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wireshark/epan/dissectors/packet-dpnss-link.c
Michael Mann f4b0abc729 Dissectors don't need a journey of self discovery. 
They already know who they are when they register themselves.  Saving the
handle then to avoid finding it later.
Not sure if this will increase unnecessary register_dissector functions
(instead of using create_dissector_handle in proto_reg_handoff function)
when other dissectors copy/paste, but it should make startup time
a few microseconds better.

Change-Id: I3839be791b32b84887ac51a6a65fb5733e9f1f43
Reviewed-on: https://code.wireshark.org/review/19481
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>
2016-12-31 07:31:42 +00:00

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/* packet-dpnss-link.c
* Routines for DPNSS/DASS2 link layer dissection
* Copyright 2009, Rolf Fiedler <rolf.fiedler[at]innoventif[dot]de>
*
* 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.
*/
/* References:
* BTNR188
* ND1301:2001/03 http://www.nicc.org.uk/nicc-public/Public/interconnectstandards/dpnss/nd1301_2004_11.pdf
*/
#include "config.h"
#include <epan/packet.h>
#include <wiretap/wtap.h>
void proto_register_dpnss_link(void);
void proto_reg_handoff_dpnss_link(void);
static dissector_handle_t dpnss_handle; /* DPNSS UI frame dissector */
#define LINK_HEADER_SIZE 3
static int proto_dpnss_link = -1;
static int hf_dpnss_link_address_framegroup = -1;
static int hf_dpnss_link_address_crbit = -1;
static int hf_dpnss_link_address_extension = -1;
static int hf_dpnss_link_address2_reserved = -1;
static int hf_dpnss_link_address2_dlcId = -1;
static int hf_dpnss_link_address2_dlcIdNr = -1;
static int hf_dpnss_link_address2_extension = -1;
static int hf_dpnss_link_control_frameType = -1;
static const value_string dpnss_link_framegroup_vals[] = {
{ 0x11, "Information Frame" },
{ 0x03, "Control Frame" },
{ 0, NULL }
};
static const value_string dpnss_link_crbit_vals[] = {
{ 0x0, "Command/Response Bit Cleared" },
{ 0x1, "Command/Response Bit Set" },
{ 0, NULL }
};
static const value_string dpnss_link_extend_vals[] = {
{ 0x0, "Extended to next octet" },
{ 0x1, "Final octet" },
{ 0, NULL }
};
static const value_string dpnss_link_reserved_vals[] = {
{ 0x0, "Reserved" },
{ 0x1, "Reserved" },
{ 0, NULL }
};
static const value_string dpnss_link_dlcId_vals[] = {
{ 0x0, "Real Channel" },
{ 0x1, "Virtual Channel" },
{ 0, NULL }
};
#define FRAME_TYPE_UI_EVEN 0x03
#define FRAME_TYPE_UI_ODD 0x13
#define FRAME_TYPE_SABMR 0xef
#define FRAME_TYPE_UA 0x63
static const value_string dpnss_link_frameType_vals[] = {
{ FRAME_TYPE_UI_EVEN, "UI (even)" },
{ FRAME_TYPE_UI_ODD, "UI (odd)" },
{ FRAME_TYPE_SABMR, "SABMR" },
{ FRAME_TYPE_UA, "UA" },
{ 0, NULL }
};
static int ett_dpnss_link = -1;
static dissector_handle_t dpnss_link_handle;
/* Code to actually dissect the packets */
static int
dissect_dpnss_link(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *item;
proto_tree *dpnss_link_tree;
guint8 octet;
tvbuff_t *protocol_data_tvb;
guint16 protocol_data_length;
gboolean uton;
uton = pinfo->pseudo_header->l1event.uton;
/* Make entries in src and dst column */
col_set_str(pinfo->cinfo, COL_DEF_SRC, uton?"TE":"NT");
col_set_str(pinfo->cinfo, COL_DEF_DST, uton?"NT":"TE");
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DPNSS");
item = proto_tree_add_item(tree, proto_dpnss_link, tvb, 0, -1, ENC_NA);
dpnss_link_tree = proto_item_add_subtree(item, ett_dpnss_link);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address_framegroup,
tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address_crbit,
tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address_extension,
tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address2_reserved,
tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address2_dlcId,
tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address2_dlcIdNr,
tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address2_extension,
tvb, 1, 1, ENC_BIG_ENDIAN);
/*
* XXX - DPNSS's layer 2 protocol appears to be Yet Another
* HDLC Derivative; should this use the xDLC control field
* dissector code?
