packet-cops.c

   1 /* packet-cops.c
   2  * Routines for the COPS (Common Open Policy Service) protocol dissection
   3  * RFC2748 & COPS-PR extension RFC3084
   4  *
   5  * Copyright 2000, Heikki Vatiainen <hessu@cs.tut.fi>
   6  *
   7  * $Id: packet-cops.c,v 1.25 2002/03/12 10:40:01 guy Exp $
   8  *
   9  * Ethereal - Network traffic analyzer
  10  * By Gerald Combs <gerald@ethereal.com>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <ctype.h>
  36
  37 #include <glib.h>
  38 #include <epan/packet.h>
  39 #include "packet-ipv6.h"
  40 #include "packet-frame.h"
  41
  42 #include "asn1.h"
  43 #include "format-oid.h"
  44 #include "prefs.h"
  45
  46 #define TCP_PORT_COPS 3288
  47
  48 /* Variable to hold the tcp port preference */
  49 static guint global_cops_tcp_port = TCP_PORT_COPS;
  50
  51 /* desegmentation of COPS */
  52 static gboolean cops_desegment = TRUE;
  53
  54 /* Variable to allow for proper deletion of dissector registration
  55  * when the user changes port from the gui
  56  */
  57
  58 static guint cops_tcp_port = 0;
  59
  60 #define COPS_OBJECT_HDR_SIZE 4
  61
  62 /* Null string of type "guchar[]". */
  63 static const guchar nullstring[] = "";
  64
  65 #define SAFE_STRING(s)  (((s) != NULL) ? (s) : nullstring)
  66
  67 /* COPS PR Tags */
  68
  69 #define COPS_IPA    0           /* IP Address */
  70 #define COPS_U32    2           /* Unsigned 32*/
  71 #define COPS_TIT    3           /* TimeTicks */
  72 #define COPS_OPQ    4           /* Opaque */
  73 #define COPS_I64    10          /* Integer64 */
  74 #define COPS_U64    11          /* Uinteger64 */
  75
  76 /* COPS PR Types */
  77
  78 #define COPS_NULL                0
  79 #define COPS_INTEGER             1    /* l  */
  80 #define COPS_OCTETSTR            2    /* c  */
  81 #define COPS_OBJECTID            3    /* ul */
  82 #define COPS_IPADDR              4    /* uc */
  83 #define COPS_UNSIGNED32          5    /* ul */
  84 #define COPS_TIMETICKS           7    /* ul */
  85 #define COPS_OPAQUE              8    /* c  */
  86 #define COPS_INTEGER64           10   /* ll */
  87 #define COPS_UNSIGNED64          11   /* ull  */
  88
  89
  90 typedef struct _COPS_CNV COPS_CNV;
  91
  92 struct _COPS_CNV
  93 {
  94   guint class;
  95   guint tag;
  96   gint  syntax;
  97   gchar *name;
  98 };
  99
 100 static COPS_CNV CopsCnv [] =
 101 {
 102   {ASN1_UNI, ASN1_NUL, COPS_NULL,      "NULL"},
 103   {ASN1_UNI, ASN1_INT, COPS_INTEGER,   "INTEGER"},
 104   {ASN1_UNI, ASN1_OTS, COPS_OCTETSTR,  "OCTET STRING"},
 105   {ASN1_UNI, ASN1_OJI, COPS_OBJECTID,  "OBJECTID"},
 106   {ASN1_APL, COPS_IPA, COPS_IPADDR,    "IPADDR"},
 107   {ASN1_APL, COPS_U32, COPS_UNSIGNED32,"UNSIGNED32"},
 108   {ASN1_APL, COPS_TIT, COPS_TIMETICKS, "TIMETICKS"},
 109   {ASN1_APL, COPS_OPQ, COPS_OPAQUE,    "OPAQUE"},
 110   {ASN1_APL, COPS_I64, COPS_INTEGER64, "INTEGER64"},
 111   {ASN1_APL, COPS_U64, COPS_UNSIGNED64, "UNSIGNED64"},
 112   {0,       0,         -1,                  NULL}
 113 };
 114
 115 static gchar *
 116 cops_tag_cls2syntax ( guint tag, guint cls, gushort *syntax)
 117 {
 118     COPS_CNV *cnv;
 119
 120     cnv = CopsCnv;
 121     while (cnv->syntax != -1)
 122     {
 123         if (cnv->tag == tag && cnv->class == cls)
 124         {
 125             *syntax = cnv->syntax;
 126             return cnv->name;
 127         }
 128         cnv++;
 129     }
 130     return NULL;
 131 }
 132
 133 static const value_string cops_flags_vals[] = {
 134         { 0x00,          "None" },
 135         { 0x01,          "Solicited Message Flag Bit" },
 136         { 0, NULL },
 137 };
 138
 139 /* The different COPS message types */
 140 enum cops_op_code {
 141         COPS_NO_MSG,          /* Not a COPS Message type     */
 142
 143         COPS_MSG_REQ,         /* Request (REQ)               */
 144         COPS_MSG_DEC,         /* Decision (DEC)              */
 145         COPS_MSG_RPT,         /* Report State (RPT)          */
 146         COPS_MSG_DRQ,         /* Delete Request State (DRQ)  */
 147         COPS_MSG_SSQ,         /* Synchronize State Req (SSQ) */
 148         COPS_MSG_OPN,         /* Client-Open (OPN)           */
 149         COPS_MSG_CAT,         /* Client-Accept (CAT)         */
 150         COPS_MSG_CC,          /* Client-Close (CC)           */
 151         COPS_MSG_KA,          /* Keep-Alive (KA)             */
 152         COPS_MSG_SSC,         /* Synchronize Complete (SSC)  */
 153
 154         COPS_LAST_OP_CODE     /* For error checking          */
 155 };
 156
 157 static const value_string cops_op_code_vals[] = {
 158         { COPS_MSG_REQ,          "Request (REQ)" },
 159         { COPS_MSG_DEC,          "Decision (DEC)" },
 160         { COPS_MSG_RPT,          "Report State (RPT)" },
 161         { COPS_MSG_DRQ,          "Delete Request State (DRQ)" },
 162         { COPS_MSG_SSQ,          "Synchronize State Req (SSQ)" },
 163         { COPS_MSG_OPN,          "Client-Open (OPN)" },
 164         { COPS_MSG_CAT,          "Client-Accept (CAT)" },
 165         { COPS_MSG_CC,           "Client-Close (CC)" },
 166         { COPS_MSG_KA,           "Keep-Alive (KA)" },
 167         { COPS_MSG_SSC,          "Synchronize Complete (SSC)" },
 168         { 0, NULL },
 169 };
 170
 171
 172 /* The different objects in COPS messages */
 173 enum cops_c_num {
 174         COPS_NO_OBJECT,        /* Not a COPS Object type               */
 175
 176         COPS_OBJ_HANDLE,       /* Handle Object (Handle)               */
 177         COPS_OBJ_CONTEXT,      /* Context Object (Context)             */
 178         COPS_OBJ_IN_INT,       /* In-Interface Object (IN-Int)         */
 179         COPS_OBJ_OUT_INT,      /* Out-Interface Object (OUT-Int)       */
 180         COPS_OBJ_REASON,       /* Reason Object (Reason)               */
 181         COPS_OBJ_DECISION,     /* Decision Object (Decision)           */
 182         COPS_OBJ_LPDPDECISION, /* LPDP Decision Object (LPDPDecision)  */
 183         COPS_OBJ_ERROR,        /* Error Object (Error)                 */
 184         COPS_OBJ_CLIENTSI,     /* Client Specific Information Object (ClientSI) */
 185         COPS_OBJ_KATIMER,      /* Keep-Alive Timer Object (KATimer)    */
 186         COPS_OBJ_PEPID,        /* PEP Identification Object (PEPID)    */
 187         COPS_OBJ_REPORT_TYPE,  /* Report-Type Object (Report-Type)     */
 188         COPS_OBJ_PDPREDIRADDR, /* PDP Redirect Address Object (PDPRedirAddr) */
 189         COPS_OBJ_LASTPDPADDR,  /* Last PDP Address (LastPDPaddr)       */
 190         COPS_OBJ_ACCTTIMER,    /* Accounting Timer Object (AcctTimer)  */
 191         COPS_OBJ_INTEGRITY,    /* Message Integrity Object (Integrity) */
 192         COPS_LAST_C_NUM        /* For error checking                   */
 193 };
 194
 195 static const value_string cops_c_num_vals[] = {
 196         { COPS_OBJ_HANDLE,       "Handle Object (Handle)" },
 197         { COPS_OBJ_CONTEXT,      "Context Object (Context)" },
 198         { COPS_OBJ_IN_INT,       "In-Interface Object (IN-Int)" },
 199         { COPS_OBJ_OUT_INT,      "Out-Interface Object (OUT-Int)" },
 200         { COPS_OBJ_REASON,       "Reason Object (Reason)" },
 201         { COPS_OBJ_DECISION,     "Decision Object (Decision)" },
 202         { COPS_OBJ_LPDPDECISION, "LPDP Decision Object (LPDPDecision)" },
 203         { COPS_OBJ_ERROR,        "Error Object (Error)" },
 204         { COPS_OBJ_CLIENTSI,     "Client Specific Information Object (ClientSI)" },
