libdb.pm.in 61.8 KB
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#!/usr/bin/perl -w

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#
# EMULAB-COPYRIGHT
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# Copyright (c) 2000-2003 University of Utah and the Flux Group.
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# All rights reserved.
#

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#
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# A library of useful DB stuff. Mostly things that get done a lot.
# Saves typing.
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#
# XXX: The notion of "uid" is a tad confused. A unix uid is a number,
#      while in the DB a user uid is a string (equiv to unix login).
#      Needs to be cleaned up.
#
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package libdb;
use Exporter;
@ISA = "Exporter";
@EXPORT =
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    qw ( NODERELOADING_PID NODERELOADING_EID NODEDEAD_PID NODEDEAD_EID
	 NODEBOOTSTATUS_OKAY NODEBOOTSTATUS_FAILED NODEBOOTSTATUS_UNKNOWN
	 NODESTARTSTATUS_NOSTATUS PROJMEMBERTRUST_NONE PROJMEMBERTRUST_USER
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	 PROJMEMBERTRUST_ROOT PROJMEMBERTRUST_GROUPROOT
	 PROJMEMBERTRUST_PROJROOT

	 TBTrustConvert TBMinTrust TBGrpTrust TBProjTrust

	 TB_NODEACCESS_READINFO TB_NODEACCESS_MODIFYINFO
	 TB_NODEACCESS_LOADIMAGE TB_NODEACCESS_REBOOT
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	 TB_NODEACCESS_POWERCYCLE TB_NODEACCESS_MODIFYVLANS
	 TB_NODEACCESS_MIN TB_NODEACCESS_MAX
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	 TB_USERINFO_READINFO TB_USERINFO_MODIFYINFO
	 TB_USERINFO_MIN TB_USERINFO_MAX

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	 USERSTATUS_ACTIVE USERSTATUS_FROZEN
	 USERSTATUS_UNAPPROVED USERSTATUS_UNVERIFIED USERSTATUS_NEWUSER
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	 TB_EXPT_READINFO TB_EXPT_MODIFY TB_EXPT_DESTROY
	 TB_EXPT_MIN TB_EXPT_MAX

	 TB_PROJECT_READINFO TB_PROJECT_MAKEGROUP
	 TB_PROJECT_EDITGROUP TB_PROJECT_DELGROUP
	 TB_PROJECT_LEADGROUP TB_PROJECT_ADDUSER
	 TB_PROJECT_DELUSER TB_PROJECT_MAKEOSID
	 TB_PROJECT_DELOSID TB_PROJECT_MAKEIMAGEID TB_PROJECT_DELIMAGEID
	 TB_PROJECT_CREATEEXPT TB_PROJECT_MIN TB_PROJECT_MAX

	 TB_OSID_READINFO TB_OSID_CREATE
	 TB_OSID_DESTROY TB_OSID_MIN TB_OSID_MAX

	 TB_IMAGEID_READINFO TB_IMAGEID_MODIFYINFO
	 TB_IMAGEID_CREATE TB_IMAGEID_DESTROY
	 TB_IMAGEID_ACCESS TB_IMAGEID_MIN TB_IMAGEID_MAX
	 
	 DBLIMIT_NSFILESIZE NODERELOADPENDING_EID
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	 EXPTSTATE_NEW EXPTSTATE_PRERUN EXPTSTATE_SWAPPED EXPTSTATE_SWAPPING
	 EXPTSTATE_ACTIVATING EXPTSTATE_ACTIVE EXPTSTATE_TESTING
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	 EXPTSTATE_TERMINATING EXPTSTATE_TERMINATED EXPTSTATE_UPDATING
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	 BATCHSTATE_POSTED BATCHSTATE_RUNNING BATCHSTATE_TERMINATING
	 BATCHSTATE_ACTIVATING
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	 TBBatchState TBSetBatchState

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	 TB_NODELOGTYPE_MISC TB_NODELOGTYPES TB_DEFAULT_NODELOGTYPE 

	 TB_DEFAULT_RELOADTYPE TB_RELOADTYPE_FRISBEE TB_RELOADTYPE_NETDISK
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	 TB_EXPTPRIORITY_LOW TB_EXPTPRIORITY_HIGH

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	 TB_ASSIGN_TOOFEWNODES TB_OPSPID
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	 TBDB_TBEVENT_NODESTATE TBDB_TBEVENT_NODEOPMODE TBDB_TBEVENT_CONTROL
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	 TBDB_NODESTATE_ISUP TBDB_NODESTATE_REBOOTING TBDB_NODESTATE_REBOOTED
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	 TBDB_NODESTATE_SHUTDOWN TBDB_NODESTATE_BOOTING TBDB_NODESTATE_TBSETUP
	 TBDB_NODESTATE_RELOADSETUP TBDB_NODESTATE_RELOADING 
	 TBDB_NODESTATE_RELOADDONE TBDB_NODESTATE_UNKNOWN
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	 TBDB_NODEOPMODE_NORMAL TBDB_NODEOPMODE_DELAYING
	 TBDB_NODEOPMODE_UNKNOWNOS TBDB_NODEOPMODE_RELOADING
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	 TBDB_NODEOPMODE_NORMALv1 TBDB_NODEOPMODE_MINIMAL 
	 TBDB_NODEOPMODE_RELOAD TBDB_NODEOPMODE_DELAY
	 TBDB_NODEOPMODE_BOOTWHAT
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	 TBDB_NODEOPMODE_UNKNOWN
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	 TBDB_EXPT_WORKDIR
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	 TBSetNodeEventState TBGetNodeEventState
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	 TBSetNodeOpMode TBGetNodeOpMode
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	 TB_OSID_MBKERNEL TB_OSID_PXEBOOT TB_OSID_FRISBEE 
	 TBBootWhat TBNodeStateTimeout
	 TBDB_TBCONTROL_RESET TBDB_TBCONTROL_RELOADDONE 
	 TBDB_TBCONTROL_TIMEOUT TBDB_NO_STATE_TIMEOUT
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	 TBDB_LOWVPORT TBDB_MAXVPORT TBDB_PORTRANGE

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	 TBAdmin TBProjAccessCheck TBNodeAccessCheck TBOSIDAccessCheck
	 TBImageIDAccessCheck TBExptAccessCheck ExpLeader MarkNodeDown
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	 SetNodeBootStatus OSFeatureSupported IsShelved NodeidToExp
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	 UserDBInfo DBQuery DBQueryFatal DBQueryWarn DBWarn DBFatal
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	 DBQuoteSpecial UNIX2DBUID ExpState SetExpState ProjLeader
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	 ExpNodes DBDateTime DefaultImageID GroupLeader TBGroupUnixInfo
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	 TBValidNodeLogType TBValidNodeName TBSetNodeLogEntry
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	 TBSetSchedReload MapNodeOSID TBLockExp TBUnLockExp TBSetExpSwapTime
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	 TBUnixGroupList TBOSID TBImageID TBdbfork VnameToNodeid TBExpLocked
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	 TBIsNodeRemote TBExptSetLogFile TBExptClearLogFile TBExptGetLogFile
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	 TBIsNodeVirtual TBControlNetIP TBPhysNodeID
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	 TBExptOpenLogFile TBExptCloseLogFile TBExptCreateLogFile
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	 TBNodeUpdateAccountsByPid TBNodeUpdateAccountsByType
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	 TBNodeUpdateAccountsByUID
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	 TBSaveExpLogFiles TBExptWorkDir TBExptUserDir TBExptLogDir
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	 TBExptDestroy TBIPtoNodeID TBNodeBootReset TBNodeStateWait
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	 TBDB_WIDEAREA_LOCALNODE
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	 TBWideareaNodeID TBTipServers
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	 );
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# Must come after package declaration!
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use lib '@prefix@/lib';
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use English;
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use File::Basename;
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use POSIX qw(strftime);
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require Mysql;

