Thu May 14 14:48:56 2009

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  *
00028  * \ingroup channel_drivers
00029  */
00030 /*** MODULEINFO
00031         <depend>res_features</depend>
00032  ***/
00033 
00034 #include "asterisk.h"
00035 
00036 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 123113 $")
00037 
00038 #include <stdio.h>
00039 #include <string.h>
00040 #include <unistd.h>
00041 #include <sys/socket.h>
00042 #include <sys/ioctl.h>
00043 #include <net/if.h>
00044 #include <errno.h>
00045 #include <stdlib.h>
00046 #include <fcntl.h>
00047 #include <netdb.h>
00048 #include <sys/signal.h>
00049 #include <signal.h>
00050 #include <netinet/in.h>
00051 #include <netinet/in_systm.h>
00052 #include <netinet/ip.h>
00053 #include <arpa/inet.h>
00054 #include <ctype.h>
00055 
00056 #include "asterisk/lock.h"
00057 #include "asterisk/channel.h"
00058 #include "asterisk/config.h"
00059 #include "asterisk/logger.h"
00060 #include "asterisk/module.h"
00061 #include "asterisk/pbx.h"
00062 #include "asterisk/options.h"
00063 #include "asterisk/lock.h"
00064 #include "asterisk/sched.h"
00065 #include "asterisk/io.h"
00066 #include "asterisk/rtp.h"
00067 #include "asterisk/acl.h"
00068 #include "asterisk/callerid.h"
00069 #include "asterisk/cli.h"
00070 #include "asterisk/say.h"
00071 #include "asterisk/cdr.h"
00072 #include "asterisk/astdb.h"
00073 #include "asterisk/features.h"
00074 #include "asterisk/app.h"
00075 #include "asterisk/musiconhold.h"
00076 #include "asterisk/utils.h"
00077 #include "asterisk/causes.h"
00078 #include "asterisk/dsp.h"
00079 #include "asterisk/devicestate.h"
00080 #include "asterisk/stringfields.h"
00081 #include "asterisk/abstract_jb.h"
00082 
00083 #ifndef IPTOS_MINCOST
00084 #define IPTOS_MINCOST 0x02
00085 #endif
00086 
00087 /*
00088  * Define to work around buggy dlink MGCP phone firmware which
00089  * appears not to know that "rt" is part of the "G" package.
00090  */
00091 /* #define DLINK_BUGGY_FIRMWARE  */
00092 
00093 #define MGCPDUMPER
00094 #define DEFAULT_EXPIRY  120
00095 #define MAX_EXPIRY   3600
00096 #define CANREINVITE  1
00097 
00098 #ifndef INADDR_NONE
00099 #define INADDR_NONE (in_addr_t)(-1)
00100 #endif
00101 
00102 /*! Global jitterbuffer configuration - by default, jb is disabled */
00103 static struct ast_jb_conf default_jbconf =
00104 {
00105    .flags = 0,
00106    .max_size = -1,
00107    .resync_threshold = -1,
00108    .impl = ""
00109 };
00110 static struct ast_jb_conf global_jbconf;
00111 
00112 static const char tdesc[] = "Media Gateway Control Protocol (MGCP)";
00113 static const char config[] = "mgcp.conf";
00114 
00115 #define MGCP_DTMF_RFC2833  (1 << 0)
00116 #define MGCP_DTMF_INBAND   (1 << 1)
00117 #define MGCP_DTMF_HYBRID   (1 << 2)
00118 
00119 #define DEFAULT_MGCP_GW_PORT  2427 /*!< From RFC 2705 */
00120 #define DEFAULT_MGCP_CA_PORT  2727 /*!< From RFC 2705 */
00121 #define MGCP_MAX_PACKET    1500 /*!< Also from RFC 2543, should sub headers tho */
00122 #define DEFAULT_RETRANS    1000 /*!< How frequently to retransmit */
00123 #define MAX_RETRANS     5    /*!< Try only 5 times for retransmissions */
00124 
00125 /*! MGCP rtp stream modes { */
00126 #define MGCP_CX_SENDONLY   0
00127 #define MGCP_CX_RECVONLY   1
00128 #define MGCP_CX_SENDRECV   2
00129 #define MGCP_CX_CONF    3
00130 #define MGCP_CX_CONFERENCE 3
00131 #define MGCP_CX_MUTE    4
00132 #define MGCP_CX_INACTIVE   4
00133 /*! } */
00134 
00135 static char *mgcp_cxmodes[] = {
00136    "sendonly",
00137    "recvonly",
00138    "sendrecv",
00139    "confrnce",
00140    "inactive"
00141 };
00142 
00143 enum {
00144    MGCP_CMD_EPCF,
00145    MGCP_CMD_CRCX,
00146    MGCP_CMD_MDCX,
00147    MGCP_CMD_DLCX,
00148    MGCP_CMD_RQNT,
00149    MGCP_CMD_NTFY,
00150    MGCP_CMD_AUEP,
00151    MGCP_CMD_AUCX,
00152    MGCP_CMD_RSIP
00153 };
00154 
00155 static char context[AST_MAX_EXTENSION] = "default";
00156 
00157 static char language[MAX_LANGUAGE] = "";
00158 static char musicclass[MAX_MUSICCLASS] = "";
00159 static char cid_num[AST_MAX_EXTENSION] = "";
00160 static char cid_name[AST_MAX_EXTENSION] = "";
00161 
00162 static int dtmfmode = 0;
00163 static int nat = 0;
00164 
00165 static ast_group_t cur_callergroup = 0;
00166 static ast_group_t cur_pickupgroup = 0;
00167 
00168 static int tos = 0;
00169 
00170 static int immediate = 0;
00171 
00172 static int callwaiting = 0;
00173 
00174 static int callreturn = 0;
00175 
00176 static int slowsequence = 0;
00177 
00178 static int threewaycalling = 0;
00179 
00180 /*! This is for flashhook transfers */
00181 static int transfer = 0;
00182 
00183 static int cancallforward = 0;
00184 
00185 static int singlepath = 0;
00186 
00187 static int canreinvite = CANREINVITE;
00188 
00189 static char accountcode[AST_MAX_ACCOUNT_CODE] = "";
00190 
00191 static char mailbox[AST_MAX_EXTENSION];
00192 
00193 static int amaflags = 0;
00194 
00195 static int adsi = 0;
00196 
00197 static unsigned int oseq;
00198 
00199 /*! Wait up to 16 seconds for first digit (FXO logic) */
00200 static int firstdigittimeout = 16000;
00201 
00202 /*! How long to wait for following digits (FXO logic) */
00203 static int gendigittimeout = 8000;
00204 
00205 /*! How long to wait for an extra digit, if there is an ambiguous match */
00206 static int matchdigittimeout = 3000;
00207 
00208 /*! Protect the monitoring thread, so only one process can kill or start it, and not
00209     when it's doing something critical. */
00210 AST_MUTEX_DEFINE_STATIC(netlock);
00211 
00212 AST_MUTEX_DEFINE_STATIC(monlock);
00213 
00214 /*! This is the thread for the monitor which checks for input on the channels
00215     which are not currently in use. */
00216 static pthread_t monitor_thread = AST_PTHREADT_NULL;
00217 
00218 static int restart_monitor(void);
00219 
00220 static int capability = AST_FORMAT_ULAW;
00221 static int nonCodecCapability = AST_RTP_DTMF;
00222 
00223 static char ourhost[MAXHOSTNAMELEN];
00224 static struct in_addr __ourip;
00225 static int ourport;
00226 
00227 static int mgcpdebug = 0;
00228 
00229 static struct sched_context *sched;
00230 static struct io_context *io;
00231 /*! The private structures of the  mgcp channels are linked for
00232   ! selecting outgoing channels */
00233    
00234 #define MGCP_MAX_HEADERS   64
00235 #define MGCP_MAX_LINES     64
00236 
00237 struct mgcp_request {
00238    int len;
00239    char *verb;
00240    char *identifier;
00241    char *endpoint;
00242    char *version;
00243    int headers;         /*!< MGCP Headers */
00244    char *header[MGCP_MAX_HEADERS];
00245    int lines;        /*!< SDP Content */
00246    char *line[MGCP_MAX_LINES];
00247    char data[MGCP_MAX_PACKET];
00248    int cmd;                        /*!< int version of verb = command */
00249    unsigned int trid;              /*!< int version of identifier = transaction id */
00250    struct mgcp_request *next;      /*!< next in the queue */
00251 };
00252 
00253 /*! \brief mgcp_message: MGCP message for queuing up */
00254 struct mgcp_message {
00255    struct mgcp_endpoint *owner_ep;
00256    struct mgcp_subchannel *owner_sub;
00257    int retrans;
00258    unsigned long expire;
00259    unsigned int seqno;
00260    int len;
00261    struct mgcp_message *next;
00262    char buf[0];
00263 };
00264 
00265 #define RESPONSE_TIMEOUT 30   /*!< in seconds */
00266 
00267 struct mgcp_response {
00268    time_t whensent;
00269    int len;
00270    int seqno;
00271    struct mgcp_response *next;
00272    char buf[0];
00273 };
00274 
00275 #define MAX_SUBS 2
00276 
00277 #define SUB_REAL 0
00278 #define SUB_ALT  1
00279 
00280 struct mgcp_subchannel {
00281    /*! subchannel magic string. 
00282       Needed to prove that any subchannel pointer passed by asterisk 
00283       really points to a valid subchannel memory area.
00284       Ugly.. But serves the purpose for the time being.
00285     */
00286 #define MGCP_SUBCHANNEL_MAGIC "!978!"
00287    char magic[6]; 
00288    ast_mutex_t lock;
00289    int id;
00290    struct ast_channel *owner;
00291    struct mgcp_endpoint *parent;
00292    struct ast_rtp *rtp;
00293    struct sockaddr_in tmpdest;
00294    char txident[80]; /*! \todo FIXME txident is replaced by rqnt_ident in endpoint. 
00295          This should be obsoleted */
00296    char cxident[80];
00297    char callid[80];
00298    int cxmode;
00299    struct mgcp_request *cx_queue; /*!< pending CX commands */
00300    ast_mutex_t cx_queue_lock;     /*!< CX queue lock */
00301    int nat;
00302    int iseq;                      /*!< Not used? RTP? */
00303    int outgoing;
00304    int alreadygone;
00305    struct mgcp_subchannel *next;  /*!< for out circular linked list */
00306 };
00307 
00308 #define MGCP_ONHOOK  1
00309 #define MGCP_OFFHOOK 2
00310 
00311 #define TYPE_TRUNK 1
00312 #define TYPE_LINE  2
00313 
00314 struct mgcp_endpoint {
00315    ast_mutex_t lock;
00316    char name[80];
00317    struct mgcp_subchannel *sub;     /*!< Pointer to our current connection, channel and stuff */
00318    char accountcode[AST_MAX_ACCOUNT_CODE];
00319    char exten[AST_MAX_EXTENSION];      /*!< Extention where to start */
00320    char context[AST_MAX_EXTENSION];
00321    char language[MAX_LANGUAGE];
00322    char cid_num[AST_MAX_EXTENSION]; /*!< Caller*ID number */
00323    char cid_name[AST_MAX_EXTENSION];   /*!< Caller*ID name */
00324    char lastcallerid[AST_MAX_EXTENSION];  /*!< Last Caller*ID */
00325    char call_forward[AST_MAX_EXTENSION];  /*!< Last Caller*ID */
00326    char mailbox[AST_MAX_EXTENSION];
00327    char musicclass[MAX_MUSICCLASS];
00328    char curtone[80];       /*!< Current tone */
00329    char dtmf_buf[AST_MAX_EXTENSION];   /*!< place to collect digits be */
00330    ast_group_t callgroup;
00331    ast_group_t pickupgroup;
00332    int callwaiting;
00333    int hascallwaiting;
00334    int transfer;
00335    int threewaycalling;
00336    int singlepath;
00337    int cancallforward;
00338    int canreinvite;
00339    int callreturn;
00340    int dnd; /* How does this affect callwait? Do we just deny a mgcp_request if we're dnd? */
00341    int hascallerid;
00342    int hidecallerid;
00343    int dtmfmode;
00344    int amaflags;
00345    int type;
00346    int slowsequence;       /*!< MS: Sequence the endpoint as a whole */
00347    int group;
00348    int iseq; /*!< Not used? */
00349    int lastout; /*!< tracking this on the subchannels.  Is it needed here? */
00350    int needdestroy; /*!< Not used? */
00351    int capability;
00352    int nonCodecCapability;
00353    int onhooktime;
00354    int msgstate; /*!< voicemail message state */
00355    int immediate;
00356    int hookstate;
00357    int adsi;
00358    char rqnt_ident[80];             /*!< request identifier */
00359    struct mgcp_request *rqnt_queue; /*!< pending RQNT commands */
00360    ast_mutex_t rqnt_queue_lock;
00361    struct mgcp_request *cmd_queue;  /*!< pending commands other than RQNT */
00362    ast_mutex_t cmd_queue_lock;
00363    int delme;                       /*!< needed for reload */
00364    int needaudit;                   /*!< needed for reload */
00365    struct ast_dsp *dsp; /*!< XXX Should there be a dsp/subchannel? XXX */
00366    /* owner is tracked on the subchannels, and the *sub indicates whos in charge */
00367    /* struct ast_channel *owner; */
00368    /* struct ast_rtp *rtp; */
00369    /* struct sockaddr_in tmpdest; */
00370    /* message go the the endpoint and not the channel so they stay here */
00371    struct mgcp_endpoint *next;
00372    struct mgcp_gateway *parent;
00373 };
00374 
00375 static struct mgcp_gateway {
00376    /* A gateway containing one or more endpoints */
00377    char name[80];
00378    int isnamedottedip; /*!< is the name FQDN or dotted ip */
00379    struct sockaddr_in addr;
00380    struct sockaddr_in defaddr;
00381    struct in_addr ourip;
00382    int dynamic;
00383    int expire;    /*!< XXX Should we ever expire dynamic registrations? XXX */
00384    struct mgcp_endpoint *endpoints;
00385    struct ast_ha *ha;
00386 /* obsolete
00387    time_t lastouttime;
00388    int lastout;
00389    int messagepending;
00390 */
00391 /* Wildcard endpoint name */
00392    char wcardep[30];
00393    struct mgcp_message *msgs; /*!< gw msg queue */
00394    ast_mutex_t msgs_lock;     /*!< queue lock */  
00395    int retransid;             /*!< retrans timer id */
00396    int delme;                 /*!< needed for reload */
00397    struct mgcp_response *responses;
00398    struct mgcp_gateway *next;
00399 } *gateways;
00400 
00401 AST_MUTEX_DEFINE_STATIC(mgcp_reload_lock);
00402 static int mgcp_reloading = 0;
00403 
00404 /*! \brief gatelock: mutex for gateway/endpoint lists */
00405 AST_MUTEX_DEFINE_STATIC(gatelock);
00406 
00407 static int mgcpsock  = -1;
00408 
00409 static struct sockaddr_in bindaddr;
00410 
00411 static struct ast_frame  *mgcp_read(struct ast_channel *ast);
00412 static int transmit_response(struct mgcp_subchannel *sub, char *msg, struct mgcp_request *req, char *msgrest);
00413 static int transmit_notify_request(struct mgcp_subchannel *sub, char *tone);
00414 static int transmit_modify_request(struct mgcp_subchannel *sub);
00415 static int transmit_notify_request_with_callerid(struct mgcp_subchannel *sub, char *tone, char *callernum, char *callername);
00416 static int transmit_modify_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp *rtp, int codecs);
00417 static int transmit_connection_del(struct mgcp_subchannel *sub);
00418 static int transmit_audit_endpoint(struct mgcp_endpoint *p);
00419 static void start_rtp(struct mgcp_subchannel *sub);
00420 static void handle_response(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,  
00421                             int result, unsigned int ident, struct mgcp_request *resp);
00422 static void dump_cmd_queues(struct mgcp_endpoint *p, struct mgcp_subchannel *sub);
00423 static int mgcp_do_reload(void);
00424 static int mgcp_reload(int fd, int argc, char *argv[]);
00425 
00426 static struct ast_channel *mgcp_request(const char *type, int format, void *data, int *cause);
00427 static int mgcp_call(struct ast_channel *ast, char *dest, int timeout);
00428 static int mgcp_hangup(struct ast_channel *ast);
00429 static int mgcp_answer(struct ast_channel *ast);
00430 static struct ast_frame *mgcp_read(struct ast_channel *ast);
00431 static int mgcp_write(struct ast_channel *ast, struct ast_frame *frame);
00432 static int mgcp_indicate(struct ast_channel *ast, int ind, const void *data, size_t datalen);
00433 static int mgcp_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
00434 static int mgcp_senddigit_begin(struct ast_channel *ast, char digit);
00435 static int mgcp_senddigit_end(struct ast_channel *ast, char digit, unsigned int duration);
00436 static int mgcp_devicestate(void *data);
00437 static void add_header_offhook(struct mgcp_subchannel *sub, struct mgcp_request *resp);
00438 
00439 static const struct ast_channel_tech mgcp_tech = {
00440    .type = "MGCP",
00441    .description = tdesc,
00442    .capabilities = AST_FORMAT_ULAW,
00443    .properties = AST_CHAN_TP_WANTSJITTER | AST_CHAN_TP_CREATESJITTER,
00444    .requester = mgcp_request,
00445    .devicestate = mgcp_devicestate,
00446    .call = mgcp_call,
00447    .hangup = mgcp_hangup,
00448    .answer = mgcp_answer,
00449    .read = mgcp_read,
00450    .write = mgcp_write,
00451    .indicate = mgcp_indicate,
00452    .fixup = mgcp_fixup,
00453    .send_digit_begin = mgcp_senddigit_begin,
00454    .send_digit_end = mgcp_senddigit_end,
00455    .bridge = ast_rtp_bridge,
00456 };
00457 
00458 static int has_voicemail(struct mgcp_endpoint *p)
00459 {
00460    return ast_app_has_voicemail(p->mailbox, NULL);
00461 }
00462 
00463 static int unalloc_sub(struct mgcp_subchannel *sub)
00464 {
00465    struct mgcp_endpoint *p = sub->parent;
00466    if (p->sub == sub) {
00467       ast_log(LOG_WARNING, "Trying to unalloc the real channel %s@%s?!?\n", p->name, p->parent->name);
00468       return -1;
00469    }
00470    ast_log(LOG_DEBUG, "Released sub %d of channel %s@%s\n", sub->id, p->name, p->parent->name);
00471 
00472    sub->owner = NULL;
00473    if (!ast_strlen_zero(sub->cxident)) {
00474       transmit_connection_del(sub);
00475    }
00476    sub->cxident[0] = '\0';
00477    sub->callid[0] = '\0';
00478    sub->cxmode = MGCP_CX_INACTIVE;
00479    sub->outgoing = 0;
00480    sub->alreadygone = 0;
00481    memset(&sub->tmpdest, 0, sizeof(sub->tmpdest));
00482    if (sub->rtp) {
00483       ast_rtp_destroy(sub->rtp);
00484       sub->rtp = NULL;
00485    }
00486    dump_cmd_queues(NULL, sub); /* SC */
00487    return 0;
00488 }
00489 
00490 /* modified for new transport mechanism */
00491 static int __mgcp_xmit(struct mgcp_gateway *gw, char *data, int len)
00492 {
00493    int res;
00494    if (gw->addr.sin_addr.s_addr)
00495       res=sendto(mgcpsock, data, len, 0, (struct sockaddr *)&gw->addr, sizeof(struct sockaddr_in));
00496    else 
00497       res=sendto(mgcpsock, data, len, 0, (struct sockaddr *)&gw->defaddr, sizeof(struct sockaddr_in));
00498    if (res != len) {
00499       ast_log(LOG_WARNING, "mgcp_xmit returned %d: %s\n", res, strerror(errno));
00500    }
00501    return res;
00502 }
00503 
00504 static int resend_response(struct mgcp_subchannel *sub, struct mgcp_response *resp)
00505 {
00506    struct mgcp_endpoint *p = sub->parent;
00507    int res;
00508    if (mgcpdebug) {
00509       ast_verbose("Retransmitting:\n%s\n to %s:%d\n", resp->buf, ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
00510    }
00511    res = __mgcp_xmit(p->parent, resp->buf, resp->len);
00512    if (res > 0)
00513       res = 0;
00514    return res;
00515 }
00516 
00517 static int send_response(struct mgcp_subchannel *sub, struct mgcp_request *req)
00518 {
00519    struct mgcp_endpoint *p = sub->parent;
00520    int res;
00521    if (mgcpdebug) {
00522       ast_verbose("Transmitting:\n%s\n to %s:%d\n", req->data, ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
00523    }
00524    res = __mgcp_xmit(p->parent, req->data, req->len);
00525    if (res > 0)
00526       res = 0;
00527    return res;
00528 }
00529 
00530 /* modified for new transport framework */
00531 static void dump_queue(struct mgcp_gateway *gw, struct mgcp_endpoint *p)
00532 {
00533    struct mgcp_message *cur, *q = NULL, *w, *prev;
00534 
00535    ast_mutex_lock(&gw->msgs_lock);
00536    prev = NULL, cur = gw->msgs;
00537    while (cur) {
00538       if (!p || cur->owner_ep == p) {
00539          if (prev)
00540             prev->next = cur->next;
00541          else
00542             gw->msgs = cur->next;
00543 
00544          ast_log(LOG_NOTICE, "Removing message from %s transaction %u\n", 
00545             gw->name, cur->seqno);
00546 
00547          w = cur;
00548          cur = cur->next;
00549          if (q) {
00550             w->next = q;
00551          } else {
00552             w->next = NULL;
00553          }
00554          q = w;
00555       } else {
00556          prev = cur, cur=cur->next;
00557       }
00558    }
00559    ast_mutex_unlock(&gw->msgs_lock);
00560 
00561    while (q) {
00562       cur = q;
00563       q = q->next;
00564       free(cur);
00565    }
00566 }
00567 
00568 static void mgcp_queue_frame(struct mgcp_subchannel *sub, struct ast_frame *f)
00569 {
00570    for(;;) {
00571       if (sub->owner) {
00572          if (!ast_mutex_trylock(&sub->owner->lock)) {
00573             ast_queue_frame(sub->owner, f);
00574             ast_mutex_unlock(&sub->owner->lock);
00575             break;
00576          } else {
00577             DEADLOCK_AVOIDANCE(&sub->lock);
00578          }
00579       } else
00580          break;
00581    }
00582 }
00583 
00584 static void mgcp_queue_hangup(struct mgcp_subchannel *sub)
00585 {
00586    for(;;) {
00587       if (sub->owner) {
00588          if (!ast_mutex_trylock(&sub->owner->lock)) {
00589             ast_queue_hangup(sub->owner);
00590             ast_mutex_unlock(&sub->owner->lock);
00591             break;
00592          } else {
00593             DEADLOCK_AVOIDANCE(&sub->lock);
00594          }
00595       } else
00596          break;
00597    }
00598 }
00599 
00600 static void mgcp_queue_control(struct mgcp_subchannel *sub, int control)
00601 {
00602    struct ast_frame f = { AST_FRAME_CONTROL, };
00603    f.subclass = control;
00604    return mgcp_queue_frame(sub, &f);
00605 }
00606 
00607 static int retrans_pkt(const void *data)
00608 {
00609    struct mgcp_gateway *gw = (struct mgcp_gateway *)data;
00610    struct mgcp_message *cur, *exq = NULL, *w, *prev;
00611    int res = 0;
00612 
00613    /* find out expired msgs */
00614    ast_mutex_lock(&gw->msgs_lock);
00615 
00616    prev = NULL, cur = gw->msgs;
00617    while (cur) {
00618       if (cur->retrans < MAX_RETRANS) {
00619          cur->retrans++;
00620          if (mgcpdebug) {
00621             ast_verbose("Retransmitting #%d transaction %u on [%s]\n",
00622                cur->retrans, cur->seqno, gw->name);
00623          }
00624          __mgcp_xmit(gw, cur->buf, cur->len);
00625 
00626          prev = cur;
00627          cur = cur->next;
00628       } else {
00629          if (prev)
00630             prev->next = cur->next;
00631          else
00632             gw->msgs = cur->next;
00633 
00634          ast_log(LOG_WARNING, "Maximum retries exceeded for transaction %u on [%s]\n",
00635             cur->seqno, gw->name);
00636 
00637          w = cur;
00638          cur = cur->next;
00639 
00640          if (exq) {
00641             w->next = exq;
00642          } else {
00643             w->next = NULL;
00644          }
00645          exq = w;
00646       }
00647    }
00648 
00649    if (!gw->msgs) {
00650       gw->retransid = -1;
00651       res = 0;
00652    } else {
00653       res = 1;
00654    }
00655    ast_mutex_unlock(&gw->msgs_lock);
00656 
00657    while (exq) {
00658       cur = exq;
00659       /* time-out transaction */
00660       handle_response(cur->owner_ep, cur->owner_sub, 406, cur->seqno, NULL); 
00661       exq = exq->next;
00662       free(cur);
00663    }
00664 
00665    return res;
00666 }
00667 
00668 /* modified for the new transaction mechanism */
00669 static int mgcp_postrequest(struct mgcp_endpoint *p, struct mgcp_subchannel *sub, 
00670                             char *data, int len, unsigned int seqno)
00671 {
00672    struct mgcp_message *msg = malloc(sizeof(struct mgcp_message) + len);
00673    struct mgcp_message *cur;
00674    struct mgcp_gateway *gw = ((p && p->parent) ? p->parent : NULL);
00675    struct timeval tv;
00676 
00677    if (!msg) {
00678       return -1;
00679    }
00680    if (!gw) {
00681       return -1;
00682    }
00683 /* SC
00684    time(&t);
00685    if (gw->messagepending && (gw->lastouttime + 20 < t)) {
00686       ast_log(LOG_NOTICE, "Timeout waiting for response to message:%d,  lastouttime: %ld, now: %ld.  Dumping pending queue\n",
