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net: change CNetAddr::ip to have flexible size

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Before this change `CNetAddr::ip` was a fixed-size array of 16 bytes,
not being able to store larger addresses (e.g. TORv3) and encoded
smaller ones as 16-byte IPv6 addresses.

Change its type to `prevector`, so that it can hold larger addresses and
do not disguise non-IPv6 addresses as IPv6. So the IPv4 address
`1.2.3.4` is now encoded as `01020304` instead of
`00000000000000000000FFFF01020304`.

Rename `CNetAddr::ip` to `CNetAddr::m_addr` because it is not an "IP" or
"IP address" (TOR addresses are not IP addresses).

In order to preserve backward compatibility with serialization (where
e.g. `1.2.3.4` is serialized as `00000000000000000000FFFF01020304`)
introduce `CNetAddr` dedicated legacy serialize/unserialize methods.

Adjust `CSubNet` accordingly. Still use `CSubNet::netmask[]` of fixed 16
bytes, but use the first 4 for IPv4 (not the last 4). Only allow
subnetting for IPv4 and IPv6.

Co-authored-by: Carl Dong <contact@carldong.me>
This commit is contained in:
Vasil Dimov
2020-08-24 21:34:26 +02:00
parent 1ea57ad674
commit 102867c587
10 changed files with 452 additions and 217 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
src/test/fuzz/asmap.cpp
View File

@@ -33,7 +33,7 @@ void test_one_input(const std::vector<uint8_t>& buffer)
if (buffer.size() < 1 + 3 + 4) return;
int asmap_size = 3 + (buffer[0] & 127);
bool ipv6 = buffer[0] & 128;
int addr_size = ipv6 ? 16 : 4;
const size_t addr_size = ipv6 ? ADDR_IPV6_SIZE : ADDR_IPV4_SIZE;
if (buffer.size() < size_t(1 + asmap_size + addr_size)) return;
std::vector<bool> asmap = ipv6 ? IPV6_PREFIX_ASMAP : IPV4_PREFIX_ASMAP;
asmap.reserve(asmap.size() + 8 * asmap_size);
@@ -43,7 +43,17 @@ void test_one_input(const std::vector<uint8_t>& buffer)
}
}
if (!SanityCheckASMap(asmap)) return;
const uint8_t* addr_data = buffer.data() + 1 + asmap_size;
CNetAddr net_addr;
net_addr.SetRaw(ipv6 ? NET_IPV6 : NET_IPV4, buffer.data() + 1 + asmap_size);
if (ipv6) {
assert(addr_size == ADDR_IPV6_SIZE);
net_addr.SetLegacyIPv6(Span<const uint8_t>(addr_data, addr_size));
} else {
assert(addr_size == ADDR_IPV4_SIZE);
in_addr ipv4;
memcpy(&ipv4, addr_data, addr_size);
net_addr.SetIP(CNetAddr{ipv4});
}
(void)net_addr.GetMappedAS(asmap);
}

5
src/test/fuzz/netaddress.cpp
View File

@@ -17,9 +17,6 @@ void test_one_input(const std::vector<uint8_t>& buffer)
FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
const CNetAddr net_addr = ConsumeNetAddr(fuzzed_data_provider);
for (int i = 0; i < 15; ++i) {
(void)net_addr.GetByte(i);
}
(void)net_addr.GetHash();
(void)net_addr.GetNetClass();
if (net_addr.GetNetwork() == Network::NET_IPV4) {
@@ -78,7 +75,7 @@ void test_one_input(const std::vector<uint8_t>& buffer)
(void)net_addr.ToString();
(void)net_addr.ToStringIP();
const CSubNet sub_net{net_addr, fuzzed_data_provider.ConsumeIntegral<int32_t>()};
const CSubNet sub_net{net_addr, fuzzed_data_provider.ConsumeIntegral<uint8_t>()};
(void)sub_net.IsValid();
(void)sub_net.ToString();

