FreeCalypso > hg > themwi-system-sw
annotate mncc/extsock.c @ 124:7e04d28fae8b
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> |
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date | Sat, 01 Oct 2022 15:54:50 -0800 |
parents | 660126bd5f59 |
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rev | line source |
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1 /* |
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2 * In this module we gather functions that deal with external |
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3 * socket connections, both externally-originating MT calls |
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4 * and outbound MO calls. |
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5 */ |
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6 |
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7 #include <sys/types.h> |
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8 #include <sys/socket.h> |
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9 #include <stdio.h> |
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10 #include <stdint.h> |
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11 #include <stdlib.h> |
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12 #include <string.h> |
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13 #include <strings.h> |
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14 #include <syslog.h> |
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15 #include "../include/mncc.h" |
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16 #include "../include/gsm48_const.h" |
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17 #include "struct.h" |
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18 #include "gsm_call.h" |
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19 |
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20 extern char *mncc_msg_name(); |
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21 |
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22 void |
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23 extsock_dec_refcount(conn) |
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24 struct socket_conn *conn; |
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25 { |
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26 if (!conn->ncalls) { |
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27 syslog(LOG_CRIT, "FATAL BUG: ncalls=0 on socket call clearing"); |
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28 exit(1); |
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29 } |
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30 conn->ncalls--; |
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31 } |
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32 |
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33 static void |
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34 send_rel_on_broken_socket(call) |
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35 struct gsm_call *call; |
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36 { |
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37 struct gsm_mncc msg; |
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38 |
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39 bzero(&msg, sizeof(struct gsm_mncc)); |
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40 msg.msg_type = MNCC_REL_REQ; |
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41 msg.callref = call->callref; |
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42 mncc_set_cause(&msg, GSM48_CAUSE_LOC_PRN_S_LU, GSM48_CC_CAUSE_DEST_OOO); |
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43 send_mncc_to_gsm(&msg, sizeof(struct gsm_mncc)); |
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44 } |
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45 |
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46 static void |
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47 broken_socket_clear_calls(conn) |
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48 struct socket_conn *conn; |
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49 { |
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50 extern struct gsm_call *call_list_head; |
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51 struct gsm_call *call; |
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52 |
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53 for (call = call_list_head; call; call = call->next) { |
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54 if (call->gc_flag) |
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55 continue; |
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56 if (call->socket == conn) { |
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57 syslog(LOG_WARNING, |
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58 "clearing broken socket call: GSM callref 0x%x, socket ref 0x%x", |
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59 call->callref, call->socket_ref); |
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60 send_rel_on_broken_socket(call); |
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61 extsock_dec_refcount(conn); |
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62 call->gc_flag = 1; |
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63 } |
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64 } |
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65 if (conn->ncalls) { |
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66 syslog(LOG_CRIT, |
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67 "FATAL BUG: ncalls!=0 after broken socket call clearing"); |
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68 exit(1); |
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69 } |
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70 } |
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71 |
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72 static void |
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73 report_runt(msg) |
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74 union mncc_msg *msg; |
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75 { |
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76 syslog(LOG_CRIT, |
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77 "MNCC message type 0x%x from ThemWi call socket is too short!", |
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78 msg->msg_type); |
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79 } |
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80 |
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81 static void |
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82 handle_setup_req(conn, msg, msglen) |
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83 struct socket_conn *conn; |
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84 struct gsm_mncc *msg; |
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85 unsigned msglen; |
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86 { |
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87 struct gsm_call *call; |
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88 |
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89 if (msglen < sizeof(struct gsm_mncc)) { |
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90 report_runt(msg); |
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91 return; |
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92 } |
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93 syslog(LOG_DEBUG, "Rx MNCC_SETUP_REQ from socket, callref=0x%x", |
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94 msg->callref); |
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95 call = find_socket_call(conn, msg->callref); |
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96 if (call) { |
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97 syslog(LOG_ERR, |
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98 "duplicate MNCC_SETUP_REQ from socket for callref 0x%x", |
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99 msg->callref); |
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100 /* drop it like OsmoMSC's mncc_builtin does */ |
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101 return; |
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102 } |
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103 /* further processing */ |
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104 process_ext_mtcall_setup(conn, msg); |
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105 } |
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106 |
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107 static void |
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108 handle_signaling_msg(conn, msg, msglen) |
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109 struct socket_conn *conn; |
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110 struct gsm_mncc *msg; |
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111 unsigned msglen; |
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112 { |
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113 struct gsm_call *call; |
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114 |
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115 if (msglen < sizeof(struct gsm_mncc)) { |
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116 report_runt(msg); |
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117 return; |
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118 } |
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119 syslog(LOG_DEBUG, "Rx %s from socket, callref=0x%x", |
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120 mncc_msg_name(msg->msg_type), msg->callref); |
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121 call = find_socket_call(conn, msg->callref); |
