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  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * Copied from packet-pop.c
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <glib.h>
  29
  30 #include <epan/packet.h>
  31 #include <epan/to_str.h>
  32 #include <epan/prefs.h>
  33
  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 void proto_register_dsi(void);
  68 void proto_reg_handoff_dsi(void);
  69
  70 static int proto_dsi = -1;
  71 static int hf_dsi_flags = -1;
  72 static int hf_dsi_command = -1;
  73 static int hf_dsi_requestid = -1;
  74 static int hf_dsi_offset = -1;
  75 static int hf_dsi_error = -1;
  76 static int hf_dsi_length = -1;
  77 static int hf_dsi_reserved = -1;
  78
  79 static gint ett_dsi = -1;
  80
  81 static int hf_dsi_open_type     = -1;
  82 static int hf_dsi_open_len      = -1;
  83 static int hf_dsi_open_quantum  = -1;
  84 static int hf_dsi_replay_cache_size = -1;
  85 static int hf_dsi_open_option   = -1;
  86
  87 static int hf_dsi_attn_flag             = -1;
  88 static int hf_dsi_attn_flag_shutdown    = -1;
  89 static int hf_dsi_attn_flag_crash       = -1;
  90 static int hf_dsi_attn_flag_msg         = -1;
  91 static int hf_dsi_attn_flag_reconnect   = -1;
  92 static int hf_dsi_attn_flag_time        = -1;
  93 static int hf_dsi_attn_flag_bitmap      = -1;
  94
  95 static gint ett_dsi_open        = -1;
  96 static gint ett_dsi_attn        = -1;
  97 static gint ett_dsi_attn_flag   = -1;
  98
  99 static const value_string dsi_attn_flag_vals[] = {
 100         {0x0, "Reserved" },                                           /* 0000 */
 101         {0x1, "Reserved" },                                           /* 0001 */
 102         {0x2, "Server message" },                                     /* 0010 */
 103         {0x3, "Server notification, cf. extended bitmap" },           /* 0011 */
 104         {0x4, "Server is shutting down, internal error" },            /* 0100 */
 105         {0x8, "Server is shutting down" },                            /* 1000 */
 106         {0x9, "Server disconnects user" },                            /* 1001 */
 107         {0x10,"Server is shutting down, message" },                   /* 1010 */
 108         {0x11,"Server is shutting down, message,no reconnect"},       /* 1011 */
 109         {0,                   NULL } };
 110 static value_string_ext dsi_attn_flag_vals_ext = VALUE_STRING_EXT_INIT(dsi_attn_flag_vals);
 111
 112 static const value_string dsi_open_type_vals[] = {
 113         {0,   "Server quantum" },
 114         {1,   "Attention quantum" },
 115         {2,   "Replay cache size" },
 116         {0,                   NULL } };
 117
 118 /* status stuff same for asp and afp */
 119 static int hf_dsi_server_name = -1;
 120 static int hf_dsi_utf8_server_name_len = -1;
 121 static int hf_dsi_utf8_server_name = -1;
 122 static int hf_dsi_server_type = -1;
 123 static int hf_dsi_server_vers = -1;
 124 static int hf_dsi_server_uams = -1;
 125 static int hf_dsi_server_icon = -1;
 126 static int hf_dsi_server_directory = -1;
 127
 128 static int hf_dsi_server_flag = -1;
 129 static int hf_dsi_server_flag_copyfile = -1;
 130 static int hf_dsi_server_flag_passwd   = -1;
 131 static int hf_dsi_server_flag_no_save_passwd = -1;
 132 static int hf_dsi_server_flag_srv_msg   = -1;
 133 static int hf_dsi_server_flag_srv_sig   = -1;
 134 static int hf_dsi_server_flag_tcpip     = -1;
 135 static int hf_dsi_server_flag_notify    = -1;
 136 static int hf_dsi_server_flag_reconnect = -1;
 137 static int hf_dsi_server_flag_directory = -1;
 138 static int hf_dsi_server_flag_utf8_name = -1;
 139 static int hf_dsi_server_flag_uuid      = -1;
 140 static int hf_dsi_server_flag_ext_sleep = -1;
 141 static int hf_dsi_server_flag_fast_copy = -1;
 142 static int hf_dsi_server_signature      = -1;
 143
 144 static int hf_dsi_server_addr_len       = -1;
 145 static int hf_dsi_server_addr_type      = -1;
 146 static int hf_dsi_server_addr_value     = -1;
 147
 148 static gint ett_dsi_status = -1;
 149 static gint ett_dsi_uams   = -1;
 150 static gint ett_dsi_vers   = -1;
 151 static gint ett_dsi_addr   = -1;
 152 static gint ett_dsi_addr_line = -1;
 153 static gint ett_dsi_directory = -1;
 154 static gint ett_dsi_utf8_name = -1;
 155 static gint ett_dsi_status_server_flag = -1;
 156
 157 static const value_string afp_server_addr_type_vals[] = {
 158         {1,   "IP address" },
 159         {2,   "IP+port address" },
 160         {3,   "DDP address" },
 161         {4,   "DNS name" },
 162         {5,   "IP+port ssh tunnel" },
 163         {6,   "IP6 address" },
 164         {7,   "IP6+port address" },
 165         {0,   NULL } };
 166 value_string_ext afp_server_addr_type_vals_ext = VALUE_STRING_EXT_INIT(afp_server_addr_type_vals);
 167
 168 /* end status stuff */
 169
 170 /* desegmentation of DSI */
 171 static gboolean dsi_desegment = TRUE;
 172
 173 static dissector_handle_t data_handle;
 174 static dissector_handle_t afp_handle;
 175
 176 #define TCP_PORT_DSI      548
 177
 178 #define DSI_BLOCKSIZ       16
 179
 180 /* DSI flags */
 181 #define DSIFL_REQUEST    0x00
 182 #define DSIFL_REPLY      0x01
 183 #define DSIFL_MAX        0x01
 184
 185 /* DSI Commands */
 186 #define DSIFUNC_CLOSE   1       /* DSICloseSession */
 187 #define DSIFUNC_CMD     2       /* DSICommand */
 188 #define DSIFUNC_STAT    3       /* DSIGetStatus */
 189 #define DSIFUNC_OPEN    4       /* DSIOpenSession */
 190 #define DSIFUNC_TICKLE  5       /* DSITickle */
 191 #define DSIFUNC_WRITE   6       /* DSIWrite */
 192 #define DSIFUNC_ATTN    8       /* DSIAttention */
 193 #define DSIFUNC_MAX     8       /* largest command */
 194
 195 static const value_string flag_vals[] = {
 196         {DSIFL_REQUEST,       "Request" },
 197         {DSIFL_REPLY,         "Reply" },
 198         {0,                   NULL } };
 199
 200 static const value_string func_vals[] = {
 201         {DSIFUNC_CLOSE,       "CloseSession" },
 202         {DSIFUNC_CMD,         "Command" },
 203         {DSIFUNC_STAT,        "GetStatus" },
 204         {DSIFUNC_OPEN,        "OpenSession" },
 205         {DSIFUNC_TICKLE,      "Tickle" },
 206         {DSIFUNC_WRITE,       "Write" },
 207         { 7,                  "Unknown" },
 208         {DSIFUNC_ATTN,        "Attention" },
 209         {0,                   NULL } };
 210 static value_string_ext func_vals_ext = VALUE_STRING_EXT_INIT(func_vals);
 211
 212 static gint
 213 dissect_dsi_open_session(tvbuff_t *tvb, proto_tree *dsi_tree, gint offset, gint dsi_length)
 214 {
 215         proto_tree      *tree;
 216         proto_item      *ti;
 217         guint8          type;
 218         guint8          len;
 219
 220         ti = proto_tree_add_text(dsi_tree, tvb, offset, -1, "Open Session");
 221         tree = proto_item_add_subtree(ti, ett_dsi_open);
 222
 223         while( dsi_length >2 ) {
 224
 225                 type = tvb_get_guint8(tvb, offset);
 226                 proto_tree_add_item(tree, hf_dsi_open_type, tvb, offset, 1, ENC_BIG_ENDIAN);
 227                 offset++;
 228                 len = tvb_get_guint8(tvb, offset);
 229                 proto_tree_add_item(tree, hf_dsi_open_len, tvb, offset, 1, ENC_BIG_ENDIAN);
 230                 offset++;
 231                 switch (type) {
 232                         case 0:
 233                                 proto_tree_add_item(tree, hf_dsi_open_quantum, tvb, offset, 4, ENC_BIG_ENDIAN);
 234                                 break;
 235                         case 1:
 236                                 proto_tree_add_item(tree, hf_dsi_open_quantum, tvb, offset, 4, ENC_BIG_ENDIAN);
 237                                 break;
 238                         case 2:
 239                                 proto_tree_add_item(tree, hf_dsi_replay_cache_size, tvb, offset, 4, ENC_BIG_ENDIAN);
 240                                 break;
 241                         default:
 242                                 proto_tree_add_item(tree, hf_dsi_open_option, tvb, offset, len, ENC_NA);
 243                 }
 244
 245                 dsi_length -= len + 2;
 246
 247                 offset += len;
 248         }
 249         return offset;
 250 }
 251
 252 static gint
 253 dissect_dsi_attention(tvbuff_t *tvb, proto_tree *dsi_tree, gint offset)
 254 {
 255         proto_tree      *tree;
 256         proto_item      *ti;
 257         guint16         flag;
 258
 259         if (!tvb_reported_length_remaining(tvb,offset))
 260                 return offset;
 261
 262         flag = tvb_get_ntohs(tvb, offset);
 263         ti = proto_tree_add_text(dsi_tree, tvb, offset, -1, "Attention");
 264         tree = proto_item_add_subtree(ti, ett_dsi_attn);
 265
 266         ti = proto_tree_add_item(tree, hf_dsi_attn_flag, tvb, offset, 2, ENC_BIG_ENDIAN);
 267         tree = proto_item_add_subtree(ti, ett_dsi_attn_flag);
 268         proto_tree_add_item(tree, hf_dsi_attn_flag_shutdown, tvb, offset, 2, ENC_BIG_ENDIAN);
 269         proto_tree_add_item(tree, hf_dsi_attn_flag_crash, tvb, offset, 2, ENC_BIG_ENDIAN);
 270         proto_tree_add_item(tree, hf_dsi_attn_flag_msg, tvb, offset, 2, ENC_BIG_ENDIAN);
 271         proto_tree_add_item(tree, hf_dsi_attn_flag_reconnect, tvb, offset, 2, ENC_BIG_ENDIAN);
 272         /* FIXME */
 273         if ((flag & 0xf000) != 0x3000)
 274                 proto_tree_add_item(tree, hf_dsi_attn_flag_time, tvb, offset, 2, ENC_BIG_ENDIAN);
 275         else
 276                 proto_tree_add_item(tree, hf_dsi_attn_flag_bitmap, tvb, offset, 2, ENC_BIG_ENDIAN);
 277         offset += 2;
 278         return offset;
 279 }
 280
 281 /* -----------------------------
 282         from netatalk/etc/afpd/status.c
 283 */
 284 static gint
 285 dissect_dsi_reply_get_status(tvbuff_t *tvb, proto_tree *tree, gint offset)
 286 {
 287         proto_tree      *sub_tree;
 288         proto_item      *ti;
 289
 290         guint16 ofs;
 291         guint16 flag;
 292         guint16 sign_ofs = 0;
 293         guint16 adr_ofs = 0;
 294         guint16 dir_ofs = 0;
 295         guint16 utf_ofs = 0;
 296         guint8  nbe;
 297         guint8  len;
 298         guint8  i;
 299
 300         if (!tree)
 301                 return offset;
 302
 303         ti = proto_tree_add_text(tree, tvb, offset, -1, "Get Status");
 304         tree = proto_item_add_subtree(ti, ett_dsi_status);
 305
 306         ofs = tvb_get_ntohs(tvb, offset +AFPSTATUS_MACHOFF);
 307         proto_tree_add_text(tree, tvb, offset +AFPSTATUS_MACHOFF, 2, "Machine offset: %d", ofs);
 308
 309         ofs = tvb_get_ntohs(tvb, offset +AFPSTATUS_VERSOFF);
 310         proto_tree_add_text(tree, tvb, offset +AFPSTATUS_VERSOFF, 2, "Version offset: %d", ofs);
 311
 312         ofs = tvb_get_ntohs(tvb, offset +AFPSTATUS_UAMSOFF);
 313         proto_tree_add_text(tree, tvb, offset +AFPSTATUS_UAMSOFF, 2, "UAMS offset: %d", ofs);
 314
 315         ofs = tvb_get_ntohs(tvb, offset +AFPSTATUS_ICONOFF);
 316         proto_tree_add_text(tree, tvb, offset +AFPSTATUS_ICONOFF, 2, "Icon offset: %d", ofs);
 317
 318         ofs = offset +AFPSTATUS_FLAGOFF;
 319         ti = proto_tree_add_item(tree, hf_dsi_server_flag, tvb, ofs, 2, ENC_BIG_ENDIAN);
 320         sub_tree = proto_item_add_subtree(ti, ett_dsi_status_server_flag);
 321         proto_tree_add_item(sub_tree, hf_dsi_server_flag_copyfile      , tvb, ofs, 2, ENC_BIG_ENDIAN);
 322         proto_tree_add_item(sub_tree, hf_dsi_server_flag_passwd        , tvb, ofs, 2, ENC_BIG_ENDIAN);
 323         proto_tree_add_item(sub_tree, hf_dsi_server_flag_no_save_passwd, tvb, ofs, 2, ENC_BIG_ENDIAN);
 324         proto_tree_add_item(sub_tree, hf_dsi_server_flag_srv_msg       , tvb, ofs, 2, ENC_BIG_ENDIAN);
 325         proto_tree_add_item(sub_tree, hf_dsi_server_flag_srv_sig       , tvb, ofs, 2, ENC_BIG_ENDIAN);
 326         proto_tree_add_item(sub_tree, hf_dsi_server_flag_tcpip         , tvb, ofs, 2, ENC_BIG_ENDIAN);
 327         proto_tree_add_item(sub_tree, hf_dsi_server_flag_notify        , tvb, ofs, 2, ENC_BIG_ENDIAN);
 328         proto_tree_add_item(sub_tree, hf_dsi_server_flag_reconnect     , tvb, ofs, 2, ENC_BIG_ENDIAN);
 329         proto_tree_add_item(sub_tree, hf_dsi_server_flag_directory     , tvb, ofs, 2, ENC_BIG_ENDIAN);
 330         proto_tree_add_item(sub_tree, hf_dsi_server_flag_utf8_name     , tvb, ofs, 2, ENC_BIG_ENDIAN);
 331         proto_tree_add_item(sub_tree, hf_dsi_server_flag_uuid          , tvb, ofs, 2, ENC_BIG_ENDIAN);
 332         proto_tree_add_item(sub_tree, hf_dsi_server_flag_ext_sleep     , tvb, ofs, 2, ENC_BIG_ENDIAN);
 333         proto_tree_add_item(sub_tree, hf_dsi_server_flag_fast_copy     , tvb, ofs, 2, ENC_BIG_ENDIAN);
 334
 335         proto_tree_add_item(tree, hf_dsi_server_name, tvb, offset +AFPSTATUS_PRELEN, 1, ENC_ASCII|ENC_NA);
 336
 337         flag = tvb_get_ntohs(tvb, ofs);
 338         if ((flag & AFPSRVRINFO_SRVSIGNATURE)) {
 339                 ofs = offset +AFPSTATUS_PRELEN +tvb_get_guint8(tvb, offset +AFPSTATUS_PRELEN) +1;
 340                 if ((ofs & 1))
 341                         ofs++;
 342
 343                 sign_ofs = tvb_get_ntohs(tvb, ofs);
 344                 proto_tree_add_text(tree, tvb, ofs, 2, "Signature offset: %d", sign_ofs);
 345                 if (sign_ofs)
 346                         sign_ofs += offset;
 347
 348                 if ((flag & AFPSRVRINFO_TCPIP)) {
 349                         ofs += 2;
 350                         adr_ofs =  tvb_get_ntohs(tvb, ofs);
 351                         proto_tree_add_text(tree, tvb, ofs, 2, "Network address offset: %d", adr_ofs);
 352                         adr_ofs += offset;
 353                 }
 354
 355                 if ((flag & AFPSRVRINFO_SRVDIRECTORY)) {
 356                         ofs += 2;
 357                         dir_ofs =  tvb_get_ntohs(tvb, ofs);
 358                         proto_tree_add_text(tree, tvb, ofs, 2, "Directory services offset: %d", dir_ofs);
 359                         dir_ofs += offset;
 360                 }
 361                 if ((flag & AFPSRVRINFO_SRVUTF8)) {
 362                         ofs += 2;
 363                         utf_ofs =  tvb_get_ntohs(tvb, ofs);
 364                         proto_tree_add_text(tree, tvb, ofs, 2, "UTF-8 server name offset: %d", utf_ofs);
 365                         utf_ofs += offset;
 366                 }
 367         }
 368
 369         ofs = tvb_get_ntohs(tvb, offset +AFPSTATUS_MACHOFF);
 370         if (ofs) {
 371                 ofs += offset;
 372                 proto_tree_add_item(tree, hf_dsi_server_type, tvb, ofs, 1, ENC_ASCII|ENC_NA);
 373         }
 374
 375         ofs = tvb_get_ntohs(tvb, offset +AFPSTATUS_VERSOFF);
 376         if (ofs) {
 377                 ofs += offset;
 378                 nbe = tvb_get_guint8(tvb, ofs);
 379                 ti = proto_tree_add_text(tree, tvb, ofs, 1, "Version list: %d", nbe);
 380                 ofs++;
 381                 sub_tree = proto_item_add_subtree(ti, ett_dsi_vers);
 382                 for (i = 0; i < nbe; i++) {
 383                         len = tvb_get_guint8(tvb, ofs);
 384                         proto_tree_add_item(sub_tree, hf_dsi_server_vers, tvb, ofs, 1, ENC_ASCII|ENC_NA);
 385                         ofs += len + 1;
 386                 }
 387         }
 388
 389         ofs = tvb_get_ntohs(tvb, offset +AFPSTATUS_UAMSOFF);
 390         if (ofs) {
 391                 ofs += offset;
 392                 nbe = tvb_get_guint8(tvb, ofs);
 393                 ti = proto_tree_add_text(tree, tvb, ofs, 1, "UAMS list: %d", nbe);
 394                 ofs++;
 395                 sub_tree = proto_item_add_subtree(ti, ett_dsi_uams);
 396                 for (i = 0; i < nbe; i++) {
 397                         len = tvb_get_guint8(tvb, ofs);
 398                         proto_tree_add_item(sub_tree, hf_dsi_server_uams, tvb, ofs, 1, ENC_ASCII|ENC_NA);
 399                         ofs += len + 1;
 400                 }
 401         }
 402
 403         ofs = tvb_get_ntohs(tvb, offset +AFPSTATUS_ICONOFF);
 404         if (ofs) {
 405                 ofs += offset;
 406                 proto_tree_add_item(tree, hf_dsi_server_icon, tvb, ofs, 256, ENC_NA);
 407         }
 408
 409         if (sign_ofs) {
 410                 proto_tree_add_item(tree, hf_dsi_server_signature, tvb, sign_ofs, 16, ENC_NA);
 411         }
 412
 413         if (adr_ofs) {
 414                 proto_tree *adr_tree;
 415                 unsigned char *tmp;
 416                 guint16 net;
 417                 guint8  node;
 418                 guint16 port;
 419
 420                 ofs = adr_ofs;
 421                 nbe = tvb_get_guint8(tvb, ofs);
 422                 ti = proto_tree_add_text(tree, tvb, ofs, 1, "Address list: %d", nbe);
 423                 ofs++;
 424                 adr_tree = proto_item_add_subtree(ti, ett_dsi_addr);
 425                 for (i = 0; i < nbe; i++) {
 426                         guint8 type;
 427
 428                         len = tvb_get_guint8(tvb, ofs);
 429                         type =  tvb_get_guint8(tvb, ofs +1);
 430                         switch (type) {
 431                         case 1: /* IP */
 432                                 ti = proto_tree_add_text(adr_tree, tvb, ofs, len, "ip: %s", tvb_ip_to_str(tvb, ofs+2));
 433                                 break;
 434                         case 2: /* IP + port */
 435                                 port = tvb_get_ntohs(tvb, ofs+6);
 436                                 ti = proto_tree_add_text(adr_tree, tvb, ofs, len, "IP: %s:%d", tvb_ip_to_str(tvb, ofs+2), port);
 437                                 break;
 438                         case 3: /* DDP, atalk_addr_to_str want host order not network */
 439                                 net  = tvb_get_ntohs(tvb, ofs+2);
 440                                 node = tvb_get_guint8(tvb, ofs +4);
 441                                 port = tvb_get_guint8(tvb, ofs +5);
 442                                 ti = proto_tree_add_text(adr_tree, tvb, ofs, len, "DDP: %u.%u:%u",
 443                                         net, node, port);
 444                                 break;
 445                         case 4: /* DNS */
 446                         case 5: /* SSH tunnel */
 447                                 if (len > 2) {
 448                                         tmp = tvb_get_string(wmem_packet_scope(), tvb, ofs +2, len -2);
 449                                         ti = proto_tree_add_text(adr_tree, tvb, ofs, len, "%s: %s",
 450                                                                 (type==4)?"DNS":"IP (SSH tunnel)", tmp);
 451                                         break;
 452                                 }
 453                                 else {
 454                                         ti = proto_tree_add_text(adr_tree, tvb, ofs, len,"Malformed address type %d", type);
 455                                 }
 456                                 break;
 457                         case 6: /* IP6 */
 458                                 ti = proto_tree_add_text(adr_tree, tvb, ofs, len, "IPv6: %s",
 459                                                 tvb_ip6_to_str(tvb, ofs+2));
 460                                 break;
 461                         case 7: /* IP6 + 2bytes port */
 462                                 port = tvb_get_ntohs(tvb, ofs+ 2+INET6_ADDRLEN);
 463                                 ti = proto_tree_add_text(adr_tree, tvb, ofs, len, "IPv6: %s:%d",
 464                                                 tvb_ip6_to_str(tvb, ofs+2), port);
 465                                 break;
 466                         default:
 467                                 ti = proto_tree_add_text(adr_tree, tvb, ofs, len,"Unknown type : %d", type);
 468                                 break;
 469                         }
 470                         len -= 2;
 471                         sub_tree = proto_item_add_subtree(ti,ett_dsi_addr_line);
 472                         proto_tree_add_item(sub_tree, hf_dsi_server_addr_len, tvb, ofs, 1, ENC_BIG_ENDIAN);
 473                         ofs++;
 474                         proto_tree_add_item(sub_tree, hf_dsi_server_addr_type, tvb, ofs, 1, ENC_BIG_ENDIAN);
 475                         ofs++;
