// Copyright (c) 2012-2021 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 <chainparams.h>
#include <clientversion.h>
#include <cstdint>
#include <net.h>
#include <netaddress.h>
#include <netbase.h>
#include <serialize.h>
#include <span.h>
#include <streams.h>
#include <test/util/setup_common.h>
#include <util/strencodings.h>
#include <util/string.h>
#include <util/system.h>
#include <version.h>

#include <boost/test/unit_test.hpp>

#include <algorithm>
#include <ios>
#include <memory>
#include <optional>
#include <string>

using namespace std::literals;

BOOST_FIXTURE_TEST_SUITE(net_tests, BasicTestingSetup)

BOOST_AUTO_TEST_CASE(cnode_listen_port)
{
    // test default
    uint16_t port{GetListenPort()};
    BOOST_CHECK(port == Params().GetDefaultPort());
    // test set port
    uint16_t altPort = 12345;
    BOOST_CHECK(gArgs.SoftSetArg("-port", ToString(altPort)));
    port = GetListenPort();
    BOOST_CHECK(port == altPort);
}

BOOST_AUTO_TEST_CASE(cnode_simple_test)
{
    NodeId id = 0;

    in_addr ipv4Addr;
    ipv4Addr.s_addr = 0xa0b0c001;

    CAddress addr = CAddress(CService(ipv4Addr, 7777), NODE_NETWORK);
    std::string pszDest;

    std::unique_ptr<CNode> pnode1 = std::make_unique<CNode>(id++,
                                                            NODE_NETWORK,
                                                            /*sock=*/nullptr,
                                                            addr,
                                                            /*nKeyedNetGroupIn=*/0,
                                                            /*nLocalHostNonceIn=*/0,
                                                            CAddress(),
                                                            pszDest,
                                                            ConnectionType::OUTBOUND_FULL_RELAY,
                                                            /*inbound_onion=*/false);
    BOOST_CHECK(pnode1->IsFullOutboundConn() == true);
    BOOST_CHECK(pnode1->IsManualConn() == false);
    BOOST_CHECK(pnode1->IsBlockOnlyConn() == false);
    BOOST_CHECK(pnode1->IsFeelerConn() == false);
    BOOST_CHECK(pnode1->IsAddrFetchConn() == false);
    BOOST_CHECK(pnode1->IsInboundConn() == false);
    BOOST_CHECK(pnode1->m_inbound_onion == false);
    BOOST_CHECK_EQUAL(pnode1->ConnectedThroughNetwork(), Network::NET_IPV4);

    std::unique_ptr<CNode> pnode2 = std::make_unique<CNode>(id++,
                                                            NODE_NETWORK,
                                                            /*sock=*/nullptr,
                                                            addr,
                                                            /*nKeyedNetGroupIn=*/1,
                                                            /*nLocalHostNonceIn=*/1,
                                                            CAddress(),
                                                            pszDest,
                                                            ConnectionType::INBOUND,
                                                            /*inbound_onion=*/false);
    BOOST_CHECK(pnode2->IsFullOutboundConn() == false);
    BOOST_CHECK(pnode2->IsManualConn() == false);
    BOOST_CHECK(pnode2->IsBlockOnlyConn() == false);
    BOOST_CHECK(pnode2->IsFeelerConn() == false);
    BOOST_CHECK(pnode2->IsAddrFetchConn() == false);
    BOOST_CHECK(pnode2->IsInboundConn() == true);
    BOOST_CHECK(pnode2->m_inbound_onion == false);
    BOOST_CHECK_EQUAL(pnode2->ConnectedThroughNetwork(), Network::NET_IPV4);

    std::unique_ptr<CNode> pnode3 = std::make_unique<CNode>(id++,
                                                            NODE_NETWORK,
                                                            /*sock=*/nullptr,
                                                            addr,
                                                            /*nKeyedNetGroupIn=*/0,
                                                            /*nLocalHostNonceIn=*/0,
                                                            CAddress(),
                                                            pszDest,
                                                            ConnectionType::OUTBOUND_FULL_RELAY,
                                                            /*inbound_onion=*/false);
    BOOST_CHECK(pnode3->IsFullOutboundConn() == true);
    BOOST_CHECK(pnode3->IsManualConn() == false);
    BOOST_CHECK(pnode3->IsBlockOnlyConn() == false);
    BOOST_CHECK(pnode3->IsFeelerConn() == false);
    BOOST_CHECK(pnode3->IsAddrFetchConn() == false);
    BOOST_CHECK(pnode3->IsInboundConn() == false);
    BOOST_CHECK(pnode3->m_inbound_onion == false);
    BOOST_CHECK_EQUAL(pnode3->ConnectedThroughNetwork(), Network::NET_IPV4);

