![Richard Sharpe](/assets/img/avatar_default.png)
the capture I was sent as a bunch of TCP segments containing LPD stuff. svn path=/trunk/; revision=6810
319 lines
9.3 KiB
C
319 lines
9.3 KiB
C
/* packet-frame.c
|
|
*
|
|
* Top-most dissector. Decides dissector based on Wiretap Encapsulation Type.
|
|
*
|
|
* $Id: packet-frame.c,v 1.33 2002/12/20 07:56:07 sharpe Exp $
|
|
*
|
|
* Ethereal - Network traffic analyzer
|
|
* By Gerald Combs <gerald@ethereal.com>
|
|
* Copyright 2000 Gerald Combs
|
|
*
|
|
* 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
|
|
|
|
#include <glib.h>
|
|
#include <epan/packet.h>
|
|
#include <epan/timestamp.h>
|
|
#include <epan/tvbuff.h>
|
|
#include "packet-frame.h"
|
|
#include "prefs.h"
|
|
#include "tap.h"
|
|
|
|
static int proto_frame = -1;
|
|
static int hf_frame_arrival_time = -1;
|
|
static int hf_frame_time_delta = -1;
|
|
static int hf_frame_time_relative = -1;
|
|
static int hf_frame_number = -1;
|
|
static int hf_frame_packet_len = -1;
|
|
static int hf_frame_capture_len = -1;
|
|
static int hf_frame_p2p_dir = -1;
|
|
static int hf_frame_file_off = -1;
|
|
static int hf_frame_marked = -1;
|
|
|
|
static int proto_short = -1;
|
|
int proto_malformed = -1;
|
|
static int proto_unreassembled = -1;
|
|
|
|
static gint ett_frame = -1;
|
|
|
|
static int frame_tap = -1;
|
|
|
|
static dissector_handle_t data_handle;
|
|
static dissector_handle_t docsis_handle;
|
|
|
|
/* Preferences */
|
|
static gboolean show_file_off = FALSE;
|
|
static gboolean force_docsis_encap;
|
|
|
|
static const value_string p2p_dirs[] = {
|
|
{ P2P_DIR_SENT, "Sent" },
|
|
{ P2P_DIR_RECV, "Received" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static dissector_table_t wtap_encap_dissector_table;
|
|
|
|
static void
|
|
dissect_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_tree *fh_tree;
|
|
proto_item *ti;
|
|
nstime_t ts;
|
|
int cap_len, pkt_len;
|
|
|
|
pinfo->current_proto = "Frame";
|
|
|
|
if (pinfo->pseudo_header != NULL) {
|
|
switch (pinfo->fd->lnk_t) {
|
|
|
|
case WTAP_ENCAP_WFLEET_HDLC:
|
|
case WTAP_ENCAP_CHDLC:
|
|
case WTAP_ENCAP_PPP_WITH_PHDR:
|
|
pinfo->p2p_dir = pinfo->pseudo_header->p2p.sent ?
|
|
P2P_DIR_SENT : P2P_DIR_RECV;
|
|
break;
|
|
|
|
case WTAP_ENCAP_LAPB:
|
|
case WTAP_ENCAP_FRELAY:
|
|
pinfo->p2p_dir =
|
|
(pinfo->pseudo_header->x25.flags & FROM_DCE) ?
|
|
P2P_DIR_RECV : P2P_DIR_SENT;
|
|
break;
|
|
|
|
case WTAP_ENCAP_ISDN:
|
|
pinfo->p2p_dir = pinfo->pseudo_header->isdn.uton ?
|
|
P2P_DIR_SENT : P2P_DIR_RECV;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ((force_docsis_encap) && (docsis_handle)) {
|
|
/*
|
|
* XXX - setting it here makes it impossible to
|
|
* turn the "Treat all frames as DOCSIS frames"
|
|
* option off.
|
|
*
|
|
* The TCP Graph code currently uses "fd->lnk_t";
|
|
* it should eventually just get the information
|
|
* it needs from a full-blown dissection, so that
|
|
* can handle any link-layer type.
