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336 lines
8.9 KiB
336 lines
8.9 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 - 2020 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_skt(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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#if defined(LWS_WITH_SOCKS5)
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const char *cce = NULL;
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#endif
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struct lws_tokens ebuf;
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int n = 0, buffered = 0;
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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 defined(LWS_WITH_SERVER)
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if (!lwsi_role_client(wsi) && lwsi_state(wsi) != LRS_ESTABLISHED) {
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lwsl_debug("%s: %p: wsistate 0x%x\n", __func__, wsi,
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(int)wsi->wsistate);
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if (lwsi_state(wsi) != LRS_SSL_INIT)
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if (lws_server_socket_service_ssl(wsi,
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LWS_SOCK_INVALID))
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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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#endif
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if ((pollfd->revents & pollfd->events & LWS_POLLIN) &&
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!(wsi->favoured_pollin &&
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(pollfd->revents & pollfd->events & LWS_POLLOUT))) {
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lwsl_debug("%s: POLLIN: wsi %p, state 0x%x\n", __func__,
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wsi, lwsi_state(wsi));
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switch (lwsi_state(wsi)) {
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/* any tunnel has to have been established... */
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case LRS_SSL_ACK_PENDING:
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goto nope;
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/* we are actually connected */
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case LRS_WAITING_CONNECT:
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goto nope;
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#if defined(LWS_WITH_SOCKS5)
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/* SOCKS Greeting Reply */
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case LRS_WAITING_SOCKS_GREETING_REPLY:
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case LRS_WAITING_SOCKS_AUTH_REPLY:
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case LRS_WAITING_SOCKS_CONNECT_REPLY:
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switch (lws_socks5c_handle_state(wsi, pollfd, &cce)) {
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case LW5CHS_RET_RET0:
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goto nope;
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case LW5CHS_RET_BAIL3:
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lws_inform_client_conn_fail(wsi, (void *)cce, strlen(cce));
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goto fail;
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case LW5CHS_RET_STARTHS:
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lwsi_set_state(wsi, LRS_ESTABLISHED);
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lws_client_connect_4_established(wsi, NULL, 0);
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/*
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* Now we got the socks5 connection, we need to
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* go down the tls path on it now if that's what
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* we want
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*/
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goto post_rx;
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default:
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break;
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}
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goto post_rx;
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#endif
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default:
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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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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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#if defined(LWS_WITH_UDP)
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if (wsi->context->udp_loss_sim_rx_pc) {
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uint16_t u16;
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/*
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* We should randomly drop some of these
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*/
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if (lws_get_random(wsi->context, &u16, 2) == 2 &&
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((u16 * 100) / 0xffff) <=
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wsi->context->udp_loss_sim_rx_pc) {
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lwsl_warn("%s: dropping udp rx\n", __func__);
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/* pretend it was handled */
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n = ebuf.len;
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goto post_rx;
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}
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}
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#endif
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n = user_callback_handle_rxflow(wsi->protocol->callback,
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wsi, LWS_CALLBACK_RAW_RX,
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wsi->user_space, ebuf.token,
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ebuf.len);
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#if defined(LWS_WITH_UDP) || defined(LWS_WITH_SOCKS5)
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post_rx:
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#endif
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if (n < 0) {
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lwsl_info("LWS_CALLBACK_RAW_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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goto try_pollout;
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}
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}
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nope:
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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 defined(LWS_WITH_CLIENT)
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if (lwsi_state(wsi) == LRS_WAITING_CONNECT &&
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!lws_client_connect_3_connect(wsi, NULL, NULL, 0, NULL))
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return LWS_HPI_RET_WSI_ALREADY_DIED;
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#endif
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/* one shot */
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if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
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lwsl_notice("%s a\n", __func__);
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goto fail;
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}
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/* clear back-to-back write detection */
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wsi->could_have_pending = 0;
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lws_stats_bump(pt, LWSSTATS_C_WRITEABLE_CB, 1);
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#if defined(LWS_WITH_STATS)
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if (wsi->active_writable_req_us) {
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uint64_t ul = lws_now_usecs() -
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wsi->active_writable_req_us;
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lws_stats_bump(pt, LWSSTATS_US_WRITABLE_DELAY_AVG, ul);
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lws_stats_max(pt,
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LWSSTATS_US_WORST_WRITABLE_DELAY, ul);
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wsi->active_writable_req_us = 0;
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}
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#endif
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n = user_callback_handle_rxflow(wsi->protocol->callback,
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wsi, LWS_CALLBACK_RAW_WRITEABLE,
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wsi->user_space, NULL, 0);
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if (n < 0) {
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lwsl_info("writeable_fail\n");
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goto fail;
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}
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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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#if defined(LWS_WITH_SERVER)
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static int
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rops_adoption_bind_raw_skt(struct lws *wsi, int type, 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_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, 0, (type & LWS_ADOPT_ALLOW_SSL) ? LRS_SSL_INIT :
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LRS_ESTABLISHED, &role_ops_raw_skt);
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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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#endif
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#if defined(LWS_WITH_CLIENT)
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static int
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rops_client_bind_raw_skt(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 ||
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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_skt);
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return 1; /* matched */
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}
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#endif
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const struct lws_role_ops role_ops_raw_skt = {
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/* role name */ "raw-skt",
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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_skt,
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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_WITH_SERVER)
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/* adoption_bind */ rops_adoption_bind_raw_skt,
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#else
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NULL,
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#endif
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#if defined(LWS_WITH_CLIENT)
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/* client_bind */ rops_client_bind_raw_skt,
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#else
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NULL,
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#endif
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/* issue_keepalive */ NULL,
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/* adoption_cb clnt, srv */ { LWS_CALLBACK_RAW_CONNECTED,
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LWS_CALLBACK_RAW_ADOPT },
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/* rx_cb clnt, srv */ { LWS_CALLBACK_RAW_RX,
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LWS_CALLBACK_RAW_RX },
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/* writeable cb clnt, srv */ { LWS_CALLBACK_RAW_WRITEABLE,
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LWS_CALLBACK_RAW_WRITEABLE},
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/* close cb clnt, srv */ { LWS_CALLBACK_RAW_CLOSE,
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LWS_CALLBACK_RAW_CLOSE },
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/* protocol_bind cb c, srv */ { LWS_CALLBACK_RAW_SKT_BIND_PROTOCOL,
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LWS_CALLBACK_RAW_SKT_BIND_PROTOCOL },
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/* protocol_unbind cb c, srv */ { LWS_CALLBACK_RAW_SKT_DROP_PROTOCOL,
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LWS_CALLBACK_RAW_SKT_DROP_PROTOCOL },
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/* file_handle */ 0,
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};
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