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Diff for /loncom/Attic/lonc between versions 1.22 and 1.29

version 1.22, 2001/11/29 18:57:46 version 1.29, 2002/02/25 15:48:11
Line 39 Line 39
 # 2/8,7/25 Gerd Kortemeyer  # 2/8,7/25 Gerd Kortemeyer
 # 12/05 Scott Harrison  # 12/05 Scott Harrison
 # 12/05 Gerd Kortemeyer  # 12/05 Gerd Kortemeyer
   # YEAR=2001
 # 01/10/01 Scott Harrison  # 01/10/01 Scott Harrison
 # 03/14/01,03/15,06/12,11/26,11/27,11/28 Gerd Kortemeyer  # 03/14/01,03/15,06/12,11/26,11/27,11/28 Gerd Kortemeyer
   # 12/20 Scott Harrison
   # YEAR=2002
   # 2/19/02,02/22/02,02/25/02 Gerd Kortemeyer
 #   # 
 # based on nonforker from Perl Cookbook  # based on nonforker from Perl Cookbook
 # - server who multiplexes without forking  # - server who multiplexes without forking
Line 53  use Socket; Line 57  use Socket;
 use Fcntl;  use Fcntl;
 use Tie::RefHash;  use Tie::RefHash;
 use Crypt::IDEA;  use Crypt::IDEA;
   use Net::Ping;
   use LWP::UserAgent();
   
 my $status='';  my $status='';
 my $lastlog='';  my $lastlog='';
Line 60  my $lastlog=''; Line 66  my $lastlog='';
 # grabs exception and records it to log before exiting  # grabs exception and records it to log before exiting
 sub catchexception {  sub catchexception {
     my ($signal)=@_;      my ($signal)=@_;
     $SIG{'QUIT'}='DEFAULT';      $SIG{QUIT}='DEFAULT';
     $SIG{__DIE__}='DEFAULT';      $SIG{__DIE__}='DEFAULT';
       chomp($signal);
     &logthis("<font color=red>CRITICAL: "      &logthis("<font color=red>CRITICAL: "
      ."ABNORMAL EXIT. Child $$ for server $wasserver died through "       ."ABNORMAL EXIT. Child $$ for server [$wasserver] died through "
      ."\"$signal\" with this parameter->[$@]</font>");       ."\"$signal\" with parameter [$@]</font>");
     die($@);      die($@);
 }  }
   
 $childmaxattempts=5;  $childmaxattempts=5;
   
   # -------------------------------------- Routines to see if other box available
   
   sub online {
       my $host=shift;
       &status("Pinging ".$host);
       my $p=Net::Ping->new("tcp",20);
       my $online=$p->ping("$host");
       $p->close();
       undef ($p);
       return $online;
   }
   
   sub connected {
       my ($local,$remote)=@_;
       &status("Checking connection $local to $remote");
       $local=~s/\W//g;
       $remote=~s/\W//g;
   
       unless ($hostname{$local}) { return 'local_unknown'; }
       unless ($hostname{$remote}) { return 'remote_unknown'; }
   
       unless (&online($hostname{$local})) { return 'local_offline'; }
   
       my $ua=new LWP::UserAgent;
       
       my $request=new HTTP::Request('GET',
         "http://".$hostname{$local}.'/cgi-bin/ping.pl?'.$remote);
   
       my $response=$ua->request($request);
   
       unless ($response->is_success) { return 'local_error'; }
   
       my $reply=$response->content;
       $reply=(split("\n",$reply))[0];
       $reply=~s/\W//g;
       if ($reply ne $remote) { return $reply; }
       return 'ok';
   }
   
   
 # -------------------------------- Set signal handlers to record abnormal exits  # -------------------------------- Set signal handlers to record abnormal exits
   
 $SIG{'QUIT'}=\&catchexception;  &status("Init exception handlers");
   $SIG{QUIT}=\&catchexception;
 $SIG{__DIE__}=\&catchexception;  $SIG{__DIE__}=\&catchexception;
   
 # ------------------------------------ Read httpd access.conf and get variables  # ------------------------------------ Read httpd access.conf and get variables
   &status("Read access.conf");
 open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";  open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
   
 while ($configline=<CONFIG>) {  while ($configline=<CONFIG>) {
Line 89  while ($configline=<CONFIG>) { Line 137  while ($configline=<CONFIG>) {
 close(CONFIG);  close(CONFIG);
   
