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    Annotation of /trunk/mkinitrd-magellan/busybox/networking/tunctl.c

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    Revision 984 - (hide annotations) (download)
    Sun May 30 11:32:42 2010 UTC (14 years 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 niro 984 /* 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