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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 java.security.AccessController;
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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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// if this property is not defined then there is nothing to do.
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String file = AccessController.doPrivileged(
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new GetPropertyAction("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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if (file != null) {
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try {
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list = loadRulesFromFile(file);
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} catch (IOException e) {
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fail("Error reading %s: %s", file, e.getMessage());
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}
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}
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// check if debugging is enabled
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PrintStream out = null;
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String logfile = AccessController.doPrivileged(
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new GetPropertyAction("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<Rule>();
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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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prefix = Integer.parseInt(s[1].substring(pos+1));
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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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@Override
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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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if (enabled)
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convertTcpToSdpIfMatch(fdObj, Action.CONNECT, address, port);
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}
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}
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