1 files changed, 13 insertions, 1 deletions

diff --git a/plugins/check_dns.c b/plugins/check_dns.c
index c30adac..b0ab23c 100644
--- a/plugins/check_dns.c
+++ b/plugins/check_dns.c
@@ -150,6 +150,10 @@ main (int argc, char **argv)
 
         /* scan stderr */
         while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr)) {
+
+                if (verbose)
+                        printf ("%s", input_buffer);
+
                 if (error_scan (input_buffer) != STATE_OK) {
                         result = max_state (result, error_scan (input_buffer));
                         output = strdup (1 + index (input_buffer, ':'));
@@ -163,7 +167,7 @@ main (int argc, char **argv)
         /* close stdout */
         if (spclose (child_process)) {
                 result = max_state (result, STATE_WARNING);
-                if (!strcmp (output, ""))
+                if (output == NULL || !strcmp (output, ""))
                         output = strdup (_("nslookup returned error status"));
         }
 
@@ -240,6 +244,14 @@ error_scan (char *input_buffer)
                   strstr (input_buffer, ": REFUSED")))
                 die (STATE_CRITICAL, _("Connection to DNS %s was refused\n"), dns_server);
 
+        /* Query refused (usually by an ACL in the namserver) */ 
+        else if (strstr (input_buffer, "Query refused"))
+                die (STATE_CRITICAL, _("Query was refused by DNS server at %s\n"), dns_server);
+
+        /* No information (e.g. nameserver IP has two PTR records) */
+        else if (strstr (input_buffer, "No information"))
+                die (STATE_CRITICAL, _("No information returned by DNS server at %s\n"), dns_server);
+
         /* Host or domain name does not exist */
         else if (strstr (input_buffer, "Non-existent") ||
                  strstr (input_buffer, "** server can't find") ||