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import java.io.*;
import java.net.*;
import java.util.*;
public class FtpConnection extends Object
{
private static boolean PRINT_DEBUG_INFO = false;
private static int CONNECTION_MODE = 0;
private Socket connectionSocket = null;
private Socket pasvSocket = null;
private PrintStream outputStream = null;
private BufferedReader inputStream = null;
private long restartPoint = 0L;
private boolean loggedIn = false;
public String lineTerm = "\n";
private static int BLOCK_SIZE = 4096;
public FtpConnection ()
{
//Constructeur par defaut
}
public FtpConnection (boolean debugOut,int mode)
{
PRINT_DEBUG_INFO = debugOut;
CONNECTION_MODE = mode;
}
private void debugPrint(String message)
{
if (PRINT_DEBUG_INFO) System.err.println(message);
}
public boolean connect(String host)throws UnknownHostException, IOException
{
return connect(host, 21);
}
public boolean connect(String host, int port)throws UnknownHostException, IOException
{
connectionSocket = new Socket(host, port);
outputStream = new PrintStream(connectionSocket.getOutputStream());
inputStream = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
if (!isPositiveCompleteResponse(getServerReply())){
disconnect();
return false;
}
return true;
}
public void disconnect()
{
if (outputStream != null) {
try {
if (loggedIn) { logout(); };
outputStream.close();
inputStream.close();
connectionSocket.close();
} catch (IOException e) {}
outputStream = null;
inputStream = null;
connectionSocket = null;
}
}
public boolean login(String username, String password)throws IOException
{
int response = executeCommand("user " + username);
if (!isPositiveIntermediateResponse(response)) return false;
response = executeCommand("pass " + password);
loggedIn = isPositiveCompleteResponse(response);
return loggedIn;
}
public boolean logout()throws IOException
{
int response = executeCommand("quit");
loggedIn = !isPositiveCompleteResponse(response);
return !loggedIn;
}
public boolean changeDirectory(String directory)throws IOException
{
int response = executeCommand("cwd " + directory);
return isPositiveCompleteResponse(response);
}
public boolean renameFile(String oldName, String newName)throws IOException
{
int response = executeCommand("rnfr " + oldName);
if (!isPositiveIntermediateResponse(response)) return false;
response = executeCommand("rnto " + newName);
return isPositiveCompleteResponse(response);
}
public boolean makeDirectory(String directory)throws IOException
{
int response = executeCommand("mkd " + directory);
return isPositiveCompleteResponse(response);
}
public boolean removeDirectory(String directory)throws IOException
{
int response = executeCommand("rmd " + directory);
return isPositiveCompleteResponse(response);
}
public boolean parentDirectory()throws IOException
{
int response = executeCommand("cdup");
return isPositiveCompleteResponse(response);
}
public boolean deleteFile(String fileName)throws IOException
{
int response = executeCommand("dele " + fileName);
return isPositiveCompleteResponse(response);
}
public String getCurrentDirectory()throws IOException
{
String response = getExecutionResponse("pwd");
StringTokenizer strtok = new StringTokenizer(response);
// Get rid of the first token, which is the return code
if (strtok.countTokens() < 2) return null;
strtok.nextToken();
String directoryName = strtok.nextToken();
// Most servers surround the directory name with quotation marks
int strlen = directoryName.length();
if (strlen == 0) return null;
if (directoryName.charAt(0) == '\"') {
directoryName = directoryName.substring(1);
strlen--;
}
if (directoryName.charAt(strlen - 1) == '\"')
return directoryName.substring(0, strlen - 1);
return directoryName;
}
public String getSystemType()throws IOException
{
return excludeCode(getExecutionResponse("syst"));
}
public long getModificationTime(String fileName)throws IOException
{
String response = excludeCode(getExecutionResponse("MDTM " + fileName));
try {
return Long.parseLong(response);
} catch (Exception e) {
return -1L;
}
}
