packet-slimp3.c

   1 /* packet-slimp3.c
   2  * Routines for SliMP3 protocol dissection
   3  *
   4  * Ashok Narayanan <ashokn@cisco.com>
   5  *
   6  * Adds support for the data packet protocol for the SliMP3
   7  * See www.slimdevices.com for details.
   8  *
   9  * $Id: packet-slimp3.c,v 1.10 2003/02/27 05:54:31 guy Exp $
  10  *
  11  * Ethereal - Network traffic analyzer
  12  * By Gerald Combs <gerald@ethereal.com>
  13  * Copyright 1998 Gerald Combs
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  28  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 # include "config.h"
  32 #endif
  33
  34 #include <glib.h>
  35 #include <string.h>
  36 #include <epan/packet.h>
  37
  38 static int proto_slimp3 = -1;
  39 static int hf_slimp3_opcode = -1;
  40 static int hf_slimp3_ir = -1;
  41 static int hf_slimp3_display = -1;
  42 static int hf_slimp3_control = -1;
  43 static int hf_slimp3_hello = -1;
  44 static int hf_slimp3_i2c = -1;
  45 static int hf_slimp3_data_request = -1;
  46 static int hf_slimp3_data = -1;
  47 static int hf_slimp3_discover_request = -1;
  48 static int hf_slimp3_discover_response = -1;
  49 static int hf_slimp3_data_ack = -1;
  50
  51 static gint ett_slimp3 = -1;
  52
  53 static dissector_handle_t slimp3_handle;
  54
  55 #define UDP_PORT_SLIMP3_V1    1069
  56 #define UDP_PORT_SLIMP3_V2    3483
  57
  58 #define SLIMP3_IR       'i'
  59 #define SLIMP3_CONTROL  's'
  60 #define SLIMP3_HELLO    'h'
  61 #define SLIMP3_DATA     'm'
  62 #define SLIMP3_DATA_REQ 'r'
  63 #define SLIMP3_DISPLAY  'l'
  64 #define SLIMP3_I2C      '2'
  65 #define SLIMP3_DISC_REQ 'd'
  66 #define SLIMP3_DISC_RSP 'D'
  67 #define SLIMP3_DATA_ACK 'a'
  68
  69 static const value_string slimp3_opcode_vals[] = {
  70   { SLIMP3_IR,       "Infrared Remote Code" },
  71   { SLIMP3_CONTROL,  "Stream Control" },
  72   { SLIMP3_DATA,     "MPEG Data" },
  73   { SLIMP3_DATA_REQ, "Data Request" },
  74   { SLIMP3_HELLO,    "Hello" },
  75   { SLIMP3_DISPLAY,  "Display" },
  76   { SLIMP3_I2C,      "I2C" },
  77   { SLIMP3_DISC_REQ, "Discovery Request" },
  78   { SLIMP3_DISC_RSP, "Discovery Response" },
  79   { SLIMP3_DATA_ACK, "Ack" },
  80   { 0,               NULL }
  81 };
  82
  83 /* IR remote control types */
  84 static const value_string slimp3_ir_types[] = {
  85     { 0x02, "SLIMP3" },
  86     { 0xff, "JVC DVD Player" },
  87
  88     { 0, NULL }
  89 };
  90
  91 /* IR codes for the custom SLIMP3 remote control */
  92 static const value_string slimp3_ir_codes_slimp3[] = {
  93     { 0x76899867, "0" },
  94     { 0x7689f00f, "1" },
  95     { 0x768908f7, "2" },
  96     { 0x76898877, "3" },
  97     { 0x768948b7, "4" },
  98     { 0x7689c837, "5" },
  99     { 0x768928d7, "6" },
 100     { 0x7689a857, "7" },
 101     { 0x76896897, "8" },
 102     { 0x7689e817, "9" },
 103     { 0x7689b04f, "arrow_down" },
 104     { 0x7689906f, "arrow_left" },
 105     { 0x7689d02f, "arrow_right" },
 106     { 0x7689e01f, "arrow_up" },
 107     { 0x768900ff, "voldown" },
 108     { 0x7689807f, "volup" },
 109     { 0x768940bf, "power" },
 110     { 0x7689c03f, "rew" },
 111     { 0x768920df, "pause" },
 112     { 0x7689a05f, "fwd" },
 113     { 0x7689609f, "add" },
 114     { 0x768910ef, "play" },
 115     { 0x768958a7, "search" },
 116     { 0x7689d827, "shuffle" },
 117     { 0x768938c7, "repeat" },
 118     { 0x7689b847, "sleep" },
 119     { 0x76897887, "now_playing" },
 120     { 0x7689f807, "size" },
 121     { 0x768904fb, "brightness" },
 122
 123     { 0,      NULL }
 124 };
 125
 126 /* IR codes for the JVC remote control */
 127 static const value_string slimp3_ir_codes_jvc[] = {
 128     { 0xf786, "One" },
 129     { 0xf746, "Two" },
 130     { 0xf7c6, "Three" },
