Wed Apr 6 11:29:42 2011

Asterisk developer's documentation


chan_mgcp.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2006, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief Implementation of Media Gateway Control Protocol
00022  *
00023  * \author Mark Spencer <markster@digium.com>
00024  *
00025  * \par See also
00026  * \arg \ref Config_mgcp
00027  * \arg \ref res_pktccops
00028  *
00029  * \ingroup channel_drivers
00030  */
00031 
00032 /*** MODULEINFO
00033         <use>res_pktccops</use>
00034  ***/
00035 
00036 #include "asterisk.h"
00037 
00038 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 286931 $")
00039 
00040 #include <sys/socket.h>
00041 #include <sys/ioctl.h>
00042 #include <net/if.h>
00043 #include <fcntl.h>
00044 #include <netdb.h>
00045 #include <sys/signal.h>
00046 #include <signal.h>
00047 #include <netinet/in.h>
00048 #include <netinet/in_systm.h>
00049 #include <netinet/ip.h>
00050 #include <arpa/inet.h>
00051 #include <ctype.h>
00052 
00053 #include "asterisk/lock.h"
00054 #include "asterisk/channel.h"
00055 #include "asterisk/config.h"
00056 #include "asterisk/module.h"
00057 #include "asterisk/pbx.h"
00058 #include "asterisk/sched.h"
00059 #include "asterisk/io.h"
00060 #include "asterisk/rtp_engine.h"
00061 #include "asterisk/acl.h"
00062 #include "asterisk/callerid.h"
00063 #include "asterisk/cli.h"
00064 #include "asterisk/say.h"
00065 #include "asterisk/cdr.h"
00066 #include "asterisk/astdb.h"
00067 #include "asterisk/features.h"
00068 #include "asterisk/app.h"
00069 #include "asterisk/musiconhold.h"
00070 #include "asterisk/utils.h"
00071 #include "asterisk/netsock.h"
00072 #include "asterisk/causes.h"
00073 #include "asterisk/dsp.h"
00074 #include "asterisk/devicestate.h"
00075 #include "asterisk/stringfields.h"
00076 #include "asterisk/abstract_jb.h"
00077 #include "asterisk/event.h"
00078 #include "asterisk/chanvars.h"
00079 #include "asterisk/pktccops.h"
00080 
00081 /*
00082  * Define to work around buggy dlink MGCP phone firmware which
00083  * appears not to know that "rt" is part of the "G" package.
00084  */
00085 /* #define DLINK_BUGGY_FIRMWARE  */
00086 
00087 #define MGCPDUMPER
00088 #define DEFAULT_EXPIRY  120
00089 #define MAX_EXPIRY   3600
00090 #define DIRECTMEDIA  1
00091 
00092 #ifndef INADDR_NONE
00093 #define INADDR_NONE (in_addr_t)(-1)
00094 #endif
00095 
00096 /*! Global jitterbuffer configuration - by default, jb is disabled */
00097 static struct ast_jb_conf default_jbconf =
00098 {
00099    .flags = 0,
00100    .max_size = -1,
00101    .resync_threshold = -1,
00102    .impl = "",
00103    .target_extra = -1,
00104 };
00105 static struct ast_jb_conf global_jbconf;
00106 
00107 static const char tdesc[] = "Media Gateway Control Protocol (MGCP)";
00108 static const char config[] = "mgcp.conf";
00109 
00110 #define MGCP_DTMF_RFC2833  (1 << 0)
00111 #define MGCP_DTMF_INBAND   (1 << 1)
00112 #define MGCP_DTMF_HYBRID   (1 << 2)
00113 
00114 #define DEFAULT_MGCP_GW_PORT  2427 /*!< From RFC 2705 */
00115 #define DEFAULT_MGCP_CA_PORT  2727 /*!< From RFC 2705 */
00116 #define MGCP_MAX_PACKET    1500 /*!< Also from RFC 2543, should sub headers tho */
00117 #define DEFAULT_RETRANS    1000 /*!< How frequently to retransmit */
00118 #define MAX_RETRANS     5    /*!< Try only 5 times for retransmissions */
00119 
00120 /*! MGCP rtp stream modes { */
00121 #define MGCP_CX_SENDONLY   0
00122 #define MGCP_CX_RECVONLY   1
00123 #define MGCP_CX_SENDRECV   2
00124 #define MGCP_CX_CONF    3
00125 #define MGCP_CX_CONFERENCE 3
00126 #define MGCP_CX_MUTE    4
00127 #define MGCP_CX_INACTIVE   4
00128 /*! } */
00129 
00130 static const char * const mgcp_cxmodes[] = {
00131    "sendonly",
00132    "recvonly",
00133    "sendrecv",
00134    "confrnce",
00135    "inactive"
00136 };
00137 
00138 enum {
00139    MGCP_CMD_EPCF,
00140    MGCP_CMD_CRCX,
00141    MGCP_CMD_MDCX,
00142    MGCP_CMD_DLCX,
00143    MGCP_CMD_RQNT,
00144    MGCP_CMD_NTFY,
00145    MGCP_CMD_AUEP,
00146    MGCP_CMD_AUCX,
00147    MGCP_CMD_RSIP
00148 };
00149 
00150 static char context[AST_MAX_EXTENSION] = "default";
00151 
00152 static char language[MAX_LANGUAGE] = "";
00153 static char musicclass[MAX_MUSICCLASS] = "";
00154 static char parkinglot[AST_MAX_CONTEXT];
00155 static char cid_num[AST_MAX_EXTENSION] = "";
00156 static char cid_name[AST_MAX_EXTENSION] = "";
00157 
00158 static int dtmfmode = 0;
00159 static int nat = 0;
00160 static int ncs = 0;
00161 static int pktcgatealloc = 0;
00162 static int hangupongateremove = 0;
00163 
00164 static ast_group_t cur_callergroup = 0;
00165 static ast_group_t cur_pickupgroup = 0;
00166 
00167 static struct {
00168    unsigned int tos;
00169    unsigned int tos_audio;
00170    unsigned int cos;
00171    unsigned int cos_audio;
00172 } qos = { 0, 0, 0, 0 };
00173 
00174 static int immediate = 0;
00175 
00176 static int callwaiting = 0;
00177 
00178 static int callreturn = 0;
00179 
00180 static int slowsequence = 0;
00181 
00182 static int threewaycalling = 0;
00183 
00184 /*! This is for flashhook transfers */
00185 static int transfer = 0;
00186 
00187 static int cancallforward = 0;
00188 
00189 static int singlepath = 0;
00190 
00191 static int directmedia = DIRECTMEDIA;
00192 
00193 static char accountcode[AST_MAX_ACCOUNT_CODE] = "";
00194 
00195 static char mailbox[AST_MAX_EXTENSION];
00196 
00197 static int amaflags = 0;
00198 
00199 static int adsi = 0;
00200 
00201 static unsigned int oseq;
00202 
00203 /*! Wait up to 16 seconds for first digit (FXO logic) */
00204 static int firstdigittimeout = 16000;
00205 
00206 /*! How long to wait for following digits (FXO logic) */
00207 static int gendigittimeout = 8000;
00208 
00209 /*! How long to wait for an extra digit, if there is an ambiguous match */
00210 static int matchdigittimeout = 3000;
00211 
00212 /*! Protect the monitoring thread, so only one process can kill or start it, and not
00213     when it's doing something critical. */
00214 AST_MUTEX_DEFINE_STATIC(netlock);
00215 
00216 AST_MUTEX_DEFINE_STATIC(monlock);
00217 
00218 /*! This is the thread for the monitor which checks for input on the channels
00219  *  which are not currently in use.
00220  */
00221 static pthread_t monitor_thread = AST_PTHREADT_NULL;
00222 
00223 static int restart_monitor(void);
00224 
00225 static format_t capability = AST_FORMAT_ULAW;
00226 static int nonCodecCapability = AST_RTP_DTMF;
00227 
00228 static char ourhost[MAXHOSTNAMELEN];
00229 static struct in_addr __ourip;
00230 static int ourport;
00231 
00232 static int mgcpdebug = 0;
00233 
00234 static struct sched_context *sched;
00235 static struct io_context *io;
00236 /*! The private structures of the mgcp channels are linked for
00237  * selecting outgoing channels
00238  */
00239 
00240 #define MGCP_MAX_HEADERS   64
00241 #define MGCP_MAX_LINES     64
00242 
00243 struct mgcp_request {
00244    int len;
00245    char *verb;
00246    char *identifier;
00247    char *endpoint;
00248    char *version;
00249    int headers;         /*!< MGCP Headers */
00250    char *header[MGCP_MAX_HEADERS];
00251    int lines;        /*!< SDP Content */
00252    char *line[MGCP_MAX_LINES];
00253    char data[MGCP_MAX_PACKET];
00254    int cmd;                        /*!< int version of verb = command */
00255    unsigned int trid;              /*!< int version of identifier = transaction id */
00256    struct mgcp_request *next;      /*!< next in the queue */
00257 };
00258 
00259 /*! \brief mgcp_message: MGCP message for queuing up */
00260 struct mgcp_message {
00261    struct mgcp_endpoint *owner_ep;
00262    struct mgcp_subchannel *owner_sub;
00263    int retrans;
00264    unsigned long expire;
00265    unsigned int seqno;
00266    int len;
00267    struct mgcp_message *next;
00268    char buf[0];
00269 };
00270 
00271 #define RESPONSE_TIMEOUT 30   /*!< in seconds */
00272 
00273 struct mgcp_response {
00274    time_t whensent;
00275    int len;
00276    int seqno;
00277    struct mgcp_response *next;
00278    char buf[0];
00279 };
00280 
00281 #define MAX_SUBS 2
00282 
00283 #define SUB_REAL 0
00284 #define SUB_ALT  1
00285 
00286 struct mgcp_subchannel {
00287    /*! subchannel magic string.
00288       Needed to prove that any subchannel pointer passed by asterisk
00289       really points to a valid subchannel memory area.
00290       Ugly.. But serves the purpose for the time being.
00291     */
00292 #define MGCP_SUBCHANNEL_MAGIC "!978!"
00293    char magic[6];
00294    ast_mutex_t lock;
00295    int id;
00296    struct ast_channel *owner;
00297    struct mgcp_endpoint *parent;
00298    struct ast_rtp_instance *rtp;
00299    struct sockaddr_in tmpdest;
00300    char txident[80]; /*! \todo FIXME txident is replaced by rqnt_ident in endpoint.
00301          This should be obsoleted */
00302    char cxident[80];
00303    char callid[80];
00304    int cxmode;
00305    struct mgcp_request *cx_queue; /*!< pending CX commands */
00306    ast_mutex_t cx_queue_lock;     /*!< CX queue lock */
00307    int nat;
00308    int iseq;                      /*!< Not used? RTP? */
00309    int outgoing;
00310    int alreadygone;
00311    int sdpsent;
00312    struct cops_gate *gate;
00313    struct mgcp_subchannel *next;  /*!< for out circular linked list */
00314 };
00315 
00316 #define MGCP_ONHOOK  1
00317 #define MGCP_OFFHOOK 2
00318 
00319 #define TYPE_TRUNK 1
00320 #define TYPE_LINE  2
00321 
00322 struct mgcp_endpoint {
00323    ast_mutex_t lock;
00324    char name[80];
00325    struct mgcp_subchannel *sub;     /*!< Pointer to our current connection, channel and stuff */
00326    char accountcode[AST_MAX_ACCOUNT_CODE];
00327    char exten[AST_MAX_EXTENSION];      /*!< Extention where to start */
00328    char context[AST_MAX_EXTENSION];
00329    char language[MAX_LANGUAGE];
00330    char cid_num[AST_MAX_EXTENSION]; /*!< Caller*ID number */
00331    char cid_name[AST_MAX_EXTENSION];   /*!< Caller*ID name */
00332    char lastcallerid[AST_MAX_EXTENSION];  /*!< Last Caller*ID */
00333    char dtmf_buf[AST_MAX_EXTENSION];   /*!< place to collect digits be */
00334    char call_forward[AST_MAX_EXTENSION];  /*!< Last Caller*ID */
00335    char musicclass[MAX_MUSICCLASS];
00336    char curtone[80];       /*!< Current tone */
00337    char mailbox[AST_MAX_EXTENSION];
00338    char parkinglot[AST_MAX_CONTEXT];   /*!< Parkinglot */
00339    struct ast_event_sub *mwi_event_sub;
00340    ast_group_t callgroup;
00341    ast_group_t pickupgroup;
00342    int callwaiting;
00343    int hascallwaiting;
00344    int transfer;
00345    int threewaycalling;
00346    int singlepath;
00347    int cancallforward;
00348    int directmedia;
00349    int callreturn;
00350    int dnd; /* How does this affect callwait? Do we just deny a mgcp_request if we're dnd? */
00351    int hascallerid;
00352    int hidecallerid;
00353    int dtmfmode;
00354    int amaflags;
00355    int ncs;
00356    int pktcgatealloc;
00357    int hangupongateremove;
00358    int type;
00359    int slowsequence;       /*!< MS: Sequence the endpoint as a whole */
00360    int group;
00361    int iseq; /*!< Not used? */
00362    int lastout; /*!< tracking this on the subchannels.  Is it needed here? */
00363    int needdestroy; /*!< Not used? */
00364    format_t capability;
00365    int nonCodecCapability;
00366    int onhooktime;
00367    int msgstate; /*!< voicemail message state */
00368    int immediate;
00369    int hookstate;
00370    int adsi;
00371    char rqnt_ident[80];             /*!< request identifier */
00372    struct mgcp_request *rqnt_queue; /*!< pending RQNT commands */
00373    ast_mutex_t rqnt_queue_lock;
00374    struct mgcp_request *cmd_queue;  /*!< pending commands other than RQNT */
00375    ast_mutex_t cmd_queue_lock;
00376    int delme;                       /*!< needed for reload */
00377    int needaudit;                   /*!< needed for reload */
00378    struct ast_dsp *dsp; /*!< XXX Should there be a dsp/subchannel? XXX */
00379    /* owner is tracked on the subchannels, and the *sub indicates whos in charge */
00380    /* struct ast_channel *owner; */
00381    /* struct ast_rtp *rtp; */
00382    /* struct sockaddr_in tmpdest; */
00383    /* message go the the endpoint and not the channel so they stay here */
00384    struct ast_variable *chanvars;      /*!< Variables to set for channel created by user */
00385    struct mgcp_endpoint *next;
00386    struct mgcp_gateway *parent;
00387 };
00388 
00389 static struct mgcp_gateway {
00390    /* A gateway containing one or more endpoints */
00391    char name[80];
00392    int isnamedottedip; /*!< is the name FQDN or dotted ip */
00393    struct sockaddr_in addr;
00394    struct sockaddr_in defaddr;
00395    struct in_addr ourip;
00396    int dynamic;
00397    int expire;    /*!< XXX Should we ever expire dynamic registrations? XXX */
00398    struct mgcp_endpoint *endpoints;
00399    struct ast_ha *ha;
00400 /* obsolete
00401    time_t lastouttime;
00402    int lastout;
00403    int messagepending;
00404 */
00405 /* Wildcard endpoint name */
00406    char wcardep[30];
00407    struct mgcp_message *msgs; /*!< gw msg queue */
00408    ast_mutex_t msgs_lock;     /*!< queue lock */
00409    int retransid;             /*!< retrans timer id */
00410    int delme;                 /*!< needed for reload */
00411    int realtime;
00412    struct mgcp_response *responses;
00413    struct mgcp_gateway *next;
00414 } *gateways = NULL;
00415 
00416 AST_MUTEX_DEFINE_STATIC(mgcp_reload_lock);
00417 static int mgcp_reloading = 0;
00418 
00419 /*! \brief gatelock: mutex for gateway/endpoint lists */
00420 AST_MUTEX_DEFINE_STATIC(gatelock);
00421 
00422 static int mgcpsock  = -1;
00423 
00424 static struct sockaddr_in bindaddr;
00425 
00426 static struct ast_frame  *mgcp_read(struct ast_channel *ast);
00427 static int transmit_response(struct mgcp_subchannel *sub, char *msg, struct mgcp_request *req, char *msgrest);
00428 static int transmit_notify_request(struct mgcp_subchannel *sub, char *tone);
00429 static int transmit_modify_request(struct mgcp_subchannel *sub);
00430 static int transmit_connect(struct mgcp_subchannel *sub);
00431 static int transmit_notify_request_with_callerid(struct mgcp_subchannel *sub, char *tone, char *callernum, char *callername);
00432 static int transmit_modify_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp, format_t codecs);
00433 static int transmit_connection_del(struct mgcp_subchannel *sub);
00434 static int transmit_audit_endpoint(struct mgcp_endpoint *p);
00435 static void start_rtp(struct mgcp_subchannel *sub);
00436 static void handle_response(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
00437                             int result, unsigned int ident, struct mgcp_request *resp);
00438 static void dump_cmd_queues(struct mgcp_endpoint *p, struct mgcp_subchannel *sub);
00439 static char *mgcp_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
00440 static int reload_config(int reload);
00441 
00442 static struct ast_channel *mgcp_request(const char *type, format_t format, const struct ast_channel *requestor, void *data, int *cause);
00443 static int mgcp_call(struct ast_channel *ast, char *dest, int timeout);
00444 static int mgcp_hangup(struct ast_channel *ast);
00445 static int mgcp_answer(struct ast_channel *ast);
00446 static struct ast_frame *mgcp_read(struct ast_channel *ast);
00447 static int mgcp_write(struct ast_channel *ast, struct ast_frame *frame);
00448 static int mgcp_indicate(struct ast_channel *ast, int ind, const void *data, size_t datalen);
00449 static int mgcp_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
00450 static int mgcp_senddigit_begin(struct ast_channel *ast, char digit);
00451 static int mgcp_senddigit_end(struct ast_channel *ast, char digit, unsigned int duration);
00452 static int mgcp_devicestate(void *data);
00453 static void add_header_offhook(struct mgcp_subchannel *sub, struct mgcp_request *resp, char *tone);
00454 static int transmit_connect_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp);
00455 static struct mgcp_gateway *build_gateway(char *cat, struct ast_variable *v);
00456 static int mgcp_alloc_pktcgate(struct mgcp_subchannel *sub);
00457 static int acf_channel_read(struct ast_channel *chan, const char *funcname, char *preparse, char *buf, size_t buflen);
00458 static struct ast_variable *add_var(const char *buf, struct ast_variable *list);
00459 static struct ast_variable *copy_vars(struct ast_variable *src);
00460 
00461 static const struct ast_channel_tech mgcp_tech = {
00462    .type = "MGCP",
00463    .description = tdesc,
00464    .capabilities = AST_FORMAT_ULAW | AST_FORMAT_ALAW,
00465    .properties = AST_CHAN_TP_WANTSJITTER | AST_CHAN_TP_CREATESJITTER,
00466    .requester = mgcp_request,
00467    .devicestate = mgcp_devicestate,
00468    .call = mgcp_call,
00469    .hangup = mgcp_hangup,
00470    .answer = mgcp_answer,
00471    .read = mgcp_read,
00472    .write = mgcp_write,
00473    .indicate = mgcp_indicate,
00474    .fixup = mgcp_fixup,
00475    .send_digit_begin = mgcp_senddigit_begin,
00476    .send_digit_end = mgcp_senddigit_end,
00477    .bridge = ast_rtp_instance_bridge,
00478    .func_channel_read = acf_channel_read,
00479 };
00480 
00481 static void mwi_event_cb(const struct ast_event *event, void *userdata)
00482 {
00483    /* This module does not handle MWI in an event-based manner.  However, it
00484     * subscribes to MWI for each mailbox that is configured so that the core
00485     * knows that we care about it.  Then, chan_mgcp will get the MWI from the
00486     * event cache instead of checking the mailbox directly. */
00487 }
00488 
00489 static int has_voicemail(struct mgcp_endpoint *p)
00490 {
00491    int new_msgs;
00492    struct ast_event *event;
00493    char *mbox, *cntx;
00494 
00495    cntx = mbox = ast_strdupa(p->mailbox);
00496    strsep(&cntx, "@");
00497    if (ast_strlen_zero(cntx))
00498       cntx = "default";
00499 
00500    event = ast_event_get_cached(AST_EVENT_MWI,
00501       AST_EVENT_IE_MAILBOX, AST_EVENT_IE_PLTYPE_STR, mbox,
00502       AST_EVENT_IE_CONTEXT, AST_EVENT_IE_PLTYPE_STR, cntx,
00503       AST_EVENT_IE_END);
00504 
00505    if (event) {
00506       new_msgs = ast_event_get_ie_uint(event, AST_EVENT_IE_NEWMSGS);
00507       ast_event_destroy(event);
00508    } else
00509       new_msgs = ast_app_has_voicemail(p->mailbox, NULL);
00510 
00511    return new_msgs;
00512 }
00513 
00514 static int unalloc_sub(struct mgcp_subchannel *sub)
00515 {
00516    struct mgcp_endpoint *p = sub->parent;
00517    if (p->sub == sub) {
00518       ast_log(LOG_WARNING, "Trying to unalloc the real channel %s@%s?!?\n", p->name, p->parent->name);
00519       return -1;
00520    }
00521    ast_debug(1, "Released sub %d of channel %s@%s\n", sub->id, p->name, p->parent->name);
00522 
00523    sub->owner = NULL;
00524    if (!ast_strlen_zero(sub->cxident)) {
00525       transmit_connection_del(sub);
00526    }
00527    sub->cxident[0] = '\0';
00528    sub->callid[0] = '\0';
00529    sub->cxmode = MGCP_CX_INACTIVE;
00530    sub->outgoing = 0;
00531    sub->alreadygone = 0;
00532    memset(&sub->tmpdest, 0, sizeof(sub->tmpdest));
00533    if (sub->rtp) {
00534       ast_rtp_instance_destroy(sub->rtp);
00535       sub->rtp = NULL;
00536    }
00537    dump_cmd_queues(NULL, sub);
00538    return 0;
00539 }
00540 
00541 /* modified for new transport mechanism */
00542 static int __mgcp_xmit(struct mgcp_gateway *gw, char *data, int len)
00543 {
00544    int res;
00545    if (gw->addr.sin_addr.s_addr)
00546       res=sendto(mgcpsock, data, len, 0, (struct sockaddr *)&gw->addr, sizeof(struct sockaddr_in));
00547    else
00548       res=sendto(mgcpsock, data, len, 0, (struct sockaddr *)&gw->defaddr, sizeof(struct sockaddr_in));
00549    if (res != len) {
00550       ast_log(LOG_WARNING, "mgcp_xmit returned %d: %s\n", res, strerror(errno));
00551    }
00552    return res;
00553 }
00554 
00555 static int resend_response(struct mgcp_subchannel *sub, struct mgcp_response *resp)
00556 {
00557    struct mgcp_endpoint *p = sub->parent;
00558    int res;
00559    ast_debug(1, "Retransmitting:\n%s\n to %s:%d\n", resp->buf, ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
00560    res = __mgcp_xmit(p->parent, resp->buf, resp->len);
00561    if (res > 0)
00562       res = 0;
00563    return res;
00564 }
00565 
00566 static int send_response(struct mgcp_subchannel *sub, struct mgcp_request *req)
00567 {
00568    struct mgcp_endpoint *p = sub->parent;
00569    int res;
00570    ast_debug(1, "Transmitting:\n%s\n to %s:%d\n", req->data, ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
00571    res = __mgcp_xmit(p->parent, req->data, req->len);
00572    if (res > 0)
00573       res = 0;
00574    return res;
00575 }
00576 
00577 /* modified for new transport framework */
00578 static void dump_queue(struct mgcp_gateway *gw, struct mgcp_endpoint *p)
00579 {
00580    struct mgcp_message *cur, *q = NULL, *w, *prev;
00581 
00582    ast_mutex_lock(&gw->msgs_lock);
00583    for (prev = NULL, cur = gw->msgs; cur; prev = cur, cur = cur->next) {
00584       if (!p || cur->owner_ep == p) {
00585          if (prev) {
00586             prev->next = cur->next;
00587          } else {
00588             gw->msgs = cur->next;
00589          }
00590 
00591          ast_log(LOG_NOTICE, "Removing message from %s transaction %u\n",
00592             gw->name, cur->seqno);
00593 
00594          w = cur;
00595          if (q) {
00596             w->next = q;
00597          } else {
00598             w->next = NULL;
00599          }
00600          q = w;
00601       }
00602    }
00603    ast_mutex_unlock(&gw->msgs_lock);
00604 
00605    while (q) {
00606       cur = q;
00607       q = q->next;
00608       ast_free(cur);
00609    }
00610 }
00611 
00612 static void mgcp_queue_frame(struct mgcp_subchannel *sub, struct ast_frame *f)
00613 {
00614    for (;;) {
00615       if (sub->owner) {
00616          if (!ast_channel_trylock(sub->owner)) {
00617             ast_queue_frame(sub->owner, f);
00618             ast_channel_unlock(sub->owner);
00619             break;
00620          } else {
00621             DEADLOCK_AVOIDANCE(&sub->lock);
00622          }
00623       } else {
00624          break;
00625       }
00626    }
00627 }
00628 
00629 static void mgcp_queue_hangup(struct mgcp_subchannel *sub)
00630 {
00631    for (;;) {
00632       if (sub->owner) {
00633          if (!ast_channel_trylock(sub->owner)) {
00634             ast_queue_hangup(sub->owner);
00635             ast_channel_unlock(sub->owner);
00636             break;
00637          } else {
00638             DEADLOCK_AVOIDANCE(&sub->lock);
00639          }
00640       } else {
00641          break;
00642       }
00643    }
00644 }
00645 
00646 static void mgcp_queue_control(struct mgcp_subchannel *sub, int control)
00647 {
00648    struct ast_frame f = { AST_FRAME_CONTROL, { control } };
00649    return mgcp_queue_frame(sub, &f);
00650 }
00651 
00652 static int retrans_pkt(const void *data)
00653 {
00654    struct mgcp_gateway *gw = (struct mgcp_gateway *)data;
00655    struct mgcp_message *cur, *exq = NULL, *w, *prev;
00656    int res = 0;
00657 
00658    /* find out expired msgs */
00659    ast_mutex_lock(&gw->msgs_lock);
00660 
00661    for (prev = NULL, cur = gw->msgs; cur; prev = cur, cur = cur->next) {
00662       if (cur->retrans < MAX_RETRANS) {
00663          cur->retrans++;
00664          ast_debug(1, "Retransmitting #%d transaction %u on [%s]\n",
00665             cur->retrans, cur->seqno, gw->name);
00666          __mgcp_xmit(gw, cur->buf, cur->len);
00667       } else {
00668          if (prev)
00669             prev->next = cur->next;
00670          else
00671             gw->msgs = cur->next;
00672 
00673          ast_log(LOG_WARNING, "Maximum retries exceeded for transaction %u on [%s]\n",
00674             cur->seqno, gw->name);
00675 
00676          w = cur;
00677 
00678          if (exq) {
00679             w->next = exq;
00680          } else {
00681             w->next = NULL;
00682          }
00683          exq = w;
00684       }
00685    }
00686 
00687    if (!gw->msgs) {
00688       gw->retransid = -1;
00689       res = 0;
00690    } else {
00691       res = 1;
00692    }