 476                         proto_tree_add_item(sub_tree, hf_dsi_server_addr_value,tvb, ofs, len, ENC_NA);
 477                         ofs += len;
 478                 }
 479         }
 480
 481         if (dir_ofs) {
 482                 ofs = dir_ofs;
 483                 nbe = tvb_get_guint8(tvb, ofs);
 484                 ti = proto_tree_add_text(tree, tvb, ofs, 1, "Directory services list: %d", nbe);
 485                 ofs++;
 486                 sub_tree = proto_item_add_subtree(ti, ett_dsi_directory);
 487                 for (i = 0; i < nbe; i++) {
 488                         len = tvb_get_guint8(tvb, ofs);
 489                         proto_tree_add_item(sub_tree, hf_dsi_server_directory, tvb, ofs, 1, ENC_ASCII|ENC_NA);
 490                         ofs += len + 1;
 491                 }
 492         }
 493         if (utf_ofs) {
 494                 guint16 ulen;
 495                 char *tmp;
 496
 497                 ofs = utf_ofs;
 498                 ulen = tvb_get_ntohs(tvb, ofs);
 499                 tmp = tvb_get_string(wmem_packet_scope(), tvb, ofs + 2, ulen);
 500                 ti = proto_tree_add_text(tree, tvb, ofs, ulen + 2, "UTF-8 server name: %s", tmp);
 501                 sub_tree = proto_item_add_subtree(ti, ett_dsi_utf8_name);
 502                 proto_tree_add_uint(sub_tree, hf_dsi_utf8_server_name_len, tvb, ofs, 2, ulen);
 503                 ofs += 2;
 504                 proto_tree_add_string(sub_tree, hf_dsi_utf8_server_name, tvb, ofs, ulen, tmp);
 505                 ofs += ulen;
 506         }
 507
 508         return ofs;
 509 }
 510
 511 static int
 512 dissect_dsi_packet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
 513 {
 514         proto_tree      *dsi_tree;
 515         proto_item      *ti;
 516         guint8          dsi_flags,dsi_command;
 517         guint16         dsi_requestid;
 518         gint32          dsi_code;
 519         guint32         dsi_length;
 520         guint32         dsi_reserved;
 521         struct          aspinfo aspinfo;
 522
 523
 524         col_set_str(pinfo->cinfo, COL_PROTOCOL, "DSI");
 525         col_clear(pinfo->cinfo, COL_INFO);
 526
 527         dsi_flags = tvb_get_guint8(tvb, 0);
 528         dsi_command = tvb_get_guint8(tvb, 1);
 529         dsi_requestid = tvb_get_ntohs(tvb, 2);
 530         dsi_code = tvb_get_ntohl(tvb, 4);
 531         dsi_length = tvb_get_ntohl(tvb, 8);
 532         dsi_reserved = tvb_get_ntohl(tvb, 12);
 533
 534         col_add_fstr(pinfo->cinfo, COL_INFO, "%s %s (%u)",
 535                         val_to_str(dsi_flags, flag_vals,
 536                                    "Unknown flag (0x%02x)"),
 537                         val_to_str_ext(dsi_command, &func_vals_ext,
 538                                    "Unknown function (0x%02x)"),
 539                         dsi_requestid);
 540
 541         ti = proto_tree_add_item(tree, proto_dsi, tvb, 0, -1, ENC_NA);
 542         dsi_tree = proto_item_add_subtree(ti, ett_dsi);
 543
 544         if (tree) {
 545                 proto_tree_add_uint(dsi_tree, hf_dsi_flags, tvb,
 546                         0, 1, dsi_flags);
 547                 proto_tree_add_uint(dsi_tree, hf_dsi_command, tvb,
 548                         1, 1, dsi_command);
 549                 proto_tree_add_uint(dsi_tree, hf_dsi_requestid, tvb,
 550                         2, 2, dsi_requestid);
 551                 switch (dsi_flags) {
 552
 553                 case DSIFL_REQUEST:
 554                         proto_tree_add_int(dsi_tree, hf_dsi_offset, tvb,
 555                                 4, 4, dsi_code);
 556                         break;
 557
 558                 case DSIFL_REPLY:
 559                         proto_tree_add_int(dsi_tree, hf_dsi_error, tvb,
 560                                 4, 4, dsi_code);
 561                         break;
 562                 }
 563                 proto_tree_add_uint_format_value(dsi_tree, hf_dsi_length, tvb,
 564                         8, 4, dsi_length,
 565                         "%u bytes", dsi_length);
 566                 proto_tree_add_uint(dsi_tree, hf_dsi_reserved, tvb,
 567                         12, 4, dsi_reserved);
 568         }
 569
 570         switch (dsi_command) {
 571         case DSIFUNC_OPEN:
 572                 if (tree) {
 573                         dissect_dsi_open_session(tvb, dsi_tree, DSI_BLOCKSIZ, dsi_length);
 574                 }
 575                 break;
 576         case DSIFUNC_ATTN:
 577                 if (tree) {
 578                         dissect_dsi_attention(tvb, dsi_tree, DSI_BLOCKSIZ);
 579                 }
 580                 break;
 581         case DSIFUNC_STAT:
 582                 if (tree && (dsi_flags == DSIFL_REPLY)) {
 583                         dissect_dsi_reply_get_status(tvb, dsi_tree, DSI_BLOCKSIZ);
 584                 }
 585                 break;
 586         case DSIFUNC_CMD:
 587         case DSIFUNC_WRITE:
 588                 {
 589                         tvbuff_t   *new_tvb;
 590                         int len = tvb_reported_length_remaining(tvb,DSI_BLOCKSIZ);