 205         { COPS_OBJ_KATIMER,      "Keep-Alive Timer Object (KATimer)" },
 206         { COPS_OBJ_PEPID,        "PEP Identification Object (PEPID)" },
 207         { COPS_OBJ_REPORT_TYPE,  "Report-Type Object (Report-Type)" },
 208         { COPS_OBJ_PDPREDIRADDR, "PDP Redirect Address Object (PDPRedirAddr)" },
 209         { COPS_OBJ_LASTPDPADDR,  "Last PDP Address (LastPDPaddr)" },
 210         { COPS_OBJ_ACCTTIMER,    "Accounting Timer Object (AcctTimer)" },
 211         { COPS_OBJ_INTEGRITY,    "Message Integrity Object (Integrity)" },
 212         { 0, NULL },
 213 };
 214
 215
 216 /* The different objects in COPS-PR messages */
 217 enum cops_s_num {
 218         COPS_NO_PR_OBJECT,     /* Not a COPS-PR Object type               */
 219         COPS_OBJ_PRID,         /* Provisioning Instance Identifier (PRID) */
 220         COPS_OBJ_PPRID,        /* Prefix Provisioning Instance Identifier (PPRID) */
 221         COPS_OBJ_EPD,          /* Encoded Provisioning Instance Data (EPD) */
 222         COPS_OBJ_GPERR,        /* Global Provisioning Error Object (GPERR) */
 223         COPS_OBJ_CPERR,        /* PRC Class Provisioning Error Object (CPERR) */
 224         COPS_OBJ_ERRPRID,      /* Error Provisioning Instance Identifier (ErrorPRID)*/
 225
 226         COPS_LAST_S_NUM        /* For error checking                   */
 227 };
 228
 229
 230 static const value_string cops_s_num_vals[] = {
 231         { COPS_OBJ_PRID,         "Provisioning Instance Identifier (PRID)" },
 232         { COPS_OBJ_PPRID,        "Prefix Provisioning Instance Identifier (PPRID)" },
 233         { COPS_OBJ_EPD,          "Encoded Provisioning Instance Data (EPD)" },
 234         { COPS_OBJ_GPERR,        "Global Provisioning Error Object (GPERR)" },
 235         { COPS_OBJ_CPERR,        "PRC Class Provisioning Error Object (CPERR)" },
 236         { COPS_OBJ_ERRPRID,      "Error Provisioning Instance Identifier (ErrorPRID)" },
 237         { 0, NULL },
 238
 239 };
 240
 241 /* R-Type is carried within the Context Object */
 242 static const value_string cops_r_type_vals[] = {
 243         { 0x01, "Incoming-Message/Admission Control request" },
 244         { 0x02, "Resource-Allocation request" },
 245         { 0x04, "Outgoing-Message request" },
 246         { 0x08, "Configuration request" },
 247         { 0, NULL },
 248 };
 249 /* S-Type is carried within the ClientSI Object for COPS-PR*/
 250 static const value_string cops_s_type_vals[] = {
 251         { 0x01, "BER" },
 252         { 0, NULL },
 253 };
 254
 255 /* Reason-Code is carried within the Reason object */
 256 static const value_string cops_reason_vals[] = {
 257         { 1,  "Unspecified" },
 258         { 2,  "Management" },
 259         { 3,  "Preempted (Another request state takes precedence)" },
 260         { 4,  "Tear (Used to communicate a signaled state removal)" },
 261         { 5,  "Timeout (Local state has timed-out)" },
 262         { 6,  "Route Change (Change invalidates request state)" },
 263         { 7,  "Insufficient Resources (No local resource available)" },
 264         { 8,  "PDP's Directive (PDP decision caused the delete)" },
 265         { 9,  "Unsupported decision (PDP decision not supported)" },
 266         { 10, "Synchronize Handle Unknown" },
 267         { 11, "Transient Handle (stateless event)" },
 268         { 12, "Malformed Decision (could not recover)" },
 269         { 13, "Unknown COPS Object from PDP" },
 270         { 0, NULL },
 271 };
 272
 273 /* Command-Code is carried within the Decision object if C-Type is 1 */
 274 static const value_string cops_dec_cmd_code_vals[] = {
 275         { 0, "NULL Decision (No configuration data available)" },
 276         { 1, "Install (Admit request/Install configuration)" },
 277         { 2, "Remove (Remove request/Remove configuration)" },
 278         { 0, NULL },
 279 };
 280
 281 /* Decision flags are also carried with the Decision object if C-Type is 1 */
 282 static const value_string cops_dec_cmd_flag_vals[] = {
 283         { 0x00, "<None set>" },
 284         { 0x01, "Trigger Error (Trigger error message if set)" },
 285         { 0, NULL },
 286 };
 287
 288 /* Error-Code from Error object */
 289 static const value_string cops_error_vals[] = {
 290         {1,  "Bad handle" },
 291         {2,  "Invalid handle reference" },
 292         {3,  "Bad message format (Malformed Message)" },
 293         {4,  "Unable to process (server gives up on query)" },
 294         {5,  "Mandatory client-specific info missing" },
 295         {6,  "Unsupported client" },
 296         {7,  "Mandatory COPS object missing" },
 297         {8,  "Client Failure" },
 298         {9,  "Communication Failure" },
 299         {10, "Unspecified" },
 300         {11, "Shutting down" },
 301         {12, "Redirect to Preferred Server" },
 302         {13, "Unknown COPS Object" },
 303         {14, "Authentication Failure" },
 304         {15, "Authentication Required" },
 305         {0,  NULL },
 306 };
 307 /* Error-Code from GPERR object */
 308 static const value_string cops_gperror_vals[] = {
 309         {1,  "AvailMemLow" },
 310         {2,  "AvailMemExhausted" },
 311         {3,  "unknownASN.1Tag" },
 312         {4,  "maxMsgSizeExceeded" },
 313         {5,  "unknownError" },
 314         {6,  "maxRequestStatesOpen" },
 315         {7,  "invalidASN.1Length" },
 316         {8,  "invalidObjectPad" },
 317         {9,  "unknownPIBData" },
 318         {10, "unknownCOPSPRObject" },
 319         {11, "malformedDecision" },
 320         {0,  NULL },
 321 };
 322
 323 /* Error-Code from CPERR object */
 324 static const value_string cops_cperror_vals[] = {
 325         {1,  "priSpaceExhausted" },
 326         {2,  "priInstanceInvalid" },
 327         {3,  "attrValueInvalid" },
 328         {4,  "attrValueSupLimited" },
 329         {5,  "attrEnumSupLimited" },
 330         {6,  "attrMaxLengthExceeded" },
 331         {7,  "attrReferenceUnknown" },
 332         {8,  "priNotifyOnly" },
 333         {9,  "unknownPrc" },
 334         {10, "tooFewAttrs" },
 335         {11, "invalidAttrType" },
 336         {12, "deletedInRef" },
 337         {13, "priSpecificError" },
 338         {0,  NULL },
 339 };
 340
 341
 342 /* Report-Type from Report-Type object */
 343 static const value_string cops_report_type_vals[] = {
 344         {1, " Success   : Decision was successful at the PEP" },
 345         {2, " Failure   : Decision could not be completed by PEP" },
 346         {3, " Accounting: Accounting update for an installed state" },
 347         {0, NULL },
 348 };
 349
 350 /* Initialize the protocol and registered fields */
 351 static gint proto_cops = -1;
 352 static gint hf_cops_ver_flags = -1;
 353 static gint hf_cops_version = -1;
 354 static gint hf_cops_flags = -1;
 355
 356 static gint hf_cops_op_code = -1;
 357 static gint hf_cops_client_type = -1;
 358 static gint hf_cops_msg_len = -1;
 359
 360 static gint hf_cops_obj_len = -1;
 361 static gint hf_cops_obj_c_num = -1;
 362 static gint hf_cops_obj_c_type = -1;
 363
 364 static gint hf_cops_obj_s_num = -1;
 365 static gint hf_cops_obj_s_type = -1;
 366
 367 static gint hf_cops_r_type_flags = -1;
 368 static gint hf_cops_m_type_flags = -1;
 369
 370 static gint hf_cops_in_int_ipv4 = -1;
 371 static gint hf_cops_in_int_ipv6 = -1;
 372 static gint hf_cops_out_int_ipv4 = -1;
 373 static gint hf_cops_out_int_ipv6 = -1;
 374 static gint hf_cops_int_ifindex = -1;
