private void receivePing(Packet packet) {
boolean ok = packet.verifySignature(_context, packet.getOptionalFrom(), null);
if (!ok) {
if (_log.shouldLog(Log.WARN)) {
if (packet.getOptionalFrom() == null)
_log.warn(
"Ping with no from (flagged? " + packet.isFlagSet(Packet.FLAG_FROM_INCLUDED) + ")");
else if (packet.getOptionalSignature() == null)
_log.warn(
"Ping with no signature (flagged? "
+ packet.isFlagSet(Packet.FLAG_SIGNATURE_INCLUDED)
+ ")");
else
_log.warn(
"Forged ping, discard (from="
+ packet.getOptionalFrom().calculateHash().toBase64()
+ " sig="
+ packet.getOptionalSignature().toBase64()
+ ")");
}
} else {
PacketLocal pong = new PacketLocal(_context, packet.getOptionalFrom());
pong.setFlag(Packet.FLAG_ECHO, true);
pong.setFlag(Packet.FLAG_SIGNATURE_INCLUDED, false);
pong.setReceiveStreamId(packet.getSendStreamId());
_manager.getPacketQueue().enqueue(pong);
}
}
/**
* This sends a reset back to the place this packet came from. If the packet has no 'optional
* from' or valid signature, this does nothing. This is not associated with a connection, so no
* con stats are updated.
*/
private void sendReset(Packet packet) {
Destination from = packet.getOptionalFrom();
if (from == null) return;
boolean ok = packet.verifySignature(_context, from, null);
if (!ok) {
if (_log.shouldLog(Log.WARN))
_log.warn("Can't send reset after recv spoofed packet: " + packet);
return;
}
PacketLocal reply = new PacketLocal(_context, from);
reply.setFlag(Packet.FLAG_RESET);
reply.setFlag(Packet.FLAG_SIGNATURE_INCLUDED);
reply.setSendStreamId(packet.getReceiveStreamId());
reply.setReceiveStreamId(packet.getSendStreamId());
reply.setOptionalFrom(_manager.getSession().getMyDestination());
// this just sends the packet - no retries or whatnot
_manager.getPacketQueue().enqueue(reply);
}
private void sendReset(Packet packet) {
boolean ok = packet.verifySignature(_context, packet.getOptionalFrom(), null);
if (!ok) {
if (_log.shouldLog(Log.WARN))
_log.warn("Received a spoofed SYN packet: they said they were " + packet.getOptionalFrom());
return;
}
PacketLocal reply = new PacketLocal(_context, packet.getOptionalFrom());
reply.setFlag(Packet.FLAG_RESET);
reply.setFlag(Packet.FLAG_SIGNATURE_INCLUDED);
reply.setAckThrough(packet.getSequenceNum());
reply.setSendStreamId(packet.getReceiveStreamId());
reply.setReceiveStreamId(0);
reply.setOptionalFrom(_manager.getSession().getMyDestination());
if (_log.shouldLog(Log.DEBUG)) _log.debug("Sending RST: " + reply + " because of " + packet);
// this just sends the packet - no retries or whatnot
_manager.getPacketQueue().enqueue(reply);
}
