GeniCM.pm.in 82.5 KB
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#!/usr/bin/perl -wT
#
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# GENIPUBLIC-COPYRIGHT
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# Copyright (c) 2008-2009 University of Utah and the Flux Group.
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# All rights reserved.
#
package GeniCM;

#
# The server side of the CM interface on remote sites. Also communicates
# with the GMC interface at Geni Central as a client.
#
use strict;
use Exporter;
use vars qw(@ISA @EXPORT);

@ISA    = "Exporter";
@EXPORT = qw ( );

# Must come after package declaration!
use lib '@prefix@/lib';
use GeniDB;
use Genixmlrpc;
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use GeniResponse;
use GeniTicket;
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use GeniCredential;
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use GeniCertificate;
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use GeniSlice;
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use GeniAggregate;
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use GeniAuthority;
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use GeniSliver;
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use GeniUser;
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use GeniRegistry;
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use GeniUtil;
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use GeniHRN;
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use libtestbed qw(SENDMAIL);
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use emutil;
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# Hate to import all this crap; need a utility library.
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use libdb qw(TBGetSiteVar);
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use User;
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use Node;
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use libadminctrl;
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use Interface;
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use English;
use Data::Dumper;
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use XML::Simple;
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use Date::Parse;
use POSIX qw(strftime);
use Time::Local;
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use Experiment;
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use Firewall;
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# Configure variables
my $TB		   = "@prefix@";
my $TBOPS          = "@TBOPSEMAIL@";
my $TBAPPROVAL     = "@TBAPPROVALEMAIL@";
my $TBAUDIT   	   = "@TBAUDITEMAIL@";
my $BOSSNODE       = "@BOSSNODE@";
my $OURDOMAIN      = "@OURDOMAIN@";
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my $PGENIDOMAIN    = "@PROTOGENI_DOMAIN@";
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my $CREATEEXPT     = "$TB/bin/batchexp";
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my $ENDEXPT        = "$TB/bin/endexp";
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my $NALLOC	   = "$TB/bin/nalloc";
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my $NFREE	   = "$TB/bin/nfree";
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my $AVAIL	   = "$TB/sbin/avail";
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my $PTOPGEN	   = "$TB/libexec/ptopgen";
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my $TBSWAP	   = "$TB/bin/tbswap";
my $SWAPEXP	   = "$TB/bin/swapexp";
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my $PLABSLICE	   = "$TB/sbin/plabslicewrapper";
my $NAMEDSETUP     = "$TB/sbin/named_setup";
my $VNODESETUP     = "$TB/sbin/vnode_setup";
my $GENTOPOFILE    = "$TB/libexec/gentopofile";
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my $EMULAB_PEMFILE = "@prefix@/etc/genicm.pem";
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#
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# Respond to a Resolve request. 
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#
sub Resolve($)
{
    my ($argref) = @_;
    my $uuid       = $argref->{'uuid'};
    my $cred       = $argref->{'credential'};
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    my $type       = lc( $argref->{'type'} );
    my $hrn        = $argref->{'hrn'};
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    if (! defined($cred)) {
	return GeniResponse->MalformedArgsResponse();
    }
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    if( defined( $hrn ) && GeniHRN::IsValid( $hrn ) ) {
	my ($auth,$t,$id) = GeniHRN::Parse( $hrn );

	return GeniResponse->Create( GENIRESPONSE_ERROR, undef,
				     "Authority mismatch" )
	    if( $auth ne $OURDOMAIN );

	$type = lc( $t );
	
	$hrn = $id;	
    }
    if (! (defined($type) && ($type =~ /^(node)$/))) {
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	return GeniResponse->MalformedArgsResponse();
    }
    # Allow lookup by uuid or hrn.
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    if (! defined($uuid) && !defined( $hrn ) ) {
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	return GeniResponse->MalformedArgsResponse();
    }
    if (defined($uuid) && !($uuid =~ /^[-\w]*$/)) {
	return GeniResponse->MalformedArgsResponse();
    }

    my $credential = GeniCredential->CreateFromSigned($cred);
    if (!defined($credential)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not create GeniCredential object");
    }
    
    #
    # Make sure the credential was issued to the caller, but no special
    # permission required to resolve component resources.
    #
    if ($credential->owner_uuid() ne $ENV{'GENIUUID'}) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "This is not your credential!");
    }
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    if ($type eq "node") {
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	my $node;
	
	if (defined($uuid)) {
	    $node= Node->Lookup($uuid);
	}
	else {
	    #
	    # We only want the last token for node lookup.
	    #
	    if ($hrn =~ /\./) {
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		($hrn) = ($hrn =~ /\.([-\w]*)$/);
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	    }
	    $node= Node->Lookup($hrn);
	}
	if (!defined($node)) {
	    return GeniResponse->Create(GENIRESPONSE_SEARCHFAILED,
					undef, "Nothing here by that name");
	}
	
