--- loncom/Attic/lonManage 2003/08/18 10:25:46 1.9 +++ loncom/Attic/lonManage 2003/09/16 09:49:54 1.15 @@ -3,9 +3,9 @@ # # lonManage supports remote management of nodes in a LonCAPA cluster. # -# $Id: lonManage,v 1.9 2003/08/18 10:25:46 foxr Exp $ +# $Id: lonManage,v 1.15 2003/09/16 09:49:54 foxr Exp $ # -# $Id: lonManage,v 1.9 2003/08/18 10:25:46 foxr Exp $ +# $Id: lonManage,v 1.15 2003/09/16 09:49:54 foxr Exp $ # # Copyright Michigan State University Board of Trustees # @@ -36,7 +36,7 @@ # lonManage -push newfile host # Push to the lonTabs directory. Note that # must be one of: -# hosts (hosts.tab) +# host (hosts.tab) # domain (domain.tab) # # lonManage -reinit lonc host @@ -50,6 +50,31 @@ # not the IP address of the host. # # $Log: lonManage,v $ +# Revision 1.15 2003/09/16 09:49:54 foxr +# Adjust the usage message to reflect what actually will happen on +# --reinit={lond|lonc} +# +# Revision 1.14 2003/09/08 09:45:20 foxr +# Remove BUGBUG about comment about authentication as we'll be doing +# host based authentication initially (no need for lonManage to do anything), +# and certificate based later (need at that time). +# +# Revision 1.13 2003/08/19 10:26:24 foxr +# Initial working version... tested against an unmodified lond this +# produces an unknown_cmd response which is about what I'd expect. +# +# 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. # @@ -80,25 +105,43 @@ # 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 LONCAPA::Configuration; # To handle configuration I/O. +use IO::Socket::UNIX; # To communicate with lonc. + +# File scoped variables: +my %perlvar; # Perl variable defs from apache config. +my %hostshash; # Host table as a host indexed hash. + +# +# prints out utility's command usage info. +# sub Usage { print "Usage:"; print < newfile host Push to the lonTabs directory. Note that must be one of: - hosts (hosts.tab) + host (hosts.tab) domain (domain.tab) lonManage --reinit=lonc host - Sends a HUP signal to the remote systems's lond. + Causes lonc in the remote system to reread hosts.tab and + adjust the set of clients that are being maintained to match + the new file. + lonManage --reinit=lond host - Requests the remote system's lond perform the same action as if - it had received a HUP signal. + Causes lond in the remote system to reread the hosts.tab file + and adjust the set of servers to match changes in that file. In the above syntax, the host above is the hosts.tab name of a host, not the IP address of the host. @@ -106,7 +149,30 @@ USAGE } - +# +# Lifted from lonnet.pm - and we need to figure out a way to get it back in. +# Performas a transaction with lond via the lonc proxy server. +# Parameter: +# cmd - The text of the request. +# host - The host to which the request ultimately goes. +# Returns: +# The text of the reply from the lond or con_lost if not able to contact +# lond/lonc etc. +# +sub subreply { + my ($cmd,$server)=@_; + my $peerfile="$perlvar{'lonSockDir'}/$server"; + my $client=IO::Socket::UNIX->new(Peer =>"$peerfile", + Type => SOCK_STREAM, + Timeout => 10) + or return "con_lost"; + print $client "$cmd\n"; + my $answer=<$client>; + if (!$answer) { $answer="con_lost"; } + chomp($answer); + return $answer; +} +# >>> BUGBUG <<< # # Use Getopt::Long to parse the parameters of the program. # @@ -187,10 +253,85 @@ sub ParseArgs { 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 { - return 1; + 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... transact with lond.. + + my $answer = subreply($request, $host); + + print "$answer\n"; + } # # Called to push a file to the remote system. @@ -208,6 +349,8 @@ sub Transact { # tablefile - name of the file containing the table to push. # host - name of the host to push this file to. # +# >>>BUGBUG<<< This belongs in lonnet.pm. +# sub PushFile { my $tablename = shift; my $tablefile = shift; @@ -231,7 +374,7 @@ sub PushFile { if( ($tablename eq "host") || ($tablename eq "domain")) { - Transact($host, "pushfile:$tablename:",\@table); + Transact($host, "pushfile:$tablename",\@table); } else { die "EINVAL - Invalid parameter. tablename: $tablename must be host or domain"; } @@ -249,6 +392,8 @@ sub PushFile { # process - The name of the process to reinit (lonc or lond). # host - The host in which this reinit will happen. # +# >>>BUGBUG<<<< This belongs in lonnet.pm +# sub ReinitProcess { my $process = shift; my $host = shift; @@ -338,6 +483,9 @@ Usage: =item strict =item Getopt::Long =item English +=item IO::Socket::UNIX + +=head1 KEY Subroutines. =head1 CATEGORIES Command line utility