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1 /* |
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2 * Copyright 2011 Tomas Zeman <tzeman@volny.cz> |
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3 * |
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4 * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 * you may not use this file except in compliance with the License. |
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6 * You may obtain a copy of the License at |
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7 * |
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8 * http://www.apache.org/licenses/LICENSE-2.0 |
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9 * |
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10 * Unless required by applicable law or agreed to in writing, software |
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11 * distributed under the License is distributed on an "AS IS" BASIS, |
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12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 * See the License for the specific language governing permissions and |
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14 * limitations under the License. |
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15 */ |
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16 package net.tz.ip |
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17 |
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18 import net.liftweb.common._ |
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19 import net.liftweb.util.Helpers._ |
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20 |
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21 case class IpNetwork(from: IpAddress, to: IpAddress) { |
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22 require(from.v == to.v, "IpAddresses must be of the same version") |
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23 |
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24 lazy val v = from.v |
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25 lazy val mask = from.v.ones ^ from.toBigInt ^ to.toBigInt |
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26 lazy val size = to.toBigInt - from.toBigInt + 1 |
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27 lazy val maskLen = mask bitCount |
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28 lazy val maskIp = IpAddress(v, mask) |
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29 |
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30 override def toString = maskIp map { _ => from + "/" + maskLen } openOr |
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31 (from + "-" + to) |
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32 } |
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33 |
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34 object IpNetwork { |
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35 def apply(net: String, maskLen: Int): Box[IpNetwork] = for { |
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36 ip <- IpAddress(net) |
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37 n <- apply(ip, maskLen) |
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38 } yield { n } |
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39 |
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40 def apply(net: IpAddress, maskLen: Int): Box[IpNetwork] = { |
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41 require(net.v.bits >= maskLen, |
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42 "MaskLen must be less or equal to IP length") |
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43 val hm = BigInt(2).pow(net.v.bits - maskLen) - 1 // host mask |
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44 val m = net.v.ones &~ hm // net mask |
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45 val f = net.toBigInt & m |
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46 val t = net.toBigInt | hm |
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47 for { |
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48 from <- IpAddress(net.v, f) |
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49 to <- IpAddress(net.v, t) |
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50 } yield { IpNetwork(from, to) } |
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51 } |
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52 } |
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53 |
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54 // vim: set ts=2 sw=2 et: |