	# Return a blob.
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	my $blob = { "hrn"          => "${PGENIDOMAIN}." . $node->node_id(),
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		     "uuid"         => $node->uuid(),
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		     "role"	    => $node->role(),
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		     "hostname"     => $node->node_id() . ".${OURDOMAIN}",
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		     "physctrl"     => 
			 Interface->LookupControl( $node->phys_nodeid() )->IP(),
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		     "urn"          => GeniHRN::Generate( $OURDOMAIN,
							  "node",
							  $node->node_id() )
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		   };

	#
	# Get the list of interfaces for the node.
	#
	my @interfaces;
	if ($node->AllInterfaces(\@interfaces) != 0) {
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					"Could not get interfaces for $uuid");
	}

	my @iblobs = ();
	foreach my $interface (@interfaces) {
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	    next
		if (!defined($interface->switch_id()));
		
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	    my $urn = GeniHRN::Generate( $OURDOMAIN, "interface",
					 $node->node_id() . ":" .
					 $interface->iface() );
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	    my $iblob = { "uuid"	=> $interface->uuid(),
			  "iface"	=> $interface->iface(),
			  "type"	=> $interface->type(),
			  "card"	=> $interface->card(),
			  "port"	=> $interface->port(),
			  "role"	=> $interface->role(),
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			  "IP"		=> $interface->IP() || "",
			  "mask"	=> $interface->mask() || "",
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			  "MAC"		=> $interface->mac(),
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			  "switch_id"   => "${OURDOMAIN}." . 
			      $interface->switch_id(),
			  "switch_card"	=> $interface->switch_card(),
			  "switch_port"	=> $interface->switch_port(),
			  "wire_type"	=> $interface->wire_type(),
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			  "urn"         => $urn
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		      };

	    push(@iblobs, $iblob);
	}
	$blob->{'interfaces'} = \@iblobs
	    if (@iblobs);
	
	return GeniResponse->Create(GENIRESPONSE_SUCCESS, $blob);
    }
    return GeniResponse->Create(GENIRESPONSE_UNSUPPORTED);
}

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#
# Discover resources on this component, returning a resource availablity spec
#
sub DiscoverResources($)
{
    my ($argref) = @_;
    my $credential = $argref->{'credential'};
    my $user_uuid  = $ENV{'GENIUSER'};

    $credential = GeniCredential->CreateFromSigned($credential);
    if (!defined($credential)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not create GeniCredential object");
    }
    # The credential owner/slice has to match what was provided.
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    if ($user_uuid ne $credential->owner_uuid()) {
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	return GeniResponse->Create(GENIRESPONSE_FORBIDDEN, undef,
				    "Invalid credentials for operation");
    }

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    #
    # A sitevar controls whether external users can get any nodes.
    #
    my $allow_externalusers = 0;
    if (!TBGetSiteVar('protogeni/allow_externalusers', \$allow_externalusers)){
	# Cannot get the value, say no.
	$allow_externalusers = 0;
    }
    if (!$allow_externalusers) {
	my $user = GeniUser->Lookup($user_uuid, 1);
	# No record means the user is remote.
	if (!defined($user) || !$user->IsLocal()) {
	    return GeniResponse->Create(GENIRESPONSE_UNAVAILABLE, undef,
					"External users temporarily denied");
	}
    }

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    #
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    # Use ptopgen in xml mode to spit back an xml file. 
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    #
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    if (! open(AVAIL, "$PTOPGEN -x -g -r -p GeniSlices |")) {
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	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not start avail");
    }
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    my $xml = "";
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    while (<AVAIL>) {
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	$xml .= $_;
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    }
    close(AVAIL);

    return GeniResponse->Create(GENIRESPONSE_SUCCESS, $xml);
}
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#
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# Update a ticket with a new rspec.
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#
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sub UpdateTicket($)
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{
    my ($argref) = @_;
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    return GetTicket($argref, 1);
}

#
# Respond to a GetTicket request. 
#
sub GetTicket($;$)
{
    my ($argref, $isupdate) = @_;
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    my $rspec      = $argref->{'rspec'};
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    my $impotent   = $argref->{'impotent'};
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    my $cred       = $argref->{'credential'};
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    my $tick       = $argref->{'ticket'};
    my $uuid       = $argref->{'uuid'};
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    my $vtopo      = $argref->{'virtual_topology'};
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    my $owner_uuid = $ENV{'GENIUSER'};
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    my $response   = undef;
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    my $didfwsetup = 0;
    my $ticket;

