path: root/etc/rc.d/rc.subr

#	$OpenBSD: rc.subr,v 1.141 2021/11/07 08:26:12 ajacoutot Exp $
#
# Copyright (c) 2010, 2011, 2014-2021 Antoine Jacoutot <ajacoutot@openbsd.org>
# Copyright (c) 2010, 2011 Ingo Schwarze <schwarze@openbsd.org>
# Copyright (c) 2010, 2011, 2014 Robert Nagy <robert@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

_rc_actions="start stop restart reload check"
readonly _rc_actions

_rc_check_name() {
	[[ $1 == +([_[:alpha:]])+(|[_[:alnum:]]) ]]
}

_rc_do() {
	if [ -n "${_RC_DEBUG}" ]; then
		echo "doing $@" && "$@"
	else
		"$@" >/dev/null 2>&1
	fi
}

_rc_err() {
	[ -n "${1}" ] && echo "${1}" 1>&2
	[ -n "${2}" ] && exit "${2}" || exit 1
}

_rc_parse_conf() {
	typeset -l _key
	local _l _rcfile _val
	set -A _allowed_keys -- \
		accounting amd_master check_quotas ipsec library_aslr \
		multicast nfs_server pexp pf pkg_scripts shlib_dirs \
		rc_reload_signal rc_stop_signal spamd_black

	[ $# -gt 0 ] || set -- /etc/rc.conf /etc/rc.conf.local
	for _rcfile; do
		[[ -f $_rcfile ]] || continue
		while IFS=' 	' read -r _l; do
			[[ $_l == [!#=]*=* ]] || continue
			_key=${_l%%*([[:blank:]])=*}
			[[ $_key == *_@(flags|logger|rtable|timeout|user) ]] ||
				[[ " ${_allowed_keys[*]} " == *" $_key "* ]] ||
				continue
			[[ $_key == "" ]] && continue
			_val=${_l##*([!=])=*([[:blank:]])}
			_val=${_val%%#*}
			_val=${_val%%*([[:blank:]])}
			# remove leading and trailing quotes (backwards compat)
			[[ $_val == @(\"*\"|\'*\') ]] &&
				_val=${_val#?} _val=${_val%?}
			eval "${_key}=\${_val}"
		done < $_rcfile
	done

	_rc_do _rc_quirks
}

_rc_quirks() {
	# special care needed for spamlogd to avoid starting it up and failing
	# all the time
	if [ X"${spamd_flags}" = X"NO" -o X"${spamd_black}" != X"NO" ]; then
		spamlogd_flags=NO
	fi

	# special care needed for pflogd to avoid starting it up and failing
	# if pf is not enabled
	if [ X"${pf}" = X"NO" ]; then
		pflogd_flags=NO
	fi

	# special care needed if nfs_server=YES to startup nfsd and mountd with
	# sane default flags
	if [ X"${nfs_server}" = X"YES" ]; then
		[ X"${nfsd_flags}" = X"NO" ] && nfsd_flags="-tun 4"
		[ X"${mountd_flags}" = X"NO" ] && mountd_flags=
	fi
}

# return if we only want internal functions
[ -n "${FUNCS_ONLY}" ] && return

_rc_not_supported() {
	local _a _enotsup _what=${1}
	for _a in ${_rc_actions}; do
		[ "${_what}" == "restart" ] && _what="stop"
		if [ "${_what}" == "${_a}" ]; then
			eval _enotsup=\${rc_${_what}}
			break
		fi
	done
	[ X"${_enotsup}" == X"NO" ]
}

_rc_usage() {
	local _a _allsup
	for _a in ${_rc_actions}; do
		_rc_not_supported ${_a} || _allsup="${_allsup:+$_allsup|}${_a}"
	done
	_rc_err "usage: $0 [-df] ${_allsup}"
}

_rc_write_runfile() {
	[ -d ${_RC_RUNDIR} ] || mkdir -p ${_RC_RUNDIR} &&
		cat >${_RC_RUNFILE} <<EOF
daemon_class=${daemon_class}
daemon_flags=${daemon_flags}
daemon_logger=${daemon_logger}
daemon_rtable=${daemon_rtable}
daemon_timeout=${daemon_timeout}
daemon_user=${daemon_user}
pexp=${pexp}
rc_reload_signal=${rc_reload_signal}
rc_stop_signal=${rc_stop_signal}
EOF
}

