libwebsockets/lib/roles/h2/http2.c

/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010-2018 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"

/*
 * bitmap of control messages that are valid to receive for each http2 state
 */

static const uint16_t http2_rx_validity[] = {
	/* LWS_H2S_IDLE */
		(1 << LWS_H2_FRAME_TYPE_SETTINGS) |
		(1 << LWS_H2_FRAME_TYPE_PRIORITY) |
//		(1 << LWS_H2_FRAME_TYPE_WINDOW_UPDATE)| /* ignore */
		(1 << LWS_H2_FRAME_TYPE_HEADERS) |
		(1 << LWS_H2_FRAME_TYPE_CONTINUATION),
	/* LWS_H2S_RESERVED_LOCAL */
		(1 << LWS_H2_FRAME_TYPE_SETTINGS) |
		(1 << LWS_H2_FRAME_TYPE_RST_STREAM) |
		(1 << LWS_H2_FRAME_TYPE_PRIORITY) |
		(1 << LWS_H2_FRAME_TYPE_WINDOW_UPDATE),
	/* LWS_H2S_RESERVED_REMOTE */
		(1 << LWS_H2_FRAME_TYPE_SETTINGS) |
		(1 << LWS_H2_FRAME_TYPE_HEADERS) |
		(1 << LWS_H2_FRAME_TYPE_CONTINUATION) |
		(1 << LWS_H2_FRAME_TYPE_RST_STREAM) |
		(1 << LWS_H2_FRAME_TYPE_PRIORITY),
	/* LWS_H2S_OPEN */
		(1 << LWS_H2_FRAME_TYPE_DATA) |
		(1 << LWS_H2_FRAME_TYPE_HEADERS) |
		(1 << LWS_H2_FRAME_TYPE_PRIORITY) |
		(1 << LWS_H2_FRAME_TYPE_RST_STREAM) |
		(1 << LWS_H2_FRAME_TYPE_SETTINGS) |
		(1 << LWS_H2_FRAME_TYPE_PUSH_PROMISE) |
		(1 << LWS_H2_FRAME_TYPE_PING) |
		(1 << LWS_H2_FRAME_TYPE_GOAWAY) |
		(1 << LWS_H2_FRAME_TYPE_WINDOW_UPDATE) |
		(1 << LWS_H2_FRAME_TYPE_CONTINUATION),
	/* LWS_H2S_HALF_CLOSED_REMOTE */
		(1 << LWS_H2_FRAME_TYPE_SETTINGS) |
		(1 << LWS_H2_FRAME_TYPE_WINDOW_UPDATE) |
		(1 << LWS_H2_FRAME_TYPE_PRIORITY) |
		(1 << LWS_H2_FRAME_TYPE_RST_STREAM),
	/* LWS_H2S_HALF_CLOSED_LOCAL */
		(1 << LWS_H2_FRAME_TYPE_DATA) |
		(1 << LWS_H2_FRAME_TYPE_HEADERS) |
		(1 << LWS_H2_FRAME_TYPE_PRIORITY) |
		(1 << LWS_H2_FRAME_TYPE_RST_STREAM) |
		(1 << LWS_H2_FRAME_TYPE_SETTINGS) |
		(1 << LWS_H2_FRAME_TYPE_PUSH_PROMISE) |
		(1 << LWS_H2_FRAME_TYPE_PING) |
		(1 << LWS_H2_FRAME_TYPE_GOAWAY) |
		(1 << LWS_H2_FRAME_TYPE_WINDOW_UPDATE) |
		(1 << LWS_H2_FRAME_TYPE_CONTINUATION),
	/* LWS_H2S_CLOSED */
		(1 << LWS_H2_FRAME_TYPE_SETTINGS) |
		(1 << LWS_H2_FRAME_TYPE_PRIORITY) |
		(1 << LWS_H2_FRAME_TYPE_WINDOW_UPDATE) |
		(1 << LWS_H2_FRAME_TYPE_RST_STREAM),
};

static const char *preface = "PRI * HTTP/2.0\x0d\x0a\x0d\x0aSM\x0d\x0a\x0d\x0a";

static const char * const h2_state_names[] = {
	"LWS_H2S_IDLE",
	"LWS_H2S_RESERVED_LOCAL",
	"LWS_H2S_RESERVED_REMOTE",
	"LWS_H2S_OPEN",
	"LWS_H2S_HALF_CLOSED_REMOTE",
	"LWS_H2S_HALF_CLOSED_LOCAL",
	"LWS_H2S_CLOSED",
};

#if 0
static const char * const h2_setting_names[] = {
	"",
	"H2SET_HEADER_TABLE_SIZE",
	"H2SET_ENABLE_PUSH",
	"H2SET_MAX_CONCURRENT_STREAMS",
	"H2SET_INITIAL_WINDOW_SIZE",
	"H2SET_MAX_FRAME_SIZE",
	"H2SET_MAX_HEADER_LIST_SIZE",
	"reserved",
	"H2SET_ENABLE_CONNECT_PROTOCOL"
};

void
lws_h2_dump_settings(struct http2_settings *set)
{
	int n;

	for (n = 1; n < H2SET_COUNT; n++)
		lwsl_notice("   %30s: %10d\n", h2_setting_names[n], set->s[n]);
}
#else
void
lws_h2_dump_settings(struct http2_settings *set)
{
}
#endif

static struct lws_h2_protocol_send *
lws_h2_new_pps(enum lws_h2_protocol_send_type type)
{
	struct lws_h2_protocol_send *pps = lws_malloc(sizeof(*pps), "pps");

	if (pps)
		pps->type = type;

	return pps;
}

void lws_h2_init(struct lws *wsi)
{
	wsi->h2.h2n->set = wsi->vhost->h2.set;
}

void
lws_h2_state(struct lws *wsi, enum lws_h2_states s)
{
	if (!wsi)
		return;
	lwsl_info("%s: wsi %p: state %s -> %s\n", __func__, wsi,
			h2_state_names[wsi->h2.h2_state],
			h2_state_names[s]);
		
	(void)h2_state_names;
	wsi->h2.h2_state = (uint8_t)s;
}

struct lws *
lws_wsi_server_new(struct lws_vhost *vh, struct lws *parent_wsi,
			    unsigned int sid)
{
	struct lws *wsi;
	struct lws *nwsi = lws_get_network_wsi(parent_wsi);
	struct lws_h2_netconn *h2n = nwsi->h2.h2n;

	/*
	 * The identifier of a newly established stream MUST be numerically
   	 * greater than all streams that the initiating endpoint has opened or
   	 * reserved.  This governs streams that are opened using a HEADERS frame
   	 * and streams that are reserved using PUSH_PROMISE.  An endpoint that
   	 * receives an unexpected stream identifier MUST respond with a
   	 * connection error (Section 5.4.1) of type PROTOCOL_ERROR.
	 */
	if (sid <= h2n->highest_sid_opened) {
		lwsl_info("%s: tried to open lower sid %d\n", __func__, sid);
		lws_h2_goaway(nwsi, H2_ERR_PROTOCOL_ERROR, "Bad sid");
		return NULL;
	}

	/* no more children allowed by parent */
	if (parent_wsi->h2.child_count + 1 >
	    parent_wsi->h2.h2n->set.s[H2SET_MAX_CONCURRENT_STREAMS]) {
		lwsl_notice("reached concurrent stream limit\n");
		return NULL;
	}
	wsi = lws_create_new_server_wsi(vh, parent_wsi->tsi);
	if (!wsi) {
		lwsl_notice("new server wsi failed (vh %p)\n", vh);
		return NULL;
	}

	h2n->highest_sid_opened = sid;
	wsi->h2.my_sid = sid;
	wsi->http2_substream = 1;
	wsi->seen_nonpseudoheader = 0;

	wsi->h2.parent_wsi = parent_wsi;
	wsi->role_ops = parent_wsi->role_ops;
	/* new guy's sibling is whoever was the first child before */
	wsi->h2.sibling_list = parent_wsi->h2.child_list;
	/* first child is now the new guy */
	parent_wsi->h2.child_list = wsi;
	parent_wsi->h2.child_count++;

	wsi->h2.my_priority = 16;
	wsi->h2.tx_cr = nwsi->h2.h2n->set.s[H2SET_INITIAL_WINDOW_SIZE];
	wsi->h2.peer_tx_cr_est =
			nwsi->vhost->h2.set.s[H2SET_INITIAL_WINDOW_SIZE];

	lwsi_set_state(wsi, LRS_ESTABLISHED);
	lwsi_set_role(wsi, lwsi_role(parent_wsi));

	wsi->protocol = &vh->protocols[0];
	if (lws_ensure_user_space(wsi))
		goto bail1;

	wsi->vhost->conn_stats.h2_subs++;

	lwsl_info("%s: %p new ch %p, sid %d, usersp=%p, tx cr %d, "
		  "peer_credit %d (nwsi tx_cr %d)\n",
		  __func__, parent_wsi, wsi, sid, wsi->user_space,
		  wsi->h2.tx_cr, wsi->h2.peer_tx_cr_est, nwsi->h2.tx_cr);

	return wsi;

bail1:
	/* undo the insert */
	parent_wsi->h2.child_list = wsi->h2.sibling_list;
	parent_wsi->h2.child_count--;

	vh->context->count_wsi_allocated--;

	if (wsi->user_space)
		lws_free_set_NULL(wsi->user_space);
	vh->protocols[0].callback(wsi, LWS_CALLBACK_WSI_DESTROY, NULL, NULL, 0);
	lws_vhost_unbind_wsi(wsi);
	lws_free(wsi);

	return NULL;
}

struct lws *
lws_wsi_h2_adopt(struct lws *parent_wsi, struct lws *wsi)
{
	struct lws *nwsi = lws_get_network_wsi(parent_wsi);

	/* no more children allowed by parent */
	if (parent_wsi->h2.child_count + 1 >
	    parent_wsi->h2.h2n->set.s[H2SET_MAX_CONCURRENT_STREAMS]) {
		lwsl_notice("reached concurrent stream limit\n");
		return NULL;
	}

