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apache / httpd / 0971bc554d5f38ba065d4d6977e075a1f94b5264 / . / modules / http2 / h2_session.c
blob: d4b152019d0e928c7d1001f1c8100dcd0a53ecf2 [file] [log] [blame]
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <assert.h>
#include <stddef.h>
#include <apr_thread_cond.h>
#include <apr_base64.h>
#include <apr_strings.h>
#include <ap_mpm.h>
#include <httpd.h>
#include <http_core.h>
#include <http_config.h>
#include <http_log.h>
#include <scoreboard.h>
#include <mpm_common.h>
#include "h2_private.h"
#include "h2.h"
#include "h2_bucket_beam.h"
#include "h2_bucket_eos.h"
#include "h2_config.h"
#include "h2_ctx.h"
#include "h2_filter.h"
#include "h2_h2.h"
#include "h2_mplx.h"
#include "h2_push.h"
#include "h2_request.h"
#include "h2_headers.h"
#include "h2_stream.h"
#include "h2_task.h"
#include "h2_session.h"
#include "h2_util.h"
#include "h2_version.h"
#include "h2_workers.h"
static apr_status_t dispatch_master(h2_session *session);
static apr_status_t h2_session_read(h2_session *session, int block);
static void transit(h2_session *session, const char *action,
h2_session_state nstate);
static void on_stream_state_enter(void *ctx, h2_stream *stream);
static void on_stream_state_event(void *ctx, h2_stream *stream, h2_stream_event_t ev);
static void on_stream_event(void *ctx, h2_stream *stream, h2_stream_event_t ev);
static int h2_session_status_from_apr_status(apr_status_t rv)
{
if (rv == APR_SUCCESS) {
return NGHTTP2_NO_ERROR;
}
else if (APR_STATUS_IS_EAGAIN(rv)) {
return NGHTTP2_ERR_WOULDBLOCK;
}
else if (APR_STATUS_IS_EOF(rv)) {
return NGHTTP2_ERR_EOF;
}
return NGHTTP2_ERR_PROTO;
}
static h2_stream *get_stream(h2_session *session, int stream_id)
{
return nghttp2_session_get_stream_user_data(session->ngh2, stream_id);
}
static void dispatch_event(h2_session *session, h2_session_event_t ev,
int err, const char *msg);
void h2_session_event(h2_session *session, h2_session_event_t ev,
int err, const char *msg)
{
dispatch_event(session, ev, err, msg);
}
static int rst_unprocessed_stream(h2_stream *stream, void *ctx)
{
int unprocessed = (!h2_stream_was_closed(stream)
&& (H2_STREAM_CLIENT_INITIATED(stream->id)?
(!stream->session->local.accepting
&& stream->id > stream->session->local.accepted_max)
:
(!stream->session->remote.accepting
&& stream->id > stream->session->remote.accepted_max))
);
if (unprocessed) {
h2_stream_rst(stream, H2_ERR_NO_ERROR);
return 0;
}
return 1;
}
static void cleanup_unprocessed_streams(h2_session *session)
{
h2_mplx_stream_do(session->mplx, rst_unprocessed_stream, session);
}
static h2_stream *h2_session_open_stream(h2_session *session, int stream_id,
int initiated_on)
{
h2_stream * stream;
apr_pool_t *stream_pool;
apr_pool_create(&stream_pool, session->pool);
apr_pool_tag(stream_pool, "h2_stream");
stream = h2_stream_create(stream_id, stream_pool, session,
session->monitor, initiated_on);
if (stream) {
nghttp2_session_set_stream_user_data(session->ngh2, stream_id, stream);
}
return stream;
}
/**
* Determine the importance of streams when scheduling tasks.
* - if both stream depend on the same one, compare weights
* - if one stream is closer to the root, prioritize that one
* - if both are on the same level, use the weight of their root
* level ancestors
*/
static int spri_cmp(int sid1, nghttp2_stream *s1,
int sid2, nghttp2_stream *s2, h2_session *session)
{
nghttp2_stream *p1, *p2;
p1 = nghttp2_stream_get_parent(s1);
p2 = nghttp2_stream_get_parent(s2);
if (p1 == p2) {
int32_t w1, w2;
w1 = nghttp2_stream_get_weight(s1);
w2 = nghttp2_stream_get_weight(s2);
return w2 - w1;
}
else if (!p1) {
/* stream 1 closer to root */
return -1;
}
else if (!p2) {
/* stream 2 closer to root */
return 1;
}
return spri_cmp(sid1, p1, sid2, p2, session);
}
static int stream_pri_cmp(int sid1, int sid2, void *ctx)
{
h2_session *session = ctx;
nghttp2_stream *s1, *s2;
s1 = nghttp2_session_find_stream(session->ngh2, sid1);
s2 = nghttp2_session_find_stream(session->ngh2, sid2);
if (s1 == s2) {
return 0;
}
else if (!s1) {
return 1;
}
else if (!s2) {
return -1;
}
return spri_cmp(sid1, s1, sid2, s2, session);
}
/*
* Callback when nghttp2 wants to send bytes back to the client.
*/
static ssize_t send_cb(nghttp2_session *ngh2,
const uint8_t *data, size_t length,
int flags, void *userp)
{
h2_session *session = (h2_session *)userp;
apr_status_t status;
(void)ngh2;
(void)flags;
status = h2_conn_io_write(&session->io, (const char *)data, length);
if (status == APR_SUCCESS) {
return length;
}
if (APR_STATUS_IS_EAGAIN(status)) {
return NGHTTP2_ERR_WOULDBLOCK;
}
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, session->c, APLOGNO(03062)
"h2_session: send error");
return h2_session_status_from_apr_status(status);
}
static int on_invalid_frame_recv_cb(nghttp2_session *ngh2,
const nghttp2_frame *frame,
int error, void *userp)
{
h2_session *session = (h2_session *)userp;
(void)ngh2;
if (APLOGcdebug(session->c)) {
char buffer[256];
h2_util_frame_print(frame, buffer, sizeof(buffer)/sizeof(buffer[0]));
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_SSSN_LOG(APLOGNO(03063), session,
"recv invalid FRAME[%s], frames=%ld/%ld (r/s)"),
buffer, (long)session->frames_received,
(long)session->frames_sent);
}
return 0;
}
static int on_data_chunk_recv_cb(nghttp2_session *ngh2, uint8_t flags,
int32_t stream_id,
const uint8_t *data, size_t len, void *userp)
{
h2_session *session = (h2_session *)userp;
apr_status_t status = APR_EINVAL;
h2_stream * stream;
int rv = 0;
stream = get_stream(session, stream_id);
if (stream) {
status = h2_stream_recv_DATA(stream, flags, data, len);
dispatch_event(session, H2_SESSION_EV_STREAM_CHANGE, 0, "stream data rcvd");
}
else {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c, APLOGNO(03064)
"h2_stream(%ld-%d): on_data_chunk for unknown stream",
session->id, (int)stream_id);
rv = NGHTTP2_ERR_CALLBACK_FAILURE;
}
if (status != APR_SUCCESS) {
/* count this as consumed explicitly as no one will read it */
nghttp2_session_consume(session->ngh2, stream_id, len);
}
return rv;
}
static int on_stream_close_cb(nghttp2_session *ngh2, int32_t stream_id,
uint32_t error_code, void *userp)
{
h2_session *session = (h2_session *)userp;
h2_stream *stream;
(void)ngh2;
stream = get_stream(session, stream_id);
if (stream) {
if (error_code) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_STRM_LOG(APLOGNO(03065), stream,
"closing with err=%d %s"),
(int)error_code, h2_h2_err_description(error_code));
h2_stream_rst(stream, error_code);
}
}
return 0;
}
static int on_begin_headers_cb(nghttp2_session *ngh2,
const nghttp2_frame *frame, void *userp)
{
h2_session *session = (h2_session *)userp;
h2_stream *s;
/* We may see HEADERs at the start of a stream or after all DATA
* streams to carry trailers. */
(void)ngh2;
s = get_stream(session, frame->hd.stream_id);
if (s) {
/* nop */
}
else {
s = h2_session_open_stream(userp, frame->hd.stream_id, 0);
}
return s? 0 : NGHTTP2_ERR_START_STREAM_NOT_ALLOWED;
}
static int on_header_cb(nghttp2_session *ngh2, const nghttp2_frame *frame,
const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
uint8_t flags,
void *userp)
{
h2_session *session = (h2_session *)userp;
h2_stream * stream;
apr_status_t status;
(void)flags;
stream = get_stream(session, frame->hd.stream_id);
if (!stream) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c, APLOGNO(02920)
"h2_stream(%ld-%d): on_header unknown stream",
session->id, (int)frame->hd.stream_id);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
status = h2_stream_add_header(stream, (const char *)name, namelen,
(const char *)value, valuelen);
if (status != APR_SUCCESS && !h2_stream_is_ready(stream)) {
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
return 0;
}
/**
* nghttp2 session has received a complete frame. Most are used by nghttp2
* for processing of internal state. Some, like HEADER and DATA frames,
* we need to act on.
