demos/bio/client-arg.c

   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
  14 int main(int argc, char **argv)
  15 {
  16     BIO *sbio = NULL, *out = NULL;
  17     int len;
  18     char tmpbuf[1024];
  19     SSL_CTX *ctx;
  20     SSL_CONF_CTX *cctx;
  21     SSL *ssl;
  22     char **args = argv + 1;
  23     const char *connect_str = "localhost:4433";
  24     int nargs = argc - 1;
  25
  26     ctx = SSL_CTX_new(TLS_client_method());
  27     cctx = SSL_CONF_CTX_new();
  28     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CLIENT);
  29     SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
  30     while (*args && **args == '-') {
  31         int rv;
  32         /* Parse standard arguments */
  33         rv = SSL_CONF_cmd_argv(cctx, &nargs, &args);
  34         if (rv == -3) {
  35             fprintf(stderr, "Missing argument for %s\n", *args);
  36             goto end;
  37         }
  38         if (rv < 0) {
  39             fprintf(stderr, "Error in command %s\n", *args);
  40             ERR_print_errors_fp(stderr);
  41             goto end;
  42         }
  43         /* If rv > 0 we processed something so proceed to next arg */
  44         if (rv > 0)
  45             continue;
  46         /* Otherwise application specific argument processing */
  47         if (strcmp(*args, "-connect") == 0) {
  48             connect_str = args[1];
  49             if (connect_str == NULL) {
  50                 fprintf(stderr, "Missing -connect argument\n");
  51                 goto end;
  52             }
  53             args += 2;
  54             nargs -= 2;
  55             continue;
  56         } else {
  57             fprintf(stderr, "Unknown argument %s\n", *args);
  58             goto end;
  59         }
  60     }
  61
  62     if (!SSL_CONF_CTX_finish(cctx)) {
  63         fprintf(stderr, "Finish error\n");
  64         ERR_print_errors_fp(stderr);
  65         goto end;
  66     }
  67
  68     /*
  69      * We'd normally set some stuff like the verify paths and * mode here
  70      * because as things stand this will connect to * any server whose
  71      * certificate is signed by any CA.
  72      */
  73
  74     sbio = BIO_new_ssl_connect(ctx);
  75
  76     BIO_get_ssl(sbio, &ssl);
  77
  78     if (!ssl) {
  79         fprintf(stderr, "Can't locate SSL pointer\n");
  80         goto end;
  81     }
  82
  83     /* We might want to do other things with ssl here */
  84
  85     BIO_set_conn_hostname(sbio, connect_str);
  86
  87     out = BIO_new_fp(stdout, BIO_NOCLOSE);
  88     if (BIO_do_connect(sbio) <= 0) {
  89         fprintf(stderr, "Error connecting to server\n");
  90         ERR_print_errors_fp(stderr);
  91         goto end;
  92     }
  93
  94     /* Could examine ssl here to get connection info */
  95
  96     BIO_puts(sbio, "GET / HTTP/1.0\n\n");
  97     for (;;) {
  98         len = BIO_read(sbio, tmpbuf, 1024);
  99         if (len <= 0)
 100             break;
 101         BIO_write(out, tmpbuf, len);
 102     }
 103  end:
 104     SSL_CONF_CTX_free(cctx);
 105     BIO_free_all(sbio);
 106     BIO_free(out);
 107     return 0;
 108 }