Package com.tailf.ned

Class SSHSession

Object

com.tailf.ned.SSHSession

All Implemented Interfaces:

CliSession

public class SSHSession
extends Object
implements CliSession

A SSH transport. This class uses the Ganymed SSH implementation. ( http://www.ganymed.ethz.ch/ssh2/)

Example:

 SSHConnection c = new SSHConnection("127.0.0.1", 22);
 c.authenticateWithPassword("ola", "secret");
 SSHSession ssh = new SSHSession(c);
 

Constructor Summary

Constructors

Constructor	Description
SSHSession(SSHConnection con)	Constructor for SSH session object.
SSHSession(SSHConnection con, int readTimeout, NedTracer tracer, NedConnectionBase conn)	Constructor with an extra argument for a readTimeout timer.
SSHSession(SSHConnection con, int readTimeout, NedTracer tracer, NedConnectionBase conn, int width, int height)	Constructor with extra terminal width and height arguments
SSHSession(SSHConnection con, NedTracer tracer, NedConnectionBase conn)	Constructor for SSH session object.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes the SSH connection, including all sessions (only one in this case, compared to many in Netconf)
String	expect(String str)	Read from socket until Pattern is encountered.
NedExpectResult	expect(String[] str)
NedExpectResult	expect(String[] str, boolean include, int timeout)
NedExpectResult	expect(String[] str, boolean include, int timeout, NedWorker worker)
NedExpectResult	expect(String[] str, NedWorker worker)
String	expect(String str, boolean include, boolean full, int timeout)	Read from socket until Pattern is encountered.
String	expect(String str, boolean include, boolean full, int timeout, NedWorker worker)
String	expect(String str, boolean include, int timeout)	Read from socket until Pattern is encountered.
String	expect(String str, boolean include, int timeout, NedWorker worker)
String	expect(String str, int timeout)	Read from socket until Pattern is encountered.
String	expect(String str, int timeout, NedWorker worker)
String	expect(String str, NedWorker worker)
String	expect(Pattern p)
NedExpectResult	expect(Pattern[] p)
NedExpectResult	expect(Pattern[] p, boolean include, int timeout)
NedExpectResult	expect(Pattern[] p, boolean include, int timeout, boolean full)
NedExpectResult	expect(Pattern[] p, boolean include, int timeout, boolean full, NedWorker worker)
NedExpectResult	expect(Pattern[] p, boolean include, int timeout, NedWorker worker)
NedExpectResult	expect(Pattern[] p, NedWorker worker)
String	expect(Pattern p, boolean include, int timeout)
String	expect(Pattern p, boolean include, int timeout, NedWorker worker)
String	expect(Pattern p, NedWorker worker)
String	expectStr(String str, boolean include, int timeout)	Read from socket until Pattern is encountered.
void	flush()	Signals that the final chunk of data has be printed to the output transport stream.
int	getReadTimeout()	Return the readTimeout value that is used to read data from the ssh socket.
ch.ethz.ssh2.Session	getSession()	Needed by users that need to monitor a session for EOF .
ch.ethz.ssh2.Connection	getSSHConnection()	Return the underlying ssh connection object
void	print(int iVal)	Prints an integer (as text) to the output stream.
void	print(String s)	Prints text to the output stream.
void	println(int iVal)	Prints an integer (as text) to the output stream.
void	println(String s)	Print text to the output stream.
int	readUntilWouldBlock()	If we have readTimeout set, and an outstanding operation was timed out - the socket may still be alive.
boolean	ready()	Tell whether this transport is ready to be read.
boolean	ready(int timeout)
boolean	serverSideClosed()	given a live SSHSession, check if the server side has closed it's end of the ssh socket
void	setReadTimeout(int readTimeout)	Set the read timeout
void	setTracer(NedTracer tracer)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SSHSession

public SSHSession(SSHConnection con)
           throws IOException

Constructor for SSH session object. This method creates a a new SSh channel on top of an existing connection. SSHSession objects implement the Transport interface and they are passed into the constructor of the NetconfSession class.

