LCOV - code coverage report
Current view: top level - src - netbase.cpp (source / functions) Hit Total Coverage
Test: total_coverage.info Lines: 511 644 79.3 %
Date: 2015-10-12 22:39:14 Functions: 82 101 81.2 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : // Copyright (c) 2009-2010 Satoshi Nakamoto
       2             : // Copyright (c) 2009-2014 The Bitcoin Core developers
       3             : // Distributed under the MIT software license, see the accompanying
       4             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       5             : 
       6             : #ifdef HAVE_CONFIG_H
       7             : #include "config/bitcoin-config.h"
       8             : #endif
       9             : 
      10             : #include "netbase.h"
      11             : 
      12             : #include "hash.h"
      13             : #include "sync.h"
      14             : #include "uint256.h"
      15             : #include "random.h"
      16             : #include "util.h"
      17             : #include "utilstrencodings.h"
      18             : 
      19             : #ifdef HAVE_GETADDRINFO_A
      20             : #include <netdb.h>
      21             : #endif
      22             : 
      23             : #ifndef WIN32
      24             : #if HAVE_INET_PTON
      25             : #include <arpa/inet.h>
      26             : #endif
      27             : #include <fcntl.h>
      28             : #endif
      29             : 
      30             : #include <boost/algorithm/string/case_conv.hpp> // for to_lower()
      31             : #include <boost/algorithm/string/predicate.hpp> // for startswith() and endswith()
      32             : #include <boost/thread.hpp>
      33             : 
      34             : #if !defined(HAVE_MSG_NOSIGNAL) && !defined(MSG_NOSIGNAL)
      35             : #define MSG_NOSIGNAL 0
      36             : #endif
      37             : 
      38             : // Settings
      39         384 : static proxyType proxyInfo[NET_MAX];
      40             : static proxyType nameProxy;
      41          96 : static CCriticalSection cs_proxyInfos;
      42             : int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
      43             : bool fNameLookup = false;
      44             : 
      45             : static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
      46             : 
      47             : // Need ample time for negotiation for very slow proxies such as Tor (milliseconds)
      48             : static const int SOCKS5_RECV_TIMEOUT = 20 * 1000;
      49             : 
      50           0 : enum Network ParseNetwork(std::string net) {
      51           0 :     boost::to_lower(net);
      52           0 :     if (net == "ipv4") return NET_IPV4;
      53           0 :     if (net == "ipv6") return NET_IPV6;
      54           0 :     if (net == "tor" || net == "onion")  return NET_TOR;
      55           0 :     return NET_UNROUTABLE;
      56             : }
      57             : 
      58          12 : std::string GetNetworkName(enum Network net) {
      59          12 :     switch(net)
      60             :     {
      61           8 :     case NET_IPV4: return "ipv4";
      62           8 :     case NET_IPV6: return "ipv6";
      63           8 :     case NET_TOR: return "onion";
      64           0 :     default: return "";
      65             :     }
      66             : }
      67             : 
      68        8159 : void SplitHostPort(std::string in, int &portOut, std::string &hostOut) {
      69        8159 :     size_t colon = in.find_last_of(':');
      70             :     // if a : is found, and it either follows a [...], or no other : is in the string, treat it as port separator
      71        8159 :     bool fHaveColon = colon != in.npos;
      72        8347 :     bool fBracketed = fHaveColon && (in[0]=='[' && in[colon-1]==']'); // if there is a colon, and in[0]=='[', colon is not 0, so in[colon-1] is safe
      73        8336 :     bool fMultiColon = fHaveColon && (in.find_last_of(':',colon-1) != in.npos);
      74        8159 :     if (fHaveColon && (colon==0 || fBracketed || !fMultiColon)) {
      75             :         int32_t n;
      76         344 :         if (ParseInt32(in.substr(colon + 1), &n) && n > 0 && n < 0x10000) {
      77         320 :             in = in.substr(0, colon);
      78         160 :             portOut = n;
      79             :         }
      80             :     }
      81       16344 :     if (in.size()>0 && in[0] == '[' && in[in.size()-1] == ']')
      82          28 :         hostOut = in.substr(1, in.size()-2);
      83             :     else
      84             :         hostOut = in;
      85        8159 : }
      86             : 
      87        8548 : bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
      88             : {
      89             :     vIP.clear();
      90             : 
      91             :     {
      92             :         CNetAddr addr;
      93       25644 :         if (addr.SetSpecial(std::string(pszName))) {
      94           4 :             vIP.push_back(addr);
      95           4 :             return true;
      96             :         }
      97             :     }
      98             : 
      99             : #ifdef HAVE_GETADDRINFO_A
     100             :     struct in_addr ipv4_addr;
     101             : #ifdef HAVE_INET_PTON
     102        8544 :     if (inet_pton(AF_INET, pszName, &ipv4_addr) > 0) {
     103        8356 :         vIP.push_back(CNetAddr(ipv4_addr));
     104        8356 :         return true;
     105             :     }
     106             : 
     107             :     struct in6_addr ipv6_addr;
     108         188 :     if (inet_pton(AF_INET6, pszName, &ipv6_addr) > 0) {
     109         160 :         vIP.push_back(CNetAddr(ipv6_addr));
     110         160 :         return true;
     111             :     }
     112             : #else
     113             :     ipv4_addr.s_addr = inet_addr(pszName);
     114             :     if (ipv4_addr.s_addr != INADDR_NONE) {
     115             :         vIP.push_back(CNetAddr(ipv4_addr));
     116             :         return true;
     117             :     }
     118             : #endif
     119             : #endif
     120             : 
     121             :     struct addrinfo aiHint;
     122             :     memset(&aiHint, 0, sizeof(struct addrinfo));
     123          28 :     aiHint.ai_socktype = SOCK_STREAM;
     124          28 :     aiHint.ai_protocol = IPPROTO_TCP;
     125             :     aiHint.ai_family = AF_UNSPEC;
     126             : #ifdef WIN32
     127             :     aiHint.ai_flags = fAllowLookup ? 0 : AI_NUMERICHOST;
     128             : #else
     129          28 :     aiHint.ai_flags = fAllowLookup ? AI_ADDRCONFIG : AI_NUMERICHOST;
     130             : #endif
     131             : 
     132          28 :     struct addrinfo *aiRes = NULL;
     133             : #ifdef HAVE_GETADDRINFO_A
     134          28 :     struct gaicb gcb, *query = &gcb;
     135          28 :     memset(query, 0, sizeof(struct gaicb));
     136          28 :     gcb.ar_name = pszName;
     137          28 :     gcb.ar_request = &aiHint;
     138          28 :     int nErr = getaddrinfo_a(GAI_NOWAIT, &query, 1, NULL);
     139          28 :     if (nErr)
     140             :         return false;
     141             : 
     142          28 :     do {
     143             :         // Should set the timeout limit to a resonable value to avoid
     144             :         // generating unnecessary checking call during the polling loop,
     145             :         // while it can still response to stop request quick enough.
     146             :         // 2 seconds looks fine in our situation.