_rc_rm_runfile() {
	rm -f ${_RC_RUNFILE}
}

_rc_exit() {
	local _pfix
	[ -z "${INRC}" -o X"$1" != X"ok" ] && _pfix="($1)"
	echo ${INRC:+'-n'} "${_pfix}"
	[ X"$1" = X"ok" ] && exit 0 || exit 1
}

_rc_alarm()
{
	trap - ALRM
	kill -ALRM ${_TIMERSUB} 2>/dev/null # timer may not be running anymore
	kill $! 2>/dev/null # kill last job if it's running
}

_rc_sendsig() {
	pkill -${1:-TERM} -T "${daemon_rtable}" -xf "${pexp}" 
}

_rc_wait() {
	if [ X"$1" = X"start" ]; then # prevent hanging the boot sequence
		trap "_rc_alarm" ALRM
		while (( SECONDS < daemon_timeout )); do
			if _rc_do rc_check; then
				[ X"${rc_bg}" = X"YES" ] || [ -z "$$" ] && break
			fi
			sleep 1
		done & wait
		pkill -ALRM -P $$
		return
	fi
	while (( SECONDS < daemon_timeout )); do
		case "$1" in
		reload)
			_rc_do rc_check && return 0 ;;
		stop)
			# last chance: send a SIGTERM first in case the process
			# used another signal to stop (e.g. SIGQUIT with nginx)
			# or a non-default rc_stop() function; do it 2s before
			# timeout to re-enter the loop one last time which will
			# give 1s for SIGTERM to terminate the process
			((SECONDS == daemon_timeout-2)) && _rc_do _rc_sendsig TERM
			_rc_do rc_check || return 0 ;;
		*)
			break ;;
		esac
		sleep 1
	done

	# KILL the process
	[ X"$1" = X"stop" ] && _rc_do rc_check && _rc_do _rc_sendsig KILL

	return 1
}

rc_start() {
	${rcexec} "${daemon_logger:+set -o pipefail; }${daemon} ${daemon_flags}${daemon_logger:+ 2>&1 |
		logger -ip ${daemon_logger} -t ${_name}}"
}

rc_check() {
	pgrep -T "${daemon_rtable}" -q -xf "${pexp}"
}

rc_reload() {
	_rc_sendsig ${rc_reload_signal}
}

rc_stop() {
	_rc_sendsig ${rc_stop_signal}
}

rc_cmd() {
	local _exit _n _ret

	[ -n "${1}" ] && echo "${_rc_actions}" | grep -qw -- ${1} || _rc_usage

	[ "$(id -u)" -eq 0 ] ||
		[ X"${rc_usercheck}" != X"NO" -a X"$1" = "Xcheck" ] ||
		_rc_err "$0: need root privileges"

	if _rc_not_supported $1; then
		[ -n "${INRC}" ] && exit 1
		_rc_err "$0: $1 is not supported"
	fi

	[ -n "${_RC_DEBUG}" ] || _n="-n"

