picnoir
/
Systemd
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
Systemd/src/test/test-fd-util.c

432 lines
13 KiB
C
Raw Blame History

/* SPDX-License-Identifier: LGPL-2.1+ */
#include <fcntl.h>
#include <unistd.h>
#include "alloc-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "macro.h"
#include "memory-util.h"
#include "path-util.h"
#include "process-util.h"
#include "random-util.h"
#include "rlimit-util.h"
#include "serialize.h"
#include "string-util.h"
#include "tests.h"
#include "tmpfile-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);
}
}
static void assert_equal_fd(int fd1, int fd2) {
for (;;) {
uint8_t a[4096], b[4096];
ssize_t x, y;
x = read(fd1, a, sizeof(a));
assert_se(x >= 0);
y = read(fd2, b, sizeof(b));
assert_se(y >= 0);
assert_se(x == y);
if (x == 0)
break;
assert_se(memcmp(a, b, x) == 0);
}
}
static void test_fd_duplicate_data_fd(void) {
_cleanup_close_ int fd1 = -1, fd2 = -1;
_cleanup_(close_pairp) int sfd[2] = { -1, -1 };
_cleanup_(sigkill_waitp) pid_t pid = -1;
uint64_t i, j;
int r;
fd1 = open("/etc/fstab", O_RDONLY|O_CLOEXEC);
if (fd1 >= 0) {
fd2 = fd_duplicate_data_fd(fd1);
assert_se(fd2 >= 0);
assert_se(lseek(fd1, 0, SEEK_SET) == 0);
assert_equal_fd(fd1, fd2);
}
fd1 = safe_close(fd1);
fd2 = safe_close(fd2);
fd1 = acquire_data_fd("hallo", 6, 0);
assert_se(fd1 >= 0);
fd2 = fd_duplicate_data_fd(fd1);
assert_se(fd2 >= 0);
safe_close(fd1);
fd1 = acquire_data_fd("hallo", 6, 0);
assert_se(fd1 >= 0);
assert_equal_fd(fd1, fd2);
fd1 = safe_close(fd1);
fd2 = safe_close(fd2);
assert_se(socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0, sfd) >= 0);
r = safe_fork("(sd-pipe)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
assert_se(r >= 0);
if (r == 0) {
/* child */
sfd[0] = safe_close(sfd[0]);
for (i = 0; i < 1536*1024 / sizeof(uint64_t); i++)
assert_se(write(sfd[1], &i, sizeof(i)) == sizeof(i));
sfd[1] = safe_close(sfd[1]);
_exit(EXIT_SUCCESS);
}
sfd[1] = safe_close(sfd[1]);
fd2 = fd_duplicate_data_fd(sfd[0]);
assert_se(fd2 >= 0);
for (i = 0; i < 1536*1024 / sizeof(uint64_t); i++) {
assert_se(read(fd2, &j, sizeof(j)) == sizeof(j));
assert_se(i == j);
}
assert_se(read(fd2, &j, sizeof(j)) == 0);
}
static void test_read_nr_open(void) {
log_info("nr-open: %i", read_nr_open());
}
static size_t validate_fds(
bool opened,
const int *fds,
size_t n_fds) {
size_t c = 0;
/* Validates that fds in the specified array are one of the following three:
*
* 1. < 0 (test is skipped) or
* 2. opened (if 'opened' param is true) or
* 3. closed (if 'opened' param is false)
*/
for (size_t i = 0; i < n_fds; i++) {
if (fds[i] < 0)
continue;
if (opened)
assert_se(fcntl(fds[i], F_GETFD) >= 0);
else
assert_se(fcntl(fds[i], F_GETFD) < 0 && errno == EBADF);
c++;
}
return c; /* Return number of fds >= 0 in the array */
}
static void test_close_all_fds(void) {
_cleanup_free_ int *fds = NULL, *keep = NULL;
struct rlimit rl;
size_t n_fds, n_keep;
log_info("/* %s */", __func__);
rlimit_nofile_bump(-1);
assert_se(getrlimit(RLIMIT_NOFILE, &rl) >= 0);
assert_se(rl.rlim_cur > 10);
/* Try to use 5000 fds, but when we can't bump the rlimit to make that happen use the whole limit minus 10 */
n_fds = MIN((rl.rlim_cur & ~1U) - 10U, 5000U);
assert_se((n_fds & 1U) == 0U); /* make sure even number of fds */
/* Allocate the determined number of fds, always two at a time */
assert_se(fds = new(int, n_fds));
for (size_t i = 0; i < n_fds; i += 2)
assert_se(pipe2(fds + i, O_CLOEXEC) >= 0);
/* Validate this worked */
assert_se(validate_fds(true, fds, n_fds) == n_fds);
/* Randomized number of fds to keep, but at most every second */
n_keep = (random_u64() % (n_fds / 2));
/* Now randomly select a number of fds from the array above to keep */
assert_se(keep = new(int, n_keep));
for (size_t k = 0; k < n_keep; k++) {
for (;;) {
size_t p;
p = random_u64() % n_fds;
if (fds[p] >= 0) {
keep[k] = TAKE_FD(fds[p]);
break;
}
}
}
/* Check that all fds from both arrays are still open, and test how many in each are >= 0 */
assert_se(validate_fds(true, fds, n_fds) == n_fds - n_keep);
assert_se(validate_fds(true, keep, n_keep) == n_keep);
/* Close logging fd first, so that we don't confuse it by closing its fd */
log_close();
log_set_open_when_needed(true);
/* Close all but the ones to keep */
assert_se(close_all_fds(keep, n_keep) >= 0);
assert_se(validate_fds(false, fds, n_fds) == n_fds - n_keep);
assert_se(validate_fds(true, keep, n_keep) == n_keep);
/* Close everything else too! */
assert_se(close_all_fds(NULL, 0) >= 0);
assert_se(validate_fds(false, fds, n_fds) == n_fds - n_keep);
assert_se(validate_fds(false, keep, n_keep) == n_keep);
log_set_open_when_needed(false);
log_open();
}
int main(int argc, char *argv[]) {
test_setup_logging(LOG_DEBUG);
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();
test_fd_duplicate_data_fd();
test_read_nr_open();
test_close_all_fds();
return 0;
}
Reference in New Issue View Git Blame Copy Permalink