sjero.net Git - linphone/blob - coreapi/sal_eXosip2_sdp.c

   1 /*
   2 linphone
   3 Copyright (C) 2010  Simon MORLAT (simon.morlat@free.fr)
   4
   5 This program is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU General Public License
   7 as published by the Free Software Foundation; either version 2
   8 of the License, or (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18 */
  19
  20
  21 #include "ortp/b64.h"
  22 #include "ortp/ortp_srtp.h"
  23 #include "sal.h"
  24 #include <eXosip2/eXosip.h>
  25
  26 #define keywordcmp(key,b) strncmp(key,b,sizeof(key))
  27
  28 #ifdef FOR_LATER
  29
  30 static char *make_relay_session_id(const char *username, const char *relay){
  31         /*ideally this should be a hash of the parameters with a random part*/
  32         char tmp[128];
  33         int s1=(int)random();
  34         int s2=(int)random();
  35         long long int res=((long long int)s1)<<32 | (long long int) s2;
  36         void *src=&res;
  37         b64_encode(src, sizeof(long long int), tmp, sizeof(tmp));
  38         return osip_strdup(tmp);
  39 }
  40
  41
  42 static void add_relay_info(sdp_message_t *sdp, int mline, const char *relay, const char *relay_session_id){
  43
  44         if (relay) sdp_message_a_attribute_add(sdp, mline,
  45                                      osip_strdup ("relay-addr"),osip_strdup(relay));
  46         if (relay_session_id) sdp_message_a_attribute_add(sdp, mline,
  47                                      osip_strdup ("relay-session-id"), osip_strdup(relay_session_id));
  48 }
  49
  50 #endif
  51
  52 static char * int_2char(int a){
  53         char *p=osip_malloc(16);
  54         snprintf(p,16,"%i",a);
  55         return p;
  56 }
  57
  58 /* return the value of attr "field" for payload pt at line pos (field=rtpmap,fmtp...)*/
  59 static const char *sdp_message_a_attr_value_get_with_pt(sdp_message_t *sdp,int pos,int pt,const char *field)
  60 {
  61         int i,tmppt=0,scanned=0;
  62         char *tmp;
  63         sdp_attribute_t *attr;
  64         for (i=0;(attr=sdp_message_attribute_get(sdp,pos,i))!=NULL;i++){
  65                 if (keywordcmp(field,attr->a_att_field)==0 && attr->a_att_value!=NULL){
  66                         int nb = sscanf(attr->a_att_value,"%i %n",&tmppt,&scanned);
  67                         /* the return value may depend on how %n is interpreted by the libc: see manpage*/
  68                         if (nb == 1 || nb==2 ){
  69                                 if (pt==tmppt){
  70                                         tmp=attr->a_att_value+scanned;
  71                                         if (strlen(tmp)>0)
  72                                                 return tmp;
  73                                 }
  74                         }else ms_warning("sdp has a strange a= line (%s) nb=%i",attr->a_att_value,nb);
  75                 }
  76         }
  77         return NULL;
  78 }
  79
  80 #ifdef FOR_LATER
  81 /* return the value of attr "field" */
  82 static const char *sdp_message_a_attr_value_get(sdp_message_t *sdp,int pos,const char *field)
  83 {
  84         int i;
  85         sdp_attribute_t *attr;
  86         for (i=0;(attr=sdp_message_attribute_get(sdp,pos,i))!=NULL;i++){
  87                 if (keywordcmp(field,attr->a_att_field)==0 && attr->a_att_value!=NULL){
  88                         return attr->a_att_value;
  89                 }
  90         }
  91         return NULL;
  92 }
  93 #endif
  94
  95 static int _sdp_message_get_a_ptime(sdp_message_t *sdp, int mline){
  96         int i,ret;
  97         sdp_attribute_t *attr;
  98         for (i=0;(attr=sdp_message_attribute_get(sdp,mline,i))!=NULL;i++){
  99                 if (keywordcmp("ptime",attr->a_att_field)==0){
 100                         int nb = sscanf(attr->a_att_value,"%i",&ret);
 101                         /* the return value may depend on how %n is interpreted by the libc: see manpage*/
 102                         if (nb == 1){
 103                                 return ret;
 104                         }else ms_warning("sdp has a strange a=ptime line (%s) ",attr->a_att_value);
 105                 }
 106         }
 107         return 0;
 108 }
 109
 110 static int _sdp_message_get_mline_dir(sdp_message_t *sdp, int mline){
 111         int i;
 112         sdp_attribute_t *attr;
 113         for (i=0;(attr=sdp_message_attribute_get(sdp,mline,i))!=NULL;i++){
 114                 if (keywordcmp("sendrecv",attr->a_att_field)==0){
 115                         return SalStreamSendRecv;
 116                 }else if (keywordcmp("sendonly",attr->a_att_field)==0){
 117                         return SalStreamSendOnly;
 118                 }else if (keywordcmp("recvonly",attr->a_att_field)==0){
 119                         return SalStreamRecvOnly;
 120                 }else if (keywordcmp("inactive",attr->a_att_field)==0){
 121                         return SalStreamInactive;
 122                 }
 123         }
 124         return SalStreamSendRecv;
 125 }
 126
