epan/dissectors/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  * $Id$
  10  *
  11  * Wireshark - Network traffic analyzer
  12  * By Gerald Combs <gerald@wireshark.org>
  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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 <ctype.h>
  37 #include <epan/packet.h>
  38
  39 #include "isprint.h"
  40
  41 static int proto_slimp3 = -1;
  42 static int hf_slimp3_opcode = -1;
  43 static int hf_slimp3_ir = -1;
  44 static int hf_slimp3_display = -1;
  45 static int hf_slimp3_control = -1;
  46 static int hf_slimp3_hello = -1;
  47 static int hf_slimp3_i2c = -1;
  48 static int hf_slimp3_data_request = -1;
  49 static int hf_slimp3_data = -1;
  50 static int hf_slimp3_discover_request = -1;
  51 static int hf_slimp3_discover_response = -1;
  52 static int hf_slimp3_data_ack = -1;
  53
  54 static gint ett_slimp3 = -1;
  55
  56 #define UDP_PORT_SLIMP3_V1    1069
  57 #define UDP_PORT_SLIMP3_V2    3483
  58
  59 #define SLIMP3_IR       'i'
  60 #define SLIMP3_CONTROL  's'
  61 #define SLIMP3_HELLO    'h'
  62 #define SLIMP3_DATA     'm'
  63 #define SLIMP3_DATA_REQ 'r'
  64 #define SLIMP3_DISPLAY  'l'
  65 #define SLIMP3_I2C      '2'
  66 #define SLIMP3_DISC_REQ 'd'
  67 #define SLIMP3_DISC_RSP 'D'
  68 #define SLIMP3_DATA_ACK 'a'
  69
  70 static const value_string slimp3_opcode_vals[] = {
  71   { SLIMP3_IR,       "Infrared Remote Code" },
  72   { SLIMP3_CONTROL,  "Stream Control" },
  73   { SLIMP3_DATA,     "MPEG Data" },
  74   { SLIMP3_DATA_REQ, "Data Request" },
  75   { SLIMP3_HELLO,    "Hello" },
  76   { SLIMP3_DISPLAY,  "Display" },
  77   { SLIMP3_I2C,      "I2C" },
  78   { SLIMP3_DISC_REQ, "Discovery Request" },
  79   { SLIMP3_DISC_RSP, "Discovery Response" },
  80   { SLIMP3_DATA_ACK, "Ack" },
  81   { 0,               NULL }
  82 };
  83
  84 /* IR remote control types */
  85 static const value_string slimp3_ir_types[] = {
  86     { 0x02, "SLIMP3" },
  87     { 0xff, "JVC DVD Player" },
  88
  89     { 0, NULL }
  90 };
  91
  92 /* IR codes for the custom SLIMP3 remote control */
  93 static const value_string slimp3_ir_codes_slimp3[] = {
  94     { 0x76899867, "0" },
  95     { 0x7689f00f, "1" },
  96     { 0x768908f7, "2" },
  97     { 0x76898877, "3" },
  98     { 0x768948b7, "4" },
  99     { 0x7689c837, "5" },
 100     { 0x768928d7, "6" },
 101     { 0x7689a857, "7" },
 102     { 0x76896897, "8" },
 103     { 0x7689e817, "9" },
 104     { 0x7689b04f, "arrow_down" },
 105     { 0x7689906f, "arrow_left" },
 106     { 0x7689d02f, "arrow_right" },
 107     { 0x7689e01f, "arrow_up" },
 108     { 0x768900ff, "voldown" },
 109     { 0x7689807f, "volup" },
 110     { 0x768940bf, "power" },
 111     { 0x7689c03f, "rew" },
 112     { 0x768920df, "pause" },
 113     { 0x7689a05f, "fwd" },
 114     { 0x7689609f, "add" },
 115     { 0x768910ef, "play" },
 116     { 0x768958a7, "search" },
 117     { 0x7689d827, "shuffle" },
 118     { 0x768938c7, "repeat" },
 119     { 0x7689b847, "sleep" },
 120     { 0x76897887, "now_playing" },
 121     { 0x7689f807, "size" },
 122     { 0x768904fb, "brightness" },
 123
 124     { 0,      NULL }
 125 };
 126
 127 /* IR codes for the JVC remote control */
 128 static const value_string slimp3_ir_codes_jvc[] = {
 129     { 0xf786, "One" },
 130     { 0xf746, "Two" },
 131     { 0xf7c6, "Three" },
 132     { 0xf726, "Four" },
 133     { 0xf7a6, "Five" },
 134     { 0xf766, "Six" },
 135     { 0xf7e6, "Seven" },
 136     { 0xf716, "Eight" },