00693    ast_mutex_unlock(&gw->msgs_lock);
00694 
00695    while (exq) {
00696       cur = exq;
00697       /* time-out transaction */
00698       handle_response(cur->owner_ep, cur->owner_sub, 406, cur->seqno, NULL);
00699       exq = exq->next;
00700       ast_free(cur);
00701    }
00702 
00703    return res;
00704 }
00705 
00706 /* modified for the new transaction mechanism */
00707 static int mgcp_postrequest(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
00708                             char *data, int len, unsigned int seqno)
00709 {
00710    struct mgcp_message *msg;
00711    struct mgcp_message *cur;
00712    struct mgcp_gateway *gw;
00713    struct timeval now;
00714 
00715    if (!(msg = ast_malloc(sizeof(*msg) + len))) {
00716       return -1;
00717    }
00718    if (!(gw = ((p && p->parent) ? p->parent : NULL))) {
00719       ast_free(msg);
00720       return -1;
00721    }
00722 
00723    msg->owner_sub = sub;
00724    msg->owner_ep = p;
00725    msg->seqno = seqno;
00726    msg->next = NULL;
00727    msg->len = len;
00728    msg->retrans = 0;
00729    memcpy(msg->buf, data, msg->len);
00730 
00731    ast_mutex_lock(&gw->msgs_lock);
00732    for (cur = gw->msgs; cur && cur->next; cur = cur->next);
00733    if (cur) {
00734       cur->next = msg;
00735    } else {
00736       gw->msgs = msg;
00737    }
00738 
00739    now = ast_tvnow();
00740    msg->expire = now.tv_sec * 1000 + now.tv_usec / 1000 + DEFAULT_RETRANS;
00741 
00742    if (gw->retransid == -1)
00743       gw->retransid = ast_sched_add(sched, DEFAULT_RETRANS, retrans_pkt, (void *)gw);
00744    ast_mutex_unlock(&gw->msgs_lock);
00745    __mgcp_xmit(gw, msg->buf, msg->len);
00746    /* XXX Should schedule retransmission XXX */
00747    return 0;
00748 }
00749 
00750 /* modified for new transport */
00751 static int send_request(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
00752                         struct mgcp_request *req, unsigned int seqno)
00753 {
00754    int res = 0;
00755    struct mgcp_request **queue, *q, *r, *t;
00756    ast_mutex_t *l;
00757 
00758    ast_debug(1, "Slow sequence is %d\n", p->slowsequence);
00759    if (p->slowsequence) {
00760       queue = &p->cmd_queue;
00761       l = &p->cmd_queue_lock;
00762       ast_mutex_lock(l);
00763    } else {
00764       switch (req->cmd) {
00765       case MGCP_CMD_DLCX:
00766          queue = &sub->cx_queue;
00767          l = &sub->cx_queue_lock;
00768          ast_mutex_lock(l);
00769          q = sub->cx_queue;
00770          /* delete pending cx cmds */
00771          /* buggy sb5120 */
00772          if (!sub->parent->ncs) {
00773             while (q) {
00774                r = q->next;
00775                ast_free(q);
00776                q = r;
00777             }
00778             *queue = NULL;
00779          }
00780          break;
00781 
00782       case MGCP_CMD_CRCX:
00783       case MGCP_CMD_MDCX:
00784          queue = &sub->cx_queue;
00785          l = &sub->cx_queue_lock;
00786          ast_mutex_lock(l);
00787          break;
00788 
00789       case MGCP_CMD_RQNT:
00790          queue = &p->rqnt_queue;
00791          l = &p->rqnt_queue_lock;
00792          ast_mutex_lock(l);
00793          break;
00794 
00795       default:
00796          queue = &p->cmd_queue;
00797          l = &p->cmd_queue_lock;
00798          ast_mutex_lock(l);
00799          break;
00800       }
00801    }
00802 
00803    if (!(r = ast_malloc(sizeof(*r)))) {
00804       ast_log(LOG_WARNING, "Cannot post MGCP request: insufficient memory\n");
00805       ast_mutex_unlock(l);
00806       return -1;
00807    }
00808    memcpy(r, req, sizeof(*r));
00809 
00810    if (!(*queue)) {
00811       ast_debug(1, "Posting Request:\n%s to %s:%d\n", req->data,
00812          ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
00813 
00814       res = mgcp_postrequest(p, sub, req->data, req->len, seqno);
00815    } else {
00816       ast_debug(1, "Queueing Request:\n%s to %s:%d\n", req->data,
00817          ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
00818    }
00819 
00820    /* XXX find tail. We could also keep tail in the data struct for faster access */
00821    for (t = *queue; t && t->next; t = t->next);
00822 
00823    r->next = NULL;
00824    if (t)
00825       t->next = r;
00826    else
00827       *queue = r;
00828 
00829    ast_mutex_unlock(l);
00830 
00831    return res;
00832 }
00833 
00834 static int mgcp_call(struct ast_channel *ast, char *dest, int timeout)
00835 {
00836    int res;
00837    struct mgcp_endpoint *p;
00838    struct mgcp_subchannel *sub;
00839    char tone[50] = "";
00840    const char *distinctive_ring = NULL;
00841    struct varshead *headp;
00842    struct ast_var_t *current;
00843 
00844    ast_debug(3, "MGCP mgcp_call(%s)\n", ast->name);
00845    sub = ast->tech_pvt;
00846    p = sub->parent;
00847    headp = &ast->varshead;
00848    AST_LIST_TRAVERSE(headp,current,entries) {
00849       /* Check whether there is an ALERT_INFO variable */
00850       if (strcasecmp(ast_var_name(current),"ALERT_INFO") == 0) {
00851          distinctive_ring = ast_var_value(current);
00852       }
00853    }
00854 
00855    ast_mutex_lock(&sub->lock);
00856    switch (p->hookstate) {
00857    case MGCP_OFFHOOK:
00858       if (!ast_strlen_zero(distinctive_ring)) {
00859          snprintf(tone, sizeof(tone), "L/wt%s", distinctive_ring);
00860          ast_debug(3, "MGCP distinctive callwait %s\n", tone);
00861       } else {
00862          ast_copy_string(tone, (p->ncs ? "L/wt1" : "L/wt"), sizeof(tone));
00863          ast_debug(3, "MGCP normal callwait %s\n", tone);
00864       }
00865       break;
00866    case MGCP_ONHOOK:
00867    default:
00868       if (!ast_strlen_zero(distinctive_ring)) {
00869          snprintf(tone, sizeof(tone), "L/r%s", distinctive_ring);
00870          ast_debug(3, "MGCP distinctive ring %s\n", tone);
00871       } else {
00872          ast_copy_string(tone, "L/rg", sizeof(tone));
00873          ast_debug(3, "MGCP default ring\n");
00874       }
00875       break;
00876    }
00877 
00878    if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
00879       ast_log(LOG_WARNING, "mgcp_call called on %s, neither down nor reserved\n", ast->name);
00880       ast_mutex_unlock(&sub->lock);
00881       return -1;
00882    }
00883 
00884    res = 0;
00885    sub->outgoing = 1;
00886    sub->cxmode = MGCP_CX_RECVONLY;
00887    ast_setstate(ast, AST_STATE_RINGING);
00888    if (p->type == TYPE_LINE) {
00889       if (!sub->rtp) {
00890          start_rtp(sub);
00891       } else {
00892          transmit_modify_request(sub);
00893       }
00894 
00895       if (sub->next->owner && !ast_strlen_zero(sub->next->cxident) && !ast_strlen_zero(sub->next->callid)) {
00896          /* try to prevent a callwait from disturbing the other connection */
00897          sub->next->cxmode = MGCP_CX_RECVONLY;
00898          transmit_modify_request(sub->next);
00899       }
00900 
00901       transmit_notify_request_with_callerid(sub, tone,
00902          S_COR(ast->connected.id.number.valid, ast->connected.id.number.str, ""),
00903          S_COR(ast->connected.id.name.valid, ast->connected.id.name.str, ""));
00904       ast_setstate(ast, AST_STATE_RINGING);
00905 
00906       if (sub->next->owner && !ast_strlen_zero(sub->next->cxident) && !ast_strlen_zero(sub->next->callid)) {
00907          /* Put the connection back in sendrecv */
00908          sub->next->cxmode = MGCP_CX_SENDRECV;
00909          transmit_modify_request(sub->next);
00910       }
00911    } else {
00912       ast_log(LOG_NOTICE, "Don't know how to dial on trunks yet\n");
00913       res = -1;
00914    }
00915    ast_mutex_unlock(&sub->lock);
00916    return res;
00917 }
00918 
00919 static int mgcp_hangup(struct ast_channel *ast)
00920 {
00921    struct mgcp_subchannel *sub = ast->tech_pvt;
00922    struct mgcp_endpoint *p = sub->parent;
00923    struct ast_channel *bridged;
00924 
00925    ast_debug(1, "mgcp_hangup(%s)\n", ast->name);
00926    if (!ast->tech_pvt) {
00927       ast_debug(1, "Asked to hangup channel not connected\n");
00928       return 0;
00929    }
00930    if (strcmp(sub->magic, MGCP_SUBCHANNEL_MAGIC)) {
00931       ast_debug(1, "Invalid magic. MGCP subchannel freed up already.\n");
00932       return 0;
00933    }
00934    ast_mutex_lock(&sub->lock);
00935    ast_debug(3, "MGCP mgcp_hangup(%s) on %s@%s\n", ast->name, p->name, p->parent->name);
00936 
00937    if ((p->dtmfmode & MGCP_DTMF_INBAND) && p->dsp) {
00938       /* check whether other channel is active. */
00939       if (!sub->next->owner) {
00940          if (p->dtmfmode & MGCP_DTMF_HYBRID) {
00941             p->dtmfmode &= ~MGCP_DTMF_INBAND;
00942          }
00943          ast_debug(2, "MGCP free dsp on %s@%s\n", p->name, p->parent->name);
00944          ast_dsp_free(p->dsp);
00945          p->dsp = NULL;
00946       }
00947    }
00948 
00949    sub->owner = NULL;
00950 
00951    /* for deleting gate */
00952    if (p->pktcgatealloc && sub->gate) {
00953       sub->gate->gate_open = NULL;
00954       sub->gate->gate_remove = NULL;
00955       sub->gate->got_dq_gi = NULL;
00956       sub->gate->tech_pvt = NULL;
00957       if (sub->gate->state == GATE_ALLOC_PROGRESS || sub->gate->state == GATE_ALLOCATED) {
00958          ast_pktccops_gate_alloc(GATE_DEL, sub->gate, 0, 0, 0, 0, 0, 0, NULL, NULL);
00959       } else {
00960          sub->gate->deltimer = time(NULL) + 5;
00961       }
00962       sub->gate = NULL;
00963    }
00964 
00965    if (!ast_strlen_zero(sub->cxident)) {
00966       transmit_connection_del(sub);
00967    }
00968    sub->cxident[0] = '\0';
00969    if ((sub == p->sub) && sub->next->owner) {
00970       if (p->hookstate == MGCP_OFFHOOK) {
00971          if (sub->next->owner && ast_bridged_channel(sub->next->owner)) {
00972             /* ncs fix! */
00973             bridged = ast_bridged_channel(sub->next->owner);
00974             transmit_notify_request_with_callerid(p->sub, (p->ncs ? "L/wt1" : "L/wt"),
00975                S_COR(bridged->caller.id.number.valid, bridged->caller.id.number.str, ""),
00976                S_COR(bridged->caller.id.name.valid, bridged->caller.id.name.str, ""));
00977          }
00978       } else {
00979          /* set our other connection as the primary and swith over to it */
00980          p->sub = sub->next;
00981          p->sub->cxmode = MGCP_CX_RECVONLY;
00982          transmit_modify_request(p->sub);
00983          if (sub->next->owner && ast_bridged_channel(sub->next->owner)) {
00984             bridged = ast_bridged_channel(sub->next->owner);
00985             transmit_notify_request_with_callerid(p->sub, "L/rg",
00986                S_COR(bridged->caller.id.number.valid, bridged->caller.id.number.str, ""),
00987                S_COR(bridged->caller.id.name.valid, bridged->caller.id.name.str, ""));
00988          }
00989       }
00990 
00991    } else if ((sub == p->sub->next) && p->hookstate == MGCP_OFFHOOK) {
00992       transmit_notify_request(sub, p->ncs ? "" : "L/v");
00993    } else if (p->hookstate == MGCP_OFFHOOK) {
00994       transmit_notify_request(sub, "L/ro");
00995    } else {
00996       transmit_notify_request(sub, "");
00997    }
00998 
00999    ast->tech_pvt = NULL;
01000    sub->alreadygone = 0;
01001    sub->outgoing = 0;
01002    sub->cxmode = MGCP_CX_INACTIVE;
01003    sub->callid[0] = '\0';
01004    if (p) {
01005       memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
01006    }
01007    /* Reset temporary destination */
01008    memset(&sub->tmpdest, 0, sizeof(sub->tmpdest));
01009    if (sub->rtp) {
01010       ast_rtp_instance_destroy(sub->rtp);
01011       sub->rtp = NULL;
01012    }
01013 
01014    ast_module_unref(ast_module_info->self);
01015 
01016    if ((p->hookstate == MGCP_ONHOOK) && (!sub->next->rtp)) {
01017       p->hidecallerid = 0;
01018       if (p->hascallwaiting && !p->callwaiting) {
01019          ast_verb(3, "Enabling call waiting on %s\n", ast->name);
01020          p->callwaiting = -1;
01021       }
01022       if (has_voicemail(p)) {
01023          ast_debug(3, "MGCP mgcp_hangup(%s) on %s@%s set vmwi(+)\n",
01024             ast->name, p->name, p->parent->name);
01025          transmit_notify_request(sub, "L/vmwi(+)");
01026       } else {
01027          ast_debug(3, "MGCP mgcp_hangup(%s) on %s@%s set vmwi(-)\n",
01028             ast->name, p->name, p->parent->name);
01029          transmit_notify_request(sub, "L/vmwi(-)");
01030       }
01031    }
01032    ast_mutex_unlock(&sub->lock);
01033    return 0;
01034 }
01035 
01036 static char *handle_mgcp_show_endpoints(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
01037 {
01038    struct mgcp_gateway  *mg;
01039    struct mgcp_endpoint *me;
01040    int hasendpoints = 0;
01041    struct ast_variable * v = NULL;
01042 
01043    switch (cmd) {
01044    case CLI_INIT:
01045       e->command = "mgcp show endpoints";
01046       e->usage =
01047          "Usage: mgcp show endpoints\n"
01048          "       Lists all endpoints known to the MGCP (Media Gateway Control Protocol) subsystem.\n";
01049       return NULL;
01050    case CLI_GENERATE:
01051       return NULL;
01052    }
01053 
01054    if (a->argc != 3) {
01055       return CLI_SHOWUSAGE;
01056    }
01057    ast_mutex_lock(&gatelock);
01058    for (mg = gateways; mg; mg = mg->next) {
01059       ast_cli(a->fd, "Gateway '%s' at %s (%s%s)\n", mg->name, mg->addr.sin_addr.s_addr ? ast_inet_ntoa(mg->addr.sin_addr) : ast_inet_ntoa(mg->defaddr.sin_addr), mg->realtime ? "Realtime, " : "", mg->dynamic ? "Dynamic" : "Static");
01060       for (me = mg->endpoints; me; me = me->next) {
01061          ast_cli(a->fd, "   -- '%s@%s in '%s' is %s\n", me->name, mg->name, me->context, me->sub->owner ? "active" : "idle");
01062          if (me->chanvars) {
01063             ast_cli(a->fd, "  Variables:\n");
01064             for (v = me->chanvars ; v ; v = v->next) {
01065                ast_cli(a->fd, "    %s = '%s'\n", v->name, v->value);
01066             }
01067          }
01068          hasendpoints = 1;
01069       }
01070       if (!hasendpoints) {
01071          ast_cli(a->fd, "   << No Endpoints Defined >>     ");
01072       }
01073    }
01074    ast_mutex_unlock(&gatelock);
01075    return CLI_SUCCESS;
01076 }
01077 
01078 static char *handle_mgcp_audit_endpoint(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
01079 {
01080    struct mgcp_gateway  *mg;
01081    struct mgcp_endpoint *me;
01082    int found = 0;
01083    char *ename,*gname, *c;
01084 
01085    switch (cmd) {
01086    case CLI_INIT:
01087       e->command = "mgcp audit endpoint";
01088       e->usage =
01089          "Usage: mgcp audit endpoint <endpointid>\n"
01090          "       Lists the capabilities of an endpoint in the MGCP (Media Gateway Control Protocol) subsystem.\n"
01091          "       mgcp debug MUST be on to see the results of this command.\n";
01092       return NULL;
01093    case CLI_GENERATE:
01094       return NULL;
01095    }
01096 
01097    if (!mgcpdebug) {
01098       return CLI_SHOWUSAGE;
01099    }
01100    if (a->argc != 4)
01101       return CLI_SHOWUSAGE;
01102    /* split the name into parts by null */
01103    ename = ast_strdupa(a->argv[3]);
01104    for (gname = ename; *gname; gname++) {
01105       if (*gname == '@') {
01106          *gname = 0;
01107          gname++;
01108          break;
01109       }
01110    }
01111    if (gname[0] == '[') {
01112       gname++;
01113    }
01114    if ((c = strrchr(gname, ']'))) {
01115       *c = '\0';
01116    }
01117    ast_mutex_lock(&gatelock);
01118    for (mg = gateways; mg; mg = mg->next) {
01119       if (!strcasecmp(mg->name, gname)) {
01120          for (me = mg->endpoints; me; me = me->next) {
01121             if (!strcasecmp(me->name, ename)) {
01122                found = 1;
01123                transmit_audit_endpoint(me);
01124                break;
01125             }
01126          }
01127          if (found) {
01128             break;
01129          }
01130       }
01131    }
01132    if (!found) {
01133       ast_cli(a->fd, "   << Could not find endpoint >>     ");
01134    }
01135    ast_mutex_unlock(&gatelock);
01136    return CLI_SUCCESS;
01137 }
01138 
01139 static char *handle_mgcp_set_debug(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
01140 {
01141    switch (cmd) {
01142    case CLI_INIT:
01143       e->command = "mgcp set debug {on|off}";
01144       e->usage =
01145          "Usage: mgcp set debug {on|off}\n"
01146          "       Enables/Disables dumping of MGCP packets for debugging purposes\n";   
01147       return NULL;
01148    case CLI_GENERATE:
01149       return NULL;
01150    }
01151 
01152    if (a->argc != e->args)
01153       return CLI_SHOWUSAGE;
01154 
01155    if (!strncasecmp(a->argv[e->args - 1], "on", 2)) {
01156       mgcpdebug = 1;
01157       ast_cli(a->fd, "MGCP Debugging Enabled\n");
01158    } else if (!strncasecmp(a->argv[3], "off", 3)) {
01159       mgcpdebug = 0;
01160       ast_cli(a->fd, "MGCP Debugging Disabled\n");
01161    } else {
01162       return CLI_SHOWUSAGE;
01163    }
01164    return CLI_SUCCESS;
01165 }
01166 
01167 static struct ast_cli_entry cli_mgcp[] = {
01168    AST_CLI_DEFINE(handle_mgcp_audit_endpoint, "Audit specified MGCP endpoint"),
01169    AST_CLI_DEFINE(handle_mgcp_show_endpoints, "List defined MGCP endpoints"),
01170    AST_CLI_DEFINE(handle_mgcp_set_debug, "Enable/Disable MGCP debugging"),
01171    AST_CLI_DEFINE(mgcp_reload, "Reload MGCP configuration"),
01172 };
01173 
01174 static int mgcp_answer(struct ast_channel *ast)
01175 {
01176    int res = 0;
01177    struct mgcp_subchannel *sub = ast->tech_pvt;
01178    struct mgcp_endpoint *p = sub->parent;
01179 
01180    ast_mutex_lock(&sub->lock);
01181    sub->cxmode = MGCP_CX_SENDRECV;
01182    if (!sub->rtp) {
01183       start_rtp(sub);
01184    } else {
01185       transmit_modify_request(sub);
01186    }
01187    ast_verb(3, "MGCP mgcp_answer(%s) on %s@%s-%d\n",
01188          ast->name, p->name, p->parent->name, sub->id);
01189    if (ast->_state != AST_STATE_UP) {
01190       ast_setstate(ast, AST_STATE_UP);
01191       ast_debug(1, "mgcp_answer(%s)\n", ast->name);
01192       transmit_notify_request(sub, "");
01193       transmit_modify_request(sub);
01194    }
01195    ast_mutex_unlock(&sub->lock);
01196    return res;
01197 }
01198 
01199 static struct ast_frame *mgcp_rtp_read(struct mgcp_subchannel *sub)
01200 {
01201    /* Retrieve audio/etc from channel.  Assumes sub->lock is already held. */
01202    struct ast_frame *f;
01203 
01204    f = ast_rtp_instance_read(sub->rtp, 0);
01205    /* Don't send RFC2833 if we're not supposed to */
01206    if (f && (f->frametype == AST_FRAME_DTMF) && !(sub->parent->dtmfmode & MGCP_DTMF_RFC2833))
01207       return &ast_null_frame;
01208    if (sub->owner) {
01209       /* We already hold the channel lock */
01210       if (f->frametype == AST_FRAME_VOICE) {
01211          if (f->subclass.codec != sub->owner->nativeformats) {
01212             ast_debug(1, "Oooh, format changed to %s\n", ast_getformatname(f->subclass.codec));
01213             sub->owner->nativeformats = f->subclass.codec;
01214             ast_set_read_format(sub->owner, sub->owner->readformat);
01215             ast_set_write_format(sub->owner, sub->owner->writeformat);
01216          }
01217          /* Courtesy fearnor aka alex@pilosoft.com */
01218          if ((sub->parent->dtmfmode & MGCP_DTMF_INBAND) && (sub->parent->dsp)) {
01219 #if 0
01220             ast_log(LOG_NOTICE, "MGCP ast_dsp_process\n");
01221 #endif
01222             f = ast_dsp_process(sub->owner, sub->parent->dsp, f);
01223          }
01224       }
01225    }
01226    return f;
01227 }
01228 
01229 
01230 static struct ast_frame *mgcp_read(struct ast_channel *ast)
01231 {
01232    struct ast_frame *f;
01233    struct mgcp_subchannel *sub = ast->tech_pvt;
01234    ast_mutex_lock(&sub->lock);
01235    f = mgcp_rtp_read(sub);
01236    ast_mutex_unlock(&sub->lock);
01237    return f;
01238 }
01239 
01240 static int mgcp_write(struct ast_channel *ast, struct ast_frame *frame)
01241 {
01242    struct mgcp_subchannel *sub = ast->tech_pvt;
01243    int res = 0;
01244    char buf[256];
01245 
01246    if (frame->frametype != AST_FRAME_VOICE) {
01247       if (frame->frametype == AST_FRAME_IMAGE)
01248          return 0;
01249       else {
01250          ast_log(LOG_WARNING, "Can't send %d type frames with MGCP write\n", frame->frametype);
01251          return 0;
01252       }
01253    } else {
01254       if (!(frame->subclass.codec & ast->nativeformats)) {
01255          ast_log(LOG_WARNING, "Asked to transmit frame type %s, while native formats is %s (read/write = %s/%s)\n",
01256             ast_getformatname(frame->subclass.codec),
01257             ast_getformatname_multiple(buf, sizeof(buf), ast->nativeformats),
01258             ast_getformatname(ast->readformat),
01259             ast_getformatname(ast->writeformat));
01260          /* return -1; */
01261       }
01262    }
01263    if (sub) {
01264       ast_mutex_lock(&sub->lock);
01265       if (!sub->sdpsent && sub->gate) {
01266          if (sub->gate->state == GATE_ALLOCATED) {
01267             ast_debug(1, "GATE ALLOCATED, sending sdp\n");
01268             transmit_modify_with_sdp(sub, NULL, 0);
01269          }
01270       }
01271       if ((sub->parent->sub == sub) || !sub->parent->singlepath) {
01272          if (sub->rtp) {
01273             res =  ast_rtp_instance_write(sub->rtp, frame);
01274          }
01275       }
01276       ast_mutex_unlock(&sub->lock);
01277    }
01278    return res;
01279 }
01280 
01281 static int mgcp_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
01282 {
01283    struct mgcp_subchannel *sub = newchan->tech_pvt;
01284 
01285    ast_mutex_lock(&sub->lock);
01286    ast_log(LOG_NOTICE, "mgcp_fixup(%s, %s)\n", oldchan->name, newchan->name);
01287    if (sub->owner != oldchan) {
01288       ast_mutex_unlock(&sub->lock);
01289       ast_log(LOG_WARNING, "old channel wasn't %p but was %p\n", oldchan, sub->owner);
01290       return -1;
01291    }
01292    sub->owner = newchan;
01293    ast_mutex_unlock(&sub->lock);
01294    return 0;
01295 }
01296 
01297 static int mgcp_senddigit_begin(struct ast_channel *ast, char digit)
01298 {
01299    struct mgcp_subchannel *sub = ast->tech_pvt;
01300    struct mgcp_endpoint *p = sub->parent;
01301    int res = 0;
01302 
01303    ast_mutex_lock(&sub->lock);
01304    if (p->dtmfmode & MGCP_DTMF_INBAND || p->dtmfmode & MGCP_DTMF_HYBRID) {
01305       ast_debug(1, "Sending DTMF using inband/hybrid\n");
01306       res = -1; /* Let asterisk play inband indications */
01307    } else if (p->dtmfmode & MGCP_DTMF_RFC2833) {
01308       ast_debug(1, "Sending DTMF using RFC2833");
01309       ast_rtp_instance_dtmf_begin(sub->rtp, digit);
01310    } else {
01311       ast_log(LOG_ERROR, "Don't know about DTMF_MODE %d\n", p->dtmfmode);
01312    }
01313    ast_mutex_unlock(&sub->lock);
01314 
01315    return res;
01316 }
01317 
01318 static int mgcp_senddigit_end(struct ast_channel *ast, char digit, unsigned int duration)
01319 {
01320    struct mgcp_subchannel *sub = ast->tech_pvt;
01321    struct mgcp_endpoint *p = sub->parent;
01322    int res = 0;
01323    char tmp[4];
01324 
01325    ast_mutex_lock(&sub->lock);
01326    if (p->dtmfmode & MGCP_DTMF_INBAND || p->dtmfmode & MGCP_DTMF_HYBRID) {
01327       ast_debug(1, "Stopping DTMF using inband/hybrid\n");
01328       res = -1; /* Tell Asterisk to stop inband indications */
01329    } else if (p->dtmfmode & MGCP_DTMF_RFC2833) {
01330       ast_debug(1, "Stopping DTMF using RFC2833\n");
01331       if (sub->parent->ncs) {
01332          tmp[0] = digit;
01333          tmp[1] = '\0';
01334       } else {
01335          tmp[0] = 'D';
01336          tmp[1] = '/';
01337          tmp[2] = digit;
01338          tmp[3] = '\0';
01339       }
01340       transmit_notify_request(sub, tmp);
01341       ast_rtp_instance_dtmf_end(sub->rtp, digit);
01342    } else {
01343       ast_log(LOG_ERROR, "Don't know about DTMF_MODE %d\n", p->dtmfmode);
01344    }
01345    ast_mutex_unlock(&sub->lock);
01346 
01347    return res;
01348 }
01349 
01350 /*!
