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/* Test glob danglin symlink match (BZ #866).
Copyright (C) 2017-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include <stddef.h>
#include <glob.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <support/check.h>
#include <support/temp_file.h>
static void do_prepare (int argc, char *argv[]);
#define PREPARE do_prepare
static int do_test (void);
#include <support/test-driver.c>
/* Maximum number of symlink calls for create_link function. */
#define MAX_CREATE_LINK_TRIES 10
static void
create_link (const char *base, const char *fname, char *linkname,
size_t linknamesize)
{
int ntries = 0;
while (1)
{
snprintf (linkname, linknamesize, "%s/%s%02d", test_dir, base,
ntries);
if (symlink (fname, linkname) == 0)
break;
if (errno != EEXIST)
FAIL_EXIT1 ("symlink failed: %m");
if (ntries++ == MAX_CREATE_LINK_TRIES)
FAIL_EXIT1 ("symlink failed with EEXIST too many times");
}
add_temp_file (linkname);
}
#ifndef PATH_MAX
# define PATH_MAX 1024
#endif
static char valid_link[PATH_MAX];
static char dangling_link[PATH_MAX];
static char dangling_dir[PATH_MAX];
static void
do_prepare (int argc, char *argv[])
{
char *fname;
create_temp_file ("tst-glob_symlinks.", &fname);
/* Create an existing symlink. */
create_link ("valid-symlink-tst-glob_symlinks", fname, valid_link,
sizeof valid_link);
/* Create a dangling symlink to a file. */
int fd = create_temp_file ("dangling-tst-glob_file", &fname);
TEST_VERIFY_EXIT (close (fd) == 0);
/* It throws a warning at process end due 'add_temp_file' trying to
unlink it again. */
TEST_VERIFY_EXIT (unlink (fname) == 0);
create_link ("dangling-symlink-file-tst-glob", fname, dangling_link,
sizeof dangling_link);
/* Create a dangling symlink to a directory. */
char tmpdir[PATH_MAX];
snprintf (tmpdir, sizeof tmpdir, "%s/dangling-tst-glob_folder.XXXXXX",
test_dir);
TEST_VERIFY_EXIT (mkdtemp (tmpdir) != NULL);
create_link ("dangling-symlink-dir-tst-glob", tmpdir, dangling_dir,
sizeof dangling_dir);
TEST_VERIFY_EXIT (rmdir (tmpdir) == 0);
}
static int
do_test (void)
{
char buf[PATH_MAX + 1];
glob_t gl;
TEST_VERIFY_EXIT (glob (valid_link, 0, NULL, &gl) == 0);
TEST_VERIFY_EXIT (gl.gl_pathc == 1);
TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], valid_link) == 0);
globfree (&gl);
TEST_VERIFY_EXIT (glob (dangling_link, 0, NULL, &gl) == 0);
TEST_VERIFY_EXIT (gl.gl_pathc == 1);
TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], dangling_link) == 0);
globfree (&gl);
TEST_VERIFY_EXIT (glob (dangling_dir, 0, NULL, &gl) == 0);
TEST_VERIFY_EXIT (gl.gl_pathc == 1);
TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], dangling_dir) == 0);
globfree (&gl);
snprintf (buf, sizeof buf, "%s", dangling_link);
buf[strlen(buf) - 1] = '?';
TEST_VERIFY_EXIT (glob (buf, 0, NULL, &gl) == 0);
TEST_VERIFY_EXIT (gl.gl_pathc == 1);
TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], dangling_link) == 0);
globfree (&gl);
/* glob should handle dangling symbol as normal file, so <file>? should
return an empty string. */
snprintf (buf, sizeof buf, "%s?", dangling_link);
TEST_VERIFY_EXIT (glob (buf, 0, NULL, &gl) != 0);
globfree (&gl);
snprintf (buf, sizeof buf, "%s*", dangling_link);
TEST_VERIFY_EXIT (glob (buf, 0, NULL, &gl) == 0);
TEST_VERIFY_EXIT (gl.gl_pathc == 1);
TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], dangling_link) == 0);
globfree (&gl);
return 0;
}
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