src/irc.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2012 The Bitcoin developers
   3 // Distributed under the MIT/X11 software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 #include "irc.h"
   7 #include "net.h"
   8 #include "strlcpy.h"
   9 #include "base58.h"
  10
  11 using namespace std;
  12 using namespace boost;
  13
  14 int nGotIRCAddresses = 0;
  15
  16 void ThreadIRCSeed2(void* parg);
  17
  18
  19
  20
  21 #pragma pack(push, 1)
  22 struct ircaddr
  23 {
  24     struct in_addr ip;
  25     short port;
  26 };
  27 #pragma pack(pop)
  28
  29 string EncodeAddress(const CService& addr)
  30 {
  31     struct ircaddr tmp;
  32     if (addr.GetInAddr(&tmp.ip))
  33     {
  34         tmp.port = htons(addr.GetPort());
  35
  36         vector<unsigned char> vch(UBEGIN(tmp), UEND(tmp));
  37         return string("u") + EncodeBase58Check(vch);
  38     }
  39     return "";
  40 }
  41
  42 bool DecodeAddress(string str, CService& addr)
  43 {
  44     vector<unsigned char> vch;
  45     if (!DecodeBase58Check(str.substr(1), vch))
  46         return false;
  47
  48     struct ircaddr tmp;
  49     if (vch.size() != sizeof(tmp))
  50         return false;
  51     memcpy(&tmp, &vch[0], sizeof(tmp));
  52
  53     addr = CService(tmp.ip, ntohs(tmp.port));
  54     return true;
  55 }
  56
  57
  58
  59
  60
  61
  62 static bool Send(SOCKET hSocket, const char* pszSend)
  63 {
  64     if (strstr(pszSend, "PONG") != pszSend)
  65         printf("IRC SENDING: %s\n", pszSend);
  66     const char* psz = pszSend;
  67     const char* pszEnd = psz + strlen(psz);
  68     while (psz < pszEnd)
  69     {
  70         int ret = send(hSocket, psz, pszEnd - psz, MSG_NOSIGNAL);
  71         if (ret < 0)
  72             return false;
  73         psz += ret;
  74     }
  75     return true;
  76 }
  77
  78 bool RecvLineIRC(SOCKET hSocket, string& strLine)
  79 {
  80     loop
  81     {
  82         bool fRet = RecvLine(hSocket, strLine);
  83         if (fRet)
  84         {
  85             if (fShutdown)
  86                 return false;
  87             vector<string> vWords;
  88             ParseString(strLine, ' ', vWords);
  89             if (vWords.size() >= 1 && vWords[0] == "PING")
  90             {
  91                 strLine[1] = 'O';
  92                 strLine += '\r';
  93                 Send(hSocket, strLine.c_str());
  94                 continue;
  95             }
  96         }
  97         return fRet;
  98     }
  99 }
 100
 101 int RecvUntil(SOCKET hSocket, const char* psz1, const char* psz2=NULL, const char* psz3=NULL, const char* psz4=NULL)
 102 {
 103     loop
 104     {
 105         string strLine;
 106         strLine.reserve(10000);
 107         if (!RecvLineIRC(hSocket, strLine))
 108             return 0;
 109         printf("IRC %s\n", strLine.c_str());
 110         if (psz1 && strLine.find(psz1) != string::npos)
 111             return 1;
 112         if (psz2 && strLine.find(psz2) != string::npos)
 113             return 2;
 114         if (psz3 && strLine.find(psz3) != string::npos)
 115             return 3;
 116         if (psz4 && strLine.find(psz4) != string::npos)
 117             return 4;
 118     }
 119 }
 120
 121 bool Wait(int nSeconds)
 122 {
 123     if (fShutdown)
 124         return false;
 125     printf("IRC waiting %d seconds to reconnect\n", nSeconds);
 126     for (int i = 0; i < nSeconds; i++)
 127     {
 128         if (fShutdown)
 129             return false;
 130         Sleep(1000);
 131     }
 132     return true;
 133 }
 134
 135 bool RecvCodeLine(SOCKET hSocket, const char* psz1, string& strRet)
 136 {
 137     strRet.clear();
 138     loop
 139     {
 140         string strLine;
 141         if (!RecvLineIRC(hSocket, strLine))
 142             return false;
 143
 144         vector<string> vWords;
 145         ParseString(strLine, ' ', vWords);
 146         if (vWords.size() < 2)
 147             continue;
 148
 149         if (vWords[1] == psz1)
 150         {
 151             printf("IRC %s\n", strLine.c_str());
 152             strRet = strLine;
 153             return true;
 154         }
 155     }
 156 }
 157
 158 bool GetIPFromIRC(SOCKET hSocket, string strMyName, CNetAddr& ipRet)
 159 {
 160     Send(hSocket, strprintf("USERHOST %s\r", strMyName.c_str()).c_str());
 161
 162     string strLine;
 163     if (!RecvCodeLine(hSocket, "302", strLine))
 164         return false;
 165
 166     vector<string> vWords;
 167     ParseString(strLine, ' ', vWords);
 168     if (vWords.size() < 4)
 169         return false;
 170
 171     string str = vWords[3];
 172     if (str.rfind("@") == string::npos)
 173         return false;
 174     string strHost = str.substr(str.rfind("@")+1);
 175
 176     // Hybrid IRC used by lfnet always returns IP when you userhost yourself,
 177     // but in case another IRC is ever used this should work.
