misc/chattr.c

   1 /*
   2  * chattr.c             - Change file attributes on an ext2 file system
   3  *
   4  * Copyright (C) 1993, 1994  Remy Card <card@masi.ibp.fr>
   5  *                           Laboratoire MASI, Institut Blaise Pascal
   6  *                           Universite Pierre et Marie Curie (Paris VI)
   7  *
   8  * This file can be redistributed under the terms of the GNU General
   9  * Public License
  10  */
  11
  12 /*
  13  * History:
  14  * 93/10/30     - Creation
  15  * 93/11/13     - Replace stat() calls by lstat() to avoid loops
  16  * 94/02/27     - Integrated in Ted's distribution
  17  * 98/12/29     - Ignore symlinks when working recursively (G M Sipe)
  18  * 98/12/29     - Display version info only when -V specified (G M Sipe)
  19  */
  20
  21 #define _LARGEFILE64_SOURCE
  22
  23 #include "config.h"
  24 #include <sys/types.h>
  25 #include <dirent.h>
  26 #include <fcntl.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #ifdef HAVE_ERRNO_H
  32 #include <errno.h>
  33 #endif
  34 #include <sys/param.h>
  35 #include <sys/stat.h>
  36 #include "ext2fs/ext2_fs.h"
  37
  38 #ifdef __GNUC__
  39 #define EXT2FS_ATTR(x) __attribute__(x)
  40 #else
  41 #define EXT2FS_ATTR(x)
  42 #endif
  43
  44 #ifndef S_ISLNK                 /* So we can compile even with gcc-warn */
  45 # ifdef __S_IFLNK
  46 #  define S_ISLNK(mode)  __S_ISTYPE((mode), __S_IFLNK)
  47 # else
  48 #  define S_ISLNK(mode)  0
  49 # endif
  50 #endif
  51
  52 #include "et/com_err.h"
  53 #include "e2p/e2p.h"
  54
  55 #include "../version.h"
  56 #include "nls-enable.h"
  57
  58 static const char * program_name = "chattr";
  59
  60 static int add;
  61 static int rem;
  62 static int set;
  63 static int set_version;
  64
  65 static unsigned long version;
  66
  67 static int recursive;
  68 static int verbose;
  69 static int silent;
  70
  71 static unsigned long af;
  72 static unsigned long rf;
  73 static unsigned long sf;
  74
  75 #ifdef _LFS64_LARGEFILE
  76 #define LSTAT           lstat64
  77 #define STRUCT_STAT     struct stat64
  78 #else
  79 #define LSTAT           lstat
  80 #define STRUCT_STAT     struct stat
  81 #endif
  82
  83 static void usage(void)
  84 {
  85         fprintf(stderr,
  86                 _("Usage: %s [-RVf] [-+=AacDdeijsSu] [-v version] files...\n"),
  87                 program_name);
  88         exit(1);
  89 }
  90
  91 struct flags_char {
  92         unsigned long   flag;
  93         char            optchar;
  94 };
  95
  96 static const struct flags_char flags_array[] = {
  97         { EXT2_NOATIME_FL, 'A' },
  98         { EXT2_SYNC_FL, 'S' },
  99         { EXT2_DIRSYNC_FL, 'D' },
 100         { EXT2_APPEND_FL, 'a' },
 101         { EXT2_COMPR_FL, 'c' },
 102         { EXT2_NODUMP_FL, 'd' },
 103         { EXT4_EXTENTS_FL, 'e'},
 104         { EXT2_IMMUTABLE_FL, 'i' },
 105         { EXT3_JOURNAL_DATA_FL, 'j' },
 106         { EXT2_SECRM_FL, 's' },
 107         { EXT2_UNRM_FL, 'u' },
 108         { EXT2_NOTAIL_FL, 't' },
 109         { EXT2_TOPDIR_FL, 'T' },
 110         { FS_NOCOW_FL, 'C' },
 111         { 0, 0 }
 112 };
 113
 114 static unsigned long get_flag(char c)
 115 {
 116         const struct flags_char *fp;
 117
 118         for (fp = flags_array; fp->flag != 0; fp++) {
 119                 if (fp->optchar == c)
 120                         return fp->flag;
 121         }
 122         return 0;
 123 }
 124
 125
 126 static int decode_arg (int * i, int argc, char ** argv)
 127 {
 128         char * p;
 129         char * tmp;
 130         unsigned long fl;
 131
 132         switch (argv[*i][0])
 133         {
 134         case '-':
 135                 for (p = &argv[*i][1]; *p; p++) {
 136                         if (*p == 'R') {
 137                                 recursive = 1;
 138                                 continue;
 139                         }
 140                         if (*p == 'V') {
 141                                 verbose = 1;
 142                                 continue;
 143                         }
 144                         if (*p == 'f') {
 145                                 silent = 1;
 146                                 continue;
 147                         }
 148                         if (*p == 'v') {
 149                                 (*i)++;
 150                                 if (*i >= argc)
 151                                         usage ();
 152                                 version = strtol (argv[*i], &tmp, 0);
 153                                 if (*tmp) {
 154                                         com_err (program_name, 0,
 155                                                  _("bad version - %s\n"),
 156                                                  argv[*i]);
 157                                         usage ();
 158                                 }
 159                                 set_version = 1;
 160                                 continue;
 161                         }
 162                         if ((fl = get_flag(*p)) == 0)
 163                                 usage();
 164                         rf |= fl;
 165                         rem = 1;
 166                 }
 167                 break;
 168         case '+':
 169                 add = 1;
 170                 for (p = &argv[*i][1]; *p; p++) {
 171                         if ((fl = get_flag(*p)) == 0)
 172                                 usage();
 173                         af |= fl;
 174                 }
 175                 break;
 176         case '=':
 177                 set = 1;
 178                 for (p = &argv[*i][1]; *p; p++) {
 179                         if ((fl = get_flag(*p)) == 0)
 180                                 usage();
 181                         sf |= fl;
 182                 }
 183                 break;
 184         default:
 185                 return EOF;
 186                 break;
 187         }
 188         return 1;
 189 }
 190
 191 static int chattr_dir_proc(const char *, struct dirent *, void *);
 192
 193 static int change_attributes(const char * name)
