4156806b8b
wasn't done, and, for TCP, use that mechanism if reassembly isn't done is an incorrect TCP checksum. svn path=/trunk/; revision=7212
320 lines
9.4 KiB
C
320 lines
9.4 KiB
C
/* packet-frame.c
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*
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* Top-most dissector. Decides dissector based on Wiretap Encapsulation Type.
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*
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* $Id: packet-frame.c,v 1.35 2003/02/27 03:56:46 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 2000 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/timestamp.h>
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#include <epan/tvbuff.h>
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#include "packet-frame.h"
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#include "prefs.h"
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#include "tap.h"
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static int proto_frame = -1;
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static int hf_frame_arrival_time = -1;
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static int hf_frame_time_delta = -1;
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static int hf_frame_time_relative = -1;
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static int hf_frame_number = -1;
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static int hf_frame_packet_len = -1;
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static int hf_frame_capture_len = -1;
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static int hf_frame_p2p_dir = -1;
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static int hf_frame_file_off = -1;
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static int hf_frame_marked = -1;
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static int proto_short = -1;
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int proto_malformed = -1;
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static int proto_unreassembled = -1;
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static gint ett_frame = -1;
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static int frame_tap = -1;
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static dissector_handle_t data_handle;
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static dissector_handle_t docsis_handle;
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/* Preferences */
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static gboolean show_file_off = FALSE;
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static gboolean force_docsis_encap;
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static const value_string p2p_dirs[] = {
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{ P2P_DIR_SENT, "Sent" },
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{ P2P_DIR_RECV, "Received" },
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{ 0, NULL }
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};
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static dissector_table_t wtap_encap_dissector_table;
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static void
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dissect_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *fh_tree;
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proto_item *ti;
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nstime_t ts;
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int cap_len, pkt_len;
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pinfo->current_proto = "Frame";
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if (pinfo->pseudo_header != NULL) {
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switch (pinfo->fd->lnk_t) {
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case WTAP_ENCAP_WFLEET_HDLC:
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case WTAP_ENCAP_CHDLC:
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case WTAP_ENCAP_PPP_WITH_PHDR:
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pinfo->p2p_dir = pinfo->pseudo_header->p2p.sent ?
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P2P_DIR_SENT : P2P_DIR_RECV;
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break;
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case WTAP_ENCAP_LAPB:
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case WTAP_ENCAP_FRELAY_WITH_PHDR:
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pinfo->p2p_dir =
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(pinfo->pseudo_header->x25.flags & FROM_DCE) ?
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P2P_DIR_RECV : P2P_DIR_SENT;
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break;
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case WTAP_ENCAP_ISDN:
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pinfo->p2p_dir = pinfo->pseudo_header->isdn.uton ?
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P2P_DIR_SENT : P2P_DIR_RECV;
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break;
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}
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}
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if ((force_docsis_encap) && (docsis_handle)) {
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/*
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* XXX - setting it here makes it impossible to
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* turn the "Treat all frames as DOCSIS frames"
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* option off.
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*
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* The TCP Graph code currently uses "fd->lnk_t";
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* it should eventually just get the information
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* it needs from a full-blown dissection, so that
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* can handle any link-layer type.
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*/
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pinfo->fd->lnk_t = WTAP_ENCAP_DOCSIS;
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}
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/* Put in frame header information. */
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if (tree) {
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cap_len = tvb_length(tvb);
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pkt_len = tvb_reported_length(tvb);
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ti = proto_tree_add_protocol_format(tree, proto_frame, tvb, 0, -1,
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"Frame %u (%u bytes on wire, %u bytes captured)", pinfo->fd->num, pkt_len, cap_len);
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fh_tree = proto_item_add_subtree(ti, ett_frame);
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proto_tree_add_boolean_hidden(fh_tree, hf_frame_marked, tvb, 0, 0,pinfo->fd->flags.marked);
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ts.secs = pinfo->fd->abs_secs;
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ts.nsecs = pinfo->fd->abs_usecs*1000;
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proto_tree_add_time(fh_tree, hf_frame_arrival_time, tvb,
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0, 0, &ts);
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ts.secs = pinfo->fd->del_secs;
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ts.nsecs = pinfo->fd->del_usecs*1000;
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proto_tree_add_time(fh_tree, hf_frame_time_delta, tvb,
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0, 0, &ts);
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ts.secs = pinfo->fd->rel_secs;
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ts.nsecs = pinfo->fd->rel_usecs*1000;
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proto_tree_add_time(fh_tree, hf_frame_time_relative, tvb,
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0, 0, &ts);
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proto_tree_add_uint(fh_tree, hf_frame_number, tvb,
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0, 0, pinfo->fd->num);
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proto_tree_add_uint_format(fh_tree, hf_frame_packet_len, tvb,
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0, 0, pkt_len, "Packet Length: %d byte%s", pkt_len,
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plurality(pkt_len, "", "s"));
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proto_tree_add_uint_format(fh_tree, hf_frame_capture_len, tvb,
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0, 0, cap_len, "Capture Length: %d byte%s", cap_len,
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plurality(cap_len, "", "s"));
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/* Check for existences of P2P pseudo header */
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if (pinfo->p2p_dir != P2P_DIR_UNKNOWN) {
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proto_tree_add_uint(fh_tree, hf_frame_p2p_dir, tvb,
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0, 0, pinfo->p2p_dir);
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}
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if (show_file_off) {
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proto_tree_add_int_format(fh_tree, hf_frame_file_off, tvb,
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0, 0, pinfo->fd->file_off,
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"File Offset: %ld (0x%lx)",
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pinfo->fd->file_off, pinfo->fd->file_off);
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}
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}
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TRY {
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if (!dissector_try_port(wtap_encap_dissector_table, pinfo->fd->lnk_t,
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tvb, pinfo, tree)) {
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "UNKNOWN");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_fstr(pinfo->cinfo, COL_INFO, "WTAP_ENCAP = %u",
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pinfo->fd->lnk_t);
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call_dissector(data_handle,tvb, pinfo, tree);
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}
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}
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CATCH(BoundsError) {
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if (check_col(pinfo->cinfo, COL_INFO))
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col_append_str(pinfo->cinfo, COL_INFO, "[Short Frame]");
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proto_tree_add_protocol_format(tree, proto_short, tvb, 0, 0,
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"[Short Frame: %s]", pinfo->current_proto);
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}
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CATCH(ReportedBoundsError) {
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show_reported_bounds_error(tvb, pinfo, tree);
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}
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ENDTRY;
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tap_queue_packet(frame_tap, pinfo, NULL);
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}
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void
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show_reported_bounds_error(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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if (pinfo->fragmented) {
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/*
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* We were dissecting an unreassembled fragmented
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* packet when the exception was thrown, so the
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* problem isn't that the dissector expected
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* something but it wasn't in the packet, the
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* problem is that the dissector expected something
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* but it wasn't in the fragment we dissected.
