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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#include <inttypes.h>
#include <stdbool.h>
#include <stdlib.h>
#include <isc/buffer.h>
#include <isc/commandline.h>
#include <isc/file.h>
#include <isc/mem.h>
#include <isc/result.h>
#include <isc/string.h>
#include <isc/util.h>
#include <dns/message.h>
#include "fuzz.h"
bool debug = false;
static isc_mem_t *mctx = NULL;
static uint8_t *output = NULL;
static size_t output_len = 1024;
static uint8_t render_buf[64 * 1024 - 1];
int
LLVMFuzzerInitialize(int *argc ISC_ATTR_UNUSED, char ***argv ISC_ATTR_UNUSED) {
isc_mem_create(&mctx);
output = isc_mem_get(mctx, output_len);
return 0;
}
static isc_result_t
parse_message(isc_buffer_t *input, dns_message_t **messagep) {
isc_result_t result;
dns_message_t *message = NULL;
dns_message_create(mctx, NULL, NULL, DNS_MESSAGE_INTENTPARSE, &message);
result = dns_message_parse(message, input, DNS_MESSAGEPARSE_BESTEFFORT);
if (result == DNS_R_RECOVERABLE) {
result = ISC_R_SUCCESS;
}
if (result == ISC_R_SUCCESS && messagep != NULL) {
*messagep = message;
} else {
dns_message_detach(&message);
}
return result;
}
static isc_result_t
print_message(dns_message_t *message) {
isc_result_t result;
isc_buffer_t buffer;
do {
isc_buffer_init(&buffer, output, output_len);
result = dns_message_totext(message, &dns_master_style_debug, 0,
&buffer);
if (result == ISC_R_NOSPACE) {
isc_mem_put(mctx, output, output_len);
output_len *= 2;
output = isc_mem_get(mctx, output_len);
continue;
}
} while (result == ISC_R_NOSPACE);
if (debug) {
fprintf(stderr, "%.*s\n", (int)isc_buffer_usedlength(&buffer),
output);
}
return result;
}
#define CHECKRESULT(r, f) \
{ \
r = (f); \
if (r != ISC_R_SUCCESS) { \
goto cleanup; \
} \
}
static isc_result_t
render_message(dns_message_t **messagep) {
isc_result_t result;
dns_message_t *message = *messagep;
isc_buffer_t buffer;
dns_compress_t cctx;
isc_buffer_init(&buffer, render_buf, sizeof(render_buf));
message->from_to_wire = DNS_MESSAGE_INTENTRENDER;
for (size_t i = 0; i < DNS_SECTION_MAX; i++) {
message->counts[i] = 0;
}
dns_compress_init(&cctx, mctx, 0);
CHECKRESULT(result, dns_message_renderbegin(message, &cctx, &buffer));
CHECKRESULT(result, dns_message_rendersection(message,
DNS_SECTION_QUESTION, 0));
CHECKRESULT(result,
dns_message_rendersection(message, DNS_SECTION_ANSWER, 0));
CHECKRESULT(result, dns_message_rendersection(
message, DNS_SECTION_AUTHORITY, 0));
CHECKRESULT(result, dns_message_rendersection(
message, DNS_SECTION_ADDITIONAL, 0));
dns_message_renderend(message);
dns_compress_invalidate(&cctx);
message->from_to_wire = DNS_MESSAGE_INTENTPARSE;
dns_message_detach(messagep);
result = parse_message(&buffer, messagep);
return result;
cleanup:
dns_compress_invalidate(&cctx);
return result;
}
int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
isc_buffer_t buffer;
isc_result_t result;
dns_message_t *message = NULL;
if (size > 65535) {
return 0;
}
isc_buffer_constinit(&buffer, data, size);
isc_buffer_add(&buffer, size);
isc_buffer_setactive(&buffer, size);
result = parse_message(&buffer, &message);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
result = print_message(message);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
result = render_message(&message);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
result = print_message(message);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
cleanup:
if (message != NULL) {
dns_message_detach(&message);
}
return 0;
}
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