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wireshark/packet-wcp.c

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/* packet-wcp.c
* Routines for Wellfleet Compression frame disassembly
* Copyright 2001, Jeffrey C. Foster <jfoste@woodward.com>
*
* $Id: packet-wcp.c,v 1.28 2002/08/28 21:00:37 jmayer Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* ToDo:
* Add preference to allow/disallow decompression
* Calculate and verify check byte (last byte), if only we knew how!
* Handle Wellfleet compression over PPP links.
* - This will require changing the sub-dissector call
* routine to determine if layer 2 is frame relay or
* or PPP and different sub-dissector routines for each.
*
* Based upon information in the Nortel TCL based Pcaptap code.
*http://www.mynetworkforum.com/tools/PCAPTAP/pcaptap-Win32-3.00.exe
*
* And lzss algorithm
*http://www.rasip.fer.hr/research/compress/algorithms/fund/lz/lzss.html
*/
/*
* Wellfleet compression is a variation on LZSS encoding.
*
* Compression is done by keeping a sliding window of previous
* data transmited. The sender will use a pattern match to
* encode repeated data as a data pointer field. Then a stream
* of pointers and actual data bytes. The pointer values include
* an offset to previous data in the stream and the length of the
* matching data.
*
* The data pattern matching is done on the octects.
*
* The data is encoded as 8 field blocks with a compression flag
* byte at the beginning. If the bit is set in the compression
* flag, then that field has a compression field. If it isn't set
* then the byte is raw data.
*
* The compression field is either 2 or 3 bytes long. The length
* is determined by the length of the matching data, for short
* matches the match length is encoded in the high nibble of the
* first byte. Otherwise the third byte of the field contains
* the match length.
*
* First byte -
* lower 4 bits:
* High order nibble of the offset
*
* upper 4 bits:
* 1 = length is in 3rd byte
* 2-F = length of matching data - 1
*
* Second byte -
* Lower byte of the source offset.
*
* Third byte -
* Length of match - 1 if First byte upper nibble = 1, otherwise
* this byte isn't added to data stream.
*
* Example:
* Uncompressed data (hex): 11 22 22 22 22 33 44 55 66 77
*
*
* Compression data :
* Flag bits: 0x20 (third field is compressed)
* Data: 11 22 20 00 33 44 55
* / / / /
* raw data ------+--+ / /
* (Comp length - 1)<<4+ /
* Data offset ----------+
*
* Output data (hex): 20 11 22 20 00 33 44 55 66 77
*
* In this example the copy src is one byte behind the copy destination
* so if appears as if output is being loaded with the source byte.
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <glib.h>
#include <string.h>
#include <epan/packet.h>
#include "packet-frame.h"
#include <epan/conversation.h>
#include "etypes.h"
#include "nlpid.h"
#define MAX_WIN_BUF_LEN 0x7fff /* storage size for decompressed data */
#define MAX_WCP_BUF_LEN 2048 /* storage size for decompressed data */
#define FROM_DCE 0x80 /* for direction setting */
typedef struct {
guint8 *buf_cur;
guint8 buffer[MAX_WIN_BUF_LEN];
}wcp_window_t;
/*XXX do I really want the length in here */
typedef struct {
guint16 len;
guint8 buffer[MAX_WCP_BUF_LEN];
}wcp_pdata_t;
#define wcp_win_init_count 4
#define wcp_packet_init_count 10
#define wcp_win_length (sizeof(wcp_window_t))
#define wcp_packet_length (sizeof(wcp_pdata_t))
static GMemChunk *wcp_window = NULL;
static GMemChunk *wcp_pdata = NULL;
static int proto_wcp = -1;
static int hf_wcp_cmd = -1;
static int hf_wcp_ext_cmd = -1;
static int hf_wcp_seq = -1;
static int hf_wcp_chksum = -1;
static int hf_wcp_tid = -1;
static int hf_wcp_rev = -1;
static int hf_wcp_init = -1;
static int hf_wcp_seq_size = -1;
static int hf_wcp_alg = -1;
static int hf_wcp_alg_cnt = -1;
static int hf_wcp_alg_a = -1;
static int hf_wcp_alg_b = -1;
static int hf_wcp_alg_c = -1;
static int hf_wcp_alg_d = -1;
static int hf_wcp_rexmit = -1;
static int hf_wcp_hist_size = -1;
static int hf_wcp_ppc = -1;
static int hf_wcp_pib = -1;
static int hf_wcp_comp_bits = -1;
static int hf_wcp_comp_marker = -1;
static int hf_wcp_short_len = -1;
static int hf_wcp_long_len = -1;
static int hf_wcp_short_run = -1;
static int hf_wcp_long_run = -1;
static int hf_wcp_offset = -1;
static gint ett_wcp = -1;
static gint ett_wcp_field = -1;
static dissector_handle_t fr_uncompressed_handle;
/*
* Bits in the address field.