	[[ ${1} == start ]] || _rc_do _rc_parse_conf ${_RC_RUNFILE}

	case "$1" in
	check)
		echo $_n "${INRC:+ }${_name}"
		_rc_do rc_check && _rc_exit ok
		_rc_exit failed
		;;
	start)
		if [ X"${daemon_flags}" = X"NO" ]; then
			_rc_err "$0: need -f to force $1 since ${_name}_flags=NO"
		fi
		[ -z "${INRC}" ] && _rc_do rc_check && exit 0
		echo $_n "${INRC:+ }${_name}"
		while true; do # no real loop, only needed to break
			if type rc_pre >/dev/null; then
				_rc_do rc_pre || break
			fi
			_rc_do _rc_wait start & _TIMERSUB=$!
			trap "_rc_alarm" ALRM
			_rc_do rc_start; _ret=$?
			kill -ALRM ${_TIMERSUB}
			wait ${_TIMERSUB} 2>/dev/null # don't print Alarm clock
			[[ "${_ret}" == 142 ]] && [ X"${rc_bg}" != X"YES" ] &&
				_exit="timeout"
			# XXX for unknown reason, rc_check can fail (e.g. redis)
			# while it just succeeded in _rc_wait; the check is
			# needed to cope with failing daemons returning 0
			#[[ "${_ret}" == @(0|142) ]] && _rc_do rc_check || break
			[[ "${_ret}" == @(0|142) ]] || break
			_rc_do _rc_write_runfile
			_rc_exit ${_exit:=ok}
		done
		# handle failure
		type rc_post >/dev/null && _rc_do rc_post
		_rc_do _rc_rm_runfile
		_rc_exit failed
		;;
	stop)
		_rc_do rc_check || exit 0
		echo $_n "${INRC:+ }${_name}"
		_rc_do rc_stop || _rc_exit failed
		_rc_do _rc_wait stop || _exit=killed
		if type rc_post >/dev/null; then
			_rc_do rc_post || _exit=failed
		fi
		_rc_do _rc_rm_runfile
		_rc_exit ${_exit:=ok}
		;;
	reload)
		echo $_n "${INRC:+ }${_name}"
		_rc_do rc_check && _rc_do rc_reload || _rc_exit failed
		_rc_do _rc_wait reload || _rc_exit failed
		_rc_exit ok
		;;
	restart)
		$0 ${_RC_DEBUG} ${_RC_FORCE} stop &&
			$0 ${_RC_DEBUG} ${_RC_FORCE} start
		;;
	*)
		_rc_usage
		;;
	esac
}

_name=${0##*/}
_rc_check_name "${_name}" || _rc_err "invalid rc.d script name: ${_name}"

[ -n "${daemon}" ] || _rc_err "$0: daemon is not set"

unset _RC_DEBUG _RC_FORCE
while getopts "df" c; do
	case "$c" in
		d) _RC_DEBUG=-d;;
		f) _RC_FORCE=-f;;
		*) _rc_usage;;
	esac
done
shift $((OPTIND-1))

_RC_RUNDIR=/var/run/rc.d
_RC_RUNFILE=${_RC_RUNDIR}/${_name}

# parse /etc/rc.conf{.local} for the daemon variables
_rc_do _rc_parse_conf

rc_reload_signal=${rc_reload_signal:=HUP}
rc_stop_signal=${rc_stop_signal:=TERM}

eval _rcflags=\${${_name}_flags}
eval _rclogger=\${${_name}_logger}
eval _rcrtable=\${${_name}_rtable}
eval _rctimeout=\${${_name}_timeout}
eval _rcuser=\${${_name}_user}

# set default values; duplicated in rcctl(8)
getcap -f /etc/login.conf ${_name} 1>/dev/null 2>&1 && daemon_class=${_name} ||
	daemon_class=daemon
[ -z "${daemon_rtable}" ] && daemon_rtable=0
[ -z "${daemon_timeout}" ] && daemon_timeout=30
[ -z "${daemon_user}" ] && daemon_user=root

# use flags from the rc.d script if daemon is not enabled
[ -n "${_RC_FORCE}" -o "$1" != "start" ] && [ X"${_rcflags}" = X"NO" ] &&
	unset _rcflags

[ -n "${_rcflags}" ] && daemon_flags=${_rcflags}
[ -n "${_rclogger}" ] && daemon_logger=${_rclogger}
[ -n "${_rcrtable}" ] && daemon_rtable=${_rcrtable}
[ -n "${_rctimeout}" ] && daemon_timeout=${_rctimeout}
[ -n "${_rcuser}" ] && daemon_user=${_rcuser}

if [ -n "${_RC_DEBUG}" ]; then
	echo -n "${_name}_flags "
	[ -n "${_rcflags}" ] || echo -n "empty, using default "
	echo ">${daemon_flags}<"
fi

readonly daemon_class
unset _rcflags _rclogger _rcrtable _rctimeout _rcuser
# the shell will strip the quotes from daemon_flags when starting a daemon;
# make sure pexp matches the process (i.e. doesn't include the quotes)
pexp="$(eval echo ${daemon}${daemon_flags:+ ${daemon_flags}})"
rcexec="su -fl -c ${daemon_class} -s /bin/sh ${daemon_user} -c"
[ "${daemon_rtable}" -eq "$(id -R)" ] ||
	rcexec="route -T ${daemon_rtable} exec ${rcexec}"