kc3-lang/gnulib/tests/test-canonicalize-lgpl.c

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  Date : 2023-01-01T01:14:21
  

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• tests/test-canonicalize-lgpl.c

• /* Test of execution of file name canonicalization.
     Copyright (C) 2007-2023 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
  
     This program 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 General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  
  /* Don't use __attribute__ __nonnull__ in this compilation unit.  Otherwise gcc
     may "optimize" the null_ptr function, when its result gets passed to a
     function that has an argument declared as _GL_ARG_NONNULL.  */
  #define _GL_ARG_NONNULL(params)
  
  #include <config.h>
  
  #include <stdlib.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (realpath, char *, (const char *, char *));
  SIGNATURE_CHECK (canonicalize_file_name, char *, (const char *));
  
  #include <errno.h>
  #include <fcntl.h>
  #include <stdio.h>
  #include <string.h>
  #include <sys/stat.h>
  #include <unistd.h>
  
  #include "same-inode.h"
  #include "ignore-value.h"
  
  #if GNULIB_defined_canonicalize_file_name
  # include "null-ptr.h"
  #endif
  
  #include "macros.h"
  
  #define BASE "t-can-lgpl.tmp"
  
  int
  main (void)
  {
  #if GNULIB_TEST_CANONICALIZE
    /* No need to test canonicalize-lgpl module if canonicalize is also
       in use.  */
    return 0;
  #endif
  
    /* Setup some hierarchy to be used by this test.  Start by removing
       any leftovers from a previous partial run.  */
    {
      int fd;
      ignore_value (system ("rm -rf " BASE " ise"));
      ASSERT (mkdir (BASE, 0700) == 0);
      fd = creat (BASE "/tra", 0600);
      ASSERT (0 <= fd);
      ASSERT (close (fd) == 0);
    }
  
    /* Check // handling (the easy cases, without symlinks).
       This // handling is not mandated by POSIX.  However, many applications
       expect that canonicalize_file_name "canonicalizes" the file name,
       that is, that different results of canonicalize_file_name correspond
       to different files (except for hard links).  */
    {
      char *result0 = canonicalize_file_name ("/etc/passwd");
      if (result0 != NULL) /* This file does not exist on native Windows.  */
        {
          char *result;
  
          result = canonicalize_file_name ("/etc//passwd");
          ASSERT (result != NULL && strcmp (result, result0) == 0);
  
          result = canonicalize_file_name ("/etc///passwd");
          ASSERT (result != NULL && strcmp (result, result0) == 0);
  
          /* On Windows, the syntax //host/share/filename denotes a file
             in a directory named 'share', exported from host 'host'.
             See also m4/double-slash-root.m4.  */
  #if !(defined _WIN32 || defined __CYGWIN__)
          result = canonicalize_file_name ("//etc/passwd");
          ASSERT (result != NULL && strcmp (result, result0) == 0);
  
          result = canonicalize_file_name ("//etc//passwd");
          ASSERT (result != NULL && strcmp (result, result0) == 0);
  
          result = canonicalize_file_name ("//etc///passwd");
          ASSERT (result != NULL && strcmp (result, result0) == 0);
  #endif
  
          result = canonicalize_file_name ("///etc/passwd");
          ASSERT (result != NULL && strcmp (result, result0) == 0);
  
          result = canonicalize_file_name ("///etc//passwd");
          ASSERT (result != NULL && strcmp (result, result0) == 0);
  
          result = canonicalize_file_name ("///etc///passwd");
          ASSERT (result != NULL && strcmp (result, result0) == 0);
        }
    }
  
    /* Check for ., .., intermediate // handling, and for error cases.  */
    {
      char *result = canonicalize_file_name (BASE "//./..//" BASE "/tra");
      ASSERT (result != NULL);
      ASSERT (strstr (result, "/" BASE "/tra")
              == result + strlen (result) - strlen ("/" BASE "/tra"));
      free (result);
  
      errno = 0;
      result = canonicalize_file_name ("");
      ASSERT (result == NULL);
      ASSERT (errno == ENOENT);
  
      /* This test works only if the canonicalize_file_name implementation
         comes from gnulib.  If it comes from libc, we have no way to prevent
         gcc from "optimizing" the null_ptr function in invalid ways.  See
         <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93156>.  */
  #if GNULIB_defined_canonicalize_file_name
      errno = 0;
      result = canonicalize_file_name (null_ptr ());
      ASSERT (result == NULL);
      ASSERT (errno == EINVAL);
  #endif
    }
  
    /* Check that a non-directory with trailing slash yields NULL.  */
    {
      char *result;
      errno = 0;
      result = canonicalize_file_name (BASE "/tra/");
      ASSERT (result == NULL);
      ASSERT (errno == ENOTDIR);
    }
  
    /* Check that a missing directory yields NULL.  */
    {
      char *result;
      errno = 0;
      result = canonicalize_file_name (BASE "/zzz/..");
      ASSERT (result == NULL);
      ASSERT (errno == ENOENT);
    }
  
