title: Executing script on receiving incoming connection with xinetd
body: <p>I want xinetd to execute a shell script when a connection is received on a certain port. To accomplish this, followed this tutorial: [enter link description here][1]</p>
  
  <p>Unfortunately, the whole thing doesn't work as I hoped that's why I am going to show 
  you my configuration. </p>
  
  <p>The script that is called by xinetd is located at /usr/local/bin. It can be executed without any problems:</p>
  
  <pre><code>#!/bin/bash
  echo "connection received"
  </code></pre>
  
  <p>/etc/xinetd.d/testservice has this content:</p>
  
  <pre><code>service testservice
  {
          disable         = no
          socket_type     = stream
          protocol        = tcp
          port              = 5900
          log_on_success += USERID 
          log_on_failure += USERID
          server          = /usr/local/bin/testservice
          user            = root
          instances       = UNLIMITED
          wait            = no
          log_type        = SYSLOG daemon debug
  }
  </code></pre>
  
  <p>In /etc/services I added this line:</p>
  
  <pre><code>testservice        5900/tcp 
  </code></pre>
  
  <p>Then I restarted xinetd with <code>service xinetd restart</code></p>
  
  <p>Finally, I tried to connect to the client:</p>
  
  <pre><code>nc host1 5900
  </code></pre>
  
  <p>Could someone please tell me what went wrong here?</p>
  
  <p>Here are some lines from /var/log/syslog.1:</p>
  
  <pre><code>Nov 22 10:07:33 ubuntu1 xinetd[886]: Reading included configuration file: /etc/xinetd.d/chargen [file=/etc/xinetd.conf] [line=17]
  Nov 22 10:07:33 ubuntu1 xinetd[886]: Reading included configuration file: /etc/xinetd.d/daytime [file=/etc/xinetd.d/daytime] [line=28]
  Nov 22 10:07:33 ubuntu1 xinetd[886]: Reading included configuration file: /etc/xinetd.d/discard [file=/etc/xinetd.d/discard] [line=26]
  Nov 22 10:07:33 ubuntu1 xinetd[886]: Reading included configuration file: /etc/xinetd.d/echo [file=/etc/xinetd.d/echo] [line=25]
  Nov 22 10:07:33 ubuntu1 xinetd[886]: Reading included configuration file: /etc/xinetd.d/exec [file=/etc/xinetd.d/exec] [line=26]
  Nov 22 10:07:34 ubuntu1 xinetd[886]: Reading included configuration file: /etc/xinetd.d/login [file=/etc/xinetd.d/login] [line=8]
  Nov 22 10:07:34 ubuntu1 xinetd[886]: Reading included configuration file: /etc/xinetd.d/rexec [file=/etc/xinetd.d/rexec] [line=13]
  Nov 22 10:07:34 ubuntu1 xinetd[886]: Reading included configuration file: /etc/xinetd.d/rexecd [file=/etc/xinetd.d/rexecd] [line=0]
  Nov 22 10:07:34 ubuntu1 xinetd[886]: Reading included configuration file: /etc/xinetd.d/rlogin [file=/etc/xinetd.d/rlogin] [line=10]
  Nov 22 10:07:34 ubuntu1 acpid: 33 rules loaded
  Nov 22 10:07:34 ubuntu1 acpid: waiting for events: event logging is off
  Nov 22 10:07:34 ubuntu1 xinetd[886]: Reading included configuration file: /etc/xinetd.d/rsh [file=/etc/xinetd.d/rsh] [line=10]
  Nov 22 10:07:34 ubuntu1 xinetd[886]: Reading included configuration file: /etc/xinetd.d/shell [file=/etc/xinetd.d/shell] [line=11]
  Nov 22 10:07:34 ubuntu1 xinetd[886]: Reading included configuration file: /etc/xinetd.d/time [file=/etc/xinetd.d/time] [line=11]
  Nov 22 10:07:34 ubuntu1 xinetd[886]: removing chargen
  Nov 22 10:07:34 ubuntu1 xinetd[886]: removing chargen
  Nov 22 10:07:34 ubuntu1 xinetd[886]: removing daytime
  Nov 22 10:07:34 ubuntu1 xinetd[886]: removing daytime
  Nov 22 10:07:34 ubuntu1 xinetd[886]: removing discard
  Nov 22 10:07:34 ubuntu1 xinetd[886]: removing discard
  Nov 22 10:07:34 ubuntu1 xinetd[886]: removing echo
  Nov 22 10:07:34 ubuntu1 xinetd[886]: removing echo
  Nov 22 10:07:34 ubuntu1 xinetd[886]: removing time
  Nov 22 10:07:34 ubuntu1 xinetd[886]: removing time
  Nov 22 10:07:34 ubuntu1 xinetd[886]: bind failed (Address already in use (errno = 98)). service = exec
  Nov 22 10:07:34 ubuntu1 xinetd[886]: Service exec failed to start and is deactivated.
  Nov 22 10:07:34 ubuntu1 xinetd[886]: bind failed (Address already in use (errno = 98)). service = login
  Nov 22 10:07:34 ubuntu1 xinetd[886]: Service login failed to start and is deactivated.
  Nov 22 10:07:34 ubuntu1 xinetd[886]: bind failed (Address already in use (errno = 98)). service = shell
  Nov 22 10:07:34 ubuntu1 xinetd[886]: Service shell failed to start and is deactivated.
  Nov 22 10:07:34 ubuntu1 xinetd[886]: xinetd Version 2.3.14 started with libwrap loadavg options compiled in.
  Nov 22 10:07:34 ubuntu1 xinetd[886]: Started working: 3 available services
  </code></pre>
  
