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<?php
#
# Database Constants
#
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$TBDBNAME       = "@TBDBNAME@";
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$TBDB_UIDLEN    = 8;
$TBDB_PIDLEN    = 12;
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$TBDB_GIDLEN	= 12;
$TBDB_UNIXGLEN	= 16;
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$TBDB_NODEIDLEN = 10;
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#
# Current policy is to prefix the EID with the PID. Make sure it is not
# too long for the database. PID is 12, and the max is 32, so the user
# cannot have provided an EID more than 19, since other parts of the system
# may concatenate them together with a hyphen.
#
$TBDB_EIDLEN    = 19;

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$TBDB_OSID_OSIDLEN         = 30;
$TBDB_OSID_VERSLEN         = 12;
$TBDB_IMAGEID_IMAGEIDLEN   = 30;
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#
# Trust. Define the trust level as an increasing value. Then define a
# function to return whether the given trust is high enough.
#
$TBDB_TRUST_NONE		= 0;
$TBDB_TRUST_USER		= 1;
$TBDB_TRUST_LOCALROOT		= 2;
$TBDB_TRUST_GROUPROOT		= 3;
$TBDB_TRUST_PROJROOT		= 4;
$TBDB_TRUST_ADMIN		= 5;

#
# These are the permission types. Different operations for the varying
# types of things we need to control access to.
#
# Things you can do to a node.
$TB_NODEACCESS_READINFO		= 1;
$TB_NODEACCESS_MODIFYINFO	= 2;
$TB_NODEACCESS_LOADIMAGE	= 3;
$TB_NODEACCESS_REBOOT		= 4;
$TB_NODEACCESS_POWERCYCLE	= 5;
$TB_NODEACCESS_MIN		= $TB_NODEACCESS_READINFO;
$TB_NODEACCESS_MAX		= $TB_NODEACCESS_POWERCYCLE;

# User Info (modinfo web page, etc).
$TB_USERINFO_READINFO		= 1;
$TB_USERINFO_MODIFYINFO		= 2;
$TB_USERINFO_MIN		= $TB_USERINFO_READINFO;
$TB_USERINFO_MAX		= $TB_USERINFO_MODIFYINFO;

# Experiments (also batch experiments).
$TB_EXPT_READINFO		= 1;
$TB_EXPT_MODIFY			= 2;	# Allocate/dealloc nodes
$TB_EXPT_DESTROY		= 3;
$TB_EXPT_MIN			= $TB_EXPT_READINFO;
$TB_EXPT_MAX			= $TB_EXPT_DESTROY;

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

# OSIDs 
$TB_OSID_READINFO		= 1;
$TB_OSID_MODIFYINFO		= 2;
$TB_OSID_DESTROY		= 3;
$TB_OSID_MIN			= $TB_OSID_READINFO;
$TB_OSID_MAX			= $TB_OSID_DESTROY;

# ImageIDs
$TB_IMAGEID_READINFO		= 1;
$TB_IMAGEID_MODIFYINFO		= 2;
$TB_IMAGEID_ACCESS		= 3;
$TB_IMAGEID_DESTROY		= 4;
$TB_IMAGEID_MIN			= $TB_IMAGEID_READINFO;
$TB_IMAGEID_MAX			= $TB_IMAGEID_DESTROY;

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# Experiment states (that matter to us).
$TB_EXPTSTATE_SWAPPED		= "swapped";
$TB_EXPTSTATE_ACTIVE		= "active";

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#
# Convert a trust string to the above numeric values.
#
function TBTrustConvert($trust_string)
{
    global $TBDB_TRUST_NONE;
    global $TBDB_TRUST_USER;
    global $TBDB_TRUST_LOCALROOT;
    global $TBDB_TRUST_GROUPROOT;
    global $TBDB_TRUST_PROJROOT;
    global $TBDB_TRUST_ADMIN;
    $trust_value = 0;

