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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-08 19:09:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-08 19:09:22 +0000
commit2faa747e2303ee774a4b4aace961188e950e185a (patch)
tree604e79c7481956ce48f458e3546eaf1090b3ffff /modules/http2/h2_session.c
parentInitial commit. (diff)
downloadapache2-2faa747e2303ee774a4b4aace961188e950e185a.tar.xz
apache2-2faa747e2303ee774a4b4aace961188e950e185a.zip
Adding upstream version 2.4.58.upstream/2.4.58
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'modules/http2/h2_session.c')
-rw-r--r--modules/http2/h2_session.c2024
1 files changed, 2024 insertions, 0 deletions
diff --git a/modules/http2/h2_session.c b/modules/http2/h2_session.c
new file mode 100644
index 0000000..1e560e4
--- /dev/null
+++ b/modules/http2/h2_session.c
@@ -0,0 +1,2024 @@
+/* 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_atomic.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 <http_protocol.h>
+#include <scoreboard.h>
+
+#include <mpm_common.h>
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h> /* for getpid() */
+#endif
+
+#include "h2_private.h"
+#include "h2.h"
+#include "h2_bucket_beam.h"
+#include "h2_bucket_eos.h"
+#include "h2_config.h"
+#include "h2_conn_ctx.h"
+#include "h2_protocol.h"
+#include "h2_mplx.h"
+#include "h2_push.h"
+#include "h2_request.h"
+#include "h2_headers.h"
+#include "h2_stream.h"
+#include "h2_c2.h"
+#include "h2_session.h"
+#include "h2_util.h"
+#include "h2_version.h"
+#include "h2_workers.h"
+
+
+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);
+}
+
+void h2_session_event(h2_session *session, h2_session_event_t ev,
+ int err, const char *msg)
+{
+ h2_session_dispatch_event(session, ev, err, msg);
+}
+
+static int rst_unprocessed_stream(h2_stream *stream, void *ctx)
+{
+ int unprocessed = (!h2_stream_is_at_or_past(stream, H2_SS_CLOSED)
+ && (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_c1_streams_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 priority order of streams.
+ * - 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 rv;
+ (void)ngh2;
+ (void)flags;
+
+ if (h2_c1_io_needs_flush(&session->io)) {
+ return NGHTTP2_ERR_WOULDBLOCK;
+ }
+
+ rv = h2_c1_io_add_data(&session->io, (const char *)data, length);
+ if (APR_SUCCESS == rv) {
+ return length;
+ }
+ else if (APR_STATUS_IS_EAGAIN(rv)) {
+ return NGHTTP2_ERR_WOULDBLOCK;
+ }
+ else {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, rv, session->c1,
+ APLOGNO(03062) "h2_session: send error");
+ return h2_session_status_from_apr_status(rv);
+ }
+}
+
+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->c1)) {
+ char buffer[256];
+
+ h2_util_frame_print(frame, buffer, sizeof(buffer)/sizeof(buffer[0]));
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1,
+ 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) {
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c1,
+ H2_SSSN_STRM_MSG(session, stream_id, "write %ld bytes of DATA"),
+ (long)len);
+ status = h2_stream_recv_DATA(stream, flags, data, len);
+ }
+ else {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1, APLOGNO(03064)
+ H2_SSSN_STRM_MSG(session, stream_id,
+ "on_data_chunk for unknown stream"));
+ 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->c1,
+ H2_STRM_LOG(APLOGNO(03065), stream,
+ "closing with err=%d %s"),
+ (int)error_code, h2_protocol_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 = NULL;
+
+ /* 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 if (session->local.accepting) {
+ 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->c1, APLOGNO(02920)
+ H2_SSSN_STRM_MSG(session, frame->hd.stream_id,
+ "on_header unknown stream"));
+ return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
+ }
+
+ status = h2_stream_add_header(stream, (const char *)name, namelen,
+ (const char *)value, valuelen);
+ if (status != APR_SUCCESS
+ && (!stream->rtmp
+ || stream->rtmp->http_status == H2_HTTP_STATUS_UNSET)) {
+ 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;
+
+ stream = frame->hd.stream_id? get_stream(session, frame->hd.stream_id) : NULL;
+ if (APLOGcdebug(session->c1)) {
+ char buffer[256];
+
+ h2_util_frame_print(frame, buffer, sizeof(buffer)/sizeof(buffer[0]));
+ if (stream) {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1,
+ H2_STRM_LOG(APLOGNO(10302), stream,
+ "recv FRAME[%s], frames=%ld/%ld (r/s)"),
