text: /*
   * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   * Copyright 2005 Nokia. All rights reserved.
   *
   * Licensed under the Apache License 2.0 (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include <ctype.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #if defined(_WIN32)
  /* Included before async.h to avoid some warnings */
  # include <windows.h>
  #endif
  
  #include <openssl/e_os2.h>
  #include <openssl/async.h>
  #include <openssl/ssl.h>
  
  #ifndef OPENSSL_NO_SOCK
  
  /*
   * 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/bn.h>
  #include "apps.h"
  #include "progs.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"
  #ifdef CHARSET_EBCDIC
  #include <openssl/ebcdic.h>
  #endif
  #include "internal/sockets.h"
  
  static int not_resumable_sess_cb(SSL *s, int is_forward_secure);
  static int sv_body(int s, int stype, int prot, unsigned char *context);
  static int www_body(int s, int stype, int prot, unsigned char *context);
  static int rev_body(int s, int stype, int prot, unsigned char *context);
  static void close_accept_socket(void);
  static int init_ssl_connection(SSL *s);
  static void print_stats(BIO *bp, SSL_CTX *ctx);
  static int generate_session_id(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
  static void print_connection_info(SSL *con);
  
  static const int bufsize = 16 * 1024;
  static int accept_socket = -1;
  
  #define TEST_CERT       "server.pem"
  #define TEST_CERT2      "server2.pem"
  
  static int s_nbio = 0;
  static int s_nbio_test = 0;
  static int s_crlf = 0;
  static SSL_CTX *ctx = NULL;
  static SSL_CTX *ctx2 = NULL;
  static int www = 0;
  
  static BIO *bio_s_out = NULL;
  static BIO *bio_s_msg = NULL;
  static int s_debug = 0;
  static int s_tlsextdebug = 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 async = 0;
  
  static int use_sendfile = 0;
  
  static const char *session_id_prefix = NULL;
  
  #ifndef OPENSSL_NO_DTLS
  static int enable_timeouts = 0;
  static long socket_mtu;
  #endif
  
  /*
   * We define this but make it always be 0 in no-dtls builds to simplify the
   * code.
   */
  static int dtlslisten = 0;
  static int stateless = 0;
  
  static int early_data = 0;
  static SSL_SESSION *psksess = NULL;
  
  static char *psk_identity = "Client_identity";
  char *psk_key = NULL;           /* by default PSK is not used */
  
  static char http_server_binmode = 0; /* for now: 0/1 = default/binary */
  
  #ifndef OPENSSL_NO_PSK
  static unsigned int psk_server_cb(SSL *ssl, const char *identity,
                                    unsigned char *psk,
                                    unsigned int max_psk_len)
  {
      long key_len = 0;
      unsigned char *key;
  
      if (s_debug)
          BIO_printf(bio_s_out, "psk_server_cb\n");
      if (identity == NULL) {
          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",
                     (int)strlen(identity), 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 warning: client identity not what we expected"
                     " (got '%s' expected '%s')\n", identity, psk_identity);
      } else {
        if (s_debug)
          BIO_printf(bio_s_out, "PSK client identity found\n");
      }
  
      /* convert the PSK key to binary */
      key = OPENSSL_hexstr2buf(psk_key, &key_len);
      if (key == NULL) {
          BIO_printf(bio_err, "Could not convert PSK key '%s' to buffer\n",
                     psk_key);
          return 0;
      }
      if (key_len > (int)max_psk_len) {
          BIO_printf(bio_err,
                     "psk buffer of callback is too small (%d) for key (%ld)\n",
                     max_psk_len, key_len);
          OPENSSL_free(key);
          return 0;
      }
  
      memcpy(psk, key, key_len);
      OPENSSL_free(key);
  
      if (s_debug)
          BIO_printf(bio_s_out, "fetched PSK len=%ld\n", key_len);
      return key_len;
   out_err:
      if (s_debug)
          BIO_printf(bio_err, "Error in PSK server callback\n");
      (void)BIO_flush(bio_err);
      (void)BIO_flush(bio_s_out);
      return 0;
  }
  #endif
  
  static int psk_find_session_cb(SSL *ssl, const unsigned char *identity,
                                 size_t identity_len, SSL_SESSION **sess)
  {
      SSL_SESSION *tmpsess = NULL;
      unsigned char *key;
      long key_len;
      const SSL_CIPHER *cipher = NULL;
  
      if (strlen(psk_identity) != identity_len
              || memcmp(psk_identity, identity, identity_len) != 0) {
          *sess = NULL;
          return 1;
      }
  
      if (psksess != NULL) {
          SSL_SESSION_up_ref(psksess);
          *sess = psksess;
          return 1;
      }
  
      key = OPENSSL_hexstr2buf(psk_key, &key_len);
      if (key == NULL) {
          BIO_printf(bio_err, "Could not convert PSK key '%s' to buffer\n",
                     psk_key);
          return 0;
      }
  
      /* We default to SHA256 */
      cipher = SSL_CIPHER_find(ssl, tls13_aes128gcmsha256_id);
      if (cipher == NULL) {
          BIO_printf(bio_err, "Error finding suitable ciphersuite\n");
          OPENSSL_free(key);
          return 0;
      }
  
      tmpsess = SSL_SESSION_new();
      if (tmpsess == NULL
              || !SSL_SESSION_set1_master_key(tmpsess, key, key_len)
              || !SSL_SESSION_set_cipher(tmpsess, cipher)
              || !SSL_SESSION_set_protocol_version(tmpsess, SSL_version(ssl))) {
          OPENSSL_free(key);
          return 0;
      }
      OPENSSL_free(key);
      *sess = tmpsess;
  
      return 1;
  }
  
  #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;
  static srpsrvparm srp_callback_parm;
  
  /*
   * 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 ssl_srp_server_param_cb(SSL *s, int *ad, void *arg)
  {
      srpsrvparm *p = (srpsrvparm *) arg;
      int ret = SSL3_AL_FATAL;
  
      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);
          goto err;
      }
  
      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;
          goto err;
      }
      BIO_printf(bio_err,
                 "SRP parameters set: username = \"%s\" info=\"%s\" \n",
                 p->login, p->user->info);
      ret = SSL_ERROR_NONE;
  
   err:
      SRP_user_pwd_free(p->user);
      p->user = NULL;
      p->login = NULL;
      return ret;
  }
  
  #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 = NULL;
  
  /* This struct is "unwarranted chumminess with the compiler." */
  typedef struct {
      size_t alloced;
      char buff[1];
  } EBCDIC_OUTBUFF;
  
  static const BIO_METHOD *BIO_f_ebcdic_filter()
  {
      if (methods_ebcdic == NULL) {
          methods_ebcdic = BIO_meth_new(BIO_TYPE_EBCDIC_FILTER,
                                        "EBCDIC/ASCII filter");
          if (methods_ebcdic == NULL
              || !BIO_meth_set_write(methods_ebcdic, ebcdic_write)
              || !BIO_meth_set_read(methods_ebcdic, ebcdic_read)
              || !BIO_meth_set_puts(methods_ebcdic, ebcdic_puts)
              || !BIO_meth_set_gets(methods_ebcdic, ebcdic_gets)
              || !BIO_meth_set_ctrl(methods_ebcdic, ebcdic_ctrl)
              || !BIO_meth_set_create(methods_ebcdic, ebcdic_new)
              || !BIO_meth_set_destroy(methods_ebcdic, ebcdic_free))
              return NULL;
      }
      return methods_ebcdic;
  }
  
  static int ebcdic_new(BIO *bi)
  {
      EBCDIC_OUTBUFF *wbuf;
  
      wbuf = app_malloc(sizeof(*wbuf) + 1024, "ebcdic wbuf");
      wbuf->alloced = 1024;
      wbuf->buff[0] = '\0';
  
      BIO_set_data(bi, wbuf);
      BIO_set_init(bi, 1);
      return 1;
  }
  
  static int ebcdic_free(BIO *a)
  {
      EBCDIC_OUTBUFF *wbuf;
  
      if (a == NULL)
          return 0;
      wbuf = BIO_get_data(a);
      OPENSSL_free(wbuf);
      BIO_set_data(a, NULL);
      BIO_set_init(a, 0);
  
      return 1;
  }
  
  static int ebcdic_read(BIO *b, char *out, int outl)
  {
      int ret = 0;
      BIO *next = BIO_next(b);
  
      if (out == NULL || outl == 0)
          return 0;
      if (next == NULL)
          return 0;
  
      ret = BIO_read(next, 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;
      BIO *next = BIO_next(b);
      int ret = 0;
      int num;
  
      if ((in == NULL) || (inl <= 0))
          return 0;
      if (next == NULL)
          return 0;
  
      wbuf = (EBCDIC_OUTBUFF *) BIO_get_data(b);
  
      if (inl > (num = wbuf->alloced)) {
          num = num + num;        /* double the size */
          if (num < inl)
              num = inl;
          OPENSSL_free(wbuf);
          wbuf = app_malloc(sizeof(*wbuf) + num, "grow ebcdic wbuf");
  
          wbuf->alloced = num;
          wbuf->buff[0] = '\0';
  
          BIO_set_data(b, wbuf);
      }
  
      ebcdic2ascii(wbuf->buff, in, inl);
  
      ret = BIO_write(next, wbuf->buff, inl);
  
      return ret;
  }
  
  static long ebcdic_ctrl(BIO *b, int cmd, long num, void *ptr)
  {
      long ret;
      BIO *next = BIO_next(b);
  
      if (next == NULL)
          return 0;
      switch (cmd) {
      case BIO_CTRL_DUP:
          ret = 0L;
          break;
      default:
          ret = BIO_ctrl(next, cmd, num, ptr);
          break;
      }
      return ret;
  }
  
  static int ebcdic_gets(BIO *bp, char *buf, int size)
  {
      int i, ret = 0;
      BIO *next = BIO_next(bp);
  
      if (next == 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 (BIO_next(bp) == NULL)
          return 0;
      return ebcdic_write(bp, str, strlen(str));
  }
  #endif
  
  /* This is a context that we pass to callbacks */
  typedef struct tlsextctx_st {
      char *servername;
      BIO *biodebug;
      int extension_error;
  } tlsextctx;
  
  static int 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 != NULL && p->biodebug != NULL) {
          const char *cp = servername;
          unsigned char uc;
  
          BIO_printf(p->biodebug, "Hostname in TLS extension: \"");
          while ((uc = *cp++) != 0)
              BIO_printf(p->biodebug,
                         (((uc) & ~127) == 0) && isprint(uc) ? "%c" : "\\x%02x", uc);
          BIO_printf(p->biodebug, "\"\n");
      }
  
      if (p->servername == NULL)
          return SSL_TLSEXT_ERR_NOACK;
  
      if (servername != NULL) {
          if (strcasecmp(servername, p->servername))
              return p->extension_error;
          if (ctx2 != NULL) {
              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 {
      int timeout;
      /* File to load OCSP Response from (or NULL if no file) */
      char *respin;
      /* Default responder to use */
      char *host, *path, *port;
      int use_ssl;
      int verbose;
  } tlsextstatusctx;
  
  static tlsextstatusctx tlscstatp = { -1 };
  
  #ifndef OPENSSL_NO_OCSP
  
  /*
   * Helper function to get an OCSP_RESPONSE from a responder. 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 get_ocsp_resp_from_responder(SSL *s, tlsextstatusctx *srctx,
                                          OCSP_RESPONSE **resp)
  {
      char *host = NULL, *port = NULL, *path = NULL;
      int use_ssl;
      STACK_OF(OPENSSL_STRING) *aia = NULL;
      X509 *x = NULL;
      X509_STORE_CTX *inctx = NULL;
      X509_OBJECT *obj;
      OCSP_REQUEST *req = NULL;
      OCSP_CERTID *id = NULL;
      STACK_OF(X509_EXTENSION) *exts;
      int ret = SSL_TLSEXT_ERR_NOACK;
      int i;
  