 # ----------------------------- Make sure this process is running from user=www  # ----------------------------- Make sure this process is running from user=www
   &status("Check user ID");
 my $wwwid=getpwnam('www');  my $wwwid=getpwnam('www');
 if ($wwwid!=$<) {  if ($wwwid!=$<) {
    $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";     $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
Line 116  open (CONFIG,"$perlvar{'lonTabDir'}/host Line 165  open (CONFIG,"$perlvar{'lonTabDir'}/host
 while ($configline=<CONFIG>) {  while ($configline=<CONFIG>) {
     my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);      my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
     chomp($ip);      chomp($ip);
     $hostip{$id}=$ip;      if ($ip) {
        $hostip{$id}=$ip;
        $hostname{$id}=$name;
       }
 }  }
   
 close(CONFIG);  close(CONFIG);
   
 # -------------------------------------------------------- Routines for forking  # -------------------------------------------------------- Routines for forking
Line 141  sub REAPER {                        # ta Line 194  sub REAPER {                        # ta
     unlink($port);      unlink($port);
 }  }
   
 sub HUNTSMAN {                      # signal handler for SIGINT  sub hangup {
     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children      foreach (keys %children) {
     map {  
         $wasserver=$children{$_};          $wasserver=$children{$_};
         &status("Closing $wasserver");          &status("Closing $wasserver");
         &logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));          &logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
         &status("Kill PID $_ for $wasserver");          &status("Kill PID $_ for $wasserver");
  kill ('INT',$_);   kill ('INT',$_);
     } keys %children;      }
   }
   
   sub HUNTSMAN {                      # signal handler for SIGINT
       local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
       &hangup();
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     unlink("$execdir/logs/lonc.pid");      unlink("$execdir/logs/lonc.pid");
     &logthis("<font color=red>CRITICAL: Shutting down</font>");      &logthis("<font color=red>CRITICAL: Shutting down</font>");
Line 158  sub HUNTSMAN {                      # si Line 215  sub HUNTSMAN {                      # si
   
 sub HUPSMAN {                      # signal handler for SIGHUP  sub HUPSMAN {                      # signal handler for SIGHUP
     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children      local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
     map {      &hangup();
         $wasserver=$children{$_};  
         &status("Closing $wasserver");  
         &logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));  
         &status("Kill PID $_ for $wasserver");  
  kill ('INT',$_);  
     } keys %children;  
     &logthis("<font color=red>CRITICAL: Restarting</font>");      &logthis("<font color=red>CRITICAL: Restarting</font>");
     unlink("$execdir/logs/lonc.pid");      unlink("$execdir/logs/lonc.pid");
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
Line 175  sub checkchildren { Line 226  sub checkchildren {
     &initnewstatus();      &initnewstatus();
     &logstatus();      &logstatus();
     &logthis('Going to check on the children');      &logthis('Going to check on the children');
     map {      foreach (sort keys %children) {
  sleep 1;   sleep 1;
         unless (kill 'USR1' => $_) {          unless (kill 'USR1' => $_) {
     &logthis ('Child '.$_.' is dead');      &logthis ('<font color=red>CRITICAL: Child '.$_.' is dead</font>');
             &logstatus($$.' is dead');              &logstatus($$.' is dead');
         }           } 
     } sort keys %children;      }
 }  }
   
 sub USRMAN {  sub USRMAN {
     &logthis("USR1: Trying to establish connections again");      &logthis("USR1: Trying to establish connections again");
     foreach $thisserver (keys %hostip) {  
  $answer=subreply("ping",$thisserver);  
         &logthis("USR1: Ping $thisserver "  
         ."(pid >$childpid{$thisserver}<, $childatt{thisserver} attempts): "  
         ." >$answer<");  
     }  
     %childatt=();      %childatt=();
     &checkchildren();      &checkchildren();
 }  }
Line 233  sub logthis { Line 278  sub logthis {
     my $now=time;      my $now=time;
     my $local=localtime($now);      my $local=localtime($now);
     $lastlog=$local.': '.$message;      $lastlog=$local.': '.$message;
     print $fh "$local ($$): $message\n";      print $fh "$local ($$) [$status]: $message\n";
 }  }
   
