979 lines
28 KiB
C
979 lines
28 KiB
C
/* packet-snmp.c
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* Routines for SNMP (simple network management protocol)
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* Copyright (C) 1998 Didier Jorand
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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 [historic].
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*
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* See RFCs 2570-2576 for SNMPv3
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* Updated to use the asn2eth compiler made by Tomas Kukosa
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* Copyright (C) 2005 Anders Broman [AT] ericsson.com
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*
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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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 <glib.h>
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#include <epan/packet.h>
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#include <epan/conversation.h>
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#include "etypes.h"
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#include <epan/prefs.h>
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#include <epan/sminmpec.h>
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#include <epan/emem.h>
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#include "packet-ipx.h"
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#include "packet-hpext.h"
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#include "packet-ber.h"
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#ifdef HAVE_SOME_SNMP
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#ifdef HAVE_NET_SNMP
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# include <net-snmp/net-snmp-config.h>
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# include <net-snmp/mib_api.h>
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# include <net-snmp/library/default_store.h>
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# include <net-snmp/config_api.h>
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#else /* HAVE_NET_SNMP */
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# include <ucd-snmp/ucd-snmp-config.h>
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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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# include <ucd-snmp/default_store.h>
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# include <ucd-snmp/read_config.h>
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# include <ucd-snmp/tools.h>
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#endif /* HAVE_NET_SNMP */
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#ifndef NETSNMP_DS_LIBRARY_ID
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# define NETSNMP_DS_LIBRARY_ID DS_LIBRARY_ID
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# define NETSNMP_DS_LIB_NO_TOKEN_WARNINGS DS_LIB_NO_TOKEN_WARNINGS
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# define NETSNMP_DS_LIB_PRINT_SUFFIX_ONLY DS_LIB_PRINT_SUFFIX_ONLY
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# define netsnmp_ds_set_boolean ds_set_boolean
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# define netsnmp_ds_set_int ds_set_int
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#endif
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#ifdef _WIN32
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# include <epan/filesystem.h>
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#endif /* _WIN32 */
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/*
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* Define values "sprint_realloc_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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#endif /* HAVE_SOME_SNMP */
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#include "packet-snmp.h"
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#include "format-oid.h"
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#define PNAME "Simple Network Management Protocol"
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#define PSNAME "SNMP"
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#define PFNAME "snmp"
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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_SNMP 161
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#define TCP_PORT_SNMP_TRAP 162
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#define TCP_PORT_SMUX 199
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/* Initialize the protocol and registered fields */
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static int proto_snmp = -1;
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static int proto_smux = -1;
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/* Default MIB modules to load */
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/*
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* XXX - According to Wes Hardaker, we shouldn't do this:
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* http://www.ethereal.com/lists/ethereal-dev/200412/msg00222.html
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*/
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#ifdef _WIN32
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# define DEF_MIB_MODULES "IP-MIB;IF-MIB;TCP-MIB;UDP-MIB;SNMPv2-MIB;RFC1213-MIB;UCD-SNMP-MIB"
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# define IMPORT_SEPARATOR ":"
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#else
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# define DEF_MIB_MODULES "IP-MIB:IF-MIB:TCP-MIB:UDP-MIB:SNMPv2-MIB:RFC1213-MIB:UCD-SNMP-MIB"
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# define IMPORT_SEPARATOR ";"
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#endif /* _WIN32 */
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static const gchar *mib_modules = DEF_MIB_MODULES;
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static gboolean display_oid = TRUE;
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/* Subdissector tables */
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static dissector_table_t variable_oid_dissector_table;
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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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/* desegmentation of SNMP-over-TCP */
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static gboolean snmp_desegment = TRUE;
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/* Global variables */
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guint32 MsgSecurityModel;
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static dissector_handle_t snmp_handle;
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static dissector_handle_t data_handle;
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static int hf_snmp_v3_flags_auth = -1;
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static int hf_snmp_v3_flags_crypt = -1;
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static int hf_snmp_v3_flags_report = -1;
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static int hf_snmp_engineid_conform = -1;
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static int hf_snmp_engineid_enterprise = -1;
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static int hf_snmp_engineid_format = -1;
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static int hf_snmp_engineid_ipv4 = -1;
