6f04264bbb
Reachable from either place where SetIP is used when our best-guess
addrLocal for a peer is IPv4, but the peer tells us it's reaching us at
an IPv6 address.
In that case, SetIP turns an IPv4 address into an IPv6 address without
setting the scopeId, which is subsequently read in GetSockAddr during
CNetAddr::ToStringIP and passed to getnameinfo. Fix by ensuring every
constructor initializes the scopeId field with something.
Github-Pull: #14728
Rebased-From: b7b36decaf
712 lines
19 KiB
C++
712 lines
19 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2018 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <netaddress.h>
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#include <hash.h>
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#include <utilstrencodings.h>
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#include <tinyformat.h>
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static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
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static const unsigned char pchOnionCat[] = {0xFD,0x87,0xD8,0x7E,0xEB,0x43};
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// 0xFD + sha256("bitcoin")[0:5]
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static const unsigned char g_internal_prefix[] = { 0xFD, 0x6B, 0x88, 0xC0, 0x87, 0x24 };
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CNetAddr::CNetAddr()
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{
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memset(ip, 0, sizeof(ip));
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}
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void CNetAddr::SetIP(const CNetAddr& ipIn)
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{
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memcpy(ip, ipIn.ip, sizeof(ip));
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}
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void CNetAddr::SetRaw(Network network, const uint8_t *ip_in)
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{
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switch(network)
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{
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case NET_IPV4:
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memcpy(ip, pchIPv4, 12);
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memcpy(ip+12, ip_in, 4);
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break;
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case NET_IPV6:
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memcpy(ip, ip_in, 16);
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break;
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default:
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assert(!"invalid network");
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}
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}
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bool CNetAddr::SetInternal(const std::string &name)
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{
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if (name.empty()) {
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return false;
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}
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unsigned char hash[32] = {};
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CSHA256().Write((const unsigned char*)name.data(), name.size()).Finalize(hash);
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memcpy(ip, g_internal_prefix, sizeof(g_internal_prefix));
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memcpy(ip + sizeof(g_internal_prefix), hash, sizeof(ip) - sizeof(g_internal_prefix));
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return true;
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}
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bool CNetAddr::SetSpecial(const std::string &strName)
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{
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if (strName.size()>6 && strName.substr(strName.size() - 6, 6) == ".onion") {
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std::vector<unsigned char> vchAddr = DecodeBase32(strName.substr(0, strName.size() - 6).c_str());
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if (vchAddr.size() != 16-sizeof(pchOnionCat))
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return false;
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memcpy(ip, pchOnionCat, sizeof(pchOnionCat));
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for (unsigned int i=0; i<16-sizeof(pchOnionCat); i++)
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ip[i + sizeof(pchOnionCat)] = vchAddr[i];
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return true;
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}
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return false;
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}
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CNetAddr::CNetAddr(const struct in_addr& ipv4Addr)
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{
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SetRaw(NET_IPV4, (const uint8_t*)&ipv4Addr);
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}
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CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr, const uint32_t scope)
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{
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SetRaw(NET_IPV6, (const uint8_t*)&ipv6Addr);
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scopeId = scope;
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}
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unsigned int CNetAddr::GetByte(int n) const
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{
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return ip[15-n];
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}
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bool CNetAddr::IsIPv4() const
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{
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return (memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0);
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}
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bool CNetAddr::IsIPv6() const
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{
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return (!IsIPv4() && !IsTor() && !IsInternal());
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}
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bool CNetAddr::IsRFC1918() const