+ buffer, (long)session->frames_received,
+ (long)session->frames_sent);
+ }
+ else {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1,
+ 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 */
+ if (stream) {
+ rv = h2_stream_recv_frame(stream, NGHTTP2_HEADERS, frame->hd.flags,
+ frame->hd.length + H2_FRAME_HDR_LEN);
+ }
+ break;
+ case NGHTTP2_DATA:
+ if (stream) {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1,
+ 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->c1,
+ H2_SSSN_STRM_MSG(session, frame->hd.stream_id, "PRIORITY frame "
+ " weight=%d, dependsOn=%d, exclusive=%d"),
+ 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->c1,
+ H2_SSSN_STRM_MSG(session, frame->hd.stream_id,
+ "WINDOW_UPDATE incr=%d"),
+ frame->window_update.window_size_increment);
+ break;
+ case NGHTTP2_RST_STREAM:
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1, APLOGNO(03067)
+ H2_SSSN_STRM_MSG(session, frame->hd.stream_id,
+ "RST_STREAM by client, error=%d"),
+ (int)frame->rst_stream.error_code);
+ if (stream) {
+ rv = h2_stream_recv_frame(stream, NGHTTP2_RST_STREAM, frame->hd.flags,
+ frame->hd.length + H2_FRAME_HDR_LEN);
+ }
+ if (stream && stream->initiated_on) {
+ /* A stream reset on a request we sent it. Normal, when the
+ * client does not want it. */
+ ++session->pushes_reset;
+ }
+ else {
+ /* A stream reset on a request it sent us. Could happen in a browser
+ * when the user navigates away or cancels loading - maybe. */
+ h2_mplx_c1_client_rst(session->mplx, frame->hd.stream_id,
+ stream);
+ }
+ ++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;
+ h2_session_dispatch_event(session, H2_SESSION_EV_REMOTE_GOAWAY,
+ frame->goaway.error_code, NULL);
+ }
+ break;
+ case NGHTTP2_SETTINGS:
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c1,
+ H2_SSSN_MSG(session, "SETTINGS, len=%ld"), (long)frame->hd.length);
+ break;
+ default:
+ if (APLOGctrace2(session->c1)) {
+ char buffer[256];
+
+ h2_util_frame_print(frame, buffer,
+ sizeof(buffer)/sizeof(buffer[0]));
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c1,
+ 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->c1,
+ 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 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;
+ 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->c1,
+ APLOGNO(02924)
+ H2_SSSN_STRM_MSG(session, stream_id, "send_data, stream not found"));
+ return NGHTTP2_ERR_CALLBACK_FAILURE;
+ }
+
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c1,
+ H2_STRM_MSG(stream, "send_data_cb for %ld bytes"),
+ (long)length);
+
+ status = h2_c1_io_add_data(&session->io, (const char *)framehd, H2_FRAME_HDR_LEN);
+ if (padlen && status == APR_SUCCESS) {
+ --padlen;
+ status = h2_c1_io_add_data(&session->io, (const char *)&padlen, 1);
+ }
+
+ if (status != APR_SUCCESS) {
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE1, status, session->c1,
+ 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->c1,
+ H2_STRM_MSG(stream, "send_data_cb, reading stream"));
+ apr_brigade_cleanup(session->bbtmp);
+ return NGHTTP2_ERR_CALLBACK_FAILURE;
+ }
+ else if (len != (apr_off_t)length) {
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE1, status, session->c1,
+ 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->c1->bucket_alloc);
+ APR_BRIGADE_INSERT_TAIL(session->bbtmp, b);
+ }
+
+ status = h2_c1_io_append(&session->io, session->bbtmp);
+ apr_brigade_cleanup(session->bbtmp);
+
+ if (status == APR_SUCCESS) {
+ stream->out_data_frames++;
+ stream->out_data_octets += length;
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c1,
+ H2_STRM_MSG(stream, "sent data length=%ld, total=%ld"),
+ (long)length, (long)stream->out_data_octets);
+ return 0;
+ }
+ else {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, session->c1,
+ 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;
+ }
+
+ stream = get_stream(session, stream_id);
+ if (APLOGcdebug(session->c1)) {
+ char buffer[256];
+
+ h2_util_frame_print(frame, buffer, sizeof(buffer)/sizeof(buffer[0]));
+ if (stream) {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1,
+ H2_STRM_LOG(APLOGNO(10303), stream,
+ "sent FRAME[%s], frames=%ld/%ld (r/s)"),
+ buffer, (long)session->frames_received,
+ (long)session->frames_sent);
+ }
+ else {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1,
+ H2_SSSN_LOG(APLOGNO(03068), session,
