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Diffstat (limited to 'src/netbase.cpp')
| -rw-r--r-- | src/netbase.cpp | 715 |
1 files changed, 715 insertions, 0 deletions
diff --git a/src/netbase.cpp b/src/netbase.cpp new file mode 100644 index 0000000000..2c4df7faf8 --- /dev/null +++ b/src/netbase.cpp @@ -0,0 +1,715 @@ +// Copyright (c) 2009-2010 Satoshi Nakamoto +// Copyright (c) 2011 The Bitcoin developers +// Distributed under the MIT/X11 software license, see the accompanying +// file license.txt or http://www.opensource.org/licenses/mit-license.php. + +#include "netbase.h" +#include "util.h" + +#ifndef WIN32 +#include <sys/fcntl.h> +#endif + +#include "strlcpy.h" + +using namespace std; + +// Settings +int fUseProxy = false; +CService addrProxy("127.0.0.1",9050); +int nConnectTimeout = 5000; + + +static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff }; + +bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, int nMaxSolutions, bool fAllowLookup) +{ + vIP.clear(); + struct addrinfo aiHint = {}; + aiHint.ai_socktype = SOCK_STREAM; + aiHint.ai_protocol = IPPROTO_TCP; +#ifdef WIN32 +# ifdef USE_IPV6 + aiHint.ai_family = AF_UNSPEC; + aiHint.ai_flags = fAllowLookup ? 0 : AI_NUMERICHOST; +# else + aiHint.ai_family = AF_INET; + aiHint.ai_flags = fAllowLookup ? 0 : AI_NUMERICHOST; +# endif +#else +# ifdef USE_IPV6 + aiHint.ai_family = AF_UNSPEC; + aiHint.ai_flags = AI_ADDRCONFIG | (fAllowLookup ? 0 : AI_NUMERICHOST); +# else + aiHint.ai_family = AF_INET; + aiHint.ai_flags = AI_ADDRCONFIG | (fAllowLookup ? 0 : AI_NUMERICHOST); +# endif +#endif + struct addrinfo *aiRes = NULL; + int nErr = getaddrinfo(pszName, NULL, &aiHint, &aiRes); + if (nErr) + return false; + + struct addrinfo *aiTrav = aiRes; + while (aiTrav != NULL && (nMaxSolutions == 0 || vIP.size() < nMaxSolutions)) + { + if (aiTrav->ai_family == AF_INET) + { + assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in)); + vIP.push_back(CNetAddr(((struct sockaddr_in*)(aiTrav->ai_addr))->sin_addr)); + } + +#ifdef USE_IPV6 + 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)); + } +#endif + + aiTrav = aiTrav->ai_next; + } + + freeaddrinfo(aiRes); + + return (vIP.size() > 0); +} + +bool LookupHost(const char *pszName, std::vector<CNetAddr>& vIP, int nMaxSolutions, bool fAllowLookup) +{ + if (pszName[0] == 0) + return false; + char psz[256]; + char *pszHost = psz; + strlcpy(psz, pszName, sizeof(psz)); + if (psz[0] == '[' && psz[strlen(psz)-1] == ']') + { + pszHost = psz+1; + psz[strlen(psz)-1] = 0; + } + + return LookupIntern(pszHost, vIP, nMaxSolutions, fAllowLookup); +} + +bool LookupHostNumeric(const char *pszName, std::vector<CNetAddr>& vIP, int nMaxSolutions) +{ + return LookupHost(pszName, vIP, nMaxSolutions, false); +} + +bool Lookup(const char *pszName, CService& addr, int portDefault, bool fAllowLookup) +{ + if (pszName[0] == 0) + return false; + int port = portDefault; + char psz[256]; + char *pszHost = psz; + strlcpy(psz, pszName, sizeof(psz)); + char* pszColon = strrchr(psz+1,':'); + char *pszPortEnd = NULL; + int portParsed = pszColon ? strtoul(pszColon+1, &pszPortEnd, 10) : 0; + if (pszColon && pszPortEnd && pszPortEnd[0] == 0) + { + if (psz[0] == '[' && pszColon[-1] == ']') + { + pszHost = psz+1; + pszColon[-1] = 0; + } + else + pszColon[0] = 0; + if (port >= 0 && port <= USHRT_MAX) + port = portParsed; + } + else + { + if (psz[0] == '[' && psz[strlen(psz)-1] == ']') + { + pszHost = psz+1; + psz[strlen(psz)-1] = 0; + } + + } + + std::vector<CNetAddr> vIP; + bool fRet = LookupIntern(pszHost, vIP, 1, fAllowLookup); + if (!fRet) + return false; + addr = CService(vIP[0], port); + return true; +} + +bool LookupNumeric(const char *pszName, CService& addr, int portDefault) +{ + return Lookup(pszName, addr, portDefault, false); +} + +bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout) +{ + hSocketRet = INVALID_SOCKET; + + SOCKET hSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); + if (hSocket == INVALID_SOCKET) + return false; +#ifdef SO_NOSIGPIPE + int set = 1; + setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int)); +#endif + + bool fProxy = (fUseProxy && addrDest.IsRoutable()); + struct sockaddr_in sockaddr; + if (fProxy) + addrProxy.GetSockAddr(&sockaddr); + else + addrDest.GetSockAddr(&sockaddr); + +#ifdef WIN32 + u_long fNonblock = 1; + if (ioctlsocket(hSocket, FIONBIO, &fNonblock) == SOCKET_ERROR) +#else + int fFlags = fcntl(hSocket, F_GETFL, 0); + if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == -1) +#endif + { + closesocket(hSocket); + return false; + } + + + if (connect(hSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR) + { + // WSAEINVAL is here because some legacy version of winsock uses it + if (WSAGetLastError() == WSAEINPROGRESS || WSAGetLastError() == WSAEWOULDBLOCK || WSAGetLastError() == WSAEINVAL) + { + struct timeval timeout; + timeout.tv_sec = nTimeout / 1000; + timeout.tv_usec = (nTimeout % 1000) * 1000; + + fd_set fdset; + FD_ZERO(&fdset); + FD_SET(hSocket, &fdset); + int nRet = select(hSocket + 1, NULL, &fdset, NULL, &timeout); + if (nRet == 0) + { + printf("connection timeout\n"); + closesocket(hSocket); + return false; + } + if (nRet == SOCKET_ERROR) + { + printf("select() for connection failed: %i\n",WSAGetLastError()); + closesocket(hSocket); + return false; + } + socklen_t nRetSize = sizeof(nRet); +#ifdef WIN32 + if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, (char*)(&nRet), &nRetSize) == SOCKET_ERROR) +#else + if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, &nRet, &nRetSize) == SOCKET_ERROR) +#endif + { + printf("getsockopt() for connection failed: %i\n",WSAGetLastError()); + closesocket(hSocket); + return false; + } + if (nRet != 0) + { + printf("connect() failed after select(): %s\n",strerror(nRet)); + closesocket(hSocket); + return false; + } + } +#ifdef WIN32 + else if (WSAGetLastError() != WSAEISCONN) +#else + else +#endif + { + printf("connect() failed: %i\n",WSAGetLastError()); + closesocket(hSocket); + return false; + } + } + + // this isn't even strictly necessary + // CNode::ConnectNode immediately turns the socket back to non-blocking + // but we'll turn it back to blocking just in case +#ifdef WIN32 + fNonblock = 0; + if (ioctlsocket(hSocket, FIONBIO, &fNonblock) == SOCKET_ERROR) +#else + fFlags = fcntl(hSocket, F_GETFL, 0); + if (fcntl(hSocket, F_SETFL, fFlags & !O_NONBLOCK) == SOCKET_ERROR) +#endif + { + closesocket(hSocket); + return false; + } + + if (fProxy) + { + printf("proxy connecting %s\n", addrDest.ToString().c_str()); + char pszSocks4IP[] = "\4\1\0\0\0\0\0\0user"; + struct sockaddr_in addr; + addrDest.GetSockAddr(&addr); + memcpy(pszSocks4IP + 2, &addr.sin_port, 2); + memcpy(pszSocks4IP + 4, &addr.sin_addr, 4); + char* pszSocks4 = pszSocks4IP; + int nSize = sizeof(pszSocks4IP); + + int ret = send(hSocket, pszSocks4, nSize, MSG_NOSIGNAL); + if (ret != nSize) + { + closesocket(hSocket); + return error("Error sending to proxy"); + } + char pchRet[8]; + if (recv(hSocket, pchRet, 8, 0) != 8) + { + closesocket(hSocket); + return error("Error reading proxy response"); + } + if (pchRet[1] != 0x5a) + { + closesocket(hSocket); + if (pchRet[1] != 0x5b) + printf("ERROR: Proxy returned error %d\n", pchRet[1]); + return false; + } + printf("proxy connected %s\n", addrDest.ToString().c_str()); + } + + hSocketRet = hSocket; + return true; +} + +void CNetAddr::Init() +{ + memset(ip, 0, 16); +} + +void CNetAddr::SetIP(const CNetAddr& ipIn) +{ + memcpy(ip, ipIn.ip, sizeof(ip)); +} + +CNetAddr::CNetAddr() +{ + Init(); +} + +CNetAddr::CNetAddr(const struct in_addr& ipv4Addr) +{ + memcpy(ip, pchIPv4, 12); + memcpy(ip+12, &ipv4Addr, 4); +} + +#ifdef USE_IPV6 +CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr) +{ + memcpy(ip, &ipv6Addr, 16); +} +#endif + +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]; +} + +int CNetAddr::GetByte(int n) const +{ + return ip[15-n]; +} + +bool CNetAddr::IsIPv4() const +{ + return (memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0); +} + +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::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 +{ + // Clean up 3-byte shifted addresses caused by garbage in size field + // of addr messages from versions before 0.2.9 checksum. + // Two consecutive addr messages look like this: + // header20 vectorlen3 addr26 addr26 addr26 header20 vectorlen3 addr26 addr26 addr26... + // so if the first length field is garbled, it reads the second batch + // of addr misaligned by 3 bytes. + if (memcmp(ip, pchIPv4+3, sizeof(pchIPv4)-3) == 0) + return false; + + // unspecified IPv6 address (::/128) + unsigned char ipNone[16] = {}; + if (memcmp(ip, ipNone, 16) == 0) + return false; + + // documentation IPv6 address + if (IsRFC3849()) + return false; + + if (IsIPv4()) + { + // INADDR_NONE + uint32_t ipNone = INADDR_NONE; + if (memcmp(ip+12, &ipNone, 4) == 0) + return false; + + // 0 + ipNone = 0; + if (memcmp(ip+12, &ipNone, 4) == 0) + return false; + } + + return true; +} + +bool CNetAddr::IsRoutable() const +{ + return IsValid() && !(IsRFC1918() || IsRFC3927() || IsRFC4862() || IsRFC4193() || IsRFC4843() || IsLocal()); +} + +std::string CNetAddr::ToStringIP() const +{ + if (IsIPv4()) + return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0)); + else + return strprintf("%x:%x:%x:%x:%x:%x:%x:%x", + GetByte(15) << 8 | GetByte(14), GetByte(13) << 8 | GetByte(12), + GetByte(11) << 8 | GetByte(10), GetByte(9) << 8 | GetByte(8), + GetByte(7) << 8 | GetByte(6), GetByte(5) << 8 | GetByte(4), + GetByte(3) << 8 | GetByte(2), GetByte(1) << 8 | GetByte(0)); +} + +std::string CNetAddr::ToString() const +{ + return ToStringIP(); +} + +bool operator==(const CNetAddr& a, const CNetAddr& b) +{ + return (memcmp(a.ip, b.ip, 16) == 0); +} + +bool operator!