    # Default to no update
    $isupdate = 0
	if (!defined($isupdate));
    $impotent = 0
	if (!defined($impotent));
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    if (! defined($cred)) {
	return GeniResponse->MalformedArgsResponse();
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    }
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    if (defined($uuid)) {
	if (!($uuid =~ /^[-\w]*$/)) {
	    return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					"Improper ticket uuid: $uuid");
	}
	$ticket = GeniTicket->Lookup($uuid);
	if (!defined($ticket)) {
	    return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					"No such ticket here: $uuid");
	}
    }
    elsif (defined($rspec)) {
	if (! ($rspec =~ /^[\040-\176\012\015\011]+$/)) {
	    return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					"Improper rspec");
	}
	$rspec = XMLin($rspec, KeyAttr => [],
		       ForceArray => ["node", "link", "interface",
				      "interface_ref", "linkendpoints"]);
    }
    else {
	return GeniResponse->MalformedArgsResponse();
    }
    if ($isupdate) {
	$ticket = GeniTicket->CreateFromSignedTicket($tick);
	if (!defined($ticket)) {
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					"Could not create GeniTicket object");
	}
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    }
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    my $credential = GeniCredential->CreateFromSigned($cred);
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    if (!defined($credential)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not create GeniCredential object");
    }
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    my $slice_uuid = $credential->target_uuid();
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    my $user_uuid  = $credential->owner_uuid();
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    #
    # Make sure the credential was issued to the caller.
    #
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    if ($user_uuid ne $ENV{'GENIUUID'}) {
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	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
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				    "This is not your credential!");
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    }
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    defined($credential) &&
	($credential->HasPrivilege( "pi" ) or
	 $credential->HasPrivilege( "instantiate" ) or
	 $credential->HasPrivilege( "bind" ) or
	 return GeniResponse->Create( GENIRESPONSE_FORBIDDEN, undef,
				      "Insufficient privilege" ));
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    #
    # Deal with a duplicate ticket request, after verifying credential.
    #
    if (defined($uuid)) {
	#
	# Return the original ticket string, rather then creating and signing
	# a new version. Only the original requestor can get the ticket, which
	# can then be delegated if necessary. 
	#
	if ($user_uuid ne $ticket->owner_uuid()) {
	    return GeniResponse->Create(GENIRESPONSE_FORBIDDEN, undef,
					"Not your ticket!");
	}
	return GeniResponse->Create(GENIRESPONSE_SUCCESS, $ticket->asString());
    }
    
    #
    # We need this below to sign the ticket.
    #
    my $authority = GeniCertificate->LoadFromFile($EMULAB_PEMFILE);
    if (!defined($authority)) {
	print STDERR " Could not get uuid from $EMULAB_PEMFILE\n";
	return GeniResponse->Create(GENIRESPONSE_ERROR);
    }
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    #
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    # Create slice from the certificate.
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    #
    my $slice = GeniSlice->Lookup($slice_uuid);
    if (!defined($slice)) {
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	if ($isupdate) {
	    print STDERR "Could not locate slice $slice_uuid for Update\n";
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					"No slice found for UpdateTicket");
	}
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	$slice = CreateSliceFromCertificate($credential);
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	if (!defined($slice)) {
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	    print STDERR "Could not create $slice_uuid\n";
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	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
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					"Could not create slice");
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	}
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    }

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    #
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    # Ditto the user.
    #
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    my $user = GeniUser->Lookup($user_uuid, 1);
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    if (!defined($user)) {
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	if ($isupdate) {
	    print STDERR "Could not locate $user_uuid for UpdateTicket\n";
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					"No user found for UpdateTicket");
	}
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	$user = CreateUserFromCertificate($credential->owner_cert());
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	if (!defined($user)) {
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	    print STDERR "No user $user_uuid in the ClearingHouse\n";
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	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
			    "Could not get user info from ClearingHouse");
	}
    }

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    #
    # A sitevar controls whether external users can get any nodes.
    #
    my $allow_externalusers = 0;
    if (!TBGetSiteVar('protogeni/allow_externalusers', \$allow_externalusers)){
	# Cannot get the value, say no.
	$allow_externalusers = 0;
    }
    if (!$allow_externalusers && !$user->IsLocal()) {
	return GeniResponse->Create(GENIRESPONSE_UNAVAILABLE, undef,
				    "External users temporarily denied");
    }
    