+ "sent FRAME[%s], frames=%ld/%ld (r/s)"),
+ buffer, (long)session->frames_received,
+ (long)session->frames_sent);
+ }
+ }
+
+ 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;
+
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1, APLOGNO(03456)
+ H2_SSSN_STRM_MSG(session, frame->hd.stream_id,
+ "invalid header '%.*s: %.*s'"),
+ (int)namelen, name, (int)valuelen, value);
+ 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;
+ size_t frame_len = frame->hd.length + H2_FRAME_HDR_LEN; /* the total length without padding */
+ size_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;
+ }
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c1,
+ "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 void update_child_status(h2_session *session, int status,
+ const char *msg, const h2_stream *stream)
+{
+ /* 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) {
+ char sbuffer[1024];
+ sbuffer[0] = '\0';
+ if (stream) {
+ apr_snprintf(sbuffer, sizeof(sbuffer),
+ ": stream %d, %s %s",
+ stream->id,
+ stream->request? stream->request->method : "",
+ stream->request? stream->request->path : "");
+ }
+ apr_snprintf(session->status, sizeof(session->status),
+ "[%d/%d] %s%s",
+ (int)(session->remote.emitted_count + session->pushes_submitted),
+ (int)session->streams_done,
+ msg? msg : "-", sbuffer);
+ ap_update_child_status_from_server(session->c1->sbh, status,
+ session->c1, session->s);
+ ap_update_child_status_descr(session->c1->sbh, status, session->status);
+ }
+}
+
+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_c1_io_assure_flushed(&session->io);
+ }
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1,
+ 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 (error && !msg) {
+ if (APR_STATUS_IS_EPIPE(error)) {
+ msg = "remote close";
+ }
+ }
+
+ 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_c1_shutdown(session->mplx);
+ session->local.error = error;
+ session->local.error_msg = msg;
+ }
+ 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->c1->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_c1_io_assure_flushed(&session->io);
+ }
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1,
+ H2_SSSN_LOG(APLOGNO(03069), session,
+ "sent GOAWAY, err=%d, msg=%s"), error, msg? msg : "");
+ }
+ h2_session_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->c1;
+ 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_DEBUG, 0, c,
+ H2_SSSN_LOG(APLOGNO(03199), session,
+ "connection disappeared without proper "
+ "goodbye, clients will be confused, should not happen"));
+ }
+
+ if (!h2_iq_empty(session->ready_to_process)) {
+ int sid;
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c,
+ H2_SSSN_LOG(APLOGNO(10485), session,
+ "cleanup, resetting %d streams in ready-to-process"),
+ h2_iq_count(session->ready_to_process));
+ while ((sid = h2_iq_shift(session->ready_to_process)) > 0) {
+ h2_mplx_c1_client_rst(session->mplx, sid, get_stream(session, sid));
+ }
+ }
+
+ transit(session, trigger, H2_SESSION_ST_CLEANUP);
+ h2_mplx_c1_destroy(session->mplx);
+ session->mplx = NULL;
+
+ ap_assert(session->ngh2);
+ nghttp2_session_del(session->ngh2);
+ session->ngh2 = NULL;
+ h2_conn_ctx_detach(c);
+
+ return APR_SUCCESS;
+}
+
+static apr_status_t session_pool_cleanup(void *data)
+{
+ conn_rec *c = data;
+ h2_conn_ctx_t *conn_ctx = h2_conn_ctx_get(c);
+ h2_session *session = conn_ctx? conn_ctx->session : NULL;
+
+ if (session) {
+ int mpm_state = 0;
+ int level;
+
+ ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state);
+ level = (AP_MPMQ_STOPPING == mpm_state)? APLOG_DEBUG : APLOG_WARNING;
+ /* 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.
+ * However, when the server is stopping, it may shutdown connections
+ * without running the pre_close hooks. Do not want about that. */
+ ap_log_cerror(APLOG_MARK, level, 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;
+}
+
+static /* atomic */ apr_uint32_t next_id;
+
+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;
+ uint32_t n;
+ int thread_num;
+ apr_pool_t *pool = NULL;
+ h2_session *session;
+ h2_stream *stream0;
+ apr_status_t status;
+ int rv;
+
+ *psession = NULL;
+ apr_pool_create(&pool, c->pool);
+ apr_pool_tag(pool, "h2_session");
+ session = apr_pcalloc(pool, sizeof(h2_session));
+ if (!session) {
+ return APR_ENOMEM;
+ }
+
+ *psession = session;
+ /* c->id does not give a unique id for the lifetime of the session.