     147          28 :         struct timespec ts = { 2, 0 };
     148          28 :         gai_suspend(&query, 1, &ts);
     149          28 :         boost::this_thread::interruption_point();
     150             : 
     151          28 :         nErr = gai_error(query);
     152          28 :         if (0 == nErr)
     153           0 :             aiRes = query->ar_result;
     154             :     } while (nErr == EAI_INPROGRESS);
     155             : #else
     156             :     int nErr = getaddrinfo(pszName, NULL, &aiHint, &aiRes);
     157             : #endif
     158          28 :     if (nErr)
     159             :         return false;
     160             : 
     161           0 :     struct addrinfo *aiTrav = aiRes;
     162           0 :     while (aiTrav != NULL && (nMaxSolutions == 0 || vIP.size() < nMaxSolutions))
     163             :     {
     164           0 :         if (aiTrav->ai_family == AF_INET)
     165             :         {
     166           0 :             assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in));
     167           0 :             vIP.push_back(CNetAddr(((struct sockaddr_in*)(aiTrav->ai_addr))->sin_addr));
     168             :         }
     169             : 
     170           0 :         if (aiTrav->ai_family == AF_INET6)
     171             :         {
     172           0 :             assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in6));
     173           0 :             vIP.push_back(CNetAddr(((struct sockaddr_in6*)(aiTrav->ai_addr))->sin6_addr));
     174             :         }
     175             : 
     176           0 :         aiTrav = aiTrav->ai_next;
     177             :     }
     178             : 
     179           0 :     freeaddrinfo(aiRes);
     180             : 
     181           0 :     return (vIP.size() > 0);
     182             : }
     183             : 
     184         552 : bool LookupHost(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
     185             : {
     186        1104 :     std::string strHost(pszName);
     187         552 :     if (strHost.empty())
     188             :         return false;
     189         551 :     if (boost::algorithm::starts_with(strHost, "[") && boost::algorithm::ends_with(strHost, "]"))
     190             :     {
     191           0 :         strHost = strHost.substr(1, strHost.size() - 2);
     192             :     }
     193             : 
     194        1102 :     return LookupIntern(strHost.c_str(), vIP, nMaxSolutions, fAllowLookup);
     195             : }
     196             : 
     197        7997 : bool Lookup(const char *pszName, std::vector<CService>& vAddr, int portDefault, bool fAllowLookup, unsigned int nMaxSolutions)
     198             : {
     199        7997 :     if (pszName[0] == 0)
     200             :         return false;
     201        7997 :     int port = portDefault;
     202       15994 :     std::string hostname = "";
     203       23991 :     SplitHostPort(std::string(pszName), port, hostname);
     204             : 
     205             :     std::vector<CNetAddr> vIP;
     206       15994 :     bool fRet = LookupIntern(hostname.c_str(), vIP, nMaxSolutions, fAllowLookup);
     207        7997 :     if (!fRet)
     208             :         return false;
     209       15968 :     vAddr.resize(vIP.size());
     210       31936 :     for (unsigned int i = 0; i < vIP.size(); i++)
     211       31936 :         vAddr[i] = CService(vIP[i], port);
     212             :     return true;
     213             : }
     214             : 
     215        7997 : bool Lookup(const char *pszName, CService& addr, int portDefault, bool fAllowLookup)
     216             : {
     217             :     std::vector<CService> vService;
     218        7997 :     bool fRet = Lookup(pszName, vService, portDefault, fAllowLookup, 1);
     219        7997 :     if (!fRet)
     220             :         return false;
     221        7984 :     addr = vService[0];
     222        7984 :     return true;
     223             : }
     224             : 
     225           7 : bool LookupNumeric(const char *pszName, CService& addr, int portDefault)
     226             : {
     227           7 :     return Lookup(pszName, addr, portDefault, false);
     228             : }
     229             : 
     230             : /**
     231             :  * Convert milliseconds to a struct timeval for select.
     232             :  */
     233             : struct timeval static MillisToTimeval(int64_t nTimeout)
     234             : {
     235             :     struct timeval timeout;
     236         173 :     timeout.tv_sec  = nTimeout / 1000;
     237         173 :     timeout.tv_usec = (nTimeout % 1000) * 1000;
     238             :     return timeout;
     239             : }
     240             : 
     241             : /**
     242             :  * Read bytes from socket. This will either read the full number of bytes requested
     243             :  * or return False on error or timeout.
     244             :  * This function can be interrupted by boost thread interrupt.
     245             :  *
     246             :  * @param data Buffer to receive into
     247             :  * @param len  Length of data to receive
     248             :  * @param timeout  Timeout in milliseconds for receive operation
     249             :  *
     250             :  * @note This function requires that hSocket is in non-blocking mode.
     251             :  */
     252          64 : bool static InterruptibleRecv(char* data, size_t len, int timeout, SOCKET& hSocket)
     253             : {
     254          64 :     int64_t curTime = GetTimeMillis();
     255          64 :     int64_t endTime = curTime + timeout;
     256             :     // Maximum time to wait in one select call. It will take up until this time (in millis)
     257             :     // to break off in case of an interruption.
     258          64 :     const int64_t maxWait = 1000;
     259         226 :     while (len > 0 && curTime < endTime) {
     260         196 :         ssize_t ret = recv(hSocket, data, len, 0); // Optimistically try the recv first
     261          98 :         if (ret > 0) {
     262          64 :             len -= ret;
     263          64 :             data += ret;
     264          34 :         } else if (ret == 0) { // Unexpected disconnection
     265             :             return false;
     266             :         } else { // Other error or blocking
     267          34 :             int nErr = WSAGetLastError();
     268          34 :             if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL) {
     269          34 :                 if (!IsSelectableSocket(hSocket)) {
     270           0 :                     return false;
     271             :                 }
     272         102 :                 struct timeval tval = MillisToTimeval(std::min(endTime - curTime, maxWait));
     273             :                 fd_set fdset;
     274          34 :                 FD_ZERO(&fdset);
     275          34 :                 FD_SET(hSocket, &fdset);
     276          34 :                 int nRet = select(hSocket + 1, &fdset, NULL, NULL, &tval);
     277          34 :                 if (nRet == SOCKET_ERROR) {
     278             :                     return false;
     279          34 :                 }
     280             :             } else {
     281             :                 return false;
     282             :             }
     283             :         }
     284          98 :         boost::this_thread::interruption_point();
     285          98 :         curTime = GetTimeMillis();
     286             :     }
     287          64 :     return len == 0;
     288             : }
     289             : 
     290          40 : struct ProxyCredentials
     291             : {
     292             :     std::string username;
     293             :     std::string password;
     294             : };
     295             : 
     296             : /** Connect using SOCKS5 (as described in RFC1928) */
     297          15 : static bool Socks5(const std::string& strDest, int port, const ProxyCredentials *auth, SOCKET& hSocket)
     298             : {
     299          15 :     LogPrintf("SOCKS5 connecting %s\n", strDest);
     300          15 :     if (strDest.size() > 255) {
     301             :         CloseSocket(hSocket);
     302           0 :         return error("Hostname too long");
     303             :     }
     304             :     // Accepted authentication methods
     305             :     std::vector<uint8_t> vSocks5Init;
     306          15 :     vSocks5Init.push_back(0x05);
     307          15 :     if (auth) {
     308           8 :         vSocks5Init.push_back(0x02); // # METHODS
     309           8 :         vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
     310           8 :         vSocks5Init.push_back(0x02); // X'02' USERNAME/PASSWORD (RFC1929)
     311             :     } else {
     312           7 :         vSocks5Init.push_back(0x01); // # METHODS
     313           7 :         vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
     314             :     }
     315          45 :     ssize_t ret = send(hSocket, (const char*)begin_ptr(vSocks5Init), vSocks5Init.size(), MSG_NOSIGNAL);
     316          30 :     if (ret != (ssize_t)vSocks5Init.size()) {
     317             :         CloseSocket(hSocket);
     318           0 :         return error("Error sending to proxy");
     319             :     }
     320             :     char pchRet1[2];
     321          15 :     if (!InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
     322             :         CloseSocket(hSocket);
     323           0 :         return error("Error reading proxy response");
     324             :     }
     325          15 :     if (pchRet1[0] != 0x05) {
