com.trilead.ssh2.SFTPv3Client Maven / Gradle / Ivy
package com.trilead.ssh2;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.nio.charset.Charset;
import java.util.HashMap;
import java.util.Vector;
import com.trilead.ssh2.packets.TypesReader;
import com.trilead.ssh2.packets.TypesWriter;
import com.trilead.ssh2.sftp.AttribFlags;
import com.trilead.ssh2.sftp.ErrorCodes;
import com.trilead.ssh2.sftp.Packet;
/**
* A SFTPv3Client represents a SFTP (protocol version 3)
* client connection tunnelled over a SSH-2 connection. This is a very simple
* (synchronous) implementation.
*
* Basically, most methods in this class map directly to one of
* the packet types described in draft-ietf-secsh-filexfer-02.txt.
*
* Note: this is experimental code.
*
* Error handling: the methods of this class throw IOExceptions. However, unless
* there is catastrophic failure, exceptions of the type {@link SFTPv3Client} will
* be thrown (a subclass of IOException). Therefore, you can implement more verbose
* behavior by checking if a thrown exception if of this type. If yes, then you
* can cast the exception and access detailed information about the failure.
*
* Notes about file names, directory names and paths, copy-pasted
* from the specs:
*
* - SFTP v3 represents file names as strings. File names are
* assumed to use the slash ('/') character as a directory separator.
* - File names starting with a slash are "absolute", and are relative to
* the root of the file system. Names starting with any other character
* are relative to the user's default directory (home directory).
* - Servers SHOULD interpret a path name component ".." as referring to
* the parent directory, and "." as referring to the current directory.
* If the server implementation limits access to certain parts of the
* file system, it must be extra careful in parsing file names when
* enforcing such restrictions. There have been numerous reported
* security bugs where a ".." in a path name has allowed access outside
* the intended area.
* - An empty path name is valid, and it refers to the user's default
* directory (usually the user's home directory).
*
*
* If you are still not tired then please go on and read the comment for
* {@link #setCharset(String)}.
*
* @author Christian Plattner, [email protected]
* @version $Id: SFTPv3Client.java,v 1.2 2008/03/03 07:01:36 cplattne Exp $
*/
public class SFTPv3Client
{
final Connection conn;
final Session sess;
final PrintStream debug;
boolean flag_closed = false;
InputStream is;
OutputStream os;
int protocol_version = 0;
HashMap server_extensions = new HashMap();
int next_request_id = 1000;
String charsetName = null;
/**
* Create a SFTP v3 client.
*
* @param conn The underlying SSH-2 connection to be used.
* @param debug
* @throws IOException
*
* @deprecated this constructor (debug version) will disappear in the future,
* use {@link #SFTPv3Client(Connection)} instead.
*/
public SFTPv3Client(Connection conn, PrintStream debug) throws IOException
{
if (conn == null)
throw new IllegalArgumentException("Cannot accept null argument!");
this.conn = conn;
this.debug = debug;
if (debug != null)
debug.println("Opening session and starting SFTP subsystem.");
sess = conn.openSession();
sess.startSubSystem("sftp");
is = sess.getStdout();
os = new BufferedOutputStream(sess.getStdin(), 2048);
if ((is == null) || (os == null))
throw new IOException("There is a problem with the streams of the underlying channel.");
init();
}
/**
* Create a SFTP v3 client.
*
* @param conn The underlying SSH-2 connection to be used.
* @throws IOException
*/
public SFTPv3Client(Connection conn) throws IOException
{
this(conn, null);
}
/**
* Set the charset used to convert between Java Unicode Strings and byte encodings
* used by the server for paths and file names. Unfortunately, the SFTP v3 draft
* says NOTHING about such conversions (well, with the exception of error messages
* which have to be in UTF-8). Newer drafts specify to use UTF-8 for file names
* (if I remember correctly). However, a quick test using OpenSSH serving a EXT-3
* filesystem has shown that UTF-8 seems to be a bad choice for SFTP v3 (tested with
* filenames containing german umlauts). "windows-1252" seems to work better for Europe.
* Luckily, "windows-1252" is the platform default in my case =).
*
* If you don't set anything, then the platform default will be used (this is the default
* behavior).
*
* @see #getCharset()
*
* @param charset the name of the charset to be used or null to use the platform's
* default encoding.
* @throws IOException
*/
public void setCharset(String charset) throws IOException
{
if (charset == null)
{
charsetName = charset;
return;
}
try
{
Charset.forName(charset);
}
catch (Exception e)
{
throw (IOException) new IOException("This charset is not supported").initCause(e);
}
charsetName = charset;
}
/**
* The currently used charset for filename encoding/decoding.
