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packages/apache/nohttp2forprefork.patch

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From ab03196a879f4064f618a9a45d63c67a67f4b901 Mon Sep 17 00:00:00 2001
From: Jim Jagielski <jim@apache.org>
Date: Tue, 4 Jul 2017 12:34:15 +0000
Subject: [PATCH] Merge r1800689 from trunk:
On the trunk:
mod_http2: disable and give warning when mpm_prefork is encountered.
The server will continue to work, but HTTP/2 will no longer be negotiated.
Submitted by: icing
Reviewed by: icing, ylavic, jim
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1800774 13f79535-47bb-0310-9956-ffa450edef68
---
modules/http2/h2_conn.c | 21 +++++++-
modules/http2/h2_conn.h | 3 +-
modules/http2/h2_mplx.c | 37 +++++++-------
modules/http2/h2_mplx.h | 2 +-
modules/http2/h2_session.c | 7 +--
modules/http2/h2_stream.c | 14 +++++-
modules/http2/h2_switch.c | 8 +++
modules/http2/h2_util.c | 118 +++++++++++++++++++++------------------------
modules/http2/h2_workers.c | 7 +--
modules/http2/mod_http2.c | 12 +++++
12 files changed, 139 insertions(+), 99 deletions(-)
diff --git a/modules/http2/h2_conn.c b/modules/http2/h2_conn.c
index fcf6bad4d41..e2502c2f167 100644
--- a/modules/http2/h2_conn.c
+++ b/modules/http2/h2_conn.c
@@ -47,6 +47,7 @@ static struct h2_workers *workers;
static h2_mpm_type_t mpm_type = H2_MPM_UNKNOWN;
static module *mpm_module;
static int async_mpm;
+static int mpm_supported = 1;
static apr_socket_t *dummy_socket;
static void check_modules(int force)
@@ -76,11 +77,18 @@ static void check_modules(int force)
else if (!strcmp("prefork.c", m->name)) {
mpm_type = H2_MPM_PREFORK;
mpm_module = m;
+ /* While http2 can work really well on prefork, it collides
+ * today's use case for prefork: runnning single-thread app engines
+ * like php. If we restrict h2_workers to 1 per process, php will
+ * work fine, but browser will be limited to 1 active request at a
+ * time. */
+ mpm_supported = 0;
break;
}
else if (!strcmp("simple_api.c", m->name)) {
mpm_type = H2_MPM_SIMPLE;
mpm_module = m;
+ mpm_supported = 0;
break;
}
else if (!strcmp("mpm_winnt.c", m->name)) {
@@ -107,7 +115,6 @@ apr_status_t h2_conn_child_init(apr_pool_t *pool, server_rec *s)
int idle_secs = 0;
check_modules(1);
-
ap_mpm_query(AP_MPMQ_MAX_THREADS, &max_threads_per_child);
status = ap_mpm_query(AP_MPMQ_IS_ASYNC, &async_mpm);
@@ -157,6 +164,18 @@ h2_mpm_type_t h2_conn_mpm_type(void)
return mpm_type;
}
+const char *h2_conn_mpm_name(void)
+{
+ check_modules(0);
+ return mpm_module? mpm_module->name : "unknown";
+}
+
+int h2_mpm_supported(void)
+{
+ check_modules(0);
+ return mpm_supported;
+}
+
static module *h2_conn_mpm_module(void)
{
check_modules(0);
diff --git a/modules/http2/h2_conn.h b/modules/http2/h2_conn.h
index 79948644ae8..7111a6cd69c 100644
--- a/modules/http2/h2_conn.h
+++ b/modules/http2/h2_conn.h
@@ -64,7 +64,8 @@ typedef enum {
