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-rw-r--r--lib/jinterface/java_src/com/ericsson/otp/erlang/OtpEpmd.java641
1 files changed, 326 insertions, 315 deletions
diff --git a/lib/jinterface/java_src/com/ericsson/otp/erlang/OtpEpmd.java b/lib/jinterface/java_src/com/ericsson/otp/erlang/OtpEpmd.java
index 1868dc7740..363fdb950a 100644
--- a/lib/jinterface/java_src/com/ericsson/otp/erlang/OtpEpmd.java
+++ b/lib/jinterface/java_src/com/ericsson/otp/erlang/OtpEpmd.java
@@ -1,19 +1,20 @@
/*
* %CopyrightBegin%
- *
- * Copyright Ericsson AB 2000-2013. All Rights Reserved.
- *
- * The contents of this file are subject to the Erlang Public License,
- * Version 1.1, (the "License"); you may not use this file except in
- * compliance with the License. You should have received a copy of the
- * Erlang Public License along with this software. If not, it can be
- * retrieved online at http://www.erlang.org/.
- *
- * Software distributed under the License is distributed on an "AS IS"
- * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
- * the License for the specific language governing rights and limitations
- * under the License.
- *
+ *
+ * Copyright Ericsson AB 2000-2016. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
* %CopyrightEnd%
*/
package com.ericsson.otp.erlang;
@@ -21,20 +22,19 @@ package com.ericsson.otp.erlang;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.InetAddress;
-import java.net.Socket;
/**
* Provides methods for registering, unregistering and looking up nodes with the
* Erlang portmapper daemon (Epmd). For each registered node, Epmd maintains
* information about the port on which incoming connections are accepted, as
- * well as which versions of the Erlang communication protocolt the node
+ * well as which versions of the Erlang communication protocol the node
* supports.
- *
+ *
* <p>
* Nodes wishing to contact other nodes must first request information from Epmd
* before a connection can be set up, however this is done automatically by
* {@link OtpSelf#connect(OtpPeer) OtpSelf.connect()} when necessary.
- *
+ *
* <p>
* The methods {@link #publishPort(OtpLocalNode) publishPort()} and
* {@link #unPublishPort(OtpLocalNode) unPublishPort()} will fail if an Epmd
@@ -42,32 +42,33 @@ import java.net.Socket;
* {@link #lookupPort(AbstractNode) lookupPort()} will fail if there is no Epmd
* process running on the host where the specified node is running. See the
* Erlang documentation for information about starting Epmd.
- *
+ *
* <p>
* This class contains only static methods, there are no constructors.
*/
public class OtpEpmd {
private static class EpmdPort {
- private static int epmdPort = 0;
-
- public static int get() {
- if (epmdPort == 0) {
- String env;
- try {
- env = System.getenv("ERL_EPMD_PORT");
- }
- catch (java.lang.SecurityException e) {
- env = null;
- }
- epmdPort = (env != null) ? Integer.parseInt(env) : 4369;
- }
- return epmdPort;
- }
- public static void set(int port) {
- epmdPort = port;
- }
+ private static int epmdPort = 0;
+
+ public static int get() {
+ if (epmdPort == 0) {
+ String env;
+ try {
+ env = System.getenv("ERL_EPMD_PORT");
+ } catch (final java.lang.SecurityException e) {
+ env = null;
+ }
+ epmdPort = env != null ? Integer.parseInt(env) : 4369;
+ }
+ return epmdPort;
+ }
+
+ public static void set(final int port) {
+ epmdPort = port;
+ }
}
+
// common values
private static final byte stopReq = (byte) 115;
@@ -81,16 +82,16 @@ public class OtpEpmd {
private static final int traceThreshold = 4;
static {
- // debug this connection?
- final String trace = System.getProperties().getProperty(
- "OtpConnection.trace");
- try {
- if (trace != null) {
- traceLevel = Integer.valueOf(trace).intValue();
- }
- } catch (final NumberFormatException e) {
- traceLevel = 0;
- }
+ // debug this connection?
+ final String trace = System.getProperties().getProperty(
+ "OtpConnection.trace");
+ try {
+ if (trace != null) {
+ traceLevel = Integer.valueOf(trace).intValue();
+ }
+ } catch (final NumberFormatException e) {
+ traceLevel = 0;
+ }
}
// only static methods: no public constructors
@@ -98,51 +99,50 @@ public class OtpEpmd {
private OtpEpmd() {
}
-
/**
- * Set the port number to be used to contact the epmd process.