*/
#define WCP_CMD 0xf0 /* WCP Command */
#define WCP_EXT_CMD 0x0f /* WCP Extended Command */
#define WCP_SEQ 0x0fff /* WCP Sequence number */
#define WCP_OFFSET_MASK 0x0fff /* WCP Pattern source offset */
#define PPC_COMPRESSED_IND 0x0
#define PPC_UNCOMPRESSED_IND 0x1
#define PPC_TPPC_COMPRESSED_IND 0x2
#define PPC_TPPC_UNCOMPRESSED_IND 0x3
#define CONNECT_REQ 0x4
#define CONNECT_ACK 0x5
#define CONNECT_NAK 0x6
#define DISCONNECT_REQ 0x7
#define DISCONNECT_ACK 0x8
#define INIT_REQ 0x9
#define INIT_ACK 0xa
#define RESET_REQ 0xb
#define RESET_ACK 0xc
#define REXMIT_NAK 0xd
static const value_string cmd_string[] = {
{0, "Compressed Data"},
{1, "Uncompressed Data"},
{15, "Extended"},
{ 0, NULL }
};
static const value_string ext_cmd_string[] = {
{0, "Per Packet Compression"},
{4, "Connect Req"},
{5, "Connect Ack"},
{9, "Init Req"},
{0x0a, "Init Ack"},
{ 0, NULL }
};
static tvbuff_t *wcp_uncompress( tvbuff_t *src_tvb, int offset, packet_info *pinfo, proto_tree *tree);
static wcp_window_t *get_wcp_window_ptr( packet_info *pinfo);
static void
dissect_wcp_con_req(tvbuff_t *tvb, int offset, proto_tree *tree) {
/* WCP connector request message */
guint alg_cnt = tvb_get_guint8(tvb, 5);
proto_tree_add_uint(tree, hf_wcp_tid, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
proto_tree_add_uint(tree, hf_wcp_rev, tvb, offset + 2, 1, tvb_get_guint8(tvb, offset + 2));
proto_tree_add_uint(tree, hf_wcp_init, tvb, offset + 3, 1, tvb_get_guint8(tvb, offset + 3));
proto_tree_add_uint(tree, hf_wcp_seq_size, tvb, offset + 4, 1, tvb_get_guint8(tvb, offset + 4));
proto_tree_add_uint(tree, hf_wcp_alg_cnt, tvb, offset + 5, 1, alg_cnt);
proto_tree_add_uint(tree, hf_wcp_alg_a, tvb, offset + 6, 1, tvb_get_guint8(tvb, offset + 6));
if ( alg_cnt > 1)
proto_tree_add_uint(tree, hf_wcp_alg_b, tvb, offset + 7, 1, tvb_get_guint8(tvb, offset + 7));
if ( alg_cnt > 2)
proto_tree_add_uint(tree, hf_wcp_alg_c, tvb, offset + 8, 1, tvb_get_guint8(tvb, offset + 8));
if ( alg_cnt > 3)
proto_tree_add_uint(tree, hf_wcp_alg_d, tvb, offset + 9, 1, tvb_get_guint8(tvb, offset + 9));
}
static void
dissect_wcp_con_ack( tvbuff_t *tvb, int offset, proto_tree *tree){
/* WCP connector ack message */
proto_tree_add_uint(tree, hf_wcp_tid, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
proto_tree_add_uint(tree, hf_wcp_rev, tvb, offset + 2, 1, tvb_get_guint8(tvb, offset + 2));
proto_tree_add_uint(tree, hf_wcp_seq_size, tvb, offset + 3, 1, tvb_get_guint8(tvb, offset + 3));
proto_tree_add_uint(tree, hf_wcp_alg, tvb, offset + 4, 1, tvb_get_guint8(tvb, offset + 4));
}
static void
dissect_wcp_init( tvbuff_t *tvb, int offset, proto_tree *tree){
/* WCP Initiate Request/Ack message */
proto_tree_add_uint(tree, hf_wcp_tid, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
proto_tree_add_uint(tree, hf_wcp_rev, tvb, offset + 2, 1, tvb_get_guint8(tvb, offset + 2));
proto_tree_add_uint(tree, hf_wcp_hist_size, tvb, offset + 3, 1, tvb_get_guint8(tvb, offset + 3));
proto_tree_add_uint(tree, hf_wcp_ppc, tvb, offset + 4, 1, tvb_get_guint8(tvb, offset + 4));