00687          gw->msgs ? gw->msgs->seqno : -1, (long) gw->lastouttime, (long) t);
00688       dump_queue(sub->parent);
00689    }
00690 */
00691    msg->owner_sub = sub;
00692    msg->owner_ep = p;
00693    msg->seqno = seqno;
00694    msg->next = NULL;
00695    msg->len = len;
00696    msg->retrans = 0;
00697    memcpy(msg->buf, data, msg->len);
00698 
00699    ast_mutex_lock(&gw->msgs_lock);
00700    cur = gw->msgs;
00701    if (cur) {
00702       while(cur->next)
00703          cur = cur->next;
00704       cur->next = msg;
00705    } else {
00706       gw->msgs = msg;
00707    }
00708 
00709    if (gettimeofday(&tv, NULL) < 0) {
00710       /* This shouldn't ever happen, but let's be sure */
00711       ast_log(LOG_NOTICE, "gettimeofday() failed!\n");
00712    } else {
00713       msg->expire = tv.tv_sec * 1000 + tv.tv_usec / 1000 + DEFAULT_RETRANS;
00714 
00715       if (gw->retransid == -1)
00716          gw->retransid = ast_sched_add(sched, DEFAULT_RETRANS, retrans_pkt, (void *)gw);
00717    }
00718    ast_mutex_unlock(&gw->msgs_lock);
00719 /* SC
00720    if (!gw->messagepending) {
00721       gw->messagepending = 1;
00722       gw->lastout = seqno;
00723       gw->lastouttime = t;
00724 */
00725    __mgcp_xmit(gw, msg->buf, msg->len);
00726       /* XXX Should schedule retransmission XXX */
00727 /* SC
00728    } else
00729       ast_log(LOG_DEBUG, "Deferring transmission of transaction %d\n", seqno);
00730 */
00731    return 0;
00732 }
00733 
00734 /* modified for new transport */
00735 static int send_request(struct mgcp_endpoint *p, struct mgcp_subchannel *sub, 
00736                         struct mgcp_request *req, unsigned int seqno)
00737 {
00738    int res = 0;
00739    struct mgcp_request **queue, *q, *r, *t;
00740    ast_mutex_t *l;
00741 
00742    ast_log(LOG_DEBUG, "Slow sequence is %d\n", p->slowsequence);
00743    if (p->slowsequence) {
00744       queue = &p->cmd_queue;
00745       l = &p->cmd_queue_lock;
00746       ast_mutex_lock(l);
00747    } else {
00748       switch (req->cmd) {
00749       case MGCP_CMD_DLCX:
00750          queue = &sub->cx_queue;
00751          l = &sub->cx_queue_lock;
00752          ast_mutex_lock(l);
00753          q = sub->cx_queue;
00754          /* delete pending cx cmds */
00755          while (q) {
00756             r = q->next;
00757             free(q);
00758             q = r;
00759          }
00760          *queue = NULL;
00761          break;
00762 
00763       case MGCP_CMD_CRCX:
00764       case MGCP_CMD_MDCX:
00765          queue = &sub->cx_queue;
00766          l = &sub->cx_queue_lock;
00767          ast_mutex_lock(l);
00768          break;
00769 
00770       case MGCP_CMD_RQNT:
00771          queue = &p->rqnt_queue;
00772          l = &p->rqnt_queue_lock;
00773          ast_mutex_lock(l);
00774          break;
00775 
00776       default:
00777          queue = &p->cmd_queue;
00778          l = &p->cmd_queue_lock;
00779          ast_mutex_lock(l);
00780          break;
00781       }
00782    }
00783 
00784    r = (struct mgcp_request *) malloc (sizeof(struct mgcp_request));
00785    if (!r) {
00786       ast_log(LOG_WARNING, "Cannot post MGCP request: insufficient memory\n");
00787       ast_mutex_unlock(l);
00788       return -1;
00789    }
00790    memcpy(r, req, sizeof(struct mgcp_request));
00791 
00792    if (!(*queue)) {
00793       if (mgcpdebug) {
00794          ast_verbose("Posting Request:\n%s to %s:%d\n", req->data, 
00795             ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
00796       }
00797 
00798       res = mgcp_postrequest(p, sub, req->data, req->len, seqno);
00799    } else {
00800       if (mgcpdebug) {
00801          ast_verbose("Queueing Request:\n%s to %s:%d\n", req->data, 
00802             ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
00803       }
00804    }
00805 
00806    /* XXX find tail. We could also keep tail in the data struct for faster access */
00807    for (t = *queue; t && t->next; t = t->next);
00808 
00809    r->next = NULL;
00810    if (t)
00811       t->next = r;
00812    else
00813       *queue = r;
00814 
00815    ast_mutex_unlock(l);
00816 
00817    return res;
00818 }
00819 
00820 static int mgcp_call(struct ast_channel *ast, char *dest, int timeout)
00821 {
00822    int res;
00823    struct mgcp_endpoint *p;
00824    struct mgcp_subchannel *sub;
00825    char tone[50] = "";
00826    const char *distinctive_ring = NULL;
00827    struct varshead *headp;
00828    struct ast_var_t *current;
00829 
00830    if (mgcpdebug) {
00831       ast_verbose(VERBOSE_PREFIX_3 "MGCP mgcp_call(%s)\n", ast->name);
00832    }
00833    sub = ast->tech_pvt;
00834    p = sub->parent;
00835    headp = &ast->varshead;
00836    AST_LIST_TRAVERSE(headp,current,entries) {
00837       /* Check whether there is an ALERT_INFO variable */
00838       if (strcasecmp(ast_var_name(current),"ALERT_INFO") == 0) {
00839          distinctive_ring = ast_var_value(current);
00840       }
00841    }
00842 
00843    ast_mutex_lock(&sub->lock);
00844    switch (p->hookstate) {
00845    case MGCP_OFFHOOK:
00846       if (!ast_strlen_zero(distinctive_ring)) {
00847          snprintf(tone, sizeof(tone), "L/wt%s", distinctive_ring);
00848          if (mgcpdebug) {
00849             ast_verbose(VERBOSE_PREFIX_3 "MGCP distinctive callwait %s\n", tone);
00850          }
00851       } else {
00852          snprintf(tone, sizeof(tone), "L/wt");
00853          if (mgcpdebug) {
00854             ast_verbose(VERBOSE_PREFIX_3 "MGCP normal callwait %s\n", tone);
00855          }
00856       }
00857       break;
00858    case MGCP_ONHOOK:
00859    default:
00860       if (!ast_strlen_zero(distinctive_ring)) {
00861          snprintf(tone, sizeof(tone), "L/r%s", distinctive_ring);
00862          if (mgcpdebug) {
00863             ast_verbose(VERBOSE_PREFIX_3 "MGCP distinctive ring %s\n", tone);
00864          }
00865       } else {
00866          snprintf(tone, sizeof(tone), "L/rg");
00867          if (mgcpdebug) {
00868             ast_verbose(VERBOSE_PREFIX_3 "MGCP default ring\n");
00869          }
00870       }
00871       break;
00872    }
00873 
00874    if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
00875       ast_log(LOG_WARNING, "mgcp_call called on %s, neither down nor reserved\n", ast->name);
00876       ast_mutex_unlock(&sub->lock);
00877       return -1;
00878    }
00879 
00880    res = 0;
00881    sub->outgoing = 1;
00882    sub->cxmode = MGCP_CX_RECVONLY;
00883    if (p->type == TYPE_LINE) {
00884       if (!sub->rtp) {
00885          start_rtp(sub);
00886       } else {
00887          transmit_modify_request(sub);
00888       }
00889 
00890       if (sub->next->owner && !ast_strlen_zero(sub->next->cxident) && !ast_strlen_zero(sub->next->callid)) {
00891          /* try to prevent a callwait from disturbing the other connection */
00892          sub->next->cxmode = MGCP_CX_RECVONLY;
00893          transmit_modify_request(sub->next);
00894       }
00895 
00896       transmit_notify_request_with_callerid(sub, tone, ast->cid.cid_num, ast->cid.cid_name);
00897       ast_setstate(ast, AST_STATE_RINGING);
00898 
00899       if (sub->next->owner && !ast_strlen_zero(sub->next->cxident) && !ast_strlen_zero(sub->next->callid)) {
00900          /* Put the connection back in sendrecv */
00901          sub->next->cxmode = MGCP_CX_SENDRECV;
00902          transmit_modify_request(sub->next);
00903       }
00904    } else {
00905       ast_log(LOG_NOTICE, "Don't know how to dial on trunks yet\n");
00906       res = -1;
00907    }
00908    ast_mutex_unlock(&sub->lock);
00909    ast_queue_control(ast, AST_CONTROL_RINGING);
00910    return res;
00911 }
00912 
00913 static int mgcp_hangup(struct ast_channel *ast)
00914 {
00915    struct mgcp_subchannel *sub = ast->tech_pvt;
00916    struct mgcp_endpoint *p = sub->parent;
00917 
00918    if (option_debug) {
00919       ast_log(LOG_DEBUG, "mgcp_hangup(%s)\n", ast->name);
00920    }
00921    if (!ast->tech_pvt) {
00922       ast_log(LOG_DEBUG, "Asked to hangup channel not connected\n");
00923       return 0;
00924    }
00925    if (strcmp(sub->magic, MGCP_SUBCHANNEL_MAGIC)) {
00926       ast_log(LOG_DEBUG, "Invalid magic. MGCP subchannel freed up already.\n");
00927       return 0;
00928    }
00929    ast_mutex_lock(&sub->lock);
00930    if (mgcpdebug) {
00931       ast_verbose(VERBOSE_PREFIX_3 "MGCP mgcp_hangup(%s) on %s@%s\n", ast->name, p->name, p->parent->name);
00932    }
00933 
00934    if ((p->dtmfmode & MGCP_DTMF_INBAND) && p->dsp) {
00935       /* check whether other channel is active. */
00936       if (!sub->next->owner) {
00937          if (p->dtmfmode & MGCP_DTMF_HYBRID)
00938             p->dtmfmode &= ~MGCP_DTMF_INBAND;
00939          if (mgcpdebug) {
00940             ast_verbose(VERBOSE_PREFIX_2 "MGCP free dsp on %s@%s\n", p->name, p->parent->name);
00941          }
00942          ast_dsp_free(p->dsp);
00943          p->dsp = NULL;
00944       }
00945    }
00946 
00947    sub->owner = NULL;
00948    if (!ast_strlen_zero(sub->cxident)) {
00949       transmit_connection_del(sub);
00950    }
00951    sub->cxident[0] = '\0';
00952    if ((sub == p->sub) && sub->next->owner) {
00953       if (p->hookstate == MGCP_OFFHOOK) {
00954          if (sub->next->owner && ast_bridged_channel(sub->next->owner)) {
00955             transmit_notify_request_with_callerid(p->sub, "L/wt", ast_bridged_channel(sub->next->owner)->cid.cid_num, ast_bridged_channel(sub->next->owner)->cid.cid_name);
00956          }
00957       } else {
00958          /* set our other connection as the primary and swith over to it */
00959          p->sub = sub->next;
00960          p->sub->cxmode = MGCP_CX_RECVONLY;
00961          transmit_modify_request(p->sub);
00962          if (sub->next->owner && ast_bridged_channel(sub->next->owner)) {
00963             transmit_notify_request_with_callerid(p->sub, "L/rg", ast_bridged_channel(sub->next->owner)->cid.cid_num, ast_bridged_channel(sub->next->owner)->cid.cid_name);
00964          }
00965       }
00966 
00967    } else if ((sub == p->sub->next) && p->hookstate == MGCP_OFFHOOK) {
00968       transmit_notify_request(sub, "L/v");
00969    } else if (p->hookstate == MGCP_OFFHOOK) {
00970       transmit_notify_request(sub, "L/ro");
00971    } else {
00972       transmit_notify_request(sub, "");
00973    }
00974 
00975    ast->tech_pvt = NULL;
00976    sub->alreadygone = 0;
00977    sub->outgoing = 0;
00978    sub->cxmode = MGCP_CX_INACTIVE;
00979    sub->callid[0] = '\0';
00980    if (p) {
00981       memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
00982    }
00983    /* Reset temporary destination */
00984    memset(&sub->tmpdest, 0, sizeof(sub->tmpdest));
00985    if (sub->rtp) {
00986       ast_rtp_destroy(sub->rtp);
00987       sub->rtp = NULL;
00988    }
00989 
00990    ast_module_unref(ast_module_info->self);
00991 
00992    if ((p->hookstate == MGCP_ONHOOK) && (!sub->next->rtp)) {
00993       p->hidecallerid = 0;
00994       if (p->hascallwaiting && !p->callwaiting) {
00995          if (option_verbose > 2)
00996             ast_verbose(VERBOSE_PREFIX_3 "Enabling call waiting on %s\n", ast->name);
00997          p->callwaiting = -1;
00998       }
00999       if (has_voicemail(p)) {
01000          if (mgcpdebug) {
01001             ast_verbose(VERBOSE_PREFIX_3 "MGCP mgcp_hangup(%s) on %s@%s set vmwi(+)\n", 
01002                ast->name, p->name, p->parent->name);
01003          }
01004          transmit_notify_request(sub, "L/vmwi(+)");
01005       } else {
01006          if (mgcpdebug) {
01007             ast_verbose(VERBOSE_PREFIX_3 "MGCP mgcp_hangup(%s) on %s@%s set vmwi(-)\n", 
01008                ast->name, p->name, p->parent->name);
01009          }
01010          transmit_notify_request(sub, "L/vmwi(-)");
01011       }
01012    }
01013    ast_mutex_unlock(&sub->lock);
01014    return 0;
01015 }
01016 
01017 static int mgcp_show_endpoints(int fd, int argc, char *argv[])
01018 {
01019    struct mgcp_gateway  *g;
01020    struct mgcp_endpoint *e;
01021    int hasendpoints = 0;
01022 
01023    if (argc != 3) 
01024       return RESULT_SHOWUSAGE;
01025    ast_mutex_lock(&gatelock);
01026    g = gateways;
01027    while(g) {
01028       e = g->endpoints;
01029       ast_cli(fd, "Gateway '%s' at %s (%s)\n", g->name, g->addr.sin_addr.s_addr ? ast_inet_ntoa(g->addr.sin_addr) : ast_inet_ntoa(g->defaddr.sin_addr), g->dynamic ? "Dynamic" : "Static");
01030       while(e) {
01031          /* Don't show wilcard endpoint */
01032          if (strcmp(e->name, g->wcardep) !=0)
01033             ast_cli(fd, "   -- '%s@%s in '%s' is %s\n", e->name, g->name, e->context, e->sub->owner ? "active" : "idle");
01034          hasendpoints = 1;
01035          e = e->next;
01036       }
01037       if (!hasendpoints) {
01038          ast_cli(fd, "   << No Endpoints Defined >>     ");
01039       }
01040       g = g->next;
01041    }
01042    ast_mutex_unlock(&gatelock);
01043    return RESULT_SUCCESS;
01044 }
01045 
01046 static char show_endpoints_usage[] = 
01047 "Usage: mgcp show endpoints\n"
01048 "       Lists all endpoints known to the MGCP (Media Gateway Control Protocol) subsystem.\n";
01049 
01050 static char audit_endpoint_usage[] = 
01051 "Usage: mgcp audit endpoint <endpointid>\n"
01052 "       Lists the capabilities of an endpoint in the MGCP (Media Gateway Control Protocol) subsystem.\n"
01053 "       mgcp debug MUST be on to see the results of this command.\n";
01054 
01055 static char debug_usage[] = 
01056 "Usage: mgcp set debug\n"
01057 "       Enables dumping of MGCP packets for debugging purposes\n";
01058 
01059 static char no_debug_usage[] = 
01060 "Usage: mgcp set debug off\n"
01061 "       Disables dumping of MGCP packets for debugging purposes\n";
01062 
01063 static char mgcp_reload_usage[] =
01064 "Usage: mgcp reload\n"
01065 "       Reloads MGCP configuration from mgcp.conf\n"
01066 "       Deprecated:  please use 'reload chan_mgcp.so' instead.\n";
01067 
01068 static int mgcp_audit_endpoint(int fd, int argc, char *argv[])
01069 {
01070    struct mgcp_gateway  *g;
01071    struct mgcp_endpoint *e;
01072    int found = 0;
01073    char *ename,*gname, *c;
01074 
01075    if (!mgcpdebug) {
01076       return RESULT_SHOWUSAGE;
01077    }
01078    if (argc != 4) 
01079       return RESULT_SHOWUSAGE;
01080    /* split the name into parts by null */
01081    ename = argv[3];
01082    gname = ename;
01083    while (*gname) {
01084       if (*gname == '@') {
01085          *gname = 0;
01086          gname++;
01087          break;
01088       }
01089       gname++;
01090    }
01091    if (gname[0] == '[')
01092       gname++;
01093    if ((c = strrchr(gname, ']')))
01094       *c = '\0';
01095    ast_mutex_lock(&gatelock);
01096    g = gateways;
01097    while(g) {
01098       if (!strcasecmp(g->name, gname)) {
01099          e = g->endpoints;
01100          while(e) {
01101             if (!strcasecmp(e->name, ename)) {
01102                found = 1;
01103                transmit_audit_endpoint(e);
01104                break;
01105             }
01106             e = e->next;
01107          }
01108          if (found) {
01109             break;
01110          }
01111       }
01112       g = g->next;
01113    }
01114    if (!found) {
01115       ast_cli(fd, "   << Could not find endpoint >>     ");
01116    }
01117    ast_mutex_unlock(&gatelock);
01118    return RESULT_SUCCESS;
01119 }
01120 
01121 static int mgcp_do_debug(int fd, int argc, char *argv[])
01122 {
01123    if (argc != 3)
01124       return RESULT_SHOWUSAGE;
01125    mgcpdebug = 1;
01126    ast_cli(fd, "MGCP Debugging Enabled\n");
01127    return RESULT_SUCCESS;
01128 }
01129 
01130 static int mgcp_no_debug(int fd, int argc, char *argv[])
01131 {
01132    if (argc != 4)
01133       return RESULT_SHOWUSAGE;
01134    mgcpdebug = 0;
01135    ast_cli(fd, "MGCP Debugging Disabled\n");
01136    return RESULT_SUCCESS;
01137 }
01138 
01139 static struct ast_cli_entry cli_mgcp[] = {
01140    { { "mgcp", "audit", "endpoint", NULL },
01141    mgcp_audit_endpoint, "Audit specified MGCP endpoint",
01142    audit_endpoint_usage },
01143 
01144    { { "mgcp", "show", "endpoints", NULL },
01145    mgcp_show_endpoints, "List defined MGCP endpoints",
01146    show_endpoints_usage },
01147 
01148    { { "mgcp", "set", "debug", NULL },
01149    mgcp_do_debug, "Enable MGCP debugging",
01150    debug_usage },
01151 
01152    { { "mgcp", "set", "debug", "off", NULL },
01153    mgcp_no_debug, "Disable MGCP debugging",
01154    no_debug_usage },
01155 
01156    { { "mgcp", "reload", NULL },
01157    mgcp_reload, "Reload MGCP configuration",
01158    mgcp_reload_usage },
01159 };
01160 
01161 static int mgcp_answer(struct ast_channel *ast)
01162 {
01163    int res = 0;
01164    struct mgcp_subchannel *sub = ast->tech_pvt;
01165    struct mgcp_endpoint *p = sub->parent;
01166 
01167    ast_mutex_lock(&sub->lock);
01168    sub->cxmode = MGCP_CX_SENDRECV;
01169    if (!sub->rtp) {
01170       start_rtp(sub);
01171    } else {
01172       transmit_modify_request(sub);
01173    }
01174    /* verbose level check */
01175    if (option_verbose > 2) {
01176       ast_verbose(VERBOSE_PREFIX_3 "MGCP mgcp_answer(%s) on %s@%s-%d\n", 
01177          ast->name, p->name, p->parent->name, sub->id);
01178    }
01179    if (ast->_state != AST_STATE_UP) {
01180       ast_setstate(ast, AST_STATE_UP);
01181       if (option_debug)
01182          ast_log(LOG_DEBUG, "mgcp_answer(%s)\n", ast->name);
01183       transmit_notify_request(sub, "");
01184       transmit_modify_request(sub);
01185    }
01186    ast_mutex_unlock(&sub->lock);
01187    return res;
01188 }
01189 
01190 static struct ast_frame *mgcp_rtp_read(struct mgcp_subchannel *sub)
01191 {
01192    /* Retrieve audio/etc from channel.  Assumes sub->lock is already held. */
01193    struct ast_frame *f;
01194 
01195    f = ast_rtp_read(sub->rtp);
01196    /* Don't send RFC2833 if we're not supposed to */
01197    if (f && (f->frametype == AST_FRAME_DTMF) && !(sub->parent->dtmfmode & MGCP_DTMF_RFC2833))
01198       return &ast_null_frame;
01199    if (sub->owner) {
01200       /* We already hold the channel lock */
01201       if (f->frametype == AST_FRAME_VOICE) {
01202          if (f->subclass != sub->owner->nativeformats) {
01203             ast_log(LOG_DEBUG, "Oooh, format changed to %d\n", f->subclass);
01204             sub->owner->nativeformats = f->subclass;
01205             ast_set_read_format(sub->owner, sub->owner->readformat);
01206             ast_set_write_format(sub->owner, sub->owner->writeformat);
01207          }
01208          /* Courtesy fearnor aka alex@pilosoft.com */
01209          if ((sub->parent->dtmfmode & MGCP_DTMF_INBAND) && (sub->parent->dsp)) {
01210 #if 0
01211             ast_log(LOG_NOTICE, "MGCP ast_dsp_process\n");
01212 #endif
01213             f = ast_dsp_process(sub->owner, sub->parent->dsp, f);
01214          }
01215       }
01216    }
01217    return f;
01218 }
01219 
01220 
01221 static struct ast_frame *mgcp_read(struct ast_channel *ast)
01222 {
01223    struct ast_frame *f;
01224    struct mgcp_subchannel *sub = ast->tech_pvt;
01225    ast_mutex_lock(&sub->lock);
01226    f = mgcp_rtp_read(sub);
01227    ast_mutex_unlock(&sub->lock);
01228    return f;
01229 }
01230 
01231 static int mgcp_write(struct ast_channel *ast, struct ast_frame *frame)
01232 {
01233    struct mgcp_subchannel *sub = ast->tech_pvt;
01234    int res = 0;
01235    if (frame->frametype != AST_FRAME_VOICE) {
01236       if (frame->frametype == AST_FRAME_IMAGE)
01237          return 0;
01238       else {
01239          ast_log(LOG_WARNING, "Can't send %d type frames with MGCP write\n", frame->frametype);
01240          return 0;
01241       }
01242    } else {
01243       if (!(frame->subclass & ast->nativeformats)) {
01244          ast_log(LOG_WARNING, "Asked to transmit frame type %d, while native formats is %d (read/write = %d/%d)\n",
01245             frame->subclass, ast->nativeformats, ast->readformat, ast->writeformat);
01246          return -1;
01247       }
01248    }
01249    if (sub) {
01250       ast_mutex_lock(&sub->lock);
01251       if ((sub->parent->sub == sub) || !sub->parent->singlepath) {
01252          if (sub->rtp) {
01253             res =  ast_rtp_write(sub->rtp, frame);
01254          }
01255       }
01256       ast_mutex_unlock(&sub->lock);
01257    }
01258    return res;
01259 }
01260 
01261 static int mgcp_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
01262 {
01263    struct mgcp_subchannel *sub = newchan->tech_pvt;
01264 
01265    ast_mutex_lock(&sub->lock);
01266    ast_log(LOG_NOTICE, "mgcp_fixup(%s, %s)\n", oldchan->name, newchan->name);
01267    if (sub->owner != oldchan) {
01268       ast_mutex_unlock(&sub->lock);
01269       ast_log(LOG_WARNING, "old channel wasn't %p but was %p\n", oldchan, sub->owner);
01270       return -1;
01271    }
01272    sub->owner = newchan;
01273    ast_mutex_unlock(&sub->lock);
01274    return 0;
01275 }
01276 
01277 static int mgcp_senddigit_begin(struct ast_channel *ast, char digit)
01278 {
01279    struct mgcp_subchannel *sub = ast->tech_pvt;
01280    struct mgcp_endpoint *p = sub->parent;
01281    int res = 0;
01282 
01283    ast_mutex_lock(&sub->lock);
01284    if (p->dtmfmode & MGCP_DTMF_INBAND || p->dtmfmode & MGCP_DTMF_HYBRID) {
01285       ast_log(LOG_DEBUG, "Sending DTMF using inband/hybrid\n");
01286       res = -1; /* Let asterisk play inband indications */
01287    } else if (p->dtmfmode & MGCP_DTMF_RFC2833) {
01288       ast_log(LOG_DEBUG, "Sending DTMF using RFC2833");
01289       ast_rtp_senddigit_begin(sub->rtp, digit);
01290    } else {
01291       ast_log(LOG_ERROR, "Don't know about DTMF_MODE %d\n", p->dtmfmode);
01292    }
01293    ast_mutex_unlock(&sub->lock);
01294 
01295    return res;
01296 }
01297 
01298 static int mgcp_senddigit_end(struct ast_channel *ast, char digit, unsigned int duration)
01299 {
01300    struct mgcp_subchannel *sub = ast->tech_pvt;
01301    struct mgcp_endpoint *p = sub->parent;
01302    int res = 0;
01303    char tmp[4];
01304 
01305    ast_mutex_lock(&sub->lock);
01306    if (p->dtmfmode & MGCP_DTMF_INBAND || p->dtmfmode & MGCP_DTMF_HYBRID) {
01307       ast_log(LOG_DEBUG, "Stopping DTMF using inband/hybrid\n");
01308       res = -1; /* Tell Asterisk to stop inband indications */
01309    } else if (p->dtmfmode & MGCP_DTMF_RFC2833) {
01310       ast_log(LOG_DEBUG, "Stopping DTMF using RFC2833\n");
01311       tmp[0] = 'D';
01312       tmp[1] = '/';
01313       tmp[2] = digit;
01314       tmp[3] = '\0';
01315       transmit_notify_request(sub, tmp);
01316                 ast_rtp_senddigit_end(sub->rtp, digit);
01317    } else {
01318       ast_log(LOG_ERROR, "Don't know about DTMF_MODE %d\n", p->dtmfmode);
01319    }
01320    ast_mutex_unlock(&sub->lock);
01321 
01322    return res;
01323 }
01324 
01325 /*!
