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/* packet-sita.c
* Routines for SITA protocol dissection (ALC, UTS, Frame Relay, X.25)
* with a SITA specific link layer information header
*
* Copyright 2007, Fulko Hew, SITA INC Canada, Inc.
*
* $Id$
*
* 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.
*/
/* Use tabstops = 4 */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <wiretap/wtap.h>
#include <epan/emem.h>
static dissector_table_t sita_dissector_table;
static dissector_handle_t data_handle;
static gint ett_sita = -1;
static gint ett_sita_flags = -1;
static gint ett_sita_signals = -1;
static gint ett_sita_errors1 = -1;
static gint ett_sita_errors2 = -1;
static int proto_sita = -1; /* Initialize the protocol and registered fields */
static int hf_dir = -1;
static int hf_framing = -1;
static int hf_parity = -1;
static int hf_collision = -1;
static int hf_longframe = -1;
static int hf_shortframe = -1;
static int hf_droppedframe = -1;
static int hf_nonaligned = -1;
static int hf_abort = -1;
static int hf_lostcd = -1;
static int hf_lostcts = -1;
static int hf_rxdpll = -1;
static int hf_overrun = -1;
static int hf_length = -1;
static int hf_crc = -1;
static int hf_break = -1;
static int hf_underrun = -1;
static int hf_uarterror = -1;
static int hf_rtxlimit = -1;
static int hf_proto = -1;
static int hf_dsr = -1;
static int hf_dtr = -1;
static int hf_cts = -1;
static int hf_rts = -1;
static int hf_dcd = -1;
#define MAX_FLAGS_LEN 64 /* max size of a 'flags' decoded string */
#define IOP "Local"
#define REMOTE "Remote"
static gchar *
format_flags_string(guchar value, const gchar *array[])
{
int i;
guint bpos;
emem_strbuf_t *buf;
const char *sep = "";
buf = ep_strbuf_sized_new(MAX_FLAGS_LEN, MAX_FLAGS_LEN);
for (i = 0; i < 8; i++) {
bpos = 1 << i;
if (value & bpos) {
if (array[i][0]) {
/* there is a string to emit... */
ep_strbuf_append_printf(buf, "%s%s", sep,
array[i]);
sep = ", ";
}
}
}
return buf->str;
}
static void
dissect_sita(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti;
guchar flags, signals, errors1, errors2, proto;
gchar *errors1_string, *errors2_string, *signals_string, *flags_string;
proto_tree *sita_tree = NULL;
proto_tree *sita_flags_tree = NULL;
proto_tree *sita_errors1_tree = NULL;
proto_tree *sita_errors2_tree = NULL;
proto_tree *sita_signals_tree = NULL;
const gchar *rx_errors1_str[] = {"Framing", "Parity", "Collision", "Long-frame", "Short-frame", "", "", "" };
const gchar *rx_errors2_str[] = {"Non-Aligned", "Abort", "CD-lost", "DPLL", "Overrun", "Length", "CRC", "Break" };
/*const gchar *tx_errors1_str[] = {"", "", "", "", "", "", "", "" }; */
const gchar *tx_errors2_str[] = {"Underrun", "CTS-lost", "UART", "ReTx-limit", "", "", "", "" };
const gchar *signals_str[] = {"DSR", "DTR", "CTS", "RTS", "DCD", "", "", "" };
const gchar *flags_str[] = {"", "", "", "", "", "", "", "No-buffers" };
col_clear(pinfo->cinfo, COL_PROTOCOL); /* erase the protocol */
col_clear(pinfo->cinfo, COL_INFO); /* and info columns so that the next decoder can fill them in */
flags = pinfo->pseudo_header->sita.flags;
signals = pinfo->pseudo_header->sita.signals;
errors1 = pinfo->pseudo_header->sita.errors1;
errors2 = pinfo->pseudo_header->sita.errors2;
proto = pinfo->pseudo_header->sita.proto;
if (check_col(pinfo->cinfo, COL_DEF_SRC)) {
if ((flags & SITA_FRAME_DIR) == SITA_FRAME_DIR_TXED) {
