wanassign.in 17.5 KB
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#!/usr/bin/perl -wT
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#
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# Copyright (c) 2000-2003, 2007 University of Utah and the Flux Group.
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# 
# {{{EMULAB-LICENSE
# 
# This file is part of the Emulab network testbed software.
# 
# This file is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or (at
# your option) any later version.
# 
# This file is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public
# License for more details.
# 
# You should have received a copy of the GNU Affero General Public License
# along with this file.  If not, see <http://www.gnu.org/licenses/>.
# 
# }}}
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#
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use English;
use Getopt::Std;
use Socket;
use IO::Handle;     # thousands of lines just for autoflush :-(

#
# XXX The iface stuff needs fixing. ti0/eth0. Look for strings below!
# 

sub usage()
{
    print STDOUT
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	"Usage: wanassign [-d] <pid> <eid>\n";
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    exit(-1);
}
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my  $optlist = "d";
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#
# Configure variables
#
my $TB		= "@prefix@";
my $wansolve    = "$TB/libexec/wanlinksolve";
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my $wansolveargs= "-m 4 -v";
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my $waninfo     = "$TB/libexec/wanlinkinfo";
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my $waninfoargs = "-b -m -p";
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#
# Testbed Support libraries
#
use lib "@prefix@/lib";
use libdb;
use libtestbed;
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use Node;
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# Functions
sub runwansolver();

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# Locals
my $debug	= 0;
my $failed	= 0;
my $query_result;

#
# Turn off line buffering on output
#
$| = 1;

# un-taint path
$ENV{'PATH'} = "/bin:/usr/bin:/usr/local/bin:$TB/libexec:$TB/sbin:$TB/bin";
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

#
# Parse command arguments. Once we return from getopts, all that should be
# left are the required arguments.
#
%options = ();
if (! getopts($optlist, \%options)) {
    usage();
}
if (@ARGV != 2) {
    usage();
}
if (defined($options{"d"})) {
    $debug = 1;
}
my $pid = $ARGV[0];
my $eid = $ARGV[1];

#
# Untaint args.
#
if ($pid =~ /^([-\@\w]+)$/) {
    $pid = $1;
}
else {
    die("Bad data in pid: $pid.");
}
if ($eid =~ /^([-\@\w]+)$/) {
    $eid = $1;
}
else {
    die("Bad data in eid: $eid.");
}

#
# Type map. Map between class and type (node_types table). The table
# is indexed by type, and stores the class.
#
my %typemap		= ();

#
# Hashed array of vnodes and vlans. 
# 
my %virtnodes		= ();
my %virtlans		= ();

#
# Reverse mapping from link pairs to the lan they belong to.
#
my %rlanmap		= ();

#
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# The mappings we get from the solver.
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#
my %mappings;

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# Use latest data flag. From the experiments table.
my $uselatestwadata	 = 0;

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# Wan solver weights. Also from the experiments table.
my $wa_delay_solverweight = 1.0;
my $wa_bw_solverweight    = 7.0;
my $wa_plr_solverweight   = 500.0;
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my $multiplex_factor;
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# The BOSS name in the widearea info tables.
my $boss = TBDB_WIDEAREA_LOCALNODE;

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# Nodes reserved out.
my $DEADPID = NODEDEAD_PID();
my $DEADEID = NODEDEAD_EID();

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# Signal error.
sub fatal($)
{
    my ($msg) = @_;
    
    die("*** $0:\n".
	"    $msg\n");
}

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#
# A node record (poor man struct). We create a hashed array of these,
# indexed by the vnode name.
#
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sub newnode ($$$$$) {
    my ($vname,$type,$isvirt,$isremote,$fixed) = @_;
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    printdb("  $vname $type isremote:$isremote isvirt:$isvirt " .
	    ($fixed ? $fixed : "") . " " .
            ($physnode ? $physnode : " ") . "\n");