*/
static int on_frame_recv_cb(nghttp2_session *ng2s,
const nghttp2_frame *frame,
void *userp)
{
h2_session *session = (h2_session *)userp;
h2_stream *stream;
apr_status_t rv = APR_SUCCESS;
if (APLOGcdebug(session->c)) {
char buffer[256];
h2_util_frame_print(frame, buffer, sizeof(buffer)/sizeof(buffer[0]));
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_SSSN_LOG(APLOGNO(03066), session,
"recv FRAME[%s], frames=%ld/%ld (r/s)"),
buffer, (long)session->frames_received,
(long)session->frames_sent);
}
++session->frames_received;
switch (frame->hd.type) {
case NGHTTP2_HEADERS:
/* This can be HEADERS for a new stream, defining the request,
* or HEADER may come after DATA at the end of a stream as in
* trailers */
stream = get_stream(session, frame->hd.stream_id);
if (stream) {
rv = h2_stream_recv_frame(stream, NGHTTP2_HEADERS, frame->hd.flags,
frame->hd.length + H2_FRAME_HDR_LEN);
}
break;
case NGHTTP2_DATA:
stream = get_stream(session, frame->hd.stream_id);
if (stream) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_STRM_LOG(APLOGNO(02923), stream,
"DATA, len=%ld, flags=%d"),
(long)frame->hd.length, frame->hd.flags);
rv = h2_stream_recv_frame(stream, NGHTTP2_DATA, frame->hd.flags,
frame->hd.length + H2_FRAME_HDR_LEN);
}
break;
case NGHTTP2_PRIORITY:
session->reprioritize = 1;
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c,
"h2_stream(%ld-%d): PRIORITY frame "
" weight=%d, dependsOn=%d, exclusive=%d",
session->id, (int)frame->hd.stream_id,
frame->priority.pri_spec.weight,
frame->priority.pri_spec.stream_id,
frame->priority.pri_spec.exclusive);
break;
case NGHTTP2_WINDOW_UPDATE:
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c,
"h2_stream(%ld-%d): WINDOW_UPDATE incr=%d",
session->id, (int)frame->hd.stream_id,
frame->window_update.window_size_increment);
if (nghttp2_session_want_write(session->ngh2)) {
dispatch_event(session, H2_SESSION_EV_FRAME_RCVD, 0, "window update");
}
break;
case NGHTTP2_RST_STREAM:
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c, APLOGNO(03067)
"h2_stream(%ld-%d): RST_STREAM by client, errror=%d",
session->id, (int)frame->hd.stream_id,
(int)frame->rst_stream.error_code);
stream = get_stream(session, frame->hd.stream_id);
if (stream && stream->initiated_on) {
++session->pushes_reset;
}
else {
++session->streams_reset;
}
break;
case NGHTTP2_GOAWAY:
if (frame->goaway.error_code == 0
&& frame->goaway.last_stream_id == ((1u << 31) - 1)) {
/* shutdown notice. Should not come from a client... */
session->remote.accepting = 0;
}
else {
session->remote.accepted_max = frame->goaway.last_stream_id;
dispatch_event(session, H2_SESSION_EV_REMOTE_GOAWAY,
frame->goaway.error_code, NULL);
}
break;
case NGHTTP2_SETTINGS:
if (APLOGctrace2(session->c)) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c,
H2_SSSN_MSG(session, "SETTINGS, len=%ld"), (long)frame->hd.length);
}
break;
default:
if (APLOGctrace2(session->c)) {
char buffer[256];
h2_util_frame_print(frame, buffer,
sizeof(buffer)/sizeof(buffer[0]));
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c,
H2_SSSN_MSG(session, "on_frame_rcv %s"), buffer);
}
break;
}
if (session->state == H2_SESSION_ST_IDLE) {
/* We received a frame, but session is in state IDLE. That means the frame
* did not really progress any of the (possibly) open streams. It was a meta
* frame, e.g. SETTINGS/WINDOW_UPDATE/unknown/etc.
* Remember: IDLE means we cannot send because either there are no streams open or
* all open streams are blocked on exhausted WINDOWs for outgoing data.
* The more frames we receive that do not change this, the less interested we
* become in serving this connection. This is expressed in increasing "idle_delays".
* Eventually, the connection will timeout and we'll close it. */
session->idle_frames = H2MIN(session->idle_frames + 1, session->frames_received);
ap_log_cerror( APLOG_MARK, APLOG_TRACE2, 0, session->c,
H2_SSSN_MSG(session, "session has %ld idle frames"),
(long)session->idle_frames);
if (session->idle_frames > 10) {
apr_size_t busy_frames = H2MAX(session->frames_received - session->idle_frames, 1);
int idle_ratio = (int)(session->idle_frames / busy_frames);
if (idle_ratio > 100) {
session->idle_delay = apr_time_from_msec(H2MIN(1000, idle_ratio));
}
else if (idle_ratio > 10) {
session->idle_delay = apr_time_from_msec(10);
}
else if (idle_ratio > 1) {
session->idle_delay = apr_time_from_msec(1);
}
else {
session->idle_delay = 0;
}
}
}
if (APR_SUCCESS != rv) return NGHTTP2_ERR_PROTO;
return 0;
}
static int h2_session_continue_data(h2_session *session) {
if (h2_mplx_has_master_events(session->mplx)) {
return 0;
}
if (h2_conn_io_needs_flush(&session->io)) {
return 0;
}
return 1;
}
static char immortal_zeros[H2_MAX_PADLEN];
static int on_send_data_cb(nghttp2_session *ngh2,
nghttp2_frame *frame,
const uint8_t *framehd,
size_t length,
nghttp2_data_source *source,
void *userp)
{
apr_status_t status = APR_SUCCESS;
h2_session *session = (h2_session *)userp;
int stream_id = (int)frame->hd.stream_id;
unsigned char padlen;
int eos;
h2_stream *stream;
apr_bucket *b;
apr_off_t len = length;
(void)ngh2;
(void)source;
if (!h2_session_continue_data(session)) {
return NGHTTP2_ERR_WOULDBLOCK;
}
ap_assert(frame->data.padlen <= (H2_MAX_PADLEN+1));
padlen = (unsigned char)frame->data.padlen;
stream = get_stream(session, stream_id);
if (!stream) {
ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_NOTFOUND, session->c,
APLOGNO(02924)
"h2_stream(%ld-%d): send_data, stream not found",
session->id, (int)stream_id);
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c,
H2_STRM_MSG(stream, "send_data_cb for %ld bytes"),
(long)length);
status = h2_conn_io_write(&session->io, (const char *)framehd, H2_FRAME_HDR_LEN);
if (padlen && status == APR_SUCCESS) {
--padlen;
status = h2_conn_io_write(&session->io, (const char *)&padlen, 1);
}
if (status != APR_SUCCESS) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, status, session->c,
H2_STRM_MSG(stream, "writing frame header"));
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
status = h2_stream_read_to(stream, session->bbtmp, &len, &eos);
if (status != APR_SUCCESS) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, status, session->c,
H2_STRM_MSG(stream, "send_data_cb, reading stream"));
apr_brigade_cleanup(session->bbtmp);
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
else if (len != length) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, status, session->c,
H2_STRM_MSG(stream, "send_data_cb, wanted %ld bytes, "
"got %ld from stream"), (long)length, (long)len);
apr_brigade_cleanup(session->bbtmp);
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
if (padlen) {
b = apr_bucket_immortal_create(immortal_zeros, padlen,
session->c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(session->bbtmp, b);
}
status = h2_conn_io_pass(&session->io, session->bbtmp);
apr_brigade_cleanup(session->bbtmp);
if (status == APR_SUCCESS) {
stream->out_data_frames++;
stream->out_data_octets += length;
return 0;
}
else {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, session->c,
H2_STRM_LOG(APLOGNO(02925), stream, "failed send_data_cb"));
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
}
static int on_frame_send_cb(nghttp2_session *ngh2,
const nghttp2_frame *frame,
void *user_data)
{
h2_session *session = user_data;
h2_stream *stream;
int stream_id = frame->hd.stream_id;
++session->frames_sent;
switch (frame->hd.type) {
case NGHTTP2_PUSH_PROMISE:
/* PUSH_PROMISE we report on the promised stream */
stream_id = frame->push_promise.promised_stream_id;
break;
default:
break;
}
if (APLOGcdebug(session->c)) {
char buffer[256];
h2_util_frame_print(frame, buffer, sizeof(buffer)/sizeof(buffer[0]));
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_SSSN_LOG(APLOGNO(03068), session,
"sent FRAME[%s], frames=%ld/%ld (r/s)"),
buffer, (long)session->frames_received,
(long)session->frames_sent);
}
stream = get_stream(session, stream_id);
if (stream) {
h2_stream_send_frame(stream, frame->hd.type, frame->hd.flags,
frame->hd.length + H2_FRAME_HDR_LEN);
}
return 0;
}
#ifdef H2_NG2_INVALID_HEADER_CB
static int on_invalid_header_cb(nghttp2_session *ngh2,
const nghttp2_frame *frame,
const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
uint8_t flags, void *user_data)
{
h2_session *session = user_data;
h2_stream *stream;
if (APLOGcdebug(session->c)) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c, APLOGNO(03456)
"h2_stream(%ld-%d): invalid header '%s: %s'",
session->id, (int)frame->hd.stream_id,
apr_pstrndup(session->pool, (const char *)name, namelen),
apr_pstrndup(session->pool, (const char *)value, valuelen));
}
stream = get_stream(session, frame->hd.stream_id);
if (stream) {
h2_stream_rst(stream, NGHTTP2_PROTOCOL_ERROR);
}
return 0;
}
#endif
static ssize_t select_padding_cb(nghttp2_session *ngh2,
const nghttp2_frame *frame,
size_t max_payloadlen, void *user_data)
{
h2_session *session = user_data;
ssize_t frame_len = frame->hd.length + H2_FRAME_HDR_LEN; /* the total length without padding */
ssize_t padded_len = frame_len;
/* Determine # of padding bytes to append to frame. Unless session->padding_always
* the number my be capped by the ui.write_size that currently applies.
