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231 lines
6.7 KiB
231 lines
6.7 KiB
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <private-lib-core.h>
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static int
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rops_handle_POLLIN_raw_proxy(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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struct lws_tokens ebuf;
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int n, buffered;
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/* pending truncated sends have uber priority */
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if (lws_has_buffered_out(wsi)) {
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if (!(pollfd->revents & LWS_POLLOUT))
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return LWS_HPI_RET_HANDLED;
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/* drain the output buflist */
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if (lws_issue_raw(wsi, NULL, 0) < 0)
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goto fail;
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/*
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* we can't afford to allow input processing to send
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* something new, so spin around he event loop until
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* he doesn't have any partials
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*/
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return LWS_HPI_RET_HANDLED;
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}
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if ((pollfd->revents & pollfd->events & LWS_POLLIN) &&
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/* any tunnel has to have been established... */
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lwsi_state(wsi) != LRS_SSL_ACK_PENDING &&
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!(wsi->favoured_pollin &&
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(pollfd->revents & pollfd->events & LWS_POLLOUT))) {
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ebuf.token = NULL;
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ebuf.len = 0;
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buffered = lws_buflist_aware_read(pt, wsi, &ebuf, 1, __func__);
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if (buffered < 0)
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goto fail;
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switch (ebuf.len) {
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case 0:
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lwsl_info("%s: read 0 len\n", __func__);
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wsi->seen_zero_length_recv = 1;
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if (lws_change_pollfd(wsi, LWS_POLLIN, 0))
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goto fail;
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/*
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* we need to go to fail here, since it's the only
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* chance we get to understand that the socket has
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* closed
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*/
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// goto try_pollout;
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goto fail;
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case LWS_SSL_CAPABLE_ERROR:
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goto fail;
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case LWS_SSL_CAPABLE_MORE_SERVICE:
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goto try_pollout;
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}
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n = user_callback_handle_rxflow(wsi->protocol->callback,
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wsi, lwsi_role_client(wsi) ?
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LWS_CALLBACK_RAW_PROXY_CLI_RX :
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LWS_CALLBACK_RAW_PROXY_SRV_RX,
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wsi->user_space, ebuf.token,
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ebuf.len);
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if (n < 0) {
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lwsl_info("LWS_CALLBACK_RAW_PROXY_*_RX fail\n");
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goto fail;
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}
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if (lws_buflist_aware_finished_consuming(wsi, &ebuf, ebuf.len,
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buffered, __func__))
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return LWS_HPI_RET_PLEASE_CLOSE_ME;
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} else
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if (wsi->favoured_pollin &&
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(pollfd->revents & pollfd->events & LWS_POLLOUT))
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/* we balanced the last favouring of pollin */
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wsi->favoured_pollin = 0;
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try_pollout:
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if (!(pollfd->revents & LWS_POLLOUT))
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return LWS_HPI_RET_HANDLED;
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if (lws_handle_POLLOUT_event(wsi, pollfd)) {
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lwsl_debug("POLLOUT event closed it\n");
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return LWS_HPI_RET_PLEASE_CLOSE_ME;
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}
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#if defined(LWS_WITH_CLIENT)
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if (lws_client_socket_service(wsi, pollfd))
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return LWS_HPI_RET_WSI_ALREADY_DIED;
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#endif
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return LWS_HPI_RET_HANDLED;
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fail:
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lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS, "raw svc fail");
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return LWS_HPI_RET_WSI_ALREADY_DIED;
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}
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static int
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rops_adoption_bind_raw_proxy(struct lws *wsi, int type,
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const char *vh_prot_name)
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{
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/* no http but socket... must be raw skt */
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if ((type & LWS_ADOPT_HTTP) || !(type & LWS_ADOPT_SOCKET) ||
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(!(type & LWS_ADOPT_FLAG_RAW_PROXY)) || (type & _LWS_ADOPT_FINISH))
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return 0; /* no match */
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#if defined(LWS_WITH_UDP)
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if (type & LWS_ADOPT_FLAG_UDP)
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/*
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* these can be >128 bytes, so just alloc for UDP
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*/
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wsi->udp = lws_malloc(sizeof(*wsi->udp), "udp struct");
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#endif
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lws_role_transition(wsi, LWSIFR_SERVER, (type & LWS_ADOPT_ALLOW_SSL) ?
