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wireshark/packet-snmp.c

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/* packet-snmp.c
* Routines for SNMP (simple network management protocol)
* Copyright (C) 1998 Didier Jorand
*
* See RFC 1157 for SNMPv1.
*
* See RFCs 1901, 1905, and 1906 for SNMPv2c.
*
* See RFCs 1905, 1906, 1909, and 1910 for SNMPv2u [historic].
*
* See RFCs 2570-2576 for SNMPv3
*
* $Id: packet-snmp.c,v 1.126 2004/01/23 10:25:08 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* Some stuff from:
*
* GXSNMP -- An snmp mangament application
* Copyright (C) 1998 Gregory McLean & Jochen Friedrich
* Beholder RMON ethernet network monitor,Copyright (C) 1993 DNPAP group
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/strutil.h>
#include <epan/conversation.h>
#include "etypes.h"
#include "prefs.h"
#include "packet-ipx.h"
#include "packet-hpext.h"
#include "packet-frame.h"
#ifdef HAVE_SOME_SNMP
#ifdef HAVE_NET_SNMP
# include <net-snmp/net-snmp-config.h>
# include <net-snmp/mib_api.h>
# include <net-snmp/library/default_store.h>
# include <net-snmp/config_api.h>
#else /* HAVE_NET_SNMP */
# include <ucd-snmp/ucd-snmp-config.h>
# include <ucd-snmp/asn1.h>
# include <ucd-snmp/snmp_api.h>
# include <ucd-snmp/snmp_impl.h>
# include <ucd-snmp/mib.h>
# include <ucd-snmp/default_store.h>
# include <ucd-snmp/read_config.h>
# include <ucd-snmp/tools.h>
#endif /* HAVE_NET_SNMP */
#ifndef NETSNMP_DS_LIBRARY_ID
# define NETSNMP_DS_LIBRARY_ID DS_LIBRARY_ID
# define NETSNMP_DS_LIB_NO_TOKEN_WARNINGS DS_LIB_NO_TOKEN_WARNINGS
# define NETSNMP_DS_LIB_PRINT_SUFFIX_ONLY DS_LIB_PRINT_SUFFIX_ONLY
# define netsnmp_ds_set_boolean ds_set_boolean
# define netsnmp_ds_set_int ds_set_int
#endif
#ifdef WIN32
# include <epan/filesystem.h>
#endif /* WIN32 */
/*
* Define values "sprint_realloc_value()" expects.
*/
# define VALTYPE_INTEGER ASN_INTEGER
# define VALTYPE_COUNTER ASN_COUNTER
# define VALTYPE_GAUGE ASN_GAUGE
# define VALTYPE_TIMETICKS ASN_TIMETICKS
# define VALTYPE_STRING ASN_OCTET_STR
# define VALTYPE_IPADDR ASN_IPADDRESS
# define VALTYPE_OPAQUE ASN_OPAQUE
# define VALTYPE_NSAP ASN_NSAP
# define VALTYPE_OBJECTID ASN_OBJECT_ID
# define VALTYPE_BITSTR ASN_BIT_STR
# define VALTYPE_COUNTER64 ASN_COUNTER64
#endif /* HAVE_SOME_SNMP */
#include "asn1.h"
#include "packet-snmp.h"
#include "format-oid.h"
/* Take a pointer that may be null and return a pointer that's not null
by turning null pointers into pointers to the above null string,
and, if the argument pointer wasn't null, make sure we handle
non-printable characters in the string by escaping them. */
#define SAFE_STRING(s, l) (((s) != NULL) ? format_text((s), (l)) : "")
static int proto_snmp = -1;
/* Default MIB modules to load */
#define DEF_MIB_MODULES "IP-MIB:IF-MIB:TCP-MIB:UDP-MIB:SNMPv2-MIB:RFC1213-MIB:UCD-SNMP-MIB"
static gchar *mib_modules = DEF_MIB_MODULES;
static gboolean display_oid = TRUE;
static gint ett_snmp = -1;
static gint ett_parameters = -1;
static gint ett_parameters_qos = -1;
static gint ett_global = -1;
static gint ett_flags = -1;
static gint ett_secur = -1;
static int hf_snmp_version = -1;
static int hf_snmp_community = -1;
static int hf_snmp_request_id = -1;
static int hf_snmp_pdutype = -1;
static int hf_snmp_agent = -1;
static int hf_snmp_enterprise = -1;
static int hf_snmp_error_status = -1;
static int hf_snmp_oid = -1;
static int hf_snmp_traptype = -1;
static int hf_snmp_spectraptype = -1;
static int hf_snmp_timestamp = -1;
static int hf_snmpv3_flags = -1;
static int hf_snmpv3_flags_auth = -1;
static int hf_snmpv3_flags_crypt = -1;
static int hf_snmpv3_flags_report = -1;
static int proto_smux = -1;
static gint ett_smux = -1;
static int hf_smux_version = -1;
static int hf_smux_pdutype = -1;
/* desegmentation of SNMP-over-TCP */
static gboolean snmp_desegment = TRUE;
static dissector_handle_t snmp_handle;
static dissector_handle_t data_handle;
#define TH_AUTH 0x01
#define TH_CRYPT 0x02
#define TH_REPORT 0x04
#define UDP_PORT_SNMP 161
#define UDP_PORT_SNMP_TRAP 162
#define TCP_PORT_SNMP 161
#define TCP_PORT_SNMP_TRAP 162
#define TCP_PORT_SMUX 199
/* Protocol version numbers */