*/
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_control_frameType,
tvb, 2, 1, ENC_BIG_ENDIAN);
octet = tvb_get_guint8(tvb, 2);
switch (octet){
case FRAME_TYPE_UI_EVEN:
case FRAME_TYPE_UI_ODD:
protocol_data_length=tvb_reported_length(tvb)-LINK_HEADER_SIZE;
protocol_data_tvb=tvb_new_subset_length(tvb, LINK_HEADER_SIZE,
protocol_data_length);
if (dpnss_handle && protocol_data_length>0) {
call_dissector(dpnss_handle, protocol_data_tvb, pinfo, tree);
}
break;
default:
break;
}
return tvb_captured_length(tvb);
}
/* Register the protocol with Wireshark */
void
proto_register_dpnss_link(void)
{
static hf_register_info hf[] = {
{ &hf_dpnss_link_address_framegroup,
{ "Frame Group", "dpnss_link.framegroup",
FT_UINT8, BASE_DEC, VALS(dpnss_link_framegroup_vals), 0xfc,
NULL, HFILL }
},
{ &hf_dpnss_link_address_crbit,
{ "C/R Bit", "dpnss_link.crbit",
FT_UINT8, BASE_DEC, VALS(dpnss_link_crbit_vals), 0x02,
NULL, HFILL }
},
{ &hf_dpnss_link_address_extension,
{ "Extension", "dpnss_link.extension",
FT_UINT8, BASE_DEC, VALS(dpnss_link_extend_vals), 0x01,
NULL, HFILL }
},
{ &hf_dpnss_link_address2_reserved,
{ "Reserved", "dpnss_link.reserved",
FT_UINT8, BASE_DEC, VALS(dpnss_link_reserved_vals), 0x80,
NULL, HFILL }
},
{ &hf_dpnss_link_address2_dlcId,
{ "DLC ID", "dpnss_link.dlcId",
FT_UINT8, BASE_DEC, VALS(dpnss_link_dlcId_vals), 0x40,
NULL, HFILL }
},
{ &hf_dpnss_link_address2_dlcIdNr,
{ "DLC ID Number", "dpnss_link.dlcIdNr",
FT_UINT8, BASE_DEC, NULL, 0x3e,
NULL, HFILL }
},
{ &hf_dpnss_link_address2_extension,
{ "Extension", "dpnss_link.extension2",
FT_UINT8, BASE_DEC, VALS(dpnss_link_extend_vals), 0x01,
NULL, HFILL }
},
{ &hf_dpnss_link_control_frameType,
{ "Frame Type", "dpnss_link.frameType",
FT_UINT8, BASE_DEC, VALS(dpnss_link_frameType_vals), 0xff,
NULL, HFILL }
}
};
static gint *ett[] = { &ett_dpnss_link };
/* Register the protocol name and description */
proto_dpnss_link = proto_register_protocol("Digital Private Signalling System No 1 Link Layer",
"DPNSS Link", "dpnss_link");
dpnss_link_handle = register_dissector("dpnss_link", dissect_dpnss_link, proto_dpnss_link);
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_dpnss_link, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_dpnss_link(void)
{
dissector_add_uint("wtap_encap", WTAP_ENCAP_DPNSS, dpnss_link_handle);
dpnss_handle = find_dissector_add_dependency("dpnss", proto_dpnss_link);
}
/*
* 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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