sjero.net Git - linphone/blob - coreapi/misc.c

   1
   2 /*
   3 linphone
   4 Copyright (C) 2000  Simon MORLAT (simon.morlat@linphone.org)
   5
   6 This program is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public License
   8 as published by the Free Software Foundation; either version 2
   9 of the License, or (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19 */
  20
  21 #include "private.h"
  22 #include "lpconfig.h"
  23 #include "mediastreamer2/mediastream.h"
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #ifdef HAVE_SIGHANDLER_T
  27 #include <signal.h>
  28 #endif /*HAVE_SIGHANDLER_T*/
  29
  30 #include <string.h>
  31 #if !defined(_WIN32_WCE)
  32 #include <errno.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <unistd.h>
  36 #include <fcntl.h>
  37 #endif /*_WIN32_WCE*/
  38
  39 #undef snprintf
  40 #include <ortp/stun.h>
  41
  42 #ifdef HAVE_GETIFADDRS
  43 #include <net/if.h>
  44 #include <ifaddrs.h>
  45 #endif
  46
  47
  48 #if !defined(WIN32)
  49
  50 static char lock_name[80];
  51 static char lock_set=0;
  52 /* put a lock file in /tmp. this is called when linphone runs as a daemon*/
  53 int set_lock_file()
  54 {
  55         FILE *lockfile;
  56
  57         snprintf(lock_name,80,"/tmp/linphone.%i",getuid());
  58         lockfile=fopen(lock_name,"w");
  59         if (lockfile==NULL)
  60         {
  61                 printf("Failed to create lock file.\n");
  62                 return(-1);
  63         }
  64         fprintf(lockfile,"%i",getpid());
  65         fclose(lockfile);
  66         lock_set=1;
  67         return(0);
  68 }
  69
  70 /* looks if there is a lock file. If presents return its content (the pid of the already running linphone), if not found, returns -1*/
  71 int get_lock_file()
  72 {
  73         int pid;
  74         FILE *lockfile;
  75
  76         snprintf(lock_name,80,"/tmp/linphone.%i",getuid());
  77         lockfile=fopen(lock_name,"r");
  78         if (lockfile==NULL)
  79                 return(-1);
  80         if (fscanf(lockfile,"%i",&pid)!=1){
  81                 ms_warning("Could not read pid in lock file.");
  82                 fclose(lockfile);
  83                 return -1;
  84         }
  85         fclose(lockfile);
  86         return pid;
  87 }
  88
  89 /* remove the lock file if it was set*/
  90 int remove_lock_file()
  91 {
  92         int err=0;
  93         if (lock_set)
  94         {
  95                 err=unlink(lock_name);
  96                 lock_set=0;
  97         }
  98         return(err);
  99 }
 100
 101 #endif
 102
 103 char *int2str(int number)
 104 {
 105         char *numstr=ms_malloc(10);
 106         snprintf(numstr,10,"%i",number);
 107         return numstr;
 108 }
 109
 110 void check_sound_device(LinphoneCore *lc)
 111 {
 112 #ifdef _linux
 113         int fd=0;
 114         int len;
 115         int a;
 116         char *file=NULL;
 117         char *i810_audio=NULL;
 118         char *snd_pcm_oss=NULL;
 119         char *snd_mixer_oss=NULL;
 120         char *snd_pcm=NULL;
 121         fd=open("/proc/modules",O_RDONLY);
 122
 123         if (fd>0){
 124                 /* read the entire /proc/modules file and check if sound conf seems correct */
 125                 /*a=fstat(fd,&statbuf);
 126                 if (a<0) ms_warning("Can't stat /proc/modules:%s.",strerror(errno));
 127                 len=statbuf.st_size;
 128                 if (len==0) ms_warning("/proc/modules has zero size!");
 129                 */
 130                 /***** fstat does not work on /proc/modules for unknown reason *****/
 131                 len=6000;
 132                 file=ms_malloc(len+1);
 133                 a=read(fd,file,len);
 134                 if (a<len) file=ms_realloc(file,a+1);
 135                 file[a]='\0';
 136                 i810_audio=strstr(file,"i810_audio");
 137                 if (i810_audio!=NULL){
 138                         /* I'm sorry i put this warning in comments because
 139                          * i don't use yet the right driver !! */
 140 /*                      lc->vtable.display_warning(lc,_("You are currently using the i810_audio driver.\nThis driver is buggy and so does not work with Linphone.\nWe suggest that you replace it by its equivalent ALSA driver,\neither with packages from your distribution, or by downloading\nALSA drivers at http://www.alsa-project.org."));*/
 141                         goto end;
 142                 }
 143                 snd_pcm=strstr(file,"snd-pcm");
 144                 if (snd_pcm!=NULL){
 145                         snd_pcm_oss=strstr(file,"snd-pcm-oss");
 146                         snd_mixer_oss=strstr(file,"snd-mixer-oss");
 147                         if (snd_pcm_oss==NULL){
 148                                 lc->vtable.display_warning(lc,_("Your computer appears to be using ALSA sound drivers.\nThis is the best choice. However the pcm oss emulation module\nis missing and linphone needs it. Please execute\n'modprobe snd-pcm-oss' as root to load it."));
 149                         }
 150                         if (snd_mixer_oss==NULL){
 151                                 lc->vtable.display_warning(lc,_("Your computer appears to be using ALSA sound drivers.\nThis is the best choice. However the mixer oss emulation module\nis missing and linphone needs it. Please execute\n 'modprobe snd-mixer-oss' as root to load it."));
 152                         }
 153                 }
 154         }else {
 155
 156                 ms_warning("Could not open /proc/modules.");
 157         }
 158         /* now check general volume. Some user forget to rise it and then complain that linphone is
 159         not working */
 160         /* but some other users complain that linphone should not change levels...
