src/netbase.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2016 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 #include <atomic>
  20
  21 #ifndef WIN32
  22 #include <fcntl.h>
  23 #endif
  24
  25 #include <boost/algorithm/string/case_conv.hpp> // for to_lower()
  26 #include <boost/algorithm/string/predicate.hpp> // for startswith() and endswith()
  27
  28 #if !defined(HAVE_MSG_NOSIGNAL)
  29 #define MSG_NOSIGNAL 0
  30 #endif
  31
  32 // Settings
  33 static proxyType proxyInfo[NET_MAX];
  34 static proxyType nameProxy;
  35 static CCriticalSection cs_proxyInfos;
  36 int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
  37 bool fNameLookup = DEFAULT_NAME_LOOKUP;
  38
  39 // Need ample time for negotiation for very slow proxies such as Tor (milliseconds)
  40 static const int SOCKS5_RECV_TIMEOUT = 20 * 1000;
  41 static std::atomic<bool> interruptSocks5Recv(false);
  42
  43 enum Network ParseNetwork(std::string net) {
  44     boost::to_lower(net);
  45     if (net == "ipv4") return NET_IPV4;
  46     if (net == "ipv6") return NET_IPV6;
  47     if (net == "tor" || net == "onion")  return NET_TOR;
  48     return NET_UNROUTABLE;
  49 }
  50
  51 std::string GetNetworkName(enum Network net) {
  52     switch(net)
  53     {
  54     case NET_IPV4: return "ipv4";
  55     case NET_IPV6: return "ipv6";
  56     case NET_TOR: return "onion";
  57     default: return "";
  58     }
  59 }
  60
  61 bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
  62 {
  63     vIP.clear();
  64
  65     {
  66         CNetAddr addr;
  67         if (addr.SetSpecial(std::string(pszName))) {
  68             vIP.push_back(addr);
  69             return true;
  70         }
  71     }
  72
  73     struct addrinfo aiHint;
  74     memset(&aiHint, 0, sizeof(struct addrinfo));
  75
  76     aiHint.ai_socktype = SOCK_STREAM;
  77     aiHint.ai_protocol = IPPROTO_TCP;
  78     aiHint.ai_family = AF_UNSPEC;
  79 #ifdef WIN32
  80     aiHint.ai_flags = fAllowLookup ? 0 : AI_NUMERICHOST;
  81 #else
  82     aiHint.ai_flags = fAllowLookup ? AI_ADDRCONFIG : AI_NUMERICHOST;
  83 #endif
  84     struct addrinfo *aiRes = nullptr;
  85     int nErr = getaddrinfo(pszName, nullptr, &aiHint, &aiRes);
  86     if (nErr)
  87         return false;
  88
  89     struct addrinfo *aiTrav = aiRes;
  90     while (aiTrav != nullptr && (nMaxSolutions == 0 || vIP.size() < nMaxSolutions))
  91     {
  92         CNetAddr resolved;
  93         if (aiTrav->ai_family == AF_INET)
  94         {
  95             assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in));
  96             resolved = CNetAddr(((struct sockaddr_in*)(aiTrav->ai_addr))->sin_addr);
  97         }
  98
  99         if (aiTrav->ai_family == AF_INET6)
 100         {
 101             assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in6));
 102             struct sockaddr_in6* s6 = (struct sockaddr_in6*) aiTrav->ai_addr;
 103             resolved = CNetAddr(s6->sin6_addr, s6->sin6_scope_id);
 104         }
 105         /* Never allow resolving to an internal address. Consider any such result invalid */
 106         if (!resolved.IsInternal()) {
 107             vIP.push_back(resolved);
 108         }
 109
 110         aiTrav = aiTrav->ai_next;
 111     }
 112
 113     freeaddrinfo(aiRes);
 114
 115     return (vIP.size() > 0);
 116 }
 117
 118 bool LookupHost(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
 119 {
 120     std::string strHost(pszName);
 121     if (strHost.empty())
 122         return false;
 123     if (boost::algorithm::starts_with(strHost, "[") && boost::algorithm::ends_with(strHost, "]"))
 124     {
 125         strHost = strHost.substr(1, strHost.size() - 2);
