#!/usr/bin/perl
# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
#(C)IBM Corp

#

#-----------------------------------------------------------------------------

=head1   servicenode 

 This updates the service node with files necessary to access the 
 database on the MasterNode and restarts the xcat daemon

 On AIX systems this does the service node configuration.

=cut

#-----------------------------------------------------------------------------

BEGIN
{
    $::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : '/opt/xcat';
}
use lib "$::XCATROOT/lib/perl";

# MAIN
use strict;
use IO::Socket;
use IO::Socket::SSL;
use xCAT::Utils;

# MAIN

my $rc=0;
my $msg="";

$::osname = `uname`;
chomp $::osname;

$::sdate = `/bin/date`;
chomp $::sdate;

$::hname = `hostname`;
chomp $::hname;

if ($::osname eq 'AIX')
{
	# AIX service node setup
	$rc = &setupAIXsn;
	if ( $rc != 0) {
		my $msg="$::sdate  servicenode: One or more errors occurred when attempting to configure node $::hname as an xCAT service node.\n";
#		print "$msg\n";
		`logger -t xcat $msg`;
	}
} 
else
{
	# Linux setup
	#  remove OpenIPMI-tools and tftp
	#  install xcat from /install/xcat
	#  Copy Certificates, and config file to apprpriate directories 
	#  from /install and restart xcatd
	&runcmd("rpm -e OpenIPMI-tools");

	&runcmd("rpm -e tftp-server");
	if ($ENV{'NODESETSTATE'} eq "install")
	{
    	$msg = "Installing xCAT";
    	`logger -t xcat $msg`;
    	&runcmd("rpm -ivh /xcatpost/xcat/RPMS/*/*.rpm");
	}
	&runcmd("/opt/xcat/sbin/copycerts");
}

exit $rc;

#
# Subroutines
#

# run the command
sub runcmd
{
    my ($cmd) = @_;
    my $rc=0;

    $cmd .= ' 2>&1' ;
    my $outref = [];
    @$outref = `$cmd`;
    if ($?)
    {
        $rc = $? >> 8;
        if ($rc > 0)
        {
            my $msg="$cmd returned rc=$rc @$outref\n";
            `logger -t xcat $msg`;
        }
    }
	return 0;
}

# do AIX service node setup
sub setupAIXsn
{
	my $error=0;

	# get the name of my service node/NIM master from the MASTER env var
	$::servnode = $ENV{'MASTER'};

	# makes it a service node 
	if (&runcmd("touch /etc/xCATSN") != 0 ) {
		$msg = "$::sdate servicenode: Could not touch /etc/xCATSN\n";
        `logger -t xcat $msg`;
    }

	# make sure we don't have xCATMN file 
	if (-f "/etc/xCATMN") {
		if (&runcmd("rm  /etc/xCATMN") != 0 ) {
			$msg = "$::sdate servicenode: Could not remove /etc/xCATMN\n";
			`logger -t xcat $msg`;
		}
	}

	# call copycerts
    if (&runcmd("/opt/xcat/sbin/copycerts") != 0) {
        $msg = "$::sdate servicenode: Could not run copycerts.\n";
        `logger -t xcat $msg`;
    }

    # get the xCAT credentials from the server
	&getcreds;

	# start xcatd
	if (&runcmd("/opt/xcat/sbin/xcatd &") != 0) {
		$msg = "$::sdate servicenode: Could not start xcatd.\n";
        `logger -t xcat $msg`;
    }

	# add xcatd to /etc/inittab???
	my $mkitab_cmd = 'mkitab "xcatd:2:once:/opt/xcat/sbin/xcatd > /dev/console 2>&1"';

	if (&runcmd($mkitab_cmd) != 0) {
		# error might just mean that the entry is already there!

	#	$msg = "$::sdate servicenode: Could not add xcatd to /etc/inittab.\n";
    #    `logger -t xcat $msg`;
    }

	# do nim master setup - master fileset already installed
	if (&runcmd("nim_master_setup -a mk_resource=no") != 0) {
		$msg = "$::sdate servicenode: Could not run nim_master_setup.\n";
        `logger -t xcat $msg`;
    }

	#
	# TODO - can configure NIM to use SSL - "nimconfig -c"
	#   !!!!! can't do diskless nodes w/ nimsh & SSL enabled!!!!
	#

	return 0;
}

#####################################################
#
#  getcreds
#		Get xCAT credentials and DB cfgloc file
#
#####################################################
sub getcreds
{
	my $response=&getresponse("xcat_client_cred");
	if (defined ($response) ) {
		my $fd;
		my $filename = "/.xcat/client-cred.pem";
		&runcmd("mkdir -p /.xcat");
		&runcmd("chmod 700 /.xcat > /dev/null 2>&1");
		open($fd, '>',$filename);
		print $fd $response;
		close($fd);

