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net: allow CSubNet of non-IP networks

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Allow creation of valid `CSubNet` objects of non-IP networks and only
match the single address they were created from (like /32 for IPv4 or
/128 for IPv6).

This fixes a deficiency in `CConnman::DisconnectNode(const CNetAddr& addr)`
and in `BanMan` which assume that creating a subnet from any address
using the `CSubNet(CNetAddr)` constructor would later match that address
only. Before this change a non-IP subnet would be invalid and would not
match any address.

Github-Pull: #20852
Rebased-From: 94d335da7f
This commit is contained in:
Vasil Dimov
2021-01-04 18:37:52 +01:00
committed by MarcoFalke
parent 15877d160c
commit c33fbab25c
3 changed files with 107 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
src/test/netbase_tests.cpp
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@@ -224,8 +224,22 @@ BOOST_AUTO_TEST_CASE(subnet_test)
// IPv4 address with IPv6 netmask or the other way around.
BOOST_CHECK(!CSubNet(ResolveIP("1.1.1.1"), ResolveIP("ffff::")).IsValid());
BOOST_CHECK(!CSubNet(ResolveIP("::1"), ResolveIP("255.0.0.0")).IsValid());
// Can't subnet TOR (or any other non-IPv4 and non-IPv6 network).
BOOST_CHECK(!CSubNet(ResolveIP("5wyqrzbvrdsumnok.onion"), ResolveIP("255.0.0.0")).IsValid());
// Create Non-IP subnets.
const CNetAddr tor_addr{
ResolveIP("pg6mmjiyjmcrsslvykfwnntlaru7p5svn6y2ymmju6nubxndf4pscryd.onion")};
subnet = CSubNet(tor_addr);
BOOST_CHECK(subnet.IsValid());
BOOST_CHECK_EQUAL(subnet.ToString(), tor_addr.ToString());
BOOST_CHECK(subnet.Match(tor_addr));
BOOST_CHECK(
!subnet.Match(ResolveIP("kpgvmscirrdqpekbqjsvw5teanhatztpp2gl6eee4zkowvwfxwenqaid.onion")));
BOOST_CHECK(!subnet.Match(ResolveIP("1.2.3.4")));
BOOST_CHECK(!CSubNet(tor_addr, 200).IsValid());
BOOST_CHECK(!CSubNet(tor_addr, ResolveIP("255.0.0.0")).IsValid());
subnet = ResolveSubNet("1.2.3.4/255.255.255.255");
BOOST_CHECK_EQUAL(subnet.ToString(), "1.2.3.4/32");
@@ -440,8 +454,7 @@ BOOST_AUTO_TEST_CASE(netbase_dont_resolve_strings_with_embedded_nul_characters)
BOOST_CHECK(!LookupSubNet(std::string("1.2.3.0/24\0", 11), ret));
BOOST_CHECK(!LookupSubNet(std::string("1.2.3.0/24\0example.com", 22), ret));
BOOST_CHECK(!LookupSubNet(std::string("1.2.3.0/24\0example.com\0", 23), ret));
// We only do subnetting for IPv4 and IPv6
BOOST_CHECK(!LookupSubNet(std::string("5wyqrzbvrdsumnok.onion", 22), ret));
BOOST_CHECK(LookupSubNet(std::string("5wyqrzbvrdsumnok.onion", 22), ret));
BOOST_CHECK(!LookupSubNet(std::string("5wyqrzbvrdsumnok.onion\0", 23), ret));
BOOST_CHECK(!LookupSubNet(std::string("5wyqrzbvrdsumnok.onion\0example.com", 34), ret));
BOOST_CHECK(!LookupSubNet(std::string("5wyqrzbvrdsumnok.onion\0example.com\0", 35), ret));