src/netbase.cpp

   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 static proxyType proxyInfo[NET_MAX];
  40 static proxyType nameProxy;
  41 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 enum Network ParseNetwork(std::string net) {
  51     boost::to_lower(net);
  52     if (net == "ipv4") return NET_IPV4;
  53     if (net == "ipv6") return NET_IPV6;
  54     if (net == "tor" || net == "onion")  return NET_TOR;
  55     return NET_UNROUTABLE;
  56 }
  57
  58 std::string GetNetworkName(enum Network net) {
  59     switch(net)
  60     {
  61     case NET_IPV4: return "ipv4";
  62     case NET_IPV6: return "ipv6";
  63     case NET_TOR: return "onion";
  64     default: return "";
  65     }
  66 }
  67
  68 void SplitHostPort(std::string in, int &portOut, std::string &hostOut) {
  69     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     bool fHaveColon = colon != in.npos;
  72     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     bool fMultiColon = fHaveColon && (in.find_last_of(':',colon-1) != in.npos);
  74     if (fHaveColon && (colon==0 || fBracketed || !fMultiColon)) {
  75         int32_t n;
  76         if (ParseInt32(in.substr(colon + 1), &n) && n > 0 && n < 0x10000) {
  77             in = in.substr(0, colon);
  78             portOut = n;
  79         }
  80     }
  81     if (in.size()>0 && in[0] == '[' && in[in.size()-1] == ']')
  82         hostOut = in.substr(1, in.size()-2);
  83     else
  84         hostOut = in;
  85 }
  86
  87 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         if (addr.SetSpecial(std::string(pszName))) {
  94             vIP.push_back(addr);
  95             return true;
  96         }
  97     }
  98
  99 #ifdef HAVE_GETADDRINFO_A
 100     struct in_addr ipv4_addr;
 101 #ifdef HAVE_INET_PTON
 102     if (inet_pton(AF_INET, pszName, &ipv4_addr) > 0) {
 103         vIP.push_back(CNetAddr(ipv4_addr));
 104         return true;
 105     }
 106
 107     struct in6_addr ipv6_addr;
 108     if (inet_pton(AF_INET6, pszName, &ipv6_addr) > 0) {
 109         vIP.push_back(CNetAddr(ipv6_addr));
 110         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     aiHint.ai_socktype = SOCK_STREAM;
 124     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     aiHint.ai_flags = fAllowLookup ? AI_ADDRCONFIG : AI_NUMERICHOST;
 130 #endif
 131
 132     struct addrinfo *aiRes = NULL;
 133 #ifdef HAVE_GETADDRINFO_A
 134     struct gaicb gcb, *query = &gcb;
 135     memset(query, 0, sizeof(struct gaicb));
 136     gcb.ar_name = pszName;
 137     gcb.ar_request = &aiHint;
 138     int nErr = getaddrinfo_a(GAI_NOWAIT, &query, 1, NULL);
 139     if (nErr)
 140         return false;
 141
 142     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         struct timespec ts = { 2, 0 };
 148         gai_suspend(&query, 1, &ts);
 149         boost::this_thread::interruption_point();
 150
 151         nErr = gai_error(query);
 152         if (0 == nErr)
 153             aiRes = query->ar_result;
 154     } while (nErr == EAI_INPROGRESS);
 155 #else
 156     int nErr = getaddrinfo(pszName, NULL, &aiHint, &aiRes);
 157 #endif
 158     if (nErr)
 159         return false;
 160
 161     struct addrinfo *aiTrav = aiRes;
 162     while (aiTrav != NULL && (nMaxSolutions == 0 || vIP.size() < nMaxSolutions))
 163     {
 164         if (aiTrav->ai_family == AF_INET)
 165         {
 166             assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in));
 167             vIP.push_back(CNetAddr(((struct sockaddr_in*)(aiTrav->ai_addr))->sin_addr));
 168         }
 169
 170         if (aiTrav->ai_family == AF_INET6)
 171         {
 172             assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in6));
 173             vIP.push_back(CNetAddr(((struct sockaddr_in6*)(aiTrav->ai_addr))->sin6_addr));
 174         }
 175
 176         aiTrav = aiTrav->ai_next;
 177     }
 178
 179     freeaddrinfo(aiRes);
 180
 181     return (vIP.size() > 0);
 182 }
 183
 184 bool LookupHost(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
 185 {
 186     std::string strHost(pszName);
 187     if (strHost.empty())
 188         return false;
 189     if (boost::algorithm::starts_with(strHost, "[") && boost::algorithm::ends_with(strHost, "]"))
 190     {
 191         strHost = strHost.substr(1, strHost.size() - 2);
 192     }
 193
 194     return LookupIntern(strHost.c_str(), vIP, nMaxSolutions, fAllowLookup);
 195 }
 196
 197 bool Lookup(const char *pszName, std::vector<CService>& vAddr, int portDefault, bool fAllowLookup, unsigned int nMaxSolutions)
 198 {
 199     if (pszName[0] == 0)
 200         return false;
 201     int port = portDefault;
 202     std::string hostname = "";
 203     SplitHostPort(std::string(pszName), port, hostname);
 204
 205     std::vector<CNetAddr> vIP;
 206     bool fRet = LookupIntern(hostname.c_str(), vIP, nMaxSolutions, fAllowLookup);
 207     if (!fRet)
 208         return false;
 209     vAddr.resize(vIP.size());
 210     for (unsigned int i = 0; i < vIP.size(); i++)
 211         vAddr[i] = CService(vIP[i], port);
 212     return true;
 213 }
 214
 215 bool Lookup(const char *pszName, CService& addr, int portDefault, bool fAllowLookup)
 216 {
 217     std::vector<CService> vService;
 218     bool fRet = Lookup(pszName, vService, portDefault, fAllowLookup, 1);
