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/* Exercise low-level query functions with different QTYPEs.
Copyright (C) 2016-2021 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 <string.h>
#include <support/check.h>
#include <support/check_nss.h>
#include <support/resolv_test.h>
#include <support/support.h>
#include <support/test-driver.h>
#include <support/xmemstream.h>
/* If ture, the response function will send the actual response packet
over TCP instead of UDP. */
static volatile bool force_tcp;
/* Send back a fake resource record matching the QTYPE. */
static void
response (const struct resolv_response_context *ctx,
struct resolv_response_builder *b,
const char *qname, uint16_t qclass, uint16_t qtype)
{
if (force_tcp && ctx->tcp)
{
resolv_response_init (b, (struct resolv_response_flags) { .tc = 1 });
resolv_response_add_question (b, qname, qclass, qtype);
return;
}
resolv_response_init (b, (struct resolv_response_flags) { });
resolv_response_add_question (b, qname, qclass, qtype);
resolv_response_section (b, ns_s_an);
resolv_response_open_record (b, qname, qclass, qtype, 0);
resolv_response_add_data (b, &qtype, sizeof (qtype));
resolv_response_close_record (b);
}
static const char domain[] = "www.example.com";
static int
wrap_res_query (int type, unsigned char *answer, int answer_length)
{
return res_query (domain, C_IN, type, answer, answer_length);
}
static int
wrap_res_search (int type, unsigned char *answer, int answer_length)
{
return res_query (domain, C_IN, type, answer, answer_length);
}
static int
wrap_res_querydomain (int type, unsigned char *answer, int answer_length)
{
return res_querydomain ("www", "example.com", C_IN, type,
answer, answer_length);
}
static int
wrap_res_send (int type, unsigned char *answer, int answer_length)
{
unsigned char buf[512];
int ret = res_mkquery (QUERY, domain, C_IN, type,
(const unsigned char *) "", 0, NULL,
buf, sizeof (buf));
if (type < 0 || type >= 65536)
{
/* res_mkquery fails for out-of-range record types. */
TEST_VERIFY_EXIT (ret == -1);
return -1;
}
TEST_VERIFY_EXIT (ret > 12); /* DNS header length. */
return res_send (buf, ret, answer, answer_length);
}
static int
wrap_res_nquery (int type, unsigned char *answer, int answer_length)
{
return res_nquery (&_res, domain, C_IN, type, answer, answer_length);
}
static int
wrap_res_nsearch (int type, unsigned char *answer, int answer_length)
{
return res_nquery (&_res, domain, C_IN, type, answer, answer_length);
}
static int
wrap_res_nquerydomain (int type, unsigned char *answer, int answer_length)
{
return res_nquerydomain (&_res, "www", "example.com", C_IN, type,
answer, answer_length);
}
static int
wrap_res_nsend (int type, unsigned char *answer, int answer_length)
{
unsigned char buf[512];
int ret = res_nmkquery (&_res, QUERY, domain, C_IN, type,
(const unsigned char *) "", 0, NULL,
buf, sizeof (buf));
if (type < 0 || type >= 65536)
{
/* res_mkquery fails for out-of-range record types. */
TEST_VERIFY_EXIT (ret == -1);
return -1;
}
TEST_VERIFY_EXIT (ret > 12); /* DNS header length. */
return res_nsend (&_res, buf, ret, answer, answer_length);
}
static void
test_function (const char *fname,
int (*func) (int type,
unsigned char *answer, int answer_length))
{
unsigned char buf[512];
for (int tcp = 0; tcp < 2; ++tcp)
{
force_tcp = tcp;
for (unsigned int type = 1; type <= 65535; ++type)
{
if (test_verbose)
printf ("info: sending QTYPE %d with %s (tcp=%d)\n",
type, fname, tcp);
int ret = func (type, buf, sizeof (buf));
if (ret != 47)
FAIL_EXIT1 ("%s tcp=%d qtype=%d return value %d",
fname,tcp, type, ret);
/* One question, one answer record. */
TEST_VERIFY (memcmp (buf + 4, "\0\1\0\1\0\0\0\0", 8) == 0);
/* Question section. */
static const char qname[] = "\3www\7example\3com";
size_t qname_length = sizeof (qname);
TEST_VERIFY (memcmp (buf + 12, qname, qname_length) == 0);
/* RDATA part of answer. */
uint16_t type16 = type;
TEST_VERIFY (memcmp (buf + ret - 2, &type16, sizeof (type16)) == 0);
}
}
TEST_VERIFY (func (-1, buf, sizeof (buf) == -1));
TEST_VERIFY (func (65536, buf, sizeof (buf) == -1));
}
static int
do_test (void)
{
struct resolv_redirect_config config =
{
.response_callback = response,
};
struct resolv_test *obj = resolv_test_start (config);
test_function ("res_query", &wrap_res_query);
test_function ("res_search", &wrap_res_search);
test_function ("res_querydomain", &wrap_res_querydomain);
test_function ("res_send", &wrap_res_send);
test_function ("res_nquery", &wrap_res_nquery);
test_function ("res_nsearch", &wrap_res_nsearch);
test_function ("res_nquerydomain", &wrap_res_nquerydomain);
test_function ("res_nsend", &wrap_res_nsend);
resolv_test_end (obj);
return 0;
}
#define TIMEOUT 300
#include <support/test-driver.c>
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