com.hierynomus.mssmb2.SMBApiException: STATUS_OTHER (0xffffffff): Cannot resolve path

[cliviu]

Hi, I have the following exception:
2018-12-14 16:38:04,408|DFSPathResolver |INFO |Starting DFS resolution for \host1.com\Share\Resource
2018-12-14 16:38:04,408|ProxySocketFactory |DEBUG|Connecting to \host1.com\Share:445
2018-12-14 16:38:04,424|Connection |INFO |Closed connection to \host1.com\Share
2018-12-14 16:38:04,424|SMBClient |DEBUG|Connection to << \host1.com\Share:445 >> closed
|ERROR|FileCopy:STATUS_OTHER (0xffffffff): Cannot resolve path \host1.com\Share\Resource
com.hierynomus.mssmb2.SMBApiException: STATUS_OTHER (0xffffffff): Cannot resolve path \host1.com\Share\Resource
at com.hierynomus.smbj.share.DiskShare.resolveAndCreateFile(DiskShare.java:81)
at com.hierynomus.smbj.share.DiskShare.open(DiskShare.java:66)
at com.hierynomus.smbj.share.DiskShare.exists(DiskShare.java:187)
at com.hierynomus.smbj.share.DiskShare.folderExists(DiskShare.java:183)
...
at java.lang.Thread.run(Thread.java:748)
Caused by: com.hierynomus.msdfsc.DFSException: java.net.UnknownHostException: \host1.com\Share
at com.hierynomus.smbj.paths.DFSPathResolver.sendDfsReferralRequest(DFSPathResolver.java:397)
at com.hierynomus.smbj.paths.DFSPathResolver.step9(DFSPathResolver.java:306)
at com.hierynomus.smbj.paths.DFSPathResolver.step2(DFSPathResolver.java:140)
at com.hierynomus.smbj.paths.DFSPathResolver.step1(DFSPathResolver.java:120)
at com.hierynomus.smbj.paths.DFSPathResolver.resolve(DFSPathResolver.java:107)
at com.hierynomus.smbj.paths.DFSPathResolver.resolve(DFSPathResolver.java:95)
at com.hierynomus.smbj.share.DiskShare.resolveAndCreateFile(DiskShare.java:77)
... 9 more

in DfsPathResolver, Line 395, there is a TODO:
connection = oldConnection.getClient().connect(hostName); // TODO

Does it ring any bells ?

The strange thing is that two minutes before, the same resolution was successful.
2018-12-14 16:36:04,533|DFSPathResolver |INFO |Starting DFS resolution for \host1.com\Share\Resource
2018-12-14 16:36:04,533|DFSPathResolver |INFO |DFS resolved\host1.com\Share\Resource -> \host2.com\Share$\Test...

Thanks,
Liviu

[cliviu]

Apparently, the name resolution works always if there is a gap of about 10 minutes between calls.

[hierynomus]

The cached referral has expired in your case (see: DFSPathResolver#140). Will dig into that.

[cliviu]

Thanks !!

[Disablez]

Same problem here.

[vjorge]

Hi, facing the same issue.
Anyone can share a workaround?
I have an ISO file that needs to be kept open for random read, and after +-15 minutes it throws the exact same error above.
Using the latest code.
Many thanks,

[vjorge]

Hi I found what is causing the issue:
The function sendDfsReferralRequest, is expecting the hostName as a string with the server name, but instead the functions
stepX and passing the hostname with the format " \\host1.com\Share"

Then in function sendDfsReferralRequest it triggers the condition:

if (!hostName.equals(session.getConnection().getRemoteHostname())) {

Because the provided hostName is a UNC path not the host FQDN thus causing the error:

Caused by: com.hierynomus.msdfsc.DFSException: java.net.UnknownHostException: \host1.com\Share

I have not found what is causing the hostName to be passed with the format " \host1.com\Share"

@hierynomus can you please help with this?

private ReferralResult sendDfsReferralRequest(DfsRequestType type, String hostName, Session session, DFSPath path) throws DFSException {
        // The client MUST initiate a server session with the SMB server, as specified in [MS-CIFS] section 3.4.4.7,
        // by passing HostName and UserCredentials as input parameters and receiving an opaque ClientGenericContext,
        // as specified in [MS-CIFS] section 3.4.
        // The client MUST search for an existing Session and TreeConnect to any share on the server identified by
        // ServerName for the user identified by UserCredentials. If no Session and TreeConnect are found, the client
        // MUST establish a new Session and TreeConnect to IPC$ on the target server as described in section 3.2.4.2
        // using the supplied ServerName and UserCredentials
        Session dfsSession = session;
        if (!hostName.equals(session.getConnection().getRemoteHostname())) {
            AuthenticationContext auth = session.getAuthenticationContext();
            Connection oldConnection = session.getConnection();
            Connection connection;
            try {
                connection = oldConnection.getClient().connect(hostName); // TODO
            } catch (IOException e) {
                throw new DFSException(e);
            }
            dfsSession = connection.authenticate(auth);
        }

        try {
            Share dfsShare = dfsSession.connectShare("IPC$"); // explicitly not closed as we want to re-use the cached Share for multiple requests
            return getReferral(type, dfsShare, path);
        } catch (Buffer.BufferException | IOException e) {
            throw new DFSException(e);
        }
    }

