![Guy Harris](/assets/img/avatar_default.png)
are no entries in any of the MIBs for any of the components of the variable's OID. svn path=/trunk/; revision=2961
2293 lines
63 KiB
C
2293 lines
63 KiB
C
/* packet-snmp.c
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* Routines for SNMP (simple network management protocol)
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* D.Jorand (c) 1998
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*
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* See RFC 1157 for SNMPv1.
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*
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* See RFCs 1901, 1905, and 1906 for SNMPv2c.
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*
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* See RFCs 1905, 1906, 1909, and 1910 for SNMPv2u.
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*
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* $Id: packet-snmp.c,v 1.59 2001/01/30 07:16:28 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Didier Jorand
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*
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* Some stuff from:
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*
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* GXSNMP -- An snmp mangament application
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* Copyright (C) 1998 Gregory McLean & Jochen Friedrich
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* Beholder RMON ethernet network monitor,Copyright (C) 1993 DNPAP group
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#define MAX_STRING_LEN 2048 /* TBC */
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#ifdef linux
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#include <dlfcn.h>
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#endif
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#include <glib.h>
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#include "packet.h"
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#include "strutil.h"
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#include "conversation.h"
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#include "etypes.h"
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#include "packet-ipx.h"
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#if defined(HAVE_UCD_SNMP_SNMP_H) || defined(HAVE_SNMP_SNMP_H)
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/*
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* UCD or CMU SNMP?
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*/
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# if defined(HAVE_UCD_SNMP_SNMP_H)
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/*
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* UCD SNMP.
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*/
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# include <ucd-snmp/asn1.h>
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# include <ucd-snmp/snmp_api.h>
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# include <ucd-snmp/snmp_impl.h>
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# include <ucd-snmp/mib.h>
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/*
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* Sigh. UCD SNMP 4.1.1 makes "snmp_set_suffix_only()" a macro
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* that calls "ds_set_int()" with the first two arguments
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* being DS_LIBRARY_ID and DS_LIB_PRINT_SUFFIX_ONLY; this means that,
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* when building with 4.1.1, we need to arrange that
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* <ucd-snmp/default_store.h> is included, to define those two values
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* and to declare "ds_int()".
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*
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* However:
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*
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* 1) we can't include it on earlier versions (at least not 3.6.2),
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* as it doesn't exist in those versions;
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*
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* 2) we don't want to include <ucd-snmp/ucd-snmp-includes.h>,
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* as that includes <ucd-snmp/snmp.h>, and that defines a whole
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* bunch of values that we also define ourselves.
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*
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* So we only include it if "snmp_set_suffix_only" is defined as
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* a macro.
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*/
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# ifdef snmp_set_suffix_only
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# include <ucd-snmp/default_store.h>
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# endif
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/*
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* XXX - for now, we assume all versions of UCD SNMP have it.
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*/
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# define HAVE_SPRINT_VALUE
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/*
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* Define values "sprint_value()" expects.
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*/
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# define VALTYPE_INTEGER ASN_INTEGER
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# define VALTYPE_COUNTER ASN_COUNTER
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# define VALTYPE_GAUGE ASN_GAUGE
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# define VALTYPE_TIMETICKS ASN_TIMETICKS
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# define VALTYPE_STRING ASN_OCTET_STR
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# define VALTYPE_IPADDR ASN_IPADDRESS
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# define VALTYPE_OPAQUE ASN_OPAQUE
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# define VALTYPE_NSAP ASN_NSAP
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# define VALTYPE_OBJECTID ASN_OBJECT_ID
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# define VALTYPE_BITSTR ASN_BIT_STR
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# define VALTYPE_COUNTER64 ASN_COUNTER64
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# elif defined(HAVE_SNMP_SNMP_H)
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/*
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* CMU SNMP.
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*/
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# include <snmp/snmp.h>
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/*
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* Some older versions of CMU SNMP may lack these values (e.g., the
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* "libsnmp3.6" package for Debian, which is based on some old
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* CMU SNMP, perhaps 1.0); for now, we assume they also lack
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* "sprint_value()".
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*/
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# ifdef SMI_INTEGER
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# define HAVE_SPRINT_VALUE
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/*
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* Define values "sprint_value()" expects.
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*/
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# define VALTYPE_INTEGER SMI_INTEGER
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# define VALTYPE_COUNTER SMI_COUNTER32
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# define VALTYPE_GAUGE SMI_GAUGE32
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# define VALTYPE_TIMETICKS SMI_TIMETICKS
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# define VALTYPE_STRING SMI_STRING
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# define VALTYPE_IPADDR SMI_IPADDRESS
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# define VALTYPE_OPAQUE SMI_OPAQUE
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# define VALTYPE_NSAP SMI_STRING
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# define VALTYPE_OBJECTID SMI_OBJID
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# define VALTYPE_BITSTR ASN_BIT_STR
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# define VALTYPE_COUNTER64 SMI_COUNTER64
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# endif
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/*
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* Now undo all the definitions they "helpfully" gave us, so we don't get
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* complaints about redefining them.
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*
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* Why, oh why, is there no library that provides code to
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*
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* 1) read MIB files;
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*
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* 2) translate object IDs into names;
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*
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* 3) let you find out, for a given object ID, what the type, enum
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* values, display hint, etc. are;
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*
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* in a *simple* fashion, without assuming that your code is part of an
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* SNMP agent or client that wants a pile of definitions of PDU types,
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* etc.? Is it just that 99 44/100% of the code that uses an SNMP library
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* *is* part of an agent or client, and really *does* need that stuff,
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* and *doesn't* need the interfaces we want?
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*/
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# undef SNMP_ERR_NOERROR
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# undef SNMP_ERR_TOOBIG
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# undef SNMP_ERR_NOSUCHNAME
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# undef SNMP_ERR_BADVALUE
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# undef SNMP_ERR_READONLY
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# undef SNMP_ERR_NOACCESS
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# undef SNMP_ERR_WRONGTYPE
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# undef SNMP_ERR_WRONGLENGTH
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# undef SNMP_ERR_WRONGENCODING
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# undef SNMP_ERR_WRONGVALUE
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# undef SNMP_ERR_NOCREATION
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# undef SNMP_ERR_INCONSISTENTVALUE
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# undef SNMP_ERR_RESOURCEUNAVAILABLE
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# undef SNMP_ERR_COMMITFAILED
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# undef SNMP_ERR_UNDOFAILED
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# undef SNMP_ERR_AUTHORIZATIONERROR
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# undef SNMP_ERR_NOTWRITABLE
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# undef SNMP_ERR_INCONSISTENTNAME
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# undef SNMP_TRAP_COLDSTART
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# undef SNMP_TRAP_WARMSTART
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# undef SNMP_TRAP_LINKDOWN
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# undef SNMP_TRAP_LINKUP
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# undef SNMP_TRAP_EGPNEIGHBORLOSS
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# undef SNMP_TRAP_ENTERPRISESPECIFIC
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# endif
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#endif
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#include "asn1.h"
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#include "packet-snmp.h"
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/* Null string of type "guchar[]". */
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static const guchar nullstring[] = "";
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/* Take a pointer that may be null and return a pointer that's not null
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by turning null pointers into pointers to the above null string. */
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#define SAFE_STRING(s) (((s) != NULL) ? (s) : nullstring)
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static int proto_snmp = -1;
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static int proto_smux = -1;
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static gint ett_snmp = -1;
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static gint ett_smux = -1;
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static gint ett_parameters = -1;
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static gint ett_parameters_qos = -1;
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static gint ett_global = -1;
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static gint ett_flags = -1;
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static gint ett_secur = -1;
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static int hf_snmpv3_flags = -1;
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static int hf_snmpv3_flags_auth = -1;
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static int hf_snmpv3_flags_crypt = -1;
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static int hf_snmpv3_flags_report = -1;
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#define TH_AUTH 0x01
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#define TH_CRYPT 0x02
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#define TH_REPORT 0x04
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static const true_false_string flags_set_truth = {
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"Set",
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"Not set"
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};
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#define UDP_PORT_SNMP 161
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#define UDP_PORT_SNMP_TRAP 162
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#define TCP_PORT_SMUX 199
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/* Protocol version numbers */
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#define SNMP_VERSION_1 0
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#define SNMP_VERSION_2c 1
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#define SNMP_VERSION_2u 2
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#define SNMP_VERSION_3 3
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static const value_string versions[] = {
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{ SNMP_VERSION_1, "1" },
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{ SNMP_VERSION_2c, "2C" },
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{ SNMP_VERSION_2u, "2U" },
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{ SNMP_VERSION_3, "3" },
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{ 0, NULL },
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};
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/* PDU types */
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#define SNMP_MSG_GET 0
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#define SNMP_MSG_GETNEXT 1
