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Mac OS X comes with a Apple File Protocol (AFP) server which is closed source and unavailable for PureDarwin. Hence, if you would like to use PureDarwin as a file, print and time server for Macintosh computers, you need to use netatalk, a third-party, open source implementation of the AppleTalk suite of protocols. It allows PureDarwin to act as an AFP server and can act as a Time Machine server similar to Apple's Time Capsule. This page describes how to install and configure netatalk on PureDarwin.

Installing netatalk on PureDarwin

netatalk can be installed from MacPorts. Execute the following command to start it, and to cause it to launch at startup:
sudo launchctl load -w /Library/LaunchDaemons/org.macports.netatalk.plist
This, among other things, launches /opt/local/sbin/afpd, which is netatalk's AFP server.
From this moment on, you should be able to connect to your server from any mac using afp://servername or afp:// (using your server's IP adress). 

Configuring netatalk

After installation, you will be unable to log in. Instead, you will get a message that the username/password is wrong, and /opt/local/var/log/netatalk.log shows 
[uams_dhx_pam.c:497]: I:UAMSDaemon: uams_dhx_pam.c :PAM: PAM_Error: Authentication failure

This can be fixed by creating the file /etc/pam.d/netatalk with the following content:
auth       required
auth       sufficient
auth       sufficient
auth       required
account    required
password   required
session    required

Now you should be able to log in using your username and password, and should be able to access your files. See MacPorts #23313

By default, every user can access his home directory. Note however that every user can mark other areas he has (read) access to as shared, including the entire hard disk. All he has to do is create a file .AppleVolumes in his home directory with the following content:
# Export the entire hard disk
/ "/"
Is it possible to disallow users from this?

Announcing to Bonjour (mDNSResponder)

This section is about announcing the server on the local network, so that it shows up in the Finder:

On the Mac, the AppleFileServer is launched and announced on the local network via Bonjour using the following LaunchDaemons plist file. We would like to do the same with netatalk, but we are running into problems...

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "">
<plist version="1.0">

This tells launchd to announce the AFP server on the local network with Bonjour and launch the AFP server whenever the "afpovertcp" port is accessed. The file /etc/services contains the definition that this equals port 548. 

If we copy the bold part from above into the netatalk LaunchDaemon plist, then netatalk gets announced on the local network as a server (i.e., it shows up automatically on the left-hand side in Finder), but we get
E:AFPDaemon: main: dsi_init: Address already in use
in the syslog and cannot connect to the server because afpd can't start.

Please let us know what to do. See MacPorts #23315. According to the maintainer, this has been discussed upstream. As of January 2010, there is a proposal for a possible solution, which might be included in some future Netatalk release.

As a workaround, you can edit /opt/local/etc/netatalk/initscript so that it starts and stops dns-sd. While this is not elegant, it does work at least. Insert the three bold lines into /opt/local/etc/netatalk/initscript:

dns-sd -R . _afpovertcp._tcp . 548 &
printf " Done.\n"
    kill $CNID_PID
DNS_SD_PID=`ps aux | grep -v awk | awk '/^root.*afpovertcp/ {print $2}'`
    kill DNS_SD_PID

Reload with
sudo launchctl unload -w /Library/LaunchDaemons/org.macports.netatalk.plist
sudo launchctl load -w /Library/LaunchDaemons/org.macports.netatalk.plist

Now you should see your PureDarwin server in the Finder of the Macs in your local network and should be able to connect and log in using the server username and password.