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97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* deluser (remove lusers from the system ;) for TinyLogin
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*
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* Copyright (C) 1999 by Lineo, inc. and John Beppu
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* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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* Unified with delgroup by Tito Ragusa <farmatito@tiscali.it>
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*
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* Licensed under GPL version 2, see file LICENSE in this tarball for details.
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*
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*/
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#include "busybox.h"
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/* where to start and stop deletion */
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typedef struct {
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size_t start;
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size_t stop;
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} Bounds;
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/* An interesting side-effect of boundary()'s
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* implementation is that the first user (typically root)
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* cannot be removed. Let's call it a feature. */
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static inline Bounds boundary(const char *buffer, const char *login)
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{
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char needle[256];
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char *start;
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char *stop;
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Bounds b;
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snprintf(needle, 256, "\n%s:", login);
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needle[255] = 0;
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start = strstr(buffer, needle);
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if (!start) {
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b.start = 0;
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b.stop = 0;
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return b;
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}
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start++;
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stop = strchr(start, '\n');
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b.start = start - buffer;
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b.stop = stop - buffer;
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return b;
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}
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/* grep -v ^login (except it only deletes the first match) */
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/* ...in fact, I think I'm going to simplify this later */
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static void del_line_matching(const char *login, const char *filename)
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{
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char *buffer;
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FILE *passwd;
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Bounds b;
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struct stat statbuf;
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if ((passwd = bb_wfopen(filename, "r"))) {
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// Remove pointless const.
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xstat((char *)filename, &statbuf);
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buffer = (char *) xmalloc(statbuf.st_size * sizeof(char));
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fread(buffer, statbuf.st_size, sizeof(char), passwd);
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fclose(passwd);
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/* find the user to remove */
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b = boundary(buffer, login);
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if (b.stop != 0) {
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/* write the file w/o the user */
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if ((passwd = bb_wfopen(filename, "w"))) {
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fwrite(buffer, (b.start - 1), sizeof(char), passwd);
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fwrite(&buffer[b.stop], (statbuf.st_size - b.stop), sizeof(char), passwd);
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fclose(passwd);
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}
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} else {
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bb_error_msg("can't find '%s' in '%s'", login, filename);
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}
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free(buffer);
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}
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}
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int deluser_main(int argc, char **argv)
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{
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if (argc != 2) {
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bb_show_usage();
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} else {
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if (ENABLE_DELUSER && applet_name[3] == 'u') {
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del_line_matching(argv[1], bb_path_passwd_file);
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if (ENABLE_FEATURE_SHADOWPASSWDS)
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del_line_matching(argv[1], bb_path_shadow_file);
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}
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del_line_matching(argv[1], bb_path_group_file);
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if (ENABLE_FEATURE_SHADOWPASSWDS)
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del_line_matching(argv[1], bb_path_gshadow_file);
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}
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return (EXIT_SUCCESS);
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}
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/* $Id: deluser.c,v 1.4 2003/07/14 20:20:45 andersen Exp $ */
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