maint/gnulib/tests/test-canonicalize-lgpl.c

/* */
This source file includes following definitions.
main
   1 /* Test of execution of file name canonicalization.
   2    Copyright (C) 2007-2021 Free Software Foundation, Inc.
   3 
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8 
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13 
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16 
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18 
  19 /* Don't use __attribute__ __nonnull__ in this compilation unit.  Otherwise gcc
  20    may "optimize" the null_ptr function, when its result gets passed to a
  21    function that has an argument declared as _GL_ARG_NONNULL.  */
  22 #define _GL_ARG_NONNULL(params)
  23 
  24 #include <config.h>
  25 
  26 #include <stdlib.h>
  27 
  28 #include "signature.h"
  29 SIGNATURE_CHECK (realpath, char *, (const char *, char *));
  30 SIGNATURE_CHECK (canonicalize_file_name, char *, (const char *));
  31 
  32 #include <errno.h>
  33 #include <fcntl.h>
  34 #include <stdio.h>
  35 #include <string.h>
  36 #include <sys/stat.h>
  37 #include <unistd.h>
  38 
  39 #include "same-inode.h"
  40 #include "ignore-value.h"
  41 
  42 #if GNULIB_defined_canonicalize_file_name
  43 # include "null-ptr.h"
  44 #endif
  45 
  46 #include "macros.h"
  47 
  48 #define BASE "t-can-lgpl.tmp"
  49 
  50 int
  51 main (void)
     /*  */
  52 {
  53 #if GNULIB_TEST_CANONICALIZE
  54   /* No need to test canonicalize-lgpl module if canonicalize is also
  55      in use.  */
  56   return 0;
  57 #endif
  58 
  59   /* Setup some hierarchy to be used by this test.  Start by removing
  60      any leftovers from a previous partial run.  */
  61   {
  62     int fd;
  63     ignore_value (system ("rm -rf " BASE " ise"));
  64     ASSERT (mkdir (BASE, 0700) == 0);
  65     fd = creat (BASE "/tra", 0600);
  66     ASSERT (0 <= fd);
  67     ASSERT (close (fd) == 0);
  68   }
  69 
  70   /* Check // handling (the easy cases, without symlinks).
  71      This // handling is not mandated by POSIX.  However, many applications
  72      expect that canonicalize_file_name "canonicalizes" the file name,
  73      that is, that different results of canonicalize_file_name correspond
  74      to different files (except for hard links).  */
  75   {
  76     char *result0 = canonicalize_file_name ("/etc/passwd");
  77     if (result0 != NULL) /* This file does not exist on native Windows.  */
  78       {
  79         char *result;
  80 
  81         result = canonicalize_file_name ("/etc//passwd");
  82         ASSERT (result != NULL && strcmp (result, result0) == 0);
  83 
  84         result = canonicalize_file_name ("/etc///passwd");
  85         ASSERT (result != NULL && strcmp (result, result0) == 0);
  86 
  87         /* On Windows, the syntax //host/share/filename denotes a file
  88            in a directory named 'share', exported from host 'host'.
