osmith/wireshark
1
0
Fork 0
forked from osmocom/wireshark
Code Pull requests Releases Wiki Activity
wireshark/epan/dissectors/packet-esio.c
Michael Mann 2eb7b05b8c Convert most UDP dissectors to use "auto" preferences. 
Similar to the "tcp.port" changes in I99604f95d426ad345f4b494598d94178b886eb67,
convert dissectors that use "udp.port".

More cleanup done on dissectors that use both TCP and UDP dissector
tables, so that less preference callbacks exist.

Change-Id: If07be9b9e850c244336a7069599cd554ce312dd3
Reviewed-on: https://code.wireshark.org/review/18120
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>
2016-10-13 02:51:18 +00:00

439 lines
16 KiB
C
Raw Blame History

/* packet-esio.c
* Routines for Ether-S-I/O dissection (from Saia Burgess Controls AG )
* Copyright 2010, Christian Durrer <christian.durrer@sensemail.ch>
*
* 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 <epan/expert.h>
/* Telegram types*/
#define ESIO_TRANSFER 0x01
#define ESIO_STATUS 0x02
void proto_register_esio(void);
void proto_reg_handoff_esio(void);
#define ESIO_UDP_PORT 6060 /* Not IANA registered */
/* Initialize the protocol and registered fields */
static int proto_esio = -1;
static int hf_esio_type = -1;
static int hf_esio_version = -1;
static int hf_esio_length = -1;
static int hf_esio_transaction_id = -1;
static int hf_esio_tlg_id = -1;
static int hf_esio_src_stn_id = -1;
static int hf_esio_data_nbr = -1;
static int hf_esio_data_flags = -1;
static int hf_esio_data_transfer_id = -1;
static int hf_esio_data_dest_id = -1;
static int hf_esio_data_length = -1;
static int hf_esio_data = -1;
static int hf_esio_sts_type = -1;
static int hf_esio_sts_size = -1;
static int hf_esio_rio_sts = -1;
static int hf_esio_rio_tlgs_lost = -1;
static int hf_esio_rio_diag = -1;
static int hf_esio_rio_flags = -1;
/* Initialize the subtree pointers */
static gint ett_esio = -1;
static gint ett_esio_header = -1;
static gint ett_esio_transfer_header = -1;
static gint ett_esio_transfer_data = -1;
static gint ett_esio_data = -1;
static expert_field ei_esio_telegram_lost = EI_INIT;
/* value to string definitions*/
/* Ether-S-I/O telegram types*/
static const value_string esio_tlg_types[] = {
{0, "Reserved"},
{1, "Data transfer telegram"},
{2, "Status/Diag telegram"},
{0, NULL}
};
/* Status telegram types*/
static const value_string esio_sts_types[] = {
{0, "None"},
{1, "RIO status"},
{0, NULL}
};
/* check whether the packet looks like SBUS or not */
static gboolean
is_esio_pdu(tvbuff_t *tvb)
{
/* we need at least 8 bytes to determine whether this is
Ether-S-I/O or not*/
/* minimal length is 20 bytes*/
if (tvb_captured_length(tvb) < 20) {
return FALSE;
}
/* First four bytes must be "ESIO"*/
if (tvb_strneql(tvb, 0, "ESIO", 4) != 0) {
return FALSE;
}
/* fifth byte must be 0*/
if (tvb_get_guint8(tvb, 4) > 0x00) {
return FALSE;
}
/* sixth byte indicates telegram type and must be 0, 1 or 2*/
if (tvb_get_guint8(tvb, 5) > 0x02) {
return FALSE;
}
/* seventh byte must be 0*/
if (tvb_get_guint8(tvb, 6) > 0x00) {
return FALSE;
}
/* eight byte indicates telegram version and must be 0 (up to now)*/
if (tvb_get_guint8(tvb, 7) > 0x00) {
return FALSE;
}
/*header seems to be Ether-S-I/O*/
return TRUE;
}
/*Dissect the telegram*/
static int
dissect_esio(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti;
proto_tree *esio_tree, *esio_header_tree, *esio_transfer_header_tree,
*esio_data_tansfer_tree, *esio_data_tree;
gint i;
gint offset;
guint8 esio_nbr_data_transfers;
guint16 esio_telegram_type;
guint16 esio_tlg_type;
guint16 esio_transfer_length;
guint32 esio_transfer_dest_id;
guint32 esio_src_id;
guint32 esio_dst_id;
/* does this look like an sbus pdu? */
if (!is_esio_pdu(tvb)) {
return 0;
}
