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/*
 *	Based on LiMon - BOOTP.
 *
 *	Copyright 1994, 1995, 2000 Neil Russell.
 *	(See License)
 *	Copyright 2000 Roland Borde
 *	Copyright 2000 Paolo Scaffardi
 */
 
#if 1
#define	DEBUG		1	/* general debug */
#define DEBUG_BOOTP_EXT	1	/* Debug received vendor fields */
#endif
 
#ifdef DEBUG_BOOTP_EXT
#define debug_ext(fmt,args...)	printf (fmt ,##args)
#else
#define debug_ext(fmt,args...)
#endif
 
#include "common.h"
#include "net.h"
#include "bootp.h"
#include "tftp.h"
#include "arp.h"
 
#define	BOOTP_VENDOR_MAGIC	0x63825363	/* RFC1048 Magic Cookie         */
 
#if (CONFIG_COMMANDS & CFG_CMD_NET)
 
#define TIMEOUT		5	/* Seconds before trying BOOTP again    */
#define TIMEOUT_COUNT	1	/* # of timeouts before giving up       */
 
#define PORT_BOOTPS	67	/* BOOTP server UDP port                */
#define PORT_BOOTPC	68	/* BOOTP client UDP port                */
 
#ifndef CONFIG_DHCP_MIN_EXT_LEN	/* minimal length of extension list     */
#define	CONFIG_DHCP_MIN_EXT_LEN	64
#endif
 
ulong BootpID;
int BootpTry;
#ifdef CONFIG_BOOTP_RANDOM_DELAY
ulong seed1, seed2;
#endif
 
#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
dhcp_state_t dhcp_state = INIT;
unsigned int dhcp_leasetime = 0;
static void DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len);
 
/* For Debug */
char *dhcpmsg2str(int type)
{
	switch (type) {
	case 1:
		return "DHCPDISCOVER";
		break;
	case 2:
		return "DHCPOFFER";
		break;
	case 3:
		return "DHCPREQUEST";
		break;
	case 4:
		return "DHCPDECLINE";
		break;
	case 5:
		return "DHCPACK";
		break;
	case 6:
		return "DHCPNACK";
		break;
	case 7:
		return "DHCPRELEASE";
		break;
	default:
		return "UNKNOWN/INVALID MSG TYPE";
		break;
	}
}
 
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
extern u8 *dhcp_vendorex_prep(u8 * e);	/*rtn new e after add own opts. */
extern u8 *dhcp_vendorex_proc(u8 * e);	/*rtn next e if mine,else NULL  */
#endif
 
#endif /* CFG_CMD_DHCP */
 
static int BootpCheckPkt(uchar * pkt, unsigned dest, unsigned src, unsigned len)
{
	Bootp_t *bp = (Bootp_t *) pkt;
	int retval = 0;
 
	if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
		retval = -1;
	if (len < sizeof(Bootp_t) - OPT_SIZE)
		retval = -2;
	if (bp->bp_op != OP_BOOTREQUEST &&
	    bp->bp_op != OP_BOOTREPLY &&
	    bp->bp_op != DHCP_OFFER &&
	    bp->bp_op != DHCP_ACK && bp->bp_op != DHCP_NAK) {
		retval = -3;
	}
	if (bp->bp_htype != HWT_ETHER)
		retval = -4;
	if (bp->bp_hlen != HWL_ETHER)
		retval = -5;
	if (bp->bp_id != BootpID)
		retval = -6;
 
	debug("Filtering pkt = %d\n", retval);
 
	return retval;
}
 
/*
 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 */
void BootpCopyNetParams(Bootp_t * bp)
{
	NetOurIP = bp->bp_yiaddr;
	NetServerIP = bp->bp_siaddr;
	NetCopyEther(NetServerEther, ((Ethernet_t *) NetRxPkt)->et_src);
	copy_filename(BootFile, bp->bp_file, sizeof(BootFile));
 
	debug("Bootfile: %s\n", BootFile);
 
	/* Propagate to environment:
	 * don't delete exising entry when BOOTP / DHCP reply does
	 * not contain a new value
	 */
	if (*BootFile) {
		setenv("bootfile", BootFile);
	}
}
 
static int truncate_sz(const char *name, int maxlen, int curlen)
{
	if (curlen >= maxlen) {
		printf
		    ("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
		     name, curlen, maxlen);
		curlen = maxlen - 1;
	}
	return (curlen);
}
 
