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Diff for /loncom/Attic/lonManage between versions 1.6 and 1.12

version 1.6, 2003/08/12 11:02:59 version 1.12, 2003/08/18 11:08:07
Line 50 Line 50
 #    not the IP address of the host.  #    not the IP address of the host.
 #  #
 #  $Log$  #  $Log$
   #  Revision 1.12  2003/08/18 11:08:07  foxr
   #  Debug request building in Transact.
   #
   #  Revision 1.11  2003/08/18 10:45:32  foxr
   #  Felt strongly enough about hoisting ReadConfiguration into a separate sub
   #  that I did it now before I forgot.
   #
   #  Revision 1.10  2003/08/18 10:43:31  foxr
   #  Code/test ValidHost.  The hosts.tab and the perl variables are read in as
   #  global hashes as a side effect.  May later want to clean this up by making
   #  a separate getconfig function and hoisting the config reads into that.
   #
   #  Revision 1.9  2003/08/18 10:25:46  foxr
   #  Write ReinitProcess function in terms of ValidHost and Transact.
   #
   #  Revision 1.8  2003/08/18 10:18:21  foxr
   #  Completed PushFile function in terms of
   #  - ValidHost - Determines if target host is valid.
   #  - Transact  - Performs one of the valid transactions with the
   #                appropriate lonc<-->lond client/server pairs.
   #
   #  Revision 1.7  2003/08/18 09:56:01  foxr
   #  1. Require to be run as root.
   #  2. Catch case where no operation switch is supplied and put out usage.
   #  3. skeleton/comments for PushFile function.
   #
 #  Revision 1.6  2003/08/12 11:02:59  foxr  #  Revision 1.6  2003/08/12 11:02:59  foxr
 #  Implement command switch dispatching.  #  Implement command switch dispatching.
 #  #
Line 66 Line 92
 #  Add usage and skeleton documentation.  #  Add usage and skeleton documentation.
 #  #
 #  #
   
   # Modules required:
   
   use strict; # Because it's good practice.
   use English; # Cause I like meaningful names.
 use Getopt::Long;  use Getopt::Long;
   use LONCAPA::Configuration; # To handle configuration I/O.
   
   # File scoped variables:
   
   my %perlvar; # Perl variable defs from apache config.
   my %hostshash; # Host table as a host indexed hash.
   
 sub Usage  {  sub Usage  {
     print "Usage:";      print "Usage:";
Line 80  sub Usage  { Line 117  sub Usage  {
     lonManage  --reinit=lonc host      lonManage  --reinit=lonc host
            Sends a HUP signal to the remote systems's lond.             Sends a HUP signal to the remote systems's lond.
   
     lonmanage  --reinit=lond host      lonManage  --reinit=lond host
           Requests the remote system's lond perform the same action as if            Requests the remote system's lond perform the same action as if
           it had received a HUP signal.            it had received a HUP signal.
   
Line 116  USAGE Line 153  USAGE
   
 sub ParseArgs {  sub ParseArgs {
     my $pushing   = '';      my $pushing   = '';
     my $reiniting = '';      my $reinitting = '';
   
     if(!GetOptions('push=s'    => \$pushing,      if(!GetOptions('push=s'    => \$pushing,
            'reinit=s'  => \$reinitting)) {             'reinit=s'  => \$reinitting)) {
Line 171  sub ParseArgs { Line 208  sub ParseArgs {
           
     return @result;      return @result;
 }  }
   #
   #  Read the loncapa configuration stuff.
   #
   sub ReadConfig {
       my $perlvarref = LONCAPA::Configuration::read_conf('loncapa.conf');
       %perlvar       = %{$perlvarref};
       my $hoststab   = LONCAPA::Configuration::read_hosts(
    "$perlvar{'lonTabDir'}/hosts.tab");
       %hostshash     = %{$hoststab};
   
   }
   #
   #  Determine if the target host is valid.
   #  This is done by reading the current hosts.tab file.
   #  For the host to be valid, it must be inthe file.
   #
   #  Parameters:
   #     host   - Name of host to check on.
   #  Returns:
   #     true   if host is valid.
   #     false  if host is invalid.
   #
   sub ValidHost {
       my $host       = shift;
      
       ReadConfig;
   
       return defined $hostshash{$host};
   
   }
   #
   #  Performs a transaction with lonc.
   #  By the time this is called, the transaction has already been
   #  validated by the caller.
   #
   #   Parameters:
   #
   #   host    - hosts.tab name of the host whose lonc we'll be talking to.
   #   command - The base command we'll be asking lond to execute.
   #   body    - [optional] If supplied, this is a command body that is a ref.
   #             to an array of lines that will be appended to the 
   #             command.
   #
   #  NOTE:
   #    The command will be done as an encrypted operation.
   #
   sub Transact {
       my $host    = shift;
       my $command = shift;
       my $haveBody= 0;
       my $body;
       my $i;
   
       if(scalar @ARG) {
    $body = shift;
    $haveBody = 1;
       }
       #  Construct the command to send to the server:
       
       my $request = "encrypt\:"; # All requests are encrypted.
       $request   .= $command;
       if($haveBody) {
    $request .= "\:";
    my $bodylines = scalar @$body;
    for($i = 0; $i < $bodylines; $i++) {
       $request .= $$body[$i];
    }
       } else {
    $request .= "\n";
       }
       # Body is now built..
   
