init

gold/head/packet.go

@@ -0,0 +1,27 @@
+package head
+
+type Packet struct {
+	Proto   uint8
+	SrcPort uint16
+	DstPort uint16
+	TTL     uint8
+	Data    []byte
+}
+
+func NewPacket(proto uint8, srcPort uint16, dstPort uint16, data []byte) *Packet {
+	return &Packet{
+		Proto:   proto,
+		SrcPort: srcPort,
+		DstPort: dstPort,
+		TTL:     255,
+		Data:    data,
+	}
+}
+
+func (p *Packet) UnMashal(data []byte) {
+
+}
+
+func (p *Packet) Mashal() []byte {
+	return nil
+}

gold/head/protos.go

@@ -0,0 +1,7 @@
+package head
+
+const (
+	ProtoHello uint8 = iota
+	ProtoHelloAck
+	ProtoData
+)

gold/link/crypto.go

@@ -0,0 +1,23 @@
+package link
+
+import "net"
+
+var (
+	privKey [32]byte
+	myip    string
+	me      net.IP
+)
+
+func SetMyself(privateKey [32]byte, myIP string) {
+	privKey = privateKey
+	myip = myIP
+	me = net.ParseIP(myIP)
+}
+
+func (id *Identity) Encode(b []byte) (n int, err error) {
+	return 0, nil
+}
+
+func (id *Identity) Decode(b []byte) (n int, err error) {
+	return 0, nil
+}

gold/link/identify.go

@@ -0,0 +1,9 @@
+package link
+
+type Identity struct {
+	PubicKey  [32]byte
+	EndPoint  string
+	KeepAlive int64
+}
+
+var peers = make(map[string]*Identity)

gold/link/link.go

@@ -0,0 +1,50 @@
+package link
+
+import (
+	"errors"
+	"net"
+
+	"github.com/fumiama/WireGold/gold/head"
+)
+
+type Link struct {
+	conn          net.Conn
+	peer          *Identity
+	hasKeepRuning bool
+}
+
+func Connect(peer string) (l Link, err error) {
+	p, ok := peers[peer]
+	if ok {
+		l.conn, err = net.Dial("udp", peer)
+		l.peer = p
+	} else {
+		err = errors.New("peer not exist")
+	}
+	return
+}
+
+func (l *Link) Close() {
+	l.conn.Close()
+}
+
+func (l *Link) Read(p *head.Packet) (n int, err error) {
+	d := make([]byte, 1024)
+	n, err = l.conn.Read(d)
+	if err == nil {
+		n, err = l.peer.Decode(d)
+		if err == nil {
+			p.UnMashal(d)
+		}
+	}
+	return
+}
+
+func (l *Link) Write(p *head.Packet) (n int, err error) {
+	d := p.Mashal()
+	_, err = l.peer.Encode(d)
+	if err == nil {
+		n, err = l.conn.Write(d)
+	}
+	return
+}

gold/link/nat.go

@@ -0,0 +1,23 @@
+package link
+
+import (
+	"time"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/fumiama/WireGold/gold/head"
+)
+
+func (l *Link) KeepAlive() {
+	if l.peer.KeepAlive > 0 && !l.hasKeepRuning {
+		l.hasKeepRuning = true
+		go func() {
+			t := time.NewTicker(time.Second * time.Duration(l.peer.KeepAlive))
+			for range t.C {
+				_, _ = l.Write(head.NewPacket(head.ProtoHello, 0, 0, nil))
+				logrus.Infoln("[link.nat] send keep alive packet")
+			}
+		}()
+		logrus.Infoln("[link.nat] start to keep alive")
+	}
+}