  89            See also m4/double-slash-root.m4.  */
  90 #if !(defined _WIN32 || defined __CYGWIN__)
  91         result = canonicalize_file_name ("//etc/passwd");
  92         ASSERT (result != NULL && strcmp (result, result0) == 0);
  93 
  94         result = canonicalize_file_name ("//etc//passwd");
  95         ASSERT (result != NULL && strcmp (result, result0) == 0);
  96 
  97         result = canonicalize_file_name ("//etc///passwd");
  98         ASSERT (result != NULL && strcmp (result, result0) == 0);
  99 #endif
 100 
 101         result = canonicalize_file_name ("///etc/passwd");
 102         ASSERT (result != NULL && strcmp (result, result0) == 0);
 103 
 104         result = canonicalize_file_name ("///etc//passwd");
 105         ASSERT (result != NULL && strcmp (result, result0) == 0);
 106 
 107         result = canonicalize_file_name ("///etc///passwd");
 108         ASSERT (result != NULL && strcmp (result, result0) == 0);
 109       }
 110   }
 111 
 112   /* Check for ., .., intermediate // handling, and for error cases.  */
 113   {
 114     char *result = canonicalize_file_name (BASE "//./..//" BASE "/tra");
 115     ASSERT (result != NULL);
 116     ASSERT (strstr (result, "/" BASE "/tra")
 117             == result + strlen (result) - strlen ("/" BASE "/tra"));
 118     free (result);
 119 
 120     errno = 0;
 121     result = canonicalize_file_name ("");
 122     ASSERT (result == NULL);
 123     ASSERT (errno == ENOENT);
 124 
 125     /* This test works only if the canonicalize_file_name implementation
 126        comes from gnulib.  If it comes from libc, we have no way to prevent
 127        gcc from "optimizing" the null_ptr function in invalid ways.  See
 128        <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93156>.  */
 129 #if GNULIB_defined_canonicalize_file_name
 130     errno = 0;
 131     result = canonicalize_file_name (null_ptr ());
 132     ASSERT (result == NULL);
 133     ASSERT (errno == EINVAL);
 134 #endif
 135   }
 136 
 137   /* Check that a non-directory with trailing slash yields NULL.  */
 138   {
 139     char *result;
 140     errno = 0;
 141     result = canonicalize_file_name (BASE "/tra/");
 142     ASSERT (result == NULL);
 143     ASSERT (errno == ENOTDIR);
 144   }
 145 
 146   /* Check that a missing directory yields NULL.  */
 147   {
 148     char *result;
 149     errno = 0;
 150     result = canonicalize_file_name (BASE "/zzz/..");
 151     ASSERT (result == NULL);
 152     ASSERT (errno == ENOENT);
 153   }
 154 
 155   /* From here on out, tests involve symlinks.  */
 156   if (symlink (BASE "/ket", "ise") != 0)
 157     {
 158       ASSERT (remove (BASE "/tra") == 0);
 159       ASSERT (rmdir (BASE) == 0);
 160       fputs ("skipping test: symlinks not supported on this file system\n",
 161              stderr);
 162       return 77;
 163     }
 164   ASSERT (symlink ("bef", BASE "/plo") == 0);
 165   ASSERT (symlink ("tra", BASE "/huk") == 0);
 166   ASSERT (symlink ("lum", BASE "/bef") == 0);
 167   ASSERT (symlink ("wum", BASE "/ouk") == 0);
 168   ASSERT (symlink ("../ise", BASE "/ket") == 0);
 169   ASSERT (mkdir (BASE "/lum", 0700) == 0);
 170   ASSERT (symlink ("//.//../..", BASE "/droot") == 0);
 171 
 172   /* Check that the symbolic link to a file can be resolved.  */
 173   {
 174     char *result1 = canonicalize_file_name (BASE "/huk");
 175     char *result2 = canonicalize_file_name (BASE "/tra");
 176     ASSERT (result1 != NULL);
 177     ASSERT (result2 != NULL);
 178     ASSERT (strcmp (result1, result2) == 0);
 179     ASSERT (strcmp (result1 + strlen (result1) - strlen ("/" BASE "/tra"),
 180                     "/" BASE "/tra") == 0);
 181     free (result1);
 182     free (result2);