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{
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return IsIPv4() && (
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GetByte(3) == 10 ||
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(GetByte(3) == 192 && GetByte(2) == 168) ||
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(GetByte(3) == 172 && (GetByte(2) >= 16 && GetByte(2) <= 31)));
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}
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bool CNetAddr::IsRFC2544() const
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{
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return IsIPv4() && GetByte(3) == 198 && (GetByte(2) == 18 || GetByte(2) == 19);
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}
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bool CNetAddr::IsRFC3927() const
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{
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return IsIPv4() && (GetByte(3) == 169 && GetByte(2) == 254);
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}
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bool CNetAddr::IsRFC6598() const
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{
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return IsIPv4() && GetByte(3) == 100 && GetByte(2) >= 64 && GetByte(2) <= 127;
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}
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bool CNetAddr::IsRFC5737() const
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{
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return IsIPv4() && ((GetByte(3) == 192 && GetByte(2) == 0 && GetByte(1) == 2) ||
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(GetByte(3) == 198 && GetByte(2) == 51 && GetByte(1) == 100) ||
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(GetByte(3) == 203 && GetByte(2) == 0 && GetByte(1) == 113));
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}
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bool CNetAddr::IsRFC3849() const
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{
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return GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x0D && GetByte(12) == 0xB8;
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}
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bool CNetAddr::IsRFC3964() const
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{
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return (GetByte(15) == 0x20 && GetByte(14) == 0x02);
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}
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bool CNetAddr::IsRFC6052() const
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{
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static const unsigned char pchRFC6052[] = {0,0x64,0xFF,0x9B,0,0,0,0,0,0,0,0};
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return (memcmp(ip, pchRFC6052, sizeof(pchRFC6052)) == 0);
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}
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bool CNetAddr::IsRFC4380() const
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{
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return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0 && GetByte(12) == 0);
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}
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bool CNetAddr::IsRFC4862() const
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{
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static const unsigned char pchRFC4862[] = {0xFE,0x80,0,0,0,0,0,0};
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return (memcmp(ip, pchRFC4862, sizeof(pchRFC4862)) == 0);
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}
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bool CNetAddr::IsRFC4193() const
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{
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return ((GetByte(15) & 0xFE) == 0xFC);
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}
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bool CNetAddr::IsRFC6145() const
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{
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static const unsigned char pchRFC6145[] = {0,0,0,0,0,0,0,0,0xFF,0xFF,0,0};
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return (memcmp(ip, pchRFC6145, sizeof(pchRFC6145)) == 0);
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}
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bool CNetAddr::IsRFC4843() const
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{
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return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10);
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}
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bool CNetAddr::IsTor() const
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{
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return (memcmp(ip, pchOnionCat, sizeof(pchOnionCat)) == 0);
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}
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bool CNetAddr::IsLocal() const
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{
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// IPv4 loopback
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if (IsIPv4() && (GetByte(3) == 127 || GetByte(3) == 0))
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return true;
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// IPv6 loopback (::1/128)
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static const unsigned char pchLocal[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
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if (memcmp(ip, pchLocal, 16) == 0)
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return true;
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return false;
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}
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bool CNetAddr::IsValid() const
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{
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// Cleanup 3-byte shifted addresses caused by garbage in size field
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// of addr messages from versions before 0.2.9 checksum.
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// Two consecutive addr messages look like this:
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// header20 vectorlen3 addr26 addr26 addr26 header20 vectorlen3 addr26 addr26 addr26...
