1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2014 The Bitcoin Core developers
3 // Distributed under the MIT software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
7 #include "config/bitcoin-config.h"
17 #include "utilstrencodings.h"
19 #ifdef HAVE_GETADDRINFO_A
25 #include <arpa/inet.h>
30 #include <boost/algorithm/string/case_conv.hpp> // for to_lower()
31 #include <boost/algorithm/string/predicate.hpp> // for startswith() and endswith()
32 #include <boost/thread.hpp>
34 #if !defined(HAVE_MSG_NOSIGNAL) && !defined(MSG_NOSIGNAL)
35 #define MSG_NOSIGNAL 0
39 static proxyType proxyInfo[NET_MAX];
40 static proxyType nameProxy;
41 static CCriticalSection cs_proxyInfos;
42 int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
43 bool fNameLookup = false;
45 static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
47 // Need ample time for negotiation for very slow proxies such as Tor (milliseconds)
48 static const int SOCKS5_RECV_TIMEOUT = 20 * 1000;
50 enum Network ParseNetwork(std::string net) {
52 if (net == "ipv4") return NET_IPV4;
53 if (net == "ipv6") return NET_IPV6;
54 if (net == "tor" || net == "onion") return NET_TOR;
55 return NET_UNROUTABLE;
58 std::string GetNetworkName(enum Network net) {
61 case NET_IPV4: return "ipv4";
62 case NET_IPV6: return "ipv6";
63 case NET_TOR: return "onion";
68 void SplitHostPort(std::string in, int &portOut, std::string &hostOut) {
69 size_t colon = in.find_last_of(':');
70 // if a : is found, and it either follows a [...], or no other : is in the string, treat it as port separator
71 bool fHaveColon = colon != in.npos;
72 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
73 bool fMultiColon = fHaveColon && (in.find_last_of(':',colon-1) != in.npos);
74 if (fHaveColon && (colon==0 || fBracketed || !fMultiColon)) {
76 if (ParseInt32(in.substr(colon + 1), &n) && n > 0 && n < 0x10000) {
77 in = in.substr(0, colon);
81 if (in.size()>0 && in[0] == '[' && in[in.size()-1] == ']')
82 hostOut = in.substr(1, in.size()-2);
87 bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
93 if (addr.SetSpecial(std::string(pszName))) {
99 #ifdef HAVE_GETADDRINFO_A
100 struct in_addr ipv4_addr;
101 #ifdef HAVE_INET_PTON
102 if (inet_pton(AF_INET, pszName, &ipv4_addr) > 0) {
103 vIP.push_back(CNetAddr(ipv4_addr));
107 struct in6_addr ipv6_addr;
108 if (inet_pton(AF_INET6, pszName, &ipv6_addr) > 0) {
109 vIP.push_back(CNetAddr(ipv6_addr));
113 ipv4_addr.s_addr = inet_addr(pszName);
114 if (ipv4_addr.s_addr != INADDR_NONE) {
115 vIP.push_back(CNetAddr(ipv4_addr));
121 struct addrinfo aiHint;
122 memset(&aiHint, 0, sizeof(struct addrinfo));
123 aiHint.ai_socktype = SOCK_STREAM;
124 aiHint.ai_protocol = IPPROTO_TCP;
125 aiHint.ai_family = AF_UNSPEC;
127 aiHint.ai_flags = fAllowLookup ? 0 : AI_NUMERICHOST;
129 aiHint.ai_flags = fAllowLookup ? AI_ADDRCONFIG : AI_NUMERICHOST;
132 struct addrinfo *aiRes = NULL;
133 #ifdef HAVE_GETADDRINFO_A
134 struct gaicb gcb, *query = &gcb;
135 memset(query, 0, sizeof(struct gaicb));
136 gcb.ar_name = pszName;
137 gcb.ar_request = &aiHint;
138 int nErr = getaddrinfo_a(GAI_NOWAIT, &query, 1, NULL);
143 // Should set the timeout limit to a resonable value to avoid
144 // generating unnecessary checking call during the polling loop,
145 // while it can still response to stop request quick enough.
146 // 2 seconds looks fine in our situation.
