708 lines
18 KiB
C++
708 lines
18 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2011 The Bitcoin developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file license.txt or http://www.opensource.org/licenses/mit-license.php.
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#define BSD_SOURCE
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#include <string.h>
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#include <errno.h>
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#include <stdarg.h>
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#include "netbase.h"
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#include "util.h"
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#ifndef WIN32
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#include <sys/fcntl.h>
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#endif
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using namespace std;
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string strprintf(const std::string &format, ...)
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{
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char buffer[50000];
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char* p = buffer;
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int limit = sizeof(buffer);
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int ret;
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loop
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{
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va_list arg_ptr;
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va_start(arg_ptr, format);
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ret = vsnprintf(p, limit, format.c_str(), arg_ptr);
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va_end(arg_ptr);
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if (ret >= 0 && ret < limit)
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break;
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if (p != buffer)
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delete[] p;
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limit *= 2;
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p = new char[limit];
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if (p == NULL)
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throw std::bad_alloc();
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}
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string str(p, p+ret);
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if (p != buffer)
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delete[] p;
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return str;
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}
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int nConnectTimeout = 5000;
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static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
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bool static LookupIntern(const char *pszName, std::vector<CIP>& vIP, int nMaxSolutions, bool fAllowLookup)
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{
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vIP.clear();
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struct addrinfo aiHint = {};
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aiHint.ai_socktype = SOCK_STREAM;
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aiHint.ai_protocol = IPPROTO_TCP;
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#ifdef WIN32
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# ifdef USE_IPV6
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aiHint.ai_family = AF_UNSPEC;
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aiHint.ai_flags = fAllowLookup ? 0 : AI_NUMERICHOST;
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# else
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aiHint.ai_family = AF_INET;
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aiHint.ai_flags = fAllowLookup ? 0 : AI_NUMERICHOST;
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# endif
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#else
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# ifdef USE_IPV6
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aiHint.ai_family = AF_UNSPEC;
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aiHint.ai_flags = AI_ADDRCONFIG | (fAllowLookup ? 0 : AI_NUMERICHOST);
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# else
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aiHint.ai_family = AF_INET;
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aiHint.ai_flags = AI_ADDRCONFIG | (fAllowLookup ? 0 : AI_NUMERICHOST);
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# endif
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#endif
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struct addrinfo *aiRes = NULL;
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int nErr = getaddrinfo(pszName, NULL, &aiHint, &aiRes);
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if (nErr)
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return false;
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struct addrinfo *aiTrav = aiRes;
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while (aiTrav != NULL && (nMaxSolutions == 0 || vIP.size() < nMaxSolutions))
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{
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if (aiTrav->ai_family == AF_INET)
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{
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assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in));
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vIP.push_back(CIP(((struct sockaddr_in*)(aiTrav->ai_addr))->sin_addr));
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}
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#ifdef USE_IPV6
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if (aiTrav->ai_family == AF_INET6)
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{
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assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in6));
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vIP.push_back(CIP(((struct sockaddr_in6*)(aiTrav->ai_addr))->sin6_addr));
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}
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#endif
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aiTrav = aiTrav->ai_next;
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}
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freeaddrinfo(aiRes);
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return (vIP.size() > 0);
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}
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bool LookupHost(const char *pszName, std::vector<CIP>& vIP, int nMaxSolutions, bool fAllowLookup)
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{
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if (pszName[0] == 0)
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return false;
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char psz[256];
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char *pszHost = psz;
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strncpy(psz, pszName, sizeof(psz)-1);
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psz[255] = 0;
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if (psz[0] == '[' && psz[strlen(psz)-1] == ']')
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{
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pszHost = psz+1;
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psz[strlen(psz)-1] = 0;
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}
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return LookupIntern(pszHost, vIP, nMaxSolutions, fAllowLookup);
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}
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bool LookupHostNumeric(const char *pszName, std::vector<CIP>& vIP, int nMaxSolutions)
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{
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return LookupHost(pszName, vIP, nMaxSolutions, false);
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}
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bool Lookup(const char *pszName, CIPPort& addr, int portDefault, bool fAllowLookup)
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{
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if (pszName[0] == 0)
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return false;
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int port = portDefault;
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char psz[256];
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char *pszHost = psz;
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strncpy(psz, pszName, sizeof(psz)-1);
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psz[255] = 0;
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char* pszColon = strrchr(psz+1,':');
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char *pszPortEnd = NULL;