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// so if the first length field is garbled, it reads the second batch
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// of addr misaligned by 3 bytes.
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if (memcmp(ip, pchIPv4+3, sizeof(pchIPv4)-3) == 0)
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return false;
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// unspecified IPv6 address (::/128)
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unsigned char ipNone6[16] = {};
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if (memcmp(ip, ipNone6, 16) == 0)
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return false;
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// documentation IPv6 address
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if (IsRFC3849())
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return false;
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if (IsInternal())
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return false;
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if (IsIPv4())
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{
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// INADDR_NONE
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uint32_t ipNone = INADDR_NONE;
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if (memcmp(ip+12, &ipNone, 4) == 0)
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return false;
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// 0
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ipNone = 0;
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if (memcmp(ip+12, &ipNone, 4) == 0)
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return false;
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}
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return true;
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}
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bool CNetAddr::IsRoutable() const
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{
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return IsValid() && !(IsRFC1918() || IsRFC2544() || IsRFC3927() || IsRFC4862() || IsRFC6598() || IsRFC5737() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsLocal() || IsInternal());
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}
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bool CNetAddr::IsInternal() const
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{
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return memcmp(ip, g_internal_prefix, sizeof(g_internal_prefix)) == 0;
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}
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enum Network CNetAddr::GetNetwork() const
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{
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if (IsInternal())
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return NET_INTERNAL;
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if (!IsRoutable())
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return NET_UNROUTABLE;
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if (IsIPv4())
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return NET_IPV4;
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if (IsTor())
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return NET_ONION;
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return NET_IPV6;
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}
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std::string CNetAddr::ToStringIP() const
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{
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if (IsTor())
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return EncodeBase32(&ip[6], 10) + ".onion";
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if (IsInternal())
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return EncodeBase32(ip + sizeof(g_internal_prefix), sizeof(ip) - sizeof(g_internal_prefix)) + ".internal";
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CService serv(*this, 0);
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struct sockaddr_storage sockaddr;
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socklen_t socklen = sizeof(sockaddr);
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if (serv.GetSockAddr((struct sockaddr*)&sockaddr, &socklen)) {
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char name[1025] = "";
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if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), nullptr, 0, NI_NUMERICHOST))
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return std::string(name);
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}
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if (IsIPv4())
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return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));
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else
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return strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
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GetByte(15) << 8 | GetByte(14), GetByte(13) << 8 | GetByte(12),
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GetByte(11) << 8 | GetByte(10), GetByte(9) << 8 | GetByte(8),
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GetByte(7) << 8 | GetByte(6), GetByte(5) << 8 | GetByte(4),
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GetByte(3) << 8 | GetByte(2), GetByte(1) << 8 | GetByte(0));
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}
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std::string CNetAddr::ToString() const
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{
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return ToStringIP();
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}
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bool operator==(const CNetAddr& a, const CNetAddr& b)
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{
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return (memcmp(a.ip, b.ip, 16) == 0);
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}
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bool operator<(const CNetAddr& a, const CNetAddr& b)
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{
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return (memcmp(a.ip, b.ip, 16) < 0);
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}
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bool CNetAddr::GetInAddr(struct in_addr* pipv4Addr) const
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{