 127 static sdp_message_t *create_generic_sdp(const SalMediaDescription *desc, const IceSession *ice_session)
 128 {
 129         sdp_message_t *local;
 130         int inet6;
 131         char sessid[16];
 132         char sessver[16];
 133         const char *rtp_addr = desc->addr;
 134
 135         snprintf(sessid,16,"%i",desc->session_id);
 136         snprintf(sessver,16,"%i",desc->session_ver);
 137         sdp_message_init (&local);
 138         if (strchr(desc->addr,':')!=NULL){
 139                 inet6=1;
 140         }else inet6=0;
 141         sdp_message_v_version_set (local, osip_strdup ("0"));
 142         sdp_message_o_origin_set (local, osip_strdup (desc->username),
 143                           osip_strdup (sessid), osip_strdup (sessver),
 144                           osip_strdup ("IN"), inet6 ? osip_strdup("IP6") : osip_strdup ("IP4"),
 145                           osip_strdup (desc->addr));
 146         sdp_message_s_name_set (local, osip_strdup ("Talk"));
 147         if ((ice_session != NULL) && (ice_session_check_list(ice_session, 0) != NULL)) {
 148                 if (ice_session_state(ice_session) == IS_Completed) {
 149                         ice_check_list_nominated_valid_local_candidate(ice_session_check_list(ice_session, 0), &rtp_addr, NULL, NULL, NULL);
 150                 }
 151                 else {
 152                         ice_check_list_default_local_candidate(ice_session_check_list(ice_session, 0), &rtp_addr, NULL, NULL, NULL);
 153                 }
 154         }
 155         if(!sal_media_description_has_dir (desc,SalStreamSendOnly))
 156         {
 157                 sdp_message_c_connection_add (local, -1,
 158                                 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 159                                                 osip_strdup (rtp_addr), NULL, NULL);
 160         }
 161         else
 162         {
 163                 sdp_message_c_connection_add (local, -1,
 164                                 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 165                                                 inet6 ? osip_strdup ("::0") : osip_strdup ("0.0.0.0"), NULL, NULL);
 166         }
 167         sdp_message_t_time_descr_add (local, osip_strdup ("0"), osip_strdup ("0"));
 168         if (desc->bandwidth>0) sdp_message_b_bandwidth_add (local, -1, osip_strdup ("AS"),
 169                         int_2char(desc->bandwidth));
 170         if ((ice_session != NULL) && (ice_session_check_list(ice_session, 0) != NULL)) {
 171                 char buffer[512];
 172                 switch (ice_session_state(ice_session)) {
 173                         case IS_Completed:
 174                                 sdp_message_a_attribute_add(local, -1, osip_strdup("nortpproxy"), osip_strdup("yes"));
 175                                 /* No break to also include the ice-ufrag and ice-pwd attributes when ICE session is completed. */
 176                         case IS_Running:
 177                         case IS_Stopped:
 178                                 snprintf(buffer, sizeof(buffer), "%s", ice_session_local_pwd(ice_session));
 179                                 sdp_message_a_attribute_add(local, -1, osip_strdup("ice-pwd"), osip_strdup(buffer));
 180                                 snprintf(buffer, sizeof(buffer), "%s", ice_session_local_ufrag(ice_session));
 181                                 sdp_message_a_attribute_add(local, -1, osip_strdup("ice-ufrag"), osip_strdup(buffer));
 182                                 break;
 183                         default:
 184                                 break;
 185                 }
 186         }
 187
 188         return local;
 189 }
 190
 191
 192 static bool_t is_known_rtpmap(const PayloadType *pt){
 193         switch(payload_type_get_number(pt)){
 194                 case 0:
 195                 case 8:
 196                 case 3:
 197                 case 34:
 198                         return TRUE;
 199         }
 200         return FALSE;
 201 }
 202
 203 static void add_payload(sdp_message_t *msg, int line, const PayloadType *pt, bool_t strip_well_known_rtpmaps)
 204 {
 205         char attr[256];
 206         sdp_message_m_payload_add (msg,line, int_2char (payload_type_get_number(pt)));
 207
 208         if (!strip_well_known_rtpmaps || !is_known_rtpmap(pt)){
 209                 if (pt->channels>1)
 210                         snprintf (attr,sizeof(attr),"%i %s/%i/%i", payload_type_get_number(pt),
 211                                         pt->mime_type, pt->clock_rate,pt->channels);
 212                 else
 213                         snprintf (attr,sizeof(attr),"%i %s/%i", payload_type_get_number(pt),
 214                                         pt->mime_type, pt->clock_rate);
 215                 sdp_message_a_attribute_add (msg, line,
 216                                                  osip_strdup ("rtpmap"), osip_strdup(attr));
 217         }
 218
 219         if (pt->recv_fmtp != NULL)
 220         {
 221                 snprintf (attr,sizeof(attr),"%i %s", payload_type_get_number(pt),pt->recv_fmtp);
