mirror of
https://github.com/yarrick/iodine.git
synced 2024-06-26 17:29:20 +03:00
118 lines
2.3 KiB
C
118 lines
2.3 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 <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <err.h>
|
|
|
|
#include "tun.h"
|
|
#include "dns.h"
|
|
#include "dnsd.h"
|
|
|
|
#define MAX(a,b) ((a)>(b)?(a):(b))
|
|
|
|
int running = 1;
|
|
|
|
|
|
static void
|
|
sigint(int sig) {
|
|
running = 0;
|
|
}
|
|
|
|
static int
|
|
tunnel(int tun_fd, int dns_fd)
|
|
{
|
|
int i;
|
|
int read;
|
|
fd_set fds;
|
|
struct timeval tv;
|
|
struct tun_frame *frame;
|
|
|
|
frame = malloc(64*1024);
|
|
|
|
while (running) {
|
|
tv.tv_sec = 1;
|
|
tv.tv_usec = 0;
|
|
|
|
FD_ZERO(&fds);
|
|
if(!dnsd_haspacket())
|
|
FD_SET(tun_fd, &fds);
|
|
FD_SET(dns_fd, &fds);
|
|
|
|
i = select(MAX(tun_fd, dns_fd) + 1, &fds, NULL, NULL, &tv);
|
|
|
|
if(i < 0) {
|
|
if (running) {
|
|
warn("select");
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
if(i != 0) {
|
|
if(FD_ISSET(tun_fd, &fds)) {
|
|
read = read_tun(tun_fd, frame, 64*1024);
|
|
if(read > 0)
|
|
dnsd_queuepacket(frame->data, read - 4);
|
|
}
|
|
if(FD_ISSET(dns_fd, &fds)) {
|
|
read = dnsd_read(dns_fd, frame->data, 64*1024-4);
|
|
if(read > 0) {
|
|
frame->flags = htons(0x0000);
|
|
frame->proto = htons(0x0800);
|
|
write_tun(tun_fd, frame, read + 4);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
free(frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
int tun_fd;
|
|
int dnsd_fd;
|
|
|
|
if (argc != 2) {
|
|
printf("Usage: %s topdomain\n", argv[0]);
|
|
exit(2);
|
|
}
|
|
|
|
tun_fd = open_tun();
|
|
dnsd_fd = open_dnsd(argv[1]);
|
|
|
|
signal(SIGINT, sigint);
|
|
|
|
tunnel(tun_fd, dnsd_fd);
|
|
|
|
printf("Closing tunnel\n");
|
|
|
|
close_dnsd(dnsd_fd);
|
|
close_tun(tun_fd);
|
|
|
|
return 0;
|
|
}
|