asn1/snmp/packet-snmp-template.c

   1 /* packet-snmp.c
   2  * Routines for SNMP (simple network management protocol)
   3  * Copyright (C) 1998 Didier Jorand
   4  *
   5  * See RFC 1157 for SNMPv1.
   6  *
   7  * See RFCs 1901, 1905, and 1906 for SNMPv2c.
   8  *
   9  * See RFCs 1905, 1906, 1909, and 1910 for SNMPv2u [historic].
  10  *
  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
  14  *
  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.org>
  19  *
  20  * $Id$
  21  *
  22  * Wireshark - Network traffic analyzer
  23  * By Gerald Combs <gerald@wireshark.org>
  24  * Copyright 1998 Gerald Combs
  25  *
  26  * Some stuff from:
  27  *
  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
  31  *
  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.
  36  *
  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.
  41  *
  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.
  45  */
  46
  47 #define D(args) do {printf args; fflush(stdout); } while(0)
  48
  49 #ifdef HAVE_CONFIG_H
  50 # include "config.h"
  51 #endif
  52
  53 #include <string.h>
  54 #include <ctype.h>
  55
  56 #include <glib.h>
  57
  58 #include <epan/packet.h>
  59 #include <epan/strutil.h>
  60 #include <epan/conversation.h>
  61 #include <epan/etypes.h>
  62 #include <epan/prefs.h>
  63 #include <epan/sminmpec.h>
  64 #include <epan/emem.h>
  65 #include <epan/next_tvb.h>
  66 #include <epan/uat.h>
  67 #include <epan/asn1.h>
  68 #include "packet-ipx.h"
  69 #include "packet-hpext.h"
  70
  71
  72 #include "packet-ber.h"
  73
  74 #include "packet-snmp.h"
  75
  76 #include <epan/crypt/sha1.h>
  77 #include <epan/crypt/md5.h>
  78 #include <epan/expert.h>
  79 #include <epan/report_err.h>
  80 #include <epan/oids.h>
  81
  82
  83 #ifdef HAVE_LIBGCRYPT
  84 #include <gcrypt.h>
  85 #endif
  86
  87 /* Take a pointer that may be null and return a pointer that's not null
  88    by turning null pointers into pointers to the above null string,
  89    and, if the argument pointer wasn't null, make sure we handle
  90    non-printable characters in the string by escaping them. */
  91 #define SAFE_STRING(s, l)       (((s) != NULL) ? format_text((s), (l)) : "")
  92
  93 #define PNAME  "Simple Network Management Protocol"
  94 #define PSNAME "SNMP"
  95 #define PFNAME "snmp"
  96
  97 #define UDP_PORT_SNMP           161
  98 #define UDP_PORT_SNMP_TRAP      162
  99 #define TCP_PORT_SNMP           161
 100 #define TCP_PORT_SNMP_TRAP      162
 101 #define TCP_PORT_SMUX           199
 102 #define UDP_PORT_SNMP_PATROL 8161
 103
 104 /* Initialize the protocol and registered fields */
 105 static int proto_snmp = -1;
 106 static int proto_smux = -1;
 107
 108 static gboolean display_oid = TRUE;
 109 static gboolean snmp_var_in_tree = TRUE;
 110
 111 static gboolean snmp_usm_auth_md5(snmp_usm_params_t* p, guint8**, guint*, gchar const**);
 112 static gboolean snmp_usm_auth_sha1(snmp_usm_params_t* p, guint8**, guint*, gchar const**);
 113
 114 static tvbuff_t* snmp_usm_priv_des(snmp_usm_params_t*, tvbuff_t*, gchar const**);
 115 static tvbuff_t* snmp_usm_priv_aes(snmp_usm_params_t*, tvbuff_t*, gchar const**);
 116
 117
 118 static void snmp_usm_password_to_key_md5(const guint8 *password, guint passwordlen, const guint8 *engineID, guint engineLength, guint8 *key);
 119 static void snmp_usm_password_to_key_sha1(const guint8 *password, guint passwordlen, const guint8 *engineID, guint engineLength, guint8 *key);
 120
 121
 122 static snmp_usm_auth_model_t model_md5 = {snmp_usm_password_to_key_md5, snmp_usm_auth_md5, 16};
 123 static snmp_usm_auth_model_t model_sha1 = {snmp_usm_password_to_key_sha1, snmp_usm_auth_sha1, 20};
 124
 125 static const value_string auth_types[] = {
 126         {0,"MD5"},
 127         {1,"SHA1"},
 128         {0,NULL}
 129 };
 130 static snmp_usm_auth_model_t* auth_models[] = {&model_md5,&model_sha1};
 131
 132
 133 static const value_string priv_types[] = {
 134         {0,"DES"},
 135         {1,"AES"},
 136         {0,NULL}
 137 };
 138 static snmp_usm_decoder_t priv_protos[] = {snmp_usm_priv_des, snmp_usm_priv_aes};
 139
 140 static snmp_ue_assoc_t* ueas = NULL;
 141 static guint num_ueas = 0;
 142 static snmp_ue_assoc_t* localized_ues = NULL;
 143 static snmp_ue_assoc_t* unlocalized_ues = NULL;
 144 /****/
 145
 146 /* Variabled used for handling enterprise spesific trap types */
 147 typedef struct _snmp_st_assoc_t {
 148         char *enterprise;
 149         guint trap;
 150         char *desc;
 151 } snmp_st_assoc_t;
 152 static guint num_specific_traps = 0;
 153 static snmp_st_assoc_t *specific_traps = NULL;
 154 static const char *enterprise_oid = NULL;
 155 static guint generic_trap = 0;
 156
 157
 158 static snmp_usm_params_t usm_p = {FALSE,FALSE,0,0,0,0,NULL,NULL,NULL,NULL,NULL,NULL,NULL,FALSE};
 159
 160 #define TH_AUTH   0x01
 161 #define TH_CRYPT  0x02
 162 #define TH_REPORT 0x04
 163
 164 /* desegmentation of SNMP-over-TCP */
 165 static gboolean snmp_desegment = TRUE;
 166
 167 /* Global variables */
 168
 169 guint32 MsgSecurityModel;
 170 tvbuff_t *oid_tvb=NULL;
 171 tvbuff_t *value_tvb=NULL;
 172
 173 static dissector_handle_t snmp_handle;
 174 static dissector_handle_t data_handle;
 175
 176 static next_tvb_list_t var_list;
 177
 178 static int hf_snmp_v3_flags_auth = -1;
 179 static int hf_snmp_v3_flags_crypt = -1;
 180 static int hf_snmp_v3_flags_report = -1;
 181
 182 static int hf_snmp_engineid_conform = -1;
 183 static int hf_snmp_engineid_enterprise = -1;
 184 static int hf_snmp_engineid_format = -1;
 185 static int hf_snmp_engineid_ipv4 = -1;
 186 static int hf_snmp_engineid_ipv6 = -1;
 187 static int hf_snmp_engineid_cisco_type = -1;
 188 static int hf_snmp_engineid_mac = -1;
 189 static int hf_snmp_engineid_text = -1;
 190 static int hf_snmp_engineid_time = -1;
 191 static int hf_snmp_engineid_data = -1;
 192 static int hf_snmp_decryptedPDU = -1;
 193 static int hf_snmp_msgAuthentication = -1;
 194
 195 static int hf_snmp_noSuchObject = -1;
 196 static int hf_snmp_noSuchInstance = -1;
 197 static int hf_snmp_endOfMibView = -1;
 198 static int hf_snmp_unSpecified = -1;
 199
 200 static int hf_snmp_integer32_value = -1;
 201 static int hf_snmp_octetstring_value = -1;
 202 static int hf_snmp_oid_value = -1;
 203 static int hf_snmp_null_value = -1;
 204 static int hf_snmp_ipv4_value = -1;
 205 static int hf_snmp_ipv6_value = -1;
 206 static int hf_snmp_anyaddress_value = -1;
 207 static int hf_snmp_unsigned32_value = -1;
 208 static int hf_snmp_unknown_value = -1;
 209 static int hf_snmp_opaque_value = -1;
 210 static int hf_snmp_nsap_value = -1;
 211 static int hf_snmp_counter_value = -1;
 212 static int hf_snmp_timeticks_value = -1;
 213 static int hf_snmp_big_counter_value = -1;
 214 static int hf_snmp_gauge32_value = -1;
 215
 216 static int hf_snmp_objectname = -1;
 217 static int hf_snmp_scalar_instance_index = -1;
 218
 219
 220 #include "packet-snmp-hf.c"
 221
 222 static int hf_smux_version = -1;
 223 static int hf_smux_pdutype = -1;
 224
 225 /* Initialize the subtree pointers */
 226 static gint ett_smux = -1;
 227 static gint ett_snmp = -1;
 228 static gint ett_engineid = -1;
 229 static gint ett_msgFlags = -1;
 230 static gint ett_encryptedPDU = -1;
 231 static gint ett_decrypted = -1;
 232 static gint ett_authParameters = -1;
 233 static gint ett_internet = -1;
 234 static gint ett_varbind = -1;
 235 static gint ett_name = -1;
 236 static gint ett_value = -1;
 237 static gint ett_decoding_error = -1;
 238
 239 #include "packet-snmp-ett.c"
 240
 241 static const true_false_string auth_flags = {
 242         "OK",
 243         "Failed"
 244 };
 245
 246 /* Security Models */
 247
 248 #define SNMP_SEC_ANY                    0
 249 #define SNMP_SEC_V1                             1
 250 #define SNMP_SEC_V2C                    2
 251 #define SNMP_SEC_USM                    3
 252
 253 static const value_string sec_models[] = {
 254         { SNMP_SEC_ANY,                 "Any" },
 255         { SNMP_SEC_V1,                  "V1" },
 256         { SNMP_SEC_V2C,                 "V2C" },
 257         { SNMP_SEC_USM,                 "USM" },
 258         { 0,                            NULL }
 259 };
 260
 261 /* SMUX PDU types */
 262 #define SMUX_MSG_OPEN           0
 263 #define SMUX_MSG_CLOSE          1
 264 #define SMUX_MSG_RREQ           2
 265 #define SMUX_MSG_RRSP           3
 266 #define SMUX_MSG_SOUT           4
 267
 268 static const value_string smux_types[] = {
 269         { SMUX_MSG_OPEN,        "Open" },
 270         { SMUX_MSG_CLOSE,       "Close" },
 271         { SMUX_MSG_RREQ,        "Registration Request" },
 272         { SMUX_MSG_RRSP,        "Registration Response" },
 273         { SMUX_MSG_SOUT,        "Commit Or Rollback" },
 274         { 0,                    NULL }
 275 };
 276
 277
 278 #define SNMP_IPA    0           /* IP Address */
 279 #define SNMP_CNT    1           /* Counter (Counter32) */
 280 #define SNMP_GGE    2           /* Gauge (Gauge32) */
 281 #define SNMP_TIT    3           /* TimeTicks */
 282 #define SNMP_OPQ    4           /* Opaque */
 283 #define SNMP_NSP    5           /* NsapAddress */
 284 #define SNMP_C64    6           /* Counter64 */
 285 #define SNMP_U32    7           /* Uinteger32 */
 286
 287 #define SERR_NSO    0
 288 #define SERR_NSI    1
 289 #define SERR_EOM    2
 290
 291
 292 dissector_table_t value_sub_dissectors_table;
 293
 294
 295 static const gchar *
 296 snmp_lookup_specific_trap (guint specific_trap)
 297 {
 298         guint i;
 299
 300         for (i = 0; i < num_specific_traps; i++) {
 301                 snmp_st_assoc_t *u = &(specific_traps[i]);
 302
 303                 if ((u->trap == specific_trap) &&
 304                     (strcmp (u->enterprise, enterprise_oid) == 0))
 305                 {
 306                         return u->desc;
 307                 }
 308         }
 309
 310         return NULL;
 311 }
 312
 313 /*
 314  *  dissect_snmp_VarBind
 315  *  this routine dissects variable bindings, looking for the oid information in our oid reporsitory
 316  *  to format and add the value adequatelly.
 317  *
 318  * The choice to handwrite this code instead of using the asn compiler is to avoid having tons
 319  * of uses of global variables distributed in very different parts of the code.
 320  * Other than that there's a cosmetic thing: the tree from ASN generated code would be so
 321  * convoluted due to the nesting of CHOICEs in the definition of VarBind/value.
 322  *
 323  * XXX: the length of this function (~400 lines) is an aberration!