col_set_str(pinfo->cinfo, COL_DEF_SRC, IOP); /* set the source (direction) column accordingly */
} else {
col_set_str(pinfo->cinfo, COL_DEF_SRC, REMOTE);
}
}
if (check_col(pinfo->cinfo, COL_INFO))
col_set_str(pinfo->cinfo, COL_INFO, "");
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_sita, tvb, 0, 0, "Link Layer");
sita_tree = proto_item_add_subtree(ti, ett_sita);
proto_tree_add_uint(sita_tree, hf_proto, tvb, 0, 0, proto);
flags_string = format_flags_string(flags, flags_str);
ti = proto_tree_add_text(sita_tree, tvb, 0, 0, "Flags: 0x%02x (From %s)%s%s",
flags,
((flags & SITA_FRAME_DIR) == SITA_FRAME_DIR_TXED) ? IOP : REMOTE,
strlen(flags_string) ? ", " : "",
flags_string);
sita_flags_tree = proto_item_add_subtree(ti, ett_sita_flags);
proto_tree_add_boolean(sita_flags_tree, hf_droppedframe, tvb, 0, 0, flags);
proto_tree_add_boolean(sita_flags_tree, hf_dir, tvb, 0, 0, flags);
signals_string = format_flags_string(signals, signals_str);
ti = proto_tree_add_text(sita_tree, tvb, 0, 0, "Signals: 0x%02x %s", signals, signals_string);
sita_signals_tree = proto_item_add_subtree(ti, ett_sita_signals);
proto_tree_add_boolean(sita_signals_tree, hf_dcd, tvb, 0, 0, signals);
proto_tree_add_boolean(sita_signals_tree, hf_rts, tvb, 0, 0, signals);
proto_tree_add_boolean(sita_signals_tree, hf_cts, tvb, 0, 0, signals);
proto_tree_add_boolean(sita_signals_tree, hf_dtr, tvb, 0, 0, signals);
proto_tree_add_boolean(sita_signals_tree, hf_dsr, tvb, 0, 0, signals);
if ((flags & SITA_FRAME_DIR) == SITA_FRAME_DIR_RXED) {
errors1_string = format_flags_string(errors1, rx_errors1_str);
ti = proto_tree_add_text(sita_tree, tvb, 0, 0, "Receive Status: 0x%02x %s", errors1, errors1_string);
sita_errors1_tree = proto_item_add_subtree(ti, ett_sita_errors1);
proto_tree_add_boolean(sita_errors1_tree, hf_shortframe, tvb, 0, 0, errors1);
proto_tree_add_boolean(sita_errors1_tree, hf_longframe, tvb, 0, 0, errors1);
proto_tree_add_boolean(sita_errors1_tree, hf_collision, tvb, 0, 0, errors1);
proto_tree_add_boolean(sita_errors1_tree, hf_parity, tvb, 0, 0, errors1);
proto_tree_add_boolean(sita_errors1_tree, hf_framing, tvb, 0, 0, errors1);
errors2_string = format_flags_string(errors2, rx_errors2_str);
ti = proto_tree_add_text(sita_tree, tvb, 0, 0, "Receive Status: 0x%02x %s", errors2, errors2_string);
sita_errors2_tree = proto_item_add_subtree(ti, ett_sita_errors2);
proto_tree_add_boolean(sita_errors2_tree, hf_break, tvb, 0, 0, errors2);
proto_tree_add_boolean(sita_errors2_tree, hf_crc, tvb, 0, 0, errors2);
proto_tree_add_boolean(sita_errors2_tree, hf_length, tvb, 0, 0, errors2);
proto_tree_add_boolean(sita_errors2_tree, hf_overrun, tvb, 0, 0, errors2);
proto_tree_add_boolean(sita_errors2_tree, hf_rxdpll, tvb, 0, 0, errors2);
proto_tree_add_boolean(sita_errors2_tree, hf_lostcd, tvb, 0, 0, errors2);
proto_tree_add_boolean(sita_errors2_tree, hf_abort, tvb, 0, 0, errors2);
proto_tree_add_boolean(sita_errors2_tree, hf_nonaligned, tvb, 0, 0, errors2);
} else {
errors2_string = format_flags_string(errors2, tx_errors2_str);
ti = proto_tree_add_text(sita_tree, tvb, 0, 0, "Transmit Status: 0x%02x %s", errors2, errors2_string);
sita_errors1_tree = proto_item_add_subtree(ti, ett_sita_errors1);
proto_tree_add_boolean(sita_errors1_tree, hf_rtxlimit, tvb, 0, 0, errors2);
proto_tree_add_boolean(sita_errors1_tree, hf_uarterror, tvb, 0, 0, errors2);
proto_tree_add_boolean(sita_errors1_tree, hf_lostcts, tvb, 0, 0, errors2);
