FreeCalypso > hg > themwi-system-sw

annotate sip-in/invite_dup.c @ 145:4b685a5d9bd4

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sip-in code: split invite.c into 3 separate C modules
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 08 Oct 2022 19:31:05 -0800
parents sip-in/invite.c@c93c339271a7
children 54c2f271380d
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1 /*
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2 * Here we process SIP INVITE retransmissions and/or re-INVITEs
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3 * for existing calls.
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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 "../libsip/parse.h"
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17 #include "../libsip/uas_basic.h"
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18 #include "../libsip/sdp.h"
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19 #include "../libsip/out_msg.h"
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20 #include "call.h"
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21
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22 void
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23 invite_existing_call(req, ess, sin, call)
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24 struct sip_pkt_rx *req;
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25 struct uas_parse_hdrs *ess;
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26 struct sockaddr_in *sin;
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27 struct call *call;
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28 {
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29 struct sip_msg_out resp;
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30 int rc;
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31
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32 if (ess->cseq_num != call->invite_cseq) {
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33 start_response_out_msg(&resp, "501 Re-INVITE not supported");
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34 rc = add_resp_basic_headers(&resp, ess, req->req_method);
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35 if (rc < 0) {
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36 syslog(LOG_ERR,
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37 "sending 501 Re-INVITE error: response length exceeded");
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38 return;
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39 }
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40 out_msg_finish(&resp);
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41 sip_tx_packet(&resp, sin);
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42 return;
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43 }
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44 /* it's a retransmission, not a re-INVITE */
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45 switch (call->sip_state) {
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46 case SIP_STATE_INVITE_PROC:
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47 start_response_out_msg(&resp, "100 Proceeding");
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48 fill_invite_resp_from_call(&resp, call);
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49 out_msg_finish(&resp);
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50 sip_tx_packet(&resp, sin);
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51 return;
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52 case SIP_STATE_RINGING:
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53 start_response_out_msg(&resp, "180 Ringing");
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54 fill_invite_resp_from_call(&resp, call);
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55 out_msg_finish(&resp);
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56 sip_tx_packet(&resp, sin);
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57 return;
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58 case SIP_STATE_RINGING_REL:
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59 start_response_out_msg(&resp, "180 Ringing");
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60 fill_invite_resp_from_call(&resp, call);
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61 out_msg_add_header(&resp, "Require", "100rel");
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62 out_msg_add_header(&resp, "RSeq", "1");
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63 out_msg_finish(&resp);
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64 sip_tx_packet(&resp, sin);
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65 return;
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66 case SIP_STATE_INVITE_200:
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67 case SIP_STATE_CONNECTED:
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68 fill_invite_200_resp(&resp, call);
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69 sip_tx_packet(&resp, sin);
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70 return;
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71 case SIP_STATE_INVITE_ERR:
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72 start_response_out_msg(&resp, call->invite_fail);
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73 fill_invite_resp_from_call(&resp, call);
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74 out_msg_finish(&resp);
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75 sip_tx_packet(&resp, sin);
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76 return;
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77 default:
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78 /* silently discard */
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79 return;
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80 }
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81 }