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apache / httpd / 71472a0bcecbfa206561d4e3f6bb5e3c15e1ca62 / . / modules / http2 / h2_stream.c
blob: 0b2fdb1f6ab705de5858bd9e7fe78374255c6625 [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_strings.h>
#include <httpd.h>
#include <http_core.h>
#include <http_connection.h>
#include <http_log.h>
#include <nghttp2/nghttp2.h>
#include "h2_private.h"
#include "h2.h"
#include "h2_bucket_beam.h"
#include "h2_conn.h"
#include "h2_config.h"
#include "h2_h2.h"
#include "h2_mplx.h"
#include "h2_push.h"
#include "h2_request.h"
#include "h2_headers.h"
#include "h2_session.h"
#include "h2_stream.h"
#include "h2_task.h"
#include "h2_ctx.h"
#include "h2_task.h"
#include "h2_util.h"
static const char *h2_ss_str(h2_stream_state_t state)
{
switch (state) {
case H2_SS_IDLE:
return "IDLE";
case H2_SS_RSVD_L:
return "RESERVED_LOCAL";
case H2_SS_RSVD_R:
return "RESERVED_REMOTE";
case H2_SS_OPEN:
return "OPEN";
case H2_SS_CLOSED_L:
return "HALF_CLOSED_LOCAL";
case H2_SS_CLOSED_R:
return "HALF_CLOSED_REMOTE";
case H2_SS_CLOSED:
return "CLOSED";
case H2_SS_CLEANUP:
return "CLEANUP";
default:
return "UNKNOWN";
}
}
const char *h2_stream_state_str(h2_stream *stream)
{
return h2_ss_str(stream->state);
}
/* Abbreviations for stream transit tables */
#define S_XXX (-2) /* Programming Error */
#define S_ERR (-1) /* Protocol Error */
#define S_NOP (0) /* No Change */
#define S_IDL (H2_SS_IDL + 1)
#define S_RS_L (H2_SS_RSVD_L + 1)
#define S_RS_R (H2_SS_RSVD_R + 1)
#define S_OPEN (H2_SS_OPEN + 1)
#define S_CL_L (H2_SS_CLOSED_L + 1)
#define S_CL_R (H2_SS_CLOSED_R + 1)
#define S_CLS (H2_SS_CLOSED + 1)
#define S_CLN (H2_SS_CLEANUP + 1)
/* state transisitions when certain frame types are sent */
static int trans_on_send[][H2_SS_MAX] = {
/*S_IDLE,S_RS_R, S_RS_L, S_OPEN, S_CL_R, S_CL_L, S_CLS, S_CLN, */
{ S_ERR, S_ERR, S_ERR, S_NOP, S_NOP, S_ERR, S_NOP, S_NOP, },/* DATA */
{ S_ERR, S_ERR, S_CL_R, S_NOP, S_NOP, S_ERR, S_NOP, S_NOP, },/* HEADERS */
{ S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, },/* PRIORITY */
{ S_CLS, S_CLS, S_CLS, S_CLS, S_CLS, S_CLS, S_NOP, S_NOP, },/* RST_STREAM */
{ S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, },/* SETTINGS */
{ S_RS_L,S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, },/* PUSH_PROMISE */
{ S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, },/* PING */
{ S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, },/* GOAWAY */
{ S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, },/* WINDOW_UPDATE */
{ S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, },/* CONT */
};
/* state transisitions when certain frame types are received */
static int trans_on_recv[][H2_SS_MAX] = {
/*S_IDLE,S_RS_R, S_RS_L, S_OPEN, S_CL_R, S_CL_L, S_CLS, S_CLN, */
{ S_ERR, S_ERR, S_ERR, S_NOP, S_ERR, S_NOP, S_NOP, S_NOP, },/* DATA */
{ S_OPEN,S_CL_L, S_ERR, S_NOP, S_ERR, S_NOP, S_NOP, S_NOP, },/* HEADERS */
{ S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, },/* PRIORITY */
{ S_ERR, S_CLS, S_CLS, S_CLS, S_CLS, S_CLS, S_NOP, S_NOP, },/* RST_STREAM */
{ S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, },/* SETTINGS */
{ S_RS_R,S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, },/* PUSH_PROMISE */
{ S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, },/* PING */
{ S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, S_ERR, },/* GOAWAY */
{ S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, },/* WINDOW_UPDATE */
{ S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, S_NOP, },/* CONT */
};
/* state transisitions when certain events happen */
static int trans_on_event[][H2_SS_MAX] = {
