Configuring and Managing MPE/iX Internet Services > Chapter 2 Internet Daemon

Starting and Stopping inetd

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On the HP e3000, the instructions for starting the Internet daemon are contained in the job file JINETD.NET.SYS. When you stream JINETD, it invokes the daemon and reads the inetd configuration file to determine what services have been configured, and listens for connection requests for those services. Any messages relating to inetd are sent either to the console or to $STDLIST for JINETD, which is a spool file. The Internet daemon will continue to run, responding to requests for any of the configured services, until you stop it. The Internet daemon only terminates in an error state if there are no valid services listed in the configuration file.

Starting inetd From a Job

To start inetd, you stream the JINETD job. You may do this manually, by entering the STREAM command when the system is running, or you may include the STREAM JINETD command in the SYSSTART file to have inetd automatically started at system startup.

To start inetd manually:

Log onto your system as MANAGER.SYS,NET.
Check to make sure that inetd has not already been started by entering at the CI prompt:
:SHOWJOB JOB=@J
Look for the job logged on as JINETD.NET.SYS and, if it is not listed, continue with the next step.
At the CI prompt, enter STREAM JINETD.NET.SYS.

If you attempt to start inetd when it is already running, you'll see the following error message and the job will not be started:

An inetd is already running.

Starting JINETD Automatically

If you want to have the Internet daemon started automatically when your system starts up, add the STREAM JINETD command to the SYSSTART file. When you do, be sure that the stream command follows the network startup command NETCONTROL START.

Passwords on JINETD

When you stream the job file JINETD.NET.SYS, it logs on as MANAGER.SYS. As part of the installation of inetd, you must take care of any password requirements for this job. Two of the ways that you can do this include:

Add the MANAGER.SYS passwords directly to the job file, then alter the file security afterwards so that only MANAGER.SYS can read it. For example:
:ALTSEC JINETD.NET.SYS; (R,W:CR;X,L:AC)
Use the PASSEXEMPT parameter of the JOBSECURITY command (version C.60.00 and later) to control password exemption.

Starting inetd Interactively

You may also start inetd interactively, though this is not recommended for normal use. To do so, enter the following command at the CI prompt:

:INETD.NET.SYS

Or, from the POSIX shell enter this command:

$/etc/inetd

When you start inetd interactively, $STDLIST for the Internet daemon is your terminal. This means that all error and warning messages that normally go to JINETD's spool file will appear on the screen.

Error and Status Reporting for inetd

While inetd is running, any errors and other status messages that it generates are recorded so that you can monitor its condition. All errors, regardless of their degree of seriousness, are sent to the $STDLIST device assigned to inetd. For example, if you streamed JINETD, error messages will appear in the spool file associated with that job. More critical errors are displayed on the system console in addition to being sent to $STDLIST. For more information, read "Using inetd Message Logging" later in this chapter.

Stopping inetd

To stop inetd, you abort the JINETD job. Stopping the inetd server (aborting JINETD) will cause subsequent incoming connection requests to be refused.

First find the number assigned to JINETD by entering:

:SHOWJOB JOB=@J

You will see a display of job information similar to the following:


  JOBNUM  STATE IPRI JIN  JLIST    INTRODUCED  JOB NAME

  #J6546  EXEC        10S LP       THU 12:42A  TRNSPOOL,MGR.NSD
  #J6539  EXEC        10S PP       THU 12:32A  SPOOLJ,UNISPOOL.SYS
  #J6540  EXEC        10S LP       THU 12:41A  JINETD.NET.SYS

  3 JOBS (DISPLAYED):
      0 INTRO
      0 WAIT; INCL 0 DEFERRED
      3 EXEC; INCL 0 SESSIONS
      0 SUSP
  JOBFENCE= 6; JLIMIT= 10; SLIMIT= 60

  CURRENT:  1/15/96 16:12

  JOBNUM  STATE IPRI JIN  JLIST    SCHEDULED-INTRO   JOB NAME

  #J6667  SCHED   15  10S PP        1/15/96 16:50    CHECKJOB,MANAGER.SYS

  1 SCHEDULED JOB(S)

Issue the ABORTJOB command, specifying JINETD's job number on the command line. For example, if JINETD were logged on as job number "6540", you would enter:
:ABORTJOB #J6540

NOTE: If you have started inetd interactively, you use the -k option to kill (stop) it. To do so, enter INETD.NET.SYS -k at the CI prompt or enter /etc/inetd -k from the POSIX shell.

Summary of inetd Command Line Options

There are three options that you may add to the command line when you enter INETD.NET.SYS at the MPE CI prompt or enter /etc/inetd from the POSIX shell.

-c: Instructs inetd to reread the configuration file. Use this after you have made changes to the configuration (such as adding a new service) that you want to put into effect now, for an executing inetd.
-k: Kills, or stops, the currently executing inetd.
-l: A toggle command that starts or stops connection logging for inetd.

inetd Security File

Using inetd Message Logging