diff options
Diffstat (limited to 'src/netbase.cpp')
| -rw-r--r-- | src/netbase.cpp | 1137 |
1 files changed, 295 insertions, 842 deletions
diff --git a/src/netbase.cpp b/src/netbase.cpp index af6d11f0e2..32557dd179 100644 --- a/src/netbase.cpp +++ b/src/netbase.cpp @@ -1,10 +1,10 @@ // Copyright (c) 2009-2010 Satoshi Nakamoto -// Copyright (c) 2009-2014 The Bitcoin developers -// Distributed under the MIT/X11 software license, see the accompanying +// Copyright (c) 2009-2016 The Bitcoin Core developers +// Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. #ifdef HAVE_CONFIG_H -#include "bitcoin-config.h" +#include "config/bitcoin-config.h" #endif #include "netbase.h" @@ -12,45 +12,52 @@ #include "hash.h" #include "sync.h" #include "uint256.h" +#include "random.h" #include "util.h" +#include "utilstrencodings.h" -#ifdef HAVE_GETADDRINFO_A -#include <netdb.h> -#endif +#include <atomic> #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() -#if !defined(HAVE_MSG_NOSIGNAL) && !defined(MSG_NOSIGNAL) +#if !defined(HAVE_MSG_NOSIGNAL) #define MSG_NOSIGNAL 0 #endif -using namespace std; - // Settings static proxyType proxyInfo[NET_MAX]; -static CService nameProxy; +static proxyType nameProxy; static CCriticalSection cs_proxyInfos; -int nConnectTimeout = 5000; -bool fNameLookup = false; +int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT; +bool fNameLookup = DEFAULT_NAME_LOOKUP; -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; +static std::atomic<bool> interruptSocks5Recv(false); 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") return NET_TOR; + 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 @@ -82,30 +89,9 @@ bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsign } } -#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; @@ -114,33 +100,8 @@ bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsign #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; @@ -156,7 +117,8 @@ bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsign 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)); + struct sockaddr_in6* s6 = (struct sockaddr_in6*) aiTrav->ai_addr; + vIP.push_back(CNetAddr(s6->sin6_addr, s6->sin6_scope_id)); } aiTrav = aiTrav->ai_next; @@ -180,6 +142,16 @@ bool LookupHost(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nM return LookupIntern(strHost.c_str(), vIP, nMaxSolutions, fAllowLookup); } +bool LookupHost(const char *pszName, CNetAddr& addr, bool fAllowLookup) +{ + std::vector<CNetAddr> vIP; + LookupHost(pszName, vIP, 1, fAllowLookup); + if(vIP.empty()) + return false; + addr = vIP.front(); + return true; +} + bool Lookup(const char *pszName, std::vector<CService>& vAddr, int portDefault, bool fAllowLookup, unsigned int nMaxSolutions) { if (pszName[0] == 0) @@ -208,112 +180,236 @@ bool Lookup(const char *pszName, CService& addr, int portDefault, bool fAllowLoo return true; } -bool LookupNumeric(const char *pszName, CService& addr, int portDefault) +CService LookupNumeric(const char *pszName, int portDefault) +{ + CService addr; + // "1.2:345" will fail to resolve the ip, but will still set the port. + // If the ip fails to resolve, re-init the result. + if(!Lookup(pszName, addr, portDefault, false)) + addr = CService(); + return addr; +} + +struct timeval MillisToTimeval(int64_t nTimeout) +{ + struct timeval timeout; + timeout.tv_sec = nTimeout / 1000; + timeout.tv_usec = (nTimeout % 1000) * 1000; + return timeout; +} + +enum class IntrRecvError { + OK, + Timeout, + Disconnected, + NetworkError, + Interrupted +}; + +/** + * 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 calling InterruptSocks5() + * + * @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. + */ +static IntrRecvError 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 IntrRecvError::Disconnected; + } else { // Other error or blocking + int nErr = WSAGetLastError(); + if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL) { + if (!IsSelectableSocket(hSocket)) { + return IntrRecvError::NetworkError; + } + 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 IntrRecvError::NetworkError; + } + } else { + return IntrRecvError::NetworkError; + } + } + if (interruptSocks5Recv) + return IntrRecvError::Interrupted; + curTime = GetTimeMillis(); + } + return len == 0 ? IntrRecvError::OK : IntrRecvError::Timeout; +} + +struct ProxyCredentials +{ + std::string username; + std::string password; +}; + +std::string Socks5ErrorString(int err) { - return Lookup(pszName, addr, portDefault, false); + switch(err) { + case 0x01: return "general failure"; + case 0x02: return "connection not allowed"; + case 0x03: return "network unreachable"; + case 0x04: return "host unreachable"; + case 0x05: return "connection refused"; + case 0x06: return "TTL expired"; + case 0x07: return "protocol error"; + case 0x08: return "address type not supported"; + default: return "unknown"; + } } -bool static Socks5(string strDest, int port, SOCKET& hSocket) +/** Connect using SOCKS5 (as described in RFC1928) */ +static bool Socks5(const std::string& strDest, int port, const ProxyCredentials *auth, SOCKET& hSocket) { - LogPrintf("SOCKS5 connecting %s\n", strDest); - if (strDest.size() > 255) - { + IntrRecvError recvr; + LogPrint(BCLog::NET, "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) - { + // Accepted authentication methods + std::vector<uint8_t> vSocks5Init; + vSocks5Init.push_back(0x05); + if (auth) { + vSocks5Init.push_back(0x02); // # METHODS + vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED + vSocks5Init.push_back(0x02); // X'02' USERNAME/PASSWORD (RFC1929) + } else { + vSocks5Init.push_back(0x01); // # METHODS + vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED + } + ssize_t ret = send(hSocket, (const char*)vSocks5Init.data(), vSocks5Init.size(), MSG_NOSIGNAL); + if (ret != (ssize_t)vSocks5Init.size()) { CloseSocket(hSocket); return error("Error sending to proxy"); } char pchRet1[2]; - if (recv(hSocket, pchRet1, 2, 0) != 2) - { + if ((recvr = InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) { CloseSocket(hSocket); - return error("Error reading proxy response"); + LogPrintf("Socks5() connect to %s:%d failed: InterruptibleRecv() timeout or other failure\n", strDest, port); + return false; } - if (pchRet1[0] != 0x05 || pchRet1[1] != 0x00) - { + if (pchRet1[0] != 0x05) { 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.c_str(), strSocks5.size(), MSG_NOSIGNAL); - if (ret != (ssize_t)strSocks5.size()) - { + if (pchRet1[1] == 0x02 && auth) { + // Perform username/password authentication (as described in RFC1929) + std::vector<uint8_t> vAuth; + vAuth.push_back(0x01); + if (auth->username.size() > 255 || auth->password.size() > 255) + return error("Proxy username or password too long"); + vAuth.push_back(auth->username.size()); + vAuth.insert(vAuth.end(), auth->username.begin(), auth->username.end()); + vAuth.push_back(auth->password.size()); + vAuth.insert(vAuth.end(), auth->password.begin(), auth->password.end()); + ret = send(hSocket, (const char*)vAuth.data(), vAuth.size(), MSG_NOSIGNAL); + if (ret != (ssize_t)vAuth.size()) { + CloseSocket(hSocket); + return error("Error sending authentication to proxy"); + } + LogPrint(BCLog::PROXY, "SOCKS5 sending proxy authentication %s:%s\n", auth->username, auth->password); + char pchRetA[2]; + if ((recvr = InterruptibleRecv(pchRetA, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) { + CloseSocket(hSocket); + return error("Error reading proxy authentication response"); + } + if (pchRetA[0] != 0x01 || pchRetA[1] != 0x00) { + CloseSocket(hSocket); + return error("Proxy authentication unsuccessful"); + } + } else if (pchRet1[1] == 0x00) { + // Perform no authentication + } else { + CloseSocket(hSocket); + return error("Proxy requested wrong authentication method %02x", pchRet1[1]); + } + std::vector<uint8_t> vSocks5; + vSocks5.push_back(0x05); // VER