[821] | 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 | #include <sys/types.h>
|
---|
| 22 | #include <dirent.h>
|
---|
| 23 | #include <fcntl.h>
|
---|
| 24 | #include <stdio.h>
|
---|
| 25 | #include <stdlib.h>
|
---|
| 26 | #include <unistd.h>
|
---|
| 27 | #include <string.h>
|
---|
| 28 | #include <errno.h>
|
---|
| 29 | #include <sys/param.h>
|
---|
| 30 | #include <sys/stat.h>
|
---|
| 31 | #include "ext2fs/ext2_fs.h"
|
---|
| 32 |
|
---|
| 33 | #ifdef __GNUC__
|
---|
| 34 | # define EXT2FS_ATTR(x) __attribute__(x)
|
---|
| 35 | #else
|
---|
| 36 | # define EXT2FS_ATTR(x)
|
---|
| 37 | #endif
|
---|
| 38 |
|
---|
| 39 | #include "e2fsbb.h"
|
---|
| 40 | #include "e2p/e2p.h"
|
---|
| 41 |
|
---|
| 42 | #define OPT_ADD 1
|
---|
| 43 | #define OPT_REM 2
|
---|
| 44 | #define OPT_SET 4
|
---|
| 45 | #define OPT_SET_VER 8
|
---|
| 46 | static int flags;
|
---|
| 47 | static int recursive;
|
---|
| 48 |
|
---|
| 49 | static unsigned long version;
|
---|
| 50 |
|
---|
| 51 | static unsigned long af;
|
---|
| 52 | static unsigned long rf;
|
---|
| 53 | static unsigned long sf;
|
---|
| 54 |
|
---|
| 55 | #ifdef CONFIG_LFS
|
---|
| 56 | # define LSTAT lstat64
|
---|
| 57 | # define STRUCT_STAT struct stat64
|
---|
| 58 | #else
|
---|
| 59 | # define LSTAT lstat
|
---|
| 60 | # define STRUCT_STAT struct stat
|
---|
| 61 | #endif
|
---|
| 62 |
|
---|
| 63 | struct flags_char {
|
---|
| 64 | unsigned long flag;
|
---|
| 65 | char optchar;
|
---|
| 66 | };
|
---|
| 67 |
|
---|
| 68 | static const struct flags_char flags_array[] = {
|
---|
| 69 | { EXT2_NOATIME_FL, 'A' },
|
---|
| 70 | { EXT2_SYNC_FL, 'S' },
|
---|
| 71 | { EXT2_DIRSYNC_FL, 'D' },
|
---|
| 72 | { EXT2_APPEND_FL, 'a' },
|
---|
| 73 | { EXT2_COMPR_FL, 'c' },
|
---|
| 74 | { EXT2_NODUMP_FL, 'd' },
|
---|
| 75 | { EXT2_IMMUTABLE_FL, 'i' },
|
---|
| 76 | { EXT3_JOURNAL_DATA_FL, 'j' },
|
---|
| 77 | { EXT2_SECRM_FL, 's' },
|
---|
| 78 | { EXT2_UNRM_FL, 'u' },
|
---|
| 79 | { EXT2_NOTAIL_FL, 't' },
|
---|
| 80 | { EXT2_TOPDIR_FL, 'T' },
|
---|
| 81 | { 0, 0 }
|
---|
| 82 | };
|
---|
| 83 |
|
---|
| 84 | static unsigned long get_flag(char c)
|
---|
| 85 | {
|
---|
| 86 | const struct flags_char *fp;
|
---|
| 87 | for (fp = flags_array; fp->flag; fp++)
|
---|
| 88 | if (fp->optchar == c)
|
---|
| 89 | return fp->flag;
|
---|
| 90 | bb_show_usage();
|
---|
| 91 | return 0;
|
---|
| 92 | }
|
---|
| 93 |
|
---|
| 94 | static int decode_arg(char *arg)
|
---|
| 95 | {
|
---|
| 96 | unsigned long *fl;
|
---|
| 97 | char opt = *arg++;
|
---|
| 98 |
|
---|
| 99 | if (opt == '-') {
|
---|
| 100 | flags |= OPT_REM;
|
---|
| 101 | fl = &rf;
|
---|
| 102 | } else if (opt == '+') {
|
---|
| 103 | flags |= OPT_ADD;
|
---|
| 104 | fl = ⁡
|
---|
| 105 | } else if (opt == '=') {
|
---|
| 106 | flags |= OPT_SET;
|
---|
| 107 | fl = &sf;
|
---|
| 108 | } else
|
---|
| 109 | return EOF;
|
---|
| 110 |
|
---|
| 111 | for (; *arg ; ++arg)
|
---|
| 112 | (*fl) |= get_flag(*arg);
|
---|
| 113 |
|
---|
| 114 | return 1;
|
---|
| 115 | }
|
---|
| 116 |
|
---|
| 117 | static int chattr_dir_proc(const char *, struct dirent *, void *);
|
---|
| 118 |
|
---|
| 119 | static void change_attributes(const char * name)
|
---|
| 120 | {
|
---|
| 121 | unsigned long fsflags;
|
---|
| 122 | STRUCT_STAT st;
|
---|
| 123 |
|
---|
| 124 | if (LSTAT(name, &st) == -1) {
|
---|
| 125 | bb_error_msg("stat %s failed", name);
|
---|
| 126 | return;
|
---|
| 127 | }
|
---|
| 128 | if (S_ISLNK(st.st_mode) && recursive)
|
---|
| 129 | return;
|
---|
| 130 |
|
---|
| 131 | /* Don't try to open device files, fifos etc. We probably
