Contents of /trunk/mkinitrd-magellan/busybox/networking/tunctl.c
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 3372 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
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 tarball for details. |
11 | */ |
12 | #include <netinet/in.h> |
13 | #include <net/if.h> |
14 | #include <linux/if_tun.h> |
15 | #include "libbb.h" |
16 | |
17 | /* TUNSETGROUP appeared in 2.6.23 */ |
18 | #ifndef TUNSETGROUP |
19 | #define TUNSETGROUP _IOW('T', 206, int) |
20 | #endif |
21 | |
22 | #define IOCTL(a, b, c) ioctl_or_perror_and_die(a, b, c, NULL) |
23 | |
24 | #if 1 |
25 | |
26 | int tunctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
27 | int tunctl_main(int argc UNUSED_PARAM, char **argv) |
28 | { |
29 | struct ifreq ifr; |
30 | int fd; |
31 | const char *opt_name = "tap%d"; |
32 | const char *opt_device = "/dev/net/tun"; |
33 | #if ENABLE_FEATURE_TUNCTL_UG |
34 | const char *opt_user, *opt_group; |
35 | long user = -1, group = -1; |
36 | #endif |
37 | unsigned opts; |
38 | |
39 | enum { |
40 | OPT_f = 1 << 0, // control device name (/dev/net/tun) |
41 | OPT_t = 1 << 1, // create named interface |
42 | OPT_d = 1 << 2, // delete named interface |
43 | #if ENABLE_FEATURE_TUNCTL_UG |
44 | OPT_u = 1 << 3, // set new interface owner |
45 | OPT_g = 1 << 4, // set new interface group |
46 | OPT_b = 1 << 5, // brief output |
47 | #endif |
48 | }; |
49 | |
50 | opt_complementary = "=0:t--d:d--t"; // no arguments; t ^ d |
51 | opts = getopt32(argv, "f:t:d:" IF_FEATURE_TUNCTL_UG("u:g:b"), |
52 | &opt_device, &opt_name, &opt_name |
53 | IF_FEATURE_TUNCTL_UG(, &opt_user, &opt_group)); |
54 | |
55 | // select device |
56 | memset(&ifr, 0, sizeof(ifr)); |
57 | ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
58 | strncpy_IFNAMSIZ(ifr.ifr_name, opt_name); |
59 | |
60 | // open device |
61 | fd = xopen(opt_device, O_RDWR); |
62 | IOCTL(fd, TUNSETIFF, (void *)&ifr); |
63 | |
64 | // delete? |
65 | if (opts & OPT_d) { |
66 | IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)0); |
67 | bb_info_msg("Set '%s' %spersistent", ifr.ifr_name, "non"); |
68 | return EXIT_SUCCESS; |
69 | } |
70 | |
71 | // create |
72 | #if ENABLE_FEATURE_TUNCTL_UG |
73 | if (opts & OPT_g) { |
74 | group = xgroup2gid(opt_group); |
75 | IOCTL(fd, TUNSETGROUP, (void *)(uintptr_t)group); |
76 | } else |
77 | user = geteuid(); |
78 | if (opts & OPT_u) |
79 | user = xuname2uid(opt_user); |
80 | IOCTL(fd, TUNSETOWNER, (void *)(uintptr_t)user); |
81 | #endif |
82 | IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)1); |
83 | |
84 | // show info |
85 | #if ENABLE_FEATURE_TUNCTL_UG |
86 | if (opts & OPT_b) { |
87 | puts(ifr.ifr_name); |
88 | } else { |
89 | printf("Set '%s' %spersistent", ifr.ifr_name, ""); |
90 | printf(" and owned by uid %ld", user); |
91 | if (group != -1) |
92 | printf(" gid %ld", group); |
93 | bb_putchar('\n'); |
94 | } |
95 | #else |
96 | puts(ifr.ifr_name); |
97 | #endif |
98 | return EXIT_SUCCESS; |
99 | } |
100 | |
101 | #else |
102 | |
103 | /* -210 bytes: */ |
104 | |
105 | int tunctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
106 | int tunctl_main(int argc UNUSED_PARAM, char **argv) |
107 | { |
108 | struct ifreq ifr; |
109 | int fd; |
110 | const char *opt_name = "tap%d"; |
111 | const char *opt_device = "/dev/net/tun"; |
112 | unsigned opts; |
113 | |
114 | enum { |
115 | OPT_f = 1 << 0, // control device name (/dev/net/tun) |
116 | OPT_t = 1 << 1, // create named interface |
117 | OPT_d = 1 << 2, // delete named interface |
118 | }; |
119 | |
120 | opt_complementary = "=0:t--d:d--t"; // no arguments; t ^ d |
121 | opts = getopt32(argv, "f:t:d:u:g:b", // u, g, b accepted and ignored |
122 | &opt_device, &opt_name, &opt_name, NULL, NULL); |
123 | |
124 | // set interface name |
125 | memset(&ifr, 0, sizeof(ifr)); |
126 | ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
127 | strncpy_IFNAMSIZ(ifr.ifr_name, opt_name); |
128 | |
129 | // open device |
130 | fd = xopen(opt_device, O_RDWR); |
131 | IOCTL(fd, TUNSETIFF, (void *)&ifr); |
132 | |
133 | // create or delete interface |
134 | IOCTL(fd, TUNSETPERSIST, (void *)(uintptr_t)(0 == (opts & OPT_d))); |
135 | |
136 | return EXIT_SUCCESS; |
137 | } |
138 | |
139 | #endif |