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int portParsed = pszColon ? strtoul(pszColon+1, &pszPortEnd, 10) : 0;
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if (pszColon && pszPortEnd && pszPortEnd[0] == 0)
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{
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if (psz[0] == '[' && pszColon[-1] == ']')
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{
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pszHost = psz+1;
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pszColon[-1] = 0;
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}
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else
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pszColon[0] = 0;
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if (port >= 0 && port <= USHRT_MAX)
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port = portParsed;
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}
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else
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{
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if (psz[0] == '[' && psz[strlen(psz)-1] == ']')
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{
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pszHost = psz+1;
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psz[strlen(psz)-1] = 0;
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}
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}
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std::vector<CIP> vIP;
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bool fRet = LookupIntern(pszHost, vIP, 1, fAllowLookup);
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if (!fRet)
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return false;
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addr = CIPPort(vIP[0], port);
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return true;
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}
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bool LookupNumeric(const char *pszName, CIPPort& addr, int portDefault)
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{
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return Lookup(pszName, addr, portDefault, false);
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}
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bool CIPPort::ConnectSocket(SOCKET& hSocketRet, int nTimeout) const
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{
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hSocketRet = INVALID_SOCKET;
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SOCKET hSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (hSocket == INVALID_SOCKET)
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{
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// printf("Failed to create socket: %s\n", strerror(errno));
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return false;
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}
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#ifdef SO_NOSIGPIPE
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int set = 1;
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setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
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#endif
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struct sockaddr_in sockaddr;
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GetSockAddr(&sockaddr);
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#ifdef WIN32
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u_long fNonblock = 1;
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if (ioctlsocket(hSocket, FIONBIO, &fNonblock) == SOCKET_ERROR)
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#else
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int fFlags = fcntl(hSocket, F_GETFL, 0);
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if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == -1)
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#endif
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{
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// printf("Failed to set socket NONBLOCK\n");
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closesocket(hSocket);
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}
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if (connect(hSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR)
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{
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// WSAEINVAL is here because some legacy version of winsock uses it
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if (WSAGetLastError() == WSAEINPROGRESS || WSAGetLastError() == WSAEWOULDBLOCK || WSAGetLastError() == WSAEINVAL)
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{
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struct timeval timeout;
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timeout.tv_sec = nTimeout / 1000;
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timeout.tv_usec = (nTimeout % 1000) * 1000;
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fd_set fdset;
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FD_ZERO(&fdset);
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FD_SET(hSocket, &fdset);
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int nRet = select(hSocket + 1, NULL, &fdset, NULL, &timeout);
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if (nRet == 0)
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{
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// printf("connection timeout\n");
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closesocket(hSocket);
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return false;
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}
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if (nRet == SOCKET_ERROR)
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{
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// printf("select() for connection failed: %s\n",strerror(WSAGetLastError()));
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closesocket(hSocket);
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return false;
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}
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socklen_t nRetSize = sizeof(nRet);
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#ifdef WIN32
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if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, (char*)(&nRet), &nRetSize) == SOCKET_ERROR)
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#else
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if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, &nRet, &nRetSize) == SOCKET_ERROR)
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#endif
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{
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// printf("getsockopt() for connection failed: %s\n",strerror(WSAGetLastError()));
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closesocket(hSocket);
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return false;
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}
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if (nRet != 0)
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{
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// printf("connect() failed after select(): %s\n",strerror(nRet));
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closesocket(hSocket);
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return false;
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}
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}
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#ifdef WIN32
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else if (WSAGetLastError() != WSAEISCONN)
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#else
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else
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#endif
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{
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// printf("connect() failed: %i\n",WSAGetLastError());
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closesocket(hSocket);
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return false;
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}
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}
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// this isn't even strictly necessary
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// CNode::ConnectNode immediately turns the socket back to non-blocking
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// but we'll turn it back to blocking just in case
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#ifdef WIN32
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fNonblock = 0;
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if (ioctlsocket(hSocket, FIONBIO, &fNonblock) == SOCKET_ERROR)
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#else
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fFlags = fcntl(hSocket, F_GETFL, 0);
