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outside.go
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outside.go
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package wireguard
import (
"fmt"
"log"
"net"
)
type UDPConn interface {
ReadFromUDP(b []byte) (int, *net.UDPAddr, error)
WriteToUDP(b []byte, addr *net.UDPAddr) (int, error)
Close() error
}
type packet struct {
addr *net.UDPAddr
data []byte
}
func (f *Interface) acceptOutsidePackets() {
for {
buf := make([]byte, mtu)
log.Println("wip: f.outside.ReadFromUDP()")
n, addr, err := f.outside.ReadFromUDP(buf)
log.Printf("wip: f.outside.ReadFromUDP() finished: (%d, %+v, %s)", n, addr, err)
if err != nil {
// TODO: figure out what kind of errors can be returned
}
// TODO: fire off a goroutine here
buf = buf[:n]
f.receiveOutsidePacket(packet{addr, buf})
}
}
func (f *Interface) receiveOutsidePacket(p packet) {
log.Printf("received packet: %x\n", p.data)
switch checkMessageType(p.data) {
case messageHandshakeInitiation:
// queue handshake
case messageHandshakeResponse:
log.Println("received messageHandshakeResponse")
f.receiveHandshakePacket(messageHandshakeResponse, p)
case messageHandshakeCookie:
case messageData:
// queue for data processing
default:
if len(p.data) == 0 {
log.Printf("wip: invalid packet: 0 byte packet")
} else if len(p.data) > 0 && p.data[0] != byte(messageData) {
log.Printf("wip: invalid packet: invalid type=%d", p.data[0])
} else {
log.Printf("wip: invalid packet: data packet of size %d is too small (must be >=%d)", len(p.data), messageDataMinLen)
}
}
}
func (f *Interface) receiveHandshakePacket(typ messageType, p packet) {
// TODO: cookie check
var peer *peer
var err error
switch typ {
case messageHandshakeInitiation:
peer, err = f.handshakeConsumeInitiation(p.data)
if err != nil {
// TODO: log error
return
}
peer.updateLatestAddr(p.addr)
res := f.handshakeCreateResponse(&peer.handshake)
_ = res
case messageHandshakeResponse:
peer, err = f.handshakeConsumeResponse(p.data)
if err != nil {
// TODO: log error
return
}
peer.timerEphemeralKeyCreated()
peer.timerHandshakeComplete()
default:
panic(fmt.Sprintf("invalid packet type %d from %s in receiveHandshakePacket", typ, p.addr))
}
peer.rxStats(len(p.data))
peer.timerAnyAuthenticatedPacketReceived()
peer.timerAnyAuthenticatedPacketTraversal()
peer.updateLatestAddr(p.addr)
}