protocol version + vSocks5.push_back(0x01); // CMD CONNECT + vSocks5.push_back(0x00); // RSV Reserved + vSocks5.push_back(0x03); // ATYP DOMAINNAME + vSocks5.push_back(strDest.size()); // Length<=255 is checked at beginning of function + vSocks5.insert(vSocks5.end(), strDest.begin(), strDest.end()); + vSocks5.push_back((port >> 8) & 0xFF); + vSocks5.push_back((port >> 0) & 0xFF); + ret = send(hSocket, (const char*)vSocks5.data(), vSocks5.size(), MSG_NOSIGNAL); + if (ret != (ssize_t)vSocks5.size()) { CloseSocket(hSocket); return error("Error sending to proxy"); } char pchRet2[4]; - if (recv(hSocket, pchRet2, 4, 0) != 4) - { + if ((recvr = InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) { CloseSocket(hSocket); - return error("Error reading proxy response"); + if (recvr == IntrRecvError::Timeout) { + /* If a timeout happens here, this effectively means we timed out while connecting + * to the remote node. This is very common for Tor, so do not print an + * error message. */ + return false; + } else { + return error("Error while reading proxy response"); + } } - if (pchRet2[0] != 0x05) - { + if (pchRet2[0] != 0x05) { CloseSocket(hSocket); return error("Proxy failed to accept request"); } - if (pchRet2[1] != 0x00) - { + if (pchRet2[1] != 0x00) { + // Failures to connect to a peer that are not proxy errors 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"); - } + LogPrintf("Socks5() connect to %s:%d failed: %s\n", strDest, port, Socks5ErrorString(pchRet2[1])); + return false; } - if (pchRet2[2] != 0x00) - { + if (pchRet2[2] != 0x00) { CloseSocket(hSocket); return error("Error: malformed proxy response"); } char pchRet3[256]; switch (pchRet2[3]) { - case 0x01: ret = recv(hSocket, pchRet3, 4, 0) != 4; break; - case 0x04: ret = recv(hSocket, pchRet3, 16, 0) != 16; break; + case 0x01: recvr = InterruptibleRecv(pchRet3, 4, SOCKS5_RECV_TIMEOUT, hSocket); break; + case 0x04: recvr = InterruptibleRecv(pchRet3, 16, SOCKS5_RECV_TIMEOUT, hSocket); break; case 0x03: { - ret = recv(hSocket, pchRet3, 1, 0) != 1; - if (ret) { + recvr = InterruptibleRecv(pchRet3, 1, SOCKS5_RECV_TIMEOUT, hSocket); + if (recvr != IntrRecvError::OK) { CloseSocket(hSocket); return error("Error reading from proxy"); } int nRecv = pchRet3[0]; - ret = recv(hSocket, pchRet3, nRecv, 0) != nRecv; + recvr = InterruptibleRecv(pchRet3, nRecv, SOCKS5_RECV_TIMEOUT, hSocket); break; } default: CloseSocket(hSocket); return error("Error: malformed proxy response"); } - if (ret) - { + if (recvr != IntrRecvError::OK) { CloseSocket(hSocket); return error("Error reading from proxy"); } - if (recv(hSocket, pchRet3, 2, 0) != 2) - { + if ((recvr = InterruptibleRecv(pchRet3, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) { CloseSocket(hSocket); return error("Error reading from proxy"); } - LogPrintf("SOCKS5 connected %s\n", strDest); + LogPrint(BCLog::NET, "SOCKS5 connected %s\n", strDest); return true; } @@ -334,9 +430,13 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe #ifdef SO_NOSIGPIPE int set = 1; + // Different way of disabling SIGPIPE on BSD setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int)); #endif + //Disable Nagle's algorithm + SetSocketNoDelay(hSocket); + // Set to non-blocking if (!SetSocketNonBlocking(hSocket, true)) return error("ConnectSocketDirectly: Setting socket to non-blocking failed, error %s\n", NetworkErrorString(WSAGetLastError())); @@ -347,17 +447,14 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe // WSAEINVAL is here because some legacy version of winsock uses it if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL) { - struct timeval timeout; - timeout.tv_sec = nTimeout / 1000; - timeout.tv_usec = (nTimeout % 1000) * 1000; - + 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()); + LogPrint(BCLog::NET, "connection to %s timeout\n", addrConnect.ToString()); CloseSocket(hSocket); return false; } @@ -397,16 +494,11 