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48542eac39999f58f6c331b4b3cdf2d78bf15979
systemd/src/test/test-stat-util.c
Zbigniew Jędrzejewski-Szmek 48542eac39 basic/stat-util: add null_or_empty_path_with_root()
2022-03-29 15:07:05 +02:00

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <fcntl.h>
#include <linux/magic.h>
#include <sched.h>
#include <unistd.h>
#include "alloc-util.h"
#include "errno-list.h"
#include "fd-util.h"
#include "fs-util.h"
#include "macro.h"
#include "mountpoint-util.h"
#include "namespace-util.h"
#include "path-util.h"
#include "rm-rf.h"
#include "stat-util.h"
#include "tests.h"
#include "tmpfile-util.h"
TEST(null_or_empty_path) {
assert_se(null_or_empty_path("/dev/null") == 1);
assert_se(null_or_empty_path("/dev/tty") == 1); /* We assume that any character device is "empty", bleh. */
assert_se(null_or_empty_path("../../../../../../../../../../../../../../../../../../../../dev/null") == 1);
assert_se(null_or_empty_path("/proc/self/exe") == 0);
assert_se(null_or_empty_path("/nosuchfileordir") == -ENOENT);
}
TEST(null_or_empty_path_with_root) {
assert_se(null_or_empty_path_with_root("/dev/null", NULL) == 1);
assert_se(null_or_empty_path_with_root("/dev/null", "/") == 1);
assert_se(null_or_empty_path_with_root("/dev/null", "/.././../") == 1);
assert_se(null_or_empty_path_with_root("/dev/null", "/.././..") == 1);
assert_se(null_or_empty_path_with_root("../../../../../../../../../../../../../../../../../../../../dev/null", NULL) == 1);
assert_se(null_or_empty_path_with_root("../../../../../../../../../../../../../../../../../../../../dev/null", "/") == 1);
assert_se(null_or_empty_path_with_root("/proc/self/exe", NULL) == 0);
assert_se(null_or_empty_path_with_root("/proc/self/exe", "/") == 0);
assert_se(null_or_empty_path_with_root("/nosuchfileordir", NULL) == -ENOENT);
assert_se(null_or_empty_path_with_root("/nosuchfileordir", "/.././../") == -ENOENT);
assert_se(null_or_empty_path_with_root("/nosuchfileordir", "/.././..") == -ENOENT);
assert_se(null_or_empty_path_with_root("/foobar/barbar/dev/null", "/foobar/barbar") == 1);
assert_se(null_or_empty_path_with_root("/foobar/barbar/dev/null", "/foobar/barbar/") == 1);
}
TEST(files_same) {
_cleanup_close_ int fd = -1;
char name[] = "/tmp/test-files_same.XXXXXX";
char name_alias[] = "/tmp/test-files_same.alias";
fd = mkostemp_safe(name);
assert_se(fd >= 0);
assert_se(symlink(name, name_alias) >= 0);
assert_se(files_same(name, name, 0));
assert_se(files_same(name, name, AT_SYMLINK_NOFOLLOW));
assert_se(files_same(name, name_alias, 0));
assert_se(!files_same(name, name_alias, AT_SYMLINK_NOFOLLOW));
unlink(name);
unlink(name_alias);
}
TEST(is_symlink) {
char name[] = "/tmp/test-is_symlink.XXXXXX";
char name_link[] = "/tmp/test-is_symlink.link";
_cleanup_close_ int fd = -1;
fd = mkostemp_safe(name);
assert_se(fd >= 0);
assert_se(symlink(name, name_link) >= 0);
assert_se(is_symlink(name) == 0);
