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