Internet DRAFT - draft-murphy-tn5250e
draft-murphy-tn5250e
TN3270E Working Group T. Murphy, Jr.
Internet Draft: <draft-murphy-tn5250e-01.txt> P. Rieth
Updates: RFC 1205 J. Stevens
Expiration Date: August, 1998 IBM Corporation
February 1998
5250 Telnet Enhancements
Status of this Memo
This document is an Internet Draft. Internet Drafts are working
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Copyright Notice
Copyright (C) The Internet Society (1998). All Rights Reserved.
Abstract
This draft describes the interface to the IBM 5250 Telnet server that
allows client Telnet to request a Telnet terminal or printer session
using a specific device name. If a requested device name is not
available, a method to retry the request using a new device name is
described. Methods to request specific Telnet session settings and
auto-signon function are also described.
By allowing a Telnet client to select the device name, the 5250
Telnet server opens the door for applications to set and/or extract
useful information about the Telnet client. Some possibilities are
1) selecting a customized device name associated with a particular
user profile name for National Language Support or subsystem routing,
2) connecting PC and network printers as clients and 3) auto-signon
using clear-text or DES-encrypted password exchange.
Murphy, Rieth & Stevens [Page 1]
Internet Draft 5250 Telnet Enhancements February 1998
Applications may need to use system API's on the AS/400 in order to
extract Telnet session settings from the device name description.
Refer to the Retrieve Device Description (QDCRDEVD) API described in
the AS/400 System API book [3] on how to extract information using
the DEVD0600 and DEVD1100 templates.
This draft describes how the IBM 5250 Telnet server supports Work
Station Function (WSF) printers using 5250 Display Station Pass-
Through. A response code is returned by the Telnet server to
indicate success or failure of the WSF printer session.
Murphy, Rieth & Stevens [Page 2]
Internet Draft 5250 Telnet Enhancements February 1998
1. Table of Contents
CONTENTS
1. Table of Contents.................................. 3
2. Enhancing Telnet Negotiations...................... 4
3. Standard Telnet Option Negotiation................. 5
4. Enhanced Telnet Option Negotiation................. 7
5. Enhanced Display Emulation Support................. 10
6. Enhanced Display Auto-Signon and Password
Encryption......................................... 11
7. Device Name Collision Processing................... 15
8. Enhanced Printer Emulation Support................. 16
9. Telnet Printer Terminal Types...................... 18
10. Telnet Printer Startup Response Record for Printer
Emulators.......................................... 21
10.1 Example of a Success Response Record......... 22
10.2 Example of an Error Response Record.......... 23
10.3 Response Codes............................... 24
11. Printer Steady-State Pass-Through Interface........ 25
11.1 Example of a Print Record.................... 28
11.2 Example of a Print Complete Record........... 29
11.3 Example of a Null Print Record............... 30
12. End-to-End Print Example........................... 31
13. Author's Note...................................... 36
14. References......................................... 36
15. Security Considerations............................ 37
16. Author's Address................................... 37
17. Relation to Other RFC's............................ 38
LIST OF FIGURES
Figure 1. Example of a success status response
record....................................... 22
Figure 2. Example of an error response record.......... 23
Figure 3. Layout of the printer pass-through
header....................................... 25
Figure 4. Server sending client data with a print
record....................................... 28
Figure 5. Client sending server a print complete
record....................................... 29
Figure 6. Server sending client a null print
record....................................... 30
Murphy, Rieth & Stevens [Page 3]
Internet Draft 5250 Telnet Enhancements February 1998
2. Enhancing Telnet Negotiations
The 5250 Telnet server enables clients to negotiate both terminal and
printer device names through Telnet Environment Options Negotiations,
defined in the Standards Track RFC 1572 [13].
The purpose of RFC 1572 is to exchange environment information using
a set of standard or custom variables. By using a combination of
both standard VAR's and custom USERVAR's, the 5250 Telnet server
allows client Telnet to request a pre-defined specific device by
name.
If no pre-defined device exists then the device will be created, with
client Telnet having the option to negotiate device attributes, such
as the code page, character set, keyboard type, etc.
Since printers can now be negotiated as a device name, new terminal
types have been defined to request printers. For example, you can
now negotiate "IBM-3812-1" and "IBM-5553-B01" as valid TERMINAL-TYPE
options [11].
Finally, the 5250 Telnet server will allow exchange of user profile
and password information, where the password may be in either clear-
text or encrypted form. If a valid combination of profile and
password is received, then the client is allowed to bypass the sign-
on panel. The setting of the QRMTSIGN system value must be either
*VERIFY or *SAMEPRF for the bypass of the sign-on panel to succeed.
Murphy, Rieth & Stevens [Page 4]
Internet Draft 5250 Telnet Enhancements February 1998
3. Standard Telnet Option Negotiation
Telnet server option negotiation typically begins with the issuance,
by the server, of an invitation to engage in terminal type
negotiation with the Telnet client (DO TERMINAL-TYPE) [11]. The
client and server then enter into a series of sub-negotiations to
determine the level of terminal support that will be used. After the
terminal type is agreed upon, the client and server will normally
negotiate a required set of additional options (EOR [12], BINARY
[10], SGA [15]) that are required to support "transparent mode" or
full screen 5250/3270 block mode support. As soon as the required
options have been negotiated, the server will suspend further
negotiations, and begin with initializing the actual virtual device
on the AS/400. A typical exchange might start like the following:
AS/400 Telnet server Enhanced Telnet client
-------------------------- -------------------------
IAC DO TERMINAL-TYPE -->
<-- IAC WILL TERMINAL-TYPE
IAC SB TERMINAL-TYPE SEND
IAC SE -->
IAC SB TERMINAL-TYPE IS
<-- IBM-5555-C01 IAC SE
IAC DO EOR -->
<-- IAC WILL EOR
<-- IAC DO EOR
IAC WILL EOR -->
.
.
(other negotiations) .
Actual bytes transmitted in the above example are shown in hex below.
AS/400 Telnet server Enhanced Telnet client
-------------------------- -------------------------
FF FD 18 -->
<-- FF FB 18
FF FA 18 01 FF F0 -->
FF FA 18 00 49 42 4D 2D
35 35 35 35 2D 43 30 31
<-- FF F0
FF FD 19 -->
<-- FF FB 19
<-- FF FD 19
FF FB 19 -->
.
.
(other negotiations) .
Murphy, Rieth & Stevens [Page 5]
Internet Draft 5250 Telnet Enhancements February 1998
Some negotiations are symmetrical between client and server and some
are negotiated in one direction only. Also, it is permissible and
common practice to bundle more than one response or request, or
combine a request with a response, so the actual exchange may look
different in practice to what is shown above.
Murphy, Rieth & Stevens [Page 6]
Internet Draft 5250 Telnet Enhancements February 1998
4. Enhanced Telnet Option Negotiation
In order to accommodate the new environment option negotiations, the
server will bundle an environment option invitation along with the
standard terminal type invitation request to the client.