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if (!IsIPv4())
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return false;
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memcpy(pipv4Addr, ip+12, 4);
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return true;
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}
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bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const
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{
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if (!IsIPv6()) {
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return false;
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}
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memcpy(pipv6Addr, ip, 16);
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return true;
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}
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// get canonical identifier of an address' group
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// no two connections will be attempted to addresses with the same group
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std::vector<unsigned char> CNetAddr::GetGroup() const
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{
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std::vector<unsigned char> vchRet;
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int nClass = NET_IPV6;
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int nStartByte = 0;
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int nBits = 16;
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// all local addresses belong to the same group
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if (IsLocal())
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{
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nClass = 255;
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nBits = 0;
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}
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// all internal-usage addresses get their own group
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if (IsInternal())
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{
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nClass = NET_INTERNAL;
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nStartByte = sizeof(g_internal_prefix);
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nBits = (sizeof(ip) - sizeof(g_internal_prefix)) * 8;
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}
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// all other unroutable addresses belong to the same group
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else if (!IsRoutable())
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{
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nClass = NET_UNROUTABLE;
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nBits = 0;
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}
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// for IPv4 addresses, '1' + the 16 higher-order bits of the IP
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// includes mapped IPv4, SIIT translated IPv4, and the well-known prefix
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else if (IsIPv4() || IsRFC6145() || IsRFC6052())
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{
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nClass = NET_IPV4;
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nStartByte = 12;
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}
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// for 6to4 tunnelled addresses, use the encapsulated IPv4 address
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else if (IsRFC3964())
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{
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nClass = NET_IPV4;
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nStartByte = 2;
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}
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// for Teredo-tunnelled IPv6 addresses, use the encapsulated IPv4 address
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else if (IsRFC4380())
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{
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vchRet.push_back(NET_IPV4);
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vchRet.push_back(GetByte(3) ^ 0xFF);
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vchRet.push_back(GetByte(2) ^ 0xFF);
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return vchRet;
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}
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else if (IsTor())
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{
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nClass = NET_ONION;
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nStartByte = 6;
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nBits = 4;
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}
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// for he.net, use /36 groups
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else if (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x04 && GetByte(12) == 0x70)
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nBits = 36;
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// for the rest of the IPv6 network, use /32 groups
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else
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nBits = 32;
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vchRet.push_back(nClass);
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while (nBits >= 8)
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{
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vchRet.push_back(GetByte(15 - nStartByte));
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nStartByte++;
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nBits -= 8;
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}
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if (nBits > 0)
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vchRet.push_back(GetByte(15 - nStartByte) | ((1 << (8 - nBits)) - 1));
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return vchRet;
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}
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uint64_t CNetAddr::GetHash() const
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{
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uint256 hash = Hash(&ip[0], &ip[16]);
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uint64_t nRet;