 324  *  oid_key_t:key_type could become a series of callbacks instead of an enum
 325  *  the (! oid_info_is_ok) switch could be made into an array (would be slower)
 326  *
 327
 328         NetworkAddress ::=  CHOICE { internet IpAddress }
 329         IpAddress ::= [APPLICATION 0] IMPLICIT OCTET STRING (SIZE (4))
 330         TimeTicks ::= [APPLICATION 3] IMPLICIT INTEGER (0..4294967295)
 331         Integer32 ::= INTEGER (-2147483648..2147483647)
 332         ObjectName ::= OBJECT IDENTIFIER
 333         Counter32 ::= [APPLICATION 1] IMPLICIT INTEGER (0..4294967295)
 334         Gauge32 ::= [APPLICATION 2] IMPLICIT INTEGER (0..4294967295)
 335         Unsigned32 ::= [APPLICATION 2] IMPLICIT INTEGER (0..4294967295)
 336         Integer-value ::=  INTEGER (-2147483648..2147483647)
 337         Integer32 ::= INTEGER (-2147483648..2147483647)
 338         ObjectID-value ::= OBJECT IDENTIFIER
 339         Empty ::= NULL
 340         TimeTicks ::= [APPLICATION 3] IMPLICIT INTEGER (0..4294967295)
 341         Opaque ::= [APPLICATION 4] IMPLICIT OCTET STRING
 342         Counter64 ::= [APPLICATION 6] IMPLICIT INTEGER (0..18446744073709551615)
 343
 344         ObjectSyntax ::= CHOICE {
 345                  simple SimpleSyntax,
 346                  application-wide ApplicationSyntax
 347         }
 348
 349         SimpleSyntax ::= CHOICE {
 350            integer-value Integer-value,
 351            string-value String-value,
 352            objectID-value ObjectID-value,
 353            empty  Empty
 354         }
 355
 356         ApplicationSyntax ::= CHOICE {
 357            ipAddress-value IpAddress,
 358            counter-value Counter32,
 359            timeticks-value TimeTicks,
 360            arbitrary-value Opaque,
 361            big-counter-value Counter64,
 362            unsigned-integer-value Unsigned32
 363         }
 364
 365         ValueType ::=  CHOICE {
 366            value ObjectSyntax,
 367            unSpecified NULL,
 368            noSuchObject[0] IMPLICIT NULL,
 369            noSuchInstance[1] IMPLICIT NULL,
 370            endOfMibView[2] IMPLICIT NULL
 371         }
 372
 373         VarBind ::= SEQUENCE {
 374            name ObjectName,
 375            valueType ValueType
 376         }
 377
 378  */
 379
 380 extern int
 381 dissect_snmp_VarBind(gboolean implicit_tag _U_, tvbuff_t *tvb, int offset,
 382                      asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_)
 383 {
 384         int seq_offset, name_offset, value_offset, value_start;
 385         guint32 seq_len, name_len, value_len;
 386         gint8 ber_class;
 387         gboolean pc;
 388         gint32 tag;
 389         gboolean ind;
 390         guint32* subids;
 391         guint8* oid_bytes;
 392         oid_info_t* oid_info = NULL;
 393         guint oid_matched, oid_left;
 394         proto_item *pi_name, *pi_varbind, *pi_value = NULL;
 395         proto_tree *pt, *pt_varbind, *pt_name, *pt_value;
 396         char label[ITEM_LABEL_LENGTH];
 397         const char* repr = NULL;
 398         const char* info_oid = NULL;
 399         char* valstr;
 400         int hfid = -1;
 401         int min_len = 0, max_len = 0;
 402         gboolean oid_info_is_ok;
 403         const char* oid_string = NULL;
 404         enum {BER_NO_ERROR, BER_WRONG_LENGTH, BER_WRONG_TAG} format_error = BER_NO_ERROR;
 405
 406         seq_offset = offset;
 407
 408         /* first have the VarBind's sequence header */
 409         offset = get_ber_identifier(tvb, offset, &ber_class, &pc, &tag);
 410         offset = get_ber_length(tvb, offset, &seq_len, &ind);
 411
 412         seq_len += offset - seq_offset;
 413
 414         if (!pc && ber_class==BER_CLASS_UNI && tag==BER_UNI_TAG_SEQUENCE) {
 415                 proto_item* pi = proto_tree_add_text(tree, tvb, seq_offset, seq_len,"VarBind must be an universal class sequence");
 416                 pt = proto_item_add_subtree(pi,ett_decoding_error);
 417                 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "VarBind is not an universal class sequence");
 418                 return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
 419         }
 420
 421         if (ind) {
 422                 proto_item* pi = proto_tree_add_text(tree, tvb, seq_offset, seq_len,"Indicator must be clear in VarBind");
 423                 pt = proto_item_add_subtree(pi,ett_decoding_error);
 424                 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "VarBind has indicator set");
 425                 return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
 426         }
 427
 428         /* then we have the ObjectName's header */
 429
 430         offset = get_ber_identifier(tvb, offset, &ber_class, &pc, &tag);
 431         name_offset = offset = get_ber_length(tvb, offset, &name_len, &ind);
 432
 433         if (! ( !pc && ber_class==BER_CLASS_UNI && tag==BER_UNI_TAG_OID) ) {
 434                 proto_item* pi = proto_tree_add_text(tree, tvb, seq_offset, seq_len,"ObjectName must be an OID in primitive encoding");
 435                 pt = proto_item_add_subtree(pi,ett_decoding_error);
 436                 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "ObjectName not an OID");
 437                 return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
 438         }
 439
 440         if (ind) {
 441                 proto_item* pi = proto_tree_add_text(tree, tvb, seq_offset, seq_len,"Indicator must be clear in ObjectName");
 442                 pt = proto_item_add_subtree(pi,ett_decoding_error);
 443                 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "ObjectName has indicator set");
 444                 return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
 445         }
 446
 447         offset += name_len;
 448         value_start = offset;
 449
 450         /* then we have the  value's header */
 451         offset = get_ber_identifier(tvb, offset, &ber_class, &pc, &tag);
 452         value_offset = get_ber_length(tvb, offset, &value_len, &ind);
 453
 454         if (! (!pc) ) {
 455                 proto_item* pi = proto_tree_add_text(tree, tvb, seq_offset, seq_len,"the value must be in primitive encoding");
 456                 pt = proto_item_add_subtree(pi,ett_decoding_error);
 457                 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "value not in primitive encoding");
 458                 return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
 459         }
 460
 461         /* Now, we know where everithing is */
 462
 463
 464
 465         /* we add the varbind tree root with a dummy label we'll fill later on */
 466         pi_varbind = proto_tree_add_text(tree,tvb,seq_offset,seq_len,"VarBind");
 467         pt_varbind = proto_item_add_subtree(pi_varbind,ett_varbind);
 468         *label = '\0';
 469
 470         pi_name = proto_tree_add_item(pt_varbind,hf_snmp_objectname,tvb,name_offset,name_len,ENC_NA);
 471         pt_name = proto_item_add_subtree(pi_name,ett_name);
 472
 473         /* fetch ObjectName and its relative oid_info */
 474         oid_bytes = ep_tvb_memdup(tvb, name_offset, name_len);
 475         oid_info = oid_get_from_encoded(oid_bytes, name_len, &subids, &oid_matched, &oid_left);
 476
 477         add_oid_debug_subtree(oid_info,pt_name);
 478
 479         if (!subids) {
 480                 proto_item* pi;
 481
 482                 repr = oid_encoded2string(oid_bytes, name_len);
 483                 pi = proto_tree_add_text(pt_name,tvb, 0, 0, "invalid oid: %s", repr);
 484                 pt = proto_item_add_subtree(pi, ett_decoding_error);
 485                 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "invalid oid: %s", repr);
 486                 return dissect_unknown_ber(actx->pinfo, tvb, name_offset, pt);
 487         }
 488
 489         if (oid_matched+oid_left) {
 490                 oid_string = oid_subid2string(subids,oid_matched+oid_left);
 491         }
 492
 493         if (ber_class == BER_CLASS_CON) {
 494                 /* if we have an error value just add it and get out the way ASAP */
 495                 proto_item* pi;
 496                 const char* note;
 497
 498                 if (value_len != 0) {
 499                         min_len = max_len = 0;
 500                         format_error = BER_WRONG_LENGTH;
 501                 }
 502
 503                 switch (tag) {
 504                         case SERR_NSO:
 505                                 hfid = hf_snmp_noSuchObject;
 506                                 note = "noSuchObject";
 507                                 break;
 508                         case SERR_NSI:
 509                                 hfid = hf_snmp_noSuchInstance;
 510                                 note = "noSuchInstance";
 511                                 break;
 512                         case SERR_EOM:
 513                                 hfid = hf_snmp_endOfMibView;
 514                                 note = "endOfMibView";
 515                                 break;
 516                         default: {
 517                                 pi = proto_tree_add_text(pt_varbind,tvb,0,0,"Wrong tag for Error Value: expected 0, 1, or 2 but got: %d",tag);
 518                                 pt = proto_item_add_subtree(pi,ett_decoding_error);
 519                                 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "Wrong tag for SNMP VarBind error value");
 520                                 return dissect_unknown_ber(actx->pinfo, tvb, value_start, pt);
 521                         }
 522                 }
 523
 524                 pi = proto_tree_add_item(pt_varbind,hfid,tvb,value_offset,value_len,ENC_BIG_ENDIAN);
 525                 expert_add_info_format(actx->pinfo, pi, PI_RESPONSE_CODE, PI_NOTE, "%s",note);
 526                 g_strlcpy (label, note, ITEM_LABEL_LENGTH);
 527                 goto set_label;
 528         }
 529
 530         /* 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 */
 531         switch (oid_info->kind) {
 532                 case OID_KIND_SCALAR:
 533                         if (oid_left  == 1) {
 534                                 /* OK: we got the instance sub-id */
 535                                 proto_tree_add_uint64(pt_name,hf_snmp_scalar_instance_index,tvb,name_offset,name_len,subids[oid_matched]);
 536                                 oid_info_is_ok = TRUE;
 537                                 goto indexing_done;
 538                         } else if (oid_left  == 0) {
 539                                 if (ber_class == BER_CLASS_UNI && tag == BER_UNI_TAG_NULL) {
 540                                         /* unSpecified  does not require an instance sub-id add the new value and get off the way! */
 541                                         pi_value = proto_tree_add_item(pt_varbind,hf_snmp_unSpecified,tvb,value_offset,value_len,ENC_NA);
 542                                         goto set_label;
 543                                 } else {
 544                                         proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"A scalar should have one instance sub-id this one has none");
 545                                         expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "No instance sub-id in scalar value");
 546                                         oid_info_is_ok = FALSE;
 547                                         goto indexing_done;
 548                                 }
 549                         } else {
 550                                 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);
 551                                 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "Wrong number of instance sub-ids in scalar value");
 552                                 oid_info_is_ok = FALSE;
 553                                 goto indexing_done;
 554                         }
 555                 break;
 556                 case OID_KIND_COLUMN:
 557                         if ( oid_info->parent->kind == OID_KIND_ROW) {
 558                                 oid_key_t* k = oid_info->parent->key;
 559                                 guint key_start = oid_matched;
 560                                 guint key_len = oid_left;
 561                                 oid_info_is_ok = TRUE;
 562
 563                                 if ( key_len == 0 && ber_class == BER_CLASS_UNI && tag == BER_UNI_TAG_NULL) {
 564                                         /* unSpecified  does not require an instance sub-id add the new value and get off the way! */
 565                                         pi_value = proto_tree_add_item(pt_varbind,hf_snmp_unSpecified,tvb,value_offset,value_len,ENC_NA);
 566                                         goto set_label;
 567                                 }
 568
 569                                 if (k) {
 570                                         for (;k;k = k->next) {
 571                                                 guint suboid_len;
 572
 573                                                 if (key_start >= oid_matched+oid_left) {
 574                                                         proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"index sub-oid shorter than expected");
 575                                                         expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "index sub-oid shorter than expected");
 576                                                         oid_info_is_ok = FALSE;
 577                                                         goto indexing_done;
 578                                                 }
 579
 580                                                 switch(k->key_type) {
 581                                                         case OID_KEY_TYPE_WRONG: {
 582                                                                 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 developers");
 583                                                                 expert_add_info_format(actx->pinfo, pi, PI_UNDECODED, PI_WARN, "Unimplemented instance index");
 584                                                                 oid_info_is_ok = FALSE;
 585                                                                 goto indexing_done;
 586                                                         }
 587                                                         case OID_KEY_TYPE_INTEGER: {
 588                                                                 if (IS_FT_INT(k->ft_type)) {
 589                                                                         proto_tree_add_int(pt_name,k->hfid,tvb,name_offset,name_len,(guint)subids[key_start]);
 590                                                                 } else { /* if it's not an unsigned int let proto_tree_add_uint throw a warning */
 591                                                                         proto_tree_add_uint64(pt_name,k->hfid,tvb,name_offset,name_len,(guint)subids[key_start]);
 592                                                                 }
 593                                                                 key_start++;
 594                                                                 key_len--;
 595                                                                 continue; /* k->next */
 596                                                         }
 597                                                         case OID_KEY_TYPE_IMPLIED_OID:
 598                                                                 suboid_len = key_len;
 599
 600                                                                 goto show_oid_index;
 601
 602                                                         case OID_KEY_TYPE_OID: {
 603                                                                 guint8* suboid_buf;
 604                                                                 guint suboid_buf_len;
 605                                                                 guint32* suboid;
 606
 607                                                                 suboid_len = subids[key_start++];
 608                                                                 key_len--;
 609
 610 show_oid_index:
 611                                                                 suboid = &(subids[key_start]);
 612
 613                                                                 if( suboid_len == 0 ) {
 614                                                                         proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"an index sub-oid OID cannot be 0 bytes long!");
 615                                                                         expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "index sub-oid OID with len=0");
 616                                                                         oid_info_is_ok = FALSE;
 617                                                                         goto indexing_done;
 618                                                                 }
 619
 620                                                                 if( key_len < suboid_len ) {
 621                                                                         proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"index sub-oid should not be longer than remaining oid size");
