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Replied: "cskinner@bml.ca (Chris K. Skinner) www@freebsd.org"
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From: cskinner@bml.ca (Chris K. Skinner)
To: www@freebsd.org
Subject: FTP server definite bug!
Date: Thu, 23 May 1996 21:22:00 GMT
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Hi.  Greetings.  Discovered something weird...

Bug title:  FTP server gets and obeys an mput of "." and ".."
 special files from a "stupid" LAN FTP client.

Config:		
  Server: January CD of FreeBSD 2.1.0 from Walnut Creek.
  Client: the MS-Windows for Workgroups 3.11 Beta 1.1(?) of
          Microsoft TCP/IP-32.

Scenario:  

1. Within a MS WFW 3.11 system, login as a valid
   unix user (Ethernet Lan connection between machines).
2. Change local Win3.11 directory to a directory with a 
   bunch of www html, gif, jpg files to send to the 
   unix host as a test of MS tcp/ip-32 FTP.
3. Set prompting off so that no interactive "y/n ?" pause
   message appear within MS tcp/ip-32 when doing "mput".
4. Change remote FreeBSD unix directory to user's home
   directory.
5. Make a temporary unix directory to hold the files
   that will be up-loaded via MS-tcp/ip-32 ftp to the 
   unix user sub-directory.
6. Change into this temporary directory for doing the
   upload.
7. Perform a "mput *.*" command so that Win3.11 sends files
   to unix.
8. Witness that the Win3.11 FTP will attempt to send both
   the "." and ".." files, and the unix machine will 
   have its "." and ".." directory entries corrupted.
9. Perform a "fsck" command on the unix machine to detect
   and correct the corruption created by the steps above.

The unix fsck reports and corrects the directory entry
corruption of the "." and ".." directory entries that
were screwed up by the "stupid" client ftp software.

Thanks for reading this.  Regards, Chris K. Skinner.