 375
 376 static gint hf_cops_reason = -1;
 377 static gint hf_cops_reason_sub = -1;
 378
 379 static gint hf_cops_dec_cmd_code = -1;
 380 static gint hf_cops_dec_flags = -1;
 381
 382 static gint hf_cops_error = -1;
 383 static gint hf_cops_error_sub = -1;
 384
 385 static gint hf_cops_gperror = -1;
 386 static gint hf_cops_gperror_sub = -1;
 387
 388 static gint hf_cops_cperror = -1;
 389 static gint hf_cops_cperror_sub = -1;
 390
 391 static gint hf_cops_katimer = -1;
 392
 393 static gint hf_cops_pepid = -1;
 394
 395 static gint hf_cops_report_type = -1;
 396
 397 static gint hf_cops_pdprediraddr_ipv4 = -1;
 398 static gint hf_cops_pdprediraddr_ipv6 = -1;
 399 static gint hf_cops_lastpdpaddr_ipv4 = -1;
 400 static gint hf_cops_lastpdpaddr_ipv6 = -1;
 401 static gint hf_cops_pdp_tcp_port = -1;
 402
 403 static gint hf_cops_accttimer = -1;
 404
 405 static gint hf_cops_key_id = -1;
 406 static gint hf_cops_seq_num = -1;
 407
 408 /* Initialize the subtree pointers */
 409 static gint ett_cops = -1;
 410 static gint ett_cops_ver_flags = -1;
 411 static gint ett_cops_obj = -1;
 412 static gint ett_cops_pr_obj = -1;
 413 static gint ett_cops_obj_data = -1;
 414 static gint ett_cops_r_type_flags = -1;
 415 static gint ett_cops_itf = -1;
 416 static gint ett_cops_reason = -1;
 417 static gint ett_cops_decision = -1;
 418 static gint ett_cops_error = -1;
 419 static gint ett_cops_gperror = -1;
 420 static gint ett_cops_cperror = -1;
 421 static gint ett_cops_pdp = -1;
 422
 423 void proto_reg_handoff_cops(void);
 424
 425 static void dissect_cops_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
 426
 427 static int dissect_cops_object(tvbuff_t *tvb, guint32 offset, proto_tree *tree);
 428 static int dissect_cops_object_data(tvbuff_t *tvb, guint32 offset, proto_tree *tree,
 429                                     guint8 c_num, guint8 c_type, guint16 len);
 430
 431 static int dissect_cops_pr_objects(tvbuff_t *tvb, guint32 offset, proto_tree *tree, guint16 pr_len);
 432 static int dissect_cops_pr_object_data(tvbuff_t *tvb, guint32 offset, proto_tree *tree,
 433                                        guint8 s_num, guint8 s_type, guint16 len);
 434
 435 /* Code to actually dissect the packets */
 436 static void
 437 dissect_cops(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 438 {
 439         volatile int offset = 0;
 440         int length_remaining;
 441         guint32 msg_len;
 442         int length;
 443         tvbuff_t *next_tvb;
 444
 445         while (tvb_reported_length_remaining(tvb, offset) != 0) {
 446                 length_remaining = tvb_length_remaining(tvb, offset);
 447                 if (length_remaining == -1)
 448                         THROW(BoundsError);
 449
 450                 /*
 451                  * Can we do reassembly?
 452                  */
 453                 if (cops_desegment && pinfo->can_desegment) {
 454                         /*
 455                          * Yes - is the COPS header split across segment
 456                          * boundaries?
 457                          */
 458                         if (length_remaining < 8) {
 459                                 /*
 460                                  * Yes.  Tell the TCP dissector where
 461                                  * the data for this message starts in
 462                                  * the data it handed us, and how many
 463                                  * more bytes we need, and return.
 464                                  */
 465                                 pinfo->desegment_offset = offset;
 466                                 pinfo->desegment_len = 8 - length_remaining;
 467                                 return;
 468                         }
 469                 }
 470
 471                 /*
 472                  * Get the length of the COPS message.
 473                  */
 474                 msg_len = tvb_get_ntohl(tvb, offset + 4);
 475
 476                 /*
 477                  * Can we do reassembly?
 478                  */
 479                 if (cops_desegment && pinfo->can_desegment) {
 480                         /*
 481                          * Yes - is the DNS packet split across segment
 482                          * boundaries?
 483                          */
 484                         if ((guint32)length_remaining < msg_len) {
 485                                 /*
 486                                  * Yes.  Tell the TCP dissector where
 487                                  * the data for this message starts in
 488                                  * the data it handed us, and how many
 489                                  * more bytes we need, and return.
 490                                  */
 491                                 pinfo->desegment_offset = offset;
 492                                 pinfo->desegment_len =
 493                                     msg_len - length_remaining;
 494                                 return;
 495                         }
 496                 }
 497
 498                 /*
 499                  * Construct a tvbuff containing the amount of the payload
 500                  * we have available.  Make its reported length the
 501                  * amount of data in the COPS packet.
 502                  *
 503                  * XXX - if reassembly isn't enabled. the subdissector
 504                  * will throw a BoundsError exception, rather than a
 505                  * ReportedBoundsError exception.  We really want
 506                  * a tvbuff where the length is "length", the reported
 507                  * length is "plen + 2", and the "if the snapshot length
 508                  * were infinite" length were the minimum of the
 509                  * reported length of the tvbuff handed to us and "plen+2",
 510                  * with a new type of exception thrown if the offset is
 511                  * within the reported length but beyond that third length,
 512                  * with that exception getting the "Unreassembled Packet"
 513                  * error.
 514                  */
 515                 length = length_remaining;
 516                 if ((guint32)length > msg_len)
 517                         length = msg_len;
 518                 next_tvb = tvb_new_subset(tvb, offset, length, msg_len);
 519
 520                 /*
 521                  * Dissect the COPS packet.
 522                  *
 523                  * Catch the ReportedBoundsError exception; if this
 524                  * particular message happens to get a ReportedBoundsError
 525                  * exception, that doesn't mean that we should stop
 526                  * dissecting COPS messages within this frame or chunk
 527                  * of reassembled data.
 528                  *
 529                  * If it gets a BoundsError, we can stop, as there's nothing
 530                  * more to see, so we just re-throw it.
 531                  */
 532                 TRY {
 533                         dissect_cops_pdu(next_tvb, pinfo, tree);
 534                 }
 535                 CATCH(BoundsError) {
 536                         RETHROW;
 537                 }
 538                 CATCH(ReportedBoundsError) {
 539                         show_reported_bounds_error(tvb, pinfo, tree);
 540                 }
 541                 ENDTRY;
 542
 543                 /*
 544                  * Skip the COPS packet.