     326             :         CloseSocket(hSocket);
     327           0 :         return error("Proxy failed to initialize");
     328             :     }
     329          15 :     if (pchRet1[1] == 0x02 && auth) {
     330             :         // Perform username/password authentication (as described in RFC1929)
     331             :         std::vector<uint8_t> vAuth;
     332           4 :         vAuth.push_back(0x01);
     333          12 :         if (auth->username.size() > 255 || auth->password.size() > 255)
     334           0 :             return error("Proxy username or password too long");
     335           4 :         vAuth.push_back(auth->username.size());
     336          12 :         vAuth.insert(vAuth.end(), auth->username.begin(), auth->username.end());
     337           8 :         vAuth.push_back(auth->password.size());
     338          12 :         vAuth.insert(vAuth.end(), auth->password.begin(), auth->password.end());
     339          12 :         ret = send(hSocket, (const char*)begin_ptr(vAuth), vAuth.size(), MSG_NOSIGNAL);
     340           8 :         if (ret != (ssize_t)vAuth.size()) {
     341             :             CloseSocket(hSocket);
     342           0 :             return error("Error sending authentication to proxy");
     343             :         }
     344           4 :         LogPrint("proxy", "SOCKS5 sending proxy authentication %s:%s\n", auth->username, auth->password);
     345             :         char pchRetA[2];
     346           4 :         if (!InterruptibleRecv(pchRetA, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
     347             :             CloseSocket(hSocket);
     348           0 :             return error("Error reading proxy authentication response");
     349             :         }
     350           4 :         if (pchRetA[0] != 0x01 || pchRetA[1] != 0x00) {
     351             :             CloseSocket(hSocket);
     352           0 :             return error("Proxy authentication unsuccessful");
     353           4 :         }
     354          11 :     } else if (pchRet1[1] == 0x00) {
     355             :         // Perform no authentication
     356             :     } else {
     357             :         CloseSocket(hSocket);
     358           0 :         return error("Proxy requested wrong authentication method %02x", pchRet1[1]);
     359             :     }
     360             :     std::vector<uint8_t> vSocks5;
     361          15 :     vSocks5.push_back(0x05); // VER protocol version
     362          15 :     vSocks5.push_back(0x01); // CMD CONNECT
     363          15 :     vSocks5.push_back(0x00); // RSV Reserved
     364          15 :     vSocks5.push_back(0x03); // ATYP DOMAINNAME
     365          15 :     vSocks5.push_back(strDest.size()); // Length<=255 is checked at beginning of function
     366          15 :     vSocks5.insert(vSocks5.end(), strDest.begin(), strDest.end());
     367          15 :     vSocks5.push_back((port >> 8) & 0xFF);
     368          15 :     vSocks5.push_back((port >> 0) & 0xFF);
     369          45 :     ret = send(hSocket, (const char*)begin_ptr(vSocks5), vSocks5.size(), MSG_NOSIGNAL);
     370          30 :     if (ret != (ssize_t)vSocks5.size()) {
     371             :         CloseSocket(hSocket);
     372           0 :         return error("Error sending to proxy");
     373             :     }
     374             :     char pchRet2[4];
     375          15 :     if (!InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket)) {
     376             :         CloseSocket(hSocket);
     377           0 :         return error("Error reading proxy response");
     378             :     }
     379          15 :     if (pchRet2[0] != 0x05) {
     380             :         CloseSocket(hSocket);
     381           0 :         return error("Proxy failed to accept request");
     382             :     }
     383          15 :     if (pchRet2[1] != 0x00) {
     384             :         CloseSocket(hSocket);
     385           0 :         switch (pchRet2[1])
     386             :         {
     387           0 :             case 0x01: return error("Proxy error: general failure");
     388           0 :             case 0x02: return error("Proxy error: connection not allowed");
     389           0 :             case 0x03: return error("Proxy error: network unreachable");
     390           0 :             case 0x04: return error("Proxy error: host unreachable");
     391           0 :             case 0x05: return error("Proxy error: connection refused");
     392           0 :             case 0x06: return error("Proxy error: TTL expired");
     393           0 :             case 0x07: return error("Proxy error: protocol error");
     394           0 :             case 0x08: return error("Proxy error: address type not supported");
     395           0 :             default:   return error("Proxy error: unknown");
     396             :         }
     397             :     }
     398          15 :     if (pchRet2[2] != 0x00) {
     399             :         CloseSocket(hSocket);
     400           0 :         return error("Error: malformed proxy response");
     401             :     }
     402             :     char pchRet3[256];
     403          15 :     switch (pchRet2[3])
     404             :     {
     405          15 :         case 0x01: ret = InterruptibleRecv(pchRet3, 4, SOCKS5_RECV_TIMEOUT, hSocket); break;
     406           0 :         case 0x04: ret = InterruptibleRecv(pchRet3, 16, SOCKS5_RECV_TIMEOUT, hSocket); break;
     407             :         case 0x03:
     408             :         {
     409           0 :             ret = InterruptibleRecv(pchRet3, 1, SOCKS5_RECV_TIMEOUT, hSocket);
     410           0 :             if (!ret) {
     411             :                 CloseSocket(hSocket);
     412           0 :                 return error("Error reading from proxy");
     413             :             }
     414           0 :             int nRecv = pchRet3[0];
     415           0 :             ret = InterruptibleRecv(pchRet3, nRecv, SOCKS5_RECV_TIMEOUT, hSocket);
     416           0 :             break;
     417             :         }
     418           0 :         default: CloseSocket(hSocket); return error("Error: malformed proxy response");
     419             :     }
     420          15 :     if (!ret) {
     421             :         CloseSocket(hSocket);
     422           0 :         return error("Error reading from proxy");
     423             :     }
     424          15 :     if (!InterruptibleRecv(pchRet3, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
     425             :         CloseSocket(hSocket);
     426           0 :         return error("Error reading from proxy");
     427             :     }
     428          15 :     LogPrintf("SOCKS5 connected %s\n", strDest);
     429             :     return true;
     430             : }
     431             : 
     432         139 : bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRet, int nTimeout)
     433             : {
     434         139 :     hSocketRet = INVALID_SOCKET;
     435             : 
     436             :     struct sockaddr_storage sockaddr;
     437         139 :     socklen_t len = sizeof(sockaddr);
     438         139 :     if (!addrConnect.GetSockAddr((struct sockaddr*)&sockaddr, &len)) {
     439           0 :         LogPrintf("Cannot connect to %s: unsupported network\n", addrConnect.ToString());
     440           0 :         return false;
     441             :     }
     442             : 
     443         139 :     SOCKET hSocket = socket(((struct sockaddr*)&sockaddr)->sa_family, SOCK_STREAM, IPPROTO_TCP);
     444         139 :     if (hSocket == INVALID_SOCKET)
     445             :         return false;
     446             : 
     447             : #ifdef SO_NOSIGPIPE
     448             :     int set = 1;
     449             :     // Different way of disabling SIGPIPE on BSD
     450             :     setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
     451             : #endif
     452             : 
     453             :     // Set to non-blocking
     454         139 :     if (!SetSocketNonBlocking(hSocket, true))
     455           0 :         return error("ConnectSocketDirectly: Setting socket to non-blocking failed, error %s\n", NetworkErrorString(WSAGetLastError()));
     456             : 
     457         139 :     if (connect(hSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR)
     458             :     {
     459         139 :         int nErr = WSAGetLastError();
     460             :         // WSAEINVAL is here because some legacy version of winsock uses it
     461         139 :         if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL)
     462             :         {
     463         278 :             struct timeval timeout = MillisToTimeval(nTimeout);
     464             :             fd_set fdset;
     465         139 :             FD_ZERO(&fdset);
     466         139 :             FD_SET(hSocket, &fdset);
     467         139 :             int nRet = select(hSocket + 1, NULL, &fdset, NULL, &timeout);
     468         139 :             if (nRet == 0)
     469             :             {
     470           0 :                 LogPrint("net", "connection to %s timeout\n", addrConnect.ToString());
     471             :                 CloseSocket(hSocket);
     472           0 :                 return false;
     473             :             }
     474         139 :             if (nRet == SOCKET_ERROR)
     475             :             {
     476           0 :                 LogPrintf("select() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
     477             :                 CloseSocket(hSocket);
     478             :                 return false;
     479             :             }
     480         139 :             socklen_t nRetSize = sizeof(nRet);
