text: /* apps/s_cb.c - callback functions used by s_client, s_server, and s_time */
  /* 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.]
   */
  /* ====================================================================
   * Copyright (c) 1998-2006 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 <stdlib.h>
  #define USE_SOCKETS
  #define NON_MAIN
  #include "apps.h"
  #undef NON_MAIN
  #undef USE_SOCKETS
  #include <openssl/err.h>
  #include <openssl/rand.h>
  #include <openssl/x509.h>
  #include <openssl/ssl.h>
  #include "s_apps.h"
  
  #define	COOKIE_SECRET_LENGTH	16
  
  int verify_depth=0;
  int verify_error=X509_V_OK;
  int verify_return_error=0;
  unsigned char cookie_secret[COOKIE_SECRET_LENGTH];
  int cookie_initialized=0;
  
  int MS_CALLBACK verify_callback(int ok, X509_STORE_CTX *ctx)
  	{
  	X509 *err_cert;
  	int err,depth;
  
  	err_cert=X509_STORE_CTX_get_current_cert(ctx);
  	err=	X509_STORE_CTX_get_error(ctx);
  	depth=	X509_STORE_CTX_get_error_depth(ctx);
  
  	BIO_printf(bio_err,"depth=%d ",depth);
  	if (err_cert)
  		{
  		X509_NAME_print_ex(bio_err, X509_get_subject_name(err_cert),
  					0, XN_FLAG_ONELINE);
  		BIO_puts(bio_err, "\n");
  		}
  	else
  		BIO_puts(bio_err, "<no cert>\n");
  	if (!ok)
  		{
  		BIO_printf(bio_err,"verify error:num=%d:%s\n",err,
  			X509_verify_cert_error_string(err));
  		if (verify_depth >= depth)
  			{
  			if (!verify_return_error)
  				ok=1;
  			verify_error=X509_V_OK;
  			}
  		else
  			{
  			ok=0;
  			verify_error=X509_V_ERR_CERT_CHAIN_TOO_LONG;
  			}
  		}
  	switch (err)
  		{
  	case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
  		BIO_puts(bio_err,"issuer= ");
  		X509_NAME_print_ex(bio_err, X509_get_issuer_name(err_cert),
  					0, XN_FLAG_ONELINE);
  		BIO_puts(bio_err, "\n");
  		break;
  	case X509_V_ERR_CERT_NOT_YET_VALID:
  	case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
  		BIO_printf(bio_err,"notBefore=");
  		ASN1_TIME_print(bio_err,X509_get_notBefore(err_cert));
  		BIO_printf(bio_err,"\n");
  		break;
  	case X509_V_ERR_CERT_HAS_EXPIRED:
  	case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
  		BIO_printf(bio_err,"notAfter=");
  		ASN1_TIME_print(bio_err,X509_get_notAfter(err_cert));
  		BIO_printf(bio_err,"\n");
  		break;
  	case X509_V_ERR_NO_EXPLICIT_POLICY:
  		policies_print(bio_err, ctx);
  		break;
  		}
  	if (err == X509_V_OK && ok == 2)
  		policies_print(bio_err, ctx);
  
  	BIO_printf(bio_err,"verify return:%d\n",ok);
  	return(ok);
  	}
  
  int set_cert_stuff(SSL_CTX *ctx, char *cert_file, char *key_file)
  	{
  	if (cert_file != NULL)
  		{
  		/*
  		SSL *ssl;
  		X509 *x509;
  		*/
  
  		if (SSL_CTX_use_certificate_file(ctx,cert_file,
  			SSL_FILETYPE_PEM) <= 0)
  			{
  			BIO_printf(bio_err,"unable to get certificate from '%s'\n",cert_file);
  			ERR_print_errors(bio_err);
  			return(0);
  			}
  		if (key_file == NULL) key_file=cert_file;
  		if (SSL_CTX_use_PrivateKey_file(ctx,key_file,
  			SSL_FILETYPE_PEM) <= 0)
  			{
  			BIO_printf(bio_err,"unable to get private key from '%s'\n",key_file);
  			ERR_print_errors(bio_err);
  			return(0);
  			}
  
  		/*
  		In theory this is no longer needed 
  		ssl=SSL_new(ctx);
  		x509=SSL_get_certificate(ssl);
  
  		if (x509 != NULL) {
  			EVP_PKEY *pktmp;
  			pktmp = X509_get_pubkey(x509);
  			EVP_PKEY_copy_parameters(pktmp,
  						SSL_get_privatekey(ssl));
  			EVP_PKEY_free(pktmp);
  		}
  		SSL_free(ssl);
  		*/
  
