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comparison libsip/req_supp.c @ 49:dec31b1a8b96

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sip-in: check Require and Supported
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 06 Sep 2022 22:57:16 -0800
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48:8117d8ee44a5 49:dec31b1a8b96
1 /*
2 * Here we parse Require and Supported headers in a SIP request,
3 * checking whether our supported extensions are also supported
4 * or required by the client, and catching any client requirements
5 * which we don't support.
6 */
7
8 #include <ctype.h>
9 #include <string.h>
10 #include <strings.h>
11 #include "parse.h"
12 #include "req_supp.h"
13
14 parse_require_supported(msg, lsupp, nlsupp, unsupp)
15 struct sip_pkt_rx *msg;
16 struct supported_ext *lsupp;
17 unsigned nlsupp;
18 char **unsupp;
19 {
20 struct sip_parse_hdr *hdr, *endhdr;
21 char *cp, *np;
22 unsigned n;
23
24 endhdr = msg->hdr_fields + msg->num_hdr_fields;
25 /* check Require first */
26 for (hdr = msg->hdr_fields; hdr < endhdr; hdr++) {
27 if (strcasecmp(hdr->field_name, "Require"))
28 continue;
29 cp = hdr->field_value;
30 for (;;) {
31 while (isspace(*cp) || *cp == ',')
32 cp++;
33 if (!*cp)
34 break;
35 np = cp;
36 while (*cp && !isspace(*cp) && *cp != ',')
37 cp++;
38 if (*cp)
39 *cp++ = '\0';
40 for (n = 0; n < nlsupp; n++) {
41 if (!strcasecmp(np, lsupp[n].name)) {
42 *lsupp[n].req_flag = 1;
43 break;
44 } else {
45 if (unsupp)
46 *unsupp = np;
47 return(-1);
48 }
49 }
50 }
51 }
52 /* now check Supported */
53 for (hdr = msg->hdr_fields; hdr < endhdr; hdr++) {
54 if (strcasecmp(hdr->field_name, "Supported") &&
55 strcasecmp(hdr->field_name, "k"))
56 continue;
57 cp = hdr->field_value;
58 for (;;) {
59 while (isspace(*cp) || *cp == ',')
60 cp++;
61 if (!*cp)
62 break;
63 np = cp;
64 while (*cp && !isspace(*cp) && *cp != ',')
65 cp++;
66 if (*cp)
67 *cp++ = '\0';
68 for (n = 0; n < nlsupp; n++) {
69 if (!strcasecmp(np, lsupp[n].name)) {
70 *lsupp[n].sup_flag = 1;
71 break;
72 }
73 }
74 }
75 }
76 return(0);
77 }