Magellan Linux

  • Back to homepage
    • /[magellan-source]/trunk/mkinitrd-magellan/busybox/loginutils/addgroup.c

    Contents of /trunk/mkinitrd-magellan/busybox/loginutils/addgroup.c

    Parent Directory Parent Directory | Revision Log Revision Log

    Revision 816 - (show annotations) (download)
    Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
    File MIME type: text/plain
    File size: 4403 byte(s) 
    -updated to busybox-1.13.4
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * addgroup - add groups to /etc/group and /etc/gshadow
    4 *
    5 * Copyright (C) 1999 by Lineo, inc. and John Beppu
    6 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
    7 * Copyright (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
    8 *
    9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    10 *
    11 */
    12
    13 #include "libbb.h"
    14
    15 static void xgroup_study(struct group *g)
    16 {
    17 /* Make sure gr_name is unused */
    18 if (getgrnam(g->gr_name)) {
    19 goto error;
    20 }
    21
    22 /* Check if the desired gid is free
    23 * or find the first free one */
    24 while (1) {
    25 if (!getgrgid(g->gr_gid)) {
    26 return; /* found free group: return */
    27 }
    28 if (option_mask32) {
    29 /* -g N, cannot pick gid other than N: error */
    30 g->gr_name = itoa(g->gr_gid);
    31 goto error;
    32 }
    33 g->gr_gid++;
    34 if (g->gr_gid <= 0) {
    35 /* overflowed: error */
    36 bb_error_msg_and_die("no gids left");
    37 }
    38 }
    39
    40 error:
    41 /* exit */
    42 bb_error_msg_and_die("group %s already exists", g->gr_name);
    43 }
    44
    45 /* append a new user to the passwd file */
    46 static void new_group(char *group, gid_t gid)
    47 {
    48 FILE *file;
    49 struct group gr;
    50
    51 /* make sure gid and group haven't already been allocated */
    52 gr.gr_gid = gid;
    53 gr.gr_name = group;
    54 xgroup_study(&gr);
    55
    56 /* add entry to group */
    57 file = xfopen(bb_path_group_file, "a");
    58 /* group:passwd:gid:userlist */
    59 fprintf(file, "%s:x:%u:\n", group, (unsigned)gr.gr_gid);
    60 if (ENABLE_FEATURE_CLEAN_UP)
    61 fclose(file);
    62 #if ENABLE_FEATURE_SHADOWPASSWDS
    63 file = fopen_or_warn(bb_path_gshadow_file, "a");
    64 if (file) {
    65 fprintf(file, "%s:!::\n", group);
    66 if (ENABLE_FEATURE_CLEAN_UP)
    67 fclose(file);
    68 }
    69 #endif
    70 }
    71
    72 #if ENABLE_FEATURE_ADDUSER_TO_GROUP
    73 static void add_user_to_group(char **args,
    74 const char *path,
    75 FILE* FAST_FUNC (*fopen_func)(const char *fileName, const char *mode))
    76 {
    77 char *line;
    78 int len = strlen(args[1]);
    79 llist_t *plist = NULL;
    80 FILE *group_file;
    81
    82 group_file = fopen_func(path, "r");
    83
    84 if (!group_file) return;
    85
    86 while ((line = xmalloc_fgetline(group_file)) != NULL) {
    87 /* Find the group */
    88 if (!strncmp(line, args[1], len)
    89 && line[len] == ':'
    90 ) {
    91 /* Add the new user */
    92 line = xasprintf("%s%s%s", line,
    93 last_char_is(line, ':') ? "" : ",",
    94 args[0]);
    95 }
    96 llist_add_to_end(&plist, line);
    97 }
    98
    99 if (ENABLE_FEATURE_CLEAN_UP) {
    100 fclose(group_file);
    101 group_file = fopen_func(path, "w");
    102 while ((line = llist_pop(&plist))) {
    103 if (group_file)
    104 fprintf(group_file, "%s\n", line);
    105 free(line);
    106 }
    107 if (group_file)
    108 fclose(group_file);
    109 } else {
    110 group_file = fopen_func(path, "w");
    111 if (group_file)
    112 while ((line = llist_pop(&plist)))
    113 fprintf(group_file, "%s\n", line);
    114 }
    115 }
    116 #endif
    117
    118 /*
    119 * addgroup will take a login_name as its first parameter.
    120 *
    121 * gid can be customized via command-line parameters.
    122 * If called with two non-option arguments, addgroup
    123 * will add an existing user to an existing group.
    124 */
    125 int addgroup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    126 int addgroup_main(int argc UNUSED_PARAM, char **argv)
    127 {
    128 char *group;
    129 gid_t gid = 0;
    130
    131 /* need to be root */
    132 if (geteuid()) {
    133 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
    134 }
    135
    136 /* Syntax:
    137 * addgroup group
    138 * addgroup -g num group
    139 * addgroup user group
    140 * Check for min, max and missing args */
    141 opt_complementary = "-1:?2";
    142 if (getopt32(argv, "g:", &group)) {
    143 gid = xatoul_range(group, 0, ((unsigned long)(gid_t)ULONG_MAX) >> 1);
    144 }
    145 /* move past the commandline options */
    146 argv += optind;
    147 //argc -= optind;
    148
    149 #if ENABLE_FEATURE_ADDUSER_TO_GROUP
    150 if (argv[1]) {
    151 struct group *gr;
    152
    153 if (option_mask32) {
    154 /* -g was there, but "addgroup -g num user group"
    155 * is a no-no */
    156 bb_show_usage();
    157 }
    158
    159 /* check if group and user exist */
    160 xuname2uid(argv[0]); /* unknown user: exit */
    161 xgroup2gid(argv[1]); /* unknown group: exit */
    162 /* check if user is already in this group */
    163 gr = getgrnam(argv[1]);
    164 for (; *(gr->gr_mem) != NULL; (gr->gr_mem)++) {
    165 if (!strcmp(argv[0], *(gr->gr_mem))) {
    166 /* user is already in group: do nothing */
    167 return EXIT_SUCCESS;
    168 }
    169 }
    170 add_user_to_group(argv, bb_path_group_file, xfopen);
    171 #if ENABLE_FEATURE_SHADOWPASSWDS
    172 add_user_to_group(argv, bb_path_gshadow_file, fopen_or_warn);
    173 #endif
    174 } else
    175 #endif /* ENABLE_FEATURE_ADDUSER_TO_GROUP */
    176 {
    177 die_if_bad_username(argv[0]);
    178 new_group(argv[0], gid);
    179
    180 }
    181 /* Reached only on success */
    182 return EXIT_SUCCESS;
    183 }