 591
 592                         aspinfo.reply = (dsi_flags == DSIFL_REPLY);
 593                         aspinfo.command = dsi_command;
 594                         aspinfo.seq = dsi_requestid;
 595                         aspinfo.code = dsi_code;
 596                         proto_item_set_len(dsi_tree, DSI_BLOCKSIZ);
 597
 598                         new_tvb = tvb_new_subset(tvb, DSI_BLOCKSIZ,-1,len);
 599                         call_dissector_with_data(afp_handle, new_tvb, pinfo, tree, &aspinfo);
 600                 }
 601                 break;
 602         default:
 603                 call_dissector(data_handle,
 604                                                 tvb_new_subset_remaining(tvb, DSI_BLOCKSIZ),
 605                                                 pinfo, dsi_tree);
 606                 break;
 607         }
 608
 609         return tvb_length(tvb);
 610 }
 611
 612 static guint
 613 get_dsi_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
 614 {
 615         guint32 plen;
 616         guint8  dsi_flags,dsi_command;
 617
 618         dsi_flags = tvb_get_guint8(tvb, offset);
 619         dsi_command = tvb_get_guint8(tvb, offset+ 1);
 620         if ( dsi_flags > DSIFL_MAX || !dsi_command || dsi_command > DSIFUNC_MAX)
 621         {
 622             /* it's not a known dsi pdu start sequence */
 623             return tvb_length_remaining(tvb, offset);
 624         }
 625
 626         /*
 627          * Get the length of the DSI packet.
 628          */
 629         plen = tvb_get_ntohl(tvb, offset+8);
 630
 631         /*
 632          * That length doesn't include the length of the header itself;
 633          * add that in.
 634          */
 635         return plen + 16;
 636 }
 637
 638 static int
 639 dissect_dsi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
 640 {
 641         tcp_dissect_pdus(tvb, pinfo, tree, dsi_desegment, 12,
 642             get_dsi_pdu_len, dissect_dsi_packet, data);
 643
 644         return tvb_length(tvb);
 645 }
 646
 647 void
 648 proto_register_dsi(void)
 649 {
 650
 651         static hf_register_info hf[] = {
 652                 { &hf_dsi_flags,
 653                   { "Flags",            "dsi.flags",
 654                     FT_UINT8, BASE_HEX, VALS(flag_vals), 0x0,
 655                     "Indicates request or reply.", HFILL }},
 656
 657                 { &hf_dsi_command,
 658                   { "Command",          "dsi.command",
 659                     FT_UINT8, BASE_DEC|BASE_EXT_STRING, &func_vals_ext, 0x0,
 660                     "Represents a DSI command.", HFILL }},
 661
 662                 { &hf_dsi_requestid,
 663                   { "Request ID",       "dsi.requestid",
 664                     FT_UINT16, BASE_DEC, NULL, 0x0,
 665                     "Keeps track of which request this is.  Replies must match a Request.  IDs must be generated in sequential order.", HFILL }},
 666
 667                 { &hf_dsi_offset,
 668                   { "Data offset",      "dsi.data_offset",
 669                     FT_INT32, BASE_DEC, NULL, 0x0,
 670                     NULL, HFILL }},
 671
 672                 { &hf_dsi_error,
 673                   { "Error code",       "dsi.error_code",
 674                     FT_INT32, BASE_DEC|BASE_EXT_STRING, &asp_error_vals_ext, 0x0,
 675                     NULL, HFILL }},
 676
 677                 { &hf_dsi_length,
 678                   { "Length",           "dsi.length",
 679                     FT_UINT32, BASE_DEC, NULL, 0x0,
 680                     "Total length of the data that follows the DSI header.", HFILL }},
 681
 682                 { &hf_dsi_reserved,
 683                   { "Reserved",         "dsi.reserved",
 684                     FT_UINT32, BASE_HEX, NULL, 0x0,
 685                     "Reserved for future use.  Should be set to zero.", HFILL }},
 686                 /* asp , afp */
 687                 { &hf_dsi_utf8_server_name_len,
 688                   { "UTF-8 server name length",          "dsi.utf8_server_name_len",
 689                     FT_UINT16, BASE_DEC, NULL, 0x0,
 690                     "UTF-8 server name length.", HFILL }},
 691                 { &hf_dsi_utf8_server_name,
 692                   { "UTF-8 server name",         "dsi.utf8_server_name",
 693                     FT_STRING, BASE_NONE, NULL, 0x0,
 694                     NULL, HFILL }},
 695
 696                 { &hf_dsi_server_name,
 697                   { "Server name",         "dsi.server_name",
 698                     FT_UINT_STRING, BASE_NONE, NULL, 0x0,
 699                     NULL, HFILL }},
 700
 701                 { &hf_dsi_server_type,
 702                   { "Server type",         "dsi.server_type",
 703                     FT_UINT_STRING, BASE_NONE, NULL, 0x0,
 704                     NULL, HFILL }},
 705
 706                 { &hf_dsi_server_vers,
 707                   { "AFP version",         "dsi.server_vers",
 708                     FT_UINT_STRING, BASE_NONE, NULL, 0x0,
 709                     NULL, HFILL }},
