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         return g_slist_append(candidates, candidate);
 198 }
 199
 200 static GSList *
 201 parse_candidates(GSList *attrs, SipeIceVersion *ice_version)
 202 {
 203         GSList *candidates = NULL;
 204         const gchar *attr;
 205         int i = 0;
 206
 207         while ((attr = sipe_utils_nameval_find_instance(attrs, "candidate", i++))) {
 208                 gchar **tokens = g_strsplit_set(attr, " ", 0);
 209
 210                 if (sipe_strequal(tokens[6], "typ")) {
 211                         candidates = parse_append_candidate_rfc_5245(tokens, candidates);
 212                         if (candidates)
 213                                 *ice_version = SIPE_ICE_RFC_5245;
 214                 } else {
 215                         candidates = parse_append_candidate_draft_6(tokens, candidates);
 216                         if (candidates)
 217                                 *ice_version = SIPE_ICE_DRAFT_6;
 218                 }
 219
 220                 g_strfreev(tokens);
 221         }
 222
 223         if (!candidates)
 224                 *ice_version = SIPE_ICE_NO_ICE;
 225
 226         if (*ice_version == SIPE_ICE_RFC_5245) {
 227                 const gchar *username = sipe_utils_nameval_find(attrs, "ice-ufrag");
 228                 const gchar *password = sipe_utils_nameval_find(attrs, "ice-pwd");
 229
 230                 if (username && password) {
 231                         GSList *i;
 232                         for (i = candidates; i; i = i->next) {
 233                                 struct sdpcandidate *c = i->data;
 234                                 c->username = g_strdup(username);
 235                                 c->password = g_strdup(password);
 236                         }
 237                 }
 238         }
 239
 240         return candidates;
 241 }
 242
 243 static GSList *
 244 create_legacy_candidates(gchar *ip, guint16 port)
 245 {
 246         struct sdpcandidate *candidate;
 247         GSList *candidates = NULL;
 248
 249         candidate = g_new0(struct sdpcandidate, 1);
 250         candidate->foundation = g_strdup("1");
 251         candidate->component = SIPE_COMPONENT_RTP;
 252         candidate->type = SIPE_CANDIDATE_TYPE_HOST;
 253         candidate->protocol = SIPE_NETWORK_PROTOCOL_UDP;
 254         candidate->ip = g_strdup(ip);
 255         candidate->port = port;
 256
 257         candidates = g_slist_append(candidates, candidate);
 258
 259         candidate = g_new0(struct sdpcandidate, 1);
 260         candidate->foundation = g_strdup("1");
 261         candidate->component = SIPE_COMPONENT_RTCP;
 262         candidate->type = SIPE_CANDIDATE_TYPE_HOST;
 263         candidate->protocol = SIPE_NETWORK_PROTOCOL_UDP;
 264         candidate->ip = g_strdup(ip);
 265         candidate->port = port + 1;
 266
 267         candidates = g_slist_append(candidates, candidate);
 268
 269         return candidates;
 270 }
 271
 272 static GSList *
 273 parse_codecs(GSList *attrs, SipeMediaType type)
 274 {
 275         int i = 0;
 276         const gchar *attr;
 277         GSList *codecs = NULL;
 278
 279         while ((attr = sipe_utils_nameval_find_instance(attrs, "rtpmap", i++))) {
 280                 struct sdpcodec *codec = g_new0(struct sdpcodec, 1);
 281                 gchar **tokens = g_strsplit_set(attr, " /", 3);
 282
 283                 int j = 0;
 284                 const gchar* params;
 285
 286                 codec->id = atoi(tokens[0]);
 287                 codec->name = g_strdup(tokens[1]);
 288                 codec->clock_rate = atoi(tokens[2]);
 289                 codec->type = type;
 290
 291                 // TODO: more secure and effective implementation
 292                 while((params = sipe_utils_nameval_find_instance(attrs, "fmtp", j++))) {
 293                         gchar **tokens = g_strsplit_set(params, " ", 0);
 294                         gchar **next = tokens + 1;
 295
 296                         if (atoi(tokens[0]) == codec->id) {
 297                                 while (*next) {
 298                                         gchar name[50];
 299                                         gchar value[50];
 300
 301                                         if (sscanf(*next, "%[a-zA-Z0-9]=%s", name, value) == 2)
 302                                                 codec->parameters = sipe_utils_nameval_add(codec->parameters, name, value);
 303
 304                                         ++next;
 305                                 }
 306                         }
 307
 308                         g_strfreev(tokens);
 309                 }
 310
 311                 codecs = g_slist_append(codecs, codec);
 312                 g_strfreev(tokens);
 313         }
 314
 315         return codecs;
 316 }
 317
 318 struct sdpmsg *
 319 sdpmsg_parse_msg(gchar *msg)
 320 {
 321         struct sdpmsg *smsg = g_new0(struct sdpmsg, 1);