public long getFileSize(String fileName) throws IOException
{
String response = excludeCode(getExecutionResponse("size " + fileName));
try {
return Long.parseLong(response);
} catch (Exception e) {
return -1L;
}
}
public boolean downloadFile(String fileName) throws IOException
{
return readDataToFile("retr " + fileName, fileName);
}
public boolean downloadFile(String serverPath, String localPath)throws IOException
{
return readDataToFile("retr " + serverPath, localPath);
}
public boolean uploadFile(String fileName)throws IOException
{
return writeDataFromFile("stor " + fileName, fileName);
}
public boolean uploadFile(String serverPath, String localPath)throws IOException
{
return writeDataFromFile("stor " + serverPath, localPath);
}
public void setRestartPoint(int point)
{
restartPoint = point;
debugPrint("Restart noted");
}
private int getServerReply() throws IOException
{
return Integer.parseInt(getFullServerReply().substring(0, 3));
}
private String getFullServerReply() throws IOException
{
String reply;
do {
reply = inputStream.readLine();
debugPrint(reply);
} while(!(Character.isDigit(reply.charAt(0)) &&
Character.isDigit(reply.charAt(1)) &&
Character.isDigit(reply.charAt(2)) &&
reply.charAt(3) == ' '));
return reply;
}
private String getFullServerReply(StringBuffer fullReply)throws IOException
{
String reply;
fullReply.setLength(0);
do {
reply = inputStream.readLine();
debugPrint(reply);
fullReply.append(reply + lineTerm);
} while(!(Character.isDigit(reply.charAt(0)) &&
Character.isDigit(reply.charAt(1)) &&
Character.isDigit(reply.charAt(2)) &&
reply.charAt(3) == ' '));
if (fullReply.length() > 0)
{
fullReply.setLength(fullReply.length() - lineTerm.length());
}
return reply;
}
public String listFiles()
throws IOException
{
return listFiles("");
}
public String listFiles(String params) throws IOException
{
StringBuffer files = new StringBuffer();
StringBuffer dirs = new StringBuffer();
if (!getAndParseDirList(params, files, dirs))
{
debugPrint("Error getting file list");
}
return files.toString();
}
public String listSubdirectories()
throws IOException
{
return listSubdirectories("");
}
public String listSubdirectories(String params)throws IOException
{
StringBuffer files = new StringBuffer();
StringBuffer dirs = new StringBuffer();
if (!getAndParseDirList(params, files, dirs))
{
debugPrint("Error getting dir list");
}
return dirs.toString();
}
private String processFileListCommand(String command)throws IOException
{
StringBuffer reply = new StringBuffer();
String replyString;
//Il est a noté que le listing des fichiers et dossier nécéssite,
//comme le transfer de fichiers, d'une ouverture de port, coté client
//ou coté serveur en fonction du mode de connection (passif ou actif).
boolean success = executeDataCommand(command, reply);
if (!success)
{
return "";
}
replyString = reply.toString();
if(reply.length() > 0)
{
return replyString.substring(0, reply.length() - 1);
}
else
{
return replyString;
}
}
private boolean getAndParseDirList(String params, StringBuffer files, StringBuffer dirs)throws IOException
{
// On initialise à 0 les variables de retour
files.setLength(0);
dirs.setLength(0);
// On fait les demmandes de listage avec les commandes NLST et LIST
String shortList = processFileListCommand("NLST " + params);
String longList = processFileListCommand("LIST " + params);
// On tokenize les lignes récupérées
StringTokenizer sList = new StringTokenizer(shortList, "\n");
StringTokenizer lList = new StringTokenizer(longList, "\n");
// Variables donc on va avoir besoin...
String sString;
String lString;
// A noté que les deux lists ont le même nombre de ligne.
while ((sList.hasMoreTokens()) && (lList.hasMoreTokens())) {
sString = sList.nextToken();
lString = lList.nextToken();
if (lString.length() > 0)
{
if (lString.startsWith("d"))
{
dirs.append(sString.trim() + lineTerm);
debugPrint("Dir: " + sString);
}
else if (lString.startsWith("-"))
{
files.append(sString.trim() + lineTerm);
debugPrint("File: " + sString);
}
else
{
// Les liens symboliques commencent avec un "l"
// (lowercase L) mais ne sont pas géré ici.
