src/core/sdpmsg.c

   1 /**
   2  * @file sdpmsg.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2013 SIPE Project <http://sipe.sourceforge.net/>
   7  * Copyright (C) 2010 Jakub Adam <jakub.adam@ktknet.cz>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include <glib.h>
  29
  30 #include "sipe-backend.h"
  31 #include "sdpmsg.h"
  32 #include "sipe-utils.h"
  33
  34 static gboolean
  35 append_attribute(struct sdpmedia *media, gchar *attr)
  36 {
  37         gchar **parts = g_strsplit(attr + 2, ":", 2);
  38
  39         if(!parts[0]) {
  40                 g_strfreev(parts);
  41                 return FALSE;
  42         }
  43
  44         media->attributes = sipe_utils_nameval_add(media->attributes,
  45                                                    parts[0],
  46                                                    parts[1] ? parts[1] : "");
  47         g_strfreev(parts);
  48         return TRUE;
  49 }
  50
  51 static gboolean
  52 parse_attributes(struct sdpmsg *smsg, gchar *msg) {
  53         gchar           **lines = g_strsplit(msg, "\r\n", 0);
  54         gchar           **ptr = lines;
  55
  56         while (*ptr != NULL) {
  57                 if (g_str_has_prefix(*ptr, "o=")) {
  58                         gchar **parts = g_strsplit(*ptr + 2, " ", 6);
  59                         smsg->ip = g_strdup(parts[5]);
  60                         g_strfreev(parts);
  61                 } else if (g_str_has_prefix(*ptr, "m=")) {
  62                         gchar **parts = g_strsplit(*ptr + 2, " ", 3);
  63                         struct sdpmedia *media = g_new0(struct sdpmedia, 1);
  64
  65                         smsg->media = g_slist_append(smsg->media, media);
  66
  67                         media->name = g_strdup(parts[0]);
  68                         media->port = atoi(parts[1]);
  69
  70                         g_strfreev(parts);
  71
  72                         while (*(++ptr) && !g_str_has_prefix(*ptr, "m=")) {
  73
  74                                 if (g_str_has_prefix(*ptr, "a=")) {
  75                                         if (!append_attribute(media, *ptr)) {
  76                                                 g_strfreev(lines);
  77                                                 return FALSE;
  78                                         }
  79                                 }
  80                         }
  81                         continue;
  82                 }
  83
  84                 ++ptr;
  85         }
  86
  87         g_strfreev(lines);
  88
  89         return TRUE;
  90 }
  91
  92 static struct sdpcandidate * sdpcandidate_copy(struct sdpcandidate *candidate);
  93 static void sdpcandidate_free(struct sdpcandidate *candidate);
  94
  95 static SipeComponentType
  96 parse_component(const gchar *str)
  97 {
  98         switch (atoi(str)) {
  99                 case 1: return  SIPE_COMPONENT_RTP;
 100                 case 2: return  SIPE_COMPONENT_RTCP;
 101                 default: return SIPE_COMPONENT_NONE;
 102         }
 103 }
 104
 105 static gchar *
 106 base64_pad(const gchar* str)
 107 {
 108         size_t str_len = strlen(str);
 109         int mod = str_len % 4;
 110
 111         if (mod > 0) {
 112                 gchar *result = NULL;
 113                 int pad = 4 - mod;
 114                 gchar *ptr = result = g_malloc(str_len + pad + 1);
 115
 116                 memcpy(ptr, str, str_len);
 117                 ptr += str_len;
 118                 memset(ptr, '=', pad);
 119                 ptr += pad;
 120                 *ptr = '\0';
 121
 122                 return result;
 123         } else
 124                 return g_strdup(str);
 125 }
 126
 127 static GSList *
 128 parse_append_candidate_draft_6(gchar **tokens, GSList *candidates)
 129 {
 130         struct sdpcandidate *candidate = g_new0(struct sdpcandidate, 1);
 131
 132         candidate->username = base64_pad(tokens[0]);
 133         candidate->component = parse_component(tokens[1]);
 134         candidate->password = base64_pad(tokens[2]);
 135
 136         if (sipe_strequal(tokens[3], "UDP"))
 137                 candidate->protocol = SIPE_NETWORK_PROTOCOL_UDP;
 138         else if (sipe_strequal(tokens[3], "TCP"))
 139                 candidate->protocol = SIPE_NETWORK_PROTOCOL_TCP_ACTIVE;
 140         else {
 141                 sdpcandidate_free(candidate);
 142                 return candidates;
 143         }
 144
 145         candidate->priority = atoi(tokens[4] + 2);
 146         candidate->ip = g_strdup(tokens[5]);
