release/src/router/busybox/e2fsprogs/old_e2fsprogs/chattr.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * chattr.c             - Change file attributes on an ext2 file system
   4  *
   5  * Copyright (C) 1993, 1994  Remy Card <card@masi.ibp.fr>
   6  *                           Laboratoire MASI, Institut Blaise Pascal
   7  *                           Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  * This file can be redistributed under the terms of the GNU General
  10  * Public License
  11  */
  12
  13 /*
  14  * History:
  15  * 93/10/30     - Creation
  16  * 93/11/13     - Replace stat() calls by lstat() to avoid loops
  17  * 94/02/27     - Integrated in Ted's distribution
  18  * 98/12/29     - Ignore symlinks when working recursively (G M Sipe)
  19  * 98/12/29     - Display version info only when -V specified (G M Sipe)
  20  */
  21
  22 #include <sys/types.h>
  23 #include <dirent.h>
  24 #include <fcntl.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <errno.h>
  30 #include <sys/param.h>
  31 #include <sys/stat.h>
  32 #include "ext2fs/ext2_fs.h"
  33
  34 #ifdef __GNUC__
  35 # define EXT2FS_ATTR(x) __attribute__(x)
  36 #else
  37 # define EXT2FS_ATTR(x)
  38 #endif
  39
  40 #include "e2fsbb.h"
  41 #include "e2p/e2p.h"
  42
  43 #define OPT_ADD 1
  44 #define OPT_REM 2
  45 #define OPT_SET 4
  46 #define OPT_SET_VER 8
  47 static int flags;
  48 static int recursive;
  49
  50 static unsigned long version;
  51
  52 static unsigned long af;
  53 static unsigned long rf;
  54 static unsigned long sf;
  55
  56 struct flags_char {
  57         unsigned long flag;
  58         char optchar;
  59 };
  60
  61 static const struct flags_char flags_array[] = {
  62         { EXT2_NOATIME_FL,      'A' },
  63         { EXT2_SYNC_FL,         'S' },
  64         { EXT2_DIRSYNC_FL,      'D' },
  65         { EXT2_APPEND_FL,       'a' },
  66         { EXT2_COMPR_FL,        'c' },
  67         { EXT2_NODUMP_FL,       'd' },
  68         { EXT2_IMMUTABLE_FL,    'i' },
  69         { EXT3_JOURNAL_DATA_FL, 'j' },
  70         { EXT2_SECRM_FL,        's' },
  71         { EXT2_UNRM_FL,         'u' },
  72         { EXT2_NOTAIL_FL,       't' },
  73         { EXT2_TOPDIR_FL,       'T' },
  74         { 0, 0 }
  75 };
  76
  77 static unsigned long get_flag(char c)
  78 {
  79         const struct flags_char *fp;
  80         for (fp = flags_array; fp->flag; fp++)
  81                 if (fp->optchar == c)
  82                         return fp->flag;
  83         bb_show_usage();
  84         return 0;
  85 }
  86
  87 static int decode_arg(char *arg)
  88 {
  89         unsigned long *fl;
  90         char opt = *arg++;
  91
  92         if (opt == '-') {
  93                 flags |= OPT_REM;
  94                 fl = &rf;
  95         } else if (opt == '+') {
  96                 flags |= OPT_ADD;
  97                 fl = &af;
  98         } else if (opt == '=') {
  99                 flags |= OPT_SET;
 100                 fl = &sf;
 101         } else
 102                 return EOF;
 103
 104         for (; *arg; ++arg)
 105                 (*fl) |= get_flag(*arg);
 106
 107         return 1;
 108 }
 109
 110 static int chattr_dir_proc(const char *, struct dirent *, void *);
 111
 112 static void change_attributes(const char * name)
 113 {
 114         unsigned long fsflags;
 115         struct stat st;
 116
 117         if (lstat(name, &st) == -1) {
 118                 bb_error_msg("stat %s failed", name);
 119                 return;
 120         }
 121         if (S_ISLNK(st.st_mode) && recursive)
 122                 return;
 123
 124         /* Don't try to open device files, fifos etc.  We probably
 125          * ought to display an error if the file was explicitly given
 126          * on the command line (whether or not recursive was
 127          * requested).  */
 128         if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
 129                 return;
 130
 131         if (flags & OPT_SET_VER)
 132                 if (fsetversion(name, version) == -1)
 133                         bb_error_msg("setting version on %s", name);
 134
 135         if (flags & OPT_SET) {
 136                 fsflags = sf;
 137         } else {
 138                 if (fgetflags(name, &fsflags) == -1) {
 139                         bb_error_msg("reading flags on %s", name);
 140                         goto skip_setflags;
 141                 }
 142                 if (flags & OPT_REM)
 143                         fsflags &= ~rf;
 144                 if (flags & OPT_ADD)
 145                         fsflags |= af;
 146                 if (!S_ISDIR(st.st_mode))
 147                         fsflags &= ~EXT2_DIRSYNC_FL;
 148         }
 149         if (fsetflags(name, fsflags) == -1)
 150                 bb_error_msg("setting flags on %s", name);
 151
 152 skip_setflags:
 153         if (S_ISDIR(st.st_mode) && recursive)
 154                 iterate_on_dir(name, chattr_dir_proc, NULL);
 155 }
 156
 157 static int chattr_dir_proc(const char *dir_name, struct dirent *de,
 158                            void *private EXT2FS_ATTR((unused)))
 159 {
 160         /*if (strcmp(de->d_name, ".") || strcmp(de->d_name, "..")) {*/
 161         if (de->d_name[0] == '.'
 162          && (!de->d_name[1] || (de->d_name[1] == '.' && !de->d_name[2]))
 163         ) {
 164                 char *path = concat_subpath_file(dir_name, de->d_name);
 165                 if (path) {
 166                         change_attributes(path);
 167                         free(path);
 168                 }
 169         }
 170         return 0;
 171 }
 172
 173 int chattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 174 int chattr_main(int argc, char **argv)
 175 {
 176         int i;
 177         char *arg;
 178
 179         /* parse the args */
 180         for (i = 1; i < argc; ++i) {
 181                 arg = argv[i];
 182
 183                 /* take care of -R and -v <version> */
 184                 if (arg[0] == '-') {
 185                         if (arg[1] == 'R' && arg[2] == '\0') {
 186                                 recursive = 1;
 187                                 continue;
 188                         } else if (arg[1] == 'v' && arg[2] == '\0') {
 189                                 char *tmp;
 190                                 ++i;
 191                                 if (i >= argc)
 192                                         bb_show_usage();
 193                                 version = strtol(argv[i], &tmp, 0);
 194                                 if (*tmp)
 195                                         bb_error_msg_and_die("bad version '%s'", arg);
 196                                 flags |= OPT_SET_VER;
 197                                 continue;
 198                         }
 199                 }
 200
 201                 if (decode_arg(arg) == EOF)
 202                         break;
 203         }
 204
 205         /* run sanity checks on all the arguments given us */
 206         if (i >= argc)
 207                 bb_show_usage();
 208         if ((flags & OPT_SET) && ((flags & OPT_ADD) || (flags & OPT_REM)))
 209                 bb_error_msg_and_die("= is incompatible with - and +");
 210         if ((rf & af) != 0)
 211                 bb_error_msg_and_die("Can't set and unset a flag");
 212         if (!flags)
 213                 bb_error_msg_and_die("Must use '-v', =, - or +");
 214
 215         /* now run chattr on all the files passed to us */
 216         while (i < argc)
 217                 change_attributes(argv[i++]);
 218
 219         return EXIT_SUCCESS;
 220 }