posix/bug-glob2.c

   1 /* Test glob memory management.
   2    for the filesystem access functions.
   3    Copyright (C) 2001-2023 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #include <error.h>
  22 #include <dirent.h>
  23 #include <glob.h>
  24 #include <mcheck.h>
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <sys/stat.h>
  29
  30 // #define DEBUG
  31 #ifdef DEBUG
  32 # define PRINTF(fmt, args...) \
  33   do                                    \
  34     {                                   \
  35       int save_errno = errno;           \
  36       printf (fmt, ##args);             \
  37       errno = save_errno;               \
  38     } while (0)
  39 #else
  40 # define PRINTF(fmt, args...)
  41 #endif
  42
  43 #define LONG_NAME \
  44   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  45   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  46   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  47   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  48   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  49   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  50   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  51   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  52   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  53   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
  54
  55 static struct
  56 {
  57   const char *name;
  58   int level;
  59   int type;
  60   mode_t mode;
  61 } filesystem[] =
  62 {
  63   { ".", 1, DT_DIR, 0755 },
  64   { "..", 1, DT_DIR, 0755 },
  65   { "dir", 1, DT_DIR, 0755 },
  66     { ".", 2, DT_DIR, 0755 },
  67     { "..", 2, DT_DIR, 0755 },
  68     { "readable", 2, DT_DIR, 0755 },
  69       { ".", 3, DT_DIR, 0755 },
  70       { "..", 3, DT_DIR, 0755 },
  71       { "a", 3, DT_REG, 0644 },
  72       { LONG_NAME, 3, DT_REG, 0644 },
  73     { "unreadable", 2, DT_DIR, 0111 },
  74       { ".", 3, DT_DIR, 0111 },
  75       { "..", 3, DT_DIR, 0755 },
  76       { "a", 3, DT_REG, 0644 },
  77     { "zz-readable", 2, DT_DIR, 0755 },
  78       { ".", 3, DT_DIR, 0755 },
  79       { "..", 3, DT_DIR, 0755 },
  80       { "a", 3, DT_REG, 0644 }
  81 };
  82 #define nfiles (sizeof (filesystem) / sizeof (filesystem[0]))
  83
  84
  85 typedef struct
  86 {
  87   int level;
  88   int idx;
  89   struct dirent d;
  90   char room_for_dirent[sizeof (LONG_NAME)];
  91 } my_DIR;
  92
  93
  94 static long int
  95 find_file (const char *s)
  96 {
  97   int level = 1;
  98   long int idx = 0;
  99
 100   if (strcmp (s, ".") == 0)
 101     return 0;
 102
 103   if (s[0] == '.' && s[1] == '/')
 104     s += 2;
 105
 106   while (*s != '\0')
 107     {
 108       char *endp = strchrnul (s, '/');
 109
 110       PRINTF ("looking for %.*s, level %d\n", (int) (endp - s), s, level);
 111
 112       while (idx < nfiles && filesystem[idx].level >= level)
 113         {
 114           if (filesystem[idx].level == level
 115               && memcmp (s, filesystem[idx].name, endp - s) == 0
 116               && filesystem[idx].name[endp - s] == '\0')
 117             break;
 118           ++idx;
 119         }
 120
 121       if (idx == nfiles || filesystem[idx].level < level)
 122         {
 123           errno = ENOENT;
 124           return -1;
 125         }
 126
 127       if (*endp == '\0')
 128         return idx + 1;
 129
 130       if (filesystem[idx].type != DT_DIR
 131           && (idx + 1 >= nfiles
 132               || filesystem[idx].level >= filesystem[idx + 1].level))
 133         {
 134           errno = ENOTDIR;
 135           return -1;
 136         }
 137
 138       ++idx;
 139
 140       s = endp + 1;
 141       ++level;
 142     }
 143
 144   errno = ENOENT;
 145   return -1;
 146 }
 147
 148
 149 static void *
 150 my_opendir (const char *s)
 151 {
 152   long int idx = find_file (s);
 153   my_DIR *dir;
 154
 155   if (idx == -1)
 156     {
