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sconnect.c

/* NOCW */
/* demos/bio/sconnect.c */

/* A minimal program to do SSL to a passed host and port.
 * It is actually using non-blocking IO but in a very simple manner
 * sconnect host:port - it does a 'GET / HTTP/1.0'
 *
 * cc -I../../include sconnect.c -L../.. -lssl -lcrypto
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <openssl/err.h>
#include <openssl/ssl.h>

extern int errno;

int main(argc,argv)
int argc;
char *argv[];
      {
      char *host;
      BIO *out;
      char buf[1024*10],*p;
      SSL_CTX *ssl_ctx=NULL;
      SSL *ssl;
      BIO *ssl_bio;
      int i,len,off,ret=1;

      if (argc <= 1)
            host="localhost:4433";
      else
            host=argv[1];

#ifdef WATT32
      dbug_init();
      sock_init();
#endif

      /* Lets get nice error messages */
      SSL_load_error_strings();

      /* Setup all the global SSL stuff */
      OpenSSL_add_ssl_algorithms();
      ssl_ctx=SSL_CTX_new(SSLv23_client_method());

      /* Lets make a SSL structure */
      ssl=SSL_new(ssl_ctx);
      SSL_set_connect_state(ssl);

      /* Use it inside an SSL BIO */
      ssl_bio=BIO_new(BIO_f_ssl());
      BIO_set_ssl(ssl_bio,ssl,BIO_CLOSE);

      /* Lets use a connect BIO under the SSL BIO */
      out=BIO_new(BIO_s_connect());
      BIO_set_conn_hostname(out,host);
      BIO_set_nbio(out,1);
      out=BIO_push(ssl_bio,out);

      p="GET / HTTP/1.0\r\n\r\n";
      len=strlen(p);

      off=0;
      for (;;)
            {
            i=BIO_write(out,&(p[off]),len);
            if (i <= 0)
                  {
                  if (BIO_should_retry(out))
                        {
                        fprintf(stderr,"write DELAY\n");
                        sleep(1);
                        continue;
                        }
                  else
                        {
                        goto err;
                        }
                  }
            off+=i;
            len-=i;
            if (len <= 0) break;
            }

      for (;;)
            {
            i=BIO_read(out,buf,sizeof(buf));
            if (i == 0) break;
            if (i < 0)
                  {
                  if (BIO_should_retry(out))
                        {
                        fprintf(stderr,"read DELAY\n");
                        sleep(1);
                        continue;
                        }
                  goto err;
                  }
            fwrite(buf,1,i,stdout);
            }

      ret=1;

      if (0)
            {
err:
            if (ERR_peek_error() == 0) /* system call error */
                  {
                  fprintf(stderr,"errno=%d ",errno);
                  perror("error");
                  }
            else
                  ERR_print_errors_fp(stderr);
            }
      BIO_free_all(out);
      if (ssl_ctx != NULL) SSL_CTX_free(ssl_ctx);
      exit(!ret);
      return(ret);
      }


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