/*S_IDLE,S_RS_R, S_RS_L, S_OPEN, S_CL_R, S_CL_L, S_CLS, S_CLN, */
{ S_XXX, S_ERR, S_ERR, S_CL_L, S_CLS, S_XXX, S_XXX, S_XXX, },/* EV_CLOSED_L*/
{ S_ERR, S_ERR, S_ERR, S_CL_R, S_ERR, S_CLS, S_NOP, S_NOP, },/* EV_CLOSED_R*/
{ S_CLS, S_CLS, S_CLS, S_CLS, S_CLS, S_CLS, S_NOP, S_NOP, },/* EV_CANCELLED*/
{ S_NOP, S_XXX, S_XXX, S_XXX, S_XXX, S_CLS, S_CLN, S_XXX, },/* EV_EOS_SENT*/
};
static int on_map(h2_stream_state_t state, int map[H2_SS_MAX])
{
int op = map[state];
switch (op) {
case S_XXX:
case S_ERR:
return op;
case S_NOP:
return state;
default:
return op-1;
}
}
static int on_frame(h2_stream_state_t state, int frame_type,
int frame_map[][H2_SS_MAX], apr_size_t maxlen)
{
ap_assert(frame_type >= 0);
ap_assert(state >= 0);
if (frame_type >= maxlen) {
return state; /* NOP, ignore unknown frame types */
}
return on_map(state, frame_map[frame_type]);
}
static int on_frame_send(h2_stream_state_t state, int frame_type)
{
return on_frame(state, frame_type, trans_on_send, H2_ALEN(trans_on_send));
}
static int on_frame_recv(h2_stream_state_t state, int frame_type)
{
return on_frame(state, frame_type, trans_on_recv, H2_ALEN(trans_on_recv));
}
static int on_event(h2_stream* stream, h2_stream_event_t ev)
{
if (stream->monitor && stream->monitor->on_event) {
stream->monitor->on_event(stream->monitor->ctx, stream, ev);
}
if (ev < H2_ALEN(trans_on_event)) {
return on_map(stream->state, trans_on_event[ev]);
}
return stream->state;
}
static void H2_STREAM_OUT_LOG(int lvl, h2_stream *s, const char *tag)
{
if (APLOG_C_IS_LEVEL(s->session->c, lvl)) {
conn_rec *c = s->session->c;
char buffer[4 * 1024];
apr_size_t len, bmax = sizeof(buffer)/sizeof(buffer[0]);
len = h2_util_bb_print(buffer, bmax, tag, "", s->out_buffer);
ap_log_cerror(APLOG_MARK, lvl, 0, c,
H2_STRM_MSG(s, "out-buffer(%s)"), len? buffer : "empty");
}
}
static apr_status_t setup_input(h2_stream *stream) {
if (stream->input == NULL) {
int empty = (stream->input_eof
&& (!stream->in_buffer
|| APR_BRIGADE_EMPTY(stream->in_buffer)));
if (!empty) {
h2_beam_create(&stream->input, stream->pool, stream->id,
"input", H2_BEAM_OWNER_SEND, 0,
stream->session->s->timeout);
h2_beam_send_from(stream->input, stream->pool);
}
}
return APR_SUCCESS;
}
static apr_status_t close_input(h2_stream *stream)
{
conn_rec *c = stream->session->c;
apr_status_t status = APR_SUCCESS;
stream->input_eof = 1;
if (stream->input && h2_beam_is_closed(stream->input)) {
return APR_SUCCESS;
}
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, stream->session->c,
H2_STRM_MSG(stream, "closing input"));
if (stream->rst_error) {
return APR_ECONNRESET;
}
if (stream->trailers && !apr_is_empty_table(stream->trailers)) {
apr_bucket *b;
h2_headers *r;
if (!stream->in_buffer) {
stream->in_buffer = apr_brigade_create(stream->pool, c->bucket_alloc);
}
r = h2_headers_create(HTTP_OK, stream->trailers, NULL,
stream->in_trailer_octets, stream->pool);
stream->trailers = NULL;
b = h2_bucket_headers_create(c->bucket_alloc, r);
APR_BRIGADE_INSERT_TAIL(stream->in_buffer, b);
b = apr_bucket_eos_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(stream->in_buffer, b);
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, stream->session->c,
H2_STRM_MSG(stream, "added trailers"));
h2_stream_dispatch(stream, H2_SEV_IN_DATA_PENDING);
}
if (stream->input) {
h2_stream_flush_input(stream);
return h2_beam_close(stream->input);
}
return status;
}
static apr_status_t close_output(h2_stream *stream)
{
if (!stream->output || h2_beam_is_closed(stream->output)) {
return APR_SUCCESS;
}
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, stream->session->c,
H2_STRM_MSG(stream, "closing output"));
