Moved s3_pkt.c, s23_pkt.c and d1_pkt.c into the record layer.

Reviewed-by: Richard Levitte <levitte@openssl.org>

1 files changed, 0 insertions, 1312 deletions

diff --git a/ssl/d1_pkt.c b/ssl/d1_pkt.c
deleted file mode 100644
index d82e0d5827..0000000000
--- a/ssl/d1_pkt.c
+++ /dev/null
@@ -1,1312 +0,0 @@
-/* ssl/d1_pkt.c */
-/*
- * DTLS implementation written by Nagendra Modadugu
- * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
- */
-/* ====================================================================
- * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- *    software must display the following acknowledgment:
- *    "This product includes software developed by the OpenSSL Project
- *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- *    endorse or promote products derived from this software without
- *    prior written permission. For written permission, please contact
- *    openssl-core@openssl.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- *    nor may "OpenSSL" appear in their names without prior written
- *    permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- *    acknowledgment:
- *    "This product includes software developed by the OpenSSL Project
- *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com).  This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
- *
- */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to.  The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *    "This product includes cryptographic software written by
- *     Eric Young (eay@cryptsoft.com)"
- *    The word 'cryptographic' can be left out if the rouines from the library
- *    being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- *    the apps directory (application code) you must include an acknowledgement:
- *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed.  i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- */
-
-#include <stdio.h>
-#include <errno.h>
-#define USE_SOCKETS
-#include "ssl_locl.h"
-#include <openssl/evp.h>
-#include <openssl/buffer.h>
-#include <openssl/pqueue.h>
-#include <openssl/rand.h>
-
-/* mod 128 saturating subtract of two 64-bit values in big-endian order */
-static int satsub64be(const unsigned char *v1, const unsigned char *v2)
-{
-    int ret, sat, brw, i;
-
-    if (sizeof(long) == 8)
-        do {
-            const union {
-                long one;
-                char little;
-            } is_endian = {
-                1
-            };
-            long l;
-
-            if (is_endian.little)
-                break;
-            /* not reached on little-endians */
-            /*
-             * following test is redundant, because input is always aligned,
-             * but I take no chances...
-             */
-            if (((size_t)v1 | (size_t)v2) & 0x7)
-                break;
-
-            l = *((long *)v1);
-            l -= *((long *)v2);
-            if (l > 128)
-                return 128;
-            else if (l < -128)
-                return -128;
-            else
-                return (int)l;
-        } while (0);
-
-    ret = (int)v1[7] - (int)v2[7];
-    sat = 0;
-    brw = ret >> 8;             /* brw is either 0 or -1 */
-    if (ret & 0x80) {
-        for (i = 6; i >= 0; i--) {
-            brw += (int)v1[i] - (int)v2[i];
-            sat |= ~brw;
-            brw >>= 8;
-        }
-    } else {
-        for (i = 6; i >= 0; i--) {
-            brw += (int)v1[i] - (int)v2[i];
-            sat |= brw;
-            brw >>= 8;
-        }
-    }
-    brw <<= 8;                  /* brw is either 0 or -256 */
-
-    if (sat & 0xff)
-        return brw | 0x80;
-    else
-        return brw + (ret & 0xFF);
-}
-
-static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
-                                   int len, int peek);
-
-/* copy buffered record into SSL structure */
-static int dtls1_copy_record(SSL *s, pitem *item)
-{
-    DTLS1_RECORD_DATA *rdata;
-
-    rdata = (DTLS1_RECORD_DATA *)item->data;
-
-    SSL3_BUFFER_release(RECORD_LAYER_get_rbuf(&s->rlayer));
-