 131     { 0xf726, "Four" },
 132     { 0xf7a6, "Five" },
 133     { 0xf766, "Six" },
 134     { 0xf7e6, "Seven" },
 135     { 0xf716, "Eight" },
 136     { 0xf796, "Nine" },
 137     { 0xf776, "Ten" },
 138
 139     { 0xf7f6, "Picture-In-Picture" },
 140     /* { 0xf7XX, "Enter" }, */
 141     { 0xf70e, "Back" },
 142     { 0xf732, "Play" },
 143     { 0xf76e, "Forward" },
 144     { 0xf743, "Record" },
 145     { 0xf7c2, "Stop" },
 146     { 0xf7b2, "Pause" },
 147     /* { 0xf7XX, "TV/Video" }, */
 148     { 0xf703, "Display" },
 149     { 0xf7b3, "Sleep" },
 150     { 0xf7b6, "Guide" },
 151     { 0xf70b, "Up" },
 152     { 0xf74b, "Left" },
 153     { 0xf7cb, "Right" },
 154     { 0xf78b, "Down" },
 155     { 0xf783, "Menu" },
 156     { 0xf72b, "OK" },
 157     { 0xf778, "Volume Up" },
 158     { 0xf7f8, "Volume Down" },
 159     { 0xf70d, "Channel Up" },
 160     { 0xf78d, "Channel Down" },
 161     /* { 0xf7XX, "Mute" },  */
 162     { 0xf7ab, "Recall" },
 163     { 0xf702, "Power" },
 164
 165     { 0,      NULL }
 166 };
 167
 168
 169 static const value_string slimp3_display_commands[] = {
 170     {  0x1, "Clear Display"},
 171     {  0x2, "Cursor to 1st Line Home"},
 172
 173     {  0x4, "Mode: Decrement Address, Shift Cursor"},
 174     {  0x5, "Mode: Decrement Address, Shift Display"},
 175     {  0x6, "Mode: Increment Address, Shift Cursor"},
 176     {  0x7, "Mode: Increment Address, Shift Display"},
 177
 178     {  0x8, "Display Off"},
 179     {  0xd, "Display On, With Blinking"},
 180     {  0xe, "Display On, With Cursor"},
 181     {  0xf, "Display On, With Cursor And Blinking"},
 182
 183     { 0x10, "Move Cursor Left"},
 184     { 0x14, "Move Cursor Right"},
 185     { 0x18, "Shift Display Left"},
 186     { 0x1b, "Shift Display Right"},
 187
 188     { 0x30, "Set (8-bit)"},
 189     { 0x20, "Set (4-bit)"},
 190
 191     { 0xa0, "Cursor to Top Right"},
 192     { 0xc0, "Cursor to 2nd Line Home"},
 193
 194     {    0, NULL},
 195 };
 196
 197 static const value_string slimp3_display_fset8[] = {
 198     { 0x0, "Brightness 100%"},
 199     { 0x1, "Brightness 75%"},
 200     { 0x2, "Brightness 50%"},
 201     { 0x3, "Brightness 25%"},
 202
 203     {   0, NULL },
 204 };
 205
 206 static const value_string slimp3_stream_control[] = {
 207     { 1, "Reset buffer, Start New Stream"},
 208     { 2, "Pause Playback"},
 209     { 4, "Resume Playback"},
 210     {   0, NULL },
 211 };
 212
 213
 214 static const value_string slimp3_mpg_control[] = {
 215     { 0, "Go"},           /* Run the decoder */
 216     { 1, "Stop"},         /* Halt decoder but don't reset rptr */
 217     { 3, "Reset"},        /* Halt decoder and reset rptr */
 218
 219     { 0, NULL }
 220 };
 221
 222 static void
 223 dissect_slimp3(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 224 {
 225     proto_tree  *slimp3_tree = NULL;
 226     proto_item  *ti = NULL;
 227     gint                i1;
 228     gint                offset = 0;
 229     guint16             opcode;
 230     char addc_str[101];
 231     char *addc_strp;
 232     int                 to_server = FALSE;
 233     int                 old_protocol = FALSE;
 234     address             tmp_addr;
 235
 236     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 237         col_set_str(pinfo->cinfo, COL_PROTOCOL, "SliMP3");
 238
 239     opcode = tvb_get_guint8(tvb, offset);
 240
 241     if (check_col(pinfo->cinfo, COL_INFO)) {
 242
 243         col_add_fstr(pinfo->cinfo, COL_INFO, "%s",
 244                      val_to_str(opcode, slimp3_opcode_vals, "Unknown (%c)"));
 245
 246     }
 247
 248     addc_strp = addc_str;
 249     if (tree) {
 250
 251         ti = proto_tree_add_item(tree, proto_slimp3, tvb, offset, -1, FALSE);
 252         slimp3_tree = proto_item_add_subtree(ti, ett_slimp3);
 253
 254         proto_tree_add_uint(slimp3_tree, hf_slimp3_opcode, tvb,
 255                             offset, 1, opcode);
 256     }
 257
 258     /* The new protocol (v1.3 and later) uses an IANA-assigned port number.
 259     * It usually uses the same number for both sizes of the conversation, so
 260     * the port numbers can't always be used to determine client and server.
 261     * The new protocol places the clients MAC address in the packet, so that
 262     * is used to identify packets originating at the client.
 263     */
 264     if ((pinfo->destport == UDP_PORT_SLIMP3_V2) && (pinfo->srcport == UDP_PORT_SLIMP3_V2)) {
 265         SET_ADDRESS(&tmp_addr, AT_ETHER, 6, tvb_get_ptr(tvb, offset+12, 6));
 266         to_server = ADDRESSES_EQUAL(&tmp_addr, &pinfo->dl_src);
 267     }
 268     else if (pinfo->destport == UDP_PORT_SLIMP3_V2) {
 269         to_server = TRUE;
 270     }
 271     else if (pinfo->srcport == UDP_PORT_SLIMP3_V2) {
 272         to_server = FALSE;
 273     }
 274     if (pinfo->destport == UDP_PORT_SLIMP3_V1) {
 275         to_server = TRUE;
 276         old_protocol = TRUE;
 277     }
 278     else if (pinfo->srcport == UDP_PORT_SLIMP3_V1) {
 279         to_server = FALSE;
 280         old_protocol = TRUE;
 281     }
 282
 283     switch (opcode) {
 284
 285     case SLIMP3_IR:
 286         /* IR code
 287         *
 288         * [0]        'i' as in "IR"
 289         * [1]        0x00
 290         * [2..5]     player's time since startup in ticks @625 KHz
 291         * [6]        IR code id, ff=JVC, 02=SLIMP3
 292         * [7]        number of meaningful bits - 16 for JVC, 32 for SLIMP3
 293         * [8..11]    the 32-bit IR code
 294         * [12..17]   reserved
 295         */
 296         if (tree) {
 297             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_ir, tvb, offset+8, 4, FALSE);
 298
 299             i1 = tvb_get_ntohl(tvb, offset+2);
 300             proto_tree_add_text(slimp3_tree, tvb, offset+2, 4, "Uptime: %u sec (%u ticks)",
 301                                 i1/625000, i1);
 302             i1 = tvb_get_guint8(tvb, offset+6);
 303             proto_tree_add_text(slimp3_tree, tvb, offset+6, 1, "Code identifier: 0x%0x: %s",
 304                                 i1, val_to_str(i1, slimp3_ir_types, "Unknown"));
 305             proto_tree_add_text(slimp3_tree, tvb, offset+7, 1, "Code bits: %d",
 306                                 tvb_get_guint8(tvb, offset+7));
 307
 308             i1 = tvb_get_ntohl(tvb, offset+8);
 309             /* Check the code to figure out which remote is being used. */
 310             if (tvb_get_guint8(tvb, offset+6) == 0x02 &&
 311                 tvb_get_guint8(tvb, offset+7) == 32) {
 312                 /* This is the custom SLIMP3 remote. */
 313                 proto_tree_add_text(slimp3_tree, tvb, offset+8, 4,
 314                                     "Infrared Code: %s: 0x%0x",
 315                                     val_to_str(i1, slimp3_ir_codes_slimp3, "Unknown"), i1);
 316             }
 317             else if (tvb_get_guint8(tvb, offset+6) == 0xff &&
 318                      tvb_get_guint8(tvb, offset+7) == 16) {
 319                 /* This is a JVC DVD player remote */
 320                 proto_tree_add_text(slimp3_tree, tvb, offset+8, 4,
 321                                     "Infrared Code: %s: 0x%0x",
 322                                     val_to_str(i1, slimp3_ir_codes_jvc, "Unknown"), i1);
 323             } else {
 324                 /* Unknown code; just write it */
 325                 proto_tree_add_text(slimp3_tree, tvb, offset+8, 4, "Infrared Code: 0x%0x", i1);
