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annotate sip-in/sip_ack.c @ 109:9b87894704eb

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sip-in: first step toward final call clearing
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 28 Sep 2022 16:32:13 -0800
parents 9e9034ef476c
children c1c94b7fc2e2
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8cf85edca543 sip-in: implement SIP ACK handling
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1 /*
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2 * Here we implement our handling of SIP ACK, the last step
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3 * in the 3-way INVITE handshake.
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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 "call.h"
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19
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20 extern struct call *find_call_by_sip_id();
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21
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22 extern unsigned sip_linger_acked;
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23
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24 void
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25 handle_sip_ack(req, ess, sin)
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26 struct sip_pkt_rx *req;
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27 struct uas_parse_hdrs *ess;
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28 struct sockaddr_in *sin;
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29 {
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30 struct call *call;
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31
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32 call = find_call_by_sip_id(ess->call_id);
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33 if (!call)
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34 return; /* ignore spurious ACK */
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35 /* weed out wrong CSeq */
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36 if (ess->cseq_num != call->invite_cseq)
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37 return;
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38 switch (call->sip_state) {
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39 case SIP_STATE_INVITE_200:
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40 switch (call->overall_state) {
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41 case OVERALL_STATE_ANSWERED:
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42 call->sip_state = SIP_STATE_CONNECTED;
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43 send_mncc_connect_ack(call);
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44 break;
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45 case OVERALL_STATE_TEARDOWN:
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46 initiate_bye(call);
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47 break;
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48 default:
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49 syslog(LOG_CRIT,
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50 "FATAL: invalid overall state 0x%x on SIP ACK",
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51 call->overall_state);
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52 exit(1);
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53 }
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54 break;
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55 case SIP_STATE_INVITE_ERR:
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56 call->sip_state = SIP_STATE_ENDED;
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57 sip_mark_end_time(call, sip_linger_acked);
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58 break;
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59 }
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60 }