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trace dropped packets in the server

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This commit is contained in:
Marten Seemann 2020-07-09 20:18:33 +07:00
parent 0d4aa4b34f
commit dc245ca6a3
9 changed files with 106 additions and 30 deletions
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23
server.go
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@ -308,6 +308,9 @@ func (s *baseServer) handlePacket(p *receivedPacket) {
case s.receivedPackets <- p:
default:
s.logger.Debugf("Dropping packet from %s (%d bytes). Server receive queue full.", p.remoteAddr, p.Size())
if s.config.Tracer != nil {
s.config.Tracer.DroppedPacket(p.remoteAddr, logging.PacketTypeNotDetermined, p.Size(), logging.PacketDropDOSPrevention)
}
}
}
@ -316,6 +319,9 @@ func (s *baseServer) handlePacketImpl(p *receivedPacket) bool /* should the buff
// The header will then be parsed again.
hdr, _, _, err := wire.ParsePacket(p.data, s.config.ConnectionIDLength)
if err != nil && err != wire.ErrUnsupportedVersion {
if s.config.Tracer != nil {
s.config.Tracer.DroppedPacket(p.remoteAddr, logging.PacketTypeNotDetermined, p.Size(), logging.PacketDropHeaderParseError)
}
s.logger.Debugf("Error parsing packet: %s", err)
return false
}
@ -325,6 +331,9 @@ func (s *baseServer) handlePacketImpl(p *receivedPacket) bool /* should the buff
}
if hdr.Type == protocol.PacketTypeInitial && p.Size() < protocol.MinInitialPacketSize {
s.logger.Debugf("Dropping a packet that is too small to be a valid Initial (%d bytes)", p.Size())
if s.config.Tracer != nil {
s.config.Tracer.DroppedPacket(p.remoteAddr, logging.PacketTypeInitial, p.Size(), logging.PacketDropUnexpectedPacket)
}
return false
}
// send a Version Negotiation Packet if the client is speaking a different protocol version
@ -338,9 +347,12 @@ func (s *baseServer) handlePacketImpl(p *receivedPacket) bool /* should the buff
return true
} else if hdr.Type != protocol.PacketTypeInitial {
// Drop long header packets.
// There's litte point in sending a Stateless Reset, since the client
// There's little point in sending a Stateless Reset, since the client
// might not have received the token yet.
s.logger.Debugf("Dropping long header packet of type %s (%d bytes)", hdr.Type, len(p.data))
if s.config.Tracer != nil {
s.config.Tracer.DroppedPacket(p.remoteAddr, logging.PacketTypeFromHeader(hdr), p.Size(), logging.PacketDropUnexpectedPacket)
}
return false
}
}
@ -358,6 +370,9 @@ func (s *baseServer) handlePacketImpl(p *receivedPacket) bool /* should the buff
func (s *baseServer) handleInitialImpl(p *receivedPacket, hdr *wire.Header) error {
if len(hdr.Token) == 0 && hdr.DestConnectionID.Len() < protocol.MinConnectionIDLenInitial {
p.buffer.Release()
if s.config.Tracer != nil {
s.config.Tracer.DroppedPacket(p.remoteAddr, logging.PacketTypeInitial, p.Size(), logging.PacketDropUnexpectedPacket)
}
return errors.New("too short connection ID")
}
@ -549,12 +564,18 @@ func (s *baseServer) maybeSendInvalidToken(p *receivedPacket, hdr *wire.Header)
data := p.data[:hdr.ParsedLen()+hdr.Length]
extHdr, err := unpackHeader(opener, hdr, data, hdr.Version)
if err != nil {
if s.config.Tracer != nil {
s.config.Tracer.DroppedPacket(p.remoteAddr, logging.PacketTypeInitial, p.Size(), logging.PacketDropHeaderParseError)
}
// don't return the error here. Just drop the packet.
return nil
}
hdrLen := extHdr.ParsedLen()
if _, err := opener.Open(data[hdrLen:hdrLen], data[hdrLen:], extHdr.PacketNumber, data[:hdrLen]); err != nil {
// don't return the error here. Just drop the packet.
if s.config.Tracer != nil {
s.config.Tracer.DroppedPacket(p.remoteAddr, logging.PacketTypeInitial, p.Size(), logging.PacketDropPayloadDecryptError)
}
return nil
}
if s.logger.Debug() {