/*

 * 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;

    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;

}