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CyDhcpServer.h
1 /*
2  * Copyright (c) 2018-2019 ARM Limited
3  * SPDX-License-Identifier: Apache-2.0
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #ifndef WHD_DHCP_SERVER_H
19 #define WHD_DHCP_SERVER_H
20 
21 #include "cy_result.h"
22 #include "cy_syslib.h"
23 #include "cynetwork_utils.h"
24 #include "UDPSocket.h"
25 #include "netsocket/NetworkInterface.h"
26 #include "netsocket/NetworkStack.h"
27 #include "rtos.h"
28 
29 /* DHCP data structure */
30 typedef struct {
31  uint8_t Opcode; /* packet opcode type */
32  uint8_t HwType; /* hardware addr type */
33  uint8_t HwLen; /* hardware addr length */
34  uint8_t Hops; /* gateway hops */
35  uint32_t TransactionId; /* transaction ID */
36  uint16_t SecsElapsed; /* seconds since boot began */
37  uint16_t Flags;
38  uint32_t ClientIpAddr; /* client IP address */
39  uint32_t YourIpAddr; /* 'your' IP address */
40  uint32_t ServerIpAddr; /* server IP address */
41  uint32_t GatewayIpAddr; /* gateway IP address */
42  uint8_t ClientHwAddr[16]; /* client hardware address */
43  uint8_t Legacy[192]; /* SName, File */
44  uint32_t MagicCookie;
45  uint8_t Options[3]; /* options area */
46  /* as of RFC2131 it is variable length */
47 } dhcp_packet_t;
48 
49 #define DHCP_SUBNETMASK_OPTION_CODE (1)
50 #define DHCP_ROUTER_OPTION_CODE (3)
51 #define DHCP_DNS_SERVER_OPTION_CODE (6)
52 #define DHCP_HOST_NAME_OPTION_CODE (12)
53 #define DHCP_MTU_OPTION_CODE (26)
54 #define DHCP_REQUESTED_IP_ADDRESS_OPTION_CODE (50)
55 #define DHCP_LEASETIME_OPTION_CODE (51)
56 #define DHCP_MESSAGETYPE_OPTION_CODE (53)
57 #define DHCP_SERVER_IDENTIFIER_OPTION_CODE (54)
58 #define DHCP_PARAM_REQUEST_LIST_OPTION_CODE (55)
59 #define DHCP_WPAD_OPTION_CODE (252)
60 #define DHCP_END_OPTION_CODE (255)
61 
62 #define DHCP_IP_ADDRESS_CACHE_MAX (5)
63 #define ADDITIONAL_OPTION_BYTES (272)
64 #define DHCP_PACKET_SIZE (sizeof(dhcp_packet_t) + ADDITIONAL_OPTION_BYTES)
65 
66 /** DHCP thread could not be started */
67 #define CY_DHCP_THREAD_CREATION_FAILED CY_RSLT_CREATE(CY_RSLT_TYPE_ERROR, CY_RSLT_MODULE_MIDDLEWARE_BASE, 0)
68 
69 /** Error while trying to stop the DHCP server */
70 #define CY_DHCP_STOP_FAILED CY_RSLT_CREATE(CY_RSLT_TYPE_ERROR, CY_RSLT_MODULE_MIDDLEWARE_BASE, 1)
71 
72 /**
73  * Implementation of a DHCP sever
74  */
75 class CyDhcpServer {
76 public:
77  /**
78  * Create a DHCP server.
79  */
80  CyDhcpServer(NetworkStack *nstack, NetworkInterface *niface);
81 
82  /**
83  * Delete the DHCP server.
84  */
85  virtual ~CyDhcpServer();
86 
87  /**
88  * Start a DHCP server instance.
89  * @return CY_RSLT_SUCCESS on success otherwise error.
90  */
91  cy_rslt_t start(void);
92 
93  /**
94  * Stop a DHCP server instance.
95  * @return CY_RSLT_SUCCESS on success otherwise error.
96  */
97  cy_rslt_t stop(void);
98 
99 private:
100  NetworkStack *_nstack = NULL;
101  NetworkInterface *_niface = NULL;
102  UDPSocket _socket;
103  Thread _thread;
104  bool _running = false;
105 
106  cy_ip_addr_t _available_addr;
107  cy_ip_addr_t _server_addr;
108  cy_ip_addr_t _netmask;
109 
110  cy_mac_addr_t _mac_addr_cache[DHCP_IP_ADDRESS_CACHE_MAX];
111  cy_ip_addr_t _ip_addr_cache[DHCP_IP_ADDRESS_CACHE_MAX];
112  uint8_t _buff[DHCP_PACKET_SIZE];
113 
114  static void threadWrapper(CyDhcpServer *obj);
115  void runServer(void);
116 
117  void setAddress(const cy_mac_addr_t &mac_id, const cy_ip_addr_t &addr);
118  bool lookupAddress(const cy_mac_addr_t &mac_id, cy_ip_addr_t &addr);
119  void freeAddress(const cy_mac_addr_t &mac_id);
120 
121  void handleDiscover(dhcp_packet_t *dhcp);
122  void handleRequest(dhcp_packet_t *dhcp);
123 };
124 
125 #endif /* WHD_DHCP_SERVER_H */
rtos::Thread
The Thread class allow defining, creating, and controlling thread functions in the system...
Definition: Thread.h:92
CyDhcpServer::CyDhcpServer
CyDhcpServer(NetworkStack *nstack, NetworkInterface *niface)
Create a DHCP server.
NetworkStack
NetworkStack class.
Definition: NetworkStack.h:42
NetworkInterface.h
Network Interface base class.
UDPSocket
UDP socket implementation.
Definition: UDPSocket.h:34
CyDhcpServer::start
cy_rslt_t start(void)
Start a DHCP server instance.
cy_ip_addr_t
Definition: cynetwork_utils.h:45
NetworkInterface
Common interface that is shared between network devices.
Definition: NetworkInterface.h:45
CyDhcpServer
Implementation of a DHCP sever.
Definition: CyDhcpServer.h:75
CyDhcpServer::~CyDhcpServer
virtual ~CyDhcpServer()
Delete the DHCP server.
CyDhcpServer::stop
cy_rslt_t stop(void)
Stop a DHCP server instance.
dhcp_packet_t
Definition: CyDhcpServer.h:30
NetworkStack.h
NetworkStack class.
Options
uint8_t Options
Options flags.
Definition: shci.h:536
cy_mac_addr_t
Structure for storing a MAC address (Wi-Fi Media Access Control address).
Definition: cynetwork_utils.h:56
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