    std::unique_ptr<CNode> pnode4 = std::make_unique<CNode>(id++,
                                                            NODE_NETWORK,
                                                            /*sock=*/nullptr,
                                                            addr,
                                                            /*nKeyedNetGroupIn=*/1,
                                                            /*nLocalHostNonceIn=*/1,
                                                            CAddress(),
                                                            pszDest,
                                                            ConnectionType::INBOUND,
                                                            /*inbound_onion=*/true);
    BOOST_CHECK(pnode4->IsFullOutboundConn() == false);
    BOOST_CHECK(pnode4->IsManualConn() == false);
    BOOST_CHECK(pnode4->IsBlockOnlyConn() == false);
    BOOST_CHECK(pnode4->IsFeelerConn() == false);
    BOOST_CHECK(pnode4->IsAddrFetchConn() == false);
    BOOST_CHECK(pnode4->IsInboundConn() == true);
    BOOST_CHECK(pnode4->m_inbound_onion == true);
    BOOST_CHECK_EQUAL(pnode4->ConnectedThroughNetwork(), Network::NET_ONION);
}

BOOST_AUTO_TEST_CASE(cnetaddr_basic)
{
    CNetAddr addr;

    // IPv4, INADDR_ANY
    BOOST_REQUIRE(LookupHost("0.0.0.0", addr, false));
    BOOST_REQUIRE(!addr.IsValid());
    BOOST_REQUIRE(addr.IsIPv4());

    BOOST_CHECK(addr.IsBindAny());
    BOOST_CHECK(addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(), "0.0.0.0");

    // IPv4, INADDR_NONE
    BOOST_REQUIRE(LookupHost("255.255.255.255", addr, false));
    BOOST_REQUIRE(!addr.IsValid());
    BOOST_REQUIRE(addr.IsIPv4());

    BOOST_CHECK(!addr.IsBindAny());
    BOOST_CHECK(addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(), "255.255.255.255");

    // IPv4, casual
    BOOST_REQUIRE(LookupHost("12.34.56.78", addr, false));
    BOOST_REQUIRE(addr.IsValid());
    BOOST_REQUIRE(addr.IsIPv4());

    BOOST_CHECK(!addr.IsBindAny());
    BOOST_CHECK(addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(), "12.34.56.78");

    // IPv6, in6addr_any
    BOOST_REQUIRE(LookupHost("::", addr, false));
    BOOST_REQUIRE(!addr.IsValid());
    BOOST_REQUIRE(addr.IsIPv6());

    BOOST_CHECK(addr.IsBindAny());
    BOOST_CHECK(addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(), "::");

    // IPv6, casual
    BOOST_REQUIRE(LookupHost("1122:3344:5566:7788:9900:aabb:ccdd:eeff", addr, false));
    BOOST_REQUIRE(addr.IsValid());
    BOOST_REQUIRE(addr.IsIPv6());

    BOOST_CHECK(!addr.IsBindAny());
    BOOST_CHECK(addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(), "1122:3344:5566:7788:9900:aabb:ccdd:eeff");

    // IPv6, scoped/link-local. See https://tools.ietf.org/html/rfc4007
    // We support non-negative decimal integers (uint32_t) as zone id indices.
    // Normal link-local scoped address functionality is to append "%" plus the
    // zone id, for example, given a link-local address of "fe80::1" and a zone
    // id of "32", return the address as "fe80::1%32".
    const std::string link_local{"fe80::1"};
    const std::string scoped_addr{link_local + "%32"};
    BOOST_REQUIRE(LookupHost(scoped_addr, addr, false));
    BOOST_REQUIRE(addr.IsValid());
    BOOST_REQUIRE(addr.IsIPv6());
    BOOST_CHECK(!addr.IsBindAny());
    BOOST_CHECK_EQUAL(addr.ToString(), scoped_addr);

    // Test that the delimiter "%" and default zone id of 0 can be omitted for the default scope.
    BOOST_REQUIRE(LookupHost(link_local + "%0", addr, false));
    BOOST_REQUIRE(addr.IsValid());
    BOOST_REQUIRE(addr.IsIPv6());
    BOOST_CHECK(!addr.IsBindAny());
    BOOST_CHECK_EQUAL(addr.ToString(), link_local);

