fix: Fix connection interface binding, JSON lease DB

pkg/types/types.go

@@ -1,5 +1,37 @@
 package types
 
+import (
+	"fmt"
+	"net"
+)
+
 type TxId [4]byte
 type Ipv4Addr [4]byte
 type HwAddr [16]byte
+
+const (
+	ServerPort = 67
+	ClientPort = 68
+)
+
+func Ipv4AddrFromNetIP(ip net.IP) Ipv4Addr {
+	ipv4 := ip.To4()
+	return Ipv4Addr{ipv4[0], ipv4[1], ipv4[2], ipv4[3]}
+}
+
+func (addr Ipv4Addr) ToNetIPv4() net.IP {
+	return net.IPv4(addr[0], addr[1], addr[2], addr[3])
+}
+
+func (addr Ipv4Addr) String() string {
+	return addr.ToNetIPv4().String()
+}
+
+func (addr HwAddr) String() string {
+	return fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5])
+}
+
+func HwAddrFromString(s string) (addr HwAddr, err error) {
+	_, err = fmt.Sscanf(s, "%02x:%02x:%02x:%02x:%02x:%02x", &addr[0], &addr[1], &addr[2], &addr[3], &addr[4], &addr[5])
+	return addr, err
+}