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      1 /*
      2  * Copyright 2013-2023 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     int ret = EXIT_FAILURE;
     29 
     30     conf = NCONF_new(NULL);
     31 
     32     if (NCONF_load(conf, "connect.cnf", &errline) <= 0) {
     33         if (errline <= 0)
     34             fprintf(stderr, "Error processing config file\n");
     35         else
     36             fprintf(stderr, "Error on line %ld\n", errline);
     37         goto end;
     38     }
     39 
     40     sect = NCONF_get_section(conf, "default");
     41 
     42     if (sect == NULL) {
     43         fprintf(stderr, "Error retrieving default section\n");
     44         goto end;
     45     }
     46 
     47     ctx = SSL_CTX_new(TLS_client_method());
     48     cctx = SSL_CONF_CTX_new();
     49     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CLIENT);
     50     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_FILE);
     51     SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
     52     for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
     53         cnf = sk_CONF_VALUE_value(sect, i);
     54         rv = SSL_CONF_cmd(cctx, cnf->name, cnf->value);
     55         if (rv > 0)
     56             continue;
     57         if (rv != -2) {
     58             fprintf(stderr, "Error processing %s = %s\n",
     59                 cnf->name, cnf->value);
     60             ERR_print_errors_fp(stderr);
     61             goto end;
     62         }
     63         if (strcmp(cnf->name, "Connect") == 0) {
     64             connect_str = cnf->value;
     65         } else {
     66             fprintf(stderr, "Unknown configuration option %s\n", cnf->name);
     67             goto end;
     68         }
     69     }
     70 
     71     if (!SSL_CONF_CTX_finish(cctx)) {
     72         fprintf(stderr, "Finish error\n");
     73         ERR_print_errors_fp(stderr);
     74         goto end;
     75     }
     76 
     77     /*
     78      * We'd normally set some stuff like the verify paths and * mode here
     79      * because as things stand this will connect to * any server whose
     80      * certificate is signed by any CA.
     81      */
     82 
     83     sbio = BIO_new_ssl_connect(ctx);
     84 
     85     BIO_get_ssl(sbio, &ssl);
     86 
     87     if (!ssl) {
     88         fprintf(stderr, "Can't locate SSL pointer\n");
     89         goto end;
     90     }
     91 
     92     /* We might want to do other things with ssl here */
     93 
     94     BIO_set_conn_hostname(sbio, connect_str);
     95 
     96     out = BIO_new_fp(stdout, BIO_NOCLOSE);
     97     if (BIO_do_connect(sbio) <= 0) {
     98         fprintf(stderr, "Error connecting to server\n");
     99         ERR_print_errors_fp(stderr);
    100         goto end;
    101     }
    102 
    103     /* Could examine ssl here to get connection info */
    104 
    105     BIO_puts(sbio, "GET / HTTP/1.0\n\n");
    106     for (;;) {
    107         len = BIO_read(sbio, tmpbuf, 1024);
    108         if (len <= 0)
    109             break;
    110         BIO_write(out, tmpbuf, len);
    111     }
    112     ret = EXIT_SUCCESS;
    113 
    114 end:
    115     SSL_CONF_CTX_free(cctx);
    116     BIO_free_all(sbio);
    117     BIO_free(out);
    118     NCONF_free(conf);
    119     return ret;
    120 }
    121