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<?php
/**
* @file ogagent.php
* @brief OpenGnsys REST routes for OGAgent communications.
* @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 2016-10-03
*/
// OGAgent sessions log file.
define('LOG_FILE', '/opt/opengnsys/log/ogagent.log');
// Function to write a line into log file.
function writeLog($message = "") {
file_put_contents(LOG_FILE, date(DATE_ISO8601).": $message\n", FILE_APPEND);
}
/**
* @brief OGAgent notifies that its service is started on a client.
* @note Route: /ogagent/started, Method: POST, Format: JSON
* @param string ip IP address
* @param string mac MAC (Ethernet) address
* @param string ostype OS type (Linux, Windows, macOS)
* @param string osversion OS version
* @param string secret random secret key to access client's REST API
* @return Null string if OK, else error message.
*/
$app->post('/ogagent/started',
function() use ($app) {
global $cmd;
$osType = $osVersion = "none";
try {
// Reading POST parameters in JSON format.
$input = json_decode($app->request()->getBody());
$ip = htmlspecialchars($input->ip);
$mac = htmlspecialchars($input->mac);
if (isset($input->ostype)) $osType = htmlspecialchars($input->ostype);
if (isset($input->osversion)) $osVersion = str_replace(",", ";", htmlspecialchars($input->osversion));
// Check sender agent type and IP address consistency (same as parameter value).
if (empty(preg_match('/^python-requests\//', $_SERVER['HTTP_USER_AGENT'])) or $ip !== $_SERVER['REMOTE_ADDR']) {
throw new Exception("Bad OGAgent: ip=$ip, sender=".$_SERVER['REMOTE_ADDR'].", agent=".$_SERVER['HTTP_USER_AGENT']);
}
// Client secret key for secure communications.
if (isset($input->secret)) {
// Check if secret key is valid (32 alphanumeric characters).
if (! ctype_alnum($input->secret) or strlen($input->secret) !== 32) {
throw new Exception("Bad secret key: ip=$ip, mac=$mac, os=$osType:$osVersion.");
}
// Store secret key in DB.
if (isset($input->secret)) $secret = htmlspecialchars($input->secret);
$cmd->texto = <<<EOD
UPDATE ordenadores
SET agentkey='$secret'
WHERE ip='$ip' AND mac=UPPER(REPLACE('$mac', ':', ''))
LIMIT 1;
EOD;
if ($cmd->Ejecutar() !== true or mysqli_affected_rows($cmd->Conexion->controlador) !== 1) {
// DB access error or not updated.
throw new Exception("Cannot store new secret key: ip=$ip, mac=$mac, os=$osType:$osVersion.");
}
} else {
// Insecure agent exception.
throw new Exception("Insecure OGAgent started: ip=$ip, mac=$mac, os=$osType:$osVersion.");
}
// Default processing: log activity.
writeLog("OGAgent started: ip=$ip, mac=$mac, os=$osType:$osVersion.");
// Response.
$response = "";
jsonResponse(200, $response);
} catch (Exception $e) {
// Communication error.
$response["message"] = $e->getMessage();
writeLog($app->request()->getResourceUri().": ERROR: ".$response["message"]);
jsonResponse(400, $response);
}
}
);
/**
* @brief OGAgent notifies that its service is stopped on client.
* @note Route: /ogagent/stopped, Method: POST, Format: JSON
* @param string ip IP address
* @param string mac MAC (Ethernet) address
* @param string ostype OS type (Linux, Windows, macOS)
* @param string osversion OS version
* @return Null string if OK, else error message.
*/
$app->post('/ogagent/stopped',
function() use ($app) {
$osType = $osVersion = "none";
try {
// Reading POST parameters in JSON format.
$input = json_decode($app->request()->getBody());
$ip = htmlspecialchars($input->ip);
$mac = htmlspecialchars($input->mac);
if (isset($input->ostype)) $osType = htmlspecialchars($input->ostype);
if (isset($input->osversion)) $osVersion = str_replace(",", ";", htmlspecialchars($input->osversion));
// Check sender agent type and IP address consistency (same as parameter value).
if (empty(preg_match('/^python-requests\//', $_SERVER['HTTP_USER_AGENT'])) or $ip !== $_SERVER['REMOTE_ADDR']) {
throw new Exception("Bad OGAgent: ip=$ip, sender=".$_SERVER['REMOTE_ADDR'].", agent=".$_SERVER['HTTP_USER_AGENT']);
}
// May check if client is included in the server database?
// Default processing: log activity.
writeLog("OGAgent stopped: ip=$ip, mac=$mac, os=$osType:$osVersion.");
// Response.
$response = "";
jsonResponse(200, $response);
} catch (Exception $e) {
// Communication error.
$response["message"] = $e->getMessage();
writeLog($app->request()->getResourceUri().": ERROR: ".$response["message"]);
jsonResponse(400, $response);
}
}
);
/**
* @brief OGAgent notifies that an user logs in.
* @note Route: /ogagent/loggedin, Method: POST, Format: JSON
* @param string ip IP address
* @param string user username
* @param string language session language
* @param string ostype OS type (Linux, Windows, macOS)
* @param string osversion OS version
* @return Null string if OK, else error message.
*/
$app->post('/ogagent/loggedin',
function() use ($app) {
global $cmd;
$redirto = Array();
$result = Array();
try {
// Reading POST parameters in JSON format.