 622                                                                         expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "index sub-oid longer than remaining oid size");
 623                                                                         oid_info_is_ok = FALSE;
 624                                                                         goto indexing_done;
 625                                                                 }
 626
 627                                                                 suboid_buf_len = oid_subid2encoded(suboid_len, suboid, &suboid_buf);
 628
 629                                                                 DISSECTOR_ASSERT(suboid_buf_len);
 630
 631                                                                 proto_tree_add_oid(pt_name,k->hfid,tvb,name_offset, suboid_buf_len, suboid_buf);
 632
 633                                                                 key_start += suboid_len;
 634                                                                 key_len -= suboid_len + 1;
 635                                                                 continue; /* k->next */
 636                                                         }
 637                                                         default: {
 638                                                                 guint8* buf;
 639                                                                 guint buf_len;
 640                                                                 guint32* suboid;
 641                                                                 guint i;
 642
 643
 644                                                                 switch (k->key_type) {
 645                                                                         case OID_KEY_TYPE_IPADDR:
 646                                                                                 suboid = &(subids[key_start]);
 647                                                                                 buf_len = 4;
 648                                                                                 break;
 649                                                                         case OID_KEY_TYPE_IMPLIED_STRING:
 650                                                                         case OID_KEY_TYPE_IMPLIED_BYTES:
 651                                                                         case OID_KEY_TYPE_ETHER:
 652                                                                                 suboid = &(subids[key_start]);
 653                                                                                 buf_len = key_len;
 654                                                                                 break;
 655                                                                         default:
 656                                                                                 buf_len = k->num_subids;
 657                                                                                 suboid = &(subids[key_start]);
 658
 659                                                                                 if(!buf_len) {
 660                                                                                         buf_len = *suboid++;
 661                                                                                         key_len--;
 662                                                                                         key_start++;
 663                                                                                 }
 664                                                                                 break;
 665                                                                 }
 666
 667                                                                 if( key_len < buf_len ) {
 668                                                                         proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"index string should not be longer than remaining oid size");
 669                                                                         expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "index string longer than remaining oid size");
 670                                                                         oid_info_is_ok = FALSE;
 671                                                                         goto indexing_done;
 672                                                                 }
 673
 674                                                                 buf = ep_alloc(buf_len+1);
 675                                                                 for (i = 0; i < buf_len; i++)
 676                                                                         buf[i] = (guint8)suboid[i];
 677                                                                 buf[i] = '\0';
 678
 679                                                                 switch(k->key_type) {
 680                                                                         case OID_KEY_TYPE_STRING:
 681                                                                         case OID_KEY_TYPE_IMPLIED_STRING:
 682                                                                                 proto_tree_add_string(pt_name,k->hfid,tvb,name_offset,buf_len, buf);
 683                                                                                 break;
 684                                                                         case OID_KEY_TYPE_BYTES:
 685                                                                         case OID_KEY_TYPE_NSAP:
 686                                                                         case OID_KEY_TYPE_IMPLIED_BYTES:
 687                                                                                 proto_tree_add_bytes(pt_name,k->hfid,tvb,name_offset,buf_len, buf);
 688                                                                                 break;
 689                                                                         case OID_KEY_TYPE_ETHER:
 690                                                                                 proto_tree_add_ether(pt_name,k->hfid,tvb,name_offset,buf_len, buf);
 691                                                                                 break;
 692                                                                         case OID_KEY_TYPE_IPADDR: {
 693                                                                                 guint32* ipv4_p = (void*)buf;
 694                                                                                 proto_tree_add_ipv4(pt_name,k->hfid,tvb,name_offset,buf_len, *ipv4_p);
 695                                                                                 }
 696                                                                                 break;
 697                                                                         default:
 698                                                                                 DISSECTOR_ASSERT_NOT_REACHED();
 699                                                                                 break;
 700                                                                 }
 701
 702                                                                 key_start += buf_len;
 703                                                                 key_len -= buf_len;
 704                                                                 continue; /* k->next*/
 705                                                         }
 706                                                 }
 707                                         }
 708                                         goto indexing_done;
 709                                 } else {
 710                                         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");
 711                                         expert_add_info_format(actx->pinfo, pi, PI_UNDECODED, PI_WARN, "Unimplemented instance index");
 712                                         oid_info_is_ok = FALSE;
 713                                         goto indexing_done;
 714                                 }
 715                         } else {
 716                                 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.");
 717                                 expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_ERROR, "COLUMS's parent is not a ROW");
 718                                 oid_info_is_ok = FALSE;
 719                                 goto indexing_done;
 720                         }
 721                 default: {
 722 /*                      proto_item* pi = proto_tree_add_text(pt_name,tvb,0,0,"This kind OID should have no value");
 723                         expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "This kind OID should have no value"); */
 724                         oid_info_is_ok = FALSE;
 725                         goto indexing_done;
 726                 }
 727         }
 728 indexing_done:
 729
 730         if (oid_info_is_ok && oid_info->value_type) {
 731                 if (ber_class == BER_CLASS_UNI && tag == BER_UNI_TAG_NULL) {
 732                         pi_value = proto_tree_add_item(pt_varbind,hf_snmp_unSpecified,tvb,value_offset,value_len,ENC_NA);
 733                 } else {
 734                         /* Provide a tree_item to attach errors to, if needed. */
 735                         pi_value = pi_name;
 736
 737                         if ((oid_info->value_type->ber_class != BER_CLASS_ANY) &&
 738                                 (ber_class != oid_info->value_type->ber_class))
 739                                 format_error = BER_WRONG_TAG;
 740                         else if ((oid_info->value_type->ber_tag != BER_TAG_ANY) &&
 741                                 (tag != oid_info->value_type->ber_tag))
 742                                 format_error = BER_WRONG_TAG;
 743                         else {
 744                                 max_len = oid_info->value_type->max_len == -1 ? 0xffffff : oid_info->value_type->max_len;
 745                                 min_len  = oid_info->value_type->min_len;
 746
 747                                 if ((int)value_len < min_len || (int)value_len > max_len)
 748                                         format_error = BER_WRONG_LENGTH;
 749                         }
 750
 751                         if (format_error == BER_NO_ERROR)
 752                                 pi_value = proto_tree_add_item(pt_varbind,oid_info->value_hfid,tvb,value_offset,value_len,ENC_BIG_ENDIAN);
 753                 }
 754         } else {
 755                 switch(ber_class|(tag<<4)) {
 756                         case BER_CLASS_UNI|(BER_UNI_TAG_INTEGER<<4):
 757                         {
 758                                 gint64 val=0;
 759                                 unsigned int_val_offset = value_offset;
 760                                 unsigned i;
 761
 762                                 max_len = 5; min_len = 1;
 763                                 if (value_len > (guint)max_len && value_len < (guint)min_len) {
 764                                         format_error = BER_WRONG_LENGTH;
 765                                         break;
 766                                 }
 767
 768                                 if(value_len > 0) {
 769                                         /* extend sign bit */
 770                                         if(tvb_get_guint8(tvb, int_val_offset)&0x80) {
 771                                                 val=-1;
 772                                         }
 773                                         for(i=0;i<value_len;i++) {
 774                                                 val=(val<<8)|tvb_get_guint8(tvb, int_val_offset);
 775                                                 int_val_offset++;
 776                                         }
 777                                 }
 778                                 proto_tree_add_int64(pt_varbind, hf_snmp_integer32_value, tvb,value_offset,value_len, val);
 779
 780                                 goto already_added;
 781                         }
 782                         case BER_CLASS_UNI|(BER_UNI_TAG_OCTETSTRING<<4):
 783                                 hfid = hf_snmp_octetstring_value;
 784                                 break;
 785                         case BER_CLASS_UNI|(BER_UNI_TAG_OID<<4):
 786                                 max_len = -1; min_len = 1;
 787                                 if (value_len < (guint)min_len) format_error = BER_WRONG_LENGTH;
 788                                 hfid = hf_snmp_oid_value;
 789                                 break;
 790                         case BER_CLASS_UNI|(BER_UNI_TAG_NULL<<4):
 791                                 max_len = 0; min_len = 0;
 792                                 if (value_len != 0) format_error = BER_WRONG_LENGTH;
 793                                 hfid = hf_snmp_null_value;
 794                                 break;
 795                         case BER_CLASS_APP: /* | (SNMP_IPA<<4)*/
 796                                 switch(value_len) {
 797                                         case 4: hfid = hf_snmp_ipv4_value; break;
 798                                         case 16: hfid = hf_snmp_ipv6_value; break;
 799                                         default: hfid = hf_snmp_anyaddress_value; break;
 800                                 }
 801                                 break;
 802                         case BER_CLASS_APP|(SNMP_U32<<4):
 803                                 hfid = hf_snmp_unsigned32_value;
 804                                 break;
 805                         case BER_CLASS_APP|(SNMP_GGE<<4):
 806                                 hfid = hf_snmp_gauge32_value;
 807                                 break;
 808                         case BER_CLASS_APP|(SNMP_CNT<<4):
 809                                 hfid = hf_snmp_counter_value;
 810                                 break;
 811                         case BER_CLASS_APP|(SNMP_TIT<<4):
 812                                 hfid = hf_snmp_timeticks_value;
 813                                 break;
 814                         case BER_CLASS_APP|(SNMP_OPQ<<4):
 815                                 hfid = hf_snmp_opaque_value;
 816                                 break;
 817                         case BER_CLASS_APP|(SNMP_NSP<<4):
 818                                 hfid = hf_snmp_nsap_value;
 819                                 break;
 820                         case BER_CLASS_APP|(SNMP_C64<<4):
 821                                 hfid = hf_snmp_big_counter_value;
 822                                 break;
 823                         default:
 824                                 hfid = hf_snmp_unknown_value;
 825                                 break;
 826                 }
 827                 if (value_len > 8) {
 828                         /*
 829                          * Too long for an FT_UINT64 or an FT_INT64.
 830                          */
 831                         header_field_info *hfinfo = proto_registrar_get_nth(hfid);
 832                         if (hfinfo->type == FT_UINT64) {
 833                                 /*
 834                                  * Check if this is an unsigned int64 with
 835                                  * a big value.
 836                                  */
 837                                 if (value_len > 9 || tvb_get_guint8(tvb, value_offset) != 0) {
 838                                         /* It is.  Fail. */
 839                                         pi_value = proto_tree_add_text(pt_varbind,tvb,value_offset,value_len,"Integral value too large");
 840                                         expert_add_info_format(actx->pinfo, pi_value, PI_UNDECODED, PI_NOTE, "Unsigned integer value > 2^64 - 1");
 841                                         goto already_added;
 842                                 }
 843                                 /* Cheat and skip the leading 0 byte */
 844                                 value_len--;
 845                                 value_offset++;
 846                         } else if (hfinfo->type == FT_INT64) {
 847                                 /*
 848                                  * For now, just reject these.
 849                                  */
 850                                 pi_value = proto_tree_add_text(pt_varbind,tvb,value_offset,value_len,"Integral value too large or too small");
 851                                 expert_add_info_format(actx->pinfo, pi_value, PI_UNDECODED, PI_NOTE, "Signed integer value > 2^63 - 1 or <= -2^63");
 852                                 goto already_added;
 853                         }
 854                 } else if (value_len == 0) {
 855                         /*
 856                          * X.690 section 8.3.1 "Encoding of an integer value":
 857                          * "The encoding of an integer value shall be
 858                          * primitive. The contents octets shall consist of
 859                          * one or more octets."
 860                          *
 861                          * Zero is not "one or more".
