FreeCalypso > hg > themwi-system-sw
annotate sip-out/uac_out.c @ 178:b259e2722485
README: update for current status
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 09 Mar 2023 13:08:31 -0800 |
parents | e54b0a9e322f |
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rev | line source |
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1 /* |
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2 * In this module we implement generation of outgoing SIP messages |
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3 * in the UAC role. |
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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 <sys/time.h> |
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9 #include <netinet/in.h> |
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10 #include <stdio.h> |
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11 #include <stdint.h> |
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12 #include <stdlib.h> |
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13 #include <string.h> |
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14 #include <strings.h> |
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15 #include <syslog.h> |
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16 #include "../include/gsm48_const.h" |
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17 #include "../include/out_routes.h" |
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18 #include "../libsip/out_msg.h" |
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19 #include "../libsip/sdp.h" |
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20 #include "call.h" |
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21 |
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22 extern struct call *find_call_by_sip_id(); |
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23 |
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24 extern struct in_addr sip_bind_ip; |
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25 extern unsigned sip_bind_port; |
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26 extern unsigned max_forwards; |
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27 extern struct timeval cur_event_time; |
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28 |
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29 add_req_boilerplate(msg, call, cseq, to_tag) |
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30 struct sip_msg_out *msg; |
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31 struct call *call; |
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32 char *cseq, *to_tag; |
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33 { |
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34 char strbuf[256]; |
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35 int rc; |
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36 |
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37 sprintf(strbuf, "SIP/2.0/UDP %s:%u", |
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38 inet_ntoa(sip_bind_ip), sip_bind_port); |
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39 rc = out_msg_add_header(msg, "Via", strbuf); |
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40 if (rc < 0) |
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41 return rc; |
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42 rc = out_msg_add_header(msg, "From", call->from_header); |
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43 if (rc < 0) |
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44 return rc; |
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45 if (to_tag && to_tag[0]) { |
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46 sprintf(strbuf, "<%s>;tag=%s", call->to_uri, to_tag); |
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47 rc = out_msg_add_header(msg, "To", strbuf); |
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48 } else |
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49 rc = out_msg_add_header(msg, "To", call->to_uri); |
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50 if (rc < 0) |
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51 return rc; |
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52 rc = out_msg_add_header(msg, "Call-ID", call->sip_call_id); |
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53 if (rc < 0) |
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54 return rc; |
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55 rc = out_msg_add_header(msg, "CSeq", cseq); |
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56 if (rc < 0) |
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57 return rc; |
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58 sprintf(strbuf, "%u", max_forwards); |
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59 return out_msg_add_header(msg, "Max-Forwards", strbuf); |
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60 } |
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61 |
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62 add_contact_header(msg) |
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63 struct sip_msg_out *msg; |
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64 { |
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65 char strbuf[80]; |
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66 |
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67 sprintf(strbuf, "<sip:%s:%u;transport=udp>", |
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68 inet_ntoa(sip_bind_ip), sip_bind_port); |
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69 return out_msg_add_header(msg, "Contact", strbuf); |
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70 } |
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71 |
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72 fill_invite_req_msg(msg, call) |
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73 struct sip_msg_out *msg; |
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74 struct call *call; |
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75 { |
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76 struct sdp_gen sdp; |
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77 int rc; |
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78 |
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79 rc = start_request_out_msg(msg, "INVITE", call->to_uri); |
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80 if (rc < 0) |
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81 return rc; |
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82 rc = add_req_boilerplate(msg, call, "1 INVITE", (char *) 0); |
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83 if (rc < 0) |
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84 return rc; |
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85 rc = add_contact_header(msg); |
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86 if (rc < 0) |
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87 return rc; |
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88 rc = out_msg_add_header(msg, "Content-Type", "application/sdp"); |
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89 if (rc < 0) |
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90 return rc; |
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91 bzero(&sdp, sizeof sdp); |
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92 sdp.conn_ip = call->pstn_rtp_local.sin_addr; |
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93 sdp.conn_port = ntohs(call->pstn_rtp_local.sin_port); |
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94 sdp.codec_mask = SDP_CODEC_MASK_BOTH; |