/* Returns the type of MPM module detected */
h2_mpm_type_t h2_conn_mpm_type(void);
-
+const char *h2_conn_mpm_name(void);
+int h2_mpm_supported(void);
conn_rec *h2_slave_create(conn_rec *master, int slave_id, apr_pool_t *parent);
void h2_slave_destroy(conn_rec *slave);
diff --git a/modules/http2/h2_mplx.c b/modules/http2/h2_mplx.c
index b73bd0d5bfd..214d84ed1f9 100644
--- a/modules/http2/h2_mplx.c
+++ b/modules/http2/h2_mplx.c
@@ -481,9 +481,6 @@ void h2_mplx_release_and_join(h2_mplx *m, apr_thread_cond_t *wait)
H2_MPLX_LEAVE(m);
- /* 5. unregister again, now that our workers are done */
- h2_workers_unregister(m->workers, m);
-
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, m->c,
"h2_mplx(%ld): released", m->id);
}
@@ -662,7 +659,7 @@ apr_status_t h2_mplx_reprioritize(h2_mplx *m, h2_stream_pri_cmp *cmp, void *ctx)
static void register_if_needed(h2_mplx *m)
{
- if (!m->is_registered && !h2_iq_empty(m->q)) {
+ if (!m->aborted && !m->is_registered && !h2_iq_empty(m->q)) {
apr_status_t status = h2_workers_register(m->workers, m);
if (status == APR_SUCCESS) {
m->is_registered = 1;
@@ -755,25 +752,27 @@ static h2_task *next_stream_task(h2_mplx *m)
return NULL;
}
-h2_task *h2_mplx_pop_task(h2_mplx *m, int *has_more)
+apr_status_t h2_mplx_pop_task(h2_mplx *m, h2_task **ptask)
{
- h2_task *task = NULL;
+ apr_status_t rv = APR_EOF;
- H2_MPLX_ENTER_ALWAYS(m);
-
- *has_more = 0;
- if (!m->aborted) {
- task = next_stream_task(m);
- if (task != NULL && !h2_iq_empty(m->q)) {
- *has_more = 1;
- }
- else {
- m->is_registered = 0; /* h2_workers will discard this mplx */
- }
+ *ptask = NULL;
+ if (APR_SUCCESS != (rv = apr_thread_mutex_lock(m->lock))) {
+ return rv;
+ }
+
+ if (m->aborted) {
+ rv = APR_EOF;
+ }
+ else {
+ *ptask = next_stream_task(m);
+ rv = (*ptask != NULL && !h2_iq_empty(m->q))? APR_EAGAIN : APR_SUCCESS;
+ }
+ if (APR_EAGAIN != rv) {
+ m->is_registered = 0; /* h2_workers will discard this mplx */
}
-
H2_MPLX_LEAVE(m);
- return task;
+ return rv;
}
static void task_done(h2_mplx *m, h2_task *task, h2_req_engine *ngn)
diff --git a/modules/http2/h2_mplx.h b/modules/http2/h2_mplx.h
index 61b1b99aba7..d56c65289c2 100644
--- a/modules/http2/h2_mplx.h
+++ b/modules/http2/h2_mplx.h
@@ -124,7 +124,7 @@ h2_mplx *h2_mplx_create(conn_rec *c, apr_pool_t *master,
*/
void h2_mplx_release_and_join(h2_mplx *m, struct apr_thread_cond_t *wait);
-struct h2_task *h2_mplx_pop_task(h2_mplx *mplx, int *has_more);
+apr_status_t h2_mplx_pop_task(h2_mplx *m, struct h2_task **ptask);
void h2_mplx_task_done(h2_mplx *m, struct h2_task *task, struct h2_task **ptask);
diff --git a/modules/http2/h2_session.c b/modules/http2/h2_session.c
index bc24bb41cdb..da85d7053fd 100644
--- a/modules/http2/h2_session.c
+++ b/modules/http2/h2_session.c
@@ -326,6 +326,7 @@ static int on_frame_recv_cb(nghttp2_session *ng2s,
{
h2_session *session = (h2_session *)userp;
