📄 dhcp.c

📁 用MCS51 单片机的TCIP协议的测试,很基本的程序,对新手可能有帮助!
💻 C
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#include "config.h"
#include "serial.h"
#include "socket.h"
#include "dhcp.h"
#include "init.h"
#include "eeprom.h"

//#define DHCP_DEBUG
RIP_MSG xdata MSG _at_ 0x7d00;
extern u_char xdata Mac[6]; //
extern bit Debug_Off;
extern bit Enable_DHCP_Timer;

u_char xdata SubMask[4];
u_char xdata Gateway[4];
u_char xdata IpAddr[4];

u_char xdata DNS[4];
u_char xdata OLD_SIP[4];

u_char xdata DHCPS_IP[4];
u_int  xdata S_port;				// DHCP Server Port Number

un_l2cval xdata lease_time;
u_long xdata my_time, next_time;
u_char xdata dhcp_state;
u_char xdata retry_count = 0;
u_char xdata DHCP_Timeout = 0;

u_long xdata DHCP_XID;


/*
********************************************************************************
* Description : Send DHCP discover message 
* Arguments   : s - socket number
* Returns     : None
* Note        : 
********************************************************************************
*/
void send_DHCP_DISCOVER(SOCKET s)
{
	u_int i;
	u_char addr[4];

	MSG.op = DHCP_BOOTREQUEST;
	MSG.htype = DHCP_HTYPE10MB;
	MSG.hlen = DHCP_HLENETHERNET;
	MSG.hops = DHCP_HOPS;
	MSG.xid = DHCP_XID;
	MSG.secs = DHCP_SECS;
	MSG.flags = DHCP_FLAGSBROADCAST;

	MSG.ciaddr[0] = 0;
	MSG.ciaddr[1] = 0;
	MSG.ciaddr[2] = 0;
	MSG.ciaddr[3] = 0;

	MSG.yiaddr[0] = 0;
	MSG.yiaddr[1] = 0;
	MSG.yiaddr[2] = 0;
	MSG.yiaddr[3] = 0;

	MSG.siaddr[0] = 0;
	MSG.siaddr[1] = 0;
	MSG.siaddr[2] = 0;
	MSG.siaddr[3] = 0;

	MSG.giaddr[0] = 0;
	MSG.giaddr[1] = 0;
	MSG.giaddr[2] = 0;
	MSG.giaddr[3] = 0;

	// setting default Mac Address Value.
	MSG.chaddr[0] = Mac[0];
	MSG.chaddr[1] = Mac[1];
	MSG.chaddr[2] = Mac[2];
	MSG.chaddr[3] = Mac[3];
	MSG.chaddr[4] = Mac[4];
	MSG.chaddr[5] = Mac[5];
	
	for (i = 6; i < 16; i++) MSG.chaddr[i] = 0;
	for (i = 0; i < 64; i++) MSG.sname[i] = 0;
	for (i = 0; i < 128; i++) MSG.file[i] = 0;

	// MAGIC_COOKIE
	MSG.OPT[0] = MAGIC0;
	MSG.OPT[1] = MAGIC1;
	MSG.OPT[2] = MAGIC2;
	MSG.OPT[3] = MAGIC3;
	
	// Option Request Param.
	MSG.OPT[4] = dhcpMessageType;
	MSG.OPT[5] = 0x01;
	MSG.OPT[6] = DHCP_DISCOVER;
	MSG.OPT[7] = dhcpParamRequest;
	MSG.OPT[8] = 0x05;
	MSG.OPT[9] = subnetMask;
	MSG.OPT[10] = routersOnSubnet;
	MSG.OPT[11] = dns;
	MSG.OPT[12] = dhcpT1value;
	MSG.OPT[13] = dhcpT2value;
	MSG.OPT[14] = endOption;

	// Null Padding
	for (i = 15; i < 312; i++) MSG.OPT[i] = 0;

	/* DST IP : BroadCasting*/
	S_port = DHCP_SERVER_PORT;
	for (i=0; i<4; i++) addr[i] = 0xFF;	

	#ifdef DHCP_DEBUG
		PutString("send_DHCP_DISCOVER : ");
	#endif

	sendto(s, (UCHAR *)(&MSG.op), RIP_MSG_SIZE, addr, S_port);
	