 326             }
 327         }
 328         if (check_col(pinfo->cinfo, COL_INFO)) {
 329             i1 = tvb_get_ntohl(tvb, offset+8);
 330             if (tvb_get_guint8(tvb, offset+6) == 0x02 &&
 331                 tvb_get_guint8(tvb, offset+7) == 32) {
 332                 col_append_fstr(pinfo->cinfo, COL_INFO, ", SLIMP3: %s",
 333                                 val_to_str(i1, slimp3_ir_codes_slimp3, "Unknown (0x%0x)"));
 334             }
 335             else if (tvb_get_guint8(tvb, offset+6) == 0xff &&
 336                      tvb_get_guint8(tvb, offset+7) == 16) {
 337                 col_append_fstr(pinfo->cinfo, COL_INFO, ", JVC: %s",
 338                                 val_to_str(i1, slimp3_ir_codes_jvc, "Unknown (0x%0x)"));
 339             } else {
 340                 /* Unknown code; just write it */
 341                 col_append_fstr(pinfo->cinfo, COL_INFO, ", 0x%0x", i1);
 342             }
 343         }
 344         break;
 345
 346     case SLIMP3_DISPLAY:
 347         if (tree) {
 348             gboolean in_str;
 349             int str_len;
 350
 351             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_display,
 352                                        tvb, offset, 1, FALSE);
 353
 354             /* Loop through the commands */
 355             i1 = 18;
 356             in_str = FALSE;
 357             str_len = 0;
 358             while (i1 < tvb_reported_length_remaining(tvb, offset)) {
 359                 switch(tvb_get_guint8(tvb, offset + i1)) {
 360                 case 0:
 361                     in_str = FALSE;
 362                     str_len = 0;
 363                     proto_tree_add_text(slimp3_tree, tvb, offset + i1, 2,
 364                                         "Delay (%d ms)", tvb_get_guint8(tvb, offset + i1 + 1));
 365                     i1 += 2;
 366                     break;
 367                 case 3:
 368                     if (ti && in_str) {
 369                         str_len += 2;
 370                         proto_item_append_text(ti, "%c",
 371                                                tvb_get_guint8(tvb, offset + i1 + 1));
 372                         proto_item_set_len(ti, str_len);
 373                     } else {
 374                         ti = proto_tree_add_text(slimp3_tree, tvb, offset + i1, 2,
 375                                                  "String: %c",
 376                                                  tvb_get_guint8(tvb, offset + i1 + 1));
 377                         in_str = TRUE;
 378                         str_len = 2;
 379                     }
 380                     i1 += 2;
 381                     break;
 382
 383                 case 2:
 384                     in_str = FALSE;
 385                     str_len = 0;
 386                     ti = proto_tree_add_text(slimp3_tree, tvb, offset + i1, 2,
 387                                              "Command: %s",
 388                                              val_to_str(tvb_get_guint8(tvb, offset + i1 + 1),
 389                                                         slimp3_display_commands,
 390                                                         "Unknown (0x%0x)"));
 391                     if ((tvb_get_guint8(tvb, offset + i1 + 1) & 0xf0) == 0x30) {
 392                         proto_item_append_text(ti, ": %s",
 393                                                val_to_str(tvb_get_guint8(tvb, offset + i1 + 2),
 394                                                           slimp3_display_fset8,
 395                                                           "Unknown (0x%0x)"));
 396                         i1 += 2;
 397                     }
 398                     i1 += 2;
