dtls1_do_write
return dtls1_do_write(s, SSL3_RT_HANDSHAKE);
__owur int dtls1_do_write(SSL_CONNECTION *s, uint8_t type);
return dtls1_do_write(s, SSL3_RT_CHANGE_CIPHER_SPEC);
ret = dtls1_do_write(s, frag->msg_header.is_ccs ? SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);