 147         candidate->port = atoi(tokens[6]);
 148
 149         candidates = g_slist_append(candidates, candidate);
 150
 151         // draft 6 candidates are both active and passive
 152         if (candidate->protocol == SIPE_NETWORK_PROTOCOL_TCP_ACTIVE) {
 153                 candidate = sdpcandidate_copy(candidate);
 154                 candidate->protocol = SIPE_NETWORK_PROTOCOL_TCP_PASSIVE;
 155                 candidates = g_slist_append(candidates, candidate);
 156         }
 157
 158         return candidates;
 159 }
 160
 161 static GSList *
 162 parse_append_candidate_rfc_5245(gchar **tokens, GSList *candidates)
 163 {
 164         struct sdpcandidate *candidate = g_new0(struct sdpcandidate, 1);
 165
 166         candidate->foundation = g_strdup(tokens[0]);
 167         candidate->component = parse_component(tokens[1]);
 168
 169         if (sipe_strequal(tokens[2], "UDP"))
 170                 candidate->protocol = SIPE_NETWORK_PROTOCOL_UDP;
 171         else if (sipe_strequal(tokens[2], "TCP-ACT"))
 172                 candidate->protocol = SIPE_NETWORK_PROTOCOL_TCP_ACTIVE;
 173         else if (sipe_strequal(tokens[2], "TCP-PASS"))
 174                 candidate->protocol = SIPE_NETWORK_PROTOCOL_TCP_PASSIVE;
 175         else {
 176                 sdpcandidate_free(candidate);
 177                 return candidates;
 178         }
 179
 180         candidate->priority = atoi(tokens[3]);
 181         candidate->ip = g_strdup(tokens[4]);
 182         candidate->port = atoi(tokens[5]);
 183
 184         if (sipe_strequal(tokens[7], "host"))
 185                 candidate->type = SIPE_CANDIDATE_TYPE_HOST;
 186         else if (sipe_strequal(tokens[7], "relay"))
 187                 candidate->type = SIPE_CANDIDATE_TYPE_RELAY;
 188         else if (sipe_strequal(tokens[7], "srflx"))
 189                 candidate->type = SIPE_CANDIDATE_TYPE_SRFLX;
 190         else if (sipe_strequal(tokens[7], "prflx"))
 191                 candidate->type = SIPE_CANDIDATE_TYPE_PRFLX;
 192         else {
 193                 sdpcandidate_free(candidate);
 194                 return candidates;
 195         }
 196
 197         candidates = g_slist_append(candidates, candidate);
 198
 199         // TCP-ACT candidates are both active and passive
 200         if (candidate->protocol == SIPE_NETWORK_PROTOCOL_TCP_ACTIVE) {
 201                 candidate = sdpcandidate_copy(candidate);
 202                 candidate->protocol = SIPE_NETWORK_PROTOCOL_TCP_PASSIVE;
 203                 candidates = g_slist_append(candidates, candidate);
 204         }
 205         return candidates;
 206 }
 207
 208 static GSList *
 209 parse_candidates(GSList *attrs, SipeIceVersion *ice_version)
 210 {
 211         GSList *candidates = NULL;
 212         const gchar *attr;
 213         int i = 0;
 214
 215         while ((attr = sipe_utils_nameval_find_instance(attrs, "candidate", i++))) {
 216                 gchar **tokens = g_strsplit_set(attr, " ", 0);
 217
 218                 if (sipe_strequal(tokens[6], "typ")) {
 219                         candidates = parse_append_candidate_rfc_5245(tokens, candidates);
 220                         if (candidates)
 221                                 *ice_version = SIPE_ICE_RFC_5245;
 222                 } else {
 223                         candidates = parse_append_candidate_draft_6(tokens, candidates);
 224                         if (candidates)
 225                                 *ice_version = SIPE_ICE_DRAFT_6;
 226                 }
 227
 228                 g_strfreev(tokens);
 229         }
 230
 231         if (!candidates)
 232                 *ice_version = SIPE_ICE_NO_ICE;
 233
 234         if (*ice_version == SIPE_ICE_RFC_5245) {
 235                 const gchar *username = sipe_utils_nameval_find(attrs, "ice-ufrag");
 236                 const gchar *password = sipe_utils_nameval_find(attrs, "ice-pwd");
 237
 238                 if (username && password) {
 239                         GSList *i;
 240                         for (i = candidates; i; i = i->next) {
 241                                 struct sdpcandidate *c = i->data;
 242                                 c->username = g_strdup(username);
 243                                 c->password = g_strdup(password);
 244                         }
 245                 }
 246         }
 247
 248         return candidates;
 249 }
 250
 251 static GSList *
 252 create_legacy_candidates(gchar *ip, guint16 port)
 253 {
 254         struct sdpcandidate *candidate;
 255         GSList *candidates = NULL;