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static int hf_snmp_engineid_ipv6 = -1;
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static int hf_snmp_engineid_mac = -1;
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static int hf_snmp_engineid_text = -1;
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static int hf_snmp_engineid_time = -1;
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static int hf_snmp_engineid_data = -1;
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#include "packet-snmp-hf.c"
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static int hf_smux_version = -1;
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static int hf_smux_pdutype = -1;
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/* Initialize the subtree pointers */
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static gint ett_smux = -1;
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static gint ett_snmp = -1;
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static gint ett_engineid = -1;
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static gint ett_msgFlags = -1;
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#include "packet-snmp-ett.c"
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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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/* 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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int oid_to_subid_buf(const guint8 *oid, gint oid_len, subid_t *buf, int buf_len) {
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int i, out_len;
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guint8 byte;
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guint32 value;
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value=0; out_len = 0;
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for (i=0; i<oid_len; i++){
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if (out_len >= buf_len) break;
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byte = oid[i];
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if (i == 0) {
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buf[out_len++] = byte/40;
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buf[out_len++] = byte%40;
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continue;
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}
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value = (value << 7) | (byte & 0x7F);
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if (byte & 0x80) {
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continue;
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}
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buf[out_len++] = value;
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value = 0;
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}
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return out_len;
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}
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gchar *
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format_oid(subid_t *oid, guint oid_length)
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{
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char *result;
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int result_len;
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int len;
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unsigned int i;
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char *buf;
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#ifdef HAVE_SOME_SNMP
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guchar *oid_string;
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size_t oid_string_len;
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size_t oid_out_len;
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#endif
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result_len = oid_length * 22;
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#ifdef HAVE_SOME_SNMP
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/*
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* Get the decoded form of the OID, and add its length to the
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* length of the result string.
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*
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* XXX - check for "sprint_realloc_objid()" failure.
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*/
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oid_string_len = 256;
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oid_string = malloc(oid_string_len);
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if (oid_string == NULL)
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return NULL;
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*oid_string = '\0';
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oid_out_len = 0;
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sprint_realloc_objid(&oid_string, &oid_string_len, &oid_out_len, 1,
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oid, oid_length);
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result_len += strlen(oid_string) + 3;
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#endif
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result = ep_alloc(result_len + 1);
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buf = result;
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len = g_snprintf(buf, result_len + 1 - (buf-result), "%lu", (unsigned long)oid[0]);
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buf += len;
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for (i = 1; i < oid_length;i++) {
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len = g_snprintf(buf, result_len + 1 - (buf-result), ".%lu", (unsigned long)oid[i]);
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buf += len;
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}
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#ifdef HAVE_SOME_SNMP
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/*
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* Append the decoded form of the OID.
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*/
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g_snprintf(buf, result_len + 1 -(buf-result), " (%s)", oid_string);
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free(oid_string);
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#endif
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return result;
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}
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/* returns the decoded (can be NULL) and non_decoded OID strings,
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returned pointers shall be freed by the caller */
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void
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new_format_oid(subid_t *oid, guint oid_length,
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gchar **non_decoded, gchar **decoded)
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{
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int non_decoded_len;
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int len;
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unsigned int i;
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char *buf;
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#ifdef HAVE_SOME_SNMP
