osip.c

嵌入式产品中的osip的源代码.

/*
  The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-)
  Copyright (C) 2001,2002,2003  Aymeric MOIZARD [e-mail]
  
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
  
  This library 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
  Lesser General Public License for more details.
  
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <osip2/internal.h>
#include <osip2/osip.h>

#include "fsm.h"
#include "xixt.h"

#ifdef OSIP_MT
static struct osip_mutex *ict_fastmutex;
static struct osip_mutex *ist_fastmutex;
static struct osip_mutex *nict_fastmutex;
static struct osip_mutex *nist_fastmutex;
#endif

#ifdef OSIP_RETRANSMIT_2XX

#include <osip2/osip_dialog.h>
#ifdef OSIP_MT
static struct osip_mutex *ixt_fastmutex;
#endif

#endif

static int __osip_global_init (void);
static void __osip_global_free (void);
static int increase_ref_count (void);
static void decrease_ref_count (void);

static int
__osip_global_init ()
{
  /* load the fsm configuration */
  __ict_load_fsm ();
  __ist_load_fsm ();
  __nict_load_fsm ();
  __nist_load_fsm ();

  /* load the parser configuration */
  parser_init ();

#ifdef OSIP_MT
  ict_fastmutex = osip_mutex_init ();
  ist_fastmutex = osip_mutex_init ();
  nict_fastmutex = osip_mutex_init ();
  nist_fastmutex = osip_mutex_init ();

#ifdef OSIP_RETRANSMIT_2XX
  ixt_fastmutex = osip_mutex_init ();
#endif

#endif
  return 0;
}

static void
__osip_global_free ()
{
  __ict_unload_fsm ();
  __ist_unload_fsm ();
  __nict_unload_fsm ();
  __nist_unload_fsm ();

#ifdef OSIP_MT
  osip_mutex_destroy (ict_fastmutex);
  osip_mutex_destroy (ist_fastmutex);
  osip_mutex_destroy (nict_fastmutex);
  osip_mutex_destroy (nist_fastmutex);

#ifdef OSIP_RETRANSMIT_2XX
  osip_mutex_destroy (ixt_fastmutex);
#endif
#endif
}

#ifdef OSIP_RETRANSMIT_2XX

int
osip_ixt_lock (osip_t * osip)
{
#ifdef OSIP_MT
  return osip_mutex_lock (ixt_fastmutex);
#else
  return 0;
#endif
}

int
osip_ixt_unlock (osip_t * osip)
{
#ifdef OSIP_MT
  return osip_mutex_unlock (ixt_fastmutex);
#else
  return 0;
#endif
}

/* these are for transactions that would need retransmission not handled by state machines */
void
osip_add_ixt (osip_t * osip, ixt_t * ixt)
{
  /* ajout dans la liste de osip_t->ixt */
  osip_ixt_lock (osip);
  osip_list_add (osip->ixt_retransmissions, (void *) ixt, 0);
  osip_ixt_unlock (osip);
}

void
osip_remove_ixt (osip_t * osip, ixt_t * ixt)
{
  int i;
  int found = 0;
  ixt_t *tmp;
  /* ajout dans la liste de osip_t->ixt */
  osip_ixt_lock (osip);
  for (i = 0; !osip_list_eol (osip->ixt_retransmissions, i); i++)
    {
      tmp = (ixt_t *) osip_list_get (osip->ixt_retransmissions, i);
      if (tmp == ixt)
	{
	  osip_list_remove (osip->ixt_retransmissions, i);
	  found = 1;
	  break;
	}
    }
  osip_ixt_unlock (osip);
}


void
response_get_destination (osip_message_t * response, char **address,
			  int *portnum)
{
  osip_via_t *via;
  char *host = NULL;
  int port = 0;

  via = (osip_via_t *) osip_list_get (response->vias, 0);
  if (via)
    {
      osip_generic_param_t *maddr;
      osip_generic_param_t *received;
      osip_generic_param_t *rport;
      osip_via_param_get_byname (via, "maddr", &maddr);
      osip_via_param_get_byname (via, "received", &received);
      osip_via_param_get_byname (via, "rport", &rport);
      /* 1: user should not use the provided information
         (host and port) if they are using a reliable
         transport. Instead, they should use the already
         open socket attached to this transaction. */
      /* 2: check maddr and multicast usage */
      if (maddr != NULL)
	host = maddr->gvalue;
      /* we should check if this is a multicast address and use
         set the "ttl" in this case. (this must be done in the
         UDP message (not at the SIP layer) */
      else if (received != NULL)
	host = received->gvalue;
      else
	host = via->host;

      if (rport == NULL || rport->gvalue == NULL)
	{
	  if (via->port != NULL)
	    port = osip_atoi (via->port);
	  else
	    port = 5060;
	}
      else
	port = osip_atoi (rport->gvalue);
    }
  *portnum = port;
  if (host != NULL)
    *address = osip_strdup (host);
  else
    *address = NULL;
}


