text: /*
   * Copyright 1995-2019 The OpenSSL Project Authors. 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 "e_os.h"
  #include <ctype.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <errno.h>
  #include <openssl/e_os2.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 "apps.h"
  #include "progs.h"
  #include <openssl/x509.h>
  #include <openssl/ssl.h>
  #include <openssl/err.h>
  #include <openssl/pem.h>
  #include <openssl/rand.h>
  #include <openssl/ocsp.h>
  #include <openssl/bn.h>
  #include <openssl/trace.h>
  #include <openssl/async.h>
  #ifndef OPENSSL_NO_SRP
  # include <openssl/srp.h>
  #endif
  #ifndef OPENSSL_NO_CT
  # include <openssl/ct.h>
  #endif
  #include "s_apps.h"
  #include "timeouts.h"
  #include "internal/sockets.h"
  
  #if defined(__has_feature)
  # if __has_feature(memory_sanitizer)
  #  include <sanitizer/msan_interface.h>
  # endif
  #endif
  
  #undef BUFSIZZ
  #define BUFSIZZ 1024*8
  #define S_CLIENT_IRC_READ_TIMEOUT 8
  
  static char *prog;
  static int c_debug = 0;
  static int c_showcerts = 0;
  static char *keymatexportlabel = NULL;
  static int keymatexportlen = 20;
  static BIO *bio_c_out = NULL;
  static int c_quiet = 0;
  static char *sess_out = NULL;
  static SSL_SESSION *psksess = NULL;
  
  static void print_stuff(BIO *berr, SSL *con, int full);
  #ifndef OPENSSL_NO_OCSP
  static int ocsp_resp_cb(SSL *s, void *arg);
  #endif
  static int ldap_ExtendedResponse_parse(const char *buf, long rem);
  static int is_dNS_name(const char *host);
  
  static int saved_errno;
  
  static void save_errno(void)
  {
      saved_errno = errno;
      errno = 0;
  }
  
  static int restore_errno(void)
  {
      int ret = errno;
      errno = saved_errno;
      return ret;
  }
  
  static void do_ssl_shutdown(SSL *ssl)
  {
      int ret;
  
      do {
          /* We only do unidirectional shutdown */
          ret = SSL_shutdown(ssl);
          if (ret < 0) {
              switch (SSL_get_error(ssl, ret)) {
              case SSL_ERROR_WANT_READ:
              case SSL_ERROR_WANT_WRITE:
              case SSL_ERROR_WANT_ASYNC:
              case SSL_ERROR_WANT_ASYNC_JOB:
                  /* We just do busy waiting. Nothing clever */
                  continue;
              }
              ret = 0;
          }
      } while (ret < 0);
  }
  
  /* Default PSK identity and key */
  static char *psk_identity = "Client_identity";
  
  #ifndef OPENSSL_NO_PSK
  static unsigned int psk_client_cb(SSL *ssl, const char *hint, char *identity,
                                    unsigned int max_identity_len,
                                    unsigned char *psk,
                                    unsigned int max_psk_len)
  {
      int ret;
      long key_len;
      unsigned char *key;
  
      if (c_debug)
          BIO_printf(bio_c_out, "psk_client_cb\n");
      if (!hint) {
          /* no ServerKeyExchange message */
          if (c_debug)
              BIO_printf(bio_c_out,
                         "NULL received PSK identity hint, continuing anyway\n");
      } else if (c_debug) {
          BIO_printf(bio_c_out, "Received PSK identity hint '%s'\n", hint);
      }
  
      /*
       * lookup PSK identity and PSK key based on the given identity hint here
       */
      ret = BIO_snprintf(identity, max_identity_len, "%s", psk_identity);
      if (ret < 0 || (unsigned int)ret > max_identity_len)
          goto out_err;
      if (c_debug)
          BIO_printf(bio_c_out, "created identity '%s' len=%d\n", identity,
                     ret);
  
      /* 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 (max_psk_len > INT_MAX || key_len > (long)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 (c_debug)
          BIO_printf(bio_c_out, "created PSK len=%ld\n", key_len);
  
      return key_len;
   out_err:
      if (c_debug)
          BIO_printf(bio_err, "Error in PSK client callback\n");
      return 0;
  }
  #endif
  
  const unsigned char tls13_aes128gcmsha256_id[] = { 0x13, 0x01 };
  const unsigned char tls13_aes256gcmsha384_id[] = { 0x13, 0x02 };
  
  static int psk_use_session_cb(SSL *s, const EVP_MD *md,
                                const unsigned char **id, size_t *idlen,
                                SSL_SESSION **sess)
  {
      SSL_SESSION *usesess = NULL;
      const SSL_CIPHER *cipher = NULL;
  
      if (psksess != NULL) {
          SSL_SESSION_up_ref(psksess);
          usesess = psksess;
      } else {
          long key_len;
          unsigned char *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 SHA-256 */
          cipher = SSL_CIPHER_find(s, tls13_aes128gcmsha256_id);
          if (cipher == NULL) {
              BIO_printf(bio_err, "Error finding suitable ciphersuite\n");
              OPENSSL_free(key);
              return 0;
          }
  
          usesess = SSL_SESSION_new();
          if (usesess == NULL
                  || !SSL_SESSION_set1_master_key(usesess, key, key_len)
                  || !SSL_SESSION_set_cipher(usesess, cipher)
                  || !SSL_SESSION_set_protocol_version(usesess, TLS1_3_VERSION)) {
              OPENSSL_free(key);
              goto err;
          }
          OPENSSL_free(key);
      }
  
      cipher = SSL_SESSION_get0_cipher(usesess);
      if (cipher == NULL)
          goto err;
  
      if (md != NULL && SSL_CIPHER_get_handshake_digest(cipher) != md) {
          /* PSK not usable, ignore it */
          *id = NULL;
          *idlen = 0;
          *sess = NULL;
          SSL_SESSION_free(usesess);
      } else {
          *sess = usesess;
          *id = (unsigned char *)psk_identity;
          *idlen = strlen(psk_identity);
      }
  
      return 1;
  
   err:
      SSL_SESSION_free(usesess);
      return 0;
  }
  
  /* This is a context that we pass to callbacks */
  typedef struct tlsextctx_st {
      BIO *biodebug;
      int ack;
  } tlsextctx;
  
  static int ssl_servername_cb(SSL *s, int *ad, void *arg)
  {
      tlsextctx *p = (tlsextctx *) arg;
      const char *hn = SSL_get_servername(s, TLSEXT_NAMETYPE_host_name);
      if (SSL_get_servername_type(s) != -1)
          p->ack = !SSL_session_reused(s) && hn != NULL;
      else
          BIO_printf(bio_err, "Can't use SSL_get_servername\n");
  
      return SSL_TLSEXT_ERR_OK;
  }
  
  #ifndef OPENSSL_NO_SRP
  
  /* This is a context that we pass to all callbacks */
  typedef struct srp_arg_st {
      char *srppassin;
      char *srplogin;
      int msg;                    /* copy from c_msg */
      int debug;                  /* copy from c_debug */
      int amp;                    /* allow more groups */
      int strength;               /* minimal size for N */
  } SRP_ARG;
  
  static int srp_Verify_N_and_g(const BIGNUM *N, const BIGNUM *g)
  {
      BN_CTX *bn_ctx = BN_CTX_new();
      BIGNUM *p = BN_new();
      BIGNUM *r = BN_new();
      int ret =
          g != NULL && N != NULL && bn_ctx != NULL && BN_is_odd(N) &&
          BN_check_prime(N, bn_ctx, NULL) == 1 &&
          p != NULL && BN_rshift1(p, N) &&
          /* p = (N-1)/2 */
          BN_check_prime(p, bn_ctx, NULL) == 1 &&
          r != NULL &&
          /* verify g^((N-1)/2) == -1 (mod N) */
          BN_mod_exp(r, g, p, N, bn_ctx) &&
          BN_add_word(r, 1) && BN_cmp(r, N) == 0;
  
      BN_free(r);
      BN_free(p);
      BN_CTX_free(bn_ctx);
      return ret;
  }
  
  /*-
   * This callback is used here for two purposes:
   * - extended debugging
   * - making some primality tests for unknown groups
   * The callback is only called for a non default group.
   *
   * An application does not need the call back at all if
   * only the standard groups are used.  In real life situations,
   * client and server already share well known groups,
   * thus there is no need to verify them.
   * Furthermore, in case that a server actually proposes a group that
   * is not one of those defined in RFC 5054, it is more appropriate
   * to add the group to a static list and then compare since
   * primality tests are rather cpu consuming.
   */
  
  static int ssl_srp_verify_param_cb(SSL *s, void *arg)
  {
      SRP_ARG *srp_arg = (SRP_ARG *)arg;
      BIGNUM *N = NULL, *g = NULL;
  
      if (((N = SSL_get_srp_N(s)) == NULL) || ((g = SSL_get_srp_g(s)) == NULL))
          return 0;
      if (srp_arg->debug || srp_arg->msg || srp_arg->amp == 1) {
          BIO_printf(bio_err, "SRP parameters:\n");
          BIO_printf(bio_err, "\tN=");
          BN_print(bio_err, N);
          BIO_printf(bio_err, "\n\tg=");
          BN_print(bio_err, g);
          BIO_printf(bio_err, "\n");
      }
  
      if (SRP_check_known_gN_param(g, N))
          return 1;
  
      if (srp_arg->amp == 1) {
          if (srp_arg->debug)
              BIO_printf(bio_err,
                         "SRP param N and g are not known params, going to check deeper.\n");
  
          /*
           * The srp_moregroups is a real debugging feature. Implementors
           * should rather add the value to the known ones. The minimal size
           * has already been tested.
           */
          if (BN_num_bits(g) <= BN_BITS && srp_Verify_N_and_g(N, g))
              return 1;
      }
      BIO_printf(bio_err, "SRP param N and g rejected.\n");
      return 0;
  }
  
  # define PWD_STRLEN 1024
  
  static char *ssl_give_srp_client_pwd_cb(SSL *s, void *arg)
  {
      SRP_ARG *srp_arg = (SRP_ARG *)arg;
      char *pass = app_malloc(PWD_STRLEN + 1, "SRP password buffer");
      PW_CB_DATA cb_tmp;
      int l;
  
      cb_tmp.password = (char *)srp_arg->srppassin;
      cb_tmp.prompt_info = "SRP user";
      if ((l = password_callback(pass, PWD_STRLEN, 0, &cb_tmp)) < 0) {
          BIO_printf(bio_err, "Can't read Password\n");
          OPENSSL_free(pass);
          return NULL;
      }
      *(pass + l) = '\0';
  
      return pass;
  }
  
  #endif
  
  #ifndef OPENSSL_NO_NEXTPROTONEG
  /* This the context that we pass to next_proto_cb */
  typedef struct tlsextnextprotoctx_st {
      unsigned char *data;
      size_t len;
      int status;
  } tlsextnextprotoctx;
  
  static tlsextnextprotoctx next_proto;
  
  static int next_proto_cb(SSL *s, unsigned char **out, unsigned char *outlen,
                           const unsigned char *in, unsigned int inlen,
                           void *arg)
  {
      tlsextnextprotoctx *ctx = arg;
  
      if (!c_quiet) {
          /* We can assume that |in| is syntactically valid. */
          unsigned i;
          BIO_printf(bio_c_out, "Protocols advertised by server: ");
          for (i = 0; i < inlen;) {
              if (i)
                  BIO_write(bio_c_out, ", ", 2);
              BIO_write(bio_c_out, &in[i + 1], in[i]);
              i += in[i] + 1;
          }
          BIO_write(bio_c_out, "\n", 1);
      }
  
      ctx->status =
          SSL_select_next_proto(out, outlen, in, inlen, ctx->data, ctx->len);
      return SSL_TLSEXT_ERR_OK;
  }
  #endif                         /* ndef OPENSSL_NO_NEXTPROTONEG */
  
  static int serverinfo_cli_parse_cb(SSL *s, unsigned int ext_type,
                                     const unsigned char *in, size_t inlen,
                                     int *al, void *arg)
  {
      char pem_name[100];
      unsigned char ext_buf[4 + 65536];
  
      /* Reconstruct the type/len fields prior to extension data */
      inlen &= 0xffff; /* for formal memcmpy correctness */
      ext_buf[0] = (unsigned char)(ext_type >> 8);
      ext_buf[1] = (unsigned char)(ext_type);
      ext_buf[2] = (unsigned char)(inlen >> 8);
      ext_buf[3] = (unsigned char)(inlen);
      memcpy(ext_buf + 4, in, inlen);
  
      BIO_snprintf(pem_name, sizeof(pem_name), "SERVERINFO FOR EXTENSION %d",
                   ext_type);
      PEM_write_bio(bio_c_out, pem_name, "", ext_buf, 4 + inlen);
      return 1;
  }
  
  /*
   * Hex decoder that tolerates optional whitespace.  Returns number of bytes
   * produced, advances inptr to end of input string.
   */
  static ossl_ssize_t hexdecode(const char **inptr, void *result)
  {
      unsigned char **out = (unsigned char **)result;
      const char *in = *inptr;
      unsigned char *ret = app_malloc(strlen(in) / 2, "hexdecode");
      unsigned char *cp = ret;
      uint8_t byte;
      int nibble = 0;
  
      if (ret == NULL)
          return -1;
  
      for (byte = 0; *in; ++in) {
          int x;
  
          if (isspace(_UC(*in)))
              continue;
          x = OPENSSL_hexchar2int(*in);
          if (x < 0) {
              OPENSSL_free(ret);
              return 0;
          }
          byte |= (char)x;
          if ((nibble ^= 1) == 0) {
              *cp++ = byte;
              byte = 0;
          } else {
              byte <<= 4;
          }
      }
      if (nibble != 0) {
          OPENSSL_free(ret);
          return 0;
      }
      *inptr = in;
  
      return cp - (*out = ret);
  }
  
  /*
   * Decode unsigned 0..255, returns 1 on success, <= 0 on failure. Advances
   * inptr to next field skipping leading whitespace.
   */
  static ossl_ssize_t checked_uint8(const char **inptr, void *out)
  {
      uint8_t *result = (uint8_t *)out;
      const char *in = *inptr;
      char *endp;
      long v;
      int e;
  
      save_errno();
      v = strtol(in, &endp, 10);
      e = restore_errno();
  
      if (((v == LONG_MIN || v == LONG_MAX) && e == ERANGE) ||
          endp == in || !isspace(_UC(*endp)) ||
          v != (*result = (uint8_t) v)) {
          return -1;
      }
      for (in = endp; isspace(_UC(*in)); ++in)
          continue;
  
