1 /* vi: set sw=4 ts=4: */
3 * tun devices controller
5 * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
10 * Licensed under GPLv2, see file LICENSE in this source tree.
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"
18 //usage: "\n -f name tun device (/dev/net/tun)"
19 //usage: "\n -t name Create iface 'name'"
20 //usage: "\n -d name Delete iface 'name'"
21 //usage: IF_FEATURE_TUNCTL_UG(
22 //usage: "\n -u owner Set iface owner"
23 //usage: "\n -g group Set iface group"
24 //usage: "\n -b Brief output"
27 //usage:#define tunctl_example_usage
29 //usage: "# tunctl -d tun0\n"
31 #include <netinet/in.h>
33 #include <linux/if_tun.h>
36 /* TUNSETGROUP appeared in 2.6.23 */
38 #define TUNSETGROUP _IOW('T', 206, int)
41 #define IOCTL(a, b, c) ioctl_or_perror_and_die(a, b, c, NULL)
45 int tunctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
46 int tunctl_main(int argc UNUSED_PARAM, char **argv)
50 const char *opt_name = "tap%d";
51 const char *opt_device = "/dev/net/tun";
52 #if ENABLE_FEATURE_TUNCTL_UG
53 const char *opt_user, *opt_group;
54 long user = -1, group = -1;
59 OPT_f = 1 << 0, // control device name (/dev/net/tun)
60 OPT_t = 1 << 1, // create named interface
61 OPT_d = 1 << 2, // delete named interface
62 #if ENABLE_FEATURE_TUNCTL_UG
63 OPT_u = 1 << 3, // set new interface owner
64 OPT_g = 1 << 4, // set new interface group
65 OPT_b = 1 << 5, // brief output
69 opt_complementary = "=0:t--d:d--t"; // no arguments; t ^ d
70 opts = getopt32(argv, "f:t:d:" IF_FEATURE_TUNCTL_UG("u:g:b"),
71 &opt_device, &opt_name, &opt_name
72 IF_FEATURE_TUNCTL_UG(, &opt_user, &opt_group));
75 memset(&ifr, 0, sizeof(ifr));
76 ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
77 strncpy_IFNAMSIZ(ifr.ifr_name, opt_name);
80 fd = xopen(opt_device, O_RDWR);
81 IOCTL(fd, TUNSETIFF, (void *)&ifr);
85 IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)0);
86 bb_info_msg("Set '%s' %spersistent", ifr.ifr_name, "non");
91 #if ENABLE_FEATURE_TUNCTL_UG
93 group = xgroup2gid(opt_group);
94 IOCTL(fd, TUNSETGROUP, (void *)(uintptr_t)group);
98 user = xuname2uid(opt_user);
99 IOCTL(fd, TUNSETOWNER, (void *)(uintptr_t)user);
101 IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)1);
104 #if ENABLE_FEATURE_TUNCTL_UG
108 printf("Set '%s' %spersistent", ifr.ifr_name, "");
109 printf(" and owned by uid %ld", user);
111 printf(" gid %ld", group);
124 int tunctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
125 int tunctl_main(int argc UNUSED_PARAM, char **argv)
129 const char *opt_name = "tap%d";
130 const char *opt_device = "/dev/net/tun";
134 OPT_f = 1 << 0, // control device name (/dev/net/tun)
135 OPT_t = 1 << 1, // create named interface
136 OPT_d = 1 << 2, // delete named interface
139 opt_complementary = "=0:t--d:d--t"; // no arguments; t ^ d
140 opts = getopt32(argv, "f:t:d:u:g:b", // u, g, b accepted and ignored
141 &opt_device, &opt_name, &opt_name, NULL, NULL);
143 // set interface name
144 memset(&ifr, 0, sizeof(ifr));
145 ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
146 strncpy_IFNAMSIZ(ifr.ifr_name, opt_name);
149 fd = xopen(opt_device, O_RDWR);
150 IOCTL(fd, TUNSETIFF, (void *)&ifr);
152 // create or delete interface
153 IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)(0 == (opts & OPT_d)));