I have two problems with SFTP that I can not chase down. I hope you can help
me by looking at the server log, because I could not get a simple working
example yet.
The first problem is a big one. The content of a file gets deleted if the
user has no write permission and he tries to write. I used break points to
find where the content gets deleted, but could not find it.
*Step 1)* FileZilla: Open/Edit file
*Step 2)* Edi the file. Save the file. Upload the file.
*Step 3)* Server LOG:
[pool-2-thread-3] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Read 80
bytes
[pool-2-thread-3] DEBUG org.apache.sshd.server.channel.ChannelSession -
Received SSH_MSG_CHANNEL_DATA on channel ChannelSession[id=0, recipient=256]
[Thread-3] DEBUG org.apache.sshd.server.sftp.SftpSubsystem - Received
SSH_FXP_REALPATH (path=/test/test.txt)
[Thread-3] DEBUG org.apache.sshd.server.channel.ChannelSession - Send
SSH_MSG_CHANNEL_DATA on channel 0
[Thread-3] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Writing 176
bytes
[pool-2-thread-4] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Read 96
bytes
[pool-2-thread-4] DEBUG org.apache.sshd.server.channel.ChannelSession -
Received SSH_MSG_CHANNEL_DATA on channel ChannelSession[id=0, recipient=256]
[pool-2-thread-5] DEBUG org.apache.sshd.common.io.nio2.Nio2Session -
Finished writing
[Thread-3] DEBUG org.apache.sshd.server.sftp.SftpSubsystem - Received
SSH_FXP_OPEN (path=/test/test.txt, pflags=26, attrs={})
[Thread-3] DEBUG org.apache.sshd.server.channel.ChannelSession - Send
SSH_MSG_CHANNEL_DATA on channel 0
[Thread-3] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Writing 112
bytes
[pool-2-thread-1] DEBUG org.apache.sshd.common.io.nio2.Nio2Session -
Finished writing
[pool-2-thread-2] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Read
128 bytes
[pool-2-thread-2] DEBUG org.apache.sshd.server.channel.ChannelSession -
Received SSH_MSG_CHANNEL_DATA on channel ChannelSession[id=0, recipient=256]
[Thread-3] DEBUG org.apache.sshd.server.sftp.SftpSubsystem - Received
SSH_FXP_WRITE (handle=cc0e88bc-c028-45b1-aa55-f01787135b61, offset=0,
data=byte[8])
[Thread-3] INFO sftp.filesystem.SshFtpFile - Checking authorization for
/test/test.txt
[Thread-3] INFO sftp.filesystem.SshFtpFile - Not authorized
[Thread-3] DEBUG org.apache.sshd.server.sftp.SftpSubsystem - Send
SSH_FXP_STATUS (substatus=4, msg=No write permission : test.txt)
[Thread-3] DEBUG org.apache.sshd.server.channel.ChannelSession - Send
SSH_MSG_CHANNEL_DATA on channel 0
[Thread-3] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Writing 128
bytes
*Step 4)* Break point at following method:
SshFtpFile.createOutputStream(...)
{
// File is already empty!
// Then it checks write permission
if( isWritable() )
{...}
}
The second problem is an IOException thrown when the connection is closed
normally. No further problems occur. Only this message in the logs. What is
the issue?
*Step 1)* Normal disconnect from FileZilla or closing the server.
*Step 2)* Server LOG:
[pool-2-thread-3] DEBUG org.apache.sshd.server.channel.ChannelSession -
Received SSH_MSG_CHANNEL_DATA on channel
ChannelSession[id=0, recipient=256]
[Thread-2] DEBUG org.apache.sshd.server.sftp.SftpSubsystem - Received
SSH_FXP_READDIR (handle=cc0370bd-5173-40ce-b1a9-
6c5d68bc05dd)
[Thread-2] DEBUG org.apache.sshd.server.sftp.SftpSubsystem - Send
SSH_FXP_STATUS (substatus=1, msg=)
[Thread-2] DEBUG org.apache.sshd.server.channel.ChannelSession - Send
SSH_MSG_CHANNEL_DATA on channel 0
[Thread-2] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Writing 96
bytes
[pool-2-thread-4] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Read
112 bytes
[pool-2-thread-1] DEBUG org.apache.sshd.common.io.nio2.Nio2Session -
Finished writing
[pool-2-thread-4] DEBUG org.apache.sshd.server.channel.ChannelSession -
Received SSH_MSG_CHANNEL_DATA on channel
ChannelSession[id=0, recipient=256]
[Thread-2] DEBUG org.apache.sshd.server.sftp.SftpSubsystem - Received
SSH_FXP_CLOSE (handle=cc0370bd-5173-40ce-b1a9-
6c5d68bc05dd)
[Thread-2] DEBUG org.apache.sshd.server.sftp.SftpSubsystem - Send
SSH_FXP_STATUS (substatus=0, msg=)
[Thread-2] DEBUG org.apache.sshd.server.channel.ChannelSession - Send
SSH_MSG_CHANNEL_DATA on channel 0
[Thread-2] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Writing 96
bytes
[pool-2-thread-2] DEBUG org.apache.sshd.common.io.nio2.Nio2Session -
Finished writing
[pool-2-thread-3] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Caught
exception, now calling handler
[pool-2-thread-3] WARN org.apache.sshd.server.session.ServerSession -
Exception caught
java.io.IOException: Der angegebene Netzwerkname ist nicht mehr verfügbar.
at sun.nio.ch.Iocp.translateErrorToIOException(Unknown Source)
at sun.nio.ch.Iocp.access$700(Unknown Source)
at sun.nio.ch.Iocp$EventHandlerTask.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
*Translation:
"java.io.IOException: The specified network name is no longer available."
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