#define SNMP_VERSION_1 0
#define SNMP_VERSION_2c 1
#define SNMP_VERSION_2u 2
#define SNMP_VERSION_3 3
static const value_string versions[] = {
{ SNMP_VERSION_1, "1" },
{ SNMP_VERSION_2c, "2C" },
{ SNMP_VERSION_2u, "2U" },
{ SNMP_VERSION_3, "3" },
{ 0, NULL },
};
/* defined in net-SNMP; include/net-snmp/library/snmp.h */
#undef SNMP_MSG_GET
#undef SNMP_MSG_SET
#undef SNMP_MSG_GETNEXT
#undef SNMP_MSG_RESPONSE
#undef SNMP_MSG_TRAP
#undef SNMP_MSG_GETBULK
#undef SNMP_MSG_INFORM
#undef SNMP_MSG_TRAP2
#undef SNMP_MSG_REPORT
#undef SNMP_NOSUCHOBJECT
#undef SNMP_NOSUCHINSTANCE
#undef SNMP_ENDOFMIBVIEW
/* PDU types */
#define SNMP_MSG_GET 0
#define SNMP_MSG_GETNEXT 1
#define SNMP_MSG_RESPONSE 2
#define SNMP_MSG_SET 3
#define SNMP_MSG_TRAP 4
#define SNMP_MSG_GETBULK 5
#define SNMP_MSG_INFORM 6
#define SNMP_MSG_TRAP2 7
#define SNMP_MSG_REPORT 8
static const value_string pdu_types[] = {
{ SNMP_MSG_GET, "GET" },
{ SNMP_MSG_GETNEXT, "GET-NEXT" },
{ SNMP_MSG_SET, "SET" },
{ SNMP_MSG_RESPONSE, "RESPONSE" },
{ SNMP_MSG_TRAP, "TRAP-V1" },
{ SNMP_MSG_GETBULK, "GETBULK" },
{ SNMP_MSG_INFORM, "INFORM" },
{ SNMP_MSG_TRAP2, "TRAP-V2" },
{ SNMP_MSG_REPORT, "REPORT" },
{ 0, NULL }
};
/* SMUX PDU types */
#define SMUX_MSG_OPEN 0
#define SMUX_MSG_CLOSE 1
#define SMUX_MSG_RREQ 2
#define SMUX_MSG_RRSP 3
#define SMUX_MSG_SOUT 4
static const value_string smux_types[] = {
{ SMUX_MSG_OPEN, "Open" },
{ SMUX_MSG_CLOSE, "Close" },
{ SMUX_MSG_RREQ, "Registration Request" },
{ SMUX_MSG_RRSP, "Registration Response" },
{ SMUX_MSG_SOUT, "Commit Or Rollback" },
{ 0, NULL }
};
/* SMUX Closing causes */
#define SMUX_CLOSE_DOWN 0
#define SMUX_CLOSE_VERSION 1
#define SMUX_CLOSE_PACKET 2
#define SMUX_CLOSE_PROTOCOL 3
#define SMUX_CLOSE_INTERNAL 4
#define SMUX_CLOSE_NOAUTH 5
static const value_string smux_close[] = {
{ SMUX_CLOSE_DOWN, "Going down" },
{ SMUX_CLOSE_VERSION, "Unsupported Version" },
{ SMUX_CLOSE_PACKET, "Packet Format Error" },
{ SMUX_CLOSE_PROTOCOL, "Protocol Error" },
{ SMUX_CLOSE_INTERNAL, "Internal Error" },
{ SMUX_CLOSE_NOAUTH, "Unauthorized" },
{ 0, NULL }
};
/* SMUX Request codes */
#define SMUX_RREQ_DELETE 0
#define SMUX_RREQ_READONLY 1
#define SMUX_RREQ_READWRITE 2
static const value_string smux_rreq[] = {
{ SMUX_RREQ_DELETE, "Delete" },
{ SMUX_RREQ_READONLY, "Read Only" },
{ SMUX_RREQ_READWRITE, "Read Write" },
{ 0, NULL }
};
static const value_string smux_prio[] = {
{ -1, "Failure" },
{ 0, NULL }
};
/* SMUX SOut codes */
#define SMUX_SOUT_COMMIT 0
#define SMUX_SOUT_ROLLBACK 1
static const value_string smux_sout[] = {
{ SMUX_SOUT_COMMIT, "Commit" },
{ SMUX_SOUT_ROLLBACK, "Rollback" },
{ 0, NULL }
};
/* Error status values */
#ifndef SNMP_ERR_NOERROR
#define SNMP_ERR_NOERROR 0
#endif
#ifndef SNMP_ERR_TOOBIG
#define SNMP_ERR_TOOBIG 1
#endif
#ifndef SNMP_ERR_NOSUCHNAME
#define SNMP_ERR_NOSUCHNAME 2
#endif
#ifndef SNMP_ERR_BADVALUE
#define SNMP_ERR_BADVALUE 3
#endif
#ifndef SNMP_ERR_READONLY
#define SNMP_ERR_READONLY 4
#endif
#ifndef SNMP_ERR_GENERR
#define SNMP_ERR_GENERR 5
#endif
#ifndef SNMP_ERR_NOACCESS
#define SNMP_ERR_NOACCESS 6
#endif
#ifndef SNMP_ERR_WRONGTYPE
#define SNMP_ERR_WRONGTYPE 7
#endif
#ifndef SNMP_ERR_WRONGLENGTH
#define SNMP_ERR_WRONGLENGTH 8
#endif
#ifndef SNMP_ERR_WRONGENCODING
#define SNMP_ERR_WRONGENCODING 9
#endif
#ifndef SNMP_ERR_WRONGVALUE
#define SNMP_ERR_WRONGVALUE 10
#endif
#ifndef SNMP_ERR_NOCREATION
#define SNMP_ERR_NOCREATION 11
#endif
#ifndef SNMP_ERR_INCONSISTENTVALUE
#define SNMP_ERR_INCONSISTENTVALUE 12
#endif
#ifndef SNMP_ERR_RESOURCEUNAVAILABLE
#define SNMP_ERR_RESOURCEUNAVAILABLE 13
#endif
#ifndef SNMP_ERR_COMMITFAILED
#define SNMP_ERR_COMMITFAILED 14
#endif
#ifndef SNMP_ERR_UNDOFAILED
#define SNMP_ERR_UNDOFAILED 15
#endif
#ifndef SNMP_ERR_AUTHORIZATIONERROR
#define SNMP_ERR_AUTHORIZATIONERROR 16
#endif
#ifndef SNMP_ERR_NOTWRITABLE
#define SNMP_ERR_NOTWRITABLE 17
#endif
#ifndef SNMP_ERR_INCONSISTENTNAME
#define SNMP_ERR_INCONSISTENTNAME 18
#endif
static const value_string error_statuses[] = {
{ SNMP_ERR_NOERROR, "NO ERROR" },
{ SNMP_ERR_TOOBIG, "TOOBIG" },
{ SNMP_ERR_NOSUCHNAME, "NO SUCH NAME" },
{ SNMP_ERR_BADVALUE, "BAD VALUE" },
{ SNMP_ERR_READONLY, "READ ONLY" },
