FreeCalypso > hg > themwi-system-sw

annotate mncc/mncc_recv.c @ 16:4c2000b3aed7

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top Makefile: add mncc
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 26 Jun 2022 16:33:30 -0800
parents ccc5ab6d8388
children 660126bd5f59
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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 static void
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17 report_runt(msg)
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18 union mncc_msg *msg;
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19 {
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20 syslog(LOG_CRIT, "MNCC message type 0x%x from GSM is too short!",
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21 msg->msg_type);
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22 }
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23
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24 static void
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25 handle_setup_ind(msg, msglen)
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26 struct gsm_mncc *msg;
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27 unsigned msglen;
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28 {
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29 struct gsm_call *call;
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30
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31 if (msglen < sizeof(struct gsm_mncc)) {
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32 report_runt(msg);
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33 return;
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34 }
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35 call = find_gsm_callref(msg->callref);
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36 if (call) {
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37 syslog(LOG_ERR, "duplicate MNCC_SETUP_IND for callref 0x%x",
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38 msg->callref);
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39 /* drop it like OsmoMSC's mncc_builtin does */
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40 return;
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41 }
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42 /* further processing */
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43 process_mo_call_setup(msg);
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44 }
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45
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46 static void
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47 handle_signaling_msg(msg, msglen)
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48 struct gsm_mncc *msg;
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49 unsigned msglen;
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50 {
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51 struct gsm_call *call;
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52
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53 if (msglen < sizeof(struct gsm_mncc)) {
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54 report_runt(msg);
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55 return;
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56 }
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57 call = find_gsm_callref(msg->callref);
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58 if (!call) {
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59 syslog(LOG_ERR,
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60 "MNCC message type 0x%x: callref 0x%x not found",
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61 msg->msg_type, msg->callref);
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62 /* drop it like OsmoMSC's mncc_builtin does */
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63 return;
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64 }
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65 if (msg->msg_type == MNCC_SETUP_CNF)
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66 preen_connected_number(msg);
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67 /* dispatch according to internal switch or socket */
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68 if (call->socket)
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69 mncc_signal_to_socket(call, msg);
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70 else
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71 internal_switch_mncc(call, msg);
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72 }
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73
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74 static void
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75 handle_release_msg(msg, msglen)
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76 struct gsm_mncc *msg;
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77 unsigned msglen;
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78 {
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79 struct gsm_call *call;
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80
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81 if (msglen < sizeof(struct gsm_mncc)) {
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82 report_runt(msg);
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83 return;
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84 }
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85 call = find_gsm_callref(msg->callref);
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86 if (!call) {
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87 syslog(LOG_ERR,
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88 "MNCC message type 0x%x: callref 0x%x not found",
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89 msg->msg_type, msg->callref);
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90 /* drop it like OsmoMSC's mncc_builtin does */
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91 return;
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92 }
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93 /* dispatch according to internal switch or socket */
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94 if (call->socket) {
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95 mncc_signal_to_socket(call, msg);
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96 extsock_dec_refcount(call->socket);
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97 call->gc_flag = 1;
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98 } else
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99 internal_switch_mncc(call, msg);
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100 }
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101
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102 static void
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103 handle_rtp_msg(msg, msglen)
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104 struct gsm_mncc_rtp *msg;
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105 unsigned msglen;
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106 {
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107 struct gsm_call *call;
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108
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109 if (msglen < sizeof(struct gsm_mncc_rtp)) {
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110 report_runt(msg);
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111 return;
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112 }
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113 call = find_gsm_callref(msg->callref);
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114 if (!call) {
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115 syslog(LOG_ERR,
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116 "MNCC message type 0x%x: callref 0x%x not found",
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117 msg->msg_type, msg->callref);
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118 /* drop it like OsmoMSC's mncc_builtin does */
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119 return;
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120 }
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121 /* only for socket connections - no RTP handling for internal */
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122 if (call->socket)
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123 mncc_rtp_to_socket(call, msg);
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124 }
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125
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126 static void
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127 handle_mncc_hello(msg, msglen)
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128 struct gsm_mncc_hello *msg;
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129 unsigned msglen;
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130 {
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131 if (msglen < sizeof(struct gsm_mncc_hello)) {
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132 syslog(LOG_CRIT, "MNCC_SOCKET_HELLO message is too short!");
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133 exit(1);
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134 }
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135 if (msg->version != MNCC_SOCK_VERSION) {
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136 syslog(LOG_CRIT, "MNCC hello error: version number mismatch");
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137 exit(1);
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138 }
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139 if (msg->mncc_size != sizeof(struct gsm_mncc)) {
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140 syslog(LOG_CRIT, "MNCC hello error: mncc_size mismatch");
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141 exit(1);
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142 }
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143 }
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144
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145 void
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146 mncc_msg_from_gsm(msg, msglen)
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147 union mncc_msg *msg;
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148 unsigned msglen;
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149 {
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150 switch (msg->msg_type) {
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151 case MNCC_SETUP_IND:
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152 handle_setup_ind(msg, msglen);
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153 return;
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154 case MNCC_SETUP_CNF:
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155 case MNCC_SETUP_COMPL_IND:
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156 case MNCC_CALL_CONF_IND:
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157 case MNCC_ALERT_IND:
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158 case MNCC_NOTIFY_IND:
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159 case MNCC_DISC_IND:
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160 case MNCC_FACILITY_IND:
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161 case MNCC_START_DTMF_IND:
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162 case MNCC_STOP_DTMF_IND:
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163 case MNCC_MODIFY_IND:
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164 case MNCC_MODIFY_CNF:
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165 case MNCC_MODIFY_REJ:
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166 case MNCC_HOLD_IND:
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167 case MNCC_RETRIEVE_IND:
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168 case MNCC_USERINFO_IND:
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169 handle_signaling_msg(msg, msglen);
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170 return;
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171 case MNCC_REL_IND:
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172 case MNCC_REL_CNF:
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173 case MNCC_REJ_IND:
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174 handle_release_msg(msg, msglen);
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175 return;
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176 case MNCC_RTP_CREATE:
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177 case MNCC_RTP_CONNECT:
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178 case MNCC_RTP_FREE:
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179 handle_rtp_msg(msg, msglen);
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180 return;
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181 case MNCC_SOCKET_HELLO:
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182 handle_mncc_hello(msg, msglen);
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183 return;
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184 default:
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185 syslog(LOG_CRIT, "unknown MNCC message type 0x%x from GSM",
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186 msg->msg_type);
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187 }
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188 }