2 * Routines for SNMP (simple network management protocol)
3 * Copyright (C) 1998 Didier Jorand
5 * See RFC 1157 for SNMPv1.
7 * See RFCs 1901, 1905, and 1906 for SNMPv2c.
9 * See RFCs 1905, 1906, 1909, and 1910 for SNMPv2u [historic].
11 * See RFCs 2570-2576 for SNMPv3
12 * Updated to use the asn2wrs compiler made by Tomas Kukosa
13 * Copyright (C) 2005 - 2006 Anders Broman [AT] ericsson.com
15 * See RFC 3414 for User-based Security Model for SNMPv3
16 * See RFC 3826 for (AES) Cipher Algorithm in the SNMP USM
17 * See RFC 2578 for Structure of Management Information Version 2 (SMIv2)
18 * Copyright (C) 2007 Luis E. Garcia Ontanon <luis.ontanon@gmail.com>
22 * Wireshark - Network traffic analyzer
23 * By Gerald Combs <gerald@wireshark.org>
24 * Copyright 1998 Gerald Combs
28 * GXSNMP -- An snmp mangament application
29 * Copyright (C) 1998 Gregory McLean & Jochen Friedrich
30 * Beholder RMON ethernet network monitor,Copyright (C) 1993 DNPAP group
32 * This program is free software; you can redistribute it and/or
33 * modify it under the terms of the GNU General Public License
34 * as published by the Free Software Foundation; either version 2
35 * of the License, or (at your option) any later version.
37 * This program is distributed in the hope that it will be useful,
38 * but WITHOUT ANY WARRANTY; without even the implied warranty of
39 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
40 * GNU General Public License for more details.
42 * You should have received a copy of the GNU General Public License
43 * along with this program; if not, write to the Free Software
44 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
47 #define D(args) do {printf args; fflush(stdout); } while(0)
59 #include <epan/packet.h>
60 #include <epan/strutil.h>
61 #include <epan/conversation.h>
63 #include <epan/prefs.h>
64 #include <epan/sminmpec.h>
65 #include <epan/emem.h>
66 #include <epan/next_tvb.h>
68 #include <epan/asn1.h>
69 #include "packet-ipx.h"
70 #include "packet-hpext.h"
73 #include "packet-ber.h"
75 #include "packet-snmp.h"
77 #include <epan/crypt/crypt-sha1.h>
78 #include <epan/crypt/crypt-md5.h>
79 #include <epan/expert.h>
80 #include <epan/report_err.h>
81 #include <epan/oids.h>
86 #include <winposixtype.h>
91 /* Take a pointer that may be null and return a pointer that's not null
92 by turning null pointers into pointers to the above null string,
93 and, if the argument pointer wasn't null, make sure we handle
94 non-printable characters in the string by escaping them. */
95 #define SAFE_STRING(s, l) (((s) != NULL) ? format_text((s), (l)) : "")
97 #define PNAME "Simple Network Management Protocol"
101 #define UDP_PORT_SNMP 161
102 #define UDP_PORT_SNMP_TRAP 162
103 #define TCP_PORT_SNMP 161
104 #define TCP_PORT_SNMP_TRAP 162
105 #define TCP_PORT_SMUX 199
106 #define UDP_PORT_SNMP_PATROL 8161
108 /* Initialize the protocol and registered fields */
109 static int proto_snmp = -1;
110 static int proto_smux = -1;
112 static gboolean display_oid = TRUE;
113 static gboolean snmp_var_in_tree = TRUE;
115 static gboolean snmp_usm_auth_md5(snmp_usm_params_t* p, guint8**, guint*, gchar const**);
116 static gboolean snmp_usm_auth_sha1(snmp_usm_params_t* p, guint8**, guint*, gchar const**);
118 static tvbuff_t* snmp_usm_priv_des(snmp_usm_params_t*, tvbuff_t*, gchar const**);
119 static tvbuff_t* snmp_usm_priv_aes(snmp_usm_params_t*, tvbuff_t*, gchar const**);
122 static void snmp_usm_password_to_key_md5(const guint8 *password, guint passwordlen, const guint8 *engineID, guint engineLength, guint8 *key);
123 static void snmp_usm_password_to_key_sha1(const guint8 *password, guint passwordlen, const guint8 *engineID, guint engineLength, guint8 *key);
126 static snmp_usm_auth_model_t model_md5 = {snmp_usm_password_to_key_md5, snmp_usm_auth_md5, 16};
127 static snmp_usm_auth_model_t model_sha1 = {snmp_usm_password_to_key_sha1, snmp_usm_auth_sha1, 20};
129 static value_string auth_types[] = {
134 static snmp_usm_auth_model_t* auth_models[] = {&model_md5,&model_sha1};
137 static value_string priv_types[] = {
142 static snmp_usm_decoder_t priv_protos[] = {snmp_usm_priv_des, snmp_usm_priv_aes};
144 static snmp_ue_assoc_t* ueas = NULL;
145 static guint num_ueas = 0;
146 static uat_t* assocs_uat = NULL;
147 static snmp_ue_assoc_t* localized_ues = NULL;
148 static snmp_ue_assoc_t* unlocalized_ues = NULL;
153 static snmp_usm_params_t usm_p = {FALSE,FALSE,0,0,0,0,NULL,NULL,NULL,NULL,NULL,NULL,NULL,FALSE};
156 #define TH_CRYPT 0x02
157 #define TH_REPORT 0x04
159 /* desegmentation of SNMP-over-TCP */
160 static gboolean snmp_desegment = TRUE;
162 /* Global variables */
164 guint32 MsgSecurityModel;
165 tvbuff_t *oid_tvb=NULL;
166 tvbuff_t *value_tvb=NULL;
168 static dissector_handle_t snmp_handle;
169 static dissector_handle_t data_handle;
171 static next_tvb_list_t var_list;
173 static int hf_snmp_v3_flags_auth = -1;
174 static int hf_snmp_v3_flags_crypt = -1;
175 static int hf_snmp_v3_flags_report = -1;
177 static int hf_snmp_engineid_conform = -1;
178 static int hf_snmp_engineid_enterprise = -1;
179 static int hf_snmp_engineid_format = -1;
180 static int hf_snmp_engineid_ipv4 = -1;
181 static int hf_snmp_engineid_ipv6 = -1;
182 static int hf_snmp_engineid_mac = -1;
183 static int hf_snmp_engineid_text = -1;
184 static int hf_snmp_engineid_time = -1;
185 static int hf_snmp_engineid_data = -1;
186 static int hf_snmp_decryptedPDU = -1;
187 static int hf_snmp_msgAuthentication = -1;
189 static int hf_snmp_noSuchObject = -1;
190 static int hf_snmp_noSuchInstance = -1;
191 static int hf_snmp_endOfMibView = -1;
192 static int hf_snmp_unSpecified = -1;
194 static int hf_snmp_integer32_value = -1;
195 static int hf_snmp_octetstring_value = -1;
196 static int hf_snmp_oid_value = -1;
197 static int hf_snmp_null_value = -1;
198 static int hf_snmp_ipv4_value = -1;
199 static int hf_snmp_ipv6_value = -1;
200 static int hf_snmp_anyaddress_value = -1;
201 static int hf_snmp_unsigned32_value = -1;
202 static int hf_snmp_unknown_value = -1;
203 static int hf_snmp_opaque_value = -1;
204 static int hf_snmp_nsap_value = -1;
205 static int hf_snmp_counter_value = -1;
206 static int hf_snmp_timeticks_value = -1;
207 static int hf_snmp_big_counter_value = -1;
208 static int hf_snmp_gauge32_value = -1;
210 static int hf_snmp_objectname = -1;
211 static int hf_snmp_scalar_instance_index = -1;
214 #include "packet-snmp-hf.c"
216 static int hf_smux_version = -1;
217 static int hf_smux_pdutype = -1;
219 /* Initialize the subtree pointers */
220 static gint ett_smux = -1;
221 static gint ett_snmp = -1;
222 static gint ett_engineid = -1;
223 static gint ett_msgFlags = -1;
224 static gint ett_encryptedPDU = -1;
225 static gint ett_decrypted = -1;
226 static gint ett_authParameters = -1;
227 static gint ett_internet = -1;
228 static gint ett_varbind = -1;
229 static gint ett_name = -1;
230 static gint ett_value = -1;
231 static gint ett_decoding_error = -1;
233 #include "packet-snmp-ett.c"
235 static const true_false_string auth_flags = {
240 /* Security Models */
242 #define SNMP_SEC_ANY 0
243 #define SNMP_SEC_V1 1
244 #define SNMP_SEC_V2C 2
245 #define SNMP_SEC_USM 3
247 static const value_string sec_models[] = {
248 { SNMP_SEC_ANY, "Any" },
249 { SNMP_SEC_V1, "V1" },
250 { SNMP_SEC_V2C, "V2C" },
251 { SNMP_SEC_USM, "USM" },
256 #define SMUX_MSG_OPEN 0
257 #define SMUX_MSG_CLOSE 1
258 #define SMUX_MSG_RREQ 2
259 #define SMUX_MSG_RRSP 3
260 #define SMUX_MSG_SOUT 4
262 static const value_string smux_types[] = {
263 { SMUX_MSG_OPEN, "Open" },
264 { SMUX_MSG_CLOSE, "Close" },
265 { SMUX_MSG_RREQ, "Registration Request" },
266 { SMUX_MSG_RRSP, "Registration Response" },
267 { SMUX_MSG_SOUT, "Commit Or Rollback" },
272 #define SNMP_IPA 0 /* IP Address */
273 #define SNMP_CNT 1 /* Counter (Counter32) */
274 #define SNMP_GGE 2 /* Gauge (Gauge32) */
275 #define SNMP_TIT 3 /* TimeTicks */
276 #define SNMP_OPQ 4 /* Opaque */
277 #define SNMP_NSP 5 /* NsapAddress */
278 #define SNMP_C64 6 /* Counter64 */
279 #define SNMP_U32 7 /* Uinteger32 */
286 dissector_table_t value_sub_dissectors_table;
289 * dissect_snmp_VarBind
290 * this routine dissects variable bindings, looking for the oid information in our oid reporsitory
291 * to format and add the value adequatelly.
