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

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 5736 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 * Mini id implementation for busybox
    4 *
    5 * Copyright (C) 2000 by Randolph Chung <tausq@debian.org>
    6 * Copyright (C) 2008 by Tito Ragusa <farmatito@tiscali.it>
    7 *
    8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    9 */
    10
    11 /* BB_AUDIT SUSv3 compliant. */
    12 /* Hacked by Tito Ragusa (C) 2004 to handle usernames of whatever
    13 * length and to be more similar to GNU id.
    14 * -Z option support: by Yuichi Nakamura <ynakam@hitachisoft.jp>
    15 * Added -G option Tito Ragusa (C) 2008 for SUSv3.
    16 */
    17
    18 #include "libbb.h"
    19
    20 #if !ENABLE_USE_BB_PWD_GRP
    21 #if defined(__UCLIBC_MAJOR__) && (__UCLIBC_MAJOR__ == 0)
    22 #if (__UCLIBC_MINOR__ < 9) || (__UCLIBC_MINOR__ == 9 && __UCLIBC_SUBLEVEL__ < 30)
    23 #error "Sorry, you need at least uClibc version 0.9.30 for id applet to build"
    24 #endif
    25 #endif
    26 #endif
    27
    28 enum {
    29 PRINT_REAL = (1 << 0),
    30 NAME_NOT_NUMBER = (1 << 1),
    31 JUST_USER = (1 << 2),
    32 JUST_GROUP = (1 << 3),
    33 JUST_ALL_GROUPS = (1 << 4),
    34 #if ENABLE_SELINUX
    35 JUST_CONTEXT = (1 << 5),
    36 #endif
    37 };
    38
    39 static int print_common(unsigned id, const char *name, const char *prefix)
    40 {
    41 if (prefix) {
    42 printf("%s", prefix);
    43 }
    44 if (!(option_mask32 & NAME_NOT_NUMBER) || !name) {
    45 printf("%u", id);
    46 }
    47 if (!option_mask32 || (option_mask32 & NAME_NOT_NUMBER)) {
    48 if (name) {
    49 printf(option_mask32 ? "%s" : "(%s)", name);
    50 } else {
    51 /* Don't set error status flag in default mode */
    52 if (option_mask32) {
    53 if (ENABLE_DESKTOP)
    54 bb_error_msg("unknown ID %u", id);
    55 return EXIT_FAILURE;
    56 }
    57 }
    58 }
    59 return EXIT_SUCCESS;
    60 }
    61
    62 static int print_group(gid_t id, const char *prefix)
    63 {
    64 return print_common(id, gid2group(id), prefix);
    65 }
    66
    67 static int print_user(uid_t id, const char *prefix)
    68 {
    69 return print_common(id, uid2uname(id), prefix);
    70 }
    71
    72 /* On error set *n < 0 and return >= 0
    73 * If *n is too small, update it and return < 0
    74 * (ok to trash groups[] in both cases)
    75 * Otherwise fill in groups[] and return >= 0
    76 */
    77 static int get_groups(const char *username, gid_t rgid, gid_t *groups, int *n)
    78 {
    79 int m;
    80
    81 if (username) {
    82 /* If the user is a member of more than
    83 * *n groups, then -1 is returned. Otherwise >= 0.