A client should either send a negative acknowledgment (WONT NEW-
ENVIRON), or at some point after completing terminal type
negotiations, but before completing the full set of negotiations
required for transparent mode, engage in environment option sub-
negotiation with the server. A maximum or 1024 bytes of environment
strings may be sent to the server. A recommended sequence might look
like the following:
AS/400 Telnet server Enhanced Telnet client
-------------------------- -------------------------
IAC DO NEW-ENVIRON
IAC DO TERMINAL-TYPE -->
(2 requests bundled)
<-- IAC WILL NEW-ENVIRON
IAC SB NEW-ENVIRON SEND
VAR IAC SE -->
IAC SB NEW-ENVIRON IS
VAR "USER" VALUE "JONES"
USERVAR "DEVNAME" VALUE "MYDEVICE07"
<-- IAC SE
<-- IAC WILL TERMINAL-TYPE
(do the terminal type
sequence first)
IAC SB TERMINAL-TYPE SEND
IAC SE -->
IAC SB TERMINAL-TYPE IS
<-- IBM-5555-C01 IAC SE
(terminal type negotiations
completed)
IAC DO EOR -->
(server will continue
with normal transparent
mode negotiations)
<-- IAC WILL EOR
.
.
(other negotiations) .
Actual bytes transmitted in the above example are shown in hex below.
Murphy, Rieth & Stevens [Page 7]
Internet Draft 5250 Telnet Enhancements February 1998
AS/400 Telnet server Enhanced Telnet client
-------------------------- -------------------------
FF FD 27
FF FD 18 -->
(2 requests bundled)
<-- FF FB 27
FF FA 27 01 00 FF F0 -->
FF FA 27 00 00 55 53 45
52 01 4A 4F 4E 45 53 03
44 45 56 4E 41 4D 45 01
4D 59 44 45 56 49 43 45
<-- 30 37 FF F0
<-- FF FB 18
(do the terminal type
sequence first)
FF FA 18 01 FF F0 -->
FF FA 18 00 49 42 4D 2D
35 35 35 35 2D 43 30 31
<-- FF F0
FF FD 19 -->
(server will continue
with normal transparent
mode negotiations)
<-- FF FB 19
.
.
(other negotiations) .
RFC 1572 defines 6 standard VAR's: USER, JOB, ACCT, PRINTER,
SYSTEMTYPE, and DISPLAY. The USER standard VAR will hold the value
of the AS/400 user profile name to be used in auto-signon requests.
The Telnet server will make no direct use of the additional 5 VAR's,
nor are any of them required to be sent. All standard VAR's and
their values that are received by the Telnet server will be placed in
a buffer, along with any USERVAR's received (described below), and
made available to a registered initialization exit program to be used
for any purpose desired.
There are some reasons you may want to send NEW-ENVIRON negotiations
prior to TERMINAL-TYPE negotiations. With AS/400 TELNET server,
several virtual device modes can be negotiated: 1) VTxxx device 2)
3270 device 3) 5250 device (includes Network Station). The virtual
device mode selected depends on the TERMINAL-TYPE negotiated plus any
other TELNET option negotiations necessary to support those modes.
The AS/400 TELNET server will create the desired virtual device at
the first opportunity it thinks it has all the requested attributes
needed to create the device. This can be as early as completion of
the TERMINAL-TYPE negotiations.
Murphy, Rieth & Stevens [Page 8]
Internet Draft 5250 Telnet Enhancements February 1998
For the case of Transparent mode (5250 device), then the moment
TERMINAL-TYPE, BINARY, and EOR options are negotiated the TELNET
server will go create the virtual device. Receiving any NEW-ENVIRON
negotiations after these option negotiations are complete will result
in the NEW-ENVIRON negotiations having no effect on device
attributes, as the virtual device will have already been created.
So, for Transparent mode, NEW-ENVIRON negotiations are effectively
closed once EOR is negotiated, since EOR is generally the last option
done.
For other devices modes (such as VTxxx or 3270), you cannot be sure
when the AS/400 TELNET server thinks it has all the attributes to
create the device. Recall that NEW-ENVIRON negotiations are
optional, and therefore the AS/400 TELNET server need not wait for
any NEW-ENVIRON options prior to creating the virtual device. It is
in the clients best interest to send NEW-ENVIRON negotiations as soon
as possible, preferably before TERMINAL-TYPE is negotiated. That
way, the client can be sure the requested attributes were received
before the virtual device is created.
Murphy, Rieth & Stevens [Page 9]
Internet Draft 5250 Telnet Enhancements February 1998
5. Enhanced Display Emulation Support
RFC 1572 style USERVAR variables have been defined to allow a
compliant Telnet client more control over the Telnet server virtual
device on the AS/400. These USERVAR's allow the client Telnet to
create or select a previously created virtual device. If the virtual
device does not exist and must be created, then the USERVAR variables
are used to create and initialize the device attributes. If the
virtual device already exists, the device attributes are modified.
The USERVAR's defined to accomplish this are:
USERVAR VALUE EXAMPLE DESCRIPTION
-------- ---------------- ---------------- -------------------
DEVNAME us-ascii char(x) MYDEVICE07 Display device name
KBDTYPE us-ascii char(3) USB Keyboard type
CODEPAGE us-ascii char(y) 437 Code page
CHARSET us-ascii char(y) 1212 Character set
x - up to a maximum of 10 characters
y - up to a maximum of 5 characters
For a description of the KBDTYPE, CODEPAGE and CHARSET parameters and
their permissible values, refer to Chapter 8 in the Communications
Configuration Reference [5] and also to Appendix C in National
Language Support [16].
Murphy, Rieth & Stevens [Page 10]
Internet Draft 5250 Telnet Enhancements February 1998
6. Enhanced Display Auto-Signon and Password Encryption
Several 5250 Telnet server specific USERVAR's will be defined. One
will carry a random seed to be used in Data Encryption Standard (DES)
password encryption, and another will carry the encrypted copy of the
password. This would use the same password/substitution scheme as
APPC and Client Access. For a description of the 7-step DES
encryption scheme, refer to Federal Information Processing Standards
Publication 46 [17] or visit the IBM Customer Support FTP Server at
one of the following links:
ftp://ftp.networking.ibm.com/pub/standards/ciw/sig/sec/pwsubciw.ps
ftp://ftp.networking.ibm.com/pub/standards/ciw/sig/sec/pwsubciw.ps.Z
ftp://ftp.networking.ibm.com/pub/standards/ciw/sig/sec/pwsubciw.zip
If encrypted password exchange is not required, clear-text password
exchange is permitted using the same USERVAR's defined for
encryption. For this case, the random client seed should be set to
either an empty value (RFC 1572 preferred method) or to hexadecimal
zeros to indicate the password is not encrypted, but is clear-text.
It should be noted that security of clear-text password exchange
cannot be guaranteed unless the network is physically protected or a
trusted network (such as an intranet). If your network is vulnerable
to IP address spoofing or directly connected to the Internet, you
should engage in encrypted password exchange to validate a clients
identity.
