basic structure and client process chain done

libs/protocol/protocol.h

@@ -0,0 +1,34 @@
+#ifndef PROTOCOL_H
+#define PROTOCOL_H
+
+#include <limits.h>
+#include <stdint.h>
+#include <string.h>
+#include <time.h>
+
+#define VERSION			 1
+#define MAX_CONTENT_SIZE (PIPE_BUF - sizeof(struct MessageHeader))
+#define MESSAGE_SIZE sizeof(struct Message)
+
+typedef struct MessageHeader {
+	// The protocol's version
+	unsigned int version;
+	// The sender is a user
+	unsigned int sender;
+	// The receiver is either a user or a group
+	unsigned int receiver;
+	// The message was sent at this timestamp
+	time_t timestamp;
+} message_header;
+
+typedef struct Message {
+	// The message's header
+	message_header header;
+	// The buffer holding the message
+	char content[MAX_CONTENT_SIZE];
+} message;
+
+
+int new_message(message *m, unsigned int sender, unsigned int receiver, char *content);
+
+#endif // !PROTOCOL_H