735 lines
24 KiB
C++
735 lines
24 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2016 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifdef HAVE_CONFIG_H
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#include "config/bitcoin-config.h"
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#endif
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#include "netbase.h"
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#include "hash.h"
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#include "sync.h"
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#include "uint256.h"
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#include "random.h"
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#include "util.h"
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#include "utilstrencodings.h"
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#include <atomic>
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#ifndef WIN32
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#include <fcntl.h>
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#endif
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#include <boost/algorithm/string/case_conv.hpp> // for to_lower()
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#include <boost/algorithm/string/predicate.hpp> // for startswith() and endswith()
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#if !defined(HAVE_MSG_NOSIGNAL) && !defined(MSG_NOSIGNAL)
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#define MSG_NOSIGNAL 0
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#endif
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// Settings
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static proxyType proxyInfo[NET_MAX];
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static proxyType nameProxy;
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static CCriticalSection cs_proxyInfos;
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int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
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bool fNameLookup = DEFAULT_NAME_LOOKUP;
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// Need ample time for negotiation for very slow proxies such as Tor (milliseconds)
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static const int SOCKS5_RECV_TIMEOUT = 20 * 1000;
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static std::atomic<bool> interruptSocks5Recv(false);
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enum Network ParseNetwork(std::string net) {
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boost::to_lower(net);
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if (net == "ipv4") return NET_IPV4;
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if (net == "ipv6") return NET_IPV6;
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if (net == "tor" || net == "onion") return NET_TOR;
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return NET_UNROUTABLE;
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}
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std::string GetNetworkName(enum Network net) {
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switch(net)
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{
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case NET_IPV4: return "ipv4";
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case NET_IPV6: return "ipv6";
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case NET_TOR: return "onion";
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default: return "";
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}
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}
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void SplitHostPort(std::string in, int &portOut, std::string &hostOut) {
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size_t colon = in.find_last_of(':');
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// if a : is found, and it either follows a [...], or no other : is in the string, treat it as port separator
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bool fHaveColon = colon != in.npos;
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bool fBracketed = fHaveColon && (in[0]=='[' && in[colon-1]==']'); // if there is a colon, and in[0]=='[', colon is not 0, so in[colon-1] is safe
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bool fMultiColon = fHaveColon && (in.find_last_of(':',colon-1) != in.npos);
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if (fHaveColon && (colon==0 || fBracketed || !fMultiColon)) {
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int32_t n;
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if (ParseInt32(in.substr(colon + 1), &n) && n > 0 && n < 0x10000) {
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in = in.substr(0, colon);
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portOut = n;
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}
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}
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if (in.size()>0 && in[0] == '[' && in[in.size()-1] == ']')
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hostOut = in.substr(1, in.size()-2);
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else
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hostOut = in;
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}
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bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
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{
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vIP.clear();
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{
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CNetAddr addr;
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if (addr.SetSpecial(std::string(pszName))) {
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vIP.push_back(addr);
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return true;
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}
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}
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struct addrinfo aiHint;
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memset(&aiHint, 0, sizeof(struct addrinfo));
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aiHint.ai_socktype = SOCK_STREAM;
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aiHint.ai_protocol = IPPROTO_TCP;
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aiHint.ai_family = AF_UNSPEC;
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#ifdef WIN32
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aiHint.ai_flags = fAllowLookup ? 0 : AI_NUMERICHOST;
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#else
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aiHint.ai_flags = fAllowLookup ? AI_ADDRCONFIG : AI_NUMERICHOST;
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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(CNetAddr(((struct sockaddr_in*)(aiTrav->ai_addr))->sin_addr));
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}
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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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struct sockaddr_in6* s6 = (struct sockaddr_in6*) aiTrav->ai_addr;
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vIP.push_back(CNetAddr(s6->sin6_addr, s6->sin6_scope_id));
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}
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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<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
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{
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std::string strHost(pszName);
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if (strHost.empty())
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return false;
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if (boost::algorithm::starts_with(strHost, "[") && boost::algorithm::ends_with(strHost, "]"))
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{
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strHost = strHost.substr(1, strHost.size() - 2);
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}
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return LookupIntern(strHost.c_str(), vIP, nMaxSolutions, fAllowLookup);
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}
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bool LookupHost(const char *pszName, CNetAddr& addr, bool fAllowLookup)
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{
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std::vector<CNetAddr> vIP;
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LookupHost(pszName, vIP, 1, fAllowLookup);
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if(vIP.empty())
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return false;
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addr = vIP.front();
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return true;
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}
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bool Lookup(const char *pszName, std::vector<CService>& vAddr, int portDefault, bool fAllowLookup, unsigned int nMaxSolutions)
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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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std::string hostname = "";
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SplitHostPort(std::string(pszName), port, hostname);
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std::vector<CNetAddr> vIP;
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bool fRet = LookupIntern(hostname.c_str(), vIP, nMaxSolutions, fAllowLookup);
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if (!fRet)
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return false;
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vAddr.resize(vIP.size());
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for (unsigned int i = 0; i < vIP.size(); i++)
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vAddr[i] = CService(vIP[i], port);
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return true;
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}
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bool Lookup(const char *pszName, CService& addr, int portDefault, bool fAllowLookup)
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{
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std::vector<CService> vService;
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bool fRet = Lookup(pszName, vService, portDefault, fAllowLookup, 1);
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if (!fRet)
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return false;
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addr = vService[0];
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return true;
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}
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CService LookupNumeric(const char *pszName, int portDefault)
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{
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CService addr;
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// "1.2:345" will fail to resolve the ip, but will still set the port.
