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Diff for /loncom/lond between versions 1.142 and 1.146

version 1.142, 2003/09/09 20:47:46 version 1.146, 2003/09/16 10:28:14
Line 60 Line 60
 # 09/08/2003 Ron Fox:  Told lond to take care of change logging so we  # 09/08/2003 Ron Fox:  Told lond to take care of change logging so we
 #      don't have to remember it:  #      don't have to remember it:
 # $Log$  # $Log$
   # Revision 1.146  2003/09/16 10:28:14  foxr
   # ReinitProcess - decode the process selector and produce the associated pid
   # filename.  Note: While it is possible to test that valid process selectors are
   # handled properly I am not able to test that invalid process selectors produce
   # the appropriate error as lonManage also blocks the use of invalid process selectors.
   #
   # Revision 1.145  2003/09/16 10:13:20  foxr
   # Added ReinitProcess function to oversee the parsing and processing of the
   # reinit:<process> client request.
   #
   # Revision 1.144  2003/09/16 09:47:01  foxr
   # Added skeletal support for SIGUSR2 (update hosts.tab)
   #
   # Revision 1.143  2003/09/15 10:03:52  foxr
   # Completed and tested code for pushfile.
   #
 # Revision 1.142  2003/09/09 20:47:46  www  # Revision 1.142  2003/09/09 20:47:46  www
 # Permanently store chatroom entries in chatroom.log  # Permanently store chatroom entries in chatroom.log
 #  #
Line 87  use Authen::Krb4; Line 103  use Authen::Krb4;
 use Authen::Krb5;  use Authen::Krb5;
 use lib '/home/httpd/lib/perl/';  use lib '/home/httpd/lib/perl/';
 use localauth;  use localauth;
   use File::Copy;
   
 my $DEBUG = 0;       # Non zero to enable debug log entries.  my $DEBUG = 0;       # Non zero to enable debug log entries.
   
Line 186  sub ValidManager { Line 203  sub ValidManager {
     }      }
 }  }
 #  #
   #  CopyFile:  Called as part of the process of installing a 
   #             new configuration file.  This function copies an existing
   #             file to a backup file.
   # Parameters:
   #     oldfile  - Name of the file to backup.
   #     newfile  - Name of the backup file.
   # Return:
   #     0   - Failure (errno has failure reason).
   #     1   - Success.
   #
   sub CopyFile {
       my $oldfile = shift;
       my $newfile = shift;
   
       #  The file must exist:
   
       if(-e $oldfile) {
   
    # Read the old file.
   
    my $oldfh = IO::File->new("< $oldfile");
    if(!$oldfh) {
       return 0;
    }
    my @contents = <$oldfh>;  # Suck in the entire file.
   
    # write the backup file:
   
    my $newfh = IO::File->new("> $newfile");
    if(!(defined $newfh)){
       return 0;
    }
    my $lines = scalar @contents;
    for (my $i =0; $i < $lines; $i++) {
       print $newfh ($contents[$i]);
    }
   
    $oldfh->close;
    $newfh->close;
   
    chmod(0660, $newfile);
   
    return 1;
       
       } else {
    return 0;
       }
   }
   
   #
   #   InstallFile: Called to install an administrative file:
   #       - The file is created with <name>.tmp
   #       - The <name>.tmp file is then mv'd to <name>
   #   This lugubrious procedure is done to ensure that we are never without
   #   a valid, even if dated, version of the file regardless of who crashes
   #   and when the crash occurs.
   #
   #  Parameters:
   #       Name of the file
   #       File Contents.
   #  Return:
   #      nonzero - success.
   #      0       - failure and $! has an errno.
   #
   sub InstallFile {
       my $Filename = shift;
       my $Contents = shift;
       my $TempFile = $Filename.".tmp";
   
       #  Open the file for write:
   
       my $fh = IO::File->new("> $TempFile"); # Write to temp.
       if(!(defined $fh)) {
    &logthis('<font color="red"> Unable to create '.$TempFile."</font>");
    return 0;
       }
       #  write the contents of the file:
   
       print $fh ($Contents); 
       $fh->close; # In case we ever have a filesystem w. locking
   
       chmod(0660, $TempFile);
   
