#include "asterisk.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include "asterisk/udptl.h"
#include "asterisk/frame.h"
#include "asterisk/logger.h"
#include "asterisk/options.h"
#include "asterisk/channel.h"
#include "asterisk/acl.h"
#include "asterisk/config.h"
#include "asterisk/lock.h"
#include "asterisk/utils.h"
#include "asterisk/cli.h"
#include "asterisk/unaligned.h"
Go to the source code of this file.
Data Structures | |
struct | ast_udptl |
struct | udptl_fec_rx_buffer_t |
struct | udptl_fec_tx_buffer_t |
Defines | |
#define | FALSE 0 |
#define | LOCAL_FAX_MAX_DATAGRAM 400 |
#define | MAX_FEC_ENTRIES 5 |
#define | MAX_FEC_SPAN 5 |
#define | TRUE (!FALSE) |
#define | UDPTL_BUF_MASK 15 |
#define | UDPTL_MTU 1200 |
Functions | |
int | ast_udptl_bridge (struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc) |
void | ast_udptl_destroy (struct ast_udptl *udptl) |
int | ast_udptl_fd (struct ast_udptl *udptl) |
int | ast_udptl_get_error_correction_scheme (struct ast_udptl *udptl) |
int | ast_udptl_get_far_max_datagram (struct ast_udptl *udptl) |
int | ast_udptl_get_local_max_datagram (struct ast_udptl *udptl) |
void | ast_udptl_get_peer (struct ast_udptl *udptl, struct sockaddr_in *them) |
void | ast_udptl_get_us (struct ast_udptl *udptl, struct sockaddr_in *us) |
void | ast_udptl_init (void) |
ast_udptl * | ast_udptl_new (struct sched_context *sched, struct io_context *io, int callbackmode) |
ast_udptl * | ast_udptl_new_with_bindaddr (struct sched_context *sched, struct io_context *io, int callbackmode, struct in_addr addr) |
void | ast_udptl_offered_from_local (struct ast_udptl *udptl, int local) |
int | ast_udptl_proto_register (struct ast_udptl_protocol *proto) |
void | ast_udptl_proto_unregister (struct ast_udptl_protocol *proto) |
ast_frame * | ast_udptl_read (struct ast_udptl *udptl) |
void | ast_udptl_reload (void) |
void | ast_udptl_set_callback (struct ast_udptl *udptl, ast_udptl_callback callback) |
void | ast_udptl_set_data (struct ast_udptl *udptl, void *data) |
void | ast_udptl_set_error_correction_scheme (struct ast_udptl *udptl, int ec) |
void | ast_udptl_set_far_max_datagram (struct ast_udptl *udptl, int max_datagram) |
void | ast_udptl_set_local_max_datagram (struct ast_udptl *udptl, int max_datagram) |
void | ast_udptl_set_peer (struct ast_udptl *udptl, struct sockaddr_in *them) |
void | ast_udptl_setnat (struct ast_udptl *udptl, int nat) |
int | ast_udptl_settos (struct ast_udptl *udptl, int tos) |
void | ast_udptl_stop (struct ast_udptl *udptl) |
int | ast_udptl_write (struct ast_udptl *s, struct ast_frame *f) |
static int | decode_length (uint8_t *buf, int limit, int *len, int *pvalue) |
static int | decode_open_type (uint8_t *buf, int limit, int *len, const uint8_t **p_object, int *p_num_octets) |
static int | encode_length (uint8_t *buf, int *len, int value) |
static int | encode_open_type (uint8_t *buf, int *len, const uint8_t *data, int num_octets) |
static struct ast_udptl_protocol * | get_proto (struct ast_channel *chan) |
static int | udptl_build_packet (struct ast_udptl *s, uint8_t *buf, uint8_t *ifp, int ifp_len) |
static int | udptl_debug_test_addr (struct sockaddr_in *addr) |
static int | udptl_do_debug (int fd, int argc, char *argv[]) |
static int | udptl_do_debug_ip (int fd, int argc, char *argv[]) |
static int | udptl_nodebug (int fd, int argc, char *argv[]) |
static int | udptl_rx_packet (struct ast_udptl *s, uint8_t *buf, int len) |
static int | udptlread (int *id, int fd, short events, void *cbdata) |
Variables | |
static struct ast_cli_entry | cli_udptl [] |
static struct ast_cli_entry | cli_udptl_no_debug |
static char | debug_usage [] |
static char | nodebug_usage [] |
static struct ast_udptl_protocol * | protos |
static int | udptldebug |
static struct sockaddr_in | udptldebugaddr |
static int | udptlend |
static int | udptlfecentries |
static int | udptlfecspan |
static int | udptlfectype |
static int | udptlmaxdatagram |
static int | udptlstart |
#define LOCAL_FAX_MAX_DATAGRAM 400 |
Definition at line 70 of file udptl.c.
Referenced by ast_udptl_reload(), ast_udptl_write(), and udptl_build_packet().
#define MAX_FEC_ENTRIES 5 |
#define MAX_FEC_SPAN 5 |
int ast_udptl_bridge | ( | struct ast_channel * | c0, | |
struct ast_channel * | c1, | |||
int | flags, | |||
struct ast_frame ** | fo, | |||
struct ast_channel ** | rc | |||
) |
Definition at line 961 of file udptl.c.
References ast_channel_lock, ast_channel_trylock, ast_channel_unlock, ast_check_hangup(), AST_FRAME_MODEM, ast_frfree, ast_inet_ntoa(), ast_log(), ast_read(), ast_udptl_get_peer(), ast_waitfor_n(), ast_write(), f, get_proto(), ast_udptl_protocol::get_udptl_info, inaddrcmp(), LOG_DEBUG, LOG_WARNING, ast_channel::masq, ast_channel::masqr, ast_channel::name, ast_udptl_protocol::set_udptl_peer, and ast_channel::tech_pvt.
