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

#

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

=head1   servicenode 

 On AIX and Linux :
 This updates the service node with files necessary to access the 
 database on the MasterNode and restarts the xcat daemon
 If uses multiple environment variables setup  by postage.pm from 
 the site table.
 For Linux:
   It calls xcatserver and xcatclient script to get the ssh keys, ssl
   redentials and cfgloc file and transfer from the MN to the SN 
   to be able to access the 
   database,  setup ssh keys on the nodes and have daemon to daemon
   commmunication between the SN and MN and have the SN access the DB.
 For AIX:
   The same function in xcatserver and xcatclient is in this script for 
   AIX and thus it does not call xcatserver and xcatclient.
   We get the ssh keys, ssl 
   credentials and cfgloc file for the SN to be able to access the 
   database,  setup ssh keys on the nodes and have daemon to daemon
   commmunication between the SN and MN and have the SN access the DB.
 

=cut

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

BEGIN
{
    $::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : '/opt/xcat';
}

# if AIX - make sure we include perl 5.8.2 in INC path.
#       Needed to find perl dependencies shipped in deps tarball.
if ($^O =~ /^aix/i) {
        use lib "/usr/opt/perl5/lib/5.8.2/aix-thread-multi";
        use lib "/usr/opt/perl5/lib/5.8.2";
        use lib "/usr/opt/perl5/lib/site_perl/5.8.2/aix-thread-multi";
        use lib "/usr/opt/perl5/lib/site_perl/5.8.2";
}

use lib "$::XCATROOT/lib/perl";
use strict;
use xCAT::Utils;
# MAIN
use IO::Socket;

my $useSocketSSL=eval { require IO::Socket::SSL; };
if ($useSocketSSL) {
	require IO::Socket::SSL;
}

# MAIN

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

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

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

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

my $installdir = $ENV{'INSTALLDIR'};
if (!$installdir) {
    $installdir="/install";
}
chomp $installdir;
$installdir =~ s/^(\'|\")(.*)(\"|\')$/$2/; # remove any surrounding quotes

# update security certificates keys for service node
# This section is used for the updatenode -k function, which sets the
# UPDATESECURITY env variable
if ($ENV{UPDATESECURITY} && $ENV{UPDATESECURITY} eq "1") {
    $::servnode = $ENV{'MASTER'};

    # only run for service node
    if (! -f "/etc/xCATSN") {
        exit 0;
    }

    # copy the postscripts to /install/postscripts, if not mounted
    my $mounted = xCAT::Utils->isMounted($installdir);
    if ($mounted == 0) { # not mounted
      if (&runcmd("mkdir -p $installdir/postscripts; cp -p -R /xcatpost/* $installdir/postscripts > /dev/null 2>&1") != 0 ) {
        $msg = "$::sdate servicenode: Could not copy postscripts to $installdir/postscripts.\n";
        `logger -t xcat $msg`;
      }
    }

    # copy the certificates
      &copycerts;
    if ($::osname eq 'AIX') {
        # get the xCAT credentials from the server
        &getcreds;
    } else {   # Linux
      # call xcatserver,xcatclient to transfer the SSL credentials and cfgloc
       `logger -t $::sdate servicenode:  running xcatserver -d`;
	&runcmd("xcatserver -d");
       `logger -t $::sdate servicenode: running xcatclient -d`;
	&runcmd("xcatclient -d");
    }
    
    exit 0;
}



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");

         &copycerts;
        
       `logger -t $::sdate servicenode:  runing xcatserver -d`;
	&runcmd("xcatserver -d");
       `logger -t $::sdate servicenode: runing xcatclient -d`;
	&runcmd("xcatclient -d");
}

`logger -t $::sdate servicenode:  rc=$rc`;
exit $rc;

#
# Subroutines
#

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

    $cmd .= ' 2>&1' ;

