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Systemd/src/test/test-fd-util.c
Lennart Poettering 43dc7aa2ba coccinelle: always use fcntl(fd, FD_DUPFD, 3) instead of dup(fd) 
Let's avoid fds 0…2 for safety reasons.
2018-03-20 22:31:14 +01:00

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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd 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.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <fcntl.h>
#include <unistd.h>
#include "alloc-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "macro.h"
#include "path-util.h"
#include "process-util.h"
#include "random-util.h"
#include "string-util.h"
#include "util.h"
static void test_close_many(void) {
int fds[3];
char name0[] = "/tmp/test-close-many.XXXXXX";
char name1[] = "/tmp/test-close-many.XXXXXX";
char name2[] = "/tmp/test-close-many.XXXXXX";
fds[0] = mkostemp_safe(name0);
fds[1] = mkostemp_safe(name1);
fds[2] = mkostemp_safe(name2);
close_many(fds, 2);
assert_se(fcntl(fds[0], F_GETFD) == -1);
assert_se(fcntl(fds[1], F_GETFD) == -1);
assert_se(fcntl(fds[2], F_GETFD) >= 0);
safe_close(fds[2]);
unlink(name0);
unlink(name1);
unlink(name2);
}
static void test_close_nointr(void) {
char name[] = "/tmp/test-test-close_nointr.XXXXXX";
int fd;
fd = mkostemp_safe(name);
assert_se(fd >= 0);
assert_se(close_nointr(fd) >= 0);
assert_se(close_nointr(fd) < 0);
unlink(name);
}
static void test_same_fd(void) {
_cleanup_close_pair_ int p[2] = { -1, -1 };
_cleanup_close_ int a = -1, b = -1, c = -1;
assert_se(pipe2(p, O_CLOEXEC) >= 0);
assert_se((a = fcntl(p[0], F_DUPFD, 3)) >= 0);
assert_se((b = open("/dev/null", O_RDONLY|O_CLOEXEC)) >= 0);
assert_se((c = fcntl(a, F_DUPFD, 3)) >= 0);
assert_se(same_fd(p[0], p[0]) > 0);
assert_se(same_fd(p[1], p[1]) > 0);
assert_se(same_fd(a, a) > 0);
assert_se(same_fd(b, b) > 0);
assert_se(same_fd(a, p[0]) > 0);
assert_se(same_fd(p[0], a) > 0);
assert_se(same_fd(c, p[0]) > 0);
assert_se(same_fd(p[0], c) > 0);
assert_se(same_fd(a, c) > 0);
assert_se(same_fd(c, a) > 0);
assert_se(same_fd(p[0], p[1]) == 0);
assert_se(same_fd(p[1], p[0]) == 0);
assert_se(same_fd(p[0], b) == 0);
assert_se(same_fd(b, p[0]) == 0);
assert_se(same_fd(p[1], a) == 0);
assert_se(same_fd(a, p[1]) == 0);
assert_se(same_fd(p[1], b) == 0);
assert_se(same_fd(b, p[1]) == 0);
assert_se(same_fd(a, b) == 0);
assert_se(same_fd(b, a) == 0);
}
static void test_open_serialization_fd(void) {
_cleanup_close_ int fd = -1;
fd = open_serialization_fd("test");
assert_se(fd >= 0);
assert_se(write(fd, "test\n", 5) == 5);
}
static void test_acquire_data_fd_one(unsigned flags) {
char wbuffer[196*1024 - 7];
char rbuffer[sizeof(wbuffer)];
int fd;
fd = acquire_data_fd("foo", 3, flags);
assert_se(fd >= 0);
zero(rbuffer);
assert_se(read(fd, rbuffer, sizeof(rbuffer)) == 3);
assert_se(streq(rbuffer, "foo"));
fd = safe_close(fd);
fd = acquire_data_fd("", 0, flags);
assert_se(fd >= 0);
zero(rbuffer);
assert_se(read(fd, rbuffer, sizeof(rbuffer)) == 0);
assert_se(streq(rbuffer, ""));
fd = safe_close(fd);
random_bytes(wbuffer, sizeof(wbuffer));
fd = acquire_data_fd(wbuffer, sizeof(wbuffer), flags);
assert_se(fd >= 0);