    #
    # Convert string to value. Perhaps the DB should have done it this way?
    # 
    if (strcmp($trust_string, "none") == 0) {
	    $trust_value = $TBDB_TRUST_NONE;
    }
    elseif (strcmp($trust_string, "user") == 0) {
	    $trust_value = $TBDB_TRUST_USER;
    }
    elseif (strcmp($trust_string, "local_root") == 0) {
	    $trust_value = $TBDB_TRUST_LOCALROOT;
    }
    elseif (strcmp($trust_string, "group_root") == 0) {
	    $trust_value = $TBDB_TRUST_GROUPROOT;
    }
    elseif (strcmp($trust_string, "project_root") == 0) {
	    $trust_value = $TBDB_TRUST_PROJROOT;
    }
    elseif (strcmp($trust_string, "admin") == 0) {
	    $trust_value = $TBDB_TRUST_ADMIN;
    }
    else {
	    TBERROR("Invalid trust value $trust_string!", 1);
    }

    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.
#
function TBMinTrust($trust_value, $minimum)
{
    global $TBDB_TRUST_NONE;
    global $TBDB_TRUST_ADMIN;

    if ($minimum < $TBDB_TRUST_NONE || $minimum > $TBDB_TRUST_ADMIN) {
	    TBERROR("Invalid minimum trust $minimum!", 1);
    }

    #
    # Sleazy?
    #
    if (gettype($trust_value) == "string") {
	$trust_value = TBTrustConvert($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. 
# 
function TBGrpTrust($uid, $pid, $gid)
{
    global $TBDB_TRUST_NONE;

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

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

    #
    # No membership is the same as no trust. True? Maybe an error instead?
    # 
    if (mysql_num_rows($query_result) == 0) {
	return $TBDB_TRUST_NONE;
    }
    $row = mysql_fetch_array($query_result);
    $trust_string = $row[trust];

    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.
# 
function TBProjTrust($uid, $pid)
{
    return TBGrpTrust($uid, $pid, $pid);
}

#
# Project permission checks. The group id (gid) can be zero, in which case
# the pid is used (ie: a default group check is made).
#
# Usage: TBProjAccessCheck($uid, $pid, $gid, $access_type)
#	 returns 0 if not allowed.
#        returns 1 if allowed.
# 
function TBProjAccessCheck($uid, $pid, $gid, $access_type)
{
    global $TB_PROJECT_READINFO;
    global $TB_PROJECT_MAKEGROUP;
    global $TB_PROJECT_EDITGROUP;
    global $TB_PROJECT_DELGROUP;
    global $TB_PROJECT_LEADGROUP;
    global $TB_PROJECT_ADDUSER;
    global $TB_PROJECT_DELUSER;
    global $TB_PROJECT_MAKEOSID;
    global $TB_PROJECT_DELOSID;
    global $TB_PROJECT_MAKEIMAGEID;
    global $TB_PROJECT_DELIMAGEID;
    global $TB_PROJECT_CREATEEXPT;
    global $TB_PROJECT_MIN;
    global $TB_PROJECT_MAX;
    global $TBDB_TRUST_USER;
    global $TBDB_TRUST_LOCALROOT;
    global $TBDB_TRUST_GROUPROOT;
    global $TBDB_TRUST_PROJROOT;
    $mintrust;

    if ($access_type < $TB_PROJECT_MIN ||
	$access_type > $TB_PROJECT_MAX) {
	TBERROR("Invalid access type: $access_type!", 1);
    }

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

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

    if ($access_type == $TB_PROJECT_READINFO) {
	$mintrust = $TBDB_TRUST_USER;
    }
    elseif ($access_type == $TB_PROJECT_MAKEGROUP ||
	    $access_type == $TB_PROJECT_EDITGROUP ||
	    $access_type == $TB_PROJECT_DELGROUP) {
	$mintrust = $TBDB_TRUST_PROJROOT;
    }
    elseif ($access_type == $TB_PROJECT_LEADGROUP) {
	#
	# Must be at least local root to lead a group.
	# 
	$mintrust = $TBDB_TRUST_LOCALROOT;
    }
    elseif ($access_type == $TB_PROJECT_MAKEOSID ||
	    $access_type == $TB_PROJECT_MAKEIMAGEID ||
	    $access_type == $TB_PROJECT_CREATEEXPT) {
	$mintrust = $TBDB_TRUST_LOCALROOT;
    }
    elseif ($access_type == $TB_PROJECT_ADDUSER) {
	if ($gid == $pid) {
	    $mintrust = $TBDB_TRUST_PROJROOT;
	}
	else {
	    $mintrust = $TBDB_TRUST_GROUPROOT;
	}
    }
    else {
	TBERROR("Unexpected access type: $access_type!", 1);
    }

