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contrib/fwd: add utility functions

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This commit is contained in:
Jo-Philipp Wich 2009-12-20 02:30:32 +00:00
parent ea9a0495b7
commit 1c2d85856b
2 changed files with 128 additions and 0 deletions
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78
contrib/fwd/src/fwd_utils.c Normal file
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/*
* fwd - OpenWrt firewall daemon - commmon utility functions
*
* Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
*
* The fwd program is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* The fwd program 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 the fwd program. If not, see http://www.gnu.org/licenses/.
*/
#include "fwd_utils.h"
void fwd_log_init(void)
{
openlog("Firewall", 0, LOG_DAEMON | LOG_PERROR);
}
void __fwd_log(int prio, const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
vsyslog(prio, msg, ap);
va_end(ap);
}
int fwd_empty_cidr(struct fwd_cidr *c)
{
if( (c == NULL) || ((c->addr.s_addr == 0) && (c->prefix == 0)) )
return 1;
return 0;
}
int fwd_equal_cidr(struct fwd_cidr *a, struct fwd_cidr *b)
{
if( fwd_empty_cidr(a) && fwd_empty_cidr(b) )
return 1;
else if( (a->addr.s_addr == b->addr.s_addr) && (a->prefix == b->prefix) )
return 1;
return 0;
}
void fwd_update_cidr(struct fwd_cidr *a, struct fwd_cidr *b)
{
if( a != NULL )
{
a->addr.s_addr = b ? b->addr.s_addr : 0;
a->prefix = b ? b->prefix : 0;
}
}
/* fwd_zmalloc(size_t)
* Allocates a zeroed buffer of the given size. */
void * fwd_zmalloc(size_t s)
{
void *b = malloc(s);
if( b != NULL )
memset(b, 0, s);
return b;
}

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contrib/fwd/src/fwd_utils.h Normal file
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/*
* fwd - OpenWrt firewall daemon - commmon utility header
*
* Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
*
* The fwd program is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* The fwd program 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 the fwd program. If not, see http://www.gnu.org/licenses/.
*/
#ifndef __FWD_UTILS_H__
#define __FWD_UTILS_H__
#include <syslog.h>
#include "fwd.h"
void fwd_log_init(void);
void __fwd_log(int, const char *, ...);
#define fwd_log_info(...) __fwd_log(LOG_INFO, __VA_ARGS__)
#define fwd_log_err(...) __fwd_log(LOG_ERR, __VA_ARGS__)
int fwd_empty_cidr(struct fwd_cidr *);
int fwd_equal_cidr(struct fwd_cidr *, struct fwd_cidr *);
void fwd_update_cidr(struct fwd_cidr *, struct fwd_cidr *);
/* fwd_zmalloc(size_t)
* Allocates a zeroed buffer of the given size. */
void * fwd_zmalloc(size_t);
/* fwd_alloc_ptr(type)
* Allocates a buffer with the size of the given datatype
* and returns a pointer to it. */
#define fwd_alloc_ptr(t) (t *) fwd_zmalloc(sizeof(t))
/* fwd_free_ptr(void *)
* Frees the given pointer and sets it to NULL.
* Safe for NULL values. */
#define fwd_free_ptr(x) do { if(x != NULL) free(x); x = NULL; } while(0)
#endif