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1 : : // Copyright (c) 2021-2022 The Bitcoin Core developers
2 : : // Distributed under the MIT software license, see the accompanying
3 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 : :
5 : : #include <netaddress.h>
6 : : #include <netbase.h>
7 : : #include <test/fuzz/FuzzedDataProvider.h>
8 : : #include <test/fuzz/fuzz.h>
9 : : #include <test/fuzz/util/net.h>
10 : :
11 : : #include <cstdint>
12 : : #include <string>
13 : : #include <vector>
14 : :
15 [ + - + - ]: 667 : FUZZ_TARGET(netbase_dns_lookup)
16 : : {
17 : 664 : FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
18 : 664 : const std::string name = fuzzed_data_provider.ConsumeRandomLengthString(512);
19 [ + - ]: 664 : const unsigned int max_results = fuzzed_data_provider.ConsumeIntegral<unsigned int>();
20 [ + - ]: 664 : const bool allow_lookup = fuzzed_data_provider.ConsumeBool();
21 [ + - ]: 664 : const uint16_t default_port = fuzzed_data_provider.ConsumeIntegral<uint16_t>();
22 : :
23 : 3870 : auto fuzzed_dns_lookup_function = [&](const std::string&, bool) {
24 : 3206 : std::vector<CNetAddr> resolved_addresses;
25 [ + - + + : 539893 : LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
+ + ]
26 [ + - ]: 536687 : resolved_addresses.push_back(ConsumeNetAddr(fuzzed_data_provider));
27 : 536687 : }
28 : 3206 : return resolved_addresses;
29 [ + - ]: 3206 : };
30 : :
31 : : {
32 [ + - ]: 664 : const std::vector<CNetAddr> resolved_addresses{LookupHost(name, max_results, allow_lookup, fuzzed_dns_lookup_function)};
33 [ + + ]: 175349 : for (const CNetAddr& resolved_address : resolved_addresses) {
34 [ + - + - ]: 174685 : assert(!resolved_address.IsInternal());
35 : 174685 : }
36 [ + + + - ]: 664 : assert(resolved_addresses.size() <= max_results || max_results == 0);
37 : 664 : }
38 : : {
39 [ + - ]: 664 : const std::optional<CNetAddr> resolved_address{LookupHost(name, allow_lookup, fuzzed_dns_lookup_function)};
40 [ + + ]: 664 : if (resolved_address.has_value()) {
41 [ + - + - : 214 : assert(!resolved_address.value().IsInternal());
+ - ]
42 : 214 : }
43 : 664 : }
44 : : {
45 [ + - ]: 664 : const std::vector<CService> resolved_services{Lookup(name, default_port, allow_lookup, max_results, fuzzed_dns_lookup_function)};
46 [ + + ]: 137673 : for (const CNetAddr& resolved_service : resolved_services) {
47 [ + - + - ]: 137009 : assert(!resolved_service.IsInternal());
48 : 137009 : }
49 [ + + + - ]: 664 : assert(resolved_services.size() <= max_results || max_results == 0);
50 : 664 : }
51 : : {
52 [ + - ]: 664 : const std::optional<CService> resolved_service{Lookup(name, default_port, allow_lookup, fuzzed_dns_lookup_function)};
53 [ + + ]: 664 : if (resolved_service.has_value()) {
54 [ + - + - : 154 : assert(!resolved_service.value().IsInternal());
+ - ]
55 : 154 : }
56 : 664 : }
57 : : {
58 [ + - ]: 664 : CService resolved_service = LookupNumeric(name, default_port, fuzzed_dns_lookup_function);
59 [ + - + - ]: 664 : assert(!resolved_service.IsInternal());
60 : 664 : }
61 : : {
62 [ + - ]: 664 : (void)LookupSubNet(name);
63 : : }
64 : 664 : }
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