enum evcom_stream_state
evcom_stream_state (evcom_stream *stream)
{
if (stream->recvfd < 0 && stream->sendfd && stream->flags == 0) {
return EVCOM_INITIALIZED;
}
if (stream->recvfd < 0 && stream->sendfd < 0) return EVCOM_CLOSED;
if (!CONNECTED(stream)) return EVCOM_CONNECTING;
if (GOT_CLOSE(stream)) {
if (READABLE(stream)) {
return EVCOM_CONNECTED_RO;
} else {
return EVCOM_CLOSING;
}
}
if (READABLE(stream) && WRITABLE(stream)) return EVCOM_CONNECTED_RW;
if (WRITABLE(stream)) return EVCOM_CONNECTED_WO;
if (READABLE(stream)) return EVCOM_CONNECTED_RO;
return EVCOM_CLOSING;
}
static int
stream_recv__wait_for_close (evcom_stream *stream)
{
assert(!READABLE(stream));
if (!WRITABLE(stream)) {
stream->recv_action = stream_recv__close;
return OKAY;
}
ev_io_stop(D_LOOP_(stream) &stream->read_watcher);
return AGAIN;
}
int
fix_gmode(sccs *s, int gflags)
{
ser_t d;
/*
* Do not fix mode of symlink target, the file may not be
* under BK control.
*/
if (S_ISLNK(s->mode)) return (0);
if ((gflags&GET_EDIT) && WRITABLE(s)) return (0);
if (!(gflags&GET_EDIT) && !WRITABLE(s)) return (0);
d = sccs_top(s);
if (MODE(s, d)) s->mode = MODE(s, d);
unless (gflags&GET_EDIT) {
s->mode &= ~0222; /* turn off write mode */
}
if (chmod(s->gfile, s->mode)) return (1);
return (0);
}
void
evcom_stream_attach (EV_P_ evcom_stream *stream)
{
D_LOOP_SET(stream, EV_A);
stream->flags |= EVCOM_ATTACHED;
ev_timer_again(EV_A_ &stream->timeout_watcher);
if (READABLE(stream)) {
ev_io_start(EV_A_ &stream->read_watcher);
}
if (WRITABLE(stream)) {
ev_io_start(EV_A_ &stream->write_watcher);
}
}
static int
stream_send__data (evcom_stream *stream)
{
ssize_t sent;
while (!evcom_queue_empty(&stream->out)) {
assert(WRITABLE(stream));
evcom_queue *q = evcom_queue_last(&stream->out);
evcom_buf *buf = evcom_queue_data(q, evcom_buf, queue);
#if EVCOM_HAVE_GNUTLS
if (SECURE(stream)) {
sent = gnutls_record_send(stream->session,
buf->base + buf->written,
buf->len - buf->written);
if (sent == GNUTLS_E_INTERRUPTED || sent == GNUTLS_E_AGAIN) {
if (0 == gnutls_record_get_direction((stream)->session)) {
fprintf(stderr, "(evcom) gnutls send: unexpected switch direction!\n");
ev_io_start(D_LOOP_(stream) &(stream)->read_watcher);
ev_io_stop(D_LOOP_(stream) &(stream)->write_watcher);
}
return AGAIN;
}
if (gnutls_error_is_fatal(sent)) {
stream->gnutls_errorno = sent;
stream->send_action = stream_send__close;
return OKAY;
}
} else
#endif // EVCOM_HAVE_GNUTLS
{
/* TODO use writev() here? */
sent = nosigpipe_stream_send(stream,
buf->base + buf->written,
buf->len - buf->written);
}
if (sent <= 0) {
switch (errno) {
case EAGAIN:
case EINTR:
assert(stream->send_action == stream_send__data);
return AGAIN;
default:
stream->errorno = errno;
evcom_perror("send()", errno);
/* pass through */
case EPIPE:
stream->send_action = stream_send__close;
return OKAY;
}
}
ev_timer_again(D_LOOP_(stream) &stream->timeout_watcher);
assert(sent >= 0);
buf->written += sent;
if (buf->written == buf->len) {
evcom_queue_remove(q);
if (buf->release) buf->release(buf);
}
}
assert(evcom_queue_empty(&stream->out));
stream->send_action = stream_send__drain;
return OKAY;
}
static int
stream_recv__data (evcom_stream *stream)
{
char buf[EVCOM_CHUNKSIZE];
size_t buf_size = EVCOM_CHUNKSIZE;
ssize_t recved;