#if !(CONFIG_COMMANDS & CFG_CMD_DHCP)
 
static void BootpVendorFieldProcess(u8 * ext)
{
	int size = *(ext + 1);
 
	debug_ext("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
		  *(ext + 1));
 
	NetBootFileSize = 0;
 
	switch (*ext) {
		/* Fixed length fields */
	case 1:		/* Subnet mask                                  */
		if (NetOurSubnetMask == 0)
			memcpy(&NetOurSubnetMask, ext + 2, 4);
		break;
	case 2:		/* Time offset - Not yet supported              */
		break;
		/* Variable length fields */
	case 3:		/* Gateways list                                */
		if (NetOurGatewayIP == 0) {
			memcpy(&NetOurGatewayIP, ext + 2, 4);
		}
		break;
	case 4:		/* Time server - Not yet supported              */
		break;
	case 5:		/* IEN-116 name server - Not yet supported      */
		break;
	case 6:
		if (NetOurDNSIP == 0) {
			memcpy(&NetOurDNSIP, ext + 2, 4);
		}
		break;
	case 7:		/* Log server - Not yet supported               */
		break;
	case 8:		/* Cookie/Quote server - Not yet supported      */
		break;
	case 9:		/* LPR server - Not yet supported               */
		break;
	case 10:		/* Impress server - Not yet supported           */
		break;
	case 11:		/* RPL server - Not yet supported               */
		break;
	case 12:		/* Host name                                    */
		if (NetOurHostName[0] == 0) {
			size =
			    truncate_sz("Host Name", sizeof(NetOurHostName),
					size);
			memcpy(&NetOurHostName, ext + 2, size);
			NetOurHostName[size] = 0;
		}
		break;
	case 13:		/* Boot file size                               */
		memcpy(&NetBootFileSize, ext + 2, size);
		break;
	case 14:		/* Merit dump file - Not yet supported          */
		break;
	case 15:		/* Domain name - Not yet supported              */
		break;
	case 16:		/* Swap server - Not yet supported              */
		break;
	case 17:		/* Root path                                    */
		if (NetOurRootPath[0] == 0) {
			size =
			    truncate_sz("Root Path", sizeof(NetOurRootPath),
					size);
			memcpy(&NetOurRootPath, ext + 2, size);
			NetOurRootPath[size] = 0;
		}
		break;
	case 18:		/* Extension path - Not yet supported           */
		/*
		 * This can be used to send the informations of the
		 * vendor area in another file that the client can
		 * access via TFTP.
		 */
		break;
		/* IP host layer fields */
	case 40:		/* NIS Domain name                              */
		if (NetOurNISDomain[0] == 0) {
			size = truncate_sz("NIS Domain Name",
					   sizeof(NetOurNISDomain), size);
			memcpy(&NetOurNISDomain, ext + 2, size);
			NetOurNISDomain[size] = 0;
		}
		break;
		/* Application layer fields */
	case 43:		/* Vendor specific info - Not yet supported     */
		/*
		 * Binary informations to exchange specific
		 * product information.
		 */
		break;
		/* Reserved (custom) fields (128..254) */
	}
}
 
static void BootpVendorProcess(u8 * ext, int size)
{
	u8 *end = ext + size;
 
	debug_ext("[BOOTP] Checking extension (%d bytes)...\n", size);
 
	while ((ext < end) && (*ext != 0xff)) {
		if (*ext == 0) {
			ext++;
		} else {
			u8 *opt = ext;
			ext += ext[1] + 2;
			if (ext <= end)
				BootpVendorFieldProcess(opt);
		}
	}
 
#ifdef DEBUG_BOOTP_EXT
	printf("[BOOTP] Received fields: \n");
	if (NetOurSubnetMask) {
		puts("NetOurSubnetMask	: ");
		print_IPaddr(NetOurSubnetMask);
		putc('\n');
	}
 
	if (NetOurGatewayIP) {
		puts("NetOurGatewayIP	: ");
		print_IPaddr(NetOurGatewayIP);
		putc('\n');
	}
 
	if (NetBootFileSize) {
		printf("NetBootFileSize : %d\n", NetBootFileSize);
	}
 
	if (NetOurHostName[0]) {
		printf("NetOurHostName  : %s\n", NetOurHostName);
	}
 
	if (NetOurRootPath[0]) {
		printf("NetOurRootPath  : %s\n", NetOurRootPath);
	}
 
	if (NetOurNISDomain[0]) {
		printf("NetOurNISDomain : %s\n", NetOurNISDomain);
	}
#endif /* DEBUG_BOOTP_EXT */
}
 
