LWS_VISIBLE int
lws_ssl_capable_read(struct libwebsocket_context *context,
struct libwebsocket *wsi, unsigned char *buf, int len)
{
int n;
if (!wsi->ssl)
return lws_ssl_capable_read_no_ssl(context, wsi, buf, len);
wsi->buffered_reads_pending = 0;
n = SSL_read(wsi->ssl, buf, len);
if (n >= 0) {
/*
* if it was our buffer that limited what we read,
* check if SSL has additional data pending inside SSL buffers.
*
* Because these won't signal at the network layer with POLLIN
* and if we don't realize, this data will sit there forever
*/
if (n == len && wsi->ssl && SSL_pending(wsi->ssl)) {
context->ssl_flag_buffered_reads = 1;
wsi->buffered_reads_pending = 1;
}
return n;
}
n = SSL_get_error(wsi->ssl, n);
if (n == SSL_ERROR_WANT_READ || n == SSL_ERROR_WANT_WRITE)
return LWS_SSL_CAPABLE_MORE_SERVICE;
return LWS_SSL_CAPABLE_ERROR;
}
LWS_VISIBLE int
lws_ssl_capable_read(struct lws *wsi, unsigned char *buf, int len)
{
struct lws_context *context = wsi->context;
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
int n;
if (!wsi->ssl)
return lws_ssl_capable_read_no_ssl(wsi, buf, len);
n = SSL_read(wsi->ssl, buf, len);
/* manpage: returning 0 means connection shut down */
if (!n)
return LWS_SSL_CAPABLE_ERROR;
if (n < 0) {
n = SSL_get_error(wsi->ssl, n);
if (n == SSL_ERROR_WANT_READ || n == SSL_ERROR_WANT_WRITE)
return LWS_SSL_CAPABLE_MORE_SERVICE;
return LWS_SSL_CAPABLE_ERROR;
}
/*
* if it was our buffer that limited what we read,
* check if SSL has additional data pending inside SSL buffers.
*
* Because these won't signal at the network layer with POLLIN
* and if we don't realize, this data will sit there forever
*/
if (n != len)
goto bail;
if (!wsi->ssl)
goto bail;
if (!SSL_pending(wsi->ssl))
goto bail;
if (wsi->pending_read_list_next)
return n;
if (wsi->pending_read_list_prev)
return n;
if (pt->pending_read_list == wsi)
return n;
/* add us to the linked list of guys with pending ssl */
if (pt->pending_read_list)
pt->pending_read_list->pending_read_list_prev = wsi;
wsi->pending_read_list_next = pt->pending_read_list;
wsi->pending_read_list_prev = NULL;
pt->pending_read_list = wsi;
return n;
bail:
lws_ssl_remove_wsi_from_buffered_list(wsi);
return n;
}
LWS_VISIBLE int
lws_ssl_capable_read(struct libwebsocket_context *context,
struct libwebsocket *wsi, unsigned char *buf, int len)
{
int n;
if (!wsi->ssl)
return lws_ssl_capable_read_no_ssl(context, wsi, buf, len);
n = SSL_read(wsi->ssl, buf, len);
if (n >= 0) {
/*
* if it was our buffer that limited what we read,
* check if SSL has additional data pending inside SSL buffers.
