ice.c

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/*
mediastreamer2 library - modular sound and video processing and streaming
Copyright (C) 2006  Simon MORLAT ([e-mail])

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#if !defined(WIN32) && !defined(_WIN32_WCE)
#ifdef __APPLE__
#include <sys/types.h>
#endif
#include <sys/socket.h>
#include <netdb.h>
#endif

#include "mediastreamer2/ice.h"
#include "mediastreamer2/mscommon.h"

static void 
ice_sendtest( Socket myFd, StunAddress4 *dest, 
              const StunAtrString *username, const StunAtrString *password, 
              int testNum, bool_t verbose , UInt128 *tid);

static void 
ice_sendtest( Socket myFd, StunAddress4 *dest, 
              const StunAtrString *username, const StunAtrString *password, 
              int testNum, bool_t verbose , UInt128 *tid)
{	
   bool_t changePort=FALSE;
   bool_t changeIP=FALSE;
   bool_t discard=FALSE;

   StunMessage req;
   char buf[STUN_MAX_MESSAGE_SIZE];
   int len = STUN_MAX_MESSAGE_SIZE;
   
   switch (testNum)
   {
      case 1:
      case 10:
      case 11:
         break;
      case 2:
         /* changePort=TRUE; */
         changeIP=TRUE;
         break;
      case 3:
         changePort=TRUE;
         break;
      case 4:
         changeIP=TRUE;
         break;
      case 5:
         discard=TRUE;
         break;
      default:
         printf("Test %i is unkown\n", testNum);
         return ; /* error */
   }
   
   memset(&req, 0, sizeof(StunMessage));
	
   stunBuildReqSimple( &req, username, 
                       changePort , changeIP , 
                       testNum );
	
   len = stunEncodeMessage( &req, buf, len, password,verbose );

   memcpy(tid , &(req.msgHdr.id), sizeof(req.msgHdr.id));

   sendMessage( myFd, buf, len, dest->addr, dest->port, verbose );	
}

int ice_sound_send_stun_request(RtpSession *session, struct CandidatePair *remote_candidates, int round)
{
	int roll=250;
#if 0
    /* in "passive" mode (UA not behind a NATor behind a full cone NAT),
    wait a few delay before sending the first STUN request:
    this help to traverse */
    if (session->setup_passive>0)
    {
        return 0;
    }
#endif

	if (remote_candidates==NULL)
		return 0;

	if (round>500)
		roll=2*roll;

    if (round%roll==50)
    {
        int pos;

#if 0
        /* do this only with application that support this */
        if (osip_strncasecmp(remote_useragent, "linphone/", 8)!=0)
        {
            /* use stun only with linphone to linphone softphone */
            return 0;
        }
#endif

        for (pos=0;pos<10 && remote_candidates[pos].remote_candidate.ipaddr[0]!='\0';pos++)
        {
            int media_socket = rtp_session_get_rtp_socket(session);
            StunAddress4 stunServerAddr;
            StunAtrString username;
            StunAtrString password;
            bool_t res;
            int  pad_size;

            struct CandidatePair *cand_pair = &remote_candidates[pos]; 
            username.sizeValue = 0;
            password.sizeValue = 0;

            /* set username to L3:1:R2:1 */
            snprintf(username.value, sizeof(username.value), "%s:%i:%s:%i",
                cand_pair->local_candidate.candidate_id,
                1,
                cand_pair->remote_candidate.candidate_id,
                1);
            username.sizeValue = (UInt16)strlen(username.value);
            pad_size = username.sizeValue % 4;

            username.value[username.sizeValue]='\0';
            username.value[username.sizeValue+1]='\0';
            username.value[username.sizeValue+2]='\0';
            username.value[username.sizeValue+3]='\0';

            username.sizeValue = username.sizeValue + 4 - pad_size;

            snprintf(password.value, sizeof(password.value), "%s",
                cand_pair->remote_candidate.password);
            password.sizeValue = (UInt16)strlen(password.value);

