grp/tst-putgrent.c

   1 /* Test for processing of invalid group entries.  [BZ #18724]
   2    Copyright (C) 2015-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <grp.h>
  21 #include <stdbool.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 static bool errors;
  27
  28 static void
  29 check (struct group e, const char *expected)
  30 {
  31   char *buf;
  32   size_t buf_size;
  33   FILE *f = open_memstream (&buf, &buf_size);
  34
  35   if (f == NULL)
  36     {
  37       printf ("open_memstream: %m\n");
  38       errors = true;
  39       return;
  40     }
  41
  42   int ret = putgrent (&e, f);
  43
  44   if (expected == NULL)
  45     {
  46       if (ret == -1)
  47         {
  48           if (errno != EINVAL)
  49             {
  50               printf ("putgrent: unexpected error code: %m\n");
  51               errors = true;
  52             }
  53         }
  54       else
  55         {
  56           printf ("putgrent: unexpected success (\"%s\", \"%s\")\n",
  57                   e.gr_name, e.gr_passwd);
  58           errors = true;
  59         }
  60     }
  61   else
  62     {
  63       /* Expect success.  */
  64       size_t expected_length = strlen (expected);
  65       if (ret == 0)
  66         {
  67           long written = ftell (f);
  68
  69           if (written <= 0 || fflush (f) < 0)
  70             {
  71               printf ("stream error: %m\n");
  72               errors = true;
  73             }
  74           else if (buf[written - 1] != '\n')
  75             {
  76               printf ("FAILED: \"%s\" without newline\n", expected);
  77               errors = true;
  78             }
  79           else if (strncmp (buf, expected, written - 1) != 0
  80                    || written - 1 != expected_length)
  81             {
  82               buf[written - 1] = '\0';
  83               printf ("FAILED: \"%s\" (%ld), expected \"%s\" (%zu)\n",
  84                       buf, written - 1, expected, expected_length);
  85               errors = true;
  86             }
  87         }
  88       else
  89         {
  90           printf ("FAILED: putgrent (expected \"%s\"): %m\n", expected);
  91           errors = true;
  92         }
  93     }
  94
  95   fclose (f);
  96   free (buf);
  97 }
  98
  99 static int
 100 do_test (void)
 101 {
 102   check ((struct group) {
 103       .gr_name = (char *) "root",
 104     },
 105     "root::0:");
 106   check ((struct group) {
 107       .gr_name = (char *) "root",
 108       .gr_passwd = (char *) "password",
 109       .gr_gid = 1234,
 110       .gr_mem = (char *[2]) {(char *) "member1", NULL}
 111     },
 112     "root:password:1234:member1");
 113   check ((struct group) {
 114       .gr_name = (char *) "root",
 115       .gr_passwd = (char *) "password",
 116       .gr_gid = 1234,
 117       .gr_mem = (char *[3]) {(char *) "member1", (char *) "member2", NULL}
 118     },
 119     "root:password:1234:member1,member2");
 120
 121   /* Bad values.  */
 122   {
 123     static const char *const bad_strings[] = {
 124       ":",
 125       "\n",
 126       ":bad",
 127       "\nbad",
 128       "b:ad",
 129       "b\nad",
 130       "bad:",
 131       "bad\n",
 132       "b:a\nd"
 133       ",",
 134       "\n,",
 135       ":,",
 136       ",bad",
 137       "b,ad",
 138       "bad,",
 139       NULL
 140     };
 141     for (const char *const *bad = bad_strings; *bad != NULL; ++bad)
 142       {
 143         char *members[]
 144           = {(char *) "first", (char *) *bad, (char *) "last", NULL};
 145         if (strpbrk (*bad, ":\n") != NULL)
 146           {
 147             check ((struct group) {
 148                 .gr_name = (char *) *bad,
 149               }, NULL);
 150             check ((struct group) {
 151                 .gr_name = (char *) "root",
 152                 .gr_passwd = (char *) *bad,
 153               }, NULL);
 154           }
 155         check ((struct group) {
 156             .gr_name = (char *) "root",
 157             .gr_passwd = (char *) "password",
 158             .gr_mem = members,
 159           }, NULL);
 160       }
 161   }
 162
 163   return errors;
 164 }
 165
 166 #define TEST_FUNCTION do_test ()
 167 #include "../test-skeleton.c"