#include <fcgi_stdio.h>
#include <openssl/sha.h>
-#include "fastcgi.h"
+#include <time.h>
+
#include "common.h"
+#include "fastcgi.h"
#include "sensor.h"
#include "log.h"
-#include <time.h>
-static void LoginHandler(void *data, char *params) {
- static char loginkey[41] = {0}, ip[256];
- static time_t timestamp = 0;
+#define LOGIN_TIMEOUT 180
+
+struct FCGIContext {
+ /**The time of last valid logged-in user access*/
+ time_t login_timestamp;
+ char login_key[41];
+ char login_ip[16];
+ /**The name of the current module**/
+ const char *current_module;
+ /**For debugging purposes?**/
+ int response_number;
+};
+
+/**
+ * Handles user logins.
+ * @param context The context to work in
+ * @param params User specified parameters
+ */
+static void LoginHandler(FCGIContext *context, char *params) {
const char *key, *value;
- int force = 0, end = 0;
+ bool force = 0, end = 0;
while ((params = FCGI_KeyPair(params, &key, &value))) {
if (!strcmp(key, "force"))
}
if (end) {
- *loginkey = 0;
- FCGI_BeginJSON(200, "login");
+ *(context->login_key) = 0;
+ FCGI_BeginJSON(context, STATUS_OK);
FCGI_EndJSON();
return;
}
time_t now = time(NULL);
- if (force || !*loginkey || (now - timestamp > 180)) {
+ if (force || !*(context->login_key) ||
+ (now - context->login_timestamp > LOGIN_TIMEOUT))
+ {
SHA_CTX sha1ctx;
unsigned char sha1[20];
int i = rand();
SHA1_Update(&sha1ctx, &i, sizeof(i));
SHA1_Final(sha1, &sha1ctx);
- timestamp = now;
+ context->login_timestamp = now;
for (i = 0; i < 20; i++)
- sprintf(loginkey+i*2, "%02x", sha1[i]);
- sprintf(ip, "%s", getenv("REMOTE_ADDR"));
- FCGI_BeginJSON(200, "login");
- FCGI_BuildJSON("key", loginkey);
+ sprintf(context->login_key + i * 2, "%02x", sha1[i]);
+ snprintf(context->login_ip, 16, "%s", getenv("REMOTE_ADDR"));
+ FCGI_BeginJSON(context, STATUS_OK);
+ FCGI_JSONPair("key", context->login_key);
FCGI_EndJSON();
} else {
char buf[128];
- strftime(buf, 128, "%H:%M:%S %d-%m-%Y",localtime(×tamp));
- FCGI_BeginJSON(401, "login");
- FCGI_BuildJSON("description", "Already logged in");
- FCGI_BuildJSON("user", ip);
- FCGI_BuildJSON("time", buf);
+ strftime(buf, 128, "%H:%M:%S %d-%m-%Y",
+ localtime(&(context->login_timestamp)));
+ FCGI_BeginJSON(context, STATUS_UNAUTHORIZED);
+ FCGI_JSONPair("description", "Already logged in");
+ FCGI_JSONPair("user", context->login_ip);
+ FCGI_JSONPair("time", buf);
FCGI_EndJSON();
}
}
-/**
- * Handle a request to the sensor module
- * @param data - Data to pass to module (?)
- * @param params - Parameters passed
- */
-static void SensorHandler(void * data, char * params)
-{
- static DataPoint buffer[SENSOR_QUERYBUFSIZ];
- StatusCodes status = STATUS_OK;
- const char * key; const char * value;
-
- int sensor_id = SENSOR_NONE;
-
- do
- {
- params = FCGI_KeyPair(params, &key, &value);
- Log(LOGDEBUG, "Got key=%s and value=%s", key, value);
- if (strcmp(key, "id") == 0)
- {
- if (sensor_id != SENSOR_NONE)
- {
- Log(LOGERR, "Only one sensor id should be specified");
- status = STATUS_BADREQUEST;
- break;
- }
- //TODO: Use human readable sensor identifier string for API?