01326  *  \brief  mgcp_devicestate: channel callback for device status monitoring
01327  *  \param  data tech/resource name of MGCP device to query
01328  *
01329  * Callback for device state management in channel subsystem
01330  * to obtain device status (up/down) of a specific MGCP endpoint
01331  *
01332  *  \return device status result (from devicestate.h) AST_DEVICE_INVALID (not available) or AST_DEVICE_UNKNOWN (available but unknown state)
01333  */
01334 static int mgcp_devicestate(void *data)
01335 {
01336    struct mgcp_gateway  *g;
01337    struct mgcp_endpoint *e = NULL;
01338    char *tmp, *endpt, *gw;
01339    int ret = AST_DEVICE_INVALID;
01340 
01341    endpt = ast_strdupa(data);
01342    if ((tmp = strchr(endpt, '@'))) {
01343       *tmp++ = '\0';
01344       gw = tmp;
01345    } else
01346       goto error;
01347 
01348    ast_mutex_lock(&gatelock);
01349    g = gateways;
01350    while (g) {
01351       if (strcasecmp(g->name, gw) == 0) {
01352          e = g->endpoints;
01353          break;
01354       }
01355       g = g->next;
01356    }
01357 
01358    if (!e)
01359       goto error;
01360 
01361    while (e) {
01362       if (strcasecmp(e->name, endpt) == 0)
01363          break;
01364       e = e->next;
01365    }
01366 
01367    if (!e)
01368       goto error;
01369 
01370    /*
01371     * As long as the gateway/endpoint is valid, we'll
01372     * assume that the device is available and its state
01373     * can be tracked.
01374     */
01375    ret = AST_DEVICE_UNKNOWN;
01376 
01377 error:
01378    ast_mutex_unlock(&gatelock);
01379    return ret;
01380 }
01381 
01382 static char *control2str(int ind) {
01383    switch (ind) {
01384    case AST_CONTROL_HANGUP:
01385       return "Other end has hungup";
01386    case AST_CONTROL_RING:
01387       return "Local ring";
01388    case AST_CONTROL_RINGING:
01389       return "Remote end is ringing";
01390    case AST_CONTROL_ANSWER:
01391       return "Remote end has answered";
01392    case AST_CONTROL_BUSY:
01393       return "Remote end is busy";
01394    case AST_CONTROL_TAKEOFFHOOK:
01395       return "Make it go off hook";
01396    case AST_CONTROL_OFFHOOK:
01397       return "Line is off hook";
01398    case AST_CONTROL_CONGESTION:
01399       return "Congestion (circuits busy)";
01400    case AST_CONTROL_FLASH:
01401       return "Flash hook";
01402    case AST_CONTROL_WINK:
01403       return "Wink";
01404    case AST_CONTROL_OPTION:
01405       return "Set a low-level option";
01406    case AST_CONTROL_RADIO_KEY:
01407       return "Key Radio";
01408    case AST_CONTROL_RADIO_UNKEY:
01409       return "Un-Key Radio";
01410    }
01411    return "UNKNOWN";
01412 }
01413 
01414 static int mgcp_indicate(struct ast_channel *ast, int ind, const void *data, size_t datalen)
01415 {
01416    struct mgcp_subchannel *sub = ast->tech_pvt;
01417    int res = 0;
01418 
01419    if (mgcpdebug) {
01420       ast_verbose(VERBOSE_PREFIX_3 "MGCP asked to indicate %d '%s' condition on channel %s\n",
01421          ind, control2str(ind), ast->name);
01422    }
01423    ast_mutex_lock(&sub->lock);
01424    switch(ind) {
01425    case AST_CONTROL_RINGING:
01426 #ifdef DLINK_BUGGY_FIRMWARE   
01427       transmit_notify_request(sub, "rt");
01428 #else
01429       transmit_notify_request(sub, "G/rt");
01430 #endif      
01431       break;
01432    case AST_CONTROL_BUSY:
01433       transmit_notify_request(sub, "L/bz");
01434       break;
01435    case AST_CONTROL_CONGESTION:
01436       transmit_notify_request(sub, "G/cg");
01437       break;
01438    case AST_CONTROL_HOLD:
01439       ast_moh_start(ast, data, NULL);
01440       break;
01441    case AST_CONTROL_UNHOLD:
01442       ast_moh_stop(ast);
01443       break;
01444    case AST_CONTROL_SRCUPDATE:
01445       ast_rtp_new_source(sub->rtp);
01446       break;
01447    case -1:
01448       transmit_notify_request(sub, "");
01449       break;
01450    default:
01451       ast_log(LOG_WARNING, "Don't know how to indicate condition %d\n", ind);
01452       res = -1;
01453    }
01454    ast_mutex_unlock(&sub->lock);
01455    return res;
01456 }
01457 
01458 static struct ast_channel *mgcp_new(struct mgcp_subchannel *sub, int state)
01459 {
01460    struct ast_channel *tmp;
01461    struct mgcp_endpoint *i = sub->parent;
01462    int fmt;
01463 
01464    tmp = ast_channel_alloc(1, state, i->cid_num, i->cid_name, i->accountcode, i->exten, i->context, i->amaflags, "MGCP/%s@%s-%d", i->name, i->parent->name, sub->id);
01465    if (tmp) {
01466       tmp->tech = &mgcp_tech;
01467       tmp->nativeformats = i->capability;
01468       if (!tmp->nativeformats)
01469          tmp->nativeformats = capability;
01470       fmt = ast_best_codec(tmp->nativeformats);
01471       ast_string_field_build(tmp, name, "MGCP/%s@%s-%d", i->name, i->parent->name, sub->id);
01472       if (sub->rtp)
01473          tmp->fds[0] = ast_rtp_fd(sub->rtp);
01474       if (i->dtmfmode & (MGCP_DTMF_INBAND | MGCP_DTMF_HYBRID)) {
01475          i->dsp = ast_dsp_new();
01476          ast_dsp_set_features(i->dsp,DSP_FEATURE_DTMF_DETECT);
01477          /* this is to prevent clipping of dtmf tones during dsp processing */
01478          ast_dsp_digitmode(i->dsp, DSP_DIGITMODE_NOQUELCH);
01479       } else {
01480          i->dsp = NULL;
01481       }
01482       if (state == AST_STATE_RING)
01483          tmp->rings = 1;
01484       tmp->writeformat = fmt;
01485       tmp->rawwriteformat = fmt;
01486       tmp->readformat = fmt;
01487       tmp->rawreadformat = fmt;
01488       tmp->tech_pvt = sub;
01489       if (!ast_strlen_zero(i->language))
01490          ast_string_field_set(tmp, language, i->language);
01491       if (!ast_strlen_zero(i->accountcode))
01492          ast_string_field_set(tmp, accountcode, i->accountcode);
01493       if (i->amaflags)
01494          tmp->amaflags = i->amaflags;
01495       sub->owner = tmp;
01496       ast_module_ref(ast_module_info->self);
01497       tmp->callgroup = i->callgroup;
01498       tmp->pickupgroup = i->pickupgroup;
01499       ast_string_field_set(tmp, call_forward, i->call_forward);
01500       ast_copy_string(tmp->context, i->context, sizeof(tmp->context));
01501       ast_copy_string(tmp->exten, i->exten, sizeof(tmp->exten));
01502 
01503       /* Don't use ast_set_callerid() here because it will
01504        * generate a needless NewCallerID event */
01505       tmp->cid.cid_ani = ast_strdup(i->cid_num);
01506       
01507       if (!i->adsi)
01508          tmp->adsicpe = AST_ADSI_UNAVAILABLE;
01509       tmp->priority = 1;
01510       if (sub->rtp)
01511          ast_jb_configure(tmp, &global_jbconf);
01512       if (state != AST_STATE_DOWN) {
01513          if (ast_pbx_start(tmp)) {
01514             ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
01515             ast_hangup(tmp);
01516             tmp = NULL;
01517          }
01518       }
01519       /* verbose level check */
01520       if (option_verbose > 2) {
01521          ast_verbose(VERBOSE_PREFIX_3 "MGCP mgcp_new(%s) created in state: %s\n",
01522             tmp->name, ast_state2str(state));
01523       }
01524    } else {
01525       ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
01526    }
01527    return tmp;
01528 }
01529 
01530 static char* get_sdp_by_line(char* line, char *name, int nameLen)
01531 {
01532    if (strncasecmp(line, name, nameLen) == 0 && line[nameLen] == '=') {
01533       char* r = line + nameLen + 1;
01534       while (*r && (*r < 33)) ++r;
01535       return r;
01536    }
01537    return "";
01538 }
01539 
01540 static char *get_sdp(struct mgcp_request *req, char *name)
01541 {
01542    int x;
01543    int len = strlen(name);
01544    char *r;
01545 
01546    for (x=0; x<req->lines; x++) {
01547       r = get_sdp_by_line(req->line[x], name, len);
01548       if (r[0] != '\0') return r;
01549    }
01550    return "";
01551 }
01552 
01553 static void sdpLineNum_iterator_init(int* iterator)
01554 {
01555    *iterator = 0;
01556 }
01557 
01558 static char* get_sdp_iterate(int* iterator, struct mgcp_request *req, char *name)
01559 {
01560    int len = strlen(name);
01561    char *r;
01562    while (*iterator < req->lines) {
01563       r = get_sdp_by_line(req->line[(*iterator)++], name, len);
01564       if (r[0] != '\0') return r;
01565    }
01566    return "";
01567 }
01568 
01569 static char *__get_header(struct mgcp_request *req, char *name, int *start)
01570 {
01571    int x;
01572    int len = strlen(name);
01573    char *r;
01574    for (x=*start;x<req->headers;x++) {
01575       if (!strncasecmp(req->header[x], name, len) && 
01576           (req->header[x][len] == ':')) {
01577          r = req->header[x] + len + 1;
01578          while(*r && (*r < 33))
01579             r++;
01580          *start = x+1;
01581          return r;
01582       }
01583    }
01584    /* Don't return NULL, so get_header is always a valid pointer */
01585    return "";
01586 }
01587 
01588 static char *get_header(struct mgcp_request *req, char *name)
01589 {
01590    int start = 0;
01591    return __get_header(req, name, &start);
01592 }
01593 
01594 /*! \brief get_csv: (SC:) get comma separated value */
01595 static char *get_csv(char *c, int *len, char **next) 
01596 {
01597    char *s;
01598 
01599    *next = NULL, *len = 0;
01600    if (!c) return NULL;
01601 
01602    while (*c && (*c < 33 || *c == ','))
01603       c++;
01604 
01605    s = c;
01606    while (*c && (*c >= 33 && *c != ','))
01607       c++, (*len)++;
01608    *next = c;
01609 
01610    if (*len == 0)
01611       s = NULL, *next = NULL;
01612 
01613    return s;
01614 }
01615 
01616 static struct mgcp_subchannel *find_subchannel_and_lock(char *name, int msgid, struct sockaddr_in *sin)
01617 {
01618    struct mgcp_endpoint *p = NULL;
01619    struct mgcp_subchannel *sub = NULL;
01620    struct mgcp_gateway *g;
01621    char tmp[256] = "";
01622    char *at = NULL, *c;
01623    int found = 0;
01624    if (name) {
01625       ast_copy_string(tmp, name, sizeof(tmp));
01626       at = strchr(tmp, '@');
01627       if (!at) {
01628          ast_log(LOG_NOTICE, "Endpoint '%s' has no at sign!\n", name);
01629          return NULL;
01630       }
01631       *at++ = '\0';
01632    }
01633    ast_mutex_lock(&gatelock);
01634    if (at && (at[0] == '[')) {
01635       at++;
01636       c = strrchr(at, ']');
01637       if (c)
01638          *c = '\0';
01639    }
01640    g = gateways;
01641    while(g) {
01642       if ((!name || !strcasecmp(g->name, at)) && 
01643           (sin || g->addr.sin_addr.s_addr || g->defaddr.sin_addr.s_addr)) {
01644          /* Found the gateway.  If it's dynamic, save it's address -- now for the endpoint */
01645          if (sin && g->dynamic && name) {
01646             if ((g->addr.sin_addr.s_addr != sin->sin_addr.s_addr) ||
01647                (g->addr.sin_port != sin->sin_port)) {
01648                memcpy(&g->addr, sin, sizeof(g->addr));
01649                if (ast_ouraddrfor(&g->addr.sin_addr, &g->ourip))
01650                   memcpy(&g->ourip, &__ourip, sizeof(g->ourip));
01651                if (option_verbose > 2)
01652                   ast_verbose(VERBOSE_PREFIX_3 "Registered MGCP gateway '%s' at %s port %d\n", g->name, ast_inet_ntoa(g->addr.sin_addr), ntohs(g->addr.sin_port));
01653             }
01654          }
01655          /* not dynamic, check if the name matches */
01656          else if (name) {
01657             if (strcasecmp(g->name, at)) {
01658                g = g->next;
01659                continue;
01660             }
01661          }
01662          /* not dynamic, no name, check if the addr matches */
01663          else if (!name && sin) {
01664             if ((g->addr.sin_addr.s_addr != sin->sin_addr.s_addr) ||
01665                 (g->addr.sin_port != sin->sin_port)) {
01666                g = g->next;
01667                continue;
01668             }
01669          } else {
01670             g = g->next;
01671             continue;
01672          }
01673          /* SC */
01674          p = g->endpoints;
01675          while(p) {
01676             if (option_debug)
01677                ast_log(LOG_DEBUG, "Searching on %s@%s for subchannel\n",
01678                   p->name, g->name);
01679             if (msgid) {
01680 #if 0 /* new transport mech */
01681                sub = p->sub;
01682                do {
01683                   if (option_debug)
01684                      ast_log(LOG_DEBUG, "Searching on %s@%s-%d for subchannel with lastout: %d\n",
01685                         p->name, g->name, sub->id, msgid);
01686                   if (sub->lastout == msgid) {
01687                      if (option_debug)
01688                         ast_log(LOG_DEBUG, "Found subchannel sub%d to handle request %d sub->lastout: %d\n",
01689                            sub->id, msgid, sub->lastout);
01690                      found = 1;
01691                      break;
01692                   }
01693                   sub = sub->next;
01694                } while (sub != p->sub);
01695                if (found) {
01696                   break;
01697                }
01698 #endif
01699                /* SC */
01700                sub = p->sub;
01701                found = 1;
01702                /* SC */
01703                break;
01704             } else if (name && !strcasecmp(p->name, tmp)) {
01705                ast_log(LOG_DEBUG, "Coundn't determine subchannel, assuming current master %s@%s-%d\n", 
01706                   p->name, g->name, p->sub->id);
01707                sub = p->sub;
01708                found = 1;
01709                break;
01710             }
01711             p = p->next;
01712          }
01713          if (sub && found) {
01714             ast_mutex_lock(&sub->lock);
01715             break;
01716          }
01717       }
01718       g = g->next;
01719    }
01720    ast_mutex_unlock(&gatelock);
01721    if (!sub) {
01722       if (name) {
01723          if (g)
01724             ast_log(LOG_NOTICE, "Endpoint '%s' not found on gateway '%s'\n", tmp, at);
01725          else
01726             ast_log(LOG_NOTICE, "Gateway '%s' (and thus its endpoint '%s') does not exist\n", at, tmp);
01727       } 
01728    }
01729    return sub;
01730 }
01731 
01732 static void parse(struct mgcp_request *req)
01733 {
01734    /* Divide fields by NULL's */
01735    char *c;
01736    int f = 0;
01737    c = req->data;
01738 
01739    /* First header starts immediately */
01740    req->header[f] = c;
01741    while(*c) {
01742       if (*c == '\n') {
01743          /* We've got a new header */
01744          *c = 0;
01745 #if 0
01746          printf("Header: %s (%d)\n", req->header[f], strlen(req->header[f]));
01747 #endif         
01748          if (ast_strlen_zero(req->header[f])) {
01749             /* Line by itself means we're now in content */
01750             c++;
01751             break;
01752          }
01753          if (f >= MGCP_MAX_HEADERS - 1) {
01754             ast_log(LOG_WARNING, "Too many MGCP headers...\n");
01755          } else
01756             f++;
01757          req->header[f] = c + 1;
01758       } else if (*c == '\r') {
01759          /* Ignore but eliminate \r's */
01760          *c = 0;
01761       }
01762       c++;
01763    }
01764    /* Check for last header */
01765    if (!ast_strlen_zero(req->header[f])) 
01766       f++;
01767    req->headers = f;
01768    /* Now we process any mime content */
01769    f = 0;
01770    req->line[f] = c;
01771    while(*c) {
01772       if (*c == '\n') {
01773          /* We've got a new line */
01774          *c = 0;
01775 #if 0
01776          printf("Line: %s (%d)\n", req->line[f], strlen(req->line[f]));
01777 #endif         
01778          if (f >= MGCP_MAX_LINES - 1) {
01779             ast_log(LOG_WARNING, "Too many SDP lines...\n");
01780          } else
01781             f++;
01782          req->line[f] = c + 1;
01783       } else if (*c == '\r') {
01784          /* Ignore and eliminate \r's */
01785          *c = 0;
01786       }
01787       c++;
01788    }
01789    /* Check for last line */
01790    if (!ast_strlen_zero(req->line[f])) 
01791       f++;
01792    req->lines = f;
01793    /* Parse up the initial header */
01794    c = req->header[0];
01795    while(*c && *c < 33) c++;
01796    /* First the verb */
01797    req->verb = c;
01798    while(*c && (*c > 32)) c++;
01799    if (*c) {
01800       *c = '\0';
01801       c++;
01802       while(*c && (*c < 33)) c++;
01803       req->identifier = c;
01804       while(*c && (*c > 32)) c++;
01805       if (*c) {
01806          *c = '\0';
01807          c++;
01808          while(*c && (*c < 33)) c++;
01809          req->endpoint = c;
01810          while(*c && (*c > 32)) c++;
01811          if (*c) {
01812             *c = '\0';
01813             c++;
01814             while(*c && (*c < 33)) c++;
01815             req->version = c;
01816             while(*c && (*c > 32)) c++;
01817             while(*c && (*c < 33)) c++;
01818             while(*c && (*c > 32)) c++;
01819             *c = '\0';
01820          }
01821       }
01822    }
01823       
01824    if (mgcpdebug) {
01825       ast_verbose("Verb: '%s', Identifier: '%s', Endpoint: '%s', Version: '%s'\n",
01826          req->verb, req->identifier, req->endpoint, req->version);
01827       ast_verbose("%d headers, %d lines\n", req->headers, req->lines);
01828    }
01829    if (*c) 
01830       ast_log(LOG_WARNING, "Odd content, extra stuff left over ('%s')\n", c);
01831 }
01832 
01833 static int process_sdp(struct mgcp_subchannel *sub, struct mgcp_request *req)
01834 {
01835    char *m;
01836    char *c;
01837    char *a;
01838    char host[258];
01839    int len;
01840    int portno;
01841    int peercapability, peerNonCodecCapability;
01842    struct sockaddr_in sin;
01843    char *codecs;
01844    struct ast_hostent ahp; struct hostent *hp;
01845    int codec, codec_count=0;
01846    int iterator;
01847    struct mgcp_endpoint *p = sub->parent;
01848 
01849    /* Get codec and RTP info from SDP */
01850    m = get_sdp(req, "m");
01851    c = get_sdp(req, "c");
01852    if (ast_strlen_zero(m) || ast_strlen_zero(c)) {
01853       ast_log(LOG_WARNING, "Insufficient information for SDP (m = '%s', c = '%s')\n", m, c);
01854       return -1;
01855    }
01856    if (sscanf(c, "IN IP4 %256s", host) != 1) {
01857       ast_log(LOG_WARNING, "Invalid host in c= line, '%s'\n", c);
01858       return -1;
01859    }
01860    /* XXX This could block for a long time, and block the main thread! XXX */
01861    hp = ast_gethostbyname(host, &ahp);
01862    if (!hp) {
01863       ast_log(LOG_WARNING, "Unable to lookup host in c= line, '%s'\n", c);
01864       return -1;
01865    }
01866    if (sscanf(m, "audio %d RTP/AVP %n", &portno, &len) != 1) {
01867       ast_log(LOG_WARNING, "Unable to determine port number for RTP in '%s'\n", m); 
01868       return -1;
01869    }
01870    sin.sin_family = AF_INET;
01871    memcpy(&sin.sin_addr, hp->h_addr, sizeof(sin.sin_addr));
01872    sin.sin_port = htons(portno);
01873    ast_rtp_set_peer(sub->rtp, &sin);
01874 #if 0
01875    printf("Peer RTP is at port %s:%d\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
01876 #endif   
01877    /* Scan through the RTP payload types specified in a "m=" line: */
01878    ast_rtp_pt_clear(sub->rtp);
01879    codecs = ast_strdupa(m + len);
01880    while (!ast_strlen_zero(codecs)) {
01881       if (sscanf(codecs, "%d%n", &codec, &len) != 1) {
01882          if (codec_count)
01883             break;
01884          ast_log(LOG_WARNING, "Error in codec string '%s' at '%s'\n", m, codecs);
01885          return -1;
01886       }
01887       ast_rtp_set_m_type(sub->rtp, codec);
01888       codec_count++;
01889       codecs += len;
01890    }
01891 
01892    /* Next, scan through each "a=rtpmap:" line, noting each */
01893    /* specified RTP payload type (with corresponding MIME subtype): */
01894    sdpLineNum_iterator_init(&iterator);
01895    while ((a = get_sdp_iterate(&iterator, req, "a"))[0] != '\0') {
01896       char* mimeSubtype = ast_strdupa(a); /* ensures we have enough space */
01897       if (sscanf(a, "rtpmap: %u %[^/]/", &codec, mimeSubtype) != 2)
01898          continue;
01899       /* Note: should really look at the 'freq' and '#chans' params too */
01900       ast_rtp_set_rtpmap_type(sub->rtp, codec, "audio", mimeSubtype, 0);
01901    }
01902 
01903    /* Now gather all of the codecs that were asked for: */
01904    ast_rtp_get_current_formats(sub->rtp, &peercapability, &peerNonCodecCapability);
01905    p->capability = capability & peercapability;
01906    if (mgcpdebug) {
01907       ast_verbose("Capabilities: us - %d, them - %d, combined - %d\n",
01908          capability, peercapability, p->capability);
01909       ast_verbose("Non-codec capabilities: us - %d, them - %d, combined - %d\n",
01910          nonCodecCapability, peerNonCodecCapability, p->nonCodecCapability);