    $virtnodes{$vname} = {
	VNAME    => $vname,
	TYPE     => $type,
	FIXED    => $fixed,	# tb-fix-node. This is the node name.
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	ISREMOTE => $isremote,
	ISLINKED => 0,		# Member of a link (all we care about).
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	ISVIRT   => $isvirt,    # is a multiplexed node.
	SOLUTION => undef,      # the solver solution. Might be same as FIXED.
	MAPPING  => undef,      # Final mapping. 
    };
}
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sub isremotenode($)	    { return $virtnodes{$_[0]}->{ISREMOTE}; }
sub isfixednode($)	    { return $virtnodes{$_[0]}->{FIXED}; }
sub isvirtnode($)	    { return $virtnodes{$_[0]}->{ISVIRT}; }
sub virtnodetype($)         { return $virtnodes{$_[0]}->{TYPE}; }
sub incvirtnodelinked($)    { return ++$virtnodes{$_[0]}->{ISLINKED}; }
sub virtnodelinked($)       { return $virtnodes{$_[0]}->{ISLINKED}; }
sub virtnodemapping($)      { return $virtnodes{$_[0]}->{MAPPING}; }
sub setvirtnodemapping($$)  { return $virtnodes{$_[0]}->{MAPPING} = $_[1]; }
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#
# A lan record (poor man struct). We create a hashed array of these,
# indexed by the vlan name. 
#
sub newvlan ($) {
    my ($vname) = @_;

    $virtlans{$vname} = {
	VNAME    => $vname,
	ISREMOTE => 0,
	MEMBERS  => [],
	COUNT    => 0,
	PARAMS   => {},
    };
}

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#
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# Get the various bits we need from the experiments table.
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#
$query_result =
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    DBQueryFatal("select uselatestwadata,wa_delay_solverweight, ".
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		 "  wa_bw_solverweight,wa_plr_solverweight,multiplex_factor ".
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		 " from experiments ".
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		 "where pid='$pid' and eid='$eid'");
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($uselatestwadata,$wa_delay_solverweight,
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 $wa_bw_solverweight,$wa_plr_solverweight,$multiplex_factor)
    = $query_result->fetchrow_array();
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if ($uselatestwadata) {
    printdb("Using latest widearea data.\n");
}
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printdb("Solver weights:\n");
printdb("  Delay:    $wa_delay_solverweight\n");
printdb("  BW:       $wa_bw_solverweight\n");
printdb("  PLR:      $wa_plr_solverweight\n");

# Add the args for the solver.
$wansolveargs .= " -1 $wa_delay_solverweight";
$wansolveargs .= " -2 $wa_bw_solverweight";
$wansolveargs .= " -3 $wa_plr_solverweight";
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#
# Get type map.
#
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$query_result =
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    DBQueryFatal("select type,class from node_types");

while (my ($type,$class) = $query_result->fetchrow_array()) {
    $typemap{$type} = $class;

    # A class is also a valid type. You know its a class cause type=class.
    if (!defined($typemap{$class})) {
	$typemap{$class} = $class;
    }
}

#
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# Load up virt_nodes. We only care about the virtual nodes that are members
# of links, but we have to read virt_lans to figure that out.
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#
printdb("Reading virt_nodes ...\n");

$query_result =
    DBQueryFatal("select distinct vname,vn.type,fixed, ".
		 " nt.isremotenode,nt.isvirtnode from virt_nodes as vn ".
		 "left join node_types as nt on ".
		 " nt.type=vn.type or nt.class=vn.type ".
		 "where pid='$pid' and eid='$eid'");

while (my ($vname,$type,$fixed,$isremote,$isvirt) =
       $query_result->fetchrow_array) {
    if (! defined($fixed)) {
	$fixed = 0;
    }

    #
    # if its a vtype, no entry in node_types. vtypes break virtual nodes.
    # Need to look inside the vtype and make sure no mixing of remote and
    # physnodes. Later ...
    #
    if (! defined($isremote)) {
	$isremote = 0;
    }
    if (! defined($isvirt)) {
	$isvirt = 0;
    }
    if ($fixed) {
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	my $node = Node->Lookup($fixed);
	if (! defined($node)) {
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	    fatal("Fixed node error ($vname): No such physnode $fixed!");
	}
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    }
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    newnode($vname, $type, $isvirt, $isremote, $fixed);
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}

#
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# XXX. At present, we cannot support specific types when using the wan
#      solver (note, all other nodes have already been allocated by
#      assign_wrapper, this includes remote nodes that not members of links).
#      The reason is that the wan solver knows nothing about types, all 
#      it cares about is the metrics. 
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#
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# The following code checks to make sure no specific types.
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#
foreach my $vnode (keys(%virtnodes)) {
    if (isremotenode($vnode)) {
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	my $type = virtnodetype($vnode);
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	# See above, type=class for classes!
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	if ($typemap{$type} ne $type) {
	    fatal("Cannot request specific types ($type) for widearea links!");
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	}
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    }
}

