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<?php
/**
* @file remotepc.php
* @brief OpenGnsys Server REST API consumed by UDS Server for Remote PC implementation.
* @warning All input and output messages are formatted in JSON.
* @note Some ideas are based on article "How to create REST API for Android app using PHP, Slim and MySQL" by Ravi Tamada, thanx.
* @license GNU GPLv3+
* @author Ramón M. Gómez, ETSII Univ. Sevilla
* @version 1.1.0 - First version
* @date 2017-02-01
*/
// OGAgent sessions log file.
define('REMOTEPC_LOGFILE', '/opt/opengnsys/log/remotepc.log');
// Function to write a line into log file.
function writeRemotepcLog($message = "") {
file_put_contents(REMOTEPC_LOGFILE, date(DATE_ISO8601).": $message\n", FILE_APPEND);
}
// REST routes.
/**
* @brief Reserve a client with an installed image and the older reservation time, then send a boot/reboot operation depending on its status.
* @warning If "lab" parameter is specified, then choose a client from this lab.
* @note Route: /ous/:ouid/images/:imageid/reserve, Method: POST
* @param integer ouid OU identificator
* @param integer imageid image identificator
* @note Input JSON message: {"labid":int_labid,"maxtime":int_hours}
*/
$app->post('/ous/:ouid/images/:imageid/reserve(/)', 'validateApiKey',
function($ouid, $imageid) use ($app) {
global $cmd;
global $AMBITO_ORDENADORES;
global $EJECUCION_COMANDO;
global $ACCION_INICIADA;
global $ACCION_FINALIZADA;
global $ACCION_SINRESULTADO;
global $ACCION_FALLIDA;
global $userid;
$response = Array();
$ogagent = Array();
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": Init.");
// Checking parameters.
try {
if (empty(preg_match('/^python-requests\//', $_SERVER['HTTP_USER_AGENT']))) {
throw new Exception("Bad agent: sender=".$_SERVER['REMOTE_ADDR'].", agent=".$_SERVER['HTTP_USER_AGENT']);
}
if (!checkIds($ouid, $imageid)) {
throw new Exception("Ids. must be positive integers");
}
// Reading POST parameters in JSON format.
$input = json_decode($app->request()->getBody());
// Default: no lab. filter.
if (isset($input->labid)) {
$labid = $input->labid != "0" ? $input->labid : '%';
} else {
$labid = '%';
}
$maxtime = isset($input->maxtime) ? $input->maxtime : 24; // Default: 24 h.
$opts = Array('options' => Array('min_range' => 1)); // Check for int>0
if (filter_var($labid, FILTER_VALIDATE_INT, $opts) === false and $labid !== '%') {
throw new Exception("Lab id. must be positive integer");
}
if (filter_var($maxtime, FILTER_VALIDATE_INT, $opts) === false) {
throw new Exception("Time must be positive integer (in hours)");
}
} catch (Exception $e) {
// Communication error.
$response["message"] = $e->getMessage();
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": ERROR: ".$response["message"].".");
jsonResponse(400, $response);
$app->stop();
}
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": Parameters: labid=$labid, maxtime=$maxtime");
// Choose older not-reserved client with image installed and get ogAdmServer data.
$cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, entornos.ipserveradm, entornos.portserveradm,
ordenadores.idordenador, ordenadores.nombreordenador, ordenadores.ip,
ordenadores.mac, ordenadores.agentkey, ordenadores_particiones.numdisk,
ordenadores_particiones.numpar, aulas.idaula, aulas.idcentro
FROM entornos, ordenadores
JOIN aulas USING(idaula)
RIGHT JOIN administradores_centros AS adm USING(idcentro)
RIGHT JOIN usuarios USING(idusuario)
RIGHT JOIN ordenadores_particiones USING(idordenador)
RIGHT JOIN imagenes USING(idimagen)
LEFT JOIN remotepc ON remotepc.id=ordenadores.idordenador
WHERE adm.idadministradorcentro = '$userid'
AND aulas.idcentro = '$ouid' AND aulas.idaula LIKE '$labid' AND aulas.inremotepc = 1
AND imagenes.idimagen = '$imageid' AND imagenes.inremotepc = 1
AND (remotepc.reserved < NOW() OR ISNULL(reserved))
ORDER BY remotepc.reserved ASC LIMIT 1;
EOD;
$rs=new Recordset;
$rs->Comando=&$cmd;
if (!$rs->Abrir()) return(false); // Error opening recordset.
