1 files changed, 58 insertions, 0 deletions
diff --git a/src/android/net/dhcp/DhcpReleasePacket.java b/src/android/net/dhcp/DhcpReleasePacket.java
new file mode 100644
index 0000000..3958303
--- /dev/null
+++ b/src/android/net/dhcp/DhcpReleasePacket.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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 android.net.dhcp;
+
+import java.net.Inet4Address;
+import java.nio.ByteBuffer;
+
+/**
+ * Implements DHCP-RELEASE
+ */
+class DhcpReleasePacket extends DhcpPacket {
+
+    final Inet4Address mClientAddr;
+
+    /**
+     * Generates a RELEASE packet with the specified parameters.
+     */
+    public DhcpReleasePacket(int transId, Inet4Address serverId, Inet4Address clientAddr,
+            Inet4Address relayIp, byte[] clientMac) {
+        super(transId, (short)0, clientAddr, INADDR_ANY /* yourIp */, INADDR_ANY /* nextIp */,
+                relayIp, clientMac, false /* broadcast */);
+        mServerIdentifier = serverId;
+        mClientAddr = clientAddr;
+    }
+
+
+    @Override
+    public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) {
+        ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH);
+        fillInPacket(encap, mServerIdentifier /* destIp */, mClientIp /* srcIp */, destUdp, srcUdp,
+                result, DHCP_BOOTREPLY, mBroadcast);
+        result.flip();
+        return result;
+    }
+
+    @Override
+    void finishPacket(ByteBuffer buffer) {
+        addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_RELEASE);
+        addTlv(buffer, DHCP_CLIENT_IDENTIFIER, getClientId());
+        addTlv(buffer, DHCP_SERVER_IDENTIFIER, mServerIdentifier);
+        addCommonClientTlvs(buffer);
+        addTlvEnd(buffer);
+    }
+}