return h2_beam_leave(stream->output);
}
static void on_state_enter(h2_stream *stream)
{
if (stream->monitor && stream->monitor->on_state_enter) {
stream->monitor->on_state_enter(stream->monitor->ctx, stream);
}
}
static void on_state_event(h2_stream *stream, h2_stream_event_t ev)
{
if (stream->monitor && stream->monitor->on_state_event) {
stream->monitor->on_state_event(stream->monitor->ctx, stream, ev);
}
}
static void on_state_invalid(h2_stream *stream)
{
if (stream->monitor && stream->monitor->on_state_invalid) {
stream->monitor->on_state_invalid(stream->monitor->ctx, stream);
}
/* stream got an event/frame invalid in its state */
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, stream->session->c,
H2_STRM_MSG(stream, "invalid state event"));
switch (stream->state) {
case H2_SS_OPEN:
case H2_SS_RSVD_L:
case H2_SS_RSVD_R:
case H2_SS_CLOSED_L:
case H2_SS_CLOSED_R:
h2_stream_rst(stream, H2_ERR_INTERNAL_ERROR);
break;
default:
break;
}
}
static apr_status_t transit(h2_stream *stream, int new_state)
{
if (new_state == stream->state) {
return APR_SUCCESS;
}
else if (new_state < 0) {
ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, stream->session->c,
H2_STRM_LOG(APLOGNO(03081), stream, "invalid transition"));
on_state_invalid(stream);
return APR_EINVAL;
}
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, stream->session->c,
H2_STRM_MSG(stream, "transit to [%s]"), h2_ss_str(new_state));
stream->state = new_state;
switch (new_state) {
case H2_SS_IDLE:
break;
case H2_SS_RSVD_L:
close_input(stream);
break;
case H2_SS_RSVD_R:
break;
case H2_SS_OPEN:
break;
case H2_SS_CLOSED_L:
close_output(stream);
break;
case H2_SS_CLOSED_R:
close_input(stream);
break;
case H2_SS_CLOSED:
close_input(stream);
close_output(stream);
if (stream->out_buffer) {
apr_brigade_cleanup(stream->out_buffer);
}
break;
case H2_SS_CLEANUP:
break;
}
on_state_enter(stream);
return APR_SUCCESS;
}
void h2_stream_set_monitor(h2_stream *stream, h2_stream_monitor *monitor)
{
stream->monitor = monitor;
}
void h2_stream_dispatch(h2_stream *stream, h2_stream_event_t ev)
{
int new_state;
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, stream->session->c,
H2_STRM_MSG(stream, "dispatch event %d"), ev);
new_state = on_event(stream, ev);
if (new_state < 0) {
ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, stream->session->c,
H2_STRM_LOG(APLOGNO(10002), stream, "invalid event %d"), ev);
on_state_invalid(stream);
AP_DEBUG_ASSERT(new_state > S_XXX);
return;
}
else if (new_state == stream->state) {
/* nop */
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, stream->session->c,
H2_STRM_MSG(stream, "non-state event %d"), ev);
return;
}
else {
on_state_event(stream, ev);
transit(stream, new_state);
}
}
static void set_policy_for(h2_stream *stream, h2_request *r)
{
int enabled = h2_session_push_enabled(stream->session);
stream->push_policy = h2_push_policy_determine(r->headers, stream->pool, enabled);
r->serialize = h2_config_sgeti(stream->session->s, H2_CONF_SER_HEADERS);
}
apr_status_t h2_stream_send_frame(h2_stream *stream, int ftype, int flags, size_t frame_len)
{
apr_status_t status = APR_SUCCESS;
int new_state, eos = 0;
new_state = on_frame_send(stream->state, ftype);
if (new_state < 0) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, stream->session->c,
H2_STRM_MSG(stream, "invalid frame %d send"), ftype);
AP_DEBUG_ASSERT(new_state > S_XXX);
return transit(stream, new_state);
}
++stream->out_frames;
stream->out_frame_octets += frame_len;
switch (ftype) {
case NGHTTP2_DATA:
eos = (flags & NGHTTP2_FLAG_END_STREAM);
break;
case NGHTTP2_HEADERS:
eos = (flags & NGHTTP2_FLAG_END_STREAM);
