rexecd(8N) — UTek W2.3



REXECD(8N)              COMMAND REFERENCE              REXECD(8N)



NAME
     rexecd - remote execution server

SYNOPSIS
     /etc/rexecd

DESCRIPTION
     Rexecd is the server for the rexec(3n) routine.  The server
     provides remote execution facilities with authentication
     based on user names and encrypted passwords.

     Rexecd is started by inetd(8n) when a service requests at
     the port indicated in the ``exec'' service specification;
     see services(5n).  When a service request is received the
     following protocol is initiated:

     1)   The server reads characters from the socket up to a
          null (`\0') byte.  The resultant string is interpreted
          as an ASCII number, base 10.

     2)   If the number received in step 1 is non-zero, it is
          interpreted as the port number of a secondary stream to
          be used for the stderr.  A second connection is then
          created to the specified port on the client's machine.

     3)   A null terminated user name of at most 16 characters is
          retrieved on the initial socket.

     4)   A null terminated, encrypted, password of at most 16
          characters is retrieved on the initial socket.

     5)   A null terminated command to be passed to a shell is
          retrieved on the initial socket.  The length of the
          command is limited by the upper bound on the size of
          the system's argument list.

     6)   Rexecd then validates the user as is done at login time
          and, if the authentication was successful, changes to
          the user's home directory, and establishes the user and
          group protections of the user.  If any of these steps
          fail the connection is aborted with a diagnostic
          message returned.

     7)   A null byte is returned on the connection associated
          with the stderr and the command line is passed to the
          normal login shell of the user.  The shell inherits the
          network connections established by rexecd.

DIAGNOSTICS
     All diagnostic messages are returned on the connection
     associated with the stderr, after which any network
     connections are closed.  An error is indicated by a leading



Printed 10/17/86                                                1



REXECD(8N)              COMMAND REFERENCE              REXECD(8N)



     byte with a value of 1 (0 is returned in step 7 above upon
     successful completion of all the steps prior to the command
     execution).

     username too long
     The name is longer than 16 characters.

     password too long
     The password is longer than 16 characters.

     command too long
     The command line passed exceeds the size of the argument
     list (as configured into the system).

     Login incorrect.
     No password file entry for the user name existed or the
     wrong password was supplied.

     No remote directory.
     The chdir command to the home directory failed.

     Try again.
     A fork by the server failed.

     /bin/sh: ...
     The user's login shell could not be started.

RETURN VALUE
     [0] Rexecd is running.

     [1] Rexecd is not running.

     [USAGE]        Incorrect command line syntax. Execution
                    terminated.

     [P_ERR]        A system error occurred. Execution
                    terminated.  See intro(2) for more
                    information on system errors.

     [NP_WARN]      An error warranting a warning message
                    occurred. Execution continues.

SEE ALSO
     rexec(3n), inetd(8n).











Printed 10/17/86                                                2

%%index%%
na:72,68;
sy:140,141;
de:281,2225;
di:2506,296;2946,927;
rv:3873,590;
se:4463,114;
%%index%%000000000116

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