#!/bin/sh

# PROVIDE: snmpd
# REQUIRE: DAEMON
#
# Add the following line to /etc/rc.conf to enable snmpd:
#
# snmpd_enable="YES"
# snmpd_flags="<set as needed>"
# snmpd_conffile="<set as needed>"
#
# Add the following line to make snmpd run as root.  By default it drops
# privileges after initialization, but some configurations may require
# root privileges.  In particular, extension scripts may need to be run as root.
#
# snmpd_sugid="NO"
#
# To troubleshoot permission errors, it may be useful to run snmpd with the
# following option in rc.conf:
#
# snmpd_prepend="ktrace -i -f /tmp/snmpd_ktrace.out"
#
# The resulting trace can be inspected with "kdump -f /tmp/snmpd_ktrace.out".
#

. /etc/rc.subr

name=snmpd
rcvar=snmpd_enable

load_rc_config snmpd

snmpd_enable=${snmpd_enable:-"NO"}
snmpd_flush_cache=${snmpd_flush_cache-"NO"}
snmpd_sugid=${snmpd_sugid:-"YES"}

pidfile=${snmpd_pidfile:-"/var/run/net_snmpd.pid"}

command=%%PREFIX%%/sbin/${name}

start_precmd=net_snmpd_precmd

check_conffile()
{
	local conffile

	conffile=$1

	if [ ! -f "${conffile}" ]; then
		warn "snmpd configuration file $conffile not found"
		return
	fi
	su -m snmpd -c "test -r ${conffile}"
	if [ $? -ne 0 ]; then
		warn "snmpd configuration file $conffile not readable by snmpd user"
	fi
}

net_snmpd_precmd() {
	local flag conffile snmpd_conffile_set readable

	if checkyesno snmpd_flush_cache; then
		rm -vf /var/net-snmp/.snmp-exec-cache
	fi

	for flag in ${snmpd_flags}; do
		case "${flag}" in
		-p*)
			err 1 "\$snmpd_flags includes -p option." \
				"Please use \$snmpd_pidfile instead."
			;;
		-c*)
			err 1 "\$snmpd_flags includes -c option." \
				"Please use \$snmpd_conffile instead."
			;;
		esac
	done

	# -c does not override the default config file.
	# if it exists, sanity check
	if [ -f %%PREFIX%%/share/snmp/snmpd.conf ]; then
		check_conffile %%PREFIX%%/share/snmp/snmpd.conf
	fi
	for conffile in ${snmpd_conffile}; do
		check_conffile ${conffile}
		if [ -f "${conffile}" -a -s "${conffile}" ]; then
			snmpd_conffile_set="${snmpd_conffile_set},${conffile}"
		else
			err 1 "snmpd configuration file $conffile not found."
		fi
	done

	# snmpd syntax requires that the listening address (if defined) be the last argument
	if [ -n "${snmpd_conffile_set}" ]; then
		rc_flags="-c ${snmpd_conffile_set#,} ${rc_flags}"
	fi
	if checkyesno snmpd_sugid; then
		rc_flags="-u snmpd -g snmpd ${rc_flags}"
	fi

	rc_flags="-p ${pidfile} ${rc_flags}"
}

run_rc_command "$1"