*/
if (session->padding_max) {
int n = ap_random_pick(0, session->padding_max);
padded_len = H2MIN(max_payloadlen + H2_FRAME_HDR_LEN, frame_len + n);
}
if (padded_len != frame_len) {
if (!session->padding_always && session->io.write_size
&& (padded_len > session->io.write_size)
&& (frame_len <= session->io.write_size)) {
padded_len = session->io.write_size;
}
if (APLOGctrace2(session->c)) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c,
"select padding from [%d, %d]: %d (frame length: 0x%04x, write size: %d)",
(int)frame_len, (int)max_payloadlen+H2_FRAME_HDR_LEN,
(int)(padded_len - frame_len), (int)padded_len, (int)session->io.write_size);
}
return padded_len - H2_FRAME_HDR_LEN;
}
return frame->hd.length;
}
#define NGH2_SET_CALLBACK(callbacks, name, fn)\
nghttp2_session_callbacks_set_##name##_callback(callbacks, fn)
static apr_status_t init_callbacks(conn_rec *c, nghttp2_session_callbacks **pcb)
{
int rv = nghttp2_session_callbacks_new(pcb);
if (rv != 0) {
ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c,
APLOGNO(02926) "nghttp2_session_callbacks_new: %s",
nghttp2_strerror(rv));
return APR_EGENERAL;
}
NGH2_SET_CALLBACK(*pcb, send, send_cb);
NGH2_SET_CALLBACK(*pcb, on_frame_recv, on_frame_recv_cb);
NGH2_SET_CALLBACK(*pcb, on_invalid_frame_recv, on_invalid_frame_recv_cb);
NGH2_SET_CALLBACK(*pcb, on_data_chunk_recv, on_data_chunk_recv_cb);
NGH2_SET_CALLBACK(*pcb, on_stream_close, on_stream_close_cb);
NGH2_SET_CALLBACK(*pcb, on_begin_headers, on_begin_headers_cb);
NGH2_SET_CALLBACK(*pcb, on_header, on_header_cb);
NGH2_SET_CALLBACK(*pcb, send_data, on_send_data_cb);
NGH2_SET_CALLBACK(*pcb, on_frame_send, on_frame_send_cb);
#ifdef H2_NG2_INVALID_HEADER_CB
NGH2_SET_CALLBACK(*pcb, on_invalid_header, on_invalid_header_cb);
#endif
NGH2_SET_CALLBACK(*pcb, select_padding, select_padding_cb);
return APR_SUCCESS;
}
static apr_status_t h2_session_shutdown_notice(h2_session *session)
{
apr_status_t status;
ap_assert(session);
if (!session->local.accepting) {
return APR_SUCCESS;
}
nghttp2_submit_shutdown_notice(session->ngh2);
session->local.accepting = 0;
status = nghttp2_session_send(session->ngh2);
if (status == APR_SUCCESS) {
status = h2_conn_io_flush(&session->io);
}
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_SSSN_LOG(APLOGNO(03457), session, "sent shutdown notice"));
return status;
}
static apr_status_t h2_session_shutdown(h2_session *session, int error,
const char *msg, int force_close)
{
apr_status_t status = APR_SUCCESS;
ap_assert(session);
if (session->local.shutdown) {
return APR_SUCCESS;
}
if (!msg && error) {
msg = nghttp2_strerror(error);
}
if (error || force_close) {
/* not a graceful shutdown, we want to leave...
* Do not start further streams that are waiting to be scheduled.
* Find out the max stream id that we habe been processed or
* are still actively working on.
* Remove all streams greater than this number without submitting
* a RST_STREAM frame, since that should be clear from the GOAWAY
* we send. */
session->local.accepted_max = h2_mplx_shutdown(session->mplx);
session->local.error = error;
}
else {
/* graceful shutdown. we will continue processing all streams
* we have, but no longer accept new ones. Report the max stream
* we have received and discard all new ones. */
}
session->local.accepting = 0;
session->local.shutdown = 1;
if (!session->c->aborted) {
nghttp2_submit_goaway(session->ngh2, NGHTTP2_FLAG_NONE,
session->local.accepted_max,
error, (uint8_t*)msg, msg? strlen(msg):0);
status = nghttp2_session_send(session->ngh2);
if (status == APR_SUCCESS) {
status = h2_conn_io_flush(&session->io);
}
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_SSSN_LOG(APLOGNO(03069), session,
"sent GOAWAY, err=%d, msg=%s"), error, msg? msg : "");
}
dispatch_event(session, H2_SESSION_EV_LOCAL_GOAWAY, error, msg);
return status;
}
static apr_status_t session_cleanup(h2_session *session, const char *trigger)
{
conn_rec *c = session->c;
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
H2_SSSN_MSG(session, "pool_cleanup"));
if (session->state != H2_SESSION_ST_DONE
&& session->state != H2_SESSION_ST_INIT) {
/* Not good. The connection is being torn down and we have
* not sent a goaway. This is considered a protocol error and
* the client has to assume that any streams "in flight" may have
* been processed and are not safe to retry.
* As clients with idle connection may only learn about a closed
* connection when sending the next request, this has the effect
* that at least this one request will fail.
*/
ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, c,
H2_SSSN_LOG(APLOGNO(03199), session,
"connection disappeared without proper "
"goodbye, clients will be confused, should not happen"));
}
transit(session, trigger, H2_SESSION_ST_CLEANUP);
h2_mplx_release_and_join(session->mplx, session->iowait);
session->mplx = NULL;
ap_assert(session->ngh2);
nghttp2_session_del(session->ngh2);
session->ngh2 = NULL;
h2_ctx_clear(c);
return APR_SUCCESS;
}
static apr_status_t session_pool_cleanup(void *data)
{
conn_rec *c = data;
h2_session *session;
if ((session = h2_ctx_get_session(c))) {
/* if the session is still there, now is the last chance
* to perform cleanup. Normally, cleanup should have happened
* earlier in the connection pre_close. Main reason is that
* any ongoing requests on slave connections might still access
* data which has, at this time, already been freed. An example
* is mod_ssl that uses request hooks. */
ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, c,
H2_SSSN_LOG(APLOGNO(10020), session,
"session cleanup triggered by pool cleanup. "
"this should have happened earlier already."));
return session_cleanup(session, "pool cleanup");
}
return APR_SUCCESS;
}
apr_status_t h2_session_create(h2_session **psession, conn_rec *c, request_rec *r,
server_rec *s, h2_workers *workers)
{
nghttp2_session_callbacks *callbacks = NULL;
nghttp2_option *options = NULL;
apr_allocator_t *allocator;
apr_thread_mutex_t *mutex;
uint32_t n;
apr_pool_t *pool = NULL;
h2_session *session;
apr_status_t status;
int rv;
*psession = NULL;
status = apr_allocator_create(&allocator);
if (status != APR_SUCCESS) {
return status;
}
apr_allocator_max_free_set(allocator, ap_max_mem_free);
apr_pool_create_ex(&pool, c->pool, NULL, allocator);
if (!pool) {
apr_allocator_destroy(allocator);
return APR_ENOMEM;
}
apr_pool_tag(pool, "h2_session");
apr_allocator_owner_set(allocator, pool);
status = apr_thread_mutex_create(&mutex, APR_THREAD_MUTEX_DEFAULT, pool);
if (status != APR_SUCCESS) {
apr_pool_destroy(pool);
return APR_ENOMEM;
}
apr_allocator_mutex_set(allocator, mutex);
session = apr_pcalloc(pool, sizeof(h2_session));
if (!session) {
return APR_ENOMEM;
}
*psession = session;
session->id = c->id;
session->c = c;
session->r = r;
session->s = s;
session->pool = pool;
session->workers = workers;
session->state = H2_SESSION_ST_INIT;
session->local.accepting = 1;
session->remote.accepting = 1;
session->max_stream_count = h2_config_sgeti(s, H2_CONF_MAX_STREAMS);
session->max_stream_mem = h2_config_sgeti(s, H2_CONF_STREAM_MAX_MEM);
status = apr_thread_cond_create(&session->iowait, session->pool);
if (status != APR_SUCCESS) {
apr_pool_destroy(pool);
return status;
}
session->in_pending = h2_iq_create(session->pool, (int)session->max_stream_count);
if (session->in_pending == NULL) {
apr_pool_destroy(pool);
return APR_ENOMEM;
}
session->in_process = h2_iq_create(session->pool, (int)session->max_stream_count);
if (session->in_process == NULL) {
apr_pool_destroy(pool);
return APR_ENOMEM;
}
session->monitor = apr_pcalloc(pool, sizeof(h2_stream_monitor));
if (session->monitor == NULL) {
apr_pool_destroy(pool);
return APR_ENOMEM;
}
session->monitor->ctx = session;
session->monitor->on_state_enter = on_stream_state_enter;
session->monitor->on_state_event = on_stream_state_event;
session->monitor->on_event = on_stream_event;
session->mplx = h2_mplx_create(c, s, session->pool, workers);
/* connection input filter that feeds the session */
session->cin = h2_filter_cin_create(session);
ap_add_input_filter("H2_IN", session->cin, r, c);
h2_conn_io_init(&session->io, c, s);
session->padding_max = h2_config_sgeti(s, H2_CONF_PADDING_BITS);
if (session->padding_max) {
session->padding_max = (0x01 << session->padding_max) - 1;
}
session->padding_always = h2_config_sgeti(s, H2_CONF_PADDING_ALWAYS);
session->bbtmp = apr_brigade_create(session->pool, c->bucket_alloc);
status = init_callbacks(c, &callbacks);
if (status != APR_SUCCESS) {
ap_log_cerror(APLOG_MARK, APLOG_ERR, status, c, APLOGNO(02927)
"nghttp2: error in init_callbacks");
apr_pool_destroy(pool);
return status;
}
rv = nghttp2_option_new(&options);
if (rv != 0) {
ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EGENERAL, c,
APLOGNO(02928) "nghttp2_option_new: %s",
nghttp2_strerror(rv));
apr_pool_destroy(pool);
return status;
}
nghttp2_option_set_peer_max_concurrent_streams(options, (uint32_t)session->max_stream_count);