      /* Build up OCSP query from server certificate */
      x = SSL_get_certificate(s);
      aia = X509_get1_ocsp(x);
      if (aia != NULL) {
          if (!OSSL_HTTP_parse_url(sk_OPENSSL_STRING_value(aia, 0),
                                   &host, &port, NULL, &path, &use_ssl)) {
              BIO_puts(bio_err, "cert_status: can't parse AIA URL\n");
              goto err;
          }
          if (srctx->verbose)
              BIO_printf(bio_err, "cert_status: AIA URL: %s\n",
                         sk_OPENSSL_STRING_value(aia, 0));
      } else {
          if (srctx->host == NULL) {
              BIO_puts(bio_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;
      }
  
      inctx = X509_STORE_CTX_new();
      if (inctx == NULL)
          goto err;
      if (!X509_STORE_CTX_init(inctx,
                               SSL_CTX_get_cert_store(SSL_get_SSL_CTX(s)),
                               NULL, NULL))
          goto err;
      obj = X509_STORE_CTX_get_obj_by_subject(inctx, X509_LU_X509,
                                              X509_get_issuer_name(x));
      if (obj == NULL) {
          BIO_puts(bio_err, "cert_status: Can't retrieve issuer certificate.\n");
          goto done;
      }
      id = OCSP_cert_to_id(NULL, x, X509_OBJECT_get0_X509(obj));
      X509_OBJECT_free(obj);
      if (id == NULL)
          goto err;
      req = OCSP_REQUEST_new();
      if (req == NULL)
          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(req, host, path, port, use_ssl, NULL,
                               srctx->timeout);
      if (*resp == NULL) {
          BIO_puts(bio_err, "cert_status: error querying responder\n");
          goto done;
      }
  
      ret = SSL_TLSEXT_ERR_OK;
      goto done;
  
   err:
      ret = SSL_TLSEXT_ERR_ALERT_FATAL;
   done:
      /*
       * If we parsed aia we need to free; otherwise they were copied and we
       * don't
       */
      if (aia != NULL) {
          OPENSSL_free(host);
          OPENSSL_free(path);
          OPENSSL_free(port);
          X509_email_free(aia);
      }
      OCSP_CERTID_free(id);
      OCSP_REQUEST_free(req);
      X509_STORE_CTX_free(inctx);
      return ret;
  }
  
  /*
   * Certificate Status callback. This is called when a client includes a
   * certificate status request extension. The response is either obtained from a
   * file, or from an OCSP responder.
   */
  static int cert_status_cb(SSL *s, void *arg)
  {
      tlsextstatusctx *srctx = arg;
      OCSP_RESPONSE *resp = NULL;
      unsigned char *rspder = NULL;
      int rspderlen;
      int ret = SSL_TLSEXT_ERR_ALERT_FATAL;
  
      if (srctx->verbose)
          BIO_puts(bio_err, "cert_status: callback called\n");
  
      if (srctx->respin != NULL) {
          BIO *derbio = bio_open_default(srctx->respin, 'r', FORMAT_ASN1);
          if (derbio == NULL) {
              BIO_puts(bio_err, "cert_status: Cannot open OCSP response file\n");
              goto err;
          }
          resp = d2i_OCSP_RESPONSE_bio(derbio, NULL);
          BIO_free(derbio);
          if (resp == NULL) {
              BIO_puts(bio_err, "cert_status: Error reading OCSP response\n");
              goto err;
          }
      } else {
          ret = get_ocsp_resp_from_responder(s, srctx, &resp);
          if (ret != SSL_TLSEXT_ERR_OK)
              goto err;
      }
  
      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(bio_err, "cert_status: ocsp response sent:\n");
          OCSP_RESPONSE_print(bio_err, resp, 2);
      }
  
      ret = SSL_TLSEXT_ERR_OK;
  
   err:
      if (ret != SSL_TLSEXT_ERR_OK)
          ERR_print_errors(bio_err);
  
      OCSP_RESPONSE_free(resp);
  
      return ret;
  }
  #endif
  
  #ifndef OPENSSL_NO_NEXTPROTONEG
  /* This is the context that we pass to next_proto_cb */
  typedef struct tlsextnextprotoctx_st {
      unsigned char *data;
      size_t 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;
      size_t 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 int 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_ALERT_FATAL;
      }
  
      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;
  }
  
  static int not_resumable_sess_cb(SSL *s, int is_forward_secure)
  {
      /* disable resumption for sessions with forward secure ciphers */
      return is_forward_secure;
  }
  
  typedef enum OPTION_choice {
      OPT_ERR = -1, OPT_EOF = 0, OPT_HELP, OPT_ENGINE,
      OPT_4, OPT_6, OPT_ACCEPT, OPT_PORT, OPT_UNIX, OPT_UNLINK, OPT_NACCEPT,
      OPT_VERIFY, OPT_NAMEOPT, OPT_UPPER_V_VERIFY, OPT_CONTEXT, OPT_CERT, OPT_CRL,
      OPT_CRL_DOWNLOAD, OPT_SERVERINFO, OPT_CERTFORM, OPT_KEY, OPT_KEYFORM,
      OPT_PASS, OPT_CERT_CHAIN, OPT_DHPARAM, OPT_DCERTFORM, OPT_DCERT,
      OPT_DKEYFORM, OPT_DPASS, OPT_DKEY, OPT_DCERT_CHAIN, OPT_NOCERT,
      OPT_CAPATH, OPT_NOCAPATH, OPT_CHAINCAPATH, OPT_VERIFYCAPATH, OPT_NO_CACHE,
      OPT_EXT_CACHE, OPT_CRLFORM, OPT_VERIFY_RET_ERROR, OPT_VERIFY_QUIET,
      OPT_BUILD_CHAIN, OPT_CAFILE, OPT_NOCAFILE, OPT_CHAINCAFILE,
      OPT_VERIFYCAFILE,
      OPT_CASTORE, OPT_NOCASTORE, OPT_CHAINCASTORE, OPT_VERIFYCASTORE,
      OPT_NBIO, OPT_NBIO_TEST, OPT_IGN_EOF, OPT_NO_IGN_EOF,
      OPT_DEBUG, OPT_TLSEXTDEBUG, OPT_STATUS, OPT_STATUS_VERBOSE,
      OPT_STATUS_TIMEOUT, OPT_STATUS_URL, OPT_STATUS_FILE, OPT_MSG, OPT_MSGFILE,
      OPT_TRACE, OPT_SECURITY_DEBUG, OPT_SECURITY_DEBUG_VERBOSE, OPT_STATE,
      OPT_CRLF, OPT_QUIET, OPT_BRIEF, OPT_NO_DHE,
      OPT_NO_RESUME_EPHEMERAL, OPT_PSK_IDENTITY, OPT_PSK_HINT, OPT_PSK,
      OPT_PSK_SESS, OPT_SRPVFILE, OPT_SRPUSERSEED, OPT_REV, OPT_WWW,
      OPT_UPPER_WWW, OPT_HTTP, OPT_ASYNC, OPT_SSL_CONFIG,
      OPT_MAX_SEND_FRAG, OPT_SPLIT_SEND_FRAG, OPT_MAX_PIPELINES, OPT_READ_BUF,
      OPT_SSL3, OPT_TLS1_3, OPT_TLS1_2, OPT_TLS1_1, OPT_TLS1, OPT_DTLS, OPT_DTLS1,
      OPT_DTLS1_2, OPT_SCTP, OPT_TIMEOUT, OPT_MTU, OPT_LISTEN, OPT_STATELESS,
      OPT_ID_PREFIX, OPT_SERVERNAME, OPT_SERVERNAME_FATAL,
      OPT_CERT2, OPT_KEY2, OPT_NEXTPROTONEG, OPT_ALPN, OPT_SENDFILE,
      OPT_SRTP_PROFILES, OPT_KEYMATEXPORT, OPT_KEYMATEXPORTLEN,
      OPT_KEYLOG_FILE, OPT_MAX_EARLY, OPT_RECV_MAX_EARLY, OPT_EARLY_DATA,
      OPT_S_NUM_TICKETS, OPT_ANTI_REPLAY, OPT_NO_ANTI_REPLAY, OPT_SCTP_LABEL_BUG,
      OPT_HTTP_SERVER_BINMODE, OPT_NOCANAMES, OPT_IGNORE_UNEXPECTED_EOF,
      OPT_R_ENUM,
      OPT_S_ENUM,
      OPT_V_ENUM,
      OPT_X_ENUM,
      OPT_PROV_ENUM
  } OPTION_CHOICE;
  
  const OPTIONS s_server_options[] = {
      OPT_SECTION("General"),
      {"help", OPT_HELP, '-', "Display this summary"},
      {"ssl_config", OPT_SSL_CONFIG, 's',
       "Configure SSL_CTX using the configuration 'val'"},
  #ifndef OPENSSL_NO_SSL_TRACE
      {"trace", OPT_TRACE, '-', "trace protocol messages"},
  #endif
  #ifndef OPENSSL_NO_ENGINE
      {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  #endif
  
      OPT_SECTION("Network"),
      {"port", OPT_PORT, 'p',
       "TCP/IP port to listen on for connections (default is " PORT ")"},
      {"accept", OPT_ACCEPT, 's',
       "TCP/IP optional host and port to listen on for connections (default is *:" PORT ")"},
  #ifdef AF_UNIX
      {"unix", OPT_UNIX, 's', "Unix domain socket to accept on"},
      {"unlink", OPT_UNLINK, '-', "For -unix, unlink existing socket first"},
  #endif
      {"4", OPT_4, '-', "Use IPv4 only"},
      {"6", OPT_6, '-', "Use IPv6 only"},
  
      OPT_SECTION("Identity"),
      {"context", OPT_CONTEXT, 's', "Set session ID context"},
      {"CAfile", OPT_CAFILE, '<', "PEM format file of CA's"},
      {"CApath", OPT_CAPATH, '/', "PEM format directory of CA's"},
      {"CAstore", OPT_CASTORE, ':', "URI to store of CA's"},
      {"no-CAfile", OPT_NOCAFILE, '-',
       "Do not load the default certificates file"},
      {"no-CApath", OPT_NOCAPATH, '-',
       "Do not load certificates from the default certificates directory"},
      {"no-CAstore", OPT_NOCASTORE, '-',
       "Do not load certificates from the default certificates store URI"},
      {"nocert", OPT_NOCERT, '-', "Don't use any certificates (Anon-DH)"},
      {"verify", OPT_VERIFY, 'n', "Turn on peer certificate verification"},
      {"Verify", OPT_UPPER_V_VERIFY, 'n',
       "Turn on peer certificate verification, must have a cert"},
      {"nameopt", OPT_NAMEOPT, 's', "Certificate subject/issuer name printing options"},
      {"cert", OPT_CERT, '<', "Server certificate file to use; default " TEST_CERT},
      {"cert2", OPT_CERT2, '<',
       "Certificate file to use for servername; default " TEST_CERT2},
      {"certform", OPT_CERTFORM, 'F',
       "Server certificate file format (PEM/DER/P12); has no effect"},
      {"cert_chain", OPT_CERT_CHAIN, '<',
       "Server certificate chain file in PEM format"},
      {"build_chain", OPT_BUILD_CHAIN, '-', "Build server certificate chain"},
      {"serverinfo", OPT_SERVERINFO, 's',
       "PEM serverinfo file for certificate"},
      {"key", OPT_KEY, 's',
       "Private key file to use; default is -cert file or else" TEST_CERT},
      {"key2", OPT_KEY2, '<',
       "-Private Key file to use for servername if not in -cert2"},
      {"keyform", OPT_KEYFORM, 'f', "Key format (ENGINE, other values ignored)"},
      {"pass", OPT_PASS, 's', "Private key and cert file pass phrase source"},
      {"dcert", OPT_DCERT, '<',
       "Second server certificate file to use (usually for DSA)"},
      {"dcertform", OPT_DCERTFORM, 'F',
       "Second server certificate file format (PEM/DER/P12); has no effect"},
      {"dcert_chain", OPT_DCERT_CHAIN, '<',
       "second server certificate chain file in PEM format"},
      {"dkey", OPT_DKEY, '<',
       "Second private key file to use (usually for DSA)"},
      {"dkeyform", OPT_DKEYFORM, 'F',
       "Second key file format (ENGINE, other values ignored)"},
      {"dpass", OPT_DPASS, 's', "Second private key and cert file pass phrase source"},
      {"dhparam", OPT_DHPARAM, '<', "DH parameters file to use"},
      {"servername", OPT_SERVERNAME, 's',
       "Servername for HostName TLS extension"},
      {"servername_fatal", OPT_SERVERNAME_FATAL, '-',
       "mismatch send fatal alert (default warning alert)"},
      {"nbio_test", OPT_NBIO_TEST, '-', "Test with the non-blocking test bio"},
      {"crlf", OPT_CRLF, '-', "Convert LF from terminal into CRLF"},
      {"quiet", OPT_QUIET, '-', "No server output"},
      {"no_resume_ephemeral", OPT_NO_RESUME_EPHEMERAL, '-',
       "Disable caching and tickets if ephemeral (EC)DH is used"},
      {"www", OPT_WWW, '-', "Respond to a 'GET /' with a status page"},
      {"WWW", OPT_UPPER_WWW, '-', "Respond to a 'GET with the file ./path"},
      {"ignore_unexpected_eof", OPT_IGNORE_UNEXPECTED_EOF, '-',
       "Do not treat lack of close_notify from a peer as an error"},
      {"tlsextdebug", OPT_TLSEXTDEBUG, '-',
       "Hex dump of all TLS extensions received"},
      {"HTTP", OPT_HTTP, '-', "Like -WWW but ./path includes HTTP headers"},
      {"id_prefix", OPT_ID_PREFIX, 's',
       "Generate SSL/TLS session IDs prefixed by arg"},
      {"keymatexport", OPT_KEYMATEXPORT, 's',
       "Export keying material using label"},
      {"keymatexportlen", OPT_KEYMATEXPORTLEN, 'p',
       "Export len bytes of keying material; default 20"},
      {"CRL", OPT_CRL, '<', "CRL file to use"},
      {"CRLform", OPT_CRLFORM, 'F', "CRL file format (PEM or DER); default PEM"},
      {"crl_download", OPT_CRL_DOWNLOAD, '-',
       "Download CRLs from distribution points in certificate CDP entries"},
      {"chainCAfile", OPT_CHAINCAFILE, '<',
       "CA file for certificate chain (PEM format)"},
      {"chainCApath", OPT_CHAINCAPATH, '/',
       "use dir as certificate store path to build CA certificate chain"},
      {"chainCAstore", OPT_CHAINCASTORE, ':',
       "use URI as certificate store to build CA certificate chain"},
      {"verifyCAfile", OPT_VERIFYCAFILE, '<',
       "CA file for certificate verification (PEM format)"},
      {"verifyCApath", OPT_VERIFYCAPATH, '/',
       "use dir as certificate store path to verify CA certificate"},
      {"verifyCAstore", OPT_VERIFYCASTORE, ':',
       "use URI as certificate store to verify CA certificate"},
      {"no_cache", OPT_NO_CACHE, '-', "Disable session cache"},
      {"ext_cache", OPT_EXT_CACHE, '-',
       "Disable internal cache, setup and use external cache"},
      {"verify_return_error", OPT_VERIFY_RET_ERROR, '-',
       "Close connection on verification error"},
      {"verify_quiet", OPT_VERIFY_QUIET, '-',
       "No verify output except verify errors"},
      {"ign_eof", OPT_IGN_EOF, '-', "ignore input eof (default when -quiet)"},
      {"no_ign_eof", OPT_NO_IGN_EOF, '-', "Do not ignore input eof"},
  