 399                     break;
 400
 401                 default:
 402                     proto_tree_add_text(slimp3_tree, tvb, offset + i1, 2,
 403                                         "Unknown 0x%0x, 0x%0x",
 404                                         tvb_get_guint8(tvb, offset + i1),
 405                                         tvb_get_guint8(tvb, offset + i1 + 1));
 406                     i1 += 2;
 407                     break;
 408                 }
 409             }
 410         }
 411
 412         if (check_col(pinfo->cinfo, COL_INFO)) {
 413             i1 = 18;
 414             addc_strp = addc_str;
 415             while (tvb_offset_exists(tvb, offset + i1)) {
 416                 switch (tvb_get_guint8(tvb, offset + i1)) {
 417
 418                 case 0:
 419                     *addc_strp++ = '.';
 420                     break;
 421
 422                 case 2:
 423                     *addc_strp++ = '|';
 424                     if (tvb_offset_exists(tvb, offset + i1 + 1) &&
 425                           (tvb_get_guint8(tvb, offset + i1 + 1) & 0xf0) == 0x30)
 426                         i1 += 2;
 427                     break;
 428
 429                 case 3:
 430                     if (tvb_offset_exists(tvb, offset + i1 + 1)) {
 431                         if (addc_strp == addc_str ||
 432                               *(addc_strp-1) != ' ' ||
 433                               tvb_get_guint8(tvb, offset + i1 + 1) != ' ')
 434                             *addc_strp++ = tvb_get_guint8(tvb, offset + i1 + 1);
 435                     }
 436                 }
 437                 i1 += 2;
 438             }
 439             *addc_strp = 0;
 440             if (addc_strp - addc_str > 0)
 441                 col_append_fstr(pinfo->cinfo, COL_INFO, ", %s", addc_str);
 442         }
 443
 444         break;
 445
 446     case SLIMP3_CONTROL:
 447         if (tree) {
 448             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_control,
 449                                        tvb, offset+1, 1, FALSE);
 450             proto_tree_add_text(slimp3_tree, tvb, offset+1, 1, "Command: %s",
 451                                 val_to_str(tvb_get_guint8(tvb, offset+1),
 452                                            slimp3_stream_control, "Unknown (0x%0x)"));
 453         }
 454
 455         if (check_col(pinfo->cinfo, COL_INFO)) {
 456             col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
 457                             val_to_str(tvb_get_guint8(tvb, offset+1),
 458                                        slimp3_stream_control, "Unknown (0x%0x)"));
 459         }
 460         break;
 461
 462     case SLIMP3_HELLO:
 463         if (tree) {
 464             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_hello,
 465                                        tvb, offset+1, 1, FALSE);
 466             if (to_server) {
 467                 guint8 fw_ver = 0;
 468                 /* Hello response; client->server */
 469                 proto_tree_add_text(slimp3_tree, tvb, offset, 1, "Hello Response (Client --> Server)");
 470                 proto_tree_add_text(slimp3_tree, tvb, offset+1, 1, "Device ID: %d",
 471                                     tvb_get_guint8(tvb, offset+1));
 472                 fw_ver = tvb_get_guint8(tvb, offset+2);
 473                 proto_tree_add_text(slimp3_tree, tvb, offset+2, 1, "Firmware Revision: %d.%d (0x%0x)",
 474                                     fw_ver>>4, fw_ver & 0xf, fw_ver);
 475             } else {
 476                 /* Hello request; server->client */
 477                 proto_tree_add_text(slimp3_tree, tvb, offset, 1, "Hello Request (Server --> Client)");
 478             }
 479         }