*
* @see #setCharset(String)
*
* @return The name of the charset (null if the platform's default charset is being used)
*/
public String getCharset()
{
return charsetName;
}
private final void checkHandleValidAndOpen(SFTPv3FileHandle handle) throws IOException
{
if (handle.client != this)
throw new IOException("The file handle was created with another SFTPv3FileHandle instance.");
if (handle.isClosed == true)
throw new IOException("The file handle is closed.");
}
private final void sendMessage(int type, int requestId, byte[] msg, int off, int len) throws IOException
{
int msglen = len + 1;
if (type != Packet.SSH_FXP_INIT)
msglen += 4;
os.write(msglen >> 24);
os.write(msglen >> 16);
os.write(msglen >> 8);
os.write(msglen);
os.write(type);
if (type != Packet.SSH_FXP_INIT)
{
os.write(requestId >> 24);
os.write(requestId >> 16);
os.write(requestId >> 8);
os.write(requestId);
}
os.write(msg, off, len);
os.flush();
}
private final void sendMessage(int type, int requestId, byte[] msg) throws IOException
{
sendMessage(type, requestId, msg, 0, msg.length);
}
private final void readBytes(byte[] buff, int pos, int len) throws IOException
{
while (len > 0)
{
int count = is.read(buff, pos, len);
if (count < 0)
throw new IOException("Unexpected end of sftp stream.");
if ((count == 0) || (count > len))
throw new IOException("Underlying stream implementation is bogus!");
len -= count;
pos += count;
}
}
/**
* Read a message and guarantee that the contents is not larger than
* maxlen bytes.
*
* Note: receiveMessage(34000) actually means that the message may be up to 34004
* bytes (the length attribute preceeding the contents is 4 bytes).
*
* @param maxlen
* @return the message contents
* @throws IOException
*/
private final byte[] receiveMessage(int maxlen) throws IOException
{
byte[] msglen = new byte[4];
readBytes(msglen, 0, 4);
int len = (((msglen[0] & 0xff) << 24) | ((msglen[1] & 0xff) << 16) | ((msglen[2] & 0xff) << 8) | (msglen[3] & 0xff));
if ((len > maxlen) || (len <= 0))
throw new IOException("Illegal sftp packet len: " + len);
byte[] msg = new byte[len];
readBytes(msg, 0, len);
return msg;
}
private final int generateNextRequestID()
{
synchronized (this)
{
return next_request_id++;
}
}
private final void closeHandle(byte[] handle) throws IOException
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(handle, 0, handle.length);
sendMessage(Packet.SSH_FXP_CLOSE, req_id, tw.getBytes());
expectStatusOKMessage(req_id);
}
private SFTPv3FileAttributes readAttrs(TypesReader tr) throws IOException
{
/*
* uint32 flags
* uint64 size present only if flag SSH_FILEXFER_ATTR_SIZE
* uint32 uid present only if flag SSH_FILEXFER_ATTR_V3_UIDGID
* uint32 gid present only if flag SSH_FILEXFER_ATTR_V3_UIDGID
* uint32 permissions present only if flag SSH_FILEXFER_ATTR_PERMISSIONS
* uint32 atime present only if flag SSH_FILEXFER_ATTR_V3_ACMODTIME
* uint32 mtime present only if flag SSH_FILEXFER_ATTR_V3_ACMODTIME
* uint32 extended_count present only if flag SSH_FILEXFER_ATTR_EXTENDED
* string extended_type
* string extended_data
* ... more extended data (extended_type - extended_data pairs),
* so that number of pairs equals extended_count
*/
SFTPv3FileAttributes fa = new SFTPv3FileAttributes();
int flags = tr.readUINT32();
if ((flags & AttribFlags.SSH_FILEXFER_ATTR_SIZE) != 0)
{
if (debug != null)
debug.println("SSH_FILEXFER_ATTR_SIZE");
fa.size = new Long(tr.readUINT64());
}
if ((flags & AttribFlags.SSH_FILEXFER_ATTR_V3_UIDGID) != 0)
{
if (debug != null)
debug.println("SSH_FILEXFER_ATTR_V3_UIDGID");
fa.uid = new Integer(tr.readUINT32());
fa.gid = new Integer(tr.readUINT32());
}
if ((flags & AttribFlags.SSH_FILEXFER_ATTR_PERMISSIONS) != 0)
{
if (debug != null)
debug.println("SSH_FILEXFER_ATTR_PERMISSIONS");
fa.permissions = new Integer(tr.readUINT32());
}
if ((flags & AttribFlags.SSH_FILEXFER_ATTR_V3_ACMODTIME) != 0)
{
if (debug != null)
debug.println("SSH_FILEXFER_ATTR_V3_ACMODTIME");
fa.atime = new Integer(tr.readUINT32());
fa.mtime = new Integer(tr.readUINT32());
}
if ((flags & AttribFlags.SSH_FILEXFER_ATTR_EXTENDED) != 0)
{
int count = tr.readUINT32();
if (debug != null)
debug.println("SSH_FILEXFER_ATTR_EXTENDED (" + count + ")");
/* Read it anyway to detect corrupt packets */
while (count > 0)
{
tr.readByteString();
tr.readByteString();
count--;
}
}
return fa;
}
/**
* Retrieve the file attributes of an open file.
