feab79e328
svn path=/trunk/; revision=18196
205 lines
6 KiB
C
205 lines
6 KiB
C
/* packet-raw.c
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* Routines for raw packet disassembly
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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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*
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* This file created and by Mike Hall <mlh@io.com>
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* Copyright 1998
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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 <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include "packet-raw.h"
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#include "packet-ip.h"
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#include "packet-ppp.h"
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static int proto_raw = -1;
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static gint ett_raw = -1;
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static const char zeroes[10];
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static dissector_handle_t ip_handle;
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static dissector_handle_t ipv6_handle;
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static dissector_handle_t data_handle;
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static dissector_handle_t ppp_hdlc_handle;
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void
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capture_raw(const guchar *pd, int len, packet_counts *ld)
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{
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/* So far, the only time we get raw connection types are with Linux and
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* Irix PPP connections. We can't tell what type of data is coming down
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* the line, so our safest bet is IP. - GCC
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*/
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/* Currently, the Linux 2.1.xxx PPP driver passes back some of the header
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* sometimes. This check should be removed when 2.2 is out.
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*/
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if (BYTES_ARE_IN_FRAME(0,len,2) && pd[0] == 0xff && pd[1] == 0x03) {
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capture_ppp_hdlc(pd, 0, len, ld);
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}
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/* The Linux ISDN driver sends a fake MAC address before the PPP header
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* on its ippp interfaces... */
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else if (BYTES_ARE_IN_FRAME(0,len,8) && pd[6] == 0xff && pd[7] == 0x03) {
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capture_ppp_hdlc(pd, 6, len, ld);
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}
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/* ...except when it just puts out one byte before the PPP header... */
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else if (BYTES_ARE_IN_FRAME(0,len,3) && pd[1] == 0xff && pd[2] == 0x03) {
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capture_ppp_hdlc(pd, 1, len, ld);
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}
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/* ...and if the connection is currently down, it sends 10 bytes of zeroes
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* instead of a fake MAC address and PPP header. */
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else if (BYTES_ARE_IN_FRAME(0,len,10) && memcmp(pd, zeroes, 10) == 0) {
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capture_ip(pd, 10, len, ld);
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}
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else {
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/*
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* OK, is this IPv4 or IPv6?
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*/
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if (BYTES_ARE_IN_FRAME(0,len,1)) {
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switch (pd[0] & 0xF0) {
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case 0x40:
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/* IPv4 */
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capture_ip(pd, 0, len, ld);
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break;
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#if 0
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case 0x60:
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/* IPv6 */
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capture_ipv6(pd, 0, len, ld);
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break;
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#endif
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}
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}
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}
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}
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static void
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dissect_raw(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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tvbuff_t *next_tvb;
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/* load the top pane info. This should be overwritten by
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the next protocol in the stack */
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if(check_col(pinfo->cinfo, COL_RES_DL_SRC))
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col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A" );
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if(check_col(pinfo->cinfo, COL_RES_DL_DST))
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col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A" );
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if(check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "N/A" );
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if(check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, "Raw packet data" );
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/* populate a tree in the second pane with the status of the link
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layer (ie none) */
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if (tree) {
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ti = proto_tree_add_item(tree, proto_raw, tvb, 0, 0, FALSE);
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fh_tree = proto_item_add_subtree(ti, ett_raw);
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proto_tree_add_text(fh_tree, tvb, 0, 0, "No link information available");
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}
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/* So far, the only time we get raw connection types are with Linux and
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* Irix PPP connections. We can't tell what type of data is coming down
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* the line, so our safest bet is IP. - GCC
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*/
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/* Currently, the Linux 2.1.xxx PPP driver passes back some of the header
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* sometimes. This check should be removed when 2.2 is out.
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*/
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if (tvb_get_ntohs(tvb, 0) == 0xff03) {
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call_dissector(ppp_hdlc_handle, tvb, pinfo, tree);
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}
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/* The Linux ISDN driver sends a fake MAC address before the PPP header
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* on its ippp interfaces... */
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else if (tvb_get_ntohs(tvb, 6) == 0xff03) {
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next_tvb = tvb_new_subset(tvb, 6, -1, -1);
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call_dissector(ppp_hdlc_handle, next_tvb, pinfo, tree);
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}
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/* ...except when it just puts out one byte before the PPP header... */
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else if (tvb_get_ntohs(tvb, 1) == 0xff03) {
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next_tvb = tvb_new_subset(tvb, 1, -1, -1);
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call_dissector(ppp_hdlc_handle, next_tvb, pinfo, tree);
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}
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/* ...and if the connection is currently down, it sends 10 bytes of zeroes
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* instead of a fake MAC address and PPP header. */
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else if (memcmp(tvb_get_ptr(tvb, 0, 10), zeroes, 10) == 0) {
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next_tvb = tvb_new_subset(tvb, 10, -1, -1);
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call_dissector(ip_handle, next_tvb, pinfo, tree);
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}
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else {
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/*
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* OK, is this IPv4 or IPv6?
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*/
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switch (tvb_get_guint8(tvb, 0) & 0xF0) {
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case 0x40:
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/* IPv4 */
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call_dissector(ip_handle, tvb, pinfo, tree);
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break;
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case 0x60:
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/* IPv6 */
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call_dissector(ipv6_handle, tvb, pinfo, tree);
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break;
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default:
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/* None of the above. */
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call_dissector(data_handle, tvb, pinfo, tree);
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break;
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}
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}
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}
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void
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proto_register_raw(void)
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{
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static gint *ett[] = {
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&ett_raw,
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};
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proto_raw = proto_register_protocol("Raw packet data", "Raw", "raw");
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_raw(void)
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{
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dissector_handle_t raw_handle;
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/*
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* Get handles for the IP, IPv6, undissected-data, and
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* PPP-in-HDLC-like-framing dissectors.
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*/
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ip_handle = find_dissector("ip");
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ipv6_handle = find_dissector("ipv6");
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data_handle = find_dissector("data");
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ppp_hdlc_handle = find_dissector("ppp_hdlc");
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raw_handle = create_dissector_handle(dissect_raw, proto_raw);
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dissector_add("wtap_encap", WTAP_ENCAP_RAW_IP, raw_handle);
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}
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