      *inptr = in;
      return 1;
  }
  
  struct tlsa_field {
      void *var;
      const char *name;
      ossl_ssize_t (*parser)(const char **, void *);
  };
  
  static int tlsa_import_rr(SSL *con, const char *rrdata)
  {
      /* Not necessary to re-init these values; the "parsers" do that. */
      static uint8_t usage;
      static uint8_t selector;
      static uint8_t mtype;
      static unsigned char *data;
      static struct tlsa_field tlsa_fields[] = {
          { &usage, "usage", checked_uint8 },
          { &selector, "selector", checked_uint8 },
          { &mtype, "mtype", checked_uint8 },
          { &data, "data", hexdecode },
          { NULL, }
      };
      struct tlsa_field *f;
      int ret;
      const char *cp = rrdata;
      ossl_ssize_t len = 0;
  
      for (f = tlsa_fields; f->var; ++f) {
          /* Returns number of bytes produced, advances cp to next field */
          if ((len = f->parser(&cp, f->var)) <= 0) {
              BIO_printf(bio_err, "%s: warning: bad TLSA %s field in: %s\n",
                         prog, f->name, rrdata);
              return 0;
          }
      }
      /* The data field is last, so len is its length */
      ret = SSL_dane_tlsa_add(con, usage, selector, mtype, data, len);
      OPENSSL_free(data);
  
      if (ret == 0) {
          ERR_print_errors(bio_err);
          BIO_printf(bio_err, "%s: warning: unusable TLSA rrdata: %s\n",
                     prog, rrdata);
          return 0;
      }
      if (ret < 0) {
          ERR_print_errors(bio_err);
          BIO_printf(bio_err, "%s: warning: error loading TLSA rrdata: %s\n",
                     prog, rrdata);
          return 0;
      }
      return ret;
  }
  
  static int tlsa_import_rrset(SSL *con, STACK_OF(OPENSSL_STRING) *rrset)
  {
      int num = sk_OPENSSL_STRING_num(rrset);
      int count = 0;
      int i;
  
      for (i = 0; i < num; ++i) {
          char *rrdata = sk_OPENSSL_STRING_value(rrset, i);
          if (tlsa_import_rr(con, rrdata) > 0)
              ++count;
      }
      return count > 0;
  }
  
  typedef enum OPTION_choice {
      OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
      OPT_4, OPT_6, OPT_HOST, OPT_PORT, OPT_CONNECT, OPT_BIND, OPT_UNIX,
      OPT_XMPPHOST, OPT_VERIFY, OPT_NAMEOPT,
      OPT_CERT, OPT_CRL, OPT_CRL_DOWNLOAD, OPT_SESS_OUT, OPT_SESS_IN,
      OPT_CERTFORM, OPT_CRLFORM, OPT_VERIFY_RET_ERROR, OPT_VERIFY_QUIET,
      OPT_BRIEF, OPT_PREXIT, OPT_CRLF, OPT_QUIET, OPT_NBIO,
      OPT_SSL_CLIENT_ENGINE, OPT_IGN_EOF, OPT_NO_IGN_EOF,
      OPT_DEBUG, OPT_TLSEXTDEBUG, OPT_STATUS, OPT_WDEBUG,
      OPT_MSG, OPT_MSGFILE, OPT_ENGINE, OPT_TRACE, OPT_SECURITY_DEBUG,
      OPT_SECURITY_DEBUG_VERBOSE, OPT_SHOWCERTS, OPT_NBIO_TEST, OPT_STATE,
      OPT_PSK_IDENTITY, OPT_PSK, OPT_PSK_SESS,
  #ifndef OPENSSL_NO_SRP
      OPT_SRPUSER, OPT_SRPPASS, OPT_SRP_STRENGTH, OPT_SRP_LATEUSER,
      OPT_SRP_MOREGROUPS,
  #endif
      OPT_SSL3, OPT_SSL_CONFIG,
      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_KEYFORM, OPT_PASS,
      OPT_CERT_CHAIN, OPT_KEY, OPT_RECONNECT, OPT_BUILD_CHAIN,
      OPT_NEXTPROTONEG, OPT_ALPN,
      OPT_CAPATH, OPT_NOCAPATH, OPT_CHAINCAPATH, OPT_VERIFYCAPATH,
      OPT_CAFILE, OPT_NOCAFILE, OPT_CHAINCAFILE, OPT_VERIFYCAFILE,
      OPT_CASTORE, OPT_NOCASTORE, OPT_CHAINCASTORE, OPT_VERIFYCASTORE,
      OPT_SERVERINFO, OPT_STARTTLS, OPT_SERVERNAME, OPT_NOSERVERNAME, OPT_ASYNC,
      OPT_USE_SRTP, OPT_KEYMATEXPORT, OPT_KEYMATEXPORTLEN, OPT_PROTOHOST,
      OPT_MAXFRAGLEN, OPT_MAX_SEND_FRAG, OPT_SPLIT_SEND_FRAG, OPT_MAX_PIPELINES,
      OPT_READ_BUF, OPT_KEYLOG_FILE, OPT_EARLY_DATA, OPT_REQCAFILE,
      OPT_V_ENUM,
      OPT_X_ENUM,
      OPT_S_ENUM,
      OPT_FALLBACKSCSV, OPT_NOCMDS, OPT_PROXY, OPT_PROXY_USER, OPT_PROXY_PASS,
      OPT_DANE_TLSA_DOMAIN,
  #ifndef OPENSSL_NO_CT
      OPT_CT, OPT_NOCT, OPT_CTLOG_FILE,
  #endif
      OPT_DANE_TLSA_RRDATA, OPT_DANE_EE_NO_NAME,
      OPT_ENABLE_PHA,
      OPT_SCTP_LABEL_BUG,
      OPT_R_ENUM
  } OPTION_CHOICE;
  
  const OPTIONS s_client_options[] = {
      {OPT_HELP_STR, 1, '-', "Usage: %s [options] [host:port]\n"},
  
      OPT_SECTION("General"),
      {"help", OPT_HELP, '-', "Display this summary"},
  #ifndef OPENSSL_NO_ENGINE
      {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
      {"ssl_client_engine", OPT_SSL_CLIENT_ENGINE, 's',
       "Specify engine to be used for client certificate operations"},
  #endif
      {"ssl_config", OPT_SSL_CONFIG, 's', "Use specified section for SSL_CTX configuration"},
  #ifndef OPENSSL_NO_CT
      {"ct", OPT_CT, '-', "Request and parse SCTs (also enables OCSP stapling)"},
      {"noct", OPT_NOCT, '-', "Do not request or parse SCTs (default)"},
      {"ctlogfile", OPT_CTLOG_FILE, '<', "CT log list CONF file"},
  #endif
  
      OPT_SECTION("Network"),
      {"host", OPT_HOST, 's', "Use -connect instead"},
      {"port", OPT_PORT, 'p', "Use -connect instead"},
      {"connect", OPT_CONNECT, 's',
       "TCP/IP where to connect (default is :" PORT ")"},
      {"bind", OPT_BIND, 's', "bind local address for connection"},
      {"proxy", OPT_PROXY, 's',
       "Connect to via specified proxy to the real server"},
      {"proxy_user", OPT_PROXY_USER, 's', "UserID for proxy authentication"},
      {"proxy_pass", OPT_PROXY_PASS, 's', "Proxy authentication password source"},
  #ifdef AF_UNIX
      {"unix", OPT_UNIX, 's', "Connect over the specified Unix-domain socket"},
  #endif
      {"4", OPT_4, '-', "Use IPv4 only"},
  #ifdef AF_INET6
      {"6", OPT_6, '-', "Use IPv6 only"},
  #endif
      {"maxfraglen", OPT_MAXFRAGLEN, 'p',
       "Enable Maximum Fragment Length Negotiation (len values: 512, 1024, 2048 and 4096)"},
      {"max_send_frag", OPT_MAX_SEND_FRAG, 'p', "Maximum Size of send frames "},
      {"split_send_frag", OPT_SPLIT_SEND_FRAG, 'p',
       "Size used to split data for encrypt pipelines"},
      {"max_pipelines", OPT_MAX_PIPELINES, 'p',
       "Maximum number of encrypt/decrypt pipelines to be used"},
      {"read_buf", OPT_READ_BUF, 'p',
       "Default read buffer size to be used for connections"},
      {"fallback_scsv", OPT_FALLBACKSCSV, '-', "Send the fallback SCSV"},
  
      OPT_SECTION("Identity"),
      {"verify", OPT_VERIFY, 'p', "Turn on peer certificate verification"},
      {"cert", OPT_CERT, '<', "Certificate file to use, PEM format assumed"},
      {"certform", OPT_CERTFORM, 'F',
       "Certificate format (PEM or DER) PEM default"},
      {"nameopt", OPT_NAMEOPT, 's', "Various certificate name options"},
      {"key", OPT_KEY, 's', "Private key file to use, if not in -cert file"},
      {"keyform", OPT_KEYFORM, 'E', "Key format (PEM, DER or engine) PEM default"},
      {"pass", OPT_PASS, 's', "Private key file pass phrase source"},
      {"CApath", OPT_CAPATH, '/', "PEM format directory of CA's"},
      {"CAfile", OPT_CAFILE, '<', "PEM format file 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"},
      {"requestCAfile", OPT_REQCAFILE, '<',
        "PEM format file of CA names to send to the server"},
      {"dane_tlsa_domain", OPT_DANE_TLSA_DOMAIN, 's', "DANE TLSA base domain"},
      {"dane_tlsa_rrdata", OPT_DANE_TLSA_RRDATA, 's',
       "DANE TLSA rrdata presentation form"},
      {"dane_ee_no_namechecks", OPT_DANE_EE_NO_NAME, '-',
       "Disable name checks when matching DANE-EE(3) TLSA records"},
      {"psk_identity", OPT_PSK_IDENTITY, 's', "PSK identity"},
      {"psk", OPT_PSK, 's', "PSK in hex (without 0x)"},
      {"psk_session", OPT_PSK_SESS, '<', "File to read PSK SSL session from"},
      {"name", OPT_PROTOHOST, 's',
       "Hostname to use for \"-starttls lmtp\", \"-starttls smtp\" or \"-starttls xmpp[-server]\""},
  
      OPT_SECTION("Session"),
      {"reconnect", OPT_RECONNECT, '-',
       "Drop and re-make the connection with the same Session-ID"},
      {"sess_out", OPT_SESS_OUT, '>', "File to write SSL session to"},
      {"sess_in", OPT_SESS_IN, '<', "File to read SSL session from"},
  
      OPT_SECTION("Input/Output"),
      {"crlf", OPT_CRLF, '-', "Convert LF from terminal into CRLF"},
      {"quiet", OPT_QUIET, '-', "No s_client output"},
      {"ign_eof", OPT_IGN_EOF, '-', "Ignore input eof (default when -quiet)"},
      {"no_ign_eof", OPT_NO_IGN_EOF, '-', "Don't ignore input eof"},
      {"starttls", OPT_STARTTLS, 's',
       "Use the appropriate STARTTLS command before starting TLS"},
      {"xmpphost", OPT_XMPPHOST, 's',
       "Alias of -name option for \"-starttls xmpp[-server]\""},
      {"brief", OPT_BRIEF, '-',
       "Restrict output to brief summary of connection parameters"},
      {"prexit", OPT_PREXIT, '-',
       "Print session information when the program exits"},
  
      OPT_SECTION("Debug"),
      {"showcerts", OPT_SHOWCERTS, '-',
       "Show all certificates sent by the server"},
      {"debug", OPT_DEBUG, '-', "Extra output"},
      {"msg", OPT_MSG, '-', "Show protocol messages"},
      {"msgfile", OPT_MSGFILE, '>',
       "File to send output of -msg or -trace, instead of stdout"},
      {"nbio_test", OPT_NBIO_TEST, '-', "More ssl protocol testing"},
      {"state", OPT_STATE, '-', "Print the ssl states"},
      {"keymatexport", OPT_KEYMATEXPORT, 's',
       "Export keying material using label"},
      {"keymatexportlen", OPT_KEYMATEXPORTLEN, 'p',
       "Export len bytes of keying material (default 20)"},
      {"security_debug", OPT_SECURITY_DEBUG, '-',
       "Enable security debug messages"},
      {"security_debug_verbose", OPT_SECURITY_DEBUG_VERBOSE, '-',
       "Output more security debug output"},
  #ifndef OPENSSL_NO_SSL_TRACE
      {"trace", OPT_TRACE, '-', "Show trace output of protocol messages"},
  #endif
  #ifdef WATT32
      {"wdebug", OPT_WDEBUG, '-', "WATT-32 tcp debugging"},
  #endif
      {"keylogfile", OPT_KEYLOG_FILE, '>', "Write TLS secrets to file"},
      {"nocommands", OPT_NOCMDS, '-', "Do not use interactive command letters"},
      {"servername", OPT_SERVERNAME, 's',
       "Set TLS extension servername (SNI) in ClientHello (default)"},
      {"noservername", OPT_NOSERVERNAME, '-',
       "Do not send the server name (SNI) extension in the ClientHello"},
      {"tlsextdebug", OPT_TLSEXTDEBUG, '-',
       "Hex dump of all TLS extensions received"},
  #ifndef OPENSSL_NO_OCSP
      {"status", OPT_STATUS, '-', "Request certificate status from server"},
  #endif
      {"serverinfo", OPT_SERVERINFO, 's',
       "types  Send empty ClientHello extensions (comma-separated numbers)"},
      {"alpn", OPT_ALPN, 's',
       "Enable ALPN extension, considering named protocols supported (comma-separated list)"},
      {"async", OPT_ASYNC, '-', "Support asynchronous operation"},
      {"nbio", OPT_NBIO, '-', "Use non-blocking IO"},
  