00962 { 00963 struct ast_frame *f; 00964 struct ast_channel *who; 00965 struct ast_channel *cs[3]; 00966 struct ast_udptl *p0; 00967 struct ast_udptl *p1; 00968 struct ast_udptl_protocol *pr0; 00969 struct ast_udptl_protocol *pr1; 00970 struct sockaddr_in ac0; 00971 struct sockaddr_in ac1; 00972 struct sockaddr_in t0; 00973 struct sockaddr_in t1; 00974 void *pvt0; 00975 void *pvt1; 00976 int to; 00977 00978 ast_channel_lock(c0); 00979 while (ast_channel_trylock(c1)) { 00980 ast_channel_unlock(c0); 00981 usleep(1); 00982 ast_channel_lock(c0); 00983 } 00984 pr0 = get_proto(c0); 00985 pr1 = get_proto(c1); 00986 if (!pr0) { 00987 ast_log(LOG_WARNING, "Can't find native functions for channel '%s'\n", c0->name); 00988 ast_channel_unlock(c0); 00989 ast_channel_unlock(c1); 00990 return -1; 00991 } 00992 if (!pr1) { 00993 ast_log(LOG_WARNING, "Can't find native functions for channel '%s'\n", c1->name); 00994 ast_channel_unlock(c0); 00995 ast_channel_unlock(c1); 00996 return -1; 00997 } 00998 pvt0 = c0->tech_pvt; 00999 pvt1 = c1->tech_pvt; 01000 p0 = pr0->get_udptl_info(c0); 01001 p1 = pr1->get_udptl_info(c1); 01002 if (!p0 || !p1) { 01003 /* Somebody doesn't want to play... */ 01004 ast_channel_unlock(c0); 01005 ast_channel_unlock(c1); 01006 return -2; 01007 } 01008 if (pr0->set_udptl_peer(c0, p1)) { 01009 ast_log(LOG_WARNING, "Channel '%s' failed to talk to '%s'\n", c0->name, c1->name); 01010 memset(&ac1, 0, sizeof(ac1)); 01011 } else { 01012 /* Store UDPTL peer */ 01013 ast_udptl_get_peer(p1, &ac1); 01014 } 01015 if (pr1->set_udptl_peer(c1, p0)) { 01016 ast_log(LOG_WARNING, "Channel '%s' failed to talk back to '%s'\n", c1->name, c0->name); 01017 memset(&ac0, 0, sizeof(ac0)); 01018 } else { 01019 /* Store UDPTL peer */ 01020 ast_udptl_get_peer(p0, &ac0); 01021 } 01022 ast_channel_unlock(c0); 01023 ast_channel_unlock(c1); 01024 cs[0] = c0; 01025 cs[1] = c1; 01026 cs[2] = NULL; 01027 for (;;) { 01028 if ((c0->tech_pvt != pvt0) || 01029 (c1->tech_pvt != pvt1) || 01030 (c0->masq || c0->masqr || c1->masq || c1->masqr)) { 01031 ast_log(LOG_DEBUG, "Oooh, something is weird, backing out\n"); 01032 /* Tell it to try again later */ 01033 return -3; 01034 } 01035 to = -1; 01036 ast_udptl_get_peer(p1, &t1); 01037 ast_udptl_get_peer(p0, &t0); 01038 if (inaddrcmp(&t1, &ac1)) { 01039 ast_log(LOG_DEBUG, "Oooh, '%s' changed end address to %s:%d\n", 01040 c1->name, ast_inet_ntoa(t1.sin_addr), ntohs(t1.sin_port)); 01041 ast_log(LOG_DEBUG, "Oooh, '%s' was %s:%d\n", 01042 c1->name, ast_inet_ntoa(ac1.sin_addr), ntohs(ac1.sin_port)); 01043 memcpy(&ac1, &t1, sizeof(ac1)); 01044 } 01045 if (inaddrcmp(&t0, &ac0)) { 01046 ast_log(LOG_DEBUG, "Oooh, '%s' changed end address to %s:%d\n", 01047 c0->name, ast_inet_ntoa(t0.sin_addr), ntohs(t0.sin_port)); 01048 ast_log(LOG_DEBUG, "Oooh, '%s' was %s:%d\n", 01049 c0->name, ast_inet_ntoa(ac0.sin_addr), ntohs(ac0.sin_port)); 01050 memcpy(&ac0, &t0, sizeof(ac0)); 01051 } 01052 who = ast_waitfor_n(cs, 2, &to); 01053 if (!who) { 01054 ast_log(LOG_DEBUG, "Ooh, empty read...\n"); 01055 /* check for hangup / whentohangup */ 01056 if (ast_check_hangup(c0) || ast_check_hangup(c1)) 01057 break; 01058 continue; 01059 } 01060 f = ast_read(who); 01061 if (!f) { 01062 *fo = f; 01063 *rc = who; 01064 ast_log(LOG_DEBUG, "Oooh, got a %s\n", f ? "digit" : "hangup"); 01065 /* That's all we needed */ 01066 return 0; 01067 } else { 01068 if (f->frametype == AST_FRAME_MODEM) { 01069 /* Forward T.38 frames if they happen upon us */ 01070 if (who == c0) { 01071 ast_write(c1, f); 01072 } else if (who == c1) { 01073 ast_write(c0, f); 01074 } 01075 } 01076 ast_frfree(f); 01077 } 01078 /* Swap priority. Not that it's a big deal at this point */ 01079 cs[2] = cs[0]; 01080 cs[0] = cs[1]; 01081 cs[1] = cs[2]; 01082 } 01083 return -1; 01084 }
void ast_udptl_destroy | ( | struct ast_udptl * | udptl | ) |
Definition at line 861 of file udptl.c.
References ast_io_remove(), ast_udptl::fd, free, ast_udptl::io, and ast_udptl::ioid.
Referenced by __sip_destroy(), and create_addr_from_peer().
00862 { 00863 if (udptl->ioid) 00864 ast_io_remove(udptl->io, udptl->ioid); 00865 if (udptl->fd > -1) 00866 close(udptl->fd); 00867 free(udptl); 00868 }
int ast_udptl_fd | ( | struct ast_udptl * | udptl | ) |
Definition at line 587 of file udptl.c.
References ast_udptl::fd.
Referenced by __oh323_new(), and sip_new().
00588 { 00589 return udptl->fd; 00590 }
int ast_udptl_get_error_correction_scheme | ( | struct ast_udptl * | udptl | ) |
Definition at line 678 of file udptl.c.
References ast_log(), ast_udptl::error_correction_scheme, and LOG_WARNING.
Referenced by create_addr_from_peer(), sip_alloc(), and sip_handle_t38_reinvite().
00679 { 00680 if (udptl) 00681 return udptl->error_correction_scheme; 00682 else { 00683 ast_log(LOG_WARNING, "udptl structure is null\n"); 00684 return -1; 00685 } 00686 }
int ast_udptl_get_far_max_datagram | ( | struct ast_udptl * | udptl | ) |
Definition at line 718 of file udptl.c.
References ast_log(), ast_udptl::far_max_datagram_size, and LOG_WARNING.
00719 { 00720 if (udptl) 00721 return udptl->far_max_datagram_size; 00722 else { 00723 ast_log(LOG_WARNING, "udptl structure is null\n"); 00724 return -1; 00725 } 00726 }
int ast_udptl_get_local_max_datagram | ( | struct ast_udptl * | udptl | ) |
Definition at line 708 of file udptl.c.
References ast_log(), ast_udptl::local_max_datagram_size, and LOG_WARNING.
Referenced by add_t38_sdp(), and sip_handle_t38_reinvite().
00709 { 00710 if (udptl) 00711 return udptl->local_max_datagram_size; 00712 else { 00713 ast_log(LOG_WARNING, "udptl structure is null\n"); 00714 return -1; 00715 } 00716 }
void ast_udptl_get_peer | ( | struct ast_udptl * | udptl, | |
struct sockaddr_in * | them | |||
) |
Definition at line 842 of file udptl.c.
References ast_udptl::them.
Referenced by ast_udptl_bridge(), sip_handle_t38_reinvite(), and sip_set_udptl_peer().
00843 { 00844 memset(them, 0, sizeof(*them)); 00845 them->sin_family = AF_INET; 00846 them->sin_port = udptl->them.sin_port; 00847 them->sin_addr = udptl->them.sin_addr; 00848 }
void ast_udptl_get_us | ( | struct ast_udptl * | udptl, | |
struct sockaddr_in * | us | |||
) |
void ast_udptl_init | ( | void | ) |
Definition at line 1243 of file udptl.c.
