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zcash-patched-for-explorer
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Merge pull request #6186 

b45c50c Fix two problems in CSubNet parsing (Wladimir J. van der Laan)
19e8d7b Simplify code for CSubnet (Wladimir J. van der Laan)
This commit is contained in:
Wladimir J. van der Laan 2015-05-27 09:07:11 +02:00
parent 165e323d85 b45c50ce51
commit 182686cdbd
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GPG Key ID: 74810B012346C9A6
3 changed files with 18 additions and 9 deletions
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20
src/netbase.cpp
View File

@ -1252,15 +1252,15 @@ CSubNet::CSubNet(const std::string &strSubnet, bool fAllowLookup)
std::string strNetmask = strSubnet.substr(slash + 1);
int32_t n;
// IPv4 addresses start at offset 12, and first 12 bytes must match, so just offset n
int noffset = network.IsIPv4() ? (12 * 8) : 0;
const int astartofs = network.IsIPv4() ? 12 : 0;
if (ParseInt32(strNetmask, &n)) // If valid number, assume /24 symtex
{
if(n >= 0 && n <= (128 - noffset)) // Only valid if in range of bits of address
if(n >= 0 && n <= (128 - astartofs*8)) // Only valid if in range of bits of address
{
n += noffset;
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
{
@ -1271,12 +1271,10 @@ CSubNet::CSubNet(const std::string &strSubnet, bool fAllowLookup)
{
if (LookupHost(strNetmask.c_str(), vIP, 1, false)) // Never allow lookup for netmask
{
// Remember: GetByte returns bytes in reversed order
// Copy only the *last* four bytes in case of IPv4, the rest of the mask should stay 1's as
// we don't want pchIPv4 to be part of the mask.
int asize = network.IsIPv4() ? 4 : 16;
for(int x=0; x<asize; ++x)
netmask[15-x] = vIP[0].GetByte(x);
for(int x=astartofs; x<16; ++x)
netmask[x] = vIP[0].ip[x];
}
else
{
@ -1289,6 +1287,10 @@ 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
@ -1296,7 +1298,7 @@ bool CSubNet::Match(const CNetAddr &addr) const
if (!valid || !addr.IsValid())
return false;
for(int x=0; x<16; ++x)
if ((addr.GetByte(x) & netmask[15-x]) != network.GetByte(x))
if ((addr.ip[x] & netmask[x]) != network.ip[x])
return false;
return true;
}

2
src/netbase.h
View File

@ -100,6 +100,8 @@ class CNetAddr
inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
READWRITE(FLATDATA(ip));
}
friend class CSubNet;
};
class CSubNet

5
src/test/netbase_tests.cpp
View File

@ -117,6 +117,11 @@ 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")));