BIO_CTRL_DGRAM_DETECT_PEER_ADDR
case BIO_CTRL_DGRAM_DETECT_PEER_ADDR:
case BIO_CTRL_DGRAM_DETECT_PEER_ADDR: {
(int)BIO_ctrl(b, BIO_CTRL_DGRAM_DETECT_PEER_ADDR, 0, (char *)(peer))