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/* packet-uts.c
* Routines for UTS WAN protocol dissection
* Copyright 2007, Fulko Hew, SITA INC Canada, Inc.
*
* $Id$
*
* Copied from packet-ipars.c
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* Use tabstops = 4 */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <string.h>
#include <epan/packet.h>
#include <epan/emem.h>
#define SOH (0x01)
#define STX (0x02)
#define ETX (0x03)
#define EOT (0x04)
#define ENQ (0x05)
#define BEL (0x07)
#define NAK (0x15)
#define DLE (0x10)
#define GRID (0x20)
#define GSID (0x50)
#define GDID (0x70)
#define MAX_POLL_TYPE_MSG_SIZE (50)
static int proto_uts = -1;
static gint ett_uts = -1;
static gint ett_header_uts = -1;
static gint ett_trailer_uts = -1;
static int hf_rid = -1;
static int hf_sid = -1;
static int hf_did = -1;
static int hf_retxrequest = -1;
static int hf_ack = -1;
static int hf_replyrequest = -1;
static int hf_busy = -1;
static int hf_notbusy = -1;
static int hf_msgwaiting = -1;
static int hf_function = -1;
static int hf_data = -1;
#define MATCH (1)
#define FETCH (2)
#define SRC (1)
#define DST (2)
static int testchar(tvbuff_t *tvb, packet_info *pinfo _U_, int offset, int op, gchar match, gchar *storage)
{
gchar temp;
if (tvb_length_remaining(tvb, offset)) {
temp = tvb_get_guint8(tvb, offset) & 0x7f;
if (op == FETCH || (op == MATCH && temp == match)) {
if (storage != NULL) *storage = temp;
return 1;
} else {
return 0;
}
} else {
if (check_col(pinfo->cinfo, COL_INFO))
col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown Message Format");
return 0;
}
}
static void
set_addr(packet_info *pinfo _U_ , int field, gchar rid, gchar sid, gchar did)
{
if (field == SRC) {
if (check_col(pinfo->cinfo, COL_DEF_SRC)) col_append_fstr(pinfo->cinfo, COL_DEF_SRC, " %2.2X:%2.2X:%2.2X", rid, sid, did);
} else {
if (check_col(pinfo->cinfo, COL_DEF_DST)) col_append_fstr(pinfo->cinfo, COL_DEF_DST, " %2.2X:%2.2X:%2.2X", rid, sid, did);
}
}
static void
dissect_uts(tvbuff_t *tvb, packet_info *pinfo _U_ , proto_tree *tree)
{
proto_tree *uts_tree = NULL;
proto_tree *uts_header_tree = NULL;
proto_tree *uts_trailer_tree = NULL;
proto_item *ti;
int length;
gchar rid, sid, did;
gchar *msg_msg;
int offset = 0;
int header_length = -1;
int ack_start = 0;
int busy_start = 0;
int notbusy_start = 0;
int replyrequest_start = 0;
int function_start = 0;
int msgwaiting_start = 0;
int nak_start = 0;
int etx_start = 0;
int bcc_start = 0;
int stx_start = 0;
gchar function_code;
guint8 *data_ptr;
enum { NOTRAFFIC, OTHER } msg_type = OTHER;
msg_msg = ep_alloc(MAX_POLL_TYPE_MSG_SIZE);
msg_msg[0] = 0;
if (check_col(pinfo->cinfo, COL_PROTOCOL)) /* set the protocol column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "UTS");
if (testchar(tvb, pinfo, 0, MATCH, EOT, NULL) &&
testchar(tvb, pinfo, 1, MATCH, EOT, NULL) &&
testchar(tvb, pinfo, 2, MATCH, ETX, NULL)) {
msg_type = NOTRAFFIC;
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "No Traffic");
} else {
if (testchar(tvb, pinfo, 0, MATCH, SOH, NULL) &&
testchar(tvb, pinfo, 1, FETCH, 0, (gchar *)&rid) &&
testchar(tvb, pinfo, 2, FETCH, 0, (gchar *)&sid) &&
testchar(tvb, pinfo, 3, FETCH, 0, (gchar *)&did)) {
offset = 4;
if (testchar(tvb, pinfo, offset, MATCH, ETX, NULL)) {