	#ifdef DHCP_DEBUG
		PutStringLn("OK");
	#endif
}

/*
********************************************************************************
* Description : Send DHCP request message
* Arguments   : s - socket number
* Returns     : None
* Note        : 
********************************************************************************
*/
void send_DHCP_REQUEST(SOCKET s)
{
	u_int i;
	u_char addr[4];

	MSG.op = DHCP_BOOTREQUEST;
	MSG.htype = DHCP_HTYPE10MB;
	MSG.hlen = DHCP_HLENETHERNET;
	MSG.hops = DHCP_HOPS;
	MSG.xid = DHCP_XID;
	MSG.secs = DHCP_SECS;
	MSG.flags = DHCP_FLAGSBROADCAST;

	MSG.ciaddr[0] = 0;
	MSG.ciaddr[1] = 0;
	MSG.ciaddr[2] = 0;
	MSG.ciaddr[3] = 0;

	MSG.yiaddr[0] = 0;
	MSG.yiaddr[1] = 0;
	MSG.yiaddr[2] = 0;
	MSG.yiaddr[3] = 0;

	MSG.siaddr[0] = 0;
	MSG.siaddr[1] = 0;
	MSG.siaddr[2] = 0;
	MSG.siaddr[3] = 0;

	MSG.giaddr[0] = 0;
	MSG.giaddr[1] = 0;
	MSG.giaddr[2] = 0;
	MSG.giaddr[3] = 0;

	MSG.chaddr[0] = Mac[0];
	MSG.chaddr[1] = Mac[1];
	MSG.chaddr[2] = Mac[2];
	MSG.chaddr[3] = Mac[3];
	MSG.chaddr[4] = Mac[4];
	MSG.chaddr[5] = Mac[5];

	for (i = 6; i < 16; i++) MSG.chaddr[i] = 0;
	for (i = 0; i < 64; i++) MSG.sname[i] = 0;
	for (i = 0; i < 128; i++) MSG.file[i] = 0;

	// MAGIC_COOKIE
	MSG.OPT[0] = MAGIC0;
	MSG.OPT[1] = MAGIC1;
	MSG.OPT[2] = MAGIC2;
	MSG.OPT[3] = MAGIC3;

	// Option Request Param.
	MSG.OPT[4] = dhcpMessageType;
	MSG.OPT[5] = 0x01;
	MSG.OPT[6] = DHCP_REQUEST;

	MSG.OPT[7] = dhcpClientIdentifier;
	MSG.OPT[8] = 0x07;
	MSG.OPT[9] = 0x01;
	MSG.OPT[10] = Mac[0];
	MSG.OPT[11] = Mac[1];
	MSG.OPT[12] = Mac[2];
	MSG.OPT[13] = Mac[3];
	MSG.OPT[14] = Mac[4];
	MSG.OPT[15] = Mac[5];

	MSG.OPT[16] = dhcpRequestedIPaddr;
	MSG.OPT[17] = 0x04;
	MSG.OPT[18] = IpAddr[0];
	MSG.OPT[19] = IpAddr[1];
	MSG.OPT[20] = IpAddr[2];
	MSG.OPT[21] = IpAddr[3];

	MSG.OPT[22] = dhcpServerIdentifier;
	MSG.OPT[23] = 0x04;
	MSG.OPT[24] = DHCPS_IP[0];
	MSG.OPT[25] = DHCPS_IP[1];
	MSG.OPT[26] = DHCPS_IP[2];
	MSG.OPT[27] = DHCPS_IP[3];

	MSG.OPT[28] = hostName;
	MSG.OPT[29] = 0x0C;
	MSG.OPT[30] = 'I';
	MSG.OPT[31] = 'I';
	MSG.OPT[32] = 'M';
	MSG.OPT[33] = '7';
	MSG.OPT[34] = '1';
	MSG.OPT[35] = '0';
	MSG.OPT[36] = Mac[0];
	MSG.OPT[37] = Mac[1];
	MSG.OPT[38] = Mac[2];
	MSG.OPT[39] = Mac[3];
	MSG.OPT[40] = Mac[4];
	MSG.OPT[41] = Mac[5];
	
	MSG.OPT[42] = dhcpParamRequest;
	MSG.OPT[43] = 0x05;
	MSG.OPT[44] = subnetMask;
	MSG.OPT[45] = routersOnSubnet;

