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authorDenis Vlasenko2006-10-27 23:42:25 +0000
committerDenis Vlasenko2006-10-27 23:42:25 +0000
commit8c35d65c43216bb840326ac7476a180e2ae36fe9 (patch)
tree13d20b31e817dcff5124498ca0bec2cdf9781014 /coreutils/chmod.c
parente80e2a3660bf09cc549cb2dfd2bdeb77ccde1231 (diff)
downloadbusybox-8c35d65c43216bb840326ac7476a180e2ae36fe9.zip
busybox-8c35d65c43216bb840326ac7476a180e2ae36fe9.tar.gz
recursive_action: add depth param
chmod: match coreutils versus following links
Diffstat (limited to 'coreutils/chmod.c')
-rw-r--r--coreutils/chmod.c98
1 files changed, 76 insertions, 22 deletions
diff --git a/coreutils/chmod.c b/coreutils/chmod.c
index c4f8fa0..b601504 100644
--- a/coreutils/chmod.c
+++ b/coreutils/chmod.c
@@ -20,9 +20,9 @@
#define OPT_VERBOSE (USE_DESKTOP(option_mask32 & 2) SKIP_DESKTOP(0))
#define OPT_CHANGED (USE_DESKTOP(option_mask32 & 4) SKIP_DESKTOP(0))
#define OPT_QUIET (USE_DESKTOP(option_mask32 & 8) SKIP_DESKTOP(0))
-#define OPT_STR ("-R" USE_DESKTOP("vcf"))
+#define OPT_STR "R" USE_DESKTOP("vcf")
-/* TODO:
+/* coreutils:
* chmod never changes the permissions of symbolic links; the chmod
* system call cannot change their permissions. This is not a problem
* since the permissions of symbolic links are never used.
@@ -31,19 +31,26 @@
* symbolic links encountered during recursive directory traversals.
*/
-static int fileAction(const char *fileName, struct stat *statbuf, void* junk)
+static int fileAction(const char *fileName, struct stat *statbuf, void* junk, int depth)
{
- mode_t newmode = statbuf->st_mode;
+ mode_t newmode;
- // TODO: match GNU behavior:
- // if (depth > 0 && S_ISLNK(statbuf->st_mode)) return TRUE;
- // if (depth == 0) follow link
+ /* match coreutils behavior */
+ if (depth == 0) {
+ /* statbuf holds lstat result, but we need stat (follow link) */
+ if (stat(fileName, statbuf))
+ goto err;
+ } else { /* depth > 0: skip links */
+ if (S_ISLNK(statbuf->st_mode))
+ return TRUE;
+ }
+ newmode = statbuf->st_mode;
if (!bb_parse_mode((char *)junk, &newmode))
bb_error_msg_and_die("invalid mode: %s", (char *)junk);
- if (chmod(fileName, statbuf->st_mode) == 0) {
- if (OPT_VERBOSE /* -v verbose? or -c changed? */
+ if (chmod(fileName, newmode) == 0) {
+ if (OPT_VERBOSE
|| (OPT_CHANGED && statbuf->st_mode != newmode)
) {
printf("mode of '%s' changed to %04o (%s)\n", fileName,
@@ -51,7 +58,8 @@ static int fileAction(const char *fileName, struct stat *statbuf, void* junk)
}
return TRUE;
}
- if (!OPT_QUIET) /* not silent (-f)? */
+ err:
+ if (!OPT_QUIET)
bb_perror_msg("%s", fileName);
return FALSE;
}
@@ -62,30 +70,33 @@ int chmod_main(int argc, char **argv)
char *arg, **argp;
char *smode;
- /* Convert first encountered -r into a-r, -w into a-w etc */
- argp = argv + 1;
- while ((arg = *argp)) {
+ /* Convert first encountered -r into ar, -w into aw etc
+ * so that getopt would not eat it */
+ argp = argv;
+ while ((arg = *++argp)) {
/* Mode spec must be the first arg (sans -R etc) */
/* (protect against mishandling e.g. "chmod 644 -r") */
- if (arg[0] != '-')
+ if (arg[0] != '-') {
+ arg = NULL;
break;
+ }
/* An option. Not a -- or valid option? */
- if (arg[1] && !strchr(OPT_STR, arg[1])) {
- argp[0] = xasprintf("a%s", arg);
+ if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
+ arg[0] = 'a';
break;
}
- argp++;
}
- /* "chmod -rzzz abc" will say "invalid mode: a-rzzz"!
- * It is easily fixable, but deemed not worth the code */
+ /* Paerse options */
opt_complementary = "-2";
- getopt32(argc, argv, OPT_STR + 1); /* Reuse string */
+ getopt32(argc, argv, ("-"OPT_STR) + 1); /* Reuse string */
argv += optind;
- smode = *argv++;
+ /* Restore option-like mode if needed */
+ if (arg) arg[0] = '-';
/* Ok, ready to do the deed now */
+ smode = *argv++;
do {
if (!recursive_action(*argv,
OPT_RECURSE, // recurse
@@ -93,7 +104,8 @@ int chmod_main(int argc, char **argv)
FALSE, // depth first
fileAction, // file action
fileAction, // dir action
- smode) // user data
+ smode, // user data
+ 0) // depth
) {
retval = EXIT_FAILURE;
}
@@ -101,3 +113,45 @@ int chmod_main(int argc, char **argv)
return retval;
}
+
+/*
+Security: chmod is too important and too subtle.
+This is a test script (busybox chmod versus coreutils).
+Run it in empty dir. Probably requires bash.
+
+#!/bin/sh
+function create() {
+ rm -rf $1; mkdir $1
+ (
+ cd $1 || exit 1
+ mkdir dir
+ >up
+ >file
+ >dir/file
+ ln -s dir linkdir
+ ln -s file linkfile
+ ln -s ../up dir/up
+ )
+}
+function test() {
+ (cd test1; $t1 $1)
+ (cd test2; $t2 $1)
+ (cd test1; ls -lR) >out1
+ (cd test2; ls -lR) >out2
+ echo "chmod $1" >out.diff
+ if ! diff -u out1 out2 >>out.diff; then exit 1; fi
+ mv out.diff out1.diff
+}
+t1="/tmp/busybox chmod"
+t2="/usr/bin/chmod"
+create test1; create test2
+test "a+w file"
+test "a-w dir"
+test "a+w linkfile"
+test "a-w linkdir"
+test "-R a+w file"
+test "-R a-w dir"
+test "-R a+w linkfile"
+test "-R a-w linkdir"
+test "a-r,a+x linkfile"
+*/