Parameters:

con - an established and authenticated SSH connection

Throws:

IOException

SSHSession

public SSHSession(SSHConnection con,
 NedTracer tracer,
 NedConnectionBase conn)
           throws IOException

Constructor for SSH session object. This method creates a a new SSH channel on top of an existing connection. SSHSession objects implement the Transport interface and they are passed into the constructor of the NetconfSession class.

Parameters:

con - an established and authenticated SSH connection

tracer - Ned tracer

conn - NedConnection object

Throws:

IOException

SSHSession

public SSHSession(SSHConnection con,
 int readTimeout,
 NedTracer tracer,
 NedConnectionBase conn)
           throws IOException

Constructor with an extra argument for a readTimeout timer.

Parameters:

con - an established and authenticated SSH connection

readTimeout - timeout in milliseconds

tracer - Ned Tracer

conn - NedConnection object

Throws:

IOException

SSHSession

public SSHSession(SSHConnection con,
 int readTimeout,
 NedTracer tracer,
 NedConnectionBase conn,
 int width,
 int height)
           throws IOException

Constructor with extra terminal width and height arguments

Parameters:

con - an established and authenticated SSH connection

readTimeout - timeout in milliseconds

tracer - Ned Tracer

conn - NedConnection object

width - Terminal width (in characters)

height - Terminal height (in characters)

Throws:

IOException

Method Details

getSSHConnection

public ch.ethz.ssh2.Connection getSSHConnection()

Return the underlying ssh connection object

getReadTimeout

public int getReadTimeout()

Return the readTimeout value that is used to read data from the ssh socket. If a read doesn't complete within the stipulated timeout an INMException is thrown *

setReadTimeout

public void setReadTimeout(int readTimeout)

Set the read timeout

Parameters:

readTimeout - timeout in milliseconds The readTimeout parameter affects all read operations. If a timeout is reached, an INMException is thrown. The socket is not closed.

ready

public boolean ready()
              throws IOException

Tell whether this transport is ready to be read.

Returns:

true if there is something to read, false otherwise. This function can typically be used to poll a socket and see there is data to be read. The function will also return true if the server side has closed its end of the ssh socket. To explicitly just check for that, use the serverSideClosed() method.

Throws:

IOException

ready

public boolean ready(int timeout)
              throws IOException

Throws:

IOException

serverSideClosed

public boolean serverSideClosed()

given a live SSHSession, check if the server side has closed it's end of the ssh socket

Specified by:

serverSideClosed in interface CliSession

readUntilWouldBlock

public int readUntilWouldBlock()

If we have readTimeout set, and an outstanding operation was timed out - the socket may still be alive.

Returns:

number of discarded characters

expectStr

public String expectStr(String str,
 boolean include,
 int timeout)
                 throws SSHSessionException,
IOException

Read from socket until Pattern is encountered.

Parameters:

str - is a string which is match against each line read.

include - controls if the pattern should be include in the returned string or not.

Returns:

the characters read.

Throws:

SSHSessionException

IOException

expect

public String expect(String str)
              throws SSHSessionException,
IOException

Read from socket until Pattern is encountered.

Specified by:

expect in interface CliSession

Parameters:

str - is a regular expression pattern which is match against each line read.

Returns:

the characters read.

Throws:

SSHSessionException

IOException

expect

public String expect(Pattern p)
              throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

expect

public String expect(String str,
 NedWorker worker)
              throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

expect

public String expect(Pattern p,
 NedWorker worker)
              throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

expect

public String expect(String str,
 int timeout)
              throws SSHSessionException,
IOException

Read from socket until Pattern is encountered.

Specified by:

expect in interface CliSession

Parameters:

str - is a regular expression pattern which is match against each line read.

timeout - indicates the read timeout

Returns:

the characters read.

Throws:

SSHSessionException

IOException

expect

public String expect(String str,
 int timeout,
 NedWorker worker)
              throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

expect

public String expect(String str,
 boolean include,
 int timeout)
              throws SSHSessionException,
IOException

Read from socket until Pattern is encountered.

Specified by:

expect in interface CliSession

Parameters:

str - is a regular expression pattern which is match against each line read.

include - controls if the pattern should be include in the returned string or not.

Returns:

the characters read.