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#define SNMP_MSG_RESPONSE 2
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#define SNMP_MSG_SET 3
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#define SNMP_MSG_TRAP 4
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#define SNMP_MSG_GETBULK 5
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#define SNMP_MSG_INFORM 6
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#define SNMP_MSG_TRAP2 7
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#define SNMP_MSG_REPORT 8
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static const value_string pdu_types[] = {
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{ SNMP_MSG_GET, "GET" },
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{ SNMP_MSG_GETNEXT, "GET-NEXT" },
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{ SNMP_MSG_SET, "SET" },
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{ SNMP_MSG_RESPONSE, "RESPONSE" },
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{ SNMP_MSG_TRAP, "TRAP-V1" },
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{ SNMP_MSG_GETBULK, "GETBULK" },
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{ SNMP_MSG_INFORM, "INFORM" },
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{ SNMP_MSG_TRAP2, "TRAP-V2" },
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{ SNMP_MSG_REPORT, "REPORT" },
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{ 0, NULL }
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};
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/* SMUX PDU types */
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#define SMUX_MSG_OPEN 0
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#define SMUX_MSG_CLOSE 1
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#define SMUX_MSG_RREQ 2
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#define SMUX_MSG_RRSP 3
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#define SMUX_MSG_SOUT 4
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static const value_string smux_types[] = {
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{ SMUX_MSG_OPEN, "Open" },
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{ SMUX_MSG_CLOSE, "Close" },
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{ SMUX_MSG_RREQ, "Registration Request" },
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{ SMUX_MSG_RRSP, "Registration Response" },
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{ SMUX_MSG_SOUT, "Commit Or Rollback" },
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{ 0, NULL }
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};
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/* SMUX Closing causes */
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#define SMUX_CLOSE_DOWN 0
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#define SMUX_CLOSE_VERSION 1
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#define SMUX_CLOSE_PACKET 2
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#define SMUX_CLOSE_PROTOCOL 3
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#define SMUX_CLOSE_INTERNAL 4
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#define SMUX_CLOSE_NOAUTH 5
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static const value_string smux_close[] = {
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{ SMUX_CLOSE_DOWN, "Going down" },
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{ SMUX_CLOSE_VERSION, "Unsupported Version" },
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{ SMUX_CLOSE_PACKET, "Packet Format Error" },
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{ SMUX_CLOSE_PROTOCOL, "Protocol Error" },
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{ SMUX_CLOSE_INTERNAL, "Internal Error" },
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{ SMUX_CLOSE_NOAUTH, "Unauthorized" },
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{ 0, NULL }
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};
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/* SMUX Request codes */
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#define SMUX_RREQ_DELETE 0
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#define SMUX_RREQ_READONLY 1
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#define SMUX_RREQ_READWRITE 2
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static const value_string smux_rreq[] = {
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{ SMUX_RREQ_DELETE, "Delete" },
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{ SMUX_RREQ_READONLY, "Read Only" },
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{ SMUX_RREQ_READWRITE, "Read Write" },
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{ 0, NULL }
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};
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static const value_string smux_prio[] = {
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{ -1, "Failure" },
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{ 0, NULL }
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};
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/* SMUX SOut codes */
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#define SMUX_SOUT_COMMIT 0
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#define SMUX_SOUT_ROLLBACK 1
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static const value_string smux_sout[] = {
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{ SMUX_SOUT_COMMIT, "Commit" },
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{ SMUX_SOUT_ROLLBACK, "Rollback" },
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{ 0, NULL }
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};
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/* Error status values */
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#define SNMP_ERR_NOERROR 0
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#define SNMP_ERR_TOOBIG 1
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#define SNMP_ERR_NOSUCHNAME 2
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#define SNMP_ERR_BADVALUE 3
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#define SNMP_ERR_READONLY 4
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#define SNMP_ERR_GENERROR 5
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#define SNMP_ERR_NOACCESS 6
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#define SNMP_ERR_WRONGTYPE 7
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#define SNMP_ERR_WRONGLENGTH 8
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#define SNMP_ERR_WRONGENCODING 9
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#define SNMP_ERR_WRONGVALUE 10
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#define SNMP_ERR_NOCREATION 11
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#define SNMP_ERR_INCONSISTENTVALUE 12
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#define SNMP_ERR_RESOURCEUNAVAILABLE 13
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#define SNMP_ERR_COMMITFAILED 14
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#define SNMP_ERR_UNDOFAILED 15
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#define SNMP_ERR_AUTHORIZATIONERROR 16
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#define SNMP_ERR_NOTWRITABLE 17
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#define SNMP_ERR_INCONSISTENTNAME 18
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static const value_string error_statuses[] = {
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{ SNMP_ERR_NOERROR, "NO ERROR" },
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{ SNMP_ERR_TOOBIG, "TOOBIG" },
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{ SNMP_ERR_NOSUCHNAME, "NO SUCH NAME" },
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{ SNMP_ERR_BADVALUE, "BAD VALUE" },
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{ SNMP_ERR_READONLY, "READ ONLY" },
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{ SNMP_ERR_GENERROR, "GENERIC ERROR" },
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{ SNMP_ERR_NOACCESS, "NO ACCESS" },
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{ SNMP_ERR_WRONGTYPE, "WRONG TYPE" },
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{ SNMP_ERR_WRONGLENGTH, "WRONG LENGTH" },
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{ SNMP_ERR_WRONGENCODING, "WRONG ENCODING" },
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{ SNMP_ERR_WRONGVALUE, "WRONG VALUE" },
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{ SNMP_ERR_NOCREATION, "NO CREATION" },
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{ SNMP_ERR_INCONSISTENTVALUE, "INCONSISTENT VALUE" },
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{ SNMP_ERR_RESOURCEUNAVAILABLE, "RESOURCE UNAVAILABLE" },
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{ SNMP_ERR_COMMITFAILED, "COMMIT FAILED" },
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{ SNMP_ERR_UNDOFAILED, "UNDO FAILED" },
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{ SNMP_ERR_AUTHORIZATIONERROR, "AUTHORIZATION ERROR" },
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{ SNMP_ERR_NOTWRITABLE, "NOT WRITABLE" },
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{ SNMP_ERR_INCONSISTENTNAME, "INCONSISTENT NAME" },
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{ 0, NULL }
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};
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/* General SNMP V1 Traps */
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#define SNMP_TRAP_COLDSTART 0
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#define SNMP_TRAP_WARMSTART 1
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#define SNMP_TRAP_LINKDOWN 2
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#define SNMP_TRAP_LINKUP 3
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#define SNMP_TRAP_AUTHFAIL 4
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#define SNMP_TRAP_EGPNEIGHBORLOSS 5
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#define SNMP_TRAP_ENTERPRISESPECIFIC 6
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static const value_string trap_types[] = {
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{ SNMP_TRAP_COLDSTART, "COLD START" },
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{ SNMP_TRAP_WARMSTART, "WARM START" },
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{ SNMP_TRAP_LINKDOWN, "LINK DOWN" },
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{ SNMP_TRAP_LINKUP, "LINK UP" },
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{ SNMP_TRAP_AUTHFAIL, "AUTHENTICATION FAILED" },
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{ SNMP_TRAP_EGPNEIGHBORLOSS, "EGP NEIGHBORLOSS" },
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{ SNMP_TRAP_ENTERPRISESPECIFIC, "ENTERPRISE SPECIFIC" },
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{ 0, NULL }
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};
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/* Security Models */
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#define SNMP_SEC_ANY 0
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#define SNMP_SEC_V1 1
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#define SNMP_SEC_V2C 2
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#define SNMP_SEC_USM 3
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static const value_string sec_models[] = {
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{ SNMP_SEC_ANY, "Any" },
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{ SNMP_SEC_V1, "V1" },
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{ SNMP_SEC_V2C, "V2C" },
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{ SNMP_SEC_USM, "USM" },
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{ 0, NULL }
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};
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/* SNMP Tags */
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#define SNMP_IPA 0 /* IP Address */
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#define SNMP_CNT 1 /* Counter (Counter32) */
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#define SNMP_GGE 2 /* Gauge (Gauge32) */
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#define SNMP_TIT 3 /* TimeTicks */
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#define SNMP_OPQ 4 /* Opaque */
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#define SNMP_NSP 5 /* NsapAddress */
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#define SNMP_C64 6 /* Counter64 */
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#define SNMP_U32 7 /* Uinteger32 */
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#define SERR_NSO 0
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#define SERR_NSI 1
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#define SERR_EOM 2
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/* SNMPv1 Types */
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#define SNMP_NULL 0
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#define SNMP_INTEGER 1 /* l */
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#define SNMP_OCTETSTR 2 /* c */
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#define SNMP_DISPLAYSTR 2 /* c */
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#define SNMP_OBJECTID 3 /* ul */
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#define SNMP_IPADDR 4 /* uc */
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#define SNMP_COUNTER 5 /* ul */
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#define SNMP_GAUGE 6 /* ul */
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#define SNMP_TIMETICKS 7 /* ul */
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#define SNMP_OPAQUE 8 /* c */
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/* additional SNMPv2 Types */
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#define SNMP_UINTEGER 5 /* ul */
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#define SNMP_BITSTR 9 /* uc */
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#define SNMP_NSAP 10 /* uc */
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#define SNMP_COUNTER64 11 /* ul */
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#define SNMP_NOSUCHOBJECT 12
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#define SNMP_NOSUCHINSTANCE 13
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#define SNMP_ENDOFMIBVIEW 14
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typedef struct _SNMP_CNV SNMP_CNV;
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struct _SNMP_CNV
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{
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guint class;
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guint tag;
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gint syntax;
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gchar *name;
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};
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|
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static SNMP_CNV SnmpCnv [] =
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{
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{ASN1_UNI, ASN1_NUL, SNMP_NULL, "NULL"},
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{ASN1_UNI, ASN1_INT, SNMP_INTEGER, "INTEGER"},
|
|
{ASN1_UNI, ASN1_OTS, SNMP_OCTETSTR, "OCTET STRING"},
|
|
{ASN1_UNI, ASN1_OJI, SNMP_OBJECTID, "OBJECTID"},
|
|
{ASN1_APL, SNMP_IPA, SNMP_IPADDR, "IPADDR"},
|
|
{ASN1_APL, SNMP_CNT, SNMP_COUNTER, "COUNTER"}, /* Counter32 */
|
|
{ASN1_APL, SNMP_GGE, SNMP_GAUGE, "GAUGE"}, /* Gauge32 == Unsigned32 */
|
|
{ASN1_APL, SNMP_TIT, SNMP_TIMETICKS, "TIMETICKS"},
|
|
{ASN1_APL, SNMP_OPQ, SNMP_OPAQUE, "OPAQUE"},
|
|
|
|
/* SNMPv2 data types and errors */
|
|
|
|
{ASN1_UNI, ASN1_BTS, SNMP_BITSTR, "BITSTR"},
|
|
{ASN1_APL, SNMP_C64, SNMP_COUNTER64, "COUNTER64"},
|
|
{ASN1_CTX, SERR_NSO, SNMP_NOSUCHOBJECT, "NOSUCHOBJECT"},
|
|
{ASN1_CTX, SERR_NSI, SNMP_NOSUCHINSTANCE, "NOSUCHINSTANCE"},
|
|
{ASN1_CTX, SERR_EOM, SNMP_ENDOFMIBVIEW, "ENDOFMIBVIEW"},
|
|
{0, 0, -1, NULL}
|
|
};
|
|
|
|
/*
|
|
* NAME: g_snmp_tag_cls2syntax
|
|
* SYNOPSIS: gboolean g_snmp_tag_cls2syntax
|
|
* (
|
|
* guint tag,
|
|
* guint cls,
|
|
* gushort *syntax
|
|
* )
|
|
* DESCRIPTION: Converts ASN1 tag and class to Syntax tag and name.
|
|
* See SnmpCnv for conversion.