 194 {
 195         unsigned long flags;
 196         STRUCT_STAT     st;
 197         int extent_file = 0;
 198
 199         if (LSTAT (name, &st) == -1) {
 200                 if (!silent)
 201                         com_err (program_name, errno,
 202                                  _("while trying to stat %s"), name);
 203                 return -1;
 204         }
 205
 206         if (fgetflags(name, &flags) == -1) {
 207                 if (!silent)
 208                         com_err(program_name, errno,
 209                                         _("while reading flags on %s"), name);
 210                 return -1;
 211         }
 212         if (flags & EXT4_EXTENTS_FL)
 213                 extent_file = 1;
 214         if (set) {
 215                 if (extent_file && !(sf & EXT4_EXTENTS_FL)) {
 216                         if (!silent)
 217                                 com_err(program_name, 0,
 218                                 _("Clearing extent flag not supported on %s"),
 219                                         name);
 220                         return -1;
 221                 }
 222                 if (verbose) {
 223                         printf (_("Flags of %s set as "), name);
 224                         print_flags (stdout, sf, 0);
 225                         printf ("\n");
 226                 }
 227                 if (fsetflags (name, sf) == -1)
 228                         perror (name);
 229         } else {
 230                 if (rem)
 231                         flags &= ~rf;
 232                 if (add)
 233                         flags |= af;
 234                 if (extent_file && !(flags & EXT4_EXTENTS_FL)) {
 235                         if (!silent)
 236                                 com_err(program_name, 0,
 237                                 _("Clearing extent flag not supported on %s"),
 238                                         name);
 239                         return -1;
 240                 }
 241                 if (verbose) {
 242                         printf(_("Flags of %s set as "), name);
 243                         print_flags(stdout, flags, 0);
 244                         printf("\n");
 245                 }
 246                 if (!S_ISDIR(st.st_mode))
 247                         flags &= ~EXT2_DIRSYNC_FL;
 248                 if (fsetflags(name, flags) == -1) {
 249                         if (!silent) {
 250                                 com_err(program_name, errno,
 251                                                 _("while setting flags on %s"),
 252                                                 name);
 253                         }
 254                         return -1;
 255                 }
 256         }
 257         if (set_version) {
 258                 if (verbose)
 259                         printf (_("Version of %s set as %lu\n"), name, version);
 260                 if (fsetversion (name, version) == -1) {
 261                         if (!silent)
 262                                 com_err (program_name, errno,
 263                                          _("while setting version on %s"),
 264                                          name);
 265                         return -1;
 266                 }
 267         }
 268         if (S_ISDIR(st.st_mode) && recursive)
 269                 return iterate_on_dir (name, chattr_dir_proc, NULL);
 270         return 0;
 271 }
 272
 273 static int chattr_dir_proc (const char * dir_name, struct dirent * de,
 274                             void * private EXT2FS_ATTR((unused)))
 275 {
 276         int ret = 0;
 277
 278         if (strcmp (de->d_name, ".") && strcmp (de->d_name, "..")) {
 279                 char *path;
 280
 281                 path = malloc(strlen (dir_name) + 1 + strlen (de->d_name) + 1);
 282                 if (!path) {
 283                         fprintf(stderr, _("Couldn't allocate path variable "
 284                                           "in chattr_dir_proc"));
 285                         return -1;
 286                 }
 287                 sprintf(path, "%s/%s", dir_name, de->d_name);
 288                 ret = change_attributes(path);
 289                 free(path);
 290         }
 291         return ret;
 292 }
 293
 294 int main (int argc, char ** argv)
 295 {
 296         int i, j;
 297         int end_arg = 0;
 298         int err, retval = 0;
 299
 300 #ifdef ENABLE_NLS
 301         setlocale(LC_MESSAGES, "");
 302         setlocale(LC_CTYPE, "");
 303         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 304         textdomain(NLS_CAT_NAME);
 305         set_com_err_gettext(gettext);
 306 #endif
 307         if (argc && *argv)
 308                 program_name = *argv;
 309         i = 1;
 310         while (i < argc && !end_arg) {
 311                 /* '--' arg should end option processing */
 312                 if (strcmp(argv[i], "--") == 0) {
 313                         i++;
 314                         end_arg = 1;
 315                 } else if (decode_arg (&i, argc, argv) == EOF)
 316                         end_arg = 1;
 317                 else
 318                         i++;
 319         }
 320         if (i >= argc)
 321                 usage ();
 322         if (set && (add || rem)) {
 323                 fputs(_("= is incompatible with - and +\n"), stderr);
 324                 exit (1);
 325         }
 326         if ((rf & af) != 0) {
 327                 fputs("Can't both set and unset same flag.\n", stderr);
 328                 exit (1);
 329         }
 330         if (!(add || rem || set || set_version)) {
 331                 fputs(_("Must use '-v', =, - or +\n"), stderr);
 332                 exit (1);
 333         }
 334         if (verbose)
 335                 fprintf (stderr, "chattr %s (%s)\n",
 336                          E2FSPROGS_VERSION, E2FSPROGS_DATE);
 337         for (j = i; j < argc; j++) {
 338                 err = change_attributes (argv[j]);
 339                 if (err)
 340                         retval = 1;
 341         }
 342         exit(retval);
 343 }