Additional VAR's and USERVAR's have also been defined to allow an
auto-signon user greater control over their startup environment,
similar to what is supported using the Open Virtual Terminal
(QTVOPNVT) API [3].
The standard VAR's supported to accomplish this are:
VAR VALUE EXAMPLE DESCRIPTION
-------- ---------------- ---------------- -------------------
USER us-ascii char(x) USERXYZ User profile name
x - up to a maximum of 10 characters
Murphy, Rieth & Stevens [Page 11]
Internet Draft 5250 Telnet Enhancements February 1998
The custom USERVAR's defined to accomplish this are:
USERVAR VALUE EXAMPLE DESCRIPTION
-------- ---------------- ---------------- -------------------
IBMRSEED binary(8) 8-byte hex field Random client seed
IBMSUBSPW binary(10) 10-byte hex field Substitute password
IBMCURLIB us-ascii char(x) QGPL Current library
IBMIMENU us-ascii char(x) MAIN Initial menu
IBMPROGRAM us-ascii char(x) QCMD Program to call
x - up to a maximum of 10 characters
In order to communicate the server random seed value to the client,
the server will request a USERVAR name made up of a fixed part (the 8
characters "IBMRSEED" immediately followed by an 8-byte hexadecimal
variable part, which is the server random seed. The client generates
its own 8-byte random seed value, and uses both seeds to encrypt the
password. Both the encrypted password and the client random seed
value are then sent to the server for authentication. RFC 1572 rules
will need to be adhered to when transmitting the client random seed
and substituted password values to the server. Specifically, since a
typical environment string is a variable length hexadecimal field,
the hexadecimal fields are required to be escaped and/or byte stuffed
according to the RFC 854 [8], where any single byte could be mis-
construed as a Telnet IAC or other Telnet option negotiation control
character. The client must escape and/or byte stuff any bytes which
could be seen as a RFC 1572 [13] option, specifically VAR, VALUE, ESC
and USERVAR.
The following illustrates the encrypted case:
AS/400 Telnet server Enhanced Telnet client
-------------------------- -------------------------------
IAC DO NEW-ENVIRON -->
<-- IAC WILL NEW-ENVIRON
IAC SB NEW-ENVIRON SEND
USERVAR "IBMRSEEDxxxxxxxx"
USERVAR "IBMSUBSPW"
VAR USERVAR IAC SE -->
IAC SB NEW-ENVIRON IS
VAR "USER" VALUE "SMITH"
USERVAR "IBMRSEED" VALUE "yyyyyyyy"
USERVAR "IBMSUBSPW" VALUE "zzzzzzzz"
<-- IAC SE
.
.
(other negotiations) .
Murphy, Rieth & Stevens [Page 12]
Internet Draft 5250 Telnet Enhancements February 1998
In this example, "xxxxxxxx" is an 8-byte hexadecimal random server
seed, "yyyyyyyy" is an 8-byte hexadecimal random client seed and
"zzzzzzzz" is an 8-byte hexadecimal encrypted password. If the
password is not valid, then the sign-on panel is displayed. If the
password is expired, then the Change Password panel is displayed.
Actual bytes transmitted in the above example are shown in hex below.
AS/400 Telnet server Enhanced Telnet client
-------------------------- -------------------------
FF FD 27 -->
<-- FF FB 27
FF FA 27 01 03 49 42 4D
52 53 45 45 44 78 78 78
78 78 78 78 78 03 49 42
4D 53 55 42 53 50 57 03
00 FF F0 -->
FF FA 27 00 00 55 53 45
52 01 53 4D 49 54 48 03
49 42 4D 52 53 45 45 44
01 79 79 79 79 79 79 79
79 03 49 42 4D 53 55 42
53 50 57 01 7A 7A 7A 7A
<-- 7A 7A 7A 7A FF F0
The following illustrates the clear-text case:
AS/400 Telnet server Enhanced Telnet client
-------------------------- -------------------------
IAC DO NEW-ENVIRON -->
<-- IAC WILL NEW-ENVIRON
IAC SB NEW-ENVIRON SEND
USERVAR "IBMRSEEDxxxxxxxx"
USERVAR "IBMSUBSPW"
VAR USERVAR IAC SE -->
IAC SB NEW-ENVIRON IS
VAR "USER" VALUE "SMITH"
USERVAR "IBMRSEED" VALUE
USERVAR "IBMSUBSPW" VALUE "yyyyyyyy"
<-- IAC SE
.
.
(other negotiations) .
In this example, "xxxxxxxx" is an 8-byte hexadecimal random server
seed, "yyyyyyyyyy" is a 10-byte us-ascii client clear-text password.
If the password has expired, then the sign-on panel is displayed.
Murphy, Rieth & Stevens [Page 13]
Internet Draft 5250 Telnet Enhancements February 1998
Actual bytes transmitted in the above example are shown in hex below.
AS/400 Telnet server Enhanced Telnet client
-------------------------- -------------------------
FF FD 27 -->
<-- FF FB 27
FF FA 27 01 03 49 42 4D
52 53 45 45 44 78 78 78
78 78 78 78 78 03 49 42
4D 53 55 42 53 50 57 03
00 FF F0 -->
FF FA 27 00 00 55 53 45
52 03 53 4D 49 54 48 03
49 42 4D 52 53 45 45 44
01 03 49 42 4D 53 55 42
53 50 57 01 7A 7A 7A 7A
<-- 7A 7A 7A 7A FF F0
Murphy, Rieth & Stevens [Page 14]
Internet Draft 5250 Telnet Enhancements February 1998
7. Device Name Collision Processing
Device name collision occurs when a Telnet client sends the Telnet
server a virtual device name that it wants to use, but that device is
already in use on the server. When this occurs, the Telnet server
sends a request to the client asking it to try another device name.
The environment option negotiation uses the USERVAR name of DEVNAME
to communicate the virtual device name. The following shows how the
Telnet server will request the Telnet client to send a different
DEVNAME when device name collision occurs.
AS/400 Telnet server Enhanced Telnet client
-------------------------- -------------------------
IAC SB NEW-ENVIRON SEND
VAR USERVAR IAC SE -->
Server requests all environment variables be sent.
IAC SB NEW-ENVIRON IS USERVAR
"DEVNAME" VALUE "MYDEVICE1"
USERVAR "xxxxx" VALUE "xxx"
...
<-- IAC SE
Client sends all environment variables, including DEVNAME. Server
tries to select device MYDEVICE1. If the device is already in use,
server requests DEVNAME be sent again.
IAC SB NEW-ENVIRON SEND
USERVAR "DEVNAME" IAC SE -->
Server sends a request for a single environment variable: DEVNAME
IAC SB NEW-ENVIRON IS USERVAR
<-- "DEVNAME" VALUE "MYDEVICE2" IAC SE
Client sends one environment variable, calculating a new value of
MYDEVICE2. If MYDEVICE2 is different from the last request, then
server tries to select device MYDEVICE2, else server disconnects
client. If MYDEVICE2 is also in use, server will send DEVNAME request
again, and keep doing so until it receives a device that is not in
use, or the same device name twice in row.
