Line data    Source code

       1             : /* SPDX-License-Identifier: LGPL-2.1+ */
       2             : 
       3             : #include <fcntl.h>
       4             : #include <linux/magic.h>
       5             : #include <unistd.h>
       6             : 
       7             : #include "alloc-util.h"
       8             : #include "fd-util.h"
       9             : #include "macro.h"
      10             : #include "missing.h"
      11             : #include "mountpoint-util.h"
      12             : #include "namespace-util.h"
      13             : #include "path-util.h"
      14             : #include "stat-util.h"
      15             : #include "tmpfile-util.h"
      16             : 
      17           1 : static void test_files_same(void) {
      18           1 :         _cleanup_close_ int fd = -1;
      19           1 :         char name[] = "/tmp/test-files_same.XXXXXX";
      20           1 :         char name_alias[] = "/tmp/test-files_same.alias";
      21             : 
      22           1 :         fd = mkostemp_safe(name);
      23           1 :         assert_se(fd >= 0);
      24           1 :         assert_se(symlink(name, name_alias) >= 0);
      25             : 
      26           1 :         assert_se(files_same(name, name, 0));
      27           1 :         assert_se(files_same(name, name, AT_SYMLINK_NOFOLLOW));
      28           1 :         assert_se(files_same(name, name_alias, 0));
      29           1 :         assert_se(!files_same(name, name_alias, AT_SYMLINK_NOFOLLOW));
      30             : 
      31           1 :         unlink(name);
      32           1 :         unlink(name_alias);
      33           1 : }
      34             : 
      35           1 : static void test_is_symlink(void) {
      36           1 :         char name[] = "/tmp/test-is_symlink.XXXXXX";
      37           1 :         char name_link[] = "/tmp/test-is_symlink.link";
      38           1 :         _cleanup_close_ int fd = -1;
      39             : 
      40           1 :         fd = mkostemp_safe(name);
      41           1 :         assert_se(fd >= 0);
      42           1 :         assert_se(symlink(name, name_link) >= 0);
      43             : 
      44           1 :         assert_se(is_symlink(name) == 0);
      45           1 :         assert_se(is_symlink(name_link) == 1);
      46           1 :         assert_se(is_symlink("/a/file/which/does/not/exist/i/guess") < 0);
      47             : 
      48           1 :         unlink(name);
      49           1 :         unlink(name_link);
      50           1 : }
      51             : 
      52           1 : static void test_path_is_fs_type(void) {
      53             :         /* run might not be a mount point in build chroots */
      54           1 :         if (path_is_mount_point("/run", NULL, AT_SYMLINK_FOLLOW) > 0) {
      55           1 :                 assert_se(path_is_fs_type("/run", TMPFS_MAGIC) > 0);
      56           1 :                 assert_se(path_is_fs_type("/run", BTRFS_SUPER_MAGIC) == 0);
      57             :         }
      58           1 :         assert_se(path_is_fs_type("/proc", PROC_SUPER_MAGIC) > 0);
      59           1 :         assert_se(path_is_fs_type("/proc", BTRFS_SUPER_MAGIC) == 0);
      60           1 :         assert_se(path_is_fs_type("/i-dont-exist", BTRFS_SUPER_MAGIC) == -ENOENT);
      61           1 : }
      62             : 
      63           1 : static void test_path_is_temporary_fs(void) {
      64             :         /* run might not be a mount point in build chroots */
      65           1 :         if (path_is_mount_point("/run", NULL, AT_SYMLINK_FOLLOW) > 0)
      66           1 :                 assert_se(path_is_temporary_fs("/run") > 0);
      67           1 :         assert_se(path_is_temporary_fs("/proc") == 0);
      68           1 :         assert_se(path_is_temporary_fs("/i-dont-exist") == -ENOENT);
      69           1 : }
      70             : 
      71           1 : static void test_fd_is_network_ns(void) {
      72           1 :         _cleanup_close_ int fd = -1;
      73           1 :         assert_se(fd_is_network_ns(STDIN_FILENO) == 0);
      74           1 :         assert_se(fd_is_network_ns(STDERR_FILENO) == 0);
      75           1 :         assert_se(fd_is_network_ns(STDOUT_FILENO) == 0);
      76             : 
      77           1 :         assert_se((fd = open("/proc/self/ns/mnt", O_CLOEXEC|O_RDONLY)) >= 0);
      78           1 :         assert_se(IN_SET(fd_is_network_ns(fd), 0, -EUCLEAN));
      79           1 :         fd = safe_close(fd);
      80             : 
      81           1 :         assert_se((fd = open("/proc/self/ns/net", O_CLOEXEC|O_RDONLY)) >= 0);
      82           1 :         assert_se(IN_SET(fd_is_network_ns(fd), 1, -EUCLEAN));
      83           1 : }
      84             : 