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// If the ip fails to resolve, re-init the result.
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if(!Lookup(pszName, addr, portDefault, false))
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addr = CService();
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return addr;
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}
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struct timeval MillisToTimeval(int64_t nTimeout)
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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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return timeout;
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}
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enum class IntrRecvError {
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OK,
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Timeout,
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Disconnected,
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NetworkError,
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Interrupted
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};
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/**
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* Read bytes from socket. This will either read the full number of bytes requested
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* or return False on error or timeout.
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* This function can be interrupted by calling InterruptSocks5()
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*
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* @param data Buffer to receive into
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* @param len Length of data to receive
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* @param timeout Timeout in milliseconds for receive operation
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*
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* @note This function requires that hSocket is in non-blocking mode.
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*/
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static IntrRecvError InterruptibleRecv(char* data, size_t len, int timeout, SOCKET& hSocket)
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{
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int64_t curTime = GetTimeMillis();
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int64_t endTime = curTime + timeout;
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// Maximum time to wait in one select call. It will take up until this time (in millis)
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// to break off in case of an interruption.
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const int64_t maxWait = 1000;
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while (len > 0 && curTime < endTime) {
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ssize_t ret = recv(hSocket, data, len, 0); // Optimistically try the recv first
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if (ret > 0) {
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len -= ret;
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data += ret;
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} else if (ret == 0) { // Unexpected disconnection
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return IntrRecvError::Disconnected;
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} else { // Other error or blocking
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int nErr = WSAGetLastError();
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if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL) {
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if (!IsSelectableSocket(hSocket)) {
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return IntrRecvError::NetworkError;
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}
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struct timeval tval = MillisToTimeval(std::min(endTime - curTime, maxWait));
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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, &fdset, NULL, NULL, &tval);
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if (nRet == SOCKET_ERROR) {
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return IntrRecvError::NetworkError;
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}
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} else {
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return IntrRecvError::Disconnected;
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}
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}
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if (interruptSocks5Recv)
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return IntrRecvError::Interrupted;
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curTime = GetTimeMillis();
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}
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return len == 0 ? IntrRecvError::OK : IntrRecvError::Timeout;
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}
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struct ProxyCredentials
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{
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std::string username;
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std::string password;
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};
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std::string Socks5ErrorString(int err)
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{
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switch(err) {
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case 0x01: return "general failure";
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case 0x02: return "connection not allowed";
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case 0x03: return "network unreachable";
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case 0x04: return "host unreachable";
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case 0x05: return "connection refused";
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case 0x06: return "TTL expired";
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case 0x07: return "protocol error";
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case 0x08: return "address type not supported";
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default: return "unknown";
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}
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}
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/** Connect using SOCKS5 (as described in RFC1928) */
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static bool Socks5(const std::string& strDest, int port, const ProxyCredentials *auth, SOCKET& hSocket)