293 * The choice to handwrite this code instead of using the asn compiler is to avoid having tons
294 * of uses of global variables distributed in very different parts of the code.
295 * Other than that there's a cosmetic thing: the tree from ASN generated code would be so
296 * convoluted due to the nesting of CHOICEs in the definition of VarBind/value.
298 * XXX: the length of this function (~400 lines) is an aberration!
299 * oid_key_t:key_type could become a series of callbacks instead of an enum
300 * the (! oid_info_is_ok) switch could be made into an array (would be slower)
303 NetworkAddress ::= CHOICE { internet IpAddress }
304 IpAddress ::= [APPLICATION 0] IMPLICIT OCTET STRING (SIZE (4))
305 TimeTicks ::= [APPLICATION 3] IMPLICIT INTEGER (0..4294967295)
306 Integer32 ::= INTEGER (-2147483648..2147483647)
307 ObjectName ::= OBJECT IDENTIFIER
308 Counter32 ::= [APPLICATION 1] IMPLICIT INTEGER (0..4294967295)
309 Gauge32 ::= [APPLICATION 2] IMPLICIT INTEGER (0..4294967295)
310 Unsigned32 ::= [APPLICATION 2] IMPLICIT INTEGER (0..4294967295)
311 Integer-value ::= INTEGER (-2147483648..2147483647)
312 Integer32 ::= INTEGER (-2147483648..2147483647)
313 ObjectID-value ::= OBJECT IDENTIFIER
315 TimeTicks ::= [APPLICATION 3] IMPLICIT INTEGER (0..4294967295)
316 Opaque ::= [APPLICATION 4] IMPLICIT OCTET STRING
317 Counter64 ::= [APPLICATION 6] IMPLICIT INTEGER (0..18446744073709551615)
319 ObjectSyntax ::= CHOICE {
321 application-wide ApplicationSyntax
324 SimpleSyntax ::= CHOICE {
325 integer-value Integer-value,
326 string-value String-value,
327 objectID-value ObjectID-value,
331 ApplicationSyntax ::= CHOICE {
332 ipAddress-value IpAddress,
333 counter-value Counter32,
334 timeticks-value TimeTicks,
335 arbitrary-value Opaque,
336 big-counter-value Counter64,
337 unsigned-integer-value Unsigned32
340 ValueType ::= CHOICE {
343 noSuchObject[0] IMPLICIT NULL,
344 noSuchInstance[1] IMPLICIT NULL,
345 endOfMibView[2] IMPLICIT NULL
348 VarBind ::= SEQUENCE {
355 extern int dissect_snmp_VarBind(gboolean implicit_tag _U_,
361 int seq_offset, name_offset, value_offset, value_start;
362 guint32 seq_len, name_len, value_len;
369 oid_info_t* oid_info = NULL;
370 guint oid_matched, oid_left;
371 proto_item *pi_name, *pi_varbind, *pi_value = NULL;
372 proto_tree *pt, *pt_varbind, *pt_name, *pt_value;
373 char label[ITEM_LABEL_LENGTH];
375 const char* info_oid = NULL;
378 int min_len = 0, max_len = 0;
379 gboolean oid_info_is_ok;
380 const char* oid_string = NULL;
381 enum {BER_NO_ERROR, BER_WRONG_LENGTH, BER_WRONG_TAG} format_error = BER_NO_ERROR;
385 /* first have the VarBind's sequence header */
386 offset = get_ber_identifier(tvb, offset, &ber_class, &pc, &tag);
387 offset = get_ber_length(tvb, offset, &seq_len, &ind);
389 seq_len += offset - seq_offset;
391 if (!pc && ber_class==BER_CLASS_UNI && tag==BER_UNI_TAG_SEQUENCE) {
392 proto_item* pi = proto_tree_add_text(tree, tvb, seq_offset, seq_len,"VarBind must be an universal class sequence");
393 pt = proto_item_add_subtree(pi,ett_decoding_error);
394 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "VarBind is not an universal class sequence");
395 return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
399 proto_item* pi = proto_tree_add_text(tree, tvb, seq_offset, seq_len,"Indicator must be clear in VarBind");
400 pt = proto_item_add_subtree(pi,ett_decoding_error);
401 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "VarBind has indicator set");
402 return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
405 /* then we have the ObjectName's header */
407 offset = get_ber_identifier(tvb, offset, &ber_class, &pc, &tag);
408 name_offset = offset = get_ber_length(tvb, offset, &name_len, &ind);
410 if (! ( !pc && ber_class==BER_CLASS_UNI && tag==BER_UNI_TAG_OID) ) {
411 proto_item* pi = proto_tree_add_text(tree, tvb, seq_offset, seq_len,"ObjectName must be an OID in primitive encoding");
412 pt = proto_item_add_subtree(pi,ett_decoding_error);
413 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "ObjectName not an OID");
414 return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
418 proto_item* pi = proto_tree_add_text(tree, tvb, seq_offset, seq_len,"Indicator must be clear in ObjectName");
419 pt = proto_item_add_subtree(pi,ett_decoding_error);
420 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "ObjectName has indicator set");
421 return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
425 value_start = offset;
427 /* then we have the value's header */
428 offset = get_ber_identifier(tvb, offset, &ber_class, &pc, &tag);
429 value_offset = offset = get_ber_length(tvb, offset, &value_len, &ind);
432 proto_item* pi = proto_tree_add_text(tree, tvb, seq_offset, seq_len,"the value must be in primitive encoding");
433 pt = proto_item_add_subtree(pi,ett_decoding_error);
434 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "value not in primitive encoding");
435 return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
438 /* Now, we know where everithing is */
442 /* we add the varbind tree root with a dummy label we'll fill later on */
443 pi_varbind = proto_tree_add_text(tree,tvb,seq_offset,seq_len,"VarBind");
444 pt_varbind = proto_item_add_subtree(pi_varbind,ett_varbind);
447 pi_name = proto_tree_add_item(pt_varbind,hf_snmp_objectname,tvb,name_offset,name_len,FALSE);
448 pt_name = proto_item_add_subtree(pi_name,ett_name);
450 /* fetch ObjectName and its relative oid_info */
451 oid_bytes = ep_tvb_memdup(tvb, name_offset, name_len);
452 oid_info = oid_get_from_encoded(oid_bytes, name_len, &subids, &oid_matched, &oid_left);
454 add_oid_debug_subtree(oid_info,pt_name);
456 if (subids && oid_matched+oid_left) {
457 oid_string = oid_subid2string(subids,oid_matched+oid_left);
460 if (ber_class == BER_CLASS_CON) {
461 /* if we have an error value just add it and get out the way ASAP */
465 if (value_len != 0) {
466 min_len = max_len = 0;
467 format_error = BER_WRONG_LENGTH;
472 hfid = hf_snmp_noSuchObject;
473 note = "noSuchObject";
476 hfid = hf_snmp_noSuchInstance;
477 note = "noSuchInstance";
480 hfid = hf_snmp_endOfMibView;
481 note = "endOfMibView";
484 pi = proto_tree_add_text(pt_varbind,tvb,0,0,"Wrong tag for Error Value: expected 0, 1, or 2 but got: %d",tag);
485 pt = proto_item_add_subtree(pi,ett_decoding_error);
486 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "Wrong tag for SNMP VarBind error value");
487 return dissect_unknown_ber(actx->pinfo, tvb, value_start, pt);
491 pi = proto_tree_add_item(pt_varbind,hfid,tvb,value_offset,value_len,FALSE);
492 expert_add_info_format(actx->pinfo, pi, PI_RESPONSE_CODE, PI_NOTE, "%s",note);
493 g_strlcpy (label, note, ITEM_LABEL_LENGTH);
497 /* now we'll try to figure out which are the indexing sub-oids and whether the oid we know about is the one oid we have to use */
498 switch (oid_info->kind) {
499 case OID_KIND_SCALAR:
501 /* OK: we got the instance sub-id */
502 proto_tree_add_uint64(pt_name,hf_snmp_scalar_instance_index,tvb,name_offset,name_len,subids[oid_matched]);
503 oid_info_is_ok = TRUE;
505 } else if (oid_left == 0) {
506 if (ber_class == BER_CLASS_UNI && tag == BER_UNI_TAG_NULL) {
507 /* unSpecified does not require an instance sub-id add the new value and get off the way! */
508 pi_value = proto_tree_add_item(pt_varbind,hf_snmp_unSpecified,tvb,value_offset,value_len,FALSE);
511 proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"A scalar should have one instance sub-id this one has none");
512 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "No instance sub-id in scalar value");
513 oid_info_is_ok = FALSE;
517 proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"A scalar should have only one instance sub-id this has: %d",oid_left);
518 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "Wrong number of instance sub-ids in scalar value");
519 oid_info_is_ok = FALSE;