      OPT_SECTION("Protocol and version"),
  #ifndef OPENSSL_NO_SSL3
      {"ssl3", OPT_SSL3, '-', "Just use SSLv3"},
  #endif
  #ifndef OPENSSL_NO_TLS1
      {"tls1", OPT_TLS1, '-', "Just use TLSv1"},
  #endif
  #ifndef OPENSSL_NO_TLS1_1
      {"tls1_1", OPT_TLS1_1, '-', "Just use TLSv1.1"},
  #endif
  #ifndef OPENSSL_NO_TLS1_2
      {"tls1_2", OPT_TLS1_2, '-', "Just use TLSv1.2"},
  #endif
  #ifndef OPENSSL_NO_TLS1_3
      {"tls1_3", OPT_TLS1_3, '-', "Just use TLSv1.3"},
  #endif
  #ifndef OPENSSL_NO_DTLS
      {"dtls", OPT_DTLS, '-', "Use any version of DTLS"},
      {"timeout", OPT_TIMEOUT, '-',
       "Enable send/receive timeout on DTLS connections"},
      {"mtu", OPT_MTU, 'p', "Set the link layer MTU"},
  #endif
  #ifndef OPENSSL_NO_DTLS1
      {"dtls1", OPT_DTLS1, '-', "Just use DTLSv1"},
  #endif
  #ifndef OPENSSL_NO_DTLS1_2
      {"dtls1_2", OPT_DTLS1_2, '-', "Just use 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_NEXTPROTONEG
      {"nextprotoneg", OPT_NEXTPROTONEG, 's',
       "Enable NPN extension, considering named protocols supported (comma-separated list)"},
  #endif
      {"early_data", OPT_EARLY_DATA, '<', "File to send as early data"},
      {"enable_pha", OPT_ENABLE_PHA, '-', "Enable post-handshake-authentication"},
  #ifndef OPENSSL_NO_SRTP
      {"use_srtp", OPT_USE_SRTP, 's',
       "Offer SRTP key management with a colon-separated profile list"},
  #endif
  #ifndef OPENSSL_NO_SRP
      {"srpuser", OPT_SRPUSER, 's', "SRP authentication for 'user'"},
      {"srppass", OPT_SRPPASS, 's', "Password for 'user'"},
      {"srp_lateuser", OPT_SRP_LATEUSER, '-',
       "SRP username into second ClientHello message"},
      {"srp_moregroups", OPT_SRP_MOREGROUPS, '-',
       "Tolerate other than the known g N values."},
      {"srp_strength", OPT_SRP_STRENGTH, 'p', "Minimal length in bits for N"},
  #endif
  
      OPT_R_OPTIONS,
      OPT_S_OPTIONS,
      OPT_V_OPTIONS,
      {"CRL", OPT_CRL, '<', "CRL file to use"},
      {"crl_download", OPT_CRL_DOWNLOAD, '-', "Download CRL from distribution points"},
      {"CRLform", OPT_CRLFORM, 'F', "CRL format (PEM or DER) PEM is default"},
      {"verify_return_error", OPT_VERIFY_RET_ERROR, '-',
       "Close connection on verification error"},
      {"verify_quiet", OPT_VERIFY_QUIET, '-', "Restrict verify output to errors"},
      {"cert_chain", OPT_CERT_CHAIN, '<',
       "Certificate chain file (in PEM format)"},
      {"chainCApath", OPT_CHAINCAPATH, '/',
       "Use dir as certificate store path to build CA certificate chain"},
      {"chainCAstore", OPT_CHAINCASTORE, ':',
       "CA store URI for 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, ':',
       "CA store URI for certificate verification"},
      {"build_chain", OPT_BUILD_CHAIN, '-', "Build certificate chain"},
      {"chainCAfile", OPT_CHAINCAFILE, '<',
       "CA file for certificate chain (PEM format)"},
      OPT_X_OPTIONS,
  
      OPT_PARAMETERS(),
      {"host:port", 0, 0, "Where to connect; same as -connect option"},
      {NULL}
  };
  
  typedef enum PROTOCOL_choice {
      PROTO_OFF,
      PROTO_SMTP,
      PROTO_POP3,
      PROTO_IMAP,
      PROTO_FTP,
      PROTO_TELNET,
      PROTO_XMPP,
      PROTO_XMPP_SERVER,
      PROTO_CONNECT,
      PROTO_IRC,
      PROTO_MYSQL,
      PROTO_POSTGRES,
      PROTO_LMTP,
      PROTO_NNTP,
      PROTO_SIEVE,
      PROTO_LDAP
  } PROTOCOL_CHOICE;
  
  static const OPT_PAIR services[] = {
      {"smtp", PROTO_SMTP},
      {"pop3", PROTO_POP3},
      {"imap", PROTO_IMAP},
      {"ftp", PROTO_FTP},
      {"xmpp", PROTO_XMPP},
      {"xmpp-server", PROTO_XMPP_SERVER},
      {"telnet", PROTO_TELNET},
      {"irc", PROTO_IRC},
      {"mysql", PROTO_MYSQL},
      {"postgres", PROTO_POSTGRES},
      {"lmtp", PROTO_LMTP},
      {"nntp", PROTO_NNTP},
      {"sieve", PROTO_SIEVE},
      {"ldap", PROTO_LDAP},
      {NULL, 0}
  };
  
  #define IS_INET_FLAG(o) \
   (o == OPT_4 || o == OPT_6 || o == OPT_HOST || o == OPT_PORT || o == OPT_CONNECT)
  #define IS_UNIX_FLAG(o) (o == OPT_UNIX)
  
  #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)
  
  /* Free |*dest| and optionally set it to a copy of |source|. */
  static void freeandcopy(char **dest, const char *source)
  {
      OPENSSL_free(*dest);
      *dest = NULL;
      if (source != NULL)
          *dest = OPENSSL_strdup(source);
  }
  
  static int new_session_cb(SSL *s, SSL_SESSION *sess)
  {
  
      if (sess_out != NULL) {
          BIO *stmp = BIO_new_file(sess_out, "w");
  
          if (stmp == NULL) {
              BIO_printf(bio_err, "Error writing session file %s\n", sess_out);
          } else {
              PEM_write_bio_SSL_SESSION(stmp, sess);
              BIO_free(stmp);
          }
      }
  
      /*
       * Session data gets dumped on connection for TLSv1.2 and below, and on
       * arrival of the NewSessionTicket for TLSv1.3.
       */
      if (SSL_version(s) == TLS1_3_VERSION) {
          BIO_printf(bio_c_out,
                     "---\nPost-Handshake New Session Ticket arrived:\n");
          SSL_SESSION_print(bio_c_out, sess);
          BIO_printf(bio_c_out, "---\n");
      }
  
      /*
       * We always return a "fail" response so that the session gets freed again
       * because we haven't used the reference.
       */
      return 0;
  }
  
  int s_client_main(int argc, char **argv)
  {
      BIO *sbio;
      EVP_PKEY *key = NULL;
      SSL *con = NULL;
      SSL_CTX *ctx = NULL;
      STACK_OF(X509) *chain = NULL;
      X509 *cert = NULL;
      X509_VERIFY_PARAM *vpm = NULL;
      SSL_EXCERT *exc = NULL;
      SSL_CONF_CTX *cctx = NULL;
      STACK_OF(OPENSSL_STRING) *ssl_args = NULL;
      char *dane_tlsa_domain = NULL;
      STACK_OF(OPENSSL_STRING) *dane_tlsa_rrset = NULL;
      int dane_ee_no_name = 0;
      STACK_OF(X509_CRL) *crls = NULL;
      const SSL_METHOD *meth = TLS_client_method();
      const char *CApath = NULL, *CAfile = NULL, *CAstore = NULL;
      char *cbuf = NULL, *sbuf = NULL, *mbuf = NULL;
      char *proxystr = NULL, *proxyuser = NULL;
      char *proxypassarg = NULL, *proxypass = NULL;
      char *connectstr = NULL, *bindstr = NULL;
      char *cert_file = NULL, *key_file = NULL, *chain_file = NULL;
      char *chCApath = NULL, *chCAfile = NULL, *chCAstore = NULL, *host = NULL;
      char *port = OPENSSL_strdup(PORT);
      char *bindhost = NULL, *bindport = NULL;
      char *passarg = NULL, *pass = NULL;
      char *vfyCApath = NULL, *vfyCAfile = NULL, *vfyCAstore = NULL;
      char *ReqCAfile = NULL;
      char *sess_in = NULL, *crl_file = NULL, *p;
      const char *protohost = NULL;
      struct timeval timeout, *timeoutp;
      fd_set readfds, writefds;
      int noCApath = 0, noCAfile = 0, noCAstore = 0;
      int build_chain = 0, cbuf_len, cbuf_off, cert_format = FORMAT_PEM;
      int key_format = FORMAT_PEM, crlf = 0, full_log = 1, mbuf_len = 0;
      int prexit = 0;
      int sdebug = 0;
      int reconnect = 0, verify = SSL_VERIFY_NONE, vpmtouched = 0;
      int ret = 1, in_init = 1, i, nbio_test = 0, sock = -1, k, width, state = 0;
      int sbuf_len, sbuf_off, cmdletters = 1;
      int socket_family = AF_UNSPEC, socket_type = SOCK_STREAM, protocol = 0;
      int starttls_proto = PROTO_OFF, crl_format = FORMAT_PEM, crl_download = 0;
      int write_tty, read_tty, write_ssl, read_ssl, tty_on, ssl_pending;
  #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_MSDOS)
      int at_eof = 0;
  #endif
      int read_buf_len = 0;
      int fallback_scsv = 0;
      OPTION_CHOICE o;
  #ifndef OPENSSL_NO_DTLS
      int enable_timeouts = 0;
      long socket_mtu = 0;
  #endif
  #ifndef OPENSSL_NO_ENGINE
      ENGINE *ssl_client_engine = NULL;
  #endif
      ENGINE *e = NULL;
  #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_MSDOS)
      struct timeval tv;
  #endif
      const char *servername = NULL;
      int noservername = 0;
      const char *alpn_in = NULL;
      tlsextctx tlsextcbp = { NULL, 0 };
      const char *ssl_config = NULL;
  #define MAX_SI_TYPES 100
      unsigned short serverinfo_types[MAX_SI_TYPES];
      int serverinfo_count = 0, start = 0, len;
  #ifndef OPENSSL_NO_NEXTPROTONEG
      const char *next_proto_neg_in = NULL;
  #endif
  #ifndef OPENSSL_NO_SRP
      char *srppass = NULL;
      int srp_lateuser = 0;
      SRP_ARG srp_arg = { NULL, NULL, 0, 0, 0, 1024 };
  #endif
  #ifndef OPENSSL_NO_SRTP
      char *srtp_profiles = NULL;
  #endif
  #ifndef OPENSSL_NO_CT
      char *ctlog_file = NULL;
      int ct_validation = 0;
  #endif
      int min_version = 0, max_version = 0, prot_opt = 0, no_prot_opt = 0;
      int async = 0;
      unsigned int max_send_fragment = 0;
      unsigned int split_send_fragment = 0, max_pipelines = 0;
      enum { use_inet, use_unix, use_unknown } connect_type = use_unknown;
      int count4or6 = 0;
      uint8_t maxfraglen = 0;
      int c_nbio = 0, c_msg = 0, c_ign_eof = 0, c_brief = 0;
      int c_tlsextdebug = 0;
  #ifndef OPENSSL_NO_OCSP
      int c_status_req = 0;
  #endif
      BIO *bio_c_msg = NULL;
      const char *keylog_file = NULL, *early_data_file = NULL;
  #ifndef OPENSSL_NO_DTLS
      int isdtls = 0;
  #endif
      char *psksessf = NULL;
      int enable_pha = 0;
  #ifndef OPENSSL_NO_SCTP
      int sctp_label_bug = 0;
  #endif
  
      FD_ZERO(&readfds);
      FD_ZERO(&writefds);
  /* Known false-positive of MemorySanitizer. */
  #if defined(__has_feature)
  # if __has_feature(memory_sanitizer)
      __msan_unpoison(&readfds, sizeof(readfds));
      __msan_unpoison(&writefds, sizeof(writefds));
  # endif
  #endif
  
      prog = opt_progname(argv[0]);
      c_quiet = 0;
      c_debug = 0;
      c_showcerts = 0;
      c_nbio = 0;
      vpm = X509_VERIFY_PARAM_new();
      cctx = SSL_CONF_CTX_new();
  
      if (vpm == NULL || cctx == NULL) {
          BIO_printf(bio_err, "%s: out of memory\n", prog);
          goto end;
      }
  
      cbuf = app_malloc(BUFSIZZ, "cbuf");
      sbuf = app_malloc(BUFSIZZ, "sbuf");
      mbuf = app_malloc(BUFSIZZ, "mbuf");
  
      SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CLIENT | SSL_CONF_FLAG_CMDLINE);
  
      prog = opt_init(argc, argv, s_client_options);
      while ((o = opt_next()) != OPT_EOF) {
          /* Check for intermixing flags. */
          if (connect_type == use_unix && IS_INET_FLAG(o)) {
              BIO_printf(bio_err,
                         "%s: Intermixed protocol flags (unix and internet domains)\n",
                         prog);
              goto end;
          }
          if (connect_type == use_inet && IS_UNIX_FLAG(o)) {
              BIO_printf(bio_err,
                         "%s: Intermixed protocol flags (internet and unix domains)\n",
                         prog);
              goto end;
          }
  