147 struct timespec ts = { 2, 0 };
148 gai_suspend(&query, 1, &ts);
149 boost::this_thread::interruption_point();
151 nErr = gai_error(query);
153 aiRes = query->ar_result;
154 } while (nErr == EAI_INPROGRESS);
156 int nErr = getaddrinfo(pszName, NULL, &aiHint, &aiRes);
161 struct addrinfo *aiTrav = aiRes;
162 while (aiTrav != NULL && (nMaxSolutions == 0 || vIP.size() < nMaxSolutions))
164 if (aiTrav->ai_family == AF_INET)
166 assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in));
167 vIP.push_back(CNetAddr(((struct sockaddr_in*)(aiTrav->ai_addr))->sin_addr));
170 if (aiTrav->ai_family == AF_INET6)
172 assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in6));
173 vIP.push_back(CNetAddr(((struct sockaddr_in6*)(aiTrav->ai_addr))->sin6_addr));
176 aiTrav = aiTrav->ai_next;
181 return (vIP.size() > 0);
184 bool LookupHost(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
186 std::string strHost(pszName);
189 if (boost::algorithm::starts_with(strHost, "[") && boost::algorithm::ends_with(strHost, "]"))
191 strHost = strHost.substr(1, strHost.size() - 2);
194 return LookupIntern(strHost.c_str(), vIP, nMaxSolutions, fAllowLookup);
197 bool Lookup(const char *pszName, std::vector<CService>& vAddr, int portDefault, bool fAllowLookup, unsigned int nMaxSolutions)
201 int port = portDefault;
202 std::string hostname = "";
203 SplitHostPort(std::string(pszName), port, hostname);
205 std::vector<CNetAddr> vIP;
206 bool fRet = LookupIntern(hostname.c_str(), vIP, nMaxSolutions, fAllowLookup);
209 vAddr.resize(vIP.size());
210 for (unsigned int i = 0; i < vIP.size(); i++)
211 vAddr[i] = CService(vIP[i], port);
215 bool Lookup(const char *pszName, CService& addr, int portDefault, bool fAllowLookup)
217 std::vector<CService> vService;
218 bool fRet = Lookup(pszName, vService, portDefault, fAllowLookup, 1);
225 bool LookupNumeric(const char *pszName, CService& addr, int portDefault)
227 return Lookup(pszName, addr, portDefault, false);
231 * Convert milliseconds to a struct timeval for select.
233 struct timeval static MillisToTimeval(int64_t nTimeout)
235 struct timeval timeout;
236 timeout.tv_sec = nTimeout / 1000;
237 timeout.tv_usec = (nTimeout % 1000) * 1000;
242 * Read bytes from socket. This will either read the full number of bytes requested
243 * or return False on error or timeout.
244 * This function can be interrupted by boost thread interrupt.
246 * @param data Buffer to receive into
247 * @param len Length of data to receive
248 * @param timeout Timeout in milliseconds for receive operation
250 * @note This function requires that hSocket is in non-blocking mode.
252 bool static InterruptibleRecv(char* data, size_t len, int timeout, SOCKET& hSocket)
254 int64_t curTime = GetTimeMillis();
255 int64_t endTime = curTime + timeout;
256 // Maximum time to wait in one select call. It will take up until this time (in millis)
257 // to break off in case of an interruption.
258 const int64_t maxWait = 1000;
259 while (len > 0 && curTime < endTime) {
260 ssize_t ret = recv(hSocket, data, len, 0); // Optimistically try the recv first
264 } else if (ret == 0) { // Unexpected disconnection
266 } else { // Other error or blocking
267 int nErr = WSAGetLastError();
268 if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL) {
269 if (!IsSelectableSocket(hSocket)) {
272 struct timeval tval = MillisToTimeval(std::min(endTime - curTime, maxWait));
275 FD_SET(hSocket, &fdset);
276 int nRet = select(hSocket + 1, &fdset, NULL, NULL, &tval);
277 if (nRet == SOCKET_ERROR) {
284 boost::this_thread::interruption_point();
285 curTime = GetTimeMillis();
290 struct ProxyCredentials
292 std::string username;
293 std::string password;
296 /** Connect using SOCKS5 (as described in RFC1928) */
297 static bool Socks5(const std::string& strDest, int port, const ProxyCredentials *auth, SOCKET& hSocket)
299 LogPrintf("SOCKS5 connecting %s\n", strDest);
300 if (strDest.size() > 255) {
301 CloseSocket(hSocket);
302 return error("Hostname too long");
304 // Accepted authentication methods
305 std::vector<uint8_t> vSocks5Init;
306 vSocks5Init.push_back(0x05);
308 vSocks5Init.push_back(0x02); // # METHODS
309 vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
310 vSocks5Init.push_back(0x02); // X'02' USERNAME/PASSWORD (RFC1929)
312 vSocks5Init.push_back(0x01); // # METHODS
313 vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
