rule.h

用来作为linux中SIP SERVER,完成VOIP网络电话中服务器的功能

/*
 * $Id: rule.h,v 1.2 2003/10/22 14:15:55 janakj Exp $
 *
 * PERMISSIONS module
 *
 * Copyright (C) 2003 Mikl髎 Tirp醟 ([e-mail])
 *
 * 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:
 *    [e-mail]
 *
 * 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
 *
 */
 
#ifndef RULE_H
#define RULE_H 1

#include <regex.h>

#define EXPRESSION_LENGTH 100	/* maximum length of an expression */
#define LINE_LENGTH 500		/* maximum length of lines in the config file */


struct rule_struct;
typedef struct rule_struct rule;

struct expression_struct;
typedef struct expression_struct expression;
	
rule *new_rule(void);
void free_rule(rule *r);
void print_rule(rule *r);
int search_rule(rule *r, char *left, char *right);

expression *new_expression(char *str);
void free_expression(expression *e);
void print_expression(expression *e);
int search_expression(expression *e, char *value);

/*
 * stores an expression
 * value represents the string, and reg_value is the compiled string to POSIX regular expression
*/
struct expression_struct  {
	char	value[EXPRESSION_LENGTH+1];
	regex_t	*reg_value;
	struct expression_struct	*next;
};


/*
 * stores 4 lists of expressions in the following way:
 *
 * a, b, c EXCEPT d, e : f, g EXCEPT h
 * left = a, b, c
 * left_exceptions = d, e
 * right = f, g
 * right_exceptions = h
 */
struct rule_struct {
	expression *left, *left_exceptions, *right, *right_exceptions;
	struct rule_struct	*next;
};


#endif /* RULE_H */