	/* sid is set just before issuing the headers, ensuring monoticity */

	wsi->seen_nonpseudoheader = 0;
#if !defined(LWS_NO_CLIENT)
	wsi->client_h2_substream = 1;
#endif
	wsi->h2.initialized = 1;

	wsi->h2.parent_wsi = parent_wsi;
	/* new guy's sibling is whoever was the first child before */
	wsi->h2.sibling_list = parent_wsi->h2.child_list;
	/* first child is now the new guy */
	parent_wsi->h2.child_list = wsi;
	parent_wsi->h2.child_count++;

	wsi->h2.my_priority = 16;
	wsi->h2.tx_cr = nwsi->h2.h2n->set.s[H2SET_INITIAL_WINDOW_SIZE];
	wsi->h2.peer_tx_cr_est =
			nwsi->vhost->h2.set.s[H2SET_INITIAL_WINDOW_SIZE];

	if (lws_ensure_user_space(wsi))
		goto bail1;

	lws_role_transition(wsi, LWSIFR_CLIENT, LRS_H2_WAITING_TO_SEND_HEADERS,
			    &role_ops_h2);

	lws_callback_on_writable(wsi);

	wsi->vhost->conn_stats.h2_subs++;

	return wsi;

bail1:
	/* undo the insert */
	parent_wsi->h2.child_list = wsi->h2.sibling_list;
	parent_wsi->h2.child_count--;

	if (wsi->user_space)
		lws_free_set_NULL(wsi->user_space);
	wsi->protocol->callback(wsi, LWS_CALLBACK_WSI_DESTROY, NULL, NULL, 0);
	lws_free(wsi);

	return NULL;
}


int lws_h2_issue_preface(struct lws *wsi)
{
	struct lws_h2_netconn *h2n = wsi->h2.h2n;
	struct lws_h2_protocol_send *pps;

	if (lws_issue_raw(wsi, (uint8_t *)preface, strlen(preface)) !=
		(int)strlen(preface))
		return 1;

	lws_role_transition(wsi, LWSIFR_CLIENT, LRS_H2_WAITING_TO_SEND_HEADERS,
			    &role_ops_h2);

	h2n->count = 0;
	wsi->h2.tx_cr = 65535;

	/*
	 * we must send a settings frame
	 */
	pps = lws_h2_new_pps(LWS_H2_PPS_MY_SETTINGS);
	if (!pps)
		return 1;
	lws_pps_schedule(wsi, pps);
	lwsl_info("%s: h2 client sending settings\n", __func__);

	return 0;
}

struct lws *
lws_h2_wsi_from_id(struct lws *parent_wsi, unsigned int sid)
{
	lws_start_foreach_ll(struct lws *, wsi, parent_wsi->h2.child_list) {
		if (wsi->h2.my_sid == sid)
			return wsi;
	} lws_end_foreach_ll(wsi, h2.sibling_list);

	return NULL;
}

int lws_remove_server_child_wsi(struct lws_context *context, struct lws *wsi)
{
	lws_start_foreach_llp(struct lws **, w, wsi->h2.child_list) {
		if (*w == wsi) {
			*w = wsi->h2.sibling_list;
			(wsi->h2.parent_wsi)->h2.child_count--;
			return 0;
		}
	} lws_end_foreach_llp(w, h2.sibling_list);

	lwsl_err("%s: can't find %p\n", __func__, wsi);

	return 1;
}

void
lws_pps_schedule(struct lws *wsi, struct lws_h2_protocol_send *pps)
{
	struct lws *nwsi = lws_get_network_wsi(wsi);
	struct lws_h2_netconn *h2n = nwsi->h2.h2n;

	pps->next = h2n->pps;
	h2n->pps = pps;
	lws_rx_flow_control(wsi, LWS_RXFLOW_REASON_APPLIES_DISABLE |
				 LWS_RXFLOW_REASON_H2_PPS_PENDING);
	lws_callback_on_writable(wsi);
}

int
lws_h2_goaway(struct lws *wsi, uint32_t err, const char *reason)
{
	struct lws_h2_netconn *h2n = wsi->h2.h2n;
	struct lws_h2_protocol_send *pps;

	if (h2n->type == LWS_H2_FRAME_TYPE_COUNT)
		return 0;

	pps = lws_h2_new_pps(LWS_H2_PPS_GOAWAY);
	if (!pps)
		return 1;

	lwsl_info("%s: %p: ERR 0x%x, '%s'\n", __func__, wsi, err, reason);

	pps->u.ga.err = err;
	pps->u.ga.highest_sid = h2n->highest_sid;
	lws_strncpy(pps->u.ga.str, reason, sizeof(pps->u.ga.str));
	lws_pps_schedule(wsi, pps);

	h2n->type = LWS_H2_FRAME_TYPE_COUNT; /* ie, IGNORE */

	return 0;
}

int
lws_h2_rst_stream(struct lws *wsi, uint32_t err, const char *reason)
{
	struct lws *nwsi = lws_get_network_wsi(wsi);
	struct lws_h2_netconn *h2n = nwsi->h2.h2n;
	struct lws_h2_protocol_send *pps;

	if (!h2n)
		return 0;

	if (!wsi->h2_stream_carries_ws && h2n->type == LWS_H2_FRAME_TYPE_COUNT)
		return 0;

	pps = lws_h2_new_pps(LWS_H2_PPS_RST_STREAM);
	if (!pps)
		return 1;

	lwsl_info("%s: RST_STREAM 0x%x, sid %d, REASON '%s'\n", __func__, err,
			wsi->h2.my_sid, reason);

	pps->u.rs.sid = wsi->h2.my_sid;
	pps->u.rs.err = err;

	lws_pps_schedule(wsi, pps);

	h2n->type = LWS_H2_FRAME_TYPE_COUNT; /* ie, IGNORE */
	lws_h2_state(wsi, LWS_H2_STATE_CLOSED);

	return 0;
}

int
lws_h2_settings(struct lws *wsi, struct http2_settings *settings,
			unsigned char *buf, int len)
{
	struct lws *nwsi = lws_get_network_wsi(wsi);
	unsigned int a, b;

	if (!len)
		return 0;

	if (len < LWS_H2_SETTINGS_LEN)
		return 1;

	while (len >= LWS_H2_SETTINGS_LEN) {
		a = (buf[0] << 8) | buf[1];
		if (!a || a >= H2SET_COUNT)
			goto skip;
		b = buf[2] << 24 | buf[3] << 16 | buf[4] << 8 | buf[5];

		switch (a) {
		case H2SET_HEADER_TABLE_SIZE:
			break;
		case H2SET_ENABLE_PUSH:
			if (b > 1) {
				lws_h2_goaway(nwsi, H2_ERR_PROTOCOL_ERROR,
					      "ENABLE_PUSH invalid arg");
				return 1;
			}
			break;
		case H2SET_MAX_CONCURRENT_STREAMS:
			break;
		case H2SET_INITIAL_WINDOW_SIZE:
			if (b > 0x7fffffff) {
				lws_h2_goaway(nwsi, H2_ERR_FLOW_CONTROL_ERROR,
					      "Inital Window beyond max");
				return 1;
			}

#if defined(LWS_AMAZON_RTOS) || defined(LWS_AMAZON_LINUX)
			//FIXME: Workaround for FIRMWARE-4632 until cloud-side issue is fixed.
			if (b == 0x7fffffff) {
				b = 65535;
				lwsl_info("init window size 0x7fffffff\n");
				break;
			}
			//FIXME: end of FIRMWARE-4632 workaround
#endif

			/*
			 * In addition to changing the flow-control window for
			 * streams that are not yet active, a SETTINGS frame
			 * can alter the initial flow-control window size for
			 * streams with active flow-control windows (that is,
			 * streams in the "open" or "half-closed (remote)"
			 * state).  When the value of
			 * SETTINGS_INITIAL_WINDOW_SIZE changes, a receiver
			 * MUST adjust the size of all stream flow-control
			 * windows that it maintains by the difference between
			 * the new value and the old value.
			 */

			lws_start_foreach_ll(struct lws *, w,
					     nwsi->h2.child_list) {
				lwsl_info("%s: adi child tc cr %d +%d -> %d",
					    __func__,
					    w->h2.tx_cr, b - settings->s[a],
					    w->h2.tx_cr + b - settings->s[a]);
				w->h2.tx_cr += b - settings->s[a];
				if (w->h2.tx_cr > 0 &&
				    w->h2.tx_cr <=
						  (int32_t)(b - settings->s[a]))
					lws_callback_on_writable(w);
			} lws_end_foreach_ll(w, h2.sibling_list);

			break;
		case H2SET_MAX_FRAME_SIZE:
			if (b < wsi->vhost->h2.set.s[H2SET_MAX_FRAME_SIZE]) {
				lws_h2_goaway(nwsi, H2_ERR_PROTOCOL_ERROR,
					      "Frame size < initial");
				return 1;
			}
			if (b > 0x00ffffff) {
				lws_h2_goaway(nwsi, H2_ERR_PROTOCOL_ERROR,
					      "Settings Frame size above max");
				return 1;
			}
			break;
		case H2SET_MAX_HEADER_LIST_SIZE:
			break;
		}
		settings->s[a] = b;
		lwsl_info("http2 settings %d <- 0x%x\n", a, b);
skip:
		len -= LWS_H2_SETTINGS_LEN;
		buf += LWS_H2_SETTINGS_LEN;
	}

	if (len)
		return 1;

	lws_h2_dump_settings(settings);

	return 0;
}

/* RFC7640 Sect 6.9
 *
 * The WINDOW_UPDATE frame can be specific to a stream or to the entire
 * connection.  In the former case, the frame's stream identifier
 * indicates the affected stream; in the latter, the value "0" indicates
 * that the entire connection is the subject of the frame.
 *
 * ...
 *
 * Two flow-control windows are applicable: the stream flow-control
 * window and the connection flow-control window.  The sender MUST NOT
 * send a flow-controlled frame with a length that exceeds the space
 * available in either of the flow-control windows advertised by the
 * receiver.  Frames with zero length with the END_STREAM flag set (that
 * is, an empty DATA frame) MAY be sent if there is no available space
 * in either flow-control window.
 */

int
lws_h2_tx_cr_get(struct lws *wsi)
{
	int c = wsi->h2.tx_cr;
	struct lws *nwsi;

	if (!wsi->http2_substream && !wsi->upgraded_to_http2)
		return ~0x80000000;

	nwsi = lws_get_network_wsi(wsi);

	lwsl_info ("%s: %p: own tx credit %d: nwsi credit %d\n",
		     __func__, wsi, c, nwsi->h2.tx_cr);

	if (nwsi->h2.tx_cr < c)
		c = nwsi->h2.tx_cr;

	if (c < 0)
		return 0;

	return c;
}

void
lws_h2_tx_cr_consume(struct lws *wsi, int consumed)
{
	struct lws *nwsi = lws_get_network_wsi(wsi);

	wsi->h2.tx_cr -= consumed;

	if (nwsi != wsi)
		nwsi->h2.tx_cr -= consumed;
}

int lws_h2_frame_write(struct lws *wsi, int type, int flags,
		       unsigned int sid, unsigned int len, unsigned char *buf)
{
	struct lws *nwsi = lws_get_network_wsi(wsi);
	unsigned char *p = &buf[-LWS_H2_FRAME_HEADER_LENGTH];
	int n;

	//if (wsi->h2_stream_carries_ws)
	// lwsl_hexdump_level(LLL_NOTICE, buf, len);