 322         GSList *i;
 323
 324         if (!parse_attributes(smsg, msg)) {
 325                 sdpmsg_free(smsg);
 326                 return NULL;
 327         }
 328
 329         for (i = smsg->media; i; i = i->next) {
 330                 struct sdpmedia *media = i->data;
 331                 SipeMediaType type;
 332
 333                 media->candidates = parse_candidates(media->attributes,
 334                                                      &smsg->ice_version);
 335
 336                 if (!media->candidates && media->port != 0) {
 337                         // No a=candidate in SDP message, this seems to be MSOC 2005
 338                         media->candidates = create_legacy_candidates(smsg->ip, media->port);
 339                 }
 340
 341                 if (sipe_strequal(media->name, "audio"))
 342                         type = SIPE_MEDIA_AUDIO;
 343                 else if (sipe_strequal(media->name, "video"))
 344                         type = SIPE_MEDIA_VIDEO;
 345                 else {
 346                         // Unknown media type
 347                         sdpmsg_free(smsg);
 348                         return NULL;
 349                 }
 350
 351                 media->codecs = parse_codecs(media->attributes, type);
 352         }
 353
 354         return smsg;
 355 }
 356
 357 static gchar *
 358 codecs_to_string(GSList *codecs)
 359 {
 360         GString *result = g_string_new(NULL);
 361
 362         for (; codecs; codecs = codecs->next) {
 363                 struct sdpcodec *c = codecs->data;
 364                 GSList *params = c->parameters;
 365
 366                 g_string_append_printf(result,
 367                                        "a=rtpmap:%d %s/%d\r\n",
 368                                        c->id,
 369                                        c->name,
 370                                        c->clock_rate);
 371
 372                 if (params) {
 373                         g_string_append_printf(result, "a=fmtp:%d", c->id);
 374
 375                         for (; params; params = params->next) {
 376                                 struct sipnameval* par = params->data;
 377                                 g_string_append_printf(result, " %s=%s",
 378                                                        par->name, par->value);
 379                         }
 380
 381                         g_string_append(result, "\r\n");
 382                 }
 383         }
 384
 385         return g_string_free(result, FALSE);
 386 }
 387
 388 static gchar *
 389 codec_ids_to_string(GSList *codecs)
 390 {
 391         GString *result = g_string_new(NULL);
 392
 393         for (; codecs; codecs = codecs->next) {
 394                 struct sdpcodec *c = codecs->data;
 395                 g_string_append_printf(result, " %d", c->id);
 396         }
 397
 398         return g_string_free(result, FALSE);
 399 }
 400
 401 static gchar *
 402 base64_unpad(const gchar *str)
 403 {
 404         gchar *result = g_strdup(str);
 405         gchar *ptr;
 406
 407         for (ptr = result + strlen(result); ptr != result; --ptr) {
 408                 if (*(ptr - 1) != '=') {
 409                         *ptr = '\0';
 410                         break;
 411                 }
 412         }
 413
 414         return result;
 415 }
 416
 417 static gchar *
 418 candidates_to_string(GSList *candidates, SipeIceVersion ice_version)
 419 {
 420         GString *result = g_string_new("");
 421         GSList *i;
 422         GSList *processed_tcp_candidates = NULL;
 423
 424         for (i = candidates; i; i = i->next) {
 425                 struct sdpcandidate *c = i->data;
 426                 const gchar *protocol;
 427                 const gchar *type;
 428                 gchar *related = NULL;
 429
 430                 if (ice_version == SIPE_ICE_RFC_5245) {
 431
 432                         switch (c->protocol) {
 433                                 case SIPE_NETWORK_PROTOCOL_TCP_ACTIVE:
 434                                         protocol = "TCP-ACT";
 435                                         break;
 436                                 case SIPE_NETWORK_PROTOCOL_TCP_PASSIVE:
 437                                         protocol = "TCP-PASS";
 438                                         break;
 439                                 case SIPE_NETWORK_PROTOCOL_UDP:
 440                                         protocol = "UDP";
 441                                         break;
 442                                 default:
 443                                         /* error unknown/unsupported type */
 444                                         protocol = "UNKNOWN";
 445                                         break;
 446                         }
 447
 448                         switch (c->type) {
 449                                 case SIPE_CANDIDATE_TYPE_HOST:
 450                                         type = "host";
 451                                         break;
 452                                 case SIPE_CANDIDATE_TYPE_RELAY:
 453                                         type = "relay";
 454                                         related = g_strdup_printf("raddr %s rport %d ",
 455                                                                   c->ip,
 456                                                                   c->port);
 457                                         break;
 458                                 case SIPE_CANDIDATE_TYPE_SRFLX:
 459                                         type = "srflx";
 460                                         related = g_strdup_printf("raddr %s rport %d",
 461                                                                   c->base_ip,
 462                                                                   c->base_port);
 463                                         break;
 464                                 case SIPE_CANDIDATE_TYPE_PRFLX:
 465                                         type = "prflx";
 466                                         break;
 467                                 default:
 468                                         /* error unknown/unsupported type */
 469                                         type = "unknown";
 470                                         break;
 471                         }
 472
 473                         g_string_append_printf(result,
 474                                                "a=candidate:%s %u %s %u %s %d typ %s %s\r\n",
 475                                                c->foundation,
 476                                                c->component,
 477                                                protocol,
 478                                                c->priority,
 479                                                c->ip,
 480                                                c->port,
 481                                                type,
 482                                                related ? related : "");
 483                         g_free(related);
 484
 485                 } else if (ice_version == SIPE_ICE_DRAFT_6) {
 486                         gchar *username;
 487                         gchar *password;
 488
 489                         switch (c->protocol) {
 490                                 case SIPE_NETWORK_PROTOCOL_TCP_ACTIVE:
 491                                 case SIPE_NETWORK_PROTOCOL_TCP_PASSIVE: {
 492                                         GSList *prev_cand = processed_tcp_candidates;
 493                                         for (; prev_cand; prev_cand = prev_cand->next) {
 494                                                 struct sdpcandidate *c2 = (struct sdpcandidate *)prev_cand->data;
 495
 496                                                 if (sipe_strequal(c->ip, c2->ip) &&
 497                                                     c->component == c2->component) {
 498                                                         break;
 499                                                 }
 500                                         }
 501
 502                                         if (prev_cand) {
 503                                                 protocol = NULL;
 504                                         } else {
 505                                                 protocol = "TCP";
 506                                                 processed_tcp_candidates =
 507                                                         g_slist_append(processed_tcp_candidates, c);
 508                                         }
 509                                         break;
 510                                 }
 511                                 case SIPE_NETWORK_PROTOCOL_UDP:
 512                                         protocol = "UDP";
 513                                         break;
 514                                 default:
 515                                         /* unknown/unsupported type, ignore */
 516                                         protocol = NULL;
 517                                         break;
 518                         }
 519
 520                         if (!protocol) {
 521                                 continue;
 522                         }
 523
 524                         username = base64_unpad(c->username);
 525                         password = base64_unpad(c->password);
 526
 527                         g_string_append_printf(result,
 528                                                "a=candidate:%s %u %s %s 0.%u %s %d\r\n",
 529                                                username,
 530                                                c->component,
 531                                                password,
 532                                                protocol,
