com.dalsemi.shell.server.ftp
Class FTPSession
java.lang.Object
|
+--java.lang.Thread
|
+--com.dalsemi.shell.server.Session
|
+--com.dalsemi.shell.server.ftp.FTPSession
- public class FTPSession
- extends Session
This class encapsulates all functionality for an FTP session.
The FTP server listens to port 21 for connection requests.
When someone attempts to start an FTP session, they contact
port 21. The server spins off a session (an instance of this
class) to handle that session. The session allows you to log
into the system, then handles the communication between that
remote computer and the TINI system. The FTP server and
sessions are designed to be multi-threaded, allowing multiple
simultaneous FTP connections.
List of FTP return codes:
120 Service ready in nnn minutes
125 Data Connection already opening, transfer starting
150 File Status OK, about to open data connection
200 OK
202 Command not implemented
211 System status, or help reply
212 Directory status
213 File Status
214 Help Message
215 NAME system type
220 Service ready for new user
221 Service closing control connection
225 Data connection open , no transfer in progress
226 Closing data connection
227 Entering passive mode (h1 h2 h3 h4 p1 p2)
230 User logged in proceed
250 Requested file action OK completed
257 PATHNAME created
331 User name OK, need password
332 Need account for login
350 Requested action pending further info
421 Service not available, closing control connection
425 Can't open data connection
426 Connection closed, transfer aborted
450 Req file action not taken
451 Req action aborted - local error
452 Req action not taken (out of memory)
500 Syntax
501 Syntax in parameters or arguments
502 Command not implemented
503 Bad sequence of commands
504 Command not implemented for that parameter
530 Not logged in
532 Need acct for storing files
550 Requested action not taken (file not found, no access, etc.)
| Fields inherited from class com.dalsemi.shell.server.Session |
commandHistory,
CURRENT_COMMAND,
CURRENT_DIRECTORY,
currentCommand,
environment,
err,
in,
inCommand,
lastCommand,
loginStack,
myThreadID,
out,
paramsArray,
paramsVector,
password,
prompt,
PROMPT,
retArray,
server,
shutdown,
userName,
welcomeMessage |
| Methods inherited from class com.dalsemi.shell.server.Session |
addToHistory,
broadcast,
endSession,
execute,
forceEndSession,
getEnvironment,
getErrStream,
getFromEnvironment,
getHistoryNumber,
getOutputStream,
getParams,
getUserName,
inCommand,
parseLogin,
printHistory,
run,
stepDownHistory,
stepUpHistory,
su,
updatePrompt |
| Methods inherited from class java.lang.Thread |
activeCount,
checkAccess,
countStackFrames,
currentThread,
destroy,
dumpStack,
enumerate,
getName,
getPriority,
getThreadGroup,
interrupt,
interrupted,
isAlive,
isDaemon,
isInterrupted,
join,
join,
join,
resume,
setDaemon,
setName,
setPriority,
sleep,
sleep,
start,
stop,
stop,
suspend,
toString,
yield |
login
public void login()
throws IOException
- Logs the user into the system. This function will prompt the user
for username and password.
- Overrides:
- login in class Session
sessionEnding
protected void sessionEnding()
- Called to clean up when the session is ending. (i.e. the
user typed "exit", or something bad happened that causes the
session to terminate.) Closes all of the sockets associated
with this session.
- Overrides:
- sessionEnding in class Session
currentCommandFinished
protected void currentCommandFinished()
- Called after each command is completed. For example, the user
types "ls". The command is received and parsed, then the appropriate
command is called in the shell. Finally, we need send the correct
result code.
- Overrides:
- currentCommandFinished in class Session
exceptionThrown
protected void exceptionThrown(Exception ex)
- Called when an exception is thrown in a command. This function will
attempt to notify the user. Any exceptions raised specifically by
shell commands should try to give as descriptive a message to the
exception as possible.
- Overrides:
- exceptionThrown in class Session
- Parameters:
ex - The exception thrown.
getNextCommand
public String getNextCommand()
throws IOException
- Gets the next command from this session's input stream.
This effectively performs functionality like a readLine(), but gives
the stream a chance to parse the incoming data. This allows us to
translate FTP commands into system commands.
- Overrides:
- getNextCommand in class Session
- Returns:
- the next command from the input stream