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe } } - // This is required when using SOCKS5 proxy! - // CNode::ConnectNode turns the socket back to non-blocking. - if (!SetSocketNonBlocking(hSocket, false)) - return error("ConnectSocketDirectly: Setting socket to blocking failed, error %s\n", NetworkErrorString(WSAGetLastError())); - hSocketRet = hSocket; return true; } -bool SetProxy(enum Network net, CService addrProxy) { +bool SetProxy(enum Network net, const proxyType &addrProxy) { assert(net >= 0 && net < NET_MAX); if (!addrProxy.IsValid()) return false; @@ -424,7 +516,7 @@ bool GetProxy(enum Network net, proxyType &proxyInfoOut) { return true; } -bool SetNameProxy(CService addrProxy) { +bool SetNameProxy(const proxyType &addrProxy) { if (!addrProxy.IsValid()) return false; LOCK(cs_proxyInfos); @@ -432,7 +524,7 @@ bool SetNameProxy(CService addrProxy) { return true; } -bool GetNameProxy(CService &nameProxyOut) { +bool GetNameProxy(proxyType &nameProxyOut) { LOCK(cs_proxyInfos); if(!nameProxy.IsValid()) return false; @@ -448,764 +540,112 @@ bool HaveNameProxy() { bool IsProxy(const CNetAddr &addr) { LOCK(cs_proxyInfos); for (int i = 0; i < NET_MAX; i++) { - if (addr == (CNetAddr)proxyInfo[i]) + if (addr == (CNetAddr)proxyInfo[i].proxy) return true; } return false; } -bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout) +static bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int port, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed) { - 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)) + if (!ConnectSocketDirectly(proxy.proxy, hSocket, nTimeout)) { + if (outProxyConnectionFailed) + *outProxyConnectionFailed = true; 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)) + if (proxy.randomize_credentials) { + ProxyCredentials random_auth; + static std::atomic_int counter; + random_auth.username = random_auth.password = strprintf("%i", counter++); + if (!Socks5(strDest, (unsigned short)port, &random_auth, hSocket)) 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) + } else { + if (!Socks5(strDest, (unsigned short)port, 0, hSocket)) return false; } + hSocketRet = hSocket; 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 +bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed) { - if (!IsIPv4()) - return false; - memcpy(pipv4Addr, ip+12, 4); - return true; -} + proxyType proxy; + if (outProxyConnectionFailed) + *outProxyConnectionFailed = false; -bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const -{ - memcpy(pipv6Addr, ip, 16); - return true; + if (GetProxy(addrDest.GetNetwork(), proxy)) + return ConnectThroughProxy(proxy, addrDest.ToStringIP(), addrDest.GetPort(), hSocketRet, nTimeout, outProxyConnectionFailed); + else // no proxy needed (none set for target network) + return ConnectSocketDirectly(addrDest, hSocketRet, nTimeout); } -// 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 +bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest, int portDefault, int nTimeout, bool *outProxyConnectionFailed) { - 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; -} + std::string strDest; + int port = portDefault; -uint64_t CNetAddr::GetHash() const -{ - uint256 hash = Hash(&ip[0], &ip[16]); - uint64_t nRet; - memcpy(&nRet, &hash, sizeof(nRet)); - return nRet; -} + if (outProxyConnectionFailed) + *outProxyConnectionFailed = false; -void CNetAddr::print() const -{ - LogPrintf("CNetAddr(%s)\n", ToString()); -} + SplitHostPort(std::string(pszDest), port, strDest); -// 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(); -} + proxyType proxy; + GetNameProxy(proxy); -/** 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 + std::vector<CService> addrResolved; + if (Lookup(strDest.c_str(), addrResolved, port, fNameLookup && !HaveNameProxy(), 256)) { + if (addrResolved.size() > 0) { + addr = addrResolved[GetRand(addrResolved.size())]; + return ConnectSocket(addr, hSocketRet, nTimeout); } } -} -void