Bitcoin Core  27.99.0
P2P Digital Currency
netbase_dns_lookup.cpp
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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>
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 FUZZ_TARGET(netbase_dns_lookup)
16 {
17  FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
18  const std::string name = fuzzed_data_provider.ConsumeRandomLengthString(512);
19  const unsigned int max_results = fuzzed_data_provider.ConsumeIntegral<unsigned int>();
20  const bool allow_lookup = fuzzed_data_provider.ConsumeBool();
21  const uint16_t default_port = fuzzed_data_provider.ConsumeIntegral<uint16_t>();
22 
23  auto fuzzed_dns_lookup_function = [&](const std::string&, bool) {
24  std::vector<CNetAddr> resolved_addresses;
25  LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
26  resolved_addresses.push_back(ConsumeNetAddr(fuzzed_data_provider));
27  }
28  return resolved_addresses;
29  };
30 
31  {
32  const std::vector<CNetAddr> resolved_addresses{LookupHost(name, max_results, allow_lookup, fuzzed_dns_lookup_function)};
33  for (const CNetAddr& resolved_address : resolved_addresses) {
34  assert(!resolved_address.IsInternal());
35  }
36  assert(resolved_addresses.size() <= max_results || max_results == 0);
37  }
38  {
39  const std::optional<CNetAddr> resolved_address{LookupHost(name, allow_lookup, fuzzed_dns_lookup_function)};
40  if (resolved_address.has_value()) {
41  assert(!resolved_address.value().IsInternal());
42  }
43  }
44  {
45  const std::vector<CService> resolved_services{Lookup(name, default_port, allow_lookup, max_results, fuzzed_dns_lookup_function)};
46  for (const CNetAddr& resolved_service : resolved_services) {
47  assert(!resolved_service.IsInternal());
48  }
49  assert(resolved_services.size() <= max_results || max_results == 0);
50  }
51  {
52  const std::optional<CService> resolved_service{Lookup(name, default_port, allow_lookup, fuzzed_dns_lookup_function)};
53  if (resolved_service.has_value()) {
54  assert(!resolved_service.value().IsInternal());
55  }
56  }
57  {
58  CService resolved_service = LookupNumeric(name, default_port, fuzzed_dns_lookup_function);
59  assert(!resolved_service.IsInternal());
60  }
61  {
62  (void)LookupSubNet(name);
63  }
64 }
Network address.
Definition: netaddress.h:112
bool IsInternal() const
Definition: netaddress.cpp:476
A combination of a network address (CNetAddr) and a (TCP) port.
Definition: netaddress.h:531
#define LIMITED_WHILE(condition, limit)
Can be used to limit a theoretically unbounded loop.
Definition: fuzz.h:22
CSubNet LookupSubNet(const std::string &subnet_str)
Parse and resolve a specified subnet string into the appropriate internal representation.
Definition: netbase.cpp:743
std::vector< CService > Lookup(const std::string &name, uint16_t portDefault, bool fAllowLookup, unsigned int nMaxSolutions, DNSLookupFn dns_lookup_function)
Resolve a service string to its corresponding service.
Definition: netbase.cpp:184
std::vector< CNetAddr > LookupHost(const std::string &name, unsigned int nMaxSolutions, bool fAllowLookup, DNSLookupFn dns_lookup_function)
Resolve a host string to its corresponding network addresses.
Definition: netbase.cpp:166
CService LookupNumeric(const std::string &name, uint16_t portDefault, DNSLookupFn dns_lookup_function)
Resolve a service string with a numeric IP to its first corresponding service.
Definition: netbase.cpp:209
FUZZ_TARGET(netbase_dns_lookup)
const char * name
Definition: rest.cpp:49
CNetAddr ConsumeNetAddr(FuzzedDataProvider &fuzzed_data_provider, FastRandomContext *rand) noexcept
Create a CNetAddr.
Definition: net.cpp:28
assert(!tx.IsCoinBase())