 137     { 0xf796, "Nine" },
 138     { 0xf776, "Ten" },
 139
 140     { 0xf7f6, "Picture-In-Picture" },
 141     /* { 0xf7XX, "Enter" }, */
 142     { 0xf70e, "Back" },
 143     { 0xf732, "Play" },
 144     { 0xf76e, "Forward" },
 145     { 0xf743, "Record" },
 146     { 0xf7c2, "Stop" },
 147     { 0xf7b2, "Pause" },
 148     /* { 0xf7XX, "TV/Video" }, */
 149     { 0xf703, "Display" },
 150     { 0xf7b3, "Sleep" },
 151     { 0xf7b6, "Guide" },
 152     { 0xf70b, "Up" },
 153     { 0xf74b, "Left" },
 154     { 0xf7cb, "Right" },
 155     { 0xf78b, "Down" },
 156     { 0xf783, "Menu" },
 157     { 0xf72b, "OK" },
 158     { 0xf778, "Volume Up" },
 159     { 0xf7f8, "Volume Down" },
 160     { 0xf70d, "Channel Up" },
 161     { 0xf78d, "Channel Down" },
 162     /* { 0xf7XX, "Mute" },  */
 163     { 0xf7ab, "Recall" },
 164     { 0xf702, "Power" },
 165
 166     { 0,      NULL }
 167 };
 168
 169
 170 static const value_string slimp3_display_commands[] = {
 171     {  0x1, "Clear Display"},
 172     {  0x2, "Cursor to 1st Line Home"},
 173
 174     {  0x4, "Mode: Decrement Address, Shift Cursor"},
 175     {  0x5, "Mode: Decrement Address, Shift Display"},
 176     {  0x6, "Mode: Increment Address, Shift Cursor"},
 177     {  0x7, "Mode: Increment Address, Shift Display"},
 178
 179     {  0x8, "Display Off"},
 180     {  0xd, "Display On, With Blinking"},
 181     {  0xe, "Display On, With Cursor"},
 182     {  0xf, "Display On, With Cursor And Blinking"},
 183
 184     { 0x10, "Move Cursor Left"},
 185     { 0x14, "Move Cursor Right"},
 186     { 0x18, "Shift Display Left"},
 187     { 0x1b, "Shift Display Right"},
 188
 189     { 0x30, "Set (8-bit)"},
 190     { 0x20, "Set (4-bit)"},
 191
 192     { 0xa0, "Cursor to Top Right"},
 193     { 0xc0, "Cursor to 2nd Line Home"},
 194
 195     {    0, NULL},
 196 };
 197
 198 static const value_string slimp3_display_fset8[] = {
 199     { 0x0, "Brightness 100%"},
 200     { 0x1, "Brightness 75%"},
 201     { 0x2, "Brightness 50%"},
 202     { 0x3, "Brightness 25%"},
 203
 204     {   0, NULL },
 205 };
 206
 207 static const value_string slimp3_stream_control[] = {
 208     { 1, "Reset buffer, Start New Stream"},
 209     { 2, "Pause Playback"},
 210     { 4, "Resume Playback"},
 211     {   0, NULL },
 212 };
 213
 214
 215 static const value_string slimp3_mpg_control[] = {
 216     { 0, "Go"},           /* Run the decoder */
 217     { 1, "Stop"},         /* Halt decoder but don't reset rptr */
 218     { 3, "Reset"},        /* Halt decoder and reset rptr */
 219
 220     { 0, NULL }
 221 };
 222
 223 #define MAX_LCD_STR_LEN 128
 224 static int
 225 dissect_slimp3(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 226 {
 227     const char          *opcode_str;
 228     proto_tree          *slimp3_tree = NULL;
 229     proto_item          *ti = NULL, *hidden_item;
 230     gint                i1;
 231     gint                offset = 0;
 232     guint16             opcode;
 233     guchar              lcd_char;
 234     char                lcd_str[MAX_LCD_STR_LEN + 1];
 235     int                 to_server = FALSE;
 236     int                 old_protocol = FALSE;
 237     address             tmp_addr;
 238     gboolean            in_str;
 239     int                 lcd_strlen;
 240
 241     /*
 242      * If it doesn't begin with a known opcode, reject it, so that
 243      * traffic that happens to be do or from one of our ports
 244      * doesn't get misidentified as SliMP3 traffic.
