epan/dissectors/packet-dsi.c

   1 /* packet-dsi.c
   2  * Routines for dsi packet dissection
   3  * Copyright 2001, Randy McEoin <rmceoin@pe.com>
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * Copied from packet-pop.c
  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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  26  */
  27
  28 #include "config.h"
  29
  30 #include <glib.h>
  31 #include <epan/packet.h>
  32
  33 #include <epan/prefs.h>
  34 #include "packet-tcp.h"
  35 #include "packet-afp.h"
  36
  37 /* The information in this module (DSI) comes from:
  38
  39   AFP 2.1 & 2.2 documentation, in PDF form, at
  40
  41 http://developer.apple.com/DOCUMENTATION/macos8/pdf/ASAppleTalkFiling2.1_2.2.pdf
  42
  43   The netatalk source code by Wesley Craig & Adrian Sun
  44
  45   The Data Stream Interface description from
  46   http://developer.apple.com/documentation/Networking/Conceptual/AFPClient/AFPClient-6.html
  47
  48 (no longer available, apparently)
  49
  50   Also, AFP 3.3 documents parts of DSI at:
  51   http://developer.apple.com/mac/library/documentation/Networking/Conceptual/AFP/Introduction/Introduction.html
  52
  53  * What a Data Stream Interface packet looks like:
  54  * 0                               32
  55  * |-------------------------------|
  56  * |flags  |command| requestID     |
  57  * |-------------------------------|
  58  * |error code/enclosed data offset|
  59  * |-------------------------------|
  60  * |total data length              |
  61  * |-------------------------------|
  62  * |reserved field                 |
  63  * |-------------------------------|
  64  */
  65 #define INET6_ADDRLEN  16
  66
  67 static int proto_dsi = -1;
  68 static int hf_dsi_flags = -1;
  69 static int hf_dsi_command = -1;
  70 static int hf_dsi_requestid = -1;
  71 static int hf_dsi_offset = -1;
  72 static int hf_dsi_error = -1;
  73 static int hf_dsi_length = -1;
  74 static int hf_dsi_reserved = -1;
  75
  76 static gint ett_dsi = -1;
  77
  78 static int hf_dsi_open_type     = -1;
  79 static int hf_dsi_open_len      = -1;
  80 static int hf_dsi_open_quantum  = -1;
  81 static int hf_dsi_replay_cache_size = -1;
  82 static int hf_dsi_open_option   = -1;
  83
  84 static int hf_dsi_attn_flag             = -1;
  85 static int hf_dsi_attn_flag_shutdown    = -1;
  86 static int hf_dsi_attn_flag_crash       = -1;
  87 static int hf_dsi_attn_flag_msg         = -1;
  88 static int hf_dsi_attn_flag_reconnect   = -1;
  89 static int hf_dsi_attn_flag_time        = -1;
  90 static int hf_dsi_attn_flag_bitmap      = -1;
  91
  92 static gint ett_dsi_open        = -1;
  93 static gint ett_dsi_attn        = -1;
  94 static gint ett_dsi_attn_flag   = -1;
  95
  96 static const value_string dsi_attn_flag_vals[] = {
  97         {0x0, "Reserved" },                                           /* 0000 */
  98         {0x1, "Reserved" },                                           /* 0001 */
  99         {0x2, "Server message" },                                     /* 0010 */
 100         {0x3, "Server notification, cf. extended bitmap" },           /* 0011 */
 101         {0x4, "Server is shutting down, internal error" },            /* 0100 */
 102         {0x8, "Server is shutting down" },                            /* 1000 */
 103         {0x9, "Server disconnects user" },                            /* 1001 */
 104         {0x10,"Server is shutting down, message" },                   /* 1010 */
 105         {0x11,"Server is shutting down, message,no reconnect"},       /* 1011 */
 106         {0,                   NULL } };
 107 static value_string_ext dsi_attn_flag_vals_ext = VALUE_STRING_EXT_INIT(dsi_attn_flag_vals);
 108
 109 static const value_string dsi_open_type_vals[] = {
 110         {0,   "Server quantum" },
 111         {1,   "Attention quantum" },
 112         {2,   "Replay cache size" },
 113         {0,                   NULL } };
 114
 115 /* status stuff same for asp and afp */
 116 static int hf_dsi_server_name = -1;
 117 static int hf_dsi_utf8_server_name_len = -1;
 118 static int hf_dsi_utf8_server_name = -1;
 119 static int hf_dsi_server_type = -1;
 120 static int hf_dsi_server_vers = -1;
 121 static int hf_dsi_server_uams = -1;
 122 static int hf_dsi_server_icon = -1;
 123 static int hf_dsi_server_directory = -1;
 124
 125 static int hf_dsi_server_flag = -1;
 126 static int hf_dsi_server_flag_copyfile = -1;
 127 static int hf_dsi_server_flag_passwd   = -1;
 128 static int hf_dsi_server_flag_no_save_passwd = -1;
 129 static int hf_dsi_server_flag_srv_msg   = -1;
 130 static int hf_dsi_server_flag_srv_sig   = -1;
 131 static int hf_dsi_server_flag_tcpip     = -1;
 132 static int hf_dsi_server_flag_notify    = -1;
 133 static int hf_dsi_server_flag_reconnect = -1;
