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- loncontrol restart now echoes loncron by closing port 5663 for IP
  addresses no longer in the cluster, and opens port 5663 for IP
  addresses of servers added to cluster since loncron last ran.

#!/usr/bin/perl
#
# $Id: loncontrol,v 1.43 2011/05/15 01:10:02 raeburn Exp $
#
# The LearningOnline Network with CAPA
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# Startup script for the LON-CAPA network processes
#

# chkconfig: 345 95 5
# description: LON-CAPA is a "network of knowledge".  It is used to \
# distribute knowledge resources and instructional management.
# processnames: lonc, lond, lonsql, lonmaxima, lonr
# pidfiles: /home/httpd/perl/logs/lon*.pid
# config: /etc/httpd/conf/loncapa.conf
# config: /home/httpd/lonTabs/hosts.tab
# config: /home/httpd/lonTabs/spare.tab
# SuSE chkconfig/insserv info
### BEGIN INIT INFO
# Provides:       loncapa
# Required-Start: SuSEfirewall2_setup mysql apache2 $network $remote_fs
# Should-Start:   $ALL
# Required-Stop:
# Default-Start:  3 5
# Default-Stop:
# Description:    Starts the LON-CAPA services
### END INIT INFO

use strict;
use lib '/home/httpd/lib/perl/';
use LONCAPA::Configuration;
use LONCAPA::Firewall;
use Apache::lonnet;

my $command=$ARGV[0]; $command=~s/[^a-z]//g;

$ENV{'PATH'}="/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin";
$ENV{'BASH_ENV'}="";

sub stop_daemon {
    my ($daemon,$killallname)=@_;
    my $pidfile="/home/httpd/perl/logs/$daemon.pid";
    
    printf("%-15s ",$daemon);
    if (-e $pidfile) {
	open(PIDFILE,$pidfile);
	my $daemonpid=<PIDFILE>;
	chomp($daemonpid);
	kill TERM => $daemonpid;
	my $count=0;
	while ($count++ < 5 && kill(0 => $daemonpid)) {
	    sleep 1;
	}
	if (kill 0 => $daemonpid) {
	    kill KILL => $daemonpid;
	    sleep 1;
	    if (kill 0 => $daemonpid) {
		print("failed to kill");
	    } else {
		print("killed");
	    }
	} else {
	    print("stopped");
	}
    } else {
	print("not running");
    }
    system("killall -q -0 $killallname");
    if ($? == 0) {
	system("killall -q $killallname");
	print(", killed off extraneous processes");
    }
    unlink($pidfile);
    print("\n");
}

sub clean_sockets {
    opendir(SOCKETS,"/home/httpd/sockets/");
    my $perlvarref=&LONCAPA::Configuration::read_conf();
    return if (ref($perlvarref) ne 'HASH');
    while (my $fname=readdir(SOCKETS)) {
	next if (-d $fname
		 || $fname=~/(mysqlsock|maximasock|\Q$perlvarref->{'lonSockDir'}\E)/);
	unlink("/home/httpd/sockets/$fname");
    }
}

