script_cb.c
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 /*
  * $Id$
  *
  * Script callbacks -- they add the ability to register callback
  * functions which are always called when script for request
  * processing is entered or left
  *
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  *
  * Copyright (C) 2001-2003 Fhg Fokus
  *
  * This file is part of ser, a free SIP server.
  *
  * ser 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
  *
  * For a license to use the ser software under conditions
  * other than those described here, or to purchase support for this
  * software, please contact iptel.org by e-mail at the following addresses:
  *    info@iptel.org
  *
  * ser 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
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  */
 
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 #include <stdlib.h>
 #include "script_cb.h"
 #include "dprint.h"
 #include "error.h"
 
 static struct script_cb *pre_cb=0;
 static struct script_cb *post_cb=0;
 static unsigned int cb_id=0;
 
 int register_script_cb( cb_function f, callback_t t, void *param )
 {
 	struct script_cb *new_cb;
 
 	new_cb=malloc(sizeof(struct script_cb));
 	if (new_cb==0) {
 		LOG(L_ERR, "ERROR: register_script_cb: out of memory\n");
 		return E_OUT_OF_MEM;
 	}
 	new_cb->cbf=f;
 	new_cb->id=cb_id++;
 	new_cb->param=param;
 	/* insert into appropriate list */
 	if (t==PRE_SCRIPT_CB) {
 		new_cb->next=pre_cb;
 		pre_cb=new_cb;
 	} else if (t==POST_SCRIPT_CB) {
 		new_cb->next=post_cb;
 		post_cb=new_cb;
 	} else {
 		LOG(L_CRIT, "ERROR: register_script_cb: unknown CB type\n");
 		return E_BUG;
 	}
 	/* ok, callback installed */
 	return 1;
 }
 
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 int exec_pre_cb( struct sip_msg *msg)
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 {
 	struct script_cb *i;
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 	for (i=pre_cb; i; i=i->next) {
 		/* stop on error */
 		if (i->cbf(msg, i->param)==0)
 			return 0;
 	}
 	return 1;
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 }
 
 void exec_post_cb( struct sip_msg *msg)
 {
 	struct script_cb *i;
 	for (i=post_cb; i; i=i->next) i->cbf(msg, i->param);
 }