 126     }
 127
 128     return LookupIntern(strHost.c_str(), vIP, nMaxSolutions, fAllowLookup);
 129 }
 130
 131 bool LookupHost(const char *pszName, CNetAddr& addr, bool fAllowLookup)
 132 {
 133     std::vector<CNetAddr> vIP;
 134     LookupHost(pszName, vIP, 1, fAllowLookup);
 135     if(vIP.empty())
 136         return false;
 137     addr = vIP.front();
 138     return true;
 139 }
 140
 141 bool Lookup(const char *pszName, std::vector<CService>& vAddr, int portDefault, bool fAllowLookup, unsigned int nMaxSolutions)
 142 {
 143     if (pszName[0] == 0)
 144         return false;
 145     int port = portDefault;
 146     std::string hostname = "";
 147     SplitHostPort(std::string(pszName), port, hostname);
 148
 149     std::vector<CNetAddr> vIP;
 150     bool fRet = LookupIntern(hostname.c_str(), vIP, nMaxSolutions, fAllowLookup);
 151     if (!fRet)
 152         return false;
 153     vAddr.resize(vIP.size());
 154     for (unsigned int i = 0; i < vIP.size(); i++)
 155         vAddr[i] = CService(vIP[i], port);
 156     return true;
 157 }
 158
 159 bool Lookup(const char *pszName, CService& addr, int portDefault, bool fAllowLookup)
 160 {
 161     std::vector<CService> vService;
 162     bool fRet = Lookup(pszName, vService, portDefault, fAllowLookup, 1);
 163     if (!fRet)
 164         return false;
 165     addr = vService[0];
 166     return true;
 167 }
 168
 169 CService LookupNumeric(const char *pszName, int portDefault)
 170 {
 171     CService addr;
 172     // "1.2:345" will fail to resolve the ip, but will still set the port.
 173     // If the ip fails to resolve, re-init the result.
 174     if(!Lookup(pszName, addr, portDefault, false))
 175         addr = CService();
 176     return addr;
 177 }
 178
 179 struct timeval MillisToTimeval(int64_t nTimeout)
 180 {
 181     struct timeval timeout;
 182     timeout.tv_sec  = nTimeout / 1000;
 183     timeout.tv_usec = (nTimeout % 1000) * 1000;
 184     return timeout;
 185 }
 186
 187 /** SOCKS version */
 188 enum SOCKSVersion: uint8_t {
 189     SOCKS4 = 0x04,
 190     SOCKS5 = 0x05
 191 };
 192
 193 /** Values defined for METHOD in RFC1928 */
 194 enum SOCKS5Method: uint8_t {
 195     NOAUTH = 0x00,        //! No authentication required
 196     GSSAPI = 0x01,        //! GSSAPI
 197     USER_PASS = 0x02,     //! Username/password
 198     NO_ACCEPTABLE = 0xff, //! No acceptable methods
 199 };
 200
 201 /** Values defined for CMD in RFC1928 */
 202 enum SOCKS5Command: uint8_t {
 203     CONNECT = 0x01,
 204     BIND = 0x02,
 205     UDP_ASSOCIATE = 0x03
 206 };
 207
 208 /** Values defined for REP in RFC1928 */
 209 enum SOCKS5Reply: uint8_t {
 210     SUCCEEDED = 0x00,        //! Succeeded
 211     GENFAILURE = 0x01,       //! General failure
 212     NOTALLOWED = 0x02,       //! Connection not allowed by ruleset
 213     NETUNREACHABLE = 0x03,   //! Network unreachable
 214     HOSTUNREACHABLE = 0x04,  //! Network unreachable
 215     CONNREFUSED = 0x05,      //! Connection refused
 216     TTLEXPIRED = 0x06,       //! TTL expired
 217     CMDUNSUPPORTED = 0x07,   //! Command not supported
 218     ATYPEUNSUPPORTED = 0x08, //! Address type not supported
 219 };
 220
 221 /** Values defined for ATYPE in RFC1928 */
 222 enum SOCKS5Atyp: uint8_t {
 223     IPV4 = 0x01,
 224     DOMAINNAME = 0x03,
 225     IPV6 = 0x04,
 226 };
 227
 228 /** Status codes that can be returned by InterruptibleRecv */
 229 enum class IntrRecvError {
 230     OK,
 231     Timeout,
 232     Disconnected,
 233     NetworkError,
 234     Interrupted
 235 };
 236
 237 /**
 238  * Read bytes from socket. This will either read the full number of bytes requested
 239  * or return False on error or timeout.
