Add KCP support (#788)

Add KCP support for shadowsocks.

KCPTUN should be setup on a different port to avoid conflicts with Shadowsocks' UDP support.

src/main/scala/com/github/shadowsocks/database/DBHelper.scala

@@ -64,7 +64,7 @@ object DBHelper {
 }
 
 class DBHelper(val context: Context)
-  extends OrmLiteSqliteOpenHelper(context, DBHelper.PROFILE, null, 16) {
+  extends OrmLiteSqliteOpenHelper(context, DBHelper.PROFILE, null, 18) {
   import DBHelper._
 
   lazy val profileDao: Dao[Profile, Int] = getDao(classOf[Profile])
@@ -125,6 +125,15 @@ class DBHelper(val context: Context)
       if (oldVersion < 16) {
         profileDao.executeRawNoArgs("UPDATE `profile` SET route = 'bypass-lan-china' WHERE route = 'bypass-china'")
       }
+
+      if (oldVersion < 17) {
+        profileDao.executeRawNoArgs("ALTER TABLE `profile` ADD COLUMN kcp SMALLINT;")
+        profileDao.executeRawNoArgs("ALTER TABLE `profile` ADD COLUMN kcpcli VARCHAR;")
+      }
+
+      if (oldVersion < 18) {
+        profileDao.executeRawNoArgs("ALTER TABLE `profile` ADD COLUMN kcpPort INTEGER;")
+      }
     }
   }
 }

src/main/scala/com/github/shadowsocks/database/Profile.scala

@@ -99,6 +99,15 @@ class Profile {
   @DatabaseField
   var userOrder: Long = _
 
+  @DatabaseField
+  var kcp: Boolean = false
+
+  @DatabaseField
+  var kcpPort: Int = 8399
+
+  @DatabaseField
+  var kcpcli: String = ""
+
   override def toString = "ss://" + Base64.encodeToString("%s%s:%s@%s:%d".formatLocal(Locale.ENGLISH,
     method, if (auth) "-auth" else "", password, host, remotePort).getBytes, Base64.NO_PADDING | Base64.NO_WRAP)