01911    }
01912    if (!p->capability) {
01913       ast_log(LOG_WARNING, "No compatible codecs!\n");
01914       return -1;
01915    }
01916    return 0;
01917 }
01918 
01919 static int add_header(struct mgcp_request *req, char *var, char *value)
01920 {
01921    if (req->len >= sizeof(req->data) - 4) {
01922       ast_log(LOG_WARNING, "Out of space, can't add anymore\n");
01923       return -1;
01924    }
01925    if (req->lines) {
01926       ast_log(LOG_WARNING, "Can't add more headers when lines have been added\n");
01927       return -1;
01928    }
01929    req->header[req->headers] = req->data + req->len;
01930    snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s: %s\r\n", var, value);
01931    req->len += strlen(req->header[req->headers]);
01932    if (req->headers < MGCP_MAX_HEADERS)
01933       req->headers++;
01934    else {
01935       ast_log(LOG_WARNING, "Out of header space\n");
01936       return -1;
01937    }
01938    return 0;   
01939 }
01940 
01941 static int add_line(struct mgcp_request *req, char *line)
01942 {
01943    if (req->len >= sizeof(req->data) - 4) {
01944       ast_log(LOG_WARNING, "Out of space, can't add anymore\n");
01945       return -1;
01946    }
01947    if (!req->lines) {
01948       /* Add extra empty return */
01949       snprintf(req->data + req->len, sizeof(req->data) - req->len, "\r\n");
01950       req->len += strlen(req->data + req->len);
01951    }
01952    req->line[req->lines] = req->data + req->len;
01953    snprintf(req->line[req->lines], sizeof(req->data) - req->len, "%s", line);
01954    req->len += strlen(req->line[req->lines]);
01955    if (req->lines < MGCP_MAX_LINES)
01956       req->lines++;
01957    else {
01958       ast_log(LOG_WARNING, "Out of line space\n");
01959       return -1;
01960    }
01961    return 0;   
01962 }
01963 
01964 static int init_resp(struct mgcp_request *req, char *resp, struct mgcp_request *orig, char *resprest)
01965 {
01966    /* Initialize a response */
01967    if (req->headers || req->len) {
01968       ast_log(LOG_WARNING, "Request already initialized?!?\n");
01969       return -1;
01970    }
01971    req->header[req->headers] = req->data + req->len;
01972    snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %s %s\r\n", resp, orig->identifier, resprest);
01973    req->len += strlen(req->header[req->headers]);
01974    if (req->headers < MGCP_MAX_HEADERS)
01975       req->headers++;
01976    else
01977       ast_log(LOG_WARNING, "Out of header space\n");
01978    return 0;
01979 }
01980 
01981 static int init_req(struct mgcp_endpoint *p, struct mgcp_request *req, char *verb)
01982 {
01983    /* Initialize a response */
01984    if (req->headers || req->len) {
01985       ast_log(LOG_WARNING, "Request already initialized?!?\n");
01986       return -1;
01987    }
01988    req->header[req->headers] = req->data + req->len;
01989    /* check if we need brackets around the gw name */
01990    if (p->parent->isnamedottedip)
01991       snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %d %s@[%s] MGCP 1.0\r\n", verb, oseq, p->name, p->parent->name);
01992    else
01993       snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %d %s@%s MGCP 1.0\r\n", verb, oseq, p->name, p->parent->name);
01994    req->len += strlen(req->header[req->headers]);
01995    if (req->headers < MGCP_MAX_HEADERS)
01996       req->headers++;
01997    else
01998       ast_log(LOG_WARNING, "Out of header space\n");
01999    return 0;
02000 }
02001 
02002 
02003 static int respprep(struct mgcp_request *resp, struct mgcp_endpoint *p, char *msg, struct mgcp_request *req, char *msgrest)
02004 {
02005    memset(resp, 0, sizeof(*resp));
02006    init_resp(resp, msg, req, msgrest);
02007    return 0;
02008 }
02009 
02010 static int reqprep(struct mgcp_request *req, struct mgcp_endpoint *p, char *verb)
02011 {
02012    memset(req, 0, sizeof(struct mgcp_request));
02013    oseq++;
02014    if (oseq > 999999999)
02015       oseq = 1;
02016    init_req(p, req, verb);
02017    return 0;
02018 }
02019 
02020 static int transmit_response(struct mgcp_subchannel *sub, char *msg, struct mgcp_request *req, char *msgrest)
02021 {
02022    struct mgcp_request resp;
02023    struct mgcp_endpoint *p = sub->parent;
02024    struct mgcp_response *mgr;
02025 
02026    respprep(&resp, p, msg, req, msgrest);
02027    mgr = malloc(sizeof(struct mgcp_response) + resp.len + 1);
02028    if (mgr) {
02029       /* Store MGCP response in case we have to retransmit */
02030       memset(mgr, 0, sizeof(struct mgcp_response));
02031       sscanf(req->identifier, "%d", &mgr->seqno);
02032       time(&mgr->whensent);
02033       mgr->len = resp.len;
02034       memcpy(mgr->buf, resp.data, resp.len);
02035       mgr->buf[resp.len] = '\0';
02036       mgr->next = p->parent->responses;
02037       p->parent->responses = mgr;
02038    }
02039    return send_response(sub, &resp);
02040 }
02041 
02042 
02043 static int add_sdp(struct mgcp_request *resp, struct mgcp_subchannel *sub, struct ast_rtp *rtp)
02044 {
02045    int len;
02046    int codec;
02047    char costr[80];
02048    struct sockaddr_in sin;
02049    char v[256];
02050    char s[256];
02051    char o[256];
02052    char c[256];
02053    char t[256];
02054    char m[256] = "";
02055    char a[1024] = "";
02056    int x;
02057    struct sockaddr_in dest;
02058    struct mgcp_endpoint *p = sub->parent;
02059    /* XXX We break with the "recommendation" and send our IP, in order that our
02060           peer doesn't have to ast_gethostbyname() us XXX */
02061    len = 0;
02062    if (!sub->rtp) {
02063       ast_log(LOG_WARNING, "No way to add SDP without an RTP structure\n");
02064       return -1;
02065    }
02066    ast_rtp_get_us(sub->rtp, &sin);
02067    if (rtp) {
02068       ast_rtp_get_peer(rtp, &dest);
02069    } else {
02070       if (sub->tmpdest.sin_addr.s_addr) {
02071          dest.sin_addr = sub->tmpdest.sin_addr;
02072          dest.sin_port = sub->tmpdest.sin_port;
02073          /* Reset temporary destination */
02074          memset(&sub->tmpdest, 0, sizeof(sub->tmpdest));
02075       } else {
02076          dest.sin_addr = p->parent->ourip;
02077          dest.sin_port = sin.sin_port;
02078       }
02079    }
02080    if (mgcpdebug) {
02081       ast_verbose("We're at %s port %d\n", ast_inet_ntoa(p->parent->ourip), ntohs(sin.sin_port));
02082    }
02083    snprintf(v, sizeof(v), "v=0\r\n");
02084    snprintf(o, sizeof(o), "o=root %d %d IN IP4 %s\r\n", (int)getpid(), (int)getpid(), ast_inet_ntoa(dest.sin_addr));
02085    snprintf(s, sizeof(s), "s=session\r\n");
02086    snprintf(c, sizeof(c), "c=IN IP4 %s\r\n", ast_inet_ntoa(dest.sin_addr));
02087    snprintf(t, sizeof(t), "t=0 0\r\n");
02088    snprintf(m, sizeof(m), "m=audio %d RTP/AVP", ntohs(dest.sin_port));
02089    for (x = 1; x <= AST_FORMAT_MAX_AUDIO; x <<= 1) {
02090       if (p->capability & x) {
02091          if (mgcpdebug) {
02092             ast_verbose("Answering with capability %d\n", x);
02093          }
02094          codec = ast_rtp_lookup_code(sub->rtp, 1, x);
02095          if (codec > -1) {
02096             snprintf(costr, sizeof(costr), " %d", codec);
02097             strncat(m, costr, sizeof(m) - strlen(m) - 1);
02098             snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype(1, x, 0));
02099             strncat(a, costr, sizeof(a) - strlen(a) - 1);
02100          }
02101       }
02102    }
02103    for (x = 1; x <= AST_RTP_MAX; x <<= 1) {
02104       if (p->nonCodecCapability & x) {
02105          if (mgcpdebug) {
02106             ast_verbose("Answering with non-codec capability %d\n", x);
02107          }
02108          codec = ast_rtp_lookup_code(sub->rtp, 0, x);
02109          if (codec > -1) {
02110             snprintf(costr, sizeof(costr), " %d", codec);
02111             strncat(m, costr, sizeof(m) - strlen(m) - 1);
02112             snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype(0, x, 0));
02113             strncat(a, costr, sizeof(a) - strlen(a) - 1);
02114             if (x == AST_RTP_DTMF) {
02115                /* Indicate we support DTMF...  Not sure about 16,
02116                   but MSN supports it so dang it, we will too... */
02117                snprintf(costr, sizeof costr, "a=fmtp:%d 0-16\r\n", codec);
02118                strncat(a, costr, sizeof(a) - strlen(a) - 1);
02119             }
02120          }
02121       }
02122    }
02123    strncat(m, "\r\n", sizeof(m) - strlen(m) - 1);
02124    len = strlen(v) + strlen(s) + strlen(o) + strlen(c) + strlen(t) + strlen(m) + strlen(a);
02125    snprintf(costr, sizeof(costr), "%d", len);
02126    add_line(resp, v);
02127    add_line(resp, o);
02128    add_line(resp, s);
02129    add_line(resp, c);
02130    add_line(resp, t);
02131    add_line(resp, m);
02132    add_line(resp, a);
02133    return 0;
02134 }
02135 
02136 static int transmit_modify_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp *rtp, int codecs)
02137 {
02138    struct mgcp_request resp;
02139    char local[256];
02140    char tmp[80];
02141    int x;
02142    int capability;
02143    struct mgcp_endpoint *p = sub->parent;
02144 
02145    capability = p->capability;
02146    if (codecs)
02147       capability = codecs;
02148    if (ast_strlen_zero(sub->cxident) && rtp) {
02149       /* We don't have a CXident yet, store the destination and
02150          wait a bit */
02151       ast_rtp_get_peer(rtp, &sub->tmpdest);
02152       return 0;
02153    }
02154    snprintf(local, sizeof(local), "p:20");
02155    for (x=1;x<= AST_FORMAT_MAX_AUDIO; x <<= 1) {
02156       if (p->capability & x) {
02157          snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype(1, x, 0));
02158          strncat(local, tmp, sizeof(local) - strlen(local) - 1);
02159       }
02160    }
02161    reqprep(&resp, p, "MDCX");
02162    add_header(&resp, "C", sub->callid);
02163    add_header(&resp, "L", local);
02164    add_header(&resp, "M", mgcp_cxmodes[sub->cxmode]);
02165    /* X header should not be sent. kept for compatibility */
02166    add_header(&resp, "X", sub->txident);
02167    add_header(&resp, "I", sub->cxident);
02168    /*add_header(&resp, "S", "");*/
02169    add_sdp(&resp, sub, rtp);
02170    /* fill in new fields */
02171    resp.cmd = MGCP_CMD_MDCX;
02172    resp.trid = oseq;
02173    return send_request(p, sub, &resp, oseq); /* SC */
02174 }
02175 
02176 static int transmit_connect_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp *rtp)
02177 {
02178    struct mgcp_request resp;
02179    char local[256];
02180    char tmp[80];
02181    int x;
02182    struct mgcp_endpoint *p = sub->parent;
02183 
02184    snprintf(local, sizeof(local), "p:20");
02185    for (x=1;x<= AST_FORMAT_MAX_AUDIO; x <<= 1) {
02186       if (p->capability & x) {
02187          snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype(1, x, 0));
02188          strncat(local, tmp, sizeof(local) - strlen(local) - 1);
02189       }
02190    }
02191    if (mgcpdebug) {
02192       ast_verbose(VERBOSE_PREFIX_3 "Creating connection for %s@%s-%d in cxmode: %s callid: %s\n", 
02193          p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
02194    }
02195    reqprep(&resp, p, "CRCX");
02196    add_header(&resp, "C", sub->callid);
02197    add_header(&resp, "L", local);
02198    add_header(&resp, "M", mgcp_cxmodes[sub->cxmode]);
02199    /* X header should not be sent. kept for compatibility */
02200    add_header(&resp, "X", sub->txident);
02201    /*add_header(&resp, "S", "");*/
02202    add_sdp(&resp, sub, rtp);
02203    /* fill in new fields */
02204    resp.cmd = MGCP_CMD_CRCX;
02205    resp.trid = oseq;
02206    return send_request(p, sub, &resp, oseq);  /* SC */
02207 }
02208 
02209 static int transmit_notify_request(struct mgcp_subchannel *sub, char *tone)
02210 {
02211    struct mgcp_request resp;
02212    struct mgcp_endpoint *p = sub->parent;
02213 
02214    if (mgcpdebug) {
02215       ast_verbose(VERBOSE_PREFIX_3 "MGCP Asked to indicate tone: %s on  %s@%s-%d in cxmode: %s\n", 
02216          tone, p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode]);
02217    }
02218    ast_copy_string(p->curtone, tone, sizeof(p->curtone));
02219    reqprep(&resp, p, "RQNT");
02220    add_header(&resp, "X", p->rqnt_ident); /* SC */
02221    switch (p->hookstate) {
02222    case MGCP_ONHOOK:
02223       add_header(&resp, "R", "L/hd(N)");
02224       break;
02225    case MGCP_OFFHOOK:
02226       add_header_offhook(sub, &resp);
02227       break;
02228    }
02229    if (!ast_strlen_zero(tone)) {
02230       add_header(&resp, "S", tone);
02231    }
02232    /* fill in new fields */
02233    resp.cmd = MGCP_CMD_RQNT;
02234    resp.trid = oseq;
02235    return send_request(p, NULL, &resp, oseq); /* SC */
02236 }
02237 
02238 static int transmit_notify_request_with_callerid(struct mgcp_subchannel *sub, char *tone, char *callernum, char *callername)
02239 {
02240    struct mgcp_request resp;
02241    char tone2[256];
02242    char *l, *n;
02243    time_t t;
02244    struct tm tm;
02245    struct mgcp_endpoint *p = sub->parent;
02246    
02247    time(&t);
02248    ast_localtime(&t, &tm, NULL);
02249    n = callername;
02250    l = callernum;
02251    if (!n)
02252       n = "";
02253    if (!l)
02254       l = "";
02255 
02256    /* Keep track of last callerid for blacklist and callreturn */
02257    ast_copy_string(p->lastcallerid, l, sizeof(p->lastcallerid));
02258 
02259    snprintf(tone2, sizeof(tone2), "%s,L/ci(%02d/%02d/%02d/%02d,%s,%s)", tone, 
02260       tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, l, n);
02261    ast_copy_string(p->curtone, tone, sizeof(p->curtone));
02262    reqprep(&resp, p, "RQNT");
02263    add_header(&resp, "X", p->rqnt_ident); /* SC */
02264    switch (p->hookstate) {
02265    case MGCP_ONHOOK:
02266       add_header(&resp, "R", "L/hd(N)");
02267       break;
02268    case MGCP_OFFHOOK:
02269       add_header_offhook(sub, &resp);
02270       break;
02271    }
02272    if (!ast_strlen_zero(tone2)) {
02273       add_header(&resp, "S", tone2);
02274    }
02275    if (mgcpdebug) {
02276       ast_verbose(VERBOSE_PREFIX_3 "MGCP Asked to indicate tone: %s on  %s@%s-%d in cxmode: %s\n", 
02277          tone2, p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode]);
02278    }
02279    /* fill in new fields */
02280    resp.cmd = MGCP_CMD_RQNT;
02281    resp.trid = oseq;
02282    return send_request(p, NULL, &resp, oseq);  /* SC */
02283 }
02284 
02285 static int transmit_modify_request(struct mgcp_subchannel *sub)
02286 {
02287    struct mgcp_request resp;
02288    struct mgcp_endpoint *p = sub->parent;
02289 
02290    if (ast_strlen_zero(sub->cxident)) {
02291       /* We don't have a CXident yet, store the destination and
02292          wait a bit */
02293       return 0;
02294    }
02295    if (mgcpdebug) {
02296       ast_verbose(VERBOSE_PREFIX_3 "Modified %s@%s-%d with new mode: %s on callid: %s\n", 
02297          p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
02298    }
02299    reqprep(&resp, p, "MDCX");
02300    add_header(&resp, "C", sub->callid);
02301    add_header(&resp, "M", mgcp_cxmodes[sub->cxmode]);
02302    /* X header should not be sent. kept for compatibility */
02303    add_header(&resp, "X", sub->txident);
02304    add_header(&resp, "I", sub->cxident);
02305    switch (sub->parent->hookstate) {
02306    case MGCP_ONHOOK:
02307       add_header(&resp, "R", "L/hd(N)");
02308       break;
02309    case MGCP_OFFHOOK:
02310       add_header_offhook(sub, &resp);
02311       break;
02312    }
02313    /* fill in new fields */
02314    resp.cmd = MGCP_CMD_MDCX;
02315    resp.trid = oseq;
02316    return send_request(p, sub, &resp, oseq); /* SC */
02317 }
02318 
02319 
02320 static void add_header_offhook(struct mgcp_subchannel *sub, struct mgcp_request *resp)
02321 {
02322    struct mgcp_endpoint *p = sub->parent;
02323 
02324    if (p && p->sub && p->sub->owner && p->sub->owner->_state >= AST_STATE_RINGING && (p->dtmfmode & (MGCP_DTMF_INBAND | MGCP_DTMF_HYBRID)))
02325       add_header(resp, "R", "L/hu(N),L/hf(N)");
02326    else
02327       add_header(resp, "R", "L/hu(N),L/hf(N),D/[0-9#*](N)");
02328 }
02329 
02330 static int transmit_audit_endpoint(struct mgcp_endpoint *p)
02331 {
02332    struct mgcp_request resp;
02333    reqprep(&resp, p, "AUEP");
02334    /* removed unknown param VS */
02335    /*add_header(&resp, "F", "A,R,D,S,X,N,I,T,O,ES,E,MD,M");*/
02336    add_header(&resp, "F", "A");
02337    /* fill in new fields */
02338    resp.cmd = MGCP_CMD_AUEP;
02339    resp.trid = oseq;
02340    return send_request(p, NULL, &resp, oseq);  /* SC */
02341 }
02342 
02343 static int transmit_connection_del(struct mgcp_subchannel *sub)
02344 {
02345    struct mgcp_endpoint *p = sub->parent;
02346    struct mgcp_request resp;
02347 
02348    if (mgcpdebug) {
02349       ast_verbose(VERBOSE_PREFIX_3 "Delete connection %s %s@%s-%d with new mode: %s on callid: %s\n", 
02350          sub->cxident, p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
02351    }
02352    reqprep(&resp, p, "DLCX");
02353    /* check if call id is avail */
02354    if (sub->callid[0])
02355       add_header(&resp, "C", sub->callid);
02356    /* X header should not be sent. kept for compatibility */
02357    add_header(&resp, "X", sub->txident);
02358    /* check if cxident is avail */
02359    if (sub->cxident[0])
02360       add_header(&resp, "I", sub->cxident);
02361    /* fill in new fields */
02362    resp.cmd = MGCP_CMD_DLCX;
02363    resp.trid = oseq;
02364    return send_request(p, sub, &resp, oseq);  /* SC */
02365 }
02366 
02367 static int transmit_connection_del_w_params(struct mgcp_endpoint *p, char *callid, char *cxident)
02368 {
02369    struct mgcp_request resp;
02370 
02371    if (mgcpdebug) {
02372       ast_verbose(VERBOSE_PREFIX_3 "Delete connection %s %s@%s on callid: %s\n", 
02373          cxident ? cxident : "", p->name, p->parent->name, callid ? callid : "");
02374    }
02375    reqprep(&resp, p, "DLCX");
02376    /* check if call id is avail */
02377    if (callid && *callid)
02378       add_header(&resp, "C", callid);
02379    /* check if cxident is avail */
02380    if (cxident && *cxident)
02381       add_header(&resp, "I", cxident);
02382    /* fill in new fields */
02383    resp.cmd = MGCP_CMD_DLCX;
02384    resp.trid = oseq;
02385    return send_request(p, p->sub, &resp, oseq);
02386 }
02387 
02388 /*! \brief  dump_cmd_queues: (SC:) cleanup pending commands */
02389 static void dump_cmd_queues(struct mgcp_endpoint *p, struct mgcp_subchannel *sub) 
02390 {
02391    struct mgcp_request *t, *q;
02392 
02393    if (p) {
02394       ast_mutex_lock(&p->rqnt_queue_lock);
02395       for (q = p->rqnt_queue; q; t = q->next, free(q), q=t);
02396       p->rqnt_queue = NULL;
02397       ast_mutex_unlock(&p->rqnt_queue_lock);
02398 
02399       ast_mutex_lock(&p->cmd_queue_lock);
02400       for (q = p->cmd_queue; q; t = q->next, free(q), q=t);
02401       p->cmd_queue = NULL;
02402       ast_mutex_unlock(&p->cmd_queue_lock);
02403 
02404       ast_mutex_lock(&p->sub->cx_queue_lock);
02405       for (q = p->sub->cx_queue; q; t = q->next, free(q), q=t);
02406       p->sub->cx_queue = NULL;
02407       ast_mutex_unlock(&p->sub->cx_queue_lock);
02408 
02409       ast_mutex_lock(&p->sub->next->cx_queue_lock);
02410       for (q = p->sub->next->cx_queue; q; t = q->next, free(q), q=t);
02411       p->sub->next->cx_queue = NULL;
02412       ast_mutex_unlock(&p->sub->next->cx_queue_lock);
02413    } else if (sub) {
02414       ast_mutex_lock(&sub->cx_queue_lock);
02415       for (q = sub->cx_queue; q; t = q->next, free(q), q=t);
02416       sub->cx_queue = NULL;
02417       ast_mutex_unlock(&sub->cx_queue_lock);
02418    }
02419 }
02420 
02421 
02422 /*! \brief  find_command: (SC:) remove command transaction from queue */
02423 static struct mgcp_request *find_command(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
02424                                          struct mgcp_request **queue, ast_mutex_t *l, int ident)
02425 {
02426    struct mgcp_request *prev, *req;
02427 
02428    ast_mutex_lock(l);
02429    for (prev = NULL, req = *queue; req; prev = req, req = req->next) {
02430       if (req->trid == ident) {
02431          /* remove from queue */
02432          if (!prev)
02433             *queue = req->next;
02434          else
02435             prev->next = req->next;
02436 
02437          /* send next pending command */
02438          if (*queue) {
02439             if (mgcpdebug) {
02440                ast_verbose("Posting Queued Request:\n%s to %s:%d\n", (*queue)->data, 
02441                   ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
02442             }
02443 
02444             mgcp_postrequest(p, sub, (*queue)->data, (*queue)->len, (*queue)->trid);
02445          }
02446          break;
02447       }
02448    }
