lib/lws-plat-win.c

#ifndef _WINSOCK_DEPRECATED_NO_WARNINGS
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#endif
#include "private-libwebsockets.h"

unsigned long long
time_in_microseconds()
{
#define DELTA_EPOCH_IN_MICROSECS 11644473600000000ULL
	FILETIME filetime;
	ULARGE_INTEGER datetime;

#ifdef _WIN32_WCE
	GetCurrentFT(&filetime);
#else
	GetSystemTimeAsFileTime(&filetime);
#endif

	/*
	 * As per Windows documentation for FILETIME, copy the resulting FILETIME structure to a
	 * ULARGE_INTEGER structure using memcpy (using memcpy instead of direct assignment can
	 * prevent alignment faults on 64-bit Windows).
	 */
	memcpy(&datetime, &filetime, sizeof(datetime));

	/* Windows file times are in 100s of nanoseconds. */
	return (datetime.QuadPart - DELTA_EPOCH_IN_MICROSECS) / 10;
}

#ifdef _WIN32_WCE
time_t time(time_t *t)
{
	time_t ret = time_in_microseconds() / 1000000;
	*t = ret;
	return ret;
}
#endif

/* file descriptor hash management */

struct lws *
wsi_from_fd(const struct lws_context *context, lws_sockfd_type fd)
{
	int h = LWS_FD_HASH(fd);
	int n = 0;

	for (n = 0; n < context->fd_hashtable[h].length; n++)
		if (context->fd_hashtable[h].wsi[n]->sock == fd)
			return context->fd_hashtable[h].wsi[n];

	return NULL;
}

int
insert_wsi(struct lws_context *context, struct lws *wsi)
{
	int h = LWS_FD_HASH(wsi->sock);

	if (context->fd_hashtable[h].length == (getdtablesize() - 1)) {
		lwsl_err("hash table overflow\n");
		return 1;
	}

	context->fd_hashtable[h].wsi[context->fd_hashtable[h].length++] = wsi;

	return 0;
}

int
delete_from_fd(struct lws_context *context, lws_sockfd_type fd)
{
	int h = LWS_FD_HASH(fd);
	int n = 0;

	for (n = 0; n < context->fd_hashtable[h].length; n++)
		if (context->fd_hashtable[h].wsi[n]->sock == fd) {
			while (n < context->fd_hashtable[h].length) {
				context->fd_hashtable[h].wsi[n] =
					    context->fd_hashtable[h].wsi[n + 1];
				n++;
			}
			context->fd_hashtable[h].length--;

			return 0;
		}

	lwsl_err("Failed to find fd %d requested for "
		 "delete in hashtable\n", fd);
	return 1;
}

LWS_VISIBLE int lws_get_random(struct lws_context *context,
							     void *buf, int len)
{
	int n;
	char *p = (char *)buf;

	for (n = 0; n < len; n++)
		p[n] = (unsigned char)rand();

	return n;
}

LWS_VISIBLE int lws_send_pipe_choked(struct lws *wsi)
{
	return (int)wsi->sock_send_blocking;
}

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

	assert((fd->events & LWS_POLLIN) == LWS_POLLIN);

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

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

/**
 * lws_cancel_service() - Cancel servicing of pending websocket activity
 * @context:	Websocket context
 *
 *	This function let a call to lws_service() waiting for a timeout
 *	immediately return.
 */
LWS_VISIBLE void
lws_cancel_service(struct lws_context *context)
{
	struct lws_context_per_thread *pt = &context->pt[0];
	int n = context->count_threads;

	while (n--) {
		WSASetEvent(pt->events[0]);
		pt++;
	}
}

LWS_VISIBLE void
lws_cancel_service_pt(struct lws *wsi)
{
	struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
	WSASetEvent(pt->events[0]);
}

LWS_VISIBLE void lwsl_emit_syslog(int level, const char *line)
{
	lwsl_emit_stderr(level, line);
}

LWS_VISIBLE int
lws_plat_service_tsi(struct lws_context *context, int timeout_ms, int tsi)
{
	struct lws_context_per_thread *pt = &context->pt[tsi];
	WSANETWORKEVENTS networkevents;
	struct lws_pollfd *pfd;
	struct lws *wsi;
	unsigned int i;
	DWORD ev;
	int n, m;

