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netbase.cpp
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netbase.cpp
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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifdef HAVE_CONFIG_H
#include "bitcoin-config.h"
#endif
#include "netbase.h"
#include "hash.h"
#include "sync.h"
#include "uint256.h"
#include "util.h"
#include "utilstrencodings.h"
#ifdef HAVE_GETADDRINFO_A
#include <netdb.h>
#endif
#ifndef WIN32
#if HAVE_INET_PTON
#include <arpa/inet.h>
#endif
#include <fcntl.h>
#endif
#include <boost/algorithm/string/case_conv.hpp> // for to_lower()
#include <boost/algorithm/string/predicate.hpp> // for startswith() and endswith()
#include <boost/thread.hpp>
#if !defined(HAVE_MSG_NOSIGNAL) && !defined(MSG_NOSIGNAL)
#define MSG_NOSIGNAL 0
#endif
using namespace std;
// Settings
static proxyType proxyInfo[NET_MAX];
static CService nameProxy;
static CCriticalSection cs_proxyInfos;
int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
bool fNameLookup = false;
static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
// Need ample time for negotiation for very slow proxies such as Tor (milliseconds)
static const int SOCKS5_RECV_TIMEOUT = 20 * 1000;
enum Network ParseNetwork(std::string net) {
boost::to_lower(net);
if (net == "ipv4") return NET_IPV4;
if (net == "ipv6") return NET_IPV6;
if (net == "tor" || net == "onion") return NET_TOR;
return NET_UNROUTABLE;
}
std::string GetNetworkName(enum Network net) {
switch(net)
{
case NET_IPV4: return "ipv4";
case NET_IPV6: return "ipv6";
case NET_TOR: return "onion";
default: return "";
}
}
void SplitHostPort(std::string in, int &portOut, std::string &hostOut) {
size_t colon = in.find_last_of(':');
// if a : is found, and it either follows a [...], or no other : is in the string, treat it as port separator
bool fHaveColon = colon != in.npos;
bool fBracketed = fHaveColon && (in[0]=='[' && in[colon-1]==']'); // if there is a colon, and in[0]=='[', colon is not 0, so in[colon-1] is safe
bool fMultiColon = fHaveColon && (in.find_last_of(':',colon-1) != in.npos);
if (fHaveColon && (colon==0 || fBracketed || !fMultiColon)) {
int32_t n;
if (ParseInt32(in.substr(colon + 1), &n) && n > 0 && n < 0x10000) {
in = in.substr(0, colon);
portOut = n;
}
}
if (in.size()>0 && in[0] == '[' && in[in.size()-1] == ']')
hostOut = in.substr(1, in.size()-2);
else
hostOut = in;
}
bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
{
vIP.clear();
{
CNetAddr addr;
if (addr.SetSpecial(std::string(pszName))) {
vIP.push_back(addr);
return true;
}
}
#ifdef HAVE_GETADDRINFO_A
struct in_addr ipv4_addr;
#ifdef HAVE_INET_PTON
if (inet_pton(AF_INET, pszName, &ipv4_addr) > 0) {
vIP.push_back(CNetAddr(ipv4_addr));
return true;
}
struct in6_addr ipv6_addr;
if (inet_pton(AF_INET6, pszName, &ipv6_addr) > 0) {
vIP.push_back(CNetAddr(ipv6_addr));
return true;
}
#else
ipv4_addr.s_addr = inet_addr(pszName);
if (ipv4_addr.s_addr != INADDR_NONE) {
vIP.push_back(CNetAddr(ipv4_addr));
return true;
}
#endif
#endif
struct addrinfo aiHint;
memset(&aiHint, 0, sizeof(struct addrinfo));
aiHint.ai_socktype = SOCK_STREAM;
aiHint.ai_protocol = IPPROTO_TCP;
aiHint.ai_family = AF_UNSPEC;
#ifdef WIN32
aiHint.ai_flags = fAllowLookup ? 0 : AI_NUMERICHOST;
#else
aiHint.ai_flags = fAllowLookup ? AI_ADDRCONFIG : AI_NUMERICHOST;
#endif
struct addrinfo *aiRes = NULL;
#ifdef HAVE_GETADDRINFO_A
struct gaicb gcb, *query = &gcb;
memset(query, 0, sizeof(struct gaicb));
gcb.ar_name = pszName;
gcb.ar_request = &aiHint;
int nErr = getaddrinfo_a(GAI_NOWAIT, &query, 1, NULL);
if (nErr)
return false;
do {
// Should set the timeout limit to a resonable value to avoid
// generating unnecessary checking call during the polling loop,
// while it can still response to stop request quick enough.
