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/*
* Copyright (c) 2005-2009 FAUmachine Team.
* Copyright 2002 Jeff Dike
*
* (taken from the www.user-mode-linux.org CVS Repository and adapted to
* FAUmachine)
*
* Licensed under the GPL
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 dated June, 1991.
*/
#include "config.h"
#include <stdio.h>
#ifdef HAVE_LINUX_IF_TUN_H
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <pwd.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <linux/if_tun.h>
static void Usage(char * name) __attribute__((__noreturn__));
static void Usage(char * name)
{
fprintf(stderr, "Create: %s [-b] [-u owner] [-t device-name] "
"[-f tun-clone-device]\n",
name);
fprintf(stderr, "Delete: %s -d device-name [-f tun-clone-device]\n\n",
name);
fprintf(stderr, "The default tun clone device is /dev/net/tun - some"
" systems use\n/dev/misc/net/tun instead\n\n");
fprintf(stderr, "-b will result in brief output (just the device name)\n");
exit(1);
}
int main(int argc, char **argv)
{
struct ifreq ifr;
struct passwd *pw;
long owner = geteuid();
int tap_fd, opt, delete = 0, brief = 0;
const char * tun = "";
const char * file = "/dev/net/tun";
char * name = argv[0];
char * end;
while ((opt = getopt(argc, argv, "bd:f:t:u:")) > 0) {
switch (opt) {
case 'b':
brief = 1;
break;
case 'd':
delete = 1;
tun = optarg;
break;
case 'f':
file = optarg;
break;
case 'u':
pw = getpwnam(optarg);
if (pw != NULL) {
owner = pw->pw_uid;
break;
}
owner = strtol(optarg, &end, 0);
if (*end != '\0') {
fprintf(stderr, "'%s' is neither a username "
"nor a numeric uid.\n",
optarg);
Usage(name);
}
break;
case 't':
tun = optarg;
break;
case 'h':
default:
Usage(name);
};
}
argv += optind;
argc -= optind;
if (argc > 0) {
Usage(name);
}
if ((tap_fd = open(file, O_RDWR)) < 0) {
fprintf(stderr, "Failed to open '%s' : ", file);
perror("");
exit(1);
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
strncpy(ifr.ifr_name, tun, sizeof(ifr.ifr_name) - 1);
if (ioctl(tap_fd, TUNSETIFF, (void *) &ifr) < 0) {
perror("TUNSETIFF");
exit(1);
}
if (delete) {
if (ioctl(tap_fd, TUNSETPERSIST, 0) < 0) {
perror("TUNSETPERSIST");
exit(1);
}
printf("Set '%s' nonpersistent\n", ifr.ifr_name);
} else {
if (ioctl(tap_fd, TUNSETPERSIST, 1) < 0) {
perror("TUNSETPERSIST");
exit(1);
}
if (ioctl(tap_fd, TUNSETOWNER, owner) < 0) {
perror("TUNSETPERSIST");
exit(1);
}
if (brief) {
printf("%s\n", ifr.ifr_name);
} else {
printf("Set '%s' persistent and owned by uid %ld\n",
ifr.ifr_name, owner);
}
}
(void) close(tap_fd);
return 0;
}
#else /* HAVE_LINUX_IF_TUN_H */
int main(int argc, char **argv)
{
fprintf(stderr, "You did not have <linux/if_tun.h> when compiling\n");
fprintf(stderr, "this, so probably your system doesn't support the\n");
fprintf(stderr, "type of devices this tool tries to set up.\n");
return 1;
}
#endif /* HAVE_LINUX_IF_TUN_H */
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