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Table 23-3: ProFTPD Daemon Startup Options Description Use description, including options. Runs the proftpd process in standalone mode (must also specify standalone as ServerType in the configuration file). Display ProFTPD version number. Sets proftpd's internal debug level (1-5). Specifies alternate configuration file. Disables (0) or enables (1) the default persistent password support, which is determined at configure time for each platform (see PersistentPasswd directive).

The following command would disable proftpd:

In this section the rst style remote control is used to test all the sensors of the robot while moving it around with the remote controller. This will help in understanding how the robot sees its environment. We will combine the keyboard and mouse as a remote controller. Study the program code to see how this is done. Essentially, without considering the mouse, the remote controller is similar to what we developed in Fig. 4.1. You saw in Chap. 3 that the robot has many sensors. The program in Fig. 4.6 will show the status of many of these sensors while the robot moves around. Using this program you can maneuver the robot over lines and in the vicinity of obstacles and observe how all the sensors are affected (see Fig. 4.7). This can help in understanding what the robot sees and can be very valuable while developing algorithms that use sensors to allow the robot to move autonomously. The program will not be discussed in detail. Many of the techniques used in it will be seen in programs in future chapters and will be discussed then. However, do notice the way the display text is formatted to appear appealing on the screen. Also notice the use of the string manipulation functions Instring(), Length(), and sRepeat() and how the function Bin() is used to convert a number to its binary representation.

If you want to run proftpd as an xinetd process, you first must change the ServerType to inetd and disable the proftpd startup script in the /etc/rc.d/inet.d directory. To run ProFTPD from xinetd, make sure to create an appropriate file for it in the /etc/xinetd.d directory. Currently, the proftpd inetd RPM package implements an in.proftpd link to the proftpd daemon. Use this link to invoke ProFTPD in the ProFTPD xinetd file. A simple ProFTPD xinetd file, named proftpd, would look like this:

service proftp { socket_type wait user server disable }

= = = = =

4.5 Summary

Use the chkconfig command with the off and on arguments to disable or enable proftpd running under xinetd.

ProFTPD uses only one configuration file, named proftpd.conf, located in the /etc directory. Configuration entries take the form of directives. This format is purposely modeled on Apache configuration directives. With the directives, you can enter basic configuration information, such as your server name, or perform more complex operations, such as implementing virtual FTP hosts. The design is flexible enough to enable you to define configuration features for particular directories, users, or groups. To configure a particular directory, you can use an .ftpaccess file with configuration options placed within that directory. These .ftpaccess options take precedence over those in the proftpd.conf directory. .fptaccess files are designed to operate like .htaccess files in the Apache Web server that configure particular Web site directories. You can find a complete listing of ProFTPD configuration parameters at the ProFTPD Web site (www.proftpd.net) and in the ProFTPD documentation installed in /usr/doc as part of the ProFTPD software package. Several of the more commonly used parameters are listed in Table 23-4. When creating a new configuration, you should make a copy of the proftpd.conf configuration file and modify it. Then you can test its syntax using the proftpd command with the -c option and the name of the file. Table 23-4: ProFTPD Configuration Directives, proftpd.conf

Description Response message sent to an FTP client indicating the user has logged in or anonymous access has been granted. The magic cookie '%u' is replaced with the username specified by the client.Default: Dependent on login typeContext: server config, VirtualHost, Anonymous, Global Used inside a Limit context to specify explicitly which hosts and/or networks have access to the commands or operations being limited. Used with Order and Deny to create access control rules. Default: Allow from all Context: Limit Allows access to a Directory, Anonymous or Limit block Default: Default is to implicitly AllowAll, but not explicitly Context: Directory, Anonymous, Limit, .ftpaccess