 134 static int hf_dsi_server_flag_directory = -1;
 135 static int hf_dsi_server_flag_utf8_name = -1;
 136 static int hf_dsi_server_flag_uuid      = -1;
 137 static int hf_dsi_server_flag_ext_sleep = -1;
 138 static int hf_dsi_server_flag_fast_copy = -1;
 139 static int hf_dsi_server_signature      = -1;
 140
 141 static int hf_dsi_server_addr_len       = -1;
 142 static int hf_dsi_server_addr_type      = -1;
 143 static int hf_dsi_server_addr_value     = -1;
 144
 145 static gint ett_dsi_status = -1;
 146 static gint ett_dsi_uams   = -1;
 147 static gint ett_dsi_vers   = -1;
 148 static gint ett_dsi_addr   = -1;
 149 static gint ett_dsi_addr_line = -1;
 150 static gint ett_dsi_directory = -1;
 151 static gint ett_dsi_utf8_name = -1;
 152 static gint ett_dsi_status_server_flag = -1;
 153
 154 static const value_string afp_server_addr_type_vals[] = {
 155         {1,   "IP address" },
 156         {2,   "IP+port address" },
 157         {3,   "DDP address" },
 158         {4,   "DNS name" },
 159         {5,   "IP+port ssh tunnel" },
 160         {6,   "IP6 address" },
 161         {7,   "IP6+port address" },
 162         {0,   NULL } };
 163 value_string_ext afp_server_addr_type_vals_ext = VALUE_STRING_EXT_INIT(afp_server_addr_type_vals);
 164
 165 /* end status stuff */
 166
 167 /* desegmentation of DSI */
 168 static gboolean dsi_desegment = TRUE;
 169
 170 static dissector_handle_t data_handle;
 171 static dissector_handle_t afp_handle;
 172
 173 #define TCP_PORT_DSI      548
 174
 175 #define DSI_BLOCKSIZ       16
 176
 177 /* DSI flags */
 178 #define DSIFL_REQUEST    0x00
 179 #define DSIFL_REPLY      0x01
 180 #define DSIFL_MAX        0x01
 181
 182 /* DSI Commands */
 183 #define DSIFUNC_CLOSE   1       /* DSICloseSession */
 184 #define DSIFUNC_CMD     2       /* DSICommand */
 185 #define DSIFUNC_STAT    3       /* DSIGetStatus */
 186 #define DSIFUNC_OPEN    4       /* DSIOpenSession */
 187 #define DSIFUNC_TICKLE  5       /* DSITickle */
 188 #define DSIFUNC_WRITE   6       /* DSIWrite */
 189 #define DSIFUNC_ATTN    8       /* DSIAttention */
 190 #define DSIFUNC_MAX     8       /* largest command */
 191
 192 static const value_string flag_vals[] = {
 193         {DSIFL_REQUEST,       "Request" },
 194         {DSIFL_REPLY,         "Reply" },
 195         {0,                   NULL } };
 196
 197 static const value_string func_vals[] = {
 198         {DSIFUNC_CLOSE,       "CloseSession" },
 199         {DSIFUNC_CMD,         "Command" },
 200         {DSIFUNC_STAT,        "GetStatus" },
 201         {DSIFUNC_OPEN,        "OpenSession" },
 202         {DSIFUNC_TICKLE,      "Tickle" },
 203         {DSIFUNC_WRITE,       "Write" },
 204         { 7,                  "Unknown" },
 205         {DSIFUNC_ATTN,        "Attention" },
 206         {0,                   NULL } };
 207 static value_string_ext func_vals_ext = VALUE_STRING_EXT_INIT(func_vals);
 208
 209 static gint
 210 dissect_dsi_open_session(tvbuff_t *tvb, proto_tree *dsi_tree, gint offset, gint dsi_length)
 211 {
 212         proto_tree      *tree;
 213         proto_item      *ti;
 214         guint8          type;
 215         guint8          len;
 216
 217         ti = proto_tree_add_text(dsi_tree, tvb, offset, -1, "Open Session");
 218         tree = proto_item_add_subtree(ti, ett_dsi_open);
 219
 220         while( dsi_length >2 ) {
 221
 222                 type = tvb_get_guint8(tvb, offset);
 223                 proto_tree_add_item(tree, hf_dsi_open_type, tvb, offset, 1, ENC_BIG_ENDIAN);
 224                 offset++;
 225                 len = tvb_get_guint8(tvb, offset);
 226                 proto_tree_add_item(tree, hf_dsi_open_len, tvb, offset, 1, ENC_BIG_ENDIAN);
 227                 offset++;
 228                 switch (type) {
 229                         case 0:
 230                                 proto_tree_add_item(tree, hf_dsi_open_quantum, tvb, offset, 4, ENC_BIG_ENDIAN);
 231                                 break;
 232                         case 1:
 233                                 proto_tree_add_item(tree, hf_dsi_open_quantum, tvb, offset, 4, ENC_BIG_ENDIAN);
 234                                 break;
 235                         case 2:
 236                                 proto_tree_add_item(tree, hf_dsi_replay_cache_size, tvb, offset, 4, ENC_BIG_ENDIAN);
 237                                 break;
 238                         default:
 239                                 proto_tree_add_item(tree, hf_dsi_open_option, tvb, offset, len, ENC_NA);
 240                 }
 241
 242                 dsi_length -= len + 2;
 243
 244                 offset += len;
 245         }
 246         return offset;
 247 }
 248
 249 static gint