{ SNMP_ERR_GENERR, "GENERIC ERROR" },
{ SNMP_ERR_NOACCESS, "NO ACCESS" },
{ SNMP_ERR_WRONGTYPE, "WRONG TYPE" },
{ SNMP_ERR_WRONGLENGTH, "WRONG LENGTH" },
{ SNMP_ERR_WRONGENCODING, "WRONG ENCODING" },
{ SNMP_ERR_WRONGVALUE, "WRONG VALUE" },
{ SNMP_ERR_NOCREATION, "NO CREATION" },
{ SNMP_ERR_INCONSISTENTVALUE, "INCONSISTENT VALUE" },
{ SNMP_ERR_RESOURCEUNAVAILABLE, "RESOURCE UNAVAILABLE" },
{ SNMP_ERR_COMMITFAILED, "COMMIT FAILED" },
{ SNMP_ERR_UNDOFAILED, "UNDO FAILED" },
{ SNMP_ERR_AUTHORIZATIONERROR, "AUTHORIZATION ERROR" },
{ SNMP_ERR_NOTWRITABLE, "NOT WRITABLE" },
{ SNMP_ERR_INCONSISTENTNAME, "INCONSISTENT NAME" },
{ 0, NULL }
};
/* General SNMP V1 Traps */
#ifndef SNMP_TRAP_COLDSTART
#define SNMP_TRAP_COLDSTART 0
#endif
#ifndef SNMP_TRAP_WARMSTART
#define SNMP_TRAP_WARMSTART 1
#endif
#ifndef SNMP_TRAP_LINKDOWN
#define SNMP_TRAP_LINKDOWN 2
#endif
#ifndef SNMP_TRAP_LINKUP
#define SNMP_TRAP_LINKUP 3
#endif
#ifndef SNMP_TRAP_AUTHFAIL
#define SNMP_TRAP_AUTHFAIL 4
#endif
#ifndef SNMP_TRAP_EGPNEIGHBORLOSS
#define SNMP_TRAP_EGPNEIGHBORLOSS 5
#endif
#ifndef SNMP_TRAP_ENTERPRISESPECIFIC
#define SNMP_TRAP_ENTERPRISESPECIFIC 6
#endif
static const value_string trap_types[] = {
{ SNMP_TRAP_COLDSTART, "COLD START" },
{ SNMP_TRAP_WARMSTART, "WARM START" },
{ SNMP_TRAP_LINKDOWN, "LINK DOWN" },
{ SNMP_TRAP_LINKUP, "LINK UP" },
{ SNMP_TRAP_AUTHFAIL, "AUTHENTICATION FAILED" },
{ SNMP_TRAP_EGPNEIGHBORLOSS, "EGP NEIGHBORLOSS" },
{ SNMP_TRAP_ENTERPRISESPECIFIC, "ENTERPRISE SPECIFIC" },
{ 0, NULL }
};
/* Security Models */
#define SNMP_SEC_ANY 0
#define SNMP_SEC_V1 1
#define SNMP_SEC_V2C 2
#define SNMP_SEC_USM 3
static const value_string sec_models[] = {
{ SNMP_SEC_ANY, "Any" },
{ SNMP_SEC_V1, "V1" },
{ SNMP_SEC_V2C, "V2C" },
{ SNMP_SEC_USM, "USM" },
{ 0, NULL }
};
/* SNMP Tags */
#define SNMP_IPA 0 /* IP Address */
#define SNMP_CNT 1 /* Counter (Counter32) */
#define SNMP_GGE 2 /* Gauge (Gauge32) */
#define SNMP_TIT 3 /* TimeTicks */
#define SNMP_OPQ 4 /* Opaque */
#define SNMP_NSP 5 /* NsapAddress */
#define SNMP_C64 6 /* Counter64 */
#define SNMP_U32 7 /* Uinteger32 */
#define SERR_NSO 0
#define SERR_NSI 1
#define SERR_EOM 2
/* SNMPv1 Types */
#define SNMP_NULL 0
#define SNMP_INTEGER 1 /* l */
#define SNMP_OCTETSTR 2 /* c */
#define SNMP_DISPLAYSTR 2 /* c */
#define SNMP_OBJECTID 3 /* ul */
#define SNMP_IPADDR 4 /* uc */
#define SNMP_COUNTER 5 /* ul */
#define SNMP_GAUGE 6 /* ul */
#define SNMP_TIMETICKS 7 /* ul */
#define SNMP_OPAQUE 8 /* c */
/* additional SNMPv2 Types */
#define SNMP_UINTEGER 5 /* ul */
#define SNMP_BITSTR 9 /* uc */
#define SNMP_NSAP 10 /* uc */
#define SNMP_COUNTER64 11 /* ul */
#define SNMP_NOSUCHOBJECT 12
#define SNMP_NOSUCHINSTANCE 13
#define SNMP_ENDOFMIBVIEW 14
typedef struct _SNMP_CNV SNMP_CNV;
struct _SNMP_CNV
{
guint class;
guint tag;
gint syntax;
gchar *name;
};
static SNMP_CNV SnmpCnv [] =
{
{ASN1_UNI, ASN1_NUL, SNMP_NULL, "NULL"},
{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(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, const char *field_name, int ret)
{
char *errstr;
errstr = asn1_err_to_str(ret);
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_fstr(pinfo->cinfo, COL_INFO,
"ERROR: Couldn't parse %s: %s", field_name, errstr);
}
if (tree != NULL) {
proto_tree_add_text(tree, tvb, offset, 0,
"ERROR: Couldn't parse %s: %s", field_name, errstr);
call_dissector(data_handle,
tvb_new_subset(tvb, offset, -1, -1), pinfo, tree);
}
}
static void
dissect_snmp_error(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, const char *message)
{
if (check_col(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO, message);
if (tree != NULL) {
proto_tree_add_text(tree, tvb, offset, 0, "%s", message);
call_dissector(data_handle,
tvb_new_subset(tvb, offset, -1, -1), pinfo, tree);
}
}
gchar *
format_oid(subid_t *oid, guint oid_length)
{
char *result;
int result_len;
int len;
unsigned int i;
char *buf;
#ifdef HAVE_SOME_SNMP
guchar *oid_string;
size_t oid_string_len;
size_t oid_out_len;
#endif
result_len = oid_length * 22;
#ifdef HAVE_SOME_SNMP
/*
* Get the decoded form of the OID, and add its length to the
* length of the result string.