   
Line 272  sub status { Line 317  sub status {
   
   
 # ---------------------------------------------------- Fork once and dissociate  # ---------------------------------------------------- Fork once and dissociate
   &status("Fork and dissociate");
 $fpid=fork;  $fpid=fork;
 exit if $fpid;  exit if $fpid;
 die "Couldn't fork: $!" unless defined ($fpid);  die "Couldn't fork: $!" unless defined ($fpid);
Line 280  die "Couldn't fork: $!" unless defined ( Line 325  die "Couldn't fork: $!" unless defined (
 POSIX::setsid() or die "Can't start new session: $!";  POSIX::setsid() or die "Can't start new session: $!";
   
 # ------------------------------------------------------- Write our PID on disk  # ------------------------------------------------------- Write our PID on disk
   &status("Write PID");
 $execdir=$perlvar{'lonDaemons'};  $execdir=$perlvar{'lonDaemons'};
 open (PIDSAVE,">$execdir/logs/lonc.pid");  open (PIDSAVE,">$execdir/logs/lonc.pid");
 print PIDSAVE "$$\n";  print PIDSAVE "$$\n";
Line 296  $SIG{HUP}=$SIG{USR1}='IGNORE'; Line 341  $SIG{HUP}=$SIG{USR1}='IGNORE';
 &status("Forking ...");  &status("Forking ...");
   
 foreach $thisserver (keys %hostip) {  foreach $thisserver (keys %hostip) {
     make_new_child($thisserver);      if (&online($hostname{$thisserver})) {
          make_new_child($thisserver);
       }
 }  }
   
 &logthis("Done starting initial servers");  &logthis("Done starting initial servers");
Line 315  while (1) { Line 362  while (1) {
     &status("Woke up");      &status("Woke up");
     foreach $thisserver (keys %hostip) {      foreach $thisserver (keys %hostip) {
         if (!$childpid{$thisserver}) {          if (!$childpid{$thisserver}) {
     if ($childatt{$thisserver}<$childmaxattempts) {      if (($childatt{$thisserver}<$childmaxattempts) &&
                   (&online($hostname{$thisserver}))) {
        $childatt{$thisserver}++;         $childatt{$thisserver}++;
                &logthis(                 &logthis(
    "<font color=yellow>INFO: Trying to reconnect for $thisserver "     "<font color=yellow>INFO: Trying to reconnect for $thisserver "
   ."($childatt{$thisserver} of $childmaxattempts attempts)</font>");     ."(".($childatt{$thisserver}?$childatt{$thisserver}:'none').
      " of $childmaxattempts attempts)</font>"); 
                make_new_child($thisserver);                 make_new_child($thisserver);
     }     } else {
                  &logthis(
      "<font color=yellow>INFO: Skipping $thisserver "
     ."($childatt{$thisserver} of $childmaxattempts attempts)</font>");
              } 
                  
         }                 }       
     }      }
 }  }
Line 362  $port = "$perlvar{'lonSockDir'}/$conserv Line 416  $port = "$perlvar{'lonSockDir'}/$conserv
   
 unlink($port);  unlink($port);
   
 # ---------------------------------------------------- Client to network server  # -------------------------------------------------------------- Open other end
   
 &status("Opening TCP: $conserver");  
   
 unless (  
   $remotesock = IO::Socket::INET->new(PeerAddr => $hostip{$conserver},  
                                       PeerPort => $perlvar{'londPort'},  
                                       Proto    => "tcp",  
                                       Type     => SOCK_STREAM)  
    ) {   
        my $st=120+int(rand(240));  
        &logthis(  
 "<font color=blue>WARNING: Couldn't connect $conserver ($st secs): $@</font>");  
        sleep($st);  
        exit;   
      };  
 # ----------------------------------------------------------------- Init dialog  
   
 &status("Init dialogue: $conserver");  
   
      $SIG{ALRM}=sub { die "timeout" };  
      $SIG{__DIE__}='DEFAULT';  
      eval {  
          alarm(60);  
 print $remotesock "init\n";  
 $answer=<$remotesock>;  
 print $remotesock "$answer";  
 $answer=<$remotesock>;  
 chomp($answer);  
           alarm(0);  
      };  
      $SIG{ALRM}='DEFAULT';  
      $SIG{__DIE__}=\&catchexception;  
    
      if ($@=~/timeout/) {  
  &logthis("Timed out during init: $conserver");  
          exit;  
      }  
   
