in.rexecd(1M)
NAME
in.rexecd, rexecd - remote execution server
SYNOPSIS
in.rexecd
DESCRIPTION
in.rexecd is the server for the rexec(3SOCKET) routine. The
server provides remote execution facilities with authentica-
tion based on user names and passwords. It is invoked
automatically as needed by inetd(1M), 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 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 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 com-
mand 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 and a diagnostic message is
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.
USAGE
in.rexecd and rexecd are IPv6-enabled. See ip6(7P).
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWrcmds |
|_____________________________|_____________________________|
SEE ALSO
inetd(1M), rexec(3SOCKET), inetd.conf(4), attributes(5),
ip6(7P)
DIAGNOSTICS
All diagnostic messages are returned on the connection asso-
ciated with the stderr, 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 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 argu-
ment list (as configured into the system).
Login incorrect.
No password file entry for the user name existed.
Password incorrect.
The wrong password was supplied.
No remote directory.
The chdir command to the home directory failed.
Try again.
A fork by the server failed.
/usr/bin/sh: ...
The user's login shell could not be started.
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