-    s->packet = rdata->packet;
-    s->packet_length = rdata->packet_length;
-    memcpy(RECORD_LAYER_get_rbuf(&s->rlayer), &(rdata->rbuf),
-        sizeof(SSL3_BUFFER));
-    memcpy(RECORD_LAYER_get_rrec(&s->rlayer), &(rdata->rrec),
-        sizeof(SSL3_RECORD));
-
-    /* Set proper sequence number for mac calculation */
-    memcpy(&(s->s3->read_sequence[2]), &(rdata->packet[5]), 6);
-
-    return (1);
-}
-
-int
-dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority)
-{
-    DTLS1_RECORD_DATA *rdata;
-    pitem *item;
-
-    /* Limit the size of the queue to prevent DOS attacks */
-    if (pqueue_size(queue->q) >= 100)
-        return 0;
-
-    rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
-    item = pitem_new(priority, rdata);
-    if (rdata == NULL || item == NULL) {
-        if (rdata != NULL)
-            OPENSSL_free(rdata);
-        if (item != NULL)
-            pitem_free(item);
-
-        SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
-        return -1;
-    }
-
-    rdata->packet = s->packet;
-    rdata->packet_length = s->packet_length;
-    memcpy(&(rdata->rbuf), RECORD_LAYER_get_rbuf(&s->rlayer),
-        sizeof(SSL3_BUFFER));
-    memcpy(&(rdata->rrec), RECORD_LAYER_get_rrec(&s->rlayer),
-        sizeof(SSL3_RECORD));
-
-    item->data = rdata;
-
-#ifndef OPENSSL_NO_SCTP
-    /* Store bio_dgram_sctp_rcvinfo struct */
-    if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
-        (s->state == SSL3_ST_SR_FINISHED_A
-         || s->state == SSL3_ST_CR_FINISHED_A)) {
-        BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO,
-                 sizeof(rdata->recordinfo), &rdata->recordinfo);
-    }
-#endif
-
-    s->packet = NULL;
-    s->packet_length = 0;
-    memset(RECORD_LAYER_get_rbuf(&s->rlayer), 0, sizeof(SSL3_BUFFER));
-    memset(RECORD_LAYER_get_rrec(&s->rlayer), 0, sizeof(SSL3_RECORD));
-
-    if (!ssl3_setup_buffers(s)) {
-        SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
-        if (rdata->rbuf.buf != NULL)
-            OPENSSL_free(rdata->rbuf.buf);
-        OPENSSL_free(rdata);
-        pitem_free(item);
-        return (-1);
-    }
-
-    /* insert should not fail, since duplicates are dropped */
-    if (pqueue_insert(queue->q, item) == NULL) {
-        SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
-        if (rdata->rbuf.buf != NULL)
-            OPENSSL_free(rdata->rbuf.buf);
-        OPENSSL_free(rdata);
-        pitem_free(item);
-        return (-1);
-    }
-
-    return (1);
-}
-
-int dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
-{
-    pitem *item;
-
-    item = pqueue_pop(queue->q);
-    if (item) {
-        dtls1_copy_record(s, item);
-
-        OPENSSL_free(item->data);
-        pitem_free(item);
-
-        return (1);
-    }
-
-    return (0);
-}
-
-/*
- * retrieve a buffered record that belongs to the new epoch, i.e., not
- * processed yet
- */
-#define dtls1_get_unprocessed_record(s) \
-                   dtls1_retrieve_buffered_record((s), \
-                   &((s)->d1->unprocessed_rcds))
-
-
-int dtls1_process_buffered_records(SSL *s)
-{
-    pitem *item;
-
-    item = pqueue_peek(s->d1->unprocessed_rcds.q);
-    if (item) {
-        /* Check if epoch is current. */
-        if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
-            return (1);         /* Nothing to do. */
-
-        /* Process all the records. */
-        while (pqueue_peek(s->d1->unprocessed_rcds.q)) {
-            dtls1_get_unprocessed_record(s);
-            if (!dtls1_process_record(s))
-                return (0);
-            if (dtls1_buffer_record(s, &(s->d1->processed_rcds),
-                SSL3_RECORD_get_seq_num(RECORD_LAYER_get_rrec(&s->rlayer))) < 0)
-                return -1;
-        }
-    }
-
-    /*
-     * sync epoch numbers once all the unprocessed records have been
-     * processed
-     */
-    s->d1->processed_rcds.epoch = s->d1->r_epoch;
-    s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
-
-    return (1);
-}
-
-
-/*-
- * Return up to 'len' payload bytes received in 'type' records.