  		/* If we are using DSA, we can copy the parameters from
  		 * the private key */
  		
  		
  		/* Now we know that a key and cert have been set against
  		 * the SSL context */
  		if (!SSL_CTX_check_private_key(ctx))
  			{
  			BIO_printf(bio_err,"Private key does not match the certificate public key\n");
  			return(0);
  			}
  		}
  	return(1);
  	}
  
  int set_cert_key_stuff(SSL_CTX *ctx, X509 *cert, EVP_PKEY *key)
  	{
  	if (cert ==  NULL)
  		return 1;
  	if (SSL_CTX_use_certificate(ctx,cert) <= 0)
  		{
  		BIO_printf(bio_err,"error setting certificate\n");
  		ERR_print_errors(bio_err);
  		return 0;
  		}
  	if (SSL_CTX_use_PrivateKey(ctx,key) <= 0)
  		{
  		BIO_printf(bio_err,"error setting private key\n");
  		ERR_print_errors(bio_err);
  		return 0;
  		}
  
  		
  		/* Now we know that a key and cert have been set against
  		 * the SSL context */
  	if (!SSL_CTX_check_private_key(ctx))
  		{
  		BIO_printf(bio_err,"Private key does not match the certificate public key\n");
  		return 0;
  		}
  	return 1;
  	}
  
  long MS_CALLBACK bio_dump_callback(BIO *bio, int cmd, const char *argp,
  				   int argi, long argl, long ret)
  	{
  	BIO *out;
  
  	out=(BIO *)BIO_get_callback_arg(bio);
  	if (out == NULL) return(ret);
  
  	if (cmd == (BIO_CB_READ|BIO_CB_RETURN))
  		{
  		BIO_printf(out,"read from %p [%p] (%lu bytes => %ld (0x%lX))\n",
   			(void *)bio,argp,(unsigned long)argi,ret,ret);
  		BIO_dump(out,argp,(int)ret);
  		return(ret);
  		}
  	else if (cmd == (BIO_CB_WRITE|BIO_CB_RETURN))
  		{
  		BIO_printf(out,"write to %p [%p] (%lu bytes => %ld (0x%lX))\n",
  			(void *)bio,argp,(unsigned long)argi,ret,ret);
  		BIO_dump(out,argp,(int)ret);
  		}
  	return(ret);
  	}
  
  void MS_CALLBACK apps_ssl_info_callback(const SSL *s, int where, int ret)
  	{
  	const char *str;
  	int w;
  
  	w=where& ~SSL_ST_MASK;
  
  	if (w & SSL_ST_CONNECT) str="SSL_connect";
  	else if (w & SSL_ST_ACCEPT) str="SSL_accept";
  	else str="undefined";
  
  	if (where & SSL_CB_LOOP)
  		{
  		BIO_printf(bio_err,"%s:%s\n",str,SSL_state_string_long(s));
  		}
  	else if (where & SSL_CB_ALERT)
  		{
  		str=(where & SSL_CB_READ)?"read":"write";
  		BIO_printf(bio_err,"SSL3 alert %s:%s:%s\n",
  			str,
  			SSL_alert_type_string_long(ret),
  			SSL_alert_desc_string_long(ret));
  		}
  	else if (where & SSL_CB_EXIT)
  		{
  		if (ret == 0)
  			BIO_printf(bio_err,"%s:failed in %s\n",
  				str,SSL_state_string_long(s));
  		else if (ret < 0)
  			{
  			BIO_printf(bio_err,"%s:error in %s\n",
  				str,SSL_state_string_long(s));
  			}
  		}
  	}
  
  
  void MS_CALLBACK msg_cb(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg)
  	{
  	BIO *bio = arg;
  	const char *str_write_p, *str_version, *str_content_type = "", *str_details1 = "", *str_details2= "";
  	
  	str_write_p = write_p ? ">>>" : "<<<";
  
  	switch (version)
  		{
  	case SSL2_VERSION:
  		str_version = "SSL 2.0";
  		break;
  	case SSL3_VERSION:
  		str_version = "SSL 3.0 ";
  		break;
  	case TLS1_VERSION:
  		str_version = "TLS 1.0 ";
  		break;
  	case DTLS1_VERSION:
  		str_version = "DTLS 1.0 ";
  		break;
  	case DTLS1_BAD_VER:
  		str_version = "DTLS 1.0 (bad) ";
  		break;
  	default:
  		str_version = "???";
  		}
  
  	if (version == SSL2_VERSION)
  		{
  		str_details1 = "???";
  