 480         break;
 481
 482     case SLIMP3_I2C:
 483         if (tree) {
 484             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_i2c,
 485                                        tvb, offset, 1, FALSE);
 486             if (to_server) {
 487                 /* Hello response; client->server */
 488                 proto_tree_add_text(slimp3_tree, tvb, offset, -1,
 489                                     "I2C Response (Client --> Server)");
 490             } else {
 491                 /* Hello request; server->client */
 492                 proto_tree_add_text(slimp3_tree, tvb, offset, -1,
 493                                     "I2C Request (Server --> Client)");
 494             }
 495         }
 496
 497         if (check_col(pinfo->cinfo, COL_INFO)) {
 498             if (to_server) {
 499                 col_append_fstr(pinfo->cinfo, COL_INFO, ", Response");
 500             } else {
 501                 col_append_fstr(pinfo->cinfo, COL_INFO, ", Request");
 502             }
 503         }
 504         break;
 505
 506     case SLIMP3_DATA_REQ:
 507         if (tree) {
 508             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_data_request,
 509                                        tvb, offset, 1, FALSE);
 510             proto_tree_add_text(slimp3_tree, tvb, offset+2, 2,
 511                                 "Requested offset: %d bytes.",
 512                                 tvb_get_ntohs(tvb, offset+2)*2);
 513         }
 514
 515         if (check_col(pinfo->cinfo, COL_INFO)) {
 516             col_append_fstr(pinfo->cinfo, COL_INFO, ", Offset: %d bytes",
 517                             tvb_get_ntohs(tvb, offset+2)*2);
 518         }
 519         break;
 520
 521     case SLIMP3_DATA:
 522         /* MPEG data (v1.3 and later)
 523         *
 524         *  [0]       'm'
 525         *  [1..5]    reserved
 526         *  [6..7]    Write pointer (in words)
 527         *  [8..9]    reserved
 528         *  [10..11]  Sequence number
 529         *  [12..17]  reserved
 530         *  [18..]    MPEG data
 531         */
 532         if (tree) {
 533             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_data,
 534                                        tvb, offset, 1, FALSE);
 535             if (old_protocol) {
 536                 proto_tree_add_text(slimp3_tree, tvb, offset, -1,
 537                                     "Length: %d bytes",
 538                                     tvb_reported_length_remaining(tvb, offset+18));
 539                 proto_tree_add_text(slimp3_tree, tvb, offset+2, 2,
 540                                     "Buffer offset: %d bytes.",
 541                                     tvb_get_ntohs(tvb, offset+2) * 2);
 542             }
 543             else {
 544                 proto_tree_add_text(slimp3_tree, tvb, offset+1, 1, "Command: %s",
 545                                     val_to_str(tvb_get_guint8(tvb, offset+1),
 546                                                slimp3_mpg_control, "Unknown (0x%0x)"));
 547                 proto_tree_add_text(slimp3_tree, tvb, offset, -1,
 548                                     "Length: %d bytes",
 549                                     tvb_reported_length_remaining(tvb, offset+18));
 550                 proto_tree_add_text(slimp3_tree, tvb, offset+6, 2,
 551                                     "Write Pointer: %d",
 552                                     tvb_get_ntohs(tvb, offset+6) * 2);
 553                 proto_tree_add_text(slimp3_tree, tvb, offset+10, 2,
 554                                     "Sequence: %d",
 555                                     tvb_get_ntohs(tvb, offset+10));
 556             }
 557         }
 558
