Message Send Protocol 2 (RFC1312)
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2000-Sep-12
Internet Society Requests For Comment (RFCs)
R. Nelson: AUTHOR [+2]
Status of this Memo
Network Working Group R. Nelson
Request for Comments: 1312 Crynwr Software
Obsoletes: RFC 1159 G. Arnold
Sun Microsystems, Inc.
Message Send Protocol 2
Status of this Memo
This memo defines an Experimental Protocol for the Internet
community. Discussion and suggestions for improvement are requested.
Please refer to the current edition of the "IAB Official Protocol
Standards" for the standardization state and status of this protocol.
Distribution of this memo is unlimited.
The Message Send Protocol is used to send a short message to a given
user on a given terminal on a given host. Unix's write command
offers a limited form of this service through its host-local write
command. This service is also known on some hosts as "SEND".
As the Internet grows, more and more people are using hosts that do
not run Internet protocols at all times. These hosts may be able to
use a simple protocol that can be implemented using UDP and IP. The
Message Send Protocol is one such protocol.
Note that a message sending protocol is already defined using TCP.
The SMTP protocol includes a "SEND" command that will direct mail to
a user's terminal. SMTP's SEND is not useful in this instance
because SMTP's SEND is not implemented by the majority of vendors at
this time, and is difficult to use by unskilled users. For the
purposes of standardization, we will include a TCP based Message Send
The message consists of several parts, all of which must be present
The first part is a single octet indicating the protocol revision,
currently decimal 66, 'B'. The remaining parts are null-terminated
sequences of eight-bit characters in the ISO 8859/1 alphabet. Some
parts may be empty. All comparisons of parts (e.g., recipient,
cookie, etc.) are case-insensitive. The parts are as follows:
RECIPIENT The name of the user that the message is directed to.
If this part is empty, the message may be delivered to
any user of the destination system.
RECIP-TERM The name of the terminal to which the message is to be
delivered. The syntax and semantics of terminal names
are outside the scope of this specification. If this
part is empty, the "right" terminal is chosen. This is
a system-dependent function. If this part consists of
the string "*", all terminals on the destination
system are implied. If the RECIPIENT part is empty
but the RECIP-TERM is not, the message is written on
the specified terminal. If both the RECIPIENT and
RECIP-TERM parts are empty, the...