 862                          */
 863                         header_field_info *hfinfo = proto_registrar_get_nth(hfid);
 864                         if (hfinfo->type == FT_UINT64 || hfinfo->type == FT_INT64) {
 865                                 pi_value = proto_tree_add_text(pt_varbind,tvb,value_offset,value_len,"Integral value is zero-length");
 866                                 expert_add_info_format(actx->pinfo, pi_value, PI_UNDECODED, PI_NOTE, "Integral value is zero-length");
 867                                 goto already_added;
 868                         }
 869                 }
 870                 pi_value = proto_tree_add_item(pt_varbind,hfid,tvb,value_offset,value_len,ENC_BIG_ENDIAN);
 871                 if (format_error != BER_NO_ERROR) {
 872                         expert_add_info_format(actx->pinfo, pi_value, PI_UNDECODED, PI_NOTE, "Unresolved value, Missing MIB");
 873                 }
 874
 875 already_added:
 876                 oid_info_is_ok = FALSE;
 877         }
 878
 879         pt_value = proto_item_add_subtree(pi_value,ett_value);
 880
 881         if (value_len > 0 && oid_string) {
 882                 tvbuff_t* sub_tvb = tvb_new_subset(tvb, value_offset, value_len, value_len);
 883
 884                 next_tvb_add_string(&var_list, sub_tvb, (snmp_var_in_tree) ? pt_value : NULL, value_sub_dissectors_table, oid_string);
 885         }
 886
 887
 888 set_label:
 889         if (pi_value) proto_item_fill_label(PITEM_FINFO(pi_value), label);
 890
 891         if (oid_info && oid_info->name) {
 892                 if (oid_left >= 1) {
 893                         repr  = ep_strdup_printf("%s.%s (%s)", oid_info->name,
 894                                                  oid_subid2string(&(subids[oid_matched]),oid_left),
 895                                                  oid_subid2string(subids,oid_matched+oid_left));
 896                         info_oid = ep_strdup_printf("%s.%s", oid_info->name,
 897                                                     oid_subid2string(&(subids[oid_matched]),oid_left));
 898                 } else {
 899                         repr  = ep_strdup_printf("%s (%s)", oid_info->name,
 900                                                  oid_subid2string(subids,oid_matched));
 901                         info_oid = oid_info->name;
 902                 }
 903         } else if (oid_string) {
 904                 repr  = ep_strdup(oid_string);
 905                 info_oid = oid_string;
 906         } else {
 907                 repr  = ep_strdup("[Bad OID]");
 908         }
 909
 910         valstr = strstr(label,": ");
 911         valstr = valstr ? valstr+2 : label;
 912
 913         proto_item_set_text(pi_varbind,"%s: %s",repr,valstr);
 914
 915         if (display_oid && info_oid) {
 916           col_append_fstr (actx->pinfo->cinfo, COL_INFO, " %s", info_oid);
 917         }
 918
 919         switch (format_error) {
 920                 case BER_WRONG_LENGTH: {
 921                         proto_tree* pt = proto_item_add_subtree(pi_value,ett_decoding_error);
 922                         proto_item* pi = proto_tree_add_text(pt,tvb,0,0,"Wrong value length: %u  expecting: %u <= len <= %u",
 923                                                              value_len, min_len, max_len == -1 ? 0xFFFFFF : max_len);
 924                         pt = proto_item_add_subtree(pi,ett_decoding_error);
 925                         expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "Wrong length for SNMP VarBind/value");
 926                         return dissect_unknown_ber(actx->pinfo, tvb, value_start, pt);
 927                 }
 928                 case BER_WRONG_TAG: {
 929                         proto_tree* pt = proto_item_add_subtree(pi_value,ett_decoding_error);
 930                         proto_item* pi = proto_tree_add_text(pt,tvb,0,0,"Wrong class/tag for Value expected: %d,%d got: %d,%d",
 931                                                              oid_info->value_type->ber_class, oid_info->value_type->ber_tag,
 932                                                              ber_class, tag);
 933                         pt = proto_item_add_subtree(pi,ett_decoding_error);
 934                         expert_add_info_format(actx->pinfo, pi, PI_MALFORMED, PI_WARN, "Wrong class/tag for SNMP VarBind/value");
 935                         return dissect_unknown_ber(actx->pinfo, tvb, value_start, pt);
 936                 }
 937                 default:
 938                         break;
 939         }
 940
 941         return seq_offset + seq_len;
 942 }
 943
 944
 945 #define F_SNMP_ENGINEID_CONFORM 0x80
 946 #define SNMP_ENGINEID_RFC1910 0x00
 947 #define SNMP_ENGINEID_RFC3411 0x01
 948
 949 static const true_false_string tfs_snmp_engineid_conform = {
 950   "RFC3411 (SNMPv3)",
 951   "RFC1910 (Non-SNMPv3)"
 952 };
 953
 954 #define SNMP_ENGINEID_FORMAT_IPV4 0x01
 955 #define SNMP_ENGINEID_FORMAT_IPV6 0x02
 956 #define SNMP_ENGINEID_FORMAT_MACADDRESS 0x03
 957 #define SNMP_ENGINEID_FORMAT_TEXT 0x04
 958 #define SNMP_ENGINEID_FORMAT_OCTETS 0x05
 959
 960 static const value_string snmp_engineid_format_vals[] = {
 961         { SNMP_ENGINEID_FORMAT_IPV4,    "IPv4 address" },
 962         { SNMP_ENGINEID_FORMAT_IPV6,    "IPv6 address" },
 963         { SNMP_ENGINEID_FORMAT_MACADDRESS,      "MAC address" },
 964         { SNMP_ENGINEID_FORMAT_TEXT,    "Text, administratively assigned" },
 965         { SNMP_ENGINEID_FORMAT_OCTETS,  "Octets, administratively assigned" },
 966         { 0,    NULL }
 967 };
 968
 969 #define SNMP_ENGINEID_CISCO_AGENT 0x00
 970 #define SNMP_ENGINEID_CISCO_MANAGER 0x01
 971
 972 static const value_string snmp_engineid_cisco_type_vals[] = {
 973         { SNMP_ENGINEID_CISCO_AGENT,    "Agent" },
 974         { SNMP_ENGINEID_CISCO_MANAGER,  "Manager" },
 975         { 0,    NULL }
 976 };
 977
 978 /*
 979  * SNMP Engine ID dissection according to RFC 3411 (SnmpEngineID TC)
 980  * or historic RFC 1910 (AgentID)
 981  */
 982 int
 983 dissect_snmp_engineid(proto_tree *tree, tvbuff_t *tvb, int offset, int len)
 984 {
 985     proto_item *item = NULL;
 986     guint8 conformance, format;
 987     guint32 enterpriseid, seconds;
 988     nstime_t ts;
 989     int len_remain = len;
 990
 991     /* first bit: engine id conformance */
 992     if (len_remain<4) return offset;
 993     conformance = ((tvb_get_guint8(tvb, offset)>>7) & 0x01);
 994     proto_tree_add_item(tree, hf_snmp_engineid_conform, tvb, offset, 1, ENC_BIG_ENDIAN);
 995
 996     /* 4-byte enterprise number/name */
 997     if (len_remain<4) return offset;
 998     enterpriseid = tvb_get_ntohl(tvb, offset);
 999     if (conformance)
1000       enterpriseid -= 0x80000000; /* ignore first bit */
1001     proto_tree_add_uint(tree, hf_snmp_engineid_enterprise, tvb, offset, 4, enterpriseid);
1002     offset+=4;
1003     len_remain-=4;
1004
1005     switch(conformance) {
1006
1007     case SNMP_ENGINEID_RFC1910:
1008       /* 12-byte AgentID w/ 8-byte trailer */
1009       if (len_remain==8) {
1010         proto_tree_add_text(tree, tvb, offset, 8, "AgentID Trailer: 0x%s",
1011                             tvb_bytes_to_str(tvb, offset, 8));
1012         offset+=8;
1013         len_remain-=8;
1014       } else {
1015         proto_tree_add_text(tree, tvb, offset, len_remain, "<Data not conforming to RFC1910>");
1016         return offset;
1017       }
1018       break;
1019
1020     case SNMP_ENGINEID_RFC3411: /* variable length: 5..32 */
1021
1022       /* 1-byte format specifier */
1023       if (len_remain<1) return offset;
1024       format = tvb_get_guint8(tvb, offset);
1025       item = proto_tree_add_uint_format(tree, hf_snmp_engineid_format, tvb, offset, 1, format, "Engine ID Format: %s (%d)",
1026                                         val_to_str(format, snmp_engineid_format_vals, "Reserved/Enterprise-specific"), format);
1027       offset+=1;
1028       len_remain-=1;
1029
1030       switch(format) {
1031       case SNMP_ENGINEID_FORMAT_IPV4:
1032         /* 4-byte IPv4 address */
1033         if (len_remain==4) {
1034           proto_tree_add_item(tree, hf_snmp_engineid_ipv4, tvb, offset, 4, ENC_BIG_ENDIAN);
1035           offset+=4;
1036           len_remain=0;
1037         }
1038         break;
1039       case SNMP_ENGINEID_FORMAT_IPV6:
1040         /* 16-byte IPv6 address */
1041         if (len_remain==16) {
1042           proto_tree_add_item(tree, hf_snmp_engineid_ipv6, tvb, offset, 16, ENC_NA);
1043           offset+=16;
1044           len_remain=0;
1045         }
1046         break;
1047       case SNMP_ENGINEID_FORMAT_MACADDRESS:
1048         /* See: https://supportforums.cisco.com/message/3010617#3010617 for details. */
1049         if ((enterpriseid==9)&&(len_remain==7)) {
1050           proto_tree_add_item(tree, hf_snmp_engineid_cisco_type, tvb, offset, 1, ENC_BIG_ENDIAN);
1051           offset++;
1052           len_remain--;
1053         }
1054         /* 6-byte MAC address */
1055         if (len_remain==6) {
1056           proto_tree_add_item(tree, hf_snmp_engineid_mac, tvb, offset, 6, ENC_NA);
1057           offset+=6;
1058           len_remain=0;
1059         }
1060         break;
1061       case SNMP_ENGINEID_FORMAT_TEXT:
1062         /* max. 27-byte string, administratively assigned */
1063         if (len_remain<=27) {
1064           proto_tree_add_item(tree, hf_snmp_engineid_text, tvb, offset, len_remain, ENC_ASCII|ENC_NA);
1065           offset+=len_remain;
1066           len_remain=0;
1067         }
1068         break;
1069       case 128:
1070         /* most common enterprise-specific format: (ucd|net)-snmp random */
1071         if ((enterpriseid==2021)||(enterpriseid==8072)) {
1072           proto_item_append_text(item, (enterpriseid==2021) ? ": UCD-SNMP Random" : ": Net-SNMP Random");
1073           /* demystify: 4B random, 4B epoch seconds */
1074           if (len_remain==8) {
1075             proto_tree_add_item(tree, hf_snmp_engineid_data, tvb, offset, 4, ENC_NA);
1076             seconds = tvb_get_letohl(tvb, offset+4);
1077             ts.secs = seconds;
1078             ts.nsecs = 0;
1079             proto_tree_add_time_format_value(tree, hf_snmp_engineid_time, tvb, offset+4, 4,
1080                                              &ts, "%s",
1081                                              abs_time_secs_to_str(seconds, ABSOLUTE_TIME_LOCAL, TRUE));
1082             offset+=8;
1083             len_remain=0;
1084           }
1085         }
1086         break;
1087       case SNMP_ENGINEID_FORMAT_OCTETS:
1088       default:
1089         /* max. 27 bytes, administratively assigned or unknown format */
1090         if (len_remain<=27) {
1091           proto_tree_add_item(tree, hf_snmp_engineid_data, tvb, offset, len_remain, ENC_NA);
1092           offset+=len_remain;
1093           len_remain=0;
1094         }
1095         break;
1096       }
1097     }
1098
1099     if (len_remain>0) {
1100       proto_tree_add_text(tree, tvb, offset, len_remain, "<Data not conforming to RFC3411>");
1101       offset+=len_remain;
1102     }
1103     return offset;
1104 }
1105
1106
1107 static void set_ue_keys(snmp_ue_assoc_t* n ) {
1108         guint key_size = n->user.authModel->key_size;
1109
1110         n->user.authKey.data = se_alloc(key_size);
1111         n->user.authKey.len = key_size;
1112         n->user.authModel->pass2key(n->user.authPassword.data,
1113                                     n->user.authPassword.len,
1114                                     n->engine.data,
1115                                     n->engine.len,
1116                                     n->user.authKey.data);
1117
1118         n->user.privKey.data = se_alloc(key_size);
1119         n->user.privKey.len = key_size;
1120         n->user.authModel->pass2key(n->user.privPassword.data,
1121                                     n->user.privPassword.len,
1122                                     n->engine.data,
1123                                     n->engine.len,
1124                                     n->user.privKey.data);
1125 }
1126
1127 static snmp_ue_assoc_t*
1128 ue_se_dup(snmp_ue_assoc_t* o)
1129 {
1130         snmp_ue_assoc_t* d = se_memdup(o,sizeof(snmp_ue_assoc_t));
1131
1132         d->user.authModel = o->user.authModel;
1133
1134         d->user.privProtocol = o->user.privProtocol;
1135
1136         d->user.userName.data = se_memdup(o->user.userName.data,o->user.userName.len);
1137         d->user.userName.len = o->user.userName.len;
1138
1139         d->user.authPassword.data = o->user.authPassword.data ? se_memdup(o->user.authPassword.data,o->user.authPassword.len) : NULL;
1140         d->user.authPassword.len = o->user.authPassword.len;
1141
1142         d->user.privPassword.data = o->user.privPassword.data ? se_memdup(o->user.privPassword.data,o->user.privPassword.len) : NULL;
1143         d->user.privPassword.len = o->user.privPassword.len;
1144
1145         d->engine.len = o->engine.len;
1146
1147         if (d->engine.len) {
1148                 d->engine.data = se_memdup(o->engine.data,o->engine.len);
1149                 set_ue_keys(d);
1150         }
1151
1152         return d;
1153
1154 }
1155
1156
1157 #define CACHE_INSERT(c,a) if (c) { snmp_ue_assoc_t* t = c; c = a; c->next = t; } else { c = a; a->next = NULL; }
1158
1159 static void
1160 renew_ue_cache(void)
1161 {
1162         localized_ues = NULL;
1163         unlocalized_ues = NULL;
1164
1165         if (num_ueas) {
1166                 guint i;
1167
1168                 for(i = 0; i < num_ueas; i++) {
1169                         snmp_ue_assoc_t* a = ue_se_dup(&(ueas[i]));
1170
1171                         if (a->engine.len) {
