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);
230 struct timeval MillisToTimeval(int64_t nTimeout)
232 struct timeval timeout;
233 timeout.tv_sec = nTimeout / 1000;
234 timeout.tv_usec = (nTimeout % 1000) * 1000;
239 * Read bytes from socket. This will either read the full number of bytes requested
240 * or return False on error or timeout.
241 * This function can be interrupted by boost thread interrupt.
243 * @param data Buffer to receive into
244 * @param len Length of data to receive
245 * @param timeout Timeout in milliseconds for receive operation
247 * @note This function requires that hSocket is in non-blocking mode.
249 bool static InterruptibleRecv(char* data, size_t len, int timeout, SOCKET& hSocket)
251 int64_t curTime = GetTimeMillis();
252 int64_t endTime = curTime + timeout;
253 // Maximum time to wait in one select call. It will take up until this time (in millis)
254 // to break off in case of an interruption.
255 const int64_t maxWait = 1000;
256 while (len > 0 && curTime < endTime) {
257 ssize_t ret = recv(hSocket, data, len, 0); // Optimistically try the recv first
261 } else if (ret == 0) { // Unexpected disconnection
263 } else { // Other error or blocking
264 int nErr = WSAGetLastError();
265 if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL) {
266 if (!IsSelectableSocket(hSocket)) {
269 struct timeval tval = MillisToTimeval(std::min(endTime - curTime, maxWait));
272 FD_SET(hSocket, &fdset);
273 int nRet = select(hSocket + 1, &fdset, NULL, NULL, &tval);
274 if (nRet == SOCKET_ERROR) {
281 boost::this_thread::interruption_point();
282 curTime = GetTimeMillis();
287 struct ProxyCredentials
289 std::string username;
290 std::string password;
293 /** Connect using SOCKS5 (as described in RFC1928) */
294 static bool Socks5(const std::string& strDest, int port, const ProxyCredentials *auth, SOCKET& hSocket)
296 LogPrintf("SOCKS5 connecting %s\n", strDest);
297 if (strDest.size() > 255) {
298 CloseSocket(hSocket);
299 return error("Hostname too long");
301 // Accepted authentication methods
302 std::vector<uint8_t> vSocks5Init;
303 vSocks5Init.push_back(0x05);
305 vSocks5Init.push_back(0x02); // # METHODS
306 vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
307 vSocks5Init.push_back(0x02); // X'02' USERNAME/PASSWORD (RFC1929)
309 vSocks5Init.push_back(0x01); // # METHODS
310 vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
312 ssize_t ret = send(hSocket, (const char*)begin_ptr(vSocks5Init), vSocks5Init.size(), MSG_NOSIGNAL);
313 if (ret != (ssize_t)vSocks5Init.size()) {
314 CloseSocket(hSocket);
315 return error("Error sending to proxy");
318 if (!InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
319 CloseSocket(hSocket);
320 return error("Error reading proxy response");
322 if (pchRet1[0] != 0x05) {
323 CloseSocket(hSocket);
324 return error("Proxy failed to initialize");
326 if (pchRet1[1] == 0x02 && auth) {
327 // Perform username/password authentication (as described in RFC1929)
328 std::vector<uint8_t> vAuth;
329 vAuth.push_back(0x01);
330 if (auth->username.size() > 255 || auth->password.size() > 255)
331 return error("Proxy username or password too long");
332 vAuth.push_back(auth->username.size());
333 vAuth.insert(vAuth.end(), auth->username.begin(), auth->username.end());
334 vAuth.push_back(auth->password.size());
335 vAuth.insert(vAuth.end(), auth->password.begin(), auth->password.end());
336 ret = send(hSocket, (const char*)begin_ptr(vAuth), vAuth.size(), MSG_NOSIGNAL);
337 if (ret != (ssize_t)vAuth.size()) {
338 CloseSocket(hSocket);
