Updates to s_client and s_server to remove the constant 28 (for IPv4 header

[openssl.git] / apps / s_server.c

/* apps/s_server.c */
/* 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).
 *
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * ECC cipher suite support in OpenSSL originally developed by 
 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 */
/* ====================================================================
 * Copyright 2005 Nokia. All rights reserved.
 *
 * The portions of the attached software ("Contribution") is developed by
 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 * license.
 *
 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 * support (see RFC 4279) to OpenSSL.
 *
 * No patent licenses or other rights except those expressly stated in
 * the OpenSSL open source license shall be deemed granted or received
 * expressly, by implication, estoppel, or otherwise.
 *
 * No assurances are provided by Nokia that the Contribution does not
 * infringe the patent or other intellectual property rights of any third
 * party or that the license provides you with all the necessary rights
 * to make use of the Contribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 * OTHERWISE.
 */

/* Until the key-gen callbacks are modified to use newer prototypes, we allow
 * deprecated functions for openssl-internal code */
#ifdef OPENSSL_NO_DEPRECATED
#undef OPENSSL_NO_DEPRECATED
#endif

#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <openssl/e_os2.h>
#ifdef OPENSSL_NO_STDIO
#define APPS_WIN16
#endif

#if !defined(OPENSSL_SYS_NETWARE)  /* conflicts with winsock2 stuff on netware */
#include <sys/types.h>
#endif

/* With IPv6, it looks like Digital has mixed up the proper order of
   recursive header file inclusion, resulting in the compiler complaining
   that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which
   is needed to have fileno() declared correctly...  So let's define u_int */
#if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
#define __U_INT
typedef unsigned int u_int;
#endif

#include <openssl/lhash.h>
#include <openssl/bn.h>
#define USE_SOCKETS
#include "apps.h"
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/x509.h>
#include <openssl/ssl.h>
#include <openssl/rand.h>
#include <openssl/ocsp.h>
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif
#ifndef OPENSSL_NO_RSA
#include <openssl/rsa.h>
#endif
#ifndef OPENSSL_NO_SRP
#include <openssl/srp.h>
#endif
#include "s_apps.h"
#include "timeouts.h"

#if (defined(OPENSSL_SYS_VMS) && __VMS_VER < 70000000)
/* FIONBIO used as a switch to enable ioctl, and that isn't in VMS < 7.0 */
#undef FIONBIO
#endif

#if defined(OPENSSL_SYS_BEOS_R5)
#include <fcntl.h>
#endif

#ifndef OPENSSL_NO_RSA
static RSA MS_CALLBACK *tmp_rsa_cb(SSL *s, int is_export, int keylength);
#endif
static int not_resumable_sess_cb(SSL *s, int is_forward_secure);
static int sv_body(char *hostname, int s, int stype, unsigned char *context);
static int www_body(char *hostname, int s, int stype, unsigned char *context);
static int rev_body(char *hostname, int s, int stype, unsigned char *context);
static void close_accept_socket(void );
static void sv_usage(void);
static int init_ssl_connection(SSL *s);
static void print_stats(BIO *bp,SSL_CTX *ctx);
static int generate_session_id(const SSL *ssl, unsigned char *id,
                                unsigned int *id_len);
static void init_session_cache_ctx(SSL_CTX *sctx);
static void free_sessions(void);
#ifndef OPENSSL_NO_DH
static DH *load_dh_param(const char *dhfile);
#endif

#ifdef MONOLITH
static void s_server_init(void);
#endif

/* static int load_CA(SSL_CTX *ctx, char *file);*/

#undef BUFSIZZ
#define BUFSIZZ 16*1024
static int bufsize=BUFSIZZ;
static int accept_socket= -1;

#define TEST_CERT       "server.pem"
#ifndef OPENSSL_NO_TLSEXT
#define TEST_CERT2      "server2.pem"
#endif
#undef PROG
#define PROG            s_server_main

extern int verify_depth, verify_return_error, verify_quiet;

static int s_server_verify=SSL_VERIFY_NONE;
static int s_server_session_id_context = 1; /* anything will do */
static const char *s_cert_file=TEST_CERT,*s_key_file=NULL, *s_chain_file=NULL;
#ifndef OPENSSL_NO_TLSEXT
static const char *s_cert_file2=TEST_CERT2,*s_key_file2=NULL;
#endif
static char *s_dcert_file=NULL,*s_dkey_file=NULL, *s_dchain_file=NULL;
#ifdef FIONBIO
static int s_nbio=0;
#endif
static int s_nbio_test=0;
int s_crlf=0;
static SSL_CTX *ctx=NULL;
#ifndef OPENSSL_NO_TLSEXT
static SSL_CTX *ctx2=NULL;
#endif
static int www=0;

static BIO *bio_s_out=NULL;
static BIO *bio_s_msg = NULL;
static int s_debug=0;
#ifndef OPENSSL_NO_TLSEXT
static int s_tlsextdebug=0;
static int s_tlsextstatus=0;
static int cert_status_cb(SSL *s, void *arg);
#endif
static int no_resume_ephemeral = 0;
static int s_msg=0;
static int s_quiet=0;
static int s_ign_eof=0;
static int s_brief=0;

static char *keymatexportlabel=NULL;
static int keymatexportlen=20;

static int hack=0;
#ifndef OPENSSL_NO_ENGINE
static char *engine_id=NULL;
#endif
static const char *session_id_prefix=NULL;

static int enable_timeouts = 0;
static long socket_mtu;
#ifndef OPENSSL_NO_DTLS1
static int cert_chain = 0;
#endif

#ifndef OPENSSL_NO_TLSEXT
static BIO *serverinfo_in = NULL;
static const char *s_serverinfo_file = NULL;

#endif

#ifndef OPENSSL_NO_PSK
static char *psk_identity="Client_identity";
char *psk_key=NULL; /* by default PSK is not used */

static unsigned int psk_server_cb(SSL *ssl, const char *identity,
        unsigned char *psk, unsigned int max_psk_len)
        {
        unsigned int psk_len = 0;
        int ret;
        BIGNUM *bn = NULL;

        if (s_debug)
                BIO_printf(bio_s_out,"psk_server_cb\n");
        if (!identity)
                {
                BIO_printf(bio_err,"Error: client did not send PSK identity\n");
                goto out_err;
                }
        if (s_debug)
                BIO_printf(bio_s_out,"identity_len=%d identity=%s\n",
                        identity ? (int)strlen(identity) : 0, identity);

        /* here we could lookup the given identity e.g. from a database */
        if (strcmp(identity, psk_identity) != 0)
                {
                BIO_printf(bio_s_out, "PSK error: client identity not found"
                           " (got '%s' expected '%s')\n", identity,
                           psk_identity);
                goto out_err;
                }
        if (s_debug)
                BIO_printf(bio_s_out, "PSK client identity found\n");

        /* convert the PSK key to binary */
        ret = BN_hex2bn(&bn, psk_key);
        if (!ret)
                {
                BIO_printf(bio_err,"Could not convert PSK key '%s' to BIGNUM\n", psk_key);
                if (bn)
                        BN_free(bn);
                return 0;
                }
        if (BN_num_bytes(bn) > (int)max_psk_len)
                {
                BIO_printf(bio_err,"psk buffer of callback is too small (%d) for key (%d)\n",
                        max_psk_len, BN_num_bytes(bn));
                BN_free(bn);
                return 0;
                }

        ret = BN_bn2bin(bn, psk);
        BN_free(bn);

        if (ret < 0)
                goto out_err;
        psk_len = (unsigned int)ret;

        if (s_debug)
                BIO_printf(bio_s_out, "fetched PSK len=%d\n", psk_len);
        return psk_len;
 out_err:
        if (s_debug)
                BIO_printf(bio_err, "Error in PSK server callback\n");
        return 0;
        }
#endif

#ifndef OPENSSL_NO_SRP
/* This is a context that we pass to callbacks */
typedef struct srpsrvparm_st
        {
        char *login;
        SRP_VBASE *vb;
        SRP_user_pwd *user;
        } srpsrvparm;

/* This callback pretends to require some asynchronous logic in order to obtain
   a verifier. When the callback is called for a new connection we return
   with a negative value. This will provoke the accept etc to return with
   an LOOKUP_X509. The main logic of the reinvokes the suspended call 
   (which would normally occur after a worker has finished) and we
   set the user parameters. 
*/
static int MS_CALLBACK ssl_srp_server_param_cb(SSL *s, int *ad, void *arg)
        {
        srpsrvparm *p = (srpsrvparm *)arg;
        if (p->login == NULL && p->user == NULL )
                {
                p->login = SSL_get_srp_username(s);
                BIO_printf(bio_err, "SRP username = \"%s\"\n", p->login);
                return (-1) ;
                }

        if (p->user == NULL)
                {
                BIO_printf(bio_err, "User %s doesn't exist\n", p->login);
                return SSL3_AL_FATAL;
                }
        if (SSL_set_srp_server_param(s, p->user->N, p->user->g, p->user->s, p->user->v,
                                     p->user->info) < 0)
                {
                *ad = SSL_AD_INTERNAL_ERROR;
                return SSL3_AL_FATAL;
                }
        BIO_printf(bio_err, "SRP parameters set: username = \"%s\" info=\"%s\" \n", p->login,p->user->info);
        /* need to check whether there are memory leaks */
        p->user = NULL;
        p->login = NULL;
        return SSL_ERROR_NONE;
        }

#endif

#ifdef MONOLITH
static void s_server_init(void)
        {
        accept_socket=-1;
        s_server_verify=SSL_VERIFY_NONE;
        s_dcert_file=NULL;
        s_dkey_file=NULL;
        s_dchain_file=NULL;
        s_cert_file=TEST_CERT;
        s_key_file=NULL;
        s_chain_file=NULL;
#ifndef OPENSSL_NO_TLSEXT
        s_cert_file2=TEST_CERT2;
        s_key_file2=NULL;
        ctx2=NULL;
#endif
#ifdef FIONBIO
        s_nbio=0;
#endif
        s_nbio_test=0;
        ctx=NULL;
        www=0;

        bio_s_out=NULL;
        s_debug=0;
        s_msg=0;
        s_quiet=0;
        s_brief=0;
        hack=0;
#ifndef OPENSSL_NO_ENGINE
        engine_id=NULL;
#endif
        }
#endif

static void sv_usage(void)
        {
        BIO_printf(bio_err,"usage: s_server [args ...]\n");
        BIO_printf(bio_err,"\n");
        BIO_printf(bio_err," -accept port  - TCP/IP port to accept on (default is %d)\n",PORT);
        BIO_printf(bio_err," -unix path    - unix domain socket to accept on\n");
        BIO_printf(bio_err," -unlink       - for -unix, unlink existing socket first\n");
        BIO_printf(bio_err," -context arg  - set session ID context\n");
        BIO_printf(bio_err," -verify arg   - turn on peer certificate verification\n");
        BIO_printf(bio_err," -Verify arg   - turn on peer certificate verification, must have a cert.\n");
        BIO_printf(bio_err," -verify_return_error - return verification errors\n");
        BIO_printf(bio_err," -cert arg     - certificate file to use\n");
        BIO_printf(bio_err,"                 (default is %s)\n",TEST_CERT);
        BIO_printf(bio_err," -naccept arg  - terminate after 'arg' connections\n");
#ifndef OPENSSL_NO_TLSEXT
        BIO_printf(bio_err," -serverinfo arg - PEM serverinfo file for certificate\n");
#endif
    BIO_printf(bio_err," -no_resumption_on_reneg - set SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION flag\n");
        BIO_printf(bio_err," -crl_check    - check the peer certificate has not been revoked by its CA.\n" \
                           "                 The CRL(s) are appended to the certificate file\n");
        BIO_printf(bio_err," -crl_check_all - check the peer certificate has not been revoked by its CA\n" \
                           "                 or any other CRL in the CA chain. CRL(s) are appened to the\n" \
                           "                 the certificate file.\n");
        BIO_printf(bio_err," -certform arg - certificate format (PEM or DER) PEM default\n");
        BIO_printf(bio_err," -key arg      - Private Key file to use, in cert file if\n");
        BIO_printf(bio_err,"                 not specified (default is %s)\n",TEST_CERT);
        BIO_printf(bio_err," -keyform arg  - key format (PEM, DER or ENGINE) PEM default\n");
        BIO_printf(bio_err," -pass arg     - private key file pass phrase source\n");
        BIO_printf(bio_err," -dcert arg    - second certificate file to use (usually for DSA)\n");
        BIO_printf(bio_err," -dcertform x  - second certificate format (PEM or DER) PEM default\n");
        BIO_printf(bio_err," -dkey arg     - second private key file to use (usually for DSA)\n");
        BIO_printf(bio_err," -dkeyform arg - second key format (PEM, DER or ENGINE) PEM default\n");
        BIO_printf(bio_err," -dpass arg    - second private key file pass phrase source\n");
        BIO_printf(bio_err," -dhparam arg  - DH parameter file to use, in cert file if not specified\n");
        BIO_printf(bio_err,"                 or a default set of parameters is used\n");
#ifndef OPENSSL_NO_ECDH
        BIO_printf(bio_err," -named_curve arg  - Elliptic curve name to use for ephemeral ECDH keys.\n" \
                           "                 Use \"openssl ecparam -list_curves\" for all names\n" \
                           "                 (default is nistp256).\n");
#endif
#ifdef FIONBIO
        BIO_printf(bio_err," -nbio         - Run with non-blocking IO\n");
#endif
        BIO_printf(bio_err," -nbio_test    - test with the non-blocking test bio\n");
        BIO_printf(bio_err," -crlf         - convert LF from terminal into CRLF\n");
        BIO_printf(bio_err," -debug        - Print more output\n");
        BIO_printf(bio_err," -msg          - Show protocol messages\n");
        BIO_printf(bio_err," -state        - Print the SSL states\n");
        BIO_printf(bio_err," -CApath arg   - PEM format directory of CA's\n");
        BIO_printf(bio_err," -CAfile arg   - PEM format file of CA's\n");
        BIO_printf(bio_err," -trusted_first - Use locally trusted CA's first when building trust chain\n");
        BIO_printf(bio_err," -nocert       - Don't use any certificates (Anon-DH)\n");
        BIO_printf(bio_err," -cipher arg   - play with 'openssl ciphers' to see what goes here\n");
        BIO_printf(bio_err," -serverpref   - Use server's cipher preferences\n");
        BIO_printf(bio_err," -quiet        - No server output\n");
        BIO_printf(bio_err," -no_tmp_rsa   - Do not generate a tmp RSA key\n");
#ifndef OPENSSL_NO_PSK
        BIO_printf(bio_err," -psk_hint arg - PSK identity hint to use\n");
        BIO_printf(bio_err," -psk arg      - PSK in hex (without 0x)\n");
# ifndef OPENSSL_NO_JPAKE
        BIO_printf(bio_err," -jpake arg    - JPAKE secret to use\n");
# endif
#endif
#ifndef OPENSSL_NO_SRP
        BIO_printf(bio_err," -srpvfile file      - The verifier file for SRP\n");
        BIO_printf(bio_err," -srpuserseed string - A seed string for a default user salt.\n");
#endif
        BIO_printf(bio_err," -ssl2         - Just talk SSLv2\n");
#ifndef OPENSSL_NO_SSL3_METHOD
        BIO_printf(bio_err," -ssl3         - Just talk SSLv3\n");
#endif
        BIO_printf(bio_err," -tls1_2       - Just talk TLSv1.2\n");
        BIO_printf(bio_err," -tls1_1       - Just talk TLSv1.1\n");
        BIO_printf(bio_err," -tls1         - Just talk TLSv1\n");
        BIO_printf(bio_err," -dtls1        - Just talk DTLSv1\n");
        BIO_printf(bio_err," -dtls1_2      - Just talk DTLSv1.2\n");
        BIO_printf(bio_err," -timeout      - Enable timeouts\n");
        BIO_printf(bio_err," -mtu          - Set link layer MTU\n");
        BIO_printf(bio_err," -chain        - Read a certificate chain\n");
        BIO_printf(bio_err," -no_ssl2      - Just disable SSLv2\n");
        BIO_printf(bio_err," -no_ssl3      - Just disable SSLv3\n");
        BIO_printf(bio_err," -no_tls1      - Just disable TLSv1\n");
        BIO_printf(bio_err," -no_tls1_1    - Just disable TLSv1.1\n");
        BIO_printf(bio_err," -no_tls1_2    - Just disable TLSv1.2\n");
#ifndef OPENSSL_NO_DH
        BIO_printf(bio_err," -no_dhe       - Disable ephemeral DH\n");
#endif
#ifndef OPENSSL_NO_ECDH
        BIO_printf(bio_err," -no_ecdhe     - Disable ephemeral ECDH\n");
#endif
        BIO_printf(bio_err, "-no_resume_ephemeral - Disable caching and tickets if ephemeral (EC)DH is used\n");
        BIO_printf(bio_err," -bugs         - Turn on SSL bug compatibility\n");
        BIO_printf(bio_err," -hack         - workaround for early Netscape code\n");
        BIO_printf(bio_err," -www          - Respond to a 'GET /' with a status page\n");
        BIO_printf(bio_err," -WWW          - Respond to a 'GET /<path> HTTP/1.0' with file ./<path>\n");
        BIO_printf(bio_err," -HTTP         - Respond to a 'GET /<path> HTTP/1.0' with file ./<path>\n");
        BIO_printf(bio_err,"                 with the assumption it contains a complete HTTP response.\n");
#ifndef OPENSSL_NO_ENGINE
        BIO_printf(bio_err," -engine id    - Initialise and use the specified engine\n");
#endif
        BIO_printf(bio_err," -id_prefix arg - Generate SSL/TLS session IDs prefixed by 'arg'\n");
        BIO_printf(bio_err," -rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
#ifndef OPENSSL_NO_TLSEXT
        BIO_printf(bio_err," -servername host - servername for HostName TLS extension\n");
        BIO_printf(bio_err," -servername_fatal - on mismatch send fatal alert (default warning alert)\n");
        BIO_printf(bio_err," -cert2 arg    - certificate file to use for servername\n");
        BIO_printf(bio_err,"                 (default is %s)\n",TEST_CERT2);
        BIO_printf(bio_err," -key2 arg     - Private Key file to use for servername, in cert file if\n");
        BIO_printf(bio_err,"                 not specified (default is %s)\n",TEST_CERT2);
        BIO_printf(bio_err," -tlsextdebug  - hex dump of all TLS extensions received\n");
        BIO_printf(bio_err," -no_ticket    - disable use of RFC4507bis session tickets\n");
        BIO_printf(bio_err," -legacy_renegotiation - enable use of legacy renegotiation (dangerous)\n");
# ifndef OPENSSL_NO_NEXTPROTONEG
        BIO_printf(bio_err," -nextprotoneg arg - set the advertised protocols for the NPN extension (comma-separated list)\n");
# endif
        BIO_printf(bio_err," -use_srtp profiles - Offer SRTP key management with a colon-separated profile list\n");
        BIO_printf(bio_err," -alpn arg  - set the advertised protocols for the ALPN extension (comma-separated list)\n");
#endif
        BIO_printf(bio_err," -keymatexport label   - Export keying material using label\n");
        BIO_printf(bio_err," -keymatexportlen len  - Export len bytes of keying material (default 20)\n");
        BIO_printf(bio_err," -status           - respond to certificate status requests\n");
        BIO_printf(bio_err," -status_verbose   - enable status request verbose printout\n");
        BIO_printf(bio_err," -status_timeout n - status request responder timeout\n");
        BIO_printf(bio_err," -status_url URL   - status request fallback URL\n");
        }