CService::Init() -{ - port = 0; -} - -CService::CService() -{ - Init(); -} - -CService::CService(const CNetAddr& cip, unsigned short portIn) : CNetAddr(cip), port(portIn) -{ -} - -CService::CService(const struct in_addr& ipv4Addr, unsigned short portIn) : CNetAddr(ipv4Addr), port(portIn) -{ -} + addr = CService(); -CService::CService(const struct in6_addr& ipv6Addr, unsigned short portIn) : CNetAddr(ipv6Addr), port(portIn) -{ -} - -CService::CService(const struct sockaddr_in& addr) : CNetAddr(addr.sin_addr), port(ntohs(addr.sin_port)) -{ - assert(addr.sin_family == AF_INET); -} - -CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr), port(ntohs(addr.sin6_port)) -{ - assert(addr.sin6_family == AF_INET6); -} - -bool CService::SetSockAddr(const struct sockaddr *paddr) -{ - switch (paddr->sa_family) { - case AF_INET: - *this = CService(*(const struct sockaddr_in*)paddr); - return true; - case AF_INET6: - *this = CService(*(const struct sockaddr_in6*)paddr); - return true; - default: + if (!HaveNameProxy()) return false; - } + return ConnectThroughProxy(proxy, strDest, port, hSocketRet, nTimeout, outProxyConnectionFailed); } -CService::CService(const char *pszIpPort, bool fAllowLookup) -{ - Init(); - CService ip; - if (Lookup(pszIpPort, ip, 0, fAllowLookup)) - *this = ip; -} - -CService::CService(const char *pszIpPort, int portDefault, bool fAllowLookup) -{ - Init(); - CService ip; - if (Lookup(pszIpPort, ip, portDefault, fAllowLookup)) - *this = ip; -} - -CService::CService(const std::string &strIpPort, bool fAllowLookup) -{ - Init(); - CService ip; - if (Lookup(strIpPort.c_str(), ip, 0, fAllowLookup)) - *this = ip; -} - -CService::CService(const std::string &strIpPort, int portDefault, bool fAllowLookup) -{ - Init(); - CService ip; - if (Lookup(strIpPort.c_str(), ip, portDefault, fAllowLookup)) - *this = ip; -} - -unsigned short CService::GetPort() const -{ - return port; -} - -bool operator==(const CService& a, const CService& b) -{ - return (CNetAddr)a == (CNetAddr)b && a.port == b.port; -} - -bool operator!=(const CService& a, const CService& b) -{ - return (CNetAddr)a != (CNetAddr)b || a.port != b.port; -} - -bool operator<(const CService& a, const CService& b) -{ - return (CNetAddr)a < (CNetAddr)b || ((CNetAddr)a == (CNetAddr)b && a.port < b.port); -} - -bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const -{ - if (IsIPv4()) { - if (*addrlen < (socklen_t)sizeof(struct sockaddr_in)) - return false; - *addrlen = sizeof(struct sockaddr_in); - struct sockaddr_in *paddrin = (struct sockaddr_in*)paddr; - memset(paddrin, 0, *addrlen); - if (!GetInAddr(&paddrin->sin_addr)) - return false; - paddrin->sin_family = AF_INET; - paddrin->sin_port = htons(port); - return true; - } - if (IsIPv6()) { - if (*addrlen < (socklen_t)sizeof(struct sockaddr_in6)) - return false; - *addrlen = sizeof(struct sockaddr_in6); - struct sockaddr_in6 *paddrin6 = (struct sockaddr_in6*)paddr; - memset(paddrin6, 0, *addrlen); - if (!GetIn6Addr(&paddrin6->sin6_addr)) - return false; - paddrin6->sin6_family = AF_INET6; - paddrin6->sin6_port = htons(port); - return true; - } - return false; -} - -std::vector<unsigned char> CService::GetKey() const -{ - std::vector<unsigned char> vKey; - vKey.resize(18); - memcpy(&vKey[0], ip, 16); - vKey[16] = port / 0x100; - vKey[17] = port & 0x0FF; - return vKey; -} - -std::string CService::ToStringPort() const -{ - return strprintf("%u", port); -} - -std::string CService::ToStringIPPort() const -{ - if (IsIPv4() || IsTor()) { - return ToStringIP() + ":" + ToStringPort(); - } else { - return "[" + ToStringIP() + "]:" + ToStringPort(); - } -} - -std::string CService::ToString() const -{ - return ToStringIPPort(); -} - -void CService::print() const -{ - LogPrintf("CService(%s)\n", ToString()); -} - -void CService::SetPort(unsigned short portIn) -{ - port = portIn; -} - -CSubNet::CSubNet(): - valid(false) -{ - memset(netmask, 0, sizeof(netmask)); -} - -CSubNet::CSubNet(const