339 return error("Error sending authentication to proxy");
341 LogPrint("proxy", "SOCKS5 sending proxy authentication %s:%s\n", auth->username, auth->password);
343 if (!InterruptibleRecv(pchRetA, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
344 CloseSocket(hSocket);
345 return error("Error reading proxy authentication response");
347 if (pchRetA[0] != 0x01 || pchRetA[1] != 0x00) {
348 CloseSocket(hSocket);
349 return error("Proxy authentication unsuccessful");
351 } else if (pchRet1[1] == 0x00) {
352 // Perform no authentication
354 CloseSocket(hSocket);
355 return error("Proxy requested wrong authentication method %02x", pchRet1[1]);
357 std::vector<uint8_t> vSocks5;
358 vSocks5.push_back(0x05); // VER protocol version
359 vSocks5.push_back(0x01); // CMD CONNECT
360 vSocks5.push_back(0x00); // RSV Reserved
361 vSocks5.push_back(0x03); // ATYP DOMAINNAME
362 vSocks5.push_back(strDest.size()); // Length<=255 is checked at beginning of function
363 vSocks5.insert(vSocks5.end(), strDest.begin(), strDest.end());
364 vSocks5.push_back((port >> 8) & 0xFF);
365 vSocks5.push_back((port >> 0) & 0xFF);
366 ret = send(hSocket, (const char*)begin_ptr(vSocks5), vSocks5.size(), MSG_NOSIGNAL);
367 if (ret != (ssize_t)vSocks5.size()) {
368 CloseSocket(hSocket);
369 return error("Error sending to proxy");
372 if (!InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket)) {
373 CloseSocket(hSocket);
374 return error("Error reading proxy response");
376 if (pchRet2[0] != 0x05) {
377 CloseSocket(hSocket);
378 return error("Proxy failed to accept request");
380 if (pchRet2[1] != 0x00) {
381 CloseSocket(hSocket);
384 case 0x01: return error("Proxy error: general failure");
385 case 0x02: return error("Proxy error: connection not allowed");
386 case 0x03: return error("Proxy error: network unreachable");
387 case 0x04: return error("Proxy error: host unreachable");
388 case 0x05: return error("Proxy error: connection refused");
389 case 0x06: return error("Proxy error: TTL expired");
390 case 0x07: return error("Proxy error: protocol error");
391 case 0x08: return error("Proxy error: address type not supported");
392 default: return error("Proxy error: unknown");
395 if (pchRet2[2] != 0x00) {
396 CloseSocket(hSocket);
397 return error("Error: malformed proxy response");
402 case 0x01: ret = InterruptibleRecv(pchRet3, 4, SOCKS5_RECV_TIMEOUT, hSocket); break;
403 case 0x04: ret = InterruptibleRecv(pchRet3, 16, SOCKS5_RECV_TIMEOUT, hSocket); break;
406 ret = InterruptibleRecv(pchRet3, 1, SOCKS5_RECV_TIMEOUT, hSocket);
408 CloseSocket(hSocket);
409 return error("Error reading from proxy");
411 int nRecv = pchRet3[0];
412 ret = InterruptibleRecv(pchRet3, nRecv, SOCKS5_RECV_TIMEOUT, hSocket);
415 default: CloseSocket(hSocket); return error("Error: malformed proxy response");
418 CloseSocket(hSocket);
419 return error("Error reading from proxy");
421 if (!InterruptibleRecv(pchRet3, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
422 CloseSocket(hSocket);
423 return error("Error reading from proxy");
425 LogPrintf("SOCKS5 connected %s\n", strDest);
429 bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRet, int nTimeout)
431 hSocketRet = INVALID_SOCKET;
433 struct sockaddr_storage sockaddr;
434 socklen_t len = sizeof(sockaddr);
435 if (!addrConnect.GetSockAddr((struct sockaddr*)&sockaddr, &len)) {
436 LogPrintf("Cannot connect to %s: unsupported network\n", addrConnect.ToString());
440 SOCKET hSocket = socket(((struct sockaddr*)&sockaddr)->sa_family, SOCK_STREAM, IPPROTO_TCP);
441 if (hSocket == INVALID_SOCKET)
446 // Different way of disabling SIGPIPE on BSD
