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wireshark/epan/dissectors/packet-slowprotocols.c
Guy Harris a4c8ebc18b Don't do any Decode As stuff for dissector tables not used with Decode As. 
Have all dissector tables have a "supports Decode As" flag, which
defaults to FALSE, and which is set to TRUE if a register_decode_as()
refers to it.

When adding a dissector to a dissector table with a given key, only add
it for Decode As if the dissector table supports it.

For non-FT_STRING dissector tables, always check for multiple entries
for the same protocol with different dissectors, and report an error if
we found them.

This means there's no need for the creator of a dissector table to
specify whether duplicates of that sort should be allowed - we always do
the check when registering something for "Decode As" (in a non-FT_STRING
dissector table), and just don't bother registering anything for "Decode
As" if the dissector table doesn't support "Decode As", so there's no
check done for those dissector tables.

Change-Id: I4a1fdea3bddc2af27a65cfbca23edc99b26c0eed
Reviewed-on: https://code.wireshark.org/review/17402
Petri-Dish: Guy Harris <guy@alum.mit.edu>
Reviewed-by: Guy Harris <guy@alum.mit.edu>
2016-08-31 00:08:01 +00:00

162 lines
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/* packet-slowprotocols.c
* Routines for EtherType (0x8809) Slow Protocols disassembly.
* IEEE Std 802.3, Annex 57A
*
* Copyright 2002 Steve Housley <steve_housley@3com.com>
* Copyright 2005 Dominique Bastien <dbastien@accedian.com>
* Copyright 2009 Artem Tamazov <artem.tamazov@telllabs.com>
* Copyright 2010 Roberto Morro <roberto.morro[AT]tilab.com>
* Copyright 2014 Philip Rosenberg-Watt <p.rosenberg-watt[at]cablelabs.com.>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/etypes.h>
#include <epan/slow_protocol_subtypes.h>
/* General declarations */
void proto_register_slow_protocols(void);
void proto_reg_handoff_slow_protocols(void);
static dissector_table_t slow_protocols_dissector_table;
static const value_string subtype_vals[] = {
{ LACP_SUBTYPE , "LACP" },
{ MARKER_SUBTYPE , "Marker Protocol" },
{ OAM_SUBTYPE , "OAM" },
{ OSSP_SUBTYPE , "Organization Specific Slow Protocol" },
{ 0, NULL }
};
/* Initialise the protocol and registered fields */
static int proto_slow = -1;
static int hf_slow_subtype = -1;
/* Initialise the subtree pointers */
static gint ett_slow = -1;
/*
* Name: dissect_slow_protocols
*
* Description:
* This function is used to dissect the slow protocols defined in IEEE802.3
* CSMA/CD. The current slow protocols subtypes are define in Annex 57A of
* the 802.3 document. In case of an unsupported slow protocol, we only
* fill the protocol and info columns.
*
* Input Arguments:
* tvb: buffer associated with the rcv packet (see tvbuff.h).
* pinfo: structure associated with the rcv packet (see packet_info.h).
* tree: the protocol tree associated with the rcv packet (see proto.h).
*
* Return Values:
* None
*/
static int
dissect_slow_protocols(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
guint8 subtype;
proto_tree *pdu_tree;
proto_item *pdu_item;
tvbuff_t *next_tvb;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Slow Protocols");
subtype = tvb_get_guint8(tvb, 0);
col_add_fstr(pinfo->cinfo, COL_INFO, "Subtype = %u", subtype);
if (tree)
{
pdu_item = proto_tree_add_item(tree, proto_slow, tvb, 0, 1, ENC_NA);
pdu_tree = proto_item_add_subtree(pdu_item, ett_slow);
/* Subtype */
proto_tree_add_item(pdu_tree, hf_slow_subtype, tvb, 0, 1, ENC_BIG_ENDIAN);
}
next_tvb = tvb_new_subset_remaining(tvb, 1);
if (!dissector_try_uint_new(slow_protocols_dissector_table, subtype,
next_tvb, pinfo, tree, TRUE, NULL))
call_data_dissector(next_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
/* Register the protocol with Wireshark */
void
proto_register_slow_protocols(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_slow_subtype,
{ "Slow Protocols subtype", "slow.subtype",
FT_UINT8, BASE_HEX, VALS(subtype_vals), 0x0,
NULL, HFILL }},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_slow,
};
/* Register the protocol name and description */
proto_slow = proto_register_protocol("Slow Protocols", "802.3 Slow protocols", "slow");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_slow, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* subdissector code */
slow_protocols_dissector_table = register_dissector_table("slow.subtype",
"Slow protocol subtype",
proto_slow, FT_UINT8, BASE_DEC);
}
void
proto_reg_handoff_slow_protocols(void)
{
dissector_handle_t slow_protocols_handle;
slow_protocols_handle = create_dissector_handle(dissect_slow_protocols, proto_slow);
dissector_add_uint("ethertype", ETHERTYPE_SLOW_PROTOCOLS, slow_protocols_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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