02449    ast_mutex_unlock(l);
02450    return req;
02451 }
02452 
02453 /* modified for new transport mechanism */
02454 static void handle_response(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,  
02455                             int result, unsigned int ident, struct mgcp_request *resp)
02456 {
02457    char *c;
02458    struct mgcp_request *req;
02459    struct mgcp_gateway *gw = p->parent;
02460 
02461    if (result < 200) {
02462       /* provisional response */
02463       return;
02464    }
02465 
02466    if (p->slowsequence) 
02467       req = find_command(p, sub, &p->cmd_queue, &p->cmd_queue_lock, ident);
02468    else if (sub)
02469       req = find_command(p, sub, &sub->cx_queue, &sub->cx_queue_lock, ident);
02470    else if (!(req = find_command(p, sub, &p->rqnt_queue, &p->rqnt_queue_lock, ident)))
02471       req = find_command(p, sub, &p->cmd_queue, &p->cmd_queue_lock, ident);
02472 
02473    if (!req) {
02474       if (option_verbose > 2) {
02475          ast_verbose(VERBOSE_PREFIX_3 "No command found on [%s] for transaction %d. Ignoring...\n", 
02476             gw->name, ident);
02477       }
02478       return;
02479    }
02480 
02481    if (p && (result >= 400) && (result <= 599)) {
02482       switch (result) {
02483       case 401:
02484          p->hookstate = MGCP_OFFHOOK;
02485          break;
02486       case 402:
02487          p->hookstate = MGCP_ONHOOK;
02488          break;
02489       case 406:
02490          ast_log(LOG_NOTICE, "Transaction %d timed out\n", ident);
02491          break;
02492       case 407:
02493          ast_log(LOG_NOTICE, "Transaction %d aborted\n", ident);
02494          break;
02495       }
02496       if (sub) {
02497          if (sub->owner) {
02498             ast_log(LOG_NOTICE, "Terminating on result %d from %s@%s-%d\n", 
02499                result, p->name, p->parent->name, sub ? sub->id:-1);
02500             mgcp_queue_hangup(sub);
02501          }
02502       } else {
02503          if (p->sub->next->owner) {
02504             ast_log(LOG_NOTICE, "Terminating on result %d from %s@%s-%d\n", 
02505                result, p->name, p->parent->name, sub ? sub->id:-1);
02506             mgcp_queue_hangup(p->sub);
02507          }
02508 
02509          if (p->sub->owner) {
02510             ast_log(LOG_NOTICE, "Terminating on result %d from %s@%s-%d\n", 
02511                result, p->name, p->parent->name, sub ? sub->id:-1);
02512             mgcp_queue_hangup(p->sub);
02513          }
02514 
02515          dump_cmd_queues(p, NULL);
02516       }
02517    }
02518 
02519    if (resp) {
02520       if (req->cmd == MGCP_CMD_CRCX) {
02521          if ((c = get_header(resp, "I"))) {
02522             if (!ast_strlen_zero(c) && sub) {
02523                /* if we are hanging up do not process this conn. */
02524                if (sub->owner) {
02525                   if (!ast_strlen_zero(sub->cxident)) {
02526                      if (strcasecmp(c, sub->cxident)) {
02527                         ast_log(LOG_WARNING, "Subchannel already has a cxident. sub->cxident: %s requested %s\n", sub->cxident, c);
02528                      }
02529                   }
02530                   ast_copy_string(sub->cxident, c, sizeof(sub->cxident));
02531                   if (sub->tmpdest.sin_addr.s_addr) {
02532                      transmit_modify_with_sdp(sub, NULL, 0);
02533                   }
02534                } else {
02535                   /* XXX delete this one
02536                      callid and conn id may already be lost. 
02537                      so the following del conn may have a side effect of 
02538                      cleaning up the next subchannel */
02539                   transmit_connection_del(sub);
02540                }
02541             }
02542          }
02543       }
02544 
02545       if (req->cmd == MGCP_CMD_AUEP) {
02546          /* check stale connection ids */
02547          if ((c = get_header(resp, "I"))) {
02548             char *v, *n;
02549             int len;
02550             while ((v = get_csv(c, &len, &n))) {
02551                if (len) {
02552                   if (strncasecmp(v, p->sub->cxident, len) &&
02553                       strncasecmp(v, p->sub->next->cxident, len)) {
02554                      /* connection id not found. delete it */
02555                      char cxident[80] = "";
02556 
02557                      if (len > (sizeof(cxident) - 1))
02558                         len = sizeof(cxident) - 1;
02559                      ast_copy_string(cxident, v, len);
02560                      if (option_verbose > 2) {
02561                         ast_verbose(VERBOSE_PREFIX_3 "Non existing connection id %s on %s@%s \n", 
02562                                cxident, p->name, gw->name);
02563                      }
02564                      transmit_connection_del_w_params(p, NULL, cxident);
02565                   }
02566                }
02567                c = n;
02568             }
02569          }
02570 
02571          /* Try to determine the hookstate returned from an audit endpoint command */
02572          if ((c = get_header(resp, "ES"))) {
02573             if (!ast_strlen_zero(c)) {
02574                if (strstr(c, "hu")) {
02575                   if (p->hookstate != MGCP_ONHOOK) {
02576                      /* XXX cleanup if we think we are offhook XXX */
02577                      if ((p->sub->owner || p->sub->next->owner ) && 
02578                          p->hookstate == MGCP_OFFHOOK)
02579                         mgcp_queue_hangup(sub);
02580                      p->hookstate = MGCP_ONHOOK;
02581 
02582                      /* update the requested events according to the new hookstate */
02583                      transmit_notify_request(p->sub, "");
02584 
02585                      /* verbose level check */
02586                      if (option_verbose > 2) {
02587                         ast_verbose(VERBOSE_PREFIX_3 "Setting hookstate of %s@%s to ONHOOK\n", p->name, gw->name);
02588                      }
02589                   }
02590                } else if (strstr(c, "hd")) {
02591                   if (p->hookstate != MGCP_OFFHOOK) {
02592                      p->hookstate = MGCP_OFFHOOK;
02593 
02594                      /* update the requested events according to the new hookstate */
02595                      transmit_notify_request(p->sub, "");
02596 
02597                      /* verbose level check */
02598                      if (option_verbose > 2) {
02599                         ast_verbose(VERBOSE_PREFIX_3 "Setting hookstate of %s@%s to OFFHOOK\n", p->name, gw->name);
02600                      }
02601                   }
02602                }
02603             }
02604          }
02605       }
02606 
02607       if (resp && resp->lines) {
02608          /* do not process sdp if we are hanging up. this may be a late response */
02609          if (sub && sub->owner) {
02610             if (!sub->rtp)
02611                start_rtp(sub);
02612             if (sub->rtp)
02613                process_sdp(sub, resp);
02614          }
02615       }
02616    }
02617 
02618    free(req);
02619 }
02620 
02621 static void start_rtp(struct mgcp_subchannel *sub)
02622 {
02623    ast_mutex_lock(&sub->lock);
02624    /* check again to be on the safe side */
02625    if (sub->rtp) {
02626       ast_rtp_destroy(sub->rtp);
02627       sub->rtp = NULL;
02628    }
02629    /* Allocate the RTP now */
02630    sub->rtp = ast_rtp_new_with_bindaddr(sched, io, 1, 0, bindaddr.sin_addr);
02631    if (sub->rtp && sub->owner)
02632       sub->owner->fds[0] = ast_rtp_fd(sub->rtp);
02633    if (sub->rtp)
02634       ast_rtp_setnat(sub->rtp, sub->nat);
02635 #if 0
02636    ast_rtp_set_callback(p->rtp, rtpready);
02637    ast_rtp_set_data(p->rtp, p);
02638 #endif      
02639    /* Make a call*ID */
02640         snprintf(sub->callid, sizeof(sub->callid), "%08lx%s", ast_random(), sub->txident);
02641    /* Transmit the connection create */
02642    transmit_connect_with_sdp(sub, NULL);
02643    ast_mutex_unlock(&sub->lock);
02644 }
02645 
02646 static void *mgcp_ss(void *data)
02647 {
02648    struct ast_channel *chan = data;
02649    struct mgcp_subchannel *sub = chan->tech_pvt;
02650    struct mgcp_endpoint *p = sub->parent;
02651    /* char exten[AST_MAX_EXTENSION] = ""; */
02652    int len = 0;
02653    int timeout = firstdigittimeout;
02654    int res= 0;
02655    int getforward = 0;
02656    int loop_pause = 100;
02657 
02658    len = strlen(p->dtmf_buf);
02659 
02660    while(len < AST_MAX_EXTENSION-1) {
02661       res = 1;  /* Assume that we will get a digit */
02662       while (strlen(p->dtmf_buf) == len){
02663          ast_safe_sleep(chan, loop_pause);
02664          timeout -= loop_pause;
02665          if (timeout <= 0){
02666             res = 0;
02667             break;
02668          }
02669          res = 1;
02670       }
02671 
02672       timeout = 0;
02673       len = strlen(p->dtmf_buf);
02674 
02675       if (!ast_ignore_pattern(chan->context, p->dtmf_buf)) {
02676          /*res = tone_zone_play_tone(p->subs[index].zfd, -1);*/
02677          ast_indicate(chan, -1);
02678       } else {
02679          /* XXX Redundant?  We should already be playing dialtone */
02680          /*tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALTONE);*/
02681          transmit_notify_request(sub, "L/dl");
02682       }
02683       if (ast_exists_extension(chan, chan->context, p->dtmf_buf, 1, p->cid_num)) {
02684          if (!res || !ast_matchmore_extension(chan, chan->context, p->dtmf_buf, 1, p->cid_num)) {
02685             if (getforward) {
02686                /* Record this as the forwarding extension */
02687                ast_copy_string(p->call_forward, p->dtmf_buf, sizeof(p->call_forward)); 
02688                if (option_verbose > 2) {
02689                   ast_verbose(VERBOSE_PREFIX_3 "Setting call forward to '%s' on channel %s\n", 
02690                      p->call_forward, chan->name);
02691                }
02692                /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
02693                transmit_notify_request(sub, "L/sl");
02694                if (res)
02695                   break;
02696                usleep(500000);
02697                /*res = tone_zone_play_tone(p->subs[index].zfd, -1);*/
02698                ast_indicate(chan, -1);
02699                sleep(1);
02700                memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02701                /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALTONE);*/
02702                transmit_notify_request(sub, "L/dl");
02703                len = 0;
02704                getforward = 0;
02705             } else {
02706                /*res = tone_zone_play_tone(p->subs[index].zfd, -1);*/
02707                ast_indicate(chan, -1);
02708                ast_copy_string(chan->exten, p->dtmf_buf, sizeof(chan->exten));
02709                memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02710                ast_set_callerid(chan,
02711                   p->hidecallerid ? "" : p->cid_num,
02712                   p->hidecallerid ? "" : p->cid_name,
02713                   chan->cid.cid_ani ? NULL : p->cid_num);
02714                ast_setstate(chan, AST_STATE_RING);
02715                /*zt_enable_ec(p);*/
02716                if (p->dtmfmode & MGCP_DTMF_HYBRID) {
02717                   p->dtmfmode |= MGCP_DTMF_INBAND;
02718                   ast_indicate(chan, -1);
02719                }
02720                res = ast_pbx_run(chan);
02721                if (res) {
02722                   ast_log(LOG_WARNING, "PBX exited non-zero\n");
02723                   /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_CONGESTION);*/
02724                   /*transmit_notify_request(p, "nbz", 1);*/
02725                   transmit_notify_request(sub, "G/cg");
02726                }
02727                return NULL;
02728             }
02729          } else {
02730             /* It's a match, but they just typed a digit, and there is an ambiguous match,
02731                so just set the timeout to matchdigittimeout and wait some more */
02732             timeout = matchdigittimeout;
02733          }
02734       } else if (res == 0) {
02735          ast_log(LOG_DEBUG, "not enough digits (and no ambiguous match)...\n");
02736          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_CONGESTION);*/
02737          transmit_notify_request(sub, "G/cg");
02738          /*zt_wait_event(p->subs[index].zfd);*/
02739          ast_hangup(chan);
02740          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02741          return NULL;
02742       } else if (p->hascallwaiting && p->callwaiting && !strcmp(p->dtmf_buf, "*70")) {
02743          if (option_verbose > 2) {
02744             ast_verbose(VERBOSE_PREFIX_3 "Disabling call waiting on %s\n", chan->name);
02745          }
02746          /* Disable call waiting if enabled */
02747          p->callwaiting = 0;
02748          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
02749          transmit_notify_request(sub, "L/sl");
02750          len = 0;
02751          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02752          timeout = firstdigittimeout;
02753       } else if (!strcmp(p->dtmf_buf,ast_pickup_ext())) {
02754          /* Scan all channels and see if any there
02755           * ringing channqels with that have call groups
02756           * that equal this channels pickup group  
02757           */
02758          if (ast_pickup_call(chan)) {
02759             ast_log(LOG_WARNING, "No call pickup possible...\n");
02760             /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_CONGESTION);*/
02761             transmit_notify_request(sub, "G/cg");
02762          }
02763          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02764          ast_hangup(chan);
02765          return NULL;
02766       } else if (!p->hidecallerid && !strcmp(p->dtmf_buf, "*67")) {
02767          if (option_verbose > 2) {
02768             ast_verbose(VERBOSE_PREFIX_3 "Disabling Caller*ID on %s\n", chan->name);
02769          }
02770          /* Disable Caller*ID if enabled */
02771          p->hidecallerid = 1;
02772          ast_set_callerid(chan, "", "", NULL);
02773          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
02774          transmit_notify_request(sub, "L/sl");
02775          len = 0;
02776          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02777          timeout = firstdigittimeout;
02778       } else if (p->callreturn && !strcmp(p->dtmf_buf, "*69")) {
02779          res = 0;
02780          if (!ast_strlen_zero(p->lastcallerid)) {
02781             res = ast_say_digit_str(chan, p->lastcallerid, "", chan->language);
02782          }
02783          if (!res)
02784             /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
02785             transmit_notify_request(sub, "L/sl");
02786          break;
02787       } else if (!strcmp(p->dtmf_buf, "*78")) {
02788          /* Do not disturb */
02789          if (option_verbose > 2) {
02790             ast_verbose(VERBOSE_PREFIX_3 "Enabled DND on channel %s\n", chan->name);
02791          }
02792          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
02793          transmit_notify_request(sub, "L/sl");
02794          p->dnd = 1;
02795          getforward = 0;
02796          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02797          len = 0;
02798       } else if (!strcmp(p->dtmf_buf, "*79")) {
02799          /* Do not disturb */
02800          if (option_verbose > 2) {
02801             ast_verbose(VERBOSE_PREFIX_3 "Disabled DND on channel %s\n", chan->name);
02802          }
02803          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
02804          transmit_notify_request(sub, "L/sl");
02805          p->dnd = 0;
02806          getforward = 0;
02807          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02808          len = 0;
02809       } else if (p->cancallforward && !strcmp(p->dtmf_buf, "*72")) {
02810          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
02811          transmit_notify_request(sub, "L/sl");
02812          getforward = 1;
02813          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02814          len = 0;
02815       } else if (p->cancallforward && !strcmp(p->dtmf_buf, "*73")) {
02816          if (option_verbose > 2) {
02817             ast_verbose(VERBOSE_PREFIX_3 "Cancelling call forwarding on channel %s\n", chan->name);
02818          }
02819          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
02820          transmit_notify_request(sub, "L/sl");
02821          memset(p->call_forward, 0, sizeof(p->call_forward));
02822          getforward = 0;
02823          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02824          len = 0;
02825       } else if (!strcmp(p->dtmf_buf, ast_parking_ext()) && 
02826          sub->next->owner && ast_bridged_channel(sub->next->owner)) {
02827          /* This is a three way call, the main call being a real channel, 
02828             and we're parking the first call. */
02829          ast_masq_park_call(ast_bridged_channel(sub->next->owner), chan, 0, NULL);
02830          if (option_verbose > 2) {
02831             ast_verbose(VERBOSE_PREFIX_3 "Parking call to '%s'\n", chan->name);
02832          }
02833          break;
02834       } else if (!ast_strlen_zero(p->lastcallerid) && !strcmp(p->dtmf_buf, "*60")) {
02835          if (option_verbose > 2) {
02836             ast_verbose(VERBOSE_PREFIX_3 "Blacklisting number %s\n", p->lastcallerid);
02837          }
02838          res = ast_db_put("blacklist", p->lastcallerid, "1");
02839          if (!res) {
02840             /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
02841             transmit_notify_request(sub, "L/sl");
02842             memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02843             len = 0;
02844          }
02845       } else if (p->hidecallerid && !strcmp(p->dtmf_buf, "*82")) {
02846          if (option_verbose > 2) {
02847             ast_verbose(VERBOSE_PREFIX_3 "Enabling Caller*ID on %s\n", chan->name);
02848          }
02849          /* Enable Caller*ID if enabled */
02850          p->hidecallerid = 0;
02851          ast_set_callerid(chan, p->cid_num, p->cid_name, NULL);
02852          /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
02853          transmit_notify_request(sub, "L/sl");
02854          len = 0;
02855          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02856          timeout = firstdigittimeout;
02857       } else if (!ast_canmatch_extension(chan, chan->context, p->dtmf_buf, 1, chan->cid.cid_num) &&
02858             ((p->dtmf_buf[0] != '*') || (strlen(p->dtmf_buf) > 2))) {
02859          if (option_debug)
02860             ast_log(LOG_DEBUG, "Can't match %s from '%s' in context %s\n", p->dtmf_buf, chan->cid.cid_num ? chan->cid.cid_num : "<Unknown Caller>", chan->context);
02861          break;
02862       }
02863       if (!timeout)
02864          timeout = gendigittimeout;
02865       if (len && !ast_ignore_pattern(chan->context, p->dtmf_buf))
02866          /*tone_zone_play_tone(p->subs[index].zfd, -1);*/
02867          ast_indicate(chan, -1);
02868    }
02869 #if 0
02870    for (;;) {
02871       res = ast_waitfordigit(chan, to);
02872       if (!res) {
02873          ast_log(LOG_DEBUG, "Timeout...\n");
02874          break;
02875       }
02876       if (res < 0) {
02877          ast_log(LOG_DEBUG, "Got hangup...\n");
02878          ast_hangup(chan);
02879          break;
02880       }
02881       exten[pos++] = res;
02882       if (!ast_ignore_pattern(chan->context, exten))
02883          ast_indicate(chan, -1);
02884       if (ast_matchmore_extension(chan, chan->context, exten, 1, chan->callerid)) {
02885          if (ast_exists_extension(chan, chan->context, exten, 1, chan->callerid)) 
02886             to = 3000;
02887          else
02888             to = 8000;
02889       } else
02890          break;
02891    }
02892    if (ast_exists_extension(chan, chan->context, exten, 1, chan->callerid)) {
02893       ast_copy_string(chan->exten, exten, sizeof(chan->exten)1);
02894       if (!p->rtp) {
02895          start_rtp(p);
02896       }
02897       ast_setstate(chan, AST_STATE_RING);
02898       chan->rings = 1;
02899       if (ast_pbx_run(chan)) {
02900          ast_log(LOG_WARNING, "Unable to launch PBX on %s\n", chan->name);
02901       } else {
02902          memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02903          return NULL;
02904       }
02905    }
02906 #endif
02907    ast_hangup(chan);
02908    memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
02909    return NULL;
02910 }
02911 
02912 static int attempt_transfer(struct mgcp_endpoint *p)
02913 {
02914    /* *************************
02915     * I hope this works.