   
 &logthis("Init reply for $conserver: >$answer<");  
 if ($answer ne 'ok') {  
        my $st=120+int(rand(240));  
        &logthis(  
 "<font color=blue>WARNING: Init failed $conserver ($st secs)</font>");  
        sleep($st);  
        exit;   
 }  
 sleep 5;  
 &status("Ponging $conserver");  
 print $remotesock "pong\n";  
 $answer=<$remotesock>;  
 chomp($answer);  
 &logthis("Pong reply for $conserver: >$answer<");  
 # ----------------------------------------------------------- Initialize cipher  
   
 &status("Initialize cipher: $conserver");  &openremote($conserver);
 print $remotesock "ekey\n";  
 my $buildkey=<$remotesock>;  
 my $key=$conserver.$perlvar{'lonHostID'};  
 $key=~tr/a-z/A-Z/;  
 $key=~tr/G-P/0-9/;  
 $key=~tr/Q-Z/0-9/;  
 $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;  
 $key=substr($key,0,32);  
 my $cipherkey=pack("H32",$key);  
 if ($cipher=new IDEA $cipherkey) {  
    &logthis("Secure connection initialized: $conserver");  
 } else {  
    my $st=120+int(rand(240));  
    &logthis(  
      "<font color=blue>WARNING: ".  
      "Could not establish secure connection, $conserver ($st secs)!</font>");  
    sleep($st);  
    exit;  
 }  
   
 # ----------------------------------------- We're online, send delayed messages  # ----------------------------------------- We're online, send delayed messages
     &status("Checking for delayed messages");      &status("Checking for delayed messages");
Line 447  if ($cipher=new IDEA $cipherkey) { Line 428  if ($cipher=new IDEA $cipherkey) {
     @allbuffered=grep /\.$conserver$/, readdir DIRHANDLE;      @allbuffered=grep /\.$conserver$/, readdir DIRHANDLE;
     closedir(DIRHANDLE);      closedir(DIRHANDLE);
     my $dfname;      my $dfname;
     map {      foreach (@allbuffered) {
         &status("Sending delayed $conserver $_");          &status("Sending delayed $conserver $_");
         $dfname="$path/$_";          $dfname="$path/$_";
         &logthis($dfname);          &logthis('Sending '.$dfname);
         my $wcmd;          my $wcmd;
         {          {
          my $dfh=IO::File->new($dfname);           my $dfh=IO::File->new($dfname);
Line 488  if ($cipher=new IDEA $cipherkey) { Line 469  if ($cipher=new IDEA $cipherkey) {
             &logthis("Delayed $cmd to $conserver: >$answer<");              &logthis("Delayed $cmd to $conserver: >$answer<");
             &logperm("S:$conserver:$bcmd");              &logperm("S:$conserver:$bcmd");
         }                  }        
     } @allbuffered;      }
   
 # ------------------------------------------------------- Listen to UNIX socket  # ------------------------------------------------------- Listen to UNIX socket
 &status("Opening socket $conserver");  &status("Opening socket $conserver");
Line 577  while (1) { Line 558  while (1) {
         next unless exists $outbuffer{$client};          next unless exists $outbuffer{$client};
   
         $rv = $client->send($outbuffer{$client}, 0);          $rv = $client->send($outbuffer{$client}, 0);
   
         unless ($outbuffer{$client}=~/con_lost\n$/) {
         unless (defined $rv) {          unless (defined $rv) {
             # Whine, but move on.              # Whine, but move on.
             &logthis("I was told I could write, but I can't.\n");              &logthis("I was told I could write, but I can't.\n");
Line 602  while (1) { Line 585  while (1) {
             close($client);              close($client);
             next;              next;
         }          }
         } else {
   # -------------------------------------------------------- Wow, connection lost
            &logthis(
        "<font color=red>CRITICAL: Closing connection $conserver</font>");
    &status("Connection lost $conserver");
            $remotesock->shutdown(2);
            &logthis("Attempting to open new connection");
            &openremote($conserver);          
         }
     }      }
      
