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 *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                 const IceCandidate *candidate = NULL;
 149                 if (ice_session_state(ice_session) == IS_Completed) {
 150                         candidate = ice_check_list_nominated_valid_local_candidate(ice_session_check_list(ice_session, 0));
 151                 }
 152                 else {
 153                         candidate = ice_check_list_default_local_candidate(ice_session_check_list(ice_session, 0));
 154                 }
 155                 if (candidate != NULL) {
 156                         addr=candidate->taddr.ip;
 157                 }
 158         }
 159         if(!sal_media_description_has_dir (desc,SalStreamSendOnly))
 160         {
 161                 sdp_message_c_connection_add (local, -1,
 162                                 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 163                                                 osip_strdup (addr), NULL, NULL);
 164         }
 165         else
 166         {
 167                 sdp_message_c_connection_add (local, -1,
 168                                 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 169                                                 inet6 ? osip_strdup ("::0") : osip_strdup ("0.0.0.0"), NULL, NULL);
 170         }
 171         sdp_message_t_time_descr_add (local, osip_strdup ("0"), osip_strdup ("0"));
 172         if (desc->bandwidth>0) sdp_message_b_bandwidth_add (local, -1, osip_strdup ("AS"),
 173                         int_2char(desc->bandwidth));
 174         if ((ice_session != NULL) && (ice_session_check_list(ice_session, 0) != NULL)) {
 175                 char buffer[512];
 176                 switch (ice_session_state(ice_session)) {
 177                         case IS_Running:
 178                         case IS_Stopped:
 179                                 snprintf(buffer, sizeof(buffer), "%s", ice_session_local_pwd(ice_session));
 180                                 sdp_message_a_attribute_add(local, -1, osip_strdup("ice-pwd"), osip_strdup(buffer));
 181                                 snprintf(buffer, sizeof(buffer), "%s", ice_session_local_ufrag(ice_session));
 182                                 sdp_message_a_attribute_add(local, -1, osip_strdup("ice-ufrag"), osip_strdup(buffer));
 183                                 break;
 184                         case IS_Completed:
 185                                 sdp_message_a_attribute_add(local, -1, osip_strdup("nortpproxy"), osip_strdup("yes"));
 186                                 break;
 187                         default:
 188                                 break;
 189                 }
 190         }
 191
 192         return local;
 193 }
 194
 195
 196 static bool_t is_known_rtpmap(const PayloadType *pt){
 197         switch(payload_type_get_number(pt)){
 198                 case 0:
 199                 case 8:
 200                 case 3:
 201                 case 34:
 202                         return TRUE;
 203         }
 204         return FALSE;
 205 }
 206
 207 static void add_payload(sdp_message_t *msg, int line, const PayloadType *pt, bool_t strip_well_known_rtpmaps)
 208 {
 209         char attr[256];
 210         sdp_message_m_payload_add (msg,line, int_2char (payload_type_get_number(pt)));
 211
 212         if (!strip_well_known_rtpmaps || !is_known_rtpmap(pt)){
 213                 if (pt->channels>1)
 214                         snprintf (attr,sizeof(attr),"%i %s/%i/%i", payload_type_get_number(pt),
 215                                         pt->mime_type, pt->clock_rate,pt->channels);
 216                 else
 217                         snprintf (attr,sizeof(attr),"%i %s/%i", payload_type_get_number(pt),
 218                                         pt->mime_type, pt->clock_rate);
 219                 sdp_message_a_attribute_add (msg, line,
 220                                                  osip_strdup ("rtpmap"), osip_strdup(attr));
 221         }
 222
 223         if (pt->recv_fmtp != NULL)
 224         {
 225                 snprintf (attr,sizeof(attr),"%i %s", payload_type_get_number(pt),pt->recv_fmtp);
 226                 sdp_message_a_attribute_add (msg, line, osip_strdup ("fmtp"),
 227                                      osip_strdup(attr));
 228         }
 229 }
 230
 231 static void add_ice_candidates(sdp_message_t *msg, int lineno, const SalStreamDescription *desc, const IceCheckList *ice_cl)
 232 {
 233         char buffer[1024];
 234         const IceCandidate *candidate;
 235         int i;
 236
 237         if (ice_cl != NULL) {
 238                 for (i = 0; i < ms_list_size(ice_cl->local_candidates); i++) {
 239                         candidate = ms_list_nth_data(ice_cl->local_candidates, i);
 240                         snprintf(buffer, sizeof(buffer), "%s %d UDP %d %s %d typ %s",
 241                                 candidate->foundation, candidate->componentID, candidate->priority, candidate->taddr.ip, candidate->taddr.port, ice_candidate_type(candidate));
