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Fix two problems in CSubNet parsing

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Fix two CSubNet constructor problems:

- The use of `/x` where 8 does not divide x was broken, due to a
  bit-order issue

- The use of e.g. `1.2.3.4/24` where the netmasked bits in the network
  are not 0 was broken. Fix this by explicitly normalizing the netwok
  according to the bitmask.

Also add tests for these cases.

Fixes #6179. Thanks to @jonasschnelli for reporting and initial fix.

Rebased-From: b45c50ce51
Github-Pull: #6186
This commit is contained in:
Wladimir J. van der Laan 2015-05-26 08:59:20 +02:00
parent e4a7d51537
commit ae3d8f371a
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GPG Key ID: 74810B012346C9A6
2 changed files with 10 additions and 1 deletions
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6
src/netbase.cpp
View File

@ -1222,7 +1222,7 @@ CSubNet::CSubNet(const std::string &strSubnet, bool fAllowLookup)
n += astartofs*8;
// Clear bits [n..127]
for (; n < 128; ++n)
netmask[n>>3] &= ~(1<<(n&7));
netmask[n>>3] &= ~(1<<(7-(n&7)));
}
else
{
@ -1249,6 +1249,10 @@ CSubNet::CSubNet(const std::string &strSubnet, bool fAllowLookup)
{
valid = false;
}
// Normalize network according to netmask
for(int x=0; x<16; ++x)
network.ip[x] &= netmask[x];
}
bool CSubNet::Match(const CNetAddr &addr) const

5
src/test/netbase_tests.cpp
View File

@ -116,6 +116,11 @@ BOOST_AUTO_TEST_CASE(subnet_test)
BOOST_CHECK(CSubNet("1:2:3:4:5:6:7:8").Match(CNetAddr("1:2:3:4:5:6:7:8")));
BOOST_CHECK(!CSubNet("1:2:3:4:5:6:7:8").Match(CNetAddr("1:2:3:4:5:6:7:9")));
BOOST_CHECK(CSubNet("1:2:3:4:5:6:7:0/112").Match(CNetAddr("1:2:3:4:5:6:7:1234")));
BOOST_CHECK(CSubNet("192.168.0.1/24").Match(CNetAddr("192.168.0.2")));
BOOST_CHECK(CSubNet("192.168.0.20/29").Match(CNetAddr("192.168.0.18")));
BOOST_CHECK(CSubNet("1.2.2.1/24").Match(CNetAddr("1.2.2.4")));
BOOST_CHECK(CSubNet("1.2.2.110/31").Match(CNetAddr("1.2.2.111")));
BOOST_CHECK(CSubNet("1.2.2.20/26").Match(CNetAddr("1.2.2.63")));
// All-Matching IPv6 Matches arbitrary IPv4 and IPv6
BOOST_CHECK(CSubNet("::/0").Match(CNetAddr("1:2:3:4:5:6:7:1234")));
BOOST_CHECK(CSubNet("::/0").Match(CNetAddr("1.2.3.4")));