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 <time.h>
  29 #include <stdlib.h>
  30 #include <sys/types.h>
  31 #include <sys/socket.h>
  32 #include <netinet/in.h>
  33 #include <arpa/inet.h>
  34 #include <string.h>
  35
  36 #include <pulse/xmalloc.h>
  37 #include <pulse/util.h>
  38
  39 #include <pulsecore/core-util.h>
  40 #include <pulsecore/log.h>
  41 #include <pulsecore/macro.h>
  42
  43 #include "sdp.h"
  44 #include "rtp.h"
  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], un[64];
  49     const char *u, *f, *a;
  50
  51     pa_assert(src);
  52     pa_assert(dst);
  53     pa_assert(af == AF_INET || af == AF_INET6);
  54
  55     pa_assert_se(f = pa_rtp_format_to_string(ss->format));
  56
  57     if (!(u = pa_get_user_name(un, sizeof(un))))
  58         u = "-";
  59
  60     ntp = time(NULL) + 2208988800U;
  61
  62     pa_assert_se(a = inet_ntop(af, src, buf_src, sizeof(buf_src)));
  63     pa_assert_se(a = inet_ntop(af, dst, buf_dst, sizeof(buf_dst)));
  64
  65     return pa_sprintf_malloc(
  66             PA_SDP_HEADER
  67             "o=%s %lu 0 IN %s %s\n"
  68             "s=%s\n"
  69             "c=IN %s %s\n"
  70             "t=%lu 0\n"
  71             "a=recvonly\n"
  72             "m=audio %u RTP/AVP %i\n"
  73             "a=rtpmap:%i %s/%u/%u\n"
  74             "a=type:broadcast\n",
  75             u, (unsigned long) ntp, af == AF_INET ? "IP4" : "IP6", buf_src,
  76             name,
  77             af == AF_INET ? "IP4" : "IP6", buf_dst,
  78             (unsigned long) ntp,
  79             port, payload,
  80             payload, f, ss->rate, ss->channels);
  81 }
  82
  83 static pa_sample_spec *parse_sdp_sample_spec(pa_sample_spec *ss, char *c) {
  84     unsigned rate, channels;
  85     pa_assert(ss);
  86     pa_assert(c);
  87
  88     if (pa_startswith(c, "L16/")) {
  89         ss->format = PA_SAMPLE_S16BE;
  90         c += 4;
  91     } else if (pa_startswith(c, "L8/")) {
  92         ss->format = PA_SAMPLE_U8;
  93         c += 3;
  94     } else if (pa_startswith(c, "PCMA/")) {
  95         ss->format = PA_SAMPLE_ALAW;
  96         c += 5;
  97     } else if (pa_startswith(c, "PCMU/")) {
  98         ss->format = PA_SAMPLE_ULAW;
  99         c += 5;
 100     } else
 101         return NULL;
 102
 103     if (sscanf(c, "%u/%u", &rate, &channels) == 2) {
 104         ss->rate = rate;
 105         ss->channels = channels;
 106     } else if (sscanf(c, "%u", &rate) == 2) {
 107         ss->rate = rate;
 108         ss->channels = 1;
 109     } else
 110         return NULL;
 111
 112     if (!pa_sample_spec_valid(ss))
 113         return NULL;
 114
 115     return ss;
 116 }
 117
 118 pa_sdp_info *pa_sdp_parse(const char *t, pa_sdp_info *i, int is_goodbye) {
 119     uint16_t port = 0;
 120     int ss_valid = 0;
 121
 122     pa_assert(t);
 123     pa_assert(i);
 124
 125     i->origin = i->session_name = NULL;
 126     i->salen = 0;
 127     i->payload = 255;
 128
 129     if (!pa_startswith(t, PA_SDP_HEADER)) {
 130         pa_log("Failed to parse SDP data: invalid header.");
 131         goto fail;
 132     }
 133
 134     t += sizeof(PA_SDP_HEADER)-1;
 135
 136     while (*t) {
 137         size_t l;
 138
 139         l = strcspn(t, "\n");
 140
 141         if (l <= 2) {
 142             pa_log("Failed to parse SDP data: line too short: >%s<.", t);
 143             goto fail;
 144         }
 145
 146         if (pa_startswith(t, "o="))
 147             i->origin = pa_xstrndup(t+2, l-2);
 148         else if (pa_startswith(t, "s="))
 149             i->session_name = pa_xstrndup(t+2, l-2);
 150         else if (pa_startswith(t, "c=IN IP4 ")) {
 151             char a[64];
 152             size_t k;
 153
 154             k = l-8 > sizeof(a) ? sizeof(a) : l-8;
 155