          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_client_options);
              ret = 0;
              goto end;
          case OPT_4:
              connect_type = use_inet;
              socket_family = AF_INET;
              count4or6++;
              break;
  #ifdef AF_INET6
          case OPT_6:
              connect_type = use_inet;
              socket_family = AF_INET6;
              count4or6++;
              break;
  #endif
          case OPT_HOST:
              connect_type = use_inet;
              freeandcopy(&host, opt_arg());
              break;
          case OPT_PORT:
              connect_type = use_inet;
              freeandcopy(&port, opt_arg());
              break;
          case OPT_CONNECT:
              connect_type = use_inet;
              freeandcopy(&connectstr, opt_arg());
              break;
          case OPT_BIND:
              freeandcopy(&bindstr, opt_arg());
              break;
          case OPT_PROXY:
              proxystr = opt_arg();
              starttls_proto = PROTO_CONNECT;
              break;
          case OPT_PROXY_USER:
              proxyuser = opt_arg();
              break;
          case OPT_PROXY_PASS:
              proxypassarg = opt_arg();
              break;
  #ifdef AF_UNIX
          case OPT_UNIX:
              connect_type = use_unix;
              socket_family = AF_UNIX;
              freeandcopy(&host, opt_arg());
              break;
  #endif
          case OPT_XMPPHOST:
              /* fall through, since this is an alias */
          case OPT_PROTOHOST:
              protohost = opt_arg();
              break;
          case OPT_VERIFY:
              verify = SSL_VERIFY_PEER;
              verify_args.depth = atoi(opt_arg());
              if (!c_quiet)
                  BIO_printf(bio_err, "verify depth is %d\n", verify_args.depth);
              break;
          case OPT_CERT:
              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_SESS_OUT:
              sess_out = opt_arg();
              break;
          case OPT_SESS_IN:
              sess_in = opt_arg();
              break;
          case OPT_CERTFORM:
              if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &cert_format))
                  goto opthelp;
              break;
          case OPT_CRLFORM:
              if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &crl_format))
                  goto opthelp;
              break;
          case OPT_VERIFY_RET_ERROR:
              verify = SSL_VERIFY_PEER;
              verify_args.return_error = 1;
              break;
          case OPT_VERIFY_QUIET:
              verify_args.quiet = 1;
              break;
          case OPT_BRIEF:
              c_brief = verify_args.quiet = c_quiet = 1;
              break;
          case OPT_S_CASES:
              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_PREXIT:
              prexit = 1;
              break;
          case OPT_CRLF:
              crlf = 1;
              break;
          case OPT_QUIET:
              c_quiet = c_ign_eof = 1;
              break;
          case OPT_NBIO:
              c_nbio = 1;
              break;
          case OPT_NOCMDS:
              cmdletters = 0;
              break;
          case OPT_ENGINE:
              e = setup_engine(opt_arg(), 1);
              break;
          case OPT_SSL_CLIENT_ENGINE:
  #ifndef OPENSSL_NO_ENGINE
              ssl_client_engine = ENGINE_by_id(opt_arg());
              if (ssl_client_engine == NULL) {
                  BIO_printf(bio_err, "Error getting client auth engine\n");
                  goto opthelp;
              }
  #endif
              break;
          case OPT_R_CASES:
              if (!opt_rand(o))
                  goto end;
              break;
          case OPT_IGN_EOF:
              c_ign_eof = 1;
              break;
          case OPT_NO_IGN_EOF:
              c_ign_eof = 0;
              break;
          case OPT_DEBUG:
              c_debug = 1;
              break;
          case OPT_TLSEXTDEBUG:
              c_tlsextdebug = 1;
              break;
          case OPT_STATUS:
  #ifndef OPENSSL_NO_OCSP
              c_status_req = 1;
  #endif
              break;
          case OPT_WDEBUG:
  #ifdef WATT32
              dbug_init();
  #endif
              break;
          case OPT_MSG:
              c_msg = 1;
              break;
          case OPT_MSGFILE:
              bio_c_msg = BIO_new_file(opt_arg(), "w");
              break;
          case OPT_TRACE:
  #ifndef OPENSSL_NO_SSL_TRACE
              c_msg = 2;
  #endif
              break;
          case OPT_SECURITY_DEBUG:
              sdebug = 1;
              break;
          case OPT_SECURITY_DEBUG_VERBOSE:
              sdebug = 2;
              break;
          case OPT_SHOWCERTS:
              c_showcerts = 1;
              break;
          case OPT_NBIO_TEST:
              nbio_test = 1;
              break;
          case OPT_STATE:
              state = 1;
              break;
          case OPT_PSK_IDENTITY:
              psk_identity = opt_arg();
              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;
  #ifndef OPENSSL_NO_SRP
          case OPT_SRPUSER:
              srp_arg.srplogin = opt_arg();
              if (min_version < TLS1_VERSION)
                  min_version = TLS1_VERSION;
              break;
          case OPT_SRPPASS:
              srppass = opt_arg();
              if (min_version < TLS1_VERSION)
                  min_version = TLS1_VERSION;
              break;
          case OPT_SRP_STRENGTH:
              srp_arg.strength = atoi(opt_arg());
              BIO_printf(bio_err, "SRP minimal length for N is %d\n",
                         srp_arg.strength);
              if (min_version < TLS1_VERSION)
                  min_version = TLS1_VERSION;
              break;
          case OPT_SRP_LATEUSER:
              srp_lateuser = 1;
              if (min_version < TLS1_VERSION)
                  min_version = TLS1_VERSION;
              break;
          case OPT_SRP_MOREGROUPS:
              srp_arg.amp = 1;
              if (min_version < TLS1_VERSION)
                  min_version = TLS1_VERSION;
              break;
  #endif
          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_client_method();
              socket_type = SOCK_DGRAM;
              isdtls = 1;
  #endif
              break;
          case OPT_DTLS1:
  #ifndef OPENSSL_NO_DTLS1
              meth = DTLS_client_method();
              min_version = DTLS1_VERSION;
              max_version = DTLS1_VERSION;
              socket_type = SOCK_DGRAM;
              isdtls = 1;
  #endif
              break;
          case OPT_DTLS1_2:
  #ifndef OPENSSL_NO_DTLS1_2
              meth = DTLS_client_method();
              min_version = DTLS1_2_VERSION;
              max_version = DTLS1_2_VERSION;
              socket_type = SOCK_DGRAM;
              isdtls = 1;
  #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_FALLBACKSCSV:
              fallback_scsv = 1;
              break;
          case OPT_KEYFORM:
              if (!opt_format(opt_arg(), OPT_FMT_PDE, &key_format))
                  goto opthelp;
              break;
          case OPT_PASS:
              passarg = opt_arg();
              break;
          case OPT_CERT_CHAIN:
              chain_file = opt_arg();
              break;
          case OPT_KEY:
              key_file = opt_arg();
              break;
          case OPT_RECONNECT:
              reconnect = 5;
              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_BUILD_CHAIN:
              build_chain = 1;
              break;
          case OPT_REQCAFILE:
              ReqCAfile = opt_arg();
              break;
          case OPT_CAFILE:
              CAfile = opt_arg();
              break;
          case OPT_NOCAFILE:
              noCAfile = 1;
              break;
  #ifndef OPENSSL_NO_CT
          case OPT_NOCT:
              ct_validation = 0;
              break;
          case OPT_CT:
              ct_validation = 1;
              break;
          case OPT_CTLOG_FILE:
              ctlog_file = opt_arg();
              break;
  #endif
          case OPT_CHAINCAFILE:
              chCAfile = opt_arg();
              break;
          case OPT_VERIFYCAFILE:
              vfyCAfile = 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_DANE_TLSA_DOMAIN:
              dane_tlsa_domain = opt_arg();
              break;
          case OPT_DANE_TLSA_RRDATA:
              if (dane_tlsa_rrset == NULL)
                  dane_tlsa_rrset = sk_OPENSSL_STRING_new_null();
              if (dane_tlsa_rrset == NULL ||
                  !sk_OPENSSL_STRING_push(dane_tlsa_rrset, opt_arg())) {
                  BIO_printf(bio_err, "%s: Memory allocation failure\n", prog);
                  goto end;
              }
              break;
          case OPT_DANE_EE_NO_NAME:
              dane_ee_no_name = 1;
              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_SERVERINFO:
              p = opt_arg();
              len = strlen(p);
              for (start = 0, i = 0; i <= len; ++i) {
                  if (i == len || p[i] == ',') {
                      serverinfo_types[serverinfo_count] = atoi(p + start);
                      if (++serverinfo_count == MAX_SI_TYPES)
                          break;
                      start = i + 1;
                  }
              }
              break;
          case OPT_STARTTLS:
              if (!opt_pair(opt_arg(), services, &starttls_proto))
                  goto end;
              break;
          case OPT_SERVERNAME:
              servername = opt_arg();
              break;
          case OPT_NOSERVERNAME:
              noservername = 1;
              break;
          case OPT_USE_SRTP:
  #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_MAXFRAGLEN:
              len = atoi(opt_arg());
              switch (len) {
              case 512:
                  maxfraglen = TLSEXT_max_fragment_length_512;
                  break;
              case 1024:
                  maxfraglen = TLSEXT_max_fragment_length_1024;
                  break;
              case 2048:
                  maxfraglen = TLSEXT_max_fragment_length_2048;
                  break;
              case 4096:
                  maxfraglen = TLSEXT_max_fragment_length_4096;
                  break;
              default:
                  BIO_printf(bio_err,
                             "%s: Max Fragment Len %u is out of permitted values",
                             prog, len);
                  goto opthelp;
              }
              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_EARLY_DATA:
              early_data_file = opt_arg();
              break;
          case OPT_ENABLE_PHA:
              enable_pha = 1;
              break;
          }
      }
  
      if (count4or6 >= 2) {
          BIO_printf(bio_err, "%s: Can't use both -4 and -6\n", prog);
          goto opthelp;
      }
      if (noservername) {
          if (servername != NULL) {
              BIO_printf(bio_err,
                         "%s: Can't use -servername and -noservername together\n",
                         prog);
              goto opthelp;
          }
          if (dane_tlsa_domain != NULL) {
              BIO_printf(bio_err,
                 "%s: Can't use -dane_tlsa_domain and -noservername together\n",
                 prog);
              goto opthelp;
          }
      }
      argc = opt_num_rest();
      if (argc == 1) {
          /* If there's a positional argument, it's the equivalent of
           * OPT_CONNECT.
           * Don't allow -connect and a separate argument.
           */
          if (connectstr != NULL) {
              BIO_printf(bio_err,
                         "%s: must not provide both -connect option and target parameter\n",
                         prog);
              goto opthelp;
          }
          connect_type = use_inet;
          freeandcopy(&connectstr, *opt_rest());
      } else if (argc != 0) {
          goto opthelp;
      }
  
  #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
      if (proxystr != NULL) {
          int res;
          char *tmp_host = host, *tmp_port = port;
          if (connectstr == NULL) {
              BIO_printf(bio_err, "%s: -proxy requires use of -connect or target parameter\n", prog);
              goto opthelp;
          }
          res = BIO_parse_hostserv(proxystr, &host, &port, BIO_PARSE_PRIO_HOST);
          if (tmp_host != host)
              OPENSSL_free(tmp_host);
          if (tmp_port != port)
              OPENSSL_free(tmp_port);
          if (!res) {
              BIO_printf(bio_err,
                         "%s: -proxy argument malformed or ambiguous\n", prog);
              goto end;
          }
      } else {
          int res = 1;
          char *tmp_host = host, *tmp_port = port;
          if (connectstr != NULL)
              res = BIO_parse_hostserv(connectstr, &host, &port,
                                       BIO_PARSE_PRIO_HOST);
          if (tmp_host != host)
              OPENSSL_free(tmp_host);
          if (tmp_port != port)
              OPENSSL_free(tmp_port);
          if (!res) {
              BIO_printf(bio_err,
                         "%s: -connect argument or target parameter malformed or ambiguous\n",
                         prog);
              goto end;
          }
      }
  
      if (bindstr != NULL) {
          int res;
          res = BIO_parse_hostserv(bindstr, &bindhost, &bindport,
                                   BIO_PARSE_PRIO_HOST);
          if (!res) {
              BIO_printf(bio_err,
                         "%s: -bind argument parameter malformed or ambiguous\n",
                         prog);
              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
  
  #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
  
  #if !defined(OPENSSL_NO_NEXTPROTONEG)
      next_proto.status = -1;
      if (next_proto_neg_in) {
          next_proto.data =
              next_protos_parse(&next_proto.len, next_proto_neg_in);
          if (next_proto.data == NULL) {
              BIO_printf(bio_err, "Error parsing -nextprotoneg argument\n");
              goto end;
          }
      } else
          next_proto.data = NULL;
  #endif
  
      if (!app_passwd(passarg, NULL, &pass, NULL)) {
          BIO_printf(bio_err, "Error getting private key password\n");
          goto end;
      }
  
      if (!app_passwd(proxypassarg, NULL, &proxypass, NULL)) {
          BIO_printf(bio_err, "Error getting proxy password\n");
          goto end;
      }
  
      if (proxypass != NULL && proxyuser == NULL) {
          BIO_printf(bio_err, "Error: Must specify proxy_user with proxy_pass\n");
          goto end;
      }
  
      if (key_file == NULL)
          key_file = cert_file;
  
      if (key_file != NULL) {
          key = load_key(key_file, key_format, 0, pass, e,
                         "client certificate private key file");
          if (key == NULL) {
              ERR_print_errors(bio_err);
              goto end;
          }
      }
  
      if (cert_file != NULL) {
          cert = load_cert(cert_file, cert_format, "client certificate file");
          if (cert == NULL) {
              ERR_print_errors(bio_err);
              goto end;
          }
      }
  
      if (chain_file != NULL) {
          if (!load_certs(chain_file, &chain, FORMAT_PEM, NULL,
                          "client certificate chain"))
              goto end;
      }
  
      if (crl_file != NULL) {
          X509_CRL *crl;
          crl = load_crl(crl_file, crl_format);
          if (crl == NULL) {
              BIO_puts(bio_err, "Error loading CRL\n");
              ERR_print_errors(bio_err);
              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 (!load_excert(&exc))
          goto end;
  
      if (bio_c_out == NULL) {
          if (c_quiet && !c_debug) {
              bio_c_out = BIO_new(BIO_s_null());
              if (c_msg && bio_c_msg == NULL)
                  bio_c_msg = dup_bio_out(FORMAT_TEXT);
          } else if (bio_c_out == NULL)
              bio_c_out = dup_bio_out(FORMAT_TEXT);
      }
  #ifndef OPENSSL_NO_SRP
      if (!app_passwd(srppass, NULL, &srp_arg.srppassin, NULL)) {
          BIO_printf(bio_err, "Error getting password\n");
          goto end;
      }
  #endif
  
      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 != NULL) {
          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 (vpmtouched && !SSL_CTX_set1_param(ctx, vpm)) {
          BIO_printf(bio_err, "Error setting verify params\n");
          ERR_print_errors(bio_err);
          goto end;
      }
  
      if (async) {
          SSL_CTX_set_mode(ctx, SSL_MODE_ASYNC);
      }
  
      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);
      }
  
      if (maxfraglen > 0
              && !SSL_CTX_set_tlsext_max_fragment_length(ctx, maxfraglen)) {
          BIO_printf(bio_err,
                     "%s: Max Fragment Length code %u is out of permitted values"
                     "\n", prog, maxfraglen);
          goto end;
      }
  
      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 (ReqCAfile != NULL) {
          STACK_OF(X509_NAME) *nm = sk_X509_NAME_new_null();
  
          if (nm == NULL || !SSL_add_file_cert_subjects_to_stack(nm, ReqCAfile)) {
              sk_X509_NAME_pop_free(nm, X509_NAME_free);
              BIO_printf(bio_err, "Error loading CA names\n");
              ERR_print_errors(bio_err);
              goto end;
          }
          SSL_CTX_set0_CA_list(ctx, nm);
      }
  #ifndef OPENSSL_NO_ENGINE
      if (ssl_client_engine) {
          if (!SSL_CTX_set_client_cert_engine(ctx, ssl_client_engine)) {
              BIO_puts(bio_err, "Error setting client auth engine\n");
              ERR_print_errors(bio_err);
              ENGINE_free(ssl_client_engine);
              goto end;
          }
          ENGINE_free(ssl_client_engine);
      }
  #endif
  
  #ifndef OPENSSL_NO_PSK
      if (psk_key != NULL) {
          if (c_debug)
              BIO_printf(bio_c_out, "PSK key given, setting client callback\n");
          SSL_CTX_set_psk_client_callback(ctx, psk_client_cb);
      }
  #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_use_session_callback(ctx, psk_use_session_cb);
  
  #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 (exc != NULL)
          ssl_ctx_set_excert(ctx, exc);
  
