epan/dissectors/packet-pingpongprotocol.c

   1 /* packet-pingpongprotocol.c
   2  * Routines for the Ping Pong Protocol, a test application of the
   3  * RSPLIB RSerPool implementation
   4  * https://www.uni-due.de/~be0001/rserpool/
   5  *
   6  * Copyright 2006-2021 by Thomas Dreibholz <dreibh [AT] iem.uni-due.de>
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 1998 Gerald Combs
  11  *
  12  * Copied from README.developer
  13  *
  14  * SPDX-License-Identifier: GPL-2.0-or-later
  15  */
  16
  17 #include "config.h"
  18
  19 #include <epan/packet.h>
  20 #include <epan/sctpppids.h>
  21 #include <epan/stat_tap_ui.h>
  22
  23 #include <wsutil/array.h>
  24
  25 #define PINGPONGPROTOCOL_PAYLOAD_PROTOCOL_ID_LEGACY 0x29097602
  26
  27 void proto_register_pingpongprotocol(void);
  28 void proto_reg_handoff_pingpongprotocol(void);
  29
  30 static dissector_handle_t pingpongprotocol_handle;
  31
  32 /* Initialize the protocol and registered fields */
  33 static int proto_pingpongprotocol;
  34 static int tap_pingpongprotocol           = -1;
  35 static int ett_pingpongprotocol;
  36 static int hf_message_type;
  37 static int hf_message_flags;
  38 static int hf_message_length;
  39 static int hf_ping_messageno;
  40 static int hf_ping_data;
  41 static int hf_pong_messageno;
  42 static int hf_pong_replyno;
  43 static int hf_pong_data;
  44
  45 static uint64_t pingpongprotocol_total_msgs;
  46 static uint64_t pingpongprotocol_total_bytes;
  47
  48 /* Dissectors for messages. This is specific to PingPongProtocol */
  49 #define MESSAGE_TYPE_LENGTH    1
  50 #define MESSAGE_FLAGS_LENGTH   1
  51 #define MESSAGE_LENGTH_LENGTH  2
  52
  53 #define MESSAGE_TYPE_OFFSET    0
  54 #define MESSAGE_FLAGS_OFFSET   (MESSAGE_TYPE_OFFSET    + MESSAGE_TYPE_LENGTH)
  55 #define MESSAGE_LENGTH_OFFSET  (MESSAGE_FLAGS_OFFSET   + MESSAGE_FLAGS_LENGTH)
  56 #define MESSAGE_VALUE_OFFSET   (MESSAGE_LENGTH_OFFSET  + MESSAGE_LENGTH_LENGTH)
  57
  58
  59 #define PING_MESSAGENO_LENGTH 8
  60
  61 #define PING_MESSAGENO_OFFSET MESSAGE_VALUE_OFFSET
  62 #define PING_DATA_OFFSET      (PING_MESSAGENO_OFFSET + PING_MESSAGENO_LENGTH)
  63
  64 #define PONG_MESSAGENO_LENGTH 8
  65 #define PONG_REPLYNO_LENGTH   8
  66
  67 #define PONG_MESSAGENO_OFFSET  MESSAGE_VALUE_OFFSET
  68 #define PONG_REPLYNO_OFFSET    (PONG_MESSAGENO_OFFSET + PONG_MESSAGENO_LENGTH)
  69 #define PONG_DATA_OFFSET       (PONG_REPLYNO_OFFSET + PONG_REPLYNO_LENGTH)
  70
  71
  72 #define PINGPONG_PING_MESSAGE_TYPE 0x01
  73 #define PINGPONG_PONG_MESSAGE_TYPE 0x02
  74
  75
  76
  77 static const value_string message_type_values[] = {
  78   { PINGPONG_PONG_MESSAGE_TYPE, "PingPongProtocol Pong" },
  79   { PINGPONG_PING_MESSAGE_TYPE, "PingPongProtocol Ping" },
  80   { 0, NULL }
  81 };
  82
  83
  84 typedef struct _tap_pingpongprotocol_rec_t {
  85   uint8_t     type;
  86   uint16_t    size;
  87   const char* type_string;
  88 } tap_pingpongprotocol_rec_t;
  89
  90
  91 static void
  92 dissect_pingpongprotocol_ping_message(tvbuff_t *message_tvb, proto_tree *message_tree)
  93 {
  94   uint16_t ping_data_length;
  95
  96   proto_tree_add_item(message_tree, hf_ping_messageno, message_tvb, PING_MESSAGENO_OFFSET, PING_MESSAGENO_LENGTH, ENC_BIG_ENDIAN);
  97
  98   ping_data_length = tvb_get_ntohs(message_tvb, MESSAGE_LENGTH_OFFSET) - PING_DATA_OFFSET;
  99   if (ping_data_length > 0)