/*
 *	Handle a BOOTP received packet.
 */
static void BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
{
	Bootp_t *bp;
	char *s;
 
	debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%d)\n",
	      src, dest, len, sizeof(Bootp_t));
 
	bp = (Bootp_t *) pkt;
 
	if (BootpCheckPkt(pkt, dest, src, len))	/* Filter out pkts we don't want */
		return;
 
	/*
	 *      Got a good BOOTP reply.  Copy the data into our variables.
	 */
#ifdef CONFIG_STATUS_LED
	status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
#endif
 
	BootpCopyNetParams(bp);	/* Store net parameters from reply */
 
	/* Retrieve extended informations (we must parse the vendor area) */
	if ((*(uint *) bp->bp_vend) == BOOTP_VENDOR_MAGIC)
		BootpVendorProcess(&bp->bp_vend[4], len);
 
	NetSetTimeout(0, (thand_f *) 0);
 
	debug("Got good BOOTP\n");
 
	if (((s = getenv("autoload")) != NULL) && (*s == 'n')) {
		/*
		 * Just use BOOTP to configure system;
		 * Do not use TFTP to load the bootfile.
		 */
		NetState = NETLOOP_SUCCESS;
		return;
	}
 
	/* Send ARP request to get TFTP server ethernet address.
	 * This automagically starts TFTP, too.
	 */
	ArpRequest();
}
#endif /* !CFG_CMD_DHCP */
 
/*
 *	Timeout on BOOTP/DHCP request.
 */
static void BootpTimeout(void)
{
	if (BootpTry >= TIMEOUT_COUNT) {
		puts("\nRetry count exceeded; starting again\n");
		NetStartAgain();
	} else {
		NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout);
		BootpRequest();
	}
}
 
/*
 *	Initialize BOOTP extension fields in the request.
 */
#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
static int DhcpExtended(u8 * e, int message_type, IPaddr_t ServerID,
			IPaddr_t RequestedIP)
{
	u8 *start = e;
	u8 *cnt;
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
	u8 *x;
#endif
 
	*e++ = 99;		/* RFC1048 Magic Cookie */
	*e++ = 130;
	*e++ = 83;
	*e++ = 99;
 
	*e++ = 53;		/* DHCP Message Type */
	*e++ = 1;
	*e++ = message_type;
 
	*e++ = 57;		/* Maximum DHCP Message Size */
	*e++ = 2;
	*e++ = (576 - 312 + OPT_SIZE) >> 8;
	*e++ = (576 - 312 + OPT_SIZE) & 0xff;
 
	if (ServerID) {
		*e++ = 54;	/* ServerID */
		*e++ = 4;
		*e++ = ServerID >> 24;
		*e++ = ServerID >> 16;
		*e++ = ServerID >> 8;
		*e++ = ServerID & 0xff;
	}
 
	if (RequestedIP) {
		*e++ = 50;	/* Requested IP */
		*e++ = 4;
		*e++ = RequestedIP >> 24;
		*e++ = RequestedIP >> 16;
		*e++ = RequestedIP >> 8;
		*e++ = RequestedIP & 0xff;
	}
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
	if ((x = dhcp_vendorex_prep(e)))
		return x - start;
#endif
 
	*e++ = 55;		/* Parameter Request List */
	cnt = e++;		/* Pointer to count of requested items */
	*cnt = 0;
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
	*e++ = 1;		/* Subnet Mask */
	*cnt += 1;
#endif
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
	*e++ = 3;		/* Router Option */
	*cnt += 1;
#endif
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
	*e++ = 6;		/* DNS Server(s) */
	*cnt += 1;
#endif
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
	*e++ = 12;		/* Hostname */
	*cnt += 1;
#endif
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
	*e++ = 13;		/* Boot File Size */
	*cnt += 1;
#endif
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
	*e++ = 17;		/* Boot path */
	*cnt += 1;
#endif
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
	*e++ = 40;		/* NIS Domain name request */
	*cnt += 1;
#endif
	*e++ = 255;		/* End of the list */
 
	/* Pad to minimal length */
#ifdef	CONFIG_DHCP_MIN_EXT_LEN
	while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN)
		*e++ = 0;
#endif
 
	return e - start;
}
 
#else /* CFG_CMD_DHCP */
/*
 *	Warning: no field size check - change CONFIG_BOOTP_MASK at your own risk!
 */
static int BootpExtended(u8 * e)
{
	u8 *start = e;
 
