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/*
* Copyright (C) 2009-2010 Big Muscle, http://strongdc.sourceforge.net/
* Copyright (C) 2019 Boris Pek <tehnick-8@yandex.ru>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "stdafx.h"
#include "BootstrapManager.h"
#include "Constants.h"
#include "DHT.h"
#include "SearchManager.h"
#include "dcpp/AdcCommand.h"
#include "dcpp/ClientManager.h"
#include "dcpp/HttpConnection.h"
#include "dcpp/LogManager.h"
#include <zlib.h>
namespace dht
{
vector<string> dhtservers;
BootstrapManager::BootstrapManager(void)
{
dhtservers.push_back("http://strongdc.sourceforge.net/bootstrap/");
dhtservers.push_back("http://dht.fly-server.ru/dcDHT.php");
httpConnection.addListener(this);
}
BootstrapManager::~BootstrapManager(void)
{
httpConnection.removeListener(this);
}
void BootstrapManager::bootstrap()
{
if(bootstrapNodes.empty())
{
LogManager::getInstance()->message(_("DHT bootstrapping started"));
string dhturl = dhtservers[Util::rand(dhtservers.size())];
// TODO: make URL settable
string url = dhturl + "?cid=" + ClientManager::getInstance()->getMe()->getCID().toBase32() + "&encryption=1";
// store only active nodes to database
if(ClientManager::getInstance()->isActive(Util::emptyString))
{
url += "&u4=" + DHT::getInstance()->getPort();
}
httpConnection.downloadFile(url);
}
}
void BootstrapManager::on(HttpConnectionListener::Data, HttpConnection*, const uint8_t* buf, size_t len) throw()
{
nodesXML += string((const char*)buf, len);
}
#define BUFSIZE 16384
void BootstrapManager::on(HttpConnectionListener::Complete, HttpConnection*, string const&) throw()
{
if(!nodesXML.empty())
{
try
{
uLongf destLen = BUFSIZE;
std::unique_ptr<uint8_t[]> destBuf;
// decompress incoming packet
int result;
do
{
destLen *= 2;
destBuf.reset(new uint8_t[destLen]);
result = uncompress(&destBuf[0], &destLen, (Bytef*)nodesXML.data(), nodesXML.length());
}
while (result == Z_BUF_ERROR);
if(result != Z_OK)
{
// decompression error!!!
throw Exception("Decompress error.");
}
SimpleXML remoteXml;
remoteXml.fromXML(string((char*)&destBuf[0], destLen));
remoteXml.stepIn();
while(remoteXml.findChild("Node"))
{
CID cid = CID(remoteXml.getChildAttrib("CID"));
string i4 = remoteXml.getChildAttrib("I4");
string u4 = remoteXml.getChildAttrib("U4");
addBootstrapNode(i4, u4, cid, UDPKey());
}
remoteXml.stepOut();
LogManager::getInstance()->message(_("DHT bootstrapping is finished successfully."));
}
catch(Exception& e)
{
LogManager::getInstance()->message(_("DHT bootstrap error: ") + e.getError());
}
}
}
void BootstrapManager::on(HttpConnectionListener::Failed, HttpConnection*, const string& aLine) throw()
{
LogManager::getInstance()->message(_("DHT bootstrap error: ") + aLine);
}
void BootstrapManager::addBootstrapNode(const string& ip, const string& udpPort, const CID& targetCID, const UDPKey& udpKey)
{
BootstrapNode node = { ip, udpPort, targetCID, udpKey };
bootstrapNodes.push_back(node);
}
void BootstrapManager::process()
{
Lock l(cs);
if(!bootstrapNodes.empty())
{
// send bootstrap request
AdcCommand cmd(AdcCommand::CMD_GET, AdcCommand::TYPE_UDP);
cmd.addParam("nodes");
cmd.addParam("dht.xml");
const BootstrapNode& node = bootstrapNodes.front();
CID key;
// if our external IP changed from the last time, we can't encrypt packet with this key
// this won't probably work now
if(DHT::getInstance()->getLastExternalIP() == node.udpKey.ip)
key = node.udpKey.key;
DHT::getInstance()->send(cmd, node.ip, node.udpPort, node.cid, key);
bootstrapNodes.pop_front();
}
}
}
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