 219     if (!fRet)
 220         return false;
 221     addr = vService[0];
 222     return true;
 223 }
 224
 225 bool LookupNumeric(const char *pszName, CService& addr, int portDefault)
 226 {
 227     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     timeout.tv_sec  = nTimeout / 1000;
 237     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 bool static InterruptibleRecv(char* data, size_t len, int timeout, SOCKET& hSocket)
 253 {
 254     int64_t curTime = GetTimeMillis();
 255     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     const int64_t maxWait = 1000;
 259     while (len > 0 && curTime < endTime) {
 260         ssize_t ret = recv(hSocket, data, len, 0); // Optimistically try the recv first
 261         if (ret > 0) {
 262             len -= ret;
 263             data += ret;
 264         } else if (ret == 0) { // Unexpected disconnection
 265             return false;
 266         } else { // Other error or blocking
 267             int nErr = WSAGetLastError();
 268             if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL) {
 269                 if (!IsSelectableSocket(hSocket)) {
 270                     return false;
 271                 }
 272                 struct timeval tval = MillisToTimeval(std::min(endTime - curTime, maxWait));
 273                 fd_set fdset;
 274                 FD_ZERO(&fdset);
 275                 FD_SET(hSocket, &fdset);
 276                 int nRet = select(hSocket + 1, &fdset, NULL, NULL, &tval);
 277                 if (nRet == SOCKET_ERROR) {
 278                     return false;
 279                 }
 280             } else {
 281                 return false;
 282             }
 283         }
 284         boost::this_thread::interruption_point();
 285         curTime = GetTimeMillis();
 286     }
 287     return len == 0;
 288 }
 289
 290 struct ProxyCredentials
 291 {
 292     std::string username;
 293     std::string password;
 294 };
 295
 296 /** Connect using SOCKS5 (as described in RFC1928) */
 297 static bool Socks5(const std::string& strDest, int port, const ProxyCredentials *auth, SOCKET& hSocket)
 298 {
 299     LogPrintf("SOCKS5 connecting %s\n", strDest);
 300     if (strDest.size() > 255) {
 301         CloseSocket(hSocket);
 302         return error("Hostname too long");
 303     }
 304     // Accepted authentication methods
 305     std::vector<uint8_t> vSocks5Init;
 306     vSocks5Init.push_back(0x05);
 307     if (auth) {
 308         vSocks5Init.push_back(0x02); // # METHODS
 309         vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
 310         vSocks5Init.push_back(0x02); // X'02' USERNAME/PASSWORD (RFC1929)
 311     } else {
 312         vSocks5Init.push_back(0x01); // # METHODS
 313         vSocks5Init.push_back(0x00); // X'00' NO AUTHENTICATION REQUIRED
 314     }
 315     ssize_t ret = send(hSocket, (const char*)begin_ptr(vSocks5Init), vSocks5Init.size(), MSG_NOSIGNAL);
 316     if (ret != (ssize_t)vSocks5Init.size()) {
 317         CloseSocket(hSocket);
 318         return error("Error sending to proxy");
 319     }
 320     char pchRet1[2];
 321     if (!InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
 322         CloseSocket(hSocket);
 323         return error("Error reading proxy response");
 324     }
 325     if (pchRet1[0] != 0x05) {
 326         CloseSocket(hSocket);
 327         return error("Proxy failed to initialize");
 328     }
 329     if (pchRet1[1] == 0x02 && auth) {
 330         // Perform username/password authentication (as described in RFC1929)
 331         std::vector<uint8_t> vAuth;
 332         vAuth.push_back(0x01);
 333         if (auth->username.size() > 255 || auth->password.size() > 255)
 334             return error("Proxy username or password too long");
 335         vAuth.push_back(auth->username.size());
 336         vAuth.insert(vAuth.end(), auth->username.begin(), auth->username.end());
 337         vAuth.push_back(auth->password.size());
 338         vAuth.insert(vAuth.end(), auth->password.begin(), auth->password.end());
 339         ret = send(hSocket, (const char*)begin_ptr(vAuth), vAuth.size(), MSG_NOSIGNAL);
 340         if (ret != (ssize_t)vAuth.size()) {
 341             CloseSocket(hSocket);
 342             return error("Error sending authentication to proxy");
 343         }
 344         LogPrint("proxy", "SOCKS5 sending proxy authentication %s:%s\n", auth->username, auth->password);
 345         char pchRetA[2];
 346         if (!InterruptibleRecv(pchRetA, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
 347             CloseSocket(hSocket);
 348             return error("Error reading proxy authentication response");
 349         }
 350         if (pchRetA[0] != 0x01 || pchRetA[1] != 0x00) {
 351             CloseSocket(hSocket);
 352             return error("Proxy authentication unsuccessful");
 353         }
 354     } else if (pchRet1[1] == 0x00) {
 355         // Perform no authentication
 356     } else {
 357         CloseSocket(hSocket);
 358         return error("Proxy requested wrong authentication method %02x", pchRet1[1]);
 359     }
 360     std::vector<uint8_t> vSocks5;
 361     vSocks5.push_back(0x05); // VER protocol version
 362     vSocks5.push_back(0x01); // CMD CONNECT
 363     vSocks5.push_back(0x00); // RSV Reserved
 364     vSocks5.push_back(0x03); // ATYP DOMAINNAME