	*p++ = len >> 16;
	*p++ = len >> 8;
	*p++ = len;
	*p++ = type;
	*p++ = flags;
	*p++ = sid >> 24;
	*p++ = sid >> 16;
	*p++ = sid >> 8;
	*p++ = sid;

	lwsl_debug("%s: %p (eff %p). typ %d, fl 0x%x, sid=%d, len=%d, "
		   "txcr=%d, nwsi->txcr=%d\n", __func__, wsi, nwsi, type, flags,
		   sid, len, wsi->h2.tx_cr, nwsi->h2.tx_cr);

	if (type == LWS_H2_FRAME_TYPE_DATA) {
		if (wsi->h2.tx_cr < (int)len)
			lwsl_err("%s: %p: sending payload len %d"
				 " but tx_cr only %d!\n", __func__, wsi,
				 len, wsi->h2.tx_cr);
		lws_h2_tx_cr_consume(wsi, len);
	}

	n = lws_issue_raw(nwsi, &buf[-LWS_H2_FRAME_HEADER_LENGTH],
			  len + LWS_H2_FRAME_HEADER_LENGTH);
	if (n < 0)
		return n;

	if (n >= LWS_H2_FRAME_HEADER_LENGTH)
		return n - LWS_H2_FRAME_HEADER_LENGTH;

	return n;
}

static void lws_h2_set_bin(struct lws *wsi, int n, unsigned char *buf)
{
	*buf++ = n >> 8;
	*buf++ = n;
	*buf++ = wsi->h2.h2n->set.s[n] >> 24;
	*buf++ = wsi->h2.h2n->set.s[n] >> 16;
	*buf++ = wsi->h2.h2n->set.s[n] >> 8;
	*buf = wsi->h2.h2n->set.s[n];
}

/* we get called on the network connection */

int lws_h2_do_pps_send(struct lws *wsi)
{
	struct lws_h2_netconn *h2n = wsi->h2.h2n;
	struct lws_h2_protocol_send *pps = NULL;
	struct lws *cwsi;
	uint8_t set[LWS_PRE + 64], *p = &set[LWS_PRE], *q;
	int n, m = 0, flags = 0;

	if (!h2n)
		return 1;

	/* get the oldest pps */

	lws_start_foreach_llp(struct lws_h2_protocol_send **, pps1, h2n->pps) {
		if ((*pps1)->next == NULL) { /* we are the oldest in the list */
			pps = *pps1; /* remove us from the list */
			*pps1 = NULL;
			continue;
		}
	} lws_end_foreach_llp(pps1, next);

	if (!pps)
		return 1;

	lwsl_info("%s: %p: %d\n", __func__, wsi, pps->type);

	switch (pps->type) {

	case LWS_H2_PPS_MY_SETTINGS:

		/*
		 * if any of our settings varies from h2 "default defaults"
		 * then we must inform the peer
		 */
		for (n = 1; n < H2SET_COUNT; n++)
			if (h2n->set.s[n] != lws_h2_defaults.s[n]) {
				lwsl_debug("sending SETTING %d 0x%x\n", n,
						wsi->h2.h2n->set.s[n]);
				lws_h2_set_bin(wsi, n, &set[LWS_PRE + m]);
				m += sizeof(h2n->one_setting);
			}
		n = lws_h2_frame_write(wsi, LWS_H2_FRAME_TYPE_SETTINGS,
				       flags, LWS_H2_STREAM_ID_MASTER, m,
		     		       &set[LWS_PRE]);
		if (n != m) {
			lwsl_info("send %d %d\n", n, m);
			goto bail;
		}
		break;

	case LWS_H2_PPS_ACK_SETTINGS:
		/* send ack ... always empty */
		n = lws_h2_frame_write(wsi, LWS_H2_FRAME_TYPE_SETTINGS, 1,
				       LWS_H2_STREAM_ID_MASTER, 0,
				       &set[LWS_PRE]);
		if (n) {
			lwsl_err("ack tells %d\n", n);
			goto bail;
		}
		/* this is the end of the preface dance then? */
		if (lwsi_state(wsi) == LRS_H2_AWAIT_SETTINGS) {
			lwsi_set_state(wsi, LRS_ESTABLISHED);
			wsi->http.fop_fd = NULL;
			if (lws_is_ssl(lws_get_network_wsi(wsi)))
				break;
			/*
			 * we need to treat the headers from the upgrade as the
			 * first job.  So these need to get shifted to sid 1.
			 */
			h2n->swsi = lws_wsi_server_new(wsi->vhost, wsi, 1);
			if (!h2n->swsi)
				goto bail;

			/* pass on the initial headers to SID 1 */
			h2n->swsi->http.ah = wsi->http.ah;
			wsi->http.ah = NULL;

			lwsl_info("%s: inherited headers %p\n", __func__,
				  h2n->swsi->http.ah);
			h2n->swsi->h2.tx_cr =
				h2n->set.s[H2SET_INITIAL_WINDOW_SIZE];
			lwsl_info("initial tx credit on conn %p: %d\n",
				  h2n->swsi, h2n->swsi->h2.tx_cr);
			h2n->swsi->h2.initialized = 1;
			/* demanded by HTTP2 */
			h2n->swsi->h2.END_STREAM = 1;
			lwsl_info("servicing initial http request\n");

			wsi->vhost->conn_stats.h2_trans++;

			if (lws_http_action(h2n->swsi))
				goto bail;

			break;
		}
		break;
	case LWS_H2_PPS_PONG:
		lwsl_debug("sending PONG\n");
		memcpy(&set[LWS_PRE], pps->u.ping.ping_payload, 8);
		n = lws_h2_frame_write(wsi, LWS_H2_FRAME_TYPE_PING,
		     		       LWS_H2_FLAG_SETTINGS_ACK,
				       LWS_H2_STREAM_ID_MASTER, 8,
				       &set[LWS_PRE]);
		if (n != 8) {
			lwsl_info("send %d %d\n", n, m);
			goto bail;
		}
		break;

	case LWS_H2_PPS_GOAWAY:
		lwsl_info("LWS_H2_PPS_GOAWAY\n");
		*p++ = pps->u.ga.highest_sid >> 24;
		*p++ = pps->u.ga.highest_sid >> 16;
		*p++ = pps->u.ga.highest_sid >> 8;
		*p++ = pps->u.ga.highest_sid;
		*p++ = pps->u.ga.err >> 24;
		*p++ = pps->u.ga.err >> 16;
		*p++ = pps->u.ga.err >> 8;
		*p++ = pps->u.ga.err;
		q = (unsigned char *)pps->u.ga.str;
		n = 0;
		while (*q && n++ < (int)sizeof(pps->u.ga.str))
			*p++ = *q++;
		h2n->we_told_goaway = 1;
		n = lws_h2_frame_write(wsi, LWS_H2_FRAME_TYPE_GOAWAY, 0,
				       LWS_H2_STREAM_ID_MASTER,
				       lws_ptr_diff(p, &set[LWS_PRE]),
				       &set[LWS_PRE]);
		if (n != 4) {
			lwsl_info("send %d %d\n", n, m);
			goto bail;
		}
		goto bail;

	case LWS_H2_PPS_RST_STREAM:
		lwsl_info("LWS_H2_PPS_RST_STREAM\n");
		*p++ = pps->u.rs.err >> 24;
		*p++ = pps->u.rs.err >> 16;
		*p++ = pps->u.rs.err >> 8;
		*p++ = pps->u.rs.err;
		n = lws_h2_frame_write(wsi, LWS_H2_FRAME_TYPE_RST_STREAM,
				       0, pps->u.rs.sid, 4, &set[LWS_PRE]);
		if (n != 4) {
			lwsl_info("send %d %d\n", n, m);
			goto bail;
		}
		cwsi = lws_h2_wsi_from_id(wsi, pps->u.rs.sid);
		if (cwsi) {
			lwsl_debug("%s: closing cwsi %p %s %s (wsi %p)\n",
				   __func__, cwsi, cwsi->role_ops->name,
				   cwsi->protocol->name, wsi);
			lws_close_free_wsi(cwsi, 0, "reset stream");
		}
		break;

	case LWS_H2_PPS_UPDATE_WINDOW:
		lwsl_debug("Issuing LWS_H2_PPS_UPDATE_WINDOW: sid %d: add %d\n",
			    pps->u.update_window.sid,
			    pps->u.update_window.credit);
		*p++ = pps->u.update_window.credit >> 24;
		*p++ = pps->u.update_window.credit >> 16;
		*p++ = pps->u.update_window.credit >> 8;
		*p++ = pps->u.update_window.credit;
		n = lws_h2_frame_write(wsi, LWS_H2_FRAME_TYPE_WINDOW_UPDATE,
				       0, pps->u.update_window.sid, 4,
				       &set[LWS_PRE]);
		if (n != 4) {
			lwsl_info("send %d %d\n", n, m);
			goto bail;
		}
		break;

	default:
		break;
	}

	lws_free(pps);

	return 0;

bail:
	lws_free(pps);

	return 1;
}

/*
 * The frame header part has just completely arrived.
 * Perform actions for header completion.
 */
static int
lws_h2_parse_frame_header(struct lws *wsi)
{
	struct lws_h2_netconn *h2n = wsi->h2.h2n;
	struct lws_h2_protocol_send *pps;
	int n;

