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bitcoin/src/irc.cpp
Gregory Maxwell 6a60c64c6b Don't retry a failing IRC nickname forever. 
If our IRC nick is in use (because some other node thinks it has
the same address we think we have) don't fruitlessly try to reconnect
using that name forever. After three tries, give up and use a random
nick. Either we'll learn a new local address from IRC and switch
to that, or it was right and the other guy is advertising for us.

This avoids a pessimal case where a second testnet node behind
a nat is unable to get any peers because he can't get on IRC.
2012-08-28 22:04:38 -04:00

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "irc.h"
#include "net.h"
#include "strlcpy.h"
#include "base58.h"
using namespace std;
using namespace boost;
int nGotIRCAddresses = 0;
void ThreadIRCSeed2(void* parg);
#pragma pack(push, 1)
struct ircaddr
{
struct in_addr ip;
short port;
};
#pragma pack(pop)
string EncodeAddress(const CService& addr)
{
struct ircaddr tmp;
if (addr.GetInAddr(&tmp.ip))
{
tmp.port = htons(addr.GetPort());
vector<unsigned char> vch(UBEGIN(tmp), UEND(tmp));
return string("u") + EncodeBase58Check(vch);
}
return "";
}
bool DecodeAddress(string str, CService& addr)
{
vector<unsigned char> 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 = CService(tmp.ip, ntohs(tmp.port));
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 RecvLineIRC(SOCKET hSocket, string& strLine)
{
loop
{
bool fRet = RecvLine(hSocket, strLine);
if (fRet)
{
if (fShutdown)
return false;
vector<string> 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) != string::npos)
return 1;
if (psz2 && strLine.find(psz2) != string::npos)
return 2;
if (psz3 && strLine.find(psz3) != string::npos)
return 3;
if (psz4 && strLine.find(psz4) != string::npos)
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<string> 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, CNetAddr& ipRet)
{
Send(hSocket, strprintf("USERHOST %s\r", strMyName.c_str()).c_str());
string strLine;
if (!RecvCodeLine(hSocket, "302", strLine))
return false;
vector<string> 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);
// 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());
CNetAddr addr(strHost, true);
if (!addr.IsValid())
return false;
ipRet = addr;
return true;
}
void ThreadIRCSeed(void* parg)
{
IMPLEMENT_RANDOMIZE_STACK(ThreadIRCSeed(parg));
// Make this thread recognisable as the IRC seeding thread
RenameThread("bitcoin-ircseed");
try
{
ThreadIRCSeed2(parg);
}
catch (std::exception& e) {
PrintExceptionContinue(&e, "ThreadIRCSeed()");
} catch (...) {
PrintExceptionContinue(NULL, "ThreadIRCSeed()");
}
printf("ThreadIRCSeed exited\n");
}
void ThreadIRCSeed2(void* parg)
{
// Don't connect to IRC if we won't use IPv4 connections.
if (IsLimited(NET_IPV4))
return;
// ... or if we won't make outbound connections and won't accept inbound ones.
if (mapArgs.count("-connect") && fNoListen)
return;
// ... or if IRC is not enabled.
if (!GetBoolArg("-irc", false))
return;
printf("ThreadIRCSeed started\n");
int nErrorWait = 10;
int nRetryWait = 10;
int nNameRetry = 0;
while (!fShutdown)
{
CService addrConnect("92.243.23.21", 6667); // irc.lfnet.org
CService addrIRC("irc.lfnet.org", 6667, true);
if (addrIRC.IsValid())
addrConnect = addrIRC;
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;
}
CNetAddr addrIPv4("1.2.3.4"); // arbitrary IPv4 address to make GetLocal prefer IPv4 addresses
CService addrLocal;
string strMyName;
// Don't use our IP as our nick if we're not listening
// or if it keeps failing because the nick is already in use.
if (!fNoListen && GetLocal(addrLocal, &addrIPv4) && nNameRetry<3)
strMyName = EncodeAddress(GetLocalAddress(&addrConnect));
if (strMyName == "")
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");
nNameRetry++;
Wait(10);
continue;
}
nErrorWait = nErrorWait * 11 / 10;
if (Wait(nErrorWait += 60))
continue;
else
return;
}
nNameRetry = 0;
Sleep(500);
// Get our external IP from the IRC server and re-nick before joining the channel
CNetAddr addrFromIRC;
if (GetIPFromIRC(hSocket, strMyName, addrFromIRC))
{
printf("GetIPFromIRC() returned %s\n", addrFromIRC.ToString().c_str());
// Don't use our IP as our nick if we're not listening
if (!fNoListen && addrFromIRC.IsRoutable())
{
// IRC lets you to re-nick
AddLocal(addrFromIRC, LOCAL_IRC);
strMyName = EncodeAddress(GetLocalAddress(&addrConnect));
Send(hSocket, strprintf("NICK %s\r", strMyName.c_str()).c_str());
}
}
if (fTestNet) {
Send(hSocket, "JOIN #bitcoinTEST3\r");
Send(hSocket, "WHO #bitcoinTEST3\r");
} else {
// randomly join #bitcoin00-#bitcoin99
int channel_number = GetRandInt(100);
Send(hSocket, strprintf("JOIN #bitcoin%02d\r", channel_number).c_str());
Send(hSocket, strprintf("WHO #bitcoin%02d\r", channel_number).c_str());
}
int64 nStart = GetTime();
string strLine;
strLine.reserve(10000);
while (!fShutdown && RecvLineIRC(hSocket, strLine))
{
if (strLine.empty() || strLine.size() > 900 || strLine[0] != ':')
continue;
vector<string> 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 (addrman.Add(addr, addrConnect, 51 * 60))
printf("IRC got new address: %s\n", addr.ToString().c_str());
nGotIRCAddresses++;
}
else
{
printf("IRC decode failed\n");
}
}
}
closesocket(hSocket);
hSocket = INVALID_SOCKET;
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
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