  #ifndef OPENSSL_NO_OCSP
      OPT_SECTION("OCSP"),
      {"status", OPT_STATUS, '-', "Request certificate status from server"},
      {"status_verbose", OPT_STATUS_VERBOSE, '-',
       "Print more output in certificate status callback"},
      {"status_timeout", OPT_STATUS_TIMEOUT, 'n',
       "Status request responder timeout"},
      {"status_url", OPT_STATUS_URL, 's', "Status request fallback URL"},
      {"status_file", OPT_STATUS_FILE, '<',
       "File containing DER encoded OCSP Response"},
  #endif
  
      OPT_SECTION("Debug"),
      {"security_debug", OPT_SECURITY_DEBUG, '-',
       "Print output from SSL/TLS security framework"},
      {"security_debug_verbose", OPT_SECURITY_DEBUG_VERBOSE, '-',
       "Print more output from SSL/TLS security framework"},
      {"brief", OPT_BRIEF, '-',
       "Restrict output to brief summary of connection parameters"},
      {"rev", OPT_REV, '-',
       "act as a simple test server which just sends back with the received text reversed"},
      {"debug", OPT_DEBUG, '-', "Print more output"},
      {"msg", OPT_MSG, '-', "Show protocol messages"},
      {"msgfile", OPT_MSGFILE, '>',
       "File to send output of -msg or -trace, instead of stdout"},
      {"state", OPT_STATE, '-', "Print the SSL states"},
      {"async", OPT_ASYNC, '-', "Operate in asynchronous mode"},
      {"max_pipelines", OPT_MAX_PIPELINES, 'p',
       "Maximum number of encrypt/decrypt pipelines to be used"},
      {"naccept", OPT_NACCEPT, 'p', "Terminate after #num connections"},
      {"keylogfile", OPT_KEYLOG_FILE, '>', "Write TLS secrets to file"},
  
      OPT_SECTION("Network"),
      {"nbio", OPT_NBIO, '-', "Use non-blocking IO"},
      {"timeout", OPT_TIMEOUT, '-', "Enable timeouts"},
      {"mtu", OPT_MTU, 'p', "Set link layer MTU"},
      {"read_buf", OPT_READ_BUF, 'p',
       "Default read buffer size to be used for connections"},
      {"split_send_frag", OPT_SPLIT_SEND_FRAG, 'p',
       "Size used to split data for encrypt pipelines"},
      {"max_send_frag", OPT_MAX_SEND_FRAG, 'p', "Maximum Size of send frames "},
  
      OPT_SECTION("Server identity"),
      {"psk_identity", OPT_PSK_IDENTITY, 's', "PSK identity to expect"},
  #ifndef OPENSSL_NO_PSK
      {"psk_hint", OPT_PSK_HINT, 's', "PSK identity hint to use"},
  #endif
      {"psk", OPT_PSK, 's', "PSK in hex (without 0x)"},
      {"psk_session", OPT_PSK_SESS, '<', "File to read PSK SSL session from"},
  #ifndef OPENSSL_NO_SRP
      {"srpvfile", OPT_SRPVFILE, '<', "The verifier file for SRP"},
      {"srpuserseed", OPT_SRPUSERSEED, 's',
       "A seed string for a default user salt"},
  #endif
  
      OPT_SECTION("Protocol and version"),
      {"max_early_data", OPT_MAX_EARLY, 'n',
       "The maximum number of bytes of early data as advertised in tickets"},
      {"recv_max_early_data", OPT_RECV_MAX_EARLY, 'n',
       "The maximum number of bytes of early data (hard limit)"},
      {"early_data", OPT_EARLY_DATA, '-', "Attempt to read early data"},
      {"num_tickets", OPT_S_NUM_TICKETS, 'n',
       "The number of TLSv1.3 session tickets that a server will automatically issue" },
      {"anti_replay", OPT_ANTI_REPLAY, '-', "Switch on anti-replay protection (default)"},
      {"no_anti_replay", OPT_NO_ANTI_REPLAY, '-', "Switch off anti-replay protection"},
      {"http_server_binmode", OPT_HTTP_SERVER_BINMODE, '-', "opening files in binary mode when acting as http server (-WWW and -HTTP)"},
      {"no_ca_names", OPT_NOCANAMES, '-',
       "Disable TLS Extension CA Names"},
      {"stateless", OPT_STATELESS, '-', "Require TLSv1.3 cookies"},
  #ifndef OPENSSL_NO_SSL3
      {"ssl3", OPT_SSL3, '-', "Just talk SSLv3"},
  #endif
  #ifndef OPENSSL_NO_TLS1
      {"tls1", OPT_TLS1, '-', "Just talk TLSv1"},
  #endif
  #ifndef OPENSSL_NO_TLS1_1
      {"tls1_1", OPT_TLS1_1, '-', "Just talk TLSv1.1"},
  #endif
  #ifndef OPENSSL_NO_TLS1_2
      {"tls1_2", OPT_TLS1_2, '-', "just talk TLSv1.2"},
  #endif
  #ifndef OPENSSL_NO_TLS1_3
      {"tls1_3", OPT_TLS1_3, '-', "just talk TLSv1.3"},
  #endif
  #ifndef OPENSSL_NO_DTLS
      {"dtls", OPT_DTLS, '-', "Use any DTLS version"},
      {"listen", OPT_LISTEN, '-',
       "Listen for a DTLS ClientHello with a cookie and then connect"},
  #endif
  #ifndef OPENSSL_NO_DTLS1
      {"dtls1", OPT_DTLS1, '-', "Just talk DTLSv1"},
  #endif
  #ifndef OPENSSL_NO_DTLS1_2
      {"dtls1_2", OPT_DTLS1_2, '-', "Just talk DTLSv1.2"},
  #endif
  #ifndef OPENSSL_NO_SCTP
      {"sctp", OPT_SCTP, '-', "Use SCTP"},
      {"sctp_label_bug", OPT_SCTP_LABEL_BUG, '-', "Enable SCTP label length bug"},
  #endif
  #ifndef OPENSSL_NO_SRTP
      {"use_srtp", OPT_SRTP_PROFILES, 's',
       "Offer SRTP key management with a colon-separated profile list"},
  #endif
  #ifndef OPENSSL_NO_DH
      {"no_dhe", OPT_NO_DHE, '-', "Disable ephemeral DH"},
  #endif
  #ifndef OPENSSL_NO_NEXTPROTONEG
      {"nextprotoneg", OPT_NEXTPROTONEG, 's',
       "Set the advertised protocols for the NPN extension (comma-separated list)"},
  #endif
      {"alpn", OPT_ALPN, 's',
       "Set the advertised protocols for the ALPN extension (comma-separated list)"},
  #ifndef OPENSSL_NO_KTLS
      {"sendfile", OPT_SENDFILE, '-', "Use sendfile to response file with -WWW"},
  #endif
  
      OPT_R_OPTIONS,
      OPT_S_OPTIONS,
      OPT_V_OPTIONS,
      OPT_X_OPTIONS,
      OPT_PROV_OPTIONS,
      {NULL}
  };
  
  #define IS_PROT_FLAG(o) \
   (o == OPT_SSL3 || o == OPT_TLS1 || o == OPT_TLS1_1 || o == OPT_TLS1_2 \
    || o == OPT_TLS1_3 || o == OPT_DTLS || o == OPT_DTLS1 || o == OPT_DTLS1_2)
  
  int s_server_main(int argc, char *argv[])
  {
      ENGINE *engine = NULL;
      EVP_PKEY *s_key = NULL, *s_dkey = NULL;
      SSL_CONF_CTX *cctx = NULL;
      const SSL_METHOD *meth = TLS_server_method();
      SSL_EXCERT *exc = NULL;
      STACK_OF(OPENSSL_STRING) *ssl_args = NULL;
      STACK_OF(X509) *s_chain = NULL, *s_dchain = NULL;
      STACK_OF(X509_CRL) *crls = NULL;
      X509 *s_cert = NULL, *s_dcert = NULL;
      X509_VERIFY_PARAM *vpm = NULL;
      const char *CApath = NULL, *CAfile = NULL, *CAstore = NULL;
      const char *chCApath = NULL, *chCAfile = NULL, *chCAstore = NULL;
      char *dpassarg = NULL, *dpass = NULL;
      char *passarg = NULL, *pass = NULL;
      char *vfyCApath = NULL, *vfyCAfile = NULL, *vfyCAstore = NULL;
      char *crl_file = NULL, *prog;
  #ifdef AF_UNIX
      int unlink_unix_path = 0;
  #endif
      do_server_cb server_cb;
      int vpmtouched = 0, build_chain = 0, no_cache = 0, ext_cache = 0;
  #ifndef OPENSSL_NO_DH
      char *dhfile = NULL;
      int no_dhe = 0;
  #endif
      int nocert = 0, ret = 1;
      int noCApath = 0, noCAfile = 0, noCAstore = 0;
      int s_cert_format = FORMAT_PEM, s_key_format = FORMAT_PEM;
      int s_dcert_format = FORMAT_PEM, s_dkey_format = FORMAT_PEM;
      int rev = 0, naccept = -1, sdebug = 0;
      int socket_family = AF_UNSPEC, socket_type = SOCK_STREAM, protocol = 0;
      int state = 0, crl_format = FORMAT_PEM, crl_download = 0;
      char *host = NULL;
      char *port = OPENSSL_strdup(PORT);
      unsigned char *context = NULL;
      OPTION_CHOICE o;
      EVP_PKEY *s_key2 = NULL;
      X509 *s_cert2 = NULL;
      tlsextctx tlsextcbp = { NULL, NULL, SSL_TLSEXT_ERR_ALERT_WARNING };
      const char *ssl_config = NULL;
      int read_buf_len = 0;
  #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 };
  #ifndef OPENSSL_NO_PSK
      /* by default do not send a PSK identity hint */
      char *psk_identity_hint = NULL;
  #endif
      char *p;
  #ifndef OPENSSL_NO_SRP
      char *srpuserseed = NULL;
      char *srp_verifier_file = NULL;
  #endif
  #ifndef OPENSSL_NO_SRTP
      char *srtp_profiles = NULL;
  #endif
      int min_version = 0, max_version = 0, prot_opt = 0, no_prot_opt = 0;
      int s_server_verify = SSL_VERIFY_NONE;
      int s_server_session_id_context = 1; /* anything will do */
      const char *s_cert_file = TEST_CERT, *s_key_file = NULL, *s_chain_file = NULL;
      const char *s_cert_file2 = TEST_CERT2, *s_key_file2 = NULL;
      char *s_dcert_file = NULL, *s_dkey_file = NULL, *s_dchain_file = NULL;
  #ifndef OPENSSL_NO_OCSP
      int s_tlsextstatus = 0;
  #endif
      int no_resume_ephemeral = 0;
      unsigned int max_send_fragment = 0;
      unsigned int split_send_fragment = 0, max_pipelines = 0;
      const char *s_serverinfo_file = NULL;
      const char *keylog_file = NULL;
      int max_early_data = -1, recv_max_early_data = -1;
      char *psksessf = NULL;
      int no_ca_names = 0;
  #ifndef OPENSSL_NO_SCTP
      int sctp_label_bug = 0;
  #endif
      int ignore_unexpected_eof = 0;
  