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122 if (!call) { |
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123 syslog(LOG_ERR, |
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124 "MNCC message from ThemWi call socket: callref 0x%x not found", |
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125 msg->callref); |
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126 /* drop it like OsmoMSC's mncc_builtin does */ |
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127 return; |
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128 } |
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129 /* forward to GSM MNCC interface */ |
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130 msg->callref = call->callref; |
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131 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc)); |
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132 if (msg->msg_type == MNCC_REJ_REQ) { |
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133 extsock_dec_refcount(conn); |
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134 call->gc_flag = 1; |
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135 } |
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136 } |
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137 |
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138 static void |
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139 handle_rtp_msg(conn, msg, msglen) |
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140 struct socket_conn *conn; |
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141 struct gsm_mncc_rtp *msg; |
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142 unsigned msglen; |
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143 { |
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144 struct gsm_call *call; |
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145 |
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146 if (msglen < sizeof(struct gsm_mncc_rtp)) { |
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147 report_runt(msg); |
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148 return; |
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149 } |
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150 syslog(LOG_DEBUG, "Rx %s from socket, callref=0x%x", |
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151 mncc_msg_name(msg->msg_type), msg->callref); |
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152 call = find_socket_call(conn, msg->callref); |
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153 if (!call) { |
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154 syslog(LOG_ERR, |
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155 "MNCC message from ThemWi call socket: callref 0x%x not found", |
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156 msg->callref); |
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157 /* drop it like OsmoMSC's mncc_builtin does */ |
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158 return; |
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159 } |
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160 /* forward to GSM MNCC interface */ |
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161 msg->callref = call->callref; |
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162 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc_rtp)); |
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163 } |
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164 |
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165 void |
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166 extsock_read_select(conn) |
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167 struct socket_conn *conn; |
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168 { |
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169 union mncc_msg msg; |
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170 int rc; |
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171 |
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172 rc = recv(conn->fd, &msg, sizeof msg, 0); |
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173 if (rc < 4) { |
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174 if (conn->ncalls) { |
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175 syslog(LOG_ERR, "ext socket broken with calls present"); |
15
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176 broken_socket_clear_calls(conn); |
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177 } else |
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178 syslog(LOG_INFO, "normal closing of ext socket"); |
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179 close(conn->fd); |
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180 conn->fd = -1; |
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181 return; |
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182 } |
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183 switch (msg.msg_type) { |
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184 case MNCC_SETUP_REQ: |
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185 handle_setup_req(conn, &msg, rc); |
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186 return; |
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187 case MNCC_SETUP_RSP: |
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188 case MNCC_SETUP_COMPL_REQ: |
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189 case MNCC_CALL_PROC_REQ: |
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190 case MNCC_PROGRESS_REQ: |
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191 case MNCC_ALERT_REQ: |
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192 case MNCC_NOTIFY_REQ: |
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193 case MNCC_DISC_REQ: |
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194 case MNCC_REL_REQ: |
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195 case MNCC_FACILITY_REQ: |
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196 case MNCC_START_DTMF_RSP: |
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197 case MNCC_START_DTMF_REJ: |
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198 case MNCC_STOP_DTMF_RSP: |
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199 case MNCC_MODIFY_REQ: |
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200 case MNCC_MODIFY_RSP: |
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201 case MNCC_MODIFY_REJ: |
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202 case MNCC_HOLD_CNF: |
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203 case MNCC_HOLD_REJ: |
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204 case MNCC_RETRIEVE_CNF: |
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205 case MNCC_RETRIEVE_REJ: |
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206 case MNCC_USERINFO_REQ: |
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207 case MNCC_REJ_REQ: |
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208 handle_signaling_msg(conn, &msg, rc); |
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209 return; |
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210 case MNCC_RTP_CREATE: |
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211 case MNCC_RTP_CONNECT: |
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212 case MNCC_RTP_FREE: |
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213 handle_rtp_msg(conn, &msg, rc); |
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214 return; |
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215 default: |
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216 syslog(LOG_CRIT, |
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217 "unknown MNCC message type 0x%x from ThemWi call socket", |
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218 msg.msg_type); |
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219 } |
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220 } |
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221 |
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222 mncc_signal_to_socket(call, msg) |
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223 struct gsm_call *call; |
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224 struct gsm_mncc *msg; |
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225 { |
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226 msg->callref = call->socket_ref; |
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227 return send(call->socket->fd, msg, sizeof(struct gsm_mncc), 0); |
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228 } |
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229 |
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230 mncc_signal_to_socket_nocall(conn, msg) |
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231 struct socket_conn *conn; |
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232 struct gsm_mncc *msg; |
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233 { |
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234 return send(conn->fd, msg, sizeof(struct gsm_mncc), 0); |
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235 } |
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236 |
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237 mncc_rtp_to_socket(call, msg) |
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238 struct gsm_call *call; |
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239 struct gsm_mncc_rtp *msg; |
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240 { |
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241 msg->callref = call->socket_ref; |
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242 return send(call->socket->fd, msg, sizeof(struct gsm_mncc_rtp), 0); |
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243 } |