 161         if (lc->sound_conf.sndcard!=NULL){
 162                 a=snd_card_get_level(lc->sound_conf.sndcard,SND_CARD_LEVEL_GENERAL);
 163                 if (a<50){
 164                         ms_warning("General level is quite low (%i). Linphone rises it up for you.",a);
 165                         snd_card_set_level(lc->sound_conf.sndcard,SND_CARD_LEVEL_GENERAL,80);
 166                 }
 167         }
 168         */
 169         end:
 170         if (file!=NULL) ms_free(file);
 171         if (fd>0) close(fd);
 172 #endif
 173 }
 174
 175 #define UDP_HDR_SZ 8
 176 #define RTP_HDR_SZ 12
 177 #define IP4_HDR_SZ 20   /*20 is the minimum, but there may be some options*/
 178
 179 static void payload_type_set_enable(PayloadType *pt,int value)
 180 {
 181         if ((value)!=0) payload_type_set_flag(pt,PAYLOAD_TYPE_ENABLED); \
 182         else payload_type_unset_flag(pt,PAYLOAD_TYPE_ENABLED);
 183 }
 184
 185 static bool_t payload_type_enabled(const PayloadType *pt) {
 186         return (((pt)->flags & PAYLOAD_TYPE_ENABLED)!=0);
 187 }
 188
 189 bool_t linphone_core_payload_type_enabled(LinphoneCore *lc, const PayloadType *pt){
 190         if (ms_list_find(lc->codecs_conf.audio_codecs, (PayloadType*) pt) || ms_list_find(lc->codecs_conf.video_codecs, (PayloadType*)pt)){
 191                 return payload_type_enabled(pt);
 192         }
 193         ms_error("Getting enablement status of codec not in audio or video list of PayloadType !");
 194         return FALSE;
 195 }
 196
 197 int linphone_core_enable_payload_type(LinphoneCore *lc, PayloadType *pt, bool_t enabled){
 198         if (ms_list_find(lc->codecs_conf.audio_codecs,pt) || ms_list_find(lc->codecs_conf.video_codecs,pt)){
 199                 payload_type_set_enable(pt,enabled);
 200                 _linphone_core_codec_config_write(lc);
 201                 return 0;
 202         }
 203         ms_error("Enabling codec not in audio or video list of PayloadType !");
 204         return -1;
 205 }
 206
 207 int linphone_core_get_payload_type_number(LinphoneCore *lc, const PayloadType *pt){
 208        return payload_type_get_number(pt);
 209 }
 210
 211 const char *linphone_core_get_payload_type_description(LinphoneCore *lc, PayloadType *pt){
 212         if (ms_filter_codec_supported(pt->mime_type)){
 213                 MSFilterDesc *desc=ms_filter_get_encoder(pt->mime_type);
 214 #ifdef ENABLE_NLS
 215                 return dgettext("mediastreamer",desc->text);
 216 #else
 217                 return desc->text;
 218 #endif
 219         }
 220         return NULL;
 221 }
 222
 223
 224 /*this function makes a special case for speex/8000.
 225 This codec is variable bitrate. The 8kbit/s mode is interesting when having a low upload bandwidth, but its quality
 226 is not very good. We 'd better use its 15kbt/s mode when we have enough bandwidth*/
 227 static int get_codec_bitrate(LinphoneCore *lc, const PayloadType *pt){
 228         int upload_bw=linphone_core_get_upload_bandwidth(lc);
 229         if (bandwidth_is_greater(upload_bw,129) || (bandwidth_is_greater(upload_bw,33) && !linphone_core_video_enabled(lc)) ) {
 230                 if (strcmp(pt->mime_type,"speex")==0 && pt->clock_rate==8000){
 231                         return 15000;
 232                 }
 233         }
 234         return pt->normal_bitrate;
 235 }
 236
 237 static double get_audio_payload_bandwidth(LinphoneCore *lc, const PayloadType *pt){
 238         double npacket=50;
 239         double packet_size;
 240         int bitrate;
 241         bitrate=get_codec_bitrate(lc,pt);
 242         packet_size= (((double)bitrate)/(50*8))+UDP_HDR_SZ+RTP_HDR_SZ+IP4_HDR_SZ;
 243         return packet_size*8.0*npacket;
 244 }
 245
 246 void linphone_core_update_allocated_audio_bandwidth_in_call(LinphoneCall *call, const PayloadType *pt){
 247         call->audio_bw=(int)(get_audio_payload_bandwidth(call->core,pt)/1000.0);
 248         ms_message("Audio bandwidth for this call is %i",call->audio_bw);
 249 }
 250
 251 void linphone_core_update_allocated_audio_bandwidth(LinphoneCore *lc){
 252         const MSList *elem;
 253         PayloadType *max=NULL;
 254         for(elem=linphone_core_get_audio_codecs(lc);elem!=NULL;elem=elem->next){
 255                 PayloadType *pt=(PayloadType*)elem->data;
 256                 if (payload_type_enabled(pt)){
 257                         int pt_bitrate=get_codec_bitrate(lc,pt);
 258                         if (max==NULL) max=pt;
 259                         else if (max->normal_bitrate<pt_bitrate){
 260                                 max=pt;
 261                         }
 262                 }
 263         }
 264         if (max) {
 265                 lc->audio_bw=(int)(get_audio_payload_bandwidth(lc,max)/1000.0);
 266         }
 267 }
 268
 269 bool_t linphone_core_is_payload_type_usable_for_bandwidth(LinphoneCore *lc, PayloadType *pt,  int bandwidth_limit)
 270 {
 271         double codec_band;
 272         bool_t ret=FALSE;
 273
 274         switch (pt->type){
 275                 case PAYLOAD_AUDIO_CONTINUOUS:
 276                 case PAYLOAD_AUDIO_PACKETIZED:
 277                         codec_band=get_audio_payload_bandwidth(lc,pt);
 278                         ret=bandwidth_is_greater(bandwidth_limit*1000,codec_band);
 279                         /*hack to avoid using uwb codecs when having low bitrate and video*/
 280                         if (bandwidth_is_greater(199,bandwidth_limit)){
 281                                 if (linphone_core_video_enabled(lc) && pt->clock_rate>16000){
 282                                         ret=FALSE;
 283                                 }
 284                         }
 285                         //ms_message("Payload %s: %g",pt->mime_type,codec_band);
 286                         break;
 287                 case PAYLOAD_VIDEO:
 288                         if (bandwidth_limit!=0) {/* infinite (-1) or strictly positive*/
 289                                 ret=TRUE;
 290                         }
 291                         else ret=FALSE;
 292                         break;
 293         }
 294         return ret;
 295 }
 296
 297 /* return TRUE if codec can be used with bandwidth, FALSE else*/
 298 bool_t linphone_core_check_payload_type_usability(LinphoneCore *lc, PayloadType *pt)
 299 {
 300         double codec_band;
 301         int allowed_bw,video_bw;
 302         bool_t ret=FALSE;
 303
 304         linphone_core_update_allocated_audio_bandwidth(lc);
 305         allowed_bw=get_min_bandwidth(linphone_core_get_download_bandwidth(lc),
 306                                         linphone_core_get_upload_bandwidth(lc));
 307         if (allowed_bw==0) {
 308                 allowed_bw=-1;
 309                 video_bw=1500; /*around 1.5 Mbit/s*/
 310         }else
 311                 video_bw=get_video_bandwidth(allowed_bw,lc->audio_bw);
 312
 313         switch (pt->type){
 314                 case PAYLOAD_AUDIO_CONTINUOUS:
 315                 case PAYLOAD_AUDIO_PACKETIZED:
 316                         codec_band=get_audio_payload_bandwidth(lc,pt);
 317                         ret=bandwidth_is_greater(allowed_bw*1000,codec_band);
 318                         /*hack to avoid using uwb codecs when having low bitrate and video*/
 319                         if (bandwidth_is_greater(199,allowed_bw)){
 320                                 if (linphone_core_video_enabled(lc) && pt->clock_rate>16000){
 321                                         ret=FALSE;