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guchar *oid_string;
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size_t oid_string_len;
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size_t oid_out_len;
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/*
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* Get the decoded form of the OID, and add its length to the
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* length of the result string.
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*/
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oid_string_len = 256;
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oid_string = malloc(oid_string_len);
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if (oid_string != NULL) {
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*oid_string = '\0';
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oid_out_len = 0;
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sprint_realloc_objid(&oid_string, &oid_string_len, &oid_out_len, 1,
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oid, oid_length);
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}
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*decoded = oid_string;
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#else
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*decoded = NULL;
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#endif
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non_decoded_len = oid_length * 22 + 1;
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*non_decoded = ep_alloc(non_decoded_len);
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buf = *non_decoded;
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len = g_snprintf(buf, non_decoded_len-(buf-*non_decoded), "%lu", (unsigned long)oid[0]);
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buf += len;
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for (i = 1; i < oid_length; i++) {
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len = g_snprintf(buf, non_decoded_len-(buf-*non_decoded), ".%lu", (unsigned long)oid[i]);
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buf += len;
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}
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}
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#define F_SNMP_ENGINEID_CONFORM 0x80
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#define SNMP_ENGINEID_RFC1910 0x00
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#define SNMP_ENGINEID_RFC3411 0x01
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static const true_false_string tfs_snmp_engineid_conform = {
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"RFC3411 (SNMPv3)",
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"RFC1910 (Non-SNMPv3)"
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};
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#define SNMP_ENGINEID_FORMAT_IPV4 0x01
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#define SNMP_ENGINEID_FORMAT_IPV6 0x02
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#define SNMP_ENGINEID_FORMAT_MACADDRESS 0x03
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#define SNMP_ENGINEID_FORMAT_TEXT 0x04
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#define SNMP_ENGINEID_FORMAT_OCTETS 0x05
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static const value_string snmp_engineid_format_vals[] = {
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{ SNMP_ENGINEID_FORMAT_IPV4, "IPv4 address" },
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{ SNMP_ENGINEID_FORMAT_IPV6, "IPv6 address" },
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{ SNMP_ENGINEID_FORMAT_MACADDRESS, "MAC address" },
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{ SNMP_ENGINEID_FORMAT_TEXT, "Text, administratively assigned" },
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{ SNMP_ENGINEID_FORMAT_OCTETS, "Octets, administratively assigned" },
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{ 0, NULL }
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};
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/*
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* SNMP Engine ID dissection according to RFC 3411 (SnmpEngineID TC)
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* or historic RFC 1910 (AgentID)
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*/
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int
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dissect_snmp_engineid(proto_tree *tree, tvbuff_t *tvb, int offset, int len)
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{
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proto_item *item = NULL;
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guint8 conformance, format;
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guint32 enterpriseid, seconds;
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nstime_t ts;
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int len_remain = len;
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/* first bit: engine id conformance */
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if (len_remain<4) return offset;
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conformance = ((tvb_get_guint8(tvb, offset)>>7) && 0x01);
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proto_tree_add_item(tree, hf_snmp_engineid_conform, tvb, offset, 1, FALSE);
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/* 4-byte enterprise number/name */
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if (len_remain<4) return offset;
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enterpriseid = tvb_get_ntohl(tvb, offset);
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if (conformance)
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enterpriseid -= 0x80000000; /* ignore first bit */
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proto_tree_add_uint(tree, hf_snmp_engineid_enterprise, tvb, offset, 4, enterpriseid);
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offset+=4;
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len_remain-=4;
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switch(conformance) {
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case SNMP_ENGINEID_RFC1910:
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/* 12-byte AgentID w/ 8-byte trailer */
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if (len_remain==8) {
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proto_tree_add_text(tree, tvb, offset, 8, "AgentID Trailer: 0x%s",
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tvb_bytes_to_str(tvb, offset, 8));
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offset+=8;
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len_remain-=8;
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} else {
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proto_tree_add_text(tree, tvb, offset, len_remain, "<Data not conforming to RFC1910>");
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return offset;
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}
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break;
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case SNMP_ENGINEID_RFC3411: /* variable length: 5..32 */
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/* 1-byte format specifier */
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if (len_remain<1) return offset;
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format = tvb_get_guint8(tvb, offset);