    #
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    # For now all tickets expire very quickly (minutes), but once the
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    # ticket is redeemed, it will expire according to the rspec request.
    #
    if (exists($rspec->{'valid_until'})) {
	my $expires = $rspec->{'valid_until'};

	if (! ($expires =~ /^[-\w:.\/]+/)) {
	    return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					"Illegal valid_until in rspec");
	}
	# Convert to a localtime.
	my $when = timegm(strptime($expires));
	if (!defined($when)) {
	    return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					"Could not parse valid_until");
	}
	
	#
	# No more then 24 hours out ... Needs to be a sitevar?
	#
	my $diff = $when - time();
	if ($diff < (60 * 15) || $diff > (3600 * 24)) {
	    return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					"valid_until out of range");
	}
    }
    else {
	# Give it a reasonable default for later when the ticket is redeemed.
	$rspec->{'valid_until'} =
	    POSIX::strftime("20%y-%m-%dT%H:%M:%S", gmtime(time() + (3600*1)));
    }
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    #
    # Lock the ticket so it cannot be released.
    #
    if (defined($ticket) && $ticket->stored() && $ticket->Lock() != 0) {
	return GeniResponse->BusyResponse("ticket");
    }
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    #
    #
    # Lock the slice from further access.
    #
    if ($slice->Lock() != 0) {
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	$ticket->UnLock()
	    if (defined($ticket) && $ticket->stored());
	return GeniResponse->BusyResponse("slice");
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    }
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    # Shutdown slices get nothing.
    if ($slice->shutdown()) {
	$slice->UnLock();
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	$ticket->UnLock()
	    if (defined($ticket) && $ticket->stored());
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	return GeniResponse->Create(GENIRESPONSE_FORBIDDEN, undef,
				    "Slice has been shutdown");
    }
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    #
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    # For now, there can be only a single toplevel aggregate per slice.
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    # The existence of an aggregate means the slice is active here. 
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    #
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    if (!$isupdate) {
	my $aggregate = GeniAggregate->SliceAggregate($slice);
	if (defined($aggregate)) {
	    $response = GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
				     "Already have an aggregate for slice");
	    goto bad;
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	}
    }

    #
    # Firewall hack; just a flag in the rspec for now.
    #
    if (exists($rspec->{'needsfirewall'}) && $rspec->{'needsfirewall'}) {
	if ($slice->SetFirewallFlag($rspec->{'needsfirewall'}) != 0) {
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	    $response = GeniResponse->Create(GENIRESPONSE_ERROR);
	    goto bad;
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	}
    }
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    #
    # Until a ticket is redeemed, there is no experiment.
    #
    my $slice_experiment = $slice->GetExperiment();

    # This is where nodes are parked until a ticket is redeemed.
    my $reserved_holding = Experiment->Lookup("GeniSlices", "reservations");
    if (!defined($reserved_holding)) {
	#
	# This experiment has to exist!
	#
	print STDERR "Could not find Geni reservations experiment!\n";
	$response = GeniResponse->Create(GENIRESPONSE_ERROR);
	goto bad;
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    }

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    #
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    # An rspec is a structure that requests specific nodes. If those
    # nodes are available, then reserve it. Otherwise the ticket
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    # cannot be granted.
    #
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    my %namemap  = ();
    my %tofree   = ();
    my %colomap  = ();
    my %ifacemap = ();
    my @nodeids  = ();
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    my @dealloc;
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    #
    # If this is a ticket update, we want to seed the namemap with
    # existing nodes. This is cause the rspec might refer to wildcards
    # that were already bound in a previous call. We also want to know
    # what nodes are currently reserved in case we have to release some.
    #
    if ($isupdate) {
	foreach my $ref (@{$ticket->rspec()->{'node'}}) {
	    my $resource_uuid = $ref->{'component_uuid'} || $ref->{'uuid'};
	    my $manager_uuid  = $ref->{'component_manager_uuid'};
	    my $node_nickname = $ref->{'virtual_id'} || $ref->{'nickname'};
	    my $colocate      = $ref->{'colocate'} || $ref->{'phys_nickname'};

	    # Let remote nodes pass through.
	    next
		if (defined($manager_uuid) && $manager_uuid ne $ENV{'MYUUID'});

	    my $node = Node->Lookup($resource_uuid);
	    if (!defined($node)) {
		$response = GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
						 "Bad resource $resource_uuid in ticket");
		goto bad;
	    }