523 case OID_KIND_COLUMN:
524 if ( oid_info->parent->kind == OID_KIND_ROW) {
525 oid_key_t* k = oid_info->parent->key;
526 guint key_start = oid_matched;
527 guint key_len = oid_left;
528 oid_info_is_ok = TRUE;
530 if ( key_len == 0 && ber_class == BER_CLASS_UNI && tag == BER_UNI_TAG_NULL) {
531 /* unSpecified does not require an instance sub-id add the new value and get off the way! */
532 pi_value = proto_tree_add_item(pt_varbind,hf_snmp_unSpecified,tvb,value_offset,value_len,FALSE);
537 for (;k;k = k->next) {
540 if (key_start >= oid_matched+oid_left) {
541 proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"index sub-oid shorter than expected");
542 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "index sub-oid shorter than expected");
543 oid_info_is_ok = FALSE;
547 switch(k->key_type) {
548 case OID_KEY_TYPE_WRONG: {
549 proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"OID instaces not handled, if you want this implemented please contact the wireshark developpers");
550 expert_add_info_format(actx->pinfo, pi, PI_UNDECODED, PI_WARN, "Unimplemented instance index");
551 oid_info_is_ok = FALSE;
554 case OID_KEY_TYPE_INTEGER: {
555 if (IS_FT_INT(k->ft_type)) {
556 proto_tree_add_int(pt_name,k->hfid,tvb,name_offset,name_len,(guint)subids[key_start]);
557 } else { /* if it's not an unsigned int let proto_tree_add_uint throw a warning */
558 proto_tree_add_uint(pt_name,k->hfid,tvb,name_offset,name_len,(guint)subids[key_start]);
562 continue; /* k->next */
564 case OID_KEY_TYPE_IMPLIED_OID:
565 suboid_len = key_len;
569 case OID_KEY_TYPE_OID: {
571 guint suboid_buf_len;
574 suboid_len = subids[key_start++];
578 suboid = &(subids[key_start]);
580 if( suboid_len == 0 ) {
581 proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"an index sub-oid OID cannot be 0 bytes long!");
582 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "index sub-oid OID with len=0");
583 oid_info_is_ok = FALSE;
587 if( key_len < suboid_len ) {
588 proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"index sub-oid should not be longer than remaining oid size");
589 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "index sub-oid longer than remaining oid size");
590 oid_info_is_ok = FALSE;
594 suboid_buf_len = oid_subid2encoded(suboid_len, suboid, &suboid_buf);
596 DISSECTOR_ASSERT(suboid_buf_len);
598 proto_tree_add_oid(pt_name,k->hfid,tvb,name_offset, suboid_buf_len, suboid_buf);
600 key_start += suboid_len;
601 key_len -= suboid_len + 1;
602 continue; /* k->next */
611 switch (k->key_type) {
612 case OID_KEY_TYPE_IPADDR:
613 suboid = &(subids[key_start]);
616 case OID_KEY_TYPE_IMPLIED_STRING:
617 case OID_KEY_TYPE_IMPLIED_BYTES:
618 suboid = &(subids[key_start]);
622 buf_len = k->num_subids;
623 suboid = &(subids[key_start]);
633 if( key_len < buf_len ) {
634 proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"index string should not be longer than remaining oid size");
635 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "index string longer than remaining oid size");
636 oid_info_is_ok = FALSE;
640 buf = ep_alloc(buf_len+1);
641 for (i = 0; i < buf_len; i++)
642 buf[i] = (guint8)suboid[i];
645 switch(k->key_type) {
646 case OID_KEY_TYPE_STRING:
647 case OID_KEY_TYPE_IMPLIED_STRING:
648 proto_tree_add_string(pt_name,k->hfid,tvb,name_offset,buf_len, buf);
650 case OID_KEY_TYPE_BYTES:
651 case OID_KEY_TYPE_NSAP:
652 case OID_KEY_TYPE_IMPLIED_BYTES:
653 proto_tree_add_bytes(pt_name,k->hfid,tvb,name_offset,buf_len, buf);
655 case OID_KEY_TYPE_IPADDR: {
656 guint32* ipv4_p = (void*)buf;
657 proto_tree_add_ipv4(pt_name,k->hfid,tvb,name_offset,buf_len, *ipv4_p);
660 DISSECTOR_ASSERT_NOT_REACHED();
665 key_start += buf_len;
667 continue; /* k->next*/
673 proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"We do not know how to handle this OID, if you want this implemented please contact the wireshark developers");
674 expert_add_info_format(actx->pinfo, pi, PI_UNDECODED, PI_WARN, "Unimplemented instance index");
675 oid_info_is_ok = FALSE;
679 proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"The COLUMS's parent is not a ROW. This is a BUG! please contact the wireshark developers.");
680 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_ERROR, "COLUMS's parent is not a ROW");
681 oid_info_is_ok = FALSE;
685 /* proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"This kind OID should have no value");
686 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "This kind OID should have no value"); */
687 oid_info_is_ok = FALSE;
693 if (oid_info_is_ok) {
694 if (ber_class == BER_CLASS_UNI && tag == BER_UNI_TAG_NULL) {
695 pi_value = proto_tree_add_item(pt_varbind,hf_snmp_unSpecified,tvb,value_offset,value_len,FALSE);
697 if ((oid_info->value_type->ber_class != BER_CLASS_ANY) &&
698 (ber_class != oid_info->value_type->ber_class))
699 format_error = BER_WRONG_TAG;
701 if ((oid_info->value_type->ber_tag != BER_TAG_ANY) &&
702 (tag != oid_info->value_type->ber_tag))
703 format_error = BER_WRONG_TAG;
705 max_len = oid_info->value_type->max_len == -1 ? 0xffffff : oid_info->value_type->max_len;
706 min_len = oid_info->value_type->min_len;
708 if ((int)value_len < min_len || (int)value_len > max_len)
709 format_error = BER_WRONG_LENGTH;
711 pi_value = proto_tree_add_item(pt_varbind,oid_info->value_hfid,tvb,value_offset,value_len,FALSE);
714 switch(ber_class|(tag<<4)) {
715 case BER_CLASS_UNI|(BER_UNI_TAG_INTEGER<<4):
716 max_len = 4; min_len = 1;
717 if (value_len > (guint)max_len && value_len < (guint)min_len) format_error = BER_WRONG_LENGTH;
718 hfid = hf_snmp_integer32_value;
720 case BER_CLASS_UNI|(BER_UNI_TAG_OCTETSTRING<<4):
721 hfid = hf_snmp_octetstring_value;
723 case BER_CLASS_UNI|(BER_UNI_TAG_OID<<4):
724 max_len = -1; min_len = 1;
725 if (value_len < (guint)min_len) format_error = BER_WRONG_LENGTH;
726 hfid = hf_snmp_oid_value;
728 case BER_CLASS_UNI|(BER_UNI_TAG_NULL<<4):
729 max_len = 0; min_len = 0;
730 if (value_len != 0) format_error = BER_WRONG_LENGTH;
731 hfid = hf_snmp_null_value;
733 case BER_CLASS_APP: /* | (SNMP_IPA<<4)*/
735 case 4: hfid = hf_snmp_ipv4_value; break;
736 case 16: hfid = hf_snmp_ipv6_value; break;
737 default: hfid = hf_snmp_anyaddress_value; break;
740 case BER_CLASS_APP|(SNMP_U32<<4):
741 hfid = hf_snmp_unsigned32_value;
743 case BER_CLASS_APP|(SNMP_GGE<<4):
744 hfid = hf_snmp_gauge32_value;
746 case BER_CLASS_APP|(SNMP_CNT<<4):
747 hfid = hf_snmp_counter_value;
749 case BER_CLASS_APP|(SNMP_TIT<<4):
750 hfid = hf_snmp_timeticks_value;
752 case BER_CLASS_APP|(SNMP_OPQ<<4):
753 hfid = hf_snmp_opaque_value;
755 case BER_CLASS_APP|(SNMP_NSP<<4):
756 hfid = hf_snmp_nsap_value;
758 case BER_CLASS_APP|(SNMP_C64<<4):
759 hfid = hf_snmp_big_counter_value;
762 hfid = hf_snmp_unknown_value;
766 pi_value = proto_tree_add_item(pt_varbind,hfid,tvb,value_offset,value_len,FALSE);
767 expert_add_info_format(actx->pinfo, pi_value, PI_UNDECODED, PI_NOTE, "Unresolved value, Missing MIB");
768 oid_info_is_ok = FALSE;
771 pt_value = proto_item_add_subtree(pi_value,ett_value);
773 if (value_len > 0 && oid_string) {
774 tvbuff_t* sub_tvb = tvb_new_subset(tvb, value_offset, value_len, value_len);
776 next_tvb_add_string(&var_list, sub_tvb, (snmp_var_in_tree) ? pt_value : NULL, value_sub_dissectors_table, oid_string);
781 if (pi_value) proto_item_fill_label(pi_value->finfo, label);
783 if (oid_info && oid_info->name) {
785 repr = ep_strdup_printf("%s.%s (%s)",
787 oid_subid2string(&(subids[oid_matched]),oid_left),
788 oid_subid2string(subids,oid_matched+oid_left));
789 info_oid = ep_strdup_printf("%s.%s", oid_info->name,
790 oid_subid2string(&(subids[oid_matched]),oid_left));
792 repr = ep_strdup_printf("%s (%s)",
794 oid_subid2string(subids,oid_matched));
795 info_oid = oid_info->name;
797 } else if (oid_string) {
798 repr = ep_strdup(oid_string);
799 info_oid = oid_string;
