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net: don't accept non-left-contiguous netmasks

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A netmask that contains 1-bits after 0-bits (the 1-bits are not
contiguous on the left side) is invalid [1] [2].

The code before this PR used to parse and accept such
non-left-contiguous netmasks. However, a coming change that will alter
`CNetAddr::ip` to have flexible size would make juggling with such
netmasks more difficult, thus drop support for those.

[1] https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#Subnet_masks
[2] https://tools.ietf.org/html/rfc4632#section-5.1
This commit is contained in:
Vasil Dimov
2020-08-24 21:03:31 +02:00
parent cb1ee1551c
commit 1ea57ad674
3 changed files with 48 additions and 54 deletions
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8
src/test/netbase_tests.cpp
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@@ -290,11 +290,13 @@ BOOST_AUTO_TEST_CASE(subnet_test)
BOOST_CHECK_EQUAL(subnet.ToString(), "1::/16");
subnet = ResolveSubNet("1:2:3:4:5:6:7:8/0000:0000:0000:0000:0000:0000:0000:0000");
BOOST_CHECK_EQUAL(subnet.ToString(), "::/0");
// Invalid netmasks (with 1-bits after 0-bits)
subnet = ResolveSubNet("1.2.3.4/255.255.232.0");
BOOST_CHECK_EQUAL(subnet.ToString(), "1.2.0.0/255.255.232.0");
BOOST_CHECK(!subnet.IsValid());
subnet = ResolveSubNet("1.2.3.4/255.0.255.255");
BOOST_CHECK(!subnet.IsValid());
subnet = ResolveSubNet("1:2:3:4:5:6:7:8/ffff:ffff:ffff:fffe:ffff:ffff:ffff:ff0f");
BOOST_CHECK_EQUAL(subnet.ToString(), "1:2:3:4:5:6:7:8/ffff:ffff:ffff:fffe:ffff:ffff:ffff:ff0f");
BOOST_CHECK(!subnet.IsValid());
}
BOOST_AUTO_TEST_CASE(netbase_getgroup)