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9.6. The inetd Super-Server

Inetd(常被称为“网络超级服务”)是一个服务器服务。它按需求运行一些不常用的服务,而且不需要连续运行。
The /etc/inetd.conf file lists these servers and their usual ports. The inetd command listens to all of them; when it detects a connection to any such port, it executes the corresponding server program.
Each significant line of the /etc/inetd.conf file describes a server through seven fields (separated by spaces):
下面的例子阐释最常见的情况:

例 9.1. 摘自 /etc/inetd.conf

talk   dgram  udp wait    nobody.tty /usr/sbin/in.talkd in.talkd
finger stream tcp nowait  nobody     /usr/sbin/tcpd     in.fingerd
ident  stream tcp nowait  nobody     /usr/sbin/identd   identd -i
The tcpd program is frequently used in the /etc/inetd.conf file. It allows limiting incoming connections by applying access control rules, documented in the hosts_access(5) manual page, and which are configured in the /etc/hosts.allow and /etc/hosts.deny files. Once it has been determined that the connection is authorized, tcpd executes the real server (like in.fingerd in our example). It is worth noting that tcpd relies on the name under which it was invoked (that is the first argument, argv[0]) to identify the real program to run. So you should not start the arguments list with tcpd but with the program that must be wrapped.