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wireshark/epan/dissectors/packet-idp.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

224 lines
6.3 KiB
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/* packet-idp.c
* Routines for XNS IDP
* Based on the Netware IPX dissector by Gilbert Ramirez <gram@alumni.rice.edu>
*
* 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 "packet-idp.h"
#include <epan/etypes.h>
void proto_register_idp(void);
void proto_reg_handoff_idp(void);
static int proto_idp = -1;
static int hf_idp_checksum = -1;
static int hf_idp_len = -1;
/* static int hf_idp_src = -1; */
/* static int hf_idp_dst = -1; */
static int hf_idp_hops = -1;
static int hf_idp_packet_type = -1;
static int hf_idp_dnet = -1;
static int hf_idp_dnode = -1;
static int hf_idp_dsocket = -1;
static int hf_idp_snet = -1;
static int hf_idp_snode = -1;
static int hf_idp_ssocket = -1;
static gint ett_idp = -1;
static dissector_table_t idp_type_dissector_table;
/*
* See
*
* "Internet Transport Protocols", XSIS 028112, December 1981
*
* if you can find it; this is based on the headers in the BSD XNS
* implementation.
*/
#define IDP_HEADER_LEN 30 /* It's *always* 30 bytes */
static const value_string idp_packet_type_vals[] = {
{ IDP_PACKET_TYPE_RIP, "RIP" },
{ IDP_PACKET_TYPE_ECHO, "Echo" },
{ IDP_PACKET_TYPE_ERROR, "Error" },
{ IDP_PACKET_TYPE_PEP, "PEP" },
{ IDP_PACKET_TYPE_SPP, "SPP" },
{ 0, NULL }
};
static const value_string idp_socket_vals[] = {
{ IDP_SOCKET_SMB, "SMB" },
{ 0, NULL }
};
static int
dissect_idp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *idp_tree;
proto_item *ti;
guint16 length;
guint8 type;
tvbuff_t *next_tvb;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "IDP");
col_clear(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item(tree, proto_idp, tvb, 0, IDP_HEADER_LEN, ENC_NA);
idp_tree = proto_item_add_subtree(ti, ett_idp);
proto_tree_add_checksum(idp_tree, tvb, 0, hf_idp_checksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
length = tvb_get_ntohs(tvb, 2);
proto_tree_add_uint_format_value(idp_tree, hf_idp_len, tvb, 2, 2, length,
"%u bytes", length);
/* Adjust the tvbuff length to include only the IDP datagram. */
set_actual_length(tvb, length);
proto_tree_add_item(idp_tree, hf_idp_hops, tvb, 4, 1, ENC_BIG_ENDIAN);
type = tvb_get_guint8(tvb, 5);
proto_tree_add_uint(idp_tree, hf_idp_packet_type, tvb, 5, 1, type);
pinfo->ptype = PT_IDP;
/* Destination */
proto_tree_add_item(idp_tree, hf_idp_dnet, tvb, 6, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(idp_tree, hf_idp_dnode, tvb, 10, 6, ENC_NA);
pinfo->destport = tvb_get_ntohs(tvb, 16);
proto_tree_add_uint(idp_tree, hf_idp_dsocket, tvb, 16, 2,
pinfo->destport);
/* Source */
proto_tree_add_item(idp_tree, hf_idp_snet, tvb, 18, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(idp_tree, hf_idp_snode, tvb, 22, 6, ENC_NA);
pinfo->srcport = tvb_get_ntohs(tvb, 28);
proto_tree_add_uint(idp_tree, hf_idp_ssocket, tvb, 28, 2,
pinfo->srcport);
/* Make the next tvbuff */
next_tvb = tvb_new_subset_remaining(tvb, IDP_HEADER_LEN);
/*
* Hand off to the dissector for the packet type.
*/
if (!dissector_try_uint(idp_type_dissector_table, type, next_tvb,
pinfo, tree))
{
call_data_dissector(next_tvb, pinfo, tree);
}
return tvb_captured_length(tvb);
}
void
proto_register_idp(void)
{
static hf_register_info hf_idp[] = {
{ &hf_idp_checksum,
{ "Checksum", "idp.checksum", FT_UINT16, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
#if 0
{ &hf_idp_src,
{ "Source Address", "idp.src", FT_STRING, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
#endif
#if 0
{ &hf_idp_dst,
{ "Destination Address", "idp.dst", FT_STRING, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
#endif
{ &hf_idp_len,
{ "Length", "idp.len", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
/* XXX - does this have separate hop count and time subfields? */
{ &hf_idp_hops,
{ "Transport Control (Hops)", "idp.hops", FT_UINT8, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_idp_packet_type,
{ "Packet Type", "idp.packet_type", FT_UINT8, BASE_DEC,
VALS(idp_packet_type_vals), 0x0, NULL, HFILL }},
{ &hf_idp_dnet,
{ "Destination Network","idp.dst.net", FT_UINT32, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{ &hf_idp_dnode,
{ "Destination Node", "idp.dst.node", FT_ETHER, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
{ &hf_idp_dsocket,
{ "Destination Socket", "idp.dst.socket", FT_UINT16, BASE_HEX,
VALS(idp_socket_vals), 0x0, NULL, HFILL }},
{ &hf_idp_snet,
{ "Source Network","idp.src.net", FT_UINT32, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{ &hf_idp_snode,
{ "Source Node", "idp.src.node", FT_ETHER, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
{ &hf_idp_ssocket,
{ "Source Socket", "idp.src.socket", FT_UINT16, BASE_HEX,
VALS(idp_socket_vals), 0x0, NULL, HFILL }},
};
static gint *ett[] = {
&ett_idp,
};
proto_idp = proto_register_protocol("Internetwork Datagram Protocol",
"IDP", "idp");
proto_register_field_array(proto_idp, hf_idp, array_length(hf_idp));
proto_register_subtree_array(ett, array_length(ett));
idp_type_dissector_table = register_dissector_table("idp.packet_type",
"IDP packet type", proto_idp, FT_UINT8, BASE_DEC);
}
void
proto_reg_handoff_idp(void)
{
dissector_handle_t idp_handle;
idp_handle = create_dissector_handle(dissect_idp, proto_idp);
dissector_add_uint("ethertype", ETHERTYPE_XNS_IDP, idp_handle);
dissector_add_uint("chdlc.protocol", ETHERTYPE_XNS_IDP, idp_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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