Initial import.

server/server.go

@@ -0,0 +1,62 @@
+package server
+
+import (
+	"errors"
+	"log"
+	"net"
+)
+
+// github.com/insomniacslk/dhcp
+
+type Config struct {
+	Device string `yaml:"device"`
+}
+
+type Server struct {
+	addrs []net.IP
+	l     net.Listener
+}
+
+func addrsForDevice(dev string) ([]net.IP, error) {
+	netInterface, err := net.InterfaceByName(dev)
+	if err != nil {
+		return nil, err
+	}
+
+	var addrs []net.IP
+	devAddrs, err := netInterface.Addrs()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, addr := range devAddrs {
+		ip := net.ParseIP(addr.String())
+		if ip == nil {
+			continue // address isn't an IP address
+		}
+
+		// DHCP should only listen on private addresses.
+		if !ip.IsPrivate() {
+			continue
+		}
+
+		// only support IPv4 for now
+		if len(ip) != 4 {
+			continue
+		}
+
+		addrs = append(addrs, ip)
+	}
+
+	return addrs, nil
+}
+
+func NewServer(cfg *Config) (*Server, error) {
+	addrs, err := addrsForDevice(cfg.Device)
+	if err != nil {
+		return nil, err
+	}
+
+	log.Println("server IP list: ", addrs)
+	return nil, errors.New("not implemented")
+}