- * Only needed when the default port is not desired and system environment
- * variable ERL_EPMD_PORT can not be read (applet).
+ * Set the port number to be used to contact the epmd process. Only needed
+ * when the default port is not desired and system environment variable
+ * ERL_EPMD_PORT can not be read (applet).
*/
- public static void useEpmdPort(int port) {
- EpmdPort.set(port);
+ public static void useEpmdPort(final int port) {
+ EpmdPort.set(port);
}
/**
* Determine what port a node listens for incoming connections on.
- *
+ *
* @return the listen port for the specified node, or 0 if the node was not
* registered with Epmd.
- *
+ *
* @exception java.io.IOException
* if there was no response from the name server.
*/
public static int lookupPort(final AbstractNode node) throws IOException {
- return r4_lookupPort(node);
+ return r4_lookupPort(node);
}
/**
* Register with Epmd, so that other nodes are able to find and connect to
* it.
- *
+ *
* @param node
* the server node that should be registered with Epmd.
- *
+ *
* @return true if the operation was successful. False if the node was
* already registered.
- *
+ *
* @exception java.io.IOException
* if there was no response from the name server.
*/
public static boolean publishPort(final OtpLocalNode node)
- throws IOException {
- Socket s = null;
+ throws IOException {
+ OtpTransport s = null;
- s = r4_publish(node);
+ s = r4_publish(node);
- node.setEpmd(s);
+ node.setEpmd(s);
- return s != null;
+ return s != null;
}
// Ask epmd to close his end of the connection.
@@ -151,274 +151,285 @@ public class OtpEpmd {
/**
* Unregister from Epmd. Other nodes wishing to connect will no longer be
* able to.
- *
+ *
* <p>
* This method does not report any failures.
*/
public static void unPublishPort(final OtpLocalNode node) {
- Socket s = null;
-
- try {
- s = new Socket((String) null, EpmdPort.get());
- final OtpOutputStream obuf = new OtpOutputStream();
- obuf.write2BE(node.alive().length() + 1);
- obuf.write1(stopReq);
- obuf.writeN(node.alive().getBytes());
- obuf.writeTo(s.getOutputStream());
- // don't even wait for a response (is there one?)
- if (traceLevel >= traceThreshold) {
- System.out.println("-> UNPUBLISH " + node + " port="
- + node.port());
- System.out.println("<- OK (assumed)");
- }
- } catch (final Exception e) {/* ignore all failures */
- } finally {
- try {
- if (s != null) {
- s.close();
- }
- } catch (final IOException e) { /* ignore close failure */
- }
- s = null;
- }
+ OtpTransport s = null;
+
+ try {
+ s = node.createTransport((String) null, EpmdPort.get());
+ @SuppressWarnings("resource")
+ final OtpOutputStream obuf = new OtpOutputStream();
+ obuf.write2BE(node.alive().length() + 1);
+ obuf.write1(stopReq);
+ obuf.writeN(node.alive().getBytes());
+ obuf.writeToAndFlush(s.getOutputStream());
+ // don't even wait for a response (is there one?)
+ if (traceLevel >= traceThreshold) {
+ System.out.println("-> UNPUBLISH " + node + " port="
+ + node.port());
+ System.out.println("<- OK (assumed)");
+ }
+ } catch (final Exception e) {/* ignore all failures */
+ } finally {
+ try {
+ if (s != null) {
+ s.close();
+ }
+ } catch (final IOException e) { /* ignore close failure */
+ }
+ s = null;
+ }
}
private static int r4_lookupPort(final AbstractNode node)
- throws IOException {
- int port = 0;
- Socket s = null;
-
- try {
- final OtpOutputStream obuf = new OtpOutputStream();
- s = new Socket(node.host(), EpmdPort.get());
-
- // build and send epmd request
- // length[2], tag[1], alivename[n] (length = n+1)
- obuf.write2BE(node.alive().length() + 1);
- obuf.write1(port4req);
- obuf.writeN(node.alive().getBytes());
-
- // send request
- obuf.writeTo(s.getOutputStream());
-
- if (traceLevel >= traceThreshold) {
- System.out.println("-> LOOKUP (r4) " + node);
- }
-
- // receive and decode reply
- // resptag[1], result[1], port[2], ntype[1], proto[1],
- // disthigh[2], distlow[2], nlen[2], alivename[n],
- // elen[2], edata[m]
- final byte[] tmpbuf = new byte[100];
-
- final int n = s.getInputStream().read(tmpbuf);
-
- if (n < 0) {
- s.close();
- throw new IOException("Nameserver not responding on "