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "General Poll");
set_addr(pinfo, DST, rid, sid, did);
} else if (testchar(tvb, pinfo, offset, MATCH, DLE, NULL) &&
testchar(tvb, pinfo, offset+1, MATCH, '1', NULL) &&
testchar(tvb, pinfo, offset+2, MATCH, ETX, NULL)) {
ack_start = offset;
if (sid == GSID && did == GDID) {
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "General Poll + ACK");
set_addr(pinfo, DST, rid, sid, did);
} else if (sid != GSID && did == GDID) {
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "Specific Poll + ACK");
set_addr(pinfo, DST, rid, sid, did);
} else if (sid != GSID && did != GDID) {
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "No Traffic + ACK");
set_addr(pinfo, SRC, rid, sid, did);
} else {
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "Unknown Message Format");
if ((pinfo->pseudo_header->sita.flags & SITA_FRAME_DIR) == SITA_FRAME_DIR_TXED) {
set_addr(pinfo, DST, rid, sid, did); /* if the ACN sent it, the address is of the destination... the terminal */
} else {
set_addr(pinfo, SRC, rid, sid, did); /* if the ACN received it, the address if of the source... the terminal */
}
}
} else if (testchar(tvb, pinfo, offset, MATCH, DLE, NULL) &&
testchar(tvb, pinfo, offset+1, MATCH, NAK, NULL) &&
testchar(tvb, pinfo, offset+2, MATCH, ETX, NULL) &&
sid != GSID && did == GDID) {
nak_start = offset;
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "Retransmit Request");
set_addr(pinfo, DST, rid, sid, did);
} else if (testchar(tvb, pinfo, offset, MATCH, BEL, NULL) &&
testchar(tvb, pinfo, offset+1, MATCH, STX, NULL) &&
testchar(tvb, pinfo, offset+2, MATCH, ETX, NULL)) {
header_length = offset+2;
msgwaiting_start = offset;
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "Message Waiting");
set_addr(pinfo, DST, rid, sid, did);
} else if (testchar(tvb, pinfo, offset, MATCH, DLE, NULL) &&
testchar(tvb, pinfo, offset+1, MATCH, '1', NULL) &&
testchar(tvb, pinfo, offset+2, MATCH, STX, NULL)) {
ack_start = offset;
header_length = offset+3;
stx_start = offset+2;
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "Text + ACK");
set_addr(pinfo, SRC, rid, sid, did);
} else if (testchar(tvb, pinfo, offset, MATCH, STX, NULL)) {
header_length = offset+1;
stx_start = offset;
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "Text");
if ((pinfo->pseudo_header->sita.flags & SITA_FRAME_DIR) == SITA_FRAME_DIR_TXED) {
set_addr(pinfo, DST, rid, sid, did); /* if the ACN sent it, the address is of the destination... the terminal */
} else {
set_addr(pinfo, SRC, rid, sid, did); /* if the ACN received it, the address if of the source... the terminal */
}
} else if (testchar(tvb, pinfo, offset, MATCH, DLE, NULL) &&
testchar(tvb, pinfo, offset+1, MATCH, ENQ, NULL) &&
testchar(tvb, pinfo, offset+2, MATCH, ETX, NULL)) {
replyrequest_start = offset;
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "Reply Request");
set_addr(pinfo, SRC, rid, sid, did);
} else if (testchar(tvb, pinfo, offset, MATCH, DLE, NULL) &&
testchar(tvb, pinfo, offset+1, MATCH, '?', NULL) &&
testchar(tvb, pinfo, offset+2, MATCH, ETX, NULL)) {
busy_start = offset;
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "Busy");
set_addr(pinfo, SRC, rid, sid, did);
