An anonymous FTP
server has been
installed on netlib2.cs.utk.edu to provide anonymous FTP
access to the Netlib directory tree.
The Netlib anonymous FTP server is based on the Washington
University ftp daemon, which in turn is based on the 4.3-Reno BSD ftp
daemon. Minor modifications were necessary to get it to compile in a
vanilla SunOS environment. The server supports several useful
features including per-site, per-user, and per-directory access
control, extensive logging, automatic display of ``readme'' messages
when you cd to a particular directory, and automatic creation of
compressed and/or tarred versions of files and directories. (Just ask
for <filename>.Z instead of filename, or
<directory>.tar.Z instead of each
file in the directory, and it gets packaged up on-the-fly.)
In ``anonymous'' mode, ftp logs into the ``ftp'' account and changes its root directory to that account's home directory, so that it becomes impossible to access files outside of that directory. On netlib2, the ``ftp'' account's home directory is /netlib.
Configuration files are as follows:
/etc/ftpusers
This file contains a list of users (like "nobody") who are
not permitted to log in via ftp.
/usr/local/etc/ftpaccess
This file specifies who can use the ftp server
(you can create classes based on where someone logs in
from and who they say they are), how many members of each
class can log in at once, which files get printed out
when you cd to a particular directory, a message to be
displayed at login time, whether a class of user can
request auto compression or auto-tar, what kinds of things
can be logged, who can "upload" files, and where warning
messages get mailed.
See "man ftpaccess" for more information.
/usr/local/logs/ftpd.log
This is where transactions get logged.
There are other config files, detailing other features of ftp, but they are not used by the netlib implementation.
For more information, see the man pages for ftpaccess(5), ftpconversions(5), ftpcount(1), ftpd(8), ftphosts(5), ftpshut(8), ftpwho(1), and xferlog(5). (On netlib2, these man pages are installed in /usr/local/man; make sure your MANPATH environment variable contains /usr/local/man ahead of /usr/man).
Netlib's ftp server is installed in /usr/local/etc/ftpd. The Sun-supplied binary is in /usr/etc/in.ftpd; but the file /etc/inetd.conf has been changed to point to /usr/local/etc/ftpd.
A few other programs are also needed to make anonymous FTP work properly - special (statically-linked) versions of ls, compress, and (GNU) tar. These are installed on netlib2 in /netlib/bin. On netlib2 there is also a dummy /netlib/etc/passwd file, which contains dummy entries for root and ftp - with fake passwords. These are so that the output of ls -l can use meaningful user names rather than uid numbers.
The sources are in /usr/local/src/wu-ftpd-2.1a. There are some documentation files there that detail how to configure it. For these instructions see /usr/local/src/wu-ftpd-2.1a/INSTALL and /usr/local/src/wu-ftpd-2.1a/NOTES.