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    Contents of /trunk/mkinitrd-magellan/busybox/coreutils/id.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 2656 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Mini id implementation for busybox
    4 *
    5 * Copyright (C) 2000 by Randolph Chung <tausq@debian.org>
    6 *
    7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    8 */
    9
    10 /* BB_AUDIT SUSv3 _NOT_ compliant -- option -G is not currently supported. */
    11 /* Hacked by Tito Ragusa (C) 2004 to handle usernames of whatever length and to
    12 * be more similar to GNU id.
    13 */
    14
    15 #include "busybox.h"
    16 #include <stdio.h>
    17 #include <unistd.h>
    18 #include <sys/types.h>
    19
    20 #ifdef CONFIG_SELINUX
    21 #include <selinux/selinux.h> /* for is_selinux_enabled() */
    22 #endif
    23
    24 #define PRINT_REAL 1
    25 #define NAME_NOT_NUMBER 2
    26 #define JUST_USER 4
    27 #define JUST_GROUP 8
    28
    29 static short printf_full(unsigned int id, const char *arg, const char prefix)
    30 {
    31 const char *fmt = "%cid=%u";
    32 short status = EXIT_FAILURE;
    33
    34 if (arg) {
    35 fmt = "%cid=%u(%s)";
    36 status = EXIT_SUCCESS;
    37 }
    38 printf(fmt, prefix, id, arg);
    39 return status;
    40 }
    41
    42 int id_main(int argc, char **argv)
    43 {
    44 struct passwd *p;
    45 uid_t uid;
    46 gid_t gid;
    47 unsigned long flags;
    48 short status;
    49
    50 /* Don't allow -n -r -nr -ug -rug -nug -rnug */
    51 /* Don't allow more than one username */
    52 opt_complementary = "?1:?:u--g:g--u:r?ug:n?ug";
    53 flags = getopt32(argc, argv, "rnug");
    54
    55 /* This values could be overwritten later */
    56 uid = geteuid();
    57 gid = getegid();
    58 if (flags & PRINT_REAL) {
    59 uid = getuid();
    60 gid = getgid();
    61 }
    62
    63 if (argv[optind]) {
    64 p = getpwnam(argv[optind]);
    65 /* xuname2uid is needed because it exits on failure */
    66 uid = xuname2uid(argv[optind]);
    67 gid = p->pw_gid;
    68 /* in this case PRINT_REAL is the same */
    69 }
    70
    71 if (flags & (JUST_GROUP | JUST_USER)) {
    72 /* JUST_GROUP and JUST_USER are mutually exclusive */
    73 if (flags & NAME_NOT_NUMBER) {
    74 /* bb_getpwuid and bb_getgrgid exit on failure so puts cannot segfault */
    75 puts((flags & JUST_USER) ? bb_getpwuid(NULL, uid, -1 ) : bb_getgrgid(NULL, gid, -1 ));
    76 } else {
    77 printf("%u\n", (flags & JUST_USER) ? uid : gid);
    78 }
    79 /* exit */
    80 fflush_stdout_and_exit(EXIT_SUCCESS);
    81 }
    82
    83 /* Print full info like GNU id */
    84 /* bb_getpwuid doesn't exit on failure here */
    85 status = printf_full(uid, bb_getpwuid(NULL, uid, 0), 'u');
    86 putchar(' ');
    87 /* bb_getgrgid doesn't exit on failure here */
    88 status |= printf_full(gid, bb_getgrgid(NULL, gid, 0), 'g');
    89
    90 #ifdef CONFIG_SELINUX
    91 if (is_selinux_enabled()) {
    92 security_context_t mysid;
    93 const char *context;
    94
    95 context = "unknown";
    96 getcon(&mysid);
    97 if (mysid) {
    98 context = alloca(strlen(mysid) + 1);
    99 strcpy((char*)context, mysid);
    100 freecon(mysid);
    101 }
    102 printf(" context=%s", context);
    103 }
    104 #endif
    105
    106 putchar('\n');
    107 fflush_stdout_and_exit(status);
    108 }