315 ssize_t ret = send(hSocket, (const char*)begin_ptr(vSocks5Init), vSocks5Init.size(), MSG_NOSIGNAL);
316 if (ret != (ssize_t)vSocks5Init.size()) {
317 CloseSocket(hSocket);
318 return error("Error sending to proxy");
321 if (!InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
322 CloseSocket(hSocket);
323 return error("Error reading proxy response");
325 if (pchRet1[0] != 0x05) {
326 CloseSocket(hSocket);
327 return error("Proxy failed to initialize");
329 if (pchRet1[1] == 0x02 && auth) {
330 // Perform username/password authentication (as described in RFC1929)
331 std::vector<uint8_t> vAuth;
332 vAuth.push_back(0x01);
333 if (auth->username.size() > 255 || auth->password.size() > 255)
334 return error("Proxy username or password too long");
335 vAuth.push_back(auth->username.size());
336 vAuth.insert(vAuth.end(), auth->username.begin(), auth->username.end());
337 vAuth.push_back(auth->password.size());
338 vAuth.insert(vAuth.end(), auth->password.begin(), auth->password.end());
339 ret = send(hSocket, (const char*)begin_ptr(vAuth), vAuth.size(), MSG_NOSIGNAL);
340 if (ret != (ssize_t)vAuth.size()) {
341 CloseSocket(hSocket);
342 return error("Error sending authentication to proxy");
344 LogPrint("proxy", "SOCKS5 sending proxy authentication %s:%s\n", auth->username, auth->password);
346 if (!InterruptibleRecv(pchRetA, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
347 CloseSocket(hSocket);
348 return error("Error reading proxy authentication response");
350 if (pchRetA[0] != 0x01 || pchRetA[1] != 0x00) {
351 CloseSocket(hSocket);
352 return error("Proxy authentication unsuccessful");
354 } else if (pchRet1[1] == 0x00) {
355 // Perform no authentication
357 CloseSocket(hSocket);
358 return error("Proxy requested wrong authentication method %02x", pchRet1[1]);
360 std::vector<uint8_t> vSocks5;
361 vSocks5.push_back(0x05); // VER protocol version
362 vSocks5.push_back(0x01); // CMD CONNECT
363 vSocks5.push_back(0x00); // RSV Reserved
364 vSocks5.push_back(0x03); // ATYP DOMAINNAME
365 vSocks5.push_back(strDest.size()); // Length<=255 is checked at beginning of function
366 vSocks5.insert(vSocks5.end(), strDest.begin(), strDest.end());
367 vSocks5.push_back((port >> 8) & 0xFF);
368 vSocks5.push_back((port >> 0) & 0xFF);
369 ret = send(hSocket, (const char*)begin_ptr(vSocks5), vSocks5.size(), MSG_NOSIGNAL);
370 if (ret != (ssize_t)vSocks5.size()) {
371 CloseSocket(hSocket);
372 return error("Error sending to proxy");
375 if (!InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket)) {
376 CloseSocket(hSocket);
377 return error("Error reading proxy response");
379 if (pchRet2[0] != 0x05) {
380 CloseSocket(hSocket);
381 return error("Proxy failed to accept request");
383 if (pchRet2[1] != 0x00) {
384 CloseSocket(hSocket);
387 case 0x01: return error("Proxy error: general failure");
388 case 0x02: return error("Proxy error: connection not allowed");
389 case 0x03: return error("Proxy error: network unreachable");
390 case 0x04: return error("Proxy error: host unreachable");
391 case 0x05: return error("Proxy error: connection refused");
392 case 0x06: return error("Proxy error: TTL expired");
393 case 0x07: return error("Proxy error: protocol error");
394 case 0x08: return error("Proxy error: address type not supported");
395 default: return error("Proxy error: unknown");
398 if (pchRet2[2] != 0x00) {
399 CloseSocket(hSocket);
400 return error("Error: malformed proxy response");
405 case 0x01: ret = InterruptibleRecv(pchRet3, 4, SOCKS5_RECV_TIMEOUT, hSocket); break;
406 case 0x04: ret = InterruptibleRecv(pchRet3, 16, SOCKS5_RECV_TIMEOUT, hSocket); break;
409 ret = InterruptibleRecv(pchRet3, 1, SOCKS5_RECV_TIMEOUT, hSocket);
411 CloseSocket(hSocket);
412 return error("Error reading from proxy");
414 int nRecv = pchRet3[0];
415 ret = InterruptibleRecv(pchRet3, nRecv, SOCKS5_RECV_TIMEOUT, hSocket);
418 default: CloseSocket(hSocket); return error("Error: malformed proxy response");
421 CloseSocket(hSocket);
422 return error("Error reading from proxy");
424 if (!InterruptibleRecv(pchRet3, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
425 CloseSocket(hSocket);
426 return error("Error reading from proxy");
428 LogPrintf("SOCKS5 connected %s\n", strDest);
432 bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRet, int nTimeout)
434 hSocketRet = INVALID_SOCKET;
436 struct sockaddr_storage sockaddr;
437 socklen_t len = sizeof(sockaddr);
