mirror of
https://github.com/warmcat/libwebsockets.git
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a60cb84c9e
Implement Captive Portal detection support in lws, with the actual detection happening in platform code hooked up by lws_system_ops_t. Add an implementation using Secure Streams as well, if the policy defines captive_portal_detect streamtype, a SS using that streamtype is used to probe if it's behind a captive portal.
111 lines
3 KiB
C
111 lines
3 KiB
C
/*
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* Captive portal detect for Secure Streams
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*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2019 - 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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typedef struct ss_cpd {
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struct lws_ss_handle *ss;
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void *opaque_data;
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/* ... application specific state ... */
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lws_sorted_usec_list_t sul;
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uint8_t partway;
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} ss_cpd_t;
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/* secure streams payload interface */
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static int
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ss_cpd_rx(void *userobj, const uint8_t *buf, size_t len, int flags)
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{
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return 0;
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}
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static int
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ss_cpd_tx(void *userobj, lws_ss_tx_ordinal_t ord, uint8_t *buf,
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size_t *len, int *flags)
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{
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return 1;
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}
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static int
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ss_cpd_state(void *userobj, void *sh, lws_ss_constate_t state,
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lws_ss_tx_ordinal_t ack)
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{
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ss_cpd_t *m = (ss_cpd_t *)userobj;
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struct lws_context *cx = (struct lws_context *)m->opaque_data;
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lwsl_info("%s: %s, ord 0x%x\n", __func__, lws_ss_state_name(state),
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(unsigned int)ack);
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switch (state) {
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case LWSSSCS_CREATING:
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lws_ss_request_tx(m->ss);
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break;
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case LWSSSCS_QOS_ACK_REMOTE:
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lws_system_cpd_set(cx, LWS_CPD_INTERNET_OK);
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break;
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case LWSSSCS_ALL_RETRIES_FAILED:
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case LWSSSCS_DISCONNECTED:
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/*
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* First result reported sticks... if nothing else, this will
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* cover the situation we didn't connect to anything
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*/
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lws_system_cpd_set(cx, LWS_CPD_NO_INTERNET);
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break;
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default:
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break;
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}
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return 0;
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}
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int
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lws_ss_sys_cpd(struct lws_context *cx)
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{
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lws_ss_info_t ssi;
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/* We're making an outgoing secure stream ourselves */
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memset(&ssi, 0, sizeof(ssi));
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ssi.handle_offset = offsetof(ss_cpd_t, ss);
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ssi.opaque_user_data_offset = offsetof(ss_cpd_t, opaque_data);
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ssi.rx = ss_cpd_rx;
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ssi.tx = ss_cpd_tx;
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ssi.state = ss_cpd_state;
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ssi.user_alloc = sizeof(ss_cpd_t);
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ssi.streamtype = "captive_portal_detect";
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if (lws_ss_create(cx, 0, &ssi, cx, NULL, NULL, NULL)) {
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lwsl_info("%s: Create stream failed (policy?)\n", __func__);
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return 1;
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}
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return 0;
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}
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