 245      */
 246     if (!tvb_bytes_exist(tvb, offset, 1))
 247         return 0;       /* not even an opcode */
 248     opcode = tvb_get_guint8(tvb, offset);
 249     opcode_str = match_strval(opcode, slimp3_opcode_vals);
 250     if (opcode_str == NULL)
 251         return 0;
 252
 253     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SliMP3");
 254
 255     if (check_col(pinfo->cinfo, COL_INFO)) {
 256
 257         col_add_str(pinfo->cinfo, COL_INFO, opcode_str);
 258
 259     }
 260
 261     if (tree) {
 262
 263         ti = proto_tree_add_item(tree, proto_slimp3, tvb, offset, -1, ENC_NA);
 264         slimp3_tree = proto_item_add_subtree(ti, ett_slimp3);
 265
 266         proto_tree_add_uint(slimp3_tree, hf_slimp3_opcode, tvb,
 267                             offset, 1, opcode);
 268     }
 269
 270     /* The new protocol (v1.3 and later) uses an IANA-assigned port number.
 271     * It usually uses the same number for both sizes of the conversation, so
 272     * the port numbers can't always be used to determine client and server.
 273     * The new protocol places the clients MAC address in the packet, so that
 274     * is used to identify packets originating at the client.
 275     */
 276     if ((pinfo->destport == UDP_PORT_SLIMP3_V2) && (pinfo->srcport == UDP_PORT_SLIMP3_V2)) {
 277         SET_ADDRESS(&tmp_addr, AT_ETHER, 6, tvb_get_ptr(tvb, offset+12, 6));
 278         to_server = ADDRESSES_EQUAL(&tmp_addr, &pinfo->dl_src);
 279     }
 280     else if (pinfo->destport == UDP_PORT_SLIMP3_V2) {
 281         to_server = TRUE;
 282     }
 283     else if (pinfo->srcport == UDP_PORT_SLIMP3_V2) {
 284         to_server = FALSE;
 285     }
 286     if (pinfo->destport == UDP_PORT_SLIMP3_V1) {
 287         to_server = TRUE;
 288         old_protocol = TRUE;
 289     }
 290     else if (pinfo->srcport == UDP_PORT_SLIMP3_V1) {
 291         to_server = FALSE;
 292         old_protocol = TRUE;
 293     }
 294
 295     switch (opcode) {
 296
 297     case SLIMP3_IR:
 298         /* IR code
 299         *
 300         * [0]        'i' as in "IR"
 301         * [1]        0x00
 302         * [2..5]     player's time since startup in ticks @625 KHz
 303         * [6]        IR code id, ff=JVC, 02=SLIMP3
 304         * [7]        number of meaningful bits - 16 for JVC, 32 for SLIMP3
 305         * [8..11]    the 32-bit IR code
 306         * [12..17]   reserved
 307         */
 308         if (tree) {
 309             hidden_item = proto_tree_add_item(slimp3_tree, hf_slimp3_ir, tvb, offset+8, 4, ENC_BIG_ENDIAN);
 310             PROTO_ITEM_SET_HIDDEN(hidden_item);
 311
 312             i1 = tvb_get_ntohl(tvb, offset+2);
 313             proto_tree_add_text(slimp3_tree, tvb, offset+2, 4, "Uptime: %u sec (%u ticks)",
 314                                 i1/625000, i1);
 315             i1 = tvb_get_guint8(tvb, offset+6);
 316             proto_tree_add_text(slimp3_tree, tvb, offset+6, 1, "Code identifier: 0x%0x: %s",
 317                                 i1, val_to_str(i1, slimp3_ir_types, "Unknown"));
 318             proto_tree_add_text(slimp3_tree, tvb, offset+7, 1, "Code bits: %d",
 319                                 tvb_get_guint8(tvb, offset+7));
 320
 321             i1 = tvb_get_ntohl(tvb, offset+8);
 322             /* Check the code to figure out which remote is being used. */
 323             if (tvb_get_guint8(tvb, offset+6) == 0x02 &&
 324                 tvb_get_guint8(tvb, offset+7) == 32) {
 325                 /* This is the custom SLIMP3 remote. */
 326                 proto_tree_add_text(slimp3_tree, tvb, offset+8, 4,
 327                                     "Infrared Code: %s: 0x%0x",
 328                                     val_to_str(i1, slimp3_ir_codes_slimp3, "Unknown"), i1);
 329             }
 330             else if (tvb_get_guint8(tvb, offset+6) == 0xff &&
 331                      tvb_get_guint8(tvb, offset+7) == 16) {
 332                 /* This is a JVC DVD player remote */
