reinstall

1 files changed, 0 insertions, 1585 deletions

diff --git a/openssl/ssl/d1_both.c b/openssl/ssl/d1_both.c
deleted file mode 100644
index 9bc6153..0000000
--- a/openssl/ssl/d1_both.c
+++ /dev/null
@@ -1,1585 +0,0 @@
-/* ssl/d1_both.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 <limits.h>
-#include <string.h>
-#include <stdio.h>
-#include "ssl_locl.h"
-#include <openssl/buffer.h>
-#include <openssl/rand.h>
-#include <openssl/objects.h>
-#include <openssl/evp.h>
-#include <openssl/x509.h>
-
-#define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8)
-
-#define RSMBLY_BITMASK_MARK(bitmask, start, end) { \
-                        if ((end) - (start) <= 8) { \
-                                long ii; \
-                                for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \
-                        } else { \
-                                long ii; \
-                                bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \
-                                for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \
-                                bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \
-                        } }
-
-#define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \
-                        long ii; \
-                        OPENSSL_assert((msg_len) > 0); \
-                        is_complete = 1; \
-                        if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \
-                        if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \
-                                if (bitmask[ii] != 0xff) { is_complete = 0; break; } }
-
-#if 0
-# define RSMBLY_BITMASK_PRINT(bitmask, msg_len) { \
-                        long ii; \
-                        printf("bitmask: "); for (ii = 0; ii < (msg_len); ii++) \
-                        printf("%d ", (bitmask[ii >> 3] & (1 << (ii & 7))) >> (ii & 7)); \
-                        printf("\n"); }
-#endif
-
-static unsigned char bitmask_start_values[] =
-    { 0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80 };
-static unsigned char bitmask_end_values[] =
-    { 0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f };
-
-/* XDTLS:  figure out the right values */
-static const unsigned int g_probable_mtu[] = { 1500, 512, 256 };
-
-static void dtls1_fix_message_header(SSL *s, unsigned long frag_off,
-                                     unsigned long frag_len);
-static unsigned char *dtls1_write_message_header(SSL *s, unsigned char *p);
-static void dtls1_set_message_header_int(SSL *s, unsigned char mt,
-                                         unsigned long len,
-                                         unsigned short seq_num,
-                                         unsigned long frag_off,
-                                         unsigned long frag_len);
-static long dtls1_get_message_fragment(SSL *s, int st1, int stn, long max,
-                                       int *ok);
-
-static hm_fragment *dtls1_hm_fragment_new(unsigned long frag_len,
-                                          int reassembly)
-{
-    hm_fragment *frag = NULL;
-    unsigned char *buf = NULL;
-    unsigned char *bitmask = NULL;
-
-    frag = (hm_fragment *)OPENSSL_malloc(sizeof(hm_fragment));
-    if (frag == NULL)
-        return NULL;
-
-    if (frag_len) {
-        buf = (unsigned char *)OPENSSL_malloc(frag_len);
-        if (buf == NULL) {
-            OPENSSL_free(frag);
-            return NULL;
-        }
-    }
-
-    /* zero length fragment gets zero frag->fragment */
-    frag->fragment = buf;
-
-    /* Initialize reassembly bitmask if necessary */
-    if (reassembly) {
-        bitmask =
-            (unsigned char *)OPENSSL_malloc(RSMBLY_BITMASK_SIZE(frag_len));
-        if (bitmask == NULL) {
-            if (buf != NULL)
-                OPENSSL_free(buf);
-            OPENSSL_free(frag);
-            return NULL;
-        }
-        memset(bitmask, 0, RSMBLY_BITMASK_SIZE(frag_len));
-    }
-
-    frag->reassembly = bitmask;
-
-    return frag;
-}
-
-void dtls1_hm_fragment_free(hm_fragment *frag)
-{
-
-    if (frag->msg_header.is_ccs) {
-        EVP_CIPHER_CTX_free(frag->msg_header.
-                            saved_retransmit_state.enc_write_ctx);
-        EVP_MD_CTX_destroy(frag->msg_header.
-                           saved_retransmit_state.write_hash);
-    }
-    if (frag->fragment)
-        OPENSSL_free(frag->fragment);
-    if (frag->reassembly)
-        OPENSSL_free(frag->reassembly);
-    OPENSSL_free(frag);
-}
-
-static int dtls1_query_mtu(SSL *s)
-{
-    if (s->d1->link_mtu) {
-        s->d1->mtu =
-            s->d1->link_mtu - BIO_dgram_get_mtu_overhead(SSL_get_wbio(s));
-        s->d1->link_mtu = 0;
-    }
-
-    /* AHA!  Figure out the MTU, and stick to the right size */
-    if (s->d1->mtu < dtls1_min_mtu(s)) {
-        if (!(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
-            s->d1->mtu =
-                BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
-
-            /*
-             * I've seen the kernel return bogus numbers when it doesn't know
-             * (initial write), so just make sure we have a reasonable number
-             */
-            if (s->d1->mtu < dtls1_min_mtu(s)) {
-                /* Set to min mtu */
-                s->d1->mtu = dtls1_min_mtu(s);
-                BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
-                         s->d1->mtu, NULL);
-            }
-        } else
-            return 0;
-    }
-    return 1;
-}
-
-/*
- * send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or
- * SSL3_RT_CHANGE_CIPHER_SPEC)
- */
-int dtls1_do_write(SSL *s, int type)
-{
-    int ret;
-    unsigned int curr_mtu;
-    int retry = 1;
-    unsigned int len, frag_off, mac_size, blocksize, used_len;
-
-    if (!dtls1_query_mtu(s))
-        return -1;
-
-    OPENSSL_assert(s->d1->mtu >= dtls1_min_mtu(s)); /* should have something
-                                                     * reasonable now */
-
-    if (s->init_off == 0 && type == SSL3_RT_HANDSHAKE)
-        OPENSSL_assert(s->init_num ==
-                       (int)s->d1->w_msg_hdr.msg_len +
-                       DTLS1_HM_HEADER_LENGTH);
-
-    if (s->write_hash) {
-        if (s->enc_write_ctx
-            && EVP_CIPHER_CTX_mode(s->enc_write_ctx) == EVP_CIPH_GCM_MODE)
-            mac_size = 0;
-        else
-            mac_size = EVP_MD_CTX_size(s->write_hash);
-    } else
-        mac_size = 0;
-
-    if (s->enc_write_ctx &&
-        (EVP_CIPHER_CTX_mode(s->enc_write_ctx) == EVP_CIPH_CBC_MODE))
-        blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
-    else
-        blocksize = 0;
-
-    frag_off = 0;
-    s->rwstate = SSL_NOTHING;
-
-    /* s->init_num shouldn't ever be < 0...but just in case */
-    while (s->init_num > 0) {
-        if (type == SSL3_RT_HANDSHAKE && s->init_off != 0) {
-            /* We must be writing a fragment other than the first one */
-
-            if (frag_off > 0) {
-                /* This is the first attempt at writing out this fragment */
-
-                if (s->init_off <= DTLS1_HM_HEADER_LENGTH) {
-                    /*
-                     * Each fragment that was already sent must at least have
-                     * contained the message header plus one other byte.