$input = json_decode($app->request()->getBody());
$ip = htmlspecialchars($input->ip);
$user = htmlspecialchars($input->user);
$language = isset($input->language) ? substr($input->language, 0, strpos($input->language, "_")) : "";
if (isset($input->ostype)) $osType = htmlspecialchars($input->ostype);
if (isset($input->osversion)) $osVersion = str_replace(",", ";", htmlspecialchars($input->osversion));
// Check sender IP address consistency (same as parameter value).
if (empty(preg_match('/^python-requests\//', $_SERVER['HTTP_USER_AGENT'])) or $ip !== $_SERVER['REMOTE_ADDR']) {
throw new Exception("Bad OGAgent: ip=$ip, sender=".$_SERVER['REMOTE_ADDR'].", agent=".$_SERVER['HTTP_USER_AGENT']);
}
// Check if client is included in the server database.
$cmd->CreaParametro("@ip", $ip, 0);
$cmd->texto = <<<EOD
SELECT ordenadores.idordenador, ordenadores.nombreordenador, remotepc.urllogin,
remotepc.reserved > NOW() AS reserved
FROM remotepc
RIGHT JOIN ordenadores ON remotepc.id=ordenadores.idordenador
WHERE ordenadores.ip=@ip
LIMIT 1;
EOD;
$rs=new Recordset;
$rs->Comando=&$cmd;
if ($rs->Abrir()) {
// Read query data.
$rs->Primero();
$id = $rs->campos['idordenador'];
$redirto[0]['url'] = $rs->campos['urllogin'];
$reserved = $rs->campos['reserved'];
$rs->Cerrar();
if (!is_null($id)) {
// Log activity, respond to client and continue processing.
writeLog("User logged in: ip=$ip, user=$user, lang=$language, os=$osType:$osVersion.");
$response = "";
jsonResponseNow(200, $response);
} else {
throw new Exception("Client is not in the database: ip=$ip, user=$user");
}
// Redirect notification to UDS server, if needed.
if ($reserved == 1 and !is_null($redirto[0]['url'])) {
$redirto[0]['get'] = $app->request()->getBody();
$result = multiRequest($redirto);
// ... (check response)
//if ($result[0]['code'] != 200) {
// ...
// Updating user's session language for messages.
$cmd->texto = <<<EOD
UPDATE remotepc
SET language = '$language'
WHERE id = '$id';
EOD;
$cmd->Ejecutar();
}
} else {
throw new Exception("Database error");
}
} catch (Exception $e) {
// Communication error.
$response["message"] = $e->getMessage();
writeLog($app->request()->getResourceUri().": ERROR: ".$response["message"]);
jsonResponse(400, $response);
}
}
);
/**
* @brief OGAgent notifies that an user logs out.
* @note Route: /ogagent/loggedout, Method: POST, Format: JSON
* @param string ip IP address
* @param string user username
* @return Null string if OK, else error message.
*/
$app->post('/ogagent/loggedout',
function() use ($app) {
global $cmd;
$redirto = Array();
$result = Array();
try {
// Reading POST parameters in JSON format.
$input = json_decode($app->request()->getBody());
$ip = htmlspecialchars($input->ip);
$user = htmlspecialchars($input->user);
// Check sender agent type and IP address consistency (same as parameter value).
if (empty(preg_match('/^python-requests\//', $_SERVER['HTTP_USER_AGENT'])) or $ip !== $_SERVER['REMOTE_ADDR']) {
throw new Exception("Bad OGAgent: ip=$ip, sender=".$_SERVER['REMOTE_ADDR'].", agent=".$_SERVER['HTTP_USER_AGENT']);
}
// Check if client is included in the server database.
$cmd->CreaParametro("@ip", $ip, 0);
$cmd->texto = <<<EOD
SELECT ordenadores.idordenador, ordenadores.nombreordenador, remotepc.urllogout,
remotepc.reserved > NOW() AS reserved
FROM remotepc
RIGHT JOIN ordenadores ON remotepc.id=ordenadores.idordenador
WHERE ordenadores.ip=@ip
LIMIT 1;
EOD;
$rs=new Recordset;
$rs->Comando=&$cmd;
if ($rs->Abrir()) {
// Read query data.
$rs->Primero();
$id = $rs->campos['idordenador'];
$redirto[0]['url'] = $rs->campos['urllogout'];
$reserved = $rs->campos['reserved'];
$rs->Cerrar();
if (!is_null($id)) {
// Log activity, respond to client and continue processing.
writeLog("User logged out: ip=$ip, user=$user.");
$response = "";
jsonResponseNow(200, $response);
} else {
throw new Exception("Client is not in the database: ip=$ip, user=$user");
}
// Redirect notification to UDS server, if needed.
if ($reserved == 1 and !is_null($redirto[0]['url'])) {
$redirto[0]['get'] = $app->request()->getBody();
$result = multiRequest($redirto);
// ... (check response)
//if ($result[0]['code'] != 200) {
// ...
}
} else {
throw new Exception("Database error");
}
} catch (Exception $e) {
// Communication error.
$response["message"] = $e->getMessage();
writeLog($app->request()->getResourceUri().": ERROR: ".$response["message"]);
jsonResponse(400, $response);
}
}
);
?>
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