typedef void crypt_function(unsigned long len,
const unsigned char *indata, unsigned char *outdata, void *private_data);
-int tcp_connect(char *host, int port);
int get_stream_socket(int domain);
int send_buffer(int, const char *);
int send_bin_buffer(int, const char *, size_t);
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 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);