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https://github.com/warmcat/libwebsockets.git
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2cfa260e62
This is a NOP for existing usecases. At the moment the only implemented transport for serialized SS is wsi, it's typically used with Unix Domain Sockets, but it also works over tcp the same. It generalizes the interface between serialized chunks and the transport, separately for client and proxy. The wsi transport is migrated to use the new transport ops structs. It will then be possible to "bring your own transport", so long as it is reliable, and in-order, both for proxy and client / sspc. We also adapt minimal-secure-streams-binance to build the -client variant via SS proxy as well. LWS_ONLY_SSPC is added so libwebsockets can be produced with just sspc client support even for tiny targets. A new embedded minimal example for rpi pico is also provided that demonstrates using Serialized SS over a UART to an SS proxy, to implement the SS Binance example on the pico, even though it has no networking itself.
113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
/*
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* lws-minimal-secure-streams-custom-client-transport
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*
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* Written in 2010-2021 by Andy Green <andy@warmcat.com>
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*
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* This file is made available under the Creative Commons CC0 1.0
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* Universal Public Domain Dedication.
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*
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*
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* These are apis used inside liblws-sspc that must be wired up to the client
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* host platform.
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*
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* lws_sul_schedule() - use system event loop to schedule event in the future
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* lws_sul_cancel() - rescind a scheduled event
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* lws_now_usecs() - unix time in microseconds
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* __lws_logv() - core logging function used by liblws-sspc
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*/
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#include "private.h"
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#include <string.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <errno.h>
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int log_level = LLL_USER | LLL_ERR;// | LLL_WARN | LLL_NOTICE;
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static int
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sul_compare(const lws_dll2_t *d, const lws_dll2_t *i)
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{
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lws_usec_t a = ((lws_sorted_usec_list_t *)d)->us;
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lws_usec_t b = ((lws_sorted_usec_list_t *)i)->us;
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/*
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* Simply returning (a - b) in an int
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* may lead to an integer overflow bug
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*/
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if (a > b)
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return 1;
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if (a < b)
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return -1;
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return 0;
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}
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void
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lws_sul_schedule(struct lws_context_standalone *ctx, int tsi,
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lws_sorted_usec_list_t *sul, sul_cb_t _cb, lws_usec_t _us)
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{
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if (_us == (lws_usec_t)LWS_SET_TIMER_USEC_CANCEL) {
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lws_sul_cancel(sul);
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return;
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}
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lws_dll2_remove(&sul->list);
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sul->cb = _cb;
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sul->us = lws_now_usecs() + _us;
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lws_dll2_add_sorted(&sul->list, &a_cpcx.scheduler, sul_compare);
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}
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void
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lws_sul_cancel(lws_sorted_usec_list_t *sul)
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{
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lws_dll2_remove(&sul->list);
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sul->us = 0;
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}
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lws_usec_t
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lws_now_usecs(void)
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{
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#if defined(LWS_HAVE_CLOCK_GETTIME)
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts))
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return 0;
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return (((lws_usec_t)ts.tv_sec) * LWS_US_PER_SEC) +
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((lws_usec_t)ts.tv_nsec / LWS_NS_PER_US);
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#else
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struct timeval now;
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gettimeofday(&now, NULL);
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return (((lws_usec_t)now.tv_sec) * LWS_US_PER_SEC) +
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(lws_usec_t)now.tv_usec;
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#endif
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}
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/*
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* wire up lws-sspc logs to native application logs, we just wire it up to
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* stderr
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*/
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void
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__lws_logv(lws_log_cx_t *cx, lws_log_prepend_cx_t prep, void *obj,
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int filter, const char *_fun, const char *format, va_list ap)
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{
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char logbuf[200];
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int n;
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if (!(filter & log_level))
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return;
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n = vsnprintf(logbuf, sizeof(logbuf) - 2, format, ap);
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if (n > 0 && logbuf[n - 1] != '\n') {
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logbuf[n++] = '\n';
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logbuf[n] = '\0';
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}
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fprintf(stderr, "%llu: %s", (unsigned long long)lws_now_usecs(), logbuf);
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}
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