	    # Grab the reservation. We will want to release unused nodes,
	    # but only if not already assigned to the slice.
	    my $reservation = $node->Reservation();
	    if (defined($reservation)) {
		$tofree{$resource_uuid} = $node
		    if ($reservation->SameExperiment($reserved_holding));
	    }
	    $namemap{$node_nickname} = $node;
	    $colomap{$colocate} = $node
		if (defined($colocate));
	}
    }
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    foreach my $ref (@{$rspec->{'node'}}) {
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	my $resource_uuid = $ref->{'component_uuid'} || $ref->{'uuid'};
	my $manager_uuid  = $ref->{'component_manager_uuid'};
	my $node_nickname = $ref->{'virtual_id'} || $ref->{'nickname'};
	my $colocate      = $ref->{'colocate'} || $ref->{'phys_nickname'};
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	my $virtualization_type = $ref->{'virtualization_type'};
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	my $node;

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	# Let remote nodes pass through.
	next
	    if (defined($manager_uuid) && $manager_uuid ne $ENV{'MYUUID'});

	if (!defined($node_nickname)) {
	    $response = GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
				     "Must provide a virtual_id for nodes");
	    goto bad;
	}

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	#
	# Mostly for debugging right now, allow a wildcard.
	#
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	if (!defined($resource_uuid) || $resource_uuid eq "*") {
	    if (defined($colocate) && exists($colomap{$colocate})) {
		$node = $colomap{$colocate};
	    }
	    elsif ($isupdate && exists($namemap{$node_nickname})) {
		$node = $namemap{$node_nickname};
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	    }
	    else {
		$node = FindFreeNode($virtualization_type, @nodeids);
	    }
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	    if (!defined($node)) {
		$response = GeniResponse->Create(GENIRESPONSE_UNAVAILABLE,
						 undef,
						 "No free nodes for wildcard");
		goto bad;
	    }
	    $resource_uuid = $node->uuid();
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	    $ref->{'component_uuid'} = $node->uuid();
	    $ref->{'component_manager_uuid'} = $ENV{'MYUUID'};
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	}
	else {
	    $node = Node->Lookup($resource_uuid);

	    if (!defined($node)) {
		$response =
		    GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					 "Bad resource $resource_uuid");
		goto bad;
	    }
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	}
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	#
	# Look for interface forward declarations that will be used later
	# in the link specifications. 
	#
	foreach my $linkref (@{$ref->{'interface'}}) {
	    my $component_id = $linkref->{"component_id"};
	    my $virtual_id   = $linkref->{"virtual_id"};

	    if (!defined($virtual_id)) {
		$response = GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
			     "Must provide a virtual_id for interfaces");
		goto bad;
	    }
	    
	    $ifacemap{$node_nickname} = {}
	        if (!exists($ifacemap{$node_nickname}));

	    # Store reference so we can munge it below. 
	    $ifacemap{$node_nickname}->{$virtual_id} = $linkref;
	}
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	#
	# Widearea nodes do not need to be allocated, but for now all
	# I allow is a plabdslice node.
	#
	if ($node->isremotenode()) {
	    if (! $node->isplabphysnode()) {
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		$response =
		    GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					 "Only plab widearea nodes");
		goto bad;
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	    }
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	    goto skipalloc;
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	}
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	#
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	# See if the node is already reserved. 
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	#
	my $reservation = $node->Reservation();
	if (defined($reservation)) {
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	    # Reserved during previous ticket operation, or already
	    # assigned to the slice (ticket redeemed).
	    goto skipalloc
		if ($reservation->SameExperiment($reserved_holding) ||
		    (defined($slice_experiment) &&
		     $reservation->SameExperiment($slice_experiment)));
	    
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	    $response =
		GeniResponse->Create(GENIRESPONSE_UNAVAILABLE, undef,
				     "$resource_uuid ($node) not available");
	    goto bad;
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	}
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	# watch for duplicates, as for multiple vnodes on a pnode.
	push(@nodeids, $node->node_id())
	    if (! grep {$_ eq $node->node_id()} @nodeids);