 710
 711                 { &hf_dsi_server_uams,
 712                   { "UAM",         "dsi.server_uams",
 713                     FT_UINT_STRING, BASE_NONE, NULL, 0x0,
 714                     NULL, HFILL }},
 715
 716                 { &hf_dsi_server_icon,
 717                   { "Icon bitmap",         "dsi.server_icon",
 718                     FT_BYTES, BASE_NONE, NULL, 0x0,
 719                     "Server icon bitmap", HFILL }},
 720
 721                 { &hf_dsi_server_directory,
 722                   { "Directory service",         "dsi.server_directory",
 723                     FT_UINT_STRING, BASE_NONE, NULL, 0x0,
 724                     "Server directory service", HFILL }},
 725
 726                 { &hf_dsi_server_signature,
 727                   { "Server signature",         "dsi.server_signature",
 728                     FT_BYTES, BASE_NONE, NULL, 0x0,
 729                     NULL, HFILL }},
 730
 731                 { &hf_dsi_server_flag,
 732                   { "Flag",         "dsi.server_flag",
 733                     FT_UINT16, BASE_HEX, NULL, 0x0,
 734                     "Server capabilities flag", HFILL }},
 735                 { &hf_dsi_server_flag_copyfile,
 736                   { "Support copyfile",      "dsi.server_flag.copyfile",
 737                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_COPY,
 738                     "Server support copyfile", HFILL }},
 739                 { &hf_dsi_server_flag_passwd,
 740                   { "Support change password",      "dsi.server_flag.passwd",
 741                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_PASSWD,
 742                     "Server support change password", HFILL }},
 743                 { &hf_dsi_server_flag_no_save_passwd,
 744                   { "Don't allow save password",      "dsi.server_flag.no_save_passwd",
 745                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_NOSAVEPASSWD,
 746                     NULL, HFILL }},
 747                 { &hf_dsi_server_flag_srv_msg,
 748                   { "Support server message",      "dsi.server_flag.srv_msg",
 749                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_SRVMSGS,
 750                     NULL, HFILL }},
 751                 { &hf_dsi_server_flag_srv_sig,
 752                   { "Support server signature",      "dsi.server_flag.srv_sig",
 753                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_SRVSIGNATURE,
 754                     NULL, HFILL }},
 755                 { &hf_dsi_server_flag_tcpip,
 756                   { "Support TCP/IP",      "dsi.server_flag.tcpip",
 757                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_TCPIP,
 758                     "Server supports TCP/IP", HFILL }},
 759                 { &hf_dsi_server_flag_notify,
 760                   { "Support server notifications",      "dsi.server_flag.notify",
 761                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_SRVNOTIFY,
 762                     "Server supports notifications", HFILL }},
 763                 { &hf_dsi_server_flag_reconnect,
 764                   { "Support server reconnect",      "dsi.server_flag.reconnect",
 765                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_SRVRECONNECT,
 766                     "Server supports reconnect", HFILL }},
 767                 { &hf_dsi_server_flag_directory,
 768                   { "Support directory services",      "dsi.server_flag.directory",
 769                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_SRVDIRECTORY,
 770                     "Server supports directory services", HFILL }},
 771                 { &hf_dsi_server_flag_utf8_name,
 772                   { "Support UTF-8 server name",      "dsi.server_flag.utf8_name",
 773                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_SRVUTF8,
 774                     "Server supports UTF-8 server name", HFILL }},
 775                 { &hf_dsi_server_flag_uuid,
 776                   { "Support UUIDs",      "dsi.server_flag.uuids",
 777                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_UUID,
 778                     "Server supports UUIDs", HFILL }},
 779                 { &hf_dsi_server_flag_ext_sleep,
 780                   { "Support extended sleep",      "dsi.server_flag.ext_sleep",
 781                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_EXT_SLEEP,
 782                     "Server supports extended sleep", HFILL }},
 783                 { &hf_dsi_server_flag_fast_copy,
 784                   { "Support fast copy",      "dsi.server_flag.fast_copy",
 785                     FT_BOOLEAN, 16, NULL, AFPSRVRINFO_FASTBOZO,
 786                     "Server supports fast copy", HFILL }},
 787
 788
 789                 { &hf_dsi_server_addr_len,
 790                   { "Length",          "dsi.server_addr.len",
 791                     FT_UINT8, BASE_DEC, NULL, 0x0,
 792                     "Address length.", HFILL }},
 793
 794                 { &hf_dsi_server_addr_type,