 222                 sdp_message_a_attribute_add (msg, line, osip_strdup ("fmtp"),
 223                                      osip_strdup(attr));
 224         }
 225 }
 226
 227 static void add_candidate_attribute(sdp_message_t *msg, int lineno, const IceCandidate *candidate)
 228 {
 229         char buffer[1024];
 230         int nb;
 231
 232         nb = snprintf(buffer, sizeof(buffer), "%s %d UDP %d %s %d typ %s",
 233                 candidate->foundation, candidate->componentID, candidate->priority, candidate->taddr.ip, candidate->taddr.port, ice_candidate_type(candidate));
 234         if (nb < 0) {
 235                 ms_error("Cannot add ICE candidate attribute!");
 236                 return;
 237         }
 238         if (candidate->type != ICT_HostCandidate) {
 239                 nb = snprintf(buffer + nb, sizeof(buffer) - nb, " raddr %s rport %d", candidate->base->taddr.ip, candidate->base->taddr.port);
 240                 if (nb < 0) {
 241                         ms_error("Cannot add ICE candidate attribute!");
 242                         return;
 243                 }
 244         }
 245         sdp_message_a_attribute_add(msg, lineno, osip_strdup("candidate"), osip_strdup(buffer));
 246 }
 247
 248 static void add_ice_candidates(sdp_message_t *msg, int lineno, const IceCheckList *ice_cl, const char *rtp_addr, int rtp_port, const char *rtcp_addr, int rtcp_port)
 249 {
 250         const IceCandidate *candidate;
 251         int i;
 252
 253         if ((ice_check_list_state(ice_cl) == ICL_Failed) && ice_check_list_is_mismatch(ice_cl)) {
 254                 sdp_message_a_attribute_add(msg, lineno, osip_strdup("ice-mismatch"), NULL);
 255                 return;
 256         }
 257         for (i = 0; i < ms_list_size(ice_cl->local_candidates); i++) {
 258                 candidate = ms_list_nth_data(ice_cl->local_candidates, i);
 259                 switch (ice_check_list_state(ice_cl)) {
 260                         case ICL_Running:
 261                                 add_candidate_attribute(msg, lineno, candidate);
 262                                 break;
 263                         case ICL_Completed:
 264                                 /* Only include the candidates matching the default destination for each component of the stream as specified in RFC5245 section 9.1.2.2. */
 265                                 if (((candidate->taddr.port == rtp_port) && (strlen(candidate->taddr.ip) == strlen(rtp_addr)) && (strcmp(candidate->taddr.ip, rtp_addr) == 0))
 266                                         || ((candidate->taddr.port == rtcp_port) && (strlen(candidate->taddr.ip) == strlen(rtcp_addr)) && (strcmp(candidate->taddr.ip, rtcp_addr) == 0))) {
 267                                         add_candidate_attribute(msg, lineno, candidate);
 268                                 }
 269                                 break;
 270                         default:
 271                                 break;
 272                 }
 273         }
 274 }
 275
 276 static void add_ice_remote_candidates(sdp_message_t *msg, int lineno, const IceCheckList *ice_cl)
 277 {
 278         char buffer[1024];
 279         const char *rtp_addr = NULL;
 280         const char *rtcp_addr = NULL;
 281         int rtp_port;
 282         int rtcp_port;
 283         int nb;
 284
 285         if ((ice_session_role(ice_cl->session) == IR_Controlling) && (ice_check_list_state(ice_cl) == ICL_Completed)) {
 286                 ice_check_list_nominated_valid_remote_candidate(ice_cl, &rtp_addr, &rtp_port, &rtcp_addr, &rtcp_port);
 287                 nb = snprintf(buffer, sizeof(buffer), "1 %s %d", rtp_addr, rtp_port);
 288                 if (nb < 0) {
 289                         ms_error("Cannot add ICE remote-candidates attribute!");
 290                         return;
 291                 }
 292                 if (rtcp_addr != NULL) {
 293                         nb = snprintf(buffer + nb, sizeof(buffer) - nb, " 2 %s %d", rtcp_addr, rtcp_port);
 294                         if (nb < 0) {
 295                                 ms_error("Cannot add ICE remote-candidates attribute!");
 296                                 return;
 297                         }
 298                 }
 299                 sdp_message_a_attribute_add(msg, lineno, osip_strdup("remote-candidates"), osip_strdup(buffer));
 300         }
 301 }
 302
 303 static void add_line(sdp_message_t *msg, int lineno, const SalStreamDescription *desc, const IceCheckList *ice_cl){
 304         const char *mt=NULL;
 305         const MSList *elem;
 306         const char *rtp_addr;
 307         const char *rtcp_addr;
 308         const char *dir="sendrecv";
 309         int rtp_port;
 310         int rtcp_port;
 311         bool_t strip_well_known_rtpmaps;
 312
 313         switch (desc->type) {
 314         case SalAudio:
 315                 mt="audio";
 316                 break;
 317         case SalVideo:
 318                 mt="video";
 319                 break;
 320         case SalOther:
 321                 mt=desc->typeother;
 322                 break;