      skipalloc:
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	$namemap{$node_nickname} = $node
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	    if (defined($node_nickname));
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	$colomap{$colocate} = $node
	    if (defined($colocate));
	delete($tofree{$node->uuid()})
	    if ($isupdate && exists($tofree{$node->uuid()}));
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    }
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    #
    # A sitevar controls how many total nodes external users can allocate.
    #
    # XXX All this policy stuff is a whack job for the initial release. 
    #
    my $max_externalnodes = 0;
    if (!TBGetSiteVar('protogeni/max_externalnodes', \$max_externalnodes)){
	# Cannot get the value, say none.
	$max_externalnodes = 0;
    }
    if (scalar(@nodeids) > $max_externalnodes) {
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	$response = GeniResponse->Create(GENIRESPONSE_UNAVAILABLE, undef,
					 "Too many nodes; limited to $max_externalnodes");
	goto bad;
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    }
    # Check current usage by dipping into the libadminctrl library.
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    my $curusage = libadminctrl::LoadCurrent($reserved_holding->creator(),
					     $reserved_holding->pid(),
					     $reserved_holding->gid());
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    if (!defined($curusage)) {
	print STDERR "Could not get current usage from adminctl library\n";
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	$response = GeniResponse->Create(GENIRESPONSE_UNAVAILABLE, undef,
					 "Temporarily unavailable");
	goto bad;
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    }
    if ($curusage->{"nodes"}->{'project'} + scalar(@nodeids) >=
	$max_externalnodes) {
	my $nodesleft = $max_externalnodes - $curusage->{"nodes"}->{'project'};
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	$response = GeniResponse->Create(GENIRESPONSE_UNAVAILABLE, undef,
					 "Too many nodes; limited to $nodesleft");
	goto bad;
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    }

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    # Nalloc might fail if the node gets picked up by someone else.
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    if (@nodeids && !$impotent) {
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	system("$NALLOC GeniSlices reservations @nodeids");
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	if (($? >> 8) < 0) {
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	    $response =
		GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				     "Allocation failure");
	    goto bad;
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	}
	elsif (($? >> 8) > 0) {
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	    $response =
		GeniResponse->Create(GENIRESPONSE_UNAVAILABLE, undef,
				     "Could not allocate node");
	    goto bad;
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	}
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	# In case the code below fails, before ticket is created.
	@dealloc = @nodeids;
    }
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    goto skiplinks
	if (!exists($rspec->{'link'}));
    
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    #
    # Now deal with links for wildcarded nodes. We need to fill in the
    # node_uuid.
    #
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    foreach my $linkref (@{$rspec->{'link'}}) {
	my $nickname   = $linkref->{"nickname"} || $linkref->{"virtual_id"};
	my $interfaces = $linkref->{'linkendpoints'} ||
	    $linkref->{'interface_ref'};
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	if (!defined($nickname)) {
	    $response = GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
				     "Must provide a virtual_id for links");
	    goto bad;
	}
	
	foreach my $ref (@{ $interfaces }) {
	    my $node_nickname = $ref->{'virtual_node_id'} ||
		$ref->{'node_nickname'};
	    my $iface_id     = $ref->{'virtual_interface_id'} ||
		$ref->{'iface_name'};
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	    my $istunnel      = (exists($linkref->{'link_type'}) &&
				 $linkref->{'link_type'} eq "tunnel");
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	    if (!defined($node_nickname)) {
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		$response =
		    GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				 "$nickname: Need node id for links");
		goto bad;
	    }
	    if (!defined($iface_id)) {
		$response =
		    GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				 "$nickname: Need interface id for links");
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		goto bad;
	    }

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	    if ($istunnel) {
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		# Might be the other side. Skip for now; might bite later.
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		next
		    if (!exists($namemap{$node_nickname}));
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		# Not doing anything else.
		next;
	    }
	    if (!exists($namemap{$node_nickname})) {
		$response =
		    GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				 "$nickname: No such virtual_node_id: ".
				 "$node_nickname:$iface_id");
		goto bad;
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	    }
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	    #
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	    # Sanity check the interface.
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	    #
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	    if (!exists($ifacemap{$node_nickname}->{$iface_id})) {
		$response =
		    GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				 "$nickname: No such interface on component: ".
				 "$node_nickname:$iface_id");
		goto bad;
	    }
	    my $node = $namemap{$node_nickname};
	    my $iface_ref  = $ifacemap{$node_nickname}->{$iface_id};
	    my $iface_name = $iface_ref->{"component_id"};

	    # Grab all the interfaces.
	    my @interfaces;
	    if ($node->AllInterfaces(\@interfaces) != 0) {
		$response = GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				 "Could not get interfaces for $node");
		goto bad;
	    }
	    # Make sure its valid, or fill in a wildcard.
	    foreach my $interface (@interfaces) {
		next
		    if (!defined($interface->switch_id()));
		next
		    if ($interface->role() ne "expt");
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		if (defined($iface_name) && $iface_name ne "*") {