801 repr = ep_strdup("[Bad OID]");
804 valstr = strstr(label,": ");
805 valstr = valstr ? valstr+2 : label;
807 proto_item_set_text(pi_varbind,"%s: %s",repr,valstr);
809 if (display_oid && info_oid && check_col(actx->pinfo->cinfo, COL_INFO)) {
810 col_append_fstr (actx->pinfo->cinfo, COL_INFO, " %s", info_oid);
813 switch (format_error) {
814 case BER_WRONG_LENGTH: {
815 proto_tree* pt = proto_item_add_subtree(pi_value,ett_decoding_error);
816 proto_item* pi = proto_tree_add_text(pt,tvb,0,0,"Wrong value length: %u expecting: %u <= len <= %u",
819 max_len == -1 ? 0xFFFFFF : max_len);
820 pt = proto_item_add_subtree(pi,ett_decoding_error);
821 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "Wrong length for SNMP VarBind/value");
822 return dissect_unknown_ber(actx->pinfo, tvb, value_start, pt);
824 case BER_WRONG_TAG: {
825 proto_tree* pt = proto_item_add_subtree(pi_value,ett_decoding_error);
826 proto_item* pi = proto_tree_add_text(pt,tvb,0,0,"Wrong class/tag for Value expected: %d,%d got: %d,%d",
827 oid_info->value_type->ber_class,
828 oid_info->value_type->ber_tag,
831 pt = proto_item_add_subtree(pi,ett_decoding_error);
832 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "Wrong class/tag for SNMP VarBind/value");
833 return dissect_unknown_ber(actx->pinfo, tvb, value_start, pt);
839 return seq_offset + seq_len;
843 #define F_SNMP_ENGINEID_CONFORM 0x80
844 #define SNMP_ENGINEID_RFC1910 0x00
845 #define SNMP_ENGINEID_RFC3411 0x01
847 static const true_false_string tfs_snmp_engineid_conform = {
849 "RFC1910 (Non-SNMPv3)"
852 #define SNMP_ENGINEID_FORMAT_IPV4 0x01
853 #define SNMP_ENGINEID_FORMAT_IPV6 0x02
854 #define SNMP_ENGINEID_FORMAT_MACADDRESS 0x03
855 #define SNMP_ENGINEID_FORMAT_TEXT 0x04
856 #define SNMP_ENGINEID_FORMAT_OCTETS 0x05
858 static const value_string snmp_engineid_format_vals[] = {
859 { SNMP_ENGINEID_FORMAT_IPV4, "IPv4 address" },
860 { SNMP_ENGINEID_FORMAT_IPV6, "IPv6 address" },
861 { SNMP_ENGINEID_FORMAT_MACADDRESS, "MAC address" },
862 { SNMP_ENGINEID_FORMAT_TEXT, "Text, administratively assigned" },
863 { SNMP_ENGINEID_FORMAT_OCTETS, "Octets, administratively assigned" },
868 * SNMP Engine ID dissection according to RFC 3411 (SnmpEngineID TC)
869 * or historic RFC 1910 (AgentID)
871 int dissect_snmp_engineid(proto_tree *tree, tvbuff_t *tvb, int offset, int len) {
872 proto_item *item = NULL;
873 guint8 conformance, format;
874 guint32 enterpriseid, seconds;
876 int len_remain = len;
878 /* first bit: engine id conformance */
879 if (len_remain<4) return offset;
880 conformance = ((tvb_get_guint8(tvb, offset)>>7) && 0x01);
881 proto_tree_add_item(tree, hf_snmp_engineid_conform, tvb, offset, 1, FALSE);
883 /* 4-byte enterprise number/name */
884 if (len_remain<4) return offset;
885 enterpriseid = tvb_get_ntohl(tvb, offset);
887 enterpriseid -= 0x80000000; /* ignore first bit */
888 proto_tree_add_uint(tree, hf_snmp_engineid_enterprise, tvb, offset, 4, enterpriseid);
892 switch(conformance) {
894 case SNMP_ENGINEID_RFC1910:
895 /* 12-byte AgentID w/ 8-byte trailer */
897 proto_tree_add_text(tree, tvb, offset, 8, "AgentID Trailer: 0x%s",
898 tvb_bytes_to_str(tvb, offset, 8));
902 proto_tree_add_text(tree, tvb, offset, len_remain, "<Data not conforming to RFC1910>");
907 case SNMP_ENGINEID_RFC3411: /* variable length: 5..32 */
909 /* 1-byte format specifier */
910 if (len_remain<1) return offset;
911 format = tvb_get_guint8(tvb, offset);
912 item = proto_tree_add_uint_format(tree, hf_snmp_engineid_format, tvb, offset, 1, format, "Engine ID Format: %s (%d)",
913 val_to_str(format, snmp_engineid_format_vals, "Reserved/Enterprise-specific"), format);
918 case SNMP_ENGINEID_FORMAT_IPV4:
919 /* 4-byte IPv4 address */
921 proto_tree_add_item(tree, hf_snmp_engineid_ipv4, tvb, offset, 4, FALSE);
926 case SNMP_ENGINEID_FORMAT_IPV6:
927 /* 16-byte IPv6 address */
928 if (len_remain==16) {
929 proto_tree_add_item(tree, hf_snmp_engineid_ipv6, tvb, offset, 16, FALSE);
934 case SNMP_ENGINEID_FORMAT_MACADDRESS:
935 /* 6-byte MAC address */
937 proto_tree_add_item(tree, hf_snmp_engineid_mac, tvb, offset, 6, FALSE);
942 case SNMP_ENGINEID_FORMAT_TEXT:
943 /* max. 27-byte string, administratively assigned */
944 if (len_remain<=27) {
945 proto_tree_add_item(tree, hf_snmp_engineid_text, tvb, offset, len_remain, FALSE);
951 /* most common enterprise-specific format: (ucd|net)-snmp random */
952 if ((enterpriseid==2021)||(enterpriseid==8072)) {
953 proto_item_append_text(item, (enterpriseid==2021) ? ": UCD-SNMP Random" : ": Net-SNMP Random");
954 /* demystify: 4B random, 4B epoch seconds */
956 proto_tree_add_item(tree, hf_snmp_engineid_data, tvb, offset, 4, FALSE);
957 seconds = tvb_get_letohl(tvb, offset+4);
959 proto_tree_add_time_format(tree, hf_snmp_engineid_time, tvb, offset+4, 4,
960 &ts, "Engine ID Data: Creation Time: %s",
961 abs_time_secs_to_str(seconds));
967 case SNMP_ENGINEID_FORMAT_OCTETS:
969 /* max. 27 bytes, administratively assigned or unknown format */
970 if (len_remain<=27) {
971 proto_tree_add_item(tree, hf_snmp_engineid_data, tvb, offset, len_remain, FALSE);
980 proto_tree_add_text(tree, tvb, offset, len_remain, "<Data not conforming to RFC3411>");
987 static void set_ue_keys(snmp_ue_assoc_t* n ) {
988 guint key_size = n->user.authModel->key_size;
990 n->user.authKey.data = se_alloc(key_size);
991 n->user.authKey.len = key_size;
992 n->user.authModel->pass2key(n->user.authPassword.data,
993 n->user.authPassword.len,
996 n->user.authKey.data);
998 n->user.privKey.data = se_alloc(key_size);
999 n->user.privKey.len = key_size;
1000 n->user.authModel->pass2key(n->user.privPassword.data,
1001 n->user.privPassword.len,
1004 n->user.privKey.data);
1007 static snmp_ue_assoc_t* ue_se_dup(snmp_ue_assoc_t* o) {
1008 snmp_ue_assoc_t* d = se_memdup(o,sizeof(snmp_ue_assoc_t));
1010 d->user.authModel = o->user.authModel;
1012 d->user.privProtocol = o->user.privProtocol;
1014 d->user.userName.data = se_memdup(o->user.userName.data,o->user.userName.len);
1015 d->user.userName.len = o->user.userName.len;
1017 d->user.authPassword.data = o->user.authPassword.data ? se_memdup(o->user.authPassword.data,o->user.authPassword.len) : NULL;
1018 d->user.authPassword.len = o->user.authPassword.len;
1020 d->user.privPassword.data = o->user.privPassword.data ? se_memdup(o->user.privPassword.data,o->user.privPassword.len) : NULL;
1021 d->user.privPassword.len = o->user.privPassword.len;
1023 d->engine.len = o->engine.len;
1025 if (d->engine.len) {
1026 d->engine.data = se_memdup(o->engine.data,o->engine.len);
1035 #define CACHE_INSERT(c,a) if (c) { snmp_ue_assoc_t* t = c; c = a; c->next = t; } else { c = a; a->next = NULL; }
1037 static void renew_ue_cache(void) {
1041 localized_ues = NULL;
1042 unlocalized_ues = NULL;
1044 for(i = 0; i < num_ueas; i++) {
1045 snmp_ue_assoc_t* a = ue_se_dup(&(ueas[i]));
1047 if (a->engine.len) {
1048 CACHE_INSERT(localized_ues,a);
1051 CACHE_INSERT(unlocalized_ues,a);
1056 localized_ues = NULL;
1057 unlocalized_ues = NULL;
1062 static snmp_ue_assoc_t* localize_ue( snmp_ue_assoc_t* o, const guint8* engine, guint engine_len ) {
1063 snmp_ue_assoc_t* n = se_memdup(o,sizeof(snmp_ue_assoc_t));
1065 n->engine.data = se_memdup(engine,engine_len);
1066 n->engine.len = engine_len;
1074 #define localized_match(a,u,ul,e,el) \
1075 ( a->user.userName.len == ul \
1076 && a->engine.len == el \
1077 && memcmp( a->user.userName.data, u, (a->user.userName.len < ul) ? a->user.userName.len : ul ) == 0 \
1078 && memcmp( a->engine.data, e, (a->engine.len < el) ? a->engine.len : el ) == 0 )
1080 #define unlocalized_match(a,u,l) \
1081 ( a->user.userName.len == l && memcmp( a->user.userName.data, u, a->user.userName.len < l ? a->user.userName.len : l) == 0 )
1083 static snmp_ue_assoc_t* get_user_assoc(tvbuff_t* engine_tvb, tvbuff_t* user_tvb) {
1084 static snmp_ue_assoc_t* a;
1085 guint given_username_len;