-                     * Therefore |init_off| must have progressed by at least
-                     * |DTLS1_HM_HEADER_LENGTH + 1| bytes. If not something went
-                     * wrong.
-                     */
-                    return -1;
-                }
-
-                /*
-                 * Adjust |init_off| and |init_num| to allow room for a new
-                 * message header for this fragment.
-                 */
-                s->init_off -= DTLS1_HM_HEADER_LENGTH;
-                s->init_num += DTLS1_HM_HEADER_LENGTH;
-            } else {
-                /*
-                 * We must have been called again after a retry so use the
-                 * fragment offset from our last attempt. We do not need
-                 * to adjust |init_off| and |init_num| as above, because
-                 * that should already have been done before the retry.
-                 */
-                frag_off = s->d1->w_msg_hdr.frag_off;
-            }
-        }
-
-        used_len = BIO_wpending(SSL_get_wbio(s)) + DTLS1_RT_HEADER_LENGTH
-            + mac_size + blocksize;
-        if (s->d1->mtu > used_len)
-            curr_mtu = s->d1->mtu - used_len;
-        else
-            curr_mtu = 0;
-
-        if (curr_mtu <= DTLS1_HM_HEADER_LENGTH) {
-            /*
-             * grr.. we could get an error if MTU picked was wrong
-             */
-            ret = BIO_flush(SSL_get_wbio(s));
-            if (ret <= 0) {
-                s->rwstate = SSL_WRITING;
-                return ret;
-            }
-            used_len = DTLS1_RT_HEADER_LENGTH + mac_size + blocksize;
-            if (s->d1->mtu > used_len + DTLS1_HM_HEADER_LENGTH) {
-                curr_mtu = s->d1->mtu - used_len;
-            } else {
-                /* Shouldn't happen */
-                return -1;
-            }
-        }
-
-        /*
-         * We just checked that s->init_num > 0 so this cast should be safe
-         */
-        if (((unsigned int)s->init_num) > curr_mtu)
-            len = curr_mtu;
-        else
-            len = s->init_num;
-
-        /* Shouldn't ever happen */
-        if (len > INT_MAX)
-            len = INT_MAX;
-
-        /*
-         * XDTLS: this function is too long.  split out the CCS part
-         */
-        if (type == SSL3_RT_HANDSHAKE) {
-            if (len < DTLS1_HM_HEADER_LENGTH) {
-                /*
-                 * len is so small that we really can't do anything sensible
-                 * so fail
-                 */
-                return -1;
-            }
-            dtls1_fix_message_header(s, frag_off,
-                                     len - DTLS1_HM_HEADER_LENGTH);
-
-            dtls1_write_message_header(s,
-                                       (unsigned char *)&s->init_buf->
-                                       data[s->init_off]);
-        }
-
-        ret = dtls1_write_bytes(s, type, &s->init_buf->data[s->init_off],
-                                len);
-        if (ret < 0) {
-            /*
-             * might need to update MTU here, but we don't know which
-             * previous packet caused the failure -- so can't really
-             * retransmit anything.  continue as if everything is fine and
-             * wait for an alert to handle the retransmit
-             */
-            if (retry && BIO_ctrl(SSL_get_wbio(s),
-                                  BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0) {
-                if (!(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
-                    if (!dtls1_query_mtu(s))
-                        return -1;
-                    /* Have one more go */
-                    retry = 0;
-                } else
-                    return -1;
-            } else {
-                return (-1);
-            }
-        } else {
-
-            /*
-             * bad if this assert fails, only part of the handshake message
-             * got sent.  but why would this happen?
-             */
-            OPENSSL_assert(len == (unsigned int)ret);
-
-            if (type == SSL3_RT_HANDSHAKE && !s->d1->retransmitting) {
-                /*
-                 * should not be done for 'Hello Request's, but in that case
-                 * we'll ignore the result anyway
-                 */
-                unsigned char *p =
-                    (unsigned char *)&s->init_buf->data[s->init_off];
-                const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
-                int xlen;
-
-                if (frag_off == 0 && s->version != DTLS1_BAD_VER) {
-                    /*
-                     * reconstruct message header is if it is being sent in
-                     * single fragment
-                     */
-                    *p++ = msg_hdr->type;
-                    l2n3(msg_hdr->msg_len, p);
-                    s2n(msg_hdr->seq, p);
-                    l2n3(0, p);
-                    l2n3(msg_hdr->msg_len, p);
-                    p -= DTLS1_HM_HEADER_LENGTH;
-                    xlen = ret;
-                } else {
-                    p += DTLS1_HM_HEADER_LENGTH;
-                    xlen = ret - DTLS1_HM_HEADER_LENGTH;
-                }
-
-                ssl3_finish_mac(s, p, xlen);
-            }
-
-            if (ret == s->init_num) {
-                if (s->msg_callback)
-                    s->msg_callback(1, s->version, type, s->init_buf->data,
-                                    (size_t)(s->init_off + s->init_num), s,
-                                    s->msg_callback_arg);
-
-                s->init_off = 0; /* done writing this message */
-                s->init_num = 0;
-
-                return (1);
-            }
-            s->init_off += ret;
-            s->init_num -= ret;
-            ret -= DTLS1_HM_HEADER_LENGTH;
-            frag_off += ret;
-
-            /*
-             * We save the fragment offset for the next fragment so we have it
-             * available in case of an IO retry. We don't know the length of the
-             * next fragment yet so just set that to 0 for now. It will be
-             * updated again later.
