+int ftp_mkdir(struct ftp *ftp, const char *dirname);
+int ftp_rmdir(struct ftp *ftp, const char *dirname);
+int ftp_delete(struct ftp *ftp, const char *fname);
+int ftp_list(struct ftp *ftp);
+int ftp_retrieve(struct ftp *ftp, const char *fname);
+int ftp_store(struct ftp *ftp, const char *fname);