 545                  */
 546                 offset += msg_len;
 547         }
 548 }
 549
 550 static void
 551 dissect_cops_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 552 {
 553         guint8 op_code;
 554
 555         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 556                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "COPS");
 557         if (check_col(pinfo->cinfo, COL_INFO))
 558                 col_clear(pinfo->cinfo, COL_INFO);
 559
 560         op_code = tvb_get_guint8(tvb, 1);
 561         if (check_col(pinfo->cinfo, COL_INFO))
 562                 col_add_fstr(pinfo->cinfo, COL_INFO, "COPS %s",
 563                              val_to_str(op_code, cops_op_code_vals, "Unknown Op Code"));
 564
 565         if (tree) {
 566                 proto_item *ti, *tv;
 567                 proto_tree *cops_tree, *ver_flags_tree;
 568                 guint32 msg_len;
 569                 guint32 offset = 0;
 570                 guint8 ver_flags;
 571                 gint garbage;
 572
 573                 ti = proto_tree_add_item(tree, proto_cops, tvb, offset, -1, FALSE);
 574                 cops_tree = proto_item_add_subtree(ti, ett_cops);
 575
 576                 /* Version and flags share the same byte, put them in a subtree */
 577                 ver_flags = tvb_get_guint8(tvb, offset);
 578                 tv = proto_tree_add_uint_format(cops_tree, hf_cops_ver_flags, tvb, offset, 1,
 579                                                   ver_flags, "Version: %u, Flags: %s",
 580                                                   hi_nibble(ver_flags),
 581                                                   val_to_str(lo_nibble(ver_flags), cops_flags_vals, "Unknown"));
 582                 ver_flags_tree = proto_item_add_subtree(tv, ett_cops_ver_flags);
 583                 proto_tree_add_uint(ver_flags_tree, hf_cops_version, tvb, offset, 1, ver_flags);
 584                 proto_tree_add_uint(ver_flags_tree, hf_cops_flags, tvb, offset, 1, ver_flags);
 585                 offset++;
 586
 587                 proto_tree_add_uint(cops_tree, hf_cops_op_code, tvb, offset, 1, tvb_get_guint8(tvb, offset));
 588                 offset ++;
 589                 proto_tree_add_uint(cops_tree, hf_cops_client_type, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
 590                 offset += 2;
 591
 592                 msg_len = tvb_get_ntohl(tvb, offset);
 593                 proto_tree_add_uint(cops_tree, hf_cops_msg_len, tvb, offset, 4, tvb_get_ntohl(tvb, offset));
 594                 offset += 4;
 595
 596                 while (tvb_reported_length_remaining(tvb, offset) >= COPS_OBJECT_HDR_SIZE)
 597                         offset += dissect_cops_object(tvb, offset, cops_tree);
 598
 599                 garbage = tvb_length_remaining(tvb, offset);
 600                 if (garbage > 0)
 601                         proto_tree_add_text(cops_tree, tvb, offset, garbage,
 602                                             "Trailing garbage: %d byte%s", garbage,
 603                                             plurality(garbage, "", "s"));
 604         }
 605
 606         return;
 607 }
 608
 609 static char *cops_c_type_to_str(guint8 c_num, guint8 c_type)
 610 {
 611         switch (c_num) {
 612         case COPS_OBJ_HANDLE:
 613                 if (c_type == 1)
 614                         return "Client Handle";
 615                 break;
 616         case COPS_OBJ_IN_INT:
 617         case COPS_OBJ_OUT_INT:
 618                 if (c_type == 1)
 619                         return "IPv4 Address + Interface";
 620                 else if (c_type == 2)
 621                         return "IPv6 Address + Interface";
 622                 break;
 623         case COPS_OBJ_DECISION:
 624         case COPS_OBJ_LPDPDECISION:
 625                 if (c_type == 1)
 626                         return "Decision Flags (Mandatory)";
 627                 else if (c_type == 2)
 628                         return "Stateless Data";
 629                 else if (c_type == 3)
 630                         return "Replacement Data";
 631                 else if (c_type == 4)
 632                         return "Client Specific Decision Data";
 633                 else if (c_type == 5)
 634                         return "Named Decision Data";
 635                 break;
 636         case COPS_OBJ_CLIENTSI:
 637                 if (c_type == 1)
 638                         return "Signaled ClientSI";
 639                 else if (c_type == 2)
 640                         return "Named ClientSI";
 641                 break;
 642         case COPS_OBJ_KATIMER:
 643                 if (c_type == 1)
 644                         return "Keep-alive timer value";
 645                 break;
 646         case COPS_OBJ_PDPREDIRADDR:
 647         case COPS_OBJ_LASTPDPADDR:
 648                 if (c_type == 1)
 649                         return "IPv4 Address + TCP Port";
 650                 else if (c_type == 2)
 651                         return "IPv6 Address + TCP Port";
 652                 break;
 653         case COPS_OBJ_ACCTTIMER:
 654                 if (c_type == 1)
 655                         return "Accounting timer value";
 656                 break;
 657         case COPS_OBJ_INTEGRITY:
 658                 if (c_type == 1)
 659                         return "HMAC digest";
 660                 break;
 661         }
 662
 663         return "";
 664 }
 665
 666 static int dissect_cops_object(tvbuff_t *tvb, guint32 offset, proto_tree *tree)
 667 {
 668         guint16 object_len, contents_len;
 669         guint8 c_num, c_type;
 670         proto_item *ti;
 671         proto_tree *obj_tree;
 672         char *type_str;
 673         int ret;
 674
 675         object_len = tvb_get_ntohs(tvb, offset);
 676         c_num = tvb_get_guint8(tvb, offset + 2);
 677         c_type = tvb_get_guint8(tvb, offset + 3);
 678
 679         ti = proto_tree_add_uint_format(tree, hf_cops_obj_c_num, tvb, offset, object_len, c_num,
 680                                         "%s: %s", val_to_str(c_num, cops_c_num_vals, "Unknown"),
 681                                         cops_c_type_to_str(c_num, c_type));
 682         obj_tree = proto_item_add_subtree(ti, ett_cops_obj);
 683
 684         proto_tree_add_uint(obj_tree, hf_cops_obj_len, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
 685         offset += 2;
 686
 687         proto_tree_add_uint(obj_tree, hf_cops_obj_c_num, tvb, offset, 1, c_num);
 688         offset++;
 689
 690         type_str = cops_c_type_to_str(c_num, c_type);
 691         proto_tree_add_text(obj_tree, tvb, offset, 1, "C-Type: %s%s%u%s",
 692                             type_str,
 693                             strlen(type_str) ? " (" : "",
 694                             c_type,
 695                             strlen(type_str) ? ")" : "");
 696         offset++;
 697
 698         contents_len = object_len - COPS_OBJECT_HDR_SIZE;
 699         ret = dissect_cops_object_data(tvb, offset, obj_tree, c_num, c_type, contents_len);
 700         if (ret < 0) return 0;
 701
 702         /* Pad to 32bit boundary */
 703         if (object_len % sizeof (guint32))
 704                 object_len += (sizeof (guint32) - object_len % sizeof (guint32));
 705
 706         return object_len;
 707 }
 708
 709 static int dissect_cops_pr_objects(tvbuff_t *tvb, guint32 offset, proto_tree *tree, guint16 pr_len)
 710 {
 711         guint16 object_len, contents_len;
 712         guint8 s_num, s_type;
 713         char *type_str;
 714         int ret;
 715         proto_tree *cops_pr_tree, *obj_tree;
 716         proto_item *ti;
 717
 718         cops_pr_tree = proto_item_add_subtree(tree, ett_cops_pr_obj);
 719
 720         while (pr_len >= COPS_OBJECT_HDR_SIZE) {
 721                 object_len = tvb_get_ntohs(tvb, offset);
 722                 s_num = tvb_get_guint8(tvb, offset + 2);
 723                 s_type = tvb_get_guint8(tvb, offset + 3);
 724
 725                 ti = proto_tree_add_uint_format(cops_pr_tree, hf_cops_obj_s_num, tvb, offset, object_len, s_num,
 726                                         "%s", val_to_str(s_num, cops_s_num_vals, "Unknown"));
 727                 obj_tree = proto_item_add_subtree(cops_pr_tree, ett_cops_pr_obj);
 728
 729                 proto_tree_add_uint(obj_tree, hf_cops_obj_len, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
 730                 offset += 2;
 731                 pr_len -= 2;
 732
 733                 proto_tree_add_uint(obj_tree, hf_cops_obj_s_num, tvb, offset, 1, s_num);
 734                 offset++;
 735                 pr_len--;
 736
 737                 type_str = val_to_str(s_type, cops_s_type_vals, "Unknown");
 738                 proto_tree_add_text(obj_tree, tvb, offset, 1, "S-Type: %s%s%u%s",
 739                             type_str,
 740                             strlen(type_str) ? " (" : "",
 741                             s_type,
 742                             strlen(type_str) ? ")" : "");
 743                 offset++;
 744                 pr_len--;
 745
 746                 contents_len = object_len - COPS_OBJECT_HDR_SIZE;
 747                 ret = dissect_cops_pr_object_data(tvb, offset, obj_tree, s_num, s_type, contents_len);
 748                 if (ret < 0)
 749                         break;
 750
 751                 /*Pad to 32bit boundary */
 752                 if (object_len % sizeof (guint32))
 753                         object_len += (sizeof (guint32) - object_len % sizeof (guint32));
 754
 755                 pr_len -= object_len - COPS_OBJECT_HDR_SIZE;
 756                 offset += object_len - COPS_OBJECT_HDR_SIZE;