 323         }
 324         rtp_addr=rtcp_addr=desc->rtp_addr;
 325         rtp_port=desc->rtp_port;
 326         rtcp_port=desc->rtcp_port;
 327         if (ice_cl != NULL) {
 328                 if (ice_check_list_state(ice_cl) == ICL_Completed) {
 329                         ice_check_list_nominated_valid_local_candidate(ice_cl, &rtp_addr, &rtp_port, &rtcp_addr, &rtcp_port);
 330                 } else {
 331                         ice_check_list_default_local_candidate(ice_cl, &rtp_addr, &rtp_port, &rtcp_addr, &rtcp_port);
 332                 }
 333         } else if (desc->candidates[0].addr[0]!='\0'){
 334                 rtp_addr=desc->candidates[0].addr;
 335                 rtp_port=desc->candidates[0].port;
 336         }
 337
 338         if (desc->proto == SalProtoRtpSavp) {
 339                 int i;
 340
 341                 sdp_message_m_media_add (msg, osip_strdup (mt),
 342                                          int_2char (rtp_port), NULL,
 343                                          osip_strdup ("RTP/SAVP"));
 344
 345                 /* add crypto lines */
 346                 for(i=0; i<SAL_CRYPTO_ALGO_MAX; i++) {
 347                         char buffer[1024];
 348                         switch (desc->crypto[i].algo) {
 349                                 case AES_128_SHA1_80:
 350                                         snprintf(buffer, 1024, "%d %s inline:%s",
 351                                                 desc->crypto[i].tag, "AES_CM_128_HMAC_SHA1_80", desc->crypto[i].master_key);
 352                                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("crypto"),
 353                                                 osip_strdup(buffer));
 354                                         break;
 355                                 case AES_128_SHA1_32:
 356                                         snprintf(buffer, 1024, "%d %s inline:%s",
 357                                                 desc->crypto[i].tag, "AES_CM_128_HMAC_SHA1_32", desc->crypto[i].master_key);
 358                                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("crypto"),
 359                                                 osip_strdup(buffer));
 360                                         break;
 361                                 case AES_128_NO_AUTH:
 362                                         ms_warning("Unsupported crypto suite: AES_128_NO_AUTH");
 363                                         break;
 364                                 case NO_CIPHER_SHA1_80:
 365                                         ms_warning("Unsupported crypto suite: NO_CIPHER_SHA1_80");
 366                                         break;
 367                                 default:
 368                                         i = SAL_CRYPTO_ALGO_MAX;
 369                         }
 370                 }
 371
 372         } else {
 373                 sdp_message_m_media_add (msg, osip_strdup (mt),
 374                                          int_2char (rtp_port), NULL,
 375                                          osip_strdup ("RTP/AVP"));
 376
 377         }
 378
 379         /*only add a c= line within the stream description if address are differents*/
 380         if (rtp_addr[0]!='\0' && strcmp(rtp_addr,sdp_message_c_addr_get(msg, -1, 0))!=0){
 381                 bool_t inet6;
 382                 if (strchr(rtp_addr,':')!=NULL){
 383                         inet6=TRUE;
 384                 }else inet6=FALSE;
 385                 sdp_message_c_connection_add (msg, lineno,
 386                               osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 387                               osip_strdup (rtp_addr), NULL, NULL);
 388         }
 389
 390         if (desc->bandwidth>0) sdp_message_b_bandwidth_add (msg, lineno, osip_strdup ("AS"),
 391                                      int_2char(desc->bandwidth));
 392         if (desc->ptime>0) sdp_message_a_attribute_add(msg,lineno,osip_strdup("ptime"),
 393                                 int_2char(desc->ptime));
 394         strip_well_known_rtpmaps=ms_list_size(desc->payloads)>5;
 395         if (desc->payloads){
 396                 for(elem=desc->payloads;elem!=NULL;elem=elem->next){
 397                         add_payload(msg, lineno, (PayloadType*)elem->data,strip_well_known_rtpmaps);
 398                 }
 399         }else{
 400                 /* to comply with SDP we cannot have an empty payload type number list */
 401                 /* as it happens only when mline is declined with a zero port, it does not matter to put whatever codec*/
 402                 sdp_message_m_payload_add (msg,lineno, int_2char (0));
 403         }
 404         switch(desc->dir){
 405                 case SalStreamSendRecv:
 406                         /*dir="sendrecv";*/
 407                         dir=NULL;
 408                 break;
 409                 case SalStreamRecvOnly:
 410                         dir="recvonly";
 411                         break;
 412                 case SalStreamSendOnly:
 413                         dir="sendonly";
