demos/bio/sconnect.c

   1 /* NOCW */
   2 /* demos/bio/sconnect.c */
   3
   4 /* A minimal program to do SSL to a passed host and port.
   5  * It is actually using non-blocking IO but in a very simple manner
   6  * sconnect host:port - it does a 'GET / HTTP/1.0'
   7  *
   8  * cc -I../../include sconnect.c -L../.. -lssl -lcrypto
   9  */
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <openssl/err.h>
  14 #include <openssl/ssl.h>
  15
  16 extern int errno;
  17
  18 int main(argc,argv)
  19 int argc;
  20 char *argv[];
  21         {
  22         char *host;
  23         BIO *out;
  24         char buf[1024*10],*p;
  25         SSL_CTX *ssl_ctx=NULL;
  26         SSL *ssl;
  27         BIO *ssl_bio;
  28         int i,len,off,ret=1;
  29
  30         if (argc <= 1)
  31                 host="localhost:4433";
  32         else
  33                 host=argv[1];
  34
  35 #ifdef WATT32
  36         dbug_init();
  37         sock_init();
  38 #endif
  39
  40         /* Lets get nice error messages */
  41         SSL_load_error_strings();
  42
  43         /* Setup all the global SSL stuff */
  44         OpenSSL_add_ssl_algorithms();
  45         ssl_ctx=SSL_CTX_new(SSLv23_client_method());
  46
  47         /* Lets make a SSL structure */
  48         ssl=SSL_new(ssl_ctx);
  49         SSL_set_connect_state(ssl);
  50
  51         /* Use it inside an SSL BIO */
  52         ssl_bio=BIO_new(BIO_f_ssl());
  53         BIO_set_ssl(ssl_bio,ssl,BIO_CLOSE);
  54
  55         /* Lets use a connect BIO under the SSL BIO */
  56         out=BIO_new(BIO_s_connect());
  57         BIO_set_conn_hostname(out,host);
  58         BIO_set_nbio(out,1);
  59         out=BIO_push(ssl_bio,out);
  60
  61         p="GET / HTTP/1.0\r\n\r\n";
  62         len=strlen(p);
  63
  64         off=0;
  65         for (;;)
  66                 {
  67                 i=BIO_write(out,&(p[off]),len);
  68                 if (i <= 0)
  69                         {
  70                         if (BIO_should_retry(out))
  71                                 {
  72                                 fprintf(stderr,"write DELAY\n");
  73                                 sleep(1);
  74                                 continue;
  75                                 }
  76                         else
  77                                 {
  78                                 goto err;
  79                                 }
  80                         }
  81                 off+=i;
  82                 len-=i;
  83                 if (len <= 0) break;
  84                 }
  85
  86         for (;;)
  87                 {
  88                 i=BIO_read(out,buf,sizeof(buf));
  89                 if (i == 0) break;
  90                 if (i < 0)
  91                         {
  92                         if (BIO_should_retry(out))
  93                                 {
  94                                 fprintf(stderr,"read DELAY\n");
  95                                 sleep(1);
  96                                 continue;
  97                                 }
  98                         goto err;
  99                         }
 100                 fwrite(buf,1,i,stdout);
 101                 }
 102
 103         ret=1;
 104
 105         if (0)
 106                 {
 107 err:
 108                 if (ERR_peek_error() == 0) /* system call error */
 109                         {
 110                         fprintf(stderr,"errno=%d ",errno);
 111                         perror("error");
 112                         }
 113                 else
 114                         ERR_print_errors_fp(stderr);
 115                 }
 116         BIO_free_all(out);
 117         if (ssl_ctx != NULL) SSL_CTX_free(ssl_ctx);
 118         exit(!ret);
 119         return(ret);
 120         }
 121