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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) 1998-2001 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.
 */

/* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <sys/stat.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
#include "s_apps.h"
#include "timeouts.h"

#ifdef OPENSSL_SYS_WINCE
/* Windows CE incorrectly defines fileno as returning void*, so to avoid problems below... */
#ifdef fileno
#undef fileno
#endif
#define fileno(a) (int)_fileno(a)
#endif

#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

#ifndef OPENSSL_NO_RSA
static RSA MS_CALLBACK *tmp_rsa_cb(SSL *s, int is_export, int keylength);
#endif
static int sv_body(char *hostname, int s, unsigned char *context);
static int www_body(char *hostname, int s, 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);
#ifndef OPENSSL_NO_DH
static DH *load_dh_param(const char *dhfile);
static DH *get_dh512(void);
#endif

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

#ifndef S_ISDIR
# if defined(_S_IFMT) && defined(_S_IFDIR)
#  define S_ISDIR(a)    (((a) & _S_IFMT) == _S_IFDIR)
# else
#  define S_ISDIR(a)    (((a) & S_IFMT) == S_IFDIR)
# endif
#endif

#ifndef OPENSSL_NO_DH
static unsigned char dh512_p[]={
      0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75,
      0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F,
      0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3,
      0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12,
      0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C,
      0x47,0x74,0xE8,0x33,
      };
static unsigned char dh512_g[]={
      0x02,
      };

static DH *get_dh512(void)
      {
      DH *dh=NULL;

      if ((dh=DH_new()) == NULL) return(NULL);
      dh->p=BN_bin2bn(dh512_p,sizeof(dh512_p),NULL);
      dh->g=BN_bin2bn(dh512_g,sizeof(dh512_g),NULL);
      if ((dh->p == NULL) || (dh->g == NULL))
            return(NULL);
      return(dh);
      }
#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;

static char *cipher=NULL;
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;
#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;
#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 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 s_msg=0;
static int s_quiet=0;

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;
#ifdef mtu
#undef mtu
#endif
static long mtu;
static int cert_chain = 0;


#ifdef MONOLITH
static void s_server_init(void)
      {
      accept_socket=-1;
      cipher=NULL;
      s_server_verify=SSL_VERIFY_NONE;
      s_dcert_file=NULL;
      s_dkey_file=NULL;
      s_cert_file=TEST_CERT;
      s_key_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;
      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 arg   - port to accept on (default is %d)\n",PORT);
      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," -cert arg     - certificate file to use\n");
      BIO_printf(bio_err,"                 (default is %s)\n",TEST_CERT);
      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 sect163r2).\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," -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");
      BIO_printf(bio_err," -ssl2         - Just talk SSLv2\n");
      BIO_printf(bio_err," -ssl3         - Just talk SSLv3\n");
      BIO_printf(bio_err," -tls1         - Just talk TLSv1\n");
      BIO_printf(bio_err," -dtls1        - Just talk DTLSv1\n");
      BIO_printf(bio_err," -timeout      - Enable timeouts\n");
      BIO_printf(bio_err," -mtu          - Set 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");
#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," -bugs         - Turn on SSL bug compatibility\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");
#endif
      }

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 (strcmp(servername,p->servername)) 
                  return p->extension_error;
            if (ctx2)
                  {
                  BIO_printf(p->biodebug,"Swiching 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 *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_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_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,
                              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;
      }
#endif
int MAIN(int, char **);

#ifndef OPENSSL_NO_JPAKE
static char *jpake_secret = NULL;
#endif

int MAIN(int argc, char *argv[])
      {
      X509_STORE *store = NULL;
      int vflags = 0;
      short port=PORT;
      char *CApath=NULL,*CAfile=NULL;
      unsigned char *context = NULL;
      char *dhfile = NULL;
#ifndef OPENSSL_NO_ECDH
      char *named_curve = NULL;
#endif
      int badop=0,bugs=0;
      int ret=1;
      int off=0;
      int no_tmp_rsa=0,no_dhe=0,no_ecdhe=0,nocert=0;
      int state=0;
      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;
      EVP_PKEY *s_key = NULL, *s_dkey = NULL;
#ifndef OPENSSL_NO_TLSEXT
      EVP_PKEY *s_key2 = NULL;
      X509 *s_cert2 = NULL;
#endif
#ifndef OPENSSL_NO_TLSEXT
        tlsextctx tlsextcbp = {NULL, NULL, SSL_TLSEXT_ERR_ALERT_WARNING};
#endif