int
ixt_init (ixt_t ** ixt)
{
  ixt_t *pixt;
  *ixt = pixt = (ixt_t *) osip_malloc (sizeof (ixt_t));
  if (pixt==NULL) return -1;
  pixt->dialog = NULL;
  pixt->msg2xx = NULL;
  pixt->ack = NULL;
  pixt->start = time (NULL);
  pixt->interval = 500;
  pixt->counter = 7;
  pixt->dest = NULL;
  pixt->port = 5060;
  pixt->sock = -1;
  return 0;
}

void
ixt_free (ixt_t * ixt)
{
  osip_message_free (ixt->ack);
  osip_message_free (ixt->msg2xx);
  osip_free (ixt->dest);
  osip_free (ixt);
}

/* usefull for UAs */
void
osip_start_200ok_retransmissions (osip_t * osip, osip_dialog_t * dialog,
				  osip_message_t * msg200ok, int sock)
{
  ixt_t *ixt;
  ixt_init (&ixt);
  ixt->dialog = dialog;
  osip_message_clone (msg200ok, &ixt->msg2xx);
  ixt->sock = sock;
  response_get_destination (msg200ok, &ixt->dest, &ixt->port);
  osip_add_ixt (osip, ixt);
}

void
osip_start_ack_retransmissions (osip_t * osip, osip_dialog_t * dialog,
				osip_message_t * ack, char *dest, int port,
				int sock)
{
  int i;
  ixt_t *ixt;
  i = ixt_init (&ixt);
  if (i != 0)
    return;
  ixt->dialog = dialog;
  osip_message_clone (ack, &ixt->ack);
  ixt->dest = osip_strdup (dest);
  ixt->port = port;
  ixt->sock = sock;
  osip_add_ixt (osip, ixt);
}

/* we stop the 200ok when receiving the corresponding ack */
void
osip_stop_200ok_retransmissions (osip_t * osip, osip_message_t * ack)
{
  int i;
  ixt_t *ixt;
  osip_ixt_lock (osip);
  for (i = 0; !osip_list_eol (osip->ixt_retransmissions, i); i++)
    {
      ixt = (ixt_t *) osip_list_get (osip->ixt_retransmissions, i);
      if (osip_dialog_match_as_uas (ixt->dialog, ack) == 0)
	{
	  osip_list_remove (osip->ixt_retransmissions, i);
	  ixt_free (ixt);
	  break;
	}
    }
  osip_ixt_unlock (osip);
}

/* when a dialog is destroyed by the application,
   it is safer to remove all ixt that are related to it */
void
osip_stop_retransmissions_from_dialog (osip_t * osip, osip_dialog_t * dialog)
{
  int i;
  ixt_t *ixt;
  osip_ixt_lock (osip);
  for (i = 0; !osip_list_eol (osip->ixt_retransmissions, i); i++)
    {
      ixt = (ixt_t *) osip_list_get (osip->ixt_retransmissions, i);
      if (ixt->dialog == dialog)
	{
	  osip_list_remove (osip->ixt_retransmissions, i);
	  ixt_free (ixt);
	  i--;
	}
    }
  osip_ixt_unlock (osip);
}

void
ixt_retransmit (osip_t * osip, ixt_t * ixt, time_t current)
{
  if ((current - ixt->start) * 1000 > ixt->interval)
    {
      ixt->interval = ixt->interval * 2;
      ixt->start = current;
      if (ixt->ack != NULL)
	osip->cb_send_message (NULL, ixt->ack,
			       ixt->dest, ixt->port, ixt->sock);
      else if (ixt->msg2xx != NULL)
	osip->cb_send_message (NULL, ixt->msg2xx,
			       ixt->dest, ixt->port, ixt->sock);
      ixt->counter--;
    }
}

void
osip_retransmissions_execute (osip_t * osip)
{
  int i;
  time_t current;
  ixt_t *ixt;
  current = time (NULL);
  osip_ixt_lock (osip);
  for (i = 0; !osip_list_eol (osip->ixt_retransmissions, i); i++)
    {
      ixt = (ixt_t *) osip_list_get (osip->ixt_retransmissions, i);
      ixt_retransmit (osip, ixt, current);
      if (ixt->counter == 0)
	{
	  /* remove it */
	  osip_list_remove (osip->ixt_retransmissions, i);
	  ixt_free (ixt);
	  i--;
	}
    }
  osip_ixt_unlock (osip);
}

