Hi, Sorry for my long long delay.
On Wed, Oct 21, 2015 at 5:22 PM, Kagoshima Data Application Co., Ltd.
T.Oohara <oohara.k...@dal.co.jp> wrote:
> Hello.
>
> We are using JSch library version 0.1.49 and we have a problem that the
> illegal data will get mixed into a file we sent.
>
> If we add the following configuration to Sftp.java, which is one of the
> examples included with jsch-0.1.49.zip, and send a file to the SFTP Server
> (Titan FTP server), then the result shows the file size is the same between
> the sent file and the received one, but we can find the contents of the two
> files are different if we compare the hash values retrieved from them.
> JSch.setConfig("mac.c2s", "hmac-sha2-256");
> JSch.setConfig("mac.s2c", "hmac-sha2-256");
>
> This problem always happens when we sent a file which size is more than 35840
> bytes. And we look into the received file, we found the data such as a header
> information "SSH_MSG_CHANNEL_DATA" always got mixed in with the file at every
> position of 35709 bytes (i.e. a size of data which JSch can send to the Titan
> SFTP Server in one time), we think this will cause the difference of the
> contents with the two files.
>
> And it seems that the following values have been set to
> "SSH_MSG_CHANNEL_OPEN_CONFIRMATION" from the SFTP Server:
> initial window size:16384
> maximum packet size:35840
>
>
> We found the same problem would occur with JSch-0.1.53, do you think this
> problem occurs due to a defect specific to JSch? And in that case, can you
> fix the defect with JSch version 0.1.49?
We have not been able to reproduce the reported problems,
but we have recognized the possibilities for such kind of problems.
Could you try the attached patch?
Sincerely,
--
Atsuhiko Yamanaka
JCraft,Inc.
1-14-20 HONCHO AOBA-KU,
SENDAI, MIYAGI 980-0014 Japan.
Tel +81-22-723-2150
Skype callto://jcraft/
Twitter: http://twitter.com/ymnk
Facebook: http://facebook.com/aymnk
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