 414                         break;
 415                 case SalStreamInactive:
 416                         dir="inactive";
 417                         break;
 418         }
 419         if (dir) sdp_message_a_attribute_add (msg, lineno, osip_strdup (dir),NULL);
 420         if (ice_cl != NULL) {
 421                 if (strcmp(rtp_addr, rtcp_addr) != 0) {
 422                         char buffer[1024];
 423                         snprintf(buffer, sizeof(buffer), "%u IN IP4 %s", rtcp_port, rtcp_addr);
 424                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("rtcp"), osip_strdup(buffer));
 425                 } else {
 426                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("rtcp"), int_2char(rtcp_port));
 427                 }
 428                 add_ice_candidates(msg, lineno, ice_cl, rtp_addr, rtp_port, rtcp_addr, rtcp_port);
 429                 add_ice_remote_candidates(msg, lineno, ice_cl);
 430         }
 431 }
 432
 433
 434 sdp_message_t *media_description_to_sdp(const SalMediaDescription *desc, const IceSession *ice_session){
 435         IceCheckList *ice_cl = NULL;
 436         int i;
 437         sdp_message_t *msg=create_generic_sdp(desc, ice_session);
 438         for(i=0;i<desc->nstreams;++i){
 439                 if (ice_session != NULL) ice_cl = ice_session_check_list(ice_session, i);
 440                 else ice_cl = NULL;
 441                 add_line(msg,i,&desc->streams[i], ice_cl);
 442         }
 443         return msg;
 444 }
 445
 446 static int payload_type_fill_from_rtpmap(PayloadType *pt, const char *rtpmap){
 447         if (rtpmap==NULL){
 448                 PayloadType *refpt=rtp_profile_get_payload(&av_profile,payload_type_get_number(pt));
 449                 if (refpt){
 450                         pt->mime_type=ms_strdup(refpt->mime_type);
 451                         pt->clock_rate=refpt->clock_rate;
 452                 }else{
 453                         ms_error("payload number %i has no rtpmap and is unknown in AV Profile, ignored.",
 454                             payload_type_get_number(pt));
 455                         return -1;
 456                 }
 457         }else{
 458                 char *mime=ms_strdup(rtpmap);
 459                 char *p=strchr(mime,'/');
 460                 if (p){
 461                         char *chans;
 462                         *p='\0';
 463                         p++;
 464                         chans=strchr(p,'/');
 465                         if (chans){
 466                                 *chans='\0';
 467                                 chans++;
 468                                 pt->channels=atoi(chans);
 469                         }else pt->channels=1;
 470                         pt->clock_rate=atoi(p);
 471                 }
 472                 pt->mime_type=mime;
 473         }
 474         return 0;
 475 }
 476
 477 int sdp_to_media_description(sdp_message_t *msg, SalMediaDescription *desc, IceSession **ice_session){
 478         int i,j;
 479         const char *mtype,*proto,*rtp_port,*rtp_addr,*number;
 480         const char *ice_ufrag, *ice_pwd, *ice_remote_candidates=NULL;
 481         sdp_bandwidth_t *sbw=NULL;
 482         sdp_attribute_t *attr;
 483         int media_attribute_nb;
 484         bool_t ice_session_just_created = FALSE;
 485         bool_t ice_lite = FALSE;
 486
 487         rtp_addr=sdp_message_c_addr_get (msg, -1, 0);
 488         if (rtp_addr)
 489                 strncpy(desc->addr,rtp_addr,sizeof(desc->addr));
 490         for(j=0;(sbw=sdp_message_bandwidth_get(msg,-1,j))!=NULL;++j){
 491                 if (strcasecmp(sbw->b_bwtype,"AS")==0) desc->bandwidth=atoi(sbw->b_bandwidth);
 492         }
 493
 494         /* for each m= line */
 495         for (i=0; !sdp_message_endof_media (msg, i) && i<SAL_MEDIA_DESCRIPTION_MAX_STREAMS; i++)
 496         {
 497                 SalStreamDescription *stream=&desc->streams[i];
 498
 499                 memset(stream,0,sizeof(*stream));
 500                 mtype = sdp_message_m_media_get(msg, i);
 501                 proto = sdp_message_m_proto_get (msg, i);
 502                 rtp_port = sdp_message_m_port_get(msg, i);
 503                 stream->proto=SalProtoUnknown;
 504                 if (proto){
 505                         if (strcasecmp(proto,"RTP/AVP")==0)
 506                                 stream->proto=SalProtoRtpAvp;
 507                         else if (strcasecmp(proto,"RTP/SAVP")==0){
 508                                 stream->proto=SalProtoRtpSavp;
 509                         }
 510                 }
 511                 rtp_addr = sdp_message_c_addr_get (msg, i, 0);
 512                 if (rtp_addr != NULL)
 513                         strncpy(stream->rtp_addr,rtp_addr,sizeof(stream->rtp_addr));
 514                 if (rtp_port)
 515                         stream->rtp_port=atoi(rtp_port);
 516
 517                 stream->ptime=_sdp_message_get_a_ptime(msg,i);
 518                 if (strcasecmp("audio", mtype) == 0){
 519                         stream->type=SalAudio;