    // TORv2, no longer supported
    BOOST_CHECK(!addr.SetSpecial("6hzph5hv6337r6p2.onion"));

    // TORv3
    const char* torv3_addr = "pg6mmjiyjmcrsslvykfwnntlaru7p5svn6y2ymmju6nubxndf4pscryd.onion";
    BOOST_REQUIRE(addr.SetSpecial(torv3_addr));
    BOOST_REQUIRE(addr.IsValid());
    BOOST_REQUIRE(addr.IsTor());

    BOOST_CHECK(!addr.IsI2P());
    BOOST_CHECK(!addr.IsBindAny());
    BOOST_CHECK(!addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(), torv3_addr);

    // TORv3, broken, with wrong checksum
    BOOST_CHECK(!addr.SetSpecial("pg6mmjiyjmcrsslvykfwnntlaru7p5svn6y2ymmju6nubxndf4pscsad.onion"));

    // TORv3, broken, with wrong version
    BOOST_CHECK(!addr.SetSpecial("pg6mmjiyjmcrsslvykfwnntlaru7p5svn6y2ymmju6nubxndf4pscrye.onion"));

    // TORv3, malicious
    BOOST_CHECK(!addr.SetSpecial(std::string{
        "pg6mmjiyjmcrsslvykfwnntlaru7p5svn6y2ymmju6nubxndf4pscryd\0wtf.onion", 66}));

    // TOR, bogus length
    BOOST_CHECK(!addr.SetSpecial(std::string{"mfrggzak.onion"}));

    // TOR, invalid base32
    BOOST_CHECK(!addr.SetSpecial(std::string{"mf*g zak.onion"}));

    // I2P
    const char* i2p_addr = "UDHDrtrcetjm5sxzskjyr5ztpeszydbh4dpl3pl4utgqqw2v4jna.b32.I2P";
    BOOST_REQUIRE(addr.SetSpecial(i2p_addr));
    BOOST_REQUIRE(addr.IsValid());
    BOOST_REQUIRE(addr.IsI2P());

    BOOST_CHECK(!addr.IsTor());
    BOOST_CHECK(!addr.IsBindAny());
    BOOST_CHECK(!addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(), ToLower(i2p_addr));

    // I2P, correct length, but decodes to less than the expected number of bytes.
    BOOST_CHECK(!addr.SetSpecial("udhdrtrcetjm5sxzskjyr5ztpeszydbh4dpl3pl4utgqqw2v4jn=.b32.i2p"));

    // I2P, extra unnecessary padding
    BOOST_CHECK(!addr.SetSpecial("udhdrtrcetjm5sxzskjyr5ztpeszydbh4dpl3pl4utgqqw2v4jna=.b32.i2p"));

    // I2P, malicious
    BOOST_CHECK(!addr.SetSpecial("udhdrtrcetjm5sxzskjyr5ztpeszydbh4dpl3pl4utgqqw2v\0wtf.b32.i2p"s));

    // I2P, valid but unsupported (56 Base32 characters)
    // See "Encrypted LS with Base 32 Addresses" in
    // https://geti2p.net/spec/encryptedleaseset.txt
    BOOST_CHECK(
        !addr.SetSpecial("pg6mmjiyjmcrsslvykfwnntlaru7p5svn6y2ymmju6nubxndf4pscsad.b32.i2p"));

    // I2P, invalid base32
    BOOST_CHECK(!addr.SetSpecial(std::string{"tp*szydbh4dp.b32.i2p"}));

    // Internal
    addr.SetInternal("esffpp");
    BOOST_REQUIRE(!addr.IsValid()); // "internal" is considered invalid
    BOOST_REQUIRE(addr.IsInternal());

    BOOST_CHECK(!addr.IsBindAny());
    BOOST_CHECK(addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(), "esffpvrt3wpeaygy.internal");