/* We need to handle window updates ourself, otherwise we
* get flooded by nghttp2. */
nghttp2_option_set_no_auto_window_update(options, 1);
rv = nghttp2_session_server_new2(&session->ngh2, callbacks,
session, options);
nghttp2_session_callbacks_del(callbacks);
nghttp2_option_del(options);
if (rv != 0) {
ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EGENERAL, c,
APLOGNO(02929) "nghttp2_session_server_new: %s",
nghttp2_strerror(rv));
apr_pool_destroy(pool);
return APR_ENOMEM;
}
n = h2_config_sgeti(s, H2_CONF_PUSH_DIARY_SIZE);
session->push_diary = h2_push_diary_create(session->pool, n);
if (APLOGcdebug(c)) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c,
H2_SSSN_LOG(APLOGNO(03200), session,
"created, max_streams=%d, stream_mem=%d, "
"workers_limit=%d, workers_max=%d, "
"push_diary(type=%d,N=%d)"),
(int)session->max_stream_count,
(int)session->max_stream_mem,
session->mplx->limit_active,
session->mplx->max_active,
session->push_diary->dtype,
(int)session->push_diary->N);
}
apr_pool_pre_cleanup_register(pool, c, session_pool_cleanup);
return APR_SUCCESS;
}
static apr_status_t h2_session_start(h2_session *session, int *rv)
{
apr_status_t status = APR_SUCCESS;
nghttp2_settings_entry settings[3];
size_t slen;
int win_size;
ap_assert(session);
/* Start the conversation by submitting our SETTINGS frame */
*rv = 0;
if (session->r) {
const char *s, *cs;
apr_size_t dlen;
h2_stream * stream;
/* 'h2c' mode: we should have a 'HTTP2-Settings' header with
* base64 encoded client settings. */
s = apr_table_get(session->r->headers_in, "HTTP2-Settings");
if (!s) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, APR_EINVAL, session->r,
APLOGNO(02931)
"HTTP2-Settings header missing in request");
return APR_EINVAL;
}
cs = NULL;
dlen = h2_util_base64url_decode(&cs, s, session->pool);
if (APLOGrdebug(session->r)) {
char buffer[128];
h2_util_hex_dump(buffer, 128, (char*)cs, dlen);
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, session->r, APLOGNO(03070)
"upgrading h2c session with HTTP2-Settings: %s -> %s (%d)",
s, buffer, (int)dlen);
}
*rv = nghttp2_session_upgrade(session->ngh2, (uint8_t*)cs, dlen, NULL);
if (*rv != 0) {
status = APR_EINVAL;
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, session->r,
APLOGNO(02932) "nghttp2_session_upgrade: %s",
nghttp2_strerror(*rv));
return status;
}
/* Now we need to auto-open stream 1 for the request we got. */
stream = h2_session_open_stream(session, 1, 0);
if (!stream) {
status = APR_EGENERAL;
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, session->r,
APLOGNO(02933) "open stream 1: %s",
nghttp2_strerror(*rv));
return status;
}
status = h2_stream_set_request_rec(stream, session->r, 1);
if (status != APR_SUCCESS) {
return status;
}
}
slen = 0;
settings[slen].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS;
settings[slen].value = (uint32_t)session->max_stream_count;
++slen;
win_size = h2_config_sgeti(session->s, H2_CONF_WIN_SIZE);
if (win_size != H2_INITIAL_WINDOW_SIZE) {
settings[slen].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
settings[slen].value = win_size;
++slen;
}
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, session->c,
H2_SSSN_LOG(APLOGNO(03201), session,
"start, INITIAL_WINDOW_SIZE=%ld, MAX_CONCURRENT_STREAMS=%d"),
(long)win_size, (int)session->max_stream_count);
*rv = nghttp2_submit_settings(session->ngh2, NGHTTP2_FLAG_NONE,
settings, slen);
if (*rv != 0) {
status = APR_EGENERAL;
ap_log_cerror(APLOG_MARK, APLOG_ERR, status, session->c,
H2_SSSN_LOG(APLOGNO(02935), session,
"nghttp2_submit_settings: %s"), nghttp2_strerror(*rv));
}
else {
/* use maximum possible value for connection window size. We are only
* interested in per stream flow control. which have the initial window
* size configured above.
* Therefore, for our use, the connection window can only get in the
* way. Example: if we allow 100 streams with a 32KB window each, we
* buffer up to 3.2 MB of data. Unless we do separate connection window
* interim updates, any smaller connection window will lead to blocking
* in DATA flow.
*/
*rv = nghttp2_submit_window_update(session->ngh2, NGHTTP2_FLAG_NONE,
0, NGHTTP2_MAX_WINDOW_SIZE - win_size);
if (*rv != 0) {
status = APR_EGENERAL;
ap_log_cerror(APLOG_MARK, APLOG_ERR, status, session->c,
H2_SSSN_LOG(APLOGNO(02970), session,
"nghttp2_submit_window_update: %s"),
nghttp2_strerror(*rv));
}
}
return status;
}
static apr_status_t on_stream_headers(h2_session *session, h2_stream *stream,
h2_headers *headers, apr_off_t len,
int eos);
static ssize_t stream_data_cb(nghttp2_session *ng2s,
int32_t stream_id,
uint8_t *buf,
size_t length,
uint32_t *data_flags,
nghttp2_data_source *source,
void *puser)
{
h2_session *session = (h2_session *)puser;
apr_off_t nread = length;
int eos = 0;
apr_status_t status;
h2_stream *stream;
ap_assert(session);
/* The session wants to send more DATA for the stream. We need
* to find out how much of the requested length we can send without
* blocking.
* Indicate EOS when we encounter it or DEFERRED if the stream
* should be suspended. Beware of trailers.
*/
(void)ng2s;
(void)buf;
(void)source;
stream = get_stream(session, stream_id);
if (!stream) {
ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, session->c,
APLOGNO(02937)
"h2_stream(%ld-%d): data_cb, stream not found",
session->id, (int)stream_id);
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
status = h2_stream_out_prepare(stream, &nread, &eos, NULL);
if (nread) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c,
H2_STRM_MSG(stream, "prepared no_copy, len=%ld, eos=%d"),
(long)nread, eos);
*data_flags |= NGHTTP2_DATA_FLAG_NO_COPY;
}
switch (status) {
case APR_SUCCESS:
break;
case APR_EOF:
eos = 1;
break;
case APR_ECONNRESET:
case APR_ECONNABORTED:
return NGHTTP2_ERR_CALLBACK_FAILURE;
case APR_EAGAIN:
/* If there is no data available, our session will automatically
* suspend this stream and not ask for more data until we resume
* it. Remember at our h2_stream that we need to do this.
*/
nread = 0;
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_STRM_LOG(APLOGNO(03071), stream, "suspending"));
return NGHTTP2_ERR_DEFERRED;
default:
nread = 0;
ap_log_cerror(APLOG_MARK, APLOG_ERR, status, session->c,
H2_STRM_LOG(APLOGNO(02938), stream, "reading data"));
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
if (eos) {
*data_flags |= NGHTTP2_DATA_FLAG_EOF;
}
return (ssize_t)nread;
}
struct h2_stream *h2_session_push(h2_session *session, h2_stream *is,
h2_push *push)
{
h2_stream *stream;
h2_ngheader *ngh;
apr_status_t status;
int nid = 0;
status = h2_req_create_ngheader(&ngh, is->pool, push->req);
if (status == APR_SUCCESS) {
nid = nghttp2_submit_push_promise(session->ngh2, 0, is->id,
ngh->nv, ngh->nvlen, NULL);
}
if (status != APR_SUCCESS || nid <= 0) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, session->c,
H2_STRM_LOG(APLOGNO(03075), is,
"submitting push promise fail: %s"), nghttp2_strerror(nid));
return NULL;
}
++session->pushes_promised;
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_STRM_LOG(APLOGNO(03076), is, "SERVER_PUSH %d for %s %s on %d"),
nid, push->req->method, push->req->path, is->id);
stream = h2_session_open_stream(session, nid, is->id);
if (!stream) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_STRM_LOG(APLOGNO(03077), stream,
"failed to create stream obj %d"), nid);
/* kill the push_promise */
nghttp2_submit_rst_stream(session->ngh2, NGHTTP2_FLAG_NONE, nid,
NGHTTP2_INTERNAL_ERROR);
return NULL;
}
h2_session_set_prio(session, stream, push->priority);
h2_stream_set_request(stream, push->req);
++session->unsent_promises;
return stream;
}
static int valid_weight(float f)
{
int w = (int)f;
return (w < NGHTTP2_MIN_WEIGHT? NGHTTP2_MIN_WEIGHT :
(w > NGHTTP2_MAX_WEIGHT)? NGHTTP2_MAX_WEIGHT : w);
}
apr_status_t h2_session_set_prio(h2_session *session, h2_stream *stream,
const h2_priority *prio)
{
apr_status_t status = APR_SUCCESS;
#ifdef H2_NG2_CHANGE_PRIO
nghttp2_stream *s_grandpa, *s_parent, *s;
if (prio == NULL) {
/* we treat this as a NOP */
return APR_SUCCESS;
}
s = nghttp2_session_find_stream(session->ngh2, stream->id);
if (!s) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, session->c,
H2_STRM_MSG(stream, "lookup of nghttp2_stream failed"));
return APR_EINVAL;
}
s_parent = nghttp2_stream_get_parent(s);
if (s_parent) {
nghttp2_priority_spec ps;
int id_parent, id_grandpa, w_parent, w;
int rv = 0;
const char *ptype = "AFTER";
h2_dependency dep = prio->dependency;
id_parent = nghttp2_stream_get_stream_id(s_parent);
s_grandpa = nghttp2_stream_get_parent(s_parent);
if (s_grandpa) {
id_grandpa = nghttp2_stream_get_stream_id(s_grandpa);
}
else {
/* parent of parent does not exist,
* only possible if parent == root */
dep = H2_DEPENDANT_AFTER;
}
switch (dep) {
case H2_DEPENDANT_INTERLEAVED:
/* PUSHed stream is to be interleaved with initiating stream.