- + node.host() + " when looking up " + node.alive());
- }
-
- final OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
-
- final int response = ibuf.read1();
- if (response == port4resp) {
- final int result = ibuf.read1();
- if (result == 0) {
- port = ibuf.read2BE();
-
- node.ntype = ibuf.read1();
- node.proto = ibuf.read1();
- node.distHigh = ibuf.read2BE();
- node.distLow = ibuf.read2BE();
- // ignore rest of fields
- }
- }
- } catch (final IOException e) {
- if (traceLevel >= traceThreshold) {
- System.out.println("<- (no response)");
- }
- throw new IOException("Nameserver not responding on " + node.host()
- + " when looking up " + node.alive());
- } catch (final OtpErlangDecodeException e) {
- if (traceLevel >= traceThreshold) {
- System.out.println("<- (invalid response)");
- }
- throw new IOException("Nameserver not responding on " + node.host()
- + " when looking up " + node.alive());
- } finally {
- try {
- if (s != null) {
- s.close();
- }
- } catch (final IOException e) { /* ignore close errors */
- }
- s = null;
- }
-
- if (traceLevel >= traceThreshold) {
- if (port == 0) {
- System.out.println("<- NOT FOUND");
- } else {
- System.out.println("<- PORT " + port);
- }
- }
- return port;
+ throws IOException {
+ int port = 0;
+ OtpTransport s = null;
+
+ try {
+ @SuppressWarnings("resource")
+ final OtpOutputStream obuf = new OtpOutputStream();
+ s = node.createTransport(node.host(), EpmdPort.get());
+
+ // build and send epmd request
+ // length[2], tag[1], alivename[n] (length = n+1)
+ obuf.write2BE(node.alive().length() + 1);
+ obuf.write1(port4req);
+ obuf.writeN(node.alive().getBytes());
+
+ // send request
+ obuf.writeToAndFlush(s.getOutputStream());
+
+ if (traceLevel >= traceThreshold) {
+ System.out.println("-> LOOKUP (r4) " + node);
+ }
+
+ // receive and decode reply
+ // resptag[1], result[1], port[2], ntype[1], proto[1],
+ // disthigh[2], distlow[2], nlen[2], alivename[n],
+ // elen[2], edata[m]
+ final byte[] tmpbuf = new byte[100];
+
+ final int n = s.getInputStream().read(tmpbuf);
+
+ if (n < 0) {
+ s.close();
+ throw new IOException("Nameserver not responding on "
+ + node.host() + " when looking up " + node.alive());
+ }
+
+ @SuppressWarnings("resource")
+ final OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
+
+ final int response = ibuf.read1();
+ if (response == port4resp) {
+ final int result = ibuf.read1();
+ if (result == 0) {
+ port = ibuf.read2BE();
+
+ node.ntype = ibuf.read1();
+ node.proto = ibuf.read1();
+ node.distHigh = ibuf.read2BE();
+ node.distLow = ibuf.read2BE();
+ // ignore rest of fields
+ }
+ }
+ } catch (final IOException e) {
+ if (traceLevel >= traceThreshold) {
+ System.out.println("<- (no response)");
+ }
+ throw new IOException("Nameserver not responding on " + node.host()
+ + " when looking up " + node.alive(), e);
+ } catch (final OtpErlangDecodeException e) {
+ if (traceLevel >= traceThreshold) {
+ System.out.println("<- (invalid response)");
+ }
+ throw new IOException("Nameserver not responding on " + node.host()
+ + " when looking up " + node.alive());
+ } finally {
+ try {
+ if (s != null) {
+ s.close();
+ }
+ } catch (final IOException e) { /* ignore close errors */
+ }
+ s = null;
+ }
+
+ if (traceLevel >= traceThreshold) {
+ if (port == 0) {
+ System.out.println("<- NOT FOUND");
+ } else {
+ System.out.println("<- PORT " + port);
+ }
+ }
+ return port;
}
/*
- * this function will get an exception if it tries to talk to a
- * very old epmd, or if something else happens that it cannot
- * forsee. In both cases we return an exception. We no longer
- * support r3, so the exception is fatal. If we manage to
- * successfully communicate with an r4 epmd, we return either the
- * socket, or null, depending on the result.
+ * this function will get an exception if it tries to talk to a very old
+ * epmd, or if something else happens that it cannot forsee. In both cases
+ * we return an exception. We no longer support r3, so the exception is
+ * fatal. If we manage to successfully communicate with an r4 epmd, we
+ * return either the socket, or null, depending on the result.