    // Totally bogus
    BOOST_CHECK(!addr.SetSpecial("totally bogus"));
}

BOOST_AUTO_TEST_CASE(cnetaddr_tostring_canonical_ipv6)
{
    // Test that CNetAddr::ToString formats IPv6 addresses with zero compression as described in
    // RFC 5952 ("A Recommendation for IPv6 Address Text Representation").
    const std::map<std::string, std::string> canonical_representations_ipv6{
        {"0000:0000:0000:0000:0000:0000:0000:0000", "::"},
        {"000:0000:000:00:0:00:000:0000", "::"},
        {"000:000:000:000:000:000:000:000", "::"},
        {"00:00:00:00:00:00:00:00", "::"},
        {"0:0:0:0:0:0:0:0", "::"},
        {"0:0:0:0:0:0:0:1", "::1"},
        {"2001:0:0:1:0:0:0:1", "2001:0:0:1::1"},
        {"2001:0db8:0:0:1:0:0:1", "2001:db8::1:0:0:1"},
        {"2001:0db8:85a3:0000:0000:8a2e:0370:7334", "2001:db8:85a3::8a2e:370:7334"},
        {"2001:0db8::0001", "2001:db8::1"},
        {"2001:0db8::0001:0000", "2001:db8::1:0"},
        {"2001:0db8::1:0:0:1", "2001:db8::1:0:0:1"},
        {"2001:db8:0000:0:1::1", "2001:db8::1:0:0:1"},
        {"2001:db8:0000:1:1:1:1:1", "2001:db8:0:1:1:1:1:1"},
        {"2001:db8:0:0:0:0:2:1", "2001:db8::2:1"},
        {"2001:db8:0:0:0::1", "2001:db8::1"},
        {"2001:db8:0:0:1:0:0:1", "2001:db8::1:0:0:1"},
        {"2001:db8:0:0:1::1", "2001:db8::1:0:0:1"},
        {"2001:DB8:0:0:1::1", "2001:db8::1:0:0:1"},
        {"2001:db8:0:0::1", "2001:db8::1"},
        {"2001:db8:0:0:aaaa::1", "2001:db8::aaaa:0:0:1"},
        {"2001:db8:0:1:1:1:1:1", "2001:db8:0:1:1:1:1:1"},
        {"2001:db8:0::1", "2001:db8::1"},
        {"2001:db8:85a3:0:0:8a2e:370:7334", "2001:db8:85a3::8a2e:370:7334"},
        {"2001:db8::0:1", "2001:db8::1"},
        {"2001:db8::0:1:0:0:1", "2001:db8::1:0:0:1"},
        {"2001:DB8::1", "2001:db8::1"},
        {"2001:db8::1", "2001:db8::1"},
        {"2001:db8::1:0:0:1", "2001:db8::1:0:0:1"},
        {"2001:db8::1:1:1:1:1", "2001:db8:0:1:1:1:1:1"},
        {"2001:db8::aaaa:0:0:1", "2001:db8::aaaa:0:0:1"},
        {"2001:db8:aaaa:bbbb:cccc:dddd:0:1", "2001:db8:aaaa:bbbb:cccc:dddd:0:1"},
        {"2001:db8:aaaa:bbbb:cccc:dddd::1", "2001:db8:aaaa:bbbb:cccc:dddd:0:1"},
        {"2001:db8:aaaa:bbbb:cccc:dddd:eeee:0001", "2001:db8:aaaa:bbbb:cccc:dddd:eeee:1"},
        {"2001:db8:aaaa:bbbb:cccc:dddd:eeee:001", "2001:db8:aaaa:bbbb:cccc:dddd:eeee:1"},
        {"2001:db8:aaaa:bbbb:cccc:dddd:eeee:01", "2001:db8:aaaa:bbbb:cccc:dddd:eeee:1"},
        {"2001:db8:aaaa:bbbb:cccc:dddd:eeee:1", "2001:db8:aaaa:bbbb:cccc:dddd:eeee:1"},
        {"2001:db8:aaaa:bbbb:cccc:dddd:eeee:aaaa", "2001:db8:aaaa:bbbb:cccc:dddd:eeee:aaaa"},
        {"2001:db8:aaaa:bbbb:cccc:dddd:eeee:AAAA", "2001:db8:aaaa:bbbb:cccc:dddd:eeee:aaaa"},
        {"2001:db8:aaaa:bbbb:cccc:dddd:eeee:AaAa", "2001:db8:aaaa:bbbb:cccc:dddd:eeee:aaaa"},
    };
    for (const auto& [input_address, expected_canonical_representation_output] : canonical_representations_ipv6) {
        CNetAddr net_addr;
        BOOST_REQUIRE(LookupHost(input_address, net_addr, false));
        BOOST_REQUIRE(net_addr.IsIPv6());
        BOOST_CHECK_EQUAL(net_addr.ToString(), expected_canonical_representation_output);
    }
}