 100     proto_tree_add_item(message_tree, hf_ping_data, message_tvb, PING_DATA_OFFSET, ping_data_length, ENC_NA);
 101 }
 102
 103 static void
 104 dissect_pingpongprotocol_pong_message(tvbuff_t *message_tvb, proto_tree *message_tree)
 105 {
 106   uint16_t pong_data_length;
 107
 108   proto_tree_add_item(message_tree, hf_pong_messageno, message_tvb, PONG_MESSAGENO_OFFSET, PONG_MESSAGENO_LENGTH, ENC_BIG_ENDIAN);
 109   proto_tree_add_item(message_tree, hf_pong_replyno,   message_tvb, PONG_REPLYNO_OFFSET,   PONG_REPLYNO_LENGTH,   ENC_BIG_ENDIAN);
 110
 111   pong_data_length = tvb_get_ntohs(message_tvb, MESSAGE_LENGTH_OFFSET) - PONG_DATA_OFFSET;
 112   if (pong_data_length > 0) {
 113     proto_tree_add_item(message_tree, hf_pong_data, message_tvb, PONG_DATA_OFFSET, pong_data_length, ENC_NA);
 114   }
 115 }
 116
 117
 118 static void
 119 dissect_pingpongprotocol_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *pingpongprotocol_tree)
 120 {
 121   tap_pingpongprotocol_rec_t* tap_rec = wmem_new0(pinfo->pool, tap_pingpongprotocol_rec_t);
 122   tap_rec->type        = tvb_get_uint8(message_tvb, MESSAGE_TYPE_OFFSET);
 123   tap_rec->size        = tvb_get_ntohs(message_tvb,  MESSAGE_LENGTH_OFFSET);
 124   tap_rec->type_string = val_to_str_const(tap_rec->type, message_type_values, "Unknown PingPongProtocol message type");
 125   tap_queue_packet(tap_pingpongprotocol, pinfo, tap_rec);
 126
 127   col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", tap_rec->type_string);
 128
 129   proto_tree_add_item(pingpongprotocol_tree, hf_message_type,   message_tvb, MESSAGE_TYPE_OFFSET,   MESSAGE_TYPE_LENGTH,   ENC_BIG_ENDIAN);
 130   proto_tree_add_item(pingpongprotocol_tree, hf_message_flags,  message_tvb, MESSAGE_FLAGS_OFFSET,  MESSAGE_FLAGS_LENGTH,  ENC_BIG_ENDIAN);
 131   proto_tree_add_item(pingpongprotocol_tree, hf_message_length, message_tvb, MESSAGE_LENGTH_OFFSET, MESSAGE_LENGTH_LENGTH, ENC_BIG_ENDIAN);
 132   switch (tap_rec->type) {
 133     case PINGPONG_PING_MESSAGE_TYPE:
 134       dissect_pingpongprotocol_ping_message(message_tvb, pingpongprotocol_tree);
 135      break;
 136     case PINGPONG_PONG_MESSAGE_TYPE:
 137       dissect_pingpongprotocol_pong_message(message_tvb, pingpongprotocol_tree);
 138      break;
 139   }
 140 }
 141
 142 static int
 143 dissect_pingpongprotocol(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
 144 {
 145   proto_item *pingpongprotocol_item;
 146   proto_tree *pingpongprotocol_tree;
 147
 148   col_set_str(pinfo->cinfo, COL_PROTOCOL, "PingPongProtocol");
 149
 150   /* In the interest of speed, if "tree" is NULL, don't do any work not
 151      necessary to generate protocol tree items. */
 152   if (tree) {
 153     /* create the pingpongprotocol protocol tree */
 154     pingpongprotocol_item = proto_tree_add_item(tree, proto_pingpongprotocol, message_tvb, 0, -1, ENC_NA);
 155     pingpongprotocol_tree = proto_item_add_subtree(pingpongprotocol_item, ett_pingpongprotocol);
 156   } else {
 157     pingpongprotocol_tree = NULL;
 158   };
 159   /* dissect the message */
 160   dissect_pingpongprotocol_message(message_tvb, pinfo, pingpongprotocol_tree);
 161   return true;
 162 }
 163
 164
 165 /* TAP STAT INFO */
 166 typedef enum
 167 {
 168   MESSAGE_TYPE_COLUMN = 0,
 169   MESSAGES_COLUMN,
 170   MESSAGES_SHARE_COLUMN,
 171   BYTES_COLUMN,
 172   BYTES_SHARE_COLUMN,
 173   FIRST_SEEN_COLUMN,
 174   LAST_SEEN_COLUMN,
 175   INTERVAL_COLUMN,
 176   MESSAGE_RATE_COLUMN,
 177   BYTE_RATE_COLUMN