+ * mpms like event change c->id when re-activating a keepalive
+ * connection based on the child_num+thread_num of the worker
+ * processing it.
+ * We'd like to have an id that remains constant and unique bc
+ * h2 streams can live through keepalive periods. While double id
+ * will not lead to processing failures, it will confuse log analysis.
+ */
+#if AP_MODULE_MAGIC_AT_LEAST(20211221, 8)
+ ap_sb_get_child_thread(c->sbh, &session->child_num, &thread_num);
+#else
+ (void)thread_num;
+ session->child_num = (int)getpid();
+#endif
+ session->id = apr_atomic_inc32(&next_id);
+ session->c1 = 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);
+ session->max_data_frame_len = h2_config_sgeti(s, H2_CONF_MAX_DATA_FRAME_LEN);
+
+ session->out_c1_blocked = h2_iq_create(session->pool, (int)session->max_stream_count);
+ session->ready_to_process = h2_iq_create(session->pool, (int)session->max_stream_count);
+
+ session->monitor = apr_pcalloc(pool, sizeof(h2_stream_monitor));
+ 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;
+
+ stream0 = h2_stream_create(0, session->pool, session, NULL, 0);
+ stream0->c2 = session->c1; /* stream0's connection is the main connection */
+ session->mplx = h2_mplx_c1_create(session->child_num, session->id,
+ stream0, s, session->pool, workers);
+ if (!session->mplx) {
+ apr_pool_destroy(pool);
+ return APR_ENOTIMPL;
+ }
+
+ h2_c1_io_init(&session->io, session);
+ 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);
+#ifdef H2_NG2_NO_CLOSED_STREAMS
+ /* We do not want nghttp2 to keep information about closed streams as
+ * that accumulates memory on long connections. This makes PRIORITY
+ * setting in relation to older streams non-working. */
+ nghttp2_option_set_no_closed_streams(options, 1);
+#endif
+#ifdef H2_NG2_RFC9113_STRICTNESS
+ /* nghttp2 v1.50.0 introduces the strictness checks on leading/trailing
+ * whitespace of RFC 9113 for fields. But, by default, it RST streams
+ * carrying such. We do not want that. We want to strip the ws and
+ * handle them, just like the HTTP/1.1 parser does. */
+ nghttp2_option_set_no_rfc9113_leading_and_trailing_ws_validation(options, 1);
+#endif
+ 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), "
+ "max_data_frame_len=%d"),
+ (int)session->max_stream_count,
+ (int)session->max_stream_mem,
+ session->mplx->processing_limit,
+ session->mplx->processing_max,
+ session->push_diary->dtype,
+ (int)session->push_diary->N,
+ (int)session->max_data_frame_len);
+ }
+
+ 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[4];
+ 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;
+ }
+#if H2_USE_WEBSOCKETS
+ if (h2_config_sgeti(session->s, H2_CONF_WEBSOCKETS)) {
+ settings[slen].settings_id = NGHTTP2_SETTINGS_ENABLE_CONNECT_PROTOCOL;
+ settings[slen].value = 1;
+ ++slen;
+ }
+#endif
+
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, session->c1,
+ 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->c1,
+ 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->c1,
+ H2_SSSN_LOG(APLOGNO(02970), session,
+ "nghttp2_submit_window_update: %s"),
+ nghttp2_strerror(*rv));
+ }
+ }
+
+ return status;
+}
+
+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->c1,
+ 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->c1,
+ 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->c1,
+ H2_STRM_LOG(APLOGNO(03077), is,
+ "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);
+ 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;
+ 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->c1,
+ 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->c1, APLOGNO(03202)
+ H2_SSSN_STRM_MSG(session, id_parent,
+ "PUSH BEFORE, weight=%d, depends=%d, returned=%d"),
+ 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->c1,
+ 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;
+ }
+
+ 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 int h2_session_want_send(h2_session *session)
+{
+ return nghttp2_session_want_write(session->ngh2)
+ || h2_c1_io_pending(&session->io);
+}
+
+static apr_status_t h2_session_send(h2_session *session)
+{
+ int ngrv, pending = 0;
+ apr_status_t rv = APR_SUCCESS;
+
+ while (nghttp2_session_want_write(session->ngh2)) {
+ ngrv = nghttp2_session_send(session->ngh2);
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c1,
+ "nghttp2_session_send: %d", (int)ngrv);
+ pending = 1;
+ if (ngrv != 0 && ngrv != NGHTTP2_ERR_WOULDBLOCK) {
+ if (nghttp2_is_fatal(ngrv)) {
+ h2_session_dispatch_event(session, H2_SESSION_EV_PROTO_ERROR,
+ ngrv, nghttp2_strerror(ngrv));
+ rv = APR_EGENERAL;
+ goto cleanup;
+ }
+ }
+ if (h2_c1_io_needs_flush(&session->io) ||
+ ngrv == NGHTTP2_ERR_WOULDBLOCK) {
+ rv = h2_c1_io_assure_flushed(&session->io);
+ if (rv != APR_SUCCESS)
+ goto cleanup;
+ pending = 0;
+ }
+ }
+ if (pending) {
+ rv = h2_c1_io_pass(&session->io);
+ }
+cleanup:
+ if (rv != APR_SUCCESS) {
+ h2_session_dispatch_event(session, H2_SESSION_EV_CONN_ERROR, rv, NULL);
+ }
+ return rv;
+}
+
+/**
+ * A streams input state has changed.
