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/* Check multiple telldir and seekdir.
Copyright (C) 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 <dirent.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/xunistd.h>
/* Some filesystems returns an arbitrary value for d_off direnty entry (ext4
for instance, where the value is an internal hash key). The idea of create
a large number of file is to try trigger a overflow d_off value in a entry
to check if telldir/seekdir does work corretly in such case. */
static const char *dirname;
/* The 2 extra files are '.' and '..'. */
static const size_t nfiles = (1<<14) + 2;
static inline bool
in_ino_t_range (ino64_t v)
{
ino_t s = v;
return s == v;
}
static inline bool
in_off_t_range (off64_t v)
{
off_t s = v;
return s == v;
}
static void
do_prepare (int argc, char *argv[])
{
dirname = support_create_temp_directory ("tst-opendir-nolfs-");
for (size_t i = 0; i < nfiles - 2; i++)
{
int fd = create_temp_file_in_dir ("tempfile.", dirname, NULL);
TEST_VERIFY_EXIT (fd > 0);
close (fd);
}
}
#define PREPARE do_prepare
static int
do_test (void)
{
DIR *dirp = opendir (dirname);
TEST_VERIFY_EXIT (dirp != NULL);
long int *tdirp = xreallocarray (NULL, nfiles, sizeof (long int));
struct dirent **ddirp = xreallocarray (NULL, nfiles,
sizeof (struct dirent *));
/* For non-LFS, the entry is skipped if it can not be converted. */
int count = 0;
for (; count < nfiles; count++)
{
struct dirent *dp = readdir (dirp);
if (dp == NULL)
break;
tdirp[count] = telldir (dirp);
ddirp[count] = xmalloc (dp->d_reclen);
memcpy (ddirp[count], dp, dp->d_reclen);
}
closedir (dirp);
/* Check against the getdents64 syscall. */
int fd = xopen (dirname, O_RDONLY | O_DIRECTORY, 0);
int i = 0;
while (true)
{
struct
{
char buffer[1024];
struct dirent64 pad;
} data;
ssize_t ret = getdents64 (fd, &data.buffer, sizeof (data.buffer));
if (ret < 0)
FAIL_EXIT1 ("getdents64: %m");
if (ret == 0)
break;
char *current = data.buffer;
char *end = data.buffer + ret;
while (current != end)
{
struct dirent64 entry;
memcpy (&entry, current, sizeof (entry));
/* Truncate overlong strings. */
entry.d_name[sizeof (entry.d_name) - 1] = '\0';
TEST_VERIFY (strlen (entry.d_name) < sizeof (entry.d_name) - 1);
if (in_ino_t_range (entry.d_ino))
{
TEST_COMPARE_STRING (entry.d_name, ddirp[i]->d_name);
TEST_COMPARE (entry.d_ino, ddirp[i]->d_ino);
TEST_COMPARE (entry.d_type, ddirp[i]->d_type);
/* Offset zero is reserved for the first entry. */
TEST_VERIFY (entry.d_off != 0);
TEST_VERIFY_EXIT (entry.d_reclen <= end - current);
i++;
}
current += entry.d_reclen;
}
}
TEST_COMPARE (count, i);
free (tdirp);
for (int i = 0; i < count; i++)
free (ddirp[i]);
free (ddirp);
return 0;
}
#include <support/test-driver.c>
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