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/*
This file is part of cpp-ethereum.
cpp-ethereum 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 3 of the License, or
(at your option) any later version.
cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file Common.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#include "Common.h"
using namespace std;
using namespace dev;
using namespace dev::p2p;
const unsigned dev::p2p::c_protocolVersion = 3;
const unsigned dev::p2p::c_defaultIPPort = 30303;
bool p2p::isPublicAddress(std::string const& _addressToCheck)
{
return _addressToCheck.empty() ? false : isPublicAddress(bi::address::from_string(_addressToCheck));
}
bool p2p::isPublicAddress(bi::address const& _addressToCheck)
{
return !(isPrivateAddress(_addressToCheck) || isLocalHostAddress(_addressToCheck));
}
// Helper function to determine if an address falls within one of the reserved ranges
// For V4:
// Class A "10.*", Class B "172.[16->31].*", Class C "192.168.*"
bool p2p::isPrivateAddress(bi::address const& _addressToCheck)
{
if (_addressToCheck.is_v4())
{
bi::address_v4 v4Address = _addressToCheck.to_v4();
bi::address_v4::bytes_type bytesToCheck = v4Address.to_bytes();
if (bytesToCheck[0] == 10 || bytesToCheck[0] == 127)
return true;
if (bytesToCheck[0] == 172 && (bytesToCheck[1] >= 16 && bytesToCheck[1] <= 31))
return true;
if (bytesToCheck[0] == 192 && bytesToCheck[1] == 168)
return true;
}
else if (_addressToCheck.is_v6())
{
bi::address_v6 v6Address = _addressToCheck.to_v6();
bi::address_v6::bytes_type bytesToCheck = v6Address.to_bytes();
if (bytesToCheck[0] == 0xfd && bytesToCheck[1] == 0)
return true;
if (!bytesToCheck[0] && !bytesToCheck[1] && !bytesToCheck[2] && !bytesToCheck[3] && !bytesToCheck[4] && !bytesToCheck[5] && !bytesToCheck[6] && !bytesToCheck[7]
&& !bytesToCheck[8] && !bytesToCheck[9] && !bytesToCheck[10] && !bytesToCheck[11] && !bytesToCheck[12] && !bytesToCheck[13] && !bytesToCheck[14] && (bytesToCheck[15] == 0 || bytesToCheck[15] == 1))
return true;
}
return false;
}
bool p2p::isPrivateAddress(std::string const& _addressToCheck)
{
return _addressToCheck.empty() ? false : isPrivateAddress(bi::address::from_string(_addressToCheck));
}
// Helper function to determine if an address is localhost
bool p2p::isLocalHostAddress(bi::address const& _addressToCheck)
{
// @todo: ivp6 link-local adresses (macos), ex: fe80::1%lo0
static const set<bi::address> c_rejectAddresses = {
{bi::address_v4::from_string("127.0.0.1")},
{bi::address_v4::from_string("0.0.0.0")},
{bi::address_v6::from_string("::1")},
{bi::address_v6::from_string("::")}
};
return find(c_rejectAddresses.begin(), c_rejectAddresses.end(), _addressToCheck) != c_rejectAddresses.end();
}
bool p2p::isLocalHostAddress(std::string const& _addressToCheck)
{
return _addressToCheck.empty() ? false : isLocalHostAddress(bi::address::from_string(_addressToCheck));
}
std::string p2p::reasonOf(DisconnectReason _r)
{
switch (_r)
{
case DisconnectRequested: return "Disconnect was requested.";
case TCPError: return "Low-level TCP communication error.";
case BadProtocol: return "Data format error.";
case UselessPeer: return "Peer had no use for this node.";
case TooManyPeers: return "Peer had too many connections.";
case DuplicatePeer: return "Peer was already connected.";
case IncompatibleProtocol: return "Peer protocol versions are incompatible.";
case NullIdentity: return "Null identity given.";
case ClientQuit: return "Peer is exiting.";
case UnexpectedIdentity: return "Unexpected identity given.";
case LocalIdentity: return "Connected to ourselves.";
case UserReason: return "Subprotocol reason.";
case NoDisconnect: return "(No disconnect has happened.)";
default: return "Unknown reason.";
}
}
void Node::cullEndpoint()
{
if (!isPublicAddress(endpoint.tcp.address()) && isPublicAddress(endpoint.udp.address()))
endpoint.tcp.address(endpoint.udp.address());
}