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-rw-r--r--gnulib-tests/test-linkat.c383
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diff --git a/gnulib-tests/test-linkat.c b/gnulib-tests/test-linkat.c
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+/* Tests of linkat.
+ Copyright (C) 2009-2020 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Eric Blake <ebb9@byu.net>, 2009. */
+
+#include <config.h>
+
+#include <unistd.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (linkat, int, (int, char const *, int, char const *, int));
+
+#include <fcntl.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include "areadlink.h"
+#include "filenamecat.h"
+#include "same-inode.h"
+#include "ignore-value.h"
+#include "macros.h"
+
+#define BASE "test-linkat.t"
+
+#include "test-link.h"
+
+static int dfd1 = AT_FDCWD;
+static int dfd2 = AT_FDCWD;
+static int flag = AT_SYMLINK_FOLLOW;
+
+/* Wrapper to test linkat like link. */
+static int
+do_link (char const *name1, char const *name2)
+{
+ return linkat (dfd1, name1, dfd2, name2, flag);
+}
+
+/* Can we expect that link() and linkat(), when called on a symlink,
+ increment the link count of that symlink? */
+#if LINK_FOLLOWS_SYMLINKS == 0
+# define EXPECT_LINK_HARDLINKS_SYMLINKS 1
+#elif LINK_FOLLOWS_SYMLINKS == -1
+extern int __xpg4;
+# define EXPECT_LINK_HARDLINKS_SYMLINKS (__xpg4 == 0)
+#else
+# define EXPECT_LINK_HARDLINKS_SYMLINKS 0
+#endif
+
+/* Wrapper to see if two symlinks act the same. */
+static void
+check_same_link (char const *name1, char const *name2)
+{
+ struct stat st1;
+ struct stat st2;
+ char *contents1;
+ char *contents2;
+ ASSERT (lstat (name1, &st1) == 0);
+ ASSERT (lstat (name2, &st2) == 0);
+ contents1 = areadlink_with_size (name1, st1.st_size);
+ contents2 = areadlink_with_size (name2, st2.st_size);
+ ASSERT (contents1);
+ ASSERT (contents2);
+ ASSERT (strcmp (contents1, contents2) == 0);
+ if (EXPECT_LINK_HARDLINKS_SYMLINKS)
+ ASSERT (SAME_INODE (st1, st2));
+ free (contents1);
+ free (contents2);
+}
+
+int
+main (void)
+{
+ int i;
+ int dfd;
+ char *cwd;
+ int result;
+
+ /* Clean up any trash from prior testsuite runs. */
+ ignore_value (system ("rm -rf " BASE "*"));
+
+ /* Test behaviour for invalid file descriptors. */
+ {
+ errno = 0;
+ ASSERT (linkat (-1, "foo", AT_FDCWD, "bar", 0) == -1);
+ ASSERT (errno == EBADF);
+ }
+ {
+ close (99);
+ errno = 0;
+ ASSERT (linkat (99, "foo", AT_FDCWD, "bar", 0) == -1);
+ ASSERT (errno == EBADF);
+ }
+ ASSERT (close (creat (BASE "oo", 0600)) == 0);
+ {
+ errno = 0;
+ ASSERT (linkat (AT_FDCWD, BASE "oo", -1, "bar", 0) == -1);
+ ASSERT (errno == EBADF);
+ }
+ {
+ errno = 0;
+ ASSERT (linkat (AT_FDCWD, BASE "oo", 99, "bar", 0) == -1);
+ ASSERT (errno == EBADF);
+ }
+ ASSERT (unlink (BASE "oo") == 0);
+
+ /* Test basic link functionality, without mentioning symlinks. */
+ result = test_link (do_link, true);
+ dfd1 = open (".", O_RDONLY);
+ ASSERT (0 <= dfd1);
+ ASSERT (test_link (do_link, false) == result);
+ dfd2 = dfd1;
+ ASSERT (test_link (do_link, false) == result);
+ dfd1 = AT_FDCWD;
+ ASSERT (test_link (do_link, false) == result);
+ flag = 0;
+ ASSERT (test_link (do_link, false) == result);
+ dfd1 = dfd2;
+ ASSERT (test_link (do_link, false) == result);
+ dfd2 = AT_FDCWD;
+ ASSERT (test_link (do_link, false) == result);
+ ASSERT (close (dfd1) == 0);
+ dfd1 = AT_FDCWD;
+ ASSERT (test_link (do_link, false) == result);
+
+ /* Create locations to manipulate. */
+ ASSERT (mkdir (BASE "sub1", 0700) == 0);
+ ASSERT (mkdir (BASE "sub2", 0700) == 0);
+ ASSERT (close (creat (BASE "00", 0600)) == 0);
+ cwd = getcwd (NULL, 0);
+ ASSERT (cwd);
+
+ dfd = open (BASE "sub1", O_RDONLY);
+ ASSERT (0 <= dfd);
+ ASSERT (chdir (BASE "sub2") == 0);
+
+ /* There are 16 possible scenarios, based on whether an fd is
+ AT_FDCWD or real, whether a file is absolute or relative, coupled
+ with whether flag is set for 32 iterations.