zero(rbuffer);
assert_se(read(fd, rbuffer, sizeof(rbuffer)) == sizeof(rbuffer));
assert_se(memcmp(rbuffer, wbuffer, sizeof(rbuffer)) == 0);
fd = safe_close(fd);
}
static void test_acquire_data_fd(void) {
test_acquire_data_fd_one(0);
test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL);
test_acquire_data_fd_one(ACQUIRE_NO_MEMFD);
test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL|ACQUIRE_NO_MEMFD);
test_acquire_data_fd_one(ACQUIRE_NO_PIPE);
test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL|ACQUIRE_NO_PIPE);
test_acquire_data_fd_one(ACQUIRE_NO_MEMFD|ACQUIRE_NO_PIPE);
test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL|ACQUIRE_NO_MEMFD|ACQUIRE_NO_PIPE);
test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL|ACQUIRE_NO_MEMFD|ACQUIRE_NO_PIPE|ACQUIRE_NO_TMPFILE);
}
static void test_fd_move_above_stdio(void) {
int original_stdin, new_fd;
original_stdin = fcntl(0, F_DUPFD, 3);
assert_se(original_stdin >= 3);
assert_se(close_nointr(0) != EBADF);
new_fd = open("/dev/null", O_RDONLY);
assert_se(new_fd == 0);
new_fd = fd_move_above_stdio(new_fd);
assert_se(new_fd >= 3);
assert_se(dup(original_stdin) == 0);
assert_se(close_nointr(original_stdin) != EBADF);
assert_se(close_nointr(new_fd) != EBADF);
}
static void test_rearrange_stdio(void) {
pid_t pid;
int r;
r = safe_fork("rearrange", FORK_WAIT|FORK_LOG, &pid);
assert_se(r >= 0);
if (r == 0) {
_cleanup_free_ char *path = NULL;
char buffer[10];
/* Child */
safe_close(STDERR_FILENO); /* Let's close an fd < 2, to make it more interesting */
assert_se(rearrange_stdio(-1, -1, -1) >= 0);
assert_se(fd_get_path(STDIN_FILENO, &path) >= 0);
assert_se(path_equal(path, "/dev/null"));
path = mfree(path);
assert_se(fd_get_path(STDOUT_FILENO, &path) >= 0);
assert_se(path_equal(path, "/dev/null"));
path = mfree(path);
assert_se(fd_get_path(STDOUT_FILENO, &path) >= 0);
assert_se(path_equal(path, "/dev/null"));
path = mfree(path);
safe_close(STDIN_FILENO);
safe_close(STDOUT_FILENO);
safe_close(STDERR_FILENO);
{
int pair[2];
assert_se(pipe(pair) >= 0);
assert_se(pair[0] == 0);
assert_se(pair[1] == 1);
assert_se(fd_move_above_stdio(0) == 3);
}
assert_se(open("/dev/full", O_WRONLY|O_CLOEXEC) == 0);
assert_se(acquire_data_fd("foobar", 6, 0) == 2);
assert_se(rearrange_stdio(2, 0, 1) >= 0);
assert_se(write(1, "x", 1) < 0 && errno == ENOSPC);
assert_se(write(2, "z", 1) == 1);
assert_se(read(3, buffer, sizeof(buffer)) == 1);
assert_se(buffer[0] == 'z');
assert_se(read(0, buffer, sizeof(buffer)) == 6);
assert_se(memcmp(buffer, "foobar", 6) == 0);
assert_se(rearrange_stdio(-1, 1, 2) >= 0);
assert_se(write(1, "a", 1) < 0 && errno == ENOSPC);
assert_se(write(2, "y", 1) == 1);
assert_se(read(3, buffer, sizeof(buffer)) == 1);
assert_se(buffer[0] == 'y');
assert_se(fd_get_path(0, &path) >= 0);
assert_se(path_equal(path, "/dev/null"));
path = mfree(path);
_exit(EXIT_SUCCESS);
}
}
int main(int argc, char *argv[]) {
test_close_many();
test_close_nointr();
test_same_fd();
test_open_serialization_fd();
test_acquire_data_fd();
test_fd_move_above_stdio();
test_rearrange_stdio();
return 0;
}
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