*
* Because these won't signal at the network layer with POLLIN
* and if we don't realize, this data will sit there forever
*/
if (n == len && wsi->ssl && SSL_pending(wsi->ssl)) {
if (!wsi->pending_read_list_next && !wsi->pending_read_list_prev) {
if (context->pending_read_list != wsi) {
/* add us to the linked list of guys with pending ssl */
if (context->pending_read_list)
context->pending_read_list->pending_read_list_prev = wsi;
wsi->pending_read_list_next = context->pending_read_list;
wsi->pending_read_list_prev = NULL;
context->pending_read_list = wsi;
}
}
} else
lws_ssl_remove_wsi_from_buffered_list(context, wsi);
return n;
}
n = SSL_get_error(wsi->ssl, n);
if (n == SSL_ERROR_WANT_READ || n == SSL_ERROR_WANT_WRITE)
return LWS_SSL_CAPABLE_MORE_SERVICE;
return LWS_SSL_CAPABLE_ERROR;
}
LWS_VISIBLE int
lws_ssl_capable_read(struct lws *wsi, unsigned char *buf, int len)
{
struct lws_context *context = wsi->context;
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
int n = 0, m;
if (!wsi->ssl)
return lws_ssl_capable_read_no_ssl(wsi, buf, len);
lws_stats_atomic_bump(context, pt, LWSSTATS_C_API_READ, 1);
errno = 0;
n = SSL_read(wsi->ssl, buf, len);
#if defined(LWS_WITH_ESP32)
if (!n && errno == ENOTCONN) {
lwsl_debug("%p: SSL_read ENOTCONN\n", wsi);
return LWS_SSL_CAPABLE_ERROR;
}
#endif
#if defined(LWS_WITH_STATS)
if (!wsi->seen_rx) {
lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_MS_SSL_RX_DELAY,
time_in_microseconds() - wsi->accept_start_us);
lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_SSL_CONNS_HAD_RX, 1);
wsi->seen_rx = 1;
}
#endif
lwsl_debug("%p: SSL_read says %d\n", wsi, n);
/* manpage: returning 0 means connection shut down */
if (!n || (n == -1 && errno == ENOTCONN)) {
wsi->socket_is_permanently_unusable = 1;
return LWS_SSL_CAPABLE_ERROR;
}
if (n < 0) {
m = lws_ssl_get_error(wsi, n);
lwsl_debug("%p: ssl err %d errno %d\n", wsi, m, errno);
if (m == SSL_ERROR_ZERO_RETURN ||
m == SSL_ERROR_SYSCALL)
return LWS_SSL_CAPABLE_ERROR;
if (m == SSL_ERROR_WANT_READ || SSL_want_read(wsi->ssl)) {
lwsl_debug("%s: WANT_READ\n", __func__);
lwsl_debug("%p: LWS_SSL_CAPABLE_MORE_SERVICE\n", wsi);
return LWS_SSL_CAPABLE_MORE_SERVICE;
}
if (m == SSL_ERROR_WANT_WRITE || SSL_want_write(wsi->ssl)) {
lwsl_debug("%s: WANT_WRITE\n", __func__);
lwsl_debug("%p: LWS_SSL_CAPABLE_MORE_SERVICE\n", wsi);
return LWS_SSL_CAPABLE_MORE_SERVICE;
}
wsi->socket_is_permanently_unusable = 1;
return LWS_SSL_CAPABLE_ERROR;
}
lws_stats_atomic_bump(context, pt, LWSSTATS_B_READ, n);
if (wsi->vhost)
wsi->vhost->conn_stats.rx += n;
lws_restart_ws_ping_pong_timer(wsi);
/*
* if it was our buffer that limited what we read,
* check if SSL has additional data pending inside SSL buffers.
*
* Because these won't signal at the network layer with POLLIN
* and if we don't realize, this data will sit there forever
*/
if (n != len)
goto bail;
if (!wsi->ssl)
goto bail;
if (!SSL_pending(wsi->ssl))
goto bail;
if (wsi->pending_read_list_next)
return n;
if (wsi->pending_read_list_prev)
return n;
if (pt->pending_read_list == wsi)
return n;
/* add us to the linked list of guys with pending ssl */
if (pt->pending_read_list)
pt->pending_read_list->pending_read_list_prev = wsi;
wsi->pending_read_list_next = pt->pending_read_list;
wsi->pending_read_list_prev = NULL;
pt->pending_read_list = wsi;
return n;
bail:
lws_ssl_remove_wsi_from_buffered_list(wsi);
return n;
}
LWS_VISIBLE int
lws_ssl_capable_read(struct lws *wsi, unsigned char *buf, int len)
{
struct lws_context *context = wsi->context;
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
int n = 0, m;
if (!wsi->tls.ssl)
return lws_ssl_capable_read_no_ssl(wsi, buf, len);
lws_stats_atomic_bump(context, pt, LWSSTATS_C_API_READ, 1);
errno = 0;
n = SSL_read(wsi->tls.ssl, buf, len);
#if defined(LWS_WITH_ESP32)
if (!n && errno == LWS_ENOTCONN) {
lwsl_debug("%p: SSL_read ENOTCONN\n", wsi);
return LWS_SSL_CAPABLE_ERROR;
}
#endif
#if defined(LWS_WITH_STATS)
if (!wsi->seen_rx && wsi->accept_start_us) {
lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_MS_SSL_RX_DELAY,
lws_time_in_microseconds() - wsi->accept_start_us);
lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_SSL_CONNS_HAD_RX, 1);
wsi->seen_rx = 1;
}
#endif
lwsl_debug("%p: SSL_read says %d\n", wsi, n);
/* manpage: returning 0 means connection shut down
*
* 2018-09-10: https://github.com/openssl/openssl/issues/1903
*
* So, in summary, if you get a 0 or -1 return from SSL_read() /
* SSL_write(), you should call SSL_get_error():
*
* - If you get back SSL_ERROR_RETURN_ZERO then you know the connection
* has been cleanly shutdown by the peer. To fully close the
* connection you may choose to call SSL_shutdown() to send a
* close_notify back.