|
|
* RETURNS: name on success, NULL on failure
|
|
*/
|
|
|
|
static gchar *
|
|
snmp_tag_cls2syntax ( guint tag, guint cls, gushort *syntax)
|
|
{
|
|
SNMP_CNV *cnv;
|
|
|
|
cnv = SnmpCnv;
|
|
while (cnv->syntax != -1)
|
|
{
|
|
if (cnv->tag == tag && cnv->class == cls)
|
|
{
|
|
*syntax = cnv->syntax;
|
|
return cnv->name;
|
|
}
|
|
cnv++;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
dissect_snmp_parse_error(const u_char *pd, int offset, frame_data *fd,
|
|
proto_tree *tree, const char *field_name, int ret)
|
|
{
|
|
const gchar *errstr;
|
|
|
|
if (check_col(fd, COL_INFO)) {
|
|
switch (ret) {
|
|
|
|
case ASN1_ERR_EMPTY:
|
|
errstr = "Ran out of data";
|
|
break;
|
|
|
|
case ASN1_ERR_EOC_MISMATCH:
|
|
errstr = "EOC mismatch";
|
|
break;
|
|
|
|
case ASN1_ERR_WRONG_TYPE:
|
|
errstr = "Wrong type for that item";
|
|
break;
|
|
|
|
case ASN1_ERR_LENGTH_NOT_DEFINITE:
|
|
errstr = "Length was indefinite";
|
|
break;
|
|
|
|
case ASN1_ERR_LENGTH_MISMATCH:
|
|
errstr = "Length mismatch";
|
|
break;
|
|
|
|
case ASN1_ERR_WRONG_LENGTH_FOR_TYPE:
|
|
errstr = "Wrong length for that item's type";
|
|
break;
|
|
|
|
default:
|
|
errstr = "Unknown error";
|
|
break;
|
|
}
|
|
col_add_fstr(fd, COL_INFO,
|
|
"ERROR: Couldn't parse %s: %s", field_name, errstr);
|
|
}
|
|
|
|
old_dissect_data(pd, offset, fd, tree);
|
|
}
|
|
|
|
static void
|
|
dissect_snmp_error(const u_char *pd, int offset, frame_data *fd,
|
|
proto_tree *tree, const char *message)
|
|
{
|
|
if (check_col(fd, COL_INFO))
|
|
col_add_str(fd, COL_INFO, message);
|
|
|
|
old_dissect_data(pd, offset, fd, tree);
|
|
}
|
|
|
|
static gchar *
|
|
format_oid(subid_t *oid, guint oid_length)
|
|
{
|
|
char *result;
|
|
int result_len;
|
|
int len, i;
|
|
char *buf;
|
|
|
|
result_len = oid_length * 22;
|
|
result = g_malloc(result_len + 1);
|
|
buf = result;
|
|
len = sprintf(buf, "%lu", (unsigned long)oid[0]);
|
|
buf += len;
|
|
for (i = 1; i < oid_length;i++) {
|
|
len = sprintf(buf, ".%lu", (unsigned long)oid[i]);
|
|
buf += len;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#ifdef HAVE_SPRINT_VALUE
|
|
static gchar *
|
|
format_var(struct variable_list *variable, subid_t *variable_oid,
|
|
guint variable_oid_length, gushort vb_type, guint vb_length)
|
|
{
|
|
gchar *buf;
|
|
|
|
switch (vb_type) {
|
|
|
|
case SNMP_INTEGER:
|
|
case SNMP_COUNTER:
|
|
case SNMP_GAUGE:
|
|
case SNMP_TIMETICKS:
|
|
/* We don't know how long this will be, but let's guess it
|
|
fits within 128 characters; that should be enough for an
|
|
integral value plus some sort of type indication. */
|
|
buf = g_malloc(128);
|
|
break;
|
|
|
|
case SNMP_OCTETSTR:
|
|
case SNMP_IPADDR:
|
|
case SNMP_OPAQUE:
|
|
case SNMP_NSAP:
|
|
case SNMP_BITSTR:
|
|
case SNMP_COUNTER64:
|
|
/* We don't know how long this will be, but let's guess it
|
|
fits within 128 characters plus 4 characters per octet. */
|
|
buf = g_malloc(128 + 4*vb_length);
|
|
break;
|
|
|
|
case SNMP_OBJECTID:
|
|
/* We don't know how long this will be, but let's guess it
|
|
fits within 128 characters plus 32 characters per subid
|
|
(10 digits plus period, or a subid name). */
|
|
buf = g_malloc(1024 + 32*vb_length);
|
|
break;
|
|
|
|
default:
|
|
/* Should not happen. */
|
|
g_assert_not_reached();
|
|
buf = NULL;
|
|
break;
|
|
}
|
|
|
|
variable->next_variable = NULL;
|
|
variable->name = variable_oid;
|
|
variable->name_length = variable_oid_length;
|
|
switch (vb_type) {
|
|
|
|
case SNMP_INTEGER:
|
|
variable->type = VALTYPE_INTEGER;
|
|
break;
|
|
|
|
case SNMP_COUNTER:
|
|
variable->type = VALTYPE_COUNTER;
|
|
break;
|
|
|
|
case SNMP_GAUGE:
|
|
variable->type = VALTYPE_GAUGE;
|
|
break;
|
|
|
|
case SNMP_TIMETICKS:
|
|
variable->type = VALTYPE_TIMETICKS;
|
|
break;
|
|
|
|
case SNMP_OCTETSTR:
|
|
variable->type = VALTYPE_STRING;
|
|
break;
|
|
|
|
case SNMP_IPADDR:
|
|
variable->type = VALTYPE_IPADDR;
|
|
break;
|
|
|
|
case SNMP_OPAQUE:
|
|
variable->type = VALTYPE_OPAQUE;
|
|
break;
|
|
|
|
case SNMP_NSAP:
|
|
variable->type = VALTYPE_NSAP;
|
|
break;
|
|
|
|
case SNMP_OBJECTID:
|
|
variable->type = VALTYPE_OBJECTID;
|
|
vb_length *= sizeof (subid_t); /* XXX - necessary? */
|
|
break;
|
|
|
|
case SNMP_BITSTR:
|
|
variable->type = VALTYPE_BITSTR;
|
|
break;
|
|
|
|
case SNMP_COUNTER64:
|
|
variable->type = VALTYPE_COUNTER64;
|
|
break;
|
|
}
|
|
variable->val_len = vb_length;
|
|
|
|
sprint_value(buf, variable_oid, variable_oid_length, variable);
|
|
return buf;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
snmp_variable_decode(proto_tree *snmp_tree, subid_t *variable_oid,
|
|
guint variable_oid_length, ASN1_SCK *asn1, int offset, guint *lengthp,
|
|
gboolean unsafe)
|
|
{
|
|
const guchar *start;
|
|
guint length;
|
|
gboolean def;
|
|
guint vb_length;
|
|
gushort vb_type;
|
|
gchar *vb_type_name;
|
|
int ret;
|
|
guint cls, con, tag;
|
|
|
|
gint32 vb_integer_value;
|
|
guint32 vb_uinteger_value;
|
|
|
|
guint8 *vb_octet_string;
|
|
|
|
subid_t *vb_oid;
|
|
guint vb_oid_length;
|
|
|
|
gchar *vb_display_string;
|
|
|
|
#ifdef HAVE_SPRINT_VALUE
|
|
struct variable_list variable;
|
|
#if defined(HAVE_UCD_SNMP_SNMP_H)
|
|
long value;
|
|
#endif
|
|
#endif /* HAVE_SPRINT_VALUE */
|
|
int i;
|
|
gchar *buf;
|
|
int len;
|
|
|
|
/* parse the type of the object */
|
|
start = asn1->pointer;
|
|
ret = asn1_header_decode (asn1, &cls, &con, &tag, &def, &vb_length);
|
|
if (ret != ASN1_ERR_NOERROR)
|
|
return ret;
|
|
if (!def)
|
|
return ASN1_ERR_LENGTH_NOT_DEFINITE;
|
|
|
|
/* Convert the class, constructed flag, and tag to a type. */
|
|
vb_type_name = snmp_tag_cls2syntax(tag, cls, &vb_type);
|
|
if (vb_type_name == NULL) {
|
|
/*
|
|
* Unsupported type.
|
|
* Dissect the value as an opaque string of octets.
|
|
*/
|
|
vb_type_name = "unsupported type";
|
|
vb_type = SNMP_OPAQUE;
|
|
}
|
|
|
|
/* parse the value */
|
|
switch (vb_type) {
|
|
|
|
case SNMP_INTEGER:
|
|
ret = asn1_int32_value_decode(asn1, vb_length,
|
|
&vb_integer_value);
|
|
if (ret != ASN1_ERR_NOERROR)
|
|
return ret;
|
|
length = asn1->pointer - start;
|
|
if (snmp_tree) {
|
|
#ifdef HAVE_SPRINT_VALUE
|
|
if (!unsafe) {
|
|
#if defined(HAVE_UCD_SNMP_SNMP_H)
|
|
value = vb_integer_value;
|
|
variable.val.integer = &value;
|
|
#elif defined(HAVE_SNMP_SNMP_H)
|
|
variable.val.integer = &vb_integer_value;
|
|
#endif
|
|
vb_display_string = format_var(&variable,
|
|
variable_oid, variable_oid_length, vb_type,
|
|
vb_length);
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset,
|
|
length,
|
|
"Value: %s", vb_display_string);
|
|
g_free(vb_display_string);
|
|
break; /* we added formatted version to the tree */
|
|
}
|
|
#endif /* HAVE_SPRINT_VALUE */
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Value: %s: %d (%#x)", vb_type_name,
|
|
vb_integer_value, vb_integer_value);
|
|
}
|
|
break;
|
|
|
|
case SNMP_COUNTER:
|
|
case SNMP_GAUGE:
|
|
case SNMP_TIMETICKS:
|
|
ret = asn1_uint32_value_decode(asn1, vb_length,
|
|
&vb_uinteger_value);
|
|
if (ret != ASN1_ERR_NOERROR)
|
|
return ret;
|
|
length = asn1->pointer - start;
|
|
if (snmp_tree) {
|
|
#ifdef HAVE_SPRINT_VALUE
|
|
if (!unsafe) {
|
|
#if defined(HAVE_UCD_SNMP_SNMP_H)
|
|
value = vb_uinteger_value;
|
|
variable.val.integer = &value;
|
|
#elif defined(HAVE_SNMP_SNMP_H)
|
|
variable.val.integer = &vb_uinteger_value;
|
|
#endif
|
|
vb_display_string = format_var(&variable,
|
|
variable_oid, variable_oid_length, vb_type,
|
|
vb_length);
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset,
|
|
length,
|
|
"Value: %s", vb_display_string);
|
|
g_free(vb_display_string);
|
|
break; /* we added formatted version to the tree */
|
|
}
|
|
#endif /* HAVE_SPRINT_VALUE */
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Value: %s: %u (%#x)", vb_type_name,
|
|
vb_uinteger_value, vb_uinteger_value);
|
|
}
|
|
break;
|
|
|
|
case SNMP_OCTETSTR:
|
|
case SNMP_IPADDR:
|
|
case SNMP_OPAQUE:
|
|
case SNMP_NSAP:
|
|
case SNMP_BITSTR:
|
|
case SNMP_COUNTER64:
|
|
ret = asn1_string_value_decode (asn1, vb_length,
|
|
&vb_octet_string);
|
|
if (ret != ASN1_ERR_NOERROR)
|
|
return ret;
|
|
length = asn1->pointer - start;
|
|
if (snmp_tree) {
|
|
#ifdef HAVE_SPRINT_VALUE
|
|
if (!unsafe) {
|
|
variable.val.string = vb_octet_string;
|
|
vb_display_string = format_var(&variable,
|
|
variable_oid, variable_oid_length, vb_type,
|
|
vb_length);
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset,
|
|
length,
|
|
"Value: %s", vb_display_string);
|
|
g_free(vb_display_string);
|
|
break; /* we added formatted version to the tree */
|
|
}
|
|
#endif /* HAVE_SPRINT_VALUE */
|
|
/*
|
|
* If some characters are not printable, display
|
|
* the string as bytes.