 }  }
 }  }
   
Line 619  sub handle { Line 612  sub handle {
 # ============================================================= Process request  # ============================================================= Process request
         # $request is the text of the request          # $request is the text of the request
         # put text of reply into $outbuffer{$client}          # put text of reply into $outbuffer{$client}
   # ------------------------------------------------------------ Is this the end?
           if ($request eq "close_connection_exit\n") {
       &status("Request close connection: $conserver");
              &logthis(
        "<font color=red>CRITICAL: Request Close Connection $conserver</font>");
              $remotesock->shutdown(2);
              $server->close();
              exit;
           }
 # -----------------------------------------------------------------------------  # -----------------------------------------------------------------------------
         if ($request =~ /^encrypt\:/) {          if ($request =~ /^encrypt\:/) {
     my $cmd=$request;      my $cmd=$request;
Line 693  sub nonblock { Line 695  sub nonblock {
             or die "Can't make socket nonblocking: $!\n";              or die "Can't make socket nonblocking: $!\n";
 }  }
   
   
   sub openremote {
   # ---------------------------------------------------- Client to network server
   
       my $conserver=shift;
   
   &status("Opening TCP: $conserver");
   
   unless (
     $remotesock = IO::Socket::INET->new(PeerAddr => $hostip{$conserver},
                                         PeerPort => $perlvar{'londPort'},
                                         Proto    => "tcp",
                                         Type     => SOCK_STREAM)
      ) { 
          my $st=120+int(rand(240));
          &logthis(
   "<font color=blue>WARNING: Couldn't connect $conserver ($st secs): $@</font>");
          sleep($st);
          exit; 
        };
   # ----------------------------------------------------------------- Init dialog
   
   &status("Init dialogue: $conserver");
   
        $SIG{ALRM}=sub { die "timeout" };
        $SIG{__DIE__}='DEFAULT';
        eval {
            alarm(60);
   print $remotesock "init\n";
   $answer=<$remotesock>;
   print $remotesock "$answer";
   $answer=<$remotesock>;
   chomp($answer);
             alarm(0);
        };
        $SIG{ALRM}='DEFAULT';
        $SIG{__DIE__}=\&catchexception;
    
        if ($@=~/timeout/) {
    &logthis("Timed out during init: $conserver");
            exit;
        }
   
   if ($answer ne 'ok') {
          &logthis("Init reply for $conserver: >$answer<");
          my $st=120+int(rand(240));
          &logthis(
   "<font color=blue>WARNING: Init failed $conserver ($st secs)</font>");
          sleep($st);
          exit; 
   }
   
   sleep 5;
   &status("Ponging $conserver");
   print $remotesock "pong\n";
   $answer=<$remotesock>;
   chomp($answer);
   if ($answer!~/^$converver/) {
      &logthis("Pong reply for $conserver: >$answer<");
   }
   # ----------------------------------------------------------- Initialize cipher
   
   &status("Initialize cipher: $conserver");
   print $remotesock "ekey\n";
   my $buildkey=<$remotesock>;
   my $key=$conserver.$perlvar{'lonHostID'};
   $key=~tr/a-z/A-Z/;
   $key=~tr/G-P/0-9/;
   $key=~tr/Q-Z/0-9/;
   $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
   $key=substr($key,0,32);
   my $cipherkey=pack("H32",$key);
   if ($cipher=new IDEA $cipherkey) {
      &logthis("Secure connection initialized: $conserver");
   } else {
      my $st=120+int(rand(240));
      &logthis(
        "<font color=blue>WARNING: ".
        "Could not establish secure connection, $conserver ($st secs)!</font>");
      sleep($st);
      exit;
   }
   
   }
   
   # ----------------------------------- POD (plain old documentation, CPAN style)
   
   =head1 NAME
   
   lonc - LON TCP-MySQL-Server Daemon for handling database requests.
   
   =head1 SYNOPSIS
   
   Should only be run as user=www.  This is a command-line script which
   is invoked by loncron.
   
   =head1 DESCRIPTION
   
   Provides persistent TCP connections to the other servers in the network
   through multiplexed domain sockets
   
    PID in subdir logs/lonc.pid
    kill kills
    HUP restarts
    USR1 tries to open connections again
   
   =head1 README
   
   Not yet written.
   
   =head1 PREREQUISITES
   
   POSIX
   IO::Socket
   IO::Select
   IO::File
   Socket
   Fcntl
   Tie::RefHash
   Crypt::IDEA
   
   =head1 COREQUISITES
   
   =head1 OSNAMES
   
   linux
   
   =head1 SCRIPT CATEGORIES
   
   Server/Process
   
   =cut
Removed from v.1.22  
changed lines
  Added in v.1.29

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