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memcpy(&nRet, &hash, sizeof(nRet));
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return nRet;
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}
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// private extensions to enum Network, only returned by GetExtNetwork,
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// and only used in GetReachabilityFrom
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static const int NET_UNKNOWN = NET_MAX + 0;
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static const int NET_TEREDO = NET_MAX + 1;
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int static GetExtNetwork(const CNetAddr *addr)
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{
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if (addr == nullptr)
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return NET_UNKNOWN;
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if (addr->IsRFC4380())
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return NET_TEREDO;
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return addr->GetNetwork();
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}
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/** Calculates a metric for how reachable (*this) is from a given partner */
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int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const
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{
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enum Reachability {
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REACH_UNREACHABLE,
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REACH_DEFAULT,
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REACH_TEREDO,
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REACH_IPV6_WEAK,
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REACH_IPV4,
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REACH_IPV6_STRONG,
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REACH_PRIVATE
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};
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if (!IsRoutable() || IsInternal())
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return REACH_UNREACHABLE;
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int ourNet = GetExtNetwork(this);
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int theirNet = GetExtNetwork(paddrPartner);
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bool fTunnel = IsRFC3964() || IsRFC6052() || IsRFC6145();
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switch(theirNet) {
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case NET_IPV4:
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switch(ourNet) {
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default: return REACH_DEFAULT;
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case NET_IPV4: return REACH_IPV4;
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}
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case NET_IPV6:
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switch(ourNet) {
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default: return REACH_DEFAULT;
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case NET_TEREDO: return REACH_TEREDO;
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case NET_IPV4: return REACH_IPV4;
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case NET_IPV6: return fTunnel ? REACH_IPV6_WEAK : REACH_IPV6_STRONG; // only prefer giving our IPv6 address if it's not tunnelled
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}
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case NET_ONION:
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switch(ourNet) {
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default: return REACH_DEFAULT;
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case NET_IPV4: return REACH_IPV4; // Tor users can connect to IPv4 as well
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case NET_ONION: return REACH_PRIVATE;
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}
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case NET_TEREDO:
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switch(ourNet) {
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default: return REACH_DEFAULT;
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case NET_TEREDO: return REACH_TEREDO;
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case NET_IPV6: return REACH_IPV6_WEAK;
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case NET_IPV4: return REACH_IPV4;
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}
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case NET_UNKNOWN:
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case NET_UNROUTABLE:
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default:
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switch(ourNet) {
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default: return REACH_DEFAULT;
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case NET_TEREDO: return REACH_TEREDO;
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case NET_IPV6: return REACH_IPV6_WEAK;
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case NET_IPV4: return REACH_IPV4;
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case NET_ONION: return REACH_PRIVATE; // either from Tor, or don't care about our address
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}
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}
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}
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CService::CService() : port(0)
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{
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}
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CService::CService(const CNetAddr& cip, unsigned short portIn) : CNetAddr(cip), port(portIn)
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{
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}
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CService::CService(const struct in_addr& ipv4Addr, unsigned short portIn) : CNetAddr(ipv4Addr), port(portIn)
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{
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}
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CService::CService(const struct in6_addr& ipv6Addr, unsigned short portIn) : CNetAddr(ipv6Addr), port(portIn)
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{
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}
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CService::CService(const struct sockaddr_in& addr) : CNetAddr(addr.sin_addr), port(ntohs(addr.sin_port))
