FreeCalypso > hg > themwi-system-sw

annotate libsip/req_supp.c @ 128:5685412bd6aa

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sip-in: pass DTMF start & stop to themwi-mgw
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 01 Oct 2022 23:07:01 -0800
parents dec31b1a8b96
children
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dec31b1a8b96 sip-in: check Require and Supported
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * Here we parse Require and Supported headers in a SIP request,
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Mychaela Falconia <falcon@freecalypso.org>
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3 * checking whether our supported extensions are also supported
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Mychaela Falconia <falcon@freecalypso.org>
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4 * or required by the client, and catching any client requirements
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5 * which we don't support.
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6 */
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7
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8 #include <ctype.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include "parse.h"
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12 #include "req_supp.h"
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13
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14 parse_require_supported(msg, lsupp, nlsupp, unsupp)
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15 struct sip_pkt_rx *msg;
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16 struct supported_ext *lsupp;
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17 unsigned nlsupp;
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18 char **unsupp;
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19 {
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20 struct sip_parse_hdr *hdr, *endhdr;
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21 char *cp, *np;
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22 unsigned n;
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23
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24 endhdr = msg->hdr_fields + msg->num_hdr_fields;
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25 /* check Require first */
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26 for (hdr = msg->hdr_fields; hdr < endhdr; hdr++) {
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27 if (strcasecmp(hdr->field_name, "Require"))
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28 continue;
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29 cp = hdr->field_value;
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30 for (;;) {
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31 while (isspace(*cp) || *cp == ',')
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32 cp++;
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33 if (!*cp)
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34 break;
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35 np = cp;
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36 while (*cp && !isspace(*cp) && *cp != ',')
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37 cp++;
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38 if (*cp)
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39 *cp++ = '\0';
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40 for (n = 0; n < nlsupp; n++) {
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41 if (!strcasecmp(np, lsupp[n].name)) {
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42 *lsupp[n].req_flag = 1;
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43 break;
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44 } else {
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45 if (unsupp)
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46 *unsupp = np;
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47 return(-1);
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48 }
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49 }
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50 }
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51 }
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52 /* now check Supported */
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53 for (hdr = msg->hdr_fields; hdr < endhdr; hdr++) {
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54 if (strcasecmp(hdr->field_name, "Supported") &&
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55 strcasecmp(hdr->field_name, "k"))
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56 continue;
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57 cp = hdr->field_value;
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58 for (;;) {
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59 while (isspace(*cp) || *cp == ',')
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60 cp++;
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61 if (!*cp)
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62 break;
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63 np = cp;
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64 while (*cp && !isspace(*cp) && *cp != ',')
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65 cp++;
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66 if (*cp)
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67 *cp++ = '\0';
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68 for (n = 0; n < nlsupp; n++) {
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69 if (!strcasecmp(np, lsupp[n].name)) {
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70 *lsupp[n].sup_flag = 1;
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71 break;
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72 }
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73 }
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74 }
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75 }
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76 return(0);
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77 }