I'm using Jsch 0.1.44 for SFTP and have run into some interesting behavior.
I believe there is an issue with the handling of unix socket files by JSCH.
When doing a listing of a directory that contains a socket file, the file comes
back as a directory rather than a file. I'm not sure this is entirely
inaccurate because the socket file is technically both a file and a directory
when looking at the permission flags set on the file.
root@red-linux:/var/run/mysqld# ls -l
total 0
drwxrwxrwx 2 mysql mysql 40 2012-09-07 14:54 directory
-rwxrwxrwx 1 mysql mysql 0 2012-09-07 14:54 file
srwxrwxrwx 1 mysql mysql 0 2012-03-01 15:19 mysqld.sock
root@red-linux:/var/run/mysqld#
If you have mysql installed on a linux box (I'm using Ubuntu), you can navigate
to /var/run/mysqld directory and find a socket file, represented by an 's' in
the first permission place. I created a directory and a file in that folder and
ran a list with the jsch code on that directory. By debugging, I found that
the following permissions were returned back for each file type in that
directory.
File Type Unix Perm Int Perm Octal Perm Binary Perm
--------- --------- -------- ---------- -----------
directory drwxrwxrwx 16895 040777 0100000111111111
file -rwxrwxrwx 33279 100777 1000000111111111
socket file srwxrwxrwx 49663 140777 1100000111111111
Notice how the socket file has both the file and directory bits set. JSCH has
the SftpATTRS.isDir() check which checks ((permissions & S_IFDIR) == S_IFDIR).
This is returning true but I believe this should be returning false for this
particular file type. I'm not the expert in SFTP nor Unix file types, so I
wanted to send this out for discussion. The issue would come up for certain
application that need to recursively traverse directories. The applications
using JSCH will run into an issue when a socket file is encountered, as it will
see the file as a directory and try to navigate into that file, which fails.
I've done some comparisons with FileZilla and it represents the object as a
file.
I'm curious if anyone has run into this before and whether or not an
enhancement can be made to return this file type as a file, not a directory?
Regards,
E R I C K L I C H T A S
Linoma Software
Senior Software Engineer
p. 402.944.4242 x714
f. 402.944.4243
www.LinomaSoftware.com<http://www.linomasoftware.com/>
www.GoAnywhereMFT.com<http://www.goanywheremft.com/>
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