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# Configure variables
my $TB		= "@prefix@";
my $DBNAME	= "@TBDBNAME@";
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my $TBOPS       = "@TBOPSEMAIL@";
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my $EVENTSYS    = "@EVENTSYS@";
my $BOSSNODE    = "@BOSSNODE@";
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my $TBOPSPID	= "emulab-ops";
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my $SCRIPTNAME = "Unknown";
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if ($EVENTSYS) {
    require event;
    import event;
}

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# Untainted scriptname for email below.
if ($PROGRAM_NAME =~ /^([-\w\.\/]+)$/) {
    $SCRIPTNAME = basename($1);
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}
else {
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    $SCRIPTNAME = "Tainted";
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}

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#
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# Set up for querying the database. Note that fork causes a reconnect
# to the DB in the child. 
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#
my $DB;
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$DBQUERY_MAXTRIES = 1;
$DBCONN_MAXTRIES  = 5;
@EXPORT_OK        = qw($DBQUERY_MAXTRIES $DBCONN_MAXTRIES);
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sub TBDBConnect()
{
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    my $maxtries = $DBCONN_MAXTRIES;
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    #
    # Construct a 'username' from the name of this script and the user who
    # ran it. This is for accounting purposes.
    #
    my $name = getpwuid($UID);
    if (!$name) {
	$name = "uid$UID";
    }
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    my $dbuser = "$SCRIPTNAME:$name";
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    while ($maxtries) {
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	$DB = Mysql->connect("localhost", $DBNAME, $dbuser, "none");
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	if (defined($DB)) {
	    last;
	}
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	$maxtries--;
	sleep(1);
    }
    if (!defined($DB)) {
	die("Cannot connect to DB after several attempts!\n");
    }
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    $DB->{'dbh'}->{'PrintError'} = 0;
    $Mysql::QUIET = 1;
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}
TBDBConnect();
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sub TBdbfork()
{
    undef($DB);
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    TBDBConnect();
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}

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#
# Record last DB error string.
#
my $DBErrorString = "";

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#
# Needs to be config'ed.
#
sub TBDB_EXPT_WORKDIR()		{ "/usr/testbed/expwork"; }
    
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#
# Define exported "constants". Basically, these are just perl subroutines
# that look like constants cause you do not need to call a perl subroutine
# with parens. That is, FOO and FOO() are the same thing.
#
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sub NODERELOADING_PID()		{ "emulab-ops"; }
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sub NODERELOADING_EID()		{ "reloading"; }
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sub NODERELOADPENDING_EID()	{ "reloadpending"; }
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sub NODEDEAD_PID()		{ "emulab-ops"; }
sub NODEDEAD_EID()		{ "hwdown"; }

sub NODEBOOTSTATUS_OKAY()	{ "okay" ; }
sub NODEBOOTSTATUS_FAILED()	{ "failed"; }
sub NODEBOOTSTATUS_UNKNOWN()	{ "unknown"; }
sub NODESTARTSTATUS_NOSTATUS()	{ "none"; }

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sub EXPTSTATE_NEW()		{ "new"; }
sub EXPTSTATE_PRERUN()		{ "prerunning"; }
sub EXPTSTATE_SWAPPED()		{ "swapped"; }
sub EXPTSTATE_SWAPPING()	{ "swapping"; }
sub EXPTSTATE_ACTIVATING()	{ "activating"; }
sub EXPTSTATE_ACTIVE()		{ "active"; }
sub EXPTSTATE_TESTING()		{ "testing"; }
sub EXPTSTATE_TERMINATING()	{ "terminating"; }
sub EXPTSTATE_TERMINATED()	{ "ended"; }
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sub EXPTSTATE_UPDATING()	{ "updating"; }
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sub BATCHSTATE_POSTED()		{ "posted"; }
sub BATCHSTATE_ACTIVATING()	{ "activating"; }
sub BATCHSTATE_RUNNING()	{ "active"; }
sub BATCHSTATE_TERMINATING()	{ "terminating"; }

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sub USERSTATUS_ACTIVE()		{ "active"; }
sub USERSTATUS_FROZEN()		{ "frozen"; }
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sub USERSTATUS_UNAPPROVED()	{ "unapproved"; }
sub USERSTATUS_UNVERIFIED()	{ "unverified"; }
sub USERSTATUS_NEWUSER()	{ "newuser"; }
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#
# We want valid project membership to be non-zero for easy membership
# testing. Specific trust levels are encoded thusly.
# 
sub PROJMEMBERTRUST_NONE()	{ 0; }
sub PROJMEMBERTRUST_USER()	{ 1; }
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sub PROJMEMBERTRUST_ROOT()	{ 2; }
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sub PROJMEMBERTRUST_LOCALROOT()	{ 2; }
sub PROJMEMBERTRUST_GROUPROOT()	{ 3; }
sub PROJMEMBERTRUST_PROJROOT()	{ 4; }
sub PROJMEMBERTRUST_ADMIN()	{ 5; }

#
# Access types. Duplicated in the web interface. Make changes there too!
# 
# Things you can do to a node.
sub TB_NODEACCESS_READINFO()	{ 1; }
sub TB_NODEACCESS_MODIFYINFO()	{ 2; }
sub TB_NODEACCESS_LOADIMAGE()	{ 3; }
sub TB_NODEACCESS_REBOOT()	{ 4; }
sub TB_NODEACCESS_POWERCYCLE()	{ 5; }
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sub TB_NODEACCESS_MODIFYVLANS()	{ 6; }
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sub TB_NODEACCESS_MIN()		{ TB_NODEACCESS_READINFO; }
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sub TB_NODEACCESS_MAX()		{ TB_NODEACCESS_MODIFYVLANS; }
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# User Info (modinfo web page, etc).
sub TB_USERINFO_READINFO()	{ 1; }
sub TB_USERINFO_MODIFYINFO()	{ 2; }
sub TB_USERINFO_MIN()		{ TB_USERINFO_READINFO; }
sub TB_USERINFO_MAX()		{ TB_USERINFO_MODIFYINFO; }

# Experiments (also batch experiments).
sub TB_EXPT_READINFO()		{ 1; }
sub TB_EXPT_MODIFY()		{ 2; }
sub TB_EXPT_DESTROY()		{ 3; }
sub TB_EXPT_MIN()		{ TB_EXPT_READINFO; }
sub TB_EXPT_MAX()		{ TB_EXPT_DESTROY; }

# Projects.
sub TB_PROJECT_READINFO()	{ 1; }
sub TB_PROJECT_MAKEGROUP()	{ 2; }
sub TB_PROJECT_EDITGROUP()	{ 3; }
sub TB_PROJECT_DELGROUP()	{ 4; }
sub TB_PROJECT_LEADGROUP()	{ 5; }
sub TB_PROJECT_ADDUSER()	{ 6; }
sub TB_PROJECT_DELUSER()	{ 7; }
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sub TB_PROJECT_MAKEOSID()	{ 8; }
sub TB_PROJECT_DELOSID()	{ 9; }
sub TB_PROJECT_MAKEIMAGEID()	{ 10; }
sub TB_PROJECT_DELIMAGEID()	{ 11; }
sub TB_PROJECT_CREATEEXPT()	{ 12; }
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sub TB_PROJECT_MIN()		{ TB_PROJECT_READINFO; }
sub TB_PROJECT_MAX()		{ TB_PROJECT_CREATEEXPT; }

# OSIDs 
sub TB_OSID_READINFO()		{ 1; }
sub TB_OSID_CREATE()		{ 2; }
sub TB_OSID_DESTROY()		{ 3; }
sub TB_OSID_MIN()		{ TB_OSID_READINFO; }
sub TB_OSID_MAX()		{ TB_OSID_DESTROY; }