proto_tree_add_uint(tree, hf_wcp_pib, tvb, offset + 5, 1, tvb_get_guint8(tvb, offset + 5));
}
static void
dissect_wcp_reset( tvbuff_t *tvb, int offset, proto_tree *tree){
/* Process WCP Reset Request/Ack message */
proto_tree_add_uint(tree, hf_wcp_tid, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
}
static void wcp_save_data( tvbuff_t *tvb, packet_info *pinfo){
wcp_window_t *buf_ptr = 0;
int len;
/* discard first 2 bytes, header and last byte (check byte) */
len = tvb_reported_length( tvb)-3;
buf_ptr = get_wcp_window_ptr( pinfo);
if (( buf_ptr->buf_cur + len) <= (buf_ptr->buffer + MAX_WIN_BUF_LEN)){
tvb_memcpy( tvb, buf_ptr->buf_cur, 2, len);
buf_ptr->buf_cur = buf_ptr->buf_cur + len;
} else {
guint8 *buf_end = buf_ptr->buffer + MAX_WIN_BUF_LEN;
tvb_memcpy( tvb, buf_ptr->buf_cur, 2, buf_end - buf_ptr->buf_cur);
tvb_memcpy( tvb, buf_ptr->buffer, buf_end - buf_ptr->buf_cur-2,
len - (int)(buf_end - buf_ptr->buf_cur));
buf_ptr->buf_cur = buf_ptr->buf_cur + len - MAX_WIN_BUF_LEN;
}
}
static void dissect_wcp( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
proto_tree *wcp_tree;
proto_item *ti;
int wcp_header_len;
guint16 temp, cmd, ext_cmd, seq;
tvbuff_t *next_tvb;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "WCP");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
temp =tvb_get_ntohs(tvb, 0);
cmd = (temp & 0xf000) >> 12;
ext_cmd = (temp & 0x0f00) >> 8;
if ( cmd == 0xf)
wcp_header_len= 1;
else
wcp_header_len= 2;
seq = temp & 0x0fff;
/*XXX should test seq to be sure it the last + 1 !! */
if (check_col(pinfo->cinfo, COL_INFO)){
col_add_str(pinfo->cinfo, COL_INFO, val_to_str(cmd, cmd_string, "Unknown"));
if ( cmd == 0xf)
col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
val_to_str(ext_cmd, ext_cmd_string, "Unknown"));
}
if (tree) {
ti = proto_tree_add_item(tree, proto_wcp, tvb, 0, wcp_header_len, FALSE);
wcp_tree = proto_item_add_subtree(ti, ett_wcp);
proto_tree_add_uint(wcp_tree, hf_wcp_cmd, tvb, 0, 1, tvb_get_guint8( tvb, 0));
if ( cmd == 0xf){
proto_tree_add_uint(wcp_tree, hf_wcp_ext_cmd, tvb, 1, 1,
tvb_get_guint8( tvb, 0));
switch (ext_cmd){
case CONNECT_REQ:
dissect_wcp_con_req( tvb, 1, wcp_tree);
break;
case CONNECT_ACK:
dissect_wcp_con_ack( tvb, 1, wcp_tree);
break;
case INIT_REQ:
case INIT_ACK:
dissect_wcp_init( tvb, 1, wcp_tree);
break;
case RESET_REQ:
case RESET_ACK:
dissect_wcp_reset( tvb, 1, wcp_tree);
break;
default:
break;
}
}else {
proto_tree_add_uint(wcp_tree, hf_wcp_seq, tvb, 0, 2, seq);
}
}
else {
wcp_tree = NULL;
}
/* exit if done */
if ( cmd != 1 && cmd != 0 && !(cmd == 0xf && ext_cmd == 0))
return;
if ( cmd == 1) { /* uncompressed data */
if ( !pinfo->fd->flags.visited){ /* if first pass */
wcp_save_data( tvb, pinfo);
}
next_tvb = tvb_new_subset(tvb, wcp_header_len, -1, -1);
}
else { /* cmd == 0 || (cmd == 0xf && ext_cmd == 0) */
next_tvb = wcp_uncompress( tvb, wcp_header_len, pinfo, wcp_tree);
if ( !next_tvb){
proto_tree_add_protocol_format(tree, proto_malformed, tvb, 0, 0,