 242                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("candidate"), osip_strdup(buffer));
 243                 }
 244         }
 245 }
 246
 247
 248 static void add_line(sdp_message_t *msg, int lineno, const SalStreamDescription *desc, const IceCheckList *ice_cl){
 249         const char *mt=NULL;
 250         const MSList *elem;
 251         const char *addr;
 252         const char *dir="sendrecv";
 253         int port;
 254         bool_t strip_well_known_rtpmaps;
 255
 256         switch (desc->type) {
 257         case SalAudio:
 258                 mt="audio";
 259                 break;
 260         case SalVideo:
 261                 mt="video";
 262                 break;
 263         case SalOther:
 264                 mt=desc->typeother;
 265                 break;
 266         }
 267         addr=desc->addr;
 268         port=desc->port;
 269         if (ice_cl != NULL) {
 270                 const IceCandidate *candidate = NULL;
 271                 if (ice_check_list_state(ice_cl) == ICL_Completed) {
 272                         candidate = ice_check_list_nominated_valid_local_candidate(ice_cl);
 273                 } else {
 274                         candidate = ice_check_list_default_local_candidate(ice_cl);
 275                 }
 276                 if (candidate != NULL) {
 277                         addr=candidate->taddr.ip;
 278                         port=candidate->taddr.port;
 279                 }
 280         } else if (desc->candidates[0].addr[0]!='\0'){
 281                 addr=desc->candidates[0].addr;
 282                 port=desc->candidates[0].port;
 283         }
 284
 285         if (desc->proto == SalProtoRtpSavp) {
 286                 int i;
 287
 288                 sdp_message_m_media_add (msg, osip_strdup (mt),
 289                                          int_2char (port), NULL,
 290                                          osip_strdup ("RTP/SAVP"));
 291
 292                 /* add crypto lines */
 293                 for(i=0; i<SAL_CRYPTO_ALGO_MAX; i++) {
 294                         char buffer[1024];
 295                         switch (desc->crypto[i].algo) {
 296                                 case AES_128_SHA1_80:
 297                                         snprintf(buffer, 1024, "%d %s inline:%s",
 298                                                 desc->crypto[i].tag, "AES_CM_128_HMAC_SHA1_80", desc->crypto[i].master_key);
 299                                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("crypto"),
 300                                                 osip_strdup(buffer));
 301                                         break;
 302                                 case AES_128_SHA1_32:
 303                                         snprintf(buffer, 1024, "%d %s inline:%s",
 304                                                 desc->crypto[i].tag, "AES_CM_128_HMAC_SHA1_32", desc->crypto[i].master_key);
 305                                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("crypto"),
 306                                                 osip_strdup(buffer));
 307                                         break;
 308                                 case AES_128_NO_AUTH:
 309                                         ms_warning("Unsupported crypto suite: AES_128_NO_AUTH");
 310                                         break;
 311                                 case NO_CIPHER_SHA1_80:
 312                                         ms_warning("Unsupported crypto suite: NO_CIPHER_SHA1_80");
 313                                         break;
 314                                 default:
 315                                         i = SAL_CRYPTO_ALGO_MAX;
 316                         }
 317                 }
 318
 319         } else {
 320                 sdp_message_m_media_add (msg, osip_strdup (mt),
 321                                          int_2char (port), NULL,
 322                                          osip_strdup ("RTP/AVP"));
 323
 324         }
 325
 326         /*only add a c= line within the stream description if address are differents*/
 327         if (strcmp(addr,sdp_message_c_addr_get(msg, -1, 0))!=0){
 328                 bool_t inet6;
 329                 if (strchr(addr,':')!=NULL){
 330                         inet6=TRUE;
 331                 }else inet6=FALSE;
 332                 sdp_message_c_connection_add (msg, lineno,
 333                               osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 334                               osip_strdup (addr), NULL, NULL);
 335         }
 336
 337         if (desc->bandwidth>0) sdp_message_b_bandwidth_add (msg, lineno, osip_strdup ("AS"),
 338                                      int_2char(desc->bandwidth));
 339         if (desc->ptime>0) sdp_message_a_attribute_add(msg,lineno,osip_strdup("ptime"),
 340                                 int_2char(desc->ptime));
 341         strip_well_known_rtpmaps=ms_list_size(desc->payloads)>5;
