f02a1e5794
SNMP option argument. That way the compiler will give a warning in case of a missing or an extra but unknown 'case:'. Do the same for SNMP LEAF objects to be prepared once gensnmptree will auto-generate enums for those too. Add an abort() after the switch() instead of the 'default:' to catch any errors. The nice side effect is that the compiler will correctly track supposed to be 'uninitialized' variables with that. When trying to set a value sanity check it before calling the OS dependent API of snmp_bridge to tell whether it is an attempt to set a bad value or a general error. Suggested by: harti (first part) Approved by: bz (mentor)
339 lines
8.3 KiB
C
339 lines
8.3 KiB
C
/*-
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* Copyright (c) 2006 Shteryana Shopova <syrinx@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Bridge MIB implementation for SNMPd.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_mib.h>
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#include <net/if_types.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <bsnmp/snmpmod.h>
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#include <bsnmp/snmp_mibII.h>
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#include "bridge_tree.h"
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#include "bridge_snmp.h"
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#include "bridge_oid.h"
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static struct lmodule *bridge_module;
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/* For the registration. */
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static const struct asn_oid oid_dot1Bridge = OIDX_dot1dBridge;
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/* The registration. */
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static uint reg_bridge;
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/* Periodic timer for polling all bridges' data. */
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static void *bridge_data_timer;
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static void *bridge_tc_timer;
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static int bridge_data_maxage = SNMP_BRIDGE_DATA_MAXAGE;
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static int bridge_poll_ticks = SNMP_BRIDGE_POLL_INTERVAL * 100;
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static int bridge_tc_poll_ticks = SNMP_BRIDGE_TC_POLL_INTERVAL * 100;
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/*
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* Our default bridge, whose info will be visible under
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* the dot1dBridge subtree and functions to set/fetch it.
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*/
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static char bif_default_name[IFNAMSIZ] = "bridge0";
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static struct bridge_if *bif_default;
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struct bridge_if *
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bridge_get_default(void)
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{
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struct mibif *ifp;
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if (bif_default != NULL) {
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/* Walk through the mibII interface list. */
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for (ifp = mib_first_if(); ifp != NULL; ifp = mib_next_if(ifp))
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if (strcmp(ifp->name, bif_default->bif_name) == 0)
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break;
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if (ifp == NULL)
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bif_default = NULL;
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}
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return (bif_default);
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}
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void
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bridge_set_default(struct bridge_if *bif)
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{
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bif_default = bif;
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syslog(LOG_ERR, "Set default bridge interface to: %s",
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bif == NULL ? "(none)" : bif->bif_name);
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}
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const char *
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bridge_get_default_name(void)
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{
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return (bif_default_name);
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}
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static int
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bridge_set_default_name(const char *bif_name, uint len)
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{
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struct bridge_if *bif;
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if (len >= IFNAMSIZ)
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return (-1);
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bcopy(bif_name, bif_default_name, len);
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bif_default_name[len] = '\0';
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if ((bif = bridge_if_find_ifname(bif_default_name)) == NULL) {
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bif_default = NULL;
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return (0);
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}
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bif_default = bif;
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return (1);
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}
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int
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bridge_get_data_maxage(void)
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{
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return (bridge_data_maxage);
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}
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static void
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bridge_set_poll_ticks(int poll_ticks)
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{
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if (bridge_data_timer != NULL)
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timer_stop(bridge_data_timer);
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bridge_poll_ticks = poll_ticks;
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bridge_data_timer = timer_start_repeat(bridge_poll_ticks,
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bridge_poll_ticks, bridge_update_all, NULL, bridge_module);
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}
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/*
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* The bridge module configuration via SNMP.
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*/
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static int
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bridge_default_name_save(struct snmp_context *ctx, const char *bridge_default)
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{
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if ((ctx->scratch->int1 = strlen(bridge_default)) >= IFNAMSIZ)
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return (-1);
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if ((ctx->scratch->ptr1 = malloc(IFNAMSIZ)) == NULL)
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return (-1);
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strncpy(ctx->scratch->ptr1, bridge_default, ctx->scratch->int1);
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return (0);
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}
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int
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op_begemot_bridge_config(struct snmp_context *ctx, struct snmp_value *val,
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uint sub, uint iidx __unused, enum snmp_op op)
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{
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switch (op) {
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case SNMP_OP_GET:
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switch (val->var.subs[sub - 1]) {
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case LEAF_begemotBridgeDefaultBridgeIf:
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return (string_get(val, bridge_get_default_name(), -1));
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case LEAF_begemotBridgeDataUpdate:
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val->v.integer = bridge_data_maxage;
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return (SNMP_ERR_NOERROR);
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case LEAF_begemotBridgeDataPoll:
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val->v.integer = bridge_poll_ticks / 100;
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return (SNMP_ERR_NOERROR);
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}
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abort();
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case SNMP_OP_GETNEXT:
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abort();
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case SNMP_OP_SET:
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switch (val->var.subs[sub - 1]) {
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case LEAF_begemotBridgeDefaultBridgeIf:
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/*
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* Cannot use string_save() here - requires either
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* a fixed-sized or var-length string - not less
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* than or equal.
