func (srv *HopServer) forwardFrames() {
// packet map
srv.pktHandle = map[byte](func(*udpPacket, *HopPacket)){
HOP_FLG_PSH: srv.handleKnock,
HOP_FLG_PSH | HOP_FLG_ACK: srv.handleHeartbeatAck,
HOP_FLG_HSH: srv.handleHandshake,
HOP_FLG_HSH | HOP_FLG_ACK: srv.handleHandshakeAck,
HOP_FLG_DAT: srv.handleDataPacket,
HOP_FLG_DAT | HOP_FLG_MFR: srv.handleDataPacket,
HOP_FLG_FIN: srv.handleFinish,
}
for {
select {
case pack := <-srv.fromIface:
// logger.Debug("New iface Frame")
// first byte is left for opcode
frame := pack[HOP_HDR_LEN:]
dest := waterutil.IPv4Destination(frame).To4()
mkey := ip4_uint64(dest)
// logger.Debug("ip dest: %v", dest)
if hpeer, found := srv.peers[mkey]; found {
srv.bufferToClient(hpeer, pack)
} else {
logger.Warning("client peer with key %d not found", mkey)
}
case packet := <-srv.fromNet:
srv.handlePacket(packet)
}
}
}
func (srv *HopServer) forwardFrames() {
// packet map
pktHandle := map[byte](func(*udpPacket, *HopPacket)){
HOP_FLG_PSH: srv.handleKnock,
HOP_FLG_HSH: srv.handleHandshake,
HOP_FLG_HSH | HOP_FLG_ACK: srv.handleHandshakeAck,
HOP_FLG_DAT: srv.handleDataPacket,
HOP_FLG_DAT | HOP_FLG_MFR: srv.handleDataPacket,
HOP_FLG_FIN: srv.handleFinish,
}
for {
select {
case pack := <-srv.fromIface:
// logger.Debug("New iface Frame")
// first byte is left for opcode
frame := pack[HOP_HDR_LEN:]
dest := waterutil.IPv4Destination(frame).To4()
mkey := ip4_uint64(dest)
// logger.Debug("ip dest: %v", dest)
if hpeer, found := srv.peers[mkey]; found {
srv.bufferToClient(hpeer, pack)
} else {
logger.Warning("client peer with key %d not found", mkey)
}
case packet := <-srv.fromNet:
hPack, err := unpackHopPacket(packet.data)
if err == nil {
// logger.Debug("New UDP Packet from: %v", packet.addr)
if handle_func, ok := pktHandle[hPack.Flag]; ok {
handle_func(packet, hPack)
} else {
logger.Error("Unkown flag: %x", hPack.Flag)
}
} else {
logger.Error(err.Error())
}
}
}
}
func (srv *HopServer) forwardFrames() {
for {
select {
case frame := <-srv.ifaceInput:
ethertype := waterutil.MACEthertype(frame)
logger.Debug("New frame from channel")
switch ethertype {
case waterutil.IPv4:
packet := waterutil.MACPayload(frame)
if waterutil.IsIPv4(packet) {
vaddr := waterutil.IPv4Destination(packet)
key := binary.BigEndian.Uint32(([]byte)(vaddr))
if raddr, ok := srv.natTable[key]; ok {
if idx, ok := srv.clientChannel[raddr]; ok {
uPacket := &udpPacket{raddr, frame, idx}
srv.netOutputs[idx] <- uPacket
}
}
logger.Debug("Source: %v [%v]", waterutil.MACSource(frame), waterutil.IPv4Source(packet))
logger.Debug("Destination: %v [%v]", waterutil.MACDestination(frame), waterutil.IPv4Destination(packet))
logger.Debug("Protocol: %v\n", waterutil.IPv4Protocol(packet))
}
case waterutil.ARP:
dest := waterutil.MACDestination(frame)
logger.Debug("Mac Destionation: %v", dest)
key := mac2uint64(dest)
if raddr, ok := srv.macTable[key]; ok {
if idx, ok := srv.clientChannel[raddr]; ok {
uPacket := &udpPacket{raddr, frame, idx}
srv.netOutputs[idx] <- uPacket
}
}
}
case packet := <-srv.netInput:
logger.Debug("New UDP Packet from: %v", packet.addr)
srv.clientChannel[packet.addr] = packet.channel
srv.iface.Write(packet.data)
frame := packet.data
ethertype := waterutil.MACEthertype(frame)
macSrc := waterutil.MACSource(frame)
logger.Debug("Mac Source: %v", macSrc)
key := mac2uint64(macSrc)
srv.macTable[key] = packet.addr
if ethertype == waterutil.IPv4 {
ipPack := waterutil.MACPayload(frame)
vaddr := waterutil.IPv4Source(ipPack)
key := binary.BigEndian.Uint32(([]byte)(vaddr))
srv.natTable[key] = packet.addr
if waterutil.IsIPv4(ipPack) {
logger.Debug("Source: %v [%v]", waterutil.MACSource(frame), waterutil.IPv4Source(ipPack))
logger.Debug("Destination: %v [%v]", waterutil.MACDestination(frame), waterutil.IPv4Destination(ipPack))
}
}
}
}
}