References ast_cli_register_multiple(), ast_udptl_reload(), and cli_udptl.
Referenced by main().
01244 { 01245 ast_cli_register_multiple(cli_udptl, sizeof(cli_udptl) / sizeof(struct ast_cli_entry)); 01246 ast_udptl_reload(); 01247 }
struct ast_udptl* ast_udptl_new | ( | struct sched_context * | sched, | |
struct io_context * | io, | |||
int | callbackmode | |||
) |
Definition at line 820 of file udptl.c.
References ast_udptl_new_with_bindaddr(), io, and sched.
00821 { 00822 struct in_addr ia; 00823 memset(&ia, 0, sizeof(ia)); 00824 return ast_udptl_new_with_bindaddr(sched, io, callbackmode, ia); 00825 }
struct ast_udptl* ast_udptl_new_with_bindaddr | ( | struct sched_context * | sched, | |
struct io_context * | io, | |||
int | callbackmode, | |||
struct in_addr | addr | |||
) |
Definition at line 744 of file udptl.c.
References ast_calloc, ast_io_add(), AST_IO_IN, ast_log(), ast_random(), errno, ast_udptl::flags, free, io, LOG_WARNING, sched, UDPTL_ERROR_CORRECTION_FEC, UDPTL_ERROR_CORRECTION_NONE, UDPTL_ERROR_CORRECTION_REDUNDANCY, and udptlread().
Referenced by ast_udptl_new(), and sip_alloc().
00745 { 00746 struct ast_udptl *udptl; 00747 int x; 00748 int startplace; 00749 int i; 00750 long int flags; 00751 00752 if (!(udptl = ast_calloc(1, sizeof(*udptl)))) 00753 return NULL; 00754 00755 if (udptlfectype == 2) 00756 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_FEC; 00757 else if (udptlfectype == 1) 00758 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_REDUNDANCY; 00759 else 00760 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_NONE; 00761 udptl->error_correction_span = udptlfecspan; 00762 udptl->error_correction_entries = udptlfecentries; 00763 00764 udptl->far_max_datagram_size = udptlmaxdatagram; 00765 udptl->local_max_datagram_size = udptlmaxdatagram; 00766 00767 memset(&udptl->rx, 0, sizeof(udptl->rx)); 00768 memset(&udptl->tx, 0, sizeof(udptl->tx)); 00769 for (i = 0; i <= UDPTL_BUF_MASK; i++) { 00770 udptl->rx[i].buf_len = -1; 00771 udptl->tx[i].buf_len = -1; 00772 } 00773 00774 udptl->them.sin_family = AF_INET; 00775 udptl->us.sin_family = AF_INET; 00776 00777 if ((udptl->fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 00778 free(udptl); 00779 ast_log(LOG_WARNING, "Unable to allocate socket: %s\n", strerror(errno)); 00780 return NULL; 00781 } 00782 flags = fcntl(udptl->fd, F_GETFL); 00783 fcntl(udptl->fd, F_SETFL, flags | O_NONBLOCK); 00784 #ifdef SO_NO_CHECK 00785 if (nochecksums) 00786 setsockopt(udptl->fd, SOL_SOCKET, SO_NO_CHECK, &nochecksums, sizeof(nochecksums)); 00787 #endif 00788 /* Find us a place */ 00789 x = (ast_random() % (udptlend - udptlstart)) + udptlstart; 00790 startplace = x; 00791 for (;;) { 00792 udptl->us.sin_port = htons(x); 00793 udptl->us.sin_addr = addr; 00794 if (bind(udptl->fd, (struct sockaddr *) &udptl->us, sizeof(udptl->us)) == 0) 00795 break; 00796 if (errno != EADDRINUSE) { 00797 ast_log(LOG_WARNING, "Unexpected bind error: %s\n", strerror(errno)); 00798 close(udptl->fd); 00799 free(udptl); 00800 return NULL; 00801 } 00802 if (++x > udptlend) 00803 x = udptlstart; 00804 if (x == startplace) { 00805 ast_log(LOG_WARNING, "No UDPTL ports remaining\n"); 00806 close(udptl->fd); 00807 free(udptl); 00808 return NULL; 00809 } 00810 } 00811 if (io && sched && callbackmode) { 00812 /* Operate this one in a callback mode */ 00813 udptl->sched = sched; 00814 udptl->io = io; 00815 udptl->ioid = ast_io_add(udptl->io, udptl->fd, udptlread, AST_IO_IN, udptl); 00816 } 00817 return udptl; 00818 }
void ast_udptl_offered_from_local | ( | struct ast_udptl * | udptl, | |
int | local | |||
) |
Definition at line 670 of file udptl.c.
References ast_log(), LOG_WARNING, and ast_udptl::udptl_offered_from_local.
Referenced by transmit_invite(), transmit_reinvite_with_t38_sdp(), and transmit_response_with_t38_sdp().
00671 { 00672 if (udptl) 00673 udptl->udptl_offered_from_local = local; 00674 else 00675 ast_log(LOG_WARNING, "udptl structure is null\n"); 00676 }
int ast_udptl_proto_register | ( | struct ast_udptl_protocol * | proto | ) |
Definition at line 931 of file udptl.c.
References ast_log(), LOG_WARNING, ast_udptl_protocol::next, protos, and ast_udptl_protocol::type.
Referenced by load_module().
00932 { 00933 struct ast_udptl_protocol *cur; 00934 00935 cur = protos; 00936 while (cur) { 00937 if (cur->type == proto->type) { 00938 ast_log(LOG_WARNING, "Tried to register same protocol '%s' twice\n", cur->type); 00939 return -1; 00940 } 00941 cur = cur->next; 00942 } 00943 proto->next = protos; 00944 protos = proto; 00945 return 0; 00946 }
void ast_udptl_proto_unregister | ( | struct ast_udptl_protocol * | proto | ) |
Definition at line 911 of file udptl.c.
References ast_udptl_protocol::next, and protos.
Referenced by unload_module().
00912 { 00913 struct ast_udptl_protocol *cur; 00914 struct ast_udptl_protocol *prev; 00915 00916 cur = protos; 00917 prev = NULL; 00918 while (cur) { 00919 if (cur == proto) { 00920 if (prev) 00921 prev->next = proto->next; 00922 else 00923 protos = proto->next; 00924 return; 00925 } 00926 prev = cur; 00927 cur = cur->next; 00928 } 00929 }
Definition at line 619 of file udptl.c.
References ast_assert, AST_FRIENDLY_OFFSET, ast_inet_ntoa(), ast_log(), ast_null_frame, ast_verbose(), errno, ast_udptl::f, ast_udptl::fd, len(), LOG_DEBUG, LOG_WARNING, ast_udptl::nat, ast_udptl::rawdata, ast_udptl::them, udptl_debug_test_addr(), and udptl_rx_packet().
Referenced by sip_rtp_read(), skinny_rtp_read(), and udptlread().
