/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "private-lib-core.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
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 (%d)\n", __func__,
sid, (int)h2n->highest_sid_opened);
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;
#if defined(LWS_WITH_SERVER_STATUS)
wsi->vhost->conn_stats.h2_subs++;
#endif
/* get the ball rolling */
lws_validity_confirmed(wsi);
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_WITH_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);
#if defined(LWS_WITH_SERVER_STATUS)
wsi->vhost->conn_stats.h2_subs++;
#endif
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, (int)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__, (int)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_WITH_CLIENT)
#if defined(LWS_AMAZON_RTOS) || defined(LWS_AMAZON_LINUX)
if (
#else
if (wsi->flags & LCCSCF_H2_QUIRK_OVERFLOWS_TXCR &&
#endif
b == 0x7fffffff) {
b >>= 4;
break;
}
#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 - (unsigned int)settings->s[a],
w->h2.tx_cr + b - (unsigned int)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 = lws_get_network_wsi(wsi);
if (!wsi->http2_substream && !nwsi->upgraded_to_http2)
return ~0x80000000;
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,
(unsigned int)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);
#if defined(LWS_WITH_FILE_OPS)
wsi->http.fop_fd = NULL;
#endif
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");
#if defined(LWS_WITH_SERVER_STATUS)
wsi->vhost->conn_stats.h2_trans++;
#endif
#if defined(LWS_WITH_SERVER)
if (lws_http_action(h2n->swsi))
goto bail;
#endif
break;
}
break;
/*
* h2 only has PING... ACK = 0 = ping, ACK = 1 = pong
*/
case LWS_H2_PPS_PING:
case LWS_H2_PPS_PONG:
if (pps->type == LWS_H2_PPS_PING)
lwsl_info("sending PING\n");
else {
lwsl_info("sending PONG\n");
flags = LWS_H2_FLAG_SETTINGS_ACK;
}
memcpy(&set[LWS_PRE], pps->u.ping.ping_payload, 8);
n = lws_h2_frame_write(wsi, LWS_H2_FRAME_TYPE_PING, flags,
LWS_H2_STREAM_ID_MASTER, 8,
&set[LWS_PRE]);
if (n != 8)
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",
(int)pps->u.update_window.sid,
(int)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;
}
static int
lws_h2_parse_end_of_frame(struct lws *wsi);
/*
* 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)
lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE,
wsi->vhost->keepalive_timeout ?
wsi->vhost->keepalive_timeout : 31);
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, (unsigned int)h2n->sid,
(unsigned int)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", (unsigned int)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_WITH_CLIENT)
&& wsi->client_h2_alpn
#endif
) {
lwsl_notice("ignoring straggling data fl 0x%x\n",
h2n->flags);
/* 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, (unsigned int)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 %u (got %d on sid %u)\n",
__func__, (unsigned int)h2n->cont_exp_sid, h2n->type,
(unsigned int)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 %u, flags 0x%x, len %u\n",
(unsigned int)h2n->sid, h2n->flags,
(unsigned int)h2n->length);
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;
}
if (h2n->length == 0)
lws_h2_parse_end_of_frame(wsi);
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 &&
#if defined(LWS_WITH_CLIENT)
(!(wsi->flags & LCCSCF_H2_QUIRK_NGHTTP2_END_STREAM) ||
#else
(
#endif
!wsi->h2_acked_settings)) {
pps = lws_h2_new_pps(LWS_H2_PPS_ACK_SETTINGS);
if (!pps)
return 1;
lws_pps_schedule(wsi, pps);
wsi->h2_acked_settings = 1;
}
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 = %u %d %d\n",
(unsigned int)h2n->sid, (int)h2n->cont_exp,
(int)h2n->cont_exp_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 = %u\n",
(unsigned int)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_WITH_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 %u mapped "
"to wsi %p\n", wsi,
(unsigned int)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);
if (lws_check_opt(h2n->swsi->vhost->options,
LWS_SERVER_OPTION_VH_H2_HALF_CLOSED_LONG_POLL)) {
/*
* We don't directly timeout streams that enter the
* half-closed remote state, allowing immortal long
* poll
*/
lws_http_mark_immortal(h2n->swsi);
lwsl_info("%s: %p: h2 stream entering long poll\n",
__func__, h2n->swsi);
} else {
h2n->swsi->h2.END_STREAM =
!!(h2n->flags & LWS_H2_FLAG_END_STREAM);
lwsl_debug("%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_WITH_CLIENT)
if (wsi->client_h2_alpn && !wsi->client_h2_migrated &&
!(h2n->flags & LWS_H2_FLAG_SETTINGS_ACK)) {
struct lws_h2_protocol_send *pps;
/* migrate original client ask on to substream 1 */
#if defined(LWS_WITH_FILE_OPS)
wsi->http.fop_fd = NULL;
#endif
lwsl_info("%s: migrating\n", __func__);
