/** Execute command. */
public void execute(
final FtpIoSession session, final FtpServerContext context, final FtpRequest request)
throws IOException, FtpException {
try {
// reset state variables
session.resetState();
// parse argument
ListArgument parsedArg = ListArgumentParser.parse(request.getArgument());
// checl that the directory or file exists
FtpFile file = session.getFileSystemView().getFile(parsedArg.getFile());
if (!file.doesExist()) {
LOG.debug("Listing on a non-existing file");
session.write(
LocalizedFtpReply.translate(
session,
request,
context,
FtpReply.REPLY_450_REQUESTED_FILE_ACTION_NOT_TAKEN,
"LIST",
null));
return;
}
// 24-10-2007 - added check if PORT or PASV is issued, see
// https://issues.apache.org/jira/browse/FTPSERVER-110
DataConnectionFactory connFactory = session.getDataConnection();
if (connFactory instanceof IODataConnectionFactory) {
InetAddress address = ((IODataConnectionFactory) connFactory).getInetAddress();
if (address == null) {
session.write(
new DefaultFtpReply(
FtpReply.REPLY_503_BAD_SEQUENCE_OF_COMMANDS,
"PORT or PASV must be issued first"));
return;
}
}
// get data connection
session.write(
LocalizedFtpReply.translate(
session, request, context, FtpReply.REPLY_150_FILE_STATUS_OKAY, "LIST", null));
DataConnection dataConnection;
try {
dataConnection = session.getDataConnection().openConnection();
} catch (Exception e) {
LOG.debug("Exception getting the output data stream", e);
session.write(
LocalizedFtpReply.translate(
session,
request,
context,
FtpReply.REPLY_425_CANT_OPEN_DATA_CONNECTION,
"LIST",
null));
return;
}
// transfer listing data
boolean failure = false;
try {
dataConnection.transferToClient(
session.getFtpletSession(),
directoryLister.listFiles(parsedArg, session.getFileSystemView(), LIST_FILE_FORMATER));
} catch (SocketException ex) {
LOG.debug("Socket exception during list transfer", ex);
failure = true;
session.write(
LocalizedFtpReply.translate(
session,
request,
context,
FtpReply.REPLY_426_CONNECTION_CLOSED_TRANSFER_ABORTED,
"LIST",
null));
} catch (IOException ex) {
LOG.debug("IOException during list transfer", ex);
failure = true;
session.write(
LocalizedFtpReply.translate(
session,
request,
context,
FtpReply.REPLY_551_REQUESTED_ACTION_ABORTED_PAGE_TYPE_UNKNOWN,
"LIST",
null));
} catch (IllegalArgumentException e) {
LOG.debug("Illegal list syntax: " + request.getArgument(), e);
// if listing syntax error - send message
session.write(
LocalizedFtpReply.translate(
session,
request,
context,
FtpReply.REPLY_501_SYNTAX_ERROR_IN_PARAMETERS_OR_ARGUMENTS,
"LIST",
null));
}
// if data transfer ok - send transfer complete message
if (!failure) {
session.write(
LocalizedFtpReply.translate(
session,
request,
context,
FtpReply.REPLY_226_CLOSING_DATA_CONNECTION,
"LIST",
null));
}
} finally {
session.getDataConnection().closeDataConnection();
}
}