447 setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
450 //Disable Nagle's algorithm
452 setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&set, sizeof(int));
454 setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (void*)&set, sizeof(int));
457 // Set to non-blocking
458 if (!SetSocketNonBlocking(hSocket, true))
459 return error("ConnectSocketDirectly: Setting socket to non-blocking failed, error %s\n", NetworkErrorString(WSAGetLastError()));
461 if (connect(hSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR)
463 int nErr = WSAGetLastError();
464 // WSAEINVAL is here because some legacy version of winsock uses it
465 if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL)
467 struct timeval timeout = MillisToTimeval(nTimeout);
470 FD_SET(hSocket, &fdset);
471 int nRet = select(hSocket + 1, NULL, &fdset, NULL, &timeout);
474 LogPrint("net", "connection to %s timeout\n", addrConnect.ToString());
475 CloseSocket(hSocket);
478 if (nRet == SOCKET_ERROR)
480 LogPrintf("select() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
481 CloseSocket(hSocket);
484 socklen_t nRetSize = sizeof(nRet);
486 if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, (char*)(&nRet), &nRetSize) == SOCKET_ERROR)
488 if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, &nRet, &nRetSize) == SOCKET_ERROR)
491 LogPrintf("getsockopt() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
492 CloseSocket(hSocket);
497 LogPrintf("connect() to %s failed after select(): %s\n", addrConnect.ToString(), NetworkErrorString(nRet));
498 CloseSocket(hSocket);
503 else if (WSAGetLastError() != WSAEISCONN)
508 LogPrintf("connect() to %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
509 CloseSocket(hSocket);
514 hSocketRet = hSocket;
518 bool SetProxy(enum Network net, const proxyType &addrProxy) {
519 assert(net >= 0 && net < NET_MAX);
520 if (!addrProxy.IsValid())
523 proxyInfo[net] = addrProxy;
527 bool GetProxy(enum Network net, proxyType &proxyInfoOut) {
528 assert(net >= 0 && net < NET_MAX);
530 if (!proxyInfo[net].IsValid())
532 proxyInfoOut = proxyInfo[net];
536 bool SetNameProxy(const proxyType &addrProxy) {
537 if (!addrProxy.IsValid())
540 nameProxy = addrProxy;
544 bool GetNameProxy(proxyType &nameProxyOut) {
546 if(!nameProxy.IsValid())
548 nameProxyOut = nameProxy;
552 bool HaveNameProxy() {
554 return nameProxy.IsValid();
557 bool IsProxy(const CNetAddr &addr) {
559 for (int i = 0; i < NET_MAX; i++) {
560 if (addr == (CNetAddr)proxyInfo[i].proxy)
566 static bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int port, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
568 SOCKET hSocket = INVALID_SOCKET;
569 // first connect to proxy server
570 if (!ConnectSocketDirectly(proxy.proxy, hSocket, nTimeout)) {
571 if (outProxyConnectionFailed)
572 *outProxyConnectionFailed = true;
575 // do socks negotiation
576 if (proxy.randomize_credentials) {
577 ProxyCredentials random_auth;
578 random_auth.username = strprintf("%i", insecure_rand());
579 random_auth.password = strprintf("%i", insecure_rand());
580 if (!Socks5(strDest, (unsigned short)port, &random_auth, hSocket))
583 if (!Socks5(strDest, (unsigned short)port, 0, hSocket))
587 hSocketRet = hSocket;
591 bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
594 if (outProxyConnectionFailed)
595 *outProxyConnectionFailed = false;
597 if (GetProxy(addrDest.GetNetwork(), proxy))
598 return ConnectThroughProxy(proxy, addrDest.ToStringIP(), addrDest.GetPort(), hSocketRet, nTimeout, outProxyConnectionFailed);