while (READABLE(stream)) {
assert(CONNECTED(stream));
if (PAUSED(stream)) {
stream->recv_action = stream_recv__wait_for_resume;
return OKAY;
}
#if EVCOM_HAVE_GNUTLS
if (SECURE(stream)) {
recved = gnutls_record_recv(stream->session, buf, buf_size);
if (gnutls_error_is_fatal(recved)) {
stream->gnutls_errorno = recved;
stream->recv_action = stream_recv__close;
return OKAY;
}
if (recved == GNUTLS_E_INTERRUPTED || recved == GNUTLS_E_AGAIN) {
if (1 == gnutls_record_get_direction((stream)->session)) {
fprintf(stderr, "(evcom) gnutls recv: unexpected switch direction!\n");
ev_io_stop(D_LOOP_(stream) &(stream)->read_watcher);
ev_io_start(D_LOOP_(stream) &(stream)->write_watcher);
}
return AGAIN;
}
/* A server may also receive GNUTLS_E_REHANDSHAKE when a client has
* initiated a andshake. In that case the server can only initiate a
* handshake or terminate the connection. */
if (recved == GNUTLS_E_REHANDSHAKE) {
assert(WRITABLE(stream));
stream->recv_action = stream__handshake;
stream->send_action = stream__handshake;
return OKAY;
}
} else
#endif /* EVCOM_HAVE_GNUTLS */
{
recved = read(stream->recvfd, buf, buf_size);
}
if (recved < 0) {
if (errno == EAGAIN || errno == EINTR) {
assert(stream->recv_action == stream_recv__data);
return AGAIN;
}
if (errno != ECONNRESET) {
evcom_perror("recv()", stream->errorno);
}
stream->errorno = errno;
stream->recv_action = stream_recv__close;
return OKAY;
}
ev_timer_again(D_LOOP_(stream) &stream->timeout_watcher);
assert(recved >= 0);
if (recved == 0) {
stream->flags &= ~EVCOM_READABLE;
ev_io_stop(D_LOOP_(stream) &stream->read_watcher);
stream->recv_action = stream_recv__wait_for_close;
}
/* NOTE: EOF is signaled with recved == 0 on callback */
if (stream->on_read) stream->on_read(stream, buf, recved);
if (recved == 0) {
return OKAY;
}
}
return AGAIN;
}
/* Returns the number of bytes flushed to the buffer */
ssize_t
evcom_stream_write (evcom_stream *stream, const char *str, size_t len)
{
if (!WRITABLE(stream) || GOT_CLOSE(stream)) {
assert(0 && "Do not write to a closed stream");
return -1;
}
ssize_t sent = 0;
if ( stream->send_action == stream_send__wait_for_buf
&& evcom_queue_empty(&stream->out)
)
{
assert(CONNECTED(stream));
#if EVCOM_HAVE_GNUTLS
if (SECURE(stream)) {
sent = gnutls_record_send(stream->session, str, len);
if (gnutls_error_is_fatal(sent)) {
stream->gnutls_errorno = sent;
goto close;
}
} else
#endif // EVCOM_HAVE_GNUTLS
{
/* TODO use writev() here? */
sent = nosigpipe_stream_send(stream, str, len);
}
if (sent < 0) {
switch (errno) {
case EPIPE:
goto close;
case EINTR:
case EAGAIN:
sent = 0;
break;
default:
stream->errorno = errno;
evcom_perror("send()", stream->errorno);
goto close;
}
}
} /* TODO else { memcpy to last buffer on head } */
assert(sent >= 0);
if ((size_t)sent == len) return sent; /* sent the whole buffer */
len -= sent;
str += sent;
evcom_buf *b = evcom_buf_new(str, len);
evcom_queue_insert_head(&stream->out, &b->queue);
b->written = 0;
assert(stream->sendfd >= 0);
if (ATTACHED(stream)) {
ev_io_start(D_LOOP_(stream) &stream->write_watcher);
}
return sent;
close:
stream->send_action = stream_send__close;
stream->recv_action = stream_recv__close;
if (ATTACHED(stream)) {
ev_io_start(D_LOOP_(stream) &stream->write_watcher);
}
return -1;
}