#endif

int
osip_ict_lock (osip_t * osip)
{
#ifdef OSIP_MT
  return osip_mutex_lock (ict_fastmutex);
#else
  return 0;
#endif
}

int
osip_ict_unlock (osip_t * osip)
{
#ifdef OSIP_MT
  return osip_mutex_unlock (ict_fastmutex);
#else
  return 0;
#endif
}

int
osip_ist_lock (osip_t * osip)
{
#ifdef OSIP_MT
  return osip_mutex_lock (ist_fastmutex);
#else
  return 0;
#endif
}

int
osip_ist_unlock (osip_t * osip)
{
#ifdef OSIP_MT
  return osip_mutex_unlock (ist_fastmutex);
#else
  return 0;
#endif
}

int
osip_nict_lock (osip_t * osip)
{
#ifdef OSIP_MT
  return osip_mutex_lock (nict_fastmutex);
#else
  return 0;
#endif
}

int
osip_nict_unlock (osip_t * osip)
{
#ifdef OSIP_MT
  return osip_mutex_unlock (nict_fastmutex);
#else
  return 0;
#endif
}

int
osip_nist_lock (osip_t * osip)
{
#ifdef OSIP_MT
  return osip_mutex_lock (nist_fastmutex);
#else
  return 0;
#endif
}

int
osip_nist_unlock (osip_t * osip)
{
#ifdef OSIP_MT
  return osip_mutex_unlock (nist_fastmutex);
#else
  return 0;
#endif
}

int
__osip_add_ict (osip_t * osip, osip_transaction_t * ict)
{
#ifdef OSIP_MT
  osip_mutex_lock (ict_fastmutex);
#endif
  osip_list_add (osip->osip_ict_transactions, ict, -1);
#ifdef OSIP_MT
  osip_mutex_unlock (ict_fastmutex);
#endif
  return 0;
}

int
__osip_add_ist (osip_t * osip, osip_transaction_t * ist)
{
#ifdef OSIP_MT
  osip_mutex_lock (ist_fastmutex);
#endif
  osip_list_add (osip->osip_ist_transactions, ist, -1);
#ifdef OSIP_MT
  osip_mutex_unlock (ist_fastmutex);
#endif
  return 0;
}

int
__osip_add_nict (osip_t * osip, osip_transaction_t * nict)
{
#ifdef OSIP_MT
  osip_mutex_lock (nict_fastmutex);
#endif
  osip_list_add (osip->osip_nict_transactions, nict, -1);
#ifdef OSIP_MT
  osip_mutex_unlock (nict_fastmutex);
#endif
  return 0;
}

int
__osip_add_nist (osip_t * osip, osip_transaction_t * nist)
{
#ifdef OSIP_MT
  osip_mutex_lock (nist_fastmutex);
#endif
  osip_list_add (osip->osip_nist_transactions, nist, -1);
#ifdef OSIP_MT
  osip_mutex_unlock (nist_fastmutex);
#endif
  return 0;
}

int
osip_remove_transaction (osip_t * osip, osip_transaction_t * tr)
{
  int i = -1;
  if (tr == NULL)
    return -1;
  if (tr->ctx_type == ICT)
    i = __osip_remove_ict_transaction (osip, tr);
  else if (tr->ctx_type == IST)
    i = __osip_remove_ist_transaction (osip, tr);
  else if (tr->ctx_type == NICT)
    i = __osip_remove_nict_transaction (osip, tr);
  else if (tr->ctx_type == NIST)
    i = __osip_remove_nist_transaction (osip, tr);
  else
    return -1;
  return i;
}

int
__osip_remove_ict_transaction (osip_t * osip, osip_transaction_t * ict)
{
  int pos = 0;
  osip_transaction_t *tmp;

#ifdef OSIP_MT
  osip_mutex_lock (ict_fastmutex);
#endif
  while (!osip_list_eol (osip->osip_ict_transactions, pos))
    {
      tmp = osip_list_get (osip->osip_ict_transactions, pos);
      if (tmp->transactionid == ict->transactionid)
	{
	  osip_list_remove (osip->osip_ict_transactions, pos);
#ifdef OSIP_MT
	  osip_mutex_unlock (ict_fastmutex);
#endif
	  return 0;
	}
      pos++;
    }
#ifdef OSIP_MT
  osip_mutex_unlock (ict_fastmutex);
#endif
  return -1;
}

int
__osip_remove_ist_transaction (osip_t * osip, osip_transaction_t * ist)
{
  int pos = 0;
  osip_transaction_t *tmp;

#ifdef OSIP_MT
  osip_mutex_lock (ist_fastmutex);
#endif
  while (!osip_list_eol (osip->osip_ist_transactions, pos))
    {
      tmp = osip_list_get (osip->osip_ist_transactions, pos);
      if (tmp->transactionid == ist->transactionid)
	{
	  osip_list_remove (osip->osip_ist_transactions, pos);
#ifdef OSIP_MT
	  osip_mutex_unlock (ist_fastmutex);
#endif
	  return 0;
	}
      pos++;
    }
#ifdef OSIP_MT
  osip_mutex_unlock (ist_fastmutex);
#endif
  return -1;
}

int
__osip_remove_nict_transaction (osip_t * osip, osip_transaction_t * nict)
{
  int pos = 0;
  osip_transaction_t *tmp;

#ifdef OSIP_MT