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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  *
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  * Copyright (C) 2001-2003 FhG Fokus
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  *
  * 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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  *
  * History:
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  * --------
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  *  2003-03-29  cleaning pkg allocation introduced (jiri)
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  *  2003-03-19  replaced all mallocs/frees w/ pkg_malloc/pkg_free (andrei)
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  *  2005-02-13  script callbacks devided into request and reply types (bogdan)
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  */
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 #include <stdlib.h>
 #include "script_cb.h"
 #include "dprint.h"
 #include "error.h"
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 #include "mem/mem.h"
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 static struct script_cb *pre_req_cb=0;
 static struct script_cb *post_req_cb=0;
 
 static struct script_cb *pre_rpl_cb=0;
 static struct script_cb *post_rpl_cb=0;
 
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 static unsigned int cb_id=0;
 
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 static inline int add_callback( struct script_cb **list,
 	cb_function f, void *param)
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 {
 	struct script_cb *new_cb;
 
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 	new_cb=pkg_malloc(sizeof(struct script_cb));
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 	if (new_cb==0) {
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 		LOG(L_ERR, "ERROR:add_script_callback: out of memory\n");
 		return -1;
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 	}
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 	new_cb->cbf = f;
 	new_cb->id = cb_id++;
 	new_cb->param = param;
 	/* link at the beginning of the list */
 	new_cb->next = *list;
 	*list = new_cb;
 	return 0;
 }
 
 
 int register_script_cb( cb_function f, int type, void *param )
 {
 	/* type checkings */
 	if ( (type&(REQ_TYPE_CB|RPL_TYPE_CB))==0 ) {
 		LOG(L_CRIT,"BUG:register_script_cb: REQUEST or REPLY "
 			"type not specified\n");
 		goto error;
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 	}
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 	if ( (type&(PRE_SCRIPT_CB|POST_SCRIPT_CB))==0 ||
 	(type&PRE_SCRIPT_CB && type&POST_SCRIPT_CB) ) {
 		LOG(L_CRIT,"BUG:register_script_cb: callback POST or PRE type must "
 			"be exactly one\n");
 		goto error;
 	}
 
 	if (type&REQ_TYPE_CB) {
 		/* callback for request script */
 		if (type&PRE_SCRIPT_CB) {
 			if (add_callback( &pre_req_cb, f, param)<0)
 				goto add_error;
 		} else if (type&POST_SCRIPT_CB) {
 			if (add_callback( &post_req_cb, f, param)<0)
 				goto add_error;
 		}
 	}
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 	if (type&RPL_TYPE_CB) {
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 		/* callback (also) for reply script */
 		if (type&PRE_SCRIPT_CB) {
 			if (add_callback( &pre_rpl_cb, f, param)<0)
 				goto add_error;
 		} else if (type&POST_SCRIPT_CB) {
 			if (add_callback( &post_rpl_cb, f, param)<0)
 				goto add_error;
 		}
 	}
 
 	return 0;
 add_error:
 	LOG(L_ERR,"ERROR:register_script_cb: failed to add callback\n");
 error:
 	return -1;
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 }
 
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 static inline void destroy_cb_list(struct script_cb **list)
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 {
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 	struct script_cb *foo;
 
 	while( *list ) {
 		foo = *list;
 		*list = (*list)->next;
 		pkg_free( foo );
 	}
 }
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 void destroy_script_cb()
 {
 	destroy_cb_list( &pre_req_cb  );
 	destroy_cb_list( &post_req_cb );
 	destroy_cb_list( &pre_rpl_cb  );
 	destroy_cb_list( &post_req_cb );
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 }
 
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 static inline int exec_pre_cb( struct sip_msg *msg, struct script_cb *cb)
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 {
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 	for ( ; cb ; cb=cb->next ) {
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 		/* stop on error */
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 		if (cb->cbf(msg, cb->param)==0)
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 			return 0;
 	}
 	return 1;
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 }
 
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 static inline int exec_post_cb( struct sip_msg *msg, struct script_cb *cb)
 {
 	for ( ; cb ; cb=cb->next){
 		cb->cbf( msg, cb->param);
 	}
 	return 1;
 }
 
 
 int exec_pre_req_cb( struct sip_msg *msg)
 {
 	return exec_pre_cb( msg, pre_req_cb);
 }
 
 int exec_pre_rpl_cb( struct sip_msg *msg)
 {
 	return exec_pre_cb( msg, pre_rpl_cb);
 }
 
 int exec_post_req_cb( struct sip_msg *msg)
 {
 	return exec_post_cb( msg, post_req_cb);
 }
 
 int exec_post_rpl_cb( struct sip_msg *msg)
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 {
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 	return exec_post_cb( msg, post_rpl_cb);
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 }