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# Magic OSID constants
sub TB_OSID_MBKERNEL()          { "_KERNEL_"; } # multiboot kernel OSID
sub TB_OSID_PXEBOOT()           { "PXEBOOT"; } # osid for def pxe_boot_path
sub TB_OSID_FRISBEE()           { "PXEFRISBEE"; } 

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# ImageIDs
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#
# Clarification:
# READINFO is read-only access to the image and its contents
# (This is what people get for shared images)
# ACCESS means complete power over the image and its [meta]data
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sub TB_IMAGEID_READINFO()	{ 1; }
sub TB_IMAGEID_MODIFYINFO()	{ 2; }
sub TB_IMAGEID_CREATE()		{ 3; }
sub TB_IMAGEID_DESTROY()	{ 4; }
sub TB_IMAGEID_ACCESS()		{ 5; }
sub TB_IMAGEID_MIN()		{ TB_IMAGEID_READINFO; }
sub TB_IMAGEID_MAX()		{ TB_IMAGEID_ACCESS; }
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# Node Log Types
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sub TB_NODELOGTYPE_MISC		{ "misc"; }
sub TB_NODELOGTYPES()		{ ( TB_NODELOGTYPE_MISC ) ; }
sub TB_DEFAULT_NODELOGTYPE()	{ TB_NODELOGTYPE_MISC; }

# Reload Types.
sub TB_RELOADTYPE_NETDISK()	{ "netdisk"; }
sub TB_RELOADTYPE_FRISBEE()	{ "frisbee"; }
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sub TB_DEFAULT_RELOADTYPE()	{ TB_RELOADTYPE_FRISBEE; }
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# Experiment priorities.
sub TB_EXPTPRIORITY_LOW()	{ 0; }
sub TB_EXPTPRIORITY_HIGH()	{ 20; }

# Assign exit status for too few nodes.
sub TB_ASSIGN_TOOFEWNODES()	{ 2; }

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# System PID.
sub TB_OPSPID()			{ $TBOPSPID; }

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#
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# Events we may want to send
#
sub TBDB_TBEVENT_NODESTATE	{ "TBNODESTATE"; }
sub TBDB_TBEVENT_NODEOPMODE	{ "TBNODEOPMODE"; }
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sub TBDB_TBEVENT_CONTROL	{ "TBCONTROL"; }
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#
# For nodes, we use this set of events.
#
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sub TBDB_NODESTATE_ISUP()	{ "ISUP"; }
sub TBDB_NODESTATE_REBOOTED()	{ "REBOOTED"; }
sub TBDB_NODESTATE_REBOOTING()	{ "REBOOTING"; }
sub TBDB_NODESTATE_SHUTDOWN()	{ "SHUTDOWN"; }
sub TBDB_NODESTATE_BOOTING()	{ "BOOTING"; }
sub TBDB_NODESTATE_TBSETUP()	{ "TBSETUP"; }
sub TBDB_NODESTATE_RELOADSETUP() { "RELOADSETUP"; }
sub TBDB_NODESTATE_RELOADING()	{ "RELOADING"; }
sub TBDB_NODESTATE_RELOADDONE()	{ "RELOADDONE"; }
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sub TBDB_NODESTATE_UNKNOWN()	{ "UNKNOWN"; };

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sub TBDB_NODEOPMODE_NORMAL	{ "NORMAL"; }
sub TBDB_NODEOPMODE_DELAYING	{ "DELAYING"; }
sub TBDB_NODEOPMODE_UNKNOWNOS	{ "UNKNOWNOS"; }
sub TBDB_NODEOPMODE_RELOADING	{ "RELOADING"; }
sub TBDB_NODEOPMODE_NORMALv1	{ "NORMALv1"; } 
sub TBDB_NODEOPMODE_MINIMAL	{ "MINIMAL"; } 
sub TBDB_NODEOPMODE_RELOAD	{ "RELOAD"; } 
sub TBDB_NODEOPMODE_DELAY	{ "DELAY"; } 
sub TBDB_NODEOPMODE_BOOTWHAT	{ "_BOOTWHAT_"; } # A redirection opmode
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sub TBDB_NODEOPMODE_UNKNOWN	{ "UNKNOWN"; }

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sub TBDB_TBCONTROL_RESET	{ "RESET"; }
sub TBDB_TBCONTROL_RELOADDONE	{ "RELOADDONE"; }
sub TBDB_TBCONTROL_TIMEOUT	{ "TIMEOUT"; }

# Constant we use for the timeout field when there is no timeout for a state
sub TBDB_NO_STATE_TIMEOUT	{ 0; }

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#
# Node name we use in the widearea_* tables to represent a generic local node.
# All local nodes are considered to have the same network characteristcs.
#
sub TBDB_WIDEAREA_LOCALNODE     { "boss"; }

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#
# We should list all of the DB limits.
#
sub DBLIMIT_NSFILESIZE()	{ (1024 * 16); }

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#
# Virtual nodes must operate within a restricted port range. The range
# is effective across all virtual nodes in the experiment. When an
# experiment is swapped in, allocate a subrange from this and setup
# all the vnodes to allocate from that range. We tell the user this
# range so this they can set up their programs to operate in that range.
#
sub TBDB_LOWVPORT()		{ 30000; }
sub TBDB_MAXVPORT()		{ 60000; }
sub TBDB_PORTRANGE()		{ 256;   }

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#
# Auth stuff.
#

#
# Convert a trust string to the above numeric values.
#
sub TBTrustConvert($)
{
    my($trust_string) = @_;
    my $trust_value = 0;

    #
    # Convert string to value. Perhaps the DB should have done it this way?
    # 
    if ($trust_string eq "none") {
	$trust_value = PROJMEMBERTRUST_NONE;
    }
    elsif ($trust_string eq "user") {
	$trust_value = PROJMEMBERTRUST_USER;
    }
    elsif ($trust_string eq "local_root") {
	$trust_value = PROJMEMBERTRUST_LOCALROOT;
    }
    elsif ($trust_string eq "group_root") {
	$trust_value = PROJMEMBERTRUST_GROUPROOT;
    }
    elsif ($trust_string eq "project_root") {
	$trust_value = PROJMEMBERTRUST_PROJROOT;
    }
    elsif ($trust_string eq "admin") {
	$trust_value = PROJMEMBERTRUST_ADMIN;
    }
    else {
	    die("*** Invalid trust value $trust_string!");
    }

    return $trust_value;
}

#
# Return true if the given trust string is >= to the minimum required.
# The trust value can be either numeric or a string; if a string its
# first converted to the numeric equiv.
#
sub TBMinTrust($$)
{
    my ($trust_value, $minimum) = @_;

    if ($minimum < PROJMEMBERTRUST_NONE ||
	$minimum > PROJMEMBERTRUST_ADMIN) {
	    die("*** Invalid minimum trust $minimum!");
    }

    #
    # Sleazy? How do you do a typeof in perl?
    #
    if (length($trust_value) != 1) {
	$trust_value = TBTrustConvert($trust_value);
    }
    
    return $trust_value >= $minimum;
}

#
# Determine the trust level for a uid/pid/gid. That is, each uid will have
# a different trust level depending on the project/group in question.
# Return that trust level as one of the numeric values above. 
# 
# usage: TBGrpTrust($dbuid, $pid, $gid)
#        returns numeric trust value if a group member.
#        returns PROJMEMBERTRUST_NONE if not a group member.
# 
sub TBGrpTrust($$$)
{
    my ($uid, $pid, $gid) = @_;