debugPrint("Unknown: " + lString);
}
}
}
if (files.length() > 0) { files.setLength(files.length() - lineTerm.length()); }
if (dirs.length() > 0) { dirs.setLength(dirs.length() - lineTerm.length()); }
return true;
}
public int executeCommand(String command)throws IOException
{
if(PRINT_DEBUG_INFO) System.out.println(command);
outputStream.println(command);
return getServerReply();
}
public String getExecutionResponse(String command)throws IOException
{
if(PRINT_DEBUG_INFO) System.out.println(command);
outputStream.println(command);
return getFullServerReply();
}
public boolean readDataToFile(String command, String fileName)throws IOException
{
// On ouvre le fichier en local
RandomAccessFile outfile = new RandomAccessFile(fileName, "rw");
// On lance un restart si désiré
if (restartPoint != 0) {
debugPrint("Seeking to " + restartPoint);
outfile.seek(restartPoint);
}
// Converti le RandomAccessFile en un OutputStream
FileOutputStream fileStream = new FileOutputStream(outfile.getFD());
boolean success = executeDataCommand(command, fileStream);
outfile.close();
return success;
}
public boolean writeDataFromFile(String command, String fileName)throws IOException
{
// On ouvre le fichier en local
RandomAccessFile infile = new RandomAccessFile(fileName, "r");
// On lance un restart si désiré
if (restartPoint != 0) {
debugPrint("Seeking to " + restartPoint);
infile.seek(restartPoint);
}
// Converti le RandomAccessFile en un InputStream
FileInputStream fileStream = new FileInputStream(infile.getFD());
boolean success = executeDataCommand(command, fileStream);
infile.close();
return success;
}
public boolean executeDataCommand(String command, OutputStream out) throws IOException
{
//Mode passif
if(CONNECTION_MODE == 0)
{
if (!setupDataPasv(command)) return false;
InputStream in = pasvSocket.getInputStream();
transferData(in,out);
in.close();
pasvSocket.close();
}
//Mode actif
else if(CONNECTION_MODE == 1)
{
// On ouvre un socket de donné en local
ServerSocket serverSocket = new ServerSocket(0);
if (!setupDataPort(command, serverSocket)) return false;
Socket clientSocket = serverSocket.accept();
// On transfer les donnés
InputStream in = clientSocket.getInputStream();
transferData(in, out);
in.close();
clientSocket.close();
serverSocket.close();
}
return isPositiveCompleteResponse(getServerReply());
}
public boolean executeDataCommand(String command, InputStream in)throws IOException
{
//Mode passif
if(CONNECTION_MODE == 0)
{
if (!setupDataPasv(command)) return false;
OutputStream out = pasvSocket.getOutputStream();
transferData(in,out);
out.close();
pasvSocket.close();
}
//Mode actif
else if(CONNECTION_MODE == 1)
{
// On ouvre un socket de donné en local
ServerSocket serverSocket = new ServerSocket(0);
if (!setupDataPort(command, serverSocket)) return false;
Socket clientSocket = serverSocket.accept();
// On transfer les donnés
OutputStream out = clientSocket.getOutputStream();
transferData(in, out);
out.close();
clientSocket.close();
serverSocket.close();
}
return isPositiveCompleteResponse(getServerReply());
}
public boolean executeDataCommand(String command, StringBuffer sb)throws IOException
{
//Mode passif
if(CONNECTION_MODE == 0)
{
if (!setupDataPasv(command)) return false;
InputStream in = pasvSocket.getInputStream();
transferData(in,sb);
in.close();
pasvSocket.close();
}
//Mode actif
else if(CONNECTION_MODE == 1)
{
// On ouvre un socket de donné en local
ServerSocket serverSocket = new ServerSocket(0);
if (!setupDataPort(command, serverSocket)) return false;
Socket clientSocket = serverSocket.accept();
// On transfer les donnés
InputStream in = clientSocket.getInputStream();
transferData(in, sb);
in.close();
clientSocket.close();
serverSocket.close();
}
return isPositiveCompleteResponse(getServerReply());
}
private void transferData(InputStream in, OutputStream out) throws IOException
{
byte b[] = new byte[BLOCK_SIZE];
int amount;
// Stock les donnés dans un fichier
while ((amount = in.read(b)) > 0)
{
