1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* This file is part of "JTA - Telnet/SSH for the JAVA(tm) platform".
*
* (c) Matthias L. Jugel, Marcus Meißner 1996-2005. All Rights Reserved.
*
* Please visit http://javatelnet.org/ for updates and contact.
*
* --LICENSE NOTICE--
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
* --LICENSE NOTICE--
*
*/
package de.mud.ssh;
import de.mud.telnet.ScriptHandler;
import de.mud.jta.Wrapper;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.Vector;
import java.util.Properties;
import java.awt.Dimension;
/**
* The telnet ssh is a sample class for how to use the SSH protocol
* handler of the JTA source package. To write a program using the wrapper
* you may use the following piece of code as an example:
* <PRE>
* SshWrapper telnet = new SshWrapper();
* try {
* ssh.connect(args[0], 23);
* ssh.login("user", "password");
* ssh.setPrompt("user@host");
* ssh.waitfor("Terminal type?");
* ssh.send("dumb");
* System.out.println(ssh.send("ls -l"));
* } catch(java.io.IOException e) {
* e.printStackTrace();
* }
* </PRE>
* Please keep in mind that the password is visible for anyone who can
* download the class file. So use this only for public accounts or if
* you are absolutely sure nobody can see the file.
* <P>
* <B>Maintainer:</B>Marcus Mei�ner
*
* @version $Id: SshWrapper.java 499 2005-09-29 08:24:54Z leo $
* @author Matthias L. Jugel, Marcus Mei�ner
*/
public class SshWrapper extends Wrapper {
protected SshIO handler;
/** debugging level */
private final static int debug = 0;
public SshWrapper() {
handler = new SshIO() {
/** get the current terminal type */
public String getTerminalType() {
return "vt320";
}
/** get the current window size */
public Dimension getWindowSize() {
return new Dimension(80,25);
}
/** notify about local echo */
public void setLocalEcho(boolean echo) {
/* EMPTY */
}
/** write data to our back end */
public void write(byte[] b) throws IOException {
out.write(b);
}
};
}
/**
* Send a command to the remote host. A newline is appended and if
* a prompt is set it will return the resulting data until the prompt
* is encountered.
* @param cmd the command
* @return output of the command or null if no prompt is set
*/
public String send(String cmd) throws IOException {
byte arr[];
arr = (cmd+"\n").getBytes();
// no write until authorization is done
for (int i=0;i<arr.length;i++) {
switch (arr[i]) {
case 10: /* \n -> \r */
arr[i] = 13;
break;
}
}
handler.sendData(new String(arr));
if(getPrompt() != null)
return waitfor(getPrompt());
return null;
}
/** Buffer for SSH input */
private byte[] buffer;
/** Position in SSH input buffer */
private int pos;
/**
* Read data from the backend and decrypt it. This is a buffering read
* as the encrypted information is usually smaller than its decrypted
* pendant. So it will not read from the backend as long as there is
* data in the buffer.
* @param b the buffer where to read the decrypted data in
* @return the amount of bytes actually read.
*/
public int read(byte[] b) throws IOException {
// Empty the buffer before we do anything else
if(buffer != null) {
int amount = ((buffer.length - pos) <= b.length) ?
buffer.length - pos : b.length;
System.arraycopy(buffer, pos, b, 0, amount);
if(pos + amount < buffer.length) {
pos += amount;
} else
buffer = null;
return amount;
}
// now that the buffer is empty let's read more data and decrypt it
int n = in.read(b);
if(n > 0) {
byte[] tmp = new byte[n];
System.arraycopy(b, 0, tmp, 0, n);
pos = 0;
buffer = handler.handleSSH(tmp);
if(debug > 0 && buffer != null && buffer.length > 0)
System.err.println("ssh: "+buffer);
if(buffer != null && buffer.length > 0) {
if(debug > 0)
System.err.println("ssh: incoming="+n+" now="+buffer.length);
int amount = buffer.length <= b.length ? buffer.length : b.length;
System.arraycopy(buffer, 0, b, 0, amount);
pos = n = amount;
if(amount == buffer.length) {
buffer = null;
pos = 0;
}
} else
return 0;
}
return n;
}
}
|