- * 'type' is one of the following:
- *
- *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
- *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
- *   -  0 (during a shutdown, no data has to be returned)
- *
- * If we don't have stored data to work from, read a SSL/TLS record first
- * (possibly multiple records if we still don't have anything to return).
- *
- * This function must handle any surprises the peer may have for us, such as
- * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
- * a surprise, but handled as if it were), or renegotiation requests.
- * Also if record payloads contain fragments too small to process, we store
- * them until there is enough for the respective protocol (the record protocol
- * may use arbitrary fragmentation and even interleaving):
- *     Change cipher spec protocol
- *             just 1 byte needed, no need for keeping anything stored
- *     Alert protocol
- *             2 bytes needed (AlertLevel, AlertDescription)
- *     Handshake protocol
- *             4 bytes needed (HandshakeType, uint24 length) -- we just have
- *             to detect unexpected Client Hello and Hello Request messages
- *             here, anything else is handled by higher layers
- *     Application data protocol
- *             none of our business
- */
-int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
-{
-    int al, i, j, ret;
-    unsigned int n;
-    SSL3_RECORD *rr;
-    void (*cb) (const SSL *ssl, int type2, int val) = NULL;
-
-    if (!SSL3_BUFFER_is_initialised(RECORD_LAYER_get_rbuf(&s->rlayer))) {
-        /* Not initialized yet */
-        if (!ssl3_setup_buffers(s))
-            return (-1);
-    }
-
-    if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
-         (type != SSL3_RT_HANDSHAKE)) ||
-        (peek && (type != SSL3_RT_APPLICATION_DATA))) {
-        SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
-        return -1;
-    }
-
-    /*
-     * check whether there's a handshake message (client hello?) waiting
-     */
-    if ((ret = have_handshake_fragment(s, type, buf, len, peek)))
-        return ret;
-
-    /*
-     * Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE.
-     */
-
-#ifndef OPENSSL_NO_SCTP
-    /*
-     * Continue handshake if it had to be interrupted to read app data with
-     * SCTP.
-     */
-    if ((!s->in_handshake && SSL_in_init(s)) ||
-        (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
-         (s->state == DTLS1_SCTP_ST_SR_READ_SOCK
-          || s->state == DTLS1_SCTP_ST_CR_READ_SOCK)
-         && s->s3->in_read_app_data != 2))
-#else
-    if (!s->in_handshake && SSL_in_init(s))
-#endif
-    {
-        /* type == SSL3_RT_APPLICATION_DATA */
-        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);
-        }
-    }
-
- start:
-    s->rwstate = SSL_NOTHING;
-
-    /*-
-     * s->s3->rrec.type         - is the type of record
-     * s->s3->rrec.data,    - data
-     * s->s3->rrec.off,     - offset into 'data' for next read
-     * s->s3->rrec.length,  - number of bytes.
-     */
-    rr = RECORD_LAYER_get_rrec(&s->rlayer);
-
-    /*
-     * We are not handshaking and have no data yet, so process data buffered
-     * during the last handshake in advance, if any.
