FreeCalypso > hg > themwi-system-sw

annotate mgw/gsm2pstn.c @ 158:51cf5ea7f320

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sip-out: map INVITE errors to GSM cause values
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 12 Oct 2022 08:45:39 -0800
parents f062c32a5116
children 8c28426abef0
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Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * In this module we implement our RTP gateway function
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3 * in the GSM to PSTN direction.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/socket.h>
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8 #include <sys/time.h>
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9 #include <netinet/in.h>
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10 #include <stdio.h>
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11 #include <stdint.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14 #include <strings.h>
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15 #include <syslog.h>
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16 #include <unistd.h>
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17 #include <gsm.h> /* libgsm dependency */
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18 #include "../include/tmgw_ctrl.h"
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19 #include "../include/tmgw_const.h"
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20 #include "struct.h"
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21 #include "select.h"
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22 #include "int_defs.h"
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23
127
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24 extern struct timeval cur_event_time;
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25
103
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26 #define ERR_WRONG_UDP_SRC 0x0001
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27 #define ERR_BAD_RTP_PACKET 0x0002
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28 #define ERR_SSRC_CHANGE 0x0004
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29 #define ERR_SEQ_BREAK 0x0008
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30 #define ERR_TSTAMP_BREAK 0x0010
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31
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32 void
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33 gsm2pstn_rtp_in(in_fd, ep)
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34 struct endpoint *ep;
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35 {
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36 struct rtp_packet pkt;
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37 struct sockaddr_in sin_from;
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38 socklen_t addrlen;
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39 int16_t seq_delta;
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40 int32_t ts_delta;
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41 int16_t pcm_samples[SAMPLES_PER_FRAME];
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42 int rc, m_out;
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43
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44 addrlen = sizeof(struct sockaddr_in);
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45 rc = recvfrom(in_fd, &pkt, sizeof pkt, 0,
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46 (struct sockaddr *) &sin_from, &addrlen);
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47 if (rc < 0)
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48 return;
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49 if (sin_from.sin_addr.s_addr != ep->rtp_gsm.remote_addr.sin_addr.s_addr
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50 || sin_from.sin_port != ep->rtp_gsm.remote_addr.sin_port) {
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51 if (!(ep->g2p_err_flags & ERR_WRONG_UDP_SRC)) {
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52 syslog(LOG_ERR,
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53 "GSM RTP ep got UDP packet from wrong source");
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54 ep->g2p_err_flags |= ERR_WRONG_UDP_SRC;
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55 }
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56 return;
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57 }
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58 if (rc != ep->gsm_rtp_pkt_size) {
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59 bad_rtp_pkt: if (!(ep->g2p_err_flags & ERR_BAD_RTP_PACKET)) {
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60 syslog(LOG_ERR, "Rx bad RTP packet on GSM side");
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61 ep->g2p_err_flags |= ERR_BAD_RTP_PACKET;
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62 }
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63 return;
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64 }
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65 if (pkt.v_p_x_cc != 0x80)
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66 goto bad_rtp_pkt;
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67 if ((pkt.m_pt & 0x7F) != ep->gsm_payload_type)
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68 goto bad_rtp_pkt;
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69 if ((pkt.payload[0] & 0xF0) != ep->gsm_payload_magic)
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70 goto bad_rtp_pkt;
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71 if (ep->g2p_state && pkt.ssrc != ep->g2p_ssrc) {
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72 if (!(ep->g2p_err_flags & ERR_SSRC_CHANGE)) {
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73 syslog(LOG_ERR, "GSM RTP stream changed SSRC");
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74 ep->g2p_err_flags |= ERR_SSRC_CHANGE;
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75 }
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76 ep->g2p_state = 0;
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77 if (ep->dtmf_pp)
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78 dtmf_stop_immediate(ep);
103
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79 }
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80 if (ep->g2p_state) {
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81 seq_delta = ntohs(pkt.seq) - ep->g2p_last_seq;
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82 ts_delta = ntohl(pkt.tstamp) - ep->g2p_last_ts;
