1#!/bin/sh
2#
3# Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
4# Copyright (c) 2015 Xin LI <delphij@FreeBSD.org>
5# All rights reserved.
6#
7# Redistribution and use in source and binary forms, with or without
8# modification, are permitted provided that the following conditions
9# are met:
10# 1. Redistributions of source code must retain the above copyright
11#    notice, this list of conditions and the following disclaimer.
12# 2. Redistributions in binary form must reproduce the above copyright
13#    notice, this list of conditions and the following disclaimer in the
14#    documentation and/or other materials provided with the distribution.
15#
16# THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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: releng/11.0/etc/rc.d/hostid 298514 2016-04-23 16:10:54Z lme $
29#
30
31# PROVIDE: hostid
32# REQUIRE: sysctl
33# KEYWORD: nojail
34
35. /etc/rc.subr
36
37name="hostid"
38desc="Generate a unique host ID"
39start_cmd="hostid_start"
40stop_cmd=":"
41reset_cmd="hostid_reset"
42extra_commands="reset"
43rcvar="hostid_enable"
44
45hostid_set()
46{
47	uuid=$1
48	# Generate hostid based on hostuuid - take first four bytes from md5(uuid).
49	id=`echo -n $uuid | /sbin/md5`
50	id="0x${id%????????????????????????}"
51
52	# Set both kern.hostuuid and kern.hostid.
53	#
54	check_startmsgs && echo "Setting hostuuid: ${uuid}."
55	${SYSCTL} kern.hostuuid="${uuid}" >/dev/null
56	check_startmsgs && echo "Setting hostid: ${id}."
57	${SYSCTL} kern.hostid=${id} >/dev/null
58}
59
60valid_hostid()
61{
62	uuid=$1
63
64	x="[0-9a-f]"
65	y=$x$x$x$x
66
67	# Check against a blacklist before
68	# accepting the UUID.
69	case "${uuid}" in
70	00000000-0000-0000-0000-000000000000)
71		;;
72	00020003-0004-0005-0006-000700080009)
73		;;
74	03000200-0400-0500-0006-000700080009)
75		;;
76	07090201-0103-0301-0807-060504030201)
77		;;
78	11111111-1111-1111-1111-111111111111)
79		;;
80	11111111-2222-3333-4444-555555555555)
81		;;
82	4c4c4544-0000-2010-8020-80c04f202020)
83		;;
84	58585858-5858-5858-5858-585858585858)
85		;;
86	890e2d14-cacd-45d1-ae66-bc80e8bfeb0f)
87		;;
88	8e275844-178f-44a8-aceb-a7d7e5178c63)
89		;;
90	dc698397-fa54-4cf2-82c8-b1b5307a6a7f)
91		;;
92	fefefefe-fefe-fefe-fefe-fefefefefefe)
93		;;
94	*-ffff-ffff-ffff-ffffffffffff)
95		;;
96	$y$y-$y-$y-$y-$y$y$y)
97		return 0
98		;;
99	esac
100
101	return 1
102}
103
104hostid_hardware()
105{
106	uuid=`kenv -q smbios.system.uuid`
107
108	if valid_hostid $uuid; then
109		echo "${uuid}"
110	fi
111}
112
113hostid_generate()
114{
115	# First look for UUID in hardware.
116	uuid=`hostid_hardware`
117	if [ -z "${uuid}" ]; then
118		warn "hostid: unable to figure out a UUID from DMI data, generating a new one"
119		sleep 2
120		# If not found, fall back to software-generated UUID.
121		uuid=`uuidgen`
122	fi
123	hostid_set $uuid
124}
125
126hostid_reset()
127{
128	hostid_generate
129	# Store newly generated UUID in ${hostid_file}.
130	echo $uuid > ${hostid_file}
131	if [ $? -ne 0 ]; then
132		warn "could not store hostuuid in ${hostid_file}."
133	fi
134}
135
136hostid_start()
137{
138	# If ${hostid_file} already exists, we take UUID from there.
139	if [ -r ${hostid_file} ]; then
140		read saved_hostid < ${hostid_file}
141		if valid_hostid ${saved_hostid}; then
142			hostid_set `cat ${hostid_file}`
143			exit 0
144		fi
145	fi
146
147	# No hostid file, generate UUID.
148	hostid_generate
149}
150
151load_rc_config $name
152run_rc_command "$1"
153