1 | /*
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2 | * chattr.c - Change file attributes on an ext2 file system
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3 | *
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4 | * Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr>
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5 | * Laboratoire MASI, Institut Blaise Pascal
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6 | * Universite Pierre et Marie Curie (Paris VI)
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7 | *
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8 | * This file can be redistributed under the terms of the GNU General
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9 | * Public License
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10 | */
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11 |
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12 | /*
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13 | * History:
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14 | * 93/10/30 - Creation
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15 | * 93/11/13 - Replace stat() calls by lstat() to avoid loops
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16 | * 94/02/27 - Integrated in Ted's distribution
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17 | * 98/12/29 - Ignore symlinks when working recursively (G M Sipe)
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18 | * 98/12/29 - Display version info only when -V specified (G M Sipe)
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19 | */
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20 |
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21 | #include <sys/types.h>
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22 | #include <dirent.h>
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23 | #include <fcntl.h>
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24 | #include <stdio.h>
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25 | #include <stdlib.h>
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26 | #include <unistd.h>
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27 | #include <string.h>
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28 | #include <errno.h>
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29 | #include <sys/param.h>
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30 | #include <sys/stat.h>
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31 | #include "ext2fs/ext2_fs.h"
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32 |
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33 | #ifdef __GNUC__
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34 | # define EXT2FS_ATTR(x) __attribute__(x)
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35 | #else
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36 | # define EXT2FS_ATTR(x)
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37 | #endif
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38 |
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39 | #include "e2fsbb.h"
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40 | #include "e2p/e2p.h"
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41 |
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42 | #define OPT_ADD 1
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43 | #define OPT_REM 2
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44 | #define OPT_SET 4
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45 | #define OPT_SET_VER 8
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46 | static int flags;
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47 | static int recursive;
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48 |
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49 | static unsigned long version;
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50 |
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51 | static unsigned long af;
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52 | static unsigned long rf;
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53 | static unsigned long sf;
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54 |
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55 | #ifdef CONFIG_LFS
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56 | # define LSTAT lstat64
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57 | # define STRUCT_STAT struct stat64
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58 | #else
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59 | # define LSTAT lstat
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60 | # define STRUCT_STAT struct stat
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61 | #endif
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62 |
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63 | struct flags_char {
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64 | unsigned long flag;
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65 | char optchar;
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66 | };
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67 |
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68 | static const struct flags_char flags_array[] = {
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69 | { EXT2_NOATIME_FL, 'A' },
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70 | { EXT2_SYNC_FL, 'S' },
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71 | { EXT2_DIRSYNC_FL, 'D' },
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72 | { EXT2_APPEND_FL, 'a' },
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73 | { EXT2_COMPR_FL, 'c' },
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74 | { EXT2_NODUMP_FL, 'd' },
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75 | { EXT2_IMMUTABLE_FL, 'i' },
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76 | { EXT3_JOURNAL_DATA_FL, 'j' },
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77 | { EXT2_SECRM_FL, 's' },
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78 | { EXT2_UNRM_FL, 'u' },
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79 | { EXT2_NOTAIL_FL, 't' },
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80 | { EXT2_TOPDIR_FL, 'T' },
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81 | { 0, 0 }
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82 | };
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83 |
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84 | static unsigned long get_flag(char c)
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85 | {
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86 | const struct flags_char *fp;
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87 | for (fp = flags_array; fp->flag; fp++)
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88 | if (fp->optchar == c)
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89 | return fp->flag;
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90 | bb_show_usage();
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91 | return 0;
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92 | }
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93 |
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94 | static int decode_arg(char *arg)
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95 | {
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96 | unsigned long *fl;
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97 | char opt = *arg++;
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98 |
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99 | if (opt == '-') {
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100 | flags |= OPT_REM;
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101 | fl = &rf;
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102 | } else if (opt == '+') {
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103 | flags |= OPT_ADD;
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104 | fl = ⁡
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105 | } else if (opt == '=') {
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106 | flags |= OPT_SET;
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107 | fl = &sf;
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108 | } else
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109 | return EOF;
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110 |
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111 | for (; *arg ; ++arg)
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112 | (*fl) |= get_flag(*arg);
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113 |
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114 | return 1;
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115 | }
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116 |
