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/*
* Copyright 2017, 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.
*/
#pragma once
#include "lease.h"
#include "result.h"
#include "socket.h"
#include <netinet/in.h>
#include <stdint.h>
#include <unordered_map>
#include <vector>
class Message;
class DhcpServer {
public:
// Construct a DHCP server. Ignore any requests and discoveries coming on
// the network interface identified by |excludeInterface|.
explicit DhcpServer(unsigned int excludeInterface);
Result init();
Result run();
private:
Result sendMessage(unsigned int interfaceIndex,
in_addr_t sourceAddress,
const Message& message);
void sendDhcpOffer(const Message& message, unsigned int interfaceIndex);
void sendAck(const Message& message, unsigned int interfaceIndex);
void sendNack(const Message& message, unsigned int interfaceIndex);
bool isValidDhcpRequest(const Message& message,
unsigned int interfaceIndex);
void updateDnsServers();
Result getInterfaceData(unsigned int interfaceIndex,
unsigned long type,
struct ifreq* response);
Result getInterfaceAddress(unsigned int interfaceIndex,
in_addr_t* address);
Result getInterfaceNetmask(unsigned int interfaceIndex,
in_addr_t* netmask);
Result getOfferAddress(unsigned int interfaceIndex,
const uint8_t* macAddress,
in_addr_t* address,
in_addr_t* netmask,
in_addr_t* gateway);
Socket mSocket;
// This is the next address offset. This will be added to whatever the base
// address of the DHCP address range is. For each new MAC address seen this
// value will increase by one.
std::vector<in_addr_t> mDnsServers;
// Map a lease to an IP address for that lease
std::unordered_map<Lease, in_addr_t> mLeases;
std::unordered_map<unsigned int, in_addr_t> mNextAddressOffsets;
unsigned int mExcludeInterface;
};
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