 178     printf("GetIPFromIRC() got userhost %s\n", strHost.c_str());
 179     CNetAddr addr(strHost, true);
 180     if (!addr.IsValid())
 181         return false;
 182     ipRet = addr;
 183
 184     return true;
 185 }
 186
 187
 188
 189 void ThreadIRCSeed(void* parg)
 190 {
 191     IMPLEMENT_RANDOMIZE_STACK(ThreadIRCSeed(parg));
 192
 193     // Make this thread recognisable as the IRC seeding thread
 194     RenameThread("bitcoin-ircseed");
 195
 196     try
 197     {
 198         ThreadIRCSeed2(parg);
 199     }
 200     catch (std::exception& e) {
 201         PrintExceptionContinue(&e, "ThreadIRCSeed()");
 202     } catch (...) {
 203         PrintExceptionContinue(NULL, "ThreadIRCSeed()");
 204     }
 205     printf("ThreadIRCSeed exited\n");
 206 }
 207
 208 void ThreadIRCSeed2(void* parg)
 209 {
 210     // Don't connect to IRC if we won't use IPv4 connections.
 211     if (IsLimited(NET_IPV4))
 212         return;
 213
 214     // ... or if we won't make outbound connections and won't accept inbound ones.
 215     if (mapArgs.count("-connect") && fNoListen)
 216         return;
 217
 218     // ... or if IRC is not enabled.
 219     if (!GetBoolArg("-irc", false))
 220         return;
 221
 222     printf("ThreadIRCSeed started\n");
 223     int nErrorWait = 10;
 224     int nRetryWait = 10;
 225     int nNameRetry = 0;
 226
 227     while (!fShutdown)
 228     {
 229         CService addrConnect("92.243.23.21", 6667); // irc.lfnet.org
 230
 231         CService addrIRC("irc.lfnet.org", 6667, true);
 232         if (addrIRC.IsValid())
 233             addrConnect = addrIRC;
 234
 235         SOCKET hSocket;
 236         if (!ConnectSocket(addrConnect, hSocket))
 237         {
 238             printf("IRC connect failed\n");
 239             nErrorWait = nErrorWait * 11 / 10;
 240             if (Wait(nErrorWait += 60))
 241                 continue;
 242             else
 243                 return;
 244         }
 245
 246         if (!RecvUntil(hSocket, "Found your hostname", "using your IP address instead", "Couldn't look up your hostname", "ignoring hostname"))
 247         {
 248             closesocket(hSocket);
 249             hSocket = INVALID_SOCKET;
 250             nErrorWait = nErrorWait * 11 / 10;
 251             if (Wait(nErrorWait += 60))
 252                 continue;
 253             else
 254                 return;
 255         }
 256
 257         CNetAddr addrIPv4("1.2.3.4"); // arbitrary IPv4 address to make GetLocal prefer IPv4 addresses
 258         CService addrLocal;
 259         string strMyName;
 260         // Don't use our IP as our nick if we're not listening
 261         // or if it keeps failing because the nick is already in use.
