void CRoutingZone::ReadBootstrapNodesDat(CFileDataIO& file){
// Bootstrap versions of nodes.dat files, are in the style of version 1 nodes.dats. The difference is that
// they will contain more contacts 500-1000 instead 50, and those contacts are not added into the routingtable
// but used to sent Bootstrap packets too. The advantage is that on a list with a high ratio of dead nodes,
// we will be able to bootstrap faster than on a normal nodes.dat and more important, if we would deliver
// a normal nodes.dat with eMule, those 50 nodes would be kinda DDOSed because everyone adds them to their routing
// table, while with this style, we don't actually add any of the contacts to our routing table in the end and we
// ask only one of those 1000 contacts one time (well or more untill we find an alive one).
if (!CKademlia::s_liBootstapList.IsEmpty()){
ASSERT( false );
return;
}
uint32_t uNumContacts = file.ReadUInt32();
if (uNumContacts != 0 && uNumContacts * 25 == (file.GetLength() - file.GetPosition()))
{
uint32_t uValidContacts = 0;
CUInt128 uID;
while ( uNumContacts )
{
file.ReadUInt128(&uID);
uint32_t uIP = file.ReadUInt32();
uint16_t uUDPPort = file.ReadUInt16();
uint16_t uTCPPort = file.ReadUInt16();
uint8_t uContactVersion = file.ReadUInt8();
uint32_t uhostIP = ntohl(uIP);
if (::IsGoodIPPort(uhostIP, uUDPPort))
{
if (::theApp.ipfilter->IsFiltered(uhostIP))
{
if (::thePrefs.GetLogFilteredIPs())
AddDebugLogLine(false, _T("Ignored kad contact (IP=%s:%u)--read known.dat -- - IP filter (%s)") , ipstr(uhostIP), uUDPPort, ::theApp.ipfilter->GetLastHit());
}
else if (uUDPPort == 53 && uContactVersion <= KADEMLIA_VERSION5_48a)
{
if (::thePrefs.GetLogFilteredIPs())
AddDebugLogLine(false, _T("Ignored kad contact (IP=%s:%u)--read known.dat") , ipstr(uhostIP), uUDPPort);
}
else if (uContactVersion > 1) // only kad2 nodes
{
// we want the 50 nodes closest to our own ID (provides randomness between different users and gets has good chances to get a bootstrap with close Nodes which is a nice start for our routing table)
CUInt128 uDistance = uMe;
uDistance.Xor(uID);
uValidContacts++;
// don't bother if we already have 50 and the farest distance is smaller than this contact
if (CKademlia::s_liBootstapList.GetCount() < 50 || CKademlia::s_liBootstapList.GetTail()->GetDistance() > uDistance){
// look were to put this contact into the proper position
bool bInserted = false;
CContact* pContact = new CContact(uID, uIP, uUDPPort, uTCPPort, uMe, uContactVersion, 0, false);
for (POSITION pos = CKademlia::s_liBootstapList.GetHeadPosition(); pos != NULL; CKademlia::s_liBootstapList.GetNext(pos)){
if (CKademlia::s_liBootstapList.GetAt(pos)->GetDistance() > uDistance){
CKademlia::s_liBootstapList.InsertBefore(pos, pContact);
bInserted = true;
break;
}
}
if (!bInserted){
ASSERT( CKademlia::s_liBootstapList.GetCount() < 50 );
CKademlia::s_liBootstapList.AddTail(pContact);
}
else if (CKademlia::s_liBootstapList.GetCount() > 50)
delete CKademlia::s_liBootstapList.RemoveTail();
}
}
}
uNumContacts--;
}
AddLogLine( false, GetResString(IDS_KADCONTACTSREAD), CKademlia::s_liBootstapList.GetCount());
DebugLog(_T("Loaded Bootstrap nodes.dat, selected %u out of %u valid contacts"), CKademlia::s_liBootstapList.GetCount(), uValidContacts);
}
}