 757         }
 758
 759         return 0;
 760 }
 761
 762 static int dissect_cops_object_data(tvbuff_t *tvb, guint32 offset, proto_tree *tree,
 763                                     guint8 c_num, guint8 c_type, guint16 len)
 764 {
 765         proto_item *ti;
 766         proto_tree *r_type_tree, *itf_tree, *reason_tree, *dec_tree, *error_tree, *pdp_tree;
 767         guint16 r_type, m_type, reason, reason_sub, cmd_code, cmd_flags, error, error_sub, tcp_port;
 768         guint32 ipv4addr, ifindex;
 769         struct e_in6_addr ipv6addr;
 770
 771         switch (c_num) {
 772         case COPS_OBJ_CONTEXT:
 773                 r_type = tvb_get_ntohs(tvb, offset);
 774                 m_type = tvb_get_ntohs(tvb, offset + 2);
 775                 ti = proto_tree_add_text(tree, tvb, offset, 4, "Contents: R-Type: %s, M-Type: %u",
 776                                          val_to_str(r_type, cops_r_type_vals, "Unknown"),
 777                                          m_type);
 778
 779                 r_type_tree = proto_item_add_subtree(ti, ett_cops_r_type_flags);
 780                 proto_tree_add_uint(r_type_tree, hf_cops_r_type_flags, tvb, offset, 2, r_type);
 781                 offset += 2;
 782                 proto_tree_add_uint(r_type_tree, hf_cops_m_type_flags, tvb, offset, 2, m_type);
 783
 784                 return 0;
 785                 break;
 786         case COPS_OBJ_IN_INT:
 787         case COPS_OBJ_OUT_INT:
 788                 if (c_type == 1) {          /* IPv4 */
 789                         tvb_memcpy(tvb, (guint8 *)&ipv4addr, offset, 4);
 790                         ifindex = tvb_get_ntohl(tvb, offset + 4);
 791                         ti = proto_tree_add_text(tree, tvb, offset, 8, "Contents: IPv4 address %s, ifIndex: %u",
 792                                                  ip_to_str((guint8 *)&ipv4addr), ifindex);
 793                         itf_tree = proto_item_add_subtree(ti, ett_cops_itf);
 794                         proto_tree_add_ipv4(itf_tree,
 795                                             (c_num == COPS_OBJ_IN_INT) ? hf_cops_in_int_ipv4 : hf_cops_out_int_ipv4,
 796                                             tvb, offset, 4, ipv4addr);
 797                         offset += 4;
 798                 } else if (c_type == 2) {   /* IPv6 */
 799                         tvb_memcpy(tvb, (guint8 *)&ipv6addr, offset, sizeof ipv6addr);
 800                         ifindex = tvb_get_ntohl(tvb, offset + sizeof ipv6addr);
 801                         ti = proto_tree_add_text(tree, tvb, offset, 20, "Contents: IPv6 address %s, ifIndex: %u",
 802                                                  ip6_to_str(&ipv6addr), ifindex);
 803                         itf_tree = proto_item_add_subtree(ti, ett_cops_itf);
 804                         proto_tree_add_ipv6(itf_tree,
 805                                             (c_num == COPS_OBJ_IN_INT) ? hf_cops_in_int_ipv6 : hf_cops_out_int_ipv6,
 806                                             tvb, offset, 16, (guint8 *)&ipv6addr);
 807                         offset += 16;
 808                 } else {
 809                         break;
 810                 }
 811                 proto_tree_add_uint(itf_tree, hf_cops_int_ifindex, tvb, offset, 4, ifindex);
 812
 813                 return 0;
 814                 break;
 815         case COPS_OBJ_REASON:
 816                 reason = tvb_get_ntohs(tvb, offset);
 817                 reason_sub = tvb_get_ntohs(tvb, offset + 2);
 818                 ti = proto_tree_add_text(tree, tvb, offset, 4, "Contents: Reason-Code: %s, Reason Sub-code: 0x%04x",
 819                                          val_to_str(reason, cops_reason_vals, "<Unknown value>"), reason_sub);
 820                 reason_tree = proto_item_add_subtree(ti, ett_cops_reason);
 821                 proto_tree_add_uint(reason_tree, hf_cops_reason, tvb, offset, 2, reason);
 822                 offset += 2;
 823                 if (reason == 13) {
 824                         proto_tree_add_text(reason_tree, tvb, offset, 2, "Reason Sub-code: "
 825                                             "Unknown object's C-Num %u, C-Type %u",
 826                                             tvb_get_guint8(tvb, offset), tvb_get_guint8(tvb, offset + 1));
 827                 } else
 828                         proto_tree_add_uint(reason_tree, hf_cops_reason_sub, tvb, offset, 2, reason_sub);
 829
 830                 return 0;
 831                 break;
 832         case COPS_OBJ_DECISION:
 833         case COPS_OBJ_LPDPDECISION:
 834                 if (c_type == 1) {
 835                         cmd_code = tvb_get_ntohs(tvb, offset);
 836                         cmd_flags = tvb_get_ntohs(tvb, offset + 2);
 837                         ti = proto_tree_add_text(tree, tvb, offset, 4, "Contents: Command-Code: %s, Flags: %s",
 838                                          val_to_str(cmd_code, cops_dec_cmd_code_vals, "<Unknown value>"),
 839                                          val_to_str(cmd_flags, cops_dec_cmd_flag_vals, "<Unknown flag>"));
 840                         dec_tree = proto_item_add_subtree(ti, ett_cops_decision);
 841                         proto_tree_add_uint(dec_tree, hf_cops_dec_cmd_code, tvb, offset, 2, cmd_code);
 842                         offset += 2;
 843                         proto_tree_add_uint(dec_tree, hf_cops_dec_flags, tvb, offset, 2, cmd_flags);
 844                 } else if (c_type == 5) { /*COPS-PR Data*/
 845                         ti = proto_tree_add_text(tree, tvb, offset, 4, "Contents: %u bytes", len);
 846                         dissect_cops_pr_objects(tvb, offset, ti, len);
 847                 } else
 848                         break;
 849
 850                 return 0;
 851                 break;
 852         case COPS_OBJ_ERROR:
 853                 if (c_type != 1)
 854                         break;
 855
 856                 error = tvb_get_ntohs(tvb, offset);
 857                 error_sub = tvb_get_ntohs(tvb, offset + 2);
 858                 ti = proto_tree_add_text(tree, tvb, offset, 4, "Contents: Error-Code: %s, Error Sub-code: 0x%04x",
 859                                          val_to_str(error, cops_error_vals, "<Unknown value>"), error_sub);
 860                 error_tree = proto_item_add_subtree(ti, ett_cops_error);
 861                 proto_tree_add_uint(error_tree, hf_cops_error, tvb, offset, 2, error);
 862                 offset += 2;
 863                 if (error == 13) {
 864                         proto_tree_add_text(error_tree, tvb, offset, 2, "Error Sub-code: "
 865                                             "Unknown object's C-Num %u, C-Type %u",
 866                                             tvb_get_guint8(tvb, offset), tvb_get_guint8(tvb, offset + 1));
 867                 } else
 868                         proto_tree_add_uint(error_tree, hf_cops_error_sub, tvb, offset, 2, error_sub);
 869
 870                 return 0;
 871                 break;
 872         case COPS_OBJ_CLIENTSI:
 873
 874                 if (c_type != 2) /*Not COPS-PR data*/
 875                       break;
 876
 877                 ti = proto_tree_add_text(tree, tvb, offset, 4, "Contents: %u bytes", len);
 878
 879                 dissect_cops_pr_objects(tvb, offset, ti, len);
 880
 881                 return 0;
 882                 break;
 883         case COPS_OBJ_KATIMER:
 884                 if (c_type != 1)
 885                         break;
 886
 887                 proto_tree_add_item(tree, hf_cops_katimer, tvb, offset + 2, 2, FALSE);
 888                 if (tvb_get_ntohs(tvb, offset + 2) == 0)
 889                         proto_tree_add_text(tree, tvb, offset, 0, "Value of zero implies infinity.");
 890
 891                 return 0;
 892                 break;
 893         case COPS_OBJ_PEPID:
 894                 if (c_type != 1)
 895                         break;
 896
 897                 if (tvb_strnlen(tvb, offset, len) == -1)
 898                         proto_tree_add_text(tree, tvb, offset, len, "<PEP Id is not a NUL terminated ASCII string>");
 899                 else
 900                         proto_tree_add_item(tree, hf_cops_pepid, tvb, offset,
 901                                             tvb_strnlen(tvb, offset, len) + 1, FALSE);
 902
 903                 return 0;
 904                 break;
 905         case COPS_OBJ_REPORT_TYPE:
 906                 if (c_type != 1)
 907                         break;
 908
 909                 proto_tree_add_item(tree, hf_cops_report_type, tvb, offset, 2, FALSE);
 910
 911                 return 0;
 912                 break;
 913         case COPS_OBJ_PDPREDIRADDR:
 914         case COPS_OBJ_LASTPDPADDR:
 915                 if (c_type == 1) {          /* IPv4 */
 916                         tvb_memcpy(tvb, (guint8 *)&ipv4addr, offset, 4);
 917                         tcp_port = tvb_get_ntohs(tvb, offset + 4 + 2);
 918                         ti = proto_tree_add_text(tree, tvb, offset, 8, "Contents: IPv4 address %s, TCP Port Number: %u",
 919                                                  ip_to_str((guint8 *)&ipv4addr), tcp_port);
 920                         pdp_tree = proto_item_add_subtree(ti, ett_cops_pdp);
 921                         proto_tree_add_ipv4(pdp_tree,
 922                                             (c_num == COPS_OBJ_PDPREDIRADDR) ? hf_cops_pdprediraddr_ipv4 : hf_cops_lastpdpaddr_ipv4,
 923                                             tvb, offset, 4, ipv4addr);
 924                         offset += 4;
 925                 } else if (c_type == 2) {   /* IPv6 */
