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annotate libsip/to_tag.c @ 72:9ca6f0708237

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libsip: add extract_to_tag() function
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 20 Sep 2022 10:54:10 -0800
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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 }