/*
* Read data from the Telnet session to the raw input queue.
*/
static void
telnet_read(ndesc_t *nd, telnet_t *tp)
{
int cc;
if (!nq_full(tp->t_rawq))
{
if (tp->t_flags & TF_URGENT)
{
if (at_mark(nd_fd(nd)))
{
tp->t_flags &= ~TF_URGENT;
nd_enable(nd, ND_X);
}
}
cc = nq_recv(tp->t_rawq, nd_fd(nd), &tp->t_rblen);
if (cc == -1)
{
switch (errno)
{
case EWOULDBLOCK:
case EINTR:
case EPROTO:
break;
default:
telnet_disconnect(tp);
return;
}
}
if (cc == 0)
{
telnet_disconnect(tp);
return;
}
if ((tp->t_flags & TF_FLOWC) == 0)
nd_enable(nd, ND_C);
telnet_enabr(tp);
if (!nq_full(tp->t_rawq))
return;
}
tp->t_flags |= TF_ENABR;
nd_disable(nd, ND_R);
}
/*
* Write data from the output queue to the Telnet session.
*/
static void
telnet_write(ndesc_t *nd, telnet_t *tp)
{
if (!nq_empty(tp->t_outq))
{
if (nq_send(tp->t_outq, nd_fd(nd), &tp->t_sblen) == -1)
{
switch (errno)
{
case EWOULDBLOCK:
case EINTR:
case EPROTO:
break;
default:
telnet_disconnect(tp);
return;
}
}
}
if (tp->t_flags & TF_OVFLOUTQ)
{
if (nq_len(tp->t_outq) < TELNET_OUTQ_LOWAT)
{
tp->t_flags &= ~TF_OVFLOUTQ;
nq_puts(tp->t_outq, (u_char *)"*** Truncated. ***\r\n");
}
}
if (tp->t_flags & TF_FLOWC)
{
if (nq_len(tp->t_outq) < TELNET_OUTQ_HIWAT)
{
tp->t_flags &= ~TF_FLOWC;
nd_enable(nd, ND_C);
}
}
if (!nq_empty(tp->t_outq))
return;
nq_init(tp->t_outq);
tp->t_flags |= TF_ENABW;
nd_disable(nd, ND_W);
}
/*
* Write data from the output queue to the Telnet session.
*/
static void
telnet_write(ndesc_t *nd, telnet_t *tp)
{
if (!nq_empty(tp->t_outq))
{
if (nq_send(tp->t_outq, nd_fd(nd), &tp->t_sblen) == -1)
{
switch (errno)
{
case EWOULDBLOCK:
case EINTR:
case EPROTO:
break;
default:
telnet_disconnect(tp);
return;
}
}
}
if (tp->t_flags & TF_OVFLOUTQ)
{
if (nq_len(tp->t_outq) < TELNET_OUTQ_LOWAT)
{
tp->t_flags &= ~TF_OVFLOUTQ;
if (tp->t_flags & (TF_INPUT|TF_DISCONNECT) &&
!tp->task) /* Reenable command processing */
tp->task = create_task(telnet_interactive, tp);
}
}
if (!nq_empty(tp->t_outq))
return;
nq_init(tp->t_outq);
nd_disable(nd, ND_W);
}