      /* Init of few remaining global variables */
      local_argc = argc;
      local_argv = argv;
  
      ctx = ctx2 = NULL;
      s_nbio = s_nbio_test = 0;
      www = 0;
      bio_s_out = NULL;
      s_debug = 0;
      s_msg = 0;
      s_quiet = 0;
      s_brief = 0;
      async = 0;
      use_sendfile = 0;
  
      cctx = SSL_CONF_CTX_new();
      vpm = X509_VERIFY_PARAM_new();
      if (cctx == NULL || vpm == NULL)
          goto end;
      SSL_CONF_CTX_set_flags(cctx,
                             SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CMDLINE);
  
      prog = opt_init(argc, argv, s_server_options);
      while ((o = opt_next()) != OPT_EOF) {
          if (IS_PROT_FLAG(o) && ++prot_opt > 1) {
              BIO_printf(bio_err, "Cannot supply multiple protocol flags\n");
              goto end;
          }
          if (IS_NO_PROT_FLAG(o))
              no_prot_opt++;
          if (prot_opt == 1 && no_prot_opt) {
              BIO_printf(bio_err,
                         "Cannot supply both a protocol flag and '-no_<prot>'\n");
              goto end;
          }
          switch (o) {
          case OPT_EOF:
          case OPT_ERR:
   opthelp:
              BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
              goto end;
          case OPT_HELP:
              opt_help(s_server_options);
              ret = 0;
              goto end;
  
          case OPT_4:
  #ifdef AF_UNIX
              if (socket_family == AF_UNIX) {
                  OPENSSL_free(host); host = NULL;
                  OPENSSL_free(port); port = NULL;
              }
  #endif
              socket_family = AF_INET;
              break;
          case OPT_6:
              if (1) {
  #ifdef AF_INET6
  #ifdef AF_UNIX
                  if (socket_family == AF_UNIX) {
                      OPENSSL_free(host); host = NULL;
                      OPENSSL_free(port); port = NULL;
                  }
  #endif
                  socket_family = AF_INET6;
              } else {
  #endif
                  BIO_printf(bio_err, "%s: IPv6 domain sockets unsupported\n", prog);
                  goto end;
              }
              break;
          case OPT_PORT:
  #ifdef AF_UNIX
              if (socket_family == AF_UNIX) {
                  socket_family = AF_UNSPEC;
              }
  #endif
              OPENSSL_free(port); port = NULL;
              OPENSSL_free(host); host = NULL;
              if (BIO_parse_hostserv(opt_arg(), NULL, &port, BIO_PARSE_PRIO_SERV) < 1) {
                  BIO_printf(bio_err,
                             "%s: -port argument malformed or ambiguous\n",
                             port);
                  goto end;
              }
              break;
          case OPT_ACCEPT:
  #ifdef AF_UNIX
              if (socket_family == AF_UNIX) {
                  socket_family = AF_UNSPEC;
              }
  #endif
              OPENSSL_free(port); port = NULL;
              OPENSSL_free(host); host = NULL;
              if (BIO_parse_hostserv(opt_arg(), &host, &port, BIO_PARSE_PRIO_SERV) < 1) {
                  BIO_printf(bio_err,
                             "%s: -accept argument malformed or ambiguous\n",
                             port);
                  goto end;
              }
              break;
  #ifdef AF_UNIX
          case OPT_UNIX:
              socket_family = AF_UNIX;
              OPENSSL_free(host); host = OPENSSL_strdup(opt_arg());
              OPENSSL_free(port); port = NULL;
              break;
          case OPT_UNLINK:
              unlink_unix_path = 1;
              break;
  #endif
          case OPT_NACCEPT:
              naccept = atol(opt_arg());
              break;
          case OPT_VERIFY:
              s_server_verify = SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE;
              verify_args.depth = atoi(opt_arg());
              if (!s_quiet)
                  BIO_printf(bio_err, "verify depth is %d\n", verify_args.depth);
              break;
          case OPT_UPPER_V_VERIFY:
              s_server_verify =
                  SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
                  SSL_VERIFY_CLIENT_ONCE;
              verify_args.depth = atoi(opt_arg());
              if (!s_quiet)
                  BIO_printf(bio_err,
                             "verify depth is %d, must return a certificate\n",
                             verify_args.depth);
              break;
          case OPT_CONTEXT:
              context = (unsigned char *)opt_arg();
              break;
          case OPT_CERT:
              s_cert_file = opt_arg();
              break;
          case OPT_NAMEOPT:
              if (!set_nameopt(opt_arg()))
                  goto end;
              break;
          case OPT_CRL:
              crl_file = opt_arg();
              break;
          case OPT_CRL_DOWNLOAD:
              crl_download = 1;
              break;
          case OPT_SERVERINFO:
              s_serverinfo_file = opt_arg();
              break;
          case OPT_CERTFORM:
              if (!opt_format(opt_arg(), OPT_FMT_ANY, &s_cert_format))
                  goto opthelp;
              break;
          case OPT_KEY:
              s_key_file = opt_arg();
              break;
          case OPT_KEYFORM:
              if (!opt_format(opt_arg(), OPT_FMT_ANY, &s_key_format))
                  goto opthelp;
              break;
          case OPT_PASS:
              passarg = opt_arg();
              break;
          case OPT_CERT_CHAIN:
              s_chain_file = opt_arg();
              break;
          case OPT_DHPARAM:
  #ifndef OPENSSL_NO_DH
              dhfile = opt_arg();
  #endif
              break;
          case OPT_DCERTFORM:
              if (!opt_format(opt_arg(), OPT_FMT_ANY, &s_dcert_format))
                  goto opthelp;
              break;
          case OPT_DCERT:
              s_dcert_file = opt_arg();
              break;
          case OPT_DKEYFORM:
              if (!opt_format(opt_arg(), OPT_FMT_ANY, &s_dkey_format))
                  goto opthelp;
              break;
          case OPT_DPASS:
              dpassarg = opt_arg();
              break;
          case OPT_DKEY:
              s_dkey_file = opt_arg();
              break;
          case OPT_DCERT_CHAIN:
              s_dchain_file = opt_arg();
              break;
          case OPT_NOCERT:
              nocert = 1;
              break;
          case OPT_CAPATH:
              CApath = opt_arg();
              break;
          case OPT_NOCAPATH:
              noCApath = 1;
              break;
          case OPT_CHAINCAPATH:
              chCApath = opt_arg();
              break;
          case OPT_VERIFYCAPATH:
              vfyCApath = opt_arg();
              break;
          case OPT_CASTORE:
              CAstore = opt_arg();
              break;
          case OPT_NOCASTORE:
              noCAstore = 1;
              break;
          case OPT_CHAINCASTORE:
              chCAstore = opt_arg();
              break;
          case OPT_VERIFYCASTORE:
              vfyCAstore = opt_arg();
              break;
          case OPT_NO_CACHE:
              no_cache = 1;
              break;
          case OPT_EXT_CACHE:
              ext_cache = 1;
              break;
          case OPT_CRLFORM:
              if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &crl_format))
                  goto opthelp;
              break;
          case OPT_S_CASES:
          case OPT_S_NUM_TICKETS:
          case OPT_ANTI_REPLAY:
          case OPT_NO_ANTI_REPLAY:
              if (ssl_args == NULL)
                  ssl_args = sk_OPENSSL_STRING_new_null();
              if (ssl_args == NULL
                  || !sk_OPENSSL_STRING_push(ssl_args, opt_flag())
                  || !sk_OPENSSL_STRING_push(ssl_args, opt_arg())) {
                  BIO_printf(bio_err, "%s: Memory allocation failure\n", prog);
                  goto end;
              }
              break;
          case OPT_V_CASES:
              if (!opt_verify(o, vpm))
                  goto end;
              vpmtouched++;
              break;
          case OPT_X_CASES:
              if (!args_excert(o, &exc))
                  goto end;
              break;
          case OPT_VERIFY_RET_ERROR:
              verify_args.return_error = 1;
              break;
          case OPT_VERIFY_QUIET:
              verify_args.quiet = 1;
              break;
          case OPT_BUILD_CHAIN:
              build_chain = 1;
              break;
          case OPT_CAFILE:
              CAfile = opt_arg();
              break;
          case OPT_NOCAFILE:
              noCAfile = 1;
              break;
          case OPT_CHAINCAFILE:
              chCAfile = opt_arg();
              break;
          case OPT_VERIFYCAFILE:
              vfyCAfile = opt_arg();
              break;
          case OPT_NBIO:
              s_nbio = 1;
              break;
          case OPT_NBIO_TEST:
              s_nbio = s_nbio_test = 1;
              break;
          case OPT_IGN_EOF:
              s_ign_eof = 1;
              break;
          case OPT_NO_IGN_EOF:
              s_ign_eof = 0;
              break;
          case OPT_DEBUG:
              s_debug = 1;
              break;
          case OPT_TLSEXTDEBUG:
              s_tlsextdebug = 1;
              break;
          case OPT_STATUS:
  #ifndef OPENSSL_NO_OCSP
              s_tlsextstatus = 1;
  #endif
              break;
          case OPT_STATUS_VERBOSE:
  #ifndef OPENSSL_NO_OCSP
              s_tlsextstatus = tlscstatp.verbose = 1;
  #endif
              break;
          case OPT_STATUS_TIMEOUT:
  #ifndef OPENSSL_NO_OCSP
              s_tlsextstatus = 1;
              tlscstatp.timeout = atoi(opt_arg());
  #endif
              break;
          case OPT_STATUS_URL:
  #ifndef OPENSSL_NO_OCSP
              s_tlsextstatus = 1;
              if (!OSSL_HTTP_parse_url(opt_arg(),
                                       &tlscstatp.host, &tlscstatp.port, NULL,
                                       &tlscstatp.path, &tlscstatp.use_ssl)) {
                  BIO_printf(bio_err, "Error parsing URL\n");
                  goto end;
              }
  #endif
              break;
          case OPT_STATUS_FILE:
  #ifndef OPENSSL_NO_OCSP
              s_tlsextstatus = 1;
              tlscstatp.respin = opt_arg();
  #endif
              break;
          case OPT_MSG:
              s_msg = 1;
              break;
          case OPT_MSGFILE:
              bio_s_msg = BIO_new_file(opt_arg(), "w");
              break;
          case OPT_TRACE:
  #ifndef OPENSSL_NO_SSL_TRACE
              s_msg = 2;
  #endif
              break;
          case OPT_SECURITY_DEBUG:
              sdebug = 1;
              break;
          case OPT_SECURITY_DEBUG_VERBOSE:
              sdebug = 2;
              break;
          case OPT_STATE:
              state = 1;
              break;
          case OPT_CRLF:
              s_crlf = 1;
              break;
          case OPT_QUIET:
              s_quiet = 1;
              break;
          case OPT_BRIEF:
              s_quiet = s_brief = verify_args.quiet = 1;
              break;
          case OPT_NO_DHE:
  #ifndef OPENSSL_NO_DH
              no_dhe = 1;
  #endif
              break;
          case OPT_NO_RESUME_EPHEMERAL:
              no_resume_ephemeral = 1;
              break;
          case OPT_PSK_IDENTITY:
              psk_identity = opt_arg();
              break;
          case OPT_PSK_HINT:
  #ifndef OPENSSL_NO_PSK
              psk_identity_hint = opt_arg();
  #endif
              break;
          case OPT_PSK:
              for (p = psk_key = opt_arg(); *p; p++) {
                  if (isxdigit(_UC(*p)))
                      continue;
                  BIO_printf(bio_err, "Not a hex number '%s'\n", psk_key);
                  goto end;
              }
              break;
          case OPT_PSK_SESS:
              psksessf = opt_arg();
              break;
          case OPT_SRPVFILE:
  #ifndef OPENSSL_NO_SRP
              srp_verifier_file = opt_arg();
              if (min_version < TLS1_VERSION)
                  min_version = TLS1_VERSION;
  #endif
              break;
          case OPT_SRPUSERSEED:
  #ifndef OPENSSL_NO_SRP
              srpuserseed = opt_arg();
              if (min_version < TLS1_VERSION)
                  min_version = TLS1_VERSION;
  #endif
              break;
          case OPT_REV:
              rev = 1;
              break;
          case OPT_WWW:
              www = 1;
              break;
          case OPT_UPPER_WWW:
              www = 2;
              break;
          case OPT_HTTP:
              www = 3;
              break;
          case OPT_SSL_CONFIG:
              ssl_config = opt_arg();
              break;
          case OPT_SSL3:
              min_version = SSL3_VERSION;
              max_version = SSL3_VERSION;
              break;
          case OPT_TLS1_3:
              min_version = TLS1_3_VERSION;
              max_version = TLS1_3_VERSION;
              break;
          case OPT_TLS1_2:
              min_version = TLS1_2_VERSION;
              max_version = TLS1_2_VERSION;
              break;
          case OPT_TLS1_1:
              min_version = TLS1_1_VERSION;
              max_version = TLS1_1_VERSION;
              break;
          case OPT_TLS1:
              min_version = TLS1_VERSION;
              max_version = TLS1_VERSION;
              break;
          case OPT_DTLS:
  #ifndef OPENSSL_NO_DTLS
              meth = DTLS_server_method();
              socket_type = SOCK_DGRAM;
  #endif
              break;
          case OPT_DTLS1:
  #ifndef OPENSSL_NO_DTLS
              meth = DTLS_server_method();
              min_version = DTLS1_VERSION;
              max_version = DTLS1_VERSION;
              socket_type = SOCK_DGRAM;
  #endif
              break;
          case OPT_DTLS1_2:
  #ifndef OPENSSL_NO_DTLS
              meth = DTLS_server_method();
              min_version = DTLS1_2_VERSION;
              max_version = DTLS1_2_VERSION;
              socket_type = SOCK_DGRAM;
  #endif
              break;
          case OPT_SCTP:
  #ifndef OPENSSL_NO_SCTP
              protocol = IPPROTO_SCTP;
  #endif
              break;
          case OPT_SCTP_LABEL_BUG:
  #ifndef OPENSSL_NO_SCTP
              sctp_label_bug = 1;
  #endif
              break;
          case OPT_TIMEOUT:
  #ifndef OPENSSL_NO_DTLS
              enable_timeouts = 1;
  #endif
              break;
          case OPT_MTU:
  #ifndef OPENSSL_NO_DTLS
              socket_mtu = atol(opt_arg());
  #endif
              break;
          case OPT_LISTEN:
  #ifndef OPENSSL_NO_DTLS
              dtlslisten = 1;
  #endif
              break;
          case OPT_STATELESS:
              stateless = 1;
              break;
          case OPT_ID_PREFIX:
              session_id_prefix = opt_arg();
              break;
          case OPT_ENGINE:
  #ifndef OPENSSL_NO_ENGINE
              engine = setup_engine(opt_arg(), s_debug);
  #endif
              break;
          case OPT_R_CASES:
              if (!opt_rand(o))
                  goto end;
              break;
          case OPT_PROV_CASES:
              if (!opt_provider(o))
                  goto end;
              break;
          case OPT_SERVERNAME:
              tlsextcbp.servername = opt_arg();
              break;
          case OPT_SERVERNAME_FATAL:
              tlsextcbp.extension_error = SSL_TLSEXT_ERR_ALERT_FATAL;
              break;
          case OPT_CERT2:
              s_cert_file2 = opt_arg();
              break;
          case OPT_KEY2:
              s_key_file2 = opt_arg();
              break;
          case OPT_NEXTPROTONEG:
  # ifndef OPENSSL_NO_NEXTPROTONEG
              next_proto_neg_in = opt_arg();
  #endif
              break;
          case OPT_ALPN:
              alpn_in = opt_arg();
              break;
          case OPT_SRTP_PROFILES:
  #ifndef OPENSSL_NO_SRTP
              srtp_profiles = opt_arg();
  #endif
              break;
          case OPT_KEYMATEXPORT:
              keymatexportlabel = opt_arg();
              break;
          case OPT_KEYMATEXPORTLEN:
              keymatexportlen = atoi(opt_arg());
              break;
          case OPT_ASYNC:
              async = 1;
              break;
          case OPT_MAX_SEND_FRAG:
              max_send_fragment = atoi(opt_arg());
              break;
          case OPT_SPLIT_SEND_FRAG:
              split_send_fragment = atoi(opt_arg());
              break;
          case OPT_MAX_PIPELINES:
              max_pipelines = atoi(opt_arg());
              break;
          case OPT_READ_BUF:
              read_buf_len = atoi(opt_arg());
              break;
          case OPT_KEYLOG_FILE:
              keylog_file = opt_arg();
              break;
          case OPT_MAX_EARLY:
              max_early_data = atoi(opt_arg());
              if (max_early_data < 0) {
                  BIO_printf(bio_err, "Invalid value for max_early_data\n");
                  goto end;
              }
              break;
          case OPT_RECV_MAX_EARLY:
              recv_max_early_data = atoi(opt_arg());
              if (recv_max_early_data < 0) {
                  BIO_printf(bio_err, "Invalid value for recv_max_early_data\n");
                  goto end;
              }
              break;
          case OPT_EARLY_DATA:
              early_data = 1;
              if (max_early_data == -1)
                  max_early_data = SSL3_RT_MAX_PLAIN_LENGTH;
              break;
          case OPT_HTTP_SERVER_BINMODE:
              http_server_binmode = 1;
              break;
          case OPT_NOCANAMES:
              no_ca_names = 1;
              break;
          case OPT_SENDFILE:
  #ifndef OPENSSL_NO_KTLS
              use_sendfile = 1;
  #endif
              break;
          case OPT_IGNORE_UNEXPECTED_EOF:
              ignore_unexpected_eof = 1;
              break;
          }
      }
      argc = opt_num_rest();
      argv = opt_rest();
  
