![Guy Harris](/assets/img/avatar_default.png)
keys to have _uint in their names, to match the routines that handle dissector tables with string keys. (Using _port can confuse people into thinking they're intended solely for use with TCP/UDP/etc. ports when, in fact, they work better for things such as Ethernet types, where the binding of particular values to particular protocols are a lot stronger.) svn path=/trunk/; revision=35224
369 lines
11 KiB
C
369 lines
11 KiB
C
/* packet-roofnet.c
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* Routines for roofnet dissection
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* Copyright 2006, Sebastien Tandel (sebastien@tandel.be)
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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/addr_resolv.h>
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#include <epan/value_string.h>
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#include <epan/expert.h>
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#include <epan/ptvcursor.h>
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#include <epan/tvbuff.h>
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/* roofnet packet type constants */
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#define ROOFNET_PT_QUERY 0x01
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#define ROOFNET_PT_REPLY 0x02
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#define ROOFNET_PT_DATA 0x04
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#define ROOFNET_PT_GATEWAY 0x08
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static const value_string roofnet_pt_vals[] = {
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{ ROOFNET_PT_QUERY, "Query" },
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{ ROOFNET_PT_REPLY, "Reply" },
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{ ROOFNET_PT_DATA, "Data" },
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{ ROOFNET_PT_GATEWAY, "Gateway" },
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{ 0, NULL }
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};
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/* roofnet flag bit masks */
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#define ROOFNET_FLAG_ERROR 0x01
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#define ROOFNET_FLAG_UPDATE 0x02
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static const value_string roofnet_flags_vals[] = {
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{ ROOFNET_FLAG_ERROR, "Error" },
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{ ROOFNET_FLAG_UPDATE, "Update" },
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{ 0, NULL }
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};
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/* header length */
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#define ROOFNET_HEADER_LENGTH 160
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/* roofnet max length */
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/* may change with time */
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#define ROOFNET_MAX_LENGTH 400
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/* Roofnet Link Description Length
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* which is 6 fields of 4 bytes */
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#define ROOFNET_LINK_DESCRIPTION_LENGTH 6*4
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/* offset constants */
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#define ROOFNET_OFFSET_TYPE 1
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#define ROOFNET_OFFSET_NLINKS 2
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#define ROOFNET_OFFSET_DATA_LENGTH 10
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/* offset relative to a link section of roofnet */
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#define ROOFNET_LINK_OFFSET_SRC 0
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#define ROOFNET_LINK_OFFSET_DST 20
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/* roofnet link fields length */
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#define ROOFNET_LINK_LEN 24
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/* forward reference */
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void proto_reg_handoff_roofnet(void);
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static dissector_handle_t ip_handle;
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static int proto_roofnet = -1;
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/* hf fields for the header of roofnet */
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static int hf_roofnet_version = -1;
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static int hf_roofnet_type = -1;
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static int hf_roofnet_nlinks = -1;
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static int hf_roofnet_next = -1;
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static int hf_roofnet_ttl = -1;
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static int hf_roofnet_cksum = -1;
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static int hf_roofnet_flags = -1;
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static int hf_roofnet_data_length = -1;
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static int hf_roofnet_query_dst = -1;
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static int hf_roofnet_seq = -1;
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static int hf_roofnet_links = -1;
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static int hf_roofnet_link_src = -1;
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static int hf_roofnet_link_forward = -1;
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static int hf_roofnet_link_rev = -1;
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static int hf_roofnet_link_seq = -1;
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static int hf_roofnet_link_age = -1;
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static int hf_roofnet_link_dst = -1;
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static gint ett_roofnet = -1;
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static gint ett_roofnet_link = -1;
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/*
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* dissect the header of roofnet
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*/
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static void dissect_roofnet_header(proto_tree *tree, tvbuff_t *tvb, guint *offset)
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{
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ptvcursor_t *cursor = ptvcursor_new(tree, tvb, *offset);
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ptvcursor_add(cursor, hf_roofnet_version, 1, FALSE);
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ptvcursor_add(cursor, hf_roofnet_type, 1, FALSE);
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ptvcursor_add(cursor, hf_roofnet_nlinks, 1, FALSE);
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ptvcursor_add(cursor, hf_roofnet_next, 1, FALSE);
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ptvcursor_add(cursor, hf_roofnet_ttl, 2, FALSE);
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ptvcursor_add(cursor, hf_roofnet_cksum, 2, FALSE);
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ptvcursor_add(cursor, hf_roofnet_flags, 2, FALSE);
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ptvcursor_add(cursor, hf_roofnet_data_length, 2, FALSE);
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ptvcursor_add(cursor, hf_roofnet_query_dst, 4, FALSE);
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ptvcursor_add(cursor, hf_roofnet_seq, 4, FALSE);
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*offset = ptvcursor_current_offset(cursor);
