Index of Section 1 Manual Pages
|Interix / SUA||rexecd.1||Interix / SUA
rexecd - remote execution server
The rexecd(1) utility is the server for the rexec(3) routine. The server
provides remote execution facilities with authentication based on user
names and passwords.
The rexecd(1) utility listens for service requests at the port indicated
in the "exec" service specification. When a service request is received,
the following protocol is initiated:
1. The server reads characters from the socket up to a NUL (\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
3. A NUL terminated user name of at most 128 characters is retrieved on
the initial socket (the value is 16 characters for non-Interix
4. A NUL terminated, unencrypted password of at most 128 characters is
retrieved on the initial socket (the value 16 characters for non-
5. A NUL 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. The rexecd(1) utility 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 fails, the connection
is aborted with a diagnostic message returned.
7. A NUL byte is returned on the initial socket and the command line is
passed to the normal login shell of the user. The shell inherits the
network connections established by rexecd.(1)
Except for the last one listed below, all diagnostic messages are returned
on the initial socket, after which any network connections are closed. An
error is indicated by a leading byte with a value of 1. A 0 is returned in
step 7 discussed previously, upon successful completion of all the steps
prior to the command execution.
username too long
The name is longer than 128 characters.
password too long
The password is longer than 128 characters.
command too long
The command line passed exceeds the size of the argument list (as
configured into the system).
No user database entry for the user name existed or the wrong password
No remote directory.
The chdir(1) command to the home directory failed.
A fork(2) by the server failed.
The user's login shell could not be started. This message is returned
on the connection associated with the stderr, and is not preceded by a