+ */
+static void on_stream_input(void *ctx, h2_stream *stream)
+{
+ h2_session *session = ctx;
+
+ ap_assert(stream);
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c1,
+ H2_STRM_MSG(stream, "on_input change"));
+ update_child_status(session, SERVER_BUSY_READ, "read", stream);
+ if (stream->id == 0) {
+ /* input on primary connection available? read */
+ h2_c1_read(session);
+ }
+ else {
+ h2_stream_on_input_change(stream);
+ }
+}
+
+/**
+ * A streams output state has changed.
+ */
+static void on_stream_output(void *ctx, h2_stream *stream)
+{
+ h2_session *session = ctx;
+
+ ap_assert(stream);
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c1,
+ H2_STRM_MSG(stream, "on_output change"));
+ if (stream->id != 0) {
+ update_child_status(session, SERVER_BUSY_WRITE, "write", stream);
+ h2_stream_on_output_change(stream);
+ }
+}
+
+
+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 transit(h2_session *session, const char *action, h2_session_state nstate)
+{
+ int ostate;
+
+ if (session->state != nstate) {
+ ostate = session->state;
+
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1,
+ 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. */
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, session->c1,
+ H2_SSSN_LOG("", session, "enter idle"));
+ }
+ else {
+ /* normal keepalive setup */
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, session->c1,
+ H2_SSSN_LOG("", session, "enter keepalive"));
+ }
+ session->state = nstate;
+ break;
+ case H2_SESSION_ST_DONE:
+ break;
+ default:
+ /* nop */
+ session->state = nstate;
+ 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_input_pending(h2_session *session, int arg, const char *msg)
+{
+ switch (session->state) {
+ case H2_SESSION_ST_INIT:
+ case H2_SESSION_ST_IDLE:
+ case H2_SESSION_ST_WAIT:
+ transit(session, "input read", H2_SESSION_ST_BUSY);
+ break;
+ default:
+ break;
+ }
+}
+
+static void h2_session_ev_input_exhausted(h2_session *session, int arg, const char *msg)
+{
+ switch (session->state) {
+ case H2_SESSION_ST_BUSY:
+ if (!h2_session_want_send(session)) {
+ if (session->open_streams == 0) {
+ transit(session, "input exhausted, no streams", H2_SESSION_ST_IDLE);
+ }
+ else {
+ transit(session, "input exhausted", H2_SESSION_ST_WAIT);
+ }
+ }
+ break;
+ case H2_SESSION_ST_WAIT:
+ if (session->open_streams == 0) {
+ transit(session, "input exhausted, no streams", H2_SESSION_ST_IDLE);
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+static void h2_session_ev_local_goaway(h2_session *session, int arg, const char *msg)
+{
+ cleanup_unprocessed_streams(session);
+ 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);
+ 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->c1,
+ 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->c1,
+ 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_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);
+#if !AP_MODULE_MAGIC_AT_LEAST(20120211, 110)
+ h2_workers_graceful_shutdown(session->workers);
+#endif
+ 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 h2_session_ev_no_more_streams(h2_session *session)
+{
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1,
+ H2_SSSN_LOG(APLOGNO(10304), session, "no more streams"));
+ switch (session->state) {
+ case H2_SESSION_ST_BUSY:
+ case H2_SESSION_ST_WAIT:
+ if (!h2_session_want_send(session)) {
+ if (session->local.accepting) {
+ /* We wait for new frames on c1 only. */
+ transit(session, "all streams done", H2_SESSION_ST_IDLE);
+ }
+ else {
+ /* We are no longer accepting new streams.
