hostid revision 169860 
1#!/bin/sh
2#
3# Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
4# 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#
15# THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
16# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
19# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25# SUCH DAMAGE.
26#
27# $FreeBSD: head/etc/rc.d/hostid 169860 2007-05-22 10:22:24Z rse $
28#
29
30# PROVIDE: hostid
31# REQUIRE: root
32# BEFORE: mountcritlocal
33# KEYWORD: nojail
34
35. /etc/rc.subr
36
37name="hostid"
38start_cmd="hostid_start"
39stop_cmd=":"
40reset_cmd="hostid_reset"
41extra_commands="reset"
42rcvar="hostid_enable"
43
44hostid_set()
45{
46	uuid=$1
47	# Generate hostid based on hostuuid - take first four bytes from md5(uuid).
48	id=`echo -n $uuid | md5`
49	id="0x${id%????????????????????????}"
50	# Set both kern.hostuuid and kern.hostid.
51	echo "Setting hostuuid: ${uuid}."
52	${SYSCTL_W} kern.hostuuid="${uuid}" >/dev/null
53	echo "Setting hostid: ${id}."
54	${SYSCTL_W} kern.hostid=${id} >/dev/null
55}
56
57hostid_hardware()
58{
59	uuid=`kenv smbios.system.uuid 2>/dev/null`
60	x="[0-9a-f]"
61	y=$x$x$x$x
62	z="0000"
63	case "${uuid}" in
64	$z$z-$z-$z-$z-$z$z$z)
65		# Filter the special "Nil" UUID
66		;;
67	$y$y-$y-$y-$y-$y$y$y)
68		echo "${uuid}"
69		;;
70	esac
71}
72
73hostid_reset()
74{
75	# First look for UUID in hardware.
76	uuid=`hostid_hardware`
77	if [ -z ${uuid} ]; then
78		# If not found, fall back to software-generated UUID.
79		uuid=`uuidgen`
80	fi
81	# Store newly generated UUID in ${hostid_file}.
82	echo $uuid > ${hostid_file}
83	if [ $? -ne 0 ]; then
84		warn "could not store hostuuid in ${hostid_file}."
85	fi
86	hostid_set $uuid
87}
88
89hostid_start()
90{
91	# If ${hostid_file} already exists, we take UUID from there.
92	if [ -r ${hostid_file} ]; then
93		hostid_set `cat ${hostid_file}`
94	else
95		# No hostid file, generate UUID.
96		hostid_reset
97	fi
98}
99
100load_rc_config $name
101run_rc_command "$1"
102