![Guy Harris](/assets/img/avatar_default.png)
"{old_}heur_dissector_add()", "{old_}conv_dissector_add()", and "register_dissector()", so that an entry in those tables has associated with it the protocol index of the protocol the dissector handles (or -1, if there is no protocol index for it). This is for future use in a number of places. (Arguably, "proto_register_protocol()" should take a dissector pointer as an argument, but 1) it'd have to handle both regular and heuristic dissectors; 2) making it take either a "dissector_t" or a union of that and a "heur_dissector_t" introduces some painful header-file interdependencies so I'm punting on that for now. As with other Ethereal internal APIs, these APIs are subject to change in the future, at least until Ethereal 1.0 comes out....) svn path=/trunk/; revision=2849
168 lines
5.1 KiB
C
168 lines
5.1 KiB
C
/* packet-raw.c
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* Routines for raw packet disassembly
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*
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* $Id: packet-raw.c,v 1.24 2001/01/09 06:31:40 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.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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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.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 "packet.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 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 ppp_handle;
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void
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capture_raw(const u_char *pd, 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(0,2) && pd[0] == 0xff && pd[1] == 0x03) {
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capture_ppp(pd, 0, 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(0,8) && pd[6] == 0xff && pd[7] == 0x03) {
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capture_ppp(pd, 6, 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(0,3) && pd[1] == 0xff && pd[2] == 0x03) {
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capture_ppp(pd, 1, 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(0,10) && memcmp(pd, zeroes, 10) == 0) {
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capture_ip(pd, 10, ld);
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}
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else {
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capture_ip(pd, 0, ld);
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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->fd, COL_RES_DL_SRC))
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col_set_str(pinfo->fd, COL_RES_DL_SRC, "N/A" );
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if(check_col(pinfo->fd, COL_RES_DL_DST))
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col_set_str(pinfo->fd, COL_RES_DL_DST, "N/A" );
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if(check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "N/A" );
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if(check_col(pinfo->fd, COL_INFO))
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col_set_str(pinfo->fd, 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_text(tree, tvb, 0, 0, "Raw packet data" );
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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_handle, tvb, pinfo, tree);
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return;
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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_handle, next_tvb, pinfo, tree);
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return;
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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_handle, next_tvb, pinfo, tree);
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return;
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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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return;
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}
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else {
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next_tvb = tvb_new_subset(tvb, 0, -1, -1);
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call_dissector(ip_handle, next_tvb, pinfo, tree);
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return;
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}
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g_assert_not_reached();
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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_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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/*
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* Get handles for the IP and PPP dissectors.
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*/
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ip_handle = find_dissector("ip");
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ppp_handle = find_dissector("ppp");
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dissector_add("wtap_encap", WTAP_ENCAP_RAW_IP, dissect_raw, -1);
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}
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