mail/emailrelay: tune up initscript and config

Previously, configuration of emailrelay was done by fiddling around
with the commandline inside the initscript. Introduce a config file
in /etc/config for basic configuration and at the same time switch
to a procd-style initscript.

Signed-off-by: Paul Wassi <p.wassi@gmx.at>

mail/emailrelay/files/emailrelay.init

@@ -1,15 +1,66 @@
 #!/bin/sh /etc/rc.common
-#see http://emailrelay.sourceforge.net/reference.html for command line reference
 
 START=90
 
+USE_PROCD=1
+PROG=/usr/bin/emailrelay
+NAME=emailrelay
 
-start() {
-        logger -t 'emailrelay' "Starting emailrelay service."
-        service_start /usr/bin/emailrelay --as-server --poll 60 --forward-to smtpserver:smtpport --spool-dir /tmp --client-tls --client-auth /etc/emailrelay.auth --server-auth /etc/emailrelay.auth --log
+
+emailrelay_instance()
+{
+	local enabled mode port remote_clients server_tls server_auth extra_cmdline smarthost client_tls client_auth
+
+	config_get_bool enabled "$1" enabled
+	config_get mode "$1" mode
+	config_get port "$1" port
+	config_get_bool remote_clients "$1" remote_clients
+	config_get server_tls "$1" server_tls
+	config_get server_auth "$1" server_auth
+	config_get extra_cmdline "$1" extra_cmdline
+	config_get smarthost "$1" smarthost
+	config_get_bool client_tls "$1" client_tls
+	config_get client_auth "$1" client_auth
+
+
+	[ "$enabled" = 0 ] && return 1
+
+	procd_open_instance
+	procd_set_param command "$PROG" --no-daemon
+
+	case "$mode" in
+		"server"|\
+		"proxy")
+			procd_append_param command "--as-${mode}"
+			[ -n "$smarthost" ] && procd_append_param command "$smarthost"
+			[ -n "$port" ] && procd_append_param command --port "$port"
+			[ "$remote_clients" = 1 ] && procd_append_param command --remote-clients
+			[ -n "$server_tls" ] && procd_append_param command --server-tls "$server_tls"
+			[ -n "$server_auth" ] && procd_append_param command --server-auth "$server_auth"
+			[ "$client_tls" = 1 ] && procd_append_param command --client-tls
+			[ -n "$client_auth" ] && procd_append_param command --client-auth "$client_auth"
+			;;
+		"cmdline")
+			# empty by intention (just append extra_cmdline)
+			;;
+		*)
+			echo "no mode specified"
+			return 1
+			;;
+	esac
+
+	[ -n "$extra_cmdline" ] && procd_append_param command $extra_cmdline
+
+	procd_set_param respawn
+
+	procd_close_instance
 }
 
-stop() {
-        logger -t 'emailrelay' "Stopping emailrelay service."
-        service_stop /usr/bin/emailrelay
+
+start_service()
+{
+	[ ! -d /var/spool/emailrelay ] && mkdir -p /var/spool/emailrelay
+
+	config_load "${NAME}"
+	config_foreach emailrelay_instance emailrelay
 }