break;
case NGHTTP2_PUSH_PROMISE:
/* start pushed stream */
ap_assert(stream->request == NULL);
ap_assert(stream->rtmp != NULL);
status = h2_request_end_headers(stream->rtmp, stream->pool, 1, 0);
if (status != APR_SUCCESS) {
return status;
}
set_policy_for(stream, stream->rtmp);
stream->request = stream->rtmp;
stream->rtmp = NULL;
break;
default:
break;
}
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, stream->session->c,
H2_STRM_MSG(stream, "send frame %d, eos=%d"), ftype, eos);
status = transit(stream, new_state);
if (status == APR_SUCCESS && eos) {
status = transit(stream, on_event(stream, H2_SEV_CLOSED_L));
}
return status;
}
apr_status_t h2_stream_recv_frame(h2_stream *stream, int ftype, int flags, size_t frame_len)
{
apr_status_t status = APR_SUCCESS;
int new_state, eos = 0;
new_state = on_frame_recv(stream->state, ftype);
if (new_state < 0) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, stream->session->c,
H2_STRM_MSG(stream, "invalid frame %d recv"), ftype);
AP_DEBUG_ASSERT(new_state > S_XXX);
return transit(stream, new_state);
}
switch (ftype) {
case NGHTTP2_DATA:
eos = (flags & NGHTTP2_FLAG_END_STREAM);
break;
case NGHTTP2_HEADERS:
eos = (flags & NGHTTP2_FLAG_END_STREAM);
if (stream->state == H2_SS_OPEN) {
/* trailer HEADER */
if (!eos) {
h2_stream_rst(stream, H2_ERR_PROTOCOL_ERROR);
}
stream->in_trailer_octets += frame_len;
}
else {
/* request HEADER */
ap_assert(stream->request == NULL);
if (stream->rtmp == NULL) {
/* This can only happen, if the stream has received no header
* name/value pairs at all. The lastest nghttp2 version have become
* pretty good at detecting this early. In any case, we have
* to abort the connection here, since this is clearly a protocol error */
return APR_EINVAL;
}
status = h2_request_end_headers(stream->rtmp, stream->pool, eos, frame_len);
if (status != APR_SUCCESS) {
return status;
}
set_policy_for(stream, stream->rtmp);
stream->request = stream->rtmp;
stream->rtmp = NULL;
}
break;
default:
break;
}
status = transit(stream, new_state);
if (status == APR_SUCCESS && eos) {
status = transit(stream, on_event(stream, H2_SEV_CLOSED_R));
}
return status;
}
apr_status_t h2_stream_flush_input(h2_stream *stream)
{
apr_status_t status = APR_SUCCESS;
if (stream->in_buffer && !APR_BRIGADE_EMPTY(stream->in_buffer)) {
setup_input(stream);
status = h2_beam_send(stream->input, stream->in_buffer, APR_BLOCK_READ);
stream->in_last_write = apr_time_now();
}
if (stream->input_eof
&& stream->input && !h2_beam_is_closed(stream->input)) {
status = h2_beam_close(stream->input);
}
return status;
}
apr_status_t h2_stream_recv_DATA(h2_stream *stream, uint8_t flags,
const uint8_t *data, size_t len)
{
h2_session *session = stream->session;
apr_status_t status = APR_SUCCESS;
stream->in_data_frames++;
if (len > 0) {
if (APLOGctrace3(session->c)) {
const char *load = apr_pstrndup(stream->pool, (const char *)data, len);
ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, session->c,
H2_STRM_MSG(stream, "recv DATA, len=%d: -->%s<--"),
(int)len, load);
}
else {
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, status, session->c,
H2_STRM_MSG(stream, "recv DATA, len=%d"), (int)len);
}
stream->in_data_octets += len;
if (!stream->in_buffer) {
stream->in_buffer = apr_brigade_create(stream->pool,
session->c->bucket_alloc);
}
apr_brigade_write(stream->in_buffer, NULL, NULL, (const char *)data, len);
h2_stream_dispatch(stream, H2_SEV_IN_DATA_PENDING);
}
return status;
}
static void prep_output(h2_stream *stream) {
conn_rec *c = stream->session->c;
if (!stream->out_buffer) {
stream->out_buffer = apr_brigade_create(stream->pool, c->bucket_alloc);