 157       PRINTF ("my_opendir(\"%s\") == NULL (%m)\n", s);
 158       return NULL;
 159     }
 160
 161   if ((filesystem[idx].mode & 0400) == 0)
 162     {
 163       errno = EACCES;
 164       PRINTF ("my_opendir(\"%s\") == NULL (%m)\n", s);
 165       return NULL;
 166     }
 167
 168   dir = (my_DIR *) malloc (sizeof (my_DIR));
 169   if (dir == NULL)
 170     {
 171       printf ("cannot allocate directory handle: %m\n");
 172       exit (EXIT_FAILURE);
 173     }
 174
 175   dir->level = filesystem[idx].level;
 176   dir->idx = idx;
 177
 178   PRINTF ("my_opendir(\"%s\") == { level: %d, idx: %ld }\n",
 179           s, filesystem[idx].level, idx);
 180
 181   return dir;
 182 }
 183
 184
 185 static struct dirent *
 186 my_readdir (void *gdir)
 187 {
 188   my_DIR *dir = gdir;
 189
 190   if (dir->idx == -1)
 191     {
 192       PRINTF ("my_readdir ({ level: %d, idx: %ld }) = NULL\n",
 193               dir->level, (long int) dir->idx);
 194       return NULL;
 195     }
 196
 197   while (dir->idx < nfiles && filesystem[dir->idx].level > dir->level)
 198     ++dir->idx;
 199
 200   if (dir->idx == nfiles || filesystem[dir->idx].level < dir->level)
 201     {
 202       dir->idx = -1;
 203       PRINTF ("my_readdir ({ level: %d, idx: %ld }) = NULL\n",
 204               dir->level, (long int) dir->idx);
 205       return NULL;
 206     }
 207
 208   dir->d.d_ino = 1;             /* glob should not skip this entry.  */
 209
 210   dir->d.d_type = filesystem[dir->idx].type;
 211
 212   strcpy (dir->d.d_name, filesystem[dir->idx].name);
 213
 214   PRINTF ("my_readdir ({ level: %d, idx: %ld }) = { d_ino: %ld, d_type: %d, d_name: \"%s\" }\n",
 215           dir->level, (long int) dir->idx, dir->d.d_ino, dir->d.d_type,
 216           dir->d.d_name);
 217
 218   ++dir->idx;
 219
 220   return &dir->d;
 221 }
 222
 223
 224 static void
 225 my_closedir (void *dir)
 226 {
 227   PRINTF ("my_closedir ()\n");
 228   free (dir);
 229 }
 230
 231
 232 /* We use this function for lstat as well since we don't have any.  */
 233 static int
 234 my_stat (const char *name, struct stat *st)
 235 {
 236   long int idx = find_file (name);
 237
 238   if (idx == -1)
 239     {
 240       PRINTF ("my_stat (\"%s\", ...) = -1 (%m)\n", name);
 241       return -1;
 242     }
 243
 244   memset (st, '\0', sizeof (*st));
 245
 246   if (filesystem[idx].type == DT_UNKNOWN)
 247     st->st_mode = DTTOIF (idx + 1 < nfiles
 248                           && filesystem[idx].level < filesystem[idx + 1].level
 249                           ? DT_DIR : DT_REG) | filesystem[idx].mode;
 250   else
 251     st->st_mode = DTTOIF (filesystem[idx].type) | filesystem[idx].mode;
 252
 253   PRINTF ("my_stat (\"%s\", { st_mode: %o }) = 0\n", name, st->st_mode);
 254
 255   return 0;
 256 }
 257
 258
 259 static void
 260 init_glob_altdirfuncs (glob_t *pglob)
 261 {
 262   pglob->gl_closedir = my_closedir;
 263   pglob->gl_readdir = my_readdir;
 264   pglob->gl_opendir = my_opendir;
 265   pglob->gl_lstat = my_stat;
 266   pglob->gl_stat = my_stat;
 267 }
 268
 269
 270 int
 271 do_test (void)
 272 {
 273   mtrace ();
 274
 275   glob_t gl;
 276   memset (&gl, 0, sizeof (gl));
 277   init_glob_altdirfuncs (&gl);
 278
 279   if (glob ("dir/*able/*", GLOB_ERR | GLOB_ALTDIRFUNC, NULL, &gl)
 280       != GLOB_ABORTED)
 281     {
 282       puts ("glob did not fail with GLOB_ABORTED");
 283       exit (EXIT_FAILURE);
 284     }
 285
 286   globfree (&gl);
 287
 288   memset (&gl, 0, sizeof (gl));
 289   init_glob_altdirfuncs (&gl);
 290
 291   gl.gl_offs = 3;
 292   if (glob ("dir2/*", GLOB_DOOFFS, NULL, &gl) != GLOB_NOMATCH)
 293     {
 294       puts ("glob did not fail with GLOB_NOMATCH");
 295       exit (EXIT_FAILURE);
 296     }
 297
 298   globfree (&gl);
 299
 300   muntrace ();
 301
 302   return 0;
 303 }
 304
 305 #define TEST_FUNCTION do_test ()
 306 #include "../test-skeleton.c"