/*
* Copyright (c) 2001,2002 Sebastien Petit <spe@bsdfr.org>
*
* Redistribution and use in source forms, with and without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution. Obviously, it
* would be nice if you gave credit where credit is due but requiring it
* would be too onerous.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Sebastien Petit.
* 4. Neither the name of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: vrrp_list.c,v 1.1.1.1 2017/06/14 12:01:54 misho Exp $
*/
#include <errno.h>
#include "vrrp_list.h"
/*
* We use a double chained list with sentinels --- --- |f|->|d|->NULL
* NULL<-| |<-| | --- ---
*/
/*
* Initialise la liste chainee avec un premier element: l'adresse reelle du
* VRID
*/
char
vrrp_list_initialize(struct vrrp_vr * vr, struct ether_addr * ethaddr)
{
vr->vr_if->p = (struct vrrp_ethaddr_list *) malloc(sizeof(*(vr->vr_if->p)));
vr->vr_if->d = (struct vrrp_ethaddr_list *) malloc(sizeof(*(vr->vr_if->d)));
if (!vr->vr_if->p || !vr->vr_if->d) {
syslog(LOG_ERR, "Can't allocate memory for vrrp_list_initialize: %s", strerror(errno));
return -1;
}
bzero(vr->vr_if->p, sizeof(*vr->vr_if->p));
bzero(vr->vr_if->d, sizeof(*vr->vr_if->d));
vr->vr_if->p->previous = NULL;
vr->vr_if->p->next = vr->vr_if->d;
vr->vr_if->d->previous = vr->vr_if->p;
vr->vr_if->d->next = NULL;
if (vrrp_list_add(vr, ethaddr) == -1) {
free(vr->vr_if->p);
free(vr->vr_if->d);
return -1;
}
return 0;
}
/*
* Ajoute un nouvel element dans la liste
*/
char
vrrp_list_add(struct vrrp_vr * vr, struct ether_addr *ethaddr)
{
struct vrrp_ethaddr_list *n;
if (!(n = (struct vrrp_ethaddr_list *) malloc(sizeof(*n)))) {
syslog(LOG_ERR, "Can't allocate memory for vrrp_list_add: %s", strerror(errno));
return -1;
}
bzero(n, sizeof(*n));
bcopy(ethaddr, &n->ethaddr, sizeof(struct ether_addr));
n->previous = vr->vr_if->d->previous;
n->next = vr->vr_if->d;
vr->vr_if->d->previous->next = n;
vr->vr_if->d->previous = n;
return 0;
}
/*
* Enleve un element de la liste
*/
char
vrrp_list_delete(struct vrrp_vr * vr, struct ether_addr ethaddr)
{
struct vrrp_ethaddr_list *e = vr->vr_if->p;
while (e->next && bcmp(ðaddr, &e->ethaddr, sizeof(ethaddr)))
e = e->next;
if (!e->next)
return -1;
e->next->previous = e->previous;
e->previous->next = e->next;
free(e);
return 0;
}
struct ether_addr
vrrp_list_get_first(struct vrrp_vr * vr)
{
return vr->vr_if->p->next->ethaddr;
}
/*
* Renvoie l'adresse MAC du dernier element
*/
struct ether_addr
vrrp_list_get_last(struct vrrp_vr * vr)
{
return vr->vr_if->d->previous->ethaddr;
}
void
vrrp_list_destroy(struct vrrp_vr * vr)
{
vr->vr_if->d = vr->vr_if->d->previous;
while (vr->vr_if->d != vr->vr_if->p) {
free(vr->vr_if->d->next);
vr->vr_if->d = vr->vr_if->d->previous;
}
free(vr->vr_if->d);
free(vr->vr_if->p);
return;
}
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