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{
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IntrRecvError recvr;
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LogPrint("net", "SOCKS5 connecting %s\n", strDest);
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if (strDest.size() > 255) {
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CloseSocket(hSocket);
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return error("Hostname too long");
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}
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// Accepted authentication methods
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std::vector<uint8_t> vSocks5Init;
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vSocks5Init.push_back(0x05);
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if (auth) {
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vSocks5Init.push_back(0x02); // # METHODS
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vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
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vSocks5Init.push_back(0x02); // X'02' USERNAME/PASSWORD (RFC1929)
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} else {
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vSocks5Init.push_back(0x01); // # METHODS
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vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
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}
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ssize_t ret = send(hSocket, (const char*)vSocks5Init.data(), vSocks5Init.size(), MSG_NOSIGNAL);
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if (ret != (ssize_t)vSocks5Init.size()) {
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CloseSocket(hSocket);
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return error("Error sending to proxy");
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}
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char pchRet1[2];
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if ((recvr = InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
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CloseSocket(hSocket);
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LogPrintf("Socks5() connect to %s:%d failed: InterruptibleRecv() timeout or other failure\n", strDest, port);
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return false;
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}
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if (pchRet1[0] != 0x05) {
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CloseSocket(hSocket);
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return error("Proxy failed to initialize");
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}
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if (pchRet1[1] == 0x02 && auth) {
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// Perform username/password authentication (as described in RFC1929)
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std::vector<uint8_t> vAuth;
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vAuth.push_back(0x01);
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if (auth->username.size() > 255 || auth->password.size() > 255)
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return error("Proxy username or password too long");
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vAuth.push_back(auth->username.size());
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vAuth.insert(vAuth.end(), auth->username.begin(), auth->username.end());
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vAuth.push_back(auth->password.size());
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vAuth.insert(vAuth.end(), auth->password.begin(), auth->password.end());
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ret = send(hSocket, (const char*)vAuth.data(), vAuth.size(), MSG_NOSIGNAL);
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if (ret != (ssize_t)vAuth.size()) {
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CloseSocket(hSocket);
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return error("Error sending authentication to proxy");
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}
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LogPrint("proxy", "SOCKS5 sending proxy authentication %s:%s\n", auth->username, auth->password);
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char pchRetA[2];
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if (( recvr = InterruptibleRecv(pchRetA, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
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CloseSocket(hSocket);
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return error("Error reading proxy authentication response");
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}
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if (pchRetA[0] != 0x01 || pchRetA[1] != 0x00) {
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CloseSocket(hSocket);
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return error("Proxy authentication unsuccessful");
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}
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} else if (pchRet1[1] == 0x00) {
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// Perform no authentication
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} else {
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CloseSocket(hSocket);
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return error("Proxy requested wrong authentication method %02x", pchRet1[1]);
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}
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std::vector<uint8_t> vSocks5;
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vSocks5.push_back(0x05); // VER protocol version
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vSocks5.push_back(0x01); // CMD CONNECT
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vSocks5.push_back(0x00); // RSV Reserved
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vSocks5.push_back(0x03); // ATYP DOMAINNAME
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vSocks5.push_back(strDest.size()); // Length<=255 is checked at beginning of function
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vSocks5.insert(vSocks5.end(), strDest.begin(), strDest.end());
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vSocks5.push_back((port >> 8) & 0xFF);
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vSocks5.push_back((port >> 0) & 0xFF);
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ret = send(hSocket, (const char*)vSocks5.data(), vSocks5.size(), MSG_NOSIGNAL);