*
* @param handle a SFTPv3FileHandle handle.
* @return a SFTPv3FileAttributes object.
* @throws IOException
*/
public SFTPv3FileAttributes fstat(SFTPv3FileHandle handle) throws IOException
{
checkHandleValidAndOpen(handle);
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(handle.fileHandle, 0, handle.fileHandle.length);
if (debug != null)
{
debug.println("Sending SSH_FXP_FSTAT...");
debug.flush();
}
sendMessage(Packet.SSH_FXP_FSTAT, req_id, tw.getBytes());
byte[] resp = receiveMessage(34000);
if (debug != null)
{
debug.println("Got REPLY.");
debug.flush();
}
TypesReader tr = new TypesReader(resp);
int t = tr.readByte();
int rep_id = tr.readUINT32();
if (rep_id != req_id)
throw new IOException("The server sent an invalid id field.");
if (t == Packet.SSH_FXP_ATTRS)
{
return readAttrs(tr);
}
if (t != Packet.SSH_FXP_STATUS)
throw new IOException("The SFTP server sent an unexpected packet type (" + t + ")");
int errorCode = tr.readUINT32();
throw new SFTPException(tr.readString(), errorCode);
}
private SFTPv3FileAttributes statBoth(String path, int statMethod) throws IOException
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(path, charsetName);
if (debug != null)
{
debug.println("Sending SSH_FXP_STAT/SSH_FXP_LSTAT...");
debug.flush();
}
sendMessage(statMethod, req_id, tw.getBytes());
byte[] resp = receiveMessage(34000);
if (debug != null)
{
debug.println("Got REPLY.");
debug.flush();
}
TypesReader tr = new TypesReader(resp);
int t = tr.readByte();
int rep_id = tr.readUINT32();
if (rep_id != req_id)
throw new IOException("The server sent an invalid id field.");
if (t == Packet.SSH_FXP_ATTRS)
{
return readAttrs(tr);
}
if (t != Packet.SSH_FXP_STATUS)
throw new IOException("The SFTP server sent an unexpected packet type (" + t + ")");
int errorCode = tr.readUINT32();
throw new SFTPException(tr.readString(), errorCode);
}
/**
* Retrieve the file attributes of a file. This method
* follows symbolic links on the server.
*
* @see #lstat(String)
*
* @param path See the {@link SFTPv3Client comment} for the class for more details.
* @return a SFTPv3FileAttributes object.
* @throws IOException
*/
public SFTPv3FileAttributes stat(String path) throws IOException
{
return statBoth(path, Packet.SSH_FXP_STAT);
}
/**
* Retrieve the file attributes of a file. This method
* does NOT follow symbolic links on the server.
*
* @see #stat(String)
*
* @param path See the {@link SFTPv3Client comment} for the class for more details.
* @return a SFTPv3FileAttributes object.
* @throws IOException
*/
public SFTPv3FileAttributes lstat(String path) throws IOException
{
return statBoth(path, Packet.SSH_FXP_LSTAT);
}
/**
* Read the target of a symbolic link.
*
* @param path See the {@link SFTPv3Client comment} for the class for more details.
* @return The target of the link.