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

#
# Experiment permission checks.
#
# Usage: TBExptAccessCheck($uid, $pid, $eid, $access_type)
#	 returns 0 if not allowed.
#        returns 1 if allowed.
# 
function TBExptAccessCheck($uid, $pid, $eid, $access_type)
{
    global $TB_EXPT_READINFO;
    global $TB_EXPT_MODIFY;
    global $TB_EXPT_DESTROY;
    global $TB_EXPT_MIN;
    global $TB_EXPT_MAX;
    global $TBDB_TRUST_USER;
    global $TBDB_TRUST_LOCALROOT;
    global $TBDB_TRUST_GROUPROOT;
    global $TBDB_TRUST_PROJROOT;
    $mintrust;

    if ($access_type < $TB_EXPT_MIN ||
	$access_type > $TB_EXPT_MAX) {
	TBERROR("Invalid access type: $access_type!", 1);
    }

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

    $query_result =
	DBQueryFatal("SELECT gid FROM experiments WHERE ".
		     "eid='$eid' and pid='$pid'");
    
    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    $row = mysql_fetch_array($query_result);
    $gid = $row[pid];

    if ($access_type == $TB_EXPT_READINFO) {
	$mintrust = $TBDB_TRUST_USER;
    }
    else {
	$mintrust = $TBDB_TRUST_LOCALROOT;
    }

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

#
# Determine if uid can access a node (read or modify).
#
# Usage: TBNodeAccessCheck($uid, $node_id, $access_type)
#	 returns 0 if not allowed.
#        returns 1 if allowed.
# 
function TBNodeAccessCheck($uid, $node_id, $access_type)
{
    global $TB_NODEACCESS_READINFO;
    global $TB_NODEACCESS_MODIFYINFO;
    global $TB_NODEACCESS_LOADIMAGE;
    global $TB_NODEACCESS_REBOOT;
    global $TB_NODEACCESS_POWERCYCLE;
    global $TB_NODEACCESS_MIN;
    global $TB_NODEACCESS_MAX;
    global $TBDB_TRUST_USER;
    global $TBDB_TRUST_LOCALROOT;
    $mintrust;

    if ($access_type < $TB_NODEACCESS_MIN ||
	$access_type > $TB_NODEACCESS_MAX) {
	TBERROR("Invalid access type: $access_type!", 1);
    }

    $query_result =
	DBQueryFatal("select node_id,trust from reserved as n ".
		     "left join experiments as e on ".
		     "     e.pid=n.pid and e.eid=n.eid ".
		     "left join group_membership as g on ".
		     "     g.pid=e.pid and g.gid=e.gid ".
		     "where g.uid='$uid' and n.node_id='$node_id'");

    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    $foorow = mysql_fetch_array($query_result);
    $trust  = $foorow[trust];

    if ($access_type == $TB_NODEACCESS_READINFO) {
	$mintrust = $TBDB_TRUST_USER;
    }
    else {
	$mintrust = $TBDB_TRUST_LOCALROOT;
    }

    return TBMinTrust($trust, $mintrust);
}

#
# Determine if uid can access a another user record (read or modify).
#
# Usage: TBUserInfoAccessCheck($uid, $target_uid, $access_type)
#	 returns 0 if not allowed.
#        returns 1 if allowed.
# 
function TBUserInfoAccessCheck($uid, $target_uid, $access_type)
{
    global $TB_USERINFO_READINFO;
    global $TB_USERINFO_MODIFYINFO;
    global $TB_USERINFO_MIN;
    global $TB_USERINFO_MAX;

    if ($access_type < $TB_USERINFO_MIN || $access_type > $TB_USERINFO_MAX) {
	TBERROR("Invalid access type $access_type!", 1);
    }

    if (strcmp($uid, $target_uid) == 0) {
	return 1;
    }

    #
    # This join will allow the operation if the current user is in the same
    # group (any group) as the target user, but with root permissions.
    # 
    $query_result =
	DBQueryFatal("select g.trust from group_membership as g ".
		     "left join group_membership as authed on ".
		     "     g.pid=authed.pid and g.gid=authed.gid and ".
		     "     g.uid='$target_uid' ".
		     "where authed.uid='$uid' and ".
		     "      (authed.trust='group_root' or ".
		     "       authed.trust='project_root')");

