mirror of https://github.com/ARMmbed/mbed-os.git
126 lines
4.2 KiB
C++
126 lines
4.2 KiB
C++
/*
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* Copyright (c) 2018-2019 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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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 WHD_DHCP_SERVER_H
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#define WHD_DHCP_SERVER_H
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#include "cy_result.h"
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#include "cy_syslib.h"
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#include "cynetwork_utils.h"
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#include "UDPSocket.h"
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#include "netsocket/NetworkInterface.h"
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#include "netsocket/NetworkStack.h"
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#include "rtos.h"
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/* DHCP data structure */
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typedef struct {
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uint8_t Opcode; /* packet opcode type */
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uint8_t HwType; /* hardware addr type */
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uint8_t HwLen; /* hardware addr length */
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uint8_t Hops; /* gateway hops */
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uint32_t TransactionId; /* transaction ID */
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uint16_t SecsElapsed; /* seconds since boot began */
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uint16_t Flags;
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uint32_t ClientIpAddr; /* client IP address */
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uint32_t YourIpAddr; /* 'your' IP address */
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uint32_t ServerIpAddr; /* server IP address */
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uint32_t GatewayIpAddr; /* gateway IP address */
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uint8_t ClientHwAddr[16]; /* client hardware address */
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uint8_t Legacy[192]; /* SName, File */
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uint32_t MagicCookie;
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uint8_t Options[3]; /* options area */
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/* as of RFC2131 it is variable length */
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} dhcp_packet_t;
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#define DHCP_SUBNETMASK_OPTION_CODE (1)
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#define DHCP_ROUTER_OPTION_CODE (3)
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#define DHCP_DNS_SERVER_OPTION_CODE (6)
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#define DHCP_HOST_NAME_OPTION_CODE (12)
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#define DHCP_MTU_OPTION_CODE (26)
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#define DHCP_REQUESTED_IP_ADDRESS_OPTION_CODE (50)
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#define DHCP_LEASETIME_OPTION_CODE (51)
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#define DHCP_MESSAGETYPE_OPTION_CODE (53)
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#define DHCP_SERVER_IDENTIFIER_OPTION_CODE (54)
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#define DHCP_PARAM_REQUEST_LIST_OPTION_CODE (55)
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#define DHCP_WPAD_OPTION_CODE (252)
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#define DHCP_END_OPTION_CODE (255)
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#define DHCP_IP_ADDRESS_CACHE_MAX (5)
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#define ADDITIONAL_OPTION_BYTES (272)
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#define DHCP_PACKET_SIZE (sizeof(dhcp_packet_t) + ADDITIONAL_OPTION_BYTES)
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/** DHCP thread could not be started */
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#define CY_DHCP_THREAD_CREATION_FAILED CY_RSLT_CREATE(CY_RSLT_TYPE_ERROR, CY_RSLT_MODULE_MIDDLEWARE_BASE, 0)
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/** Error while trying to stop the DHCP server */
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#define CY_DHCP_STOP_FAILED CY_RSLT_CREATE(CY_RSLT_TYPE_ERROR, CY_RSLT_MODULE_MIDDLEWARE_BASE, 1)
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/**
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* Implementation of a DHCP sever
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*/
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class CyDhcpServer {
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public:
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/**
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* Create a DHCP server.
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*/
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CyDhcpServer(NetworkStack *nstack, NetworkInterface *niface);
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/**
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* Delete the DHCP server.
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*/
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virtual ~CyDhcpServer();
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/**
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* Start a DHCP server instance.
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* @return CY_RSLT_SUCCESS on success otherwise error.
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*/
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cy_rslt_t start(void);
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/**
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* Stop a DHCP server instance.
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* @return CY_RSLT_SUCCESS on success otherwise error.
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*/
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cy_rslt_t stop(void);
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private:
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NetworkStack *_nstack = NULL;
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NetworkInterface *_niface = NULL;
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UDPSocket _socket;
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rtos::Thread _thread;
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bool _running = false;
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cy_ip_addr_t _available_addr;
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cy_ip_addr_t _server_addr;
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cy_ip_addr_t _netmask;
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cy_mac_addr_t _mac_addr_cache[DHCP_IP_ADDRESS_CACHE_MAX];
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cy_ip_addr_t _ip_addr_cache[DHCP_IP_ADDRESS_CACHE_MAX];
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uint8_t _buff[DHCP_PACKET_SIZE];
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static void threadWrapper(CyDhcpServer *obj);
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void runServer(void);
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void setAddress(const cy_mac_addr_t &mac_id, const cy_ip_addr_t &addr);
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bool lookupAddress(const cy_mac_addr_t &mac_id, cy_ip_addr_t &addr);
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void freeAddress(const cy_mac_addr_t &mac_id);
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void handleDiscover(dhcp_packet_t *dhcp);
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void handleRequest(dhcp_packet_t *dhcp);
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};
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#endif /* WHD_DHCP_SERVER_H */
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