#
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# Load up the virt lans to find the link characteristics, and to determine
# the actual nodes we care about (those that are members of widearea links).
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#
printdb("Reading virt_lans ...\n");
$query_result =
    DBQueryFatal("select vname,member,delay,bandwidth,lossrate," .
		 "rdelay,rbandwidth,rlossrate " .
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		 "from virt_lans where pid='$pid' and eid='$eid' and ".
		 "     widearea=1");

if (! $query_result->numrows) {
    print "There are no remote links. This is okay!\n";
    exit(0);
}
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while (my ($vname,$member,
	   $delay,$bandwidth,$lossrate,
	   $rdelay,$rbandwidth,$rlossrate) = $query_result->fetchrow_array) {
    my ($node) = split(":",$member);

    if (!defined($virtlans{$vname})) {
	newvlan($vname);
    }
    my $virtlan = $virtlans{$vname};
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    $virtlan->{ISREMOTE} = 1;
    $virtlan->{COUNT}   += 1;
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    push(@{$virtlan->{MEMBERS}}, $member);
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    incvirtnodelinked($node);
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    #
    # Create a data structure for the parameters.
    # 
    $virtlan->{PARAMS}{$member} = {
	DELAY       => $delay,
	BW          => $bandwidth,
	PLR         => $lossrate,
	RDELAY      => $rdelay,
	RBW         => $rbandwidth,
	RPLR        => $rlossrate,
    };
}

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#
# Kill off any nodes that are not part of widearea links. They
# just get in the way below. Since local nodes can be connected to
# remote nodes in a link, the table might still include non remote
# nodes. 
#
foreach my $vnode (keys(%virtnodes)) {
    if (!virtnodelinked($vnode)) {
	delete($virtnodes{$vnode});
    }
}

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#
# Check the table, looking for remote nodes in lans.
#
foreach my $vname (keys(%virtlans)) {
    my $virtlan = $virtlans{$vname};
    my @members = @{$virtlan->{MEMBERS}};

    printdb("  $vname isremote:$virtlan->{ISREMOTE} @members\n");

    if ($virtlan->{ISREMOTE} && $virtlan->{COUNT} > 2) {
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	fatal("Lan $vname has a remote member. Not allowed!");
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    }

    # Just debugging.
    foreach my $member (@members) {
	my %params = %{$virtlan->{PARAMS}{$member}};

	printdb("    $member - ");
	foreach my $param (keys(%params)) {
	    printdb("$param:$params{$param} ");
	}
	printdb("\n");
    }

    #
    # Create a reverse mapping from the link members to the lans they
    # are part of. Indexed by names (without ports) since the wansolver
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    # only cares about nodes. This is how we map back a pair of vnodes
    # to the lans the nodes are members of.
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    #
    foreach my $member1 (@members) {
	my ($node1) = split(":",$member1);
	
	foreach my $member2 (@members) {
	    my ($node2) = split(":",$member2);

	    # No self referential links!
	    if ($node1 eq $node2) {
		next;
	    }

	    if (defined($rlanmap{"$node1:$node2"})) {
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		fatal("Cannot have multiple links bewteen widearea nodes ".
		      "$node1:$node2");
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	    }
	    $rlanmap{"$node1:$node2"} = $virtlan;
	}
    }
}

#
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# Run the solver
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#
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runwansolver();
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#
# Print out the mapping for the caller (assign_wrapper) in a more normalized
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# format. The caller is responsible for allocating the nodes. 
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#
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print STDOUT "Node Mapping:\n";

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foreach my $vnode (sort(keys(%virtnodes))) {
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    # Local nodes are always allocated in assign_wrapper. 
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    if (!isremotenode($vnode)) {
	next;
    }
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    my $mapping  = virtnodemapping($vnode);
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    print STDOUT "$vnode mapsto $mapping\n";
}
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# This print matters. Its how assign_wrapper knows it completed okay.
print STDOUT "Success!\n";
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exit $failed;

sub printdb {
    if ($debug) {
	print STDERR $_[0];
    }
};