*
* XXX - check for "sprint_realloc_objid()" failure.
*/
oid_string_len = 256;
oid_string = g_malloc(oid_string_len);
*oid_string = '\0';
oid_out_len = 0;
sprint_realloc_objid(&oid_string, &oid_string_len, &oid_out_len, 1,
oid, oid_length);
result_len += strlen(oid_string) + 3;
#endif
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;
}
#ifdef HAVE_SOME_SNMP
/*
* Append the decoded form of the OID.
*/
sprintf(buf, " (%s)", oid_string);
g_free(oid_string);
#endif
return result;
}
/* returns the decoded (can be NULL) and non_decoded OID strings,
returned pointers shall be freed by the caller */
void
new_format_oid(subid_t *oid, guint oid_length,
gchar **non_decoded, gchar **decoded)
{
int len;
unsigned int i;
char *buf;
#ifdef HAVE_SOME_SNMP
guchar *oid_string;
size_t oid_string_len;
size_t oid_out_len;
/*
* Get the decoded form of the OID, and add its length to the
* length of the result string.
*/
oid_string_len = 256;
oid_string = g_malloc(oid_string_len);
*oid_string = '\0';
oid_out_len = 0;
sprint_realloc_objid(&oid_string, &oid_string_len, &oid_out_len, 1,
oid, oid_length);
*decoded = oid_string;
#else
*decoded = NULL;
#endif
*non_decoded = g_malloc(oid_length * 22 + 1);
buf = *non_decoded;
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;
}
}
#ifdef HAVE_SOME_SNMP
static guchar *
check_var_length(guint vb_length, guint required_length)
{
gchar *buf;
static const char badlen_fmt[] = "Length is %u, should be %u";
if (vb_length != required_length) {
/* Enough room for the largest "Length is XXX,
should be XXX" message - 10 digits for each
XXX. */
buf = g_malloc(sizeof badlen_fmt + 10 + 10);
sprintf(buf, badlen_fmt, vb_length, required_length);
return buf;
}
return NULL; /* length is OK */
}
static gchar *
format_var(struct variable_list *variable, subid_t *variable_oid,
guint variable_oid_length, gushort vb_type, guint val_len)
{
guchar *buf;
size_t buf_len;
size_t out_len;
switch (vb_type) {
case SNMP_IPADDR:
/* Length has to be 4 bytes. */
buf = check_var_length(val_len, 4);
if (buf != NULL)
return buf; /* it's not 4 bytes */
break;
case SNMP_COUNTER64:
/* Length has to be 8 bytes. */
buf = check_var_length(val_len, 8);
if (buf != NULL)
return buf; /* it's not 8 bytes */
break;
default:
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;
break;
case SNMP_BITSTR:
variable->type = VALTYPE_BITSTR;
break;
case SNMP_COUNTER64:
variable->type = VALTYPE_COUNTER64;
break;
}
variable->val_len = val_len;
/*
* XXX - check for "sprint_realloc_objid()" failure.
*/
buf_len = 256;
buf = g_malloc(buf_len);
*buf = '\0';
out_len = 0;
sprint_realloc_value(&buf, &buf_len, &out_len, 1, variable_oid,
variable_oid_length, variable);
return buf;
}
#endif
static int
snmp_variable_decode(proto_tree *snmp_tree,
subid_t *variable_oid
#ifndef HAVE_SOME_SNMP
_U_
#endif
,
guint variable_oid_length
#ifndef HAVE_SOME_SNMP
_U_
#endif
,
ASN1_SCK *asn1, int offset, guint *lengthp)
{
int 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_SOME_SNMP
struct variable_list variable;
long value;
#else /* HAVE_SOME_SNMP */
unsigned int i;
gchar *buf;
int len;
#endif /* HAVE_SOME_SNMP */
/* parse the type of the object */
start = asn1->offset;
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->offset - start;
if (snmp_tree) {
#ifdef HAVE_SOME_SNMP
value = vb_integer_value;
variable.val.integer = &value;
vb_display_string = format_var(&variable,
variable_oid, variable_oid_length, vb_type,
vb_length);
proto_tree_add_text(snmp_tree, asn1->tvb, offset,
length,
"Value: %s", vb_display_string);
g_free(vb_display_string);
#else /* HAVE_SOME_SNMP */
proto_tree_add_text(snmp_tree, asn1->tvb, offset,
length,
"Value: %s: %d (%#x)", vb_type_name,
vb_integer_value, vb_integer_value);
#endif /* HAVE_SOME_SNMP */
}
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->offset - start;
if (snmp_tree) {
#ifdef HAVE_SOME_SNMP
value = vb_uinteger_value;
variable.val.integer = &value;
vb_display_string = format_var(&variable,
variable_oid, variable_oid_length, vb_type,
vb_length);
proto_tree_add_text(snmp_tree, asn1->tvb, offset,
length,
"Value: %s", vb_display_string);
g_free(vb_display_string);
#else /* HAVE_SOME_SNMP */
proto_tree_add_text(snmp_tree, asn1->tvb, offset,
length,
"Value: %s: %u (%#x)", vb_type_name,
vb_uinteger_value, vb_uinteger_value);
#endif /* HAVE_SOME_SNMP */
}
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->offset - start;
if (snmp_tree) {
#ifdef HAVE_SOME_SNMP
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, asn1->tvb, offset,
length,
"Value: %s", vb_display_string);
g_free(vb_display_string);
#else /* HAVE_SOME_SNMP */
/*
* 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, asn1->tvb, offset,
length,
"Value: %s: %s", vb_type_name,
vb_display_string);
g_free(vb_display_string);
} else {
proto_tree_add_text(snmp_tree, asn1->tvb, offset,
length,
"Value: %s: %s", vb_type_name,
SAFE_STRING(vb_octet_string, vb_length));
}
#endif /* HAVE_SOME_SNMP */
}
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->offset - start;
if (snmp_tree) {
proto_tree_add_text(snmp_tree, asn1->tvb, 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->offset - start;
if (snmp_tree) {
#ifdef HAVE_SOME_SNMP
variable.val.objid = vb_oid;
vb_display_string = format_var(&variable,
variable_oid, variable_oid_length, vb_type,
vb_oid_length * sizeof (subid_t));
proto_tree_add_text(snmp_tree, asn1->tvb, offset,
length,
"Value: %s", vb_display_string);
g_free(vb_display_string);
#else /* HAVE_SOME_SNMP */
vb_display_string = format_oid(vb_oid, vb_oid_length);