01351  *  \brief  mgcp_devicestate: channel callback for device status monitoring
01352  *  \param  data tech/resource name of MGCP device to query
01353  *
01354  * Callback for device state management in channel subsystem
01355  * to obtain device status (up/down) of a specific MGCP endpoint
01356  *
01357  *  \return device status result (from devicestate.h) AST_DEVICE_INVALID (not available) or AST_DEVICE_UNKNOWN (available but unknown state)
01358  */
01359 static int mgcp_devicestate(void *data)
01360 {
01361    struct mgcp_gateway  *g;
01362    struct mgcp_endpoint *e = NULL;
01363    char *tmp, *endpt, *gw;
01364    int ret = AST_DEVICE_INVALID;
01365 
01366    endpt = ast_strdupa(data);
01367    if ((tmp = strchr(endpt, '@'))) {
01368       *tmp++ = '\0';
01369       gw = tmp;
01370    } else
01371       goto error;
01372 
01373    ast_mutex_lock(&gatelock);
01374    for (g = gateways; g; g = g->next) {
01375       if (strcasecmp(g->name, gw) == 0) {
01376          e = g->endpoints;
01377          break;
01378       }
01379    }
01380 
01381    if (!e)
01382       goto error;
01383 
01384    for (; e; e = e->next) {
01385       if (strcasecmp(e->name, endpt) == 0) {
01386          break;
01387       }
01388    }
01389 
01390    if (!e)
01391       goto error;
01392 
01393    /*
01394     * As long as the gateway/endpoint is valid, we'll
01395     * assume that the device is available and its state
01396     * can be tracked.
01397     */
01398    ret = AST_DEVICE_UNKNOWN;
01399 
01400 error:
01401    ast_mutex_unlock(&gatelock);
01402    return ret;
01403 }
01404 
01405 static char *control2str(int ind) {
01406    switch (ind) {
01407    case AST_CONTROL_HANGUP:
01408       return "Other end has hungup";
01409    case AST_CONTROL_RING:
01410       return "Local ring";
01411    case AST_CONTROL_RINGING:
01412       return "Remote end is ringing";
01413    case AST_CONTROL_ANSWER:
01414       return "Remote end has answered";
01415    case AST_CONTROL_BUSY:
01416       return "Remote end is busy";
01417    case AST_CONTROL_TAKEOFFHOOK:
01418       return "Make it go off hook";
01419    case AST_CONTROL_OFFHOOK:
01420       return "Line is off hook";
01421    case AST_CONTROL_CONGESTION:
01422       return "Congestion (circuits busy)";
01423    case AST_CONTROL_FLASH:
01424       return "Flash hook";
01425    case AST_CONTROL_WINK:
01426       return "Wink";
01427    case AST_CONTROL_OPTION:
01428       return "Set a low-level option";
01429    case AST_CONTROL_RADIO_KEY:
01430       return "Key Radio";
01431    case AST_CONTROL_RADIO_UNKEY:
01432       return "Un-Key Radio";
01433    }
01434    return "UNKNOWN";
01435 }
01436 
01437 static int mgcp_indicate(struct ast_channel *ast, int ind, const void *data, size_t datalen)
01438 {
01439    struct mgcp_subchannel *sub = ast->tech_pvt;
01440    int res = 0;
01441 
01442    ast_debug(3, "MGCP asked to indicate %d '%s' condition on channel %s\n",
01443       ind, control2str(ind), ast->name);
01444    ast_mutex_lock(&sub->lock);
01445    switch(ind) {
01446    case AST_CONTROL_RINGING:
01447 #ifdef DLINK_BUGGY_FIRMWARE   
01448       transmit_notify_request(sub, "rt");
01449 #else
01450       if (!sub->sdpsent) { /* will hide the inband progress!!! */
01451          transmit_notify_request(sub, sub->parent->ncs ? "L/rt" : "G/rt");
01452       }
01453 #endif
01454       break;
01455    case AST_CONTROL_BUSY:
01456       transmit_notify_request(sub, "L/bz");
01457       break;
01458    case AST_CONTROL_CONGESTION:
01459       transmit_notify_request(sub, sub->parent->ncs ? "L/cg" : "G/cg");
01460       break;
01461    case AST_CONTROL_HOLD:
01462       ast_moh_start(ast, data, NULL);
01463       break;
01464    case AST_CONTROL_UNHOLD:
01465       ast_moh_stop(ast);
01466       break;
01467    case AST_CONTROL_SRCUPDATE:
01468       ast_rtp_instance_update_source(sub->rtp);
01469       break;
01470    case AST_CONTROL_SRCCHANGE:
01471       ast_rtp_instance_change_source(sub->rtp);
01472       break;
01473    case AST_CONTROL_PROGRESS:
01474    case AST_CONTROL_PROCEEDING:
01475       transmit_modify_request(sub);
01476    case -1:
01477       transmit_notify_request(sub, "");
01478       break;
01479    default:
01480       ast_log(LOG_WARNING, "Don't know how to indicate condition %d\n", ind);
01481       res = -1;
01482    }
01483    ast_mutex_unlock(&sub->lock);
01484    return res;
01485 }
01486 
01487 static struct ast_channel *mgcp_new(struct mgcp_subchannel *sub, int state, const char *linkedid)
01488 {
01489    struct ast_channel *tmp;
01490    struct ast_variable *v = NULL;
01491    struct mgcp_endpoint *i = sub->parent;
01492    int fmt;
01493 
01494    tmp = ast_channel_alloc(1, state, i->cid_num, i->cid_name, linkedid, i->accountcode, i->exten, i->context, i->amaflags, "MGCP/%s@%s-%d", i->name, i->parent->name, sub->id);
01495    if (tmp) {
01496       tmp->tech = &mgcp_tech;
01497       tmp->nativeformats = i->capability;
01498       if (!tmp->nativeformats) {
01499          tmp->nativeformats = capability;
01500       }
01501       fmt = ast_best_codec(tmp->nativeformats);
01502       if (sub->rtp) {
01503          ast_channel_set_fd(tmp, 0, ast_rtp_instance_fd(sub->rtp, 0));
01504       }
01505       if (i->dtmfmode & (MGCP_DTMF_INBAND | MGCP_DTMF_HYBRID)) {
01506          i->dsp = ast_dsp_new();
01507          ast_dsp_set_features(i->dsp, DSP_FEATURE_DIGIT_DETECT);
01508          /* this is to prevent clipping of dtmf tones during dsp processing */
01509          ast_dsp_set_digitmode(i->dsp, DSP_DIGITMODE_NOQUELCH);
01510       } else {
01511          i->dsp = NULL;
01512       }
01513       if (state == AST_STATE_RING)
01514          tmp->rings = 1;
01515       tmp->writeformat = fmt;
01516       tmp->rawwriteformat = fmt;
01517       tmp->readformat = fmt;
01518       tmp->rawreadformat = fmt;
01519       tmp->tech_pvt = sub;
01520       if (!ast_strlen_zero(i->language))
01521          ast_string_field_set(tmp, language, i->language);
01522       if (!ast_strlen_zero(i->accountcode))
01523          ast_string_field_set(tmp, accountcode, i->accountcode);
01524       if (i->amaflags)
01525          tmp->amaflags = i->amaflags;
01526       sub->owner = tmp;
01527       ast_module_ref(ast_module_info->self);
01528       tmp->callgroup = i->callgroup;
01529       tmp->pickupgroup = i->pickupgroup;
01530       ast_string_field_set(tmp, call_forward, i->call_forward);
01531       ast_copy_string(tmp->context, i->context, sizeof(tmp->context));
01532       ast_copy_string(tmp->exten, i->exten, sizeof(tmp->exten));
01533 
01534       /* Don't use ast_set_callerid() here because it will
01535        * generate a needless NewCallerID event */
01536       if (!ast_strlen_zero(i->cid_num)) {
01537          tmp->caller.ani.number.valid = 1;
01538          tmp->caller.ani.number.str = ast_strdup(i->cid_num);
01539       }
01540 
01541       if (!i->adsi) {
01542          tmp->adsicpe = AST_ADSI_UNAVAILABLE;
01543       }
01544       tmp->priority = 1;
01545 
01546       /* Set channel variables for this call from configuration */
01547       for (v = i->chanvars ; v ; v = v->next) {
01548          char valuebuf[1024];
01549          pbx_builtin_setvar_helper(tmp, v->name, ast_get_encoded_str(v->value, valuebuf, sizeof(valuebuf)));
01550       }
01551 
01552       if (sub->rtp) {
01553          ast_jb_configure(tmp, &global_jbconf);
01554       }
01555       if (state != AST_STATE_DOWN) {
01556          if (ast_pbx_start(tmp)) {
01557             ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
01558             ast_hangup(tmp);
01559             tmp = NULL;
01560          }
01561       }
01562       ast_verb(3, "MGCP mgcp_new(%s) created in state: %s\n",
01563             tmp->name, ast_state2str(state));
01564    } else {
01565       ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
01566    }
01567    return tmp;
01568 }
01569 
01570 static char *get_sdp_by_line(char* line, char *name, int nameLen)
01571 {
01572    if (strncasecmp(line, name, nameLen) == 0 && line[nameLen] == '=') {
01573       char *r = line + nameLen + 1;
01574       while (*r && (*r < 33)) ++r;
01575       return r;
01576    }
01577    return "";
01578 }
01579 
01580 static char *get_sdp(struct mgcp_request *req, char *name)
01581 {
01582    int x;
01583    int len = strlen(name);
01584    char *r;
01585 
01586    for (x = 0; x < req->lines; x++) {
01587       r = get_sdp_by_line(req->line[x], name, len);
01588       if (r[0] != '\0') return r;
01589    }
01590    return "";
01591 }
01592 
01593 static void sdpLineNum_iterator_init(int *iterator)
01594 {
01595    *iterator = 0;
01596 }
01597 
01598 static char *get_sdp_iterate(int* iterator, struct mgcp_request *req, char *name)
01599 {
01600    int len = strlen(name);
01601    char *r;
01602    while (*iterator < req->lines) {
01603       r = get_sdp_by_line(req->line[(*iterator)++], name, len);
01604       if (r[0] != '\0') return r;
01605    }
01606    return "";
01607 }
01608 
01609 static char *__get_header(struct mgcp_request *req, char *name, int *start, char *def)
01610 {
01611    int x;
01612    int len = strlen(name);
01613    char *r;
01614    for (x = *start; x < req->headers; x++) {
01615       if (!strncasecmp(req->header[x], name, len) &&
01616           (req->header[x][len] == ':')) {
01617          r = req->header[x] + len + 1;
01618          while (*r && (*r < 33)) {
01619             r++;
01620          }
01621          *start = x + 1;
01622          return r;
01623       }
01624    }
01625    /* Don't return NULL, so get_header is always a valid pointer */
01626    return def;
01627 }
01628 
01629 static char *get_header(struct mgcp_request *req, char *name)
01630 {
01631    int start = 0;
01632    return __get_header(req, name, &start, "");
01633 }
01634 
01635 /*! \brief get_csv: (SC:) get comma separated value */
01636 static char *get_csv(char *c, int *len, char **next)
01637 {
01638    char *s;
01639 
01640    *next = NULL, *len = 0;
01641    if (!c) return NULL;
01642 
01643    while (*c && (*c < 33 || *c == ',')) {
01644       c++;
01645    }
01646 
01647    s = c;
01648    while (*c && (*c >= 33 && *c != ',')) {
01649       c++, (*len)++;
01650    }
01651    *next = c;
01652 
01653    if (*len == 0) {
01654       s = NULL, *next = NULL;
01655    }
01656 
01657    return s;
01658 }
01659 
01660 static struct mgcp_gateway *find_realtime_gw(char *name, char *at, struct sockaddr_in *sin)
01661 {
01662    struct mgcp_gateway *g = NULL;
01663    struct ast_variable *mgcpgwconfig = NULL;
01664    struct ast_variable *gwv, *epname = NULL;
01665    struct mgcp_endpoint *e;
01666    char lines[256];
01667    int i, j;
01668 
01669    ast_debug(1, "*** find Realtime MGCPGW\n");
01670 
01671    if (!(i = ast_check_realtime("mgcpgw")) || !(j = ast_check_realtime("mgcpep"))) {
01672       return NULL;
01673    }
01674 
01675    if (ast_strlen_zero(at)) {
01676       ast_debug(1, "null gw name\n");
01677       return NULL;
01678    }
01679 
01680    if (!(mgcpgwconfig = ast_load_realtime("mgcpgw", "name", at, NULL))) {
01681       return NULL;
01682    }
01683 
01684    /*!
01685     * \note This is a fairly odd way of instantiating lines.  Instead of each
01686     * line created by virtue of being in the database (and loaded via
01687     * ast_load_realtime_multientry), this code forces a specific order with a
01688     * "lines" entry in the "mgcpgw" record.  This has benefits, because as with
01689     * chan_dahdi, values are inherited across definitions.  The downside is
01690     * that it's not as clear what the values will be simply by looking at a
01691     * single row in the database, and it's probable that the sanest configuration
01692     * should have the first column in the "mgcpep" table be "clearvars", with a
01693     * static value of "all", if any variables are set at all.  It may be worth
01694     * making this assumption explicit in the code in the future, and then just
01695     * using ast_load_realtime_multientry for the "mgcpep" records.
01696     */
01697    lines[0] = '\0';
01698    for (gwv = mgcpgwconfig; gwv; gwv = gwv->next) {
01699       if (!strcasecmp(gwv->name, "lines")) {
01700          ast_copy_string(lines, gwv->value, sizeof(lines));
01701          break;
01702       }
01703    }
01704    /* Position gwv at the end of the list */
01705    for (gwv = gwv && gwv->next ? gwv : mgcpgwconfig; gwv->next; gwv = gwv->next);
01706 
01707    if (!ast_strlen_zero(lines)) {
01708       AST_DECLARE_APP_ARGS(args,
01709          AST_APP_ARG(line)[100];
01710       );
01711       AST_STANDARD_APP_ARGS(args, lines);
01712       for (i = 0; i < args.argc; i++) {
01713          gwv->next = ast_load_realtime("mgcpep", "name", at, "line", args.line[i], NULL);
01714 
01715          /* Remove "line" AND position gwv at the end of the list. */
01716          for (epname = NULL; gwv->next; gwv = gwv->next) {
01717             if (!strcasecmp(gwv->next->name, "line")) {
01718                /* Remove it from the list */
01719                epname = gwv->next;
01720                gwv->next = gwv->next->next;
01721             }
01722          }
01723          /* Since "line" instantiates the configuration, we have to move it to the end. */
01724          if (epname) {
01725             gwv->next = epname;
01726             epname->next = NULL;
01727             gwv = gwv->next;
01728          }
01729       }
01730    }
01731    for (gwv = mgcpgwconfig; gwv; gwv = gwv->next) {
01732       ast_debug(1, "MGCP Realtime var: %s => %s\n", gwv->name, gwv->value);
01733    }
01734 
01735    if (mgcpgwconfig) {
01736       g = build_gateway(at, mgcpgwconfig);
01737       ast_variables_destroy(mgcpgwconfig);
01738    }
01739    if (g) {
01740       g->next = gateways;
01741       g->realtime = 1;
01742       gateways = g;
01743       for (e = g->endpoints; e; e = e->next) {
01744          transmit_audit_endpoint(e);
01745          e->needaudit = 0;
01746       }
01747    }
01748    return g;
01749 }
01750 
01751 static struct mgcp_subchannel *find_subchannel_and_lock(char *name, int msgid, struct sockaddr_in *sin)
01752 {
01753    struct mgcp_endpoint *p = NULL;
01754    struct mgcp_subchannel *sub = NULL;
01755    struct mgcp_gateway *g;
01756    char tmp[256] = "";
01757    char *at = NULL, *c;
01758    int found = 0;
01759    if (name) {
01760       ast_copy_string(tmp, name, sizeof(tmp));
01761       at = strchr(tmp, '@');
01762       if (!at) {
01763          ast_log(LOG_NOTICE, "Endpoint '%s' has no at sign!\n", name);
01764          return NULL;
01765       }
01766       *at++ = '\0';
01767    }
01768    ast_mutex_lock(&gatelock);
01769    if (at && (at[0] == '[')) {
01770       at++;
01771       c = strrchr(at, ']');
01772       if (c) {
01773          *c = '\0';
01774       }
01775    }
01776    for (g = gateways ? gateways : find_realtime_gw(name, at, sin); g; g = g->next ? g->next : find_realtime_gw(name, at, sin)) {
01777       if ((!name || !strcasecmp(g->name, at)) &&
01778           (sin || g->addr.sin_addr.s_addr || g->defaddr.sin_addr.s_addr)) {
01779          /* Found the gateway.  If it's dynamic, save it's address -- now for the endpoint */
01780          if (sin && g->dynamic && name) {
01781             if ((g->addr.sin_addr.s_addr != sin->sin_addr.s_addr) ||
01782                (g->addr.sin_port != sin->sin_port)) {
01783                memcpy(&g->addr, sin, sizeof(g->addr));
01784                {
01785                   struct ast_sockaddr tmp1, tmp2;
01786                   struct sockaddr_in tmp3 = {0,};
01787 
01788                   tmp3.sin_addr = g->ourip;
01789                   ast_sockaddr_from_sin(&tmp1, &g->addr);
01790                   ast_sockaddr_from_sin(&tmp2, &tmp3);
01791                   if (ast_ouraddrfor(&tmp1, &tmp2)) {
01792                      memcpy(&g->ourip, &__ourip, sizeof(g->ourip));
01793                   }
01794                   ast_sockaddr_to_sin(&tmp2, &tmp3);
01795                   g->ourip = tmp3.sin_addr;
01796                }
01797                ast_verb(3, "Registered MGCP gateway '%s' at %s port %d\n", g->name, ast_inet_ntoa(g->addr.sin_addr), ntohs(g->addr.sin_port));
01798             }
01799          /* not dynamic, check if the name matches */
01800          } else if (name) {
01801             if (strcasecmp(g->name, at)) {
01802                g = g->next;
01803                continue;
01804             }
01805          /* not dynamic, no name, check if the addr matches */
01806          } else if (!name && sin) {
01807             if ((g->addr.sin_addr.s_addr != sin->sin_addr.s_addr) ||
01808                 (g->addr.sin_port != sin->sin_port)) {
01809                if(!g->next)
01810                   g = find_realtime_gw(name, at, sin);
01811                else
01812                   g = g->next;
01813                continue;
01814             }
01815          } else {
01816             continue;
01817          }
01818          for (p = g->endpoints; p; p = p->next) {
01819             ast_debug(1, "Searching on %s@%s for subchannel\n", p->name, g->name);
01820             if (msgid) {
01821                sub = p->sub;
01822                found = 1;
01823                break;
01824             } else if (name && !strcasecmp(p->name, tmp)) {
01825                ast_debug(1, "Coundn't determine subchannel, assuming current master %s@%s-%d\n",
01826                   p->name, g->name, p->sub->id);
01827                sub = p->sub;
01828                found = 1;
01829                break;
01830             }
01831          }
01832          if (sub && found) {
01833             ast_mutex_lock(&sub->lock);
01834             break;
01835          }
01836       }
01837    }
01838    ast_mutex_unlock(&gatelock);
01839    if (!sub) {
01840       if (name) {
01841          if (g) {
01842             ast_log(LOG_NOTICE, "Endpoint '%s' not found on gateway '%s'\n", tmp, at);
01843          } else {
01844             ast_log(LOG_NOTICE, "Gateway '%s' (and thus its endpoint '%s') does not exist\n", at, tmp);
01845          }
01846       }
01847    }
01848    return sub;
01849 }
01850 
01851 static void parse(struct mgcp_request *req)
01852 {
01853    /* Divide fields by NULL's */
01854    char *c;
01855    int f = 0;
01856    c = req->data;
01857 
01858    /* First header starts immediately */
01859    req->header[f] = c;
01860    for (; *c; c++) {
01861       if (*c == '\n') {
01862          /* We've got a new header */
01863          *c = 0;
01864          ast_debug(3, "Header: %s (%d)\n", req->header[f], (int) strlen(req->header[f]));
01865          if (ast_strlen_zero(req->header[f])) {
01866             /* Line by itself means we're now in content */
01867             c++;
01868             break;
01869          }
01870          if (f >= MGCP_MAX_HEADERS - 1) {
01871             ast_log(LOG_WARNING, "Too many MGCP headers...\n");
01872          } else {
01873             f++;
01874          }
01875          req->header[f] = c + 1;
01876       } else if (*c == '\r') {
01877          /* Ignore but eliminate \r's */
01878          *c = 0;
01879       }
01880    }
01881    /* Check for last header */
01882    if (!ast_strlen_zero(req->header[f])) {
01883       f++;
01884    }
01885    req->headers = f;
01886    /* Now we process any mime content */
01887    f = 0;
01888    req->line[f] = c;
01889    for (; *c; c++) {
01890       if (*c == '\n') {
01891          /* We've got a new line */
01892          *c = 0;
01893          ast_debug(3, "Line: %s (%d)\n", req->line[f], (int) strlen(req->line[f]));
01894          if (f >= MGCP_MAX_LINES - 1) {
01895             ast_log(LOG_WARNING, "Too many SDP lines...\n");
01896          } else {
01897             f++;
01898          }
01899          req->line[f] = c + 1;
01900       } else if (*c == '\r') {
01901          /* Ignore and eliminate \r's */
01902          *c = 0;
01903       }
01904    }
01905    /* Check for last line */
01906    if (!ast_strlen_zero(req->line[f])) {
01907       f++;
01908    }
01909    req->lines = f;
01910    /* Parse up the initial header */
01911    c = req->header[0];
01912    while (*c && *c < 33) c++;
01913    /* First the verb */
01914    req->verb = c;
01915    while (*c && (*c > 32)) c++;
01916    if (*c) {
01917       *c = '\0';
01918       c++;
01919       while (*c && (*c < 33)) c++;
01920       req->identifier = c;
01921       while (*c && (*c > 32)) c++;
01922       if (*c) {
01923          *c = '\0';
01924          c++;
01925          while (*c && (*c < 33)) c++;
01926          req->endpoint = c;
01927          while (*c && (*c > 32)) c++;
01928          if (*c) {
01929             *c = '\0';
01930             c++;
01931             while (*c && (*c < 33)) c++;
01932             req->version = c;
01933             while (*c && (*c > 32)) c++;
01934             while (*c && (*c < 33)) c++;
01935             while (*c && (*c > 32)) c++;
01936             *c = '\0';
01937          }
01938       }
01939    }
01940 
01941    ast_debug(1, "Verb: '%s', Identifier: '%s', Endpoint: '%s', Version: '%s'\n",
01942          req->verb, req->identifier, req->endpoint, req->version);
01943    ast_debug(1, "%d headers, %d lines\n", req->headers, req->lines);
01944    if (*c) {
01945       ast_log(LOG_WARNING, "Odd content, extra stuff left over ('%s')\n", c);
01946    }
01947 }
01948 
01949 static int process_sdp(struct mgcp_subchannel *sub, struct mgcp_request *req)
01950 {
01951    char *m;
01952    char *c;
01953    char *a;
01954    char host[258];
01955    int len;
01956    int portno;
01957    format_t peercapability;
01958    int peerNonCodecCapability;
01959    struct sockaddr_in sin;
01960    struct ast_sockaddr sin_tmp;
01961    char *codecs;
01962    struct ast_hostent ahp; struct hostent *hp;
01963    int codec, codec_count=0;
01964    int iterator;
01965    struct mgcp_endpoint *p = sub->parent;
01966    char tmp1[256], tmp2[256], tmp3[256];
01967 
01968    /* Get codec and RTP info from SDP */
01969    m = get_sdp(req, "m");
01970    c = get_sdp(req, "c");
01971    if (ast_strlen_zero(m) || ast_strlen_zero(c)) {
01972       ast_log(LOG_WARNING, "Insufficient information for SDP (m = '%s', c = '%s')\n", m, c);
01973       return -1;
01974    }
01975    if (sscanf(c, "IN IP4 %256s", host) != 1) {
01976       ast_log(LOG_WARNING, "Invalid host in c= line, '%s'\n", c);
01977       return -1;
01978    }
01979    /* XXX This could block for a long time, and block the main thread! XXX */
01980    hp = ast_gethostbyname(host, &ahp);
01981    if (!hp) {
01982       ast_log(LOG_WARNING, "Unable to lookup host in c= line, '%s'\n", c);
01983       return -1;
01984    }
01985    if (sscanf(m, "audio %30d RTP/AVP %n", &portno, &len) != 1) {
01986       ast_log(LOG_WARNING, "Unable to determine port number for RTP in '%s'\n", m);
01987       return -1;
01988    }
01989    sin.sin_family = AF_INET;
01990    memcpy(&sin.sin_addr, hp->h_addr, sizeof(sin.sin_addr));
01991    sin.sin_port = htons(portno);
01992    ast_sockaddr_from_sin(&sin_tmp, &sin);
01993    ast_rtp_instance_set_remote_address(sub->rtp, &sin_tmp);
01994    ast_debug(3, "Peer RTP is at port %s:%d\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
01995    /* Scan through the RTP payload types specified in a "m=" line: */
01996    ast_rtp_codecs_payloads_clear(ast_rtp_instance_get_codecs(sub->rtp), sub->rtp);
01997    codecs = ast_strdupa(m + len);
01998    while (!ast_strlen_zero(codecs)) {
01999       if (sscanf(codecs, "%30d%n", &codec, &len) != 1) {
02000          if (codec_count) {
02001             break;
02002          }
02003          ast_log(LOG_WARNING, "Error in codec string '%s' at '%s'\n", m, codecs);
02004          return -1;
02005       }
02006       ast_rtp_codecs_payloads_set_m_type(ast_rtp_instance_get_codecs(sub->rtp), sub->rtp, codec);
02007       codec_count++;
02008       codecs += len;
02009    }
02010 
02011    /* Next, scan through each "a=rtpmap:" line, noting each */
02012    /* specified RTP payload type (with corresponding MIME subtype): */
02013    sdpLineNum_iterator_init(&iterator);
02014    while ((a = get_sdp_iterate(&iterator, req, "a"))[0] != '\0') {
02015       char* mimeSubtype = ast_strdupa(a); /* ensures we have enough space */
02016       if (sscanf(a, "rtpmap: %30u %127[^/]/", &codec, mimeSubtype) != 2)
02017          continue;
