/contrib/bsnmp/snmp_mibII/mibII_nettomedia.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 150 lines · 90 code · 23 blank · 37 comment · 19 complexity · 3a428bbe08143369398b23da80edd4c5 MD5 · raw file
- /*
- * 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);
- }