RFC 1258 (rfc1258) - Page 2 of 5

BSD Rlogin

RFC 1258                       BSD Rlogin                 September 1991


   may follow this initial exchange (see below).

From Client to Server (and Flow Control)

   Initially, the client begins operation in "cooked" (as opposed to
   to "raw") mode.  In this mode, the START and STOP (usually ASCII
   DC1,DC3) characters are intercepted and interpreted by the client to
   start and stop output from the remote server to the local terminal,
   whereas all other characters are transmitted to the remote host as
   they are received.  (But see below for the handling of the
   local-escape character.)

   In "raw" mode, the START and STOP characters are not processed
   locally, but are sent as any other character to the remote server.
   The server thus determines the semantics of the START and STOP
   characters when in "raw" mode; they may be used for flow control or
   have quite different meanings independent of their ordinary usage on
   the client.

Screen/Window Size

   The remote server indicates to the client that it can accept window
   size change information by requesting a window size message (as
   described below) just after connection establishment and user
   identification exchange.  The client should reply to this request
   with the current window size.

   If the remote server has indicated that it can accept client window
   size changes and the size of the client's window or screen dimensions
   changes, a 12-byte special sequence is sent to the remote server to
   indicate the current dimensions of the client's window, should the
   user process running on the server care to make use of that
   information.

   The window change control sequence is 12 bytes in length, consisting
   of a magic cookie (two consecutive bytes of hex FF), followed by two
   bytes containing lower-case ASCII "s", then 8 bytes containing the
   16-bit values for the number of character rows, the number of
   characters per row, the number of pixels in the X direction, and the
   number of pixels in the Y direction, in network byte order.  Thus:

        FF FF s s rr cc xp yp

   Other flags than "ss" may be used in future for other in-band control
   messages.  None are currently defined.






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