} else if (testchar(tvb, pinfo, offset, MATCH, DLE, NULL) &&
testchar(tvb, pinfo, offset+1, MATCH, ';', NULL) &&
testchar(tvb, pinfo, offset+2, MATCH, ETX, NULL)) {
notbusy_start = offset;
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "Not Busy");
set_addr(pinfo, SRC, rid, sid, did);
} else if (testchar(tvb, pinfo, offset, MATCH, DLE, NULL) &&
testchar(tvb, pinfo, offset+1, MATCH, '1', NULL) &&
testchar(tvb, pinfo, offset+2, MATCH, DLE, NULL) &&
testchar(tvb, pinfo, offset+3, MATCH, ';', NULL) &&
testchar(tvb, pinfo, offset+4, MATCH, ETX, NULL)) {
notbusy_start = offset+2;
ack_start = offset;
g_snprintf(msg_msg, MAX_POLL_TYPE_MSG_SIZE, "Not Busy + ACK");
set_addr(pinfo, SRC, rid, sid, did);
} else if (testchar(tvb, pinfo, offset, MATCH, DLE, NULL) &&
testchar(tvb, pinfo, offset+1, MATCH, '1', NULL) &&
testchar(tvb, pinfo, offset+2, FETCH, 0, &function_code) &&
testchar(tvb, pinfo, offset+3, MATCH, ETX, NULL)) {
ack_start = offset;
function_start = offset + 2;
if (check_col(pinfo->cinfo, COL_INFO))
col_add_fstr(pinfo->cinfo, COL_INFO, "Function Message '%c' + ACK", function_code);
set_addr(pinfo, SRC, rid, sid, did);
} else if (testchar(tvb, pinfo, offset, FETCH, 0, &function_code) &&
testchar(tvb, pinfo, offset+1, MATCH, ETX, NULL)) {
function_start = offset;
if (check_col(pinfo->cinfo, COL_INFO))
col_add_fstr(pinfo->cinfo, COL_INFO, "Function Message '%c'", function_code);
set_addr(pinfo, SRC, rid, sid, did);
}
}
}
if ((check_col(pinfo->cinfo, COL_INFO)) && strlen(msg_msg))
col_add_str(pinfo->cinfo, COL_INFO, msg_msg);
while (tvb_length_remaining(tvb, offset)) { /* now look for the ETX */
if ((tvb_get_guint8(tvb, offset) & 0x7f) == ETX) {
if (header_length == -1) header_length = offset; /* the header ends at an STX, or if not found, the ETX */
etx_start = offset;
offset++;
break;
}
offset++;
}
if (tvb_length_remaining(tvb, offset)) /* if there is anything left, it could be the BCC and pads */
bcc_start = offset;
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_uts, tvb, 0, -1, "UTS");
uts_tree = proto_item_add_subtree(ti, ett_uts);
if (msg_type == NOTRAFFIC) {
proto_tree_add_protocol_format(uts_tree, proto_uts, tvb, 0, 2, "No Traffic");
proto_tree_add_protocol_format(uts_tree, proto_uts, tvb, 2, -1, "ETX + padding");
} else {
ti = proto_tree_add_text(uts_tree, tvb, 0, header_length, "Header");
uts_header_tree = proto_item_add_subtree(ti, ett_header_uts);
proto_tree_add_protocol_format(uts_header_tree, proto_uts, tvb, 0, 1, "SOH");
if (rid == GRID) proto_tree_add_uint_format(uts_header_tree, hf_rid, tvb, 1, 1, rid, "RID (%02X) (General)", rid );
else proto_tree_add_uint_format(uts_header_tree, hf_rid, tvb, 1, 1, rid, "RID (%02X)", rid );
if (sid == GSID) proto_tree_add_uint_format(uts_header_tree, hf_sid, tvb, 2, 1, sid, "SID (%02X) (General)", sid );
else proto_tree_add_uint_format(uts_header_tree, hf_sid, tvb, 2, 1, sid, "SID (%02X)", sid );
if (sid == GDID) proto_tree_add_uint_format(uts_header_tree, hf_did, tvb, 3, 1, did, "DID (%02X) (General)", did );
else proto_tree_add_uint_format(uts_header_tree, hf_did, tvb, 3, 1, did, "DID (%02X)", did );
if (nak_start) proto_tree_add_boolean_format(uts_header_tree, hf_retxrequest, tvb, nak_start, 2, 1, "Re-transmit Request");