Murphy, Rieth & Stevens [Page 15]
Internet Draft 5250 Telnet Enhancements February 1998
8. Enhanced Printer Emulation Support
RFC 1572 style USERVAR variables have been defined to allow a
compliant Telnet client more control over the Telnet server virtual
device on the AS/400. These USERVAR's allow the client Telnet to
select a previously created virtual device or auto-create a new
virtual device with requested attributes.
This makes the enhancements available to any Telnet client that
chooses to support the new negotiations.
The USERVAR's defined to accomplish this are:
USERVAR VALUE EXAMPLE DESCRIPTION
------------- ---------------- ---------------- -------------------
DEVNAME us-ascii char(x) PRINTER1 Printer device name
IBMIGCFEAT us-ascii char(6) 2424J0 IGC feature (DBCS)
IBMMSGQNAME us-ascii char(x) QSYSOPR *MSGQ name
IBMMSGQLIB us-ascii char(x) QSYS *MSGQ library
IBMFONT us-ascii char(x) 12 Font
IBMFORMFEED us-ascii char(1) C | U | A Formfeed
IBMBUFFERSIZE us-ascii char(y) 4096 Reserved
IBMTRANSFORM us-ascii char(1) 1 | 0 Transform
IBMMFRTYPMDL us-ascii char(x) *IBM42023 Mfg. type and model
IBMPPRSRC1 binary(1) 1-byte hex field Paper source 1
IBMPPRSRC2 binary(1) 1-byte hex field Paper source 2
IBMENVELOPE binary(1) 1-byte hex field Envelope
IBMASCII899 us-ascii char(1) 1 | 0 ASCII 899 support
IBMWSCSTNAME us-ascii char(x) *NONE WCS name
IBMWSCSTLIB us-ascii char(x) *LIBL WCS library
IBMIGCFEAT us-ascii char(6) 2424J0 IGC feature (DBCS)
x - up to a maximum of 10 characters
y - up to a maximum of 5 characters
The "IBM" prefix on the USERVAR's denotes AS/400 specific attributes.
For a description of most of these parameters (drop the "IBM" from
the USERVAR) and their permissible values, refer to Chapter 8 in the
Communications Configuration Reference [5].
Murphy, Rieth & Stevens [Page 16]
Internet Draft 5250 Telnet Enhancements February 1998
The IBMPPRSRC1, IBMPPRSRC2 and IBMENVELOPE custom USERVAR's do not
map directly to their descriptions in Chapter 8 in the Communications
Configuration Reference [5]. To map these, use the index listed
here:
IBMPPRSRC1 HEX IBMPPRSRC2 HEX IBMENVELOPE HEX
---------- ----- ---------- ----- ----------- -----
*NONE 'FF'X *NONE 'FF'X *NONE 'FF'X
*MFRTYPMDL 'FE'X *MFRTYPMDL 'FE'X *MFRTYPMDL 'FE'X
*SAME '00'X *SAME '00'X *SAME '00'X
*LETTER '01'X *LETTER '01'X *B5 '06'X
*LEGAL '02'X *LEGAL '02'X *MONARCH '09'X
*EXECUTIVE '03'X *EXECUTIVE '03'X *NUMBER9 '0A'X
*A4 '04'X *A4 '04'X *NUMBER10 '0B'X
*A5 '05'X *A5 '05'X *C5 '0C'X
*B5 '06'X *B5 '06'X *DL '0D'X
*CONT80 '07'X *CONT80 '07'X
*CONT132 '08'X *CONT132 '08'X
*A3 '0E'X *A3 '0E'X
*B4 '0F'X *B4 '0F'X
*LEDGER '10'X *LEDGER '10'X
Note 1: For IBMPPRSRC2, *CONT80 and *CONT132 support starts at V3R7.
Note 2: For IBMPPRSRC1 and IBMPPRSRC2, *A3, *B4 and *LEDGER support
starts at V3R7.
Murphy, Rieth & Stevens [Page 17]
Internet Draft 5250 Telnet Enhancements February 1998
9. Telnet Printer Terminal Types
New Telnet options are defined for the printer pass-through mode of
operation. To enable printer pass-through mode, both the client and
server must agree to at least support the Transmit-Binary, End-Of-
Record, and Terminal-Type Telnet options. The following are new
terminal types for printers:
TERMINAL-TYPE DESCRIPTION
------------- -------------------
IBM-5553-B01 Double-Byte printer
IBM-3812-1 Single-Byte printer
Specific characteristics of the IBM-5553-B01 or IBM-3812-1 printers
are specified through the USERVAR IBMMFRTYPMDL, which specifies the
manufacturer type and model.
An example of a typical negotiation process to establish printer
pass-through mode of operation is shown below. In this example, the
server initiates the negotiation by sending the DO TERMINAL-TYPE
request.
Murphy, Rieth & Stevens [Page 18]
Internet Draft 5250 Telnet Enhancements February 1998
AS/400 Telnet server Enhanced Telnet client
-------------------------- --------------------------
IAC DO NEW-ENVIRON -->
<-- IAC WILL NEW-ENVIRON
IAC SB NEW-ENVIRON SEND
VAR USERVAR IAC SE -->
IAC SB NEW-ENVIRON IS
USERVAR "DEVNAME" VALUE "PCPRINTER"
USERVAR "IBMMSGQNAME" VALUE "QSYSOPR"
USERVAR "IBMMSGQLIB" VALUE "*LIBL"
USERVAR "IBMTRANSFORM" VALUE "0"
USERVAR "IBMFONT" VALUE "12"
USERVAR "IBMFORMFEED" VALUE "C"
USERVAR "IBMBUFFERSIZE" VALUE "1024"
USERVAR "IBMPPRSRC1" VALUE ESC '01'X
USERVAR "IBMPPRSRC2" VALUE '04'X
USERVAR "IBMENVELOPE" VALUE IAC 'FF'X
<-- IAC SE
IAC DO TERMINAL-TYPE -->
<-- IAC WILL TERMINAL-TYPE
IAC SB TERMINAL-TYPE SEND
IAC SE -->
IAC SB TERMINAL-TYPE IS IBM-3812-1
<-- IAC SE
IAC DO BINARY -->
<-- IAC WILL BINARY
IAC DO EOR -->
<-- IAC WILL EOR
Some points about the above example. The IBMPPRSRC1 value requires
escaping the value using ESC according to RFC 1572 [13]. The
IBMPPRSRC2 does not require an ESC character since '04'X has no
conflict with RFC 1572 options. Finally, to send 'FF'X for the
IBMENVELOPE value, escape the 'FF'X value by using another 'FF'X
(called "doubling"), so as not to have the value interpreted as a
Telnet character per RFC 854 [8].
Actual bytes transmitted in the above example are shown in hex below.