+
+ To ensure that we test all of the code paths (rather than
+ triggering early normalization optimizations), we use a loop to
+ repeatedly rename a file in the parent directory, use an fd open
+ on subdirectory 1, all while executing in subdirectory 2; all
+ relative names are thus given with a leading "../". Finally, the
+ last scenario (two relative paths given, neither one AT_FDCWD)
+ has two paths, based on whether the two fds are equivalent, so we
+ do the other variant after the loop. */
+ for (i = 0; i < 32; i++)
+ {
+ int fd1 = (i & 8) ? dfd : AT_FDCWD;
+ char *file1 = mfile_name_concat ((i & 4) ? ".." : cwd, BASE "xx", NULL);
+ int fd2 = (i & 2) ? dfd : AT_FDCWD;
+ char *file2 = mfile_name_concat ((i & 1) ? ".." : cwd, BASE "xx", NULL);
+ ASSERT (file1);
+ ASSERT (file2);
+ flag = (i & 0x10 ? AT_SYMLINK_FOLLOW : 0);
+
+ ASSERT (sprintf (strchr (file1, '\0') - 2, "%02d", i) == 2);
+ ASSERT (sprintf (strchr (file2, '\0') - 2, "%02d", i + 1) == 2);
+ ASSERT (linkat (fd1, file1, fd2, file2, flag) == 0);
+ ASSERT (unlinkat (fd1, file1, 0) == 0);
+ free (file1);
+ free (file2);
+ }
+ dfd2 = open ("..", O_RDONLY);
+ ASSERT (0 <= dfd2);
+ ASSERT (linkat (dfd, "../" BASE "32", dfd2, BASE "33", 0) == 0);
+ ASSERT (linkat (dfd, "../" BASE "33", dfd2, BASE "34",
+ AT_SYMLINK_FOLLOW) == 0);
+ ASSERT (close (dfd2) == 0);
+
+ /* Now we change back to the parent directory, and set dfd to ".",
+ in order to test behavior on symlinks. */
+ ASSERT (chdir ("..") == 0);
+ ASSERT (close (dfd) == 0);
+ if (symlink (BASE "sub1", BASE "link1"))
+ {
+ ASSERT (unlink (BASE "32") == 0);
+ ASSERT (unlink (BASE "33") == 0);
+ ASSERT (unlink (BASE "34") == 0);
+ ASSERT (rmdir (BASE "sub1") == 0);
+ ASSERT (rmdir (BASE "sub2") == 0);
+ free (cwd);
+ if (!result)
+ fputs ("skipping test: symlinks not supported on this file system\n",
+ stderr);
+ return result;
+ }
+ dfd = open (".", O_RDONLY);
+ ASSERT (0 <= dfd);
+ ASSERT (symlink (BASE "34", BASE "link2") == 0);
+ ASSERT (symlink (BASE "link3", BASE "link3") == 0);
+ ASSERT (symlink (BASE "nowhere", BASE "link4") == 0);
+
+ /* Link cannot overwrite existing files. */
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link1", dfd, BASE "sub1", 0) == -1);
+ ASSERT (errno == EEXIST);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link1/", dfd, BASE "sub1", 0) == -1);
+ ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link1", dfd, BASE "sub1/", 0) == -1);
+ ASSERT (errno == EEXIST || errno == ENOTDIR);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link1", dfd, BASE "sub1",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link1/", dfd, BASE "sub1",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES
+ || errno == EINVAL);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link1", dfd, BASE "sub1/",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES
+ || errno == EINVAL);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link2", 0) == -1);
+ ASSERT (errno == EEXIST);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link2",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link3", 0) == -1);
+ ASSERT (errno == EEXIST || errno == ELOOP);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link3",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES
+ || errno == ELOOP);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link2", dfd, BASE "link3", 0) == -1);
+ ASSERT (errno == EEXIST || errno == ELOOP);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link2", dfd, BASE "link3",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == EEXIST || errno == ELOOP);
+
+ /* AT_SYMLINK_FOLLOW only follows first argument, not second. */
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link4", 0) == -1);
+ ASSERT (errno == EEXIST);
+ ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link4",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "34", dfd, BASE "link4", 0) == -1);
+ ASSERT (errno == EEXIST);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "34", dfd, BASE "link4", AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == EEXIST);
+
+ /* Trailing slash handling. */
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link2/", dfd, BASE "link5", 0) == -1);
