/* vi: set sw=4 ts=4: */
/*
- * addgroup - add users to /etc/passwd and /etc/shadow
+ * addgroup - add groups to /etc/group and /etc/gshadow
*
* Copyright (C) 1999 by Lineo, inc. and John Beppu
* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
+ * Copyright (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
*/
-#include "busybox.h"
+#include "libbb.h"
-/* make sure gr_name isn't taken, make sure gid is kosher
- * return 1 on failure */
-static int group_study(struct group *g)
+static void xgroup_study(struct group *g)
{
- enum { max = 65000 };
- FILE *etc_group;
- gid_t desired;
- /* Using _r function to avoid static buffers pulled in */
- char buffer[256];
- struct group grp;
- struct group *result;
-
- etc_group = xfopen(bb_path_group_file, "r");
-
- /* make sure gr_name isn't taken, make sure gid is kosher */
- desired = g->gr_gid;
- while (!fgetgrent_r(etc_group, &grp, buffer, sizeof(buffer), &result)) {
- if ((strcmp(grp.gr_name, g->gr_name)) == 0) {
- bb_error_msg_and_die("%s: group already in use", g->gr_name);
+ /* Make sure gr_name is unused */
+ if (getgrnam(g->gr_name)) {
+ goto error;
+ }
+
+ /* Check if the desired gid is free
+ * or find the first free one */
+ while (1) {
+ if (!getgrgid(g->gr_gid)) {
+ return; /* found free group: return */
}
- if ((desired) && grp.gr_gid == desired) {
- bb_error_msg_and_die("%d: gid already in use",
- desired);
+ if (option_mask32) {
+ /* -g N, cannot pick gid other than N: error */
+ g->gr_name = itoa(g->gr_gid);
+ goto error;
}
- if ((grp.gr_gid > g->gr_gid) && (grp.gr_gid < max)) {
- g->gr_gid = grp.gr_gid;
+ g->gr_gid++;
+ if (g->gr_gid <= 0) {
+ /* overflowed: error */
+ bb_error_msg_and_die("no gids left");
}
}
- if (ENABLE_FEATURE_CLEAN_UP)
- fclose(etc_group);
- /* gid */
- g->gr_gid++;
- if (desired) {
- g->gr_gid = desired;
- }
- /* return 1; */
- return 0;
+ error:
+ /* exit */
+ bb_error_msg_and_die("group %s already exists", g->gr_name);
}
/* append a new user to the passwd file */
-static int addgroup(char *group, gid_t gid, const char *user)
+static void new_group(char *group, gid_t gid)
{
FILE *file;
struct group gr;
/* make sure gid and group haven't already been allocated */
gr.gr_gid = gid;
gr.gr_name = group;
- if (group_study(&gr))
- return 1;
+ xgroup_study(&gr);
/* add entry to group */
file = xfopen(bb_path_group_file, "a");
/* group:passwd:gid:userlist */
- fprintf(file, "%s:%s:%d:%s\n", group, "x", gr.gr_gid, user);
+ fprintf(file, "%s:x:%u:\n", group, (unsigned)gr.gr_gid);
if (ENABLE_FEATURE_CLEAN_UP)
fclose(file);
-
#if ENABLE_FEATURE_SHADOWPASSWDS
file = fopen_or_warn(bb_path_gshadow_file, "a");
if (file) {
fclose(file);
}
#endif
+}
+
+#if ENABLE_FEATURE_ADDUSER_TO_GROUP
+static void add_user_to_group(char **args,
+ const char *path,
+ FILE *(*fopen_func)(const char *fileName, const char *mode))
+{
+ char *line;
+ int len = strlen(args[1]);
+ llist_t *plist = NULL;
+ FILE *group_file;
- /* return 1; */
- return 0;
+ group_file = fopen_func(path, "r");
+
+ if (!group_file) return;
+
+ while ((line = xmalloc_getline(group_file))) {
+ /* Find the group */
+ if (!strncmp(line, args[1], len)
+ && line[len] == ':'
+ ) {
+ /* Add the new user */
+ line = xasprintf("%s%s%s", line,
+ last_char_is(line, ':') ? "" : ",",
+ args[0]);
+ }
+ llist_add_to_end(&plist, line);
+ }
+
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ fclose(group_file);
+ group_file = fopen_func(path, "w");
+ while ((line = llist_pop(&plist))) {
+ if (group_file)
+ fprintf(group_file, "%s\n", line);
+ free(line);
+ }
+ if (group_file)
+ fclose(group_file);
+ } else {
+ group_file = fopen_func(path, "w");
+ if (group_file)
+ while ((line = llist_pop(&plist)))
+ fprintf(group_file, "%s\n", line);
+ }
}
+#endif
/*
* addgroup will take a login_name as its first parameter.
*
* gid can be customized via command-line parameters.
+ * If called with two non-option arguments, addgroup
+ * will add an existing user to an existing group.
*/
-int addgroup_main(int argc, char **argv);
-int addgroup_main(int argc, char **argv)
+int addgroup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int addgroup_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
char *group;
gid_t gid = 0;
- /* check for min, max and missing args and exit on error */
- opt_complementary = "-1:?2:?";
- if (getopt32(argc, argv, "g:", &group)) {
- gid = xatoul_range(group, 0, (gid_t)ULONG_MAX);
- }
- /* move past the commandline options */
- argv += optind;
-
/* need to be root */
if (geteuid()) {
bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
}
- return addgroup(argv[0], gid, argv[1] ? argv[1] : "");
+ /* Syntax:
+ * addgroup group
+ * addgroup -g num group
+ * addgroup user group
+ * Check for min, max and missing args */
+ opt_complementary = "-1:?2";
+ if (getopt32(argv, "g:", &group)) {
+ gid = xatoul_range(group, 0, ((unsigned long)(gid_t)ULONG_MAX) >> 1);
+ }
+ /* move past the commandline options */
+ argv += optind;
+ //argc -= optind;
+
+#if ENABLE_FEATURE_ADDUSER_TO_GROUP
+ if (argv[1]) {
+ struct group *gr;
+
+ if (option_mask32) {
+ /* -g was there, but "addgroup -g num user group"
+ * is a no-no */
+ bb_show_usage();
+ }
+
+ /* check if group and user exist */
+ xuname2uid(argv[0]); /* unknown user: exit */
+ xgroup2gid(argv[1]); /* unknown group: exit */
+ /* check if user is already in this group */
+ gr = getgrnam(argv[1]);
+ for (; *(gr->gr_mem) != NULL; (gr->gr_mem)++) {
+ if (!strcmp(argv[0], *(gr->gr_mem))) {
+ /* user is already in group: do nothing */
+ return EXIT_SUCCESS;
+ }
+ }
+ add_user_to_group(argv, bb_path_group_file, xfopen);
+#if ENABLE_FEATURE_SHADOWPASSWDS
+ add_user_to_group(argv, bb_path_gshadow_file, fopen_or_warn);
+#endif
+ } else
+#endif /* ENABLE_FEATURE_ADDUSER_TO_GROUP */
+ new_group(argv[0], gid);
+
+ /* Reached only on success */
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff