libwebsockets/lib/plat/esp32/esp32-sockets.c

/*
 * libwebsockets - lib/plat/lws-plat-esp32.c
 *
 * Copyright (C) 2010-2017 Andy Green <andy@warmcat.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation:
 *  version 2.1 of the License.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA  02110-1301  USA
 */

#include "core/private.h"
#include "freertos/timers.h"
#include <esp_attr.h>
#include <esp_system.h>

#include "apps/sntp/sntp.h"

#include <lwip/sockets.h>
#include <esp_task_wdt.h>

int
lws_send_pipe_choked(struct lws *wsi)
{
	struct lws *wsi_eff = wsi;
	fd_set writefds;
	struct timeval tv = { 0, 0 };
	int n;
#if defined(LWS_WITH_HTTP2)
	wsi_eff = lws_get_network_wsi(wsi);
#endif

	/* the fact we checked implies we avoided back-to-back writes */
	wsi_eff->could_have_pending = 0;

	/* treat the fact we got a truncated send pending as if we're choked */
	if (wsi_eff->trunc_len)
		return 1;

	FD_ZERO(&writefds);
	FD_SET(wsi_eff->desc.sockfd, &writefds);

	n = select(wsi_eff->desc.sockfd + 1, NULL, &writefds, NULL, &tv);
	if (n < 0)
		return 1; /* choked */

	return !n; /* n = 0 = not writable = choked */
}

int
lws_poll_listen_fd(struct lws_pollfd *fd)
{
	fd_set readfds;
	struct timeval tv = { 0, 0 };

	FD_ZERO(&readfds);
	FD_SET(fd->fd, &readfds);

	return select(fd->fd + 1, &readfds, NULL, NULL, &tv);
}

int
lws_plat_check_connection_error(struct lws *wsi)
{
	return 0;
}


int
lws_plat_set_socket_options(struct lws_vhost *vhost, int fd)
{
	int optval = 1;
	socklen_t optlen = sizeof(optval);

#if defined(__APPLE__) || \
    defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
    defined(__NetBSD__) || \
    defined(__OpenBSD__)
	struct protoent *tcp_proto;
#endif

	if (vhost->ka_time) {
		/* enable keepalive on this socket */
		optval = 1;
		if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
			       (const void *)&optval, optlen) < 0)
			return 1;

#if defined(__APPLE__) || \
    defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
    defined(__NetBSD__) || \
        defined(__CYGWIN__) || defined(__OpenBSD__) || defined (__sun)

		/*
		 * didn't find a way to set these per-socket, need to
		 * tune kernel systemwide values
		 */
#else
		/* set the keepalive conditions we want on it too */
		optval = vhost->ka_time;
		if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
			       (const void *)&optval, optlen) < 0)
			return 1;

		optval = vhost->ka_interval;
		if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
			       (const void *)&optval, optlen) < 0)
			return 1;

		optval = vhost->ka_probes;
		if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
			       (const void *)&optval, optlen) < 0)
			return 1;
#endif
	}

	/* Disable Nagle */
	optval = 1;
	if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &optval, optlen) < 0)
		return 1;

	/* We are nonblocking... */
	if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
		return 1;

	return 0;
}

/* cast a struct sockaddr_in6 * into addr for ipv6 */

int
lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
		    size_t addrlen)
{
#if 0
	int rc = LWS_ITOSA_NOT_EXIST;

	struct ifaddrs *ifr;
	struct ifaddrs *ifc;
#ifdef LWS_WITH_IPV6
	struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
#endif

	getifaddrs(&ifr);
	for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
		if (!ifc->ifa_addr)
			continue;

		lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);

		if (strcmp(ifc->ifa_name, ifname))
			continue;

		switch (ifc->ifa_addr->sa_family) {
		case AF_INET:
#ifdef LWS_WITH_IPV6
			if (ipv6) {
				/* map IPv4 to IPv6 */
				bzero((char *)&addr6->sin6_addr,
						sizeof(struct in6_addr));
				addr6->sin6_addr.s6_addr[10] = 0xff;
				addr6->sin6_addr.s6_addr[11] = 0xff;
				memcpy(&addr6->sin6_addr.s6_addr[12],
					&((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
							sizeof(struct in_addr));
			} else
#endif
				memcpy(addr,
					(struct sockaddr_in *)ifc->ifa_addr,
						    sizeof(struct sockaddr_in));
			break;
#ifdef LWS_WITH_IPV6
		case AF_INET6:
			memcpy(&addr6->sin6_addr,
			  &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
						       sizeof(struct in6_addr));
			break;
#endif
		default:
			continue;
		}
		rc = LWS_ITOSA_USABLE;
	}

	freeifaddrs(ifr);

	if (rc == LWS_ITOSA_NOT_EXIST) {
		/* check if bind to IP address */
#ifdef LWS_WITH_IPV6
		if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
			rc = LWS_ITOSA_USABLE;
		else
#endif
		if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
			rc = LWS_ITOSA_USABLE;
	}

	return rc;
#endif

	return LWS_ITOSA_NOT_EXIST;
}

const char *
lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
{
	return inet_ntop(af, src, dst, cnt);
}

int
lws_plat_inet_pton(int af, const char *src, void *dst)
{
	return 1; //  inet_pton(af, src, dst);
}