1086 guint8* given_username;
1087 guint given_engine_len;
1088 guint8* given_engine;
1090 if ( ! (localized_ues || unlocalized_ues ) ) return NULL;
1092 if (! ( user_tvb && engine_tvb ) ) return NULL;
1094 given_username_len = tvb_length_remaining(user_tvb,0);
1095 given_username = ep_tvb_memdup(user_tvb,0,-1);
1096 given_engine_len = tvb_length_remaining(engine_tvb,0);
1097 given_engine = ep_tvb_memdup(engine_tvb,0,-1);
1099 for (a = localized_ues; a; a = a->next) {
1100 if ( localized_match(a, given_username, given_username_len, given_engine, given_engine_len) ) {
1105 for (a = unlocalized_ues; a; a = a->next) {
1106 if ( unlocalized_match(a, given_username, given_username_len) ) {
1107 snmp_ue_assoc_t* n = localize_ue( a, given_engine, given_engine_len );
1108 CACHE_INSERT(localized_ues,n);
1116 static gboolean snmp_usm_auth_md5(snmp_usm_params_t* p, guint8** calc_auth_p, guint* calc_auth_len_p, gchar const** error) {
1123 guint8 calc_auth[16];
1129 *error = "No Authenticator";
1133 key = p->user_assoc->user.authKey.data;
1134 key_len = p->user_assoc->user.authKey.len;
1137 *error = "User has no authKey";
1142 auth_len = tvb_length_remaining(p->auth_tvb,0);
1144 if (auth_len != 12) {
1145 *error = "Authenticator length wrong";
1149 msg_len = tvb_length_remaining(p->msg_tvb,0);
1150 msg = ep_tvb_memdup(p->msg_tvb,0,msg_len);
1153 auth = ep_tvb_memdup(p->auth_tvb,0,auth_len);
1155 start = p->auth_offset - p->start_offset;
1156 end = start + auth_len;
1158 /* fill the authenticator with zeros */
1159 for ( i = start ; i < end ; i++ ) {
1163 md5_hmac(msg, msg_len, key, key_len, calc_auth);
1165 if (calc_auth_p) *calc_auth_p = calc_auth;
1166 if (calc_auth_len_p) *calc_auth_len_p = 12;
1168 return ( memcmp(auth,calc_auth,12) != 0 ) ? FALSE : TRUE;
1172 static gboolean snmp_usm_auth_sha1(snmp_usm_params_t* p _U_, guint8** calc_auth_p, guint* calc_auth_len_p, gchar const** error _U_) {
1179 guint8 calc_auth[20];
1185 *error = "No Authenticator";
1189 key = p->user_assoc->user.authKey.data;
1190 key_len = p->user_assoc->user.authKey.len;
1193 *error = "User has no authKey";
1198 auth_len = tvb_length_remaining(p->auth_tvb,0);
1201 if (auth_len != 12) {
1202 *error = "Authenticator length wrong";
1206 msg_len = tvb_length_remaining(p->msg_tvb,0);
1207 msg = ep_tvb_memdup(p->msg_tvb,0,msg_len);
1209 auth = ep_tvb_memdup(p->auth_tvb,0,auth_len);
1211 start = p->auth_offset - p->start_offset;
1212 end = start + auth_len;
1214 /* fill the authenticator with zeros */
1215 for ( i = start ; i < end ; i++ ) {
1219 sha1_hmac(key, key_len, msg, msg_len, calc_auth);
1221 if (calc_auth_p) *calc_auth_p = calc_auth;
1222 if (calc_auth_len_p) *calc_auth_len_p = 12;
1224 return ( memcmp(auth,calc_auth,12) != 0 ) ? FALSE : TRUE;
1227 static tvbuff_t* snmp_usm_priv_des(snmp_usm_params_t* p _U_, tvbuff_t* encryptedData _U_, gchar const** error _U_) {
1228 #ifdef HAVE_LIBGCRYPT
1230 gcry_cipher_hd_t hd = NULL;
1233 guint8* des_key = p->user_assoc->user.privKey.data; /* first 8 bytes */
1234 guint8* pre_iv = &(p->user_assoc->user.privKey.data[8]); /* last 8 bytes */
1239 tvbuff_t* clear_tvb;
1244 salt_len = tvb_length_remaining(p->priv_tvb,0);
1246 if (salt_len != 8) {
1247 *error = "decryptionError: msgPrivacyParameters length != 8";
1251 salt = ep_tvb_memdup(p->priv_tvb,0,salt_len);
1254 The resulting "salt" is XOR-ed with the pre-IV to obtain the IV.
1256 for (i=0; i<8; i++) {
1257 iv[i] = pre_iv[i] ^ salt[i];
1260 cryptgrm_len = tvb_length_remaining(encryptedData,0);
1262 if (cryptgrm_len % 8) {
1263 *error = "decryptionError: the length of the encrypted data is not a mutiple of 8 octets";
1267 cryptgrm = ep_tvb_memdup(encryptedData,0,-1);
1269 cleartext = ep_alloc(cryptgrm_len);
1271 err = gcry_cipher_open(&hd, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_CBC, 0);
1272 if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1274 err = gcry_cipher_setiv(hd, iv, 8);
1275 if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1277 err = gcry_cipher_setkey(hd,des_key,8);
1278 if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1280 err = gcry_cipher_decrypt(hd, cleartext, cryptgrm_len, cryptgrm, cryptgrm_len);
1281 if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1283 gcry_cipher_close(hd);
1285 clear_tvb = tvb_new_real_data(cleartext, cryptgrm_len, cryptgrm_len);
1290 *error = (void*)gpg_strerror(err);
1291 if (hd) gcry_cipher_close(hd);
1294 *error = "libgcrypt not present, cannot decrypt";
1299 static tvbuff_t* snmp_usm_priv_aes(snmp_usm_params_t* p _U_, tvbuff_t* encryptedData _U_, gchar const** error _U_) {
1300 #ifdef HAVE_LIBGCRYPT
1302 gcry_cipher_hd_t hd = NULL;
1305 guint8* aes_key = p->user_assoc->user.privKey.data; /* first 16 bytes */
1310 tvbuff_t* clear_tvb;
1312 priv_len = tvb_length_remaining(p->priv_tvb,0);
1314 if (priv_len != 8) {
1315 *error = "decryptionError: msgPrivacyParameters length != 8";
1319 iv[0] = (p->boots & 0xff000000) >> 24;
1320 iv[1] = (p->boots & 0x00ff0000) >> 16;
1321 iv[2] = (p->boots & 0x0000ff00) >> 8;
1322 iv[3] = (p->boots & 0x000000ff);
1323 iv[4] = (p->time & 0xff000000) >> 24;
1324 iv[5] = (p->time & 0x00ff0000) >> 16;
1325 iv[6] = (p->time & 0x0000ff00) >> 8;
1326 iv[7] = (p->time & 0x000000ff);
1327 tvb_memcpy(p->priv_tvb,&(iv[8]),0,8);
1329 cryptgrm_len = tvb_length_remaining(encryptedData,0);
1330 cryptgrm = ep_tvb_memdup(encryptedData,0,-1);
1332 cleartext = ep_alloc(cryptgrm_len);
1334 err = gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CFB, 0);
1335 if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1337 err = gcry_cipher_setiv(hd, iv, 16);
1338 if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1340 err = gcry_cipher_setkey(hd,aes_key,16);
1341 if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1343 err = gcry_cipher_decrypt(hd, cleartext, cryptgrm_len, cryptgrm, cryptgrm_len);
1344 if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1346 gcry_cipher_close(hd);
1348 clear_tvb = tvb_new_real_data(cleartext, cryptgrm_len, cryptgrm_len);
1353 *error = (void*)gpg_strerror(err);
1354 if (hd) gcry_cipher_close(hd);
1357 *error = "libgcrypt not present, cannot decrypt";
1363 gboolean check_ScopedPdu(tvbuff_t* tvb) {
1368 int hoffset, eoffset;
1371 offset = get_ber_identifier(tvb, 0, &class, &pc, &tag);
1372 offset = get_ber_length(tvb, offset, NULL, NULL);
1374 if ( ! (((class!=BER_CLASS_APP) && (class!=BER_CLASS_PRI) )
1375 && ( (!pc) || (class!=BER_CLASS_UNI) || (tag!=BER_UNI_TAG_ENUMERATED) )
1378 if((tvb_get_guint8(tvb, offset)==0)&&(tvb_get_guint8(tvb, offset+1)==0))
1383 offset = get_ber_identifier(tvb, offset, &class, &pc, &tag);
1384 offset = get_ber_length(tvb, offset, &len, NULL);
1385 eoffset = offset + len;
1387 if (eoffset <= hoffset) return FALSE;
1389 if ((class!=BER_CLASS_APP)&&(class!=BER_CLASS_PRI))
1390 if( (class!=BER_CLASS_UNI)
1391 ||((tag<BER_UNI_TAG_NumericString)&&(tag!=BER_UNI_TAG_OCTETSTRING)&&(tag!=BER_UNI_TAG_UTF8String)) )
1398 #include "packet-snmp-fn.c"
1402 dissect_snmp_pdu(tvbuff_t *tvb, int offset, packet_info *pinfo,
1403 proto_tree *tree, int proto, gint ett, gboolean is_tcp)
1406 guint length_remaining;
1408 gboolean pc, ind = 0;
1411 guint message_length;
1412 int start_offset = offset;
1413 guint32 version = 0;
1415 proto_tree *snmp_tree = NULL;
1416 proto_item *item = NULL;
1417 asn1_ctx_t asn1_ctx;
1418 asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
1421 usm_p.msg_tvb = tvb;
1422 usm_p.start_offset = offset_from_real_beginning(tvb,0) ;
1423 usm_p.engine_tvb = NULL;
1424 usm_p.user_tvb = NULL;
1425 usm_p.auth_item = NULL;
1426 usm_p.auth_tvb = NULL;
1427 usm_p.auth_offset = 0;
1428 usm_p.priv_tvb = NULL;
1429 usm_p.user_assoc = NULL;
1430 usm_p.authenticated = FALSE;
1431 usm_p.encrypted = FALSE;
1434 usm_p.authOK = FALSE;
1437 * This will throw an exception if we don't have any data left.