#
# This big ball of goo runs the wan solver.
#
sub runwansolver() {
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    open(INPUT, ">wanlinkinfo.input") or
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	fatal("Could not open wanlinkinfo.input: $!");
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    #
    # Need the count of remotenodes, plus the boss node if there are
    # connections to the local testbed. We fix the mapping for the boss node.
    # Even worse, it requires knowing the name of the boss.
    #
    my $seenboss    = 0;
    my $remotecount = 0;
	
    foreach my $vnode (sort(keys(%virtnodes))) {
	if (isremotenode($vnode)) {
	    $remotecount++;
	}
	elsif (!$seenboss) {
	    $seenboss = $vnode;
	    $remotecount++;
	}
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    }

    #
    # Start the info program, and pipe in the results. The sad fact is that
    # we have to read the first section to get physical node names for tagging
    # the fixed nodes, but I'm not gonna worry about that right now since the
    # solver will just croak anyway. 
    #
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    if ($uselatestwadata) {
	$waninfoargs .= " -l";
    }
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    if (! $seenboss) {
	$waninfoargs .= " -r";
    }
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    if (defined($multiplex_factor)) {
	$waninfoargs .= " -c $multiplex_factor";
    }
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    open(INFO, "$waninfo $waninfoargs |") or
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	fatal("Could not start $waninfo: $!");
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    while (<INFO>) {
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	print INPUT $_;
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    }

    close(INFO) or
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	fatal("$waninfo: " . ($? ? "exited with status $?."
			         : "error closing pipe: $!"));
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    #
    # Now send it the second section.
    #
    # Number of v nodes first.
    #
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    print INPUT "$remotecount\n";
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    #
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    # Then a list of v nodes. 
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    #
    foreach my $vnode (sort(keys(%virtnodes))) {
	if (isremotenode($vnode)) {
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	    my $tag = $vnode;
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	    #
	    # Check for fixed mappings. 
	    #
	    if (isfixednode($vnode)) {
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		$tag = "$tag " . isfixednode($vnode);
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	    }
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	    print INPUT "$tag\n";
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	}
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	elsif ($vnode eq $seenboss) {
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	    print INPUT "$boss $boss\n";
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	}
    }

    #
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    # Now create the delay,bw,and plr matricies. We need to map all local
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    # nodes onto a single row/column. For that, we use the $seenboss value; all
    # local node names are mapped into that name in the matrix (2D hash).
    #
    my %latmatrix	= ();
    my %bwmatrix	= ();
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    my %plrmatrix     	= ();
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    foreach my $vnode1 (keys(%virtnodes)) {
	my $rowname = (!isremotenode($vnode1) ? $seenboss : $vnode1);
	
	foreach my $vnode2 (keys(%virtnodes)) {
	    my $virtlan = $rlanmap{"$vnode1:$vnode2"};
	    my $colname = (!isremotenode($vnode2) ? $seenboss : $vnode2);

	    if ($colname eq $rowname) {
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		$latmatrix{$rowname}{$colname}  = -1;
		$bwmatrix{$rowname}{$colname}   = -1;
		$plrmatrix{$rowname}{$colname}  = -1;
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		next;
	    }
	    if (!defined($virtlan)) {
		# Beware, multiple pairs map to the same spot. Ick.
		if (!defined($latmatrix{$rowname}{$colname})) {
		    $latmatrix{$rowname}{$colname} = -1;
		}
		if (!defined($bwmatrix{$rowname}{$colname})) {
		    $bwmatrix{$rowname}{$colname} = -1;
		}
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		if (!defined($plrmatrix{$rowname}{$colname})) {
		    $plrmatrix{$rowname}{$colname} = -1;
		}
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		next;
	    }
	    $latmatrix{$rowname}{$colname} =
		findlinkvalue($virtlan, "delay", $vnode1, $vnode2);
	    $bwmatrix{$rowname}{$colname} =
		findlinkvalue($virtlan, "bw", $vnode1, $vnode2);
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	    $plrmatrix{$rowname}{$colname} =
		findlinkvalue($virtlan, "plr", $vnode1, $vnode2);
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	}
    }