    #
    # No group, then use the default group.
    #
    if (! $gid) {
	$gid = $pid;
    }

    my $query_result =
	DBQueryFatal("select trust from group_membership ".
		     "where uid='$uid' and pid='$pid' and gid='$gid'");

    #
    # No membership is the same as no trust. True? Maybe an error instead?
    #
    if ($query_result->numrows == 0) {
	return PROJMEMBERTRUST_NONE;
    }

    my @row = $query_result->fetchrow_array();
    $trust_string = $row[0];

    return TBTrustConvert($trust_string);
}

#
# Determine the project trust level for a uid/pid. This is the trust level
# for the default group in the project.
#
# usage: TBProjTrust($dbuid, $pid)
#        returns numeric trust value if a project member.
#        returns PROJMEMBERTRUST_NONE if not a project member.
# 
sub TBProjTrust($$)
{
    my ($uid, $pid) = @_;
    
    return TBGrpTrust($uid, $pid, $pid);
}

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# Test admin status. Optional argument is the UID or Name to test. If not
# provided, then test the current UID.
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#
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# XXX Argument is *either* a numeric UID, or a string name.
#
# usage: TBAdmin([int or char* uid]);
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#        returns 1 if an admin type.
#        returns 0 if a mere user.
# 
sub TBAdmin(;$)
{
    my($uid) = @_;
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    my($name);
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    #
    # No one is considered an admin unless they have the magic environment
    # variable set (so that you have to be a bit more explict about wanting
    # admin privs.) Use the withadminprivs script to get this variable set.
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    # Also check with HTTP_ at the front of the name, since this is required
    # to get it through suexec from the web scripts.
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    #
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    if (!($ENV{WITH_TB_ADMIN_PRIVS} || $ENV{HTTP_WITH_TB_ADMIN_PRIVS})) {
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	return 0;
    }

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    if (!defined($uid)) {
	$uid = $UID;
    }

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    #
    # Test if numeric. Map to name if it is.
    # 
    if ($uid =~ /^[0-9]+$/) {
	($name) = getpwuid($uid)
	    or die "$uid not in passwd file\n";
    }
    else {
	$name = $uid;
    }
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    my $query_result =
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	DBQueryFatal("select admin from users where uid='$name'");
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    my @row = $query_result->fetchrow_array();
    if ($row[0] == 1) {
	return 1;
    }
    return 0;
}

#
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# Project permission checks. The group id (gid) can be undef, in which case
# the pid is used (ie: a default group check is made).
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#
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# Usage: TBProjAccessCheck($uid, $pid, $gid, $access_type)
#	 returns 0 if not allowed.
#        returns 1 if allowed.
# 
sub TBProjAccessCheck($$$$)
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{
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    my ($uid, $pid, $gid, $access_type) = @_;
    my $mintrust;
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    if ($access_type < TB_PROJECT_MIN ||
	$access_type > TB_PROJECT_MAX) {
	die("*** Invalid access type: $access_type!");
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    }

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    #
    # Admins do whatever they want!
    # 
    if (TBAdmin($uid)) {
	return 1;
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    }
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    $uid = MapNumericUID($uid);

    #
    # No group, then use the default group.
    #
    if (! defined($gid)) {
	$gid = $pid;
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    }

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    if ($access_type == TB_PROJECT_READINFO) {
	$mintrust = PROJMEMBERTRUST_USER;
    }
    elsif ($access_type == TB_PROJECT_CREATEEXPT) {
	$mintrust = PROJMEMBERTRUST_LOCALROOT;
    }
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    elsif ($access_type == TB_PROJECT_DELUSER) {
	$mintrust = PROJMEMBERTRUST_PROJROOT;
    }
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    else {
	die("*** Unexpected access type: $access_type!");
    }

    return TBMinTrust(TBGrpTrust($uid, $pid, $gid), $mintrust);
}

#
# Experiment permission checks.
#
# Usage: TBExptAccessCheck($uid, $pid, $eid, $access_type)
#	 returns 0 if not allowed.
#        returns 1 if allowed.
# 
sub TBExptAccessCheck($$$$)
{
    my ($uid, $pid, $eid, $access_type) = @_;
    my $mintrust;

    if ($access_type < TB_EXPT_MIN ||
	$access_type > TB_EXPT_MAX) {
	die("*** Invalid access type: $access_type!");
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    }

    #
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    # Admins do whatever they want!
    # 
    if (TBAdmin($uid)) {
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	return 1;
    }
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    $uid = MapNumericUID($uid);
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    my $query_result =
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	DBQueryFatal("SELECT gid,expt_head_uid FROM experiments WHERE ".
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		     "eid='$eid' and pid='$pid'");
    
    if ($query_result->numrows == 0) {
	return 0;
    }
    my @row = $query_result->fetchrow_array();
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    my $gid     = $row[0];
    my $creator = $row[1];
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    #
    # An experiment may be destroyed by the experiment creator or the
    # project/group leader.
    # 
    if ($access_type == TB_EXPT_DESTROY) {
	if ($uid eq $creator) {
	    return 1;
	}
	$mintrust = PROJMEMBERTRUST_GROUPROOT;
    }
    elsif ($access_type == TB_EXPT_READINFO) {
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	$mintrust = PROJMEMBERTRUST_USER;
    }
    else {
	$mintrust = PROJMEMBERTRUST_LOCALROOT;
    }

    return TBMinTrust(TBGrpTrust($uid, $pid, $gid), $mintrust);
}

#
# Determine if uid can access a node or list of nodes.
#
# Usage: TBNodeAccessCheck($uid, $access_type, $node_id, ...)
#	 returns 0 if not allowed.
#        returns 1 if allowed.
# 
sub TBNodeAccessCheck($$@)
{
    my ($uid, $access_type) = (shift, shift);
    my @nodelist = @_;
    my $mintrust;

    if ($access_type < TB_NODEACCESS_MIN ||
	$access_type > TB_NODEACCESS_MAX) {
	die("*** Invalid access type: $access_type!");
    }
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    #
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    # Admins do whatever they want!
    # 
    if (TBAdmin($uid)) {
	return 1;
    }
    $uid = MapNumericUID($uid);
 
    if ($access_type == TB_NODEACCESS_READINFO) {
	$mintrust = PROJMEMBERTRUST_USER;
    }
    else {
	$mintrust = PROJMEMBERTRUST_LOCALROOT;
    }

    foreach my $node (@nodelist) {
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	my $query_result =
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	    DBQueryFatal("select trust from reserved as n ".
			 "left join experiments as e on ".
			 "     e.pid=n.pid and e.eid=n.eid ".
			 "left join group_membership as g on ".
			 "     g.pid=e.pid and g.gid=e.gid ".
			 "where g.uid='$uid' and n.node_id='$node'");
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	if ($query_result->numrows == 0) {
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	    return 0;
	}
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	my @row = $query_result->fetchrow_array();

	if (! TBMinTrust($row[0], $mintrust)) {
	    return 0;
	}
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    }
    return 1;
}

#
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# Access checks for an OSID. Tests for tbadmin.
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#
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# Usage: TBOSIDAccessCheck($uid, $osid, $access_type)
#	 returns 0 if not allowed.
#        returns 1 if allowed.
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# 
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sub TBOSIDAccessCheck($$$)
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{
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    my ($uid, $osid, $access_type) = @_;
    my $mintrust;
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    if ($access_type < TB_OSID_MIN || $access_type > TB_OSID_MAX) {
	die("*** Invalid access type $access_type!");
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    }

