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+RFC #431                                       Mark Krilanovich
+NIC #13300                                     UCSB
+Updates:  122                                  Dec.  15, 1972
+Obsoletes:  399
+
+                    Update on SMFS Login and Logout
+
+       This document replaces RFC 399, which introduced the Login
+and Logout commands for UCSB's SMFS, but was incomplete.  RFC 399
+is restated here, followed by a description of the nature of the
+response elicted by these commands
+
+       Two new commands have been added to UCSB's Simple Minded
+File System (SMFS).  They are described below.
+
+       Login (LGI)
+       The Login command is the means whereby the user identifies
+himself and specifies the account number to which his use of SMFS
+is to be billed.  The user should issue a LGI command directly
+after completing the ICP and before any command referencing a
+file.  The user name and account number specified remain in
+effect until another LGI command is issued, a LGO command is
+issued, or the connection is close.
+
+       At present, the use of SMFS is not billed, and therefore
+use of the accounting command is optional.  It is requested,
+however, that users and user processes begin to use this command
+as soon as possible, since we would like to collect statistics on
+SMFS utilization before implementing billing.  Therefore, at
+present the user name can be any name that identifies the user,
+and the account number is completely arbitrary.
+
+       The format of the LGI command is given below.  Note that
+the lengths of the fixed-length fields are given in bits.  The op
+code for LGI is decimal 13.
+
+           8
+       <op code><user name><account number>
+
+The <user name> and <account number> fields are further divided
+
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+                                                                [Page 1]
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+NWG/RFC #431                           MCK 15-DEC-72 12:39  13300
+Update on SMFS Login and Logout
+
+as follows:
+
+          8     8*length
+      <length><user name>
+
+Where <length> gives the length in 8-bit characters of the <user
+name> or <account number> subfield.  The maximum length of <user
+name> is eight characters and of <account number> is four
+characters.  The <user name> and <account number> fields must
+consist of characters chosen from the same character set as
+filenames.
+
+        Logout (LGO)
+       The logout command terminates the association between the
+user and the accounting information specified in the last LGI
+command issued, if any; it does not cause SMFS to close the
+connection.  The user should then issue another LGI command
+before attempting any operation referencing a file. It is not
+necessary to issue a LGO command before issuing another LGI
+command, or before closing the connection.
+
+       Again, at the present time the LGO command is optional,
+and does not affect the user's ability to reference files.
+
+       The format of the LGO command is as follows:
+
+           8
+       <op code>
+
+The op code for LGO is decimal 14.
+
+        Login and logout each elicit, as their only response, an
+eight-bit completion code.  Like the other SMFS commands, the
+completion code is equal to the command's op code if the command
+was successful.  The following error completion codes, given in
+decimal, are currently defined:
+
+
+       47      The length of <user name> is zero.
+       48      <user name> is too long.
+       49      <user name> contains invalid characters.
+       50      The length of <account number> is zero.
+
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+                                                                [Page 2]
+
+NWG/RFC# 431                           MCK 15-DEC-72 12:39 13300
+Update on SMFS Login and Logout
+
+
+       51      <account number> is too long.
+       52      <account number> contains invalid characters.
+       53      <user name) specifies an invalid user.
+       54      <account number> specifies an invalid account.
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+       [ This RFC was put into machine readable form for entry ]
+       [ into the online RFC archives by BBN Corp. under the   ]
+       [ direction of Alex McKenzie.                      1/97 ]
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+                                                                [Page 3]
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