| /* |
| * 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 with the given parameters. Ignore any requests |
| // and discoveries coming on the network interface identified by |
| // |excludeInterface|. |
| DhcpServer(in_addr_t dhcpRangeStart, |
| in_addr_t dhcpRangeEnd, |
| in_addr_t netmask, |
| in_addr_t gateway, |
| 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 getInterfaceAddress(unsigned int interfaceIndex, |
| in_addr_t* address); |
| Result getOfferAddress(unsigned int interfaceIndex, |
| const uint8_t* macAddress, |
| in_addr_t* address); |
| |
| 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. |
| in_addr_t mNextAddressOffset; |
| in_addr_t mDhcpRangeStart; |
| in_addr_t mDhcpRangeEnd; |
| in_addr_t mNetmask; |
| in_addr_t mGateway; |
| std::vector<in_addr_t> mDnsServers; |
| // Map a lease to an IP address for that lease |
| std::unordered_map<Lease, in_addr_t> mLeases; |
| unsigned int mExcludeInterface; |
| }; |
| |