author | erikj |
Tue, 12 Sep 2017 19:03:39 +0200 | |
changeset 47216 | 71c04702a3d5 |
parent 37781 | jdk/src/java.base/unix/classes/sun/net/sdp/SdpProvider.java@71ed5645f17c |
child 53018 | 8bf9268df0e2 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.net.sdp; |
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import sun.net.NetHooks; |
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import java.net.InetAddress; |
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import java.net.Inet4Address; |
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import java.net.UnknownHostException; |
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import java.util.*; |
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import java.io.File; |
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import java.io.FileDescriptor; |
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import java.io.IOException; |
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import java.io.PrintStream; |
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import sun.net.sdp.SdpSupport; |
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import sun.security.action.GetPropertyAction; |
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/** |
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* A NetHooks provider that converts sockets from the TCP to SDP protocol prior |
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* to binding or connecting. |
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*/ |
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public class SdpProvider extends NetHooks.Provider { |
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// maximum port |
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private static final int MAX_PORT = 65535; |
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// indicates if SDP is enabled and the rules for when the protocol is used |
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private final boolean enabled; |
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private final List<Rule> rules; |
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// logging for debug purposes |
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private PrintStream log; |
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public SdpProvider() { |
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71ed5645f17c
8155775: Re-examine naming of privileged methods to access System properties
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changeset
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Properties props = GetPropertyAction.privilegedGetProperties(); |
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// if this property is not defined then there is nothing to do. |
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71ed5645f17c
8155775: Re-examine naming of privileged methods to access System properties
redestad
parents:
37593
diff
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String file = props.getProperty("com.sun.sdp.conf"); |
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if (file == null) { |
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this.enabled = false; |
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this.rules = null; |
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return; |
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} |
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// load configuration file |
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List<Rule> list = null; |
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71ed5645f17c
8155775: Re-examine naming of privileged methods to access System properties
redestad
parents:
37593
diff
changeset
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try { |
71ed5645f17c
8155775: Re-examine naming of privileged methods to access System properties
redestad
parents:
37593
diff
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list = loadRulesFromFile(file); |
71ed5645f17c
8155775: Re-examine naming of privileged methods to access System properties
redestad
parents:
37593
diff
changeset
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} catch (IOException e) { |
71ed5645f17c
8155775: Re-examine naming of privileged methods to access System properties
redestad
parents:
37593
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fail("Error reading %s: %s", file, e.getMessage()); |
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} |
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// check if debugging is enabled |
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PrintStream out = null; |
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71ed5645f17c
8155775: Re-examine naming of privileged methods to access System properties
redestad
parents:
37593
diff
changeset
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String logfile = props.getProperty("com.sun.sdp.debug"); |
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if (logfile != null) { |
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out = System.out; |
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if (logfile.length() > 0) { |
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try { |
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out = new PrintStream(logfile); |
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} catch (IOException ignore) { } |
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} |
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} |
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this.enabled = !list.isEmpty(); |
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this.rules = list; |
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this.log = out; |
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} |
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// supported actions |
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private static enum Action { |
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BIND, |
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CONNECT; |
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} |
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// a rule for matching a bind or connect request |
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private static interface Rule { |
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boolean match(Action action, InetAddress address, int port); |
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} |
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// rule to match port[-end] |
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private static class PortRangeRule implements Rule { |
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private final Action action; |
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private final int portStart; |
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private final int portEnd; |
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PortRangeRule(Action action, int portStart, int portEnd) { |
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this.action = action; |
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this.portStart = portStart; |
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this.portEnd = portEnd; |
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} |
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Action action() { |
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return action; |
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} |
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@Override |
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public boolean match(Action action, InetAddress address, int port) { |
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return (action == this.action && |
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port >= this.portStart && |
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port <= this.portEnd); |
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} |
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} |
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// rule to match address[/prefix] port[-end] |
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private static class AddressPortRangeRule extends PortRangeRule { |
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private final byte[] addressAsBytes; |
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private final int prefixByteCount; |
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private final byte mask; |
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AddressPortRangeRule(Action action, InetAddress address, |
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int prefix, int port, int end) |
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{ |
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super(action, port, end); |
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this.addressAsBytes = address.getAddress(); |
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this.prefixByteCount = prefix >> 3; |
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this.mask = (byte)(0xff << (8 - (prefix % 8))); |
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} |
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@Override |
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public boolean match(Action action, InetAddress address, int port) { |
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if (action != action()) |
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return false; |
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byte[] candidate = address.getAddress(); |
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// same address type? |
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if (candidate.length != addressAsBytes.length) |
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return false; |
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// check bytes |
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for (int i=0; i<prefixByteCount; i++) { |
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if (candidate[i] != addressAsBytes[i]) |
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return false; |
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} |
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// check remaining bits |
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if ((prefixByteCount < addressAsBytes.length) && |
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((candidate[prefixByteCount] & mask) != |
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(addressAsBytes[prefixByteCount] & mask))) |
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return false; |
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return super.match(action, address, port); |
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} |
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} |
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// parses port:[-end] |
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private static int[] parsePortRange(String s) { |
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int pos = s.indexOf('-'); |
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try { |
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int[] result = new int[2]; |
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if (pos < 0) { |
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boolean all = s.equals("*"); |
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result[0] = all ? 0 : Integer.parseInt(s); |
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result[1] = all ? MAX_PORT : result[0]; |
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} else { |
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String low = s.substring(0, pos); |
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if (low.length() == 0) low = "*"; |
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String high = s.substring(pos+1); |
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if (high.length() == 0) high = "*"; |
