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. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" $FreeBSD$ 35.\" 36.Dd September 1, 1996 37.Dt RCMDSH 3 38.Os 39.Sh NAME 40.Nm rcmdsh 41.Nd return a stream to a remote command without superuser 42.Sh SYNOPSIS 43.Fd #include <unistd.h> 44.Ft int 45.Fn rcmdsh "char **ahost" "int inport" "const char *locuser" "const char *remuser" "const char *cmd" "char *rshprog" 46.Sh DESCRIPTION 47The 48.Fn rcmdsh 49function 50is used by normal users to execute a command on 51a remote machine using an authentication scheme based 52on reserved port numbers using 53.Xr rshd 8 54or the value of 55.Fa rshprog 56(if non-null). 57.Pp 58The 59.Fn rcmdsh 60function 61looks up the host 62.Fa *ahost 63using 64.Xr gethostbyname 3 , 65returning \-1 if the host does not exist. 66Otherwise 67.Fa *ahost 68is set to the standard name of the host 69and a connection is established to a server 70residing at the well-known Internet port 71.Li shell/tcp 72(or whatever port is used by 73.Fa rshprog 74). The parameter 75.Fa inport 76is ignored; it is only included to provide an interface similar to 77.Xr rcmd 3 . 78.Pp 79If the connection succeeds, 80a socket in the 81.Tn UNIX 82domain of type 83.Dv SOCK_STREAM 84is returned to the caller, and given to the remote 85command as stdin and stdout, and stderr. 86.Sh DIAGNOSTICS 87The 88.Fn rcmdsh 89function 90returns a valid socket descriptor on success. 91It returns \-1 on error and prints a diagnostic message on the standard error. 92.Sh SEE ALSO 93.Xr rsh 1 , 94.Xr socketpair 2 , 95.Xr rcmd 3 , 96.Xr rshd 8 97.Sh BUGS 98If 99.Xr rsh 1 100gets an error a file descriptor is still returned instead of \-1. 101.Sh HISTORY 102The 103.Fn rcmdsh 104function first appeared in 105.Ox 2.0 . 106