pwd/tst-getpw.c

   1 /* Copyright (C) 1999-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19 #include <pwd.h>
  20 #include <errno.h>
  21 #include <stdbool.h>
  22
  23 /* We want to test getpw by calling it with a uid that does
  24    exist and one that doesn't exist. We track if we've met those
  25    conditions and exit. We also track if we've failed due to lack
  26    of memory. That constitutes all of the standard failure cases.  */
  27 bool seen_hit;
  28 bool seen_miss;
  29 bool seen_oom;
  30
  31 /* How many errors we've had while running the test.  */
  32 int errors;
  33
  34 static void
  35 check (uid_t uid)
  36 {
  37   int ret;
  38   char buf[1024];
  39
  40   ret = getpw (uid, buf);
  41
  42   /* Successfully read a password line.  */
  43   if (ret == 0 && !seen_hit)
  44     {
  45       printf ("PASS: Read a password line given a uid.\n");
  46       seen_hit = true;
  47     }
  48
  49   /* Failed to read a password line. Why?  */
  50   if (ret == -1)
  51     {
  52       /* No entry?  Technically the errno could be any number
  53          of values including ESRCH, EBADP or EPERM depending
  54          on the quality of the nss module that implements the
  55          underlying lookup. It should be 0 for getpw.*/
  56       if (errno == 0 && !seen_miss)
  57         {
  58           printf ("PASS: Found an invalid uid.\n");
  59           seen_miss = true;
  60           return;
  61         }
  62
  63       /* Out of memory?  */
  64       if (errno == ENOMEM && !seen_oom)
  65         {
  66           printf ("FAIL: Failed with ENOMEM.\n");
  67           seen_oom = true;
  68           errors++;
  69         }
  70
  71       /* We don't expect any other values for errno.  */
  72       if (errno != ENOMEM && errno != 0)
  73         errors++;
  74     }
  75 }
  76
  77 static int
  78 do_test (void)
  79 {
  80   int ret;
  81   uid_t uid;
  82
  83   /* Should return -1 and set errnot to EINVAL.  */
  84   ret = getpw (0, NULL);
  85   if (ret == -1 && errno == EINVAL)
  86     {
  87       printf ("PASS: NULL buffer returns -1 and sets errno to EINVAL.\n");
  88     }
  89   else
  90     {
  91       printf ("FAIL: NULL buffer did not return -1 or set errno to EINVAL.\n");
  92       errors++;
  93     }
  94
  95   /* Look for one matching uid, one non-found uid and then stop.
  96      Set an upper limit at the 16-bit UID mark; no need to go farther.  */
  97   for (uid = 0; uid < ((uid_t) 65535); ++uid)
  98     {
  99       check (uid);
 100       if (seen_miss && seen_hit)
 101         break;
 102     }
 103
 104   if (!seen_hit)
 105     printf ("FAIL: Did not read even one password line given a uid.\n");
 106
 107   if (!seen_miss)
 108     printf ("FAIL: Did not find even one invalid uid.\n");
 109
 110   return errors;
 111 }
 112
 113 #define TEST_FUNCTION do_test ()
 114 #include "../test-skeleton.c"