- sensor_id = atoi(value);
- if (sensor_id == 0 && strcmp(value, "0") != 0)
- {
- Log(LOGERR, "Sensor id not an integer; %s", value);
- status = STATUS_BADREQUEST;
- break;
- }
+/*TODO: Remove and replace with the actual actuator code*/
+static void ActuatorHandler(FCGIContext *context, char *params) {
+ const char *key, *value, *loginkey = NULL;
+ while ((params = FCGI_KeyPair(params, &key, &value))) {
+ if (!strcmp(key, "key")) {
+ loginkey = value;
}
- else
- {
- Log(LOGERR, "Unknown key \"%s\" (value = %s)", key, value);
- status = STATUS_BADREQUEST;
- break;
- }
}
- while (params != NULL && *params != '\0');
-
- if (sensor_id == SENSOR_NONE)
- {
- Log(LOGERR, "No sensor id specified");
- status = STATUS_BADREQUEST;
- }
- if (sensor_id >= NUMSENSORS || sensor_id < 0)
- {
- Log(LOGERR, "Invalid sensor id %d", sensor_id);
- status = STATUS_BADREQUEST;
+ if (!loginkey || !FCGI_Authorized(context, loginkey)) {
+ FCGI_BeginJSON(context, STATUS_UNAUTHORIZED);
+ FCGI_JSONPair("description", "Invalid key specified.");
+ FCGI_EndJSON();
+ } else {
+ FCGI_BeginJSON(context, STATUS_OK);
+ FCGI_JSONPair("description", "Logged in!");
+ FCGI_EndJSON();
}
+}
- FCGI_BeginJSON(status, "sensor");
-
- if (status != STATUS_BADREQUEST)
- {
- FCGI_BuildJSON(key, value); // should spit back sensor ID
- //Log(LOGDEBUG, "Call Sensor_Query...");
- int amount_read = Sensor_Query(&(g_sensors[sensor_id]), buffer, SENSOR_QUERYBUFSIZ);
- //Log(LOGDEBUG, "Read %d DataPoints", amount_read);
- //Log(LOGDEBUG, "Produce JSON response");
- printf(",\r\n\t\"data\" : [");
- for (int i = 0; i < amount_read; ++i)
- {
- printf("[%f,%f]", buffer[i].time, buffer[i].value);
- if (i+1 < amount_read)
- printf(",");
- }
- printf("]");
- //Log(LOGDEBUG, "Done producing JSON response");
+/**
+ * Given an FCGIContext, determines if the current user (as specified by
+ * the key) is authorized or not. If validated, the context login_timestamp is
+ * updated.
+ * @param context The context to work in
+ * @param key The login key to be validated.
+ * @return TRUE if authorized, FALSE if not.
+ */
+bool FCGI_Authorized(FCGIContext *context, const char *key) {
+ time_t now = time(NULL);
+ int result = (now - context->login_timestamp) <= LOGIN_TIMEOUT &&
+ !strcmp(context->login_key, key);
+ if (result) {
+ context->login_timestamp = now; //Update the login_timestamp
}
- FCGI_EndJSON();
-
+ return result;
}
/**
/**
* Begins a response to the client in JSON format.
- * @param status_code The HTTP status code to be returned.
- * @param module The name of the module that initiated the response.
+ * @param context The context to work in.
+ * @param status_code The status code to be returned.
*/
-void FCGI_BeginJSON(StatusCodes status_code, const char *module)
+void FCGI_BeginJSON(FCGIContext *context, StatusCodes status_code)
{
- switch (status_code) {
- case STATUS_OK:
- break;
- case STATUS_UNAUTHORIZED:
- printf("Status: 401 Unauthorized\r\n");
- break;
- default:
- printf("Status: 400 Bad Request\r\n");
- }
printf("Content-type: application/json; charset=utf-8\r\n\r\n");
printf("{\r\n");
- printf("\t\"module\" : \"%s\"", module);
+ printf("\t\"module\" : \"%s\"", context->current_module);
+ FCGI_JSONLong("status", status_code);
}
/**
* @param key The key of the JSON entry
* ¶m value The value associated with the key.
*/
-void FCGI_BuildJSON(const char *key, const char *value)
+void FCGI_JSONPair(const char *key, const char *value)
{
printf(",\r\n\t\"%s\" : \"%s\"", key, value);
}
+/**
+ * Similar to FCGI_JSONPair except for signed integer values.