  #ifndef OPENSSL_NO_NEXTPROTONEG
      if (min_version == TLS1_3_VERSION && next_proto_neg_in != NULL) {
          BIO_printf(bio_err, "Cannot supply -nextprotoneg with TLSv1.3\n");
          goto opthelp;
      }
  #endif
  #ifndef OPENSSL_NO_DTLS
      if (www && socket_type == SOCK_DGRAM) {
          BIO_printf(bio_err, "Can't use -HTTP, -www or -WWW with DTLS\n");
          goto end;
      }
  
      if (dtlslisten && socket_type != SOCK_DGRAM) {
          BIO_printf(bio_err, "Can only use -listen with DTLS\n");
          goto end;
      }
  #endif
  
      if (stateless && socket_type != SOCK_STREAM) {
          BIO_printf(bio_err, "Can only use --stateless with TLS\n");
          goto end;
      }
  
  #ifdef AF_UNIX
      if (socket_family == AF_UNIX && socket_type != SOCK_STREAM) {
          BIO_printf(bio_err,
                     "Can't use unix sockets and datagrams together\n");
          goto end;
      }
  #endif
      if (early_data && (www > 0 || rev)) {
          BIO_printf(bio_err,
                     "Can't use -early_data in combination with -www, -WWW, -HTTP, or -rev\n");
          goto end;
      }
  
  #ifndef OPENSSL_NO_SCTP
      if (protocol == IPPROTO_SCTP) {
          if (socket_type != SOCK_DGRAM) {
              BIO_printf(bio_err, "Can't use -sctp without DTLS\n");
              goto end;
          }
          /* SCTP is unusual. It uses DTLS over a SOCK_STREAM protocol */
          socket_type = SOCK_STREAM;
      }
  #endif
  
  #ifndef OPENSSL_NO_KTLS
      if (use_sendfile && www <= 1) {
          BIO_printf(bio_err, "Can't use -sendfile without -WWW or -HTTP\n");
          goto end;
      }
  #endif
  
      if (!app_passwd(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;
  
      if (s_key_file2 == NULL)
          s_key_file2 = s_cert_file2;
  
      if (!load_excert(&exc))
          goto end;
  
      if (nocert == 0) {
          s_key = load_key(s_key_file, s_key_format, 0, pass, engine,
                           "server certificate private key");
          if (s_key == NULL)
              goto end;
  
          s_cert = load_cert_pass(s_cert_file, 1, pass, "server certificate");
  
          if (s_cert == NULL)
              goto end;
          if (s_chain_file != NULL) {
              if (!load_certs(s_chain_file, &s_chain, NULL,
                              "server certificate chain"))
                  goto end;
          }
  
          if (tlsextcbp.servername != NULL) {
              s_key2 = load_key(s_key_file2, s_key_format, 0, pass, engine,
                                "second server certificate private key");
              if (s_key2 == NULL)
                  goto end;
  
              s_cert2 = load_cert_pass(s_cert_file2, 1, pass,
                                  "second server certificate");
  
              if (s_cert2 == NULL)
                  goto end;
          }
      }
  #if !defined(OPENSSL_NO_NEXTPROTONEG)
      if (next_proto_neg_in) {
          next_proto.data = next_protos_parse(&next_proto.len, next_proto_neg_in);
          if (next_proto.data == NULL)
              goto end;
      }
  #endif
      alpn_ctx.data = NULL;
      if (alpn_in) {
          alpn_ctx.data = next_protos_parse(&alpn_ctx.len, alpn_in);
          if (alpn_ctx.data == NULL)
              goto end;
      }
  
      if (crl_file != NULL) {
          X509_CRL *crl;
          crl = load_crl(crl_file, "CRL");
          if (crl == NULL)
              goto end;
          crls = sk_X509_CRL_new_null();
          if (crls == NULL || !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 != NULL) {
  
          if (s_dkey_file == NULL)
              s_dkey_file = s_dcert_file;
  
          s_dkey = load_key(s_dkey_file, s_dkey_format,
                            0, dpass, engine, "second certificate private key");
          if (s_dkey == NULL)
              goto end;
  
          s_dcert = load_cert_pass(s_dcert_file, 1, dpass,
                                   "second server certificate");
  
          if (s_dcert == NULL) {
              ERR_print_errors(bio_err);
              goto end;
          }
          if (s_dchain_file != NULL) {
              if (!load_certs(s_dchain_file, &s_dchain, NULL,
                              "second server certificate chain"))
                  goto end;
          }
  
      }
  
      if (bio_s_out == NULL) {
          if (s_quiet && !s_debug) {
              bio_s_out = BIO_new(BIO_s_null());
              if (s_msg && bio_s_msg == NULL)
                  bio_s_msg = dup_bio_out(FORMAT_TEXT);
          } else {
              if (bio_s_out == NULL)
                  bio_s_out = dup_bio_out(FORMAT_TEXT);
          }
      }
  #if !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_EC)
      if (nocert)
  #endif
      {
          s_cert_file = NULL;
          s_key_file = NULL;
          s_dcert_file = NULL;
          s_dkey_file = NULL;
          s_cert_file2 = NULL;
          s_key_file2 = NULL;
      }
  
      ctx = SSL_CTX_new(meth);
      if (ctx == NULL) {
          ERR_print_errors(bio_err);
          goto end;
      }
  