		# set the permissions
		my $cmd = "chmod 600 $filename > /dev/null 2>&1";
		&runcmd($cmd);
	}
	else {
		$msg = "$::sdate servicenode: Could not get client-cred.pem file.\n";
		`logger -t xcat $msg`;
	}

	my $response=&getresponse("xcat_server_cred");
	if (defined ($response) ) {
		my $fd;
		my $filename = "/etc/xcat/cert/server-cred.pem";
		&runcmd("mkdir -p /etc/xcat/cert"); 
		open($fd, '>',$filename);
		print $fd $response;
		close($fd);

		# set the permissions
		my $cmd = "chmod 600 /etc/xcat/cert/* > /dev/null 2>&1";
		&runcmd($cmd);
	}
	else {
        $msg = "$::sdate servicenode: Could not get server-cred.pem file.\n";
        `logger -t xcat $msg`;
    }

	my $response=&getresponse("xcat_cfgloc");
	if (defined ($response) ) {
		# need to change entry to use the name of the server as
		#       know by this node
		my ($begin, $tmp) = split(';', $response);
		my ($tmp2, $end, $end2) = split('\|', $tmp);
		my ($tmp3, $oldserv) = split('=', $tmp2);
		my $newstr = "$begin;$tmp3=$::servnode|$end|$end2";
		my $fd;
		my $filename = "/etc/xcat/cfgloc";
		&runcmd("mkdir -p /etc/xcat");
		open($fd, '>',$filename);
		print $fd $newstr;
		close($fd);

		# set the permissions
		my $cmd = "chmod 600 $filename > /dev/null 2>&1";
		&runcmd($cmd);
	}
	else {
        $msg = "$::sdate servicenode: Could not get cfgloc file.\n";
        `logger -t xcat $msg`;
    }

	return 0;
}

#####################################################
#
#  getresponse
#       Request info from xcatd on the management node
#
#	- uses SSL socket on port 3001 to connect to MN xcatd
#		to make the request for info
#
#####################################################
sub getresponse
{
	my ($req) = @_;

	my $port = "3001";

	# open listener connection to wait for check from management node
	my $lpid = &openlistener();

	# open a socket to request credentials
	my $sock = IO::Socket::SSL->new(
		PeerAddr => $::servnode,
		PeerPort  => $port,
		Proto    => 'tcp',
	);

	unless ($sock) {
		my $msg = "servicenode: Cannot connect to host \'$::servnode\'\n";
		`logger -t xcat $msg`;
		print $msg;
		return undef;
	}

	# request must be in XML format
	print $sock "<xcatrequest>\n";
	print $sock "   <command>getcredentials</command>\n";
	print $sock "   <arg>$req</arg>\n";
	print $sock "   <callback_port>300</callback_port>\n";
	print $sock "</xcatrequest>\n";

#TODO - do we have to try again after waiting for a bit????
	my $response='';
	my $line;
	while (defined ($line = <$sock>)) {
		# skip xml tags
		next if ($line =~ /^\s*</);

		# once we get to serverdone we have the whole response
		if ($line =~ m/<\/serverdone>/) {
			last:
		}
		$response .= $line;
	}

	close ($sock);
#print "resp = \'$response\'\n";

	kill 2, $lpid;
	if ($response) {
		return $response;
	}
	return undef;
}

#####################################################
#
#  openlistener
#   - fork a child process to respond to a check from the MN
#
#####################################################
sub openlistener
{
	my $node = $ENV{'NODE'};

	# fork a child process to open a socket to listen for communication 
	#	from the server
	my $pid = xCAT::Utils->xfork;
	unless (defined $pid) {
		# fork failed
		$msg = "servicenode: Could not fork process.\n";
		`logger -t xcat $msg`;
		#print $msg;
		return undef;
	}

	if ($pid != 0) {
        # This is the parent process, just return 
        return $pid;
    }

	my $listener = IO::Socket::INET->new(
		LocalPort  => '300',
		Proto    => 'tcp',
		Listen  => '64',
		Reuse => 1
	);

	unless ($listener) {
       	my $msg = "servicenode: Cannot open socket on \'$node\'\n";
   		`logger -t xcat $msg`;
		print $msg;
       	exit 1;
   	}

	#	xcatd sends a quick req to see if we are really asking
	#  	for info - this listener checks for the req and says ok
	my $client;
	while ($client = $listener->accept()) {
		# $client is the new connection   
		my $text=<$client>;

    	#  see if we got "CREDOKBYYOU?"
		if ($text =~ /CREDOKBYYOU?/) {
			print $client "CREDOKBYME";
			close($client);
			close($listener); 
			exit 0;
		}
		close($client);
	}
	close($client);
	close($listener);
	exit 0;
}