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117 | static int chattr_dir_proc(const char *, struct dirent *, void *);
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118 |
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119 | static void change_attributes(const char * name)
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120 | {
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121 | unsigned long fsflags;
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122 | STRUCT_STAT st;
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123 |
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124 | if (LSTAT(name, &st) == -1) {
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125 | bb_error_msg("stat %s failed", name);
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126 | return;
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127 | }
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128 | if (S_ISLNK(st.st_mode) && recursive)
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129 | return;
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130 |
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131 | /* Don't try to open device files, fifos etc. We probably
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132 | * ought to display an error if the file was explicitly given
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133 | * on the command line (whether or not recursive was
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134 | * requested). */
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135 | if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
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136 | return;
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137 |
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138 | if (flags & OPT_SET_VER)
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139 | if (fsetversion(name, version) == -1)
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140 | bb_error_msg("setting version on %s", name);
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141 |
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142 | if (flags & OPT_SET) {
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143 | fsflags = sf;
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144 | } else {
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145 | if (fgetflags(name, &fsflags) == -1) {
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146 | bb_error_msg("reading flags on %s", name);
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147 | goto skip_setflags;
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148 | }
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149 | if (flags & OPT_REM)
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150 | fsflags &= ~rf;
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151 | if (flags & OPT_ADD)
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152 | fsflags |= af;
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153 | if (!S_ISDIR(st.st_mode))
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154 | fsflags &= ~EXT2_DIRSYNC_FL;
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155 | }
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156 | if (fsetflags(name, fsflags) == -1)
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157 | bb_error_msg("setting flags on %s", name);
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158 |
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159 | skip_setflags:
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160 | if (S_ISDIR(st.st_mode) && recursive)
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161 | iterate_on_dir(name, chattr_dir_proc, NULL);
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162 | }
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163 |
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164 | static int chattr_dir_proc(const char *dir_name, struct dirent *de,
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165 | void *private EXT2FS_ATTR((unused)))
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166 | {
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167 | /*if (strcmp(de->d_name, ".") && strcmp(de->d_name, "..")) {*/
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168 | if (de->d_name[0] == '.' && (de->d_name[1] == '\0' || \
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169 | (de->d_name[1] == '.' && de->d_name[2] == '\0'))) {
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170 | char *path = concat_subpath_file(dir_name, de->d_name);
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171 | if (path) {
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172 | change_attributes(path);
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173 | free(path);
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174 | }
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175 | }
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176 | return 0;
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177 | }
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178 |
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179 | int chattr_main(int argc, char **argv)
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180 | {
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181 | int i;
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182 | char *arg;
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183 |
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184 | /* parse the args */
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185 | for (i = 1; i < argc; ++i) {
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186 | arg = argv[i];
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187 |
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188 | /* take care of -R and -v <version> */
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189 | if (arg[0] == '-') {
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190 | if (arg[1] == 'R' && arg[2] == '\0') {
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191 | recursive = 1;
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192 | continue;
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193 | } else if (arg[1] == 'v' && arg[2] == '\0') {
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194 | char *tmp;
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195 | ++i;
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196 | if (i >= argc)
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197 | bb_show_usage();
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198 | version = strtol(argv[i], &tmp, 0);
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199 | if (*tmp)
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200 | bb_error_msg_and_die("bad version '%s'", arg);
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201 | flags |= OPT_SET_VER;
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202 | continue;
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203 | }
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204 | }
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205 |
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206 | if (decode_arg(arg) == EOF)
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207 | break;
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208 | }
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209 |
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210 | /* run sanity checks on all the arguments given us */
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211 | if (i >= argc)
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212 | bb_show_usage();
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213 | if ((flags & OPT_SET) && ((flags & OPT_ADD) || (flags & OPT_REM)))
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214 | bb_error_msg_and_die("= is incompatible with - and +");
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215 | if ((rf & af) != 0)
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216 | bb_error_msg_and_die("Can't set and unset a flag");
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217 | if (!flags)
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218 | bb_error_msg_and_die("Must use '-v', =, - or +");
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219 |
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220 | /* now run chattr on all the files passed to us */
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221 | while (i < argc)
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222 | change_attributes(argv[i++]);
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223 |
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224 | return EXIT_SUCCESS;
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225 | }
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