 926                         tvb_memcpy(tvb, (guint8 *)&ipv6addr, offset, sizeof ipv6addr);
 927                         tcp_port = tvb_get_ntohs(tvb, offset + sizeof ipv6addr + 2);
 928                         ti = proto_tree_add_text(tree, tvb, offset, 20, "Contents: IPv6 address %s, TCP Port Number: %u",
 929                                                  ip6_to_str(&ipv6addr), tcp_port);
 930                         pdp_tree = proto_item_add_subtree(ti, ett_cops_pdp);
 931                         proto_tree_add_ipv6(pdp_tree,
 932                                             (c_num == COPS_OBJ_PDPREDIRADDR) ? hf_cops_pdprediraddr_ipv6 : hf_cops_lastpdpaddr_ipv6,
 933                                             tvb, offset, 16, (guint8 *)&ipv6addr);
 934                         offset += 16;
 935                 } else {
 936                         break;
 937                 }
 938                 offset += 2;
 939                 proto_tree_add_uint(pdp_tree, hf_cops_pdp_tcp_port, tvb, offset, 2, tcp_port);
 940
 941                 return 0;
 942                 break;
 943         case COPS_OBJ_ACCTTIMER:
 944                 if (c_type != 1)
 945                         break;
 946
 947                 proto_tree_add_item(tree, hf_cops_accttimer, tvb, offset + 2, 2, FALSE);
 948                 if (tvb_get_ntohs(tvb, offset + 2) == 0)
 949                         proto_tree_add_text(tree, tvb, offset, 0, "Value of zero means "
 950                                             "there SHOULD be no unsolicited accounting updates.");
 951
 952                 return 0;
 953                 break;
 954         case COPS_OBJ_INTEGRITY:
 955                 if (c_type != 1)
 956                         break;      /* Not HMAC digest */
 957
 958                 proto_tree_add_item(tree, hf_cops_key_id, tvb, offset, 4, FALSE);
 959                 proto_tree_add_item(tree, hf_cops_seq_num, tvb, offset + 4, 4, FALSE);
 960                 proto_tree_add_text(tree, tvb, offset + 8 , len - 8, "Contents: Keyed Message Digest");
 961
 962                 return 0;
 963                 break;
 964
 965         default:
 966                 break;
 967         }
 968
 969         ti = proto_tree_add_text(tree, tvb, offset, len, "Contents: %u bytes", len);
 970
 971         return 0;
 972 }
 973
 974 static int decode_cops_pr_asn1_data(tvbuff_t *tvb, guint32 offset, proto_tree *tree, guint epdlen)
 975 {
 976         ASN1_SCK asn1;
 977         int start;
 978         gboolean def;
 979         guint length;
 980
 981         guint vb_length;
 982         gushort vb_type;
 983         gchar *vb_type_name;
 984
 985         int ret;
 986         guint cls, con, tag;
 987
 988         subid_t *variable_oid;
 989         guint variable_oid_length;
 990
 991         gint32 vb_integer_value;
 992         guint32 vb_uinteger_value;
 993
 994         guint8 *vb_octet_string;
 995
 996         subid_t *vb_oid;
 997         guint vb_oid_length;
 998
 999         gchar *vb_display_string;
1000
1001         guint variable_length;
1002
1003         unsigned int i;
1004         gchar *buf;
1005         int len;
1006
1007         while (epdlen > 0){ /*while there is stuff to be decoded*/
1008
1009         asn1_open(&asn1, tvb, offset);
1010
1011
1012         /* parse the type of the object */
1013
1014         start = asn1.offset;
1015
1016         ret = asn1_header_decode (&asn1, &cls, &con, &tag, &def, &vb_length);
1017         if (ret != ASN1_ERR_NOERROR)
1018           return 0;
1019         if (!def)
1020           return ASN1_ERR_LENGTH_NOT_DEFINITE;
1021
1022         /* Convert the class, constructed flag, and tag to a type. */
1023         vb_type_name = cops_tag_cls2syntax(tag, cls, &vb_type);
1024         if (vb_type_name == NULL) {
1025                 /*
1026                  * Unsupported type.
1027                  * Dissect the value as an opaque string of octets.
1028                  */
1029                 vb_type_name = "unsupported type";
1030                 vb_type = COPS_OPAQUE;
1031         }
1032
1033         /* parse the value */
1034
1035         switch (vb_type) {
1036
1037         case  COPS_INTEGER :
1038                 ret = asn1_int32_value_decode(&asn1, vb_length,
1039                     &vb_integer_value);
1040                 if (ret != ASN1_ERR_NOERROR)
1041                         return ret;
1042                 length = asn1.offset - start;
1043                 if (tree) {
1044                         proto_tree_add_text(tree, asn1.tvb, offset, length,
1045                             "Value: %s: %d (%#x)", vb_type_name,
1046                             vb_integer_value, vb_integer_value);
1047                 }
1048                 break;
1049
1050
1051         case COPS_UNSIGNED32:
1052         case COPS_TIMETICKS:
1053                 ret = asn1_uint32_value_decode(&asn1, vb_length,
1054                     &vb_uinteger_value);
1055                 if (ret != ASN1_ERR_NOERROR)
1056                         return ret;
1057                 length = asn1.offset - start;
1058                 if (tree) {
1059                         proto_tree_add_text(tree, asn1.tvb, offset, length,
1060                             "Value: %s: %u (%#x)", vb_type_name,
1061                             vb_uinteger_value, vb_uinteger_value);
1062                 }
1063                 break;
1064
1065         case COPS_OCTETSTR:
1066         case COPS_IPADDR:
1067         case COPS_OPAQUE:
1068         case COPS_UNSIGNED64:
1069         case COPS_INTEGER64:
1070                 ret = asn1_string_value_decode (&asn1, vb_length,
1071                     &vb_octet_string);
1072                 if (ret != ASN1_ERR_NOERROR)
1073                         return ret;
1074                 length = asn1.offset - start;
1075                 if (tree) {
1076                         /*
1077                          * If some characters are not printable, display
1078                          * the string as bytes.
1079                          */
1080                         for (i = 0; i < vb_length; i++) {
1081                                 if (!(isprint(vb_octet_string[i])
1082                                     || isspace(vb_octet_string[i])))
1083                                         break;
1084                         }
1085                         if (i < vb_length) {
1086                                 /*
1087                                  * We stopped, due to a non-printable
1088                                  * character, before we got to the end
1089                                  * of the string.
1090                                  */
1091                                 vb_display_string = g_malloc(4*vb_length);
1092                                 buf = &vb_display_string[0];
1093                                 len = sprintf(buf, "%03u", vb_octet_string[0]);
1094                                 buf += len;
1095                                 for (i = 1; i < vb_length; i++) {
1096                                         len = sprintf(buf, ".%03u",
1097                                             vb_octet_string[i]);
1098                                         buf += len;
1099                                 }
1100                                 proto_tree_add_text(tree, asn1.tvb, offset, length,
1101                                     "Value: %s: %s", vb_type_name,
1102                                     vb_display_string);
1103                                 g_free(vb_display_string);
1104                         } else {
1105                                 proto_tree_add_text(tree, asn1.tvb, offset, length,
1106                                     "Value: %s: %.*s", vb_type_name,
1107                                     (int)vb_length,
1108                                     SAFE_STRING(vb_octet_string));
1109                         }
1110                 }
1111                 g_free(vb_octet_string);
1112                 break;
1113
1114         case COPS_NULL:
1115                 ret = asn1_null_decode (&asn1, vb_length);
1116                 if (ret != ASN1_ERR_NOERROR)
1117                         return ret;
1118                 length = asn1.offset - start;
1119                 if (tree) {
1120                         proto_tree_add_text(tree, asn1.tvb, offset, length,
1121                             "Value: %s", vb_type_name);
1122                 }
1123                 break;
1124
1125         case COPS_OBJECTID:
1126                 ret = asn1_oid_value_decode (&asn1, vb_length, &vb_oid,
1127                     &vb_oid_length);
1128                 if (ret != ASN1_ERR_NOERROR)
1129                         return ret;
1130                 length = asn1.offset - start;
1131
1132                 if (tree) {
1133                         vb_display_string = format_oid(vb_oid, vb_oid_length);
1134                         proto_tree_add_text(tree, asn1.tvb, offset, length,
1135                             "Value: %s: %s", vb_type_name, vb_display_string);
1136                         g_free(vb_display_string);
1137                 }
1138
1139 #ifdef OLD
1140
1141                 if (tree) {
1142 #ifdef HAVE_SPRINT_VALUE
1143                         if (!unsafe) {
1144
1145
1146                                 variable.val.objid = vb_oid;
1147                                 vb_display_string = format_var(&variable,
1148                                     variable_oid, variable_oid_length, vb_type,
1149                                     vb_length);
1150                                 proto_tree_add_text(tree, asn1.tvb, offset,
1151                                     length,