 365     vSocks5.push_back(strDest.size()); // Length<=255 is checked at beginning of function
 366     vSocks5.insert(vSocks5.end(), strDest.begin(), strDest.end());
 367     vSocks5.push_back((port >> 8) & 0xFF);
 368     vSocks5.push_back((port >> 0) & 0xFF);
 369     ret = send(hSocket, (const char*)begin_ptr(vSocks5), vSocks5.size(), MSG_NOSIGNAL);
 370     if (ret != (ssize_t)vSocks5.size()) {
 371         CloseSocket(hSocket);
 372         return error("Error sending to proxy");
 373     }
 374     char pchRet2[4];
 375     if (!InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket)) {
 376         CloseSocket(hSocket);
 377         return error("Error reading proxy response");
 378     }
 379     if (pchRet2[0] != 0x05) {
 380         CloseSocket(hSocket);
 381         return error("Proxy failed to accept request");
 382     }
 383     if (pchRet2[1] != 0x00) {
 384         CloseSocket(hSocket);
 385         switch (pchRet2[1])
 386         {
 387             case 0x01: return error("Proxy error: general failure");
 388             case 0x02: return error("Proxy error: connection not allowed");
 389             case 0x03: return error("Proxy error: network unreachable");
 390             case 0x04: return error("Proxy error: host unreachable");
 391             case 0x05: return error("Proxy error: connection refused");
 392             case 0x06: return error("Proxy error: TTL expired");
 393             case 0x07: return error("Proxy error: protocol error");
 394             case 0x08: return error("Proxy error: address type not supported");
 395             default:   return error("Proxy error: unknown");
 396         }
 397     }
 398     if (pchRet2[2] != 0x00) {
 399         CloseSocket(hSocket);
 400         return error("Error: malformed proxy response");
 401     }
 402     char pchRet3[256];
 403     switch (pchRet2[3])
 404     {
 405         case 0x01: ret = InterruptibleRecv(pchRet3, 4, SOCKS5_RECV_TIMEOUT, hSocket); break;
 406         case 0x04: ret = InterruptibleRecv(pchRet3, 16, SOCKS5_RECV_TIMEOUT, hSocket); break;
 407         case 0x03:
 408         {
 409             ret = InterruptibleRecv(pchRet3, 1, SOCKS5_RECV_TIMEOUT, hSocket);
 410             if (!ret) {
 411                 CloseSocket(hSocket);
 412                 return error("Error reading from proxy");
 413             }
 414             int nRecv = pchRet3[0];
 415             ret = InterruptibleRecv(pchRet3, nRecv, SOCKS5_RECV_TIMEOUT, hSocket);
 416             break;
 417         }
 418         default: CloseSocket(hSocket); return error("Error: malformed proxy response");
 419     }
 420     if (!ret) {
 421         CloseSocket(hSocket);
 422         return error("Error reading from proxy");
 423     }
 424     if (!InterruptibleRecv(pchRet3, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
 425         CloseSocket(hSocket);
 426         return error("Error reading from proxy");
 427     }
 428     LogPrintf("SOCKS5 connected %s\n", strDest);
 429     return true;
 430 }
 431
 432 bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRet, int nTimeout)
 433 {
 434     hSocketRet = INVALID_SOCKET;
 435
 436     struct sockaddr_storage sockaddr;
 437     socklen_t len = sizeof(sockaddr);
 438     if (!addrConnect.GetSockAddr((struct sockaddr*)&sockaddr, &len)) {
 439         LogPrintf("Cannot connect to %s: unsupported network\n", addrConnect.ToString());
 440         return false;
 441     }
 442
 443     SOCKET hSocket = socket(((struct sockaddr*)&sockaddr)->sa_family, SOCK_STREAM, IPPROTO_TCP);
 444     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     if (!SetSocketNonBlocking(hSocket, true))
 455         return error("ConnectSocketDirectly: Setting socket to non-blocking failed, error %s\n", NetworkErrorString(WSAGetLastError()));
 456
 457     if (connect(hSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR)
 458     {
 459         int nErr = WSAGetLastError();
 460         // WSAEINVAL is here because some legacy version of winsock uses it
 461         if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL)
 462         {
 463             struct timeval timeout = MillisToTimeval(nTimeout);
 464             fd_set fdset;
 465             FD_ZERO(&fdset);
 466             FD_SET(hSocket, &fdset);
 467             int nRet = select(hSocket + 1, NULL, &fdset, NULL, &timeout);
 468             if (nRet == 0)
 469             {
 470                 LogPrint("net", "connection to %s timeout\n", addrConnect.ToString());
 471                 CloseSocket(hSocket);
 472                 return false;
 473             }
 474             if (nRet == SOCKET_ERROR)
 475             {
 476                 LogPrintf("select() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
 477                 CloseSocket(hSocket);
 478                 return false;
 479             }
 480             socklen_t nRetSize = sizeof(nRet);
 481 #ifdef WIN32
 482             if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, (char*)(&nRet), &nRetSize) == SOCKET_ERROR)
 483 #else
 484             if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, &nRet, &nRetSize) == SOCKET_ERROR)
 485 #endif
 486             {
 487                 LogPrintf("getsockopt() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