02018       /* Note: should really look at the 'freq' and '#chans' params too */
02019       ast_rtp_codecs_payloads_set_rtpmap_type(ast_rtp_instance_get_codecs(sub->rtp), sub->rtp, codec, "audio", mimeSubtype, 0);
02020    }
02021 
02022    /* Now gather all of the codecs that were asked for: */
02023    ast_rtp_codecs_payload_formats(ast_rtp_instance_get_codecs(sub->rtp), &peercapability, &peerNonCodecCapability);
02024    p->capability = capability & peercapability;
02025    ast_debug(1, "Capabilities: us - %s, them - %s, combined - %s\n",
02026       ast_getformatname_multiple(tmp1, sizeof(tmp1), capability),
02027       ast_getformatname_multiple(tmp2, sizeof(tmp2), peercapability),
02028       ast_getformatname_multiple(tmp3, sizeof(tmp3), p->capability));
02029    ast_debug(1, "Non-codec capabilities: us - %d, them - %d, combined - %d\n",
02030       nonCodecCapability, peerNonCodecCapability, p->nonCodecCapability);
02031    if (!p->capability) {
02032       ast_log(LOG_WARNING, "No compatible codecs!\n");
02033       return -1;
02034    }
02035    return 0;
02036 }
02037 
02038 static int add_header(struct mgcp_request *req, const char *var, const char *value)
02039 {
02040    if (req->len >= sizeof(req->data) - 4) {
02041       ast_log(LOG_WARNING, "Out of space, can't add anymore\n");
02042       return -1;
02043    }
02044    if (req->lines) {
02045       ast_log(LOG_WARNING, "Can't add more headers when lines have been added\n");
02046       return -1;
02047    }
02048    req->header[req->headers] = req->data + req->len;
02049    snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s: %s\r\n", var, value);
02050    req->len += strlen(req->header[req->headers]);
02051    if (req->headers < MGCP_MAX_HEADERS) {
02052       req->headers++;
02053    } else {
02054       ast_log(LOG_WARNING, "Out of header space\n");
02055       return -1;
02056    }
02057    return 0;
02058 }
02059 
02060 static int add_line(struct mgcp_request *req, char *line)
02061 {
02062    if (req->len >= sizeof(req->data) - 4) {
02063       ast_log(LOG_WARNING, "Out of space, can't add anymore\n");
02064       return -1;
02065    }
02066    if (!req->lines) {
02067       /* Add extra empty return */
02068       ast_copy_string(req->data + req->len, "\r\n", sizeof(req->data) - req->len);
02069       req->len += strlen(req->data + req->len);
02070    }
02071    req->line[req->lines] = req->data + req->len;
02072    snprintf(req->line[req->lines], sizeof(req->data) - req->len, "%s", line);
02073    req->len += strlen(req->line[req->lines]);
02074    if (req->lines < MGCP_MAX_LINES) {
02075       req->lines++;
02076    } else {
02077       ast_log(LOG_WARNING, "Out of line space\n");
02078       return -1;
02079    }
02080    return 0;
02081 }
02082 
02083 static int init_resp(struct mgcp_request *req, char *resp, struct mgcp_request *orig, char *resprest)
02084 {
02085    /* Initialize a response */
02086    if (req->headers || req->len) {
02087       ast_log(LOG_WARNING, "Request already initialized?!?\n");
02088       return -1;
02089    }
02090    req->header[req->headers] = req->data + req->len;
02091    snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %s %s\r\n", resp, orig->identifier, resprest);
02092    req->len += strlen(req->header[req->headers]);
02093    if (req->headers < MGCP_MAX_HEADERS) {
02094       req->headers++;
02095    } else {
02096       ast_log(LOG_WARNING, "Out of header space\n");
02097    }
02098    return 0;
02099 }
02100 
02101 static int init_req(struct mgcp_endpoint *p, struct mgcp_request *req, char *verb)
02102 {
02103    /* Initialize a response */
02104    if (req->headers || req->len) {
02105       ast_log(LOG_WARNING, "Request already initialized?!?\n");
02106       return -1;
02107    }
02108    req->header[req->headers] = req->data + req->len;
02109    /* check if we need brackets around the gw name */
02110    if (p->parent->isnamedottedip) {
02111       snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %d %s@[%s] MGCP 1.0%s\r\n", verb, oseq, p->name, p->parent->name, p->ncs ? " NCS 1.0" : "");
02112    } else {
02113 +     snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %d %s@%s MGCP 1.0%s\r\n", verb, oseq, p->name, p->parent->name, p->ncs ? " NCS 1.0" : "");
02114    }
02115    req->len += strlen(req->header[req->headers]);
02116    if (req->headers < MGCP_MAX_HEADERS) {
02117       req->headers++;
02118    } else {
02119       ast_log(LOG_WARNING, "Out of header space\n");
02120    }
02121    return 0;
02122 }
02123 
02124 
02125 static int respprep(struct mgcp_request *resp, struct mgcp_endpoint *p, char *msg, struct mgcp_request *req, char *msgrest)
02126 {
02127    memset(resp, 0, sizeof(*resp));
02128    init_resp(resp, msg, req, msgrest);
02129    return 0;
02130 }
02131 
02132 static int reqprep(struct mgcp_request *req, struct mgcp_endpoint *p, char *verb)
02133 {
02134    memset(req, 0, sizeof(struct mgcp_request));
02135    oseq++;
02136    if (oseq > 999999999) {
02137       oseq = 1;
02138    }
02139    init_req(p, req, verb);
02140    return 0;
02141 }
02142 
02143 static int transmit_response(struct mgcp_subchannel *sub, char *msg, struct mgcp_request *req, char *msgrest)
02144 {
02145    struct mgcp_request resp;
02146    struct mgcp_endpoint *p = sub->parent;
02147    struct mgcp_response *mgr;
02148 
02149    if (!sub) {
02150       return -1;
02151    }
02152 
02153    respprep(&resp, p, msg, req, msgrest);
02154    if (!(mgr = ast_calloc(1, sizeof(*mgr) + resp.len + 1))) {
02155       return send_response(sub, &resp);
02156    }
02157    /* Store MGCP response in case we have to retransmit */
02158    sscanf(req->identifier, "%30d", &mgr->seqno);
02159    time(&mgr->whensent);
02160    mgr->len = resp.len;
02161    memcpy(mgr->buf, resp.data, resp.len);
02162    mgr->buf[resp.len] = '\0';
02163    mgr->next = p->parent->responses;
02164    p->parent->responses = mgr;
02165 
02166    return send_response(sub, &resp);
02167 }
02168 
02169 
02170 static int add_sdp(struct mgcp_request *resp, struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp)
02171 {
02172    int len;
02173    int codec;
02174    char costr[80];
02175    struct sockaddr_in sin;
02176    struct ast_sockaddr sin_tmp;
02177    char v[256];
02178    char s[256];
02179    char o[256];
02180    char c[256];
02181    char t[256];
02182    char m[256] = "";
02183    char a[1024] = "";
02184    format_t x;
02185    struct sockaddr_in dest = { 0, };
02186    struct ast_sockaddr dest_tmp;
02187    struct mgcp_endpoint *p = sub->parent;
02188    /* XXX We break with the "recommendation" and send our IP, in order that our
02189           peer doesn't have to ast_gethostbyname() us XXX */
02190    len = 0;
02191    if (!sub->rtp) {
02192       ast_log(LOG_WARNING, "No way to add SDP without an RTP structure\n");
02193       return -1;
02194    }
02195    ast_rtp_instance_get_local_address(sub->rtp, &sin_tmp);
02196    ast_sockaddr_to_sin(&sin_tmp, &sin);
02197    if (rtp) {
02198       ast_rtp_instance_get_remote_address(sub->rtp, &dest_tmp);
02199       ast_sockaddr_to_sin(&dest_tmp, &dest);
02200    } else {
02201       if (sub->tmpdest.sin_addr.s_addr) {
02202          dest.sin_addr = sub->tmpdest.sin_addr;
02203          dest.sin_port = sub->tmpdest.sin_port;
02204          /* Reset temporary destination */
02205          memset(&sub->tmpdest, 0, sizeof(sub->tmpdest));
02206       } else {
02207          dest.sin_addr = p->parent->ourip;
02208          dest.sin_port = sin.sin_port;
02209       }
02210    }
02211    ast_debug(1, "We're at %s port %d\n", ast_inet_ntoa(p->parent->ourip), ntohs(sin.sin_port));
02212    ast_copy_string(v, "v=0\r\n", sizeof(v));
02213    snprintf(o, sizeof(o), "o=root %d %d IN IP4 %s\r\n", (int)getpid(), (int)getpid(), ast_inet_ntoa(dest.sin_addr));
02214    ast_copy_string(s, "s=session\r\n", sizeof(s));
02215    snprintf(c, sizeof(c), "c=IN IP4 %s\r\n", ast_inet_ntoa(dest.sin_addr));
02216    ast_copy_string(t, "t=0 0\r\n", sizeof(t));
02217    snprintf(m, sizeof(m), "m=audio %d RTP/AVP", ntohs(dest.sin_port));
02218    for (x = 1LL; x <= AST_FORMAT_AUDIO_MASK; x <<= 1) {
02219       if (!(x & AST_FORMAT_AUDIO_MASK)) {
02220          /* Audio is now discontiguous */
02221          continue;
02222       }
02223       if (p->capability & x) {
02224          ast_debug(1, "Answering with capability %s\n", ast_getformatname(x));
02225          codec = ast_rtp_codecs_payload_code(ast_rtp_instance_get_codecs(sub->rtp), 1, x);
02226          if (codec > -1) {
02227             snprintf(costr, sizeof(costr), " %d", codec);
02228             strncat(m, costr, sizeof(m) - strlen(m) - 1);
02229             snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype2(1, x, 0));
02230             strncat(a, costr, sizeof(a) - strlen(a) - 1);
02231          }
02232       }
02233    }
02234    for (x = 1LL; x <= AST_RTP_MAX; x <<= 1) {
02235       if (p->nonCodecCapability & x) {
02236          ast_debug(1, "Answering with non-codec capability %d\n", (int) x);
02237          codec = ast_rtp_codecs_payload_code(ast_rtp_instance_get_codecs(sub->rtp), 0, x);
02238          if (codec > -1) {
02239             snprintf(costr, sizeof(costr), " %d", codec);
02240             strncat(m, costr, sizeof(m) - strlen(m) - 1);
02241             snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype2(0, x, 0));
02242             strncat(a, costr, sizeof(a) - strlen(a) - 1);
02243             if (x == AST_RTP_DTMF) {
02244                /* Indicate we support DTMF...  Not sure about 16,
02245                   but MSN supports it so dang it, we will too... */
02246                snprintf(costr, sizeof costr, "a=fmtp:%d 0-16\r\n", codec);
02247                strncat(a, costr, sizeof(a) - strlen(a) - 1);
02248             }
02249          }
02250       }
02251    }
02252    strncat(m, "\r\n", sizeof(m) - strlen(m) - 1);
02253    len = strlen(v) + strlen(s) + strlen(o) + strlen(c) + strlen(t) + strlen(m) + strlen(a);
02254    snprintf(costr, sizeof(costr), "%d", len);
02255    add_line(resp, v);
02256    add_line(resp, o);
02257    add_line(resp, s);
02258    add_line(resp, c);
02259    add_line(resp, t);
02260    add_line(resp, m);
02261    add_line(resp, a);
02262    return 0;
02263 }
02264 
02265 static int transmit_modify_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp, format_t codecs)
02266 {
02267    struct mgcp_request resp;
02268    char local[256];
02269    char tmp[80];
02270    struct mgcp_endpoint *p = sub->parent;
02271    format_t x;
02272    struct ast_sockaddr sub_tmpdest_tmp;
02273 
02274    if (ast_strlen_zero(sub->cxident) && rtp) {
02275       /* We don't have a CXident yet, store the destination and
02276          wait a bit */
02277       ast_rtp_instance_get_remote_address(rtp, &sub_tmpdest_tmp);
02278       ast_sockaddr_to_sin(&sub_tmpdest_tmp, &sub->tmpdest);
02279       return 0;
02280    }
02281    ast_copy_string(local, "e:on, s:off, p:20", sizeof(local));
02282    for (x = 1; x <= AST_FORMAT_AUDIO_MASK; x <<= 1) {
02283       if (!(x & AST_FORMAT_AUDIO_MASK)) {
02284          /* No longer contiguous */
02285          continue;
02286       }
02287       if (p->capability & x) {
02288          snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype2(1, x, 0));
02289          strncat(local, tmp, sizeof(local) - strlen(local) - 1);
02290       }
02291    }
02292 
02293    if (sub->gate) {
02294       if (sub->gate->state == GATE_ALLOCATED || sub->gate->state == GATE_OPEN) {
02295          snprintf(tmp, sizeof(tmp), ", dq-gi:%x", sub->gate->gateid);
02296          strncat(local, tmp, sizeof(local) - strlen(local) - 1);
02297          sub->sdpsent = 1;
02298       } else {
02299          /* oops wait */
02300          ast_debug(1, "Waiting for opened gate...\n");
02301          sub->sdpsent = 0;
02302          return 0;
02303       }
02304    }
02305 
02306 
02307    reqprep(&resp, p, "MDCX");
02308    add_header(&resp, "C", sub->callid);
02309    add_header(&resp, "L", local);
02310    add_header(&resp, "M", mgcp_cxmodes[sub->cxmode]);
02311    /* X header should not be sent. kept for compatibility */
02312    add_header(&resp, "X", sub->txident);
02313    add_header(&resp, "I", sub->cxident);
02314    /*add_header(&resp, "S", "");*/
02315    add_sdp(&resp, sub, rtp);
02316    /* fill in new fields */
02317    resp.cmd = MGCP_CMD_MDCX;
02318    resp.trid = oseq;
02319    return send_request(p, sub, &resp, oseq);
02320 }
02321 
02322 static int transmit_connect_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp)
02323 {
02324    struct mgcp_request resp;
02325    char local[256];
02326    char tmp[80];
02327    int x;
02328    struct mgcp_endpoint *p = sub->parent;
02329 
02330    ast_debug(3, "Creating connection for %s@%s-%d in cxmode: %s callid: %s\n",
02331        p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
02332 
02333    ast_copy_string(local, "e:on, s:off, p:20", sizeof(local));
02334 
02335    for (x = 1; x <= AST_FORMAT_AUDIO_MASK; x <<= 1) {
02336       if (!(x & AST_FORMAT_AUDIO_MASK)) {
02337          /* No longer contiguous */
02338          continue;
02339       }
02340       if (p->capability & x) {
02341          snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype2(1, x, 0));
02342          strncat(local, tmp, sizeof(local) - strlen(local) - 1);
02343       }
02344    }
02345 
02346    if (sub->gate) {
02347       if(sub->gate->state == GATE_ALLOCATED) {
02348          snprintf(tmp, sizeof(tmp), ", dq-gi:%x", sub->gate->gateid);
02349          strncat(local, tmp, sizeof(local) - strlen(local) - 1);
02350       }
02351    }
02352    sub->sdpsent = 1;
02353    reqprep(&resp, p, "CRCX");
02354    add_header(&resp, "C", sub->callid);
02355    add_header(&resp, "L", local);
02356    add_header(&resp, "M", mgcp_cxmodes[sub->cxmode]);
02357    /* X header should not be sent. kept for compatibility */
02358    add_header(&resp, "X", sub->txident);
02359    /*add_header(&resp, "S", "");*/
02360    add_sdp(&resp, sub, rtp);
02361    /* fill in new fields */
02362    resp.cmd = MGCP_CMD_CRCX;
02363    resp.trid = oseq;
02364    return send_request(p, sub, &resp, oseq);
02365 }
02366 
02367 static int mgcp_pktcgate_remove(struct cops_gate *gate)
02368 {
02369    struct mgcp_subchannel *sub = gate->tech_pvt;
02370 
02371    if (!sub) {
02372       return 1;
02373    }
02374 
02375    ast_mutex_lock(&sub->lock);
02376    ast_debug(1, "Pktc: gate 0x%x deleted\n", gate->gateid);
02377    if (sub->gate->state != GATE_CLOSED && sub->parent->hangupongateremove) {
02378       sub->gate = NULL;
02379       if (sub->owner) {
02380          ast_softhangup(sub->owner, AST_CAUSE_REQUESTED_CHAN_UNAVAIL);
02381          ast_channel_unlock(sub->owner);
02382       }
02383    } else {
02384       sub->gate = NULL;
02385    }
02386    ast_mutex_unlock(&sub->lock);
02387    return 1;
02388 }
02389 
02390 static int mgcp_pktcgate_open(struct cops_gate *gate)
02391 {
02392    struct mgcp_subchannel *sub = gate->tech_pvt;
02393    if (!sub) {
02394       return 1;
02395    }
02396    ast_mutex_lock(&sub->lock);
02397    ast_debug(1, "Pktc: gate 0x%x open\n", gate->gateid);
02398    if (!sub->sdpsent) transmit_modify_with_sdp(sub, NULL, 0);
02399    ast_mutex_unlock(&sub->lock);
02400    return 1;
02401 }
02402 
02403 static int mgcp_alloc_pktcgate(struct mgcp_subchannel *sub)
02404 {
02405    struct mgcp_endpoint *p = sub->parent;
02406    sub->gate = ast_pktccops_gate_alloc(GATE_SET, NULL, ntohl(p->parent->addr.sin_addr.s_addr),
02407                8, 128000, 232, 0, 0, NULL, &mgcp_pktcgate_remove);
02408 
02409    if (!sub->gate) {
02410       return 0;
02411    }
02412    sub->gate->tech_pvt = sub;
02413    sub->gate->gate_open = &mgcp_pktcgate_open;
02414    return 1;
02415 }
02416 
02417 static int transmit_connect(struct mgcp_subchannel *sub)
02418 {
02419    struct mgcp_request resp;
02420    char local[256];
02421    char tmp[80];
02422    format_t x;
02423    struct mgcp_endpoint *p = sub->parent;
02424 
02425    ast_copy_string(local, "p:20, s:off, e:on", sizeof(local));
02426 
02427    for (x = 1LL; x <= AST_FORMAT_AUDIO_MASK; x <<= 1) {
02428       if (p->capability & x) {
02429          snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype2(1, x, 0));
02430          strncat(local, tmp, sizeof(local) - strlen(local) - 1);
02431       }
02432    }
02433 
02434    ast_debug(3, "Creating connection for %s@%s-%d in cxmode: %s callid: %s\n",
02435           p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
02436    sub->sdpsent = 0;
02437    reqprep(&resp, p, "CRCX");
02438    add_header(&resp, "C", sub->callid);
02439    add_header(&resp, "L", local);
02440    add_header(&resp, "M", "inactive");
02441    /* X header should not be sent. kept for compatibility */
02442    add_header(&resp, "X", sub->txident);
02443    /*add_header(&resp, "S", "");*/
02444    /* fill in new fields */
02445    resp.cmd = MGCP_CMD_CRCX;
02446    resp.trid = oseq;
02447    return send_request(p, sub, &resp, oseq);
02448 }
02449 
02450 static int transmit_notify_request(struct mgcp_subchannel *sub, char *tone)
02451 {
02452    struct mgcp_request resp;
02453    struct mgcp_endpoint *p = sub->parent;
02454 
02455    ast_debug(3, "MGCP Asked to indicate tone: %s on  %s@%s-%d in cxmode: %s\n",
02456       tone, p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode]);
02457    ast_copy_string(p->curtone, tone, sizeof(p->curtone));
02458    reqprep(&resp, p, "RQNT");
02459    add_header(&resp, "X", p->rqnt_ident);
02460    switch (p->hookstate) {
02461    case MGCP_ONHOOK:
02462       add_header(&resp, "R", "L/hd(N)");
02463       break;
02464    case MGCP_OFFHOOK:
02465       add_header_offhook(sub, &resp, tone);
02466       break;
02467    }
02468    if (!ast_strlen_zero(tone)) {
02469       add_header(&resp, "S", tone);
02470    }
02471    /* fill in new fields */
02472    resp.cmd = MGCP_CMD_RQNT;
02473    resp.trid = oseq;
02474    return send_request(p, NULL, &resp, oseq);
02475 }
02476 
02477 static int transmit_notify_request_with_callerid(struct mgcp_subchannel *sub, char *tone, char *callernum, char *callername)
02478 {
02479    struct mgcp_request resp;
02480    char tone2[256];
02481    char *l, *n;
02482    struct timeval t = ast_tvnow();
02483    struct ast_tm tm;
02484    struct mgcp_endpoint *p = sub->parent;
02485 
02486    ast_localtime(&t, &tm, NULL);
02487    n = callername;
02488    l = callernum;
02489    if (!n)
02490       n = "";
02491    if (!l)
02492       l = "";
02493 
02494    /* Keep track of last callerid for blacklist and callreturn */
02495    ast_copy_string(p->lastcallerid, l, sizeof(p->lastcallerid));
02496 
02497    snprintf(tone2, sizeof(tone2), "%s,L/ci(%02d/%02d/%02d/%02d,%s,%s)", tone,
02498       tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, l, n);
02499    ast_copy_string(p->curtone, tone, sizeof(p->curtone));
02500    reqprep(&resp, p, "RQNT");
02501    add_header(&resp, "X", p->rqnt_ident);
02502    switch (p->hookstate) {
02503    case MGCP_ONHOOK:
02504       add_header(&resp, "R", "L/hd(N)");
02505       break;
02506    case MGCP_OFFHOOK:
02507       add_header_offhook(sub, &resp, tone);
02508       break;
02509    }
02510    if (!ast_strlen_zero(tone2)) {
02511       add_header(&resp, "S", tone2);
02512    }
02513    ast_debug(3, "MGCP Asked to indicate tone: %s on  %s@%s-%d in cxmode: %s\n",
02514       tone2, p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode]);
02515    /* fill in new fields */
02516    resp.cmd = MGCP_CMD_RQNT;
02517    resp.trid = oseq;
02518    return send_request(p, NULL, &resp, oseq);
02519 }
02520 
02521 static int transmit_modify_request(struct mgcp_subchannel *sub)
02522 {
02523    struct mgcp_request resp;
02524    struct mgcp_endpoint *p = sub->parent;
02525    format_t x;
02526    int fc = 1;
02527    char local[256];
02528    char tmp[80];
02529 
02530    if (ast_strlen_zero(sub->cxident)) {
02531       /* We don't have a CXident yet, store the destination and
02532          wait a bit */
02533       return 0;
02534    }
02535    ast_debug(3, "Modified %s@%s-%d with new mode: %s on callid: %s\n",
02536       p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
02537 
02538    ast_copy_string(local, "", sizeof(local));
02539    for (x = 1; x <= AST_FORMAT_AUDIO_MASK; x <<= 1) {
02540       if (p->capability & x) {
02541          if (p->ncs && !fc) {
02542             p->capability = x; /* sb5120e bug */
02543             break;
02544          } else {
02545             fc = 0;
02546             snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype2(1, x, 0));
02547          }
02548          strncat(local, tmp, sizeof(local) - strlen(local) - 1);
02549       }
02550    }
02551 
02552    if (!sub->sdpsent) {
02553       if (sub->gate) {
02554          if (sub->gate->state == GATE_ALLOCATED || sub->gate->state == GATE_OPEN) {
02555             snprintf(tmp, sizeof(tmp), ", dq-gi:%x", sub->gate->gateid);
02556             strncat(local, tmp, sizeof(local) - strlen(local) - 1);
02557          } else {
02558                /* we still don't have gateid wait */
02559             return 0;
02560          }
02561       }
02562    }
02563 
02564    reqprep(&resp, p, "MDCX");
02565    add_header(&resp, "C", sub->callid);
02566    if (!sub->sdpsent) {
02567       add_header(&resp, "L", local);
02568    }
02569    add_header(&resp, "M", mgcp_cxmodes[sub->cxmode]);
02570    /* X header should not be sent. kept for compatibility */
02571    add_header(&resp, "X", sub->txident);
02572    add_header(&resp, "I", sub->cxident);
02573    switch (sub->parent->hookstate) {
02574    case MGCP_ONHOOK:
02575       add_header(&resp, "R", "L/hd(N)");
02576       break;
02577    case MGCP_OFFHOOK:
02578       add_header_offhook(sub, &resp, "");
02579       break;
02580    }
02581    if (!sub->sdpsent) {
02582       add_sdp(&resp, sub, NULL);
02583       sub->sdpsent = 1;
02584    }
02585    /* fill in new fields */
02586    resp.cmd = MGCP_CMD_MDCX;
02587    resp.trid = oseq;
02588    return send_request(p, sub, &resp, oseq);
02589 }
02590 
02591 
02592 static void add_header_offhook(struct mgcp_subchannel *sub, struct mgcp_request *resp, char *tone)
02593 {
02594    struct mgcp_endpoint *p = sub->parent;
02595    char tone_indicate_end = 0;
02596 
02597    /* We also should check the tone to indicate, because it have no sense
02598       to request notify D/[0-9#*] (dtmf keys) if we are sending congestion
02599       tone for example G/cg */
02600    if (p && (!strcasecmp(tone, (p->ncs ? "L/ro" : "G/cg")))) {
02601       tone_indicate_end = 1;
02602    }
02603 
02604    if (p && p->sub && p->sub->owner &&
02605          p->sub->owner->_state >= AST_STATE_RINGING &&
02606          (p->dtmfmode & (MGCP_DTMF_INBAND | MGCP_DTMF_HYBRID))) {
02607        add_header(resp, "R", "L/hu(N),L/hf(N)");
02608 
02609    } else if (!tone_indicate_end){
02610        add_header(resp, "R", (p->ncs ? "L/hu(N),L/hf(N),L/[0-9#*](N)" : "L/hu(N),L/hf(N),D/[0-9#*](N)"));
02611    } else {
02612       ast_debug(1, "We don't want more digits if we will end the call\n");
02613       add_header(resp, "R", "L/hu(N),L/hf(N)");
02614    }
02615 }
02616 
02617 
02618 
02619 
02620 static int transmit_audit_endpoint(struct mgcp_endpoint *p)
02621 {
02622    struct mgcp_request resp;
02623    reqprep(&resp, p, "AUEP");
02624    /* removed unknown param VS */
02625    /*add_header(&resp, "F", "A,R,D,S,X,N,I,T,O,ES,E,MD,M");*/
02626    add_header(&resp, "F", "A");
02627    /* fill in new fields */
02628    resp.cmd = MGCP_CMD_AUEP;
02629    resp.trid = oseq;
02630    return send_request(p, NULL, &resp, oseq);
02631 }
02632 
02633 static int transmit_connection_del(struct mgcp_subchannel *sub)
02634 {
02635    struct mgcp_endpoint *p = sub->parent;
02636    struct mgcp_request resp;
02637 
02638    ast_debug(3, "Delete connection %s %s@%s-%d with new mode: %s on callid: %s\n",
02639       sub->cxident, p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
02640    reqprep(&resp, p, "DLCX");
02641    /* check if call id is avail */
02642    if (sub->callid[0])
02643       add_header(&resp, "C", sub->callid);
02644    /* X header should not be sent. kept for compatibility */
02645    add_header(&resp, "X", sub->txident);
02646    /* check if cxident is avail */
02647    if (sub->cxident[0])
