7388 Support DHCP Client FQDN. Allow IAID/DUID for all v4.

@@ -19,10 +19,11 @@
  * CDDL HEADER END
  */
 /*
  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
+ * Copyright (c) 2016, Chris Fraire <cfraire@me.com>.
  */
 
 #pragma ident   "%Z%%M% %I%     %E% SMI"
 
 #include <stdlib.h>

@@ -104,12 +105,14 @@
         *ia = *iareq;
 
         /* We've taken ownership, so the input request is now invalid */
         ipc_action_init(iareq);
 
-        dhcpmsg(MSG_DEBUG, "ipc_action_start: started %s (command %d) on %s",
-            dhcp_ipc_type_to_string(ia->ia_cmd), ia->ia_cmd, dsmp->dsm_name);
+        dhcpmsg(MSG_DEBUG, "ipc_action_start: started %s (command %d) on %s,"
+            " buffer length %u",
+            dhcp_ipc_type_to_string(ia->ia_cmd), ia->ia_cmd, dsmp->dsm_name,
+            ia->ia_request == NULL ? 0 : ia->ia_request->data_length);
 
         dsmp->dsm_dflags |= DHCP_IF_BUSY;
 
         /* This cannot fail due to the async_cancel above */
         (void) async_start(dsmp, ia->ia_cmd, B_TRUE);