 559         if (check_col(pinfo->cinfo, COL_INFO)) {
 560             if (old_protocol) {
 561                 col_append_fstr(pinfo->cinfo, COL_INFO,
 562                                 ", Length: %d bytes, Offset: %d bytes.",
 563                                 tvb_reported_length_remaining(tvb, offset+18),
 564                                 tvb_get_ntohs(tvb, offset+2) * 2);
 565             }
 566             else {
 567                 col_append_fstr(pinfo->cinfo, COL_INFO,
 568                                 ", %s, %d bytes at %d, Sequence: %d",
 569                                 val_to_str(tvb_get_guint8(tvb, offset+1),
 570                                            slimp3_mpg_control, "Unknown (0x%0x)"),
 571                                 tvb_reported_length_remaining(tvb, offset+18),
 572                                 tvb_get_ntohs(tvb, offset+6) * 2,
 573                                 tvb_get_ntohs(tvb, offset+10));
 574             }
 575         }
 576         break;
 577
 578     case SLIMP3_DISC_REQ:
 579         if (tree) {
 580             guint8 fw_ver;
 581             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_discover_request,
 582                                        tvb, offset, 1, FALSE);
 583             proto_tree_add_text(slimp3_tree, tvb, offset+1, 1,
 584                                 "Device ID: %d.", tvb_get_guint8(tvb, offset+1));
 585             fw_ver = tvb_get_guint8(tvb, offset+2);
 586             proto_tree_add_text(slimp3_tree, tvb, offset+2, 1, "Firmware Revision: %d.%d (0x%0x)",
 587                                 fw_ver>>4, fw_ver & 0xf, fw_ver);
 588         }
 589
 590         if (check_col(pinfo->cinfo, COL_INFO)) {
 591             guint8 fw_ver = tvb_get_guint8(tvb, offset+2);
 592             col_append_fstr(pinfo->cinfo, COL_INFO, ", Device ID: %d. Firmware: %d.%d",
 593                             tvb_get_guint8(tvb, offset+1), fw_ver>>4, fw_ver & 0xf);
 594         }
 595         break;
 596
 597     case SLIMP3_DISC_RSP:
 598         if (tree) {
 599             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_discover_response,
 600                                        tvb, offset, 1, FALSE);
 601             proto_tree_add_text(slimp3_tree, tvb, offset+2, 4,
 602                                 "Server Address: %s.",
 603                                 ip_to_str(tvb_get_ptr(tvb, offset+2, 4)));
 604             proto_tree_add_text(slimp3_tree, tvb, offset+6, 2,
 605                                 "Server Port: %d", tvb_get_ntohs(tvb, offset + 6));
 606         }
 607
 608         if (check_col(pinfo->cinfo, COL_INFO)) {
 609             col_append_fstr(pinfo->cinfo, COL_INFO, ", Server Address: %s. Server Port: %d",
 610                             ip_to_str(tvb_get_ptr(tvb, offset+2, 4)),
 611                             tvb_get_ntohs(tvb, offset + 6));
 612         }
 613         break;
 614
 615     case SLIMP3_DATA_ACK:
 616         /* Acknowledge MPEG data
 617         *
 618         *  [0]       'a'
 619         *  [1..5]
 620         *  [6..7]    Write pointer (in words)
 621         *  [8..9]    Read pointer (in words)
 622         *  [10..11]  Sequence number
 623         *  [12..17]  client MAC address (v1.3 and later)
 624         */
 625         if (tree) {
 626             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_data_ack,
 627                                        tvb, offset, 1, FALSE);
 628             proto_tree_add_text(slimp3_tree, tvb, offset+6, 2,
 629                                 "Write Pointer: %d",
 630                                 tvb_get_ntohs(tvb, offset+6) * 2);
 631             proto_tree_add_text(slimp3_tree, tvb, offset+8, 2,