wsi->client_h2_migrated = 1;
/*
* 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;
#if defined(LWS_WITH_CLIENT)
h2n->swsi->flags = wsi->flags;
#endif
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);
if (!wsi->h2_acked_settings
#if defined(LWS_WITH_CLIENT)
|| !(wsi->flags & LCCSCF_H2_QUIRK_NGHTTP2_END_STREAM)
#endif
) {
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__);
wsi->h2_acked_settings = 1;
}
/* 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");
h2n->cont_exp_sid = h2n->sid;
h2n->cont_exp = 1;
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 %u)\n",
h2n->hpack, h2n->type,
(unsigned int)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_WITH_CLIENT)
if (h2n->swsi->client_h2_substream) {
if (lws_client_interpret_server_handshake(h2n->swsi)) {
lwsl_info("%s: cli int serv hs closed it\n", __func__);
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_WITH_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
#if defined(LWS_WITH_SERVER_STATUS)
wsi->vhost->conn_stats.h2_trans++;
#endif
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__,
(unsigned int)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_WITH_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
lws_validity_confirmed(wsi);
} 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 %u %u (0x%x)\n",
(unsigned int)h2n->sid,
(unsigned int)h2n->hpack_e_dep,
(unsigned int)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 %u, error 0x%08X, string '%s'\n",
(unsigned int)h2n->goaway_last_sid,
(unsigned int)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 %u: reason 0x%x\n",
(unsigned int)h2n->sid, (unsigned int)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);
lws_validity_confirmed(wsi);
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",
(unsigned int)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: fl 0x%x\n",
__func__, h2n->flags);
/*
* 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,
wsi->vhost->keepalive_timeout ?
wsi->vhost->keepalive_timeout : 31);
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_WITH_CLIENT)
if (h2n->swsi->client_h2_substream) {
if (!h2n->swsi->protocol) {
lwsl_err("%s: swsi %pdoesn't have protocol\n", __func__, h2n->swsi);
m = 1;
} else
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("%s: appending because we are in LRS_DEFERRING_ACTION\n", __func__);
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 %u / %u\n",
__func__, n,
(unsigned int)h2n->count,
(unsigned int)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",
(unsigned int)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 %u %u\n",
__func__, (unsigned int)h2n->count,
(unsigned int)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;
}
#if defined(LWS_WITH_CLIENT)
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, *p1, *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, m;
/*
* 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 / 2) - 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", 5,
&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;
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HOST,
(unsigned char *)lws_hdr_simple_ptr(wsi,
_WSI_TOKEN_CLIENT_HOST),
lws_hdr_total_length(wsi, _WSI_TOKEN_CLIENT_HOST),
&p, end))
goto fail_length;
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_USER_AGENT,
(unsigned char *)"lwsss", 5,
&p, end))
goto fail_length;
if (wsi->flags & LCCSCF_HTTP_MULTIPART_MIME) {
p1 = lws_http_multipart_headers(wsi, p);
if (!p1)
goto fail_length;
p = p1;
}
if (wsi->flags & LCCSCF_HTTP_X_WWW_FORM_URLENCODED) {
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE,
(unsigned char *)"application/x-www-form-urlencoded",
33, &p, end))
goto fail_length;
lws_client_http_body_pending(wsi, 1);
}
/* 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;
// lwsl_hexdump_notice(start, p - start);
#if defined(LWS_WITH_DETAILED_LATENCY)
wsi->detlat.earliest_write_req_pre_write = lws_now_usecs();
#endif
m = LWS_WRITE_HTTP_HEADERS;
#if defined(LWS_WITH_CLIENT)
/* below is not needed in spec, indeed it destroys the long poll
* feature, but required by nghttp2 */
if (wsi->flags & LCCSCF_H2_QUIRK_NGHTTP2_END_STREAM)
m |= LWS_WRITE_H2_STREAM_END;
#endif
n = lws_write(wsi, start, p - start, m);
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;
}
#endif
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;
lws_validity_confirmed(wsi);
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);
}
int
lws_h2_client_stream_long_poll_rxonly(struct lws *wsi)
{
if (!wsi->http2_substream)
return 1;
/*
* Elect to send an empty DATA with END_STREAM, to force the stream
* into HALF_CLOSED LOCAL
*/
wsi->h2.long_poll = 1;
wsi->h2.send_END_STREAM = 1;
lws_header_table_detach(wsi, 0);
lws_callback_on_writable(wsi);
return 0;
}