 256
 257         candidate = g_new0(struct sdpcandidate, 1);
 258         candidate->foundation = g_strdup("1");
 259         candidate->component = SIPE_COMPONENT_RTP;
 260         candidate->type = SIPE_CANDIDATE_TYPE_HOST;
 261         candidate->protocol = SIPE_NETWORK_PROTOCOL_UDP;
 262         candidate->ip = g_strdup(ip);
 263         candidate->port = port;
 264
 265         candidates = g_slist_append(candidates, candidate);
 266
 267         candidate = g_new0(struct sdpcandidate, 1);
 268         candidate->foundation = g_strdup("1");
 269         candidate->component = SIPE_COMPONENT_RTCP;
 270         candidate->type = SIPE_CANDIDATE_TYPE_HOST;
 271         candidate->protocol = SIPE_NETWORK_PROTOCOL_UDP;
 272         candidate->ip = g_strdup(ip);
 273         candidate->port = port + 1;
 274
 275         candidates = g_slist_append(candidates, candidate);
 276
 277         return candidates;
 278 }
 279
 280 static GSList *
 281 parse_codecs(GSList *attrs, SipeMediaType type)
 282 {
 283         int i = 0;
 284         const gchar *attr;
 285         GSList *codecs = NULL;
 286
 287         while ((attr = sipe_utils_nameval_find_instance(attrs, "rtpmap", i++))) {
 288                 struct sdpcodec *codec = g_new0(struct sdpcodec, 1);
 289                 gchar **tokens = g_strsplit_set(attr, " /", 3);
 290
 291                 int j = 0;
 292                 const gchar* params;
 293
 294                 codec->id = atoi(tokens[0]);
 295                 codec->name = g_strdup(tokens[1]);
 296                 codec->clock_rate = atoi(tokens[2]);
 297                 codec->type = type;
 298
 299                 // TODO: more secure and effective implementation
 300                 while((params = sipe_utils_nameval_find_instance(attrs, "fmtp", j++))) {
 301                         gchar **tokens = g_strsplit_set(params, " ", 0);
 302                         gchar **next = tokens + 1;
 303
 304                         if (atoi(tokens[0]) == codec->id) {
 305                                 while (*next) {
 306                                         gchar name[50];
 307                                         gchar value[50];
 308
 309                                         if (sscanf(*next, "%[a-zA-Z0-9]=%s", name, value) == 2)
 310                                                 codec->parameters = sipe_utils_nameval_add(codec->parameters, name, value);
 311
 312                                         ++next;
 313                                 }
 314                         }
 315
 316                         g_strfreev(tokens);
 317                 }
 318
 319                 codecs = g_slist_append(codecs, codec);
 320                 g_strfreev(tokens);
 321         }
 322
 323         return codecs;
 324 }
 325
 326 struct sdpmsg *
 327 sdpmsg_parse_msg(gchar *msg)
 328 {
 329         struct sdpmsg *smsg = g_new0(struct sdpmsg, 1);
 330         GSList *i;
 331
 332         if (!parse_attributes(smsg, msg)) {
 333                 sdpmsg_free(smsg);
 334                 return NULL;
 335         }
 336
 337         for (i = smsg->media; i; i = i->next) {
 338                 struct sdpmedia *media = i->data;
 339                 SipeMediaType type;
 340
 341                 media->candidates = parse_candidates(media->attributes,
 342                                                      &smsg->ice_version);
 343
 344                 if (!media->candidates && media->port != 0) {
 345                         // No a=candidate in SDP message, this seems to be MSOC 2005
 346                         media->candidates = create_legacy_candidates(smsg->ip, media->port);
 347                 }
 348
 349                 if (sipe_strequal(media->name, "audio"))
 350                         type = SIPE_MEDIA_AUDIO;
 351                 else if (sipe_strequal(media->name, "video"))
 352                         type = SIPE_MEDIA_VIDEO;
 353                 else {
 354                         // Unknown media type
 355                         sdpmsg_free(smsg);
 356                         return NULL;
 357                 }
 358
 359                 media->codecs = parse_codecs(media->attributes, type);
 360         }
 361
 362         return smsg;
 363 }
 364
 365 static gchar *
 366 codecs_to_string(GSList *codecs)
 367 {
 368         GString *result = g_string_new(NULL);
 369
 370         for (; codecs; codecs = codecs->next) {
 371                 struct sdpcodec *c = codecs->data;
 372                 GSList *params = c->parameters;
 373
 374                 g_string_append_printf(result,