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    #
    # Admins do whatever they want!
    # 
    if (TBAdmin($uid)) {
	return 1;
    }
    $uid = MapNumericUID($uid);
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    #
    # No GIDs yet.
    #
    my $query_result =
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	DBQueryFatal("SELECT pid,shared FROM os_info WHERE osid='$osid'");
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    if ($query_result->numrows == 0) {
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	return 0;
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    }
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    my @row = $query_result->fetchrow_array();
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    my $pid = $row[0];
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    my $shared = $row[1];
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    #
    # Global OSIDs can be read by anyone.
    # 
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    if ($shared) {
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	if ($access_type == TB_OSID_READINFO) {
	    return 1;
	}
	return 0;
    }
    
    #
    # Otherwise must have proper trust in the project.
    # 
    if ($access_type == TB_OSID_READINFO) {
	$mintrust = PROJMEMBERTRUST_USER;
    }
    else {
	$mintrust = PROJMEMBERTRUST_LOCALROOT;
    }

    return TBMinTrust(TBProjTrust($uid, $pid), $mintrust);
}

#
# Access checks for an ImageID
#
# Usage: TBImageIDAccessCheck($uid, $imageid, $access_type)
#	 returns 0 if not allowed.
#        returns 1 if allowed.
# 
sub TBImageIDAccessCheck($$$)
{
    my ($uid, $imageid, $access_type) = @_;
    my $mintrust;

    if ($access_type < TB_IMAGEID_MIN || $access_type > TB_IMAGEID_MAX) {
	die("*** Invalid access type $access_type!");
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    }
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    #
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    # Admins and root do whatever they want!
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    # 
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    if (TBAdmin($uid) || !$UID || $UID eq "root" || $uid eq "root") {
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	return 1;
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    }
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    $uid = MapNumericUID($uid);

    #
    # No GIDs yet.
    #
    my $query_result =
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	DBQueryFatal("SELECT pid,shared FROM images WHERE imageid='$imageid'");
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    if ($query_result->numrows == 0) {
	return 0;
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    }
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    my @row = $query_result->fetchrow_array();
    my $pid = $row[0];
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    my $shared = $row[1];
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    #
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    # Global ImageIDs can be read by anyone.
    # 
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    if ($shared) {
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	if ($access_type == TB_IMAGEID_READINFO) {
	    return 1;
	}
	return 0;
    }

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    #
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    # Otherwise must have proper trust in the project.
    # 
    if ($access_type == TB_IMAGEID_READINFO) {
	$mintrust = PROJMEMBERTRUST_USER;
    }
    else {
	$mintrust = PROJMEMBERTRUST_LOCALROOT;
    }

    return TBMinTrust(TBProjTrust($uid, $pid), $mintrust);
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}

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#
# Return Project leader. First argument pid.
#
# usage: ProjLeader(char *pid)
#        returns char *leader if a valid pid.
#        returns 0 if an invalid pid.
# 
sub ProjLeader($)
{
    my($pid) = @_;

    my $query_result =
	DBQueryFatal("select head_uid from projects where pid='$pid'");

    if ($query_result->numrows == 0) {
	return 0;
    }

    my @row = $query_result->fetchrow_array();
    return $row[0];
}

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#
# Return Group leader. 
#
# usage: GroupLeader(char *pid, char *gid)
#        returns char *leader if a valid pid.
#        returns 0 if an invalid pid.
# 
sub GroupLeader($$)
{
    my($pid, $gid) = @_;

    my $query_result =
	DBQueryFatal("select leader from groups where ".
		     "pid='$pid' and gid='$gid'");

    if ($query_result->numrows == 0) {
	return 0;
    }

    my @row = $query_result->fetchrow_array();
    return $row[0];
}

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#
# Return Experiment leader. First argument pid. Second argument is eid.
#
# usage: ExpLeader(char *pid, char *eid)
#        returns char *leader if a valid pid/eid.
#        returns 0 if an invalid pid/eid.
# 
sub ExpLeader($$)
{
    my($pid, $eid) = @_;

    my $query_result =
	DBQueryFatal("select expt_head_uid from experiments ".
		     "where eid='$eid' and pid='$pid'");

    if ($query_result->numrows == 0) {
	return 0;
    }

    my @row = $query_result->fetchrow_array();
    return $row[0];
}

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#
# Return Experiment state.
#
# usage: ExpState(char *pid, char *eid)
#        returns state if a valid pid/eid.
#        returns 0 if an invalid pid/eid or if an error.
# 
sub ExpState($$)
{
    my($pid, $eid) = @_;

    my $query_result =
	DBQueryWarn("select state from experiments ".
		    "where eid='$eid' and pid='$pid'");

    if (! $query_result ||
	$query_result->numrows == 0) {
	return 0;
    }

    my @row = $query_result->fetchrow_array();
    return $row[0];
}

#
# Set Experiment state.
#
# usage: SetExpState(char *pid, char *eid, char *state)
#        returns 1 if okay.
#        returns 0 if an invalid pid/eid or if an error.
# 
sub SetExpState($$$)
{
    my($pid, $eid, $state) = @_;

    my $query_result =
	DBQueryWarn("update experiments set state='$state' ".
		    "where eid='$eid' and pid='$pid'");

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    if (! $query_result) {
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	return 0;
    }
    return 1;
}

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#
# Set the swap in/out time for an experiment.
#
# usage: TBSetExpSwapTime(char *pid, char *eid)
#        returns 1 if okay.
#        returns 0 if an invalid pid/eid or if an error.
# 
sub TBSetExpSwapTime($$)
{
    my($pid, $eid) = @_;

    my $query_result =
	DBQueryWarn("update experiments set expt_swapped=now() ".
		    "where eid='$eid' and pid='$pid'");

    if (! $query_result ||
	$query_result->numrows == 0) {
	return 0;
    }
    return 1;
}

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#
# Lock Experiment.
#
# usage: TBLockExp(char *pid, char *eid)
#        returns 1 if okay.
#        returns 0 if an invalid pid/eid or if an error.
# 
sub TBLockExp($$)
{
    my($pid, $eid) = @_;

    my $query_result =
	DBQueryWarn("update experiments set expt_locked=now() ".
		    "where eid='$eid' and pid='$pid'");

    if (! $query_result ||
	$query_result->numrows == 0) {
	return 0;
    }
    return 1;
}

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#
# Test if Experiment is locked
#
# usage: TBExpLocked(char *pid, char *eid)
#        returns 1 if locked.
#        returns 0 if an invalid pid/eid or if an error.
# 
sub TBExpLocked($$)
{
    my($pid, $eid) = @_;

    my $query_result =
	DBQueryWarn("select expt_locked from experiments ".
		    "where eid='$eid' and pid='$pid'");

    if (! $query_result ||
	$query_result->numrows == 0) {
	return 0;
    }
    my @row = $query_result->fetchrow_array();
    if (! defined($row[0])) {
	return 0;
    }
    return 1;
}

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#
# UnLock Experiment.
#
# usage: TBUnLockExp(char *pid, char *eid)
#        returns 1 if okay.
#        returns 0 if an invalid pid/eid or if an error.
# 
sub TBUnLockExp($$)
{
    my($pid, $eid) = @_;

    my $query_result =
	DBQueryWarn("update experiments set expt_locked=NULL ".
		    "where eid='$eid' and pid='$pid'");

    if (! $query_result ||
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	$query_result->numrows == 0) {
	return 0;
    }
    return 1;
}

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#
# Return BatchMode state.
#
# usage: TBBatchState(char *pid, char *eid)
#        returns state if a valid pid/eid.
#        returns 0 if an invalid pid/eid or if an error.
# 
sub TBBatchState($$)
{
    my($pid, $eid) = @_;

    my $query_result =
	DBQueryWarn("select batchstate from experiments ".
		    "where eid='$eid' and pid='$pid' and batchmode=1");

    if (! $query_result ||
	$query_result->numrows == 0) {
	return 0;
    }

    my @row = $query_result->fetchrow_array();
    return $row[0];
}

#
# Set BatctMode state.
#
# usage: SetBatchState(char *pid, char *eid, char *state)
#        returns 1 if okay.
#        returns 0 if an invalid pid/eid or if an error.
# 
sub TBSetBatchState($$$)
{
    my($pid, $eid, $state) = @_;

    my $query_result =
	DBQueryWarn("update experiments set batchstate='$state',batchmode=1 ".
		    "where eid='$eid' and pid='$pid'");

    if (! $query_result ||
	$query_result->numrows == 0) {
	return 0;
    }
    return 1;
}

