| 1 | /******************************************************************************
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| 2 | *
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| 3 | * Copyright (c) 1998,99 by Mindbright Technology AB, Stockholm, Sweden.
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| 4 | * www.mindbright.se, [email protected]
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| 5 | *
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| 6 | * This program is free software; you can redistribute it and/or modify
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| 7 | * it under the terms of the GNU General Public License as published by
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| 8 | * the Free Software Foundation; either version 2 of the License, or
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| 9 | * (at your option) any later version.
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| 10 | *
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| 11 | * This program is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | * GNU General Public License for more details.
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| 15 | *
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| 16 | *****************************************************************************
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| 17 | * $Author: mats $
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| 18 | * $Date: 2000/03/30 13:36:59 $
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| 19 | * $Name: rel1-2-1 $
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| 20 | *****************************************************************************/
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| 21 | package mindbright.ssh;
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| 22 |
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| 23 | import java.net.*;
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| 24 | import java.io.*;
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| 25 |
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| 26 | public class SSHFtpTunnel extends SSHTunnel {
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| 27 |
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| 28 | public final static String TUNNEL_NAME = "#FTP";
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| 29 | public final static int MAX_REMOTE_LISTEN = 10;
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| 30 |
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| 31 | boolean havePORT;
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| 32 |
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| 33 | boolean waitingPASVResponse;
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| 34 | String localAddrPASVStr;
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| 35 | InetAddress localAddr;
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| 36 |
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| 37 | byte[][] newPortMsg;
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| 38 |
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| 39 | static int timeWaitKludgeToggler;
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| 40 | static Object timeWaitKludgeCrit = new Object();
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| 41 |
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| 42 | public SSHFtpTunnel(Socket ioSocket, int channelId, int remoteChannelId,
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| 43 | SSHChannelController controller)
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| 44 | throws IOException {
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| 45 | super(ioSocket, channelId, remoteChannelId, controller);
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| 46 |
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| 47 | int a1, a2, a3, a4;
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| 48 |
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| 49 | havePORT = controller.sshAsClient().havePORTFtp;
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| 50 |
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| 51 | if(havePORT) {
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| 52 | int firstPort = controller.sshAsClient().firstFTPPort;
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| 53 | byte[] serverAddr = controller.sshAsClient().getServerRealAddr().getAddress();
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| 54 | a1 = serverAddr[0] & 0xff;
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| 55 | a2 = serverAddr[1] & 0xff;
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| 56 | a3 = serverAddr[2] & 0xff;
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| 57 | a4 = serverAddr[3] & 0xff;
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| 58 | String msg;
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| 59 | newPortMsg = new byte[MAX_REMOTE_LISTEN][1];
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| 60 | for(int i = 0; i < MAX_REMOTE_LISTEN; i++) {
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| 61 | int p1 = ((firstPort + i) >>> 8) & 0xff;
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| 62 | int p2 = (firstPort + i) & 0xff;
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| 63 | msg = "PORT " + a1 + "," + a2 + "," + a3 + "," + a4 + "," + p1 + "," + p2 + "\n";
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| 64 | newPortMsg[i] = msg.getBytes();
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| 65 | }
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| 66 | }
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| 67 |
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| 68 | localAddr = controller.sshAsClient().getLocalAddr();
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| 69 |
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| 70 | byte[] localAddrArr = controller.sshAsClient().getLocalAddr().getAddress();
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| 71 |
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| 72 | if(localAddrArr[0] == 0) {
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| 73 | localAddrArr = InetAddress.getLocalHost().getAddress();
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| 74 | }
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| 75 |
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| 76 | a1 = localAddrArr[0] & 0xff;
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| 77 | a2 = localAddrArr[1] & 0xff;
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| 78 | a3 = localAddrArr[2] & 0xff;
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| 79 | a4 = localAddrArr[3] & 0xff;
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| 80 | localAddrPASVStr = a1 + "," + a2 + "," + a3 + "," + a4;
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| 81 | }
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| 82 |
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| 83 | boolean parseHostAndPort(String msg, int[] d) {
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| 84 | boolean ok = true;
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| 85 | int cl = 0;
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| 86 | int cn = 0;
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| 87 | try {
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| 88 | for(int i = 0; i < 6; i++) {
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| 89 | String num;
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| 90 | if(i == 5) {
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| 91 | cn = msg.indexOf(')', cl);
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| 92 | if(cn == -1)
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| 93 | cn = msg.indexOf('\r', cl);
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| 94 | else if(cn == -1)
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| 95 | cn = msg.indexOf('\n', cl);
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| 96 | } else
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| 97 | cn = msg.indexOf(',', cl);
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| 98 | num = msg.substring(cl, cn);
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| 99 | cl = cn + 1;
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| 100 | d[i] = Integer.parseInt(num);
