osmith/wireshark
1
0
Fork 0
forked from osmocom/wireshark
Code Pull requests Releases Wiki Activity
wireshark/packet-v120.c
Guy Harris 79e1fdb9e5 Remove more "CHECK_DISPLAY_AS_DATA()" calls and "pinfo->current_proto =" 
statements.

Move the setting of the Protocol column in the Appletalk ARP and IPX
dissectors before anything is fetched from the packet, and also clear
the Info column at that point in those and some other dissectors, so
that if an exception is thrown, the columns don't reflect the previous
protocol.

Fix the registration of the IPX RIP dissector to use the right protocol
ID.

svn path=/trunk/; revision=2928
2001-01-22 00:20:29 +00:00

239 lines
7.4 KiB
C
Raw Blame History

/* packet-v120.c
* Routines for v120 frame disassembly
* Bert Driehuis <driehuis@playbeing.org>
*
* $Id: packet-v120.c,v 1.18 2001/01/22 00:20:29 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_v120 = -1;
static int hf_v120_address = -1;
static int hf_v120_control = -1;
static int hf_v120_header = -1;
static gint ett_v120 = -1;
static gint ett_v120_address = -1;
static gint ett_v120_control = -1;
static gint ett_v120_header = -1;
static int dissect_v120_header(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree);
static void
dissect_v120(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *v120_tree, *tc, *address_tree;
proto_item *ti;
int is_response;
int addr;
char info[80];
int v120len;
guint8 byte0, byte1;
guint16 control;
tvbuff_t *next_tvb;
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "V.120");
if (check_col(pinfo->fd, COL_INFO))
col_clear(pinfo->fd, COL_INFO);
byte0 = tvb_get_guint8(tvb, 0);
if(check_col(pinfo->fd, COL_RES_DL_SRC))
col_add_fstr(pinfo->fd, COL_RES_DL_SRC, "0x%02X", byte0);
byte1 = tvb_get_guint8(tvb, 1);
if ((byte0 & 0x01) != 0x00 && (byte1 && 0x01) != 0x01)
{
if (check_col(pinfo->fd, COL_INFO))
col_set_str(pinfo->fd, COL_INFO, "Invalid V.120 frame");
if (tree)
ti = proto_tree_add_protocol_format(tree, proto_v120, tvb, 0, tvb_length(tvb),
"Invalid V.120 frame");
return;
}
if (pinfo->pseudo_header->x25.flags & FROM_DCE) {
if(check_col(pinfo->fd, COL_RES_DL_DST))
col_set_str(pinfo->fd, COL_RES_DL_DST, "DTE");
if(check_col(pinfo->fd, COL_RES_DL_SRC))
col_set_str(pinfo->fd, COL_RES_DL_SRC, "DCE");
}
else {
if(check_col(pinfo->fd, COL_RES_DL_DST))
col_set_str(pinfo->fd, COL_RES_DL_DST, "DCE");
if(check_col(pinfo->fd, COL_RES_DL_SRC))
col_set_str(pinfo->fd, COL_RES_DL_SRC, "DTE");
}
if (((pinfo->pseudo_header->x25.flags & FROM_DCE) && byte0 & 0x02) ||
(!(pinfo->pseudo_header->x25.flags & FROM_DCE) && !(byte0 & 0x02)))
is_response = TRUE;
else
is_response = FALSE;
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_v120, tvb, 0, 0, "V.120");
v120_tree = proto_item_add_subtree(ti, ett_v120);
addr = byte1 << 8 | byte0;
sprintf(info, "LLI: %d C/R: %s",
((byte0 & 0xfc) << 5) | ((byte1 & 0xfe) >> 1),
byte0 & 0x02 ? "R" : "C");
tc = proto_tree_add_text(v120_tree, tvb,
0, 2,
"Address field: %s", info);
address_tree = proto_item_add_subtree(tc, ett_v120_address);
proto_tree_add_text(address_tree, tvb, 0, 2,
decode_boolean_bitfield(addr, 0x0002, 2*8,
"Response", "Command"), NULL);
sprintf(info, "LLI: %d", ((byte0 & 0xfc) << 5) | ((byte1 & 0xfe) >> 1));
proto_tree_add_text(address_tree, tvb, 0, 2,
decode_numeric_bitfield(addr, 0xfefc, 2*8, info));
