Web site optimization - system gmu address news.groucho.edu time Any port tcp-conn
system gmu address news.groucho.edu time Any port tcp-conn chat ogin: vstout word: clouseau The address command gives the IP address of the host or its fully qualified domain name. The corresponding port entry would read: port tcp-conn type tcp service 540 The entry states that a TCP connection should be used when a sys entry references tcp-conn, and that uucico should attempt to connect to the TCP network port 540 on the remote host. This is the default port number of the UUCP service. Instead of the port number, you may also give a symbolic port name to the service command. The port number corresponding to this name will be looked up in /etc/services. The common name for the UUCP service is uucpd. Using a Direct Connection Assume you use a direct line to connect your system vstout to tiny. Much like in the modem case, you have to write a system entry in the sys file. The port command identifies the serial port tiny is hooked up to: system tiny time Any port direct1 speed 38400 chat ogin: cathcart word: catch22 In the port file, you have to describe the serial port for the direct connection. A dialer entry is not needed because there’s no need for dialing: port direct1 type direct speed 38400 device /dev/ttyS1 Controlling Access to UUCP Features UUCP is quite a flexible system. With that flexibility comes a need to carefully control access to its features to prevent abuse, whether it be intentional or accidental. The primary features of concern to the UUCP administrator are remote command execution, file transfer, and forwarding. Taylor UUCP provides a means of limiting the freedom that remote UUCP hosts have in exercising each of these features. With careful selection of permissions, the UUCP administrator can ensure that the host’s security is preserved. Command Execution UUCP’s task is to copy files from one system to another and to request execution of certain commands on remote hosts. Of course, you as an administrator would want to control what rights you grant other systems — allowing them to execute any command they choose on your system is definitely not a good idea. By default, the only commands Taylor UUCP allows other systems to execute on your machine are rmail and rnews, which are commonly used to exchange email and Usenet News over UUCP. To change the set of commands for a particular system, you can use the commands keyword in the sys file. Similarly, you may want to limit the search path to just those directories containing the allowed commands. You can change the search path allowed for a remote host with the command-path statement. For instance, you may want to allow system pablo to execute the bsmtp command in addition to rmail and rnews:99 system pablo … bsmtp is used to deliver mail with batched SMTP.