	MSG.OPT[46] = dns;
	MSG.OPT[47] = dhcpT1value;
	MSG.OPT[48] = dhcpT2value;
	MSG.OPT[49] = endOption;

	for (i = 50; i < 312; i++) MSG.OPT[i] = 0;

	/* DST IP : BroadCasting*/
	S_port = DHCP_SERVER_PORT;
	for (i=0; i<4; i++) addr[i] = 0xFF;	
	
#ifdef DHCP_DEBUG
	PutStringLn("send_DHCP_REQUEST");
#endif	
	
	sendto(s, (UCHAR *)(&MSG.op), RIP_MSG_SIZE, addr, S_port);
}

/*
********************************************************************************
* Description : DHCP message parsing routine
* Arguments   : s - socket number, length - receive data size
* Returns     : message type
* Note        : 
********************************************************************************
*/
char parseDHCPMSG(SOCKET s, UINT length)
{
	u_char ServerAddrIn[4];
	u_int  ServerPort;

	UINT len;
	UCHAR type,i,opt_len;
	UCHAR xdata* p;
	UCHAR xdata* e;

	len = recvfrom(s, (UCHAR*)&MSG.op, length, ServerAddrIn, &ServerPort);

	if (ServerPort == DHCP_SERVER_PORT)
	{
/*		
#ifdef DHCP_DEBUG
		PutString("\n\r DHCP MSG received : len = ");PutHTOA(len);
		PutString("\n\r MAC : ");
		for (i = 0; i < 6; i++) {
			PutHTOA(Mac[i]);PutByte(' ');
		}
#endif	
*/
		for (i = 0; i < 6; i++) {
			if (MSG.chaddr[i] != Mac[i]) return(0);
		}
		
		//DHCP Server IP
		for(i = 0; i < 4; i++) {
			DHCPS_IP[i] = MSG.siaddr[i];
		}
		
		for (i = 0; i < 4; i++)
		{
			IpAddr[i] = MSG.yiaddr[i];
			/*
			#ifdef DHCP_DEBUG
				PutHTOA(MSG.yiaddr[i]);
				PutByte(':');
			#endif
			*/
		}
		/*
		#ifdef DHCP_DEBUG
			PutStringLn("");
		#endif
		*/
	}
	type = 0;
	p = (UCHAR xdata*)(&MSG.op);
	p = p + 240;
	e = p + (len - 240);

	while ( p < e )
	{

		switch ( *p ) 
		{
			case endOption :
				goto PARSE_END;
				break;
       		case padOption :
				p++;
				break;
     		case dhcpMessageType :
				p++;
				p++;
				type = *p++;
				/*
				#ifdef DHCP_DEBUG
	                PutString("dhcpMessageType : ");
					PutHTOA(type);
					PutStringLn("");
				#endif
				*/
				break;
       		case subnetMask :
				p++;
				p++;
				for (i = 0; i < 4; i++)	SubMask[i] = *p++;
				/*
				#ifdef DHCP_DEBUG
					PutString("subnetMask : ");
					for (i = 0; i < 4; i++)
					{
						PutHTOA(SubMask[i]);
						PutByte(':');
					}
					PutStringLn("");
				#endif
				*/
				break;
       		case routersOnSubnet :
				p++;
				p++;
				for (i = 0; i < 4; i++)	Gateway[i] = *p++;
				/*
				#ifdef DHCP_DEBUG
					PutString("routersOnSubnet : ");
					for (i = 0; i < 4; i++) 
					{
						PutHTOA(Gateway[i]);
						PutByte(':');
					}
					PutStringLn("");
				#endif
				*/
				break;
	       	case dns :
				p++;
				p++;
				for (i = 0; i < 4; i++)	DNS[i] = *p++;
				/*
				#ifdef DHCP_DEBUG
					PutString("dns : ");
					for (i = 0; i < 4; i++) 
					{
						PutHTOA(DNS[i]);
						PutByte(':');
					}
					PutStringLn("");
				#endif
				*/
				break;
		case dhcpIPaddrLeaseTime :
			p++;
			opt_len = *p++;
			lease_time.cVal[0] = *p++;
			lease_time.cVal[1] = *p++;
			lease_time.cVal[2] = *p++;
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💿 文件大小 37 K
👤 上传用户 Lxb500
📂 所属分类单片机开发
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#TCIP #MCS #51 #单片机
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