proto_tree_add_text(snmp_tree, asn1->tvb, offset,
length,
"Value: %s: %s", vb_type_name, vb_display_string);
g_free(vb_display_string);
#endif /* HAVE_SOME_SNMP */
}
g_free(vb_oid);
break;
case SNMP_NOSUCHOBJECT:
length = asn1->offset - start;
if (snmp_tree) {
proto_tree_add_text(snmp_tree, asn1->tvb, offset, length,
"Value: %s: no such object", vb_type_name);
}
break;
case SNMP_NOSUCHINSTANCE:
length = asn1->offset - start;
if (snmp_tree) {
proto_tree_add_text(snmp_tree, asn1->tvb, offset, length,
"Value: %s: no such instance", vb_type_name);
}
break;
case SNMP_ENDOFMIBVIEW:
length = asn1->offset - start;
if (snmp_tree) {
proto_tree_add_text(snmp_tree, asn1->tvb, 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(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, ASN1_SCK asn1, guint pdu_type, int 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;
guint32 agent_ipaddr;
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;
int ret;
guint cls, con, tag;
pdu_type_string = val_to_str(pdu_type, pdu_types,
"Unknown PDU type %#x");
if (check_col(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO, pdu_type_string);
length = asn1.offset - start;
if (tree) {
proto_tree_add_uint(tree, hf_snmp_pdutype, tvb, offset, length,
pdu_type);
}
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(tvb, offset, pinfo, tree,
"request ID", ret);
return;
}
if (tree) {
proto_tree_add_uint(tree, hf_snmp_request_id,
tvb, offset, length, 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(tvb, offset, pinfo, 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, tvb, offset,
length, "Non-repeaters: %u", error_status);
} else {
proto_tree_add_uint(tree,
hf_snmp_error_status,
tvb, offset,
length, error_status);
}
}
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(tvb, offset, pinfo, 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, tvb, offset,
length, "Max repetitions: %u", error_index);
} else {
proto_tree_add_text(tree, tvb, 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(tvb, offset, pinfo, tree,
"enterprise OID", ret);
return;
}
if (tree) {
oid_string = format_oid(enterprise, enterprise_length);
proto_tree_add_string(tree, hf_snmp_enterprise, tvb,
offset, length, oid_string);
g_free(oid_string);
}
g_free(enterprise);
offset += length;
/* agent address */
start = asn1.offset;
ret = asn1_header_decode (&asn1, &cls, &con, &tag,
&def, &agent_address_length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, 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(tvb, offset, pinfo, tree,
"agent_address", ASN1_ERR_WRONG_TYPE);
return;
}
if (agent_address_length != 4) {
dissect_snmp_parse_error(tvb, offset, pinfo, 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(tvb, offset, pinfo, tree,
"agent address", ret);
return;
}
length = asn1.offset - start;
if (tree) {
if (agent_address_length != 4) {
proto_tree_add_text(tree, tvb, offset,
length,
"Agent address: <length is %u, not 4>",
agent_address_length);
} else {
memcpy((guint8 *)&agent_ipaddr, agent_address,
agent_address_length);
proto_tree_add_ipv4(tree, hf_snmp_agent, tvb,
offset, length, agent_ipaddr);
}
}
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(tvb, offset, pinfo, tree,
"generic trap type", ret);
return;
}
if (tree) {
proto_tree_add_uint(tree, hf_snmp_traptype, tvb,
offset, length, trap_type);
}
offset += length;
/* specific trap type */
ret = asn1_uint32_decode (&asn1, &specific_type, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, tree,
"specific trap type", ret);
return;
}
if (tree) {
proto_tree_add_uint(tree, hf_snmp_spectraptype, tvb,
offset, length, specific_type);
}
offset += length;
/* timestamp */
start = asn1.offset;
ret = asn1_header_decode (&asn1, &cls, &con, &tag,
&def, &timestamp_length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, 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(tvb, offset, pinfo, tree,
"timestamp", ASN1_ERR_WRONG_TYPE);
return;
}
ret = asn1_uint32_value_decode(&asn1, timestamp_length,
&timestamp);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, tree,
"timestamp", ret);
return;
}
length = asn1.offset - start;
if (tree) {
proto_tree_add_uint(tree, hf_snmp_timestamp, tvb,
offset, length, 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(tvb, offset, pinfo, 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(tvb, offset, pinfo, 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(tvb, offset, pinfo, tree,
"variable binding OID", ret);
return;
}
sequence_length += length;
if (display_oid || tree) {
gchar *decoded_oid;
gchar *non_decoded_oid;
new_format_oid(variable_oid, variable_oid_length,
&non_decoded_oid, &decoded_oid);
if (display_oid && check_col(pinfo->cinfo, COL_INFO)) {
col_append_fstr(pinfo->cinfo, COL_INFO,
" %s",
(decoded_oid == NULL) ? non_decoded_oid :
decoded_oid);
}
if (tree) {
if (decoded_oid) {
proto_tree_add_string_format(tree, hf_snmp_oid,
tvb, offset,
sequence_length,
decoded_oid,
"Object identifier %d: %s (%s)",
vb_index,
non_decoded_oid,
decoded_oid);
/* add also the non decoded oid string */
proto_tree_add_string_hidden(tree, hf_snmp_oid,
tvb, offset,
sequence_length,
non_decoded_oid);
} else {
proto_tree_add_string_format(tree, hf_snmp_oid,
tvb, offset,
sequence_length,
non_decoded_oid,
"Object identifier %d: %s",
vb_index,
non_decoded_oid);
}
}
if (decoded_oid) g_free(decoded_oid);
g_free(non_decoded_oid);
}
offset += sequence_length;
variable_bindings_length -= sequence_length;
/*
* Register a cleanup function in case one of our
* tvbuff accesses throws an exception. We need
* to clean up variable_oid.
