examples/msr/msrserv.pl
author Florian Pose <fp@igh-essen.com>
Fri, 30 May 2008 09:39:29 +0000
changeset 926 6bb33c6ec770
parent 246 0bf7c769de06
permissions -rwxr-xr-x
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#!/usr/bin/perl -w
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#------------------------------------------------------------------------------
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#
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#  Copyright (C) 2006  Ingenieurgemeinschaft IgH
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#
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#  This file is part of the IgH EtherCAT Master.
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#
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#  The IgH EtherCAT Master is free software; you can redistribute it
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#  and/or modify it under the terms of the GNU General Public License
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#  as published by the Free Software Foundation; either version 2 of the
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#  License, or (at your option) any later version.
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#
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#  The IgH EtherCAT Master is distributed in the hope that it will be
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#  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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#  GNU General Public License for more details.
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#
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#  You should have received a copy of the GNU General Public License
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#  along with the IgH EtherCAT Master; if not, write to the Free Software
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#  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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#
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#  The right to use EtherCAT Technology is granted and comes free of
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#  charge under condition of compatibility of product made by
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#  Licensee. People intending to distribute/sell products based on the
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#  code, have to sign an agreement to guarantee that products using
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#  software based on IgH EtherCAT master stay compatible with the actual
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#  EtherCAT specification (which are released themselves as an open
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#  standard) as the (only) precondition to have the right to use EtherCAT
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#  Technology, IP and trade marks.
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#
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#------------------------------------------------------------------------------
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#
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#  Multithreaded Server
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#  according to the example from "Programming Perl"
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#  this code is improved according to the example from
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#  perldoc perlipc, so now safely being usable under Perl 5.8
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#  (see note (*))
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#
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#  works with read/write on a device-file
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#
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#------------------------------------------------------------------------------
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require 5.002;
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use strict;
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BEGIN { $ENV{PATH} = '/opt/msr/bin:/usr/bin:/bin' }
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use Socket;
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use Carp;
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use FileHandle;
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use Getopt::Std;
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use Sys::Syslog qw(:DEFAULT setlogsock);
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use vars qw (
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	     $self $pid $dolog $port $dev %opts $selfbase
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	     $len $offset $stream $written $read $log $blksize
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	     $instdir
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	     $authfile %authhosts
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	     );
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# Do logging to local syslogd by unix-domain socket instead of inetd
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setlogsock("unix");
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# Prototypes and some little Tools
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sub spawn;
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sub logmsg {
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  my ($level, $debug, @text) = @_;
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  syslog("daemon|$level", @text) if $debug > $dolog;
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#  print STDERR "daemon|$level", @text, "\n" if $dolog;
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}
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sub out {
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  my $waitpid = wait;
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  logmsg("notice", 2, "$waitpid exited");
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  unlink "$selfbase.pid";
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  exit 0;
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}
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sub help {
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  print "\n  usage: $0 [-l og] [-h elp] [-p port] [-d device]\n";
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  exit;
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}
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# Process Options
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%opts = (
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	 "l" => 1,
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	 "h" => 0,
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	 "p" => 2345,
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	 "d" => "/dev/msr"
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	 );
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getopts("lhp:d:", \%opts);
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help if $opts{"h"};
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( $self =  $0 ) =~ s+.*/++ ;
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( $selfbase = $self ) =~ s/\..*//;
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$log = "$selfbase.log";
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$dolog = $opts{"l"};
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$port = $opts{"p"};
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$dev = $opts{"d"};
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$blksize = 1024; # try to write as much bytes
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$instdir = "/opt/msr";
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$authfile = "$instdir/etc/hosts.auth";
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# Start logging
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openlog($self, 'pid');
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# Flush Output, dont buffer
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$| = 1;
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# first fork and run in background
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if ($pid = fork) {
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#  open LOG, ">$log" if $dolog;
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#  close LOG;
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  logmsg("notice", 2, "forked process: $pid\n");
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  exit 0;
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}
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# Server tells about startup success
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open (PID, ">/$instdir/var/run/$selfbase.pid");
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print PID "$$\n";
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close PID;
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# Cleanup on exit (due to kill -TERM signal)
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$SIG{TERM} = \&out;
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# We use streams
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my $proto = getprotobyname('tcp');
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# Open Server socket
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socket(Server, PF_INET, SOCK_STREAM, $proto) or die "socket: $!";
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setsockopt(Server, SOL_SOCKET, SO_REUSEADDR, pack("l", 1))
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  or die "setsocketopt: $!";
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bind (Server, sockaddr_in($port, INADDR_ANY))
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  or die "bind: $!";