BOOST_AUTO_TEST_CASE(cnetaddr_serialize_v1)
{
    CNetAddr addr;
    CDataStream s(SER_NETWORK, PROTOCOL_VERSION);

    s << addr;
    BOOST_CHECK_EQUAL(HexStr(s), "00000000000000000000000000000000");
    s.clear();

    BOOST_REQUIRE(LookupHost("1.2.3.4", addr, false));
    s << addr;
    BOOST_CHECK_EQUAL(HexStr(s), "00000000000000000000ffff01020304");
    s.clear();

    BOOST_REQUIRE(LookupHost("1a1b:2a2b:3a3b:4a4b:5a5b:6a6b:7a7b:8a8b", addr, false));
    s << addr;
    BOOST_CHECK_EQUAL(HexStr(s), "1a1b2a2b3a3b4a4b5a5b6a6b7a7b8a8b");
    s.clear();

    // TORv2, no longer supported
    BOOST_CHECK(!addr.SetSpecial("6hzph5hv6337r6p2.onion"));

    BOOST_REQUIRE(addr.SetSpecial("pg6mmjiyjmcrsslvykfwnntlaru7p5svn6y2ymmju6nubxndf4pscryd.onion"));
    s << addr;
    BOOST_CHECK_EQUAL(HexStr(s), "00000000000000000000000000000000");
    s.clear();

    addr.SetInternal("a");
    s << addr;
    BOOST_CHECK_EQUAL(HexStr(s), "fd6b88c08724ca978112ca1bbdcafac2");
    s.clear();
}

BOOST_AUTO_TEST_CASE(cnetaddr_serialize_v2)
{
    CNetAddr addr;
    CDataStream s(SER_NETWORK, PROTOCOL_VERSION);
    // Add ADDRV2_FORMAT to the version so that the CNetAddr
    // serialize method produces an address in v2 format.
    s.SetVersion(s.GetVersion() | ADDRV2_FORMAT);

    s << addr;
    BOOST_CHECK_EQUAL(HexStr(s), "021000000000000000000000000000000000");
    s.clear();

    BOOST_REQUIRE(LookupHost("1.2.3.4", addr, false));
    s << addr;
    BOOST_CHECK_EQUAL(HexStr(s), "010401020304");
    s.clear();

    BOOST_REQUIRE(LookupHost("1a1b:2a2b:3a3b:4a4b:5a5b:6a6b:7a7b:8a8b", addr, false));
    s << addr;
    BOOST_CHECK_EQUAL(HexStr(s), "02101a1b2a2b3a3b4a4b5a5b6a6b7a7b8a8b");
    s.clear();

    // TORv2, no longer supported
    BOOST_CHECK(!addr.SetSpecial("6hzph5hv6337r6p2.onion"));

    BOOST_REQUIRE(addr.SetSpecial("kpgvmscirrdqpekbqjsvw5teanhatztpp2gl6eee4zkowvwfxwenqaid.onion"));
    s << addr;
    BOOST_CHECK_EQUAL(HexStr(s), "042053cd5648488c4707914182655b7664034e09e66f7e8cbf1084e654eb56c5bd88");
    s.clear();

    BOOST_REQUIRE(addr.SetInternal("a"));
    s << addr;
    BOOST_CHECK_EQUAL(HexStr(s), "0210fd6b88c08724ca978112ca1bbdcafac2");
    s.clear();
}

BOOST_AUTO_TEST_CASE(cnetaddr_unserialize_v2)
{
    CNetAddr addr;
    CDataStream s(SER_NETWORK, PROTOCOL_VERSION);
    // Add ADDRV2_FORMAT to the version so that the CNetAddr
    // unserialize method expects an address in v2 format.
    s.SetVersion(s.GetVersion() | ADDRV2_FORMAT);

    // Valid IPv4.
    s << Span{ParseHex("01"          // network type (IPv4)
                       "04"          // address length
                       "01020304")}; // address
    s >> addr;
    BOOST_CHECK(addr.IsValid());
    BOOST_CHECK(addr.IsIPv4());
    BOOST_CHECK(addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(), "1.2.3.4");
    BOOST_REQUIRE(s.empty());

    // Invalid IPv4, valid length but address itself is shorter.
    s << Span{ParseHex("01"      // network type (IPv4)
                       "04"      // address length
                       "0102")}; // address
    BOOST_CHECK_EXCEPTION(s >> addr, std::ios_base::failure, HasReason("end of data"));
    BOOST_REQUIRE(!s.empty()); // The stream is not consumed on invalid input.
    s.clear();