+ * Time to leave. */
+ h2_session_shutdown(session, 0, "done", 0);
+ transit(session, "c1 done after goaway", H2_SESSION_ST_DONE);
+ }
+ }
+ else {
+ transit(session, "no more streams", H2_SESSION_ST_WAIT);
+ }
+ break;
+ default:
+ /* nop */
+ break;
+ }
+}
+
+static void ev_stream_created(h2_session *session, h2_stream *stream)
+{
+ /* nop */
+}
+
+static void ev_stream_open(h2_session *session, h2_stream *stream)
+{
+ 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;
+ }
+ }
+ /* Stream state OPEN means we have received all request headers
+ * and can start processing the stream. */
+ h2_iq_append(session->ready_to_process, stream->id);
+ update_child_status(session, SERVER_BUSY_READ, "schedule", stream);
+}
+
+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;
+ }
+ /* 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. */
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c1,
+ H2_STRM_MSG(stream, "adding h2_eos to c1 out"));
+ b = h2_bucket_eos_create(session->c1->bucket_alloc, stream);
+ APR_BRIGADE_INSERT_TAIL(session->bbtmp, b);
+ h2_c1_io_append(&session->io, session->bbtmp);
+ apr_brigade_cleanup(session->bbtmp);
+}
+
+static void on_stream_state_enter(void *ctx, h2_stream *stream)
+{
+ h2_session *session = ctx;
+
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c1,
+ H2_STRM_MSG(stream, "entered state"));
+ switch (stream->state) {
+ case H2_SS_IDLE: /* stream was created */
+ ev_stream_created(session, stream);
+ break;
+ case H2_SS_OPEN: /* stream has request headers */
+ case H2_SS_RSVD_L:
+ ev_stream_open(session, stream);
+ break;
+ case H2_SS_CLOSED_L: /* stream output was closed, but remote end is not */
+ /* If the stream is still being processed, it could still be reading
+ * its input (theoretically, http request hangling does not normally).
+ * But when processing is done, we need to cancel the stream as no
+ * one is consuming the input any longer.
+ * This happens, for example, on a large POST when the response
+ * is ready early due to the POST being denied. */
+ if (!h2_mplx_c1_stream_is_running(session->mplx, stream)) {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, session->c1,
+ H2_STRM_LOG(APLOGNO(10305), stream, "remote close missing"));
+ nghttp2_submit_rst_stream(session->ngh2, NGHTTP2_FLAG_NONE,
+ stream->id, H2_ERR_NO_ERROR);
+ }
+ break;
+ case H2_SS_CLOSED_R: /* stream input was closed */
+ break;
+ case H2_SS_CLOSED: /* stream in+out were closed */
+ ev_stream_closed(session, stream);
+ break;
+ case H2_SS_CLEANUP:
+ nghttp2_session_set_stream_user_data(session->ngh2, stream->id, NULL);
+ h2_mplx_c1_stream_cleanup(session->mplx, stream, &session->open_streams);
+ ++session->streams_done;
+ update_child_status(session, SERVER_BUSY_WRITE, "done", stream);
+ break;
+ default:
+ break;
+ }
+}
+
+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:
+ session->input_flushed = 1;
+ break;
+ case H2_SEV_OUT_C1_BLOCK:
+ h2_iq_append(session->out_c1_blocked, 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;
+ }
+}
+
+void h2_session_dispatch_event(h2_session *session, h2_session_event_t ev,
+ apr_status_t arg, const char *msg)
+{
+ switch (ev) {
+ case H2_SESSION_EV_INIT:
+ h2_session_ev_init(session, arg, msg);
+ break;
+ case H2_SESSION_EV_INPUT_PENDING:
+ h2_session_ev_input_pending(session, arg, msg);
+ break;
+ case H2_SESSION_EV_INPUT_EXHAUSTED:
+ h2_session_ev_input_exhausted(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_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_NO_MORE_STREAMS:
+ h2_session_ev_no_more_streams(session);
+ break;
+ default:
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, session->c1,
+ H2_SSSN_MSG(session, "unknown event %d"), ev);
+ break;
+ }
+}
+
+static void unblock_c1_out(h2_session *session) {
+ int sid;
+
+ while ((sid = h2_iq_shift(session->out_c1_blocked)) > 0) {
+ nghttp2_session_resume_data(session->ngh2, sid);
+ }
+}
+
+apr_status_t h2_session_process(h2_session *session, int async)
+{
+ apr_status_t status = APR_SUCCESS;
+ conn_rec *c = session->c1;
+ int rv, mpm_state, trace = APLOGctrace3(c);
+
+ if (trace) {
+ ap_log_cerror( APLOG_MARK, APLOG_TRACE3, status, c,
+ H2_SSSN_MSG(session, "process start, async=%d"), async);
+ }
+
+ if (H2_SESSION_ST_INIT == session->state) {
+ if (!h2_protocol_is_acceptable_c1(c, session->r, 1)) {
+ const char *msg = nghttp2_strerror(NGHTTP2_INADEQUATE_SECURITY);
+ update_child_status(session, SERVER_BUSY_READ, msg, NULL);
+ h2_session_shutdown(session, APR_EINVAL, msg, 1);
+ }
+ else {
+ update_child_status(session, SERVER_BUSY_READ, "init", NULL);
+ 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) {
+ h2_session_dispatch_event(session,
+ H2_SESSION_EV_CONN_ERROR, status, NULL);
+ }
+ else {
+ h2_session_dispatch_event(session, H2_SESSION_EV_INIT, 0, NULL);
+ }
+ }
+ }
+
+ while (session->state != H2_SESSION_ST_DONE) {
+
+ /* PR65731: we may get a new connection to process while the
+ * MPM already is stopping. For example due to having reached
+ * MaxRequestsPerChild limit.