  		if (len > 0)
  			{
  			switch (((const unsigned char*)buf)[0])
  				{
  				case 0:
  					str_details1 = ", ERROR:";
  					str_details2 = " ???";
  					if (len >= 3)
  						{
  						unsigned err = (((const unsigned char*)buf)[1]<<8) + ((const unsigned char*)buf)[2];
  						
  						switch (err)
  							{
  						case 0x0001:
  							str_details2 = " NO-CIPHER-ERROR";
  							break;
  						case 0x0002:
  							str_details2 = " NO-CERTIFICATE-ERROR";
  							break;
  						case 0x0004:
  							str_details2 = " BAD-CERTIFICATE-ERROR";
  							break;
  						case 0x0006:
  							str_details2 = " UNSUPPORTED-CERTIFICATE-TYPE-ERROR";
  							break;
  							}
  						}
  
  					break;
  				case 1:
  					str_details1 = ", CLIENT-HELLO";
  					break;
  				case 2:
  					str_details1 = ", CLIENT-MASTER-KEY";
  					break;
  				case 3:
  					str_details1 = ", CLIENT-FINISHED";
  					break;
  				case 4:
  					str_details1 = ", SERVER-HELLO";
  					break;
  				case 5:
  					str_details1 = ", SERVER-VERIFY";
  					break;
  				case 6:
  					str_details1 = ", SERVER-FINISHED";
  					break;
  				case 7:
  					str_details1 = ", REQUEST-CERTIFICATE";
  					break;
  				case 8:
  					str_details1 = ", CLIENT-CERTIFICATE";
  					break;
  				}
  			}
  		}
  
  	if (version == SSL3_VERSION ||
  	    version == TLS1_VERSION ||
  	    version == DTLS1_VERSION ||
  	    version == DTLS1_BAD_VER)
  		{
  		switch (content_type)
  			{
  		case 20:
  			str_content_type = "ChangeCipherSpec";
  			break;
  		case 21:
  			str_content_type = "Alert";
  			break;
  		case 22:
  			str_content_type = "Handshake";
  			break;
  			}
  
  		if (content_type == 21) /* Alert */
  			{
  			str_details1 = ", ???";
  			
  			if (len == 2)
  				{
  				switch (((const unsigned char*)buf)[0])
  					{
  				case 1:
  					str_details1 = ", warning";
  					break;
  				case 2:
  					str_details1 = ", fatal";
  					break;
  					}
  
  				str_details2 = " ???";
  				switch (((const unsigned char*)buf)[1])
  					{
  				case 0:
  					str_details2 = " close_notify";
  					break;
  				case 10:
  					str_details2 = " unexpected_message";
  					break;
  				case 20:
  					str_details2 = " bad_record_mac";
  					break;
  				case 21:
  					str_details2 = " decryption_failed";
  					break;
  				case 22:
  					str_details2 = " record_overflow";
  					break;
  				case 30:
  					str_details2 = " decompression_failure";
  					break;
  				case 40:
  					str_details2 = " handshake_failure";
  					break;
  				case 42:
  					str_details2 = " bad_certificate";
  					break;
  				case 43:
  					str_details2 = " unsupported_certificate";
  					break;
  				case 44:
  					str_details2 = " certificate_revoked";
  					break;
  				case 45:
  					str_details2 = " certificate_expired";
  					break;
  				case 46:
  					str_details2 = " certificate_unknown";
  					break;
  				case 47:
  					str_details2 = " illegal_parameter";
  					break;
  				case 48:
  					str_details2 = " unknown_ca";
  					break;
  				case 49:
  					str_details2 = " access_denied";
  					break;
  				case 50:
  					str_details2 = " decode_error";
  					break;
  				case 51:
  					str_details2 = " decrypt_error";
  					break;
  				case 60:
  					str_details2 = " export_restriction";
  					break;
  				case 70:
  					str_details2 = " protocol_version";
  					break;
  				case 71:
  					str_details2 = " insufficient_security";
  					break;
  				case 80:
  					str_details2 = " internal_error";
  					break;
  				case 90:
  					str_details2 = " user_canceled";
  					break;
  				case 100:
  					str_details2 = " no_renegotiation";
  					break;
  				case 110:
  					str_details2 = " unsupported_extension";
  					break;
  				case 111:
  					str_details2 = " certificate_unobtainable";
  					break;
  				case 112:
  					str_details2 = " unrecognized_name";
  					break;
  				case 113:
  					str_details2 = " bad_certificate_status_response";
  					break;
  				case 114:
  					str_details2 = " bad_certificate_hash_value";
  					break;
  					}
  				}
  			}
  		