599 else // no proxy needed (none set for target network)
600 return ConnectSocketDirectly(addrDest, hSocketRet, nTimeout);
603 bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest, int portDefault, int nTimeout, bool *outProxyConnectionFailed)
606 int port = portDefault;
608 if (outProxyConnectionFailed)
609 *outProxyConnectionFailed = false;
611 SplitHostPort(std::string(pszDest), port, strDest);
614 GetNameProxy(nameProxy);
616 CService addrResolved(CNetAddr(strDest, fNameLookup && !HaveNameProxy()), port);
617 if (addrResolved.IsValid()) {
619 return ConnectSocket(addr, hSocketRet, nTimeout);
622 addr = CService("0.0.0.0:0");
624 if (!HaveNameProxy())
626 return ConnectThroughProxy(nameProxy, strDest, port, hSocketRet, nTimeout, outProxyConnectionFailed);
629 void CNetAddr::Init()
631 memset(ip, 0, sizeof(ip));
634 void CNetAddr::SetIP(const CNetAddr& ipIn)
636 memcpy(ip, ipIn.ip, sizeof(ip));
639 void CNetAddr::SetRaw(Network network, const uint8_t *ip_in)
644 memcpy(ip, pchIPv4, 12);
645 memcpy(ip+12, ip_in, 4);
648 memcpy(ip, ip_in, 16);
651 assert(!"invalid network");
655 static const unsigned char pchOnionCat[] = {0xFD,0x87,0xD8,0x7E,0xEB,0x43};
657 bool CNetAddr::SetSpecial(const std::string &strName)
659 if (strName.size()>6 && strName.substr(strName.size() - 6, 6) == ".onion") {
660 std::vector<unsigned char> vchAddr = DecodeBase32(strName.substr(0, strName.size() - 6).c_str());
661 if (vchAddr.size() != 16-sizeof(pchOnionCat))
663 memcpy(ip, pchOnionCat, sizeof(pchOnionCat));
664 for (unsigned int i=0; i<16-sizeof(pchOnionCat); i++)
665 ip[i + sizeof(pchOnionCat)] = vchAddr[i];
676 CNetAddr::CNetAddr(const struct in_addr& ipv4Addr)
678 SetRaw(NET_IPV4, (const uint8_t*)&ipv4Addr);
681 CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr)
683 SetRaw(NET_IPV6, (const uint8_t*)&ipv6Addr);
686 CNetAddr::CNetAddr(const char *pszIp, bool fAllowLookup)
689 std::vector<CNetAddr> vIP;
690 if (LookupHost(pszIp, vIP, 1, fAllowLookup))
694 CNetAddr::CNetAddr(const std::string &strIp, bool fAllowLookup)
697 std::vector<CNetAddr> vIP;
698 if (LookupHost(strIp.c_str(), vIP, 1, fAllowLookup))
702 unsigned int CNetAddr::GetByte(int n) const
707 bool CNetAddr::IsIPv4() const
709 return (memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0);
712 bool CNetAddr::IsIPv6() const
714 return (!IsIPv4() && !IsTor());
717 bool CNetAddr::IsRFC1918() const
721 (GetByte(3) == 192 && GetByte(2) == 168) ||
722 (GetByte(3) == 172 && (GetByte(2) >= 16 && GetByte(2) <= 31)));
725 bool CNetAddr::IsRFC2544() const
727 return IsIPv4() && GetByte(3) == 198 && (GetByte(2) == 18 || GetByte(2) == 19);
730 bool CNetAddr::IsRFC3927() const
732 return IsIPv4() && (GetByte(3) == 169 && GetByte(2) == 254);
735 bool CNetAddr::IsRFC6598() const
737 return IsIPv4() && GetByte(3) == 100 && GetByte(2) >= 64 && GetByte(2) <= 127;
740 bool CNetAddr::IsRFC5737() const
742 return IsIPv4() && ((GetByte(3) == 192 && GetByte(2) == 0 && GetByte(1) == 2) ||
743 (GetByte(3) == 198 && GetByte(2) == 51 && GetByte(1) == 100) ||
744 (GetByte(3) == 203 && GetByte(2) == 0 && GetByte(1) == 113));
747 bool CNetAddr::IsRFC3849() const
749 return GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x0D && GetByte(12) == 0xB8;
752 bool CNetAddr::IsRFC3964() const
754 return (GetByte(15) == 0x20 && GetByte(14) == 0x02);
757 bool CNetAddr::IsRFC6052() const
759 static const unsigned char pchRFC6052[] = {0,0x64,0xFF,0x9B,0,0,0,0,0,0,0,0};
760 return (memcmp(ip, pchRFC6052, sizeof(pchRFC6052)) == 0);
763 bool CNetAddr::IsRFC4380() const
765 return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0 && GetByte(12) == 0);