Murphy, Rieth & Stevens [Page 19]
Internet Draft 5250 Telnet Enhancements February 1998
AS/400 Telnet server Enhanced Telnet client
-------------------------- --------------------------
FF FD 27 -->
<-- FF FB 27
FF FA 27 01 00 03 FF F0 -->
FF FA 27 00 03 44 45 56
4E 41 4D 45 01 50 43 50
52 49 4E 54 45 52 03 49
42 4D 4D 53 47 51 4E 41
4D 45 01 51 53 59 53 4F
50 52 03 49 42 4D 4D 53
47 51 4C 49 42 01 2A 4C
49 42 4C 03 49 42 4D 54
52 41 4E 53 46 4F 52 4D
01 30 03 49 42 4D 46 4F
4E 54 01 31 32 03 49 42
4D 46 4F 52 4D 46 45 45
44 01 43 03 49 42 4D 42
55 46 46 45 52 53 49 5A
45 01 31 30 32 34 03 49
42 4D 50 50 52 53 52 43
31 01 02 01 03 49 42 4D
50 50 52 53 52 43 32 01
04 03 49 42 4D 45 4E 56
45 4C 4F 50 45 01 FF FF
<-- FF F0
FF FD 18 -->
<-- FF FB 18
FF FA 18 01 FF F0 -->
FF FA 18 00 49 42 4D 2D
<-- 33 38 31 32 2D 31 FF F0
FF FD 00 -->
<-- FF FB 00
FF FD 19 -->
FF FB 19
Murphy, Rieth & Stevens [Page 20]
Internet Draft 5250 Telnet Enhancements February 1998
10. Telnet Printer Startup Response Record for Printer Emulators
Once Telnet negotiation for a 5250 pass-through mode is completed,
the 5250 Telnet server will initiate a virtual printer power-on
sequence on behalf of the Telnet client. The Telnet server will
supply a Startup Response Record to the Telnet client with the status
of the printer power-on sequence, indicating success or failure of
the virtual printer power-on sequence.
This section shows an example of two Startup Response Records. The
source device is a type 3812 model 01 printer with name "PCPRINTER"
on the target system "TARGET".
Figure 1 shows an example of a successful response; Figure 2 shows an
example of an error response.
Murphy, Rieth & Stevens [Page 21]
Internet Draft 5250 Telnet Enhancements February 1998
10.1 Example of a Success Response Record
The response record in Figure 1 was sent by an AS/400 at Release
V4R2. It is an example of the target sending back a successful
Startup Response Record.
+--------------------------------------------------------------------+
| +----- Pass-Through header |
| | +--- Response data |
| | | +---- Start diagnostic information |
| | | | |
| +----------++----------++--------------------------------------- |
| | || || |
| 004912A090000560060020C0003D0000C9F9F0F2E3C1D9C7C5E34040D7C3D7D9 |
| | | T A R G E T P C P R |
| +------+ |
| Response Code (I902) |
| |
| ---------------------------------------------------------------- |
| |
| C9D5E3C5D9400000000000000000000000000000000000000000000000000000 |
| I N T E R |
| |
| +------- End of diagnostic information |
| | |
| -----------------+ |
| | |
| 000000000000000000 |
+--------------------------------------------------------------------+
Figure 1. Example of a success response record.
- '0049'X = Length pass-through data, including this length field
- '12A0'X = GDS LU6.2 header
- '90000560060020C0003D0000'X = Fixed value fields
- 'C9F9F0F2'X = Response Code (I902)
- 'E3C1D9C7C5E34040'X = System Name (TARGET)
- 'D7C3D7D9C9D5E3C5D940'X = Object Name (PCPRINTER)
Murphy, Rieth & Stevens [Page 22]
Internet Draft 5250 Telnet Enhancements February 1998
10.2 Example of an Error Response Record
The response record in Figure 2 is one that reports an error. The
virtual device named "PCPRINTER", is not available on the target
system "TARGET", because the device is not available. You would
normally see this error if the printer was already assigned to
another Telnet session.
+--------------------------------------------------------------------+
| +----- Pass-Through header |
| | +--- Response data |
| | | +---- Start diagnostic information |
| | | | |
| +----------++----------++--------------------------------------- |
| | || || |
| 004912A09000056006008200003D0000F8F9F0F2E3C1D9C7C5E34040D7C3D7D9 |
| | | T A R G E T P C P R |
| +------+ |
| Response Code (8902) |
| |
| ---------------------------------------------------------------- |
| |
| C9D5E3C5D9400000000000000000000000000000000000000000000000000000 |
| I N T E R |
| |
| +------- End of diagnostic information |
| | |
| -----------------+ |
| | |
| 000000000000000000 |
+--------------------------------------------------------------------+
Figure 2. Example of an error response record.
- '0049'X = Length pass-through data, including this length field
- '12A0'X = GDS LU6.2 header
- '90000560060020C0003D0000'X = Fixed value fields
- 'F8F9F0F2'X = Response Code (8902)
- 'E3C1D9C7C5E34040'X = System Name (TARGET)
- 'D7C3D7D9C9D5E3C5D940'X = Object Name (PCPRINTER)
Murphy, Rieth & Stevens [Page 23]
Internet Draft 5250 Telnet Enhancements February 1998
10.3 Response Codes
The Start-Up Response Record success response codes:
CODE DESCRIPTION
---- ------------------------------------------------------
I901 Virtual device has less function than source device
I902 Session successfully started
I906 Automatic sign-on requested, but not allowed.
Session still allowed; a sign-on screen will be
coming.
The Start-Up Response Record error response codes:
CODE DESCRIPTION
---- ------------------------------------------------------
2702 Device description not found.
2703 Controller description not found.
2777 Damaged device description.
8901 Device not varied on.
8902 Device not available.
8903 Device not valid for session.
8906 Session initiation failed.
8907 Session failure.
8910 Controller not valid for session.
8916 No matching device found.
8917 Not authorized to object.
8918 Job canceled.
8920 Object partially damaged.
8921 Communications error.
8922 Negative response received.
8923 Start-up record built incorrectly.
8925 Creation of device failed.
8928 Change of device failed.
8929 Vary on or vary off failed.
8930 Message queue does not exist.
8934 Start-up for S/36 WSF received.
8935 Session rejected.
8936 Security failure on session attempt.
8937 Automatic sign-on rejected.
8940 Automatic configuration failed or not allowed.
I904 Source system at incompatible release.
Murphy, Rieth & Stevens [Page 24]
Internet Draft 5250 Telnet Enhancements February 1998
11. Printer Steady-State Pass-Through Interface
The information in this section applies to the passthrough session
after the receipt of startup confirmation records is complete.
Following is the printer header interface used by Telnet.