 342         if (desc->payloads){
 343                 for(elem=desc->payloads;elem!=NULL;elem=elem->next){
 344                         add_payload(msg, lineno, (PayloadType*)elem->data,strip_well_known_rtpmaps);
 345                 }
 346         }else{
 347                 /* to comply with SDP we cannot have an empty payload type number list */
 348                 /* as it happens only when mline is declined with a zero port, it does not matter to put whatever codec*/
 349                 sdp_message_m_payload_add (msg,lineno, int_2char (0));
 350         }
 351         switch(desc->dir){
 352                 case SalStreamSendRecv:
 353                         /*dir="sendrecv";*/
 354                         dir=NULL;
 355                 break;
 356                 case SalStreamRecvOnly:
 357                         dir="recvonly";
 358                         break;
 359                 case SalStreamSendOnly:
 360                         dir="sendonly";
 361                         break;
 362                 case SalStreamInactive:
 363                         dir="inactive";
 364                         break;
 365         }
 366         if (dir) sdp_message_a_attribute_add (msg, lineno, osip_strdup (dir),NULL);
 367         if (ice_check_list_state(ice_cl) == ICL_Running) {
 368                 add_ice_candidates(msg, lineno, desc, ice_cl);
 369         }
 370 }
 371
 372
 373 sdp_message_t *media_description_to_sdp(const SalMediaDescription *desc, const IceSession *ice_session){
 374         IceCheckList *ice_cl = NULL;
 375         int i;
 376         sdp_message_t *msg=create_generic_sdp(desc, ice_session);
 377         for(i=0;i<desc->nstreams;++i){
 378                 if (ice_session != NULL) ice_cl = ice_session_check_list(ice_session, i);
 379                 else ice_cl = NULL;
 380                 add_line(msg,i,&desc->streams[i], ice_cl);
 381         }
 382         return msg;
 383 }
 384
 385 static int payload_type_fill_from_rtpmap(PayloadType *pt, const char *rtpmap){
 386         if (rtpmap==NULL){
 387                 PayloadType *refpt=rtp_profile_get_payload(&av_profile,payload_type_get_number(pt));
 388                 if (refpt){
 389                         pt->mime_type=ms_strdup(refpt->mime_type);
 390                         pt->clock_rate=refpt->clock_rate;
 391                 }else{
 392                         ms_error("payload number %i has no rtpmap and is unknown in AV Profile, ignored.",
 393                             payload_type_get_number(pt));
 394                         return -1;
 395                 }
 396         }else{
 397                 char *mime=ms_strdup(rtpmap);
 398                 char *p=strchr(mime,'/');
 399                 if (p){
 400                         char *chans;
 401                         *p='\0';
 402                         p++;
 403                         chans=strchr(p,'/');
 404                         if (chans){
 405                                 *chans='\0';
 406                                 chans++;
 407                                 pt->channels=atoi(chans);
 408                         }else pt->channels=1;
 409                         pt->clock_rate=atoi(p);
 410                 }
 411                 pt->mime_type=mime;
 412         }
 413         return 0;
 414 }
 415
 416 int sdp_to_media_description(sdp_message_t *msg, SalMediaDescription *desc, IceSession **ice_session){
 417         int i,j;
 418         const char *mtype,*proto,*port,*addr,*number;
 419         const char *ice_ufrag, *ice_pwd;
 420         sdp_bandwidth_t *sbw=NULL;
 421         sdp_attribute_t *attr;
 422         int media_attribute_nb;
 423         bool_t ice_session_just_created = FALSE;
 424         bool_t ice_lite = FALSE;
 425
 426         addr=sdp_message_c_addr_get (msg, -1, 0);
 427         if (addr)
 428                 strncpy(desc->addr,addr,sizeof(desc->addr));
 429         for(j=0;(sbw=sdp_message_bandwidth_get(msg,-1,j))!=NULL;++j){
 430                 if (strcasecmp(sbw->b_bwtype,"AS")==0) desc->bandwidth=atoi(sbw->b_bandwidth);
 431         }
 432
 433         /* for each m= line */
 434         for (i=0; !sdp_message_endof_media (msg, i) && i<SAL_MEDIA_DESCRIPTION_MAX_STREAMS; i++)
 435         {
 436                 SalStreamDescription *stream=&desc->streams[i];
 437
 438                 memset(stream,0,sizeof(*stream));
 439                 mtype = sdp_message_m_media_get(msg, i);
 440                 proto = sdp_message_m_proto_get (msg, i);
 441                 port = sdp_message_m_port_get(msg, i);
 442                 stream->proto=SalProtoUnknown;
 443                 if (proto){
 444                         if (strcasecmp(proto,"RTP/AVP")==0)
 445                                 stream->proto=SalProtoRtpAvp;
 446                         else if (strcasecmp(proto,"RTP/SAVP")==0){
 447                                 stream->proto=SalProtoRtpSavp;
 448                         }
 449                 }