// Check if user is admin and client exists.
$rs->Primero();
if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["idordenador"])) {
// Read query data.
$serverip = $rs->campos["ipserveradm"];
$serverport = $rs->campos["portserveradm"];
$clntid = $rs->campos["idordenador"];
$clntname = $rs->campos["nombreordenador"];
$clntip = $rs->campos["ip"];
$clntmac = $rs->campos["mac"];
$agentkey = $rs->campos["agentkey"];
$disk = $rs->campos["numdisk"];
$part = $rs->campos["numpar"];
$labid = $rs->campos["idaula"];
$ouid = $rs->campos["idcentro"];
// Check client's status.
$ogagent[$clntip]['url'] = "https://$clntip:8000/opengnsys/status";
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": OGAgent status, url=".$ogagent[$clntip]['url'].".");
$result = multiRequest($ogagent);
if (empty($result[$clntip]['data'])) {
// Client is off, send a boot command to ogAdmServer.
// TODO: if client is busy?????
$reqframe = "nfn=Arrancar\r".
"ido=$clntid\r".
"iph=$clntip\r".
"mac=$clntmac\r".
"mar=1\r";
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). "Send Boot command to ogAdmClient, ido=$clntid,iph=$clntip,mac=$clntmac.");
sendCommand($serverip, $serverport, $reqframe, $values);
} else {
// Client is on, send a rieboot command to its OGAgent.
$ogagent[$clntip]['url'] = "https://$clntip:8000/opengnsys/reboot";
$ogagent[$clntip]['header'] = Array("Authorization: ".$agentkey);
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": OGAgent reboot, url=".$ogagent[$clntip]['url'].".");
$result = multiRequest($ogagent);
// ... (check response)
//if ($result[$clntip]['code'] != 200) {
// ...
}
// DB Transaction: mark choosed client as reserved and
// create an init session command into client's actions queue.
$cmd->texto = "START TRANSACTION;";
$cmd->Ejecutar();
$timestamp = time();
$cmd->texto = <<<EOD
INSERT INTO remotepc
SET id='$clntid', reserved=NOW() + INTERVAL $maxtime HOUR, urllogin=NULL, urllogout=NULL
ON DUPLICATE KEY UPDATE
id=VALUES(id), reserved=VALUES(reserved),
urllogin=VALUES(urllogin), urllogout=VALUES(urllogout);
EOD;
$t1 = $cmd->Ejecutar();
$cmd->texto = <<<EOD
INSERT INTO acciones
SET tipoaccion=$EJECUCION_COMANDO,
idtipoaccion=9,
idcomando=9,
parametros='nfn=IniciarSesion\rdsk=$disk\rpar=$part',
descriaccion='RemotePC Session',
idordenador=$clntid,
ip='$clntip',
sesion=$timestamp,
fechahorareg=NOW(),
estado=$ACCION_INICIADA,
resultado=$ACCION_SINRESULTADO,
ambito=$AMBITO_ORDENADORES,
idambito=$clntid,
restrambito='$clntip',
idcentro=$ouid;
EOD;
$t2 = $cmd->Ejecutar();
// Create event to remove reservation on timeout (15 min.).
$timeout = "15 MINUTE";
$cmd->texto = <<<EOD
CREATE EVENT e_timeout_$clntid
ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL $timeout DO
BEGIN
SET @clntid = NULL;
UPDATE acciones
SET estado = $ACCION_FINALIZADA, resultado = $ACCION_FALLIDA,
descrinotificacion = 'Timeout'
WHERE descriaccion = 'RemotePC Session' AND estado = $ACCION_INICIADA
AND idordenador = (SELECT @clntid := '$clntid');
IF @clntid IS NOT NULL THEN
UPDATE remotepc
SET reserved=NOW() - INTERVAL 1 SECOND, urllogin=NULL, urllogout=NULL
WHERE id = @clntid;
DELETE FROM acciones
WHERE idordenador = @clntid
AND descriaccion = 'RemotePC Session'
AND descrinotificacion = 'Timeout';
END IF;
END
EOD;
$t3 = $cmd->Ejecutar();
if ($t1 and $t2 and $t3) {
// Commit transaction on success.