 178 } pingpongprotocol_stat_columns;
 179
 180 static stat_tap_table_item pingpongprotocol_stat_fields[] = {
 181   { TABLE_ITEM_STRING, TAP_ALIGN_LEFT,  "PingPongProtocol Message Type", "%-25s" },
 182   { TABLE_ITEM_UINT,   TAP_ALIGN_RIGHT, "Messages ",            "%u"       },
 183   { TABLE_ITEM_UINT,   TAP_ALIGN_RIGHT, "Messages Share (%)"  , "%1.3f %%" },
 184   { TABLE_ITEM_UINT,   TAP_ALIGN_RIGHT, "Bytes (B)",            "%u"       },
 185   { TABLE_ITEM_UINT,   TAP_ALIGN_RIGHT, "Bytes Share (%) ",     "%1.3f %%" },
 186   { TABLE_ITEM_FLOAT,  TAP_ALIGN_LEFT,  "First Seen (s)",       "%1.6f"    },
 187   { TABLE_ITEM_FLOAT,  TAP_ALIGN_LEFT,  "Last Seen (s)",        "%1.6f"    },
 188   { TABLE_ITEM_FLOAT,  TAP_ALIGN_LEFT,  "Interval (s)",         "%1.6f"    },
 189   { TABLE_ITEM_FLOAT,  TAP_ALIGN_LEFT,  "Message Rate (Msg/s)", "%1.2f"    },
 190   { TABLE_ITEM_FLOAT,  TAP_ALIGN_LEFT,  "Byte Rate (B/s)",      "%1.2f"    }
 191 };
 192
 193 static void pingpongprotocol_stat_init(stat_tap_table_ui* new_stat)
 194 {
 195   const char *table_name = "PingPongProtocol Statistics";
 196   int num_fields = array_length(pingpongprotocol_stat_fields);
 197   stat_tap_table *table;
 198   int i = 0;
 199   stat_tap_table_item_type items[array_length(pingpongprotocol_stat_fields)];
 200
 201   table = stat_tap_find_table(new_stat, table_name);
 202   if (table) {
 203     if (new_stat->stat_tap_reset_table_cb) {
 204       new_stat->stat_tap_reset_table_cb(table);
 205     }
 206     return;
 207   }
 208
 209   table = stat_tap_init_table(table_name, num_fields, 0, NULL);
 210   stat_tap_add_table(new_stat, table);
 211
 212   memset(items, 0x0, sizeof(items));
 213   /* Add a row for each value type */
 214   while (message_type_values[i].strptr) {
 215     items[MESSAGE_TYPE_COLUMN].type                = TABLE_ITEM_STRING;
 216     items[MESSAGE_TYPE_COLUMN].value.string_value  = message_type_values[i].strptr;
 217     items[MESSAGES_COLUMN].type                    = TABLE_ITEM_UINT;
 218     items[MESSAGES_COLUMN].value.uint_value        = 0;
 219     items[MESSAGES_SHARE_COLUMN].type              = TABLE_ITEM_NONE;
 220     items[MESSAGES_SHARE_COLUMN].value.float_value = -1.0;
 221     items[BYTES_COLUMN].type                       = TABLE_ITEM_UINT;
 222     items[BYTES_COLUMN].value.uint_value           = 0;
 223     items[BYTES_SHARE_COLUMN].type                 = TABLE_ITEM_NONE;
 224     items[BYTES_SHARE_COLUMN].value.float_value    = -1.0;
 225     items[FIRST_SEEN_COLUMN].type                  = TABLE_ITEM_NONE;
 226     items[FIRST_SEEN_COLUMN].value.float_value     = DBL_MAX;
 227     items[LAST_SEEN_COLUMN].type                   = TABLE_ITEM_NONE;
 228     items[LAST_SEEN_COLUMN].value.float_value      = DBL_MIN;
 229     items[INTERVAL_COLUMN].type                    = TABLE_ITEM_NONE;
 230     items[INTERVAL_COLUMN].value.float_value       = -1.0;
 231     items[MESSAGE_RATE_COLUMN].type                = TABLE_ITEM_NONE;
 232     items[MESSAGE_RATE_COLUMN].value.float_value   = -1.0;
 233     items[BYTE_RATE_COLUMN].type                   = TABLE_ITEM_NONE;
 234     items[BYTE_RATE_COLUMN].value.float_value      = -1.0;
 235     stat_tap_init_table_row(table, i, num_fields, items);
 236     i++;
 237   }
 238 }
 239
 240 static tap_packet_status
 241 pingpongprotocol_stat_packet(void* tapdata, packet_info* pinfo _U_, epan_dissect_t* edt _U_, const void* data, tap_flags_t flags _U_)