 250 dissect_dsi_attention(tvbuff_t *tvb, proto_tree *dsi_tree, gint offset)
 251 {
 252         proto_tree      *tree;
 253         proto_item      *ti;
 254         guint16         flag;
 255
 256         if (!tvb_reported_length_remaining(tvb,offset))
 257                 return offset;
 258
 259         flag = tvb_get_ntohs(tvb, offset);
 260         ti = proto_tree_add_text(dsi_tree, tvb, offset, -1, "Attention");
 261         tree = proto_item_add_subtree(ti, ett_dsi_attn);
 262
 263         ti = proto_tree_add_item(tree, hf_dsi_attn_flag, tvb, offset, 2, ENC_BIG_ENDIAN);
 264         tree = proto_item_add_subtree(ti, ett_dsi_attn_flag);
 265         proto_tree_add_item(tree, hf_dsi_attn_flag_shutdown, tvb, offset, 2, ENC_BIG_ENDIAN);
 266         proto_tree_add_item(tree, hf_dsi_attn_flag_crash, tvb, offset, 2, ENC_BIG_ENDIAN);
 267         proto_tree_add_item(tree, hf_dsi_attn_flag_msg, tvb, offset, 2, ENC_BIG_ENDIAN);
 268         proto_tree_add_item(tree, hf_dsi_attn_flag_reconnect, tvb, offset, 2, ENC_BIG_ENDIAN);
 269         /* FIXME */
 270         if ((flag & 0xf000) != 0x3000)
 271                 proto_tree_add_item(tree, hf_dsi_attn_flag_time, tvb, offset, 2, ENC_BIG_ENDIAN);
 272         else
 273                 proto_tree_add_item(tree, hf_dsi_attn_flag_bitmap, tvb, offset, 2, ENC_BIG_ENDIAN);
 274         offset += 2;
 275         return offset;
 276 }
 277
 278 /* -----------------------------
 279         from netatalk/etc/afpd/status.c
 280 */
 281 static gint
 282 dissect_dsi_reply_get_status(tvbuff_t *tvb, proto_tree *tree, gint offset)
 283 {
 284         proto_tree      *sub_tree;
 285         proto_item      *ti;
 286
 287         guint16 ofs;
 288         guint16 flag;
 289         guint16 sign_ofs = 0;
 290         guint16 adr_ofs = 0;
 291         guint16 dir_ofs = 0;
 292         guint16 utf_ofs = 0;
 293         guint8  nbe;
 294         guint8  len;
 295         guint8  i;
 296
 297         if (!tree)
 298                 return offset;
 299
 300         ti = proto_tree_add_text(tree, tvb, offset, -1, "Get Status");
 301         tree = proto_item_add_subtree(ti, ett_dsi_status);
 302
 303         ofs = tvb_get_ntohs(tvb, offset +AFPSTATUS_MACHOFF);
 304         proto_tree_add_text(tree, tvb, offset +AFPSTATUS_MACHOFF, 2, "Machine offset: %d", ofs);
 305
 306         ofs = tvb_get_ntohs(tvb, offset +AFPSTATUS_VERSOFF);
 307         proto_tree_add_text(tree, tvb, offset +AFPSTATUS_VERSOFF, 2, "Version offset: %d", ofs);
 308
 309         ofs = tvb_get_ntohs(tvb, offset +AFPSTATUS_UAMSOFF);
 310         proto_tree_add_text(tree, tvb, offset +AFPSTATUS_UAMSOFF, 2, "UAMS offset: %d", ofs);
 311
 312         ofs = tvb_get_ntohs(tvb, offset +AFPSTATUS_ICONOFF);
 313         proto_tree_add_text(tree, tvb, offset +AFPSTATUS_ICONOFF, 2, "Icon offset: %d", ofs);
 314
 315         ofs = offset +AFPSTATUS_FLAGOFF;
 316         ti = proto_tree_add_item(tree, hf_dsi_server_flag, tvb, ofs, 2, ENC_BIG_ENDIAN);
 317         sub_tree = proto_item_add_subtree(ti, ett_dsi_status_server_flag);
 318         proto_tree_add_item(sub_tree, hf_dsi_server_flag_copyfile      , tvb, ofs, 2, ENC_BIG_ENDIAN);
 319         proto_tree_add_item(sub_tree, hf_dsi_server_flag_passwd        , tvb, ofs, 2, ENC_BIG_ENDIAN);
 320         proto_tree_add_item(sub_tree, hf_dsi_server_flag_no_save_passwd, tvb, ofs, 2, ENC_BIG_ENDIAN);
 321         proto_tree_add_item(sub_tree, hf_dsi_server_flag_srv_msg       , tvb, ofs, 2, ENC_BIG_ENDIAN);
 322         proto_tree_add_item(sub_tree, hf_dsi_server_flag_srv_sig       , tvb, ofs, 2, ENC_BIG_ENDIAN);
 323         proto_tree_add_item(sub_tree, hf_dsi_server_flag_tcpip         , tvb, ofs, 2, ENC_BIG_ENDIAN);
 324         proto_tree_add_item(sub_tree, hf_dsi_server_flag_notify        , tvb, ofs, 2, ENC_BIG_ENDIAN);
 325         proto_tree_add_item(sub_tree, hf_dsi_server_flag_reconnect     , tvb, ofs, 2, ENC_BIG_ENDIAN);
 326         proto_tree_add_item(sub_tree, hf_dsi_server_flag_directory     , tvb, ofs, 2, ENC_BIG_ENDIAN);
 327         proto_tree_add_item(sub_tree, hf_dsi_server_flag_utf8_name     , tvb, ofs, 2, ENC_BIG_ENDIAN);
 328         proto_tree_add_item(sub_tree, hf_dsi_server_flag_uuid          , tvb, ofs, 2, ENC_BIG_ENDIAN);
 329         proto_tree_add_item(sub_tree, hf_dsi_server_flag_ext_sleep     , tvb, ofs, 2, ENC_BIG_ENDIAN);
 330         proto_tree_add_item(sub_tree, hf_dsi_server_flag_fast_copy     , tvb, ofs, 2, ENC_BIG_ENDIAN);
 331
 332         proto_tree_add_item(tree, hf_dsi_server_name, tvb, offset +AFPSTATUS_PRELEN, 1, ENC_ASCII|ENC_NA);
 333
 334         flag = tvb_get_ntohs(tvb, ofs);
 335         if ((flag & AFPSRVRINFO_SRVSIGNATURE)) {
 336                 ofs = offset +AFPSTATUS_PRELEN +tvb_get_guint8(tvb, offset +AFPSTATUS_PRELEN) +1;
