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