From 7b0becc5365373eb2004cd89f9e82fae0298c7fa Mon Sep 17 00:00:00 2001
From: abobrov <abobrov@localhost>
Date: Wed, 13 Feb 2008 13:23:54 +0000
Subject: [PATCH] - [Issue 2877] : Issue with creation of connection handler: refactor "address in use" test from connection handled implementations into a standalone isAddressInUse() StaticUtils method. invoke isAddressInUse() when validating connection handler config and connection handler initialization, both LDAP and JMX.
---
opends/src/server/org/opends/server/util/StaticUtils.java | 80 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 80 insertions(+), 0 deletions(-)
diff --git a/opends/src/server/org/opends/server/util/StaticUtils.java b/opends/src/server/org/opends/server/util/StaticUtils.java
index d48716f..3be3a1c 100644
--- a/opends/src/server/org/opends/server/util/StaticUtils.java
+++ b/opends/src/server/org/opends/server/util/StaticUtils.java
@@ -40,6 +40,10 @@
import java.io.InputStreamReader;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
import java.nio.ByteBuffer;
import java.text.ParseException;
import java.text.SimpleDateFormat;
@@ -2624,6 +2628,82 @@
/**
+ * Indicates whether the provided TCP address is already in use.
+ *
+ * @param address IP address of the TCP address for which to make
+ * the determination.
+ * @param port TCP port number of the TCP address for which to
+ * make the determination.
+ * @param allowReuse Whether or not TCP address reuse is allowed when
+ * making the determination.
+ *
+ * @return <CODE>true</CODE> if the provided TCP address is already in
+ * use, or <CODE>false</CODE> otherwise.
+ */
+ public static boolean isAddressInUse(
+ InetAddress address, int port,
+ boolean allowReuse)
+ {
+ // Return pessimistic.
+ boolean isInUse = true;
+ Socket clientSocket = null;
+ ServerSocket serverSocket = null;
+ try {
+ // HACK:
+ // With dual stacks we can have a situation when INADDR_ANY/PORT
+ // is bound in TCP4 space but available in TCP6 space and since
+ // JavaServerSocket implemantation will always use TCP46 on dual
+ // stacks the bind below will always succeed in such cases thus
+ // shadowing anything that is already bound to INADDR_ANY/PORT.
+ // While technically correct, with IPv4 and IPv6 being separate
+ // address spaces, it presents a problem to end users because a
+ // common case scenario is to have a single service serving both
+ // address spaces ie listening to the same port in both spaces
+ // on wildcard addresses 0 and ::. ServerSocket implemantation
+ // does not provide any means of working with each address space
+ // separately such as doing TCP4 or TCP6 only binds thus we have
+ // to do a dummy connect to INADDR_ANY/PORT to check if it is
+ // bound to something already. This is only needed for wildcard
+ // addresses as specific IPv4 or IPv6 addresses will always be
+ // handled in their respective address space.
+ if (address.isAnyLocalAddress()) {
+ clientSocket = new Socket();
+ try {
+ // This might fail on some stacks but this is the best we
+ // can do. No need for explicit timeout since it is local
+ // address and we have to know for sure unless it fails.
+ clientSocket.connect(new InetSocketAddress(address, port));
+ } catch (IOException e) {
+ // Expected, ignore.
+ }
+ if (clientSocket.isConnected()) {
+ isInUse = true;
+ }
+ }
+ serverSocket = new ServerSocket();
+ serverSocket.setReuseAddress(allowReuse);
+ serverSocket.bind(new InetSocketAddress(address, port));
+ isInUse = false;
+ } catch (IOException e) {
+ isInUse = true;
+ } finally {
+ try {
+ if (serverSocket != null) {
+ serverSocket.close();
+ }
+ } catch (Exception e) {}
+ try {
+ if (clientSocket != null) {
+ clientSocket.close();
+ }
+ } catch (Exception e) {}
+ }
+ return isInUse;
+ }
+
+
+
+ /**
* Retrieves a lowercase representation of the given string. This
* implementation presumes that the provided string will contain only ASCII
* characters and is optimized for that case. However, if a non-ASCII
--
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