 488                 CloseSocket(hSocket);
 489                 return false;
 490             }
 491             if (nRet != 0)
 492             {
 493                 LogPrintf("connect() to %s failed after select(): %s\n", addrConnect.ToString(), NetworkErrorString(nRet));
 494                 CloseSocket(hSocket);
 495                 return false;
 496             }
 497         }
 498 #ifdef WIN32
 499         else if (WSAGetLastError() != WSAEISCONN)
 500 #else
 501         else
 502 #endif
 503         {
 504             LogPrintf("connect() to %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
 505             CloseSocket(hSocket);
 506             return false;
 507         }
 508     }
 509
 510     hSocketRet = hSocket;
 511     return true;
 512 }
 513
 514 bool SetProxy(enum Network net, const proxyType &addrProxy) {
 515     assert(net >= 0 && net < NET_MAX);
 516     if (!addrProxy.IsValid())
 517         return false;
 518     LOCK(cs_proxyInfos);
 519     proxyInfo[net] = addrProxy;
 520     return true;
 521 }
 522
 523 bool GetProxy(enum Network net, proxyType &proxyInfoOut) {
 524     assert(net >= 0 && net < NET_MAX);
 525     LOCK(cs_proxyInfos);
 526     if (!proxyInfo[net].IsValid())
 527         return false;
 528     proxyInfoOut = proxyInfo[net];
 529     return true;
 530 }
 531
 532 bool SetNameProxy(const proxyType &addrProxy) {
 533     if (!addrProxy.IsValid())
 534         return false;
 535     LOCK(cs_proxyInfos);
 536     nameProxy = addrProxy;
 537     return true;
 538 }
 539
 540 bool GetNameProxy(proxyType &nameProxyOut) {
 541     LOCK(cs_proxyInfos);
 542     if(!nameProxy.IsValid())
 543         return false;
 544     nameProxyOut = nameProxy;
 545     return true;
 546 }
 547
 548 bool HaveNameProxy() {
 549     LOCK(cs_proxyInfos);
 550     return nameProxy.IsValid();
 551 }
 552
 553 bool IsProxy(const CNetAddr &addr) {
 554     LOCK(cs_proxyInfos);
 555     for (int i = 0; i < NET_MAX; i++) {
 556         if (addr == (CNetAddr)proxyInfo[i].proxy)
 557             return true;
 558     }
 559     return false;
 560 }
 561
 562 static bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int port, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
 563 {
 564     SOCKET hSocket = INVALID_SOCKET;
 565     // first connect to proxy server
 566     if (!ConnectSocketDirectly(proxy.proxy, hSocket, nTimeout)) {
 567         if (outProxyConnectionFailed)
 568             *outProxyConnectionFailed = true;
 569         return false;
 570     }
 571     // do socks negotiation
 572     if (proxy.randomize_credentials) {
 573         ProxyCredentials random_auth;
 574         random_auth.username = strprintf("%i", insecure_rand());
 575         random_auth.password = strprintf("%i", insecure_rand());
 576         if (!Socks5(strDest, (unsigned short)port, &random_auth, hSocket))
 577             return false;
 578     } else {
 579         if (!Socks5(strDest, (unsigned short)port, 0, hSocket))
 580             return false;
 581     }
 582
 583     hSocketRet = hSocket;
 584     return true;
 585 }
 586
 587 bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed)
 588 {
 589     proxyType proxy;
 590     if (outProxyConnectionFailed)
 591         *outProxyConnectionFailed = false;
 592
 593     if (GetProxy(addrDest.GetNetwork(), proxy))
 594         return ConnectThroughProxy(proxy, addrDest.ToStringIP(), addrDest.GetPort(), hSocketRet, nTimeout, outProxyConnectionFailed);
 595     else // no proxy needed (none set for target network)
 596         return ConnectSocketDirectly(addrDest, hSocketRet, nTimeout);
 597 }
 598
 599 bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest, int portDefault, int nTimeout, bool *outProxyConnectionFailed)
 600 {
 601     std::string strDest;
 602     int port = portDefault;
 603
 604     if (outProxyConnectionFailed)
 605         *outProxyConnectionFailed = false;
 606
 607     SplitHostPort(std::string(pszDest), port, strDest);
 608
 609     proxyType nameProxy;
 610     GetNameProxy(nameProxy);
 611
 612     CService addrResolved(CNetAddr(strDest, fNameLookup && !HaveNameProxy()), port);
 613     if (addrResolved.IsValid()) {
 614         addr = addrResolved;
 615         return ConnectSocket(addr, hSocketRet, nTimeout);
 616     }
 617
 618     addr = CService("0.0.0.0:0");
 619
 620     if (!HaveNameProxy())
 621         return false;
 622     return ConnectThroughProxy(nameProxy, strDest, port, hSocketRet, nTimeout, outProxyConnectionFailed);
 623 }
 624
 625 void CNetAddr::Init()
 626 {
 627     memset(ip, 0, sizeof(ip));
 628 }
 629
 630 void CNetAddr::SetIP(const CNetAddr& ipIn)
 631 {
 632     memcpy(ip, ipIn.ip, sizeof(ip));
 633 }
 634
 635 void CNetAddr::SetRaw(Network network, const uint8_t *ip_in)
 636 {
 637     switch(network)
 638     {
 639         case NET_IPV4:
 640             memcpy(ip, pchIPv4, 12);
 641             memcpy(ip+12, ip_in, 4);
 642             break;
 643         case NET_IPV6:
 644             memcpy(ip, ip_in, 16);
 645             break;
 646         default:
 647             assert(!"invalid network");
 648     }
 649 }
 650
 651 static const unsigned char pchOnionCat[] = {0xFD,0x87,0xD8,0x7E,0xEB,0x43};
 652
 653 bool CNetAddr::SetSpecial(const std::string &strName)
 654 {
 655     if (strName.size()>6 && strName.substr(strName.size() - 6, 6) == ".onion") {
