1/* vi: set sw=4 ts=4: */ 2/* 3 * Mini chown implementation for busybox 4 * 5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> 6 * 7 * Licensed under GPLv2 or later, see file LICENSE in this source tree. 8 */ 9//config:config CHOWN 10//config: bool "chown (7.6 kb)" 11//config: default y 12//config: help 13//config: chown is used to change the user and/or group ownership 14//config: of files. 15//config: 16//config:config FEATURE_CHOWN_LONG_OPTIONS 17//config: bool "Enable long options" 18//config: default y 19//config: depends on CHOWN && LONG_OPTS 20 21//applet:IF_CHOWN(APPLET_NOEXEC(chown, chown, BB_DIR_BIN, BB_SUID_DROP, chown)) 22 23//kbuild:lib-$(CONFIG_CHOWN) += chown.o 24 25/* BB_AUDIT SUSv3 defects - none? */ 26/* http://www.opengroup.org/onlinepubs/007904975/utilities/chown.html */ 27 28//usage:#define chown_trivial_usage 29//usage: "[-Rh"IF_DESKTOP("LHPcvf")"]... USER[:[GRP]] FILE..." 30//usage:#define chown_full_usage "\n\n" 31//usage: "Change the owner and/or group of each FILE to USER and/or GRP\n" 32//usage: "\n -R Recurse" 33//usage: "\n -h Affect symlinks instead of symlink targets" 34//usage: IF_DESKTOP( 35//usage: "\n -L Traverse all symlinks to directories" 36//usage: "\n -H Traverse symlinks on command line only" 37//usage: "\n -P Don't traverse symlinks (default)" 38//usage: "\n -c List changed files" 39//usage: "\n -v List all files" 40//usage: "\n -f Hide errors" 41//usage: ) 42//usage: 43//usage:#define chown_example_usage 44//usage: "$ ls -l /tmp/foo\n" 45//usage: "-r--r--r-- 1 andersen andersen 0 Apr 12 18:25 /tmp/foo\n" 46//usage: "$ chown root /tmp/foo\n" 47//usage: "$ ls -l /tmp/foo\n" 48//usage: "-r--r--r-- 1 root andersen 0 Apr 12 18:25 /tmp/foo\n" 49//usage: "$ chown root.root /tmp/foo\n" 50//usage: "ls -l /tmp/foo\n" 51//usage: "-r--r--r-- 1 root root 0 Apr 12 18:25 /tmp/foo\n" 52 53#include "libbb.h" 54 55/* This is a NOEXEC applet. Be very careful! */ 56 57 58#define OPT_STR "Rh" IF_DESKTOP("vcfLHP") 59#define BIT_RECURSE 1 60#define OPT_RECURSE (opt & 1) 61#define OPT_NODEREF (opt & 2) 62#define OPT_VERBOSE (IF_DESKTOP(opt & 0x04) IF_NOT_DESKTOP(0)) 63#define OPT_CHANGED (IF_DESKTOP(opt & 0x08) IF_NOT_DESKTOP(0)) 64#define OPT_QUIET (IF_DESKTOP(opt & 0x10) IF_NOT_DESKTOP(0)) 65/* POSIX options 66 * -L traverse every symbolic link to a directory encountered 67 * -H if a command line argument is a symbolic link to a directory, traverse it 68 * -P do not traverse any symbolic links (default) 69 * We do not conform to the following: 70 * "Specifying more than one of -H, -L, and -P is not an error. 71 * The last option specified shall determine the behavior of the utility." */ 72/* -L */ 73#define BIT_TRAVERSE 0x20 74#define OPT_TRAVERSE (IF_DESKTOP(opt & BIT_TRAVERSE) IF_NOT_DESKTOP(0)) 75/* -H or -L */ 76#define BIT_TRAVERSE_TOP (0x20|0x40) 77#define OPT_TRAVERSE_TOP (IF_DESKTOP(opt & BIT_TRAVERSE_TOP) IF_NOT_DESKTOP(0)) 78 79#if ENABLE_FEATURE_CHOWN_LONG_OPTIONS 80static const char chown_longopts[] ALIGN1 = 81 "recursive\0" No_argument "R" 82 "dereference\0" No_argument "\xff" 83 "no-dereference\0" No_argument "h" 84# if ENABLE_DESKTOP 85 "changes\0" No_argument "c" 86 "silent\0" No_argument "f" 87 "quiet\0" No_argument "f" 88 "verbose\0" No_argument "v" 89# endif 90 ; 91#endif 92 93typedef int (*chown_fptr)(const char *, uid_t, gid_t); 94 95struct param_t { 96 struct bb_uidgid_t ugid; 97 chown_fptr