#include <fcgi_stdio.h>
#include <openssl/sha.h>
-#include <time.h>
+#include <stdarg.h>
#include "common.h"
#include "sensor.h"
+#include "actuator.h"
#include "control.h"
#include "options.h"
+#include "image.h"
-/**The time period (in seconds) before the control key expires @ */
+/**The time period (in seconds) before the control key expires */
#define CONTROL_TIMEOUT 180
/**Contextual information related to FCGI requests*/
};
/**
- * Identifies current version info. Useful for testing that the API is running.
- * TODO - Consider adding info about available sensors and actuators (eg capabilities)?
+ * Identifies build information and the current API version to the user.
+ * Also useful for testing that the API is running and identifying the
+ * sensors and actuators present.
+ * @param context The context to work in
+ * @param params User specified paramters: [actuators, sensors]
*/
static void IdentifyHandler(FCGIContext *context, char *params) {
+ bool ident_sensors = false, ident_actuators = false;
+
+ int i;
+
+ FCGIValue values[2] = {{"sensors", &ident_sensors, FCGI_BOOL_T},
+ {"actuators", &ident_actuators, FCGI_BOOL_T}};
+ if (!FCGI_ParseRequest(context, params, values, 2))
+ return;
+
FCGI_BeginJSON(context, STATUS_OK);
FCGI_JSONPair("description", "MCTX3420 Server API (2013)");
FCGI_JSONPair("build_date", __DATE__ " " __TIME__);
+ FCGI_JSONLong("api_version", API_VERSION);
+
+ //Sensor and actuator information
+ if (ident_sensors) {
+ FCGI_JSONKey("sensors");
+ FCGI_JSONValue("{\n\t\t");
+ for (i = 0; i < NUMSENSORS; i++) {
+ if (i > 0) {
+ FCGI_JSONValue(",\n\t\t");
+ }
+ FCGI_JSONValue("\"%d\" : \"%s\"", i, g_sensor_names[i]);
+ }
+ FCGI_JSONValue("\n\t}");
+ }
+ if (ident_actuators) {
+ FCGI_JSONKey("actuators");
+ FCGI_JSONValue("{\n\t\t");
+ for (i = 0; i < NUMACTUATORS; i++) {
+ if (i > 0) {
+ FCGI_JSONValue(",\n\t\t");
+ }
+ FCGI_JSONValue("\"%d\" : \"%s\"", i, g_actuator_names[i]);
+ }
+ FCGI_JSONValue("\n\t}");
+ }
FCGI_EndJSON();
}
* @param context The context to work in
* @param force Whether to force key generation or not.
*/
-void FCGI_BeginControl(FCGIContext *context, bool force) {
+void FCGI_LockControl(FCGIContext *context, bool force) {
time_t now = time(NULL);
bool expired = now - context->control_timestamp > CONTROL_TIMEOUT;
* Revokes the current control key, if present.
* @param context The context to work in
*/
-void FCGI_EndControl(FCGIContext *context) {
+void FCGI_ReleaseControl(FCGIContext *context) {
*(context->control_key) = 0;
FCGI_BeginJSON(context, STATUS_OK);
FCGI_EndJSON();
return ptr;
}
+/**
+ * Aids in parsing request parameters.
+ * Input: The expected keys along with their type and whether or not
+ * they're required.
+ * @param context The context to work in
+ * @param params The parameter string to be parsed
+ * @param values An array of FCGIValue's that specify expected keys
+ * @param count The number of elements in 'values'.
+ * @return true If the parameter string was parsed successfully, false otherwise.
+ * Modes of failure include: Invalid a parsing error on the value,
+ * an unknown key is specified,
+ * a key/value pair is specified more than once, or
+ * not all required keys were present.
+ * If this function returns false, it is guaranteed that FCGI_RejectJSON
+ * has already been called with the appropriate description message.