768 bool CNetAddr::IsRFC4862() const
770 static const unsigned char pchRFC4862[] = {0xFE,0x80,0,0,0,0,0,0};
771 return (memcmp(ip, pchRFC4862, sizeof(pchRFC4862)) == 0);
774 bool CNetAddr::IsRFC4193() const
776 return ((GetByte(15) & 0xFE) == 0xFC);
779 bool CNetAddr::IsRFC6145() const
781 static const unsigned char pchRFC6145[] = {0,0,0,0,0,0,0,0,0xFF,0xFF,0,0};
782 return (memcmp(ip, pchRFC6145, sizeof(pchRFC6145)) == 0);
785 bool CNetAddr::IsRFC4843() const
787 return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10);
790 bool CNetAddr::IsTor() const
792 return (memcmp(ip, pchOnionCat, sizeof(pchOnionCat)) == 0);
795 bool CNetAddr::IsLocal() const
798 if (IsIPv4() && (GetByte(3) == 127 || GetByte(3) == 0))
801 // IPv6 loopback (::1/128)
802 static const unsigned char pchLocal[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
803 if (memcmp(ip, pchLocal, 16) == 0)
809 bool CNetAddr::IsMulticast() const
811 return (IsIPv4() && (GetByte(3) & 0xF0) == 0xE0)
812 || (GetByte(15) == 0xFF);
815 bool CNetAddr::IsValid() const
817 // Cleanup 3-byte shifted addresses caused by garbage in size field
818 // of addr messages from versions before 0.2.9 checksum.
819 // Two consecutive addr messages look like this:
820 // header20 vectorlen3 addr26 addr26 addr26 header20 vectorlen3 addr26 addr26 addr26...
821 // so if the first length field is garbled, it reads the second batch
822 // of addr misaligned by 3 bytes.
823 if (memcmp(ip, pchIPv4+3, sizeof(pchIPv4)-3) == 0)
826 // unspecified IPv6 address (::/128)
827 unsigned char ipNone[16] = {};
828 if (memcmp(ip, ipNone, 16) == 0)
831 // documentation IPv6 address
838 uint32_t ipNone = INADDR_NONE;
839 if (memcmp(ip+12, &ipNone, 4) == 0)
844 if (memcmp(ip+12, &ipNone, 4) == 0)
851 bool CNetAddr::IsRoutable() const
853 return IsValid() && !(IsRFC1918() || IsRFC2544() || IsRFC3927() || IsRFC4862() || IsRFC6598() || IsRFC5737() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsLocal());
856 enum Network CNetAddr::GetNetwork() const
859 return NET_UNROUTABLE;
870 std::string CNetAddr::ToStringIP() const
873 return EncodeBase32(&ip[6], 10) + ".onion";
874 CService serv(*this, 0);
875 struct sockaddr_storage sockaddr;
876 socklen_t socklen = sizeof(sockaddr);
877 if (serv.GetSockAddr((struct sockaddr*)&sockaddr, &socklen)) {
878 char name[1025] = "";
879 if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), NULL, 0, NI_NUMERICHOST))
880 return std::string(name);
883 return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));
885 return strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
886 GetByte(15) << 8 | GetByte(14), GetByte(13) << 8 | GetByte(12),
887 GetByte(11) << 8 | GetByte(10), GetByte(9) << 8 | GetByte(8),
888 GetByte(7) << 8 | GetByte(6), GetByte(5) << 8 | GetByte(4),
889 GetByte(3) << 8 | GetByte(2), GetByte(1) << 8 | GetByte(0));
892 std::string CNetAddr::ToString() const
897 bool operator==(const CNetAddr& a, const CNetAddr& b)
899 return (memcmp(a.ip, b.ip, 16) == 0);
902 bool operator!=(const CNetAddr& a, const CNetAddr& b)
904 return (memcmp(a.ip, b.ip, 16) != 0);
907 bool operator<(const CNetAddr& a, const CNetAddr& b)
909 return (memcmp(a.ip, b.ip, 16) < 0);
912 bool CNetAddr::GetInAddr(struct in_addr* pipv4Addr) const
916 memcpy(pipv4Addr, ip+12, 4);
920 bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const
922 memcpy(pipv6Addr, ip, 16);
926 // get canonical identifier of an address' group
927 // no two connections will be attempted to addresses with the same group
928 std::vector<unsigned char> CNetAddr::GetGroup() const