 333                 proto_tree_add_text(slimp3_tree, tvb, offset+8, 4,
 334                                     "Infrared Code: %s: 0x%0x",
 335                                     val_to_str(i1, slimp3_ir_codes_jvc, "Unknown"), i1);
 336             } else {
 337                 /* Unknown code; just write it */
 338                 proto_tree_add_text(slimp3_tree, tvb, offset+8, 4, "Infrared Code: 0x%0x", i1);
 339             }
 340         }
 341         if (check_col(pinfo->cinfo, COL_INFO)) {
 342             i1 = tvb_get_ntohl(tvb, offset+8);
 343             if (tvb_get_guint8(tvb, offset+6) == 0x02 &&
 344                 tvb_get_guint8(tvb, offset+7) == 32) {
 345                 col_append_fstr(pinfo->cinfo, COL_INFO, ", SLIMP3: %s",
 346                                 val_to_str(i1, slimp3_ir_codes_slimp3, "Unknown (0x%0x)"));
 347             }
 348             else if (tvb_get_guint8(tvb, offset+6) == 0xff &&
 349                      tvb_get_guint8(tvb, offset+7) == 16) {
 350                 col_append_fstr(pinfo->cinfo, COL_INFO, ", JVC: %s",
 351                                 val_to_str(i1, slimp3_ir_codes_jvc, "Unknown (0x%0x)"));
 352             } else {
 353                 /* Unknown code; just write it */
 354                 col_append_fstr(pinfo->cinfo, COL_INFO, ", 0x%0x", i1);
 355             }
 356         }
 357         break;
 358
 359     case SLIMP3_DISPLAY:
 360         if (tree) {
 361
 362             hidden_item = proto_tree_add_item(slimp3_tree, hf_slimp3_display,
 363                                        tvb, offset, 1, ENC_BIG_ENDIAN);
 364             PROTO_ITEM_SET_HIDDEN(hidden_item);
 365
 366             /* Loop through the commands */
 367             i1 = 18;
 368             in_str = FALSE;
 369             lcd_strlen = 0;
 370             while (i1 < tvb_reported_length_remaining(tvb, offset)) {
 371                 switch(tvb_get_guint8(tvb, offset + i1)) {
 372                 case 0:
 373                     in_str = FALSE;
 374                     lcd_strlen = 0;
 375                     proto_tree_add_text(slimp3_tree, tvb, offset + i1, 2,
 376                                         "Delay (%d ms)", tvb_get_guint8(tvb, offset + i1 + 1));
 377                     i1 += 2;
 378                     break;
 379                 case 3:
 380                     lcd_char = tvb_get_guint8(tvb, offset + i1 + 1);
 381                     if (!isprint(lcd_char)) lcd_char = '.';
 382                     if (ti && in_str) {
 383                         lcd_strlen += 2;
 384                         proto_item_append_text(ti, "%c", lcd_char);
 385                         proto_item_set_len(ti, lcd_strlen);
 386                     } else {
 387                         ti = proto_tree_add_text(slimp3_tree, tvb, offset + i1, 2,
 388                                                  "String: %c", lcd_char);
 389                         in_str = TRUE;
 390                         lcd_strlen = 2;
 391                     }
 392                     i1 += 2;
 393                     break;
 394
 395                 case 2:
 396                     in_str = FALSE;
 397                     lcd_strlen = 0;
 398                     ti = proto_tree_add_text(slimp3_tree, tvb, offset + i1, 2,
 399                                              "Command: %s",
 400                                              val_to_str(tvb_get_guint8(tvb, offset + i1 + 1),
 401                                                         slimp3_display_commands,
 402                                                         "Unknown (0x%0x)"));
 403                     if ((tvb_get_guint8(tvb, offset + i1 + 1) & 0xf0) == 0x30) {
 404                         proto_item_append_text(ti, ": %s",
 405                                                val_to_str(tvb_get_guint8(tvb, offset + i1 + 2),
 406                                                           slimp3_display_fset8,
