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Network Working Group G. Marcy
Request for Comments: 1096 Carnegie Mellon University
March 1989


Telnet X Display Location Option

Status of This Memo

This RFC specifies a standard for the Internet community. Hosts on
the Internet that transmit the X display location within the Telnet
protocol are expected to adopt and implement this standard.
Distribution of this memo is unlimited.

This standard is modelled on RFC 1079 [1], the telnet terminal speed
option. Much of the text of this document is copied from that RFC.

Motivation

When a user is running the Telnet client under the X window system,
it is useful for the remote Telnet to know the X display location of
that client. For example, the user might wish to start other X
applications from the remote host using the same display location as
the Telnet client. The purpose of this option is to make this
information available through telnet connections.

1. Command Name and Code

X-DISPLAY-LOCATION (XDISPLOC)

Code = 35

2. Command Meanings

IAC WILL X-DISPLAY-LOCATION

Sender is willing to send the X display location in a
subsequent sub-negotiation.

IAC WON'T X-DISPLAY-LOCATION

Sender refuses to send the X display location.

IAC DO X-DISPLAY-LOCATION

Sender is willing to receive the X display location in a
subsequent sub-negotiation.




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RFC 1096 Telnet X Display Location Option March 1989


IAC DON'T X-DISPLAY-LOCATION

Sender refuses to accept the X display location.

IAC SB X-DISPLAY-LOCATION SEND IAC SE

Sender requests receiver to transmit his (the receiver's) X
display location. The code for SEND is 1. (See below.)

IAC SB X-DISPLAY-LOCATION IS ... IAC SE

Sender is stating his X display location. The code for IS is
0. (See below.)

3. Default

WON'T X-DISPLAY-LOCATION

The X display location will not be exchanged.

DON'T X-DISPLAY-LOCATION

The X display location will not be exchanged.

4. Description of the Option

WILL and DO are used only to obtain and grant permission for future
discussion. The actual exchange of status information occurs within
option subcommands (IAC SB X-DISPLAY-LOCATION...).

Once the two hosts have exchanged a WILL and a DO, the sender of the
DO X-DISPLAY-LOCATION is free to request the X display location.
Only the sender of the DO may send requests (IAC SB X-DISPLAY-
LOCATION SEND IAC SE) and only the sender of the WILL may transmit
actual X display location (within an IAC SB X-DISPLAY-LOCATION IS ...
IAC SE command). The X display location may not be sent
spontaneously, but only in response to a request.

The X display location is an NVT ASCII string. This string follows
the normal Unix convention used for the DISPLAY environment variable,
e.g.,

:[.]

No extraneous characters such as spaces may be included.

The following is an example of use of the option:




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RFC 1096 Telnet X Display Location Option March 1989


Host1: IAC DO X-DISPLAY-LOCATION

Host2: IAC WILL X-DISPLAY-LOCATION

(Host1 is now free to request status information at any time.)

Host1: IAC SB X-DISPLAY-LOCATION SEND IAC SE

Host2: IAC SB X-DISPLAY-LOCATION IS "SRI-NIC.ARPA:0.0" IAC SE

(This command is 22 octets.)

5. Implementation Suggestions

Since the X display location may not contain a hostname on the client
host, i.e., ":0" or "unix:0.0", the Telnet client will need to modify
the location appropriately before sending it on to the remote Telnet.

Reference

[1] Hedrick, C., "Telnet Terminal Speed Option", RFC 1079,
Rutgers University, December, 1988.

Author's Address:

Glenn A. Marcy
Carnegie Mellon University
School of Computer Science
Pittsburgh, PA 15213-3890

Phone: (412) 268-7669

Email: Glenn.Marcy@CS.CMU.EDU


















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