added command for pfctl and flag for lauching hostchecker

hostchecker.go

@@ -12,6 +12,8 @@ import "os/signal"
 import "os"
 import "errors"
 import "net"
+import "os/exec"
+import "flag"
 
 type Check struct {
 	Type     string `yaml:"type"`
@@ -34,10 +36,13 @@ type Group struct {
 func main() {
 	log.Println("Starting")
 
+  confFileName := flag.String("f", "/usr/local/etc/hostchecker.yaml", "YAML configuration file")
+  flag.Parse()
+
 	var waitGroup sync.WaitGroup
 
 	var conf map[string]Group
-	yamlFile, err := ioutil.ReadFile("conf.yaml")
+	yamlFile, err := ioutil.ReadFile(*confFileName)
 	if err != nil {
 		log.Fatalf("Configuration open error #%v ", err)
 	}
@@ -92,11 +97,7 @@ func checkGroup(name string, group Group, waitGroup *sync.WaitGroup, stopChannel
 					break
 				case status := <-channel:
 					log.Println("Status for ", host, "is", status, "in group", name)
-          if status == 0 {
-            addHostToTables( host, group.Tables )
-          } else {
-            removeHostFromTables( host, group.Tables)
-          }
+            updateTables( host, status, group.Tables )
 				default:
 					time.Sleep(100 * time.Millisecond)
 				}
@@ -105,10 +106,20 @@ func checkGroup(name string, group Group, waitGroup *sync.WaitGroup, stopChannel
 	}
 }
 
-func addHostToTables( host string, tables []string ) {
+func updateTables( host string, status int, tables []string ) {
+  for _, table := range tables {
+    op := "add"
+    if status != 0 {
+      op = "del"
     }
-func removeHostFromTables( host string, tables []string ) {
+    cmd := exec.Command("pfctl", "-t", table, "-T", op, host)
+    err := cmd.Run()
+    if err != nil {
+      log.Println("Unable to run command #", cmd)
     }
+  }
+}
+
 func checkHost(status chan<- int, group string, host string, check Check, waitGroup *sync.WaitGroup, stopChannel chan bool) {
 
   var lastCheck time.Time