#if !defined(OPENSSL_NO_SSL2) && !defined(OPENSSL_NO_SSL3)
      meth=SSLv23_server_method();
#elif !defined(OPENSSL_NO_SSL3)
      meth=SSLv3_server_method();
#elif !defined(OPENSSL_NO_SSL2)
      meth=SSLv2_server_method();
#endif

      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;

      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,"-verify") == 0)
                  {
                  s_server_verify=SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE;
                  if (--argc < 1) goto bad;
                  verify_depth=atoi(*(++argv));
                  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));
                  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,"-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,"-dhparam") == 0)
                  {
                  if (--argc < 1) goto bad;
                  dhfile = *(++argv);
                  }
#ifndef OPENSSL_NO_ECDH       
            else if     (strcmp(*argv,"-named_curve") == 0)
                  {
                  if (--argc < 1) goto bad;
                  named_curve = *(++argv);
                  }
#endif
            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,"-nocert") == 0)
                  {
                  nocert=1;
                  }
            else if     (strcmp(*argv,"-CApath") == 0)
                  {
                  if (--argc < 1) goto bad;
                  CApath= *(++argv);
                  }
            else if (strcmp(*argv,"-crl_check") == 0)
                  {
                  vflags |= X509_V_FLAG_CRL_CHECK;
                  }
            else if (strcmp(*argv,"-crl_check_all") == 0)
                  {
                  vflags |= X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL;
                  }
            else if     (strcmp(*argv,"-serverpref") == 0)
                  { off|=SSL_OP_CIPHER_SERVER_PREFERENCE; }
            else if     (strcmp(*argv,"-cipher") == 0)
                  {
                  if (--argc < 1) goto bad;
                  cipher= *(++argv);
                  }
            else if     (strcmp(*argv,"-CAfile") == 0)
                  {
                  if (--argc < 1) goto bad;
                  CAfile= *(++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,"-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,"-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,"-bugs") == 0)
                  { bugs=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,"-www") == 0)
                  { www=1; }
            else if     (strcmp(*argv,"-WWW") == 0)
                  { www=2; }
            else if     (strcmp(*argv,"-HTTP") == 0)
                  { www=3; }
            else if     (strcmp(*argv,"-no_ssl2") == 0)
                  { off|=SSL_OP_NO_SSLv2; }
            else if     (strcmp(*argv,"-no_ssl3") == 0)
                  { off|=SSL_OP_NO_SSLv3; }
            else if     (strcmp(*argv,"-no_tls1") == 0)
                  { off|=SSL_OP_NO_TLSv1; }
#ifndef OPENSSL_NO_TLSEXT
            else if     (strcmp(*argv,"-no_ticket") == 0)
                  { off|=SSL_OP_NO_TICKET; }
#endif
#ifndef OPENSSL_NO_SSL2
            else if     (strcmp(*argv,"-ssl2") == 0)
                  { meth=SSLv2_server_method(); }
#endif
#ifndef OPENSSL_NO_SSL3
            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(); }
#endif
#ifndef OPENSSL_NO_DTLS1
            else if     (strcmp(*argv,"-dtls1") == 0)
                  { 
                  meth=DTLSv1_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;
                  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);
                  }
                  
#endif
#ifndef OPENSSL_NO_JPAKE
            else if (strcmp(*argv,"-jpake") == 0)
                  {
                  if (--argc < 1) goto bad;
                  jpake_secret = *(++argv);
                  }
#endif
            else
                  {
                  BIO_printf(bio_err,"unknown option %s\n",*argv);
                  badop=1;
                  break;
                  }
            argc--;
            argv++;
            }
      if (badop)
            {
bad:
            sv_usage();
            goto end;
            }

      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 (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;
                  }

#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
            }
      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 (!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 && !s_msg)
                  {
                  bio_s_out=BIO_new(BIO_s_null());
                  }
            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 (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 (bugs) SSL_CTX_set_options(ctx,SSL_OP_ALL);
      if (hack) SSL_CTX_set_options(ctx,SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG);
      SSL_CTX_set_options(ctx,off);
      /* 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);