if (ack_start) proto_tree_add_boolean_format(uts_header_tree, hf_ack, tvb, ack_start, 2, 1, "Ack");
if (replyrequest_start) proto_tree_add_boolean_format(uts_header_tree, hf_replyrequest, tvb, replyrequest_start, 2, 1, "Reply Request");
if (busy_start) proto_tree_add_boolean_format(uts_header_tree, hf_busy, tvb, busy_start, 2, 1, "Busy");
if (notbusy_start) proto_tree_add_boolean_format(uts_header_tree, hf_notbusy, tvb, notbusy_start, 2, 1, "Not Busy");
if (msgwaiting_start) proto_tree_add_boolean_format(uts_header_tree, hf_msgwaiting, tvb, msgwaiting_start, 1, 1, "Message Waiting");
if (function_start)
proto_tree_add_uint_format(uts_header_tree, hf_function, tvb, function_start, 1, function_code, "Function '%c'", function_code );
if (stx_start) {
proto_tree_add_protocol_format(uts_header_tree, proto_uts, tvb, stx_start, 1, "Start of Text" );
length = tvb_length_remaining(tvb, stx_start+1); /* find out how much message remains */
if (etx_start) length = (etx_start - stx_start - 1); /* and the data part is the rest... whatever preceeds the ETX if it exists */
data_ptr = tvb_get_ephemeral_string(tvb, stx_start+1, length); /* copy the string for dissecting */
proto_tree_add_string_format(uts_tree, hf_data, tvb, stx_start + 1, length, data_ptr, "Text (%d byte%s)", length, plurality(length, "", "s"));
}
if (etx_start) {
ti = proto_tree_add_text(uts_tree, tvb, etx_start, -1, "Trailer");
uts_trailer_tree = proto_item_add_subtree(ti, ett_trailer_uts);
if (etx_start) proto_tree_add_protocol_format(uts_trailer_tree, proto_uts, tvb, etx_start, 1, "ETX" );
if (bcc_start) proto_tree_add_protocol_format(uts_trailer_tree, proto_uts, tvb, bcc_start, -1, "CCC + padding" );
}
}
}
}
void
proto_register_uts(void)
{
static hf_register_info hf[] = {
{ &hf_rid, { "RID", "uts.rid", FT_UINT8, BASE_HEX, NULL, 0, "Remote Identifier address", HFILL }},
{ &hf_sid, { "SID", "uts.sid", FT_UINT8, BASE_HEX, NULL, 0, "Site Identifier address", HFILL }},
{ &hf_did, { "DID", "uts.did", FT_UINT8, BASE_HEX, NULL, 0, "Device Identifier address", HFILL }},
{ &hf_retxrequest, { "ReTxRequst", "uts.retxrequst", FT_BOOLEAN, BASE_NONE, NULL, 0, "TRUE if Re-transmit Request", HFILL }},
{ &hf_ack, { "Ack", "uts.ack", FT_BOOLEAN, BASE_NONE, NULL, 0, "TRUE if Ack", HFILL }},
{ &hf_replyrequest, { "ReplyRequst", "uts.replyrequest", FT_BOOLEAN, BASE_NONE, NULL, 0, "TRUE if Reply Request", HFILL }},
{ &hf_busy, { "Busy", "uts.busy", FT_BOOLEAN, BASE_NONE, NULL, 0, "TRUE if Busy", HFILL }},
{ &hf_notbusy, { "NotBusy", "uts.notbusy", FT_BOOLEAN, BASE_NONE, NULL, 0, "TRUE if Not Busy", HFILL }},
{ &hf_msgwaiting, { "MsgWaiting", "uts.msgwaiting", FT_BOOLEAN, BASE_NONE, NULL, 0, "TRUE if Message Waiting", HFILL }},
{ &hf_function, { "Function", "uts.function", FT_UINT8, BASE_HEX, NULL, 0, "Function Code value", HFILL }},
{ &hf_data, { "Data", "uts.data", FT_STRING, BASE_NONE, NULL, 0, "User Data Message", HFILL }},
};
static gint *ett[] = {
&ett_uts,
&ett_header_uts,
&ett_trailer_uts,
};
proto_uts = proto_register_protocol("Unisys Transmittal System", "UTS", "uts"); /* name, short name, abbrev */
proto_register_field_array(proto_uts, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("uts", dissect_uts, proto_uts);
}
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