 240  * This function can be interrupted by calling InterruptSocks5()
 241  *
 242  * @param data Buffer to receive into
 243  * @param len  Length of data to receive
 244  * @param timeout  Timeout in milliseconds for receive operation
 245  *
 246  * @note This function requires that hSocket is in non-blocking mode.
 247  */
 248 static IntrRecvError InterruptibleRecv(uint8_t* data, size_t len, int timeout, const SOCKET& hSocket)
 249 {
 250     int64_t curTime = GetTimeMillis();
 251     int64_t endTime = curTime + timeout;
 252     // Maximum time to wait in one select call. It will take up until this time (in millis)
 253     // to break off in case of an interruption.
 254     const int64_t maxWait = 1000;
 255     while (len > 0 && curTime < endTime) {
 256         ssize_t ret = recv(hSocket, (char*)data, len, 0); // Optimistically try the recv first
 257         if (ret > 0) {
 258             len -= ret;
 259             data += ret;
 260         } else if (ret == 0) { // Unexpected disconnection
 261             return IntrRecvError::Disconnected;
 262         } else { // Other error or blocking
 263             int nErr = WSAGetLastError();
 264             if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL) {
 265                 if (!IsSelectableSocket(hSocket)) {
 266                     return IntrRecvError::NetworkError;
 267                 }
 268                 struct timeval tval = MillisToTimeval(std::min(endTime - curTime, maxWait));
 269                 fd_set fdset;
 270                 FD_ZERO(&fdset);
 271                 FD_SET(hSocket, &fdset);
 272                 int nRet = select(hSocket + 1, &fdset, nullptr, nullptr, &tval);
 273                 if (nRet == SOCKET_ERROR) {
 274                     return IntrRecvError::NetworkError;
 275                 }
 276             } else {
 277                 return IntrRecvError::NetworkError;
 278             }
 279         }
 280         if (interruptSocks5Recv)
 281             return IntrRecvError::Interrupted;
 282         curTime = GetTimeMillis();
 283     }
 284     return len == 0 ? IntrRecvError::OK : IntrRecvError::Timeout;
 285 }
 286
 287 /** Credentials for proxy authentication */
 288 struct ProxyCredentials
 289 {
 290     std::string username;
 291     std::string password;
 292 };
 293
 294 /** Convert SOCKS5 reply to an error message */
 295 std::string Socks5ErrorString(uint8_t err)
 296 {
 297     switch(err) {
 298         case SOCKS5Reply::GENFAILURE:
 299             return "general failure";
 300         case SOCKS5Reply::NOTALLOWED:
 301             return "connection not allowed";
 302         case SOCKS5Reply::NETUNREACHABLE:
 303             return "network unreachable";
 304         case SOCKS5Reply::HOSTUNREACHABLE:
 305             return "host unreachable";
 306         case SOCKS5Reply::CONNREFUSED:
 307             return "connection refused";
 308         case SOCKS5Reply::TTLEXPIRED:
 309             return "TTL expired";
 310         case SOCKS5Reply::CMDUNSUPPORTED:
 311             return "protocol error";
 312         case SOCKS5Reply::ATYPEUNSUPPORTED:
 313             return "address type not supported";
 314         default:
 315             return "unknown";
 316     }
 317 }
 318
 319 /** Connect using SOCKS5 (as described in RFC1928) */
 320 static bool Socks5(const std::string& strDest, int port, const ProxyCredentials *auth, SOCKET& hSocket)
 321 {
 322     IntrRecvError recvr;
 323     LogPrint(BCLog::NET, "SOCKS5 connecting %s\n", strDest);
 324     if (strDest.size() > 255) {
 325         CloseSocket(hSocket);
 326         return error("Hostname too long");
 327     }
 328     // Accepted authentication methods
 329     std::vector<uint8_t> vSocks5Init;
 330     vSocks5Init.push_back(SOCKSVersion::SOCKS5);
 331     if (auth) {
 332         vSocks5Init.push_back(0x02); // Number of methods
 333         vSocks5Init.push_back(SOCKS5Method::NOAUTH);