|
|
*/
|
|
pinfo->fd->lnk_t = WTAP_ENCAP_DOCSIS;
|
|
}
|
|
|
|
/* Put in frame header information. */
|
|
if (tree) {
|
|
|
|
cap_len = tvb_length(tvb);
|
|
pkt_len = tvb_reported_length(tvb);
|
|
|
|
ti = proto_tree_add_protocol_format(tree, proto_frame, tvb, 0, -1,
|
|
"Frame %u (%u bytes on wire, %u bytes captured)", pinfo->fd->num, pkt_len, cap_len);
|
|
|
|
fh_tree = proto_item_add_subtree(ti, ett_frame);
|
|
|
|
proto_tree_add_boolean_hidden(fh_tree, hf_frame_marked, tvb, 0, 0,pinfo->fd->flags.marked);
|
|
|
|
ts.secs = pinfo->fd->abs_secs;
|
|
ts.nsecs = pinfo->fd->abs_usecs*1000;
|
|
|
|
proto_tree_add_time(fh_tree, hf_frame_arrival_time, tvb,
|
|
0, 0, &ts);
|
|
|
|
ts.secs = pinfo->fd->del_secs;
|
|
ts.nsecs = pinfo->fd->del_usecs*1000;
|
|
|
|
proto_tree_add_time(fh_tree, hf_frame_time_delta, tvb,
|
|
0, 0, &ts);
|
|
|
|
ts.secs = pinfo->fd->rel_secs;
|
|
ts.nsecs = pinfo->fd->rel_usecs*1000;
|
|
|
|
proto_tree_add_time(fh_tree, hf_frame_time_relative, tvb,
|
|
0, 0, &ts);
|
|
|
|
proto_tree_add_uint(fh_tree, hf_frame_number, tvb,
|
|
0, 0, pinfo->fd->num);
|
|
|
|
proto_tree_add_uint_format(fh_tree, hf_frame_packet_len, tvb,
|
|
0, 0, pkt_len, "Packet Length: %d byte%s", pkt_len,
|
|
plurality(pkt_len, "", "s"));
|
|
|
|
proto_tree_add_uint_format(fh_tree, hf_frame_capture_len, tvb,
|
|
0, 0, cap_len, "Capture Length: %d byte%s", cap_len,
|
|
plurality(cap_len, "", "s"));
|
|
|
|
/* Check for existences of P2P pseudo header */
|
|
if (pinfo->p2p_dir != P2P_DIR_UNKNOWN) {
|
|
proto_tree_add_uint(fh_tree, hf_frame_p2p_dir, tvb,
|
|
0, 0, pinfo->p2p_dir);
|
|
}
|
|
|
|
if (show_file_off) {
|
|
proto_tree_add_int_format(fh_tree, hf_frame_file_off, tvb,
|
|
0, 0, pinfo->fd->file_off,
|
|
"File Offset: %ld (0x%lx)",
|
|
pinfo->fd->file_off, pinfo->fd->file_off);
|
|
}
|
|
}
|
|
|
|
|
|
TRY {
|
|
if (!dissector_try_port(wtap_encap_dissector_table, pinfo->fd->lnk_t,
|
|
tvb, pinfo, tree)) {
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "UNKNOWN");
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "WTAP_ENCAP = %u",
|
|
pinfo->fd->lnk_t);
|
|
call_dissector(data_handle,tvb, pinfo, tree);
|
|
}
|
|
}
|
|
CATCH(BoundsError) {
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_str(pinfo->cinfo, COL_INFO, "[Short Frame]");
|
|
proto_tree_add_protocol_format(tree, proto_short, tvb, 0, 0,
|
|
"[Short Frame: %s]", pinfo->current_proto);
|
|
}
|
|
CATCH(ReportedBoundsError) {
|
|
show_reported_bounds_error(tvb, pinfo, tree);
|
|
}
|
|
ENDTRY;
|
|
|
|
tap_queue_packet(frame_tap, pinfo, NULL);
|
|
}
|
|
|
|
void
|
|
show_reported_bounds_error(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
if (pinfo->fragmented) {
|
|
/*
|
|
* We were dissecting an unreassembled fragmented
|
|
* packet when the exception was thrown, so the
|
|
* problem isn't that the dissector expected
|
|
* something but it wasn't in the packet, the
|
|
* problem is that the dissector expected something
|
|
* but it wasn't in the fragment we dissected.