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| 101 | }
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| 102 | } catch (Exception e) {
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| 103 | ok = false;
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| 104 | }
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| 105 | return ok;
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| 106 | }
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| 107 |
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| 108 | public void receive(SSHPdu pdu) {
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| 109 | String msg = new String(pdu.rawData(), pdu.rawOffset(), pdu.rawSize());
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| 110 |
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| 111 | if(msg.startsWith("PASV") || msg.startsWith("pasv")) {
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| 112 | waitingPASVResponse = true;
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| 113 | } else if(msg.startsWith("PORT ") || msg.startsWith("port ")) {
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| 114 | if(!havePORT) {
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| 115 | controller.alert("Ftp-client is using PORT commands, either \n" +
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| 116 | "enable 'passive mode' in the ftp-client or \n" +
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| 117 | "enable 'ftp PORT' in 'SSH Settings' and reconnect.");
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| 118 | } else {
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| 119 | msg = msg.substring(5);
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| 120 | int[] d = new int[6];
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| 121 |
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| 122 | if(parseHostAndPort(msg, d)) {
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| 123 | byte[] dst = pdu.rawData();
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| 124 | byte[] newmsg;
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| 125 | String mapName;
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| 126 |
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| 127 | synchronized(timeWaitKludgeCrit) {
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| 128 | newmsg = newPortMsg[timeWaitKludgeToggler];
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| 129 | mapName = TUNNEL_NAME + timeWaitKludgeToggler;
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| 130 | timeWaitKludgeToggler = (timeWaitKludgeToggler + 1) % MAX_REMOTE_LISTEN;
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| 131 | }
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| 132 |
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| 133 | int len = newmsg.length;
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| 134 | int off = pdu.rawOffset() - 4;
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| 135 | dst[off++] = (byte)((len >>> 24) & 0xff);
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| 136 | dst[off++] = (byte)((len >>> 16) & 0xff);
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| 137 | dst[off++] = (byte)((len >>> 8) & 0xff);
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| 138 | dst[off++] = (byte)(len & 0xff);
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| 139 | System.arraycopy(newmsg, 0, dst, off, len);
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| 140 | pdu.rawAdjustSize(off + len);
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| 141 |
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| 142 | String toHost = d[0] + "." + d[1] + "." + d[2] + "." + d[3];
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| 143 | int toPort = (d[4] << 8) | d[5];
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| 144 | controller.addHostMapTemporary(mapName, toHost, toPort);
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| 145 | } else {
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| 146 | controller.alert("Bug in SSHFtpTunnel (PORT), please report: " + msg);
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| 147 | }
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| 148 | }
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| 149 | }
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| 150 |
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| 151 | super.receive(pdu);
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| 152 | }
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| 153 |
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| 154 | public void transmit(SSHPdu pdu) {
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| 155 | SSHListenChannel listenChan = null;
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| 156 | String msg = new String(pdu.rawData(), pdu.rawOffset(), pdu.rawSize());
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| 157 |
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| 158 | if(waitingPASVResponse && msg.startsWith("227 ")) {
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| 159 | byte[] newmsg;
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| 160 | waitingPASVResponse = false;
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| 161 | msg = msg.substring(27);
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| 162 | int[] d = new int[6];
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| 163 | if(parseHostAndPort(msg, d)) {
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| 164 | String toHost = d[0] + "." + d[1] + "." + d[2] + "." + d[3];
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| 165 | int toPort = (d[4] << 8) | d[5];
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| 166 | int localPort;
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| 167 | try {
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| 168 | listenChan = controller.newListenChannel(localAddr.getHostAddress(), 0,
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| 169 | toHost, toPort, "general");
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| 170 | } catch(IOException e) {
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| 171 | controller.alert("Error in FtpTunnel: " + e.toString());
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| 172 | }
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| 173 | listenChan.setTemporaryListener(true); // Go away after next accept...
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| 174 | localPort = listenChan.getListenPort();
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| 175 | int p1 = (localPort >>> 8) & 0xff;
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| 176 | int p2 = localPort & 0xff;
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| 177 | msg = "227 Entering Passive Mode (" + localAddrPASVStr + "," + p1 + "," + p2 + ")\n";
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| 178 | newmsg = msg.getBytes();
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| 179 | pdu.rawSetData(newmsg);
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| 180 | } else {
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| 181 | controller.alert("Bug in SSHFtpTunnel (PASV), please report: " + msg);
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| 182 | }
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| 183 | }
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| 184 |
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| 185 | super.transmit(pdu);
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| 186 | }
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| 187 |
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| 188 | public String getDescription() {
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| 189 | if(ioSocket != null)
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| 190 | return ioSocket.getInetAddress().getHostAddress() + ":" + ioSocket.getPort() + " <-ftp-> " +
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| 191 | getLocalHost() + ":" + ioSocket.getLocalPort() + " <-ssh-> " + remoteDesc;
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| 192 | else
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| 193 | return "< N/A >";
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| 194 | }
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| 195 |
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| 196 | }
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