// 2 seconds looks fine in our situation.
struct timespec ts = { 2, 0 };
gai_suspend(&query, 1, &ts);
boost::this_thread::interruption_point();
nErr = gai_error(query);
if (0 == nErr)
aiRes = query->ar_result;
} while (nErr == EAI_INPROGRESS);
#else
int nErr = getaddrinfo(pszName, NULL, &aiHint, &aiRes);
#endif
if (nErr)
return false;
struct addrinfo *aiTrav = aiRes;
while (aiTrav != NULL && (nMaxSolutions == 0 || vIP.size() < nMaxSolutions))
{
if (aiTrav->ai_family == AF_INET)
{
assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in));
vIP.push_back(CNetAddr(((struct sockaddr_in*)(aiTrav->ai_addr))->sin_addr));
}
if (aiTrav->ai_family == AF_INET6)
{
assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in6));
vIP.push_back(CNetAddr(((struct sockaddr_in6*)(aiTrav->ai_addr))->sin6_addr));
}
aiTrav = aiTrav->ai_next;
}
freeaddrinfo(aiRes);
return (vIP.size() > 0);
}
bool LookupHost(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
{
std::string strHost(pszName);
if (strHost.empty())
return false;
if (boost::algorithm::starts_with(strHost, "[") && boost::algorithm::ends_with(strHost, "]"))
{
strHost = strHost.substr(1, strHost.size() - 2);
}
return LookupIntern(strHost.c_str(), vIP, nMaxSolutions, fAllowLookup);
}
bool Lookup(const char *pszName, std::vector<CService>& vAddr, int portDefault, bool fAllowLookup, unsigned int nMaxSolutions)
{
if (pszName[0] == 0)
return false;
int port = portDefault;
std::string hostname = "";
SplitHostPort(std::string(pszName), port, hostname);
std::vector<CNetAddr> vIP;
bool fRet = LookupIntern(hostname.c_str(), vIP, nMaxSolutions, fAllowLookup);
if (!fRet)
return false;
vAddr.resize(vIP.size());
for (unsigned int i = 0; i < vIP.size(); i++)
vAddr[i] = CService(vIP[i], port);
return true;
}
bool Lookup(const char *pszName, CService& addr, int portDefault, bool fAllowLookup)
{
std::vector<CService> vService;
bool fRet = Lookup(pszName, vService, portDefault, fAllowLookup, 1);
if (!fRet)
return false;
addr = vService[0];
return true;
}
bool LookupNumeric(const char *pszName, CService& addr, int portDefault)
{
return Lookup(pszName, addr, portDefault, false);
}
/**
* Convert milliseconds to a struct timeval for select.
*/
struct timeval static MillisToTimeval(int64_t nTimeout)
{
struct timeval timeout;
timeout.tv_sec = nTimeout / 1000;
timeout.tv_usec = (nTimeout % 1000) * 1000;
return timeout;
}
/**
* Read bytes from socket. This will either read the full number of bytes requested
* or return False on error or timeout.
* This function can be interrupted by boost thread interrupt.
*
* @param data Buffer to receive into
* @param len Length of data to receive
* @param timeout Timeout in milliseconds for receive operation
*
* @note This function requires that hSocket is in non-blocking mode.
*/
bool static InterruptibleRecv(char* data, size_t len, int timeout, SOCKET& hSocket)
{
int64_t curTime = GetTimeMillis();
int64_t endTime = curTime + timeout;
// Maximum time to wait in one select call. It will take up until this time (in millis)
// to break off in case of an interruption.