      SSL_CTX_sess_set_cache_size(ctx,128);

#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; */
            }
      store = SSL_CTX_get_cert_store(ctx);
      X509_STORE_set_flags(store, vflags);
#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 (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 (bugs) SSL_CTX_set_options(ctx2,SSL_OP_ALL);
            if (hack) SSL_CTX_set_options(ctx2,SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG);
            SSL_CTX_set_options(ctx2,off);

            /* 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);

            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);
                  }
            store = SSL_CTX_get_cert_store(ctx2);
            X509_STORE_set_flags(store, vflags);
            }
#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");
                  dh=get_dh512();
                  }
            (void)BIO_flush(bio_s_out);

            SSL_CTX_set_tmp_dh(ctx,dh);
#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;
                              }
                        }
                  SSL_CTX_set_tmp_dh(ctx2,dh);
                  }
#endif
            DH_free(dh);
            }
#endif

#ifndef OPENSSL_NO_ECDH
      if (!no_ecdhe)
            {
            EC_KEY *ecdh=NULL;

            if (named_curve)
                  {
                  int nid = OBJ_sn2nid(named_curve);

                  if (nid == 0)
                        {
                        BIO_printf(bio_err, "unknown curve name (%s)\n", 
                              named_curve);
                        goto end;
                        }
                  ecdh = EC_KEY_new_by_curve_name(nid);
                  if (ecdh == NULL)
                        {
                        BIO_printf(bio_err, "unable to create curve (%s)\n", 
                              named_curve);
                        goto end;
                        }
                  }

            if (ecdh != NULL)
                  {
                  BIO_printf(bio_s_out,"Setting temp ECDH parameters\n");
                  }
            else
                  {
                  BIO_printf(bio_s_out,"Using default temp ECDH parameters\n");
                  ecdh = EC_KEY_new_by_curve_name(NID_sect163r2);
                  if (ecdh == NULL) 
                        {
                        BIO_printf(bio_err, "unable to create curve (sect163r2)\n");
                        goto end;
                        }
                  }
            (void)BIO_flush(bio_s_out);

            SSL_CTX_set_tmp_ecdh(ctx,ecdh);
#ifndef OPENSSL_NO_TLSEXT
            if (ctx2) 
                  SSL_CTX_set_tmp_ecdh(ctx2,ecdh);
#endif
            EC_KEY_free(ecdh);
            }
#endif
      
      if (!set_cert_key_stuff(ctx,s_cert,s_key))
            goto end;
#ifndef OPENSSL_NO_TLSEXT
      if (ctx2 && !set_cert_key_stuff(ctx2,s_cert2,s_key2))
            goto end; 
#endif
      if (s_dcert != NULL)
            {
            if (!set_cert_key_stuff(ctx,s_dcert,s_dkey))
                  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 (cipher != NULL)
            if(!SSL_CTX_set_cipher_list(ctx,cipher)) {
            BIO_printf(bio_err,"error setting cipher list\n");
            ERR_print_errors(bio_err);
            goto end;
#ifndef OPENSSL_NO_TLSEXT
            if (ctx2 && !SSL_CTX_set_cipher_list(ctx2,cipher))
                  {
                  BIO_printf(bio_err,"error setting cipher list\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);