*
* - If you get back SSL_ERROR_SSL then some kind of internal or
* protocol error has occurred. More details will be on the SSL error
* queue. You can also call SSL_get_shutdown(). If this indicates a
* state of SSL_RECEIVED_SHUTDOWN then you know a fatal alert has
* been received from the peer (if it had been a close_notify then
* SSL_get_error() would have returned SSL_ERROR_RETURN_ZERO).
* SSL_ERROR_SSL is considered fatal - you should not call
* SSL_shutdown() in this case.
*
* - If you get back SSL_ERROR_SYSCALL then some kind of fatal (i.e.
* non-retryable) error has occurred in a system call.
*/
if (n <= 0) {
m = lws_ssl_get_error(wsi, n);
lwsl_debug("%p: ssl err %d errno %d\n", wsi, m, errno);
if (m == SSL_ERROR_ZERO_RETURN) /* cleanly shut down */
return LWS_SSL_CAPABLE_ERROR;
/* hm not retryable.. could be 0 size pkt or error */
if (m == SSL_ERROR_SSL || m == SSL_ERROR_SYSCALL ||
errno == LWS_ENOTCONN) {
/* unclean, eg closed conn */
wsi->socket_is_permanently_unusable = 1;
return LWS_SSL_CAPABLE_ERROR;
}
/* retryable? */
if (SSL_want_read(wsi->tls.ssl)) {
lwsl_debug("%s: WANT_READ\n", __func__);
lwsl_debug("%p: LWS_SSL_CAPABLE_MORE_SERVICE\n", wsi);
return LWS_SSL_CAPABLE_MORE_SERVICE;
}
if (SSL_want_write(wsi->tls.ssl)) {
lwsl_debug("%s: WANT_WRITE\n", __func__);
lwsl_debug("%p: LWS_SSL_CAPABLE_MORE_SERVICE\n", wsi);
return LWS_SSL_CAPABLE_MORE_SERVICE;
}
/* keep on trucking it seems */
}
lws_stats_atomic_bump(context, pt, LWSSTATS_B_READ, n);
if (wsi->vhost)
wsi->vhost->conn_stats.rx += n;
// lwsl_hexdump_err(buf, n);
/*
* if it was our buffer that limited what we read,
* check if SSL has additional data pending inside SSL buffers.
*
* Because these won't signal at the network layer with POLLIN
* and if we don't realize, this data will sit there forever
*/
if (n != len)
goto bail;
if (!wsi->tls.ssl)
goto bail;
if (!SSL_pending(wsi->tls.ssl))
goto bail;
if (wsi->tls.pending_read_list_next)
return n;
if (wsi->tls.pending_read_list_prev)
return n;
if (pt->tls.pending_read_list == wsi)
return n;
/* add us to the linked list of guys with pending ssl */
if (pt->tls.pending_read_list)
pt->tls.pending_read_list->tls.pending_read_list_prev = wsi;
wsi->tls.pending_read_list_next = pt->tls.pending_read_list;
wsi->tls.pending_read_list_prev = NULL;
pt->tls.pending_read_list = wsi;
return n;
bail:
lws_ssl_remove_wsi_from_buffered_list(wsi);
return n;
}