 337                 if ((ofs & 1))
 338                         ofs++;
 339
 340                 sign_ofs = tvb_get_ntohs(tvb, ofs);
 341                 proto_tree_add_text(tree, tvb, ofs, 2, "Signature offset: %d", sign_ofs);
 342                 sign_ofs += offset;
 343
 344                 if ((flag & AFPSRVRINFO_TCPIP)) {
 345                         ofs += 2;
 346                         adr_ofs =  tvb_get_ntohs(tvb, ofs);
 347                         proto_tree_add_text(tree, tvb, ofs, 2, "Network address offset: %d", adr_ofs);
 348                         adr_ofs += offset;
 349                 }
 350
 351                 if ((flag & AFPSRVRINFO_SRVDIRECTORY)) {
 352                         ofs += 2;
 353                         dir_ofs =  tvb_get_ntohs(tvb, ofs);
 354                         proto_tree_add_text(tree, tvb, ofs, 2, "Directory services offset: %d", dir_ofs);
 355                         dir_ofs += offset;
 356                 }
 357                 if ((flag & AFPSRVRINFO_SRVUTF8)) {
 358                         ofs += 2;
 359                         utf_ofs =  tvb_get_ntohs(tvb, ofs);
 360                         proto_tree_add_text(tree, tvb, ofs, 2, "UTF8 server name offset: %d", utf_ofs);
 361                         utf_ofs += offset;
 362                 }
 363         }
 364
 365         ofs = offset +tvb_get_ntohs(tvb, offset +AFPSTATUS_MACHOFF);
 366         if (ofs)
 367                 proto_tree_add_item(tree, hf_dsi_server_type, tvb, ofs, 1, ENC_ASCII|ENC_NA);
 368
 369         ofs = offset +tvb_get_ntohs(tvb, offset +AFPSTATUS_VERSOFF);
 370         if (ofs) {
 371                 nbe = tvb_get_guint8(tvb, ofs);
 372                 ti = proto_tree_add_text(tree, tvb, ofs, 1, "Version list: %d", nbe);
 373                 ofs++;
 374                 sub_tree = proto_item_add_subtree(ti, ett_dsi_vers);
 375                 for (i = 0; i < nbe; i++) {
 376                         len = tvb_get_guint8(tvb, ofs);
 377                         proto_tree_add_item(sub_tree, hf_dsi_server_vers, tvb, ofs, 1, ENC_ASCII|ENC_NA);
 378                         ofs += len + 1;
 379                 }
 380         }
 381
 382         ofs = offset +tvb_get_ntohs(tvb, offset +AFPSTATUS_UAMSOFF);
 383         if (ofs) {
 384                 nbe = tvb_get_guint8(tvb, ofs);
 385                 ti = proto_tree_add_text(tree, tvb, ofs, 1, "UAMS list: %d", nbe);
 386                 ofs++;
 387                 sub_tree = proto_item_add_subtree(ti, ett_dsi_uams);
 388                 for (i = 0; i < nbe; i++) {
 389                         len = tvb_get_guint8(tvb, ofs);
 390                         proto_tree_add_item(sub_tree, hf_dsi_server_uams, tvb, ofs, 1, ENC_ASCII|ENC_NA);
 391                         ofs += len + 1;
 392                 }
 393         }
 394
 395         ofs = offset +tvb_get_ntohs(tvb, offset +AFPSTATUS_ICONOFF);
 396         if (ofs)
 397                 proto_tree_add_item(tree, hf_dsi_server_icon, tvb, ofs, 256, ENC_NA);
 398
 399         if (sign_ofs) {
 400                 proto_tree_add_item(tree, hf_dsi_server_signature, tvb, sign_ofs, 16, ENC_NA);
 401         }
 402
 403         if (adr_ofs) {
 404                 proto_tree *adr_tree;
 405                 unsigned char *tmp;
 406                 guint16 net;
 407                 guint8  node;
 408                 guint16 port;
 409
 410                 ofs = adr_ofs;
 411                 nbe = tvb_get_guint8(tvb, ofs);
 412                 ti = proto_tree_add_text(tree, tvb, ofs, 1, "Address list: %d", nbe);
 413                 ofs++;
 414                 adr_tree = proto_item_add_subtree(ti, ett_dsi_addr);
 415                 for (i = 0; i < nbe; i++) {
 416                         guint8 type;
 417
 418                         len = tvb_get_guint8(tvb, ofs);
 419                         type =  tvb_get_guint8(tvb, ofs +1);
 420                         switch (type) {
 421                         case 1: /* IP */
 422                                 ti = proto_tree_add_text(adr_tree, tvb, ofs, len, "ip: %s", tvb_ip_to_str(tvb, ofs+2));
 423                                 break;
 424                         case 2: /* IP + port */
 425                                 port = tvb_get_ntohs(tvb, ofs+6);
 426                                 ti = proto_tree_add_text(adr_tree, tvb, ofs, len, "ip %s:%d", tvb_ip_to_str(tvb, ofs+2), port);
 427                                 break;
 428                         case 3: /* DDP, atalk_addr_to_str want host order not network */
 429                                 net  = tvb_get_ntohs(tvb, ofs+2);
 430                                 node = tvb_get_guint8(tvb, ofs +4);
 431                                 port = tvb_get_guint8(tvb, ofs +5);