1172                                 CACHE_INSERT(localized_ues,a);
1173
1174                         } else {
1175                                 CACHE_INSERT(unlocalized_ues,a);
1176                         }
1177
1178                 }
1179         }
1180 }
1181
1182
1183 static snmp_ue_assoc_t*
1184 localize_ue( snmp_ue_assoc_t* o, const guint8* engine, guint engine_len )
1185 {
1186         snmp_ue_assoc_t* n = se_memdup(o,sizeof(snmp_ue_assoc_t));
1187
1188         n->engine.data = se_memdup(engine,engine_len);
1189         n->engine.len = engine_len;
1190
1191         set_ue_keys(n);
1192
1193         return n;
1194 }
1195
1196
1197 #define localized_match(a,u,ul,e,el) \
1198         ( a->user.userName.len == ul \
1199         && a->engine.len == el \
1200         && memcmp( a->user.userName.data, u, ul ) == 0 \
1201         && memcmp( a->engine.data,   e,  el ) == 0 )
1202
1203 #define unlocalized_match(a,u,l) \
1204         ( a->user.userName.len == l && memcmp( a->user.userName.data, u, l) == 0 )
1205
1206 static snmp_ue_assoc_t*
1207 get_user_assoc(tvbuff_t* engine_tvb, tvbuff_t* user_tvb)
1208 {
1209         static snmp_ue_assoc_t* a;
1210         guint given_username_len;
1211         guint8* given_username;
1212         guint given_engine_len;
1213         guint8* given_engine;
1214
1215         if ( ! (localized_ues || unlocalized_ues ) ) return NULL;
1216
1217         if (! ( user_tvb && engine_tvb ) ) return NULL;
1218
1219         given_username_len = tvb_ensure_length_remaining(user_tvb,0);
1220         given_username = ep_tvb_memdup(user_tvb,0,-1);
1221         given_engine_len = tvb_ensure_length_remaining(engine_tvb,0);
1222         given_engine = ep_tvb_memdup(engine_tvb,0,-1);
1223
1224         for (a = localized_ues; a; a = a->next) {
1225                 if ( localized_match(a, given_username, given_username_len, given_engine, given_engine_len) ) {
1226                         return a;
1227                 }
1228         }
1229
1230         for (a = unlocalized_ues; a; a = a->next) {
1231                 if ( unlocalized_match(a, given_username, given_username_len) ) {
1232                         snmp_ue_assoc_t* n = localize_ue( a, given_engine, given_engine_len );
1233                         CACHE_INSERT(localized_ues,n);
1234                         return n;
1235                 }
1236         }
1237
1238         return NULL;
1239 }
1240
1241 static gboolean
1242 snmp_usm_auth_md5(snmp_usm_params_t* p, guint8** calc_auth_p, guint* calc_auth_len_p, gchar const** error)
1243 {
1244         guint msg_len;
1245         guint8* msg;
1246         guint auth_len;
1247         guint8* auth;
1248         guint8* key;
1249         guint key_len;
1250         guint8 *calc_auth;
1251         guint start;
1252         guint end;
1253         guint i;
1254
1255         if (!p->auth_tvb) {
1256                 *error = "No Authenticator";
1257                 return FALSE;
1258         }
1259
1260         key = p->user_assoc->user.authKey.data;
1261         key_len = p->user_assoc->user.authKey.len;
1262
1263         if (! key ) {
1264                 *error = "User has no authKey";
1265                 return FALSE;
1266         }
1267
1268
1269         auth_len = tvb_length_remaining(p->auth_tvb,0);
1270
1271         if (auth_len != 12) {
1272                 *error = "Authenticator length wrong";
1273                 return FALSE;
1274         }
1275
1276         msg_len = tvb_length_remaining(p->msg_tvb,0);
1277         msg = ep_tvb_memdup(p->msg_tvb,0,msg_len);
1278
1279
1280         auth = ep_tvb_memdup(p->auth_tvb,0,auth_len);
1281
1282         start = p->auth_offset - p->start_offset;
1283         end =   start + auth_len;
1284
1285         /* fill the authenticator with zeros */
1286         for ( i = start ; i < end ; i++ ) {
1287                 msg[i] = '\0';
1288         }
1289
1290         calc_auth = ep_alloc(16);
1291
1292         md5_hmac(msg, msg_len, key, key_len, calc_auth);
1293
1294         if (calc_auth_p) *calc_auth_p = calc_auth;
1295         if (calc_auth_len_p) *calc_auth_len_p = 12;
1296
1297         return ( memcmp(auth,calc_auth,12) != 0 ) ? FALSE : TRUE;
1298 }
1299
1300
1301 static gboolean
1302 snmp_usm_auth_sha1(snmp_usm_params_t* p _U_, guint8** calc_auth_p, guint* calc_auth_len_p,  gchar const** error _U_)
1303 {
1304         guint msg_len;
1305         guint8* msg;
1306         guint auth_len;
1307         guint8* auth;
1308         guint8* key;
1309         guint key_len;
1310         guint8 *calc_auth;
1311         guint start;
1312         guint end;
1313         guint i;
1314
1315         if (!p->auth_tvb) {
1316                 *error = "No Authenticator";
1317                 return FALSE;
1318         }
1319
1320         key = p->user_assoc->user.authKey.data;
1321         key_len = p->user_assoc->user.authKey.len;
1322
1323         if (! key ) {
1324                 *error = "User has no authKey";
1325                 return FALSE;
1326         }
1327
1328
1329         auth_len = tvb_length_remaining(p->auth_tvb,0);
1330
1331
1332         if (auth_len != 12) {
1333                 *error = "Authenticator length wrong";
1334                 return FALSE;
1335         }
1336
1337         msg_len = tvb_length_remaining(p->msg_tvb,0);
1338         msg = ep_tvb_memdup(p->msg_tvb,0,msg_len);
1339
1340         auth = ep_tvb_memdup(p->auth_tvb,0,auth_len);
1341
1342         start = p->auth_offset - p->start_offset;
1343         end =   start + auth_len;
1344
1345         /* fill the authenticator with zeros */
1346         for ( i = start ; i < end ; i++ ) {
1347                 msg[i] = '\0';
1348         }
1349
1350         calc_auth = ep_alloc(20);
1351
1352         sha1_hmac(key, key_len, msg, msg_len, calc_auth);
1353
1354         if (calc_auth_p) *calc_auth_p = calc_auth;
1355         if (calc_auth_len_p) *calc_auth_len_p = 12;
1356
1357         return ( memcmp(auth,calc_auth,12) != 0 ) ? FALSE : TRUE;
1358 }
1359
1360 static tvbuff_t*
1361 snmp_usm_priv_des(snmp_usm_params_t* p _U_, tvbuff_t* encryptedData _U_, gchar const** error _U_)
1362 {
1363 #ifdef HAVE_LIBGCRYPT
1364     gcry_error_t err;
1365     gcry_cipher_hd_t hd = NULL;
1366
1367         guint8* cleartext;
1368         guint8* des_key = p->user_assoc->user.privKey.data; /* first 8 bytes */
1369         guint8* pre_iv = &(p->user_assoc->user.privKey.data[8]); /* last 8 bytes */
1370         guint8* salt;
1371         gint salt_len;
1372         gint cryptgrm_len;
1373         guint8* cryptgrm;
1374         tvbuff_t* clear_tvb;
1375         guint8 iv[8];
1376         guint i;
1377
1378
1379         salt_len = tvb_length_remaining(p->priv_tvb,0);
1380
1381         if (salt_len != 8)  {
1382                 *error = "decryptionError: msgPrivacyParameters length != 8";
1383                 return NULL;
1384         }
1385
1386         salt = ep_tvb_memdup(p->priv_tvb,0,salt_len);
1387
1388         /*
1389          The resulting "salt" is XOR-ed with the pre-IV to obtain the IV.
1390          */
1391         for (i=0; i<8; i++) {
1392                 iv[i] = pre_iv[i] ^ salt[i];
1393         }
1394
1395         cryptgrm_len = tvb_length_remaining(encryptedData,0);
1396
1397         if (cryptgrm_len % 8) {
1398                 *error = "decryptionError: the length of the encrypted data is not a mutiple of 8 octets";
1399                 return NULL;
1400         }
1401
1402         cryptgrm = ep_tvb_memdup(encryptedData,0,-1);
1403
1404         cleartext = ep_alloc(cryptgrm_len);
1405
1406         err = gcry_cipher_open(&hd, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_CBC, 0);
1407         if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1408
1409         err = gcry_cipher_setiv(hd, iv, 8);
1410         if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1411
1412         err = gcry_cipher_setkey(hd,des_key,8);
1413         if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1414
1415         err = gcry_cipher_decrypt(hd, cleartext, cryptgrm_len, cryptgrm, cryptgrm_len);
1416         if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1417
1418         gcry_cipher_close(hd);
1419
1420         clear_tvb = tvb_new_child_real_data(encryptedData, cleartext, cryptgrm_len, cryptgrm_len);
1421
1422         return clear_tvb;
1423
1424 on_gcry_error:
1425         *error = (void*)gpg_strerror(err);
1426         if (hd) gcry_cipher_close(hd);
1427         return NULL;
1428 #else
1429         *error = "libgcrypt not present, cannot decrypt";
1430         return NULL;
1431 #endif
1432 }
1433
1434 static tvbuff_t*
1435 snmp_usm_priv_aes(snmp_usm_params_t* p _U_, tvbuff_t* encryptedData _U_, gchar const** error _U_)
1436 {
1437 #ifdef HAVE_LIBGCRYPT
1438         gcry_error_t err;
1439         gcry_cipher_hd_t hd = NULL;
1440
1441         guint8* cleartext;
1442         guint8* aes_key = p->user_assoc->user.privKey.data; /* first 16 bytes */
1443         guint8 iv[16];
1444         gint priv_len;
1445         gint cryptgrm_len;
1446         guint8* cryptgrm;
1447         tvbuff_t* clear_tvb;
1448
1449         priv_len = tvb_length_remaining(p->priv_tvb,0);
1450
1451         if (priv_len != 8)  {
1452                 *error = "decryptionError: msgPrivacyParameters length != 8";
1453                 return NULL;
1454         }
1455
1456         iv[0] = (p->boots & 0xff000000) >> 24;
1457         iv[1] = (p->boots & 0x00ff0000) >> 16;
1458         iv[2] = (p->boots & 0x0000ff00) >> 8;
1459         iv[3] = (p->boots & 0x000000ff);
1460         iv[4] = (p->time & 0xff000000) >> 24;
1461         iv[5] = (p->time & 0x00ff0000) >> 16;
1462         iv[6] = (p->time & 0x0000ff00) >> 8;
1463         iv[7] = (p->time & 0x000000ff);
1464         tvb_memcpy(p->priv_tvb,&(iv[8]),0,8);
1465
1466         cryptgrm_len = tvb_length_remaining(encryptedData,0);
1467         cryptgrm = ep_tvb_memdup(encryptedData,0,-1);
1468
1469         cleartext = ep_alloc(cryptgrm_len);
1470
1471         err = gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CFB, 0);
1472         if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1473
1474         err = gcry_cipher_setiv(hd, iv, 16);
1475         if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1476
1477         err = gcry_cipher_setkey(hd,aes_key,16);
1478         if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1479
1480         err = gcry_cipher_decrypt(hd, cleartext, cryptgrm_len, cryptgrm, cryptgrm_len);
1481         if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
1482
1483         gcry_cipher_close(hd);
1484
1485         clear_tvb = tvb_new_child_real_data(encryptedData, cleartext, cryptgrm_len, cryptgrm_len);
1486
1487         return clear_tvb;
1488
1489 on_gcry_error:
1490         *error = (void*)gpg_strerror(err);
1491         if (hd) gcry_cipher_close(hd);
1492         return NULL;
1493 #else
1494         *error = "libgcrypt not present, cannot decrypt";
1495         return NULL;
1496 #endif
1497 }
1498
1499
1500 gboolean
1501 check_ScopedPdu(tvbuff_t* tvb)
1502 {
1503         int offset;
1504         gint8 ber_class;
1505         gboolean pc;
1506         gint32 tag;
1507         int hoffset, eoffset;
1508         guint32 len;
1509
1510         offset = get_ber_identifier(tvb, 0, &ber_class, &pc, &tag);
1511         offset = get_ber_length(tvb, offset, NULL, NULL);
1512
1513         if ( ! (((ber_class!=BER_CLASS_APP) && (ber_class!=BER_CLASS_PRI) )
1514                         && ( (!pc) || (ber_class!=BER_CLASS_UNI) || (tag!=BER_UNI_TAG_ENUMERATED) )
1515                         )) return FALSE;
1516
1517         if((tvb_get_guint8(tvb, offset)==0)&&(tvb_get_guint8(tvb, offset+1)==0))
1518                 return TRUE;
1519
1520         hoffset = offset;
1521
1522         offset = get_ber_identifier(tvb, offset, &ber_class, &pc, &tag);
1523         offset = get_ber_length(tvb, offset, &len, NULL);
1524         eoffset = offset + len;
1525
1526         if (eoffset <= hoffset) return FALSE;
1527
1528         if ((ber_class!=BER_CLASS_APP)&&(ber_class!=BER_CLASS_PRI))
1529                 if( (ber_class!=BER_CLASS_UNI)
1530                         ||((tag<BER_UNI_TAG_NumericString)&&(tag!=BER_UNI_TAG_OCTETSTRING)&&(tag!=BER_UNI_TAG_UTF8String)) )
1531                         return FALSE;
1532
1533         return TRUE;
1534
1535 }
1536
1537 #include "packet-snmp-fn.c"
1538
1539
1540 guint
1541 dissect_snmp_pdu(tvbuff_t *tvb, int offset, packet_info *pinfo,
1542                  proto_tree *tree, int proto, gint ett, gboolean is_tcp)
1543 {
1544
1545         guint length_remaining;
1546         gint8 ber_class;
1547         gboolean pc, ind = 0;
1548         gint32 tag;
1549         guint32 len;
1550         guint message_length;
1551         int start_offset = offset;
1552         guint32 version = 0;
1553         tvbuff_t        *next_tvb;
1554
1555         proto_tree *snmp_tree = NULL;
1556         proto_item *item = NULL;
1557         asn1_ctx_t asn1_ctx;
1558         asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
1559
1560
1561         usm_p.msg_tvb = tvb;
1562         usm_p.start_offset = tvb_offset_from_real_beginning(tvb);
1563         usm_p.engine_tvb = NULL;
1564         usm_p.user_tvb = NULL;
1565         usm_p.auth_item = NULL;
1566         usm_p.auth_tvb = NULL;
1567         usm_p.auth_offset = 0;
1568         usm_p.priv_tvb = NULL;
1569         usm_p.user_assoc = NULL;
1570         usm_p.authenticated = FALSE;
1571         usm_p.encrypted = FALSE;
1572         usm_p.boots = 0;
1573         usm_p.time = 0;
1574         usm_p.authOK = FALSE;
1575
1576         /*
1577          * This will throw an exception if we don't have any data left.
