CANON_BUF_SIZE
user_buf, CANON_BUF_SIZE, lenp);
CANON_BUF_SIZE, lenp);
CANON_BUF_SIZE, lenp);
memcpy(conn->user_buf, conn->authid_buf, CANON_BUF_SIZE);
char user_buf[CANON_BUF_SIZE+1], authid_buf[CANON_BUF_SIZE+1];