105 lines
3 KiB
C++
105 lines
3 KiB
C++
//
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// Copyright (C) 2015 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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#ifndef DHCP_CLIENT_DHCPV4_H_
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#define DHCP_CLIENT_DHCPV4_H_
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#include <random>
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#include <string>
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#include <base/macros.h>
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#include <base/strings/stringprintf.h>
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#include <shill/net/byte_string.h>
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#include <shill/net/io_handler_factory_container.h>
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#include <shill/net/sockets.h>
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#include "dhcp_client/dhcp.h"
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#include "dhcp_client/dhcp_message.h"
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#include "dhcp_client/event_dispatcher_interface.h"
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namespace dhcp_client {
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class DHCPV4 : public DHCP {
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public:
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DHCPV4(const std::string& interface_name,
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const shill::ByteString& hardware_address,
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unsigned int interface_index,
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const std::string& network_id,
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bool request_hostname,
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bool arp_gateway,
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bool unicast_arp,
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EventDispatcherInterface* event_dispatcher);
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virtual ~DHCPV4();
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bool Start();
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void Stop();
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private:
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bool CreateRawSocket();
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bool MakeRawPacket(const DHCPMessage& message, shill::ByteString* buffer);
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void OnReadError(const std::string& error_msg);
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void ParseRawPacket(shill::InputData* data);
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bool SendRawPacket(const shill::ByteString& buffer);
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// Validate the IP and UDP header and return the total headers length.
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// Return -1 if any header is invalid.
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int ValidatePacketHeader(const unsigned char* buffer, size_t len);
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void HandleOffer(const DHCPMessage& msg);
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void HandleAck(const DHCPMessage& msg);
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void HandleNak(const DHCPMessage& msg);
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// Interface parameters.
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std::string interface_name_;
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shill::ByteString hardware_address_;
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unsigned int interface_index_;
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// Unique network/connection identifier,
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// lease will persist to storage if this identifier is specified.
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std::string network_id_;
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// DHCP IPv4 configurations:
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// Request hostname from server.
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bool request_hostname_;
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// ARP for default gateway.
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bool arp_gateway_;
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// Enable unicast ARP on renew.
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bool unicast_arp_;
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EventDispatcherInterface* event_dispatcher_;
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shill::IOHandlerFactory *io_handler_factory_;
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std::unique_ptr<shill::IOHandler> input_handler_;
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// DHCP state variables.
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State state_;
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uint32_t server_identifier_;
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uint32_t transaction_id_;
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uint32_t from_;
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uint32_t to_;
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// Socket used for sending and receiving DHCP messages.
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int socket_;
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// Helper class with wrapped socket relavent functions.
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std::unique_ptr<shill::Sockets> sockets_;
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std::default_random_engine random_engine_;
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DISALLOW_COPY_AND_ASSIGN(DHCPV4);
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};
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} // namespace dhcp_client
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#endif // DHCP_CLIENT_DHCPV4_H_
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