438 if (!addrConnect.GetSockAddr((struct sockaddr*)&sockaddr, &len)) {
439 LogPrintf("Cannot connect to %s: unsupported network\n", addrConnect.ToString());
443 SOCKET hSocket = socket(((struct sockaddr*)&sockaddr)->sa_family, SOCK_STREAM, IPPROTO_TCP);
444 if (hSocket == INVALID_SOCKET)
449 // Different way of disabling SIGPIPE on BSD
450 setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
453 //Disable Nagle's algorithm
455 setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&set, sizeof(int));
457 setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (void*)&set, sizeof(int));
460 // Set to non-blocking
461 if (!SetSocketNonBlocking(hSocket, true))
462 return error("ConnectSocketDirectly: Setting socket to non-blocking failed, error %s\n", NetworkErrorString(WSAGetLastError()));
464 if (connect(hSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR)
466 int nErr = WSAGetLastError();
467 // WSAEINVAL is here because some legacy version of winsock uses it
468 if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL)
470 struct timeval timeout = MillisToTimeval(nTimeout);
473 FD_SET(hSocket, &fdset);
474 int nRet = select(hSocket + 1, NULL, &fdset, NULL, &timeout);
477 LogPrint("net", "connection to %s timeout\n", addrConnect.ToString());
478 CloseSocket(hSocket);
481 if (nRet == SOCKET_ERROR)
483 LogPrintf("select() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
484 CloseSocket(hSocket);
487 socklen_t nRetSize = sizeof(nRet);
489 if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, (char*)(&nRet), &nRetSize) == SOCKET_ERROR)
491 if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, &nRet, &nRetSize) == SOCKET_ERROR)
494 LogPrintf("getsockopt() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
495 CloseSocket(hSocket);
500 LogPrintf("connect() to %s failed after select(): %s\n", addrConnect.ToString(), NetworkErrorString(nRet));
501 CloseSocket(hSocket);
506 else if (WSAGetLastError() != WSAEISCONN)
511 LogPrintf("connect() to %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
512 CloseSocket(hSocket);
517 hSocketRet = hSocket;
521 bool SetProxy(enum Network net, const proxyType &addrProxy) {
522 assert(net >= 0 && net < NET_MAX);
523 if (!addrProxy.IsValid())
526 proxyInfo[net] = addrProxy;
530 bool GetProxy(enum Network net, proxyType &proxyInfoOut) {
531 assert(net >= 0 && net < NET_MAX);
533 if (!proxyInfo[net].IsValid())
535 proxyInfoOut = proxyInfo[net];
539 bool SetNameProxy(const proxyType &addrProxy) {
540 if (!addrProxy.IsValid())
543 nameProxy = addrProxy;
547 bool GetNameProxy(proxyType &nameProxyOut) {
549 if(!nameProxy.IsValid())
551 nameProxyOut = nameProxy;
555 bool HaveNameProxy() {
557 return nameProxy.IsValid();
560 bool IsProxy(const CNetAddr &addr) {
562 for (int i = 0; i < NET_MAX; i++) {
563 if (addr == (CNetAddr)proxyInfo[i].proxy)
569 static bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int port, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
571 SOCKET hSocket = INVALID_SOCKET;
572 // first connect to proxy server
573 if (!ConnectSocketDirectly(proxy.proxy, hSocket, nTimeout)) {
574 if (outProxyConnectionFailed)
575 *outProxyConnectionFailed = true;
578 // do socks negotiation
579 if (proxy.randomize_credentials) {
580 ProxyCredentials random_auth;
581 random_auth.username = strprintf("%i", insecure_rand());
582 random_auth.password = strprintf("%i", insecure_rand());
583 if (!Socks5(strDest, (unsigned short)port, &random_auth, hSocket))
586 if (!Socks5(strDest, (unsigned short)port, 0, hSocket))
590 hSocketRet = hSocket;
594 bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
597 if (outProxyConnectionFailed)
598 *outProxyConnectionFailed = false;
600 if (GetProxy(addrDest.GetNetwork(), proxy))
601 return ConnectThroughProxy(proxy, addrDest.ToStringIP(), addrDest.GetPort(), hSocketRet, nTimeout, outProxyConnectionFailed);
602 else // no proxy needed (none set for target network)
603 return ConnectSocketDirectly(addrDest, hSocketRet, nTimeout);
606 bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest, int portDefault, int nTimeout, bool *outProxyConnectionFailed)
609 int port = portDefault;
611 if (outProxyConnectionFailed)
612 *outProxyConnectionFailed = false;
614 SplitHostPort(std::string(pszDest), port, strDest);
617 GetNameProxy(nameProxy);
619 CService addrResolved(CNetAddr(strDest, fNameLookup && !HaveNameProxy()), port);
620 if (addrResolved.IsValid()) {