02916     * Copied out of chan_zap
02917     * Cross your fingers
02918     * *************************/
02919 
02920    /* In order to transfer, we need at least one of the channels to
02921       actually be in a call bridge.  We can't conference two applications
02922       together (but then, why would we want to?) */
02923    if (ast_bridged_channel(p->sub->owner)) {
02924       /* The three-way person we're about to transfer to could still be in MOH, so
02925          stop if now if appropriate */
02926       if (ast_bridged_channel(p->sub->next->owner))
02927          ast_queue_control(p->sub->next->owner, AST_CONTROL_UNHOLD);
02928       if (p->sub->owner->_state == AST_STATE_RINGING) {
02929          ast_indicate(ast_bridged_channel(p->sub->next->owner), AST_CONTROL_RINGING);
02930       }
02931       if (ast_channel_masquerade(p->sub->next->owner, ast_bridged_channel(p->sub->owner))) {
02932          ast_log(LOG_WARNING, "Unable to masquerade %s as %s\n",
02933             ast_bridged_channel(p->sub->owner)->name, p->sub->next->owner->name);
02934          return -1;
02935       }
02936       /* Orphan the channel */
02937       unalloc_sub(p->sub->next);
02938    } else if (ast_bridged_channel(p->sub->next->owner)) {
02939       if (p->sub->owner->_state == AST_STATE_RINGING) {
02940          ast_indicate(ast_bridged_channel(p->sub->next->owner), AST_CONTROL_RINGING);
02941       }
02942       ast_queue_control(p->sub->next->owner, AST_CONTROL_UNHOLD);
02943       if (ast_channel_masquerade(p->sub->owner, ast_bridged_channel(p->sub->next->owner))) {
02944          ast_log(LOG_WARNING, "Unable to masquerade %s as %s\n",
02945             ast_bridged_channel(p->sub->next->owner)->name, p->sub->owner->name);
02946          return -1;
02947       }
02948       /*swap_subs(p, SUB_THREEWAY, SUB_REAL);*/
02949       if (option_verbose > 2) {
02950          ast_verbose(VERBOSE_PREFIX_3 "Swapping %d for %d on %s@%s\n", p->sub->id, p->sub->next->id, p->name, p->parent->name);
02951       }
02952       p->sub = p->sub->next;
02953       unalloc_sub(p->sub->next);
02954       /* Tell the caller not to hangup */
02955       return 1;
02956    } else {
02957       ast_log(LOG_DEBUG, "Neither %s nor %s are in a bridge, nothing to transfer\n",
02958          p->sub->owner->name, p->sub->next->owner->name);
02959       p->sub->next->owner->_softhangup |= AST_SOFTHANGUP_DEV;
02960       if (p->sub->next->owner) {
02961          p->sub->next->alreadygone = 1;
02962          mgcp_queue_hangup(p->sub->next);
02963       }
02964    }
02965    return 0;
02966 }
02967 
02968 static void handle_hd_hf(struct mgcp_subchannel *sub, char *ev) 
02969 {
02970    struct mgcp_endpoint *p = sub->parent;
02971    struct ast_channel *c;
02972    pthread_t t;
02973    pthread_attr_t attr;
02974    pthread_attr_init(&attr);
02975    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);   
02976 
02977    /* Off hook / answer */
02978    if (sub->outgoing) {
02979       /* Answered */
02980       if (sub->owner) {
02981          if (ast_bridged_channel(sub->owner))
02982             ast_queue_control(sub->owner, AST_CONTROL_UNHOLD);
02983          sub->cxmode = MGCP_CX_SENDRECV;
02984          if (!sub->rtp) {
02985             start_rtp(sub);
02986          } else {
02987             transmit_modify_request(sub);
02988          }
02989          /*transmit_notify_request(sub, "aw");*/
02990          transmit_notify_request(sub, "");
02991          mgcp_queue_control(sub, AST_CONTROL_ANSWER);
02992       }
02993    } else {
02994       /* Start switch */
02995       /*sub->cxmode = MGCP_CX_SENDRECV;*/
02996       if (!sub->owner) {
02997          if (!sub->rtp) {
02998             start_rtp(sub);
02999          } else {
03000             transmit_modify_request(sub);
03001          }
03002          if (p->immediate) {
03003             /* The channel is immediately up. Start right away */
03004 #ifdef DLINK_BUGGY_FIRMWARE   
03005             transmit_notify_request(sub, "rt");
03006 #else
03007             transmit_notify_request(sub, "G/rt");
03008 #endif      
03009             c = mgcp_new(sub, AST_STATE_RING);
03010             if (!c) {
03011                ast_log(LOG_WARNING, "Unable to start PBX on channel %s@%s\n", p->name, p->parent->name);
03012                transmit_notify_request(sub, "G/cg");
03013                ast_hangup(c);
03014             }
03015          } else {
03016             if (has_voicemail(p)) {
03017                transmit_notify_request(sub, "L/sl");
03018             } else {
03019                transmit_notify_request(sub, "L/dl");
03020             }
03021             c = mgcp_new(sub, AST_STATE_DOWN);
03022             if (c) {
03023                if (ast_pthread_create(&t, &attr, mgcp_ss, c)) {
03024                   ast_log(LOG_WARNING, "Unable to create switch thread: %s\n", strerror(errno));
03025                   ast_hangup(c);
03026                }
03027             } else {
03028                ast_log(LOG_WARNING, "Unable to create channel for %s@%s\n", p->name, p->parent->name);
03029             }
03030          }
03031       } else {
03032          if (p->hookstate == MGCP_OFFHOOK) {
03033             ast_log(LOG_WARNING, "Off hook, but already have owner on %s@%s\n", p->name, p->parent->name);
03034          } else {
03035             ast_log(LOG_WARNING, "On hook, but already have owner on %s@%s\n", p->name, p->parent->name);
03036             ast_log(LOG_WARNING, "If we're onhook why are we here trying to handle a hd or hf?\n");
03037          }
03038          if (ast_bridged_channel(sub->owner))
03039             ast_queue_control(sub->owner, AST_CONTROL_UNHOLD);
03040          sub->cxmode = MGCP_CX_SENDRECV;
03041          if (!sub->rtp) {
03042             start_rtp(sub);
03043          } else {
03044             transmit_modify_request(sub);
03045          }
03046          /*transmit_notify_request(sub, "aw");*/
03047          transmit_notify_request(sub, "");
03048          /*ast_queue_control(sub->owner, AST_CONTROL_ANSWER);*/
03049       }
03050    }
03051    pthread_attr_destroy(&attr);
03052 }
03053 
03054 static int handle_request(struct mgcp_subchannel *sub, struct mgcp_request *req, struct sockaddr_in *sin)
03055 {
03056    char *ev, *s;
03057    struct ast_frame f = { 0, };
03058    struct mgcp_endpoint *p = sub->parent;
03059    struct mgcp_gateway *g = NULL;
03060    int res;
03061 
03062    if (mgcpdebug) {
03063       ast_verbose("Handling request '%s' on %s@%s\n", req->verb, p->name, p->parent->name);
03064    }
03065    /* Clear out potential response */
03066    if (!strcasecmp(req->verb, "RSIP")) {
03067       /* Test if this RSIP request is just a keepalive */
03068       if(!strcasecmp( get_header(req, "RM"), "X-keepalive")) {
03069          if (option_verbose > 2)
03070             ast_verbose(VERBOSE_PREFIX_3 "Received keepalive request from %s@%s\n", p->name, p->parent->name);
03071          transmit_response(sub, "200", req, "OK");
03072       } else {
03073          dump_queue(p->parent, p);
03074          dump_cmd_queues(p, NULL);
03075          
03076          if (option_verbose > 2 && (strcmp(p->name, p->parent->wcardep) != 0)) {
03077             ast_verbose(VERBOSE_PREFIX_3 "Resetting interface %s@%s\n", p->name, p->parent->name);
03078          }
03079          /* For RSIP on wildcard we reset all endpoints */
03080          if (!strcmp(p->name, p->parent->wcardep)) {
03081             /* Reset all endpoints */
03082             struct mgcp_endpoint *tmp_ep;
03083             
03084             g = p->parent;
03085             tmp_ep = g->endpoints;
03086             while (tmp_ep) {
03087                /*if ((strcmp(tmp_ep->name, "*") != 0) && (strcmp(tmp_ep->name, "aaln/" "*") != 0)) {*/
03088                if (strcmp(tmp_ep->name, g->wcardep) != 0) {
03089                   struct mgcp_subchannel *tmp_sub, *first_sub;
03090                   if (option_verbose > 2) {
03091                      ast_verbose(VERBOSE_PREFIX_3 "Resetting interface %s@%s\n", tmp_ep->name, p->parent->name);
03092                   }
03093                   
03094                   first_sub = tmp_ep->sub;
03095                   tmp_sub = tmp_ep->sub;
03096                   while (tmp_sub) {
03097                      mgcp_queue_hangup(tmp_sub);
03098                      tmp_sub = tmp_sub->next;
03099                      if (tmp_sub == first_sub)
03100                         break;
03101                   }
03102                }
03103                tmp_ep = tmp_ep->next;
03104             }
03105          } else if (sub->owner) {
03106             mgcp_queue_hangup(sub);
03107          }
03108          transmit_response(sub, "200", req, "OK");
03109          /* We dont send NTFY or AUEP to wildcard ep */
03110          if (strcmp(p->name, p->parent->wcardep) != 0) {
03111             transmit_notify_request(sub, "");
03112             /* Audit endpoint. 
03113              Idea is to prevent lost lines due to race conditions 
03114             */
03115             transmit_audit_endpoint(p);
03116          }
03117       }
03118    } else if (!strcasecmp(req->verb, "NTFY")) {
03119       /* Acknowledge and be sure we keep looking for the same things */
03120       transmit_response(sub, "200", req, "OK");
03121       /* Notified of an event */
03122       ev = get_header(req, "O");
03123       s = strchr(ev, '/');
03124       if (s) ev = s + 1;
03125       ast_log(LOG_DEBUG, "Endpoint '%s@%s-%d' observed '%s'\n", p->name, p->parent->name, sub->id, ev);
03126       /* Keep looking for events unless this was a hangup */
03127       if (strcasecmp(ev, "hu") && strcasecmp(ev, "hd") && strcasecmp(ev, "ping")) {
03128          transmit_notify_request(sub, p->curtone);
03129       }
03130       if (!strcasecmp(ev, "hd")) {
03131          p->hookstate = MGCP_OFFHOOK;
03132          sub->cxmode = MGCP_CX_SENDRECV;
03133          handle_hd_hf(sub, ev);
03134       } else if (!strcasecmp(ev, "hf")) {
03135          /* We can assume we are offhook if we received a hookflash */
03136          /* First let's just do call wait and ignore threeway */
03137          /* We're currently in charge */
03138          if (p->hookstate != MGCP_OFFHOOK) {
03139             /* Cisco c7940 sends hf even if the phone is onhook */
03140             /* Thanks to point on IRC for pointing this out */
03141             return -1;
03142          }
03143          /* do not let * conference two down channels */  
03144          if (sub->owner && sub->owner->_state == AST_STATE_DOWN && !sub->next->owner)
03145             return -1;
03146 
03147          if (p->callwaiting || p->transfer || p->threewaycalling) {
03148             if (option_verbose > 2) {
03149                ast_verbose(VERBOSE_PREFIX_3 "Swapping %d for %d on %s@%s\n", p->sub->id, p->sub->next->id, p->name, p->parent->name);
03150             }
03151             p->sub = p->sub->next;
03152 
03153             /* transfer control to our next subchannel */
03154             if (!sub->next->owner) {
03155                /* plave the first call on hold and start up a new call */
03156                sub->cxmode = MGCP_CX_MUTE;
03157                if (option_verbose > 2) {
03158                   ast_verbose(VERBOSE_PREFIX_3 "MGCP Muting %d on %s@%s\n", sub->id, p->name, p->parent->name);
03159                }
03160                transmit_modify_request(sub);
03161                if (sub->owner && ast_bridged_channel(sub->owner))
03162                   ast_queue_control(sub->owner, AST_CONTROL_HOLD);
03163                sub->next->cxmode = MGCP_CX_RECVONLY;
03164                handle_hd_hf(sub->next, ev);
03165             } else if (sub->owner && sub->next->owner) {
03166                /* We've got two active calls lets decide whether or not to conference or just flip flop */
03167                if ((!sub->outgoing) && (!sub->next->outgoing)) {
03168                   /* We made both calls lets conferenct */
03169                   if (option_verbose > 2) {
03170                      ast_verbose(VERBOSE_PREFIX_3 "MGCP Conferencing %d and %d on %s@%s\n", 
03171                         sub->id, sub->next->id, p->name, p->parent->name);
03172                   }
03173                   sub->cxmode = MGCP_CX_CONF;
03174                   sub->next->cxmode = MGCP_CX_CONF;
03175                   if (ast_bridged_channel(sub->next->owner))
03176                      ast_queue_control(sub->next->owner, AST_CONTROL_UNHOLD);
03177                   transmit_modify_request(sub);
03178                   transmit_modify_request(sub->next);
03179                } else {
03180                   /* Let's flipflop between calls */
03181                   /* XXX Need to check for state up ??? */
03182                   /* XXX Need a way to indicate the current call, or maybe the call that's waiting */
03183                   if (option_verbose > 2) {
03184                      ast_verbose(VERBOSE_PREFIX_3 "We didn't make one of the calls FLIPFLOP %d and %d on %s@%s\n", 
03185                         sub->id, sub->next->id, p->name, p->parent->name);
03186                   }
03187                   sub->cxmode = MGCP_CX_MUTE;
03188                   if (option_verbose > 2) {
03189                      ast_verbose(VERBOSE_PREFIX_3 "MGCP Muting %d on %s@%s\n", sub->id, p->name, p->parent->name);
03190                   }
03191                   transmit_modify_request(sub);
03192                   if (ast_bridged_channel(sub->owner))
03193                      ast_queue_control(sub->owner, AST_CONTROL_HOLD);
03194                         
03195                   if (ast_bridged_channel(sub->next->owner)) 
03196                      ast_queue_control(sub->next->owner, AST_CONTROL_HOLD);
03197                         
03198                   handle_hd_hf(sub->next, ev);
03199                }
03200             } else {
03201                /* We've most likely lost one of our calls find an active call and bring it up */
03202                if (sub->owner) {
03203                   p->sub = sub;
03204                } else if (sub->next->owner) {
03205                   p->sub = sub->next;
03206                } else {
03207                   /* We seem to have lost both our calls */
03208                   /* XXX - What do we do now? */
03209                   return -1;
03210                }
03211                if (ast_bridged_channel(p->sub->owner))
03212                   ast_queue_control(p->sub->owner, AST_CONTROL_UNHOLD);
03213                p->sub->cxmode = MGCP_CX_SENDRECV;
03214                transmit_modify_request(p->sub);
03215             }
03216          } else {
03217             ast_log(LOG_WARNING, "Callwaiting, call transfer or threeway calling not enabled on endpoint %s@%s\n", 
03218                p->name, p->parent->name);
03219          }
03220       } else if (!strcasecmp(ev, "hu")) {
03221          p->hookstate = MGCP_ONHOOK;
03222          sub->cxmode = MGCP_CX_RECVONLY;
03223          ast_log(LOG_DEBUG, "MGCP %s@%s Went on hook\n", p->name, p->parent->name);
03224          /* Do we need to send MDCX before a DLCX ?
