3e979321a5
We mostly follow RFC 2131, which says that secs is the number of seconds "since client began address acquisition or renewal process", and thus set secs to zero on renew. This is different from our current behaviour, which keeps on counting without resetting secs to zero on renew. Bug: 19704592 Change-Id: Ifbb7644094c579be626ffb698eee87047425dbf0
65 lines
2.1 KiB
Java
65 lines
2.1 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.net.dhcp;
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import java.net.Inet4Address;
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import java.nio.ByteBuffer;
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/**
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* This class implements the DHCP-NAK packet.
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*/
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class DhcpNakPacket extends DhcpPacket {
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/**
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* Generates a NAK packet with the specified parameters.
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*/
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DhcpNakPacket(int transId, short secs, Inet4Address clientIp, Inet4Address yourIp,
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Inet4Address nextIp, Inet4Address relayIp,
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byte[] clientMac) {
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super(transId, secs, INADDR_ANY, INADDR_ANY, nextIp, relayIp,
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clientMac, false);
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}
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public String toString() {
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String s = super.toString();
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return s + " NAK, reason " + (mMessage == null ? "(none)" : mMessage);
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}
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/**
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* Fills in a packet with the requested NAK attributes.
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*/
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public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) {
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ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH);
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Inet4Address destIp = mClientIp;
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Inet4Address srcIp = mYourIp;
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fillInPacket(encap, destIp, srcIp, destUdp, srcUdp, result,
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DHCP_BOOTREPLY, mBroadcast);
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result.flip();
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return result;
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}
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/**
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* Adds the optional parameters to the client-generated NAK packet.
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*/
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void finishPacket(ByteBuffer buffer) {
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addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_NAK);
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addTlv(buffer, DHCP_SERVER_IDENTIFIER, mServerIdentifier);
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addTlv(buffer, DHCP_MESSAGE, mMessage);
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addTlvEnd(buffer);
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}
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}
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