demos/bio/client-conf.c

   1 /*
   2  * Copyright 2013-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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     /* Don't want any retries */
  92     SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
  93
  94     /* We might want to do other things with ssl here */
  95
  96     BIO_set_conn_hostname(sbio, connect_str);
  97
  98     out = BIO_new_fp(stdout, BIO_NOCLOSE);
  99     if (BIO_do_connect(sbio) <= 0) {
 100         fprintf(stderr, "Error connecting to server\n");
 101         ERR_print_errors_fp(stderr);
 102         goto end;
 103     }
 104
 105     if (BIO_do_handshake(sbio) <= 0) {
 106         fprintf(stderr, "Error establishing SSL connection\n");
 107         ERR_print_errors_fp(stderr);
 108         goto end;
 109     }
 110
 111     /* Could examine ssl here to get connection info */
 112
 113     BIO_puts(sbio, "GET / HTTP/1.0\n\n");
 114     for (;;) {
 115         len = BIO_read(sbio, tmpbuf, 1024);
 116         if (len <= 0)
 117             break;
 118         BIO_write(out, tmpbuf, len);
 119     }
 120  end:
 121     SSL_CONF_CTX_free(cctx);
 122     BIO_free_all(sbio);
 123     BIO_free(out);
 124     NCONF_free(conf);
 125     return 0;
 126 }