source: branches/3.2/mindi-busybox/networking/tunctl.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 6 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 3.9 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * tun devices controller
4 *
5 * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
6 *
7 * Original code:
8 *      Jeff Dike
9 *
10 * Licensed under GPLv2, see file LICENSE in this source tree.
11 */
12
13//usage:#define tunctl_trivial_usage
14//usage:       "[-f device] ([-t name] | -d name)" IF_FEATURE_TUNCTL_UG(" [-u owner] [-g group] [-b]")
15//usage:#define tunctl_full_usage "\n\n"
16//usage:       "Create or delete tun interfaces\n"
17//usage:     "\n    -f name     tun device (/dev/net/tun)"
18//usage:     "\n    -t name     Create iface 'name'"
19//usage:     "\n    -d name     Delete iface 'name'"
20//usage:    IF_FEATURE_TUNCTL_UG(
21//usage:     "\n    -u owner    Set iface owner"
22//usage:     "\n    -g group    Set iface group"
23//usage:     "\n    -b      Brief output"
24//usage:    )
25//usage:
26//usage:#define tunctl_example_usage
27//usage:       "# tunctl\n"
28//usage:       "# tunctl -d tun0\n"
29
30#include <netinet/in.h>
31#include <net/if.h>
32#include <linux/if_tun.h>
33#include "libbb.h"
34
35/* TUNSETGROUP appeared in 2.6.23 */
36#ifndef TUNSETGROUP
37#define TUNSETGROUP _IOW('T', 206, int)
38#endif
39
40#define IOCTL(a, b, c) ioctl_or_perror_and_die(a, b, c, NULL)
41
42#if 1
43
44int tunctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
45int tunctl_main(int argc UNUSED_PARAM, char **argv)
46{
47    struct ifreq ifr;
48    int fd;
49    const char *opt_name = "tap%d";
50    const char *opt_device = "/dev/net/tun";
51#if ENABLE_FEATURE_TUNCTL_UG
52    const char *opt_user, *opt_group;
53    long user = -1, group = -1;
54#endif
55    unsigned opts;
56
57    enum {
58        OPT_f = 1 << 0, // control device name (/dev/net/tun)
59        OPT_t = 1 << 1, // create named interface
60        OPT_d = 1 << 2, // delete named interface
61#if ENABLE_FEATURE_TUNCTL_UG
62        OPT_u = 1 << 3, // set new interface owner
63        OPT_g = 1 << 4, // set new interface group
64        OPT_b = 1 << 5, // brief output
65#endif
66    };
67
68    opt_complementary = "=0:t--d:d--t"; // no arguments; t ^ d
69    opts = getopt32(argv, "f:t:d:" IF_FEATURE_TUNCTL_UG("u:g:b"),
70            &opt_device, &opt_name, &opt_name
71            IF_FEATURE_TUNCTL_UG(, &opt_user, &opt_group));
72
73    // select device
74    memset(&ifr, 0, sizeof(ifr));
75    ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
76    strncpy_IFNAMSIZ(ifr.ifr_name, opt_name);
77
78    // open device
79    fd = xopen(opt_device, O_RDWR);
80    IOCTL(fd, TUNSETIFF, (void *)&ifr);
81
82    // delete?
83    if (opts & OPT_d) {
84        IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)0);
85        bb_info_msg("Set '%s' %spersistent", ifr.ifr_name, "non");
86        return EXIT_SUCCESS;
87    }
88
89    // create
90#if ENABLE_FEATURE_TUNCTL_UG
91    if (opts & OPT_g) {
92        group = xgroup2gid(opt_group);
93        IOCTL(fd, TUNSETGROUP, (void *)(uintptr_t)group);
94    } else
95        user = geteuid();
96    if (opts & OPT_u)
97        user = xuname2uid(opt_user);
98    IOCTL(fd, TUNSETOWNER, (void *)(uintptr_t)user);
99#endif
100    IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)1);
101
102    // show info
103#if ENABLE_FEATURE_TUNCTL_UG
104    if (opts & OPT_b) {
105        puts(ifr.ifr_name);
106    } else {
107        printf("Set '%s' %spersistent", ifr.ifr_name, "");
108        printf(" and owned by uid %ld", user);
109        if (group != -1)
110            printf(" gid %ld", group);
111        bb_putchar('\n');
112    }
113#else
114    puts(ifr.ifr_name);
115#endif
116    return EXIT_SUCCESS;
117}
118
119#else
120
121/* -210 bytes: */
122
123int tunctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
124int tunctl_main(int argc UNUSED_PARAM, char **argv)
125{
126    struct ifreq ifr;
127    int fd;
128    const char *opt_name = "tap%d";
129    const char *opt_device = "/dev/net/tun";
130    unsigned opts;
131
132    enum {
133        OPT_f = 1 << 0, // control device name (/dev/net/tun)
134        OPT_t = 1 << 1, // create named interface
135        OPT_d = 1 << 2, // delete named interface
136    };
137
138    opt_complementary = "=0:t--d:d--t"; // no arguments; t ^ d
139    opts = getopt32(argv, "f:t:d:u:g:b", // u, g, b accepted and ignored
140            &opt_device, &opt_name, &opt_name, NULL, NULL);
141
142    // set interface name
143    memset(&ifr, 0, sizeof(ifr));
144    ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
145    strncpy_IFNAMSIZ(ifr.ifr_name, opt_name);
146
147    // open device
148    fd = xopen(opt_device, O_RDWR);
149    IOCTL(fd, TUNSETIFF, (void *)&ifr);
150
151    // create or delete interface
152    IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)(0 == (opts & OPT_d)));
153
154    return EXIT_SUCCESS;
155}
156
157#endif
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