 242 {
 243   stat_data_t*                      stat_data = (stat_data_t*)tapdata;
 244   const tap_pingpongprotocol_rec_t* tap_rec   = (const tap_pingpongprotocol_rec_t*)data;
 245   stat_tap_table*                   table;
 246   stat_tap_table_item_type*         msg_data;
 247   int                               idx;
 248   uint64_t                          messages;
 249   uint64_t                          bytes;
 250   int                               i         = 0;
 251   double                            firstSeen = -1.0;
 252   double                            lastSeen  = -1.0;
 253
 254   idx = str_to_val_idx(tap_rec->type_string, message_type_values);
 255   if (idx < 0)
 256     return TAP_PACKET_DONT_REDRAW;
 257
 258   table = g_array_index(stat_data->stat_tap_data->tables, stat_tap_table*, 0);
 259
 260   /* Update packets counter */
 261   pingpongprotocol_total_msgs++;
 262   msg_data = stat_tap_get_field_data(table, idx, MESSAGES_COLUMN);
 263   msg_data->value.uint_value++;
 264   messages = msg_data->value.uint_value;
 265   stat_tap_set_field_data(table, idx, MESSAGES_COLUMN, msg_data);
 266
 267   /* Update bytes counter */
 268   pingpongprotocol_total_bytes += tap_rec->size;
 269   msg_data = stat_tap_get_field_data(table, idx, BYTES_COLUMN);
 270   msg_data->value.uint_value += tap_rec->size;
 271   bytes = msg_data->value.uint_value;
 272   stat_tap_set_field_data(table, idx, BYTES_COLUMN, msg_data);
 273
 274   /* Update messages and bytes share */
 275   while (message_type_values[i].strptr) {
 276     msg_data = stat_tap_get_field_data(table, i, MESSAGES_COLUMN);
 277     const unsigned m = msg_data->value.uint_value;
 278     msg_data = stat_tap_get_field_data(table, i, BYTES_COLUMN);
 279     const unsigned b = msg_data->value.uint_value;
 280
 281     msg_data = stat_tap_get_field_data(table, i, MESSAGES_SHARE_COLUMN);
 282     msg_data->type = TABLE_ITEM_FLOAT;
 283     msg_data->value.float_value = 100.0 * m / (double)pingpongprotocol_total_msgs;
 284     stat_tap_set_field_data(table, i, MESSAGES_SHARE_COLUMN, msg_data);
 285
 286     msg_data = stat_tap_get_field_data(table, i, BYTES_SHARE_COLUMN);
 287     msg_data->type = TABLE_ITEM_FLOAT;
 288     msg_data->value.float_value = 100.0 * b / (double)pingpongprotocol_total_bytes;
 289     stat_tap_set_field_data(table, i, BYTES_SHARE_COLUMN, msg_data);
 290     i++;
 291   }
 292
 293   /* Update first seen time */
 294   if (pinfo->presence_flags & PINFO_HAS_TS) {
 295     msg_data = stat_tap_get_field_data(table, idx, FIRST_SEEN_COLUMN);
 296     msg_data->type = TABLE_ITEM_FLOAT;
 297     msg_data->value.float_value = MIN(msg_data->value.float_value, nstime_to_sec(&pinfo->rel_ts));
 298     firstSeen = msg_data->value.float_value;
 299     stat_tap_set_field_data(table, idx, FIRST_SEEN_COLUMN, msg_data);
 300   }
 301
 302   /* Update last seen time */
 303   if (pinfo->presence_flags & PINFO_HAS_TS) {
 304     msg_data = stat_tap_get_field_data(table, idx, LAST_SEEN_COLUMN);
 305     msg_data->type = TABLE_ITEM_FLOAT;
 306     msg_data->value.float_value = MAX(msg_data->value.float_value, nstime_to_sec(&pinfo->rel_ts));
 307     lastSeen = msg_data->value.float_value;
 308     stat_tap_set_field_data(table, idx, LAST_SEEN_COLUMN, msg_data);
 309   }
 310
 311   if ((lastSeen - firstSeen) > 0.0) {
 312     /* Update interval */
 313     msg_data = stat_tap_get_field_data(table, idx, INTERVAL_COLUMN);
