busybox/networking/udhcp/static_leases.c

/* vi: set sw=4 ts=4: */
/*
 * static_leases.c -- Couple of functions to assist with storing and
 * retrieving data for static leases
 *
 * Wade Berrier <wberrier@myrealbox.com> September 2004
 *
 * Licensed under GPLv2, see file LICENSE in this tarball for details.
 */

#include "common.h"
#include "dhcpd.h"


/* Takes the address of the pointer to the static_leases linked list,
 *   Address to a 6 byte mac address
 *   Address to a 4 byte ip address */
void FAST_FUNC addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t ip)
{
	struct static_lease *new_static_lease;

	/* Build new node */
	new_static_lease = xzalloc(sizeof(struct static_lease));
	memcpy(new_static_lease->mac, mac, 6);
	new_static_lease->ip = ip;
	/*new_static_lease->next = NULL;*/

	/* If it's the first node to be added... */
	if (*lease_struct == NULL) {
		*lease_struct = new_static_lease;
	} else {
		struct static_lease *cur = *lease_struct;
		while (cur->next)
			cur = cur->next;
		cur->next = new_static_lease;
	}
}

/* Check to see if a mac has an associated static lease */
uint32_t FAST_FUNC getIpByMac(struct static_lease *lease_struct, void *mac)
{
	while (lease_struct) {
		if (memcmp(lease_struct->mac, mac, 6) == 0)
			return lease_struct->ip;
		lease_struct = lease_struct->next;
	}

	return 0;
}

/* Check to see if an ip is reserved as a static ip */
int FAST_FUNC reservedIp(struct static_lease *lease_struct, uint32_t ip)
{
	while (lease_struct) {
		if (lease_struct->ip == ip)
			return 1;
		lease_struct = lease_struct->next;
	}

	return 0;
}

#if ENABLE_UDHCP_DEBUG
/* Print out static leases just to check what's going on */
/* Takes the address of the pointer to the static_leases linked list */
void FAST_FUNC printStaticLeases(struct static_lease **arg)
{
	struct static_lease *cur = *arg;

	while (cur) {
		printf("PrintStaticLeases: Lease mac Value: %02x:%02x:%02x:%02x:%02x:%02x\n",
			cur->mac[0], cur->mac[1], cur->mac[2],
			cur->mac[3], cur->mac[4], cur->mac[5]
		);
		printf("PrintStaticLeases: Lease ip Value: %x\n", cur->ip);
		cur = cur->next;
	}
}
#endif