*/
- private static Socket r4_publish(final OtpLocalNode node)
- throws IOException {
- Socket s = null;
-
- try {
- final OtpOutputStream obuf = new OtpOutputStream();
- s = new Socket((String) null, EpmdPort.get());
-
- obuf.write2BE(node.alive().length() + 13);
-
- obuf.write1(publish4req);
- obuf.write2BE(node.port());
-
- obuf.write1(node.type());
-
- obuf.write1(node.proto());
- obuf.write2BE(node.distHigh());
- obuf.write2BE(node.distLow());
-
- obuf.write2BE(node.alive().length());
- obuf.writeN(node.alive().getBytes());
- obuf.write2BE(0); // No extra
-
- // send request
- obuf.writeTo(s.getOutputStream());
-
- if (traceLevel >= traceThreshold) {
- System.out.println("-> PUBLISH (r4) " + node + " port="
- + node.port());
- }
-
- // get reply
- final byte[] tmpbuf = new byte[100];
- final int n = s.getInputStream().read(tmpbuf);
-
- if (n < 0) {
- if (s != null) {
- s.close();
- }
- throw new IOException("Nameserver not responding on "
- + node.host() + " when publishing " + node.alive());
- }
-
- final OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
-
- final int response = ibuf.read1();
- if (response == publish4resp) {
- final int result = ibuf.read1();
- if (result == 0) {
- node.creation = ibuf.read2BE();
- if (traceLevel >= traceThreshold) {
- System.out.println("<- OK");
- }
- return s; // success
- }
- }
- } catch (final IOException e) {
- // epmd closed the connection = fail
- if (s != null) {
- s.close();
- }
- if (traceLevel >= traceThreshold) {
- System.out.println("<- (no response)");
- }
- throw new IOException("Nameserver not responding on " + node.host()
- + " when publishing " + node.alive());
- } catch (final OtpErlangDecodeException e) {
- if (s != null) {
- s.close();
- }
- if (traceLevel >= traceThreshold) {
- System.out.println("<- (invalid response)");
- }
- throw new IOException("Nameserver not responding on " + node.host()
- + " when publishing " + node.alive());
- }
-
- if (s != null) {
- s.close();
- }
- return null;
+ private static OtpTransport r4_publish(final OtpLocalNode node)
+ throws IOException {
+ OtpTransport s = null;
+
+ try {
+ @SuppressWarnings("resource")
+ final OtpOutputStream obuf = new OtpOutputStream();
+ s = node.createTransport((String) null, EpmdPort.get());
+
+ obuf.write2BE(node.alive().length() + 13);
+
+ obuf.write1(publish4req);
+ obuf.write2BE(node.port());
+
+ obuf.write1(node.type());
+
+ obuf.write1(node.proto());
+ obuf.write2BE(node.distHigh());
+ obuf.write2BE(node.distLow());
+
+ obuf.write2BE(node.alive().length());
+ obuf.writeN(node.alive().getBytes());
+ obuf.write2BE(0); // No extra
+
+ // send request
+ obuf.writeToAndFlush(s.getOutputStream());
+
+ if (traceLevel >= traceThreshold) {
+ System.out.println("-> PUBLISH (r4) " + node + " port="
+ + node.port());
+ }
+
+ // get reply
+ final byte[] tmpbuf = new byte[100];
+ final int n = s.getInputStream().read(tmpbuf);
+
+ if (n < 0) {
+ s.close();
+ throw new IOException("Nameserver not responding on "
+ + node.host() + " when publishing " + node.alive());
+ }
+
+ @SuppressWarnings("resource")
+ final OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
+
+ final int response = ibuf.read1();
+ if (response == publish4resp) {
+ final int result = ibuf.read1();
+ if (result == 0) {
+ node.creation = ibuf.read2BE();
+ if (traceLevel >= traceThreshold) {
+ System.out.println("<- OK");
+ }
+ return s; // success
+ }
+ }
+ } catch (final IOException e) {
+ // epmd closed the connection = fail
+ if (s != null) {
+ s.close();
+ }
+ if (traceLevel >= traceThreshold) {
+ System.out.println("<- (no response)");
+ }
+ throw new IOException("Nameserver not responding on " + node.host()
+ + " when publishing " + node.alive());
+ } catch (final OtpErlangDecodeException e) {
+ s.close();
+ if (traceLevel >= traceThreshold) {
+ System.out.println("<- (invalid response)");
+ }
+ throw new IOException("Nameserver not responding on " + node.host()