 314     msg_data->type = TABLE_ITEM_FLOAT;
 315     msg_data->value.float_value = lastSeen - firstSeen;
 316     stat_tap_set_field_data(table, idx, INTERVAL_COLUMN, msg_data);
 317
 318     /* Update message rate */
 319     msg_data = stat_tap_get_field_data(table, idx, MESSAGE_RATE_COLUMN);
 320     msg_data->type = TABLE_ITEM_FLOAT;
 321     msg_data->value.float_value = messages / (lastSeen - firstSeen);
 322     stat_tap_set_field_data(table, idx, MESSAGE_RATE_COLUMN, msg_data);
 323
 324     /* Update byte rate */
 325     msg_data = stat_tap_get_field_data(table, idx, BYTE_RATE_COLUMN);
 326     msg_data->type = TABLE_ITEM_FLOAT;
 327     msg_data->value.float_value = bytes / (lastSeen - firstSeen);
 328     stat_tap_set_field_data(table, idx, BYTE_RATE_COLUMN, msg_data);
 329   }
 330
 331   return TAP_PACKET_REDRAW;
 332 }
 333
 334 static void
 335 pingpongprotocol_stat_reset(stat_tap_table* table)
 336 {
 337   unsigned element;
 338   stat_tap_table_item_type* item_data;
 339
 340   for (element = 0; element < table->num_elements; element++) {
 341     item_data = stat_tap_get_field_data(table, element, MESSAGES_COLUMN);
 342     item_data->value.uint_value = 0;
 343     stat_tap_set_field_data(table, element, MESSAGES_COLUMN, item_data);
 344
 345     item_data = stat_tap_get_field_data(table, element, MESSAGES_SHARE_COLUMN);
 346     item_data->type = TABLE_ITEM_NONE;
 347     item_data->value.float_value = -1.0;
 348     stat_tap_set_field_data(table, element, MESSAGES_SHARE_COLUMN, item_data);
 349
 350     item_data = stat_tap_get_field_data(table, element, BYTES_COLUMN);
 351     item_data->value.uint_value = 0;
 352     stat_tap_set_field_data(table, element, BYTES_COLUMN, item_data);
 353
 354     item_data = stat_tap_get_field_data(table, element, BYTES_SHARE_COLUMN);
 355     item_data->type = TABLE_ITEM_NONE;
 356     item_data->value.float_value = -1.0;
 357     stat_tap_set_field_data(table, element, BYTES_SHARE_COLUMN, item_data);
 358
 359     item_data = stat_tap_get_field_data(table, element, FIRST_SEEN_COLUMN);
 360     item_data->type = TABLE_ITEM_NONE;
 361     item_data->value.float_value = DBL_MAX;
 362     stat_tap_set_field_data(table, element, FIRST_SEEN_COLUMN, item_data);
 363
 364     item_data = stat_tap_get_field_data(table, element, LAST_SEEN_COLUMN);
 365     item_data->type = TABLE_ITEM_NONE;
 366     item_data->value.float_value = DBL_MIN;
 367     stat_tap_set_field_data(table, element, LAST_SEEN_COLUMN, item_data);
 368
 369     item_data = stat_tap_get_field_data(table, element, INTERVAL_COLUMN);
 370     item_data->type = TABLE_ITEM_NONE;
 371     item_data->value.float_value = -1.0;
 372     stat_tap_set_field_data(table, element, INTERVAL_COLUMN, item_data);
 373
 374     item_data = stat_tap_get_field_data(table, element, MESSAGE_RATE_COLUMN);
 375     item_data->type = TABLE_ITEM_NONE;
 376     item_data->value.float_value = -1.0;
 377     stat_tap_set_field_data(table, element, MESSAGE_RATE_COLUMN, item_data);
 378
 379     item_data = stat_tap_get_field_data(table, element, BYTE_RATE_COLUMN);
 380     item_data->type = TABLE_ITEM_NONE;
 381     item_data->value.float_value = -1.0;
 382     stat_tap_set_field_data(table, element, BYTE_RATE_COLUMN, item_data);
 383   }
 384   pingpongprotocol_total_msgs  = 0;
 385   pingpongprotocol_total_bytes = 0;
 386 }
 387
 388
 389 /* Register the protocol with Wireshark */
 390 void
