#!/bin/sh
#
# Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
# Copyright (c) 2015 Xin LI <delphij@FreeBSD.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$
#
# PROVIDE: hostid
# REQUIRE: sysctl
# KEYWORD: nojail
. /etc/rc.subr
name="hostid"
desc="Generate a unique host ID"
start_cmd="hostid_start"
stop_cmd=":"
reset_cmd="hostid_reset"
extra_commands="reset"
rcvar="hostid_enable"
hostid_set()
{
uuid=$1
# Generate hostid based on hostuuid - take first four bytes from md5(uuid).
id=`echo -n $uuid | /sbin/md5`
id="0x${id%????????????????????????}"
# Set both kern.hostuuid and kern.hostid.
#
check_startmsgs && echo "Setting hostuuid: ${uuid}."
${SYSCTL} kern.hostuuid="${uuid}" >/dev/null
check_startmsgs && echo "Setting hostid: ${id}."
${SYSCTL} kern.hostid=${id} >/dev/null
}
valid_hostid()
{
uuid=$1
x="[0-9a-f]"
y=$x$x$x$x
# Check against a blacklist before
# accepting the UUID.
case "${uuid}" in
00000000-0000-0000-0000-000000000000)
;;
00020003-0004-0005-0006-000700080009)
;;
03000200-0400-0500-0006-000700080009)
;;
07090201-0103-0301-0807-060504030201)
;;
11111111-1111-1111-1111-111111111111)
;;
11111111-2222-3333-4444-555555555555)
;;
4c4c4544-0000-2010-8020-80c04f202020)
;;
58585858-5858-5858-5858-585858585858)
;;
890e2d14-cacd-45d1-ae66-bc80e8bfeb0f)
;;
8e275844-178f-44a8-aceb-a7d7e5178c63)
;;
dc698397-fa54-4cf2-82c8-b1b5307a6a7f)
;;
fefefefe-fefe-fefe-fefe-fefefefefefe)
;;
*-ffff-ffff-ffff-ffffffffffff)
;;
$y$y-$y-$y-$y-$y$y$y)
return 0
;;
esac
return 1
}
hostid_hardware()
{
uuid=`kenv -q smbios.system.uuid`
if valid_hostid $uuid; then
echo "${uuid}"
fi
}
hostid_generate()
{
# First look for UUID in hardware.
uuid=`hostid_hardware`
if [ -z "${uuid}" ]; then
warn "hostid: unable to figure out a UUID from DMI data, generating a new one"
sleep 2
# If not found, fall back to software-generated UUID.
uuid=`uuidgen`
fi
hostid_set $uuid
}
hostid_reset()
{
hostid_generate
# Store newly generated UUID in ${hostid_file}.
echo $uuid > ${hostid_file}
if [ $? -ne 0 ]; then
warn "could not store hostuuid in ${hostid_file}."
fi
}
hostid_start()
{
# If ${hostid_file} already exists, we take UUID from there.
if [ -r ${hostid_file} ]; then
read saved_hostid < ${hostid_file}
if valid_hostid ${saved_hostid}; then
hostid_set `cat ${hostid_file}`
exit 0
fi
fi
# No hostid file, generate UUID.
hostid_generate
}
load_rc_config $name
run_rc_command "$1"
