// Copyright (c) 2009-2010 Satoshi Nakamoto // Distributed under the MIT/X11 software license, see the accompanying // file license.txt or http://www.opensource.org/licenses/mit-license.php. #include "headers.h" int nGotIRCAddresses = 0; bool fGotExternalIP = false; void ThreadIRCSeed2(void* parg); #pragma pack(push, 1) struct ircaddr { int ip; short port; }; #pragma pack(pop) string EncodeAddress(const CAddress& addr) { struct ircaddr tmp; tmp.ip = addr.ip; tmp.port = addr.port; vector vch(UBEGIN(tmp), UEND(tmp)); return string("u") + EncodeBase58Check(vch); } bool DecodeAddress(string str, CAddress& addr) { vector vch; if (!DecodeBase58Check(str.substr(1), vch)) return false; struct ircaddr tmp; if (vch.size() != sizeof(tmp)) return false; memcpy(&tmp, &vch[0], sizeof(tmp)); addr = CAddress(tmp.ip, tmp.port, NODE_NETWORK); return true; } static bool Send(SOCKET hSocket, const char* pszSend) { if (strstr(pszSend, "PONG") != pszSend) printf("IRC SENDING: %s\n", pszSend); const char* psz = pszSend; const char* pszEnd = psz + strlen(psz); while (psz < pszEnd) { int ret = send(hSocket, psz, pszEnd - psz, MSG_NOSIGNAL); if (ret < 0) return false; psz += ret; } return true; } bool RecvLine(SOCKET hSocket, string& strLine) { strLine = ""; loop { char c; int nBytes = recv(hSocket, &c, 1, 0); if (nBytes > 0) { if (c == '\n') continue; if (c == '\r') return true; strLine += c; if (strLine.size() >= 9000) return true; } else if (nBytes <= 0) { if (fShutdown) return false; if (nBytes < 0) { int nErr = WSAGetLastError(); if (nErr == WSAEMSGSIZE) continue; if (nErr == WSAEWOULDBLOCK || nErr == WSAEINTR || nErr == WSAEINPROGRESS) { Sleep(10); continue; } } if (!strLine.empty()) return true; if (nBytes == 0) { // socket closed printf("IRC socket closed\n"); return false; } else { // socket error int nErr = WSAGetLastError(); printf("IRC recv failed: %d\n", nErr); return false; } } } } bool RecvLineIRC(SOCKET hSocket, string& strLine) { loop { bool fRet = RecvLine(hSocket, strLine); if (fRet) { if (fShutdown) return false; vector vWords; ParseString(strLine, ' ', vWords); if (vWords.size() >= 1 && vWords[0] == "PING") { strLine[1] = 'O'; strLine += '\r'; Send(hSocket, strLine.c_str()); continue; } } return fRet; } } int RecvUntil(SOCKET hSocket, const char* psz1, const char* psz2=NULL, const char* psz3=NULL, const char* psz4=NULL) { loop { string strLine; strLine.reserve(10000); if (!RecvLineIRC(hSocket, strLine)) return 0; printf("IRC %s\n", strLine.c_str()); if (psz1 && strLine.find(psz1) != -1) return 1; if (psz2 && strLine.find(psz2) != -1) return 2; if (psz3 && strLine.find(psz3) != -1) return 3; if (psz4 && strLine.find(psz4) != -1) return 4; } } bool Wait(int nSeconds) { if (fShutdown) return false; printf("IRC waiting %d seconds to reconnect\n", nSeconds); for (int i = 0; i < nSeconds; i++) { if (fShutdown) return false; Sleep(1000); } return true; } bool RecvCodeLine(SOCKET hSocket, const char* psz1, string& strRet) { strRet.clear(); loop { string strLine; if (!RecvLineIRC(hSocket, strLine)) return false; vector vWords; ParseString(strLine, ' ', vWords); if (vWords.size() < 2) continue; if (vWords[1] == psz1) { printf("IRC %s\n", strLine.c_str()); strRet = strLine; return true; } } } bool GetIPFromIRC(SOCKET hSocket, string strMyName, unsigned int& ipRet) { Send(hSocket, strprintf("USERHOST %s\r", strMyName.c_str()).c_str()); string strLine; if (!RecvCodeLine(hSocket, "302", strLine)) return false; vector vWords; ParseString(strLine, ' ', vWords); if (vWords.size() < 4) return false; string str = vWords[3]; if (str.rfind("@") == string::npos) return false; string strHost = str.substr(str.rfind("@")+1); unsigned int a=0, b=0, c=0, d=0; if (sscanf(strHost.c_str(), "%u.%u.%u.