 391 proto_register_pingpongprotocol(void)
 392 {
 393
 394   /* Setup list of header fields */
 395   static hf_register_info hf[] = {
 396     { &hf_message_type,   { "Type",      "pingpongprotocol.message_type",   FT_UINT8,  BASE_DEC,  VALS(message_type_values), 0x0, NULL, HFILL } },
 397     { &hf_message_flags,  { "Flags",     "pingpongprotocol.message_flags",  FT_UINT8,  BASE_DEC,  NULL,                      0x0, NULL, HFILL } },
 398     { &hf_message_length, { "Length",    "pingpongprotocol.message_length", FT_UINT16, BASE_DEC,  NULL,                      0x0, NULL, HFILL } },
 399     { &hf_ping_messageno, { "MessageNo", "pingpongprotocol.ping_messageno", FT_UINT64, BASE_DEC,  NULL,                      0x0, NULL, HFILL } },
 400     { &hf_ping_data,      { "Ping_Data", "pingpongprotocol.ping_data",      FT_BYTES,  BASE_NONE, NULL,                      0x0, NULL, HFILL } },
 401     { &hf_pong_messageno, { "MessageNo", "pingpongprotocol.pong_messageno", FT_UINT64, BASE_DEC,  NULL,                      0x0, NULL, HFILL } },
 402     { &hf_pong_replyno,   { "ReplyNo",   "pingpongprotocol.pong_replyno",   FT_UINT64, BASE_DEC,  NULL,                      0x0, NULL, HFILL } },
 403     { &hf_pong_data,      { "Pong_Data", "pingpongprotocol.pong_data",      FT_BYTES,  BASE_NONE, NULL,                      0x0, NULL, HFILL } },
 404   };
 405
 406   /* Setup protocol subtree array */
 407   static int *ett[] = {
 408     &ett_pingpongprotocol
 409   };
 410
 411   static tap_param pingpongprotocol_stat_params[] = {
 412     { PARAM_FILTER, "filter", "Filter", NULL, true }
 413   };
 414
 415   static stat_tap_table_ui pingpongprotocol_stat_table = {
 416     REGISTER_STAT_GROUP_RSERPOOL,
 417     "PingPongProtocol Statistics",
 418     "pingpongprotocol",
 419     "pingpongprotocol,stat",
 420     pingpongprotocol_stat_init,
 421     pingpongprotocol_stat_packet,
 422     pingpongprotocol_stat_reset,
 423     NULL,
 424     NULL,
 425     array_length(pingpongprotocol_stat_fields), pingpongprotocol_stat_fields,
 426     array_length(pingpongprotocol_stat_params), pingpongprotocol_stat_params,
 427     NULL,
 428     0
 429   };
 430
 431   /* Register the protocol name and description */
 432   proto_pingpongprotocol = proto_register_protocol("Ping Pong Protocol", "PingPongProtocol",  "pingpongprotocol");
 433
 434   /* Required function calls to register the header fields and subtrees used */
 435   proto_register_field_array(proto_pingpongprotocol, hf, array_length(hf));
 436   proto_register_subtree_array(ett, array_length(ett));
 437   tap_pingpongprotocol = register_tap("pingpongprotocol");
 438
 439   /* Register the dissector handle */
 440   pingpongprotocol_handle = register_dissector("pingpongprotocol", dissect_pingpongprotocol, proto_pingpongprotocol);
 441
 442   register_stat_tap_table_ui(&pingpongprotocol_stat_table);
 443 }
 444
 445 void
 446 proto_reg_handoff_pingpongprotocol(void)
 447 {
 448   dissector_add_uint("sctp.ppi", PINGPONGPROTOCOL_PAYLOAD_PROTOCOL_ID_LEGACY, pingpongprotocol_handle);
 449   dissector_add_uint("sctp.ppi", PPP_PAYLOAD_PROTOCOL_ID, pingpongprotocol_handle);
 450 }
 451
 452 /*
 453  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 454  *
 455  * Local Variables:
 456  * c-basic-offset: 2
 457  * tab-width: 8
 458  * indent-tabs-mode: nil
 459  * End:
 460  *
 461  * ex: set shiftwidth=2 tabstop=8 expandtab:
 462  * :indentSize=2:tabSize=8:noTabs=true:
 463  */