    // Invalid IPv4, with bogus length.
    s << Span{ParseHex("01"          // network type (IPv4)
                       "05"          // address length
                       "01020304")}; // address
    BOOST_CHECK_EXCEPTION(s >> addr, std::ios_base::failure,
                          HasReason("BIP155 IPv4 address with length 5 (should be 4)"));
    BOOST_REQUIRE(!s.empty()); // The stream is not consumed on invalid input.
    s.clear();

    // Invalid IPv4, with extreme length.
    s << Span{ParseHex("01"          // network type (IPv4)
                       "fd0102"      // address length (513 as CompactSize)
                       "01020304")}; // address
    BOOST_CHECK_EXCEPTION(s >> addr, std::ios_base::failure,
                          HasReason("Address too long: 513 > 512"));
    BOOST_REQUIRE(!s.empty()); // The stream is not consumed on invalid input.
    s.clear();

    // Valid IPv6.
    s << Span{ParseHex("02"                                  // network type (IPv6)
                       "10"                                  // address length
                       "0102030405060708090a0b0c0d0e0f10")}; // address
    s >> addr;
    BOOST_CHECK(addr.IsValid());
    BOOST_CHECK(addr.IsIPv6());
    BOOST_CHECK(addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(), "102:304:506:708:90a:b0c:d0e:f10");
    BOOST_REQUIRE(s.empty());

    // Valid IPv6, contains embedded "internal".
    s << Span{ParseHex(
        "02"                                  // network type (IPv6)
        "10"                                  // address length
        "fd6b88c08724ca978112ca1bbdcafac2")}; // address: 0xfd + sha256("bitcoin")[0:5] +
                                              // sha256(name)[0:10]
    s >> addr;
    BOOST_CHECK(addr.IsInternal());
    BOOST_CHECK(addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(), "zklycewkdo64v6wc.internal");
    BOOST_REQUIRE(s.empty());

    // Invalid IPv6, with bogus length.
    s << Span{ParseHex("02"    // network type (IPv6)
                       "04"    // address length
                       "00")}; // address
    BOOST_CHECK_EXCEPTION(s >> addr, std::ios_base::failure,
                          HasReason("BIP155 IPv6 address with length 4 (should be 16)"));
    BOOST_REQUIRE(!s.empty()); // The stream is not consumed on invalid input.
    s.clear();

    // Invalid IPv6, contains embedded IPv4.
    s << Span{ParseHex("02"                                  // network type (IPv6)
                       "10"                                  // address length
                       "00000000000000000000ffff01020304")}; // address
    s >> addr;
    BOOST_CHECK(!addr.IsValid());
    BOOST_REQUIRE(s.empty());

    // Invalid IPv6, contains embedded TORv2.
    s << Span{ParseHex("02"                                  // network type (IPv6)
                       "10"                                  // address length
                       "fd87d87eeb430102030405060708090a")}; // address
    s >> addr;
    BOOST_CHECK(!addr.IsValid());
    BOOST_REQUIRE(s.empty());

    // TORv2, no longer supported.
    s << Span{ParseHex("03"                      // network type (TORv2)
                       "0a"                      // address length
                       "f1f2f3f4f5f6f7f8f9fa")}; // address
    s >> addr;
    BOOST_CHECK(!addr.IsValid());
    BOOST_REQUIRE(s.empty());

    // Valid TORv3.
    s << Span{ParseHex("04"                               // network type (TORv3)
                       "20"                               // address length
                       "79bcc625184b05194975c28b66b66b04" // address
                       "69f7f6556fb1ac3189a79b40dda32f1f"
                       )};
    s >> addr;
    BOOST_CHECK(addr.IsValid());
    BOOST_CHECK(addr.IsTor());
    BOOST_CHECK(!addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(),
                      "pg6mmjiyjmcrsslvykfwnntlaru7p5svn6y2ymmju6nubxndf4pscryd.onion");
    BOOST_REQUIRE(s.empty());

    // Invalid TORv3, with bogus length.
    s << Span{ParseHex("04" // network type (TORv3)
                       "00" // address length
                       "00" // address
                       )};
    BOOST_CHECK_EXCEPTION(s >> addr, std::ios_base::failure,
                          HasReason("BIP155 TORv3 address with length 0 (should be 32)"));
    BOOST_REQUIRE(!s.empty()); // The stream is not consumed on invalid input.
    s.clear();