     481             : #ifdef WIN32
     482             :             if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, (char*)(&nRet), &nRetSize) == SOCKET_ERROR)
     483             : #else
     484         139 :             if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, &nRet, &nRetSize) == SOCKET_ERROR)
     485             : #endif
     486             :             {
     487           0 :                 LogPrintf("getsockopt() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
     488             :                 CloseSocket(hSocket);
     489             :                 return false;
     490             :             }
     491         139 :             if (nRet != 0)
     492             :             {
     493           0 :                 LogPrintf("connect() to %s failed after select(): %s\n", addrConnect.ToString(), NetworkErrorString(nRet));
     494             :                 CloseSocket(hSocket);
     495             :                 return false;
     496         139 :             }
     497             :         }
     498             : #ifdef WIN32
     499             :         else if (WSAGetLastError() != WSAEISCONN)
     500             : #else
     501             :         else
     502             : #endif
     503             :         {
     504           0 :             LogPrintf("connect() to %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
     505             :             CloseSocket(hSocket);
     506             :             return false;
     507             :         }
     508             :     }
     509             : 
     510         139 :     hSocketRet = hSocket;
     511         139 :     return true;
     512             : }
     513             : 
     514          13 : bool SetProxy(enum Network net, const proxyType &addrProxy) {
     515          13 :     assert(net >= 0 && net < NET_MAX);
     516          13 :     if (!addrProxy.IsValid())
     517             :         return false;
     518          13 :     LOCK(cs_proxyInfos);
     519          13 :     proxyInfo[net] = addrProxy;
     520          13 :     return true;
     521             : }
     522             : 
     523         148 : bool GetProxy(enum Network net, proxyType &proxyInfoOut) {
     524         148 :     assert(net >= 0 && net < NET_MAX);
     525         148 :     LOCK(cs_proxyInfos);
     526         296 :     if (!proxyInfo[net].IsValid())
     527             :         return false;
     528          23 :     proxyInfoOut = proxyInfo[net];
     529          23 :     return true;
     530             : }
     531             : 
     532           4 : bool SetNameProxy(const proxyType &addrProxy) {
     533           4 :     if (!addrProxy.IsValid())
     534             :         return false;
     535           4 :     LOCK(cs_proxyInfos);
     536           4 :     nameProxy = addrProxy;
     537           4 :     return true;
     538             : }
     539             : 
     540         147 : bool GetNameProxy(proxyType &nameProxyOut) {
     541         147 :     LOCK(cs_proxyInfos);
     542         147 :     if(!nameProxy.IsValid())
     543             :         return false;
     544          21 :     nameProxyOut = nameProxy;
     545          21 :     return true;
     546             : }
     547             : 
     548         253 : bool HaveNameProxy() {
     549         253 :     LOCK(cs_proxyInfos);
     550         506 :     return nameProxy.IsValid();
     551             : }
     552             : 
     553          11 : bool IsProxy(const CNetAddr &addr) {
     554          11 :     LOCK(cs_proxyInfos);
     555          44 :     for (int i = 0; i < NET_MAX; i++) {
     556          88 :         if (addr == (CNetAddr)proxyInfo[i].proxy)
     557             :             return true;
     558             :     }
     559             :     return false;
     560             : }
     561             : 
     562          15 : static bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int port, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
     563             : {
     564          15 :     SOCKET hSocket = INVALID_SOCKET;
     565             :     // first connect to proxy server
     566          15 :     if (!ConnectSocketDirectly(proxy.proxy, hSocket, nTimeout)) {
     567           0 :         if (outProxyConnectionFailed)
     568           0 :             *outProxyConnectionFailed = true;
     569             :         return false;
     570             :     }
     571             :     // do socks negotiation
     572          15 :     if (proxy.randomize_credentials) {
     573             :         ProxyCredentials random_auth;
     574          16 :         random_auth.username = strprintf("%i", insecure_rand());
     575          16 :         random_auth.password = strprintf("%i", insecure_rand());
     576           8 :         if (!Socks5(strDest, (unsigned short)port, &random_auth, hSocket))
     577           0 :             return false;
     578             :     } else {
     579           7 :         if (!Socks5(strDest, (unsigned short)port, 0, hSocket))
     580             :             return false;
     581             :     }
     582             : 
     583          15 :     hSocketRet = hSocket;
     584          15 :     return true;
     585             : }
     586             : 
     587         135 : bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
     588             : {
     589             :     proxyType proxy;
     590         135 :     if (outProxyConnectionFailed)
     591           0 :         *outProxyConnectionFailed = false;
     592             : 
     593         135 :     if (GetProxy(addrDest.GetNetwork(), proxy))
     594          22 :         return ConnectThroughProxy(proxy, addrDest.ToStringIP(), addrDest.GetPort(), hSocketRet, nTimeout, outProxyConnectionFailed);
     595             :     else // no proxy needed (none set for target network)
     596         124 :         return ConnectSocketDirectly(addrDest, hSocketRet, nTimeout);
     597             : }
     598             : 
     599         147 : bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest, int portDefault, int nTimeout, bool *outProxyConnectionFailed)
     600             : {
     601             :     std::string strDest;
     602         147 :     int port = portDefault;
     603             : 
     604         147 :     if (outProxyConnectionFailed)
     605         147 :         *outProxyConnectionFailed = false;
     606             : 
     607         441 :     SplitHostPort(std::string(pszDest), port, strDest);
     608             : 
     609             :     proxyType nameProxy;
     610         147 :     GetNameProxy(nameProxy);
     611             : 
     612         294 :     CService addrResolved(CNetAddr(strDest, fNameLookup && !HaveNameProxy()), port);
     613         147 :     if (addrResolved.IsValid()) {
     614         135 :         addr = addrResolved;
     615         135 :         return ConnectSocket(addr, hSocketRet, nTimeout);
     616             :     }
     617             : 
     618          12 :     addr = CService("0.0.0.0:0");
     619             : 
     620          12 :     if (!HaveNameProxy())
     621             :         return false;
     622           4 :     return ConnectThroughProxy(nameProxy, strDest, port, hSocketRet, nTimeout, outProxyConnectionFailed);
     623             : }
     624             : 
     625           0 : void CNetAddr::Init()
     626             : {
     627       52086 :     memset(ip, 0, sizeof(ip));
     628           0 : }
     629             : 
     630           0 : void CNetAddr::SetIP(const CNetAddr& ipIn)
     631             : {
     632           0 :     memcpy(ip, ipIn.ip, sizeof(ip));
     633           0 : }
     634             : 
     635        8831 : void CNetAddr::SetRaw(Network network, const uint8_t *ip_in)
     636             : {
     637        8831 :     switch(network)
     638             :     {
     639             :         case NET_IPV4:
     640        8579 :             memcpy(ip, pchIPv4, 12);
     641        8579 :             memcpy(ip+12, ip_in, 4);
     642             :             break;
     643             :         case NET_IPV6:
     644         252 :             memcpy(ip, ip_in, 16);
     645             :             break;
     646             :         default:
     647           0 :             assert(!"invalid network");
     648             :     }
     649        8831 : }
     650             : 
     651             : static const unsigned char pchOnionCat[] = {0xFD,0x87,0xD8,0x7E,0xEB,0x43};
     652             : 
     653        8548 : bool CNetAddr::SetSpecial(const std::string &strName)
     654             : {
     655       33972 :     if (strName.size()>6 && strName.substr(strName.size() - 6, 6) == ".onion") {
     656          12 :         std::vector<unsigned char> vchAddr = DecodeBase32(strName.substr(0, strName.size() - 6).c_str());
     657           8 :         if (vchAddr.size() != 16-sizeof(pchOnionCat))
     658             :             return false;
     659           4 :         memcpy(ip, pchOnionCat, sizeof(pchOnionCat));
     660          44 :         for (unsigned int i=0; i<16-sizeof(pchOnionCat); i++)
     661          80 :             ip[i + sizeof(pchOnionCat)] = vchAddr[i];
     662             :         return true;
     663             :     }
     664             :     return false;
     665             : }
     666             : 
     667        3559 : CNetAddr::CNetAddr()
     668             : {
     669             :     Init();
     670        3559 : }
     671             : 
     672           6 : CNetAddr::CNetAddr(const struct in_addr& ipv4Addr)
     673             : {
     674        8579 :     SetRaw(NET_IPV4, (const uint8_t*)&ipv4Addr);
     675           6 : }