|
|
*/
|
|
for (i = 0; i < vb_length; i++) {
|
|
if (!(isprint(vb_octet_string[i])
|
|
|| isspace(vb_octet_string[i])))
|
|
break;
|
|
}
|
|
if (i < vb_length) {
|
|
/*
|
|
* We stopped, due to a non-printable
|
|
* character, before we got to the end
|
|
* of the string.
|
|
*/
|
|
vb_display_string = g_malloc(4*vb_length);
|
|
buf = &vb_display_string[0];
|
|
len = sprintf(buf, "%03u", vb_octet_string[0]);
|
|
buf += len;
|
|
for (i = 1; i < vb_length; i++) {
|
|
len = sprintf(buf, ".%03u",
|
|
vb_octet_string[i]);
|
|
buf += len;
|
|
}
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Value: %s: %s", vb_type_name,
|
|
vb_display_string);
|
|
g_free(vb_display_string);
|
|
} else {
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Value: %s: %.*s", vb_type_name,
|
|
(int)vb_length, vb_octet_string);
|
|
}
|
|
}
|
|
g_free(vb_octet_string);
|
|
break;
|
|
|
|
case SNMP_NULL:
|
|
ret = asn1_null_decode (asn1, vb_length);
|
|
if (ret != ASN1_ERR_NOERROR)
|
|
return ret;
|
|
length = asn1->pointer - start;
|
|
if (snmp_tree) {
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Value: %s", vb_type_name);
|
|
}
|
|
break;
|
|
|
|
case SNMP_OBJECTID:
|
|
ret = asn1_oid_value_decode (asn1, vb_length, &vb_oid,
|
|
&vb_oid_length);
|
|
if (ret != ASN1_ERR_NOERROR)
|
|
return ret;
|
|
length = asn1->pointer - start;
|
|
if (snmp_tree) {
|
|
#ifdef HAVE_SPRINT_VALUE
|
|
if (!unsafe) {
|
|
variable.val.objid = vb_oid;
|
|
vb_display_string = format_var(&variable,
|
|
variable_oid, variable_oid_length, vb_type,
|
|
vb_length);
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset,
|
|
length,
|
|
"Value: %s", vb_display_string);
|
|
break; /* we added formatted version to the tree */
|
|
}
|
|
#endif /* HAVE_SPRINT_VALUE */
|
|
vb_display_string = format_oid(vb_oid, vb_oid_length);
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Value: %s: %s", vb_type_name, vb_display_string);
|
|
g_free(vb_display_string);
|
|
}
|
|
g_free(vb_oid);
|
|
break;
|
|
|
|
case SNMP_NOSUCHOBJECT:
|
|
length = asn1->pointer - start;
|
|
if (snmp_tree) {
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Value: %s: no such object", vb_type_name);
|
|
}
|
|
break;
|
|
|
|
case SNMP_NOSUCHINSTANCE:
|
|
length = asn1->pointer - start;
|
|
if (snmp_tree) {
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Value: %s: no such instance", vb_type_name);
|
|
}
|
|
break;
|
|
|
|
case SNMP_ENDOFMIBVIEW:
|
|
length = asn1->pointer - start;
|
|
if (snmp_tree) {
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Value: %s: end of mib view", vb_type_name);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
g_assert_not_reached();
|
|
return ASN1_ERR_WRONG_TYPE;
|
|
}
|
|
*lengthp = length;
|
|
return ASN1_ERR_NOERROR;
|
|
}
|
|
|
|
static void
|
|
dissect_common_pdu(const u_char *pd, int offset, frame_data *fd,
|
|
proto_tree *tree, ASN1_SCK asn1, guint pdu_type, const guchar *start)
|
|
{
|
|
gboolean def;
|
|
guint length;
|
|
guint sequence_length;
|
|
|
|
guint32 request_id;
|
|
|
|
guint32 error_status;
|
|
|
|
guint32 error_index;
|
|
|
|
char *pdu_type_string;
|
|
|
|
subid_t *enterprise;
|
|
guint enterprise_length;
|
|
|
|
guint8 *agent_address;
|
|
guint agent_address_length;
|
|
|
|
guint32 trap_type;
|
|
|
|
guint32 specific_type;
|
|
|
|
guint timestamp;
|
|
guint timestamp_length;
|
|
|
|
gchar *oid_string;
|
|
|
|
guint variable_bindings_length;
|
|
|
|
int vb_index;
|
|
guint variable_length;
|
|
subid_t *variable_oid;
|
|
guint variable_oid_length;
|
|
#if defined(HAVE_UCD_SNMP_SNMP_H) || defined(HAVE_SNMP_SNMP_H)
|
|
gchar vb_oid_string[MAX_STRING_LEN]; /* TBC */
|
|
#endif
|
|
gboolean unsafe;
|
|
|
|
int ret;
|
|
guint cls, con, tag;
|
|
|
|
pdu_type_string = val_to_str(pdu_type, pdu_types,
|
|
"Unknown PDU type %#x");
|
|
if (check_col(fd, COL_INFO))
|
|
col_add_str(fd, COL_INFO, pdu_type_string);
|
|
length = asn1.pointer - start;
|
|
if (tree) {
|
|
proto_tree_add_text(tree, NullTVB, offset, length,
|
|
"PDU type: %s", pdu_type_string);
|
|
}
|
|
offset += length;
|
|
|
|
/* get the fields in the PDU preceeding the variable-bindings sequence */
|
|
switch (pdu_type) {
|
|
|
|
case SNMP_MSG_GET:
|
|
case SNMP_MSG_GETNEXT:
|
|
case SNMP_MSG_RESPONSE:
|
|
case SNMP_MSG_SET:
|
|
case SNMP_MSG_GETBULK:
|
|
case SNMP_MSG_INFORM:
|
|
case SNMP_MSG_TRAP2:
|
|
case SNMP_MSG_REPORT:
|
|
/* request id */
|
|
ret = asn1_uint32_decode (&asn1, &request_id, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"request ID", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_text(tree, NullTVB, offset, length,
|
|
"Request Id: %#x", request_id);
|
|
}
|
|
offset += length;
|
|
|
|
/* error status, or getbulk non-repeaters */
|
|
ret = asn1_uint32_decode (&asn1, &error_status, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
(pdu_type == SNMP_MSG_GETBULK) ? "non-repeaters"
|
|
: "error status",
|
|
ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
if (pdu_type == SNMP_MSG_GETBULK) {
|
|
proto_tree_add_text(tree, NullTVB, offset,
|
|
length, "Non-repeaters: %u", error_status);
|
|
} else {
|
|
proto_tree_add_text(tree, NullTVB, offset,
|
|
length, "Error Status: %s",
|
|
val_to_str(error_status, error_statuses,
|
|
"Unknown (%d)"));
|
|
}
|
|
}
|
|
offset += length;
|
|
|
|
/* error index, or getbulk max-repetitions */
|
|
ret = asn1_uint32_decode (&asn1, &error_index, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
(pdu_type == SNMP_MSG_GETBULK) ? "max repetitions"
|
|
: "error index",
|
|
ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
if (pdu_type == SNMP_MSG_GETBULK) {
|
|
proto_tree_add_text(tree, NullTVB, offset,
|
|
length, "Max repetitions: %u", error_index);
|
|
} else {
|
|
proto_tree_add_text(tree, NullTVB, offset,
|
|
length, "Error Index: %u", error_index);
|
|
}
|
|
}
|
|
offset += length;
|
|
break;
|
|
|
|
case SNMP_MSG_TRAP:
|
|
/* enterprise */
|
|
ret = asn1_oid_decode (&asn1, &enterprise, &enterprise_length,
|
|
&length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"enterprise OID", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
oid_string = format_oid(enterprise, enterprise_length);
|
|
proto_tree_add_text(tree, NullTVB, offset, length,
|
|
"Enterprise: %s", oid_string);
|
|
g_free(oid_string);
|
|
}
|
|
g_free(enterprise);
|
|
offset += length;
|
|
|
|
/* agent address */
|
|
start = asn1.pointer;
|
|
ret = asn1_header_decode (&asn1, &cls, &con, &tag,
|
|
&def, &agent_address_length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"agent address", ret);
|
|
return;
|
|
}
|
|
if (!((cls == ASN1_APL && con == ASN1_PRI && tag == SNMP_IPA) ||
|
|
(cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_OTS))) {
|
|
/* GXSNMP 0.0.15 says the latter is "needed for
|
|
Banyan" */
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"agent_address", ASN1_ERR_WRONG_TYPE);
|
|
return;
|
|
}
|
|
if (agent_address_length != 4) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"agent_address", ASN1_ERR_WRONG_LENGTH_FOR_TYPE);
|
|
return;
|
|
}
|
|
ret = asn1_string_value_decode (&asn1,
|
|
agent_address_length, &agent_address);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"agent address", ret);
|
|
return;
|
|
}
|
|
length = asn1.pointer - start;
|
|
if (tree) {
|
|
proto_tree_add_text(tree, NullTVB, offset, length,
|
|
"Agent address: %s", ip_to_str(agent_address));
|
|
}
|
|
g_free(agent_address);
|
|
offset += length;
|
|
|
|
/* generic trap type */
|
|
ret = asn1_uint32_decode (&asn1, &trap_type, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"generic trap type", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_text(tree, NullTVB, offset, length,
|
|
"Trap type: %s",
|
|
val_to_str(trap_type, trap_types, "Unknown (%u)"));
|
|
}
|
|
offset += length;
|
|
|
|
/* specific trap type */
|
|
ret = asn1_uint32_decode (&asn1, &specific_type, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"specific trap type", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_text(tree, NullTVB, offset, length,
|
|
"Specific trap type: %u (%#x)",
|
|
specific_type, specific_type);
|
|
}
|
|
offset += length;
|
|
|
|
/* timestamp */
|
|
start = asn1.pointer;
|
|
ret = asn1_header_decode (&asn1, &cls, &con, &tag,
|
|
&def, ×tamp_length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"timestamp", ret);
|
|
return;
|
|
}
|
|
if (!((cls == ASN1_APL && con == ASN1_PRI && tag == SNMP_TIT) ||
|
|
(cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_INT))) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"timestamp", ASN1_ERR_WRONG_TYPE);
|
|
return;
|
|
}
|
|