  #if !defined(OPENSSL_NO_NEXTPROTONEG)
      if (next_proto.data != NULL)
          SSL_CTX_set_next_proto_select_cb(ctx, next_proto_cb, &next_proto);
  #endif
      if (alpn_in) {
          size_t alpn_len;
          unsigned char *alpn = next_protos_parse(&alpn_len, alpn_in);
  
          if (alpn == NULL) {
              BIO_printf(bio_err, "Error parsing -alpn argument\n");
              goto end;
          }
          /* Returns 0 on success! */
          if (SSL_CTX_set_alpn_protos(ctx, alpn, alpn_len) != 0) {
              BIO_printf(bio_err, "Error setting ALPN\n");
              goto end;
          }
          OPENSSL_free(alpn);
      }
  
      for (i = 0; i < serverinfo_count; i++) {
          if (!SSL_CTX_add_client_custom_ext(ctx,
                                             serverinfo_types[i],
                                             NULL, NULL, NULL,
                                             serverinfo_cli_parse_cb, NULL)) {
              BIO_printf(bio_err,
                         "Warning: Unable to add custom extension %u, skipping\n",
                         serverinfo_types[i]);
          }
      }
  
      if (state)
          SSL_CTX_set_info_callback(ctx, apps_ssl_info_callback);
  
  #ifndef OPENSSL_NO_CT
      /* Enable SCT processing, without early connection termination */
      if (ct_validation &&
          !SSL_CTX_enable_ct(ctx, SSL_CT_VALIDATION_PERMISSIVE)) {
          ERR_print_errors(bio_err);
          goto end;
      }
  
      if (!ctx_set_ctlog_list_file(ctx, ctlog_file)) {
          if (ct_validation) {
              ERR_print_errors(bio_err);
              goto end;
          }
  
          /*
           * If CT validation is not enabled, the log list isn't needed so don't
           * show errors or abort. We try to load it regardless because then we
           * can show the names of the logs any SCTs came from (SCTs may be seen
           * even with validation disabled).
           */
          ERR_clear_error();
      }
  #endif
  
      SSL_CTX_set_verify(ctx, verify, verify_callback);
  
      if (!ctx_set_verify_locations(ctx, CAfile, noCAfile, CApath, noCApath,
                                    CAstore, noCAstore)) {
          ERR_print_errors(bio_err);
          goto end;
      }
  
      ssl_ctx_add_crls(ctx, crls, crl_download);
  
      if (!set_cert_key_stuff(ctx, cert, key, chain, build_chain))
          goto end;
  
      if (!noservername) {
          tlsextcbp.biodebug = bio_err;
          SSL_CTX_set_tlsext_servername_callback(ctx, ssl_servername_cb);
          SSL_CTX_set_tlsext_servername_arg(ctx, &tlsextcbp);
      }
  # ifndef OPENSSL_NO_SRP
      if (srp_arg.srplogin) {
          if (!srp_lateuser && !SSL_CTX_set_srp_username(ctx, srp_arg.srplogin)) {
              BIO_printf(bio_err, "Unable to set SRP username\n");
              goto end;
          }
          srp_arg.msg = c_msg;
          srp_arg.debug = c_debug;
          SSL_CTX_set_srp_cb_arg(ctx, &srp_arg);
          SSL_CTX_set_srp_client_pwd_callback(ctx, ssl_give_srp_client_pwd_cb);
          SSL_CTX_set_srp_strength(ctx, srp_arg.strength);
          if (c_msg || c_debug || srp_arg.amp == 0)
              SSL_CTX_set_srp_verify_param_callback(ctx,
                                                    ssl_srp_verify_param_cb);
      }
  # endif
  
      if (dane_tlsa_domain != NULL) {
          if (SSL_CTX_dane_enable(ctx) <= 0) {
              BIO_printf(bio_err,
                         "%s: Error enabling DANE TLSA authentication.\n",
                         prog);
              ERR_print_errors(bio_err);
              goto end;
          }
      }
  
      /*
       * In TLSv1.3 NewSessionTicket messages arrive after the handshake and can
       * come at any time. Therefore we use a callback to write out the session
       * when we know about it. This approach works for < TLSv1.3 as well.
       */
      SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_CLIENT
                                          | SSL_SESS_CACHE_NO_INTERNAL_STORE);
      SSL_CTX_sess_set_new_cb(ctx, new_session_cb);
  
      if (set_keylog_file(ctx, keylog_file))
          goto end;
  
      con = SSL_new(ctx);
      if (con == NULL)
          goto end;
  
      if (enable_pha)
          SSL_set_post_handshake_auth(con, 1);
  
      if (sess_in != NULL) {
          SSL_SESSION *sess;
          BIO *stmp = BIO_new_file(sess_in, "r");
          if (stmp == NULL) {
              BIO_printf(bio_err, "Can't open session file %s\n", sess_in);
              ERR_print_errors(bio_err);
              goto end;
          }
          sess = PEM_read_bio_SSL_SESSION(stmp, NULL, 0, NULL);
          BIO_free(stmp);
          if (sess == NULL) {
              BIO_printf(bio_err, "Can't open session file %s\n", sess_in);
              ERR_print_errors(bio_err);
              goto end;
          }
          if (!SSL_set_session(con, sess)) {
              BIO_printf(bio_err, "Can't set session\n");
              ERR_print_errors(bio_err);
              goto end;
          }
  
          SSL_SESSION_free(sess);
      }
  
      if (fallback_scsv)
          SSL_set_mode(con, SSL_MODE_SEND_FALLBACK_SCSV);
  
      if (!noservername && (servername != NULL || dane_tlsa_domain == NULL)) {
          if (servername == NULL) {
              if(host == NULL || is_dNS_name(host))
                  servername = (host == NULL) ? "localhost" : host;
          }
          if (servername != NULL && !SSL_set_tlsext_host_name(con, servername)) {
              BIO_printf(bio_err, "Unable to set TLS servername extension.\n");
              ERR_print_errors(bio_err);
              goto end;
          }
      }
  
      if (dane_tlsa_domain != NULL) {
          if (SSL_dane_enable(con, dane_tlsa_domain) <= 0) {
              BIO_printf(bio_err, "%s: Error enabling DANE TLSA "
                         "authentication.\n", prog);
              ERR_print_errors(bio_err);
              goto end;
          }
          if (dane_tlsa_rrset == NULL) {
              BIO_printf(bio_err, "%s: DANE TLSA authentication requires at "
                         "least one -dane_tlsa_rrdata option.\n", prog);
              goto end;
          }
          if (tlsa_import_rrset(con, dane_tlsa_rrset) <= 0) {
              BIO_printf(bio_err, "%s: Failed to import any TLSA "
                         "records.\n", prog);
              goto end;
          }
          if (dane_ee_no_name)
              SSL_dane_set_flags(con, DANE_FLAG_NO_DANE_EE_NAMECHECKS);
      } else if (dane_tlsa_rrset != NULL) {
          BIO_printf(bio_err, "%s: DANE TLSA authentication requires the "
                     "-dane_tlsa_domain option.\n", prog);
          goto end;
      }
  
   re_start:
      if (init_client(&sock, host, port, bindhost, bindport, socket_family,
                      socket_type, protocol) == 0) {
          BIO_printf(bio_err, "connect:errno=%d\n", get_last_socket_error());
          BIO_closesocket(sock);
          goto end;
      }
      BIO_printf(bio_c_out, "CONNECTED(%08X)\n", sock);
  
      if (c_nbio) {
          if (!BIO_socket_nbio(sock, 1)) {
              ERR_print_errors(bio_err);
              goto end;
          }
          BIO_printf(bio_c_out, "Turned on non blocking io\n");
      }
  #ifndef OPENSSL_NO_DTLS
      if (isdtls) {
          union BIO_sock_info_u peer_info;
  
  #ifndef OPENSSL_NO_SCTP
          if (protocol == IPPROTO_SCTP)
              sbio = BIO_new_dgram_sctp(sock, BIO_NOCLOSE);
          else
  #endif
              sbio = BIO_new_dgram(sock, BIO_NOCLOSE);
  
          if ((peer_info.addr = BIO_ADDR_new()) == NULL) {
              BIO_printf(bio_err, "memory allocation failure\n");
              BIO_closesocket(sock);
              goto end;
          }
          if (!BIO_sock_info(sock, BIO_SOCK_INFO_ADDRESS, &peer_info)) {
              BIO_printf(bio_err, "getsockname:errno=%d\n",
                         get_last_socket_error());
              BIO_ADDR_free(peer_info.addr);
              BIO_closesocket(sock);
              goto end;
          }
  
          (void)BIO_ctrl_set_connected(sbio, peer_info.addr);
          BIO_ADDR_free(peer_info.addr);
          peer_info.addr = NULL;
  
          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));
                  BIO_free(sbio);
                  goto shut;
              }
              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");
                  BIO_free(sbio);
                  goto shut;
              }
          } else {
              /* want to do MTU discovery */
              BIO_ctrl(sbio, BIO_CTRL_DGRAM_MTU_DISCOVER, 0, NULL);
          }
      } else
  #endif /* OPENSSL_NO_DTLS */
          sbio = BIO_new_socket(sock, BIO_NOCLOSE);
  
      if (nbio_test) {
          BIO *test;
  
          test = BIO_new(BIO_f_nbio_test());
          sbio = BIO_push(test, sbio);
      }
  
      if (c_debug) {
          BIO_set_callback(sbio, bio_dump_callback);
          BIO_set_callback_arg(sbio, (char *)bio_c_out);
      }
      if (c_msg) {
  #ifndef OPENSSL_NO_SSL_TRACE
          if (c_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_c_msg ? bio_c_msg : bio_c_out);
      }
  
      if (c_tlsextdebug) {
          SSL_set_tlsext_debug_callback(con, tlsext_cb);
          SSL_set_tlsext_debug_arg(con, bio_c_out);
      }
  #ifndef OPENSSL_NO_OCSP
      if (c_status_req) {
          SSL_set_tlsext_status_type(con, TLSEXT_STATUSTYPE_ocsp);
          SSL_CTX_set_tlsext_status_cb(ctx, ocsp_resp_cb);
          SSL_CTX_set_tlsext_status_arg(ctx, bio_c_out);
      }
  #endif
  
      SSL_set_bio(con, sbio, sbio);
      SSL_set_connect_state(con);
  
      /* ok, lets connect */
      if (fileno_stdin() > SSL_get_fd(con))
          width = fileno_stdin() + 1;
      else
          width = SSL_get_fd(con) + 1;
  
      read_tty = 1;
      write_tty = 0;
      tty_on = 0;
      read_ssl = 1;
      write_ssl = 1;
  
      cbuf_len = 0;
      cbuf_off = 0;
      sbuf_len = 0;
      sbuf_off = 0;
  
      switch ((PROTOCOL_CHOICE) starttls_proto) {
      case PROTO_OFF:
          break;
      case PROTO_LMTP:
      case PROTO_SMTP:
          {
              /*
               * This is an ugly hack that does a lot of assumptions. We do
               * have to handle multi-line responses which may come in a single
               * packet or not. We therefore have to use BIO_gets() which does
               * need a buffering BIO. So during the initial chitchat we do
               * push a buffering BIO into the chain that is removed again
               * later on to not disturb the rest of the s_client operation.
               */
              int foundit = 0;
              BIO *fbio = BIO_new(BIO_f_buffer());
  
              BIO_push(fbio, sbio);
              /* Wait for multi-line response to end from LMTP or SMTP */
              do {
                  mbuf_len = BIO_gets(fbio, mbuf, BUFSIZZ);
              } while (mbuf_len > 3 && mbuf[3] == '-');
              if (protohost == NULL)
                  protohost = "mail.example.com";
              if (starttls_proto == (int)PROTO_LMTP)
                  BIO_printf(fbio, "LHLO %s\r\n", protohost);
              else
                  BIO_printf(fbio, "EHLO %s\r\n", protohost);
              (void)BIO_flush(fbio);
              /*
               * Wait for multi-line response to end LHLO LMTP or EHLO SMTP
               * response.
               */
              do {
                  mbuf_len = BIO_gets(fbio, mbuf, BUFSIZZ);
                  if (strstr(mbuf, "STARTTLS"))
                      foundit = 1;
              } while (mbuf_len > 3 && mbuf[3] == '-');
              (void)BIO_flush(fbio);
              BIO_pop(fbio);
              BIO_free(fbio);
              if (!foundit)
                  BIO_printf(bio_err,
                             "Didn't find STARTTLS in server response,"
                             " trying anyway...\n");
              BIO_printf(sbio, "STARTTLS\r\n");
              BIO_read(sbio, sbuf, BUFSIZZ);
          }
          break;
      case PROTO_POP3:
          {
              BIO_read(sbio, mbuf, BUFSIZZ);
              BIO_printf(sbio, "STLS\r\n");
              mbuf_len = BIO_read(sbio, sbuf, BUFSIZZ);
              if (mbuf_len < 0) {
                  BIO_printf(bio_err, "BIO_read failed\n");
                  goto end;
              }
          }
          break;
      case PROTO_IMAP:
          {
              int foundit = 0;
              BIO *fbio = BIO_new(BIO_f_buffer());
  
              BIO_push(fbio, sbio);
              BIO_gets(fbio, mbuf, BUFSIZZ);
              /* STARTTLS command requires CAPABILITY... */
              BIO_printf(fbio, ". CAPABILITY\r\n");
              (void)BIO_flush(fbio);
              /* wait for multi-line CAPABILITY response */
              do {
                  mbuf_len = BIO_gets(fbio, mbuf, BUFSIZZ);
                  if (strstr(mbuf, "STARTTLS"))
                      foundit = 1;
              }
              while (mbuf_len > 3 && mbuf[0] != '.');
              (void)BIO_flush(fbio);
              BIO_pop(fbio);
              BIO_free(fbio);
              if (!foundit)
                  BIO_printf(bio_err,
                             "Didn't find STARTTLS in server response,"
                             " trying anyway...\n");
              BIO_printf(sbio, ". STARTTLS\r\n");
              BIO_read(sbio, sbuf, BUFSIZZ);
          }
          break;
      case PROTO_FTP:
          {
              BIO *fbio = BIO_new(BIO_f_buffer());
  