 432                                 ti = proto_tree_add_text(adr_tree, tvb, ofs, len, "ddp: %u.%u:%u",
 433                                         net, node, port);
 434                                 break;
 435                         case 4: /* DNS */
 436                         case 5: /* SSH tunnel */
 437                                 if (len > 2) {
 438                                         tmp = tvb_get_ephemeral_string(tvb, ofs +2, len -2);
 439                                         ti = proto_tree_add_text(adr_tree, tvb, ofs, len, "%s: %s",
 440                                                                 (type==4)?"dns":"ssh tunnel", tmp);
 441                                         break;
 442                                 }
 443                                 else {
 444                                         ti = proto_tree_add_text(adr_tree, tvb, ofs, len,"Malformed address type %d", type);
 445                                 }
 446                                 break;
 447                         case 6: /* IP6 */
 448                                 ti = proto_tree_add_text(adr_tree, tvb, ofs, len, "ip6: %s",
 449                                                 tvb_ip6_to_str(tvb, ofs+2));
 450                                 break;
 451                         case 7: /* IP6 + 2bytes port */
 452                                 port = tvb_get_ntohs(tvb, ofs+ 2+INET6_ADDRLEN);
 453                                 ti = proto_tree_add_text(adr_tree, tvb, ofs, len, "ip6 %s:%d",
 454                                                 tvb_ip6_to_str(tvb, ofs+2), port);
 455                                 break;
 456                         default:
 457                                 ti = proto_tree_add_text(adr_tree, tvb, ofs, len,"Unknown type : %d", type);
 458                                 break;
 459                         }
 460                         len -= 2;
 461                         sub_tree = proto_item_add_subtree(ti,ett_dsi_addr_line);
 462                         proto_tree_add_item(sub_tree, hf_dsi_server_addr_len, tvb, ofs, 1, ENC_BIG_ENDIAN);
 463                         ofs++;
 464                         proto_tree_add_item(sub_tree, hf_dsi_server_addr_type, tvb, ofs, 1, ENC_BIG_ENDIAN);
 465                         ofs++;
 466                         proto_tree_add_item(sub_tree, hf_dsi_server_addr_value,tvb, ofs, len, ENC_NA);
 467                         ofs += len;
 468                 }
 469         }
 470
 471         if (dir_ofs) {
 472                 ofs = dir_ofs;
 473                 nbe = tvb_get_guint8(tvb, ofs);
 474                 ti = proto_tree_add_text(tree, tvb, ofs, 1, "Directory services list: %d", nbe);
 475                 ofs++;
 476                 sub_tree = proto_item_add_subtree(ti, ett_dsi_directory);
 477                 for (i = 0; i < nbe; i++) {
 478                         len = tvb_get_guint8(tvb, ofs);
 479                         proto_tree_add_item(sub_tree, hf_dsi_server_directory, tvb, ofs, 1, ENC_ASCII|ENC_NA);
 480                         ofs += len + 1;
 481                 }
 482         }
 483         if (utf_ofs) {
 484                 guint16 ulen;
 485                 char *tmp;
 486
 487                 ofs = utf_ofs;
 488                 ulen = tvb_get_ntohs(tvb, ofs);
 489                 tmp = tvb_get_ephemeral_string(tvb, ofs + 2, ulen);
 490                 ti = proto_tree_add_text(tree, tvb, ofs, ulen + 2, "UTF8 server name: %s", tmp);
 491                 sub_tree = proto_item_add_subtree(ti, ett_dsi_utf8_name);
 492                 proto_tree_add_uint(sub_tree, hf_dsi_utf8_server_name_len, tvb, ofs, 2, ulen);
 493                 ofs += 2;
 494                 proto_tree_add_string(sub_tree, hf_dsi_utf8_server_name, tvb, ofs, ulen, tmp);
 495                 ofs += ulen;
 496         }
 497
 498         return ofs;
 499 }
 500
 501 static void
 502 dissect_dsi_packet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 503 {
 504         proto_tree      *dsi_tree;
 505         proto_item      *ti;
 506         guint8          dsi_flags,dsi_command;
 507         guint16         dsi_requestid;
 508         gint32          dsi_code;
 509         guint32         dsi_length;
 510         guint32         dsi_reserved;
 511         struct          aspinfo aspinfo;
 512         gint            col_info;
 513
 514
 515         col_set_str(pinfo->cinfo, COL_PROTOCOL, "DSI");
 516         col_info = check_col(pinfo->cinfo, COL_INFO);
 517         if (col_info)
 518                 col_clear(pinfo->cinfo, COL_INFO);
 519
 520         dsi_flags = tvb_get_guint8(tvb, 0);
 521         dsi_command = tvb_get_guint8(tvb, 1);
 522         dsi_requestid = tvb_get_ntohs(tvb, 2);
 523         dsi_code = tvb_get_ntohl(tvb, 4);