proto_tree_add_boolean(sita_errors1_tree, hf_underrun, tvb, 0, 0, errors2);
}
}
if (!dissector_try_uint(sita_dissector_table, pinfo->pseudo_header->sita.proto, tvb, pinfo, tree)) { /* try to find and run an applicable dissector */
if (check_col(pinfo->cinfo, COL_PROTOCOL)) /* if one can't be found... tell them we don't */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "UKNOWN"); /* know how to decode this protocol */
if (check_col(pinfo->cinfo, COL_INFO))
col_add_fstr(pinfo->cinfo, COL_INFO, "IOP protocol number: %u", pinfo->pseudo_header->sita.proto); /* and give them the details then */
call_dissector(data_handle, tvb, pinfo, tree); /* call the generic (hex display) decoder instead */
}
}
static const true_false_string tfs_sita_flags = { "From Remote", "From Local" };
static const true_false_string tfs_sita_error = { "Error", "" };
static const true_false_string tfs_sita_violation = { "Violation", "" };
static const true_false_string tfs_sita_received = { "Received", "" };
static const true_false_string tfs_sita_lost = { "Lost", "" };
static const true_false_string tfs_sita_exceeded = { "Exceeded", "" };
static const true_false_string tfs_sita_on_off = { "On", "Off" };
static const value_string tfs_sita_proto[] = {
{ SITA_PROTO_UNUSED, "Unused" },
{ SITA_PROTO_BOP_LAPB, "LAPB" },
{ SITA_PROTO_ETHERNET, "Ethernet" },
{ SITA_PROTO_ASYNC_INTIO, "Async (Interrupt I/O)" },
{ SITA_PROTO_ASYNC_BLKIO, "Async (Block I/O)" },
{ SITA_PROTO_ALC, "IPARS" },
{ SITA_PROTO_UTS, "UTS" },
{ SITA_PROTO_PPP_HDLC, "PPP/HDLC" },
{ SITA_PROTO_SDLC, "SDLC" },
{ SITA_PROTO_TOKENRING, "Token Ring" },
{ SITA_PROTO_I2C, "I2C" },
{ SITA_PROTO_DPM_LINK, "DPM Link" },
{ SITA_PROTO_BOP_FRL, "Frame Relay" },
{ 0, NULL }
};
void
proto_register_sita(void)
{
static hf_register_info hf[] = {
{ &hf_proto, { "Protocol", "sita.errors.protocol", FT_UINT8, BASE_HEX, VALS(tfs_sita_proto), 0, "Protocol value", HFILL }},
{ &hf_dir, { "Direction", "sita.flags.flags", FT_BOOLEAN, 8, TFS(&tfs_sita_flags), SITA_FRAME_DIR, "TRUE 'from Remote', FALSE 'from Local'", HFILL }},
{ &hf_droppedframe, { "No Buffers", "sita.flags.droppedframe", FT_BOOLEAN, 8, TFS(&tfs_sita_error), SITA_ERROR_NO_BUFFER, "TRUE if Buffer Failure", HFILL }},
{ &hf_framing, { "Framing", "sita.errors.framing", FT_BOOLEAN, 8, TFS(&tfs_sita_error), SITA_ERROR_RX_FRAMING, "TRUE if Framing Error", HFILL }},
{ &hf_parity, { "Parity", "sita.errors.parity", FT_BOOLEAN, 8, TFS(&tfs_sita_error), SITA_ERROR_RX_PARITY, "TRUE if Parity Error", HFILL }},
{ &hf_collision, { "Collision", "sita.errors.collision", FT_BOOLEAN, 8, TFS(&tfs_sita_error), SITA_ERROR_RX_COLLISION, "TRUE if Collision", HFILL }},
{ &hf_longframe, { "Long Frame", "sita.errors.longframe", FT_BOOLEAN, 8, TFS(&tfs_sita_error), SITA_ERROR_RX_FRAME_LONG, "TRUE if Long Frame Received", HFILL }},
{ &hf_shortframe, { "Short Frame", "sita.errors.shortframe", FT_BOOLEAN, 8, TFS(&tfs_sita_error), SITA_ERROR_RX_FRAME_SHORT, "TRUE if Short Frame", HFILL }},
{ &hf_nonaligned, { "NonAligned", "sita.errors.nonaligned", FT_BOOLEAN, 8, TFS(&tfs_sita_error), SITA_ERROR_RX_NONOCTET_ALIGNED, "TRUE if NonAligned Frame", HFILL }},
{ &hf_abort, { "Abort", "sita.errors.abort", FT_BOOLEAN, 8, TFS(&tfs_sita_received), SITA_ERROR_RX_ABORT, "TRUE if Abort Received", HFILL }},