	*e++ = 99;		/* RFC1048 Magic Cookie */
	*e++ = 130;
	*e++ = 83;
	*e++ = 99;
 
#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
	*e++ = 53;		/* DHCP Message Type */
	*e++ = 1;
	*e++ = DHCP_DISCOVER;
 
	*e++ = 57;		/* Maximum DHCP Message Size */
	*e++ = 2;
	*e++ = (576 - 312 + OPT_SIZE) >> 16;
	*e++ = (576 - 312 + OPT_SIZE) & 0xff;
#endif /* CFG_CMD_DHCP */
 
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
	*e++ = 1;		/* Subnet mask request */
	*e++ = 4;
	e += 4;
#endif
 
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
	*e++ = 3;		/* Default gateway request */
	*e++ = 4;
	e += 4;
#endif
 
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
	*e++ = 6;		/* Domain Name Server */
	*e++ = 4;
	e += 4;
#endif
 
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
	*e++ = 12;		/* Host name request */
	*e++ = 32;
	e += 32;
#endif
 
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
	*e++ = 13;		/* Boot file size */
	*e++ = 2;
	e += 2;
#endif
 
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
	*e++ = 17;		/* Boot path */
	*e++ = 32;
	e += 32;
#endif
 
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
	*e++ = 40;		/* NIS Domain name request */
	*e++ = 32;
	e += 32;
#endif
 
	*e++ = 255;		/* End of the list */
 
	return e - start;
}
#endif /* CFG_CMD_DHCP */
 
void BootpRequest(void)
{
	volatile uchar *pkt, *iphdr;
	Bootp_t *bp;
	int ext_len, pktlen, iplen;
 
#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
	dhcp_state = INIT;
#endif
 
#ifdef CONFIG_BOOTP_RANDOM_DELAY	/* Random BOOTP delay */
	unsigned char bi_enetaddr[6];
	int reg;
	char *e, *s;
	uchar tmp[64];
	ulong tst1, tst2, sum, m_mask, m_value = 0;
 
	if (BootpTry == 0) {
		/* get our mac */
		reg = getenv_r("ethaddr", tmp, sizeof(tmp));
		s = (reg > 0) ? tmp : NULL;
 
		for (reg = 0; reg < 6; ++reg) {
			bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0;
			if (s) {
				s = (*e) ? e + 1 : e;
			}
		}
#ifdef DEBUG
		printf("BootpRequest => Our Mac: ");
		for (reg = 0; reg < 6; reg++) {
			printf("%x%c", bi_enetaddr[reg], reg == 5 ? '\n' : ':');
		}
#endif /* DEBUG */
 
		/* Mac-Manipulation 2 get seed1 */
		tst1 = 0;
		tst2 = 0;
		for (reg = 2; reg < 6; reg++) {
			tst1 = tst1 << 8;
			tst1 = tst1 | bi_enetaddr[reg];
		}
		for (reg = 0; reg < 2; reg++) {
			tst2 = tst2 | bi_enetaddr[reg];
			tst2 = tst2 << 8;
		}
 
		seed1 = tst1 ^ tst2;
 
		/* Mirror seed1 */
		m_mask = 0x1;
		for (reg = 1; reg <= 32; reg++) {
			m_value |= (m_mask & seed1);
			seed1 = seed1 >> 1;
			m_value = m_value << 1;
		}
		seed1 = m_value;
		seed2 = 0xB78D0945;
	}
 
	/* Random Number Generator */
 
	for (reg = 0; reg <= 0; reg++) {
		sum = seed1 + seed2;
		if (sum < seed1 || sum < seed2)
			sum++;
		seed2 = seed1;
		seed1 = sum;
 
		if (BootpTry <= 2) {	/* Start with max 1024 * 1ms */
			sum = sum >> (22 - BootpTry);
		} else {	/*After 3rd BOOTP request max 8192 * 1ms */
			sum = sum >> 19;
		}
	}
 
	printf("Random delay: %ld ms...\n", sum);
	for (reg = 0; reg < sum; reg++) {
		udelay(1000);	/*Wait 1ms */
	}
#endif /* CONFIG_BOOTP_RANDOM_DELAY */
 
	printf("BOOTP broadcast %d\n", ++BootpTry);
	pkt = NetTxPacket;
	memset((void *)pkt, 0, PKTSIZE);
 
	NetSetEther(pkt, NetBcastAddr, PROT_IP);
	pkt += ETHER_HDR_SIZE;
 