00620 { 00621 int res; 00622 struct sockaddr_in sin; 00623 socklen_t len; 00624 uint16_t seqno = 0; 00625 uint16_t *udptlheader; 00626 00627 len = sizeof(sin); 00628 00629 /* Cache where the header will go */ 00630 res = recvfrom(udptl->fd, 00631 udptl->rawdata + AST_FRIENDLY_OFFSET, 00632 sizeof(udptl->rawdata) - AST_FRIENDLY_OFFSET, 00633 0, 00634 (struct sockaddr *) &sin, 00635 &len); 00636 udptlheader = (uint16_t *)(udptl->rawdata + AST_FRIENDLY_OFFSET); 00637 if (res < 0) { 00638 if (errno != EAGAIN) 00639 ast_log(LOG_WARNING, "UDPTL read error: %s\n", strerror(errno)); 00640 ast_assert(errno != EBADF); 00641 return &ast_null_frame; 00642 } 00643 00644 /* Ignore if the other side hasn't been given an address yet. */ 00645 if (!udptl->them.sin_addr.s_addr || !udptl->them.sin_port) 00646 return &ast_null_frame; 00647 00648 if (udptl->nat) { 00649 /* Send to whoever sent to us */ 00650 if ((udptl->them.sin_addr.s_addr != sin.sin_addr.s_addr) || 00651 (udptl->them.sin_port != sin.sin_port)) { 00652 memcpy(&udptl->them, &sin, sizeof(udptl->them)); 00653 ast_log(LOG_DEBUG, "UDPTL NAT: Using address %s:%d\n", ast_inet_ntoa(udptl->them.sin_addr), ntohs(udptl->them.sin_port)); 00654 } 00655 } 00656 00657 if (udptl_debug_test_addr(&sin)) { 00658 ast_verbose("Got UDPTL packet from %s:%d (type %d, seq %d, len %d)\n", 00659 ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), 0, seqno, res); 00660 } 00661 #if 0 00662 printf("Got UDPTL packet from %s:%d (seq %d, len = %d)\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), seqno, res); 00663 #endif 00664 if (udptl_rx_packet(udptl, udptl->rawdata + AST_FRIENDLY_OFFSET, res) < 1) 00665 return &ast_null_frame; 00666 00667 return &udptl->f[0]; 00668 }
void ast_udptl_reload | ( | void | ) |
Definition at line 1167 of file udptl.c.
References ast_config_destroy(), ast_config_load(), ast_false(), ast_log(), ast_variable_retrieve(), ast_verbose(), LOCAL_FAX_MAX_DATAGRAM, LOG_WARNING, MAX_FEC_ENTRIES, MAX_FEC_SPAN, option_verbose, s, and VERBOSE_PREFIX_2.
Referenced by ast_udptl_init().
01168 { 01169 struct ast_config *cfg; 01170 const char *s; 01171 01172 udptlstart = 4500; 01173 udptlend = 4999; 01174 udptlfectype = 0; 01175 udptlfecentries = 0; 01176 udptlfecspan = 0; 01177 udptlmaxdatagram = 0; 01178 01179 if ((cfg = ast_config_load("udptl.conf"))) { 01180 if ((s = ast_variable_retrieve(cfg, "general", "udptlstart"))) { 01181 udptlstart = atoi(s); 01182 if (udptlstart < 1024) 01183 udptlstart = 1024; 01184 if (udptlstart > 65535) 01185 udptlstart = 65535; 01186 } 01187 if ((s = ast_variable_retrieve(cfg, "general", "udptlend"))) { 01188 udptlend = atoi(s); 01189 if (udptlend < 1024) 01190 udptlend = 1024; 01191 if (udptlend > 65535) 01192 udptlend = 65535; 01193 } 01194 if ((s = ast_variable_retrieve(cfg, "general", "udptlchecksums"))) { 01195 #ifdef SO_NO_CHECK 01196 if (ast_false(s)) 01197 nochecksums = 1; 01198 else 01199 nochecksums = 0; 01200 #else 01201 if (ast_false(s)) 01202 ast_log(LOG_WARNING, "Disabling UDPTL checksums is not supported on this operating system!\n"); 01203 #endif 01204 } 01205 if ((s = ast_variable_retrieve(cfg, "general", "T38FaxUdpEC"))) { 01206 if (strcmp(s, "t38UDPFEC") == 0) 01207 udptlfectype = 2; 01208 else if (strcmp(s, "t38UDPRedundancy") == 0) 01209 udptlfectype = 1; 01210 } 01211 if ((s = ast_variable_retrieve(cfg, "general", "T38FaxMaxDatagram"))) { 01212 udptlmaxdatagram = atoi(s); 01213 if (udptlmaxdatagram < 0) 01214 udptlmaxdatagram = 0; 01215 if (udptlmaxdatagram > LOCAL_FAX_MAX_DATAGRAM) 01216 udptlmaxdatagram = LOCAL_FAX_MAX_DATAGRAM; 01217 } 01218 if ((s = ast_variable_retrieve(cfg, "general", "UDPTLFECentries"))) { 01219 udptlfecentries = atoi(s); 01220 if (udptlfecentries < 0) 01221 udptlfecentries = 0; 01222 if (udptlfecentries > MAX_FEC_ENTRIES) 01223 udptlfecentries = MAX_FEC_ENTRIES; 01224 } 01225 if ((s = ast_variable_retrieve(cfg, "general", "UDPTLFECspan"))) { 01226 udptlfecspan = atoi(s); 01227 if (udptlfecspan < 0) 01228 udptlfecspan = 0; 01229 if (udptlfecspan > MAX_FEC_SPAN) 01230 udptlfecspan = MAX_FEC_SPAN; 01231 } 01232 ast_config_destroy(cfg); 01233 } 01234 if (udptlstart >= udptlend) { 01235 ast_log(LOG_WARNING, "Unreasonable values for UDPTL start/end\n"); 01236 udptlstart = 4500; 01237 udptlend = 4999; 01238 } 01239 if (option_verbose > 1) 01240 ast_verbose(VERBOSE_PREFIX_2 "UDPTL allocating from port range %d -> %d\n", udptlstart, udptlend); 01241 }
void ast_udptl_set_callback | ( | struct ast_udptl * | udptl, | |
ast_udptl_callback | callback | |||
) |
Definition at line 597 of file udptl.c.
References ast_udptl::callback.
00598 { 00599 udptl->callback = callback; 00600 }
void ast_udptl_set_data | ( | struct ast_udptl * | udptl, | |
void * | data | |||
) |
Definition at line 592 of file udptl.c.
References ast_udptl::data.
00593 { 00594 udptl->data = data; 00595 }
void ast_udptl_set_error_correction_scheme | ( | struct ast_udptl * | udptl, | |
int | ec | |||
) |
Definition at line 688 of file udptl.c.
References ast_log(), ast_udptl::error_correction_scheme, LOG_WARNING, UDPTL_ERROR_CORRECTION_FEC, UDPTL_ERROR_CORRECTION_NONE, and UDPTL_ERROR_CORRECTION_REDUNDANCY.
Referenced by process_sdp(), and sip_handle_t38_reinvite().
00689 { 00690 if (udptl) { 00691 switch (ec) { 00692 case UDPTL_ERROR_CORRECTION_FEC: 00693 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_FEC; 00694 break; 00695 case UDPTL_ERROR_CORRECTION_REDUNDANCY: 00696 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_REDUNDANCY; 00697 break; 00698 case UDPTL_ERROR_CORRECTION_NONE: 00699 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_NONE; 00700 break; 00701 default: 00702 ast_log(LOG_WARNING, "error correction parameter invalid\n"); 00703 }; 00704 } else 00705 ast_log(LOG_WARNING, "udptl structure is null\n"); 00706 }
void ast_udptl_set_far_max_datagram | ( | struct ast_udptl * | udptl, | |
int | max_datagram | |||
) |
Definition at line 736 of file udptl.c.