* @throws IOException
*/
public String readLink(String path) throws IOException
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(path, charsetName);
if (debug != null)
{
debug.println("Sending SSH_FXP_READLINK...");
debug.flush();
}
sendMessage(Packet.SSH_FXP_READLINK, req_id, tw.getBytes());
byte[] resp = receiveMessage(34000);
if (debug != null)
{
debug.println("Got REPLY.");
debug.flush();
}
TypesReader tr = new TypesReader(resp);
int t = tr.readByte();
int rep_id = tr.readUINT32();
if (rep_id != req_id)
throw new IOException("The server sent an invalid id field.");
if (t == Packet.SSH_FXP_NAME)
{
int count = tr.readUINT32();
if (count != 1)
throw new IOException("The server sent an invalid SSH_FXP_NAME packet.");
return tr.readString(charsetName);
}
if (t != Packet.SSH_FXP_STATUS)
throw new IOException("The SFTP server sent an unexpected packet type (" + t + ")");
int errorCode = tr.readUINT32();
throw new SFTPException(tr.readString(), errorCode);
}
private void expectStatusOKMessage(int id) throws IOException
{
byte[] resp = receiveMessage(34000);
if (debug != null)
{
debug.println("Got REPLY.");
debug.flush();
}
TypesReader tr = new TypesReader(resp);
int t = tr.readByte();
int rep_id = tr.readUINT32();
if (rep_id != id)
throw new IOException("The server sent an invalid id field.");
if (t != Packet.SSH_FXP_STATUS)
throw new IOException("The SFTP server sent an unexpected packet type (" + t + ")");
int errorCode = tr.readUINT32();
if (errorCode == ErrorCodes.SSH_FX_OK)
return;
throw new SFTPException(tr.readString(), errorCode);
}
/**
* Modify the attributes of a file. Used for operations such as changing
* the ownership, permissions or access times, as well as for truncating a file.
*
* @param path See the {@link SFTPv3Client comment} for the class for more details.
* @param attr A SFTPv3FileAttributes object. Specifies the modifications to be
* made to the attributes of the file. Empty fields will be ignored.
* @throws IOException
*/
public void setstat(String path, SFTPv3FileAttributes attr) throws IOException
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(path, charsetName);
tw.writeBytes(createAttrs(attr));
if (debug != null)
{
debug.println("Sending SSH_FXP_SETSTAT...");
debug.flush();
}
sendMessage(Packet.SSH_FXP_SETSTAT, req_id, tw.getBytes());
expectStatusOKMessage(req_id);
}
/**
* Modify the attributes of a file. Used for operations such as changing
* the ownership, permissions or access times, as well as for truncating a file.
*
* @param handle a SFTPv3FileHandle handle
* @param attr A SFTPv3FileAttributes object. Specifies the modifications to be
* made to the attributes of the file. Empty fields will be ignored.
* @throws IOException
*/
public void fsetstat(SFTPv3FileHandle handle, SFTPv3FileAttributes attr) throws IOException
{
checkHandleValidAndOpen(handle);
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(handle.fileHandle, 0, handle.fileHandle.length);
tw.writeBytes(createAttrs(attr));
if (debug != null)
{
debug.println("Sending SSH_FXP_FSETSTAT...");
debug.flush();
}
sendMessage(Packet.SSH_FXP_FSETSTAT, req_id, tw.getBytes());
expectStatusOKMessage(req_id);
}
/**
* Create a symbolic link on the server. Creates a link "src" that points
* to "target".
*
* @param src See the {@link SFTPv3Client comment} for the class for more details.
* @param target See the {@link SFTPv3Client comment} for the class for more details.
* @throws IOException
*/
public void createSymlink(String src, String target) throws IOException
{
int req_id = generateNextRequestID();
/* Either I am too stupid to understand the SFTP draft
* or the OpenSSH guys changed the semantics of src and target.
*/
TypesWriter tw = new TypesWriter();
tw.writeString(target, charsetName);
tw.writeString(src, charsetName);
if (debug != null)
{
debug.println("Sending SSH_FXP_SYMLINK...");
debug.flush();
}
sendMessage(Packet.SSH_FXP_SYMLINK, req_id, tw.getBytes());
expectStatusOKMessage(req_id);
}
/**
* Have the server canonicalize any given path name to an absolute path.
* This is useful for converting path names containing ".." components or
* relative pathnames without a leading slash into absolute paths.
*
* @param path See the {@link SFTPv3Client comment} for the class for more details.
* @return An absolute path.