 322                                 }
 323                         }
 324                         //ms_message("Payload %s: %g",pt->mime_type,codec_band);
 325                         break;
 326                 case PAYLOAD_VIDEO:
 327                         if (video_bw>0){
 328                                 pt->normal_bitrate=video_bw*1000;
 329                                 ret=TRUE;
 330                         }
 331                         else ret=FALSE;
 332                         break;
 333         }
 334         return ret;
 335 }
 336
 337 bool_t lp_spawn_command_line_sync(const char *command, char **result,int *command_ret){
 338 #if !defined(_WIN32_WCE)
 339         FILE *f=popen(command,"r");
 340         if (f!=NULL){
 341                 int err;
 342                 *result=ms_malloc(4096);
 343                 err=fread(*result,1,4096-1,f);
 344                 if (err<0){
 345                         ms_warning("Error reading command output:%s",strerror(errno));
 346                         ms_free(result);
 347                         return FALSE;
 348                 }
 349                 (*result)[err]=0;
 350                 err=pclose(f);
 351                 if (command_ret!=NULL) *command_ret=err;
 352                 return TRUE;
 353         }
 354 #endif /*_WIN32_WCE*/
 355         return FALSE;
 356 }
 357
 358 static ortp_socket_t create_socket(int local_port){
 359         struct sockaddr_in laddr;
 360         ortp_socket_t sock;
 361         int optval;
 362         sock=socket(PF_INET,SOCK_DGRAM,IPPROTO_UDP);
 363         if (sock<0) {
 364                 ms_error("Fail to create socket");
 365                 return -1;
 366         }
 367         memset (&laddr,0,sizeof(laddr));
 368         laddr.sin_family=AF_INET;
 369         laddr.sin_addr.s_addr=INADDR_ANY;
 370         laddr.sin_port=htons(local_port);
 371         if (bind(sock,(struct sockaddr*)&laddr,sizeof(laddr))<0){
 372                 ms_error("Bind socket to 0.0.0.0:%i failed: %s",local_port,getSocketError());
 373                 close_socket(sock);
 374                 return -1;
 375         }
 376         optval=1;
 377         if (setsockopt (sock, SOL_SOCKET, SO_REUSEADDR,
 378                                 (SOCKET_OPTION_VALUE)&optval, sizeof (optval))<0){
 379                 ms_warning("Fail to set SO_REUSEADDR");
 380         }
 381         set_non_blocking_socket(sock);
 382         return sock;
 383 }
 384
 385 static int sendStunRequest(int sock, const struct sockaddr *server, socklen_t addrlen, int id, bool_t changeAddr){
 386         char buf[STUN_MAX_MESSAGE_SIZE];
 387         int len = STUN_MAX_MESSAGE_SIZE;
 388         StunAtrString username;
 389         StunAtrString password;
 390         StunMessage req;
 391         int err;
 392         memset(&req, 0, sizeof(StunMessage));
 393         memset(&username,0,sizeof(username));
 394         memset(&password,0,sizeof(password));
 395         stunBuildReqSimple( &req, &username, changeAddr , changeAddr , id);
 396         len = stunEncodeMessage( &req, buf, len, &password);
 397         if (len<=0){
 398                 ms_error("Fail to encode stun message.");
 399                 return -1;
 400         }
 401         err=sendto(sock,buf,len,0,server,addrlen);
 402         if (err<0){
 403                 ms_error("sendto failed: %s",strerror(errno));
 404                 return -1;
 405         }
 406         return 0;
 407 }
 408
 409 int parse_hostname_to_addr(const char *server, struct sockaddr_storage *ss, socklen_t *socklen){
 410         struct addrinfo hints,*res=NULL;
 411         int family = PF_INET;
 412         int port_int = 3478;
 413         int ret;
 414         char port[6];
 415         char host[NI_MAXHOST];
 416         char *p1, *p2;
 417         if ((sscanf(server, "[%64[^]]]:%d", host, &port_int) == 2) || (sscanf(server, "[%64[^]]]", host) == 1)) {
 418                 family = PF_INET6;
 419         } else {
 420                 p1 = strchr(server, ':');
 421                 p2 = strrchr(server, ':');
 422                 if (p1 && p2 && (p1 != p2)) {
 423                         family = PF_INET6;
 424                         host[NI_MAXHOST-1]='\0';
 425                         strncpy(host, server, sizeof(host) - 1);
 426                 } else if (sscanf(server, "%[^:]:%d", host, &port_int) != 2) {
 427                         host[NI_MAXHOST-1]='\0';
 428                         strncpy(host, server, sizeof(host) - 1);
 429                 }
 430         }
 431         snprintf(port, sizeof(port), "%d", port_int);
 432         memset(&hints,0,sizeof(hints));
 433         hints.ai_family=family;
 434         hints.ai_socktype=SOCK_DGRAM;
 435         hints.ai_protocol=IPPROTO_UDP;
 436         ret=getaddrinfo(host,port,&hints,&res);
 437         if (ret!=0){
 438                 ms_error("getaddrinfo() failed for %s:%s : %s",host,port,gai_strerror(ret));
 439                 return -1;
 440         }
 441         if (!res) return -1;
 442         memcpy(ss,res->ai_addr,res->ai_addrlen);
 443         *socklen=res->ai_addrlen;
 444         freeaddrinfo(res);
 445         return 0;
 446 }
 447
 448 static int recvStunResponse(ortp_socket_t sock, char *ipaddr, int *port, int *id){
 449         char buf[STUN_MAX_MESSAGE_SIZE];
 450         int len = STUN_MAX_MESSAGE_SIZE;
 451         StunMessage resp;
 452         len=recv(sock,buf,len,0);
 453         if (len>0){
 454                 struct in_addr ia;
 455                 stunParseMessage(buf,len, &resp );
 456                 *id=resp.msgHdr.tr_id.octet[0];
 457                 if (resp.hasXorMappedAddress){
 458                         *port = resp.xorMappedAddress.ipv4.port;
 459                         ia.s_addr=htonl(resp.xorMappedAddress.ipv4.addr);
 460                 }else if (resp.hasMappedAddress){
 461                         *port = resp.mappedAddress.ipv4.port;
 462                         ia.s_addr=htonl(resp.mappedAddress.ipv4.addr);
 463                 }else return -1;
 464                 strncpy(ipaddr,inet_ntoa(ia),LINPHONE_IPADDR_SIZE);
 465         }
 466         return len;
 467 }
 468
 469 /* this functions runs a simple stun test and return the number of milliseconds to complete the tests, or -1 if the test were failed.*/
 470 int linphone_core_run_stun_tests(LinphoneCore *lc, LinphoneCall *call){
 471         const char *server=linphone_core_get_stun_server(lc);
 472         StunCandidate *ac=&call->ac;
 473         StunCandidate *vc=&call->vc;
 474
 475         if (lc->sip_conf.ipv6_enabled){
 476                 ms_warning("stun support is not implemented for ipv6");
 477                 return -1;
 478         }
 479         if (server!=NULL){
 480                 struct sockaddr_storage ss;
 481                 socklen_t ss_len;
 482                 ortp_socket_t sock1=-1, sock2=-1;
 483                 int loops=0;
 484                 bool_t video_enabled=linphone_core_video_enabled(lc);
 485                 bool_t got_audio,got_video;
 486                 bool_t cone_audio=FALSE,cone_video=FALSE;
 487                 struct timeval init,cur;
 488                 double elapsed;
 489                 int ret=0;
 490
 491                 if (parse_hostname_to_addr(server,&ss,&ss_len)<0){
 492                         ms_error("Fail to parser stun server address: %s",server);
 493                         return -1;
 494                 }
 495                 if (lc->vtable.display_status!=NULL)