h2_stream *stream;
+ apr_status_t rv = APR_SUCCESS;
if (APLOGcdebug(session->c)) {
char buffer[256];
@@ -346,7 +347,7 @@ static int on_frame_recv_cb(nghttp2_session *ng2s,
* trailers */
stream = h2_session_stream_get(session, frame->hd.stream_id);
if (stream) {
- h2_stream_recv_frame(stream, NGHTTP2_HEADERS, frame->hd.flags);
+ rv = h2_stream_recv_frame(stream, NGHTTP2_HEADERS, frame->hd.flags);
}
break;
case NGHTTP2_DATA:
@@ -356,7 +357,7 @@ static int on_frame_recv_cb(nghttp2_session *ng2s,
H2_STRM_LOG(APLOGNO(02923), stream,
"DATA, len=%ld, flags=%d"),
(long)frame->hd.length, frame->hd.flags);
- h2_stream_recv_frame(stream, NGHTTP2_DATA, frame->hd.flags);
+ rv = h2_stream_recv_frame(stream, NGHTTP2_DATA, frame->hd.flags);
}
break;
case NGHTTP2_PRIORITY:
@@ -411,7 +412,7 @@ static int on_frame_recv_cb(nghttp2_session *ng2s,
}
break;
}
- return 0;
+ return (APR_SUCCESS == rv)? 0 : NGHTTP2_ERR_PROTO;
}
static int h2_session_continue_data(h2_session *session) {
diff --git a/modules/http2/h2_stream.c b/modules/http2/h2_stream.c
index 4cd2132207e..925f3d6d81d 100644
--- a/modules/http2/h2_stream.c
+++ b/modules/http2/h2_stream.c
@@ -444,7 +444,13 @@ apr_status_t h2_stream_recv_frame(h2_stream *stream, int ftype, int flags)
else {
/* request HEADER */
ap_assert(stream->request == NULL);
- ap_assert(stream->rtmp != 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);
if (status != APR_SUCCESS) {
return status;
@@ -739,9 +745,13 @@ apr_status_t h2_stream_add_header(h2_stream *stream,
status = h2_request_add_header(stream->rtmp, stream->pool,
name, nlen, value, vlen);
}
- else {
+ 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);
diff --git a/modules/http2/h2_switch.c b/modules/http2/h2_switch.c
index 8a8d56e59ef..5b1247ec700 100644
--- a/modules/http2/h2_switch.c
+++ b/modules/http2/h2_switch.c
@@ -55,6 +55,10 @@ static int h2_protocol_propose(conn_rec *c, request_rec *r,
const char **protos = is_tls? h2_tls_protos : h2_clear_protos;
(void)s;
+ if (!h2_mpm_supported()) {
+ return DECLINED;
+ }
+
if (strcmp(AP_PROTOCOL_HTTP1, ap_get_protocol(c))) {
/* We do not know how to switch from anything else but http/1.1.
*/
@@ -127,6 +131,10 @@ static int h2_protocol_switch(conn_rec *c, request_rec *r, server_rec *s,
const char **p = protos;
(void)s;
+ if (!h2_mpm_supported()) {
+ return DECLINED;
+ }
+
while (*p) {
if (!strcmp(*p, protocol)) {
found = 1;
diff --git a/modules/http2/h2_util.c b/modules/http2/h2_util.c
index 01b506ac854..04a9311424e 100644
--- a/modules/http2/h2_util.c
+++ b/modules/http2/h2_util.c
@@ -695,16 +695,47 @@ int h2_fifo_count(h2_fifo *fifo)
static apr_status_t check_not_empty(h2_fifo *fifo, int block)
{
- if (fifo->count == 0) {
+ while (fifo->count == 0) {
if (!block) {
return APR_EAGAIN;
}
- while (fifo->count == 0) {
- if (fifo->aborted) {
- return APR_EOF;
+ if (fifo->aborted) {
+ return APR_EOF;
+ }
