1.\" $OpenBSD: rcmdsh.3,v 1.8 2000/12/24 00:30:56 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.Dd September 1, 1996 35.Dt RCMDSH 3 36.Os 37.Sh NAME 38.Nm rcmdsh 39.Nd return a stream to a remote command without superuser 40.Sh SYNOPSIS 41.Fd #include <unistd.h> 42.Ft int 43.Fn rcmdsh "char **ahost" "int inport" "const char *locuser" "const char *remuser" "const char *cmd" "char *rshprog" 44.Sh DESCRIPTION 45The 46.Fn rcmdsh 47function is used by normal users to execute a command on a remote machine 48using an authentication scheme based on reserved port numbers using 49.Xr rshd 8 50or the value of 51.Fa rshprog 52(if non-null). 53.Pp 54The 55.Fn rcmdsh 56function looks up the host 57.Fa *ahost 58using 59.Xr gethostbyname 3 , 60returning \-1 if the host does not exist. 61Otherwise 62.Fa *ahost 63is set to the standard name of the host and a connection is established to 64a server residing at the well-known Internet port 65.Li shell/tcp 66(or whatever port is used by 67.Fa rshprog ) . 68The parameter 69.Fa inport 70is ignored; it is only included to provide an interface similar to 71.Xr rcmd 3 . 72.Pp 73If the connection succeeds, a socket in the 74.Tn UNIX 75domain of type 76.Dv SOCK_STREAM 77is returned to the caller, and given to the remote 78command as stdin and stdout, and stderr. 79.Sh DIAGNOSTICS 80The 81.Fn rcmdsh 82function returns a valid socket descriptor on success. 83It returns \-1 on error and prints a diagnostic message on the standard error. 84.Sh SEE ALSO 85.Xr rsh 1 , 86.Xr socketpair 2 , 87.Xr rcmd 3 , 88.Xr rshd 8 89.Sh BUGS 90If 91.Xr rsh 1 92encounters an error, a file descriptor is still returned instead of \-1. 93.Sh HISTORY 94The 95.Fn rcmdsh 96function first appeared in 97.Ox 2.0 . 98