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