		}
		else {
		    $iface_name = $interface->iface();
		    $iface_ref->{"component_id"} = $iface_name;
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		    last;
		}
	    }
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	    if (!defined($iface_name)) {
		$response = GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				 "$nickname: Could not assign wildcard: ".
				 "$node_nickname:$iface_id");
		goto bad;
	    }
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	}
    }
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  skiplinks:
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    #
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    # Create a new ticket.
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    #
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    my $newticket = GeniTicket->Create($authority, $user, $rspec);
    if (!defined($newticket)) {
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	$response =
	    GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				 "Could not create GeniTicket object");
	goto bad;
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    }
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    if ($newticket->Sign() || $newticket->Store()) {
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	$response = GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					 "Could not sign Ticket");
	goto bad;
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    }
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    if ($isupdate) {
	#
	# Delete (not release) the old ticket. 
	#
	$ticket->Delete(TICKET_RELEASED)
	    if ($ticket->stored());

	# And release any nodes we no longer wanted.
	if (keys(%tofree)) {
	    my @ids = map { $_->node_id() } values(%tofree);

	    system("export NORELOAD=1; ".
		   "$NFREE -x -q GeniSlices reservations @ids");
	}
    }
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    $slice->UnLock();
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    return GeniResponse->Create(GENIRESPONSE_SUCCESS, $newticket->asString());
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  bad:
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    #
    # Have to be careful in a ticket update, to not release nodes that
    # might be referenced in the old ticket. 
    #
    if ($isupdate) {
	if (defined($newticket)) {
	    # Delete, not Release (which frees nodes).
	    $newticket->Delete(TICKET_PURGED);
	}
	if (@dealloc) {
	    system("export NORELOAD=1; ".
		   "$NFREE -x -q GeniSlices reservations @dealloc");
	}
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    }
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    else {
	# Release will free the nodes.
	if (defined($newticket)) {
	    $newticket->Release(TICKET_PURGED);
	}
	elsif (@dealloc) {
	    system("export NORELOAD=1; ".
		   "$NFREE -x -q GeniSlices reservations @dealloc");
	}
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    }
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  unlock:
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    $slice->UnLock()
	if (defined($slice));
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    $ticket->UnLock()
	if (defined($ticket) && $ticket->stored());
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    return $response;
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}

#
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# Redeem a ticket
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#
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sub RedeemTicket($)
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{
    my ($argref) = @_;
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    return SliverWork($argref, 0);
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}
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#
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# Update a sliver
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#
sub UpdateSliver($)
{
    my ($argref) = @_;
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    return SliverWork($argref, 1);
}

#
# Utility function for above routines.
#
sub SliverWork($$)
{
    my ($argref, $isupdate) = @_;
    my $credstr    = $argref->{'credential'};
    my $ticketstr  = $argref->{'ticket'};
    my $impotent   = $argref->{'impotent'};
    my $keys       = $argref->{'keys'};
    my $extraargs  = $argref->{'extraargs'};
    my $didfwsetup = 0;
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    $impotent = 0
	if (!defined($impotent));

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    if (! (defined($credstr) && defined($ticketstr))) {
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	return GeniResponse->Create(GENIRESPONSE_BADARGS);
    }
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    my $credential = GeniCredential->CreateFromSigned($credstr);
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    if (!defined($credential)) {
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	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
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				    "Could not create GeniCredential object");
    }
    #
    # Make sure the credential was issued to the caller.
    #
    if ($credential->owner_uuid() ne $ENV{'GENIUUID'}) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "This is not your credential!");
    }
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    $credential->HasPrivilege( "pi" ) or
	$credential->HasPrivilege( "instantiate" ) or
	$credential->HasPrivilege( "control" ) or
	return GeniResponse->Create( GENIRESPONSE_FORBIDDEN, undef,
				     "Insufficient privilege" );

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    my $owner_uuid = $credential->owner_uuid();
    my $owner_cert = $credential->owner_cert();
    my $message    = "Error creating sliver/aggregate";

    my $ticket = GeniTicket->CreateFromSignedTicket($ticketstr);
    if (!defined($ticket)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not create GeniTicket object");
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    }
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    # Only unredeemed tickets are stored in the DB.
    if (!$ticket->stored()) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "This ticket was already redeemed!");
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    }
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    # Make sure the ticket was issued to the caller.
    if ($ticket->owner_uuid() ne $ENV{'GENIUUID'}) {
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	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
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				    "This is not your ticket!");
    }
    # Make sure the ticket target is this Manager
    if ($ticket->target_uuid() ne $ENV{'MYUUID'}) {
	return GeniResponse->Create(GENIRESPONSE_FORBIDDEN, undef,
				    "This ticket is for another authority!");
    }

