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