$cmd->texto = "COMMIT;";
$cmd->Ejecutar();
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": DB tables and events updated, clntid=$clntid.");
// Send init session command if client is booted on ogLive.
$reqframe = "nfn=IniciarSesion\r".
"ido=$clntid\r".
"iph=$clntip\r".
"dsk=$disk\r".
"par=$part\r";
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": Send Init Session command to ogAdmClient, ido=$clntid,iph=$clntip,dsk=$disk,par=$part.");
sendCommand($serverip, $serverport, $reqframe, $values);
// Compose JSON response.
$response['id'] = (int)$clntid;
$response['name'] = $clntname;
$response['ip'] = $clntip;
$response['mac'] = $clntmac;
$response['lab']['id'] = $labid;
$response['ou']['id'] = (int)$ouid;
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": Response, ".var_export($response,true).".");
jsonResponse(200, $response);
} else {
// Roll-back transaction on DB error.
$cmd->texto = "ROLLBACK;";
$cmd->Ejecutar();
// Error message.
$response["message"] = "Database error: $t1, $t2, $t3";
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": ERROR: ".$response["message"].".");
jsonResponse(400, $response);
}
} else {
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": UNASSIGNED");
}
$rs->Cerrar();
$app->stop();
}
);
/**
* @brief Store UDS server URLs to resend some events recieved from OGAgent.
* @note Route: /ous/:ouid/labs/:labid/clients/:clntid/events, Method: POST
* @param string urlLogin URL to redirect login notification.
* @param string urlLogout URL to redirect logout notification.
* @warning Events parameters will be stored in a new "remotepc" table.
*/
$app->post('/ous/:ouid/labs/:labid/clients/:clntid/events', 'validateApiKey',
function($ouid, $labid, $clntid) use ($app) {
global $cmd;
global $userid;
$response = Array();
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": Init.");
// Checking parameters.
try {
if (empty(preg_match('/^python-requests\//', $_SERVER['HTTP_USER_AGENT']))) {
throw new Exception("Bad agent: sender=".$_SERVER['REMOTE_ADDR'].", agent=".$_SERVER['HTTP_USER_AGENT']);
}
if (!checkIds($ouid, $labid, $clntid)) {
throw new Exception("Ids. must be positive integers");
}
// Reading JSON parameters.
$input = json_decode($app->request()->getBody());
$urlLogin = htmlspecialchars($input->urlLogin);
$urlLogout = htmlspecialchars($input->urlLogout);
if (filter_var($urlLogin, FILTER_VALIDATE_URL) === false) {
throw new Exception("Must be a valid URL for login notification");
}
if (filter_var($urlLogout, FILTER_VALIDATE_URL) === false) {
throw new Exception("Must be a valid URL for logout notification");
}
} catch (Exception $e) {
// Error message.
$response["message"] = $e->getMessage();
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": ERROR: ".$response["message"].".");
jsonResponse(400, $response);
$app->stop();
}
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": Parameters: urlLogin=$urlLogin, urlLogout=$urlLogout");
// Select client data for UDS compatibility.
$cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, ordenadores.idordenador, remotepc.*
FROM remotepc
RIGHT JOIN ordenadores ON remotepc.id=ordenadores.idordenador
JOIN aulas USING(idaula)
RIGHT JOIN administradores_centros AS adm USING(idcentro)
RIGHT JOIN usuarios USING(idusuario)
WHERE adm.idadministradorcentro = '$userid'
AND idcentro = '$ouid' AND aulas.idaula ='$labid'
AND ordenadores.idordenador = '$clntid';
EOD;
$rs=new Recordset;
$rs->Comando=&$cmd;
if (!$rs->Abrir()) return(false); // Error opening recordset.
// Check if user is admin and client exists.
$rs->Primero();
if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["idordenador"])) {
// Check if client is reserved.
if (! is_null($rs->campos["reserved"])) {
// Updating DB if client is reserved.