930 std::vector<unsigned char> vchRet;
931 int nClass = NET_IPV6;
935 // all local addresses belong to the same group
942 // all unroutable addresses belong to the same group
945 nClass = NET_UNROUTABLE;
948 // for IPv4 addresses, '1' + the 16 higher-order bits of the IP
949 // includes mapped IPv4, SIIT translated IPv4, and the well-known prefix
950 else if (IsIPv4() || IsRFC6145() || IsRFC6052())
955 // for 6to4 tunnelled addresses, use the encapsulated IPv4 address
956 else if (IsRFC3964())
961 // for Teredo-tunnelled IPv6 addresses, use the encapsulated IPv4 address
962 else if (IsRFC4380())
964 vchRet.push_back(NET_IPV4);
965 vchRet.push_back(GetByte(3) ^ 0xFF);
966 vchRet.push_back(GetByte(2) ^ 0xFF);
975 // for he.net, use /36 groups
976 else if (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x04 && GetByte(12) == 0x70)
978 // for the rest of the IPv6 network, use /32 groups
982 vchRet.push_back(nClass);
985 vchRet.push_back(GetByte(15 - nStartByte));
990 vchRet.push_back(GetByte(15 - nStartByte) | ((1 << (8 - nBits)) - 1));
995 uint64_t CNetAddr::GetHash() const
997 uint256 hash = Hash(&ip[0], &ip[16]);
999 memcpy(&nRet, &hash, sizeof(nRet));
1003 // private extensions to enum Network, only returned by GetExtNetwork,
1004 // and only used in GetReachabilityFrom
1005 static const int NET_UNKNOWN = NET_MAX + 0;
1006 static const int NET_TEREDO = NET_MAX + 1;
1007 int static GetExtNetwork(const CNetAddr *addr)
1011 if (addr->IsRFC4380())
1013 return addr->GetNetwork();
1016 /** Calculates a metric for how reachable (*this) is from a given partner */
1017 int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const
1030 return REACH_UNREACHABLE;
1032 int ourNet = GetExtNetwork(this);
1033 int theirNet = GetExtNetwork(paddrPartner);
1034 bool fTunnel = IsRFC3964() || IsRFC6052() || IsRFC6145();
1039 default: return REACH_DEFAULT;
1040 case NET_IPV4: return REACH_IPV4;
1044 default: return REACH_DEFAULT;
1045 case NET_TEREDO: return REACH_TEREDO;
1046 case NET_IPV4: return REACH_IPV4;
1047 case NET_IPV6: return fTunnel ? REACH_IPV6_WEAK : REACH_IPV6_STRONG; // only prefer giving our IPv6 address if it's not tunnelled
1051 default: return REACH_DEFAULT;
1052 case NET_IPV4: return REACH_IPV4; // Tor users can connect to IPv4 as well
1053 case NET_TOR: return REACH_PRIVATE;
1057 default: return REACH_DEFAULT;
1058 case NET_TEREDO: return REACH_TEREDO;
1059 case NET_IPV6: return REACH_IPV6_WEAK;
1060 case NET_IPV4: return REACH_IPV4;
1063 case NET_UNROUTABLE:
1066 default: return REACH_DEFAULT;
1067 case NET_TEREDO: return REACH_TEREDO;
1068 case NET_IPV6: return REACH_IPV6_WEAK;
1069 case NET_IPV4: return REACH_IPV4;
1070 case NET_TOR: return REACH_PRIVATE; // either from Tor, or don't care about our address
1075 void CService::Init()
1080 CService::CService()
1085 CService::CService(const CNetAddr& cip, unsigned short portIn) : CNetAddr(cip), port(portIn)
1089 CService::CService(const struct in_addr& ipv4Addr, unsigned short portIn) : CNetAddr(ipv4Addr), port(portIn)
1093 CService::CService(const struct in6_addr& ipv6Addr, unsigned short portIn) : CNetAddr(ipv6Addr), port(portIn)
1097 CService::CService(const struct sockaddr_in& addr) : CNetAddr(addr.sin_addr), port(ntohs(addr.sin_port))
1099 assert(addr.sin_family == AF_INET);
1102 CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr), port(ntohs(addr.sin6_port))
1104 assert(addr.sin6_family == AF_INET6);
1107 bool CService::SetSockAddr(const struct sockaddr *paddr)
1109 switch (paddr->sa_family) {
1111 *this = CService(*(const struct sockaddr_in*)paddr);