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item = proto_tree_add_uint_format(tree, hf_snmp_engineid_format, tvb, offset, 1, format, "Engine ID Format: %s (%d)",
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val_to_str(format, snmp_engineid_format_vals, "Reserved/Enterprise-specific"), format);
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offset+=1;
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len_remain-=1;
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|
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switch(format) {
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case SNMP_ENGINEID_FORMAT_IPV4:
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/* 4-byte IPv4 address */
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if (len_remain==4) {
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proto_tree_add_item(tree, hf_snmp_engineid_ipv4, tvb, offset, 4, FALSE);
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offset+=4;
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len_remain=0;
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}
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break;
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case SNMP_ENGINEID_FORMAT_IPV6:
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/* 16-byte IPv6 address */
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if (len_remain==16) {
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proto_tree_add_item(tree, hf_snmp_engineid_ipv6, tvb, offset, 16, FALSE);
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offset+=16;
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len_remain=0;
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}
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break;
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case SNMP_ENGINEID_FORMAT_MACADDRESS:
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/* 6-byte MAC address */
|
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if (len_remain==6) {
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proto_tree_add_item(tree, hf_snmp_engineid_mac, tvb, offset, 6, FALSE);
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offset+=6;
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len_remain=0;
|
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}
|
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break;
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case SNMP_ENGINEID_FORMAT_TEXT:
|
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/* max. 27-byte string, administratively assigned */
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if (len_remain<=27) {
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proto_tree_add_item(tree, hf_snmp_engineid_text, tvb, offset, len_remain, FALSE);
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offset+=len_remain;
|
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len_remain=0;
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}
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break;
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case 128:
|
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/* most common enterprise-specific format: (ucd|net)-snmp random */
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if ((enterpriseid==2021)||(enterpriseid==8072)) {
|
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proto_item_append_text(item, (enterpriseid==2021) ? ": UCD-SNMP Random" : ": Net-SNMP Random");
|
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/* demystify: 4B random, 4B epoch seconds */
|
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if (len_remain==8) {
|
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proto_tree_add_item(tree, hf_snmp_engineid_data, tvb, offset, 4, FALSE);
|
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seconds = tvb_get_letohl(tvb, offset+4);
|
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ts.secs = seconds;
|
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proto_tree_add_time_format(tree, hf_snmp_engineid_time, tvb, offset+4, 4,
|
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&ts, "Engine ID Data: Creation Time: %s",
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abs_time_secs_to_str(seconds));
|
|
offset+=8;
|
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len_remain=0;
|
|
}
|
|
}
|
|
break;
|
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case SNMP_ENGINEID_FORMAT_OCTETS:
|
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default:
|
|
/* max. 27 bytes, administratively assigned or unknown format */
|
|
if (len_remain<=27) {
|
|
proto_tree_add_item(tree, hf_snmp_engineid_data, tvb, offset, len_remain, FALSE);
|
|
offset+=len_remain;
|
|
len_remain=0;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (len_remain>0) {
|
|
proto_tree_add_text(tree, tvb, offset, len_remain, "<Data not conforming to RFC3411>");
|
|
offset+=len_remain;
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
#include "packet-snmp-fn.c"
|
|
|
|
guint
|
|
dissect_snmp_pdu(tvbuff_t *tvb, int offset, packet_info *pinfo,
|
|
proto_tree *tree, int proto, gint ett, gboolean is_tcp)
|
|
{
|
|
|
|
guint length_remaining;
|
|
gint8 class;
|
|
gboolean pc, ind = 0;
|
|
gint32 tag;
|
|
guint32 len;
|
|
guint message_length;
|
|
int start_offset = offset;
|
|
guint32 version = 0;
|
|
|
|
proto_tree *snmp_tree = NULL;
|
|
proto_item *item = NULL;
|
|
|
|
/*
|
|
* This will throw an exception if we don't have any data left.
|
|
* That's what we want. (See "tcp_dissect_pdus()", which is
|
|
* similar, but doesn't have to deal with ASN.1.
|
|
* XXX - can we make "tcp_dissect_pdus()" provide enough
|
|
* information to the "get_pdu_len" routine so that we could
|
|
* have that routine deal with ASN.1, and just use
|
|
* "tcp_dissect_pdus()"?)
|
|
*/
|
|
length_remaining = tvb_ensure_length_remaining(tvb, offset);
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
/*
|
|
* If this is SNMP-over-TCP, we might have to do reassembly
|
|
* in order to read the "Sequence Of" header.
|
|
*/
|
|
if (is_tcp && snmp_desegment && pinfo->can_desegment) {
|
|
/*
|
|
* This is TCP, and we should, and can, do reassembly.
|
|
*
|
|
* Is the "Sequence Of" header split across segment
|
|
* boundaries? We requre at least 6 bytes for the
|
|
* header, which allows for a 4-byte length (ASN.1
|
|
* BER).
|
|
*/
|
|
if (length_remaining < 6) {
|
|
pinfo->desegment_offset = offset;
|
|
pinfo->desegment_len = 6 - length_remaining;
|
|
|
|
/*
|
|
* Return 0, which means "I didn't dissect anything
|
|
* because I don't have enough data - we need
|
|
* to desegment".
|
|
*/
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* OK, try to read the "Sequence Of" header; this gets the total
|
|
* length of the SNMP message.
|
|
*/
|
|
/* Set tree to 0 to not display internakl BER fields if option used.*/
|
|
offset = dissect_ber_identifier(pinfo, 0, tvb, offset, &class, &pc, &tag);
|
|
offset = dissect_ber_length(pinfo, 0, tvb, offset, &len, &ind);
|
|
|
|
message_length = len + 2;
|
|
offset = dissect_ber_integer(FALSE, pinfo, 0, tvb, offset, -1, &version);
|
|
|
|
|
|
/*
|
|
* If this is SNMP-over-TCP, we might have to do reassembly
|
|
* to get all of this message.
|
|
*/
|
|
if (is_tcp && snmp_desegment && pinfo->can_desegment) {
|
|
/*
|
|
* Yes - is the message split across segment boundaries?
|
|
*/
|
|
if (length_remaining < message_length) {
|
|
/*
|
|
* Yes. Tell the TCP dissector where the data
|
|
* for this message starts in the data it handed
|
|
* us, and how many more bytes we need, and
|
|
* return.
