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resolv: Add the __ns_samebinaryname function

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During packet parsing, only the binary name is available.  If the name
equality check is performed before conversion to text, we can sometimes
skip the last step.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Florian Weimer
2022-08-30 10:02:49 +02:00
parent c79327bf00
commit 394085a34d
4 changed files with 128 additions and 0 deletions
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62
resolv/tst-ns_samebinaryname.c Normal file
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/* Test the __ns_samebinaryname function.
Copyright (C) 2022 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 <arpa/nameser.h>
#include <array_length.h>
#include <stdbool.h>
#include <stdio.h>
#include <support/check.h>
/* First character denotes the comparison group: All names with the
same first character are expected to compare equal. */
static const char *const cases[] =
{
" ",
"1\001a", "1\001A",
"2\002ab", "2\002aB", "2\002Ab", "2\002AB",
"3\001a\002ab", "3\001A\002ab",
"w\003www\007example\003com", "w\003Www\007Example\003Com",
"w\003WWW\007EXAMPLE\003COM",
"W\003WWW", "W\003www",
};
static int
do_test (void)
{
for (int i = 0; i < array_length (cases); ++i)
for (int j = 0; j < array_length (cases); ++j)
{
unsigned char *a = (unsigned char *) &cases[i][1];
unsigned char *b = (unsigned char *) &cases[j][1];
bool actual = __ns_samebinaryname (a, b);
bool expected = cases[i][0] == cases[j][0];
if (actual != expected)
{
char a1[NS_MAXDNAME];
TEST_VERIFY (ns_name_ntop (a, a1, sizeof (a1)) > 0);
char b1[NS_MAXDNAME];
TEST_VERIFY (ns_name_ntop (b, b1, sizeof (b1)) > 0);
printf ("error: \"%s\" \"%s\": expected %s\n",
a1, b1, expected ? "equal" : "unqueal");
support_record_failure ();
}
}
return 0;
}
#include <support/test-driver.c>