/*
     * Track incoming and outgoing data sizes and time, for
     * size-based rekeys.
     */
    unsigned long incoming_data_size, outgoing_data_size, deferred_data_size;
    unsigned long max_data_size;
    int kex_in_progress;
    long next_rekey, last_rekey;
};

#define logevent(s) logevent(ssh->frontend, s)

/* logevent, only printf-formatted. */
static void logeventf(Ssh ssh, const char *fmt, ...)
{

	freebn(s->p);
    }

    /*
     * Key exchange is over. Schedule a timer for our next rekey.
     */
    ssh->kex_in_progress = FALSE;
    ssh->last_rekey = GETTICKCOUNT();
    if (ssh->cfg.ssh_rekey_time != 0)
	ssh->next_rekey = schedule_timer(ssh->cfg.ssh_rekey_time*60*TICKSPERSEC,
					 ssh2_timer, ssh);
    
    /*
     * If this is the first key exchange phase, we must pass the
     * SSH2_MSG_NEWKEYS packet to the next layer, not because it

    ssh->packet_dispatch[SSH2_MSG_DEBUG] = ssh2_msg_debug;
}

static void ssh2_timer(void *ctx, long now)
{
    Ssh ssh = (Ssh)ctx;

    if (!ssh->kex_in_progress && ssh->cfg.ssh_rekey_time != 0 &&
	now - ssh->next_rekey >= 0) {
	do_ssh2_transport(ssh, "Initiating key re-exchange (timeout)",
			  -1, NULL);
    }
}

static void ssh2_protocol(Ssh ssh, unsigned char *in, int inlen,

/*
 * Reconfigure the SSH backend.
 */
static void ssh_reconfig(void *handle, Config *cfg)
{
    Ssh ssh = (Ssh) handle;
    char *rekeying = NULL;
    unsigned long old_max_data_size;

    pinger_reconfig(ssh->pinger, &ssh->cfg, cfg);
    ssh_setup_portfwd(ssh, cfg);

    if (ssh->cfg.ssh_rekey_time != cfg->ssh_rekey_time &&
	cfg->ssh_rekey_time != 0) {
	long new_next = ssh->last_rekey + cfg->ssh_rekey_time*60*TICKSPERSEC;
	long now = GETTICKCOUNT();

	if (new_next - now < 0) {
	    rekeying = "Initiating key re-exchange (timeout shortened)";
	} else {
	    ssh->next_rekey = schedule_timer(new_next - now, ssh2_timer, ssh);
	}
    }

    old_max_data_size = ssh->max_data_size;
    ssh->max_data_size = parse_blocksize(cfg->ssh_rekey_data);
    if (old_max_data_size != ssh->max_data_size &&
	ssh->max_data_size != 0) {
	if (ssh->outgoing_data_size > ssh->max_data_size ||
	    ssh->incoming_data_size > ssh->max_data_size)
	    rekeying = "Initiating key re-exchange (data limit lowered)";
    }

    if (rekeying && !ssh->kex_in_progress) {
	do_ssh2_transport(ssh, rekeying, -1, NULL);
    }

    ssh->cfg = *cfg;		       /* STRUCTURE COPY */
}

/*
 * Called to send data down the Telnet connection.
 */
static int ssh_send(void *handle, char *buf, int len)