}
}
h2_stream *h2_stream_create(int id, apr_pool_t *pool, h2_session *session,
h2_stream_monitor *monitor, int initiated_on)
{
h2_stream *stream = apr_pcalloc(pool, sizeof(h2_stream));
stream->id = id;
stream->initiated_on = initiated_on;
stream->created = apr_time_now();
stream->state = H2_SS_IDLE;
stream->pool = pool;
stream->session = session;
stream->monitor = monitor;
stream->max_mem = session->max_stream_mem;
#ifdef H2_NG2_LOCAL_WIN_SIZE
stream->in_window_size =
nghttp2_session_get_stream_local_window_size(
stream->session->ngh2, stream->id);
#endif
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c,
H2_STRM_LOG(APLOGNO(03082), stream, "created"));
on_state_enter(stream);
return stream;
}
void h2_stream_cleanup(h2_stream *stream)
{
apr_status_t status;
ap_assert(stream);
if (stream->out_buffer) {
/* remove any left over output buckets that may still have
* references into request pools */
apr_brigade_cleanup(stream->out_buffer);
}
if (stream->input) {
h2_beam_abort(stream->input);
status = h2_beam_wait_empty(stream->input, APR_NONBLOCK_READ);
if (status == APR_EAGAIN) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, stream->session->c,
H2_STRM_MSG(stream, "wait on input drain"));
status = h2_beam_wait_empty(stream->input, APR_BLOCK_READ);
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, status, stream->session->c,
H2_STRM_MSG(stream, "input drain returned"));
}
}
}
void h2_stream_destroy(h2_stream *stream)
{
ap_assert(stream);
ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, stream->session->c,
H2_STRM_MSG(stream, "destroy"));
apr_pool_destroy(stream->pool);
}
apr_status_t h2_stream_prep_processing(h2_stream *stream)
{
if (stream->request) {
const h2_request *r = stream->request;
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, stream->session->c,
H2_STRM_MSG(stream, "schedule %s %s://%s%s chunked=%d"),
r->method, r->scheme, r->authority, r->path, r->chunked);
setup_input(stream);
stream->scheduled = 1;
return APR_SUCCESS;
}
return APR_EINVAL;
}
void h2_stream_rst(h2_stream *stream, int error_code)
{
stream->rst_error = error_code;
if (stream->input) {
h2_beam_abort(stream->input);
}
if (stream->output) {
h2_beam_leave(stream->output);
}
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, stream->session->c,
H2_STRM_MSG(stream, "reset, error=%d"), error_code);
h2_stream_dispatch(stream, H2_SEV_CANCELLED);
}
apr_status_t h2_stream_set_request_rec(h2_stream *stream,
request_rec *r, int eos)
{
h2_request *req;
apr_status_t status;
ap_assert(stream->request == NULL);
ap_assert(stream->rtmp == NULL);
if (stream->rst_error) {
return APR_ECONNRESET;
}
status = h2_request_rcreate(&req, stream->pool, r);
if (status == APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, status, r,
H2_STRM_LOG(APLOGNO(03058), stream,
"set_request_rec %s host=%s://%s%s"),
req->method, req->scheme, req->authority, req->path);
stream->rtmp = req;
/* simulate the frames that led to this */
return h2_stream_recv_frame(stream, NGHTTP2_HEADERS,
NGHTTP2_FLAG_END_STREAM, 0);
}
return status;
}
void h2_stream_set_request(h2_stream *stream, const h2_request *r)
{
ap_assert(stream->request == NULL);
ap_assert(stream->rtmp == NULL);
stream->rtmp = h2_request_clone(stream->pool, r);
}
static void set_error_response(h2_stream *stream, int http_status)
{
if (!h2_stream_is_ready(stream)) {
conn_rec *c = stream->session->c;
apr_bucket *b;
h2_headers *response;
response = h2_headers_die(http_status, stream->request, stream->pool);
prep_output(stream);
b = apr_bucket_eos_create(c->bucket_alloc);
APR_BRIGADE_INSERT_HEAD(stream->out_buffer, b);
