extl_udp.c

exosip

static int
eXtl_update_local_target(osip_message_t *req)
{
  int pos = 0;

  struct eXosip_account_info *ainfo=NULL;
  char *proxy = NULL;
  int i;
  if (MSG_IS_REQUEST(req))
  {
	  if (req->from!=NULL
		  && req->from->url!=NULL
		  && req->from->url->host!=NULL)
	  proxy = req->from->url->host;
  }
  else
  {
	  if (req->to!=NULL
		  && req->to->url!=NULL
		  && req->to->url->host!=NULL)
	  proxy = req->to->url->host;
  }

  if (proxy!=NULL)
  {
	  for (i=0;i<MAX_EXOSIP_ACCOUNT_INFO;i++)
	  {
		  if (eXosip.account_entries[i].proxy[0]!='\0')
		  {		
			  if (strstr(eXosip.account_entries[i].proxy, proxy)!=NULL
				  || strstr(proxy, eXosip.account_entries[i].proxy)!=NULL)
			  {
				  /* use ainfo */
				  if (eXosip.account_entries[i].nat_ip[0]!='\0')
				  {
					  ainfo = &eXosip.account_entries[i];
					  break;
				  }
			  }
		  }
	  }
  }

  if (udp_firewall_ip!='\0')
  {

	while (!osip_list_eol (&req->contacts, pos))
	{
	  osip_contact_t *co;
	  
	  co = (osip_contact_t *) osip_list_get (&req->contacts, pos);
	  pos++;
	  if (co != NULL && co->url != NULL && co->url->host != NULL
	      && 0 == osip_strcasecmp (co->url->host, udp_firewall_ip))
	    {
			if (ainfo==NULL)
			{
				if (co->url->port == NULL &&
					0 != osip_strcasecmp (udp_firewall_port, "5060"))
				{
					co->url->port = osip_strdup (udp_firewall_port);
				}
				else if (co->url->port != NULL &&
					0 != osip_strcasecmp (udp_firewall_port, co->url->port))
				{
					osip_free (co->url->port);
					co->url->port = osip_strdup (udp_firewall_port);
				}
			}
			else
			{
				if (co->url->port == NULL
					&& ainfo->nat_port!= 5060)
				{
					co->url->port = osip_malloc(10);
				    snprintf(co->url->port, 9, "%i", ainfo->nat_port);
				}
				else if (co->url->port != NULL &&
					ainfo->nat_port != atoi(co->url->port))
				{
					osip_free (co->url->port);
					co->url->port = osip_malloc(10);
				    snprintf(co->url->port, 9, "%i", ainfo->nat_port);
				}
			}
	    }
	}
  }

  return 0;
}

#ifndef INET6_ADDRSTRLEN
#define INET6_ADDRSTRLEN 46
#endif

static int
udp_tl_send_message(osip_transaction_t * tr, osip_message_t * sip, char *host,
                    int port, int out_socket)
{
  int len = 0;
  size_t length = 0;
  struct addrinfo *addrinfo;
  struct __eXosip_sockaddr addr;
  char *message;

  char ipbuf[INET6_ADDRSTRLEN];
  int i;

  if (udp_socket <= 0)
    return -1;

  if (host == NULL)
    {
      host = sip->req_uri->host;
      if (sip->req_uri->port != NULL)
        port = osip_atoi (sip->req_uri->port);
      else
        port = 5060;
    }

  eXtl_update_local_target(sip);

  i=-1;
#ifndef MINISIZE
  if (tr!=NULL && tr->record.name[0]!='\0' && tr->record.srventry[0].srv[0]!='\0')
    {
      /* always choose the first here.
	 if a network error occur, remove first entry and
	 replace with next entries.
      */
      osip_srv_entry_t *srv;
      int n=0;
      for (srv = &tr->record.srventry[0];
	   n<10 && tr->record.srventry[0].srv[0];
	   srv = &tr->record.srventry[0])
	{
	  i = eXosip_get_addrinfo (&addrinfo, srv->srv, srv->port, IPPROTO_UDP);
	  if (i == 0)
	    {
	      host = srv->srv;
	      port = srv->port;
	      break;
	    }
	  memmove(&tr->record.srventry[0], &tr->record.srventry[1], 9*sizeof(osip_srv_entry_t));
	  memset(&tr->record.srventry[9], 0, sizeof(osip_srv_entry_t));
	  i=-1;
	  /* copy next element */
	  n++;
	}
    }
#endif
  
  /* if SRV was used, distination may be already found */
  if (i != 0)
    {
      i = eXosip_get_addrinfo (&addrinfo, host, port, IPPROTO_UDP);
    }
  
  if (i != 0)
    {
      return -1;
    }
  
  memcpy (&addr, addrinfo->ai_addr, addrinfo->ai_addrlen);
  len = addrinfo->ai_addrlen;
  
  eXosip_freeaddrinfo (addrinfo);
  