  		if (content_type == 22) /* Handshake */
  			{
  			str_details1 = "???";
  
  			if (len > 0)
  				{
  				switch (((const unsigned char*)buf)[0])
  					{
  				case 0:
  					str_details1 = ", HelloRequest";
  					break;
  				case 1:
  					str_details1 = ", ClientHello";
  					break;
  				case 2:
  					str_details1 = ", ServerHello";
  					break;
  				case 3:
  					str_details1 = ", HelloVerifyRequest";
  					break;
  				case 11:
  					str_details1 = ", Certificate";
  					break;
  				case 12:
  					str_details1 = ", ServerKeyExchange";
  					break;
  				case 13:
  					str_details1 = ", CertificateRequest";
  					break;
  				case 14:
  					str_details1 = ", ServerHelloDone";
  					break;
  				case 15:
  					str_details1 = ", CertificateVerify";
  					break;
  				case 16:
  					str_details1 = ", ClientKeyExchange";
  					break;
  				case 20:
  					str_details1 = ", Finished";
  					break;
  					}
  				}
  			}
  		}
  
  	BIO_printf(bio, "%s %s%s [length %04lx]%s%s\n", str_write_p, str_version, str_content_type, (unsigned long)len, str_details1, str_details2);
  
  	if (len > 0)
  		{
  		size_t num, i;
  		
  		BIO_printf(bio, "   ");
  		num = len;
  #if 0
  		if (num > 16)
  			num = 16;
  #endif
  		for (i = 0; i < num; i++)
  			{
  			if (i % 16 == 0 && i > 0)
  				BIO_printf(bio, "\n   ");
  			BIO_printf(bio, " %02x", ((const unsigned char*)buf)[i]);
  			}
  		if (i < len)
  			BIO_printf(bio, " ...");
  		BIO_printf(bio, "\n");
  		}
  	(void)BIO_flush(bio);
  	}
  
  void MS_CALLBACK tlsext_cb(SSL *s, int client_server, int type,
  					unsigned char *data, int len,
  					void *arg)
  	{
  	BIO *bio = arg;
  	char *extname;
  
  	switch(type)
  		{
  		case TLSEXT_TYPE_server_name:
  		extname = "server name";
  		break;
  
  		case TLSEXT_TYPE_max_fragment_length:
  		extname = "max fragment length";
  		break;
  
  		case TLSEXT_TYPE_client_certificate_url:
  		extname = "client certificate URL";
  		break;
  
  		case TLSEXT_TYPE_trusted_ca_keys:
  		extname = "trusted CA keys";
  		break;
  
  		case TLSEXT_TYPE_truncated_hmac:
  		extname = "truncated HMAC";
  		break;
  
  		case TLSEXT_TYPE_status_request:
  		extname = "status request";
  		break;
  
  		case TLSEXT_TYPE_elliptic_curves:
  		extname = "elliptic curves";
  		break;
  
  		case TLSEXT_TYPE_ec_point_formats:
  		extname = "EC point formats";
  		break;
  
  		case TLSEXT_TYPE_session_ticket:
  		extname = "server ticket";
  		break;
  
  		case TLSEXT_TYPE_renegotiate:
  		extname = "renegotiate";
  		break;
  
  #ifdef TLSEXT_TYPE_opaque_prf_input
  		case TLSEXT_TYPE_opaque_prf_input:
  		extname = "opaque PRF input";
  		break;
  #endif
  
  		default:
  		extname = "unknown";
  		break;
  
  		}
  	
  	BIO_printf(bio, "TLS %s extension \"%s\" (id=%d), len=%d\n",
  			client_server ? "server": "client",
  			extname, type, len);
  	BIO_dump(bio, (char *)data, len);
  	(void)BIO_flush(bio);
  	}
  
  int MS_CALLBACK generate_cookie_callback(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len)
  	{
  	unsigned char *buffer, result[EVP_MAX_MD_SIZE];
  	unsigned int length, resultlength;
  	union {
  		struct sockaddr sa;
  		struct sockaddr_in s4;
  #if OPENSSL_USE_IPV6
  		struct sockaddr_in6 s6;
  #endif
  	} peer;
  
  	/* Initialize a random secret */
  	if (!cookie_initialized)
  		{
  		if (!RAND_bytes(cookie_secret, COOKIE_SECRET_LENGTH))
  			{
  			BIO_printf(bio_err,"error setting random cookie secret\n");
  			return 0;
  			}
  		cookie_initialized = 1;
  		}
  