+ ASSERT (errno == ENOTDIR);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link2/", dfd, BASE "link5",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == ENOTDIR || errno == EINVAL);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link3/", dfd, BASE "link5", 0) == -1);
+ ASSERT (errno == ELOOP);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link3/", dfd, BASE "link5",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == ELOOP || errno == EINVAL);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link4/", dfd, BASE "link5", 0) == -1);
+ ASSERT (errno == ENOENT);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link4/", dfd, BASE "link5",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == ENOENT || errno == EINVAL);
+
+ /* Check for hard links to symlinks. */
+ ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link5", 0) == 0);
+ check_same_link (BASE "link1", BASE "link5");
+ ASSERT (unlink (BASE "link5") == 0);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link5",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == EPERM || errno == EACCES);
+ ASSERT (linkat (dfd, BASE "link2", dfd, BASE "link5", 0) == 0);
+ check_same_link (BASE "link2", BASE "link5");
+ ASSERT (unlink (BASE "link5") == 0);
+ ASSERT (linkat (dfd, BASE "link2", dfd, BASE "file", AT_SYMLINK_FOLLOW) == 0);
+ errno = 0;
+ ASSERT (areadlink (BASE "file") == NULL);
+ ASSERT (errno == EINVAL);
+ ASSERT (unlink (BASE "file") == 0);
+ ASSERT (linkat (dfd, BASE "link3", dfd, BASE "link5", 0) == 0);
+ check_same_link (BASE "link3", BASE "link5");
+ ASSERT (unlink (BASE "link5") == 0);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link3", dfd, BASE "link5",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == ELOOP);
+ ASSERT (linkat (dfd, BASE "link4", dfd, BASE "link5", 0) == 0);
+ check_same_link (BASE "link4", BASE "link5");
+ ASSERT (unlink (BASE "link5") == 0);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link4", dfd, BASE "link5",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == ENOENT);
+
+ /* Check that symlink to symlink to file is followed all the way. */
+ ASSERT (symlink (BASE "link2", BASE "link5") == 0);
+ ASSERT (linkat (dfd, BASE "link5", dfd, BASE "link6", 0) == 0);
+ check_same_link (BASE "link5", BASE "link6");
+ ASSERT (unlink (BASE "link6") == 0);
+ ASSERT (linkat (dfd, BASE "link5", dfd, BASE "file", AT_SYMLINK_FOLLOW) == 0);
+ errno = 0;
+ ASSERT (areadlink (BASE "file") == NULL);
+ ASSERT (errno == EINVAL);
+ ASSERT (unlink (BASE "file") == 0);
+ ASSERT (unlink (BASE "link5") == 0);
+ ASSERT (symlink (BASE "link3", BASE "link5") == 0);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link5", dfd, BASE "file",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == ELOOP);
+ ASSERT (unlink (BASE "link5") == 0);
+ ASSERT (symlink (BASE "link4", BASE "link5") == 0);
+ errno = 0;
+ ASSERT (linkat (dfd, BASE "link5", dfd, BASE "file",
+ AT_SYMLINK_FOLLOW) == -1);
+ ASSERT (errno == ENOENT);
+
+ /* Now for some real fun with directory crossing. */
+ ASSERT (symlink (cwd, BASE "sub1/link") == 0);
+ ASSERT (symlink (".././/" BASE "sub1/link/" BASE "link2",
+ BASE "sub2/link") == 0);
+ ASSERT (close (dfd) == 0);
+ dfd = open (BASE "sub1", O_RDONLY);
+ ASSERT (0 <= dfd);
+ dfd2 = open (BASE "sub2", O_RDONLY);
+ ASSERT (0 < dfd2);
+ ASSERT (linkat (dfd, "../" BASE "sub2/link", dfd2, "./..//" BASE "sub1/file",
+ AT_SYMLINK_FOLLOW) == 0);
+ errno = 0;
+ ASSERT (areadlink (BASE "sub1/file") == NULL);
+ ASSERT (errno == EINVAL);
+
+ /* Cleanup. */
+ ASSERT (close (dfd) == 0);
+ ASSERT (close (dfd2) == 0);
+ ASSERT (unlink (BASE "sub1/file") == 0);
+ ASSERT (unlink (BASE "sub1/link") == 0);
+ ASSERT (unlink (BASE "sub2/link") == 0);
+ ASSERT (unlink (BASE "32") == 0);
+ ASSERT (unlink (BASE "33") == 0);
+ ASSERT (unlink (BASE "34") == 0);
+ ASSERT (rmdir (BASE "sub1") == 0);
+ ASSERT (rmdir (BASE "sub2") == 0);
+ ASSERT (unlink (BASE "link1") == 0);
+ ASSERT (unlink (BASE "link2") == 0);
+ ASSERT (unlink (BASE "link3") == 0);
+ ASSERT (unlink (BASE "link4") == 0);
+ ASSERT (unlink (BASE "link5") == 0);
+ free (cwd);
+ return result;
+}
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