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249 lines
6.8 KiB
249 lines
6.8 KiB
/*
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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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static int
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secstream_mqtt(struct lws *wsi, enum lws_callback_reasons reason, void *user,
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void *in, size_t len)
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{
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lws_ss_handle_t *h = (lws_ss_handle_t *)lws_get_opaque_user_data(wsi);
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lws_mqtt_publish_param_t mqpp, *pmqpp;
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uint8_t buf[LWS_PRE + 1400];
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size_t buflen;
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int f = 0;
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switch (reason) {
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/* because we are protocols[0] ... */
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case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
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lwsl_info("%s: CLIENT_CONNECTION_ERROR: %s\n", __func__,
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in ? (char *)in : "(null)");
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if (!h)
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break;
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lws_ss_event_helper(h, LWSSSCS_UNREACHABLE);
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h->wsi = NULL;
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lws_ss_backoff(h);
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break;
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case LWS_CALLBACK_MQTT_CLIENT_CLOSED:
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if (!h)
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break;
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f = lws_ss_event_helper(h, LWSSSCS_DISCONNECTED);
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if (h->wsi)
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lws_set_opaque_user_data(h->wsi, NULL);
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h->wsi = NULL;
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if (f) {
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lws_ss_destroy(&h);
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break;
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}
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if (h->policy && !(h->policy->flags & LWSSSPOLF_OPPORTUNISTIC) &&
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!h->txn_ok && !wsi->context->being_destroyed)
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lws_ss_backoff(h);
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break;
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case LWS_CALLBACK_MQTT_CLIENT_ESTABLISHED:
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/*
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* Make sure the handle wsi points to the stream wsi not the
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* original nwsi, in the case it was migrated
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*/
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h->wsi = wsi;
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h->retry = 0;
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h->seqstate = SSSEQ_CONNECTED;
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lws_ss_set_timeout_us(h, LWS_SET_TIMER_USEC_CANCEL);
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lws_ss_event_helper(h, LWSSSCS_CONNECTED);
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if (h->policy->u.mqtt.topic)
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lws_callback_on_writable(wsi);
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break;
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case LWS_CALLBACK_MQTT_CLIENT_RX:
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// lwsl_user("LWS_CALLBACK_CLIENT_RECEIVE: read %d\n", (int)len);
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if (!h)
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return 0;
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pmqpp = (lws_mqtt_publish_param_t *)in;
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f = 0;
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if (!pmqpp->payload_pos)
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f |= LWSSS_FLAG_SOM;
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if (pmqpp->payload_pos + len == pmqpp->payload_len)
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f |= LWSSS_FLAG_EOM;
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h->subseq = 1;
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h->info.rx(ss_to_userobj(h), (const uint8_t *)pmqpp->payload,
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len, f);
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return 0; /* don't passthru */
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case LWS_CALLBACK_MQTT_SUBSCRIBED:
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wsi->mqtt->done_subscribe = 1;
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lws_callback_on_writable(wsi);
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break;
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case LWS_CALLBACK_MQTT_ACK:
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lws_ss_event_helper(h, LWSSSCS_QOS_ACK_REMOTE);
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break;
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case LWS_CALLBACK_MQTT_CLIENT_WRITEABLE:
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if (!h)
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return 0;
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lwsl_notice("%s: ss %p: WRITEABLE\n", __func__, h);
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if (h->seqstate != SSSEQ_CONNECTED) {
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lwsl_warn("%s: seqstate %d\n", __func__, h->seqstate);
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break;
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}
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if (h->policy->u.mqtt.subscribe && !wsi->mqtt->done_subscribe) {
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/*
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* The policy says to subscribe to something, and we
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* haven't done it yet
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*/
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lwsl_warn("%s: subscribing %s\n", __func__, h->policy->u.mqtt.subscribe);
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memset(&h->u.mqtt.sub_top, 0, sizeof(h->u.mqtt.sub_top));
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h->u.mqtt.sub_top.name = h->policy->u.mqtt.subscribe;
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h->u.mqtt.sub_top.qos = h->policy->u.mqtt.qos;
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memset(&h->u.mqtt.sub_info, 0, sizeof(h->u.mqtt.sub_info));