b = h2_bucket_headers_create(c->bucket_alloc, response);
APR_BRIGADE_INSERT_HEAD(stream->out_buffer, b);
}
}
static apr_status_t add_trailer(h2_stream *stream,
const char *name, size_t nlen,
const char *value, size_t vlen)
{
conn_rec *c = stream->session->c;
char *hname, *hvalue;
if (nlen == 0 || name[0] == ':') {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_EINVAL, c,
H2_STRM_LOG(APLOGNO(03060), stream,
"pseudo header in trailer"));
return APR_EINVAL;
}
if (h2_req_ignore_trailer(name, nlen)) {
return APR_SUCCESS;
}
if (!stream->trailers) {
stream->trailers = apr_table_make(stream->pool, 5);
}
hname = apr_pstrndup(stream->pool, name, nlen);
hvalue = apr_pstrndup(stream->pool, value, vlen);
h2_util_camel_case_header(hname, nlen);
apr_table_mergen(stream->trailers, hname, hvalue);
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c,
H2_STRM_MSG(stream, "added trailer '%s: %s'"), hname, hvalue);
return APR_SUCCESS;
}
apr_status_t h2_stream_add_header(h2_stream *stream,
const char *name, size_t nlen,
const char *value, size_t vlen)
{
h2_session *session = stream->session;
int error = 0;
apr_status_t status;
if (stream->has_response) {
return APR_EINVAL;
}
++stream->request_headers_added;
if (name[0] == ':') {
if ((vlen) > session->s->limit_req_line) {
/* pseudo header: approximation of request line size check */
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, session->c,
H2_STRM_MSG(stream, "pseudo %s too long"), name);
error = HTTP_REQUEST_URI_TOO_LARGE;
}
}
else if ((nlen + 2 + vlen) > session->s->limit_req_fieldsize) {
/* header too long */
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, session->c,
H2_STRM_MSG(stream, "header %s too long"), name);
error = HTTP_REQUEST_HEADER_FIELDS_TOO_LARGE;
}
if (stream->request_headers_added > session->s->limit_req_fields + 4) {
/* too many header lines, include 4 pseudo headers */
if (stream->request_headers_added
> session->s->limit_req_fields + 4 + 100) {
/* yeah, right */
h2_stream_rst(stream, H2_ERR_ENHANCE_YOUR_CALM);
return APR_ECONNRESET;
}
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, session->c,
H2_STRM_MSG(stream, "too many header lines"));
error = HTTP_REQUEST_HEADER_FIELDS_TOO_LARGE;
}
if (error) {
set_error_response(stream, error);
return APR_EINVAL;
}
else if (H2_SS_IDLE == stream->state) {
if (!stream->rtmp) {
stream->rtmp = h2_req_create(stream->id, stream->pool,
NULL, NULL, NULL, NULL, NULL, 0);
}
status = h2_request_add_header(stream->rtmp, stream->pool,
name, nlen, value, vlen);
}
else if (H2_SS_OPEN == stream->state) {
status = add_trailer(stream, name, nlen, value, vlen);
}
else {
status = APR_EINVAL;
}
if (status != APR_SUCCESS) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, session->c,
H2_STRM_MSG(stream, "header %s not accepted"), name);
h2_stream_dispatch(stream, H2_SEV_CANCELLED);
}
return status;
}
static apr_bucket *get_first_headers_bucket(apr_bucket_brigade *bb)
{
if (bb) {
apr_bucket *b = APR_BRIGADE_FIRST(bb);
while (b != APR_BRIGADE_SENTINEL(bb)) {
if (H2_BUCKET_IS_HEADERS(b)) {
return b;
}
b = APR_BUCKET_NEXT(b);
}
}
return NULL;
}
static apr_status_t add_buffered_data(h2_stream *stream, apr_off_t requested,
apr_off_t *plen, int *peos, int *is_all,
h2_headers **pheaders)
{
apr_bucket *b, *e;
*peos = 0;
*plen = 0;
*is_all = 0;
if (pheaders) {
*pheaders = NULL;
}
H2_STREAM_OUT_LOG(APLOG_TRACE2, stream, "add_buffered_data");
b = APR_BRIGADE_FIRST(stream->out_buffer);
while (b != APR_BRIGADE_SENTINEL(stream->out_buffer)) {
e = APR_BUCKET_NEXT(b);
if (APR_BUCKET_IS_METADATA(b)) {
if (APR_BUCKET_IS_FLUSH(b)) {
APR_BUCKET_REMOVE(b);
apr_bucket_destroy(b);
}
else if (APR_BUCKET_IS_EOS(b)) {