chown_func; 98}; 99 100static int FAST_FUNC fileAction(const char *fileName, struct stat *statbuf, 101 void *vparam, int depth UNUSED_PARAM) 102{ 103#define param (*(struct param_t*)vparam) 104#define opt option_mask32 105 uid_t u = (param.ugid.uid == (uid_t)-1L) ? statbuf->st_uid : param.ugid.uid; 106 gid_t g = (param.ugid.gid == (gid_t)-1L) ? statbuf->st_gid : param.ugid.gid; 107 108 if (param.chown_func(fileName, u, g) == 0) { 109 if (OPT_VERBOSE 110 || (OPT_CHANGED && (statbuf->st_uid != u || statbuf->st_gid != g)) 111 ) { 112 printf("changed ownership of '%s' to %u:%u\n", 113 fileName, (unsigned)u, (unsigned)g); 114 } 115 return TRUE; 116 } 117 if (!OPT_QUIET) 118 bb_simple_perror_msg(fileName); 119 return FALSE; 120#undef opt 121#undef param 122} 123 124int chown_main(int argc UNUSED_PARAM, char **argv) 125{ 126 int retval = EXIT_SUCCESS; 127 int opt, flags; 128 struct param_t param; 129 130#if ENABLE_FEATURE_CHOWN_LONG_OPTIONS 131 opt = getopt32long(argv, "^" OPT_STR "\0" "-2", chown_longopts); 132#else 133 opt = getopt32(argv, "^" OPT_STR "\0" "-2"); 134#endif 135 argv += optind; 136 137 /* This matches coreutils behavior (almost - see below) */ 138 param.chown_func = chown; 139 if (OPT_NODEREF 140 /* || (OPT_RECURSE && !OPT_TRAVERSE_TOP): */ 141 IF_DESKTOP( || (opt & (BIT_RECURSE|BIT_TRAVERSE_TOP)) == BIT_RECURSE) 142 ) { 143 param.chown_func = lchown; 144 } 145 146 flags = ACTION_DEPTHFIRST; /* match coreutils order */ 147 if (OPT_RECURSE) 148 flags |= ACTION_RECURSE; 149 if (OPT_TRAVERSE_TOP) 150 flags |= ACTION_FOLLOWLINKS_L0; /* -H/-L: follow links on depth 0 */ 151 if (OPT_TRAVERSE) 152 flags |= ACTION_FOLLOWLINKS; /* follow links if -L */ 153 154 parse_chown_usergroup_or_die(¶m.ugid, argv[0]); 155 156 /* Ok, ready to do the deed now */ 157 while (*++argv) { 158 if (!recursive_action(*argv, 159 flags, /* flags */ 160 fileAction, /* file action */ 161 fileAction, /* dir action */ 162 ¶m, /* user data */ 163 0) /* depth */ 164 ) { 165 retval = EXIT_FAILURE; 166 } 167 } 168 169 return retval; 170} 171 172/* 173Testcase. Run in empty directory. 174 175#!/bin/sh 176t1="/tmp/busybox chown" 177t2="/usr/bin/chown" 178create() { 179 rm -rf $1; mkdir $1 180 ( 181 cd $1 || exit 1 182 mkdir dir dir2 183 >up 184 >file 185 >dir/file 186 >dir2/file 187 ln -s dir linkdir 188 ln -s file linkfile 189 ln -s ../up dir/linkup 190 ln -s ../dir2 dir/linkupdir2 191 ) 192 chown -R 0:0 $1 193} 194tst() { 195 create test1 196 create test2 197 echo "[$1]" >>test1.out 198 echo "[$1]" >>test2.out 199 (cd test1; $t1 $1) >>test1.out 2>&1 200 (cd test2; $t2 $1) >>test2.out 2>&1 201 (cd test1; ls -lnR) >out1 202 (cd test2; ls -lnR) >out2 203 echo "chown $1" >out.diff 204 if ! diff -u out1 out2 >>out.diff; then exit 1; fi 205 rm out.diff 206} 207tst_for_each() { 208 tst "$1 1:1 file" 209 tst "$1 1:1 dir" 210 tst "$1 1:1 linkdir" 211 tst "$1 1:1 linkfile" 212} 213echo "If script produced 'out.diff' file, then at least one testcase failed" 214>test1.out 215>test2.out 216# These match coreutils 6.8: 217tst_for_each "-v" 218tst_for_each "-vR" 219tst_for_each "-vRP" 220tst_for_each "-vRL" 221tst_for_each "-vRH" 222tst_for_each "-vh" 223tst_for_each "-vhR" 224tst_for_each "-vhRP" 225tst_for_each "-vhRL" 226tst_for_each "-vhRH" 227# Fix `name' in coreutils output 228sed 's/`/'"'"'/g' -i test2.out 229# Compare us with coreutils output 230diff -u test1.out test2.out 231 232*/ 233