ret = asn1_uint32_value_decode(&asn1, timestamp_length,
|
|
×tamp);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"timestamp", ret);
|
|
return;
|
|
}
|
|
length = asn1.pointer - start;
|
|
if (tree) {
|
|
proto_tree_add_text(tree, NullTVB, offset, length,
|
|
"Timestamp: %u", timestamp);
|
|
}
|
|
offset += length;
|
|
break;
|
|
}
|
|
|
|
/* variable bindings */
|
|
/* get header for variable-bindings sequence */
|
|
ret = asn1_sequence_decode(&asn1, &variable_bindings_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"variable bindings header", ret);
|
|
return;
|
|
}
|
|
offset += length;
|
|
|
|
/* loop on variable bindings */
|
|
vb_index = 0;
|
|
while (variable_bindings_length > 0) {
|
|
vb_index++;
|
|
sequence_length = 0;
|
|
|
|
/* parse type */
|
|
ret = asn1_sequence_decode(&asn1, &variable_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"variable binding header", ret);
|
|
return;
|
|
}
|
|
sequence_length += length;
|
|
|
|
/* parse object identifier */
|
|
ret = asn1_oid_decode (&asn1, &variable_oid,
|
|
&variable_oid_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"variable binding OID", ret);
|
|
return;
|
|
}
|
|
sequence_length += length;
|
|
|
|
unsafe = FALSE;
|
|
if (tree) {
|
|
oid_string = format_oid(variable_oid,
|
|
variable_oid_length);
|
|
|
|
#if defined(HAVE_UCD_SNMP_SNMP_H) || defined(HAVE_SNMP_SNMP_H)
|
|
sprint_objid(vb_oid_string, variable_oid,
|
|
variable_oid_length);
|
|
proto_tree_add_text(tree, NullTVB, offset, sequence_length,
|
|
"Object identifier %d: %s (%s)", vb_index,
|
|
oid_string, vb_oid_string);
|
|
#ifdef HAVE_SNMP_SNMP_H
|
|
/*
|
|
* CMU SNMP has a bug wherein "sprint_value()"
|
|
* calls "get_symbol()", passing it the
|
|
* OID supplied, to get an information about the
|
|
* variable, and blithely assumes that it will
|
|
* never get a null pointer back and dereferences
|
|
* the resulting pointer.
|
|
*
|
|
* Not true. If there's nothing in the MIB
|
|
* about *any* of the components of the OID,
|
|
* it'll return a null pointer.
|
|
*
|
|
* So we have to check for that, and pass
|
|
* down to "snmp_variable_decode" a flag
|
|
* saying "don't pass this to 'sprint_value()'.
|
|
*
|
|
* We check for that by looking for a decoded
|
|
* OID string beginning with "." followed by a
|
|
* digit, meaning it couldn't even find any
|
|
* symbolic representation for the very
|
|
* beginning of the OID string.
|
|
*/
|
|
if (vb_oid_string[0] == '.' &&
|
|
isdigit((guchar)vb_oid_string[1]))
|
|
unsafe = TRUE;
|
|
#endif /* HAVE_SNMP_SNMP_H */
|
|
#else /* defined(HAVE_UCD_SNMP_SNMP_H) || defined(HAVE_SNMP_SNMP_H) */
|
|
proto_tree_add_text(tree, NullTVB, offset, sequence_length,
|
|
"Object identifier %d: %s", vb_index,
|
|
oid_string);
|
|
#endif /* defined(HAVE_UCD_SNMP_SNMP_H) || defined(HAVE_SNMP_SNMP_H) */
|
|
g_free(oid_string);
|
|
}
|
|
offset += sequence_length;
|
|
variable_bindings_length -= sequence_length;
|
|
|
|
/* Parse the variable's value */
|
|
ret = snmp_variable_decode(tree, variable_oid,
|
|
variable_oid_length, &asn1, offset, &length,
|
|
unsafe);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"variable", ret);
|
|
return;
|
|
}
|
|
offset += length;
|
|
variable_bindings_length -= length;
|
|
}
|
|
}
|
|
|
|
static const value_string qos_vals[] = {
|
|
{ 0x0, "No authentication or privacy" },
|
|
{ 0x1, "Authentication, no privacy" },
|
|
{ 0x2, "Authentication and privacy" },
|
|
{ 0x3, "Authentication and privacy" },
|
|
{ 0, NULL },
|
|
};
|
|
|
|
static void
|
|
dissect_snmp2u_parameters(proto_tree *tree, int offset, int length,
|
|
guchar *parameters, int parameters_length)
|
|
{
|
|
proto_item *item;
|
|
proto_tree *parameters_tree;
|
|
proto_tree *qos_tree;
|
|
guint8 model;
|
|
guint8 qos;
|
|
guint8 len;
|
|
|
|
item = proto_tree_add_text(tree, NullTVB, offset, length,
|
|
"Parameters");
|
|
parameters_tree = proto_item_add_subtree(item, ett_parameters);
|
|
offset += length - parameters_length;
|
|
|
|
if (parameters_length < 1)
|
|
return;
|
|
model = *parameters;
|
|
proto_tree_add_text(parameters_tree, NullTVB, offset, 1,
|
|
"model: %u", model);
|
|
offset += 1;
|
|
parameters += 1;
|
|
parameters_length -= 1;
|
|
if (model != 1) {
|
|
/* Unknown model. */
|
|
proto_tree_add_text(parameters_tree, NullTVB, offset,
|
|
parameters_length, "parameters: %s",
|
|
bytes_to_str(parameters, parameters_length));
|
|
return;
|
|
}
|
|
|
|
if (parameters_length < 1)
|
|
return;
|
|
qos = *parameters;
|
|
item = proto_tree_add_text(parameters_tree, NullTVB, offset, 1,
|
|
"qoS: 0x%x", qos);
|
|
qos_tree = proto_item_add_subtree(item, ett_parameters_qos);
|
|
proto_tree_add_text(qos_tree, NullTVB, offset, 1, "%s",
|
|
decode_boolean_bitfield(qos, 0x04,
|
|
8, "Generation of report PDU allowed",
|
|
"Generation of report PDU not allowed"));
|
|
proto_tree_add_text(qos_tree, NullTVB, offset, 1, "%s",
|
|
decode_enumerated_bitfield(qos, 0x03,
|
|
8, qos_vals, "%s"));
|
|
offset += 1;
|
|
parameters += 1;
|
|
parameters_length -= 1;
|
|
|
|
if (parameters_length < 12)
|
|
return;
|
|
proto_tree_add_text(parameters_tree, NullTVB, offset, 12,
|
|
"agentID: %s", bytes_to_str(parameters, 12));
|
|
offset += 12;
|
|
parameters += 12;
|
|
parameters_length -= 12;
|
|
|
|
if (parameters_length < 4)
|
|
return;
|
|
proto_tree_add_text(parameters_tree, NullTVB, offset, 4,
|
|
"agentBoots: %u", pntohl(parameters));
|
|
offset += 4;
|
|
parameters += 4;
|
|
parameters_length -= 4;
|
|
|
|
if (parameters_length < 4)
|
|
return;
|
|
proto_tree_add_text(parameters_tree, NullTVB, offset, 4,
|
|
"agentTime: %u", pntohl(parameters));
|
|
offset += 4;
|
|
parameters += 4;
|
|
parameters_length -= 4;
|
|
|
|
if (parameters_length < 2)
|
|
return;
|
|
proto_tree_add_text(parameters_tree, NullTVB, offset, 2,
|
|
"maxSize: %u", pntohs(parameters));
|
|
offset += 2;
|
|
parameters += 2;
|
|
parameters_length -= 2;
|
|
|
|
if (parameters_length < 1)
|
|
return;
|
|
len = *parameters;
|
|
proto_tree_add_text(parameters_tree, NullTVB, offset, 1,
|
|
"userLen: %u", len);
|
|
offset += 1;
|
|
parameters += 1;
|
|
parameters_length -= 1;
|
|
|
|
if (parameters_length < len)
|
|
return;
|
|
proto_tree_add_text(parameters_tree, NullTVB, offset, len,
|
|
"userName: %.*s", len, parameters);
|
|
offset += len;
|
|
parameters += len;
|
|
parameters_length -= len;
|
|
|
|
if (parameters_length < 1)
|
|
return;
|
|
len = *parameters;
|
|
proto_tree_add_text(parameters_tree, NullTVB, offset, 1,
|
|
"authLen: %u", len);
|
|
offset += 1;
|
|
parameters += 1;
|
|
parameters_length -= 1;
|
|
|
|
if (parameters_length < len)
|
|
return;
|
|
proto_tree_add_text(parameters_tree, NullTVB, offset, len,
|
|
"authDigest: %s", bytes_to_str(parameters, len));
|
|
offset += len;
|
|
parameters += len;
|
|
parameters_length -= len;
|
|
|
|
if (parameters_length < 1)
|
|
return;
|
|
proto_tree_add_text(parameters_tree, NullTVB, offset, parameters_length,
|
|
"contextSelector: %s", bytes_to_str(parameters, parameters_length));
|
|
}
|
|
|
|
void
|
|
dissect_snmp_pdu(const u_char *pd, int offset, frame_data *fd,
|
|
proto_tree *tree, char *proto_name, int proto, gint ett)
|
|
{
|
|
ASN1_SCK asn1;
|
|
const guchar *start;
|
|
gboolean def;
|
|
gboolean encrypted;
|
|
guint length;
|
|
guint message_length;
|
|
guint global_length;
|
|
|
|
guint32 version;
|
|
guint32 msgid;
|
|
guint32 msgmax;
|
|
guint32 msgsec;
|
|
guint32 engineboots;
|
|
guint32 enginetime;
|
|
|
|
guchar *msgflags;
|
|
guchar *community;
|
|
guchar *secparm;
|
|
guchar *cengineid;
|
|
guchar *cname;
|
|
guchar *cryptpdu;
|
|
guchar *aengineid;
|
|
guchar *username;
|
|
guchar *authpar;
|
|
guchar *privpar;
|
|
int msgflags_length;
|
|
int community_length;
|
|
int secparm_length;
|
|
int cengineid_length;
|
|
int cname_length;
|
|
int cryptpdu_length;
|
|
int aengineid_length;
|
|
int username_length;
|
|
int authpar_length;
|
|
int privpar_length;
|
|
|
|
guint pdu_type;
|
|
guint pdu_length;
|
|
|
|
proto_tree *snmp_tree = NULL;
|
|
proto_tree *global_tree = NULL;
|
|
proto_tree *flags_tree = NULL;
|
|
proto_tree *secur_tree = NULL;
|
|
proto_item *item = NULL;
|
|
int ret;
|
|
guint cls, con, tag;
|
|
|
|
if (check_col(fd, COL_PROTOCOL))
|
|
col_add_str(fd, COL_PROTOCOL, proto_name);
|
|
|
|
if (tree) {
|
|
item = proto_tree_add_item(tree, proto, NullTVB, offset,
|
|
END_OF_FRAME, FALSE);
|
|
snmp_tree = proto_item_add_subtree(item, ett);
|
|
}
|
|
|
|
/* NOTE: we have to parse the message piece by piece, since the
|
|
* capture length may be less than the message length: a 'global'
|
|
* parsing is likely to fail.