 795                   { "Type",          "dsi.server_addr.type",
 796                     FT_UINT8, BASE_DEC|BASE_EXT_STRING, &afp_server_addr_type_vals_ext, 0x0,
 797                     "Address type.", HFILL }},
 798
 799                 { &hf_dsi_server_addr_value,
 800                   { "Value",          "dsi.server_addr.value",
 801                     FT_BYTES, BASE_NONE, NULL, 0x0,
 802                     "Address value", HFILL }},
 803
 804                 { &hf_dsi_open_type,
 805                   { "Option",          "dsi.open_type",
 806                     FT_UINT8, BASE_DEC, VALS(dsi_open_type_vals), 0x0,
 807                     "Open session option type.", HFILL }},
 808
 809                 { &hf_dsi_open_len,
 810                   { "Length",          "dsi.open_len",
 811                     FT_UINT8, BASE_DEC, NULL, 0x0,
 812                     "Open session option len", HFILL }},
 813
 814                 { &hf_dsi_open_quantum,
 815                   { "Quantum",       "dsi.open_quantum",
 816                     FT_UINT32, BASE_DEC, NULL, 0x0,
 817                     "Server/Attention quantum", HFILL }},
 818
 819                 { &hf_dsi_replay_cache_size,
 820                   { "Replay",       "dsi.replay_cache",
 821                     FT_UINT32, BASE_DEC, NULL, 0x0,
 822                     "Replay cache size", HFILL }},
 823
 824                 { &hf_dsi_open_option,
 825                   { "Option",          "dsi.open_option",
 826                     FT_BYTES, BASE_NONE, NULL, 0x0,
 827                     "Open session options (undecoded)", HFILL }},
 828
 829                 { &hf_dsi_attn_flag,
 830                   { "Flags",          "dsi.attn_flag",
 831                     FT_UINT16, BASE_HEX|BASE_EXT_STRING, &dsi_attn_flag_vals_ext, 0xf000,
 832                     "Server attention flag", HFILL }},
 833                 { &hf_dsi_attn_flag_shutdown,
 834                   { "Shutdown",      "dsi.attn_flag.shutdown",
 835                     FT_BOOLEAN, 16, NULL, 1<<15,
 836                     "Attention flag, server is shutting down", HFILL }},
 837                 { &hf_dsi_attn_flag_crash,
 838                   { "Crash",      "dsi.attn_flag.crash",
 839                     FT_BOOLEAN, 16, NULL, 1<<14,
 840                     "Attention flag, server crash bit", HFILL }},
 841                 { &hf_dsi_attn_flag_msg,
 842                   { "Message",      "dsi.attn_flag.msg",
 843                     FT_BOOLEAN, 16, NULL, 1<<13,
 844                     "Attention flag, server message bit", HFILL }},
 845                 { &hf_dsi_attn_flag_reconnect,
 846                   { "Don't reconnect",      "dsi.attn_flag.reconnect",
 847                     FT_BOOLEAN, 16, NULL, 1<<12,
 848                     "Attention flag, don't reconnect bit", HFILL }},
 849                 { &hf_dsi_attn_flag_time,
 850                   { "Minutes",          "dsi.attn_flag.time",
 851                     FT_UINT16, BASE_DEC, NULL, 0xfff,
 852                     "Number of minutes", HFILL }},
 853                 { &hf_dsi_attn_flag_bitmap,
 854                   { "Bitmap",          "dsi.attn_flag.bitmap",
 855                     FT_UINT16, BASE_HEX, NULL, 0xfff,
 856                     "Attention extended bitmap", HFILL }},
 857
 858         };
 859
 860         static gint *ett[] = {
 861                 &ett_dsi,
 862                 &ett_dsi_open,
 863                 &ett_dsi_attn,
 864                 &ett_dsi_attn_flag,
 865                 /* asp afp */
 866                 &ett_dsi_status,
 867                 &ett_dsi_status_server_flag,
 868                 &ett_dsi_vers,
 869                 &ett_dsi_uams,
 870                 &ett_dsi_addr,
 871                 &ett_dsi_addr_line,
 872                 &ett_dsi_directory,
 873                 &ett_dsi_utf8_name,
 874         };
 875         module_t *dsi_module;
 876
 877         proto_dsi = proto_register_protocol("Data Stream Interface", "DSI", "dsi");
 878         proto_register_field_array(proto_dsi, hf, array_length(hf));
 879         proto_register_subtree_array(ett, array_length(ett));
 880
 881         dsi_module = prefs_register_protocol(proto_dsi, NULL);
 882         prefs_register_bool_preference(dsi_module, "desegment",
 883                                        "Reassemble DSI messages spanning multiple TCP segments",
 884                                        "Whether the DSI dissector should reassemble messages spanning multiple TCP segments."
 885                                        " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
 886                                        &dsi_desegment);
 887 }
 888
 889 void
 890 proto_reg_handoff_dsi(void)
 891 {
 892         dissector_handle_t dsi_handle;
 893
 894         dsi_handle = new_create_dissector_handle(dissect_dsi, proto_dsi);
 895         dissector_add_uint("tcp.port", TCP_PORT_DSI, dsi_handle);
 896
 897         data_handle = find_dissector("data");
 898         afp_handle = find_dissector("afp");
 899 }