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hack to support bootstraping with non standard ports using dns seeder

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This commit is contained in:
Miguel Freitas 2015-08-01 16:42:29 -03:00
parent dbf804aacf
commit 851b69f2fa
3 changed files with 39 additions and 0 deletions
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23
src/net.cpp
View File

@ -1219,6 +1219,29 @@ void _ThreadDNSAddressSeed(const char *strDNS)
vAdd.push_back(addr);
found++;
}
// non std ports hack: see twister-seeder
string nonStdHost = "nonstd." + seed.host;
if (LookupHost(nonStdHost.c_str(), vIPs))
{
BOOST_FOREACH(CNetAddr& ip, vIPs)
{
unsigned short crcAddr = ip.crc16();
BOOST_FOREACH(CNetAddr& ipPort, vIPs)
{
if( ipPort.GetByte(3) == (crcAddr >> 8) &&
ipPort.GetByte(2) == (crcAddr & 0xff) ) {
int port = (ipPort.GetByte(1) << 8) + ipPort.GetByte(0);
int nOneDay = 24*3600;
CAddress addr = CAddress(CService(ip, port));
addr.nTime = GetTime() - 3*nOneDay - GetRand(4*nOneDay); // use a random age between 3 and 7 days old
vAdd.push_back(addr);
found++;
}
}
}
}
}
addrman.Add(vAdd, CNetAddr(seed.name, true));
}

15
src/netbase.cpp
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@ -894,6 +894,21 @@ uint64 CNetAddr::GetHash() const
return nRet;
}
unsigned short CNetAddr::crc16() const
{
unsigned char x;
unsigned short crc = 0xFFFF;
const unsigned char* data_p = IsIPv4() ? &ip[12] : &ip[0];
unsigned char length = IsIPv4() ? 4 : 16;
while (length--){
x = crc >> 8 ^ *data_p++;
x ^= x>>4;
crc = (crc << 8) ^ ((unsigned short)(x << 12)) ^ ((unsigned short)(x <<5)) ^ ((unsigned short)x);
}
return crc;
}
void CNetAddr::print() const
{
printf("CNetAddr(%s)\n", ToString().c_str());

1
src/netbase.h
View File

@ -66,6 +66,7 @@ class CNetAddr
std::string ToStringIP() const;
unsigned int GetByte(int n) const;
uint64 GetHash() const;
unsigned short crc16() const;
bool GetInAddr(struct in_addr* pipv4Addr) const;
std::vector<unsigned char> GetGroup() const;
int GetReachabilityFrom(const CNetAddr *paddrPartner = NULL) const;