References ast_log(), ast_udptl::far_max_datagram_size, and LOG_WARNING.
Referenced by process_sdp(), and sip_handle_t38_reinvite().
00737 { 00738 if (udptl) 00739 udptl->far_max_datagram_size = max_datagram; 00740 else 00741 ast_log(LOG_WARNING, "udptl structure is null\n"); 00742 }
void ast_udptl_set_local_max_datagram | ( | struct ast_udptl * | udptl, | |
int | max_datagram | |||
) |
Definition at line 728 of file udptl.c.
References ast_log(), ast_udptl::local_max_datagram_size, and LOG_WARNING.
Referenced by process_sdp(), and sip_handle_t38_reinvite().
00729 { 00730 if (udptl) 00731 udptl->local_max_datagram_size = max_datagram; 00732 else 00733 ast_log(LOG_WARNING, "udptl structure is null\n"); 00734 }
void ast_udptl_set_peer | ( | struct ast_udptl * | udptl, | |
struct sockaddr_in * | them | |||
) |
Definition at line 836 of file udptl.c.
References ast_udptl::them.
Referenced by process_sdp().
00837 { 00838 udptl->them.sin_port = them->sin_port; 00839 udptl->them.sin_addr = them->sin_addr; 00840 }
void ast_udptl_setnat | ( | struct ast_udptl * | udptl, | |
int | nat | |||
) |
int ast_udptl_settos | ( | struct ast_udptl * | udptl, | |
int | tos | |||
) |
Definition at line 827 of file udptl.c.
References ast_log(), ast_udptl::fd, and LOG_WARNING.
Referenced by sip_alloc().
00828 { 00829 int res; 00830 00831 if ((res = setsockopt(udptl->fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)))) 00832 ast_log(LOG_WARNING, "UDPTL unable to set TOS to %d\n", tos); 00833 return res; 00834 }
void ast_udptl_stop | ( | struct ast_udptl * | udptl | ) |
Definition at line 855 of file udptl.c.
References ast_udptl::them.
Referenced by process_sdp(), and stop_media_flows().
00856 { 00857 memset(&udptl->them.sin_addr, 0, sizeof(udptl->them.sin_addr)); 00858 memset(&udptl->them.sin_port, 0, sizeof(udptl->them.sin_port)); 00859 }
Definition at line 870 of file udptl.c.
References AST_FRAME_MODEM, ast_inet_ntoa(), ast_log(), ast_verbose(), errno, f, len(), LOCAL_FAX_MAX_DATAGRAM, LOG_NOTICE, LOG_WARNING, s, seq, udptl_build_packet(), and udptl_debug_test_addr().
Referenced by sip_write().
00871 { 00872 int seq; 00873 int len; 00874 int res; 00875 uint8_t buf[LOCAL_FAX_MAX_DATAGRAM]; 00876 00877 /* If we have no peer, return immediately */ 00878 if (s->them.sin_addr.s_addr == INADDR_ANY) 00879 return 0; 00880 00881 /* If there is no data length, return immediately */ 00882 if (f->datalen == 0) 00883 return 0; 00884 00885 if (f->frametype != AST_FRAME_MODEM) { 00886 ast_log(LOG_WARNING, "UDPTL can only send T.38 data\n"); 00887 return -1; 00888 } 00889 00890 /* Save seq_no for debug output because udptl_build_packet increments it */ 00891 seq = s->tx_seq_no & 0xFFFF; 00892 00893 /* Cook up the UDPTL packet, with the relevant EC info. */ 00894 len = udptl_build_packet(s, buf, f->data, f->datalen); 00895 00896 if (len > 0 && s->them.sin_port && s->them.sin_addr.s_addr) { 00897 if ((res = sendto(s->fd, buf, len, 0, (struct sockaddr *) &s->them, sizeof(s->them))) < 0) 00898 ast_log(LOG_NOTICE, "UDPTL Transmission error to %s:%d: %s\n", ast_inet_ntoa(s->them.sin_addr), ntohs(s->them.sin_port), strerror(errno)); 00899 #if 0 00900 printf("Sent %d bytes of UDPTL data to %s:%d\n", res, ast_inet_ntoa(udptl->them.sin_addr), ntohs(udptl->them.sin_port)); 00901 #endif 00902 if (udptl_debug_test_addr(&s->them)) 00903 ast_verbose("Sent UDPTL packet to %s:%d (type %d, seq %d, len %d)\n", 00904 ast_inet_ntoa(s->them.sin_addr), 00905 ntohs(s->them.sin_port), 0, seq, len); 00906 } 00907 00908 return 0; 00909 }
static int decode_length | ( | uint8_t * | buf, | |
int | limit, | |||
int * | len, | |||
int * | pvalue | |||
) | [static] |
Definition at line 157 of file udptl.c.
Referenced by decode_open_type(), and udptl_rx_packet().
00158 { 00159 if (*len >= limit) 00160 return -1; 00161 if ((buf[*len] & 0x80) == 0) { 00162 *pvalue = buf[*len]; 00163 (*len)++; 00164 return 0; 00165 } 00166 if ((buf[*len] & 0x40) == 0) { 00167 if (*len == limit - 1) 00168 return -1; 00169 *pvalue = (buf[*len] & 0x3F) << 8; 00170 (*len)++; 00171 *pvalue |= buf[*len]; 00172 (*len)++; 00173 return 0; 00174 } 00175 *pvalue = (buf[*len] & 0x3F) << 14; 00176 (*len)++; 00177 /* Indicate we have a fragment */ 00178 return 1; 00179 }
static int decode_open_type | ( | uint8_t * | buf, | |
int | limit, | |||
int * | len, | |||
const uint8_t ** | p_object, | |||
int * | p_num_octets | |||
) | [static] |
Definition at line 182 of file udptl.c.
References decode_length().
Referenced by udptl_rx_packet().
00183 { 00184 int octet_cnt; 00185 int octet_idx; 00186 int stat; 00187 int i; 00188 const uint8_t **pbuf; 00189 00190 for (octet_idx = 0, *p_num_octets = 0; ; octet_idx += octet_cnt) { 00191 if ((stat = decode_length(buf, limit, len, &octet_cnt)) < 0) 00192 return -1; 00193 if (octet_cnt > 0) { 00194 *p_num_octets += octet_cnt; 00195 00196 pbuf = &p_object[octet_idx]; 00197 i = 0; 00198 /* Make sure the buffer contains at least the number of bits requested */ 00199 if ((*len + octet_cnt) > limit) 00200 return -1; 00201 00202 *pbuf = &buf[*len]; 00203 *len += octet_cnt; 00204 } 00205 if (stat == 0) 00206 break; 00207 } 00208 return 0; 00209 }
static int encode_length | ( | uint8_t * | buf, | |
int * | len, | |||
int | value | |||
) | [static] |
Definition at line 212 of file udptl.c.
Referenced by encode_open_type(), and udptl_build_packet().
