--- loncom/lond 2003/10/08 20:37:48 1.155 +++ loncom/lond 2003/11/01 16:32:32 1.160 @@ -2,7 +2,7 @@ # The LearningOnline Network # lond "LON Daemon" Server (port "LOND" 5663) # -# $Id: lond,v 1.155 2003/10/08 20:37:48 albertel Exp $ +# $Id: lond,v 1.160 2003/11/01 16:32:32 www Exp $ # # Copyright Michigan State University Board of Trustees # @@ -26,41 +26,6 @@ # # http://www.lon-capa.org/ # -# 5/26/99,6/4,6/10,6/11,6/14,6/15,6/26,6/28,6/30, -# 7/8,7/9,7/10,7/12,7/17,7/19,9/21, -# 10/7,10/8,10/9,10/11,10/13,10/15,11/4,11/16, -# 12/7,12/15,01/06,01/11,01/12,01/14,2/8, -# 03/07,05/31 Gerd Kortemeyer -# 06/29,06/30,07/14,07/15,07/17,07/20,07/25,09/18 Gerd Kortemeyer -# 12/05,12/13,12/29 Gerd Kortemeyer -# YEAR=2001 -# 02/12 Gerd Kortemeyer -# 03/24 Gerd Kortemeyer -# 05/11,05/28,08/30 Gerd Kortemeyer -# 11/26,11/27 Gerd Kortemeyer -# 12/22 Gerd Kortemeyer -# YEAR=2002 -# 01/20/02,02/05 Gerd Kortemeyer -# 02/05 Guy Albertelli -# 02/12 Gerd Kortemeyer -# 02/19 Matthew Hall -# 02/25 Gerd Kortemeyer -# 01/xx/2003 Ron Fox.. Remove preforking. This makes the general daemon -# logic simpler (and there were problems maintaining the preforked -# population). Since the time averaged connection rate is close to zero -# because lonc's purpose is to maintain near continuous connnections, -# preforking is not really needed. -# 08/xx/2003 Ron Fox: Add management requests. Management requests -# will be validated via a call to ValidateManager. At present, this -# is done by simple host verification. In the future we can modify -# this function to do a certificate check. -# Management functions supported include: -# - pushing /home/httpd/lonTabs/hosts.tab -# - pushing /home/httpd/lonTabs/domain.tab -# 09/08/2003 Ron Fox: Told lond to take care of change logging so we -# don't have to remember it: -# - use strict; use lib '/home/httpd/lib/perl/'; @@ -85,7 +50,7 @@ my $DEBUG = 0; # Non zero to ena my $status=''; my $lastlog=''; -my $VERSION='$Revision: 1.155 $'; #' stupid emacs +my $VERSION='$Revision: 1.160 $'; #' stupid emacs my $remoteVERSION; my $currenthostid; my $currentdomainid; @@ -99,6 +64,7 @@ my $thisserver; my %hostid; my %hostdom; my %hostip; +my %managers; # If defined $managers{hostname} is a manager my %perlvar; # Will have the apache conf defined perl vars. # @@ -155,7 +121,37 @@ sub GetCertificate { return $clientip; } +# +# ReadManagerTable: Reads in the current manager table. For now this is +# done on each manager authentication because: +# - These authentications are not frequent +# - This allows dynamic changes to the manager table +# without the need to signal to the lond. +# + +sub ReadManagerTable { + + # Clean out the old table first.. + + foreach my $key (keys %managers) { + delete $managers{$key}; + } + my $tablename = $perlvar{'lonTabDir'}."/managers.tab"; + if (!open (MANAGERS, $tablename)) { + logthis('No manager table. Nobody can manage!!'); + return; + } + while(my $host = ) { + chomp($host); + if (!defined $hostip{$host}) { + logthis(' manager '.