 520                 }else if (strcasecmp("video", mtype) == 0){
 521                         stream->type=SalVideo;
 522                 }else {
 523                         stream->type=SalOther;
 524                         strncpy(stream->typeother,mtype,sizeof(stream->typeother)-1);
 525                 }
 526                 for(j=0;(sbw=sdp_message_bandwidth_get(msg,i,j))!=NULL;++j){
 527                         if (strcasecmp(sbw->b_bwtype,"AS")==0) stream->bandwidth=atoi(sbw->b_bandwidth);
 528                 }
 529                 stream->dir=_sdp_message_get_mline_dir(msg,i);
 530                 media_attribute_nb = 0;
 531                 /* for each payload type */
 532                 for (j=0;((number=sdp_message_m_payload_get (msg, i,j)) != NULL); j++){
 533                         const char *rtpmap,*fmtp;
 534                         int ptn=atoi(number);
 535                         PayloadType *pt=payload_type_new();
 536                         payload_type_set_number(pt,ptn);
 537                         /* get the rtpmap associated to this codec, if any */
 538                         rtpmap=sdp_message_a_attr_value_get_with_pt(msg, i,ptn,"rtpmap");
 539                         if (rtpmap != NULL) media_attribute_nb++;
 540                         if (payload_type_fill_from_rtpmap(pt,rtpmap)==0){
 541                                 /* get the fmtp, if any */
 542                                 fmtp=sdp_message_a_attr_value_get_with_pt(msg, i, ptn,"fmtp");
 543                                 if (fmtp != NULL) media_attribute_nb++;
 544                                 payload_type_set_send_fmtp(pt,fmtp);
 545                                 stream->payloads=ms_list_append(stream->payloads,pt);
 546                                 ms_message("Found payload %s/%i fmtp=%s",pt->mime_type,pt->clock_rate,
 547                                         pt->send_fmtp ? pt->send_fmtp : "");
 548                         }
 549                 }
 550
 551                 /* Get media specific RTCP attribute */
 552                 stream->rtcp_port = stream->rtp_port + 1;
 553                 snprintf(stream->rtcp_addr, sizeof(stream->rtcp_addr), stream->rtp_addr);
 554                 for (j = 0; ((attr = sdp_message_attribute_get(msg, i, j)) != NULL); j++) {
 555                         if ((keywordcmp("rtcp", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 556                                 char tmp[256];
 557                                 int nb = sscanf(attr->a_att_value, "%d IN IP4 %s", &stream->rtcp_port, tmp);
 558                                 if (nb == 1) {
 559                                         /* SDP rtcp attribute only contains the port */
 560                                 } else if (nb == 2) {
 561                                         strncpy(stream->rtcp_addr, tmp, sizeof(stream->rtcp_addr));
 562                                 } else {
 563                                         ms_warning("sdp has a strange a= line (%s) nb=%i", attr->a_att_value, nb);
 564                                 }
 565                         }
 566                 }
 567
 568                 /* read crypto lines if any */
 569                 if (stream->proto == SalProtoRtpSavp) {
 570                         int k, valid_count = 0;
 571
 572                         memset(&stream->crypto, 0, sizeof(stream->crypto));
 573                         for (k=0;valid_count < SAL_CRYPTO_ALGO_MAX && (attr=sdp_message_attribute_get(msg,i,k))!=NULL;k++){
 574                                 char tmp[256], tmp2[256];
 575                                 if (keywordcmp("crypto",attr->a_att_field)==0 && attr->a_att_value!=NULL){
 576                                         int nb = sscanf(attr->a_att_value, "%d %256s inline:%256s",
 577                                                 &stream->crypto[valid_count].tag,
 578                                                 tmp,
 579                                                 tmp2);
 580                                                 ms_message("Found valid crypto line (tag:%d algo:'%s' key:'%s'",
 581                                                                 stream->crypto[valid_count].tag,
 582                                                                 tmp,
 583                                                                 tmp2);
 584                                         if (nb == 3) {
 585                                                 if (strcmp(tmp, "AES_CM_128_HMAC_SHA1_80") == 0)
 586                                                         stream->crypto[valid_count].algo = AES_128_SHA1_80;
 587                                                 else if (strcmp(tmp, "AES_CM_128_HMAC_SHA1_32") == 0)
 588                                                         stream->crypto[valid_count].algo = AES_128_SHA1_32;
 589                                                 else {
 590                                                         ms_warning("Failed to parse crypto-algo: '%s'", tmp);