Throws:

SSHSessionException

IOException

expect

public String expect(Pattern p,
 boolean include,
 int timeout)
              throws SSHSessionException,
IOException

Throws:

SSHSessionException

IOException

expect

public NedExpectResult expect(String[] str)
                       throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

expect

public NedExpectResult expect(Pattern[] p)
                       throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

expect

public NedExpectResult expect(String[] str,
 boolean include,
 int timeout)
                       throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

expect

public NedExpectResult expect(Pattern[] p,
 boolean include,
 int timeout)
                       throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

expect

public String expect(String str,
 boolean include,
 int timeout,
 NedWorker worker)
              throws SSHSessionException,
IOException

Throws:

SSHSessionException

IOException

expect

public String expect(Pattern p,
 boolean include,
 int timeout,
 NedWorker worker)
              throws SSHSessionException,
IOException

Throws:

SSHSessionException

IOException

expect

public NedExpectResult expect(String[] str,
 NedWorker worker)
                       throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

expect

public NedExpectResult expect(Pattern[] p,
 NedWorker worker)
                       throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

expect

public NedExpectResult expect(String[] str,
 boolean include,
 int timeout,
 NedWorker worker)
                       throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

expect

public NedExpectResult expect(Pattern[] p,
 boolean include,
 int timeout,
 NedWorker worker)
                       throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

expect

public NedExpectResult expect(Pattern[] p,
 boolean include,
 int timeout,
 boolean full)
                       throws SSHSessionException,
IOException

Throws:

SSHSessionException

IOException

expect

public NedExpectResult expect(Pattern[] p,
 boolean include,
 int timeout,
 boolean full,
 NedWorker worker)
                       throws SSHSessionException,
IOException

Throws:

SSHSessionException

IOException

expect

public String expect(String str,
 boolean include,
 boolean full,
 int timeout)
              throws IOException,
SSHSessionException

Read from socket until Pattern is encountered.

Specified by:

expect in interface CliSession

Parameters:

str - is a regular expression pattern which is match against each line read.

include - controls if the pattern should be include in the returned string or not.

full - controls if the pattern should be matched against the entire line, or if a positive match is accepted whenever the pattern matches any substring on a line.

Returns:

the characters read.

Throws:

IOException

SSHSessionException

expect

public String expect(String str,
 boolean include,
 boolean full,
 int timeout,
 NedWorker worker)
              throws SSHSessionException,
IOException

Specified by:

expect in interface CliSession

Throws:

SSHSessionException

IOException

print

public void print(int iVal)

Prints an integer (as text) to the output stream.

Parameters:

iVal - Text to send to the stream.

print

public void print(String s)

Prints text to the output stream.

Specified by:

print in interface CliSession

Parameters:

s - Text to send to the stream.

println

public void println(int iVal)

Prints an integer (as text) to the output stream. A newline char is appended to end of the output stream.

Parameters:

iVal - Text to send to the stream.

println

public void println(String s)

Print text to the output stream. A newline char is appended to end of the output stream.

Specified by:

println in interface CliSession

Parameters:

s - Text to send to the stream.

flush

public void flush()

Signals that the final chunk of data has be printed to the output transport stream. This method furthermore flushes the transport output stream buffer.

Specified by:

flush in interface CliSession

getSession

public ch.ethz.ssh2.Session getSession()

Needed by users that need to monitor a session for EOF . This will return the underlying Ganymed SSH Session object. The ganymed Session object has a method waitForCondition() that can be used to check the connection state of an ssh socket. Assuming a A Session object s:

 int conditionSet =
     ChannelCondition.TIMEOUT ;amp
     ChannelCondition.CLOSED ;amp
     ChannelCondition.EOF;
     conditionSet = s.waitForCondition(conditionSet, 1);
  if (conditionSet != ChannelCondition.TIMEOUT) {
      // We know the server closed it's end of the ssh
      // socket
 

setTracer

public void setTracer(NedTracer tracer)

Specified by:

setTracer in interface CliSession

close

public void close()

Closes the SSH connection, including all sessions (only one in this case, compared to many in Netconf)

Specified by:

close in interface CliSession