freebsd-dev/etc/rc.d/hostname

#!/bin/sh
#
# Copyright (c) 2003 The FreeBSD Project. 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 PROJECT 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 PROJECT 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: hostname
# REQUIRE: FILESYSTEMS
# BEFORE:  netif

. /etc/rc.subr
. /etc/network.subr

name="hostname"
start_cmd="hostname_start"
stop_cmd=":"

hostname_start()
{
	# If we are not inside a jail, set the host name if it is not already set.
	# If we are inside a jail, set the host name even if it is already set,
	# but first check if it is permitted.
	#
	if [ `$SYSCTL_N security.jail.jailed` -eq 1 ]; then
		if [ `$SYSCTL_N security.jail.set_hostname_allowed` -eq 0 ]; then
			return
		fi
	elif [ -n "`/bin/hostname -s`" ]; then
		return
	else
		# If we're not in a jail and rc.conf doesn't specify a
		# hostname, see if we can get one from kenv.
		#
		if [ -z "${hostname}" -a \
		    -n "`/bin/kenv dhcp.host-name 2> /dev/null`" ]; then
			hostname=`/bin/kenv dhcp.host-name`
		fi
	fi

	# Have we got a hostname yet?
	#
	if [ -z "${hostname}" ]; then
		# Null hostname is probably OK if DHCP is in use.
		#
		if [ -z "`list_net_interfaces dhcp`" ]; then
			warn "\$hostname is not set -- see rc.conf(5)."
		fi
		return
	fi

	# All right, it is safe to invoke hostname(1) now.
	#
	check_startmsgs && echo -n "Setting hostname: ${hostname}"
	/bin/hostname "${hostname}"
	check_startmsgs && echo '.'
}

load_rc_config $name
run_rc_command "$1"