	/*
	 * We just got the frame header
	 */
	h2n->count = 0;
	h2n->swsi = wsi;
	/* b31 is a reserved bit */
	h2n->sid = h2n->sid & 0x7fffffff;

	if (h2n->sid && !(h2n->sid & 1)) {
		lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR, "Even Stream ID");

		return 0;
	}

	/* let the network wsi live a bit longer if subs are active */

	if (!wsi->immortal_substream_count)
#if defined(LWS_AMAZON_RTOS) || defined(LWS_AMAZON_LINUX)
		lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE, wsi->vhost->keepalive_timeout);
#else
		lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE, 31);
#endif

	if (h2n->sid)
		h2n->swsi = lws_h2_wsi_from_id(wsi, h2n->sid);

	lwsl_debug("%p (%p): fr hdr: typ 0x%x, fla 0x%x, sid 0x%x, len 0x%x\n",
		  wsi, h2n->swsi, h2n->type, h2n->flags, h2n->sid,
		  h2n->length);

	if (h2n->we_told_goaway && h2n->sid > h2n->highest_sid)
		h2n->type = LWS_H2_FRAME_TYPE_COUNT; /* ie, IGNORE */

	if (h2n->type == LWS_H2_FRAME_TYPE_COUNT)
		return 0;

	if (h2n->length > h2n->set.s[H2SET_MAX_FRAME_SIZE]) {
		/*
		 * peer sent us something bigger than we told
		 * it we would allow
		 */
		lwsl_info("received oversize frame %d\n", h2n->length);
		lws_h2_goaway(wsi, H2_ERR_FRAME_SIZE_ERROR,
			      "Peer ignored our frame size setting");
		return 1;
	}

	if (h2n->swsi)
		lwsl_info("%s: wsi %p, State: %s, received cmd %d\n",
		  __func__, h2n->swsi,
		  h2_state_names[h2n->swsi->h2.h2_state], h2n->type);
	else {
		/* if it's data, either way no swsi means CLOSED state */
		if (h2n->type == LWS_H2_FRAME_TYPE_DATA) {
			if (h2n->sid <= h2n->highest_sid_opened
#if !defined(LWS_NO_CLIENT)
					&& wsi->client_h2_alpn
#endif
			) {
				lwsl_notice("ignoring straggling data\n");
				/* ie, IGNORE */
				h2n->type = LWS_H2_FRAME_TYPE_COUNT;
			} else {
				lws_h2_goaway(wsi, H2_ERR_STREAM_CLOSED,
				      "Data for nonexistent sid");
				return 0;
			}
		}
		/* if the sid is credible, treat as wsi for it closed */
		if (h2n->sid > h2n->highest_sid_opened &&
		    h2n->type != LWS_H2_FRAME_TYPE_HEADERS &&
		    h2n->type != LWS_H2_FRAME_TYPE_PRIORITY) {
			/* if not credible, reject it */
			lwsl_info("%s: wsi %p, No child for sid %d, rxcmd %d\n",
			  __func__, h2n->swsi, h2n->sid, h2n->type);
			lws_h2_goaway(wsi, H2_ERR_STREAM_CLOSED,
				     "Data for nonexistent sid");
			return 0;
		}
	}

	if (h2n->swsi && h2n->sid &&
	    !(http2_rx_validity[h2n->swsi->h2.h2_state] & (1 << h2n->type))) {
		lwsl_info("%s: wsi %p, State: %s, ILLEGAL cmdrx %d (OK 0x%x)\n",
			  __func__, h2n->swsi,
			  h2_state_names[h2n->swsi->h2.h2_state], h2n->type,
			  http2_rx_validity[h2n->swsi->h2.h2_state]);

		if (h2n->swsi->h2.h2_state == LWS_H2_STATE_CLOSED ||
		    h2n->swsi->h2.h2_state == LWS_H2_STATE_HALF_CLOSED_REMOTE)
			n = H2_ERR_STREAM_CLOSED;
		else
			n = H2_ERR_PROTOCOL_ERROR;
		lws_h2_goaway(wsi, n, "invalid rx for state");

		return 0;
	}

	if (h2n->cont_exp && (h2n->cont_exp_sid != h2n->sid ||
			      h2n->type != LWS_H2_FRAME_TYPE_CONTINUATION)) {
		lwsl_info("%s: expected cont on sid %d (got %d on sid %d)\n",
			  __func__, h2n->cont_exp_sid, h2n->type, h2n->sid);
		h2n->cont_exp = 0;
		if (h2n->cont_exp_headers)
			n = H2_ERR_COMPRESSION_ERROR;
		else
			n = H2_ERR_PROTOCOL_ERROR;
		lws_h2_goaway(wsi, n, "Continuation hdrs State");

		return 0;
	}

	switch (h2n->type) {
	case LWS_H2_FRAME_TYPE_DATA:
		lwsl_info("seen incoming LWS_H2_FRAME_TYPE_DATA start\n");
		if (!h2n->sid) {
			lwsl_info("DATA: 0 sid\n");
			lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR, "DATA 0 sid");
			break;
		}
		lwsl_info("Frame header DATA: sid %d\n", h2n->sid);

		if (!h2n->swsi) {
			lwsl_notice("DATA: NULL swsi\n");
			break;
		}

		lwsl_info("DATA rx on state %d\n", h2n->swsi->h2.h2_state);

		if (
		    h2n->swsi->h2.h2_state == LWS_H2_STATE_HALF_CLOSED_REMOTE ||
		    h2n->swsi->h2.h2_state == LWS_H2_STATE_CLOSED) {
			lws_h2_goaway(wsi, H2_ERR_STREAM_CLOSED, "conn closed");
			break;
		}
		break;
	case LWS_H2_FRAME_TYPE_PRIORITY:
		lwsl_info("LWS_H2_FRAME_TYPE_PRIORITY complete frame\n");
		if (!h2n->sid) {
			lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
				      "Priority has 0 sid");
			break;
		}
		if (h2n->length != 5) {
			lws_h2_goaway(wsi, H2_ERR_FRAME_SIZE_ERROR,
				      "Priority has length other than 5");
			break;
		}
		break;
	case LWS_H2_FRAME_TYPE_PUSH_PROMISE:
		lwsl_info("LWS_H2_FRAME_TYPE_PUSH_PROMISE complete frame\n");
		lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR, "Server only");
		break;

	case LWS_H2_FRAME_TYPE_GOAWAY:
		lwsl_debug("LWS_H2_FRAME_TYPE_GOAWAY received\n");
		break;

	case LWS_H2_FRAME_TYPE_RST_STREAM:
		if (!h2n->sid)
			return 1;
		if (!h2n->swsi) {
			if (h2n->sid <= h2n->highest_sid_opened)
				break;
			lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
				      "crazy sid on RST_STREAM");
			return 1;
		}
		if (h2n->length != 4) {
			lws_h2_goaway(wsi, H2_ERR_FRAME_SIZE_ERROR,
				      "RST_STREAM can only be length 4");
			break;
		}
		lws_h2_state(h2n->swsi, LWS_H2_STATE_CLOSED);
		break;

	case LWS_H2_FRAME_TYPE_SETTINGS:
		lwsl_info("LWS_H2_FRAME_TYPE_SETTINGS complete frame\n");
		/* nonzero sid on settings is illegal */
		if (h2n->sid) {
			lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
					 "Settings has nonzero sid");
			break;
		}

		if (!(h2n->flags & LWS_H2_FLAG_SETTINGS_ACK)) {
			if ((!h2n->length) || h2n->length % 6) {
				lws_h2_goaway(wsi, H2_ERR_FRAME_SIZE_ERROR,
						 "Settings length error");
				break;
			}

			if (h2n->type == LWS_H2_FRAME_TYPE_COUNT)
				return 0;

			if (wsi->upgraded_to_http2) {
				pps = lws_h2_new_pps(LWS_H2_PPS_ACK_SETTINGS);
				if (!pps)
					return 1;
				lws_pps_schedule(wsi, pps);
			}
			break;
		}
		/* came to us with ACK set... not allowed to have payload */

		if (h2n->length) {
			lws_h2_goaway(wsi, H2_ERR_FRAME_SIZE_ERROR,
				      "Settings with ACK not allowed payload");
			break;
		}
		break;
	case LWS_H2_FRAME_TYPE_PING:
		if (h2n->sid) {
			lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
				      "Ping has nonzero sid");
			break;
		}
		if (h2n->length != 8) {
			lws_h2_goaway(wsi, H2_ERR_FRAME_SIZE_ERROR,
				      "Ping payload can only be 8");
			break;
		}
		break;
	case LWS_H2_FRAME_TYPE_CONTINUATION:
		lwsl_info("LWS_H2_FRAME_TYPE_CONTINUATION: sid = %d\n",
			  h2n->sid);

		if (!h2n->cont_exp ||
		     h2n->cont_exp_sid != h2n->sid ||
		     !h2n->sid ||
		     !h2n->swsi) {
			lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
				      "unexpected CONTINUATION");
			break;
		}
		if (h2n->swsi->h2.END_HEADERS) {
			lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
				      "END_HEADERS already seen");
			break;
		}
		/* END_STREAM is in HEADERS, skip resetting it */
		goto update_end_headers;

	case LWS_H2_FRAME_TYPE_HEADERS:
		lwsl_info("HEADERS: frame header: sid = %d\n", h2n->sid);
		if (!h2n->sid) {
			lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR, "sid 0");
			return 1;
		}

		if (h2n->swsi && !h2n->swsi->h2.END_STREAM &&
		    h2n->swsi->h2.END_HEADERS &&
		    !(h2n->flags & LWS_H2_FLAG_END_STREAM)) {
			lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
				      "extra HEADERS together");
			return 1;
		}

#if !defined(LWS_NO_CLIENT)
		if (wsi->client_h2_alpn) {
			if (h2n->sid) {
				h2n->swsi = lws_h2_wsi_from_id(wsi, h2n->sid);
				lwsl_info("HEADERS: nwsi %p: sid %d mapped "
					  "to wsi %p\n", wsi, h2n->sid,
					  h2n->swsi);
				if (!h2n->swsi)
					break;
			}
			goto update_end_headers;
		}
#endif

		if (!h2n->swsi) {
			/* no more children allowed by parent */
			if (wsi->h2.child_count + 1 >
			    wsi->h2.h2n->set.s[H2SET_MAX_CONCURRENT_STREAMS]) {
				lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
				"Another stream not allowed");

				return 1;
			}

			h2n->swsi = lws_wsi_server_new(wsi->vhost, wsi,
						       h2n->sid);
			if (!h2n->swsi) {
				lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
					      "OOM");

				return 1;
			}

			pps = lws_h2_new_pps(LWS_H2_PPS_UPDATE_WINDOW);
			if (!pps)
				goto cleanup_wsi;
			pps->u.update_window.sid = h2n->sid;
			pps->u.update_window.credit = 4 * 65536;
			h2n->swsi->h2.peer_tx_cr_est +=
						pps->u.update_window.credit;
			lws_pps_schedule(wsi, pps);

			pps = lws_h2_new_pps(LWS_H2_PPS_UPDATE_WINDOW);
			if (!pps)
				goto cleanup_wsi;
			pps->u.update_window.sid = 0;
			pps->u.update_window.credit = 4 * 65536;
			wsi->h2.peer_tx_cr_est += pps->u.update_window.credit;
			lws_pps_schedule(wsi, pps);
		}

		/*
		 * ah needs attaching to child wsi, even though
		 * we only fill it from network wsi
		 */
		if (!h2n->swsi->http.ah)
			if (lws_header_table_attach(h2n->swsi, 0)) {
				lwsl_err("%s: Failed to get ah\n", __func__);
				return 1;
			}

		/*
		 * The first use of a new stream identifier implicitly closes
		 * all streams in the "idle" state that might have been
		 * initiated by that peer with a lower-valued stream identifier.
		 *
		 * For example, if a client sends a HEADERS frame on stream 7
		 * without ever sending a frame on stream 5, then stream 5
		 * transitions to the "closed" state when the first frame for
		 * stream 7 is sent or received.
		 */
		lws_start_foreach_ll(struct lws *, w, wsi->h2.child_list) {
			if (w->h2.my_sid < h2n->sid &&
			    w->h2.h2_state == LWS_H2_STATE_IDLE)
				lws_close_free_wsi(w, 0, "h2 sid close");
			assert(w->h2.sibling_list != w);
		} lws_end_foreach_ll(w, h2.sibling_list);


