![Guy Harris](/assets/img/avatar_default.png)
dynamically-assigned "ett_" integer values, assigned by "proto_register_subtree_array()"; this: obviates the need to update "packet.h" whenever you add a new subtree type - you only have to add a call to "proto_register_subtree_array()" to a "register" routine and an array of pointers to "ett_", if they're not already there, and add a pointer to the new "ett_" variable to the array, if they are there; would allow run-time-loaded dissectors to allocate subtree types when they're loaded. svn path=/trunk/; revision=1043
127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/* packet-lapb.c
|
|
* Routines for lapb frame disassembly
|
|
* Olivier Abad <abad@daba.dhis.org>
|
|
*
|
|
* $Id: packet-lapb.c,v 1.8 1999/11/16 11:42:37 guy Exp $
|
|
*
|
|
* Ethereal - Network traffic analyzer
|
|
* By Gerald Combs <gerald@zing.org>
|
|
* 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.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#ifdef HAVE_SYS_TYPES_H
|
|
# include <sys/types.h>
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <glib.h>
|
|
#include <string.h>
|
|
#include "packet.h"
|
|
#include "xdlc.h"
|
|
|
|
#define FROM_DCE 0x80
|
|
|
|
static int proto_lapb = -1;
|
|
static int hf_lapb_address = -1;
|
|
static int hf_lapb_control = -1;
|
|
|
|
static gint ett_lapb = -1;
|
|
static gint ett_lapb_control = -1;
|
|
|
|
void
|
|
dissect_lapb(const u_char *pd, frame_data *fd, proto_tree *tree)
|
|
{
|
|
proto_tree *lapb_tree, *ti;
|
|
int is_response;
|
|
|
|
if (check_col(fd, COL_PROTOCOL))
|
|
col_add_str(fd, COL_PROTOCOL, "LAPB");
|
|
|
|
if(check_col(fd, COL_RES_DL_SRC))
|
|
col_add_fstr(fd, COL_RES_DL_SRC, "0x%02X", pd[0]);
|
|
if (pd[0] != 0x01 && pd[0] != 0x03) /* invalid LAPB frame */
|
|
{
|
|
if (check_col(fd, COL_INFO))
|
|
col_add_str(fd, COL_INFO, "Invalid LAPB frame");
|
|
if (tree)
|
|
ti = proto_tree_add_item_format(tree, proto_lapb, 0, fd->cap_len,
|
|
NULL, "Invalid LAPB frame");
|
|
return;
|
|
}
|
|
|
|
if (fd->pseudo_header.x25.flags & FROM_DCE) {
|
|
if(check_col(fd, COL_RES_DL_DST))
|
|
col_add_str(fd, COL_RES_DL_DST, "DTE");
|
|
if(check_col(fd, COL_RES_DL_SRC))
|
|
col_add_str(fd, COL_RES_DL_SRC, "DCE");
|
|
}
|
|
else {
|
|
if(check_col(fd, COL_RES_DL_DST))
|
|
col_add_str(fd, COL_RES_DL_DST, "DCE");
|
|
if(check_col(fd, COL_RES_DL_SRC))
|
|
col_add_str(fd, COL_RES_DL_SRC, "DTE");
|
|
}
|
|
|
|
if (((fd->pseudo_header.x25.flags & FROM_DCE) && pd[0] == 0x01) ||
|
|
(!(fd->pseudo_header.x25.flags & FROM_DCE) && pd[0] == 0x03))
|
|
is_response = TRUE;
|
|
else
|
|
is_response = FALSE;
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item_format(tree, proto_lapb, 0, 2, NULL,
|
|
"LAPB");
|
|
lapb_tree = proto_item_add_subtree(ti, ett_lapb);
|
|
proto_tree_add_item_format(lapb_tree, hf_lapb_address, 0, 1, pd[0],
|
|
"Address: 0x%02X", pd[0]);
|
|
}
|
|
else
|
|
lapb_tree = NULL;
|
|
dissect_xdlc_control(pd, 1, fd, lapb_tree, hf_lapb_control,
|
|
ett_lapb_control, is_response, FALSE);
|
|
|
|
/* not end of frame ==> X.25 */
|
|
if (fd->cap_len > 2) dissect_x25(pd, 2, fd, tree);
|
|
}
|
|
|
|
void
|
|
proto_register_lapb(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_lapb_address,
|
|
{ "Address Field", "lapb.address", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_lapb_control,
|
|
{ "Control Field", "lapb.control", FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_lapb,
|
|
&ett_lapb_control,
|
|
};
|
|
|
|
proto_lapb = proto_register_protocol ("Link Access Procedure Balanced (LAPB)", "lapb");
|
|
proto_register_field_array (proto_lapb, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|