|
|
*/
|
|
pinfo->desegment_offset = start_offset;
|
|
pinfo->desegment_len =
|
|
message_length - length_remaining;
|
|
|
|
/*
|
|
* Return 0, which means "I didn't dissect anything
|
|
* because I don't have enough data - we need
|
|
* to desegment".
|
|
*/
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL,
|
|
proto_get_protocol_short_name(find_protocol_by_id(proto)));
|
|
}
|
|
|
|
if (tree) {
|
|
item = proto_tree_add_item(tree, proto, tvb, offset,
|
|
message_length, FALSE);
|
|
snmp_tree = proto_item_add_subtree(item, ett);
|
|
}
|
|
|
|
switch (version){
|
|
case 0: /* v1 */
|
|
case 1: /* v2c */
|
|
offset = dissect_snmp_Message(FALSE , tvb, start_offset, pinfo, snmp_tree, -1);
|
|
break;
|
|
case 2: /* v2u */
|
|
offset = dissect_snmp_Messagev2u(FALSE , tvb, start_offset, pinfo, snmp_tree, -1);
|
|
break;
|
|
/* v3 */
|
|
case 3:
|
|
offset = dissect_snmp_SNMPv3Message(FALSE , tvb, start_offset, pinfo, snmp_tree, -1);
|
|
break;
|
|
default:
|
|
/*
|
|
* Return the length remaining in the tvbuff, so
|
|
* if this is SNMP-over-TCP, our caller thinks there's
|
|
* nothing left to dissect.
|
|
*/
|
|
proto_tree_add_text(snmp_tree, tvb, offset, -1,"Unknown version");
|
|
return length_remaining;
|
|
break;
|
|
}
|
|
return offset;
|
|
|
|
|
|
|
|
}
|
|
|
|
static gint
|
|
dissect_snmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
conversation_t *conversation;
|
|
int offset;
|
|
gint8 tmp_class;
|
|
gboolean tmp_pc;
|
|
gint32 tmp_tag;
|
|
guint32 tmp_length;
|
|
gboolean tmp_ind;
|
|
|
|
/*
|
|
* See if this looks like SNMP or not. if not, return 0 so
|
|
* ethereal can try som other dissector instead.
|
|
*/
|
|
/* All SNMP packets are BER encoded and consist of a SEQUENCE
|
|
* that spans the entire PDU. The first item is an INTEGER that
|
|
* has the values 0-2 (version 1-3).
|
|
* if not it is not snmp.
|
|
*/
|
|
/* SNMP starts with a SEQUENCE */
|
|
offset = get_ber_identifier(tvb, 0, &tmp_class, &tmp_pc, &tmp_tag);
|
|
if((tmp_class!=BER_CLASS_UNI)||(tmp_tag!=BER_UNI_TAG_SEQUENCE)){
|
|
return 0;
|
|
}
|
|
/* then comes a length which spans the rest of the tvb */
|
|
offset = get_ber_length(NULL, tvb, offset, &tmp_length, &tmp_ind);
|
|
if(tmp_length!=(guint32)tvb_reported_length_remaining(tvb, offset)){
|
|
return 0;
|
|
}
|
|
/* then comes an INTEGER (version)*/
|
|
offset = get_ber_identifier(tvb, offset, &tmp_class, &tmp_pc, &tmp_tag);
|
|
if((tmp_class!=BER_CLASS_UNI)||(tmp_tag!=BER_UNI_TAG_INTEGER)){
|
|
return 0;
|
|
}
|
|
/* do we need to test that version is 0 - 2 (version1-3) ? */
|
|
|
|
|
|
/*
|
|
* 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 one address/port pair
|
|
* matching the source IP address and port of this packet,
|
|
* the other address matching the destination IP address of this
|
|
* packet, and any destination port.
|
|
*
|
|
* If not, we create one, with its address 1/port 1 pair being
|
|
* the source address/port of this packet, its address 2 being
|
|
* the destination address of this packet, and its port 2 being
|
|
* wildcarded, and give it the SNMP dissector as a dissector.
