dhcp.h

基于h323协议的软phone

#ifndef __DHCP_H__
#define __DHCP_H__

#include <inetLib.h>

/**
* port 
*/
#define DHCP_CLIENT_PORT	68
#define DHCP_SERVER_PORT	67
/**
* packet 
*/
#define	BOOT_REQUEST		1
#define BOOT_REPLY			2

#define HTYPE_ETHER			1 
#define ETHER_ADDR_LEN		6

#define ETH_IP				0x0800

#define DHCP_HADDR_LEN		16
#define DHCP_SNAME_LEN		64
#define DHCP_FILE_LEN		128

#define IP_HEADER_LEN		20
#define UDP_HEADER_LEN		8
#define DHCP_UDP_OVERHEAD	(14 + /* Ethernet header */\
				 20 + /* IP header */\
				 8)   /* UDP header */
#define DHCP_FIXED_NON_UDP	236
/* Everything but options. */
#define DHCP_FIXED_LEN		(DHCP_FIXED_NON_UDP + DHCP_UDP_OVERHEAD)
						
#define DHCP_MTU_MAX		1500 /* ethernet */
#define DHCP_MIN_LEN      	548
#define DHCP_OPTION_LEN		(DHCP_MIN_LEN - DHCP_FIXED_NON_UDP)
#define DHCP_MAX_SIZE		576

/* broadcast flag 16 bits */
#define FLAG_BROADCAST		"\x80\x00"

/* magic cookie 99.130.83.99 */
#define DHCP_OPTIONS_COOKIE	"\x63\x82\x53\x63"

#define DHCP_OPTION_INDEX	(4 + 3)

/* DHCP message types */
#define DHCPDISCOVER		1
#define DHCPOFFER			2
#define DHCPREQUEST			3
#define DHCPDECLINE			4
#define DHCPACK				5
#define DHCPNAK				6
#define DHCPRELEASE			7

#define DHCP_SUBMASK_OPTION		1
#define DHCP_ROUTER_OPTION		3	
#define DHCP_REQIP_OPTION		50
#define DHCP_LEASE_OPTION		51
#define DHCP_MSGTYPE_OPTION		53
#define DHCP_SERVERID_OPTION	54
#define DHCP_REQPARAM_OPTION	55
#define DHCP_MAXSIZE_OPTION		57
#define DHCP_CLIENTID_OPTION	61
#define DHCP_HOST_NAME	12
#define DHCP_END_OPTION			255

#define DHCP_OK				1		
#define DHCP_ERROR			-1
#define DHCP_RETRY			0

#define DHCP_TIMEOUT		4

typedef struct {
  	unsigned char op;		/* Message opcode/type */
	unsigned char htype;	/* Hardware addr type */
	unsigned char hlen;		/* Hardware addr length */
	unsigned char hops;		/* Number of relay agent hops from client */
	unsigned int xid;		/* Transaction ID */
	unsigned short secs;		/* Seconds since client started looking */
	unsigned char flags[2];	/* Flag bits */
	struct in_addr ciaddr;	/* Client IP address (if already in use) */
	struct in_addr yiaddr;	/* Client IP address */
	struct in_addr siaddr;	/* IP address of next server to talk to */
	struct in_addr giaddr;	/* DHCP relay agent IP address */
	unsigned char chaddr [DHCP_HADDR_LEN];	/* Client hardware address */
	char sname [DHCP_SNAME_LEN];	/* Server name */
	char file [DHCP_FILE_LEN];	/* Boot filename */
	unsigned char options [DHCP_OPTION_LEN];
				/* Optional parameters (actual length dependent on MTU) */
} s_dhcppacket;

extern int DhcpAllocate();

extern int RequestNewAddr();
extern void InitDhcpServerAddr(unsigned char);

extern int RenewDhcpLease();
extern int RequestPreAddr(int, unsigned char);

extern int InitWithKnownIP();

#endif /* __DHCP_H__ */