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ptvcursor_free(cursor);
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}
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/*
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* dissect the description of link in roofnet
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*/
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static void dissect_roofnet_link(proto_tree *tree, tvbuff_t *tvb, guint *offset, guint link)
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{
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proto_item *it= NULL;
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proto_tree *subtree= NULL;
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ptvcursor_t *cursor= NULL;
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guint32 addr_src= 0;
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guint32 addr_dst= 0;
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addr_src= tvb_get_ipv4(tvb, *offset + ROOFNET_LINK_OFFSET_SRC);
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addr_dst= tvb_get_ipv4(tvb, *offset + ROOFNET_LINK_OFFSET_DST);
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it = proto_tree_add_text(tree, tvb, *offset, ROOFNET_LINK_LEN,
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"link: %u, src: %s, dst: %s",
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link,
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(char*)get_hostname(addr_src),
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(char*)get_hostname(addr_dst));
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subtree= proto_item_add_subtree(it, ett_roofnet_link);
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proto_tree_add_ipv4(subtree, hf_roofnet_link_src, tvb, *offset, 4, addr_src);
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*offset += 4;
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cursor = ptvcursor_new(subtree, tvb, *offset);
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ptvcursor_add(cursor, hf_roofnet_link_forward, 4, FALSE);
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ptvcursor_add(cursor, hf_roofnet_link_rev, 4, FALSE);
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ptvcursor_add(cursor, hf_roofnet_link_seq, 4, FALSE);
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ptvcursor_add(cursor, hf_roofnet_link_age, 4, FALSE);
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ptvcursor_free(cursor);
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*offset = ptvcursor_current_offset(cursor);
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proto_tree_add_ipv4(subtree, hf_roofnet_link_dst, tvb, *offset, 4, addr_dst);
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/* don't increment offset here because the dst of this link is the src of the next one */
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}
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/*
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* dissect the data in roofnet
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*/
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static void dissect_roofnet_data(proto_tree *tree, tvbuff_t *tvb, packet_info * pinfo, gint offset)
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{
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guint16 roofnet_datalen= 0;
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guint16 remaining_datalen= 0;
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roofnet_datalen = tvb_get_ntohs(tvb, ROOFNET_OFFSET_DATA_LENGTH);
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remaining_datalen= tvb_reported_length_remaining(tvb, offset);
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/* dissect on remaining_datalen */
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if (roofnet_datalen < remaining_datalen)
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proto_tree_add_text(tree, tvb, offset, roofnet_datalen,
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"[More payload data (%u) than told by Roofnet (%u)]",
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remaining_datalen, roofnet_datalen);
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if (roofnet_datalen == 0)
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return;
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/* dissect ip payload */
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call_dissector(ip_handle, tvb_new_subset_remaining(tvb, offset), pinfo, tree);
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}
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/*
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* entry point of the roofnet dissector
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*/
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static void dissect_roofnet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item * it= NULL;
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proto_tree * roofnet_tree= NULL;
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guint offset= 0;
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guint8 roofnet_msg_type= 0;
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guint8 roofnet_nlinks= 0;
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guint8 nlink= 1;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Roofnet");
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roofnet_msg_type = tvb_get_guint8(tvb, ROOFNET_OFFSET_TYPE);
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/* Clear out stuff in the info column */
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "Message Type: %s",
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val_to_str(roofnet_msg_type, roofnet_pt_vals, "Unknown (%d)"));
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}
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if (tree) {
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it = proto_tree_add_item(tree, proto_roofnet, tvb, offset, -1, FALSE);
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roofnet_tree = proto_item_add_subtree(it, ett_roofnet);
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}
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dissect_roofnet_header(roofnet_tree, tvb, &offset);
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roofnet_nlinks= tvb_get_guint8(tvb, ROOFNET_OFFSET_NLINKS);
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/* Check that we do not have a malformed roofnet packet */
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if ((roofnet_nlinks*6*4)+ROOFNET_HEADER_LENGTH > ROOFNET_MAX_LENGTH) {
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if (tree) {
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expert_add_info_format(pinfo, it, PI_MALFORMED, PI_ERROR, "Too many links (%u)\n", roofnet_nlinks);
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}
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return;
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}
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for (; roofnet_nlinks > 0; roofnet_nlinks--) {
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/* Do we have enough buffer to decode the next link ? */
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if (tvb_reported_length_remaining(tvb, offset) < ROOFNET_LINK_DESCRIPTION_LENGTH)
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return;
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dissect_roofnet_link(roofnet_tree, tvb, &offset, nlink++);
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}
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dissect_roofnet_data(tree, tvb, pinfo, offset+4);
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}
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void proto_register_roofnet(void)
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{