1114 *this = CService(*(const struct sockaddr_in6*)paddr);
1121 CService::CService(const char *pszIpPort, bool fAllowLookup)
1125 if (Lookup(pszIpPort, ip, 0, fAllowLookup))
1129 CService::CService(const char *pszIpPort, int portDefault, bool fAllowLookup)
1133 if (Lookup(pszIpPort, ip, portDefault, fAllowLookup))
1137 CService::CService(const std::string &strIpPort, bool fAllowLookup)
1141 if (Lookup(strIpPort.c_str(), ip, 0, fAllowLookup))
1145 CService::CService(const std::string &strIpPort, int portDefault, bool fAllowLookup)
1149 if (Lookup(strIpPort.c_str(), ip, portDefault, fAllowLookup))
1153 unsigned short CService::GetPort() const
1158 bool operator==(const CService& a, const CService& b)
1160 return (CNetAddr)a == (CNetAddr)b && a.port == b.port;
1163 bool operator!=(const CService& a, const CService& b)
1165 return (CNetAddr)a != (CNetAddr)b || a.port != b.port;
1168 bool operator<(const CService& a, const CService& b)
1170 return (CNetAddr)a < (CNetAddr)b || ((CNetAddr)a == (CNetAddr)b && a.port < b.port);
1173 bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const
1176 if (*addrlen < (socklen_t)sizeof(struct sockaddr_in))
1178 *addrlen = sizeof(struct sockaddr_in);
1179 struct sockaddr_in *paddrin = (struct sockaddr_in*)paddr;
1180 memset(paddrin, 0, *addrlen);
1181 if (!GetInAddr(&paddrin->sin_addr))
1183 paddrin->sin_family = AF_INET;
1184 paddrin->sin_port = htons(port);
1188 if (*addrlen < (socklen_t)sizeof(struct sockaddr_in6))
1190 *addrlen = sizeof(struct sockaddr_in6);
1191 struct sockaddr_in6 *paddrin6 = (struct sockaddr_in6*)paddr;
1192 memset(paddrin6, 0, *addrlen);
1193 if (!GetIn6Addr(&paddrin6->sin6_addr))
1195 paddrin6->sin6_family = AF_INET6;
1196 paddrin6->sin6_port = htons(port);
1202 std::vector<unsigned char> CService::GetKey() const
1204 std::vector<unsigned char> vKey;
1206 memcpy(&vKey[0], ip, 16);
1207 vKey[16] = port / 0x100;
1208 vKey[17] = port & 0x0FF;
1212 std::string CService::ToStringPort() const
1214 return strprintf("%u", port);
1217 std::string CService::ToStringIPPort() const
1219 if (IsIPv4() || IsTor()) {
1220 return ToStringIP() + ":" + ToStringPort();
1222 return "[" + ToStringIP() + "]:" + ToStringPort();
1226 std::string CService::ToString() const
1228 return ToStringIPPort();
1231 void CService::SetPort(unsigned short portIn)
1239 memset(netmask, 0, sizeof(netmask));
1242 CSubNet::CSubNet(const std::string &strSubnet, bool fAllowLookup)
1244 size_t slash = strSubnet.find_last_of('/');
1245 std::vector<CNetAddr> vIP;
1248 // Default to /32 (IPv4) or /128 (IPv6), i.e. match single address
1249 memset(netmask, 255, sizeof(netmask));
1251 std::string strAddress = strSubnet.substr(0, slash);
1252 if (LookupHost(strAddress.c_str(), vIP, 1, fAllowLookup))
1255 if (slash != strSubnet.npos)
1257 std::string strNetmask = strSubnet.substr(slash + 1);
1259 // IPv4 addresses start at offset 12, and first 12 bytes must match, so just offset n
1260 const int astartofs = network.IsIPv4() ? 12 : 0;
1261 if (ParseInt32(strNetmask, &n)) // If valid number, assume /24 symtex
1263 if(n >= 0 && n <= (128 - astartofs*8)) // Only valid if in range of bits of address
1266 // Clear bits [n..127]
1267 for (; n < 128; ++n)
1268 netmask[n>>3] &= ~(1<<(7-(n&7)));
1275 else // If not a valid number, try full netmask syntax
1277 if (LookupHost(strNetmask.c_str(), vIP, 1, false)) // Never allow lookup for netmask
1279 // Copy only the *last* four bytes in case of IPv4, the rest of the mask should stay 1's as
1280 // we don't want pchIPv4 to be part of the mask.
