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+Network Working Group                                        D. Waitzman
+Request For Comments: 1073                                       BBN STC
+                                                            October 1988
+
+                       Telnet Window Size Option
+
+Status of this Memo
+
+   This RFC describes a proposed Telnet option to allow a client to
+   convey window size to a Telnet server.  Distribution of this memo is
+   unlimited.
+
+1. Command Name and Option Code
+
+      Name = NAWS (Negotiate About Window Size)
+
+      Code = 31
+
+2. Command Meanings
+
+      IAC WILL NAWS
+
+         Sent by the Telnet client to suggest that NAWS be used.
+
+      IAC WON'T NAWS
+
+         Sent by the Telnet client to refuse to use NAWS.
+
+      IAC DO NAWS
+
+         Sent by the Telnet server to suggest that NAWS be used.
+
+      IAC DON'T NAWS
+
+         Sent by the Telnet server to refuse to use NAWS.
+
+      IAC SB NAWS <16-bit value> <16-bit value> IAC SE
+
+         Sent by the Telnet client to inform the Telnet server of the
+         window width and height.
+
+   The window size information is conveyed via this option from the
+   Telnet client to the Telnet server.  The information is advisory.
+   The server may accept the option, but not use the information that is
+   sent.
+
+   The client and server negotiate sending the window size information
+   using the standard Telnet WILL/DO/DON'T/WON'T mechanism.  If the
+
+
+
+Waitzman                                                        [Page 1]
+
+RFC 1073               Telnet Window Size Option            October 1988
+
+
+   client and server agree, the client may then send a subnegotiation to
+   convey the window size.  If the client's window size is later changed
+   (for instance, the window size is altered by the user), the client
+   may again send the subnegotiation.  Because certain operating
+   systems, on which a server may be executing, may not allow the window
+   size information to be updated, the server may send a DON'T NAWS to
+   the client to forbid further subnegotiation after it was initially
+   accepted.  A negotiation loop will not form following these rules.
+
+   The subnegotiation consists of two values, the width and the height
+   of the window in characters.  The values are each sent as two bytes,
+   in the Internet standard byte and bit order.  This allows a maximum
+   window width or height of 65535 characters.  A value equal to zero is
+   acceptable for the width (or height), and means that no character
+   width (or height) is being sent.  In this case, the width (or height)
+   that will be assumed by the Telnet server is operating system
+   specific (it will probably be based upon the terminal type
+   information that may have been sent using the TERMINAL TYPE Telnet
+   option).
+
+   The syntax for the subnegotiation is:
+
+      IAC SB NAWS WIDTH[1] WIDTH[0] HEIGHT[1] HEIGHT[0] IAC SE
+
+   As required by the Telnet protocol, any occurrence of 255 in the
+   subnegotiation must be doubled to distinguish it from the IAC
+   character (which has a value of 255).
+
+3. Default Specification
+
+      WON'T NAWS
+
+      DON'T NAWS
+
+   This option does not assume any default window size information.
+   Often the terminal type, passed with the TERMINAL TYPE Telnet option,
+   may imply a window size, but that is not necessary for this option.
+
+4. Motivation
+
+   With the increasing popularity of windowing systems, a Telnet client
+   is often run inside a variable-sized window, and the Telnet server
+   needs to know the window size for proper cursor control.  The window
+   may also have its size changed during the Telnet session and the
+   updated window size needs to be conveyed to the server.  This memo
+   specifies an option to send the window height and width in characters
+   from a client to a server.
+
+
+
+
+Waitzman                                                        [Page 2]
+
+RFC 1073               Telnet Window Size Option            October 1988
+
+
+   The Telnet options Negotiate Output Line Width (NAOL) and Negotiate
+   Output Page Size (NAOP) do not have the correct semantics for this
+   purpose, and they are not in common use [see RFC-1011 "Official
+   Internet Protocols", and the "Defense Protocol Handbook"].  The NAOL
+   and NAOP options are bidirectional (i.e., the server might control
+   the client's line width or page size), and are limited to 253
+   characters in each axis.
+
+   This option is a better model of the normal window negotiation
+   process.  The client has total control over the size of its window
+   and simply tells the server what the current window size is.
+   Furthermore, the 253 character height and width limitation is too low
+   so the new option has a limit of 65535 characters.  Finally, this
+   option sends the window height and width concurrently because they
+   are typically changed simultaneously and many operating systems and
+   windowing applications prefer to think in terms of simultaneous
+   changes in height and width.
+
+5. Description and Implementation Notes
+
+   A typical user of this option might be a Telnet client running under
+   X.  After a user resizes the client's window, this must be
+   communicated to the Telnet client.  In 4.3 BSD Unix, the signal
+   SIGWINCH (window changed) might be caught by the Telnet process and a
+   new NAWS subnegotiation sent to the server.  Upon receipt of a NAWS
+   subnegotiation, the server might do the appropriate ioctl to handle
+   the new information, and then could send a SIGWINCH to its child,
+   probably a shell.
+
+6. Examples
+
+   In the following examples all numbers in the data stream are in
+   decimal.
+
+      1. Server suggest and client agrees to use NAWS.
+
+         (server sends)  IAC DO NAWS
+         (client sends)  IAC WILL NAWS
+         (client sends)  IAC SB NAWS 0 80 0 24 IAC SE
+
+            [A window 80 characters wide, 24 characters high]
+            [some time occurs and the user changes the window size]
+
+         (client sends)  IAC SB NAWS 0 80 0 64 IAC SE
+
+            [A window 80 characters wide, 64 characters high]
+
+
+
+
+
+Waitzman                                                        [Page 3]
+
+RFC 1073               Telnet Window Size Option            October 1988
+
+
+      In all numeric form:
+
+         (server sends)  255 253 31
+         (client sends)  255 251 31
+         (client sends)  255 250 31 0 80 0 24 255 240
+
+         (client sends)  255 250 31 0 80 0 64 255 240
+
+       2.  Client suggests and server agrees to used NAWS.
+
+         (client sends)  IAC WILL NAWS
+         (server sends)  IAC DO NAWS
+         (client sends)  IAC SB NAWS 1 44 0 24 IAC SE
+
+            [A window 300 characters wide, 24 characters high]
+
+       3.  Client suggest and server refuses to use NAWS.
+
+         (client sends)  IAC WILL NAWS
+         (server sends)  IAC DON'T NAWS
+
+       4.  Server suggests and client refuses to use NAWS.
+
+         (server sends)  IAC DO NAWS
+         (client sends)  IAC WON'T NAWS
+
+7. Acknowledgments
+
+   A more elaborate, X window system specific, version of this option
+   has been implemented at Carnegie-Mellon University by Glenn Marcy and
+   the author.  It is widely used in the Carnegie-Mellon University
+   Computer Science Department.  Mr. Marcy helped write an early draft
+   of this memo documenting the more elaborate option.
+
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+Waitzman                                                        [Page 4]
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