622 return ConnectSocket(addr, hSocketRet, nTimeout);
625 addr = CService("0.0.0.0:0");
627 if (!HaveNameProxy())
629 return ConnectThroughProxy(nameProxy, strDest, port, hSocketRet, nTimeout, outProxyConnectionFailed);
632 void CNetAddr::Init()
634 memset(ip, 0, sizeof(ip));
637 void CNetAddr::SetIP(const CNetAddr& ipIn)
639 memcpy(ip, ipIn.ip, sizeof(ip));
642 void CNetAddr::SetRaw(Network network, const uint8_t *ip_in)
647 memcpy(ip, pchIPv4, 12);
648 memcpy(ip+12, ip_in, 4);
651 memcpy(ip, ip_in, 16);
654 assert(!"invalid network");
658 static const unsigned char pchOnionCat[] = {0xFD,0x87,0xD8,0x7E,0xEB,0x43};
660 bool CNetAddr::SetSpecial(const std::string &strName)
662 if (strName.size()>6 && strName.substr(strName.size() - 6, 6) == ".onion") {
663 std::vector<unsigned char> vchAddr = DecodeBase32(strName.substr(0, strName.size() - 6).c_str());
664 if (vchAddr.size() != 16-sizeof(pchOnionCat))
666 memcpy(ip, pchOnionCat, sizeof(pchOnionCat));
667 for (unsigned int i=0; i<16-sizeof(pchOnionCat); i++)
668 ip[i + sizeof(pchOnionCat)] = vchAddr[i];
679 CNetAddr::CNetAddr(const struct in_addr& ipv4Addr)
681 SetRaw(NET_IPV4, (const uint8_t*)&ipv4Addr);
684 CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr)
686 SetRaw(NET_IPV6, (const uint8_t*)&ipv6Addr);
689 CNetAddr::CNetAddr(const char *pszIp, bool fAllowLookup)
692 std::vector<CNetAddr> vIP;
693 if (LookupHost(pszIp, vIP, 1, fAllowLookup))
697 CNetAddr::CNetAddr(const std::string &strIp, bool fAllowLookup)
700 std::vector<CNetAddr> vIP;
701 if (LookupHost(strIp.c_str(), vIP, 1, fAllowLookup))
705 unsigned int CNetAddr::GetByte(int n) const
710 bool CNetAddr::IsIPv4() const
712 return (memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0);
715 bool CNetAddr::IsIPv6() const
717 return (!IsIPv4() && !IsTor());
720 bool CNetAddr::IsRFC1918() const
724 (GetByte(3) == 192 && GetByte(2) == 168) ||
725 (GetByte(3) == 172 && (GetByte(2) >= 16 && GetByte(2) <= 31)));
728 bool CNetAddr::IsRFC2544() const
730 return IsIPv4() && GetByte(3) == 198 && (GetByte(2) == 18 || GetByte(2) == 19);
733 bool CNetAddr::IsRFC3927() const
735 return IsIPv4() && (GetByte(3) == 169 && GetByte(2) == 254);
738 bool CNetAddr::IsRFC6598() const
740 return IsIPv4() && GetByte(3) == 100 && GetByte(2) >= 64 && GetByte(2) <= 127;
743 bool CNetAddr::IsRFC5737() const
745 return IsIPv4() && ((GetByte(3) == 192 && GetByte(2) == 0 && GetByte(1) == 2) ||
746 (GetByte(3) == 198 && GetByte(2) == 51 && GetByte(1) == 100) ||
747 (GetByte(3) == 203 && GetByte(2) == 0 && GetByte(1) == 113));
750 bool CNetAddr::IsRFC3849() const
752 return GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x0D && GetByte(12) == 0xB8;
755 bool CNetAddr::IsRFC3964() const
757 return (GetByte(15) == 0x20 && GetByte(14) == 0x02);
760 bool CNetAddr::IsRFC6052() const
762 static const unsigned char pchRFC6052[] = {0,0x64,0xFF,0x9B,0,0,0,0,0,0,0,0};
763 return (memcmp(ip, pchRFC6052, sizeof(pchRFC6052)) == 0);
766 bool CNetAddr::IsRFC4380() const
768 return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0 && GetByte(12) == 0);
771 bool CNetAddr::IsRFC4862() const
773 static const unsigned char pchRFC4862[] = {0xFE,0x80,0,0,0,0,0,0};
774 return (memcmp(ip, pchRFC4862, sizeof(pchRFC4862)) == 0);
777 bool CNetAddr::IsRFC4193() const
779 return ((GetByte(15) & 0xFE) == 0xFC);
782 bool CNetAddr::IsRFC6145() const
784 static const unsigned char pchRFC6145[] = {0,0,0,0,0,0,0,0,0xFF,0xFF,0,0};
785 return (memcmp(ip, pchRFC6145, sizeof(pchRFC6145)) == 0);
788 bool CNetAddr::IsRFC4843() const
790 return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10);
793 bool CNetAddr::IsTor() const
795 return (memcmp(ip, pchOnionCat, sizeof(pchOnionCat)) == 0);
798 bool CNetAddr::IsLocal() const
801 if (IsIPv4() && (GetByte(3) == 127 || GetByte(3) == 0))
804 // IPv6 loopback (::1/128)
805 static const unsigned char pchLocal[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
806 if (memcmp(ip, pchLocal, 16) == 0)
812 bool CNetAddr::IsMulticast() const
814 return (IsIPv4() && (GetByte(3) & 0xF0) == 0xE0)
815 || (GetByte(15) == 0xFF);
818 bool CNetAddr::IsValid() const
820 // Cleanup 3-byte shifted addresses caused by garbage in size field
821 // of addr messages from versions before 0.2.9 checksum.
822 // Two consecutive addr messages look like this:
823 // header20 vectorlen3 addr26 addr26 addr26 header20 vectorlen3 addr26 addr26 addr26...