 496                         lc->vtable.display_status(lc,_("Stun lookup in progress..."));
 497
 498                 /*create the two audio and video RTP sockets, and send STUN message to our stun server */
 499                 sock1=create_socket(call->audio_port);
 500                 if (sock1==-1) return -1;
 501                 if (video_enabled){
 502                         sock2=create_socket(call->video_port);
 503                         if (sock2==-1) return -1;
 504                 }
 505                 got_audio=FALSE;
 506                 got_video=FALSE;
 507                 gettimeofday(&init,NULL);
 508                 do{
 509
 510                         int id;
 511                         if (loops%20==0){
 512                                 ms_message("Sending stun requests...");
 513                                 sendStunRequest(sock1,(struct sockaddr*)&ss,ss_len,11,TRUE);
 514                                 sendStunRequest(sock1,(struct sockaddr*)&ss,ss_len,1,FALSE);
 515                                 if (sock2!=-1){
 516                                         sendStunRequest(sock2,(struct sockaddr*)&ss,ss_len,22,TRUE);
 517                                         sendStunRequest(sock2,(struct sockaddr*)&ss,ss_len,2,FALSE);
 518                                 }
 519                         }
 520 #ifdef WIN32
 521                         Sleep(10);
 522 #else
 523                         usleep(10000);
 524 #endif
 525
 526                         if (recvStunResponse(sock1,ac->addr,
 527                                                 &ac->port,&id)>0){
 528                                 ms_message("STUN test result: local audio port maps to %s:%i",
 529                                                 ac->addr,
 530                                                 ac->port);
 531                                 if (id==11)
 532                                         cone_audio=TRUE;
 533                                 got_audio=TRUE;
 534                         }
 535                         if (recvStunResponse(sock2,vc->addr,
 536                                                         &vc->port,&id)>0){
 537                                 ms_message("STUN test result: local video port maps to %s:%i",
 538                                         vc->addr,
 539                                         vc->port);
 540                                 if (id==22)
 541                                         cone_video=TRUE;
 542                                 got_video=TRUE;
 543                         }
 544                         gettimeofday(&cur,NULL);
 545                         elapsed=((cur.tv_sec-init.tv_sec)*1000.0) +  ((cur.tv_usec-init.tv_usec)/1000.0);
 546                         if (elapsed>2000)  {
 547                                 ms_message("Stun responses timeout, going ahead.");
 548                                 ret=-1;
 549                                 break;
 550                         }
 551                         loops++;
 552                 }while(!(got_audio && (got_video||sock2==-1)  ) );
 553                 if (ret==0) ret=(int)elapsed;
 554                 if (!got_audio){
 555                         ms_error("No stun server response for audio port.");
 556                 }else{
 557                         if (!cone_audio) {
 558                                 ms_message("NAT is symmetric for audio port");
 559                         }
 560                 }
 561                 if (sock2!=-1){
 562                         if (!got_video){
 563                                 ms_error("No stun server response for video port.");
 564                         }else{
 565                                 if (!cone_video) {
 566                                         ms_message("NAT is symmetric for video port.");
 567                                 }
 568                         }
 569                 }
 570                 close_socket(sock1);
 571                 if (sock2!=-1) close_socket(sock2);
 572                 return ret;
 573         }
 574         return -1;
 575 }
 576
 577 void linphone_core_adapt_to_network(LinphoneCore *lc, int ping_time_ms, LinphoneCallParams *params){
 578         if (lp_config_get_int(lc->config,"net","activate_edge_workarounds",0)==1){
 579                 ms_message("Stun server ping time is %i ms",ping_time_ms);
 580                 int threshold=lp_config_get_int(lc->config,"net","edge_ping_time",500);
 581
 582                 if (ping_time_ms>threshold){
 583                         int edge_ptime=lp_config_get_int(lc->config,"net","edge_ptime",100);
 584                         int edge_bw=lp_config_get_int(lc->config,"net","edge_bw",20);
 585                         /* we are in a 2G network*/
 586                         params->up_bw=params->down_bw=edge_bw;
 587                         params->up_ptime=params->down_ptime=edge_ptime;
 588                         params->has_video=FALSE;
 589
 590                 }/*else use default settings */
 591         }
 592 }
 593
 594
 595
 596 int linphone_core_gather_ice_candidates(LinphoneCore *lc, LinphoneCall *call)
 597 {
 598         char local_addr[64];
 599         struct sockaddr_storage ss;
 600         socklen_t ss_len;
 601         IceCheckList *audio_check_list;
 602         IceCheckList *video_check_list;
 603         const char *server = linphone_core_get_stun_server(lc);
 604
 605         if ((server == NULL) || (call->ice_session == NULL)) return -1;
 606         audio_check_list = ice_session_check_list(call->ice_session, 0);
 607         video_check_list = ice_session_check_list(call->ice_session, 1);
 608         if (audio_check_list == NULL) return -1;
 609
 610         if (lc->sip_conf.ipv6_enabled){
 611                 ms_warning("stun support is not implemented for ipv6");
 612                 return -1;
 613         }
 614
 615         if (parse_hostname_to_addr(server, &ss, &ss_len) < 0) {
 616                 ms_error("Fail to parser stun server address: %s", server);
 617                 return -1;
 618         }
 619         if (lc->vtable.display_status != NULL)
 620                 lc->vtable.display_status(lc, _("ICE local candidates gathering in progress..."));
 621
 622         /* Gather local host candidates. */
 623         if (linphone_core_get_local_ip_for(AF_INET, NULL, local_addr) < 0) {
 624                 ms_error("Fail to get local ip");
 625                 return -1;
 626         }
 627         ice_add_local_candidate(audio_check_list, "host", local_addr, call->audio_port, 1, NULL);
 628         ice_add_local_candidate(audio_check_list, "host", local_addr, call->audio_port + 1, 2, NULL);
 629         call->stats[LINPHONE_CALL_STATS_AUDIO].ice_state = LinphoneIceStateInProgress;
 630         if (call->params.has_video && (video_check_list != NULL)) {
 631                 ice_add_local_candidate(video_check_list, "host", local_addr, call->video_port, 1, NULL);
 632                 ice_add_local_candidate(video_check_list, "host", local_addr, call->video_port + 1, 2, NULL);
 633                 call->stats[LINPHONE_CALL_STATS_VIDEO].ice_state = LinphoneIceStateInProgress;
 634         }
 635
 636         ms_message("ICE: gathering candidate from [%s]",server);
 637         /* Gather local srflx candidates. */
 638         ice_session_gather_candidates(call->ice_session, ss, ss_len);
 639         return 0;
 640 }
 641
