I try to learn how to work with Opensll library. I make this simple client
#include <openssl/ssl.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <stdio.h>
int main()
{
/* Define varialbles */
SSL * ssl;
SSL_CTX * ctx;
X509 * server_cert;
int p,err;
char * request = "GET / HTTP/1.1\x0D\x0AHost:
www.verisign.com\x0D\x0A\x43onnection: Close\x0D\x0A\x0D\x0A";
char r[1024];
BIO * bio;
/* Set up the library */
ERR_load_BIO_strings();
SSL_load_error_strings();
OpenSSL_add_all_algorithms();
SSL_library_init();
/* Set up the SSL context */
ctx = SSL_CTX_new(SSLv23_client_method());
/* Load the trust store */
SSL_CTX_use_certificate_file(ctx, "cakey.pem", SSL_FILETYPE_PEM);
SSL_CTX_use_PrivateKey_file(ctx, "cakey.pem", SSL_FILETYPE_PEM);
if(! SSL_CTX_load_verify_locations(ctx, "cacert.pem", NULL))
{
fprintf(stderr, "Error loading trust store\n");
ERR_print_errors_fp(stderr);
SSL_CTX_free(ctx);
return 0;
}
/* Setup the connection */
bio = BIO_new_ssl_connect(ctx);
/* Set the SSL_MODE_AUTO_RETRY flag */
BIO_get_ssl(bio, & ssl);
SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
/* Create and setup the connection */
BIO_set_conn_hostname(bio, "www.verisign.com:https");
if(BIO_do_connect(bio) <= 0)
{
fprintf(stderr, "Error attempting to connect\n");
ERR_print_errors_fp(stderr);
BIO_free_all(bio);
SSL_CTX_free(ctx);
return 0;
}
/*information about connection*/
printf ("SSL connection using %s\n", SSL_get_cipher (ssl));
server_cert = SSL_get_peer_certificate (ssl);
printf ("%s\n",SSL_get_version(ssl));
printf ("Server certificate: %s\n\n\n", server_cert);
/* Send the request */
BIO_write(bio, request, strlen(request));
/* Read in the response */
do{
p = BIO_read(bio, r, 1023);
if(p <= 0) {break;}
r[p] = 0;
printf("%s", r);
}while (BIO_pending(bio)>0);
/* Close the connection and free the context */
err = SSL_shutdown(ssl);
BIO_free_all(bio);
SSL_CTX_free(ctx);
return 0;
}
I have a problem in the section (Read in the response). For my futher work i
need to know if in the internal openssl buffer are still some data. I thing
that best method to recognize it will be the BIO_pending(), but this function
gives me everytime number 0, that there aren`t any data. But when I try to read
(BIO_read()) again some data are still there.
Please can you advise me how to change my code.
P.S. I`m sorry for my English. :o(
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