   # my $outref = [];
   # @$outref = `$cmd`;

	$::outref = [];
	$::outref = `$cmd`;
    if ($?)
    {
        $rc = $? >> 8;
        if ($rc > 0)
        {
            my $msg="$::sdate servicenode: $cmd returned rc=$rc $::outref\n";
            `logger -t xcat $msg`;
			return 1;
        }
    }
	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`;
    }

	# copy the postscripts to /install/postscripts
	if (&runcmd("mkdir -p $installdir/postscripts; cp -p -R /xcatpost/* $installdir/postscripts > /dev/null 2>&1") != 0 ) {
		$msg = "$::sdate servicenode: Could not copy postscripts to $installdir/postscripts.\n";
		`logger -t xcat $msg`;
	}

	# check if /install/postscripts is in /etc/exports
    if (&runcmd("/bin/cat /etc/exports 2>/dev/null | grep '$installdir/postscripts ' >/dev/null 2>&1")  != 0) {
        # if not add it and make sure it is exported
        if (&runcmd("echo '$installdir/postscripts -ro' >> /etc/exports; exportfs -a") !=0 ) {
            $msg = "$::sdate servicenode: Could not update the /etc/exports file.\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
        &copycerts;
	# get the xCAT credentials from the server
	&getcreds;

	# Add the xcatd subsystem to the AIX
	my $mkssys_cmd = "mkssys -p $::XCATROOT/sbin/xcatd -s xcatd -u 0 -S -n 15 -f 15 -a '-f' ";

	if (&runcmd($mkssys_cmd) != 0) {
		$msg = "$::sdate servicenode: Could not create subsystem for xcatd. It maybe already have been added.\n";
		`logger -t xcat $msg`;
	}

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

	# add xcatd to /etc/inittab???
	my $mkitab_cmd = qq~/usr/sbin/mkitab "xcatd:2:once:$::XCATROOT/sbin/restartxcatd > /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`;
	}

	# set ulimit - so we can copy over large files - like spot
	if (&runcmd("/usr/bin/chuser fsize=-1 root") != 0) {
		$msg = "$::sdate servicenode: Could not change ulimit\n";
		`logger -t xcat $msg`;
	}

	# stop inetd, make sure bootp & tftp are in /etc/inetd.conf and restart
    if (&runcmd("stopsrc -s inetd") != 0) {
        $msg = "$::sdate servicenode: Could not stop inetd.\n";
        `logger -t xcat $msg`;
    }

    my $tmp_inetd_file = "/etc/inetd.conf.tmp";
    unless (open(TMPINETD, ">>$tmp_inetd_file")) {
        $msg = "$::sdate servicenode: Could not open $tmp_inetd_file.\n";
        `logger -t xcat $msg`;
    }

    my $inetd_file_name = "/etc/inetd.conf";
    unless (open(INETDFILE, "<$inetd_file_name")) {
        $msg = "$::sdate servicenode: Could not open $inetd_file_name.\n";
        `logger -t xcat $msg`;
    }

    while (my $l = <INETDFILE>) {
        chomp $l;
        if (($l =~ /bootps/) || ($l =~ /tftp/)) {
            $l =~ s/^\s*#/$1/;
            print TMPINETD $l . "\n";
        } else {
            print TMPINETD $l . "\n";
        }
    }
    close (TMPINETD);
    close (INETDFILE);

	if (&runcmd("mv $tmp_inetd_file $inetd_file_name > /dev/null 2>&1") != 0) {
        $msg = "$::sdate servicenode: Could not update /etc/inetd.conf.\n";
        `logger -t xcat $msg`;
    }

    if (&runcmd("startsrc -s inetd") != 0) {
        $msg = "$::sdate servicenode: Could not restart inetd.\n";
        `logger -t xcat $msg`;
    }

	# do nim master setup - master fileset already installed
    if (&runcmd("/usr/sbin/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!!!!
	#