const int64_t maxWait = 1000;
while (len > 0 && curTime < endTime) {
ssize_t ret = recv(hSocket, data, len, 0); // Optimistically try the recv first
if (ret > 0) {
len -= ret;
data += ret;
} else if (ret == 0) { // Unexpected disconnection
return false;
} else { // Other error or blocking
int nErr = WSAGetLastError();
if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL) {
struct timeval tval = MillisToTimeval(std::min(endTime - curTime, maxWait));
fd_set fdset;
FD_ZERO(&fdset);
FD_SET(hSocket, &fdset);
int nRet = select(hSocket + 1, &fdset, NULL, NULL, &tval);
if (nRet == SOCKET_ERROR) {
return false;
}
} else {
return false;
}
}
boost::this_thread::interruption_point();
curTime = GetTimeMillis();
}
return len == 0;
}
bool static Socks5(string strDest, int port, SOCKET& hSocket)
{
LogPrintf("SOCKS5 connecting %s\n", strDest);
if (strDest.size() > 255)
{
CloseSocket(hSocket);
return error("Hostname too long");
}
char pszSocks5Init[] = "\5\1\0";
ssize_t nSize = sizeof(pszSocks5Init) - 1;
ssize_t ret = send(hSocket, pszSocks5Init, nSize, MSG_NOSIGNAL);
if (ret != nSize)
{
CloseSocket(hSocket);
return error("Error sending to proxy");
}
char pchRet1[2];
if (!InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket))
{
CloseSocket(hSocket);
return error("Error reading proxy response");
}
if (pchRet1[0] != 0x05 || pchRet1[1] != 0x00)
{
CloseSocket(hSocket);
return error("Proxy failed to initialize");
}
string strSocks5("\5\1");
strSocks5 += '\000'; strSocks5 += '\003';
strSocks5 += static_cast<char>(std::min((int)strDest.size(), 255));
strSocks5 += strDest;
strSocks5 += static_cast<char>((port >> 8) & 0xFF);
strSocks5 += static_cast<char>((port >> 0) & 0xFF);
ret = send(hSocket, strSocks5.data(), strSocks5.size(), MSG_NOSIGNAL);
if (ret != (ssize_t)strSocks5.size())
{
CloseSocket(hSocket);
return error("Error sending to proxy");
}
char pchRet2[4];
if (!InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket))
{
CloseSocket(hSocket);
return error("Error reading proxy response");
}
if (pchRet2[0] != 0x05)
{
CloseSocket(hSocket);
return error("Proxy failed to accept request");
}
if (pchRet2[1] != 0x00)
{
CloseSocket(hSocket);
switch (pchRet2[1])
{
case 0x01: return error("Proxy error: general failure");
case 0x02: return error("Proxy error: connection not allowed");
case 0x03: return error("Proxy error: network unreachable");
case 0x04: return error("Proxy error: host unreachable");
case 0x05: return error("Proxy error: connection refused");
case 0x06: return error("Proxy error: TTL expired");
case 0x07: return error("Proxy error: protocol error");
case 0x08: return error("Proxy error: address type not supported");
default: return error("Proxy error: unknown");
}
}
if (pchRet2[2] != 0x00)
{
CloseSocket(hSocket);
return error("Error: malformed proxy response");
}
char pchRet3[256];
switch (pchRet2[3])
{
case 0x01: ret = InterruptibleRecv(pchRet3, 4, SOCKS5_RECV_TIMEOUT, hSocket); break;
case 0x04: ret = InterruptibleRecv(pchRet3, 16, SOCKS5_RECV_TIMEOUT, hSocket); break;
case 0x03:
{
ret = InterruptibleRecv(pchRet3, 1, SOCKS5_RECV_TIMEOUT, hSocket);
if (!ret) {
CloseSocket(hSocket);
return error("Error reading from proxy");
}
int nRecv = pchRet3[0];
ret = InterruptibleRecv(pchRet3, nRecv, SOCKS5_RECV_TIMEOUT, hSocket);
break;
}
default: CloseSocket(hSocket); return error("Error: malformed proxy response");
}
if (!ret)
{
CloseSocket(hSocket);
return error("Error reading from proxy");
}
if (!InterruptibleRecv(pchRet3, 2, SOCKS5_RECV_TIMEOUT, hSocket))
{
CloseSocket(hSocket);
return error("Error reading from proxy");
}
LogPrintf("SOCKS5 connected %s\n", strDest);
return true;
}
bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRet, int nTimeout)
{
hSocketRet = INVALID_SOCKET;
struct sockaddr_storage sockaddr;
socklen_t len = sizeof(sockaddr);
if (!addrConnect.GetSockAddr((struct sockaddr*)&sockaddr, &len)) {