 183   }
 184 
 185   /* Check that the symbolic link to a directory can be resolved.  */
 186   {
 187     char *result1 = canonicalize_file_name (BASE "/plo");
 188     char *result2 = canonicalize_file_name (BASE "/bef");
 189     char *result3 = canonicalize_file_name (BASE "/lum");
 190     ASSERT (result1 != NULL);
 191     ASSERT (result2 != NULL);
 192     ASSERT (result3 != NULL);
 193     ASSERT (strcmp (result1, result2) == 0);
 194     ASSERT (strcmp (result2, result3) == 0);
 195     ASSERT (strcmp (result1 + strlen (result1) - strlen ("/" BASE "/lum"),
 196                     "/" BASE "/lum") == 0);
 197     free (result1);
 198     free (result2);
 199     free (result3);
 200   }
 201 
 202   /* Check that a symbolic link to a nonexistent file yields NULL.  */
 203   {
 204     char *result;
 205     errno = 0;
 206     result = canonicalize_file_name (BASE "/ouk");
 207     ASSERT (result == NULL);
 208     ASSERT (errno == ENOENT);
 209   }
 210 
 211   /* Check that a non-directory symlink with trailing slash yields NULL,
 212      and likewise for other troublesome suffixes.  */
 213   {
 214     char const *const file_name[]
 215       = {
 216          BASE "/huk/",
 217          BASE "/huk/.",
 218          BASE "/huk/./",
 219          BASE "/huk/./.",
 220          BASE "/huk/x",
 221          BASE "/huk/..",
 222          BASE "/huk/../",
 223          BASE "/huk/../.",
 224          BASE "/huk/../x",
 225          BASE "/huk/./..",
 226          BASE "/huk/././../x",
 227         };
 228     for (int i = 0; i < sizeof file_name / sizeof *file_name; i++)
 229       {
 230         errno = 0;
 231         ASSERT (!canonicalize_file_name (file_name[i]));
 232         ASSERT (errno == ENOTDIR);
 233       }
 234   }
 235 
 236   /* Check that a missing directory via symlink yields NULL.  */
 237   {
 238     char *result;
 239     errno = 0;
 240     result = canonicalize_file_name (BASE "/ouk/..");
 241     ASSERT (result == NULL);
 242     ASSERT (errno == ENOENT);
 243   }
 244 
 245   /* Check that a loop of symbolic links is detected.  */
 246   {
 247     char *result;
 248     errno = 0;
 249     result = canonicalize_file_name ("ise");
 250     ASSERT (result == NULL);
 251     ASSERT (errno == ELOOP);
 252   }
 253 
 254   /* Check that leading // within symlinks is honored correctly.  */
 255   {
 256     struct stat st1;
 257     struct stat st2;
 258     char *result1 = canonicalize_file_name ("//.");
 259     char *result2 = canonicalize_file_name (BASE "/droot");
 260     ASSERT (result1);
 261     ASSERT (result2);
 262     ASSERT (stat ("/", &st1) == 0);
 263     ASSERT (stat ("//", &st2) == 0);
 264     /* On IBM z/OS, "/" and "//" are distinct, yet they both have
 265        st_dev == st_ino == 1.  */
 266 #ifndef __MVS__
 267     if (SAME_INODE (st1, st2))
 268       {
 269         ASSERT (strcmp (result1, "/") == 0);
 270         ASSERT (strcmp (result2, "/") == 0);
 271       }
 272     else
 273 #endif
 274       {
 275         ASSERT (strcmp (result1, "//") == 0);
 276         ASSERT (strcmp (result2, "//") == 0);
 277       }
 278     free (result1);
 279     free (result2);
 280   }
 281 
 282 
 283   /* Cleanup.  */
 284   ASSERT (remove (BASE "/droot") == 0);
 285   ASSERT (remove (BASE "/plo") == 0);
 286   ASSERT (remove (BASE "/huk") == 0);
 287   ASSERT (remove (BASE "/bef") == 0);
 288   ASSERT (remove (BASE "/ouk") == 0);
 289   ASSERT (remove (BASE "/ket") == 0);
 290   ASSERT (remove (BASE "/lum") == 0);
 291   ASSERT (remove (BASE "/tra") == 0);
 292   ASSERT (remove (BASE) == 0);
 293   ASSERT (remove ("ise") == 0);
 294 
 295   return 0;
 296 }
/* */
root/maint/gnulib/tests/test-canonicalize-lgpl.c

DEFINITIONS