    #
    # Now print out the matricies.
    # 
    foreach my $vnode1 (sort(keys(%latmatrix))) {
	foreach my $vnode2 (sort(keys(%{ $latmatrix{$vnode1}}))) {
	    printdb("$vnode1:$vnode2($latmatrix{$vnode1}{$vnode2})  ");
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	    print INPUT "$latmatrix{$vnode1}{$vnode2}  ";
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	}
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	print INPUT "\n";
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	printdb("\n");
    }

    foreach my $vnode1 (sort(keys(%bwmatrix))) {
	foreach my $vnode2 (sort(keys(%{ $bwmatrix{$vnode1}}))) {
	    printdb("$vnode1:$vnode2($bwmatrix{$vnode1}{$vnode2})  ");
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	    print INPUT "$bwmatrix{$vnode1}{$vnode2}  ";
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	}
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	print INPUT "\n";
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	printdb("\n");
    }
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    foreach my $vnode1 (sort(keys(%plrmatrix))) {
	foreach my $vnode2 (sort(keys(%{ $plrmatrix{$vnode1}}))) {
	    printdb("$vnode1:$vnode2($plrmatrix{$vnode1}{$vnode2})  ");
	    print INPUT "$plrmatrix{$vnode1}{$vnode2}  ";
	}
	print INPUT "\n";
	printdb("\n");
    }
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    close(INPUT) or
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	fatal("Error closing input file: $!");
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    #
    # Need to start the wansolver. 
    # We use perl IPC goo to create a child we can both write to and read from
    # (normal perl I/O provides just unidirectional I/O to a process).
    # 
    if (! socketpair(CHILD, PARENT, AF_UNIX, SOCK_STREAM, PF_UNSPEC)) {
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	fatal("socketpair failed: $!");
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    }
    CHILD->autoflush(1);
    PARENT->autoflush(1);

    my $childpid = fork();
    if (! $childpid) {
	close CHILD;

	#
	# Dup our descriptors to the parent, and exec the program.
	# The parent then talks to it read/write.
	#
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	open(STDIN,  "<&PARENT") || fatal("Cannot redirect stdin");
	open(STDOUT, ">&PARENT") || fatal("Cannot redirect stdout");
	open(STDERR, ">&PARENT") || fatal("Cannot redirect stderr");
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	#
	# Start the solver. We will pipe in the stuff later.
	# Tee does not work here. 
	# 
        exec("cat wanlinkinfo.input | nice $wansolve $wansolveargs");
	#exec("cat /tmp/wansolved");
	die("*** $0:\n".
	    "    exec of $wansolve failed: $!\n");
    }
    close PARENT;
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    #
    # Wait for the child to give us some output. We want to be careful not to
    # let it run too long.
    #
    local $SIG{ALRM} = sub { kill("TERM", $childpid); };
    alarm 120;

    #
    # Read back the solution. 
    #
    while (<CHILD>) {
	printdb($_);

	if ($_ =~ /(\S+)\smapsTo\s(\S+)/) {
	    # XXX
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	    if ($1 eq $boss) {
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		next;
	    }
	    my ($pnode)  = split(":", $2);

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	    if ($pnode eq $boss) {
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		fatal("Oops, $1 was assigned to boss. That won't work!");
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	    }
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	    setvirtnodemapping($1, $pnode);
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	}
    }
    close(CHILD);

    waitpid($childpid, 0);
    alarm 0;
    if ($?) {
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	fatal((($? == 15) ? "$wansolve timed out looking for a solution."
	                  : "$wansolve failed with status: $?"));
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    }

    if ($failed) {
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	fatal("$wansolve failed to produce a valid result");
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    }
}

#
# Given a lan, and a pair of nodes, find the link entries and return
# the desired one-way parameter.
#
sub findlinkvalue($$$$)
{
    my ($virtlan, $param, $vnode1, $vnode2) = @_;
    my ($member1, $member2);

    foreach my $member (@{$virtlan->{MEMBERS}}) {
	my ($node) = split(":",$member);

	if ($node eq $vnode1) {
	    $member1 = $member;
	    next;
	}
	if ($node eq $vnode2) {
	    $member2 = $member;
	    next;
	}
    }
    if (!defined($member1) || ! defined($member2)) {
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	fatal("Could not find members for link $vnode1:$vnode2!");
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    }
    my %param1 = %{$virtlan->{PARAMS}{$member1}};
    my %param2 = %{$virtlan->{PARAMS}{$member2}};

    if ($param eq "bw") {
	return $param1{BW};
    }
    elsif ($param eq "delay") {
	return $param1{DELAY} + $param2{RDELAY};
    }
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    elsif ($param eq "plr") {
	return 1 - (1 - $param1{PLR}) * (1 - $param2{RPLR});
    }
701
    else {
702
	fatal("Bad param $param in findlinkvalue!");
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    }
}