static int local_argc=0;
static char **local_argv;

#ifdef CHARSET_EBCDIC
static int ebcdic_new(BIO *bi);
static int ebcdic_free(BIO *a);
static int ebcdic_read(BIO *b, char *out, int outl);
static int ebcdic_write(BIO *b, const char *in, int inl);
static long ebcdic_ctrl(BIO *b, int cmd, long num, void *ptr);
static int ebcdic_gets(BIO *bp, char *buf, int size);
static int ebcdic_puts(BIO *bp, const char *str);

#define BIO_TYPE_EBCDIC_FILTER  (18|0x0200)
static BIO_METHOD methods_ebcdic=
        {
        BIO_TYPE_EBCDIC_FILTER,
        "EBCDIC/ASCII filter",
        ebcdic_write,
        ebcdic_read,
        ebcdic_puts,
        ebcdic_gets,
        ebcdic_ctrl,
        ebcdic_new,
        ebcdic_free,
        };

typedef struct
{
        size_t  alloced;
        char    buff[1];
} EBCDIC_OUTBUFF;

BIO_METHOD *BIO_f_ebcdic_filter()
{
        return(&methods_ebcdic);
}

static int ebcdic_new(BIO *bi)
{
        EBCDIC_OUTBUFF *wbuf;

        wbuf = (EBCDIC_OUTBUFF *)OPENSSL_malloc(sizeof(EBCDIC_OUTBUFF) + 1024);
        wbuf->alloced = 1024;
        wbuf->buff[0] = '\0';

        bi->ptr=(char *)wbuf;
        bi->init=1;
        bi->flags=0;
        return(1);
}

static int ebcdic_free(BIO *a)
{
        if (a == NULL) return(0);
        if (a->ptr != NULL)
                OPENSSL_free(a->ptr);
        a->ptr=NULL;
        a->init=0;
        a->flags=0;
        return(1);
}
        
static int ebcdic_read(BIO *b, char *out, int outl)
{
        int ret=0;

        if (out == NULL || outl == 0) return(0);
        if (b->next_bio == NULL) return(0);

        ret=BIO_read(b->next_bio,out,outl);
        if (ret > 0)
                ascii2ebcdic(out,out,ret);
        return(ret);
}

static int ebcdic_write(BIO *b, const char *in, int inl)
{
        EBCDIC_OUTBUFF *wbuf;
        int ret=0;
        int num;
        unsigned char n;

        if ((in == NULL) || (inl <= 0)) return(0);
        if (b->next_bio == NULL) return(0);

        wbuf=(EBCDIC_OUTBUFF *)b->ptr;

        if (inl > (num = wbuf->alloced))
        {
                num = num + num;  /* double the size */
                if (num < inl)
                        num = inl;
                OPENSSL_free(wbuf);
                wbuf=(EBCDIC_OUTBUFF *)OPENSSL_malloc(sizeof(EBCDIC_OUTBUFF) + num);

                wbuf->alloced = num;
                wbuf->buff[0] = '\0';

                b->ptr=(char *)wbuf;
        }

        ebcdic2ascii(wbuf->buff, in, inl);

        ret=BIO_write(b->next_bio, wbuf->buff, inl);

        return(ret);
}

static long ebcdic_ctrl(BIO *b, int cmd, long num, void *ptr)
{
        long ret;

        if (b->next_bio == NULL) return(0);
        switch (cmd)
        {
        case BIO_CTRL_DUP:
                ret=0L;
                break;
        default:
                ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
                break;
        }
        return(ret);
}

static int ebcdic_gets(BIO *bp, char *buf, int size)
{
        int i, ret=0;
        if (bp->next_bio == NULL) return(0);
/*      return(BIO_gets(bp->next_bio,buf,size));*/
        for (i=0; i<size-1; ++i)
        {
                ret = ebcdic_read(bp,&buf[i],1);
                if (ret <= 0)
                        break;
                else if (buf[i] == '\n')
                {
                        ++i;
                        break;
                }
        }
        if (i < size)
                buf[i] = '\0';
        return (ret < 0 && i == 0) ? ret : i;
}

static int ebcdic_puts(BIO *bp, const char *str)
{
        if (bp->next_bio == NULL) return(0);
        return ebcdic_write(bp, str, strlen(str));
}
#endif

#ifndef OPENSSL_NO_TLSEXT

/* This is a context that we pass to callbacks */
typedef struct tlsextctx_st {
   char * servername;
   BIO * biodebug;
   int extension_error;
} tlsextctx;


static int MS_CALLBACK ssl_servername_cb(SSL *s, int *ad, void *arg)
        {
        tlsextctx * p = (tlsextctx *) arg;
        const char * servername = SSL_get_servername(s, TLSEXT_NAMETYPE_host_name);
        if (servername && p->biodebug) 
                BIO_printf(p->biodebug,"Hostname in TLS extension: \"%s\"\n",servername);
        
        if (!p->servername)
                return SSL_TLSEXT_ERR_NOACK;
        
        if (servername)
                {
                if (strcasecmp(servername,p->servername)) 
                        return p->extension_error;
                if (ctx2)
                        {
                        BIO_printf(p->biodebug,"Switching server context.\n");
                        SSL_set_SSL_CTX(s,ctx2);
                        }     
                }
        return SSL_TLSEXT_ERR_OK;
}

/* Structure passed to cert status callback */

typedef struct tlsextstatusctx_st {
   /* Default responder to use */
   char *host, *path, *port;
   int use_ssl;
   int timeout;
   BIO *err;
   int verbose;
} tlsextstatusctx;

static tlsextstatusctx tlscstatp = {NULL, NULL, NULL, 0, -1, NULL, 0};

/* Certificate Status callback. This is called when a client includes a
 * certificate status request extension.
 *
 * This is a simplified version. It examines certificates each time and
 * makes one OCSP responder query for each request.
 *
 * A full version would store details such as the OCSP certificate IDs and
 * minimise the number of OCSP responses by caching them until they were
 * considered "expired".
 */

static int cert_status_cb(SSL *s, void *arg)
        {
        tlsextstatusctx *srctx = arg;
        BIO *err = srctx->err;
        char *host, *port, *path;
        int use_ssl;
        unsigned char *rspder = NULL;
        int rspderlen;
        STACK_OF(OPENSSL_STRING) *aia = NULL;
        X509 *x = NULL;
        X509_STORE_CTX inctx;
        X509_OBJECT obj;
        OCSP_REQUEST *req = NULL;
        OCSP_RESPONSE *resp = NULL;
        OCSP_CERTID *id = NULL;
        STACK_OF(X509_EXTENSION) *exts;
        int ret = SSL_TLSEXT_ERR_NOACK;
        int i;
#if 0
STACK_OF(OCSP_RESPID) *ids;
SSL_get_tlsext_status_ids(s, &ids);
BIO_printf(err, "cert_status: received %d ids\n", sk_OCSP_RESPID_num(ids));
#endif
        if (srctx->verbose)
                BIO_puts(err, "cert_status: callback called\n");
        /* Build up OCSP query from server certificate */
        x = SSL_get_certificate(s);
        aia = X509_get1_ocsp(x);
        if (aia)
                {
                if (!OCSP_parse_url(sk_OPENSSL_STRING_value(aia, 0),
                        &host, &port, &path, &use_ssl))
                        {
                        BIO_puts(err, "cert_status: can't parse AIA URL\n");
                        goto err;
                        }
                if (srctx->verbose)
                        BIO_printf(err, "cert_status: AIA URL: %s\n",
                                        sk_OPENSSL_STRING_value(aia, 0));
                }
        else
                {
                if (!srctx->host)
                        {
                        BIO_puts(srctx->err, "cert_status: no AIA and no default responder URL\n");
                        goto done;
                        }
                host = srctx->host;
                path = srctx->path;
                port = srctx->port;
                use_ssl = srctx->use_ssl;
                }
                
        if (!X509_STORE_CTX_init(&inctx,
                                SSL_CTX_get_cert_store(SSL_get_SSL_CTX(s)),
                                NULL, NULL))
                goto err;
        if (X509_STORE_get_by_subject(&inctx,X509_LU_X509,
                                X509_get_issuer_name(x),&obj) <= 0)
                {
                BIO_puts(err, "cert_status: Can't retrieve issuer certificate.\n");
                X509_STORE_CTX_cleanup(&inctx);
                goto done;
                }
        req = OCSP_REQUEST_new();
        if (!req)
                goto err;
        id = OCSP_cert_to_id(NULL, x, obj.data.x509);
        X509_free(obj.data.x509);
        X509_STORE_CTX_cleanup(&inctx);
        if (!id)
                goto err;
        if (!OCSP_request_add0_id(req, id))
                goto err;
        id = NULL;
        /* Add any extensions to the request */
        SSL_get_tlsext_status_exts(s, &exts);
        for (i = 0; i < sk_X509_EXTENSION_num(exts); i++)
                {
                X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
                if (!OCSP_REQUEST_add_ext(req, ext, -1))
                        goto err;
                }
        resp = process_responder(err, req, host, path, port, use_ssl, NULL,
                                        srctx->timeout);
        if (!resp)
                {
                BIO_puts(err, "cert_status: error querying responder\n");
                goto done;
                }
        rspderlen = i2d_OCSP_RESPONSE(resp, &rspder);
        if (rspderlen <= 0)
                goto err;
        SSL_set_tlsext_status_ocsp_resp(s, rspder, rspderlen);
        if (srctx->verbose)
                {
                BIO_puts(err, "cert_status: ocsp response sent:\n");
                OCSP_RESPONSE_print(err, resp, 2);
                }
        ret = SSL_TLSEXT_ERR_OK;
        done:
        if (ret != SSL_TLSEXT_ERR_OK)
                ERR_print_errors(err);
        if (aia)
                {
                OPENSSL_free(host);
                OPENSSL_free(path);
                OPENSSL_free(port);
                X509_email_free(aia);
                }
        if (id)
                OCSP_CERTID_free(id);
        if (req)
                OCSP_REQUEST_free(req);
        if (resp)
                OCSP_RESPONSE_free(resp);
        return ret;
        err:
        ret = SSL_TLSEXT_ERR_ALERT_FATAL;
        goto done;
        }

# ifndef OPENSSL_NO_NEXTPROTONEG
/* This is the context that we pass to next_proto_cb */
typedef struct tlsextnextprotoctx_st {
        unsigned char *data;
        unsigned int len;
} tlsextnextprotoctx;

static int next_proto_cb(SSL *s, const unsigned char **data, unsigned int *len, void *arg)
        {
        tlsextnextprotoctx *next_proto = arg;