 642 void linphone_core_update_ice_state_in_call_stats(LinphoneCall *call)
 643 {
 644         IceCheckList *audio_check_list;
 645         IceCheckList *video_check_list;
 646         IceSessionState session_state;
 647
 648         if (call->ice_session == NULL) return;
 649         audio_check_list = ice_session_check_list(call->ice_session, 0);
 650         video_check_list = ice_session_check_list(call->ice_session, 1);
 651         if (audio_check_list == NULL) return;
 652
 653         session_state = ice_session_state(call->ice_session);
 654         if ((session_state == IS_Completed) || ((session_state == IS_Failed) && (ice_session_has_completed_check_list(call->ice_session) == TRUE))) {
 655                 switch (ice_check_list_selected_valid_candidate_type(audio_check_list)) {
 656                         case ICT_HostCandidate:
 657                                 call->stats[LINPHONE_CALL_STATS_AUDIO].ice_state = LinphoneIceStateHostConnection;
 658                                 break;
 659                         case ICT_ServerReflexiveCandidate:
 660                         case ICT_PeerReflexiveCandidate:
 661                                 call->stats[LINPHONE_CALL_STATS_AUDIO].ice_state = LinphoneIceStateReflexiveConnection;
 662                                 break;
 663                         case ICT_RelayedCandidate:
 664                                 call->stats[LINPHONE_CALL_STATS_AUDIO].ice_state = LinphoneIceStateRelayConnection;
 665                                 break;
 666                 }
 667                 if (call->params.has_video && (video_check_list != NULL)) {
 668                         switch (ice_check_list_selected_valid_candidate_type(video_check_list)) {
 669                                 case ICT_HostCandidate:
 670                                         call->stats[LINPHONE_CALL_STATS_VIDEO].ice_state = LinphoneIceStateHostConnection;
 671                                         break;
 672                                 case ICT_ServerReflexiveCandidate:
 673                                 case ICT_PeerReflexiveCandidate:
 674                                         call->stats[LINPHONE_CALL_STATS_VIDEO].ice_state = LinphoneIceStateReflexiveConnection;
 675                                         break;
 676                                 case ICT_RelayedCandidate:
 677                                         call->stats[LINPHONE_CALL_STATS_VIDEO].ice_state = LinphoneIceStateRelayConnection;
 678                                         break;
 679                         }
 680                 }
 681         } else {
 682                 call->stats[LINPHONE_CALL_STATS_AUDIO].ice_state = LinphoneIceStateFailed;
 683                 if (call->params.has_video && (video_check_list != NULL)) {
 684                         call->stats[LINPHONE_CALL_STATS_VIDEO].ice_state = LinphoneIceStateFailed;
 685                 }
 686         }
 687 }
 688
 689 void linphone_core_update_local_media_description_from_ice(SalMediaDescription *desc, IceSession *session)
 690 {
 691         const char *rtp_addr, *rtcp_addr;
 692         IceSessionState session_state = ice_session_state(session);
 693         int nb_candidates;
 694         int i, j;
 695         bool_t result;
 696
 697         if (session_state == IS_Completed) {
 698                 desc->ice_completed = TRUE;
 699                 result = ice_check_list_selected_valid_local_candidate(ice_session_check_list(session, 0), &rtp_addr, NULL, NULL, NULL);
 700                 if (result == TRUE) {
 701                         strncpy(desc->addr, rtp_addr, sizeof(desc->addr));
 702                 } else {
 703                         ms_warning("If ICE has completed successfully, rtp_addr should be set!");
 704                 }
 705         }
 706         else {
 707                 desc->ice_completed = FALSE;
 708         }
 709         strncpy(desc->ice_pwd, ice_session_local_pwd(session), sizeof(desc->ice_pwd));
 710         strncpy(desc->ice_ufrag, ice_session_local_ufrag(session), sizeof(desc->ice_ufrag));
 711         for (i = 0; i < desc->nstreams; i++) {
 712                 SalStreamDescription *stream = &desc->streams[i];
 713                 IceCheckList *cl = ice_session_check_list(session, i);
 714                 nb_candidates = 0;
 715                 if (cl == NULL) continue;
 716                 if (ice_check_list_state(cl) == ICL_Completed) {
 717                         stream->ice_completed = TRUE;
 718                         result = ice_check_list_selected_valid_local_candidate(ice_session_check_list(session, i), &rtp_addr, &stream->rtp_port, &rtcp_addr, &stream->rtcp_port);
 719                 } else {
 720                         stream->ice_completed = FALSE;
 721                         result = ice_check_list_default_local_candidate(ice_session_check_list(session, i), &rtp_addr, &stream->rtp_port, &rtcp_addr, &stream->rtcp_port);
 722                 }
 723                 if (result == TRUE) {
 724                         strncpy(stream->rtp_addr, rtp_addr, sizeof(stream->rtp_addr));
 725                         strncpy(stream->rtcp_addr, rtcp_addr, sizeof(stream->rtcp_addr));
 726                 } else {
 727                         memset(stream->rtp_addr, 0, sizeof(stream->rtp_addr));
 728                         memset(stream->rtcp_addr, 0, sizeof(stream->rtcp_addr));
 729                 }
 730                 if ((strlen(ice_check_list_local_pwd(cl)) != strlen(desc->ice_pwd)) || (strcmp(ice_check_list_local_pwd(cl), desc->ice_pwd)))
 731                         strncpy(stream->ice_pwd, ice_check_list_local_pwd(cl), sizeof(stream->ice_pwd));
 732                 else
 733                         memset(stream->ice_pwd, 0, sizeof(stream->ice_pwd));
 734                 if ((strlen(ice_check_list_local_ufrag(cl)) != strlen(desc->ice_ufrag)) || (strcmp(ice_check_list_local_ufrag(cl), desc->ice_ufrag)))
 735                         strncpy(stream->ice_ufrag, ice_check_list_local_ufrag(cl), sizeof(stream->ice_ufrag));
 736                 else
 737                         memset(stream->ice_pwd, 0, sizeof(stream->ice_pwd));
 738                 stream->ice_mismatch = ice_check_list_is_mismatch(cl);
 739                 if ((ice_check_list_state(cl) == ICL_Running) || (ice_check_list_state(cl) == ICL_Completed)) {
 740                         memset(stream->ice_candidates, 0, sizeof(stream->ice_candidates));
 741                         for (j = 0; j < MIN(ms_list_size(cl->local_candidates), SAL_MEDIA_DESCRIPTION_MAX_ICE_CANDIDATES); j++) {
 742                                 SalIceCandidate *sal_candidate = &stream->ice_candidates[nb_candidates];
 743                                 IceCandidate *ice_candidate = ms_list_nth_data(cl->local_candidates, j);
 744                                 const char *default_addr = NULL;
 745                                 int default_port = 0;
 746                                 if (ice_candidate->componentID == 1) {
 747                                         default_addr = stream->rtp_addr;
 748                                         default_port = stream->rtp_port;
 749                                 } else if (ice_candidate->componentID == 2) {
 750                                         default_addr = stream->rtcp_addr;
 751                                         default_port = stream->rtcp_port;
 752                                 } else continue;
 753                                 if (default_addr[0] == '\0') default_addr = desc->addr;
