code.delx.au - pulseaudio/blob - src/modules/rtp/sdp.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <assert.h>
  29 #include <time.h>
  30 #include <stdlib.h>
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33 #include <netinet/in.h>
  34 #include <arpa/inet.h>
  35 #include <string.h>
  36
  37 #include <pulse/xmalloc.h>
  38
  39 #include <pulsecore/core-util.h>
  40 #include <pulsecore/log.h>
  41
  42 #include "sdp.h"
  43 #include "rtp.h"
  44
  45
  46 char *pa_sdp_build(int af, const void *src, const void *dst, const char *name, uint16_t port, uint8_t payload, const pa_sample_spec *ss) {
  47     uint32_t ntp;
  48     char buf_src[64], buf_dst[64];
  49     const char *u, *f, *a;
  50
  51     assert(src);
  52     assert(dst);
  53     assert(af == AF_INET || af == AF_INET6);
  54
  55     f = pa_rtp_format_to_string(ss->format);
  56     assert(f);
  57
  58     if (!(u = getenv("USER")))
  59         if (!(u = getenv("USERNAME")))
  60             u = "-";
  61
  62     ntp = time(NULL) + 2208988800U;
  63
  64     a = inet_ntop(af, src, buf_src, sizeof(buf_src));
  65     assert(a);
  66     a = inet_ntop(af, dst, buf_dst, sizeof(buf_dst));
  67     assert(a);
  68
  69     return pa_sprintf_malloc(
  70             PA_SDP_HEADER
  71             "o=%s %lu 0 IN %s %s\n"
  72             "s=%s\n"
  73             "c=IN %s %s\n"
  74             "t=%lu 0\n"
  75             "a=recvonly\n"
  76             "m=audio %u RTP/AVP %i\n"
  77             "a=rtpmap:%i %s/%u/%u\n"
  78             "a=type:broadcast\n",
  79             u, (unsigned long) ntp, af == AF_INET ? "IP4" : "IP6", buf_src,
  80             name,
  81             af == AF_INET ? "IP4" : "IP6", buf_dst,
  82             (unsigned long) ntp,
  83             port, payload,
  84             payload, f, ss->rate, ss->channels);
  85 }
  86
  87 static pa_sample_spec *parse_sdp_sample_spec(pa_sample_spec *ss, char *c) {
  88     unsigned rate, channels;
  89     assert(ss);
  90     assert(c);
  91
  92     if (pa_startswith(c, "L16/")) {
  93         ss->format = PA_SAMPLE_S16BE;
  94         c += 4;
  95     } else if (pa_startswith(c, "L8/")) {
  96         ss->format = PA_SAMPLE_U8;
  97         c += 3;
  98     } else if (pa_startswith(c, "PCMA/")) {
  99         ss->format = PA_SAMPLE_ALAW;
 100         c += 5;
 101     } else if (pa_startswith(c, "PCMU/")) {
 102         ss->format = PA_SAMPLE_ULAW;
 103         c += 5;
 104     } else
 105         return NULL;
 106
 107     if (sscanf(c, "%u/%u", &rate, &channels) == 2) {
 108         ss->rate = rate;
 109         ss->channels = channels;
 110     } else if (sscanf(c, "%u", &rate) == 2) {
 111         ss->rate = rate;
 112         ss->channels = 1;
 113     } else
 114         return NULL;
 115
 116     if (!pa_sample_spec_valid(ss))
 117         return NULL;
 118
 119     return ss;
 120 }
 121
 122 pa_sdp_info *pa_sdp_parse(const char *t, pa_sdp_info *i, int is_goodbye) {
 123     uint16_t port = 0;
 124     int ss_valid = 0;
 125
 126     assert(t);
 127     assert(i);
 128
 129     i->origin = i->session_name = NULL;
 130     i->salen = 0;
 131     i->payload = 255;
 132
 133     if (!pa_startswith(t, PA_SDP_HEADER)) {
 134         pa_log("Failed to parse SDP data: invalid header.");
 135         goto fail;
 136     }
 137
 138     t += sizeof(PA_SDP_HEADER)-1;
 139
 140     while (*t) {
 141         size_t l;
 142
 143         l = strcspn(t, "\n");
 144
 145         if (l <= 2) {
 146             pa_log("Failed to parse SDP data: line too short: >%s<.", t);
 147             goto fail;
 148         }
 149
 150         if (pa_startswith(t, "o="))
 151             i->origin = pa_xstrndup(t+2, l-2);
 152         else if (pa_startswith(t, "s="))
 153             i->session_name = pa_xstrndup(t+2, l-2);
 154         else if (pa_startswith(t, "c=IN IP4 ")) {
 155             char a[64];
