mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-11-28 22:20:28 +00:00
5e34ff29bc
and SKIP_XXXX to IF_NOT_XXXX - the second one was especially badly named. It was not skipping anything!
140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* tun devices controller
|
|
*
|
|
* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
|
|
*
|
|
* Original code:
|
|
* Jeff Dike
|
|
*
|
|
* Licensed under GPLv2, see file LICENSE in this tarball for details.
|
|
*/
|
|
#include <netinet/in.h>
|
|
#include <net/if.h>
|
|
#include <linux/if_tun.h>
|
|
#include "libbb.h"
|
|
|
|
/* TUNSETGROUP appeared in 2.6.23 */
|
|
#ifndef TUNSETGROUP
|
|
#define TUNSETGROUP _IOW('T', 206, int)
|
|
#endif
|
|
|
|
#define IOCTL(a, b, c) ioctl_or_perror_and_die(a, b, c, NULL)
|
|
|
|
#if 1
|
|
|
|
int tunctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int tunctl_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
struct ifreq ifr;
|
|
int fd;
|
|
const char *opt_name = "tap%d";
|
|
const char *opt_device = "/dev/net/tun";
|
|
#if ENABLE_FEATURE_TUNCTL_UG
|
|
const char *opt_user, *opt_group;
|
|
long user = -1, group = -1;
|
|
#endif
|
|
unsigned opts;
|
|
|
|
enum {
|
|
OPT_f = 1 << 0, // control device name (/dev/net/tun)
|
|
OPT_t = 1 << 1, // create named interface
|
|
OPT_d = 1 << 2, // delete named interface
|
|
#if ENABLE_FEATURE_TUNCTL_UG
|
|
OPT_u = 1 << 3, // set new interface owner
|
|
OPT_g = 1 << 4, // set new interface group
|
|
OPT_b = 1 << 5, // brief output
|
|
#endif
|
|
};
|
|
|
|
opt_complementary = "=0:t--d:d--t"; // no arguments; t ^ d
|
|
opts = getopt32(argv, "f:t:d:" IF_FEATURE_TUNCTL_UG("u:g:b"),
|
|
&opt_device, &opt_name, &opt_name
|
|
IF_FEATURE_TUNCTL_UG(, &opt_user, &opt_group));
|
|
|
|
// select device
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
|
|
strncpy_IFNAMSIZ(ifr.ifr_name, opt_name);
|
|
|
|
// open device
|
|
fd = xopen(opt_device, O_RDWR);
|
|
IOCTL(fd, TUNSETIFF, (void *)&ifr);
|
|
|
|
// delete?
|
|
if (opts & OPT_d) {
|
|
IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)0);
|
|
bb_info_msg("Set '%s' %spersistent", ifr.ifr_name, "non");
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
// create
|
|
#if ENABLE_FEATURE_TUNCTL_UG
|
|
if (opts & OPT_g) {
|
|
group = xgroup2gid(opt_group);
|
|
IOCTL(fd, TUNSETGROUP, (void *)(uintptr_t)group);
|
|
} else
|
|
user = geteuid();
|
|
if (opts & OPT_u)
|
|
user = xuname2uid(opt_user);
|
|
IOCTL(fd, TUNSETOWNER, (void *)(uintptr_t)user);
|
|
#endif
|
|
IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)1);
|
|
|
|
// show info
|
|
#if ENABLE_FEATURE_TUNCTL_UG
|
|
if (opts & OPT_b) {
|
|
puts(ifr.ifr_name);
|
|
} else {
|
|
printf("Set '%s' %spersistent", ifr.ifr_name, "");
|
|
printf(" and owned by uid %ld", user);
|
|
if (group != -1)
|
|
printf(" gid %ld", group);
|
|
bb_putchar('\n');
|
|
}
|
|
#else
|
|
puts(ifr.ifr_name);
|
|
#endif
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
#else
|
|
|
|
/* -210 bytes: */
|
|
|
|
int tunctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int tunctl_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
struct ifreq ifr;
|
|
int fd;
|
|
const char *opt_name = "tap%d";
|
|
const char *opt_device = "/dev/net/tun";
|
|
unsigned opts;
|
|
|
|
enum {
|
|
OPT_f = 1 << 0, // control device name (/dev/net/tun)
|
|
OPT_t = 1 << 1, // create named interface
|
|
OPT_d = 1 << 2, // delete named interface
|
|
};
|
|
|
|
opt_complementary = "=0:t--d:d--t"; // no arguments; t ^ d
|
|
opts = getopt32(argv, "f:t:d:u:g:b", // u, g, b accepted and ignored
|
|
&opt_device, &opt_name, &opt_name, NULL, NULL);
|
|
|
|
// set interface name
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
|
|
strncpy_IFNAMSIZ(ifr.ifr_name, opt_name);
|
|
|
|
// open device
|
|
fd = xopen(opt_device, O_RDWR);
|
|
IOCTL(fd, TUNSETIFF, (void *)&ifr);
|
|
|
|
// create or delete interface
|
|
IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)(0 == (opts & OPT_d)));
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
#endif
|