  /* remove preloaded route if there is no tag in the To header
   */
  {
    osip_route_t *route=NULL;
    osip_generic_param_t *tag=NULL;
    osip_message_get_route (sip, 0, &route);
    
    osip_to_get_tag (sip->to, &tag);
    if (tag==NULL && route != NULL && route->url != NULL)
      {
	osip_list_remove(&sip->routes, 0);
      }
    i = osip_message_to_str (sip, &message, &length);
    if (tag==NULL && route != NULL && route->url != NULL)
      {
	osip_list_add(&sip->routes, route, 0);
      }
  }
  
  if (i != 0 || length <= 0)
    {
      return -1;
    }
  
  switch ( ((struct sockaddr *)&addr)->sa_family )
    {
    case AF_INET:
      inet_ntop (((struct sockaddr *)&addr)->sa_family, &(((struct sockaddr_in *) &addr)->sin_addr),
		 ipbuf, sizeof (ipbuf));
      break;
    case AF_INET6:
      inet_ntop (((struct sockaddr *)&addr)->sa_family,
		 &(((struct sockaddr_in6 *) &addr)->sin6_addr), ipbuf,
		 sizeof (ipbuf));
      break;
    default:
      strncpy (ipbuf, "(unknown)", sizeof (ipbuf));
      break;
    }
  
  OSIP_TRACE (osip_trace (__FILE__, __LINE__, OSIP_INFO1, NULL,
                          "Message sent: (to dest=%s:%i)\n%s\n",
                          ipbuf, port, message));

  if (tr!=NULL)
    {
      if (tr->ict_context != NULL)
	osip_ict_set_destination (tr->ict_context,
				  osip_strdup (ipbuf), port);
      if (tr->nict_context != NULL)
	osip_nict_set_destination (tr->nict_context,
				   osip_strdup (ipbuf), port);
    }

  if (0 >
      sendto (udp_socket, (const void *) message, length, 0,
                      (struct sockaddr *) &addr, len))
    {
#ifdef WIN32
      if (WSAECONNREFUSED == WSAGetLastError ())
#else
      if (ECONNREFUSED == errno)
#endif
	{
	  /* This can be considered as an error, but for the moment,
             I prefer that the application continue to try sending
             message again and again... so we are not in a error case.
             Nevertheless, this error should be announced!
             ALSO, UAS may not have any other options than retry always
             on the same port.
	  */
	  osip_free (message);
          return 1;
	}
      else
	{
	  
#ifndef MINISIZE
	  /* delete first SRV entry that is not reachable */
	  if (tr!=NULL && tr->record.name[0]!='\0' && tr->record.srventry[0].srv[0]!='\0')
	    {
	      memmove(&tr->record.srventry[0], &tr->record.srventry[1], 9*sizeof(osip_srv_entry_t));
	      memset(&tr->record.srventry[9], 0, sizeof(osip_srv_entry_t));
	      osip_free (message);
	      return 0; /* retry for next retransmission! */
	    }
#endif
	  /* SIP_NETWORK_ERROR; */
	  osip_free (message);
          return -1;
	}
    }

  if (eXosip.keep_alive > 0)
    {
      if (MSG_IS_REGISTER (sip))
        {
          eXosip_reg_t *reg = NULL;
	  
          if (_eXosip_reg_find (&reg, tr) == 0)
            {
              memcpy (&(reg->addr), &addr, len);
              reg->len = len;
            }
        }
    }
  
  osip_free (message);
  return 0;
}

static int
udp_tl_keepalive(void)
{
  char buf[4] = "jaK";
  eXosip_reg_t *jr;
  for (jr = eXosip.j_reg; jr != NULL; jr = jr->next)
    {
      if (jr->len > 0)
        {
          if (sendto (udp_socket, (const void *) buf, 4, 0,
                      (struct sockaddr *) &(jr->addr), jr->len) > 0)
            {
              OSIP_TRACE (osip_trace
                          (__FILE__, __LINE__, OSIP_INFO1, NULL,
                           "eXosip: Keep Alive sent on UDP!\n"));
            }
        }
    }
  return 0;
}

static int
udp_tl_set_socket(int socket)
{
  udp_socket = socket;
  
  return 0;
}

static int
udp_tl_masquerade_contact(const char *public_address, int port)
{
  if (public_address == NULL || public_address[0] == '\0')
    {
      memset (udp_firewall_ip, '\0', sizeof (udp_firewall_ip));
      return 0;
    }
  snprintf (udp_firewall_ip, sizeof (udp_firewall_ip), "%s", public_address);
  if (port > 0)
    {
      snprintf (udp_firewall_port, sizeof(udp_firewall_port), "%i", port);
    }
  return 0;
}

static int
udp_tl_get_masquerade_contact(char *ip, int ip_size, char *port, int port_size)
{
  memset(ip, 0, ip_size);
  memset(port, 0, port_size);

  if (udp_firewall_ip!='\0')
    snprintf(ip, ip_size, "%s", udp_firewall_ip);
  
  if (udp_firewall_port!='\0')
    snprintf(port, port_size, "%s", udp_firewall_port);
  return 0;
}

struct eXtl_protocol eXtl_udp = 
  {
    1,
    5060,
    "UDP",
    "0.0.0.0",
    IPPROTO_UDP,
    AF_INET,
    0,
    0,
    
    &udp_tl_init,
    &udp_tl_free,
    &udp_tl_open,
    &udp_tl_set_fdset,
    &udp_tl_read_message,
    &udp_tl_send_message,
    &udp_tl_keepalive,
    &udp_tl_set_socket,
    &udp_tl_masquerade_contact,
    &udp_tl_get_masquerade_contact
};