- /*
- * In case of record types for which we have 'fragment' storage, fill
- * that so that we can process the data at a fixed place.
- */
- {
- unsigned int k, dest_maxlen = 0;
- unsigned char *dest = NULL;
- unsigned int *dest_len = NULL;
-
- if (rr->type == SSL3_RT_HANDSHAKE) {
- dest_maxlen = sizeof s->rlayer.d->handshake_fragment;
- dest = s->rlayer.d->handshake_fragment;
- dest_len = &s->rlayer.d->handshake_fragment_len;
- } else if (rr->type == SSL3_RT_ALERT) {
- dest_maxlen = sizeof(s->rlayer.d->alert_fragment);
- dest = s->rlayer.d->alert_fragment;
- dest_len = &s->rlayer.d->alert_fragment_len;
- }
-#ifndef OPENSSL_NO_HEARTBEATS
- else if (rr->type == TLS1_RT_HEARTBEAT) {
- /* We allow a 0 return */
- if(dtls1_process_heartbeat(s, SSL3_RECORD_get_data(&s->rlayer.rrec),
- SSL3_RECORD_get_length(&s->rlayer.rrec)) < 0) {
- return -1;
- }
- /* Exit and notify application to read again */
- rr->length = 0;
- s->rwstate = SSL_READING;
- BIO_clear_retry_flags(SSL_get_rbio(s));
- BIO_set_retry_read(SSL_get_rbio(s));
- return (-1);
- }
-#endif
- /* else it's a CCS message, or application data or wrong */
- else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC) {
- /*
- * Application data while renegotiating is allowed. Try again
- * reading.
- */
- if (rr->type == SSL3_RT_APPLICATION_DATA) {
- BIO *bio;
- s->s3->in_read_app_data = 2;
- bio = SSL_get_rbio(s);
- s->rwstate = SSL_READING;
- BIO_clear_retry_flags(bio);
- BIO_set_retry_read(bio);
- return (-1);
- }
-
- /* Not certain if this is the right error handling */
- al = SSL_AD_UNEXPECTED_MESSAGE;
- SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
- goto f_err;
- }
-
- if (dest_maxlen > 0) {
- /*
- * XDTLS: In a pathalogical case, the Client Hello may be
- * fragmented--don't always expect dest_maxlen bytes
- */
- if (rr->length < dest_maxlen) {
-#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
- /*
- * for normal alerts rr->length is 2, while
- * dest_maxlen is 7 if we were to handle this
- * non-existing alert...
- */
- FIX ME
-#endif
- s->rlayer.rstate = SSL_ST_READ_HEADER;
- rr->length = 0;
- goto start;
- }
-
- /* now move 'n' bytes: */
- for (k = 0; k < dest_maxlen; k++) {
- dest[k] = rr->data[rr->off++];
- rr->length--;
- }
- *dest_len = dest_maxlen;
- }
- }
-
- /*-
- * s->rlayer.d->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE;
- * s->rlayer.d->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT.
- * (Possibly rr is 'empty' now, i.e. rr->length may be 0.)
- */
-
- /* If we are a client, check for an incoming 'Hello Request': */
- if ((!s->server) &&
- (s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
- (s->rlayer.d->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
- (s->session != NULL) && (s->session->cipher != NULL)) {
- s->rlayer.d->handshake_fragment_len = 0;
-
- if ((s->rlayer.d->handshake_fragment[1] != 0) ||
- (s->rlayer.d->handshake_fragment[2] != 0) ||
- (s->rlayer.d->handshake_fragment[3] != 0)) {
- al = SSL_AD_DECODE_ERROR;
- SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_HELLO_REQUEST);
- goto err;
- }
-
- /*
- * no need to check sequence number on HELLO REQUEST messages
- */
-
- if (s->msg_callback)
- s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
- s->rlayer.d->handshake_fragment, 4, s,
- s->msg_callback_arg);
-
- if (SSL_is_init_finished(s) &&
- !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
- !s->s3->renegotiate) {
- s->d1->handshake_read_seq++;
- s->new_session = 1;
- ssl3_renegotiate(s);
- if (ssl3_renegotiate_check(s)) {
- i = s->handshake_func(s);
- if (i < 0)
- return (i);
- if (i == 0) {
- SSLerr(SSL_F_DTLS1_READ_BYTES,
- SSL_R_SSL_HANDSHAKE_FAILURE);
- return (-1);
- }
-
- if (!(s->mode & SSL_MODE_AUTO_RETRY)) {
- if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) {
- /* no read-ahead left? */
- BIO *bio;
- /*
- * In the case where we try to read application data,
- * but we trigger an SSL handshake, we return -1 with
- * the retry option set. Otherwise renegotiation may
- * cause nasty problems in the blocking world
- */
- s->rwstate = SSL_READING;
- bio = SSL_get_rbio(s);
- BIO_clear_retry_flags(bio);
- BIO_set_retry_read(bio);
- return (-1);
- }
- }
- }