     676             : 
     677           1 : CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr)
     678             : {
     679         252 :     SetRaw(NET_IPV6, (const uint8_t*)&ipv6Addr);
     680           1 : }
     681             : 
     682          79 : CNetAddr::CNetAddr(const char *pszIp, bool fAllowLookup)
     683             : {
     684             :     Init();
     685             :     std::vector<CNetAddr> vIP;
     686          79 :     if (LookupHost(pszIp, vIP, 1, fAllowLookup))
     687          72 :         *this = vIP[0];
     688          79 : }
     689             : 
     690         157 : CNetAddr::CNetAddr(const std::string &strIp, bool fAllowLookup)
     691             : {
     692             :     Init();
     693             :     std::vector<CNetAddr> vIP;
     694         314 :     if (LookupHost(strIp.c_str(), vIP, 1, fAllowLookup))
     695         152 :         *this = vIP[0];
     696         157 : }
     697             : 
     698           0 : unsigned int CNetAddr::GetByte(int n) const
     699             : {
     700       29624 :     return ip[15-n];
     701             : }
     702             : 
     703           2 : bool CNetAddr::IsIPv4() const
     704             : {
     705       43524 :     return (memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0);
     706             : }
     707             : 
     708         569 : bool CNetAddr::IsIPv6() const
     709             : {
     710        1047 :     return (!IsIPv4() && !IsTor());
     711             : }
     712             : 
     713        2399 : bool CNetAddr::IsRFC1918() const
     714             : {
     715        4771 :     return IsIPv4() && (
     716        2369 :         GetByte(3) == 10 ||
     717           1 :         (GetByte(3) == 192 && GetByte(2) == 168) ||
     718           1 :         (GetByte(3) == 172 && (GetByte(2) >= 16 && GetByte(2) <= 31)));
     719             : }
     720             : 
     721        2394 : bool CNetAddr::IsRFC2544() const
     722             : {
     723        4761 :     return IsIPv4() && GetByte(3) == 198 && (GetByte(2) == 18 || GetByte(2) == 19);
     724             : }
     725             : 
     726        2395 : bool CNetAddr::IsRFC3927() const
     727             : {
     728        4765 :     return IsIPv4() && (GetByte(3) == 169 && GetByte(2) == 254);
     729             : }
     730             : 
     731        2392 : bool CNetAddr::IsRFC6598() const
     732             : {
     733        4758 :     return IsIPv4() && GetByte(3) == 100 && GetByte(2) >= 64 && GetByte(2) <= 127;
     734             : }
     735             : 
     736        2392 : bool CNetAddr::IsRFC5737() const
     737             : {
     738        4758 :     return IsIPv4() && ((GetByte(3) == 192 && GetByte(2) == 0 && GetByte(1) == 2) ||
     739           0 :         (GetByte(3) == 198 && GetByte(2) == 51 && GetByte(1) == 100) ||
     740           0 :         (GetByte(3) == 203 && GetByte(2) == 0 && GetByte(1) == 113));
     741             : }
     742             : 
     743           1 : bool CNetAddr::IsRFC3849() const
     744             : {
     745       10728 :     return GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x0D && GetByte(12) == 0xB8;
     746             : }
     747             : 
     748           1 : bool CNetAddr::IsRFC3964() const
     749             : {
     750          11 :     return (GetByte(15) == 0x20 && GetByte(14) == 0x02);
     751             : }
     752             : 
     753           1 : bool CNetAddr::IsRFC6052() const
     754             : {
     755             :     static const unsigned char pchRFC6052[] = {0,0x64,0xFF,0x9B,0,0,0,0,0,0,0,0};
     756           7 :     return (memcmp(ip, pchRFC6052, sizeof(pchRFC6052)) == 0);
     757             : }
     758             : 
     759           1 : bool CNetAddr::IsRFC4380() const
     760             : {
     761          15 :     return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0 && GetByte(12) == 0);
     762             : }
     763             : 
     764           1 : bool CNetAddr::IsRFC4862() const
     765             : {
     766             :     static const unsigned char pchRFC4862[] = {0xFE,0x80,0,0,0,0,0,0};
     767        2394 :     return (memcmp(ip, pchRFC4862, sizeof(pchRFC4862)) == 0);
     768             : }
     769             : 
     770           1 : bool CNetAddr::IsRFC4193() const
     771             : {
     772        2393 :     return ((GetByte(15) & 0xFE) == 0xFC);
     773             : }
     774             : 
     775           0 : bool CNetAddr::IsRFC6145() const
     776             : {
     777             :     static const unsigned char pchRFC6145[] = {0,0,0,0,0,0,0,0,0xFF,0xFF,0,0};
     778           7 :     return (memcmp(ip, pchRFC6145, sizeof(pchRFC6145)) == 0);
     779             : }
     780             : 
     781           1 : bool CNetAddr::IsRFC4843() const
     782             : {
     783        2410 :     return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10);
     784             : }
     785             : 
     786           2 : bool CNetAddr::IsTor() const
     787             : {
     788        5723 :     return (memcmp(ip, pchOnionCat, sizeof(pchOnionCat)) == 0);
     789             : }
     790             : 
     791        4389 : bool CNetAddr::IsLocal() const
     792             : {
     793             :     // IPv4 loopback
     794        8652 :    if (IsIPv4() && (GetByte(3) == 127 || GetByte(3) == 0))
     795             :        return true;
     796             : 
     797             :    // IPv6 loopback (::1/128)
     798             :    static const unsigned char pchLocal[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
     799         563 :    if (memcmp(ip, pchLocal, 16) == 0)
     800             :        return true;
     801             : 
     802         561 :    return false;
     803             : }
     804             : 
     805           0 : bool CNetAddr::IsMulticast() const
     806             : {
     807           0 :     return    (IsIPv4() && (GetByte(3) & 0xF0) == 0xE0)
     808           0 :            || (GetByte(15) == 0xFF);
     809             : }
     810             : 
     811       15030 : bool CNetAddr::IsValid() const
     812             : {
     813             :     // Cleanup 3-byte shifted addresses caused by garbage in size field
     814             :     // of addr messages from versions before 0.2.9 checksum.
     815             :     // Two consecutive addr messages look like this:
     816             :     // header20 vectorlen3 addr26 addr26 addr26 header20 vectorlen3 addr26 addr26 addr26...
     817             :     // so if the first length field is garbled, it reads the second batch
     818             :     // of addr misaligned by 3 bytes.
     819       15030 :     if (memcmp(ip, pchIPv4+3, sizeof(pchIPv4)-3) == 0)
     820             :         return false;
     821             : 
     822             :     // unspecified IPv6 address (::/128)
     823       15030 :     unsigned char ipNone[16] = {};
     824       15030 :     if (memcmp(ip, ipNone, 16) == 0)
     825             :         return false;
     826             : 
     827             :     // documentation IPv6 address
     828       10713 :     if (IsRFC3849())
     829             :         return false;
     830             : 
     831       10713 :     if (IsIPv4())
     832             :     {
     833             :         // INADDR_NONE
     834       10643 :         uint32_t ipNone = INADDR_NONE;
     835       10643 :         if (memcmp(ip+12, &ipNone, 4) == 0)
     836         916 :             return false;
     837             : 
     838             :         // 0
     839       10643 :         ipNone = 0;
     840       10643 :         if (memcmp(ip+12, &ipNone, 4) == 0)
     841             :             return false;
     842             :     }
     843             : 
     844             :     return true;
     845             : }
     846             : 
     847        3161 : bool CNetAddr::IsRoutable() const
     848             : {
     849       10347 :     return IsValid() && !(IsRFC1918() || IsRFC2544() || IsRFC3927() || IsRFC4862() || IsRFC6598() || IsRFC5737() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsLocal());
     850             : }
     851             : 
     852         322 : enum Network CNetAddr::GetNetwork() const
     853             : {
     854         322 :     if (!IsRoutable())
     855             :         return NET_UNROUTABLE;
     856             : 
     857          14 :     if (IsIPv4())
     858             :         return NET_IPV4;
     859             : 
     860           9 :     if (IsTor())
     861             :         return NET_TOR;
     862             : 
     863           5 :     return NET_IPV6;
     864             : }
     865             : 
     866        5123 : std::string CNetAddr::ToStringIP() const
     867             : {
     868        5123 :     if (IsTor())
     869           8 :         return EncodeBase32(&ip[6], 10) + ".onion";
     870             :     CService serv(*this, 0);
     871             :     struct sockaddr_storage sockaddr;
     872        5119 :     socklen_t socklen = sizeof(sockaddr);
     873        5119 :     if (serv.GetSockAddr((struct sockaddr*)&sockaddr, &socklen)) {
     874        5119 :         char name[1025] = "";
     875        5119 :         if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), NULL, 0, NI_NUMERICHOST))
     876       10238 :             return std::string(name);
     877             :     }
     878           0 :     if (IsIPv4())
     879           0 :         return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));
     880             :     else
     881             :         return strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
