mirror of
https://github.com/yarrick/iodine.git
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234 lines
4.7 KiB
C
234 lines
4.7 KiB
C
/*
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* Copyright (c) 2006 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <err.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include "tun.h"
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#define TUN_MAX_TRY 50
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char if_name[50];
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#ifdef LINUX
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <linux/if_tun.h>
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int
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open_tun(const char *tun_device)
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{
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int i;
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int tun_fd;
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struct ifreq ifreq;
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char *tunnel = "/dev/net/tun";
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if ((tun_fd = open(tunnel, O_RDWR)) < 0) {
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warn("open_tun: %s: %s", tunnel, strerror(errno));
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return -1;
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}
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bzero(&ifreq, sizeof(ifreq));
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ifreq.ifr_flags = IFF_TUN;
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if (tun_device != NULL) {
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strncpy(ifreq.ifr_name, tun_device, IFNAMSIZ);
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strncpy(if_name, tun_device, sizeof(if_name));
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if (ioctl(tun_fd, TUNSETIFF, (void *) &ifreq) != -1) {
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printf("Opened %s\n", ifreq.ifr_name);
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return tun_fd;
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}
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if (errno != EBUSY) {
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warn("open_tun: ioctl[TUNSETIFF]: %s", strerror(errno));
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return -1;
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}
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} else {
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for (i = 0; i < TUN_MAX_TRY; i++) {
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snprintf(ifreq.ifr_name, IFNAMSIZ, "dns%d", i);
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if (ioctl(tun_fd, TUNSETIFF, (void *) &ifreq) != -1) {
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printf("Opened %s\n", ifreq.ifr_name);
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snprintf(if_name, sizeof(if_name), "dns%d", i);
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return tun_fd;
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}
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if (errno != EBUSY) {
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warn("open_tun: ioctl[TUNSETIFF]: %s", strerror(errno));
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return -1;
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}
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}
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warn("open_tun: Couldn't set interface name");
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}
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return -1;
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}
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#else /* BSD */
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int
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open_tun(const char *tun_device)
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{
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int i;
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int tun_fd;
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char tun_name[50];
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if (tun_device != NULL) {
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snprintf(tun_name, sizeof(tun_name), "/dev/%s", tun_device);
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strncpy(if_name, tun_device, sizeof(if_name));
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if ((tun_fd = open(tun_name, O_RDWR)) < 0) {
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warn("open_tun: %s: %s", tun_name, strerror(errno));
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return -1;
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}
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printf("Opened %s\n", tun_name);
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return tun_fd;
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} else {
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for (i = 0; i < TUN_MAX_TRY; i++) {
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snprintf(tun_name, sizeof(tun_name), "/dev/tun%d", i);
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if ((tun_fd = open(tun_name, O_RDWR)) >= 0) {
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printf("Opened %s\n", tun_name);
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snprintf(if_name, sizeof(if_name), "tun%d", i);
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return tun_fd;
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}
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if (errno == ENOENT)
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break;
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}
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warn("open_tun: Failed to open tunneling device");
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}
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return -1;
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}
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#endif /* !LINUX */
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void
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close_tun(int tun_fd)
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{
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if (tun_fd >= 0)
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close(tun_fd);
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}
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int
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write_tun(int tun_fd, char *data, int len)
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{
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#if defined (FREEBSD) || defined (DARWIN)
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data += 4;
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len -= 4;
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#else /* !FREEBSD/DARWIN */
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#ifdef LINUX
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data[0] = 0x00;
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data[1] = 0x00;
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data[2] = 0x08;
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data[3] = 0x00;
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#else /* OPENBSD */
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data[0] = 0x00;
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data[1] = 0x00;
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data[2] = 0x00;
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data[3] = 0x02;
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#endif /* !LINUX */
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#endif /* FREEBSD */
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if (write(tun_fd, data, len) != len) {
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warn("write_tun");
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return 1;
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}
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return 0;
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}
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int
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read_tun(int tun_fd, char *buf, int len)
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{
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#if defined (FREEBSD) || defined (DARWIN)
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// FreeBSD has no header
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return read(tun_fd, buf + 4, len - 4) + 4;
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#else /* !FREEBSD */
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return read(tun_fd, buf, len);
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#endif /* !FREEBSD */
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}
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int
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tun_setip(const char *ip)
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{
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char cmdline[512];
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if (inet_addr(ip) != INADDR_NONE) {
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snprintf(cmdline, sizeof(cmdline),
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"/sbin/ifconfig %s %s %s netmask 255.255.255.0",
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if_name,
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ip,
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ip);
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printf("Setting IP of %s to %s\n", if_name, ip);
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#ifndef LINUX
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int r;
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r = system(cmdline);
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if(r != 0) {
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return r;
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} else {
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snprintf(cmdline, sizeof(cmdline),
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"/sbin/route add %s/24 %s",
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ip, ip);
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}
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printf("Adding route %s/24 to %s\n", ip, ip);
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#endif
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return system(cmdline);
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} else {
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printf("Invalid IP: %s!\n", ip);
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}
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return 1;
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}
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int
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tun_setmtu(const int mtu)
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{
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char cmdline[512];
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if (mtu > 200 && mtu < 1500) {
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snprintf(cmdline, sizeof(cmdline),
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"/sbin/ifconfig %s mtu %d",
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if_name,
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mtu);
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printf("Setting MTU of %s to %d\n", if_name, mtu);
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return system(cmdline);
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} else {
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warn("MTU out of range: %d\n", mtu);
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}
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return 1;
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}
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