    // Valid I2P.
    s << Span{ParseHex("05"                               // network type (I2P)
                       "20"                               // address length
                       "a2894dabaec08c0051a481a6dac88b64" // address
                       "f98232ae42d4b6fd2fa81952dfe36a87")};
    s >> addr;
    BOOST_CHECK(addr.IsValid());
    BOOST_CHECK(addr.IsI2P());
    BOOST_CHECK(!addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(),
                      "ukeu3k5oycgaauneqgtnvselmt4yemvoilkln7jpvamvfx7dnkdq.b32.i2p");
    BOOST_REQUIRE(s.empty());

    // Invalid I2P, with bogus length.
    s << Span{ParseHex("05" // network type (I2P)
                       "03" // address length
                       "00" // address
                       )};
    BOOST_CHECK_EXCEPTION(s >> addr, std::ios_base::failure,
                          HasReason("BIP155 I2P address with length 3 (should be 32)"));
    BOOST_REQUIRE(!s.empty()); // The stream is not consumed on invalid input.
    s.clear();

    // Valid CJDNS.
    s << Span{ParseHex("06"                               // network type (CJDNS)
                       "10"                               // address length
                       "fc000001000200030004000500060007" // address
                       )};
    s >> addr;
    BOOST_CHECK(addr.IsValid());
    BOOST_CHECK(addr.IsCJDNS());
    BOOST_CHECK(!addr.IsAddrV1Compatible());
    BOOST_CHECK_EQUAL(addr.ToString(), "fc00:1:2:3:4:5:6:7");
    BOOST_REQUIRE(s.empty());

    // Invalid CJDNS, wrong prefix.
    s << Span{ParseHex("06"                               // network type (CJDNS)
                       "10"                               // address length
                       "aa000001000200030004000500060007" // address
                       )};
    s >> addr;
    BOOST_CHECK(addr.IsCJDNS());
    BOOST_CHECK(!addr.IsValid());
    BOOST_REQUIRE(s.empty());

    // Invalid CJDNS, with bogus length.
    s << Span{ParseHex("06" // network type (CJDNS)
                       "01" // address length
                       "00" // address
                       )};
    BOOST_CHECK_EXCEPTION(s >> addr, std::ios_base::failure,
                          HasReason("BIP155 CJDNS address with length 1 (should be 16)"));
    BOOST_REQUIRE(!s.empty()); // The stream is not consumed on invalid input.
    s.clear();

    // Unknown, with extreme length.
    s << Span{ParseHex("aa"             // network type (unknown)
                       "fe00000002"     // address length (CompactSize's MAX_SIZE)
                       "01020304050607" // address
                       )};
    BOOST_CHECK_EXCEPTION(s >> addr, std::ios_base::failure,
                          HasReason("Address too long: 33554432 > 512"));
    BOOST_REQUIRE(!s.empty()); // The stream is not consumed on invalid input.
    s.clear();

    // Unknown, with reasonable length.
    s << Span{ParseHex("aa"       // network type (unknown)
                       "04"       // address length
                       "01020304" // address
                       )};
    s >> addr;
    BOOST_CHECK(!addr.IsValid());
    BOOST_REQUIRE(s.empty());

    // Unknown, with zero length.
    s << Span{ParseHex("aa" // network type (unknown)
                       "00" // address length
                       ""   // address
                       )};
    s >> addr;
    BOOST_CHECK(!addr.IsValid());
    BOOST_REQUIRE(s.empty());
}

// prior to PR #14728, this test triggers an undefined behavior
BOOST_AUTO_TEST_CASE(ipv4_peer_with_ipv6_addrMe_test)
{
    // set up local addresses; all that's necessary to reproduce the bug is
    // that a normal IPv4 address is among the entries, but if this address is
    // !IsRoutable the undefined behavior is easier to trigger deterministically
    {
        LOCK(g_maplocalhost_mutex);
        in_addr ipv4AddrLocal;
        ipv4AddrLocal.s_addr = 0x0100007f;
        CNetAddr addr = CNetAddr(ipv4AddrLocal);
        LocalServiceInfo lsi;
        lsi.nScore = 23;
        lsi.nPort = 42;
        mapLocalHost[addr] = lsi;
    }