+--------------------------------------------------------------------+
| +-- Length of structure (LLLL) |
| | |
| | +-- GDS identifier |
| | | |
| | | +-- Data flow record |
| | | | |
| | | | +-- Length of pass-through specific header (LL) |
| | | | | |
| | | | | +-- Flags |
| | | | | | |
| | | | | | +-- Printer operation code |
| | | | | | | |
| | | | | | | +-- Diagnostic field - zero pad to |
| | | | | | | | LL specified |
| | | | | | | | |
| | | | | | | | +-- Printer data |
| | | | | | | | | |
| +--+ +--+ +--+ ++ +--+ ++ +----------+ +----------------+ |
| | | | | | | || | | || | | | | |
| xxxx 12A0 xxxx xx xxxx xx xxxxxxxxxxxx ... print data ... |
| |
+--------------------------------------------------------------------+
Figure 3. Layout of the printer pass-through header
BYTES 0-1: Length of structure including this field (LLLL)
BYTES 2-3: GDS Identifier ('12A0'X)
Murphy, Rieth & Stevens [Page 25]
Internet Draft 5250 Telnet Enhancements February 1998
BYTE 4-5: Data flow record
This field contains flags that describe what type of data
pass-through should expect to find following this header.
Generally, bits 0-2 in the first byte are mutually exclusive
(that is, if one of them is set to '1'B, the rest will
be set to '0'B.) The bits, and their meanings follow.
BIT DESCRIPTION
0 Start-Up confirmation
1 Termination record
2 Start-Up Record
3 Diagnostic information included
4 - 5 Reserved
6 Reserved
7 Printer record
8 - 13 Reserved
14 Client-originated (inbound) printer record
15 Server-originated (outbound) printer record
BYTE 6: Length printer pass-through header including this field (LL)
BYTES 7-8: Flags
BYTE 7 BITS: xxxx x111 --> Reserved
xxxx 1xxx --> Last of chain
xxx1 xxxx --> First of chain
xx1x xxxx --> Printer now ready
x1xx xxxx --> Intervention Required
1xxx xxxx --> Error Indicator
BYTE 8 BITS: xxxx xxxx --> Reserved
BYTE 9: Printer operation code
'01'X Print/Print complete
'02'X Clear Print Buffers
Murphy, Rieth & Stevens [Page 26]
Internet Draft 5250 Telnet Enhancements February 1998
BYTE 10-LL: Diagnostic information (1)
If BYTE 7 = x1xx xxxx then bytes 10-LL may contain: (2)
Printer not ready C9 00 03 02 51 00
End of forms C9 00 03 02 50 00
Graphic check C9 00 03 02 26 00
Data stream exception C9 00 03 02 66 00
Data stream exception C9 00 03 02 67 00
Data stream exception C9 00 03 02 68 00
Data stream exception C9 00 03 02 69 00
If BYTE 7 = 1xxx xxxx then bytes 10-LL may contain: (3)
Cancel 08 11 02 00 00 00
Invalid print parameter 08 11 02 29 00 00
Invalid print command 08 11 02 28 00 00
Figure notes:
1. LL is the length of the structure defined in Byte 6. If
no additional data is present, the remainder of the
structure must be padded with zeroes.
2. These are printer signal commands. Further information on
these commands may be obtained from the 5494 Remote
Control Unit Functions Reference guide [2]. Refer to your
printer documentation for more specific information on
these data stream exceptions.
3. These are printer negative responses. Further information
on these commands may be obtained from the 5494 Remote
Control Unit Functions Reference guide [2].
The print data will start in byte LL+1.
Murphy, Rieth & Stevens [Page 27]
Internet Draft 5250 Telnet Enhancements February 1998
11.1 Example of a Print Record
Figure 4 shows the server sending the client data with a print
record. This is normally seen following receipt of a Success
Response Record, such as the example in Figure 1.
+--------------------------------------------------------------------+
| +-- Length of structure (LLLL) |
| | +-- GDS identifier |
| | | +-- Data flow record |
| | | | +-- Length of pass-through specific header (LL) |
| | | | | +-- Flags |
| | | | | | +-- Printer operation code |
| | | | | | | +-- Zero pad to LL specified (0A) |
| | | | | | | | +-- Printer data |
| | | | | | | | | |
| +--+ +--+ +--+ ++ +--+ ++ +----------+ +---------------------------|
| | | | | | | || | | || | | | |
| 0085 12A0 0101 0A 1800 01 000000000000 34C4012BD20345FF2BD2044C0002|
| |
| ------------------------------------------------------------ |
| |
| 2BD2040D00002BD20A8501010201030204022BD20309022BD2061100014A |
| |
| ------------------------------------------------------------ |
| |
| 402BD20601010000012BD306F60000FFFF2BD20A48000001000000010100 |
| |
| ------------------------------------------------------------ |
| |
| 2BD10705000B0090012BD2044900F02BD206404A403DE02BD2041500F034 |
| |
| end of printer data |
| -------------------------+ |
| | |
| C4012BD10381FF002BC8034001 |
+--------------------------------------------------------------------+
Figure 4. Server sending client data with a print record
- '0085'X = Logical record length, including this byte (LLLL)
- '12A0'X = GDS LU6.2 header
- '0101'X = Data flow record (server to client)
- '0A'X = Length of pass-through specific header (LL)
- '1800'X = First of chain / Last of chain indicators
- '01'X = Print
- '000000000000'X = Zero pad header to LL specified
- '34C401'X = First piece of data for spooled data
- Remainder is printer data/commands/orders
Murphy, Rieth & Stevens [Page 28]
Internet Draft 5250 Telnet Enhancements February 1998
11.2 Example of a Print Complete Record
Figure 5 shows the client sending the server a print complete record.
This would normally follow receipt of a print record, such as the
example in Figure 4. This indicates successful completion of a print
request.
+--------------------------------------------------------------------+
| +-- Length of structure (LLLL) |
| | +-- GDS identifier |
| | | +-- Data flow record |
| | | | +-- Length of pass-through specific header (LL) |
| | | | | +-- Flags |
| | | | | | +-- Printer operation code |
| | | | | | | |
| +--+ +--+ +--+ ++ +--+ ++ |
| | | | | | | || | | || |
| 000A 12A0 0102 04 0000 01 |
+--------------------------------------------------------------------+
Figure 5. Client sending server a print complete record
- '000A'X = Logical record length, including this byte (LLLL)
- '12A0'X = GDS LU6.2 header
- '0102'X = Data flow response record (client to server)
- '04'X = Length of pass-through specific header (LL)
- '0000'X = Good Response
- '01'X = Print Complete
Murphy, Rieth & Stevens [Page 29]
Internet Draft 5250 Telnet Enhancements February 1998
11.3 Example of a Null Print Record
Figure 6 shows the server sending the client a null print record.
The null print record is the last print command the server sends to
the client for a print job, and indicates to the printer there is no
more data.
This example would normally follow any number of print records, such
as the example in Figure 4. This indicates successful completion of
a print job. The client normally responds to this null print record
with another print complete record, such as in Figure 5.
