Add error handling if the connection to the remote server errors out (e.g. refused or timed out connections).

get_cert_info.js

@@ -50,10 +50,69 @@ function get_cert_parameters(element, index, array) {
         'valid_to': parse_date(cert.valid_to),
         'days_left': get_days_left(cert.valid_to)
       }
-    }
+    };
     add_cert_details(parsed, iteration);
     check_iterations();
   });
+
+  // Abort the request when a timeout event is emitted
+  req.on('timeout',  function () {
+    this.abort();
+  });
+
+  // Handle errors generated by failed requests
+  req.on('error', function(e) {
+    // Increment the error count for the final output
+    errors++;
+
+    if (e.code ==='ECONNREFUSED') {
+      // The connection was refused by the server (ex. 443 not open, not resonding, etc.)
+      assert(false, 'Connection to '+element+' refused')
+      var parsed = {
+        'server': element,
+        'subject': {
+          'org': 'Unknown',
+          'common_name': 'Unknown',
+          'sans': 'Unknown'
+        }, 
+        'issuer': {
+          'org': 'Unknown',
+          'common_name': 'Last check connection refused'
+        },
+        'info': {
+          'days_left': '??'
+        }
+      };
+      add_cert_details(parsed, iteration);
+      check_iterations();
+
+    } else if (e.code ==='ECONNRESET') {
+      // The connection to the server timed out
+      assert(false, 'Connection to '+element+' timed out')
+      var parsed = {
+        'server': element,
+        'subject': {
+          'org': 'Unknown',
+          'common_name': 'Unknown',
+          'sans': 'Unknown'
+        }, 
+        'issuer': {
+          'org': 'Unknown',
+          'common_name': 'Last check timed out'
+        },
+        'info': {
+          'days_left': '??'
+        }
+      };
+      add_cert_details(parsed, iteration);
+      check_iterations();
+    }
+  })
+
+  // Set the timeout threshold for the https connection. Set in config.js, default 5000ms
+  req.setTimeout(config.connection_timeout);
+  
+  // End the request
   req.end();
 };
 
@@ -95,8 +154,8 @@ function add_cert_details(object, host) {
  */
 function check_iterations() {
   if (iteration === monitored_hosts.length) {
+    assert(true, 'Scanned '+iteration+' of '+monitored_hosts.length+' urls, with '+errors+' errors');
     write_results();
-    assert(true, iteration+' of '+host_list.length+' urls complete.');
   } else {
     iteration++;
   }