proto_tree_add_text(address_tree, tvb, 0, 2,
decode_boolean_bitfield(addr, 0x0001, 2*8,
"EA0 = 1 (Error)", "EA0 = 0"), NULL);
proto_tree_add_text(address_tree, tvb, 0, 2,
decode_boolean_bitfield(addr, 0x0100, 2*8,
"EA1 = 1", "EA1 = 0 (Error)"), NULL);
}
else {
v120_tree = NULL;
ti = NULL;
}
control = dissect_xdlc_control(tvb, 2, pinfo, v120_tree, hf_v120_control,
ett_v120_control, is_response, TRUE);
if (tree) {
v120len = 2 + XDLC_CONTROL_LEN(control, TRUE);
if (tvb_bytes_exist(tvb, v120len, 1))
v120len += dissect_v120_header(tvb, v120len, pinfo, v120_tree);
proto_item_set_len(ti, v120len);
next_tvb = tvb_new_subset(tvb, v120len, -1, -1);
dissect_data(next_tvb, 0, pinfo, v120_tree);
}
}
static int
dissect_v120_header(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
char info[80];
int header_len, nbits;
int header;
proto_tree *h_tree, *tc;
guint8 byte0;
byte0 = tvb_get_guint8(tvb, offset);
if (byte0 & 0x80) {
header_len = 1;
header = byte0;
} else {
header_len = 2;
header = byte0 | tvb_get_guint8(tvb, offset + 1) << 8;
}
nbits = header_len * 8;
sprintf(info, "Header: B: %d F: %d", byte0 & 0x02 ? 1:0,
byte0 & 0x01 ? 1:0);
tc = proto_tree_add_text(tree, tvb,
offset, header_len,
"Header octet: %s (0x%02X)", info, byte0);
h_tree = proto_item_add_subtree(tc, ett_v120_header);
proto_tree_add_text(h_tree, tvb, offset, header_len,
decode_boolean_bitfield(header, 0x80, nbits,
"No extension octet", "Extension octet follows"), NULL);
proto_tree_add_text(h_tree, tvb, offset, header_len,
decode_boolean_bitfield(header, 0x40, nbits,
"Break condition", "No break condition"), NULL);
sprintf(info, "Error control C1/C2: %d", (header & 0x0c) >> 2);
proto_tree_add_text(h_tree, tvb, offset, header_len,
decode_numeric_bitfield(header, 0x0c, nbits, info));
proto_tree_add_text(h_tree, tvb, offset, header_len,
decode_boolean_bitfield(header, 0x02, nbits,
"Segmentation bit B", "No segmentation bit B"), NULL);
proto_tree_add_text(h_tree, tvb, offset, header_len,
decode_boolean_bitfield(header, 0x01, nbits,
"Segmentation bit F", "No segmentation bit F"), NULL);
if (header_len == 2) {
proto_tree_add_text(h_tree, tvb, offset, header_len,
decode_boolean_bitfield(header, 0x8000, nbits,
"E", "E bit not set (Error)"), NULL);
proto_tree_add_text(h_tree, tvb, offset, header_len,
decode_boolean_bitfield(header, 0x4000, nbits,
"DR", "No DR"), NULL);
proto_tree_add_text(h_tree, tvb, offset, header_len,
decode_boolean_bitfield(header, 0x2000, nbits,
"SR", "No SR"), NULL);
proto_tree_add_text(h_tree, tvb, offset, header_len,
decode_boolean_bitfield(header, 0x1000, nbits,
"RR", "No RR"), NULL);
}
return header_len;
}
void
proto_register_v120(void)
{
static hf_register_info hf[] = {
{ &hf_v120_address,
{ "Link Address", "v120.address", FT_UINT16, BASE_HEX, NULL,
0x0, "" }},
{ &hf_v120_control,
{ "Control Field", "v120.control", FT_UINT16, BASE_HEX, NULL, 0x0,
"" }},
{ &hf_v120_header,
{ "Header Field", "v120.header", FT_STRING, BASE_NONE, NULL, 0x0,
"" }},
};
static gint *ett[] = {
&ett_v120,
&ett_v120_address,
&ett_v120_control,
&ett_v120_header,
};
proto_v120 = proto_register_protocol("Async data over ISDN (V.120)",
"V.120", "v120");
proto_register_field_array (proto_v120, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_v120(void)
{
dissector_add("wtap_encap", WTAP_ENCAP_V120, dissect_v120,
proto_v120);
}
View git blame Copy permalink