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-.\"     $OpenBSD: rcmdsh.3,v 1.18 2016/05/28 15:48:30 millert 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.
-.\" 3. 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.
-.\"
-.Dd $Mdocdate: May 28 2016 $
-.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
-.Fn rcmdsh "char **ahost" "int inport" "const char *locuser" "const char *remuser" "const char *cmd" "char *rshprog"
-.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 ssh 1
-or the value of
-.Fa rshprog
-(if non-null).
-.Fa rshprog
-may be a fully-qualified path, a non-qualified command, or a command containing
-space-separated command line arguments.
-.Pp
-The
-.Fn rcmdsh
-function looks up the host
-.Fa *ahost
-using
-.Xr getaddrinfo 3
-and, if the host exists,
-.Fa *ahost
-is set to the canonical name of the host.
-A connection is then established to
-a server residing at the well-known Internet port
-.Li shell/tcp
-(or whatever port is used by
-.Fa rshprog ) .
-The parameter
-.Fa inport
-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 Ns -domain
-of type
-.Dv SOCK_STREAM
-is returned to the caller, and given to the remote
-command as stdin and stdout, and stderr.
-.Sh DIAGNOSTICS
-The
-.Fn rcmdsh
-function returns a valid socket descriptor on success.
-It returns \-1 on error and prints a diagnostic message on the standard error.
-.Sh SEE ALSO
-.Xr ssh 1 ,
-.Xr socketpair 2 ,
-.Xr rcmd 3
-.Sh HISTORY
-The
-.Fn rcmdsh
-function first appeared in
-.Ox 2.0 .
-.Sh BUGS
-If
-.Xr ssh 1
-encounters an error, a file descriptor is still returned instead of \-1.