-     */
-    if (s->state == SSL_ST_OK && rr->length == 0) {
-        pitem *item;
-        item = pqueue_pop(s->d1->buffered_app_data.q);
-        if (item) {
-#ifndef OPENSSL_NO_SCTP
-            /* Restore bio_dgram_sctp_rcvinfo struct */
-            if (BIO_dgram_is_sctp(SSL_get_rbio(s))) {
-                DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data;
-                BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO,
-                         sizeof(rdata->recordinfo), &rdata->recordinfo);
-            }
-#endif
-
-            dtls1_copy_record(s, item);
-
-            OPENSSL_free(item->data);
-            pitem_free(item);
-        }
-    }
-
-    /* Check for timeout */
-    if (dtls1_handle_timeout(s) > 0)
-        goto start;
-
-    /* get new packet if necessary */
-    if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY)) {
-        ret = dtls1_get_record(s);
-        if (ret <= 0) {
-            ret = dtls1_read_failed(s, ret);
-            /* anything other than a timeout is an error */
-            if (ret <= 0)
-                return (ret);
-            else
-                goto start;
-        }
-    }
-
-    if (s->d1->listen && rr->type != SSL3_RT_HANDSHAKE) {
-        rr->length = 0;
-        goto start;
-    }
-
-    /* we now have a packet which can be read and processed */
-
-    if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
-                                   * reset by ssl3_get_finished */
-        && (rr->type != SSL3_RT_HANDSHAKE)) {
-        /*
-         * We now have application data between CCS and Finished. Most likely
-         * the packets were reordered on their way, so buffer the application
-         * data for later processing rather than dropping the connection.
-         */
-        if (dtls1_buffer_record(s, &(s->d1->buffered_app_data), rr->seq_num) <
-            0) {
-            SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
-            return -1;
-        }
-        rr->length = 0;
-        goto start;
-    }
-
-    /*
-     * If the other end has shut down, throw anything we read away (even in
-     * 'peek' mode)
-     */
-    if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
-        rr->length = 0;
-        s->rwstate = SSL_NOTHING;
-        return (0);
-    }
-
-    if (type == rr->type) {     /* SSL3_RT_APPLICATION_DATA or
-                                 * SSL3_RT_HANDSHAKE */
-        /*
-         * make sure that we are not getting application data when we are
-         * doing a handshake for the first time
-         */
-        if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
-            (s->enc_read_ctx == NULL)) {
-            al = SSL_AD_UNEXPECTED_MESSAGE;
-            SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE);
-            goto f_err;
-        }
-
-        if (len <= 0)
-            return (len);
-
-        if ((unsigned int)len > rr->length)
-            n = rr->length;
-        else
-            n = (unsigned int)len;
-
-        memcpy(buf, &(rr->data[rr->off]), n);
-        if (!peek) {
-            rr->length -= n;
-            rr->off += n;
-            if (rr->length == 0) {
-                s->rstate = SSL_ST_READ_HEADER;
-                rr->off = 0;
-            }
-        }
-#ifndef OPENSSL_NO_SCTP
-        /*
-         * We were about to renegotiate but had to read belated application
-         * data first, so retry.
-         */
-        if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
-            rr->type == SSL3_RT_APPLICATION_DATA &&
-            (s->state == DTLS1_SCTP_ST_SR_READ_SOCK
-             || s->state == DTLS1_SCTP_ST_CR_READ_SOCK)) {
-            s->rwstate = SSL_READING;
-            BIO_clear_retry_flags(SSL_get_rbio(s));
-            BIO_set_retry_read(SSL_get_rbio(s));
-        }
-
-        /*
-         * We might had to delay a close_notify alert because of reordered
-         * app data. If there was an alert and there is no message to read
-         * anymore, finally set shutdown.
-         */
-        if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
-            s->d1->shutdown_received
-            && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
-            s->shutdown |= SSL_RECEIVED_SHUTDOWN;
-            return (0);
-        }
-#endif
-        return (n);
-    }
-
-    /*
-     * If we get here, then type != rr->type; if we have a handshake message,
-     * then it was unexpected (Hello Request or Client Hello).
