feat: Working lease manager

types.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"net"
 	"time"
 )
 
@@ -197,20 +196,25 @@ const (
 )
 
 type LeaseState uint8
+type TxId [4]byte
+type Ipv4Addr [4]byte
+type HwAddr [16]byte
+
+var magic = [4]byte{0x63, 0x82, 0x53, 0x63}
 
 type DhcpMessage struct {
 	Op     DhcpOp
 	Htype  MessageType
 	Hlen   byte
 	Hops   byte
-	Xid    uint32
+	Xid    TxId
 	Secs   uint16
 	Flags  uint16
-	Ciaddr uint32
-	Yiaddr uint32
-	Siaddr uint32
-	Giaddr uint32
-	Chaddr [16]byte
+	Ciaddr Ipv4Addr
+	Yiaddr Ipv4Addr
+	Siaddr Ipv4Addr
+	Giaddr Ipv4Addr
+	Chaddr HwAddr
 	Sname  [64]byte
 	File   [128]byte
 	Magic  [4]byte
@@ -222,9 +226,9 @@ const (
 )
 
 type Lease struct {
-	TransactionId uint32
+	TransactionId TxId
 	TTL           time.Time
 	State         LeaseState
-	ClientAddr    [16]byte
-	Address       net.IP
+	ClientAddr    HwAddr
+	Address       Ipv4Addr
 }