Sun Microsystems Sun Workstation 100U System Manager's Manual page 233

REXECD(8C)
MAINTENANCE COMMANDS REXECD(8C)
NAME
rexecd - remote execution server
SYNOPSIS
/usr /etc/In.rexecd host.port
DESCRIPTION
Re:zecd is the server for the rexec(3N) routine. The server provides remote execution facilities
with authentication based on user names and encrypted passwords. It is invoked automatically as
needed by inetd(8C), and then executes the following protocol:
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 IItderr. A second connection is then crea.ted 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.
S) 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 argu-
ment list.
6) R execd then validates the user
38
is done at login time and, if the authentication was suc-
cessful, changes to the user's home directory, and establishes the user and group protec-
tions 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 IItderr and the command
line is passed to the normal login shell of the user. The shell inherits the network connec-
tions established by rexecd.
DIAGNOSTICS
78
All diagnostic messages are returned on the connection associated with the .tderr, after which
any network connections are closed. An error is indicated by a leading byte with a value of 1 (0
is returned in step 7 above upon successful completion of all the steps prior to the command exe-
cution).
"user name too Ions"
The name is longer tha.n 16 characters.
"password too Ions"
The password is longer than 16 characters.
"command too lonl "
The command line passed exceeds the size of the argument list (as configured into the system).
"Lolln lncorrect~
tt
No password file entry for the user name existed.
"P ... word incorrect.
tt
The wrong password was supplied.
"No remote directory."
The chdir command to the home directory failed.
"Try alaln.
tt
A fork by the server failed.
Last change: 28 October 1983
Sun Release 1.1