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if (ret != (ssize_t)vSocks5.size()) {
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CloseSocket(hSocket);
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return error("Error sending to proxy");
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}
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char pchRet2[4];
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if ((recvr = InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
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CloseSocket(hSocket);
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if (recvr == IntrRecvError::Timeout) {
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/* If a timeout happens here, this effectively means we timed out while connecting
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* to the remote node. This is very common for Tor, so do not print an
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* error message. */
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return false;
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} else {
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return error("Error while reading proxy response");
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}
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}
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if (pchRet2[0] != 0x05) {
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CloseSocket(hSocket);
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return error("Proxy failed to accept request");
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}
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if (pchRet2[1] != 0x00) {
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// Failures to connect to a peer that are not proxy errors
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CloseSocket(hSocket);
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LogPrintf("Socks5() connect to %s:%d failed: %s\n", strDest, port, Socks5ErrorString(pchRet2[1]));
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return false;
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}
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if (pchRet2[2] != 0x00) {
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CloseSocket(hSocket);
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return error("Error: malformed proxy response");
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}
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char pchRet3[256];
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switch (pchRet2[3])
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{
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case 0x01: recvr = InterruptibleRecv(pchRet3, 4, SOCKS5_RECV_TIMEOUT, hSocket); break;
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case 0x04: recvr = InterruptibleRecv(pchRet3, 16, SOCKS5_RECV_TIMEOUT, hSocket); break;
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case 0x03:
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{
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recvr = InterruptibleRecv(pchRet3, 1, SOCKS5_RECV_TIMEOUT, hSocket);
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if (recvr != IntrRecvError::OK) {
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CloseSocket(hSocket);
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return error("Error reading from proxy");
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}
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int nRecv = pchRet3[0];
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recvr = InterruptibleRecv(pchRet3, nRecv, SOCKS5_RECV_TIMEOUT, hSocket);
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break;
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}
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default: CloseSocket(hSocket); return error("Error: malformed proxy response");
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}
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if (recvr != IntrRecvError::OK) {
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CloseSocket(hSocket);
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return error("Error reading from proxy");
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}
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if ((recvr = InterruptibleRecv(pchRet3, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
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CloseSocket(hSocket);
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return error("Error reading from proxy");
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}
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LogPrint("net", "SOCKS5 connected %s\n", strDest);
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return true;
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}
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bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRet, int nTimeout)
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{
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hSocketRet = INVALID_SOCKET;
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struct sockaddr_storage sockaddr;
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socklen_t len = sizeof(sockaddr);
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if (!addrConnect.GetSockAddr((struct sockaddr*)&sockaddr, &len)) {
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LogPrintf("Cannot connect to %s: unsupported network\n", addrConnect.ToString());
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return false;
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}
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SOCKET hSocket = socket(((struct sockaddr*)&sockaddr)->sa_family, SOCK_STREAM, IPPROTO_TCP);
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if (hSocket == INVALID_SOCKET)
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return false;
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int set = 1;
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#ifdef SO_NOSIGPIPE
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// Different way of disabling SIGPIPE on BSD
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setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
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#endif
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//Disable Nagle's algorithm
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#ifdef WIN32
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setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&set, sizeof(int));
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#else
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setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (void*)&set, sizeof(int));
