[1765] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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| 3 | * chattr.c - Change file attributes on an ext2 file system
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| 4 | *
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| 5 | * Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr>
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| 6 | * Laboratoire MASI, Institut Blaise Pascal
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| 7 | * Universite Pierre et Marie Curie (Paris VI)
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| 8 | *
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| 9 | * This file can be redistributed under the terms of the GNU General
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| 10 | * Public License
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| 11 | */
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[3621] | 12 | //config:config CHATTR
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| 13 | //config: bool "chattr"
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| 14 | //config: default y
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| 15 | //config: help
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| 16 | //config: chattr changes the file attributes on a second extended file system.
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[821] | 17 |
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[3621] | 18 | //applet:IF_CHATTR(APPLET(chattr, BB_DIR_BIN, BB_SUID_DROP))
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[821] | 19 |
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[3621] | 20 | //kbuild:lib-$(CONFIG_CHATTR) += chattr.o e2fs_lib.o
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| 21 |
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[3232] | 22 | //usage:#define chattr_trivial_usage
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| 23 | //usage: "[-R] [-+=AacDdijsStTu] [-v VERSION] [FILE]..."
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| 24 | //usage:#define chattr_full_usage "\n\n"
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[3621] | 25 | //usage: "Change ext2 file attributes\n"
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[3232] | 26 | //usage: "\nModifiers:"
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[3621] | 27 | //usage: "\n -,+,= Remove/add/set attributes"
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[3232] | 28 | //usage: "\nAttributes:"
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| 29 | //usage: "\n A Don't track atime"
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| 30 | //usage: "\n a Append mode only"
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| 31 | //usage: "\n c Enable compress"
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| 32 | //usage: "\n D Write dir contents synchronously"
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| 33 | //usage: "\n d Don't backup with dump"
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| 34 | //usage: "\n i Cannot be modified (immutable)"
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| 35 | //usage: "\n j Write all data to journal first"
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| 36 | //usage: "\n s Zero disk storage when deleted"
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[3621] | 37 | //usage: "\n S Write synchronously"
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[3232] | 38 | //usage: "\n t Disable tail-merging of partial blocks with other files"
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| 39 | //usage: "\n u Allow file to be undeleted"
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| 40 | //usage: "\n -R Recurse"
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[3621] | 41 | //usage: "\n -v VER Set version/generation number"
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[3232] | 42 |
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[1765] | 43 | #include "libbb.h"
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| 44 | #include "e2fs_lib.h"
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[821] | 45 |
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| 46 | #define OPT_ADD 1
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| 47 | #define OPT_REM 2
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| 48 | #define OPT_SET 4
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| 49 | #define OPT_SET_VER 8
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| 50 |
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[1765] | 51 | struct globals {
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| 52 | unsigned long version;
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| 53 | unsigned long af;
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| 54 | unsigned long rf;
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| 55 | smallint flags;
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| 56 | smallint recursive;
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[821] | 57 | };
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| 58 |
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| 59 | static unsigned long get_flag(char c)
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| 60 | {
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[2725] | 61 | const char *fp = strchr(e2attr_flags_sname_chattr, c);
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| 62 | if (fp)
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| 63 | return e2attr_flags_value_chattr[fp - e2attr_flags_sname_chattr];
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[821] | 64 | bb_show_usage();
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| 65 | }
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| 66 |
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[1765] | 67 | static int decode_arg(const char *arg, struct globals *gp)
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[821] | 68 | {
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| 69 | unsigned long *fl;
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| 70 | char opt = *arg++;
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| 71 |
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[1765] | 72 | fl = &gp->af;
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[821] | 73 | if (opt == '-') {
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[1765] | 74 | gp->flags |= OPT_REM;
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| 75 | fl = &gp->rf;
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[821] | 76 | } else if (opt == '+') {
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[1765] | 77 | gp->flags |= OPT_ADD;
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[821] | 78 | } else if (opt == '=') {
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[1765] | 79 | gp->flags |= OPT_SET;
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[821] | 80 | } else
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[1765] | 81 | return 0;
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[821] | 82 |
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[1765] | 83 | while (*arg)
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| 84 | *fl |= get_flag(*arg++);
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[821] | 85 |
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| 86 | return 1;
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| 87 | }
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| 88 |
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[1765] | 89 | static void change_attributes(const char *name, struct globals *gp);
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[821] | 90 |
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[2725] | 91 | static int FAST_FUNC chattr_dir_proc(const char *dir_name, struct dirent *de, void *gp)
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[821] | 92 | {
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[1765] | 93 | char *path = concat_subpath_file(dir_name, de->d_name);
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| 94 | /* path is NULL if de->d_name is "." or "..", else... */
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| 95 | if (path) {
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| 96 | change_attributes(path, gp);
