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