📄 what_is_inetd.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><head> <title></title> <link rel="stylesheet" media="screen" type="text/css" href="./style.css" /> <link rel="stylesheet" media="screen" type="text/css" href="./design.css" /> <link rel="stylesheet" media="print" type="text/css" href="./print.css" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><a href=start.html>start</a></br><h2><a name="what_is_inetd" id="what_is_inetd">What is inetd ?</a></h2><div class="level2"><p> This is a user code program that sets up and monitors a number of ports on a system. </p><p>When an external system tries to establish communications with such a system it first contacts the <strong>inetd</strong> manager program. This manager program can then redirect the network traffic to a special handler program designated for the specific network port.</p><p>The task of linking ports to programs is conducted by a configuration file <strong>/etc/inetd.conf</strong>.</p><p>Typical contents </p><pre class="code"># on the target systemroot:~> cat /etc/inetd.confftp stream tcp nowait root /bin/ftpd -ltelnet stream tcp nowait root /bin/telnetd</pre><p> The service is designated by name so you also need a file <strong>/etc/services</strong> to link the service name to the port and protocol.</p><pre class="code">oot:~> cat /etc/servicesftp 21/tcpftp 21/udpssh 22/tcpssh 22/udptelnet 23/tcptelnet 23/udpnameserver 42/tcp namenameserver 42/udp nametftp 69/tcptftp 69/udpfinger 79/tcpfinger 79/udphttp 80/tcp www www-httphttp 80/udp www www-httpkerberos 88/tcp kerberos5 krb5kerberos 88/udp kerberos5 krb5hostname 101/tcp hostnameshostname 101/udp hostnamesshell 514/tcp cmdshell 514/udp cmd</pre><p>The <strong>/etc/inetd.conf</strong> file is often generated automatically during the system build.</p><p>The <strong>user/telnetd/Makefile</strong> shows this process.</p><p>During the <strong>make romfs</strong> part of the system build the correct entry is made into the <strong>/etc/inetd.conf</strong> file.</p><pre class="code"> romfs: $(ROMFSINST) /bin/$(EXEC) $(ROMFSINST) -e CONFIG_USER_TELNETD_TELNETD \ -a "telnet stream tcp nowait root /bin/telnetd" /etc/inetd.conf</pre></div></body></html>⌨️ 快捷键说明
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