-             */
-            dtls1_fix_message_header(s, frag_off, 0);
-        }
-    }
-    return (0);
-}
-
-/*
- * Obtain handshake message of message type 'mt' (any if mt == -1), maximum
- * acceptable body length 'max'. Read an entire handshake message.  Handshake
- * messages arrive in fragments.
- */
-long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
-{
-    int i, al;
-    struct hm_header_st *msg_hdr;
-    unsigned char *p;
-    unsigned long msg_len;
-
-    /*
-     * s3->tmp is used to store messages that are unexpected, caused by the
-     * absence of an optional handshake message
-     */
-    if (s->s3->tmp.reuse_message) {
-        s->s3->tmp.reuse_message = 0;
-        if ((mt >= 0) && (s->s3->tmp.message_type != mt)) {
-            al = SSL_AD_UNEXPECTED_MESSAGE;
-            SSLerr(SSL_F_DTLS1_GET_MESSAGE, SSL_R_UNEXPECTED_MESSAGE);
-            goto f_err;
-        }
-        *ok = 1;
-        s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
-        s->init_num = (int)s->s3->tmp.message_size;
-        return s->init_num;
-    }
-
-    msg_hdr = &s->d1->r_msg_hdr;
-    memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
-
- again:
-    i = dtls1_get_message_fragment(s, st1, stn, max, ok);
-    if (i == DTLS1_HM_BAD_FRAGMENT || i == DTLS1_HM_FRAGMENT_RETRY) {
-        /* bad fragment received */
-        goto again;
-    } else if (i <= 0 && !*ok) {
-        return i;
-    }
-
-    if (mt >= 0 && s->s3->tmp.message_type != mt) {
-        al = SSL_AD_UNEXPECTED_MESSAGE;
-        SSLerr(SSL_F_DTLS1_GET_MESSAGE, SSL_R_UNEXPECTED_MESSAGE);
-        goto f_err;
-    }
-
-    p = (unsigned char *)s->init_buf->data;
-    msg_len = msg_hdr->msg_len;
-
-    /* reconstruct message header */
-    *(p++) = msg_hdr->type;
-    l2n3(msg_len, p);
-    s2n(msg_hdr->seq, p);
-    l2n3(0, p);
-    l2n3(msg_len, p);
-    if (s->version != DTLS1_BAD_VER) {
-        p -= DTLS1_HM_HEADER_LENGTH;
-        msg_len += DTLS1_HM_HEADER_LENGTH;
-    }
-
-    ssl3_finish_mac(s, p, msg_len);
-    if (s->msg_callback)
-        s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
-                        p, msg_len, s, s->msg_callback_arg);
-
-    memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
-
-    /* Don't change sequence numbers while listening */
-    if (!s->d1->listen)
-        s->d1->handshake_read_seq++;
-
-    s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
-    return s->init_num;
-
- f_err:
-    ssl3_send_alert(s, SSL3_AL_FATAL, al);
-    *ok = 0;
-    return -1;
-}
-
-static int dtls1_preprocess_fragment(SSL *s, struct hm_header_st *msg_hdr,
-                                     int max)
-{
-    size_t frag_off, frag_len, msg_len;
-
-    msg_len = msg_hdr->msg_len;
-    frag_off = msg_hdr->frag_off;
-    frag_len = msg_hdr->frag_len;
-
-    /* sanity checking */
-    if ((frag_off + frag_len) > msg_len) {
-        SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, SSL_R_EXCESSIVE_MESSAGE_SIZE);
-        return SSL_AD_ILLEGAL_PARAMETER;
-    }
-
-    if ((frag_off + frag_len) > (unsigned long)max) {
-        SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, SSL_R_EXCESSIVE_MESSAGE_SIZE);
-        return SSL_AD_ILLEGAL_PARAMETER;
-    }
-
-    if (s->d1->r_msg_hdr.frag_off == 0) { /* first fragment */
-        /*
-         * msg_len is limited to 2^24, but is effectively checked against max
-         * above
-         *
-         * Make buffer slightly larger than message length as a precaution
-         * against small OOB reads e.g. CVE-2016-6306
-         */
-        if (!BUF_MEM_grow_clean
-            (s->init_buf, msg_len + DTLS1_HM_HEADER_LENGTH + 16)) {
-            SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, ERR_R_BUF_LIB);
-            return SSL_AD_INTERNAL_ERROR;
-        }
-
-        s->s3->tmp.message_size = msg_len;
-        s->d1->r_msg_hdr.msg_len = msg_len;
-        s->s3->tmp.message_type = msg_hdr->type;
-        s->d1->r_msg_hdr.type = msg_hdr->type;
-        s->d1->r_msg_hdr.seq = msg_hdr->seq;
-    } else if (msg_len != s->d1->r_msg_hdr.msg_len) {
-        /*
-         * They must be playing with us! BTW, failure to enforce upper limit
-         * would open possibility for buffer overrun.