$cmd->CreaParametro("@urllogin", $urlLogin, 0);
$cmd->CreaParametro("@urllogout", $urlLogout, 0);
$cmd->texto = <<<EOD
UPDATE remotepc
SET urllogin=@urllogin, urllogout=@urllogout
WHERE id='$clntid';
EOD;
if ($cmd->Ejecutar()) {
// Confirm operation.
$response = "";
jsonResponse(200, $response);
} else {
// Error message.
$response["message"] = "Database error";
jsonResponse(400, $response);
}
} else {
// Error message.
$response["message"] = "Client is not reserved";
jsonResponse(400, $response);
}
}
$rs->Cerrar();
$app->stop();
}
);
/*
* @brief Store session time (in sec).
* @note Route: /ous/:ouid/labs/:labid/clients/:clntid/session, Method: POST
* @param int deadLine maximum time session (in seconds)
* @warning Parameters will be stored in a new "remotepc" table.
*/
$app->post('/ous/:ouid/labs/:labid/clients/:clntid/session', 'validateApiKey',
function($ouid, $labid, $clntid) use ($app) {
global $cmd;
global $userid;
$response = Array();
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": Init.");
// Checking parameters.
try {
if (empty(preg_match('/^python-requests\//', $_SERVER['HTTP_USER_AGENT']))) {
throw new Exception("Bad agent: sender=".$_SERVER['REMOTE_ADDR'].", agent=".$_SERVER['HTTP_USER_AGENT']);
}
if (!checkIds($ouid, $labid, $clntid)) {
throw new Exception("Ids. must be positive integers");
}
// Reading JSON parameters.
$input = json_decode($app->request()->getBody());
$deadLine = $input->deadLine;
if (filter_var($deadLine, FILTER_VALIDATE_INT) === false) {
throw new Exception("Deadline must be integer");
}
if ($deadLine <= 0) {
throw new Exception("Resource unavailable");
}
} catch (Exception $e) {
// Error message.
$response["message"] = $e->getMessage();
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": ERROR: ".$response["message"].".");
jsonResponse(400, $response);
$app->stop();
}
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": Parameters: deadLine=$deadLine");
// Get client's data.
$cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, ordenadores.idordenador, remotepc.*
FROM remotepc
RIGHT JOIN ordenadores ON remotepc.id=ordenadores.idordenador
JOIN aulas USING(idaula)
RIGHT JOIN administradores_centros AS adm USING(idcentro)
WHERE adm.idadministradorcentro = '$userid'
AND aulas.idcentro = '$ouid' AND aulas.idaula = '$labid'
AND ordenadores.idordenador = '$clntid';
EOD;
$rs=new Recordset;
$rs->Comando=&$cmd;
if (!$rs->Abrir()) return(false); // Error opening recordset.
// Check if user is admin and client exists.
$rs->Primero();
if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["idordenador"])) {
// Check if client is reserved.
if (! is_null($rs->campos["urllogin"])) {
// Read query data.
$clntid = $rs->campos["idordenador"];
# Removing previous commands from OGAgent operations queue.
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": Updating database.");
$cmd->texto = <<<EOD
DELETE FROM ogagent_queue
WHERE clientid = '$clntid' AND operation IN ('popup-10', 'popup-5', 'poweroff');
EOD;
$cmd->Ejecutar();
# Add new commands to OGAgent operations queue.
$cmd->texto = "INSERT INTO ogagent_queue (clientid, exectime, operation) VALUES";
if ($deadLine > 600) {
# Add reminder 10 min. before deadline.
$cmd->texto .= " ($clntid, NOW() + INTERVAL $deadLine SECOND - INTERVAL 10 MINUTE, 'popup-10'),";
}
if ($deadLine > 300) {
# Add reminder 5 min. before deadline.
$cmd->texto .= " ($clntid, NOW() + INTERVAL $deadLine SECOND - INTERVAL 5 MINUTE, 'popup-5'),";
}
# Add power off command at deadline time.
$cmd->texto .= " ($clntid, NOW() + INTERVAL $deadLine SECOND, 'poweroff');";
if ($cmd->Ejecutar()) {
// Confirm operation.
$response = "";
jsonResponse(200, $response);
} else {
// Error message.
$response["message"] = "Database error";
jsonResponse(400, $response);
}
} else {
// Error message.
$response["message"] = "Client is not reserved";
jsonResponse(400, $response);
}
} else {
// Error message.