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ESIO");
col_clear(pinfo->cinfo, COL_INFO);
esio_telegram_type = tvb_get_guint8(tvb,5);
switch (esio_telegram_type) {
case ESIO_TRANSFER:
esio_src_id = tvb_get_ntohl(tvb,16);
esio_nbr_data_transfers = tvb_get_guint8(tvb, 20);
esio_dst_id = tvb_get_ntohl(tvb,26);
col_add_fstr( pinfo->cinfo, COL_INFO,
"Data transfer: Src ID: %d, Dst ID(s): %d",
esio_src_id, esio_dst_id);
if (esio_nbr_data_transfers > 1) {
col_append_str( pinfo->cinfo, COL_INFO,
" ...");
}
break;
case ESIO_STATUS:
esio_src_id = tvb_get_ntohl(tvb,16);
col_add_fstr( pinfo->cinfo, COL_INFO,
"Status/diag telegram: Src ID: %d",
esio_src_id);
break;
default:
/* All other telegrams */
col_set_str( pinfo->cinfo, COL_INFO,
"Unknown telegram");
break;
}
/* create display subtree for the protocol */
offset = 0;
ti = proto_tree_add_item(tree, proto_esio, tvb, offset, -1, ENC_NA);
esio_tree = proto_item_add_subtree(ti, ett_esio);
/*Add subtree for Ether-S-I/O header*/
esio_header_tree = proto_tree_add_subtree(esio_tree, tvb, offset, 12, ett_esio_header, NULL, "Ether-S-I/O header");
offset += 4; /*first four bytes are "ESIO"*/
/* add items to the Ether-S-I/O header subtree*/
esio_tlg_type = tvb_get_ntohs(tvb,offset);
proto_tree_add_item(esio_header_tree,
hf_esio_type, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(esio_header_tree,
hf_esio_version, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(esio_header_tree,
hf_esio_length, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(esio_header_tree,
hf_esio_transaction_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
switch (esio_tlg_type) {
case ESIO_TRANSFER:
if (tree) {
/*Add subtree for Ether-S-I/O header*/
esio_transfer_header_tree = proto_tree_add_subtree(esio_tree, tvb, offset, 12,
ett_esio_transfer_header, NULL, "Transfer header");
proto_tree_add_item(esio_transfer_header_tree,
hf_esio_tlg_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(esio_transfer_header_tree,
hf_esio_src_stn_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
esio_nbr_data_transfers = tvb_get_guint8(tvb,offset);
proto_tree_add_item(esio_transfer_header_tree,
hf_esio_data_nbr, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(esio_transfer_header_tree,
hf_esio_data_flags, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
for (i=((esio_nbr_data_transfers)); i>0; i--) {
/*Add subtree(s) for Ether-S-I/O data transfers*/
esio_transfer_dest_id = tvb_get_ntohl(tvb,(offset+4));
esio_transfer_length = tvb_get_ntohs(tvb,(offset+8));
esio_data_tansfer_tree = proto_tree_add_subtree_format(esio_tree, tvb, offset,
(esio_transfer_length + 10), ett_esio_transfer_data, NULL,
"Data transfer to ID: %d ", esio_transfer_dest_id);
proto_tree_add_item(esio_data_tansfer_tree,
hf_esio_data_transfer_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(esio_data_tansfer_tree,
hf_esio_data_dest_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(esio_data_tansfer_tree,
hf_esio_data_length, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
/*here comes the data*/
esio_data_tree = proto_tree_add_subtree(esio_data_tansfer_tree, tvb, offset,
esio_transfer_length, ett_esio_data, NULL, "Data bytes ");
for (i=((esio_transfer_length)); i>0; i--) {
proto_tree_add_item(esio_data_tree,
hf_esio_data, tvb, offset,
1, ENC_BIG_ENDIAN);
offset += 1;
}
}
} /* if (tree) */
break;
case ESIO_STATUS: {
proto_item *hi = NULL;
if (tree) {
proto_tree_add_item(esio_tree,
hf_esio_sts_type, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(esio_tree,
hf_esio_sts_size, tvb, offset+2, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(esio_tree,
hf_esio_src_stn_id, tvb, offset+4, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(esio_tree,
hf_esio_rio_sts, tvb, offset+8,
1, ENC_BIG_ENDIAN);
