FreeCalypso > hg > themwi-system-sw

annotate mncc/mncc_recv.c @ 124:7e04d28fae8b

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sip-in: default use-100rel to no BulkVS servers act badly when we send a reliable 180 Ringing response to an incoming call, even though they advertise 100rel support in the Supported header in the INVITE packet, and we probably won't be implementing 100rel for outbound because doing per-the-spec PRACK as a UAC is just too burdensome. Therefore, we need to consider 100rel extension as not-really-supported in themwi-system-sw.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 01 Oct 2022 15:54:50 -0800
parents 660126bd5f59
children
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1 /*
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2 * In this module we implement initial handling of MNCC messages
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3 * coming from OsmoMSC, dispatching them further as appropriate.
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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 <stdio.h>
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9 #include <stdint.h>
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10 #include <stdlib.h>
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11 #include <syslog.h>
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12 #include "../include/mncc.h"
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13 #include "struct.h"
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14 #include "gsm_call.h"
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15
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16 extern char *mncc_msg_name();
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17
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18 static void
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19 report_runt(msg)
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20 union mncc_msg *msg;
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21 {
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22 syslog(LOG_CRIT, "MNCC message type 0x%x from GSM is too short!",
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23 msg->msg_type);
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24 }
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25
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26 static void
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27 handle_setup_ind(msg, msglen)
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28 struct gsm_mncc *msg;
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29 unsigned msglen;
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30 {
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31 struct gsm_call *call;
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32
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33 if (msglen < sizeof(struct gsm_mncc)) {
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34 report_runt(msg);
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35 return;
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36 }
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37 syslog(LOG_DEBUG, "Rx MNCC_SETUP_IND from GSM, callref=0x%x",
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38 msg->callref);
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39 call = find_gsm_callref(msg->callref);
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40 if (call) {
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41 syslog(LOG_ERR, "duplicate MNCC_SETUP_IND for callref 0x%x",
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42 msg->callref);
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43 /* drop it like OsmoMSC's mncc_builtin does */
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44 return;
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45 }
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46 /* further processing */
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47 process_mo_call_setup(msg);
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48 }
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49
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50 static void
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51 handle_signaling_msg(msg, msglen)
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52 struct gsm_mncc *msg;
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53 unsigned msglen;
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54 {
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55 struct gsm_call *call;
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56
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57 if (msglen < sizeof(struct gsm_mncc)) {
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58 report_runt(msg);
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59 return;
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60 }
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61 syslog(LOG_DEBUG, "Rx %s from GSM, callref=0x%x",
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62 mncc_msg_name(msg->msg_type), msg->callref);
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63 call = find_gsm_callref(msg->callref);
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64 if (!call) {
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65 syslog(LOG_ERR, "%s from GSM: callref 0x%x not found",
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66 mncc_msg_name(msg->msg_type), msg->callref);
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67 /* drop it like OsmoMSC's mncc_builtin does */
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68 return;
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69 }
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70 if (msg->msg_type == MNCC_SETUP_CNF)
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71 preen_connected_number(msg);
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72 /* dispatch according to internal switch or socket */
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73 if (call->socket)
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74 mncc_signal_to_socket(call, msg);
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75 else
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76 internal_switch_mncc(call, msg);
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77 }
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78
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79 static void
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80 handle_release_msg(msg, msglen)
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81 struct gsm_mncc *msg;
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82 unsigned msglen;
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83 {
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84 struct gsm_call *call;
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85
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86 if (msglen < sizeof(struct gsm_mncc)) {
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87 report_runt(msg);
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88 return;
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89 }
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90 syslog(LOG_DEBUG, "Rx %s from GSM, callref=0x%x",
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91 mncc_msg_name(msg->msg_type), msg->callref);
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92 call = find_gsm_callref(msg->callref);
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93 if (!call) {
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94 syslog(LOG_ERR, "%s from GSM: callref 0x%x not found",
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95 mncc_msg_name(msg->msg_type), msg->callref);
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96 /* drop it like OsmoMSC's mncc_builtin does */
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97 return;