		/* END_STREAM means after servicing this, close the stream */
		h2n->swsi->h2.END_STREAM =
					!!(h2n->flags & LWS_H2_FLAG_END_STREAM);
		lwsl_info("%s: hdr END_STREAM = %d\n",__func__,
			  h2n->swsi->h2.END_STREAM);

		h2n->cont_exp = !(h2n->flags & LWS_H2_FLAG_END_HEADERS);
		h2n->cont_exp_sid = h2n->sid;
		h2n->cont_exp_headers = 1;
	//	lws_header_table_reset(h2n->swsi, 0);

update_end_headers:
		/* no END_HEADERS means CONTINUATION must come */
		h2n->swsi->h2.END_HEADERS =
				!!(h2n->flags & LWS_H2_FLAG_END_HEADERS);
		lwsl_info("%p: END_HEADERS %d\n", h2n->swsi,
			  h2n->swsi->h2.END_HEADERS);
		if (h2n->swsi->h2.END_HEADERS)
			h2n->cont_exp = 0;
		lwsl_debug("END_HEADERS %d\n", h2n->swsi->h2.END_HEADERS);
		break;

cleanup_wsi:

		return 1;

	case LWS_H2_FRAME_TYPE_WINDOW_UPDATE:
		if (h2n->length != 4) {
			lws_h2_goaway(wsi, H2_ERR_FRAME_SIZE_ERROR,
				      "window update frame not 4");
			break;
		}
		lwsl_info("LWS_H2_FRAME_TYPE_WINDOW_UPDATE\n");
		break;
	case LWS_H2_FRAME_TYPE_COUNT:
		break;
	default:
		lwsl_info("%s: ILLEGAL FRAME TYPE %d\n", __func__, h2n->type);
		h2n->type = LWS_H2_FRAME_TYPE_COUNT; /* ie, IGNORE */
		break;
	}
	if (h2n->length == 0)
		h2n->frame_state = 0;

	return 0;
}

static const char * const method_names[] = {
	"GET", "POST", "OPTIONS", "PUT", "PATCH", "DELETE", "CONNECT", "HEAD"
};
static unsigned char method_index[] = {
	WSI_TOKEN_GET_URI,
	WSI_TOKEN_POST_URI,
	WSI_TOKEN_OPTIONS_URI,
	WSI_TOKEN_PUT_URI,
	WSI_TOKEN_PATCH_URI,
	WSI_TOKEN_DELETE_URI,
	WSI_TOKEN_CONNECT,
	WSI_TOKEN_HEAD_URI,
};

/*
 * The last byte of the whole frame has been handled.
 * Perform actions for frame completion.
 *
 * This is the crunch time for parsing that may have occured on a network
 * wsi with a pending partial send... we may call lws_http_action() to send
 * a response, conflicting with the partial.
 *
 * So in that case we change the wsi state and do the lws_http_action() in the
 * WRITABLE handler as a priority.
 */
static int
lws_h2_parse_end_of_frame(struct lws *wsi)
{
	struct lws_h2_netconn *h2n = wsi->h2.h2n;
	struct lws *eff_wsi = wsi;
	const char *p;
	int n;

	h2n->frame_state = 0;
	h2n->count = 0;

	if (h2n->sid)
		h2n->swsi = lws_h2_wsi_from_id(wsi, h2n->sid);

	if (h2n->sid > h2n->highest_sid)
		h2n->highest_sid = h2n->sid;

	/* set our initial window size */
	if (!wsi->h2.initialized) {
		wsi->h2.tx_cr = h2n->set.s[H2SET_INITIAL_WINDOW_SIZE];
		lwsl_info("initial tx credit on master %p: %d\n", wsi,
			  wsi->h2.tx_cr);
		wsi->h2.initialized = 1;
	}

	if (h2n->collected_priority && (h2n->dep & ~(1u << 31)) == h2n->sid) {
		lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR, "depends on own sid");
		return 0;
	}

	switch (h2n->type) {

	case LWS_H2_FRAME_TYPE_SETTINGS:

#if !defined(LWS_NO_CLIENT)
		if (wsi->client_h2_alpn &&
		    !(h2n->flags & LWS_H2_FLAG_SETTINGS_ACK)) {
			struct lws_h2_protocol_send *pps;

			/* migrate original client ask on to substream 1 */

			wsi->http.fop_fd = NULL;

			/*
			 * we need to treat the headers from the upgrade as the
			 * first job.  So these need to get shifted to sid 1.
			 */
			h2n->swsi = lws_wsi_server_new(wsi->vhost, wsi, 1);
			if (!h2n->swsi)
				return 1;
			h2n->sid = 1;

			assert(lws_h2_wsi_from_id(wsi, 1) == h2n->swsi);

			lws_role_transition(wsi, LWSIFR_CLIENT,
					    LRS_H2_WAITING_TO_SEND_HEADERS,
					    &role_ops_h2);

			lws_role_transition(h2n->swsi, LWSIFR_CLIENT,
					    LRS_H2_WAITING_TO_SEND_HEADERS,
					    &role_ops_h2);

			/* pass on the initial headers to SID 1 */
			h2n->swsi->http.ah = wsi->http.ah;
			h2n->swsi->client_h2_substream = 1;

			h2n->swsi->protocol = wsi->protocol;
			if (h2n->swsi->user_space && !h2n->swsi->user_space_externally_allocated)
				lws_free(h2n->swsi->user_space);
			h2n->swsi->user_space = wsi->user_space;
			h2n->swsi->user_space_externally_allocated =
					wsi->user_space_externally_allocated;
			h2n->swsi->opaque_user_data = wsi->opaque_user_data;
			wsi->opaque_user_data = NULL;

			wsi->user_space = NULL;

			if (h2n->swsi->http.ah)
				h2n->swsi->http.ah->wsi = h2n->swsi;
			wsi->http.ah = NULL;

			lwsl_info("%s: MIGRATING nwsi %p: swsi %p\n", __func__,
				  wsi, h2n->swsi);
			h2n->swsi->h2.tx_cr =
				h2n->set.s[H2SET_INITIAL_WINDOW_SIZE];
			lwsl_info("initial tx credit on conn %p: %d\n",
				  h2n->swsi, h2n->swsi->h2.tx_cr);
			h2n->swsi->h2.initialized = 1;

			lws_callback_on_writable(h2n->swsi);

			pps = lws_h2_new_pps(LWS_H2_PPS_ACK_SETTINGS);
			if (!pps)
				return 1;
			lws_pps_schedule(wsi, pps);
			lwsl_info("%s: scheduled settings ack PPS\n", __func__);

			/* also attach any queued guys */

			/* we have a transaction queue that wants to pipeline */
			lws_vhost_lock(wsi->vhost);
			lws_start_foreach_dll_safe(struct lws_dll2 *, d, d1,
				  wsi->dll2_cli_txn_queue_owner.head) {
				struct lws *w = lws_container_of(d, struct lws,
						dll2_cli_txn_queue);

				if (lwsi_state(w) == LRS_H1C_ISSUE_HANDSHAKE2) {
					lwsl_info("%s: cli pipeq %p to be h2\n",
							__func__, w);
					/* remove ourselves from client queue */
					lws_dll2_remove(&w->dll2_cli_txn_queue);

					/* attach ourselves as an h2 stream */
					lws_wsi_h2_adopt(wsi, w);
				}
			} lws_end_foreach_dll_safe(d, d1);
			lws_vhost_unlock(wsi->vhost);
		}
#endif
		break;

	case LWS_H2_FRAME_TYPE_CONTINUATION:
	case LWS_H2_FRAME_TYPE_HEADERS:

		if (!h2n->swsi)
			break;

		/* service the http request itself */

		if (h2n->last_action_dyntable_resize) {
			lws_h2_goaway(wsi, H2_ERR_COMPRESSION_ERROR,
				"dyntable resize last in headers");
			break;
		}

		if (!h2n->swsi->h2.END_HEADERS) {
			/* we are not finished yet */
			lwsl_info("witholding http action for continuation\n");
			break;
		}

		/* confirm the hpack stream state is reasonable for finishing */

		if (h2n->hpack != HPKS_TYPE) {
			/* hpack incomplete */
			lwsl_info("hpack incomplete %d (type %d, len %d)\n",
				  h2n->hpack, h2n->type, h2n->hpack_len);
			lws_h2_goaway(wsi, H2_ERR_COMPRESSION_ERROR,
				      "hpack incomplete");
			break;
		}

		/* this is the last part of HEADERS */
		switch (h2n->swsi->h2.h2_state) {
		case LWS_H2_STATE_IDLE:
			lws_h2_state(h2n->swsi, LWS_H2_STATE_OPEN);
			break;
		case LWS_H2_STATE_RESERVED_REMOTE:
			lws_h2_state(h2n->swsi, LWS_H2_STATE_HALF_CLOSED_LOCAL);
			break;
		}

		lwsl_info("http req, wsi=%p, h2n->swsi=%p\n", wsi, h2n->swsi);
		h2n->swsi->hdr_parsing_completed = 1;

#if !defined(LWS_NO_CLIENT)
		if (h2n->swsi->client_h2_substream) {
			if (lws_client_interpret_server_handshake(h2n->swsi)) {
				lws_h2_rst_stream(h2n->swsi,
						  H2_ERR_STREAM_CLOSED,
						  "protocol CLI_EST closed it");
				break;
			}
		}
#endif

		if (lws_hdr_extant(h2n->swsi, WSI_TOKEN_HTTP_CONTENT_LENGTH)) {
			h2n->swsi->http.rx_content_length  = atoll(
				lws_hdr_simple_ptr(h2n->swsi,
				      WSI_TOKEN_HTTP_CONTENT_LENGTH));
			h2n->swsi->http.rx_content_remain =
					h2n->swsi->http.rx_content_length;
			lwsl_info("setting rx_content_length %lld\n",
				  (long long)h2n->swsi->http.rx_content_length);
		}

