osmith
/
wireshark
forked from osmocom/wireshark
1
0
Fork 0
Code Pull Requests Releases Wiki Activity
wireshark/epan/dissectors/packet-arcnet.c

390 lines
12 KiB
C
Raw Blame History

/* packet-arcnet.c
* Routines for arcnet dissection
* Copyright 2001-2002, Peter Fales <ethereal@fales-lorenz.net>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include "packet-arcnet.h"
#include <epan/arcnet_pids.h>
#include "packet-ip.h"
/* Initialize the protocol and registered fields */
static int proto_arcnet = -1;
static int hf_arcnet_src = -1;
static int hf_arcnet_dst = -1;
static int hf_arcnet_offset = -1;
static int hf_arcnet_protID = -1;
static int hf_arcnet_exception_flag = -1;
static int hf_arcnet_split_flag = -1;
static int hf_arcnet_sequence = -1;
/* Initialize the subtree pointers */
static gint ett_arcnet = -1;
static dissector_table_t arcnet_dissector_table;
static dissector_handle_t data_handle;
void
capture_arcnet (const guchar *pd, int len, packet_counts *ld,
gboolean has_offset, gboolean has_exception)
{
int offset = has_offset ? 4 : 2;
if (!BYTES_ARE_IN_FRAME(offset, len, 1)) {
ld->other++;
return;
}
switch (pd[offset]) {
case ARCNET_PROTO_IP_1051:
/* No fragmentation stuff in the header */
capture_ip(pd, offset + 1, len, ld);
break;
case ARCNET_PROTO_IP_1201:
/*
* There's fragmentation stuff in the header.
*
* XXX - on at least some versions of NetBSD, it appears that we
* might we get ARCNET frames, not reassembled packets; we should
* perhaps bump "ld->other" for all but the first frame of a packet.
*
* XXX - but on FreeBSD it appears that we get reassembled packets
* on input (but apparently we get frames on output - or maybe
* we get the packet *and* all its frames!); how to tell the
* difference? It looks from the FreeBSD reassembly code as if
* the reassembled packet arrives with the header for the first
* frame. It also looks as if, on output, we first get the
* full packet, with a header containing none of the fragmentation
* stuff, and then get the frames.
*
* On Linux, we get only reassembled packets, and the exception
* frame stuff is hidden - there's a split flag and sequence
* number, but it appears that it will never have the exception
* frame stuff.
*
* XXX - what about OpenBSD? And, for that matter, what about
* Windows? (I suspect Windows supplies reassembled frames,
* as WinPcap, like PF_PACKET sockets, taps into the networking
* stack just as other protocols do.)
*/
offset++;
if (!BYTES_ARE_IN_FRAME(offset, len, 1)) {
ld->other++;
return;
}
if (has_exception && pd[offset] == 0xff) {
/* This is an exception packet. The flag value there is the
"this is an exception flag" packet; the next two bytes
after it are padding, and another copy of the packet
type appears after the padding. */
offset += 4;
}
capture_ip(pd, offset + 3, len, ld);
break;
case ARCNET_PROTO_ARP_1051:
case ARCNET_PROTO_ARP_1201:
/*
* XXX - do we have to worry about fragmentation for ARP?