 450                 addr = sdp_message_c_addr_get (msg, i, 0);
 451                 if (addr != NULL)
 452                         strncpy(stream->addr,addr,sizeof(stream->addr));
 453                 if (port)
 454                         stream->port=atoi(port);
 455
 456                 stream->ptime=_sdp_message_get_a_ptime(msg,i);
 457                 if (strcasecmp("audio", mtype) == 0){
 458                         stream->type=SalAudio;
 459                 }else if (strcasecmp("video", mtype) == 0){
 460                         stream->type=SalVideo;
 461                 }else {
 462                         stream->type=SalOther;
 463                         strncpy(stream->typeother,mtype,sizeof(stream->typeother)-1);
 464                 }
 465                 for(j=0;(sbw=sdp_message_bandwidth_get(msg,i,j))!=NULL;++j){
 466                         if (strcasecmp(sbw->b_bwtype,"AS")==0) stream->bandwidth=atoi(sbw->b_bandwidth);
 467                 }
 468                 stream->dir=_sdp_message_get_mline_dir(msg,i);
 469                 media_attribute_nb = 0;
 470                 /* for each payload type */
 471                 for (j=0;((number=sdp_message_m_payload_get (msg, i,j)) != NULL); j++){
 472                         const char *rtpmap,*fmtp;
 473                         int ptn=atoi(number);
 474                         PayloadType *pt=payload_type_new();
 475                         payload_type_set_number(pt,ptn);
 476                         /* get the rtpmap associated to this codec, if any */
 477                         rtpmap=sdp_message_a_attr_value_get_with_pt(msg, i,ptn,"rtpmap");
 478                         if (rtpmap != NULL) media_attribute_nb++;
 479                         if (payload_type_fill_from_rtpmap(pt,rtpmap)==0){
 480                                 /* get the fmtp, if any */
 481                                 fmtp=sdp_message_a_attr_value_get_with_pt(msg, i, ptn,"fmtp");
 482                                 if (fmtp != NULL) media_attribute_nb++;
 483                                 payload_type_set_send_fmtp(pt,fmtp);
 484                                 stream->payloads=ms_list_append(stream->payloads,pt);
 485                                 ms_message("Found payload %s/%i fmtp=%s",pt->mime_type,pt->clock_rate,
 486                                         pt->send_fmtp ? pt->send_fmtp : "");
 487                         }
 488                 }
 489
 490                 /* read crypto lines if any */
 491                 if (stream->proto == SalProtoRtpSavp) {
 492                         int k, valid_count = 0;
 493
 494                         memset(&stream->crypto, 0, sizeof(stream->crypto));
 495                         for (k=0;valid_count < SAL_CRYPTO_ALGO_MAX && (attr=sdp_message_attribute_get(msg,i,k))!=NULL;k++){
 496                                 char tmp[256], tmp2[256];
 497                                 if (keywordcmp("crypto",attr->a_att_field)==0 && attr->a_att_value!=NULL){
 498                                         int nb = sscanf(attr->a_att_value, "%d %256s inline:%256s",
 499                                                 &stream->crypto[valid_count].tag,
 500                                                 tmp,
 501                                                 tmp2);
 502                                                 ms_message("Found valid crypto line (tag:%d algo:'%s' key:'%s'",
 503                                                                 stream->crypto[valid_count].tag,
 504                                                                 tmp,
 505                                                                 tmp2);
 506                                         if (nb == 3) {
 507                                                 if (strcmp(tmp, "AES_CM_128_HMAC_SHA1_80") == 0)
 508                                                         stream->crypto[valid_count].algo = AES_128_SHA1_80;
 509                                                 else if (strcmp(tmp, "AES_CM_128_HMAC_SHA1_32") == 0)
 510                                                         stream->crypto[valid_count].algo = AES_128_SHA1_32;
 511                                                 else {
 512                                                         ms_warning("Failed to parse crypto-algo: '%s'", tmp);
 513                                                         stream->crypto[valid_count].algo = 0;
 514                                                 }
 515                                                 if (stream->crypto[valid_count].algo) {
 516                                                         strncpy(stream->crypto[valid_count].master_key, tmp2, 41);
 517                                                         stream->crypto[valid_count].master_key[40] = '\0';
 518                                                         ms_message("Found valid crypto line (tag:%d algo:'%s' key:'%s'",
 519                                                                 stream->crypto[valid_count].tag,