03225          if (sub->rtp) {
03226             transmit_modify_request(sub);
03227          }
03228          */
03229          if (p->transfer && (sub->owner && sub->next->owner) && ((!sub->outgoing) || (!sub->next->outgoing))) {
03230             /* We're allowed to transfer, we have two avtive calls and */
03231             /* we made at least one of the calls.  Let's try and transfer */
03232             ast_mutex_lock(&p->sub->next->lock);
03233             res = attempt_transfer(p);
03234             if (res < 0) {
03235                if (p->sub->next->owner) {
03236                   sub->next->alreadygone = 1;
03237                   mgcp_queue_hangup(sub->next);
03238                }
03239             } else if (res) {
03240                ast_log(LOG_WARNING, "Transfer attempt failed\n");
03241                ast_mutex_unlock(&p->sub->next->lock);
03242                return -1;
03243             }
03244             ast_mutex_unlock(&p->sub->next->lock);
03245          } else {
03246             /* Hangup the current call */
03247             /* If there is another active call, mgcp_hangup will ring the phone with the other call */
03248             if (sub->owner) {
03249                sub->alreadygone = 1;
03250                mgcp_queue_hangup(sub);
03251             } else {
03252                /* verbose level check */
03253                if (option_verbose > 2) {
03254                   ast_verbose(VERBOSE_PREFIX_3 "MGCP handle_request(%s@%s-%d) ast_channel already destroyed, resending DLCX.\n",
03255                      p->name, p->parent->name, sub->id);
03256                }
03257                /* Instruct the other side to remove the connection since it apparently *
03258                 * still thinks the channel is active. *
03259                 * For Cisco IAD2421 /BAK/ */
03260                transmit_connection_del(sub);
03261             }
03262          }
03263          if ((p->hookstate == MGCP_ONHOOK) && (!sub->rtp) && (!sub->next->rtp)) {
03264             p->hidecallerid = 0;
03265             if (p->hascallwaiting && !p->callwaiting) {
03266                if (option_verbose > 2)
03267                   ast_verbose(VERBOSE_PREFIX_3 "Enabling call waiting on MGCP/%s@%s-%d\n", p->name, p->parent->name, sub->id);
03268                p->callwaiting = -1;
03269             }
03270             if (has_voicemail(p)) {
03271                if (option_verbose > 2) {
03272                   ast_verbose(VERBOSE_PREFIX_3 "MGCP handle_request(%s@%s) set vmwi(+)\n", p->name, p->parent->name);
03273                }
03274                transmit_notify_request(sub, "L/vmwi(+)");
03275             } else {
03276                if (option_verbose > 2) {
03277                   ast_verbose(VERBOSE_PREFIX_3 "MGCP handle_request(%s@%s) set vmwi(-)\n", p->name, p->parent->name);
03278                }
03279                transmit_notify_request(sub, "L/vmwi(-)");
03280             }
03281          }
03282       } else if ((strlen(ev) == 1) && 
03283             (((ev[0] >= '0') && (ev[0] <= '9')) ||
03284              ((ev[0] >= 'A') && (ev[0] <= 'D')) ||
03285               (ev[0] == '*') || (ev[0] == '#'))) {
03286          if (sub && sub->owner && (sub->owner->_state >=  AST_STATE_UP)) {
03287             f.frametype = AST_FRAME_DTMF;
03288             f.subclass = ev[0];
03289             f.src = "mgcp";
03290             /* XXX MUST queue this frame to all subs in threeway call if threeway call is active */
03291             mgcp_queue_frame(sub, &f);
03292             ast_mutex_lock(&sub->next->lock);
03293             if (sub->next->owner)
03294                mgcp_queue_frame(sub->next, &f);
03295             ast_mutex_unlock(&sub->next->lock);
03296             if (strstr(p->curtone, "wt") && (ev[0] == 'A')) {
03297                memset(p->curtone, 0, sizeof(p->curtone));
03298             }
03299          } else {
03300             p->dtmf_buf[strlen(p->dtmf_buf)] = ev[0];
03301             p->dtmf_buf[strlen(p->dtmf_buf)] = '\0';
03302          }
03303       } else if (!strcasecmp(ev, "T")) {
03304          /* Digit timeout -- unimportant */
03305       } else if (!strcasecmp(ev, "ping")) {
03306          /* ping -- unimportant */
03307       } else {
03308          ast_log(LOG_NOTICE, "Received unknown event '%s' from %s@%s\n", ev, p->name, p->parent->name);
03309       }
03310    } else {
03311       ast_log(LOG_WARNING, "Unknown verb '%s' received from %s\n", req->verb, ast_inet_ntoa(sin->sin_addr));
03312       transmit_response(sub, "510", req, "Unknown verb");
03313    }
03314    return 0;
03315 }
03316 
03317 static int find_and_retrans(struct mgcp_subchannel *sub, struct mgcp_request *req)
03318 {
03319    int seqno=0;
03320    time_t now;
03321    struct mgcp_response *prev = NULL, *cur, *next, *answer=NULL;
03322    time(&now);
03323    if (sscanf(req->identifier, "%d", &seqno) != 1) 
03324       seqno = 0;
03325    cur = sub->parent->parent->responses;
03326    while(cur) {
03327       next = cur->next;
03328       if (now - cur->whensent > RESPONSE_TIMEOUT) {
03329          /* Delete this entry */
03330          if (prev)
03331             prev->next = next;
03332          else
03333             sub->parent->parent->responses = next;
03334          free(cur);
03335       } else {
03336          if (seqno == cur->seqno)
03337             answer = cur;
03338          prev = cur;
03339       }
03340       cur = next;
03341    }
03342    if (answer) {
03343       resend_response(sub, answer);
03344       return 1;
03345    }
03346    return 0;
03347 }
03348 
03349 static int mgcpsock_read(int *id, int fd, short events, void *ignore)
03350 {
03351    struct mgcp_request req;
03352    struct sockaddr_in sin;
03353    struct mgcp_subchannel *sub;
03354    int res;
03355    socklen_t len;
03356    int result;
03357    int ident;
03358    len = sizeof(sin);
03359    memset(&req, 0, sizeof(req));
03360    res = recvfrom(mgcpsock, req.data, sizeof(req.data) - 1, 0, (struct sockaddr *)&sin, &len);
03361    if (res < 0) {
03362       if (errno != ECONNREFUSED)
03363          ast_log(LOG_WARNING, "Recv error: %s\n", strerror(errno));
03364       return 1;
03365    }
03366    req.data[res] = '\0';
03367    req.len = res;
03368    if (mgcpdebug) {
03369       ast_verbose("MGCP read: \n%s\nfrom %s:%d\n", req.data, ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
03370    }
03371    parse(&req);
03372    if (req.headers < 1) {
03373       /* Must have at least one header */
03374       return 1;
03375    }
03376    if (ast_strlen_zero(req.identifier)) {
03377       ast_log(LOG_NOTICE, "Message from %s missing identifier\n", ast_inet_ntoa(sin.sin_addr));
03378       return 1;
03379    }
03380 
03381    if (sscanf(req.verb, "%d", &result) && sscanf(req.identifier, "%d", &ident)) {
03382       /* Try to find who this message is for, if it's important */
03383       sub = find_subchannel_and_lock(NULL, ident, &sin);
03384       if (sub) {
03385          struct mgcp_gateway *gw = sub->parent->parent;
03386          struct mgcp_message *cur, *prev;
03387 
03388          ast_mutex_unlock(&sub->lock);
03389          ast_mutex_lock(&gw->msgs_lock);
03390          for (prev = NULL, cur = gw->msgs; cur; prev = cur, cur = cur->next) {
03391             if (cur->seqno == ident) {
03392                ast_log(LOG_DEBUG, "Got response back on transaction %d\n", ident);
03393                if (prev)
03394                   prev->next = cur->next;
03395                else
03396                   gw->msgs = cur->next;
03397                break;
03398             }
03399          }
03400 
03401          /* stop retrans timer if the queue is empty */
03402          if (!gw->msgs) {
03403             AST_SCHED_DEL(sched, gw->retransid);
03404          }
03405 
03406          ast_mutex_unlock(&gw->msgs_lock);
03407          if (cur) {
03408             handle_response(cur->owner_ep, cur->owner_sub, result, ident, &req);
03409             free(cur);
03410             return 1;
03411          }
03412 
03413          ast_log(LOG_NOTICE, "Got response back on [%s] for transaction %d we aren't sending?\n", 
03414             gw->name, ident);
03415       }
03416    } else {
03417       if (ast_strlen_zero(req.endpoint) || 
03418             ast_strlen_zero(req.version) || 
03419          ast_strlen_zero(req.verb)) {
03420          ast_log(LOG_NOTICE, "Message must have a verb, an idenitifier, version, and endpoint\n");
03421          return 1;
03422       }
03423       /* Process request, with iflock held */
03424       sub = find_subchannel_and_lock(req.endpoint, 0, &sin);
03425       if (sub) {
03426          /* look first to find a matching response in the queue */
03427          if (!find_and_retrans(sub, &req))
03428             /* pass the request off to the currently mastering subchannel */
03429             handle_request(sub, &req, &sin);
03430          ast_mutex_unlock(&sub->lock);
03431       }
03432    }
03433    return 1;
03434 }
03435 
03436 static int *mgcpsock_read_id = NULL;
03437 
03438 static void *do_monitor(void *data)
03439 {
03440    int res;
03441    int reloading;
03442    /*struct mgcp_gateway *g;*/
03443    /*struct mgcp_endpoint *e;*/
03444    /*time_t thispass = 0, lastpass = 0;*/
03445 
03446    /* Add an I/O event to our UDP socket */
03447    if (mgcpsock > -1) 
03448       mgcpsock_read_id = ast_io_add(io, mgcpsock, mgcpsock_read, AST_IO_IN, NULL);
03449    
03450    /* This thread monitors all the frame relay interfaces which are not yet in use
03451       (and thus do not have a separate thread) indefinitely */
03452    /* From here on out, we die whenever asked */
03453    for(;;) {
03454       /* Check for a reload request */
03455       ast_mutex_lock(&mgcp_reload_lock);
03456       reloading = mgcp_reloading;
03457       mgcp_reloading = 0;
03458       ast_mutex_unlock(&mgcp_reload_lock);
03459       if (reloading) {
03460          if (option_verbose > 0)
03461             ast_verbose(VERBOSE_PREFIX_1 "Reloading MGCP\n");
03462          mgcp_do_reload();
03463          /* Add an I/O event to our UDP socket */
03464          if (mgcpsock > -1) 
03465             mgcpsock_read_id = ast_io_add(io, mgcpsock, mgcpsock_read, AST_IO_IN, NULL);
03466       }
03467 
03468       /* Check for interfaces needing to be killed */
03469       /* Don't let anybody kill us right away.  Nobody should lock the interface list
03470          and wait for the monitor list, but the other way around is okay. */
03471       ast_mutex_lock(&monlock);
03472       /* Lock the network interface */
03473       ast_mutex_lock(&netlock);
03474 
03475 #if 0
03476       /* XXX THIS IS COMPLETELY HOSED */
03477       /* The gateway goes into a state of panic */
03478       /* If the vmwi indicator is sent while it is reseting interfaces */
03479       lastpass = thispass;
03480       thispass = time(NULL);
03481       g = gateways;
03482       while(g) {
03483          if (thispass != lastpass) {
03484             e = g->endpoints;
03485             while(e) {
03486                if (e->type == TYPE_LINE) {
03487                   res = has_voicemail(e);
03488                   if ((e->msgstate != res) && (e->hookstate == MGCP_ONHOOK) && (!e->rtp)){
03489                      if (res) {
03490                         transmit_notify_request(e, "L/vmwi(+)");
03491                      } else {
03492                         transmit_notify_request(e, "L/vmwi(-)");
03493                      }
03494                      e->msgstate = res;
03495                      e->onhooktime = thispass;
03496                   }
03497                }
03498                e = e->next;
03499             }
03500          }
03501          g = g->next;
03502       }
03503 #endif
03504       /* Okay, now that we know what to do, release the network lock */
03505       ast_mutex_unlock(&netlock);
03506       /* And from now on, we're okay to be killed, so release the monitor lock as well */
03507       ast_mutex_unlock(&monlock);
03508       pthread_testcancel();
03509       /* Wait for sched or io */
03510       res = ast_sched_wait(sched);
03511       /* copied from chan_sip.c */
03512       if ((res < 0) || (res > 1000))
03513          res = 1000;
03514       res = ast_io_wait(io, res);
03515       ast_mutex_lock(&monlock);
03516       if (res >= 0) 
03517          ast_sched_runq(sched);
03518       ast_mutex_unlock(&monlock);
03519    }
03520    /* Never reached */
03521    return NULL;
03522 }
03523 
03524 static int restart_monitor(void)
03525 {
03526    /* If we're supposed to be stopped -- stay stopped */
03527    if (monitor_thread == AST_PTHREADT_STOP)
03528       return 0;
03529    if (ast_mutex_lock(&monlock)) {
03530       ast_log(LOG_WARNING, "Unable to lock monitor\n");
03531       return -1;
03532    }
03533    if (monitor_thread == pthread_self()) {
03534       ast_mutex_unlock(&monlock);
03535       ast_log(LOG_WARNING, "Cannot kill myself\n");
03536       return -1;
03537    }
03538    if (monitor_thread != AST_PTHREADT_NULL) {
03539       /* Wake up the thread */
03540       pthread_kill(monitor_thread, SIGURG);
03541    } else {
03542       /* Start a new monitor */
03543       if (ast_pthread_create_background(&monitor_thread, NULL, do_monitor, NULL) < 0) {
03544          ast_mutex_unlock(&monlock);
03545          ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
03546          return -1;
03547       }
03548    }
03549    ast_mutex_unlock(&monlock);
03550    return 0;
03551 }
03552 
03553 static struct ast_channel *mgcp_request(const char *type, int format, void *data, int *cause)
03554 {
03555    int oldformat;
03556    struct mgcp_subchannel *sub;
03557    struct ast_channel *tmpc = NULL;
03558    char tmp[256];
03559    char *dest = data;
03560 
03561    oldformat = format;
03562    format &= capability;
03563    if (!format) {
03564       ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%d'\n", format);
03565       return NULL;
03566    }
03567    ast_copy_string(tmp, dest, sizeof(tmp));
03568    if (ast_strlen_zero(tmp)) {
03569       ast_log(LOG_NOTICE, "MGCP Channels require an endpoint\n");
03570       return NULL;
03571    }
03572    sub = find_subchannel_and_lock(tmp, 0, NULL);
03573    if (!sub) {
03574       ast_log(LOG_WARNING, "Unable to find MGCP endpoint '%s'\n", tmp);
03575       *cause = AST_CAUSE_UNREGISTERED;
03576       return NULL;
03577    }
03578    
03579    if (option_verbose > 2) {
03580       ast_verbose(VERBOSE_PREFIX_3 "MGCP mgcp_request(%s)\n", tmp);
03581       ast_verbose(VERBOSE_PREFIX_3 "MGCP cw: %d, dnd: %d, so: %d, sno: %d\n", 
03582          sub->parent->callwaiting, sub->parent->dnd, sub->owner ? 1 : 0, sub->next->owner ? 1: 0);
03583    }
03584    /* Must be busy */
03585    if (((sub->parent->callwaiting) && ((sub->owner) && (sub->next->owner))) ||
03586       ((!sub->parent->callwaiting) && (sub->owner)) ||
03587        (sub->parent->dnd && (ast_strlen_zero(sub->parent->call_forward)))) {
03588       if (sub->parent->hookstate == MGCP_ONHOOK) {
03589          if (has_voicemail(sub->parent)) {
03590             transmit_notify_request(sub,"L/vmwi(+)");
03591          } else {
03592             transmit_notify_request(sub,"L/vmwi(-)");
03593          }
03594       }
03595       *cause = AST_CAUSE_BUSY;
03596       ast_mutex_unlock(&sub->lock);
03597       return NULL;
03598    }
03599    tmpc = mgcp_new(sub->owner ? sub->next : sub, AST_STATE_DOWN);
03600    ast_mutex_unlock(&sub->lock);
03601    if (!tmpc)
03602       ast_log(LOG_WARNING, "Unable to make channel for '%s'\n", tmp);
03603    restart_monitor();
03604    return tmpc;
03605 }
03606 
03607 /* modified for reload support */
03608 /*! \brief  build_gateway: parse mgcp.conf and create gateway/endpoint structures */
03609 static struct mgcp_gateway *build_gateway(char *cat, struct ast_variable *v)
03610 {
03611    struct mgcp_gateway *gw;
03612    struct mgcp_endpoint *e;
03613    struct mgcp_subchannel *sub;
03614    /*char txident[80];*/
03615    int i=0, y=0;
03616    int gw_reload = 0;
03617    int ep_reload = 0;
03618    canreinvite = CANREINVITE;
03619 
03620    /* locate existing gateway */
03621    gw = gateways;
03622    while (gw) {
03623       if (!strcasecmp(cat, gw->name)) {
03624          /* gateway already exists */
03625          gw->delme = 0;
03626          gw_reload = 1;
03627          break;
03628       }
03629       gw = gw->next;
03630    }
03631 
03632    if (!gw)
03633       gw = malloc(sizeof(struct mgcp_gateway));
03634 
03635    if (gw) {
03636       if (!gw_reload) {
03637          memset(gw, 0, sizeof(struct mgcp_gateway));
03638          gw->expire = -1;
03639          gw->retransid = -1; /* SC */
03640          ast_mutex_init(&gw->msgs_lock);
03641          ast_copy_string(gw->name, cat, sizeof(gw->name));
03642          /* check if the name is numeric ip */
03643          if ((strchr(gw->name, '.')) && inet_addr(gw->name) != INADDR_NONE)
03644             gw->isnamedottedip = 1;
03645       }
03646       while(v) {
03647          if (!strcasecmp(v->name, "host")) {
03648             if (!strcasecmp(v->value, "dynamic")) {
03649                /* They'll register with us */
03650                gw->dynamic = 1;
03651                memset(&gw->addr.sin_addr, 0, 4);
03652                if (gw->addr.sin_port) {
03653                   /* If we've already got a port, make it the default rather than absolute */
03654                   gw->defaddr.sin_port = gw->addr.sin_port;
03655                   gw->addr.sin_port = 0;
03656                }
03657             } else {
03658                /* Non-dynamic.  Make sure we become that way if we're not */
03659                AST_SCHED_DEL(sched, gw->expire);
03660                gw->dynamic = 0;
03661                if (ast_get_ip(&gw->addr, v->value)) {
03662                   if (!gw_reload) {
03663                      ast_mutex_destroy(&gw->msgs_lock);
03664                      free(gw);
03665                   }
03666                   return NULL;
03667                }
03668             }
03669          } else if (!strcasecmp(v->name, "defaultip")) {
03670             if (ast_get_ip(&gw->defaddr, v->value)) {
03671                if (!gw_reload) {
03672                   ast_mutex_destroy(&gw->msgs_lock);
03673                   free(gw);
03674                }
03675                return NULL;
03676             }
03677          } else if (!strcasecmp(v->name, "permit") ||
03678             !strcasecmp(v->name, "deny")) {
03679             gw->ha = ast_append_ha(v->name, v->value, gw->ha);
03680          } else if (!strcasecmp(v->name, "port")) {
03681             gw->addr.sin_port = htons(atoi(v->value));
03682          } else if (!strcasecmp(v->name, "context")) {
03683             ast_copy_string(context, v->value, sizeof(context));
03684          } else if (!strcasecmp(v->name, "dtmfmode")) {
03685             if (!strcasecmp(v->value, "inband"))
03686                dtmfmode = MGCP_DTMF_INBAND;
03687             else if (!strcasecmp(v->value, "rfc2833")) 
03688                dtmfmode = MGCP_DTMF_RFC2833;
03689             else if (!strcasecmp(v->value, "hybrid"))
03690                dtmfmode = MGCP_DTMF_HYBRID;
03691             else if (!strcasecmp(v->value, "none")) 
03692                dtmfmode = 0;
03693             else
03694                ast_log(LOG_WARNING, "'%s' is not a valid DTMF mode at line %d\n", v->value, v->lineno);
03695          } else if (!strcasecmp(v->name, "nat")) {
03696             nat = ast_true(v->value);
03697          } else if (!strcasecmp(v->name, "callerid")) {
03698             if (!strcasecmp(v->value, "asreceived")) {
03699                cid_num[0] = '\0';
03700                cid_name[0] = '\0';
03701             } else {
03702                ast_callerid_split(v->value, cid_name, sizeof(cid_name), cid_num, sizeof(cid_num));
03703             }
03704          } else if (!strcasecmp(v->name, "language")) {
03705             ast_copy_string(language, v->value, sizeof(language));
03706          } else if (!strcasecmp(v->name, "accountcode")) {
03707             ast_copy_string(accountcode, v->value, sizeof(accountcode));
03708          } else if (!strcasecmp(v->name, "amaflags")) {
03709             y = ast_cdr_amaflags2int(v->value);
03710             if (y < 0) {
03711                ast_log(LOG_WARNING, "Invalid AMA flags: %s at line %d\n", v->value, v->lineno);
03712             } else {
03713                amaflags = y;
03714             }
03715          } else if (!strcasecmp(v->name, "musiconhold")) {
03716             ast_copy_string(musicclass, v->value, sizeof(musicclass));
03717          } else if (!strcasecmp(v->name, "callgroup")) {
03718             cur_callergroup = ast_get_group(v->value);
03719          } else if (!strcasecmp(v->name, "pickupgroup")) {
03720             cur_pickupgroup = ast_get_group(v->value);
03721          } else if (!strcasecmp(v->name, "immediate")) {
03722             immediate = ast_true(v->value);
03723          } else if (!strcasecmp(v->name, "cancallforward")) {
03724             cancallforward = ast_true(v->value);
03725          } else if (!strcasecmp(v->name, "singlepath")) {
03726             singlepath = ast_true(v->value);
03727          } else if (!strcasecmp(v->name, "canreinvite")) {
03728             canreinvite = ast_true(v->value);
03729          } else if (!strcasecmp(v->name, "mailbox")) {
03730             ast_copy_string(mailbox, v->value, sizeof(mailbox));
03731          } else if (!strcasecmp(v->name, "hasvoicemail")) {
03732             if (ast_true(v->value) && ast_strlen_zero(mailbox)) {
03733                ast_copy_string(mailbox, gw->name, sizeof(mailbox));
03734             }
03735          } else if (!strcasecmp(v->name, "adsi")) {
03736             adsi = ast_true(v->value);
03737          } else if (!strcasecmp(v->name, "callreturn")) {
03738             callreturn = ast_true(v->value);
03739          } else if (!strcasecmp(v->name, "callwaiting")) {
03740             callwaiting = ast_true(v->value);
03741          } else if (!strcasecmp(v->name, "slowsequence")) {
03742             slowsequence = ast_true(v->value);
03743          } else if (!strcasecmp(v->name, "transfer")) {
03744             transfer = ast_true(v->value);
03745          } else if (!strcasecmp(v->name, "threewaycalling")) {
03746             threewaycalling = ast_true(v->value);
03747          } else if (!strcasecmp(v->name, "wcardep")) {
03748             /* locate existing endpoint */
03749             e = gw->endpoints;
03750             while (e) {
03751                if (!strcasecmp(v->value, e->name)) {
03752                   /* endpoint already exists */
03753                   e->delme = 0;
03754                   ep_reload = 1;
03755                   break;
03756                }
03757                e = e->next;
03758             }
03759 
03760             if (!e) {
03761                /* Allocate wildcard endpoint */
03762                e = malloc(sizeof(struct mgcp_endpoint));
03763                ep_reload = 0;
03764             }
03765 
03766             if (e) {
03767                if (!ep_reload) {
03768                   memset(e, 0, sizeof(struct mgcp_endpoint));
03769                   ast_mutex_init(&e->lock);
03770                   ast_mutex_init(&e->rqnt_queue_lock);
03771                   ast_mutex_init(&e->cmd_queue_lock);
03772                   ast_copy_string(e->name, v->value, sizeof(e->name));
03773                   e->needaudit = 1;
03774                }
03775                ast_copy_string(gw->wcardep, v->value, sizeof(gw->wcardep));
03776                /* XXX Should we really check for uniqueness?? XXX */
03777                ast_copy_string(e->accountcode, accountcode, sizeof(e->accountcode));
03778                ast_copy_string(e->context, context, sizeof(e->context));
03779                ast_copy_string(e->cid_num, cid_num, sizeof(e->cid_num));
03780                ast_copy_string(e->cid_name, cid_name, sizeof(e->cid_name));
03781                ast_copy_string(e->language, language, sizeof(e->language));
03782                ast_copy_string(e->musicclass, musicclass, sizeof(e->musicclass));
03783                ast_copy_string(e->mailbox, mailbox, sizeof(e->mailbox));
03784                snprintf(e->rqnt_ident, sizeof(e->rqnt_ident), "%08lx", ast_random());
03785                e->msgstate = -1;
03786                e->amaflags = amaflags;
03787                e->capability = capability;
03788                e->parent = gw;
03789                e->dtmfmode = dtmfmode;
03790                if (!ep_reload && e->sub && e->sub->rtp)
03791                   e->dtmfmode |= MGCP_DTMF_INBAND;
03792                e->adsi = adsi;