-         */
-        SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, SSL_R_EXCESSIVE_MESSAGE_SIZE);
-        return SSL_AD_ILLEGAL_PARAMETER;
-    }
-
-    return 0;                   /* no error */
-}
-
-static int dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
-{
-    /*-
-     * (0) check whether the desired fragment is available
-     * if so:
-     * (1) copy over the fragment to s->init_buf->data[]
-     * (2) update s->init_num
-     */
-    pitem *item;
-    hm_fragment *frag;
-    int al;
-
-    *ok = 0;
-    do {
-        item = pqueue_peek(s->d1->buffered_messages);
-        if (item == NULL)
-            return 0;
-
-        frag = (hm_fragment *)item->data;
-
-        if (frag->msg_header.seq < s->d1->handshake_read_seq) {
-            /* This is a stale message that has been buffered so clear it */
-            pqueue_pop(s->d1->buffered_messages);
-            dtls1_hm_fragment_free(frag);
-            pitem_free(item);
-            item = NULL;
-            frag = NULL;
-        }
-    } while (item == NULL);
-
-
-    /* Don't return if reassembly still in progress */
-    if (frag->reassembly != NULL)
-        return 0;
-
-    if (s->d1->handshake_read_seq == frag->msg_header.seq) {
-        unsigned long frag_len = frag->msg_header.frag_len;
-        pqueue_pop(s->d1->buffered_messages);
-
-        al = dtls1_preprocess_fragment(s, &frag->msg_header, max);
-
-        if (al == 0) {          /* no alert */
-            unsigned char *p =
-                (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
-            memcpy(&p[frag->msg_header.frag_off], frag->fragment,
-                   frag->msg_header.frag_len);
-        }
-
-        dtls1_hm_fragment_free(frag);
-        pitem_free(item);
-
-        if (al == 0) {
-            *ok = 1;
-            return frag_len;
-        }
-
-        ssl3_send_alert(s, SSL3_AL_FATAL, al);
-        s->init_num = 0;
-        *ok = 0;
-        return -1;
-    } else
-        return 0;
-}
-
-/*
- * dtls1_max_handshake_message_len returns the maximum number of bytes
- * permitted in a DTLS handshake message for |s|. The minimum is 16KB, but
- * may be greater if the maximum certificate list size requires it.
- */
-static unsigned long dtls1_max_handshake_message_len(const SSL *s)
-{
-    unsigned long max_len =
-        DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH;
-    if (max_len < (unsigned long)s->max_cert_list)
-        return s->max_cert_list;
-    return max_len;
-}
-
-static int
-dtls1_reassemble_fragment(SSL *s, const struct hm_header_st *msg_hdr, int *ok)
-{
-    hm_fragment *frag = NULL;
-    pitem *item = NULL;
-    int i = -1, is_complete;
-    unsigned char seq64be[8];
-    unsigned long frag_len = msg_hdr->frag_len;
-
-    if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len ||
-        msg_hdr->msg_len > dtls1_max_handshake_message_len(s))
-        goto err;
-
-    if (frag_len == 0)
-        return DTLS1_HM_FRAGMENT_RETRY;
-
-    /* Try to find item in queue */
-    memset(seq64be, 0, sizeof(seq64be));
-    seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
-    seq64be[7] = (unsigned char)msg_hdr->seq;
-    item = pqueue_find(s->d1->buffered_messages, seq64be);
-
-    if (item == NULL) {
-        frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1);
-        if (frag == NULL)
-            goto err;
-        memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
-        frag->msg_header.frag_len = frag->msg_header.msg_len;
-        frag->msg_header.frag_off = 0;
-    } else {
-        frag = (hm_fragment *)item->data;
-        if (frag->msg_header.msg_len != msg_hdr->msg_len) {
-            item = NULL;
-            frag = NULL;
-            goto err;
-        }
-    }
-
-    /*
-     * If message is already reassembled, this must be a retransmit and can
-     * be dropped. In this case item != NULL and so frag does not need to be
-     * freed.
-     */
-    if (frag->reassembly == NULL) {
-        unsigned char devnull[256];
-
-        while (frag_len) {
-            i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
-                                          devnull,
-                                          frag_len >
-                                          sizeof(devnull) ? sizeof(devnull) :
-                                          frag_len, 0);
-            if (i <= 0)
-                goto err;
-            frag_len -= i;
-        }
-        return DTLS1_HM_FRAGMENT_RETRY;
-    }
-
-    /* read the body of the fragment (header has already been read */
-    i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
-                                  frag->fragment + msg_hdr->frag_off,
-                                  frag_len, 0);
-    if ((unsigned long)i != frag_len)
-        i = -1;
-    if (i <= 0)
-        goto err;
-
-    RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off,
-                        (long)(msg_hdr->frag_off + frag_len));
-
-    RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len,
-                               is_complete);
-
-    if (is_complete) {
-        OPENSSL_free(frag->reassembly);
-        frag->reassembly = NULL;
-    }
-
-    if (item == NULL) {
-        item = pitem_new(seq64be, frag);
-        if (item == NULL) {
-            i = -1;
-            goto err;
-        }
-
-        item = pqueue_insert(s->d1->buffered_messages, item);
-        /*
-         * pqueue_insert fails iff a duplicate item is inserted. However,
-         * |item| cannot be a duplicate. If it were, |pqueue_find|, above,
-         * would have returned it and control would never have reached this
-         * branch.
-         */
-        OPENSSL_assert(item != NULL);
-    }
-
-    return DTLS1_HM_FRAGMENT_RETRY;
-
- err:
-    if (frag != NULL && item == NULL)
-        dtls1_hm_fragment_free(frag);
-    *ok = 0;
-    return i;
-}
-
-static int
-dtls1_process_out_of_seq_message(SSL *s, const struct hm_header_st *msg_hdr,
-                                 int *ok)
-{
-    int i = -1;
-    hm_fragment *frag = NULL;
-    pitem *item = NULL;
-    unsigned char seq64be[8];
-    unsigned long frag_len = msg_hdr->frag_len;
-
-    if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len)
-        goto err;
-
-    /* Try to find item in queue, to prevent duplicate entries */
-    memset(seq64be, 0, sizeof(seq64be));
-    seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
-    seq64be[7] = (unsigned char)msg_hdr->seq;
-    item = pqueue_find(s->d1->buffered_messages, seq64be);
-
-    /*
-     * If we already have an entry and this one is a fragment, don't discard
-     * it and rather try to reassemble it.
-     */
-    if (item != NULL && frag_len != msg_hdr->msg_len)
-        item = NULL;
-
-    /*
-     * Discard the message if sequence number was already there, is too far
-     * in the future, already in the queue or if we received a FINISHED
-     * before the SERVER_HELLO, which then must be a stale retransmit.