LogPrintf("Cannot connect to %s: unsupported network\n", addrConnect.ToString());
return false;
}
SOCKET hSocket = socket(((struct sockaddr*)&sockaddr)->sa_family, SOCK_STREAM, IPPROTO_TCP);
if (hSocket == INVALID_SOCKET)
return false;
#ifdef SO_NOSIGPIPE
int set = 1;
// Different way of disabling SIGPIPE on BSD
setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
#endif
// Set to non-blocking
if (!SetSocketNonBlocking(hSocket, true))
return error("ConnectSocketDirectly: Setting socket to non-blocking failed, error %s\n", NetworkErrorString(WSAGetLastError()));
if (connect(hSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR)
{
int nErr = WSAGetLastError();
// WSAEINVAL is here because some legacy version of winsock uses it
if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL)
{
struct timeval timeout = MillisToTimeval(nTimeout);
fd_set fdset;
FD_ZERO(&fdset);
FD_SET(hSocket, &fdset);
int nRet = select(hSocket + 1, NULL, &fdset, NULL, &timeout);
if (nRet == 0)
{
LogPrint("net", "connection to %s timeout\n", addrConnect.ToString());
CloseSocket(hSocket);
return false;
}
if (nRet == SOCKET_ERROR)
{
LogPrintf("select() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
CloseSocket(hSocket);
return false;
}
socklen_t nRetSize = sizeof(nRet);
#ifdef WIN32
if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, (char*)(&nRet), &nRetSize) == SOCKET_ERROR)
#else
if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, &nRet, &nRetSize) == SOCKET_ERROR)
#endif
{
LogPrintf("getsockopt() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
CloseSocket(hSocket);
return false;
}
if (nRet != 0)
{
LogPrintf("connect() to %s failed after select(): %s\n", addrConnect.ToString(), NetworkErrorString(nRet));
CloseSocket(hSocket);
return false;
}
}
#ifdef WIN32
else if (WSAGetLastError() != WSAEISCONN)
#else
else
#endif
{
LogPrintf("connect() to %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
CloseSocket(hSocket);
return false;
}
}
hSocketRet = hSocket;
return true;
}
bool SetProxy(enum Network net, CService addrProxy) {
assert(net >= 0 && net < NET_MAX);
if (!addrProxy.IsValid())
return false;
LOCK(cs_proxyInfos);
proxyInfo[net] = addrProxy;
return true;
}
bool GetProxy(enum Network net, proxyType &proxyInfoOut) {
assert(net >= 0 && net < NET_MAX);
LOCK(cs_proxyInfos);
if (!proxyInfo[net].IsValid())
return false;
proxyInfoOut = proxyInfo[net];
return true;
}
bool SetNameProxy(CService addrProxy) {
if (!addrProxy.IsValid())
return false;
LOCK(cs_proxyInfos);
nameProxy = addrProxy;
return true;
}
bool GetNameProxy(CService &nameProxyOut) {
LOCK(cs_proxyInfos);
if(!nameProxy.IsValid())
return false;
nameProxyOut = nameProxy;
return true;
}
bool HaveNameProxy() {
LOCK(cs_proxyInfos);
return nameProxy.IsValid();
}
bool IsProxy(const CNetAddr &addr) {
LOCK(cs_proxyInfos);
for (int i = 0; i < NET_MAX; i++) {
if (addr == (CNetAddr)proxyInfo[i])
return true;
}
return false;
}
bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout)
{
proxyType proxy;
// no proxy needed (none set for target network)
if (!GetProxy(addrDest.GetNetwork(), proxy))
return ConnectSocketDirectly(addrDest, hSocketRet, nTimeout);
SOCKET hSocket = INVALID_SOCKET;
// first connect to proxy server
if (!ConnectSocketDirectly(proxy, hSocket, nTimeout))
return false;
// do socks negotiation
if (!Socks5(addrDest.ToStringIP(), addrDest.GetPort(), hSocket))
return false;
hSocketRet = hSocket;
return true;
}
bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest, int portDefault, int nTimeout)
{
string strDest;
int port = portDefault;
SplitHostPort(string(pszDest), port, strDest);
SOCKET hSocket = INVALID_SOCKET;
CService nameProxy;
GetNameProxy(nameProxy);
CService addrResolved(CNetAddr(strDest, fNameLookup && !HaveNameProxy()), port);
if (addrResolved.IsValid()) {
addr = addrResolved;
return ConnectSocket(addr, hSocketRet, nTimeout);
}
addr = CService("0.0.0.0:0");
if (!HaveNameProxy())
return false;
