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package main
import (
"errors"
"golang.org/x/crypto/blake2s"
"net"
"sync"
"time"
)
const (
OutboundQueueSize = 64
)
type Peer struct {
mutex sync.RWMutex
endpoint *net.UDPAddr
persistentKeepaliveInterval time.Duration // 0 = disabled
keyPairs KeyPairs
handshake Handshake
device *Device
macKey [blake2s.Size]byte // Hash(Label-Mac1 || publicKey)
cookie []byte // cookie
cookieExpire time.Time
queueInbound chan []byte
queueOutbound chan *OutboundWorkQueueElement
queueOutboundRouting chan []byte
}
func (device *Device) NewPeer(pk NoisePublicKey) *Peer {
var peer Peer
// create peer
peer.mutex.Lock()
peer.device = device
peer.keyPairs.Init()
peer.queueOutbound = make(chan *OutboundWorkQueueElement, OutboundQueueSize)
// map public key
device.mutex.Lock()
_, ok := device.peers[pk]
if ok {
panic(errors.New("bug: adding existing peer"))
}
device.peers[pk] = &peer
device.mutex.Unlock()
// precompute DH
handshake := &peer.handshake
handshake.mutex.Lock()
handshake.remoteStatic = pk
handshake.precomputedStaticStatic = device.privateKey.sharedSecret(handshake.remoteStatic)
// compute mac key
peer.macKey = blake2s.Sum256(append([]byte(WGLabelMAC1[:]), handshake.remoteStatic[:]...))
handshake.mutex.Unlock()
peer.mutex.Unlock()
return &peer
}
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