-     */
-    if (msg_hdr->seq <= s->d1->handshake_read_seq ||
-        msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL ||
-        (s->d1->handshake_read_seq == 0 && msg_hdr->type == SSL3_MT_FINISHED))
-    {
-        unsigned char devnull[256];
-
-        while (frag_len) {
-            i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
-                                          devnull,
-                                          frag_len >
-                                          sizeof(devnull) ? sizeof(devnull) :
-                                          frag_len, 0);
-            if (i <= 0)
-                goto err;
-            frag_len -= i;
-        }
-    } else {
-        if (frag_len != msg_hdr->msg_len)
-            return dtls1_reassemble_fragment(s, msg_hdr, ok);
-
-        if (frag_len > dtls1_max_handshake_message_len(s))
-            goto err;
-
-        frag = dtls1_hm_fragment_new(frag_len, 0);
-        if (frag == NULL)
-            goto err;
-
-        memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
-
-        if (frag_len) {
-            /*
-             * read the body of the fragment (header has already been read
-             */
-            i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
-                                          frag->fragment, frag_len, 0);
-            if ((unsigned long)i != frag_len)
-                i = -1;
-            if (i <= 0)
-                goto err;
-        }
-
-        item = pitem_new(seq64be, frag);
-        if (item == NULL)
-            goto err;
-
-        item = pqueue_insert(s->d1->buffered_messages, item);
-        /*
-         * pqueue_insert fails iff a duplicate item is inserted. However,
-         * |item| cannot be a duplicate. If it were, |pqueue_find|, above,
-         * would have returned it. Then, either |frag_len| !=
-         * |msg_hdr->msg_len| in which case |item| is set to NULL and it will
-         * have been processed with |dtls1_reassemble_fragment|, above, or
-         * the record will have been discarded.
-         */
-        OPENSSL_assert(item != NULL);
-    }
-
-    return DTLS1_HM_FRAGMENT_RETRY;
-
- err:
-    if (frag != NULL && item == NULL)
-        dtls1_hm_fragment_free(frag);
-    *ok = 0;
-    return i;
-}
-
-static long
-dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
-{
-    unsigned char wire[DTLS1_HM_HEADER_LENGTH];
-    unsigned long len, frag_off, frag_len;
-    int i, al;
-    struct hm_header_st msg_hdr;
-
- redo:
-    /* see if we have the required fragment already */
-    if ((frag_len = dtls1_retrieve_buffered_fragment(s, max, ok)) || *ok) {
-        if (*ok)
-            s->init_num = frag_len;
-        return frag_len;
-    }
-
-    /* read handshake message header */
-    i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, wire,
-                                  DTLS1_HM_HEADER_LENGTH, 0);
-    if (i <= 0) {               /* nbio, or an error */
-        s->rwstate = SSL_READING;
-        *ok = 0;
-        return i;
-    }
-    /* Handshake fails if message header is incomplete */
-    if (i != DTLS1_HM_HEADER_LENGTH) {
-        al = SSL_AD_UNEXPECTED_MESSAGE;
-        SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT, SSL_R_UNEXPECTED_MESSAGE);
-        goto f_err;
-    }
-
-    /* parse the message fragment header */
-    dtls1_get_message_header(wire, &msg_hdr);
-
-    len = msg_hdr.msg_len;
-    frag_off = msg_hdr.frag_off;
-    frag_len = msg_hdr.frag_len;
-
-    /*
-     * We must have at least frag_len bytes left in the record to be read.
-     * Fragments must not span records.
-     */
-    if (frag_len > s->s3->rrec.length) {
-        al = SSL3_AD_ILLEGAL_PARAMETER;
-        SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT, SSL_R_BAD_LENGTH);
-        goto f_err;
-    }
-
-    /*
-     * if this is a future (or stale) message it gets buffered
-     * (or dropped)--no further processing at this time
-     * While listening, we accept seq 1 (ClientHello with cookie)
-     * although we're still expecting seq 0 (ClientHello)
-     */
-    if (msg_hdr.seq != s->d1->handshake_read_seq
-        && !(s->d1->listen && msg_hdr.seq == 1))
-        return dtls1_process_out_of_seq_message(s, &msg_hdr, ok);
-
-    if (frag_len && frag_len < len)
-        return dtls1_reassemble_fragment(s, &msg_hdr, ok);
-
-    if (!s->server && s->d1->r_msg_hdr.frag_off == 0 &&
-        wire[0] == SSL3_MT_HELLO_REQUEST) {
-        /*
-         * The server may always send 'Hello Request' messages -- we are
-         * doing a handshake anyway now, so ignore them if their format is
-         * correct. Does not count for 'Finished' MAC.
-         */
-        if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) {
-            if (s->msg_callback)
-                s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
-                                wire, DTLS1_HM_HEADER_LENGTH, s,
-                                s->msg_callback_arg);
-
-            s->init_num = 0;
-            goto redo;
-        } else {                /* Incorrectly formated Hello request */
-
-            al = SSL_AD_UNEXPECTED_MESSAGE;
-            SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,
-                   SSL_R_UNEXPECTED_MESSAGE);
-            goto f_err;
-        }
-    }
-
-    if ((al = dtls1_preprocess_fragment(s, &msg_hdr, max)))
-        goto f_err;
-
-    if (frag_len > 0) {
-        unsigned char *p =
-            (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
-
-        i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
-                                      &p[frag_off], frag_len, 0);
-
-        /*
-         * This shouldn't ever fail due to NBIO because we already checked
-         * that we have enough data in the record
-         */
-        if (i <= 0) {
-            s->rwstate = SSL_READING;
-            *ok = 0;
-            return i;
-        }
-    } else
-        i = 0;
-
-    /*
-     * XDTLS: an incorrectly formatted fragment should cause the handshake
-     * to fail
-     */
-    if (i != (int)frag_len) {
-        al = SSL3_AD_ILLEGAL_PARAMETER;
-        SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT, SSL3_AD_ILLEGAL_PARAMETER);
-        goto f_err;
-    }
-
-    *ok = 1;
-    s->state = stn;
-
-    /*
-     * Note that s->init_num is *not* used as current offset in
-     * s->init_buf->data, but as a counter summing up fragments' lengths: as
-     * soon as they sum up to handshake packet length, we assume we have got
-     * all the fragments.