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#
# Return a list of all the nodes in an experiment.
#
# usage: ExpNodes(char *pid, char *eid)
#        returns the list if a valid pid/eid.
#        returns 0 if an invalid pid/eid or if an error.
# 
sub ExpNodes($$)
{
    my($pid, $eid) = @_;
    my(@row);
    my(@nodes);

    my $query_result =
	DBQueryWarn("select node_id from reserved where ".
		    "pid='$pid' and eid='$eid'");

    if (! $query_result or
	$query_result->numrows == 0) {
	return ();
    }
    while (@row = $query_result->fetchrow_array()) {
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	$node = $row[0];

	#
	# Taint check. I do not understand this sillyness, but if I
	# taint check these node names, I avoid warnings throughout.
	# 
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	if ($node =~ /^([-\w]+)$/) {
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	    $node = $1;
	    
	    push(@nodes, $node);
	}
	else {
	    print "*** $0: WARNING: Bad node name: $node.\n";
	}
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    }
    return @nodes;
}

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#
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# Mark a node as down. We schedule a next reservation for it so that it
# remains in the users experiment through the termination so that there
# are no permission errors (say, from snmpit).
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#
# usage: MarkNodeDown(char *nodeid)
#
sub MarkNodeDown($)
{
    my($node) = $_[0];
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    my($pid, $eid);

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    $pid = NODEDEAD_PID;
    $eid = NODEDEAD_EID;
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    my $query_result =
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	DBQueryFatal("replace into next_reserve " .
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		     "(node_id, pid, eid) " .
		     "values ('$node', '$pid', '$eid')");    
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    if ($query_result->num_rows < 1) {
	DBWarn("WARNING: Could not mark $node down");
    }
}

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#
# Set the boot status for a node.
#
# usage: SetNodeBootStatus(char *status)
#
sub SetNodeBootStatus($$)
{
    my($node, $bstat) = @_;

    DBQueryFatal("update nodes set bootstatus='$bstat' ".
		 "where node_id='$node'");
}

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#
# Check if a particular feature is supported by an OSID. 
#
# usage: OSFeatureSupported(char *osid, char *feature)
#        returns 1 if supported, 0 if not.
#
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sub OSFeatureSupported($$) {
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    my($osid, $feature) = @_;

    my $query_result =
	DBQueryFatal("select osfeatures from os_info where osid='$osid'");

    # Invalid OSID?
    if ($query_result->numrows < 1) {
	return 0;
    }
    
    foreach my $osfeature (split(',', $query_result->fetchrow_array())) {
	if ($feature eq $osfeature) {
	    return 1;
	}
    }
    return 0;
}

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#
# Find out what osid a node will boot next time it comes up, 
# Usually (but not always) the currently running OS as well.
# May also return TB_OSID_MBKERNEL
#
sub TBBootWhat($;$) {
    # WARNING!!!
    #
    # DO NOT change this function without making corresponding changes to
    # the C version of this code in the bootinfo_mysql.c . They MUST
    # ALWAYS find exactly the same resulting OSID given the same inputs.
    # [The only exception is that here we must take into account 
    # *pxe_boot_path since that can specify an OS as well.]
    #
    # Boot priorities go like this:
    # NEXT_PXE_BOOT_PATH
    # PXE_BOOT_PATH
    # NEXT_BOOT_PATH        multiboot kernel
    # DEF_BOOT_PATH         multiboot kernel
    # NEXT_BOOT_OSID        osid from os_info
    # DEF_BOOT_OSID         osid from os_info
    # if all the above are null, error
    my $node = shift || return 0; # error if no node
    my $d = shift || 0; # debug flag
    my $cmd = "select path from os_info where osid='".TB_OSID_PXEBOOT."'";
    my $q = DBQueryFatal($cmd);
    my @r = $q->fetchrow_array();
    my $defpxepath = $r[0];
    $cmd = "select next_pxe_boot_path, pxe_boot_path, 
next_boot_path, def_boot_path, next_boot_osid, def_boot_osid 
from nodes where node_id = '$node'";
    $q = DBQueryFatal($cmd);
    if ($q->numrows() < 1) {
	warn("TBBootWhat: Ignoring invalid node '$node' (non-existent)\n");
	return 0;
    }
    @r = $q->fetchrow_array();
    $nextpxepath=$r[0];
    $pxepath=$r[1];
    $nextpath=$r[2];
    $defpath=$r[3];
    $nextosid=$r[4];
    $defosid=$r[5];
    print "TBBootWhat: $node => (".($nextpxepath?"nextpxe=$nextpxepath, ":"").
	( $pxepath ne $defpxepath ? "pxe=$pxepath, ":"") .
	    "np=$nextpath, dp=$defpath, no=$nextosid, do=$defosid)\n" if $d>1;
    # With PXE paths, look up the osid for the path. If none, use 
    # TB_OSID_MBKERNEL. If it is the default pxe path, just go on like normal.
    if (defined($nextpxepath) && $nextpxepath) {
	if ($nextpxepath ne $defpxepath) {
	    print "TBBootWhat: Using next_pxe_boot_path $nextpxepath\n" if $d;
	    my $cmd = "select osid from os_info where path='$nextpxepath'";
	    my $q = DBQueryFatal($cmd);
	    if ($q->numrows() > 0) {
		my @r = $q->fetchrow_array();
		my $osid = $r[0];
		return $osid;
	    } else {
		return TB_OSID_MBKERNEL;
	    }
	} # else go on as normal
    } else {
	if ($pxepath ne $defpxepath) {
	    print "TBBootWhat: Using pxe_boot_path $pxepath\n" if $d;
	    my $cmd = "select osid from os_info where path='$pxepath'";
	    my $q = DBQueryFatal($cmd);
	    if ($q->numrows() > 0) {
		my @r = $q->fetchrow_array();
		my $osid = $r[0];
		return $osid;
	    } else {
		return TB_OSID_MBKERNEL;
	    }
	} # else go on as normal
    }	
    if ((defined($nextpath) && $nextpath) || 
	(defined($defpath) && $defpath)) {
	# No OSID. Return a magic one.
	print "TBBootWhat: Using {def,next}_boot_path ${nextpath}$defpath\n" 
	    if $d;
	return TB_OSID_MBKERNEL;
    }
    if (defined($nextosid) && $nextosid) { 
	print "TBBootWhat: Using next_boot_osid $nextosid\n" if $d;
	return $nextosid; 
    }
    if (defined($defosid) && $defosid) { 
	print "TBBootWhat: Using def_boot_osid $defosid\n" if $d;
	return $defosid; 
    }
    warn("***Warning: node '$node': All boot info was null!\n");
    return TB_OSID_MBKERNEL;
}

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#
# Ah, what a hack! I'm tired of seeing regexs for sharks scattered around
# the code. Anyway, this checks to see if a node is a shelf, and fills
# in the shelf/node, return 1 if it is. The shelf/node arguments are
# optional, if all you want to do is see if its a shelf type thing.
#
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# usage: IsShelved(char *nodeid, [\$shelf], [\$node])
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#        returns 1 if the node is a shelf type thing. Optionally fills in info.
#        returns 0 if the node is just a normal kind of node.
#
sub IsShelved ($;$$) {
    my($nodeid, $shelf, $node) = @_;

    if ($nodeid =~ /sh(\d+)-(\d+)/) {
	if (defined($shelf)) {
	    $$shelf = $1;
	}
	if (defined($node)) {
	    $$node = $2;
	}
	return 1;
    }
    return 0;
}