        *data = next_proto->data;
        *len = next_proto->len;

        return SSL_TLSEXT_ERR_OK;
        }
# endif  /* ndef OPENSSL_NO_NEXTPROTONEG */

/* This the context that we pass to alpn_cb */
typedef struct tlsextalpnctx_st {
        unsigned char *data;
        unsigned short len;
} tlsextalpnctx;

static int alpn_cb(SSL *s, const unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen, void *arg)
        {
        tlsextalpnctx *alpn_ctx = arg;

        if (!s_quiet)
                {
                /* We can assume that |in| is syntactically valid. */
                unsigned i;
                BIO_printf(bio_s_out, "ALPN protocols advertised by the client: ");
                for (i = 0; i < inlen; )
                        {
                        if (i)
                                BIO_write(bio_s_out, ", ", 2);
                        BIO_write(bio_s_out, &in[i + 1], in[i]);
                        i += in[i] + 1;
                        }
                BIO_write(bio_s_out, "\n", 1);
                }

        if (SSL_select_next_proto((unsigned char**) out, outlen, alpn_ctx->data, alpn_ctx->len, in, inlen) !=
            OPENSSL_NPN_NEGOTIATED)
                {
                return SSL_TLSEXT_ERR_NOACK;
                }

        if (!s_quiet)
                {
                BIO_printf(bio_s_out, "ALPN protocols selected: ");
                BIO_write(bio_s_out, *out, *outlen);
                BIO_write(bio_s_out, "\n", 1);
                }

        return SSL_TLSEXT_ERR_OK;
        }
#endif  /* ndef OPENSSL_NO_TLSEXT */

static int not_resumable_sess_cb(SSL *s, int is_forward_secure)
        {
        /* disable resumption for sessions with forward secure ciphers */
        return is_forward_secure;
        }

int MAIN(int, char **);

#ifndef OPENSSL_NO_JPAKE
static char *jpake_secret = NULL;
#define no_jpake !jpake_secret
#else
#define no_jpake 1
#endif
#ifndef OPENSSL_NO_SRP
        static srpsrvparm srp_callback_parm;
#endif
static char *srtp_profiles = NULL;

int MAIN(int argc, char *argv[])
        {
        X509_VERIFY_PARAM *vpm = NULL;
        int badarg = 0;
        short port=PORT;
        const char *unix_path=NULL;
#ifndef NO_SYS_UN_H
        int unlink_unix_path=0;
#endif
        int (*server_cb)(char *hostname, int s, int stype, unsigned char *context);
        char *CApath=NULL,*CAfile=NULL;
        char *chCApath=NULL,*chCAfile=NULL;
        char *vfyCApath=NULL,*vfyCAfile=NULL;
        unsigned char *context = NULL;
        char *dhfile = NULL;
        int badop=0;
        int ret=1;
        int build_chain = 0;
        int no_tmp_rsa=0,no_dhe=0,no_ecdhe=0,nocert=0;
        int state=0;
        const SSL_METHOD *meth=NULL;
        int socket_type=SOCK_STREAM;
        ENGINE *e=NULL;
        char *inrand=NULL;
        int s_cert_format = FORMAT_PEM, s_key_format = FORMAT_PEM;
        char *passarg = NULL, *pass = NULL;
        char *dpassarg = NULL, *dpass = NULL;
        int s_dcert_format = FORMAT_PEM, s_dkey_format = FORMAT_PEM;
        X509 *s_cert = NULL, *s_dcert = NULL;
        STACK_OF(X509) *s_chain = NULL, *s_dchain = NULL;
        EVP_PKEY *s_key = NULL, *s_dkey = NULL;
        int no_cache = 0, ext_cache = 0;
        int rev = 0, naccept = -1;
        int sdebug = 0;
#ifndef OPENSSL_NO_TLSEXT
        EVP_PKEY *s_key2 = NULL;
        X509 *s_cert2 = NULL;
        tlsextctx tlsextcbp = {NULL, NULL, SSL_TLSEXT_ERR_ALERT_WARNING};
# ifndef OPENSSL_NO_NEXTPROTONEG
        const char *next_proto_neg_in = NULL;
        tlsextnextprotoctx next_proto = { NULL, 0};
# endif
        const char *alpn_in = NULL;
        tlsextalpnctx alpn_ctx = { NULL, 0};
#endif
#ifndef OPENSSL_NO_PSK
        /* by default do not send a PSK identity hint */
        static char *psk_identity_hint=NULL;
#endif
#ifndef OPENSSL_NO_SRP
        char *srpuserseed = NULL;
        char *srp_verifier_file = NULL;
#endif
        SSL_EXCERT *exc = NULL;
        SSL_CONF_CTX *cctx = NULL;
        STACK_OF(OPENSSL_STRING) *ssl_args = NULL;

        char *crl_file = NULL;
        int crl_format = FORMAT_PEM;
        int crl_download = 0;
        STACK_OF(X509_CRL) *crls = NULL;

        meth=SSLv23_server_method();

        local_argc=argc;
        local_argv=argv;

        apps_startup();
#ifdef MONOLITH
        s_server_init();
#endif

        if (bio_err == NULL)
                bio_err=BIO_new_fp(stderr,BIO_NOCLOSE);

        if (!load_config(bio_err, NULL))
                goto end;

        cctx = SSL_CONF_CTX_new();
        if (!cctx)
                goto end;
        SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_SERVER);
        SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CMDLINE);

        verify_depth=0;
#ifdef FIONBIO
        s_nbio=0;
#endif
        s_nbio_test=0;

        argc--;
        argv++;

        while (argc >= 1)
                {
                if      ((strcmp(*argv,"-port") == 0) ||
                         (strcmp(*argv,"-accept") == 0))
                        {
                        if (--argc < 1) goto bad;
                        if (!extract_port(*(++argv),&port))
                                goto bad;
                        }
                else if (strcmp(*argv,"-unix") == 0)
                        {
#ifdef NO_SYS_UN_H
                        BIO_printf(bio_err, "unix domain sockets unsupported\n");
                        goto bad;
#else
                        if (--argc < 1) goto bad;
                        unix_path = *(++argv);
#endif
                        }
                else if (strcmp(*argv,"-unlink") == 0)
                        {
#ifdef NO_SYS_UN_H
                        BIO_printf(bio_err, "unix domain sockets unsupported\n");
                        goto bad;
#else
                        unlink_unix_path = 1;
#endif
                        }
                else if (strcmp(*argv,"-naccept") == 0)
                        {
                        if (--argc < 1) goto bad;
                        naccept = atol(*(++argv));
                        if (naccept <= 0)
                                {
                                BIO_printf(bio_err, "bad accept value %s\n",
                                                        *argv);
                                goto bad;
                                }
                        }
                else if (strcmp(*argv,"-verify") == 0)
                        {
                        s_server_verify=SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE;
                        if (--argc < 1) goto bad;
                        verify_depth=atoi(*(++argv));
                        if (!s_quiet)
                                BIO_printf(bio_err,"verify depth is %d\n",verify_depth);
                        }
                else if (strcmp(*argv,"-Verify") == 0)
                        {
                        s_server_verify=SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT|
                                SSL_VERIFY_CLIENT_ONCE;
                        if (--argc < 1) goto bad;
                        verify_depth=atoi(*(++argv));
                        if (!s_quiet)
                                BIO_printf(bio_err,"verify depth is %d, must return a certificate\n",verify_depth);
                        }
                else if (strcmp(*argv,"-context") == 0)
                        {
                        if (--argc < 1) goto bad;
                        context= (unsigned char *)*(++argv);
                        }
                else if (strcmp(*argv,"-cert") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_cert_file= *(++argv);
                        }
                else if (strcmp(*argv,"-CRL") == 0)
                        {
                        if (--argc < 1) goto bad;
                        crl_file= *(++argv);
                        }
                else if (strcmp(*argv,"-crl_download") == 0)
                        crl_download = 1;
#ifndef OPENSSL_NO_TLSEXT
                else if (strcmp(*argv,"-serverinfo") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_serverinfo_file = *(++argv);
                        }
#endif
                else if (strcmp(*argv,"-certform") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_cert_format = str2fmt(*(++argv));
                        }
                else if (strcmp(*argv,"-key") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_key_file= *(++argv);
                        }
                else if (strcmp(*argv,"-keyform") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_key_format = str2fmt(*(++argv));
                        }
                else if (strcmp(*argv,"-pass") == 0)
                        {
                        if (--argc < 1) goto bad;
                        passarg = *(++argv);
                        }
                else if (strcmp(*argv,"-cert_chain") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_chain_file= *(++argv);
                        }
                else if (strcmp(*argv,"-dhparam") == 0)
                        {
                        if (--argc < 1) goto bad;
                        dhfile = *(++argv);
                        }
                else if (strcmp(*argv,"-dcertform") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_dcert_format = str2fmt(*(++argv));
                        }
                else if (strcmp(*argv,"-dcert") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_dcert_file= *(++argv);
                        }
                else if (strcmp(*argv,"-dkeyform") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_dkey_format = str2fmt(*(++argv));
                        }
                else if (strcmp(*argv,"-dpass") == 0)
                        {
                        if (--argc < 1) goto bad;
                        dpassarg = *(++argv);
                        }
                else if (strcmp(*argv,"-dkey") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_dkey_file= *(++argv);
                        }
                else if (strcmp(*argv,"-dcert_chain") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_dchain_file= *(++argv);
                        }
                else if (strcmp(*argv,"-nocert") == 0)
                        {
                        nocert=1;
                        }
                else if (strcmp(*argv,"-CApath") == 0)
                        {
                        if (--argc < 1) goto bad;
                        CApath= *(++argv);
                        }
                else if (strcmp(*argv,"-chainCApath") == 0)
                        {
                        if (--argc < 1) goto bad;
                        chCApath= *(++argv);
                        }
                else if (strcmp(*argv,"-verifyCApath") == 0)
                        {
                        if (--argc < 1) goto bad;
                        vfyCApath= *(++argv);
                        }
                else if (strcmp(*argv,"-no_cache") == 0)
                        no_cache = 1;
                else if (strcmp(*argv,"-ext_cache") == 0)
                        ext_cache = 1;
                else if (strcmp(*argv,"-CRLform") == 0)
                        {
                        if (--argc < 1) goto bad;
                        crl_format = str2fmt(*(++argv));
                        }
                else if (args_verify(&argv, &argc, &badarg, bio_err, &vpm))
                        {
                        if (badarg)
                                goto bad;
                        continue;
                        }
                else if (args_excert(&argv, &argc, &badarg, bio_err, &exc))
                        {
                        if (badarg)
                                goto bad;
                        continue;
                        }
                else if (args_ssl(&argv, &argc, cctx, &badarg, bio_err, &ssl_args))
                        {
                        if (badarg)
                                goto bad;
                        continue;
                        }
                else if (strcmp(*argv,"-verify_return_error") == 0)
                        verify_return_error = 1;
                else if (strcmp(*argv,"-verify_quiet") == 0)
                        verify_quiet = 1;
                else if (strcmp(*argv,"-build_chain") == 0)
                        build_chain = 1;
                else if (strcmp(*argv,"-CAfile") == 0)
                        {
                        if (--argc < 1) goto bad;
                        CAfile= *(++argv);
                        }
                else if (strcmp(*argv,"-chainCAfile") == 0)
                        {
                        if (--argc < 1) goto bad;
                        chCAfile= *(++argv);
                        }
                else if (strcmp(*argv,"-verifyCAfile") == 0)
                        {
                        if (--argc < 1) goto bad;
                        vfyCAfile= *(++argv);
                        }
#ifdef FIONBIO  
                else if (strcmp(*argv,"-nbio") == 0)
                        { s_nbio=1; }
#endif
                else if (strcmp(*argv,"-nbio_test") == 0)
                        {
#ifdef FIONBIO  
                        s_nbio=1;
#endif
                        s_nbio_test=1;
                        }
                else if (strcmp(*argv,"-ign_eof") == 0)
                        s_ign_eof=1;
                else if (strcmp(*argv,"-no_ign_eof") == 0)
                        s_ign_eof=0;
                else if (strcmp(*argv,"-debug") == 0)
                        { s_debug=1; }
#ifndef OPENSSL_NO_TLSEXT
                else if (strcmp(*argv,"-tlsextdebug") == 0)
                        s_tlsextdebug=1;
                else if (strcmp(*argv,"-status") == 0)
                        s_tlsextstatus=1;
                else if (strcmp(*argv,"-status_verbose") == 0)
                        {
                        s_tlsextstatus=1;
                        tlscstatp.verbose = 1;
                        }
                else if (!strcmp(*argv, "-status_timeout"))
                        {
                        s_tlsextstatus=1;
                        if (--argc < 1) goto bad;
                        tlscstatp.timeout = atoi(*(++argv));
                        }
                else if (!strcmp(*argv, "-status_url"))
                        {
                        s_tlsextstatus=1;
                        if (--argc < 1) goto bad;
                        if (!OCSP_parse_url(*(++argv),
                                        &tlscstatp.host,
                                        &tlscstatp.port,
                                        &tlscstatp.path,
                                        &tlscstatp.use_ssl))
                                {
                                BIO_printf(bio_err, "Error parsing URL\n");
                                goto bad;
                                }
                        }
#endif
                else if (strcmp(*argv,"-msg") == 0)
                        { s_msg=1; }
                else if (strcmp(*argv,"-msgfile") == 0)
                        {
                        if (--argc < 1) goto bad;
                        bio_s_msg = BIO_new_file(*(++argv), "w");
                        }
#ifndef OPENSSL_NO_SSL_TRACE
                else if (strcmp(*argv,"-trace") == 0)
                        { s_msg=2; }
#endif
                else if (strcmp(*argv,"-security_debug") == 0)
                        { sdebug=1; }
                else if (strcmp(*argv,"-security_debug_verbose") == 0)
                        { sdebug=2; }
                else if (strcmp(*argv,"-hack") == 0)
                        { hack=1; }
                else if (strcmp(*argv,"-state") == 0)
                        { state=1; }
                else if (strcmp(*argv,"-crlf") == 0)
                        { s_crlf=1; }
                else if (strcmp(*argv,"-quiet") == 0)
                        { s_quiet=1; }
                else if (strcmp(*argv,"-brief") == 0)
                        {
                        s_quiet=1;
                        s_brief=1;
                        verify_quiet=1;
                        }
                else if (strcmp(*argv,"-no_tmp_rsa") == 0)
                        { no_tmp_rsa=1; }
                else if (strcmp(*argv,"-no_dhe") == 0)
                        { no_dhe=1; }
                else if (strcmp(*argv,"-no_ecdhe") == 0)
                        { no_ecdhe=1; }
                else if (strcmp(*argv,"-no_resume_ephemeral") == 0)
                        { no_resume_ephemeral = 1; }
#ifndef OPENSSL_NO_PSK
                else if (strcmp(*argv,"-psk_hint") == 0)
                        {
                        if (--argc < 1) goto bad;
                        psk_identity_hint= *(++argv);
                        }
                else if (strcmp(*argv,"-psk") == 0)
                        {
                        size_t i;