1578          * That's what we want.  (See "tcp_dissect_pdus()", which is
1579          * similar, but doesn't have to deal with ASN.1.
1580          * XXX - can we make "tcp_dissect_pdus()" provide enough
1581          * information to the "get_pdu_len" routine so that we could
1582          * have that routine deal with ASN.1, and just use
1583          * "tcp_dissect_pdus()"?)
1584          */
1585         length_remaining = tvb_ensure_length_remaining(tvb, offset);
1586
1587         /* NOTE: we have to parse the message piece by piece, since the
1588          * capture length may be less than the message length: a 'global'
1589          * parsing is likely to fail.
1590          */
1591
1592         /*
1593          * If this is SNMP-over-TCP, we might have to do reassembly
1594          * in order to read the "Sequence Of" header.
1595          */
1596         if (is_tcp && snmp_desegment && pinfo->can_desegment) {
1597                 /*
1598                  * This is TCP, and we should, and can, do reassembly.
1599                  *
1600                  * Is the "Sequence Of" header split across segment
1601                  * boundaries?  We require at least 6 bytes for the
1602                  * header, which allows for a 4-byte length (ASN.1
1603                  * BER).
1604                  */
1605                 if (length_remaining < 6) {
1606                         /*
1607                          * Yes.  Tell the TCP dissector where the data
1608                          * for this message starts in the data it handed
1609                          * us and that we need "some more data."  Don't tell
1610                          * it exactly how many bytes we need because if/when
1611                          * we ask for even more (after the header) that will
1612                          * break reassembly.
1613                          */
1614                         pinfo->desegment_offset = offset;
1615                         pinfo->desegment_len = DESEGMENT_ONE_MORE_SEGMENT;
1616
1617                         /*
1618                          * Return 0, which means "I didn't dissect anything
1619                          * because I don't have enough data - we need
1620                          * to desegment".
1621                          */
1622                         return 0;
1623                 }
1624         }
1625
1626         /*
1627          * OK, try to read the "Sequence Of" header; this gets the total
1628          * length of the SNMP message.
1629          */
1630         /* Set tree to 0 to not display internal BER fields if option used.*/
1631         offset = dissect_ber_identifier(pinfo, 0, tvb, offset, &ber_class, &pc, &tag);
1632         /*Get the total octet length of the SNMP data*/
1633         offset = dissect_ber_length(pinfo, 0, tvb, offset, &len, &ind);
1634         message_length = len + 2;
1635
1636         /*Get the SNMP version data*/
1637         offset = dissect_ber_integer(FALSE, &asn1_ctx, 0, tvb, offset, -1, &version);
1638
1639
1640         /*
1641          * If this is SNMP-over-TCP, we might have to do reassembly
1642          * to get all of this message.
1643          */
1644         if (is_tcp && snmp_desegment && pinfo->can_desegment) {
1645                 /*
1646                  * Yes - is the message split across segment boundaries?
1647                  */
1648                 if (length_remaining < message_length) {
1649                         /*
1650                          * Yes.  Tell the TCP dissector where the data
1651                          * for this message starts in the data it handed
1652                          * us, and how many more bytes we need, and
1653                          * return.
1654                          */
1655                         pinfo->desegment_offset = start_offset;
1656                         pinfo->desegment_len =
1657                         message_length - length_remaining;
1658
1659                         /*
1660                          * Return 0, which means "I didn't dissect anything
1661                          * because I don't have enough data - we need
1662                          * to desegment".
1663                          */
1664                         return 0;
1665                 }
1666         }
1667
1668         next_tvb_init(&var_list);
1669
1670         col_set_str(pinfo->cinfo, COL_PROTOCOL,
1671             proto_get_protocol_short_name(find_protocol_by_id(proto)));
1672
1673         if (tree) {
1674                 item = proto_tree_add_item(tree, proto, tvb, start_offset,
1675                                            message_length, ENC_BIG_ENDIAN);
1676                 snmp_tree = proto_item_add_subtree(item, ett);
1677         }
1678
1679         switch (version) {
1680         case 0: /* v1 */
1681         case 1: /* v2c */
1682                 offset = dissect_snmp_Message(FALSE , tvb, start_offset, &asn1_ctx, snmp_tree, -1);
1683                 break;
1684         case 2: /* v2u */
1685                 offset = dissect_snmp_Messagev2u(FALSE , tvb, start_offset, &asn1_ctx, snmp_tree, -1);
1686                 break;
1687                         /* v3 */
1688         case 3:
1689                 offset = dissect_snmp_SNMPv3Message(FALSE , tvb, start_offset, &asn1_ctx, snmp_tree, -1);
1690                 break;
1691         default:
1692                 /*
1693                  * Return the length remaining in the tvbuff, so
1694                  * if this is SNMP-over-TCP, our caller thinks there's
1695                  * nothing left to dissect.
1696                  */
1697                 proto_tree_add_text(snmp_tree, tvb, offset, -1,"Unknown version");
1698                 return length_remaining;
1699                 break;
1700         }
1701
1702         /* There may be appended data after the SNMP data, so treat as raw
1703          * data which needs to be dissected in case of UDP as UDP is PDU oriented.
1704          */
1705         if((!is_tcp) && (length_remaining > (guint)offset)) {
1706                 next_tvb = tvb_new_subset_remaining(tvb, offset);
1707                 call_dissector(data_handle, next_tvb, pinfo, tree);
1708         } else {
1709                 next_tvb_call(&var_list, pinfo, tree, NULL, data_handle);
1710         }
1711
1712         return offset;
1713 }
1714
1715 static gint
1716 dissect_snmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1717 {
1718         conversation_t  *conversation;
1719         int offset;
1720         gint8 tmp_class;
1721         gboolean tmp_pc;
1722         gint32 tmp_tag;
1723         guint32 tmp_length;
1724         gboolean tmp_ind;
1725
1726         /*
1727          * See if this looks like SNMP or not. if not, return 0 so
1728          * wireshark can try som other dissector instead.
1729          */
1730         /* All SNMP packets are BER encoded and consist of a SEQUENCE
1731          * that spans the entire PDU. The first item is an INTEGER that
1732          * has the values 0-2 (version 1-3).
1733          * if not it is not snmp.
1734          */
1735         /* SNMP starts with a SEQUENCE */
1736         offset = get_ber_identifier(tvb, 0, &tmp_class, &tmp_pc, &tmp_tag);
1737         if((tmp_class!=BER_CLASS_UNI)||(tmp_tag!=BER_UNI_TAG_SEQUENCE)) {
1738                 return 0;
1739         }
1740         /* then comes a length which spans the rest of the tvb */
1741         offset = get_ber_length(tvb, offset, &tmp_length, &tmp_ind);
1742         /* if(tmp_length!=(guint32)tvb_reported_length_remaining(tvb, offset)) {
1743          * Losen the heuristic a bit to handle the case where data has intentionally
1744          * been added after the snmp PDU ( UDP case)
1745          */
1746         if ( pinfo->ptype == PT_UDP ) {
1747                 if(tmp_length>(guint32)tvb_reported_length_remaining(tvb, offset)) {
1748                         return 0;
1749                 }
1750         }else{
1751                 if(tmp_length!=(guint32)tvb_reported_length_remaining(tvb, offset)) {
1752                         return 0;
1753                 }
1754         }
1755         /* then comes an INTEGER (version)*/
1756         get_ber_identifier(tvb, offset, &tmp_class, &tmp_pc, &tmp_tag);
1757         if((tmp_class!=BER_CLASS_UNI)||(tmp_tag!=BER_UNI_TAG_INTEGER)) {
1758                 return 0;
1759         }
1760         /* do we need to test that version is 0 - 2 (version1-3) ? */
1761
1762
1763         /*
1764          * The first SNMP packet goes to the SNMP port; the second one
1765          * may come from some *other* port, but goes back to the same
1766          * IP address and port as the ones from which the first packet
1767          * came; all subsequent packets presumably go between those two
1768          * IP addresses and ports.
1769          *
1770          * If this packet went to the SNMP port, we check to see if
1771          * there's already a conversation with one address/port pair
1772          * matching the source IP address and port of this packet,
1773          * the other address matching the destination IP address of this
1774          * packet, and any destination port.
1775          *
1776          * If not, we create one, with its address 1/port 1 pair being
1777          * the source address/port of this packet, its address 2 being
1778          * the destination address of this packet, and its port 2 being
1779          * wildcarded, and give it the SNMP dissector as a dissector.
1780          */
1781         if (pinfo->destport == UDP_PORT_SNMP) {
1782           conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst, PT_UDP,
1783                                            pinfo->srcport, 0, NO_PORT_B);
1784           if( (conversation == NULL) || (conversation->dissector_handle!=snmp_handle) ) {
1785             conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst, PT_UDP,
1786                                             pinfo->srcport, 0, NO_PORT2);
1787             conversation_set_dissector(conversation, snmp_handle);
1788           }
1789         }
1790
1791         return dissect_snmp_pdu(tvb, 0, pinfo, tree, proto_snmp, ett_snmp, FALSE);
1792 }
1793
1794 static void
1795 dissect_snmp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1796 {
1797         int offset = 0;
1798         guint message_len;
1799
1800         while (tvb_reported_length_remaining(tvb, offset) > 0) {
1801                 message_len = dissect_snmp_pdu(tvb, 0, pinfo, tree,
1802                                                proto_snmp, ett_snmp, TRUE);
1803                 if (message_len == 0) {
1804                         /*
1805                          * We don't have all the data for that message,
1806                          * so we need to do desegmentation;
1807                          * "dissect_snmp_pdu()" has set that up.