hi = proto_tree_add_item(esio_tree,
hf_esio_rio_tlgs_lost, tvb, offset+9,
1, ENC_BIG_ENDIAN);
proto_tree_add_item(esio_tree,
hf_esio_rio_diag, tvb, offset+10,
1, ENC_BIG_ENDIAN);
proto_tree_add_item(esio_tree,
hf_esio_rio_flags, tvb, offset+11, 1, ENC_BIG_ENDIAN);
} /* if (tree) */
if (tvb_get_guint8(tvb, offset + 9) > 0) {
expert_add_info(pinfo, hi, &ei_esio_telegram_lost);
}
break;
}
default:
break;
} /* switch() */
return tvb_captured_length(tvb);
/*End of dissect_sbus*/
}
/* Register the protocol with Wireshark */
void
proto_register_esio(void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_esio_type,
{ "Telegram type", "esio.type",
FT_UINT16, BASE_HEX, VALS(esio_tlg_types), 0,
NULL, HFILL }
},
{ &hf_esio_version,
{ "Version", "esio.vers",
FT_UINT16, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_length,
{ "Length (bytes)", "esio.len",
FT_UINT16, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_transaction_id,
{ "Transaction ID", "esio.transaction_id",
FT_UINT16, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_src_stn_id,
{ "Source station ID", "esio.src_stn_id",
FT_UINT32, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_tlg_id,
{ "Telegram ID", "esio.transfer.tlg_id",
FT_UINT32, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_data_nbr,
{ "Nbr. of data transfers", "esio.data.nbr",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_data_flags,
{ "Transfer header flags", "esio.data.flags",
FT_UINT8, BASE_HEX, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_data_transfer_id,
{ "Data transfer ID", "esio.data.transfer_id",
FT_UINT32, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_data_dest_id,
{ "Data destination ID", "esio.data.destination_id",
FT_UINT32, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_data_length,
{ "Data transfer length", "esio.data.length",
FT_UINT16, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_data,
{ "Data", "esio.data",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_sts_type,
{ "Status type", "esio.sts.type",
FT_UINT16, BASE_HEX, VALS(esio_sts_types), 0,
NULL, HFILL }
},
{ &hf_esio_sts_size,
{ "Status length (bytes)", "esio.sts.length",
FT_UINT16, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_rio_sts,
{ "RIO status", "esio.sts.rio_sts",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_rio_tlgs_lost,
{ "Lost telegrams to RIO", "esio.sts.rio_lost_tlg",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_rio_diag,
{ "RIO diagnostics", "esio.sts.rio_diag",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{ &hf_esio_rio_flags,
{ "RIO flags", "esio.sts.rio_flags",
FT_UINT8, BASE_HEX, NULL, 0,
NULL, HFILL }
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_esio,
&ett_esio_header,
&ett_esio_transfer_header,
&ett_esio_transfer_data,
&ett_esio_data
};
static ei_register_info ei[] = {
{ &ei_esio_telegram_lost, { "esio.telegram_lost", PI_SEQUENCE, PI_NOTE, "Telegram(s) lost", EXPFILL }},
};
expert_module_t* expert_esio;
/* Register the protocol name and description */
proto_esio = proto_register_protocol("SAIA Ether-S-I/O protocol", "ESIO", "esio");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_esio, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_esio = expert_register_protocol(proto_esio);
expert_register_field_array(expert_esio, ei, array_length(ei));
}
void
proto_reg_handoff_esio(void)
{
dissector_handle_t esio_handle;
esio_handle = create_dissector_handle(dissect_esio, proto_esio);
dissector_add_uint_with_preference("udp.port", ESIO_UDP_PORT, esio_handle);
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 7
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=7 tabstop=8 expandtab:
* :indentSize=7:tabSize=8:noTabs=true:
*/
View git blame Copy permalink