if (($command eq "restart") || ($command eq 'stop') || 
    ($command eq 'start') || ($command eq "status")) {
    my $iptables = &LONCAPA::Firewall::get_pathto_iptables();
    my @fw_chains = &LONCAPA::Firewall::get_fw_chains($iptables);
    my $lond_port = &LONCAPA::Firewall::get_lond_port();
    my %iphost;
    if ($command eq 'restart') {
        print 'Restarting LON-CAPA'."\n";
        print 'Ending LON-CAPA client and daemon processes'."\n";
        foreach my $daemon ('lonsql','lond','lonc','lonmemcached','lonmaxima','lonr') {
            my $killallname=$daemon;
            if ($daemon eq 'lonc') { $killallname='loncnew'; }
            &stop_daemon($daemon,$killallname);
        }
        %iphost = &Apache::lonnet::get_iphost();
        my $firewall_result =
            &LONCAPA::Firewall::firewall_close_port($iptables,\@fw_chains,
                                             $lond_port,\%iphost,[$lond_port]);
        if ($firewall_result) {
            print "$firewall_result\n";
        }
        $firewall_result =
            &LONCAPA::Firewall::firewall_open_port($iptables,\@fw_chains,
                                            $lond_port, \%iphost,[$lond_port]);
        if (($firewall_result eq 'ok') || ($firewall_result eq 'inactive firewall')) {
            if ($firewall_result eq 'inactive firewall') {
                print "WARNING: iptables firewall is currently inactive\n";
            }
        } elsif ($firewall_result) {
            print "$firewall_result\n";
        }
        print 'Starting LON-CAPA client and daemon processes (please be patient)'.
              "\n";
        system("su www -c '/home/httpd/perl/loncron --justcheckdaemons'");
    } elsif ($command eq 'stop') {
        print 'Stopping LON-CAPA'."\n";
        foreach my $daemon ('lonsql','lond','lonc','lonmemcached','lonmaxima','lonr') {
	    my $killallname=$daemon;
	    if ($daemon eq 'lonc') { $killallname='loncnew'; }
	    &stop_daemon($daemon,$killallname);
        }
        my $firewall_result = 
            &LONCAPA::Firewall::firewall_close_port($iptables,\@fw_chains,$lond_port,\%iphost,[$lond_port]);
        if ($firewall_result) {
            print "$firewall_result\n";
        }
        &clean_sockets();
    } elsif ($command eq "start") {
        %iphost = &Apache::lonnet::get_iphost();
        my $firewall_result = 
            &LONCAPA::Firewall::firewall_open_port($iptables,\@fw_chains,$lond_port,\%iphost,[$lond_port]);
        if (($firewall_result eq 'ok') || ($firewall_result eq 'inactive firewall')) {
            if ($firewall_result eq 'inactive firewall') {
                print "WARNING: iptables firewall is currently inactive\n";
            }
            print 'Starting LON-CAPA'."\n";
            print 'Starting LON-CAPA client and daemon processes (please be patient)'.
	          "\n";
            system("su www -c '/home/httpd/perl/loncron --justcheckdaemons'");
        } else {
            print "Not starting LON-CAPA\n";
            if ($firewall_result eq 'port number unknown') {
                print "Could not check for status of LON-CAPA port in running firewall - port number unknown.  \n";
            } elsif ($firewall_result) {
                print "$firewall_result\n";
            }
        }
    } elsif ($command eq "status") {
        %iphost = &Apache::lonnet::get_iphost();
        my $response=`/bin/cat /home/httpd/perl/logs/*.pid 2>&1`;
        if ($response=~/No such file or directory/) {
	    print 'LON-CAPA is not running.'."\n";
        } else {
	    print 'LON-CAPA is running.'."\n";
	    system("su www -c '/home/httpd/perl/loncron --justcheckconnections'");
        }
        if (! &LONCAPA::Firewall::firewall_is_active()) {
            print 'The iptables firewall is not active'."\n";
        }
        if ($lond_port) {
            my $londopen;
            foreach my $fw_chain (@fw_chains) { 
                my $numopen = &LONCAPA::Firewall::firewall_is_port_open($iptables,$fw_chain,$lond_port,$lond_port,\%iphost);
                $londopen += $numopen; 
            }
            if ($londopen) {
                print "The LON-CAPA port ($lond_port) is open in firewall.\n";
            } elsif (&LONCAPA::Firewall::firewall_is_active) {
                print "The LON-CAPA port ($lond_port) is NOT open in running firewall!\n";
            }
        } else {
            if (&LONCAPA::Firewall::firewall_is_active()) {
                print "Could not check for status of LON-CAPA port in running firewall - port number unknown.\n";
            } else {
                print "LON-CAPA port number is unknown, and firewall is not running.\n";
            }
        }
    }
} elsif ($command eq "reload") {
    print 'Reload LON-CAPA config files'."\n";
    system("su www -c '/home/httpd/perl/loncron --justreload'");
} else {
    print "You need to specify one of reload|restart|stop|start|status on the command line.\n";
}