Handle TCP, padding, etc.

common.go

@@ -18,7 +18,8 @@ var (
 	ServerMagic            = [8]byte{0x72, 0x36, 0x66, 0x6e, 0x76, 0x57, 0x6a, 0x38}
 	MinDNSPacketSize       = 12
 	MaxDNSPacketSize       = 4096
-	InitialMinQuestionSize = 128
+	MaxDNSUDPPacketSize    = 1252
+	InitialMinQuestionSize = 256
 	TimeoutMin             = 1 * time.Second
 	TimeoutMax             = 5 * time.Second
 )
@@ -36,3 +37,17 @@ type ServerInfo struct {
 func HasTCFlag(packet []byte) bool {
 	return packet[2]&2 == 2
 }
+
+func Min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func Max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}