out.write(b, 0, amount);
}
}
private void transferData(InputStream in, StringBuffer sb) throws IOException
{
byte b[] = new byte[BLOCK_SIZE];
int amount;
// Stock les donnés dans un buffer
while ((amount = in.read(b)) > 0)
{
sb.append(new String(b, 0, amount));
}
}
private boolean setupDataPort(String command, ServerSocket serverSocket) throws IOException
{
if (!openPort(serverSocket)) return false;
// Lance le mode binaire pour la récéption des donnés
if(PRINT_DEBUG_INFO) System.out.println("TYPE i");
outputStream.println("TYPE i");
if (!isPositiveCompleteResponse(getServerReply()))
{
debugPrint("Could not set transfer type");
return false;
}
// Si l'on a un point de restart
if (restartPoint != 0) {
if(PRINT_DEBUG_INFO) System.out.println("rest " + restartPoint);
outputStream.println("rest " + restartPoint);
restartPoint = 0;
// TODO: Interpret server response here
getServerReply();
}
// Envoi de la command
if(PRINT_DEBUG_INFO) System.out.println(command);
outputStream.println(command);
return isPositivePreliminaryResponse(getServerReply());
}
private boolean setupDataPasv(String command) throws IOException
{
if (!openPasv()) return false;
// Lance le mode binaire pour la récéption des donnés
if(PRINT_DEBUG_INFO) System.out.println("TYPE i");
outputStream.println("TYPE i");
if (!isPositiveCompleteResponse(getServerReply()))
{
debugPrint("Could not set transfer type");
return false;
}
// Si l'on a un point de restart
if (restartPoint != 0) {
if(PRINT_DEBUG_INFO) System.out.println("rest " + restartPoint);
outputStream.println("rest " + restartPoint);
restartPoint = 0;
// TODO: Interpret server response here
getServerReply();
}
// Envoi de la command
if(PRINT_DEBUG_INFO) System.out.println(command);
outputStream.println(command);
return isPositivePreliminaryResponse(getServerReply());
}
private boolean openPort(ServerSocket serverSocket) throws IOException
{
int localport = serverSocket.getLocalPort();
// On récupère l'adresse IP locale
InetAddress inetaddress = serverSocket.getInetAddress();
InetAddress localip;
try
{
localip = inetaddress.getLocalHost();
}
catch(UnknownHostException e)
{
debugPrint("Can't get local host");
return false;
}
byte[] addrbytes = localip.getAddress();
short addrshorts[] = new short[4];
for(int i = 0; i <= 3; i++)
{
addrshorts[i] = addrbytes[i];
if (addrshorts[i] < 0)
addrshorts[i] += 256;
}
String port = "port " + addrshorts[0] + "," + addrshorts[1] +
"," + addrshorts[2] + "," + addrshorts[3] + "," +
((localport & 0xff00) >> 8) + "," +
(localport & 0x00ff);
if(PRINT_DEBUG_INFO) System.out.println(port);
outputStream.println(port);
return isPositiveCompleteResponse(getServerReply());
}
private boolean openPasv() throws IOException
{
//On passe en mode passif
String tmp = getExecutionResponse("PASV");
String pasv = excludeCode(tmp);
//On récupère l'IP et le PORT pour la connection
pasv = pasv.substring(pasv.indexOf("(")+1,pasv.indexOf(")"));
String[] splitedPasv = pasv.split(",");
int port1 = Integer.parseInt(splitedPasv[4]);
int port2 = Integer.parseInt(splitedPasv[5]);
int port = (port1*256)+port2;
String ip = splitedPasv[0]+"."+splitedPasv[1]+"."+splitedPasv[2]+"."+splitedPasv[3];
pasvSocket = new Socket(ip,port);
return isPositiveCompleteResponse(Integer.parseInt(tmp.substring(0,3)));
}
private boolean isPositivePreliminaryResponse(int response)
{
return (response >= 100 && response < 200);
}
private boolean isPositiveIntermediateResponse(int response)
{
return (response >= 300 && response < 400);
}
private boolean isPositiveCompleteResponse(int response)
{
return (response >= 200 && response < 300);
}
private boolean isTransientNegativeResponse(int response)
{
return (response >= 400 && response < 500);
}
private boolean isPermanentNegativeResponse(int response)
{
return (response >= 500 && response < 600);
}
private String excludeCode(String response)
{
if (response.length() < 5) return response;
return response.substring(4);
}
} |
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