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annotate libsip/sdp_parse.c @ 53:2423f3aac4ce

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libsip: SDP parsing implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 08 Sep 2022 10:45:50 -0800
parents
children bea761629c5b
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53
2423f3aac4ce libsip: SDP parsing implemented
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * Here we implement the function that parses received SDP descriptions.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/socket.h>
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7 #include <netinet/in.h>
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8 #include <arpa/inet.h>
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9 #include <ctype.h>
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10 #include <string.h>
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11 #include <strings.h>
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12 #include <stdlib.h>
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13 #include "../include/tmgw_const.h"
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14 #include "sdp.h"
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15
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16 parse_incoming_sdp(body, bodylen, dist)
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17 char *body;
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18 unsigned bodylen;
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19 struct sdp_parse *dist;
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20 {
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21 char *cp, *endp;
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22 int got_c = 0, got_m = 0, prefer_pcma = 0;
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23 unsigned codec;
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24
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25 cp = body;
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26 endp = body + bodylen;
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27 while (cp < endp) {
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28 if (!islower(cp[0]) || cp[1] != '=')
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29 return(-1);
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30 switch (cp[0]) {
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31 case 'c':
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32 if (got_c)
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33 return(-1);
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34 got_c = 1;
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35 if (strncmp(cp + 2, "IN IP4 ", 7))
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36 return(-1);
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37 cp += 9;
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38 dist->ip_addr.s_addr = inet_addr(cp);
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39 if (dist->ip_addr.s_addr == INADDR_NONE)
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40 return(-1);
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41 break;
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42 case 'm':
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43 if (got_m)
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44 return(-1);
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45 got_m = 1;
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46 if (strncmp(cp + 2, "audio ", 6))
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47 return(-1);
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48 cp += 8;
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49 if (!isdigit(*cp))
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50 return(-1);
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51 dist->audio_port = strtoul(cp, &cp, 10);
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52 if (!strncmp(cp, " RTP/AVP", 8))
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53 return(-1);
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54 cp += 8;
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55 dist->codec_mask = 0;
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56 for (;;) {
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57 if (*cp == '\r' || *cp == '\n')
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58 break;
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59 if (*cp++ != ' ')
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60 return(-1);
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61 codec = strtoul(cp, &cp, 10);
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62 switch (codec) {
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63 case PSTN_CODEC_PCMU:
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64 dist->codec_mask |= SDP_CODEC_MASK_PCMU;
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65 break;
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66 case PSTN_CODEC_PCMA:
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67 if (!dist->codec_mask)
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68 prefer_pcma = 1;
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69 dist->codec_mask |= SDP_CODEC_MASK_PCMA;
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70 break;
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71 }
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72 }
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73 if (dist->codec_mask == SDP_CODEC_MASK_BOTH &&
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74 prefer_pcma)
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75 dist->codec_mask |= SDP_CODEC_MASK_PCMA_PREF;
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76 break;
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77 default:
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78 cp += 2;
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79 }
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80 for (;;) {
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81 if (cp >= endp)
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82 return(-1);
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83 if (!*cp)
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84 return(-1);
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85 if (*cp == '\n') {
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86 cp++;
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87 break;
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88 }
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89 if (*cp == '\r') {
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90 cp++;
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91 if (cp >= endp)
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92 return(-1);
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93 if (*cp++ != '\n')
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94 return(-1);
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95 break;
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96 }
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97 cp++;
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98 }
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99 }
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100 if (got_c && got_m)
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101 return(0);
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102 else
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103 return(-1);
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104 }