 156             pa_strlcpy(a, t+9, k);
 157             a[strcspn(a, "/")] = 0;
 158
 159             if (inet_pton(AF_INET, a, &((struct sockaddr_in*) &i->sa)->sin_addr) <= 0) {
 160                 pa_log("Failed to parse SDP data: bad address: >%s<.", a);
 161                 goto fail;
 162             }
 163
 164             ((struct sockaddr_in*) &i->sa)->sin_family = AF_INET;
 165             ((struct sockaddr_in*) &i->sa)->sin_port = 0;
 166             i->salen = sizeof(struct sockaddr_in);
 167         } else if (pa_startswith(t, "c=IN IP6 ")) {
 168             char a[64];
 169             size_t k;
 170
 171             k = l-8 > sizeof(a) ? sizeof(a) : l-8;
 172
 173             pa_strlcpy(a, t+9, k);
 174             a[strcspn(a, "/")] = 0;
 175
 176             if (inet_pton(AF_INET6, a, &((struct sockaddr_in6*) &i->sa)->sin6_addr) <= 0) {
 177                 pa_log("Failed to parse SDP data: bad address: >%s<.", a);
 178                 goto fail;
 179             }
 180
 181             ((struct sockaddr_in6*) &i->sa)->sin6_family = AF_INET6;
 182             ((struct sockaddr_in6*) &i->sa)->sin6_port = 0;
 183             i->salen = sizeof(struct sockaddr_in6);
 184         } else if (pa_startswith(t, "m=audio ")) {
 185
 186             if (i->payload > 127) {
 187                 int _port, _payload;
 188
 189                 if (sscanf(t+8, "%i RTP/AVP %i", &_port, &_payload) == 2) {
 190
 191                     if (_port <= 0 || _port > 0xFFFF) {
 192                         pa_log("Failed to parse SDP data: invalid port %i.", _port);
 193                         goto fail;
 194                     }
 195
 196                     if (_payload < 0 || _payload > 127) {
 197                         pa_log("Failed to parse SDP data: invalid payload %i.", _payload);
 198                         goto fail;
 199                     }
 200
 201                     port = (uint16_t) _port;
 202                     i->payload = (uint8_t) _payload;
 203
 204                     if (pa_rtp_sample_spec_from_payload(i->payload, &i->sample_spec))
 205                         ss_valid = 1;
 206                 }
 207             }
 208         } else if (pa_startswith(t, "a=rtpmap:")) {
 209
 210             if (i->payload <= 127) {
 211                 char c[64];
 212                 int _payload;
 213
 214                 if (sscanf(t+9, "%i %64c", &_payload, c) == 2) {
 215
 216                     if (_payload < 0 || _payload > 127) {
 217                         pa_log("Failed to parse SDP data: invalid payload %i.", _payload);
 218                         goto fail;
 219                     }
 220                     if (_payload == i->payload) {
 221
 222                         c[strcspn(c, "\n")] = 0;
 223
 224                         if (parse_sdp_sample_spec(&i->sample_spec, c))
 225                             ss_valid = 1;
 226                     }
 227                 }
 228             }
 229         }
 230
 231         t += l;
 232
 233         if (*t == '\n')
 234             t++;
 235     }
 236
 237     if (!i->origin || (!is_goodbye && (!i->salen || i->payload > 127 || !ss_valid || port == 0))) {
 238         pa_log("Failed to parse SDP data: missing data.");
 239         goto fail;
 240     }
 241
 242     if (((struct sockaddr*) &i->sa)->sa_family == AF_INET)
 243         ((struct sockaddr_in*) &i->sa)->sin_port = htons(port);
 244     else
 245         ((struct sockaddr_in6*) &i->sa)->sin6_port = htons(port);
 246
 247     return i;
 248
 249 fail:
 250     pa_xfree(i->origin);
 251     pa_xfree(i->session_name);
 252
 253     return NULL;
 254 }
 255
 256 void pa_sdp_info_destroy(pa_sdp_info *i) {
 257     pa_assert(i);
 258
 259     pa_xfree(i->origin);
 260     pa_xfree(i->session_name);
 261 }