* @throws IOException
*/
public String canonicalPath(String path) throws IOException
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(path, charsetName);
if (debug != null)
{
debug.println("Sending SSH_FXP_REALPATH...");
debug.flush();
}
sendMessage(Packet.SSH_FXP_REALPATH, req_id, tw.getBytes());
byte[] resp = receiveMessage(34000);
if (debug != null)
{
debug.println("Got REPLY.");
debug.flush();
}
TypesReader tr = new TypesReader(resp);
int t = tr.readByte();
int rep_id = tr.readUINT32();
if (rep_id != req_id)
throw new IOException("The server sent an invalid id field.");
if (t == Packet.SSH_FXP_NAME)
{
int count = tr.readUINT32();
if (count != 1)
throw new IOException("The server sent an invalid SSH_FXP_NAME packet.");
return tr.readString(charsetName);
}
if (t != Packet.SSH_FXP_STATUS)
throw new IOException("The SFTP server sent an unexpected packet type (" + t + ")");
int errorCode = tr.readUINT32();
throw new SFTPException(tr.readString(), errorCode);
}
private final Vector scanDirectory(byte[] handle) throws IOException
{
Vector files = new Vector();
while (true)
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(handle, 0, handle.length);
if (debug != null)
{
debug.println("Sending SSH_FXP_READDIR...");
debug.flush();
}
sendMessage(Packet.SSH_FXP_READDIR, req_id, tw.getBytes());
/* Some servers send here a packet with size > 34000 */
/* To whom it may concern: please learn to read the specs. */
byte[] resp = receiveMessage(65536);
if (debug != null)
{
debug.println("Got REPLY.");
debug.flush();
}
TypesReader tr = new TypesReader(resp);
int t = tr.readByte();
int rep_id = tr.readUINT32();
if (rep_id != req_id)
throw new IOException("The server sent an invalid id field.");
if (t == Packet.SSH_FXP_NAME)
{
int count = tr.readUINT32();
if (debug != null)
debug.println("Parsing " + count + " name entries...");
while (count > 0)
{
SFTPv3DirectoryEntry dirEnt = new SFTPv3DirectoryEntry();
dirEnt.filename = tr.readString(charsetName);
dirEnt.longEntry = tr.readString(charsetName);
dirEnt.attributes = readAttrs(tr);
files.addElement(dirEnt);
if (debug != null)
debug.println("File: '" + dirEnt.filename + "'");
count--;
}
continue;
}
if (t != Packet.SSH_FXP_STATUS)
throw new IOException("The SFTP server sent an unexpected packet type (" + t + ")");
int errorCode = tr.readUINT32();
if (errorCode == ErrorCodes.SSH_FX_EOF)
return files;
throw new SFTPException(tr.readString(), errorCode);
}
}
private final byte[] openDirectory(String path) throws IOException
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(path, charsetName);
if (debug != null)
{
debug.println("Sending SSH_FXP_OPENDIR...");
debug.flush();
}
sendMessage(Packet.SSH_FXP_OPENDIR, req_id, tw.getBytes());
byte[] resp = receiveMessage(34000);
TypesReader tr = new TypesReader(resp);
int t = tr.readByte();
int rep_id = tr.readUINT32();
if (rep_id != req_id)
throw new IOException("The server sent an invalid id field.");
if (t == Packet.SSH_FXP_HANDLE)
{
if (debug != null)
{
debug.println("Got SSH_FXP_HANDLE.");
debug.flush();
}
byte[] handle = tr.readByteString();
return handle;
}
if (t != Packet.SSH_FXP_STATUS)
throw new IOException("The SFTP server sent an unexpected packet type (" + t + ")");
int errorCode = tr.readUINT32();
String errorMessage = tr.readString();
throw new SFTPException(errorMessage, errorCode);
}
private final String expandString(byte[] b, int off, int len)
{
StringBuffer sb = new StringBuffer();
for (int i = 0; i < len; i++)
{
int c = b[off + i] & 0xff;
if ((c >= 32) && (c <= 126))
{
sb.append((char) c);
}
else
{
sb.append("{0x" + Integer.toHexString(c) + "}");
}
}
return sb.toString();
}
private void init() throws IOException
{
/* Send SSH_FXP_INIT (version 3) */
final int client_version = 3;
if (debug != null)
debug.println("Sending SSH_FXP_INIT (" + client_version + ")...");
TypesWriter tw = new TypesWriter();
tw.writeUINT32(client_version);
sendMessage(Packet.SSH_FXP_INIT, 0, tw.getBytes());
/* Receive SSH_FXP_VERSION */
if (debug != null)
debug.println("Waiting for SSH_FXP_VERSION...");
TypesReader tr = new TypesReader(receiveMessage(34000)); /* Should be enough for any reasonable server */
int type = tr.readByte();
if (type != Packet.SSH_FXP_VERSION)
{
throw new IOException("The server did not send a SSH_FXP_VERSION packet (got " + type + ")");
}
protocol_version = tr.readUINT32();
if (debug != null)
debug.println("SSH_FXP_VERSION: protocol_version = " + protocol_version);
if (protocol_version != 3)
throw new IOException("Server version " + protocol_version + " is currently not supported");
/* Read and save extensions (if any) for later use */
while (tr.remain() != 0)
{
String name = tr.readString();
byte[] value = tr.readByteString();
server_extensions.put(name, value);
if (debug != null)
debug.println("SSH_FXP_VERSION: extension: " + name + " = '" + expandString(value, 0, value.length)
+ "'");
}
}
/**
* Returns the negotiated SFTP protocol version between the client and the server.
