Problem - Kevin Tafuro

Once we have the URLof the CRLwe want, it is a simple matter to retrieve it using
the HTTP protocol. OpenSSLdoes not provide even the simplest of HTTP clients, so
we must speak the bare minimum ourselves to connect to the server and retrieve the
data.
static void *retrieve_webdata(char *uri, int *datalen, spc_x509store_t *store) {
int bytes, content_length = 0, headerlen = 0, sd, ssl;
BIO *conn = 0;
SSL *ssl_ptr;
char buffer[1024];
char *headers = 0, *host = 0, *path = 0, *port = 0, *tmp;
void *data = 0;
fd_set rmask, wmask;
SSL_CTX *ctx = 0;
*datalen = 0;
if (!OCSP_parse_url(uri, &host, &port, &path, &ssl)) goto end_error;
if (!(conn = spc_connect(host, atoi(port), ssl, store, &ctx))) goto end_error;
/* Send the request for the data */
BIO_printf(conn, "GET %s HTTP/1.0\r\nConnection: close\r\n\r\n", path);
/* Put the socket into non-blocking mode */
BIO_get_fd(conn, &sd);
BIO_socket_nbio(sd, 1);
if (ssl) {
BIO_get_ssl(conn, &ssl_ptr);
SSL_set_mode(ssl_ptr, SSL_MODE_ENABLE_PARTIAL_WRITE |
SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
}
/* Loop reading data from the socket until we've got all of the headers */
for (;;) {
FD_ZERO(&rmask);
FD_SET(sd, &rmask);
FD_ZERO(&wmask);
if (BIO_should_write(conn)) FD_SET(sd, &wmask);
if (select(FD_SETSIZE, &rmask, &wmask, 0, 0)