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annotate libsip/resp_ident.c @ 93:ff5e96162430

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libsip: new function for extracting Call-ID and CSeq from responses
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 24 Sep 2022 15:13:53 -0800
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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 /*
ff5e96162430 libsip: new function for extracting Call-ID and CSeq from responses
Mychaela Falconia <falcon@freecalypso.org>
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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
Mychaela Falconia <falcon@freecalypso.org>
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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.
ff5e96162430 libsip: new function for extracting Call-ID and CSeq from responses
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7 */
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8
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9 #include <ctype.h>
ff5e96162430 libsip: new function for extracting Call-ID and CSeq from responses
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10 #include <string.h>
ff5e96162430 libsip: new function for extracting Call-ID and CSeq from responses
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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
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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 }