contrib/fwd/src/fwd_utils.c

   1 /*
   2  * fwd - OpenWrt firewall daemon - commmon utility functions
   3  *
   4  *   Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
   5  *
   6  * The fwd program is free software: you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * The fwd program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with the fwd program. If not, see http://www.gnu.org/licenses/.
  17  */
  18
  19
  20 #include "fwd_utils.h"
  21
  22
  23 void fwd_log_init(void)
  24 {
  25         openlog("Firewall", 0, LOG_DAEMON | LOG_PERROR);
  26 }
  27
  28 void __fwd_log(int prio, const char *msg, ...)
  29 {
  30         va_list ap;
  31         va_start(ap, msg);
  32         vsyslog(prio, msg, ap);
  33         va_end(ap);
  34 }
  35
  36
  37
  38 int fwd_empty_cidr(struct fwd_cidr *c)
  39 {
  40         if( (c == NULL) || ((c->addr.s_addr == 0) && (c->prefix == 0)) )
  41                 return 1;
  42
  43         return 0;
  44 }
  45
  46 int fwd_equal_cidr(struct fwd_cidr *a, struct fwd_cidr *b)
  47 {
  48         if( fwd_empty_cidr(a) && fwd_empty_cidr(b) )
  49                 return 1;
  50         else if( (a->addr.s_addr == b->addr.s_addr) && (a->prefix == b->prefix) )
  51                 return 1;
  52
  53         return 0;
  54 }
  55
  56 void fwd_update_cidr(struct fwd_cidr *a, struct fwd_cidr *b)
  57 {
  58         if( a != NULL )
  59         {
  60                 a->addr.s_addr = b ? b->addr.s_addr : 0;
  61                 a->prefix = b ? b->prefix : 0;
  62         }
  63 }
  64
  65
  66 /* fwd_zmalloc(size_t)
  67  * Allocates a zeroed buffer of the given size. */
  68 void * fwd_zmalloc(size_t s)
  69 {
  70         void *b = malloc(s);
  71
  72         if( b != NULL )
  73                 memset(b, 0, s);
  74
  75         return b;
  76 }
  77
  78