1.\" $OpenBSD: rcmdsh.3,v 1.6 1999/07/05 04:41:00 aaron Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" $FreeBSD$ 31.\" 32.Dd September 1, 1996 33.Dt RCMDSH 3 34.Os 35.Sh NAME 36.Nm rcmdsh 37.Nd return a stream to a remote command without superuser 38.Sh SYNOPSIS 39.In unistd.h 40.Ft int 41.Fo rcmdsh 42.Fa "char **ahost" 43.Fa "int inport" 44.Fa "const char *locuser" 45.Fa "const char *remuser" 46.Fa "const char *cmd" 47.Fa "const char *rshprog" 48.Fc 49.Sh DESCRIPTION 50The 51.Fn rcmdsh 52function 53is used by normal users to execute a command on 54a remote machine using an authentication scheme based 55on reserved port numbers using 56.Xr rshd 8 57or the value of 58.Fa rshprog 59(if 60.No non- Ns Dv NULL ) . 61.Pp 62The 63.Fn rcmdsh 64function 65looks up the host 66.Fa *ahost 67using 68.Xr gethostbyname 3 , 69returning \-1 if the host does not exist. 70Otherwise 71.Fa *ahost 72is set to the standard name of the host 73and a connection is established to a server 74residing at the well-known Internet port 75.Dq Li shell/tcp 76(or whatever port is used by 77.Fa rshprog ) . 78The 79.Fa inport 80argument 81is ignored; it is only included to provide an interface similar to 82.Xr rcmd 3 . 83.Pp 84If the connection succeeds, 85a socket in the 86.Ux 87domain of type 88.Dv SOCK_STREAM 89is returned to the caller, and given to the remote 90command as 91.Dv stdin , stdout , 92and 93.Dv stderr . 94.Sh RETURN VALUES 95The 96.Fn rcmdsh 97function 98returns a valid socket descriptor on success. 99Otherwise, \-1 is returned 100and a diagnostic message is printed on the standard error. 101.Sh SEE ALSO 102.Xr rsh 1 , 103.Xr socketpair 2 , 104.Xr rcmd 3 , 105.Xr rshd 8 106.Sh HISTORY 107The 108.Fn rcmdsh 109function first appeared in 110.Ox 2.0 , 111and made its way into 112.Fx 4.6 . 113.Sh BUGS 114If 115.Xr rsh 1 116encounters an error, a file descriptor is still returned instead of \-1. 117