1.\" $NetBSD: rump.dhcpclient.1,v 1.3 2011/02/14 17:30:54 pooka Exp $ 2.\" 3.\" Copyright (c) 2011 Antti Kantee. All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.Dd January 20, 2011 27.Dt RUMP.DHCPCLIENT 1 28.Os 29.Sh NAME 30.Nm rump.dhcpclient 31.Nd simple dhcp client for rump kernels 32.Sh SYNOPSIS 33.Nm 34.Ar ifname 35.Sh DESCRIPTION 36The 37.Nm 38utility is a very simple DHCP client which can be used to apply 39networking configuration on one interface in a rump kernel. 40Unlike full DHCP clients, 41.Nm 42does not store leases or renew expired leases. 43The reason for this is the typical transient nature of a rump kernel. 44Additionally, 45.Nm 46does not save DNS resolver information. 47.Pp 48After having succesfully configured networking, 49.Nm 50prints out the networking configuration and lease time and exits. 51.Pp 52Since 53.Nm 54uses 55.Xr bpf 4 56to send and receive raw network packets, the server must include 57support for bpf and vfs (for opening 58.Pa /dev/bpf ) . 59Otherwise, the following diagnostic message is printed: 60.Bd -literal -offset indent 61rump.dhcpclient: bpf: Function not implemented 62.Ed 63.Sh SEE ALSO 64.Xr rump_server 1 , 65.Xr bpf 4 66.Sh CAVEATS 67There is no easy way to release a lease. 68