1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" $FreeBSD: src/share/man/man5/hosts.equiv.5,v 1.10.2.6 2002/02/01 15:51:18 ru Exp $ 29.\" 30.Dd December 31, 2017 31.Dt HOSTS.EQUIV 5 32.Os 33.Sh NAME 34.Nm hosts.equiv , 35.Nm .rhosts 36.Nd trusted remote host and user name data base 37.Sh DESCRIPTION 38The 39.Nm 40and 41.Nm .rhosts 42files contain information regarding 43trusted hosts and users on the network. 44For each host a single line should be present 45with the following information: 46.Pp 47simple 48.Bd -unfilled -offset indent 49hostname [username] 50.Ed 51.Pp 52or the more verbose 53.Bd -unfilled -offset indent 54[+-][hostname|@netgroup] [[+-][username|@netgroup]] 55.Ed 56.Pp 57A 58.Dq @ 59indicates a host by netgroup or user by netgroup. 60A single 61.Dq + 62matches all hosts or users. A host name with a leading 63.Dq - 64will reject 65all matching hosts and all their users. 66A user name with leading 67.Dq - 68will reject all matching users from matching hosts. 69.Pp 70Items are separated by any number of blanks and/or 71tab characters. A 72.Dq # 73indicates the beginning of 74a comment; characters up to the end of the line are 75not interpreted by routines which search the file. 76.Pp 77Host names are specified in the conventional 78.Dq .\& 79(dot) notation using the 80.Xr inet_addr 3 81routine 82from the Internet address manipulation library, 83.Xr inet 3 . 84Host names may contain any printable 85character other than a field delimiter, newline, 86or comment character. 87.Pp 88For security reasons, a user's 89.Nm .rhosts 90file will be ignored if it is not a regular file, or if it 91is not owned by the user, or 92if it is writable by anyone other than the user. 93.Sh FILES 94.Bl -tag -width /etc/hosts.equivxxx -compact 95.It Pa /etc/hosts.equiv 96The 97.Nm 98file resides in 99.Pa /etc . 100.It Pa $HOME/.rhosts 101.Nm .rhosts 102file resides in 103.Pa $HOME . 104.El 105.Sh EXAMPLES 106.Dl bar.com foo 107.Pp 108Trust user 109.Dq foo 110from host 111.Dq bar.com . 112.Pp 113.Dl +@allclient 114.Pp 115Trust all hosts from netgroup 116.Dq allclient . 117.Pp 118.Dl +@allclient -@dau 119.Pp 120Trust all hosts from netgroup 121.Dq allclient 122and their users 123except users from netgroup 124.Dq dau . 125.Sh SEE ALSO 126.Xr rcp 1 Pq Pa net/bsdrcmds , 127.Xr rlogin 1 Pq Pa net/bsdrcmds , 128.Xr rsh 1 Pq Pa net/bsdrcmds , 129.Xr gethostbyname 3 , 130.Xr inet 3 , 131.Xr innetgr 3 , 132.Xr ruserok 3 , 133.Xr ifconfig 8 , 134.Xr named 8 , 135.Xr yp 8 136.Sh BUGS 137This man page is incomplete. 138For more information read 139the source in 140.Pa src/lib/libc/net/rcmd.c 141or the SunOS man page. 142