FreeCalypso > hg > themwi-system-sw
annotate mncc/extsock.c @ 123:a36b731bfef9
sip-manual-out: implement sending BYE and CANCEL
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 29 Sep 2022 17:21:11 -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 } |