    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    return 1;
}

#
# Access checks for an OSID. Tests for tbadmin.
#
# Usage: TBOSIDAccessCheck($uid, $osid, $access_type)
#	 returns 0 if not allowed.
#        returns 1 if allowed.
# 
function TBOSIDAccessCheck($uid, $osid, $access_type)
{
    global $TB_OSID_READINFO;
    global $TB_OSID_MODIFYINFO;
    global $TB_OSID_DESTROY;
    global $TB_OSID_MIN;
    global $TB_OSID_MAX;
    global $TBDB_TRUST_USER;
    global $TBDB_TRUST_LOCALROOT;
    $mintrust;

    if ($access_type < $TB_OSID_MIN || $access_type > $TB_OSID_MAX) {
	TBERROR("Invalid access type $access_type!", 1);
    }

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

    #
    # No GIDs yet.
    #
    $query_result =
	DBQueryFatal("SELECT pid FROM os_info WHERE osid='$osid'");
    
    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    $row = mysql_fetch_array($query_result);
    $pid = $row[pid];

    #
    # Global OSIDs can be read by anyone.
    # 
    if (!$pid) {
	if ($access_type == $TB_OSID_READINFO) {
	    return 1;
	}
	return 0;
    }
    
    #
    # Otherwise must have proper trust in the project.
    # 
    if ($access_type == $TB_OSID_READINFO) {
	$mintrust = $TBDB_TRUST_USER;
    }
    else {
	$mintrust = $TBDB_TRUST_LOCALROOT;
    }

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

#
# Access checks for an ImageID
#
# Usage: TBImageIDAccessCheck($uid, $imageid, $access_type)
#	 returns 0 if not allowed.
#        returns 1 if allowed.
# 
function TBImageIDAccessCheck($uid, $imageid, $access_type)
{
    global $TB_IMAGEID_READINFO;
    global $TB_IMAGEID_MODIFYINFO;
    global $TB_IMAGEID_DESTROY;
    global $TB_IMAGEID_ACCESS;
    global $TB_IMAGEID_MIN;
    global $TB_IMAGEID_MAX;
    global $TBDB_TRUST_USER;
    global $TBDB_TRUST_LOCALROOT;
    $mintrust;

    if ($access_type < $TB_IMAGEID_MIN || $access_type > $TB_IMAGEID_MAX) {
	TBERROR("Invalid access type $access_type!", 1);
    }

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

    #
    # No GIDs yet.
    #
    $query_result =
	DBQueryFatal("SELECT pid FROM images WHERE imageid='$imageid'");
    
    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    $row = mysql_fetch_array($query_result);
    $pid = $row[pid];

    #
    # Global ImageIDs can be read by anyone.
    # 
    if (!$pid) {
	if ($access_type == $TB_IMAGEID_READINFO) {
	    return 1;
	}
	return 0;
    }

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

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

#
# Return the Unix GID Name and Number for a group. This is distinct from
# the name we use within the Testbed system.
#
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# usage: TBGroupUnixInfo($pid, $gid, &$unix_gid, &$unix_name)
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#
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function TBGroupUnixInfo($pid, $gid, &$unix_gid, &$unix_name)
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{
    $query_result =
	DBQueryFatal("select unix_name,unix_gid from groups ".
		     "where pid='$pid' and gid='$gid'");

    if (mysql_num_rows($query_result) == 0) {
	TBERROR("No such group $gid in project $pid!", 1);
    }
    $row = mysql_fetch_array($query_result);
    $unix_gid  = $row[unix_gid];
    $unix_name = $row[unix_name];
}

#
# Get name and email info for a uid. Args are pass by reference.
#
# usage: TBUserInfo($uid, $user_name, $user_email)
#
function TBUserInfo($uid, &$user_name, &$user_email)
{
    $query_result =
	DBQueryFatal("select usr_name,usr_email from users where uid='$uid'");

    if (mysql_num_rows($query_result) == 0) {
	TBERROR("No such user $uid!", 1);
    }
    $row = mysql_fetch_array($query_result);
    $user_name  = $row[usr_name];
    $user_email = $row[usr_email];
}

