protocol: add UDP and TCP ports

Signed-off-by: Maciek Borzecki <maciek.borzecki@gmail.com>

protocol/ports.go

@@ -0,0 +1,35 @@
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+package protocol
+
+import (
+	"net"
+)
+
+const (
+	// UDPPort is the UDP port used for discovery
+	UDPPort = 1716
+	// UDPPortOld is the UDP port used by older versions of the protocol
+	UDPPortOld = 1714
+	// TCPPortMin is the minimum TCP port number
+	TCPPortMin = 1716
+
+	PayloadTransferPortMin = 1739
+)
+
+var (
+	// UDPDiscoveryAddr is the UDP address used for discovery
+	UDPDiscoveryAddr = &net.UDPAddr{
+		Port: UDPPort,
+		IP:   net.ParseIP("255.255.255.255"),
+	}
+)