"[Malformed Frame: Bad WCP compressed data]" );
return;
}
}
if ( tree) /* add the check byte */
proto_tree_add_uint(wcp_tree, hf_wcp_chksum, tvb,
tvb_reported_length( tvb)-1, 1,
tvb_get_guint8( tvb, tvb_reported_length(tvb)-1));
call_dissector(fr_uncompressed_handle, next_tvb, pinfo, tree);
return;
}
static guint8 *decompressed_entry( guint8 *src, guint8 *dst, int *len, guint8 * buf_start, guint8 *buf_end){
/* do the decompression for one field */
guint16 data_offset, data_cnt;
guint8 tmp = *src;
data_offset = (*(src++) & 0xf) << 8; /* get high byte */
data_offset += *(src++); /* add next byte */
if (( tmp & 0xf0) == 0x10){ /* 2 byte count */
data_cnt = *src;
data_cnt++;
}else { /* one byte count */
data_cnt = tmp >> 4;
data_cnt++;
}
src = (dst - 1 - data_offset);
if ( src < buf_start)
src += MAX_WIN_BUF_LEN;
/*XXX could do some fancy memory moves, later if speed is problem */
while( data_cnt--){
*dst = *src;
if ( ++(*len) >MAX_WCP_BUF_LEN){
printf("decomp failed, len = %d\n", *len);
return NULL; /* end of buffer error */
}
if ( dst++ == buf_end)
dst = buf_start;
if ( src++ == buf_end)
src = buf_start;
}
return dst;
}
static
wcp_window_t *get_wcp_window_ptr( packet_info *pinfo){
/* find the conversation for this side of the DLCI, create one if needed */
/* and return the wcp_window data structure pointer */
conversation_t *conv;
wcp_window_t *wcp_win_data;
conv = find_conversation( &pinfo->dl_src, &pinfo->dl_src, PT_NONE,
((pinfo->pseudo_header->x25.flags & FROM_DCE)? 1:0),
((pinfo->pseudo_header->x25.flags & FROM_DCE)? 1:0), 0);
if ( !conv){
conv = conversation_new( &pinfo->dl_src, &pinfo->dl_src, PT_NONE,
((pinfo->pseudo_header->x25.flags & FROM_DCE)? 1:0),
((pinfo->pseudo_header->x25.flags & FROM_DCE)? 1:0),
0);
}
wcp_win_data = conversation_get_proto_data(conv, proto_wcp);
if ( !wcp_win_data){
wcp_win_data = g_mem_chunk_alloc( wcp_window);
wcp_win_data->buf_cur = wcp_win_data->buffer;
conversation_add_proto_data(conv, proto_wcp, wcp_win_data);
}
return wcp_win_data;
}
static tvbuff_t *wcp_uncompress( tvbuff_t *src_tvb, int offset, packet_info *pinfo, proto_tree *tree) {
/* do the packet data uncompression and load it into the dst buffer */
proto_tree *sub_tree;
proto_item *ti;
int len=0, i = -1;
int cnt = tvb_reported_length( src_tvb)-1; /* don't include check byte */
guint8 *buf = 0, *dst, *src, *buf_start, *buf_end, *tmp, comp_flag_bits = 0;
guint8 src_buf[ MAX_WCP_BUF_LEN];
tvbuff_t *volatile tvb = 0;
wcp_window_t *buf_ptr = 0;
wcp_pdata_t *volatile pdata_ptr;
buf_ptr = get_wcp_window_ptr( pinfo);
buf_start = buf_ptr->buffer;
buf_end = buf_start + MAX_WIN_BUF_LEN;
tmp = buf_ptr->buf_cur;
if (cnt - offset > MAX_WCP_BUF_LEN) {
if (tree)
proto_tree_add_text( tree, src_tvb, offset, -1,
"Compressed data exceeds maximum buffer length (%d > %d)",
cnt - offset, MAX_WCP_BUF_LEN);
return NULL;
}
src = tvb_memcpy(src_tvb, src_buf, offset, cnt - offset);
dst = buf_ptr->buf_cur;
while( offset++ < cnt){
if ( --i >= 0){