      SSL_CTX_clear_mode(ctx, SSL_MODE_AUTO_RETRY);
  
      if (sdebug)
          ssl_ctx_security_debug(ctx, sdebug);
  
      if (!config_ctx(cctx, ssl_args, ctx))
          goto end;
  
      if (ssl_config) {
          if (SSL_CTX_config(ctx, ssl_config) == 0) {
              BIO_printf(bio_err, "Error using configuration \"%s\"\n",
                         ssl_config);
              ERR_print_errors(bio_err);
              goto end;
          }
      }
  #ifndef OPENSSL_NO_SCTP
      if (protocol == IPPROTO_SCTP && sctp_label_bug == 1)
          SSL_CTX_set_mode(ctx, SSL_MODE_DTLS_SCTP_LABEL_LENGTH_BUG);
  #endif
  
      if (min_version != 0
          && SSL_CTX_set_min_proto_version(ctx, min_version) == 0)
          goto end;
      if (max_version != 0
          && SSL_CTX_set_max_proto_version(ctx, max_version) == 0)
          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");
          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);
      }
      if (exc != NULL)
          ssl_ctx_set_excert(ctx, exc);
  
      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 (async) {
          SSL_CTX_set_mode(ctx, SSL_MODE_ASYNC);
      }
  
      if (no_ca_names) {
          SSL_CTX_set_options(ctx, SSL_OP_DISABLE_TLSEXT_CA_NAMES);
      }
  
      if (ignore_unexpected_eof)
          SSL_CTX_set_options(ctx, SSL_OP_IGNORE_UNEXPECTED_EOF);
  
      if (max_send_fragment > 0
          && !SSL_CTX_set_max_send_fragment(ctx, max_send_fragment)) {
          BIO_printf(bio_err, "%s: Max send fragment size %u is out of permitted range\n",
                     prog, max_send_fragment);
          goto end;
      }
  
      if (split_send_fragment > 0
          && !SSL_CTX_set_split_send_fragment(ctx, split_send_fragment)) {
          BIO_printf(bio_err, "%s: Split send fragment size %u is out of permitted range\n",
                     prog, split_send_fragment);
          goto end;
      }
      if (max_pipelines > 0
          && !SSL_CTX_set_max_pipelines(ctx, max_pipelines)) {
          BIO_printf(bio_err, "%s: Max pipelines %u is out of permitted range\n",
                     prog, max_pipelines);
          goto end;
      }
  
      if (read_buf_len > 0) {
          SSL_CTX_set_default_read_buffer_len(ctx, read_buf_len);
      }
  #ifndef OPENSSL_NO_SRTP
      if (srtp_profiles != NULL) {
          /* Returns 0 on success! */
          if (SSL_CTX_set_tlsext_use_srtp(ctx, srtp_profiles) != 0) {
              BIO_printf(bio_err, "Error setting SRTP profile\n");
              ERR_print_errors(bio_err);
              goto end;
          }
      }
  #endif
  
      if (!ctx_set_verify_locations(ctx, CAfile, noCAfile, CApath, noCApath,
                                    CAstore, noCAstore)) {
          ERR_print_errors(bio_err);
          goto end;
      }
      if (vpmtouched && !SSL_CTX_set1_param(ctx, vpm)) {
          BIO_printf(bio_err, "Error setting verify params\n");
          ERR_print_errors(bio_err);
          goto end;
      }
  
      ssl_ctx_add_crls(ctx, crls, 0);
  
      if (!ssl_load_stores(ctx,
                           vfyCApath, vfyCAfile, vfyCAstore,
                           chCApath, chCAfile, chCAstore,
                           crls, crl_download)) {
          BIO_printf(bio_err, "Error loading store locations\n");
          ERR_print_errors(bio_err);
          goto end;
      }
  
      if (s_cert2) {
          ctx2 = SSL_CTX_new(meth);
          if (ctx2 == NULL) {
              ERR_print_errors(bio_err);
              goto end;
          }
      }
  
      if (ctx2 != NULL) {
          BIO_printf(bio_s_out, "Setting secondary ctx parameters\n");
  
          if (sdebug)
              ssl_ctx_security_debug(ctx2, 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");
              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);
          }
          if (exc != NULL)
              ssl_ctx_set_excert(ctx2, exc);
  
          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 (async)
              SSL_CTX_set_mode(ctx2, SSL_MODE_ASYNC);
  
          if (!ctx_set_verify_locations(ctx2, CAfile, noCAfile, CApath,
                                        noCApath, CAstore, noCAstore)) {
              ERR_print_errors(bio_err);
              goto end;
          }
          if (vpmtouched && !SSL_CTX_set1_param(ctx2, vpm)) {
              BIO_printf(bio_err, "Error setting verify params\n");
              ERR_print_errors(bio_err);
              goto end;
          }
  
          ssl_ctx_add_crls(ctx2, crls, 0);
          if (!config_ctx(cctx, ssl_args, ctx2))
              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);
  
  #ifndef OPENSSL_NO_DH
      if (!no_dhe) {
          DH *dh = NULL;
  
          if (dhfile != NULL)
              dh = load_dh_param(dhfile);
          else if (s_cert_file != NULL)
              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;
          }
  
          if (ctx2 != NULL) {
              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;
              }
          }
          DH_free(dh);
      }
  #endif
  
      if (!set_cert_key_stuff(ctx, s_cert, s_key, s_chain, build_chain))
          goto end;
  
      if (s_serverinfo_file != NULL
          && !SSL_CTX_use_serverinfo_file(ctx, s_serverinfo_file)) {
          ERR_print_errors(bio_err);
          goto end;
      }
  
      if (ctx2 != NULL
          && !set_cert_key_stuff(ctx2, s_cert2, s_key2, NULL, build_chain))
          goto end;
  
      if (s_dcert != NULL) {
          if (!set_cert_key_stuff(ctx, s_dcert, s_dkey, s_dchain, build_chain))
              goto end;
      }
  
      if (no_resume_ephemeral) {
          SSL_CTX_set_not_resumable_session_callback(ctx,
                                                     not_resumable_sess_cb);
  
          if (ctx2 != NULL)
              SSL_CTX_set_not_resumable_session_callback(ctx2,
                                                         not_resumable_sess_cb);
      }
  #ifndef OPENSSL_NO_PSK
      if (psk_key != NULL) {
          if (s_debug)
              BIO_printf(bio_s_out, "PSK key given, setting server callback\n");
          SSL_CTX_set_psk_server_callback(ctx, psk_server_cb);
      }
  
      if (psk_identity_hint != NULL) {
          if (min_version == TLS1_3_VERSION) {
              BIO_printf(bio_s_out, "PSK warning: there is NO identity hint in TLSv1.3\n");
          } else {
              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
      if (psksessf != NULL) {
          BIO *stmp = BIO_new_file(psksessf, "r");
  
          if (stmp == NULL) {
              BIO_printf(bio_err, "Can't open PSK session file %s\n", psksessf);
              ERR_print_errors(bio_err);
              goto end;
          }
          psksess = PEM_read_bio_SSL_SESSION(stmp, NULL, 0, NULL);
          BIO_free(stmp);
          if (psksess == NULL) {
              BIO_printf(bio_err, "Can't read PSK session file %s\n", psksessf);
              ERR_print_errors(bio_err);
              goto end;
          }
  
      }
  
      if (psk_key != NULL || psksess != NULL)
          SSL_CTX_set_psk_find_session_callback(ctx, psk_find_session_cb);
  
      SSL_CTX_set_verify(ctx, s_server_verify, verify_callback);
      if (!SSL_CTX_set_session_id_context(ctx,
                                          (void *)&s_server_session_id_context,
                                          sizeof(s_server_session_id_context))) {
          BIO_printf(bio_err, "error setting session id context\n");
          ERR_print_errors(bio_err);
          goto end;
      }
  
      /* 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);
  
      /* Set TLS1.3 cookie generation and verification callbacks */
      SSL_CTX_set_stateless_cookie_generate_cb(ctx, generate_stateless_cookie_callback);
      SSL_CTX_set_stateless_cookie_verify_cb(ctx, verify_stateless_cookie_callback);
  
      if (ctx2 != NULL) {
          SSL_CTX_set_verify(ctx2, s_server_verify, verify_callback);
          if (!SSL_CTX_set_session_id_context(ctx2,
                      (void *)&s_server_session_id_context,
                      sizeof(s_server_session_id_context))) {
              BIO_printf(bio_err, "error setting session id context\n");
              ERR_print_errors(bio_err);
              goto end;
          }
          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);
      }
  
  #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));
  
          if (ctx2)
              SSL_CTX_set_client_CA_list(ctx2, SSL_load_client_CA_file(CAfile));
      }
  #ifndef OPENSSL_NO_OCSP
      if (s_tlsextstatus) {
          SSL_CTX_set_tlsext_status_cb(ctx, cert_status_cb);
          SSL_CTX_set_tlsext_status_arg(ctx, &tlscstatp);
          if (ctx2) {
              SSL_CTX_set_tlsext_status_cb(ctx2, cert_status_cb);
              SSL_CTX_set_tlsext_status_arg(ctx2, &tlscstatp);
          }
      }
  #endif
      if (set_keylog_file(ctx, keylog_file))
          goto end;
  
      if (max_early_data >= 0)
          SSL_CTX_set_max_early_data(ctx, max_early_data);
      if (recv_max_early_data >= 0)
          SSL_CTX_set_recv_max_early_data(ctx, recv_max_early_data);
  
      if (rev)
          server_cb = rev_body;
      else if (www)
          server_cb = www_body;
      else
          server_cb = sv_body;
  #ifdef AF_UNIX
      if (socket_family == AF_UNIX
          && unlink_unix_path)
          unlink(host);
  #endif
      do_server(&accept_socket, host, port, socket_family, socket_type, protocol,
                server_cb, context, naccept, bio_s_out);
      print_stats(bio_s_out, ctx);
      ret = 0;
   end:
      SSL_CTX_free(ctx);
      SSL_SESSION_free(psksess);
      set_keylog_file(NULL, NULL);
      X509_free(s_cert);
      sk_X509_CRL_pop_free(crls, X509_CRL_free);
      X509_free(s_dcert);
      EVP_PKEY_free(s_key);
      EVP_PKEY_free(s_dkey);
      sk_X509_pop_free(s_chain, X509_free);
      sk_X509_pop_free(s_dchain, X509_free);
      OPENSSL_free(pass);
      OPENSSL_free(dpass);
      OPENSSL_free(host);
      OPENSSL_free(port);
      X509_VERIFY_PARAM_free(vpm);
      free_sessions();
      OPENSSL_free(tlscstatp.host);
      OPENSSL_free(tlscstatp.port);
      OPENSSL_free(tlscstatp.path);
      SSL_CTX_free(ctx2);
      X509_free(s_cert2);
      EVP_PKEY_free(s_key2);
  #ifndef OPENSSL_NO_NEXTPROTONEG
      OPENSSL_free(next_proto.data);
  #endif
      OPENSSL_free(alpn_ctx.data);
      ssl_excert_free(exc);
      sk_OPENSSL_STRING_free(ssl_args);
      SSL_CONF_CTX_free(cctx);
      release_engine(engine);
      BIO_free(bio_s_out);
      bio_s_out = NULL;
      BIO_free(bio_s_msg);
      bio_s_msg = NULL;
  #ifdef CHARSET_EBCDIC
      BIO_meth_free(methods_ebcdic);
  #endif
      return 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(int s, int stype, int prot, unsigned char *context)
  {
      char *buf = NULL;
      fd_set readfds;
      int ret = 1, width;
      int k, i;
      unsigned long l;
      SSL *con = NULL;
      BIO *sbio;
      struct timeval timeout;
  #if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_MSDOS))
      struct timeval *timeoutp;
  #endif
  #ifndef OPENSSL_NO_DTLS
  # ifndef OPENSSL_NO_SCTP
      int isdtls = (stype == SOCK_DGRAM || prot == IPPROTO_SCTP);
  # else
      int isdtls = (stype == SOCK_DGRAM);
  # endif
  #endif
  
      buf = app_malloc(bufsize, "server buffer");
      if (s_nbio) {
          if (!BIO_socket_nbio(s, 1))
              ERR_print_errors(bio_err);
          else if (!s_quiet)
              BIO_printf(bio_err, "Turned on non blocking io\n");
      }
  
      con = SSL_new(ctx);
      if (con == NULL) {
          ret = -1;
          goto err;
      }
  
      if (s_tlsextdebug) {
          SSL_set_tlsext_debug_callback(con, tlsext_cb);
          SSL_set_tlsext_debug_arg(con, bio_s_out);
      }
  
      if (context != NULL
          && !SSL_set_session_id_context(con, context,
                                         strlen((char *)context))) {
          BIO_printf(bio_err, "Error setting session id context\n");
          ret = -1;
          goto err;
      }
  
      if (!SSL_clear(con)) {
          BIO_printf(bio_err, "Error clearing SSL connection\n");
          ret = -1;
          goto err;
      }
  #ifndef OPENSSL_NO_DTLS
      if (isdtls) {
  # ifndef OPENSSL_NO_SCTP
          if (prot == IPPROTO_SCTP)
              sbio = BIO_new_dgram_sctp(s, BIO_NOCLOSE);
          else
  # endif
              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);
  
