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wireshark/epan/dissectors/packet-e100.c

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/* packet-e100.c
* Routines for Arbor Networks E100 packet encapsulation disassembly
*
* Copyright (c) 2009 by Bradley Higgins <bhiggins@arbor.net>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1999 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>
void proto_register_e100(void);
void proto_reg_handoff_e100(void);
static int proto_e100 = -1;
static dissector_handle_t eth_handle;
/* Dissector tree globals */
static int hf_e100_header = -1;
static int hf_e100_port = -1;
static int hf_e100_seq = -1;
static int hf_e100_ip = -1;
static int hf_e100_mon_pkt_id = -1;
static int hf_e100_pkt_ts = -1;
static int hf_e100_bytes_cap = -1;
static int hf_e100_bytes_orig = -1;
static gint ett_e100 = -1;
/* E100 encapsulated packet offsets */
typedef struct _e100_encap
{
guint offset;
guint len;
} e100_encap;
static e100_encap e100_header_ver = {0, 1};
static e100_encap e100_port_recv = {1, 1};
static e100_encap e100_seq = {2, 2};
static e100_encap e100_ip = {4, 4};
static e100_encap e100_mon_pkt_id = {8, 4};
static e100_encap e100_ts = {12, 8};
static e100_encap e100_bytes_cap = {20, 4};
static e100_encap e100_bytes_orig = {24, 4};
static guint e100_encap_len = 28;
static int
dissect_e100(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
tvbuff_t *next_tvb = NULL;
/* heuristic testing:
* (1) tvb packet is larger than e100 packet
* (2) e100 header is 1
* (3) e100 capture size matches tvb packet size
*/
if (tvb_captured_length(tvb) >= e100_encap_len &&
tvb_get_guint8(tvb, e100_header_ver.offset) == 1 &&
tvb_get_ntohl(tvb, e100_bytes_cap.offset) == tvb_reported_length(tvb)-e100_encap_len)
{
/* This looks like one of our packets. */
guint32 bytes_captured;
guint32 bytes_original;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "e100");
col_set_str(pinfo->cinfo, COL_INFO, "E100 Encapsulated Packet");
if (tree)
{
/* pick apart protocol for display */
proto_item *ti = NULL;
proto_tree *e100_tree = NULL;
ti = proto_tree_add_item(tree, proto_e100, tvb, 0, e100_encap_len, ENC_NA);
e100_tree = proto_item_add_subtree(ti, ett_e100);
proto_tree_add_item(e100_tree, hf_e100_header, tvb,
e100_header_ver.offset, e100_header_ver.len, ENC_BIG_ENDIAN);
proto_tree_add_item(e100_tree, hf_e100_port, tvb,
e100_port_recv.offset, e100_port_recv.len, ENC_BIG_ENDIAN);
proto_tree_add_item(e100_tree, hf_e100_seq, tvb,
e100_seq.offset, e100_seq.len, ENC_BIG_ENDIAN);
proto_tree_add_item(e100_tree, hf_e100_ip, tvb,
e100_ip.offset, e100_ip.len, ENC_BIG_ENDIAN);
proto_tree_add_item(e100_tree, hf_e100_mon_pkt_id, tvb,
e100_mon_pkt_id.offset, e100_mon_pkt_id.len, ENC_BIG_ENDIAN);
{
nstime_t ts;
ts.secs = tvb_get_ntohl(tvb, e100_ts.offset);
ts.nsecs = tvb_get_ntohl(tvb, e100_ts.offset+4)*1000;
proto_tree_add_time(e100_tree, hf_e100_pkt_ts, tvb,
e100_ts.offset, e100_ts.len, &ts);
}
proto_tree_add_item(e100_tree, hf_e100_bytes_cap, tvb,
e100_bytes_cap.offset, e100_bytes_cap.len, ENC_BIG_ENDIAN);
proto_tree_add_item(e100_tree, hf_e100_bytes_orig, tvb,
e100_bytes_orig.offset, e100_bytes_orig.len, ENC_BIG_ENDIAN);
} /* if(tree) */
bytes_captured = tvb_get_ntohl(tvb, e100_bytes_cap.offset);
bytes_original = tvb_get_ntohl(tvb, e100_bytes_orig.offset);
next_tvb = tvb_new_subset(tvb, e100_encap_len, bytes_captured, bytes_original);
call_dissector(eth_handle, next_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
else
{
/* Not one of our packets. */
return 0;
}
}
void
proto_register_e100(void)
{
static hf_register_info hf[] =
{
{ &hf_e100_header,
{ "Header Version",
"e100.version",
FT_UINT8,
BASE_DEC,
NULL, 0x0, NULL, HFILL
}
},
{ &hf_e100_port,
{ "E100 Port Received",
"e100.port_recv",
FT_UINT8,
BASE_DEC,
NULL, 0x0, NULL, HFILL
}
},
{ &hf_e100_seq,
{ "Sequence Number",
"e100.seq_num",
FT_UINT16,
BASE_DEC,
NULL, 0x0, NULL, HFILL
}
},
{ &hf_e100_ip,
{ "E100 IP Address",
"e100.ip",
FT_IPv4,
BASE_NONE,
NULL, 0x0, NULL, HFILL
}
},
{ &hf_e100_mon_pkt_id,
{ "Monitor Packet ID",
"e100.mon_pkt_id",
FT_UINT32,
BASE_DEC,
NULL, 0x0, NULL, HFILL
}
},
{ &hf_e100_pkt_ts,
{ "Packet Capture Timestamp",
"e100.pkt_ts",
FT_ABSOLUTE_TIME,
ABSOLUTE_TIME_LOCAL,
NULL, 0x0, NULL, HFILL
}
},
{ &hf_e100_bytes_cap,
{ "Bytes Captured",
"e100.bytes_cap",
FT_UINT32,
BASE_DEC,
NULL, 0x0, NULL, HFILL
}
},
{ &hf_e100_bytes_orig,
{ "Bytes in Original Packet",
"e100.bytes_orig",
FT_UINT32,
BASE_DEC,
NULL, 0x0, NULL, HFILL
}
}
};
/* Setup protocol subtree array */
static gint *ett[] =
{
&ett_e100
};
proto_e100 = proto_register_protocol("E100 Encapsulation", "E100", "e100");
proto_register_field_array(proto_e100, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_e100(void)
{
/* Check all UDP traffic, as the specific UDP port is configurable */
heur_dissector_add("udp", dissect_e100, "E100 over UDP", "e100_udp", proto_e100, HEURISTIC_ENABLE);
/* e100 traffic encapsulates traffic from the ethernet frame on */
eth_handle = find_dissector_add_dependency("eth_withoutfcs", proto_e100);
}
/*
* 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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