 375                                        "a=rtpmap:%d %s/%d\r\n",
 376                                        c->id,
 377                                        c->name,
 378                                        c->clock_rate);
 379
 380                 if (params) {
 381                         GString *param_str = g_string_new(NULL);
 382                         int written_params = 0;
 383
 384                         g_string_append_printf(param_str, "a=fmtp:%d", c->id);
 385
 386                         for (; params; params = params->next) {
 387                                 struct sipnameval* par = params->data;
 388                                 if (sipe_strequal(par->name, "farsight-send-profile")) {
 389                                         // Lync AVMCU doesn't like this property.
 390                                         continue;
 391                                 }
 392
 393                                 g_string_append_printf(param_str, " %s=%s",
 394                                                        par->name, par->value);
 395                                 ++written_params;
 396                         }
 397
 398                         g_string_append(param_str, "\r\n");
 399
 400                         if (written_params > 0) {
 401                                 g_string_append(result, param_str->str);
 402                         }
 403
 404                         g_string_free(param_str, TRUE);
 405                 }
 406         }
 407
 408         return g_string_free(result, FALSE);
 409 }
 410
 411 static gchar *
 412 codec_ids_to_string(GSList *codecs)
 413 {
 414         GString *result = g_string_new(NULL);
 415
 416         for (; codecs; codecs = codecs->next) {
 417                 struct sdpcodec *c = codecs->data;
 418                 g_string_append_printf(result, " %d", c->id);
 419         }
 420
 421         return g_string_free(result, FALSE);
 422 }
 423
 424 static gchar *
 425 base64_unpad(const gchar *str)
 426 {
 427         gchar *result = g_strdup(str);
 428         gchar *ptr;
 429
 430         for (ptr = result + strlen(result); ptr != result; --ptr) {
 431                 if (*(ptr - 1) != '=') {
 432                         *ptr = '\0';
 433                         break;
 434                 }
 435         }
 436
 437         return result;
 438 }
 439
 440 static gchar *
 441 candidates_to_string(GSList *candidates, SipeIceVersion ice_version)
 442 {
 443         GString *result = g_string_new("");
 444         GSList *i;
 445         GSList *processed_tcp_candidates = NULL;
 446
 447         for (i = candidates; i; i = i->next) {
 448                 struct sdpcandidate *c = i->data;
 449                 const gchar *protocol;
 450                 const gchar *type;
 451                 gchar *related = NULL;
 452
 453                 if (ice_version == SIPE_ICE_RFC_5245) {
 454
 455                         switch (c->protocol) {
 456                                 case SIPE_NETWORK_PROTOCOL_TCP_ACTIVE:
 457                                         protocol = "TCP-ACT";
 458                                         break;
 459                                 case SIPE_NETWORK_PROTOCOL_TCP_PASSIVE:
 460                                         protocol = "TCP-PASS";
 461                                         break;
 462                                 case SIPE_NETWORK_PROTOCOL_UDP:
 463                                         protocol = "UDP";
 464                                         break;
 465                                 default:
 466                                         /* error unknown/unsupported type */
 467                                         protocol = "UNKNOWN";
 468                                         break;
 469                         }
 470
 471                         switch (c->type) {
 472                                 case SIPE_CANDIDATE_TYPE_HOST:
 473                                         type = "host";
 474                                         break;
 475                                 case SIPE_CANDIDATE_TYPE_RELAY:
 476                                         type = "relay";
 477                                         related = g_strdup_printf("raddr %s rport %d ",
 478                                                                   c->base_ip,
 479                                                                   c->base_port);
 480                                         break;
 481                                 case SIPE_CANDIDATE_TYPE_SRFLX:
 482                                         type = "srflx";
 483                                         related = g_strdup_printf("raddr %s rport %d",
 484                                                                   c->base_ip,
 485                                                                   c->base_port);
 486                                         break;
 487                                 case SIPE_CANDIDATE_TYPE_PRFLX:
 488                                         type = "prflx";
 489                                         break;
 490                                 default:
 491                                         /* error unknown/unsupported type */
 492                                         type = "unknown";
 493                                         break;
 494                         }
 495
 496                         g_string_append_printf(result,
 497                                                "a=candidate:%s %u %s %u %s %d typ %s %s\r\n",
 498                                                c->foundation,
 499                                                c->component,
 500                                                protocol,
 501                                                c->priority,
 502                                                c->ip,
 503                                                c->port,
 504                                                type,
 505                                                related ? related : "");
 506                         g_free(related);
 507
 508                 } else if (ice_version == SIPE_ICE_DRAFT_6) {
 509                         gchar *username;
 510                         gchar *password;
 511
 512                         switch (c->protocol) {
 513                                 case SIPE_NETWORK_PROTOCOL_TCP_ACTIVE:
 514                                 case SIPE_NETWORK_PROTOCOL_TCP_PASSIVE: {
 515                                         GSList *prev_cand = processed_tcp_candidates;
 516                                         for (; prev_cand; prev_cand = prev_cand->next) {
 517                                                 struct sdpcandidate *c2 = (struct sdpcandidate *)prev_cand->data;
 518
 519                                                 if (sipe_strequal(c->ip, c2->ip) &&
 520                                                     c->component == c2->component) {
 521                                                         break;
 522                                                 }
 523                                         }
 524
 525                                         if (prev_cand) {
 526                                                 protocol = NULL;
 527                                         } else {
 528                                                 protocol = "TCP";
 529                                                 processed_tcp_candidates =
 530                                                         g_slist_append(processed_tcp_candidates, c);
 531                                         }
 532                                         break;
 533                                 }
 534                                 case SIPE_NETWORK_PROTOCOL_UDP:
 535                                         protocol = "UDP";
 536                                         break;
 537                                 default:
 538                                         /* unknown/unsupported type, ignore */
 539                                         protocol = NULL;
 540                                         break;
 541                         }
 542
 543                         if (!protocol) {
 544                                 continue;
 545                         }
 546
 547                         username = base64_unpad(c->username);
 548                         password = base64_unpad(c->password);
 549
 550                         g_string_append_printf(result,
 551                                                "a=candidate:%s %u %s %s 0.%u %s %d\r\n",
 552                                                username,
 553                                                c->component,
 554                                                password,
 555                                                protocol,
 556                                                c->priority,
 557                                                c->ip,
 558                                                c->port);
 559
 560                         g_free(username);