 656         std::vector<unsigned char> vchAddr = DecodeBase32(strName.substr(0, strName.size() - 6).c_str());
 657         if (vchAddr.size() != 16-sizeof(pchOnionCat))
 658             return false;
 659         memcpy(ip, pchOnionCat, sizeof(pchOnionCat));
 660         for (unsigned int i=0; i<16-sizeof(pchOnionCat); i++)
 661             ip[i + sizeof(pchOnionCat)] = vchAddr[i];
 662         return true;
 663     }
 664     return false;
 665 }
 666
 667 CNetAddr::CNetAddr()
 668 {
 669     Init();
 670 }
 671
 672 CNetAddr::CNetAddr(const struct in_addr& ipv4Addr)
 673 {
 674     SetRaw(NET_IPV4, (const uint8_t*)&ipv4Addr);
 675 }
 676
 677 CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr)
 678 {
 679     SetRaw(NET_IPV6, (const uint8_t*)&ipv6Addr);
 680 }
 681
 682 CNetAddr::CNetAddr(const char *pszIp, bool fAllowLookup)
 683 {
 684     Init();
 685     std::vector<CNetAddr> vIP;
 686     if (LookupHost(pszIp, vIP, 1, fAllowLookup))
 687         *this = vIP[0];
 688 }
 689
 690 CNetAddr::CNetAddr(const std::string &strIp, bool fAllowLookup)
 691 {
 692     Init();
 693     std::vector<CNetAddr> vIP;
 694     if (LookupHost(strIp.c_str(), vIP, 1, fAllowLookup))
 695         *this = vIP[0];
 696 }
 697
 698 unsigned int CNetAddr::GetByte(int n) const
 699 {
 700     return ip[15-n];
 701 }
 702
 703 bool CNetAddr::IsIPv4() const
 704 {
 705     return (memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0);
 706 }
 707
 708 bool CNetAddr::IsIPv6() const
 709 {
 710     return (!IsIPv4() && !IsTor());
 711 }
 712
 713 bool CNetAddr::IsRFC1918() const
 714 {
 715     return IsIPv4() && (
 716         GetByte(3) == 10 ||
 717         (GetByte(3) == 192 && GetByte(2) == 168) ||
 718         (GetByte(3) == 172 && (GetByte(2) >= 16 && GetByte(2) <= 31)));
 719 }
 720
 721 bool CNetAddr::IsRFC2544() const
 722 {
 723     return IsIPv4() && GetByte(3) == 198 && (GetByte(2) == 18 || GetByte(2) == 19);
 724 }
 725
 726 bool CNetAddr::IsRFC3927() const
 727 {
 728     return IsIPv4() && (GetByte(3) == 169 && GetByte(2) == 254);
 729 }
 730
 731 bool CNetAddr::IsRFC6598() const
 732 {
 733     return IsIPv4() && GetByte(3) == 100 && GetByte(2) >= 64 && GetByte(2) <= 127;
 734 }
 735
 736 bool CNetAddr::IsRFC5737() const
 737 {
 738     return IsIPv4() && ((GetByte(3) == 192 && GetByte(2) == 0 && GetByte(1) == 2) ||
 739         (GetByte(3) == 198 && GetByte(2) == 51 && GetByte(1) == 100) ||
 740         (GetByte(3) == 203 && GetByte(2) == 0 && GetByte(1) == 113));
 741 }
 742
 743 bool CNetAddr::IsRFC3849() const
 744 {
 745     return GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x0D && GetByte(12) == 0xB8;
 746 }
 747
 748 bool CNetAddr::IsRFC3964() const
 749 {
 750     return (GetByte(15) == 0x20 && GetByte(14) == 0x02);
 751 }
 752
 753 bool CNetAddr::IsRFC6052() const
 754 {
 755     static const unsigned char pchRFC6052[] = {0,0x64,0xFF,0x9B,0,0,0,0,0,0,0,0};
 756     return (memcmp(ip, pchRFC6052, sizeof(pchRFC6052)) == 0);
 757 }
 758
 759 bool CNetAddr::IsRFC4380() const
 760 {
 761     return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0 && GetByte(12) == 0);
 762 }
 763
 764 bool CNetAddr::IsRFC4862() const
 765 {
 766     static const unsigned char pchRFC4862[] = {0xFE,0x80,0,0,0,0,0,0};
 767     return (memcmp(ip, pchRFC4862, sizeof(pchRFC4862)) == 0);
 768 }
 769
 770 bool CNetAddr::IsRFC4193() const
 771 {
 772     return ((GetByte(15) & 0xFE) == 0xFC);
 773 }
 774
 775 bool CNetAddr::IsRFC6145() const
 776 {
 777     static const unsigned char pchRFC6145[] = {0,0,0,0,0,0,0,0,0xFF,0xFF,0,0};
 778     return (memcmp(ip, pchRFC6145, sizeof(pchRFC6145)) == 0);
 779 }
 780
 781 bool CNetAddr::IsRFC4843() const
 782 {
 783     return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10);
 784 }
 785
 786 bool CNetAddr::IsTor() const
 787 {
 788     return (memcmp(ip, pchOnionCat, sizeof(pchOnionCat)) == 0);
 789 }
 790
 791 bool CNetAddr::IsLocal() const
 792 {
 793     // IPv4 loopback
 794    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    if (memcmp(ip, pchLocal, 16) == 0)
 800        return true;
 801
 802    return false;
 803 }
 804
 805 bool CNetAddr::IsMulticast() const
 806 {
 807     return    (IsIPv4() && (GetByte(3) & 0xF0) == 0xE0)
 808            || (GetByte(15) == 0xFF);
 809 }
 810
 811 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     if (memcmp(ip, pchIPv4+3, sizeof(pchIPv4)-3) == 0)
 820         return false;
 821
 822     // unspecified IPv6 address (::/128)
 823     unsigned char ipNone[16] = {};
 824     if (memcmp(ip, ipNone, 16) == 0)
 825         return false;
 826
 827     // documentation IPv6 address
 828     if (IsRFC3849())
 829         return false;
 830
 831     if (IsIPv4())
 832     {
 833         // INADDR_NONE
 834         uint32_t ipNone = INADDR_NONE;
 835         if (memcmp(ip+12, &ipNone, 4) == 0)
 836             return false;
 837
 838         // 0
 839         ipNone = 0;
 840         if (memcmp(ip+12, &ipNone, 4) == 0)
 841             return false;
 842     }
 843
 844     return true;
 845 }
 846
 847 bool CNetAddr::IsRoutable() const
 848 {
 849     return IsValid() && !(IsRFC1918() || IsRFC2544() || IsRFC3927() || IsRFC4862() || IsRFC6598() || IsRFC5737() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsLocal());
