demos/bio/sconnect.c

   1 /*
   2  * Copyright 1998-2020 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 /*-
  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     const 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 #ifdef WATT32
  47     dbug_init();
  48     sock_init();
  49 #endif
  50
  51     ssl_ctx = SSL_CTX_new(TLS_client_method());
  52
  53     /* Enable trust chain verification */
  54     SSL_CTX_set_verify(ssl_ctx, SSL_VERIFY_PEER, NULL);
  55     SSL_CTX_load_verify_locations(ssl_ctx, CAfile, NULL);
  56
  57     /* Lets make a SSL structure */
  58     ssl = SSL_new(ssl_ctx);
  59     SSL_set_connect_state(ssl);
  60
  61
  62     /* Use it inside an SSL BIO */
  63     ssl_bio = BIO_new(BIO_f_ssl());
  64     BIO_set_ssl(ssl_bio, ssl, BIO_CLOSE);
  65
  66     /* Lets use a connect BIO under the SSL BIO */
  67     out = BIO_new(BIO_s_connect());
  68     BIO_set_conn_hostname(out, hostport);
  69
  70     /* The BIO has parsed the host:port and even IPv6 literals in [] */
  71     hostname = BIO_get_conn_hostname(out);
  72     if (!hostname || SSL_set1_host(ssl, hostname) <= 0)
  73         goto err;
  74
  75     BIO_set_nbio(out, 1);
  76     out = BIO_push(ssl_bio, out);
  77
  78     p = "GET / HTTP/1.0\r\n\r\n";
  79     len = strlen(p);
  80
  81     off = 0;
  82     for (;;) {
  83         i = BIO_write(out, &(p[off]), len);
  84         if (i <= 0) {
  85             if (BIO_should_retry(out)) {
  86                 fprintf(stderr, "write DELAY\n");
  87                 sleep(1);
  88                 continue;
  89             } else {
  90                 goto err;
  91             }
  92         }
  93         off += i;
  94         len -= i;
  95         if (len <= 0)
  96             break;
  97     }
  98
  99     for (;;) {
 100         i = BIO_read(out, buf, sizeof(buf));
 101         if (i == 0)
 102             break;
 103         if (i < 0) {
 104             if (BIO_should_retry(out)) {
 105                 fprintf(stderr, "read DELAY\n");
 106                 sleep(1);
 107                 continue;
 108             }
 109             goto err;
 110         }
 111         fwrite(buf, 1, i, stdout);
 112     }
 113
 114     ret = EXIT_SUCCESS;
 115     goto done;
 116
 117  err:
 118     if (ERR_peek_error() == 0) { /* system call error */
 119         fprintf(stderr, "errno=%d ", errno);
 120         perror("error");
 121     } else {
 122         ERR_print_errors_fp(stderr);
 123     }
 124  done:
 125     BIO_free_all(out);
 126     SSL_CTX_free(ssl_ctx);
 127     return ret;
 128 }