00213 { 00214 int multiplier; 00215 00216 if (value < 0x80) { 00217 /* 1 octet */ 00218 buf[*len] = value; 00219 (*len)++; 00220 return value; 00221 } 00222 if (value < 0x4000) { 00223 /* 2 octets */ 00224 /* Set the first bit of the first octet */ 00225 buf[*len] = ((0x8000 | value) >> 8) & 0xFF; 00226 (*len)++; 00227 buf[*len] = value & 0xFF; 00228 (*len)++; 00229 return value; 00230 } 00231 /* Fragmentation */ 00232 multiplier = (value < 0x10000) ? (value >> 14) : 4; 00233 /* Set the first 2 bits of the octet */ 00234 buf[*len] = 0xC0 | multiplier; 00235 (*len)++; 00236 return multiplier << 14; 00237 }
static int encode_open_type | ( | uint8_t * | buf, | |
int * | len, | |||
const uint8_t * | data, | |||
int | num_octets | |||
) | [static] |
Definition at line 240 of file udptl.c.
References encode_length().
Referenced by udptl_build_packet().
00241 { 00242 int enclen; 00243 int octet_idx; 00244 uint8_t zero_byte; 00245 00246 /* If open type is of zero length, add a single zero byte (10.1) */ 00247 if (num_octets == 0) { 00248 zero_byte = 0; 00249 data = &zero_byte; 00250 num_octets = 1; 00251 } 00252 /* Encode the open type */ 00253 for (octet_idx = 0; ; num_octets -= enclen, octet_idx += enclen) { 00254 if ((enclen = encode_length(buf, len, num_octets)) < 0) 00255 return -1; 00256 if (enclen > 0) { 00257 memcpy(&buf[*len], &data[octet_idx], enclen); 00258 *len += enclen; 00259 } 00260 if (enclen >= num_octets) 00261 break; 00262 } 00263 00264 return 0; 00265 }
static struct ast_udptl_protocol* get_proto | ( | struct ast_channel * | chan | ) | [static] |
Definition at line 948 of file udptl.c.
References ast_udptl_protocol::next, protos, ast_channel::tech, ast_channel_tech::type, and ast_udptl_protocol::type.
00949 { 00950 struct ast_udptl_protocol *cur; 00951 00952 cur = protos; 00953 while (cur) { 00954 if (cur->type == chan->tech->type) 00955 return cur; 00956 cur = cur->next; 00957 } 00958 return NULL; 00959 }
static int udptl_build_packet | ( | struct ast_udptl * | s, | |
uint8_t * | buf, | |||
uint8_t * | ifp, | |||
int | ifp_len | |||
) | [static] |
Definition at line 476 of file udptl.c.
References encode_length(), encode_open_type(), len(), LOCAL_FAX_MAX_DATAGRAM, s, seq, UDPTL_ERROR_CORRECTION_FEC, UDPTL_ERROR_CORRECTION_NONE, and UDPTL_ERROR_CORRECTION_REDUNDANCY.
Referenced by ast_udptl_write().
00477 { 00478 uint8_t fec[LOCAL_FAX_MAX_DATAGRAM]; 00479 int i; 00480 int j; 00481 int seq; 00482 int entry; 00483 int entries; 00484 int span; 00485 int m; 00486 int len; 00487 int limit; 00488 int high_tide; 00489 00490 seq = s->tx_seq_no & 0xFFFF; 00491 00492 /* Map the sequence number to an entry in the circular buffer */ 00493 entry = seq & UDPTL_BUF_MASK; 00494 00495 /* We save the message in a circular buffer, for generating FEC or 00496 redundancy sets later on. */ 00497 s->tx[entry].buf_len = ifp_len; 00498 memcpy(s->tx[entry].buf, ifp, ifp_len); 00499 00500 /* Build the UDPTLPacket */ 00501 00502 len = 0; 00503 /* Encode the sequence number */ 00504 buf[len++] = (seq >> 8) & 0xFF; 00505 buf[len++] = seq & 0xFF; 00506 00507 /* Encode the primary IFP packet */ 00508 if (encode_open_type(buf, &len, ifp, ifp_len) < 0) 00509 return -1; 00510 00511 /* Encode the appropriate type of error recovery information */ 00512 switch (s->error_correction_scheme) 00513 { 00514 case UDPTL_ERROR_CORRECTION_NONE: 00515 /* Encode the error recovery type */ 00516 buf[len++] = 0x00; 00517 /* The number of entries will always be zero, so it is pointless allowing 00518 for the fragmented case here. */ 00519 if (encode_length(buf, &len, 0) < 0) 00520 return -1; 00521 break; 00522 case UDPTL_ERROR_CORRECTION_REDUNDANCY: 00523 /* Encode the error recovery type */ 00524 buf[len++] = 0x00; 00525 if (s->tx_seq_no > s->error_correction_entries) 00526 entries = s->error_correction_entries; 00527 else 00528 entries = s->tx_seq_no; 00529 /* The number of entries will always be small, so it is pointless allowing 00530 for the fragmented case here. */ 00531 if (encode_length(buf, &len, entries) < 0) 00532 return -1; 00533 /* Encode the elements */ 00534 for (i = 0; i < entries; i++) { 00535 j = (entry - i - 1) & UDPTL_BUF_MASK; 00536 if (encode_open_type(buf, &len, s->tx[j].buf, s->tx[j].buf_len) < 0) 00537 return -1; 00538 } 00539 break; 00540 case UDPTL_ERROR_CORRECTION_FEC: 00541 span = s->error_correction_span; 00542 entries = s->error_correction_entries; 00543 if (seq < s->error_correction_span*s->error_correction_entries) { 00544 /* In the initial stages, wind up the FEC smoothly */ 00545 entries = seq/s->error_correction_span; 00546 if (seq < s->error_correction_span) 00547 span = 0; 00548 } 00549 /* Encode the error recovery type */ 00550 buf[len++] = 0x80; 00551 /* Span is defined as an inconstrained integer, which it dumb. It will only 00552 ever be a small value. Treat it as such. */ 00553 buf[len++] = 1; 00554 buf[len++] = span; 00555 /* The number of entries is defined as a length, but will only ever be a small 00556 value. Treat it as such. */ 00557 buf[len++] = entries; 00558 for (m = 0; m < entries; m++) { 00559 /* Make an XOR'ed entry the maximum length */ 00560 limit = (entry + m) & UDPTL_BUF_MASK; 00561 high_tide = 0; 00562 for (i = (limit - span*entries) & UDPTL_BUF_MASK; i != limit; i = (i + entries) & UDPTL_BUF_MASK) { 00563 if (high_tide < s->tx[i].buf_len) { 00564 for (j = 0; j < high_tide; j++) 00565 fec[j] ^= s->tx[i].buf[j]; 00566 for ( ; j < s->tx[i].buf_len; j++) 00567 fec[j] = s->tx[i].buf[j]; 00568 high_tide = s->tx[i].buf_len; 00569 } else { 00570 for (j = 0; j < s->tx[i].buf_len; j++) 00571 fec[j] ^= s->tx[i].buf[j]; 00572 } 00573 } 00574 if (encode_open_type(buf, &len, fec, high_tide) < 0) 00575 return -1; 00576 } 00577 break; 00578 } 00579 00580 if (s->verbose) 00581 fprintf(stderr, "\n"); 00582 00583 s->tx_seq_no++; 00584 return len; 00585 }
static int udptl_debug_test_addr | ( | struct sockaddr_in * | addr | ) | [inline, static] |
Definition at line 144 of file udptl.c.