$response["message"] = "Client does not exist";
jsonResponse(404, $response);
}
$rs->Cerrar();
}
);
/**
* @brief Store UDS server URLs to resend some events recieved from OGAgent.
* @brief Unreserve a client and send a poweroff operation.
* @note Route: /ous/:ouid/labs/:labid/clients/:clntid/unreserve, Method: DELETE
*/
$app->delete('/ous/:ouid/labs/:labid/clients/:clntid/unreserve', 'validateApiKey',
function($ouid, $labid, $clntid) use ($app) {
global $cmd;
global $userid;
global $ACCION_INICIADA;
$response = Array();
$ogagent = Array();
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": Init.");
// Checking parameters.
try {
if (empty(preg_match('/^python-requests\//', $_SERVER['HTTP_USER_AGENT']))) {
throw new Exception("Bad agent: sender=".$_SERVER['REMOTE_ADDR'].", agent=".$_SERVER['HTTP_USER_AGENT']);
}
if (!checkIds($ouid, $labid, $clntid)) {
throw new Exception("Ids. must be positive integers");
}
} catch (Exception $e) {
// Error message.
$response["message"] = $e->getMessage();
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": ERROR: ".$response["message"].".");
jsonResponse(400, $response);
$app->stop();
}
// Select client data for UDS compatibility.
$cmd->texto = <<<EOD
SELECT adm.idadministradorcentro, ordenadores.idordenador, ordenadores.ip, ordenadores.agentkey, remotepc.reserved
FROM remotepc
RIGHT JOIN ordenadores ON remotepc.id=ordenadores.idordenador
JOIN aulas USING(idaula)
RIGHT JOIN administradores_centros AS adm USING(idcentro)
RIGHT JOIN usuarios USING(idusuario)
WHERE adm.idadministradorcentro = '$userid'
AND idcentro = '$ouid' AND aulas.idaula ='$labid'
AND ordenadores.idordenador = '$clntid';
EOD;
$rs=new Recordset;
$rs->Comando=&$cmd;
if (!$rs->Abrir()) return(false); // Error opening recordset.
// Check if user is admin and client exists.
$rs->Primero();
if (checkAdmin($rs->campos["idadministradorcentro"]) and checkParameter($rs->campos["idordenador"])) {
// Check if client is reserved.
if (! is_null($rs->campos["reserved"])) {
// Read query data.
$clntip = $rs->campos["ip"];
$agentkey = $rs->campos["agentkey"];
// DB Transaction: set reservation time to the past and
// remove pending boot commands from client's and agent's queues.
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": Updating database.");
$cmd->texto = "START TRANSACTION;";
$cmd->Ejecutar();
$cmd->texto = <<<EOD
UPDATE remotepc
SET reserved=NOW() - INTERVAL 1 SECOND, urllogin=NULL, urllogout=NULL
WHERE id='$clntid';
EOD;
$cmd->Ejecutar();
$cmd->texto = <<<EOD
DELETE FROM acciones
WHERE idordenador = '$clntid'
AND descriaccion = 'RemotePC Session';
EOD;
$cmd->Ejecutar();
$cmd->texto = <<<EOD
DELETE FROM ogagent_queue
WHERE clientid = '$clntid' AND command IN ('popup-10', 'popup-5', 'poweroff');
EOD;
$cmd->Ejecutar();
$cmd->texto = "COMMIT;";
$cmd->Ejecutar();
// Send a poweroff command to client's OGAgent.
$ogagent[$clntip]['url'] = "https://$clntip:8000/opengnsys/poweroff";
$ogagent[$clntip]['header'] = Array("Authorization: ".$agentkey);
if ($app->settings['debug'])
writeRemotepcLog($app->request()->getResourceUri(). ": OGAgent poweroff, url=".$ogagent[$clntip]['url'].".");
$result = multiRequest($ogagent);
// ... (check response)
//if ($result[$clntip]['code'] != 200) {
// ...
// Confirm operation.
$response = "";
jsonResponse(200, $response);
} else {
// Error message.
$response["message"] = "Client is not reserved";
jsonResponse(400, $response);
}
} else {
// Error message.
$response["message"] = "Client does not exist";
jsonResponse(404, $response);
}
$rs->Cerrar();
}
);
?>
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