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/* Test readdir (+variants) behavior with file names of varying length.
Copyright (C) 2024 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/fuse.h>
#include <support/support.h>
#include <support/xdirent.h>
#include <support/readdir.h>
/* If positive, at this length an EMSGSIZE error is injected. */
static _Atomic int inject_error_at_length;
/* Return a file name, LENGTH bytes long. */
static char *
name_of_length (size_t length)
{
char *result = xmalloc (length + 1);
unsigned int prefix = snprintf (result, length + 1, "%zu-", length);
for (size_t i = prefix; i < length; ++i)
result[i] = 'A' + ((length + i) % 26);
result[length] = '\0';
return result;
}
/* Add the directory entry at OFFSET to the stream D. */
static uint64_t
add_directory_entry (struct support_fuse_dirstream *d, uint64_t offset)
{
unsigned int length = offset + 1;
if (length > 1000)
/* Longer than what is possible to produce with 256
UTF-8-encoded Unicode code points. */
return 0;
char *to_free = NULL;
const char *name;
uint64_t ino = 1000 + length; /* Arbitrary value, distinct from 1. */
uint32_t type = DT_REG;
if (offset <= 1)
{
type = DT_DIR;
name = ".." + !offset; /* "." or "..". */
ino = 1;
}
else if (length == 1000)
name = "short";
else
{
to_free = name_of_length (length);
name = to_free;
}
++offset;
bool added = support_fuse_dirstream_add (d, ino, offset, type, name);
free (to_free);
if (added)
return offset;
else
return 0;
}
/* Set to true if getdents64 should produce only one entry. */
static _Atomic bool one_entry_per_getdents64;
static void
fuse_thread (struct support_fuse *f, void *closure)
{
struct fuse_in_header *inh;
while ((inh = support_fuse_next (f)) != NULL)
{
if (support_fuse_handle_mountpoint (f)
|| (inh->nodeid == 1 && support_fuse_handle_directory (f)))
continue;
switch (inh->opcode)
{
case FUSE_READDIR:
if (inh->nodeid == 1)
{
uint64_t offset = support_fuse_cast (READ, inh)->offset;
if (inject_error_at_length == offset + 1)
support_fuse_reply_error (f, EMSGSIZE);
else
{
struct support_fuse_dirstream *d
= support_fuse_prepare_readdir (f);
while (true)
{
offset = add_directory_entry (d, offset);
if (offset == 0 || one_entry_per_getdents64
/* Error will be reported at next READDIR. */
|| offset + 1 == inject_error_at_length)
break;
}
support_fuse_reply_prepared (f);
}
}
else
support_fuse_reply_error (f, EIO);
break;
default:
FAIL ("unexpected event %s", support_fuse_opcode (inh->opcode));
support_fuse_reply_error (f, EIO);
}
}
}
/* Run the tests for the specified readdir variant OP. */
static void
run_readdir_tests (struct support_fuse *f, enum support_readdir_op op)
{
printf ("info: testing %s (inject_error=%d unbuffered=%d)\n",
support_readdir_function (op), inject_error_at_length,
(int) one_entry_per_getdents64);
bool testing_r = support_readdir_r_variant (op);
DIR *dir = xopendir (support_fuse_mountpoint (f));
struct support_dirent e = { 0, };
TEST_VERIFY (support_readdir (dir, op, &e));
TEST_COMPARE (e.d_ino, 1);
TEST_COMPARE_STRING (e.d_name, ".");
TEST_VERIFY (support_readdir (dir, op, &e));
TEST_COMPARE (e.d_ino, 1);
TEST_COMPARE_STRING (e.d_name, "..");
for (unsigned int i = 3; i < 1000; ++i)
{
if (i == inject_error_at_length)
/* Error expected below. */
break;
if (i >= sizeof ((struct dirent) { 0, }.d_name) && testing_r)
/* This is a readir_r test. The longer names are not
available because they do not fit into struct dirent. */
break;
char *expected_name = name_of_length (i);
TEST_COMPARE (strlen (expected_name), i);
TEST_VERIFY (support_readdir (dir, op, &e));
TEST_COMPARE (e.d_ino, 1000 + i);
TEST_COMPARE_STRING (e.d_name, expected_name);
free (expected_name);
}
if (inject_error_at_length == 0)
{
/* Check that the ENAMETOOLONG error does not prevent reading a
later short name. */
TEST_VERIFY (support_readdir (dir, op, &e));
TEST_COMPARE (e.d_ino, 2000);
TEST_COMPARE_STRING (e.d_name, "short");
if (testing_r)
/* An earlier name was too long. */
support_readdir_expect_error (dir, op, ENAMETOOLONG);
else
/* Entire directory read without error. */
TEST_VERIFY (!support_readdir (dir, op, &e));
}
else
support_readdir_expect_error (dir, op, EMSGSIZE);
free (e.d_name);
xclosedir (dir);
}
/* Run all readdir variants for both fully-buffered an unbuffered
(one-at-a-time) directory streams. */
static void
run_fully_buffered_and_singleton_buffers (struct support_fuse *f)
{
for (int do_one_entry = 0; do_one_entry < 2; ++do_one_entry)
{
one_entry_per_getdents64 = do_one_entry;
for (enum support_readdir_op op = 0; op <= support_readdir_op_last();
++op)
run_readdir_tests (f, op);
}
}
static int
do_test (void)
{
/* Smoke test for name_of_length. */
{
char *name = name_of_length (5);
TEST_COMPARE_STRING (name, "5-HIJ");
free (name);
name = name_of_length (6);
TEST_COMPARE_STRING (name, "6-IJKL");
free (name);
}
support_fuse_init ();
struct support_fuse *f = support_fuse_mount (fuse_thread, NULL);
run_fully_buffered_and_singleton_buffers (f);
inject_error_at_length = 100;
run_fully_buffered_and_singleton_buffers (f);
inject_error_at_length = 300;
run_fully_buffered_and_singleton_buffers (f);
support_fuse_unmount (f);
return 0;
}
#include <support/test-driver.c>
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