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wireshark/epan/dissectors/packet-e100.c
Guy Harris 59e6c9ed5e Fix construction of subset tvbuff. 
We should use both the captured length and original length, and we
should use them as the captured length and original length of the
tvbuff.

Clean up indentation and returning process while we're at it.

Change-Id: If7538268cd6ae557d9d5b85eefd57cf3e2e34a9e
Reviewed-on: https://code.wireshark.org/review/13366
Reviewed-by: Guy Harris <guy@alum.mit.edu>
2016-01-17 20:33:32 +00:00

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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("eth_withoutfcs");
}
/*
* 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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