 754                                 /* Only include the candidates matching the default destination for each component of the stream if the state is Completed as specified in RFC5245 section 9.1.2.2. */
 755                                 if ((ice_check_list_state(cl) == ICL_Completed)
 756                                         && !((ice_candidate->taddr.port == default_port) && (strlen(ice_candidate->taddr.ip) == strlen(default_addr)) && (strcmp(ice_candidate->taddr.ip, default_addr) == 0)))
 757                                         continue;
 758                                 strncpy(sal_candidate->foundation, ice_candidate->foundation, sizeof(sal_candidate->foundation));
 759                                 sal_candidate->componentID = ice_candidate->componentID;
 760                                 sal_candidate->priority = ice_candidate->priority;
 761                                 strncpy(sal_candidate->type, ice_candidate_type(ice_candidate), sizeof(sal_candidate->type));
 762                                 strncpy(sal_candidate->addr, ice_candidate->taddr.ip, sizeof(sal_candidate->addr));
 763                                 sal_candidate->port = ice_candidate->taddr.port;
 764                                 if ((ice_candidate->base != NULL) && (ice_candidate->base != ice_candidate)) {
 765                                         strncpy(sal_candidate->raddr, ice_candidate->base->taddr.ip, sizeof(sal_candidate->raddr));
 766                                         sal_candidate->rport = ice_candidate->base->taddr.port;
 767                                 }
 768                                 nb_candidates++;
 769                         }
 770                 }
 771                 if ((ice_check_list_state(cl) == ICL_Completed) && (ice_session_role(session) == IR_Controlling)) {
 772                         int rtp_port, rtcp_port;
 773                         memset(stream->ice_remote_candidates, 0, sizeof(stream->ice_remote_candidates));
 774                         ice_check_list_selected_valid_remote_candidate(cl, &rtp_addr, &rtp_port, &rtcp_addr, &rtcp_port);
 775                         strncpy(stream->ice_remote_candidates[0].addr, rtp_addr, sizeof(stream->ice_remote_candidates[0].addr));
 776                         stream->ice_remote_candidates[0].port = rtp_port;
 777                         strncpy(stream->ice_remote_candidates[1].addr, rtcp_addr, sizeof(stream->ice_remote_candidates[1].addr));
 778                         stream->ice_remote_candidates[1].port = rtcp_port;
 779                 }
 780         }
 781 }
 782
 783 static void get_default_addr_and_port(uint16_t componentID, const SalMediaDescription *md, const SalStreamDescription *stream, const char **addr, int *port)
 784 {
 785         if (componentID == 1) {
 786                 *addr = stream->rtp_addr;
 787                 *port = stream->rtp_port;
 788         } else if (componentID == 2) {
 789                 *addr = stream->rtcp_addr;
 790                 *port = stream->rtcp_port;
 791         } else return;
 792         if ((*addr)[0] == '\0') *addr = md->addr;
 793 }
 794
 795 void linphone_core_update_ice_from_remote_media_description(LinphoneCall *call, const SalMediaDescription *md)
 796 {
 797         bool_t ice_restarted = FALSE;
 798
 799         if ((md->ice_pwd[0] != '\0') && (md->ice_ufrag[0] != '\0')) {
 800                 int i, j;
 801
 802                 /* Check for ICE restart and set remote credentials. */
 803                 if ((strcmp(md->addr, "0.0.0.0") == 0) || (strcmp(md->addr, "::0") == 0)) {
 804                         ice_session_restart(call->ice_session);
 805                         ice_restarted = TRUE;
 806                 } else {
 807                         for (i = 0; i < md->nstreams; i++) {
 808                                 const SalStreamDescription *stream = &md->streams[i];
 809                                 IceCheckList *cl = ice_session_check_list(call->ice_session, i);
 810                                 if (cl && (strcmp(stream->rtp_addr, "0.0.0.0") == 0)) {
 811                                         ice_session_restart(call->ice_session);
 812                                         ice_restarted = TRUE;
 813                                         break;
 814                                 }
 815                         }
 816                 }
 817                 if ((ice_session_remote_ufrag(call->ice_session) == NULL) && (ice_session_remote_pwd(call->ice_session) == NULL)) {
 818                         ice_session_set_remote_credentials(call->ice_session, md->ice_ufrag, md->ice_pwd);
 819                 } else if (ice_session_remote_credentials_changed(call->ice_session, md->ice_ufrag, md->ice_pwd)) {
 820                         if (ice_restarted == FALSE) {
 821                                 ice_session_restart(call->ice_session);
 822                                 ice_restarted = TRUE;
 823                         }
 824                         ice_session_set_remote_credentials(call->ice_session, md->ice_ufrag, md->ice_pwd);
 825                 }
 826                 for (i = 0; i < md->nstreams; i++) {
 827                         const SalStreamDescription *stream = &md->streams[i];
 828                         IceCheckList *cl = ice_session_check_list(call->ice_session, i);
 829                         if (cl && (stream->ice_pwd[0] != '\0') && (stream->ice_ufrag[0] != '\0')) {
 830                                 if (ice_check_list_remote_credentials_changed(cl, stream->ice_ufrag, stream->ice_pwd)) {
 831                                         if (ice_restarted == FALSE) {
 832                                                 ice_session_restart(call->ice_session);
 833                                                 ice_restarted = TRUE;
 834                                         }
 835                                         ice_session_set_remote_credentials(call->ice_session, md->ice_ufrag, md->ice_pwd);
 836                                         break;
 837                                 }
 838                         }
 839                 }
 840
 841                 /* Create ICE check lists if needed and parse ICE attributes. */
 842                 for (i = 0; i < md->nstreams; i++) {
 843                         const SalStreamDescription *stream = &md->streams[i];
 844                         IceCheckList *cl = ice_session_check_list(call->ice_session, i);
 845                         if (cl == NULL) {
 846                                 cl = ice_check_list_new();
 847                                 ice_session_add_check_list(call->ice_session, cl);
 848                                 switch (stream->type) {
 849                                         case SalAudio:
 850                                                 if (call->audiostream != NULL) call->audiostream->ice_check_list = cl;
 851                                                 break;
 852                                         case SalVideo:
 853                                                 if (call->videostream != NULL) call->videostream->ice_check_list = cl;
 854                                                 break;
 855                                         default:
 856                                                 break;
 857                                 }
 858                         }
 859                         if ((stream->ice_mismatch == TRUE) || (stream->rtp_port == 0)) {