#if 0
            pad_size = password.sizeValue%4;
            password.value[password.sizeValue]='\0';
            password.value[password.sizeValue+1]='\0';
            password.value[password.sizeValue+2]='\0';
            password.value[password.sizeValue+3]='\0';
            password.sizeValue = password.sizeValue + pad_size;
#endif

            res = stunParseServerName(cand_pair->remote_candidate.ipaddr,
                &stunServerAddr);
            if ( res == TRUE )
            {
                stunServerAddr.port = cand_pair->remote_candidate.port;
                ice_sendtest(media_socket, &stunServerAddr, &username, &password, 1, 0/*FALSE*/,
                    &(cand_pair->tid));
            }
        }
    }

    return 0;
}

static int
_ice_get_localip_for (struct sockaddr_storage *saddr, size_t saddr_len, char *loc, int size)
{
  int err, tmp;
  int sock;
  struct sockaddr_storage addr;
  socklen_t addr_len;

  strcpy (loc, "127.0.0.1");    /* always fallback to local loopback */

  sock = socket (saddr->ss_family, SOCK_DGRAM, 0);
  tmp = 1;
  err = setsockopt (sock, SOL_SOCKET, SO_REUSEADDR, (const char *) &tmp, sizeof (int));
  if (err < 0)
    {
        ms_error("ice.c: Error in setsockopt");
        closesocket (sock);
        return -1;
    }
  err = connect (sock, (struct sockaddr*)saddr, saddr_len);
  if (err < 0)
    {
        ms_error("ice.c: Error in connect");
        closesocket (sock);
        return -1;
    }
  addr_len = sizeof (addr);
  err = getsockname (sock, (struct sockaddr *) &addr, (socklen_t*)&addr_len);
  if (err != 0)
    {
        ms_error("ice.c: Error in getsockname");
        closesocket (sock);
        return -1;
    }

  err = getnameinfo ((struct sockaddr *) &addr, addr_len, loc, size, NULL, 0, NI_NUMERICHOST);
  if (err != 0)
    {
        ms_error("ice.c: Error in getnameinfo");
        closesocket (sock);
        return -1;
    }
  closesocket (sock);
  /* ms_message("ice.c: Outgoing interface for sending STUN answer is %s", loc); */
  return 0;
}

int ice_process_stun_message(RtpSession *session, struct CandidatePair *remote_candidates, OrtpEvent *evt)
{
    int switch_to_address = -1;
    StunMessage msg;
    bool_t res;
    int already_worked_once=-1;
    OrtpEventData *evt_data = ortp_event_get_data(evt);
    mblk_t *mp = evt_data->packet;
    struct sockaddr_in *udp_remote;
    char src6host[NI_MAXHOST];
    int recvport = 0;
    int i;

    udp_remote = (struct sockaddr_in*)&evt_data->ep->addr;

    memset( &msg, 0 , sizeof(msg) );
    res = stunParseMessage((char*)mp->b_rptr, mp->b_wptr-mp->b_rptr, &msg, 0);
    if (!res)
    {
        ms_error("ice.c: Malformed STUN packet.");
        return -1;
    }

    memset (src6host, 0, sizeof (src6host));

    {
      struct sockaddr_storage *aaddr = (struct sockaddr_storage *)&evt_data->ep->addr;
      if (aaddr->ss_family==AF_INET)
        recvport = ntohs (((struct sockaddr_in *) udp_remote)->sin_port);
      else
        recvport = ntohs (((struct sockaddr_in6 *) &evt_data->ep->addr)->sin6_port);
    }
    i = getnameinfo ((struct sockaddr*)&evt_data->ep->addr, evt_data->ep->addrlen,
                    src6host, NI_MAXHOST,
                    NULL, 0, NI_NUMERICHOST);
    if (i != 0)
    {
        ms_error("ice.c: Error with getnameinfo");
    } else
    {
	    if (msg.msgHdr.msgType == BindRequestMsg)
		    ms_message("ice.c: Request received from: %s:%i",
			            src6host, recvport);
		else
		    ms_message("ice.c: Answer received from: %s:%i",
			            src6host, recvport);
    }

    if (remote_candidates!=NULL) {
        int pos;
        for (pos=0;pos<10 && remote_candidates[pos].remote_candidate.ipaddr[0]!='\0';pos++)
        {
            struct CandidatePair *cand_pair = &remote_candidates[pos];
#ifdef RESTRICTIVE_ICE
            if (cand_pair->connectivity_check == VALID
                ||cand_pair->connectivity_check == RECV_VALID)
            {
                already_worked_once=pos;
                break;