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/* packet-uts.c
* Routines for UTS WAN protocol dissection
* Copyright 2007, Fulko Hew, SITA INC Canada, Inc.
*
* Copied from packet-ipars.c
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* Use tabstops = 4 */
#include "config.h"
#include <epan/packet.h>
#include <wiretap/wtap.h>
#include <wsutil/str_util.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)
void proto_register_uts(void);
static int proto_uts;
static int ett_uts;
static int ett_header_uts;
static int ett_trailer_uts;
static int hf_rid;
static int hf_sid;
static int hf_did;
static int hf_retxrequest;
static int hf_ack;
static int hf_replyrequest;
static int hf_busy;
static int hf_notbusy;
static int hf_msgwaiting;
static int hf_function;
static int hf_data;
#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, char match, char *storage)
{
char temp;
if (tvb_bytes_exist(tvb, offset, 1)) {
temp = tvb_get_uint8(tvb, offset) & 0x7f;
if (op == FETCH || (op == MATCH && temp == match)) {
if (storage != NULL)
*storage = temp;
return 1;
} else {
return 0;
}
} else {
col_set_str(pinfo->cinfo, COL_INFO, "Unknown Message Format");
return 0;
}
}
static void
set_addr(packet_info *pinfo _U_ , int field, char rid, char sid, char did)
{
if (field == SRC) {
col_append_fstr(pinfo->cinfo, COL_DEF_SRC, " %2.2X:%2.2X:%2.2X", rid, sid, did);
} else {
col_append_fstr(pinfo->cinfo, COL_DEF_DST, " %2.2X:%2.2X:%2.2X", rid, sid, did);
}
}
static int
dissect_uts(tvbuff_t *tvb, packet_info *pinfo _U_ , proto_tree *tree, void* data _U_)
{
proto_tree *uts_tree = NULL;
proto_tree *uts_header_tree = NULL;
proto_tree *uts_trailer_tree = NULL;
proto_item *ti;
int length;
char rid = 0, sid = 0, did = 0;
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;
char function_code;
uint8_t *data_ptr;
enum { NOTRAFFIC, OTHER } msg_type = OTHER;
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;
col_set_str(pinfo->cinfo, COL_INFO, "No Traffic");
} else {
if (testchar(tvb, pinfo, 0, MATCH, SOH, NULL) &&
testchar(tvb, pinfo, 1, FETCH, 0, (char *)&rid) &&
testchar(tvb, pinfo, 2, FETCH, 0, (char *)&sid) &&
testchar(tvb, pinfo, 3, FETCH, 0, (char *)&did)) {
offset = 4;
if (testchar(tvb, pinfo, offset, MATCH, ETX, NULL)) {
col_set_str(pinfo->cinfo, COL_INFO, "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) {
col_set_str(pinfo->cinfo, COL_INFO, "General Poll + ACK");
set_addr(pinfo, DST, rid, sid, did);
} else if (sid != GSID && did == GDID) {
col_set_str(pinfo->cinfo, COL_INFO, "Specific Poll + ACK");
set_addr(pinfo, DST, rid, sid, did);
} else if (sid != GSID && did != GDID) {
col_set_str(pinfo->cinfo, COL_INFO, "No Traffic + ACK");
set_addr(pinfo, SRC, rid, sid, did);
} else {
col_set_str(pinfo->cinfo, COL_INFO, "Unknown Message Format");
if ((pinfo->pseudo_header->sita.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;
col_set_str(pinfo->cinfo, COL_INFO, "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;
col_set_str(pinfo->cinfo, COL_INFO, "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;
col_set_str(pinfo->cinfo, COL_INFO, "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;
col_set_str(pinfo->cinfo, COL_INFO, "Text");
if ((pinfo->pseudo_header->sita.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;
col_set_str(pinfo->cinfo, COL_INFO, "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;
col_set_str(pinfo->cinfo, COL_INFO, "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;
col_set_str(pinfo->cinfo, COL_INFO, "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;
col_set_str(pinfo->cinfo, COL_INFO, "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;
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;
col_add_fstr(pinfo->cinfo, COL_INFO, "Function Message '%c'", function_code);
set_addr(pinfo, SRC, rid, sid, did);
}
}
}
while (tvb_reported_length_remaining(tvb, offset) > 0) { /* now look for the ETX */
if ((tvb_get_uint8(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_reported_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 {
uts_header_tree = proto_tree_add_subtree(uts_tree, tvb, 0, header_length, ett_header_uts, NULL, "Header");
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 (did == 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_captured_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 precedes the ETX if it exists */
data_ptr = tvb_get_string_enc(pinfo->pool, tvb, stx_start+1, length, ENC_ASCII); /* 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) {
uts_trailer_tree = proto_tree_add_subtree(uts_tree, tvb, etx_start, -1, ett_trailer_uts, NULL, "Trailer");
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");
}
}
}
return tvb_captured_length(tvb);
}
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,
{ "ReTxRequest", "uts.retxrequest",
FT_BOOLEAN, BASE_NONE, NULL, 0x0, "true if Re-transmit Request", HFILL }},
{ &hf_ack,
{ "Ack", "uts.ack",
FT_BOOLEAN, BASE_NONE, NULL, 0x0, "true if Ack", HFILL }},
{ &hf_replyrequest,
{ "ReplyRequest", "uts.replyrequest",
FT_BOOLEAN, BASE_NONE, NULL, 0x0, "true if Reply Request", HFILL }},
{ &hf_busy,
{ "Busy", "uts.busy",
FT_BOOLEAN, BASE_NONE, NULL, 0x0, "true if Busy", HFILL }},
{ &hf_notbusy,
{ "NotBusy", "uts.notbusy",
FT_BOOLEAN, BASE_NONE, NULL, 0x0, "true if Not Busy", HFILL }},
{ &hf_msgwaiting,
{ "MsgWaiting", "uts.msgwaiting",
FT_BOOLEAN, BASE_NONE, NULL, 0x0, "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 int *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);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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