 561                         g_free(password);
 562                 }
 563         }
 564
 565         g_slist_free(processed_tcp_candidates);
 566
 567         return g_string_free(result, FALSE);
 568 }
 569
 570 static gchar *
 571 remote_candidates_to_string(GSList *candidates, SipeIceVersion ice_version)
 572 {
 573         GString *result = g_string_new("");
 574
 575         if (candidates) {
 576                 if (ice_version == SIPE_ICE_RFC_5245) {
 577                         GSList *i;
 578                         g_string_append(result, "a=remote-candidates:");
 579
 580                         for (i = candidates; i; i = i->next) {
 581                                 struct sdpcandidate *c = i->data;
 582                                 g_string_append_printf(result, "%u %s %u ",
 583                                                        c->component, c->ip, c->port);
 584                         }
 585
 586                         g_string_append(result, "\r\n");
 587                 } else if (ice_version == SIPE_ICE_DRAFT_6) {
 588                         struct sdpcandidate *c = candidates->data;
 589                         g_string_append_printf(result, "a=remote-candidate:%s\r\n",
 590                                                c->username);
 591                 }
 592         }
 593
 594         return g_string_free(result, FALSE);
 595 }
 596
 597 static gchar *
 598 attributes_to_string(GSList *attributes)
 599 {
 600         GString *result = g_string_new("");
 601
 602         for (; attributes; attributes = attributes->next) {
 603                 struct sipnameval *a = attributes->data;
 604                 g_string_append_printf(result, "a=%s", a->name);
 605                 if (!sipe_strequal(a->value, ""))
 606                         g_string_append_printf(result, ":%s", a->value);
 607                 g_string_append(result, "\r\n");
 608         }
 609
 610         return g_string_free(result, FALSE);
 611 }
 612
 613 static gchar *
 614 media_to_string(const struct sdpmsg *msg, const struct sdpmedia *media)
 615 {
 616         gchar *media_str;
 617
 618         gchar *media_conninfo = NULL;
 619
 620         gchar *codecs_str = NULL;
 621         gchar *codec_ids_str = codec_ids_to_string(media->codecs);
 622
 623         gchar *candidates_str = NULL;
 624         gchar *remote_candidates_str = NULL;
 625
 626         gchar *attributes_str = NULL;
 627         gchar *credentials = NULL;
 628
 629         gboolean uses_tcp_transport = FALSE;
 630
 631         if (media->port != 0) {
 632                 if (!sipe_strequal(msg->ip, media->ip)) {
 633                         media_conninfo = g_strdup_printf("c=IN IP4 %s\r\n", media->ip);
 634                 }
 635
 636                 codecs_str = codecs_to_string(media->codecs);
 637                 candidates_str = candidates_to_string(media->candidates, msg->ice_version);
 638                 remote_candidates_str = remote_candidates_to_string(media->remote_candidates,
 639                                                                     msg->ice_version);
 640
 641                 if (media->remote_candidates) {
 642                         struct sdpcandidate *c = media->remote_candidates->data;
 643                         uses_tcp_transport =
 644                                 c->protocol == SIPE_NETWORK_PROTOCOL_TCP_ACTIVE ||
 645                                 c->protocol == SIPE_NETWORK_PROTOCOL_TCP_PASSIVE ||
 646                                 c->protocol == SIPE_NETWORK_PROTOCOL_TCP_SO;
 647                 }
 648
 649                 attributes_str = attributes_to_string(media->attributes);
 650
 651                 if (msg->ice_version == SIPE_ICE_RFC_5245 && media->candidates) {
 652                         struct sdpcandidate *c = media->candidates->data;
 653
 654                         credentials = g_strdup_printf("a=ice-ufrag:%s\r\n"
 655                                                       "a=ice-pwd:%s\r\n",
 656                                                       c->username,
 657                                                       c->password);
 658                 }
 659         }
 660
 661         media_str = g_strdup_printf("m=%s %d %sRTP/AVP%s\r\n"
 662                                     "%s"
 663                                     "%s"
 664                                     "%s"
 665                                     "%s"
 666                                     "%s"
 667                                     "%s",
