FreeCalypso > hg > themwi-system-sw

annotate sip-out/reinvite.c @ 167:2ebad02adbe5

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themwi-mncc: route outbound calls to themwi-sip-out
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 12 Oct 2022 18:08:34 -0800
parents 9419fe55824f
children
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1 /*
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2 * Here we handle incoming INVITE requests in the UAS role: even though
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3 * we are strictly outbound, BulkVS servers will send us periodic
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4 * re-INVITEs as keepalives, and we have to play along.
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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 <sys/time.h>
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10 #include <netinet/in.h>
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11 #include <stdio.h>
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12 #include <stdint.h>
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13 #include <stdlib.h>
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14 #include <string.h>
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15 #include <strings.h>
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16 #include <syslog.h>
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17 #include "../include/out_routes.h"
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18 #include "../libsip/parse.h"
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19 #include "../libsip/uas_basic.h"
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20 #include "../libsip/out_msg.h"
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21 #include "call.h"
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22
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23 extern struct call *find_call_by_sip_id();
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24
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25 static void
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26 invite_found_call(req, ess, sin, call)
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27 struct sip_pkt_rx *req;
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28 struct uas_parse_hdrs *ess;
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29 struct sockaddr_in *sin;
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30 struct call *call;
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31 {
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32 struct sip_msg_out resp;
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33 int rc;
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34
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35 switch (call->sip_state) {
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36 case SIP_STATE_INV_SENT:
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37 case SIP_STATE_100_RCVD:
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38 start_response_out_msg(&resp, "491 Outbound INVITE pending");
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39 break;
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40 case SIP_STATE_CONNECTED:
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41 start_response_out_msg(&resp, "200 OK");
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42 break;
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43 case SIP_STATE_CANCEL_SENT:
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44 case SIP_STATE_BYE_SENT:
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45 case SIP_STATE_ACCEPT_100:
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46 case SIP_STATE_ACCEPT_200:
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47 case SIP_STATE_ENDED:
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48 start_response_out_msg(&resp, "488 Call terminated");
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49 break;
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50 case SIP_STATE_MSG_SIZE_ERR:
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51 return;
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52 default:
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53 syslog(LOG_CRIT,
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54 "FATAL: invalid SIP state 0x%x on incoming re-INVITE",
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55 call->sip_state);
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56 exit(1);
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57 }
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58 rc = add_resp_basic_headers(&resp, ess, req->req_method);
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59 if (rc < 0) {
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60 syslog(LOG_ERR, "Re-INVITE response message size error");
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61 return;
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62 }
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63 out_msg_finish(&resp);
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64 sip_tx_packet(&resp, sin);
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65 }
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67 static void
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68 invite_unknown_call(req, ess, sin)
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69 struct sip_pkt_rx *req;
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70 struct uas_parse_hdrs *ess;
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71 struct sockaddr_in *sin;
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72 {
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73 struct sip_msg_out resp;
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74 int rc;
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75
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76 start_response_out_msg(&resp, "405 This gateway is outbound only");
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77 rc = add_resp_basic_headers(&resp, ess, req->req_method);
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78 if (rc < 0)
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79 return;
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80 out_msg_finish(&resp);
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81 sip_tx_packet(&resp, sin);
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82 }
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83
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84 void
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85 handle_invite_req(req, ess, sin)
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86 struct sip_pkt_rx *req;
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87 struct uas_parse_hdrs *ess;
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88 struct sockaddr_in *sin;
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89 {
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90 struct call *call;
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91
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92 call = find_call_by_sip_id(ess->call_id);
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93 if (call)
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94 invite_found_call(req, ess, sin, call);
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95 else
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96 invite_unknown_call(req, ess, sin);
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97 }