+--------------------------------------------------------------------+
| +-- Length of structure (LLLL) |
| | +-- GDS identifier |
| | | +-- Data flow record |
| | | | +-- Length of pass-through specific header (LL) |
| | | | | +-- Flags |
| | | | | | +-- Printer operation code |
| | | | | | | +-- Zero pad to LL specified (0A) |
| | | | | | | | +-- Printer data |
| | | | | | | | | |
| +--+ +--+ +--+ ++ +--+ ++ +----------+ ++ |
| | | | | | | || | | || | | || |
| 0011 12A0 0101 0A 0800 01 000000000000 00 |
+--------------------------------------------------------------------+
Figure 6. Server sending client a null print record
- '0011'X = Logical record length, including this byte
- '12A0'X = GDS LU6.2 header
- '0101'X = Data flow record
- '0A'X = Length of pass-through specific header (LL)
- '0800'X = Last of Chain
- '01'X = Print
- '000000000000'X = Zero pad header to LL specified
- '00'X = Null data byte
Murphy, Rieth & Stevens [Page 30]
Internet Draft 5250 Telnet Enhancements February 1998
12. End-to-End Print Example
The next example shows a full print exchange between a Telnet client
and server for a 526 byte spooled file. Selective translation of the
hexadecimal streams into 1) Telnet negotiations and 2) ASCII/EBCDIC
characters are done to aid readability. Telnet negotiations are
delimited by '(' and ')' parenthesis characters; ASCII/EBCDIC
conversions are bracketed by '|' vertical bar characters.
AS/400 Telnet server Enhanced Telnet client
--------------------------------- ---------------------------------
FFFD27 -->
(IAC DO NEW-ENVIRON)
<-- FFFB27
(IAC WILL NEW-ENVIRON)
FFFD18FFFA270103 49424D5253454544
7CF9630A63D18004 0003FFF0 -->
(IAC DO TERMINAL-TYPE
IAC SB NEW-ENVIRON SEND USERVAR
IBMRSEED xxxxxxxx VAR USERVAR
IAC SE)
FFFB18FFFA270003 49424D5253454544
7CF9630A63D18004 00034445564E414D
450144554D4D5950 52540349424D4D53
47514E414D450151 5359534F50520349
424D4D5347514C49 42012A4C49424C03
49424D464F4E5401 3031310349424D46
4F524D4645454401 0349424D42554646
455253495A450137 36380349424D5452
<-- 414E53464F524D01 30FFF0
(IAC WILL TERMINAL-TYPE IAC SB
NEW-ENVIRON IS USERVAR
IBMRSEED xxxxxxxx VAR
USERVAR DEVNAME VALUE DUMMYPRT
USERVAR IBMMSGQNAME VALUE
USERVAR IBMMSGQLIB VALUE *LIBL
USERVAR IBMFONT VALUE 011
USERVAR IBMFORMFEED VALUE
USERVAR IBMBUFFERSIZE VALUE 768
USERVAR IBMTRANSFORM VALUE 0
IAC SE)
Murphy, Rieth & Stevens [Page 31]
Internet Draft 5250 Telnet Enhancements February 1998
FFFA1801FFF0 -->
(IAC DO SB TERMINAL-TYPE SEND
IAC SE)
<-- FFFA180049424D2D 333831322D31FFF0
(IAC SB TERMINAL-TYPE IS
IBM-3812-1 IAC SE)
FFFD19 -->
(IAC DO EOR)
<-- FFFB19
(IAC WILL EOR)
FFFB19FFFD00FFFB 00 -->
(IAC WILL EOR IAC DO BINARY
IAC WILL BINARY)
<-- FFFD19FFFB00FFFD 00
(IAC DO EOR IAC WILL BINARY
IAC DO BINARY)
FFFD00 -->
(IAC DO BINARY)
FFFB00004912A090 000560060020C000 |..........-...{.|
3D0000C9F9F0F2C1 E2F4F0F040404044 |...I902AS400 D| (EBCDIC)
554D4D5950525440 4000000000000000 |UMMYPRT |
0000000000000000 0000000000000000 |................|
0000000000000000 00000000FFEF --> |.............. |
(IAC WILL BINARY ... 73-byte
startup success response
record ... IAC EOR)
Murphy, Rieth & Stevens [Page 32]
Internet Draft 5250 Telnet Enhancements February 1998
007812A001010A18 0001000000000000 |.x..............|
036611180D12141B 461B481B4F1B541B |.f......F.H.O.T.| (ASCII)
55001B57001B3500 1B5F001B2D001B36 |U..W..5.._..-..6|
1B49021B461B481B 2D001B410C1B321B |.I..F.H.-..A..2.|
57001B461B49121B 57001B461B49121B |W..F.I..W..F.I..|
461B481B2D001B41 0C1B321B57001B46 |F.H.-..A..2.W..F|
1B49121B57001B46 1B49121B57001B46 |.I..W..F.I..W..F|
1B49121B410C1B32 FFEF --> |.I..A..2.. |
(... 120-byte print record ...
... first of chain ...
... last of chain ... IAC EOR)
<-- 000A12A001020400 0001FFEF
(10-byte print complete header)
008B12A001010A18 0001000000000000 |................|
03241B57001B461B 49121B410C1B321B |.$.W..F.I..A..2.| (ASCII)
43421B410C1B321B 410C1B320A0A0A0A |CB.A..2.A..2....|
0A1B410C1B320350 2020202020202020 |..A..2.P |
2020202020202020 2020202020202050 | P|
72696E74204B6579 204F757470757420 |rint Key Output |
2020202020202020 2020202020202020 | |
2020202020202020 2020202020202050 | P|
616765202020310D 03010DFFEF --> |age 1...... |
(... 139-byte print record ...
... first of chain ...
... last of chain ... IAC EOR)
<-- 000A12A001020400 0001FFEF
(10-byte print complete header)
031012A001010A10 0001000000000000 |................|
03010C03241B5700 1B461B49121B410C |....$.W..F.I..A.| (ASCII)
1B321B43421B410C 1B321B410C1B320A |.2.CB.A..2.A..2.|
0A0A0A0A1B410C1B 3203502020202020 |.....A..2.P |
2020202020202020 2020202020202020 | |
20205072696E7420 4B6579204F757470 | Print Key Outp|
7574202020202020 2020202020202020 |ut |
2020202020202020 2020202020202020 | |
2020506167652020 20310D03010D03FF | Page 1......|
FF0A202020203537 3639535331205634 |.. 5769SS1 V4|
52324D3020393830 3232382020202020 |R2M0 980228 |
2020202020202020 2020204153343030 | AS400|
2020202020202020 2020202020202030 | 0|
Murphy, Rieth & Stevens [Page 33]
Internet Draft 5250 Telnet Enhancements February 1998
342F32392F393820 2031363A30393A30 |4/29/98 16:09:0|
340D0A0D0A202020 20446973706C6179 |4.... Display|
2044657669636520 202E202E202E202E | Device . . . .|
202E203A20205150 4144455630303130 | . : QPADEV0010|
0D0A202020205573 657220202E202E20 |.. User . . |
2E202E202E202E20 2E202E202E202E20 |. . . . . . . . |
3A202044554D4D59 5553520D0A0D0A20 |: DUMMYUSR.... |
2020202020202020 2020202020202020 | |
2020202020202020 2020202020202020 | |
436F6D6D616E6420 456E747279202020 |Command Entry |
2020202020202020 2020202020202020 | |
2020202020204153 3430300D0A202020 | AS400.. |
03FFFF2020202020 2020202020202020 |... |
2020202020202020 2020202020202020 | |
2020202020202020 2020202020202020 | |
310D0A2050726576 696F757320636F6D |1.. Previous com|
6D616E647320616E 64206D6573736167 |mands and messag|
65733A0D0A0D0A20 2020284E6F207072 |es:.... (No pr|
6576696F75732063 6F6D6D616E647320 |evious commands |
6F72206D65737361 676573290D0A0D0A |or messages)....|
0D0A0D0A0D0A0D0A 0D0A0D0A0D0A0D0A |................|
0D0A202020202020 2020202020202020 |.. |
2020202020202020 2020202020202020 | |
2020202020202020 2020202020202020 | |
2020202020202020 2020202020202020 | |
2020202020202020 202020426F74746F | Botto|
6D0D0A20547903D6 706520636F6D6D61 |m.. Ty..pe comma|
6E642C2070726573 7320456E7465722E |nd, press Enter.|
0D0A203D3D3D3E20 53616D706C652050 |.. ===> Sample P|
72696E7420536372 65656E2E2E2E0D0A |rint Screen.....|
0D0A0D0A0D0A2046 333D457869742020 |...... F3=Exit |
2046343D50726F6D 707420202046393D | F4=Prompt F9=|
5265747269657665 2020204631303D49 |Retrieve F10=I|
6E636C7564652064 657461696C656420 |nclude detailed |
6D6573736167FFEF --> |messag.. |
(... 784-byte print record ...