              BIO_push(fbio, sbio);
              /* wait for multi-line response to end from FTP */
              do {
                  mbuf_len = BIO_gets(fbio, mbuf, BUFSIZZ);
              }
              while (mbuf_len > 3 && (!isdigit(mbuf[0]) || !isdigit(mbuf[1]) || !isdigit(mbuf[2]) || mbuf[3] != ' '));
              (void)BIO_flush(fbio);
              BIO_pop(fbio);
              BIO_free(fbio);
              BIO_printf(sbio, "AUTH TLS\r\n");
              BIO_read(sbio, sbuf, BUFSIZZ);
          }
          break;
      case PROTO_XMPP:
      case PROTO_XMPP_SERVER:
          {
              int seen = 0;
              BIO_printf(sbio, "<stream:stream "
                         "xmlns:stream='http://etherx.jabber.org/streams' "
                         "xmlns='jabber:%s' to='%s' version='1.0'>",
                         starttls_proto == PROTO_XMPP ? "client" : "server",
                         protohost ? protohost : host);
              seen = BIO_read(sbio, mbuf, BUFSIZZ);
              if (seen < 0) {
                  BIO_printf(bio_err, "BIO_read failed\n");
                  goto end;
              }
              mbuf[seen] = '\0';
              while (!strstr
                     (mbuf, "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'")
                     && !strstr(mbuf,
                                "<starttls xmlns=\"urn:ietf:params:xml:ns:xmpp-tls\""))
              {
                  seen = BIO_read(sbio, mbuf, BUFSIZZ);
  
                  if (seen <= 0)
                      goto shut;
  
                  mbuf[seen] = '\0';
              }
              BIO_printf(sbio,
                         "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
              seen = BIO_read(sbio, sbuf, BUFSIZZ);
              if (seen < 0) {
                  BIO_printf(bio_err, "BIO_read failed\n");
                  goto shut;
              }
              sbuf[seen] = '\0';
              if (!strstr(sbuf, "<proceed"))
                  goto shut;
              mbuf[0] = '\0';
          }
          break;
      case PROTO_TELNET:
          {
              static const unsigned char tls_do[] = {
                  /* IAC    DO   START_TLS */
                     255,   253, 46
              };
              static const unsigned char tls_will[] = {
                  /* IAC  WILL START_TLS */
                     255, 251, 46
              };
              static const unsigned char tls_follows[] = {
                  /* IAC  SB   START_TLS FOLLOWS IAC  SE */
                     255, 250, 46,       1,      255, 240
              };
              int bytes;
  
              /* Telnet server should demand we issue START_TLS */
              bytes = BIO_read(sbio, mbuf, BUFSIZZ);
              if (bytes != 3 || memcmp(mbuf, tls_do, 3) != 0)
                  goto shut;
              /* Agree to issue START_TLS and send the FOLLOWS sub-command */
              BIO_write(sbio, tls_will, 3);
              BIO_write(sbio, tls_follows, 6);
              (void)BIO_flush(sbio);
              /* Telnet server also sent the FOLLOWS sub-command */
              bytes = BIO_read(sbio, mbuf, BUFSIZZ);
              if (bytes != 6 || memcmp(mbuf, tls_follows, 6) != 0)
                  goto shut;
          }
          break;
      case PROTO_CONNECT:
          if (!OSSL_HTTP_proxy_connect(sbio, host, port, proxyuser, proxypass,
                                       0 /* no timeout */, bio_err, prog))
              goto shut;
          break;
      case PROTO_IRC:
          {
              int numeric;
              BIO *fbio = BIO_new(BIO_f_buffer());
  
              BIO_push(fbio, sbio);
              BIO_printf(fbio, "STARTTLS\r\n");
              (void)BIO_flush(fbio);
              width = SSL_get_fd(con) + 1;
  
              do {
                  numeric = 0;
  
                  FD_ZERO(&readfds);
                  openssl_fdset(SSL_get_fd(con), &readfds);
                  timeout.tv_sec = S_CLIENT_IRC_READ_TIMEOUT;
                  timeout.tv_usec = 0;
                  /*
                   * If the IRCd doesn't respond within
                   * S_CLIENT_IRC_READ_TIMEOUT seconds, assume
                   * it doesn't support STARTTLS. Many IRCds
                   * will not give _any_ sort of response to a
                   * STARTTLS command when it's not supported.
                   */
                  if (!BIO_get_buffer_num_lines(fbio)
                      && !BIO_pending(fbio)
                      && !BIO_pending(sbio)
                      && select(width, (void *)&readfds, NULL, NULL,
                                &timeout) < 1) {
                      BIO_printf(bio_err,
                                 "Timeout waiting for response (%d seconds).\n",
                                 S_CLIENT_IRC_READ_TIMEOUT);
                      break;
                  }
  
                  mbuf_len = BIO_gets(fbio, mbuf, BUFSIZZ);
                  if (mbuf_len < 1 || sscanf(mbuf, "%*s %d", &numeric) != 1)
                      break;
                  /* :example.net 451 STARTTLS :You have not registered */
                  /* :example.net 421 STARTTLS :Unknown command */
                  if ((numeric == 451 || numeric == 421)
                      && strstr(mbuf, "STARTTLS") != NULL) {
                      BIO_printf(bio_err, "STARTTLS not supported: %s", mbuf);
                      break;
                  }
                  if (numeric == 691) {
                      BIO_printf(bio_err, "STARTTLS negotiation failed: ");
                      ERR_print_errors(bio_err);
                      break;
                  }
              } while (numeric != 670);
  
              (void)BIO_flush(fbio);
              BIO_pop(fbio);
              BIO_free(fbio);
              if (numeric != 670) {
                  BIO_printf(bio_err, "Server does not support STARTTLS.\n");
                  ret = 1;
                  goto shut;
              }
          }
          break;
      case PROTO_MYSQL:
          {
              /* SSL request packet */
              static const unsigned char ssl_req[] = {
                  /* payload_length,   sequence_id */
                     0x20, 0x00, 0x00, 0x01,
                  /* payload */
                  /* capability flags, CLIENT_SSL always set */
                     0x85, 0xae, 0x7f, 0x00,
                  /* max-packet size */
                     0x00, 0x00, 0x00, 0x01,
                  /* character set */
                     0x21,
                  /* string[23] reserved (all [0]) */
                     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
              };
              int bytes = 0;
              int ssl_flg = 0x800;
              int pos;
              const unsigned char *packet = (const unsigned char *)sbuf;
  
              /* Receiving Initial Handshake packet. */
              bytes = BIO_read(sbio, (void *)packet, BUFSIZZ);
              if (bytes < 0) {
                  BIO_printf(bio_err, "BIO_read failed\n");
                  goto shut;
              /* Packet length[3], Packet number[1] + minimum payload[17] */
              } else if (bytes < 21) {
                  BIO_printf(bio_err, "MySQL packet too short.\n");
                  goto shut;
              } else if (bytes != (4 + packet[0] +
                                   (packet[1] << 8) +
                                   (packet[2] << 16))) {
                  BIO_printf(bio_err, "MySQL packet length does not match.\n");
                  goto shut;
              /* protocol version[1] */
              } else if (packet[4] != 0xA) {
                  BIO_printf(bio_err,
                             "Only MySQL protocol version 10 is supported.\n");
                  goto shut;
              }
  
              pos = 5;
              /* server version[string+NULL] */
              for (;;) {
                  if (pos >= bytes) {
                      BIO_printf(bio_err, "Cannot confirm server version. ");
                      goto shut;
                  } else if (packet[pos++] == '\0') {
                      break;
                  }
              }
  
              /* make sure we have at least 15 bytes left in the packet */
              if (pos + 15 > bytes) {
                  BIO_printf(bio_err,
                             "MySQL server handshake packet is broken.\n");
                  goto shut;
              }
  
              pos += 12; /* skip over conn id[4] + SALT[8] */
              if (packet[pos++] != '\0') { /* verify filler */
                  BIO_printf(bio_err,
                             "MySQL packet is broken.\n");
                  goto shut;
              }
  
              /* capability flags[2] */
              if (!((packet[pos] + (packet[pos + 1] << 8)) & ssl_flg)) {
                  BIO_printf(bio_err, "MySQL server does not support SSL.\n");
                  goto shut;
              }
  
              /* Sending SSL Handshake packet. */
              BIO_write(sbio, ssl_req, sizeof(ssl_req));
              (void)BIO_flush(sbio);
          }
          break;
      case PROTO_POSTGRES:
          {
              static const unsigned char ssl_request[] = {
                  /* Length        SSLRequest */
                     0, 0, 0, 8,   4, 210, 22, 47
              };
              int bytes;
  
              /* Send SSLRequest packet */
              BIO_write(sbio, ssl_request, 8);
              (void)BIO_flush(sbio);
  
              /* Reply will be a single S if SSL is enabled */
              bytes = BIO_read(sbio, sbuf, BUFSIZZ);
              if (bytes != 1 || sbuf[0] != 'S')
                  goto shut;
          }
          break;
      case PROTO_NNTP:
          {
              int foundit = 0;
              BIO *fbio = BIO_new(BIO_f_buffer());
  
              BIO_push(fbio, sbio);
              BIO_gets(fbio, mbuf, BUFSIZZ);
              /* STARTTLS command requires CAPABILITIES... */
              BIO_printf(fbio, "CAPABILITIES\r\n");
              (void)BIO_flush(fbio);
              BIO_gets(fbio, mbuf, BUFSIZZ);
              /* no point in trying to parse the CAPABILITIES response if there is none */
              if (strstr(mbuf, "101") != NULL) {
                  /* wait for multi-line CAPABILITIES response */
                  do {
                      mbuf_len = BIO_gets(fbio, mbuf, BUFSIZZ);
                      if (strstr(mbuf, "STARTTLS"))
                          foundit = 1;
                  } while (mbuf_len > 1 && mbuf[0] != '.');
              }
              (void)BIO_flush(fbio);
              BIO_pop(fbio);
              BIO_free(fbio);
              if (!foundit)
                  BIO_printf(bio_err,
                             "Didn't find STARTTLS in server response,"
                             " trying anyway...\n");
              BIO_printf(sbio, "STARTTLS\r\n");
              mbuf_len = BIO_read(sbio, mbuf, BUFSIZZ);
              if (mbuf_len < 0) {
                  BIO_printf(bio_err, "BIO_read failed\n");
                  goto end;
              }
              mbuf[mbuf_len] = '\0';
              if (strstr(mbuf, "382") == NULL) {
                  BIO_printf(bio_err, "STARTTLS failed: %s", mbuf);
                  goto shut;
              }
          }
          break;
      case PROTO_SIEVE:
          {
              int foundit = 0;
              BIO *fbio = BIO_new(BIO_f_buffer());
  
              BIO_push(fbio, sbio);
              /* wait for multi-line response to end from Sieve */
              do {
                  mbuf_len = BIO_gets(fbio, mbuf, BUFSIZZ);
                  /*
                   * According to RFC 5804 § 1.7, capability
                   * is case-insensitive, make it uppercase
                   */
                  if (mbuf_len > 1 && mbuf[0] == '"') {
                      make_uppercase(mbuf);
                      if (strncmp(mbuf, "\"STARTTLS\"", 10) == 0)
                          foundit = 1;
                  }
              } while (mbuf_len > 1 && mbuf[0] == '"');
              (void)BIO_flush(fbio);
              BIO_pop(fbio);
              BIO_free(fbio);
              if (!foundit)
                  BIO_printf(bio_err,
                             "Didn't find STARTTLS in server response,"
                             " trying anyway...\n");
              BIO_printf(sbio, "STARTTLS\r\n");
              mbuf_len = BIO_read(sbio, mbuf, BUFSIZZ);
              if (mbuf_len < 0) {
                  BIO_printf(bio_err, "BIO_read failed\n");
                  goto end;
              }
              mbuf[mbuf_len] = '\0';
              if (mbuf_len < 2) {
                  BIO_printf(bio_err, "STARTTLS failed: %s", mbuf);
                  goto shut;
              }
              /*
               * According to RFC 5804 § 2.2, response codes are case-
               * insensitive, make it uppercase but preserve the response.
               */
              strncpy(sbuf, mbuf, 2);
              make_uppercase(sbuf);
              if (strncmp(sbuf, "OK", 2) != 0) {
                  BIO_printf(bio_err, "STARTTLS not supported: %s", mbuf);
                  goto shut;
              }
          }
          break;
      case PROTO_LDAP:
          {
              /* StartTLS Operation according to RFC 4511 */
              static char ldap_tls_genconf[] = "asn1=SEQUENCE:LDAPMessage\n"
                  "[LDAPMessage]\n"
                  "messageID=INTEGER:1\n"
                  "extendedReq=EXPLICIT:23A,IMPLICIT:0C,"
                  "FORMAT:ASCII,OCT:1.3.6.1.4.1.1466.20037\n";
              long errline = -1;
              char *genstr = NULL;
              int result = -1;
              ASN1_TYPE *atyp = NULL;
              BIO *ldapbio = BIO_new(BIO_s_mem());
              CONF *cnf = NCONF_new(NULL);
  
              if (cnf == NULL) {
                  BIO_free(ldapbio);
                  goto end;
              }
              BIO_puts(ldapbio, ldap_tls_genconf);
              if (NCONF_load_bio(cnf, ldapbio, &errline) <= 0) {
                  BIO_free(ldapbio);
                  NCONF_free(cnf);
                  if (errline <= 0) {
                      BIO_printf(bio_err, "NCONF_load_bio failed\n");
                      goto end;
                  } else {
                      BIO_printf(bio_err, "Error on line %ld\n", errline);
                      goto end;
                  }
              }
              BIO_free(ldapbio);
              genstr = NCONF_get_string(cnf, "default", "asn1");
              if (genstr == NULL) {
                  NCONF_free(cnf);
                  BIO_printf(bio_err, "NCONF_get_string failed\n");
                  goto end;
              }
              atyp = ASN1_generate_nconf(genstr, cnf);
              if (atyp == NULL) {
                  NCONF_free(cnf);
                  BIO_printf(bio_err, "ASN1_generate_nconf failed\n");
                  goto end;
              }
              NCONF_free(cnf);
  
              /* Send SSLRequest packet */
              BIO_write(sbio, atyp->value.sequence->data,
                        atyp->value.sequence->length);
              (void)BIO_flush(sbio);
              ASN1_TYPE_free(atyp);
  
              mbuf_len = BIO_read(sbio, mbuf, BUFSIZZ);
              if (mbuf_len < 0) {
                  BIO_printf(bio_err, "BIO_read failed\n");
                  goto end;
              }
              result = ldap_ExtendedResponse_parse(mbuf, mbuf_len);
              if (result < 0) {
                  BIO_printf(bio_err, "ldap_ExtendedResponse_parse failed\n");
                  goto shut;
              } else if (result > 0) {
                  BIO_printf(bio_err, "STARTTLS failed, LDAP Result Code: %i\n",
                             result);
                  goto shut;
              }
              mbuf_len = 0;
          }
          break;
      }
  
      if (early_data_file != NULL
              && ((SSL_get0_session(con) != NULL
                   && SSL_SESSION_get_max_early_data(SSL_get0_session(con)) > 0)
                  || (psksess != NULL
                      && SSL_SESSION_get_max_early_data(psksess) > 0))) {
          BIO *edfile = BIO_new_file(early_data_file, "r");
          size_t readbytes, writtenbytes;
          int finish = 0;
  
          if (edfile == NULL) {
              BIO_printf(bio_err, "Cannot open early data file\n");
              goto shut;
          }
  
          while (!finish) {
              if (!BIO_read_ex(edfile, cbuf, BUFSIZZ, &readbytes))
                  finish = 1;
  
              while (!SSL_write_early_data(con, cbuf, readbytes, &writtenbytes)) {
                  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 writing early data\n");
                      BIO_free(edfile);
                      ERR_print_errors(bio_err);
                      goto shut;
                  }
              }
          }
  