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static hf_register_info hf[] = {
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/* Roofnet Header */
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{ &hf_roofnet_version,
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{ "Version", "roofnet.version",
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FT_UINT8, BASE_DEC, NULL, 0x0, "Roofnet Version", HFILL }
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},
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{ &hf_roofnet_type,
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{ "Type", "roofnet.type",
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FT_UINT8, BASE_DEC, VALS(roofnet_pt_vals), 0x0, "Roofnet Message Type", HFILL }
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},
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{ &hf_roofnet_nlinks,
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{ "Number of Links", "roofnet.nlinks",
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FT_UINT8, BASE_DEC, NULL, 0x0, "Roofnet Number of Links", HFILL }
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},
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{ &hf_roofnet_next,
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{ "Next Link", "roofnet.next",
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FT_UINT8, BASE_DEC, NULL, 0x0, "Roofnet Next Link to Use", HFILL }
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},
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{ &hf_roofnet_ttl,
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{ "Time To Live", "roofnet.ttl",
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FT_UINT16, BASE_DEC, NULL, 0x0, "Roofnet Time to Live", HFILL }
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},
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{ &hf_roofnet_cksum,
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{ "Checksum", "roofnet.cksum",
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FT_UINT16, BASE_DEC, NULL, 0x0, "Roofnet Header Checksum", HFILL }
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},
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{ &hf_roofnet_flags,
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{ "Flags", "roofnet.flags",
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FT_UINT16, BASE_DEC, VALS(roofnet_flags_vals), 0x0, "Roofnet Flags", HFILL }
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},
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{ &hf_roofnet_data_length,
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{ "Data Length", "roofnet.datalength",
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FT_UINT16, BASE_DEC, NULL, 0x0, "Data Payload Length", HFILL }
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},
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{ &hf_roofnet_query_dst,
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{ "Query Dst", "roofnet.querydst",
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FT_IPv4, BASE_NONE, NULL, 0x0, "Roofnet Query Destination", HFILL }
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},
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{ &hf_roofnet_seq,
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{ "Seq", "roofnet.seq",
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FT_UINT32, BASE_DEC, NULL, 0x0, "Roofnet Sequential Number", HFILL }
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},
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{ &hf_roofnet_links,
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{ "Links", "roofnet.links",
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FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_roofnet_link_src,
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{ "Source IP", "roofnet.link.src",
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FT_IPv4, BASE_NONE, NULL, 0x0, "Roofnet Message Source", HFILL }
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},
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{ &hf_roofnet_link_forward,
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{ "Forward", "roofnet.link.forward",
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FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_roofnet_link_rev,
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{ "Rev", "roofnet.link.rev",
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FT_UINT32, BASE_DEC, NULL, 0x0, "Revision Number", HFILL }
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},
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{ &hf_roofnet_link_seq,
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{ "Seq", "roofnet.link.seq",
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FT_UINT32, BASE_DEC, NULL, 0x0, "Link Sequential Number", HFILL }
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},
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{ &hf_roofnet_link_age,
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{ "Age", "roofnet.link.age",
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FT_UINT32, BASE_DEC, NULL, 0x0, "Information Age", HFILL }
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},
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{ &hf_roofnet_link_dst,
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{ "Dst IP", "roofnet.link.dst",
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FT_IPv4, BASE_NONE, NULL, 0x0, "Roofnet Message Destination", HFILL }
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}
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};
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/* setup protocol subtree array */
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static gint *ett[] = {
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&ett_roofnet,
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&ett_roofnet_link
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};
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proto_roofnet = proto_register_protocol(
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"Roofnet Protocol", /* Name */
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"Roofnet", /* Short Name */
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"roofnet" /* Abbrev */
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);
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proto_register_field_array(proto_roofnet, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void proto_reg_handoff_roofnet(void)
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{
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dissector_handle_t roofnet_handle;
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/* Until now there is no other option than having an IPv4 payload (maybe
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* extended one day to IPv6 or other?) */
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ip_handle = find_dissector("ip");
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roofnet_handle = create_dissector_handle(dissect_roofnet, proto_roofnet);
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/* I did not put the type numbers in the ethertypes.h as they only are
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* experimental and not official */
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dissector_add_uint("ethertype", 0x0641, roofnet_handle);
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dissector_add_uint("ethertype", 0x0643, roofnet_handle);
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dissector_add_uint("ethertype", 0x0644, roofnet_handle);
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dissector_add_uint("ethertype", 0x0645, roofnet_handle);
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}
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