	/* stay dead once we are dead */
	if (context == NULL)
		return 1;

	if (!context->service_tid_detected) {
		struct lws _lws;

		memset(&_lws, 0, sizeof(_lws));
		_lws.context = context;

		context->service_tid_detected = context->protocols[0].callback(
			&_lws, LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
	}
	context->service_tid = context->service_tid_detected;

	for (i = 0; i < pt->fds_count; ++i) {
		pfd = &pt->fds[i];
		if (pfd->fd == pt->lserv_fd)
			continue;

		if (pfd->events & LWS_POLLOUT) {
			wsi = wsi_from_fd(context, pfd->fd);
			if (!wsi || wsi->sock_send_blocking)
				continue;
			pfd->revents = LWS_POLLOUT;
			n = lws_service_fd(context, pfd);
			if (n < 0)
				return -1;
			/* if something closed, retry this slot */
			if (n)
				i--;
		}
	}

	/* if we know something needs service already, don't wait in poll */
	timeout_ms = lws_service_adjust_timeout(context, timeout_ms, tsi);

	ev = WSAWaitForMultipleEvents(pt->fds_count + 1, pt->events,
				      FALSE, timeout_ms, FALSE);
	context->service_tid = 0;

	if (ev == WSA_WAIT_TIMEOUT) {
		lws_service_fd(context, NULL);
		return 0;
	}

	if (ev == WSA_WAIT_EVENT_0) {
		WSAResetEvent(pt->events[0]);
		return 0;
	}

	if (ev < WSA_WAIT_EVENT_0 || ev > WSA_WAIT_EVENT_0 + pt->fds_count)
		return -1;

	pfd = &pt->fds[ev - WSA_WAIT_EVENT_0 - 1];

	/* eh... is one event at a time the best windows can do? */

	if (WSAEnumNetworkEvents(pfd->fd, pt->events[ev - WSA_WAIT_EVENT_0],
				 &networkevents) == SOCKET_ERROR) {
		lwsl_err("WSAEnumNetworkEvents() failed with error %d\n",
								     LWS_ERRNO);
		return -1;
	}

	pfd->revents = (short)networkevents.lNetworkEvents;

	if (pfd->revents & LWS_POLLOUT) {
		wsi = wsi_from_fd(context, pfd->fd);
		if (wsi)
			wsi->sock_send_blocking = 0;
	}

	/* if someone faked their LWS_POLLIN, then go through all active fds */

	if (lws_service_flag_pending(context, tsi)) {
		/* any socket with events to service? */
		for (n = 0; n < (int)pt->fds_count; n++) {
			if (!pt->fds[n].revents)
				continue;

			m = lws_service_fd_tsi(context, &pt->fds[n], tsi);
			if (m < 0)
				return -1;
			/* if something closed, retry this slot */
			if (m)
				n--;
		}
		return 0;
	}

	/* otherwise just do the one... must be a way to improve that... */

	return lws_service_fd_tsi(context, pfd, tsi);
}

LWS_VISIBLE int
lws_plat_service(struct lws_context *context, int timeout_ms)
{
	return lws_plat_service_tsi(context, timeout_ms, 0);
}

LWS_VISIBLE int
lws_plat_set_socket_options(struct lws_context *context, lws_sockfd_type fd)
{
	int optval = 1;
	int optlen = sizeof(optval);
	u_long optl = 1;
	DWORD dwBytesRet;
	struct tcp_keepalive alive;
	struct protoent *tcp_proto;

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

		alive.onoff = TRUE;
		alive.keepalivetime = context->ka_time;
		alive.keepaliveinterval = context->ka_interval;

		if (WSAIoctl(fd, SIO_KEEPALIVE_VALS, &alive, sizeof(alive),
					      NULL, 0, &dwBytesRet, NULL, NULL))
			return 1;
	}

	/* Disable Nagle */
	optval = 1;
	tcp_proto = getprotobyname("TCP");
	if (!tcp_proto) {
		lwsl_err("getprotobyname() failed with error %d\n", LWS_ERRNO);
		return 1;
	}

	setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, (const char *)&optval, optlen);

