demos/bio/sconnect.c

   1 /*
   2  * Copyright 1998-2017 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 /*-
  11  * A minimal program to do SSL to a passed host and port.
  12  * It is actually using non-blocking IO but in a very simple manner
  13  * sconnect host:port - it does a 'GET / HTTP/1.0'
  14  *
  15  * cc -I../../include sconnect.c -L../.. -lssl -lcrypto
  16  */
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <unistd.h>
  20 #include <string.h>
  21 #include <errno.h>
  22 #include <openssl/err.h>
  23 #include <openssl/ssl.h>
  24
  25 #define HOSTPORT "localhost:4433"
  26 #define CAFILE "root.pem"
  27
  28 int main(int argc, char *argv[])
  29 {
  30     const char *hostport = HOSTPORT;
  31     const char *CAfile = CAFILE;
  32     char *hostname;
  33     char *cp;
  34     BIO *out = NULL;
  35     char buf[1024 * 10], *p;
  36     SSL_CTX *ssl_ctx = NULL;
  37     SSL *ssl;
  38     BIO *ssl_bio;
  39     int i, len, off, ret = EXIT_FAILURE;
  40
  41     if (argc > 1)
  42         hostport = argv[1];
  43     if (argc > 2)
  44         CAfile = argv[2];
  45
  46     hostname = OPENSSL_strdup(hostport);
  47     if ((cp = strchr(hostname, ':')) != NULL)
  48         *cp = 0;
  49
  50 #ifdef WATT32
  51     dbug_init();
  52     sock_init();
  53 #endif
  54
  55     ssl_ctx = SSL_CTX_new(TLS_client_method());
  56
  57     /* Enable trust chain verification */
  58     SSL_CTX_set_verify(ssl_ctx, SSL_VERIFY_PEER, NULL);
  59     SSL_CTX_load_verify_locations(ssl_ctx, CAfile, NULL);
  60
  61     /* Lets make a SSL structure */
  62     ssl = SSL_new(ssl_ctx);
  63     SSL_set_connect_state(ssl);
  64
  65     /* Enable peername verification */
  66     if (SSL_set1_host(ssl, hostname) <= 0)
  67         goto err;
  68
  69     /* Use it inside an SSL BIO */
  70     ssl_bio = BIO_new(BIO_f_ssl());
  71     BIO_set_ssl(ssl_bio, ssl, BIO_CLOSE);
  72
  73     /* Lets use a connect BIO under the SSL BIO */
  74     out = BIO_new(BIO_s_connect());
  75     BIO_set_conn_hostname(out, hostport);
  76     BIO_set_nbio(out, 1);
  77     out = BIO_push(ssl_bio, out);
  78
  79     p = "GET / HTTP/1.0\r\n\r\n";
  80     len = strlen(p);
  81
  82     off = 0;
  83     for (;;) {
  84         i = BIO_write(out, &(p[off]), len);
  85         if (i <= 0) {
  86             if (BIO_should_retry(out)) {
  87                 fprintf(stderr, "write DELAY\n");
  88                 sleep(1);
  89                 continue;
  90             } else {
  91                 goto err;
  92             }
  93         }
  94         off += i;
  95         len -= i;
  96         if (len <= 0)
  97             break;
  98     }
  99
 100     for (;;) {
 101         i = BIO_read(out, buf, sizeof(buf));
 102         if (i == 0)
 103             break;
 104         if (i < 0) {
 105             if (BIO_should_retry(out)) {
 106                 fprintf(stderr, "read DELAY\n");
 107                 sleep(1);
 108                 continue;
 109             }
 110             goto err;
 111         }
 112         fwrite(buf, 1, i, stdout);
 113     }
 114
 115     ret = EXIT_SUCCESS;
 116     goto done;
 117
 118  err:
 119     if (ERR_peek_error() == 0) { /* system call error */
 120         fprintf(stderr, "errno=%d ", errno);
 121         perror("error");
 122     } else {
 123         ERR_print_errors_fp(stderr);
 124     }
 125  done:
 126     BIO_free_all(out);
 127     SSL_CTX_free(ssl_ctx);
 128     return ret;
 129 }