1 /* vi: set sw=4 ts=4: */
3 * addgroup - add groups to /etc/group and /etc/gshadow
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>
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
15 static void xgroup_study(struct group *g)
17 /* Make sure gr_name is unused */
18 if (getgrnam(g->gr_name)) {
22 /* Check if the desired gid is free
23 * or find the first free one */
25 if (!getgrgid(g->gr_gid)) {
26 return; /* found free group: return */
29 /* -g N, cannot pick gid other than N: error */
30 g->gr_name = itoa(g->gr_gid);
35 /* overflowed: error */
36 bb_error_msg_and_die("no gids left");
42 bb_error_msg_and_die("group %s already exists", g->gr_name);
45 /* append a new user to the passwd file */
46 static void new_group(char *group, gid_t gid)
51 /* make sure gid and group haven't already been allocated */
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)
62 #if ENABLE_FEATURE_SHADOWPASSWDS
63 file = fopen_or_warn(bb_path_gshadow_file, "a");
65 fprintf(file, "%s:!::\n", group);
66 if (ENABLE_FEATURE_CLEAN_UP)
72 #if ENABLE_FEATURE_ADDUSER_TO_GROUP
73 static void add_user_to_group(char **args,
75 FILE* FAST_FUNC (*fopen_func)(const char *fileName, const char *mode))
78 int len = strlen(args[1]);
79 llist_t *plist = NULL;
82 group_file = fopen_func(path, "r");
84 if (!group_file) return;
86 while ((line = xmalloc_fgetline(group_file)) != NULL) {
88 if (!strncmp(line, args[1], len)
91 /* Add the new user */
92 line = xasprintf("%s%s%s", line,
93 last_char_is(line, ':') ? "" : ",",
96 llist_add_to_end(&plist, line);
99 if (ENABLE_FEATURE_CLEAN_UP) {
101 group_file = fopen_func(path, "w");
102 while ((line = llist_pop(&plist))) {
104 fprintf(group_file, "%s\n", line);
110 group_file = fopen_func(path, "w");
112 while ((line = llist_pop(&plist)))
113 fprintf(group_file, "%s\n", line);
119 * addgroup will take a login_name as its first parameter.
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.
125 int addgroup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
126 int addgroup_main(int argc UNUSED_PARAM, char **argv)
131 /* need to be root */
133 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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);
145 /* move past the commandline options */
149 #if ENABLE_FEATURE_ADDUSER_TO_GROUP
154 /* -g was there, but "addgroup -g num user group"
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 */
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);
175 #endif /* ENABLE_FEATURE_ADDUSER_TO_GROUP */
177 die_if_bad_username(argv[0]);
178 new_group(argv[0], gid);
181 /* Reached only on success */