* @file fastcgi.c
* @purpose Runs the FCGI request loop to handle web interface requests.
*
- * <stdio.h> should not be included, because these functions are handled by
- * fcgi_stdio.h. If included, it must be included after fcgi_stdio.h.
+ * fcgi_stdio.h must be included before all else so the stdio function
+ * redirection works ok.
*/
#include <fcgi_stdio.h>
-#include <string.h>
-#include <stdlib.h>
-
-/*
- But the suggestion was: FunctionName, variable_name (local or member),
- Structure, ENUMVALUE, Extern_FunctionName, g_global
-*/
-
-//Replace with whatever holds the 'data'
-typedef struct Data Data;
-enum {RESPONSE_OK = 200, RESPONSE_BADREQUEST = 400,
- RESPONSE_UNAUTHORIZED = 401};
-
-typedef void (*ModuleHandler) (Data *data, char *params);
+#include "fastcgi.h"
+//#include "common.h"
/**
* Extracts a key/value pair from a request string.
* @return A pointer to the start of the next search location, or NULL if
* the EOL is reached.
*/
-static char *KeyPair(char *in, const char **key, const char **value) {
- char *next, *split;
+char *FCGI_KeyPair(char *in, const char **key, const char **value)
+{
+ char *ptr;
if (!in || !*in) { //Invalid input or string is EOL
return NULL;
}
*key = in;
- //Must be first so value will be empty if it's not specified
- if ((next = strchr(in, '&'))) {
- *next++ = 0;
- } else { //Don't return NULL as current pair needs to be returned
- next = "";
- }
- if ((split = strchr(in, '='))) {
- *split++ = 0;
- *value = split;
- return next;
+ //Find either = or &, whichever comes first
+ if ((ptr = strpbrk(in, "=&"))) {
+ if (*ptr == '&') { //No value specified
+ *value = ptr;
+ *ptr++ = 0;
+ } else {
+ //Stopped at an '=' sign
+ *ptr++ = 0;
+ *value = ptr;
+ if ((ptr = strchr(ptr,'&'))) {
+ *ptr++ = 0;
+ } else {
+ ptr = "";
+ }
+ }
+ } else { //No value specified and no other pair
+ ptr = "";
+ *value = ptr;
}
- //Split was not found, set to default value
- *value = "";
- return next;
+ return ptr;
}
-static void BeginResponse(int response_code, const char *module) {
- switch (response_code) {
- case RESPONSE_OK:
+/**
+ * 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.
+ */
+void FCGI_BeginJSON(StatusCodes status_code, const char *module)
+{
+ switch (status_code) {
+ case STATUS_OK:
break;
- case RESPONSE_UNAUTHORIZED:
+ case STATUS_UNAUTHORIZED:
printf("Status: 401 Unauthorized\r\n");
break;
default:
printf("\t\"module\" : \"%s\"", module);
}
-static void BuildResponse(const char *key, const char *value) {
+/**
+ * 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.
+ * @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)
+{
printf(",\r\n\t\"%s\" : \"%s\"", key, value);
}
-static void EndResponse() {
+/**
+ * Ends a JSON response that was initiated by FCGI_BeginJSON.
+ */
+void FCGI_EndJSON()
+{
printf("\r\n}\r\n");
}
-static void SensorsHandler(Data *data, char *params) {
- const char *key, *value;
- BeginResponse(RESPONSE_OK, "sensors");
-
- while ((params = KeyPair(params, &key, &value))) {
- BuildResponse(key, value);
- }
- EndResponse();
-
-}
-
-void FCGI_RequestLoop (Data *data)
+/**
+ * Main FCGI request loop that receives/responds to client requests.
+ * @param data A data field to be passed to the selected module handler.
+ */
+void FCGI_RequestLoop (void *data)
{
int count = 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"));
//Remove trailing slashes (if present) from module query
size_t lastchar = strlen(module) - 1;
if (lastchar > 0 && module[lastchar] == '/')
- module[lastchar] = '\0';
+ module[lastchar] = 0;
if (!strcmp("sensors", module)) {
- module_handler = SensorsHandler;
- } else if (!strcmp("admin", module)) {
- //module_handler = AdminHandlerReplace with pointer to admin handler
+ //module_handler = Handler_Sensors;
+ } else if (!strcmp("actuators", module)) {
+
}
if (module_handler) {
} else {
char buf[BUFSIZ];
- BeginResponse(400, module);
- BuildResponse("description", "400 Invalid response");
+ FCGI_BeginJSON(400, module);
+ FCGI_BuildJSON("description", "400 Invalid response");
snprintf(buf, BUFSIZ, "%d", count);
- BuildResponse("request-number", buf);
- BuildResponse("params", params);
- BuildResponse("host", getenv("SERVER_HOSTNAME"));
- EndResponse();
+ FCGI_BuildJSON("request-number", buf);
+ FCGI_BuildJSON("params", params);
+ FCGI_BuildJSON("host", getenv("SERVER_HOSTNAME"));
+ FCGI_EndJSON();
}
count++;
- //Debgging:
- //printf("Module: %s, Params: %s<br>\n", module, params);
- //printf("Request number %d, host <i>%s</i>\n",
- // count++, getenv("SERVER_HOSTNAME"));
}
}
-
-int main(int argc, char *argv[]) {
- FCGI_RequestLoop(NULL);
-}
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