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listen (Server, SOMAXCONN)
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  or die "listen: $!";
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%authhosts = ();
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# get authorized hosts
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open (AUTH, $authfile)
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  or logmsg ("notice", 2, "Could not read allowed hosts file: $authfile");
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while (<AUTH>) {
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    chomp;
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    my $host = lc $_;
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     if ($host =~ /^[\d\w]/) {
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	 $authhosts{$_} = 1;
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	 logmsg ("notice", 2, "Authorized host: >$host<");
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     }
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}
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close (AUTH);
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# tell about open server socket
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logmsg ("notice", 2, "Server started at port $port");
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my $waitedpid = 0;
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my $paddr;
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# wait for children to return, thus avoiding zombies
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# improvement (*)
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use POSIX ":sys_wait_h";
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sub REAPER {
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  my $child;
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  while (($waitedpid = waitpid(-1,WNOHANG)) > 0) {
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    logmsg ("notice", 2, "reaped $waitedpid", ($? ? " with exit $?" : ""));
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  }
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  $SIG{CHLD} = \&REAPER;  # loathe sysV
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}
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# also all sub-processes should wait for their children
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$SIG{CHLD} = \&REAPER;
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# start a new server for every incoming request
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# improvement (*) -- loop forever
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while ( 1 ) {
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  for ( $waitedpid = 0;
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	($paddr = accept(Client,Server)) || $waitedpid;
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	$waitedpid = 0, close Client ) {
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    next if $waitedpid and not $paddr;
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    my ($port, $iaddr) = sockaddr_in($paddr);
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   183
    my $name = lc gethostbyaddr($iaddr, AF_INET);
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   184
    my $ipaddr = inet_ntoa($iaddr);
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   185
    my $n = 0;
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# tell about the requesting client
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    logmsg ("info", 2, "Connection from >$ipaddr< ($name) at port $port");
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    spawn sub {
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      my ($head, $hlen, $pos, $pegel, $typ, $siz, $nch, $nrec, $dat, $i, $j, $n, $llen); 
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      my ($watchpegel, $shmpegel);
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      my ($rin, $rout, $in, $line, $data_requested, $oversample);
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      my (@channels);
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#   to use stdio on writing to Client
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      Client->autoflush();
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#   Open Device
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      sysopen (DEV, "$dev", O_RDWR | O_NONBLOCK, 0666) or die("can't open $dev");
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#   Bitmask to check for input on stdin
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      $rin = "";
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      vec($rin, fileno(Client), 1) = 1;
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#   check for authorized hosts
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      my $access = 'deny';
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      $access = 'allow' if $authhosts{$ipaddr};
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      $line = "<remote_host host=\"$ipaddr\" access=\"$access\">\n";
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      logmsg ("info", 2, $line);
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      $len = length $line;
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      $offset = 0;
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   213
      while ($len) {
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	$written = syswrite (DEV, $line, $len, $offset);
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	$len -= $written;
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	$offset += $written;
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   217
      }
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   218
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   219
      while ( 1 ) {
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	$in = select ($rout=$rin, undef, undef, 0.0); # poll client
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#     look for any Input from Client
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   222
	if ($in) {
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   223
#       exit on EOF
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	  $len = sysread (Client, $line, $blksize) or exit;
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	  logmsg("info", 0, "got $len bytes: \"$line\"");
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   226
	  $offset = 0;
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   227
#       copy request to device
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   228
	  while ($len) {
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   229
	    $written = syswrite (DEV, $line, $len, $offset);
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   230
	    $len -= $written;
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   231
	    $offset += $written;
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   232
	  }
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   233
	}
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   234
#     look for some output from device
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   235
	if ($len = sysread DEV, $stream, $blksize) {
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   236
	  print Client $stream;
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   237
	} else {
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   238
	  select undef, undef, undef, 0.1; # calm down if nothing on device
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   239
	}
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   240
      }
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   241
    };
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   242
    logmsg("info", 2, "spawned\n");
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   243
  }
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   244
  logmsg("info", 2, "server loop\n");
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   245
}
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   246
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   247
sub spawn {
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   248
  my $coderef = shift;
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   249
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   250
  unless (@_ == 0 && $coderef && ref($coderef) eq 'CODE') {
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   251
    confess "usage: spawn CODEREF";
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   252
  }
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   253
  my $pid;
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   254
  if (!defined($pid = fork)) {
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   255
    logmsg ("notice", 2, "fork failed: $!");
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   256
    return;
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   257
  } elsif ($pid) {
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   258
    logmsg ("notice", 2, "Request $pid");
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   259
    return; # Parent
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   260
  }
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   261
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   262
# do not use fdup as in the original example
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   263
# open (STDIN, "<&Client") or die "Can't dup client to stdin";
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   264
# open (STDOUT, ">&Client") or die "Can't dup client to stdout";
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   265
# STDOUT->autoflush();
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   266
  exit &$coderef();
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   267
}