*/
CLEANUP_PUSH(g_free, variable_oid);
/* Parse the variable's value */
ret = snmp_variable_decode(tree, variable_oid,
variable_oid_length, &asn1, offset, &length);
/*
* We're done with variable_oid, so we can call the cleanup
* handler to free* it, and then pop the cleanup handler.
*/
CLEANUP_CALL_AND_POP;
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, 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, tvbuff_t *tvb, 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, tvb, 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, tvb, offset, 1,
"model: %u", model);
offset += 1;
parameters += 1;
parameters_length -= 1;
if (model != 1) {
/* Unknown model. */
proto_tree_add_text(parameters_tree, tvb, 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, tvb, offset, 1,
"qoS: 0x%x", qos);
qos_tree = proto_item_add_subtree(item, ett_parameters_qos);
proto_tree_add_text(qos_tree, tvb, 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, tvb, 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, tvb, 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, tvb, offset, 4,
"agentBoots: %u", pntohl(parameters));
offset += 4;
parameters += 4;
parameters_length -= 4;
if (parameters_length < 4)
return;
proto_tree_add_text(parameters_tree, tvb, offset, 4,
"agentTime: %u", pntohl(parameters));
offset += 4;
parameters += 4;
parameters_length -= 4;
if (parameters_length < 2)
return;
proto_tree_add_text(parameters_tree, tvb, 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, tvb, offset, 1,
"userLen: %u", len);
offset += 1;
parameters += 1;
parameters_length -= 1;
if (parameters_length < len)
return;
proto_tree_add_text(parameters_tree, tvb, 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, tvb, offset, 1,
"authLen: %u", len);
offset += 1;
parameters += 1;
parameters_length -= 1;
if (parameters_length < len)
return;
proto_tree_add_text(parameters_tree, tvb, 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, tvb, offset, parameters_length,
"contextSelector: %s", bytes_to_str(parameters, parameters_length));
}
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;
ASN1_SCK asn1;
int 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;
gchar *commustr;
guchar *community;
guchar *secparm;
guchar *cengineid;
guchar *cname;
guchar *cryptpdu;
guchar *aengineid;
guchar *username;
guchar *authpar;
guchar *privpar;
guint msgflags_length;
guint community_length;
guint secparm_length;
guint cengineid_length;
guint cname_length;
guint cryptpdu_length;
guint aengineid_length;
guint username_length;
guint authpar_length;
guint 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;
/*
* 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.
*/
asn1_open(&asn1, tvb, offset);
ret = asn1_sequence_decode(&asn1, &message_length, &length);
if (ret != ASN1_ERR_NOERROR) {
if (tree) {
item = proto_tree_add_item(tree, proto, tvb, offset,
-1, FALSE);
snmp_tree = proto_item_add_subtree(item, ett);
}
dissect_snmp_parse_error(tvb, offset, pinfo, snmp_tree,
"message header", ret);
/*
* Return the length remaining in the tvbuff, so
* if this is SNMP-over-TCP, our caller thinks there's
* nothing left to dissect.
*/
return length_remaining;
}
/*
* Add the length of the "Sequence Of" header to the message
* length.
*/
message_length += length;
if (message_length < length) {
/*
* The message length was probably so large that the
* total length overflowed.
*
* Report this as an error.
*/
show_reported_bounds_error(tvb, pinfo, tree);
/*
* Return the length remaining in the tvbuff, so
* if this is SNMP-over-TCP, our caller thinks there's
* nothing left to dissect.
*/
return length_remaining;
}
/*
* 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 = 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);
}
offset += length;
ret = asn1_uint32_decode (&asn1, &version, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, snmp_tree,
"version number", ret);
return message_length;
}
if (snmp_tree) {
proto_tree_add_uint(snmp_tree, hf_snmp_version, tvb, offset,
length, version);
}
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(tvb, offset, pinfo, snmp_tree,
"community", ret);
return message_length;
}
if (tree) {
commustr = g_malloc(community_length+1);
memcpy(commustr, community, community_length);
commustr[community_length] = '\0';
proto_tree_add_string(snmp_tree, hf_snmp_community,
tvb, offset, length, commustr);
g_free(commustr);
}
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, tvb, 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(tvb, offset, pinfo, snmp_tree,
"message global header", ret);
return message_length;
}
if (snmp_tree) {
item = proto_tree_add_text(snmp_tree, tvb, offset,
global_length + length, "Message Global Header");
global_tree = proto_item_add_subtree(item, ett_global);
proto_tree_add_text(global_tree, tvb, 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(tvb, offset, pinfo, snmp_tree,
"message id", ret);
return message_length;
}
if (global_tree) {
proto_tree_add_text(global_tree, tvb, offset,
length, "Message ID: %d", msgid);
}
offset += length;
ret = asn1_uint32_decode (&asn1, &msgmax, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, snmp_tree,
"message max size", ret);
return message_length;
}
if (global_tree) {
proto_tree_add_text(global_tree, tvb, 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(tvb, offset, pinfo, snmp_tree,
"message flags", ret);
return message_length;
}
if (msgflags_length != 1) {
dissect_snmp_parse_error(tvb, offset, pinfo, snmp_tree,
"message flags wrong length", ret);
g_free(msgflags);
return message_length;
}
if (global_tree) {
item = proto_tree_add_uint_format(global_tree,
hf_snmpv3_flags, tvb, 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,
tvb, offset, length, msgflags[0]);
proto_tree_add_boolean(flags_tree, hf_snmpv3_flags_crypt,
tvb, offset, length, msgflags[0]);
proto_tree_add_boolean(flags_tree, hf_snmpv3_flags_auth,
tvb, 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(tvb, offset, pinfo, snmp_tree,
"message security model", ret);
return message_length;
}
if (global_tree) {
proto_tree_add_text(global_tree, tvb, 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.offset;