1808                          */
1809                         break;
1810                 }
1811                 offset += message_len;
1812         }
1813 }
1814
1815 static void
1816 dissect_smux(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1817 {
1818         proto_tree *smux_tree = NULL;
1819         proto_item *item = NULL;
1820
1821         next_tvb_init(&var_list);
1822
1823         col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMUX");
1824
1825         if (tree) {
1826                 item = proto_tree_add_item(tree, proto_smux, tvb, 0, -1, ENC_NA);
1827                 smux_tree = proto_item_add_subtree(item, ett_smux);
1828         }
1829
1830         dissect_SMUX_PDUs_PDU(tvb, pinfo, smux_tree);
1831 }
1832
1833
1834 /*
1835   MD5 Password to Key Algorithm
1836   from RFC 3414 A.2.1
1837 */
1838 static void
1839 snmp_usm_password_to_key_md5(const guint8 *password, guint passwordlen,
1840                              const guint8 *engineID, guint   engineLength,
1841                              guint8 *key)
1842 {
1843         md5_state_t     MD;
1844         guint8     *cp, password_buf[64];
1845         guint32      password_index = 0;
1846         guint32      count = 0, i;
1847         guint8          key1[16];
1848         md5_init(&MD);   /* initialize MD5 */
1849
1850         /**********************************************/
1851         /* Use while loop until we've done 1 Megabyte */
1852         /**********************************************/
1853         while (count < 1048576) {
1854                 cp = password_buf;
1855                 for (i = 0; i < 64; i++) {
1856                         /*************************************************/
1857                         /* Take the next octet of the password, wrapping */
1858                         /* to the beginning of the password as necessary.*/
1859                         /*************************************************/
1860                         *cp++ = password[password_index++ % passwordlen];
1861                 }
1862                 md5_append(&MD, password_buf, 64);
1863                 count += 64;
1864         }
1865         md5_finish(&MD, key1);          /* tell MD5 we're done */
1866
1867         /*****************************************************/
1868         /* Now localize the key with the engineID and pass   */
1869         /* through MD5 to produce final key                  */
1870         /* We ignore invalid engineLengths here. More strict */
1871         /* checking is done in snmp_users_update_cb.         */
1872         /*****************************************************/
1873
1874         md5_init(&MD);
1875         md5_append(&MD, key1, 16);
1876         md5_append(&MD, engineID, engineLength);
1877         md5_append(&MD, key1, 16);
1878         md5_finish(&MD, key);
1879
1880         return;
1881 }
1882
1883
1884
1885
1886 /*
1887    SHA1 Password to Key Algorithm COPIED from RFC 3414 A.2.2
1888  */
1889
1890 static void
1891 snmp_usm_password_to_key_sha1(const guint8 *password, guint passwordlen,
1892                               const guint8 *engineID, guint engineLength,
1893                               guint8 *key)
1894 {
1895         sha1_context     SH;
1896         guint8     *cp, password_buf[64];
1897         guint32      password_index = 0;
1898         guint32      count = 0, i;
1899
1900         sha1_starts(&SH);   /* initialize SHA */
1901
1902         /**********************************************/
1903         /* Use while loop until we've done 1 Megabyte */
1904         /**********************************************/
1905         while (count < 1048576) {
1906                 cp = password_buf;
1907                 for (i = 0; i < 64; i++) {
1908                         /*************************************************/
1909                         /* Take the next octet of the password, wrapping */
1910                         /* to the beginning of the password as necessary.*/
1911                         /*************************************************/
1912                         *cp++ = password[password_index++ % passwordlen];
1913                 }
1914                 sha1_update (&SH, password_buf, 64);
1915                 count += 64;
1916         }
1917         sha1_finish(&SH, key);
1918
1919         /*****************************************************/
1920         /* Now localize the key with the engineID and pass   */
1921         /* through SHA to produce final key                  */
1922         /* We ignore invalid engineLengths here. More strict */
1923         /* checking is done in snmp_users_update_cb.         */
1924         /*****************************************************/
1925
1926         sha1_starts(&SH);
1927         sha1_update(&SH, key, 20);
1928         sha1_update(&SH, engineID, engineLength);
1929         sha1_update(&SH, key, 20);
1930         sha1_finish(&SH, key);
1931         return;
1932  }
1933
1934
1935 static void
1936 process_prefs(void)
1937 {
1938 }
1939
1940 static void*
1941 snmp_users_copy_cb(void* dest, const void* orig, size_t len _U_)
1942 {
1943         const snmp_ue_assoc_t* o = (const snmp_ue_assoc_t*)orig;
1944         snmp_ue_assoc_t* d = (snmp_ue_assoc_t*)dest;
1945
1946         d->auth_model = o->auth_model;
1947         d->user.authModel = auth_models[o->auth_model];
1948
1949         d->priv_proto = o->priv_proto;
1950         d->user.privProtocol = priv_protos[o->priv_proto];
1951
1952         d->user.userName.data = g_memdup(o->user.userName.data,o->user.userName.len);
1953         d->user.userName.len = o->user.userName.len;
1954
1955         d->user.authPassword.data = o->user.authPassword.data ? g_memdup(o->user.authPassword.data,o->user.authPassword.len) : NULL;
1956         d->user.authPassword.len = o->user.authPassword.len;
1957
1958         d->user.privPassword.data = o->user.privPassword.data ? g_memdup(o->user.privPassword.data,o->user.privPassword.len) : NULL;
1959         d->user.privPassword.len = o->user.privPassword.len;
1960
1961         d->engine.len = o->engine.len;
1962         if (o->engine.data) {
1963                 d->engine.data = g_memdup(o->engine.data,o->engine.len);
1964         }
1965
1966         d->user.authKey.data = o->user.authKey.data ? g_memdup(o->user.authKey.data,o->user.authKey.len) : NULL;
1967         d->user.authKey.len = o->user.authKey.len;
1968
1969         d->user.privKey.data = o->user.privKey.data ? g_memdup(o->user.privKey.data,o->user.privKey.len) : NULL;
1970         d->user.privKey.len = o->user.privKey.len;
1971
1972         return d;
1973 }
1974
1975 static void
1976 snmp_users_free_cb(void* p)
1977 {
1978         snmp_ue_assoc_t* ue = (snmp_ue_assoc_t*)p;
1979         g_free(ue->user.userName.data);
1980         g_free(ue->user.authPassword.data);
1981         g_free(ue->user.privPassword.data);
1982         g_free(ue->user.authKey.data);
1983         g_free(ue->user.privKey.data);
1984         g_free(ue->engine.data);
1985 }
1986
1987 static void
1988 snmp_users_update_cb(void* p _U_, const char** err)
1989 {
1990         snmp_ue_assoc_t* ue = (snmp_ue_assoc_t*)p;
1991         GString* es = g_string_new("");
1992         unsigned i;
1993
1994         *err = NULL;
1995
1996         if (num_ueas == 0)
1997                 /* Nothing to update */
1998                 return;
1999
2000         if (! ue->user.userName.len)
2001                 g_string_append_printf(es,"no userName\n");
2002
2003         for (i=0; i<num_ueas-1; i++) {
2004                 snmp_ue_assoc_t* u = &(ueas[i]);
2005
2006                 /* RFC 3411 section 5 */
2007                 if ((u->engine.len > 0) && (u->engine.len < 5 || u->engine.len > 32)) {
2008                         g_string_append_printf(es, "Invalid engineId length (%u). Must be between 5 and 32 (10 and 64 hex digits)\n", u->engine.len);
2009                 }
2010
2011
2012                 if ( u->user.userName.len == ue->user.userName.len
2013                         && u->engine.len == ue->engine.len ) {
2014
2015                         if (u->engine.len > 0 && memcmp( u->engine.data,   ue->engine.data,  u->engine.len ) == 0) {
2016                                 if ( memcmp( u->user.userName.data, ue->user.userName.data, ue->user.userName.len ) == 0 ) {
2017                                         /* XXX: make a string for the engineId */
2018                                         g_string_append_printf(es,"Duplicate key (userName='%s')\n",ue->user.userName.data);
2019                                 }
2020                         }
2021
2022                         if (u->engine.len == 0) {
2023                                 if ( memcmp( u->user.userName.data, ue->user.userName.data, ue->user.userName.len ) == 0 ) {
2024                                         g_string_append_printf(es,"Duplicate key (userName='%s' engineId=NONE)\n",ue->user.userName.data);
2025                                 }
2026                         }
2027                 }
2028         }
2029
2030         if (es->len) {
2031                 g_string_truncate(es,es->len-1);
2032                 *err = ep_strdup(es->str);
2033         }
2034
2035         g_string_free(es,TRUE);
2036
2037         return;
2038 }
2039
2040
2041 UAT_LSTRING_CB_DEF(snmp_users,userName,snmp_ue_assoc_t,user.userName.data,user.userName.len)
2042 UAT_LSTRING_CB_DEF(snmp_users,authPassword,snmp_ue_assoc_t,user.authPassword.data,user.authPassword.len)
2043 UAT_LSTRING_CB_DEF(snmp_users,privPassword,snmp_ue_assoc_t,user.privPassword.data,user.privPassword.len)
2044 UAT_BUFFER_CB_DEF(snmp_users,engine_id,snmp_ue_assoc_t,engine.data,engine.len)
2045 UAT_VS_DEF(snmp_users,auth_model,snmp_ue_assoc_t,0,"MD5")
2046 UAT_VS_DEF(snmp_users,priv_proto,snmp_ue_assoc_t,0,"DES")
2047
2048 static void *
2049 snmp_specific_trap_copy_cb(void *dest, const void *orig, size_t len _U_)
2050 {
2051         snmp_st_assoc_t *u = (snmp_st_assoc_t *)dest;
2052         const snmp_st_assoc_t *o = (const snmp_st_assoc_t *)orig;
2053
2054         u->enterprise = g_strdup(o->enterprise);
2055         u->trap = o->trap;
2056         u->desc = g_strdup(o->desc);
2057
2058         return dest;
2059 }
2060
2061 static void
2062 snmp_specific_trap_free_cb(void *r)
2063 {
2064         snmp_st_assoc_t *u = (snmp_st_assoc_t *)r;
2065
2066         g_free(u->enterprise);
2067         g_free(u->desc);
2068 }
2069
2070 UAT_CSTRING_CB_DEF(specific_traps, enterprise, snmp_st_assoc_t)
2071 UAT_DEC_CB_DEF(specific_traps, trap, snmp_st_assoc_t)
2072 UAT_CSTRING_CB_DEF(specific_traps, desc, snmp_st_assoc_t)
2073
2074         /*--- proto_register_snmp -------------------------------------------*/
2075 void proto_register_snmp(void) {
2076   /* List of fields */
2077   static hf_register_info hf[] = {
2078                 { &hf_snmp_v3_flags_auth,
2079                 { "Authenticated", "snmp.v3.flags.auth", FT_BOOLEAN, 8,
2080                     TFS(&tfs_set_notset), TH_AUTH, NULL, HFILL }},
2081                 { &hf_snmp_v3_flags_crypt,
2082                 { "Encrypted", "snmp.v3.flags.crypt", FT_BOOLEAN, 8,
2083                     TFS(&tfs_set_notset), TH_CRYPT, NULL, HFILL }},
2084                 { &hf_snmp_v3_flags_report,
2085                 { "Reportable", "snmp.v3.flags.report", FT_BOOLEAN, 8,
2086                     TFS(&tfs_set_notset), TH_REPORT, NULL, HFILL }},
2087                 { &hf_snmp_engineid_conform, {
2088                     "Engine ID Conformance", "snmp.engineid.conform", FT_BOOLEAN, 8,
2089                     TFS(&tfs_snmp_engineid_conform), F_SNMP_ENGINEID_CONFORM, "Engine ID RFC3411 Conformance", HFILL }},
2090                 { &hf_snmp_engineid_enterprise, {
2091                     "Engine Enterprise ID", "snmp.engineid.enterprise", FT_UINT32, BASE_DEC|BASE_EXT_STRING,
2092                     &sminmpec_values_ext, 0, NULL, HFILL }},
2093                 { &hf_snmp_engineid_format, {
2094                     "Engine ID Format", "snmp.engineid.format", FT_UINT8, BASE_DEC,
2095                     VALS(snmp_engineid_format_vals), 0, NULL, HFILL }},
2096                 { &hf_snmp_engineid_ipv4, {
2097                     "Engine ID Data: IPv4 address", "snmp.engineid.ipv4", FT_IPv4, BASE_NONE,
2098                     NULL, 0, NULL, HFILL }},
2099                 { &hf_snmp_engineid_ipv6, {
2100                     "Engine ID Data: IPv6 address", "snmp.engineid.ipv6", FT_IPv6, BASE_NONE,
2101                     NULL, 0, NULL, HFILL }},
2102                 { &hf_snmp_engineid_cisco_type, {
2103                     "Engine ID Data: Cisco type", "snmp.engineid.cisco.type", FT_UINT8, BASE_NONE,
2104                     VALS(snmp_engineid_cisco_type_vals), 0, NULL, HFILL }},
2105                 { &hf_snmp_engineid_mac, {
2106                     "Engine ID Data: MAC address", "snmp.engineid.mac", FT_ETHER, BASE_NONE,
2107                     NULL, 0, NULL, HFILL }},
2108                 { &hf_snmp_engineid_text, {
2109                     "Engine ID Data: Text", "snmp.engineid.text", FT_STRING, BASE_NONE,
2110                     NULL, 0, NULL, HFILL }},
2111                 { &hf_snmp_engineid_time, {