    /* From here on out, tests involve symlinks.  */
    if (symlink (BASE "/ket", "ise") != 0)
      {
        ASSERT (remove (BASE "/tra") == 0);
        ASSERT (rmdir (BASE) == 0);
        fputs ("skipping test: symlinks not supported on this file system\n",
               stderr);
        return 77;
      }
    ASSERT (symlink ("bef", BASE "/plo") == 0);
    ASSERT (symlink ("tra", BASE "/huk") == 0);
    ASSERT (symlink ("lum", BASE "/bef") == 0);
    ASSERT (symlink ("wum", BASE "/ouk") == 0);
    ASSERT (symlink ("../ise", BASE "/ket") == 0);
    ASSERT (mkdir (BASE "/lum", 0700) == 0);
    ASSERT (symlink ("//.//../..", BASE "/droot") == 0);
  
    /* Check that the symbolic link to a file can be resolved.  */
    {
      char *result1 = canonicalize_file_name (BASE "/huk");
      char *result2 = canonicalize_file_name (BASE "/tra");
      ASSERT (result1 != NULL);
      ASSERT (result2 != NULL);
      ASSERT (strcmp (result1, result2) == 0);
      ASSERT (strcmp (result1 + strlen (result1) - strlen ("/" BASE "/tra"),
                      "/" BASE "/tra") == 0);
      free (result1);
      free (result2);
    }
  
    /* Check that the symbolic link to a directory can be resolved.  */
    {
      char *result1 = canonicalize_file_name (BASE "/plo");
      char *result2 = canonicalize_file_name (BASE "/bef");
      char *result3 = canonicalize_file_name (BASE "/lum");
      ASSERT (result1 != NULL);
      ASSERT (result2 != NULL);
      ASSERT (result3 != NULL);
      ASSERT (strcmp (result1, result2) == 0);
      ASSERT (strcmp (result2, result3) == 0);
      ASSERT (strcmp (result1 + strlen (result1) - strlen ("/" BASE "/lum"),
                      "/" BASE "/lum") == 0);
      free (result1);
      free (result2);
      free (result3);
    }
  
    /* Check that a symbolic link to a nonexistent file yields NULL.  */
    {
      char *result;
      errno = 0;
      result = canonicalize_file_name (BASE "/ouk");
      ASSERT (result == NULL);
      ASSERT (errno == ENOENT);
    }
  
    /* Check that a non-directory symlink with trailing slash yields NULL,
       and likewise for other troublesome suffixes.  */
    {
      char const *const file_name[]
        = {
           BASE "/huk/",
           BASE "/huk/.",
           BASE "/huk/./",
           BASE "/huk/./.",
           BASE "/huk/x",
           BASE "/huk/..",
           BASE "/huk/../",
           BASE "/huk/../.",
           BASE "/huk/../x",
           BASE "/huk/./..",
           BASE "/huk/././../x",
          };
      for (int i = 0; i < sizeof file_name / sizeof *file_name; i++)
        {
          errno = 0;
          ASSERT (!canonicalize_file_name (file_name[i]));
          ASSERT (errno == ENOTDIR);
        }
    }
  
    /* Check that a missing directory via symlink yields NULL.  */
    {
      char *result;
      errno = 0;
      result = canonicalize_file_name (BASE "/ouk/..");
      ASSERT (result == NULL);
      ASSERT (errno == ENOENT);
    }
  
    /* Check that a loop of symbolic links is detected.  */
    {
      char *result;
      errno = 0;
      result = canonicalize_file_name ("ise");
      ASSERT (result == NULL);
      ASSERT (errno == ELOOP);
    }
  
    /* Check that leading // within symlinks is honored correctly.  */
    {
      struct stat st1;
      struct stat st2;
      char *result1 = canonicalize_file_name ("//.");
      char *result2 = canonicalize_file_name (BASE "/droot");
      ASSERT (result1);
      ASSERT (result2);
      ASSERT (stat ("/", &st1) == 0);
      ASSERT (stat ("//", &st2) == 0);
      /* On IBM z/OS, "/" and "//" are distinct, yet they both have
         st_dev == st_ino == 1.  */
  #ifndef __MVS__
      if (SAME_INODE (st1, st2))
        {
          ASSERT (strcmp (result1, "/") == 0);
          ASSERT (strcmp (result2, "/") == 0);
        }
      else
  #endif
        {
          ASSERT (strcmp (result1, "//") == 0);
          ASSERT (strcmp (result2, "//") == 0);
        }
      free (result1);
      free (result2);
    }
  
  
    /* Cleanup.  */
    ASSERT (remove (BASE "/droot") == 0);
    ASSERT (remove (BASE "/plo") == 0);
    ASSERT (remove (BASE "/huk") == 0);
    ASSERT (remove (BASE "/bef") == 0);
    ASSERT (remove (BASE "/ouk") == 0);
    ASSERT (remove (BASE "/ket") == 0);
    ASSERT (remove (BASE "/lum") == 0);
    ASSERT (remove (BASE "/tra") == 0);
    ASSERT (remove (BASE) == 0);
    ASSERT (remove ("ise") == 0);
  
    return 0;
  }
  

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