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if (fcntl(hSocket, F_SETFL, fFlags & !O_NONBLOCK) == SOCKET_ERROR)
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#endif
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{
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// printf("Failed to set socket blocking\n");
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closesocket(hSocket);
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return false;
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}
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hSocketRet = hSocket;
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return true;
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}
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void CIP::Init()
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{
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memset(ip, 0, 16);
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}
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void CIP::SetIP(const CIP& ipIn)
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{
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memcpy(ip, ipIn.ip, sizeof(ip));
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}
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CIP::CIP()
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{
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Init();
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}
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CIP::CIP(const struct in_addr& ipv4Addr)
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{
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memcpy(ip, pchIPv4, 12);
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memcpy(ip+12, &ipv4Addr, 4);
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}
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#ifdef USE_IPV6
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CIP::CIP(const struct in6_addr& ipv6Addr)
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{
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memcpy(ip, &ipv6Addr, 16);
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}
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#endif
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CIP::CIP(const char *pszIp, bool fAllowLookup)
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{
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Init();
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std::vector<CIP> vIP;
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if (LookupHost(pszIp, vIP, 1, fAllowLookup))
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*this = vIP[0];
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}
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CIP::CIP(const std::string &strIp, bool fAllowLookup)
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{
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Init();
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std::vector<CIP> vIP;
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if (LookupHost(strIp.c_str(), vIP, 1, fAllowLookup))
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*this = vIP[0];
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}
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int CIP::GetByte(int n) const
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{
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return ip[15-n];
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}
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bool CIP::IsIPv4() const
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{
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return (memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0);
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}
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bool CIP::IsRFC1918() const
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{
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return IsIPv4() && (
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GetByte(3) == 10 ||
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(GetByte(3) == 192 && GetByte(2) == 168) ||
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(GetByte(3) == 172 && (GetByte(2) >= 16 && GetByte(2) <= 31)));
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}
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bool CIP::IsRFC3927() const
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{
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return IsIPv4() && (GetByte(3) == 169 && GetByte(2) == 254);
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}
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bool CIP::IsRFC3849() const
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{
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return GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x0D && GetByte(12) == 0xB8;
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}
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bool CIP::IsRFC3964() const
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{
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return (GetByte(15) == 0x20 && GetByte(14) == 0x02);
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}
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bool CIP::IsRFC6052() const
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{
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static const unsigned char pchRFC6052[] = {0,0x64,0xFF,0x9B,0,0,0,0,0,0,0,0};
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return (memcmp(ip, pchRFC6052, sizeof(pchRFC6052)) == 0);
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}
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bool CIP::IsRFC4380() const
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{
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return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0 && GetByte(12) == 0);
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}
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bool CIP::IsRFC4862() const
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{
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static const unsigned char pchRFC4862[] = {0xFE,0x80,0,0,0,0,0,0};
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return (memcmp(ip, pchRFC4862, sizeof(pchRFC4862)) == 0);
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}
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bool CIP::IsRFC4193() const
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{
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return ((GetByte(15) & 0xFE) == 0xFC);
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}
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bool CIP::IsRFC6145() const
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{
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static const unsigned char pchRFC6145[] = {0,0,0,0,0,0,0,0,0xFF,0xFF,0,0};
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return (memcmp(ip, pchRFC6145, sizeof(pchRFC6145)) == 0);
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}
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bool CIP::IsRFC4843() const
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{
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return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && GetByte(12) & 0xF0 == 0x10);
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}
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bool CIP::IsLocal() const
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{
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// IPv4 loopback
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if (IsIPv4() && (GetByte(3) == 127 || GetByte(3) == 0))
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return true;
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// IPv6 loopback (::1/128)
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static const unsigned char pchLocal[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
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if (memcmp(ip, pchLocal, 16) == 0)
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return true;
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return false;
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}
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bool CIP::IsMulticast() const
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{
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return (IsIPv4() && (GetByte(3) & 0xF0) == 0xE0)
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|| (GetByte(15) == 0xFF);
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}
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bool CIP::IsValid() const
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{
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// Clean up 3-byte shifted addresses caused by garbage in size field
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// of addr messages from versions before 0.2.9 checksum.