* It is made a sibling of the initiating stream and gets a
* proportional weight [1, MAX_WEIGHT] of the initiaing
* stream weight.
*/
ptype = "INTERLEAVED";
w_parent = nghttp2_stream_get_weight(s_parent);
w = valid_weight(w_parent * ((float)prio->weight / NGHTTP2_MAX_WEIGHT));
nghttp2_priority_spec_init(&ps, id_grandpa, w, 0);
break;
case H2_DEPENDANT_BEFORE:
/* PUSHed stream os to be sent BEFORE the initiating stream.
* It gets the same weight as the initiating stream, replaces
* that stream in the dependency tree and has the initiating
* stream as child.
*/
ptype = "BEFORE";
w = w_parent = nghttp2_stream_get_weight(s_parent);
nghttp2_priority_spec_init(&ps, stream->id, w_parent, 0);
id_grandpa = nghttp2_stream_get_stream_id(s_grandpa);
rv = nghttp2_session_change_stream_priority(session->ngh2, id_parent, &ps);
if (rv < 0) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c, APLOGNO(03202)
"h2_stream(%ld-%d): PUSH BEFORE, weight=%d, "
"depends=%d, returned=%d",
session->id, id_parent, ps.weight, ps.stream_id, rv);
return APR_EGENERAL;
}
nghttp2_priority_spec_init(&ps, id_grandpa, w, 0);
break;
case H2_DEPENDANT_AFTER:
/* The PUSHed stream is to be sent after the initiating stream.
* Give if the specified weight and let it depend on the intiating
* stream.
*/
/* fall through, it's the default */
default:
nghttp2_priority_spec_init(&ps, id_parent, valid_weight(prio->weight), 0);
break;
}
rv = nghttp2_session_change_stream_priority(session->ngh2, stream->id, &ps);
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_STRM_LOG(APLOGNO(03203), stream,
"PUSH %s, weight=%d, depends=%d, returned=%d"),
ptype, ps.weight, ps.stream_id, rv);
status = (rv < 0)? APR_EGENERAL : APR_SUCCESS;
}
#else
(void)session;
(void)stream;
(void)prio;
(void)valid_weight;
#endif
return status;
}
int h2_session_push_enabled(h2_session *session)
{
/* iff we can and they can and want */
return (session->remote.accepting /* remote GOAWAY received */
&& h2_config_sgeti(session->s, H2_CONF_PUSH)
&& nghttp2_session_get_remote_settings(session->ngh2,
NGHTTP2_SETTINGS_ENABLE_PUSH));
}
static apr_status_t h2_session_send(h2_session *session)
{
apr_interval_time_t saved_timeout;
int rv;
apr_socket_t *socket;
socket = ap_get_conn_socket(session->c);
if (socket) {
apr_socket_timeout_get(socket, &saved_timeout);
apr_socket_timeout_set(socket, session->s->timeout);
}
rv = nghttp2_session_send(session->ngh2);
if (socket) {
apr_socket_timeout_set(socket, saved_timeout);
}
session->have_written = 1;
if (rv != 0 && rv != NGHTTP2_ERR_WOULDBLOCK) {
if (nghttp2_is_fatal(rv)) {
dispatch_event(session, H2_SESSION_EV_PROTO_ERROR, rv, nghttp2_strerror(rv));
return APR_EGENERAL;
}
}
session->unsent_promises = 0;
session->unsent_submits = 0;
return APR_SUCCESS;
}
/**
* headers for the stream are ready.
*/
static apr_status_t on_stream_headers(h2_session *session, h2_stream *stream,
h2_headers *headers, apr_off_t len,
int eos)
{
apr_status_t status = APR_SUCCESS;
const char *s;
int rv = 0;
ap_assert(session);
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c,
H2_STRM_MSG(stream, "on_headers"));
if (headers->status < 100) {
h2_stream_rst(stream, headers->status);
goto leave;
}
else if (stream->has_response) {
h2_ngheader *nh;
status = h2_res_create_ngtrailer(&nh, stream->pool, headers);
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, session->c,
H2_STRM_LOG(APLOGNO(03072), stream, "submit %d trailers"),
(int)nh->nvlen);
if (status == APR_SUCCESS) {
rv = nghttp2_submit_trailer(session->ngh2, stream->id,
nh->nv, nh->nvlen);
}
else {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, session->c,
H2_STRM_LOG(APLOGNO(10024), stream, "invalid trailers"));
h2_stream_rst(stream, NGHTTP2_PROTOCOL_ERROR);
}
goto leave;
}
else {
nghttp2_data_provider provider, *pprovider = NULL;
h2_ngheader *ngh;
const char *note;
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_STRM_LOG(APLOGNO(03073), stream, "submit response %d, REMOTE_WINDOW_SIZE=%u"),
headers->status,
(unsigned int)nghttp2_session_get_stream_remote_window_size(session->ngh2, stream->id));
if (!eos || len > 0) {
memset(&provider, 0, sizeof(provider));
provider.source.fd = stream->id;
provider.read_callback = stream_data_cb;
pprovider = &provider;
}
/* If this stream is not a pushed one itself,
* and HTTP/2 server push is enabled here,
* and the response HTTP status is not sth >= 400,
* and the remote side has pushing enabled,
* -> find and perform any pushes on this stream
* *before* we submit the stream response itself.
* This helps clients avoid opening new streams on Link
* headers that get pushed right afterwards.
*
* *) the response code is relevant, as we do not want to
* make pushes on 401 or 403 codes and friends.
* And if we see a 304, we do not push either
* as the client, having this resource in its cache, might
* also have the pushed ones as well.
*/
if (!stream->initiated_on
&& !stream->has_response
&& stream->request && stream->request->method
&& !strcmp("GET", stream->request->method)
&& (headers->status < 400)
&& (headers->status != 304)
&& h2_session_push_enabled(session)) {
/* PUSH is possibe and enabled on server, unless the request
* denies it, submit resources to push */
s = apr_table_get(headers->notes, H2_PUSH_MODE_NOTE);
if (!s || strcmp(s, "0")) {
h2_stream_submit_pushes(stream, headers);
}
}
if (!stream->pref_priority) {
stream->pref_priority = h2_stream_get_priority(stream, headers);
}
h2_session_set_prio(session, stream, stream->pref_priority);
note = apr_table_get(headers->notes, H2_FILTER_DEBUG_NOTE);
if (note && !strcmp("on", note)) {
int32_t connFlowIn, connFlowOut;
connFlowIn = nghttp2_session_get_effective_local_window_size(session->ngh2);
connFlowOut = nghttp2_session_get_remote_window_size(session->ngh2);
headers = h2_headers_copy(stream->pool, headers);
apr_table_setn(headers->headers, "conn-flow-in",
apr_itoa(stream->pool, connFlowIn));
apr_table_setn(headers->headers, "conn-flow-out",
apr_itoa(stream->pool, connFlowOut));
}
if (headers->status == 103
&& !h2_config_sgeti(session->s, H2_CONF_EARLY_HINTS)) {
/* suppress sending this to the client, it might have triggered
* pushes and served its purpose nevertheless */
rv = 0;
goto leave;
}
status = h2_res_create_ngheader(&ngh, stream->pool, headers);
if (status == APR_SUCCESS) {
rv = nghttp2_submit_response(session->ngh2, stream->id,
ngh->nv, ngh->nvlen, pprovider);
stream->has_response = h2_headers_are_response(headers);
session->have_written = 1;
if (stream->initiated_on) {
++session->pushes_submitted;
}
else {
++session->responses_submitted;
}
}
else {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, session->c,
H2_STRM_LOG(APLOGNO(10025), stream, "invalid response"));
h2_stream_rst(stream, NGHTTP2_PROTOCOL_ERROR);
}
}
leave:
if (nghttp2_is_fatal(rv)) {
status = APR_EGENERAL;
dispatch_event(session, H2_SESSION_EV_PROTO_ERROR, rv, nghttp2_strerror(rv));
ap_log_cerror(APLOG_MARK, APLOG_ERR, status, session->c,
APLOGNO(02940) "submit_response: %s",
nghttp2_strerror(rv));
}
++session->unsent_submits;
/* Unsent push promises are written immediately, as nghttp2
* 1.5.0 realizes internal stream data structures only on
* send and we might need them for other submits.
* Also, to conserve memory, we send at least every 10 submits
* so that nghttp2 does not buffer all outbound items too
* long.
*/
if (status == APR_SUCCESS
&& (session->unsent_promises || session->unsent_submits > 10)) {
status = h2_session_send(session);
}
return status;
}
/**
* A stream was resumed as new response/output data arrived.