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#
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# Map nodeid to its pid/eid/vname. vname is optional.
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#
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# usage: NodeidToExp(char *nodeid, \$pid, \$eid, \$vname)
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#        returns 1 if the node is reserved.
#        returns 0 if the node is not reserved.
#
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sub NodeidToExp ($$$;$) {
    my($nodeid, $pid, $eid, $vname) = @_;
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    my $query_result =
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	DBQueryWarn("select pid,eid,vname from reserved ".
		    "where node_id='$nodeid'");
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    if (! $query_result ||
	! $query_result->num_rows) {
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	return 0;
    }
    
    my @row = $query_result->fetchrow_array();
    $$pid = $row[0];
    $$eid = $row[1];
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    if (defined($vname)) {
	if (defined($row[2])) {
	    $$vname = $row[2];
	}
	else {
	    $$vname = undef;
	}
    }
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    return 1;
}

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#
# Map a pid/eid/vname to its real nodename
#
# usage: VnameToNodeid(char *pid, char * eid, char *vname, \$nodeid)
#        returns 1 if the specified pid/eid/vname exists
#        returns 0 if it does not
#
sub VnameToNodeid ($$$$) {
    my($pid, $eid, $vname, $nodeid) = @_;

    my $query_result =
	DBQueryWarn("select node_id from reserved ".
		    "where pid='$pid' and eid='$eid' and vname='$vname'");

    if (! $query_result ||
	! $query_result->num_rows) {
	return 0;
    }
    
    my @row = $query_result->fetchrow_array();
    $$nodeid = $row[0];
    return 1;
}


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#
# Get the default ImageID for a particular node, from the node_types table.
#
# usage: DefaultImageID(char *nodeid)
#        returns imageid if the node is valid and has a default imageid.
#        returns 0 if there are problems.
#
sub DefaultImageID ($) {
    my($nodeid) = @_;

    my $query_result =
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	DBQueryFatal("select imageid from nodes as n ".
		     "left join node_types as t on t.type=n.type ".
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		     "where n.node_id='$nodeid'");

    if (! $query_result->num_rows) {
	return 0;
    }
    
    my @row = $query_result->fetchrow_array();
    return $row[0];
}

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#
# Convert user pid/name to internal imageid.
#
# usage: TBImageID(char *pid, char *imagename)
#        returns imageid if its valid.
#        returns 0 if not valid.
#
sub TBImageID ($$) {
    my($pid, $imagename) = @_;

    my $query_result =
	DBQueryFatal("select imageid from images ".
		     "where pid='$pid' and imagename='$imagename'");

    if (! $query_result->num_rows) {
	return 0;
    }
    
    my @row = $query_result->fetchrow_array();
    return $row[0];
}

#
# Convert user pid/name to internal osid.
#
# usage: TBOSID(char *pid, char *isname)
#        returns osid if its valid.
#        returns 0 if not valid.
#
sub TBOSID ($$) {
    my($pid, $osname) = @_;

    my $query_result =
	DBQueryFatal("select osid from os_info ".
		     "where pid='$pid' and osname='$osname'");

    if (! $query_result->num_rows) {
	return 0;
    }
    
    my @row = $query_result->fetchrow_array();
    return $row[0];
}

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#
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# Map login (db uid) to a user_name and user_email.
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#
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# usage: UserDBInfo(char *dbuid, \$name, \$email)
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#        returns 1 if the UID is okay.
#        returns 0 if the UID is bogus.
#
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sub UserDBInfo ($$$) {
    my($dbuid, $username, $useremail) = @_;
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    my $query_result =
	DBQueryFatal("select usr_name,usr_email from users ".
		     "where uid='$dbuid'");

    if ($query_result->num_rows < 1) {
	return 0;
    }

    my @row = $query_result->fetchrow_array();
    $$username  = $row[0];
    $$useremail = $row[1];
    return 1;
}

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#
# Map pid,gid to its unix_gid and unix_name.
#
# usage: TBGroupUnixInfo(char $pid, char *gid, \$unix_gid, \$unix_name)
#        returns 1 if okay.
#        returns 0 if bogus.
#
sub TBGroupUnixInfo ($$$$) {
    my($pid, $gid, $unix_gid, $unix_name) = @_;

    my $query_result =
	DBQueryFatal("select unix_gid,unix_name from groups ".
		     "where pid='$pid' and gid='$gid'");

    if ($query_result->num_rows < 1) {
	return 0;
    }

    my @row = $query_result->fetchrow_array();
    $$unix_gid  = $row[0];
    $$unix_name = $row[1];
    return 1;
}

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#
# Return a list of the additional Unix groups a user is in.
#
# usage: TBUnixGroupList(char $dbuid)
#        returns list if there is one.
#        returns () if failed or no list.
#
sub TBUnixGroupList ($) {
    my($dbuid) = @_;
    my @glist = ();

    my $query_result =
	DBQueryFatal("select gid from unixgroup_membership ".
		     "where uid='$dbuid'");

    if ($query_result->num_rows == 0) {
	return ();
    }
    
    while (@row = $query_result->fetchrow_array()) {
	push(@glist, $row[0]);
    }
    return @glist;
}

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#
# Map UID to DB UID (login). Does a DB check to make sure user is known to
# the DB (user obviously has a regular account), and that account will
# always match what the DB says. Redundant, I know. But consider it a
# sanity (or consistency) check. 
#
# usage: UNIX2DBUID(int uid, \$login)
#        returns 1 if the UID is okay.
#        returns 0 if the UID is bogus.
#
sub UNIX2DBUID ($$) {
    my($unix_uid, $userlogin) = @_;
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    my $query_result =
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	DBQueryFatal("select uid from users where unix_uid='$unix_uid'");
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    if ($query_result->num_rows < 1) {
	return 0;
    }
    my @row = $query_result->fetchrow_array();
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    my ($pwname) = getpwuid($unix_uid) or
	die("*** $unix_uid is not in the password file!");

    if ($row[0] ne $pwname) {
	warn("*** WARNING: $pwname does not match $row[0]\n");
	return 0;
    }

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    $$userlogin = $row[0];
    return 1;
}

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#
# Validate a node log type.
#
# usage: TBValidNodeLogType(char *type)
#        Returns 1 if the type string is valid.
#        Returns 0 if not.
#
sub TBValidNodeLogType($)
{
    my($type) = @_;

    foreach my $actype ( TB_NODELOGTYPES ) {
	if ($actype eq $type) {
	    return 1;
	}
    }

    return 0;
}

#
# Insert a Log entry for a node.
#
# usage: TBSetNodeLogEntry(char *node, char *type, char *message)
#        Returns 1 if okay.
#        Returns 0 if failed.
#
sub TBSetNodeLogEntry($$$$)
{
    my($node, $dbuid, $type, $message) = @_;

    if (! TBValidNodeName($node) || !TBValidNodeLogType($type)) {
	return 0;
    }
    return DBQueryWarn("insert into nodelog ".
		       "values ".
                       "('$node', NULL, '$type', '$dbuid', $message, now())");
}