		{
			int n = 0, len;
			char buf[256];
			const unsigned char *c;

			do {
				c = lws_token_to_string(n);
				if (!c) {
					n++;
					continue;
				}

				len = lws_hdr_total_length(h2n->swsi, n);
				if (!len || len > (int)sizeof(buf) - 1) {
					n++;
					continue;
				}

				if (lws_hdr_copy(h2n->swsi, buf, sizeof buf,
						 n) < 0) {
					lwsl_info("    %s !oversize!\n",
						  (char *)c);
				} else {
					buf[sizeof(buf) - 1] = '\0';

					lwsl_info("    %s = %s\n",
						  (char *)c, buf);
				}
				n++;
			} while (c);
		}

		if (h2n->swsi->h2.h2_state == LWS_H2_STATE_HALF_CLOSED_REMOTE ||
		    h2n->swsi->h2.h2_state == LWS_H2_STATE_CLOSED) {
			lws_h2_goaway(wsi, H2_ERR_STREAM_CLOSED,
				      "Banning service on CLOSED_REMOTE");
			break;
		}

		switch (h2n->swsi->h2.h2_state) {
		case LWS_H2_STATE_OPEN:
			if (h2n->swsi->h2.END_STREAM)
				lws_h2_state(h2n->swsi,
					     LWS_H2_STATE_HALF_CLOSED_REMOTE);
			break;
		case LWS_H2_STATE_HALF_CLOSED_LOCAL:
			if (h2n->swsi->h2.END_STREAM)
				lws_h2_state(h2n->swsi, LWS_H2_STATE_CLOSED);
			break;
		}

#if !defined(LWS_NO_CLIENT)
		if (h2n->swsi->client_h2_substream) {
			lwsl_info("%s: headers: client path\n", __func__);
			break;
		}
#endif

		if (!lws_hdr_total_length(h2n->swsi, WSI_TOKEN_HTTP_COLON_PATH) ||
		    !lws_hdr_total_length(h2n->swsi, WSI_TOKEN_HTTP_COLON_METHOD) ||
		    !lws_hdr_total_length(h2n->swsi, WSI_TOKEN_HTTP_COLON_SCHEME) ||
		     lws_hdr_total_length(h2n->swsi, WSI_TOKEN_HTTP_COLON_STATUS) ||
		     lws_hdr_extant(h2n->swsi, WSI_TOKEN_CONNECTION)) {
			lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
				      "Pseudoheader checks");
			break;
		}


		if (lws_hdr_extant(h2n->swsi, WSI_TOKEN_TE)) {
			n = lws_hdr_total_length(h2n->swsi, WSI_TOKEN_TE);

			if (n != 8 ||
			    strncmp(lws_hdr_simple_ptr(h2n->swsi, WSI_TOKEN_TE),
				  "trailers", n)) {
				lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
					      "Illegal transfer-encoding");
				break;
			}
		}

#if defined(LWS_WITH_HTTP_STREAM_COMPRESSION)
		lws_http_compression_validate(h2n->swsi);
#endif

		wsi->vhost->conn_stats.h2_trans++;
		p = lws_hdr_simple_ptr(h2n->swsi, WSI_TOKEN_HTTP_COLON_METHOD);
		/*
		 * duplicate :path into the individual method uri header
		 * index, so that it looks the same as h1 in the ah
		 */
		for (n = 0; n < (int)LWS_ARRAY_SIZE(method_names); n++)
			if (!strcasecmp(p, method_names[n])) {
				h2n->swsi->http.ah->frag_index[method_index[n]] =
						h2n->swsi->http.ah->frag_index[
				                     WSI_TOKEN_HTTP_COLON_PATH];
				break;
			}

		lwsl_debug("%s: setting DEF_ACT from 0x%x\n", __func__,
			   h2n->swsi->wsistate);
		lwsi_set_state(h2n->swsi, LRS_DEFERRING_ACTION);
		lws_callback_on_writable(h2n->swsi);
		break;

	case LWS_H2_FRAME_TYPE_DATA:
		if (!h2n->swsi)
			break;

		if (lws_hdr_total_length(h2n->swsi,
					 WSI_TOKEN_HTTP_CONTENT_LENGTH) &&
		    h2n->swsi->h2.END_STREAM &&
		    h2n->swsi->http.rx_content_length &&
		    h2n->swsi->http.rx_content_remain) {
			lws_h2_rst_stream(h2n->swsi, H2_ERR_PROTOCOL_ERROR,
					  "Not enough rx content");
			break;
		}

		if (h2n->swsi->h2.END_STREAM &&
		    h2n->swsi->h2.h2_state == LWS_H2_STATE_OPEN)
			lws_h2_state(h2n->swsi,
				     LWS_H2_STATE_HALF_CLOSED_REMOTE);

		if (h2n->swsi->h2.END_STREAM &&
		    h2n->swsi->h2.h2_state == LWS_H2_STATE_HALF_CLOSED_LOCAL)
			lws_h2_state(h2n->swsi, LWS_H2_STATE_CLOSED);

#if !defined(LWS_NO_CLIENT)
		/*
		 * client... remote END_STREAM implies we weren't going to
		 * send anything else anyway.
		 */

		if (h2n->swsi->client_h2_substream &&
		    h2n->flags & LWS_H2_FLAG_END_STREAM) {
			lwsl_info("%s: %p: DATA: end stream\n",
				  __func__, h2n->swsi);

			if (h2n->swsi->h2.h2_state == LWS_H2_STATE_OPEN) {
				lws_h2_state(h2n->swsi,
					     LWS_H2_STATE_HALF_CLOSED_REMOTE);
		//		lws_h2_rst_stream(h2n->swsi, H2_ERR_NO_ERROR,
		//				  "client done");

		//		if (lws_http_transaction_completed_client(h2n->swsi))
		//			lwsl_debug("tx completed returned close\n");
			}

			//if (h2n->swsi->h2.h2_state == LWS_H2_STATE_HALF_CLOSED_LOCAL)
			{
				lws_h2_state(h2n->swsi, LWS_H2_STATE_CLOSED);

				lws_h2_rst_stream(h2n->swsi, H2_ERR_NO_ERROR,
						  "client done");

				if (lws_http_transaction_completed_client(h2n->swsi))
					lwsl_debug("tx completed returned close\n");
			}
		}
#endif
		break;

	case LWS_H2_FRAME_TYPE_PING:
		if (h2n->flags & LWS_H2_FLAG_SETTINGS_ACK) { // ack
		} else {/* they're sending us a ping request */
			struct lws_h2_protocol_send *pps =
					lws_h2_new_pps(LWS_H2_PPS_PONG);
			if (!pps)
				return 1;

			lwsl_info("rx ping, preparing pong\n");

			memcpy(pps->u.ping.ping_payload, h2n->ping_payload, 8);
			lws_pps_schedule(wsi, pps);
		}

		break;

	case LWS_H2_FRAME_TYPE_WINDOW_UPDATE:
		h2n->hpack_e_dep &= ~(1u << 31);
		lwsl_info("WINDOW_UPDATE: sid %d %u (0x%x)\n", h2n->sid,
			    h2n->hpack_e_dep, h2n->hpack_e_dep);

		if (h2n->sid)
			eff_wsi = h2n->swsi;

		if (!eff_wsi) {
			if (h2n->sid > h2n->highest_sid_opened)
				lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
					      "alien sid");
			break; /* ignore */
		}

		if (eff_wsi->vhost->options &
		        LWS_SERVER_OPTION_H2_JUST_FIX_WINDOW_UPDATE_OVERFLOW &&
		    (uint64_t)eff_wsi->h2.tx_cr + (uint64_t)h2n->hpack_e_dep >
		    (uint64_t)0x7fffffff)
			h2n->hpack_e_dep = 0x7fffffff - eff_wsi->h2.tx_cr;

		if ((uint64_t)eff_wsi->h2.tx_cr + (uint64_t)h2n->hpack_e_dep >
		    (uint64_t)0x7fffffff) {
			if (h2n->sid)
				lws_h2_rst_stream(h2n->swsi,
						  H2_ERR_FLOW_CONTROL_ERROR,
						  "Flow control exceeded max");
			else
				lws_h2_goaway(wsi, H2_ERR_FLOW_CONTROL_ERROR,
					      "Flow control exceeded max");
			break;
		}

		if (!h2n->hpack_e_dep) {
			lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
				      "Zero length window update");
			break;
		}
		n = eff_wsi->h2.tx_cr;
		eff_wsi->h2.tx_cr += h2n->hpack_e_dep;

		if (n <= 0 && eff_wsi->h2.tx_cr <= 0)
			/* it helps, but won't change sendability for anyone */
			break;

		/*
		 * It did change sendability... for us and any children waiting
		 * on us... reassess blockage for all children first
		 */
		lws_start_foreach_ll(struct lws *, w, wsi->h2.child_list) {
			lws_callback_on_writable(w);
		} lws_end_foreach_ll(w, h2.sibling_list);

		if (eff_wsi->h2.skint && lws_h2_tx_cr_get(eff_wsi)) {
			lwsl_info("%s: %p: skint\n", __func__, wsi);
			eff_wsi->h2.skint = 0;
			lws_callback_on_writable(eff_wsi);
		}
		break;

	case LWS_H2_FRAME_TYPE_GOAWAY:
		lwsl_info("GOAWAY: last sid %d, error 0x%08X, string '%s'\n",
			  h2n->goaway_last_sid, h2n->goaway_err,
			  h2n->goaway_str);
		wsi->h2.GOING_AWAY = 1;

		return 1;

	case LWS_H2_FRAME_TYPE_RST_STREAM:
		lwsl_info("LWS_H2_FRAME_TYPE_RST_STREAM: sid %d: reason 0x%x\n",
			  h2n->sid, h2n->hpack_e_dep);
		break;

	case LWS_H2_FRAME_TYPE_COUNT: /* IGNORING FRAME */
		break;
	}

	return 0;
}

/*
 * This may want to send something on the network wsi, which may be in the
 * middle of a partial send.  PPS sends are OK because they are queued to
 * go through the WRITABLE handler already.
 *
 * The read parser for the network wsi has no choice but to parse its stream
 * anyway, because otherwise it will not be able to get tx credit window
 * messages.
 *
 * Therefore if we will send non-PPS, ie, lws_http_action() for a stream
 * wsi, we must change its state and handle it as a priority in the
 * POLLOUT handler instead of writing it here.
 *
 * About closing... for the main network wsi, it should return nonzero to
 * close it all.  If it needs to close an swsi, it can do it here.
 */
int
lws_h2_parser(struct lws *wsi, unsigned char *in, lws_filepos_t inlen,
	      lws_filepos_t *inused)
{
	struct lws_h2_netconn *h2n = wsi->h2.h2n;
	struct lws_h2_protocol_send *pps;
	unsigned char c, *oldin = in;
	int n, m;

	if (!h2n)
		goto fail;

	while (inlen--) {

		c = *in++;

		// lwsl_notice("%s: 0x%x\n", __func__, c);

		switch (lwsi_state(wsi)) {
		case LRS_H2_AWAIT_PREFACE:
			if (preface[h2n->count++] != c)
				goto fail;

			if (preface[h2n->count])
				break;

			lwsl_info("http2: %p: established\n", wsi);
			lwsi_set_state(wsi, LRS_H2_AWAIT_SETTINGS);
			h2n->count = 0;
			wsi->h2.tx_cr = 65535;