*/
ld->arp++;
break;
case ARCNET_PROTO_IPX:
ld->ipx++;
break;
default:
ld->other++;
break;
}
}
static void
dissect_arcnet_common (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree,
gboolean has_offset, gboolean has_exception)
{
int offset = 0;
guint8 dst, src, protID, split_flag;
tvbuff_t *next_tvb;
proto_item *ti = NULL;
proto_tree *arcnet_tree = NULL;
if (check_col (pinfo->cinfo, COL_PROTOCOL))
col_set_str (pinfo->cinfo, COL_PROTOCOL, "ARCNET");
if (check_col (pinfo->cinfo, COL_INFO))
col_set_str (pinfo->cinfo, COL_INFO, "ARCNET");
src = tvb_get_guint8 (tvb, 0);
dst = tvb_get_guint8 (tvb, 1);
SET_ADDRESS(&pinfo->dl_src, AT_ARCNET, 1, tvb_get_ptr(tvb, 0, 1));
SET_ADDRESS(&pinfo->src, AT_ARCNET, 1, tvb_get_ptr(tvb, 0, 1));
SET_ADDRESS(&pinfo->dl_dst, AT_ARCNET, 1, tvb_get_ptr(tvb, 1, 1));
SET_ADDRESS(&pinfo->dst, AT_ARCNET, 1, tvb_get_ptr(tvb, 1, 1));
if (tree)
{
ti =
proto_tree_add_item (tree, proto_arcnet, tvb, 0, -1, FALSE);
arcnet_tree = proto_item_add_subtree (ti, ett_arcnet);
proto_tree_add_uint (tree, hf_arcnet_src, tvb, offset, 1, src);
}
offset++;
if (tree)
proto_tree_add_uint (tree, hf_arcnet_dst, tvb, offset, 1, dst);
offset++;
if (has_offset) {
if (tree)
proto_tree_add_item (tree, hf_arcnet_offset, tvb, offset, 2, FALSE);
offset += 2;
}
protID = tvb_get_guint8 (tvb, offset);
if (tree)
proto_tree_add_uint (tree, hf_arcnet_protID, tvb, offset, 1, protID);
offset++;
switch (protID) {
case ARCNET_PROTO_IP_1051:
case ARCNET_PROTO_ARP_1051:
case ARCNET_PROTO_DIAGNOSE:
case ARCNET_PROTO_BACNET: /* XXX - no fragmentation? */
/* No fragmentation stuff in the header */
break;
default:
/*
* Show the fragmentation stuff - flag and sequence ID.
*
* XXX - on at least some versions of NetBSD, it appears that
* we might get ARCNET frames, not reassembled packets; if so,
* we should reassemble them.
*
* XXX - but on FreeBSD it appears that we get reassembled packets
* on input (but apparently we get frames on output - or maybe
* we get the packet *and* all its frames!); how to tell the
* difference? It looks from the FreeBSD reassembly code as if
* the reassembled packet arrives with the header for the first
* frame. It also looks as if, on output, we first get the
* full packet, with a header containing none of the fragmentation
* stuff, and then get the frames.
*
* On Linux, we get only reassembled packets, and the exception
* frame stuff is hidden - there's a split flag and sequence
* number, but it appears that it will never have the exception
* frame stuff.
*
* XXX - what about OpenBSD? And, for that matter, what about
* Windows? (I suspect Windows supplies reassembled frames,
* as WinPcap, like PF_PACKET sockets, taps into the networking
* stack just as other protocols do.)
*/
split_flag = tvb_get_guint8 (tvb, offset);
if (has_exception && split_flag == 0xff) {
/* This is an exception packet. The flag value there is the
"this is an exception flag" packet; the next two bytes
after it are padding. */
if (tree) {
proto_tree_add_uint (tree, hf_arcnet_exception_flag, tvb, offset, 1,
split_flag);
}
offset++;
if (tree)
proto_tree_add_text (tree, tvb, offset, 2, "Padding");
offset += 2;
/* Another copy of the packet type appears after the padding. */
if (tree)
proto_tree_add_item (tree, hf_arcnet_protID, tvb, offset, 1, FALSE);
offset++;
/* And after that comes the real split flag. */
split_flag = tvb_get_guint8 (tvb, offset);
}
if (tree) {
proto_tree_add_uint (tree, hf_arcnet_split_flag, tvb, offset, 1,
split_flag);
}
offset++;
if (tree)
proto_tree_add_item (tree, hf_arcnet_sequence, tvb, offset, 2, FALSE);
offset += 2;
break;
}
/* Set the length of the ARCNET header protocol tree item. */
if (tree)
proto_item_set_len(ti, offset);
next_tvb = tvb_new_subset (tvb, offset, -1, -1);
if (!dissector_try_port (arcnet_dissector_table, protID,
next_tvb, pinfo, tree))
{
if (check_col (pinfo->cinfo, COL_PROTOCOL))
{
col_add_fstr (pinfo->cinfo, COL_PROTOCOL, "0x%04x", protID);
}
call_dissector (data_handle, next_tvb, pinfo, tree);
}
}
/*
* BSD-style ARCNET headers - they don't have the offset field from the
* ARCNET hardware packet, but we might get an exception frame header.