ret = asn1_header_decode (&asn1, &cls, &con, &tag,
&def, &secparm_length);
length = asn1.offset - start;
if (cls != ASN1_UNI && con != ASN1_PRI &&
tag != ASN1_OTS) {
dissect_snmp_parse_error(tvb, offset, pinfo,
snmp_tree, "Message Security Parameters",
ASN1_ERR_WRONG_TYPE);
return message_length;
}
if (snmp_tree) {
item = proto_tree_add_text(snmp_tree, tvb,
offset, secparm_length + length,
"Message Security Parameters");
secur_tree = proto_item_add_subtree(item,
ett_secur);
proto_tree_add_text(secur_tree, tvb, 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(tvb, offset, pinfo,
snmp_tree, "USM sequence header", ret);
return message_length;
}
offset += length;
ret = asn1_octet_string_decode (&asn1, &aengineid,
&aengineid_length, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo,
snmp_tree, "authoritative engine id", ret);
return message_length;
}
if (secur_tree) {
proto_tree_add_text(secur_tree, tvb, 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(tvb, offset, pinfo,
snmp_tree, "engine boots", ret);
return message_length;
}
if (secur_tree) {
proto_tree_add_text(secur_tree, tvb,
offset, length, "Engine Boots: %d",
engineboots);
}
offset += length;
ret = asn1_uint32_decode (&asn1, &enginetime, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo,
snmp_tree, "engine time", ret);
return message_length;
}
if (secur_tree) {
proto_tree_add_text(secur_tree, tvb,
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(tvb, offset, pinfo,
snmp_tree, "user name", ret);
return message_length;
}
if (secur_tree) {
proto_tree_add_text(secur_tree, tvb, offset,
length, "User Name: %s",
SAFE_STRING(username, username_length));
}
g_free(username);
offset += length;
ret = asn1_octet_string_decode (&asn1, &authpar,
&authpar_length, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo,
snmp_tree, "authentication parameter", ret);
return message_length;
}
if (secur_tree) {
proto_tree_add_text(secur_tree, tvb, 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(tvb, offset, pinfo,
snmp_tree, "privacy parameter", ret);
return message_length;
}
if (secur_tree) {
proto_tree_add_text(secur_tree, tvb, 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(tvb, offset, pinfo,
snmp_tree, "Message Security Parameters",
ret);
return message_length;
}
if (snmp_tree) {
proto_tree_add_text(snmp_tree, tvb, 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(tvb, offset, pinfo,
snmp_tree, "encrypted PDU header", ret);
return message_length;
}
proto_tree_add_text(snmp_tree, tvb, offset, length,
"Encrypted PDU (%d bytes)", length);
g_free(cryptpdu);
if (check_col(pinfo->cinfo, COL_INFO))
col_set_str(pinfo->cinfo, COL_INFO, "Encrypted PDU");
return message_length;
}
ret = asn1_sequence_decode(&asn1, &global_length, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, snmp_tree,
"PDU header", ret);
return message_length;
}
offset += length;
ret = asn1_octet_string_decode (&asn1, &cengineid,
&cengineid_length, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, snmp_tree,
"context engine id", ret);
return message_length;
}
if (snmp_tree) {
proto_tree_add_text(snmp_tree, tvb, 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(tvb, offset, pinfo, snmp_tree,
"context name", ret);
return message_length;
}
if (snmp_tree) {
proto_tree_add_text(snmp_tree, tvb, offset, length,
"Context Name: %s",
SAFE_STRING(cname, cname_length));
}
g_free(cname);
offset += length;
break;
default:
dissect_snmp_error(tvb, offset, pinfo, snmp_tree,
"PDU for unknown version of SNMP");
return message_length;
}
start = asn1.offset;
ret = asn1_header_decode (&asn1, &cls, &con, &pdu_type, &def,
&pdu_length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, snmp_tree,
"PDU type", ret);
return message_length;
}
if (cls != ASN1_CTX || con != ASN1_CON) {
dissect_snmp_parse_error(tvb, offset, pinfo, snmp_tree,
"PDU type", ASN1_ERR_WRONG_TYPE);
return message_length;
}
dissect_common_pdu(tvb, offset, pinfo, snmp_tree, asn1, pdu_type, start);
return message_length;
}
static void
dissect_smux_pdu(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, int proto, gint ett)
{
ASN1_SCK asn1;
int 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;
guint password_length;
guchar *application;
guint 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(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMUX");
if (tree) {
item = proto_tree_add_item(tree, proto, tvb, offset, -1, 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, tvb, offset);
start = asn1.offset;
ret = asn1_header_decode (&asn1, &cls, &con, &pdu_type, &def,
&pdu_length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, smux_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(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO, pdu_type_string);
length = asn1.offset - start;
if (tree) {
proto_tree_add_uint(smux_tree, hf_smux_pdutype, tvb,
offset, length, pdu_type);
}
offset += length;
ret = asn1_uint32_decode (&asn1, &version, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, smux_tree,
"version", ret);
return;
}
if (tree) {
proto_tree_add_uint(smux_tree, hf_smux_version, tvb,
offset, length, version);
}
offset += length;
ret = asn1_oid_decode (&asn1, &regid, &regid_length, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, smux_tree,
"registration OID", ret);
return;
}
if (tree) {
oid_string = format_oid(regid, regid_length);
proto_tree_add_text(smux_tree, tvb, 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(tvb, offset, pinfo, smux_tree,
"application", ret);
return;
}
if (tree) {
proto_tree_add_text(smux_tree, tvb, offset, length,
"Application: %s",
SAFE_STRING(application, application_length));
}
g_free(application);
offset += length;
ret = asn1_octet_string_decode (&asn1, &password,
&password_length, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, smux_tree,
"password", ret);
return;
}
if (tree) {
proto_tree_add_text(smux_tree, tvb, offset, length,
"Password: %s",
SAFE_STRING(password, password_length));
}
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(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO, pdu_type_string);
length = asn1.offset - start;
