iodine/dnstun.c

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/*
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* Copyright (c) 2006 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
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*
* 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>
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#include <string.h>
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#include <signal.h>
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#include <unistd.h>
#include <sys/types.h>
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#include <sys/stat.h>
#include <fcntl.h>
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#include <err.h>
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#include <arpa/inet.h>
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#include "tun.h"
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#include "dns.h"
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#ifndef MAX
#define MAX(a,b) ((a)>(b)?(a):(b))
#endif
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#define FRAMESIZE (64*1024)
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int running = 1;
static void
sigint(int sig) {
running = 0;
}
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static int
tunnel(int tun_fd, int dns_fd)
{
int i;
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int read;
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fd_set fds;
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struct timeval tv;
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struct tun_frame *frame;
frame = malloc(FRAMESIZE);
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while (running) {
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tv.tv_sec = 1;
tv.tv_usec = 0;
FD_ZERO(&fds);
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if (!dns_sending()) {
FD_SET(tun_fd, &fds);
}
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FD_SET(dns_fd, &fds);
i = select(MAX(tun_fd, dns_fd) + 1, &fds, NULL, NULL, &tv);
if(i < 0) {
if (running) {
warn("select");
}
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return 1;
}
if(i == 0) {
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dns_ping(dns_fd);
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} else {
if(FD_ISSET(tun_fd, &fds)) {
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read = read_tun(tun_fd, frame, FRAMESIZE);
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if (read > 0) {
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printf("%04x\n", frame->proto);
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printf("Got data on tun! %d bytes\n", read);
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dns_handle_tun(dns_fd, frame->data, read - 4);
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}
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}
if(FD_ISSET(dns_fd, &fds)) {
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read = dns_read(dns_fd, frame->data, FRAMESIZE-4);
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if (read > 0) {
printf("Got data on dns! %d bytes\n", read);
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//frame->flags = htons(0x0000);
//frame->proto = htons(0x0200);
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write_tun(tun_fd, frame, read + 4);
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}
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}
}
}
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free(frame);
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return 0;
}
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int
main(int argc, char **argv)
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{
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int tun_fd;
int dns_fd;
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if (argc != 3) {
printf("Usage: %s nameserver topdomain\n", argv[0]);
exit(2);
}
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tun_fd = open_tun();
dns_fd = open_dns(argv[1], argv[2]);
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signal(SIGINT, sigint);
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tunnel(tun_fd, dns_fd);
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printf("Closing tunnel\n");
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close_dns(dns_fd);
close_tun(tun_fd);
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return 0;
}