=(const CNetAddr& a, const CNetAddr& b) +{ + return (memcmp(a.ip, b.ip, 16) != 0); +} + +bool operator<(const CNetAddr& a, const CNetAddr& b) +{ + return (memcmp(a.ip, b.ip, 16) < 0); +} + +bool CNetAddr::GetInAddr(struct in_addr* pipv4Addr) const +{ + if (!IsIPv4()) + return false; + memcpy(pipv4Addr, ip+12, 4); + return true; +} + +#ifdef USE_IPV6 +bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const +{ + memcpy(pipv6Addr, ip, 16); + return true; +} +#endif + +// get canonical identifier of an address' group +// no two connections will be attempted to addresses with the same group +std::vector<unsigned char> CNetAddr::GetGroup() const +{ + std::vector<unsigned char> vchRet; + int nClass = 0; // 0=IPv6, 1=IPv4, 255=unroutable + int nStartByte = 0; + int nBits = 16; + + // for unroutable addresses, each address is considered different + if (!IsRoutable()) + { + nClass = 255; + nBits = 128; + } + // 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 = 1; + nStartByte = 12; + } + // for 6to4 tunneled addresses, use the encapsulated IPv4 address + else if (IsRFC3964()) + { + nClass = 1; + nStartByte = 2; + } + // for Teredo-tunneled IPv6 addresses, use the encapsulated IPv4 address + else if (IsRFC4380()) + { + vchRet.push_back(1); + vchRet.push_back(GetByte(3) ^ 0xFF); + vchRet.push_back(GetByte(2) ^ 0xFF); + return vchRet; + } + // for he.net, use /36 groups + else if (GetByte(15) == 0x20 && GetByte(14) == 0x11 && 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; +} + +int64 CNetAddr::GetHash() const +{ + uint256 hash = Hash(&ip[0], &ip[16]); + int64 nRet; + memcpy(&nRet, &hash, sizeof(nRet)); + return nRet; +} + +void CNetAddr::print() const +{ + printf("CNetAddr(%s)\n", ToString().c_str()); +} + +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) +{ +} + +#ifdef USE_IPV6 +CService::CService(const struct in6_addr& ipv6Addr, unsigned short portIn) : CNetAddr(ipv6Addr), port(portIn) +{ +} +#endif + +CService::CService(const struct sockaddr_in& addr) : CNetAddr(addr.sin_addr), port(ntohs(addr.sin_port)) +{ + assert(addr.sin_family == AF_INET); +} + +#ifdef USE_IPV6 +CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr), port(ntohs(addr.sin6_port)) +{ + assert(addr.sin6_family == AF_INET6); +} +#endif + +CService::CService(const char *pszIpPort, bool fAllowLookup) +{ + Init(); + CService ip; + if (Lookup(pszIpPort, ip, 0, fAllowLookup)) + *this = ip; +} + +CService::CService(const char *pszIp, int portIn, bool fAllowLookup) +{ + std::vector<CNetAddr> ip; + if (LookupHost(pszIp, ip, 1, fAllowLookup)) + *this = CService(ip[0], portIn); +} + +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 &strIp, int portIn, bool fAllowLookup) +{ + std::vector<CNetAddr> ip; + if (LookupHost(strIp.c_str(), ip, 1, fAllowLookup)) + *this = CService(ip[0], portIn); +} + +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_in* paddr) const +{ + if (!IsIPv4()) + return false; + memset(paddr, 0, sizeof(struct sockaddr_in)); + if (!GetInAddr(&paddr->sin_addr)) + return false; + paddr->sin_family = AF_INET; + paddr->sin_port = htons(port); + return true; +} + +#ifdef USE_IPV6 +bool CService::GetSockAddr6(struct sockaddr_in6* paddr) const +{ + memset(paddr, 0, sizeof(struct sockaddr_in6)); + if (!GetIn6Addr(&paddr->sin6_addr)) + return false; + paddr->sin6_family = AF_INET6; + paddr->sin6_port = htons(port); + return true; +} +#endif + +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(":%i", port); +} + +std::string CService::ToStringIPPort() const +{ + return ToStringIP() + ToStringPort(); +} + +std::string CService::ToString() const +{ + return ToStringIPPort(); +} + +void CService::print() const +{ + printf("CService(%s)\n", ToString().c_str()); +} + +void CService::SetPort(unsigned short portIn) +{ + port = portIn; +} |