    84 * (and no defined way of detecting errors?!) */
    85 m = getgrouplist(username, rgid, groups, n);
    86 /* I guess *n < 0 might indicate error. Anyway,
    87 * malloc'ing -1 bytes won't be good, so: */
    88 //if (*n < 0)
    89 // return 0;
    90 //return m;
    91 //commented out here, happens below anyway
    92 } else {
    93 /* On error -1 is returned, which ends up in *n */
    94 int nn = getgroups(*n, groups);
    95 /* 0: nn <= *n, groups[] was big enough; -1 otherwise */
    96 m = - (nn > *n);
    97 *n = nn;
    98 }
    99 if (*n < 0)
    100 return 0; /* error, don't return < 0! */
    101 return m;
    102 }
    103
    104 int id_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    105 int id_main(int argc UNUSED_PARAM, char **argv)
    106 {
    107 uid_t ruid;
    108 gid_t rgid;
    109 uid_t euid;
    110 gid_t egid;
    111 unsigned opt;
    112 int i;
    113 int status = EXIT_SUCCESS;
    114 const char *prefix;
    115 const char *username;
    116 #if ENABLE_SELINUX
    117 security_context_t scontext = NULL;
    118 #endif
    119 /* Don't allow -n -r -nr -ug -rug -nug -rnug -uZ -gZ -GZ*/
    120 /* Don't allow more than one username */
    121 opt_complementary = "?1:u--g:g--u:G--u:u--G:g--G:G--g:r?ugG:n?ugG"
    122 IF_SELINUX(":u--Z:Z--u:g--Z:Z--g:G--Z:Z--G");
    123 opt = getopt32(argv, "rnugG" IF_SELINUX("Z"));
    124
    125 username = argv[optind];
    126 if (username) {
    127 struct passwd *p = xgetpwnam(username);
    128 euid = ruid = p->pw_uid;
    129 egid = rgid = p->pw_gid;
    130 } else {
    131 egid = getegid();
    132 rgid = getgid();
    133 euid = geteuid();
    134 ruid = getuid();
    135 }
    136 /* JUST_ALL_GROUPS ignores -r PRINT_REAL flag even if man page for */
    137 /* id says: print the real ID instead of the effective ID, with -ugG */
    138 /* in fact in this case egid is always printed if egid != rgid */
    139 if (!opt || (opt & JUST_ALL_GROUPS)) {
    140 gid_t *groups;
    141 int n;
    142
    143 if (!opt) {
    144 /* Default Mode */
    145 status |= print_user(ruid, "uid=");
    146 status |= print_group(rgid, " gid=");
    147 if (euid != ruid)
    148 status |= print_user(euid, " euid=");
    149 if (egid != rgid)
    150 status |= print_group(egid, " egid=");
    151 } else {
    152 /* JUST_ALL_GROUPS */
    153 status |= print_group(rgid, NULL);
    154 if (egid != rgid)
    155 status |= print_group(egid, " ");
    156 }
    157 /* We are supplying largish buffer, trying
    158 * to not run get_groups() twice. That might be slow
    159 * ("user database in remote SQL server" case) */
    160 groups = xmalloc(64 * sizeof(gid_t));
    161 n = 64;
    162 if (get_groups(username, rgid, groups, &n) < 0) {
    163 /* Need bigger buffer after all */
    164 groups = xrealloc(groups, n * sizeof(gid_t));
    165 get_groups(username, rgid, groups, &n);
    166 }
    167 if (n > 0) {
    168 /* Print the list */
    169 prefix = " groups=";
    170 for (i = 0; i < n; i++) {
    171 if (opt && (groups[i] == rgid || groups[i] == egid))
    172 continue;
    173 status |= print_group(groups[i], opt ? " " : prefix);
    174 prefix = ",";
    175 }
    176 } else if (n < 0) { /* error in get_groups() */
    177 if (!ENABLE_DESKTOP)
    178 bb_error_msg_and_die("can't get groups");
    179 else
    180 return EXIT_FAILURE;
    181 }
    182 if (ENABLE_FEATURE_CLEAN_UP)
    183 free(groups);
    184 #if ENABLE_SELINUX
    185 if (is_selinux_enabled()) {
    186 if (getcon(&scontext) == 0)
    187 printf(" context=%s", scontext);
    188 }
    189 #endif
    190 } else if (opt & PRINT_REAL) {
    191 euid = ruid;
    192 egid = rgid;
    193 }
    194
    195 if (opt & JUST_USER)
    196 status |= print_user(euid, NULL);
    197 else if (opt & JUST_GROUP)
    198 status |= print_group(egid, NULL);
    199 #if ENABLE_SELINUX
    200 else if (opt & JUST_CONTEXT) {
    201 selinux_or_die();
    202 if (username || getcon(&scontext)) {
    203 bb_error_msg_and_die("can't get process context%s",
    204 username ? " for a different user" : "");
    205 }
    206 fputs(scontext, stdout);
    207 }
    208 /* freecon(NULL) seems to be harmless */
    209 if (ENABLE_FEATURE_CLEAN_UP)
    210 freecon(scontext);
    211 #endif
    212 bb_putchar('\n');
    213 fflush_stdout_and_exit(status);
    214 }