Implement Server (#1)

- Generic Server struct
- TCP and UDP

Reviewed-on: #1

include/lfinput.h

@@ -17,4 +17,8 @@ void del_split(char **);
 
 void del_lines(char **);
 
+#define DEFAULT_CAPTURE_SYSTEM_BUFSIZE 1024
+
+const char *capture_system(const char *cmd, int buf_sz);
+
 #endif // LIBFLINT_INPUT_H

include/lfnetwork.h

@@ -0,0 +1,28 @@
+#ifndef LIBFLINT_NET_H
+#define LIBFLINT_NET_H
+
+#include <netdb.h>
+
+typedef enum ServerType {
+    SERVERTYPE_TCP,
+    SERVERTYPE_UDP
+} ServerType;
+
+typedef struct Server {
+    ServerType server_type;
+    int fd;
+    int port;
+    void (*handler)(struct Server *s);
+} Server;
+
+#define DEFAULT_BACKLOG 5
+
+Server *new_server(ServerType type, const char *port, void(handler)(Server *s));
+void delete_server(Server *s);
+int serve(Server *s, int backlog_size);
+void *get_in_addr(struct sockaddr *sa);
+
+// Example handlers
+void handler_tcp_echo(Server *s);
+
+#endif //LIBFLINT_NET_H