+ * @param key The key of the JSON entry
+ * @param value The value associated with the key
+ */
+void FCGI_JSONLong(const char *key, long value)
+{
+ printf(",\r\n\t\"%s\" : %ld", key, value);
+}
+
+/**
+ * Similar to FCGI_JsonPair except for floating point values.
+ * @param key The key of the JSON entry
+ * @param value The value associated with the key
+ */
+void FCGI_JSONDouble(const char *key, double value)
+{
+ printf(",\r\n\t\"%s\" : %f", key, value);
+}
+
+/**
+ * Begins a JSON entry by writing the key. To be used in conjunction
+ * with FCGI_JsonValue.
+ * @param key The key of the JSON entry
+ */
+void FCGI_JSONKey(const char *key)
+{
+ printf(",\r\n\t\"%s\" : ", key);
+}
+
+/**
+ * Should be used to write out the value of a JSON key. This has
+ * the same format as the printf functions. Care should be taken to format
+ * the output in valid JSON.
+ */
+void FCGI_JSONValue(const char *format, ...)
+{
+ va_list list;
+ va_start(list, format);
+ vprintf(format, list);
+ va_end(list);
+}
+
/**
* Ends a JSON response that was initiated by FCGI_BeginJSON.
*/
printf("\r\n}\r\n");
}
+/**
+ * To be used when the input parameters are invalid.
+ * Sends a response with HTTP status 400 Bad request, along with
+ * JSON data for debugging.
+ * @param context The context to work in
+ * @param params The parameters that the module handler received.
+ */
+void FCGI_RejectJSON(FCGIContext *context)
+{
+ printf("Status: 400 Bad Request\r\n");
+
+ FCGI_BeginJSON(context, STATUS_ERROR);
+ FCGI_JSONPair("description", "Invalid request");
+ FCGI_JSONLong("responsenumber", context->response_number);
+ FCGI_JSONPair("params", getenv("DOCUMENT_URI_LOCAL"));
+ FCGI_JSONPair("host", getenv("SERVER_HOSTNAME"));
+ FCGI_JSONPair("user", getenv("REMOTE_USER"));
+ FCGI_JSONPair("ip", getenv("REMOTE_ADDR"));
+ FCGI_EndJSON();
+}
+
/**
* Main FCGI request loop that receives/responds to client requests.
- * @param data A data field to be passed to the selected module handler.
+ * @param data Reserved.
*/
-void FCGI_RequestLoop (void * data)
+void FCGI_RequestLoop (void *data)
{
- int count = 0;
- while (FCGI_Accept() >= 0) {
+ FCGIContext context = {0};
+
+ while (FCGI_Accept() >= 0) {
ModuleHandler module_handler = NULL;
char module[BUFSIZ], params[BUFSIZ];
-
+
//strncpy doesn't zero-truncate properly
snprintf(module, BUFSIZ, "%s", getenv("DOCUMENT_URI_LOCAL"));
snprintf(params, BUFSIZ, "%s", getenv("QUERY_STRING"));
module[lastchar] = 0;
- if (!strcmp("sensors", module)) {
- module_handler = SensorHandler;
- } else if (!strcmp("login", module)) {
+ if (!strcmp("login", module)) {
module_handler = LoginHandler;
+ } else if (!strcmp("sensors", module)) {
+ module_handler = Sensor_Handler;
} else if (!strcmp("actuators", module)) {
-
+ module_handler = ActuatorHandler;
}
+ context.current_module = module;
if (module_handler) {
- module_handler(data, params);
+ module_handler(&context, params);
} else {
- char buf[BUFSIZ];
-
- FCGI_BeginJSON(400, module);
- FCGI_BuildJSON("description", "400 Invalid response");
- snprintf(buf, BUFSIZ, "%d", count);
- FCGI_BuildJSON("request-number", buf);
- FCGI_BuildJSON("params", params);
- FCGI_BuildJSON("host", getenv("SERVER_HOSTNAME"));
- FCGI_BuildJSON("user", getenv("REMOTE_USER"));
- FCGI_BuildJSON("userip", getenv("REMOTE_ADDR"));
- FCGI_EndJSON();
+ strncat(module, " [unknown]", BUFSIZ);
+ FCGI_RejectJSON(&context);
}
-
- count++;
+
+ context.response_number++;
}
}
git.ucc.asn.au / matches / MCTX3420.git / blobdiff
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