|
|
*/
|
|
if (pinfo->destport == UDP_PORT_SNMP) {
|
|
conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst, PT_UDP,
|
|
pinfo->srcport, 0, NO_PORT_B);
|
|
if( (conversation == NULL) || (conversation->dissector_handle!=snmp_handle) ){
|
|
conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst, PT_UDP,
|
|
pinfo->srcport, 0, NO_PORT2);
|
|
conversation_set_dissector(conversation, snmp_handle);
|
|
}
|
|
}
|
|
|
|
return dissect_snmp_pdu(tvb, 0, pinfo, tree, proto_snmp, ett_snmp, FALSE);
|
|
}
|
|
static void
|
|
dissect_snmp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
int offset = 0;
|
|
guint message_len;
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) > 0) {
|
|
message_len = dissect_snmp_pdu(tvb, 0, pinfo, tree,
|
|
proto_snmp, ett_snmp, TRUE);
|
|
if (message_len == 0) {
|
|
/*
|
|
* We don't have all the data for that message,
|
|
* so we need to do desegmentation;
|
|
* "dissect_snmp_pdu()" has set that up.
|
|
*/
|
|
break;
|
|
}
|
|
offset += message_len;
|
|
}
|
|
}
|
|
static void
|
|
dissect_smux_pdu(tvbuff_t *tvb, int offset, packet_info *pinfo,
|
|
proto_tree *tree, int proto, gint ett)
|
|
{
|
|
/* FIX ME */
|
|
}
|
|
static void
|
|
dissect_smux(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_smux_pdu(tvb, 0, pinfo, tree, proto_smux, ett_smux);
|
|
}
|
|
static void
|
|
process_prefs(void)
|
|
{
|
|
#ifdef HAVE_SOME_SNMP
|
|
gchar *tmp_mib_modules;
|
|
static gboolean mibs_loaded = FALSE;
|
|
|
|
if (mibs_loaded) {
|
|
/*
|
|
* Unload the MIBs, as we'll be reloading them based on
|
|
* the current preference setting.
|
|
*/
|
|
shutdown_mib(); /* unload MIBs */
|
|
}
|
|
|
|
/*
|
|
* Cannot check if MIBS is already set, as it could be set by Ethereal.
|
|
*
|
|
* If we have a list of modules to load, put that list in MIBS,
|
|
* otherwise clear MIBS.
|
|
*/
|
|
if (mib_modules != NULL) {
|
|
tmp_mib_modules = g_strconcat("MIBS=", mib_modules, NULL);
|
|
/*
|
|
* Try to be clever and replace colons for semicolons under
|
|
* Windows. Do the converse on non-Windows systems. This
|
|
* handles cases where we've copied a preferences file
|
|
* between a non-Windows box and a Windows box or upgraded
|
|
* from an older version of Ethereal under Windows.
|
|
*/
|
|
g_strdelimit(tmp_mib_modules, IMPORT_SEPARATOR, ENV_SEPARATOR_CHAR);
|
|
|
|
#ifdef _WIN32
|
|
_putenv(tmp_mib_modules);
|
|
#else
|
|
putenv(tmp_mib_modules);
|
|
#endif /*_WIN32*/
|
|
} else {
|
|
#ifdef _WIN32
|
|
_putenv("MIBS");
|
|
#else
|
|
putenv("MIBS");
|
|
#endif /* _WIN32 */
|
|
}
|
|
|
|
/*
|
|
* Load the MIBs.
|
|
*/
|
|
register_mib_handlers();
|
|
read_premib_configs();
|
|
init_mib();
|
|
read_configs();
|
|
mibs_loaded = TRUE;
|
|
#endif /* HAVE_SOME_SNMP */
|
|
}
|
|
/*--- proto_register_snmp -------------------------------------------*/
|
|
void proto_register_snmp(void) {
|
|
|
|
#if defined(_WIN32) && defined(HAVE_SOME_SNMP)
|
|
char *mib_path;
|
|
int mib_path_len;
|
|
#define MIB_PATH_APPEND "snmp\\mibs"
|
|
#endif
|
|
gchar *tmp_mib_modules;
|
|
|
|
/* List of fields */
|
|
static hf_register_info hf[] = {