 850 }
 851
 852 enum Network CNetAddr::GetNetwork() const
 853 {
 854     if (!IsRoutable())
 855         return NET_UNROUTABLE;
 856
 857     if (IsIPv4())
 858         return NET_IPV4;
 859
 860     if (IsTor())
 861         return NET_TOR;
 862
 863     return NET_IPV6;
 864 }
 865
 866 std::string CNetAddr::ToStringIP() const
 867 {
 868     if (IsTor())
 869         return EncodeBase32(&ip[6], 10) + ".onion";
 870     CService serv(*this, 0);
 871     struct sockaddr_storage sockaddr;
 872     socklen_t socklen = sizeof(sockaddr);
 873     if (serv.GetSockAddr((struct sockaddr*)&sockaddr, &socklen)) {
 874         char name[1025] = "";
 875         if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), NULL, 0, NI_NUMERICHOST))
 876             return std::string(name);
 877     }
 878     if (IsIPv4())
 879         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                          GetByte(15) << 8 | GetByte(14), GetByte(13) << 8 | GetByte(12),
 883                          GetByte(11) << 8 | GetByte(10), GetByte(9) << 8 | GetByte(8),
 884                          GetByte(7) << 8 | GetByte(6), GetByte(5) << 8 | GetByte(4),
 885                          GetByte(3) << 8 | GetByte(2), GetByte(1) << 8 | GetByte(0));
 886 }
 887
 888 std::string CNetAddr::ToString() const
 889 {
 890     return ToStringIP();
 891 }
 892
 893 bool operator==(const CNetAddr& a, const CNetAddr& b)
 894 {
 895     return (memcmp(a.ip, b.ip, 16) == 0);
 896 }
 897
 898 bool operator!=(const CNetAddr& a, const CNetAddr& b)
 899 {
 900     return (memcmp(a.ip, b.ip, 16) != 0);
 901 }
 902
 903 bool operator<(const CNetAddr& a, const CNetAddr& b)
 904 {
 905     return (memcmp(a.ip, b.ip, 16) < 0);
 906 }
 907
 908 bool CNetAddr::GetInAddr(struct in_addr* pipv4Addr) const
 909 {
 910     if (!IsIPv4())
 911         return false;
 912     memcpy(pipv4Addr, ip+12, 4);
 913     return true;
 914 }
 915
 916 bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const
 917 {
 918     memcpy(pipv6Addr, ip, 16);
 919     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 std::vector<unsigned char> CNetAddr::GetGroup() const
 925 {
 926     std::vector<unsigned char> vchRet;
 927     int nClass = NET_IPV6;
 928     int nStartByte = 0;
 929     int nBits = 16;
 930
 931     // all local addresses belong to the same group
 932     if (IsLocal())
 933     {
 934         nClass = 255;
 935         nBits = 0;
 936     }
 937
 938     // all unroutable addresses belong to the same group
 939     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     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     else if (IsRFC3964())
 953     {
 954         nClass = NET_IPV4;
 955         nStartByte = 2;
 956     }
 957     // for Teredo-tunnelled IPv6 addresses, use the encapsulated IPv4 address
 958     else if (IsRFC4380())
 959     {
 960         vchRet.push_back(NET_IPV4);
 961         vchRet.push_back(GetByte(3) ^ 0xFF);
 962         vchRet.push_back(GetByte(2) ^ 0xFF);
 963         return vchRet;
 964     }
 965     else if (IsTor())
 966     {
 967         nClass = NET_TOR;
 968         nStartByte = 6;
 969         nBits = 4;
 970     }
 971     // for he.net, use /36 groups
 972     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         nBits = 32;
 977
 978     vchRet.push_back(nClass);
 979     while (nBits >= 8)
 980     {
 981         vchRet.push_back(GetByte(15 - nStartByte));
 982         nStartByte++;
 983         nBits -= 8;
 984     }
 985     if (nBits > 0)
 986         vchRet.push_back(GetByte(15 - nStartByte) | ((1 << (8 - nBits)) - 1));
 987
 988     return vchRet;
 989 }
 990
 991 uint64_t CNetAddr::GetHash() const
 992 {
 993     uint256 hash = Hash(&ip[0], &ip[16]);
 994     uint64_t nRet;
 995     memcpy(&nRet, &hash, sizeof(nRet));
 996     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 int static GetExtNetwork(const CNetAddr *addr)
1004 {
1005     if (addr == NULL)
1006         return NET_UNKNOWN;
1007     if (addr->IsRFC4380())
1008         return NET_TEREDO;
1009     return addr->GetNetwork();
1010 }
1011
1012 /** Calculates a metric for how reachable (*this) is from a given partner */
1013 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     if (!IsRoutable())
1026         return REACH_UNREACHABLE;
1027
1028     int ourNet = GetExtNetwork(this);
1029     int theirNet = GetExtNetwork(paddrPartner);
1030     bool fTunnel = IsRFC3964() || IsRFC6052() || IsRFC6145();
1031
1032     switch(theirNet) {
1033     case NET_IPV4:
1034         switch(ourNet) {
1035         default:       return REACH_DEFAULT;
1036         case NET_IPV4: return REACH_IPV4;
1037         }
1038     case NET_IPV6:
1039         switch(ourNet) {
1040         default:         return REACH_DEFAULT;
1041         case NET_TEREDO: return REACH_TEREDO;
1042         case NET_IPV4:   return REACH_IPV4;
1043         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         switch(ourNet) {
1047         default:         return REACH_DEFAULT;
1048         case NET_IPV4:   return REACH_IPV4; // Tor users can connect to IPv4 as well
1049         case NET_TOR:    return REACH_PRIVATE;
1050         }
1051     case NET_TEREDO:
1052         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         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 void CService::Init()