*
* @return SFTP protocol version, i.e., "3".
*
*/
public int getProtocolVersion()
{
return protocol_version;
}
/**
* Close this SFTP session. NEVER forget to call this method to free up
* resources - even if you got an exception from one of the other methods.
* Sometimes these other methods may throw an exception, saying that the
* underlying channel is closed (this can happen, e.g., if the other server
* sent a close message.) However, as long as you have not called the
* close() method, you are likely wasting resources.
*
*/
public void close()
{
sess.close();
}
/**
* List the contents of a directory.
*
* @param dirName See the {@link SFTPv3Client comment} for the class for more details.
* @return A Vector containing {@link SFTPv3DirectoryEntry} objects.
* @throws IOException
*/
public Vector ls(String dirName) throws IOException
{
byte[] handle = openDirectory(dirName);
Vector result = scanDirectory(handle);
closeHandle(handle);
return result;
}
/**
* Create a new directory.
*
* @param dirName See the {@link SFTPv3Client comment} for the class for more details.
* @param posixPermissions the permissions for this directory, e.g., "0700" (remember that
* this is octal noation). The server will likely apply a umask.
*
* @throws IOException
*/
public void mkdir(String dirName, int posixPermissions) throws IOException
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(dirName, charsetName);
tw.writeUINT32(AttribFlags.SSH_FILEXFER_ATTR_PERMISSIONS);
tw.writeUINT32(posixPermissions);
sendMessage(Packet.SSH_FXP_MKDIR, req_id, tw.getBytes());
expectStatusOKMessage(req_id);
}
/**
* Remove a file.
*
* @param fileName See the {@link SFTPv3Client comment} for the class for more details.
* @throws IOException
*/
public void rm(String fileName) throws IOException
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(fileName, charsetName);
sendMessage(Packet.SSH_FXP_REMOVE, req_id, tw.getBytes());
expectStatusOKMessage(req_id);
}
/**
* Remove an empty directory.
*
* @param dirName See the {@link SFTPv3Client comment} for the class for more details.
* @throws IOException
*/
public void rmdir(String dirName) throws IOException
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(dirName, charsetName);
sendMessage(Packet.SSH_FXP_RMDIR, req_id, tw.getBytes());
expectStatusOKMessage(req_id);
}
/**
* Move a file or directory.
*
* @param oldPath See the {@link SFTPv3Client comment} for the class for more details.
* @param newPath See the {@link SFTPv3Client comment} for the class for more details.
* @throws IOException
*/
public void mv(String oldPath, String newPath) throws IOException
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(oldPath, charsetName);
tw.writeString(newPath, charsetName);
sendMessage(Packet.SSH_FXP_RENAME, req_id, tw.getBytes());
expectStatusOKMessage(req_id);
}
/**
* Open a file for reading.
*
* @param fileName See the {@link SFTPv3Client comment} for the class for more details.
* @return a SFTPv3FileHandle handle
* @throws IOException
*/
public SFTPv3FileHandle openFileRO(String fileName) throws IOException
{
return openFile(fileName, 0x00000001, null); // SSH_FXF_READ
}
/**
* Open a file for reading and writing.
*
* @param fileName See the {@link SFTPv3Client comment} for the class for more details.
* @return a SFTPv3FileHandle handle
* @throws IOException
*/
public SFTPv3FileHandle openFileRW(String fileName) throws IOException
{
return openFile(fileName, 0x00000003, null); // SSH_FXF_READ | SSH_FXF_WRITE
}
// Append is broken (already in the specification, because there is no way to
// send a write operation (what offset to use??))
// public SFTPv3FileHandle openFileRWAppend(String fileName) throws IOException
// {
// return openFile(fileName, 0x00000007, null); // SSH_FXF_READ | SSH_FXF_WRITE | SSH_FXF_APPEND
// }
/**
* Create a file and open it for reading and writing.
* Same as {@link #createFile(String, SFTPv3FileAttributes) createFile(fileName, null)}.
*
* @param fileName See the {@link SFTPv3Client comment} for the class for more details.
* @return a SFTPv3FileHandle handle
* @throws IOException
*/
public SFTPv3FileHandle createFile(String fileName) throws IOException
{
return createFile(fileName, null);
}
/**
* Create a file and open it for reading and writing.
* You can specify the default attributes of the file (the server may or may
* not respect your wishes).
*
* @param fileName See the {@link SFTPv3Client comment} for the class for more details.