-     */
-    s->init_num = frag_len;
-    return frag_len;
-
- f_err:
-    ssl3_send_alert(s, SSL3_AL_FATAL, al);
-    s->init_num = 0;
-
-    *ok = 0;
-    return (-1);
-}
-
-/*-
- * for these 2 messages, we need to
- * ssl->enc_read_ctx                    re-init
- * ssl->s3->read_sequence               zero
- * ssl->s3->read_mac_secret             re-init
- * ssl->session->read_sym_enc           assign
- * ssl->session->read_compression       assign
- * ssl->session->read_hash              assign
- */
-int dtls1_send_change_cipher_spec(SSL *s, int a, int b)
-{
-    unsigned char *p;
-
-    if (s->state == a) {
-        p = (unsigned char *)s->init_buf->data;
-        *p++ = SSL3_MT_CCS;
-        s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
-        s->init_num = DTLS1_CCS_HEADER_LENGTH;
-
-        if (s->version == DTLS1_BAD_VER) {
-            s->d1->next_handshake_write_seq++;
-            s2n(s->d1->handshake_write_seq, p);
-            s->init_num += 2;
-        }
-
-        s->init_off = 0;
-
-        dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
-                                     s->d1->handshake_write_seq, 0, 0);
-
-        /* buffer the message to handle re-xmits */
-        dtls1_buffer_message(s, 1);
-
-        s->state = b;
-    }
-
-    /* SSL3_ST_CW_CHANGE_B */
-    return (dtls1_do_write(s, SSL3_RT_CHANGE_CIPHER_SPEC));
-}
-
-int dtls1_read_failed(SSL *s, int code)
-{
-    if (code > 0) {
-        fprintf(stderr, "invalid state reached %s:%d", __FILE__, __LINE__);
-        return 1;
-    }
-
-    if (!dtls1_is_timer_expired(s)) {
-        /*
-         * not a timeout, none of our business, let higher layers handle
-         * this.  in fact it's probably an error
-         */
-        return code;
-    }
-#ifndef OPENSSL_NO_HEARTBEATS
-    /* done, no need to send a retransmit */
-    if (!SSL_in_init(s) && !s->tlsext_hb_pending)
-#else
-    /* done, no need to send a retransmit */
-    if (!SSL_in_init(s))
-#endif
-    {
-        BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ);
-        return code;
-    }
-#if 0                           /* for now, each alert contains only one
-                                 * record number */
-    item = pqueue_peek(state->rcvd_records);
-    if (item) {
-        /* send an alert immediately for all the missing records */
-    } else
-#endif
-
-#if 0                           /* no more alert sending, just retransmit the
-                                 * last set of messages */
-    if (state->timeout.read_timeouts >= DTLS1_TMO_READ_COUNT)
-        ssl3_send_alert(s, SSL3_AL_WARNING,
-                        DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
-#endif
-
-    return dtls1_handle_timeout(s);
-}
-
-int dtls1_get_queue_priority(unsigned short seq, int is_ccs)
-{
-    /*
-     * The index of the retransmission queue actually is the message sequence
-     * number, since the queue only contains messages of a single handshake.
-     * However, the ChangeCipherSpec has no message sequence number and so
-     * using only the sequence will result in the CCS and Finished having the
-     * same index. To prevent this, the sequence number is multiplied by 2.
-     * In case of a CCS 1 is subtracted. This does not only differ CSS and
-     * Finished, it also maintains the order of the index (important for
-     * priority queues) and fits in the unsigned short variable.
-     */
-    return seq * 2 - is_ccs;
-}
-
-int dtls1_retransmit_buffered_messages(SSL *s)
-{
-    pqueue sent = s->d1->sent_messages;
-    piterator iter;
-    pitem *item;
-    hm_fragment *frag;
-    int found = 0;
-
-    iter = pqueue_iterator(sent);
-
-    for (item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter)) {
-        frag = (hm_fragment *)item->data;
-        if (dtls1_retransmit_message(s, (unsigned short)
-                                     dtls1_get_queue_priority
-                                     (frag->msg_header.seq,
-                                      frag->msg_header.is_ccs), 0,
-                                     &found) <= 0 && found) {
-            fprintf(stderr, "dtls1_retransmit_message() failed\n");
-            return -1;
-        }
-    }
-
-    return 1;
-}
-
-int dtls1_buffer_message(SSL *s, int is_ccs)
-{
-    pitem *item;
-    hm_fragment *frag;
-    unsigned char seq64be[8];
-
-    /*
-     * this function is called immediately after a message has been
-     * serialized
-     */
-    OPENSSL_assert(s->init_off == 0);
-
-    frag = dtls1_hm_fragment_new(s->init_num, 0);
-    if (!frag)
-        return 0;
-
-    memcpy(frag->fragment, s->init_buf->data, s->init_num);
-
-    if (is_ccs) {
-        /* For DTLS1_BAD_VER the header length is non-standard */
-        OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
-                       ((s->version==DTLS1_BAD_VER)?3:DTLS1_CCS_HEADER_LENGTH)
-                       == (unsigned int)s->init_num);
-    } else {
-        OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
-                       DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num);
-    }
-
-    frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len;
-    frag->msg_header.seq = s->d1->w_msg_hdr.seq;
-    frag->msg_header.type = s->d1->w_msg_hdr.type;
-    frag->msg_header.frag_off = 0;
-    frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len;
-    frag->msg_header.is_ccs = is_ccs;
-
-    /* save current state */
-    frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx;
-    frag->msg_header.saved_retransmit_state.write_hash = s->write_hash;
-    frag->msg_header.saved_retransmit_state.compress = s->compress;
-    frag->msg_header.saved_retransmit_state.session = s->session;
-    frag->msg_header.saved_retransmit_state.epoch = s->d1->w_epoch;
-
-    memset(seq64be, 0, sizeof(seq64be));
-    seq64be[6] =
-        (unsigned
-         char)(dtls1_get_queue_priority(frag->msg_header.seq,
-                                        frag->msg_header.is_ccs) >> 8);
-    seq64be[7] =
-        (unsigned
-         char)(dtls1_get_queue_priority(frag->msg_header.seq,
-                                        frag->msg_header.is_ccs));
-
-    item = pitem_new(seq64be, frag);
-    if (item == NULL) {
-        dtls1_hm_fragment_free(frag);
-        return 0;
-    }
-#if 0
-    fprintf(stderr, "buffered messge: \ttype = %xx\n", msg_buf->type);
-    fprintf(stderr, "\t\t\t\t\tlen = %d\n", msg_buf->len);
-    fprintf(stderr, "\t\t\t\t\tseq_num = %d\n", msg_buf->seq_num);
-#endif
-
-    pqueue_insert(s->d1->sent_messages, item);
-    return 1;
-}
-
-int
-dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off,
-                         int *found)
-{
-    int ret;
-    /* XDTLS: for now assuming that read/writes are blocking */
-    pitem *item;
-    hm_fragment *frag;
-    unsigned long header_length;
-    unsigned char seq64be[8];
-    struct dtls1_retransmit_state saved_state;
-    unsigned char save_write_sequence[8] = {0, 0, 0, 0, 0, 0, 0, 0};
-
-    /*-
-      OPENSSL_assert(s->init_num == 0);
-      OPENSSL_assert(s->init_off == 0);
-     */
-
-    /* XDTLS:  the requested message ought to be found, otherwise error */
-    memset(seq64be, 0, sizeof(seq64be));
-    seq64be[6] = (unsigned char)(seq >> 8);
-    seq64be[7] = (unsigned char)seq;
-
-    item = pqueue_find(s->d1->sent_messages, seq64be);
-    if (item == NULL) {
-        fprintf(stderr, "retransmit:  message %d non-existant\n", seq);
-        *found = 0;
-        return 0;
-    }
-
-    *found = 1;
-    frag = (hm_fragment *)item->data;
-
-    if (frag->msg_header.is_ccs)
-        header_length = DTLS1_CCS_HEADER_LENGTH;
-    else
-        header_length = DTLS1_HM_HEADER_LENGTH;
-
-    memcpy(s->init_buf->data, frag->fragment,
-           frag->msg_header.msg_len + header_length);
-    s->init_num = frag->msg_header.msg_len + header_length;
-
-    dtls1_set_message_header_int(s, frag->msg_header.type,
-                                 frag->msg_header.msg_len,
-                                 frag->msg_header.seq, 0,
-                                 frag->msg_header.frag_len);
-
-    /* save current state */
-    saved_state.enc_write_ctx = s->enc_write_ctx;
-    saved_state.write_hash = s->write_hash;
-    saved_state.compress = s->compress;
-    saved_state.session = s->session;
-    saved_state.epoch = s->d1->w_epoch;
-    saved_state.epoch = s->d1->w_epoch;
-
-    s->d1->retransmitting = 1;
-
-    /* restore state in which the message was originally sent */
-    s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx;
-    s->write_hash = frag->msg_header.saved_retransmit_state.write_hash;
-    s->compress = frag->msg_header.saved_retransmit_state.compress;
-    s->session = frag->msg_header.saved_retransmit_state.session;
-    s->d1->w_epoch = frag->msg_header.saved_retransmit_state.epoch;
-
-    if (frag->msg_header.saved_retransmit_state.epoch ==
-        saved_state.epoch - 1) {
-        memcpy(save_write_sequence, s->s3->write_sequence,
-               sizeof(s->s3->write_sequence));
-        memcpy(s->s3->write_sequence, s->d1->last_write_sequence,
-               sizeof(s->s3->write_sequence));
-    }
-
-    ret = dtls1_do_write(s, frag->msg_header.is_ccs ?
-                         SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);
-
-    /* restore current state */
-    s->enc_write_ctx = saved_state.enc_write_ctx;
-    s->write_hash = saved_state.write_hash;
-    s->compress = saved_state.compress;
-    s->session = saved_state.session;
-    s->d1->w_epoch = saved_state.epoch;
-
-    if (frag->msg_header.saved_retransmit_state.epoch ==
-        saved_state.epoch - 1) {
-        memcpy(s->d1->last_write_sequence, s->s3->write_sequence,
-               sizeof(s->s3->write_sequence));
-        memcpy(s->s3->write_sequence, save_write_sequence,
-               sizeof(s->s3->write_sequence));
-    }
-
-    s->d1->retransmitting = 0;
-
-    (void)BIO_flush(SSL_get_wbio(s));
-    return ret;
-}
-
-unsigned char *dtls1_set_message_header(SSL *s, unsigned char *p,
-                                        unsigned char mt, unsigned long len,
-                                        unsigned long frag_off,
-                                        unsigned long frag_len)
-{
-    /* Don't change sequence numbers while listening */
-    if (frag_off == 0 && !s->d1->listen) {
-        s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
-        s->d1->next_handshake_write_seq++;
-    }
-
-    dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq,
-                                 frag_off, frag_len);
-
-    return p += DTLS1_HM_HEADER_LENGTH;
-}
-
-/* don't actually do the writing, wait till the MTU has been retrieved */
-static void
-dtls1_set_message_header_int(SSL *s, unsigned char mt,
-                             unsigned long len, unsigned short seq_num,
-                             unsigned long frag_off, unsigned long frag_len)
-{
-    struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
-
-    msg_hdr->type = mt;
-    msg_hdr->msg_len = len;
-    msg_hdr->seq = seq_num;
-    msg_hdr->frag_off = frag_off;
-    msg_hdr->frag_len = frag_len;
-}
-
-static void
-dtls1_fix_message_header(SSL *s, unsigned long frag_off,
-                         unsigned long frag_len)
-{
-    struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
-
-    msg_hdr->frag_off = frag_off;
-    msg_hdr->frag_len = frag_len;
-}
-
-static unsigned char *dtls1_write_message_header(SSL *s, unsigned char *p)
-{
-    struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
-
-    *p++ = msg_hdr->type;
-    l2n3(msg_hdr->msg_len, p);
-
-    s2n(msg_hdr->seq, p);
-    l2n3(msg_hdr->frag_off, p);
-    l2n3(msg_hdr->frag_len, p);
-
-    return p;
-}
-
-unsigned int dtls1_link_min_mtu(void)
-{
-    return (g_probable_mtu[(sizeof(g_probable_mtu) /
-                            sizeof(g_probable_mtu[0])) - 1]);
-}
-
-unsigned int dtls1_min_mtu(SSL *s)
-{
-    return dtls1_link_min_mtu() - BIO_dgram_get_mtu_overhead(SSL_get_wbio(s));
-}
-
-void
-dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr)
