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wireshark/epan/dissectors/packet-lanforge.c
Michael Mann 1e60d63c8c Create call_data_dissector() to call data dissector. 
This saves many dissectors the need to find the data dissector and store a handle to it.

There were also some that were finding it, but not using it.
For others this was the only reason for their handoff function, so it could be eliminated.

Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b
Reviewed-on: https://code.wireshark.org/review/14530
Petri-Dish: Michael Mann <mmann78@netscape.net>
Reviewed-by: Michael Mann <mmann78@netscape.net>
2016-03-20 17:38:03 +00:00

296 lines
8.7 KiB
C
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/* packet-lanforge.c
* Routines for "LANforge traffic generator IP protocol" dissection
* Copyright 2008
* Ben Greear <greearb@candelatech.com>
*
* Based on pktgen dissectory by:
* Francesco Fondelli <francesco dot fondelli, gmail dot 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.
*/
/* LANforge generates network traffic for load & performance testing.
* See http://www.candelatech.com for more info.
*/
#include "config.h"
#include <epan/packet.h>
void proto_register_lanforge(void);
void proto_reg_handoff_lanforge(void);
/* magic num used for heuristic */
#define LANFORGE_MAGIC 0x1a2b3c4d
/* Initialize the protocol and registered fields */
static int proto_lanforge = -1;
/* lanforge header */
static int hf_lanforge_crc = -1;
static int hf_lanforge_magic = -1;
static int hf_lanforge_src_session = -1;
static int hf_lanforge_dst_session = -1;
static int hf_lanforge_pld_len_l = -1;
static int hf_lanforge_pld_len_h = -1;
static int hf_lanforge_pld_len = -1;
static int hf_lanforge_pld_pattern = -1;
static int hf_lanforge_seq = -1;
static int hf_lanforge_tx_time_s = -1;
static int hf_lanforge_tx_time_ns = -1;
static int hf_lanforge_timestamp = -1;
/* Initialize the subtree pointer */
static gint ett_lanforge = -1;
/* entry point */
static gboolean dissect_lanforge(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
proto_item *ti;
proto_item *tmp;
proto_tree *lanforge_tree;
guint32 offset = 0;
nstime_t tstamp;
guint32 tss;
guint32 tmpi;
guint32 pld_len, magic;
/* check for min size */
if(tvb_captured_length(tvb) < 28) { /* Not a LANforge packet. */
return FALSE;
}
/* check for magic number */
magic = tvb_get_ntohl(tvb,0);
if(magic != LANFORGE_MAGIC){
/* Not a LANforge packet. */
return FALSE;
}
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LANforge");
col_add_fstr(pinfo->cinfo, COL_INFO, "Seq: %u", tvb_get_ntohl(tvb, 16));
if(tree) {
/* create display subtree for the protocol */
ti = proto_tree_add_item(tree, proto_lanforge, tvb, 0, -1, ENC_NA);
lanforge_tree = proto_item_add_subtree(ti, ett_lanforge);
/* add items to the subtree */
proto_tree_add_item(lanforge_tree, hf_lanforge_crc, tvb, offset, 4, ENC_BIG_ENDIAN);
offset+=4;
proto_tree_add_item(lanforge_tree, hf_lanforge_magic, tvb, offset, 4, ENC_BIG_ENDIAN);
offset+=4;
proto_tree_add_item(lanforge_tree, hf_lanforge_src_session, tvb, offset, 2, ENC_BIG_ENDIAN);
offset+=2;
proto_tree_add_item(lanforge_tree, hf_lanforge_dst_session, tvb, offset, 2, ENC_BIG_ENDIAN);
offset+=2;
pld_len = tvb_get_ntohs(tvb, offset);
tmp = proto_tree_add_item(lanforge_tree, hf_lanforge_pld_len_l, tvb, offset, 2, ENC_BIG_ENDIAN);
PROTO_ITEM_SET_GENERATED(tmp);
offset+=2;
tmpi = tvb_get_guint8(tvb, offset);
tmp = proto_tree_add_item(lanforge_tree, hf_lanforge_pld_len_h, tvb, offset, 1, ENC_BIG_ENDIAN);