  <p>The other services seem to run:</p>
  
  <p>netstat -an | egrep 'Proto|LISTEN'</p>
  
  <pre><code>Proto Recv-Q Send-Q Local Address           Foreign Address         State      
  tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN     
  tcp        0      0 0.0.0.0:512             0.0.0.0:*               LISTEN     
  tcp        0      0 0.0.0.0:513             0.0.0.0:*               LISTEN     
  tcp        0      0 0.0.0.0:514             0.0.0.0:*               LISTEN     
  tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     
  tcp6       0      0 ::1:631                 :::*                    LISTEN     
  tcp6       0      0 :::22                   :::*                    LISTEN     
  Proto RefCnt Flags       Type       State         I-Node   Path
  unix  2      [ ACC ]     STREAM     LISTENING     10248    /run/user/user1/keyring-0bvpKQ/control
  unix  2      [ ACC ]     STREAM     LISTENING     10250    /run/user/user1/keyring-0bvpKQ/ssh
  unix  2      [ ACC ]     STREAM     LISTENING     8087     /tmp/.X11-unix/X0
  unix  2      [ ACC ]     STREAM     LISTENING     10038    @/tmp/dbus-3MCEY0sgqz
  unix  2      [ ACC ]     STREAM     LISTENING     689      @/com/ubuntu/upstart
  unix  2      [ ACC ]     STREAM     LISTENING     7758     /var/run/cups/cups.sock
  unix  2      [ ACC ]     STREAM     LISTENING     986      @/org/bluez/audio
  unix  2      [ ACC ]     STREAM     LISTENING     10192    /tmp/.pcmanfm-socket--0-user1
  unix  2      [ ACC ]     STREAM     LISTENING     8086     @/tmp/.X11-unix/X0
  unix  2      [ ACC ]     SEQPACKET  LISTENING     882      /run/udev/control
  unix  2      [ ACC ]     STREAM     LISTENING     913      /var/run/dbus/system_bus_socket
  unix  2      [ ACC ]     STREAM     LISTENING     10028    /tmp/ssh-1PFvKafVKThh/agent.1507
  unix  2      [ ACC ]     STREAM     LISTENING     34594    /tmp/.lxterminal-socket:0-user1
  unix  2      [ ACC ]     STREAM     LISTENING     968      /var/run/avahi-daemon/socket
  unix  2      [ ACC ]     STREAM     LISTENING     982      /var/run/sdp
  unix  2      [ ACC ]     STREAM     LISTENING     10629    /tmp/.menu-cached-:0-user1
  unix  2      [ ACC ]     STREAM     LISTENING     8433     /var/run/acpid.socket
  </code></pre>
  
  <p>Maybe this is also helpful:</p>
  
  <pre><code>service xinetd restart
  stop: Rejected send message, 1 matched rules; type="method_call", sender=":1.73" (uid=1000 pid=5311 comm="stop xinetd ") interface="com.ubuntu.Upstart0_6.Job" member="Stop" error name="(unset)" requested_reply="0" destination="com.ubuntu.Upstart" (uid=0 pid=1 comm="/sbin/init")
  start: Rejected send message, 1 matched rules; type="method_call", sender=":1.74" (uid=1000 pid=5308 comm="start xinetd ") interface="com.ubuntu.Upstart0_6.Job" member="Start" error name="(unset)" requested_reply="0" destination="com.ubuntu.Upstart" (uid=0 pid=1 comm="/sbin/init")
  </code></pre>