                        if (--argc < 1) goto bad;
                        psk_key=*(++argv);
                        for (i=0; i<strlen(psk_key); i++)
                                {
                                if (isxdigit((unsigned char)psk_key[i]))
                                        continue;
                                BIO_printf(bio_err,"Not a hex number '%s'\n",*argv);
                                goto bad;
                                }
                        }
#endif
#ifndef OPENSSL_NO_SRP
                else if (strcmp(*argv, "-srpvfile") == 0)
                        {
                        if (--argc < 1) goto bad;
                        srp_verifier_file = *(++argv);
                        meth = TLSv1_server_method();
                        }
                else if (strcmp(*argv, "-srpuserseed") == 0)
                        {
                        if (--argc < 1) goto bad;
                        srpuserseed = *(++argv);
                        meth = TLSv1_server_method();
                        }
#endif
                else if (strcmp(*argv,"-rev") == 0)
                        { rev=1; }
                else if (strcmp(*argv,"-www") == 0)
                        { www=1; }
                else if (strcmp(*argv,"-WWW") == 0)
                        { www=2; }
                else if (strcmp(*argv,"-HTTP") == 0)
                        { www=3; }
#ifndef OPENSSL_NO_SSL2
                else if (strcmp(*argv,"-ssl2") == 0)
                        {
                        no_ecdhe=1;
                        meth=SSLv2_server_method();
                        }
#endif
#ifndef OPENSSL_NO_SSL3_METHOD
                else if (strcmp(*argv,"-ssl3") == 0)
                        { meth=SSLv3_server_method(); }
#endif
#ifndef OPENSSL_NO_TLS1
                else if (strcmp(*argv,"-tls1") == 0)
                        { meth=TLSv1_server_method(); }
                else if (strcmp(*argv,"-tls1_1") == 0)
                        { meth=TLSv1_1_server_method(); }
                else if (strcmp(*argv,"-tls1_2") == 0)
                        { meth=TLSv1_2_server_method(); }
#endif
#ifndef OPENSSL_NO_DTLS1
                else if (strcmp(*argv,"-dtls") == 0)
                        { 
                        meth=DTLS_server_method();
                        socket_type = SOCK_DGRAM;
                        }
                else if (strcmp(*argv,"-dtls1") == 0)
                        { 
                        meth=DTLSv1_server_method();
                        socket_type = SOCK_DGRAM;
                        }
                else if (strcmp(*argv,"-dtls1_2") == 0)
                        { 
                        meth=DTLSv1_2_server_method();
                        socket_type = SOCK_DGRAM;
                        }
                else if (strcmp(*argv,"-timeout") == 0)
                        enable_timeouts = 1;
                else if (strcmp(*argv,"-mtu") == 0)
                        {
                        if (--argc < 1) goto bad;
                        socket_mtu = atol(*(++argv));
                        }
                else if (strcmp(*argv, "-chain") == 0)
                        cert_chain = 1;
#endif
                else if (strcmp(*argv, "-id_prefix") == 0)
                        {
                        if (--argc < 1) goto bad;
                        session_id_prefix = *(++argv);
                        }
#ifndef OPENSSL_NO_ENGINE
                else if (strcmp(*argv,"-engine") == 0)
                        {
                        if (--argc < 1) goto bad;
                        engine_id= *(++argv);
                        }
#endif
                else if (strcmp(*argv,"-rand") == 0)
                        {
                        if (--argc < 1) goto bad;
                        inrand= *(++argv);
                        }
#ifndef OPENSSL_NO_TLSEXT
                else if (strcmp(*argv,"-servername") == 0)
                        {
                        if (--argc < 1) goto bad;
                        tlsextcbp.servername= *(++argv);
                        }
                else if (strcmp(*argv,"-servername_fatal") == 0)
                        { tlsextcbp.extension_error = SSL_TLSEXT_ERR_ALERT_FATAL; }
                else if (strcmp(*argv,"-cert2") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_cert_file2= *(++argv);
                        }
                else if (strcmp(*argv,"-key2") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_key_file2= *(++argv);
                        }
# ifndef OPENSSL_NO_NEXTPROTONEG
                else if (strcmp(*argv,"-nextprotoneg") == 0)
                        {
                        if (--argc < 1) goto bad;
                        next_proto_neg_in = *(++argv);
                        }
# endif
                else if (strcmp(*argv,"-alpn") == 0)
                        {
                        if (--argc < 1) goto bad;
                        alpn_in = *(++argv);
                        }
#endif
#if !defined(OPENSSL_NO_JPAKE) && !defined(OPENSSL_NO_PSK)
                else if (strcmp(*argv,"-jpake") == 0)
                        {
                        if (--argc < 1) goto bad;
                        jpake_secret = *(++argv);
                        }
#endif
                else if (strcmp(*argv,"-use_srtp") == 0)
                        {
                        if (--argc < 1) goto bad;
                        srtp_profiles = *(++argv);
                        }
                else if (strcmp(*argv,"-keymatexport") == 0)
                        {
                        if (--argc < 1) goto bad;
                        keymatexportlabel= *(++argv);
                        }
                else if (strcmp(*argv,"-keymatexportlen") == 0)
                        {
                        if (--argc < 1) goto bad;
                        keymatexportlen=atoi(*(++argv));
                        if (keymatexportlen == 0) goto bad;
                        }
                else
                        {
                        BIO_printf(bio_err,"unknown option %s\n",*argv);
                        badop=1;
                        break;
                        }
                argc--;
                argv++;
                }
        if (badop)
                {
bad:
                sv_usage();
                goto end;
                }
#ifndef OPENSSL_NO_DTLS1
        if (www && socket_type == SOCK_DGRAM)
                {
                BIO_printf(bio_err,
                                "Can't use -HTTP, -www or -WWW with DTLS\n");
                goto end;
                }
#endif

        if (unix_path && (socket_type != SOCK_STREAM))
                {
                BIO_printf(bio_err, "Can't use unix sockets and datagrams together\n");
                        goto end;
                }
#if !defined(OPENSSL_NO_JPAKE) && !defined(OPENSSL_NO_PSK)
        if (jpake_secret)
                {
                if (psk_key)
                        {
                        BIO_printf(bio_err,
                                   "Can't use JPAKE and PSK together\n");
                        goto end;
                        }
                psk_identity = "JPAKE";
                }
#endif

        SSL_load_error_strings();
        OpenSSL_add_ssl_algorithms();

#ifndef OPENSSL_NO_ENGINE
        e = setup_engine(bio_err, engine_id, 1);
#endif

        if (!app_passwd(bio_err, passarg, dpassarg, &pass, &dpass))
                {
                BIO_printf(bio_err, "Error getting password\n");
                goto end;
                }


        if (s_key_file == NULL)
                s_key_file = s_cert_file;
#ifndef OPENSSL_NO_TLSEXT
        if (s_key_file2 == NULL)
                s_key_file2 = s_cert_file2;
#endif

        if (!load_excert(&exc, bio_err))
                goto end;

        if (nocert == 0)
                {
                s_key = load_key(bio_err, s_key_file, s_key_format, 0, pass, e,
                       "server certificate private key file");
                if (!s_key)
                        {
                        ERR_print_errors(bio_err);
                        goto end;
                        }

                s_cert = load_cert(bio_err,s_cert_file,s_cert_format,
                        NULL, e, "server certificate file");

                if (!s_cert)
                        {
                        ERR_print_errors(bio_err);
                        goto end;
                        }
                if (s_chain_file)
                        {
                        s_chain = load_certs(bio_err, s_chain_file,FORMAT_PEM,
                                        NULL, e, "server certificate chain");
                        if (!s_chain)
                                goto end;
                        }

#ifndef OPENSSL_NO_TLSEXT
                if (tlsextcbp.servername) 
                        {
                        s_key2 = load_key(bio_err, s_key_file2, s_key_format, 0, pass, e,
                                "second server certificate private key file");
                        if (!s_key2)
                                {
                                ERR_print_errors(bio_err);
                                goto end;
                                }
                        
                        s_cert2 = load_cert(bio_err,s_cert_file2,s_cert_format,
                                NULL, e, "second server certificate file");
                        
                        if (!s_cert2)
                                {
                                ERR_print_errors(bio_err);
                                goto end;
                                }
                        }
#endif /* OPENSSL_NO_TLSEXT */
                }

#if !defined(OPENSSL_NO_TLSEXT)
# if !defined(OPENSSL_NO_NEXTPROTONEG) 
        if (next_proto_neg_in)
                {
                unsigned short len;
                next_proto.data = next_protos_parse(&len, next_proto_neg_in);
                if (next_proto.data == NULL)
                        goto end;
                next_proto.len = len;
                }
        else
                {
                next_proto.data = NULL;
                }
# endif
        alpn_ctx.data = NULL;
        if (alpn_in)
                {
                unsigned short len;
                alpn_ctx.data = next_protos_parse(&len, alpn_in);
                if (alpn_ctx.data == NULL)
                        goto end;
                alpn_ctx.len = len;
                }
#endif

        if (crl_file)
                {
                X509_CRL *crl;
                crl = load_crl(crl_file, crl_format);
                if (!crl)
                        {
                        BIO_puts(bio_err, "Error loading CRL\n");
                        ERR_print_errors(bio_err);
                        goto end;
                        }
                crls = sk_X509_CRL_new_null();
                if (!crls || !sk_X509_CRL_push(crls, crl))
                        {
                        BIO_puts(bio_err, "Error adding CRL\n");
                        ERR_print_errors(bio_err);
                        X509_CRL_free(crl);
                        goto end;
                        }
                }


        if (s_dcert_file)
                {

                if (s_dkey_file == NULL)
                        s_dkey_file = s_dcert_file;

                s_dkey = load_key(bio_err, s_dkey_file, s_dkey_format,
                                0, dpass, e,
                               "second certificate private key file");
                if (!s_dkey)
                        {
                        ERR_print_errors(bio_err);
                        goto end;
                        }

                s_dcert = load_cert(bio_err,s_dcert_file,s_dcert_format,
                                NULL, e, "second server certificate file");

                if (!s_dcert)
                        {
                        ERR_print_errors(bio_err);
                        goto end;
                        }
                if (s_dchain_file)
                        {
                        s_dchain = load_certs(bio_err, s_dchain_file,FORMAT_PEM,
                                NULL, e, "second server certificate chain");
                        if (!s_dchain)
                                goto end;
                        }

                }

        if (!app_RAND_load_file(NULL, bio_err, 1) && inrand == NULL
                && !RAND_status())
                {
                BIO_printf(bio_err,"warning, not much extra random data, consider using the -rand option\n");
                }
        if (inrand != NULL)
                BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
                        app_RAND_load_files(inrand));

        if (bio_s_out == NULL)
                {
                if (s_quiet && !s_debug)
                        {
                        bio_s_out=BIO_new(BIO_s_null());
                        if (s_msg && !bio_s_msg)
                                bio_s_msg=BIO_new_fp(stdout,BIO_NOCLOSE);
                        }
                else
                        {
                        if (bio_s_out == NULL)
                                bio_s_out=BIO_new_fp(stdout,BIO_NOCLOSE);
                        }
                }

#if !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
        if (nocert)
#endif
                {
                s_cert_file=NULL;
                s_key_file=NULL;
                s_dcert_file=NULL;
                s_dkey_file=NULL;
#ifndef OPENSSL_NO_TLSEXT
                s_cert_file2=NULL;
                s_key_file2=NULL;
#endif
                }

        ctx=SSL_CTX_new(meth);
        if (sdebug)
                ssl_ctx_security_debug(ctx, bio_err, sdebug);
        if (ctx == NULL)
                {
                ERR_print_errors(bio_err);
                goto end;
                }
        if (session_id_prefix)
                {
                if(strlen(session_id_prefix) >= 32)
                        BIO_printf(bio_err,
"warning: id_prefix is too long, only one new session will be possible\n");
                else if(strlen(session_id_prefix) >= 16)
                        BIO_printf(bio_err,
"warning: id_prefix is too long if you use SSLv2\n");
                if(!SSL_CTX_set_generate_session_id(ctx, generate_session_id))
                        {
                        BIO_printf(bio_err,"error setting 'id_prefix'\n");
                        ERR_print_errors(bio_err);
                        goto end;
                        }
                BIO_printf(bio_err,"id_prefix '%s' set.\n", session_id_prefix);
                }
        SSL_CTX_set_quiet_shutdown(ctx,1);
        if (hack) SSL_CTX_set_options(ctx,SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG);
        if (exc) ssl_ctx_set_excert(ctx, exc);
        /* DTLS: partial reads end up discarding unread UDP bytes :-( 
         * Setting read ahead solves this problem.
         */
        if (socket_type == SOCK_DGRAM) SSL_CTX_set_read_ahead(ctx, 1);

        if (state) SSL_CTX_set_info_callback(ctx,apps_ssl_info_callback);
        if (no_cache)
                SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
        else if (ext_cache)
                init_session_cache_ctx(ctx);
        else
                SSL_CTX_sess_set_cache_size(ctx,128);

        if (srtp_profiles != NULL)
                SSL_CTX_set_tlsext_use_srtp(ctx, srtp_profiles);

#if 0
        if (cipher == NULL) cipher=getenv("SSL_CIPHER");
#endif

#if 0
        if (s_cert_file == NULL)
                {
                BIO_printf(bio_err,"You must specify a certificate file for the server to use\n");
                goto end;
                }
#endif

        if ((!SSL_CTX_load_verify_locations(ctx,CAfile,CApath)) ||
                (!SSL_CTX_set_default_verify_paths(ctx)))
                {
                /* BIO_printf(bio_err,"X509_load_verify_locations\n"); */
                ERR_print_errors(bio_err);
                /* goto end; */
                }
        if (vpm)
                SSL_CTX_set1_param(ctx, vpm);

        ssl_ctx_add_crls(ctx, crls, 0);
        if (!args_ssl_call(ctx, bio_err, cctx, ssl_args, no_ecdhe, no_jpake))
                goto end;

        if (!ssl_load_stores(ctx, vfyCApath, vfyCAfile, chCApath, chCAfile,
                                                crls, crl_download))
                {
                BIO_printf(bio_err, "Error loading store locations\n");
                ERR_print_errors(bio_err);
                goto end;
                }

