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<body bgcolor=#ffffff><title>Internet Services</title><center><img src="images/inetd.gif"></center><br><h2><i>This help page is incomplete</i></h2><hr><h3>Introduction</h3>This module allows you to manage and setup internet services such as<tt>telnet</tt>, <tt>ftp</tt> and <tt>finger</tt>. Every internet servicehas a name, port number and protocol (such as <tt>telnet</tt> on<tt>tcp</tt> port 23). Many services also have a server program to handlenetwork connections to that services. <p>Services with an associated program are controlled by the Unix <tt>inetd</tt> daemon, which listens for network connections on behalf ofall its services. When a connection is received, the server program isstarted to handle data from the new connection. <p>Not all internet services are managed by this module. Servers that receivemany connections such as HTTPD, SMB or NFS are run separately to avoidhaving to start a new process for each request. These services can beconfigured using other Webmin modules, such as <a href=/samba/>Samba</a>or <a href=/apache/>Apache</a>. <p>The main page for this module lists all the internet and RPC serviceson your system. Services with a program assigned are displayed in bold.The list of internet services, RPC services and programs are taken fromthe files <tt>/etc/services</tt>, <tt>/etc/rpc</tt> and <tt>/etc/inetd.conf</tt>. <p><hr><h3>Creating a New Service</h3>To create a new internet service, click on the <tt>Create New Service</tt>link below the list of active services. This will take you to a formin which the details of the new service can be entered : <ul> <li><b>Service Name</b><br> Every service must have a unique name and protocol pair. This means that two services can have the same name only if they use different protocols. <p> <li><b>Protocol</b><br> The communications protocol used by this service. Almost all internet services use the <tt>TCP</tt> protocol, and the rest use <tt>UDP</tt>. <p> <li><b>Port</b><br> Every service has a port number which must be unique within the protocol used by the service. The port number must be between 0 and 65535 for both <tt>TCP</tt> and <tt>UDP</tt>. <p> <li><b>Aliases</b><br> A list of alternative names used to refer to this service. An alias cannot be already used as the name or alias of an existing service with the same protocol. <p> </ul><p>Internet service names can be used instead of hostnames in commandssuch as <tt>telnet</tt>. For example, you can type <tt>telnet foo.bar.com smtp</tt> to connect to port 25 on the host <tt>foo.bar.com</tt>, assumingthe <tt>smtp</tt> internet service is defined correctly. <p>For services with an associated program, you must choose the <tt>Use theprogram below</tt> option ??? <ul> <li><b>Program</b><br> Some rare services are handled internally by <tt>inetd</tt>. However, for almost all new services that you create the full path to the program to execute for the service should be given here. <p> <li><b>Arguments</b><br> Command line arguments to pass to the program above. The first argument should be the program name, and the rest other parameters to pass. <p> <li><b>Wait mode</b><br> This determines if <tt>inetd</tt> will wait until the program is complete before starting any others or not. For most services, this should be <tt>Don't wait</tt>. <p> <li><b>Execute as</b><br> The username of the user the server program should be run as. Most servers will need to be run as <tt>root</tt>. <p> </ul><p>When a new service is added, it will not take effect immediately. You mustclick the <tt>Restart Inetd</tt> button on the main page for the additionto be applied. <p><hr><h3>Editing an Existing Service</h3>To edit a service, click on the service name from the list on the main page.This will display the same form used for creating a service to allow youto edit the service details. You can also click on the <tt>Delete</tt>button at the bottom of the page to delete the service. <p>Be careful when editing or deleting existing system services such as<tt>telnet</tt> or <tt>ftp</tt>. Changing these may make it impossibleto login to your machine (or worse). <p>When a service is modified, it will not take effect immediately. You mustclick the <tt>Restart Inetd</tt> button on the main page for the changesto be applied. <p><hr><h3>Creating and Editing RPC Programs</h3>In general, you will never need to create or edit RPC programs on yoursystem. However, if you do the procedure is similar to creating andediting internet services. <p> The form for editing and creating RPC programs will always contain atleast the following fields : <ul> <li><b>Program Name</b><br> A unique name for this RPC program (within the same protocol). <p> <li><b>Number</b><br> Every RPC program has a unique program number, determined when the program is written. <p> <li><b>Aliases</b><br> Other names that can be used to refer to this RPC program. <p> </ul><p>Some operating systems (such as Solaris) allow a server program to beassociated with an RPC service. This program will be run by <tt>inetd</tt>when it receives a request for the program. <p>If your system supports RPC server programs started by inetd, the followingfields will also be visible : <ul> <li>??? </ul> <hr><a href="/"><img alt="<-" align=middle border=0 src=/images/left.gif></a> <a href="">Return to module</a><p> ⌨️ 快捷键说明
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