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{
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assert(addr.sin_family == AF_INET);
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}
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CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr, addr.sin6_scope_id), port(ntohs(addr.sin6_port))
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{
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assert(addr.sin6_family == AF_INET6);
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}
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|
|
bool CService::SetSockAddr(const struct sockaddr *paddr)
|
|
{
|
|
switch (paddr->sa_family) {
|
|
case AF_INET:
|
|
*this = CService(*(const struct sockaddr_in*)paddr);
|
|
return true;
|
|
case AF_INET6:
|
|
*this = CService(*(const struct sockaddr_in6*)paddr);
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
unsigned short CService::GetPort() const
|
|
{
|
|
return port;
|
|
}
|
|
|
|
bool operator==(const CService& a, const CService& b)
|
|
{
|
|
return static_cast<CNetAddr>(a) == static_cast<CNetAddr>(b) && a.port == b.port;
|
|
}
|
|
|
|
bool operator<(const CService& a, const CService& b)
|
|
{
|
|
return static_cast<CNetAddr>(a) < static_cast<CNetAddr>(b) || (static_cast<CNetAddr>(a) == static_cast<CNetAddr>(b) && a.port < b.port);
|
|
}
|
|
|
|
bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const
|
|
{
|
|
if (IsIPv4()) {
|
|
if (*addrlen < (socklen_t)sizeof(struct sockaddr_in))
|
|
return false;
|
|
*addrlen = sizeof(struct sockaddr_in);
|
|
struct sockaddr_in *paddrin = (struct sockaddr_in*)paddr;
|
|
memset(paddrin, 0, *addrlen);
|
|
if (!GetInAddr(&paddrin->sin_addr))
|
|
return false;
|
|
paddrin->sin_family = AF_INET;
|
|
paddrin->sin_port = htons(port);
|
|
return true;
|
|
}
|
|
if (IsIPv6()) {
|
|
if (*addrlen < (socklen_t)sizeof(struct sockaddr_in6))
|
|
return false;
|
|
*addrlen = sizeof(struct sockaddr_in6);
|
|
struct sockaddr_in6 *paddrin6 = (struct sockaddr_in6*)paddr;
|
|
memset(paddrin6, 0, *addrlen);
|
|
if (!GetIn6Addr(&paddrin6->sin6_addr))
|
|
return false;
|
|
paddrin6->sin6_scope_id = scopeId;
|
|
paddrin6->sin6_family = AF_INET6;
|
|
paddrin6->sin6_port = htons(port);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
std::vector<unsigned char> CService::GetKey() const
|
|
{
|
|
std::vector<unsigned char> vKey;
|
|
vKey.resize(18);
|
|
memcpy(vKey.data(), ip, 16);
|
|
vKey[16] = port / 0x100;
|
|
vKey[17] = port & 0x0FF;
|
|
return vKey;
|
|
}
|
|
|
|
std::string CService::ToStringPort() const
|
|
{
|
|
return strprintf("%u", port);
|
|
}
|
|
|
|
std::string CService::ToStringIPPort() const
|
|
{
|
|
if (IsIPv4() || IsTor() || IsInternal()) {
|
|
return ToStringIP() + ":" + ToStringPort();
|
|
} else {
|
|
return "[" + ToStringIP() + "]:" + ToStringPort();
|
|
}
|
|
}
|
|
|
|
std::string CService::ToString() const
|
|
{
|
|
return ToStringIPPort();
|
|
}
|
|
|
|
CSubNet::CSubNet():
|
|
valid(false)
|
|
{
|
|
memset(netmask, 0, sizeof(netmask));
|
|
}
|
|
|
|
CSubNet::CSubNet(const CNetAddr &addr, int32_t mask)
|
|
{
|
|
valid = true;
|
|
network = addr;
|
|
// Default to /32 (IPv4) or /128 (IPv6), i.e. match single address
|
|
memset(netmask, 255, sizeof(netmask));
|
|
|
|
// IPv4 addresses start at offset 12, and first 12 bytes must match, so just offset n
|
|
const int astartofs = network.IsIPv4() ? 12 : 0;
|
|
|
|
int32_t n = mask;
|
|
if(n >= 0 && n <= (128 - astartofs*8)) // Only valid if in range of bits of address
|
|
{
|
|
n += astartofs*8;
|
|
// Clear bits [n..127]
|
|
for (; n < 128; ++n)
|
|
netmask[n>>3] &= ~(1<<(7-(n&7)));
|
|
} else
|
|
valid = false;
|
|
|
|
// Normalize network according to netmask
|
|
for(int x=0; x<16; ++x)
|
|
network.ip[x] &= netmask[x];
|
|
}
|
|
|
|
CSubNet::CSubNet(const CNetAddr &addr, const CNetAddr &mask)
|
|
{
|
|
valid = true;
|
|
network = addr;
|
|
// Default to /32 (IPv4) or /128 (IPv6), i.e. match single address
|
|
memset(netmask, 255, sizeof(netmask));
|
|
|
|
// IPv4 addresses start at offset 12, and first 12 bytes must match, so just offset n
|
|
const int astartofs = network.IsIPv4() ? 12 : 0;
|
|
|
|
for(int x=astartofs; x<16; ++x)
|
|
netmask[x] = mask.ip[x];
|
|
|
|
// Normalize network according to netmask
|
|
for(int x=0; x<16; ++x)
|
|
network.ip[x] &= netmask[x];
|
|
}
|
|
|
|
CSubNet::CSubNet(const CNetAddr &addr):
|
|
valid(addr.IsValid())
|
|
{
|
|
memset(netmask, 255, sizeof(netmask));
|
|
network = addr;
|
|
}
|
|
|
|
bool CSubNet::Match(const CNetAddr &addr) const
|
|
{
|
|
if (!valid || !addr.IsValid())
|
|
return false;
|
|
for(int x=0; x<16; ++x)
|
|
if ((addr.ip[x] & netmask[x]) != network.ip[x])
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static inline int NetmaskBits(uint8_t x)
|
|
{
|
|
switch(x) {
|
|
case 0x00: return 0;
|
|
case 0x80: return 1;
|
|
case 0xc0: return 2;
|
|
case 0xe0: return 3;
|
|
case 0xf0: return 4;
|
|
case 0xf8: return 5;
|
|
case 0xfc: return 6;
|
|
case 0xfe: return 7;
|
|
case 0xff: return 8;
|
|
default: return -1;
|
|
}
|
|
}
|
|
|
|
std::string CSubNet::ToString() const
|
|
{
|
|
/* Parse binary 1{n}0{N-n} to see if mask can be represented as /n */
|
|
int cidr = 0;
|
|
bool valid_cidr = true;
|
|
int n = network.IsIPv4() ? 12 : 0;
|
|
for (; n < 16 && netmask[n] == 0xff; ++n)
|
|
cidr += 8;
|
|
if (n < 16) {
|
|
int bits = NetmaskBits(netmask[n]);
|
|
if (bits < 0)
|
|
valid_cidr = false;
|
|
else
|
|
cidr += bits;
|
|
++n;
|
|
}
|
|
for (; n < 16 && valid_cidr; ++n)
|
|
if (netmask[n] != 0x00)
|
|
valid_cidr = false;
|
|
|
|
/* Format output */
|
|
std::string strNetmask;
|
|
if (valid_cidr) {
|
|
strNetmask = strprintf("%u", cidr);
|
|
} else {
|
|
if (network.IsIPv4())
|
|
strNetmask = strprintf("%u.%u.%u.%u", netmask[12], netmask[13], netmask[14], netmask[15]);
|
|
else
|
|
strNetmask = strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
|
|
netmask[0] << 8 | netmask[1], netmask[2] << 8 | netmask[3],
|
|
netmask[4] << 8 | netmask[5], netmask[6] << 8 | netmask[7],
|
|
netmask[8] << 8 | netmask[9], netmask[10] << 8 | netmask[11],
|
|
netmask[12] << 8 | netmask[13], netmask[14] << 8 | netmask[15]);
|
|
}
|
|
|
|
return network.ToString() + "/" + strNetmask;
|
|
}
|
|
|
|
bool CSubNet::IsValid() const
|
|
{
|
|
return valid;
|
|
}
|
|
|
|
bool operator==(const CSubNet& a, const CSubNet& b)
|
|
{
|
|
return a.valid == b.valid && a.network == b.network && !memcmp(a.netmask, b.netmask, 16);
|
|
}
|
|
|
|
bool operator<(const CSubNet& a, const CSubNet& b)
|
|
{
|
|
return (a.network < b.network || (a.network == b.network && memcmp(a.netmask, b.netmask, 16) < 0));
|
|
}
|