          BIO_free(edfile);
      }
  
      for (;;) {
          FD_ZERO(&readfds);
          FD_ZERO(&writefds);
  
          if (SSL_is_dtls(con) && DTLSv1_get_timeout(con, &timeout))
              timeoutp = &timeout;
          else
              timeoutp = NULL;
  
          if (!SSL_is_init_finished(con) && SSL_total_renegotiations(con) == 0
                  && SSL_get_key_update_type(con) == SSL_KEY_UPDATE_NONE) {
              in_init = 1;
              tty_on = 0;
          } else {
              tty_on = 1;
              if (in_init) {
                  in_init = 0;
  
                  if (c_brief) {
                      BIO_puts(bio_err, "CONNECTION ESTABLISHED\n");
                      print_ssl_summary(con);
                  }
  
                  print_stuff(bio_c_out, con, full_log);
                  if (full_log > 0)
                      full_log--;
  
                  if (starttls_proto) {
                      BIO_write(bio_err, mbuf, mbuf_len);
                      /* We don't need to know any more */
                      if (!reconnect)
                          starttls_proto = PROTO_OFF;
                  }
  
                  if (reconnect) {
                      reconnect--;
                      BIO_printf(bio_c_out,
                                 "drop connection and then reconnect\n");
                      do_ssl_shutdown(con);
                      SSL_set_connect_state(con);
                      BIO_closesocket(SSL_get_fd(con));
                      goto re_start;
                  }
              }
          }
  
          ssl_pending = read_ssl && SSL_has_pending(con);
  
          if (!ssl_pending) {
  #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_MSDOS)
              if (tty_on) {
                  /*
                   * Note that select() returns when read _would not block_,
                   * and EOF satisfies that.  To avoid a CPU-hogging loop,
                   * set the flag so we exit.
                   */
                  if (read_tty && !at_eof)
                      openssl_fdset(fileno_stdin(), &readfds);
  #if !defined(OPENSSL_SYS_VMS)
                  if (write_tty)
                      openssl_fdset(fileno_stdout(), &writefds);
  #endif
              }
              if (read_ssl)
                  openssl_fdset(SSL_get_fd(con), &readfds);
              if (write_ssl)
                  openssl_fdset(SSL_get_fd(con), &writefds);
  #else
              if (!tty_on || !write_tty) {
                  if (read_ssl)
                      openssl_fdset(SSL_get_fd(con), &readfds);
                  if (write_ssl)
                      openssl_fdset(SSL_get_fd(con), &writefds);
              }
  #endif
  
              /*
               * 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 Windows/DOS we make the assumption that we can always
               * write to the tty: therefore if we need to write to the tty we
               * just fall through. Otherwise we timeout the select every
               * second and see if there are any keypresses. Note: this is a
               * hack, in a proper Windows application we wouldn't do this.
               */
              i = 0;
              if (!write_tty) {
                  if (read_tty) {
                      tv.tv_sec = 1;
                      tv.tv_usec = 0;
                      i = select(width, (void *)&readfds, (void *)&writefds,
                                 NULL, &tv);
                      if (!i && (!has_stdin_waiting() || !read_tty))
                          continue;
                  } else
                      i = select(width, (void *)&readfds, (void *)&writefds,
                                 NULL, timeoutp);
              }
  #else
              i = select(width, (void *)&readfds, (void *)&writefds,
                         NULL, timeoutp);
  #endif
              if (i < 0) {
                  BIO_printf(bio_err, "bad select %d\n",
                             get_last_socket_error());
                  goto shut;
              }
          }
  
          if (SSL_is_dtls(con) && DTLSv1_handle_timeout(con) > 0)
              BIO_printf(bio_err, "TIMEOUT occurred\n");
  
          if (!ssl_pending && FD_ISSET(SSL_get_fd(con), &writefds)) {
              k = SSL_write(con, &(cbuf[cbuf_off]), (unsigned int)cbuf_len);
              switch (SSL_get_error(con, k)) {
              case SSL_ERROR_NONE:
                  cbuf_off += k;
                  cbuf_len -= k;
                  if (k <= 0)
                      goto end;
                  /* we have done a  write(con,NULL,0); */
                  if (cbuf_len <= 0) {
                      read_tty = 1;
                      write_ssl = 0;
                  } else {        /* if (cbuf_len > 0) */
  
                      read_tty = 0;
                      write_ssl = 1;
                  }
                  break;
              case SSL_ERROR_WANT_WRITE:
                  BIO_printf(bio_c_out, "write W BLOCK\n");
                  write_ssl = 1;
                  read_tty = 0;
                  break;
              case SSL_ERROR_WANT_ASYNC:
                  BIO_printf(bio_c_out, "write A BLOCK\n");
                  wait_for_async(con);
                  write_ssl = 1;
                  read_tty = 0;
                  break;
              case SSL_ERROR_WANT_READ:
                  BIO_printf(bio_c_out, "write R BLOCK\n");
                  write_tty = 0;
                  read_ssl = 1;
                  write_ssl = 0;
                  break;
              case SSL_ERROR_WANT_X509_LOOKUP:
                  BIO_printf(bio_c_out, "write X BLOCK\n");
                  break;
              case SSL_ERROR_ZERO_RETURN:
                  if (cbuf_len != 0) {
                      BIO_printf(bio_c_out, "shutdown\n");
                      ret = 0;
                      goto shut;
                  } else {
                      read_tty = 1;
                      write_ssl = 0;
                      break;
                  }
  
              case SSL_ERROR_SYSCALL:
                  if ((k != 0) || (cbuf_len != 0)) {
                      BIO_printf(bio_err, "write:errno=%d\n",
                                 get_last_socket_error());
                      goto shut;
                  } else {
                      read_tty = 1;
                      write_ssl = 0;
                  }
                  break;
              case SSL_ERROR_WANT_ASYNC_JOB:
                  /* This shouldn't ever happen in s_client - treat as an error */
              case SSL_ERROR_SSL:
                  ERR_print_errors(bio_err);
                  goto shut;
              }
          }
  #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VMS)
          /* Assume Windows/DOS/BeOS can always write */
          else if (!ssl_pending && write_tty)
  #else
          else if (!ssl_pending && FD_ISSET(fileno_stdout(), &writefds))
  #endif
          {
  #ifdef CHARSET_EBCDIC
              ascii2ebcdic(&(sbuf[sbuf_off]), &(sbuf[sbuf_off]), sbuf_len);
  #endif
              i = raw_write_stdout(&(sbuf[sbuf_off]), sbuf_len);
  
              if (i <= 0) {
                  BIO_printf(bio_c_out, "DONE\n");
                  ret = 0;
                  goto shut;
              }
  
              sbuf_len -= i;
              sbuf_off += i;
              if (sbuf_len <= 0) {
                  read_ssl = 1;
                  write_tty = 0;
              }
          } else if (ssl_pending || FD_ISSET(SSL_get_fd(con), &readfds)) {
  #ifdef RENEG
              {
                  static int iiii;
                  if (++iiii == 52) {
                      SSL_renegotiate(con);
                      iiii = 0;
                  }
              }
  #endif
              k = SSL_read(con, sbuf, 1024 /* BUFSIZZ */ );
  
              switch (SSL_get_error(con, k)) {
              case SSL_ERROR_NONE:
                  if (k <= 0)
                      goto end;
                  sbuf_off = 0;
                  sbuf_len = k;
  
                  read_ssl = 0;
                  write_tty = 1;
                  break;
              case SSL_ERROR_WANT_ASYNC:
                  BIO_printf(bio_c_out, "read A BLOCK\n");
                  wait_for_async(con);
                  write_tty = 0;
                  read_ssl = 1;
                  if ((read_tty == 0) && (write_ssl == 0))
                      write_ssl = 1;
                  break;
              case SSL_ERROR_WANT_WRITE:
                  BIO_printf(bio_c_out, "read W BLOCK\n");
                  write_ssl = 1;
                  read_tty = 0;
                  break;
              case SSL_ERROR_WANT_READ:
                  BIO_printf(bio_c_out, "read R BLOCK\n");
                  write_tty = 0;
                  read_ssl = 1;
                  if ((read_tty == 0) && (write_ssl == 0))
                      write_ssl = 1;
                  break;
              case SSL_ERROR_WANT_X509_LOOKUP:
                  BIO_printf(bio_c_out, "read X BLOCK\n");
                  break;
              case SSL_ERROR_SYSCALL:
                  ret = get_last_socket_error();
                  if (c_brief)
                      BIO_puts(bio_err, "CONNECTION CLOSED BY SERVER\n");
                  else
                      BIO_printf(bio_err, "read:errno=%d\n", ret);
                  goto shut;
              case SSL_ERROR_ZERO_RETURN:
                  BIO_printf(bio_c_out, "closed\n");
                  ret = 0;
                  goto shut;
              case SSL_ERROR_WANT_ASYNC_JOB:
                  /* This shouldn't ever happen in s_client. Treat as an error */
              case SSL_ERROR_SSL:
                  ERR_print_errors(bio_err);
                  goto shut;
              }
          }
  /* OPENSSL_SYS_MSDOS includes OPENSSL_SYS_WINDOWS */
  #if defined(OPENSSL_SYS_MSDOS)
          else if (has_stdin_waiting())
  #else
          else if (FD_ISSET(fileno_stdin(), &readfds))
  #endif
          {
              if (crlf) {
                  int j, lf_num;
  
                  i = raw_read_stdin(cbuf, BUFSIZZ / 2);
                  lf_num = 0;
                  /* both loops are skipped when i <= 0 */
                  for (j = 0; j < i; j++)
                      if (cbuf[j] == '\n')
                          lf_num++;
                  for (j = i - 1; j >= 0; j--) {
                      cbuf[j + lf_num] = cbuf[j];
                      if (cbuf[j] == '\n') {
                          lf_num--;
                          i++;
                          cbuf[j + lf_num] = '\r';
                      }
                  }
                  assert(lf_num == 0);
              } else
                  i = raw_read_stdin(cbuf, BUFSIZZ);
  #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_MSDOS)
              if (i == 0)
                  at_eof = 1;
  #endif
  
              if ((!c_ign_eof) && ((i <= 0) || (cbuf[0] == 'Q' && cmdletters))) {
                  BIO_printf(bio_err, "DONE\n");
                  ret = 0;
                  goto shut;
              }
  
              if ((!c_ign_eof) && (cbuf[0] == 'R' && cmdletters)) {
                  BIO_printf(bio_err, "RENEGOTIATING\n");
                  SSL_renegotiate(con);
                  cbuf_len = 0;
              } else if (!c_ign_eof && (cbuf[0] == 'K' || cbuf[0] == 'k' )
                      && cmdletters) {
                  BIO_printf(bio_err, "KEYUPDATE\n");
                  SSL_key_update(con,
                                 cbuf[0] == 'K' ? SSL_KEY_UPDATE_REQUESTED
                                                : SSL_KEY_UPDATE_NOT_REQUESTED);
                  cbuf_len = 0;
              } else {
                  cbuf_len = i;
                  cbuf_off = 0;
  #ifdef CHARSET_EBCDIC
                  ebcdic2ascii(cbuf, cbuf, i);
  #endif
              }
  
              write_ssl = 1;
              read_tty = 0;
          }
      }
  
      ret = 0;
   shut:
      if (in_init)
          print_stuff(bio_c_out, con, full_log);
      do_ssl_shutdown(con);
  
      /*
       * If we ended with an alert being sent, but still with data in the
       * network buffer to be read, then calling BIO_closesocket() will
       * result in a TCP-RST being sent. On some platforms (notably
       * Windows) then this will result in the peer immediately abandoning
       * the connection including any buffered alert data before it has
       * had a chance to be read. Shutting down the sending side first,
       * and then closing the socket sends TCP-FIN first followed by
       * TCP-RST. This seems to allow the peer to read the alert data.
       */
      shutdown(SSL_get_fd(con), 1); /* SHUT_WR */
      /*
       * We just said we have nothing else to say, but it doesn't mean that
       * the other side has nothing. It's even recommended to consume incoming
       * data. [In testing context this ensures that alerts are passed on...]
       */
      timeout.tv_sec = 0;
      timeout.tv_usec = 500000;  /* some extreme round-trip */
      do {
          FD_ZERO(&readfds);
          openssl_fdset(sock, &readfds);
      } while (select(sock + 1, &readfds, NULL, NULL, &timeout) > 0
               && BIO_read(sbio, sbuf, BUFSIZZ) > 0);
  
      BIO_closesocket(SSL_get_fd(con));
   end:
      if (con != NULL) {
          if (prexit != 0)
              print_stuff(bio_c_out, con, 1);
          SSL_free(con);
      }
      SSL_SESSION_free(psksess);
  #if !defined(OPENSSL_NO_NEXTPROTONEG)
      OPENSSL_free(next_proto.data);
  #endif
      SSL_CTX_free(ctx);
      set_keylog_file(NULL, NULL);
      X509_free(cert);
      sk_X509_CRL_pop_free(crls, X509_CRL_free);
      EVP_PKEY_free(key);
      sk_X509_pop_free(chain, X509_free);
      OPENSSL_free(pass);
  #ifndef OPENSSL_NO_SRP
      OPENSSL_free(srp_arg.srppassin);
  #endif
      OPENSSL_free(connectstr);
      OPENSSL_free(bindstr);
      OPENSSL_free(host);
      OPENSSL_free(port);
      X509_VERIFY_PARAM_free(vpm);
      ssl_excert_free(exc);
      sk_OPENSSL_STRING_free(ssl_args);
      sk_OPENSSL_STRING_free(dane_tlsa_rrset);
      SSL_CONF_CTX_free(cctx);
      OPENSSL_clear_free(cbuf, BUFSIZZ);
      OPENSSL_clear_free(sbuf, BUFSIZZ);
      OPENSSL_clear_free(mbuf, BUFSIZZ);
      if (proxypass != NULL)
          OPENSSL_clear_free(proxypass, strlen(proxypass));
      release_engine(e);
      BIO_free(bio_c_out);
      bio_c_out = NULL;
      BIO_free(bio_c_msg);
      bio_c_msg = NULL;
      return ret;
  }
  
  static void print_stuff(BIO *bio, SSL *s, int full)
  {
      X509 *peer = NULL;
      STACK_OF(X509) *sk;
      const SSL_CIPHER *c;
      int i, istls13 = (SSL_version(s) == TLS1_3_VERSION);
      long verify_result;
  #ifndef OPENSSL_NO_COMP
      const COMP_METHOD *comp, *expansion;
  #endif
      unsigned char *exportedkeymat;
  #ifndef OPENSSL_NO_CT
      const SSL_CTX *ctx = SSL_get_SSL_CTX(s);
  #endif
  
      if (full) {
          int got_a_chain = 0;
  
          sk = SSL_get_peer_cert_chain(s);
          if (sk != NULL) {
              got_a_chain = 1;
  
