mips/src/common/network/dhcp.c

// -------------------------------------------------------------------------
// ethernet.c
//
//  21.12.2003, J. Ahrensfeld
//
// -------------------------------------------------------------------------
#include <string.h>
#include <time.h>
#include <libsys/libsys.h>
#include "ethernet.h"
#include "ipv4.h"
#include "udp.h"
#include "dhcp.h"

#define WITH_CLIENT_ID	1
const char hostname[] = "ml402";

// -------------------------------------------------------------------------
// Testing
void DHCP_request_send(packet_t *pPacket, uint32_t dhcp_msg_type, uint8_t *mac_addr_src, uint8_t *inet_addr_src, uint8_t *inet_addr_dst, DHCP *pLast)
{
	DHCP dhcp;
	dhcp_opt_hdr_t *pOpt_hdr;
	uint32_t size;
	uint32_t magic = DHCP_MAGIC_COOKIE;
	uint32_t option_size;
	
	DHCP *pDHCP = &dhcp;

	memset(pDHCP, 0, sizeof(DHCP));

	pDHCP->op = DHCP_BOOTREQUEST;
	pDHCP->htype = TYPE_HW_ETH10;
	pDHCP->hlen = 6;
	pDHCP->hops = 0;
	pDHCP->secs = clock()/CLOCKS_PER_SEC;
	pDHCP->flags = DHCP_FLAGS_BROADCAST;
	memcpy(pDHCP->chaddr, mac_addr_src, pDHCP->hlen);

	switch(dhcp_msg_type)
	{
		case DHCP_MSG_DHCPDISCOVER:

		pDHCP->xid = (uint32_t)rand();

		// Options
		option_size = 0;

		size = sizeof(magic);
		memcpy(&pDHCP->options[option_size], &magic, size);
		option_size += size;

		// Set msg type
		size = sizeof(dhcp_opt_hdr_t);
		pOpt_hdr = (dhcp_opt_hdr_t*)&pDHCP->options[option_size];
		pOpt_hdr->code = DHCP_OPT_MSGTYPE;
		pOpt_hdr->len = 1;
		option_size += size;

		size = pOpt_hdr->len;
		pDHCP->options[option_size] = dhcp_msg_type;
		option_size += size;

#ifdef WITH_CLIENT_ID
		// Set client ID
		size = sizeof(dhcp_opt_hdr_t);
		pOpt_hdr = (dhcp_opt_hdr_t*)&pDHCP->options[option_size];
		pOpt_hdr->code = DHCP_OPT_CLIENTID;
		pOpt_hdr->len = 7;
		option_size += size;

		size = 1;
		pDHCP->options[option_size] = TYPE_HW_ETH10;
		option_size += size;
		
		size = 6;
		memcpy(&pDHCP->options[option_size], mac_addr_src, size);
		option_size += size;
#endif
		
		// Set client name
		size = sizeof(dhcp_opt_hdr_t);
		pOpt_hdr = (dhcp_opt_hdr_t*)&pDHCP->options[option_size];
		pOpt_hdr->code = DHCP_OPT_HOSTNAME;
		pOpt_hdr->len = strlen(hostname);
		option_size += size;

		size = pOpt_hdr->len;
		memcpy(&pDHCP->options[option_size], hostname, size);
		option_size += size;

		pDHCP->options[option_size] = DHCP_OPT_END;
		option_size++;
		
		break;

		case DHCP_MSG_DHCPREQUEST:

		pDHCP->xid = pLast->xid;

		// Options
		option_size = 0;

		size = sizeof(magic);
		memcpy(&pDHCP->options[option_size], &magic, size);
		option_size += size;

		// Set msg type
		size = sizeof(dhcp_opt_hdr_t);
		pOpt_hdr = (dhcp_opt_hdr_t*)&pDHCP->options[option_size];
		pOpt_hdr->code = DHCP_OPT_MSGTYPE;
		pOpt_hdr->len = 1;
		option_size += size;

		size = pOpt_hdr->len;
		pDHCP->options[option_size] = dhcp_msg_type;
		option_size += size;

#ifdef WITH_CLIENT_ID
		// Set client ID
		size = sizeof(dhcp_opt_hdr_t);
		pOpt_hdr = (dhcp_opt_hdr_t*)&pDHCP->options[option_size];
		pOpt_hdr->code = DHCP_OPT_CLIENTID;
		pOpt_hdr->len = 7;
		option_size += size;

		size = 1;
		pDHCP->options[option_size] = TYPE_HW_ETH10;
		option_size += size;
		
		size = 6;
		memcpy(&pDHCP->options[option_size], mac_addr_src, size);
		option_size += size;
#endif
		// Set client name
		size = sizeof(dhcp_opt_hdr_t);
		pOpt_hdr = (dhcp_opt_hdr_t*)&pDHCP->options[option_size];
		pOpt_hdr->code = DHCP_OPT_HOSTNAME;
		pOpt_hdr->len = strlen(hostname);
		option_size += size;

		size = pOpt_hdr->len;
		memcpy(&pDHCP->options[option_size], hostname, size);
		option_size += size;

		// Set requested IP address
		size = sizeof(dhcp_opt_hdr_t);
		pOpt_hdr = (dhcp_opt_hdr_t*)&pDHCP->options[option_size];
		pOpt_hdr->code = DHCP_OPT_REQIP;
		pOpt_hdr->len = 4;
		option_size += size;

		size = pOpt_hdr->len;
		memcpy(&pDHCP->options[option_size], pLast->yiaddr, size);
		option_size += size;

		pDHCP->options[option_size] = DHCP_OPT_END;
		option_size++;
		break;

		default:
		break;
	}
	UDP_create(pPacket, inet_addr_src, 68, inet_addr_dst, 67, (uint8_t*)&dhcp, sizeof(DHCP));
}