1438 * That's what we want. (See "tcp_dissect_pdus()", which is
1439 * similar, but doesn't have to deal with ASN.1.
1440 * XXX - can we make "tcp_dissect_pdus()" provide enough
1441 * information to the "get_pdu_len" routine so that we could
1442 * have that routine deal with ASN.1, and just use
1443 * "tcp_dissect_pdus()"?)
1445 length_remaining = tvb_ensure_length_remaining(tvb, offset);
1447 /* NOTE: we have to parse the message piece by piece, since the
1448 * capture length may be less than the message length: a 'global'
1449 * parsing is likely to fail.
1453 * If this is SNMP-over-TCP, we might have to do reassembly
1454 * in order to read the "Sequence Of" header.
1456 if (is_tcp && snmp_desegment && pinfo->can_desegment) {
1458 * This is TCP, and we should, and can, do reassembly.
1460 * Is the "Sequence Of" header split across segment
1461 * boundaries? We requre at least 6 bytes for the
1462 * header, which allows for a 4-byte length (ASN.1
1465 if (length_remaining < 6) {
1466 pinfo->desegment_offset = offset;
1467 pinfo->desegment_len = 6 - length_remaining;
1470 * Return 0, which means "I didn't dissect anything
1471 * because I don't have enough data - we need
1479 * OK, try to read the "Sequence Of" header; this gets the total
1480 * length of the SNMP message.
1482 /* Set tree to 0 to not display internakl BER fields if option used.*/
1483 offset = dissect_ber_identifier(pinfo, 0, tvb, offset, &class, &pc, &tag);
1484 offset = dissect_ber_length(pinfo, 0, tvb, offset, &len, &ind);
1486 message_length = len + 2;
1487 offset = dissect_ber_integer(FALSE, &asn1_ctx, 0, tvb, offset, -1, &version);
1491 * If this is SNMP-over-TCP, we might have to do reassembly
1492 * to get all of this message.
1494 if (is_tcp && snmp_desegment && pinfo->can_desegment) {
1496 * Yes - is the message split across segment boundaries?
1498 if (length_remaining < message_length) {
1500 * Yes. Tell the TCP dissector where the data
1501 * for this message starts in the data it handed
1502 * us, and how many more bytes we need, and
1505 pinfo->desegment_offset = start_offset;
1506 pinfo->desegment_len =
1507 message_length - length_remaining;
1510 * Return 0, which means "I didn't dissect anything
1511 * because I don't have enough data - we need
1518 next_tvb_init(&var_list);
1520 if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
1521 col_set_str(pinfo->cinfo, COL_PROTOCOL,
1522 proto_get_protocol_short_name(find_protocol_by_id(proto)));
1526 item = proto_tree_add_item(tree, proto, tvb, offset,
1527 message_length, FALSE);
1528 snmp_tree = proto_item_add_subtree(item, ett);
1534 offset = dissect_snmp_Message(FALSE , tvb, start_offset, &asn1_ctx, snmp_tree, -1);
1537 offset = dissect_snmp_Messagev2u(FALSE , tvb, start_offset, &asn1_ctx, snmp_tree, -1);
1541 offset = dissect_snmp_SNMPv3Message(FALSE , tvb, start_offset, &asn1_ctx, snmp_tree, -1);
1545 * Return the length remaining in the tvbuff, so
1546 * if this is SNMP-over-TCP, our caller thinks there's
1547 * nothing left to dissect.
1549 proto_tree_add_text(snmp_tree, tvb, offset, -1,"Unknown version");
1550 return length_remaining;
1554 next_tvb_call(&var_list, pinfo, tree, NULL, data_handle);
1560 dissect_snmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1562 conversation_t *conversation;
1571 * See if this looks like SNMP or not. if not, return 0 so
1572 * wireshark can try som other dissector instead.
1574 /* All SNMP packets are BER encoded and consist of a SEQUENCE
1575 * that spans the entire PDU. The first item is an INTEGER that
1576 * has the values 0-2 (version 1-3).
1577 * if not it is not snmp.
1579 /* SNMP starts with a SEQUENCE */
1580 offset = get_ber_identifier(tvb, 0, &tmp_class, &tmp_pc, &tmp_tag);
1581 if((tmp_class!=BER_CLASS_UNI)||(tmp_tag!=BER_UNI_TAG_SEQUENCE)){
1584 /* then comes a length which spans the rest of the tvb */
1585 offset = get_ber_length(tvb, offset, &tmp_length, &tmp_ind);
1586 if(tmp_length!=(guint32)tvb_reported_length_remaining(tvb, offset)){
1589 /* then comes an INTEGER (version)*/
1590 offset = get_ber_identifier(tvb, offset, &tmp_class, &tmp_pc, &tmp_tag);
1591 if((tmp_class!=BER_CLASS_UNI)||(tmp_tag!=BER_UNI_TAG_INTEGER)){
1594 /* do we need to test that version is 0 - 2 (version1-3) ? */
1598 * The first SNMP packet goes to the SNMP port; the second one
1599 * may come from some *other* port, but goes back to the same
1600 * IP address and port as the ones from which the first packet
1601 * came; all subsequent packets presumably go between those two
1602 * IP addresses and ports.
1604 * If this packet went to the SNMP port, we check to see if
1605 * there's already a conversation with one address/port pair
1606 * matching the source IP address and port of this packet,
1607 * the other address matching the destination IP address of this
1608 * packet, and any destination port.
1610 * If not, we create one, with its address 1/port 1 pair being
1611 * the source address/port of this packet, its address 2 being
1612 * the destination address of this packet, and its port 2 being
1613 * wildcarded, and give it the SNMP dissector as a dissector.
1615 if (pinfo->destport == UDP_PORT_SNMP) {
1616 conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst, PT_UDP,
1617 pinfo->srcport, 0, NO_PORT_B);
1618 if( (conversation == NULL) || (conversation->dissector_handle!=snmp_handle) ){
1619 conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst, PT_UDP,
1620 pinfo->srcport, 0, NO_PORT2);
1621 conversation_set_dissector(conversation, snmp_handle);
1625 return dissect_snmp_pdu(tvb, 0, pinfo, tree, proto_snmp, ett_snmp, FALSE);
1628 dissect_snmp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1633 while (tvb_reported_length_remaining(tvb, offset) > 0) {
1634 message_len = dissect_snmp_pdu(tvb, 0, pinfo, tree,
1635 proto_snmp, ett_snmp, TRUE);
1636 if (message_len == 0) {
1638 * We don't have all the data for that message,
1639 * so we need to do desegmentation;
1640 * "dissect_snmp_pdu()" has set that up.