#ifndef OPENSSL_NO_TLSEXT
        if (s_cert2)
                {
                ctx2=SSL_CTX_new(meth);
                if (ctx2 == NULL)
                        {
                        ERR_print_errors(bio_err);
                        goto end;
                        }
                }
        
        if (ctx2)
                {
                BIO_printf(bio_s_out,"Setting secondary ctx parameters\n");

                if (sdebug)
                        ssl_ctx_security_debug(ctx, bio_err, sdebug);

                if (session_id_prefix)
                        {
                        if(strlen(session_id_prefix) >= 32)
                                BIO_printf(bio_err,
                                        "warning: id_prefix is too long, only one new session will be possible\n");
                        else if(strlen(session_id_prefix) >= 16)
                                BIO_printf(bio_err,
                                        "warning: id_prefix is too long if you use SSLv2\n");
                        if(!SSL_CTX_set_generate_session_id(ctx2, generate_session_id))
                                {
                                BIO_printf(bio_err,"error setting 'id_prefix'\n");
                                ERR_print_errors(bio_err);
                                goto end;
                                }
                        BIO_printf(bio_err,"id_prefix '%s' set.\n", session_id_prefix);
                        }
                SSL_CTX_set_quiet_shutdown(ctx2,1);
                if (hack) SSL_CTX_set_options(ctx2,SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG);
                if (exc) ssl_ctx_set_excert(ctx2, exc);
                /* DTLS: partial reads end up discarding unread UDP bytes :-( 
                 * Setting read ahead solves this problem.
                 */
                if (socket_type == SOCK_DGRAM) SSL_CTX_set_read_ahead(ctx2, 1);

                if (state) SSL_CTX_set_info_callback(ctx2,apps_ssl_info_callback);

                if (no_cache)
                        SSL_CTX_set_session_cache_mode(ctx2,SSL_SESS_CACHE_OFF);
                else if (ext_cache)
                        init_session_cache_ctx(ctx2);
                else
                        SSL_CTX_sess_set_cache_size(ctx2,128);

                if ((!SSL_CTX_load_verify_locations(ctx2,CAfile,CApath)) ||
                        (!SSL_CTX_set_default_verify_paths(ctx2)))
                        {
                        ERR_print_errors(bio_err);
                        }
                if (vpm)
                        SSL_CTX_set1_param(ctx2, vpm);

                ssl_ctx_add_crls(ctx2, crls, 0);
                if (!args_ssl_call(ctx2, bio_err, cctx, ssl_args, no_ecdhe, no_jpake))
                        goto end;
                }

# ifndef OPENSSL_NO_NEXTPROTONEG
        if (next_proto.data)
                SSL_CTX_set_next_protos_advertised_cb(ctx, next_proto_cb, &next_proto);
# endif
        if (alpn_ctx.data)
                SSL_CTX_set_alpn_select_cb(ctx, alpn_cb, &alpn_ctx);
#endif 

#ifndef OPENSSL_NO_DH
        if (!no_dhe)
                {
                DH *dh=NULL;

                if (dhfile)
                        dh = load_dh_param(dhfile);
                else if (s_cert_file)
                        dh = load_dh_param(s_cert_file);

                if (dh != NULL)
                        {
                        BIO_printf(bio_s_out,"Setting temp DH parameters\n");
                        }
                else
                        {
                        BIO_printf(bio_s_out,"Using default temp DH parameters\n");
                        }
                (void)BIO_flush(bio_s_out);

                if (dh == NULL)
                        SSL_CTX_set_dh_auto(ctx, 1);
                else if (!SSL_CTX_set_tmp_dh(ctx,dh))
                        {
                        BIO_puts(bio_err, "Error setting temp DH parameters\n");
                        ERR_print_errors(bio_err);
                        DH_free(dh);
                        goto end;
                        }
#ifndef OPENSSL_NO_TLSEXT
                if (ctx2)
                        {
                        if (!dhfile)
                                { 
                                DH *dh2=load_dh_param(s_cert_file2);
                                if (dh2 != NULL)
                                        {
                                        BIO_printf(bio_s_out,"Setting temp DH parameters\n");
                                        (void)BIO_flush(bio_s_out);

                                        DH_free(dh);
                                        dh = dh2;
                                        }
                                }
                        if (dh == NULL)
                                SSL_CTX_set_dh_auto(ctx2, 1);
                        else if (!SSL_CTX_set_tmp_dh(ctx2,dh))
                                {
                                BIO_puts(bio_err, "Error setting temp DH parameters\n");
                                ERR_print_errors(bio_err);
                                DH_free(dh);
                                goto end;
                                }
                        }
#endif
                DH_free(dh);
                }
#endif

        if (!set_cert_key_stuff(ctx, s_cert, s_key, s_chain, build_chain))
                goto end;
#ifndef OPENSSL_NO_TLSEXT
        if (s_serverinfo_file != NULL
            && !SSL_CTX_use_serverinfo_file(ctx, s_serverinfo_file))
                {
                ERR_print_errors(bio_err);
                goto end;
                }
#endif
#ifndef OPENSSL_NO_TLSEXT
        if (ctx2 && !set_cert_key_stuff(ctx2,s_cert2,s_key2, NULL, build_chain))
                goto end; 
#endif
        if (s_dcert != NULL)
                {
                if (!set_cert_key_stuff(ctx, s_dcert, s_dkey, s_dchain, build_chain))
                        goto end;
                }

#ifndef OPENSSL_NO_RSA
#if 1
        if (!no_tmp_rsa)
                {
                SSL_CTX_set_tmp_rsa_callback(ctx,tmp_rsa_cb);
#ifndef OPENSSL_NO_TLSEXT
                if (ctx2) 
                        SSL_CTX_set_tmp_rsa_callback(ctx2,tmp_rsa_cb);
#endif          
                }
#else
        if (!no_tmp_rsa && SSL_CTX_need_tmp_RSA(ctx))
                {
                RSA *rsa;

                BIO_printf(bio_s_out,"Generating temp (512 bit) RSA key...");
                BIO_flush(bio_s_out);

                rsa=RSA_generate_key(512,RSA_F4,NULL);

                if (!SSL_CTX_set_tmp_rsa(ctx,rsa))
                        {
                        ERR_print_errors(bio_err);
                        goto end;
                        }
#ifndef OPENSSL_NO_TLSEXT
                        if (ctx2)
                                {
                                if (!SSL_CTX_set_tmp_rsa(ctx2,rsa))
                                        {
                                        ERR_print_errors(bio_err);
                                        goto end;
                                        }
                                }
#endif
                RSA_free(rsa);
                BIO_printf(bio_s_out,"\n");
                }
#endif
#endif

        if (no_resume_ephemeral)
                {
                SSL_CTX_set_not_resumable_session_callback(ctx, not_resumable_sess_cb);
#ifndef OPENSSL_NO_TLSEXT
                if (ctx2)
                        SSL_CTX_set_not_resumable_session_callback(ctx2, not_resumable_sess_cb);
#endif
                }

#ifndef OPENSSL_NO_PSK
#ifdef OPENSSL_NO_JPAKE
        if (psk_key != NULL)
#else
        if (psk_key != NULL || jpake_secret)
#endif
                {
                if (s_debug)
                        BIO_printf(bio_s_out, "PSK key given or JPAKE in use, setting server callback\n");
                SSL_CTX_set_psk_server_callback(ctx, psk_server_cb);
                }

        if (!SSL_CTX_use_psk_identity_hint(ctx, psk_identity_hint))
                {
                BIO_printf(bio_err,"error setting PSK identity hint to context\n");
                ERR_print_errors(bio_err);
                goto end;
                }
#endif

        SSL_CTX_set_verify(ctx,s_server_verify,verify_callback);
        SSL_CTX_set_session_id_context(ctx,(void*)&s_server_session_id_context,
                sizeof s_server_session_id_context);

        /* Set DTLS cookie generation and verification callbacks */
        SSL_CTX_set_cookie_generate_cb(ctx, generate_cookie_callback);
        SSL_CTX_set_cookie_verify_cb(ctx, verify_cookie_callback);

#ifndef OPENSSL_NO_TLSEXT
        if (ctx2)
                {
                SSL_CTX_set_verify(ctx2,s_server_verify,verify_callback);
                SSL_CTX_set_session_id_context(ctx2,(void*)&s_server_session_id_context,
                        sizeof s_server_session_id_context);

                tlsextcbp.biodebug = bio_s_out;
                SSL_CTX_set_tlsext_servername_callback(ctx2, ssl_servername_cb);
                SSL_CTX_set_tlsext_servername_arg(ctx2, &tlsextcbp);
                SSL_CTX_set_tlsext_servername_callback(ctx, ssl_servername_cb);
                SSL_CTX_set_tlsext_servername_arg(ctx, &tlsextcbp);
                }
#endif

#ifndef OPENSSL_NO_SRP
        if (srp_verifier_file != NULL)
                {
                srp_callback_parm.vb = SRP_VBASE_new(srpuserseed);
                srp_callback_parm.user = NULL;
                srp_callback_parm.login = NULL;
                if ((ret = SRP_VBASE_init(srp_callback_parm.vb, srp_verifier_file)) != SRP_NO_ERROR)
                        {
                        BIO_printf(bio_err,
                                   "Cannot initialize SRP verifier file \"%s\":ret=%d\n",
                                   srp_verifier_file, ret);
                                goto end;
                        }
                SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE,verify_callback);
                SSL_CTX_set_srp_cb_arg(ctx, &srp_callback_parm);                        
                SSL_CTX_set_srp_username_callback(ctx, ssl_srp_server_param_cb);
                }
        else
#endif
        if (CAfile != NULL)
                {
                SSL_CTX_set_client_CA_list(ctx,SSL_load_client_CA_file(CAfile));
#ifndef OPENSSL_NO_TLSEXT
                if (ctx2) 
                        SSL_CTX_set_client_CA_list(ctx2,SSL_load_client_CA_file(CAfile));
#endif
                }

        BIO_printf(bio_s_out,"ACCEPT\n");
        (void)BIO_flush(bio_s_out);
        if (rev)
                server_cb = rev_body;
        else if (www)
                server_cb = www_body;
        else
                server_cb = sv_body;
#ifndef NO_SYS_UN_H
        if (unix_path)
                {
                if (unlink_unix_path)
                        unlink(unix_path);
                do_server_unix(unix_path,&accept_socket,server_cb, context, naccept);
                }
        else
#endif
                do_server(port,socket_type,&accept_socket,server_cb, context, naccept);
        print_stats(bio_s_out,ctx);
        ret=0;
end:
        if (ctx != NULL) SSL_CTX_free(ctx);
        if (s_cert)
                X509_free(s_cert);
        if (crls)
                sk_X509_CRL_pop_free(crls, X509_CRL_free);
        if (s_dcert)
                X509_free(s_dcert);
        if (s_key)
                EVP_PKEY_free(s_key);
        if (s_dkey)
                EVP_PKEY_free(s_dkey);
        if (s_chain)
                sk_X509_pop_free(s_chain, X509_free);
        if (s_dchain)
                sk_X509_pop_free(s_dchain, X509_free);
        if (pass)
                OPENSSL_free(pass);
        if (dpass)
                OPENSSL_free(dpass);
        if (vpm)
                X509_VERIFY_PARAM_free(vpm);
        free_sessions();
#ifndef OPENSSL_NO_TLSEXT
        if (tlscstatp.host)
                OPENSSL_free(tlscstatp.host);
        if (tlscstatp.port)
                OPENSSL_free(tlscstatp.port);
        if (tlscstatp.path)
                OPENSSL_free(tlscstatp.path);
        if (ctx2 != NULL) SSL_CTX_free(ctx2);
        if (s_cert2)
                X509_free(s_cert2);
        if (s_key2)
                EVP_PKEY_free(s_key2);
        if (serverinfo_in != NULL)
                BIO_free(serverinfo_in);
# ifndef OPENSSL_NO_NEXTPROTONEG
        if (next_proto.data)
                OPENSSL_free(next_proto.data);
# endif
        if (alpn_ctx.data)
                OPENSSL_free(alpn_ctx.data);
#endif
        ssl_excert_free(exc);
        if (ssl_args)
                sk_OPENSSL_STRING_free(ssl_args);
        if (cctx)
                SSL_CONF_CTX_free(cctx);
#ifndef OPENSSL_NO_JPAKE
        if (jpake_secret && psk_key)
                OPENSSL_free(psk_key);
#endif
        if (bio_s_out != NULL)
                {
                BIO_free(bio_s_out);
                bio_s_out=NULL;
                }
        if (bio_s_msg != NULL)
                {
                BIO_free(bio_s_msg);
                bio_s_msg = NULL;
                }
        apps_shutdown();
        OPENSSL_EXIT(ret);
        }

static void print_stats(BIO *bio, SSL_CTX *ssl_ctx)
        {
        BIO_printf(bio,"%4ld items in the session cache\n",
                SSL_CTX_sess_number(ssl_ctx));
        BIO_printf(bio,"%4ld client connects (SSL_connect())\n",
                SSL_CTX_sess_connect(ssl_ctx));
        BIO_printf(bio,"%4ld client renegotiates (SSL_connect())\n",
                SSL_CTX_sess_connect_renegotiate(ssl_ctx));
        BIO_printf(bio,"%4ld client connects that finished\n",
                SSL_CTX_sess_connect_good(ssl_ctx));
        BIO_printf(bio,"%4ld server accepts (SSL_accept())\n",
                SSL_CTX_sess_accept(ssl_ctx));
        BIO_printf(bio,"%4ld server renegotiates (SSL_accept())\n",
                SSL_CTX_sess_accept_renegotiate(ssl_ctx));
        BIO_printf(bio,"%4ld server accepts that finished\n",
                SSL_CTX_sess_accept_good(ssl_ctx));
        BIO_printf(bio,"%4ld session cache hits\n",SSL_CTX_sess_hits(ssl_ctx));
        BIO_printf(bio,"%4ld session cache misses\n",SSL_CTX_sess_misses(ssl_ctx));
        BIO_printf(bio,"%4ld session cache timeouts\n",SSL_CTX_sess_timeouts(ssl_ctx));
        BIO_printf(bio,"%4ld callback cache hits\n",SSL_CTX_sess_cb_hits(ssl_ctx));
        BIO_printf(bio,"%4ld cache full overflows (%ld allowed)\n",
                SSL_CTX_sess_cache_full(ssl_ctx),
                SSL_CTX_sess_get_cache_size(ssl_ctx));
        }

static int sv_body(char *hostname, int s, int stype, unsigned char *context)
        {
        char *buf=NULL;
        fd_set readfds;
        int ret=1,width;
        int k,i;
        unsigned long l;
        SSL *con=NULL;
        BIO *sbio;
#ifndef OPENSSL_NO_KRB5
        KSSL_CTX *kctx;
#endif
        struct timeval timeout;
#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_NETWARE) || defined(OPENSSL_SYS_BEOS_R5)
        struct timeval tv;
#else
        struct timeval *timeoutp;
#endif

        if ((buf=OPENSSL_malloc(bufsize)) == NULL)
                {
                BIO_printf(bio_err,"out of memory\n");
                goto err;
                }
#ifdef FIONBIO  
        if (s_nbio)
                {
                unsigned long sl=1;

                if (!s_quiet)
                        BIO_printf(bio_err,"turning on non blocking io\n");
                if (BIO_socket_ioctl(s,FIONBIO,&sl) < 0)
                        ERR_print_errors(bio_err);
                }
#endif

        if (con == NULL) {
                con=SSL_new(ctx);
#ifndef OPENSSL_NO_TLSEXT
        if (s_tlsextdebug)
                {
                SSL_set_tlsext_debug_callback(con, tlsext_cb);
                SSL_set_tlsext_debug_arg(con, bio_s_out);
                }
        if (s_tlsextstatus)
                {
                SSL_CTX_set_tlsext_status_cb(ctx, cert_status_cb);
                tlscstatp.err = bio_err;
                SSL_CTX_set_tlsext_status_arg(ctx, &tlscstatp);
                }
#endif
#ifndef OPENSSL_NO_KRB5
                if ((kctx = kssl_ctx_new()) != NULL)
                        {
                        SSL_set0_kssl_ctx(con, kctx);
                        kssl_ctx_setstring(kctx, KSSL_SERVICE, KRB5SVC);
                        kssl_ctx_setstring(kctx, KSSL_KEYTAB, KRB5KEYTAB);
                        }
#endif  /* OPENSSL_NO_KRB5 */
                if(context)
                      SSL_set_session_id_context(con, context,
                                                 strlen((char *)context));
        }
        SSL_clear(con);
#if 0
#ifdef TLSEXT_TYPE_opaque_prf_input
        SSL_set_tlsext_opaque_prf_input(con, "Test server", 11);
#endif
#endif

        if (stype == SOCK_DGRAM)
                {

                sbio=BIO_new_dgram(s,BIO_NOCLOSE);

                if (enable_timeouts)
                        {
                        timeout.tv_sec = 0;
                        timeout.tv_usec = DGRAM_RCV_TIMEOUT;
                        BIO_ctrl(sbio, BIO_CTRL_DGRAM_SET_RECV_TIMEOUT, 0, &timeout);
                        