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#endif
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// Set to non-blocking
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if (!SetSocketNonBlocking(hSocket, true))
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return error("ConnectSocketDirectly: Setting socket to non-blocking failed, error %s\n", NetworkErrorString(WSAGetLastError()));
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if (connect(hSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR)
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{
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int nErr = WSAGetLastError();
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// WSAEINVAL is here because some legacy version of winsock uses it
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if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL)
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{
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struct timeval timeout = MillisToTimeval(nTimeout);
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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)
|
|
{
|
|
LogPrint("net", "connection to %s timeout\n", addrConnect.ToString());
|
|
CloseSocket(hSocket);
|
|
return false;
|
|
}
|
|
if (nRet == SOCKET_ERROR)
|
|
{
|
|
LogPrintf("select() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(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
|
|
{
|
|
LogPrintf("getsockopt() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
|
|
CloseSocket(hSocket);
|
|
return false;
|
|
}
|
|
if (nRet != 0)
|
|
{
|
|
LogPrintf("connect() to %s failed after select(): %s\n", addrConnect.ToString(), NetworkErrorString(nRet));
|
|
CloseSocket(hSocket);
|
|
return false;
|
|
}
|
|
}
|
|
#ifdef WIN32
|
|
else if (WSAGetLastError() != WSAEISCONN)
|
|
#else
|
|
else
|
|
#endif
|
|
{
|
|
LogPrintf("connect() to %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
|
|
CloseSocket(hSocket);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
hSocketRet = hSocket;
|
|
return true;
|
|
}
|
|
|
|
bool SetProxy(enum Network net, const proxyType &addrProxy) {
|
|
assert(net >= 0 && net < NET_MAX);
|
|
if (!addrProxy.IsValid())
|
|
return false;
|
|
LOCK(cs_proxyInfos);
|
|
proxyInfo[net] = addrProxy;
|
|
return true;
|
|
}
|
|
|
|
bool GetProxy(enum Network net, proxyType &proxyInfoOut) {
|
|
assert(net >= 0 && net < NET_MAX);
|
|
LOCK(cs_proxyInfos);
|
|
if (!proxyInfo[net].IsValid())
|
|
return false;
|
|
proxyInfoOut = proxyInfo[net];
|
|
return true;
|
|
}
|
|
|
|
bool SetNameProxy(const proxyType &addrProxy) {
|
|
if (!addrProxy.IsValid())
|
|
return false;
|
|
LOCK(cs_proxyInfos);
|
|
nameProxy = addrProxy;
|
|
return true;
|
|
}
|
|
|
|
bool GetNameProxy(proxyType &nameProxyOut) {
|
|
LOCK(cs_proxyInfos);
|
|
if(!nameProxy.IsValid())
|
|
return false;
|
|
nameProxyOut = nameProxy;
|
|
return true;
|
|
}
|
|
|
|
bool HaveNameProxy() {
|
|
LOCK(cs_proxyInfos);
|
|
return nameProxy.IsValid();
|
|
}
|
|
|
|
bool IsProxy(const CNetAddr &addr) {
|
|
LOCK(cs_proxyInfos);
|
|
for (int i = 0; i < NET_MAX; i++) {
|
|
if (addr == (CNetAddr)proxyInfo[i].proxy)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int port, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
|
|
{
|
|
SOCKET hSocket = INVALID_SOCKET;
|
|
// first connect to proxy server
|
|
if (!ConnectSocketDirectly(proxy.proxy, hSocket, nTimeout)) {
|
|
if (outProxyConnectionFailed)
|
|
*outProxyConnectionFailed = true;
|
|
return false;
|
|
}
|
|
// do socks negotiation
|
|
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;
|
|
} else {
|
|
if (!Socks5(strDest, (unsigned short)port, 0, hSocket))
|
|
return false;
|
|
}
|
|
|
|
hSocketRet = hSocket;
|
|
return true;
|
|
}
|
|
|
|
bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
|
|
{
|
|
proxyType proxy;
|
|
if (outProxyConnectionFailed)
|
|
*outProxyConnectionFailed = false;
|
|
|
|
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);
|
|
}
|
|
|
|
bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest, int portDefault, int nTimeout, bool *outProxyConnectionFailed)
|
|
{
|
|
std::string strDest;
|
|
int port = portDefault;
|
|
|
|
if (outProxyConnectionFailed)
|
|
*outProxyConnectionFailed = false;
|
|
|
|
SplitHostPort(std::string(pszDest), port, strDest);
|
|
|
|
proxyType proxy;
|
|
GetNameProxy(proxy);
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
addr = CService();
|
|
|
|
if (!HaveNameProxy())
|
|
return false;
|
|
return ConnectThroughProxy(proxy, strDest, port, hSocketRet, nTimeout, outProxyConnectionFailed);
|
|
}
|
|
|
|
bool LookupSubNet(const char* pszName, CSubNet& ret)
|
|
{
|
|
std::string strSubnet(pszName);
|
|
size_t slash = strSubnet.find_last_of('/');
|
|
std::vector<CNetAddr> vIP;
|
|
|
|
std::string strAddress = strSubnet.substr(0, slash);
|
|
if (LookupHost(strAddress.c_str(), vIP, 1, false))
|
|
{
|
|
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
|
|
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
|
|
{
|
|
// 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();
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
#ifdef WIN32
|
|
std::string NetworkErrorString(int err)
|
|
{
|
|
char buf[256];
|
|
buf[0] = 0;
|
|
if(FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,
|
|
NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
|
|
buf, sizeof(buf), NULL))
|
|
{
|
|
return strprintf("%s (%d)", buf, err);
|
|
}
|
|
else
|
|
{
|
|
return strprintf("Unknown error (%d)", err);
|
|
}
|
|
}
|
|
#else
|
|
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. */
|
|
#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 */
|
|
if (strerror_r(err, buf, sizeof(buf)))
|
|
buf[0] = 0;
|
|
#endif
|
|
return strprintf("%s (%d)", s, err);
|
|
}
|
|
#endif
|
|
|
|
bool CloseSocket(SOCKET& hSocket)
|
|
{
|
|
if (hSocket == INVALID_SOCKET)
|
|
return false;
|
|
#ifdef WIN32
|
|
int ret = closesocket(hSocket);
|
|
#else
|
|
int ret = close(hSocket);
|
|
#endif
|
|
hSocket = INVALID_SOCKET;
|
|
return ret != SOCKET_ERROR;
|
|
}
|
|
|
|
bool SetSocketNonBlocking(SOCKET& hSocket, bool fNonBlocking)
|
|
{
|
|
if (fNonBlocking) {
|
|
#ifdef WIN32
|
|
u_long nOne = 1;
|
|
if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR) {
|
|
#else
|
|
int fFlags = fcntl(hSocket, F_GETFL, 0);
|
|
if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == SOCKET_ERROR) {
|
|
#endif
|
|
CloseSocket(hSocket);
|
|
return false;
|
|
}
|
|
} else {
|
|
#ifdef WIN32
|
|
u_long nZero = 0;
|
|
if (ioctlsocket(hSocket, FIONBIO, &nZero) == SOCKET_ERROR) {
|
|
#else
|
|
int fFlags = fcntl(hSocket, F_GETFL, 0);
|
|
if (fcntl(hSocket, F_SETFL, fFlags & ~O_NONBLOCK) == SOCKET_ERROR) {
|
|
#endif
|
|
CloseSocket(hSocket);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void InterruptSocks5(bool interrupt)
|
|
{
|
|
interruptSocks5Recv = interrupt;
|
|
}
|