|
|
*/
|
|
/* parse the SNMP header */
|
|
asn1_open(&asn1, &pd[offset], END_OF_FRAME);
|
|
ret = asn1_sequence_decode(&asn1, &message_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"message header", ret);
|
|
return;
|
|
}
|
|
offset += length;
|
|
|
|
ret = asn1_uint32_decode (&asn1, &version, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree, "version number",
|
|
ret);
|
|
return;
|
|
}
|
|
if (snmp_tree) {
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Version: %s",
|
|
val_to_str(version, versions, "Unknown version %#x"));
|
|
}
|
|
offset += length;
|
|
|
|
|
|
switch (version) {
|
|
case SNMP_VERSION_1:
|
|
case SNMP_VERSION_2c:
|
|
ret = asn1_octet_string_decode (&asn1, &community,
|
|
&community_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"community", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Community: %.*s", community_length,
|
|
SAFE_STRING(community));
|
|
}
|
|
g_free(community);
|
|
offset += length;
|
|
break;
|
|
case SNMP_VERSION_2u:
|
|
ret = asn1_octet_string_decode (&asn1, &community,
|
|
&community_length, &length);
|
|
if (tree) {
|
|
dissect_snmp2u_parameters(snmp_tree, offset, length,
|
|
community, community_length);
|
|
}
|
|
g_free(community);
|
|
offset += length;
|
|
break;
|
|
case SNMP_VERSION_3:
|
|
ret = asn1_sequence_decode(&asn1, &global_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"message global header", ret);
|
|
return;
|
|
}
|
|
if (snmp_tree) {
|
|
item = proto_tree_add_text(snmp_tree, NullTVB, offset,
|
|
global_length + length, "Message Global Header");
|
|
global_tree = proto_item_add_subtree(item, ett_global);
|
|
proto_tree_add_text(global_tree, NullTVB, offset,
|
|
length,
|
|
"Message Global Header Length: %d", global_length);
|
|
}
|
|
offset += length;
|
|
ret = asn1_uint32_decode (&asn1, &msgid, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"message id", ret);
|
|
return;
|
|
}
|
|
if (global_tree) {
|
|
proto_tree_add_text(global_tree, NullTVB, offset,
|
|
length, "Message ID: %d", msgid);
|
|
}
|
|
offset += length;
|
|
ret = asn1_uint32_decode (&asn1, &msgmax, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"message max size", ret);
|
|
return;
|
|
}
|
|
if (global_tree) {
|
|
proto_tree_add_text(global_tree, NullTVB, offset,
|
|
length, "Message Max Size: %d", msgmax);
|
|
}
|
|
offset += length;
|
|
ret = asn1_octet_string_decode (&asn1, &msgflags,
|
|
&msgflags_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"message flags", ret);
|
|
return;
|
|
}
|
|
if (msgflags_length != 1) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"message flags wrong length", ret);
|
|
g_free(msgflags);
|
|
return;
|
|
}
|
|
if (global_tree) {
|
|
item = proto_tree_add_uint_format(global_tree,
|
|
hf_snmpv3_flags, NullTVB, offset, length,
|
|
msgflags[0], "Flags: 0x%02x", msgflags[0]);
|
|
flags_tree = proto_item_add_subtree(item, ett_flags);
|
|
proto_tree_add_boolean(flags_tree, hf_snmpv3_flags_report,
|
|
NullTVB, offset, length, msgflags[0]);
|
|
proto_tree_add_boolean(flags_tree, hf_snmpv3_flags_crypt,
|
|
NullTVB, offset, length, msgflags[0]);
|
|
proto_tree_add_boolean(flags_tree, hf_snmpv3_flags_auth,
|
|
NullTVB, offset, length, msgflags[0]);
|
|
}
|
|
encrypted = msgflags[0] & TH_CRYPT;
|
|
g_free(msgflags);
|
|
offset += length;
|
|
ret = asn1_uint32_decode (&asn1, &msgsec, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"message security model", ret);
|
|
return;
|
|
}
|
|
if (global_tree) {
|
|
proto_tree_add_text(global_tree, NullTVB, offset,
|
|
length, "Message Security Model: %s",
|
|
val_to_str(msgsec, sec_models,
|
|
"Unknown model %#x"));
|
|
}
|
|
offset += length;
|
|
switch(msgsec) {
|
|
case SNMP_SEC_USM:
|
|
start = asn1.pointer;
|
|
ret = asn1_header_decode (&asn1, &cls, &con, &tag,
|
|
&def, &secparm_length);
|
|
length = asn1.pointer - start;
|
|
if (cls != ASN1_UNI && con != ASN1_PRI &&
|
|
tag != ASN1_OTS) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"Message Security Parameters",
|
|
ASN1_ERR_WRONG_TYPE);
|
|
return;
|
|
}
|
|
if (snmp_tree) {
|
|
item = proto_tree_add_text(snmp_tree, NullTVB,
|
|
offset, secparm_length + length,
|
|
"Message Security Parameters");
|
|
secur_tree = proto_item_add_subtree(item,
|
|
ett_secur);
|
|
proto_tree_add_text(secur_tree, NullTVB, offset,
|
|
length,
|
|
"Message Security Parameters Length: %d",
|
|
secparm_length);
|
|
}
|
|
offset += length;
|
|
ret = asn1_sequence_decode(&asn1, &secparm_length,
|
|
&length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"USM sequence header", ret);
|
|
return;
|
|
}
|
|
offset += length;
|
|
ret = asn1_octet_string_decode (&asn1, &aengineid,
|
|
&aengineid_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"authoritative engine id", ret);
|
|
return;
|
|
}
|
|
if (secur_tree) {
|
|
proto_tree_add_text(secur_tree, NullTVB, offset,
|
|
length, "Authoritative Engine ID: %s",
|
|
bytes_to_str(aengineid, aengineid_length));
|
|
}
|
|
g_free(aengineid);
|
|
offset += length;
|
|
ret = asn1_uint32_decode (&asn1, &engineboots, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"engine boots", ret);
|
|
return;
|
|
}
|
|
if (secur_tree) {
|
|
proto_tree_add_text(secur_tree, NullTVB,
|
|
offset, length, "Engine Boots: %d",
|
|
engineboots);
|
|
}
|
|
offset += length;
|
|
ret = asn1_uint32_decode (&asn1, &enginetime, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"engine time", ret);
|
|
return;
|
|
}
|
|
if (secur_tree) {
|
|
proto_tree_add_text(secur_tree, NullTVB,
|
|
offset, length, "Engine Time: %d",
|
|
enginetime);
|
|
}
|
|
offset += length;
|
|
ret = asn1_octet_string_decode (&asn1, &username,
|
|
&username_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"user name", ret);
|
|
return;
|
|
}
|
|
if (secur_tree) {
|
|
proto_tree_add_text(secur_tree, NullTVB, offset,
|
|
length, "User Name: %.*s",
|
|
username_length,
|
|
SAFE_STRING(username));
|
|
}
|
|
g_free(username);
|
|
offset += length;
|
|
ret = asn1_octet_string_decode (&asn1, &authpar,
|
|
&authpar_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"authentication parameter", ret);
|
|
return;
|
|
}
|
|
if (secur_tree) {
|
|
proto_tree_add_text(secur_tree, NullTVB, offset,
|
|
length, "Authentication Parameter: %s",
|
|
bytes_to_str(authpar, authpar_length));
|
|
}
|
|
g_free(authpar);
|
|
offset += length;
|
|
ret = asn1_octet_string_decode (&asn1, &privpar,
|
|
&privpar_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"privacy parameter", ret);
|
|
return;
|
|
}
|
|
if (secur_tree) {
|
|
proto_tree_add_text(secur_tree, NullTVB, offset,
|
|
length, "Privacy Parameter: %s",
|
|
bytes_to_str(privpar, privpar_length));
|
|
}
|
|
g_free(privpar);
|
|
offset += length;
|
|
break;
|
|
default:
|
|
ret = asn1_octet_string_decode (&asn1,
|
|
&secparm, &secparm_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"Message Security Parameters", ret);
|
|
return;
|
|
}
|
|
if (snmp_tree) {
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset,
|
|
length,
|
|
"Message Security Parameters Data"
|
|
" (%d bytes)", secparm_length);
|
|
}
|
|
g_free(secparm);
|
|
offset += length;
|
|
break;
|
|
}
|
|
/* PDU starts here */
|
|
if (encrypted) {
|
|
ret = asn1_octet_string_decode (&asn1, &cryptpdu,
|
|
&cryptpdu_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"encrypted PDU header", ret);
|
|
return;
|
|
}
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Encrypted PDU (%d bytes)", length);
|
|
g_free(cryptpdu);
|
|
if (check_col(fd, COL_INFO))
|
|
col_set_str(fd, COL_INFO, "Encrypted PDU");
|
|
return;
|
|
}
|
|
ret = asn1_sequence_decode(&asn1, &global_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"PDU header", ret);
|
|
return;
|
|
}
|
|
offset += length;
|
|
ret = asn1_octet_string_decode (&asn1, &cengineid,
|
|
&cengineid_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"context engine id", ret);
|
|
return;
|
|
}
|
|
if (snmp_tree) {
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Context Engine ID: %s",
|
|
bytes_to_str(cengineid, cengineid_length));
|
|
}
|
|
g_free(cengineid);
|
|
offset += length;
|
|
ret = asn1_octet_string_decode (&asn1, &cname,
|
|
&cname_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"context name", ret);
|
|
return;