	/* We are nonblocking... */
	ioctlsocket(fd, FIONBIO, &optl);

	return 0;
}

LWS_VISIBLE void
lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
{
}

LWS_VISIBLE int
lws_plat_context_early_init(void)
{
	WORD wVersionRequested;
	WSADATA wsaData;
	int err;

	/* Use the MAKEWORD(lowbyte, highbyte) macro from Windef.h */
	wVersionRequested = MAKEWORD(2, 2);

	err = WSAStartup(wVersionRequested, &wsaData);
	if (!err)
		return 0;
	/*
	 * Tell the user that we could not find a usable
	 * Winsock DLL
	 */
	lwsl_err("WSAStartup failed with error: %d\n", err);

	return 1;
}

LWS_VISIBLE void
lws_plat_context_early_destroy(struct lws_context *context)
{
	struct lws_context_per_thread *pt = &context->pt[0];
	int n = context->count_threads;

	while (n--) {
		if (pt->events) {
			WSACloseEvent(pt->events[0]);
			lws_free(pt->events);
		}
		pt++;
	}
}

LWS_VISIBLE void
lws_plat_context_late_destroy(struct lws_context *context)
{
	int n;

	for (n = 0; n < FD_HASHTABLE_MODULUS; n++) {
		if (context->fd_hashtable[n].wsi)
			lws_free(context->fd_hashtable[n].wsi);
	}

	WSACleanup();
}

LWS_VISIBLE LWS_EXTERN int
lws_interface_to_sa(int ipv6,
		const char *ifname, struct sockaddr_in *addr, size_t addrlen)
{
	long long address = inet_addr(ifname);

	if (address == INADDR_NONE) {
		struct hostent *entry = gethostbyname(ifname);
		if (entry)
			address = ((struct in_addr *)entry->h_addr_list[0])->s_addr;
	}

	if (address == INADDR_NONE)
		return -1;

	addr->sin_addr.s_addr = (unsigned long)address;

	return 0;
}

LWS_VISIBLE void
lws_plat_insert_socket_into_fds(struct lws_context *context, struct lws *wsi)
{
	struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];

	pt->fds[pt->fds_count++].revents = 0;
	pt->events[pt->fds_count] = WSACreateEvent();
	WSAEventSelect(wsi->sock, pt->events[pt->fds_count],
		       LWS_POLLIN | LWS_POLLHUP);
}

LWS_VISIBLE void
lws_plat_delete_socket_from_fds(struct lws_context *context,
						struct lws *wsi, int m)
{
	struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];

	WSACloseEvent(pt->events[m + 1]);
	pt->events[m + 1] = pt->events[pt->fds_count--];
}

LWS_VISIBLE void
lws_plat_service_periodic(struct lws_context *context)
{
}

LWS_VISIBLE int
lws_plat_change_pollfd(struct lws_context *context,
		      struct lws *wsi, struct lws_pollfd *pfd)
{
	struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
	long networkevents = LWS_POLLHUP;

	if ((pfd->events & LWS_POLLIN))
		networkevents |= LWS_POLLIN;

	if ((pfd->events & LWS_POLLOUT))
		networkevents |= LWS_POLLOUT;

	if (WSAEventSelect(wsi->sock,
			pt->events[wsi->position_in_fds_table + 1],
					       networkevents) != SOCKET_ERROR)
		return 0;

	lwsl_err("WSAEventSelect() failed with error %d\n", LWS_ERRNO);

	return 1;
}

LWS_VISIBLE const char *
lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
{
	WCHAR *buffer;
	DWORD bufferlen = cnt;
	BOOL ok = FALSE;

	buffer = lws_malloc(bufferlen);
	if (!buffer) {
		lwsl_err("Out of memory\n");
		return NULL;
	}

	if (af == AF_INET) {
		struct sockaddr_in srcaddr;
		bzero(&srcaddr, sizeof(srcaddr));
		srcaddr.sin_family = AF_INET;
		memcpy(&(srcaddr.sin_addr), src, sizeof(srcaddr.sin_addr));

