155 lines
4.7 KiB
C
155 lines
4.7 KiB
C
/*
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* Copyright (c) 2001-2003
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* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
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* All rights reserved.
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*
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* Author: Harti Brandt <harti@freebsd.org>
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*
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* Redistribution of this software and documentation and use in source and
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* binary forms, with or without modification, are permitted provided that
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* the following conditions are met:
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*
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* 1. Redistributions of source code or documentation must retain the above
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* copyright notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE AND DOCUMENTATION IS PROVIDED BY FRAUNHOFER FOKUS
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* AND ITS CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* FRAUNHOFER FOKUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Begemot: bsnmp/snmp_mibII/mibII_nettomedia.c,v 1.6 2003/01/28 13:44:35 hbb Exp $
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*
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* Read-only implementation of the Arp table (ipNetToMediaTable)
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*
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* The problem with the table is, that we don't receive routing message
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* when a) an arp table entry is resolved and b) when an arp table entry is
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* deleted automatically. Therefor we need to poll the table from time to
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* time.
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*/
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#include "mibII.h"
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#include "mibII_oid.h"
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#define ARPREFRESH 30
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struct mibarp *
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mib_find_arp(const struct mibif *ifp, struct in_addr in)
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{
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struct mibarp *at;
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u_int32_t a = ntohl(in.s_addr);
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if (get_ticks() >= mibarpticks + ARPREFRESH)
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mib_arp_update();
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TAILQ_FOREACH(at, &mibarp_list, link)
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if (at->index.subs[0] == ifp->index &&
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(at->index.subs[1] == ((a >> 24) & 0xff)) &&
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(at->index.subs[2] == ((a >> 16) & 0xff)) &&
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(at->index.subs[3] == ((a >> 8) & 0xff)) &&
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(at->index.subs[4] == ((a >> 0) & 0xff)))
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return (at);
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return (NULL);
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}
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struct mibarp *
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mib_arp_create(const struct mibif *ifp, struct in_addr in, const u_char *phys,
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size_t physlen)
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{
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struct mibarp *at;
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u_int32_t a = ntohl(in.s_addr);
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if ((at = malloc(sizeof(*at))) == NULL)
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return (NULL);
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at->flags = 0;
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at->index.len = 5;
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at->index.subs[0] = ifp->index;
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at->index.subs[1] = (a >> 24) & 0xff;
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at->index.subs[2] = (a >> 16) & 0xff;
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at->index.subs[3] = (a >> 8) & 0xff;
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at->index.subs[4] = (a >> 0) & 0xff;
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if ((at->physlen = physlen) > sizeof(at->phys))
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at->physlen = sizeof(at->phys);
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memcpy(at->phys, phys, at->physlen);
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INSERT_OBJECT_OID(at, &mibarp_list);
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return (at);
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}
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void
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mib_arp_delete(struct mibarp *at)
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{
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TAILQ_REMOVE(&mibarp_list, at, link);
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free(at);
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}
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int
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op_nettomedia(struct snmp_context *ctx __unused, struct snmp_value *value,
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u_int sub, u_int iidx __unused, enum snmp_op op)
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{
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struct mibarp *at;
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at = NULL; /* gcc */
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if (get_ticks() >= mibarpticks + ARPREFRESH)
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mib_arp_update();
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switch (op) {
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case SNMP_OP_GETNEXT:
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if ((at = NEXT_OBJECT_OID(&mibarp_list, &value->var, sub)) == NULL)
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return (SNMP_ERR_NOSUCHNAME);
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index_append(&value->var, sub, &at->index);
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break;
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case SNMP_OP_GET:
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if ((at = FIND_OBJECT_OID(&mibarp_list, &value->var, sub)) == NULL)
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return (SNMP_ERR_NOSUCHNAME);
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break;
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case SNMP_OP_SET:
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if ((at = FIND_OBJECT_OID(&mibarp_list, &value->var, sub)) == NULL)
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return (SNMP_ERR_NO_CREATION);
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return (SNMP_ERR_NOT_WRITEABLE);
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case SNMP_OP_ROLLBACK:
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case SNMP_OP_COMMIT:
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abort();
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}
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switch (value->var.subs[sub - 1]) {
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case LEAF_ipNetToMediaIfIndex:
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value->v.integer = at->index.subs[0];
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break;
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case LEAF_ipNetToMediaPhysAddress:
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return (string_get(value, at->phys, at->physlen));
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case LEAF_ipNetToMediaNetAddress:
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value->v.ipaddress[0] = at->index.subs[1];
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value->v.ipaddress[1] = at->index.subs[2];
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value->v.ipaddress[2] = at->index.subs[3];
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value->v.ipaddress[3] = at->index.subs[4];
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break;
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case LEAF_ipNetToMediaType:
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value->v.integer = (at->flags & MIBARP_PERM) ? 4 : 3;
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break;
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}
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return (SNMP_ERR_NOERROR);
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}
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