FreeCalypso > hg > themwi-system-sw

annotate mncc/mncc_recv.c @ 101:ca21fbf9d2ea

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mgw: implement G.711 encoding
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Sep 2022 15:21:05 -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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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);
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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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parents:
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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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parents:
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186 case MNCC_RTP_CREATE:
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parents:
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187 case MNCC_RTP_CONNECT:
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parents:
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188 case MNCC_RTP_FREE:
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189 handle_rtp_msg(msg, msglen);
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parents:
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190 return;
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parents:
diff changeset
191 case MNCC_SOCKET_HELLO:
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parents:
diff changeset
192 handle_mncc_hello(msg, msglen);
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parents:
diff changeset
193 return;
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parents:
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194 default:
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parents:
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195 syslog(LOG_CRIT, "unknown MNCC message type 0x%x from GSM",
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parents:
diff changeset
196 msg->msg_type);
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parents:
diff changeset
197 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
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parents:
diff changeset
198 }