 407                                                           "Unknown (0x%0x)"));
 408                         i1 += 2;
 409                     }
 410                     i1 += 2;
 411                     break;
 412
 413                 default:
 414                     proto_tree_add_text(slimp3_tree, tvb, offset + i1, 2,
 415                                         "Unknown 0x%0x, 0x%0x",
 416                                         tvb_get_guint8(tvb, offset + i1),
 417                                         tvb_get_guint8(tvb, offset + i1 + 1));
 418                     i1 += 2;
 419                     break;
 420                 }
 421             }
 422         }
 423
 424         if (check_col(pinfo->cinfo, COL_INFO)) {
 425             i1 = 18;
 426             lcd_strlen = 0;
 427             while (tvb_offset_exists(tvb, offset + i1) &&
 428                     lcd_strlen < MAX_LCD_STR_LEN) {
 429                 switch (tvb_get_guint8(tvb, offset + i1)) {
 430
 431                 case 0:
 432                     lcd_str[lcd_strlen++] = '.';
 433                     break;
 434
 435                 case 2:
 436                     lcd_str[lcd_strlen++] = '|';
 437                     if (tvb_offset_exists(tvb, offset + i1 + 1) &&
 438                           (tvb_get_guint8(tvb, offset + i1 + 1) & 0xf0) == 0x30)
 439                         i1 += 2;
 440                     break;
 441
 442                 case 3:
 443                     if (tvb_offset_exists(tvb, offset + i1 + 1)) {
 444                         if (lcd_strlen < 1 ||
 445                               lcd_str[lcd_strlen-1] != ' ' ||
 446                               tvb_get_guint8(tvb, offset + i1 + 1) != ' ') {
 447                             lcd_char = tvb_get_guint8(tvb, offset + i1 + 1);
 448                             lcd_str[lcd_strlen++] = isprint(lcd_char) ? lcd_char : '.';
 449                         }
 450                     }
 451                 }
 452                 i1 += 2;
 453             }
 454             lcd_str[lcd_strlen] = '\0';
 455             if (lcd_strlen > 0)
 456                 col_append_fstr(pinfo->cinfo, COL_INFO, ", %s", lcd_str);
 457         }
 458
 459         break;
 460
 461     case SLIMP3_CONTROL:
 462         if (tree) {
 463             hidden_item = proto_tree_add_item(slimp3_tree, hf_slimp3_control,
 464                                        tvb, offset+1, 1, ENC_BIG_ENDIAN);
 465             PROTO_ITEM_SET_HIDDEN(hidden_item);
 466             proto_tree_add_text(slimp3_tree, tvb, offset+1, 1, "Command: %s",
 467                                 val_to_str(tvb_get_guint8(tvb, offset+1),
 468                                            slimp3_stream_control, "Unknown (0x%0x)"));
 469         }
 470
 471         if (check_col(pinfo->cinfo, COL_INFO)) {
 472             col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
 473                             val_to_str(tvb_get_guint8(tvb, offset+1),
 474                                        slimp3_stream_control, "Unknown (0x%0x)"));
 475         }
 476         break;
 477
 478     case SLIMP3_HELLO:
 479         if (tree) {
 480             hidden_item = proto_tree_add_item(slimp3_tree, hf_slimp3_hello,
 481                                        tvb, offset+1, 1, ENC_BIG_ENDIAN);
 482             PROTO_ITEM_SET_HIDDEN(hidden_item);
 483             if (to_server) {
 484                 guint8 fw_ver = 0;
 485                 /* Hello response; client->server */
 486                 proto_tree_add_text(slimp3_tree, tvb, offset, 1, "Hello Response (Client --> Server)");
 487                 proto_tree_add_text(slimp3_tree, tvb, offset+1, 1, "Device ID: %d",
 488                                     tvb_get_guint8(tvb, offset+1));
 489                 fw_ver = tvb_get_guint8(tvb, offset+2);
 490                 proto_tree_add_text(slimp3_tree, tvb, offset+2, 1, "Firmware Revision: %d.%d (0x%0x)",
 491                                     fw_ver>>4, fw_ver & 0xf, fw_ver);