  # ifndef OPENSSL_NO_SCTP
          if (prot != IPPROTO_SCTP)
  # endif
              /* Turn on cookie exchange. Not necessary for SCTP */
              SSL_set_options(con, SSL_OP_COOKIE_EXCHANGE);
      } else
  #endif
          sbio = BIO_new_socket(s, BIO_NOCLOSE);
  
      if (sbio == NULL) {
          BIO_printf(bio_err, "Unable to create BIO\n");
          ERR_print_errors(bio_err);
          goto err;
      }
  
      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); */
  
      if (s_debug) {
          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);
      }
  
      if (s_tlsextdebug) {
          SSL_set_tlsext_debug_callback(con, tlsext_cb);
          SSL_set_tlsext_debug_arg(con, bio_s_out);
      }
  
      if (early_data) {
          int write_header = 1, edret = SSL_READ_EARLY_DATA_ERROR;
          size_t readbytes;
  
          while (edret != SSL_READ_EARLY_DATA_FINISH) {
              for (;;) {
                  edret = SSL_read_early_data(con, buf, bufsize, &readbytes);
                  if (edret != SSL_READ_EARLY_DATA_ERROR)
                      break;
  
                  switch (SSL_get_error(con, 0)) {
                  case SSL_ERROR_WANT_WRITE:
                  case SSL_ERROR_WANT_ASYNC:
                  case SSL_ERROR_WANT_READ:
                      /* Just keep trying - busy waiting */
                      continue;
                  default:
                      BIO_printf(bio_err, "Error reading early data\n");
                      ERR_print_errors(bio_err);
                      goto err;
                  }
              }
              if (readbytes > 0) {
                  if (write_header) {
                      BIO_printf(bio_s_out, "Early data received:\n");
                      write_header = 0;
                  }
                  raw_write_stdout(buf, (unsigned int)readbytes);
                  (void)BIO_flush(bio_s_out);
              }
          }
          if (write_header) {
              if (SSL_get_early_data_status(con) == SSL_EARLY_DATA_NOT_SENT)
                  BIO_printf(bio_s_out, "No early data received\n");
              else
                  BIO_printf(bio_s_out, "Early data was rejected\n");
          } else {
              BIO_printf(bio_s_out, "\nEnd of early data\n");
          }
          if (SSL_is_init_finished(con))
              print_connection_info(con);
      }
  
      if (fileno_stdin() > s)
          width = fileno_stdin() + 1;
      else
          width = s + 1;
      for (;;) {
          int read_from_terminal;
          int read_from_sslcon;
  
          read_from_terminal = 0;
          read_from_sslcon = SSL_has_pending(con)
                             || (async && SSL_waiting_for_async(con));
  
          if (!read_from_sslcon) {
              FD_ZERO(&readfds);
  #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_MSDOS)
              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)
              /*
               * 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.
               */
              timeout.tv_sec = 1;
              timeout.tv_usec = 0;
              i = select(width, (void *)&readfds, NULL, NULL, &timeout);
              if (has_stdin_waiting())
                  read_from_terminal = 1;
              if ((i < 0) || (!i && !read_from_terminal))
                  continue;
  #else
              if (SSL_is_dtls(con) && DTLSv1_get_timeout(con, &timeout))
                  timeoutp = &timeout;
              else
                  timeoutp = NULL;
  
              i = select(width, (void *)&readfds, NULL, NULL, timeoutp);
  
              if ((SSL_is_dtls(con)) && 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");
                      (void)BIO_flush(bio_s_out);
                      BIO_closesocket(s);
                      close_accept_socket();
                      ret = -11;
                      goto err;
                  }
                  if ((i <= 0) || (buf[0] == 'q')) {
                      BIO_printf(bio_s_out, "DONE\n");
                      (void)BIO_flush(bio_s_out);
                      if (SSL_version(con) != DTLS1_VERSION)
                          BIO_closesocket(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;
                  }
                  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;
                  }
                  if ((buf[0] == 'K' || buf[0] == 'k')
                          && ((buf[1] == '\n') || (buf[1] == '\r'))) {
                      SSL_key_update(con, buf[0] == 'K' ?
                                          SSL_KEY_UPDATE_REQUESTED
                                          : SSL_KEY_UPDATE_NOT_REQUESTED);
                      i = SSL_do_handshake(con);
                      printf("SSL_do_handshake -> %d\n", i);
                      i = 0;
                      continue;
                  }
                  if (buf[0] == 'c' && ((buf[1] == '\n') || (buf[1] == '\r'))) {
                      SSL_set_verify(con, SSL_VERIFY_PEER, NULL);
                      i = SSL_verify_client_post_handshake(con);
                      if (i == 0) {
                          printf("Failed to initiate request\n");
                          ERR_print_errors(bio_err);
                      } else {
                          i = SSL_do_handshake(con);
                          printf("SSL_do_handshake -> %d\n", i);
                          i = 0;
                      }
                      continue;
                  }
                  if (buf[0] == 'P') {
                      static const char str[] = "Lets print some clear text\n";
                      BIO_write(SSL_get_wbio(con), str, sizeof(str) -1);
                  }
                  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_user_pwd_free(srp_callback_parm.user);
                      srp_callback_parm.user =
                          SRP_VBASE_get1_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_ASYNC:
                      BIO_printf(bio_s_out, "Write BLOCK (Async)\n");
                      (void)BIO_flush(bio_s_out);
                      wait_for_async(con);
                      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");
                      (void)BIO_flush(bio_s_out);
                      break;
                  case SSL_ERROR_WANT_ASYNC_JOB:
                      /*
                       * This shouldn't ever happen in s_server. Treat as an error
                       */
                  case SSL_ERROR_SYSCALL:
                  case SSL_ERROR_SSL:
                      BIO_printf(bio_s_out, "ERROR\n");
                      (void)BIO_flush(bio_s_out);
                      ERR_print_errors(bio_err);
                      ret = 1;
                      goto err;
                      /* break; */
                  case SSL_ERROR_ZERO_RETURN:
                      BIO_printf(bio_s_out, "DONE\n");
                      (void)BIO_flush(bio_s_out);
                      ret = 1;
                      goto err;
                  }
                  if (k > 0) {
                      l += k;
                      i -= k;
                  }
                  if (i <= 0)
                      break;
              }
          }
          if (read_from_sslcon) {
              /*
               * init_ssl_connection handles all async events itself so if we're
               * waiting for async then we shouldn't go back into
               * init_ssl_connection
               */
              if ((!async || !SSL_waiting_for_async(con))
                      && !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_user_pwd_free(srp_callback_parm.user);
                      srp_callback_parm.user =
                          SRP_VBASE_get1_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);
                      (void)BIO_flush(bio_s_out);
                      if (SSL_has_pending(con))
                          goto again;
                      break;
                  case SSL_ERROR_WANT_ASYNC:
                      BIO_printf(bio_s_out, "Read BLOCK (Async)\n");
                      (void)BIO_flush(bio_s_out);
                      wait_for_async(con);
                      break;
                  case SSL_ERROR_WANT_WRITE:
                  case SSL_ERROR_WANT_READ:
                      BIO_printf(bio_s_out, "Read BLOCK\n");
                      (void)BIO_flush(bio_s_out);
                      break;
                  case SSL_ERROR_WANT_ASYNC_JOB:
                      /*
                       * This shouldn't ever happen in s_server. Treat as an error
                       */
                  case SSL_ERROR_SYSCALL:
                  case SSL_ERROR_SSL:
                      BIO_printf(bio_s_out, "ERROR\n");
                      (void)BIO_flush(bio_s_out);
                      ERR_print_errors(bio_err);
                      ret = 1;
                      goto err;
                  case SSL_ERROR_ZERO_RETURN:
                      BIO_printf(bio_s_out, "DONE\n");
                      (void)BIO_flush(bio_s_out);
                      ret = 1;
                      goto err;
                  }
              }
          }
      }
   err:
      if (con != NULL) {
          BIO_printf(bio_s_out, "shutting down SSL\n");
          do_ssl_shutdown(con);
          SSL_free(con);
      }
      BIO_printf(bio_s_out, "CONNECTION CLOSED\n");
      OPENSSL_clear_free(buf, bufsize);
      return ret;
  }
  
  static void close_accept_socket(void)
  {
      BIO_printf(bio_err, "shutdown accept socket\n");
      if (accept_socket >= 0) {
          BIO_closesocket(accept_socket);
      }
  }
  
  static int is_retryable(SSL *con, int i)
  {
      int err = SSL_get_error(con, i);
  
      /* If it's not a fatal error, it must be retryable */
      return (err != SSL_ERROR_SSL)
             && (err != SSL_ERROR_SYSCALL)
             && (err != SSL_ERROR_ZERO_RETURN);
  }
  
  static int init_ssl_connection(SSL *con)
  {
      int i;
      long verify_err;
      int retry = 0;
  
      if (dtlslisten || stateless) {
          BIO_ADDR *client = NULL;
  
          if (dtlslisten) {
              if ((client = BIO_ADDR_new()) == NULL) {
                  BIO_printf(bio_err, "ERROR - memory\n");
                  return 0;
              }
              i = DTLSv1_listen(con, client);
          } else {
              i = SSL_stateless(con);
          }
          if (i > 0) {
              BIO *wbio;
              int fd = -1;
  
              if (dtlslisten) {
                  wbio = SSL_get_wbio(con);
                  if (wbio) {
                      BIO_get_fd(wbio, &fd);
                  }
  
                  if (!wbio || BIO_connect(fd, client, 0) == 0) {
                      BIO_printf(bio_err, "ERROR - unable to connect\n");
                      BIO_ADDR_free(client);
                      return 0;
                  }
  
                  (void)BIO_ctrl_set_connected(wbio, client);
                  BIO_ADDR_free(client);
                  dtlslisten = 0;
              } else {
                  stateless = 0;
              }
              i = SSL_accept(con);
          } else {
              BIO_ADDR_free(client);
          }
      } else {
          do {
              i = SSL_accept(con);
  
              if (i <= 0)
                  retry = is_retryable(con, i);
  #ifdef CERT_CB_TEST_RETRY
              {
                  while (i <= 0
                          && SSL_get_error(con, i) == SSL_ERROR_WANT_X509_LOOKUP
                          && SSL_get_state(con) == TLS_ST_SR_CLNT_HELLO) {
                      BIO_printf(bio_err,
                                 "LOOKUP from certificate callback during accept\n");
                      i = SSL_accept(con);
                      if (i <= 0)
                          retry = is_retryable(con, i);
                  }
              }
  #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_user_pwd_free(srp_callback_parm.user);
                  srp_callback_parm.user =
                      SRP_VBASE_get1_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);
                  if (i <= 0)
                      retry = is_retryable(con, i);
              }
  #endif
          } while (i < 0 && SSL_waiting_for_async(con));
      }
  
      if (i <= 0) {
          if (((dtlslisten || stateless) && i == 0)
                  || (!dtlslisten && !stateless && retry)) {
              BIO_printf(bio_s_out, "DELAY\n");
              return 1;
          }
  
          BIO_printf(bio_err, "ERROR\n");
  
          verify_err = SSL_get_verify_result(con);
          if (verify_err != X509_V_OK) {
              BIO_printf(bio_err, "verify error:%s\n",
                         X509_verify_cert_error_string(verify_err));
          }
          /* Always print any error messages */
          ERR_print_errors(bio_err);
          return 0;
      }
  
      print_connection_info(con);
      return 1;
  }
  
  static void print_connection_info(SSL *con)
  {
      const char *str;
      X509 *peer;
      char buf[BUFSIZ];
  #if !defined(OPENSSL_NO_NEXTPROTONEG)
      const unsigned char *next_proto_neg;
      unsigned next_proto_neg_len;
  #endif
      unsigned char *exportedkeymat;
      int i;
  
      if (s_brief)
          print_ssl_summary(con);
  