			/*
			 * we must send a settings frame -- empty one is OK...
			 * that must be the first thing sent by server
			 * and the peer must send a SETTINGS with ACK flag...
			 */
			pps = lws_h2_new_pps(LWS_H2_PPS_MY_SETTINGS);
			if (!pps)
				goto fail;
			lws_pps_schedule(wsi, pps);
			break;

		case LRS_H2_WAITING_TO_SEND_HEADERS:
		case LRS_ESTABLISHED:
		case LRS_H2_AWAIT_SETTINGS:
			if (h2n->frame_state != LWS_H2_FRAME_HEADER_LENGTH)
				goto try_frame_start;

			/*
			 * post-header, preamble / payload / padding part
			 */
			h2n->count++;

			if (h2n->flags & LWS_H2_FLAG_PADDED &&
			    !h2n->pad_length) {
				/*
				 * Get the padding count... actual padding is
				 * at the end of the frame.
				 */
				h2n->padding = c;
				h2n->pad_length = 1;
				h2n->preamble++;

				if (h2n->padding > h2n->length - 1)
					lws_h2_goaway(wsi,
						      H2_ERR_PROTOCOL_ERROR,
						      "execssive padding");
				break; /* we consumed this */
			}

			if (h2n->flags & LWS_H2_FLAG_PRIORITY &&
			    !h2n->collected_priority) {
				/* going to be 5 preamble bytes */

				lwsl_debug("PRIORITY FLAG:  0x%x\n", c);

				if (h2n->preamble++ - h2n->pad_length < 4) {
					h2n->dep = ((h2n->dep) << 8) | c;
					break; /* we consumed this */
				}
				h2n->weight_temp = c;
				h2n->collected_priority = 1;
				lwsl_debug("PRI FL: dep 0x%x, weight 0x%02X\n",
					   h2n->dep, h2n->weight_temp);
				break; /* we consumed this */
			}
			if (h2n->padding && h2n->count >
			    (h2n->length - h2n->padding)) {
				if (c) {
					lws_h2_goaway(wsi,
						      H2_ERR_PROTOCOL_ERROR,
						      "nonzero padding");
					break;
				}
				goto frame_end;
			}

			/* applies to wsi->h2.swsi which may be wsi */
			switch(h2n->type) {

			case LWS_H2_FRAME_TYPE_SETTINGS:
				n = (h2n->count - 1 - h2n->preamble) %
				     LWS_H2_SETTINGS_LEN;
				h2n->one_setting[n] = c;
				if (n != LWS_H2_SETTINGS_LEN - 1)
					break;
				lws_h2_settings(wsi, &h2n->set,
						h2n->one_setting,
						LWS_H2_SETTINGS_LEN);
				break;

			case LWS_H2_FRAME_TYPE_CONTINUATION:
			case LWS_H2_FRAME_TYPE_HEADERS:
				if (!h2n->swsi)
					break;
				if (lws_hpack_interpret(h2n->swsi, c)) {
					lwsl_info("%s: hpack failed\n",
						  __func__);
					goto fail;
				}
				break;

			case LWS_H2_FRAME_TYPE_GOAWAY:
				switch (h2n->inside++) {
				case 0:
				case 1:
				case 2:
				case 3:
					h2n->goaway_last_sid <<= 8;
					h2n->goaway_last_sid |= c;
					h2n->goaway_str[0] = '\0';
					break;

				case 4:
				case 5:
				case 6:
				case 7:
					h2n->goaway_err <<= 8;
					h2n->goaway_err |= c;
					break;

				default:
					if (h2n->inside - 9 <
					    sizeof(h2n->goaway_str) - 1)
						h2n->goaway_str[
						           h2n->inside - 9] = c;
					h2n->goaway_str[
					    sizeof(h2n->goaway_str) - 1] = '\0';
					break;
				}
				break;

			case LWS_H2_FRAME_TYPE_DATA:

				lwsl_info("%s: LWS_H2_FRAME_TYPE_DATA\n",
					  __func__);

				/*
				 * let the network wsi live a bit longer if
				 * subs are active... our frame may take a long
				 * time to chew through
				 */
				if (!wsi->immortal_substream_count)
					lws_set_timeout(wsi,
					  PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE,
#if defined(LWS_AMAZON_RTOS) || defined(LWS_AMAZON_LINUX)
					  wsi->vhost->keepalive_timeout);
#else
					  31);
#endif

				if (!h2n->swsi)
					break;

				if (lws_buflist_next_segment_len(
						&h2n->swsi->buflist, NULL))
					lwsl_info("%s: substream has pending\n",
						  __func__);

				if (lwsi_role_http(h2n->swsi) &&
				    lwsi_state(h2n->swsi) == LRS_ESTABLISHED) {
					lwsi_set_state(h2n->swsi, LRS_BODY);
					lwsl_info("%s: swsi %p to LRS_BODY\n",
							__func__, h2n->swsi);
				}

				if (lws_hdr_total_length(h2n->swsi,
					     WSI_TOKEN_HTTP_CONTENT_LENGTH) &&
				    h2n->swsi->http.rx_content_length &&
				    h2n->swsi->http.rx_content_remain <
						    inlen + 1 && /* last */
				    h2n->inside < h2n->length) {
					/* unread data in frame */
					lws_h2_goaway(wsi,
						      H2_ERR_PROTOCOL_ERROR,
					    "More rx than content_length told");
					break;
				}

				/*
				 * We operate on a frame.  The RX we have at
				 * hand may exceed the current frame.
				 */

				n = (int)inlen + 1;
				if (n > (int)(h2n->length - h2n->count + 1)) {
					n = h2n->length - h2n->count + 1;
					lwsl_debug("---- restricting len to %d vs %ld\n", n, (long)inlen + 1);
				}
#if !defined(LWS_NO_CLIENT)
				if (h2n->swsi->client_h2_substream) {

					m = user_callback_handle_rxflow(
						h2n->swsi->protocol->callback,
						h2n->swsi,
					  LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ,
						h2n->swsi->user_space,
						in - 1, n);

					in += n - 1;
					h2n->inside += n;
					h2n->count += n - 1;
					inlen -= n - 1;

					if (m) {
						lwsl_info("RECEIVE_CLIENT_HTTP "
							  "closed it\n");
						goto close_swsi_and_return;
					}

					break;
				} else
#endif
				{

					if (lwsi_state(h2n->swsi) == LRS_DEFERRING_ACTION) {
						// lwsl_notice("appending because we are in LRS_DEFERRING_ACTION\n");
						m = lws_buflist_append_segment(
							&h2n->swsi->buflist,
								in - 1, n);
						if (m < 0)
							return -1;
						if (m) {
							struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
							lwsl_debug("%s: added %p to rxflow list\n", __func__, wsi);
							lws_dll2_add_head(&h2n->swsi->dll_buflist, &pt->dll_buflist_owner);
						}
						in += n - 1;
						h2n->inside += n;
						h2n->count += n - 1;
						inlen -= n - 1;

						lwsl_debug("%s: deferred %d\n", __func__, n);
						goto do_windows;
					}

					h2n->swsi->outer_will_close = 1;
					/*
					 * choose the length for this go so that we end at
					 * the frame boundary, in the case there is already
					 * more waiting leave it for next time around
					 */

					n = lws_read_h1(h2n->swsi, in - 1, n);
					// lwsl_notice("%s: lws_read_h1 %d\n", __func__, n);
					h2n->swsi->outer_will_close = 0;
					/*
					 * can return 0 in POST body with
					 * content len exhausted somehow.
					 */
					if (n < 0 ||
					    (!n && !lws_buflist_next_segment_len(&wsi->buflist, NULL))) {
						lwsl_info("%s: lws_read_h1 told %d %d / %d\n",
							__func__, n, h2n->count, h2n->length);
						in += h2n->length - h2n->count;
						h2n->inside = h2n->length;
						h2n->count = h2n->length - 1;

						//if (n < 0)
						//	goto already_closed_swsi;
						goto close_swsi_and_return;
					}

					inlen -= n - 1;
					in += n - 1;
					h2n->inside += n;
					h2n->count += n - 1;
				}

do_windows:
				/* account for both network and stream wsi windows */

				wsi->h2.peer_tx_cr_est -= n;
				h2n->swsi->h2.peer_tx_cr_est -= n;

	//			lwsl_notice("   peer_tx_cr_est %d, parent %d\n",
	//				   h2n->swsi->h2.peer_tx_cr_est, wsi->h2.peer_tx_cr_est);

				if (h2n->swsi->h2.peer_tx_cr_est < (int)(2 * h2n->length) + 65536) {
					pps = lws_h2_new_pps(LWS_H2_PPS_UPDATE_WINDOW);
					if (!pps)
						return 1;
					pps->u.update_window.sid = h2n->sid;
					pps->u.update_window.credit = (2 * h2n->length + 65536);
					h2n->swsi->h2.peer_tx_cr_est += pps->u.update_window.credit; 
					lws_pps_schedule(wsi, pps);
				}
				if (wsi->h2.peer_tx_cr_est < (int)(2 * h2n->length) + 65536) {
					pps = lws_h2_new_pps(LWS_H2_PPS_UPDATE_WINDOW);
					if (!pps)
						return 1;
					pps->u.update_window.sid = 0;
					pps->u.update_window.credit = (2 * h2n->length + 65536);
					wsi->h2.peer_tx_cr_est += pps->u.update_window.credit;
					lws_pps_schedule(wsi, pps);
				}

				// lwsl_notice("%s: count %d len %d\n", __func__, (int)h2n->count, (int)h2n->length);

				break;

			case LWS_H2_FRAME_TYPE_PRIORITY:
				if (h2n->count <= 4) {
					h2n->dep <<= 8;
					h2n->dep |= c;
				} else {
					h2n->weight_temp = c;
					lwsl_info("PRIORITY: dep 0x%x, weight 0x%02X\n",
						  h2n->dep, h2n->weight_temp);

					if ((h2n->dep & ~(1u << 31)) == h2n->sid) {
						lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
							      "cant depend on own sid");
						break;
					}
				}
				break;

			case LWS_H2_FRAME_TYPE_RST_STREAM:
				h2n->hpack_e_dep <<= 8;
				h2n->hpack_e_dep |= c;
				break;

			case LWS_H2_FRAME_TYPE_PUSH_PROMISE:
				break;

			case LWS_H2_FRAME_TYPE_PING:
				if (h2n->flags & LWS_H2_FLAG_SETTINGS_ACK) { // ack
				} else { /* they're sending us a ping request */
					if (h2n->count > 8)
						return 1;
					h2n->ping_payload[h2n->count - 1] = c;
				}
				break;

			case LWS_H2_FRAME_TYPE_WINDOW_UPDATE:
				h2n->hpack_e_dep <<= 8;
				h2n->hpack_e_dep |= c;
				break;

			case LWS_H2_FRAME_TYPE_COUNT: /* IGNORING FRAME */
				break;

			default:
				lwsl_notice("%s: unhandled frame type %d\n",
					    __func__, h2n->type);

				goto fail;
			}

frame_end:
			if (h2n->count > h2n->length) {
				lwsl_notice("%s: count > length %d %d\n",
					    __func__, h2n->count, h2n->length);
				goto fail;
			}
			if (h2n->count != h2n->length)
				break;