824 // so if the first length field is garbled, it reads the second batch
825 // of addr misaligned by 3 bytes.
826 if (memcmp(ip, pchIPv4+3, sizeof(pchIPv4)-3) == 0)
829 // unspecified IPv6 address (::/128)
830 unsigned char ipNone[16] = {};
831 if (memcmp(ip, ipNone, 16) == 0)
834 // documentation IPv6 address
841 uint32_t ipNone = INADDR_NONE;
842 if (memcmp(ip+12, &ipNone, 4) == 0)
847 if (memcmp(ip+12, &ipNone, 4) == 0)
854 bool CNetAddr::IsRoutable() const
856 return IsValid() && !(IsRFC1918() || IsRFC2544() || IsRFC3927() || IsRFC4862() || IsRFC6598() || IsRFC5737() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsLocal());
859 enum Network CNetAddr::GetNetwork() const
862 return NET_UNROUTABLE;
873 std::string CNetAddr::ToStringIP() const
876 return EncodeBase32(&ip[6], 10) + ".onion";
877 CService serv(*this, 0);
878 struct sockaddr_storage sockaddr;
879 socklen_t socklen = sizeof(sockaddr);
880 if (serv.GetSockAddr((struct sockaddr*)&sockaddr, &socklen)) {
881 char name[1025] = "";
882 if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), NULL, 0, NI_NUMERICHOST))
883 return std::string(name);
886 return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));
888 return strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
889 GetByte(15) << 8 | GetByte(14), GetByte(13) << 8 | GetByte(12),
890 GetByte(11) << 8 | GetByte(10), GetByte(9) << 8 | GetByte(8),
891 GetByte(7) << 8 | GetByte(6), GetByte(5) << 8 | GetByte(4),
892 GetByte(3) << 8 | GetByte(2), GetByte(1) << 8 | GetByte(0));
895 std::string CNetAddr::ToString() const
900 bool operator==(const CNetAddr& a, const CNetAddr& b)
902 return (memcmp(a.ip, b.ip, 16) == 0);
905 bool operator!=(const CNetAddr& a, const CNetAddr& b)
907 return (memcmp(a.ip, b.ip, 16) != 0);
910 bool operator<(const CNetAddr& a, const CNetAddr& b)
912 return (memcmp(a.ip, b.ip, 16) < 0);
915 bool CNetAddr::GetInAddr(struct in_addr* pipv4Addr) const
919 memcpy(pipv4Addr, ip+12, 4);
923 bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const
925 memcpy(pipv6Addr, ip, 16);
929 // get canonical identifier of an address' group
930 // no two connections will be attempted to addresses with the same group
931 std::vector<unsigned char> CNetAddr::GetGroup() const
933 std::vector<unsigned char> vchRet;
934 int nClass = NET_IPV6;
938 // all local addresses belong to the same group
945 // all unroutable addresses belong to the same group
948 nClass = NET_UNROUTABLE;
951 // for IPv4 addresses, '1' + the 16 higher-order bits of the IP
952 // includes mapped IPv4, SIIT translated IPv4, and the well-known prefix
953 else if (IsIPv4() || IsRFC6145() || IsRFC6052())
958 // for 6to4 tunnelled addresses, use the encapsulated IPv4 address
959 else if (IsRFC3964())
964 // for Teredo-tunnelled IPv6 addresses, use the encapsulated IPv4 address
965 else if (IsRFC4380())
967 vchRet.push_back(NET_IPV4);
968 vchRet.push_back(GetByte(3) ^ 0xFF);
969 vchRet.push_back(GetByte(2) ^ 0xFF);
978 // for he.net, use /36 groups
979 else if (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x04 && GetByte(12) == 0x70)
981 // for the rest of the IPv6 network, use /32 groups
985 vchRet.push_back(nClass);
988 vchRet.push_back(GetByte(15 - nStartByte));
993 vchRet.push_back(GetByte(15 - nStartByte) | ((1 << (8 - nBits)) - 1));
998 uint64_t CNetAddr::GetHash() const
1000 uint256 hash = Hash(&ip[0], &ip[16]);
1002 memcpy(&nRet, &hash, sizeof(nRet));
1006 // private extensions to enum Network, only returned by GetExtNetwork,
1007 // and only used in GetReachabilityFrom
1008 static const int NET_UNKNOWN = NET_MAX + 0;
1009 static const int NET_TEREDO = NET_MAX + 1;
1010 int static GetExtNetwork(const CNetAddr *addr)
1014 if (addr->IsRFC4380())
1016 return addr->GetNetwork();
1019 /** Calculates a metric for how reachable (*this) is from a given partner */
1020 int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const
1033 return REACH_UNREACHABLE;
1035 int ourNet = GetExtNetwork(this);
1036 int theirNet = GetExtNetwork(paddrPartner);
