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.Dd September 1, 1996 31.Dt RCMDSH 3 32.Os 33.Sh NAME 34.Nm rcmdsh 35.Nd return a stream to a remote command without superuser 36.Sh SYNOPSIS 37.In unistd.h 38.Ft int 39.Fo rcmdsh 40.Fa "char **ahost" 41.Fa "int inport" 42.Fa "const char *locuser" 43.Fa "const char *remuser" 44.Fa "const char *cmd" 45.Fa "const char *rshprog" 46.Fc 47.Sh DESCRIPTION 48The 49.Fn rcmdsh 50function 51is used by normal users to execute a command on 52a remote machine using an authentication scheme based 53on reserved port numbers using 54.Xr rshd 8 55or the value of 56.Fa rshprog 57(if 58.No non- Ns Dv NULL ) . 59.Pp 60The 61.Fn rcmdsh 62function 63looks up the host 64.Fa *ahost 65using 66.Xr gethostbyname 3 , 67returning \-1 if the host does not exist. 68Otherwise 69.Fa *ahost 70is set to the standard name of the host 71and a connection is established to a server 72residing at the well-known Internet port 73.Dq Li shell/tcp 74(or whatever port is used by 75.Fa rshprog ) . 76The 77.Fa inport 78argument 79is ignored; it is only included to provide an interface similar to 80.Xr rcmd 3 . 81.Pp 82If the connection succeeds, 83a socket in the 84.Ux 85domain of type 86.Dv SOCK_STREAM 87is returned to the caller, and given to the remote 88command as 89.Dv stdin , stdout , 90and 91.Dv stderr . 92.Sh RETURN VALUES 93The 94.Fn rcmdsh 95function 96returns a valid socket descriptor on success. 97Otherwise, \-1 is returned 98and a diagnostic message is printed on the standard error. 99.Sh SEE ALSO 100.Xr rsh 1 , 101.Xr socketpair 2 , 102.Xr rcmd 3 , 103.Xr rshd 8 104.Sh HISTORY 105The 106.Fn rcmdsh 107function first appeared in 108.Ox 2.0 , 109and made its way into 110.Fx 4.6 . 111.Sh BUGS 112If 113.Xr rsh 1 114encounters an error, a file descriptor is still returned instead of \-1. 115