FreeCalypso > hg > themwi-system-sw

annotate libsip/resp_ident.c @ 124:7e04d28fae8b

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sip-in: default use-100rel to no BulkVS servers act badly when we send a reliable 180 Ringing response to an incoming call, even though they advertise 100rel support in the Supported header in the INVITE packet, and we probably won't be implementing 100rel for outbound because doing per-the-spec PRACK as a UAC is just too burdensome. Therefore, we need to consider 100rel extension as not-really-supported in themwi-system-sw.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 01 Oct 2022 15:54:50 -0800
parents ff5e96162430
children
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ff5e96162430 libsip: new function for extracting Call-ID and CSeq from responses
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * In this module we implement an essential step in the process
ff5e96162430 libsip: new function for extracting Call-ID and CSeq from responses
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3 * of handling incoming SIP response messages: extracting Call-ID
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4 * and CSeq headers and preparsing the latter, providing key info
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5 * for matching these incoming responses with call state and
ff5e96162430 libsip: new function for extracting Call-ID and CSeq from responses
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6 * with outstanding UAC requests.
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7 */
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8
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9 #include <ctype.h>
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10 #include <string.h>
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11 #include <strings.h>
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12 #include <stdio.h>
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13 #include <stdlib.h>
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14 #include "parse.h"
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15 #include "resp_ident.h"
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16
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17 extern char *get_single_header();
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18
ff5e96162430 libsip: new function for extracting Call-ID and CSeq from responses
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19 sip_resp_extract_ident(msg, id)
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20 struct sip_pkt_rx *msg;
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21 struct sip_resp_ident *id;
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22 {
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23 char *hval, *cp;
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24 int dup_flag = 0;
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25
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26 hval = get_single_header(msg, "Call-ID", "i", &dup_flag);
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27 if (!hval || dup_flag) {
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28 id->error_field = "Call-ID";
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29 return(-1);
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30 }
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31 id->call_id = hval;
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32 hval = get_single_header(msg, "CSeq", (char *) 0, &dup_flag);
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33 if (!hval || dup_flag) {
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34 bad_cseq: id->error_field = "CSeq";
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35 return(-1);
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36 }
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37 if (!isdigit(*hval))
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38 goto bad_cseq;
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39 id->cseq_num = strtoul(hval, &cp, 10);
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40 if (!isspace(*cp))
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41 goto bad_cseq;
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42 while (isspace(*cp))
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43 cp++;
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44 if (!isupper(*cp))
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45 goto bad_cseq;
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46 id->cseq_method = cp;
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47 while (isalnum(*cp))
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48 cp++;
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49 if (*cp)
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50 goto bad_cseq;
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51 return(0);
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52 }