Error reading input stream when reading WinSCP Session.GetFile stream from another thread

user_14012751 0
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I'm getting this strange error; been debugging for a while and I think the problem is that I am streaming a ghost file from a nonsense site.

Take a look, this is the error message:

Error: Error: WinSCP.SessionRemoteException: Copying files from remote side failed. Error reading input stream. in WinSCP.OperationResultBase.Check() in WinSCP.Session.PutFile(Stream stream, String remoteFilePath, TransferOptions options)

I'm trying to get the latest file from this site: /origin/path/interfaces, copy that file and paste it in a different server, specifically in this location: /destination/path/interfaces

Everything seems to be working, I am getting the latest file but something looks strange to me:

It seems it is reading the file from here: /origin/path/interfaces/TXTFILES202104101700.txt (in the first session) but it is strange because I cannot access a file by specifying the name of the file in the site, I can only do this: /origin/path/interfaces/.

I guess the error comes because it is trying to paste a ghost file into the new server, it is "reading" from this location /origin/path/interfaces/TXTFILES202104101700.txt. I cannot specify a file within the route, just this: /origin/path/interfaces/

This is my code:

// Sessions options
SessionOptions SftpSource = new SessionOptions
{
    Protocol = Protocol.Sftp,
    HostName = xxxxxxxxxxxxx,
    xxxxxxxx = xxxxxxxxxxxxx,
    xxxxxxxx = xxxxxxxxxxxxx,
    xxxxxxxx = xxxxxxxxxxxxx,
    xxxxxxxx = xxxxxxxxxxxxx
};

SessionOptions SftpDestination = new SessionOptions
{
    Protocol = Protocol.Sftp,
    HostName = xxxxxxxxxxxxx,
    xxxxxxxx = xxxxxxxxxxxxx,
    xxxxxxxx = xxxxxxxxxxxxx,
    xxxxxxxx = xxxxxxxxxxxxx,
    xxxxxxxx = xxxxxxxxxxxxx
};

using (Session sftpSessionServer1 = new Session())
using (Session SftpSessionServer2 = new Session())
{
    // Connecting to SFTP first server
    sftpSessionServer1.Open(SftpSource);

    // Get list of files in the SFTP directory
    string SftpRemoteDirectory = "/origin/path/interfaces";
    RemoteDirectoryInfo directoryInfo = sftpSessionServer1.ListDirectory(SftpRemoteDirectory);

    // Select the most recent file
    RemoteFileInfo ultimateFile =
        directoryInfo.Files
            .Where(file => !file.IsDirectory)
            .OrderByDescending(file => file.LastWriteTime)
            .First();

    // Connecting to SFTP second server
    SftpSessionServer2.Open(SftpDestination);

    string sSftpRemoteDirectory = "/destination/path/interfaces";
    string sftpRemotePath = RemotePath.Combine(sSftpRemoteDirectory, ultimateFile.Name);

    // Transfer from SFTP to SFTP
    using (Stream downloadStream = sftpSessionServer1.GetFile(ultimateFile.FullName))
    {
        SftpSessionServer2.PutFile(downloadStream, sftpRemotePath);
    }
}

Logs from both sessions:

First session:

< 2021-04-18 03:35:59.731 Script: -rw-r--r--   1 myuser  oinstall   1609790 Apr 10 22:56:27 2021 TXTFILES202104101700.txt
< 2021-04-18 03:35:59.731 Script: -rw-r--r--   1 myuser  oinstall       435 Feb 12 17:10:58 2021 TXTFILES202102121710.txt
< 2021-04-18 03:35:59.731 Script: -rw-r--r--   1 myuser  oinstall   3722440 Apr 12 10:48:20 2018 TXTFILES20180412.txt
< 2021-04-18 03:35:59.731 Script: -rw-r--r--   1 myuser  oinstall    890092 Dec 20 10:58:54 2018 TXTFILES20181220.txt
> 2021-04-18 03:36:04.032 Script: get  -nopermissions -preservetime -transfer="binary" -onlyfile -- "/origin/path/interfaces/TXTFILES202104101700.txt" "-"
. 2021-04-18 03:36:04.033 Listing file "/origin/path/interfaces/TXTFILES202104101700.txt".
> 2021-04-18 03:36:04.033 Type: SSH_FXP_LSTAT, Size: 68, Number: 1543
< 2021-04-18 03:36:04.049 Type: SSH_FXP_STATUS, Size: 24, Number: 1284
. 2021-04-18 03:36:04.049 Discarding reserved response
< 2021-04-18 03:36:04.059 Type: SSH_FXP_ATTRS, Size: 37, Number: 1543
. 2021-04-18 03:36:04.059 TXTFILES202104101700.txt;-;1609790;2021-04-11T01:56:27.000Z;3;"" [501];"" [503];rw-r--r--;0
. 2021-04-18 03:36:04.059 Copying 1 files/directories to local directory "" - total size: 1.609.790
. 2021-04-18 03:36:04.059   PrTime: Yes; PrRO: No; Rght: rw-r--r--; PrR: No (No); FnCs: N; RIC: 0100; Resume: S (102400); CalcS: No; Mask: *.*
. 2021-04-18 03:36:04.059   TM: B; ClAr: No; RemEOF: No; RemBOM: No; CPS: 0; NewerOnly: No; EncryptNewFiles: Yes; ExcludeHiddenFiles: No; ExcludeEmptyDirectories: No; InclM: ; ResumeL: 0
. 2021-04-18 03:36:04.059   AscM: *.*html; *.htm; *.txt; *.php; *.php3; *.cgi; *.c; *.cpp; *.h; *.pas; *.bas; *.tex; *.pl; *.js; .htaccess; *.xtml; *.css; *.cfg; *.ini; *.sh; *.xml
. 2021-04-18 03:36:04.060 File: '/origin/path/interfaces/TXTFILES202104101700.txt' [2021-04-11T01:56:27.000Z] [1609790]
. 2021-04-18 03:36:04.060 Streaming "/origin/path/interfaces/TXTFILES202104101700.txt" to local machine started.
. 2021-04-18 03:36:04.060 Binary transfer mode selected.
. 2021-04-18 03:36:04.060 Opening remote file.
> 2021-04-18 03:36:04.060 Type: SSH_FXP_OPEN, Size: 76, Number: 1795
< 2021-04-18 03:36:04.073 Type: SSH_FXP_HANDLE, Size: 13, Number: 1795
> 2021-04-18 03:36:04.073 Type: SSH_FXP_FSTAT, Size: 13, Number: 2056
< 2021-04-18 03:36:04.085 Type: SSH_FXP_ATTRS, Size: 37, Number: 2056
> 2021-04-18 03:36:04.085 Type: SSH_FXP_READ, Size: 25, Number: 2309
< 2021-04-18 03:36:04.930 Status code: 1
. 2021-04-18 03:36:04.930 132 skipped SSH_FXP_WRITE, SSH_FXP_READ, SSH_FXP_DATA and SSH_FXP_STATUS packets.
> 2021-04-18 03:36:04.930 Type: SSH_FXP_CLOSE, Size: 13, Number: 23300
< 2021-04-18 03:36:04.930 Type: SSH_FXP_STATUS, Size: 28, Number: 15365
< 2021-04-18 03:36:04.930 Type: SSH_FXP_STATUS, Size: 28, Number: 15621
< 2021-04-18 03:36:04.930 Type: SSH_FXP_STATUS, Size: 28, Number: 15877
< 2021-04-18 03:36:04.930 Type: SSH_FXP_STATUS, Size: 28, Number: 16133
< 2021-04-18 03:36:04.930 Type: SSH_FXP_STATUS, Size: 28, Number: 16389
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 16645
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 16901
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 17157
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 17413
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 17669
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 17925
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 18181
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 18437
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 18693
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 18949
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 19205
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 19461
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 19717
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 19973
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 20229
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 20485
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 20741
< 2021-04-18 03:36:04.931 Type: SSH_FXP_STATUS, Size: 28, Number: 20997
< 2021-04-18 03:36:04.932 Type: SSH_FXP_STATUS, Size: 28, Number: 21253
< 2021-04-18 03:36:04.932 Type: SSH_FXP_STATUS, Size: 28, Number: 21509
< 2021-04-18 03:36:04.932 Type: SSH_FXP_STATUS, Size: 28, Number: 21765
< 2021-04-18 03:36:04.932 Type: SSH_FXP_STATUS, Size: 28, Number: 22021
< 2021-04-18 03:36:04.932 Type: SSH_FXP_STATUS, Size: 28, Number: 22277
< 2021-04-18 03:36:05.000 Type: SSH_FXP_STATUS, Size: 28, Number: 22533
< 2021-04-18 03:36:05.012 Type: SSH_FXP_STATUS, Size: 28, Number: 22789
< 2021-04-18 03:36:05.100 Type: SSH_FXP_STATUS, Size: 28, Number: 23045
. 2021-04-18 03:36:05.100 Transfer done: '/origin/path/interfaces/TXTFILES202104101700.txt' => '-' [1609790]
. 2021-04-18 03:36:05.101 Copying finished: Transferred: 1.609.790, Elapsed: 0:00:01, CPS: 1.684.869/s
> 2021-04-18 03:36:06.027 Script: exit
. 2021-04-18 03:36:06.028 Script: Exit code: 0
. 2021-04-18 03:36:06.028 Closing connection.
. 2021-04-18 03:36:06.028 Sending special code: 1
. 2021-04-18 03:36:06.040 Session sent command exit status 0
. 2021-04-18 03:36:06.040 Main session channel closed
. 2021-04-18 03:36:06.040 All channels closed

