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// Copyright (c) 2021-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <netaddress.h>
#include <netbase.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util/net.h>
#include <cstdint>
#include <string>
#include <vector>
FUZZ_TARGET(netbase_dns_lookup)
{
FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
const std::string name = fuzzed_data_provider.ConsumeRandomLengthString(512);
const unsigned int max_results = fuzzed_data_provider.ConsumeIntegral<unsigned int>();
const bool allow_lookup = fuzzed_data_provider.ConsumeBool();
const uint16_t default_port = fuzzed_data_provider.ConsumeIntegral<uint16_t>();
auto fuzzed_dns_lookup_function = [&](const std::string&, bool) {
std::vector<CNetAddr> resolved_addresses;
LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
resolved_addresses.push_back(ConsumeNetAddr(fuzzed_data_provider));
}
return resolved_addresses;
};
{
std::vector<CNetAddr> resolved_addresses;
if (LookupHost(name, resolved_addresses, max_results, allow_lookup, fuzzed_dns_lookup_function)) {
for (const CNetAddr& resolved_address : resolved_addresses) {
assert(!resolved_address.IsInternal());
}
}
assert(resolved_addresses.size() <= max_results || max_results == 0);
}
{
CNetAddr resolved_address;
if (LookupHost(name, resolved_address, allow_lookup, fuzzed_dns_lookup_function)) {
assert(!resolved_address.IsInternal());
}
}
{
std::vector<CService> resolved_services;
if (Lookup(name, resolved_services, default_port, allow_lookup, max_results, fuzzed_dns_lookup_function)) {
for (const CNetAddr& resolved_service : resolved_services) {
assert(!resolved_service.IsInternal());
}
}
assert(resolved_services.size() <= max_results || max_results == 0);
}
{
CService resolved_service;
if (Lookup(name, resolved_service, default_port, allow_lookup, fuzzed_dns_lookup_function)) {
assert(!resolved_service.IsInternal());
}
}
{
CService resolved_service = LookupNumeric(name, default_port, fuzzed_dns_lookup_function);
assert(!resolved_service.IsInternal());
}
{
CSubNet resolved_subnet;
if (LookupSubNet(name, resolved_subnet)) {
assert(resolved_subnet.IsValid());
}
}
}
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