|
|
*/
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_str(pinfo->cinfo, COL_INFO,
|
|
"[Unreassembled Packet]");
|
|
proto_tree_add_protocol_format(tree, proto_unreassembled,
|
|
tvb, 0, 0, "[Unreassembled Packet: %s]",
|
|
pinfo->current_proto);
|
|
} else {
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_str(pinfo->cinfo, COL_INFO,
|
|
"[Malformed Packet]");
|
|
proto_tree_add_protocol_format(tree, proto_malformed,
|
|
tvb, 0, 0, "[Malformed Packet: %s]", pinfo->current_proto);
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_frame(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_frame_arrival_time,
|
|
{ "Arrival Time", "frame.time", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_frame_time_delta,
|
|
{ "Time delta from previous packet", "frame.time_delta", FT_RELATIVE_TIME, BASE_NONE, NULL,
|
|
0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_frame_time_relative,
|
|
{ "Time relative to first packet", "frame.time_relative", FT_RELATIVE_TIME, BASE_NONE, NULL,
|
|
0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_frame_number,
|
|
{ "Frame Number", "frame.number", FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_frame_packet_len,
|
|
{ "Total Frame Length", "frame.pkt_len", FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_frame_capture_len,
|
|
{ "Capture Frame Length", "frame.cap_len", FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_frame_p2p_dir,
|
|
{ "Point-to-Point Direction", "frame.p2p_dir", FT_UINT8, BASE_DEC, VALS(p2p_dirs), 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_frame_file_off,
|
|
{ "File Offset", "frame.file_off", FT_INT32, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_frame_marked,
|
|
{ "Frame is marked", "frame.marked", FT_BOOLEAN, 8, NULL, 0x0,
|
|
"Frame is marked in the GUI", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_frame,
|
|
};
|
|
module_t *frame_module;
|
|
|
|
wtap_encap_dissector_table = register_dissector_table("wtap_encap",
|
|
"Wiretap encapsulation type", FT_UINT32, BASE_DEC);
|
|
|
|
proto_frame = proto_register_protocol("Frame", "Frame", "frame");
|
|
proto_register_field_array(proto_frame, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
register_dissector("frame",dissect_frame,proto_frame);
|
|
|
|
/* You can't disable dissection of "Frame", as that would be
|
|
tantamount to not doing any dissection whatsoever. */
|
|
proto_set_cant_disable(proto_frame);
|
|
|
|
proto_short = proto_register_protocol("Short Frame", "Short frame", "short");
|
|
proto_malformed = proto_register_protocol("Malformed Packet",
|
|
"Malformed packet", "malformed");
|
|
proto_unreassembled = proto_register_protocol(
|
|
"Unreassembled Fragmented Packet",
|
|
"Unreassembled fragmented packet", "unreassembled");
|
|
|
|
/* "Short Frame", "Malformed Packet", and "Unreassembled Fragmented
|
|
Packet" aren't really protocols, they're error indications;
|
|
disabling them makes no sense. */
|
|
proto_set_cant_disable(proto_short);
|
|
proto_set_cant_disable(proto_malformed);
|
|
proto_set_cant_disable(proto_unreassembled);
|
|
|
|
/* Our preferences */
|
|
frame_module = prefs_register_protocol(proto_frame, NULL);
|
|
prefs_register_bool_preference(frame_module, "show_file_off",
|
|
"Show File Offset", "Show File Offset", &show_file_off);
|
|
prefs_register_bool_preference(frame_module, "force_docsis_encap",
|
|
"Treat all frames as DOCSIS frames", "Treat all frames as DOCSIS Frames", &force_docsis_encap);
|
|
|
|
frame_tap=register_tap("frame");
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_frame(void)
|
|
{
|
|
data_handle = find_dissector("data");
|
|
docsis_handle = find_dissector("docsis");
|
|
}
|