// first connect to name proxy server
if (!ConnectSocketDirectly(nameProxy, hSocket, nTimeout))
return false;
// do socks negotiation
if (!Socks5(strDest, (unsigned short)port, hSocket))
return false;
hSocketRet = hSocket;
return true;
}
void CNetAddr::Init()
{
memset(ip, 0, sizeof(ip));
}
void CNetAddr::SetIP(const CNetAddr& ipIn)
{
memcpy(ip, ipIn.ip, sizeof(ip));
}
void CNetAddr::SetRaw(Network network, const uint8_t *ip_in)
{
switch(network)
{
case NET_IPV4:
memcpy(ip, pchIPv4, 12);
memcpy(ip+12, ip_in, 4);
break;
case NET_IPV6:
memcpy(ip, ip_in, 16);
break;
default:
assert(!"invalid network");
}
}
static const unsigned char pchOnionCat[] = {0xFD,0x87,0xD8,0x7E,0xEB,0x43};
bool CNetAddr::SetSpecial(const std::string &strName)
{
if (strName.size()>6 && strName.substr(strName.size() - 6, 6) == ".onion") {
std::vector<unsigned char> vchAddr = DecodeBase32(strName.substr(0, strName.size() - 6).c_str());
if (vchAddr.size() != 16-sizeof(pchOnionCat))
return false;
memcpy(ip, pchOnionCat, sizeof(pchOnionCat));
for (unsigned int i=0; i<16-sizeof(pchOnionCat); i++)
ip[i + sizeof(pchOnionCat)] = vchAddr[i];
return true;
}
return false;
}
CNetAddr::CNetAddr()
{
Init();
}
CNetAddr::CNetAddr(const struct in_addr& ipv4Addr)
{
SetRaw(NET_IPV4, (const uint8_t*)&ipv4Addr);
}
CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr)
{
SetRaw(NET_IPV6, (const uint8_t*)&ipv6Addr);
}
CNetAddr::CNetAddr(const char *pszIp, bool fAllowLookup)
{
Init();
std::vector<CNetAddr> vIP;
if (LookupHost(pszIp, vIP, 1, fAllowLookup))
*this = vIP[0];
}
CNetAddr::CNetAddr(const std::string &strIp, bool fAllowLookup)
{
Init();
std::vector<CNetAddr> vIP;
if (LookupHost(strIp.c_str(), vIP, 1, fAllowLookup))
*this = vIP[0];
}
unsigned int CNetAddr::GetByte(int n) const
{
return ip[15-n];
}
bool CNetAddr::IsIPv4() const
{
return (memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0);
}
bool CNetAddr::IsIPv6() const
{
return (!IsIPv4() && !IsTor());
}
bool CNetAddr::IsRFC1918() const
{
return IsIPv4() && (
GetByte(3) == 10 ||
(GetByte(3) == 192 && GetByte(2) == 168) ||
(GetByte(3) == 172 && (GetByte(2) >= 16 && GetByte(2) <= 31)));
}
bool CNetAddr::IsRFC3927() const
{
return IsIPv4() && (GetByte(3) == 169 && GetByte(2) == 254);
}
bool CNetAddr::IsRFC3849() const
{
return GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x0D && GetByte(12) == 0xB8;
}
bool CNetAddr::IsRFC3964() const
{
return (GetByte(15) == 0x20 && GetByte(14) == 0x02);
}
bool CNetAddr::IsRFC6052() const
{
static const unsigned char pchRFC6052[] = {0,0x64,0xFF,0x9B,0,0,0,0,0,0,0,0};
return (memcmp(ip, pchRFC6052, sizeof(pchRFC6052)) == 0);
}
bool CNetAddr::IsRFC4380() const
{
return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0 && GetByte(12) == 0);
}
bool CNetAddr::IsRFC4862() const
{
static const unsigned char pchRFC4862[] = {0xFE,0x80,0,0,0,0,0,0};
return (memcmp(ip, pchRFC4862, sizeof(pchRFC4862)) == 0);
}
bool CNetAddr::IsRFC4193() const
{
return ((GetByte(15) & 0xFE) == 0xFC);
}
bool CNetAddr::IsRFC6145() const
{
static const unsigned char pchRFC6145[] = {0,0,0,0,0,0,0,0,0xFF,0xFF,0,0};
return (memcmp(ip, pchRFC6145, sizeof(pchRFC6145)) == 0);
}
bool CNetAddr::IsRFC4843() const
{
return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10);
}
bool CNetAddr::IsTor() const
{
return (memcmp(ip, pchOnionCat, sizeof(pchOnionCat)) == 0);
}
bool CNetAddr::IsLocal() const
{
// IPv4 loopback
if (IsIPv4() && (GetByte(3) == 127 || GetByte(3) == 0))
return true;
// IPv6 loopback (::1/128)
static const unsigned char pchLocal[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
if (memcmp(ip, pchLocal, 16) == 0)
return true;
return false;
}
bool CNetAddr::IsMulticast() const
{
return (IsIPv4() && (GetByte(3) & 0xF0) == 0xE0)
|| (GetByte(15) == 0xFF);
}
bool CNetAddr::IsValid() const
{
// Cleanup 3-byte shifted addresses caused by garbage in size field
// of addr messages from versions before 0.2.9 checksum.
