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https://issues.apache.org/jira/browse/SSHD-733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15941023#comment-15941023
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Piotr Praszmo commented on SSHD-733:
------------------------------------
I'm having similar (probably the same) issue:
{code}
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Collections;
import org.apache.sshd.client.SshClient;
import org.apache.sshd.client.session.ClientSession;
import org.apache.sshd.client.subsystem.sftp.SftpClient;
import org.apache.sshd.client.subsystem.sftp.SftpClient.CloseableHandle;
import org.apache.sshd.client.subsystem.sftp.SftpClient.DirEntry;
import org.apache.sshd.common.file.virtualfs.VirtualFileSystemFactory;
import org.apache.sshd.server.SshServer;
import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
import org.apache.sshd.server.subsystem.sftp.SftpSubsystemFactory;
public class Main {
private static final String USERNAME = "my username";
private static final String PASSWORD = "my password";
public static void main(final String[] args) throws Exception {
Files.delete(Paths.get("my_link"));
final Path link =
Files.createSymbolicLink(Paths.get("my_link"), Paths.get("/")).toAbsolutePath();
final SshServer server = SshServer.setUpDefaultServer();
server.setHost("localhost");
server.setPort(0);
server.setKeyPairProvider(new SimpleGeneratorHostKeyProvider());
server.setPasswordAuthenticator(
(username, password, session) ->
USERNAME.equals(username) && PASSWORD.equals(password));
server.setSubsystemFactories(Collections.singletonList(new
SftpSubsystemFactory()));
server.setFileSystemFactory(new
VirtualFileSystemFactory(Paths.get("/")));
server.start();
System.out.println("openssh:");
test(22, link);
System.out.println("mina:");
test(server.getPort(), link);
}
private static void test(final int port, final Path path) throws
IOException {
try (final SshClient client = SshClient.setUpDefaultClient()) {
client.setHostConfigEntryResolver((h, p, u) -> null);
client.start();
try (ClientSession session = client.connect(USERNAME,
"localhost", port).verify().getSession()) {
session.addPasswordIdentity(PASSWORD);
session.auth().verify();
final SftpClient sftp =
session.createSftpClient();
try {
try (CloseableHandle dir =
sftp.openDir(path.toString())) {
for (final DirEntry entry :
sftp.listDir(dir)) {
System.out.print(entry.getFilename() + " ");
}
System.out.println();
}
} catch (final Exception e) {
e.printStackTrace();
}
}
}
}
}
{code}
Produces following output:
{code}
openssh:
vmlinuz libx32 usr srv sbin tmp lost+found dev initrd.img.old var etc home
media . opt initrd.img sys run proc lib root lib64 boot bin vmlinuz.old mnt
lib32 ..
mina:
SFTP error (SSH_FX_NOT_A_DIRECTORY): Internal NotDirectoryException:
/tmp/workspace/test/my_link
at
org.apache.sshd.client.subsystem.sftp.AbstractSftpClient.throwStatusException(AbstractSftpClient.java:169)
at
org.apache.sshd.client.subsystem.sftp.AbstractSftpClient.checkHandleResponse(AbstractSftpClient.java:204)
at
org.apache.sshd.client.subsystem.sftp.AbstractSftpClient.checkHandle(AbstractSftpClient.java:184)
at
org.apache.sshd.client.subsystem.sftp.AbstractSftpClient.openDir(AbstractSftpClient.java:853)
at test.Main.test(Main.java:57)
at test.Main.main(Main.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:282)
at java.lang.Thread.run(Thread.java:745)
{code}
`/tmp/workspace/test/my_link` is a symlink to directory (created at the start
of main).
On port 22 I'm running:
{code}
SSH-2.0-OpenSSH_7.4p1 Debian-6
{code}
OpenSSH lists the contents of symlinked directory while mina returns
SSH_FX_NOT_A_DIRECTORY.
The same behavior can be observer using different client (sftp).
I'm not sure which behavior is the correct one though.
> SSHD server displays file symlinks instead of dir symlinks
> ----------------------------------------------------------
>
> Key: SSHD-733
> URL: https://issues.apache.org/jira/browse/SSHD-733
> Project: MINA SSHD
> Issue Type: Wish
> Affects Versions: 1.2.0
> Environment: Windows/Linux
> Reporter: Marcin Kozakiewicz
> Priority: Minor
>
> We use sshd for junit testing of sftp file transfers.
> Scenario:
> 1.create filesystem:
> {code}
> ├── mem0
> │ └── mem0.txt
> ├── run -> mem0
> └── run2 -> mem0
> {code}
> 2. Start SSh server with given file system.
> code snippet from out project:
> {code}
> _server = SshServer.setUpDefaultServer();
> _server.setHost("localhost");
> _server.setPort(PORT);
> _server.setKeyPairProvider(new SimpleGeneratorHostKeyProvider());
> _server.setPasswordAuthenticator(new PasswordAuthenticator() {
> @Override
> public boolean authenticate(final String username, final String
> password, final ServerSession session) {
> return USERNAME.equals(username) && PASSWORD.equals(password);
> }
> });
> _server.setSubsystemFactories(singletonList(new
> SftpSubsystemFactory()));
> _server.setFileSystemFactory(new
> VirtualFileSystemFactory(fileSystemPath));
> _server.start();
> {code}
> 3. Connect to server with sftp client.
> Result:
> run and run2 symlinks are presented as file symlinks instead of directory
> symlinks.
> Expected result:
> run and run2 are presented as directory symlinks.
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