+ + " when publishing " + node.alive());
+ }
+
+ s.close();
+ return null;
}
public static String[] lookupNames() throws IOException {
- return lookupNames(InetAddress.getByName(null));
+ return lookupNames(InetAddress.getByName(null),
+ new OtpSocketTransportFactory());
+ }
+
+ public static String[] lookupNames(
+ final OtpTransportFactory transportFactory) throws IOException {
+ return lookupNames(InetAddress.getByName(null), transportFactory);
}
public static String[] lookupNames(final InetAddress address)
- throws IOException {
- Socket s = null;
-
- try {
- final OtpOutputStream obuf = new OtpOutputStream();
- try {
- s = new Socket(address, EpmdPort.get());
-
- obuf.write2BE(1);
- obuf.write1(names4req);
- // send request
- obuf.writeTo(s.getOutputStream());
-
- if (traceLevel >= traceThreshold) {
- System.out.println("-> NAMES (r4) ");
- }
-
- // get reply
- final byte[] buffer = new byte[256];
- final ByteArrayOutputStream out = new ByteArrayOutputStream(256);
- while (true) {
- final int bytesRead = s.getInputStream().read(buffer);
- if (bytesRead == -1) {
- break;
- }
- out.write(buffer, 0, bytesRead);
- }
- final byte[] tmpbuf = out.toByteArray();
- final OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
- ibuf.read4BE(); // read port int
- // final int port = ibuf.read4BE();
- // check if port = epmdPort
-
- final int n = tmpbuf.length;
- final byte[] buf = new byte[n - 4];
- System.arraycopy(tmpbuf, 4, buf, 0, n - 4);
- final String all = OtpErlangString.newString(buf);
- return all.split("\n");
- } finally {
- if (s != null) {
- s.close();
- }
- }
-
- } catch (final IOException e) {
- if (traceLevel >= traceThreshold) {
- System.out.println("<- (no response)");
- }
- throw new IOException(
- "Nameserver not responding when requesting names");
- } catch (final OtpErlangDecodeException e) {
- if (traceLevel >= traceThreshold) {
- System.out.println("<- (invalid response)");
- }
- throw new IOException(
- "Nameserver not responding when requesting names");
- }
+ throws IOException {
+ return lookupNames(address, new OtpSocketTransportFactory());
+ }
+
+ public static String[] lookupNames(final InetAddress address,
+ final OtpTransportFactory transportFactory) throws IOException {
+ OtpTransport s = null;
+
+ try {
+ @SuppressWarnings("resource")
+ final OtpOutputStream obuf = new OtpOutputStream();
+ try {
+ s = transportFactory.createTransport(address, EpmdPort.get());
+
+ obuf.write2BE(1);
+ obuf.write1(names4req);
+ // send request
+ obuf.writeToAndFlush(s.getOutputStream());
+
+ if (traceLevel >= traceThreshold) {
+ System.out.println("-> NAMES (r4) ");
+ }
+
+ // get reply
+ final byte[] buffer = new byte[256];
+ final ByteArrayOutputStream out = new ByteArrayOutputStream(256);
+ while (true) {
+ final int bytesRead = s.getInputStream().read(buffer);
+ if (bytesRead == -1) {
+ break;
+ }
+ out.write(buffer, 0, bytesRead);
+ }
+ final byte[] tmpbuf = out.toByteArray();
+ @SuppressWarnings("resource")
+ final OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
+ ibuf.read4BE(); // read port int
+ // final int port = ibuf.read4BE();
+ // check if port = epmdPort
+
+ final int n = tmpbuf.length;
+ final byte[] buf = new byte[n - 4];
+ System.arraycopy(tmpbuf, 4, buf, 0, n - 4);
+ final String all = OtpErlangString.newString(buf);
+ return all.split("\n");
+ } finally {
+ if (s != null) {
+ s.close();
+ }
+ }
+
+ } catch (final IOException e) {
+ if (traceLevel >= traceThreshold) {
+ System.out.println("<- (no response)");
+ }
+ throw new IOException(
+ "Nameserver not responding when requesting names");
+ } catch (final OtpErlangDecodeException e) {
+ if (traceLevel >= traceThreshold) {
+ System.out.println("<- (invalid response)");
+ }
+ throw new IOException(
+ "Nameserver not responding when requesting names");
+ }
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-04 07:00:21 +0000