-{
-    memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
-    msg_hdr->type = *(data++);
-    n2l3(data, msg_hdr->msg_len);
-
-    n2s(data, msg_hdr->seq);
-    n2l3(data, msg_hdr->frag_off);
-    n2l3(data, msg_hdr->frag_len);
-}
-
-void dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr)
-{
-    memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st));
-
-    ccs_hdr->type = *(data++);
-}
-
-int dtls1_shutdown(SSL *s)
-{
-    int ret;
-#ifndef OPENSSL_NO_SCTP
-    BIO *wbio;
-
-    wbio = SSL_get_wbio(s);
-    if (wbio != NULL && BIO_dgram_is_sctp(wbio) &&
-        !(s->shutdown & SSL_SENT_SHUTDOWN)) {
-        ret = BIO_dgram_sctp_wait_for_dry(wbio);
-        if (ret < 0)
-            return -1;
-
-        if (ret == 0)
-            BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 1,
-                     NULL);
-    }
-#endif
-    ret = ssl3_shutdown(s);
-#ifndef OPENSSL_NO_SCTP
-    BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 0, NULL);
-#endif
-    return ret;
-}
-
-#ifndef OPENSSL_NO_HEARTBEATS
-int dtls1_process_heartbeat(SSL *s)
-{
-    unsigned char *p = &s->s3->rrec.data[0], *pl;
-    unsigned short hbtype;
-    unsigned int payload;
-    unsigned int padding = 16;  /* Use minimum padding */
-
-    if (s->msg_callback)
-        s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
-                        &s->s3->rrec.data[0], s->s3->rrec.length,
-                        s, s->msg_callback_arg);
-
-    /* Read type and payload length first */
-    if (1 + 2 + 16 > s->s3->rrec.length)
-        return 0;               /* silently discard */
-    if (s->s3->rrec.length > SSL3_RT_MAX_PLAIN_LENGTH)
-        return 0;               /* silently discard per RFC 6520 sec. 4 */
-
-    hbtype = *p++;
-    n2s(p, payload);
-    if (1 + 2 + payload + 16 > s->s3->rrec.length)
-        return 0;               /* silently discard per RFC 6520 sec. 4 */
-    pl = p;
-
-    if (hbtype == TLS1_HB_REQUEST) {
-        unsigned char *buffer, *bp;
-        unsigned int write_length = 1 /* heartbeat type */  +
-            2 /* heartbeat length */  +
-            payload + padding;
-        int r;
-
-        if (write_length > SSL3_RT_MAX_PLAIN_LENGTH)
-            return 0;
-
-        /*
-         * Allocate memory for the response, size is 1 byte message type,
-         * plus 2 bytes payload length, plus payload, plus padding
-         */
-        buffer = OPENSSL_malloc(write_length);
-        if (buffer == NULL)
-            return -1;
-        bp = buffer;
-
-        /* Enter response type, length and copy payload */
-        *bp++ = TLS1_HB_RESPONSE;
-        s2n(payload, bp);
-        memcpy(bp, pl, payload);
-        bp += payload;
-        /* Random padding */
-        if (RAND_bytes(bp, padding) <= 0) {
-            OPENSSL_free(buffer);
-            return -1;
-        }
-
-        r = dtls1_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, write_length);
-
-        if (r >= 0 && s->msg_callback)
-            s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
-                            buffer, write_length, s, s->msg_callback_arg);
-
-        OPENSSL_free(buffer);
-
-        if (r < 0)
-            return r;
-    } else if (hbtype == TLS1_HB_RESPONSE) {
-        unsigned int seq;
-
-        /*
-         * We only send sequence numbers (2 bytes unsigned int), and 16
-         * random bytes, so we just try to read the sequence number
-         */
-        n2s(pl, seq);
-
-        if (payload == 18 && seq == s->tlsext_hb_seq) {
-            dtls1_stop_timer(s);
-            s->tlsext_hb_seq++;
-            s->tlsext_hb_pending = 0;
-        }
-    }
-
-    return 0;
-}
-
-int dtls1_heartbeat(SSL *s)
-{
-    unsigned char *buf, *p;
-    int ret = -1;
-    unsigned int payload = 18;  /* Sequence number + random bytes */
-    unsigned int padding = 16;  /* Use minimum padding */
-
-    /* Only send if peer supports and accepts HB requests... */
-    if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
-        s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS) {
-        SSLerr(SSL_F_DTLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
-        return -1;
-    }
-
-    /* ...and there is none in flight yet... */
-    if (s->tlsext_hb_pending) {
-        SSLerr(SSL_F_DTLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PENDING);
-        return -1;
-    }
-
-    /* ...and no handshake in progress. */
-    if (SSL_in_init(s) || s->in_handshake) {
-        SSLerr(SSL_F_DTLS1_HEARTBEAT, SSL_R_UNEXPECTED_MESSAGE);
-        return -1;
-    }
-
-    /*
-     * Check if padding is too long, payload and padding must not exceed 2^14
-     * - 3 = 16381 bytes in total.
-     */
-    OPENSSL_assert(payload + padding <= 16381);
-
-    /*-
-     * Create HeartBeat message, we just use a sequence number
-     * as payload to distuingish different messages and add
-     * some random stuff.
-     *  - Message Type, 1 byte
-     *  - Payload Length, 2 bytes (unsigned int)
-     *  - Payload, the sequence number (2 bytes uint)
-     *  - Payload, random bytes (16 bytes uint)
-     *  - Padding
-     */
-    buf = OPENSSL_malloc(1 + 2 + payload + padding);
-    if (buf == NULL)
-        goto err;
-    p = buf;
-    /* Message Type */
-    *p++ = TLS1_HB_REQUEST;
-    /* Payload length (18 bytes here) */
-    s2n(payload, p);
-    /* Sequence number */
-    s2n(s->tlsext_hb_seq, p);
-    /* 16 random bytes */
-    if (RAND_bytes(p, 16) <= 0)
-        goto err;
-    p += 16;
-    /* Random padding */
-    if (RAND_bytes(p, padding) <= 0)
-        goto err;
-
-    ret = dtls1_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
-    if (ret >= 0) {
-        if (s->msg_callback)
-            s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
-                            buf, 3 + payload + padding,
-                            s, s->msg_callback_arg);
-
-        dtls1_start_timer(s);
-        s->tlsext_hb_pending = 1;
-    }
-
-err:
-    OPENSSL_free(buf);
-
-    return ret;
-}
-#endif