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*/
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if (check_col(pinfo->cinfo, COL_INFO))
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col_append_fstr(pinfo->cinfo, COL_INFO,
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"[Unreassembled Packet%s]",
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pinfo->noreassembly_reason);
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proto_tree_add_protocol_format(tree, proto_unreassembled,
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tvb, 0, 0, "[Unreassembled Packet%s: %s]",
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pinfo->noreassembly_reason, pinfo->current_proto);
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} else {
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if (check_col(pinfo->cinfo, COL_INFO))
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col_append_str(pinfo->cinfo, COL_INFO,
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"[Malformed Packet]");
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proto_tree_add_protocol_format(tree, proto_malformed,
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tvb, 0, 0, "[Malformed Packet: %s]", pinfo->current_proto);
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}
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}
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void
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proto_register_frame(void)
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{
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static hf_register_info hf[] = {
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{ &hf_frame_arrival_time,
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{ "Arrival Time", "frame.time", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
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"", HFILL }},
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{ &hf_frame_time_delta,
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{ "Time delta from previous packet", "frame.time_delta", FT_RELATIVE_TIME, BASE_NONE, NULL,
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0x0,
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"", HFILL }},
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{ &hf_frame_time_relative,
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{ "Time relative to first packet", "frame.time_relative", FT_RELATIVE_TIME, BASE_NONE, NULL,
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0x0,
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"", HFILL }},
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{ &hf_frame_number,
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{ "Frame Number", "frame.number", FT_UINT32, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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{ &hf_frame_packet_len,
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{ "Total Frame Length", "frame.pkt_len", FT_UINT32, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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{ &hf_frame_capture_len,
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{ "Capture Frame Length", "frame.cap_len", FT_UINT32, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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{ &hf_frame_p2p_dir,
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{ "Point-to-Point Direction", "frame.p2p_dir", FT_UINT8, BASE_DEC, VALS(p2p_dirs), 0x0,
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"", HFILL }},
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{ &hf_frame_file_off,
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{ "File Offset", "frame.file_off", FT_INT32, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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{ &hf_frame_marked,
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{ "Frame is marked", "frame.marked", FT_BOOLEAN, 8, NULL, 0x0,
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"Frame is marked in the GUI", HFILL }},
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};
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static gint *ett[] = {
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&ett_frame,
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};
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module_t *frame_module;
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wtap_encap_dissector_table = register_dissector_table("wtap_encap",
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"Wiretap encapsulation type", FT_UINT32, BASE_DEC);
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proto_frame = proto_register_protocol("Frame", "Frame", "frame");
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proto_register_field_array(proto_frame, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("frame",dissect_frame,proto_frame);
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/* You can't disable dissection of "Frame", as that would be
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tantamount to not doing any dissection whatsoever. */
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proto_set_cant_disable(proto_frame);
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proto_short = proto_register_protocol("Short Frame", "Short frame", "short");
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proto_malformed = proto_register_protocol("Malformed Packet",
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"Malformed packet", "malformed");
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proto_unreassembled = proto_register_protocol(
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"Unreassembled Fragmented Packet",
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"Unreassembled fragmented packet", "unreassembled");
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/* "Short Frame", "Malformed Packet", and "Unreassembled Fragmented
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Packet" aren't really protocols, they're error indications;
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disabling them makes no sense. */
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proto_set_cant_disable(proto_short);
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proto_set_cant_disable(proto_malformed);
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proto_set_cant_disable(proto_unreassembled);
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/* Our preferences */
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frame_module = prefs_register_protocol(proto_frame, NULL);
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prefs_register_bool_preference(frame_module, "show_file_off",
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"Show File Offset", "Show File Offset", &show_file_off);
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prefs_register_bool_preference(frame_module, "force_docsis_encap",
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"Treat all frames as DOCSIS frames", "Treat all frames as DOCSIS Frames", &force_docsis_encap);
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frame_tap=register_tap("frame");
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}
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void
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proto_reg_handoff_frame(void)
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{
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data_handle = find_dissector("data");
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docsis_handle = find_dissector("docsis");
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}
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