// Two consecutive addr messages look like this:
// header20 vectorlen3 addr26 addr26 addr26 header20 vectorlen3 addr26 addr26 addr26...
// so if the first length field is garbled, it reads the second batch
// of addr misaligned by 3 bytes.
if (memcmp(ip, pchIPv4+3, sizeof(pchIPv4)-3) == 0)
return false;
// unspecified IPv6 address (::/128)
unsigned char ipNone[16] = {};
if (memcmp(ip, ipNone, 16) == 0)
return false;
// documentation IPv6 address
if (IsRFC3849())
return false;
if (IsIPv4())
{
// INADDR_NONE
uint32_t ipNone = INADDR_NONE;
if (memcmp(ip+12, &ipNone, 4) == 0)
return false;
// 0
ipNone = 0;
if (memcmp(ip+12, &ipNone, 4) == 0)
return false;
}
return true;
}
bool CNetAddr::IsRoutable() const
{
return IsValid() && !(IsRFC1918() || IsRFC3927() || IsRFC4862() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsLocal());
}
enum Network CNetAddr::GetNetwork() const
{
if (!IsRoutable())
return NET_UNROUTABLE;
if (IsIPv4())
return NET_IPV4;
if (IsTor())
return NET_TOR;
return NET_IPV6;
}
std::string CNetAddr::ToStringIP() const
{
if (IsTor())
return EncodeBase32(&ip[6], 10) + ".onion";
CService serv(*this, 0);
struct sockaddr_storage sockaddr;
socklen_t socklen = sizeof(sockaddr);
if (serv.GetSockAddr((struct sockaddr*)&sockaddr, &socklen)) {
char name[1025] = "";
if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), NULL, 0, NI_NUMERICHOST))
return std::string(name);
}
if (IsIPv4())
return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));
else
return strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
GetByte(15) << 8 | GetByte(14), GetByte(13) << 8 | GetByte(12),
GetByte(11) << 8 | GetByte(10), GetByte(9) << 8 | GetByte(8),
GetByte(7) << 8 | GetByte(6), GetByte(5) << 8 | GetByte(4),
GetByte(3) << 8 | GetByte(2), GetByte(1) << 8 | GetByte(0));
}
std::string CNetAddr::ToString() const
{
return ToStringIP();
}
bool operator==(const CNetAddr& a, const CNetAddr& b)
{
return (memcmp(a.ip, b.ip, 16) == 0);
}
bool operator!=(const CNetAddr& a, const CNetAddr& b)
{
return (memcmp(a.ip, b.ip, 16) != 0);
}
bool operator<(const CNetAddr& a, const CNetAddr& b)
{
return (memcmp(a.ip, b.ip, 16) < 0);
}
bool CNetAddr::GetInAddr(struct in_addr* pipv4Addr) const
{
if (!IsIPv4())
return false;
memcpy(pipv4Addr, ip+12, 4);
return true;
}
bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const
{
memcpy(pipv6Addr, ip, 16);
return true;
}
// get canonical identifier of an address' group
// no two connections will be attempted to addresses with the same group
std::vector<unsigned char> CNetAddr::GetGroup() const
{
std::vector<unsigned char> vchRet;
int nClass = NET_IPV6;
int nStartByte = 0;
int nBits = 16;
// all local addresses belong to the same group
if (IsLocal())
{
nClass = 255;
nBits = 0;
}
// all unroutable addresses belong to the same group
if (!IsRoutable())
{
nClass = NET_UNROUTABLE;
nBits = 0;
}
// for IPv4 addresses, '1' + the 16 higher-order bits of the IP