Second session:

"/origin/path/interfaces/TXTFILES202104101700.txt"
. 2021-04-18 03:36:04.244 Copying 1 files/directories to remote directory "/destination/path/interfaces/" - total size: 0
. 2021-04-18 03:36:04.244   PrTime: Yes; PrRO: No; Rght: rw-r--r--; PrR: No (No); FnCs: N; RIC: 0100; Resume: S (102400); CalcS: No; Mask: TXTFILES202104101700.txt
. 2021-04-18 03:36:04.244   TM: B; ClAr: No; RemEOF: No; RemBOM: No; CPS: 0; NewerOnly: No; EncryptNewFiles: Yes; ExcludeHiddenFiles: No; ExcludeEmptyDirectories: No; InclM: ; ResumeL: 0
. 2021-04-18 03:36:04.244   AscM: *.*html; *.htm; *.txt; *.php; *.php3; *.cgi; *.c; *.cpp; *.h; *.pas; *.bas; *.tex; *.pl; *.js; .htaccess; *.xtml; *.css; *.cfg; *.ini; *.sh; *.xml
. 2021-04-18 03:36:04.244 File: 'TXTFILES202104101700.txt' [n/a] [0]
. 2021-04-18 03:36:04.244 Streaming "TXTFILES202104101700.txt" to remote directory started.
. 2021-04-18 03:36:04.244 Binary transfer mode selected.
. 2021-04-18 03:36:04.244 Opening remote file.
> 2021-04-18 03:36:04.244 Type: SSH_FXP_OPEN, Size: 84, Number: 259
< 2021-04-18 03:36:04.301 Type: SSH_FXP_HANDLE, Size: 13, Number: 259
> 2021-04-18 03:36:04.321 Type: SSH_FXP_WRITE, Size: 32761, Number: 774
. 2021-04-18 03:36:05.446 53 skipped SSH_FXP_WRITE, SSH_FXP_READ, SSH_FXP_DATA and SSH_FXP_STATUS packets.
> 2021-04-18 03:36:05.446 Type: SSH_FXP_CLOSE, Size: 13, Number: 7684
< 2021-04-18 03:36:05.457 Type: SSH_FXP_STATUS, Size: 24, Number: 7684
< 2021-04-18 03:36:05.457 Status code: 0
> 2021-04-18 03:36:05.457 Type: SSH_FXP_REMOVE, Size: 68, Number: 7949
< 2021-04-18 03:36:05.469 Type: SSH_FXP_STATUS, Size: 24, Number: 7949
< 2021-04-18 03:36:05.469 Status code: 0
* 2021-04-18 03:36:05.469 (ECommand) **Copying files from remote side failed**
* 2021-04-18 03:36:05.469 Failure reading network stream.
. 2021-04-18 03:36:05.470 Script: Failed
> 2021-04-18 03:36:05.924 Script: exit
. 2021-04-18 03:36:05.925 Increasing send buffer from 262144 to 524288
. 2021-04-18 03:36:05.925 Script: Exit code: 1
. 2021-04-18 03:36:05.925 Closing connection.
. 2021-04-18 03:36:05.925 Sending special code: 1
. 2021-04-18 03:36:05.937 Session sent command exit status 0
. 2021-04-18 03:36:05.937 Main session channel closed
. 2021-04-18 03:36:05.937 All channels closed

How can I solve this? I'm kinda lost.

winscp-net winscp .net c#
1 Answers

Indeed, the there was a bug that prevented the code from to working.

Please upgrade to the latest version of WinSCP.

Before the fix was released, if the file is not too large, you could temporarily workaround it by copying the file to a memory buffer:

// Transfer from SFTP to SFTP
using (Stream downloadStream = sftpSessionServer1.GetFile(ultimateFile.FullName))
using (Stream memoryStream = new MemoryStream())
{
    downloadStream.CopyTo(memoryStream);
    memoryStream.Position = 0;
    SftpSessionServer2.PutFile(memoryStream, sftpRemotePath);
}

If the file is large, you will have to download it to a temporary local file before uploading it.

user_8508480
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