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// Two consecutive addr messages look like this:
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// header20 vectorlen3 addr26 addr26 addr26 header20 vectorlen3 addr26 addr26 addr26...
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// so if the first length field is garbled, it reads the second batch
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// of addr misaligned by 3 bytes.
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if (memcmp(ip, pchIPv4+3, sizeof(pchIPv4)-3) == 0)
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return false;
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// unspecified IPv6 address (::/128)
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unsigned char ipNone[16] = {};
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if (memcmp(ip, ipNone, 16) == 0)
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return false;
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// documentation IPv6 address
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if (IsRFC3849())
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return false;
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if (IsIPv4())
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{
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// INADDR_NONE
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uint32_t ipNone = INADDR_NONE;
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if (memcmp(ip+12, &ipNone, 4) == 0)
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return false;
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// 0
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ipNone = 0;
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if (memcmp(ip+12, &ipNone, 4) == 0)
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return false;
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}
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return true;
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}
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bool CIP::IsRoutable() const
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{
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return IsValid() && !(IsRFC1918() || IsRFC3927() || IsRFC4862() || IsRFC4193() || IsRFC4843() || IsLocal());
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}
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std::string CIP::ToString() const
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{
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if (IsIPv4())
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return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));
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else
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return strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
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GetByte(15) << 8 | GetByte(14), GetByte(13) << 8 | GetByte(12),
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GetByte(11) << 8 | GetByte(10), GetByte(9) << 8 | GetByte(8),
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GetByte(7) << 8 | GetByte(6), GetByte(5) << 8 | GetByte(4),
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GetByte(3) << 8 | GetByte(2), GetByte(1) << 8 | GetByte(0));
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}
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bool operator==(const CIP& a, const CIP& b)
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{
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return (memcmp(a.ip, b.ip, 16) == 0);
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}
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bool operator!=(const CIP& a, const CIP& b)
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{
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return (memcmp(a.ip, b.ip, 16) != 0);
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}
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bool operator<(const CIP& a, const CIP& b)
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{
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return (memcmp(a.ip, b.ip, 16) < 0);
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}
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bool CIP::GetInAddr(struct in_addr* pipv4Addr) const
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{
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if (!IsIPv4())
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return false;
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memcpy(pipv4Addr, ip+12, 4);
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return true;
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}
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#ifdef USE_IPV6
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bool CIP::GetIn6Addr(struct in6_addr* pipv6Addr) const
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{
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memcpy(pipv6Addr, ip, 16);
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return true;