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83 if (seq_delta <= 0)
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84 return; /* discard old or duplicate */
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85 if (seq_delta != 1) {
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86 if (!(ep->g2p_err_flags & ERR_SEQ_BREAK)) {
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87 syslog(LOG_ERR, "GSM RTP stream seq break");
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88 ep->g2p_err_flags |= ERR_SEQ_BREAK;
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89 }
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90 m_out = 1;
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91 } else {
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92 if (ts_delta == SAMPLES_PER_FRAME)
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93 m_out = 0;
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94 else if (ts_delta > 0 &&
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95 ts_delta % SAMPLES_PER_FRAME == 0)
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96 m_out = 1;
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97 else {
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98 if (!(ep->g2p_err_flags & ERR_TSTAMP_BREAK)) {
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99 syslog(LOG_ERR,
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100 "GSM RTP stream tstamp break");
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101 ep->g2p_err_flags |= ERR_TSTAMP_BREAK;
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102 }
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103 m_out = 1;
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104 }
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105 }
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106 } else
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107 m_out = 1;
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108 ep->g2p_state = 1;
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109 ep->g2p_ssrc = pkt.ssrc;
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110 ep->g2p_last_ts = ntohl(pkt.tstamp);
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111 ep->g2p_last_seq = ntohs(pkt.seq);
127
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112 ep->g2p_local_time = cur_event_time;
103
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113 /* actual transcoding and forwarding */
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114 if (!(ep->fwd_mode & TMGW_FWD_ENABLE_GSM2PSTN)) {
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115 ep->g2p_drop_flag = 1;
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116 return;
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117 }
127
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118 if (ep->dtmf_pp)
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119 return;
103
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120 if (ep->g2p_drop_flag) {
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121 ep->g2p_drop_flag = 0;
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122 m_out = 1;
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123 }
127
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124 if (ep->dtmf_aftermath) {
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125 ts_delta = ep->g2p_last_ts - ep->dtmf_last_ts;
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parents: 103
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126 if (ts_delta <= 0)
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127 return;
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Mychaela Falconia <falcon@freecalypso.org>
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128 ep->dtmf_aftermath = 0;
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diff changeset
129 if (ts_delta == SAMPLES_PER_FRAME)
f062c32a5116 mgw: implement DTMF
Mychaela Falconia <falcon@freecalypso.org>
parents: 103
diff changeset
130 m_out = 0;
f062c32a5116 mgw: implement DTMF
Mychaela Falconia <falcon@freecalypso.org>
parents: 103
diff changeset
131 else
f062c32a5116 mgw: implement DTMF
Mychaela Falconia <falcon@freecalypso.org>
parents: 103
diff changeset
132 m_out = 1;
f062c32a5116 mgw: implement DTMF
Mychaela Falconia <falcon@freecalypso.org>
parents: 103
diff changeset
133 }
103
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 switch (ep->gsm_payload_msg_type) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 case GSM_TCHF_FRAME:
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 gsm_decode(ep->gsm_decoder_state, pkt.payload, pcm_samples);
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 break;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 }
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 pkt.m_pt = ep->pstn_payload_type;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 if (m_out)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 pkt.m_pt |= 0x80;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 pkt.seq = htons(++ep->g2p_out_seq);
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 g711_encode_frame(pcm_samples, pkt.payload, ep->pstn_payload_type);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 addrlen = sizeof(struct sockaddr_in);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 sendto(ep->rtp_pstn.rtp_fd, &pkt, RTP_PACKET_SIZE_PSTN, 0,
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 (struct sockaddr *) &ep->rtp_pstn.remote_addr, addrlen);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 gsm2pstn_init(ep)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 struct endpoint *ep;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 {
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 if (ep->gsm_decoder_state)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 return TMGW_RESP_OK;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 switch (ep->gsm_payload_msg_type) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 case GSM_TCHF_FRAME:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 ep->gsm_decoder_state = gsm_create();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 if (!ep->gsm_decoder_state)
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 return TMGW_RESP_ERR_RSRC;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 break;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 }
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 select_handlers[ep->rtp_gsm.rtp_fd] = gsm2pstn_rtp_in;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 return TMGW_RESP_OK;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 }