 533                                                c->priority,
 534                                                c->ip,
 535                                                c->port);
 536
 537                         g_free(username);
 538                         g_free(password);
 539                 }
 540         }
 541
 542         g_slist_free(processed_tcp_candidates);
 543
 544         return g_string_free(result, FALSE);
 545 }
 546
 547 static gchar *
 548 remote_candidates_to_string(GSList *candidates, SipeIceVersion ice_version)
 549 {
 550         GString *result = g_string_new("");
 551
 552         if (candidates) {
 553                 if (ice_version == SIPE_ICE_RFC_5245) {
 554                         GSList *i;
 555                         g_string_append(result, "a=remote-candidates:");
 556
 557                         for (i = candidates; i; i = i->next) {
 558                                 struct sdpcandidate *c = i->data;
 559                                 g_string_append_printf(result, "%u %s %u ",
 560                                                        c->component, c->ip, c->port);
 561                         }
 562
 563                         g_string_append(result, "\r\n");
 564                 } else if (ice_version == SIPE_ICE_DRAFT_6) {
 565                         struct sdpcandidate *c = candidates->data;
 566                         g_string_append_printf(result, "a=remote-candidate:%s\r\n",
 567                                                c->username);
 568                 }
 569         }
 570
 571         return g_string_free(result, FALSE);
 572 }
 573
 574 static gchar *
 575 attributes_to_string(GSList *attributes)
 576 {
 577         GString *result = g_string_new("");
 578
 579         for (; attributes; attributes = attributes->next) {
 580                 struct sipnameval *a = attributes->data;
 581                 g_string_append_printf(result, "a=%s", a->name);
 582                 if (!sipe_strequal(a->value, ""))
 583                         g_string_append_printf(result, ":%s", a->value);
 584                 g_string_append(result, "\r\n");
 585         }
 586
 587         return g_string_free(result, FALSE);
 588 }
 589
 590 static gchar *
 591 media_to_string(const struct sdpmsg *msg, const struct sdpmedia *media)
 592 {
 593         gchar *media_str;
 594
 595         gchar *media_conninfo = NULL;
 596
 597         gchar *codecs_str = NULL;
 598         gchar *codec_ids_str = codec_ids_to_string(media->codecs);
 599
 600         gchar *candidates_str = NULL;
 601         gchar *remote_candidates_str = NULL;
 602
 603         gchar *tcp_setup_str = NULL;
 604         gchar *attributes_str = NULL;
 605         gchar *credentials = NULL;
 606
 607         gboolean uses_tcp_transport = FALSE;
 608
 609         if (media->port != 0) {
 610                 if (!sipe_strequal(msg->ip, media->ip)) {
 611                         media_conninfo = g_strdup_printf("c=IN IP4 %s\r\n", media->ip);
 612                 }
 613
 614                 codecs_str = codecs_to_string(media->codecs);
 615                 candidates_str = candidates_to_string(media->candidates, msg->ice_version);
 616                 remote_candidates_str = remote_candidates_to_string(media->remote_candidates,
 617                                                                     msg->ice_version);
 618
 619                 if (media->remote_candidates) {
 620                         struct sdpcandidate *c = media->remote_candidates->data;
 621                         uses_tcp_transport =
 622                                 c->protocol == SIPE_NETWORK_PROTOCOL_TCP_ACTIVE ||
 623                                 c->protocol == SIPE_NETWORK_PROTOCOL_TCP_PASSIVE;
 624                         if (uses_tcp_transport) {
 625                                 tcp_setup_str = g_strdup_printf(
 626                                         "a=connection:existing\r\n"
 627                                         "a=setup:%s\r\n",
 628                                         (c->protocol == SIPE_NETWORK_PROTOCOL_TCP_ACTIVE) ? "passive" : "active");
 629                         }
 630                 }
 631
 632                 attributes_str = attributes_to_string(media->attributes);
 633
 634                 if (msg->ice_version == SIPE_ICE_RFC_5245 && media->candidates) {
 635                         struct sdpcandidate *c = media->candidates->data;
 636
 637                         credentials = g_strdup_printf("a=ice-ufrag:%s\r\n"
 638                                                       "a=ice-pwd:%s\r\n",
 639                                                       c->username,
 640                                                       c->password);
 641                 }
 642         }
 643
 644         media_str = g_strdup_printf("m=%s %d %sRTP/AVP%s\r\n"
 645                                     "%s"
 646                                     "%s"