|
|
{ &hf_snmp_v3_flags_auth,
|
|
{ "Authenticated", "snmp.v3.flags.auth", FT_BOOLEAN, 8,
|
|
TFS(&flags_set_truth), TH_AUTH, "", HFILL }},
|
|
{ &hf_snmp_v3_flags_crypt,
|
|
{ "Encrypted", "snmp.v3.flags.crypt", FT_BOOLEAN, 8,
|
|
TFS(&flags_set_truth), TH_CRYPT, "", HFILL }},
|
|
{ &hf_snmp_v3_flags_report,
|
|
{ "Reportable", "snmp.v3.flags.report", FT_BOOLEAN, 8,
|
|
TFS(&flags_set_truth), TH_REPORT, "", HFILL }},
|
|
{ &hf_snmp_engineid_conform, {
|
|
"Engine ID Conformance", "snmp.engineid.conform", FT_BOOLEAN, 8,
|
|
TFS(&tfs_snmp_engineid_conform), F_SNMP_ENGINEID_CONFORM, "Engine ID RFC3411 Conformance", HFILL }},
|
|
{ &hf_snmp_engineid_enterprise, {
|
|
"Engine Enterprise ID", "snmp.engineid.enterprise", FT_UINT32, BASE_DEC,
|
|
VALS(sminmpec_values), 0, "Engine Enterprise ID", HFILL }},
|
|
{ &hf_snmp_engineid_format, {
|
|
"Engine ID Format", "snmp.engineid.format", FT_UINT8, BASE_DEC,
|
|
VALS(snmp_engineid_format_vals), 0, "Engine ID Format", HFILL }},
|
|
{ &hf_snmp_engineid_ipv4, {
|
|
"Engine ID Data: IPv4 address", "snmp.engineid.ipv4", FT_IPv4, BASE_NONE,
|
|
NULL, 0, "Engine ID Data: IPv4 address", HFILL }},
|
|
{ &hf_snmp_engineid_ipv6, {
|
|
"Engine ID Data: IPv6 address", "snmp.engineid.ipv6", FT_IPv6, BASE_NONE,
|
|
NULL, 0, "Engine ID Data: IPv6 address", HFILL }},
|
|
{ &hf_snmp_engineid_mac, {
|
|
"Engine ID Data: MAC address", "snmp.engineid.mac", FT_ETHER, BASE_NONE,
|
|
NULL, 0, "Engine ID Data: MAC address", HFILL }},
|
|
{ &hf_snmp_engineid_text, {
|
|
"Engine ID Data: Text", "snmp.engineid.text", FT_STRING, BASE_NONE,
|
|
NULL, 0, "Engine ID Data: Text", HFILL }},
|
|
{ &hf_snmp_engineid_time, {
|
|
"Engine ID Data: Time", "snmp.engineid.time", FT_ABSOLUTE_TIME, BASE_NONE,
|
|
NULL, 0, "Engine ID Data: Time", HFILL }},
|
|
{ &hf_snmp_engineid_data, {
|
|
"Engine ID Data", "snmp.engineid.data", FT_BYTES, BASE_HEX,
|
|
NULL, 0, "Engine ID Data", HFILL }},
|
|
|
|
#include "packet-snmp-hfarr.c"
|
|
};
|
|
|
|
/* List of subtrees */
|
|
static gint *ett[] = {
|
|
&ett_snmp,
|
|
&ett_engineid,
|
|
&ett_msgFlags,
|
|
|
|
#include "packet-snmp-ettarr.c"
|
|
};
|
|
module_t *snmp_module;
|
|
|
|
#ifdef HAVE_SOME_SNMP
|
|
|
|
#ifdef _WIN32
|
|
/* Set MIBDIRS so that the SNMP library can find its mibs. */
|
|
/* XXX - Should we set MIBS or MIBFILES as well? */
|
|
mib_path_len=strlen(get_datafile_dir()) + strlen(MIB_PATH_APPEND) + 20;
|
|
mib_path = ep_alloc (mib_path_len);
|
|
g_snprintf (mib_path, mib_path_len, "MIBDIRS=%s\\%s", get_datafile_dir(), MIB_PATH_APPEND);
|
|
/* Amazingly enough, Windows does not provide setenv(). */
|
|
if (getenv("MIBDIRS") == NULL)
|
|
_putenv(mib_path);
|
|
|
|
#endif /* _WIN32 */
|
|
|
|
/*
|
|
* Suppress warnings about unknown tokens - we aren't initializing
|
|
* UCD SNMP in its entirety, we're just initializing the
|
|
* MIB-handling part because that's all we're using, which
|
|
* means that entries in the configuration file for other
|
|
* pars of the library will not be handled, and we don't want
|
|
* the config file reading code to whine about that.
