source: MondoRescue/trunk/mindi-busybox/networking/udhcp/static_leases.c@ 904

/*
 * static_leases.c -- Couple of functions to assist with storing and
 * retrieving data for static leases
 *
 * Wade Berrier <wberrier@myrealbox.com> September 2004
 *
 */


#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "static_leases.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 */
int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip)
{

    struct static_lease *cur;
    struct static_lease *new_static_lease;

    /* Build new node */
    new_static_lease = xmalloc(sizeof(struct static_lease));
    new_static_lease->mac = mac;
    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
    {
        cur = *lease_struct;
        while(cur->next != NULL)
        {
            cur = cur->next;
        }

        cur->next = new_static_lease;
    }

    return 1;

}

/* Check to see if a mac has an associated static lease */
uint32_t getIpByMac(struct static_lease *lease_struct, void *arg)
{
    uint32_t return_ip;
    struct static_lease *cur = lease_struct;
    uint8_t *mac = arg;

    return_ip = 0;

    while(cur != NULL)
    {
        /* If the client has the correct mac  */
        if(memcmp(cur->mac, mac, 6) == 0)
        {
            return_ip = *(cur->ip);
        }

        cur = cur->next;
    }

    return return_ip;

}

/* Check to see if an ip is reserved as a static ip */
uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip)
{
    struct static_lease *cur = lease_struct;

    uint32_t return_val = 0;

    while(cur != NULL)
    {
        /* If the client has the correct ip  */
        if(*cur->ip == ip)
            return_val = 1;

        cur = cur->next;
    }

    return return_val;

}

#ifdef CONFIG_FEATURE_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 printStaticLeases(struct static_lease **arg)
{
    /* Get a pointer to the linked list */
    struct static_lease *cur = *arg;

    while(cur != NULL)
    {
        /* printf("PrintStaticLeases: Lease mac Address: %x\n", cur->mac); */
        printf("PrintStaticLeases: Lease mac Value: %x\n", *(cur->mac));
        /* printf("PrintStaticLeases: Lease ip Address: %x\n", cur->ip); */
        printf("PrintStaticLeases: Lease ip Value: %x\n", *(cur->ip));

        cur = cur->next;
    }


}
#endif