       # Now we can move install the file in position.
       
       move($TempFile, $Filename);
   
       return 1;
   }
   
   #
 #   PushFile:  Called to do an administrative push of a file.  #   PushFile:  Called to do an administrative push of a file.
 #              - Ensure the file being pushed is one we support.  #              - Ensure the file being pushed is one we support.
 #              - Backup the old file to <filename.saved>  #              - Backup the old file to <filename.saved>
Line 229  sub PushFile { Line 337  sub PushFile {
     #      #
     my $backupfile = $tablefile;      my $backupfile = $tablefile;
     $backupfile    =~ s/\.tab$/.old/;      $backupfile    =~ s/\.tab$/.old/;
     # CopyFile($tablefile, $backupfile);      if(!CopyFile($tablefile, $backupfile)) {
    &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
    return "error:$!";
       }
     &logthis('<font color="green"> Pushfile: backed up '      &logthis('<font color="green"> Pushfile: backed up '
     .$tablefile." to $backupfile</font>");      .$tablefile." to $backupfile</font>");
           
     #  Install the new file:      #  Install the new file:
   
     # InstallFile($tablefile, $contents);      if(!InstallFile($tablefile, $contents)) {
    &logthis('<font color="red"> Pushfile: unable to install '
    .$tablefile." $! </font>");
    return "error:$!";
       }
       else {
    &logthis('<font color="green"> Installed new '.$tablefile
    ."</font>");
   
       }
   
   
     #  Indicate success:      #  Indicate success:
     
     return "ok";      return "ok";
   
 }  }
   
   #
   #  Called to re-init either lonc or lond.
   #
   #  Parameters:
   #    request   - The full request by the client.  This is of the form
   #                reinit:<process>  
   #                where <process> is allowed to be either of 
   #                lonc or lond
   #
   #  Returns:
   #     The string to be sent back to the client either:
   #   ok         - Everything worked just fine.
   #   error:why  - There was a failure and why describes the reason.
   #
   #
   sub ReinitProcess {
       my $request = shift;
   
   
       # separate the request (reinit) from the process identifier and
       # validate it producing the name of the .pid file for the process.
       #
       #
       my ($junk, $process) = split(":", $request);
       my $processpidfile = $perlvar{'lonDaemons'}.'/';
       if($process eq 'lonc') {
    $processpidfile = $processpidfile."lonc.pid";
       } elsif ($process eq 'lond') {
    $processpidfile = $processpidfile."lond.pid";
       } else {
    &logthis('<font color="yellow" Invalid reinit request for '.$process
    ."</font>");
    return "error:Invalid process identifier $process";
       }
       &logthis('<font color="red"> Reinitializing '.$process." </font>");
       return 'ok';
   }
   
 #  #
 #  Convert an error return code from lcpasswd to a string value.  #  Convert an error return code from lcpasswd to a string value.
 #  #
Line 377  sub HUPSMAN {                      # sig Line 537  sub HUPSMAN {                      # sig
     exec("$execdir/lond");         # here we go again      exec("$execdir/lond");         # here we go again
 }  }
   
   #
   #   Called in response to a USR2 signal.
   #   - Reread hosts.tab
   #   - All children connected to hosts that were removed from hosts.tab
   #     are killed via SIGINT
   #   - All children connected to previously existing hosts are sent SIGUSR1
   #   - Our internal hosts hash is updated to reflect the new contents of
   #     hosts.tab causing connections from hosts added to hosts.tab to
   #     now be honored.
   #
   sub UpdateHosts {
   }
   
 sub checkchildren {  sub checkchildren {
     &initnewstatus();      &initnewstatus();
     &logstatus();      &logstatus();
Line 619  $SIG{CHLD} = \&REAPER; Line 792  $SIG{CHLD} = \&REAPER;
 $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
 $SIG{HUP}  = \&HUPSMAN;  $SIG{HUP}  = \&HUPSMAN;
 $SIG{USR1} = \&checkchildren;  $SIG{USR1} = \&checkchildren;
   $SIG{USR2} = \&UpdateHosts;
   
   
 # --------------------------------------------------------------  # --------------------------------------------------------------
Line 828  sub make_new_child { Line 1001  sub make_new_child {
        if ($wasenc == 1) {         if ($wasenc == 1) {
    my $cert = GetCertificate($userinput);     my $cert = GetCertificate($userinput);
    if(ValidManager($cert)) {     if(ValidManager($cert)) {
        print $client "ok\n";         chomp($userinput);
          my $reply = ReinitProcess($userinput);
          print $client  "$reply\n";
    } else {     } else {
        print $client "refused\n";         print $client "refused\n";
    }     }
Line 2393  each connection is logged. Line 2568  each connection is logged.
   
 =item *  =item *
   
   SIGUSR2
   
   Parent Signal assignment:
       $SIG{USR2} = \&UpdateHosts
   
   Child signal assignment:
       NONE
   
   
   =item *
   
 SIGCHLD  SIGCHLD
   
 Parent signal assignment:  Parent signal assignment:
Removed from v.1.142  
changed lines
  Added in v.1.146

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