[Libevent-users] No data flowing in bufferevent_openssl_filter_new

[Nils Rennebarth <nils.rennebarth@xxxxxxxxx>]

Hi,

I am rather new to libevent and I am doing the following in a smaller server application:
 - Create an event loop listening for connections on a given port.
 - If the first data sent by the client looks like an SSL client Hello, switch the
   connection to ssl, by installing a filter.
 - process data as ususal (simply echo it)

When connecting to the server with telnet, all is working. When connecting to the
server with the openssl s_client, I do get a successful SSL handshake, but after that,
I can only write data to the server and never get anything back, and debug output
shows, that clientRead is never called. What am I doing wrong?

This is the read callback installed by bufferevent_setcb:

static void clientInitialRead(struct bufferevent *bev, void *arg)
{
	connState_t *conn = arg;
	struct evbuffer *evi = bufferevent_get_input(bev);
	struct evbuffer_iovec cont;
	struct bufferevent *bevSsl;

	evbuffer_peek(evi, -1, NULL, &cont, 1);
	if (isSslClientHello(&cont, conn)) {
		bevSsl = bufferevent_openssl_filter_new(conn->global->mainEvents,
		  bev, conn->ssl, BUFFEREVENT_SSL_ACCEPTING, BEV_OPT_DEFER_CALLBACKS);
		if (!bevSsl) {
			PA_WARNING("Error creating SSL filter bev");
			return;
		}
		conn->bev = bevSsl;
		bufferevent_setcb(bevSsl, clientRead, clientWrite, clientEvent, conn);
		bufferevent_setwatermark(bevSsl, EV_READ, 0, 16348);
		bufferevent_enable(bevSsl, EV_READ|EV_WRITE);
	} else {
		clientRead(bev, arg);
	}
}

And this is the "normal" read callback:

static void clientRead(struct bufferevent *bev, void *arg)
{
	connState_t *conn = arg;
	struct evbuffer *evi = bufferevent_get_input(bev);
	struct evbuffer *evo = bufferevent_get_output(bev);

	evbuffer_remove_buffer(evi, evo, evbuffer_get_length(evi));
}


-- 
Nils Rennebarth
Software Developer
Teldat packetalarm logo
Teldat Security GmbH
Moenchhaldenstr. 28
D-70191 Stuttgart
Tel: +49 711 900300 - 62
Fax: +49 711 900300 - 90
E-Mail: nils.rennebarth@xxxxxxxxx

Location: GmbH Nuernberg, Local Court Nuernberg, HRB 25481 Managing Director: Bernd Buettner

Teldat packetalarm banner

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