 334         vSocks5Init.push_back(SOCKS5Method::USER_PASS);
 335     } else {
 336         vSocks5Init.push_back(0x01); // Number of methods
 337         vSocks5Init.push_back(SOCKS5Method::NOAUTH);
 338     }
 339     ssize_t ret = send(hSocket, (const char*)vSocks5Init.data(), vSocks5Init.size(), MSG_NOSIGNAL);
 340     if (ret != (ssize_t)vSocks5Init.size()) {
 341         CloseSocket(hSocket);
 342         return error("Error sending to proxy");
 343     }
 344     uint8_t pchRet1[2];
 345     if ((recvr = InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
 346         CloseSocket(hSocket);
 347         LogPrintf("Socks5() connect to %s:%d failed: InterruptibleRecv() timeout or other failure\n", strDest, port);
 348         return false;
 349     }
 350     if (pchRet1[0] != SOCKSVersion::SOCKS5) {
 351         CloseSocket(hSocket);
 352         return error("Proxy failed to initialize");
 353     }
 354     if (pchRet1[1] == SOCKS5Method::USER_PASS && auth) {
 355         // Perform username/password authentication (as described in RFC1929)
 356         std::vector<uint8_t> vAuth;
 357         vAuth.push_back(0x01); // Current (and only) version of user/pass subnegotiation
 358         if (auth->username.size() > 255 || auth->password.size() > 255)
 359             return error("Proxy username or password too long");
 360         vAuth.push_back(auth->username.size());
 361         vAuth.insert(vAuth.end(), auth->username.begin(), auth->username.end());
 362         vAuth.push_back(auth->password.size());
 363         vAuth.insert(vAuth.end(), auth->password.begin(), auth->password.end());
 364         ret = send(hSocket, (const char*)vAuth.data(), vAuth.size(), MSG_NOSIGNAL);
 365         if (ret != (ssize_t)vAuth.size()) {
 366             CloseSocket(hSocket);
 367             return error("Error sending authentication to proxy");
 368         }
 369         LogPrint(BCLog::PROXY, "SOCKS5 sending proxy authentication %s:%s\n", auth->username, auth->password);
 370         uint8_t pchRetA[2];
 371         if ((recvr = InterruptibleRecv(pchRetA, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
 372             CloseSocket(hSocket);
 373             return error("Error reading proxy authentication response");
 374         }
 375         if (pchRetA[0] != 0x01 || pchRetA[1] != 0x00) {
 376             CloseSocket(hSocket);
 377             return error("Proxy authentication unsuccessful");
 378         }
 379     } else if (pchRet1[1] == SOCKS5Method::NOAUTH) {
 380         // Perform no authentication
 381     } else {
 382         CloseSocket(hSocket);
 383         return error("Proxy requested wrong authentication method %02x", pchRet1[1]);
 384     }
 385     std::vector<uint8_t> vSocks5;
 386     vSocks5.push_back(SOCKSVersion::SOCKS5); // VER protocol version
 387     vSocks5.push_back(SOCKS5Command::CONNECT); // CMD CONNECT
 388     vSocks5.push_back(0x00); // RSV Reserved must be 0
 389     vSocks5.push_back(SOCKS5Atyp::DOMAINNAME); // ATYP DOMAINNAME
 390     vSocks5.push_back(strDest.size()); // Length<=255 is checked at beginning of function
 391     vSocks5.insert(vSocks5.end(), strDest.begin(), strDest.end());
 392     vSocks5.push_back((port >> 8) & 0xFF);
 393     vSocks5.push_back((port >> 0) & 0xFF);
 394     ret = send(hSocket, (const char*)vSocks5.data(), vSocks5.size(), MSG_NOSIGNAL);
 395     if (ret != (ssize_t)vSocks5.size()) {
 396         CloseSocket(hSocket);
 397         return error("Error sending to proxy");
 398     }
 399     uint8_t pchRet2[4];
 400     if ((recvr = InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
 401         CloseSocket(hSocket);
 402         if (recvr == IntrRecvError::Timeout) {
 403             /* If a timeout happens here, this effectively means we timed out while connecting
 404              * to the remote node. This is very common for Tor, so do not print an