       print "$request";
   }
   #
   #   Called to push a file to the remote system.
   #   The only legal files to push are hosts.tab and domain.tab.
   #   Security is somewhat improved by
   #   
   #   - Requiring the user run as root.
   #   - Connecting with lonc rather than lond directly ensuring this is a loncapa
   #     host
   #   - We must appear in the remote host's hosts.tab file.
   #   - The host must appear in our hosts.tab file.
   #
   #  Parameters:
   #     tablename - must be one of hosts or domain.
   #     tablefile - name of the file containing the table to push.
   #     host      - name of the host to push this file to.     
   #
   sub PushFile {
       my $tablename = shift;
       my $tablefile = shift;
       my $host      = shift;
       
       # Open the table file:
   
       if(!open(TABLEFILE, "<$tablefile")) {
    die "ENOENT - No such file or directory $tablefile";
       }
     
       # Require that the host be valid:
   
       if(!ValidHost($host)) {
    die "EHOSTINVAL - Invalid host $host"; # Ok so I invented this 'errno'.
       }
       # Read in the file.  If the table name is valid, push it.
   
       my @table = <TABLEFILE>; #  These files are pretty small.
       close TABLEFILE;
   
       if( ($tablename eq "host")    ||
    ($tablename eq "domain")) {
    Transact($host, "pushfile:$tablename",\@table);
       } else {
    die "EINVAL - Invalid parameter. tablename: $tablename must be host or domain";
       }
   }
   #
   #   This function is called to reinitialize a server in a remote host.
   #   The servers that can be reinitialized are:
   #   - lonc   - The lonc client process.
   #   - lond   - The lond daemon.
   #  NOTE:
   #    Reinitialization in this case means re-scanning the hosts table,
   #    starting new lond/lonc's as approprate and stopping existing lonc/lond's.
   #
   #  Parameters:
   #     process - The name of the process to reinit (lonc or lond).
   #     host    - The host in which this reinit will happen.
   #
   sub ReinitProcess {
       my $process = shift;
       my $host    = shift;
   
       #  Ensure the host is valid:
       
       if(!ValidHost($host)) {
    die "EHOSTINVAL - Invalid host $host";
       }
       # Ensure target process selector is valid:
   
       if(($process eq "lonc") ||
          ($process eq "lond")) {
    Transact($host, "reinit:$process");
       } else {
    die "EINVAL -Invalid parameter. Process $process must be lonc or lond";
       }
   }
 #--------------------------- Entry point: --------------------------  #--------------------------- Entry point: --------------------------
   
 #  Parse the parameters  #  Parse the parameters
 #  If command parsing failed, then print usage:  #  If command parsing failed, then print usage:
   
 @params = ParseArgs;  my @params   = ParseArgs;
 $nparam   = @params;  my $nparam   = @params;
   
 if($nparam == 0) {  if($nparam == 0) {
     Usage;      Usage;
     exit -1;      exit -1;
 }  }
   #
   #   Next, ensure we are running as EID root.
 sub PushFile {  #
     print "Pushing a file\n";  if ($EUID != 0) {
       die "ENOPRIV - No privilege for requested operation"
 }  }
   
 sub ReinitProcess {  
     print "Reinitializing a process\n";  
 }  
   
 #   Based on the operation requested invoke the appropriate function:  #   Based on the operation requested invoke the appropriate function:
   
 $operation = shift @params;  my $operation = shift @params;
   
 if($operation eq "push") {  # push tablename filename host  if($operation eq "push") {  # push tablename filename host
     $tablename = shift @params;      my $tablename = shift @params;
     $tablefile = shift @params;      my $tablefile = shift @params;
     $host      = shift @params;      my $host      = shift @params;
     PushFile($tablename, $tablefile, $host);      PushFile($tablename, $tablefile, $host);
   
 }  } elsif($operation eq "reinit") { # reinit processname host.
 if($operation eq "reinit") { # reinit processname host.      my $process   = shift @params;
     $process   = shift @params;      my $host      = shift @params;
     $host      = shift @params;  
     ReinitProcess($process, $host);      ReinitProcess($process, $host);
 }  }
   else {
       Usage;
   }
 exit 0;  exit 0;
   
 =head1 NAME  =head1 NAME
Line 240  Usage: Line 425  Usage:
   
 =head1 PREREQUISITES  =head1 PREREQUISITES
   
   =item strict
 =item Getopt::Long  =item Getopt::Long
   =item English
   
 =head1  CATEGORIES  =head1  CATEGORIES
     Command line utility      Command line utility
Removed from v.1.6  
changed lines
  Added in v.1.12

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