+ * Since this is supposed to handle things gracefully, we need to:
+ * a) fully initialize the session before GOAWAYing
+ * b) give the client the chance to submit at least one request
+ */
+ if (session->state != H2_SESSION_ST_INIT /* no longer intializing */
+ && session->local.accepted_max > 0 /* have gotten at least one stream */
+ && session->local.accepting /* have not already locally shut down */
+ && !ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state)) {
+ if (mpm_state == AP_MPMQ_STOPPING) {
+ h2_session_dispatch_event(session, H2_SESSION_EV_MPM_STOPPING, 0, NULL);
+ }
+ }
+
+ session->status[0] = '\0';
+
+ if (h2_session_want_send(session)) {
+ h2_session_send(session);
+ }
+ else if (!nghttp2_session_want_read(session->ngh2)) {
+ h2_session_dispatch_event(session, H2_SESSION_EV_NGH2_DONE, 0, NULL);
+ }
+
+ if (!h2_iq_empty(session->ready_to_process)) {
+ h2_mplx_c1_process(session->mplx, session->ready_to_process,
+ get_stream, stream_pri_cmp, session,
+ &session->open_streams);
+ transit(session, "scheduled stream", H2_SESSION_ST_BUSY);
+ }
+
+ if (session->input_flushed) {
+ transit(session, "forwarded input", H2_SESSION_ST_BUSY);
+ session->input_flushed = 0;
+ }
+
+ if (!h2_iq_empty(session->out_c1_blocked)) {
+ unblock_c1_out(session);
+ transit(session, "unblocked output", H2_SESSION_ST_BUSY);
+ }
+
+ if (session->reprioritize) {
+ h2_mplx_c1_reprioritize(session->mplx, stream_pri_cmp, session);
+ session->reprioritize = 0;
+ }
+
+ if (h2_session_want_send(session)) {
+ h2_session_send(session);
+ }
+
+ status = h2_c1_io_assure_flushed(&session->io);
+ if (APR_SUCCESS != status) {
+ h2_session_dispatch_event(session, H2_SESSION_EV_CONN_ERROR, status, NULL);
+ }
+
+ switch (session->state) {
+ case H2_SESSION_ST_INIT:
+ ap_assert(0);
+ h2_c1_read(session);
+ break;
+
+ case H2_SESSION_ST_IDLE:
+ ap_assert(session->open_streams == 0);
+ ap_assert(nghttp2_session_want_read(session->ngh2));
+ if (!h2_session_want_send(session)) {
+ /* Give any new incoming request a short grace period to
+ * arrive while we are still hot and return to the mpm
+ * connection handling when nothing really happened. */
+ h2_c1_read(session);
+ if (H2_SESSION_ST_IDLE == session->state) {
+ if (async) {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, c,
+ H2_SSSN_LOG(APLOGNO(10306), session,
+ "returning to mpm c1 monitoring"));
+ goto leaving;
+ }
+ else {
+ /* Not an async mpm, we must continue waiting
+ * for client data to arrive until the configured
+ * server Timeout/KeepAliveTimeout happens */
+ apr_time_t timeout = (session->open_streams == 0)?
