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/* Test ns_name_compress corner cases.
Copyright (C) 2017-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <resolv.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
/* Check that we can process names which fit into the destination
buffer exactly. See bug 21359. */
static void
test_exact_fit (const char *name, size_t length)
{
unsigned char *buf = xmalloc (length + 1);
memset (buf, '$', length + 1);
enum { ptr_count = 5 };
const unsigned char *dnptrs[ptr_count] = { buf, };
int ret = ns_name_compress (name, buf, length,
dnptrs, dnptrs + ptr_count);
if (ret < 0)
{
support_record_failure ();
printf ("error: ns_name_compress for %s/%zu failed\n", name, length);
return;
}
if ((size_t) ret != length)
{
support_record_failure ();
printf ("error: ns_name_compress for %s/%zu result mismatch: %d\n",
name, length, ret);
}
if (buf[length] != '$')
{
support_record_failure ();
printf ("error: ns_name_compress for %s/%zu padding write\n",
name, length);
}
free (buf);
}
static int
do_test (void)
{
test_exact_fit ("abc", 5);
test_exact_fit ("abc.", 5);
{
char long_name[]
= "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa."
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa."
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa."
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.";
TEST_VERIFY (strlen (long_name) == NS_MAXCDNAME - 1);
test_exact_fit (long_name, NS_MAXCDNAME);
long_name[sizeof (long_name) - 1] = '\0';
test_exact_fit (long_name, NS_MAXCDNAME);
}
return 0;
}
#include <support/test-driver.c>
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