*/
static void
dissect_arcnet (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
{
dissect_arcnet_common (tvb, pinfo, tree, FALSE, TRUE);
}
/*
* Linux-style ARCNET headers - they *do* have the offset field from the
* ARCNET hardware packet, but we should never see an exception frame
* header.
*/
static void
dissect_arcnet_linux (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
{
dissect_arcnet_common (tvb, pinfo, tree, TRUE, FALSE);
}
static const value_string arcnet_prot_id_vals[] = {
{ARCNET_PROTO_IP_1051, "RFC 1051 IP"},
{ARCNET_PROTO_ARP_1051, "RFC 1051 ARP"},
{ARCNET_PROTO_IP_1201, "RFC 1201 IP"},
{ARCNET_PROTO_ARP_1201, "RFC 1201 ARP"},
{ARCNET_PROTO_RARP_1201, "RFC 1201 RARP"},
{ARCNET_PROTO_IPX, "IPX"},
{ARCNET_PROTO_NOVELL_EC, "Novell of some sort"},
{ARCNET_PROTO_IPv6, "IPv6"},
{ARCNET_PROTO_ETHERNET, "Encapsulated Ethernet"},
{ARCNET_PROTO_DATAPOINT_BOOT, "Datapoint boot"},
{ARCNET_PROTO_DATAPOINT_MOUNT, "Datapoint mount"},
{ARCNET_PROTO_POWERLAN_BEACON, "PowerLAN beacon"},
{ARCNET_PROTO_POWERLAN_BEACON2, "PowerLAN beacon2"},
{ARCNET_PROTO_APPLETALK, "Appletalk"},
{ARCNET_PROTO_BANYAN, "Banyan VINES"},
{ARCNET_PROTO_DIAGNOSE, "Diagnose"},
{ARCNET_PROTO_BACNET, "BACnet"},
{0, NULL}
};
void
proto_register_arcnet (void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{&hf_arcnet_src,
{"Source", "arcnet.src",
FT_UINT8, BASE_HEX, NULL, 0,
"Source ID", HFILL}
},
{&hf_arcnet_dst,
{"Dest", "arcnet.dst",
FT_UINT8, BASE_HEX, NULL, 0,
"Dest ID", HFILL}
},
{&hf_arcnet_offset,
{"Offset", "arcnet.offset",
FT_BYTES, BASE_NONE, NULL, 0,
"Offset", HFILL}
},
{&hf_arcnet_protID,
{"Protocol ID", "arcnet.protID",
FT_UINT8, BASE_HEX, VALS(arcnet_prot_id_vals), 0,
"Proto type", HFILL}
},
{&hf_arcnet_split_flag,
{"Split Flag", "arcnet.split_flag",
FT_UINT8, BASE_DEC, NULL, 0,
"Split flag", HFILL}
},
{&hf_arcnet_exception_flag,
{"Exception Flag", "arcnet.exception_flag",
FT_UINT8, BASE_HEX, NULL, 0,
"Exception flag", HFILL}
},
{&hf_arcnet_sequence,
{"Sequence", "arcnet.sequence",
FT_UINT16, BASE_DEC, NULL, 0,
"Sequence number", HFILL}
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_arcnet,
};
arcnet_dissector_table = register_dissector_table ("arcnet.protocol_id",
"ARCNET Protocol ID",
FT_UINT8, BASE_HEX);
/* Register the protocol name and description */
proto_arcnet = proto_register_protocol ("ARCNET", "ARCNET", "arcnet");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array (proto_arcnet, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
}
void
proto_reg_handoff_arcnet (void)
{
dissector_handle_t arcnet_handle, arcnet_linux_handle;
arcnet_handle = create_dissector_handle (dissect_arcnet, proto_arcnet);
dissector_add ("wtap_encap", WTAP_ENCAP_ARCNET, arcnet_handle);
arcnet_linux_handle = create_dissector_handle (dissect_arcnet_linux,
proto_arcnet);
dissector_add ("wtap_encap", WTAP_ENCAP_ARCNET_LINUX, arcnet_linux_handle);
data_handle = find_dissector ("data");
}
View Git Blame Copy Permalink