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124 lines
2.5 KiB
C
124 lines
2.5 KiB
C
/*
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* Copyright (c) 2006 Bjorn Andersson <flex@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 <unistd.h>
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#include <string.h>
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#include <errno.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 "tun.h"
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#define TUN_MAX_TRY 50
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int tun_fd = -1;
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char *tun_device = NULL;
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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()
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{
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struct ifreq ifreq;
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int i;
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if (tun_device == NULL)
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tun_device = "/dev/net/tun";
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if ((tun_fd = open(tun_device, O_RDWR)) < 0)
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err(1, "open_tun: %s: %s", tun_device, strerror(errno));
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bzero(&ifreq, sizeof(ifreq));
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ifreq.ifr_flags = IFF_TUN;
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for (i = 0; i < TUN_MAX_TRY; i++) {
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snprintf(ifreq.ifr_name, IFNAMSIZ, "tun%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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return 0;
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}
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if (errno != EBUSY)
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err(1, "open_tun: ioctl[TUNSETIFF]: %s", strerror(errno));
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}
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err(1, "open_tun: Couldn't set interface name.\n");
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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()
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{
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if (tun_device != NULL) {
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if ((tun_fd = open(tun_device, O_RDWR)) < 0)
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err(1, "open_tun: %s: %s", tun_device, strerror(errno));
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} else {
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char tun_name[50];
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int i;
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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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return 0;
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if (errno == ENOENT)
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break;
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}
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err(1, "open_tun: Failed to open tunneling device.");
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}
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return 0;
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}
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#endif /* LINUX */
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void
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close_tun()
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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(u_char *buf, int len)
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{
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if (write(tun_fd, buf, len) != len)
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err(1, "write_tun: %s", strerror(errno));
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return 0;
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}
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int
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read_tun(u_char *buf, int len)
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{
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return read(tun_fd, buf, len);
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}
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