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result[0] = low.equals("*") ? 0 : Integer.parseInt(low); |
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result[1] = high.equals("*") ? MAX_PORT : Integer.parseInt(high); |
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} |
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return result; |
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} catch (NumberFormatException e) { |
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return new int[0]; |
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} |
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} |
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private static void fail(String msg, Object... args) { |
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Formatter f = new Formatter(); |
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f.format(msg, args); |
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throw new RuntimeException(f.out().toString()); |
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} |
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// loads rules from the given file |
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// Each non-blank/non-comment line must have the format: |
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// ("bind" | "connect") 1*LWSP-char (hostname | ipaddress["/" prefix]) |
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// 1*LWSP-char ("*" | port) [ "-" ("*" | port) ] |
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private static List<Rule> loadRulesFromFile(String file) |
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throws IOException |
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{ |
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Scanner scanner = new Scanner(new File(file)); |
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try { |
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List<Rule> result = new ArrayList<>(); |
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while (scanner.hasNextLine()) { |
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String line = scanner.nextLine().trim(); |
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// skip blank lines and comments |
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if (line.length() == 0 || line.charAt(0) == '#') |
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continue; |
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// must have 3 fields |
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String[] s = line.split("\\s+"); |
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if (s.length != 3) { |
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fail("Malformed line '%s'", line); |
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continue; |
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} |
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// first field is the action ("bind" or "connect") |
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Action action = null; |
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for (Action a: Action.values()) { |
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if (s[0].equalsIgnoreCase(a.name())) { |
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action = a; |
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break; |
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} |
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} |
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if (action == null) { |
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fail("Action '%s' not recognized", s[0]); |
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continue; |
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} |
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// * port[-end] |
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int[] ports = parsePortRange(s[2]); |
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if (ports.length == 0) { |
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fail("Malformed port range '%s'", s[2]); |
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continue; |
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} |
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// match all addresses |
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if (s[1].equals("*")) { |
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result.add(new PortRangeRule(action, ports[0], ports[1])); |
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continue; |
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} |
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// hostname | ipaddress[/prefix] |
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int pos = s[1].indexOf('/'); |
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try { |
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if (pos < 0) { |
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// hostname or ipaddress (no prefix) |
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InetAddress[] addresses = InetAddress.getAllByName(s[1]); |
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for (InetAddress address: addresses) { |
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int prefix = |
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(address instanceof Inet4Address) ? 32 : 128; |
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result.add(new AddressPortRangeRule(action, address, |
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prefix, ports[0], ports[1])); |
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} |
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} else { |
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// ipaddress/prefix |
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InetAddress address = InetAddress |
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.getByName(s[1].substring(0, pos)); |
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int prefix = -1; |
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try { |
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8055032: Improve numerical parsing in java.net and sun.net
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25859
diff
changeset
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prefix = Integer.parseInt(s[1], pos + 1, |
6b160d97c51d
8055032: Improve numerical parsing in java.net and sun.net
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parents:
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diff
changeset
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s[1].length(), 10); |
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if (address instanceof Inet4Address) { |
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// must be 1-31 |
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if (prefix < 0 || prefix > 32) prefix = -1; |
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} else { |
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// must be 1-128 |
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if (prefix < 0 || prefix > 128) prefix = -1; |
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} |
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} catch (NumberFormatException e) { |
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} |
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if (prefix > 0) { |
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result.add(new AddressPortRangeRule(action, |
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address, prefix, ports[0], ports[1])); |
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} else { |
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fail("Malformed prefix '%s'", s[1]); |
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continue; |
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} |
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} |
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} catch (UnknownHostException uhe) { |
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fail("Unknown host or malformed IP address '%s'", s[1]); |
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continue; |
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} |
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} |
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return result; |
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} finally { |
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scanner.close(); |
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} |
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} |
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// converts unbound TCP socket to a SDP socket if it matches the rules |
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private void convertTcpToSdpIfMatch(FileDescriptor fdObj, |
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Action action, |
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InetAddress address, |
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int port) |
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throws IOException |
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{ |
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boolean matched = false; |
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for (Rule rule: rules) { |
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if (rule.match(action, address, port)) { |
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SdpSupport.convertSocket(fdObj); |
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matched = true; |
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break; |
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} |
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} |
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if (log != null) { |
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String addr = (address instanceof Inet4Address) ? |
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address.getHostAddress() : "[" + address.getHostAddress() + "]"; |
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if (matched) { |
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log.format("%s to %s:%d (socket converted to SDP protocol)\n", action, addr, port); |
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} else { |
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log.format("%s to %s:%d (no match)\n", action, addr, port); |
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} |
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} |
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} |
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@Override |
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public void implBeforeTcpBind(FileDescriptor fdObj, |
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InetAddress address, |
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int port) |
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throws IOException |
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{ |
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if (enabled) |
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convertTcpToSdpIfMatch(fdObj, Action.BIND, address, port); |
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} |
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||
323 |
@Override |
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324 |
public void implBeforeTcpConnect(FileDescriptor fdObj, |
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InetAddress address, |
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int port) |
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throws IOException |
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{ |
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329 |
if (enabled) |
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convertTcpToSdpIfMatch(fdObj, Action.CONNECT, address, port); |
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} |
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332 |
} |