 405              * error message. */
 406             return false;
 407         } else {
 408             return error("Error while reading proxy response");
 409         }
 410     }
 411     if (pchRet2[0] != SOCKSVersion::SOCKS5) {
 412         CloseSocket(hSocket);
 413         return error("Proxy failed to accept request");
 414     }
 415     if (pchRet2[1] != SOCKS5Reply::SUCCEEDED) {
 416         // Failures to connect to a peer that are not proxy errors
 417         CloseSocket(hSocket);
 418         LogPrintf("Socks5() connect to %s:%d failed: %s\n", strDest, port, Socks5ErrorString(pchRet2[1]));
 419         return false;
 420     }
 421     if (pchRet2[2] != 0x00) { // Reserved field must be 0
 422         CloseSocket(hSocket);
 423         return error("Error: malformed proxy response");
 424     }
 425     uint8_t pchRet3[256];
 426     switch (pchRet2[3])
 427     {
 428         case SOCKS5Atyp::IPV4: recvr = InterruptibleRecv(pchRet3, 4, SOCKS5_RECV_TIMEOUT, hSocket); break;
 429         case SOCKS5Atyp::IPV6: recvr = InterruptibleRecv(pchRet3, 16, SOCKS5_RECV_TIMEOUT, hSocket); break;
 430         case SOCKS5Atyp::DOMAINNAME:
 431         {
 432             recvr = InterruptibleRecv(pchRet3, 1, SOCKS5_RECV_TIMEOUT, hSocket);
 433             if (recvr != IntrRecvError::OK) {
 434                 CloseSocket(hSocket);
 435                 return error("Error reading from proxy");
 436             }
 437             int nRecv = pchRet3[0];
 438             recvr = InterruptibleRecv(pchRet3, nRecv, SOCKS5_RECV_TIMEOUT, hSocket);
 439             break;
 440         }
 441         default: CloseSocket(hSocket); return error("Error: malformed proxy response");
 442     }
 443     if (recvr != IntrRecvError::OK) {
 444         CloseSocket(hSocket);
 445         return error("Error reading from proxy");
 446     }
 447     if ((recvr = InterruptibleRecv(pchRet3, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
 448         CloseSocket(hSocket);
 449         return error("Error reading from proxy");
 450     }
 451     LogPrint(BCLog::NET, "SOCKS5 connected %s\n", strDest);
 452     return true;
 453 }
 454
 455 bool ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRet, int nTimeout)
 456 {
 457     hSocketRet = INVALID_SOCKET;
 458
 459     struct sockaddr_storage sockaddr;
 460     socklen_t len = sizeof(sockaddr);
 461     if (!addrConnect.GetSockAddr((struct sockaddr*)&sockaddr, &len)) {
 462         LogPrintf("Cannot connect to %s: unsupported network\n", addrConnect.ToString());
 463         return false;
 464     }
 465
 466     SOCKET hSocket = socket(((struct sockaddr*)&sockaddr)->sa_family, SOCK_STREAM, IPPROTO_TCP);
 467     if (hSocket == INVALID_SOCKET)
 468         return false;
 469
 470 #ifdef SO_NOSIGPIPE
 471     int set = 1;
 472     // Different way of disabling SIGPIPE on BSD
 473     setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
 474 #endif
 475
 476     //Disable Nagle's algorithm
 477     SetSocketNoDelay(hSocket);
 478
 479     // Set to non-blocking
 480     if (!SetSocketNonBlocking(hSocket, true)) {
 481         CloseSocket(hSocket);
 482         return error("ConnectSocketDirectly: Setting socket to non-blocking failed, error %s\n", NetworkErrorString(WSAGetLastError()));
 483     }
 484
 485     if (connect(hSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR)
 486     {
 487         int nErr = WSAGetLastError();
 488         // WSAEINVAL is here because some legacy version of winsock uses it
 489         if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL)
 490         {
 491             struct timeval timeout = MillisToTimeval(nTimeout);
 492             fd_set fdset;
 493             FD_ZERO(&fdset);
 494             FD_SET(hSocket, &fdset);
 495             int nRet = select(hSocket + 1, nullptr, &fdset, nullptr, &timeout);
 496             if (nRet == 0)
 497             {