     882           0 :                          GetByte(15) << 8 | GetByte(14), GetByte(13) << 8 | GetByte(12),
     883           0 :                          GetByte(11) << 8 | GetByte(10), GetByte(9) << 8 | GetByte(8),
     884           0 :                          GetByte(7) << 8 | GetByte(6), GetByte(5) << 8 | GetByte(4),
     885           0 :                          GetByte(3) << 8 | GetByte(2), GetByte(1) << 8 | GetByte(0));
     886             : }
     887             : 
     888          85 : std::string CNetAddr::ToString() const
     889             : {
     890         330 :     return ToStringIP();
     891             : }
     892             : 
     893     3031328 : bool operator==(const CNetAddr& a, const CNetAddr& b)
     894             : {
     895     3031374 :     return (memcmp(a.ip, b.ip, 16) == 0);
     896             : }
     897             : 
     898           0 : bool operator!=(const CNetAddr& a, const CNetAddr& b)
     899             : {
     900          76 :     return (memcmp(a.ip, b.ip, 16) != 0);
     901             : }
     902             : 
     903        2280 : bool operator<(const CNetAddr& a, const CNetAddr& b)
     904             : {
     905        2349 :     return (memcmp(a.ip, b.ip, 16) < 0);
     906             : }
     907             : 
     908        5054 : bool CNetAddr::GetInAddr(struct in_addr* pipv4Addr) const
     909             : {
     910        5054 :     if (!IsIPv4())
     911             :         return false;
     912        5054 :     memcpy(pipv4Addr, ip+12, 4);
     913        5054 :     return true;
     914             : }
     915             : 
     916           0 : bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const
     917             : {
     918         386 :     memcpy(pipv6Addr, ip, 16);
     919           0 :     return true;
     920             : }
     921             : 
     922             : // get canonical identifier of an address' group
     923             : // no two connections will be attempted to addresses with the same group
     924        1991 : std::vector<unsigned char> CNetAddr::GetGroup() const
     925             : {
     926             :     std::vector<unsigned char> vchRet;
     927        1991 :     int nClass = NET_IPV6;
     928        1991 :     int nStartByte = 0;
     929        1991 :     int nBits = 16;
     930             : 
     931             :     // all local addresses belong to the same group
     932        1991 :     if (IsLocal())
     933             :     {
     934        1723 :         nClass = 255;
     935        1723 :         nBits = 0;
     936             :     }
     937             : 
     938             :     // all unroutable addresses belong to the same group
     939        1991 :     if (!IsRoutable())
     940             :     {
     941             :         nClass = NET_UNROUTABLE;
     942             :         nBits = 0;
     943             :     }
     944             :     // for IPv4 addresses, '1' + the 16 higher-order bits of the IP
     945             :     // includes mapped IPv4, SIIT translated IPv4, and the well-known prefix
     946         187 :     else if (IsIPv4() || IsRFC6145() || IsRFC6052())
     947             :     {
     948             :         nClass = NET_IPV4;
     949             :         nStartByte = 12;
     950             :     }
     951             :     // for 6to4 tunnelled addresses, use the encapsulated IPv4 address
     952           5 :     else if (IsRFC3964())
     953             :     {
     954             :         nClass = NET_IPV4;
     955             :         nStartByte = 2;
     956             :     }
     957             :     // for Teredo-tunnelled IPv6 addresses, use the encapsulated IPv4 address
     958           4 :     else if (IsRFC4380())
     959             :     {
     960           1 :         vchRet.push_back(NET_IPV4);
     961           1 :         vchRet.push_back(GetByte(3) ^ 0xFF);
     962           1 :         vchRet.push_back(GetByte(2) ^ 0xFF);
     963           1 :         return vchRet;
     964             :     }
     965           3 :     else if (IsTor())
     966             :     {
     967             :         nClass = NET_TOR;
     968             :         nStartByte = 6;
     969             :         nBits = 4;
     970             :     }
     971             :     // for he.net, use /36 groups
     972           7 :     else if (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x04 && GetByte(12) == 0x70)
     973             :         nBits = 36;
     974             :     // for the rest of the IPv6 network, use /32 groups
     975             :     else
     976           1 :         nBits = 32;
     977             : 
     978        1990 :     vchRet.push_back(nClass);
     979        4328 :     while (nBits >= 8)
     980             :     {
     981         696 :         vchRet.push_back(GetByte(15 - nStartByte));
     982         348 :         nStartByte++;
     983         348 :         nBits -= 8;
     984             :     }
     985        1990 :     if (nBits > 0)
     986           4 :         vchRet.push_back(GetByte(15 - nStartByte) | ((1 << (8 - nBits)) - 1));
     987             : 
     988             :     return vchRet;
     989             : }
     990             : 
     991           0 : uint64_t CNetAddr::GetHash() const
     992             : {
     993           0 :     uint256 hash = Hash(&ip[0], &ip[16]);
     994             :     uint64_t nRet;
     995             :     memcpy(&nRet, &hash, sizeof(nRet));
     996           0 :     return nRet;
     997             : }
     998             : 
     999             : // private extensions to enum Network, only returned by GetExtNetwork,
    1000             : // and only used in GetReachabilityFrom
    1001             : static const int NET_UNKNOWN = NET_MAX + 0;
    1002             : static const int NET_TEREDO  = NET_MAX + 1;
    1003           0 : int static GetExtNetwork(const CNetAddr *addr)
    1004             : {
    1005           0 :     if (addr == NULL)
    1006             :         return NET_UNKNOWN;
    1007           0 :     if (addr->IsRFC4380())
    1008             :         return NET_TEREDO;
    1009           0 :     return addr->GetNetwork();
    1010             : }
    1011             : 
    1012             : /** Calculates a metric for how reachable (*this) is from a given partner */
    1013           0 : int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const
    1014             : {
    1015             :     enum Reachability {
    1016             :         REACH_UNREACHABLE,
    1017             :         REACH_DEFAULT,
    1018             :         REACH_TEREDO,
    1019             :         REACH_IPV6_WEAK,
    1020             :         REACH_IPV4,
    1021             :         REACH_IPV6_STRONG,
    1022             :         REACH_PRIVATE
    1023             :     };
    1024             : 
    1025           0 :     if (!IsRoutable())
    1026             :         return REACH_UNREACHABLE;
    1027             : 
    1028           0 :     int ourNet = GetExtNetwork(this);
    1029           0 :     int theirNet = GetExtNetwork(paddrPartner);
    1030           0 :     bool fTunnel = IsRFC3964() || IsRFC6052() || IsRFC6145();
    1031             : 
    1032           0 :     switch(theirNet) {
    1033             :     case NET_IPV4:
    1034           0 :         switch(ourNet) {
    1035             :         default:       return REACH_DEFAULT;
    1036           0 :         case NET_IPV4: return REACH_IPV4;
    1037             :         }
    1038             :     case NET_IPV6:
    1039           0 :         switch(ourNet) {
    1040             :         default:         return REACH_DEFAULT;
    1041           0 :         case NET_TEREDO: return REACH_TEREDO;
    1042           0 :         case NET_IPV4:   return REACH_IPV4;
    1043           0 :         case NET_IPV6:   return fTunnel ? REACH_IPV6_WEAK : REACH_IPV6_STRONG; // only prefer giving our IPv6 address if it's not tunnelled
    1044             :         }
    1045             :     case NET_TOR:
    1046           0 :         switch(ourNet) {
    1047             :         default:         return REACH_DEFAULT;
    1048           0 :         case NET_IPV4:   return REACH_IPV4; // Tor users can connect to IPv4 as well
    1049           0 :         case NET_TOR:    return REACH_PRIVATE;
    1050             :         }
    1051             :     case NET_TEREDO:
    1052           0 :         switch(ourNet) {
    1053             :         default:          return REACH_DEFAULT;
    1054             :         case NET_TEREDO:  return REACH_TEREDO;
    1055             :         case NET_IPV6:    return REACH_IPV6_WEAK;
    1056             :         case NET_IPV4:    return REACH_IPV4;
    1057             :         }
    1058             :     case NET_UNKNOWN:
    1059             :     case NET_UNROUTABLE:
    1060             :     default:
    1061           0 :         switch(ourNet) {
    1062             :         default:          return REACH_DEFAULT;
    1063             :         case NET_TEREDO:  return REACH_TEREDO;
    1064             :         case NET_IPV6:    return REACH_IPV6_WEAK;
    1065             :         case NET_IPV4:    return REACH_IPV4;
    1066             :         case NET_TOR:     return REACH_PRIVATE; // either from Tor, or don't care about our address
    1067             :         }
    1068             :     }
    1069             : }
    1070             : 
    1071           0 : void CService::Init()
    1072             : {
    1073       39426 :     port = 0;
    1074           0 : }
    1075             : 
    1076       31436 : CService::CService()
    1077             : {
    1078             :     Init();
    1079       14700 : }
    1080             : 
