text: /*
   * Copyright 2013-2016 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (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 <string.h>
  #include <openssl/err.h>
  #include <openssl/ssl.h>
  #include <openssl/conf.h>
  
  int main(int argc, char **argv)
  {
      BIO *sbio = NULL, *out = NULL;
      int i, len, rv;
      char tmpbuf[1024];
      SSL_CTX *ctx = NULL;
      SSL_CONF_CTX *cctx = NULL;
      SSL *ssl = NULL;
      CONF *conf = NULL;
      STACK_OF(CONF_VALUE) *sect = NULL;
      CONF_VALUE *cnf;
      const char *connect_str = "localhost:4433";
      long errline = -1;
  
      ERR_load_crypto_strings();
      ERR_load_SSL_strings();
      SSL_library_init();
  
      conf = NCONF_new(NULL);
  
      if (NCONF_load(conf, "connect.cnf", &errline) <= 0) {
          if (errline <= 0)
              fprintf(stderr, "Error processing config file\n");
          else
              fprintf(stderr, "Error on line %ld\n", errline);
          goto end;
      }
  
      sect = NCONF_get_section(conf, "default");
  
      if (sect == NULL) {
          fprintf(stderr, "Error retrieving default section\n");
          goto end;
      }
  
      ctx = SSL_CTX_new(TLS_client_method());
      cctx = SSL_CONF_CTX_new();
      SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CLIENT);
      SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_FILE);
      SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
      for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
          cnf = sk_CONF_VALUE_value(sect, i);
          rv = SSL_CONF_cmd(cctx, cnf->name, cnf->value);
          if (rv > 0)
              continue;
          if (rv != -2) {
              fprintf(stderr, "Error processing %s = %s\n",
                      cnf->name, cnf->value);
              ERR_print_errors_fp(stderr);
              goto end;
          }
          if (strcmp(cnf->name, "Connect") == 0) {
              connect_str = cnf->value;
          } else {
              fprintf(stderr, "Unknown configuration option %s\n", cnf->name);
              goto end;
          }
      }
  
      if (!SSL_CONF_CTX_finish(cctx)) {
          fprintf(stderr, "Finish error\n");
          ERR_print_errors_fp(stderr);
          goto end;
      }
  
      /*
       * We'd normally set some stuff like the verify paths and * mode here
       * because as things stand this will connect to * any server whose
       * certificate is signed by any CA.
       */
  
      sbio = BIO_new_ssl_connect(ctx);
  
      BIO_get_ssl(sbio, &ssl);
  
      if (!ssl) {
          fprintf(stderr, "Can't locate SSL pointer\n");
          goto end;
      }
  
      /* Don't want any retries */
      SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
  
      /* We might want to do other things with ssl here */
  
      BIO_set_conn_hostname(sbio, connect_str);
  
      out = BIO_new_fp(stdout, BIO_NOCLOSE);
      if (BIO_do_connect(sbio) <= 0) {
          fprintf(stderr, "Error connecting to server\n");
          ERR_print_errors_fp(stderr);
          goto end;
      }
  
      if (BIO_do_handshake(sbio) <= 0) {
          fprintf(stderr, "Error establishing SSL connection\n");
          ERR_print_errors_fp(stderr);
          goto end;
      }
  
      /* Could examine ssl here to get connection info */
  
      BIO_puts(sbio, "GET / HTTP/1.0\n\n");
      for (;;) {
          len = BIO_read(sbio, tmpbuf, 1024);
          if (len <= 0)
              break;
          BIO_write(out, tmpbuf, len);
      }
   end:
      SSL_CONF_CTX_free(cctx);
      BIO_free_all(sbio);
      BIO_free(out);
      NCONF_free(conf);
      return 0;
  }
  