*/
static apr_status_t on_stream_resume(void *ctx, h2_stream *stream)
{
h2_session *session = ctx;
apr_status_t status = APR_EAGAIN;
int rv;
apr_off_t len = 0;
int eos = 0;
h2_headers *headers;
ap_assert(stream);
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c,
H2_STRM_MSG(stream, "on_resume"));
send_headers:
headers = NULL;
status = h2_stream_out_prepare(stream, &len, &eos, &headers);
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, status, session->c,
H2_STRM_MSG(stream, "prepared len=%ld, eos=%d"),
(long)len, eos);
if (headers) {
status = on_stream_headers(session, stream, headers, len, eos);
if (status != APR_SUCCESS || stream->rst_error) {
return status;
}
goto send_headers;
}
else if (status != APR_EAGAIN) {
/* we have DATA to send */
if (!stream->has_response) {
/* but no response */
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_STRM_LOG(APLOGNO(03466), stream,
"no response, RST_STREAM"));
h2_stream_rst(stream, H2_ERR_PROTOCOL_ERROR);
return APR_SUCCESS;
}
rv = nghttp2_session_resume_data(session->ngh2, stream->id);
session->have_written = 1;
ap_log_cerror(APLOG_MARK, nghttp2_is_fatal(rv)?
APLOG_ERR : APLOG_DEBUG, 0, session->c,
H2_STRM_LOG(APLOGNO(02936), stream, "resumed"));
}
return status;
}
static void h2_session_in_flush(h2_session *session)
{
int id;
while ((id = h2_iq_shift(session->in_process)) > 0) {
h2_stream *stream = get_stream(session, id);
if (stream) {
ap_assert(!stream->scheduled);
if (h2_stream_prep_processing(stream) == APR_SUCCESS) {
h2_mplx_process(session->mplx, stream, stream_pri_cmp, session);
}
else {
h2_stream_rst(stream, H2_ERR_INTERNAL_ERROR);
}
}
}
while ((id = h2_iq_shift(session->in_pending)) > 0) {
h2_stream *stream = get_stream(session, id);
if (stream) {
h2_stream_flush_input(stream);
}
}
}
static apr_status_t session_read(h2_session *session, apr_size_t readlen, int block)
{
apr_status_t status, rstatus = APR_EAGAIN;
conn_rec *c = session->c;
apr_off_t read_start = session->io.bytes_read;
while (1) {
/* H2_IN filter handles all incoming data against the session.
* We just pull at the filter chain to make it happen */
status = ap_get_brigade(c->input_filters,
session->bbtmp, AP_MODE_READBYTES,
block? APR_BLOCK_READ : APR_NONBLOCK_READ,
H2MAX(APR_BUCKET_BUFF_SIZE, readlen));
/* get rid of any possible data we do not expect to get */
apr_brigade_cleanup(session->bbtmp);
switch (status) {
case APR_SUCCESS:
/* successful read, reset our idle timers */
rstatus = APR_SUCCESS;
if (block) {
/* successful blocked read, try unblocked to
* get more. */
block = 0;
}
break;
case APR_EAGAIN:
return rstatus;
case APR_TIMEUP:
return status;
default:
if (session->io.bytes_read == read_start) {
/* first attempt failed */
if (APR_STATUS_IS_ETIMEDOUT(status)
|| APR_STATUS_IS_ECONNABORTED(status)
|| APR_STATUS_IS_ECONNRESET(status)
|| APR_STATUS_IS_EOF(status)
|| APR_STATUS_IS_EBADF(status)) {
/* common status for a client that has left */
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, status, c,
H2_SSSN_MSG(session, "input gone"));
}
else {
/* uncommon status, log on INFO so that we see this */
ap_log_cerror( APLOG_MARK, APLOG_DEBUG, status, c,
H2_SSSN_LOG(APLOGNO(02950), session,
"error reading, terminating"));
}
return status;
}
/* subsequent failure after success(es), return initial
* status. */
return rstatus;
}
if ((session->io.bytes_read - read_start) > readlen) {
/* read enough in one go, give write a chance */
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, status, c,
H2_SSSN_MSG(session, "read enough, returning"));
break;
}
}
return rstatus;
}
static apr_status_t h2_session_read(h2_session *session, int block)
{
apr_status_t status = session_read(session, session->max_stream_mem
* H2MAX(2, session->open_streams),
block);
h2_session_in_flush(session);
return status;
}
static const char *StateNames[] = {
"INIT", /* H2_SESSION_ST_INIT */
"DONE", /* H2_SESSION_ST_DONE */
"IDLE", /* H2_SESSION_ST_IDLE */
"BUSY", /* H2_SESSION_ST_BUSY */
"WAIT", /* H2_SESSION_ST_WAIT */
"CLEANUP", /* H2_SESSION_ST_CLEANUP */
};
const char *h2_session_state_str(h2_session_state state)
{
if (state >= (sizeof(StateNames)/sizeof(StateNames[0]))) {
return "unknown";
}
return StateNames[state];
}
static void update_child_status(h2_session *session, int status, const char *msg)
{
/* Assume that we also change code/msg when something really happened and
* avoid updating the scoreboard in between */
if (session->last_status_code != status
|| session->last_status_msg != msg) {
apr_snprintf(session->status, sizeof(session->status),
"%s, streams: %d/%d/%d/%d/%d (open/recv/resp/push/rst)",
msg? msg : "-",
(int)session->open_streams,
(int)session->remote.emitted_count,
(int)session->responses_submitted,
(int)session->pushes_submitted,
(int)session->pushes_reset + session->streams_reset);
ap_update_child_status_descr(session->c->sbh, status, session->status);
}
}
static void transit(h2_session *session, const char *action, h2_session_state nstate)
{
apr_time_t timeout;
int ostate, loglvl;
const char *s;
if (session->state != nstate) {
ostate = session->state;
session->state = nstate;
loglvl = APLOG_DEBUG;
if ((ostate == H2_SESSION_ST_BUSY && nstate == H2_SESSION_ST_WAIT)
|| (ostate == H2_SESSION_ST_WAIT && nstate == H2_SESSION_ST_BUSY)){
loglvl = APLOG_TRACE1;
}
ap_log_cerror(APLOG_MARK, loglvl, 0, session->c,
H2_SSSN_LOG(APLOGNO(03078), session,
"transit [%s] -- %s --> [%s]"),
h2_session_state_str(ostate), action,
h2_session_state_str(nstate));
switch (session->state) {
case H2_SESSION_ST_IDLE:
if (!session->remote.emitted_count) {
/* on fresh connections, with async mpm, do not return
* to mpm for a second. This gives the first request a better
* chance to arrive (und connection leaving IDLE state).
* If we return to mpm right away, this connection has the
* same chance of being cleaned up by the mpm as connections
* that already served requests - not fair. */
session->idle_sync_until = apr_time_now() + apr_time_from_sec(1);
s = "timeout";
timeout = session->s->timeout;
update_child_status(session, SERVER_BUSY_READ, "idle");
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, session->c,
H2_SSSN_LOG("", session, "enter idle, timeout = %d sec"),
(int)apr_time_sec(H2MAX(session->s->timeout, session->s->keep_alive_timeout)));
}
else if (session->open_streams) {
s = "timeout";
timeout = session->s->timeout;
update_child_status(session, SERVER_BUSY_READ, "idle");
}
else {
/* normal keepalive setup */
s = "keepalive";
timeout = session->s->keep_alive_timeout;
update_child_status(session, SERVER_BUSY_KEEPALIVE, "idle");
}
session->idle_until = apr_time_now() + timeout;
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, session->c,
H2_SSSN_LOG("", session, "enter idle, %s = %d sec"),
s, (int)apr_time_sec(timeout));
break;
case H2_SESSION_ST_DONE:
update_child_status(session, SERVER_CLOSING, "done");
break;
default:
/* nop */
break;
}
}
}
static void h2_session_ev_init(h2_session *session, int arg, const char *msg)
{
switch (session->state) {
case H2_SESSION_ST_INIT:
transit(session, "init", H2_SESSION_ST_BUSY);
break;
default:
/* nop */
break;
}
}
static void h2_session_ev_local_goaway(h2_session *session, int arg, const char *msg)
{
cleanup_unprocessed_streams(session);
if (!session->remote.shutdown) {
update_child_status(session, SERVER_CLOSING, "local goaway");
}
transit(session, "local goaway", H2_SESSION_ST_DONE);
}
static void h2_session_ev_remote_goaway(h2_session *session, int arg, const char *msg)
{
if (!session->remote.shutdown) {
session->remote.error = arg;
session->remote.accepting = 0;
session->remote.shutdown = 1;
cleanup_unprocessed_streams(session);
update_child_status(session, SERVER_CLOSING, "remote goaway");
transit(session, "remote goaway", H2_SESSION_ST_DONE);
}
}
static void h2_session_ev_conn_error(h2_session *session, int arg, const char *msg)
{
switch (session->state) {
case H2_SESSION_ST_INIT:
case H2_SESSION_ST_DONE:
/* just leave */
transit(session, "conn error", H2_SESSION_ST_DONE);
break;
default:
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_SSSN_LOG(APLOGNO(03401), session,
"conn error -> shutdown"));
h2_session_shutdown(session, arg, msg, 0);
break;
}
}
static void h2_session_ev_proto_error(h2_session *session, int arg, const char *msg)
{
if (!session->local.shutdown) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_SSSN_LOG(APLOGNO(03402), session,
"proto error -> shutdown"));
h2_session_shutdown(session, arg, msg, 0);
}
}
static void h2_session_ev_conn_timeout(h2_session *session, int arg, const char *msg)
{
transit(session, msg, H2_SESSION_ST_DONE);
if (!session->local.shutdown) {
h2_session_shutdown(session, arg, msg, 1);
}
}
static void h2_session_ev_no_io(h2_session *session, int arg, const char *msg)
{
switch (session->state) {
case H2_SESSION_ST_BUSY:
/* Nothing to READ, nothing to WRITE on the master connection.