if (tree) {
proto_tree_add_uint(smux_tree, hf_smux_pdutype, tvb,
offset, length, pdu_type);
}
offset += length;
ret = asn1_uint32_value_decode (&asn1, pdu_length, &cause);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, smux_tree,
"cause", ret);
return;
}
if (tree) {
proto_tree_add_text(smux_tree, tvb, 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(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO, pdu_type_string);
length = asn1.offset - start;
if (tree) {
proto_tree_add_uint(smux_tree, hf_smux_pdutype, tvb,
offset, length, pdu_type);
}
offset += length;
ret = asn1_oid_decode (&asn1, &regid, &regid_length, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, smux_tree,
"registration subtree", ret);
return;
}
if (tree) {
oid_string = format_oid(regid, regid_length);
proto_tree_add_text(smux_tree, tvb, 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(tvb, offset, pinfo, smux_tree,
"priority", ret);
return;
}
if (tree) {
proto_tree_add_text(smux_tree, tvb, offset, length,
"Priority: %d", priority);
}
offset += length;
ret = asn1_uint32_decode (&asn1, &operation, &length);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, smux_tree,
"operation", ret);
return;
}
if (tree) {
proto_tree_add_text(smux_tree, tvb, 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(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO, pdu_type_string);
length = asn1.offset - start;
if (tree) {
proto_tree_add_uint(smux_tree, hf_smux_pdutype, tvb,
offset, length, pdu_type);
}
offset += length;
ret = asn1_uint32_value_decode (&asn1, pdu_length, &priority);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, smux_tree,
"priority", ret);
return;
}
if (tree) {
proto_tree_add_text(smux_tree, tvb, 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(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO, pdu_type_string);
length = asn1.offset - start;
if (tree) {
proto_tree_add_uint(smux_tree, hf_smux_pdutype, tvb,
offset, length, pdu_type);
}
offset += length;
ret = asn1_uint32_value_decode (&asn1, pdu_length, &commit);
if (ret != ASN1_ERR_NOERROR) {
dissect_snmp_parse_error(tvb, offset, pinfo, smux_tree,
"commit", ret);
return;
}
if (tree) {
proto_tree_add_text(smux_tree, tvb, 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(tvb, offset, pinfo, smux_tree,
"PDU type", ASN1_ERR_WRONG_TYPE);
return;
}
dissect_common_pdu(tvb, offset, pinfo, smux_tree, asn1, pdu_type, start);
}
static void
dissect_snmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
conversation_t *conversation;
/*
* 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->src, &pinfo->dst, PT_UDP,
pinfo->srcport, 0, NO_PORT_B);
if (conversation == NULL) {
conversation = conversation_new(&pinfo->src, &pinfo->dst, PT_UDP,
pinfo->srcport, 0, NO_PORT2);
conversation_set_dissector(conversation, snmp_handle);
}
}
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(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);
#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 */
}
void
proto_register_snmp(void)
{
#if defined(WIN32) && defined(HAVE_SOME_SNMP)
char *mib_path;
#define MIB_PATH_APPEND "snmp\\mibs"
#endif
gchar *tmp_mib_modules;
static hf_register_info hf[] = {
{ &hf_snmp_version,
{ "Version", "snmp.version", FT_UINT8, BASE_DEC, VALS(versions),
0x0, "", HFILL }},
{ &hf_snmp_community,
{ "Community", "snmp.community", FT_STRING, BASE_NONE, NULL,
0x0, "", HFILL }},
{ &hf_snmp_request_id,
{ "Request Id", "snmp.id", FT_UINT32, BASE_HEX, NULL,
0x0, "Id for this transaction", HFILL }},
{ &hf_snmp_pdutype,
{ "PDU type", "snmp.pdutype", FT_UINT8, BASE_DEC, VALS(pdu_types),
0x0, "", HFILL }},
{ &hf_snmp_agent,
{ "Agent address", "snmp.agent", FT_IPv4, BASE_NONE, NULL,
0x0, "", HFILL }},
{ &hf_snmp_enterprise,
{ "Enterprise", "snmp.enterprise", FT_STRING, BASE_NONE, NULL,
0x0, "", HFILL }},
{ &hf_snmp_error_status,
{ "Error Status", "snmp.error", FT_UINT8, BASE_DEC, VALS(error_statuses),
0x0, "", HFILL }},
{ &hf_snmp_oid,
{ "Object identifier", "snmp.oid", FT_STRING, BASE_NONE, NULL,
0x0, "", HFILL }},
{ &hf_snmp_traptype,
{ "Trap type", "snmp.traptype", FT_UINT8, BASE_DEC, VALS(trap_types),
0x0, "", HFILL }},
{ &hf_snmp_spectraptype,
{ "Specific trap type", "snmp.spectraptype", FT_UINT32, BASE_DEC, NULL,
0x0, "", HFILL }},
{ &hf_snmp_timestamp,
{ "Timestamp", "snmp.timestamp", FT_UINT8, BASE_DEC, NULL,
0x0, "", HFILL }},
{ &hf_snmpv3_flags,
{ "SNMPv3 Flags", "snmpv3.flags", FT_UINT8, BASE_HEX, NULL,
0x0, "", HFILL }},
{ &hf_snmpv3_flags_auth,
{ "Authenticated", "snmpv3.flags.auth", FT_BOOLEAN, 8,
TFS(&flags_set_truth), TH_AUTH, "", HFILL }},
{ &hf_snmpv3_flags_crypt,
{ "Encrypted", "snmpv3.flags.crypt", FT_BOOLEAN, 8,
TFS(&flags_set_truth), TH_CRYPT, "", HFILL }},
{ &hf_snmpv3_flags_report,
{ "Reportable", "snmpv3.flags.report", FT_BOOLEAN, 8,
TFS(&flags_set_truth), TH_REPORT, "", HFILL }},
};
static gint *ett[] = {
&ett_snmp,
&ett_parameters,
&ett_parameters_qos,
&ett_global,
&ett_flags,
&ett_secur,
};
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 = g_malloc (strlen(get_datafile_dir()) + strlen(MIB_PATH_APPEND) + 20);
sprintf (mib_path, "MIBDIRS=%s\\%s", get_datafile_dir(), MIB_PATH_APPEND);
/* Amazingly enough, Windows does not provide setenv(). */
if (getenv("MIBDIRS") == NULL)
_putenv(mib_path);
g_free(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 */
proto_snmp = proto_register_protocol("Simple Network Management Protocol",
"SNMP", "snmp");
proto_register_field_array(proto_snmp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
snmp_handle = create_dissector_handle(dissect_snmp, proto_snmp);
/* 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)",
&mib_modules);
prefs_register_bool_preference(snmp_module, "desegment",
"Desegment all SNMP-over-TCP messages\nspanning multiple TCP segments",
"Whether the SNMP dissector should desegment all messages "
"spanning multiple TCP segments",
&snmp_desegment);
}
void
proto_reg_handoff_snmp(void)
{
dissector_handle_t snmp_tcp_handle;
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));
}
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);
}
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