#
# Confirm a valid pid/gid
#
# usage TBValidGroup($pid, $gid)
#       returns 1 if a valid group.
#       returns 0 if not a valid group
#
function TBValidGroup($pid, $gid)
{
    $query_result =
	DBQueryFatal("select pid,gid from groups as g ".
		     "where pid='$pid' and gid='$gid'");

    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }

    #
    # XXX String compare to ensure case match. 
    #
    $row = mysql_fetch_row($query_result);
    if (strcmp($row[0], $pid) ||
	strcmp($row[1], $gid)) {
	return 0;
    }
    return 1;
}

#
# Confirm a group member.
#
# usage TBGroupMember($uid, $pid, $gid, &$approved)
#       returns 1 if a member.
#       returns 0 if not a member.
#
function TBGroupMember($uid, $pid, $gid, &$approved)
{
    global $TBDB_TRUST_USER;
	
    $approved = 0;
    
    $query_result =
	DBQueryFatal("select trust from group_membership ".
		     "where uid='$uid' and pid='$pid' and gid='$gid'");

    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    $row = mysql_fetch_row($query_result);
    $trust = $row[0];

    $approved = TBMinTrust($trust, $TBDB_TRUST_USER);
    return 1;
}

#
# Confirm a valid osid.
#
# usage TBValidOSID($osid)
#       returns 1 if valid
#       returns 0 if not valid
#
function TBValidOSID($osid)
{
    $query_result =
	DBQueryFatal("select osid from os_info where osid='$osid'");

    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    return 1;
}

#
# Confirm a valid imageid.
#
# usage TBValidImageID($imageid)
#       returns 1 if valid
#       returns 0 if not valid
#
function TBValidImageID($imageid)
{
    $query_result =
	DBQueryFatal("select imageid from images where imageid='$imageid'");

    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    return 1;
}

#
# Confirm a valid experiment.
#
# usage TBValidExperiment($pid, $eid)
#       returns 1 if valid
#       returns 0 if not valid
#
function TBValidExperiment($pid, $eid)
{
    $query_result =
	DBQueryFatal("select eid from experiments ".
		     "where eid='$eid' and pid='$pid'");

    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    return 1;
}

#
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# Confirm a valid node name.
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#
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# usage TBValidNodeName($node)
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#       returns 1 if valid
#       returns 0 if not valid
#
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function TBValidNodeName($node)
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{
    $query_result =
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	DBQueryFatal("select node_id from nodes where node_id='$node'");
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    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    return 1;
}

#
# Return Project Leader.
#
# usage TBProjLeader($pid, &$projleader)
#       returns 1 if valid
#       returns 0 if not valid
#
function TBProjLeader($pid, &$projleader)
{
    $query_result =
	DBQueryFatal("select head_uid from projects where pid='$pid'");

    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    $row = mysql_fetch_array($query_result);
    $projleader  = $row[head_uid];
    
    return 1;
}

#
# Return a list of projects for which the uid is allowed to perform the
# requested operation. Only a couple of access options are supported since
# to be totally general would require too many DB operations. Not worth
# the effort or the expense.
#
function TBProjList($uid, $access_type)
{
    global $TB_PROJECT_CREATEEXPT;
    global $TB_PROJECT_MAKEOSID;
    global $TB_PROJECT_MAKEIMAGEID;
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    global $TB_PROJECT_MAKEGROUP;
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    $result = array();
    
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    if ($access_type == $TB_PROJECT_MAKEGROUP) {
	$trust_clause = "trust='project_root'";
    }
    elseif ($access_type == $TB_PROJECT_CREATEEXPT ||
	    $access_type == $TB_PROJECT_MAKEOSID ||
	    $access_type == $TB_PROJECT_MAKEIMAGEID) {
	$trust_clause = "(trust='project_root' or trust='group_root' or ".
	                " trust='local_root')";
    }
    else {
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	TBERROR("Invalid access type $access_type!", 1);
    }
    
    $query_result =
	DBQueryFatal("SELECT distinct pid FROM group_membership ".
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		     "WHERE uid='$uid' and $trust_clause");
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    if (mysql_num_rows($query_result) == 0) {
	return $result;
    }

    $i = 0;
    while ($row = mysql_fetch_array($query_result)) {
	$pid = $row[pid];