* Possible causes:
* - we wait for the client to send us sth
* - we wait for started tasks to produce output
* - we have finished all streams and the client has sent GO_AWAY
*/
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c,
H2_SSSN_MSG(session, "NO_IO event, %d streams open"),
session->open_streams);
h2_conn_io_flush(&session->io);
if (session->open_streams > 0) {
if (h2_mplx_awaits_data(session->mplx)) {
/* waiting for at least one stream to produce data */
transit(session, "no io", H2_SESSION_ST_WAIT);
}
else {
/* we have streams open, and all are submitted and none
* is suspended. The only thing keeping us from WRITEing
* more must be the flow control.
* This means we only wait for WINDOW_UPDATE from the
* client and can block on READ. */
transit(session, "no io (flow wait)", H2_SESSION_ST_IDLE);
/* Make sure we have flushed all previously written output
* so that the client will react. */
if (h2_conn_io_flush(&session->io) != APR_SUCCESS) {
dispatch_event(session, H2_SESSION_EV_CONN_ERROR, 0, NULL);
return;
}
}
}
else if (session->local.accepting) {
/* When we have no streams, but accept new, switch to idle */
transit(session, "no io (keepalive)", H2_SESSION_ST_IDLE);
}
else {
/* We are no longer accepting new streams and there are
* none left. Time to leave. */
h2_session_shutdown(session, arg, msg, 0);
transit(session, "no io", H2_SESSION_ST_DONE);
}
break;
default:
/* nop */
break;
}
}
static void h2_session_ev_frame_rcvd(h2_session *session, int arg, const char *msg)
{
switch (session->state) {
case H2_SESSION_ST_IDLE:
case H2_SESSION_ST_WAIT:
transit(session, "frame received", H2_SESSION_ST_BUSY);
break;
default:
/* nop */
break;
}
}
static void h2_session_ev_stream_change(h2_session *session, int arg, const char *msg)
{
switch (session->state) {
case H2_SESSION_ST_IDLE:
case H2_SESSION_ST_WAIT:
transit(session, "stream change", H2_SESSION_ST_BUSY);
break;
default:
/* nop */
break;
}
}
static void h2_session_ev_ngh2_done(h2_session *session, int arg, const char *msg)
{
switch (session->state) {
case H2_SESSION_ST_DONE:
/* nop */
break;
default:
transit(session, "nghttp2 done", H2_SESSION_ST_DONE);
break;
}
}
static void h2_session_ev_mpm_stopping(h2_session *session, int arg, const char *msg)
{
switch (session->state) {
case H2_SESSION_ST_DONE:
/* nop */
break;
default:
h2_session_shutdown_notice(session);
break;
}
}
static void h2_session_ev_pre_close(h2_session *session, int arg, const char *msg)
{
h2_session_shutdown(session, arg, msg, 1);
}
static void ev_stream_open(h2_session *session, h2_stream *stream)
{
h2_iq_append(session->in_process, stream->id);
}
static void ev_stream_closed(h2_session *session, h2_stream *stream)
{
apr_bucket *b;
if (H2_STREAM_CLIENT_INITIATED(stream->id)
&& (stream->id > session->local.completed_max)) {
session->local.completed_max = stream->id;
}
switch (session->state) {
case H2_SESSION_ST_IDLE:
break;
default:
break;
}
/* The stream might have data in the buffers of the main connection.
* We can only free the allocated resources once all had been written.
* Send a special buckets on the connection that gets destroyed when
* all preceding data has been handled. On its destruction, it is safe
* to purge all resources of the stream. */
b = h2_bucket_eos_create(session->c->bucket_alloc, stream);
APR_BRIGADE_INSERT_TAIL(session->bbtmp, b);
h2_conn_io_pass(&session->io, session->bbtmp);
apr_brigade_cleanup(session->bbtmp);
}
static void on_stream_state_enter(void *ctx, h2_stream *stream)
{
h2_session *session = ctx;
/* stream entered a new state */
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c,
H2_STRM_MSG(stream, "entered state"));
switch (stream->state) {
case H2_SS_IDLE: /* stream was created */
++session->open_streams;
if (H2_STREAM_CLIENT_INITIATED(stream->id)) {
++session->remote.emitted_count;
if (stream->id > session->remote.emitted_max) {
session->remote.emitted_max = stream->id;
session->local.accepted_max = stream->id;
}
}
else {
if (stream->id > session->local.emitted_max) {
++session->local.emitted_count;
session->remote.emitted_max = stream->id;
}
}
break;
case H2_SS_OPEN: /* stream has request headers */
case H2_SS_RSVD_L: /* stream has request headers */
ev_stream_open(session, stream);
break;
case H2_SS_CLOSED_L: /* stream output was closed */
break;
case H2_SS_CLOSED_R: /* stream input was closed */
break;
case H2_SS_CLOSED: /* stream in+out were closed */
--session->open_streams;
ev_stream_closed(session, stream);
break;
case H2_SS_CLEANUP:
nghttp2_session_set_stream_user_data(session->ngh2, stream->id, NULL);
h2_mplx_stream_cleanup(session->mplx, stream);
break;
default:
break;
}
dispatch_event(session, H2_SESSION_EV_STREAM_CHANGE, 0, "stream state change");
}
static void on_stream_event(void *ctx, h2_stream *stream,
h2_stream_event_t ev)
{
h2_session *session = ctx;
switch (ev) {
case H2_SEV_IN_DATA_PENDING:
h2_iq_append(session->in_pending, stream->id);
break;
default:
/* NOP */
break;
}
}
static void on_stream_state_event(void *ctx, h2_stream *stream,
h2_stream_event_t ev)
{
h2_session *session = ctx;
switch (ev) {
case H2_SEV_CANCELLED:
if (session->state != H2_SESSION_ST_DONE) {
nghttp2_submit_rst_stream(session->ngh2, NGHTTP2_FLAG_NONE,
stream->id, stream->rst_error);
}
break;
default:
/* NOP */
break;
}
}
static void dispatch_event(h2_session *session, h2_session_event_t ev,
int arg, const char *msg)
{
switch (ev) {
case H2_SESSION_EV_INIT:
h2_session_ev_init(session, arg, msg);
break;
case H2_SESSION_EV_LOCAL_GOAWAY:
h2_session_ev_local_goaway(session, arg, msg);
break;
case H2_SESSION_EV_REMOTE_GOAWAY:
h2_session_ev_remote_goaway(session, arg, msg);
break;
case H2_SESSION_EV_CONN_ERROR:
h2_session_ev_conn_error(session, arg, msg);
break;
case H2_SESSION_EV_PROTO_ERROR:
h2_session_ev_proto_error(session, arg, msg);
break;
case H2_SESSION_EV_CONN_TIMEOUT:
h2_session_ev_conn_timeout(session, arg, msg);
break;
case H2_SESSION_EV_NO_IO:
h2_session_ev_no_io(session, arg, msg);
break;
case H2_SESSION_EV_FRAME_RCVD:
h2_session_ev_frame_rcvd(session, arg, msg);
break;
case H2_SESSION_EV_NGH2_DONE:
h2_session_ev_ngh2_done(session, arg, msg);
break;
case H2_SESSION_EV_MPM_STOPPING:
h2_session_ev_mpm_stopping(session, arg, msg);
break;
case H2_SESSION_EV_PRE_CLOSE:
h2_session_ev_pre_close(session, arg, msg);
break;
case H2_SESSION_EV_STREAM_CHANGE:
h2_session_ev_stream_change(session, arg, msg);
break;
default:
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, session->c,
H2_SSSN_MSG(session, "unknown event %d"), ev);
break;
}
}
/* trigger window updates, stream resumes and submits */
static apr_status_t dispatch_master(h2_session *session) {
apr_status_t status;
status = h2_mplx_dispatch_master_events(session->mplx,
on_stream_resume, session);
if (status == APR_EAGAIN) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE3, status, session->c,
H2_SSSN_MSG(session, "no master event available"));
}
else if (status != APR_SUCCESS) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE3, status, session->c,
H2_SSSN_MSG(session, "dispatch error"));
dispatch_event(session, H2_SESSION_EV_CONN_ERROR,
H2_ERR_INTERNAL_ERROR, "dispatch error");
}
return status;
}
static const int MAX_WAIT_MICROS = 200 * 1000;
apr_status_t h2_session_process(h2_session *session, int async)
{
apr_status_t status = APR_SUCCESS;
conn_rec *c = session->c;
int rv, mpm_state, trace = APLOGctrace3(c);
apr_time_t now;
if (trace) {
ap_log_cerror( APLOG_MARK, APLOG_TRACE3, status, c,
H2_SSSN_MSG(session, "process start, async=%d"), async);
}
while (session->state != H2_SESSION_ST_DONE) {
now = apr_time_now();
session->have_read = session->have_written = 0;
if (session->local.accepting
&& !ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state)) {
if (mpm_state == AP_MPMQ_STOPPING) {
dispatch_event(session, H2_SESSION_EV_MPM_STOPPING, 0, NULL);
}
}
session->status[0] = '\0';
switch (session->state) {
case H2_SESSION_ST_INIT:
ap_update_child_status_from_conn(c->sbh, SERVER_BUSY_READ, c);
if (!h2_is_acceptable_connection(c, session->r, 1)) {
update_child_status(session, SERVER_BUSY_READ,
"inadequate security");
h2_session_shutdown(session,
NGHTTP2_INADEQUATE_SECURITY, NULL, 1);
}
else {
update_child_status(session, SERVER_BUSY_READ, "init");
status = h2_session_start(session, &rv);
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, c,
H2_SSSN_LOG(APLOGNO(03079), session,
"started on %s:%d"),
session->s->server_hostname,
c->local_addr->port);
if (status != APR_SUCCESS) {
dispatch_event(session,
H2_SESSION_EV_CONN_ERROR, 0, NULL);
}
dispatch_event(session, H2_SESSION_EV_INIT, 0, NULL);
}
break;
case H2_SESSION_ST_IDLE:
if (session->idle_until && (apr_time_now() + session->idle_delay) > session->idle_until) {
ap_log_cerror( APLOG_MARK, APLOG_TRACE1, status, c,
H2_SSSN_MSG(session, "idle, timeout reached, closing"));
if (session->idle_delay) {
apr_table_setn(session->c->notes, "short-lingering-close", "1");
}
dispatch_event(session, H2_SESSION_EV_CONN_TIMEOUT, 0, "timeout");
goto out;
}
if (session->idle_delay) {
/* we are less interested in spending time on this connection */
ap_log_cerror( APLOG_MARK, APLOG_TRACE2, status, c,
H2_SSSN_MSG(session, "session is idle (%ld ms), idle wait %ld sec left"),
(long)apr_time_as_msec(session->idle_delay),
(long)apr_time_sec(session->idle_until - now));
apr_sleep(session->idle_delay);
session->idle_delay = 0;
}
h2_conn_io_flush(&session->io);
if (async && !session->r && (now > session->idle_sync_until)) {
if (trace) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE3, status, c,
H2_SSSN_MSG(session,
"nonblock read, %d streams open"),
session->open_streams);
}
status = h2_session_read(session, 0);
if (status == APR_SUCCESS) {
session->have_read = 1;
}
else if (APR_STATUS_IS_EAGAIN(status) || APR_STATUS_IS_TIMEUP(status)) {
status = APR_EAGAIN;
goto out;
}
else {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, c,
H2_SSSN_LOG(APLOGNO(03403), session,
"no data, error"));
dispatch_event(session,
H2_SESSION_EV_CONN_ERROR, 0, "timeout");
}
}
else {
/* make certain, we send everything before we idle */
if (trace) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE3, status, c,
H2_SSSN_MSG(session,
"sync, stutter 1-sec, %d streams open"),
session->open_streams);
}
/* We wait in smaller increments, using a 1 second timeout.