if ( comp_flag_bits & 0x80){ /* if this is a compressed entry */
if ( !pinfo->fd->flags.visited){ /* if first pass */
dst = decompressed_entry( src, dst, &len, buf_start, buf_end);
}
if ((*src & 0xf0) == 0x10){
if ( tree) {
ti = proto_tree_add_item( tree, hf_wcp_long_run, src_tvb,
offset-1, 3, 0);
sub_tree = proto_item_add_subtree(ti, ett_wcp_field);
proto_tree_add_uint(sub_tree, hf_wcp_offset, src_tvb,
offset-1, 2, pntohs(src));
proto_tree_add_item( sub_tree, hf_wcp_long_len, src_tvb,
offset+1, 1, pntohs(src));
}
src += 3;
offset += 2;
}else{
if ( tree) {
ti = proto_tree_add_item( tree, hf_wcp_short_run, src_tvb,
offset - 1, 2, *src);
sub_tree = proto_item_add_subtree(ti, ett_wcp_field);
proto_tree_add_item( sub_tree, hf_wcp_short_len, src_tvb,
offset-1, 1, *src);
proto_tree_add_uint(sub_tree, hf_wcp_offset, src_tvb,
offset-1, 2, pntohs(src));
}
src += 2;
offset += 1;
}
}else {
if ( !pinfo->fd->flags.visited){ /* if first pass */
*dst = *src;
if ( dst++ == buf_end)
dst = buf_start;
}
++src;
++len;
}
if ( len >MAX_WCP_BUF_LEN){
return NULL;
}
comp_flag_bits <<= 1;
}else { /* compressed data flag */
comp_flag_bits = *src++;
if (tree)
proto_tree_add_uint( tree, hf_wcp_comp_bits, src_tvb, offset-1, 1,
comp_flag_bits);
i = 8;
}
}
if ( pinfo->fd->flags.visited){ /* if not first pass */
/* get uncompressed data */
pdata_ptr = p_get_proto_data( pinfo->fd, proto_wcp);
if ( !pdata_ptr) /* exit if no data */
return NULL;
len = pdata_ptr->len;
} else {
/* save the new data as per packet data */
pdata_ptr = g_mem_chunk_alloc( wcp_pdata);
memcpy( &pdata_ptr->buffer, buf_ptr->buf_cur, len);
pdata_ptr->len = len;
p_add_proto_data( pinfo->fd, proto_wcp, (void*)pdata_ptr);
buf_ptr->buf_cur = dst;
}
TRY {
tvb = tvb_new_real_data( pdata_ptr->buffer, pdata_ptr->len, pdata_ptr->len);
}
CATCH(BoundsError) {
g_assert_not_reached();
g_free(buf);
return NULL;
}
CATCH(ReportedBoundsError) {
g_free(buf);
return NULL;
}
ENDTRY;
/* link new tvbuff into tvbuff chain so cleanup is done later */
tvb_set_child_real_data_tvbuff( src_tvb, tvb);
/* Add new data to the data source list */
add_new_data_source( pinfo, tvb, "Uncompressed WCP");
return tvb;
}
static void wcp_reinit( void){
/* Do the cleanup work when a new pass through the packet list is */
/* performed. re-initialize the memory chunks. */
if (wcp_window)
g_mem_chunk_destroy(wcp_window);
wcp_window = g_mem_chunk_new("wcp_window", wcp_win_length,
wcp_win_init_count * wcp_win_length,
G_ALLOC_AND_FREE);
if (wcp_pdata)
g_mem_chunk_destroy(wcp_pdata);
wcp_pdata = g_mem_chunk_new("wcp_pdata", wcp_packet_length,
wcp_packet_init_count * wcp_packet_length,
G_ALLOC_AND_FREE);
}
void
proto_register_wcp(void)
{
static hf_register_info hf[] = {
{ &hf_wcp_cmd,
{ "Command", "wcp.cmd", FT_UINT8, BASE_HEX, VALS(cmd_string), WCP_CMD,
"Compression Command", HFILL }},
{ &hf_wcp_ext_cmd,
{ "Extended Command", "wcp.ext_cmd", FT_UINT8, BASE_HEX, VALS(ext_cmd_string), WCP_EXT_CMD,
"Extended Compression Command", HFILL }},
{ &hf_wcp_seq,
{ "SEQ", "wcp.seq", FT_UINT16, BASE_HEX, NULL, WCP_SEQ,