 492             } else {
 493                 /* Hello request; server->client */
 494                 proto_tree_add_text(slimp3_tree, tvb, offset, 1, "Hello Request (Server --> Client)");
 495             }
 496         }
 497         break;
 498
 499     case SLIMP3_I2C:
 500         if (tree) {
 501             hidden_item = proto_tree_add_item(slimp3_tree, hf_slimp3_i2c,
 502                                        tvb, offset, 1, ENC_BIG_ENDIAN);
 503             PROTO_ITEM_SET_HIDDEN(hidden_item);
 504             if (to_server) {
 505                 /* Hello response; client->server */
 506                 proto_tree_add_text(slimp3_tree, tvb, offset, -1,
 507                                     "I2C Response (Client --> Server)");
 508             } else {
 509                 /* Hello request; server->client */
 510                 proto_tree_add_text(slimp3_tree, tvb, offset, -1,
 511                                     "I2C Request (Server --> Client)");
 512             }
 513         }
 514
 515         if (check_col(pinfo->cinfo, COL_INFO)) {
 516             if (to_server) {
 517                 col_append_str(pinfo->cinfo, COL_INFO, ", Response");
 518             } else {
 519                 col_append_str(pinfo->cinfo, COL_INFO, ", Request");
 520             }
 521         }
 522         break;
 523
 524     case SLIMP3_DATA_REQ:
 525         if (tree) {
 526             hidden_item = proto_tree_add_item(slimp3_tree, hf_slimp3_data_request,
 527                                        tvb, offset, 1, ENC_BIG_ENDIAN);
 528             PROTO_ITEM_SET_HIDDEN(hidden_item);
 529             proto_tree_add_text(slimp3_tree, tvb, offset+2, 2,
 530                                 "Requested offset: %d bytes.",
 531                                 tvb_get_ntohs(tvb, offset+2)*2);
 532         }
 533
 534         if (check_col(pinfo->cinfo, COL_INFO)) {
 535             col_append_fstr(pinfo->cinfo, COL_INFO, ", Offset: %d bytes",
 536                             tvb_get_ntohs(tvb, offset+2)*2);
 537         }
 538         break;
 539
 540     case SLIMP3_DATA:
 541         /* MPEG data (v1.3 and later)
 542         *
 543         *  [0]       'm'
 544         *  [1..5]    reserved
 545         *  [6..7]    Write pointer (in words)
 546         *  [8..9]    reserved
 547         *  [10..11]  Sequence number
 548         *  [12..17]  reserved
 549         *  [18..]    MPEG data
 550         */
 551         if (tree) {
 552             hidden_item = proto_tree_add_item(slimp3_tree, hf_slimp3_data,
 553                                        tvb, offset, 1, ENC_BIG_ENDIAN);
 554             PROTO_ITEM_SET_HIDDEN(hidden_item);
 555             if (old_protocol) {
 556                 proto_tree_add_text(slimp3_tree, tvb, offset, -1,
 557                                     "Length: %d bytes",
 558                                     tvb_reported_length_remaining(tvb, offset+18));
 559                 proto_tree_add_text(slimp3_tree, tvb, offset+2, 2,
 560                                     "Buffer offset: %d bytes.",
 561                                     tvb_get_ntohs(tvb, offset+2) * 2);
 562             }
 563             else {
 564                 proto_tree_add_text(slimp3_tree, tvb, offset+1, 1, "Command: %s",
 565                                     val_to_str(tvb_get_guint8(tvb, offset+1),
 566                                                slimp3_mpg_control, "Unknown (0x%0x)"));
 567                 proto_tree_add_text(slimp3_tree, tvb, offset, -1,
 568                                     "Length: %d bytes",
 569                                     tvb_reported_length_remaining(tvb, offset+18));
 570                 proto_tree_add_text(slimp3_tree, tvb, offset+6, 2,
 571                                     "Write Pointer: %d",
 572                                     tvb_get_ntohs(tvb, offset+6) * 2);
 573                 proto_tree_add_text(slimp3_tree, tvb, offset+10, 2,