{ &hf_lostcd, { "Carrier", "sita.errors.lostcd", FT_BOOLEAN, 8, TFS(&tfs_sita_lost), SITA_ERROR_RX_CD_LOST, "TRUE if Carrier Lost", HFILL }},
{ &hf_rxdpll, { "DPLL", "sita.errors.rxdpll", FT_BOOLEAN, 8, TFS(&tfs_sita_error), SITA_ERROR_RX_DPLL, "TRUE if DPLL Error", HFILL }},
{ &hf_overrun, { "Overrun", "sita.errors.overrun", FT_BOOLEAN, 8, TFS(&tfs_sita_error), SITA_ERROR_RX_OVERRUN, "TRUE if Overrun Error", HFILL }},
{ &hf_length, { "Length", "sita.errors.length", FT_BOOLEAN, 8, TFS(&tfs_sita_violation),SITA_ERROR_RX_FRAME_LEN_VIOL, "TRUE if Length Violation", HFILL }},
{ &hf_crc, { "CRC", "sita.errors.crc", FT_BOOLEAN, 8, TFS(&tfs_sita_error), SITA_ERROR_RX_CRC, "TRUE if CRC Error", HFILL }},
{ &hf_break, { "Break", "sita.errors.break", FT_BOOLEAN, 8, TFS(&tfs_sita_received), SITA_ERROR_RX_BREAK, "TRUE if Break Received", HFILL }},
{ &hf_underrun, { "Underrun", "sita.errors.underrun", FT_BOOLEAN, 8, TFS(&tfs_sita_error), SITA_ERROR_TX_UNDERRUN, "TRUE if Tx Underrun", HFILL }},
{ &hf_lostcts, { "Clear To Send", "sita.errors.lostcts", FT_BOOLEAN, 8, TFS(&tfs_sita_lost), SITA_ERROR_TX_CTS_LOST, "TRUE if Clear To Send Lost", HFILL }},
{ &hf_uarterror, { "UART", "sita.errors.uarterror", FT_BOOLEAN, 8, TFS(&tfs_sita_error), SITA_ERROR_TX_UART_ERROR, "TRUE if UART Error", HFILL }},
{ &hf_rtxlimit, { "Retx Limit", "sita.errors.rtxlimit", FT_BOOLEAN, 8, TFS(&tfs_sita_exceeded), SITA_ERROR_TX_RETX_LIMIT, "TRUE if Retransmit Limit reached", HFILL }},
{ &hf_dsr, { "DSR", "sita.signals.dsr", FT_BOOLEAN, 8, TFS(&tfs_sita_on_off), SITA_SIG_DSR, "TRUE if Data Set Ready", HFILL }},
{ &hf_dtr, { "DTR", "sita.signals.dtr", FT_BOOLEAN, 8, TFS(&tfs_sita_on_off), SITA_SIG_DTR, "TRUE if Data Terminal Ready", HFILL }},
{ &hf_cts, { "CTS", "sita.signals.cts", FT_BOOLEAN, 8, TFS(&tfs_sita_on_off), SITA_SIG_CTS, "TRUE if Clear To Send", HFILL }},
{ &hf_rts, { "RTS", "sita.signals.rts", FT_BOOLEAN, 8, TFS(&tfs_sita_on_off), SITA_SIG_RTS, "TRUE if Request To Send", HFILL }},
{ &hf_dcd, { "DCD", "sita.signals.dcd", FT_BOOLEAN, 8, TFS(&tfs_sita_on_off), SITA_SIG_DCD, "TRUE if Data Carrier Detect", HFILL }},
};
static gint *ett[] = {
&ett_sita,
&ett_sita_flags,
&ett_sita_signals,
&ett_sita_errors1,
&ett_sita_errors2,
};
proto_sita = proto_register_protocol("Societe Internationale de Telecommunications Aeronautiques", "SITA", "sita"); /* name, short name,abbreviation */
sita_dissector_table = register_dissector_table("sita.proto", "SITA protocol number", FT_UINT8, BASE_HEX);
proto_register_field_array(proto_sita, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("sita", dissect_sita, proto_sita);
}
void
proto_reg_handoff_sita(void)
{
dissector_handle_t lapb_handle;
dissector_handle_t frame_relay_handle;
dissector_handle_t uts_handle;
dissector_handle_t ipars_handle;
dissector_handle_t sita_handle;
lapb_handle = find_dissector("lapb");
frame_relay_handle = find_dissector("fr");
uts_handle = find_dissector("uts");
ipars_handle = find_dissector("ipars");
sita_handle = find_dissector("sita");
data_handle = find_dissector("data");
dissector_add_uint("sita.proto", SITA_PROTO_BOP_LAPB, lapb_handle);
dissector_add_uint("sita.proto", SITA_PROTO_BOP_FRL, frame_relay_handle);
dissector_add_uint("sita.proto", SITA_PROTO_UTS, uts_handle);
dissector_add_uint("sita.proto", SITA_PROTO_ALC, ipars_handle);
dissector_add_uint("wtap_encap", WTAP_ENCAP_SITA, sita_handle);
}
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