"Sequence Number", HFILL }},
{ &hf_wcp_chksum,
{ "Checksum", "wcp.checksum", FT_UINT8, BASE_DEC, NULL, 0,
"Packet Checksum", HFILL }},
{ &hf_wcp_tid,
{ "TID", "wcp.tid", FT_UINT16, BASE_DEC, NULL, 0,
"TID", HFILL }},
{ &hf_wcp_rev,
{ "Revision", "wcp.rev", FT_UINT8, BASE_DEC, NULL, 0,
"Revision", HFILL }},
{ &hf_wcp_init,
{ "Initiator", "wcp.init", FT_UINT8, BASE_DEC, NULL, 0,
"Initiator", HFILL }},
{ &hf_wcp_seq_size,
{ "Seq Size", "wcp.seq_size", FT_UINT8, BASE_DEC, NULL, 0,
"Sequence Size", HFILL }},
{ &hf_wcp_alg_cnt,
{ "Alg Count", "wcp.alg_cnt", FT_UINT8, BASE_DEC, NULL, 0,
"Algorithm Count", HFILL }},
{ &hf_wcp_alg_a,
{ "Alg 1", "wcp.alg1", FT_UINT8, BASE_DEC, NULL, 0,
"Algorithm #1", HFILL }},
{ &hf_wcp_alg_b,
{ "Alg 2", "wcp.alg2", FT_UINT8, BASE_DEC, NULL, 0,
"Algorithm #2", HFILL }},
{ &hf_wcp_alg_c,
{ "Alg 3", "wcp.alg3", FT_UINT8, BASE_DEC, NULL, 0,
"Algorithm #3", HFILL }},
{ &hf_wcp_alg_d,
{ "Alg 4", "wcp.alg4", FT_UINT8, BASE_DEC, NULL, 0,
"Algorithm #4", HFILL }},
{ &hf_wcp_alg,
{ "Alg", "wcp.alg", FT_UINT8, BASE_DEC, NULL, 0,
"Algorithm", HFILL }},
{ &hf_wcp_rexmit,
{ "Rexmit", "wcp.rexmit", FT_UINT8, BASE_DEC, NULL, 0,
"Retransmit", HFILL }},
{ &hf_wcp_hist_size,
{ "History", "wcp.hist", FT_UINT8, BASE_DEC, NULL, 0,
"History Size", HFILL }},
{ &hf_wcp_ppc,
{ "PerPackComp", "wcp.ppc", FT_UINT8, BASE_DEC, NULL, 0,
"Per Packet Compression", HFILL }},
{ &hf_wcp_pib,
{ "PIB", "wcp.pib", FT_UINT8, BASE_DEC, NULL, 0,
"PIB", HFILL }},
{ &hf_wcp_comp_bits,
{ "Compress Flag", "wcp.flag", FT_UINT8, BASE_HEX, NULL, 0,
"Compressed byte flag", HFILL }},
{ &hf_wcp_comp_marker,
{ "Compress Marker", "wcp.mark", FT_UINT8, BASE_BIN, NULL, 0,
"Compressed marker", HFILL }},
{ &hf_wcp_offset,
{ "Source offset", "wcp.off", FT_UINT16, BASE_HEX, NULL, WCP_OFFSET_MASK,
"Data source offset", HFILL }},
{ &hf_wcp_short_len,
{ "Compress Length", "wcp.short_len", FT_UINT8, BASE_HEX, NULL, 0xf0,
"Compressed length", HFILL }},
{ &hf_wcp_long_len,
{ "Compress Length", "wcp.long_len", FT_UINT8, BASE_HEX, NULL, 0,
"Compressed length", HFILL }},
{ &hf_wcp_long_run,
{ "Long Compression", "wcp.long_comp", FT_UINT16, BASE_HEX, NULL, 0,
"Long Compression type", HFILL }},
{ &hf_wcp_short_run,
{ "Short Compression", "wcp.short_comp", FT_UINT8, BASE_HEX, NULL, 0,
"Short Compression type", HFILL }},
};
static gint *ett[] = {
&ett_wcp,
&ett_wcp_field,
};
proto_wcp = proto_register_protocol ("Wellfleet Compression", "WCP", "wcp");
proto_register_field_array (proto_wcp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_init_routine(&wcp_reinit);
}
void
proto_reg_handoff_wcp(void) {
dissector_handle_t wcp_handle;
/*
* Get handle for the Frame Relay (uncompressed) dissector.
*/
fr_uncompressed_handle = find_dissector("fr_uncompressed");
wcp_handle = create_dissector_handle(dissect_wcp, proto_wcp);
dissector_add("fr.ietf", NLPID_COMPRESSED, wcp_handle);
dissector_add("ethertype", ETHERTYPE_WCP, wcp_handle);
}
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