|
---|
| 132 | * ought to display an error if the file was explicitly given
|
---|
| 133 | * on the command line (whether or not recursive was
|
---|
| 134 | * requested). */
|
---|
| 135 | if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
|
---|
| 136 | return;
|
---|
| 137 |
|
---|
| 138 | if (flags & OPT_SET_VER)
|
---|
| 139 | if (fsetversion(name, version) == -1)
|
---|
| 140 | bb_error_msg("setting version on %s", name);
|
---|
| 141 |
|
---|
| 142 | if (flags & OPT_SET) {
|
---|
| 143 | fsflags = sf;
|
---|
| 144 | } else {
|
---|
| 145 | if (fgetflags(name, &fsflags) == -1) {
|
---|
| 146 | bb_error_msg("reading flags on %s", name);
|
---|
| 147 | goto skip_setflags;
|
---|
| 148 | }
|
---|
| 149 | if (flags & OPT_REM)
|
---|
| 150 | fsflags &= ~rf;
|
---|
| 151 | if (flags & OPT_ADD)
|
---|
| 152 | fsflags |= af;
|
---|
| 153 | if (!S_ISDIR(st.st_mode))
|
---|
| 154 | fsflags &= ~EXT2_DIRSYNC_FL;
|
---|
| 155 | }
|
---|
| 156 | if (fsetflags(name, fsflags) == -1)
|
---|
| 157 | bb_error_msg("setting flags on %s", name);
|
---|
| 158 |
|
---|
| 159 | skip_setflags:
|
---|
| 160 | if (S_ISDIR(st.st_mode) && recursive)
|
---|
| 161 | iterate_on_dir(name, chattr_dir_proc, NULL);
|
---|
| 162 | }
|
---|
| 163 |
|
---|
| 164 | static int chattr_dir_proc(const char *dir_name, struct dirent *de,
|
---|
| 165 | void *private EXT2FS_ATTR((unused)))
|
---|
| 166 | {
|
---|
| 167 | /*if (strcmp(de->d_name, ".") && strcmp(de->d_name, "..")) {*/
|
---|
| 168 | if (de->d_name[0] == '.' && (de->d_name[1] == '\0' || \
|
---|
| 169 | (de->d_name[1] == '.' && de->d_name[2] == '\0'))) {
|
---|
| 170 | char *path = concat_subpath_file(dir_name, de->d_name);
|
---|
| 171 | if (path) {
|
---|
| 172 | change_attributes(path);
|
---|
| 173 | free(path);
|
---|
| 174 | }
|
---|
| 175 | }
|
---|
| 176 | return 0;
|
---|
| 177 | }
|
---|
| 178 |
|
---|
| 179 | int chattr_main(int argc, char **argv)
|
---|
| 180 | {
|
---|
| 181 | int i;
|
---|
| 182 | char *arg;
|
---|
| 183 |
|
---|
| 184 | /* parse the args */
|
---|
| 185 | for (i = 1; i < argc; ++i) {
|
---|
| 186 | arg = argv[i];
|
---|
| 187 |
|
---|
| 188 | /* take care of -R and -v <version> */
|
---|
| 189 | if (arg[0] == '-') {
|
---|
| 190 | if (arg[1] == 'R' && arg[2] == '\0') {
|
---|
| 191 | recursive = 1;
|
---|
| 192 | continue;
|
---|
| 193 | } else if (arg[1] == 'v' && arg[2] == '\0') {
|
---|
| 194 | char *tmp;
|
---|
| 195 | ++i;
|
---|
| 196 | if (i >= argc)
|
---|
| 197 | bb_show_usage();
|
---|
| 198 | version = strtol(argv[i], &tmp, 0);
|
---|
| 199 | if (*tmp)
|
---|
| 200 | bb_error_msg_and_die("bad version '%s'", arg);
|
---|
| 201 | flags |= OPT_SET_VER;
|
---|
| 202 | continue;
|
---|
| 203 | }
|
---|
| 204 | }
|
---|
| 205 |
|
---|
| 206 | if (decode_arg(arg) == EOF)
|
---|
| 207 | break;
|
---|
| 208 | }
|
---|
| 209 |
|
---|
| 210 | /* run sanity checks on all the arguments given us */
|
---|
| 211 | if (i >= argc)
|
---|
| 212 | bb_show_usage();
|
---|
| 213 | if ((flags & OPT_SET) && ((flags & OPT_ADD) || (flags & OPT_REM)))
|
---|
| 214 | bb_error_msg_and_die("= is incompatible with - and +");
|
---|
| 215 | if ((rf & af) != 0)
|
---|
| 216 | bb_error_msg_and_die("Can't set and unset a flag");
|
---|
| 217 | if (!flags)
|
---|
| 218 | bb_error_msg_and_die("Must use '-v', =, - or +");
|
---|
| 219 |
|
---|
| 220 | /* now run chattr on all the files passed to us */
|
---|
| 221 | while (i < argc)
|
---|
| 222 | change_attributes(argv[i++]);
|
---|
| 223 |
|
---|
| 224 | return EXIT_SUCCESS;
|
---|
| 225 | }
|
---|