+ */
+bool FCGI_ParseRequest(FCGIContext *context, char *params, FCGIValue values[], size_t count)
+{
+ const char *key, *value;
+ char buf[BUFSIZ], *ptr;
+ size_t i;
+
+ while ((params = FCGI_KeyPair(params, &key, &value))) {
+ for (i = 0; i < count; i++) {
+ if (!strcmp(key, values[i].key)) {
+ FCGIValue *val = &values[i];
+
+ if (FCGI_RECEIVED(val->flags)) {
+ snprintf(buf, BUFSIZ, "Value already specified for '%s'.", key);
+ FCGI_RejectJSON(context, buf);
+ return false;
+ }
+ val->flags |= FCGI_PARAM_RECEIVED;
+
+ switch(FCGI_TYPE(val->flags)) {
+ case FCGI_BOOL_T:
+ *((bool*) val->value) = true;
+ break;
+ case FCGI_INT_T: case FCGI_LONG_T: {
+ long parsed = strtol(value, &ptr, 10);
+ if (!*value || *ptr) {
+ snprintf(buf, BUFSIZ, "Expected int for '%s' but got '%s'", key, value);
+ FCGI_RejectJSON(context, buf);
+ return false;
+ }
+
+ if (FCGI_TYPE(val->flags) == FCGI_INT_T)
+ *((int*) val->value) = (int) parsed;
+ else
+ *((long*) val->value) = parsed;
+ } break;
+ case FCGI_DOUBLE_T:
+ *((double*) val->value) = strtod(value, &ptr);
+ if (!*value || *ptr) {
+ snprintf(buf, BUFSIZ, "Expected float for '%s' but got '%s'", key, value);
+ FCGI_RejectJSON(context, buf);
+ return false;
+ }
+ break;
+ case FCGI_STRING_T:
+ *((const char**) val->value) = value;
+ break;
+ default:
+ Fatal("Invalid type %d given", FCGI_TYPE(val->flags));
+ }
+ break; //No need to search any more
+ }
+ } //End for loop
+ if (i == count) {
+ snprintf(buf, BUFSIZ, "Unknown key '%s' specified", key);
+ FCGI_RejectJSON(context, buf);
+ return false;
+ }
+ }
+
+ //Check that required parameters are received
+ for (i = 0; i < count; i++) {
+ if (FCGI_IS_REQUIRED(values[i].flags) && !FCGI_RECEIVED(values[i].flags)) {
+ snprintf(buf, BUFSIZ, "Key '%s' required, but was not given.", values[i].key);
+ FCGI_RejectJSON(context, buf);
+ return false;
+ }
+ }
+ return true;
+}
+
/**
* Begins a response to the client in JSON format.
* @param context The context to work in.
printf("{\r\n");
printf("\t\"module\" : \"%s\"", context->current_module);
FCGI_JSONLong("status", status_code);
-
- // Jeremy: Should we include a timestamp in the JSON; something like this?
- double start_time = g_options.start_time.tv_sec + 1e-6*(g_options.start_time.tv_usec);
+ //Time and running statistics
struct timeval now;
gettimeofday(&now, NULL);
- double current_time = now.tv_sec + 1e-6*(now.tv_usec);
- FCGI_JSONDouble("start_time", start_time);
- FCGI_JSONDouble("current_time", current_time);
- FCGI_JSONDouble("running_time", current_time - start_time);
-
+ FCGI_JSONDouble("start_time", TIMEVAL_TO_DOUBLE(g_options.start_time));
+ FCGI_JSONDouble("current_time", TIMEVAL_TO_DOUBLE(now));
+ FCGI_JSONDouble("running_time", TIMEVAL_DIFF(now, g_options.start_time));
+ FCGI_JSONPair("control_state", Control_GetModeName());
}
/**
* Adds a key/value pair to a JSON response. The response must have already
- * been initiated by FCGI_BeginJSON. Note that characters are not escaped.
+ * been initiated by FCGI_BeginJSON. Special characters are not escaped.
* @param key The key of the JSON entry
* @param value The value associated with the key.
*/
printf("\r\n}\r\n");
}
-/**
- * To be used when the input parameters are invalid. The return data will
- * have a status of STATUS_ERROR, along with other debugging information.
- * @param context The context to work in
- */
-void FCGI_RejectJSON(FCGIContext *context)
-{
- FCGI_RejectJSONEx(context, STATUS_ERROR, "Invalid request");
-}
-
/**
* To be used when the input parameters are rejected. The return data
* will also have debugging information provided.