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95 sdp.session_id = sdp.conn_port << 16; |
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96 sdp.owner_ip = sip_bind_ip; |
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97 return out_msg_finish_sdp(msg, &sdp); |
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98 } |
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99 |
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100 fill_cancel_req_msg(msg, call) |
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101 struct sip_msg_out *msg; |
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102 struct call *call; |
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103 { |
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104 int rc; |
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105 |
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106 rc = start_request_out_msg(msg, "CANCEL", call->to_uri); |
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107 if (rc < 0) |
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108 return rc; |
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109 rc = add_req_boilerplate(msg, call, "1 CANCEL", (char *) 0); |
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110 if (rc < 0) |
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111 return rc; |
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112 out_msg_finish(msg); |
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113 return 0; |
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114 } |
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115 |
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116 fill_bye_req_msg(msg, call) |
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117 struct sip_msg_out *msg; |
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118 struct call *call; |
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119 { |
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120 int rc; |
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121 |
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122 rc = start_request_out_msg(msg, "BYE", call->to_uri); |
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123 if (rc < 0) |
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124 return rc; |
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125 rc = add_req_boilerplate(msg, call, "2 BYE", call->to_tag); |
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126 if (rc < 0) |
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127 return rc; |
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128 out_msg_finish(msg); |
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129 return 0; |
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130 } |
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131 |
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132 void |
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133 start_sip_out(call) |
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134 struct call *call; |
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135 { |
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136 struct sip_msg_out msg; |
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137 int rc; |
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138 |
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139 sprintf(call->sip_call_id, "%08u_%u@%s", |
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140 (unsigned)(cur_event_time.tv_sec % 100000000), |
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141 ntohs(call->pstn_rtp_local.sin_port), inet_ntoa(sip_bind_ip)); |
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142 if (find_call_by_sip_id(call->sip_call_id)) { |
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143 syslog(LOG_ERR, "generated Call-ID collision!"); |
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144 call->overall_state = OVERALL_STATE_TEARDOWN; |
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145 disconnect_mncc(call, GSM48_CAUSE_LOC_PRN_S_LU, |
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146 GSM48_CC_CAUSE_SWITCH_CONG); |
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147 disconnect_tmgw(call); |
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148 return; |
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149 } |
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150 sprintf(call->from_header, "<sip:%s@%s>;tag=out%u", call->from_user, |
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151 inet_ntoa(sip_bind_ip), ntohs(call->pstn_rtp_local.sin_port)); |
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152 rc = fill_invite_req_msg(&msg, call); |
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153 if (rc < 0) { |
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154 syslog(LOG_CRIT, "generated SIP INVITE req exceeds msg size!"); |
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155 call->overall_state = OVERALL_STATE_TEARDOWN; |
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156 disconnect_mncc(call, GSM48_CAUSE_LOC_PRN_S_LU, |
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157 GSM48_CC_CAUSE_NETWORK_OOO); |
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158 disconnect_tmgw(call); |
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159 return; |
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160 } |
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161 sip_tx_packet(&msg, &call->udp_sin); |
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162 call->overall_state = OVERALL_STATE_SIP_OUT; |
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163 call->sip_call_exists = 1; |
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164 call->sip_state = SIP_STATE_INV_SENT; |
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165 call->sip_tx_count = 1; |
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166 } |
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167 |
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168 void |
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169 initiate_sip_cancel(call) |
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170 struct call *call; |
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171 { |
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172 struct sip_msg_out msg; |
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173 |
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174 fill_cancel_req_msg(&msg, call); |
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175 sip_tx_packet(&msg, &call->udp_sin); |
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176 call->sip_state = SIP_STATE_CANCEL_SENT; |
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177 call->sip_tx_count = 1; |
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178 } |
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179 |
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180 void |
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181 initiate_bye(call) |
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182 struct call *call; |
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183 { |
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184 struct sip_msg_out msg; |
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185 |
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186 fill_bye_req_msg(&msg, call); |
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187 sip_tx_packet(&msg, &call->udp_sin); |
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188 call->sip_state = SIP_STATE_BYE_SENT; |
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189 call->sip_tx_count = 1; |
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190 } |