117 lines
3.2 KiB
Groff
117 lines
3.2 KiB
Groff
.\" $OpenBSD: rcmdsh.3,v 1.6 1999/07/05 04:41:00 aaron Exp $
|
|
.\"
|
|
.\" Copyright (c) 1983, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd September 1, 1996
|
|
.Dt RCMDSH 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm rcmdsh
|
|
.Nd return a stream to a remote command without superuser
|
|
.Sh SYNOPSIS
|
|
.In unistd.h
|
|
.Ft int
|
|
.Fo rcmdsh
|
|
.Fa "char **ahost"
|
|
.Fa "int inport"
|
|
.Fa "const char *locuser"
|
|
.Fa "const char *remuser"
|
|
.Fa "const char *cmd"
|
|
.Fa "const char *rshprog"
|
|
.Fc
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn rcmdsh
|
|
function
|
|
is used by normal users to execute a command on
|
|
a remote machine using an authentication scheme based
|
|
on reserved port numbers using
|
|
.Xr rshd 8
|
|
or the value of
|
|
.Fa rshprog
|
|
(if
|
|
.No non- Ns Dv NULL ) .
|
|
.Pp
|
|
The
|
|
.Fn rcmdsh
|
|
function
|
|
looks up the host
|
|
.Fa *ahost
|
|
using
|
|
.Xr gethostbyname 3 ,
|
|
returning \-1 if the host does not exist.
|
|
Otherwise
|
|
.Fa *ahost
|
|
is set to the standard name of the host
|
|
and a connection is established to a server
|
|
residing at the well-known Internet port
|
|
.Dq Li shell/tcp
|
|
(or whatever port is used by
|
|
.Fa rshprog ) .
|
|
The
|
|
.Fa inport
|
|
argument
|
|
is ignored; it is only included to provide an interface similar to
|
|
.Xr rcmd 3 .
|
|
.Pp
|
|
If the connection succeeds,
|
|
a socket in the
|
|
.Ux
|
|
domain of type
|
|
.Dv SOCK_STREAM
|
|
is returned to the caller, and given to the remote
|
|
command as
|
|
.Dv stdin , stdout ,
|
|
and
|
|
.Dv stderr .
|
|
.Sh RETURN VALUES
|
|
The
|
|
.Fn rcmdsh
|
|
function
|
|
returns a valid socket descriptor on success.
|
|
Otherwise, \-1 is returned
|
|
and a diagnostic message is printed on the standard error.
|
|
.Sh SEE ALSO
|
|
.Xr rsh 1 ,
|
|
.Xr socketpair 2 ,
|
|
.Xr rcmd 3 ,
|
|
.Xr rshd 8
|
|
.Sh HISTORY
|
|
The
|
|
.Fn rcmdsh
|
|
function first appeared in
|
|
.Ox 2.0 ,
|
|
and made its way into
|
|
.Fx 4.6 .
|
|
.Sh BUGS
|
|
If
|
|
.Xr rsh 1
|
|
encounters an error, a file descriptor is still returned instead of \-1.
|