 524         dsi_length = tvb_get_ntohl(tvb, 8);
 525         dsi_reserved = tvb_get_ntohl(tvb, 12);
 526
 527         if (col_info) {
 528                 col_add_fstr(pinfo->cinfo, COL_INFO, "%s %s (%u)",
 529                         val_to_str(dsi_flags, flag_vals,
 530                                    "Unknown flag (0x%02x)"),
 531                         val_to_str_ext(dsi_command, &func_vals_ext,
 532                                    "Unknown function (0x%02x)"),
 533                         dsi_requestid);
 534         }
 535
 536
 537         if (tree) {
 538                 ti = proto_tree_add_item(tree, proto_dsi, tvb, 0, -1, ENC_NA);
 539                 dsi_tree = proto_item_add_subtree(ti, ett_dsi);
 540
 541                 proto_tree_add_uint(dsi_tree, hf_dsi_flags, tvb,
 542                         0, 1, dsi_flags);
 543                 proto_tree_add_uint(dsi_tree, hf_dsi_command, tvb,
 544                         1, 1, dsi_command);
 545                 proto_tree_add_uint(dsi_tree, hf_dsi_requestid, tvb,
 546                         2, 2, dsi_requestid);
 547                 switch (dsi_flags) {
 548
 549                 case DSIFL_REQUEST:
 550                         proto_tree_add_int(dsi_tree, hf_dsi_offset, tvb,
 551                                 4, 4, dsi_code);
 552                         break;
 553
 554                 case DSIFL_REPLY:
 555                         proto_tree_add_int(dsi_tree, hf_dsi_error, tvb,
 556                                 4, 4, dsi_code);
 557                         break;
 558                 }
 559                 proto_tree_add_uint_format(dsi_tree, hf_dsi_length, tvb,
 560                         8, 4, dsi_length,
 561                         "Length: %u bytes", dsi_length);
 562                 proto_tree_add_uint(dsi_tree, hf_dsi_reserved, tvb,
 563                         12, 4, dsi_reserved);
 564         }
 565         else
 566                 dsi_tree = tree;
 567         switch (dsi_command) {
 568         case DSIFUNC_OPEN:
 569                 if (tree) {
 570                         dissect_dsi_open_session(tvb, dsi_tree, DSI_BLOCKSIZ, dsi_length);
 571                 }
 572                 break;
 573         case DSIFUNC_ATTN:
 574                 if (tree) {
 575                         dissect_dsi_attention(tvb, dsi_tree, DSI_BLOCKSIZ);
 576                 }
 577                 break;
 578         case DSIFUNC_STAT:
 579                 if (tree && (dsi_flags == DSIFL_REPLY)) {
 580                         dissect_dsi_reply_get_status(tvb, dsi_tree, DSI_BLOCKSIZ);
 581                 }
 582                 break;
 583         case DSIFUNC_CMD:
 584         case DSIFUNC_WRITE:
 585                 {
 586                         tvbuff_t   *new_tvb;
 587                         void* pd_save;
 588                         int len = tvb_reported_length_remaining(tvb,DSI_BLOCKSIZ);
 589
 590                         aspinfo.reply = (dsi_flags == DSIFL_REPLY);
 591                         aspinfo.command = dsi_command;
 592                         aspinfo.seq = dsi_requestid;
 593                         aspinfo.code = dsi_code;
 594                         pd_save = pinfo->private_data;
 595                         pinfo->private_data = &aspinfo;
 596                         proto_item_set_len(dsi_tree, DSI_BLOCKSIZ);
 597
 598                         new_tvb = tvb_new_subset(tvb, DSI_BLOCKSIZ,-1,len);
 599                         call_dissector(afp_handle, new_tvb, pinfo, tree);
 600                         pinfo->private_data = pd_save;
 601                 }
 602                 break;
 603         default:
 604                 if (tree) {
 605                         call_dissector(data_handle,
 606                                        tvb_new_subset_remaining(tvb, DSI_BLOCKSIZ),
 607                                        pinfo, dsi_tree);
 608                 }
 609                 break;
 610         }
 611 }
 612
 613 static guint
 614 get_dsi_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
 615 {
 616         guint32 plen;
 617         guint8  dsi_flags,dsi_command;
 618
 619         dsi_flags = tvb_get_guint8(tvb, offset);
 620         dsi_command = tvb_get_guint8(tvb, offset+ 1);
 621         if ( dsi_flags > DSIFL_MAX || !dsi_command || dsi_command > DSIFUNC_MAX)
 622         {
 623             /* it's not a known dsi pdu start sequence */
 624             return tvb_length_remaining(tvb, offset);
 625         }
 626
 627         /*
 628          * Get the length of the DSI packet.
 629          */
 630         plen = tvb_get_ntohl(tvb, offset+8);
 631
 632         /*
 633          * That length doesn't include the length of the header itself;
 634          * add that in.