1644 offset += message_len;
1649 dissect_smux(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1651 proto_tree *smux_tree = NULL;
1652 proto_item *item = NULL;
1654 next_tvb_init(&var_list);
1656 if (check_col(pinfo->cinfo, COL_PROTOCOL))
1657 col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMUX");
1660 item = proto_tree_add_item(tree, proto_smux, tvb, 0, -1, FALSE);
1661 smux_tree = proto_item_add_subtree(item, ett_smux);
1664 dissect_SMUX_PDUs_PDU(tvb, pinfo, tree);
1669 MD5 Password to Key Algorithm
1672 static void snmp_usm_password_to_key_md5(const guint8 *password,
1674 const guint8 *engineID,
1678 guint8 *cp, password_buf[64];
1679 guint32 password_index = 0;
1680 guint32 count = 0, i;
1682 md5_init(&MD); /* initialize MD5 */
1684 /**********************************************/
1685 /* Use while loop until we've done 1 Megabyte */
1686 /**********************************************/
1687 while (count < 1048576) {
1689 for (i = 0; i < 64; i++) {
1690 /*************************************************/
1691 /* Take the next octet of the password, wrapping */
1692 /* to the beginning of the password as necessary.*/
1693 /*************************************************/
1694 *cp++ = password[password_index++ % passwordlen];
1696 md5_append(&MD, password_buf, 64);
1699 md5_finish(&MD, key1); /* tell MD5 we're done */
1701 /*****************************************************/
1702 /* Now localize the key with the engineID and pass */
1703 /* through MD5 to produce final key */
1704 /* May want to ensure that engineLength <= 32, */
1705 /* otherwise need to use a buffer larger than 64 */
1706 /*****************************************************/
1709 md5_append(&MD, key1, 16);
1710 md5_append(&MD, engineID, engineLength);
1711 md5_append(&MD, key1, 16);
1712 md5_finish(&MD, key);
1721 SHA1 Password to Key Algorithm COPIED from RFC 3414 A.2.2
1724 static void snmp_usm_password_to_key_sha1(const guint8 *password,
1726 const guint8 *engineID,
1730 guint8 *cp, password_buf[72];
1731 guint32 password_index = 0;
1732 guint32 count = 0, i;
1734 sha1_starts(&SH); /* initialize SHA */
1736 /**********************************************/
1737 /* Use while loop until we've done 1 Megabyte */
1738 /**********************************************/
1739 while (count < 1048576) {
1741 for (i = 0; i < 64; i++) {
1742 /*************************************************/
1743 /* Take the next octet of the password, wrapping */
1744 /* to the beginning of the password as necessary.*/
1745 /*************************************************/
1746 *cp++ = password[password_index++ % passwordlen];
1748 sha1_update (&SH, password_buf, 64);
1751 sha1_finish(&SH, key);
1753 /*****************************************************/
1754 /* Now localize the key with the engineID and pass */
1755 /* through SHA to produce final key */
1756 /* May want to ensure that engineLength <= 32, */
1757 /* otherwise need to use a buffer larger than 72 */
1758 /*****************************************************/
1759 memcpy(password_buf, key, 20);
1760 memcpy(password_buf+20, engineID, engineLength);
1761 memcpy(password_buf+20+engineLength, key, 20);
1764 sha1_update(&SH, password_buf, 40+engineLength);
1765 sha1_finish(&SH, key);
1770 static void process_prefs(void) {}
1772 static void* snmp_users_copy_cb(void* dest, const void* orig, unsigned len _U_) {
1773 const snmp_ue_assoc_t* o = orig;
1774 snmp_ue_assoc_t* d = dest;
1776 d->auth_model = o->auth_model;
1777 d->user.authModel = auth_models[o->auth_model];
1779 d->priv_proto = o->priv_proto;
1780 d->user.privProtocol = priv_protos[o->priv_proto];
1782 d->user.userName.data = g_memdup(o->user.userName.data,o->user.userName.len);
1783 d->user.userName.len = o->user.userName.len;
1785 d->user.authPassword.data = o->user.authPassword.data ? g_memdup(o->user.authPassword.data,o->user.authPassword.len) : NULL;
1786 d->user.authPassword.len = o->user.authPassword.len;
1788 d->user.privPassword.data = o->user.privPassword.data ? g_memdup(o->user.privPassword.data,o->user.privPassword.len) : NULL;
1789 d->user.privPassword.len = o->user.privPassword.len;
1791 d->engine.len = o->engine.len;
1792 if (o->engine.data) {
1793 d->engine.data = g_memdup(o->engine.data,o->engine.len);
1796 d->user.authKey.data = o->user.authKey.data ? g_memdup(o->user.authKey.data,o->user.authKey.len) : NULL;
1797 d->user.authKey.len = o->user.authKey.len;
1799 d->user.privKey.data = o->user.privKey.data ? g_memdup(o->user.privKey.data,o->user.privKey.len) : NULL;
1800 d->user.privKey.len = o->user.privKey.len;
1805 static void snmp_users_free_cb(void* p) {
1806 snmp_ue_assoc_t* ue = p;
1807 if (ue->user.userName.data) g_free(ue->user.userName.data);
1808 if (ue->user.authPassword.data) g_free(ue->user.authPassword.data);
1809 if (ue->user.privPassword.data) g_free(ue->user.privPassword.data);
1810 if (ue->user.authKey.data) g_free(ue->user.authKey.data);
1811 if (ue->user.privKey.data) g_free(ue->user.privKey.data);
1812 if (ue->engine.data) g_free(ue->engine.data);
1815 static void snmp_users_update_cb(void* p _U_, const char** err) {
1816 snmp_ue_assoc_t* ue = p;
1817 GString* es = g_string_new("");
1821 if (! ue->user.userName.len) g_string_append(es,"no userName, ");
1824 g_string_truncate(es,es->len-2);
1825 *err = ep_strdup(es->str);
1828 g_string_free(es,TRUE);
1833 UAT_LSTRING_CB_DEF(snmp_users,userName,snmp_ue_assoc_t,user.userName.data,user.userName.len)
1834 UAT_LSTRING_CB_DEF(snmp_users,authPassword,snmp_ue_assoc_t,user.authPassword.data,user.authPassword.len)
1835 UAT_LSTRING_CB_DEF(snmp_users,privPassword,snmp_ue_assoc_t,user.privPassword.data,user.privPassword.len)
1836 UAT_BUFFER_CB_DEF(snmp_users,engine_id,snmp_ue_assoc_t,engine.data,engine.len)
1837 UAT_VS_DEF(snmp_users,auth_model,snmp_ue_assoc_t,0,"MD5")
1838 UAT_VS_DEF(snmp_users,priv_proto,snmp_ue_assoc_t,0,"DES")
1840 /*--- proto_register_snmp -------------------------------------------*/
1841 void proto_register_snmp(void) {
1842 /* List of fields */
1843 static hf_register_info hf[] = {
1844 { &hf_snmp_v3_flags_auth,
1845 { "Authenticated", "snmp.v3.flags.auth", FT_BOOLEAN, 8,
1846 TFS(&flags_set_truth), TH_AUTH, "", HFILL }},
1847 { &hf_snmp_v3_flags_crypt,
1848 { "Encrypted", "snmp.v3.flags.crypt", FT_BOOLEAN, 8,
1849 TFS(&flags_set_truth), TH_CRYPT, "", HFILL }},
1850 { &hf_snmp_v3_flags_report,
1851 { "Reportable", "snmp.v3.flags.report", FT_BOOLEAN, 8,
1852 TFS(&flags_set_truth), TH_REPORT, "", HFILL }},
1853 { &hf_snmp_engineid_conform, {
1854 "Engine ID Conformance", "snmp.engineid.conform", FT_BOOLEAN, 8,
1855 TFS(&tfs_snmp_engineid_conform), F_SNMP_ENGINEID_CONFORM, "Engine ID RFC3411 Conformance", HFILL }},
1856 { &hf_snmp_engineid_enterprise, {
1857 "Engine Enterprise ID", "snmp.engineid.enterprise", FT_UINT32, BASE_DEC,
1858 VALS(sminmpec_values), 0, "Engine Enterprise ID", HFILL }},
1859 { &hf_snmp_engineid_format, {
1860 "Engine ID Format", "snmp.engineid.format", FT_UINT8, BASE_DEC,
1861 VALS(snmp_engineid_format_vals), 0, "Engine ID Format", HFILL }},
1862 { &hf_snmp_engineid_ipv4, {
1863 "Engine ID Data: IPv4 address", "snmp.engineid.ipv4", FT_IPv4, BASE_NONE,
1864 NULL, 0, "Engine ID Data: IPv4 address", HFILL }},
1865 { &hf_snmp_engineid_ipv6, {
1866 "Engine ID Data: IPv6 address", "snmp.engineid.ipv6", FT_IPv6, BASE_NONE,
1867 NULL, 0, "Engine ID Data: IPv6 address", HFILL }},
1868 { &hf_snmp_engineid_mac, {
1869 "Engine ID Data: MAC address", "snmp.engineid.mac", FT_ETHER, BASE_NONE,
1870 NULL, 0, "Engine ID Data: MAC address", HFILL }},
1871 { &hf_snmp_engineid_text, {
