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net: save the network type explicitly in CNetAddr

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Before this change, we would analyze the contents of `CNetAddr::ip[16]`
in order to tell which type is an address. Change this by introducing a
new member `CNetAddr::m_net` that explicitly tells the type of the
address.

This is necessary because in BIP155 we will not be able to tell the
address type by just looking at its raw representation (e.g. both TORv3
and I2P are "seemingly random" 32 bytes).

As a side effect of this change we no longer need to store IPv4
addresses encoded as IPv6 addresses - we can store them in proper 4
bytes (will be done in a separate commit). Also the code gets
somewhat simplified - instead of
`memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0` we can use
`m_net == NET_IPV4`.

Co-authored-by: Carl Dong <contact@carldong.me>
This commit is contained in:
Vasil Dimov
2020-05-14 17:03:11 +02:00
parent 100c64a95b
commit bcfebb6d55
3 changed files with 91 additions and 40 deletions
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13
src/test/netbase_tests.cpp
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@@ -138,6 +138,14 @@ BOOST_AUTO_TEST_CASE(onioncat_test)
}
BOOST_AUTO_TEST_CASE(embedded_test)
{
CNetAddr addr1(ResolveIP("1.2.3.4"));
CNetAddr addr2(ResolveIP("::FFFF:0102:0304"));
BOOST_CHECK(addr2.IsIPv4());
BOOST_CHECK_EQUAL(addr1.ToString(), addr2.ToString());
}
BOOST_AUTO_TEST_CASE(subnet_test)
{
@@ -158,12 +166,13 @@ BOOST_AUTO_TEST_CASE(subnet_test)
BOOST_CHECK(ResolveSubNet("1.2.2.1/24").Match(ResolveIP("1.2.2.4")));
BOOST_CHECK(ResolveSubNet("1.2.2.110/31").Match(ResolveIP("1.2.2.111")));
BOOST_CHECK(ResolveSubNet("1.2.2.20/26").Match(ResolveIP("1.2.2.63")));
// All-Matching IPv6 Matches arbitrary IPv4 and IPv6
// All-Matching IPv6 Matches arbitrary IPv6
BOOST_CHECK(ResolveSubNet("::/0").Match(ResolveIP("1:2:3:4:5:6:7:1234")));
// But not `::` or `0.0.0.0` because they are considered invalid addresses
BOOST_CHECK(!ResolveSubNet("::/0").Match(ResolveIP("::")));
BOOST_CHECK(!ResolveSubNet("::/0").Match(ResolveIP("0.0.0.0")));
BOOST_CHECK(ResolveSubNet("::/0").Match(ResolveIP("1.2.3.4")));
// Addresses from one network (IPv4) don't belong to subnets of another network (IPv6)
BOOST_CHECK(!ResolveSubNet("::/0").Match(ResolveIP("1.2.3.4")));
// All-Matching IPv4 does not Match IPv6
BOOST_CHECK(!ResolveSubNet("0.0.0.0/0").Match(ResolveIP("1:2:3:4:5:6:7:1234")));
// Invalid subnets Match nothing (not even invalid addresses)