1037 bool fTunnel = IsRFC3964() || IsRFC6052() || IsRFC6145();
1042 default: return REACH_DEFAULT;
1043 case NET_IPV4: return REACH_IPV4;
1047 default: return REACH_DEFAULT;
1048 case NET_TEREDO: return REACH_TEREDO;
1049 case NET_IPV4: return REACH_IPV4;
1050 case NET_IPV6: return fTunnel ? REACH_IPV6_WEAK : REACH_IPV6_STRONG; // only prefer giving our IPv6 address if it's not tunnelled
1054 default: return REACH_DEFAULT;
1055 case NET_IPV4: return REACH_IPV4; // Tor users can connect to IPv4 as well
1056 case NET_TOR: return REACH_PRIVATE;
1060 default: return REACH_DEFAULT;
1061 case NET_TEREDO: return REACH_TEREDO;
1062 case NET_IPV6: return REACH_IPV6_WEAK;
1063 case NET_IPV4: return REACH_IPV4;
1066 case NET_UNROUTABLE:
1069 default: return REACH_DEFAULT;
1070 case NET_TEREDO: return REACH_TEREDO;
1071 case NET_IPV6: return REACH_IPV6_WEAK;
1072 case NET_IPV4: return REACH_IPV4;
1073 case NET_TOR: return REACH_PRIVATE; // either from Tor, or don't care about our address
1078 void CService::Init()
1083 CService::CService()
1088 CService::CService(const CNetAddr& cip, unsigned short portIn) : CNetAddr(cip), port(portIn)
1092 CService::CService(const struct in_addr& ipv4Addr, unsigned short portIn) : CNetAddr(ipv4Addr), port(portIn)
1096 CService::CService(const struct in6_addr& ipv6Addr, unsigned short portIn) : CNetAddr(ipv6Addr), port(portIn)
1100 CService::CService(const struct sockaddr_in& addr) : CNetAddr(addr.sin_addr), port(ntohs(addr.sin_port))
1102 assert(addr.sin_family == AF_INET);
1105 CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr), port(ntohs(addr.sin6_port))
1107 assert(addr.sin6_family == AF_INET6);
1110 bool CService::SetSockAddr(const struct sockaddr *paddr)
1112 switch (paddr->sa_family) {
1114 *this = CService(*(const struct sockaddr_in*)paddr);
1117 *this = CService(*(const struct sockaddr_in6*)paddr);
1124 CService::CService(const char *pszIpPort, bool fAllowLookup)
1128 if (Lookup(pszIpPort, ip, 0, fAllowLookup))
1132 CService::CService(const char *pszIpPort, int portDefault, bool fAllowLookup)
1136 if (Lookup(pszIpPort, ip, portDefault, fAllowLookup))
1140 CService::CService(const std::string &strIpPort, bool fAllowLookup)
1144 if (Lookup(strIpPort.c_str(), ip, 0, fAllowLookup))
1148 CService::CService(const std::string &strIpPort, int portDefault, bool fAllowLookup)
1152 if (Lookup(strIpPort.c_str(), ip, portDefault, fAllowLookup))
1156 unsigned short CService::GetPort() const
1161 bool operator==(const CService& a, const CService& b)
1163 return (CNetAddr)a == (CNetAddr)b && a.port == b.port;
1166 bool operator!=(const CService& a, const CService& b)
1168 return (CNetAddr)a != (CNetAddr)b || a.port != b.port;
1171 bool operator<(const CService& a, const CService& b)
1173 return (CNetAddr)a < (CNetAddr)b || ((CNetAddr)a == (CNetAddr)b && a.port < b.port);
1176 bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const
1179 if (*addrlen < (socklen_t)sizeof(struct sockaddr_in))
1181 *addrlen = sizeof(struct sockaddr_in);
1182 struct sockaddr_in *paddrin = (struct sockaddr_in*)paddr;
1183 memset(paddrin, 0, *addrlen);
1184 if (!GetInAddr(&paddrin->sin_addr))
1186 paddrin->sin_family = AF_INET;
1187 paddrin->sin_port = htons(port);
1191 if (*addrlen < (socklen_t)sizeof(struct sockaddr_in6))
1193 *addrlen = sizeof(struct sockaddr_in6);
1194 struct sockaddr_in6 *paddrin6 = (struct sockaddr_in6*)paddr;
1195 memset(paddrin6, 0, *addrlen);
1196 if (!GetIn6Addr(&paddrin6->sin6_addr))
1198 paddrin6->sin6_family = AF_INET6;
1199 paddrin6->sin6_port = htons(port);
1205 std::vector<unsigned char> CService::GetKey() const
1207 std::vector<unsigned char> vKey;
1209 memcpy(&vKey[0], ip, 16);
1210 vKey[16] = port / 0x100;
1211 vKey[17] = port & 0x0FF;
1215 std::string CService::ToStringPort() const
1217 return strprintf("%u", port);
1220 std::string CService::ToStringIPPort() const
1222 if (IsIPv4() || IsTor()) {
1223 return ToStringIP() + ":" + ToStringPort();
1225 return "[" + ToStringIP() + "]:" + ToStringPort();