		if (!WSAAddressToStringW((struct sockaddr*)&srcaddr, sizeof(srcaddr), 0, buffer, &bufferlen))
			ok = TRUE;
#ifdef LWS_USE_IPV6
	} else if (af == AF_INET6) {
		struct sockaddr_in6 srcaddr;
		bzero(&srcaddr, sizeof(srcaddr));
		srcaddr.sin6_family = AF_INET6;
		memcpy(&(srcaddr.sin6_addr), src, sizeof(srcaddr.sin6_addr));

		if (!WSAAddressToStringW((struct sockaddr*)&srcaddr, sizeof(srcaddr), 0, buffer, &bufferlen))
			ok = TRUE;
#endif
	} else
		lwsl_err("Unsupported type\n");

	if (!ok) {
		int rv = WSAGetLastError();
		lwsl_err("WSAAddressToString() : %d\n", rv);
	} else {
		if (WideCharToMultiByte(CP_ACP, 0, buffer, bufferlen, dst, cnt, 0, NULL) <= 0)
			ok = FALSE;
	}

	lws_free(buffer);
	return ok ? dst : NULL;
}

static lws_filefd_type
_lws_plat_file_open(struct lws *wsi, const char *filename,
		    unsigned long *filelen, int flags)
{
	HANDLE ret;
	WCHAR buf[MAX_PATH];

	(void)wsi;
	MultiByteToWideChar(CP_UTF8, 0, filename, -1, buf, ARRAY_SIZE(buf));
	if ((flags & 7) == _O_RDONLY) {
		ret = CreateFileW(buf, GENERIC_READ, FILE_SHARE_READ,
			  NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	} else {
		lwsl_err("%s: open for write not implemented\n", __func__);
		*filelen = 0;
		return LWS_INVALID_FILE;
	}

	if (ret != LWS_INVALID_FILE)
		*filelen = GetFileSize(ret, NULL);

	return ret;
}

static int
_lws_plat_file_close(struct lws *wsi, lws_filefd_type fd)
{
	(void)wsi;

	CloseHandle((HANDLE)fd);

	return 0;
}

static unsigned long
_lws_plat_file_seek_cur(struct lws *wsi, lws_filefd_type fd, long offset)
{
	(void)wsi;

	return SetFilePointer((HANDLE)fd, offset, NULL, FILE_CURRENT);
}

static int
_lws_plat_file_read(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
		    unsigned char* buf, unsigned long len)
{
	DWORD _amount;

	(void *)wsi;
	if (!ReadFile((HANDLE)fd, buf, (DWORD)len, &_amount, NULL)) {
		*amount = 0;

		return 1;
	}

	*amount = (unsigned long)_amount;

	return 0;
}

static int
_lws_plat_file_write(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
		     unsigned char* buf, unsigned long len)
{
	(void)wsi;
	(void)fd;
	(void)amount;
	(void)buf;
	(void)len;

	lwsl_err("%s: not implemented yet on this platform\n", __func__);

	return -1;
}

LWS_VISIBLE int
lws_plat_init(struct lws_context *context,
	      struct lws_context_creation_info *info)
{
	struct lws_context_per_thread *pt = &context->pt[0];
	int i, n = context->count_threads;

	for (i = 0; i < FD_HASHTABLE_MODULUS; i++) {
		context->fd_hashtable[i].wsi =
			lws_zalloc(sizeof(struct lws*) * context->max_fds);

		if (!context->fd_hashtable[i].wsi)
			return -1;
	}

	while (n--) {
		pt->events = lws_malloc(sizeof(WSAEVENT) *
					(context->fd_limit_per_thread + 1));
		if (pt->events == NULL) {
			lwsl_err("Unable to allocate events array for %d connections\n",
					context->fd_limit_per_thread + 1);
			return 1;
		}

		pt->fds_count = 0;
		pt->events[0] = WSACreateEvent();

		pt++;
	}

	context->fd_random = 0;

	context->fops.open	= _lws_plat_file_open;
	context->fops.close	= _lws_plat_file_close;
	context->fops.seek_cur	= _lws_plat_file_seek_cur;
	context->fops.read	= _lws_plat_file_read;
	context->fops.write	= _lws_plat_file_write;

	return 0;
}