added basic session stuff management

src/sessions.c

@@ -0,0 +1,102 @@
+#include <stdlib.h>
+#include <stdbool.h>
+#include <time.h>
+
+#include <uuid.h>
+
+#include <headers.h>
+
+#include "sessions.h"
+
+struct session {
+	bool inUse;
+	uuid_t id;
+	time_t lastAccess;
+	void* data;
+}* sessions = NULL;
+static size_t sessionno = 0;
+
+#define SESSION_BLOCK_SIZE (128)
+
+int resizeSessionList() {
+	// TODO synchronization
+	struct session* tmp = realloc(session, sizeof(struct session) * (sessionno + SESSION_BLOCK_SIZE));
+	if (tmp == NULL) {
+		return -1;	
+	}
+	memset(tmp + sizeof(struct session) * sessionno, 0, sizeof(struct session) * SESSION_BLOCK_SIZE);
+	sessions = tmp;
+	sessionno += SESSION_BLOCK_SIZE;
+	
+	return 0;
+}
+
+struct session* newSession(size_t size) {
+	for (size_t i = 0; i < sessionno; i++) {
+		if (!sessions[i].inUse) {
+			// TODO synchronization
+			sessions[i].inUse = true;
+			sessions[i].data = malloc(size);
+			if (sessions[i].data == NULL) {
+				sessions[i].inUse = false;
+				return NULL;
+			}
+			return &(sessions[i]);
+		}
+	}
+	
+	// no free session slot
+	if (resizeSessionList() < 0) {
+		return NULL;
+	}
+	
+	return newSession(size);
+}
+
+struct session* findSession(uuid_t id) {
+	for (size_t i = 0; i < sessionno; i++) {
+		if (!sessions[i].inUse) {
+			continue;
+		}
+		if (uuid_compare(sessions[i].id, id) == 0) {
+			return &(sessions[i]);
+		}
+	}
+	
+	return NULL;
+}
+
+void* _session_start(ctx_t* ctx, const char* cookie, size_t size) {
+	char* cookieValue = getCookie(ctx, cookie);
+	
+	bool isValid = false;
+	uuid_t id;
+	struct session* session = NULL;
+	
+	if (cookieValue != NULL) {
+		if (uuid_parse(cookieValue, id) == 0) {
+			isValid = true;
+		}
+		
+		free(cookieValue);
+	} else {
+		isValid = false;
+	}
+	
+	if (isValid) {
+		session = findSession(id);
+	}
+	
+	if (session == NULL) {
+		session = newSession(size);
+		if (session == NULL) {
+			return NULL;
+		}
+		
+		uuid_generate_time(session->id);
+	}
+	
+	session->lastAccess = time(NULL);
+	
+	return session->data;
+}

src/sessions.h

@@ -0,0 +1,23 @@
+#ifndef SESSIONS_H_
+#define SESSIONS_H_
+
+#ifndef SESSION_PTR_TYPE
+	#warning "session ptr type not defined"
+	#define SESSION_PTR_TYPE int
+#endif
+
+#ifndef SESSION_LENGTH
+	#define SESSION_LENGTH (24*60*60*1000)
+#endif
+
+#ifndef SESSION_COOKIE_NAME
+	#define SESSION_COOKIE_NAME "cshore_session"
+#endif
+
+#include "request.h"
+
+void* _session_start(ctx_t*, const char*, size_t);
+
+#define session_start(c) (SESSION_PTR_TYPE*) _session_start(c, SESSION_COOKIE_NAME, sizeof(SESSION_PTR_TYPE))
+
+#endif