-     */
-
-    /*
-     * 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->d1->handshake_fragment;
-            dest = s->d1->handshake_fragment;
-            dest_len = &s->d1->handshake_fragment_len;
-        } else if (rr->type == SSL3_RT_ALERT) {
-            dest_maxlen = sizeof(s->d1->alert_fragment);
-            dest = s->d1->alert_fragment;
-            dest_len = &s->d1->alert_fragment_len;
-        }
-#ifndef OPENSSL_NO_HEARTBEATS
-        else if (rr->type == TLS1_RT_HEARTBEAT) {
-            /* We allow a 0 return */
-            if(dtls1_process_heartbeat(s) < 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->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->d1->handshake_fragment_len == 12  iff  rr->type == SSL3_RT_HANDSHAKE;
-     * s->d1->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->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
-        (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
-        (s->session != NULL) && (s->session->cipher != NULL)) {
-        s->d1->handshake_fragment_len = 0;
-
-        if ((s->d1->handshake_fragment[1] != 0) ||
-            (s->d1->handshake_fragment[2] != 0) ||
-            (s->d1->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->d1->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(
-                        RECORD_LAYER_get_rbuf(&s->rlayer)) == 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);
-                    }
-                }
-            }
-        }
-        /*
-         * we either finished a handshake or ignored the request, now try
-         * again to obtain the (application) data we were asked for
-         */
-        goto start;
-    }
-
-    if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) {
-        int alert_level = s->d1->alert_fragment[0];
-        int alert_descr = s->d1->alert_fragment[1];
-
-        s->d1->alert_fragment_len = 0;
-
-        if (s->msg_callback)
-            s->msg_callback(0, s->version, SSL3_RT_ALERT,
-                            s->d1->alert_fragment, 2, s, s->msg_callback_arg);
-
-        if (s->info_callback != NULL)
-            cb = s->info_callback;
-        else if (s->ctx->info_callback != NULL)
-            cb = s->ctx->info_callback;
-
-        if (cb != NULL) {
-            j = (alert_level << 8) | alert_descr;
-            cb(s, SSL_CB_READ_ALERT, j);
-        }
-
-        if (alert_level == SSL3_AL_WARNING) {
-            s->s3->warn_alert = alert_descr;
-            if (alert_descr == SSL_AD_CLOSE_NOTIFY) {
-#ifndef OPENSSL_NO_SCTP
-                /*
-                 * With SCTP and streams the socket may deliver app data
-                 * after a close_notify alert. We have to check this first so
-                 * that nothing gets discarded.
-                 */
-                if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
-                    BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
-                    s->d1->shutdown_received = 1;
-                    s->rwstate = SSL_READING;
-                    BIO_clear_retry_flags(SSL_get_rbio(s));
-                    BIO_set_retry_read(SSL_get_rbio(s));
-                    return -1;
-                }
-#endif
-                s->shutdown |= SSL_RECEIVED_SHUTDOWN;
-                return (0);
-            }
-#if 0
-            /* XXX: this is a possible improvement in the future */
-            /* now check if it's a missing record */
-            if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) {
-                unsigned short seq;
-                unsigned int frag_off;
-                unsigned char *p = &(s->d1->alert_fragment[2]);
-
-                n2s(p, seq);
-                n2l3(p, frag_off);
-
-                dtls1_retransmit_message(s,
-                                         dtls1_get_queue_priority
-                                         (frag->msg_header.seq, 0), frag_off,
-                                         &found);
-                if (!found && SSL_in_init(s)) {
-                    /*
-                     * fprintf( stderr,"in init = %d\n", SSL_in_init(s));
-                     */
-                    /*
-                     * requested a message not yet sent, send an alert
-                     * ourselves
-                     */
-                    ssl3_send_alert(s, SSL3_AL_WARNING,
-                                    DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
-                }
-            }
-#endif
-        } else if (alert_level == SSL3_AL_FATAL) {
-            char tmp[16];
-
-            s->rwstate = SSL_NOTHING;
-            s->s3->fatal_alert = alert_descr;
