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/*
* Copyright (c) 2001-2003
* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
* All rights reserved.
*
* Author: Harti Brandt <harti@freebsd.org>
*
* Redistribution and use in source and binary forms, with or 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.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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.
*
* $Begemot: bsnmp/snmp_mibII/mibII_nettomedia.c,v 1.8 2004/08/06 08:47:03 brandt Exp $
*
* Read-only implementation of the Arp table (ipNetToMediaTable)
*
* The problem with the table is, that we don't receive routing message
* when a) an arp table entry is resolved and b) when an arp table entry is
* deleted automatically. Therefor we need to poll the table from time to
* time.
*/
#include "mibII.h"
#include "mibII_oid.h"
#define ARPREFRESH 30
struct mibarp *
mib_find_arp(const struct mibif *ifp, struct in_addr in)
{
struct mibarp *at;
uint32_t a = ntohl(in.s_addr);
if (get_ticks() >= mibarpticks + ARPREFRESH)
mib_arp_update();
TAILQ_FOREACH(at, &mibarp_list, link)
if (at->index.subs[0] == ifp->index &&
(at->index.subs[1] == ((a >> 24) & 0xff)) &&
(at->index.subs[2] == ((a >> 16) & 0xff)) &&
(at->index.subs[3] == ((a >> 8) & 0xff)) &&
(at->index.subs[4] == ((a >> 0) & 0xff)))
return (at);
return (NULL);
}
struct mibarp *
mib_arp_create(const struct mibif *ifp, struct in_addr in, const u_char *phys,
size_t physlen)
{
struct mibarp *at;
uint32_t a = ntohl(in.s_addr);
if ((at = malloc(sizeof(*at))) == NULL)
return (NULL);
at->flags = 0;
at->index.len = 5;
at->index.subs[0] = ifp->index;
at->index.subs[1] = (a >> 24) & 0xff;
at->index.subs[2] = (a >> 16) & 0xff;
at->index.subs[3] = (a >> 8) & 0xff;
at->index.subs[4] = (a >> 0) & 0xff;
if ((at->physlen = physlen) > sizeof(at->phys))
at->physlen = sizeof(at->phys);
memcpy(at->phys, phys, at->physlen);
INSERT_OBJECT_OID(at, &mibarp_list);
return (at);
}
void
mib_arp_delete(struct mibarp *at)
{
TAILQ_REMOVE(&mibarp_list, at, link);
free(at);
}
int
op_nettomedia(struct snmp_context *ctx __unused, struct snmp_value *value,
u_int sub, u_int iidx __unused, enum snmp_op op)
{
struct mibarp *at;
at = NULL; /* gcc */
if (get_ticks() >= mibarpticks + ARPREFRESH)
mib_arp_update();
switch (op) {
case SNMP_OP_GETNEXT:
if ((at = NEXT_OBJECT_OID(&mibarp_list, &value->var, sub)) == NULL)
return (SNMP_ERR_NOSUCHNAME);
index_append(&value->var, sub, &at->index);
break;
case SNMP_OP_GET:
if ((at = FIND_OBJECT_OID(&mibarp_list, &value->var, sub)) == NULL)
return (SNMP_ERR_NOSUCHNAME);
break;
case SNMP_OP_SET:
if ((at = FIND_OBJECT_OID(&mibarp_list, &value->var, sub)) == NULL)
return (SNMP_ERR_NO_CREATION);
return (SNMP_ERR_NOT_WRITEABLE);
case SNMP_OP_ROLLBACK:
case SNMP_OP_COMMIT:
abort();
}
switch (value->var.subs[sub - 1]) {
case LEAF_ipNetToMediaIfIndex:
value->v.integer = at->index.subs[0];
break;
case LEAF_ipNetToMediaPhysAddress:
return (string_get(value, at->phys, at->physlen));
case LEAF_ipNetToMediaNetAddress:
value->v.ipaddress[0] = at->index.subs[1];
value->v.ipaddress[1] = at->index.subs[2];
value->v.ipaddress[2] = at->index.subs[3];
value->v.ipaddress[3] = at->index.subs[4];
break;
case LEAF_ipNetToMediaType:
value->v.integer = (at->flags & MIBARP_PERM) ? 4 : 3;
break;
}
return (SNMP_ERR_NOERROR);
}
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