1229 std::string CService::ToString() const
1231 return ToStringIPPort();
1234 void CService::SetPort(unsigned short portIn)
1242 memset(netmask, 0, sizeof(netmask));
1245 CSubNet::CSubNet(const std::string &strSubnet, bool fAllowLookup)
1247 size_t slash = strSubnet.find_last_of('/');
1248 std::vector<CNetAddr> vIP;
1251 // Default to /32 (IPv4) or /128 (IPv6), i.e. match single address
1252 memset(netmask, 255, sizeof(netmask));
1254 std::string strAddress = strSubnet.substr(0, slash);
1255 if (LookupHost(strAddress.c_str(), vIP, 1, fAllowLookup))
1258 if (slash != strSubnet.npos)
1260 std::string strNetmask = strSubnet.substr(slash + 1);
1262 // IPv4 addresses start at offset 12, and first 12 bytes must match, so just offset n
1263 const int astartofs = network.IsIPv4() ? 12 : 0;
1264 if (ParseInt32(strNetmask, &n)) // If valid number, assume /24 symtex
1266 if(n >= 0 && n <= (128 - astartofs*8)) // Only valid if in range of bits of address
1269 // Clear bits [n..127]
1270 for (; n < 128; ++n)
1271 netmask[n>>3] &= ~(1<<(7-(n&7)));
1278 else // If not a valid number, try full netmask syntax
1280 if (LookupHost(strNetmask.c_str(), vIP, 1, false)) // Never allow lookup for netmask
1282 // Copy only the *last* four bytes in case of IPv4, the rest of the mask should stay 1's as
1283 // we don't want pchIPv4 to be part of the mask.
1284 for(int x=astartofs; x<16; ++x)
1285 netmask[x] = vIP[0].ip[x];
1299 // Normalize network according to netmask
1300 for(int x=0; x<16; ++x)
1301 network.ip[x] &= netmask[x];
1304 bool CSubNet::Match(const CNetAddr &addr) const
1306 if (!valid || !addr.IsValid())
1308 for(int x=0; x<16; ++x)
1309 if ((addr.ip[x] & netmask[x]) != network.ip[x])
1314 std::string CSubNet::ToString() const
1316 std::string strNetmask;
1317 if (network.IsIPv4())
1318 strNetmask = strprintf("%u.%u.%u.%u", netmask[12], netmask[13], netmask[14], netmask[15]);
1320 strNetmask = strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
1321 netmask[0] << 8 | netmask[1], netmask[2] << 8 | netmask[3],
1322 netmask[4] << 8 | netmask[5], netmask[6] << 8 | netmask[7],
1323 netmask[8] << 8 | netmask[9], netmask[10] << 8 | netmask[11],
1324 netmask[12] << 8 | netmask[13], netmask[14] << 8 | netmask[15]);
1325 return network.ToString() + "/" + strNetmask;
1328 bool CSubNet::IsValid() const
1333 bool operator==(const CSubNet& a, const CSubNet& b)
1335 return a.valid == b.valid && a.network == b.network && !memcmp(a.netmask, b.netmask, 16);
1338 bool operator!=(const CSubNet& a, const CSubNet& b)
1344 std::string NetworkErrorString(int err)
1348 if(FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,
1349 NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
1350 buf, sizeof(buf), NULL))
1352 return strprintf("%s (%d)", buf, err);
1356 return strprintf("Unknown error (%d)", err);
1360 std::string NetworkErrorString(int err)
1363 const char *s = buf;
1365 /* Too bad there are two incompatible implementations of the
1366 * thread-safe strerror. */
1367 #ifdef STRERROR_R_CHAR_P /* GNU variant can return a pointer outside the passed buffer */
1368 s = strerror_r(err, buf, sizeof(buf));
1369 #else /* POSIX variant always returns message in buffer */
1370 if (strerror_r(err, buf, sizeof(buf)))
1373 return strprintf("%s (%d)", s, err);
1377 bool CloseSocket(SOCKET& hSocket)
1379 if (hSocket == INVALID_SOCKET)
1382 int ret = closesocket(hSocket);
1384 int ret = close(hSocket);
1386 hSocket = INVALID_SOCKET;
1387 return ret != SOCKET_ERROR;
1390 bool SetSocketNonBlocking(SOCKET& hSocket, bool fNonBlocking)
1395 if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR) {
1397 int fFlags = fcntl(hSocket, F_GETFL, 0);
1398 if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == SOCKET_ERROR) {
1400 CloseSocket(hSocket);
1406 if (ioctlsocket(hSocket, FIONBIO, &nZero) == SOCKET_ERROR) {
1408 int fFlags = fcntl(hSocket, F_GETFL, 0);
1409 if (fcntl(hSocket, F_SETFL, fFlags & ~O_NONBLOCK) == SOCKET_ERROR) {
1411 CloseSocket(hSocket);