DHCPClient.h

00001 // DHCPClient.h 2013/4/10
00002 #ifndef DHCPCLIENT_H
00003 #define DHCPCLIENT_H
00004 #include "eth_arch.h"
00005 #include "UDPSocket.h"
00006 
00007 #define DHCP_OFFSET_OP 0
00008 #define DHCP_OFFSET_XID 4
00009 #define DHCP_OFFSET_YIADDR 16
00010 #define DHCP_OFFSET_SIADDR 20
00011 #define DHCP_OFFSET_OPTIONS 240
00012 #define DHCP_MAX_PACKET_SIZE 600
00013 
00014 #define DHCP_SERVER_PORT 67
00015 #define DHCP_CLIENT_PORT 68
00016 
00017 // DHCP Message Type
00018 #define DHCPDISCOVER 1
00019 #define DHCPOFFER    2
00020 #define DHCPREQUEST  3
00021 #define DHCPDECLINE  4
00022 #define DHCPACK      5
00023 #define DHCPNAK      6
00024 #define DHCPRELEASE  7
00025 #define DHCPINFORM   8
00026 #define DHCP_MAGIC_COOKIE   0x63825363
00027 #define OPT_PAD             0
00028 #define OPT_SUBNET_MASK         1
00029 #define OPT_TIME_OFFSET         2
00030 #define OPT_ROUTER          3
00031 #define OPT_TIME_SERVER         4
00032 #define OPT_IEN116_NAME_SERVER      5
00033 #define OPT_DNS             6
00034 #define OPT_LOG_SERVER          7
00035 #define OPT_COOKIE_SERVER       8
00036 #define OPT_LPR_SERVER          9
00037 #define OPT_IMPRESS_SERVER      10
00038 #define OPT_RESOURCE_LOC_SERVER     11
00039 #define OPT_HOSTNAME            12
00040 #define OPT_BOOTFILE_SIZE       13
00041 #define OPT_MERIT_DUMP          14
00042 #define OPT_DOMAIN_NAME         15
00043 #define OPT_SWAP_SERVER         16
00044 #define OPT_ROOT_PATH           17
00045 #define OPT_EXTENSIONS_PATH     18
00046 #define OPT_IP_FORWARDING       19
00047 #define OPT_NONLOCAL_SOURCE_ROUTING 20
00048 #define OPT_POLICY_FILTER       21
00049 #define OPT_MAX_DATAGRAM_REASS  22
00050 #define OPT_DEFAULT_IP_TTL      23
00051 #define OPT_PATH_MTU_AGING_TIMEOUT  24
00052 #define OPT_PATH_MTU_PLATEAU_TABLE  25
00053 #define OPT_INTERFACE_MTU       26
00054 #define OPT_ALL_SUBNETS_ARE_LOCAL   27
00055 #define OPT_BROADCAST_ADDR      28
00056 #define OPT_STATIC_ROUTE        33
00057 #define OPT_VENDOR          43
00058 #define OPT_NETBIOS_NAME_SERVER 44
00059 #define OPT_NETBIOS_DATA_DIST   45
00060 #define OPT_NETBIOS_NODE_TYPE   46
00061 #define OPT_NETBIOS_SCOPE       47
00062 #define OPT_IP_ADDR_REQ         50
00063 #define OPT_ADDR_LEASE_TIME     51
00064 #define OPT_DHCP_MESSAGE        53
00065 #define OPT_SERVER_IDENT        54
00066 #define OPT_PARAMETER_REQ       55
00067 #define OPT_RENEWAL_TIME        58
00068 #define OPT_REBINDING_TIME      59
00069 #define OPT_CLIENT_IDENT        61
00070 #define OPT_TFTP_SERVER_NAME        66
00071 #define OPT_BOOTFILE_NAME       67
00072 #define OPT_LDAP_URL            95  /* from draft RFC */
00073 #define OPT_DOMAIN_SEARCH       119 /* from draft RFC 3397 */
00074 
00075 /* site specific options */
00076 #define SITE_HD             252
00077 #define SITE_BF             253
00078 #define SITE_SA             254
00079 #define OPT_END             255
00080 
00081 class DHCPClient {
00082 public:
00083     DHCPClient();
00084     ~DHCPClient();
00085     int setup(const char *hostnane, int timeout_ms = 15*1000);
00086     uint8_t chaddr[6]; // MAC
00087     uint8_t yiaddr[4]; // IP
00088     uint8_t siaddr[4]; // DHCP server
00089     uint8_t dnsaddr[4]; // DNS
00090     uint8_t gateway[4];
00091     uint8_t netmask[4];
00092     uint8_t timesrv[4];
00093     uint8_t leaseTime[4];
00094     char *domainName;
00095 private:
00096     int discover();
00097     int request();
00098     int offer(uint8_t buf[], int size);
00099     void add_buf(uint8_t* buf, int len);
00100     void fill_buf(int len, uint8_t data = 0x00);
00101     void add_buf(uint8_t c);
00102     void add_option(uint8_t code, uint8_t* buf = NULL, int len = 0);
00103     bool verify(uint8_t buf[], int len);
00104     void callback();
00105     UDPSocket* m_udp;
00106     Endpoint m_server;
00107     uint8_t xid[4];
00108     bool exit_flag;
00109     Timer m_interval;
00110     int m_retry;
00111     uint8_t m_buf[DHCP_MAX_PACKET_SIZE];
00112     int m_pos;
00113     const char *_hostname;
00114     WIZnet_Chip* eth;
00115 };
00116 #endif //DHCPCLIENT_H
00117