From 5ff59030f413884e11f34eb2d52988f8851b64ac Mon Sep 17 00:00:00 2001
From: Ole Tange <ole@tange.dk>
Date: Sat, 3 May 2014 20:23:22 +0200
Subject: [PATCH] w4it-for-port-open: Simplified drastically with `nc`.

---
 w4it-for-port-open/w4it-for-port-open | 32 +++++----------------------
 1 file changed, 6 insertions(+), 26 deletions(-)

diff --git a/w4it-for-port-open/w4it-for-port-open b/w4it-for-port-open/w4it-for-port-open
index 92df5ec..44db6fc 100755
--- a/w4it-for-port-open/w4it-for-port-open
+++ b/w4it-for-port-open/w4it-for-port-open
@@ -13,31 +13,12 @@ usage () {
 }
 
 print_not_reachable () {
-  if [ "$NOT_REACHABLE" = "1" ] ; then
-    echo -n .
-  else
-    echo -n $HOST:$PORT is not reachable
-    NOT_REACHABLE=1
-  fi
+  echo -n .
 }
 
-print_up_but_port_closed () {
-  if [ "$PORT_CLOSED" = "1" ] ; then
-    echo -n .
-  else
-    echo -n $HOST is up but port $PORT is closed
-    PORT_CLOSED=1
-  fi
-}
-
-port_is_open () {
-    # If tcptraceroute stops working use:
-    # echo | nc -w 2 $HOST $PORT || failed
-    if $NC -z -w 2 $HOST $PORT 2>&1 ; then
-	OPEN=no
-    else
-	OPEN=yes
-    fi
+is_port_open () {
+    $NC -z -w 2 $HOST $PORT 2>&1
+    return $?
 }
 
 if [ -z "$HOST" ] ; then
@@ -51,8 +32,7 @@ if [ -z "$NC" ] ; then
   exit 2
 fi
 
-port_is_open
-while [ "$OPEN" = "no" ] ; do
-  port_is_open
+while ! is_port_open ; do
+  print_not_reachable
 done
 echo