 498                 LogPrint(BCLog::NET, "connection to %s timeout\n", addrConnect.ToString());
 499                 CloseSocket(hSocket);
 500                 return false;
 501             }
 502             if (nRet == SOCKET_ERROR)
 503             {
 504                 LogPrintf("select() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
 505                 CloseSocket(hSocket);
 506                 return false;
 507             }
 508             socklen_t nRetSize = sizeof(nRet);
 509 #ifdef WIN32
 510             if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, (char*)(&nRet), &nRetSize) == SOCKET_ERROR)
 511 #else
 512             if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, &nRet, &nRetSize) == SOCKET_ERROR)
 513 #endif
 514             {
 515                 LogPrintf("getsockopt() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
 516                 CloseSocket(hSocket);
 517                 return false;
 518             }
 519             if (nRet != 0)
 520             {
 521                 LogPrintf("connect() to %s failed after select(): %s\n", addrConnect.ToString(), NetworkErrorString(nRet));
 522                 CloseSocket(hSocket);
 523                 return false;
 524             }
 525         }
 526 #ifdef WIN32
 527         else if (WSAGetLastError() != WSAEISCONN)
 528 #else
 529         else
 530 #endif
 531         {
 532             LogPrintf("connect() to %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
 533             CloseSocket(hSocket);
 534             return false;
 535         }
 536     }
 537
 538     hSocketRet = hSocket;
 539     return true;
 540 }
 541
 542 bool SetProxy(enum Network net, const proxyType &addrProxy) {
 543     assert(net >= 0 && net < NET_MAX);
 544     if (!addrProxy.IsValid())
 545         return false;
 546     LOCK(cs_proxyInfos);
 547     proxyInfo[net] = addrProxy;
 548     return true;
 549 }
 550
 551 bool GetProxy(enum Network net, proxyType &proxyInfoOut) {
 552     assert(net >= 0 && net < NET_MAX);
 553     LOCK(cs_proxyInfos);
 554     if (!proxyInfo[net].IsValid())
 555         return false;
 556     proxyInfoOut = proxyInfo[net];
 557     return true;
 558 }
 559
 560 bool SetNameProxy(const proxyType &addrProxy) {
 561     if (!addrProxy.IsValid())
 562         return false;
 563     LOCK(cs_proxyInfos);
 564     nameProxy = addrProxy;
 565     return true;
 566 }
 567
 568 bool GetNameProxy(proxyType &nameProxyOut) {
 569     LOCK(cs_proxyInfos);
 570     if(!nameProxy.IsValid())
 571         return false;
 572     nameProxyOut = nameProxy;
 573     return true;
 574 }
 575
 576 bool HaveNameProxy() {
 577     LOCK(cs_proxyInfos);
 578     return nameProxy.IsValid();
 579 }
 580
 581 bool IsProxy(const CNetAddr &addr) {
 582     LOCK(cs_proxyInfos);
 583     for (int i = 0; i < NET_MAX; i++) {
 584         if (addr == (CNetAddr)proxyInfo[i].proxy)
 585             return true;
 586     }
 587     return false;
 588 }
 589
 590 bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int port, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
 591 {
 592     SOCKET hSocket = INVALID_SOCKET;
 593     // first connect to proxy server
 594     if (!ConnectSocketDirectly(proxy.proxy, hSocket, nTimeout)) {
 595         if (outProxyConnectionFailed)
 596             *outProxyConnectionFailed = true;
 597         return false;
 598     }
 599     // do socks negotiation
 600     if (proxy.randomize_credentials) {
 601         ProxyCredentials random_auth;
 602         static std::atomic_int counter(0);
 603         random_auth.username = random_auth.password = strprintf("%i", counter++);
 604         if (!Socks5(strDest, (unsigned short)port, &random_auth, hSocket))
 605             return false;
 606     } else {
 607         if (!Socks5(strDest, (unsigned short)port, 0, hSocket))
 608             return false;
 609     }
 610
 611     hSocketRet = hSocket;
 612     return true;
 613 }