|
|
}
|
|
if (snmp_tree) {
|
|
proto_tree_add_text(snmp_tree, NullTVB, offset, length,
|
|
"Context Name: %.*s", cname_length,
|
|
SAFE_STRING(cname));
|
|
}
|
|
g_free(cname);
|
|
offset += length;
|
|
break;
|
|
default:
|
|
dissect_snmp_error(pd, offset, fd, tree,
|
|
"PDU for unknown version of SNMP");
|
|
return;
|
|
}
|
|
|
|
start = asn1.pointer;
|
|
ret = asn1_header_decode (&asn1, &cls, &con, &pdu_type, &def,
|
|
&pdu_length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"PDU type", ret);
|
|
return;
|
|
}
|
|
if (cls != ASN1_CTX || con != ASN1_CON) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"PDU type", ASN1_ERR_WRONG_TYPE);
|
|
return;
|
|
}
|
|
dissect_common_pdu(pd, offset, fd, snmp_tree, asn1, pdu_type, start);
|
|
}
|
|
|
|
static void
|
|
dissect_smux_pdu(const u_char *pd, int offset, frame_data *fd,
|
|
proto_tree *tree, int proto, gint ett)
|
|
{
|
|
ASN1_SCK asn1;
|
|
const guchar *start;
|
|
gboolean def;
|
|
guint length;
|
|
|
|
guint pdu_type;
|
|
char *pdu_type_string;
|
|
guint pdu_length;
|
|
|
|
guint32 version;
|
|
guint32 cause;
|
|
guint32 priority;
|
|
guint32 operation;
|
|
guint32 commit;
|
|
|
|
guchar *password;
|
|
int password_length;
|
|
|
|
guchar *application;
|
|
int application_length;
|
|
|
|
subid_t *regid;
|
|
guint regid_length;
|
|
|
|
gchar *oid_string;
|
|
|
|
proto_tree *smux_tree = NULL;
|
|
proto_item *item = NULL;
|
|
int ret;
|
|
guint cls, con;
|
|
|
|
if (check_col(fd, COL_PROTOCOL))
|
|
col_set_str(fd, COL_PROTOCOL, "SMUX");
|
|
|
|
if (tree) {
|
|
item = proto_tree_add_item(tree, proto, NullTVB, offset,
|
|
END_OF_FRAME, FALSE);
|
|
smux_tree = proto_item_add_subtree(item, ett);
|
|
}
|
|
|
|
/* NOTE: we have to parse the message piece by piece, since the
|
|
* capture length may be less than the message length: a 'global'
|
|
* parsing is likely to fail.
|
|
*/
|
|
/* parse the SNMP header */
|
|
asn1_open(&asn1, &pd[offset], END_OF_FRAME);
|
|
start = asn1.pointer;
|
|
ret = asn1_header_decode (&asn1, &cls, &con, &pdu_type, &def,
|
|
&pdu_length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"PDU type", ret);
|
|
return;
|
|
}
|
|
|
|
/* Dissect SMUX here */
|
|
if (cls == ASN1_APL && con == ASN1_CON && pdu_type == SMUX_MSG_OPEN) {
|
|
pdu_type_string = val_to_str(pdu_type, smux_types,
|
|
"Unknown PDU type %#x");
|
|
if (check_col(fd, COL_INFO))
|
|
col_add_str(fd, COL_INFO, pdu_type_string);
|
|
length = asn1.pointer - start;
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset, length,
|
|
"PDU type: %s", pdu_type_string);
|
|
}
|
|
offset += length;
|
|
ret = asn1_uint32_decode (&asn1, &version, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"version", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset, length,
|
|
"Version: %d", version);
|
|
}
|
|
offset += length;
|
|
|
|
ret = asn1_oid_decode (&asn1, ®id, ®id_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"registration OID", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
oid_string = format_oid(regid, regid_length);
|
|
proto_tree_add_text(smux_tree, NullTVB, offset, length,
|
|
"Registration: %s", oid_string);
|
|
g_free(oid_string);
|
|
}
|
|
g_free(regid);
|
|
offset += length;
|
|
|
|
ret = asn1_octet_string_decode (&asn1, &application,
|
|
&application_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"application", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset, length,
|
|
"Application: %.*s", application_length,
|
|
SAFE_STRING(application));
|
|
}
|
|
g_free(application);
|
|
offset += length;
|
|
|
|
ret = asn1_octet_string_decode (&asn1, &password,
|
|
&password_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"password", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset, length,
|
|
"Password: %.*s", password_length,
|
|
SAFE_STRING(password));
|
|
}
|
|
g_free(password);
|
|
offset += length;
|
|
return;
|
|
}
|
|
if (cls == ASN1_APL && con == ASN1_PRI && pdu_type == SMUX_MSG_CLOSE) {
|
|
pdu_type_string = val_to_str(pdu_type, smux_types,
|
|
"Unknown PDU type %#x");
|
|
if (check_col(fd, COL_INFO))
|
|
col_add_str(fd, COL_INFO, pdu_type_string);
|
|
length = asn1.pointer - start;
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset, length,
|
|
"PDU type: %s", pdu_type_string);
|
|
}
|
|
offset += length;
|
|
ret = asn1_uint32_value_decode (&asn1, pdu_length, &cause);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"cause", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset,
|
|
pdu_length, "Cause: %s",
|
|
val_to_str(cause, smux_close,
|
|
"Unknown cause %#x"));
|
|
}
|
|
offset += pdu_length;
|
|
return;
|
|
}
|
|
if (cls == ASN1_APL && con == ASN1_CON && pdu_type == SMUX_MSG_RREQ) {
|
|
pdu_type_string = val_to_str(pdu_type, smux_types,
|
|
"Unknown PDU type %#x");
|
|
if (check_col(fd, COL_INFO))
|
|
col_add_str(fd, COL_INFO, pdu_type_string);
|
|
length = asn1.pointer - start;
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset, length,
|
|
"PDU type: %s", pdu_type_string);
|
|
}
|
|
offset += length;
|
|
ret = asn1_oid_decode (&asn1, ®id, ®id_length, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"registration subtree", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
oid_string = format_oid(regid, regid_length);
|
|
proto_tree_add_text(smux_tree, NullTVB, offset, length,
|
|
"Registration: %s", oid_string);
|
|
g_free(oid_string);
|
|
}
|
|
g_free(regid);
|
|
offset += length;
|
|
|
|
ret = asn1_uint32_decode (&asn1, &priority, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"priority", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset, length,
|
|
"Priority: %d", priority);
|
|
}
|
|
offset += length;
|
|
|
|
ret = asn1_uint32_decode (&asn1, &operation, &length);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"operation", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset, length,
|
|
"Operation: %s",
|
|
val_to_str(operation, smux_rreq,
|
|
"Unknown operation %#x"));
|
|
}
|
|
offset += length;
|
|
return;
|
|
}
|
|
if (cls == ASN1_APL && con == ASN1_PRI && pdu_type == SMUX_MSG_RRSP) {
|
|
pdu_type_string = val_to_str(pdu_type, smux_types,
|
|
"Unknown PDU type %#x");
|
|
if (check_col(fd, COL_INFO))
|
|
col_add_str(fd, COL_INFO, pdu_type_string);
|
|
length = asn1.pointer - start;
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset, length,
|
|
"PDU type: %s", pdu_type_string);
|
|
}
|
|
offset += length;
|
|
ret = asn1_uint32_value_decode (&asn1, pdu_length, &priority);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"priority", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset,
|
|
pdu_length, "%s",
|
|
val_to_str(priority, smux_prio,
|
|
"Priority: %#x"));
|
|
}
|
|
offset += pdu_length;
|
|
return;
|
|
}
|
|
if (cls == ASN1_APL && con == ASN1_PRI && pdu_type == SMUX_MSG_SOUT) {
|
|
pdu_type_string = val_to_str(pdu_type, smux_types,
|
|
"Unknown PDU type %#x");
|
|
if (check_col(fd, COL_INFO))
|
|
col_add_str(fd, COL_INFO, pdu_type_string);
|
|
length = asn1.pointer - start;
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset, length,
|
|
"PDU type: %s", pdu_type_string);
|
|
}
|
|
offset += length;
|
|
ret = asn1_uint32_value_decode (&asn1, pdu_length, &commit);
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"commit", ret);
|
|
return;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_text(smux_tree, NullTVB, offset,
|
|
pdu_length, "%s",
|
|
val_to_str(commit, smux_sout,
|
|
"Unknown SOUT Value: %#x"));
|
|
}
|
|
offset += pdu_length;
|
|
return;
|
|
}
|
|
if (cls != ASN1_CTX || con != ASN1_CON) {
|
|
dissect_snmp_parse_error(pd, offset, fd, tree,
|
|
"PDU type", ASN1_ERR_WRONG_TYPE);
|
|
return;
|
|
}
|
|
dissect_common_pdu(pd, offset, fd, smux_tree, asn1, pdu_type, start);
|
|
}
|
|
|
|
static void
|
|
dissect_snmp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
|
|
{
|
|
conversation_t *conversation;
|
|
|
|
OLD_CHECK_DISPLAY_AS_DATA(proto_snmp, pd, offset, fd, tree);
|
|
|
|
/*
|
|
* The first SNMP packet goes to the SNMP port; the second one
|
|
* may come from some *other* port, but goes back to the same
|
|
* IP address and port as the ones from which the first packet
|
|
* came; all subsequent packets presumably go between those two
|
|
* IP addresses and ports.