 668                                     media->name, media->port, uses_tcp_transport ? "TCP/" : "", codec_ids_str,
 669                                     media_conninfo ? media_conninfo : "",
 670                                     candidates_str ? candidates_str : "",
 671                                     remote_candidates_str ? remote_candidates_str : "",
 672                                     codecs_str ? codecs_str : "",
 673                                     attributes_str ? attributes_str : "",
 674                                     credentials ? credentials : "");
 675
 676         g_free(media_conninfo);
 677         g_free(codecs_str);
 678         g_free(codec_ids_str);
 679         g_free(candidates_str);
 680         g_free(remote_candidates_str);
 681         g_free(attributes_str);
 682         g_free(credentials);
 683
 684         return media_str;
 685 }
 686
 687 gchar *
 688 sdpmsg_to_string(const struct sdpmsg *msg)
 689 {
 690         GString *body = g_string_new(NULL);
 691         GSList *i;
 692
 693         g_string_append_printf(
 694                 body,
 695                 "v=0\r\n"
 696                 "o=- 0 0 IN IP4 %s\r\n"
 697                 "s=session\r\n"
 698                 "c=IN IP4 %s\r\n"
 699                 "b=CT:99980\r\n"
 700                 "t=0 0\r\n",
 701                 msg->ip, msg->ip);
 702
 703
 704         for (i = msg->media; i; i = i->next) {
 705                 gchar *media_str = media_to_string(msg, i->data);
 706                 g_string_append(body, media_str);
 707                 g_free(media_str);
 708         }
 709
 710         return g_string_free(body, FALSE);
 711 }
 712
 713 static struct sdpcandidate *
 714 sdpcandidate_copy(struct sdpcandidate *candidate)
 715 {
 716         if (candidate) {
 717                 struct sdpcandidate *copy = g_new0(struct sdpcandidate, 1);
 718
 719                 copy->foundation = g_strdup(candidate->foundation);
 720                 copy->component  = candidate->component;
 721                 copy->type       = candidate->type;
 722                 copy->protocol   = candidate->protocol;
 723                 copy->priority   = candidate->priority;
 724                 copy->ip         = g_strdup(candidate->ip);
 725                 copy->port       = candidate->port;
 726                 copy->base_ip    = g_strdup(candidate->base_ip);
 727                 copy->base_port  = candidate->base_port;
 728                 copy->username   = g_strdup(candidate->username);
 729                 copy->password   = g_strdup(candidate->password);
 730
 731                 return copy;
 732         } else
 733                 return NULL;
 734 }
 735
 736 static void
 737 sdpcandidate_free(struct sdpcandidate *candidate)
 738 {
 739         if (candidate) {
 740                 g_free(candidate->foundation);
 741                 g_free(candidate->ip);
 742                 g_free(candidate->base_ip);
 743                 g_free(candidate->username);
 744                 g_free(candidate->password);
 745                 g_free(candidate);
 746         }
 747 }
 748
 749 void
 750 sdpcodec_free(struct sdpcodec *codec)
 751 {
 752         if (codec) {
 753                 g_free(codec->name);
 754                 sipe_utils_nameval_free(codec->parameters);
 755                 g_free(codec);
 756         }
 757 }
 758
 759 void
 760 sdpmedia_free(struct sdpmedia *media)
 761 {
 762         if (media) {
 763                 g_free(media->name);
 764                 g_free(media->ip);
 765
 766                 sipe_utils_nameval_free(media->attributes);
 767
 768                 sipe_utils_slist_free_full(media->candidates,
 769                                   (GDestroyNotify) sdpcandidate_free);
 770                 sipe_utils_slist_free_full(media->codecs,
 771                                   (GDestroyNotify) sdpcodec_free);
 772                 sipe_utils_slist_free_full(media->remote_candidates,
 773                                   (GDestroyNotify) sdpcandidate_free);
 774
 775                 g_free(media);
 776         }
 777 }
 778
 779 void
 780 sdpmsg_free(struct sdpmsg *msg)
 781 {
 782         if (msg) {
 783                 g_free(msg->ip);
 784                 sipe_utils_slist_free_full(msg->media,
 785                                   (GDestroyNotify) sdpmedia_free);
 786                 g_free(msg);
 787         }
 788 }
 789
 790 /*
 791   Local Variables:
 792   mode: c
 793   c-file-style: "bsd"
 794   indent-tabs-mode: t
 795   tab-width: 8
 796   End:
 797 */