03793                e->type = TYPE_LINE;
03794                e->immediate = immediate;
03795                e->callgroup=cur_callergroup;
03796                e->pickupgroup=cur_pickupgroup;
03797                e->callreturn = callreturn;
03798                e->cancallforward = cancallforward;
03799                e->singlepath = singlepath;
03800                e->canreinvite = canreinvite;
03801                e->callwaiting = callwaiting;
03802                e->hascallwaiting = callwaiting;
03803                e->slowsequence = slowsequence;
03804                e->transfer = transfer;
03805                e->threewaycalling = threewaycalling;
03806                e->onhooktime = time(NULL);
03807                /* ASSUME we're onhook */
03808                e->hookstate = MGCP_ONHOOK;
03809                if (!ep_reload) {
03810                   /*snprintf(txident, sizeof(txident), "%08lx", ast_random());*/
03811                   for (i = 0; i < MAX_SUBS; i++) {
03812                      sub = malloc(sizeof(struct mgcp_subchannel));
03813                      if (sub) {
03814                         ast_verbose(VERBOSE_PREFIX_3 "Allocating subchannel '%d' on %s@%s\n", i, e->name, gw->name);
03815                         memset(sub, 0, sizeof(struct mgcp_subchannel));
03816                         ast_mutex_init(&sub->lock);
03817                         ast_mutex_init(&sub->cx_queue_lock);
03818                         sub->parent = e;
03819                         sub->id = i;
03820                         snprintf(sub->txident, sizeof(sub->txident), "%08lx", ast_random());
03821                         /*stnrcpy(sub->txident, txident, sizeof(sub->txident) - 1);*/
03822                         sub->cxmode = MGCP_CX_INACTIVE;
03823                         sub->nat = nat;
03824                         sub->next = e->sub;
03825                         e->sub = sub;
03826                      } else {
03827                         /* XXX Should find a way to clean up our memory */
03828                         ast_log(LOG_WARNING, "Out of memory allocating subchannel\n");
03829                         return NULL;
03830                      }
03831                   }
03832                   /* Make out subs a circular linked list so we can always sping through the whole bunch */
03833                   sub = e->sub;
03834                   /* find the end of the list */
03835                   while(sub->next){
03836                      sub = sub->next;
03837                   }
03838                   /* set the last sub->next to the first sub */
03839                   sub->next = e->sub;
03840 
03841                   e->next = gw->endpoints;
03842                   gw->endpoints = e;
03843                }
03844             }
03845          } else if (!strcasecmp(v->name, "trunk") ||
03846                     !strcasecmp(v->name, "line")) {
03847 
03848             /* locate existing endpoint */
03849             e = gw->endpoints;
03850             while (e) {
03851                if (!strcasecmp(v->value, e->name)) {
03852                   /* endpoint already exists */
03853                   e->delme = 0;
03854                   ep_reload = 1;
03855                   break;
03856                }
03857                e = e->next;
03858             }
03859 
03860             if (!e) {
03861                e = malloc(sizeof(struct mgcp_endpoint));
03862                ep_reload = 0;
03863             }
03864 
03865             if (e) {
03866                if (!ep_reload) {
03867                   memset(e, 0, sizeof(struct mgcp_endpoint));
03868                   ast_mutex_init(&e->lock);
03869                   ast_mutex_init(&e->rqnt_queue_lock);
03870                   ast_mutex_init(&e->cmd_queue_lock);
03871                   ast_copy_string(e->name, v->value, sizeof(e->name));
03872                   e->needaudit = 1;
03873                }
03874                /* XXX Should we really check for uniqueness?? XXX */
03875                ast_copy_string(e->accountcode, accountcode, sizeof(e->accountcode));
03876                ast_copy_string(e->context, context, sizeof(e->context));
03877                ast_copy_string(e->cid_num, cid_num, sizeof(e->cid_num));
03878                ast_copy_string(e->cid_name, cid_name, sizeof(e->cid_name));
03879                ast_copy_string(e->language, language, sizeof(e->language));
03880                ast_copy_string(e->musicclass, musicclass, sizeof(e->musicclass));
03881                ast_copy_string(e->mailbox, mailbox, sizeof(e->mailbox));
03882                if (!ast_strlen_zero(mailbox)) {
03883                   ast_verbose(VERBOSE_PREFIX_3 "Setting mailbox '%s' on %s@%s\n", mailbox, gw->name, e->name);
03884                }
03885                if (!ep_reload) {
03886                   /* XXX potential issue due to reload */
03887                   e->msgstate = -1;
03888                   e->parent = gw;
03889                }
03890                e->amaflags = amaflags;
03891                e->capability = capability;
03892                e->dtmfmode = dtmfmode;
03893                e->adsi = adsi;
03894                if (!strcasecmp(v->name, "trunk"))
03895                   e->type = TYPE_TRUNK;
03896                else
03897                   e->type = TYPE_LINE;
03898 
03899                e->immediate = immediate;
03900                e->callgroup=cur_callergroup;
03901                e->pickupgroup=cur_pickupgroup;
03902                e->callreturn = callreturn;
03903                e->cancallforward = cancallforward;
03904                e->canreinvite = canreinvite;
03905                e->singlepath = singlepath;
03906                e->callwaiting = callwaiting;
03907                e->hascallwaiting = callwaiting;
03908                e->slowsequence = slowsequence;
03909                e->transfer = transfer;
03910                e->threewaycalling = threewaycalling;
03911                if (!ep_reload) {
03912                   e->onhooktime = time(NULL);
03913                   /* ASSUME we're onhook */
03914                   e->hookstate = MGCP_ONHOOK;
03915                   snprintf(e->rqnt_ident, sizeof(e->rqnt_ident), "%08lx", ast_random());
03916                }
03917 
03918                for (i = 0, sub = NULL; i < MAX_SUBS; i++) {
03919                   if (!ep_reload) {
03920                      sub = malloc(sizeof(struct mgcp_subchannel));
03921                   } else {
03922                      if (!sub)
03923                         sub = e->sub;
03924                      else
03925                         sub = sub->next;
03926                   }
03927 
03928                   if (sub) {
03929                      if (!ep_reload) {
03930                         ast_verbose(VERBOSE_PREFIX_3 "Allocating subchannel '%d' on %s@%s\n", i, e->name, gw->name);
03931                         memset(sub, 0, sizeof(struct mgcp_subchannel));
03932                         ast_mutex_init(&sub->lock);
03933                         ast_mutex_init(&sub->cx_queue_lock);
03934                         ast_copy_string(sub->magic, MGCP_SUBCHANNEL_MAGIC, sizeof(sub->magic));
03935                         sub->parent = e;
03936                         sub->id = i;
03937                         snprintf(sub->txident, sizeof(sub->txident), "%08lx", ast_random());
03938                         sub->cxmode = MGCP_CX_INACTIVE;
03939                         sub->next = e->sub;
03940                         e->sub = sub;
03941                      }
03942                      sub->nat = nat;
03943                   } else {
03944                      /* XXX Should find a way to clean up our memory */
03945                      ast_log(LOG_WARNING, "Out of memory allocating subchannel\n");
03946                      return NULL;
03947                   }
03948                }
03949                if (!ep_reload) {
03950                   /* Make out subs a circular linked list so we can always sping through the whole bunch */
03951                   sub = e->sub;
03952                   /* find the end of the list */
03953                   while (sub->next) {
03954                      sub = sub->next;
03955                   }
03956                   /* set the last sub->next to the first sub */
03957                   sub->next = e->sub;
03958 
03959                   e->next = gw->endpoints;
03960                   gw->endpoints = e;
03961                }
03962             }
03963          } else
03964             ast_log(LOG_WARNING, "Don't know keyword '%s' at line %d\n", v->name, v->lineno);
03965          v = v->next;
03966       }
03967    }
03968    if (!ntohl(gw->addr.sin_addr.s_addr) && !gw->dynamic) {
03969       ast_log(LOG_WARNING, "Gateway '%s' lacks IP address and isn't dynamic\n", gw->name);
03970       if (!gw_reload) {
03971          ast_mutex_destroy(&gw->msgs_lock);
03972          free(gw);
03973       }
03974       return NULL;
03975    }
03976    gw->defaddr.sin_family = AF_INET;
03977    gw->addr.sin_family = AF_INET;
03978    if (gw->defaddr.sin_addr.s_addr && !ntohs(gw->defaddr.sin_port)) 
03979       gw->defaddr.sin_port = htons(DEFAULT_MGCP_GW_PORT);
03980    if (gw->addr.sin_addr.s_addr && !ntohs(gw->addr.sin_port))
03981       gw->addr.sin_port = htons(DEFAULT_MGCP_GW_PORT);
03982    if (gw->addr.sin_addr.s_addr)
03983       if (ast_ouraddrfor(&gw->addr.sin_addr, &gw->ourip))
03984          memcpy(&gw->ourip, &__ourip, sizeof(gw->ourip));
03985 
03986    return (gw_reload ? NULL : gw);
03987 }
03988 
03989 static enum ast_rtp_get_result mgcp_get_rtp_peer(struct ast_channel *chan, struct ast_rtp **rtp)
03990 {
03991    struct mgcp_subchannel *sub = NULL;
03992 
03993    if (!(sub = chan->tech_pvt) || !(sub->rtp))
03994       return AST_RTP_GET_FAILED;
03995 
03996    *rtp = sub->rtp;
03997 
03998    if (sub->parent->canreinvite)
03999       return AST_RTP_TRY_NATIVE;
04000    else
04001       return AST_RTP_TRY_PARTIAL;
04002 }
04003 
04004 static int mgcp_set_rtp_peer(struct ast_channel *chan, struct ast_rtp *rtp, struct ast_rtp *vrtp, int codecs, int nat_active)
04005 {
04006    /* XXX Is there such thing as video support with MGCP? XXX */
04007    struct mgcp_subchannel *sub;
04008    sub = chan->tech_pvt;
04009    if (sub && !sub->alreadygone) {
04010       transmit_modify_with_sdp(sub, rtp, codecs);
04011       return 0;
04012    }
04013    return -1;
04014 }
04015 
04016 static struct ast_rtp_protocol mgcp_rtp = {
04017    .type = "MGCP",
04018    .get_rtp_info = mgcp_get_rtp_peer,
04019    .set_rtp_peer = mgcp_set_rtp_peer,
04020 };
04021 
04022 static void destroy_endpoint(struct mgcp_endpoint *e)
04023 {
04024    struct mgcp_subchannel *sub = e->sub->next, *s;
04025    int i;
04026 
04027    for (i = 0; i < MAX_SUBS; i++) {
04028       ast_mutex_lock(&sub->lock);
04029       if (!ast_strlen_zero(sub->cxident)) {
04030          transmit_connection_del(sub);
04031       }
04032       if (sub->rtp) {
04033          ast_rtp_destroy(sub->rtp);
04034          sub->rtp = NULL;
04035       }
04036       memset(sub->magic, 0, sizeof(sub->magic));
04037       mgcp_queue_hangup(sub);
04038       dump_cmd_queues(NULL, sub);
04039       ast_mutex_unlock(&sub->lock);
04040       sub = sub->next;
04041    }
04042 
04043    if (e->dsp) {
04044       ast_dsp_free(e->dsp);
04045    }
04046 
04047    dump_queue(e->parent, e);
04048    dump_cmd_queues(e, NULL);
04049 
04050    sub = e->sub;
04051    for (i = 0; (i < MAX_SUBS) && sub; i++) {
04052       s = sub;
04053       sub = sub->next;
04054       ast_mutex_destroy(&s->lock);
04055       ast_mutex_destroy(&s->cx_queue_lock);
04056       free(s);
04057    }
04058    ast_mutex_destroy(&e->lock);
04059    ast_mutex_destroy(&e->rqnt_queue_lock);
04060    ast_mutex_destroy(&e->cmd_queue_lock);
04061    free(e);
04062 }
04063 
04064 static void destroy_gateway(struct mgcp_gateway *g)
04065 {
04066    if (g->ha)
04067       ast_free_ha(g->ha);
04068 
04069    dump_queue(g, NULL);
04070 
04071    free (g);
04072 }
04073 
04074 static void prune_gateways(void)
04075 {
04076    struct mgcp_gateway *g, *z, *r;
04077    struct mgcp_endpoint *e, *p, *t;
04078 
04079    ast_mutex_lock(&gatelock);
04080 
04081    /* prune gateways */
04082    for (z = NULL, g = gateways; g;) {
04083       /* prune endpoints */
04084       for (p = NULL, e = g->endpoints; e; ) {
04085          if (e->delme || g->delme) {
04086             t = e;
04087             e = e->next;
04088             if (!p)
04089                g->endpoints = e;
04090             else
04091                p->next = e;
04092             destroy_endpoint(t);
04093          } else {
04094             p = e;
04095             e = e->next;
04096          }
04097       }
04098 
04099       if (g->delme) {
04100          r = g;
04101          g = g->next;
04102          if (!z)
04103             gateways = g;
04104          else
04105             z->next = g;
04106 
04107          destroy_gateway(r);
04108       } else {
04109          z = g;
04110          g = g->next;
04111       }
04112    }
04113 
04114    ast_mutex_unlock(&gatelock);
04115 }
04116 
04117 static int reload_config(void)
04118 {
04119    struct ast_config *cfg;
04120    struct ast_variable *v;
04121    struct mgcp_gateway *g;
04122    struct mgcp_endpoint *e;
04123    char *cat;
04124    struct ast_hostent ahp;
04125    struct hostent *hp;
04126    int format;
04127    
04128    if (gethostname(ourhost, sizeof(ourhost)-1)) {
04129       ast_log(LOG_WARNING, "Unable to get hostname, MGCP disabled\n");
04130       return 0;
04131    }
04132    cfg = ast_config_load(config);
04133 
04134    /* We *must* have a config file otherwise stop immediately */
04135    if (!cfg) {
04136       ast_log(LOG_NOTICE, "Unable to load config %s, MGCP disabled\n", config);
04137       return 0;
04138    }
04139    memset(&bindaddr, 0, sizeof(bindaddr));
04140    dtmfmode = 0;
04141 
04142    /* Copy the default jb config over global_jbconf */
04143    memcpy(&global_jbconf, &default_jbconf, sizeof(struct ast_jb_conf));
04144 
04145    v = ast_variable_browse(cfg, "general");
04146    while (v) {
04147       /* handle jb conf */
04148       if (!ast_jb_read_conf(&global_jbconf, v->name, v->value)) {
04149          v = v->next;
04150          continue;
04151       }
04152 
04153       /* Create the interface list */
04154       if (!strcasecmp(v->name, "bindaddr")) {
04155          if (!(hp = ast_gethostbyname(v->value, &ahp))) {
04156             ast_log(LOG_WARNING, "Invalid address: %s\n", v->value);
04157          } else {
04158             memcpy(&bindaddr.sin_addr, hp->h_addr, sizeof(bindaddr.sin_addr));
04159          }
04160       } else if (!strcasecmp(v->name, "allow")) {
04161          format = ast_getformatbyname(v->value);
04162          if (format < 1) 
04163             ast_log(LOG_WARNING, "Cannot allow unknown format '%s'\n", v->value);
04164          else
04165             capability |= format;
04166       } else if (!strcasecmp(v->name, "disallow")) {
04167          format = ast_getformatbyname(v->value);
04168          if (format < 1) 
04169             ast_log(LOG_WARNING, "Cannot disallow unknown format '%s'\n", v->value);
04170          else
04171             capability &= ~format;
04172       } else if (!strcasecmp(v->name, "tos")) {
04173          if (sscanf(v->value, "%d", &format) == 1)
04174             tos = format & 0xff;
04175          else if (!strcasecmp(v->value, "lowdelay"))
04176             tos = IPTOS_LOWDELAY;
04177          else if (!strcasecmp(v->value, "throughput"))
04178             tos = IPTOS_THROUGHPUT;
04179          else if (!strcasecmp(v->value, "reliability"))
04180             tos = IPTOS_RELIABILITY;
04181          else if (!strcasecmp(v->value, "mincost"))
04182             tos = IPTOS_MINCOST;
04183          else if (!strcasecmp(v->value, "none"))
04184             tos = 0;
04185          else
04186             ast_log(LOG_WARNING, "Invalid tos value at line %d, should be 'lowdelay', 'throughput', 'reliability', 'mincost', or 'none'\n", v->lineno);
04187       } else if (!strcasecmp(v->name, "port")) {
04188          if (sscanf(v->value, "%d", &ourport) == 1) {
04189             bindaddr.sin_port = htons(ourport);
04190          } else {
04191             ast_log(LOG_WARNING, "Invalid port number '%s' at line %d of %s\n", v->value, v->lineno, config);
04192          }
04193       }
04194       v = v->next;
04195    }
04196 
04197    /* mark existing entries for deletion */
04198    ast_mutex_lock(&gatelock);
04199    g = gateways;
04200    while (g) {
04201       g->delme = 1;
04202       e = g->endpoints;
04203       while (e) {
04204          e->delme = 1;
04205          e = e->next;
04206       }
04207       g = g->next;
04208    }
04209    ast_mutex_unlock(&gatelock);
04210    
04211    cat = ast_category_browse(cfg, NULL);
04212    while(cat) {
04213       if (strcasecmp(cat, "general")) {
04214          ast_mutex_lock(&gatelock);
04215          g = build_gateway(cat, ast_variable_browse(cfg, cat));
04216          if (g) {
04217             if (option_verbose > 2) {
04218                ast_verbose(VERBOSE_PREFIX_3 "Added gateway '%s'\n", g->name);
04219             }
04220             g->next = gateways;
04221             gateways = g;
04222          }
04223          ast_mutex_unlock(&gatelock);
04224 
04225          /* FS: process queue and IO */
04226          if (monitor_thread == pthread_self()) {
04227             if (sched) ast_sched_runq(sched);
04228             if (io) ast_io_wait(io, 10);
04229          }
04230       }
04231       cat = ast_category_browse(cfg, cat);
04232    }
04233 
04234       /* prune deleted entries etc. */
04235       prune_gateways();
04236 
04237    if (ntohl(bindaddr.sin_addr.s_addr)) {
04238       memcpy(&__ourip, &bindaddr.sin_addr, sizeof(__ourip));
04239    } else {
04240       hp = ast_gethostbyname(ourhost, &ahp);
04241       if (!hp) {
04242          ast_log(LOG_WARNING, "Unable to get our IP address, MGCP disabled\n");
04243          ast_config_destroy(cfg);
04244          return 0;
04245       }
04246       memcpy(&__ourip, hp->h_addr, sizeof(__ourip));
04247    }
04248    if (!ntohs(bindaddr.sin_port))
04249       bindaddr.sin_port = ntohs(DEFAULT_MGCP_CA_PORT);
04250    bindaddr.sin_family = AF_INET;
04251    ast_mutex_lock(&netlock);
04252    if (mgcpsock > -1)
04253       close(mgcpsock);
04254 
04255    if (mgcpsock_read_id != NULL)
04256       ast_io_remove(io, mgcpsock_read_id);
04257    mgcpsock_read_id = NULL;
04258 
04259    mgcpsock = socket(AF_INET, SOCK_DGRAM, 0);
04260    if (mgcpsock < 0) {
04261       ast_log(LOG_WARNING, "Unable to create MGCP socket: %s\n", strerror(errno));
04262    } else {
04263       if (bind(mgcpsock, (struct sockaddr *)&bindaddr, sizeof(bindaddr)) < 0) {
04264          ast_log(LOG_WARNING, "Failed to bind to %s:%d: %s\n",
04265             ast_inet_ntoa(bindaddr.sin_addr), ntohs(bindaddr.sin_port),
04266                strerror(errno));
04267          close(mgcpsock);
04268          mgcpsock = -1;
04269       } else {
04270          if (option_verbose > 1) {
04271             ast_verbose(VERBOSE_PREFIX_2 "MGCP Listening on %s:%d\n", 
04272                ast_inet_ntoa(bindaddr.sin_addr), ntohs(bindaddr.sin_port));
04273             ast_verbose(VERBOSE_PREFIX_2 "Using TOS bits %d\n", tos);
04274          }
04275          if (setsockopt(mgcpsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos))) 
04276             ast_log(LOG_WARNING, "Unable to set TOS to %d\n", tos);
04277       }
04278    }
04279    ast_mutex_unlock(&netlock);
04280    ast_config_destroy(cfg);
04281 
04282    /* send audit only to the new endpoints */
04283    g = gateways;
04284    while (g) {
04285       e = g->endpoints;
04286       while (e && e->needaudit) {
04287          e->needaudit = 0;
04288          transmit_audit_endpoint(e);
04289          ast_verbose(VERBOSE_PREFIX_3 "MGCP Auditing endpoint %s@%s for hookstate\n", e->name, g->name);
04290          e = e->next;
04291       }
04292       g = g->next;
04293    }
04294 
04295    return 0;
04296 }
04297 
04298 /*! \brief  load_module: PBX load module - initialization ---*/
04299 static int load_module(void)
04300 {
04301    if (!(sched = sched_context_create())) {
04302       ast_log(LOG_WARNING, "Unable to create schedule context\n");
04303       return AST_MODULE_LOAD_FAILURE;
04304    }
04305 
04306    if (!(io = io_context_create())) {
04307       ast_log(LOG_WARNING, "Unable to create I/O context\n");
04308       sched_context_destroy(sched);
04309       return AST_MODULE_LOAD_FAILURE;
04310    }
04311 
04312    if (reload_config())
04313       return AST_MODULE_LOAD_DECLINE;
04314 
04315    /* Make sure we can register our mgcp channel type */
04316    if (ast_channel_register(&mgcp_tech)) {
04317       ast_log(LOG_ERROR, "Unable to register channel class 'MGCP'\n");
04318       io_context_destroy(io);
04319       sched_context_destroy(sched);
04320       return AST_MODULE_LOAD_FAILURE;
04321    }
04322 
04323    ast_rtp_proto_register(&mgcp_rtp);
04324    ast_cli_register_multiple(cli_mgcp, sizeof(cli_mgcp) / sizeof(struct ast_cli_entry));
04325    
04326    /* And start the monitor for the first time */
04327    restart_monitor();
04328 
04329    return AST_MODULE_LOAD_SUCCESS;
04330 }
04331 
04332 /*! \brief  mgcp_do_reload: Reload module */
04333 static int mgcp_do_reload(void)
04334 {
04335    reload_config();
04336    return 0;
04337 }
04338 
04339 static int mgcp_reload(int fd, int argc, char *argv[])
04340 {
04341    static int deprecated = 0;
04342    if (!deprecated && argc > 0) {
04343       ast_log(LOG_WARNING, "'mgcp reload' is deprecated.  Please use 'reload chan_mgcp.so' instead.\n");
04344       deprecated = 1;
04345    }
04346 
04347    ast_mutex_lock(&mgcp_reload_lock);
04348    if (mgcp_reloading) {
04349       ast_verbose("Previous mgcp reload not yet done\n");
04350    } else
04351       mgcp_reloading = 1;
04352    ast_mutex_unlock(&mgcp_reload_lock);
04353    restart_monitor();
04354    return 0;
04355 }
04356 
04357 static int reload(void)
04358 {
04359    mgcp_reload(0, 0, NULL);
04360    return 0;
04361 }
04362 
04363 static int unload_module(void)
04364 {
04365    struct mgcp_endpoint *e;
04366    struct mgcp_gateway *g;
04367 
04368    /* Check to see if we're reloading */
04369    if (ast_mutex_trylock(&mgcp_reload_lock)) {
04370       ast_log(LOG_WARNING, "MGCP is currently reloading.  Unable to remove module.\n");
04371       return -1;
04372    } else {
04373       mgcp_reloading = 1;
04374       ast_mutex_unlock(&mgcp_reload_lock);
04375    }
04376 
04377    /* First, take us out of the channel loop */
04378    ast_channel_unregister(&mgcp_tech);
04379 
04380    /* Shut down the monitoring thread */
04381    if (!ast_mutex_lock(&monlock)) {
04382       if (monitor_thread && (monitor_thread != AST_PTHREADT_STOP)) {
04383          pthread_cancel(monitor_thread);
04384          pthread_kill(monitor_thread, SIGURG);
04385          pthread_join(monitor_thread, NULL);
04386       }
04387       monitor_thread = AST_PTHREADT_STOP;
04388       ast_mutex_unlock(&monlock);
04389    } else {
04390       ast_log(LOG_WARNING, "Unable to lock the monitor\n");
04391       /* We always want to leave this in a consistent state */
04392       ast_channel_register(&mgcp_tech);
04393       mgcp_reloading = 0;
04394       mgcp_reload(0, 0, NULL);
04395       return -1;
04396    }
04397 
04398    if (!ast_mutex_lock(&gatelock)) {
04399       for (g = gateways; g; g = g->next) {
04400          g->delme = 1;
04401          for (e = g->endpoints; e; e = e->next)
04402             e->delme = 1;
04403       }
04404 
04405       prune_gateways();
04406       ast_mutex_unlock(&gatelock);
04407    } else {
04408       ast_log(LOG_WARNING, "Unable to lock the gateways list.\n");
04409       /* We always want to leave this in a consistent state */
04410       ast_channel_register(&mgcp_tech);
04411       /* Allow the monitor to restart */
04412       monitor_thread = AST_PTHREADT_NULL;
04413       mgcp_reloading = 0;
04414       mgcp_reload(0, 0, NULL);
04415       return -1;
04416    }
04417 
04418    close(mgcpsock);
04419    ast_rtp_proto_unregister(&mgcp_rtp);
04420    ast_cli_unregister_multiple(cli_mgcp, sizeof(cli_mgcp) / sizeof(struct ast_cli_entry));
04421    sched_context_destroy(sched);
04422 
04423    return 0;
04424 }
04425 
04426 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Media Gateway Control Protocol (MGCP)",
04427       .load = load_module,
04428       .unload = unload_module,
04429       .reload = reload,
04430           );

Generated on Thu May 14 14:48:56 2009 for Asterisk - the Open Source PBX by  doxygen 1.4.7