|
|
*/
|
|
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
|
|
NETSNMP_DS_LIB_NO_TOKEN_WARNINGS, TRUE);
|
|
netsnmp_ds_set_int(NETSNMP_DS_LIBRARY_ID,
|
|
NETSNMP_DS_LIB_PRINT_SUFFIX_ONLY, 2);
|
|
#endif /* HAVE_SOME_SNMP */
|
|
|
|
|
|
/* Register protocol */
|
|
proto_snmp = proto_register_protocol(PNAME, PSNAME, PFNAME);
|
|
new_register_dissector("snmp", dissect_snmp, proto_snmp);
|
|
|
|
/* Register fields and subtrees */
|
|
proto_register_field_array(proto_snmp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
|
|
/* Register configuration preferences */
|
|
snmp_module = prefs_register_protocol(proto_snmp, process_prefs);
|
|
prefs_register_bool_preference(snmp_module, "display_oid",
|
|
"Show SNMP OID in info column",
|
|
"Whether the SNMP OID should be shown in the info column",
|
|
&display_oid);
|
|
|
|
/*
|
|
* Set the default value of "mib_modules".
|
|
*
|
|
* If the MIBS environment variable is set, make its value
|
|
* the value of "mib_modules", otherwise, set "mib_modules"
|
|
* to DEF_MIB_MODULES.
|
|
*/
|
|
tmp_mib_modules = getenv("MIBS");
|
|
if (tmp_mib_modules != NULL)
|
|
mib_modules = tmp_mib_modules;
|
|
prefs_register_string_preference(snmp_module, "mib_modules",
|
|
"MIB modules to load",
|
|
"List of MIB modules to load (the list is set to environment variable MIBS if the variable is not already set)"
|
|
"The list must be separated by colons (:) on non-Windows systems and semicolons (;) on Windows systems",
|
|
&mib_modules);
|
|
prefs_register_bool_preference(snmp_module, "desegment",
|
|
"Reassemble SNMP-over-TCP messages\nspanning multiple TCP segments",
|
|
"Whether the SNMP dissector should reassemble messages spanning multiple TCP segments."
|
|
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
|
|
&snmp_desegment);
|
|
|
|
}
|
|
|
|
|
|
/*--- proto_reg_handoff_snmp ---------------------------------------*/
|
|
void proto_reg_handoff_snmp(void) {
|
|
dissector_handle_t snmp_tcp_handle;
|
|
|
|
snmp_handle = find_dissector("snmp");
|
|
|
|
dissector_add("udp.port", UDP_PORT_SNMP, snmp_handle);
|
|
dissector_add("udp.port", UDP_PORT_SNMP_TRAP, snmp_handle);
|
|
dissector_add("ethertype", ETHERTYPE_SNMP, snmp_handle);
|
|
dissector_add("ipx.socket", IPX_SOCKET_SNMP_AGENT, snmp_handle);
|
|
dissector_add("ipx.socket", IPX_SOCKET_SNMP_SINK, snmp_handle);
|
|
dissector_add("hpext.dxsap", HPEXT_SNMP, snmp_handle);
|
|
|
|
snmp_tcp_handle = create_dissector_handle(dissect_snmp_tcp, proto_snmp);
|
|
dissector_add("tcp.port", TCP_PORT_SNMP, snmp_tcp_handle);
|
|
dissector_add("tcp.port", TCP_PORT_SNMP_TRAP, snmp_tcp_handle);
|
|
|
|
data_handle = find_dissector("data");
|
|
|
|
/*
|
|
* Process preference settings.
|
|
*
|
|
* We can't do this in the register routine, as preferences aren't
|
|
* read until all dissector register routines have been called (so
|
|
* that all dissector preferences have been registered).
|
|
*/
|
|
process_prefs();
|
|
|
|
}
|
|
|
|
void
|
|
proto_register_smux(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_smux_version,
|
|
{ "Version", "smux.version", FT_UINT8, BASE_DEC, NULL,
|
|
0x0, "", HFILL }},
|
|
{ &hf_smux_pdutype,
|
|
{ "PDU type", "smux.pdutype", FT_UINT8, BASE_DEC, VALS(smux_types),
|
|
0x0, "", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_smux,
|
|
};
|
|
|
|
proto_smux = proto_register_protocol("SNMP Multiplex Protocol",
|
|
"SMUX", "smux");
|
|
proto_register_field_array(proto_smux, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
variable_oid_dissector_table =
|
|
register_dissector_table("snmp.variable_oid",
|
|
"SNMP Variable OID", FT_STRING, BASE_NONE);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_smux(void)
|
|
{
|
|
dissector_handle_t smux_handle;
|
|
|
|
smux_handle = create_dissector_handle(dissect_smux, proto_smux);
|
|
dissector_add("tcp.port", TCP_PORT_SMUX, smux_handle);
|
|
}
|
|
|
|
|