02648       add_header(&resp, "I", sub->cxident);
02649    /* fill in new fields */
02650    resp.cmd = MGCP_CMD_DLCX;
02651    resp.trid = oseq;
02652    return send_request(p, sub, &resp, oseq);
02653 }
02654 
02655 static int transmit_connection_del_w_params(struct mgcp_endpoint *p, char *callid, char *cxident)
02656 {
02657    struct mgcp_request resp;
02658 
02659    ast_debug(3, "Delete connection %s %s@%s on callid: %s\n",
02660       cxident ? cxident : "", p->name, p->parent->name, callid ? callid : "");
02661    reqprep(&resp, p, "DLCX");
02662    /* check if call id is avail */
02663    if (callid && *callid)
02664       add_header(&resp, "C", callid);
02665    /* check if cxident is avail */
02666    if (cxident && *cxident)
02667       add_header(&resp, "I", cxident);
02668    /* fill in new fields */
02669    resp.cmd = MGCP_CMD_DLCX;
02670    resp.trid = oseq;
02671    return send_request(p, p->sub, &resp, oseq);
02672 }
02673 
02674 /*! \brief  dump_cmd_queues: (SC:) cleanup pending commands */
02675 static void dump_cmd_queues(struct mgcp_endpoint *p, struct mgcp_subchannel *sub)
02676 {
02677    struct mgcp_request *t, *q;
02678 
02679    if (p) {
02680       ast_mutex_lock(&p->rqnt_queue_lock);
02681       for (q = p->rqnt_queue; q; t = q->next, ast_free(q), q=t);
02682       p->rqnt_queue = NULL;
02683       ast_mutex_unlock(&p->rqnt_queue_lock);
02684 
02685       ast_mutex_lock(&p->cmd_queue_lock);
02686       for (q = p->cmd_queue; q; t = q->next, ast_free(q), q=t);
02687       p->cmd_queue = NULL;
02688       ast_mutex_unlock(&p->cmd_queue_lock);
02689 
02690       ast_mutex_lock(&p->sub->cx_queue_lock);
02691       for (q = p->sub->cx_queue; q; t = q->next, ast_free(q), q=t);
02692       p->sub->cx_queue = NULL;
02693       ast_mutex_unlock(&p->sub->cx_queue_lock);
02694 
02695       ast_mutex_lock(&p->sub->next->cx_queue_lock);
02696       for (q = p->sub->next->cx_queue; q; t = q->next, ast_free(q), q=t);
02697       p->sub->next->cx_queue = NULL;
02698       ast_mutex_unlock(&p->sub->next->cx_queue_lock);
02699    } else if (sub) {
02700       ast_mutex_lock(&sub->cx_queue_lock);
02701       for (q = sub->cx_queue; q; t = q->next, ast_free(q), q=t);
02702       sub->cx_queue = NULL;
02703       ast_mutex_unlock(&sub->cx_queue_lock);
02704    }
02705 }
02706 
02707 
02708 /*! \brief  find_command: (SC:) remove command transaction from queue */
02709 static struct mgcp_request *find_command(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
02710       struct mgcp_request **queue, ast_mutex_t *l, int ident)
02711 {
02712    struct mgcp_request *prev, *req;
02713 
02714    ast_mutex_lock(l);
02715    for (prev = NULL, req = *queue; req; prev = req, req = req->next) {
02716       if (req->trid == ident) {
02717          /* remove from queue */
02718          if (!prev)
02719             *queue = req->next;
02720          else
02721             prev->next = req->next;
02722 
02723          /* send next pending command */
02724          if (*queue) {
02725             ast_debug(1, "Posting Queued Request:\n%s to %s:%d\n", (*queue)->data,
02726                ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
02727 
02728             mgcp_postrequest(p, sub, (*queue)->data, (*queue)->len, (*queue)->trid);
02729          }
02730          break;
02731       }
02732    }
02733    ast_mutex_unlock(l);
02734    return req;
02735 }
02736 
02737 /* modified for new transport mechanism */
02738 static void handle_response(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
02739       int result, unsigned int ident, struct mgcp_request *resp)
02740 {
02741    char *c;
02742    struct mgcp_request *req;
02743    struct mgcp_gateway *gw = p->parent;
02744 
02745    if (result < 200) {
02746       /* provisional response */
02747       return;
02748    }
02749 
02750    if (p->slowsequence)
02751       req = find_command(p, sub, &p->cmd_queue, &p->cmd_queue_lock, ident);
02752    else if (sub)
02753       req = find_command(p, sub, &sub->cx_queue, &sub->cx_queue_lock, ident);
02754    else if (!(req = find_command(p, sub, &p->rqnt_queue, &p->rqnt_queue_lock, ident)))
02755       req = find_command(p, sub, &p->cmd_queue, &p->cmd_queue_lock, ident);
02756 
02757    if (!req) {
02758       ast_verb(3, "No command found on [%s] for transaction %d. Ignoring...\n",
02759             gw->name, ident);
02760       return;
02761    }
02762 
02763    if (p && (result >= 400) && (result <= 599)) {
02764       switch (result) {
02765       case 401:
02766          p->hookstate = MGCP_OFFHOOK;
02767          break;
02768       case 402:
02769          p->hookstate = MGCP_ONHOOK;
02770          break;
02771       case 406:
02772          ast_log(LOG_NOTICE, "Transaction %d timed out\n", ident);
02773          break;
02774       case 407:
02775          ast_log(LOG_NOTICE, "Transaction %d aborted\n", ident);
02776          break;
02777       }
02778       if (sub) {
02779          if (!sub->cxident[0] && (req->cmd == MGCP_CMD_CRCX)) {
02780              ast_log(LOG_NOTICE, "DLCX for all connections on %s due to error %d\n", gw->name, result);
02781              transmit_connection_del(sub);
02782          }
02783          if (sub->owner) {
02784             ast_log(LOG_NOTICE, "Terminating on result %d from %s@%s-%d\n",
02785                result, p->name, p->parent->name, sub ? sub->id:-1);
02786             mgcp_queue_hangup(sub);
02787          }
02788       } else {
02789          if (p->sub->next->owner) {
02790             ast_log(LOG_NOTICE, "Terminating on result %d from %s@%s-%d\n",
02791                result, p->name, p->parent->name, sub ? sub->id:-1);
02792             mgcp_queue_hangup(p->sub);
02793          }
02794 
02795          if (p->sub->owner) {
02796             ast_log(LOG_NOTICE, "Terminating on result %d from %s@%s-%d\n",
02797                result, p->name, p->parent->name, sub ? sub->id:-1);
02798             mgcp_queue_hangup(p->sub);
02799          }
02800 
02801          dump_cmd_queues(p, NULL);
02802       }
02803    }
02804 
02805    if (resp) {
02806       /* responseAck: */
02807       if (result == 200 && (req->cmd == MGCP_CMD_CRCX || req->cmd == MGCP_CMD_MDCX)) {
02808             if (sub) {
02809                transmit_response(sub, "000", resp, "OK");
02810                if (sub->owner && sub->owner->_state == AST_STATE_RINGING) {
02811                   ast_queue_control(sub->owner, AST_CONTROL_RINGING);
02812                }
02813             }
02814       }
02815       if (req->cmd == MGCP_CMD_CRCX) {
02816          if ((c = get_header(resp, "I"))) {
02817             if (!ast_strlen_zero(c) && sub) {
02818                /* if we are hanging up do not process this conn. */
02819                if (sub->owner) {
02820                   if (!ast_strlen_zero(sub->cxident)) {
02821                      if (strcasecmp(c, sub->cxident)) {
02822                         ast_log(LOG_WARNING, "Subchannel already has a cxident. sub->cxident: %s requested %s\n", sub->cxident, c);
02823                      }
02824                   }
02825                   ast_copy_string(sub->cxident, c, sizeof(sub->cxident));
02826                   if (sub->tmpdest.sin_addr.s_addr) {
02827                      transmit_modify_with_sdp(sub, NULL, 0);
02828                   }
02829                } else {
02830                   /* XXX delete this one
02831                      callid and conn id may already be lost.
02832                      so the following del conn may have a side effect of
02833                      cleaning up the next subchannel */
02834                   transmit_connection_del(sub);
02835                }
02836             }
02837          }
02838       }
02839 
02840       if (req->cmd == MGCP_CMD_AUEP) {
02841          /* check stale connection ids */
02842          if ((c = get_header(resp, "I"))) {
02843             char *v, *n;
02844             int len;
02845             while ((v = get_csv(c, &len, &n))) {
02846                if (len) {
02847                   if (strncasecmp(v, p->sub->cxident, len) &&
02848                       strncasecmp(v, p->sub->next->cxident, len)) {
02849                      /* connection id not found. delete it */
02850                      char cxident[80] = "";
02851 
02852                      if (len > (sizeof(cxident) - 1))
02853                         len = sizeof(cxident) - 1;
02854                      ast_copy_string(cxident, v, len);
02855                      ast_verb(3, "Non existing connection id %s on %s@%s \n",
02856                                cxident, p->name, gw->name);
02857                      transmit_connection_del_w_params(p, NULL, cxident);
02858                   }
02859                }
02860                c = n;
02861             }
02862          }
02863 
02864          /* Try to determine the hookstate returned from an audit endpoint command */
02865          if ((c = get_header(resp, "ES"))) {
02866             if (!ast_strlen_zero(c)) {
02867                if (strstr(c, "hu")) {
02868                   if (p->hookstate != MGCP_ONHOOK) {
02869                      /* XXX cleanup if we think we are offhook XXX */
02870                      if ((p->sub->owner || p->sub->next->owner ) &&
02871                          p->hookstate == MGCP_OFFHOOK)
02872                         mgcp_queue_hangup(sub);
02873                      p->hookstate = MGCP_ONHOOK;
02874 
02875                      /* update the requested events according to the new hookstate */
02876                      transmit_notify_request(p->sub, "");
02877 
02878                      ast_verb(3, "Setting hookstate of %s@%s to ONHOOK\n", p->name, gw->name);
02879                      }
02880                } else if (strstr(c, "hd")) {
02881                   if (p->hookstate != MGCP_OFFHOOK) {
02882                      p->hookstate = MGCP_OFFHOOK;
02883 
02884                      /* update the requested events according to the new hookstate */
02885                      transmit_notify_request(p->sub, "");
02886 
02887                      ast_verb(3, "Setting hookstate of %s@%s to OFFHOOK\n", p->name, gw->name);
02888                      }
02889                   }
02890                }
02891             }
02892          }
02893 
02894       if (resp && resp->lines) {
02895          /* do not process sdp if we are hanging up. this may be a late response */
02896          if (sub && sub->owner) {
02897             if (!sub->rtp)
02898                start_rtp(sub);
02899             if (sub->rtp)
02900                process_sdp(sub, resp);
02901          }
02902       }
02903    }
02904 
02905    ast_free(req);
02906 }
02907 
02908 static void start_rtp(struct mgcp_subchannel *sub)
02909 {
02910    struct ast_sockaddr bindaddr_tmp;
02911 
02912    ast_mutex_lock(&sub->lock);
02913    /* check again to be on the safe side */
02914    if (sub->rtp) {
02915       ast_rtp_instance_destroy(sub->rtp);
02916       sub->rtp = NULL;
02917    }
02918    /* Allocate the RTP now */
02919    ast_sockaddr_from_sin(&bindaddr_tmp, &bindaddr);
02920    sub->rtp = ast_rtp_instance_new("asterisk", sched, &bindaddr_tmp, NULL);
02921    if (sub->rtp && sub->owner)
02922       ast_channel_set_fd(sub->owner, 0, ast_rtp_instance_fd(sub->rtp, 0));
02923    if (sub->rtp) {
02924       ast_rtp_instance_set_qos(sub->rtp, qos.tos_audio, qos.cos_audio, "MGCP RTP");
02925       ast_rtp_instance_set_prop(sub->rtp, AST_RTP_PROPERTY_NAT, sub->nat);
02926    }
02927    /* Make a call*ID */
02928    snprintf(sub->callid, sizeof(sub->callid), "%08lx%s", ast_random(), sub->txident);
02929    /* Transmit the connection create */
02930    if(!sub->parent->pktcgatealloc) {
02931       transmit_connect_with_sdp(sub, NULL);
02932    } else {
02933       transmit_connect(sub);
02934       sub->gate = NULL;
02935       if(!mgcp_alloc_pktcgate(sub))
02936          mgcp_queue_hangup(sub);
02937    }
02938    ast_mutex_unlock(&sub->lock);
02939 }
02940 
02941 static void *mgcp_ss(void *data)
02942 {
02943    struct ast_channel *chan = data;
02944    struct mgcp_subchannel *sub = chan->tech_pvt;
02945    struct mgcp_endpoint *p = sub->parent;
02946    /* char exten[AST_MAX_EXTENSION] = ""; */
02947    int len = 0;
02948    int timeout = firstdigittimeout;
02949    int res= 0;
02950    int getforward = 0;
02951    int loop_pause = 100;
02952 
02953    len = strlen(p->dtmf_buf);
02954 
02955    while (len < AST_MAX_EXTENSION - 1) {
02956       ast_debug(1, "Dtmf buffer '%s' for '%s@%s'\n", p->dtmf_buf, p->name, p->parent->name);
02957       res = 1;  /* Assume that we will get a digit */
02958       while (strlen(p->dtmf_buf) == len) {
02959          ast_safe_sleep(chan, loop_pause);
02960          timeout -= loop_pause;
02961          if (timeout <= 0){
02962             res = 0;
02963             break;
02964          }
02965          res = 1;
02966       }
02967 
02968       timeout = 0;
02969       len = strlen(p->dtmf_buf);
02970 
02971       if (!ast_ignore_pattern(chan->context, p->dtmf_buf)) {
02972          /*res = tone_zone_play_tone(p->subs[index].zfd, -1);*/
02973          ast_indicate(chan, -1);
02974       } else {
02975          /* XXX Redundant?  We should already be playing dialtone */
02976          /*tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALTONE);*/
02977          transmit_notify_request(sub, "L/dl");
02978       }
02979       if (ast_exists_extension(chan, chan->context, p->dtmf_buf, 1, p->cid_num)) {
02980          if (!res || !ast_matchmore_extension(chan, chan->context, p->dtmf_buf, 1, p->cid_num)) {
02981             if (getforward) {
02982                /* Record this as the forwarding extension */
02983                ast_copy_string(p->call_forward, p->dtmf_buf, sizeof(p->call_forward));
02984                ast_verb(3, "Setting call forward to '%s' on channel %s\n",
02985                      p->call_forward, chan->name);
02986                /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
02987                transmit_notify_request(sub, "L/sl");
02988                if (res)
02989                   break;
02990                usleep(500000);
02991                /*res = tone_zone_play_tone(p->subs[index].zfd, -1);*/
02992                ast_indicate(chan, -1);
02993                sleep(1);
02994                memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02995                /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALTONE);*/
02996                transmit_notify_request(sub, "L/dl");
02997                len = 0;
02998                getforward = 0;
02999             } else {
03000                /*res = tone_zone_play_tone(p->subs[index].zfd, -1);*/
03001                ast_indicate(chan, -1);
03002                ast_copy_string(chan->exten, p->dtmf_buf, sizeof(chan->exten));
03003                chan->dialed.number.str = ast_strdup(p->dtmf_buf);
03004                memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03005                ast_set_callerid(chan,
03006                   p->hidecallerid ? "" : p->cid_num,
03007                   p->hidecallerid ? "" : p->cid_name,
03008                   chan->caller.ani.number.valid ? NULL : p->cid_num);
03009                ast_setstate(chan, AST_STATE_RING);
03010                /*dahdi_enable_ec(p);*/
03011                if (p->dtmfmode & MGCP_DTMF_HYBRID) {
03012                   p->dtmfmode |= MGCP_DTMF_INBAND;
03013                   ast_indicate(chan, -1);
03014                }
03015                res = ast_pbx_run(chan);
03016                if (res) {
03017                   ast_log(LOG_WARNING, "PBX exited non-zero\n");
03018                   /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_CONGESTION);*/
03019                   /*transmit_notify_request(p, "nbz", 1);*/
03020                   transmit_notify_request(sub, p->ncs ? "L/cg" : "G/cg");
03021                }
03022                return NULL;
03023             }
03024          } else {
03025             /* It's a match, but they just typed a digit, and there is an ambiguous match,
03026                so just set the timeout to matchdigittimeout and wait some more */
03027             timeout = matchdigittimeout;
03028          }
03029       } else if (res == 0) {
03030          ast_debug(1, "not enough digits (and no ambiguous match)...\n");
03031          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_CONGESTION);*/
03032          transmit_notify_request(sub, p->ncs ? "L/cg" : "G/cg");
03033          /*dahdi_wait_event(p->subs[index].zfd);*/
03034          ast_hangup(chan);
03035          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03036          return NULL;
03037       } else if (p->hascallwaiting && p->callwaiting && !strcmp(p->dtmf_buf, "*70")) {
03038          ast_verb(3, "Disabling call waiting on %s\n", chan->name);
03039          /* Disable call waiting if enabled */
03040          p->callwaiting = 0;
03041          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
03042          transmit_notify_request(sub, "L/sl");
03043          len = 0;
03044          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03045          timeout = firstdigittimeout;
03046       } else if (!strcmp(p->dtmf_buf,ast_pickup_ext())) {
03047          /* Scan all channels and see if any there
03048           * ringing channqels with that have call groups
03049           * that equal this channels pickup group
03050           */
03051          if (ast_pickup_call(chan)) {
03052             ast_log(LOG_WARNING, "No call pickup possible...\n");
03053             /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_CONGESTION);*/
03054             transmit_notify_request(sub, p->ncs ? "L/cg" : "G/cg");
03055          }
03056          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03057          ast_hangup(chan);
03058          return NULL;
03059       } else if (!p->hidecallerid && !strcmp(p->dtmf_buf, "*67")) {
03060          ast_verb(3, "Disabling Caller*ID on %s\n", chan->name);
03061          /* Disable Caller*ID if enabled */
03062          p->hidecallerid = 1;
03063          ast_set_callerid(chan, "", "", NULL);
03064          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
03065          transmit_notify_request(sub, "L/sl");
03066          len = 0;
03067          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03068          timeout = firstdigittimeout;
03069       } else if (p->callreturn && !strcmp(p->dtmf_buf, "*69")) {
03070          res = 0;
03071          if (!ast_strlen_zero(p->lastcallerid)) {
03072             res = ast_say_digit_str(chan, p->lastcallerid, "", chan->language);
03073          }
03074          if (!res)
03075             /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
03076             transmit_notify_request(sub, "L/sl");
03077          break;
03078       } else if (!strcmp(p->dtmf_buf, "*78")) {
03079          /* Do not disturb */
03080          ast_verb(3, "Enabled DND on channel %s\n", chan->name);
03081          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
03082          transmit_notify_request(sub, "L/sl");
03083          p->dnd = 1;
03084          getforward = 0;
03085          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03086          len = 0;
03087       } else if (!strcmp(p->dtmf_buf, "*79")) {
03088          /* Do not disturb */
03089          ast_verb(3, "Disabled DND on channel %s\n", chan->name);
03090          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
03091          transmit_notify_request(sub, "L/sl");
03092          p->dnd = 0;
03093          getforward = 0;
03094          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03095          len = 0;
03096       } else if (p->cancallforward && !strcmp(p->dtmf_buf, "*72")) {
03097          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
03098          transmit_notify_request(sub, "L/sl");
03099          getforward = 1;
03100          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03101          len = 0;
03102       } else if (p->cancallforward && !strcmp(p->dtmf_buf, "*73")) {
03103          ast_verb(3, "Cancelling call forwarding on channel %s\n", chan->name);
03104          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
03105          transmit_notify_request(sub, "L/sl");
03106          memset(p->call_forward, 0, sizeof(p->call_forward));
03107          getforward = 0;
03108          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03109          len = 0;
03110       } else if (ast_parking_ext_valid(p->dtmf_buf, chan, chan->context) &&
03111          sub->next->owner && ast_bridged_channel(sub->next->owner)) {
03112          /* This is a three way call, the main call being a real channel,
03113             and we're parking the first call. */
03114          ast_masq_park_call(ast_bridged_channel(sub->next->owner), chan, 0, NULL);
03115          ast_verb(3, "Parking call to '%s'\n", chan->name);
03116          break;
03117       } else if (!ast_strlen_zero(p->lastcallerid) && !strcmp(p->dtmf_buf, "*60")) {
03118          ast_verb(3, "Blacklisting number %s\n", p->lastcallerid);
03119          res = ast_db_put("blacklist", p->lastcallerid, "1");
03120          if (!res) {
03121             /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
03122             transmit_notify_request(sub, "L/sl");
03123             memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03124             len = 0;
03125          }
03126       } else if (p->hidecallerid && !strcmp(p->dtmf_buf, "*82")) {
03127          ast_verb(3, "Enabling Caller*ID on %s\n", chan->name);
03128          /* Enable Caller*ID if enabled */
03129          p->hidecallerid = 0;
03130          ast_set_callerid(chan, p->cid_num, p->cid_name, NULL);
03131          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
03132          transmit_notify_request(sub, "L/sl");
03133          len = 0;
03134          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03135          timeout = firstdigittimeout;
03136       } else if (!ast_canmatch_extension(chan, chan->context, p->dtmf_buf, 1,
03137          S_COR(chan->caller.id.number.valid, chan->caller.id.number.str, NULL))
03138          && ((p->dtmf_buf[0] != '*') || (strlen(p->dtmf_buf) > 2))) {
03139          ast_debug(1, "Can't match %s from '%s' in context %s\n", p->dtmf_buf,
03140             S_COR(chan->caller.id.number.valid, chan->caller.id.number.str, "<Unknown Caller>"),
03141             chan->context);
03142          break;
03143       }
03144       if (!timeout)
03145          timeout = gendigittimeout;
03146       if (len && !ast_ignore_pattern(chan->context, p->dtmf_buf))
03147          /*tone_zone_play_tone(p->subs[index].zfd, -1);*/
03148          ast_indicate(chan, -1);
03149    }
03150 #if 0
03151    for (;;) {
03152       res = ast_waitfordigit(chan, to);
03153       if (!res) {
03154          ast_debug(1, "Timeout...\n");
03155          break;
03156       }
03157       if (res < 0) {
03158          ast_debug(1, "Got hangup...\n");
03159          ast_hangup(chan);
03160          break;
03161       }
03162       exten[pos++] = res;
03163       if (!ast_ignore_pattern(chan->context, exten))
03164          ast_indicate(chan, -1);
03165       if (ast_matchmore_extension(chan, chan->context, exten, 1, chan->callerid)) {
03166          if (ast_exists_extension(chan, chan->context, exten, 1, chan->callerid))
03167             to = 3000;
03168          else
03169             to = 8000;
03170       } else
03171          break;
03172    }
03173    if (ast_exists_extension(chan, chan->context, exten, 1, chan->callerid)) {
03174       ast_copy_string(chan->exten, exten, sizeof(chan->exten)1);
03175       if (!p->rtp) {
03176          start_rtp(p);
03177       }
03178       ast_setstate(chan, AST_STATE_RING);
03179       chan->rings = 1;
03180       if (ast_pbx_run(chan)) {
03181          ast_log(LOG_WARNING, "Unable to launch PBX on %s\n", chan->name);
03182       } else {
03183          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03184          return NULL;
03185       }
03186    }
03187 #endif
03188    ast_hangup(chan);
03189    memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03190    return NULL;
03191 }
03192 
03193 static int attempt_transfer(struct mgcp_endpoint *p)
03194 {
03195    /* *************************
03196     * I hope this works.