... first of chain ... IAC EOR)
<-- 000A12A001020400 0001FFEF
(10-byte print complete header)
Murphy, Rieth & Stevens [Page 34]
Internet Draft 5250 Telnet Enhancements February 1998
006812A001010A00 0001000000000000 |.h..............|
65730D0A20463131 3D446973706C6179 |es.. F11=Display| (ASCII)
2066756C6C202020 2020204631323D43 | full F12=C|
616E63656C202020 204631333D496E66 |ancel F13=Inf|
6F726D6174696F6E 2041737369737461 |ormation Assista|
6E74202020463234 3D4D6F7265206B65 |nt F24=More ke|
79730D0A0D0A0D0C FFEF --> |ys........ |
(... 104-byte print record ...
IAC EOR)
<-- 000A12A001020400 0001FFEF
(10-byte print complete header)
002912A001010A00 0001000000000000 |.)..............|
03171B461B481B4F 1B541B55001B5700 |...F.H.O.T.U..W.| (ASCII)
1B35001B5F001B2D 00FFEF --> |.5.._..-... |
(... 41-byte print record ...
IAC EOR)
<-- 000A12A001020400 0001FFEF
(10-byte print complete header)
001112A001010A08 0001000000000000
00FFEF -->
(... 17-byte NULL print record ...
... last of chain ... IAC EOR)
<-- 000A12A001020400 0001FFEF
(10-byte print complete header)
Murphy, Rieth & Stevens [Page 35]
Internet Draft 5250 Telnet Enhancements February 1998
13. Author's Note
Discussion of this draft should occur in one of these mailing lists:
TN3270E List (Roger Fajman raf@cu.nih.gov). Send subscription
requests as e-mail with "subscribe tn3270e your_full_name" to
listserv@list.nih.gov.
Midrange-L List (David Gibbs david@midrange.com). Send
subscription requests as email with "subscribe midrange-l
your_internet_address" to majordomo@midrange.com.
Telnet Working Group Mailing List: Send subscription requests as
email with "subscribe telnet-ietf" to telnet-ietf-
request@bsdi.com.
14. References
[1] IBM, "IBM 5250 Information Display System, Functions Reference
Manual", SA21-9247-6, March 1987.
[2] IBM, "5494 Remote Control Unit, Functions Reference", SC30-
3533-03, November 1994.
[3] IBM, "AS/400 System API Reference", SC41-5801, February 1998.
[4] IBM, "AS/400 TCP/IP Configuration and Reference", SC41-5420-01,
February 1998.
[5] IBM, "AS/400 Communications Configuration", SC41-5401-00, August
1997.
[6] IBM, "SNA Formats", GA27-3136-13, November 1993.
[7] IBM, "Using the Pageprinter 3812 with System/36 or System/38",
S544-3343-01, September 1997.
[8] Postel, J. and J. Reynolds, "TELNET PROTOCOL SPECIFICATION", RFC
854, USC/Information Sciences Institute, May 1983.
[9] Postel, J. and J. Reynolds, "TELNET OPTION SPECIFICATIONS", RFC
855, USC/Information Sciences Institute, May 1983.
[10] Postel, J. and J. Reynolds, "TELNET BINARY TRANSMISSION", RFC
856, USC/Information Sciences Institute, May 1983.
[11] VanBokkeln, J., "Telnet Terminal-Type Option", RFC 1091, FTP
Murphy, Rieth & Stevens [Page 36]
Internet Draft 5250 Telnet Enhancements February 1998
Software, Inc., February 1989.
[12] Postel, J. and J. Reynolds, "TELNET END OF RECORD OPTION", RFC
885, USC/Information Sciences Institute, December 1983.
[13] Alexander, S., "Telnet Environment Option", RFC 1572, Lachman
Technology, Inc., January 1994.
[14] Chmielewski, P., "5250 Telnet Interface", RFC 1205, IBM
Corporation, February 1991.
[15] Postel, J. and J. Reynolds, "TELNET SUPPRESS GO AHEAD OPTION",
RFC 858, Information Sciences Institute, May 1983.
[16] IBM, "AS/400 National Language Support", SC41-5101-01, February
1998.
[17] Data Encryption Standard, Federal Information Processing
Standards Publication 46, January 15, 1977.
[18] Reynolds, J., and J. Postel, "Assigned Numbers", RFC 1700, STD
2, USC/Information Sciences Institute, October 1994.
15. Security Considerations
Security considerations of passwords are discussed in Section 6.
16. Author's Address
Thomas E. Murphy, Jr. Phone: (607) 752-5482
IBM Corporation Fax: (607) 752-5421
1701 North Street Email: murphyte@us.ibm.com
Endicott, NY 13760
Paul F. Rieth Phone: (607) 752-5474
IBM Corporation Fax: (607) 752-5421
1701 North Street Email: rieth@us.ibm.com
Endicott, NY 13760
Jeffrey S. Stevens Phone: (607) 752-5488
IBM Corporation Fax: (607) 752-5421
1701 North Street Email: jssteven@us.ibm.com
Endicott, NY 13760
Murphy, Rieth & Stevens [Page 37]
Internet Draft 5250 Telnet Enhancements February 1998
17. Relation to Other RFC's
UPDATES
This draft is an update to RFC 1205 [14], which describes the 5250
Telnet Interface. This update enhances that description to
include device negotiation as well as printer support.
This draft makes use of RFC 1572 [13] to enhance communications
with 5250 Telnet clients. RFC 1572 is currently on the Standards
Track as a Proposed Standard, and is listed in Assigned Numbers
[18].
Murphy, Rieth & Stevens [Page 38]
