text: /* ssl/d1_lib.c */
  /* 
   * DTLS implementation written by Nagendra Modadugu
   * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.  
   */
  /* ====================================================================
   * Copyright (c) 1999-2005 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).
   *
   */
  
  #include <stdio.h>
  #include <openssl/objects.h>
  #include "ssl_locl.h"
  
  const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;
  
  SSL3_ENC_METHOD DTLSv1_enc_data={
      dtls1_enc,
  	tls1_mac,
  	tls1_setup_key_block,
  	tls1_generate_master_secret,
  	tls1_change_cipher_state,
  	tls1_final_finish_mac,
  	TLS1_FINISH_MAC_LENGTH,
  	tls1_cert_verify_mac,
  	TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
  	TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
  	tls1_alert_code,
  	};
  
  long dtls1_default_timeout(void)
  	{
  	/* 2 hours, the 24 hours mentioned in the DTLSv1 spec
  	 * is way too long for http, the cache would over fill */
  	return(60*60*2);
  	}
  
  IMPLEMENT_dtls1_meth_func(dtlsv1_base_method,
  			ssl_undefined_function,
  			ssl_undefined_function,
  			ssl_bad_method)
  
  int dtls1_new(SSL *s)
  	{
  	DTLS1_STATE *d1;
  
  	if (!ssl3_new(s)) return(0);
  	if ((d1=OPENSSL_malloc(sizeof *d1)) == NULL) return (0);
  	memset(d1,0, sizeof *d1);
  
  	/* d1->handshake_epoch=0; */
  #if defined(OPENSSL_SYS_VMS) || defined(VMS_TEST)
  	d1->bitmap.length=64;
  #else
  	d1->bitmap.length=sizeof(d1->bitmap.map) * 8;
  #endif
  	pq_64bit_init(&(d1->bitmap.map));
  	pq_64bit_init(&(d1->bitmap.max_seq_num));
  	
  	d1->next_bitmap.length = d1->bitmap.length;
  	pq_64bit_init(&(d1->next_bitmap.map));
  	pq_64bit_init(&(d1->next_bitmap.max_seq_num));
  
  	d1->unprocessed_rcds.q=pqueue_new();
  	d1->processed_rcds.q=pqueue_new();
  	d1->buffered_messages = pqueue_new();
  	d1->sent_messages=pqueue_new();
  
  	if ( s->server)
  		{
  		d1->cookie_len = sizeof(s->d1->cookie);
  		}
  
  	if( ! d1->unprocessed_rcds.q || ! d1->processed_rcds.q 
          || ! d1->buffered_messages || ! d1->sent_messages)
  		{
          if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q);
          if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q);
          if ( d1->buffered_messages) pqueue_free(d1->buffered_messages);
  		if ( d1->sent_messages) pqueue_free(d1->sent_messages);
  		OPENSSL_free(d1);
  		return (0);
  		}
  
  	s->d1=d1;
  	s->method->ssl_clear(s);
  	return(1);
  	}
  
  void dtls1_free(SSL *s)
  	{
      pitem *item = NULL;
      hm_fragment *frag = NULL;
  
  	ssl3_free(s);
  
      while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL)
          {
          OPENSSL_free(item->data);
          pitem_free(item);
          }
      pqueue_free(s->d1->unprocessed_rcds.q);
  
      while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL)
          {
          OPENSSL_free(item->data);
          pitem_free(item);
          }
      pqueue_free(s->d1->processed_rcds.q);
  
      while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL)
          {
          frag = (hm_fragment *)item->data;
          OPENSSL_free(frag->fragment);
          OPENSSL_free(frag);
          pitem_free(item);
          }
      pqueue_free(s->d1->buffered_messages);
  
      while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
          {
          frag = (hm_fragment *)item->data;
          OPENSSL_free(frag->fragment);
          OPENSSL_free(frag);
          pitem_free(item);
          }
  	pqueue_free(s->d1->sent_messages);
  
  	pq_64bit_free(&(s->d1->bitmap.map));
  	pq_64bit_free(&(s->d1->bitmap.max_seq_num));
  
  	pq_64bit_free(&(s->d1->next_bitmap.map));
  	pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
  
  	OPENSSL_free(s->d1);
  	}
  
  void dtls1_clear(SSL *s)
  	{
  	ssl3_clear(s);
  	s->version=DTLS1_VERSION;
  	}
  
  /*
   * As it's impossible to use stream ciphers in "datagram" mode, this
   * simple filter is designed to disengage them in DTLS. Unfortunately
   * there is no universal way to identify stream SSL_CIPHER, so we have
   * to explicitly list their SSL_* codes. Currently RC4 is the only one
   * available, but if new ones emerge, they will have to be added...
   */
  SSL_CIPHER *dtls1_get_cipher(unsigned int u)
  	{
  	SSL_CIPHER *ciph = ssl3_get_cipher(u);
  
  	if (ciph != NULL)
  		{
  		if ((ciph->algorithms&SSL_ENC_MASK) == SSL_RC4)
  			return NULL;
  		}
  
  	return ciph;
  	}
  