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717 lines
19 KiB
C++
717 lines
19 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2015 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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#ifdef HAVE_CONFIG_H
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#include "config/bitcoin-config.h"
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#endif
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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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void CNetAddr::Init()
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{
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memset(ip, 0, sizeof(ip));
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scopeId = 0;
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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::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()
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{
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Init();
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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());
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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::IsMulticast() const
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{
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return (IsIPv4() && (GetByte(3) & 0xF0) == 0xE0)
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|| (GetByte(15) == 0xFF);
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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 (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());
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}
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enum Network CNetAddr::GetNetwork() const
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{
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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_TOR;
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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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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), NULL, 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 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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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 unroutable addresses belong to the same group
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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_TOR;
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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 == NULL)
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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())
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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_TOR:
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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_TOR: 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_TOR: 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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void CService::Init()
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{
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port = 0;
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}
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CService::CService()
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{
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Init();
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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)
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{
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switch (paddr->sa_family) {
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case AF_INET:
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*this = CService(*(const struct sockaddr_in*)paddr);
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return true;
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case AF_INET6:
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*this = CService(*(const struct sockaddr_in6*)paddr);
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return true;
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default:
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return false;
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}
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}
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unsigned short CService::GetPort() const
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{
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return port;
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}
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bool operator==(const CService& a, const CService& b)
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{
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return (CNetAddr)a == (CNetAddr)b && a.port == b.port;
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}
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bool operator!=(const CService& a, const CService& b)
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{
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return (CNetAddr)a != (CNetAddr)b || a.port != b.port;
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|
}
|
|
|
|
bool operator<(const CService& a, const CService& b)
|
|
{
|
|
return (CNetAddr)a < (CNetAddr)b || ((CNetAddr)a == (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[0], 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()) {
|
|
return ToStringIP() + ":" + ToStringPort();
|
|
} else {
|
|
return "[" + ToStringIP() + "]:" + ToStringPort();
|
|
}
|
|
}
|
|
|
|
std::string CService::ToString() const
|
|
{
|
|
return ToStringIPPort();
|
|
}
|
|
|
|
void CService::SetPort(unsigned short portIn)
|
|
{
|
|
port = portIn;
|
|
}
|
|
|
|
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; break;
|
|
case 0x80: return 1; break;
|
|
case 0xc0: return 2; break;
|
|
case 0xe0: return 3; break;
|
|
case 0xf0: return 4; break;
|
|
case 0xf8: return 5; break;
|
|
case 0xfc: return 6; break;
|
|
case 0xfe: return 7; break;
|
|
case 0xff: return 8; break;
|
|
default: return -1; break;
|
|
}
|
|
}
|
|
|
|
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==b);
|
|
}
|
|
|
|
bool operator<(const CSubNet& a, const CSubNet& b)
|
|
{
|
|
return (a.network < b.network || (a.network == b.network && memcmp(a.netmask, b.netmask, 16) < 0));
|
|
}
|