$host. + " not in hosts.tab, rejected as manager"); + } else { + $managers{$host} = $hostip{$host}; # Whatever for now. + } + } +} # # ValidManager: Determines if a given certificate represents a valid manager. @@ -167,14 +163,25 @@ sub GetCertificate { sub ValidManager { my $certificate = shift; - my $hostentry = $hostid{$certificate}; - if ($hostentry ne undef) { - &logthis('Authenticating manager'. - " $hostentry"); - return 1; + ReadManagerTable; + + my $hostname = $hostid{$certificate}; + + + if ($hostname ne undef) { + if($managers{$hostname} ne undef) { + &logthis('Authenticating manager'. + " $hostname"); + return 1; + } else { + &logthis('"); + return 0; + } } else { &logthis(' Failed manager authentication '. "$certificate "); + return 0; } } # @@ -226,7 +233,66 @@ sub CopyFile { return 0; } } - +# +# Host files are passed out with externally visible host IPs. +# If, for example, we are behind a fire-wall or NAT host, our +# internally visible IP may be different than the externally +# visible IP. Therefore, we always adjust the contents of the +# host file so that the entry for ME is the IP that we believe +# we have. At present, this is defined as the entry that +# DNS has for us. If by some chance we are not able to get a +# DNS translation for us, then we assume that the host.tab file +# is correct. +# BUGBUGBUG - in the future, we really should see if we can +# easily query the interface(s) instead. +# Parameter(s): +# contents - The contents of the host.tab to check. +# Returns: +# newcontents - The adjusted contents. +# +# +sub AdjustHostContents { + my $contents = shift; + my $adjusted; + my $me = $perlvar{'lonHostID'}; + + foreach my $line (split(/\n/,$contents)) { + if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) { + chomp($line); + my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line); + if ($id eq $me) { + open(PIPE, " /usr/bin/host $name |") || die "Cant' make host pipeline"; + my $hostinfo = ; + close PIPE; + + my ($hostname, $has, $address, $ipnew) = split(/ /,$hostinfo); + &logthis(''. + "hostname = $hostname me = $me, name = $name actual ip = $ipnew "); + + if ($hostname eq $name) { # Lookup succeeded.. + &logthis(' look up ok '); + $ip = $ipnew; + } else { + &logthis(' Lookup failed: ' + .$hostname." ne $name "); + } + # Reconstruct the host line and append to adjusted: + + my $newline = "$id:$domain:$role:$name:$ip"; + if($maxcon ne "") { # Not all hosts have loncnew tuning params + $newline .= ":$maxcon:$idleto:$mincon"; + } + $adjusted .= $newline."\n"; + + } else { # Not me, pass unmodified. + $adjusted .= $line."\n"; + } + } else { # Blank or comment never re-written. + $adjusted .= $line."\n"; # Pass blanks and comments as is. + } + } + return $adjusted; +} # # InstallFile: Called to install an administrative file: # - The file is created with .tmp @@ -319,6 +385,16 @@ sub PushFile { &logthis(' Pushfile: backed up ' .$tablefile." to $backupfile"); + # If the file being pushed is the host file, we adjust the entry for ourself so that the + # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible + # to conceive of conditions where we don't have a DNS entry locally. This is possible in a + # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now) + # that possibilty. + + if($filename eq "host") { + $contents = AdjustHostContents($contents); + } + # Install the new file: if(!InstallFile($tablefile, $contents)) { @@ -2354,7 +2430,7 @@ sub currentversion { # see if this is a regular file (ignore links produced earlier) my $thisfile=$ulsdir.'/'.$ulsfn; unless (-l $thisfile) { - if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E/) { + if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) { if ($1>$version) { $version=$1; } } } @@ -2507,7 +2583,7 @@ sub userload { while ($filename=readdir(LONIDS)) { if ($filename eq '.' || $filename eq '..') {next;} my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9]; - if ($curtime-$mtime < 3600) { $numusers++; } + if ($curtime-$mtime < 1800) { $numusers++; } } closedir(LONIDS); }