	$result[$i] = $pid;
	$i++;
    }
    return $result;
}

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function TBExptState($pid, $eid)
{
    $query_result =
	DBQueryFatal("select state from experiments ".
		     "where eid='$eid' and pid='$pid'");

    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    $row   = mysql_fetch_array($query_result);
    $state = $row[state];
    return $state;
}

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function TBUidNodeLastLogin($uid)
{
    $query_result =
	DBQueryFatal("select * from uidnodelastlogin where uid='$uid'");

    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    $row   = mysql_fetch_array($query_result);
    return $row;
}

#
# Return the last login for the node, but only after the experiment was
# created (swapped in).
# 
function TBNodeUidLastLogin($node_id)
{
    $query_result =
	DBQueryFatal("select n.* from nodeuidlastlogin as n ".
		     "left join reserved as r on n.node_id=r.node_id ".
		     "left join experiments as e ".
		     " on r.eid=e.eid and r.pid=e.pid ".
		     "where r.node_id='$node_id' and ".
		     "  DATE_ADD(n.date, INTERVAL n.time HOUR_SECOND) >= ".
		     "           e.expt_swapped");

    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    $row   = mysql_fetch_array($query_result);
    return $row;
}

#
# Return the last login for all of the nodes in an experiment, but only
# after the experiment was created (swapped in).
# 
function TBExpUidLastLogins($pid, $eid)
{
    $query_result =
	DBQueryFatal("select n.* from nodeuidlastlogin as n ".
		     "left join reserved as r on n.node_id=r.node_id ".
		     "left join experiments as e ".
		     " on r.eid=e.eid and r.pid=e.pid ".
		     "where r.pid='$pid' and r.eid='$eid' and ".
		     "  DATE_ADD(n.date, INTERVAL n.time HOUR_SECOND) >= ".
		     "           e.expt_swapped ".
		     "      order by n.date DESC");

    if (mysql_num_rows($query_result) == 0) {
	return 0;
    }
    $row   = mysql_fetch_array($query_result);
    return $row;
}

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#
# DB Interface.
#

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

#
# This mirrors the routine in the PERL code. The point is to avoid
# writing the same thing repeatedly, get consistent error handling,
# and make sure that mail is sent to the testbed list when things go
# wrong!
#
# Argument is a string. Returns the actual query object, so it is up to
# the caller to test it. I would not for one moment view this as
# encapsulation of the DB interface. 
# 
# usage: DBQuery(char *str)
#        returns the query object result.
#
# Sets $DBErrorString is case of error; saving the original query string and
# the error string from the DB module. Use DBFatal (below) to print/email
# that string, and then exit.
#
function DBQuery($query)
{
    global	$TBDBNAME;
    global	$DBErrorString;
    
    $result = mysql_db_query($TBDBNAME, $query);

    if (! $result) {
	$DBErrorString =
	    "  Query: $query\n".
	    "  Error: " . mysql_error();
    }
    return $result;
}

#
# Same as above, but die on error. 
# 
function DBQueryFatal($query)
{
    $result = DBQuery($query);

    if (! $result) {
	DBFatal("DB Query failed");
    }
    return $result;
}

#
# Same as above, but just send email on error. This info is useful
# to the TB system, but the caller has to retain control.
# 
function DBQueryWarn($query)
{
    $result = DBQuery($query);

    if (! $result) {
	DBWarn("DB Query failed");
    }
    return $result;
}

#
# Warn and send email after a failed DB query. First argument is the error
# message to send. The contents of $DBErrorString is also sent. We do not
# print this stuff back to the user since we might leak stuff out that we
# should not.
# 
# usage: DBWarn(char *message)
#
function DBWarn($message)
{
    global	$PHP_SELF, $DBErrorString;
    
    $text = "$message - In $PHP_SELF\n" .
  	    "$DBErrorString\n";

    TBERROR($text, 0);
}

#
# Same as above, but die after the warning.
# 
# usage: DBFatal(char *message);
#
function DBFatal($message)
{
    global $TBMAILADDR;

    DBWarn($message);

    echo "<p><p>
	  Unexpected Error. Could not continue. Please contact $TBMAILADDR\n";

    PAGEFOOTER();
    die("");
}

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?>