 632                                 "Read Pointer: %d",
 633                                 tvb_get_ntohs(tvb, offset+8) * 2);
 634             proto_tree_add_text(slimp3_tree, tvb, offset+10, 2,
 635                                 "Sequence: %d",
 636                                 tvb_get_ntohs(tvb, offset+10));
 637         }
 638         if (check_col(pinfo->cinfo, COL_INFO)) {
 639             col_append_fstr(pinfo->cinfo, COL_INFO, ", Sequence: %d",
 640                             tvb_get_ntohs(tvb, offset+10));
 641         }
 642         break;
 643
 644     default:
 645         if (tree) {
 646             proto_tree_add_text(slimp3_tree, tvb, offset, -1,
 647                                 "Data (%d bytes)", tvb_reported_length_remaining(tvb, offset));
 648         }
 649         break;
 650
 651     }
 652 }
 653
 654 void
 655 proto_register_slimp3(void)
 656 {
 657   static hf_register_info hf[] = {
 658     { &hf_slimp3_opcode,
 659       { "Opcode",             "slimp3.opcode",
 660         FT_UINT8, BASE_DEC, VALS(slimp3_opcode_vals), 0x0,
 661         "SLIMP3 message type", HFILL }},
 662
 663     { &hf_slimp3_ir,
 664       { "Infrared",           "slimp3.ir",
 665         FT_UINT32, BASE_HEX, NULL, 0x0,
 666         "SLIMP3 Infrared command", HFILL }},
 667
 668     { &hf_slimp3_control,
 669       { "Control Packet",   "slimp3.control",
 670         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 671         "SLIMP3 control", HFILL }},
 672
 673     { &hf_slimp3_display,
 674       { "Display",                    "slimp3.display",
 675         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 676         "SLIMP3 display", HFILL }},
 677
 678     { &hf_slimp3_hello,
 679       { "Hello",                      "slimp3.hello",
 680         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 681         "SLIMP3 hello", HFILL }},
 682
 683     { &hf_slimp3_i2c,
 684       { "I2C",                "slimp3.i2c",
 685         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 686         "SLIMP3 I2C", HFILL }},
 687
 688     { &hf_slimp3_data,
 689       { "Data",              "slimp3.data",
 690         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 691         "SLIMP3 Data", HFILL }},
 692
 693     { &hf_slimp3_data_request,
 694       { "Data Request",      "slimp3.data_req",
 695         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 696         "SLIMP3 Data Request", HFILL }},
 697
 698     { &hf_slimp3_discover_request,
 699       { "Discovery Request", "slimp3.discovery_req",
 700         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 701         "SLIMP3 Discovery Request", HFILL }},
 702
 703     { &hf_slimp3_discover_response,
 704       { "Discovery Response", "slimp3.discovery_response",
 705         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 706         "SLIMP3 Discovery Response", HFILL }},
 707
 708     { &hf_slimp3_data_ack,
 709       { "Data Ack",      "slimp3.data_ack",
 710         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 711         "SLIMP3 Data Ack", HFILL }},
 712
 713   };
 714   static gint *ett[] = {
 715     &ett_slimp3,
 716   };
 717
 718   proto_slimp3 = proto_register_protocol("SliMP3 Communication Protocol",
 719                                        "SliMP3", "slimp3");
 720   proto_register_field_array(proto_slimp3, hf, array_length(hf));
 721   proto_register_subtree_array(ett, array_length(ett));
 722
 723   slimp3_handle = create_dissector_handle(dissect_slimp3, proto_slimp3);
 724 }
 725
 726 void
 727 proto_reg_handoff_slimp3(void)
 728 {
 729   dissector_add("udp.port", UDP_PORT_SLIMP3_V1, slimp3_handle);
 730   dissector_add("udp.port", UDP_PORT_SLIMP3_V2, slimp3_handle);
 731 }