    // create a peer with an IPv4 address
    in_addr ipv4AddrPeer;
    ipv4AddrPeer.s_addr = 0xa0b0c001;
    CAddress addr = CAddress(CService(ipv4AddrPeer, 7777), NODE_NETWORK);
    std::unique_ptr<CNode> pnode = std::make_unique<CNode>(/*id=*/0,
                                                           NODE_NETWORK,
                                                           /*sock=*/nullptr,
                                                           addr,
                                                           /*nKeyedNetGroupIn=*/0,
                                                           /*nLocalHostNonceIn=*/0,
                                                           CAddress{},
                                                           /*pszDest=*/std::string{},
                                                           ConnectionType::OUTBOUND_FULL_RELAY,
                                                           /*inbound_onion=*/false);
    pnode->fSuccessfullyConnected.store(true);

    // the peer claims to be reaching us via IPv6
    in6_addr ipv6AddrLocal;
    memset(ipv6AddrLocal.s6_addr, 0, 16);
    ipv6AddrLocal.s6_addr[0] = 0xcc;
    CAddress addrLocal = CAddress(CService(ipv6AddrLocal, 7777), NODE_NETWORK);
    pnode->SetAddrLocal(addrLocal);

    // before patch, this causes undefined behavior detectable with clang's -fsanitize=memory
    GetLocalAddrForPeer(&*pnode);

    // suppress no-checks-run warning; if this test fails, it's by triggering a sanitizer
    BOOST_CHECK(1);
}


BOOST_AUTO_TEST_CASE(LimitedAndReachable_Network)
{
    BOOST_CHECK(IsReachable(NET_IPV4));
    BOOST_CHECK(IsReachable(NET_IPV6));
    BOOST_CHECK(IsReachable(NET_ONION));
    BOOST_CHECK(IsReachable(NET_I2P));

    SetReachable(NET_IPV4, false);
    SetReachable(NET_IPV6, false);
    SetReachable(NET_ONION, false);
    SetReachable(NET_I2P, false);

    BOOST_CHECK(!IsReachable(NET_IPV4));
    BOOST_CHECK(!IsReachable(NET_IPV6));
    BOOST_CHECK(!IsReachable(NET_ONION));
    BOOST_CHECK(!IsReachable(NET_I2P));

    SetReachable(NET_IPV4, true);
    SetReachable(NET_IPV6, true);
    SetReachable(NET_ONION, true);
    SetReachable(NET_I2P, true);

    BOOST_CHECK(IsReachable(NET_IPV4));
    BOOST_CHECK(IsReachable(NET_IPV6));
    BOOST_CHECK(IsReachable(NET_ONION));
    BOOST_CHECK(IsReachable(NET_I2P));
}

BOOST_AUTO_TEST_CASE(LimitedAndReachable_NetworkCaseUnroutableAndInternal)
{
    BOOST_CHECK(IsReachable(NET_UNROUTABLE));
    BOOST_CHECK(IsReachable(NET_INTERNAL));

    SetReachable(NET_UNROUTABLE, false);
    SetReachable(NET_INTERNAL, false);

    BOOST_CHECK(IsReachable(NET_UNROUTABLE)); // Ignored for both networks
    BOOST_CHECK(IsReachable(NET_INTERNAL));
}

CNetAddr UtilBuildAddress(unsigned char p1, unsigned char p2, unsigned char p3, unsigned char p4)
{
    unsigned char ip[] = {p1, p2, p3, p4};

    struct sockaddr_in sa;
    memset(&sa, 0, sizeof(sockaddr_in)); // initialize the memory block
    memcpy(&(sa.sin_addr), &ip, sizeof(ip));
    return CNetAddr(sa.sin_addr);
}


BOOST_AUTO_TEST_CASE(LimitedAndReachable_CNetAddr)
{
    CNetAddr addr = UtilBuildAddress(0x001, 0x001, 0x001, 0x001); // 1.1.1.1

    SetReachable(NET_IPV4, true);
    BOOST_CHECK(IsReachable(addr));

    SetReachable(NET_IPV4, false);
    BOOST_CHECK(!IsReachable(addr));

    SetReachable(NET_IPV4, true); // have to reset this, because this is stateful.
}


BOOST_AUTO_TEST_CASE(LocalAddress_BasicLifecycle)
{
    CService addr = CService(UtilBuildAddress(0x002, 0x001, 0x001, 0x001), 1000); // 2.1.1.1:1000

    SetReachable(NET_IPV4, true);

    BOOST_CHECK(!IsLocal(addr));
    BOOST_CHECK(AddLocal(addr, 1000));
    BOOST_CHECK(IsLocal(addr));

    RemoveLocal(addr);
    BOOST_CHECK(!IsLocal(addr));
}

BOOST_AUTO_TEST_SUITE_END()