 574                                     "Sequence: %d",
 575                                     tvb_get_ntohs(tvb, offset+10));
 576             }
 577         }
 578
 579         if (check_col(pinfo->cinfo, COL_INFO)) {
 580             if (old_protocol) {
 581                 col_append_fstr(pinfo->cinfo, COL_INFO,
 582                                 ", Length: %d bytes, Offset: %d bytes.",
 583                                 tvb_reported_length_remaining(tvb, offset+18),
 584                                 tvb_get_ntohs(tvb, offset+2) * 2);
 585             }
 586             else {
 587                 col_append_fstr(pinfo->cinfo, COL_INFO,
 588                                 ", %s, %d bytes at %d, Sequence: %d",
 589                                 val_to_str(tvb_get_guint8(tvb, offset+1),
 590                                            slimp3_mpg_control, "Unknown (0x%0x)"),
 591                                 tvb_reported_length_remaining(tvb, offset+18),
 592                                 tvb_get_ntohs(tvb, offset+6) * 2,
 593                                 tvb_get_ntohs(tvb, offset+10));
 594             }
 595         }
 596         break;
 597
 598     case SLIMP3_DISC_REQ:
 599         if (tree) {
 600             guint8 fw_ver;
 601             hidden_item = proto_tree_add_item(slimp3_tree, hf_slimp3_discover_request,
 602                                        tvb, offset, 1, ENC_BIG_ENDIAN);
 603             PROTO_ITEM_SET_HIDDEN(hidden_item);
 604             proto_tree_add_text(slimp3_tree, tvb, offset+1, 1,
 605                                 "Device ID: %d.", tvb_get_guint8(tvb, offset+1));
 606             fw_ver = tvb_get_guint8(tvb, offset+2);
 607             proto_tree_add_text(slimp3_tree, tvb, offset+2, 1, "Firmware Revision: %d.%d (0x%0x)",
 608                                 fw_ver>>4, fw_ver & 0xf, fw_ver);
 609         }
 610
 611         if (check_col(pinfo->cinfo, COL_INFO)) {
 612             guint8 fw_ver = tvb_get_guint8(tvb, offset+2);
 613             col_append_fstr(pinfo->cinfo, COL_INFO, ", Device ID: %d. Firmware: %d.%d",
 614                             tvb_get_guint8(tvb, offset+1), fw_ver>>4, fw_ver & 0xf);
 615         }
 616         break;
 617
 618     case SLIMP3_DISC_RSP:
 619         if (tree) {
 620             hidden_item = proto_tree_add_item(slimp3_tree, hf_slimp3_discover_response,
 621                                        tvb, offset, 1, ENC_BIG_ENDIAN);
 622             PROTO_ITEM_SET_HIDDEN(hidden_item);
 623             proto_tree_add_text(slimp3_tree, tvb, offset+2, 4,
 624                                 "Server Address: %s.",
 625                                 tvb_ip_to_str(tvb, offset+2));
 626             proto_tree_add_text(slimp3_tree, tvb, offset+6, 2,
 627                                 "Server Port: %d", tvb_get_ntohs(tvb, offset + 6));
 628         }
 629
 630         if (check_col(pinfo->cinfo, COL_INFO)) {
 631             col_append_fstr(pinfo->cinfo, COL_INFO, ", Server Address: %s. Server Port: %d",
 632                             tvb_ip_to_str(tvb, offset+2),
 633                             tvb_get_ntohs(tvb, offset + 6));
 634         }
 635         break;
 636
 637     case SLIMP3_DATA_ACK:
 638         /* Acknowledge MPEG data
 639         *
 640         *  [0]       'a'
 641         *  [1..5]
 642         *  [6..7]    Write pointer (in words)
 643         *  [8..9]    Read pointer (in words)
 644         *  [10..11]  Sequence number
 645         *  [12..17]  client MAC address (v1.3 and later)
 646         */
 647         if (tree) {
 648             hidden_item = proto_tree_add_item(slimp3_tree, hf_slimp3_data_ack,
 649                                        tvb, offset, 1, ENC_BIG_ENDIAN);
 650             PROTO_ITEM_SET_HIDDEN(hidden_item);
 651             proto_tree_add_text(slimp3_tree, tvb, offset+6, 2,
 652                                 "Write Pointer: %d",
