/*

  *

  * Copyright (C) 2001-2003 FhG Fokus

  *

  * This file is part of Kamailio, a free SIP server.

  *

  * Kamailio 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
  *

  * Kamailio 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

  */

 /*!
 * \file
 * \brief Kamailio core :: Name/alias handling
 * \author andrei
 * \ingroup core
 * Module: \ref core
 */

 #include "str.h"
 #include "dprint.h"

 #include "mem/mem.h"

 
 
 
 struct host_alias{
 	str alias;

 	unsigned short port;

 	unsigned short proto;

 	struct host_alias* next;
 };
 
 
 extern struct host_alias* aliases;
 
 
 

 /** returns 1 if  name is in the alias list; if port=0, port no is ignored

  * if proto=0, proto is ignored*/
 static inline int grep_aliases(char* name, int len, unsigned short port,
 								unsigned short proto)

 {
 	struct  host_alias* a;
 	

 	if ((len>2)&&((*name)=='[')&&(name[len-1]==']')){
 		/* ipv6 reference, skip [] */
 		name++;
 		len-=2;
 	}

 	for(a=aliases;a;a=a->next)

 		if ((a->alias.len==len) && ((a->port==0) || (port==0) || 

 				(a->port==port)) && ((a->proto==0) || (proto==0) || 
 				(a->proto==proto)) && (strncasecmp(a->alias.s, name, len)==0))

 			return 1;
 	return 0;
 }
 
 
 

 /** adds an alias to the list (only if it isn't already there)

  * if port==0, the alias will match all the ports

  * if proto==0, the alias will match all the protocols
  * returns 1 if a new alias was added, 0 if a matching alias was already on
  * the list and  -1 on error */
 static inline int add_alias(char* name, int len, unsigned short port, 
 								unsigned short proto)

 {
 	struct host_alias* a;
 	

 	if ((port) && (proto)){
 		/* don't add if there is already an alias matching it */
 		if (grep_aliases(name,len, port, proto)) return 0;
 	}else{
 		/* don't add if already in the list with port or proto ==0*/
 		for(a=aliases;a;a=a->next)
 			if ((a->alias.len==len) && (a->port==port) && (a->proto==proto) &&
 					(strncasecmp(a->alias.s, name, len)==0))
 				return 0;
 	}

 	a=(struct host_alias*)pkg_malloc(sizeof(struct host_alias));

 	if(a==0) goto error;

 	a->alias.s=(char*)pkg_malloc(len+1);

 	if (a->alias.s==0) goto error;
 	a->alias.len=len;
 	memcpy(a->alias.s, name, len);
 	a->alias.s[len]=0; /* null terminate for easier printing*/

 	a->port=port;

 	a->proto=proto;

 	a->next=aliases;
 	aliases=a;
 	return 1;
 error:

 	LM_ERR("memory allocation error\n");

 	if (a) pkg_free(a);

 	return -1;
 }