	# restore the original .rhosts that was removed by NIM setup
	if (&runcmd("cp /.rhosts.prev /.rhosts ") != 0 ) {
		$msg = "$::sdate servicenode: Could not restore the .rhosts file.\n";
		`logger -t xcat $msg`;
	}

	return 0;
}

#####################################################
#
#  getcreds ( For AIX)  . 
# Same function in xcatserver,xcatclient for Linux
#   Get xCAT SSL 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`;
	}

	$response=&getresponse("xcat_server_cred");
	if (defined ($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`;
    }

	$response=&getresponse("xcat_cfgloc");
	if (defined ($response) ) {
	# need to change entry to use the name of the server as
	#       know by this node
        # except for db2 which has a different format, no host
        my $newstr;
        if ($response =~ /^DB2:/){ 
           $newstr = $response;
        } else {
	      my ($begin, $tmp) = split(';', $response);
              my ($tmp2, $end, $end2) = split('\|', $tmp);
              my ($tmp3, $oldserv) = split('=', $tmp2);
	      $newstr = "$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";
	my $node = $ENV{'NODE'};

	# 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',
	);

	# try a few more times
	my $times=1;  
	while (!$sock) {
		sleep(2);
		$times++;
		$sock = IO::Socket::SSL->new(
        	PeerAddr => $::servnode,
        	PeerPort  => $port,
        	Proto    => 'tcp',
    	);	
		if ($times == 5) {
			last;
		}
	}

	unless ($sock) {
		my $msg = "$::sdate 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'};

    require xCAT::Utils;
	# 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
		$msg = "$::sdate 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 $msg = "$::sdate 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;
}
#####################################################
#
# copycerts 
# Setup the /etc/xcat/ca, /etc/xcat/cert, ~/.xcat directories with
# SSL certificates from the /xcatpost/_xcat directory
# These certificate are needed to access the Databases from the SN
#####################################################

sub copycerts
{
    my $rc = 0;
    `touch /etc/xCATSN`;
    # get roots home directory
    my @user= getpwuid($>);
    my $homedir=$user[7];
    if (-d "/xcatpost/_xcat")
    {
        if (!(-d "$homedir/.xcat"))
        {
            `mkdir -p $homedir/.xcat`;
            `chmod 0600 $homedir/.xcat`;
        }
        `cp -f -rp /xcatpost/_xcat/* $homedir/.xcat`;
        `chmod 0600 $homedir/.xcat/*`;
    }
    else
    {
        $msg = "$::sdate servicenode: /xcatpost/_xcat directory does not exist\n";
        `logger -t xcat $msg`;

    }
    if (-d "/xcatpost/ca")
    {
        if (!(-d "/etc/xcat"))
        {
            mkdir("/etc/xcat", 0755);
        }
        if (!(-d "/etc/xcat/ca"))
        {
            mkdir("/etc/xcat/ca", 0755);
        }
        `cp -f -rp /xcatpost/ca/* /etc/xcat/ca`;
        `chmod 0600 /etc/xcat/ca/*`;
    }
    else
    {
        $msg = "$::sdate servicenode: /xcatpost/ca directory does not exist\n";
        `logger -t xcat $msg`;

    }
    # if AIX, only need for AIX because xcatserver script does it for Linux
    if ($^O =~ /^aix/i)  {
      if (-d "/xcatpost/_xcat")
      {
        if (!(-d "/etc/xcat"))
        {
            mkdir("/etc/xcat", 0755);
        }
        if (!(-d "/etc/xcat/cert"))
        {
            mkdir("/etc/xcat/cert", 0755);
        }
        `cp -f -rp /xcatpost/_xcat/* /etc/xcat/cert`;
        `chmod 0600 /etc/xcat/cert/*`;
      }
      else
      {
        $msg = "$::sdate servicenode: /xcatpost/_xcat directory does not exist\n";
        `logger -t xcat $msg`;
      }
    }
    return $rc;
}