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}
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#endif
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// get canonical identifier of an address' group
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// no two connections will be attempted to addresses with the same group
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std::vector<unsigned char> CIP::GetGroup() const
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{
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std::vector<unsigned char> vchRet;
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int nClass = 0; // 0=IPv6, 1=IPv4, 255=unroutable
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int nStartByte = 0;
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int nBits = 16;
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// for unroutable addresses, each address is considered different
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if (!IsRoutable())
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{
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nClass = 255;
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nBits = 128;
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}
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// for IPv4 addresses, '1' + the 16 higher-order bits of the IP
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// includes mapped IPv4, SIIT translated IPv4, and the well-known prefix
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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 CIP::GetHash() const
|
|
{
|
|
if (IsIPv4())
|
|
{
|
|
// reconstruct ip in reversed-byte order
|
|
// (the original definition of the randomizer used network-order integers on little endian architecture)
|
|
int64 ip = GetByte(0) << 24 + GetByte(1) << 16 + GetByte(2) << 8 + GetByte(3);
|
|
return ip * 7789;
|
|
}
|
|
|
|
// for IPv6 addresses, use separate multipliers for each byte
|
|
// these numbers are from the hexadecimal expansion of 3/Pi:
|
|
static const int64 nByteMult[16] =
|
|
{0xF4764525, 0x75661FBE, 0xFA3B03BA, 0xEFCF4CA1, 0x4913E065, 0xDA655862, 0xFD7A1581, 0xCE19A812,
|
|
0x92B6A557, 0x6374BC50, 0x096DC65F, 0x0EBA5B2B, 0x7D2CE0AB, 0x09BE7ADE, 0x5CC350EF, 0xC618E6C7};
|
|
int64 nRet = 0;
|
|
for (int n=0; n<16; n++)
|
|
nRet += nByteMult[n]*GetByte(n);
|
|
return nRet;
|
|
}
|
|
|
|
void CIP::print() const
|
|
{
|
|
// printf("CIP(%s)\n", ToString().c_str());
|
|
}
|
|
|
|
void CIPPort::Init()
|
|
{
|
|
port = 0;
|
|
}
|
|
|
|
CIPPort::CIPPort()
|
|
{
|
|
Init();
|
|
}
|
|
|
|
CIPPort::CIPPort(const CIP& cip, unsigned short portIn) : CIP(cip), port(portIn)
|
|
{
|
|
}
|
|
|
|
CIPPort::CIPPort(const struct in_addr& ipv4Addr, unsigned short portIn) : CIP(ipv4Addr), port(portIn)
|
|
{
|
|
}
|
|
|
|
#ifdef USE_IPV6
|
|
CIPPort::CIPPort(const struct in6_addr& ipv6Addr, unsigned short portIn) : CIP(ipv6Addr), port(portIn)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
CIPPort::CIPPort(const struct sockaddr_in& addr) : CIP(addr.sin_addr), port(ntohs(addr.sin_port))
|
|
{
|
|
assert(addr.sin_family == AF_INET);
|
|
}
|
|
|
|
#ifdef USE_IPV6
|
|
CIPPort::CIPPort(const struct sockaddr_in6 &addr) : CIP(addr.sin6_addr), port(ntohs(addr.sin6_port))
|
|
{
|
|
assert(addr.sin6_family == AF_INET6);
|
|
}
|
|
#endif
|
|
|
|
CIPPort::CIPPort(const char *pszIpPort, bool fAllowLookup)
|
|
{
|
|
Init();
|
|
CIPPort ip;
|
|
if (Lookup(pszIpPort, ip, 0, fAllowLookup))
|
|
*this = ip;
|
|
}
|
|
|
|
CIPPort::CIPPort(const char *pszIp, int portIn, bool fAllowLookup)
|
|
{
|
|
std::vector<CIP> ip;
|
|
if (LookupHost(pszIp, ip, 1, fAllowLookup))
|
|
*this = CIPPort(ip[0], portIn);
|
|
}
|
|
|
|
CIPPort::CIPPort(const std::string &strIpPort, bool fAllowLookup)
|
|
{
|
|
Init();
|
|
CIPPort ip;
|
|
if (Lookup(strIpPort.c_str(), ip, 0, fAllowLookup))
|
|
*this = ip;
|
|
}
|
|
|
|
CIPPort::CIPPort(const std::string &strIp, int portIn, bool fAllowLookup)
|
|
{
|
|
std::vector<CIP> ip;
|
|
if (LookupHost(strIp.c_str(), ip, 1, fAllowLookup))
|
|
*this = CIPPort(ip[0], portIn);
|
|
}
|
|
|
|
unsigned short CIPPort::GetPort() const
|
|
{
|
|
return port;
|
|
}
|
|
|
|
bool operator==(const CIPPort& a, const CIPPort& b)
|
|
{
|
|
return (operator==((CIP)a, (CIP)b) && a.port == b.port);
|
|
}
|
|
|
|
bool operator!=(const CIPPort& a, const CIPPort& b)
|
|
{
|
|
return (operator!=((CIP)a, (CIP)b) || a.port != b.port);
|
|
}
|
|
|
|
bool operator<(const CIPPort& a, const CIPPort& b)
|
|
{
|
|
return (operator<((CIP)a, (CIP)b) || (operator==((CIP)a, (CIP)b) && (a.port < b.port)));
|
|
}
|
|
|
|
bool CIPPort::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);
|
|
}
|
|
|
|
#ifdef USE_IPV6
|
|
bool CIPPort::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);
|
|
}
|
|
#endif
|
|
|
|
std::vector<unsigned char> CIPPort::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 CIPPort::ToString() const
|
|
{
|
|
return CIP::ToString() + strprintf(":%i", port);
|
|
}
|
|
|
|
void CIPPort::print() const
|
|
{
|
|
// printf("CIPPort(%s)\n", ToString().c_str());
|
|
}
|
|
|
|
void CIPPort::SetPort(unsigned short portIn)
|
|
{
|
|
port = portIn;
|
|
}
|