			/*
			 * end of frame just happened
			 */
			if (lws_h2_parse_end_of_frame(wsi))
				goto fail;

			break;

try_frame_start:
			if (h2n->frame_state <= 8) {

				switch (h2n->frame_state++) {
				case 0:
					h2n->pad_length = 0;
					h2n->collected_priority = 0;
					h2n->padding = 0;
					h2n->preamble = 0;
					h2n->length = c;
					h2n->inside = 0;
					break;
				case 1:
				case 2:
					h2n->length <<= 8;
					h2n->length |= c;
					break;
				case 3:
					h2n->type = c;
					break;
				case 4:
					h2n->flags = c;
					break;

				case 5:
				case 6:
				case 7:
				case 8:
					h2n->sid <<= 8;
					h2n->sid |= c;
					break;
				}
			}

			if (h2n->frame_state == LWS_H2_FRAME_HEADER_LENGTH)
				if (lws_h2_parse_frame_header(wsi))
					goto fail;
			break;

		default:
			break;
		}
	}

	*inused = in - oldin;

	return 0;

close_swsi_and_return:

	lws_close_free_wsi(h2n->swsi, 0, "close_swsi_and_return");
	h2n->swsi = NULL;
	h2n->frame_state = 0;
	h2n->count = 0;

// already_closed_swsi:
	*inused = in - oldin;

	return 2;

fail:
	*inused = in - oldin;

	return 1;
}

int
lws_h2_client_handshake(struct lws *wsi)
{
	struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
	uint8_t *buf, *start, *p, *end;
	char *meth = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_METHOD),
	     *uri = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_URI);
	struct lws *nwsi = lws_get_network_wsi(wsi);
	struct lws_h2_protocol_send *pps;
	int n;
	/*
	 * The identifier of a newly established stream MUST be numerically
	 * greater than all streams that the initiating endpoint has opened or
	 * reserved.  This governs streams that are opened using a HEADERS frame
	 * and streams that are reserved using PUSH_PROMISE.  An endpoint that
	 * receives an unexpected stream identifier MUST respond with a
	 * connection error (Section 5.4.1) of type PROTOCOL_ERROR.
	 */
	int sid = nwsi->h2.h2n->highest_sid_opened + 2;

	nwsi->h2.h2n->highest_sid_opened = sid;
	wsi->h2.my_sid = sid;

	lwsl_info("%s: CLIENT_WAITING_TO_SEND_HEADERS: pollout (sid %d)\n",
			__func__, wsi->h2.my_sid);

	pps = lws_h2_new_pps(LWS_H2_PPS_UPDATE_WINDOW);
	if (!pps)
		return 1;
	pps->u.update_window.sid = sid;
	pps->u.update_window.credit = 4 * 65536;
	wsi->h2.peer_tx_cr_est += pps->u.update_window.credit;
	lws_pps_schedule(wsi, pps);

	pps = lws_h2_new_pps(LWS_H2_PPS_UPDATE_WINDOW);
	if (!pps)
		return 1;
	pps->u.update_window.sid = 0;
	pps->u.update_window.credit = 4 * 65536;
	wsi->h2.peer_tx_cr_est += pps->u.update_window.credit;
	lws_pps_schedule(wsi, pps);

	p = start = buf = pt->serv_buf + LWS_PRE;
	end = start + wsi->context->pt_serv_buf_size - LWS_PRE - 1;

	/* it's time for us to send our client stream headers */

	if (!meth)
		meth = "GET";

	if (lws_add_http_header_by_token(wsi,
				WSI_TOKEN_HTTP_COLON_METHOD,
				(unsigned char *)meth,
				(int)strlen(meth), &p, end))
		goto fail_length;

	if (lws_add_http_header_by_token(wsi,
				WSI_TOKEN_HTTP_COLON_SCHEME,
				(unsigned char *)"https", 4,
				&p, end))
		goto fail_length;

	if (lws_add_http_header_by_token(wsi,
				WSI_TOKEN_HTTP_COLON_PATH,
				(unsigned char *)uri,
				lws_hdr_total_length(wsi, _WSI_TOKEN_CLIENT_URI),
				&p, end))
		goto fail_length;

	if (lws_add_http_header_by_token(wsi,
				WSI_TOKEN_HTTP_COLON_AUTHORITY,
				(unsigned char *)lws_hdr_simple_ptr(wsi,
						_WSI_TOKEN_CLIENT_ORIGIN),
			lws_hdr_total_length(wsi, _WSI_TOKEN_CLIENT_ORIGIN),
				&p, end))
		goto fail_length;

	/* give userland a chance to append, eg, cookies */

	if (wsi->protocol->callback(wsi,
				LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER,
				wsi->user_space, &p, (end - p) - 12))
		goto fail_length;

	if (lws_finalize_http_header(wsi, &p, end))
		goto fail_length;

	n = lws_write(wsi, start, p - start,
		      LWS_WRITE_HTTP_HEADERS);
	if (n != (p - start)) {
		lwsl_err("_write returned %d from %ld\n", n,
			 (long)(p - start));
		return -1;
	}

	lws_h2_state(wsi, LWS_H2_STATE_OPEN);
	lwsi_set_state(wsi, LRS_ESTABLISHED);

	return 0;

fail_length:
	lwsl_err("Client hdrs too long: incr context info.pt_serv_buf_size\n");

	return -1;
}

int
lws_h2_ws_handshake(struct lws *wsi)
{
	uint8_t buf[LWS_PRE + 2048], *p = buf + LWS_PRE, *start = p,
		*end = &buf[sizeof(buf) - 1];
	const struct lws_http_mount *hit;
	const char * uri_ptr;
	int n, m;

	if (lws_add_http_header_status(wsi, HTTP_STATUS_OK, &p, end))
		return -1;

	if (lws_hdr_total_length(wsi, WSI_TOKEN_PROTOCOL) > 64)
		return -1;

	if (wsi->proxied_ws_parent && wsi->child_list) {
		if (lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL)) {
			if (lws_add_http_header_by_token(wsi, WSI_TOKEN_PROTOCOL,
				(uint8_t *)lws_hdr_simple_ptr(wsi,
							   WSI_TOKEN_PROTOCOL),
				(int)strlen(lws_hdr_simple_ptr(wsi,
							   WSI_TOKEN_PROTOCOL)),
						 &p, end))
			return -1;
		}
	} else {

		/* we can only return the protocol header if:
		 *  - one came in, and ... */
		if (lws_hdr_total_length(wsi, WSI_TOKEN_PROTOCOL) &&
		    /*  - it is not an empty string */
		    wsi->protocol->name && wsi->protocol->name[0]) {
			if (lws_add_http_header_by_token(wsi, WSI_TOKEN_PROTOCOL,
						 (unsigned char *)wsi->protocol->name,
						 (int)strlen(wsi->protocol->name),
						 &p, end))
			return -1;
		}
	}

	if (lws_finalize_http_header(wsi, &p, end))
		return -1;

	m = lws_ptr_diff(p, start);
	// lwsl_hexdump_notice(start, m);
	n = lws_write(wsi, start, m, LWS_WRITE_HTTP_HEADERS);
	if (n != m) {
		lwsl_err("_write returned %d from %d\n", n, m);

		return -1;
	}

	/*
	 * alright clean up, set our state to generic ws established, the
	 * mode / state of the nwsi will get the h2 processing done.
	 */

	lwsi_set_state(wsi, LRS_ESTABLISHED);
	wsi->lws_rx_parse_state = 0; // ==LWS_RXPS_NEW;

	uri_ptr = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_COLON_PATH);
	n = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COLON_PATH);
	hit = lws_find_mount(wsi, uri_ptr, n);

	if (hit && hit->cgienv &&
	    wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP_PMO, wsi->user_space,
				    (void *)hit->cgienv, 0))
		return 1;

	return 0;
}

int
lws_read_h2(struct lws *wsi, unsigned char *buf, lws_filepos_t len)
{
	unsigned char *oldbuf = buf;
	lws_filepos_t body_chunk_len;

	// lwsl_notice("%s: h2 path: wsistate 0x%x len %d\n", __func__,
	//		wsi->wsistate, (int)len);

	/*
	 * wsi here is always the network connection wsi, not a stream
	 * wsi.  Once we unpicked the framing we will find the right
	 * swsi and make it the target of the frame.
	 *
	 * If it's ws over h2, the nwsi will get us here to do the h2
	 * processing, and that will call us back with the swsi +
	 * ESTABLISHED state for the inner payload, handled in a later
	 * case.
	 */
	while (len) {
		int m;

		/*
		 * we were accepting input but now we stopped doing so
		 */
		if (lws_is_flowcontrolled(wsi)) {
			lws_rxflow_cache(wsi, buf, 0, (int)len);
			buf += len;
			len = 0;
			break;
		}

		/*
		 * lws_h2_parser() may send something; when it gets the
		 * whole frame, it will want to perform some action
		 * involving a reply.  But we may be in a partial send
		 * situation on the network wsi...
		 *
		 * Even though we may be in a partial send and unable to
		 * send anything new, we still have to parse the network
		 * wsi in order to gain tx credit to send, which is
		 * potentially necessary to clear the old partial send.
		 *
		 * ALL network wsi-specific frames are sent by PPS
		 * already, these are sent as a priority on the writable
		 * handler, and so respect partial sends.  The only
		 * problem is when a stream wsi wants to send an, eg,
		 * reply headers frame in response to the parsing
		 * we will do now... the *stream wsi* must stall in a
		 * different state until it is able to do so from a
		 * priority on the WRITABLE callback, same way that
		 * file transfers operate.
		 */

		m = lws_h2_parser(wsi, buf, len, &body_chunk_len);
		if (m && m != 2) {
			lwsl_debug("%s: http2_parser bail: %d\n", __func__, m);
			lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS,
					   "lws_read_h2 bail");

			return -1;
		}
		if (m == 2) {
			/* swsi has been closed */
			buf += body_chunk_len;
			len -= body_chunk_len;
			break;
		}

		buf += body_chunk_len;
		len -= body_chunk_len;
	}

	return lws_ptr_diff(buf, oldbuf);
}