sshtunnel: ProxyCommand option

The ProxyCommand may have spaces so it must be quoted.
So we must use the procd_append_param.
Currently the option is not supported by Dropbear.
But it has -J instead which in OpenSSH means ProxyJump.
So we can't use it to avoid conflict.

Signed-off-by: Sergey Ponomarev <stokito@gmail.com>

net/sshtunnel/files/sshtunnel.init

@@ -52,7 +52,8 @@ validate_server_section() {
 		'ServerAliveInterval:min(0)' \
 		'StrictHostKeyChecking:or("yes", "no", "accept-new"):accept-new' \
 		'TCPKeepAlive:or("yes", "no")' \
-		'VerifyHostKeyDNS:or("yes", "no")'
+		'VerifyHostKeyDNS:or("yes", "no")' \
+		'ProxyCommand:string(1)'
 }
 
 validate_tunnelR_section() {
@@ -198,6 +199,9 @@ load_server() {
 
 	procd_open_instance "$server"
 	procd_set_param command "$PROG" $ARGS
+	# ProxyCommand must be quoted
+	[ -n "$ProxyCommand" ] && procd_append_param command -o "ProxyCommand=$ProxyCommand"
+
 	procd_set_param stdout 1
 	procd_set_param stderr 1
 	procd_set_param respawn 0 "$retrydelay" 1