* That gives us the chance to check for MPMQ_STOPPING often.
*/
status = h2_mplx_idle(session->mplx);
if (status == APR_EAGAIN) {
break;
}
else if (status != APR_SUCCESS) {
dispatch_event(session, H2_SESSION_EV_CONN_ERROR,
H2_ERR_ENHANCE_YOUR_CALM, "less is more");
}
h2_filter_cin_timeout_set(session->cin, apr_time_from_sec(1));
status = h2_session_read(session, 1);
if (status == APR_SUCCESS) {
session->have_read = 1;
}
else if (status == APR_EAGAIN) {
/* nothing to read */
}
else if (APR_STATUS_IS_TIMEUP(status)) {
/* continue reading handling */
}
else if (APR_STATUS_IS_ECONNABORTED(status)
|| APR_STATUS_IS_ECONNRESET(status)
|| APR_STATUS_IS_EOF(status)
|| APR_STATUS_IS_EBADF(status)) {
ap_log_cerror( APLOG_MARK, APLOG_TRACE3, status, c,
H2_SSSN_MSG(session, "input gone"));
dispatch_event(session, H2_SESSION_EV_CONN_ERROR, 0, NULL);
}
else {
ap_log_cerror( APLOG_MARK, APLOG_TRACE3, status, c,
H2_SSSN_MSG(session,
"(1 sec timeout) read failed"));
dispatch_event(session, H2_SESSION_EV_CONN_ERROR, 0, "error");
}
}
if (nghttp2_session_want_write(session->ngh2)) {
ap_update_child_status(session->c->sbh, SERVER_BUSY_WRITE, NULL);
status = h2_session_send(session);
if (status == APR_SUCCESS) {
status = h2_conn_io_flush(&session->io);
}
if (status != APR_SUCCESS) {
dispatch_event(session, H2_SESSION_EV_CONN_ERROR,
H2_ERR_INTERNAL_ERROR, "writing");
break;
}
}
break;
case H2_SESSION_ST_BUSY:
if (nghttp2_session_want_read(session->ngh2)) {
ap_update_child_status(session->c->sbh, SERVER_BUSY_READ, NULL);
h2_filter_cin_timeout_set(session->cin, session->s->timeout);
status = h2_session_read(session, 0);
if (status == APR_SUCCESS) {
session->have_read = 1;
}
else if (status == APR_EAGAIN) {
/* nothing to read */
}
else if (APR_STATUS_IS_TIMEUP(status)) {
dispatch_event(session, H2_SESSION_EV_CONN_TIMEOUT, 0, NULL);
break;
}
else {
dispatch_event(session, H2_SESSION_EV_CONN_ERROR, 0, NULL);
}
}
status = dispatch_master(session);
if (status != APR_SUCCESS && status != APR_EAGAIN) {
break;
}
if (nghttp2_session_want_write(session->ngh2)) {
ap_update_child_status(session->c->sbh, SERVER_BUSY_WRITE, NULL);
status = h2_session_send(session);
if (status == APR_SUCCESS) {
status = h2_conn_io_flush(&session->io);
}
if (status != APR_SUCCESS) {
dispatch_event(session, H2_SESSION_EV_CONN_ERROR,
H2_ERR_INTERNAL_ERROR, "writing");
break;
}
}
if (session->have_read || session->have_written) {
if (session->wait_us) {
session->wait_us = 0;
}
}
else if (!nghttp2_session_want_write(session->ngh2)) {
dispatch_event(session, H2_SESSION_EV_NO_IO, 0, NULL);
}
break;
case H2_SESSION_ST_WAIT:
if (session->wait_us <= 0) {
session->wait_us = 10;
if (h2_conn_io_flush(&session->io) != APR_SUCCESS) {
dispatch_event(session, H2_SESSION_EV_CONN_ERROR, 0, NULL);
break;
}
}
else {
/* repeating, increase timer for graceful backoff */
session->wait_us = H2MIN(session->wait_us*2, MAX_WAIT_MICROS);
}
if (trace) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, c,
"h2_session: wait for data, %ld micros",
(long)session->wait_us);
}
status = h2_mplx_out_trywait(session->mplx, session->wait_us,
session->iowait);
if (status == APR_SUCCESS) {
session->wait_us = 0;
dispatch_event(session, H2_SESSION_EV_STREAM_CHANGE, 0, NULL);
}
else if (APR_STATUS_IS_TIMEUP(status)) {
/* go back to checking all inputs again */
transit(session, "wait cycle", session->local.shutdown?
H2_SESSION_ST_DONE : H2_SESSION_ST_BUSY);
}
else if (APR_STATUS_IS_ECONNRESET(status)
|| APR_STATUS_IS_ECONNABORTED(status)) {
dispatch_event(session, H2_SESSION_EV_CONN_ERROR, 0, NULL);
}
else {
ap_log_cerror(APLOG_MARK, APLOG_WARNING, status, c,
H2_SSSN_LOG(APLOGNO(03404), session,
"waiting on conditional"));
h2_session_shutdown(session, H2_ERR_INTERNAL_ERROR,
"cond wait error", 0);
}
break;
default:
ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EGENERAL, c,
H2_SSSN_LOG(APLOGNO(03080), session,
"unknown state"));
dispatch_event(session, H2_SESSION_EV_PROTO_ERROR, 0, NULL);
break;
}
if (!nghttp2_session_want_read(session->ngh2)
&& !nghttp2_session_want_write(session->ngh2)) {
dispatch_event(session, H2_SESSION_EV_NGH2_DONE, 0, NULL);
}
if (session->reprioritize) {
h2_mplx_reprioritize(session->mplx, stream_pri_cmp, session);
session->reprioritize = 0;
}
}
out:
if (trace) {
ap_log_cerror( APLOG_MARK, APLOG_TRACE3, status, c,
H2_SSSN_MSG(session, "process returns"));
}
if ((session->state != H2_SESSION_ST_DONE)
&& (APR_STATUS_IS_EOF(status)
|| APR_STATUS_IS_ECONNRESET(status)
|| APR_STATUS_IS_ECONNABORTED(status))) {
dispatch_event(session, H2_SESSION_EV_CONN_ERROR, 0, NULL);
}
return (session->state == H2_SESSION_ST_DONE)? APR_EOF : APR_SUCCESS;
}
apr_status_t h2_session_pre_close(h2_session *session, int async)
{
apr_status_t status;
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, session->c,
H2_SSSN_MSG(session, "pre_close"));
dispatch_event(session, H2_SESSION_EV_PRE_CLOSE, 0,
(session->state == H2_SESSION_ST_IDLE)? "timeout" : NULL);
status = session_cleanup(session, "pre_close");
if (status == APR_SUCCESS) {
/* no one should hold a reference to this session any longer and
* the h2_ctx was removed from the connection.
* Take the pool (and thus all subpools etc. down now, instead of
* during cleanup of main connection pool. */
apr_pool_destroy(session->pool);
}
return status;
}