1072 {
1073     port = 0;
1074 }
1075
1076 CService::CService()
1077 {
1078     Init();
1079 }
1080
1081 CService::CService(const CNetAddr& cip, unsigned short portIn) : CNetAddr(cip), port(portIn)
1082 {
1083 }
1084
1085 CService::CService(const struct in_addr& ipv4Addr, unsigned short portIn) : CNetAddr(ipv4Addr), port(portIn)
1086 {
1087 }
1088
1089 CService::CService(const struct in6_addr& ipv6Addr, unsigned short portIn) : CNetAddr(ipv6Addr), port(portIn)
1090 {
1091 }
1092
1093 CService::CService(const struct sockaddr_in& addr) : CNetAddr(addr.sin_addr), port(ntohs(addr.sin_port))
1094 {
1095     assert(addr.sin_family == AF_INET);
1096 }
1097
1098 CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr), port(ntohs(addr.sin6_port))
1099 {
1100    assert(addr.sin6_family == AF_INET6);
1101 }
1102
1103 bool CService::SetSockAddr(const struct sockaddr *paddr)
1104 {
1105     switch (paddr->sa_family) {
1106     case AF_INET:
1107         *this = CService(*(const struct sockaddr_in*)paddr);
1108         return true;
1109     case AF_INET6:
1110         *this = CService(*(const struct sockaddr_in6*)paddr);
1111         return true;
1112     default:
1113         return false;
1114     }
1115 }
1116
1117 CService::CService(const char *pszIpPort, bool fAllowLookup)
1118 {
1119     Init();
1120     CService ip;
1121     if (Lookup(pszIpPort, ip, 0, fAllowLookup))
1122         *this = ip;
1123 }
1124
1125 CService::CService(const char *pszIpPort, int portDefault, bool fAllowLookup)
1126 {
1127     Init();
1128     CService ip;
1129     if (Lookup(pszIpPort, ip, portDefault, fAllowLookup))
1130         *this = ip;
1131 }
1132
1133 CService::CService(const std::string &strIpPort, bool fAllowLookup)
1134 {
1135     Init();
1136     CService ip;
1137     if (Lookup(strIpPort.c_str(), ip, 0, fAllowLookup))
1138         *this = ip;
1139 }
1140
1141 CService::CService(const std::string &strIpPort, int portDefault, bool fAllowLookup)
1142 {
1143     Init();
1144     CService ip;
1145     if (Lookup(strIpPort.c_str(), ip, portDefault, fAllowLookup))
1146         *this = ip;
1147 }
1148
1149 unsigned short CService::GetPort() const
1150 {
1151     return port;
1152 }
1153
1154 bool operator==(const CService& a, const CService& b)
1155 {
1156     return (CNetAddr)a == (CNetAddr)b && a.port == b.port;
1157 }
1158
1159 bool operator!=(const CService& a, const CService& b)
1160 {
1161     return (CNetAddr)a != (CNetAddr)b || a.port != b.port;
1162 }
1163
1164 bool operator<(const CService& a, const CService& b)
1165 {
1166     return (CNetAddr)a < (CNetAddr)b || ((CNetAddr)a == (CNetAddr)b && a.port < b.port);
1167 }
1168
1169 bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const
1170 {
1171     if (IsIPv4()) {
1172         if (*addrlen < (socklen_t)sizeof(struct sockaddr_in))
1173             return false;
1174         *addrlen = sizeof(struct sockaddr_in);
1175         struct sockaddr_in *paddrin = (struct sockaddr_in*)paddr;
1176         memset(paddrin, 0, *addrlen);
1177         if (!GetInAddr(&paddrin->sin_addr))
1178             return false;
1179         paddrin->sin_family = AF_INET;
1180         paddrin->sin_port = htons(port);
1181         return true;
1182     }
1183     if (IsIPv6()) {
1184         if (*addrlen < (socklen_t)sizeof(struct sockaddr_in6))
1185             return false;
1186         *addrlen = sizeof(struct sockaddr_in6);
1187         struct sockaddr_in6 *paddrin6 = (struct sockaddr_in6*)paddr;
1188         memset(paddrin6, 0, *addrlen);
1189         if (!GetIn6Addr(&paddrin6->sin6_addr))
1190             return false;
1191         paddrin6->sin6_family = AF_INET6;
1192         paddrin6->sin6_port = htons(port);
1193         return true;
1194     }
1195     return false;
1196 }
1197
1198 std::vector<unsigned char> CService::GetKey() const
1199 {
1200      std::vector<unsigned char> vKey;
1201      vKey.resize(18);
1202      memcpy(&vKey[0], ip, 16);
1203      vKey[16] = port / 0x100;
1204      vKey[17] = port & 0x0FF;
1205      return vKey;
1206 }
1207
1208 std::string CService::ToStringPort() const
1209 {
1210     return strprintf("%u", port);
1211 }
1212
1213 std::string CService::ToStringIPPort() const
1214 {
1215     if (IsIPv4() || IsTor()) {
1216         return ToStringIP() + ":" + ToStringPort();
1217     } else {
1218         return "[" + ToStringIP() + "]:" + ToStringPort();
1219     }
1220 }
1221
1222 std::string CService::ToString() const
1223 {
1224     return ToStringIPPort();
1225 }
1226
1227 void CService::SetPort(unsigned short portIn)
1228 {
1229     port = portIn;
1230 }
1231
1232 CSubNet::CSubNet():
1233     valid(false)
1234 {
1235     memset(netmask, 0, sizeof(netmask));
1236 }
1237
1238 CSubNet::CSubNet(const std::string &strSubnet, bool fAllowLookup)
1239 {
1240     size_t slash = strSubnet.find_last_of('/');
1241     std::vector<CNetAddr> vIP;
1242
1243     valid = true;
1244     // Default to /32 (IPv4) or /128 (IPv6), i.e. match single address
1245     memset(netmask, 255, sizeof(netmask));
1246
1247     std::string strAddress = strSubnet.substr(0, slash);
1248     if (LookupHost(strAddress.c_str(), vIP, 1, fAllowLookup))
1249     {
1250         network = vIP[0];
1251         if (slash != strSubnet.npos)
1252         {
1253             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             const int astartofs = network.IsIPv4() ? 12 : 0;
