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      1 /*
      2  * Copyright 2013-2021 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      4  * Licensed under the Apache License 2.0 (the "License").  You may not use
      5  * this file except in compliance with the License.  You can obtain a copy
      6  * in the file LICENSE in the source distribution or at
      7  * https://www.openssl.org/source/license.html
      8  */
      9 
     10 #include <string.h>
     11 #include <openssl/err.h>
     12 #include <openssl/ssl.h>
     13 #include <openssl/conf.h>
     14 
     15 int main(int argc, char **argv)
     16 {
     17     BIO *sbio = NULL, *out = NULL;
     18     int i, len, rv;
     19     char tmpbuf[1024];
     20     SSL_CTX *ctx = NULL;
     21     SSL_CONF_CTX *cctx = NULL;
     22     SSL *ssl = NULL;
     23     CONF *conf = NULL;
     24     STACK_OF(CONF_VALUE) *sect = NULL;
     25     CONF_VALUE *cnf;
     26     const char *connect_str = "localhost:4433";
     27     long errline = -1;
     28 
     29     conf = NCONF_new(NULL);
     30 
     31     if (NCONF_load(conf, "connect.cnf", &errline) <= 0) {
     32         if (errline <= 0)
     33             fprintf(stderr, "Error processing config file\n");
     34         else
     35             fprintf(stderr, "Error on line %ld\n", errline);
     36         goto end;
     37     }
     38 
     39     sect = NCONF_get_section(conf, "default");
     40 
     41     if (sect == NULL) {
     42         fprintf(stderr, "Error retrieving default section\n");
     43         goto end;
     44     }
     45 
     46     ctx = SSL_CTX_new(TLS_client_method());
     47     cctx = SSL_CONF_CTX_new();
     48     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CLIENT);
     49     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_FILE);
     50     SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
     51     for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
     52         cnf = sk_CONF_VALUE_value(sect, i);
     53         rv = SSL_CONF_cmd(cctx, cnf->name, cnf->value);
     54         if (rv > 0)
     55             continue;
     56         if (rv != -2) {
     57             fprintf(stderr, "Error processing %s = %s\n",
     58                     cnf->name, cnf->value);
     59             ERR_print_errors_fp(stderr);
     60             goto end;
     61         }
     62         if (strcmp(cnf->name, "Connect") == 0) {
     63             connect_str = cnf->value;
     64         } else {
     65             fprintf(stderr, "Unknown configuration option %s\n", cnf->name);
     66             goto end;
     67         }
     68     }
     69 
     70     if (!SSL_CONF_CTX_finish(cctx)) {
     71         fprintf(stderr, "Finish error\n");
     72         ERR_print_errors_fp(stderr);
     73         goto end;
     74     }
     75 
     76     /*
     77      * We'd normally set some stuff like the verify paths and * mode here
     78      * because as things stand this will connect to * any server whose
     79      * certificate is signed by any CA.
     80      */
     81 
     82     sbio = BIO_new_ssl_connect(ctx);
     83 
     84     BIO_get_ssl(sbio, &ssl);
     85 
     86     if (!ssl) {
     87         fprintf(stderr, "Can't locate SSL pointer\n");
     88         goto end;
     89     }
     90 
     91     /* We might want to do other things with ssl here */
     92 
     93     BIO_set_conn_hostname(sbio, connect_str);
     94 
     95     out = BIO_new_fp(stdout, BIO_NOCLOSE);
     96     if (BIO_do_connect(sbio) <= 0) {
     97         fprintf(stderr, "Error connecting to server\n");
     98         ERR_print_errors_fp(stderr);
     99         goto end;
    100     }
    101 
    102     /* Could examine ssl here to get connection info */
    103 
    104     BIO_puts(sbio, "GET / HTTP/1.0\n\n");
    105     for (;;) {
    106         len = BIO_read(sbio, tmpbuf, 1024);
    107         if (len <= 0)
    108             break;
    109         BIO_write(out, tmpbuf, len);
    110     }
    111  end:
    112     SSL_CONF_CTX_free(cctx);
    113     BIO_free_all(sbio);
    114     BIO_free(out);
    115     NCONF_free(conf);
    116     return 0;
    117 }
    118