1281 for(int x=astartofs; x<16; ++x)
1282 netmask[x] = vIP[0].ip[x];
1296 // Normalize network according to netmask
1297 for(int x=0; x<16; ++x)
1298 network.ip[x] &= netmask[x];
1301 bool CSubNet::Match(const CNetAddr &addr) const
1303 if (!valid || !addr.IsValid())
1305 for(int x=0; x<16; ++x)
1306 if ((addr.ip[x] & netmask[x]) != network.ip[x])
1311 std::string CSubNet::ToString() const
1313 std::string strNetmask;
1314 if (network.IsIPv4())
1315 strNetmask = strprintf("%u.%u.%u.%u", netmask[12], netmask[13], netmask[14], netmask[15]);
1317 strNetmask = strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
1318 netmask[0] << 8 | netmask[1], netmask[2] << 8 | netmask[3],
1319 netmask[4] << 8 | netmask[5], netmask[6] << 8 | netmask[7],
1320 netmask[8] << 8 | netmask[9], netmask[10] << 8 | netmask[11],
1321 netmask[12] << 8 | netmask[13], netmask[14] << 8 | netmask[15]);
1322 return network.ToString() + "/" + strNetmask;
1325 bool CSubNet::IsValid() const
1330 bool operator==(const CSubNet& a, const CSubNet& b)
1332 return a.valid == b.valid && a.network == b.network && !memcmp(a.netmask, b.netmask, 16);
1335 bool operator!=(const CSubNet& a, const CSubNet& b)
1340 bool operator<(const CSubNet& a, const CSubNet& b)
1342 return (a.network < b.network || (a.network == b.network && memcmp(a.netmask, b.netmask, 16) < 0));
1346 std::string NetworkErrorString(int err)
1350 if(FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,
1351 NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
1352 buf, sizeof(buf), NULL))
1354 return strprintf("%s (%d)", buf, err);
1358 return strprintf("Unknown error (%d)", err);
1362 std::string NetworkErrorString(int err)
1365 const char *s = buf;
1367 /* Too bad there are two incompatible implementations of the
1368 * thread-safe strerror. */
1369 #ifdef STRERROR_R_CHAR_P /* GNU variant can return a pointer outside the passed buffer */
1370 s = strerror_r(err, buf, sizeof(buf));
1371 #else /* POSIX variant always returns message in buffer */
1372 if (strerror_r(err, buf, sizeof(buf)))
1375 return strprintf("%s (%d)", s, err);
1379 bool CloseSocket(SOCKET& hSocket)
1381 if (hSocket == INVALID_SOCKET)
1384 int ret = closesocket(hSocket);
1386 int ret = close(hSocket);
1388 hSocket = INVALID_SOCKET;
1389 return ret != SOCKET_ERROR;
1392 bool SetSocketNonBlocking(SOCKET& hSocket, bool fNonBlocking)
1397 if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR) {
1399 int fFlags = fcntl(hSocket, F_GETFL, 0);
1400 if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == SOCKET_ERROR) {
1402 CloseSocket(hSocket);
1408 if (ioctlsocket(hSocket, FIONBIO, &nZero) == SOCKET_ERROR) {
1410 int fFlags = fcntl(hSocket, F_GETFL, 0);
1411 if (fcntl(hSocket, F_SETFL, fFlags & ~O_NONBLOCK) == SOCKET_ERROR) {
1413 CloseSocket(hSocket);