 614 bool LookupSubNet(const char* pszName, CSubNet& ret)
 615 {
 616     std::string strSubnet(pszName);
 617     size_t slash = strSubnet.find_last_of('/');
 618     std::vector<CNetAddr> vIP;
 619
 620     std::string strAddress = strSubnet.substr(0, slash);
 621     if (LookupHost(strAddress.c_str(), vIP, 1, false))
 622     {
 623         CNetAddr network = vIP[0];
 624         if (slash != strSubnet.npos)
 625         {
 626             std::string strNetmask = strSubnet.substr(slash + 1);
 627             int32_t n;
 628             // IPv4 addresses start at offset 12, and first 12 bytes must match, so just offset n
 629             if (ParseInt32(strNetmask, &n)) { // If valid number, assume /24 syntax
 630                 ret = CSubNet(network, n);
 631                 return ret.IsValid();
 632             }
 633             else // If not a valid number, try full netmask syntax
 634             {
 635                 // Never allow lookup for netmask
 636                 if (LookupHost(strNetmask.c_str(), vIP, 1, false)) {
 637                     ret = CSubNet(network, vIP[0]);
 638                     return ret.IsValid();
 639                 }
 640             }
 641         }
 642         else
 643         {
 644             ret = CSubNet(network);
 645             return ret.IsValid();
 646         }
 647     }
 648     return false;
 649 }
 650
 651 #ifdef WIN32
 652 std::string NetworkErrorString(int err)
 653 {
 654     char buf[256];
 655     buf[0] = 0;
 656     if(FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,
 657             nullptr, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
 658             buf, sizeof(buf), nullptr))
 659     {
 660         return strprintf("%s (%d)", buf, err);
 661     }
 662     else
 663     {
 664         return strprintf("Unknown error (%d)", err);
 665     }
 666 }
 667 #else
 668 std::string NetworkErrorString(int err)
 669 {
 670     char buf[256];
 671     buf[0] = 0;
 672     /* Too bad there are two incompatible implementations of the
 673      * thread-safe strerror. */
 674     const char *s;
 675 #ifdef STRERROR_R_CHAR_P /* GNU variant can return a pointer outside the passed buffer */
 676     s = strerror_r(err, buf, sizeof(buf));
 677 #else /* POSIX variant always returns message in buffer */
 678     s = buf;
 679     if (strerror_r(err, buf, sizeof(buf)))
 680         buf[0] = 0;
 681 #endif
 682     return strprintf("%s (%d)", s, err);
 683 }
 684 #endif
 685
 686 bool CloseSocket(SOCKET& hSocket)
 687 {
 688     if (hSocket == INVALID_SOCKET)
 689         return false;
 690 #ifdef WIN32
 691     int ret = closesocket(hSocket);
 692 #else
 693     int ret = close(hSocket);
 694 #endif
 695     hSocket = INVALID_SOCKET;
 696     return ret != SOCKET_ERROR;
 697 }
 698
 699 bool SetSocketNonBlocking(const SOCKET& hSocket, bool fNonBlocking)
 700 {
 701     if (fNonBlocking) {
 702 #ifdef WIN32
 703         u_long nOne = 1;
 704         if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR) {
 705 #else
 706         int fFlags = fcntl(hSocket, F_GETFL, 0);
 707         if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == SOCKET_ERROR) {
 708 #endif
 709             return false;
 710         }
 711     } else {
 712 #ifdef WIN32
 713         u_long nZero = 0;
 714         if (ioctlsocket(hSocket, FIONBIO, &nZero) == SOCKET_ERROR) {
 715 #else
 716         int fFlags = fcntl(hSocket, F_GETFL, 0);
 717         if (fcntl(hSocket, F_SETFL, fFlags & ~O_NONBLOCK) == SOCKET_ERROR) {
 718 #endif
 719             return false;
 720         }
 721     }
 722
 723     return true;
 724 }
 725
 726 bool SetSocketNoDelay(const SOCKET& hSocket)
 727 {
 728     int set = 1;
 729     int rc = setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&set, sizeof(int));
 730     return rc == 0;
 731 }
 732
 733 void InterruptSocks5(bool interrupt)
 734 {
 735     interruptSocks5Recv = interrupt;
 736 }