assert_se(is_symlink(name_link) == 1);
assert_se(is_symlink("/a/file/which/does/not/exist/i/guess") < 0);
unlink(name);
unlink(name_link);
}
TEST(path_is_fs_type) {
/* run might not be a mount point in build chroots */
if (path_is_mount_point("/run", NULL, AT_SYMLINK_FOLLOW) > 0) {
assert_se(path_is_fs_type("/run", TMPFS_MAGIC) > 0);
assert_se(path_is_fs_type("/run", BTRFS_SUPER_MAGIC) == 0);
}
if (path_is_mount_point("/proc", NULL, AT_SYMLINK_FOLLOW) > 0) {
assert_se(path_is_fs_type("/proc", PROC_SUPER_MAGIC) > 0);
assert_se(path_is_fs_type("/proc", BTRFS_SUPER_MAGIC) == 0);
}
assert_se(path_is_fs_type("/i-dont-exist", BTRFS_SUPER_MAGIC) == -ENOENT);
}
TEST(path_is_temporary_fs) {
int r;
FOREACH_STRING(s, "/", "/run", "/sys", "/sys/", "/proc", "/i-dont-exist", "/var", "/var/lib") {
r = path_is_temporary_fs(s);
log_info_errno(r, "path_is_temporary_fs(\"%s\"): %d, %s",
s, r, r < 0 ? errno_to_name(r) : yes_no(r));
}
/* run might not be a mount point in build chroots */
if (path_is_mount_point("/run", NULL, AT_SYMLINK_FOLLOW) > 0)
assert_se(path_is_temporary_fs("/run") > 0);
assert_se(path_is_temporary_fs("/proc") == 0);
assert_se(path_is_temporary_fs("/i-dont-exist") == -ENOENT);
}
TEST(path_is_read_only_fs) {
int r;
FOREACH_STRING(s, "/", "/run", "/sys", "/sys/", "/proc", "/i-dont-exist", "/var", "/var/lib") {
r = path_is_read_only_fs(s);
log_info_errno(r, "path_is_read_only_fs(\"%s\"): %d, %s",
s, r, r < 0 ? errno_to_name(r) : yes_no(r));
}
if (path_is_mount_point("/sys", NULL, AT_SYMLINK_FOLLOW) > 0)
assert_se(IN_SET(path_is_read_only_fs("/sys"), 0, 1));
assert_se(path_is_read_only_fs("/proc") == 0);
assert_se(path_is_read_only_fs("/i-dont-exist") == -ENOENT);
}
TEST(fd_is_ns) {
_cleanup_close_ int fd = -1;
assert_se(fd_is_ns(STDIN_FILENO, CLONE_NEWNET) == 0);
assert_se(fd_is_ns(STDERR_FILENO, CLONE_NEWNET) == 0);
assert_se(fd_is_ns(STDOUT_FILENO, CLONE_NEWNET) == 0);
fd = open("/proc/self/ns/mnt", O_CLOEXEC|O_RDONLY);
if (fd < 0) {
assert_se(errno == ENOENT);
log_notice("Path %s not found, skipping test", "/proc/self/ns/mnt");
return;
}
assert_se(fd >= 0);
assert_se(IN_SET(fd_is_ns(fd, CLONE_NEWNET), 0, -EUCLEAN));
fd = safe_close(fd);
assert_se((fd = open("/proc/self/ns/ipc", O_CLOEXEC|O_RDONLY)) >= 0);
assert_se(IN_SET(fd_is_ns(fd, CLONE_NEWIPC), 1, -EUCLEAN));
fd = safe_close(fd);
assert_se((fd = open("/proc/self/ns/net", O_CLOEXEC|O_RDONLY)) >= 0);
assert_se(IN_SET(fd_is_ns(fd, CLONE_NEWNET), 1, -EUCLEAN));
}
TEST(device_major_minor_valid) {
/* on glibc dev_t is 64bit, even though in the kernel it is only 32bit */
assert_cc(sizeof(dev_t) == sizeof(uint64_t));
assert_se(DEVICE_MAJOR_VALID(0U));
assert_se(DEVICE_MINOR_VALID(0U));
assert_se(DEVICE_MAJOR_VALID(1U));
assert_se(DEVICE_MINOR_VALID(1U));
assert_se(!DEVICE_MAJOR_VALID(-1U));
assert_se(!DEVICE_MINOR_VALID(-1U));
assert_se(DEVICE_MAJOR_VALID(1U << 10));
assert_se(DEVICE_MINOR_VALID(1U << 10));