 635          */
 636         return plen + 16;
 637 }
 638
 639 static void
 640 dissect_dsi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 641 {
 642         tcp_dissect_pdus(tvb, pinfo, tree, dsi_desegment, 12,
 643             get_dsi_pdu_len, dissect_dsi_packet);
 644 }
 645
 646 void
 647 proto_register_dsi(void)
 648 {
 649
 650         static hf_register_info hf[] = {
 651                 { &hf_dsi_flags,
 652                   { "Flags",            "dsi.flags",
 653                     FT_UINT8, BASE_HEX, VALS(flag_vals), 0x0,
 654                     "Indicates request or reply.", HFILL }},
 655
 656                 { &hf_dsi_command,
 657                   { "Command",          "dsi.command",
 658                     FT_UINT8, BASE_DEC|BASE_EXT_STRING, &func_vals_ext, 0x0,
 659                     "Represents a DSI command.", HFILL }},
 660
 661                 { &hf_dsi_requestid,
 662                   { "Request ID",       "dsi.requestid",
 663                     FT_UINT16, BASE_DEC, NULL, 0x0,
 664                     "Keeps track of which request this is.  Replies must match a Request.  IDs must be generated in sequential order.", HFILL }},
 665
 666                 { &hf_dsi_offset,
 667                   { "Data offset",      "dsi.data_offset",
 668                     FT_INT32, BASE_DEC, NULL, 0x0,
 669                     NULL, HFILL }},
 670
 671                 { &hf_dsi_error,
 672                   { "Error code",       "dsi.error_code",
 673                     FT_INT32, BASE_DEC|BASE_EXT_STRING, &asp_error_vals_ext, 0x0,
 674                     NULL, HFILL }},
 675
 676                 { &hf_dsi_length,
 677                   { "Length",           "dsi.length",
 678                     FT_UINT32, BASE_DEC, NULL, 0x0,
 679                     "Total length of the data that follows the DSI header.", HFILL }},
 680
 681                 { &hf_dsi_reserved,
 682                   { "Reserved",         "dsi.reserved",
 683                     FT_UINT32, BASE_HEX, NULL, 0x0,
 684                     "Reserved for future use.  Should be set to zero.", HFILL }},
 685                 /* asp , afp */
 686                 { &hf_dsi_utf8_server_name_len,
 687                   { "Length",          "dsi.utf8_server_name_len",
 688                     FT_UINT16, BASE_DEC, NULL, 0x0,
 689                     "UTF8 server name length.", HFILL }},
 690                 { &hf_dsi_utf8_server_name,
 691                   { "UTF8 Server name",         "dsi.utf8_server_name",
 692                     FT_STRING, BASE_NONE, NULL, 0x0,
 693                     NULL, HFILL }},
 694
 695                 { &hf_dsi_server_name,
 696                   { "Server name",         "dsi.server_name",
 697                     FT_UINT_STRING, BASE_NONE, NULL, 0x0,
 698                     NULL, HFILL }},
 699
 700                 { &hf_dsi_server_type,
 701                   { "Server type",         "dsi.server_type",
 702                     FT_UINT_STRING, BASE_NONE, NULL, 0x0,
 703                     NULL, HFILL }},
 704
 705                 { &hf_dsi_server_vers,
 706                   { "AFP version",         "dsi.server_vers",
 707                     FT_UINT_STRING, BASE_NONE, NULL, 0x0,
 708                     NULL, HFILL }},
 709
 710                 { &hf_dsi_server_uams,
 711                   { "UAM",         "dsi.server_uams",
 712                     FT_UINT_STRING, BASE_NONE, NULL, 0x0,
 713                     NULL, HFILL }},
 714
 715                 { &hf_dsi_server_icon,
 716                   { "Icon bitmap",         "dsi.server_icon",
 717                     FT_BYTES, BASE_NONE, NULL, 0x0,
 718                     "Server icon bitmap", HFILL }},
 719
 720                 { &hf_dsi_server_directory,
 721                   { "Directory service",         "dsi.server_directory",
 722                     FT_UINT_STRING, BASE_NONE, NULL, 0x0,
 723                     "Server directory service", HFILL }},
 724
 725                 { &hf_dsi_server_signature,
 726                   { "Server signature",         "dsi.server_signature",
 727                     FT_BYTES, BASE_NONE, NULL, 0x0,
 728                     NULL, HFILL }},
 729
 730                 { &hf_dsi_server_flag,
 731                   { "Flag",         "dsi.server_flag",
 732                     FT_UINT16, BASE_HEX, NULL, 0x0,
 733                     "Server capabilities flag", HFILL }},
 734                 { &hf_dsi_server_flag_copyfile,
 735                   { "Support copyfile",      "dsi.server_flag.copyfile",
 736                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_COPY,
 737                     "Server support copyfile", HFILL }},
 738                 { &hf_dsi_server_flag_passwd,
 739                   { "Support change password",      "dsi.server_flag.passwd",
 740                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_PASSWD,
 741                     "Server support change password", HFILL }},
 742                 { &hf_dsi_server_flag_no_save_passwd,
 743                   { "Don't allow save password",      "dsi.server_flag.no_save_passwd",
 744                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_NOSAVEPASSWD,
 745                     NULL, HFILL }},
 746                 { &hf_dsi_server_flag_srv_msg,
 747                   { "Support server message",      "dsi.server_flag.srv_msg",
 748                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_SRVMSGS,
 749                     NULL, HFILL }},
 750                 { &hf_dsi_server_flag_srv_sig,
 751                   { "Support server signature",      "dsi.server_flag.srv_sig",
 752                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_SRVSIGNATURE,
 753                     NULL, HFILL }},
 754                 { &hf_dsi_server_flag_tcpip,
 755                   { "Support TCP/IP",      "dsi.server_flag.tcpip",
 756                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_TCPIP,
 757                     "Server support TCP/IP", HFILL }},
 758                 { &hf_dsi_server_flag_notify,
 759                   { "Support server notifications",      "dsi.server_flag.notify",
 760                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_SRVNOTIFY,
 761                     "Server support notifications", HFILL }},
 762                 { &hf_dsi_server_flag_reconnect,
 763                   { "Support server reconnect",      "dsi.server_flag.reconnect",
 764                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_SRVRECONNECT,
 765                     "Server support reconnect", HFILL }},
 766                 { &hf_dsi_server_flag_directory,