|
|
*
|
|
* If this packet went to the SNMP port, we check to see if
|
|
* there's already a conversation with the source IP address
|
|
* and port of this packet, the destination IP address of this
|
|
* packet, and any destination UDP port. If not, we create
|
|
* one, with a wildcard UDP port, and give it the SNMP dissector
|
|
* as a dissector.
|
|
*/
|
|
if (pi.destport == UDP_PORT_SNMP) {
|
|
conversation = find_conversation(&pi.src, &pi.dst, PT_UDP,
|
|
pi.srcport, 0, NO_DST_PORT);
|
|
if (conversation == NULL) {
|
|
conversation = conversation_new(&pi.src, &pi.dst, PT_UDP,
|
|
pi.srcport, 0, NULL,
|
|
NO_DST_PORT);
|
|
old_conversation_set_dissector(conversation, dissect_snmp);
|
|
}
|
|
}
|
|
|
|
dissect_snmp_pdu(pd, offset, fd, tree, "SNMP", proto_snmp, ett_snmp);
|
|
}
|
|
|
|
static void
|
|
dissect_smux(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
|
|
{
|
|
OLD_CHECK_DISPLAY_AS_DATA(proto_smux, pd, offset, fd, tree);
|
|
dissect_smux_pdu(pd, offset, fd, tree, proto_smux, ett_smux);
|
|
}
|
|
|
|
void
|
|
proto_register_snmp(void)
|
|
{
|
|
#ifdef linux
|
|
void *libsnmp_handle;
|
|
int (*snmp_set_suffix_only_p)(int);
|
|
int (*ds_set_int_p)(int, int, int);
|
|
#endif
|
|
|
|
static hf_register_info hf[] = {
|
|
{ &hf_snmpv3_flags,
|
|
{ "SNMPv3 Flags", "snmpv3.flags", FT_UINT8, BASE_HEX, NULL,
|
|
0x0, "" }},
|
|
{ &hf_snmpv3_flags_auth,
|
|
{ "Authenticated", "snmpv3.flags.auth", FT_BOOLEAN, 8,
|
|
TFS(&flags_set_truth), TH_AUTH, "" }},
|
|
{ &hf_snmpv3_flags_crypt,
|
|
{ "Encrypted", "snmpv3.flags.crypt", FT_BOOLEAN, 8,
|
|
TFS(&flags_set_truth), TH_CRYPT, "" }},
|
|
{ &hf_snmpv3_flags_report,
|
|
{ "Reportable", "snmpv3.flags.report", FT_BOOLEAN, 8,
|
|
TFS(&flags_set_truth), TH_REPORT, "" }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_snmp,
|
|
&ett_smux,
|
|
&ett_parameters,
|
|
&ett_parameters_qos,
|
|
&ett_global,
|
|
&ett_flags,
|
|
&ett_secur,
|
|
};
|
|
|
|
#if defined(HAVE_UCD_SNMP_SNMP_H) || defined(HAVE_SNMP_SNMP_H)
|
|
/* UCD or CMU SNMP */
|
|
init_mib();
|
|
#ifdef HAVE_UCD_SNMP_SNMP_H
|
|
#ifdef linux
|
|
/* As per the comment near the beginning of the file, UCD SNMP 4.1.1
|
|
changed "snmp_set_suffix_only()" from a function to a macro,
|
|
removing "snmp_set_suffix_only()" from the library; this means
|
|
that binaries that call "snmp_set_suffix_only()" and
|
|
that are linked against shared libraries from earlier versions
|
|
of the UCD SNMP library won't run with shared libraries from
|
|
4.1.1.
|
|
|
|
This is a problem on Red Hat Linux, as pre-6.2 releases
|
|
came with pre-4.1.1 UCD SNMP, while 6.2 comes the 4.1.1.
|
|
Versions of Ethereal built on pre-6.2 releases don't run
|
|
on 6.2, and the current Ethereal RPMs are built on pre-6.2
|
|
releases, causing problems when users running 6.2 download
|
|
them and try to use them.
|
|
|
|
Building the releases on 6.2 isn't necessarily the answer,
|
|
as "snmp_set_suffix_only()" expands to a call to "ds_set_int()"
|
|
with a second argument not supported by at least some pre-4.1.1
|
|
versions of the library - it appears that the 4.0.1 library,
|
|
at least, checks for invalid arguments and returns an error
|
|
rather than stomping random memory, but that means that you
|
|
won't get get OIDs displayed as module-name::sub-OID.
|
|
|
|
So we use a trick similar to one I've seen mentioned as
|
|
used in Windows applications to let you build binaries
|
|
that run on many different versions of Windows 9x and
|
|
Windows NT, that use features present on later versions
|
|
if run on those later versions, but that avoid calling,
|
|
when run on older versions, routines not present on those
|
|
older versions.
|
|
|
|
I.e., we load "libsnmp.so.0" with "dlopen()", and call
|
|
"dlsym()" to try to find "snmp_set_suffix_only()"; if we
|
|
don't find it, we make the appropriate call to
|
|
"ds_set_int()" instead. (We load "libsnmp.so.0" rather
|
|
than "libsnmp.so" because, at least on RH 6.2, "libsnmp.so"
|
|
exists only if you've loaded the libsnmp development package,
|
|
which makes "libsnmp.so" a symlink to "libsnmp.so.0"; we
|
|
don't want to force users to install it or to make said
|
|
symlink by hand.)
|
|
|
|
We do this only on Linux, for now, as we've only seen the
|
|
problem on Red Hat; it may show up on other OSes that bundle
|
|
UCD SNMP, or on OSes where it's not bundled but for which
|
|
binary packages are built that link against a shared version
|
|
of the UCD SNMP library. If we run into one of those, we
|
|
can do this under those OSes as well, *if* "dlopen()" makes
|
|
the run-time linker use the same search rules as it uses when
|
|
loading libraries with which the application is linked.
|
|
|
|
(Perhaps we could use the GLib wrappers for run-time linking,
|
|
*if* they're thin enough; however, as this code is currently
|
|
used only on Linux, we don't worry about that for now.) */
|
|
|
|
libsnmp_handle = dlopen("libsnmp.so.0", RTLD_LAZY|RTLD_GLOBAL);
|
|
if (libsnmp_handle == NULL) {
|
|
/* We didn't find "libsnmp.so.0".
|
|
|
|
This could mean that there is no SNMP shared library
|
|
on this system, in which case we were linked statically,
|
|
in which case whatever call the following line of code
|
|
makes will presumably work, as we have the routine it
|
|
calls wired into our binary. (If we were linked
|
|
dynamically with "-lsnmp", we would have failed to
|
|
start.)
|
|
|
|
It could also mean that there is an SNMP shared library
|
|
on this system, but it's called something other than
|
|
"libsnmp.so.0"; so far, we've seen the problem we're
|
|
working around only on systems where the SNMP shared
|
|
library is called "libsnmp.so.0", so we assume for now
|
|
that systems with shared SNMP libraries named something
|
|
other than "libsnmp.so.0" have an SNMP library that's
|
|
not 4.1.1. */
|
|
snmp_set_suffix_only(2);
|
|
} else {
|
|
/* OK, we have it loaded. Do we have
|
|
"snmp_set_suffix_only()"? */
|
|
snmp_set_suffix_only_p = dlsym(libsnmp_handle,
|
|
"snmp_set_suffix_only");
|
|
if (snmp_set_suffix_only_p != NULL) {
|
|
/* Yes - call it. */
|
|
(*snmp_set_suffix_only_p)(2);
|
|
} else {
|
|
/* No; do we have "ds_set_int()"? */
|
|
ds_set_int_p = dlsym(libsnmp_handle, "ds_set_int");
|
|
if (ds_set_int_p != NULL) {
|
|
/* Yes - cal it with DS_LIBRARY_ID,
|
|
DS_LIB_PRINT_SUFFIX_ONLY, and 2 as
|
|
arguments.
|
|
|
|
We do *not* use DS_LIBRARY_ID or
|
|
DS_LIB_PRINT_SUFFIX_ONLY by name, so that
|
|
we don't require that Ethereal be built
|
|
with versions of UCD SNMP that include
|
|
that value; instead, we use their values
|
|
in UCD SNMP 4.1.1, which are 0 and 4,
|
|
respectively. */
|
|
(*ds_set_int_p)(0, 4, 2);
|
|
}
|
|
}
|
|
dlclose(libsnmp_handle);
|
|
}
|
|
#else /* linux */
|
|
snmp_set_suffix_only(2);
|
|
#endif /* linux */
|
|
#endif /* HAVE_UCD_SNMP_SNMP_H */
|
|
#endif /* defined(HAVE_UCD_SNMP_SNMP_H) || defined(HAVE_SNMP_SNMP_H) */
|
|
proto_snmp = proto_register_protocol("Simple Network Management Protocol",
|
|
"SNMP", "snmp");
|
|
proto_smux = proto_register_protocol("SNMP Multiplex Protocol",
|
|
"SMUX", "smux");
|
|
proto_register_field_array(proto_snmp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_snmp(void)
|
|
{
|
|
old_dissector_add("udp.port", UDP_PORT_SNMP, dissect_snmp,
|
|
proto_snmp);
|
|
old_dissector_add("udp.port", UDP_PORT_SNMP_TRAP, dissect_snmp,
|
|
proto_snmp);
|
|
old_dissector_add("tcp.port", TCP_PORT_SMUX, dissect_smux,
|
|
proto_smux);
|
|
old_dissector_add("ethertype", ETHERTYPE_SNMP, dissect_snmp,
|
|
proto_snmp);
|
|
old_dissector_add("ipx.socket", IPX_SOCKET_SNMP_AGENT, dissect_snmp,
|
|
proto_snmp);
|
|
old_dissector_add("ipx.socket", IPX_SOCKET_SNMP_SINK, dissect_snmp,
|
|
proto_snmp);
|
|
}
|