mirror of
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0ef64bdb40
This change retains "or later" state! No licensing _changes_ here, only form is adjusted (article, space between "GPL" and "v2" and so on). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* tun devices controller
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*
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* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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*
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* Original code:
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* Jeff Dike
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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#include <netinet/in.h>
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#include <net/if.h>
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#include <linux/if_tun.h>
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#include "libbb.h"
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/* TUNSETGROUP appeared in 2.6.23 */
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#ifndef TUNSETGROUP
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#define TUNSETGROUP _IOW('T', 206, int)
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#endif
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#define IOCTL(a, b, c) ioctl_or_perror_and_die(a, b, c, NULL)
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#if 1
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int tunctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int tunctl_main(int argc UNUSED_PARAM, char **argv)
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{
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struct ifreq ifr;
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int fd;
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const char *opt_name = "tap%d";
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const char *opt_device = "/dev/net/tun";
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#if ENABLE_FEATURE_TUNCTL_UG
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const char *opt_user, *opt_group;
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long user = -1, group = -1;
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#endif
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unsigned opts;
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enum {
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OPT_f = 1 << 0, // control device name (/dev/net/tun)
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OPT_t = 1 << 1, // create named interface
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OPT_d = 1 << 2, // delete named interface
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#if ENABLE_FEATURE_TUNCTL_UG
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OPT_u = 1 << 3, // set new interface owner
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OPT_g = 1 << 4, // set new interface group
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OPT_b = 1 << 5, // brief output
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#endif
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};
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opt_complementary = "=0:t--d:d--t"; // no arguments; t ^ d
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opts = getopt32(argv, "f:t:d:" IF_FEATURE_TUNCTL_UG("u:g:b"),
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&opt_device, &opt_name, &opt_name
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IF_FEATURE_TUNCTL_UG(, &opt_user, &opt_group));
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// select device
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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strncpy_IFNAMSIZ(ifr.ifr_name, opt_name);
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// open device
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fd = xopen(opt_device, O_RDWR);
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IOCTL(fd, TUNSETIFF, (void *)&ifr);
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// delete?
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if (opts & OPT_d) {
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IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)0);
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bb_info_msg("Set '%s' %spersistent", ifr.ifr_name, "non");
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return EXIT_SUCCESS;
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}
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// create
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#if ENABLE_FEATURE_TUNCTL_UG
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if (opts & OPT_g) {
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group = xgroup2gid(opt_group);
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IOCTL(fd, TUNSETGROUP, (void *)(uintptr_t)group);
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} else
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user = geteuid();
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if (opts & OPT_u)
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user = xuname2uid(opt_user);
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IOCTL(fd, TUNSETOWNER, (void *)(uintptr_t)user);
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#endif
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IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)1);
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// show info
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#if ENABLE_FEATURE_TUNCTL_UG
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if (opts & OPT_b) {
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puts(ifr.ifr_name);
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} else {
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printf("Set '%s' %spersistent", ifr.ifr_name, "");
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printf(" and owned by uid %ld", user);
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if (group != -1)
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printf(" gid %ld", group);
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bb_putchar('\n');
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}
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#else
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puts(ifr.ifr_name);
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#endif
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return EXIT_SUCCESS;
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}
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#else
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/* -210 bytes: */
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int tunctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int tunctl_main(int argc UNUSED_PARAM, char **argv)
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{
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struct ifreq ifr;
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int fd;
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const char *opt_name = "tap%d";
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const char *opt_device = "/dev/net/tun";
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unsigned opts;
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enum {
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OPT_f = 1 << 0, // control device name (/dev/net/tun)
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OPT_t = 1 << 1, // create named interface
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OPT_d = 1 << 2, // delete named interface
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};
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opt_complementary = "=0:t--d:d--t"; // no arguments; t ^ d
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opts = getopt32(argv, "f:t:d:u:g:b", // u, g, b accepted and ignored
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&opt_device, &opt_name, &opt_name, NULL, NULL);
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// set interface name
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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strncpy_IFNAMSIZ(ifr.ifr_name, opt_name);
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// open device
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fd = xopen(opt_device, O_RDWR);
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IOCTL(fd, TUNSETIFF, (void *)&ifr);
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// create or delete interface
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IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)(0 == (opts & OPT_d)));
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return EXIT_SUCCESS;
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}
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#endif
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