lib-smtp: server: Record the index in the list of approved recipients…

… in the recipient object.

This avoids the need to do that in application code.

src/lib-smtp/smtp-server-transaction.c

@@ -84,6 +84,7 @@ void smtp_server_transaction_add_rcpt(struct smtp_server_transaction *trans,
 		p_array_init(&trans->rcpt_to, trans->pool, 8);
 
 	rcpt->trans = trans;
+	rcpt->index = array_count(&trans->rcpt_to);
 
 	array_append(&trans->rcpt_to, &rcpt, 1);
 }

src/lib-smtp/smtp-server.h

@@ -69,6 +69,9 @@ struct smtp_server_recipient {
 	struct smtp_address *path;
 	struct smtp_params_rcpt params;
 
+	/* The index in the list of approved recipients */
+	unsigned int index;
+
 	void *context;
 };
 ARRAY_DEFINE_TYPE(smtp_server_recipient, struct smtp_server_recipient *);