 591                                                         stream->crypto[valid_count].algo = 0;
 592                                                 }
 593                                                 if (stream->crypto[valid_count].algo) {
 594                                                         strncpy(stream->crypto[valid_count].master_key, tmp2, 41);
 595                                                         stream->crypto[valid_count].master_key[40] = '\0';
 596                                                         ms_message("Found valid crypto line (tag:%d algo:'%s' key:'%s'",
 597                                                                 stream->crypto[valid_count].tag,
 598                                                                 tmp,
 599                                                                 stream->crypto[valid_count].master_key);
 600                                                         valid_count++;
 601                                                 }
 602                                         } else {
 603                                                 ms_warning("sdp has a strange a= line (%s) nb=%i",attr->a_att_value,nb);
 604                                         }
 605                                 }
 606                         }
 607                         ms_message("Found: %d valid crypto lines", valid_count);
 608                 }
 609
 610                 /* Get ICE candidate attributes if any */
 611                 ice_ufrag = ice_pwd = NULL;
 612                 for (j = 0; (j < SAL_MEDIA_DESCRIPTION_MAX_ICE_CANDIDATES) && ((attr = sdp_message_attribute_get(msg, i, media_attribute_nb + j)) != NULL); j++) {
 613                         if ((keywordcmp("candidate", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 614                                 char ip[64];
 615                                 char foundation[32];
 616                                 char type[6];
 617                                 unsigned int priority;
 618                                 unsigned int componentID;
 619                                 unsigned int port;
 620                                 int nb;
 621
 622                                 /* Allocate the ICE session if it has not been done yet. */
 623                                 if (*ice_session == NULL) {
 624                                         *ice_session = ice_session_new();
 625                                         ice_session_just_created = TRUE;
 626                                 }
 627                                 /* Allocate the ICE check list if it has not been done yet. */
 628                                 if (ice_session_check_list(*ice_session, i) == NULL) {
 629                                         ice_session_add_check_list(*ice_session, ice_check_list_new());
 630                                 }
 631                                 nb = sscanf(attr->a_att_value, "%s %u UDP %u %s %u typ %s",
 632                                         foundation, &componentID, &priority, ip, &port, type);
 633                                 if (nb == 6) {
 634                                         char *default_ip = desc->addr;
 635                                         unsigned int default_port = stream->rtp_port;
 636                                         bool_t is_default_candidate = FALSE;
 637                                         if (componentID == 1) {
 638                                                 if ((stream->rtp_addr == NULL) || (stream->rtp_addr[0] == '\0')) default_ip = desc->addr;
 639                                                 else default_ip = stream->rtp_addr;
 640                                                 default_port = stream->rtp_port;
 641                                         } else if (componentID == 2) {
 642                                                 if ((stream->rtcp_addr == NULL) || (stream->rtcp_addr[0] == '\0')) default_ip = desc->addr;
 643                                                 else default_ip = stream->rtcp_addr;
 644                                                 default_port = stream->rtcp_port;
 645                                         }
 646                                         if ((port == default_port) && (strlen(ip) == strlen(default_ip)) && (strcmp(ip, default_ip) == 0)) is_default_candidate = TRUE;
 647                                         ice_add_remote_candidate(ice_session_check_list(*ice_session, i), type, ip, port, componentID, priority, foundation, is_default_candidate);
 648                                 }
 649                         } else if ((keywordcmp("remote-candidates", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 650                                 ice_remote_candidates = attr->a_att_value;
 651                         } else if ((keywordcmp("ice-ufrag", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 652                                 ice_ufrag = attr->a_att_value;
 653                         } else if ((keywordcmp("ice-pwd", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 654                                 ice_pwd = attr->a_att_value;
