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/*
* Copyright (C) 2006-2009 B.A.T.M.A.N. contributors:
*
* Thomas Lopatic
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*
*/
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <inttypes.h>
#include <net/if.h>
#include "../os.h"
#include "../batman.h"
#define IOCGETNWDEV 1
#ifndef SIOCGIWNAME
#define SIOCGIWNAME 0x8B01
#endif
static int get_integer_file(const char* filename)
{
FILE *f;
int32_t integer = 0;
int n;
if((f = fopen(filename, "r")) == NULL)
return 0;
n = fscanf(f, "%"SCNd32, &integer);
fclose(f);
if (n == 0 || n == EOF)
integer = 0;
return integer;
}
static void set_integer_file(const char* filename, int32_t integer)
{
FILE *f;
if ((f = fopen(filename, "w")) == NULL)
return;
fprintf(f, "%"PRId32, integer);
fclose(f);
}
void set_rp_filter(int32_t state, char* dev)
{
char filename[100], *colon_ptr;
/* if given interface is an alias use parent interface */
if ((colon_ptr = strchr(dev, ':')) != NULL)
*colon_ptr = '\0';
sprintf(filename, "/proc/sys/net/ipv4/conf/%s/rp_filter", dev);
set_integer_file(filename, state);
if (colon_ptr != NULL)
*colon_ptr = ':';
}
int32_t get_rp_filter(char *dev)
{
int32_t state = 0;
char filename[100], *colon_ptr;
/* if given interface is an alias use parent interface */
if ((colon_ptr = strchr(dev, ':')) != NULL)
*colon_ptr = '\0';
sprintf(filename, "/proc/sys/net/ipv4/conf/%s/rp_filter", dev);
state = get_integer_file(filename);
if (colon_ptr != NULL)
*colon_ptr = ':';
return state;
}
void set_send_redirects(int32_t state, char* dev)
{
char filename[100], *colon_ptr;
/* if given interface is an alias use parent interface */
if ((colon_ptr = strchr(dev, ':')) != NULL)
*colon_ptr = '\0';
sprintf(filename, "/proc/sys/net/ipv4/conf/%s/send_redirects", dev);
set_integer_file(filename, state);
if (colon_ptr != NULL)
*colon_ptr = ':';
}
int32_t get_send_redirects(char *dev)
{
int32_t state = 0;
char filename[100], *colon_ptr;
/* if given interface is an alias use parent interface */
if ((colon_ptr = strchr(dev, ':')) != NULL)
*colon_ptr = '\0';
sprintf(filename, "/proc/sys/net/ipv4/conf/%s/send_redirects", dev);
state = get_integer_file(filename);
if (colon_ptr != NULL)
*colon_ptr = ':';
return state;
}
void set_forwarding(int32_t state)
{
set_integer_file("/proc/sys/net/ipv4/ip_forward", state);
}
int32_t get_forwarding(void)
{
return get_integer_file("/proc/sys/net/ipv4/ip_forward");
}
int8_t bind_to_iface(int32_t sock, char *dev)
{
char *colon_ptr;
/* if given interface is an alias bind to parent interface */
if ((colon_ptr = strchr(dev, ':')) != NULL)
*colon_ptr = '\0';
if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, dev, strlen(dev) + 1) < 0) {
if (colon_ptr != NULL)
*colon_ptr = ':';
return -1;
}
if (colon_ptr != NULL)
*colon_ptr = ':';
return 1;
}
int32_t use_gateway_module(void)
{
int32_t fd;
if ((fd = open("/dev/batgat", O_WRONLY)) < 0) {
debug_output(0, "Warning - batgat kernel modul interface (/dev/batgat) not usable: %s\nThis may decrease the performance of batman!\n", strerror(errno));
return -1;
}
return fd;
}
int is_wifi_interface(char *dev, int fd)
{
struct ifreq int_req;
char *colon_ptr;
memset(&int_req, 0, sizeof (struct ifreq));
strncpy(int_req.ifr_name, dev, IFNAMSIZ - 1);
if ((colon_ptr = strchr(int_req.ifr_name, ':')) != NULL)
*colon_ptr = '\0';
if (ioctl(fd, SIOCGIWNAME, &int_req) >= 0)
return 1;
return 0;
}
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