git.maemo.org Git - busybox4maemo/blob - loginutils/deluser.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * deluser/delgroup implementation for busybox
   4  *
   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>
   8  *
   9  * Licensed under GPL version 2, see file LICENSE in this tarball for details.
  10  *
  11  */
  12
  13 #include "libbb.h"
  14
  15 /* Status */
  16 #define STATUS_OK            0
  17 #define NAME_NOT_FOUND       1
  18 #define MEMBER_NOT_FOUND     2
  19
  20 static void del_line_matching(char **args,
  21                 const char *filename,
  22                 FILE *(*fopen_func)(const char *fileName, const char *mode))
  23 {
  24         FILE *passwd;
  25         smallint error = NAME_NOT_FOUND;
  26         char *name = (ENABLE_FEATURE_DEL_USER_FROM_GROUP && args[2]) ? args[2] : args[1];
  27         char *line, *del;
  28         char *new = xzalloc(1);
  29
  30         passwd = fopen_func(filename, "r");
  31         if (passwd) {
  32                 while ((line = xmalloc_fgets(passwd))) {
  33                         int len = strlen(name);
  34
  35                         if (strncmp(line, name, len) == 0
  36                          && line[len] == ':'
  37                         ) {
  38                                 error = STATUS_OK;
  39                                 if (ENABLE_FEATURE_DEL_USER_FROM_GROUP) {
  40                                         struct group *gr;
  41                                         char *p;
  42                                         if (args[2]
  43                                          /* There were two args on commandline */
  44                                          && (gr = getgrnam(name))
  45                                          /* The group was not deleted in the meanwhile */
  46                                          && (p = strrchr(line, ':'))
  47                                          /* We can find a pointer to the last ':' */
  48                                         ) {
  49                                                 error = MEMBER_NOT_FOUND;
  50                                                 /* Move past ':' (worst case to '\0') and cut the line */
  51                                                 p[1] = '\0';
  52                                                 /* Reuse p */
  53                                                 for (p = xzalloc(1); *gr->gr_mem != NULL; gr->gr_mem++) {
  54                                                         /* Add all the other group members */
  55                                                         if (strcmp(args[1], *gr->gr_mem) != 0) {
  56                                                                 del = p;
  57                                                                 p = xasprintf("%s%s%s", p, p[0] ? "," : "", *gr->gr_mem);
  58                                                                 free(del);
  59                                                         } else
  60                                                                 error = STATUS_OK;
  61                                                 }
  62                                                 /* Recompose the line */
  63                                                 line = xasprintf("%s%s\n", line, p);
  64                                                 if (ENABLE_FEATURE_CLEAN_UP) free(p);
  65                                         } else
  66                                                 goto skip;
  67                                 }
  68                         }
  69                         del = new;
  70                         new = xasprintf("%s%s", new, line);
  71                         free(del);
  72  skip:
  73                         free(line);
  74                 }
  75
  76                 if (ENABLE_FEATURE_CLEAN_UP) fclose(passwd);
  77
  78                 if (error) {
  79                         if (ENABLE_FEATURE_DEL_USER_FROM_GROUP && error == MEMBER_NOT_FOUND) {
  80                                 /* Set the correct values for error message */
  81                                 filename = name;
  82                                 name = args[1];
  83                         }
  84                         bb_error_msg("can't find %s in %s", name, filename);
  85                 } else {
  86                         passwd = fopen_func(filename, "w");
  87                         if (passwd) {
  88                                 fputs(new, passwd);
  89                                 if (ENABLE_FEATURE_CLEAN_UP) fclose(passwd);
  90                         }
  91                 }
  92         }
  93         free(new);
  94 }
  95
  96 int deluser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  97 int deluser_main(int argc, char **argv)
  98 {
  99         if (argc == 2
 100          || (ENABLE_FEATURE_DEL_USER_FROM_GROUP
 101             && (applet_name[3] == 'g' && argc == 3))
 102         ) {
 103                 if (geteuid())
 104                         bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
 105
 106                 if ((ENABLE_FEATURE_DEL_USER_FROM_GROUP && argc != 3)
 107                  || ENABLE_DELUSER
 108                  || (ENABLE_DELGROUP && ENABLE_DESKTOP)
 109                 ) {
 110                         if (ENABLE_DELUSER
 111                          && (!ENABLE_DELGROUP || applet_name[3] == 'u')
 112                         ) {
 113                                 del_line_matching(argv, bb_path_passwd_file, xfopen);
 114                                 if (ENABLE_FEATURE_SHADOWPASSWDS)
 115                                         del_line_matching(argv, bb_path_shadow_file, fopen_or_warn);
 116                         } else if (ENABLE_DESKTOP && ENABLE_DELGROUP && getpwnam(argv[1]))
 117                                 bb_error_msg_and_die("can't remove primary group of user %s", argv[1]);
 118                 }
 119                 del_line_matching(argv, bb_path_group_file, xfopen);
 120                 if (ENABLE_FEATURE_SHADOWPASSWDS)
 121                         del_line_matching(argv, bb_path_gshadow_file, fopen_or_warn);
 122                 return EXIT_SUCCESS;
 123         } else
 124                 bb_show_usage();
 125 }