| // |
| // Copyright (C) 2015 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. |
| // |
| |
| #ifndef DHCP_CLIENT_DHCPV4_H_ |
| #define DHCP_CLIENT_DHCPV4_H_ |
| |
| #include <random> |
| #include <string> |
| |
| #include <base/cancelable_callback.h> |
| #include <base/macros.h> |
| #include <base/memory/weak_ptr.h> |
| #include <base/strings/stringprintf.h> |
| #include <shill/net/byte_string.h> |
| #include <shill/net/io_handler_factory_container.h> |
| #include <shill/net/sockets.h> |
| |
| #include "dhcp_client/dhcp.h" |
| #include "dhcp_client/dhcp_message.h" |
| #include "dhcp_client/event_dispatcher_interface.h" |
| |
| namespace dhcp_client { |
| |
| class DHCPV4 : public DHCP { |
| public: |
| DHCPV4(const std::string& interface_name, |
| const shill::ByteString& hardware_address, |
| unsigned int interface_index, |
| const std::string& network_id, |
| bool request_hostname, |
| bool arp_gateway, |
| bool unicast_arp, |
| EventDispatcherInterface* event_dispatcher); |
| |
| virtual ~DHCPV4(); |
| |
| bool Start(); |
| void Stop(); |
| |
| private: |
| bool CreateRawSocket(); |
| bool MakeRawPacket(const DHCPMessage& message, shill::ByteString* buffer); |
| void OnReadError(const std::string& error_msg); |
| void ParseRawPacket(shill::InputData* data); |
| bool SendDiscover(); |
| bool SendRequest(); |
| bool SendRelease(); |
| bool SendRawPacket(const shill::ByteString& buffer); |
| // Validate the IP and UDP header and return the total headers length. |
| // Return -1 if any header is invalid. |
| int ValidatePacketHeader(const unsigned char* buffer, size_t len); |
| bool ValidateOptions(const DHCPMessage& msg); |
| void ResetStateVariables(); |
| |
| const std::string IPtoString(uint32_t ip); |
| |
| void HandleOffer(const DHCPMessage& msg); |
| void HandleAck(const DHCPMessage& msg); |
| void HandleNak(const DHCPMessage& msg); |
| |
| // Handle the case that it is time for a renewal process. |
| void RenewalTask(); |
| // Handle the case that the client didn't reiceive a timely |
| // renewal responese from server. Therefore it is time for |
| // a rebinding process. |
| void RebindTask(); |
| // Interface parameters. |
| std::string interface_name_; |
| shill::ByteString hardware_address_; |
| unsigned int interface_index_; |
| |
| // Unique network/connection identifier, |
| // lease will persist to storage if this identifier is specified. |
| std::string network_id_; |
| |
| // DHCP IPv4 configurations: |
| // Request hostname from server. |
| bool request_hostname_; |
| // ARP for default gateway. |
| bool arp_gateway_; |
| // Enable unicast ARP on renew. |
| bool unicast_arp_; |
| |
| EventDispatcherInterface* event_dispatcher_; |
| shill::IOHandlerFactory *io_handler_factory_; |
| std::unique_ptr<shill::IOHandler> input_handler_; |
| base::WeakPtrFactory<DHCPV4> weak_ptr_factory_; |
| |
| // DHCP state variables. |
| State state_; |
| uint32_t server_identifier_; |
| uint32_t transaction_id_; |
| uint32_t offered_ip_address_; |
| uint32_t subnet_mask_; |
| // Client IP address. |
| // It can be either a bounded ip address or an INADDR_ANY constant. |
| uint32_t client_ip_; |
| // Server IP address. |
| // It can be either a bounded server address or an INADDR_BROADCAST constant. |
| uint32_t server_ip_; |
| |
| // Timeout callbacks. |
| base::CancelableClosure renewal_task_callback_; |
| base::CancelableClosure rebind_task_callback_; |
| |
| // Socket used for sending and receiving DHCP messages. |
| int socket_; |
| // Helper class with wrapped socket relavent functions. |
| std::unique_ptr<shill::Sockets> sockets_; |
| |
| std::default_random_engine random_engine_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DHCPV4); |
| }; |
| |
| } // namespace dhcp_client |
| |
| #endif // DHCP_CLIENT_DHCPV4_H_ |