FreeCalypso > hg > themwi-system-sw

annotate libsip/to_tag.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 9ca6f0708237
children
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72
9ca6f0708237 libsip: add extract_to_tag() function
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * The function implemented in this module extracts the tag
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3 * from the To header of a SIP destination server's response.
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4 */
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5
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6 #include <ctype.h>
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7 #include <string.h>
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8 #include <strings.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include "parse.h"
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12
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13 extern char *get_single_header();
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14
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15 char *
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16 extract_to_tag(msg, expect_uri)
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17 struct sip_pkt_rx *msg;
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18 char *expect_uri;
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19 {
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20 char *cp, *tag;
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21 int bracketed, c;
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22 unsigned expect_uri_len;
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23
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24 cp = get_single_header(msg, "To", "t", (int *) 0);
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25 if (!cp)
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26 return 0;
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27 if (*cp == '<') {
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28 cp++;
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29 bracketed = 1;
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30 } else
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31 bracketed = 0;
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32 expect_uri_len = strlen(expect_uri);
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33 if (strncasecmp(cp, expect_uri, expect_uri_len))
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34 return 0;
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35 cp += expect_uri_len;
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36 if (bracketed) {
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37 if (*cp++ != '>')
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38 return 0;
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39 }
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40 while (isspace(*cp))
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41 cp++;
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42 if (*cp++ != ';')
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43 return 0;
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44 while (isspace(*cp))
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45 cp++;
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46 if (strncasecmp(cp, "tag", 3))
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47 return 0;
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48 cp += 3;
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49 while (isspace(*cp))
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50 cp++;
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51 if (*cp++ != '=')
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52 return 0;
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53 while (isspace(*cp))
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54 cp++;
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55 tag = cp;
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56 for (; c = *cp; cp++) {
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57 switch (c) {
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58 case '-':
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59 case '.':
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60 case '!':
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61 case '%':
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62 case '*':
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63 case '_':
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64 case '+':
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65 case '`':
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66 case '\'':
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67 case '~':
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68 continue;
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69 default:
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70 if (isalnum(c))
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71 continue;
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72 return 0;
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73 }
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74 }
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75 return tag;
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76 }