 860                                 ice_check_list_set_state(cl, ICL_Failed);
 861                         } else {
 862                                 if ((stream->ice_pwd[0] != '\0') && (stream->ice_ufrag[0] != '\0'))
 863                                         ice_check_list_set_remote_credentials(cl, stream->ice_ufrag, stream->ice_pwd);
 864                                 for (j = 0; j < SAL_MEDIA_DESCRIPTION_MAX_ICE_CANDIDATES; j++) {
 865                                         const SalIceCandidate *candidate = &stream->ice_candidates[j];
 866                                         bool_t default_candidate = FALSE;
 867                                         const char *addr = NULL;
 868                                         int port = 0;
 869                                         if (candidate->addr[0] == '\0') break;
 870                                         if ((candidate->componentID == 0) || (candidate->componentID > 2)) continue;
 871                                         get_default_addr_and_port(candidate->componentID, md, stream, &addr, &port);
 872                                         if (addr && (candidate->port == port) && (strlen(candidate->addr) == strlen(addr)) && (strcmp(candidate->addr, addr) == 0))
 873                                                 default_candidate = TRUE;
 874                                         ice_add_remote_candidate(cl, candidate->type, candidate->addr, candidate->port, candidate->componentID,
 875                                                 candidate->priority, candidate->foundation, default_candidate);
 876                                 }
 877                                 if (ice_restarted == FALSE) {
 878                                         bool_t losing_pairs_added = FALSE;
 879                                         for (j = 0; j < SAL_MEDIA_DESCRIPTION_MAX_ICE_REMOTE_CANDIDATES; j++) {
 880                                                 const SalIceRemoteCandidate *candidate = &stream->ice_remote_candidates[j];
 881                                                 const char *addr = NULL;
 882                                                 int port = 0;
 883                                                 int componentID = j + 1;
 884                                                 if (candidate->addr[0] == '\0') break;
 885                                                 get_default_addr_and_port(componentID, md, stream, &addr, &port);
 886                                                 ice_add_losing_pair(cl, j + 1, candidate->addr, candidate->port, addr, port);
 887                                                 losing_pairs_added = TRUE;
 888                                         }
 889                                         if (losing_pairs_added == TRUE) ice_check_list_check_completed(cl);
 890                                 }
 891                         }
 892                 }
 893                 for (i = ice_session_nb_check_lists(call->ice_session); i > md->nstreams; i--) {
 894                         ice_session_remove_check_list(call->ice_session, ice_session_check_list(call->ice_session, i - 1));
 895                 }
 896                 ice_session_check_mismatch(call->ice_session);
 897         } else {
 898                 /* Response from remote does not contain mandatory ICE attributes, delete the session. */
 899                 linphone_call_delete_ice_session(call);
 900                 return;
 901         }
 902         if (ice_session_nb_check_lists(call->ice_session) == 0) {
 903                 linphone_call_delete_ice_session(call);
 904         }
 905 }
 906
 907 void linphone_core_deactivate_ice_for_deactivated_media_streams(LinphoneCall *call, const SalMediaDescription *md)
 908 {
 909         int i;
 910         for (i = 0; i < md->nstreams; i++) {
 911                 IceCheckList *cl = ice_session_check_list(call->ice_session, i);
 912                 if (cl && (md->streams[i].rtp_port == 0)) {
 913                         if (ice_check_list_state(cl) != ICL_Completed) ice_check_list_set_state(cl, ICL_Failed);
 914                 }
 915         }
 916 }
 917
 918 LinphoneCall * is_a_linphone_call(void *user_pointer){
 919         LinphoneCall *call=(LinphoneCall*)user_pointer;
 920         if (call==NULL) return NULL;
 921         return call->magic==linphone_call_magic ? call : NULL;
 922 }
 923
 924 LinphoneProxyConfig * is_a_linphone_proxy_config(void *user_pointer){
 925         LinphoneProxyConfig *cfg=(LinphoneProxyConfig*)user_pointer;
 926         if (cfg==NULL) return NULL;
 927         return cfg->magic==linphone_proxy_config_magic ? cfg : NULL;
 928 }
 929
 930 unsigned int linphone_core_get_audio_features(LinphoneCore *lc){
 931         unsigned int ret=0;
 932         const char *features=lp_config_get_string(lc->config,"sound","features",NULL);
 933         if (features){
 934                 char tmp[256]={0};
 935                 char name[256];
 936                 char *p,*n;
 937                 strncpy(tmp,features,sizeof(tmp)-1);
 938                 for(p=tmp;*p!='\0';p++){
 939                         if (*p==' ') continue;
 940                         n=strchr(p,'|');
 941                         if (n) *n='\0';
 942                         sscanf(p,"%s",name);
 943                         ms_message("Found audio feature %s",name);
 944                         if (strcasecmp(name,"PLC")==0) ret|=AUDIO_STREAM_FEATURE_PLC;
 945                         else if (strcasecmp(name,"EC")==0) ret|=AUDIO_STREAM_FEATURE_EC;
 946                         else if (strcasecmp(name,"EQUALIZER")==0) ret|=AUDIO_STREAM_FEATURE_EQUALIZER;
 947                         else if (strcasecmp(name,"VOL_SND")==0) ret|=AUDIO_STREAM_FEATURE_VOL_SND;
 948                         else if (strcasecmp(name,"VOL_RCV")==0) ret|=AUDIO_STREAM_FEATURE_VOL_RCV;
 949                         else if (strcasecmp(name,"DTMF")==0) ret|=AUDIO_STREAM_FEATURE_DTMF;
 950                         else if (strcasecmp(name,"DTMF_ECHO")==0) ret|=AUDIO_STREAM_FEATURE_DTMF_ECHO;
 951                         else if (strcasecmp(name,"ALL")==0) ret|=AUDIO_STREAM_FEATURE_ALL;
 952                         else if (strcasecmp(name,"NONE")==0) ret=0;
 953                         else ms_error("Unsupported audio feature %s requested in config file.",name);
 954                         if (!n) break;
 955                         p=n;
 956                 }
 957         }else ret=AUDIO_STREAM_FEATURE_ALL;
 958         return ret;
 959 }
 960
 961
 962 #ifdef HAVE_GETIFADDRS
 963
 964 #include <ifaddrs.h>
 965 static int get_local_ip_with_getifaddrs(int type, char *address, int size)
 966 {
 967         struct ifaddrs *ifp;
 968         struct ifaddrs *ifpstart;
 969         int ret = 0;
 970
 971         if (getifaddrs(&ifpstart) < 0) {
 972                 return -1;
 973         }
 974 #ifndef __linux
 975         #define UP_FLAG IFF_UP /* interface is up */
 976 #else
 977         #define UP_FLAG IFF_RUNNING /* resources allocated */
 978 #endif
 979
 980         for (ifp = ifpstart; ifp != NULL; ifp = ifp->ifa_next) {
 981                 if (ifp->ifa_addr && ifp->ifa_addr->sa_family == type
 982                         && (ifp->ifa_flags & UP_FLAG) && !(ifp->ifa_flags & IFF_LOOPBACK))
 983                 {
 984                         getnameinfo(ifp->ifa_addr,
 985                                                 (type == AF_INET6) ?