*/
void FCGI_RejectJSONEx(FCGIContext *context, StatusCodes status, const char *description)
{
- description = !description ? "" : description;
+ if (description == NULL)
+ description = "Unknown";
Log(LOGINFO, "%s: Rejected query with: %d: %s", context->current_module, status, description);
FCGI_BeginJSON(context, status);
FCGI_JSONPair("description", description);
FCGI_JSONLong("responsenumber", context->response_number);
- FCGI_JSONPair("params", getenv("QUERY_STRING"));
+ //FCGI_JSONPair("params", getenv("QUERY_STRING"));
FCGI_JSONPair("host", getenv("SERVER_HOSTNAME"));
FCGI_JSONPair("user", getenv("REMOTE_USER"));
FCGI_JSONPair("ip", getenv("REMOTE_ADDR"));
va_end(list);
}
+
+/**
+ * Write binary data
+ * See fwrite
+ */
+void FCGI_WriteBinary(void * data, size_t size, size_t num_elem)
+{
+ Log(LOGDEBUG,"Writing!");
+ fwrite(data, size, num_elem, stdout);
+}
+
+/**
+ * Escapes a string so it can be used safely.
+ * Currently escapes to ensure the validity for use as a JSON string
+ * Does not support unicode specifiers in the form of \uXXXX.
+ * @param buf The string to be escaped
+ * @return The escaped string (return value == buf)
+ */
+char *FCGI_EscapeText(char *buf)
+{
+ int length, i;
+ length = strlen(buf);
+
+ //Escape special characters. Must count down to escape properly
+ for (i = length - 1; i >= 0; i--) {
+ if (buf[i] < 0x20) { //Control characters
+ buf[i] = ' ';
+ } else if (buf[i] == '"') {
+ if (i-1 >= 0 && buf[i-1] == '\\')
+ i--;
+ else
+ buf[i] = '\'';
+ } else if (buf[i] == '\\') {
+ if (i-1 >= 0 && buf[i-1] == '\'')
+ i--;
+ else
+ buf[i] = ' ';
+ }
+ }
+ return buf;
+}
+
/**
* Main FCGI request loop that receives/responds to client requests.
* @param data Reserved.
{
FCGIContext context = {0};
- Log(LOGDEBUG, "First request...");
- //TODO: The FCGI_Accept here is blocking.
- // That means that if another thread terminates the program, this thread
- // will not terminate until the next request is made.
+ Log(LOGDEBUG, "Start loop");
while (FCGI_Accept() >= 0) {
-
- if (Thread_Runstate() != RUNNING)
- {
- //TODO: Yeah... deal with this better :P
- Log(LOGERR, "FIXME; FCGI gets request after other threads have finished.");
- printf("Content-type: text/plain\r\n\r\n+++OUT OF CHEESE ERROR+++\n");
- break;
- }
- Log(LOGDEBUG, "Got request #%d", context.response_number);
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"));
+
+ Log(LOGDEBUG, "Got request #%d - Module %s, params %s", context.response_number, module, params);
//Remove trailing slashes (if present) from module query
size_t lastchar = strlen(module) - 1;
if (lastchar > 0 && module[lastchar] == '/')
module[lastchar] = 0;
+
+ //Escape all special characters
+ FCGI_EscapeText(params);
+
+ //Default to the 'identify' module if none specified
+ if (!*module)
+ strcpy(module, "identify");
- if (!*module || !strcmp("identify", module)) {
+ if (!strcmp("identify", module)) {
module_handler = IdentifyHandler;
} else if (!strcmp("control", module)) {
module_handler = Control_Handler;
} else if (!strcmp("sensors", module)) {
module_handler = Sensor_Handler;
+ } else if (!strcmp("actuators", module)) {
+ module_handler = Actuator_Handler;
+ } else if (!strcmp("image", module)) {
+ module_handler = Image_Handler;
}
context.current_module = module;
if (module_handler) {
module_handler(&context, params);
} else {
- strncat(module, " (unhandled)", BUFSIZ);
- FCGI_RejectJSON(&context);
+ FCGI_RejectJSON(&context, "Unhandled module");
}
context.response_number++;
- Log(LOGDEBUG, "Waiting for request #%d", context.response_number);
+
}
Log(LOGDEBUG, "Thread exiting.");
- Thread_QuitProgram(false);
// NOTE: Don't call pthread_exit, because this runs in the main thread. Just return.
return NULL;
}
git.ucc.asn.au / matches / MCTX3420.git / blobdiff
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