2
src/test/fuzz/util.h
View File

@@ -257,7 +257,7 @@ CNetAddr ConsumeNetAddr(FuzzedDataProvider& fuzzed_data_provider) noexcept
CSubNet ConsumeSubNet(FuzzedDataProvider& fuzzed_data_provider) noexcept
{
return {ConsumeNetAddr(fuzzed_data_provider), fuzzed_data_provider.ConsumeIntegral<int32_t>()};
return {ConsumeNetAddr(fuzzed_data_provider), fuzzed_data_provider.ConsumeIntegral<uint8_t>()};
}
void InitializeFuzzingContext(const std::string& chain_name = CBaseChainParams::REGTEST)

74
src/test/net_tests.cpp
View File

@@ -13,8 +13,10 @@
#include <streams.h>
#include <test/util/setup_common.h>
#include <util/memory.h>
#include <util/strencodings.h>
#include <util/string.h>
#include <util/system.h>
#include <version.h>
#include <boost/test/unit_test.hpp>
@@ -193,6 +195,78 @@ BOOST_AUTO_TEST_CASE(cnode_simple_test)
BOOST_CHECK(pnode2->fFeeler == false);
}
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_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_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_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_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_EQUAL(addr.ToString(), "1122:3344:5566:7788:9900:aabb:ccdd:eeff");
// TORv2
addr.SetSpecial("6hzph5hv6337r6p2.onion");
BOOST_REQUIRE(addr.IsValid());
BOOST_REQUIRE(addr.IsTor());
BOOST_CHECK(!addr.IsBindAny());
BOOST_CHECK_EQUAL(addr.ToString(), "6hzph5hv6337r6p2.onion");
// Internal
addr.SetInternal("esffpp");
BOOST_REQUIRE(!addr.IsValid()); // "internal" is considered invalid
BOOST_REQUIRE(addr.IsInternal());
BOOST_CHECK(!addr.IsBindAny());
BOOST_CHECK_EQUAL(addr.ToString(), "esffpvrt3wpeaygy.internal");
}
BOOST_AUTO_TEST_CASE(cnetaddr_serialize)
{
CNetAddr addr;
CDataStream s(SER_NETWORK, PROTOCOL_VERSION);
addr.SetInternal("a");
s << addr;
BOOST_CHECK_EQUAL(HexStr(s), "fd6b88c08724ca978112ca1bbdcafac2");
s.clear();
}
// prior to PR #14728, this test triggers an undefined behavior
BOOST_AUTO_TEST_CASE(ipv4_peer_with_ipv6_addrMe_test)
{

9
src/test/netbase_tests.cpp
View File

@@ -185,6 +185,7 @@ BOOST_AUTO_TEST_CASE(subnet_test)
BOOST_CHECK(!ResolveSubNet("1.2.3.0/-1").IsValid());
BOOST_CHECK(ResolveSubNet("1.2.3.0/32").IsValid());
BOOST_CHECK(!ResolveSubNet("1.2.3.0/33").IsValid());
BOOST_CHECK(!ResolveSubNet("1.2.3.0/300").IsValid());
BOOST_CHECK(ResolveSubNet("1:2:3:4:5:6:7:8/0").IsValid());
BOOST_CHECK(ResolveSubNet("1:2:3:4:5:6:7:8/33").IsValid());
BOOST_CHECK(!ResolveSubNet("1:2:3:4:5:6:7:8/-1").IsValid());
@@ -216,6 +217,11 @@ BOOST_AUTO_TEST_CASE(subnet_test)
BOOST_CHECK(CSubNet(ResolveIP("1:2:3:4:5:6:7:8")).Match(ResolveIP("1:2:3:4:5:6:7:8")));
BOOST_CHECK(!CSubNet(ResolveIP("1:2:3:4:5:6:7:8")).Match(ResolveIP("1:2:3:4:5:6:7:9")));
BOOST_CHECK(CSubNet(ResolveIP("1:2:3:4:5:6:7:8")).ToString() == "1:2:3:4:5:6:7:8/128");
// 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());
subnet = ResolveSubNet("1.2.3.4/255.255.255.255");
BOOST_CHECK_EQUAL(subnet.ToString(), "1.2.3.4/32");
@@ -430,7 +436,8 @@ 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));
BOOST_CHECK(LookupSubNet(std::string("5wyqrzbvrdsumnok.onion", 22), 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\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));