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wireshark/epan/dissectors/packet-sita.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

418 lines
18 KiB
C
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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.
*
* 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 indentation = 4 */
#include "config.h"
#include <epan/packet.h>
#include <wiretap/wtap.h>
void proto_register_sita(void);
void proto_reg_handoff_sita(void);
static dissector_table_t sita_dissector_table;
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;
static int hf_signals = -1;
#define MAX_FLAGS_LEN 64 /* max size of a 'flags' decoded string */
#define IOP "Local"
#define REMOTE "Remote"
static const gchar *
format_flags_string(guchar value, const gchar *array[])
{
int i;
guint bpos;
wmem_strbuf_t *buf;
const char *sep = "";
buf = wmem_strbuf_sized_new(wmem_packet_scope(), 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... */
wmem_strbuf_append_printf(buf, "%s%s", sep,
array[i]);
sep = ", ";
}
}
}
return wmem_strbuf_get_str(buf);
}
static int
dissect_sita(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti;
guchar flags, signals, errors1, errors2, proto;
const gchar *errors1_string, *errors2_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;
static const gchar *rx_errors1_str[] = {"Framing", "Parity", "Collision", "Long-frame", "Short-frame", "", "", "" };
static const gchar *rx_errors2_str[] = {"Non-Aligned", "Abort", "CD-lost", "DPLL", "Overrun", "Length", "CRC", "Break" };
#if 0
static const gchar *tx_errors1_str[] = {"", "", "", "", "", "", "", "" };
#endif
static const gchar *tx_errors2_str[] = {"Underrun", "CTS-lost", "UART", "ReTx-limit", "", "", "", "" };
static const gchar *flags_str[] = {"", "", "", "", "", "", "", "No-buffers" };
static const int * signal_flags[] = {
&hf_dcd,
&hf_rts,
&hf_cts,
&hf_dtr,
&hf_dsr,
NULL
};
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.sita_flags;
signals = pinfo->pseudo_header->sita.sita_signals;
errors1 = pinfo->pseudo_header->sita.sita_errors1;
errors2 = pinfo->pseudo_header->sita.sita_errors2;
proto = pinfo->pseudo_header->sita.sita_proto;
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);
}
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);
sita_flags_tree = proto_tree_add_subtree_format(sita_tree, tvb, 0, 0,
ett_sita_flags, NULL, "Flags: 0x%02x (From %s)%s%s",
flags,
((flags & SITA_FRAME_DIR) == SITA_FRAME_DIR_TXED) ? IOP : REMOTE,
strlen(flags_string) ? ", " : "",
flags_string);
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);
proto_tree_add_bitmask_value_with_flags(sita_tree, tvb, 0, hf_signals, ett_sita_signals,
signal_flags, signals, BMT_NO_FALSE|BMT_NO_TFS);
if ((flags & SITA_FRAME_DIR) == SITA_FRAME_DIR_RXED) {
errors1_string = format_flags_string(errors1, rx_errors1_str);
sita_errors1_tree = proto_tree_add_subtree_format(sita_tree, tvb, 0, 0,
ett_sita_errors1, NULL, "Receive Status: 0x%02x %s", errors1, errors1_string);
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);
sita_errors2_tree = proto_tree_add_subtree_format(sita_tree, tvb, 0, 0,
ett_sita_errors2, NULL, "Receive Status: 0x%02x %s", errors2, errors2_string);
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);
sita_errors1_tree = proto_tree_add_subtree_format(sita_tree, tvb, 0, 0,
ett_sita_errors1, NULL, "Transmit Status: 0x%02x %s", errors2, errors2_string);
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);
}
}
/* try to find and run an applicable dissector */
if (!dissector_try_uint(sita_dissector_table, pinfo->pseudo_header->sita.sita_proto, tvb, pinfo, tree)) {
/* if one can't be found... tell them we don't know how to decode this protocol
and give them the details then */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "UNKNOWN");
col_add_fstr(pinfo->cinfo, COL_INFO, "IOP protocol number: %u", pinfo->pseudo_header->sita.sita_proto);
call_data_dissector(tvb, pinfo, tree); /* call the generic (hex display) decoder instead */
}
return tvb_captured_length(tvb);
}
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 }
},
{ &hf_signals,
{ "Signals", "sita.signals",
FT_UINT8, BASE_HEX, NULL, 0,
NULL, 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", proto_sita, FT_UINT8, BASE_HEX, DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE);
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");
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);
}
/*
* 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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