03197     * Copied out of chan_zap
03198     * Cross your fingers
03199     * *************************/
03200 
03201    /* In order to transfer, we need at least one of the channels to
03202       actually be in a call bridge.  We can't conference two applications
03203       together (but then, why would we want to?) */
03204    if (ast_bridged_channel(p->sub->owner)) {
03205       /* The three-way person we're about to transfer to could still be in MOH, so
03206          stop if now if appropriate */
03207       if (ast_bridged_channel(p->sub->next->owner))
03208          ast_queue_control(p->sub->next->owner, AST_CONTROL_UNHOLD);
03209       if (p->sub->owner->_state == AST_STATE_RINGING) {
03210          ast_indicate(ast_bridged_channel(p->sub->next->owner), AST_CONTROL_RINGING);
03211       }
03212       if (ast_channel_masquerade(p->sub->next->owner, ast_bridged_channel(p->sub->owner))) {
03213          ast_log(LOG_WARNING, "Unable to masquerade %s as %s\n",
03214             ast_bridged_channel(p->sub->owner)->name, p->sub->next->owner->name);
03215          return -1;
03216       }
03217       /* Orphan the channel */
03218       unalloc_sub(p->sub->next);
03219    } else if (ast_bridged_channel(p->sub->next->owner)) {
03220       if (p->sub->owner->_state == AST_STATE_RINGING) {
03221          ast_indicate(ast_bridged_channel(p->sub->next->owner), AST_CONTROL_RINGING);
03222       }
03223       ast_queue_control(p->sub->next->owner, AST_CONTROL_UNHOLD);
03224       if (ast_channel_masquerade(p->sub->owner, ast_bridged_channel(p->sub->next->owner))) {
03225          ast_log(LOG_WARNING, "Unable to masquerade %s as %s\n",
03226             ast_bridged_channel(p->sub->next->owner)->name, p->sub->owner->name);
03227          return -1;
03228       }
03229       /*swap_subs(p, SUB_THREEWAY, SUB_REAL);*/
03230       ast_verb(3, "Swapping %d for %d on %s@%s\n", p->sub->id, p->sub->next->id, p->name, p->parent->name);
03231       p->sub = p->sub->next;
03232       unalloc_sub(p->sub->next);
03233       /* Tell the caller not to hangup */
03234       return 1;
03235    } else {
03236       ast_debug(1, "Neither %s nor %s are in a bridge, nothing to transfer\n",
03237          p->sub->owner->name, p->sub->next->owner->name);
03238       p->sub->next->owner->_softhangup |= AST_SOFTHANGUP_DEV;
03239       if (p->sub->next->owner) {
03240          p->sub->next->alreadygone = 1;
03241          mgcp_queue_hangup(p->sub->next);
03242       }
03243    }
03244    return 0;
03245 }
03246 
03247 static void handle_hd_hf(struct mgcp_subchannel *sub, char *ev)
03248 {
03249    struct mgcp_endpoint *p = sub->parent;
03250    struct ast_channel *c;
03251    pthread_t t;
03252 
03253    /* Off hook / answer */
03254    if (sub->outgoing) {
03255       /* Answered */
03256       if (sub->owner) {
03257          if (ast_bridged_channel(sub->owner))
03258             ast_queue_control(sub->owner, AST_CONTROL_UNHOLD);
03259          sub->cxmode = MGCP_CX_SENDRECV;
03260          if (!sub->rtp) {
03261             start_rtp(sub);
03262          } else {
03263             transmit_modify_request(sub);
03264          }
03265          /*transmit_notify_request(sub, "aw");*/
03266          transmit_notify_request(sub, "");
03267          mgcp_queue_control(sub, AST_CONTROL_ANSWER);
03268       }
03269    } else {
03270       /* Start switch */
03271       /*sub->cxmode = MGCP_CX_SENDRECV;*/
03272       if (!sub->owner) {
03273          if (!sub->rtp) {
03274             start_rtp(sub);
03275          } else {
03276             transmit_modify_request(sub);
03277          }
03278          if (p->immediate) {
03279             /* The channel is immediately up. Start right away */
03280 #ifdef DLINK_BUGGY_FIRMWARE
03281             transmit_notify_request(sub, "rt");
03282 #else
03283             transmit_notify_request(sub, p->ncs ? "L/rt" : "G/rt");
03284 #endif
03285             c = mgcp_new(sub, AST_STATE_RING, NULL);
03286             if (!c) {
03287                ast_log(LOG_WARNING, "Unable to start PBX on channel %s@%s\n", p->name, p->parent->name);
03288                transmit_notify_request(sub, p->ncs ? "L/cg" : "G/cg");
03289                ast_hangup(c);
03290             }
03291          } else {
03292             if (has_voicemail(p)) {
03293                transmit_notify_request(sub, "L/sl");
03294             } else {
03295                transmit_notify_request(sub, "L/dl");
03296             }
03297             c = mgcp_new(sub, AST_STATE_DOWN, NULL);
03298             if (c) {
03299                if (ast_pthread_create_detached(&t, NULL, mgcp_ss, c)) {
03300                   ast_log(LOG_WARNING, "Unable to create switch thread: %s\n", strerror(errno));
03301                   ast_hangup(c);
03302                }
03303             } else {
03304                ast_log(LOG_WARNING, "Unable to create channel for %s@%s\n", p->name, p->parent->name);
03305             }
03306          }
03307       } else {
03308          if (p->hookstate == MGCP_OFFHOOK) {
03309             ast_log(LOG_WARNING, "Off hook, but already have owner on %s@%s\n", p->name, p->parent->name);
03310          } else {
03311             ast_log(LOG_WARNING, "On hook, but already have owner on %s@%s\n", p->name, p->parent->name);
03312             ast_log(LOG_WARNING, "If we're onhook why are we here trying to handle a hd or hf?\n");
03313          }
03314          if (ast_bridged_channel(sub->owner))
03315             ast_queue_control(sub->owner, AST_CONTROL_UNHOLD);
03316          sub->cxmode = MGCP_CX_SENDRECV;
03317          if (!sub->rtp) {
03318             start_rtp(sub);
03319          } else {
03320             transmit_modify_request(sub);
03321          }
03322          /*transmit_notify_request(sub, "aw");*/
03323          transmit_notify_request(sub, "");
03324          /*ast_queue_control(sub->owner, AST_CONTROL_ANSWER);*/
03325       }
03326    }
03327 }
03328 
03329 static int handle_request(struct mgcp_subchannel *sub, struct mgcp_request *req, struct sockaddr_in *sin)
03330 {
03331    char *ev, *s;
03332    struct ast_frame f = { 0, };
03333    struct mgcp_endpoint *p = sub->parent;
03334    struct mgcp_gateway *g = NULL;
03335    int res;
03336 
03337    ast_debug(1, "Handling request '%s' on %s@%s\n", req->verb, p->name, p->parent->name);
03338    /* Clear out potential response */
03339    if (!strcasecmp(req->verb, "RSIP")) {
03340       /* Test if this RSIP request is just a keepalive */
03341       if (!strcasecmp( get_header(req, "RM"), "X-keepalive")) {
03342          ast_verb(3, "Received keepalive request from %s@%s\n", p->name, p->parent->name);
03343          transmit_response(sub, "200", req, "OK");
03344       } else {
03345          dump_queue(p->parent, p);
03346          dump_cmd_queues(p, NULL);
03347 
03348          if ((strcmp(p->name, p->parent->wcardep) != 0)) {
03349             ast_verb(3, "Resetting interface %s@%s\n", p->name, p->parent->name);
03350          }
03351          /* For RSIP on wildcard we reset all endpoints */
03352          if (!strcmp(p->name, p->parent->wcardep)) {
03353             /* Reset all endpoints */
03354             struct mgcp_endpoint *tmp_ep;
03355 
03356             g = p->parent;
03357             for (tmp_ep = g->endpoints; tmp_ep; tmp_ep = tmp_ep->next) {
03358                /*if ((strcmp(tmp_ep->name, "*") != 0) && (strcmp(tmp_ep->name, "aaln/" "*") != 0)) {*/
03359                if (strcmp(tmp_ep->name, g->wcardep) != 0) {
03360                   struct mgcp_subchannel *tmp_sub, *first_sub;
03361                   ast_verb(3, "Resetting interface %s@%s\n", tmp_ep->name, p->parent->name);
03362 
03363                   first_sub = tmp_ep->sub;
03364                   tmp_sub = tmp_ep->sub;
03365                   while (tmp_sub) {
03366                      mgcp_queue_hangup(tmp_sub);
03367                      tmp_sub = tmp_sub->next;
03368                      if (tmp_sub == first_sub)
03369                         break;
03370                   }
03371                }
03372             }
03373          } else if (sub->owner) {
03374             mgcp_queue_hangup(sub);
03375          }
03376          transmit_response(sub, "200", req, "OK");
03377          /* We don't send NTFY or AUEP to wildcard ep */
03378          if (strcmp(p->name, p->parent->wcardep) != 0) {
03379             transmit_notify_request(sub, "");
03380             /* Audit endpoint.
03381              Idea is to prevent lost lines due to race conditions
03382             */
03383             transmit_audit_endpoint(p);
03384          }
03385       }
03386    } else if (!strcasecmp(req->verb, "NTFY")) {
03387       /* Acknowledge and be sure we keep looking for the same things */
03388       transmit_response(sub, "200", req, "OK");
03389       /* Notified of an event */
03390       ev = get_header(req, "O");
03391       s = strchr(ev, '/');
03392       if (s) ev = s + 1;
03393       ast_debug(1, "Endpoint '%s@%s-%d' observed '%s'\n", p->name, p->parent->name, sub->id, ev);
03394       /* Keep looking for events unless this was a hangup */
03395       if (strcasecmp(ev, "hu") && strcasecmp(ev, "hd") && strcasecmp(ev, "ping")) {
03396          transmit_notify_request(sub, p->curtone);
03397       }
03398       if (!strcasecmp(ev, "hd")) {
03399          p->hookstate = MGCP_OFFHOOK;
03400          sub->cxmode = MGCP_CX_SENDRECV;
03401 
03402          if (p) {
03403            /* When the endpoint have a Off hook transition we allways
03404               starts without any previous dtmfs */
03405            memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
03406          }
03407 
03408          handle_hd_hf(sub, ev);
03409       } else if (!strcasecmp(ev, "hf")) {
03410          /* We can assume we are offhook if we received a hookflash */
03411          /* First let's just do call wait and ignore threeway */
03412          /* We're currently in charge */
03413          if (p->hookstate != MGCP_OFFHOOK) {
03414             /* Cisco c7940 sends hf even if the phone is onhook */
03415             /* Thanks to point on IRC for pointing this out */
03416             return -1;
03417          }
03418          /* do not let * conference two down channels */
03419          if (sub->owner && sub->owner->_state == AST_STATE_DOWN && !sub->next->owner)
03420             return -1;
03421 
03422          if (p->callwaiting || p->transfer || p->threewaycalling) {
03423             ast_verb(3, "Swapping %d for %d on %s@%s\n", p->sub->id, p->sub->next->id, p->name, p->parent->name);
03424             p->sub = p->sub->next;
03425 
03426             /* transfer control to our next subchannel */
03427             if (!sub->next->owner) {
03428                /* plave the first call on hold and start up a new call */
03429                sub->cxmode = MGCP_CX_MUTE;
03430                ast_verb(3, "MGCP Muting %d on %s@%s\n", sub->id, p->name, p->parent->name);
03431                transmit_modify_request(sub);
03432                if (sub->owner && ast_bridged_channel(sub->owner))
03433                   ast_queue_control(sub->owner, AST_CONTROL_HOLD);
03434                sub->next->cxmode = MGCP_CX_RECVONLY;
03435                handle_hd_hf(sub->next, ev);
03436             } else if (sub->owner && sub->next->owner) {
03437                /* We've got two active calls lets decide whether or not to conference or just flip flop */
03438                if ((!sub->outgoing) && (!sub->next->outgoing)) {
03439                   /* We made both calls lets conferenct */
03440                   ast_verb(3, "MGCP Conferencing %d and %d on %s@%s\n",
03441                         sub->id, sub->next->id, p->name, p->parent->name);
03442                   sub->cxmode = MGCP_CX_CONF;
03443                   sub->next->cxmode = MGCP_CX_CONF;
03444                   if (ast_bridged_channel(sub->next->owner))
03445                      ast_queue_control(sub->next->owner, AST_CONTROL_UNHOLD);
03446                   transmit_modify_request(sub);
03447                   transmit_modify_request(sub->next);
03448                } else {
03449                   /* Let's flipflop between calls */
03450                   /* XXX Need to check for state up ??? */
03451                   /* XXX Need a way to indicate the current call, or maybe the call that's waiting */
03452                   ast_verb(3, "We didn't make one of the calls FLIPFLOP %d and %d on %s@%s\n",
03453                         sub->id, sub->next->id, p->name, p->parent->name);
03454                   sub->cxmode = MGCP_CX_MUTE;
03455                   ast_verb(3, "MGCP Muting %d on %s@%s\n", sub->id, p->name, p->parent->name);
03456                   transmit_modify_request(sub);
03457                   if (ast_bridged_channel(sub->owner))
03458                      ast_queue_control(sub->owner, AST_CONTROL_HOLD);
03459 
03460                   if (ast_bridged_channel(sub->next->owner))
03461                      ast_queue_control(sub->next->owner, AST_CONTROL_HOLD);
03462 
03463                   handle_hd_hf(sub->next, ev);
03464                }
03465             } else {
03466                /* We've most likely lost one of our calls find an active call and bring it up */
03467                if (sub->owner) {
03468                   p->sub = sub;
03469                } else if (sub->next->owner) {
03470                   p->sub = sub->next;
03471                } else {
03472                   /* We seem to have lost both our calls */
03473                   /* XXX - What do we do now? */
03474                   return -1;
03475                }
03476                if (ast_bridged_channel(p->sub->owner))
03477                   ast_queue_control(p->sub->owner, AST_CONTROL_UNHOLD);
03478                p->sub->cxmode = MGCP_CX_SENDRECV;
03479                transmit_modify_request(p->sub);
03480             }
03481          } else {
03482             ast_log(LOG_WARNING, "Callwaiting, call transfer or threeway calling not enabled on endpoint %s@%s\n",
03483                p->name, p->parent->name);
03484          }
03485       } else if (!strcasecmp(ev, "hu")) {
03486          p->hookstate = MGCP_ONHOOK;
03487          sub->cxmode = MGCP_CX_RECVONLY;
03488          ast_debug(1, "MGCP %s@%s Went on hook\n", p->name, p->parent->name);
03489          /* Do we need to send MDCX before a DLCX ?
03490          if (sub->rtp) {
03491             transmit_modify_request(sub);
03492          }
03493          */
03494          if (p->transfer && (sub->owner && sub->next->owner) && ((!sub->outgoing) || (!sub->next->outgoing))) {
03495             /* We're allowed to transfer, we have two avtive calls and */
03496             /* we made at least one of the calls.  Let's try and transfer */
03497             ast_mutex_lock(&p->sub->next->lock);
03498             res = attempt_transfer(p);
03499             if (res < 0) {
03500                if (p->sub->next->owner) {
03501                   sub->next->alreadygone = 1;
03502                   mgcp_queue_hangup(sub->next);
03503                }
03504             } else if (res) {
03505                ast_log(LOG_WARNING, "Transfer attempt failed\n");
03506                ast_mutex_unlock(&p->sub->next->lock);
03507                return -1;
03508             }
03509             ast_mutex_unlock(&p->sub->next->lock);
03510          } else {
03511             /* Hangup the current call */
03512             /* If there is another active call, mgcp_hangup will ring the phone with the other call */
03513             if (sub->owner) {
03514                sub->alreadygone = 1;
03515                mgcp_queue_hangup(sub);
03516             } else {
03517                ast_verb(3, "MGCP handle_request(%s@%s-%d) ast_channel already destroyed, resending DLCX.\n",
03518                      p->name, p->parent->name, sub->id);
03519                /* Instruct the other side to remove the connection since it apparently *
03520                 * still thinks the channel is active. *
03521                 * For Cisco IAD2421 /BAK/ */
03522                transmit_connection_del(sub);
03523             }
03524          }
03525          if ((p->hookstate == MGCP_ONHOOK) && (!sub->rtp) && (!sub->next->rtp)) {
03526             p->hidecallerid = 0;
03527             if (p->hascallwaiting && !p->callwaiting) {
03528                ast_verb(3, "Enabling call waiting on MGCP/%s@%s-%d\n", p->name, p->parent->name, sub->id);
03529                p->callwaiting = -1;
03530             }
03531             if (has_voicemail(p)) {
03532                ast_verb(3, "MGCP handle_request(%s@%s) set vmwi(+)\n", p->name, p->parent->name);
03533                transmit_notify_request(sub, "L/vmwi(+)");
03534             } else {
03535                ast_verb(3, "MGCP handle_request(%s@%s) set vmwi(-)\n", p->name, p->parent->name);
03536                transmit_notify_request(sub, "L/vmwi(-)");
03537             }
03538          }
03539       } else if ((strlen(ev) == 1) &&
03540             (((ev[0] >= '0') && (ev[0] <= '9')) ||
03541              ((ev[0] >= 'A') && (ev[0] <= 'D')) ||
03542               (ev[0] == '*') || (ev[0] == '#'))) {
03543          if (sub && sub->owner && (sub->owner->_state >=  AST_STATE_UP)) {
03544             f.frametype = AST_FRAME_DTMF;
03545             f.subclass.integer = ev[0];
03546             f.src = "mgcp";
03547             /* XXX MUST queue this frame to all subs in threeway call if threeway call is active */
03548             mgcp_queue_frame(sub, &f);
03549             ast_mutex_lock(&sub->next->lock);
03550             if (sub->next->owner)
03551                mgcp_queue_frame(sub->next, &f);
03552             ast_mutex_unlock(&sub->next->lock);
03553             if (strstr(p->curtone, (p->ncs ? "wt1" : "wt")) && (ev[0] == 'A')) {
03554                memset(p->curtone, 0, sizeof(p->curtone));
03555             }
03556          } else {
03557             p->dtmf_buf[strlen(p->dtmf_buf)] = ev[0];
03558             p->dtmf_buf[strlen(p->dtmf_buf)] = '\0';
03559          }
03560       } else if (!strcasecmp(ev, "T")) {
03561          /* Digit timeout -- unimportant */
03562       } else if (!strcasecmp(ev, "ping")) {
03563          /* ping -- unimportant */
03564       } else {
03565          ast_log(LOG_NOTICE, "Received unknown event '%s' from %s@%s\n", ev, p->name, p->parent->name);
03566       }
03567    } else {
03568       ast_log(LOG_WARNING, "Unknown verb '%s' received from %s\n", req->verb, ast_inet_ntoa(sin->sin_addr));
03569       transmit_response(sub, "510", req, "Unknown verb");
03570    }
03571    return 0;
03572 }
03573 
03574 static int find_and_retrans(struct mgcp_subchannel *sub, struct mgcp_request *req)
03575 {
03576    int seqno=0;
03577    time_t now;
03578    struct mgcp_response *prev = NULL, *cur, *next, *answer = NULL;
03579    time(&now);
03580    if (sscanf(req->identifier, "%30d", &seqno) != 1) {
03581       seqno = 0;
03582    }
03583    for (cur = sub->parent->parent->responses, next = cur ? cur->next : NULL; cur; cur = next, next = cur ? cur->next : NULL) {
03584       if (now - cur->whensent > RESPONSE_TIMEOUT) {
03585          /* Delete this entry */
03586          if (prev)
03587             prev->next = next;
03588          else
03589             sub->parent->parent->responses = next;
03590          ast_free(cur);
03591       } else {
03592          if (seqno == cur->seqno)
03593             answer = cur;
03594          prev = cur;
03595       }
03596    }
03597    if (answer) {
03598       resend_response(sub, answer);
03599       return 1;
03600    }
03601    return 0;
03602 }
03603 
03604 static int mgcpsock_read(int *id, int fd, short events, void *ignore)
03605 {
03606    struct mgcp_request req;
03607    struct sockaddr_in sin;
03608    struct mgcp_subchannel *sub;
03609    int res;
03610    socklen_t len;
03611    int result;
03612    int ident;
03613    len = sizeof(sin);
03614    memset(&req, 0, sizeof(req));
03615    res = recvfrom(mgcpsock, req.data, sizeof(req.data) - 1, 0, (struct sockaddr *)&sin, &len);
03616    if (res < 0) {
03617       if (errno != ECONNREFUSED)
03618          ast_log(LOG_WARNING, "Recv error: %s\n", strerror(errno));
03619       return 1;
03620    }
03621    req.data[res] = '\0';
03622    req.len = res;
03623    ast_debug(1, "MGCP read: \n%s\nfrom %s:%d\n", req.data, ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
03624    parse(&req);
03625    if (req.headers < 1) {
03626       /* Must have at least one header */
03627       return 1;
03628    }
03629    if (ast_strlen_zero(req.identifier)) {
03630       ast_log(LOG_NOTICE, "Message from %s missing identifier\n", ast_inet_ntoa(sin.sin_addr));
03631       return 1;
03632    }
03633 
03634    if (sscanf(req.verb, "%30d", &result) && sscanf(req.identifier, "%30d", &ident)) {
03635       if (result < 200) {
03636          ast_debug(1, "Ignoring provisional response on transaction %d\n", ident);
03637          return 1;
03638       }
03639       /* Try to find who this message is for, if it's important */
03640       sub = find_subchannel_and_lock(NULL, ident, &sin);
03641       if (sub) {
03642          struct mgcp_gateway *gw = sub->parent->parent;
03643          struct mgcp_message *cur, *prev;
03644 
03645          ast_mutex_unlock(&sub->lock);
03646          ast_mutex_lock(&gw->msgs_lock);
03647          for (prev = NULL, cur = gw->msgs; cur; prev = cur, cur = cur->next) {
03648             if (cur->seqno == ident) {
03649                ast_debug(1, "Got response back on transaction %d\n", ident);
03650                if (prev)
03651                   prev->next = cur->next;
03652                else
03653                   gw->msgs = cur->next;
03654                break;
03655             }
03656          }
03657 
03658          /* stop retrans timer if the queue is empty */
03659          if (!gw->msgs) {
03660             AST_SCHED_DEL(sched, gw->retransid);
03661          }
03662 
03663          ast_mutex_unlock(&gw->msgs_lock);
03664          if (cur) {
03665             handle_response(cur->owner_ep, cur->owner_sub, result, ident, &req);
03666             ast_free(cur);
03667             return 1;
03668          }
03669 
03670          ast_log(LOG_NOTICE, "Got response back on [%s] for transaction %d we aren't sending?\n",
03671             gw->name, ident);
03672       }
03673    } else {
03674       if (ast_strlen_zero(req.endpoint) ||
03675          ast_strlen_zero(req.version) ||
03676          ast_strlen_zero(req.verb)) {
03677          ast_log(LOG_NOTICE, "Message must have a verb, an idenitifier, version, and endpoint\n");
03678          return 1;
03679       }
03680       /* Process request, with iflock held */
03681       sub = find_subchannel_and_lock(req.endpoint, 0, &sin);
03682       if (sub) {
03683          /* look first to find a matching response in the queue */
03684          if (!find_and_retrans(sub, &req))
03685             /* pass the request off to the currently mastering subchannel */
03686             handle_request(sub, &req, &sin);
03687          ast_mutex_unlock(&sub->lock);
03688       }
03689    }
03690    return 1;
03691 }
03692 
03693 static int *mgcpsock_read_id = NULL;
03694 
03695 static int mgcp_prune_realtime_gateway(struct mgcp_gateway *g)
03696 {
03697    struct mgcp_endpoint *enext, *e;
03698    struct mgcp_subchannel *s, *sub;
03699    int i, prune = 1;
03700 
03701    if (g->ha || !g->realtime || ast_mutex_trylock(&g->msgs_lock) || g->msgs) {
03702       ast_mutex_unlock(&g->msgs_lock);
03703       return 0;
03704    }
03705 
03706    for (e = g->endpoints; e; e = e->next) {
03707       ast_mutex_lock(&e->lock);
03708       if (e->dsp || ast_mutex_trylock(&e->rqnt_queue_lock) || ast_mutex_trylock(&e->cmd_queue_lock)) {
03709          prune = 0;
03710       } else if (e->rqnt_queue || e->cmd_queue) {
03711          prune = 0;
03712       }
03713       s = e->sub;
03714       for (i = 0; (i < MAX_SUBS) && s; i++) {
03715          ast_mutex_lock(&s->lock);
03716          if (!ast_strlen_zero(s->cxident) || s->rtp || ast_mutex_trylock(&s->cx_queue_lock) || s->gate) {