std::string &strSubnet, bool fAllowLookup) +bool LookupSubNet(const char* pszName, CSubNet& ret) { + std::string strSubnet(pszName); size_t slash = strSubnet.find_last_of('/'); std::vector<CNetAddr> vIP; - valid = true; - // Default to /32 (IPv4) or /128 (IPv6), i.e. match single address - memset(netmask, 255, sizeof(netmask)); - std::string strAddress = strSubnet.substr(0, slash); - if (LookupHost(strAddress.c_str(), vIP, 1, fAllowLookup)) + if (LookupHost(strAddress.c_str(), vIP, 1, false)) { - network = vIP[0]; + CNetAddr network = vIP[0]; if (slash != strSubnet.npos) { std::string strNetmask = strSubnet.substr(slash + 1); int32_t n; // IPv4 addresses start at offset 12, and first 12 bytes must match, so just offset n - int noffset = network.IsIPv4() ? (12 * 8) : 0; - if (ParseInt32(strNetmask, &n)) // If valid number, assume /24 symtex - { - if(n >= 0 && n <= (128 - noffset)) // Only valid if in range of bits of address - { - n += noffset; - // Clear bits [n..127] - for (; n < 128; ++n) - netmask[n>>3] &= ~(1<<(n&7)); - } - else - { - valid = false; - } + if (ParseInt32(strNetmask, &n)) { // If valid number, assume /24 syntax + ret = CSubNet(network, n); + return ret.IsValid(); } else // If not a valid number, try full netmask syntax { - if (LookupHost(strNetmask.c_str(), vIP, 1, false)) // Never allow lookup for netmask - { - // Remember: GetByte returns bytes in reversed order - // Copy only the *last* four bytes in case of IPv4, the rest of the mask should stay 1's as - // we don't want pchIPv4 to be part of the mask. - int asize = network.IsIPv4() ? 4 : 16; - for(int x=0; x<asize; ++x) - netmask[15-x] = vIP[0].GetByte(x); - } - else - { - valid = false; + // Never allow lookup for netmask + if (LookupHost(strNetmask.c_str(), vIP, 1, false)) { + ret = CSubNet(network, vIP[0]); + return ret.IsValid(); } } } + else + { + ret = CSubNet(network); + return ret.IsValid(); + } } - else - { - valid = false; - } -} - -bool CSubNet::Match(const CNetAddr &addr) const -{ - if (!valid || !addr.IsValid()) - return false; - for(int x=0; x<16; ++x) - if ((addr.GetByte(x) & netmask[15-x]) != network.GetByte(x)) - return false; - return true; -} - -std::string CSubNet::ToString() const -{ - std::string strNetmask; - if (network.IsIPv4()) - strNetmask = strprintf("%u.%u.%u.%u", netmask[12], netmask[13], netmask[14], netmask[15]); - else - strNetmask = strprintf("%x:%x:%x:%x:%x:%x:%x:%x", - netmask[0] << 8 | netmask[1], netmask[2] << 8 | netmask[3], - netmask[4] << 8 | netmask[5], netmask[6] << 8 | netmask[7], - netmask[8] << 8 | netmask[9], netmask[10] << 8 | netmask[11], - netmask[12] << 8 | netmask[13], netmask[14] << 8 | netmask[15]); - return network.ToString() + "/" + strNetmask; -} - -bool CSubNet::IsValid() const -{ - return valid; -} - -bool operator==(const CSubNet& a, const CSubNet& b) -{ - return a.valid == b.valid && a.network == b.network && !memcmp(a.netmask, b.netmask, 16); -} - -bool operator!=(const CSubNet& a, const CSubNet& b) -{ - return !(a==b); + return false; } #ifdef WIN32 @@ -1228,13 +668,14 @@ std::string NetworkErrorString(int err) std::string NetworkErrorString(int err) { char buf[256]; - const char *s = buf; buf[0] = 0; /* Too bad there are two incompatible implementations of the * thread-safe strerror. */ + const char *s; #ifdef STRERROR_R_CHAR_P /* GNU variant can return a pointer outside the passed buffer */ s = strerror_r(err, buf, sizeof(buf)); #else /* POSIX variant always returns message in buffer */ + s = buf; if (strerror_r(err, buf, sizeof(buf))) buf[0] = 0; #endif @@ -1283,3 +724,15 @@ bool SetSocketNonBlocking(SOCKET& hSocket, bool fNonBlocking) return true; } + +bool SetSocketNoDelay(SOCKET& hSocket) +{ + int set = 1; + int rc = setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&set, sizeof(int)); + return rc == 0; +} + +void InterruptSocks5(bool interrupt) +{ + interruptSocks5Recv = interrupt; +} |