#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
      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");
      if (www)
            do_server(port,socket_type,&accept_socket,www_body, context);
      else
            do_server(port,socket_type,&accept_socket,sv_body, context);
      print_stats(bio_s_out,ctx);
      ret=0;
end:
      if (ctx != NULL) SSL_CTX_free(ctx);
      if (s_cert)
            X509_free(s_cert);
      if (s_dcert)
            X509_free(s_dcert);
      if (s_key)
            EVP_PKEY_free(s_key);
      if (s_dkey)
            EVP_PKEY_free(s_dkey);
      if (pass)
            OPENSSL_free(pass);
      if (dpass)
            OPENSSL_free(dpass);
#ifndef OPENSSL_NO_TLSEXT
      if (ctx2 != NULL) SSL_CTX_free(ctx2);
      if (s_cert2)
            X509_free(s_cert2);
      if (s_key2)
            EVP_PKEY_free(s_key2);
#endif
      if (bio_s_out != NULL)
            {
        BIO_free(bio_s_out);
            bio_s_out=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, unsigned char *context)
      {
      char *buf=NULL;
      fd_set readfds;
      int ret=1,width;
      int k,i;
      unsigned long l;
      SSL *con=NULL;
      BIO *sbio;
#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_NETWARE)
      struct timeval tv;
#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 ((con->kssl_ctx = kssl_ctx_new()) != NULL)
                        {
                        kssl_ctx_setstring(con->kssl_ctx, KSSL_SERVICE,
                                                KRB5SVC);
                        kssl_ctx_setstring(con->kssl_ctx, KSSL_KEYTAB,
                                                KRB5KEYTAB);
                        }
#endif      /* OPENSSL_NO_KRB5 */
            if(context)
                  SSL_set_session_id_context(con, context,
                                     strlen((char *)context));
      }
      SSL_clear(con);

      if (SSL_version(con) == DTLS1_VERSION)
            {
            struct timeval timeout;

            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 ( mtu > 0)
                  {
                  SSL_set_options(con, SSL_OP_NO_QUERY_MTU);
                  SSL_set_mtu(con, mtu);
                  }
            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)
            {
            con->debug=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)
            {
            SSL_set_msg_callback(con, msg_cb);
            SSL_set_msg_callback_arg(con, 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)
                  FD_SET(fileno(stdin),&readfds);
#endif
                  FD_SET(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;
#else
                  i=select(width,(void *)&readfds,NULL,NULL,NULL);
                  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=read(fileno(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=read(fileno(stdin),buf,bufsize);
                  if (!s_quiet)
                        {
                        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;
                              }
                        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);
                        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);
                        switch (SSL_get_error(con,i))
                              {
                        case SSL_ERROR_NONE:
#ifdef CHARSET_EBCDIC
                              ascii2ebcdic(buf,buf,i);
#endif
                              write(fileno(stdout),buf,
                                    (unsigned int)i);
                              if (SSL_pending(con)) goto again;
                              break;
                        case SSL_ERROR_WANT_WRITE:
                        case SSL_ERROR_WANT_READ:
                        case SSL_ERROR_WANT_X509_LOOKUP:
                              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:
      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
      if (con != NULL) 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];

      if ((i=SSL_accept(con)) <= 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));
                  }
            else
                  ERR_print_errors(bio_err);
            return(0);
            }

      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));
      BIO_printf(bio_s_out,"CIPHER is %s\n",(str != NULL)?str:"(NONE)");
      if (con->hit) 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
      if (con->kssl_ctx->client_princ != NULL)
            {
            BIO_printf(bio_s_out,"Kerberos peer principal is %s\n",
                  con->kssl_ctx->client_princ);
            }
#endif /* OPENSSL_NO_KRB5 */
      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, unsigned char *context)
      {
      char *buf=NULL;
      int ret=1;
      int i,j,k,blank,dot;
      struct stat st_buf;
      SSL *con;
      SSL_CIPHER *c;
      BIO *io,*ssl_bio,*sbio;
      long total_bytes;

      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 ((con->kssl_ctx = kssl_ctx_new()) != NULL)
            {
            kssl_ctx_setstring(con->kssl_ctx, KSSL_SERVICE, KRB5SVC);
            kssl_ctx_setstring(con->kssl_ctx, 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)
            {
            con->debug=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)
            {
            SSL_set_msg_callback(con, msg_cb);
            SSL_set_msg_callback_arg(con, bio_s_out);
            }

      blank=0;
      for (;;)
            {
            if (hack)
                  {
                  i=SSL_accept(con);

                  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) && !defined(__DJGPP__)
                        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="                          ";

                  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");

                  /* 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");
                        }
                  BIO_printf(io,((con->hit)
                        ?"---\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 (stat(p,&st_buf) < 0)
                        {
                        BIO_puts(io,text);
                        BIO_printf(io,"Error accessing '%s'\r\n",p);
                        ERR_print_errors(io);
                        break;
                        }
                  if (S_ISDIR(st_buf.st_mode))
                        {
#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 */
                  total_bytes=0;
                  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);
      }

#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;
      }

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