 156             size_t k;
 157
 158             k = l-8 > sizeof(a) ? sizeof(a) : l-8;
 159
 160             pa_strlcpy(a, t+9, k);
 161             a[strcspn(a, "/")] = 0;
 162
 163             if (inet_pton(AF_INET, a, &((struct sockaddr_in*) &i->sa)->sin_addr) <= 0) {
 164                 pa_log("Failed to parse SDP data: bad address: >%s<.", a);
 165                 goto fail;
 166             }
 167
 168             ((struct sockaddr_in*) &i->sa)->sin_family = AF_INET;
 169             ((struct sockaddr_in*) &i->sa)->sin_port = 0;
 170             i->salen = sizeof(struct sockaddr_in);
 171         } else if (pa_startswith(t, "c=IN IP6 ")) {
 172             char a[64];
 173             size_t k;
 174
 175             k = l-8 > sizeof(a) ? sizeof(a) : l-8;
 176
 177             pa_strlcpy(a, t+9, k);
 178             a[strcspn(a, "/")] = 0;
 179
 180             if (inet_pton(AF_INET6, a, &((struct sockaddr_in6*) &i->sa)->sin6_addr) <= 0) {
 181                 pa_log("Failed to parse SDP data: bad address: >%s<.", a);
 182                 goto fail;
 183             }
 184
 185             ((struct sockaddr_in6*) &i->sa)->sin6_family = AF_INET6;
 186             ((struct sockaddr_in6*) &i->sa)->sin6_port = 0;
 187             i->salen = sizeof(struct sockaddr_in6);
 188         } else if (pa_startswith(t, "m=audio ")) {
 189
 190             if (i->payload > 127) {
 191                 int _port, _payload;
 192
 193                 if (sscanf(t+8, "%i RTP/AVP %i", &_port, &_payload) == 2) {
 194
 195                     if (_port <= 0 || _port > 0xFFFF) {
 196                         pa_log("Failed to parse SDP data: invalid port %i.", _port);
 197                         goto fail;
 198                     }
 199
 200                     if (_payload < 0 || _payload > 127) {
 201                         pa_log("Failed to parse SDP data: invalid payload %i.", _payload);
 202                         goto fail;
 203                     }
 204
 205                     port = (uint16_t) _port;
 206                     i->payload = (uint8_t) _payload;
 207
 208                     if (pa_rtp_sample_spec_from_payload(i->payload, &i->sample_spec))
 209                         ss_valid = 1;
 210                 }
 211             }
 212         } else if (pa_startswith(t, "a=rtpmap:")) {
 213
 214             if (i->payload <= 127) {
 215                 char c[64];
 216                 int _payload;
 217
 218                 if (sscanf(t+9, "%i %64c", &_payload, c) == 2) {
 219
 220                     if (_payload < 0 || _payload > 127) {
 221                         pa_log("Failed to parse SDP data: invalid payload %i.", _payload);
 222                         goto fail;
 223                     }
 224                     if (_payload == i->payload) {
 225
 226                         c[strcspn(c, "\n")] = 0;
 227
 228                         if (parse_sdp_sample_spec(&i->sample_spec, c))
 229                             ss_valid = 1;
 230                     }
 231                 }
 232             }
 233         }
 234
 235         t += l;
 236
 237         if (*t == '\n')
 238             t++;
 239     }
 240
 241     if (!i->origin || (!is_goodbye && (!i->salen || i->payload > 127 || !ss_valid || port == 0))) {
 242         pa_log("Failed to parse SDP data: missing data.");
 243         goto fail;
 244     }
 245
 246     if (((struct sockaddr*) &i->sa)->sa_family == AF_INET)
 247         ((struct sockaddr_in*) &i->sa)->sin_port = htons(port);
 248     else
 249         ((struct sockaddr_in6*) &i->sa)->sin6_port = htons(port);
 250
 251     return i;
 252
 253 fail:
 254     pa_xfree(i->origin);
 255     pa_xfree(i->session_name);
 256
 257     return NULL;
 258 }
 259
 260 void pa_sdp_info_destroy(pa_sdp_info *i) {
 261     assert(i);
 262
 263     pa_xfree(i->origin);
 264     pa_xfree(i->session_name);
 265 }