1872 "Engine ID Data: Text", "snmp.engineid.text", FT_STRING, BASE_NONE,
1873 NULL, 0, "Engine ID Data: Text", HFILL }},
1874 { &hf_snmp_engineid_time, {
1875 "Engine ID Data: Time", "snmp.engineid.time", FT_ABSOLUTE_TIME, BASE_NONE,
1876 NULL, 0, "Engine ID Data: Time", HFILL }},
1877 { &hf_snmp_engineid_data, {
1878 "Engine ID Data", "snmp.engineid.data", FT_BYTES, BASE_HEX,
1879 NULL, 0, "Engine ID Data", HFILL }},
1880 { &hf_snmp_msgAuthentication,
1881 { "Authentication", "snmp.v3.auth", FT_BOOLEAN, 8,
1882 TFS(&auth_flags), 0, "", HFILL }},
1883 { &hf_snmp_decryptedPDU, {
1884 "Decrypted ScopedPDU", "snmp.decrypted_pdu", FT_BYTES, BASE_HEX,
1885 NULL, 0, "Decrypted PDU", HFILL }},
1886 { &hf_snmp_noSuchObject, { "noSuchObject", "snmp.noSuchObject", FT_NONE, BASE_NONE, NULL, 0, "", HFILL }},
1887 { &hf_snmp_noSuchInstance, { "noSuchInstance", "snmp.noSuchInstance", FT_NONE, BASE_DEC, NULL, 0, "", HFILL }},
1888 { &hf_snmp_endOfMibView, { "endOfMibView", "snmp.endOfMibView", FT_NONE, BASE_DEC, NULL, 0, "", HFILL }},
1889 { &hf_snmp_unSpecified, { "unSpecified", "snmp.unSpecified", FT_NONE, BASE_DEC, NULL, 0, "", HFILL }},
1891 { &hf_snmp_integer32_value, { "Value (Integer32)", "snmp.value.int", FT_INT64, BASE_DEC, NULL, 0, "", HFILL }},
1892 { &hf_snmp_octetstring_value, { "Value (OctetString)", "snmp.value.octets", FT_BYTES, BASE_NONE, NULL, 0, "", HFILL }},
1893 { &hf_snmp_oid_value, { "Value (OID)", "snmp.value.oid", FT_OID, BASE_NONE, NULL, 0, "", HFILL }},
1894 { &hf_snmp_null_value, { "Value (Null)", "snmp.value.null", FT_NONE, BASE_NONE, NULL, 0, "", HFILL }},
1895 { &hf_snmp_ipv4_value, { "Value (IpAddress)", "snmp.value.ipv4", FT_IPv4, BASE_NONE, NULL, 0, "", HFILL }},
1896 { &hf_snmp_ipv6_value, { "Value (IpAddress)", "snmp.value.ipv6", FT_IPv6, BASE_NONE, NULL, 0, "", HFILL }},
1897 { &hf_snmp_anyaddress_value, { "Value (IpAddress)", "snmp.value.addr", FT_BYTES, BASE_DEC, NULL, 0, "", HFILL }},
1898 { &hf_snmp_unsigned32_value, { "Value (Unsigned32)", "snmp.value.u32", FT_INT64, BASE_DEC, NULL, 0, "", HFILL }},
1899 { &hf_snmp_gauge32_value, { "Value (Gauge32)", "snmp.value.g32", FT_INT64, BASE_DEC, NULL, 0, "", HFILL }},
1900 { &hf_snmp_unknown_value, { "Value (Unknown)", "snmp.value.unk", FT_BYTES, BASE_NONE, NULL, 0, "", HFILL }},
1901 { &hf_snmp_counter_value, { "Value (Counter32)", "snmp.value.counter", FT_UINT64, BASE_DEC, NULL, 0, "", HFILL }},
1902 { &hf_snmp_big_counter_value, { "Value (Counter64)", "snmp.value.counter", FT_UINT64, BASE_DEC, NULL, 0, "", HFILL }},
1903 { &hf_snmp_nsap_value, { "Value (NSAP)", "snmp.value.nsap", FT_UINT64, BASE_DEC, NULL, 0, "", HFILL }},
1904 { &hf_snmp_timeticks_value, { "Value (Timeticks)", "snmp.value.timeticks", FT_UINT64, BASE_DEC, NULL, 0, "", HFILL }},
1905 { &hf_snmp_opaque_value, { "Value (Opaque)", "snmp.value.opaque", FT_BYTES, BASE_NONE, NULL, 0, "", HFILL }},
1906 { &hf_snmp_objectname, { "Object Name", "snmp.name", FT_OID, BASE_NONE, NULL, 0, "", HFILL }},
1907 { &hf_snmp_scalar_instance_index, { "Scalar Instance Index", "snmp.name.index", FT_UINT64, BASE_DEC, NULL, 0, "", HFILL }},
1910 #include "packet-snmp-hfarr.c"
1913 /* List of subtrees */
1914 static gint *ett[] = {
1920 &ett_authParameters,
1925 &ett_decoding_error,
1926 #include "packet-snmp-ettarr.c"
1928 module_t *snmp_module;
1929 static uat_field_t users_fields[] = {
1930 UAT_FLD_BUFFER(snmp_users,engine_id,"Engine-id for this entry (empty = any)"),
1931 UAT_FLD_LSTRING(snmp_users,userName,"The username"),
1932 UAT_FLD_VS(snmp_users,auth_model,auth_types,"Algorithm to be used for authentication."),
1933 UAT_FLD_LSTRING(snmp_users,authPassword,"The password used for authenticating packets for this entry"),
1934 UAT_FLD_VS(snmp_users,priv_proto,priv_types,"Algorithm to be used for privacy."),
1935 UAT_FLD_LSTRING(snmp_users,privPassword,"The password used for encrypting packets for this entry"),
1939 assocs_uat = uat_new("SNMP Users",
1940 sizeof(snmp_ue_assoc_t),
1946 "ChSNMPUsersSection",
1948 snmp_users_update_cb,
1952 /* Register protocol */
1953 proto_snmp = proto_register_protocol(PNAME, PSNAME, PFNAME);
1954 new_register_dissector("snmp", dissect_snmp, proto_snmp);
1956 /* Register fields and subtrees */
1957 proto_register_field_array(proto_snmp, hf, array_length(hf));
1958 proto_register_subtree_array(ett, array_length(ett));
1961 /* Register configuration preferences */
1962 snmp_module = prefs_register_protocol(proto_snmp, process_prefs);
1963 prefs_register_bool_preference(snmp_module, "display_oid",
1964 "Show SNMP OID in info column",
1965 "Whether the SNMP OID should be shown in the info column",
1968 prefs_register_obsolete_preference(snmp_module, "mib_modules");
1969 prefs_register_obsolete_preference(snmp_module, "users_file");
1971 prefs_register_bool_preference(snmp_module, "desegment",
1972 "Reassemble SNMP-over-TCP messages\nspanning multiple TCP segments",
1973 "Whether the SNMP dissector should reassemble messages spanning multiple TCP segments."
1974 " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
1977 prefs_register_bool_preference(snmp_module, "var_in_tree",
1978 "Display dissected variables inside SNMP tree",
1979 "ON - display dissected variables inside SNMP tree, OFF - display dissected variables in root tree after SNMP",
1982 prefs_register_uat_preference(snmp_module, "users_table",
1984 "Table of engine-user associations used for authentication and decryption",
1988 prefs_register_static_text_preference(snmp_module, "info_mibs",
1989 "MIB settings can be changed in the Name Resolution preferences",
1990 "MIB settings can be changed in the Name Resolution preferences");
1992 value_sub_dissectors_table = register_dissector_table("snmp.variable_oid","SNMP Variable OID", FT_STRING, BASE_NONE);
1994 register_init_routine(renew_ue_cache);
1998 /*--- proto_reg_handoff_snmp ---------------------------------------*/
1999 void proto_reg_handoff_snmp(void) {
2000 dissector_handle_t snmp_tcp_handle;
2002 snmp_handle = find_dissector("snmp");
2004 dissector_add("udp.port", UDP_PORT_SNMP, snmp_handle);
2005 dissector_add("udp.port", UDP_PORT_SNMP_TRAP, snmp_handle);
2006 dissector_add("udp.port", UDP_PORT_SNMP_PATROL, snmp_handle);
2007 dissector_add("ethertype", ETHERTYPE_SNMP, snmp_handle);
2008 dissector_add("ipx.socket", IPX_SOCKET_SNMP_AGENT, snmp_handle);
2009 dissector_add("ipx.socket", IPX_SOCKET_SNMP_SINK, snmp_handle);
2010 dissector_add("hpext.dxsap", HPEXT_SNMP, snmp_handle);
2012 snmp_tcp_handle = create_dissector_handle(dissect_snmp_tcp, proto_snmp);
2013 dissector_add("tcp.port", TCP_PORT_SNMP, snmp_tcp_handle);
2014 dissector_add("tcp.port", TCP_PORT_SNMP_TRAP, snmp_tcp_handle);
2016 data_handle = find_dissector("data");
2019 * Process preference settings.
2021 * We can't do this in the register routine, as preferences aren't
2022 * read until all dissector register routines have been called (so
2023 * that all dissector preferences have been registered).
2030 proto_register_smux(void)
2032 static hf_register_info hf[] = {
2034 { "Version", "smux.version", FT_UINT8, BASE_DEC, NULL,
2037 { "PDU type", "smux.pdutype", FT_UINT8, BASE_DEC, VALS(smux_types),
2040 static gint *ett[] = {
2044 proto_smux = proto_register_protocol("SNMP Multiplex Protocol",
2046 proto_register_field_array(proto_smux, hf, array_length(hf));
2047 proto_register_subtree_array(ett, array_length(ett));
2052 proto_reg_handoff_smux(void)
2054 dissector_handle_t smux_handle;
2056 smux_handle = create_dissector_handle(dissect_smux, proto_smux);
2057 dissector_add("tcp.port", TCP_PORT_SMUX, smux_handle);