03717             prune = 0;
03718          } else if (s->cx_queue) {
03719             prune = 0;
03720          }
03721          s = s->next;
03722       }
03723    }
03724 
03725    for (e = g->endpoints, sub = e->sub, enext = e->next; e; e = enext, enext = e->next) {
03726       for (i = 0; (i < MAX_SUBS) && sub; i++) {
03727          s = sub;
03728          sub = sub->next;
03729          ast_mutex_unlock(&s->lock);
03730          ast_mutex_unlock(&s->cx_queue_lock);
03731          if (prune) {
03732             ast_mutex_destroy(&s->lock);
03733             ast_mutex_destroy(&s->cx_queue_lock);
03734             free(s);
03735          }
03736       }
03737       ast_mutex_unlock(&e->lock);
03738       ast_mutex_unlock(&e->rqnt_queue_lock);
03739       ast_mutex_unlock(&e->cmd_queue_lock);
03740       if (prune) {
03741          ast_mutex_destroy(&e->lock);
03742          ast_mutex_destroy(&e->rqnt_queue_lock);
03743          ast_mutex_destroy(&e->cmd_queue_lock);
03744          free(e);
03745       }
03746    }
03747    if (prune) {
03748       ast_debug(1, "***** MGCP REALTIME PRUNE GW: %s\n", g->name);
03749    }
03750    return prune;
03751 }
03752 
03753 static void *do_monitor(void *data)
03754 {
03755    int res;
03756    int reloading;
03757    struct mgcp_gateway *g, *gprev, *gnext;
03758    /*struct mgcp_gateway *g;*/
03759    /*struct mgcp_endpoint *e;*/
03760    /*time_t thispass = 0, lastpass = 0;*/
03761    time_t lastrun = 0;
03762 
03763    /* Add an I/O event to our UDP socket */
03764    if (mgcpsock > -1) {
03765       mgcpsock_read_id = ast_io_add(io, mgcpsock, mgcpsock_read, AST_IO_IN, NULL);
03766    }
03767    /* This thread monitors all the frame relay interfaces which are not yet in use
03768       (and thus do not have a separate thread) indefinitely */
03769    /* From here on out, we die whenever asked */
03770    for (;;) {
03771       /* Check for a reload request */
03772       ast_mutex_lock(&mgcp_reload_lock);
03773       reloading = mgcp_reloading;
03774       mgcp_reloading = 0;
03775       ast_mutex_unlock(&mgcp_reload_lock);
03776       if (reloading) {
03777          ast_verb(1, "Reloading MGCP\n");
03778          reload_config(1);
03779          /* Add an I/O event to our UDP socket */
03780          if (mgcpsock > -1 && !mgcpsock_read_id) {
03781             mgcpsock_read_id = ast_io_add(io, mgcpsock, mgcpsock_read, AST_IO_IN, NULL);
03782          }
03783       }
03784 
03785       /* Check for interfaces needing to be killed */
03786       /* Don't let anybody kill us right away.  Nobody should lock the interface list
03787          and wait for the monitor list, but the other way around is okay. */
03788       ast_mutex_lock(&monlock);
03789       /* Lock the network interface */
03790       ast_mutex_lock(&netlock);
03791 
03792 #if 0
03793       /* XXX THIS IS COMPLETELY HOSED */
03794       /* The gateway goes into a state of panic */
03795       /* If the vmwi indicator is sent while it is reseting interfaces */
03796       lastpass = thispass;
03797       thispass = time(NULL);
03798       g = gateways;
03799       while(g) {
03800          if (thispass != lastpass) {
03801             e = g->endpoints;
03802             while(e) {
03803                if (e->type == TYPE_LINE) {
03804                   res = has_voicemail(e);
03805                   if ((e->msgstate != res) && (e->hookstate == MGCP_ONHOOK) && (!e->rtp)){
03806                      if (res) {
03807                         transmit_notify_request(e, "L/vmwi(+)");
03808                      } else {
03809                         transmit_notify_request(e, "L/vmwi(-)");
03810                      }
03811                      e->msgstate = res;
03812                      e->onhooktime = thispass;
03813                   }
03814                }
03815                e = e->next;
03816             }
03817          }
03818          g = g->next;
03819       }
03820 #endif
03821       /* pruning unused realtime gateways, running in every 60 seconds*/
03822       if(time(NULL) > (lastrun + 60)) {
03823          ast_mutex_lock(&gatelock);
03824          g = gateways;
03825          gprev = NULL;
03826          while(g) {
03827             gnext = g->next;
03828             if(g->realtime) {
03829                if(mgcp_prune_realtime_gateway(g)) {
03830                   if(gprev) {
03831                      gprev->next = gnext;
03832                      gprev = g;
03833                   } else {
03834                      gateways = g->next;
03835                   }
03836                   ast_mutex_unlock(&g->msgs_lock);
03837                   ast_mutex_destroy(&g->msgs_lock);
03838                   free(g);
03839                } else {
03840                   ast_mutex_unlock(&g->msgs_lock);
03841                   gprev = g;
03842                }
03843             } else {
03844                gprev = g;
03845             }
03846             g = gnext;
03847          }
03848          ast_mutex_unlock(&gatelock);
03849          lastrun = time(NULL);
03850       }
03851       /* Okay, now that we know what to do, release the network lock */
03852       ast_mutex_unlock(&netlock);
03853       /* And from now on, we're okay to be killed, so release the monitor lock as well */
03854       ast_mutex_unlock(&monlock);
03855       pthread_testcancel();
03856       /* Wait for sched or io */
03857       res = ast_sched_wait(sched);
03858       /* copied from chan_sip.c */
03859       if ((res < 0) || (res > 1000)) {
03860          res = 1000;
03861       }
03862       res = ast_io_wait(io, res);
03863       ast_mutex_lock(&monlock);
03864       if (res >= 0) {
03865          ast_sched_runq(sched);
03866       }
03867       ast_mutex_unlock(&monlock);
03868    }
03869    /* Never reached */
03870    return NULL;
03871 }
03872 
03873 static int restart_monitor(void)
03874 {
03875    /* If we're supposed to be stopped -- stay stopped */
03876    if (monitor_thread == AST_PTHREADT_STOP)
03877       return 0;
03878    if (ast_mutex_lock(&monlock)) {
03879       ast_log(LOG_WARNING, "Unable to lock monitor\n");
03880       return -1;
03881    }
03882    if (monitor_thread == pthread_self()) {
03883       ast_mutex_unlock(&monlock);
03884       ast_log(LOG_WARNING, "Cannot kill myself\n");
03885       return -1;
03886    }
03887    if (monitor_thread != AST_PTHREADT_NULL) {
03888       /* Wake up the thread */
03889       pthread_kill(monitor_thread, SIGURG);
03890    } else {
03891       /* Start a new monitor */
03892       if (ast_pthread_create_background(&monitor_thread, NULL, do_monitor, NULL) < 0) {
03893          ast_mutex_unlock(&monlock);
03894          ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
03895          return -1;
03896       }
03897    }
03898    ast_mutex_unlock(&monlock);
03899    return 0;
03900 }
03901 
03902 static struct ast_channel *mgcp_request(const char *type, format_t format, const struct ast_channel *requestor, void *data, int *cause)
03903 {
03904    format_t oldformat;
03905    struct mgcp_subchannel *sub;
03906    struct ast_channel *tmpc = NULL;
03907    char tmp[256];
03908    char *dest = data;
03909 
03910    oldformat = format;
03911    format &= capability;
03912    if (!format) {
03913       ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%s'\n", ast_getformatname_multiple(tmp, sizeof(tmp), format));
03914       /*return NULL;*/
03915    }
03916    ast_copy_string(tmp, dest, sizeof(tmp));
03917    if (ast_strlen_zero(tmp)) {
03918       ast_log(LOG_NOTICE, "MGCP Channels require an endpoint\n");
03919       return NULL;
03920    }
03921    if (!(sub = find_subchannel_and_lock(tmp, 0, NULL))) {
03922       ast_log(LOG_WARNING, "Unable to find MGCP endpoint '%s'\n", tmp);
03923       *cause = AST_CAUSE_UNREGISTERED;
03924       return NULL;
03925    }
03926 
03927    ast_verb(3, "MGCP mgcp_request(%s)\n", tmp);
03928    ast_verb(3, "MGCP cw: %d, dnd: %d, so: %d, sno: %d\n",
03929          sub->parent->callwaiting, sub->parent->dnd, sub->owner ? 1 : 0, sub->next->owner ? 1: 0);
03930    /* Must be busy */
03931    if (((sub->parent->callwaiting) && ((sub->owner) && (sub->next->owner))) ||
03932       ((!sub->parent->callwaiting) && (sub->owner)) ||
03933        (sub->parent->dnd && (ast_strlen_zero(sub->parent->call_forward)))) {
03934       if (sub->parent->hookstate == MGCP_ONHOOK) {
03935          if (has_voicemail(sub->parent)) {
03936             transmit_notify_request(sub,"L/vmwi(+)");
03937          } else {
03938             transmit_notify_request(sub,"L/vmwi(-)");
03939          }
03940       }
03941       *cause = AST_CAUSE_BUSY;
03942       ast_mutex_unlock(&sub->lock);
03943       return NULL;
03944    }
03945    tmpc = mgcp_new(sub->owner ? sub->next : sub, AST_STATE_DOWN, requestor ? requestor->linkedid : NULL);
03946    ast_mutex_unlock(&sub->lock);
03947    if (!tmpc)
03948       ast_log(LOG_WARNING, "Unable to make channel for '%s'\n", tmp);
03949    restart_monitor();
03950    return tmpc;
03951 }
03952 
03953 /* modified for reload support */
03954 /*! \brief  build_gateway: parse mgcp.conf and create gateway/endpoint structures */
03955 static struct mgcp_gateway *build_gateway(char *cat, struct ast_variable *v)
03956 {
03957    struct mgcp_gateway *gw;
03958    struct mgcp_endpoint *e;
03959    struct mgcp_subchannel *sub;
03960    struct ast_variable *chanvars = NULL;
03961 
03962    /*char txident[80];*/
03963    int i=0, y=0;
03964    int gw_reload = 0;
03965    int ep_reload = 0;
03966    directmedia = DIRECTMEDIA;
03967 
03968    /* locate existing gateway */
03969    for (gw = gateways; gw; gw = gw->next) {
03970       if (!strcasecmp(cat, gw->name)) {
03971          /* gateway already exists */
03972          gw->delme = 0;
03973          gw_reload = 1;
03974          break;
03975       }
03976    }
03977 
03978    if (!gw && !(gw = ast_calloc(1, sizeof(*gw)))) {
03979       return NULL;
03980    }
03981 
03982    if (!gw_reload) {
03983       gw->expire = -1;
03984       gw->realtime = 0;
03985       gw->retransid = -1;
03986       ast_mutex_init(&gw->msgs_lock);
03987       ast_copy_string(gw->name, cat, sizeof(gw->name));
03988       /* check if the name is numeric ip */
03989       if ((strchr(gw->name, '.')) && inet_addr(gw->name) != INADDR_NONE)
03990          gw->isnamedottedip = 1;
03991    }
03992    for (; v; v = v->next) {
03993       if (!strcasecmp(v->name, "host")) {
03994          if (!strcasecmp(v->value, "dynamic")) {
03995             /* They'll register with us */
03996             gw->dynamic = 1;
03997             memset(&gw->addr.sin_addr, 0, 4);
03998             if (gw->addr.sin_port) {
03999                /* If we've already got a port, make it the default rather than absolute */
04000                gw->defaddr.sin_port = gw->addr.sin_port;
04001                gw->addr.sin_port = 0;
04002             }
04003          } else {
04004             /* Non-dynamic.  Make sure we become that way if we're not */
04005             AST_SCHED_DEL(sched, gw->expire);
04006             gw->dynamic = 0;
04007             {
04008                struct ast_sockaddr tmp;
04009 
04010                ast_sockaddr_from_sin(&tmp, &gw->addr);
04011                if (ast_get_ip(&tmp, v->value)) {
04012                   if (!gw_reload) {
04013                      ast_mutex_destroy(&gw->msgs_lock);
04014                      ast_free(gw);
04015                   }
04016                   return NULL;
04017                }
04018                ast_sockaddr_to_sin(&tmp, &gw->addr);
04019             }
04020          }
04021       } else if (!strcasecmp(v->name, "defaultip")) {
04022          struct ast_sockaddr tmp;
04023 
04024          ast_sockaddr_from_sin(&tmp, &gw->defaddr);
04025          if (ast_get_ip(&tmp, v->value)) {
04026             if (!gw_reload) {
04027                ast_mutex_destroy(&gw->msgs_lock);
04028                ast_free(gw);
04029             }
04030             return NULL;
04031          }
04032          ast_sockaddr_to_sin(&tmp, &gw->defaddr);
04033       } else if (!strcasecmp(v->name, "permit") ||
04034          !strcasecmp(v->name, "deny")) {
04035          gw->ha = ast_append_ha(v->name, v->value, gw->ha, NULL);
04036       } else if (!strcasecmp(v->name, "port")) {
04037          gw->addr.sin_port = htons(atoi(v->value));
04038       } else if (!strcasecmp(v->name, "context")) {
04039          ast_copy_string(context, v->value, sizeof(context));
04040       } else if (!strcasecmp(v->name, "dtmfmode")) {
04041          if (!strcasecmp(v->value, "inband"))
04042             dtmfmode = MGCP_DTMF_INBAND;
04043          else if (!strcasecmp(v->value, "rfc2833"))
04044             dtmfmode = MGCP_DTMF_RFC2833;
04045          else if (!strcasecmp(v->value, "hybrid"))
04046             dtmfmode = MGCP_DTMF_HYBRID;
04047          else if (!strcasecmp(v->value, "none"))
04048             dtmfmode = 0;
04049          else
04050             ast_log(LOG_WARNING, "'%s' is not a valid DTMF mode at line %d\n", v->value, v->lineno);
04051       } else if (!strcasecmp(v->name, "nat")) {
04052          nat = ast_true(v->value);
04053       } else if (!strcasecmp(v->name, "ncs")) {
04054          ncs = ast_true(v->value);
04055       } else if (!strcasecmp(v->name, "hangupongateremove")) {
04056          hangupongateremove = ast_true(v->value);
04057       } else if (!strcasecmp(v->name, "pktcgatealloc")) {
04058          pktcgatealloc = ast_true(v->value);
04059       } else if (!strcasecmp(v->name, "callerid")) {
04060          if (!strcasecmp(v->value, "asreceived")) {
04061             cid_num[0] = '\0';
04062             cid_name[0] = '\0';
04063          } else {
04064             ast_callerid_split(v->value, cid_name, sizeof(cid_name), cid_num, sizeof(cid_num));
04065          }
04066       } else if (!strcasecmp(v->name, "language")) {
04067          ast_copy_string(language, v->value, sizeof(language));
04068       } else if (!strcasecmp(v->name, "accountcode")) {
04069          ast_copy_string(accountcode, v->value, sizeof(accountcode));
04070       } else if (!strcasecmp(v->name, "amaflags")) {
04071          y = ast_cdr_amaflags2int(v->value);
04072          if (y < 0) {
04073             ast_log(LOG_WARNING, "Invalid AMA flags: %s at line %d\n", v->value, v->lineno);
04074          } else {
04075             amaflags = y;
04076          }
04077       } else if (!strcasecmp(v->name, "setvar")) {
04078          chanvars = add_var(v->value, chanvars);
04079       } else if (!strcasecmp(v->name, "clearvars")) {
04080          if (chanvars) {
04081             ast_variables_destroy(chanvars);
04082             chanvars = NULL;
04083          }
04084       } else if (!strcasecmp(v->name, "musiconhold")) {
04085          ast_copy_string(musicclass, v->value, sizeof(musicclass));
04086       } else if (!strcasecmp(v->name, "parkinglot")) {
04087          ast_copy_string(parkinglot, v->value, sizeof(parkinglot));
04088       } else if (!strcasecmp(v->name, "callgroup")) {
04089          cur_callergroup = ast_get_group(v->value);
04090       } else if (!strcasecmp(v->name, "pickupgroup")) {
04091          cur_pickupgroup = ast_get_group(v->value);
04092       } else if (!strcasecmp(v->name, "immediate")) {
04093          immediate = ast_true(v->value);
04094       } else if (!strcasecmp(v->name, "cancallforward")) {
04095          cancallforward = ast_true(v->value);
04096       } else if (!strcasecmp(v->name, "singlepath")) {
04097          singlepath = ast_true(v->value);
04098       } else if (!strcasecmp(v->name, "directmedia") || !strcasecmp(v->name, "canreinvite")) {
04099          directmedia = ast_true(v->value);
04100       } else if (!strcasecmp(v->name, "mailbox")) {
04101          ast_copy_string(mailbox, v->value, sizeof(mailbox));
04102       } else if (!strcasecmp(v->name, "hasvoicemail")) {
04103          if (ast_true(v->value) && ast_strlen_zero(mailbox)) {
04104             ast_copy_string(mailbox, gw->name, sizeof(mailbox));
04105          }
04106       } else if (!strcasecmp(v->name, "adsi")) {
04107          adsi = ast_true(v->value);
04108       } else if (!strcasecmp(v->name, "callreturn")) {
04109          callreturn = ast_true(v->value);
04110       } else if (!strcasecmp(v->name, "callwaiting")) {
04111          callwaiting = ast_true(v->value);
04112       } else if (!strcasecmp(v->name, "slowsequence")) {
04113          slowsequence = ast_true(v->value);
04114       } else if (!strcasecmp(v->name, "transfer")) {
04115          transfer = ast_true(v->value);
04116       } else if (!strcasecmp(v->name, "threewaycalling")) {
04117          threewaycalling = ast_true(v->value);
04118       } else if (!strcasecmp(v->name, "wcardep")) {
04119          /* locate existing endpoint */
04120          for (e = gw->endpoints; e; e = e->next) {
04121             if (!strcasecmp(v->value, e->name)) {
04122                /* endpoint already exists */
04123                e->delme = 0;
04124                ep_reload = 1;
04125                break;
04126             }
04127          }
04128 
04129          if (!e) {
04130             /* Allocate wildcard endpoint */
04131             e = ast_calloc(1, sizeof(*e));
04132             ep_reload = 0;
04133          }
04134 
04135          if (e) {
04136             if (!ep_reload) {
04137                memset(e, 0, sizeof(struct mgcp_endpoint));
04138                ast_mutex_init(&e->lock);
04139                ast_mutex_init(&e->rqnt_queue_lock);
04140                ast_mutex_init(&e->cmd_queue_lock);
04141                ast_copy_string(e->name, v->value, sizeof(e->name));
04142                e->needaudit = 1;
04143             }
04144             ast_copy_string(gw->wcardep, v->value, sizeof(gw->wcardep));
04145             /* XXX Should we really check for uniqueness?? XXX */
04146             ast_copy_string(e->accountcode, accountcode, sizeof(e->accountcode));
04147             ast_copy_string(e->context, context, sizeof(e->context));
04148             ast_copy_string(e->cid_num, cid_num, sizeof(e->cid_num));
04149             ast_copy_string(e->cid_name, cid_name, sizeof(e->cid_name));
04150             ast_copy_string(e->language, language, sizeof(e->language));
04151             ast_copy_string(e->musicclass, musicclass, sizeof(e->musicclass));
04152             ast_copy_string(e->mailbox, mailbox, sizeof(e->mailbox));
04153             ast_copy_string(e->parkinglot, parkinglot, sizeof(e->parkinglot));
04154             if (!ast_strlen_zero(e->mailbox)) {
04155                char *mbox, *cntx;
04156                cntx = mbox = ast_strdupa(e->mailbox);
04157                strsep(&cntx, "@");
04158                if (ast_strlen_zero(cntx)) {
04159                   cntx = "default";
04160                }
04161                e->mwi_event_sub = ast_event_subscribe(AST_EVENT_MWI, mwi_event_cb, "MGCP MWI subscription", NULL,
04162                   AST_EVENT_IE_MAILBOX, AST_EVENT_IE_PLTYPE_STR, mbox,
04163                   AST_EVENT_IE_CONTEXT, AST_EVENT_IE_PLTYPE_STR, cntx,
04164                   AST_EVENT_IE_NEWMSGS, AST_EVENT_IE_PLTYPE_EXISTS,
04165                   AST_EVENT_IE_END);
04166             }
04167             snprintf(e->rqnt_ident, sizeof(e->rqnt_ident), "%08lx", ast_random());
04168             e->msgstate = -1;
04169             e->amaflags = amaflags;
04170             e->capability = capability;
04171             e->parent = gw;
04172             e->ncs = ncs;
04173             e->dtmfmode = dtmfmode;
04174             if (!ep_reload && e->sub && e->sub->rtp) {
04175                e->dtmfmode |= MGCP_DTMF_INBAND;
04176             }
04177             e->adsi = adsi;
04178             e->type = TYPE_LINE;
04179             e->immediate = immediate;
04180             e->callgroup=cur_callergroup;
04181             e->pickupgroup=cur_pickupgroup;
04182             e->callreturn = callreturn;
04183             e->cancallforward = cancallforward;
04184             e->singlepath = singlepath;
04185             e->directmedia = directmedia;
04186             e->callwaiting = callwaiting;
04187             e->hascallwaiting = callwaiting;
04188             e->slowsequence = slowsequence;
04189             e->transfer = transfer;
04190             e->threewaycalling = threewaycalling;
04191             e->onhooktime = time(NULL);
04192             /* ASSUME we're onhook */
04193             e->hookstate = MGCP_ONHOOK;
04194             e->chanvars = copy_vars(chanvars);
04195             if (!ep_reload) {
04196                /*snprintf(txident, sizeof(txident), "%08lx", ast_random());*/
04197                for (i = 0; i < MAX_SUBS; i++) {
04198                   sub = ast_calloc(1, sizeof(*sub));
04199                   if (sub) {
04200                      ast_verb(3, "Allocating subchannel '%d' on %s@%s\n", i, e->name, gw->name);
04201                      ast_mutex_init(&sub->lock);
04202                      ast_mutex_init(&sub->cx_queue_lock);
04203                      sub->parent = e;
04204                      sub->id = i;
04205                      snprintf(sub->txident, sizeof(sub->txident), "%08lx", ast_random());
04206                      /*stnrcpy(sub->txident, txident, sizeof(sub->txident) - 1);*/
04207                      sub->cxmode = MGCP_CX_INACTIVE;
04208                      sub->nat = nat;
04209                      sub->gate = NULL;
04210                      sub->sdpsent = 0;
04211                      sub->next = e->sub;
04212                      e->sub = sub;
04213                   } else {
04214                      /* XXX Should find a way to clean up our memory */
04215                      ast_log(LOG_WARNING, "Out of memory allocating subchannel\n");
04216                      return NULL;
04217                   }
04218                }
04219                /* Make out subs a circular linked list so we can always sping through the whole bunch */
04220                /* find the end of the list */
04221                for (sub = e->sub; sub && sub->next; sub = sub->next);
04222                /* set the last sub->next to the first sub */
04223                sub->next = e->sub;
04224 
04225                e->next = gw->endpoints;
04226                gw->endpoints = e;
04227             }
04228          }
04229       } else if (!strcasecmp(v->name, "trunk") ||
04230                  !strcasecmp(v->name, "line")) {
04231 
04232          /* locate existing endpoint */
04233          for (e = gw->endpoints; e; e = e->next) {
04234             if (!strcasecmp(v->value, e->name)) {
04235                /* endpoint already exists */
04236                e->delme = 0;
04237                ep_reload = 1;
04238                break;
04239             }
04240          }
04241 
04242          if (!e) {
04243             e = ast_calloc(1, sizeof(*e));
04244             ep_reload = 0;
04245          }
04246 
04247          if (e) {
04248             if (!ep_reload) {
04249                ast_mutex_init(&e->lock);
04250                ast_mutex_init(&e->rqnt_queue_lock);
04251                ast_mutex_init(&e->cmd_queue_lock);
04252                ast_copy_string(e->name, v->value, sizeof(e->name));
04253                e->needaudit = 1;
04254             }
04255             /* XXX Should we really check for uniqueness?? XXX */
04256             ast_copy_string(e->accountcode, accountcode, sizeof(e->accountcode));
04257             ast_copy_string(e->context, context, sizeof(e->context));
04258             ast_copy_string(e->cid_num, cid_num, sizeof(e->cid_num));
04259             ast_copy_string(e->cid_name, cid_name, sizeof(e->cid_name));
04260             ast_copy_string(e->language, language, sizeof(e->language));
04261             ast_copy_string(e->musicclass, musicclass, sizeof(e->musicclass));
04262             ast_copy_string(e->mailbox, mailbox, sizeof(e->mailbox));
04263             ast_copy_string(e->parkinglot, parkinglot, sizeof(e->parkinglot));
04264             if (!ast_strlen_zero(mailbox)) {
04265                ast_verb(3, "Setting mailbox '%s' on %s@%s\n", mailbox, gw->name, e->name);