%u", &a, &b, &c, &d) == 4 && inet_addr(strHost.c_str()) != INADDR_NONE) { printf("GetIPFromIRC() userhost is IP %s\n", strHost.c_str()); ipRet = CAddress(strHost).ip; } else { // Hybrid IRC used by lfnet always returns IP when you userhost yourself, // but in case another IRC is ever used this should work. printf("GetIPFromIRC() got userhost %s\n", strHost.c_str()); if (fUseProxy) return false; struct hostent* phostent = gethostbyname(strHost.c_str()); if (!phostent || !phostent->h_addr_list || !phostent->h_addr_list[0]) return false; ipRet = *(u_long*)phostent->h_addr_list[0]; } return true; } void ThreadIRCSeed(void* parg) { IMPLEMENT_RANDOMIZE_STACK(ThreadIRCSeed(parg)); try { ThreadIRCSeed2(parg); } catch (std::exception& e) { PrintExceptionContinue(&e, "ThreadIRCSeed()"); } catch (...) { PrintExceptionContinue(NULL, "ThreadIRCSeed()"); } printf("ThreadIRCSeed exiting\n"); } void ThreadIRCSeed2(void* parg) { /* Dont advertise on IRC if we don't allow incoming connections */ if (mapArgs.count("-connect") || fNoListen) return; if (GetBoolArg("-noirc")) return; printf("ThreadIRCSeed started\n"); int nErrorWait = 10; int nRetryWait = 10; bool fNameInUse = false; bool fTOR = (fUseProxy && addrProxy.port == htons(9050)); while (!fShutdown) { //CAddress addrConnect("216.155.130.130:6667"); // chat.freenode.net CAddress addrConnect("92.243.23.21:6667"); // irc.lfnet.org if (!fTOR) { //struct hostent* phostent = gethostbyname("chat.freenode.net"); struct hostent* phostent = gethostbyname("irc.lfnet.org"); if (phostent && phostent->h_addr_list && phostent->h_addr_list[0]) addrConnect = CAddress(*(u_long*)phostent->h_addr_list[0], htons(6667)); } SOCKET hSocket; if (!ConnectSocket(addrConnect, hSocket)) { printf("IRC connect failed\n"); nErrorWait = nErrorWait * 11 / 10; if (Wait(nErrorWait += 60)) continue; else return; } if (!RecvUntil(hSocket, "Found your hostname", "using your IP address instead", "Couldn't look up your hostname", "ignoring hostname")) { closesocket(hSocket); hSocket = INVALID_SOCKET; nErrorWait = nErrorWait * 11 / 10; if (Wait(nErrorWait += 60)) continue; else return; } string strMyName; if (addrLocalHost.IsRoutable() && !fUseProxy && !fNameInUse) strMyName = EncodeAddress(addrLocalHost); else strMyName = strprintf("x%u", GetRand(1000000000)); Send(hSocket, strprintf("NICK %s\r", strMyName.c_str()).c_str()); Send(hSocket, strprintf("USER %s 8 * : %s\r", strMyName.c_str(), strMyName.c_str()).c_str()); int nRet = RecvUntil(hSocket, " 004 ", " 433 "); if (nRet != 1) { closesocket(hSocket); hSocket = INVALID_SOCKET; if (nRet == 2) { printf("IRC name already in use\n"); fNameInUse = true; Wait(10); continue; } nErrorWait = nErrorWait * 11 / 10; if (Wait(nErrorWait += 60)) continue; else return; } Sleep(500); // Get our external IP from the IRC server and re-nick before joining the channel CAddress addrFromIRC; if (GetIPFromIRC(hSocket, strMyName, addrFromIRC.ip)) { printf("GetIPFromIRC() returned %s\n", addrFromIRC.ToStringIP().c_str()); if (!fUseProxy && addrFromIRC.IsRoutable()) { // IRC lets you to re-nick fGotExternalIP = true; addrLocalHost.ip = addrFromIRC.ip; strMyName = EncodeAddress(addrLocalHost); Send(hSocket, strprintf("NICK %s\r", strMyName.c_str()).c_str()); } } Send(hSocket, fTestNet ? "JOIN #bitcoinTEST\r" : "JOIN #bitcoin\r"); Send(hSocket, fTestNet ? "WHO #bitcoinTEST\r" : "WHO #bitcoin\r"); int64 nStart = GetTime(); string strLine; strLine.reserve(10000); while (!fShutdown && RecvLineIRC(hSocket, strLine)) { if (strLine.empty() || strLine.size() > 900 || strLine[0] != ':') continue; vector vWords; ParseString(strLine, ' ', vWords); if (vWords.size() < 2) continue; char pszName[10000]; pszName[0] = '\0'; if (vWords[1] == "352" && vWords.size() >= 8) { // index 7 is limited to 16 characters // could get full length name at index 10, but would be different from join messages strlcpy(pszName, vWords[7].c_str(), sizeof(pszName)); printf("IRC got who\n"); } if (vWords[1] == "JOIN" && vWords[0].size() > 1) { // :username!username@50000007.F000000B.90000002.IP JOIN :#channelname strlcpy(pszName, vWords[0].c_str() + 1, sizeof(pszName)); if (strchr(pszName, '!')) *strchr(pszName, '!') = '\0'; printf("IRC got join\n"); } if (pszName[0] == 'u') { CAddress addr; if (DecodeAddress(pszName, addr)) { addr.nTime = GetAdjustedTime(); if (AddAddress(addr, 51 * 60)) printf("IRC got new address\n"); nGotIRCAddresses++; } else { printf("IRC decode failed\n"); } } } closesocket(hSocket); hSocket = INVALID_SOCKET; // IRC usually blocks TOR, so only try once if (fTOR) return; if (GetTime() - nStart > 20 * 60) { nErrorWait /= 3; nRetryWait /= 3; } nRetryWait = nRetryWait * 11 / 10; if (!Wait(nRetryWait += 60)) return; } } #ifdef TEST int main(int argc, char *argv[]) { WSADATA wsadata; if (WSAStartup(MAKEWORD(2,2), &wsadata) != NO_ERROR) { printf("Error at WSAStartup()\n"); return false; } ThreadIRCSeed(NULL); WSACleanup(); return 0; } #endif