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LRS_SSL_INIT : LRS_ESTABLISHED,
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&role_ops_raw_proxy);
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if (vh_prot_name)
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lws_bind_protocol(wsi, wsi->protocol, __func__);
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else
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/* this is the only time he will transition */
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lws_bind_protocol(wsi,
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&wsi->vhost->protocols[wsi->vhost->raw_protocol_index],
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__func__);
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return 1; /* bound */
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}
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static int
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rops_client_bind_raw_proxy(struct lws *wsi,
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const struct lws_client_connect_info *i)
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{
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if (!i) {
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/* finalize */
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if (!wsi->user_space && wsi->stash->cis[CIS_METHOD])
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if (lws_ensure_user_space(wsi))
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return 1;
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return 0;
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}
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/* we are a fallback if nothing else matched */
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if (i->local_protocol_name && !strcmp(i->local_protocol_name, "raw-proxy"))
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lws_role_transition(wsi, LWSIFR_CLIENT, LRS_UNCONNECTED,
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&role_ops_raw_proxy);
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return 0;
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}
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static int
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rops_handle_POLLOUT_raw_proxy(struct lws *wsi)
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{
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if (lwsi_state(wsi) == LRS_ESTABLISHED)
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return LWS_HP_RET_USER_SERVICE;
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if (lwsi_role_client(wsi))
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return LWS_HP_RET_USER_SERVICE;
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return LWS_HP_RET_BAIL_OK;
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}
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const struct lws_role_ops role_ops_raw_proxy = {
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/* role name */ "raw-proxy",
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/* alpn id */ NULL,
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/* check_upgrades */ NULL,
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/* pt_init_destroy */ NULL,
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/* init_vhost */ NULL,
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/* destroy_vhost */ NULL,
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/* service_flag_pending */ NULL,
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/* handle_POLLIN */ rops_handle_POLLIN_raw_proxy,
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/* handle_POLLOUT */ rops_handle_POLLOUT_raw_proxy,
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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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/* adoption_bind */ rops_adoption_bind_raw_proxy,
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/* client_bind */ rops_client_bind_raw_proxy,
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/* issue_keepalive */ NULL,
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/* adoption_cb clnt, srv */ { LWS_CALLBACK_RAW_PROXY_CLI_ADOPT,
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LWS_CALLBACK_RAW_PROXY_SRV_ADOPT },
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/* rx_cb clnt, srv */ { LWS_CALLBACK_RAW_PROXY_CLI_RX,
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LWS_CALLBACK_RAW_PROXY_SRV_RX },
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/* writeable cb clnt, srv */ { LWS_CALLBACK_RAW_PROXY_CLI_WRITEABLE,
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LWS_CALLBACK_RAW_PROXY_SRV_WRITEABLE, },
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/* close cb clnt, srv */ { LWS_CALLBACK_RAW_PROXY_CLI_CLOSE,
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LWS_CALLBACK_RAW_PROXY_SRV_CLOSE },
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/* protocol_bind cb c, srv */ { LWS_CALLBACK_RAW_PROXY_CLI_BIND_PROTOCOL,
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LWS_CALLBACK_RAW_PROXY_SRV_BIND_PROTOCOL },
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/* protocol_unbind cb c, srv */ { LWS_CALLBACK_RAW_PROXY_CLI_DROP_PROTOCOL,
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LWS_CALLBACK_RAW_PROXY_SRV_DROP_PROTOCOL },
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/* file_handle */ 0,
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};
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