1152                                     "Value: %s", vb_display_string);
1153                                 break;  /* we added formatted version to the tree */
1154                         }
1155 #endif /* HAVE_SPRINT_VALUE */
1156
1157                         vb_display_string = format_oid(vb_oid, vb_oid_length);
1158                         proto_tree_add_text(tree, asn1.tvb, offset, length,
1159                             "Value: %s: %s", vb_type_name, vb_display_string);
1160                         g_free(vb_display_string);
1161                 }
1162 #endif
1163
1164
1165                 g_free(vb_oid);
1166                 break;
1167
1168         default:
1169                 g_assert_not_reached();
1170                 return ASN1_ERR_WRONG_TYPE;
1171         }
1172
1173         asn1_close(&asn1,&offset);
1174
1175         epdlen -= length;
1176         }
1177         return 0;
1178 }
1179
1180 static int dissect_cops_pr_object_data(tvbuff_t *tvb, guint32 offset, proto_tree *tree,
1181                                     guint8 s_num, guint8 s_type, guint16 len)
1182 {
1183         proto_item *ti;
1184         proto_tree *gperror_tree, *cperror_tree;
1185         guint16 gperror=0, gperror_sub=0, cperror=0, cperror_sub=0;
1186
1187         switch (s_num){
1188         case COPS_OBJ_PRID:
1189                if (s_type != 1) /* Not Provisioning Instance Identifier (PRID) */
1190                         break;
1191
1192                 ti=proto_tree_add_text(tree, tvb, offset, len, "Contents:");
1193
1194                 decode_cops_pr_asn1_data(tvb, offset, ti, len);
1195
1196                 return 0;
1197
1198                 break;
1199         case COPS_OBJ_PPRID:
1200                 if (s_type != 1) /* Not Prefix Provisioning Instance Identifier (PPRID) */
1201                         break;
1202
1203                 ti = proto_tree_add_text(tree, tvb, offset, len, "Contents:");
1204
1205                 decode_cops_pr_asn1_data(tvb, offset, ti, len);
1206
1207                 return 0;
1208                 break;
1209         case COPS_OBJ_EPD:
1210                 if (s_type != 1) /* Not  Encoded Provisioning Instance Data (EPD) */
1211                         break;
1212
1213                 ti = proto_tree_add_text(tree, tvb, offset, len, "Contents:");
1214
1215                 decode_cops_pr_asn1_data(tvb, offset, ti, len);
1216
1217                 return 0;
1218                 break;
1219         case COPS_OBJ_GPERR:
1220                 if (s_type != 1) /* Not Global Provisioning Error Object (GPERR) */
1221                         break;
1222
1223                 gperror = tvb_get_ntohs(tvb, offset);
1224                 gperror_sub = tvb_get_ntohs(tvb, offset + 2);
1225                 ti = proto_tree_add_text(tree, tvb, offset, 4, "Contents: Error-Code: %s, Error Sub-code: 0x%04x",
1226                                          val_to_str(gperror, cops_gperror_vals, "<Unknown value>"), gperror_sub);
1227                 gperror_tree = proto_item_add_subtree(ti, ett_cops_gperror);
1228                 proto_tree_add_uint(gperror_tree, hf_cops_gperror, tvb, offset, 2, gperror);
1229                 offset += 2;
1230                 if (cperror == 13) {
1231                         proto_tree_add_text(gperror_tree, tvb, offset, 2, "Error Sub-code: "
1232                                             "Unknown object's C-Num %u, C-Type %u",
1233                                             tvb_get_guint8(tvb, offset), tvb_get_guint8(tvb, offset + 1));
1234                 } else
1235                         proto_tree_add_uint(gperror_tree, hf_cops_gperror_sub, tvb, offset, 2, gperror_sub);
1236
1237                 return 0;
1238                 break;
1239         case COPS_OBJ_CPERR:
1240                 if (s_type != 1) /*Not PRC Class Provisioning Error Object (CPERR) */
1241                         break;
1242
1243                 break;
1244
1245                 cperror = tvb_get_ntohs(tvb, offset);
1246                 cperror_sub = tvb_get_ntohs(tvb, offset + 2);
1247                 ti = proto_tree_add_text(tree, tvb, offset, 4, "Contents: Error-Code: %s, Error Sub-code: 0x%04x",
1248                                          val_to_str(cperror, cops_cperror_vals, "<Unknown value>"), cperror_sub);
1249                 cperror_tree = proto_item_add_subtree(ti, ett_cops_cperror);
1250                 proto_tree_add_uint(cperror_tree, hf_cops_cperror, tvb, offset, 2, cperror);
1251                 offset += 2;
1252                 if (cperror == 13) {
1253                         proto_tree_add_text(cperror_tree, tvb, offset, 2, "Error Sub-code: "
1254                                             "Unknown object's S-Num %u, C-Type %u",
1255                                             tvb_get_guint8(tvb, offset), tvb_get_guint8(tvb, offset + 1));
1256                 } else
1257                         proto_tree_add_uint(cperror_tree, hf_cops_cperror_sub, tvb, offset, 2, cperror_sub);
1258
1259                 return 0;
1260                 break;
1261         case COPS_OBJ_ERRPRID:
1262                 if (s_type != 1) /*Not  Error Provisioning Instance Identifier (ErrorPRID)*/
1263                         break;
1264
1265                 ti = proto_tree_add_text(tree, tvb, offset, len, "Contents:");
1266
1267                 decode_cops_pr_asn1_data(tvb, offset, ti, len);
1268
1269                 return 0;
1270                 break;
1271         default:
1272                 break;
1273         }
1274
1275         ti = proto_tree_add_text(tree, tvb, offset, len, "Contents: %u bytes", len);
1276
1277         return 0;
1278 }
1279
1280
1281 /* Register the protocol with Ethereal */
1282 void proto_register_cops(void)
1283 {
1284
1285         /* Setup list of header fields */
1286         static hf_register_info hf[] = {
1287                 { &hf_cops_ver_flags,
1288                         { "Version and Flags",           "cops.ver_flags",
1289                         FT_UINT8, BASE_HEX, NULL, 0x0,
1290                         "Version and Flags in COPS Common Header", HFILL }
1291                 },
1292                 { &hf_cops_version,
1293                         { "Version",           "cops.version",
1294                         FT_UINT8, BASE_DEC, NULL, 0xF0,
1295                         "Version in COPS Common Header", HFILL }
1296                 },
1297                 { &hf_cops_flags,
1298                         { "Flags",           "cops.flags",
1299                         FT_UINT8, BASE_HEX, VALS(cops_flags_vals), 0x0F,
1300                         "Flags in COPS Common Header", HFILL }
1301                 },
1302                 { &hf_cops_op_code,
1303                         { "Op Code",           "cops.op_code",
1304                         FT_UINT8, BASE_DEC, VALS(cops_op_code_vals), 0x0,
1305                         "Op Code in COPS Common Header", HFILL }
1306                 },
1307                 { &hf_cops_client_type,
1308                         { "Client Type",           "cops.client_type",
1309                         FT_UINT16, BASE_DEC, NULL, 0x0,
1310                         "Client Type in COPS Common Header", HFILL }
1311                 },
1312                 { &hf_cops_msg_len,
1313                         { "Message Length",           "cops.msg_len",
1314                         FT_UINT32, BASE_DEC, NULL, 0x0,
1315                         "Message Length in COPS Common Header", HFILL }
1316                 },
1317                 { &hf_cops_obj_len,
1318                         { "Object Length",           "cops.obj.len",
1319                         FT_UINT32, BASE_DEC, NULL, 0x0,
1320                         "Object Length in COPS Object Header", HFILL }
1321                 },
1322                 { &hf_cops_obj_c_num,
1323                         { "C-Num",           "cops.c_num",
1324                         FT_UINT8, BASE_DEC, VALS(cops_c_num_vals), 0x0,
1325                         "C-Num in COPS Object Header", HFILL }
1326                 },
1327                 { &hf_cops_obj_c_type,
1328                         { "C-Type",           "cops.c_type",
1329                         FT_UINT8, BASE_DEC, NULL, 0x0,
1330                         "C-Type in COPS Object Header", HFILL }
1331                 },
1332
1333                 { &hf_cops_obj_s_num,
1334                         { "S-Num",           "cops.s_num",
1335                         FT_UINT8, BASE_DEC, VALS(cops_s_num_vals), 0x0,
1336                         "S-Num in COPS-PR Object Header", HFILL }
1337                 },
1338                 { &hf_cops_obj_s_type,
1339                         { "S-Type",           "cops.s_type",
1340                         FT_UINT8, BASE_DEC, NULL, 0x0,
1341                         "S-Type in COPS-PR Object Header", HFILL }
1342                 },
1343
1344                 { &hf_cops_r_type_flags,
1345                         { "R-Type",           "cops.context.r_type",
1346                         FT_UINT16, BASE_HEX, VALS(cops_r_type_vals), 0xFFFF,
1347                         "R-Type in COPS Context Object", HFILL }
1348                 },
1349                 { &hf_cops_m_type_flags,
1350                         { "M-Type",           "cops.context.m_type",
1351                         FT_UINT16, BASE_HEX, NULL, 0xFFFF,
1352                         "M-Type in COPS Context Object", HFILL }
1353                 },
1354                 { &hf_cops_in_int_ipv4,
1355                         { "IPv4 address",           "cops.in-int.ipv4",
1356                         FT_IPv4, 0, NULL, 0xFFFF,
1357                         "IPv4 address in COPS IN-Int object", HFILL }