*peos = 1;
return APR_SUCCESS;
}
else if (H2_BUCKET_IS_HEADERS(b)) {
if (*plen > 0) {
/* data before the response, can only return up to here */
return APR_SUCCESS;
}
else if (pheaders) {
*pheaders = h2_bucket_headers_get(b);
APR_BUCKET_REMOVE(b);
apr_bucket_destroy(b);
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, stream->session->c,
H2_STRM_MSG(stream, "prep, -> response %d"),
(*pheaders)->status);
return APR_SUCCESS;
}
else {
return APR_EAGAIN;
}
}
}
else if (b->length == 0) {
APR_BUCKET_REMOVE(b);
apr_bucket_destroy(b);
}
else {
ap_assert(b->length != (apr_size_t)-1);
*plen += b->length;
if (*plen >= requested) {
*plen = requested;
return APR_SUCCESS;
}
}
b = e;
}
*is_all = 1;
return APR_SUCCESS;
}
apr_status_t h2_stream_out_prepare(h2_stream *stream, apr_off_t *plen,
int *peos, h2_headers **pheaders)
{
apr_status_t status = APR_SUCCESS;
apr_off_t requested, missing, max_chunk = H2_DATA_CHUNK_SIZE;
conn_rec *c;
int complete;
ap_assert(stream);
if (stream->rst_error) {
*plen = 0;
*peos = 1;
return APR_ECONNRESET;
}
c = stream->session->c;
prep_output(stream);
/* determine how much we'd like to send. We cannot send more than
* is requested. But we can reduce the size in case the master
* connection operates in smaller chunks. (TSL warmup) */
if (stream->session->io.write_size > 0) {
max_chunk = stream->session->io.write_size - H2_FRAME_HDR_LEN;
}
requested = (*plen > 0)? H2MIN(*plen, max_chunk) : max_chunk;
/* count the buffered data until eos or a headers bucket */
status = add_buffered_data(stream, requested, plen, peos, &complete, pheaders);
if (status == APR_EAGAIN) {
/* TODO: ugly, someone needs to retrieve the response first */
h2_mplx_keep_active(stream->session->mplx, stream);
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
H2_STRM_MSG(stream, "prep, response eagain"));
return status;
}
else if (status != APR_SUCCESS) {
return status;
}
if (pheaders && *pheaders) {
return APR_SUCCESS;
}
/* If there we do not have enough buffered data to satisfy the requested
* length *and* we counted the _complete_ buffer (and did not stop in the middle
* because of meta data there), lets see if we can read more from the
* output beam */
missing = H2MIN(requested, stream->max_mem) - *plen;
if (complete && !*peos && missing > 0) {
apr_status_t rv = APR_EOF;
if (stream->output) {
H2_STREAM_OUT_LOG(APLOG_TRACE2, stream, "pre");
rv = h2_beam_receive(stream->output, stream->out_buffer,
APR_NONBLOCK_READ, stream->max_mem - *plen);
H2_STREAM_OUT_LOG(APLOG_TRACE2, stream, "post");
}
if (rv == APR_SUCCESS) {
/* count the buffer again, now that we have read output */
status = add_buffered_data(stream, requested, plen, peos, &complete, pheaders);
}
else if (APR_STATUS_IS_EOF(rv)) {
apr_bucket *eos = apr_bucket_eos_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(stream->out_buffer, eos);
*peos = 1;
}
else if (APR_STATUS_IS_EAGAIN(rv)) {
/* we set this is the status of this call only if there
* is no buffered data, see check below */
}
else {
/* real error reading. Give this back directly, even though
* we may have something buffered. */
status = rv;
}
}
if (status == APR_SUCCESS) {
if (*peos || *plen) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
H2_STRM_MSG(stream, "prepare, len=%ld eos=%d"),
(long)*plen, *peos);
}
else {
status = (stream->output && h2_beam_is_closed(stream->output))? APR_EOF : APR_EAGAIN;
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
H2_STRM_MSG(stream, "prepare, no data"));
}
}
return status;
}
static int is_not_headers(apr_bucket *b)
{
return !H2_BUCKET_IS_HEADERS(b);
}
apr_status_t h2_stream_read_to(h2_stream *stream, apr_bucket_brigade *bb,