                        timeout.tv_sec = 0;
                        timeout.tv_usec = DGRAM_SND_TIMEOUT;
                        BIO_ctrl(sbio, BIO_CTRL_DGRAM_SET_SEND_TIMEOUT, 0, &timeout);
                        }

                if (socket_mtu)
                        {
                        if(socket_mtu < DTLS_get_link_min_mtu(con))
                                {
                                BIO_printf(bio_err,"MTU too small. Must be at least %ld\n",
                                        DTLS_get_link_min_mtu(con));
                                ret = -1;
                                BIO_free(sbio);
                                goto err;
                                }
                        SSL_set_options(con, SSL_OP_NO_QUERY_MTU);
                        if(!DTLS_set_link_mtu(con, socket_mtu))
                                {
                                BIO_printf(bio_err, "Failed to set MTU\n");
                                ret = -1;
                                BIO_free(sbio);
                                goto err;
                                }
                        }
                else
                        /* want to do MTU discovery */
                        BIO_ctrl(sbio, BIO_CTRL_DGRAM_MTU_DISCOVER, 0, NULL);

        /* turn on cookie exchange */
        SSL_set_options(con, SSL_OP_COOKIE_EXCHANGE);
                }
        else
                sbio=BIO_new_socket(s,BIO_NOCLOSE);

        if (s_nbio_test)
                {
                BIO *test;

                test=BIO_new(BIO_f_nbio_test());
                sbio=BIO_push(test,sbio);
                }
#ifndef OPENSSL_NO_JPAKE
        if(jpake_secret)
                jpake_server_auth(bio_s_out, sbio, jpake_secret);
#endif

        SSL_set_bio(con,sbio,sbio);
        SSL_set_accept_state(con);
        /* SSL_set_fd(con,s); */

        if (s_debug)
                {
                SSL_set_debug(con, 1);
                BIO_set_callback(SSL_get_rbio(con),bio_dump_callback);
                BIO_set_callback_arg(SSL_get_rbio(con),(char *)bio_s_out);
                }
        if (s_msg)
                {
#ifndef OPENSSL_NO_SSL_TRACE
                if (s_msg == 2)
                        SSL_set_msg_callback(con, SSL_trace);
                else
#endif
                        SSL_set_msg_callback(con, msg_cb);
                SSL_set_msg_callback_arg(con, bio_s_msg ? bio_s_msg : bio_s_out);
                }
#ifndef OPENSSL_NO_TLSEXT
        if (s_tlsextdebug)
                {
                SSL_set_tlsext_debug_callback(con, tlsext_cb);
                SSL_set_tlsext_debug_arg(con, bio_s_out);
                }
#endif

        width=s+1;
        for (;;)
                {
                int read_from_terminal;
                int read_from_sslcon;

                read_from_terminal = 0;
                read_from_sslcon = SSL_pending(con);

                if (!read_from_sslcon)
                        {
                        FD_ZERO(&readfds);
#if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_NETWARE) && !defined(OPENSSL_SYS_BEOS_R5)
                        openssl_fdset(fileno(stdin),&readfds);
#endif
                        openssl_fdset(s,&readfds);
                        /* Note: under VMS with SOCKETSHR the second parameter is
                         * currently of type (int *) whereas under other systems
                         * it is (void *) if you don't have a cast it will choke
                         * the compiler: if you do have a cast then you can either
                         * go for (int *) or (void *).
                         */
#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_NETWARE)
                        /* Under DOS (non-djgpp) and Windows we can't select on stdin: only
                         * on sockets. As a workaround we timeout the select every
                         * second and check for any keypress. In a proper Windows
                         * application we wouldn't do this because it is inefficient.
                         */
                        tv.tv_sec = 1;
                        tv.tv_usec = 0;
                        i=select(width,(void *)&readfds,NULL,NULL,&tv);
                        if((i < 0) || (!i && !_kbhit() ) )continue;
                        if(_kbhit())
                                read_from_terminal = 1;
#elif defined(OPENSSL_SYS_BEOS_R5)
                        /* Under BeOS-R5 the situation is similar to DOS */
                        tv.tv_sec = 1;
                        tv.tv_usec = 0;
                        (void)fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
                        i=select(width,(void *)&readfds,NULL,NULL,&tv);
                        if ((i < 0) || (!i && read(fileno(stdin), buf, 0) < 0))
                                continue;
                        if (read(fileno(stdin), buf, 0) >= 0)
                                read_from_terminal = 1;
                        (void)fcntl(fileno(stdin), F_SETFL, 0);
#else
                        if ((SSL_version(con) == DTLS1_VERSION) &&
                                DTLSv1_get_timeout(con, &timeout))
                                timeoutp = &timeout;
                        else
                                timeoutp = NULL;

                        i=select(width,(void *)&readfds,NULL,NULL,timeoutp);

                        if ((SSL_version(con) == DTLS1_VERSION) && DTLSv1_handle_timeout(con) > 0)
                                {
                                BIO_printf(bio_err,"TIMEOUT occurred\n");
                                }

                        if (i <= 0) continue;
                        if (FD_ISSET(fileno(stdin),&readfds))
                                read_from_terminal = 1;
#endif
                        if (FD_ISSET(s,&readfds))
                                read_from_sslcon = 1;
                        }
                if (read_from_terminal)
                        {
                        if (s_crlf)
                                {
                                int j, lf_num;

                                i=raw_read_stdin(buf, bufsize/2);
                                lf_num = 0;
                                /* both loops are skipped when i <= 0 */
                                for (j = 0; j < i; j++)
                                        if (buf[j] == '\n')
                                                lf_num++;
                                for (j = i-1; j >= 0; j--)
                                        {
                                        buf[j+lf_num] = buf[j];
                                        if (buf[j] == '\n')
                                                {
                                                lf_num--;
                                                i++;
                                                buf[j+lf_num] = '\r';
                                                }
                                        }
                                assert(lf_num == 0);
                                }
                        else
                                i=raw_read_stdin(buf,bufsize);
                        if (!s_quiet && !s_brief)
                                {
                                if ((i <= 0) || (buf[0] == 'Q'))
                                        {
                                        BIO_printf(bio_s_out,"DONE\n");
                                        SHUTDOWN(s);
                                        close_accept_socket();
                                        ret= -11;
                                        goto err;
                                        }
                                if ((i <= 0) || (buf[0] == 'q'))
                                        {
                                        BIO_printf(bio_s_out,"DONE\n");
                                        if (SSL_version(con) != DTLS1_VERSION)
                        SHUTDOWN(s);
        /*                              close_accept_socket();
                                        ret= -11;*/
                                        goto err;
                                        }

#ifndef OPENSSL_NO_HEARTBEATS
                                if ((buf[0] == 'B') &&
                                        ((buf[1] == '\n') || (buf[1] == '\r')))
                                        {
                                        BIO_printf(bio_err,"HEARTBEATING\n");
                                        SSL_heartbeat(con);
                                        i=0;
                                        continue;
                                        }
#endif
                                if ((buf[0] == 'r') && 
                                        ((buf[1] == '\n') || (buf[1] == '\r')))
                                        {
                                        SSL_renegotiate(con);
                                        i=SSL_do_handshake(con);
                                        printf("SSL_do_handshake -> %d\n",i);
                                        i=0; /*13; */
                                        continue;
                                        /* strcpy(buf,"server side RE-NEGOTIATE\n"); */
                                        }
                                if ((buf[0] == 'R') &&
                                        ((buf[1] == '\n') || (buf[1] == '\r')))
                                        {
                                        SSL_set_verify(con,
                                                SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE,NULL);
                                        SSL_renegotiate(con);
                                        i=SSL_do_handshake(con);
                                        printf("SSL_do_handshake -> %d\n",i);
                                        i=0; /* 13; */
                                        continue;
                                        /* strcpy(buf,"server side RE-NEGOTIATE asking for client cert\n"); */
                                        }
                                if (buf[0] == 'P')
                                        {
                                        static const char *str="Lets print some clear text\n";
                                        BIO_write(SSL_get_wbio(con),str,strlen(str));
                                        }
                                if (buf[0] == 'S')
                                        {
                                        print_stats(bio_s_out,SSL_get_SSL_CTX(con));
                                        }
                                }
#ifdef CHARSET_EBCDIC
                        ebcdic2ascii(buf,buf,i);
#endif
                        l=k=0;
                        for (;;)
                                {
                                /* should do a select for the write */
#ifdef RENEG
{ static count=0; if (++count == 100) { count=0; SSL_renegotiate(con); } }
#endif
                                k=SSL_write(con,&(buf[l]),(unsigned int)i);
#ifndef OPENSSL_NO_SRP
                                while (SSL_get_error(con,k) == SSL_ERROR_WANT_X509_LOOKUP)
                                        {
                                        BIO_printf(bio_s_out,"LOOKUP renego during write\n");
                                        srp_callback_parm.user = SRP_VBASE_get_by_user(srp_callback_parm.vb, srp_callback_parm.login); 
                                        if (srp_callback_parm.user) 
                                                BIO_printf(bio_s_out,"LOOKUP done %s\n",srp_callback_parm.user->info);
                                        else 
                                                BIO_printf(bio_s_out,"LOOKUP not successful\n");
                                                k=SSL_write(con,&(buf[l]),(unsigned int)i);
                                        }
#endif
                                switch (SSL_get_error(con,k))
                                        {
                                case SSL_ERROR_NONE:
                                        break;
                                case SSL_ERROR_WANT_WRITE:
                                case SSL_ERROR_WANT_READ:
                                case SSL_ERROR_WANT_X509_LOOKUP:
                                        BIO_printf(bio_s_out,"Write BLOCK\n");
                                        break;
                                case SSL_ERROR_SYSCALL:
                                case SSL_ERROR_SSL:
                                        BIO_printf(bio_s_out,"ERROR\n");
                                        ERR_print_errors(bio_err);
                                        ret=1;
                                        goto err;
                                        /* break; */
                                case SSL_ERROR_ZERO_RETURN:
                                        BIO_printf(bio_s_out,"DONE\n");
                                        ret=1;
                                        goto err;
                                        }
                                l+=k;
                                i-=k;
                                if (i <= 0) break;
                                }
                        }
                if (read_from_sslcon)
                        {
                        if (!SSL_is_init_finished(con))
                                {
                                i=init_ssl_connection(con);
                                
                                if (i < 0)
                                        {
                                        ret=0;
                                        goto err;
                                        }
                                else if (i == 0)
                                        {
                                        ret=1;
                                        goto err;
                                        }
                                }
                        else
                                {
again:  
                                i=SSL_read(con,(char *)buf,bufsize);
#ifndef OPENSSL_NO_SRP
                                while (SSL_get_error(con,i) == SSL_ERROR_WANT_X509_LOOKUP)
                                        {
                                        BIO_printf(bio_s_out,"LOOKUP renego during read\n");
                                        srp_callback_parm.user = SRP_VBASE_get_by_user(srp_callback_parm.vb, srp_callback_parm.login); 
                                        if (srp_callback_parm.user) 
                                                BIO_printf(bio_s_out,"LOOKUP done %s\n",srp_callback_parm.user->info);
                                        else 
                                                BIO_printf(bio_s_out,"LOOKUP not successful\n");
                                        i=SSL_read(con,(char *)buf,bufsize);
                                        }
#endif
                                switch (SSL_get_error(con,i))
                                        {
                                case SSL_ERROR_NONE:
#ifdef CHARSET_EBCDIC
                                        ascii2ebcdic(buf,buf,i);
#endif
                                        raw_write_stdout(buf,
                                                (unsigned int)i);
                                        if (SSL_pending(con)) goto again;
                                        break;
                                case SSL_ERROR_WANT_WRITE:
                                case SSL_ERROR_WANT_READ:
                                        BIO_printf(bio_s_out,"Read BLOCK\n");
                                        break;
                                case SSL_ERROR_SYSCALL:
                                case SSL_ERROR_SSL:
                                        BIO_printf(bio_s_out,"ERROR\n");
                                        ERR_print_errors(bio_err);
                                        ret=1;
                                        goto err;
                                case SSL_ERROR_ZERO_RETURN:
                                        BIO_printf(bio_s_out,"DONE\n");
                                        ret=1;
                                        goto err;
                                        }
                                }
                        }
                }
err:
        if (con != NULL)
                {
                BIO_printf(bio_s_out,"shutting down SSL\n");
#if 1
                SSL_set_shutdown(con,SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
#else
                SSL_shutdown(con);
#endif
                SSL_free(con);
                }
        BIO_printf(bio_s_out,"CONNECTION CLOSED\n");
        if (buf != NULL)
                {
                OPENSSL_cleanse(buf,bufsize);
                OPENSSL_free(buf);
                }
        if (ret >= 0)
                BIO_printf(bio_s_out,"ACCEPT\n");
        return(ret);
        }

static void close_accept_socket(void)
        {
        BIO_printf(bio_err,"shutdown accept socket\n");
        if (accept_socket >= 0)
                {
                SHUTDOWN2(accept_socket);
                }
        }

static int init_ssl_connection(SSL *con)
        {
        int i;
        const char *str;
        X509 *peer;
        long verify_error;
        MS_STATIC char buf[BUFSIZ];
#ifndef OPENSSL_NO_KRB5
        char *client_princ;
#endif
#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
        const unsigned char *next_proto_neg;
        unsigned next_proto_neg_len;
#endif
        unsigned char *exportedkeymat;


        i=SSL_accept(con);
#ifdef CERT_CB_TEST_RETRY
        {
        while (i <= 0 && SSL_get_error(con,i) == SSL_ERROR_WANT_X509_LOOKUP && SSL_state(con) == SSL3_ST_SR_CLNT_HELLO_C) 
                {
                fprintf(stderr, "LOOKUP from certificate callback during accept\n");
                i=SSL_accept(con);
                }
        }
#endif
#ifndef OPENSSL_NO_SRP
        while (i <= 0 &&  SSL_get_error(con,i) == SSL_ERROR_WANT_X509_LOOKUP) 
                {
                        BIO_printf(bio_s_out,"LOOKUP during accept %s\n",srp_callback_parm.login);
                        srp_callback_parm.user = SRP_VBASE_get_by_user(srp_callback_parm.vb, srp_callback_parm.login); 
                        if (srp_callback_parm.user) 
                                BIO_printf(bio_s_out,"LOOKUP done %s\n",srp_callback_parm.user->info);
                        else 
                                BIO_printf(bio_s_out,"LOOKUP not successful\n");
                        i=SSL_accept(con);
                }
#endif

        if (i <= 0)
                {
                if (BIO_sock_should_retry(i))
                        {
                        BIO_printf(bio_s_out,"DELAY\n");
                        return(1);
                        }