    #
    # For now, there can be only a single toplevel aggregate per slice.
    #
    my $aggregate;
    my $slice;
    my $slice_uuid;
    
    if ($isupdate) {
	$aggregate = GeniAggregate->Lookup($credential->target_uuid());

	if (!defined($aggregate)) {
	    return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					"Sliver cannot be found");
	}
	$slice_uuid = $aggregate->slice_uuid();
	$slice = GeniSlice->Lookup($slice_uuid);
	if (!defined($slice)) {
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					"No slice record for $slice_uuid");
	}
    }
    else {
	$slice_uuid = $credential->target_uuid();
	$slice = GeniSlice->Lookup($slice_uuid);
	if (!defined($slice)) {
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					"No slice record for $slice_uuid");
	}
	$aggregate  = GeniAggregate->SliceAggregate($slice);

	if (defined($aggregate)) {
	    return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					"Already have an aggregate for slice");
	}
    }
    if ($ticket->Lock() != 0) {
	return GeniResponse->BusyResponse("ticket");
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    }
    if ($slice->Lock() != 0) {
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	$ticket->UnLock();
	return GeniResponse->BusyResponse("slice");
    }

    # Do not redeem an expired ticket.
    if ($ticket->Expired()) {
	$slice->UnLock();
	$ticket->UnLock();
	return GeniResponse->Create(GENIRESPONSE_EXPIRED, undef,
				    "Ticket has expired");
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    }
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    # Shutdown slices get nothing.
    if ($slice->shutdown()) {
	$slice->UnLock();
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	$ticket->UnLock();
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	return GeniResponse->Create(GENIRESPONSE_FORBIDDEN, undef,
				    "Slice has been shutdown");
    }
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    #
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    # Create the user.
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    #
    my $owner = GeniUser->Lookup($owner_uuid);
    if (!defined($owner)) {
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	$owner = CreateUserFromCertificate($owner_cert);
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	if (!defined($owner)) {
	    print STDERR "No user $owner_uuid in the ClearingHouse\n";
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					"No user record for $owner_uuid");
	}
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    }
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    if (!$owner->IsLocal() && defined($keys)) {
	$owner->Modify(undef, undef, $keys);
    }
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    my $experiment = GeniExperiment($slice);
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    if (!defined($experiment)) {
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	$slice->UnLock();
	$ticket->UnLock();
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	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "No local experiment for slice");
    }

    #
    # Figure out what nodes to allocate or free. 
    #
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    my %physnodes= ();
    my %nodemap  = ();
    my %linkmap  = ();
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    my %toalloc  = ();
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    my %colomap  = ();
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    my @allocated= ();
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    my @tofree   = ();
    my $pid      = $experiment->pid();
    my $eid      = $experiment->eid();
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    my $rspec    = $ticket->rspec();
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    my $needplabslice = 0;
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    #
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    # Find current slivers and save.
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    #
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    if (defined($aggregate)) {
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	my @slivers;
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	if ($aggregate->SliverList(\@slivers) != 0) {
	    $message = "Could not get sliverlist for $aggregate";
	    goto bad;
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	}
	foreach my $s (@slivers) {
	    if (ref($s) eq "GeniSliver::Node") {
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		$nodemap{$s->nickname()} = $s;
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	    }
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	    elsif (ref($s) eq "GeniAggregate::Link" ||
		   ref($s) eq "GeniAggregate::Tunnel") {
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		# XXX See the constructor in GeniAggregate.
		my ($linkname) = ($s->hrn() =~ /\.([-\w]*)$/);
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		$linkmap{$linkname} = $s;
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	    }
	    else {
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		$message = "Only nodes or links allowed";
		goto bad;
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	    }
	}
    }

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    #
    # Figure out new expiration time; this is the time at which we can
    # idleswap the slice out. 
    #
    if (exists($rspec->{'valid_until'})) {
	my $expires = $rspec->{'valid_until'};

	if (! ($expires =~ /^[-\w:.\/]+/)) {
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	    $message = "Illegal valid_until in rspec";
	    goto bad;
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	}
	# Convert to a localtime.
	my $when = timegm(strptime($expires));
	if (!defined($when)) {
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	    $message = "Could not parse valid_until";
	    goto bad;
					
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	}
	#
	# No more then 24 hours out ... Needs to be a sitevar?
	#
	my $diff = $when - time();
	if ($diff < (60 * 15) || $diff > (3600 * 24)) {
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	    $message = "valid_until out of range";
	    goto bad;
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	}
	if ($slice->SetExpiration($when) != 0) {
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	    $message = "Could not set expiration time";
	    goto bad;
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	}
    }

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    # Nodes are in this holding experiment.
    my $reserved_holding = Experiment->Lookup("GeniSlices", "reservations");
    if (!defined($reserved_holding)) {
	#
	# This experiment has to exist!
	#
	print STDERR "Could not find Geni reservations experiment!\n";
	goto bad;
    }

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    #
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    # Make sure all nodes requested are allocated.