 986                                                 sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in),
 987                                                 address, size, NULL, 0, NI_NUMERICHOST);
 988                         if (strchr(address, '%') == NULL) {     /*avoid ipv6 link-local addresses */
 989                                 /*ms_message("getifaddrs() found %s",address);*/
 990                                 ret++;
 991                                 break;
 992                         }
 993                 }
 994         }
 995         freeifaddrs(ifpstart);
 996         return ret;
 997 }
 998 #endif
 999
1000
1001 static int get_local_ip_for_with_connect(int type, const char *dest, char *result){
1002         int err,tmp;
1003         struct addrinfo hints;
1004         struct addrinfo *res=NULL;
1005         struct sockaddr_storage addr;
1006         struct sockaddr *p_addr=(struct sockaddr*)&addr;
1007         ortp_socket_t sock;
1008         socklen_t s;
1009
1010         memset(&hints,0,sizeof(hints));
1011         hints.ai_family=(type==AF_INET6) ? PF_INET6 : PF_INET;
1012         hints.ai_socktype=SOCK_DGRAM;
1013         /*hints.ai_flags=AI_NUMERICHOST|AI_CANONNAME;*/
1014         err=getaddrinfo(dest,"5060",&hints,&res);
1015         if (err!=0){
1016                 ms_error("getaddrinfo() error: %s",gai_strerror(err));
1017                 return -1;
1018         }
1019         if (res==NULL){
1020                 ms_error("bug: getaddrinfo returned nothing.");
1021                 return -1;
1022         }
1023         sock=socket(res->ai_family,SOCK_DGRAM,0);
1024         tmp=1;
1025         err=setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(SOCKET_OPTION_VALUE)&tmp,sizeof(int));
1026         if (err<0){
1027                 ms_warning("Error in setsockopt: %s",strerror(errno));
1028         }
1029         err=connect(sock,res->ai_addr,res->ai_addrlen);
1030         if (err<0) {
1031                 ms_error("Error in connect: %s",strerror(errno));
1032                 freeaddrinfo(res);
1033                 close_socket(sock);
1034                 return -1;
1035         }
1036         freeaddrinfo(res);
1037         res=NULL;
1038         s=sizeof(addr);
1039         err=getsockname(sock,(struct sockaddr*)&addr,&s);
1040         if (err!=0) {
1041                 ms_error("Error in getsockname: %s",strerror(errno));
1042                 close_socket(sock);
1043                 return -1;
1044         }
1045         if (p_addr->sa_family==AF_INET){
1046                 struct sockaddr_in *p_sin=(struct sockaddr_in*)p_addr;
1047                 if (p_sin->sin_addr.s_addr==0){
1048                         close_socket(sock);
1049                         return -1;
1050                 }
1051         }
1052         err=getnameinfo((struct sockaddr *)&addr,s,result,LINPHONE_IPADDR_SIZE,NULL,0,NI_NUMERICHOST);
1053         if (err!=0){
1054                 ms_error("getnameinfo error: %s",strerror(errno));
1055         }
1056         close_socket(sock);
1057         ms_message("Local interface to reach %s is %s.",dest,result);
1058         return 0;
1059 }
1060
1061 int linphone_core_get_local_ip_for(int type, const char *dest, char *result){
1062         strcpy(result,type==AF_INET ? "127.0.0.1" : "::1");
1063 #ifdef HAVE_GETIFADDRS
1064         if (dest==NULL) {
1065                 /*we use getifaddrs for lookup of default interface */
1066                 int found_ifs;
1067
1068                 found_ifs=get_local_ip_with_getifaddrs(type,result,LINPHONE_IPADDR_SIZE);
1069                 if (found_ifs==1){
1070                         return 0;
1071                 }else if (found_ifs<=0){
1072                         /*absolutely no network on this machine */
1073                         return -1;
1074                 }
1075         }
1076 #endif
1077         /*else use connect to find the best local ip address */
1078         if (type==AF_INET)
1079                 dest="87.98.157.38"; /*a public IP address*/
1080         else dest="2a00:1450:8002::68";
1081         return get_local_ip_for_with_connect(type,dest,result);
1082 }
1083
1084 #ifndef WIN32
1085 #include <resolv.h>
1086
1087
1088
1089 void _linphone_core_configure_resolver(){
1090 /*bionic declares _res but does not define nor export it !!*/
1091 #ifdef ANDROID
1092         /*timeout and attempts are the same as retrans and retry, but are android specific names.*/
1093         setenv("RES_OPTIONS","timeout:2 attempts:2 retrans:2 retry:2",1);
1094 #else
1095         res_init();
1096         _res.retrans=2; /*retransmit every two seconds*/
1097         _res.retry=2; /*only two times per DNS server*/
1098 #endif
1099 }
1100
1101 #else
1102
1103 void _linphone_core_configure_resolver(){
1104 }
1105
1106 #endif