[vjorge]

Found the issue:

In function step9,
ReferralResult result = sendDfsReferralRequest(DfsRequestType.LINK, rootReferralCacheEntry.getTargetHint().getTargetPath(), session, state.path);

the call:

rootReferralCacheEntry.getTargetHint().getTargetPath()

returns a UNC path, not a FQDN hostname .

Adding a simple validation and translation fixed the issue.

        String target = rootReferralCacheEntry.getTargetHint().getTargetPath();
        if (target.startsWith("\\")) {
        	target = SmbPath.parse(target).getHostname();
        }

I believe the correct way to fix it is to create a field in the ReferalCacheEntry that also allows to return the Hostname instead of the

@SuppressWarnings("PMD.UnusedFormalParameter")
private <T> T step9(Session session, ResolveState<T> state, ReferralCache.ReferralCacheEntry lookup) throws DFSException {
    logger.trace("DFS[9]: {}", state);
    DFSPath rootPath = new DFSPath(state.path.getPathComponents().subList(0, 2));
    ReferralCache.ReferralCacheEntry rootReferralCacheEntry = referralCache.lookup(rootPath);
    if (rootReferralCacheEntry == null) {
        logger.debug("Could not find referral cache entry for {}", rootPath);
        referralCache.clear(state.path);
        return step1(session, state);
    }

    String target = rootReferralCacheEntry.getTargetHint().getTargetPath();
    if (target.startsWith("\\")) {
    	target = SmbPath.parse(target).getHostname();
    }
    
   // ReferralResult result = sendDfsReferralRequest(DfsRequestType.LINK, rootReferralCacheEntry.getTargetHint().getTargetPath(), session, state.path);
    ReferralResult result = sendDfsReferralRequest(DfsRequestType.LINK, target, session, state.path);
    if (!NtStatus.isSuccess(result.status)) {
        return step14(session, state, result);
    }

    if (result.referralCacheEntry.isRoot()) {
        return step3(session, state, result.referralCacheEntry);
    }

    return step4(session, state, result.referralCacheEntry);
}

[vjorge]

Seems that found the issue:

The problem is with function step9 in :

ReferralResult result = sendDfsReferralRequest(DfsRequestType.LINK, rootReferralCacheEntry.getTargetHint().getTargetPath(), session, state.path);

The call rootReferralCacheEntry.getTargetHint().getTargetPath() return a UNCPath not a FQDN hostname, but the sendDfsReferralRequest expects a FQDN Hostname, thus causing the connection to fail.

Bellow is the changed function that works, but I believe the correct way to fix it is to have a field named hostName in ReferralCache that returns the server hostname, and use it instead of the getTargetPath().

private <T> T step9(Session session, ResolveState<T> state, ReferralCache.ReferralCacheEntry lookup) throws DFSException {
     logger.trace("DFS[9]: {}", state);
     DFSPath rootPath = new DFSPath(state.path.getPathComponents().subList(0, 2));
     ReferralCache.ReferralCacheEntry rootReferralCacheEntry = referralCache.lookup(rootPath);
     if (rootReferralCacheEntry == null) {
         logger.debug("Could not find referral cache entry for {}", rootPath);
         referralCache.clear(state.path);
         return step1(session, state);
     }
     
     /*
      * Alterado por mim, porque existe um bug ou falha no codigo que passa o unc em vez do hostname
      */
     String target = rootReferralCacheEntry.getTargetHint().getTargetPath();
     if (target.startsWith("\\")) {
     	target = SmbPath.parse(target).getHostname();
     }
     
    // ReferralResult result = sendDfsReferralRequest(DfsRequestType.LINK, rootReferralCacheEntry.getTargetHint().getTargetPath(), session, state.path);
     ReferralResult result = sendDfsReferralRequest(DfsRequestType.LINK, target, session, state.path);
     if (!NtStatus.isSuccess(result.status)) {
         return step14(session, state, result);
     }

     if (result.referralCacheEntry.isRoot()) {
         return step3(session, state, result.referralCacheEntry);
     }

     return step4(session, state, result.referralCacheEntry);
 }

[hierynomus]

Can you test with the fix in #722? I've changed the implementation slightly.

[vjorge]

Hi hierynomus,
Many thanks for your update.
Seems that now its fixed ;) It works great.
Thank very much.
Vitor

[hierynomus]

Merged #722