              BIO_printf(bio, "---\nCertificate chain\n");
              for (i = 0; i < sk_X509_num(sk); i++) {
                  BIO_printf(bio, "%2d s:", i);
                  X509_NAME_print_ex(bio, X509_get_subject_name(sk_X509_value(sk, i)), 0, get_nameopt());
                  BIO_puts(bio, "\n");
                  BIO_printf(bio, "   i:");
                  X509_NAME_print_ex(bio, X509_get_issuer_name(sk_X509_value(sk, i)), 0, get_nameopt());
                  BIO_puts(bio, "\n");
                  if (c_showcerts)
                      PEM_write_bio_X509(bio, sk_X509_value(sk, i));
              }
          }
  
          BIO_printf(bio, "---\n");
          peer = SSL_get_peer_certificate(s);
          if (peer != NULL) {
              BIO_printf(bio, "Server certificate\n");
  
              /* Redundant if we showed the whole chain */
              if (!(c_showcerts && got_a_chain))
                  PEM_write_bio_X509(bio, peer);
              dump_cert_text(bio, peer);
          } else {
              BIO_printf(bio, "no peer certificate available\n");
          }
          print_ca_names(bio, s);
  
          ssl_print_sigalgs(bio, s);
          ssl_print_tmp_key(bio, s);
  
  #ifndef OPENSSL_NO_CT
          /*
           * When the SSL session is anonymous, or resumed via an abbreviated
           * handshake, no SCTs are provided as part of the handshake.  While in
           * a resumed session SCTs may be present in the session's certificate,
           * no callbacks are invoked to revalidate these, and in any case that
           * set of SCTs may be incomplete.  Thus it makes little sense to
           * attempt to display SCTs from a resumed session's certificate, and of
           * course none are associated with an anonymous peer.
           */
          if (peer != NULL && !SSL_session_reused(s) && SSL_ct_is_enabled(s)) {
              const STACK_OF(SCT) *scts = SSL_get0_peer_scts(s);
              int sct_count = scts != NULL ? sk_SCT_num(scts) : 0;
  
              BIO_printf(bio, "---\nSCTs present (%i)\n", sct_count);
              if (sct_count > 0) {
                  const CTLOG_STORE *log_store = SSL_CTX_get0_ctlog_store(ctx);
  
                  BIO_printf(bio, "---\n");
                  for (i = 0; i < sct_count; ++i) {
                      SCT *sct = sk_SCT_value(scts, i);
  
                      BIO_printf(bio, "SCT validation status: %s\n",
                                 SCT_validation_status_string(sct));
                      SCT_print(sct, bio, 0, log_store);
                      if (i < sct_count - 1)
                          BIO_printf(bio, "\n---\n");
                  }
                  BIO_printf(bio, "\n");
              }
          }
  #endif
  
          BIO_printf(bio,
                     "---\nSSL handshake has read %ju bytes "
                     "and written %ju bytes\n",
                     BIO_number_read(SSL_get_rbio(s)),
                     BIO_number_written(SSL_get_wbio(s)));
      }
      print_verify_detail(s, bio);
      BIO_printf(bio, (SSL_session_reused(s) ? "---\nReused, " : "---\nNew, "));
      c = SSL_get_current_cipher(s);
      BIO_printf(bio, "%s, Cipher is %s\n",
                 SSL_CIPHER_get_version(c), SSL_CIPHER_get_name(c));
      if (peer != NULL) {
          EVP_PKEY *pktmp;
  
          pktmp = X509_get0_pubkey(peer);
          BIO_printf(bio, "Server public key is %d bit\n",
                     EVP_PKEY_bits(pktmp));
      }
      BIO_printf(bio, "Secure Renegotiation IS%s supported\n",
                 SSL_get_secure_renegotiation_support(s) ? "" : " NOT");
  #ifndef OPENSSL_NO_COMP
      comp = SSL_get_current_compression(s);
      expansion = SSL_get_current_expansion(s);
      BIO_printf(bio, "Compression: %s\n",
                 comp ? SSL_COMP_get_name(comp) : "NONE");
      BIO_printf(bio, "Expansion: %s\n",
                 expansion ? SSL_COMP_get_name(expansion) : "NONE");
  #endif
  #ifndef OPENSSL_NO_KTLS
      if (BIO_get_ktls_send(SSL_get_wbio(s)))
          BIO_printf(bio_err, "Using Kernel TLS for sending\n");
      if (BIO_get_ktls_recv(SSL_get_rbio(s)))
          BIO_printf(bio_err, "Using Kernel TLS for receiving\n");
  #endif
  
      if (OSSL_TRACE_ENABLED(TLS)) {
          /* Print out local port of connection: useful for debugging */
          int sock;
          union BIO_sock_info_u info;
  
          sock = SSL_get_fd(s);
          if ((info.addr = BIO_ADDR_new()) != NULL
              && BIO_sock_info(sock, BIO_SOCK_INFO_ADDRESS, &info)) {
              BIO_printf(bio_c_out, "LOCAL PORT is %u\n",
                         ntohs(BIO_ADDR_rawport(info.addr)));
          }
          BIO_ADDR_free(info.addr);
      }
  
  #if !defined(OPENSSL_NO_NEXTPROTONEG)
      if (next_proto.status != -1) {
          const unsigned char *proto;
          unsigned int proto_len;
          SSL_get0_next_proto_negotiated(s, &proto, &proto_len);
          BIO_printf(bio, "Next protocol: (%d) ", next_proto.status);
          BIO_write(bio, proto, proto_len);
          BIO_write(bio, "\n", 1);
      }
  #endif
      {
          const unsigned char *proto;
          unsigned int proto_len;
          SSL_get0_alpn_selected(s, &proto, &proto_len);
          if (proto_len > 0) {
              BIO_printf(bio, "ALPN protocol: ");
              BIO_write(bio, proto, proto_len);
              BIO_write(bio, "\n", 1);
          } else
              BIO_printf(bio, "No ALPN negotiated\n");
      }
  
  #ifndef OPENSSL_NO_SRTP
      {
          SRTP_PROTECTION_PROFILE *srtp_profile =
              SSL_get_selected_srtp_profile(s);
  
          if (srtp_profile)
              BIO_printf(bio, "SRTP Extension negotiated, profile=%s\n",
                         srtp_profile->name);
      }
  #endif
  
      if (istls13) {
          switch (SSL_get_early_data_status(s)) {
          case SSL_EARLY_DATA_NOT_SENT:
              BIO_printf(bio, "Early data was not sent\n");
              break;
  
          case SSL_EARLY_DATA_REJECTED:
              BIO_printf(bio, "Early data was rejected\n");
              break;
  
          case SSL_EARLY_DATA_ACCEPTED:
              BIO_printf(bio, "Early data was accepted\n");
              break;
  
          }
  
          /*
           * We also print the verify results when we dump session information,
           * but in TLSv1.3 we may not get that right away (or at all) depending
           * on when we get a NewSessionTicket. Therefore we print it now as well.
           */
          verify_result = SSL_get_verify_result(s);
          BIO_printf(bio, "Verify return code: %ld (%s)\n", verify_result,
                     X509_verify_cert_error_string(verify_result));
      } else {
          /* In TLSv1.3 we do this on arrival of a NewSessionTicket */
          SSL_SESSION_print(bio, SSL_get_session(s));
      }
  
      if (SSL_get_session(s) != NULL && keymatexportlabel != NULL) {
          BIO_printf(bio, "Keying material exporter:\n");
          BIO_printf(bio, "    Label: '%s'\n", keymatexportlabel);
          BIO_printf(bio, "    Length: %i bytes\n", keymatexportlen);
          exportedkeymat = app_malloc(keymatexportlen, "export key");
          if (!SSL_export_keying_material(s, exportedkeymat,
                                          keymatexportlen,
                                          keymatexportlabel,
                                          strlen(keymatexportlabel),
                                          NULL, 0, 0)) {
              BIO_printf(bio, "    Error\n");
          } else {
              BIO_printf(bio, "    Keying material: ");
              for (i = 0; i < keymatexportlen; i++)
                  BIO_printf(bio, "%02X", exportedkeymat[i]);
              BIO_printf(bio, "\n");
          }
          OPENSSL_free(exportedkeymat);
      }
      BIO_printf(bio, "---\n");
      X509_free(peer);
      /* flush, or debugging output gets mixed with http response */
      (void)BIO_flush(bio);
  }
  
  # ifndef OPENSSL_NO_OCSP
  static int ocsp_resp_cb(SSL *s, void *arg)
  {
      const unsigned char *p;
      int len;
      OCSP_RESPONSE *rsp;
      len = SSL_get_tlsext_status_ocsp_resp(s, &p);
      BIO_puts(arg, "OCSP response: ");
      if (p == NULL) {
          BIO_puts(arg, "no response sent\n");
          return 1;
      }
      rsp = d2i_OCSP_RESPONSE(NULL, &p, len);
      if (rsp == NULL) {
          BIO_puts(arg, "response parse error\n");
          BIO_dump_indent(arg, (char *)p, len, 4);
          return 0;
      }
      BIO_puts(arg, "\n======================================\n");
      OCSP_RESPONSE_print(arg, rsp, 0);
      BIO_puts(arg, "======================================\n");
      OCSP_RESPONSE_free(rsp);
      return 1;
  }
  # endif
  
  static int ldap_ExtendedResponse_parse(const char *buf, long rem)
  {
      const unsigned char *cur, *end;
      long len;
      int tag, xclass, inf, ret = -1;
  
      cur = (const unsigned char *)buf;
      end = cur + rem;
  
      /*
       * From RFC 4511:
       *
       *    LDAPMessage ::= SEQUENCE {
       *         messageID       MessageID,
       *         protocolOp      CHOICE {
       *              ...
       *              extendedResp          ExtendedResponse,
       *              ... },
       *         controls       [0] Controls OPTIONAL }
       *
       *    ExtendedResponse ::= [APPLICATION 24] SEQUENCE {
       *         COMPONENTS OF LDAPResult,
       *         responseName     [10] LDAPOID OPTIONAL,
       *         responseValue    [11] OCTET STRING OPTIONAL }
       *
       *    LDAPResult ::= SEQUENCE {
       *         resultCode         ENUMERATED {
       *              success                      (0),
       *              ...
       *              other                        (80),
       *              ...  },
       *         matchedDN          LDAPDN,
       *         diagnosticMessage  LDAPString,
       *         referral           [3] Referral OPTIONAL }
       */
  
      /* pull SEQUENCE */
      inf = ASN1_get_object(&cur, &len, &tag, &xclass, rem);
      if (inf != V_ASN1_CONSTRUCTED || tag != V_ASN1_SEQUENCE ||
          (rem = end - cur, len > rem)) {
          BIO_printf(bio_err, "Unexpected LDAP response\n");
          goto end;
      }
  
      rem = len;  /* ensure that we don't overstep the SEQUENCE */
  
      /* pull MessageID */
      inf = ASN1_get_object(&cur, &len, &tag, &xclass, rem);
      if (inf != V_ASN1_UNIVERSAL || tag != V_ASN1_INTEGER ||
          (rem = end - cur, len > rem)) {
          BIO_printf(bio_err, "No MessageID\n");
          goto end;
      }
  
      cur += len; /* shall we check for MessageId match or just skip? */
  
      /* pull [APPLICATION 24] */
      rem = end - cur;
      inf = ASN1_get_object(&cur, &len, &tag, &xclass, rem);
      if (inf != V_ASN1_CONSTRUCTED || xclass != V_ASN1_APPLICATION ||
          tag != 24) {
          BIO_printf(bio_err, "Not ExtendedResponse\n");
          goto end;
      }
  
      /* pull resultCode */
      rem = end - cur;
      inf = ASN1_get_object(&cur, &len, &tag, &xclass, rem);
      if (inf != V_ASN1_UNIVERSAL || tag != V_ASN1_ENUMERATED || len == 0 ||
          (rem = end - cur, len > rem)) {
          BIO_printf(bio_err, "Not LDAPResult\n");
          goto end;
      }
  
      /* len should always be one, but just in case... */
      for (ret = 0, inf = 0; inf < len; inf++) {
          ret <<= 8;
          ret |= cur[inf];
      }
      /* There is more data, but we don't care... */
   end:
      return ret;
  }
  
  /*
   * Host dNS Name verifier: used for checking that the hostname is in dNS format
   * before setting it as SNI
   */
  static int is_dNS_name(const char *host)
  {
      const size_t MAX_LABEL_LENGTH = 63;
      size_t i;
      int isdnsname = 0;
      size_t length = strlen(host);
      size_t label_length = 0;
      int all_numeric = 1;
  
      /*
       * Deviation from strict DNS name syntax, also check names with '_'
       * Check DNS name syntax, any '-' or '.' must be internal,
       * and on either side of each '.' we can't have a '-' or '.'.
       *
       * If the name has just one label, we don't consider it a DNS name.
       */
      for (i = 0; i < length && label_length < MAX_LABEL_LENGTH; ++i) {
          char c = host[i];
  
          if ((c >= 'a' && c <= 'z')
              || (c >= 'A' && c <= 'Z')
              || c == '_') {
              label_length += 1;
              all_numeric = 0;
              continue;
          }
  
          if (c >= '0' && c <= '9') {
              label_length += 1;
              continue;
          }
  
          /* Dot and hyphen cannot be first or last. */
          if (i > 0 && i < length - 1) {
              if (c == '-') {
                  label_length += 1;
                  continue;
              }
              /*
               * Next to a dot the preceding and following characters must not be
               * another dot or a hyphen.  Otherwise, record that the name is
               * plausible, since it has two or more labels.
               */
              if (c == '.'
                  && host[i + 1] != '.'
                  && host[i - 1] != '-'
                  && host[i + 1] != '-') {
                  label_length = 0;
                  isdnsname = 1;
                  continue;
              }
          }
          isdnsname = 0;
          break;
      }
  
      /* dNS name must not be all numeric and labels must be shorter than 64 characters. */
      isdnsname &= !all_numeric && !(label_length == MAX_LABEL_LENGTH);
  
      return isdnsname;
  }
  #endif                          /* OPENSSL_NO_SOCK */
  