 655                         } else if (keywordcmp("ice-mismatch", attr->a_att_field) == 0) {
 656                                 ice_check_list_set_state(ice_session_check_list(*ice_session, i), ICL_Failed);
 657                         }
 658                 }
 659                 if ((*ice_session != NULL) && ice_session_check_list(*ice_session, i)) {
 660                         if (ice_remote_candidates != NULL) {
 661                                 char ip[64];
 662                                 unsigned int port;
 663                                 unsigned int componentID;
 664                                 int offset;
 665
 666                                 while (3 == sscanf(ice_remote_candidates, "%u %s %u%n", &componentID, ip, &port, &offset)) {
 667                                         if (componentID == 1) {
 668                                                 if ((stream->rtp_addr == NULL) || (stream->rtp_addr[0] == '\0')) rtp_addr = desc->addr;
 669                                                 else rtp_addr = stream->rtp_addr;
 670                                                 ice_add_losing_pair(ice_session_check_list(*ice_session, i), componentID, ip, port, rtp_addr, stream->rtp_port);
 671                                         } else if (componentID == 2) {
 672                                                 if ((stream->rtcp_addr == NULL) || (stream->rtcp_addr[0] == '\0')) rtp_addr = desc->addr;
 673                                                 else rtp_addr = stream->rtcp_addr;
 674                                                 ice_add_losing_pair(ice_session_check_list(*ice_session, i), componentID, ip, port, rtp_addr, stream->rtcp_port);
 675                                         }
 676                                         ice_remote_candidates += offset;
 677                                         if (ice_remote_candidates[offset] == ' ') ice_remote_candidates += 1;
 678                                 }
 679                         }
 680                         if ((ice_ufrag != NULL) && (ice_pwd != NULL)) {
 681                                 ice_check_list_set_remote_credentials(ice_session_check_list(*ice_session, i), ice_ufrag, ice_pwd);
 682                         }
 683                         if (stream->rtp_port == 0) {
 684                                 /* This stream has been deactivated by the peer, delete the check list. */
 685                                 ice_session_remove_check_list(*ice_session, ice_session_check_list(*ice_session, i));
 686                         }
 687                         ice_dump_candidates(ice_session_check_list(*ice_session, i));
 688                 }
 689         }
 690         desc->nstreams=i;
 691
 692         /* Get ICE remote ufrag and remote pwd */
 693         ice_ufrag = ice_pwd = NULL;
 694         for (i = 0; (i < SAL_MEDIA_DESCRIPTION_MAX_MESSAGE_ATTRIBUTES) && ((attr = sdp_message_attribute_get(msg, -1, i)) != NULL); i++) {
 695                 if ((keywordcmp("ice-ufrag", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 696                         ice_ufrag = attr->a_att_value;
 697                 } else if ((keywordcmp("ice-pwd", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 698                         ice_pwd = attr->a_att_value;
 699                 } else if (keywordcmp("ice-lite", attr->a_att_field) == 0) {
 700                         ice_lite = TRUE;
 701                 }
 702         }
 703         if (*ice_session != NULL) {
 704                 int nb_check_lists;
 705                 if (ice_session_just_created == TRUE) {
 706                         if (ice_lite == TRUE) {
 707                                 ice_session_set_role(*ice_session, IR_Controlling);
 708                         } else {
 709                                 ice_session_set_role(*ice_session, IR_Controlled);
 710                         }
 711                         ice_session_check_mismatch(*ice_session);
 712                 }
 713                 while ((nb_check_lists = ice_session_nb_check_lists(*ice_session)) > desc->nstreams) {
 714                         ice_session_remove_check_list(*ice_session, ice_session_check_list(*ice_session, nb_check_lists - 1));
 715                 }
 716                 if ((ice_ufrag != NULL) && (ice_pwd != NULL)) {
 717                         ice_session_set_remote_credentials(*ice_session, ice_ufrag, ice_pwd);
 718                         ice_dump_session(*ice_session);
 719                 }
 720                 if (((ice_session_just_created == FALSE) && ((ice_ufrag == NULL) || (ice_pwd == NULL)))
 721                         || (ice_session_state(*ice_session) == IS_Failed)) {
 722                         /* We started with ICE activated but the peer apparently do not support ICE, so stop using it. */
 723                         ice_session_destroy(*ice_session);
 724                         *ice_session = NULL;
 725                 }
 726         }
 727         return 0;
 728 }