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| 97 | free(path);
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| 98 | }
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| 99 | return 0;
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| 100 | }
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| 101 |
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| 102 | static void change_attributes(const char *name, struct globals *gp)
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| 103 | {
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[821] | 104 | unsigned long fsflags;
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[1765] | 105 | struct stat st;
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[821] | 106 |
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[1765] | 107 | if (lstat(name, &st) != 0) {
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| 108 | bb_perror_msg("stat %s", name);
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[821] | 109 | return;
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| 110 | }
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[1765] | 111 | if (S_ISLNK(st.st_mode) && gp->recursive)
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[821] | 112 | return;
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| 113 |
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| 114 | /* Don't try to open device files, fifos etc. We probably
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| 115 | * ought to display an error if the file was explicitly given
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| 116 | * on the command line (whether or not recursive was
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| 117 | * requested). */
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| 118 | if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
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| 119 | return;
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| 120 |
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[1765] | 121 | if (gp->flags & OPT_SET_VER)
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| 122 | if (fsetversion(name, gp->version) != 0)
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| 123 | bb_perror_msg("setting version on %s", name);
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[821] | 124 |
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[1765] | 125 | if (gp->flags & OPT_SET) {
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| 126 | fsflags = gp->af;
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[821] | 127 | } else {
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[1765] | 128 | if (fgetflags(name, &fsflags) != 0) {
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| 129 | bb_perror_msg("reading flags on %s", name);
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[821] | 130 | goto skip_setflags;
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| 131 | }
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[1765] | 132 | /*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */
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| 133 | fsflags &= ~gp->rf;
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| 134 | /*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */
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| 135 | fsflags |= gp->af;
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| 136 | /* What is this? And why it's not done for SET case? */
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[821] | 137 | if (!S_ISDIR(st.st_mode))
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| 138 | fsflags &= ~EXT2_DIRSYNC_FL;
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| 139 | }
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[1765] | 140 | if (fsetflags(name, fsflags) != 0)
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| 141 | bb_perror_msg("setting flags on %s", name);
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[821] | 142 |
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[1765] | 143 | skip_setflags:
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| 144 | if (gp->recursive && S_ISDIR(st.st_mode))
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| 145 | iterate_on_dir(name, chattr_dir_proc, gp);
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[821] | 146 | }
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| 147 |
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[2725] | 148 | int chattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 149 | int chattr_main(int argc UNUSED_PARAM, char **argv)
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[821] | 150 | {
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[1765] | 151 | struct globals g;
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[821] | 152 | char *arg;
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| 153 |
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[1765] | 154 | memset(&g, 0, sizeof(g));
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| 155 |
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[821] | 156 | /* parse the args */
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[1765] | 157 | while ((arg = *++argv)) {
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[821] | 158 | /* take care of -R and -v <version> */
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[1765] | 159 | if (arg[0] == '-'
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| 160 | && (arg[1] == 'R' || arg[1] == 'v')
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| 161 | && !arg[2]
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| 162 | ) {
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| 163 | if (arg[1] == 'R') {
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| 164 | g.recursive = 1;
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[821] | 165 | continue;
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| 166 | }
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[1765] | 167 | /* arg[1] == 'v' */
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| 168 | if (!*++argv)
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| 169 | bb_show_usage();
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| 170 | g.version = xatoul(*argv);
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| 171 | g.flags |= OPT_SET_VER;
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| 172 | continue;
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[821] | 173 | }
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| 174 |
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[1765] | 175 | if (!decode_arg(arg, &g))
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[821] | 176 | break;
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| 177 | }
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| 178 |
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| 179 | /* run sanity checks on all the arguments given us */
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[1765] | 180 | if (!*argv)
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[821] | 181 | bb_show_usage();
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[1765] | 182 | if ((g.flags & OPT_SET) && (g.flags & (OPT_ADD|OPT_REM)))
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[821] | 183 | bb_error_msg_and_die("= is incompatible with - and +");
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[1765] | 184 | if (g.rf & g.af)
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| 185 | bb_error_msg_and_die("can't set and unset a flag");
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| 186 | if (!g.flags)
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| 187 | bb_error_msg_and_die("must use '-v', =, - or +");
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[821] | 188 |
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| 189 | /* now run chattr on all the files passed to us */
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[1765] | 190 | do change_attributes(*argv, &g); while (*++argv);
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[821] | 191 |
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| 192 | return EXIT_SUCCESS;
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| 193 | }
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