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h->u.mqtt.sub_info.num_topics = 1;
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h->u.mqtt.sub_info.topic = &h->u.mqtt.sub_top;
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if (lws_mqtt_client_send_subcribe(wsi, &h->u.mqtt.sub_info)) {
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lwsl_notice("%s: unable to subscribe", __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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buflen = sizeof(buf) - LWS_PRE;
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if (h->info.tx(ss_to_userobj(h), h->txord++, buf + LWS_PRE,
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&buflen, &f))
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/* don't want to send anything */
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return 0;
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memset(&mqpp, 0, sizeof(mqpp));
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mqpp.topic = (char *)h->policy->u.mqtt.topic;
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mqpp.topic_len = strlen(mqpp.topic);
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mqpp.packet_id = h->txord - 1;
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mqpp.payload = buf + LWS_PRE;
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if (h->writeable_len)
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mqpp.payload_len = h->writeable_len;
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else
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mqpp.payload_len = buflen;
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lwsl_notice("%s: payload len %d\n", __func__, (int)mqpp.payload_len);
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mqpp.qos = h->policy->u.mqtt.qos;
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if (lws_mqtt_client_send_publish(wsi, &mqpp,
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(const char *)buf + LWS_PRE, buflen,
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f & LWSSS_FLAG_EOM)) {
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lwsl_notice("%s: failed to publish\n", __func__);
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return -1;
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}
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return 0;
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default:
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break;
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}
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return lws_callback_http_dummy(wsi, reason, user, in, len);
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}
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const struct lws_protocols protocol_secstream_mqtt = {
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"lws-secstream-mqtt",
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secstream_mqtt,
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0,
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0,
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};
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/*
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* Munge connect info according to protocol-specific considerations... this
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* usually means interpreting aux in a protocol-specific way and using the
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* pieces at connection setup time, eg, http url pieces.
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*
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* len bytes of buf can be used for things with scope until after the actual
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* connect.
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*
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* For ws, protocol aux is <url path>;<ws subprotocol name>
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*/
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static int
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secstream_connect_munge_mqtt(lws_ss_handle_t *h, char *buf, size_t len,
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struct lws_client_connect_info *i,
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union lws_ss_contemp *ct)
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{
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memset(&ct->ccp, 0, sizeof(ct->ccp));
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ct->ccp.client_id = "lwsMqttClient";
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ct->ccp.keep_alive = h->policy->u.mqtt.keep_alive;
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ct->ccp.clean_start = h->policy->u.mqtt.clean_start;
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ct->ccp.will_param.topic = h->policy->u.mqtt.will_topic;
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ct->ccp.will_param.message = h->policy->u.mqtt.will_message;
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ct->ccp.will_param.qos = h->policy->u.mqtt.will_qos;
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ct->ccp.will_param.retain = h->policy->u.mqtt.will_retain;
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lwsl_notice("%s\n", __func__);
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h->u.mqtt.topic_qos.name = h->policy->u.mqtt.subscribe;
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h->u.mqtt.topic_qos.qos = h->policy->u.mqtt.qos;
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i->method = "MQTT";
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i->mqtt_cp = &ct->ccp;
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i->alpn = "x-amzn-mqtt-ca";
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/* share connections where possible */
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i->ssl_connection |= LCCSCF_PIPELINE;
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/*
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if (!h->policy->u.http.url)
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return 0;
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// protocol aux is the path part ; ws subprotocol name
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i->path = NULL;
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lws_snprintf(buf, len, "/%s", h->policy->u.mqtt.topic);
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// i->protocol = h->policy->u.mqtt.u.ws.subprotocol;
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lwsl_notice("%s: url %s, ws subprotocol %s\n", __func__, buf, i->protocol);
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*/
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return 0;
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}
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const struct ss_pcols ss_pcol_mqtt = {
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"MQTT",
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"x-amzn-mqtt-ca", //"mqtt/3.1.1",
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"lws-secstream-mqtt",
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secstream_connect_munge_mqtt
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};
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