Referenced by ast_udptl_read(), and ast_udptl_write().
00145 { 00146 if (udptldebug == 0) 00147 return 0; 00148 if (udptldebugaddr.sin_addr.s_addr) { 00149 if (((ntohs(udptldebugaddr.sin_port) != 0) 00150 && (udptldebugaddr.sin_port != addr->sin_port)) 00151 || (udptldebugaddr.sin_addr.s_addr != addr->sin_addr.s_addr)) 00152 return 0; 00153 } 00154 return 1; 00155 }
static int udptl_do_debug | ( | int | fd, | |
int | argc, | |||
char * | argv[] | |||
) | [static] |
Definition at line 1118 of file udptl.c.
References ast_cli(), RESULT_SHOWUSAGE, RESULT_SUCCESS, and udptl_do_debug_ip().
01119 { 01120 if (argc != 2) { 01121 if (argc != 4) 01122 return RESULT_SHOWUSAGE; 01123 return udptl_do_debug_ip(fd, argc, argv); 01124 } 01125 udptldebug = 1; 01126 memset(&udptldebugaddr,0,sizeof(udptldebugaddr)); 01127 ast_cli(fd, "UDPTL Debugging Enabled\n"); 01128 return RESULT_SUCCESS; 01129 }
static int udptl_do_debug_ip | ( | int | fd, | |
int | argc, | |||
char * | argv[] | |||
) | [static] |
Definition at line 1086 of file udptl.c.
References ahp, ast_cli(), ast_gethostbyname(), ast_inet_ntoa(), hp, RESULT_SHOWUSAGE, and RESULT_SUCCESS.
Referenced by udptl_do_debug().
01087 { 01088 struct hostent *hp; 01089 struct ast_hostent ahp; 01090 int port; 01091 char *p; 01092 char *arg; 01093 01094 port = 0; 01095 if (argc != 4) 01096 return RESULT_SHOWUSAGE; 01097 arg = argv[3]; 01098 p = strstr(arg, ":"); 01099 if (p) { 01100 *p = '\0'; 01101 p++; 01102 port = atoi(p); 01103 } 01104 hp = ast_gethostbyname(arg, &ahp); 01105 if (hp == NULL) 01106 return RESULT_SHOWUSAGE; 01107 udptldebugaddr.sin_family = AF_INET; 01108 memcpy(&udptldebugaddr.sin_addr, hp->h_addr, sizeof(udptldebugaddr.sin_addr)); 01109 udptldebugaddr.sin_port = htons(port); 01110 if (port == 0) 01111 ast_cli(fd, "UDPTL Debugging Enabled for IP: %s\n", ast_inet_ntoa(udptldebugaddr.sin_addr)); 01112 else 01113 ast_cli(fd, "UDPTL Debugging Enabled for IP: %s:%d\n", ast_inet_ntoa(udptldebugaddr.sin_addr), port); 01114 udptldebug = 1; 01115 return RESULT_SUCCESS; 01116 }
static int udptl_nodebug | ( | int | fd, | |
int | argc, | |||
char * | argv[] | |||
) | [static] |
Definition at line 1131 of file udptl.c.
References ast_cli(), RESULT_SHOWUSAGE, and RESULT_SUCCESS.
01132 { 01133 if (argc != 3) 01134 return RESULT_SHOWUSAGE; 01135 udptldebug = 0; 01136 ast_cli(fd,"UDPTL Debugging Disabled\n"); 01137 return RESULT_SUCCESS; 01138 }
static int udptl_rx_packet | ( | struct ast_udptl * | s, | |
uint8_t * | buf, | |||
int | len | |||
) | [static] |
Definition at line 268 of file udptl.c.
References AST_FRAME_MODEM, AST_LIST_NEXT, AST_MODEM_T38, decode_length(), decode_open_type(), and s.
Referenced by ast_udptl_read().
00269 { 00270 int stat; 00271 int stat2; 00272 int i; 00273 int j; 00274 int k; 00275 int l; 00276 int m; 00277 int x; 00278 int limit; 00279 int which; 00280 int ptr; 00281 int count; 00282 int total_count; 00283 int seq_no; 00284 const uint8_t *ifp; 00285 const uint8_t *data; 00286 int ifp_len; 00287 int repaired[16]; 00288 const uint8_t *bufs[16]; 00289 int lengths[16]; 00290 int span; 00291 int entries; 00292 int ifp_no; 00293 00294 ptr = 0; 00295 ifp_no = 0; 00296 memset(&s->f[0], 0, sizeof(s->f[0])); 00297 00298 /* Decode seq_number */ 00299 if (ptr + 2 > len) 00300 return -1; 00301 seq_no = (buf[0] << 8) | buf[1]; 00302 ptr += 2; 00303 00304 /* Break out the primary packet */ 00305 if ((stat = decode_open_type(buf, len, &ptr, &ifp, &ifp_len)) != 0) 00306 return -1; 00307 /* Decode error_recovery */ 00308 if (ptr + 1 > len) 00309 return -1; 00310 if ((buf[ptr++] & 0x80) == 0) { 00311 /* Secondary packet mode for error recovery */ 00312 if (seq_no > s->rx_seq_no) { 00313 /* We received a later packet than we expected, so we need to check if we can fill in the gap from the 00314 secondary packets. */ 00315 total_count = 0; 00316 do { 00317 if ((stat2 = decode_length(buf, len, &ptr, &count)) < 0) 00318 return -1; 00319 for (i = 0; i < count; i++) { 00320 if ((stat = decode_open_type(buf, len, &ptr, &bufs[total_count + i], &lengths[total_count + i])) != 0) 00321 return -1; 00322 } 00323 total_count += count; 00324 } 00325 while (stat2 > 0); 00326 /* Step through in reverse order, so we go oldest to newest */ 00327 for (i = total_count; i > 0; i--) { 00328 if (seq_no - i >= s->rx_seq_no) { 00329 /* This one wasn't seen before */ 00330 /* Decode the secondary IFP packet */ 00331 //fprintf(stderr, "Secondary %d, len %d\n", seq_no - i, lengths[i - 1]); 00332 s->f[ifp_no].frametype = AST_FRAME_MODEM; 00333 s->f[ifp_no].subclass = AST_MODEM_T38; 00334 00335 s->f[ifp_no].mallocd = 0; 00336 s->f[ifp_no].seqno = seq_no - i; 00337 s->f[ifp_no].datalen = lengths[i - 1]; 00338 s->f[ifp_no].data = (uint8_t *) bufs[i - 1]; 00339 s->f[ifp_no].offset = 0; 00340 s->f[ifp_no].src = "UDPTL"; 00341 if (ifp_no > 0) 00342 AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no]; 00343 AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL; 00344 ifp_no++; 00345 } 00346 } 00347 } 00348 } 00349 else 00350 { 00351 /* FEC mode for error recovery */ 00352 /* Our buffers cannot tolerate overlength IFP packets in FEC mode */ 00353 if (ifp_len > LOCAL_FAX_MAX_DATAGRAM) 00354 return -1; 00355 /* Update any missed slots in the buffer */ 00356 for ( ; seq_no > s->rx_seq_no; s->rx_seq_no++) { 00357 x = s->rx_seq_no & UDPTL_BUF_MASK; 00358 s->rx[x].buf_len = -1; 00359 s->rx[x].fec_len[0] = 0; 00360 s->rx[x].fec_span = 0; 00361 s->rx[x].fec_entries = 0; 00362 } 00363 00364 x = seq_no & UDPTL_BUF_MASK; 00365 00366 memset(repaired, 0, sizeof(repaired)); 00367 00368 /* Save the new IFP packet */ 00369 memcpy(s->rx[x].buf, ifp, ifp_len); 00370 s->rx[x].buf_len = ifp_len; 00371 repaired[x] = TRUE; 00372 00373 /* Decode the FEC packets */ 00374 /* The span is defined as an unconstrained integer, but will never be more 00375 than a small value. */ 00376 if (ptr + 2 > len) 00377 return -1; 00378 if (buf[ptr++] != 1) 00379 return -1; 00380 span = buf[ptr++]; 00381 s->rx[x].fec_span = span; 00382 00383 /* The number of entries is defined as a length, but will only ever be a small 00384 value. Treat it as such. */ 00385 if (ptr + 1 > len) 00386 return -1; 00387 entries = buf[ptr++]; 00388 s->rx[x].fec_entries = entries; 00389 00390 /* Decode the elements */ 00391 for (i = 0; i < entries; i++) { 00392 if ((stat = decode_open_type(buf, len, &ptr, &data, &s->rx[x].fec_len[i])) != 0) 00393 return -1; 00394 if (s->rx[x].fec_len[i] > LOCAL_FAX_MAX_DATAGRAM) 00395 return -1; 00396 00397 /* Save the new FEC data */ 00398 memcpy(s->rx[x].fec[i], data, s->rx[x].fec_len[i]); 00399 #if 0 00400 fprintf(stderr, "FEC: "); 00401 for (j = 0; j < s->rx[x].fec_len[i]; j++) 00402 fprintf(stderr, "%02X ", data[j]); 00403 fprintf(stderr, "\n"); 00404 #endif 00405 } 00406 00407 /* See if we can reconstruct anything which is missing */ 00408 /* TODO: this does not comprehensively hunt back and repair everything that is possible */ 00409 for (l = x; l != ((x - (16 - span*entries)) & UDPTL_BUF_MASK); l = (l - 1) & UDPTL_BUF_MASK) { 00410 if (s->rx[l].fec_len[0] <= 0) 00411 continue; 00412 for (m = 0; m < s->rx[l].fec_entries; m++) { 00413 limit = (l + m) & UDPTL_BUF_MASK; 00414 for (which = -1, k = (limit - s->rx[l].fec_span * s->rx[l].fec_entries) & UDPTL_BUF_MASK; k != limit; k = (k + s->rx[l].fec_entries) & UDPTL_BUF_MASK) { 00415 if (s->rx[k].buf_len <= 0) 00416 which = (which == -1) ? k : -2; 00417 } 00418 if (which >= 0) { 00419 /* Repairable */ 00420 for (j = 0; j < s->rx[l].fec_len[m]; j++) { 00421 s->rx[which].buf[j] = s->rx[l].fec[m][j]; 00422 for (k = (limit - s->rx[l].fec_span * s->rx[l].fec_entries) & UDPTL_BUF_MASK; k != limit; k = (k + s->rx[l].fec_entries) & UDPTL_BUF_MASK) 00423 s->rx[which].buf[j] ^= (s->rx[k].buf_len > j) ? s->rx[k].buf[j] : 0; 00424 } 00425 s->rx[which].buf_len = s->rx[l].fec_len[m]; 00426 repaired[which] = TRUE; 00427 } 00428 } 00429 } 00430 /* Now play any new packets forwards in time */ 00431 for (l = (x + 1) & UDPTL_BUF_MASK, j = seq_no - UDPTL_BUF_MASK; l != x; l = (l + 1) & UDPTL_BUF_MASK, j++) { 00432 if (repaired[l]) { 00433 //fprintf(stderr, "Fixed packet %d, len %d\n", j, l); 00434 s->f[ifp_no].frametype = AST_FRAME_MODEM; 00435 s->f[ifp_no].subclass = AST_MODEM_T38; 00436 00437 s->f[ifp_no].mallocd = 0; 00438 s->f[ifp_no].seqno = j; 00439 s->f[ifp_no].datalen = s->rx[l].buf_len; 00440 s->f[ifp_no].data = s->rx[l].buf; 00441 s->f[ifp_no].offset = 0; 00442 s->f[ifp_no].src = "UDPTL"; 00443 if (ifp_no > 0) 00444 AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no]; 00445 AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL; 00446 ifp_no++; 00447 } 00448 } 00449 } 00450 00451 /* If packets are received out of sequence, we may have already processed this packet from the error 00452 recovery information in a packet already received. */ 00453 if (seq_no >= s->rx_seq_no) { 00454 /* Decode the primary IFP packet */ 00455 s->f[ifp_no].frametype = AST_FRAME_MODEM; 00456 s->f[ifp_no].subclass = AST_MODEM_T38; 00457 00458 s->f[ifp_no].mallocd = 0; 00459 s->f[ifp_no].seqno = seq_no; 00460 s->f[ifp_no].datalen = ifp_len; 00461 s->f[ifp_no].data = (uint8_t *) ifp; 00462 s->f[ifp_no].offset = 0; 00463 s->f[ifp_no].src = "UDPTL"; 00464 if (ifp_no > 0) 00465 AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no]; 00466 AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL; 00467 00468 ifp_no++; 00469 } 00470 00471 s->rx_seq_no = seq_no + 1; 00472 return ifp_no; 00473 }
static int udptlread | ( | int * | id, | |
int | fd, | |||
short | events, | |||
void * | cbdata | |||
) | [static] |
Definition at line 607 of file udptl.c.
References ast_udptl_read(), ast_udptl::callback, and f.
Referenced by ast_udptl_new_with_bindaddr().
00608 { 00609 struct ast_udptl *udptl = cbdata; 00610 struct ast_frame *f; 00611 00612 if ((f = ast_udptl_read(udptl))) { 00613 if (udptl->callback) 00614 udptl->callback(udptl, f, udptl->data); 00615 } 00616 return 1; 00617 }
struct ast_cli_entry cli_udptl[] [static] |
struct ast_cli_entry cli_udptl_no_debug [static] |
Initial value:
{ { "udptl", "no", "debug", NULL }, udptl_nodebug, NULL, NULL }
char debug_usage[] [static] |
char nodebug_usage[] [static] |
struct ast_udptl_protocol* protos [static] |
Definition at line 139 of file udptl.c.
Referenced by ast_udptl_proto_register(), ast_udptl_proto_unregister(), and get_proto().
int udptldebug [static] |
struct sockaddr_in udptldebugaddr [static] |
int udptlfecentries [static] |
int udptlfecspan [static] |
int udptlfectype [static] |
int udptlmaxdatagram [static] |
int udptlstart [static] |