    1081       13257 : CService::CService(const CNetAddr& cip, unsigned short portIn) : CNetAddr(cip), port(portIn)
    1082             : {
    1083           7 : }
    1084             : 
    1085         182 : CService::CService(const struct in_addr& ipv4Addr, unsigned short portIn) : CNetAddr(ipv4Addr), port(portIn)
    1086             : {
    1087          91 : }
    1088             : 
    1089         182 : CService::CService(const struct in6_addr& ipv6Addr, unsigned short portIn) : CNetAddr(ipv6Addr), port(portIn)
    1090             : {
    1091          91 : }
    1092             : 
    1093         252 : CService::CService(const struct sockaddr_in& addr) : CNetAddr(addr.sin_addr), port(ntohs(addr.sin_port))
    1094             : {
    1095         126 :     assert(addr.sin_family == AF_INET);
    1096         126 : }
    1097             : 
    1098           0 : CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr), port(ntohs(addr.sin6_port))
    1099             : {
    1100           0 :    assert(addr.sin6_family == AF_INET6);
    1101           0 : }
    1102             : 
    1103         126 : bool CService::SetSockAddr(const struct sockaddr *paddr)
    1104             : {
    1105         126 :     switch (paddr->sa_family) {
    1106             :     case AF_INET:
    1107         126 :         *this = CService(*(const struct sockaddr_in*)paddr);
    1108         126 :         return true;
    1109             :     case AF_INET6:
    1110           0 :         *this = CService(*(const struct sockaddr_in6*)paddr);
    1111           0 :         return true;
    1112             :     default:
    1113             :         return false;
    1114             :     }
    1115             : }
    1116             : 
    1117          22 : CService::CService(const char *pszIpPort, bool fAllowLookup)
    1118             : {
    1119             :     Init();
    1120             :     CService ip;
    1121          22 :     if (Lookup(pszIpPort, ip, 0, fAllowLookup))
    1122          10 :         *this = ip;
    1123          22 : }
    1124             : 
    1125        7886 : CService::CService(const char *pszIpPort, int portDefault, bool fAllowLookup)
    1126             : {
    1127             :     Init();
    1128             :     CService ip;
    1129        7886 :     if (Lookup(pszIpPort, ip, portDefault, fAllowLookup))
    1130        7886 :         *this = ip;
    1131        7886 : }
    1132             : 
    1133          77 : CService::CService(const std::string &strIpPort, bool fAllowLookup)
    1134             : {
    1135             :     Init();
    1136             :     CService ip;
    1137         154 :     if (Lookup(strIpPort.c_str(), ip, 0, fAllowLookup))
    1138          77 :         *this = ip;
    1139          77 : }
    1140             : 
    1141           5 : CService::CService(const std::string &strIpPort, int portDefault, bool fAllowLookup)
    1142             : {
    1143             :     Init();
    1144             :     CService ip;
    1145          10 :     if (Lookup(strIpPort.c_str(), ip, portDefault, fAllowLookup))
    1146           5 :         *this = ip;
    1147           5 : }
    1148             : 
    1149           0 : unsigned short CService::GetPort() const
    1150             : {
    1151          11 :     return port;
    1152             : }
    1153             : 
    1154           0 : bool operator==(const CService& a, const CService& b)
    1155             : {
    1156           0 :     return (CNetAddr)a == (CNetAddr)b && a.port == b.port;
    1157             : }
    1158             : 
    1159          76 : bool operator!=(const CService& a, const CService& b)
    1160             : {
    1161         152 :     return (CNetAddr)a != (CNetAddr)b || a.port != b.port;
    1162             : }
    1163             : 
    1164           0 : bool operator<(const CService& a, const CService& b)
    1165             : {
    1166           0 :     return (CNetAddr)a < (CNetAddr)b || ((CNetAddr)a == (CNetAddr)b && a.port < b.port);
    1167             : }
    1168             : 
    1169        5440 : bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const
    1170             : {
    1171       10880 :     if (IsIPv4()) {
    1172        5054 :         if (*addrlen < (socklen_t)sizeof(struct sockaddr_in))
    1173             :             return false;
    1174        5054 :         *addrlen = sizeof(struct sockaddr_in);
    1175        5054 :         struct sockaddr_in *paddrin = (struct sockaddr_in*)paddr;
    1176        5054 :         memset(paddrin, 0, *addrlen);
    1177        5054 :         if (!GetInAddr(&paddrin->sin_addr))
    1178             :             return false;
    1179        5054 :         paddrin->sin_family = AF_INET;
    1180        5054 :         paddrin->sin_port = htons(port);
    1181        5054 :         return true;
    1182             :     }
    1183         386 :     if (IsIPv6()) {
    1184         386 :         if (*addrlen < (socklen_t)sizeof(struct sockaddr_in6))
    1185             :             return false;
    1186         386 :         *addrlen = sizeof(struct sockaddr_in6);
    1187         386 :         struct sockaddr_in6 *paddrin6 = (struct sockaddr_in6*)paddr;
    1188         386 :         memset(paddrin6, 0, *addrlen);
    1189         386 :         if (!GetIn6Addr(&paddrin6->sin6_addr))
    1190             :             return false;
    1191         386 :         paddrin6->sin6_family = AF_INET6;
    1192         386 :         paddrin6->sin6_port = htons(port);
    1193         386 :         return true;
    1194             :     }
    1195             :     return false;
    1196             : }
    1197             : 
    1198      115185 : std::vector<unsigned char> CService::GetKey() const
    1199             : {
    1200             :      std::vector<unsigned char> vKey;
    1201      115185 :      vKey.resize(18);
    1202      115185 :      memcpy(&vKey[0], ip, 16);
    1203      115185 :      vKey[16] = port / 0x100;
    1204      115185 :      vKey[17] = port & 0x0FF;
    1205      115185 :      return vKey;
    1206             : }
    1207             : 
    1208           0 : std::string CService::ToStringPort() const
    1209             : {
    1210        4781 :     return strprintf("%u", port);
    1211             : }
    1212             : 
    1213        4781 : std::string CService::ToStringIPPort() const
    1214             : {
    1215        9661 :     if (IsIPv4() || IsTor()) {
    1216       18728 :         return ToStringIP() + ":" + ToStringPort();
    1217             :     } else {
    1218         495 :         return "[" + ToStringIP() + "]:" + ToStringPort();
    1219             :     }
    1220             : }
    1221             : 
    1222        4460 : std::string CService::ToString() const
    1223             : {
    1224        4460 :     return ToStringIPPort();
    1225             : }
    1226             : 
    1227           0 : void CService::SetPort(unsigned short portIn)
    1228             : {
    1229           0 :     port = portIn;
    1230           0 : }
    1231             : 
    1232          25 : CSubNet::CSubNet():
    1233          50 :     valid(false)
    1234             : {
    1235          25 :     memset(netmask, 0, sizeof(netmask));
    1236          25 : }
    1237             : 
    1238         274 : CSubNet::CSubNet(const std::string &strSubnet, bool fAllowLookup)
    1239             : {
    1240         274 :     size_t slash = strSubnet.find_last_of('/');
    1241             :     std::vector<CNetAddr> vIP;
    1242             : 
    1243         274 :     valid = true;
    1244             :     // Default to /32 (IPv4) or /128 (IPv6), i.e. match single address
    1245         274 :     memset(netmask, 255, sizeof(netmask));
    1246             : 
    1247         274 :     std::string strAddress = strSubnet.substr(0, slash);
    1248         548 :     if (LookupHost(strAddress.c_str(), vIP, 1, fAllowLookup))
    1249             :     {
    1250         270 :         network = vIP[0];
    1251         270 :         if (slash != strSubnet.npos)
    1252             :         {
    1253         169 :             std::string strNetmask = strSubnet.substr(slash + 1);
    1254             :             int32_t n;
    1255             :             // IPv4 addresses start at offset 12, and first 12 bytes must match, so just offset n
    1256         338 :             const int astartofs = network.IsIPv4() ? 12 : 0;
    1257         169 :             if (ParseInt32(strNetmask, &n)) // If valid number, assume /24 symtex
    1258             :             {
    1259         127 :                 if(n >= 0 && n <= (128 - astartofs*8)) // Only valid if in range of bits of address
    1260             :                 {
    1261         123 :                     n += astartofs*8;
    1262             :                     // Clear bits [n..127]
    1263        3153 :                     for (; n < 128; ++n)
    1264        3030 :                         netmask[n>>3] &= ~(1<<(7-(n&7)));
    1265             :                 }
    1266             :                 else
    1267             :                 {
    1268           4 :                     valid = false;
    1269             :                 }
    1270             :             }
    1271             :             else // If not a valid number, try full netmask syntax
    1272             :             {
    1273          42 :                 if (LookupHost(strNetmask.c_str(), vIP, 1, false)) // Never allow lookup for netmask
    1274             :                 {
    1275             :                     // Copy only the *last* four bytes in case of IPv4, the rest of the mask should stay 1's as
    1276             :                     // we don't want pchIPv4 to be part of the mask.