+ session->s->keep_alive_timeout :
+ session->s->timeout;
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, status, c,
+ H2_SSSN_MSG(session, "polling timeout=%d"),
+ (int)apr_time_sec(timeout));
+ status = h2_mplx_c1_poll(session->mplx, timeout,
+ on_stream_input,
+ on_stream_output, session);
+ if (APR_STATUS_IS_TIMEUP(status)) {
+ if (session->open_streams == 0) {
+ h2_session_dispatch_event(session,
+ H2_SESSION_EV_CONN_TIMEOUT, status, NULL);
+ break;
+ }
+ }
+ else if (APR_SUCCESS != status) {
+ h2_session_dispatch_event(session,
+ H2_SESSION_EV_CONN_ERROR, status, NULL);
+ break;
+ }
+ }
+ }
+ }
+ else {
+ transit(session, "c1 io pending", H2_SESSION_ST_BUSY);
+ }
+ break;
+
+ case H2_SESSION_ST_BUSY:
+ /* IO happening in and out. Make sure we react to c2 events
+ * inbetween send and receive. */
+ status = h2_mplx_c1_poll(session->mplx, 0,
+ on_stream_input, on_stream_output, session);
+ if (APR_SUCCESS != status && !APR_STATUS_IS_TIMEUP(status)) {
+ h2_session_dispatch_event(session, H2_SESSION_EV_CONN_ERROR, status, NULL);
+ break;
+ }
+ h2_c1_read(session);
+ break;
+
+ case H2_SESSION_ST_WAIT:
+ status = h2_c1_io_assure_flushed(&session->io);
+ if (APR_SUCCESS != status) {
+ h2_session_dispatch_event(session, H2_SESSION_EV_CONN_ERROR, status, NULL);
+ break;
+ }
+ if (session->open_streams == 0) {
+ h2_session_dispatch_event(session, H2_SESSION_EV_NO_MORE_STREAMS,
+ 0, "streams really done");
+ if (session->state != H2_SESSION_ST_WAIT) {
+ break;
+ }
+ }
+ /* No IO happening and input is exhausted. Make sure we have
+ * flushed any possibly pending output and then wait with
+ * the c1 connection timeout for sth to happen in our c1/c2 sockets/pipes */
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, status, c,
+ H2_SSSN_MSG(session, "polling timeout=%d, open_streams=%d"),
+ (int)apr_time_sec(session->s->timeout), session->open_streams);
+ status = h2_mplx_c1_poll(session->mplx, session->s->timeout,
+ on_stream_input, on_stream_output, session);
+ if (APR_STATUS_IS_TIMEUP(status)) {
+ /* If we timeout without streams open, no new request from client
+ * arrived.
+ * If we timeout without nghttp2 wanting to write something, but
+ * all open streams have something to send, it means we are
+ * blocked on HTTP/2 flow control and the client did not send
+ * WINDOW_UPDATEs to us. */
+ if (session->open_streams == 0 ||
+ (!h2_session_want_send(session) &&
+ h2_mplx_c1_all_streams_want_send_data(session->mplx))) {
+ h2_session_dispatch_event(session, H2_SESSION_EV_CONN_TIMEOUT, status, NULL);
+ break;
+ }
+ }
+ else if (APR_SUCCESS != status) {
+ h2_session_dispatch_event(session, H2_SESSION_EV_CONN_ERROR, status, NULL);
+ break;
+ }
+ break;
+
+ case H2_SESSION_ST_DONE:
+ h2_c1_read(session);
+ break;
+
+ default:
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EGENERAL, c,
+ H2_SSSN_LOG(APLOGNO(03080), session,
+ "unknown state"));
+ h2_session_dispatch_event(session, H2_SESSION_EV_PROTO_ERROR, APR_EGENERAL, NULL);
+ break;
+ }
+ }
+
+leaving:
+ if (trace) {
+ ap_log_cerror( APLOG_MARK, APLOG_TRACE3, status, c,
+ H2_SSSN_MSG(session, "process returns"));
+ }
+ h2_mplx_c1_going_keepalive(session->mplx);
+
+ if (session->state == H2_SESSION_ST_DONE) {
+ if (session->local.error) {
+ char buffer[128];
+ const char *msg;
+ if (session->local.error_msg) {
+ msg = session->local.error_msg;
+ }
+ else {
+ msg = apr_strerror(session->local.error, buffer, sizeof(buffer));
+ }
+ update_child_status(session, SERVER_CLOSING, msg, NULL);
+ }
+ else {
+ update_child_status(session, SERVER_CLOSING, "done", NULL);
+ }
+ }
+ else if (APR_STATUS_IS_EOF(status)
+ || APR_STATUS_IS_ECONNRESET(status)
+ || APR_STATUS_IS_ECONNABORTED(status)) {
+ h2_session_dispatch_event(session, H2_SESSION_EV_CONN_ERROR, status, NULL);
+ update_child_status(session, SERVER_CLOSING, "error", 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->c1,
+ H2_SSSN_MSG(session, "pre_close"));
+ h2_session_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_conn_ctx_twas 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;
+}