int recv_cred_buffer(int, char *, size_t);
ssize_t send_cred_buffer(int, char*);
int recv_pattern(int fd, const char *pattern, size_t bufsize);
-int init_tcp_socket(int port);
+int tcp_listen(int port);
void enable_crypt(int fd, crypt_function *recv_f, crypt_function *send_f,
void *private_data);
void disable_crypt(int fd);