	/*
	 * Next line results in incorrect packet size being transmitted, resulting
	 * in errors in some DHCP servers, reporting missing bytes.  Size must be
	 * set in packet header after extension length has been determined.
	 * C. Hallinan, DS4.COM, Inc.
	 */
	/* NetSetIP(pkt, 0xffffffffL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
	iphdr = pkt;		/* We need this later for NetSetIP() */
	pkt += IP_HDR_SIZE;
 
	bp = (Bootp_t *) pkt;
	bp->bp_op = OP_BOOTREQUEST;
	bp->bp_htype = HWT_ETHER;
	bp->bp_hlen = HWL_ETHER;
	bp->bp_hops = 0;
	bp->bp_secs = SWAP16(get_timer(0) / CFG_HZ);
	bp->bp_ciaddr = 0;
	bp->bp_yiaddr = 0;
	bp->bp_siaddr = 0;
	bp->bp_giaddr = 0;
	NetCopyEther(bp->bp_chaddr, NetOurEther);
	copy_filename(bp->bp_file, BootFile, sizeof(bp->bp_file));
 
	/* Request additional information from the BOOTP/DHCP server */
#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
	ext_len = DhcpExtended(bp->bp_vend, DHCP_DISCOVER, 0, 0);
#else
	ext_len = BootpExtended(bp->bp_vend);
#endif /* CFG_CMD_DHCP */
 
	/*
	 *      Bootp ID is the lower 4 bytes of our ethernet address
	 *      plus the current time in HZ.
	 */
	BootpID = ((ulong) NetOurEther[2] << 24)
	    | ((ulong) NetOurEther[3] << 16)
	    | ((ulong) NetOurEther[4] << 8)
	    | (ulong) NetOurEther[5];
	BootpID += get_timer(0);
	bp->bp_id = BootpID;
 
	/*
	 * Calculate proper packet lengths taking into account the
	 * variable size of the options field
	 */
	pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len;
	iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
	NetSetIP(iphdr, 0xffffffffL, PORT_BOOTPS, PORT_BOOTPC, iplen);
	NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout);
 
#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
	dhcp_state = SELECTING;
	NetSetHandler(DhcpHandler);
#else
	NetSetHandler(BootpHandler);
#endif /* CFG_CMD_DHCP */
	NetSendPacket(NetTxPacket, pktlen);
}
 
#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
void DhcpOptionsProcess(char *popt)
{
	char *end = popt + BOOTP_HDR_SIZE;
	int oplen, size;
 
	while (popt < end && *popt != 0xff) {
		oplen = *(popt + 1);
		switch (*popt) {
		case 1:
			NetOurSubnetMask = *(IPaddr_t *) (popt + 2);
			break;
		case 3:
			NetOurGatewayIP = *(IPaddr_t *) (popt + 2);
			break;
		case 6:
			NetOurDNSIP = *(IPaddr_t *) (popt + 2);
			break;
		case 12:
			size = truncate_sz("Host Name",
					   sizeof(NetOurHostName), oplen);
			memcpy(&NetOurHostName, popt + 2, size);
			NetOurHostName[size] = 0;
			break;
		case 15:	/* Ignore Domain Name Option */
			break;
		case 17:
			size = truncate_sz("Root Path",
					   sizeof(NetOurRootPath), oplen);
			memcpy(&NetOurRootPath, popt + 2, size);
			NetOurRootPath[size] = 0;
			break;
		case 51:
			dhcp_leasetime = *(unsigned int *)(popt + 2);
			break;
		case 53:	/* Ignore Message Type Option */
			break;
		case 54:
			NetServerIP = *(IPaddr_t *) (popt + 2);
			break;
		case 58:	/* Ignore Renewal Time Option */
			break;
		case 59:	/* Ignore Rebinding Time Option */
			break;
		default:
#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
			if (dhcp_vendorex_proc(popt))
				break;
#endif
			printf("*** Unhandled DHCP Option in OFFER/ACK: %d\n",
			       *popt);
			break;
		}
		popt += oplen + 2;	/* Process next option */
	}
}
 
static int DhcpMessageType(unsigned char *popt)
{
	if ((*(uint *) popt) != BOOTP_VENDOR_MAGIC)
		return -1;
 
	popt += 4;
	while (*popt != 0xff) {
		if (*popt == 53)	/* DHCP Message Type */
			return *(popt + 2);
		popt += *(popt + 1) + 2;	/* Scan through all options */
	}
	return -1;
}
 
void DhcpSendRequestPkt(Bootp_t * bp_offer)
{
	volatile uchar *pkt, *iphdr;
	Bootp_t *bp;
	int pktlen, iplen, extlen;
 
	debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
	pkt = NetTxPacket;
	memset((void *)pkt, 0, PKTSIZE);
 
