forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
WTAP_ENCAP_ISDN encapsulation type, which includes a pseudo-header giving the direction (user-to-network or network-to-user) and the channel number. Add a new circuit type, using the ISDN channel number as the circuit ID. Add an ISDN dissector to put the direction and channel number into the protocol tree and to call the appropriate dissector for the payload based on the channel (LAPD for the D channel; V.120, PPP, or data for B channels, based on some heuristics). svn path=/trunk/; revision=6521
318 lines
9.3 KiB
C
318 lines
9.3 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 1.32 2002/10/31 07:12:23 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_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:
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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_str(pinfo->cinfo, COL_INFO,
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"[Unreassembled Packet]");
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proto_tree_add_protocol_format(tree, proto_unreassembled,
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tvb, 0, 0, "[Unreassembled Packet: %s]",
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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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