04266             }
04267             if (!ep_reload) {
04268                /* XXX potential issue due to reload */
04269                e->msgstate = -1;
04270                e->parent = gw;
04271             }
04272             e->amaflags = amaflags;
04273             e->capability = capability;
04274             e->dtmfmode = dtmfmode;
04275             e->ncs = ncs;
04276             e->pktcgatealloc = pktcgatealloc;
04277             e->hangupongateremove = hangupongateremove;
04278             e->adsi = adsi;
04279             e->type = (!strcasecmp(v->name, "trunk")) ? TYPE_TRUNK : TYPE_LINE;
04280             e->immediate = immediate;
04281             e->callgroup=cur_callergroup;
04282             e->pickupgroup=cur_pickupgroup;
04283             e->callreturn = callreturn;
04284             e->cancallforward = cancallforward;
04285             e->directmedia = directmedia;
04286             e->singlepath = singlepath;
04287             e->callwaiting = callwaiting;
04288             e->hascallwaiting = callwaiting;
04289             e->slowsequence = slowsequence;
04290             e->transfer = transfer;
04291             e->threewaycalling = threewaycalling;
04292 
04293             /* If we already have a valid chanvars, it's not a new endpoint (it's a reload),
04294                so first, free previous mem
04295              */
04296             if (e->chanvars) {
04297                ast_variables_destroy(e->chanvars);
04298                e->chanvars = NULL;
04299             }
04300             e->chanvars = copy_vars(chanvars);
04301 
04302             if (!ep_reload) {
04303                e->onhooktime = time(NULL);
04304                /* ASSUME we're onhook */
04305                e->hookstate = MGCP_ONHOOK;
04306                snprintf(e->rqnt_ident, sizeof(e->rqnt_ident), "%08lx", ast_random());
04307             }
04308 
04309             for (i = 0, sub = NULL; i < MAX_SUBS; i++) {
04310                if (!ep_reload) {
04311                   sub = ast_calloc(1, sizeof(*sub));
04312                } else {
04313                   if (!sub) {
04314                      sub = e->sub;
04315                   } else {
04316                      sub = sub->next;
04317                   }
04318                }
04319 
04320                if (sub) {
04321                   if (!ep_reload) {
04322                      ast_verb(3, "Allocating subchannel '%d' on %s@%s\n", i, e->name, gw->name);
04323                      ast_mutex_init(&sub->lock);
04324                      ast_mutex_init(&sub->cx_queue_lock);
04325                      ast_copy_string(sub->magic, MGCP_SUBCHANNEL_MAGIC, sizeof(sub->magic));
04326                      sub->parent = e;
04327                      sub->id = i;
04328                      snprintf(sub->txident, sizeof(sub->txident), "%08lx", ast_random());
04329                      sub->cxmode = MGCP_CX_INACTIVE;
04330                      sub->next = e->sub;
04331                      e->sub = sub;
04332                   }
04333                   sub->nat = nat;
04334                } else {
04335                   /* XXX Should find a way to clean up our memory */
04336                   ast_log(LOG_WARNING, "Out of memory allocating subchannel\n");
04337                   return NULL;
04338                }
04339             }
04340             if (!ep_reload) {
04341                /* Make out subs a circular linked list so we can always sping through the whole bunch */
04342                /* find the end of the list */
04343                for (sub = e->sub; sub && sub->next; sub = sub->next);
04344                /* set the last sub->next to the first sub */
04345                sub->next = e->sub;
04346 
04347                e->next = gw->endpoints;
04348                gw->endpoints = e;
04349             }
04350          }
04351       } else if (!strcasecmp(v->name, "name") || !strcasecmp(v->name, "lines")) {
04352          /* just eliminate realtime warnings */
04353       } else {
04354          ast_log(LOG_WARNING, "Don't know keyword '%s' at line %d\n", v->name, v->lineno);
04355       }
04356    }
04357    if (!ntohl(gw->addr.sin_addr.s_addr) && !gw->dynamic) {
04358       ast_log(LOG_WARNING, "Gateway '%s' lacks IP address and isn't dynamic\n", gw->name);
04359       if (!gw_reload) {
04360          ast_mutex_destroy(&gw->msgs_lock);
04361          ast_free(gw);
04362       }
04363 
04364       /* Return NULL */
04365       gw_reload = 1;
04366    } else {
04367       gw->defaddr.sin_family = AF_INET;
04368       gw->addr.sin_family = AF_INET;
04369       if (gw->defaddr.sin_addr.s_addr && !ntohs(gw->defaddr.sin_port)) {
04370          gw->defaddr.sin_port = htons(DEFAULT_MGCP_GW_PORT);
04371       }
04372       if (gw->addr.sin_addr.s_addr && !ntohs(gw->addr.sin_port)) {
04373          gw->addr.sin_port = htons(DEFAULT_MGCP_GW_PORT);
04374       }
04375       {
04376          struct ast_sockaddr tmp1, tmp2;
04377          struct sockaddr_in tmp3 = {0,};
04378 
04379          tmp3.sin_addr = gw->ourip;
04380          ast_sockaddr_from_sin(&tmp1, &gw->addr);
04381          ast_sockaddr_from_sin(&tmp2, &tmp3);
04382          if (gw->addr.sin_addr.s_addr && ast_ouraddrfor(&tmp1, &tmp2)) {
04383             memcpy(&gw->ourip, &__ourip, sizeof(gw->ourip));
04384          } else {
04385             ast_sockaddr_to_sin(&tmp2, &tmp3);
04386             gw->ourip = tmp3.sin_addr;
04387          }
04388       }
04389    }
04390 
04391    if (chanvars) {
04392       ast_variables_destroy(chanvars);
04393       chanvars = NULL;
04394    }
04395    return (gw_reload ? NULL : gw);
04396 }
04397 
04398 static enum ast_rtp_glue_result mgcp_get_rtp_peer(struct ast_channel *chan, struct ast_rtp_instance **instance)
04399 {
04400    struct mgcp_subchannel *sub = NULL;
04401 
04402    if (!(sub = chan->tech_pvt) || !(sub->rtp))
04403       return AST_RTP_GLUE_RESULT_FORBID;
04404 
04405    *instance = sub->rtp ? ao2_ref(sub->rtp, +1), sub->rtp : NULL;
04406 
04407    if (sub->parent->directmedia)
04408       return AST_RTP_GLUE_RESULT_REMOTE;
04409    else
04410       return AST_RTP_GLUE_RESULT_LOCAL;
04411 }
04412 
04413 static int mgcp_set_rtp_peer(struct ast_channel *chan, struct ast_rtp_instance *rtp, struct ast_rtp_instance *vrtp, struct ast_rtp_instance *trtp, format_t codecs, int nat_active)
04414 {
04415    /* XXX Is there such thing as video support with MGCP? XXX */
04416    struct mgcp_subchannel *sub;
04417    sub = chan->tech_pvt;
04418    if (sub && !sub->alreadygone) {
04419       transmit_modify_with_sdp(sub, rtp, codecs);
04420       return 0;
04421    }
04422    return -1;
04423 }
04424 
04425 static format_t mgcp_get_codec(struct ast_channel *chan)
04426 {
04427    struct mgcp_subchannel *sub = chan->tech_pvt;
04428    struct mgcp_endpoint *p = sub->parent;
04429    return p->capability;
04430 }
04431 
04432 static struct ast_rtp_glue mgcp_rtp_glue = {
04433    .type = "MGCP",
04434    .get_rtp_info = mgcp_get_rtp_peer,
04435    .update_peer = mgcp_set_rtp_peer,
04436    .get_codec = mgcp_get_codec,
04437 };
04438 
04439 
04440 static int acf_channel_read(struct ast_channel *chan, const char *funcname, char *args, char *buf, size_t buflen)
04441 {
04442    struct mgcp_subchannel *sub = chan->tech_pvt;
04443    int res = 0;
04444 
04445    /* Sanity check */
04446    if (!chan || chan->tech != &mgcp_tech) {
04447       ast_log(LOG_ERROR, "This function requires a valid MGCP channel\n");
04448       return -1;
04449    }
04450 
04451    if (!strcasecmp(args, "ncs")) {
04452       snprintf(buf, buflen, "%s", sub->parent->ncs ?  "yes":"no");
04453    } else {
04454       res = -1;
04455    }
04456    return res;
04457 }
04458 
04459 
04460 static void destroy_endpoint(struct mgcp_endpoint *e)
04461 {
04462    struct mgcp_subchannel *sub = e->sub->next, *s;
04463    int i;
04464 
04465    for (i = 0; i < MAX_SUBS; i++) {
04466       ast_mutex_lock(&sub->lock);
04467       if (!ast_strlen_zero(sub->cxident)) {
04468          transmit_connection_del(sub);
04469       }
04470       if (sub->rtp) {
04471          ast_rtp_instance_destroy(sub->rtp);
04472          sub->rtp = NULL;
04473       }
04474       memset(sub->magic, 0, sizeof(sub->magic));
04475       mgcp_queue_hangup(sub);
04476       dump_cmd_queues(NULL, sub);
04477       if(sub->gate) {
04478          sub->gate->tech_pvt = NULL;
04479          sub->gate->got_dq_gi = NULL;
04480          sub->gate->gate_remove = NULL;
04481          sub->gate->gate_open = NULL;
04482       }
04483       ast_mutex_unlock(&sub->lock);
04484       sub = sub->next;
04485    }
04486 
04487    if (e->dsp) {
04488       ast_dsp_free(e->dsp);
04489    }
04490 
04491    dump_queue(e->parent, e);
04492    dump_cmd_queues(e, NULL);
04493 
04494    sub = e->sub;
04495    for (i = 0; (i < MAX_SUBS) && sub; i++) {
04496       s = sub;
04497       sub = sub->next;
04498       ast_mutex_destroy(&s->lock);
04499       ast_mutex_destroy(&s->cx_queue_lock);
04500       ast_free(s);
04501    }
04502 
04503    if (e->mwi_event_sub)
04504       ast_event_unsubscribe(e->mwi_event_sub);
04505 
04506    if (e->chanvars) {
04507       ast_variables_destroy(e->chanvars);
04508       e->chanvars = NULL;
04509    }
04510 
04511    ast_mutex_destroy(&e->lock);
04512    ast_mutex_destroy(&e->rqnt_queue_lock);
04513    ast_mutex_destroy(&e->cmd_queue_lock);
04514    ast_free(e);
04515 }
04516 
04517 static void destroy_gateway(struct mgcp_gateway *g)
04518 {
04519    if (g->ha)
04520       ast_free_ha(g->ha);
04521 
04522    dump_queue(g, NULL);
04523 
04524    ast_free(g);
04525 }
04526 
04527 static void prune_gateways(void)
04528 {
04529    struct mgcp_gateway *g, *z, *r;
04530    struct mgcp_endpoint *e, *p, *t;
04531 
04532    ast_mutex_lock(&gatelock);
04533 
04534    /* prune gateways */
04535    for (z = NULL, g = gateways; g;) {
04536       /* prune endpoints */
04537       for (p = NULL, e = g->endpoints; e; ) {
04538          if (!g->realtime && (e->delme || g->delme)) {
04539             t = e;
04540             e = e->next;
04541             if (!p)
04542                g->endpoints = e;
04543             else
04544                p->next = e;
04545             destroy_endpoint(t);
04546          } else {
04547             p = e;
04548             e = e->next;
04549          }
04550       }
04551 
04552       if (g->delme) {
04553          r = g;
04554          g = g->next;
04555          if (!z)
04556             gateways = g;
04557          else
04558             z->next = g;
04559 
04560          destroy_gateway(r);
04561       } else {
04562          z = g;
04563          g = g->next;
04564       }
04565    }
04566 
04567    ast_mutex_unlock(&gatelock);
04568 }
04569 
04570 static struct ast_variable *add_var(const char *buf, struct ast_variable *list)
04571 {
04572    struct ast_variable *tmpvar = NULL;
04573    char *varname = ast_strdupa(buf), *varval = NULL;
04574 
04575    if ((varval = strchr(varname, '='))) {
04576       *varval++ = '\0';
04577       if ((tmpvar = ast_variable_new(varname, varval, ""))) {
04578          tmpvar->next = list;
04579          list = tmpvar;
04580       }
04581    }
04582    return list;
04583 }
04584 
04585 /*! \brief
04586  * duplicate a list of channel variables, \return the copy.
04587  */
04588 static struct ast_variable *copy_vars(struct ast_variable *src)
04589 {
04590    struct ast_variable *res = NULL, *tmp, *v = NULL;
04591 
04592    for (v = src ; v ; v = v->next) {
04593       if ((tmp = ast_variable_new(v->name, v->value, v->file))) {
04594          tmp->next = res;
04595          res = tmp;
04596       }
04597    }
04598    return res;
04599 }
04600 
04601 
04602 static int reload_config(int reload)
04603 {
04604    struct ast_config *cfg;
04605    struct ast_variable *v;
04606    struct mgcp_gateway *g;
04607    struct mgcp_endpoint *e;
04608    char *cat;
04609    struct ast_hostent ahp;
04610    struct hostent *hp;
04611    int format;
04612    struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
04613    
04614    if (gethostname(ourhost, sizeof(ourhost)-1)) {
04615       ast_log(LOG_WARNING, "Unable to get hostname, MGCP disabled\n");
04616       return 0;
04617    }
04618    cfg = ast_config_load(config, config_flags);
04619 
04620    /* We *must* have a config file otherwise stop immediately */
04621    if (!cfg) {
04622       ast_log(LOG_NOTICE, "Unable to load config %s, MGCP disabled\n", config);
04623       return 0;
04624    } else if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
04625       return 0;
04626    } else if (cfg == CONFIG_STATUS_FILEINVALID) {
04627       ast_log(LOG_ERROR, "Config file %s is in an invalid format.  Aborting.\n", config);
04628       return 0;
04629    }
04630 
04631    memset(&bindaddr, 0, sizeof(bindaddr));
04632    dtmfmode = 0;
04633 
04634    /* Copy the default jb config over global_jbconf */
04635    memcpy(&global_jbconf, &default_jbconf, sizeof(struct ast_jb_conf));
04636 
04637    for (v = ast_variable_browse(cfg, "general"); v; v = v->next) {
04638       /* handle jb conf */
04639       if (!ast_jb_read_conf(&global_jbconf, v->name, v->value)) {
04640          continue;
04641       }
04642 
04643       /* Create the interface list */
04644       if (!strcasecmp(v->name, "bindaddr")) {
04645          if (!(hp = ast_gethostbyname(v->value, &ahp))) {
04646             ast_log(LOG_WARNING, "Invalid address: %s\n", v->value);
04647          } else {
04648             memcpy(&bindaddr.sin_addr, hp->h_addr, sizeof(bindaddr.sin_addr));
04649          }
04650       } else if (!strcasecmp(v->name, "allow")) {
04651          format = ast_getformatbyname(v->value);
04652          if (format < 1) {
04653             ast_log(LOG_WARNING, "Cannot allow unknown format '%s'\n", v->value);
04654          } else {
04655             capability |= format;
04656          }
04657       } else if (!strcasecmp(v->name, "disallow")) {
04658          format = ast_getformatbyname(v->value);
04659          if (format < 1) {
04660             ast_log(LOG_WARNING, "Cannot disallow unknown format '%s'\n", v->value);
04661          } else {
04662             capability &= ~format;
04663          }
04664       } else if (!strcasecmp(v->name, "tos")) {
04665          if (ast_str2tos(v->value, &qos.tos)) {
04666              ast_log(LOG_WARNING, "Invalid tos value at line %d, refer to QoS documentation\n", v->lineno);
04667          }
04668       } else if (!strcasecmp(v->name, "tos_audio")) {
04669          if (ast_str2tos(v->value, &qos.tos_audio))
04670              ast_log(LOG_WARNING, "Invalid tos_audio value at line %d, refer to QoS documentation\n", v->lineno);
04671       } else if (!strcasecmp(v->name, "cos")) {
04672          if (ast_str2cos(v->value, &qos.cos))
04673              ast_log(LOG_WARNING, "Invalid cos value at line %d, refer to QoS documentation\n", v->lineno);
04674       } else if (!strcasecmp(v->name, "cos_audio")) {
04675          if (ast_str2cos(v->value, &qos.cos_audio))
04676              ast_log(LOG_WARNING, "Invalid cos_audio value at line %d, refer to QoS documentation\n", v->lineno);
04677       } else if (!strcasecmp(v->name, "port")) {
04678          if (sscanf(v->value, "%5d", &ourport) == 1) {
04679             bindaddr.sin_port = htons(ourport);
04680          } else {
04681             ast_log(LOG_WARNING, "Invalid port number '%s' at line %d of %s\n", v->value, v->lineno, config);
04682          }
04683       } else if (!strcasecmp(v->name, "firstdigittimeout")) {
04684          firstdigittimeout = atoi(v->value);
04685       } else if (!strcasecmp(v->name, "gendigittimeout")) {
04686          gendigittimeout = atoi(v->value);
04687       } else if (!strcasecmp(v->name, "matchdigittimeout")) {
04688          matchdigittimeout = atoi(v->value);
04689       }
04690    }
04691 
04692    /* mark existing entries for deletion */
04693    ast_mutex_lock(&gatelock);
04694    for (g = gateways; g; g = g->next) {
04695       g->delme = 1;
04696       for (e = g->endpoints; e; e = e->next) {
04697          e->delme = 1;
04698       }
04699    }
04700    ast_mutex_unlock(&gatelock);
04701 
04702    for (cat = ast_category_browse(cfg, NULL); cat; cat = ast_category_browse(cfg, cat)) {
04703       if (strcasecmp(cat, "general")) {
04704          ast_mutex_lock(&gatelock);
04705          if ((g = build_gateway(cat, ast_variable_browse(cfg, cat)))) {
04706             ast_verb(3, "Added gateway '%s'\n", g->name);
04707             g->next = gateways;
04708             gateways = g;
04709          }
04710          ast_mutex_unlock(&gatelock);
04711 
04712          /* FS: process queue and IO */
04713          if (monitor_thread == pthread_self()) {
04714             if (sched) ast_sched_runq(sched);
04715             if (io) ast_io_wait(io, 10);
04716          }
04717       }
04718    }
04719 
04720    /* prune deleted entries etc. */
04721    prune_gateways();
04722 
04723    if (ntohl(bindaddr.sin_addr.s_addr)) {
04724       memcpy(&__ourip, &bindaddr.sin_addr, sizeof(__ourip));
04725    } else {
04726       hp = ast_gethostbyname(ourhost, &ahp);
04727       if (!hp) {
04728          ast_log(LOG_WARNING, "Unable to get our IP address, MGCP disabled\n");
04729          ast_config_destroy(cfg);
04730          return 0;
04731       }
04732       memcpy(&__ourip, hp->h_addr, sizeof(__ourip));
04733    }
04734    if (!ntohs(bindaddr.sin_port))
04735       bindaddr.sin_port = ntohs(DEFAULT_MGCP_CA_PORT);
04736    bindaddr.sin_family = AF_INET;
04737    ast_mutex_lock(&netlock);
04738    if (mgcpsock > -1)
04739       close(mgcpsock);
04740 
04741    if (mgcpsock_read_id != NULL)
04742       ast_io_remove(io, mgcpsock_read_id);
04743    mgcpsock_read_id = NULL;
04744 
04745    mgcpsock = socket(AF_INET, SOCK_DGRAM, 0);
04746    if (mgcpsock < 0) {
04747       ast_log(LOG_WARNING, "Unable to create MGCP socket: %s\n", strerror(errno));
04748    } else {
04749       if (bind(mgcpsock, (struct sockaddr *)&bindaddr, sizeof(bindaddr)) < 0) {
04750          ast_log(LOG_WARNING, "Failed to bind to %s:%d: %s\n",
04751             ast_inet_ntoa(bindaddr.sin_addr), ntohs(bindaddr.sin_port),
04752                strerror(errno));
04753          close(mgcpsock);
04754          mgcpsock = -1;
04755       } else {
04756          ast_verb(2, "MGCP Listening on %s:%d\n",
04757                ast_inet_ntoa(bindaddr.sin_addr), ntohs(bindaddr.sin_port));
04758          ast_netsock_set_qos(mgcpsock, qos.tos, qos.cos, "MGCP");
04759       }
04760    }
04761    ast_mutex_unlock(&netlock);
04762    ast_config_destroy(cfg);
04763 
04764    /* send audit only to the new endpoints */
04765    for (g = gateways; g; g = g->next) {
04766       for (e = g->endpoints; e && e->needaudit; e = e->next) {
04767          e->needaudit = 0;
04768          transmit_audit_endpoint(e);
04769          ast_verb(3, "MGCP Auditing endpoint %s@%s for hookstate\n", e->name, g->name);
04770       }
04771    }
04772 
04773    return 0;
04774 }
04775 
04776 /*! \brief  load_module: PBX load module - initialization ---*/
04777 static int load_module(void)
04778 {
04779    if (!(sched = sched_context_create())) {
04780       ast_log(LOG_WARNING, "Unable to create schedule context\n");
04781       return AST_MODULE_LOAD_FAILURE;
04782    }
04783 
04784    if (!(io = io_context_create())) {
04785       ast_log(LOG_WARNING, "Unable to create I/O context\n");
04786       sched_context_destroy(sched);
04787       return AST_MODULE_LOAD_FAILURE;
04788    }
04789 
04790    if (reload_config(0))
04791       return AST_MODULE_LOAD_DECLINE;
04792 
04793    /* Make sure we can register our mgcp channel type */
04794    if (ast_channel_register(&mgcp_tech)) {
04795       ast_log(LOG_ERROR, "Unable to register channel class 'MGCP'\n");
04796       io_context_destroy(io);
04797       sched_context_destroy(sched);
04798       return AST_MODULE_LOAD_FAILURE;
04799    }
04800 
04801    ast_rtp_glue_register(&mgcp_rtp_glue);
04802    ast_cli_register_multiple(cli_mgcp, sizeof(cli_mgcp) / sizeof(struct ast_cli_entry));
04803 
04804    /* And start the monitor for the first time */
04805    restart_monitor();
04806 
04807    return AST_MODULE_LOAD_SUCCESS;
04808 }
04809 
04810 static char *mgcp_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
04811 {
04812    static int deprecated = 0;
04813 
04814    if (e) {
04815       switch (cmd) {
04816       case CLI_INIT:
04817          e->command = "mgcp reload";
04818          e->usage =
04819             "Usage: mgcp reload\n"
04820             "       'mgcp reload' is deprecated.  Please use 'reload chan_mgcp.so' instead.\n";
04821          return NULL;
04822       case CLI_GENERATE:
04823          return NULL;
04824       }
04825    }
04826 
04827    if (!deprecated && a && a->argc > 0) {
04828       ast_log(LOG_WARNING, "'mgcp reload' is deprecated.  Please use 'reload chan_mgcp.so' instead.\n");
04829       deprecated = 1;
04830    }
04831 
04832    ast_mutex_lock(&mgcp_reload_lock);
04833    if (mgcp_reloading) {
04834       ast_verbose("Previous mgcp reload not yet done\n");
04835    } else {
04836       mgcp_reloading = 1;
04837    }
04838    ast_mutex_unlock(&mgcp_reload_lock);
04839    restart_monitor();
04840    return CLI_SUCCESS;
04841 }
04842 
04843 static int reload(void)
04844 {
04845    mgcp_reload(NULL, 0, NULL);
04846    return 0;
04847 }
04848 
04849 static int unload_module(void)
04850 {
04851    struct mgcp_endpoint *e;
04852    struct mgcp_gateway *g;
04853 
04854    /* Check to see if we're reloading */
04855    if (ast_mutex_trylock(&mgcp_reload_lock)) {
04856       ast_log(LOG_WARNING, "MGCP is currently reloading.  Unable to remove module.\n");
04857       return -1;
04858    } else {
04859       mgcp_reloading = 1;
04860       ast_mutex_unlock(&mgcp_reload_lock);
04861    }
04862 
04863    /* First, take us out of the channel loop */
04864    ast_channel_unregister(&mgcp_tech);
04865 
04866    /* Shut down the monitoring thread */
04867    if (!ast_mutex_lock(&monlock)) {
04868       if (monitor_thread && (monitor_thread != AST_PTHREADT_STOP)) {
04869          pthread_cancel(monitor_thread);
04870          pthread_kill(monitor_thread, SIGURG);
04871          pthread_join(monitor_thread, NULL);
04872       }
04873       monitor_thread = AST_PTHREADT_STOP;
04874       ast_mutex_unlock(&monlock);
04875    } else {
04876       ast_log(LOG_WARNING, "Unable to lock the monitor\n");
04877       /* We always want to leave this in a consistent state */
04878       ast_channel_register(&mgcp_tech);
04879       mgcp_reloading = 0;
04880       mgcp_reload(NULL, 0, NULL);
04881       return -1;
04882    }
04883 
04884    if (!ast_mutex_lock(&gatelock)) {
04885       for (g = gateways; g; g = g->next) {
04886          g->delme = 1;
04887          for (e = g->endpoints; e; e = e->next) {
04888             e->delme = 1;
04889          }
04890       }
04891 
04892       prune_gateways();
04893       ast_mutex_unlock(&gatelock);
04894    } else {
04895       ast_log(LOG_WARNING, "Unable to lock the gateways list.\n");
04896       /* We always want to leave this in a consistent state */
04897       ast_channel_register(&mgcp_tech);
04898       /* Allow the monitor to restart */
04899       monitor_thread = AST_PTHREADT_NULL;
04900       mgcp_reloading = 0;
04901       mgcp_reload(NULL, 0, NULL);
04902       return -1;
04903    }
04904 
04905    close(mgcpsock);
04906    ast_rtp_glue_unregister(&mgcp_rtp_glue);
04907    ast_cli_unregister_multiple(cli_mgcp, sizeof(cli_mgcp) / sizeof(struct ast_cli_entry));
04908    sched_context_destroy(sched);
04909 
04910    return 0;
04911 }
04912 
04913 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Media Gateway Control Protocol (MGCP)",
04914       .load = load_module,
04915       .unload = unload_module,
04916       .reload = reload,
04917       .load_pri = AST_MODPRI_CHANNEL_DRIVER,
04918       .nonoptreq = "res_pktccops",
04919           );

Generated on Wed Apr 6 11:29:42 2011 for Asterisk - The Open Source Telephony Project by  doxygen 1.4.7