	NetSetEther(pkt, NetBcastAddr, PROT_IP);
	pkt += ETHER_HDR_SIZE;
 
	iphdr = pkt;		/* We'll need this later to set proper pkt size */
	pkt += IP_HDR_SIZE;
 
	bp = (Bootp_t *) pkt;
	bp->bp_op = OP_BOOTREQUEST;
	bp->bp_htype = HWT_ETHER;
	bp->bp_hlen = HWL_ETHER;
	bp->bp_hops = 0;
	bp->bp_secs = SWAP16(get_timer(0) / CFG_HZ);
	bp->bp_ciaddr = bp_offer->bp_ciaddr;
	bp->bp_yiaddr = bp_offer->bp_yiaddr;
	bp->bp_siaddr = bp_offer->bp_siaddr;
	bp->bp_giaddr = bp_offer->bp_giaddr;
	NetCopyEther(bp->bp_chaddr, NetOurEther);
 
	/*
	 * ID is the id of the OFFER packet
	 */
 
	bp->bp_id = bp_offer->bp_id;
 
	/*
	 * Copy options from OFFER packet if present
	 */
	extlen =
	    DhcpExtended(bp->bp_vend, DHCP_REQUEST, NetServerIP, bp->bp_yiaddr);
 
	pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen;
	iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
	NetSetIP(iphdr, 0xffffffffL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 
	debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
	NetSendPacket(NetTxPacket, pktlen);
}
 
/*
 *	Handle DHCP received packets.
 */
static void DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
{
	Bootp_t *bp = (Bootp_t *) pkt;
 
	debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
	      src, dest, len, dhcp_state);
 
	if (BootpCheckPkt(pkt, dest, src, len))	/* Filter out pkts we don't want */
		return;
 
	debug
	    ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
	     src, dest, len, dhcp_state);
 
	switch (dhcp_state) {
	case SELECTING:
		/*
		 * Wait an appropriate time for any potential DHCPOFFER packets
		 * to arrive.  Then select one, and generate DHCPREQUEST response.
		 * If filename is in format we recognize, assume it is a valid
		 * OFFER from a server we want.
		 */
		debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
#ifdef CFG_BOOTFILE_PREFIX
		if (strncmp(bp->bp_file,
			    CFG_BOOTFILE_PREFIX,
			    strlen(CFG_BOOTFILE_PREFIX)) == 0) {
#endif /* CFG_BOOTFILE_PREFIX */
 
			debug("TRANSITIONING TO REQUESTING STATE\n");
			dhcp_state = REQUESTING;
#if 0
			if ((*(uint *) bp->bp_vend) == BOOTP_VENDOR_MAGIC)
				DhcpOptionsProcess(&bp->bp_vend[4]);
 
#endif
			BootpCopyNetParams(bp);	/* Store net params from reply */
 
			NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout);
			DhcpSendRequestPkt(bp);
#ifdef CFG_BOOTFILE_PREFIX
		}
#endif /* CFG_BOOTFILE_PREFIX */
 
		return;
		break;
	case REQUESTING:
		debug("DHCP State: REQUESTING\n");
 
		if (DhcpMessageType(bp->bp_vend) == DHCP_ACK) {
			char *s;
 
			if ((*(uint *) bp->bp_vend) == BOOTP_VENDOR_MAGIC)
				DhcpOptionsProcess(&bp->bp_vend[4]);
			BootpCopyNetParams(bp);	/* Store net params from reply */
			dhcp_state = BOUND;
			printf("DHCP client bound to address ");
			print_IPaddr(NetOurIP);
			printf("\n");
 
			/* Obey the 'autoload' setting */
			if (((s = getenv("autoload")) != NULL) && (*s == 'n')) {
				NetState = NETLOOP_SUCCESS;
				return;
			}
			/* Send ARP request to get TFTP server ethernet address.
			 * This automagically starts TFTP, too.
			 */
			ArpRequest();
			return;
		}
		break;
	default:
		printf("DHCP: INVALID STATE\n");
		break;
	}
 
}
 
void DhcpRequest(void)
{
	BootpRequest();
}
#endif /* CFG_CMD_DHCP */
 
#endif /* CFG_CMD_NET */