                BIO_printf(bio_err,"ERROR\n");
                verify_error=SSL_get_verify_result(con);
                if (verify_error != X509_V_OK)
                        {
                        BIO_printf(bio_err,"verify error:%s\n",
                                X509_verify_cert_error_string(verify_error));
                        }
                /* Always print any error messages */
                ERR_print_errors(bio_err);
                return(0);
                }

        if (s_brief)
                print_ssl_summary(bio_err, con);

        PEM_write_bio_SSL_SESSION(bio_s_out,SSL_get_session(con));

        peer=SSL_get_peer_certificate(con);
        if (peer != NULL)
                {
                BIO_printf(bio_s_out,"Client certificate\n");
                PEM_write_bio_X509(bio_s_out,peer);
                X509_NAME_oneline(X509_get_subject_name(peer),buf,sizeof buf);
                BIO_printf(bio_s_out,"subject=%s\n",buf);
                X509_NAME_oneline(X509_get_issuer_name(peer),buf,sizeof buf);
                BIO_printf(bio_s_out,"issuer=%s\n",buf);
                X509_free(peer);
                }

        if (SSL_get_shared_ciphers(con,buf,sizeof buf) != NULL)
                BIO_printf(bio_s_out,"Shared ciphers:%s\n",buf);
        str=SSL_CIPHER_get_name(SSL_get_current_cipher(con));
        ssl_print_sigalgs(bio_s_out, con);
#ifndef OPENSSL_NO_EC
        ssl_print_point_formats(bio_s_out, con);
        ssl_print_curves(bio_s_out, con, 0);
#endif
        BIO_printf(bio_s_out,"CIPHER is %s\n",(str != NULL)?str:"(NONE)");

#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
        SSL_get0_next_proto_negotiated(con, &next_proto_neg, &next_proto_neg_len);
        if (next_proto_neg)
                {
                BIO_printf(bio_s_out,"NEXTPROTO is ");
                BIO_write(bio_s_out, next_proto_neg, next_proto_neg_len);
                BIO_printf(bio_s_out, "\n");
                }
#endif
        {
        SRTP_PROTECTION_PROFILE *srtp_profile
          = SSL_get_selected_srtp_profile(con);

        if(srtp_profile)
                BIO_printf(bio_s_out,"SRTP Extension negotiated, profile=%s\n",
                           srtp_profile->name);
        }
        if (SSL_cache_hit(con)) BIO_printf(bio_s_out,"Reused session-id\n");
        if (SSL_ctrl(con,SSL_CTRL_GET_FLAGS,0,NULL) &
                TLS1_FLAGS_TLS_PADDING_BUG)
                BIO_printf(bio_s_out,
                           "Peer has incorrect TLSv1 block padding\n");
#ifndef OPENSSL_NO_KRB5
        client_princ = kssl_ctx_get0_client_princ(SSL_get0_kssl_ctx(con));
        if (client_princ != NULL)
                {
                BIO_printf(bio_s_out,"Kerberos peer principal is %s\n",
                                                                client_princ);
                }
#endif /* OPENSSL_NO_KRB5 */
        BIO_printf(bio_s_out, "Secure Renegotiation IS%s supported\n",
                      SSL_get_secure_renegotiation_support(con) ? "" : " NOT");
        if (keymatexportlabel != NULL)
                {
                BIO_printf(bio_s_out, "Keying material exporter:\n");
                BIO_printf(bio_s_out, "    Label: '%s'\n", keymatexportlabel);
                BIO_printf(bio_s_out, "    Length: %i bytes\n",
                           keymatexportlen);
                exportedkeymat = OPENSSL_malloc(keymatexportlen);
                if (exportedkeymat != NULL)
                        {
                        if (!SSL_export_keying_material(con, exportedkeymat,
                                                        keymatexportlen,
                                                        keymatexportlabel,
                                                        strlen(keymatexportlabel),
                                                        NULL, 0, 0))
                                {
                                BIO_printf(bio_s_out, "    Error\n");
                                }
                        else
                                {
                                BIO_printf(bio_s_out, "    Keying material: ");
                                for (i=0; i<keymatexportlen; i++)
                                        BIO_printf(bio_s_out, "%02X",
                                                   exportedkeymat[i]);
                                BIO_printf(bio_s_out, "\n");
                                }
                        OPENSSL_free(exportedkeymat);
                        }
                }

        return(1);
        }

#ifndef OPENSSL_NO_DH
static DH *load_dh_param(const char *dhfile)
        {
        DH *ret=NULL;
        BIO *bio;

        if ((bio=BIO_new_file(dhfile,"r")) == NULL)
                goto err;
        ret=PEM_read_bio_DHparams(bio,NULL,NULL,NULL);
err:
        if (bio != NULL) BIO_free(bio);
        return(ret);
        }
#endif

#if 0
static int load_CA(SSL_CTX *ctx, char *file)
        {
        FILE *in;
        X509 *x=NULL;

        if ((in=fopen(file,"r")) == NULL)
                return(0);

        for (;;)
                {
                if (PEM_read_X509(in,&x,NULL) == NULL)
                        break;
                SSL_CTX_add_client_CA(ctx,x);
                }
        if (x != NULL) X509_free(x);
        fclose(in);
        return(1);
        }
#endif

static int www_body(char *hostname, int s, int stype, unsigned char *context)
        {
        char *buf=NULL;
        int ret=1;
        int i,j,k,dot;
        SSL *con;
        const SSL_CIPHER *c;
        BIO *io,*ssl_bio,*sbio;
#ifndef OPENSSL_NO_KRB5
        KSSL_CTX *kctx;
#endif

        buf=OPENSSL_malloc(bufsize);
        if (buf == NULL) return(0);
        io=BIO_new(BIO_f_buffer());
        ssl_bio=BIO_new(BIO_f_ssl());
        if ((io == NULL) || (ssl_bio == NULL)) goto err;

#ifdef FIONBIO  
        if (s_nbio)
                {
                unsigned long sl=1;

                if (!s_quiet)
                        BIO_printf(bio_err,"turning on non blocking io\n");
                if (BIO_socket_ioctl(s,FIONBIO,&sl) < 0)
                        ERR_print_errors(bio_err);
                }
#endif

        /* lets make the output buffer a reasonable size */
        if (!BIO_set_write_buffer_size(io,bufsize)) goto err;

        if ((con=SSL_new(ctx)) == NULL) goto err;
#ifndef OPENSSL_NO_TLSEXT
                if (s_tlsextdebug)
                        {
                        SSL_set_tlsext_debug_callback(con, tlsext_cb);
                        SSL_set_tlsext_debug_arg(con, bio_s_out);
                        }
#endif
#ifndef OPENSSL_NO_KRB5
        if ((kctx = kssl_ctx_new()) != NULL)
                {
                kssl_ctx_setstring(kctx, KSSL_SERVICE, KRB5SVC);
                kssl_ctx_setstring(kctx, KSSL_KEYTAB, KRB5KEYTAB);
                }
#endif  /* OPENSSL_NO_KRB5 */
        if(context) SSL_set_session_id_context(con, context,
                                               strlen((char *)context));

        sbio=BIO_new_socket(s,BIO_NOCLOSE);
        if (s_nbio_test)
                {
                BIO *test;

                test=BIO_new(BIO_f_nbio_test());
                sbio=BIO_push(test,sbio);
                }
        SSL_set_bio(con,sbio,sbio);
        SSL_set_accept_state(con);

        /* SSL_set_fd(con,s); */
        BIO_set_ssl(ssl_bio,con,BIO_CLOSE);
        BIO_push(io,ssl_bio);
#ifdef CHARSET_EBCDIC
        io = BIO_push(BIO_new(BIO_f_ebcdic_filter()),io);
#endif

        if (s_debug)
                {
                SSL_set_debug(con, 1);
                BIO_set_callback(SSL_get_rbio(con),bio_dump_callback);
                BIO_set_callback_arg(SSL_get_rbio(con),(char *)bio_s_out);
                }
        if (s_msg)
                {
#ifndef OPENSSL_NO_SSL_TRACE
                if (s_msg == 2)
                        SSL_set_msg_callback(con, SSL_trace);
                else
#endif
                        SSL_set_msg_callback(con, msg_cb);
                SSL_set_msg_callback_arg(con, bio_s_msg ? bio_s_msg : bio_s_out);
                }

        for (;;)
                {
                if (hack)
                        {
                        i=SSL_accept(con);
#ifndef OPENSSL_NO_SRP
                        while (i <= 0 &&  SSL_get_error(con,i) == SSL_ERROR_WANT_X509_LOOKUP) 
                {
                        BIO_printf(bio_s_out,"LOOKUP during accept %s\n",srp_callback_parm.login);
                        srp_callback_parm.user = SRP_VBASE_get_by_user(srp_callback_parm.vb, srp_callback_parm.login); 
                        if (srp_callback_parm.user) 
                                BIO_printf(bio_s_out,"LOOKUP done %s\n",srp_callback_parm.user->info);
                        else 
                                BIO_printf(bio_s_out,"LOOKUP not successful\n");
                        i=SSL_accept(con);
                }
#endif
                        switch (SSL_get_error(con,i))
                                {
                        case SSL_ERROR_NONE:
                                break;
                        case SSL_ERROR_WANT_WRITE:
                        case SSL_ERROR_WANT_READ:
                        case SSL_ERROR_WANT_X509_LOOKUP:
                                continue;
                        case SSL_ERROR_SYSCALL:
                        case SSL_ERROR_SSL:
                        case SSL_ERROR_ZERO_RETURN:
                                ret=1;
                                goto err;
                                /* break; */
                                }

                        SSL_renegotiate(con);
                        SSL_write(con,NULL,0);
                        }

                i=BIO_gets(io,buf,bufsize-1);
                if (i < 0) /* error */
                        {
                        if (!BIO_should_retry(io))
                                {
                                if (!s_quiet)
                                        ERR_print_errors(bio_err);
                                goto err;
                                }
                        else
                                {
                                BIO_printf(bio_s_out,"read R BLOCK\n");
#if defined(OPENSSL_SYS_NETWARE)
            delay(1000);
#elif !defined(OPENSSL_SYS_MSDOS)
                                sleep(1);
#endif
                                continue;
                                }
                        }
                else if (i == 0) /* end of input */
                        {
                        ret=1;
                        goto end;
                        }

                /* else we have data */
                if (    ((www == 1) && (strncmp("GET ",buf,4) == 0)) ||
                        ((www == 2) && (strncmp("GET /stats ",buf,10) == 0)))
                        {
                        char *p;
                        X509 *peer;
                        STACK_OF(SSL_CIPHER) *sk;
                        static const char *space="                          ";

                if (www == 1 && strncmp("GET /reneg", buf, 10) == 0)
                        {
                        if (strncmp("GET /renegcert", buf, 14) == 0)
                                SSL_set_verify(con,
                                SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE,NULL);
                        i=SSL_renegotiate(con);
                        BIO_printf(bio_s_out, "SSL_renegotiate -> %d\n",i);
                        i=SSL_do_handshake(con);
                        if (i <= 0)
                                {
                                BIO_printf(bio_s_out, "SSL_do_handshake() Retval %d\n", SSL_get_error(con, i));
                                ERR_print_errors(bio_err);
                                goto err;
                                }
                        /* EVIL HACK! */
                        SSL_set_state(con, SSL_ST_ACCEPT);
                        i=SSL_do_handshake(con);
                        BIO_printf(bio_s_out, "SSL_do_handshake -> %d\n",i);
                        if (i <= 0)
                                {
                                BIO_printf(bio_s_out, "SSL_do_handshake() Retval %d\n", SSL_get_error(con, i));
                                ERR_print_errors(bio_err);
                                goto err;
                                }
                        }

                        BIO_puts(io,"HTTP/1.0 200 ok\r\nContent-type: text/html\r\n\r\n");
                        BIO_puts(io,"<HTML><BODY BGCOLOR=\"#ffffff\">\n");
                        BIO_puts(io,"<pre>\n");
/*                      BIO_puts(io,SSLeay_version(SSLEAY_VERSION));*/
                        BIO_puts(io,"\n");
                        for (i=0; i<local_argc; i++)
                                {
                                BIO_puts(io,local_argv[i]);
                                BIO_write(io," ",1);
                                }
                        BIO_puts(io,"\n");

                        BIO_printf(io,
                                "Secure Renegotiation IS%s supported\n",
                                SSL_get_secure_renegotiation_support(con) ?
                                                        "" : " NOT");

                        /* The following is evil and should not really
                         * be done */
                        BIO_printf(io,"Ciphers supported in s_server binary\n");
                        sk=SSL_get_ciphers(con);
                        j=sk_SSL_CIPHER_num(sk);
                        for (i=0; i<j; i++)
                                {
                                c=sk_SSL_CIPHER_value(sk,i);
                                BIO_printf(io,"%-11s:%-25s",
                                        SSL_CIPHER_get_version(c),
                                        SSL_CIPHER_get_name(c));
                                if ((((i+1)%2) == 0) && (i+1 != j))
                                        BIO_puts(io,"\n");
                                }
                        BIO_puts(io,"\n");
                        p=SSL_get_shared_ciphers(con,buf,bufsize);
                        if (p != NULL)
                                {
                                BIO_printf(io,"---\nCiphers common between both SSL end points:\n");
                                j=i=0;
                                while (*p)
                                        {
                                        if (*p == ':')
                                                {
                                                BIO_write(io,space,26-j);
                                                i++;
                                                j=0;
                                                BIO_write(io,((i%3)?" ":"\n"),1);
                                                }
                                        else
                                                {
                                                BIO_write(io,p,1);
                                                j++;
                                                }
                                        p++;
                                        }
                                BIO_puts(io,"\n");
                                }
                        ssl_print_sigalgs(io, con);
#ifndef OPENSSL_NO_EC
                        ssl_print_curves(io, con, 0);
#endif
                        BIO_printf(io,(SSL_cache_hit(con)
                                ?"---\nReused, "
                                :"---\nNew, "));
                        c=SSL_get_current_cipher(con);
                        BIO_printf(io,"%s, Cipher is %s\n",
                                SSL_CIPHER_get_version(c),
                                SSL_CIPHER_get_name(c));
                        SSL_SESSION_print(io,SSL_get_session(con));
                        BIO_printf(io,"---\n");
                        print_stats(io,SSL_get_SSL_CTX(con));
                        BIO_printf(io,"---\n");
                        peer=SSL_get_peer_certificate(con);
                        if (peer != NULL)
                                {
                                BIO_printf(io,"Client certificate\n");
                                X509_print(io,peer);
                                PEM_write_bio_X509(io,peer);
                                }
                        else
                                BIO_puts(io,"no client certificate available\n");
                        BIO_puts(io,"</BODY></HTML>\r\n\r\n");
                        break;
                        }
                else if ((www == 2 || www == 3)
                         && (strncmp("GET /",buf,5) == 0))
                        {
                        BIO *file;
                        char *p,*e;
                        static const char *text="HTTP/1.0 200 ok\r\nContent-type: text/plain\r\n\r\n";

