1 files changed, 16 insertions, 5 deletions

diff --git a/plugins/check_dns.c b/plugins/check_dns.c
index 2765f64..f1071d8 100644
--- a/plugins/check_dns.c
+++ b/plugins/check_dns.c
@@ -139,12 +139,16 @@ main (int argc, char **argv)
                                 /* Strip leading spaces */
                                 for (; *temp_buffer != '\0' && *temp_buffer == ' '; temp_buffer++)
                                         /* NOOP */;
-                                address = strscpy (address, temp_buffer);
+                                address = strdup (temp_buffer);
                                 strip (address);
+                                if (address==NULL || strlen(address)==0)
+                                        terminate (STATE_CRITICAL,
+                                                   "DNS CRITICAL - '%s' returned empty host name string\n",
+                                                   NSLOOKUP_COMMAND);
                                 result = STATE_OK;
                         }
                         else {
-                                output = strscpy (output, "Unknown error (plugin)");
+                                output = strdup ("Unknown error (plugin)");
                                 result = STATE_WARNING;
                         }
 
@@ -179,11 +183,18 @@ main (int argc, char **argv)
                         output = strscpy (output, "nslookup returned error status");
         }
 
+        /* If we got here, we should have an address string, 
+           and we can segfault if we do not */
+        if (address==NULL || strlen(address)==0)
+                terminate (STATE_CRITICAL,
+                           "DNS CRITICAL - '%s' output parsing exited with no address\n",
+                           NSLOOKUP_COMMAND);
+
         /* compare to expected address */
         if (result == STATE_OK && match_expected_address && strcmp(address, expected_address)) {
-                result = STATE_CRITICAL;
-                asprintf(&output, "expected %s but got %s", expected_address, address);
-                }
+                result = STATE_CRITICAL;
+                asprintf(&output, "expected %s but got %s", expected_address, address);
+        }
         
         elapsed_time = delta_time (tv);