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98 }
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99 /* dispatch according to internal switch or socket */
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100 if (call->socket) {
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101 mncc_signal_to_socket(call, msg);
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102 syslog(LOG_DEBUG,
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103 "clearing socket call: GSM callref 0x%x, socket ref 0x%x",
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104 call->callref, call->socket_ref);
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105 extsock_dec_refcount(call->socket);
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106 call->gc_flag = 1;
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107 } else
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108 internal_switch_mncc(call, msg);
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109 }
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110
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111 static void
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112 handle_rtp_msg(msg, msglen)
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113 struct gsm_mncc_rtp *msg;
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114 unsigned msglen;
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115 {
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116 struct gsm_call *call;
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117
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118 if (msglen < sizeof(struct gsm_mncc_rtp)) {
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119 report_runt(msg);
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120 return;
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121 }
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122 syslog(LOG_DEBUG, "Rx %s from GSM, callref=0x%x",
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123 mncc_msg_name(msg->msg_type), msg->callref);
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124 call = find_gsm_callref(msg->callref);
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125 if (!call) {
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126 syslog(LOG_ERR, "%s from GSM: callref 0x%x not found",
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127 mncc_msg_name(msg->msg_type), msg->callref);
15
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128 /* drop it like OsmoMSC's mncc_builtin does */
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129 return;
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130 }
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131 /* only for socket connections - no RTP handling for internal */
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132 if (call->socket)
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133 mncc_rtp_to_socket(call, msg);
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134 }
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135
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136 static void
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137 handle_mncc_hello(msg, msglen)
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138 struct gsm_mncc_hello *msg;
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139 unsigned msglen;
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140 {
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141 if (msglen < sizeof(struct gsm_mncc_hello)) {
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142 syslog(LOG_CRIT, "MNCC_SOCKET_HELLO message is too short!");
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143 exit(1);
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144 }
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145 if (msg->version != MNCC_SOCK_VERSION) {
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146 syslog(LOG_CRIT, "MNCC hello error: version number mismatch");
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147 exit(1);
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148 }
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149 if (msg->mncc_size != sizeof(struct gsm_mncc)) {
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150 syslog(LOG_CRIT, "MNCC hello error: mncc_size mismatch");
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151 exit(1);
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152 }
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153 }
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154
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155 void
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156 mncc_msg_from_gsm(msg, msglen)
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157 union mncc_msg *msg;
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158 unsigned msglen;
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159 {
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160 switch (msg->msg_type) {
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161 case MNCC_SETUP_IND:
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162 handle_setup_ind(msg, msglen);
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163 return;
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164 case MNCC_SETUP_CNF:
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165 case MNCC_SETUP_COMPL_IND:
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166 case MNCC_CALL_CONF_IND:
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167 case MNCC_ALERT_IND:
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168 case MNCC_NOTIFY_IND:
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169 case MNCC_DISC_IND:
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170 case MNCC_FACILITY_IND:
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171 case MNCC_START_DTMF_IND:
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172 case MNCC_STOP_DTMF_IND:
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173 case MNCC_MODIFY_IND:
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174 case MNCC_MODIFY_CNF:
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175 case MNCC_MODIFY_REJ:
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176 case MNCC_HOLD_IND:
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177 case MNCC_RETRIEVE_IND:
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178 case MNCC_USERINFO_IND:
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179 handle_signaling_msg(msg, msglen);
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180 return;
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181 case MNCC_REL_IND:
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182 case MNCC_REL_CNF:
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183 case MNCC_REJ_IND:
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184 handle_release_msg(msg, msglen);
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185 return;
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186 case MNCC_RTP_CREATE:
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187 case MNCC_RTP_CONNECT:
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188 case MNCC_RTP_FREE:
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189 handle_rtp_msg(msg, msglen);
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190 return;
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191 case MNCC_SOCKET_HELLO:
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192 handle_mncc_hello(msg, msglen);
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193 return;
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194 default:
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195 syslog(LOG_CRIT, "unknown MNCC message type 0x%x from GSM",
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196 msg->msg_type);
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197 }
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198 }