[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * tun devices controller
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| 4 | *
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| 5 | * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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| 6 | *
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| 7 | * Original code:
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| 8 | * Jeff Dike
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| 9 | *
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| 10 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 11 | */
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| 12 | #include <netinet/in.h>
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| 13 | #include <net/if.h>
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| 14 | #include <linux/if_tun.h>
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| 15 | #include "libbb.h"
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| 16 |
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| 17 | /* TUNSETGROUP appeared in 2.6.23 */
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| 18 | #ifndef TUNSETGROUP
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| 19 | #define TUNSETGROUP _IOW('T', 206, int)
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| 20 | #endif
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| 21 |
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| 22 | #define IOCTL(a, b, c) ioctl_or_perror_and_die(a, b, c, NULL)
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| 23 |
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| 24 | #if 1
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| 25 |
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| 26 | int tunctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 27 | int tunctl_main(int argc UNUSED_PARAM, char **argv)
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| 28 | {
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| 29 | struct ifreq ifr;
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| 30 | int fd;
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| 31 | const char *opt_name = "tap%d";
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| 32 | const char *opt_device = "/dev/net/tun";
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| 33 | #if ENABLE_FEATURE_TUNCTL_UG
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| 34 | const char *opt_user, *opt_group;
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| 35 | long user = -1, group = -1;
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| 36 | #endif
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| 37 | unsigned opts;
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| 38 |
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| 39 | enum {
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| 40 | OPT_f = 1 << 0, // control device name (/dev/net/tun)
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| 41 | OPT_t = 1 << 1, // create named interface
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| 42 | OPT_d = 1 << 2, // delete named interface
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| 43 | #if ENABLE_FEATURE_TUNCTL_UG
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| 44 | OPT_u = 1 << 3, // set new interface owner
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| 45 | OPT_g = 1 << 4, // set new interface group
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| 46 | OPT_b = 1 << 5, // brief output
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| 47 | #endif
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| 48 | };
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| 49 |
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| 50 | opt_complementary = "=0:t--d:d--t"; // no arguments; t ^ d
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| 51 | opts = getopt32(argv, "f:t:d:" IF_FEATURE_TUNCTL_UG("u:g:b"),
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| 52 | &opt_device, &opt_name, &opt_name
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| 53 | IF_FEATURE_TUNCTL_UG(, &opt_user, &opt_group));
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| 54 |
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| 55 | // select device
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| 56 | memset(&ifr, 0, sizeof(ifr));
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| 57 | ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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| 58 | strncpy_IFNAMSIZ(ifr.ifr_name, opt_name);
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| 59 |
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| 60 | // open device
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| 61 | fd = xopen(opt_device, O_RDWR);
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| 62 | IOCTL(fd, TUNSETIFF, (void *)&ifr);
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| 63 |
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| 64 | // delete?
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| 65 | if (opts & OPT_d) {
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| 66 | IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)0);
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| 67 | bb_info_msg("Set '%s' %spersistent", ifr.ifr_name, "non");
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| 68 | return EXIT_SUCCESS;
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| 69 | }
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| 70 |
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| 71 | // create
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| 72 | #if ENABLE_FEATURE_TUNCTL_UG
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| 73 | if (opts & OPT_g) {
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| 74 | group = xgroup2gid(opt_group);
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| 75 | IOCTL(fd, TUNSETGROUP, (void *)(uintptr_t)group);
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| 76 | } else
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| 77 | user = geteuid();
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| 78 | if (opts & OPT_u)
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| 79 | user = xuname2uid(opt_user);
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| 80 | IOCTL(fd, TUNSETOWNER, (void *)(uintptr_t)user);
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| 81 | #endif
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| 82 | IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)1);
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| 83 |
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| 84 | // show info
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| 85 | #if ENABLE_FEATURE_TUNCTL_UG
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| 86 | if (opts & OPT_b) {
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| 87 | puts(ifr.ifr_name);
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| 88 | } else {
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| 89 | printf("Set '%s' %spersistent", ifr.ifr_name, "");
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| 90 | printf(" and owned by uid %ld", user);
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| 91 | if (group != -1)
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| 92 | printf(" gid %ld", group);
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| 93 | bb_putchar('\n');
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| 94 | }
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| 95 | #else
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| 96 | puts(ifr.ifr_name);
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| 97 | #endif
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| 98 | return EXIT_SUCCESS;
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| 99 | }
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| 100 |
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| 101 | #else
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| 102 |
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| 103 | /* -210 bytes: */
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| 104 |
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| 105 | int tunctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 106 | int tunctl_main(int argc UNUSED_PARAM, char **argv)
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| 107 | {
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| 108 | struct ifreq ifr;
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| 109 | int fd;
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| 110 | const char *opt_name = "tap%d";
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| 111 | const char *opt_device = "/dev/net/tun";
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| 112 | unsigned opts;
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| 113 |
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| 114 | enum {
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| 115 | OPT_f = 1 << 0, // control device name (/dev/net/tun)
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| 116 | OPT_t = 1 << 1, // create named interface
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| 117 | OPT_d = 1 << 2, // delete named interface
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| 118 | };
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| 119 |
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| 120 | opt_complementary = "=0:t--d:d--t"; // no arguments; t ^ d
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| 121 | opts = getopt32(argv, "f:t:d:u:g:b", // u, g, b accepted and ignored
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| 122 | &opt_device, &opt_name, &opt_name, NULL, NULL);
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| 123 |
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| 124 | // set interface name
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| 125 | memset(&ifr, 0, sizeof(ifr));
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| 126 | ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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| 127 | strncpy_IFNAMSIZ(ifr.ifr_name, opt_name);
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| 128 |
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| 129 | // open device
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| 130 | fd = xopen(opt_device, O_RDWR);
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| 131 | IOCTL(fd, TUNSETIFF, (void *)&ifr);
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| 132 |
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| 133 | // create or delete interface
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| 134 | IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)(0 == (opts & OPT_d)));
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| 135 |
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| 136 | return EXIT_SUCCESS;
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| 137 | }
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| 138 |
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| 139 | #endif
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