-            SSLerr(SSL_F_DTLS1_READ_BYTES,
-                   SSL_AD_REASON_OFFSET + alert_descr);
-            BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr);
-            ERR_add_error_data(2, "SSL alert number ", tmp);
-            s->shutdown |= SSL_RECEIVED_SHUTDOWN;
-            SSL_CTX_remove_session(s->ctx, s->session);
-            return (0);
-        } else {
-            al = SSL_AD_ILLEGAL_PARAMETER;
-            SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE);
-            goto f_err;
-        }
-
-        goto start;
-    }
-
-    if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a
-                                            * shutdown */
-        s->rwstate = SSL_NOTHING;
-        rr->length = 0;
-        return (0);
-    }
-
-    if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) {
-        struct ccs_header_st ccs_hdr;
-        unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH;
-
-        dtls1_get_ccs_header(rr->data, &ccs_hdr);
-
-        if (s->version == DTLS1_BAD_VER)
-            ccs_hdr_len = 3;
-
-        /*
-         * 'Change Cipher Spec' is just a single byte, so we know exactly
-         * what the record payload has to look like
-         */
-        /* XDTLS: check that epoch is consistent */
-        if ((rr->length != ccs_hdr_len) ||
-            (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS)) {
-            i = SSL_AD_ILLEGAL_PARAMETER;
-            SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_CHANGE_CIPHER_SPEC);
-            goto err;
-        }
-
-        rr->length = 0;
-
-        if (s->msg_callback)
-            s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
-                            rr->data, 1, s, s->msg_callback_arg);
-
-        /*
-         * We can't process a CCS now, because previous handshake messages
-         * are still missing, so just drop it.
-         */
-        if (!s->d1->change_cipher_spec_ok) {
-            goto start;
-        }
-
-        s->d1->change_cipher_spec_ok = 0;
-
-        s->s3->change_cipher_spec = 1;
-        if (!ssl3_do_change_cipher_spec(s))
-            goto err;
-
-        /* do this whenever CCS is processed */
-        dtls1_reset_seq_numbers(s, SSL3_CC_READ);
-
-        if (s->version == DTLS1_BAD_VER)
-            s->d1->handshake_read_seq++;
-
-#ifndef OPENSSL_NO_SCTP
-        /*
-         * Remember that a CCS has been received, so that an old key of
-         * SCTP-Auth can be deleted when a CCS is sent. Will be ignored if no
-         * SCTP is used
-         */
-        BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL);
-#endif
-
-        goto start;
-    }
-
-    /*
-     * Unexpected handshake message (Client Hello, or protocol violation)
-     */
-    if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
-        !s->in_handshake) {
-        struct hm_header_st msg_hdr;
-
-        /* this may just be a stale retransmit */
-        dtls1_get_message_header(rr->data, &msg_hdr);
-        if (rr->epoch != s->d1->r_epoch) {
-            rr->length = 0;
-            goto start;
-        }
-
-        /*
-         * If we are server, we may have a repeated FINISHED of the client
-         * here, then retransmit our CCS and FINISHED.
-         */
-        if (msg_hdr.type == SSL3_MT_FINISHED) {
-            if (dtls1_check_timeout_num(s) < 0)
-                return -1;
-
-            dtls1_retransmit_buffered_messages(s);
-            rr->length = 0;
-            goto start;
-        }
-
-        if (((s->state & SSL_ST_MASK) == SSL_ST_OK) &&
-            !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) {
-            s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
-            s->renegotiate = 1;
-            s->new_session = 1;
-        }
-        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(
-                RECORD_LAYER_get_rbuf(&s->rlayer)) == 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);
-            }
-        }
-        goto start;
-    }
-
-    switch (rr->type) {
-    default:
-        /* TLS just ignores unknown message types */
-        if (s->version == TLS1_VERSION) {
-            rr->length = 0;
-            goto start;
-        }
-        al = SSL_AD_UNEXPECTED_MESSAGE;
-        SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD);
-        goto f_err;
-    case SSL3_RT_CHANGE_CIPHER_SPEC:
-    case SSL3_RT_ALERT:
-    case SSL3_RT_HANDSHAKE:
-        /*
-         * we already handled all of these, with the possible exception of
-         * SSL3_RT_HANDSHAKE when s->in_handshake is set, but that should not
-         * happen when type != rr