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*/
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if (bridge_default_name_save(ctx,
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bridge_get_default_name()) < 0)
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return (SNMP_ERR_RES_UNAVAIL);
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if (bridge_set_default_name(val->v.octetstring.octets,
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val->v.octetstring.len) < 0)
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return (SNMP_ERR_BADVALUE);
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return (SNMP_ERR_NOERROR);
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case LEAF_begemotBridgeDataUpdate:
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if (val->v.integer < SNMP_BRIDGE_DATA_MAXAGE_MIN ||
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val->v.integer > SNMP_BRIDGE_DATA_MAXAGE_MAX)
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return (SNMP_ERR_WRONG_VALUE);
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ctx->scratch->int1 = bridge_data_maxage;
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bridge_data_maxage = val->v.integer;
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return (SNMP_ERR_NOERROR);
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case LEAF_begemotBridgeDataPoll:
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if (val->v.integer < SNMP_BRIDGE_POLL_INTERVAL_MIN ||
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val->v.integer > SNMP_BRIDGE_POLL_INTERVAL_MAX)
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return (SNMP_ERR_WRONG_VALUE);
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ctx->scratch->int1 = val->v.integer;
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return (SNMP_ERR_NOERROR);
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}
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abort();
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case SNMP_OP_ROLLBACK:
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switch (val->var.subs[sub - 1]) {
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case LEAF_begemotBridgeDefaultBridgeIf:
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bridge_set_default_name(ctx->scratch->ptr1,
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ctx->scratch->int1);
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free(ctx->scratch->ptr1);
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break;
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case LEAF_begemotBridgeDataUpdate:
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bridge_data_maxage = ctx->scratch->int1;
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break;
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}
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return (SNMP_ERR_NOERROR);
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case SNMP_OP_COMMIT:
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switch (val->var.subs[sub - 1]) {
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case LEAF_begemotBridgeDefaultBridgeIf:
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free(ctx->scratch->ptr1);
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break;
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case LEAF_begemotBridgeDataPoll:
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bridge_set_poll_ticks(ctx->scratch->int1 * 100);
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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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abort();
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}
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/*
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* Bridge mib module initialization hook.
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* Returns 0 on success, < 0 on error.
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*/
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static int
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bridge_init(struct lmodule * mod, int argc __unused, char *argv[] __unused)
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{
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bridge_module = mod;
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if (bridge_kmod_load() < 0)
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return (-1);
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if (bridge_ioctl_init() < 0)
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return (-1);
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/* Register to get creation messages for bridge interfaces. */
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if (mib_register_newif(bridge_attach_newif, bridge_module)) {
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syslog(LOG_ERR, "Cannot register newif function: %s",
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strerror(errno));
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return (-1);
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}
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return (0);
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}
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/*
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* Bridge mib module finalization hook.
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*/
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static int
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bridge_fini(void)
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{
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mib_unregister_newif(bridge_module);
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or_unregister(reg_bridge);
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if (bridge_data_timer != NULL) {
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timer_stop(bridge_data_timer);
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bridge_data_timer = NULL;
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}
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if (bridge_tc_timer != NULL) {
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timer_stop(bridge_tc_timer);
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bridge_tc_timer = NULL;
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}
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bridge_ifs_fini();
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bridge_ports_fini();
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bridge_addrs_fini();
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return (0);
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}
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/*
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* Bridge mib module start operation.
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*/
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static void
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bridge_start(void)
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{
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reg_bridge = or_register(&oid_dot1Bridge,
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"The IETF MIB for Bridges (RFC 4188).", bridge_module);
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bridge_data_timer = timer_start_repeat(bridge_poll_ticks,
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bridge_poll_ticks, bridge_update_all, NULL, bridge_module);
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bridge_tc_timer = timer_start_repeat(bridge_tc_poll_ticks,
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bridge_tc_poll_ticks, bridge_update_tc_time, NULL, bridge_module);
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}
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static void
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bridge_dump(void)
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{
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struct bridge_if *bif;
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if ((bif = bridge_get_default()) == NULL)
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syslog(LOG_ERR, "Dump: no default bridge interface");
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else
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syslog(LOG_ERR, "Dump: default bridge interface %s",
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bif->bif_name);
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bridge_ifs_dump();
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bridge_pf_dump();
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}
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const struct snmp_module config = {
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.comment = "This module implements the bridge mib (RFC 4188).",
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.init = bridge_init,
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.fini = bridge_fini,
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.start = bridge_start,
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.tree = bridge_ctree,
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.dump = bridge_dump,
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.tree_size = bridge_CTREE_SIZE,
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};
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