1358                 },
1359                 { &hf_cops_in_int_ipv6,
1360                         { "IPv6 address",           "cops.in-int.ipv6",
1361                         FT_IPv6, 0, NULL, 0xFFFF,
1362                         "IPv6 address in COPS IN-Int object", HFILL }
1363                 },
1364                 { &hf_cops_out_int_ipv4,
1365                         { "IPv4 address",           "cops.out-int.ipv4",
1366                         FT_IPv4, 0, NULL, 0xFFFF,
1367                         "IPv4 address in COPS OUT-Int object", HFILL }
1368                 },
1369                 { &hf_cops_out_int_ipv6,
1370                         { "IPv6 address",           "cops.out-int.ipv6",
1371                         FT_IPv6, 0, NULL, 0xFFFF,
1372                         "IPv6 address in COPS OUT-Int", HFILL }
1373                 },
1374                 { &hf_cops_int_ifindex,
1375                         { "ifIndex",           "cops.in-out-int.ifindex",
1376                         FT_UINT32, BASE_DEC, NULL, 0x0,
1377                         "If SNMP is supported, corresponds to MIB-II ifIndex", HFILL }
1378                 },
1379                 { &hf_cops_reason,
1380                         { "Reason",           "cops.reason",
1381                         FT_UINT16, BASE_DEC, VALS(cops_reason_vals), 0,
1382                         "Reason in Reason object", HFILL }
1383                 },
1384                 { &hf_cops_reason_sub,
1385                         { "Reason Sub-code",           "cops.reason_sub",
1386                         FT_UINT16, BASE_HEX, NULL, 0,
1387                         "Reason Sub-code in Reason object", HFILL }
1388                 },
1389                 { &hf_cops_dec_cmd_code,
1390                         { "Command-Code",           "cops.decision.cmd",
1391                         FT_UINT16, BASE_DEC, VALS(cops_dec_cmd_code_vals), 0,
1392                         "Command-Code in Decision/LPDP Decision object", HFILL }
1393                 },
1394                 { &hf_cops_dec_flags,
1395                         { "Flags",           "cops.decision.flags",
1396                         FT_UINT16, BASE_HEX, VALS(cops_dec_cmd_flag_vals), 0xffff,
1397                         "Flags in Decision/LPDP Decision object", HFILL }
1398                 },
1399                 { &hf_cops_error,
1400                         { "Error",           "cops.error",
1401                         FT_UINT16, BASE_DEC, VALS(cops_error_vals), 0,
1402                         "Error in Error object", HFILL }
1403                 },
1404                 { &hf_cops_error_sub,
1405                         { "Error Sub-code",           "cops.error_sub",
1406                         FT_UINT16, BASE_HEX, NULL, 0,
1407                         "Error Sub-code in Error object", HFILL }
1408                 },
1409                 { &hf_cops_katimer,
1410                         { "Contents: KA Timer Value",           "cops.katimer.value",
1411                         FT_UINT16, BASE_DEC, NULL, 0,
1412                         "Keep-Alive Timer Value in KATimer object", HFILL }
1413                 },
1414                 { &hf_cops_pepid,
1415                         { "Contents: PEP Id",           "cops.pepid.id",
1416                         FT_STRING, BASE_NONE, NULL, 0,
1417                         "PEP Id in PEPID object", HFILL }
1418                 },
1419                 { &hf_cops_report_type,
1420                         { "Contents: Report-Type",           "cops.report_type",
1421                         FT_UINT16, BASE_DEC, VALS(cops_report_type_vals), 0,
1422                         "Report-Type in Report-Type object", HFILL }
1423                 },
1424                 { &hf_cops_pdprediraddr_ipv4,
1425                         { "IPv4 address",           "cops.pdprediraddr.ipv4",
1426                         FT_IPv4, 0, NULL, 0xFFFF,
1427                         "IPv4 address in COPS PDPRedirAddr object", HFILL }
1428                 },
1429                 { &hf_cops_pdprediraddr_ipv6,
1430                         { "IPv6 address",           "cops.pdprediraddr.ipv6",
1431                         FT_IPv6, 0, NULL, 0xFFFF,
1432                         "IPv6 address in COPS PDPRedirAddr object", HFILL }
1433                 },
1434                 { &hf_cops_lastpdpaddr_ipv4,
1435                         { "IPv4 address",           "cops.lastpdpaddr.ipv4",
1436                         FT_IPv4, 0, NULL, 0xFFFF,
1437                         "IPv4 address in COPS LastPDPAddr object", HFILL }
1438                 },
1439                 { &hf_cops_lastpdpaddr_ipv6,
1440                         { "IPv6 address",           "cops.lastpdpaddr.ipv6",
1441                         FT_IPv6, 0, NULL, 0xFFFF,
1442                         "IPv6 address in COPS LastPDPAddr object", HFILL }
1443                 },
1444                 { &hf_cops_pdp_tcp_port,
1445                         { "TCP Port Number",           "cops.pdp.tcp_port",
1446                         FT_UINT32, BASE_DEC, NULL, 0x0,
1447                          "TCP Port Number of PDP in PDPRedirAddr/LastPDPAddr object", HFILL }
1448                 },
1449                 { &hf_cops_accttimer,
1450                         { "Contents: ACCT Timer Value",           "cops.accttimer.value",
1451                         FT_UINT16, BASE_DEC, NULL, 0,
1452                         "Accounting Timer Value in AcctTimer object", HFILL }
1453                 },
1454                 { &hf_cops_key_id,
1455                         { "Contents: Key ID",           "cops.integrity.key_id",
1456                         FT_UINT32, BASE_DEC, NULL, 0,
1457                         "Key ID in Integrity object", HFILL }
1458                 },
1459                 { &hf_cops_seq_num,
1460                         { "Contents: Sequence Number",           "cops.integrity.seq_num",
1461                         FT_UINT32, BASE_DEC, NULL, 0,
1462                         "Sequence Number in Integrity object", HFILL }
1463                 },
1464                 { &hf_cops_gperror,
1465                         { "Error",           "cops.gperror",
1466                         FT_UINT16, BASE_DEC, VALS(cops_gperror_vals), 0,
1467                         "Error in Error object", HFILL }
1468                 },
1469                 { &hf_cops_gperror_sub,
1470                         { "Error Sub-code",           "cops.gperror_sub",
1471                         FT_UINT16, BASE_HEX, NULL, 0,
1472                         "Error Sub-code in Error object", HFILL }
1473                 },
1474                 { &hf_cops_cperror,
1475                         { "Error",           "cops.cperror",
1476                         FT_UINT16, BASE_DEC, VALS(cops_cperror_vals), 0,
1477                         "Error in Error object", HFILL }
1478                 },
1479                 { &hf_cops_cperror_sub,
1480                         { "Error Sub-code",           "cops.cperror_sub",
1481                         FT_UINT16, BASE_HEX, NULL, 0,
1482                         "Error Sub-code in Error object", HFILL }
1483                 },
1484
1485         };
1486
1487         /* Setup protocol subtree array */
1488         static gint *ett[] = {
1489                 &ett_cops,
1490                 &ett_cops_ver_flags,
1491                 &ett_cops_obj,
1492                 &ett_cops_obj_data,
1493                 &ett_cops_r_type_flags,
1494                 &ett_cops_itf,
1495                 &ett_cops_reason,
1496                 &ett_cops_decision,
1497                 &ett_cops_error,
1498                 &ett_cops_pdp,
1499                 &ett_cops_pr_obj,
1500         };
1501
1502         module_t* cops_module;
1503
1504         /* Register the protocol name and description */
1505         proto_cops = proto_register_protocol("Common Open Policy Service",
1506             "COPS", "cops");
1507
1508         /* Required function calls to register the header fields and subtrees used */
1509         proto_register_field_array(proto_cops, hf, array_length(hf));
1510         proto_register_subtree_array(ett, array_length(ett));
1511
1512         /* Register our configuration options for cops,
1513          * particularly our ports
1514          */
1515         cops_module = prefs_register_protocol(proto_cops,
1516                                               proto_reg_handoff_cops);
1517         prefs_register_uint_preference(cops_module,"tcp.cops_port",
1518                                        "COPS TCP Port",
1519                                        "Set the TCP port for COPS messages",
1520                                        10,&global_cops_tcp_port);
1521         prefs_register_bool_preference(cops_module, "desegment",
1522             "Desegment all COPS messages spanning multiple TCP segments",
1523             "Whether the COPS dissector should desegment all messages spanning multiple TCP segments",
1524             &cops_desegment);
1525 };
1526
1527 void
1528 proto_reg_handoff_cops(void)
1529 {
1530         static int cops_prefs_initialized = FALSE;
1531         static dissector_handle_t cops_handle;
1532
1533         if(!cops_prefs_initialized){
1534           cops_handle = create_dissector_handle(dissect_cops, proto_cops);
1535           cops_prefs_initialized = TRUE;
1536         }
1537         else {
1538           dissector_delete("tcp.port",cops_tcp_port,cops_handle);
1539         }
1540
1541         /* Set our port numbers for future use */
1542         cops_tcp_port = global_cops_tcp_port;
1543
1544         dissector_add("tcp.port", cops_tcp_port, cops_handle);
1545 }