loginutils/deluser.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * deluser (remove lusers from the system ;) for TinyLogin
   4  *
   5  * Copyright (C) 1999 by Lineo, inc. and John Beppu
   6  * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
   7  * Unified with delgroup by Tito Ragusa <farmatito@tiscali.it>
   8  *
   9  * Licensed under GPL version 2, see file LICENSE in this tarball for details.
  10  *
  11  */
  12
  13 #include "busybox.h"
  14
  15 static void del_line_matching(const char *login, const char *filename)
  16 {
  17         char *line;
  18         FILE *passwd;
  19         int len = strlen(login);
  20         int found = 0;
  21         llist_t *plist = NULL;
  22
  23         passwd = fopen_or_warn(filename, "r");
  24         if (!passwd) return;
  25
  26         while ((line = xmalloc_fgets(passwd))) {
  27                 if (!strncmp(line, login, len)
  28                  && line[len] == ':'
  29                 ) {
  30                         found++;
  31                         free(line);
  32                 } else {
  33                         llist_add_to_end(&plist, line);
  34                 }
  35         }
  36
  37         if (!ENABLE_FEATURE_CLEAN_UP) {
  38                 if (!found) {
  39                         bb_error_msg("can't find '%s' in '%s'", login, filename);
  40                         return;
  41                 }
  42                 passwd = fopen_or_warn(filename, "w");
  43                 if (passwd)
  44                         while ((line = llist_pop(&plist)))
  45                                 fputs(line, passwd);
  46         } else {
  47                 if (!found) {
  48                         bb_error_msg("can't find '%s' in '%s'", login, filename);
  49                         goto clean_up;
  50                 }
  51                 fclose(passwd);
  52                 passwd = fopen_or_warn(filename, "w");
  53                 if (passwd) {
  54  clean_up:
  55                         while ((line = llist_pop(&plist))) {
  56                                 if (found) fputs(line, passwd);
  57                                 free(line);
  58                         }
  59                         fclose(passwd);
  60                 }
  61         }
  62 }
  63
  64 int deluser_main(int argc, char **argv);
  65 int deluser_main(int argc, char **argv)
  66 {
  67         if (argc != 2)
  68                 bb_show_usage();
  69
  70         if (ENABLE_DELUSER
  71          && (!ENABLE_DELGROUP || applet_name[3] == 'u')
  72         ) {
  73                 del_line_matching(argv[1], bb_path_passwd_file);
  74                 if (ENABLE_FEATURE_SHADOWPASSWDS)
  75                         del_line_matching(argv[1], bb_path_shadow_file);
  76         }
  77         del_line_matching(argv[1], bb_path_group_file);
  78         if (ENABLE_FEATURE_SHADOWPASSWDS)
  79                 del_line_matching(argv[1], bb_path_gshadow_file);
  80
  81         return EXIT_SUCCESS;
  82 }
  83