                        /* skip the '/' */
                        p= &(buf[5]);

                        dot = 1;
                        for (e=p; *e != '\0'; e++)
                                {
                                if (e[0] == ' ')
                                        break;

                                switch (dot)
                                        {
                                case 1:
                                        dot = (e[0] == '.') ? 2 : 0;
                                        break;
                                case 2:
                                        dot = (e[0] == '.') ? 3 : 0;
                                        break;
                                case 3:
                                        dot = (e[0] == '/') ? -1 : 0;
                                        break;
                                        }
                                if (dot == 0)
                                        dot = (e[0] == '/') ? 1 : 0;
                                }
                        dot = (dot == 3) || (dot == -1); /* filename contains ".." component */

                        if (*e == '\0')
                                {
                                BIO_puts(io,text);
                                BIO_printf(io,"'%s' is an invalid file name\r\n",p);
                                break;
                                }
                        *e='\0';

                        if (dot)
                                {
                                BIO_puts(io,text);
                                BIO_printf(io,"'%s' contains '..' reference\r\n",p);
                                break;
                                }

                        if (*p == '/')
                                {
                                BIO_puts(io,text);
                                BIO_printf(io,"'%s' is an invalid path\r\n",p);
                                break;
                                }

#if 0
                        /* append if a directory lookup */
                        if (e[-1] == '/')
                                strcat(p,"index.html");
#endif

                        /* if a directory, do the index thang */
                        if (app_isdir(p)>0)
                                {
#if 0 /* must check buffer size */
                                strcat(p,"/index.html");
#else
                                BIO_puts(io,text);
                                BIO_printf(io,"'%s' is a directory\r\n",p);
                                break;
#endif
                                }

                        if ((file=BIO_new_file(p,"r")) == NULL)
                                {
                                BIO_puts(io,text);
                                BIO_printf(io,"Error opening '%s'\r\n",p);
                                ERR_print_errors(io);
                                break;
                                }

                        if (!s_quiet)
                                BIO_printf(bio_err,"FILE:%s\n",p);

                        if (www == 2)
                                {
                                i=strlen(p);
                                if (    ((i > 5) && (strcmp(&(p[i-5]),".html") == 0)) ||
                                        ((i > 4) && (strcmp(&(p[i-4]),".php") == 0)) ||
                                        ((i > 4) && (strcmp(&(p[i-4]),".htm") == 0)))
                                        BIO_puts(io,"HTTP/1.0 200 ok\r\nContent-type: text/html\r\n\r\n");
                                else
                                        BIO_puts(io,"HTTP/1.0 200 ok\r\nContent-type: text/plain\r\n\r\n");
                                }
                        /* send the file */
                        for (;;)
                                {
                                i=BIO_read(file,buf,bufsize);
                                if (i <= 0) break;

#ifdef RENEG
                                total_bytes+=i;
                                fprintf(stderr,"%d\n",i);
                                if (total_bytes > 3*1024)
                                        {
                                        total_bytes=0;
                                        fprintf(stderr,"RENEGOTIATE\n");
                                        SSL_renegotiate(con);
                                        }
#endif

                                for (j=0; j<i; )
                                        {
#ifdef RENEG
{ static count=0; if (++count == 13) { SSL_renegotiate(con); } }
#endif
                                        k=BIO_write(io,&(buf[j]),i-j);
                                        if (k <= 0)
                                                {
                                                if (!BIO_should_retry(io))
                                                        goto write_error;
                                                else
                                                        {
                                                        BIO_printf(bio_s_out,"rwrite W BLOCK\n");
                                                        }
                                                }
                                        else
                                                {
                                                j+=k;
                                                }
                                        }
                                }
write_error:
                        BIO_free(file);
                        break;
                        }
                }

        for (;;)
                {
                i=(int)BIO_flush(io);
                if (i <= 0)
                        {
                        if (!BIO_should_retry(io))
                                break;
                        }
                else
                        break;
                }
end:
#if 1
        /* make sure we re-use sessions */
        SSL_set_shutdown(con,SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
#else
        /* This kills performance */
/*      SSL_shutdown(con); A shutdown gets sent in the
 *      BIO_free_all(io) procession */
#endif

err:

        if (ret >= 0)
                BIO_printf(bio_s_out,"ACCEPT\n");

        if (buf != NULL) OPENSSL_free(buf);
        if (io != NULL) BIO_free_all(io);
/*      if (ssl_bio != NULL) BIO_free(ssl_bio);*/
        return(ret);
        }

static int rev_body(char *hostname, int s, int stype, unsigned char *context)
        {
        char *buf=NULL;
        int i;
        int ret=1;
        SSL *con;
        BIO *io,*ssl_bio,*sbio;
#ifndef OPENSSL_NO_KRB5
        KSSL_CTX *kctx;
#endif

        buf=OPENSSL_malloc(bufsize);
        if (buf == NULL) return(0);
        io=BIO_new(BIO_f_buffer());
        ssl_bio=BIO_new(BIO_f_ssl());
        if ((io == NULL) || (ssl_bio == NULL)) goto err;

        /* lets make the output buffer a reasonable size */
        if (!BIO_set_write_buffer_size(io,bufsize)) goto err;

        if ((con=SSL_new(ctx)) == NULL) goto err;
#ifndef OPENSSL_NO_TLSEXT
        if (s_tlsextdebug)
                {
                SSL_set_tlsext_debug_callback(con, tlsext_cb);
                SSL_set_tlsext_debug_arg(con, bio_s_out);
                }
#endif
#ifndef OPENSSL_NO_KRB5
        if ((kctx = kssl_ctx_new()) != NULL)
                {
                kssl_ctx_setstring(kctx, KSSL_SERVICE, KRB5SVC);
                kssl_ctx_setstring(kctx, KSSL_KEYTAB, KRB5KEYTAB);
                }
#endif  /* OPENSSL_NO_KRB5 */
        if(context) SSL_set_session_id_context(con, context,
                                               strlen((char *)context));

        sbio=BIO_new_socket(s,BIO_NOCLOSE);
        SSL_set_bio(con,sbio,sbio);
        SSL_set_accept_state(con);

        BIO_set_ssl(ssl_bio,con,BIO_CLOSE);
        BIO_push(io,ssl_bio);
#ifdef CHARSET_EBCDIC
        io = BIO_push(BIO_new(BIO_f_ebcdic_filter()),io);
#endif

        if (s_debug)
                {
                SSL_set_debug(con, 1);
                BIO_set_callback(SSL_get_rbio(con),bio_dump_callback);
                BIO_set_callback_arg(SSL_get_rbio(con),(char *)bio_s_out);
                }
        if (s_msg)
                {
#ifndef OPENSSL_NO_SSL_TRACE
                if (s_msg == 2)
                        SSL_set_msg_callback(con, SSL_trace);
                else
#endif
                        SSL_set_msg_callback(con, msg_cb);
                SSL_set_msg_callback_arg(con, bio_s_msg ? bio_s_msg : bio_s_out);
                }

        for (;;)
                {
                i = BIO_do_handshake(io);
                if (i > 0)
                        break;
                if (!BIO_should_retry(io))
                        {
                        BIO_puts(bio_err, "CONNECTION FAILURE\n");
                        ERR_print_errors(bio_err);
                        goto end;
                        }
                }
        BIO_printf(bio_err, "CONNECTION ESTABLISHED\n");
        print_ssl_summary(bio_err, con);

        for (;;)
                {
                i=BIO_gets(io,buf,bufsize-1);
                if (i < 0) /* error */
                        {
                        if (!BIO_should_retry(io))
                                {
                                if (!s_quiet)
                                        ERR_print_errors(bio_err);
                                goto err;
                                }
                        else
                                {
                                BIO_printf(bio_s_out,"read R BLOCK\n");
#if defined(OPENSSL_SYS_NETWARE)
            delay(1000);
#elif !defined(OPENSSL_SYS_MSDOS)
                                sleep(1);
#endif
                                continue;
                                }
                        }
                else if (i == 0) /* end of input */
                        {
                        ret=1;
                        BIO_printf(bio_err, "CONNECTION CLOSED\n");
                        goto end;
                        }
                else
                        {
                        char *p = buf + i - 1;
                        while(i && (*p == '\n' || *p == '\r'))
                                {
                                p--;
                                i--;
                                }
                        if (!s_ign_eof && i == 5 && !strncmp(buf, "CLOSE", 5))
                                {
                                ret = 1;
                                BIO_printf(bio_err, "CONNECTION CLOSED\n");
                                goto end;
                                }
                        BUF_reverse((unsigned char *)buf, NULL, i);
                        buf[i] = '\n';
                        BIO_write(io, buf, i + 1);
                        for (;;)
                                {
                                i = BIO_flush(io);
                                if (i > 0)
                                        break;
                                if (!BIO_should_retry(io))
                                        goto end;
                                }
                        }
                }
end:
        /* make sure we re-use sessions */
        SSL_set_shutdown(con,SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);

err:

        if (buf != NULL) OPENSSL_free(buf);
        if (io != NULL) BIO_free_all(io);
        return(ret);
        }

#ifndef OPENSSL_NO_RSA
static RSA MS_CALLBACK *tmp_rsa_cb(SSL *s, int is_export, int keylength)
        {
        BIGNUM *bn = NULL;
        static RSA *rsa_tmp=NULL;

        if (!rsa_tmp && ((bn = BN_new()) == NULL))
                BIO_printf(bio_err,"Allocation error in generating RSA key\n");
        if (!rsa_tmp && bn)
                {
                if (!s_quiet)
                        {
                        BIO_printf(bio_err,"Generating temp (%d bit) RSA key...",keylength);
                        (void)BIO_flush(bio_err);
                        }
                if(!BN_set_word(bn, RSA_F4) || ((rsa_tmp = RSA_new()) == NULL) ||
                                !RSA_generate_key_ex(rsa_tmp, keylength, bn, NULL))
                        {
                        if(rsa_tmp) RSA_free(rsa_tmp);
                        rsa_tmp = NULL;
                        }
                if (!s_quiet)
                        {
                        BIO_printf(bio_err,"\n");
                        (void)BIO_flush(bio_err);
                        }
                BN_free(bn);
                }
        return(rsa_tmp);
        }
#endif

#define MAX_SESSION_ID_ATTEMPTS 10
static int generate_session_id(const SSL *ssl, unsigned char *id,
                                unsigned int *id_len)
        {
        unsigned int count = 0;
        do      {
                RAND_pseudo_bytes(id, *id_len);
                /* Prefix the session_id with the required prefix. NB: If our
                 * prefix is too long, clip it - but there will be worse effects
                 * anyway, eg. the server could only possibly create 1 session
                 * ID (ie. the prefix!) so all future session negotiations will
                 * fail due to conflicts. */
                memcpy(id, session_id_prefix,
                        (strlen(session_id_prefix) < *id_len) ?
                        strlen(session_id_prefix) : *id_len);
                }
        while(SSL_has_matching_session_id(ssl, id, *id_len) &&
                (++count < MAX_SESSION_ID_ATTEMPTS));
        if(count >= MAX_SESSION_ID_ATTEMPTS)
                return 0;
        return 1;
        }

/* By default s_server uses an in-memory cache which caches SSL_SESSION
 * structures without any serialisation. This hides some bugs which only
 * become apparent in deployed servers. By implementing a basic external
 * session cache some issues can be debugged using s_server.
 */

typedef struct simple_ssl_session_st
        {
        unsigned char *id;
        unsigned int idlen;
        unsigned char *der;
        int derlen;
        struct simple_ssl_session_st *next;
        } simple_ssl_session;

static simple_ssl_session *first = NULL;

static int add_session(SSL *ssl, SSL_SESSION *session)
        {
        simple_ssl_session *sess;
        unsigned char *p;

        sess = OPENSSL_malloc(sizeof(simple_ssl_session));

        SSL_SESSION_get_id(session, &sess->idlen);
        sess->derlen = i2d_SSL_SESSION(session, NULL);

        sess->id = BUF_memdup(SSL_SESSION_get_id(session, NULL), sess->idlen);

        sess->der = OPENSSL_malloc(sess->derlen);
        p = sess->der;
        i2d_SSL_SESSION(session, &p);

        sess->next = first;
        first = sess;
        BIO_printf(bio_err, "New session added to external cache\n");
        return 0;
        }

static SSL_SESSION *get_session(SSL *ssl, unsigned char *id, int idlen,
                                        int *do_copy)
        {
        simple_ssl_session *sess;
        *do_copy = 0;
        for (sess = first; sess; sess = sess->next)
                {
                if (idlen == (int)sess->idlen && !memcmp(sess->id, id, idlen))
                        {
                        const unsigned char *p = sess->der;
                        BIO_printf(bio_err, "Lookup session: cache hit\n");
                        return d2i_SSL_SESSION(NULL, &p, sess->derlen);
                        }
                }
        BIO_printf(bio_err, "Lookup session: cache miss\n");
        return NULL;
        }

static void del_session(SSL_CTX *sctx, SSL_SESSION *session)
        {
        simple_ssl_session *sess, *prev = NULL;
        const unsigned char *id;
        unsigned int idlen;
        id = SSL_SESSION_get_id(session, &idlen);       
        for (sess = first; sess; sess = sess->next)
                {
                if (idlen == sess->idlen && !memcmp(sess->id, id, idlen))
                        {
                        if(prev)
                                prev->next = sess->next;
                        else
                                first = sess->next;
                        OPENSSL_free(sess->id);
                        OPENSSL_free(sess->der);
                        OPENSSL_free(sess);
                        return;
                        }
                prev = sess;
                }
        }

static void init_session_cache_ctx(SSL_CTX *sctx)
        {
        SSL_CTX_set_session_cache_mode(sctx,
                        SSL_SESS_CACHE_NO_INTERNAL|SSL_SESS_CACHE_SERVER);
        SSL_CTX_sess_set_new_cb(sctx, add_session);
        SSL_CTX_sess_set_get_cb(sctx, get_session);
        SSL_CTX_sess_set_remove_cb(sctx, del_session);
        }

static void free_sessions(void)
        {
        simple_ssl_session *sess, *tsess;
        for (sess = first; sess;)
                {
                OPENSSL_free(sess->id);
                OPENSSL_free(sess->der);
                tsess = sess;
                sess = sess->next;
                OPENSSL_free(tsess);
                }
        first = NULL;
        }