#
# Validate a node name.
#
# usage: TBValidNodeName(char *name)
#        Returns 1 if the node is valid.
#        Returns 0 if not.
#
sub TBValidNodeName($)
{
    my($node) = @_;

    my $query_result =
	DBQueryWarn("select node_id from nodes where node_id='$node'");

    if ($query_result->numrows == 0) {
	return 0;
    }
    return 1;
}

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#
# Set the scheduled_reloads for a node. Type is optional and defaults to
# testbed default load type. See above.
#
# usage: TBSetSchedReload(char *node, char *imageid, [char *reload_type])
#        Returns 1 if okay.
#        Returns 0 if failed.
#
sub TBSetSchedReload($$;$)
{
    my ($node, $imageid, $type) = @_;

    if (!defined($type)) {
	$type = TB_DEFAULT_RELOADTYPE;
    }

    if (DBQueryWarn("replace into scheduled_reloads ".
		    "(node_id, image_id, reload_type) values ".
		    "('$node', '$imageid', '$type')")) {
	return 1;
    }
    return 0;
}

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#
# Set event state for a node.
#
# usage: TBSetNodeEventState(char *node, char *state)
#        Returns 1 if okay.
#        Returns 0 if failed.
#
sub TBSetNodeEventState($$)
{
    my ($node, $state) = @_;

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    #
    # If using the event system, we send out an event for the state daemon to
    # pick up. Otherwise, we just set the state in the database ourselves
    #
    if ($EVENTSYS) {
	return EventSendFatal(objtype   => TBDB_TBEVENT_NODESTATE,
			      objname   => $node,
			      eventtype => $state,
			      host      => $BOSSNODE);
    } else {
	my $now = time();
	return DBQueryFatal("update nodes set eventstate='$state', " .
			    "state_timestamp=$now where node_id='$node'");
    }
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}

#
# Get event state for a node.
#
# usage: TBGetNodeEventState(char *node, char \*state)
#        Returns 1 if okay (and sets state).
#        Returns 0 if failed.
#
sub TBGetNodeEventState($$)
{
    my ($node, $state) = @_;

    my $query_result =
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    if ($query_result->numrows == 0) {
	return 0;
    }
    my @row = $query_result->fetchrow_array();
    if (defined($row[0])) {
	$$state = $row[0];
    }
    else {
	$$state = TBDB_NODESTATE_UNKNOWN;
    }
    return 1;
}

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#
# Check if a node has timed out in its current state. If it has, it gets 
# stated involved to handle the situation.
#
# usage: TBNodeStateTimeout(char *node)
#        Returns 1 if it has timed out and stated was notified
#        Returns 0 if it is okay (still within time limits)
#
sub TBNodeStateTimeout($)
{
    my ($node) = @_;
    
    my $notimeout = TBDB_NO_STATE_TIMEOUT;

    my $query_result =
	DBQueryFatal("select now() - state_timestamp > timeout as over, ".
		     "timeout='$notimeout' as none ".
		     "from nodes as n left join state_timeouts as st ".
		     "on n.eventstate=st.state and n.op_mode=st.op_mode ".
		     "where node_id='$node'");

    if ($query_result->numrows == 0) {
	warn("*** TBNodeStateTimeout: Couldn't check node '$node'\n");
	return 0;
    }
    my ($over,$none) = $query_result->fetchrow_array();
    if ($over && !$none) {
	# We're overtime... send an event and return 1
	if ($EVENTSYS) {
	    EventSendFatal(objtype   => TBDB_TBEVENT_CONTROL,
			   objname   => $node,
			   eventtype => TBDB_TBCONTROL_TIMEOUT,
			   host      => $BOSSNODE);
	} else {
	    # Don't know what to do... how are state timeouts handled
	    # if we don't have stated?
	}
	return 1;
    } else {
	# We're good... return 0
	return 0;
    }
}   

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#
# Set operational mode for a node.
#
# usage: TBSetNodeOpMode(char *node, char *mode)
#        Returns 1 if okay.
#        Returns 0 if failed.
#
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# DEPRECATED - stated handles these transitions now
#
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sub TBSetNodeOpMode($$)
{
    my ($node, $mode) = @_;

    #
    # If using the event system, we send out an event for the state daemon to
    # pick up. Otherwise, we just set the mode in the database ourselves
    #
    if ($EVENTSYS) {
	return EventSendFatal(objtype   => TBDB_TBEVENT_NODEOPMODE,
			      objname   => $node,
			      eventtype => $mode,
			      host      => $BOSSNODE);
    } else {
	my $now = time();
	return DBQueryFatal("update nodes set op_mode='$mode', " .
			    "op_mode_timestamp=$now where node_id='$node'");
    }
}

#
# Get operational mode for a node.
#
# usage: TBGetNodeOpMode(char *node, char \*mode)
#        Returns 1 if okay (and sets state).
#        Returns 0 if failed.
#
sub TBGetNodeOpMode($$)
{
    my ($node, $mode) = @_;

    my $query_result =
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	DBQueryFatal("select op_mode from nodes where node_id='$node'");
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    if ($query_result->numrows == 0) {
	return 0;
    }
    my @row = $query_result->fetchrow_array();
    if (defined($row[0])) {
	$$mode = $row[0];
    }
    else {
	$$mode = TBDB_NODEOPMODE_UNKNOWN;
    }
    return 1;
}

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#
# Is a node remote?
#
# usage TBIsNodeRemote(char *node)
#        Returns 1 if yes.
#        Returns 0 if no.
#
sub TBIsNodeRemote($)
{
    my ($nodeid) = @_;

    my $query_result =
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	DBQueryFatal("select isremotenode from nodes as n ".
		     "left join node_types as t on t.type=n.type ".
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		     "where n.node_id='$nodeid'");

    if (! $query_result->num_rows) {
	return 0;
    }
    
    my @row = $query_result->fetchrow_array();
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    return($row[0]);
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}

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#
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# Is a node virtual (or "multiplexed"). Optionally return jailflag.
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#
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# usage TBIsNodeVirtual(char *node, int *jailed)
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#        Returns 1 if yes.
#        Returns 0 if no.
#
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sub TBIsNodeVirtual($;$)
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{
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    my ($nodeid, $jailed) = @_;
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    my $query_result =
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	DBQueryFatal("select isvirtnode,n.jailflag from nodes as n ".
		     "left join node_types as t on t.type=n.type ".
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		     "where n.node_id='$nodeid'");

    if (! $query_result->num_rows) {
	return 0;
    }
    
    my @row = $query_result->fetchrow_array();
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    if (defined($jailed)) {
	$$jailed = $row[1];
    }
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    return($row[0]);
}

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#
# Set/Clear the current logfile for an experiment. The idea is to provide
# a way to look at what is going on from the web interface!
#
# usage TBExptSetLogFile(char *pid, char *eid, char *logname)
#
sub TBExptSetLogFile($$$)
{
    my ($pid, $eid, $logname) = @_;
    
    DBQueryFatal("update experiments set logfile='$logname' ".
		 "where pid='$pid' and eid='$eid'");
}

sub TBExptClearLogFile($$)
{
    my ($pid, $eid) = @_;
    
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    DBQueryFatal("update experiments set logfile=NULL,logfile_open=0 ".
		 "where pid='$pid' and eid='$eid'");
}

#
# Flag the logfile as either open or closed. This allows the spew code
# to determine when the log is no longer being appended to. Is there a
# system oriented way to do this?
# 
# usage TBExptOpenLogFile(char *pid, char *eid)
# usage TBExptCloseLogFile(char *pid, char *eid)
#
sub TBExptOpenLogFile($$)
{
    my ($pid, $eid) = @_;
    
    DBQueryFatal("update experiments set logfile_open=1 ".
		 "where pid='$pid' and eid='$eid'");
}

sub TBExptCloseLogFile($$)
{
    my ($pid, $eid) = @_;
    
    DBQueryFatal("update experiments set logfile_open=0 ".
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		 "where pid='$pid' and eid='$eid'");
}

#
# Get the current logfile for an experiment. 
#
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# usage TBExptGetLogFile(char *pid, char *eid, char \*logname, int \isopen)