 653                                 tvb_get_ntohs(tvb, offset+6) * 2);
 654             proto_tree_add_text(slimp3_tree, tvb, offset+8, 2,
 655                                 "Read Pointer: %d",
 656                                 tvb_get_ntohs(tvb, offset+8) * 2);
 657             proto_tree_add_text(slimp3_tree, tvb, offset+10, 2,
 658                                 "Sequence: %d",
 659                                 tvb_get_ntohs(tvb, offset+10));
 660         }
 661         if (check_col(pinfo->cinfo, COL_INFO)) {
 662             col_append_fstr(pinfo->cinfo, COL_INFO, ", Sequence: %d",
 663                             tvb_get_ntohs(tvb, offset+10));
 664         }
 665         break;
 666
 667     default:
 668         if (tree) {
 669             proto_tree_add_text(slimp3_tree, tvb, offset, -1,
 670                                 "Data (%d bytes)", tvb_reported_length_remaining(tvb, offset));
 671         }
 672         break;
 673
 674     }
 675     return tvb_length(tvb);
 676 }
 677
 678 void
 679 proto_register_slimp3(void)
 680 {
 681   static hf_register_info hf[] = {
 682     { &hf_slimp3_opcode,
 683       { "Opcode",             "slimp3.opcode",
 684         FT_UINT8, BASE_DEC, VALS(slimp3_opcode_vals), 0x0,
 685         "SLIMP3 message type", HFILL }},
 686
 687     { &hf_slimp3_ir,
 688       { "Infrared",           "slimp3.ir",
 689         FT_UINT32, BASE_HEX, NULL, 0x0,
 690         "SLIMP3 Infrared command", HFILL }},
 691
 692     { &hf_slimp3_control,
 693       { "Control Packet",   "slimp3.control",
 694         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 695         "SLIMP3 control", HFILL }},
 696
 697     { &hf_slimp3_display,
 698       { "Display",                    "slimp3.display",
 699         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 700         "SLIMP3 display", HFILL }},
 701
 702     { &hf_slimp3_hello,
 703       { "Hello",                      "slimp3.hello",
 704         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 705         "SLIMP3 hello", HFILL }},
 706
 707     { &hf_slimp3_i2c,
 708       { "I2C",                "slimp3.i2c",
 709         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 710         "SLIMP3 I2C", HFILL }},
 711
 712     { &hf_slimp3_data,
 713       { "Data",              "slimp3.data",
 714         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 715         "SLIMP3 Data", HFILL }},
 716
 717     { &hf_slimp3_data_request,
 718       { "Data Request",      "slimp3.data_req",
 719         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 720         "SLIMP3 Data Request", HFILL }},
 721
 722     { &hf_slimp3_discover_request,
 723       { "Discovery Request", "slimp3.discovery_req",
 724         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 725         "SLIMP3 Discovery Request", HFILL }},
 726
 727     { &hf_slimp3_discover_response,
 728       { "Discovery Response", "slimp3.discovery_response",
 729         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 730         "SLIMP3 Discovery Response", HFILL }},
 731
 732     { &hf_slimp3_data_ack,
 733       { "Data Ack",      "slimp3.data_ack",
 734         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 735         "SLIMP3 Data Ack", HFILL }},
 736
 737   };
 738   static gint *ett[] = {
 739     &ett_slimp3,
 740   };
 741
 742   proto_slimp3 = proto_register_protocol("SliMP3 Communication Protocol",
 743                                        "SliMP3", "slimp3");
 744   proto_register_field_array(proto_slimp3, hf, array_length(hf));
 745   proto_register_subtree_array(ett, array_length(ett));
 746 }
 747
 748 void
 749 proto_reg_handoff_slimp3(void)
 750 {
 751   dissector_handle_t slimp3_handle;
 752
 753   slimp3_handle = new_create_dissector_handle(dissect_slimp3, proto_slimp3);
 754   dissector_add_uint("udp.port", UDP_PORT_SLIMP3_V1, slimp3_handle);
 755   dissector_add_uint("udp.port", UDP_PORT_SLIMP3_V2, slimp3_handle);
 756 }