* @param attr may be null to use server defaults. Probably only
* the uid, gid and permissions
* (remember the server may apply a umask) entries of the {@link SFTPv3FileHandle}
* structure make sense. You need only to set those fields where you want
* to override the server's defaults.
* @return a SFTPv3FileHandle handle
* @throws IOException
*/
public SFTPv3FileHandle createFile(String fileName, SFTPv3FileAttributes attr) throws IOException
{
return openFile(fileName, 0x00000008 | 0x00000003, attr); // SSH_FXF_CREAT | SSH_FXF_READ | SSH_FXF_WRITE
}
/**
* Create a file (truncate it if it already exists) and open it for reading and writing.
* Same as {@link #createFileTruncate(String, SFTPv3FileAttributes) createFileTruncate(fileName, null)}.
*
* @param fileName See the {@link SFTPv3Client comment} for the class for more details.
* @return a SFTPv3FileHandle handle
* @throws IOException
*/
public SFTPv3FileHandle createFileTruncate(String fileName) throws IOException
{
return createFileTruncate(fileName, null);
}
/**
* reate a file (truncate it if it already exists) and open it for reading and writing.
* You can specify the default attributes of the file (the server may or may
* not respect your wishes).
*
* @param fileName See the {@link SFTPv3Client comment} for the class for more details.
* @param attr may be null to use server defaults. Probably only
* the uid, gid and permissions
* (remember the server may apply a umask) entries of the {@link SFTPv3FileHandle}
* structure make sense. You need only to set those fields where you want
* to override the server's defaults.
* @return a SFTPv3FileHandle handle
* @throws IOException
*/
public SFTPv3FileHandle createFileTruncate(String fileName, SFTPv3FileAttributes attr) throws IOException
{
return openFile(fileName, 0x00000018 | 0x00000003, attr); // SSH_FXF_CREAT | SSH_FXF_TRUNC | SSH_FXF_READ | SSH_FXF_WRITE
}
private byte[] createAttrs(SFTPv3FileAttributes attr)
{
TypesWriter tw = new TypesWriter();
int attrFlags = 0;
if (attr == null)
{
tw.writeUINT32(0);
}
else
{
if (attr.size != null)
attrFlags = attrFlags | AttribFlags.SSH_FILEXFER_ATTR_SIZE;
if ((attr.uid != null) && (attr.gid != null))
attrFlags = attrFlags | AttribFlags.SSH_FILEXFER_ATTR_V3_UIDGID;
if (attr.permissions != null)
attrFlags = attrFlags | AttribFlags.SSH_FILEXFER_ATTR_PERMISSIONS;
if ((attr.atime != null) && (attr.mtime != null))
attrFlags = attrFlags | AttribFlags.SSH_FILEXFER_ATTR_V3_ACMODTIME;
tw.writeUINT32(attrFlags);
if (attr.size != null)
tw.writeUINT64(attr.size.longValue());
if ((attr.uid != null) && (attr.gid != null))
{
tw.writeUINT32(attr.uid.intValue());
tw.writeUINT32(attr.gid.intValue());
}
if (attr.permissions != null)
tw.writeUINT32(attr.permissions.intValue());
if ((attr.atime != null) && (attr.mtime != null))
{
tw.writeUINT32(attr.atime.intValue());
tw.writeUINT32(attr.mtime.intValue());
}
}
return tw.getBytes();
}
private SFTPv3FileHandle openFile(String fileName, int flags, SFTPv3FileAttributes attr) throws IOException
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(fileName, charsetName);
tw.writeUINT32(flags);
tw.writeBytes(createAttrs(attr));
if (debug != null)
{
debug.println("Sending SSH_FXP_OPEN...");
debug.flush();
}
sendMessage(Packet.SSH_FXP_OPEN, req_id, tw.getBytes());
byte[] resp = receiveMessage(34000);
TypesReader tr = new TypesReader(resp);
int t = tr.readByte();
int rep_id = tr.readUINT32();
if (rep_id != req_id)
throw new IOException("The server sent an invalid id field.");
if (t == Packet.SSH_FXP_HANDLE)
{
if (debug != null)
{
debug.println("Got SSH_FXP_HANDLE.");
debug.flush();
}
return new SFTPv3FileHandle(this, tr.readByteString());
}
if (t != Packet.SSH_FXP_STATUS)
throw new IOException("The SFTP server sent an unexpected packet type (" + t + ")");
int errorCode = tr.readUINT32();
String errorMessage = tr.readString();
throw new SFTPException(errorMessage, errorCode);
}
/**
* Read bytes from a file. No more than 32768 bytes may be read at once.