      PEM_write_bio_SSL_SESSION(bio_s_out, SSL_get_session(con));
  
      peer = SSL_get0_peer_certificate(con);
      if (peer != NULL) {
          BIO_printf(bio_s_out, "Client certificate\n");
          PEM_write_bio_X509(bio_s_out, peer);
          dump_cert_text(bio_s_out, peer);
          peer = NULL;
      }
  
      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_groups(bio_s_out, con, 0);
  #endif
      print_ca_names(bio_s_out, con);
      BIO_printf(bio_s_out, "CIPHER is %s\n", (str != NULL) ? str : "(NONE)");
  
  #if !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
  #ifndef OPENSSL_NO_SRTP
      {
          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);
      }
  #endif
      if (SSL_session_reused(con))
          BIO_printf(bio_s_out, "Reused session-id\n");
      BIO_printf(bio_s_out, "Secure Renegotiation IS%s supported\n",
                 SSL_get_secure_renegotiation_support(con) ? "" : " NOT");
      if ((SSL_get_options(con) & SSL_OP_NO_RENEGOTIATION))
          BIO_printf(bio_s_out, "Renegotiation is DISABLED\n");
  
      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 = app_malloc(keymatexportlen, "export key");
          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);
      }
  #ifndef OPENSSL_NO_KTLS
      if (BIO_get_ktls_send(SSL_get_wbio(con)))
          BIO_printf(bio_err, "Using Kernel TLS for sending\n");
      if (BIO_get_ktls_recv(SSL_get_rbio(con)))
          BIO_printf(bio_err, "Using Kernel TLS for receiving\n");
  #endif
  
      (void)BIO_flush(bio_s_out);
  }
  
  #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:
      BIO_free(bio);
      return ret;
  }
  #endif
  
  static int www_body(int s, int stype, int prot, 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;
  #ifdef RENEG
      int total_bytes = 0;
  #endif
      int width;
      fd_set readfds;
      const char *opmode;
  
      /* Set width for a select call if needed */
      width = s + 1;
  
      buf = app_malloc(bufsize, "server www buffer");
      io = BIO_new(BIO_f_buffer());
      ssl_bio = BIO_new(BIO_f_ssl());
      if ((io == NULL) || (ssl_bio == NULL))
          goto err;
  
      if (s_nbio) {
          if (!BIO_socket_nbio(s, 1))
              ERR_print_errors(bio_err);
          else if (!s_quiet)
              BIO_printf(bio_err, "Turned on non blocking io\n");
      }
  
      /* 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;
  
      if (s_tlsextdebug) {
          SSL_set_tlsext_debug_callback(con, tlsext_cb);
          SSL_set_tlsext_debug_arg(con, bio_s_out);
      }
  
      if (context != NULL
          && !SSL_set_session_id_context(con, context,
                                         strlen((char *)context))) {
          SSL_free(con);
          goto err;
      }
  
      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);
  
      /* No need to free |con| after this. Done by BIO_free(ssl_bio) */
      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) {
          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_gets(io, buf, bufsize - 1);
          if (i < 0) {            /* error */
              if (!BIO_should_retry(io) && !SSL_waiting_for_async(con)) {
                  if (!s_quiet)
                      ERR_print_errors(bio_err);
                  goto err;
              } else {
                  BIO_printf(bio_s_out, "read R BLOCK\n");
  #ifndef OPENSSL_NO_SRP
                  if (BIO_should_io_special(io)
                      && BIO_get_retry_reason(io) == BIO_RR_SSL_X509_LOOKUP) {
                      BIO_printf(bio_s_out, "LOOKUP renego during read\n");
                      SRP_user_pwd_free(srp_callback_parm.user);
                      srp_callback_parm.user =
                          SRP_VBASE_get1_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");
                      continue;
                  }
  #endif
  #if !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, 11) == 0))) {
              char *p;
              X509 *peer = NULL;
              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);
                  /* Send the HelloRequest */
                  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;
                  }
                  /* Wait for a ClientHello to come back */
                  FD_ZERO(&readfds);
                  openssl_fdset(s, &readfds);
                  i = select(width, (void *)&readfds, NULL, NULL, NULL);
                  if (i <= 0 || !FD_ISSET(s, &readfds)) {
                      BIO_printf(bio_s_out,
                                 "Error waiting for client response\n");
                      ERR_print_errors(bio_err);
                      goto err;
                  }
                  /*
                   * We're not actually expecting any data here and we ignore
                   * any that is sent. This is just to force the handshake that
                   * we're expecting to come from the client. If they haven't
                   * sent one there's not much we can do.
                   */
                  BIO_gets(io, buf, bufsize - 1);
              }
  
              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, OpenSSL_version(OPENSSL_VERSION)); */
              BIO_puts(io, "\n");
              for (i = 0; i < local_argc; i++) {
                  const char *myp;
                  for (myp = local_argv[i]; *myp; myp++)
                      switch (*myp) {
                      case '<':
                          BIO_puts(io, "&lt;");
                          break;
                      case '>':
                          BIO_puts(io, "&gt;");
                          break;
                      case '&':
                          BIO_puts(io, "&amp;");
                          break;
                      default:
                          BIO_write(io, myp, 1);
                          break;
                      }
                  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_groups(io, con, 0);
  #endif
              print_ca_names(io, con);
              BIO_printf(io, (SSL_session_reused(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_get0_peer_certificate(con);
              if (peer != NULL) {
                  BIO_printf(io, "Client certificate\n");
                  X509_print(io, peer);
                  PEM_write_bio_X509(io, peer);
                  peer = NULL;
              } else {
                  BIO_puts(io, "no client certificate available\n");
              }
              BIO_puts(io, "</pre></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;
  
                  if (e[0] == ':') {
                      /* Windows drive. We treat this the same way as ".." */
                      dot = -1;
                      break;
                  }
  
                  switch (dot) {
                  case 1:
                      dot = (e[0] == '.') ? 2 : 0;
                      break;
                  case 2:
                      dot = (e[0] == '.') ? 3 : 0;
                      break;
                  case 3:
                      dot = (e[0] == '/' || e[0] == '\\') ? -1 : 0;
                      break;
                  }
                  if (dot == 0)
                      dot = (e[0] == '/' || 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 '..' or ':'\r\n", p);
                  break;
              }
  
              if (*p == '/' || *p == '\\') {
                  BIO_puts(io, text);
                  BIO_printf(io, "'%s' is an invalid path\r\n", p);
                  break;
              }
  
              /* if a directory, do the index thang */
              if (app_isdir(p) > 0) {
                  BIO_puts(io, text);
                  BIO_printf(io, "'%s' is a directory\r\n", p);
                  break;
              }
  
              opmode = (http_server_binmode == 1) ? "rb" : "r";
              if ((file = BIO_new_file(p, opmode)) == NULL) {
                  BIO_puts(io, text);
                  BIO_printf(io, "Error opening '%s' mode='%s'\r\n", p, opmode);
                  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 */
  #ifndef OPENSSL_NO_KTLS
              if (use_sendfile) {
                  FILE *fp = NULL;
                  int fd;
                  struct stat st;
                  off_t offset = 0;
                  size_t filesize;
  
                  BIO_get_fp(file, &fp);
                  fd = fileno(fp);
                  if (fstat(fd, &st) < 0) {
                      BIO_printf(io, "Error fstat '%s'\r\n", p);
                      ERR_print_errors(io);
                      goto write_error;
                  }
  
                  filesize = st.st_size;
                  if (((int)BIO_flush(io)) < 0)
                      goto write_error;
  
                  for (;;) {
                      i = SSL_sendfile(con, fd, offset, filesize, 0);
                      if (i < 0) {
                          BIO_printf(io, "Error SSL_sendfile '%s'\r\n", p);
                          ERR_print_errors(io);
                          break;
                      } else {
                          offset += i;
                          filesize -= i;
                      }
  
                      if (filesize <= 0) {
                          if (!s_quiet)
                              BIO_printf(bio_err, "KTLS SENDFILE '%s' OK\n", p);
  
                          break;
                      }
                  }
              } else
  #endif
              {
                  for (;;) {
                      i = BIO_read(file, buf, bufsize);
                      if (i <= 0)
                          break;
  
  #ifdef RENEG
                      total_bytes += i;
                      BIO_printf(bio_err, "%d\n", i);
                      if (total_bytes > 3 * 1024) {
                          total_bytes = 0;
                          BIO_printf(bio_err, "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)
                                  && !SSL_waiting_for_async(con)) {
                                  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:
      /* make sure we re-use sessions */
      do_ssl_shutdown(con);
  
   err:
      OPENSSL_free(buf);
      BIO_free_all(io);
      return ret;
  }
  
  static int rev_body(int s, int stype, int prot, unsigned char *context)
  {
      char *buf = NULL;
      int i;
      int ret = 1;
      SSL *con;
      BIO *io, *ssl_bio, *sbio;
  
      buf = app_malloc(bufsize, "server rev buffer");
      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;
  
      if (s_tlsextdebug) {
          SSL_set_tlsext_debug_callback(con, tlsext_cb);
          SSL_set_tlsext_debug_arg(con, bio_s_out);
      }
      if (context != NULL
          && !SSL_set_session_id_context(con, context,
                                         strlen((char *)context))) {
          SSL_free(con);
          ERR_print_errors(bio_err);
          goto err;
      }
  
      sbio = BIO_new_socket(s, BIO_NOCLOSE);
      SSL_set_bio(con, sbio, sbio);
      SSL_set_accept_state(con);
  
      /* No need to free |con| after this. Done by BIO_free(ssl_bio) */
      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) {
          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;
          }
  #ifndef OPENSSL_NO_SRP
          if (BIO_should_io_special(io)
              && BIO_get_retry_reason(io) == BIO_RR_SSL_X509_LOOKUP) {
              BIO_printf(bio_s_out, "LOOKUP renego during accept\n");
              SRP_user_pwd_free(srp_callback_parm.user);
              srp_callback_parm.user =
                  SRP_VBASE_get1_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");
              continue;
          }
  #endif
      }
      BIO_printf(bio_err, "CONNECTION ESTABLISHED\n");
      print_ssl_summary(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");
  #ifndef OPENSSL_NO_SRP
                  if (BIO_should_io_special(io)
                      && BIO_get_retry_reason(io) == BIO_RR_SSL_X509_LOOKUP) {
                      BIO_printf(bio_s_out, "LOOKUP renego during read\n");
                      SRP_user_pwd_free(srp_callback_parm.user);
                      srp_callback_parm.user =
                          SRP_VBASE_get1_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");
                      continue;
                  }
  #endif
  #if !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) == 0)) {
                  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 */
      do_ssl_shutdown(con);
  
   err:
  
      OPENSSL_free(buf);
      BIO_free_all(io);
      return ret;
  }
  
  #define MAX_SESSION_ID_ATTEMPTS 10
  static int generate_session_id(SSL *ssl, unsigned char *id,
                                 unsigned int *id_len)
  {
      unsigned int count = 0;
      unsigned int session_id_prefix_len = strlen(session_id_prefix);
  
      do {
          if (RAND_bytes(id, *id_len) <= 0)
              return 0;
          /*
           * 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,
                 (session_id_prefix_len < *id_len) ?
                  session_id_prefix_len : *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 serialization. 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 = app_malloc(sizeof(*sess), "get session");
      unsigned char *p;
  
      SSL_SESSION_get_id(session, &sess->idlen);
      sess->derlen = i2d_SSL_SESSION(session, NULL);
      if (sess->derlen < 0) {
          BIO_printf(bio_err, "Error encoding session\n");
          OPENSSL_free(sess);
          return 0;
      }
  
      sess->id = OPENSSL_memdup(SSL_SESSION_get_id(session, NULL), sess->idlen);
      sess->der = app_malloc(sess->derlen, "get session buffer");
      if (!sess->id) {
          BIO_printf(bio_err, "Out of memory adding to external cache\n");
          OPENSSL_free(sess->id);
          OPENSSL_free(sess->der);
          OPENSSL_free(sess);
          return 0;
      }
      p = sess->der;
  
      /* Assume it still works. */
      if (i2d_SSL_SESSION(session, &p) != sess->derlen) {
          BIO_printf(bio_err, "Unexpected session encoding length\n");
          OPENSSL_free(sess->id);
          OPENSSL_free(sess->der);
          OPENSSL_free(sess);
          return 0;
      }
  
      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, const 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;
  }
  
  #endif                          /* OPENSSL_NO_SOCK */
  