tinydhcp.c

ADAM2 sources (modified by Oleg)

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/*-----------------------------------------------------------------------------*/

#include "tinyip.h"
#include "env.h"
#include "main.h"

#define DHCP_TIMEOUT			5
#define INIT					1
#define REQUEST					2
#define BOUND					3
#define RENEW					4
#define DHCP_RETRANSMISSIONS 	2

static int rand_xid;
static int s_xid;

static unsigned long server_addr;
static unsigned long router_addr;
static unsigned long subnet_addr;
static unsigned long requested_ip;

unsigned long random_xid(void);
void send_discover(void);
void send_selecting(void);
void send_renew(void);

int dhcpclient(void)
{
	static int state;
	static unsigned long lease;
	dhcpMessage rxpacket;
	unsigned char *temp, *message;
	char cp[20];
	unsigned long dhcp_timeout, ticks;
	int ret, ack_received = 0;
	int packetnums, dhcpflag;
	unsigned int rcv_ipaddress;

	sin_lclINAddr = 0;
	sys_unsetenv("my_ipaddress");
	sys_unsetenv("gateway");
	sys_unsetenv("ipmask");
	
	if (!udplib_init(sin_lclINAddr)) {
		/*sys_printf("udplib_init: failed\n");*/
		return 0;
	}

	if (!udplib_open(CLIENT_PORT, SERVER_PORT, NULL))	{
		/*sys_printf("udplib_open: failed\n");*/
		return 0;
	}

	ticks = 0;
	state = INIT;
	packetnums = 0;
	dhcpflag = 1;
	s_xid = rand_xid = 0;

	server_addr = requested_ip = 0x0;
	router_addr = subnet_addr = 0x0;

	while (dhcpflag)
	{
		t_clear();
		dhcp_timeout = t_get() + ticks;
		
		ret = udp_receive(&rcv_ipaddress, &rxpacket, sizeof(dhcpMessage), TRUE);
   	
		while ( (ret == 0) && (t_get() < dhcp_timeout) ) {
			ret = udp_receive(&rcv_ipaddress, &rxpacket, sizeof(dhcpMessage), TRUE);
		}

		if (ret == 0) {
			switch (state)
			{
				case INIT :
					if (packetnums < DHCP_RETRANSMISSIONS) {
						send_discover();
						ticks = GetTicks(DHCP_TIMEOUT);
						packetnums++;
					}
					else
						dhcpflag = 0;
					break;
				
				case REQUEST :
					if (packetnums < DHCP_RETRANSMISSIONS) {
						send_selecting();
						ticks = GetTicks(DHCP_TIMEOUT);
						packetnums++;
					}
					else
						dhcpflag = 0;
					break;

			#ifdef DHCP_RENEW
				case BOUND :
					state = RENEW;
					ticks = GetTicks((DHCP_TIMEOUT - 4));
					break;

				case RENEW :
				{
					unsigned long templease;
					templease = GetSecs(ticks);	
					if (templease < lease)
					{
						send_renew();
						ticks = GetTicks(lease);
					}
					else
					{
						/*sys_printf("Lease lost, entering init state.\n");*/
						requested_ip = 0;
						state = INIT;
						ticks = GetTicks((DHCP_TIMEOUT - 4));
					}
				}
				break;
			#endif /* DHCP_RENEW */