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Annotation of embedaddon/freevrrpd/vrrp_list.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (c) 2001,2002 Sebastien Petit <spe@bsdfr.org>
        !             3:  *
        !             4:  * Redistribution and use in source forms, with and without modification,
        !             5:  * are permitted provided that the following conditions are met:
        !             6:  * 1. Redistributions of source code must retain the above copyright notice,
        !             7:  *    this list of conditions and the following disclaimer.
        !             8:  * 2. Redistributions in binary form must reproduce the above copyright notice,
        !             9:  *    this list of conditions and the following disclaimer in the documentation
        !            10:  *    and/or other materials provided with the distribution. Obviously, it
        !            11:  *    would be nice if you gave credit where credit is due but requiring it
        !            12:  *    would be too onerous.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *      This product includes software developed by Sebastien Petit.
        !            16:  * 4. Neither the name of its contributors may be used to endorse or promote
        !            17:  *    products derived from this software without specific prior written
        !            18:  *    permission.
        !            19:  *
        !            20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            30:  * SUCH DAMAGE.
        !            31:  *
        !            32:  * $Id: vrrp_list.c,v 1.1.1.1 2004/02/15 12:55:26 spe Exp $
        !            33:  */
        !            34: 
        !            35: #include <errno.h>
        !            36: #include "vrrp_list.h"
        !            37: 
        !            38: /*
        !            39:  * We use a double chained list with sentinels ---  --- |f|->|d|->NULL
        !            40:  * NULL<-| |<-| | ---  ---
        !            41:  */
        !            42: 
        !            43: /*
        !            44:  * Initialise la liste chainee avec un premier element: l'adresse reelle du
        !            45:  * VRID
        !            46:  */
        !            47: char 
        !            48: vrrp_list_initialize(struct vrrp_vr * vr, struct ether_addr * ethaddr)
        !            49: {
        !            50:        vr->vr_if->p = (struct vrrp_ethaddr_list *) malloc(sizeof(*(vr->vr_if->p)));
        !            51:        vr->vr_if->d = (struct vrrp_ethaddr_list *) malloc(sizeof(*(vr->vr_if->d)));
        !            52:        if (!vr->vr_if->p || !vr->vr_if->d) {
        !            53:                syslog(LOG_ERR, "Can't allocate memory for vrrp_list_initialize: %s", strerror(errno));
        !            54:                return -1;
        !            55:        }
        !            56:        bzero(vr->vr_if->p, sizeof(*vr->vr_if->p));
        !            57:        bzero(vr->vr_if->d, sizeof(*vr->vr_if->d));
        !            58:        vr->vr_if->p->previous = NULL;
        !            59:        vr->vr_if->p->next = vr->vr_if->d;
        !            60:        vr->vr_if->d->previous = vr->vr_if->p;
        !            61:        vr->vr_if->d->next = NULL;
        !            62:        if (vrrp_list_add(vr, ethaddr) == -1) {
        !            63:                free(vr->vr_if->p);
        !            64:                free(vr->vr_if->d);
        !            65:                return -1;
        !            66:        }
        !            67:        return 0;
        !            68: }
        !            69: 
        !            70: /*
        !            71:  * Ajoute un nouvel element dans la liste
        !            72:  */
        !            73: char 
        !            74: vrrp_list_add(struct vrrp_vr * vr, struct ether_addr *ethaddr)
        !            75: {
        !            76:        struct vrrp_ethaddr_list *n;
        !            77: 
        !            78:        if (!(n = (struct vrrp_ethaddr_list *) malloc(sizeof(*n)))) {
        !            79:                syslog(LOG_ERR, "Can't allocate memory for vrrp_list_add: %s", strerror(errno));
        !            80:                return -1;
        !            81:        }
        !            82:        bzero(n, sizeof(*n));
        !            83:        bcopy(ethaddr, &n->ethaddr, sizeof(struct ether_addr));
        !            84:        n->previous = vr->vr_if->d->previous;
        !            85:        n->next = vr->vr_if->d;
        !            86:        vr->vr_if->d->previous->next = n;
        !            87:        vr->vr_if->d->previous = n;
        !            88: 
        !            89:        return 0;
        !            90: }
        !            91: 
        !            92: /*
        !            93:  * Enleve un element de la liste
        !            94:  */
        !            95: char 
        !            96: vrrp_list_delete(struct vrrp_vr * vr, struct ether_addr ethaddr)
        !            97: {
        !            98:        struct vrrp_ethaddr_list *e = vr->vr_if->p;
        !            99: 
        !           100:        while (e->next && bcmp(&ethaddr, &e->ethaddr, sizeof(ethaddr)))
        !           101:                e = e->next;
        !           102:        if (!e->next)
        !           103:                return -1;
        !           104:        e->next->previous = e->previous;
        !           105:        e->previous->next = e->next;
        !           106:        free(e);
        !           107: 
        !           108:        return 0;
        !           109: }
        !           110: 
        !           111: struct ether_addr 
        !           112: vrrp_list_get_first(struct vrrp_vr * vr)
        !           113: {
        !           114:        return vr->vr_if->p->next->ethaddr;
        !           115: }
        !           116: 
        !           117: /*
        !           118:  * Renvoie l'adresse MAC du dernier element
        !           119:  */
        !           120: struct ether_addr 
        !           121: vrrp_list_get_last(struct vrrp_vr * vr)
        !           122: {
        !           123:        return vr->vr_if->d->previous->ethaddr;
        !           124: }
        !           125: 
        !           126: void 
        !           127: vrrp_list_destroy(struct vrrp_vr * vr)
        !           128: {
        !           129:        vr->vr_if->d = vr->vr_if->d->previous;
        !           130:        while (vr->vr_if->d != vr->vr_if->p) {
        !           131:                free(vr->vr_if->d->next);
        !           132:                vr->vr_if->d = vr->vr_if->d->previous;
        !           133:        }
        !           134:        free(vr->vr_if->d);
        !           135:        free(vr->vr_if->p);
        !           136: 
        !           137:        return;
        !           138: }