// includes mapped IPv4, SIIT translated IPv4, and the well-known prefix
else if (IsIPv4() || IsRFC6145() || IsRFC6052())
{
nClass = NET_IPV4;
nStartByte = 12;
}
// for 6to4 tunnelled addresses, use the encapsulated IPv4 address
else if (IsRFC3964())
{
nClass = NET_IPV4;
nStartByte = 2;
}
// for Teredo-tunnelled IPv6 addresses, use the encapsulated IPv4 address
else if (IsRFC4380())
{
vchRet.push_back(NET_IPV4);
vchRet.push_back(GetByte(3) ^ 0xFF);
vchRet.push_back(GetByte(2) ^ 0xFF);
return vchRet;
}
else if (IsTor())
{
nClass = NET_TOR;
nStartByte = 6;
nBits = 4;
}
// for he.net, use /36 groups
else if (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x04 && GetByte(12) == 0x70)
nBits = 36;
// for the rest of the IPv6 network, use /32 groups
else
nBits = 32;
vchRet.push_back(nClass);
while (nBits >= 8)
{
vchRet.push_back(GetByte(15 - nStartByte));
nStartByte++;
nBits -= 8;
}
if (nBits > 0)
vchRet.push_back(GetByte(15 - nStartByte) | ((1 << nBits) - 1));
return vchRet;
}
uint64_t CNetAddr::GetHash() const
{
uint256 hash = Hash(&ip[0], &ip[16]);
uint64_t nRet;
memcpy(&nRet, &hash, sizeof(nRet));
return nRet;
}
// private extensions to enum Network, only returned by GetExtNetwork,
// and only used in GetReachabilityFrom
static const int NET_UNKNOWN = NET_MAX + 0;
static const int NET_TEREDO = NET_MAX + 1;
int static GetExtNetwork(const CNetAddr *addr)
{
if (addr == NULL)
return NET_UNKNOWN;
if (addr->IsRFC4380())
return NET_TEREDO;
return addr->GetNetwork();
}
/** Calculates a metric for how reachable (*this) is from a given partner */
int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const
{
enum Reachability {
REACH_UNREACHABLE,
REACH_DEFAULT,
REACH_TEREDO,
REACH_IPV6_WEAK,
REACH_IPV4,
REACH_IPV6_STRONG,
REACH_PRIVATE
};
if (!IsRoutable())
return REACH_UNREACHABLE;
int ourNet = GetExtNetwork(this);
int theirNet = GetExtNetwork(paddrPartner);
bool fTunnel = IsRFC3964() || IsRFC6052() || IsRFC6145();
switch(theirNet) {
case NET_IPV4:
switch(ourNet) {
default: return REACH_DEFAULT;
case NET_IPV4: return REACH_IPV4;
}
case NET_IPV6:
switch(ourNet) {
default: return REACH_DEFAULT;
case NET_TEREDO: return REACH_TEREDO;
case NET_IPV4: return REACH_IPV4;
case NET_IPV6: return fTunnel ? REACH_IPV6_WEAK : REACH_IPV6_STRONG; // only prefer giving our IPv6 address if it's not tunnelled
}
case NET_TOR:
switch(ourNet) {
default: return REACH_DEFAULT;
case NET_IPV4: return REACH_IPV4; // Tor users can connect to IPv4 as well
case NET_TOR: return REACH_PRIVATE;
}
case NET_TEREDO:
switch(ourNet) {
default: return REACH_DEFAULT;
case NET_TEREDO: return REACH_TEREDO;
case NET_IPV6: return REACH_IPV6_WEAK;
case NET_IPV4: return REACH_IPV4;
}
case NET_UNKNOWN:
case NET_UNROUTABLE:
default:
switch(ourNet) {
default: return REACH_DEFAULT;
case NET_TEREDO: return REACH_TEREDO;
case NET_IPV6: return REACH_IPV6_WEAK;
case NET_IPV4: return REACH_IPV4;
case NET_TOR: return REACH_PRIVATE; // either from Tor, or don't care about our address
}
}