mirror of
https://github.com/yarrick/iodine.git
synced 2024-11-03 06:57:27 +00:00
149 lines
2.9 KiB
C
149 lines
2.9 KiB
C
/*
|
|
* Copyright (c) 2006 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <stdint.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <err.h>
|
|
|
|
#include "tun.h"
|
|
|
|
#define TUN_MAX_TRY 50
|
|
|
|
char *tun_device = NULL;
|
|
|
|
#ifdef LINUX
|
|
|
|
#include <sys/ioctl.h>
|
|
#include <net/if.h>
|
|
#include <linux/if_tun.h>
|
|
|
|
int
|
|
open_tun()
|
|
{
|
|
int i;
|
|
int tun_fd;
|
|
struct ifreq ifreq;
|
|
|
|
if (tun_device == NULL)
|
|
tun_device = "/dev/net/tun";
|
|
|
|
if ((tun_fd = open(tun_device, O_RDWR)) < 0) {
|
|
warn("open_tun: %s: %s", tun_device, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
bzero(&ifreq, sizeof(ifreq));
|
|
|
|
ifreq.ifr_flags = IFF_TUN;
|
|
|
|
for (i = 0; i < TUN_MAX_TRY; i++) {
|
|
snprintf(ifreq.ifr_name, IFNAMSIZ, "dns%d", i);
|
|
|
|
if (ioctl(tun_fd, TUNSETIFF, (void *) &ifreq) != -1) {
|
|
printf("Opened %s\n", ifreq.ifr_name);
|
|
return tun_fd;
|
|
}
|
|
|
|
if (errno != EBUSY) {
|
|
warn("open_tun: ioctl[TUNSETIFF]: %s", strerror(errno));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
warn("open_tun: Couldn't set interface name.\n");
|
|
|
|
return -1;
|
|
}
|
|
|
|
#else /* BSD */
|
|
|
|
int
|
|
open_tun()
|
|
{
|
|
int i;
|
|
int tun_fd;
|
|
char tun_name[50];
|
|
|
|
if (tun_device != NULL) {
|
|
if ((tun_fd = open(tun_device, O_RDWR)) < 0) {
|
|
warn("open_tun: %s: %s", tun_device, strerror(errno));
|
|
return -1;
|
|
}
|
|
} else {
|
|
for (i = 0; i < TUN_MAX_TRY; i++) {
|
|
snprintf(tun_name, sizeof(tun_name), "/dev/tun%d", i);
|
|
|
|
if ((tun_fd = open(tun_name, O_RDWR)) >= 0) {
|
|
printf("Opened %s\n", tun_name);
|
|
return tun_fd;
|
|
}
|
|
|
|
if (errno == ENOENT)
|
|
break;
|
|
}
|
|
|
|
warn("open_tun: Failed to open tunneling device.");
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
#endif /* LINUX */
|
|
|
|
void
|
|
close_tun(int tun_fd)
|
|
{
|
|
if (tun_fd >= 0)
|
|
close(tun_fd);
|
|
}
|
|
|
|
int
|
|
write_tun(int tun_fd, char *data, int len)
|
|
{
|
|
#ifdef LINUX
|
|
data[0] = 0x00;
|
|
data[1] = 0x00;
|
|
data[2] = 0x08;
|
|
data[3] = 0x00;
|
|
#else /* LINUX */
|
|
data[0] = 0x00;
|
|
data[1] = 0x00;
|
|
data[2] = 0x00;
|
|
data[3] = 0x02;
|
|
#endif /* !LINUX */
|
|
|
|
if (write(tun_fd, data, len) != len) {
|
|
warn("write_tun");
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
read_tun(int tun_fd, char *buf, int len)
|
|
{
|
|
return read(tun_fd, buf, len);
|
|
}
|
|
|