      85           1 : static void test_device_major_minor_valid(void) {
      86             :         /* on glibc dev_t is 64bit, even though in the kernel it is only 32bit */
      87             :         assert_cc(sizeof(dev_t) == sizeof(uint64_t));
      88             : 
      89           1 :         assert_se(DEVICE_MAJOR_VALID(0U));
      90           1 :         assert_se(DEVICE_MINOR_VALID(0U));
      91             : 
      92           1 :         assert_se(DEVICE_MAJOR_VALID(1U));
      93           1 :         assert_se(DEVICE_MINOR_VALID(1U));
      94             : 
      95           1 :         assert_se(!DEVICE_MAJOR_VALID(-1U));
      96           1 :         assert_se(!DEVICE_MINOR_VALID(-1U));
      97             : 
      98           1 :         assert_se(DEVICE_MAJOR_VALID(1U << 10));
      99           1 :         assert_se(DEVICE_MINOR_VALID(1U << 10));
     100             : 
     101           1 :         assert_se(DEVICE_MAJOR_VALID((1U << 12) - 1));
     102           1 :         assert_se(DEVICE_MINOR_VALID((1U << 20) - 1));
     103             : 
     104           1 :         assert_se(!DEVICE_MAJOR_VALID((1U << 12)));
     105           1 :         assert_se(!DEVICE_MINOR_VALID((1U << 20)));
     106             : 
     107           1 :         assert_se(!DEVICE_MAJOR_VALID(1U << 25));
     108           1 :         assert_se(!DEVICE_MINOR_VALID(1U << 25));
     109             : 
     110           1 :         assert_se(!DEVICE_MAJOR_VALID(UINT32_MAX));
     111           1 :         assert_se(!DEVICE_MINOR_VALID(UINT32_MAX));
     112             : 
     113           1 :         assert_se(!DEVICE_MAJOR_VALID(UINT64_MAX));
     114           1 :         assert_se(!DEVICE_MINOR_VALID(UINT64_MAX));
     115             : 
     116           1 :         assert_se(DEVICE_MAJOR_VALID(major(0)));
     117           1 :         assert_se(DEVICE_MINOR_VALID(minor(0)));
     118           1 : }
     119             : 
     120           6 : static void test_device_path_make_canonical_one(const char *path) {
     121           6 :         _cleanup_free_ char *resolved = NULL, *raw = NULL;
     122             :         struct stat st;
     123             :         dev_t devno;
     124             :         mode_t mode;
     125             :         int r;
     126             : 
     127           6 :         assert_se(stat(path, &st) >= 0);
     128           6 :         r = device_path_make_canonical(st.st_mode, st.st_rdev, &resolved);
     129           6 :         if (r == -ENOENT) /* maybe /dev/char/x:y and /dev/block/x:y are missing in this test environment, because we
     130             :                            * run in a container or so? */
     131           0 :                 return;
     132             : 
     133           6 :         assert_se(r >= 0);
     134           6 :         assert_se(path_equal(path, resolved));
     135             : 
     136           6 :         assert_se(device_path_make_major_minor(st.st_mode, st.st_rdev, &raw) >= 0);
     137           6 :         assert_se(device_path_parse_major_minor(raw, &mode, &devno) >= 0);
     138             : 
     139           6 :         assert_se(st.st_rdev == devno);
     140           6 :         assert_se((st.st_mode & S_IFMT) == (mode & S_IFMT));
     141             : }
     142             : 
     143           1 : static void test_device_path_make_canonical(void) {
     144             : 
     145           1 :         test_device_path_make_canonical_one("/dev/null");
     146           1 :         test_device_path_make_canonical_one("/dev/zero");
     147           1 :         test_device_path_make_canonical_one("/dev/full");
     148           1 :         test_device_path_make_canonical_one("/dev/random");
     149           1 :         test_device_path_make_canonical_one("/dev/urandom");
     150           1 :         test_device_path_make_canonical_one("/dev/tty");
     151             : 
     152           1 :         if (is_device_node("/run/systemd/inaccessible/chr") > 0) {
     153           0 :                 test_device_path_make_canonical_one("/run/systemd/inaccessible/chr");
     154           0 :                 test_device_path_make_canonical_one("/run/systemd/inaccessible/blk");
     155             :         }
     156           1 : }
     157             : 
     158           1 : int main(int argc, char *argv[]) {
     159           1 :         test_files_same();
     160           1 :         test_is_symlink();
     161           1 :         test_path_is_fs_type();
     162           1 :         test_path_is_temporary_fs();
     163           1 :         test_fd_is_network_ns();
     164           1 :         test_device_major_minor_valid();
     165           1 :         test_device_path_make_canonical();
     166             : 
     167           1 :         return 0;
     168             : }