 767                   { "Support directory services",      "dsi.server_flag.directory",
 768                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_SRVDIRECTORY,
 769                     "Server support directory services", HFILL }},
 770                 { &hf_dsi_server_flag_utf8_name,
 771                   { "Support UTF8 server name",      "dsi.server_flag.utf8_name",
 772                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_SRVUTF8,
 773                     "Server support UTF8 server name", HFILL }},
 774                 { &hf_dsi_server_flag_uuid,
 775                   { "Support UUIDs",      "dsi.server_flag.uuids",
 776                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_UUID,
 777                     "Server supports UUIDs", HFILL }},
 778                 { &hf_dsi_server_flag_ext_sleep,
 779                   { "Support extended sleep",      "dsi.server_flag.ext_sleep",
 780                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_EXT_SLEEP,
 781                     "Server supports extended sleep", HFILL }},
 782                 { &hf_dsi_server_flag_fast_copy,
 783                   { "Support fast copy",      "dsi.server_flag.fast_copy",
 784                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_FASTBOZO,
 785                     "Server support fast copy", HFILL }},
 786
 787
 788                 { &hf_dsi_server_addr_len,
 789                   { "Length",          "dsi.server_addr.len",
 790                     FT_UINT8, BASE_DEC, NULL, 0x0,
 791                     "Address length.", HFILL }},
 792
 793                 { &hf_dsi_server_addr_type,
 794                   { "Type",          "dsi.server_addr.type",
 795                     FT_UINT8, BASE_DEC|BASE_EXT_STRING, &afp_server_addr_type_vals_ext, 0x0,
 796                     "Address type.", HFILL }},
 797
 798                 { &hf_dsi_server_addr_value,
 799                   { "Value",          "dsi.server_addr.value",
 800                     FT_BYTES, BASE_NONE, NULL, 0x0,
 801                     "Address value", HFILL }},
 802
 803                 { &hf_dsi_open_type,
 804                   { "Option",          "dsi.open_type",
 805                     FT_UINT8, BASE_DEC, VALS(dsi_open_type_vals), 0x0,
 806                     "Open session option type.", HFILL }},
 807
 808                 { &hf_dsi_open_len,
 809                   { "Length",          "dsi.open_len",
 810                     FT_UINT8, BASE_DEC, NULL, 0x0,
 811                     "Open session option len", HFILL }},
 812
 813                 { &hf_dsi_open_quantum,
 814                   { "Quantum",       "dsi.open_quantum",
 815                     FT_UINT32, BASE_DEC, NULL, 0x0,
 816                     "Server/Attention quantum", HFILL }},
 817
 818                 { &hf_dsi_replay_cache_size,
 819                   { "Replay",       "dsi.replay_cache",
 820                     FT_UINT32, BASE_DEC, NULL, 0x0,
 821                     "Replay cache size", HFILL }},
 822
 823                 { &hf_dsi_open_option,
 824                   { "Option",          "dsi.open_option",
 825                     FT_BYTES, BASE_NONE, NULL, 0x0,
 826                     "Open session options (undecoded)", HFILL }},
 827
 828                 { &hf_dsi_attn_flag,
 829                   { "Flags",          "dsi.attn_flag",
 830                     FT_UINT16, BASE_HEX|BASE_EXT_STRING, &dsi_attn_flag_vals_ext, 0xf000,
 831                     "Server attention flag", HFILL }},
 832                 { &hf_dsi_attn_flag_shutdown,
 833                   { "Shutdown",      "dsi.attn_flag.shutdown",
 834                     FT_BOOLEAN, 16, NULL, 1<<15,
 835                     "Attention flag, server is shutting down", HFILL }},
 836                 { &hf_dsi_attn_flag_crash,
 837                   { "Crash",      "dsi.attn_flag.crash",
 838                     FT_BOOLEAN, 16, NULL, 1<<14,
 839                     "Attention flag, server crash bit", HFILL }},
 840                 { &hf_dsi_attn_flag_msg,
 841                   { "Message",      "dsi.attn_flag.msg",
 842                     FT_BOOLEAN, 16, NULL, 1<<13,
 843                     "Attention flag, server message bit", HFILL }},
 844                 { &hf_dsi_attn_flag_reconnect,
 845                   { "Don't reconnect",      "dsi.attn_flag.reconnect",
 846                     FT_BOOLEAN, 16, NULL, 1<<12,
 847                     "Attention flag, don't reconnect bit", HFILL }},
 848                 { &hf_dsi_attn_flag_time,
 849                   { "Minutes",          "dsi.attn_flag.time",
 850                     FT_UINT16, BASE_DEC, NULL, 0xfff,
 851                     "Number of minutes", HFILL }},
 852                 { &hf_dsi_attn_flag_bitmap,
 853                   { "Bitmap",          "dsi.attn_flag.bitmap",
 854                     FT_UINT16, BASE_HEX, NULL, 0xfff,
 855                     "Attention extended bitmap", HFILL }},
 856
 857         };
 858
 859         static gint *ett[] = {
 860                 &ett_dsi,
 861                 &ett_dsi_open,
 862                 &ett_dsi_attn,
 863                 &ett_dsi_attn_flag,
 864                 /* asp afp */
 865                 &ett_dsi_status,
 866                 &ett_dsi_status_server_flag,
 867                 &ett_dsi_vers,
 868                 &ett_dsi_uams,
 869                 &ett_dsi_addr,
 870                 &ett_dsi_addr_line,
 871                 &ett_dsi_directory,
 872                 &ett_dsi_utf8_name,
 873         };
 874         module_t *dsi_module;
 875
 876         proto_dsi = proto_register_protocol("Data Stream Interface", "DSI", "dsi");
 877         proto_register_field_array(proto_dsi, hf, array_length(hf));
 878         proto_register_subtree_array(ett, array_length(ett));
 879
 880         dsi_module = prefs_register_protocol(proto_dsi, NULL);
 881         prefs_register_bool_preference(dsi_module, "desegment",
 882                                        "Reassemble DSI messages spanning multiple TCP segments",
 883                                        "Whether the DSI dissector should reassemble messages spanning multiple TCP segments."
 884                                        " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
 885                                        &dsi_desegment);
 886 }
 887
 888 void
 889 proto_reg_handoff_dsi(void)
 890 {
 891         dissector_handle_t dsi_handle;
 892
 893         dsi_handle = create_dissector_handle(dissect_dsi, proto_dsi);
 894         dissector_add_uint("tcp.port", TCP_PORT_DSI, dsi_handle);
 895
 896         data_handle = find_dissector("data");
 897         afp_handle = find_dissector("afp");
 898 }