* Be aware that the semantics of read() are different than for Java streams.
*
*
* - The server will read as many bytes as it can from the file (up to
len),
* and return them.
* - If EOF is encountered before reading any data,
-1 is returned.
* - If an error occurs, an exception is thrown
.
* - For normal disk files, it is guaranteed that the server will return the specified
* number of bytes, or up to end of file. For, e.g., device files this may return
* fewer bytes than requested.
*
*
* @param handle a SFTPv3FileHandle handle
* @param fileOffset offset (in bytes) in the file
* @param dst the destination byte array
* @param dstoff offset in the destination byte array
* @param len how many bytes to read, 0 < len <= 32768 bytes
* @return the number of bytes that could be read, may be less than requested if
* the end of the file is reached, -1 is returned in case of EOF
* @throws IOException
*/
public int read(SFTPv3FileHandle handle, long fileOffset, byte[] dst, int dstoff, int len) throws IOException
{
checkHandleValidAndOpen(handle);
if ((len > 32768) || (len <= 0))
throw new IllegalArgumentException("invalid len argument");
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(handle.fileHandle, 0, handle.fileHandle.length);
tw.writeUINT64(fileOffset);
tw.writeUINT32(len);
if (debug != null)
{
debug.println("Sending SSH_FXP_READ...");
debug.flush();
}
sendMessage(Packet.SSH_FXP_READ, req_id, tw.getBytes());
byte[] resp = receiveMessage(34000);
TypesReader tr = new TypesReader(resp);
int t = tr.readByte();
int rep_id = tr.readUINT32();
if (rep_id != req_id)
throw new IOException("The server sent an invalid id field.");
if (t == Packet.SSH_FXP_DATA)
{
if (debug != null)
{
debug.println("Got SSH_FXP_DATA...");
debug.flush();
}
int readLen = tr.readUINT32();
if ((readLen < 0) || (readLen > len))
throw new IOException("The server sent an invalid length field.");
tr.readBytes(dst, dstoff, readLen);
return readLen;
}
if (t != Packet.SSH_FXP_STATUS)
throw new IOException("The SFTP server sent an unexpected packet type (" + t + ")");
int errorCode = tr.readUINT32();
if (errorCode == ErrorCodes.SSH_FX_EOF)
{
if (debug != null)
{
debug.println("Got SSH_FX_EOF.");
debug.flush();
}
return -1;
}
String errorMessage = tr.readString();
throw new SFTPException(errorMessage, errorCode);
}
/**
* Write bytes to a file. If len > 32768, then the write operation will
* be split into multiple writes.
*
* @param handle a SFTPv3FileHandle handle.
* @param fileOffset offset (in bytes) in the file.
* @param src the source byte array.
* @param srcoff offset in the source byte array.
* @param len how many bytes to write.
* @throws IOException
*/
public void write(SFTPv3FileHandle handle, long fileOffset, byte[] src, int srcoff, int len) throws IOException
{
checkHandleValidAndOpen(handle);
while (len > 0)
{
int writeRequestLen = len;
if (writeRequestLen > 32768)
writeRequestLen = 32768;
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(handle.fileHandle, 0, handle.fileHandle.length);
tw.writeUINT64(fileOffset);
tw.writeString(src, srcoff, writeRequestLen);
if (debug != null)
{
debug.println("Sending SSH_FXP_WRITE...");
debug.flush();
}
sendMessage(Packet.SSH_FXP_WRITE, req_id, tw.getBytes());
fileOffset += writeRequestLen;
srcoff += writeRequestLen;
len -= writeRequestLen;
byte[] resp = receiveMessage(34000);
TypesReader tr = new TypesReader(resp);
int t = tr.readByte();
int rep_id = tr.readUINT32();
if (rep_id != req_id)
throw new IOException("The server sent an invalid id field.");
if (t != Packet.SSH_FXP_STATUS)
throw new IOException("The SFTP server sent an unexpected packet type (" + t + ")");
int errorCode = tr.readUINT32();
if (errorCode == ErrorCodes.SSH_FX_OK)
continue;
String errorMessage = tr.readString();
throw new SFTPException(errorMessage, errorCode);
}
}
/**
* Close a file.
*
* @param handle a SFTPv3FileHandle handle
* @throws IOException
*/
public void closeFile(SFTPv3FileHandle handle) throws IOException
{
if (handle == null)
throw new IllegalArgumentException("the handle argument may not be null");
try
{
if (handle.isClosed == false)
{
closeHandle(handle.fileHandle);
}
}
finally
{
handle.isClosed = true;
}
}
}