source: MondoRescue/branches/3.3/mindi-busybox/networking/udhcp/static_leases.c@ 3803

/* vi: set sw=4 ts=4: */
/*
 * Storing and retrieving data for static leases
 *
 * Wade Berrier <wberrier@myrealbox.com> September 2004
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */
#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,
 * 4 byte IP address */
void FAST_FUNC add_static_lease(struct static_lease **st_lease_pp,
        uint8_t *mac,
        uint32_t nip)
{
    struct static_lease *st_lease;

    /* Find the tail of the list */
    while ((st_lease = *st_lease_pp) != NULL) {
        st_lease_pp = &st_lease->next;
    }

    /* Add new node */
    *st_lease_pp = st_lease = xzalloc(sizeof(*st_lease));
    memcpy(st_lease->mac, mac, 6);
    st_lease->nip = nip;
    /*st_lease->next = NULL;*/
}

/* Find static lease IP by mac */
uint32_t FAST_FUNC get_static_nip_by_mac(struct static_lease *st_lease, void *mac)
{
    while (st_lease) {
        if (memcmp(st_lease->mac, mac, 6) == 0)
            return st_lease->nip;
        st_lease = st_lease->next;
    }

    return 0;
}

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

    return 0;
}

#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
/* 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 log_static_leases(struct static_lease **st_lease_pp)
{
    struct static_lease *cur;

    if (dhcp_verbose < 2)
        return;

    cur = *st_lease_pp;
    while (cur) {
        bb_error_msg("static lease: mac:%02x:%02x:%02x:%02x:%02x:%02x nip:%x",
            cur->mac[0], cur->mac[1], cur->mac[2],
            cur->mac[3], cur->mac[4], cur->mac[5],
            cur->nip
        );
        cur = cur->next;
    }
}
#endif