  	/* Read peer information */
  	(void)BIO_dgram_get_peer(SSL_get_rbio(ssl), &peer);
  
  	/* Create buffer with peer's address and port */
  	length = 0;
  	switch (peer.sa.sa_family)
  		{
  	case AF_INET:
  		length += sizeof(struct in_addr);
  		length += sizeof(peer.s4.sin_port);
  		break;
  #if OPENSSL_USE_IPV6
  	case AF_INET6:
  		length += sizeof(struct in6_addr);
  		length += sizeof(peer.s6.sin6_port);
  		break;
  #endif
  	default:
  		OPENSSL_assert(0);
  		break;
  		}
  	buffer = OPENSSL_malloc(length);
  
  	if (buffer == NULL)
  		{
  		BIO_printf(bio_err,"out of memory\n");
  		return 0;
  		}
  
  	switch (peer.sa.sa_family)
  		{
  	case AF_INET:
  		memcpy(buffer,
  		       &peer.s4.sin_port,
  		       sizeof(peer.s4.sin_port));
  		memcpy(buffer + sizeof(peer.s4.sin_port),
  		       &peer.s4.sin_addr,
  		       sizeof(struct in_addr));
  		break;
  #if OPENSSL_USE_IPV6
  	case AF_INET6:
  		memcpy(buffer,
  		       &peer.s6.sin6_port,
  		       sizeof(peer.s6.sin6_port));
  		memcpy(buffer + sizeof(peer.s6.sin6_port),
  		       &peer.s6.sin6_addr,
  		       sizeof(struct in6_addr));
  		break;
  #endif
  	default:
  		OPENSSL_assert(0);
  		break;
  		}
  
  	/* Calculate HMAC of buffer using the secret */
  	HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
  	     buffer, length, result, &resultlength);
  	OPENSSL_free(buffer);
  
  	memcpy(cookie, result, resultlength);
  	*cookie_len = resultlength;
  
  	return 1;
  	}
  
  int MS_CALLBACK verify_cookie_callback(SSL *ssl, unsigned char *cookie, unsigned int cookie_len)
  	{
  	unsigned char *buffer, result[EVP_MAX_MD_SIZE];
  	unsigned int length, resultlength;
  	union {
  		struct sockaddr sa;
  		struct sockaddr_in s4;
  #if OPENSSL_USE_IPV6
  		struct sockaddr_in6 s6;
  #endif
  	} peer;
  
  	/* If secret isn't initialized yet, the cookie can't be valid */
  	if (!cookie_initialized)
  		return 0;
  
  	/* Read peer information */
  	(void)BIO_dgram_get_peer(SSL_get_rbio(ssl), &peer);
  
  	/* Create buffer with peer's address and port */
  	length = 0;
  	switch (peer.sa.sa_family)
  		{
  	case AF_INET:
  		length += sizeof(struct in_addr);
  		length += sizeof(peer.s4.sin_port);
  		break;
  #if OPENSSL_USE_IPV6
  	case AF_INET6:
  		length += sizeof(struct in6_addr);
  		length += sizeof(peer.s6.sin6_port);
  		break;
  #endif
  	default:
  		OPENSSL_assert(0);
  		break;
  		}
  	buffer = OPENSSL_malloc(length);
  	
  	if (buffer == NULL)
  		{
  		BIO_printf(bio_err,"out of memory\n");
  		return 0;
  		}
  
  	switch (peer.sa.sa_family)
  		{
  	case AF_INET:
  		memcpy(buffer,
  		       &peer.s4.sin_port,
  		       sizeof(peer.s4.sin_port));
  		memcpy(buffer + sizeof(peer.s4.sin_port),
  		       &peer.s4.sin_addr,
  		       sizeof(struct in_addr));
  		break;
  #if OPENSSL_USE_IPV6
  	case AF_INET6:
  		memcpy(buffer,
  		       &peer.s6.sin6_port,
  		       sizeof(peer.s6.sin6_port));
  		memcpy(buffer + sizeof(peer.s6.sin6_port),
  		       &peer.s6.sin6_addr,
  		       sizeof(struct in6_addr));
  		break;
  #endif
  	default:
  		OPENSSL_assert(0);
  		break;
  		}
  
  	/* Calculate HMAC of buffer using the secret */
  	HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
  	     buffer, length, result, &resultlength);
  	OPENSSL_free(buffer);
  
  	if (cookie_len == resultlength && memcmp(result, cookie, resultlength) == 0)
  		return 1;
  
  	return 0;
  	}
  