 647                                     "%s"
 648                                     "%s"
 649                                     "%s"
 650                                     "%s"
 651                                     "%s",
 652                                     media->name, media->port, uses_tcp_transport ? "TCP/" : "", codec_ids_str,
 653                                     media_conninfo ? media_conninfo : "",
 654                                     candidates_str ? candidates_str : "",
 655                                     remote_candidates_str ? remote_candidates_str : "",
 656                                     tcp_setup_str ? tcp_setup_str : "",
 657                                     codecs_str ? codecs_str : "",
 658                                     attributes_str ? attributes_str : "",
 659                                     credentials ? credentials : "");
 660
 661         g_free(media_conninfo);
 662         g_free(codecs_str);
 663         g_free(codec_ids_str);
 664         g_free(candidates_str);
 665         g_free(remote_candidates_str);
 666         g_free(tcp_setup_str);
 667         g_free(attributes_str);
 668         g_free(credentials);
 669
 670         return media_str;
 671 }
 672
 673 gchar *
 674 sdpmsg_to_string(const struct sdpmsg *msg)
 675 {
 676         GString *body = g_string_new(NULL);
 677         GSList *i;
 678
 679         g_string_append_printf(
 680                 body,
 681                 "v=0\r\n"
 682                 "o=- 0 0 IN IP4 %s\r\n"
 683                 "s=session\r\n"
 684                 "c=IN IP4 %s\r\n"
 685                 "b=CT:99980\r\n"
 686                 "t=0 0\r\n",
 687                 msg->ip, msg->ip);
 688
 689
 690         for (i = msg->media; i; i = i->next) {
 691                 gchar *media_str = media_to_string(msg, i->data);
 692                 g_string_append(body, media_str);
 693                 g_free(media_str);
 694         }
 695
 696         return g_string_free(body, FALSE);
 697 }
 698
 699 static struct sdpcandidate *
 700 sdpcandidate_copy(struct sdpcandidate *candidate)
 701 {
 702         if (candidate) {
 703                 struct sdpcandidate *copy = g_new0(struct sdpcandidate, 1);
 704
 705                 copy->foundation = g_strdup(candidate->foundation);
 706                 copy->component  = candidate->component;
 707                 copy->type       = candidate->type;
 708                 copy->protocol   = candidate->protocol;
 709                 copy->priority   = candidate->priority;
 710                 copy->ip         = g_strdup(candidate->ip);
 711                 copy->port       = candidate->port;
 712                 copy->base_ip    = g_strdup(candidate->base_ip);
 713                 copy->base_port  = candidate->base_port;
 714                 copy->username   = g_strdup(candidate->username);
 715                 copy->password   = g_strdup(candidate->password);
 716
 717                 return copy;
 718         } else
 719                 return NULL;
 720 }
 721
 722 static void
 723 sdpcandidate_free(struct sdpcandidate *candidate)
 724 {
 725         if (candidate) {
 726                 g_free(candidate->foundation);
 727                 g_free(candidate->ip);
 728                 g_free(candidate->base_ip);
 729                 g_free(candidate->username);
 730                 g_free(candidate->password);
 731                 g_free(candidate);
 732         }
 733 }
 734
 735 static void
 736 sdpcodec_free(struct sdpcodec *codec)
 737 {
 738         if (codec) {
 739                 g_free(codec->name);
 740                 sipe_utils_nameval_free(codec->parameters);
 741                 g_free(codec);
 742         }
 743 }
 744
 745 void
 746 sdpmedia_free(struct sdpmedia *media)
 747 {
 748         if (media) {
 749                 g_free(media->name);
 750                 g_free(media->ip);
 751
 752                 sipe_utils_nameval_free(media->attributes);
 753
 754                 sipe_utils_slist_free_full(media->candidates,
 755                                   (GDestroyNotify) sdpcandidate_free);
 756                 sipe_utils_slist_free_full(media->codecs,
 757                                   (GDestroyNotify) sdpcodec_free);
 758                 sipe_utils_slist_free_full(media->remote_candidates,
 759                                   (GDestroyNotify) sdpcandidate_free);
 760
 761                 g_free(media);
 762         }
 763 }
 764
 765 void
 766 sdpmsg_free(struct sdpmsg *msg)
 767 {
 768         if (msg) {
 769                 g_free(msg->ip);
 770                 sipe_utils_slist_free_full(msg->media,
 771                                   (GDestroyNotify) sdpmedia_free);
 772                 g_free(msg);
 773         }
 774 }
 775
 776 /*
 777   Local Variables:
 778   mode: c
 779   c-file-style: "bsd"
 780   indent-tabs-mode: t
 781   tab-width: 8
 782   End:
 783 */