Port entrance server to Go

entranceserver/entrance_server.go

@@ -0,0 +1,80 @@
+package entranceserver
+
+import (
+	"encoding/hex"
+	"fmt"
+	"io"
+	"net"
+
+	"github.com/Andoryuuta/Erupe/network"
+)
+
+func handleEntranceServerConnection(conn net.Conn) {
+	// Client initalizes the connection with a one-time buffer of 8 NULL bytes.
+	nullInit := make([]byte, 8)
+	n, err := io.ReadFull(conn, nullInit)
+	if err != nil {
+		fmt.Println(err)
+		return
+	} else if n != len(nullInit) {
+		fmt.Println("io.ReadFull couldn't read the full 8 byte init.")
+		return
+	}
+
+	cc := network.NewCryptConn(conn)
+	for {
+		pkt, err := cc.ReadPacket()
+		if err != nil {
+			return
+		}
+
+		fmt.Printf("Got entrance server command:\n%s\n", hex.Dump(pkt))
+
+		data := makeResp([]ServerInfo{
+			ServerInfo{
+				IP:                 net.ParseIP("127.0.0.1"),
+				Unk2:               0,
+				Type:               1,
+				Season:             0,
+				Unk6:               3,
+				Name:               "AErupe Server in Go! @localhost",
+				AllowedClientFlags: 4096,
+				Channels: []ChannelInfo{
+					ChannelInfo{
+						Port:           54001,
+						MaxPlayers:     100,
+						CurrentPlayers: 3,
+						Unk4:           0,
+						Unk5:           0,
+						Unk6:           0,
+						Unk7:           0,
+						Unk8:           0,
+						Unk9:           0,
+						Unk10:          319,
+						Unk11:          248,
+						Unk12:          159,
+						Unk13:          12345,
+					},
+				},
+			},
+		})
+		cc.SendPacket(data)
+
+	}
+}
+
+func DoEntranceServer(listenAddr string) {
+	l, err := net.Listen("tcp", listenAddr)
+	if err != nil {
+		panic(err)
+	}
+	defer l.Close()
+
+	for {
+		conn, err := l.Accept()
+		if err != nil {
+			panic(err)
+		}
+		go handleEntranceServerConnection(conn)
+	}
+}