2112                     "Engine ID Data: Creation Time", "snmp.engineid.time", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL,
2113                     NULL, 0, NULL, HFILL }},
2114                 { &hf_snmp_engineid_data, {
2115                     "Engine ID Data", "snmp.engineid.data", FT_BYTES, BASE_NONE,
2116                     NULL, 0, NULL, HFILL }},
2117                 { &hf_snmp_msgAuthentication, {
2118                     "Authentication", "snmp.v3.auth", FT_BOOLEAN, BASE_NONE,
2119                     TFS(&auth_flags), 0, NULL, HFILL }},
2120                 { &hf_snmp_decryptedPDU, {
2121                     "Decrypted ScopedPDU", "snmp.decrypted_pdu", FT_BYTES, BASE_NONE,
2122                     NULL, 0, "Decrypted PDU", HFILL }},
2123                 { &hf_snmp_noSuchObject, {
2124                     "noSuchObject", "snmp.noSuchObject", FT_NONE, BASE_NONE,
2125                     NULL, 0, NULL, HFILL }},
2126                 { &hf_snmp_noSuchInstance, {
2127                     "noSuchInstance", "snmp.noSuchInstance", FT_NONE, BASE_NONE,
2128                     NULL, 0, NULL, HFILL }},
2129                 { &hf_snmp_endOfMibView, {
2130                     "endOfMibView", "snmp.endOfMibView", FT_NONE, BASE_NONE,
2131                     NULL, 0, NULL, HFILL }},
2132                 { &hf_snmp_unSpecified, {
2133                     "unSpecified", "snmp.unSpecified", FT_NONE, BASE_NONE,
2134                     NULL, 0, NULL, HFILL }},
2135
2136                 { &hf_snmp_integer32_value, {
2137                     "Value (Integer32)", "snmp.value.int", FT_INT64, BASE_DEC,
2138                     NULL, 0, NULL, HFILL }},
2139                 { &hf_snmp_octetstring_value, {
2140                     "Value (OctetString)", "snmp.value.octets", FT_BYTES, BASE_NONE,
2141                     NULL, 0, NULL, HFILL }},
2142                 { &hf_snmp_oid_value, {
2143                     "Value (OID)", "snmp.value.oid", FT_OID, BASE_NONE,
2144                     NULL, 0, NULL, HFILL }},
2145                 { &hf_snmp_null_value, {
2146                     "Value (Null)", "snmp.value.null", FT_NONE, BASE_NONE,
2147                     NULL, 0, NULL, HFILL }},
2148                 { &hf_snmp_ipv4_value, {
2149                     "Value (IpAddress)", "snmp.value.ipv4", FT_IPv4, BASE_NONE,
2150                     NULL, 0, NULL, HFILL }},
2151                 { &hf_snmp_ipv6_value, {
2152                     "Value (IpAddress)", "snmp.value.ipv6", FT_IPv6, BASE_NONE,
2153                     NULL, 0, NULL, HFILL }},
2154                 { &hf_snmp_anyaddress_value, {
2155                     "Value (IpAddress)", "snmp.value.addr", FT_BYTES, BASE_NONE,
2156                     NULL, 0, NULL, HFILL }},
2157                 { &hf_snmp_unsigned32_value, {
2158                     "Value (Unsigned32)", "snmp.value.u32", FT_INT64, BASE_DEC,
2159                     NULL, 0, NULL, HFILL }},
2160                 { &hf_snmp_gauge32_value, {
2161                     "Value (Gauge32)", "snmp.value.g32", FT_INT64, BASE_DEC,
2162                     NULL, 0, NULL, HFILL }},
2163                 { &hf_snmp_unknown_value, {
2164                     "Value (Unknown)", "snmp.value.unk", FT_BYTES, BASE_NONE,
2165                     NULL, 0, NULL, HFILL }},
2166                 { &hf_snmp_counter_value, {
2167                     "Value (Counter32)", "snmp.value.counter", FT_UINT64, BASE_DEC,
2168                     NULL, 0, NULL, HFILL }},
2169                 { &hf_snmp_big_counter_value, {
2170                     "Value (Counter64)", "snmp.value.counter", FT_UINT64, BASE_DEC,
2171                     NULL, 0, NULL, HFILL }},
2172                 { &hf_snmp_nsap_value, {
2173                     "Value (NSAP)", "snmp.value.nsap", FT_UINT64, BASE_DEC,
2174                     NULL, 0, NULL, HFILL }},
2175                 { &hf_snmp_timeticks_value, {
2176                     "Value (Timeticks)", "snmp.value.timeticks", FT_UINT64, BASE_DEC,
2177                     NULL, 0, NULL, HFILL }},
2178                 { &hf_snmp_opaque_value, {
2179                     "Value (Opaque)", "snmp.value.opaque", FT_BYTES, BASE_NONE,
2180                     NULL, 0, NULL, HFILL }},
2181                 { &hf_snmp_objectname, {
2182                     "Object Name", "snmp.name", FT_OID, BASE_NONE,
2183                     NULL, 0, NULL, HFILL }},
2184                 { &hf_snmp_scalar_instance_index, {
2185                     "Scalar Instance Index", "snmp.name.index", FT_UINT64, BASE_DEC,
2186                     NULL, 0, NULL, HFILL }},
2187
2188
2189 #include "packet-snmp-hfarr.c"
2190   };
2191
2192   /* List of subtrees */
2193   static gint *ett[] = {
2194           &ett_snmp,
2195           &ett_engineid,
2196           &ett_msgFlags,
2197           &ett_encryptedPDU,
2198           &ett_decrypted,
2199           &ett_authParameters,
2200           &ett_internet,
2201           &ett_varbind,
2202           &ett_name,
2203           &ett_value,
2204           &ett_decoding_error,
2205 #include "packet-snmp-ettarr.c"
2206   };
2207   module_t *snmp_module;
2208
2209   static uat_field_t users_fields[] = {
2210           UAT_FLD_BUFFER(snmp_users,engine_id,"Engine ID","Engine-id for this entry (empty = any)"),
2211           UAT_FLD_LSTRING(snmp_users,userName,"Username","The username"),
2212           UAT_FLD_VS(snmp_users,auth_model,"Authentication model",auth_types,"Algorithm to be used for authentication."),
2213           UAT_FLD_LSTRING(snmp_users,authPassword,"Password","The password used for authenticating packets for this entry"),
2214           UAT_FLD_VS(snmp_users,priv_proto,"Privacy protocol",priv_types,"Algorithm to be used for privacy."),
2215           UAT_FLD_LSTRING(snmp_users,privPassword,"Privacy password","The password used for encrypting packets for this entry"),
2216           UAT_END_FIELDS
2217   };
2218
2219   uat_t *assocs_uat = uat_new("SNMP Users",
2220                               sizeof(snmp_ue_assoc_t),
2221                               "snmp_users",
2222                               TRUE,
2223                               (void*)&ueas,
2224                               &num_ueas,
2225                               UAT_CAT_CRYPTO,
2226                               "ChSNMPUsersSection",
2227                               snmp_users_copy_cb,
2228                               snmp_users_update_cb,
2229                               snmp_users_free_cb,
2230                               renew_ue_cache,
2231                               users_fields);
2232
2233   static uat_field_t specific_traps_flds[] = {
2234     UAT_FLD_CSTRING(specific_traps,enterprise,"Enterprise OID","Enterprise Object Identifier"),
2235     UAT_FLD_DEC(specific_traps,trap,"Trap Id","The specific-trap value"),
2236     UAT_FLD_CSTRING(specific_traps,desc,"Description","Trap type description"),
2237     UAT_END_FIELDS
2238   };
2239
2240   uat_t* specific_traps_uat = uat_new("SNMP Enterprise Specific Trap Types",
2241                                       sizeof(snmp_st_assoc_t),
2242                                       "snmp_specific_traps",
2243                                       TRUE,
2244                                       (void*) &specific_traps,
2245                                       &num_specific_traps,
2246                                       UAT_CAT_GENERAL,
2247                                       "ChSNMPEnterpriseSpecificTrapTypes",
2248                                       snmp_specific_trap_copy_cb,
2249                                       NULL,
2250                                       snmp_specific_trap_free_cb,
2251                                                                           NULL,
2252                                       specific_traps_flds);
2253
2254   /* Register protocol */
2255   proto_snmp = proto_register_protocol(PNAME, PSNAME, PFNAME);
2256   new_register_dissector("snmp", dissect_snmp, proto_snmp);
2257
2258   /* Register fields and subtrees */
2259   proto_register_field_array(proto_snmp, hf, array_length(hf));
2260   proto_register_subtree_array(ett, array_length(ett));
2261
2262
2263   /* Register configuration preferences */
2264   snmp_module = prefs_register_protocol(proto_snmp, process_prefs);
2265   prefs_register_bool_preference(snmp_module, "display_oid",
2266                         "Show SNMP OID in info column",
2267                         "Whether the SNMP OID should be shown in the info column",
2268                         &display_oid);
2269
2270   prefs_register_obsolete_preference(snmp_module, "mib_modules");
2271   prefs_register_obsolete_preference(snmp_module, "users_file");
2272
2273   prefs_register_bool_preference(snmp_module, "desegment",
2274                         "Reassemble SNMP-over-TCP messages\nspanning multiple TCP segments",
2275                         "Whether the SNMP dissector should reassemble messages spanning multiple TCP segments."
2276                         " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
2277                         &snmp_desegment);
2278
2279   prefs_register_bool_preference(snmp_module, "var_in_tree",
2280                         "Display dissected variables inside SNMP tree",
2281                         "ON - display dissected variables inside SNMP tree, OFF - display dissected variables in root tree after SNMP",
2282                         &snmp_var_in_tree);
2283
2284   prefs_register_uat_preference(snmp_module, "users_table",
2285                                 "Users Table",
2286                                 "Table of engine-user associations used for authentication and decryption",
2287                                 assocs_uat);
2288
2289   prefs_register_uat_preference(snmp_module, "specific_traps_table",
2290                                 "Enterprise Specific Trap Types",
2291                                 "Table of enterprise specific-trap type descriptions",
2292                                 specific_traps_uat);
2293
2294 #ifdef HAVE_LIBSMI
2295   prefs_register_static_text_preference(snmp_module, "info_mibs",
2296                                         "MIB settings can be changed in the Name Resolution preferences",
2297                                         "MIB settings can be changed in the Name Resolution preferences");
2298 #endif
2299
2300   value_sub_dissectors_table = register_dissector_table("snmp.variable_oid","SNMP Variable OID", FT_STRING, BASE_NONE);
2301
2302   register_init_routine(renew_ue_cache);
2303
2304   register_ber_syntax_dissector("SNMP", proto_snmp, dissect_snmp_tcp);
2305 }
2306
2307
2308 /*--- proto_reg_handoff_snmp ---------------------------------------*/
2309 void proto_reg_handoff_snmp(void) {
2310         dissector_handle_t snmp_tcp_handle;
2311
2312         snmp_handle = find_dissector("snmp");
2313
2314         dissector_add_uint("udp.port", UDP_PORT_SNMP, snmp_handle);
2315         dissector_add_uint("udp.port", UDP_PORT_SNMP_TRAP, snmp_handle);
2316         dissector_add_uint("udp.port", UDP_PORT_SNMP_PATROL, snmp_handle);
2317         dissector_add_uint("ethertype", ETHERTYPE_SNMP, snmp_handle);
2318         dissector_add_uint("ipx.socket", IPX_SOCKET_SNMP_AGENT, snmp_handle);
2319         dissector_add_uint("ipx.socket", IPX_SOCKET_SNMP_SINK, snmp_handle);
2320         dissector_add_uint("hpext.dxsap", HPEXT_SNMP, snmp_handle);
2321
2322         snmp_tcp_handle = create_dissector_handle(dissect_snmp_tcp, proto_snmp);
2323         dissector_add_uint("tcp.port", TCP_PORT_SNMP, snmp_tcp_handle);
2324         dissector_add_uint("tcp.port", TCP_PORT_SNMP_TRAP, snmp_tcp_handle);
2325
2326         data_handle = find_dissector("data");
2327
2328         /*
2329          * Process preference settings.
2330          *
2331          * We can't do this in the register routine, as preferences aren't
2332          * read until all dissector register routines have been called (so
2333          * that all dissector preferences have been registered).
2334          */
2335         process_prefs();
2336
2337 }
2338
2339 void
2340 proto_register_smux(void)
2341 {
2342         static hf_register_info hf[] = {
2343                 { &hf_smux_version,
2344                 { "Version", "smux.version", FT_UINT8, BASE_DEC, NULL,
2345                     0x0, NULL, HFILL }},
2346                 { &hf_smux_pdutype,
2347                 { "PDU type", "smux.pdutype", FT_UINT8, BASE_DEC, VALS(smux_types),
2348                     0x0, NULL, HFILL }},
2349         };
2350         static gint *ett[] = {
2351                 &ett_smux,
2352         };
2353
2354         proto_smux = proto_register_protocol("SNMP Multiplex Protocol",
2355             "SMUX", "smux");
2356         proto_register_field_array(proto_smux, hf, array_length(hf));
2357         proto_register_subtree_array(ett, array_length(ett));
2358
2359 }
2360
2361 void
2362 proto_reg_handoff_smux(void)
2363 {
2364         dissector_handle_t smux_handle;
2365
2366         smux_handle = create_dissector_handle(dissect_smux, proto_smux);
2367         dissector_add_uint("tcp.port", TCP_PORT_SMUX, smux_handle);
2368 }