 520                                                                 tmp,
 521                                                                 stream->crypto[valid_count].master_key);
 522                                                         valid_count++;
 523                                                 }
 524                                         } else {
 525                                                 ms_warning("sdp has a strange a= line (%s) nb=%i",attr->a_att_value,nb);
 526                                         }
 527                                 }
 528                         }
 529                         ms_message("Found: %d valid crypto lines", valid_count);
 530                 }
 531
 532                 /* Get ICE candidate attributes if any */
 533                 ice_ufrag = ice_pwd = NULL;
 534                 for (j = 0; (j < SAL_MEDIA_DESCRIPTION_MAX_ICE_CANDIDATES) && ((attr = sdp_message_attribute_get(msg, i, media_attribute_nb + j)) != NULL); j++) {
 535                         if ((keywordcmp("candidate", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 536                                 char ip[64];
 537                                 char foundation[32];
 538                                 char type[6];
 539                                 unsigned int priority;
 540                                 unsigned int componentID;
 541                                 unsigned int port;
 542                                 int nb;
 543
 544                                 /* Allocate the ICE session if it has not been done yet. */
 545                                 if (*ice_session == NULL) {
 546                                         *ice_session = ice_session_new();
 547                                         ice_session_just_created = TRUE;
 548                                 }
 549                                 /* Allocate the ICE check list if it has not been done yet. */
 550                                 if (ice_session_check_list(*ice_session, i) == NULL) {
 551                                         ice_session_add_check_list(*ice_session, ice_check_list_new());
 552                                 }
 553                                 nb = sscanf(attr->a_att_value, "%s %u UDP %u %s %u typ %s",
 554                                         foundation, &componentID, &priority, ip, &port, type);
 555                                 if (nb == 6) {
 556                                         ice_add_remote_candidate(ice_session_check_list(*ice_session, i), type, ip, port, componentID, priority, foundation);
 557                                 }
 558                         } else if ((keywordcmp("ice-ufrag", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 559                                 ice_ufrag = attr->a_att_value;
 560                         } else if ((keywordcmp("ice-pwd", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 561                                 ice_pwd = attr->a_att_value;
 562                         }
 563                 }
 564                 if ((*ice_session != NULL) && ice_session_check_list(*ice_session, i)) {
 565                         if ((ice_ufrag != NULL) && (ice_pwd != NULL)) {
 566                                 ice_check_list_set_remote_credentials(ice_session_check_list(*ice_session, i), ice_ufrag, ice_pwd);
 567                         }
 568                         ice_dump_candidates(ice_session_check_list(*ice_session, i));
 569                 }
 570         }
 571         desc->nstreams=i;
 572
 573         /* Get ICE remote ufrag and remote pwd */
 574         ice_ufrag = ice_pwd = NULL;
 575         for (i = 0; (i < SAL_MEDIA_DESCRIPTION_MAX_MESSAGE_ATTRIBUTES) && ((attr = sdp_message_attribute_get(msg, -1, i)) != NULL); i++) {
 576                 if ((keywordcmp("ice-ufrag", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 577                         ice_ufrag = attr->a_att_value;
 578                 } else if ((keywordcmp("ice-pwd", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 579                         ice_pwd = attr->a_att_value;
 580                 } else if (keywordcmp("ice-lite", attr->a_att_field) == 0) {
 581                         ice_lite = TRUE;
 582                 }
 583         }
 584         if (*ice_session != NULL) {
 585                 if (ice_session_just_created == TRUE) {
 586                         if (ice_lite == TRUE) {
 587                                 ice_session_set_role(*ice_session, IR_Controlling);
 588                         } else {
 589                                 ice_session_set_role(*ice_session, IR_Controlled);
 590                         }
 591                 }
 592                 if ((ice_ufrag != NULL) && (ice_pwd != NULL)) {
 593                         ice_session_set_remote_credentials(*ice_session, ice_ufrag, ice_pwd);
 594                         ice_dump_session(*ice_session);
 595                 }
 596         }
 597         return 0;
 598 }