PROTO_ITEM_SET_GENERATED(tmp);
offset+=1;
pld_len |= (tmpi << 16);
proto_tree_add_uint(lanforge_tree, hf_lanforge_pld_len, tvb, offset-3, 3, pld_len);
proto_tree_add_item(lanforge_tree, hf_lanforge_pld_pattern, tvb, offset, 1, ENC_BIG_ENDIAN);
offset+=1;
proto_tree_add_item(lanforge_tree, hf_lanforge_seq, tvb, offset, 4, ENC_BIG_ENDIAN);
offset+=4;
tss = tvb_get_ntohl(tvb, offset);
tstamp.secs = tss;
tmp = proto_tree_add_item(lanforge_tree, hf_lanforge_tx_time_s, tvb, offset, 4, ENC_BIG_ENDIAN);
PROTO_ITEM_SET_GENERATED(tmp);
offset+=4;
tss = tvb_get_ntohl(tvb, offset);
tstamp.nsecs = tss;
tmp = proto_tree_add_item(lanforge_tree, hf_lanforge_tx_time_ns, tvb, offset, 4, ENC_BIG_ENDIAN);
PROTO_ITEM_SET_GENERATED(tmp);
offset+=4;
proto_tree_add_time(lanforge_tree, hf_lanforge_timestamp, tvb, offset - 8, 8, &tstamp);
if(tvb_reported_length_remaining(tvb, offset) > 0) /* random data */
call_data_dissector(tvb_new_subset_remaining(tvb, offset), pinfo,
lanforge_tree);
}
return TRUE;
}
/* Register the protocol with Wireshark */
void proto_register_lanforge(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_lanforge_crc,
{
"CRC", "lanforge.CRC",
FT_UINT32, BASE_HEX, NULL, 0x0,
"The LANforge CRC number", HFILL
}
},
{ &hf_lanforge_magic,
{
"Magic number", "lanforge.magic",
FT_UINT32, BASE_HEX, NULL, 0x0,
"The LANforge magic number", HFILL
}
},
{ &hf_lanforge_src_session,
{
"Source session ID", "lanforge.source-session-id",
FT_UINT16, BASE_DEC, NULL, 0x0,
"The LANforge source session ID", HFILL
}
},
{ &hf_lanforge_dst_session,
{
"Dest session ID", "lanforge.dest-session-id",
FT_UINT16, BASE_DEC, NULL, 0x0,
"The LANforge dest session ID", HFILL
}
},
{ &hf_lanforge_pld_len_l,
{
"Payload Length(L)", "lanforge.pld-len-L",
FT_UINT16, BASE_DEC, NULL, 0x0,
"The LANforge payload length (low bytes)", HFILL
}
},
{ &hf_lanforge_pld_len_h,
{
"Payload Length(H)", "lanforge.pld-len-H",
FT_UINT8, BASE_DEC, NULL, 0x0,
"The LANforge payload length (high byte)", HFILL
}
},
{ &hf_lanforge_pld_len,
{
"Payload Length", "lanforge.pld-length",
FT_UINT32, BASE_DEC, NULL, 0x0,
"The LANforge payload length", HFILL
}
},
{ &hf_lanforge_pld_pattern,
{
"Payload Pattern", "lanforge.pld-pattern",
FT_UINT16, BASE_DEC, NULL, 0x0,
"The LANforge payload pattern", HFILL
}
},
{ &hf_lanforge_seq,
{
"Sequence Number", "lanforge.seqno",
FT_UINT32, BASE_DEC, NULL, 0x0,
"The LANforge Sequence Number", HFILL
}
},
{ &hf_lanforge_tx_time_s,
{
"Timestamp Secs", "lanforge.ts-secs",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{ &hf_lanforge_tx_time_ns,
{
"Timestamp nsecs", "lanforge.ts-nsecs",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{ &hf_lanforge_timestamp,
{
"Timestamp", "lanforge.timestamp",
FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0,
NULL, HFILL
}
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_lanforge
};
/* Register the protocol name and description */
proto_lanforge = proto_register_protocol("LANforge Traffic Generator", "LANforge", "lanforge");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_lanforge, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void proto_reg_handoff_lanforge(void)
{
/* Register as a heuristic UDP dissector */
heur_dissector_add("udp", dissect_lanforge, "LANforge over UDP", "lanforge_udp", proto_lanforge, HEURISTIC_ENABLE);
heur_dissector_add("tcp", dissect_lanforge, "LANforge over TCP", "lanforge_tcp", proto_lanforge, HEURISTIC_ENABLE);
}
/*
* 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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