mirror of
https://github.com/warmcat/libwebsockets.git
synced 2025-03-16 00:00:07 +01:00
3a31c47fcd
On lwsws, incoming ws connections to the default vhost are not rejected by the dummy protocol handler and not really serviced either, leading to bots connecting to it to get immortal, idle ws connections with no timeout (since it's an established ws connection). Rejecting these connections by default by adding a handler for ESTABLISHED in the dummy handler will solve it nicely, but it will break an unknown number of dumb. protocol-less user implementations that rely on this behaviour by using break; from their own ESTABLISHED handler and calling through to the currently NOP dummy handler one. Add support to assertively disable the default protocol index used for subprotocol-less ws connections instead.
117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010-2018 Andy Green <andy@warmcat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation:
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <core/private.h>
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static int
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rops_handle_POLLIN_raw_file(struct lws_context_per_thread *pt, struct lws *wsi,
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struct lws_pollfd *pollfd)
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{
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int n;
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if (pollfd->revents & LWS_POLLOUT) {
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n = lws_callback_as_writeable(wsi);
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if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
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lwsl_info("failed at set pollfd\n");
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return LWS_HPI_RET_WSI_ALREADY_DIED;
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}
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if (n)
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return LWS_HPI_RET_PLEASE_CLOSE_ME;
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}
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if (pollfd->revents & LWS_POLLIN) {
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if (user_callback_handle_rxflow(wsi->protocol->callback,
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wsi, LWS_CALLBACK_RAW_RX_FILE,
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wsi->user_space, NULL, 0)) {
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lwsl_debug("raw rx callback closed it\n");
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return LWS_HPI_RET_PLEASE_CLOSE_ME;
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}
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}
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if (pollfd->revents & LWS_POLLHUP)
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return LWS_HPI_RET_PLEASE_CLOSE_ME;
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return LWS_HPI_RET_HANDLED;
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}
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//#if !defined(LWS_NO_SERVER)
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static int
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rops_adoption_bind_raw_file(struct lws *wsi, int type, const char *vh_prot_name)
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{
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/* no socket or http: it can only be a raw file */
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if ((type & LWS_ADOPT_HTTP) || (type & LWS_ADOPT_SOCKET) ||
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(type & _LWS_ADOPT_FINISH))
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return 0; /* no match */
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lws_role_transition(wsi, 0, LRS_ESTABLISHED, &role_ops_raw_file);
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if (!vh_prot_name) {
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if (wsi->vhost->default_protocol_index >=
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wsi->vhost->count_protocols)
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return 0;
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wsi->protocol = &wsi->vhost->protocols[
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wsi->vhost->default_protocol_index];
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}
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return 1; /* bound */
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}
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//#endif
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struct lws_role_ops role_ops_raw_file = {
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/* role name */ "raw-file",
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/* alpn id */ NULL,
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/* check_upgrades */ NULL,
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/* init_context */ NULL,
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/* init_vhost */ NULL,
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/* destroy_vhost */ NULL,
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/* periodic_checks */ NULL,
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/* service_flag_pending */ NULL,
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/* handle_POLLIN */ rops_handle_POLLIN_raw_file,
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/* handle_POLLOUT */ NULL,
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/* perform_user_POLLOUT */ NULL,
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/* callback_on_writable */ NULL,
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/* tx_credit */ NULL,
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/* write_role_protocol */ NULL,
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/* encapsulation_parent */ NULL,
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/* alpn_negotiated */ NULL,
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/* close_via_role_protocol */ NULL,
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/* close_role */ NULL,
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/* close_kill_connection */ NULL,
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/* destroy_role */ NULL,
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//#if !defined(LWS_NO_SERVER)
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/* adoption_bind */ rops_adoption_bind_raw_file,
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//#else
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// NULL,
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//#endif
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/* client_bind */ NULL,
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/* adoption_cb clnt, srv */ { LWS_CALLBACK_RAW_ADOPT_FILE,
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LWS_CALLBACK_RAW_ADOPT_FILE },
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/* rx_cb clnt, srv */ { LWS_CALLBACK_RAW_RX_FILE,
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LWS_CALLBACK_RAW_RX_FILE },
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/* writeable cb clnt, srv */ { LWS_CALLBACK_RAW_WRITEABLE_FILE, 0 },
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/* close cb clnt, srv */ { LWS_CALLBACK_RAW_CLOSE_FILE, 0 },
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/* protocol_bind cb c, srv */ { LWS_CALLBACK_RAW_FILE_BIND_PROTOCOL,
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LWS_CALLBACK_RAW_FILE_BIND_PROTOCOL },
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/* protocol_unbind cb c, srv */ { LWS_CALLBACK_RAW_FILE_DROP_PROTOCOL,
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LWS_CALLBACK_RAW_FILE_DROP_PROTOCOL },
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/* file_handle */ 1,
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};
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