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

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