assert_se(DEVICE_MAJOR_VALID((1U << 12) - 1));
assert_se(DEVICE_MINOR_VALID((1U << 20) - 1));
assert_se(!DEVICE_MAJOR_VALID((1U << 12)));
assert_se(!DEVICE_MINOR_VALID((1U << 20)));
assert_se(!DEVICE_MAJOR_VALID(1U << 25));
assert_se(!DEVICE_MINOR_VALID(1U << 25));
assert_se(!DEVICE_MAJOR_VALID(UINT32_MAX));
assert_se(!DEVICE_MINOR_VALID(UINT32_MAX));
assert_se(!DEVICE_MAJOR_VALID(UINT64_MAX));
assert_se(!DEVICE_MINOR_VALID(UINT64_MAX));
assert_se(DEVICE_MAJOR_VALID(major(0)));
assert_se(DEVICE_MINOR_VALID(minor(0)));
}
static void test_device_path_make_canonical_one(const char *path) {
_cleanup_free_ char *resolved = NULL, *raw = NULL;
struct stat st;
dev_t devno;
mode_t mode;
int r;
log_debug("> %s", path);
if (stat(path, &st) < 0) {
assert_se(errno == ENOENT);
log_notice("Path %s not found, skipping test", path);
return;
}
r = device_path_make_canonical(st.st_mode, st.st_rdev, &resolved);
if (r == -ENOENT) {
/* maybe /dev/char/x:y and /dev/block/x:y are missing in this test environment, because we
* run in a container or so? */
log_notice("Device %s cannot be resolved, skipping test", path);
return;
}
assert_se(r >= 0);
assert_se(path_equal(path, resolved));
assert_se(device_path_make_major_minor(st.st_mode, st.st_rdev, &raw) >= 0);
assert_se(device_path_parse_major_minor(raw, &mode, &devno) >= 0);
assert_se(st.st_rdev == devno);
assert_se((st.st_mode & S_IFMT) == (mode & S_IFMT));
}
TEST(device_path_make_canonical) {
test_device_path_make_canonical_one("/dev/null");
test_device_path_make_canonical_one("/dev/zero");
test_device_path_make_canonical_one("/dev/full");
test_device_path_make_canonical_one("/dev/random");
test_device_path_make_canonical_one("/dev/urandom");
test_device_path_make_canonical_one("/dev/tty");
if (is_device_node("/run/systemd/inaccessible/blk") > 0) {
test_device_path_make_canonical_one("/run/systemd/inaccessible/chr");
test_device_path_make_canonical_one("/run/systemd/inaccessible/blk");
}
}
TEST(dir_is_empty) {
_cleanup_(rm_rf_physical_and_freep) char *empty_dir = NULL;
_cleanup_free_ char *j = NULL, *jj = NULL;
assert_se(dir_is_empty_at(AT_FDCWD, "/proc") == 0);
assert_se(dir_is_empty_at(AT_FDCWD, "/icertainlydontexistdoi") == -ENOENT);
assert_se(mkdtemp_malloc("/tmp/emptyXXXXXX", &empty_dir) >= 0);
assert_se(dir_is_empty_at(AT_FDCWD, empty_dir) > 0);
j = path_join(empty_dir, "zzz");
assert_se(j);
assert_se(touch(j) >= 0);
assert_se(dir_is_empty_at(AT_FDCWD, empty_dir) == 0);
jj = path_join(empty_dir, "ppp");
assert_se(jj);
assert_se(touch(jj) >= 0);
assert_se(dir_is_empty_at(AT_FDCWD, empty_dir) == 0);
assert_se(unlink(j) >= 0);
assert_se(dir_is_empty_at(AT_FDCWD, empty_dir) == 0);
assert_se(unlink(jj) >= 0);
assert_se(dir_is_empty_at(AT_FDCWD, empty_dir) > 0);
}
static int intro(void) {
log_show_color(true);
return EXIT_SUCCESS;
}
DEFINE_TEST_MAIN_WITH_INTRO(LOG_INFO, intro);
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