1257             if (ParseInt32(strNetmask, &n)) // If valid number, assume /24 symtex
1258             {
1259                 if(n >= 0 && n <= (128 - astartofs*8)) // Only valid if in range of bits of address
1260                 {
1261                     n += astartofs*8;
1262                     // Clear bits [n..127]
1263                     for (; n < 128; ++n)
1264                         netmask[n>>3] &= ~(1<<(7-(n&7)));
1265                 }
1266                 else
1267                 {
1268                     valid = false;
1269                 }
1270             }
1271             else // If not a valid number, try full netmask syntax
1272             {
1273                 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                     for(int x=astartofs; x<16; ++x)
1278                         netmask[x] = vIP[0].ip[x];
1279                 }
1280                 else
1281                 {
1282                     valid = false;
1283                 }
1284             }
1285         }
1286     }
1287     else
1288     {
1289         valid = false;
1290     }
1291
1292     // Normalize network according to netmask
1293     for(int x=0; x<16; ++x)
1294         network.ip[x] &= netmask[x];
1295 }
1296
1297 CSubNet::CSubNet(const CNetAddr &addr):
1298     valid(addr.IsValid())
1299 {
1300     memset(netmask, 255, sizeof(netmask));
1301     network = addr;
1302 }
1303
1304 bool CSubNet::Match(const CNetAddr &addr) const
1305 {
1306     if (!valid || !addr.IsValid())
1307         return false;
1308     for(int x=0; x<16; ++x)
1309         if ((addr.ip[x] & netmask[x]) != network.ip[x])
1310             return false;
1311     return true;
1312 }
1313
1314 std::string CSubNet::ToString() const
1315 {
1316     std::string strNetmask;
1317     if (network.IsIPv4())
1318         strNetmask = strprintf("%u.%u.%u.%u", netmask[12], netmask[13], netmask[14], netmask[15]);
1319     else
1320         strNetmask = strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
1321                          netmask[0] << 8 | netmask[1], netmask[2] << 8 | netmask[3],
1322                          netmask[4] << 8 | netmask[5], netmask[6] << 8 | netmask[7],
1323                          netmask[8] << 8 | netmask[9], netmask[10] << 8 | netmask[11],
1324                          netmask[12] << 8 | netmask[13], netmask[14] << 8 | netmask[15]);
1325     return network.ToString() + "/" + strNetmask;
1326 }
1327
1328 bool CSubNet::IsValid() const
1329 {
1330     return valid;
1331 }
1332
1333 bool operator==(const CSubNet& a, const CSubNet& b)
1334 {
1335     return a.valid == b.valid && a.network == b.network && !memcmp(a.netmask, b.netmask, 16);
1336 }
1337
1338 bool operator!=(const CSubNet& a, const CSubNet& b)
1339 {
1340     return !(a==b);
1341 }
1342
1343 bool operator<(const CSubNet& a, const CSubNet& b)
1344 {
1345     return (a.network < b.network || (a.network == b.network && memcmp(a.netmask, b.netmask, 16) < 0));
1346 }
1347
1348 #ifdef WIN32
1349 std::string NetworkErrorString(int err)
1350 {
1351     char buf[256];
1352     buf[0] = 0;
1353     if(FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,
1354             NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
1355             buf, sizeof(buf), NULL))
1356     {
1357         return strprintf("%s (%d)", buf, err);
1358     }
1359     else
1360     {
1361         return strprintf("Unknown error (%d)", err);
1362     }
1363 }
1364 #else
1365 std::string NetworkErrorString(int err)
1366 {
1367     char buf[256];
1368     const char *s = buf;
1369     buf[0] = 0;
1370     /* Too bad there are two incompatible implementations of the
1371      * thread-safe strerror. */
1372 #ifdef STRERROR_R_CHAR_P /* GNU variant can return a pointer outside the passed buffer */
1373     s = strerror_r(err, buf, sizeof(buf));
1374 #else /* POSIX variant always returns message in buffer */
1375     if (strerror_r(err, buf, sizeof(buf)))
1376         buf[0] = 0;
1377 #endif
1378     return strprintf("%s (%d)", s, err);
1379 }
1380 #endif
1381
1382 bool CloseSocket(SOCKET& hSocket)
1383 {
1384     if (hSocket == INVALID_SOCKET)
1385         return false;
1386 #ifdef WIN32
1387     int ret = closesocket(hSocket);
1388 #else
1389     int ret = close(hSocket);
1390 #endif
1391     hSocket = INVALID_SOCKET;
1392     return ret != SOCKET_ERROR;
1393 }
1394
1395 bool SetSocketNonBlocking(SOCKET& hSocket, bool fNonBlocking)
1396 {
1397     if (fNonBlocking) {
1398 #ifdef WIN32
1399         u_long nOne = 1;
1400         if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR) {
1401 #else
1402         int fFlags = fcntl(hSocket, F_GETFL, 0);
1403         if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == SOCKET_ERROR) {
1404 #endif
1405             CloseSocket(hSocket);
1406             return false;
1407         }
1408     } else {
1409 #ifdef WIN32
1410         u_long nZero = 0;
1411         if (ioctlsocket(hSocket, FIONBIO, &nZero) == SOCKET_ERROR) {
1412 #else
1413         int fFlags = fcntl(hSocket, F_GETFL, 0);
1414         if (fcntl(hSocket, F_SETFL, fFlags & ~O_NONBLOCK) == SOCKET_ERROR) {
1415 #endif
1416             CloseSocket(hSocket);
1417             return false;
1418         }
1419     }
1420
1421     return true;
1422 }