 262         if (!fNoListen && GetLocal(addrLocal, &addrIPv4) && nNameRetry<3)
 263             strMyName = EncodeAddress(GetLocalAddress(&addrConnect));
 264         if (strMyName == "")
 265             strMyName = strprintf("x%u", GetRand(1000000000));
 266
 267         Send(hSocket, strprintf("NICK %s\r", strMyName.c_str()).c_str());
 268         Send(hSocket, strprintf("USER %s 8 * : %s\r", strMyName.c_str(), strMyName.c_str()).c_str());
 269
 270         int nRet = RecvUntil(hSocket, " 004 ", " 433 ");
 271         if (nRet != 1)
 272         {
 273             closesocket(hSocket);
 274             hSocket = INVALID_SOCKET;
 275             if (nRet == 2)
 276             {
 277                 printf("IRC name already in use\n");
 278                 nNameRetry++;
 279                 Wait(10);
 280                 continue;
 281             }
 282             nErrorWait = nErrorWait * 11 / 10;
 283             if (Wait(nErrorWait += 60))
 284                 continue;
 285             else
 286                 return;
 287         }
 288         nNameRetry = 0;
 289         Sleep(500);
 290
 291         // Get our external IP from the IRC server and re-nick before joining the channel
 292         CNetAddr addrFromIRC;
 293         if (GetIPFromIRC(hSocket, strMyName, addrFromIRC))
 294         {
 295             printf("GetIPFromIRC() returned %s\n", addrFromIRC.ToString().c_str());
 296             // Don't use our IP as our nick if we're not listening
 297             if (!fNoListen && addrFromIRC.IsRoutable())
 298             {
 299                 // IRC lets you to re-nick
 300                 AddLocal(addrFromIRC, LOCAL_IRC);
 301                 strMyName = EncodeAddress(GetLocalAddress(&addrConnect));
 302                 Send(hSocket, strprintf("NICK %s\r", strMyName.c_str()).c_str());
 303             }
 304         }
 305
 306         if (fTestNet) {
 307             Send(hSocket, "JOIN #bitcoinTEST3\r");
 308             Send(hSocket, "WHO #bitcoinTEST3\r");
 309         } else {
 310             // randomly join #bitcoin00-#bitcoin99
 311             int channel_number = GetRandInt(100);
 312             Send(hSocket, strprintf("JOIN #bitcoin%02d\r", channel_number).c_str());
 313             Send(hSocket, strprintf("WHO #bitcoin%02d\r", channel_number).c_str());
 314         }
 315
 316         int64 nStart = GetTime();
 317         string strLine;
 318         strLine.reserve(10000);
 319         while (!fShutdown && RecvLineIRC(hSocket, strLine))
 320         {
 321             if (strLine.empty() || strLine.size() > 900 || strLine[0] != ':')
 322                 continue;
 323
 324             vector<string> vWords;
 325             ParseString(strLine, ' ', vWords);
 326             if (vWords.size() < 2)
 327                 continue;
 328
 329             char pszName[10000];
 330             pszName[0] = '\0';
 331
 332             if (vWords[1] == "352" && vWords.size() >= 8)
 333             {
 334                 // index 7 is limited to 16 characters
 335                 // could get full length name at index 10, but would be different from join messages
 336                 strlcpy(pszName, vWords[7].c_str(), sizeof(pszName));
 337                 printf("IRC got who\n");
 338             }
 339
 340             if (vWords[1] == "JOIN" && vWords[0].size() > 1)
 341             {
 342                 // :username!username@50000007.F000000B.90000002.IP JOIN :#channelname
 343                 strlcpy(pszName, vWords[0].c_str() + 1, sizeof(pszName));
 344                 if (strchr(pszName, '!'))
 345                     *strchr(pszName, '!') = '\0';
 346                 printf("IRC got join\n");
 347             }
 348
 349             if (pszName[0] == 'u')
 350             {
 351                 CAddress addr;
 352                 if (DecodeAddress(pszName, addr))
 353                 {
 354                     addr.nTime = GetAdjustedTime();
 355                     if (addrman.Add(addr, addrConnect, 51 * 60))
 356                         printf("IRC got new address: %s\n", addr.ToString().c_str());
 357                     nGotIRCAddresses++;
 358                 }
 359                 else
 360                 {
 361                     printf("IRC decode failed\n");
 362                 }
 363             }
 364         }
 365         closesocket(hSocket);
 366         hSocket = INVALID_SOCKET;
 367
 368         if (GetTime() - nStart > 20 * 60)
 369         {
 370             nErrorWait /= 3;
 371             nRetryWait /= 3;
 372         }
 373
 374         nRetryWait = nRetryWait * 11 / 10;
 375         if (!Wait(nRetryWait += 60))
 376             return;
 377     }
 378 }
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389 #ifdef TEST
 390 int main(int argc, char *argv[])
 391 {
 392     WSADATA wsadata;
 393     if (WSAStartup(MAKEWORD(2,2), &wsadata) != NO_ERROR)
 394     {
 395         printf("Error at WSAStartup()\n");
 396         return false;
 397     }
 398
 399     ThreadIRCSeed(NULL);
 400
 401     WSACleanup();
 402     return 0;
 403 }
 404 #endif