apr_off_t *plen, int *peos)
{
conn_rec *c = stream->session->c;
apr_status_t status = APR_SUCCESS;
if (stream->rst_error) {
return APR_ECONNRESET;
}
status = h2_append_brigade(bb, stream->out_buffer, plen, peos, is_not_headers);
if (status == APR_SUCCESS && !*peos && !*plen) {
status = APR_EAGAIN;
}
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, status, c,
H2_STRM_MSG(stream, "read_to, len=%ld eos=%d"),
(long)*plen, *peos);
return status;
}
apr_status_t h2_stream_submit_pushes(h2_stream *stream, h2_headers *response)
{
apr_status_t status = APR_SUCCESS;
apr_array_header_t *pushes;
int i;
pushes = h2_push_collect_update(stream, stream->request, response);
if (pushes && !apr_is_empty_array(pushes)) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, stream->session->c,
H2_STRM_MSG(stream, "found %d push candidates"),
pushes->nelts);
for (i = 0; i < pushes->nelts; ++i) {
h2_push *push = APR_ARRAY_IDX(pushes, i, h2_push*);
h2_stream *s = h2_session_push(stream->session, stream, push);
if (!s) {
status = APR_ECONNRESET;
break;
}
}
}
return status;
}
apr_table_t *h2_stream_get_trailers(h2_stream *stream)
{
return NULL;
}
const h2_priority *h2_stream_get_priority(h2_stream *stream,
h2_headers *response)
{
if (response && stream->initiated_on) {
const char *ctype = apr_table_get(response->headers, "content-type");
if (ctype) {
/* FIXME: Not good enough, config needs to come from request->server */
return h2_cconfig_get_priority(stream->session->c, ctype);
}
}
return NULL;
}
int h2_stream_is_ready(h2_stream *stream)
{
if (stream->has_response) {
return 1;
}
else if (stream->out_buffer && get_first_headers_bucket(stream->out_buffer)) {
return 1;
}
return 0;
}
int h2_stream_was_closed(const h2_stream *stream)
{
switch (stream->state) {
case H2_SS_CLOSED:
case H2_SS_CLEANUP:
return 1;
default:
return 0;
}
}
apr_status_t h2_stream_in_consumed(h2_stream *stream, apr_off_t amount)
{
h2_session *session = stream->session;
if (amount > 0) {
apr_off_t consumed = amount;
while (consumed > 0) {
int len = (consumed > INT_MAX)? INT_MAX : (int)consumed;
nghttp2_session_consume(session->ngh2, stream->id, len);
consumed -= len;
}
#ifdef H2_NG2_LOCAL_WIN_SIZE
if (1) {
int cur_size = nghttp2_session_get_stream_local_window_size(
session->ngh2, stream->id);
int win = stream->in_window_size;
int thigh = win * 8/10;
int tlow = win * 2/10;
const int win_max = 2*1024*1024;
const int win_min = 32*1024;
/* Work in progress, probably should add directives for these
* values once this stabilizes somewhat. The general idea is
* to adapt stream window sizes if the input window changes
* a) very quickly (< good RTT) from full to empty
* b) only a little bit (> bad RTT)
* where in a) it grows and in b) it shrinks again.
*/
if (cur_size > thigh && amount > thigh && win < win_max) {
/* almost empty again with one reported consumption, how
* long did this take? */
long ms = apr_time_msec(apr_time_now() - stream->in_last_write);
if (ms < 40) {
win = H2MIN(win_max, win + (64*1024));
}
}
else if (cur_size < tlow && amount < tlow && win > win_min) {
/* staying full, for how long already? */
long ms = apr_time_msec(apr_time_now() - stream->in_last_write);
if (ms > 700) {
win = H2MAX(win_min, win - (32*1024));
}
}
if (win != stream->in_window_size) {
stream->in_window_size = win;
nghttp2_session_set_local_window_size(session->ngh2,
NGHTTP2_FLAG_NONE, stream->id, win);
}
ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c,
"h2_stream(%ld-%d): consumed %ld bytes, window now %d/%d",
session->id, stream->id, (long)amount,
cur_size, stream->in_window_size);
}
#endif
}
return APR_SUCCESS;
}