    1277         228 :                     for(int x=astartofs; x<16; ++x)
    1278         228 :                         netmask[x] = vIP[0].ip[x];
    1279             :                 }
    1280             :                 else
    1281             :                 {
    1282           0 :                     valid = false;
    1283             :                 }
    1284             :             }
    1285             :         }
    1286             :     }
    1287             :     else
    1288             :     {
    1289           4 :         valid = false;
    1290             :     }
    1291             : 
    1292             :     // Normalize network according to netmask
    1293        4384 :     for(int x=0; x<16; ++x)
    1294        4384 :         network.ip[x] &= netmask[x];
    1295         274 : }
    1296             : 
    1297          18 : CSubNet::CSubNet(const CNetAddr &addr):
    1298          36 :     valid(addr.IsValid())
    1299             : {
    1300          18 :     memset(netmask, 255, sizeof(netmask));
    1301          18 :     network = addr;
    1302          18 : }
    1303             : 
    1304        3589 : bool CSubNet::Match(const CNetAddr &addr) const
    1305             : {
    1306        3589 :     if (!valid || !addr.IsValid())
    1307             :         return false;
    1308       57313 :     for(int x=0; x<16; ++x)
    1309       57325 :         if ((addr.ip[x] & netmask[x]) != network.ip[x])
    1310             :             return false;
    1311             :     return true;
    1312             : }
    1313             : 
    1314         140 : static inline int NetmaskBits(uint8_t x)
    1315             : {
    1316         140 :     switch(x) {
    1317             :     case 0x00: return 0; break;
    1318           4 :     case 0x80: return 1; break;
    1319           4 :     case 0xc0: return 2; break;
    1320           6 :     case 0xe0: return 3; break;
    1321           4 :     case 0xf0: return 4; break;
    1322           4 :     case 0xf8: return 5; break;
    1323           5 :     case 0xfc: return 6; break;
    1324           5 :     case 0xfe: return 7; break;
    1325           0 :     case 0xff: return 8; break;
    1326           1 :     default: return -1; break;
    1327             :     }
    1328             : }
    1329             : 
    1330         245 : std::string CSubNet::ToString() const
    1331             : {
    1332             :     /* Parse binary 1{n}0{N-n} to see if mask can be represented as /n */
    1333         245 :     int cidr = 0;
    1334         245 :     bool valid_cidr = true;
    1335         490 :     int n = network.IsIPv4() ? 12 : 0;
    1336        2022 :     for (; n < 16 && netmask[n] == 0xff; ++n)
    1337        1777 :         cidr += 8;
    1338         245 :     if (n < 16) {
    1339         140 :         int bits = NetmaskBits(netmask[n]);
    1340         140 :         if (bits < 0)
    1341             :             valid_cidr = false;
    1342             :         else
    1343         139 :             cidr += bits;
    1344         140 :         ++n;
    1345             :     }
    1346         303 :     for (; n < 16 && valid_cidr; ++n)
    1347         303 :         if (netmask[n] != 0x00)
    1348           1 :             valid_cidr = false;
    1349             : 
    1350             :     /* Format output */
    1351             :     std::string strNetmask;
    1352         245 :     if (valid_cidr) {
    1353         486 :         strNetmask = strprintf("%u", cidr);
    1354             :     } else {
    1355           4 :         if (network.IsIPv4())
    1356           2 :             strNetmask = strprintf("%u.%u.%u.%u", netmask[12], netmask[13], netmask[14], netmask[15]);
    1357             :         else
    1358           9 :             strNetmask = strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
    1359           2 :                              netmask[0] << 8 | netmask[1], netmask[2] << 8 | netmask[3],
    1360           2 :                              netmask[4] << 8 | netmask[5], netmask[6] << 8 | netmask[7],
    1361           2 :                              netmask[8] << 8 | netmask[9], netmask[10] << 8 | netmask[11],
    1362           2 :                              netmask[12] << 8 | netmask[13], netmask[14] << 8 | netmask[15]);
    1363             :     }
    1364             : 
    1365        1225 :     return network.ToString() + "/" + strNetmask;
    1366             : }
    1367             : 
    1368          25 : bool CSubNet::IsValid() const
    1369             : {
    1370          25 :     return valid;
    1371             : }
    1372             : 
    1373           2 : bool operator==(const CSubNet& a, const CSubNet& b)
    1374             : {
    1375           4 :     return a.valid == b.valid && a.network == b.network && !memcmp(a.netmask, b.netmask, 16);
    1376             : }
    1377             : 
    1378           1 : bool operator!=(const CSubNet& a, const CSubNet& b)
    1379             : {
    1380           1 :     return !(a==b);
    1381             : }
    1382             : 
    1383          69 : bool operator<(const CSubNet& a, const CSubNet& b)
    1384             : {
    1385         138 :     return (a.network < b.network || (a.network == b.network && memcmp(a.netmask, b.netmask, 16) < 0));
    1386             : }
    1387             : 
    1388             : #ifdef WIN32
    1389             : std::string NetworkErrorString(int err)
    1390             : {
    1391             :     char buf[256];
    1392             :     buf[0] = 0;
    1393             :     if(FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,
    1394             :             NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
    1395             :             buf, sizeof(buf), NULL))
    1396             :     {
    1397             :         return strprintf("%s (%d)", buf, err);
    1398             :     }
    1399             :     else
    1400             :     {
    1401             :         return strprintf("Unknown error (%d)", err);
    1402             :     }
    1403             : }
    1404             : #else
    1405          19 : std::string NetworkErrorString(int err)
    1406             : {
    1407             :     char buf[256];
    1408          19 :     const char *s = buf;
    1409          19 :     buf[0] = 0;
    1410             :     /* Too bad there are two incompatible implementations of the
    1411             :      * thread-safe strerror. */
    1412             : #ifdef STRERROR_R_CHAR_P /* GNU variant can return a pointer outside the passed buffer */
    1413          19 :     s = strerror_r(err, buf, sizeof(buf));
    1414             : #else /* POSIX variant always returns message in buffer */
    1415             :     if (strerror_r(err, buf, sizeof(buf)))
    1416             :         buf[0] = 0;
    1417             : #endif
    1418          19 :     return strprintf("%s (%d)", s, err);
    1419             : }
    1420             : #endif
    1421             : 
    1422         810 : bool CloseSocket(SOCKET& hSocket)
    1423             : {
    1424         810 :     if (hSocket == INVALID_SOCKET)
    1425             :         return false;
    1426             : #ifdef WIN32
    1427             :     int ret = closesocket(hSocket);
    1428             : #else
    1429         447 :     int ret = close(hSocket);
    1430             : #endif
    1431         447 :     hSocket = INVALID_SOCKET;
    1432         447 :     return ret != SOCKET_ERROR;
    1433             : }
    1434             : 
    1435         321 : bool SetSocketNonBlocking(SOCKET& hSocket, bool fNonBlocking)
    1436             : {
    1437         321 :     if (fNonBlocking) {
    1438             : #ifdef WIN32
    1439             :         u_long nOne = 1;
    1440             :         if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR) {
    1441             : #else
    1442         321 :         int fFlags = fcntl(hSocket, F_GETFL, 0);
    1443         321 :         if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == SOCKET_ERROR) {
    1444             : #endif
    1445             :             CloseSocket(hSocket);
    1446             :             return false;
    1447             :         }
    1448             :     } else {
    1449             : #ifdef WIN32
    1450             :         u_long nZero = 0;
    1451             :         if (ioctlsocket(hSocket, FIONBIO, &nZero) == SOCKET_ERROR) {
    1452             : #else
    1453           0 :         int fFlags = fcntl(hSocket, F_GETFL, 0);
    1454           0 :         if (fcntl(hSocket, F_SETFL, fFlags & ~O_NONBLOCK) == SOCKET_ERROR) {
    1455             : #endif
    1456             :             CloseSocket(hSocket);
    1457             :             return false;
    1458             :         }
    1459             :     }
    1460             : 
    1461             :     return true;
    1462         288 : }

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