/* vi: set sw=4 ts=4: */
/*
- * deluser (remove lusers from the system ;) for TinyLogin
+ * deluser/delgroup implementation for busybox
*
* Copyright (C) 1999 by Lineo, inc. and John Beppu
* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
- * Unified with delgroup by Tito Ragusa <farmatito@tiscali.it>
+ * Copyright (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
*
* Licensed under GPL version 2, see file LICENSE in this tarball for details.
*
*/
-#include "busybox.h"
+#include "libbb.h"
-/* where to start and stop deletion */
-typedef struct {
- size_t start;
- size_t stop;
-} Bounds;
+/* Status */
+#define STATUS_OK 0
+#define NAME_NOT_FOUND 1
+#define MEMBER_NOT_FOUND 2
-/* An interesting side-effect of boundary()'s
- * implementation is that the first user (typically root)
- * cannot be removed. Let's call it a feature. */
-static inline Bounds boundary(const char *buffer, const char *login)
+static void del_line_matching(char **args,
+ const char *filename,
+ FILE* FAST_FUNC (*fopen_func)(const char *fileName, const char *mode))
{
- char needle[256];
- char *start;
- char *stop;
- Bounds b;
-
- snprintf(needle, 256, "\n%s:", login);
- needle[255] = 0;
- start = strstr(buffer, needle);
- if (!start) {
- b.start = 0;
- b.stop = 0;
- return b;
- }
- start++;
+ FILE *passwd;
+ smallint error = NAME_NOT_FOUND;
+ char *name = (ENABLE_FEATURE_DEL_USER_FROM_GROUP && args[2]) ? args[2] : args[1];
+ char *line, *del;
+ char *new = xzalloc(1);
- stop = strchr(start, '\n');
- b.start = start - buffer;
- b.stop = stop - buffer;
- return b;
-}
+ passwd = fopen_func(filename, "r");
+ if (passwd) {
+ while ((line = xmalloc_fgets(passwd))) {
+ int len = strlen(name);
-/* grep -v ^login (except it only deletes the first match) */
-/* ...in fact, I think I'm going to simplify this later */
-static void del_line_matching(const char *login, const char *filename)
-{
- char *buffer;
- FILE *passwd;
- Bounds b;
- struct stat statbuf;
+ if (strncmp(line, name, len) == 0
+ && line[len] == ':'
+ ) {
+ error = STATUS_OK;
+ if (ENABLE_FEATURE_DEL_USER_FROM_GROUP) {
+ struct group *gr;
+ char *p;
+ if (args[2]
+ /* There were two args on commandline */
+ && (gr = getgrnam(name))
+ /* The group was not deleted in the meanwhile */
+ && (p = strrchr(line, ':'))
+ /* We can find a pointer to the last ':' */
+ ) {
+ error = MEMBER_NOT_FOUND;
+ /* Move past ':' (worst case to '\0') and cut the line */
+ p[1] = '\0';
+ /* Reuse p */
+ for (p = xzalloc(1); *gr->gr_mem != NULL; gr->gr_mem++) {
+ /* Add all the other group members */
+ if (strcmp(args[1], *gr->gr_mem) != 0) {
+ del = p;
+ p = xasprintf("%s%s%s", p, p[0] ? "," : "", *gr->gr_mem);
+ free(del);
+ } else
+ error = STATUS_OK;
+ }
+ /* Recompose the line */
+ line = xasprintf("%s%s\n", line, p);
+ if (ENABLE_FEATURE_CLEAN_UP) free(p);
+ } else
+ goto skip;
+ }
+ }
+ del = new;
+ new = xasprintf("%s%s", new, line);
+ free(del);
+ skip:
+ free(line);
+ }
+ if (ENABLE_FEATURE_CLEAN_UP) fclose(passwd);
- if ((passwd = fopen_or_warn(filename, "r"))) {
- // Remove pointless const.
- xstat((char *)filename, &statbuf);
- buffer = (char *) xmalloc(statbuf.st_size * sizeof(char));
- fread(buffer, statbuf.st_size, sizeof(char), passwd);
- fclose(passwd);
- /* find the user to remove */
- b = boundary(buffer, login);
- if (b.stop != 0) {
- /* write the file w/o the user */
- if ((passwd = fopen_or_warn(filename, "w"))) {
- fwrite(buffer, (b.start - 1), sizeof(char), passwd);
- fwrite(&buffer[b.stop], (statbuf.st_size - b.stop), sizeof(char), passwd);
- fclose(passwd);
+ if (error) {
+ if (ENABLE_FEATURE_DEL_USER_FROM_GROUP && error == MEMBER_NOT_FOUND) {
+ /* Set the correct values for error message */
+ filename = name;
+ name = args[1];
}
+ bb_error_msg("can't find %s in %s", name, filename);
} else {
- bb_error_msg("can't find '%s' in '%s'", login, filename);
+ passwd = fopen_func(filename, "w");
+ if (passwd) {
+ fputs(new, passwd);
+ if (ENABLE_FEATURE_CLEAN_UP) fclose(passwd);
+ }
}
- free(buffer);
}
+ free(new);
}
+int deluser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int deluser_main(int argc, char **argv)
{
- if (argc != 2) {
- bb_show_usage();
- } else {
- if (ENABLE_DELUSER && applet_name[3] == 'u') {
- del_line_matching(argv[1], bb_path_passwd_file);
- if (ENABLE_FEATURE_SHADOWPASSWDS)
- del_line_matching(argv[1], bb_path_shadow_file);
+ if (argc == 2
+ || (ENABLE_FEATURE_DEL_USER_FROM_GROUP
+ && (applet_name[3] == 'g' && argc == 3))
+ ) {
+ if (geteuid())
+ bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
+
+ if ((ENABLE_FEATURE_DEL_USER_FROM_GROUP && argc != 3)
+ || ENABLE_DELUSER
+ || (ENABLE_DELGROUP && ENABLE_DESKTOP)
+ ) {
+ if (ENABLE_DELUSER
+ && (!ENABLE_DELGROUP || applet_name[3] == 'u')
+ ) {
+ del_line_matching(argv, bb_path_passwd_file, xfopen);
+ if (ENABLE_FEATURE_SHADOWPASSWDS)
+ del_line_matching(argv, bb_path_shadow_file, fopen_or_warn);
+ } else if (ENABLE_DESKTOP && ENABLE_DELGROUP && getpwnam(argv[1]))
+ bb_error_msg_and_die("can't remove primary group of user %s", argv[1]);
}
- del_line_matching(argv[1], bb_path_group_file);
+ del_line_matching(argv, bb_path_group_file, xfopen);
if (ENABLE_FEATURE_SHADOWPASSWDS)
- del_line_matching(argv[1], bb_path_gshadow_file);
- }
- return (EXIT_SUCCESS);
+ del_line_matching(argv, bb_path_gshadow_file, fopen_or_warn);
+ return EXIT_SUCCESS;
+ } else
+ bb_show_usage();
}
-
-/* $Id: deluser.c,v 1.4 2003/07/14 20:20:45 andersen Exp $ */
projects / oweals / busybox.git / blobdiff