+ apr_thread_cond_wait(fifo->not_empty, fifo->lock);
+ }
+ return APR_SUCCESS;
+}
+
+static apr_status_t fifo_push_int(h2_fifo *fifo, void *elem, int block)
+{
+ if (fifo->aborted) {
+ return APR_EOF;
+ }
+
+ if (fifo->set && index_of(fifo, elem) >= 0) {
+ /* set mode, elem already member */
+ return APR_EEXIST;
+ }
+ else if (fifo->count == fifo->nelems) {
+ if (block) {
+ while (fifo->count == fifo->nelems) {
+ if (fifo->aborted) {
+ return APR_EOF;
+ }
+ apr_thread_cond_wait(fifo->not_full, fifo->lock);
}
- apr_thread_cond_wait(fifo->not_empty, fifo->lock);
}
+ else {
+ return APR_EAGAIN;
+ }
+ }
+
+ ap_assert(fifo->count < fifo->nelems);
+ fifo->elems[nth_index(fifo, fifo->count)] = elem;
+ ++fifo->count;
+ if (fifo->count == 1) {
+ apr_thread_cond_broadcast(fifo->not_empty);
}
return APR_SUCCESS;
}
@@ -718,33 +749,7 @@ static apr_status_t fifo_push(h2_fifo *fifo, void *elem, int block)
}
if ((rv = apr_thread_mutex_lock(fifo->lock)) == APR_SUCCESS) {
- if (fifo->set && index_of(fifo, elem) >= 0) {
- /* set mode, elem already member */
- apr_thread_mutex_unlock(fifo->lock);
- return APR_EEXIST;
- }
- else if (fifo->count == fifo->nelems) {
- if (block) {
- while (fifo->count == fifo->nelems) {
- if (fifo->aborted) {
- apr_thread_mutex_unlock(fifo->lock);
- return APR_EOF;
- }
- apr_thread_cond_wait(fifo->not_full, fifo->lock);
- }
- }
- else {
- apr_thread_mutex_unlock(fifo->lock);
- return APR_EAGAIN;
- }
- }
-
- ap_assert(fifo->count < fifo->nelems);
- fifo->elems[nth_index(fifo, fifo->count)] = elem;
- ++fifo->count;
- if (fifo->count == 1) {
- apr_thread_cond_broadcast(fifo->not_empty);
- }
+ rv = fifo_push_int(fifo, elem, block);
apr_thread_mutex_unlock(fifo->lock);
}
return rv;
@@ -760,12 +765,15 @@ apr_status_t h2_fifo_try_push(h2_fifo *fifo, void *elem)
return fifo_push(fifo, elem, 0);
}
-static void *pull_head(h2_fifo *fifo)
+static apr_status_t pull_head(h2_fifo *fifo, void **pelem, int block)
{
- void *elem;
+ apr_status_t rv;
- ap_assert(fifo->count > 0);
- elem = fifo->elems[fifo->head];
+ if ((rv = check_not_empty(fifo, block)) != APR_SUCCESS) {
+ *pelem = NULL;
+ return rv;
+ }
+ *pelem = fifo->elems[fifo->head];
--fifo->count;
if (fifo->count > 0) {
fifo->head = nth_index(fifo, 1);
@@ -773,7 +781,7 @@ static void *pull_head(h2_fifo *fifo)
apr_thread_cond_broadcast(fifo->not_full);
}
}
- return elem;
+ return APR_SUCCESS;
}
static apr_status_t fifo_pull(h2_fifo *fifo, void **pelem, int block)
@@ -785,15 +793,7 @@ static apr_status_t fifo_pull(h2_fifo *fifo, void **pelem, int block)
}
if ((rv = apr_thread_mutex_lock(fifo->lock)) == APR_SUCCESS) {
- if ((rv = check_not_empty(fifo, block)) != APR_SUCCESS) {
- apr_thread_mutex_unlock(fifo->lock);
- *pelem = NULL;
- return rv;
- }
-
- ap_assert(fifo->count > 0);
- *pelem = pull_head(fifo);
-
+ rv = pull_head(fifo, pelem, block);
apr_thread_mutex_unlock(fifo->lock);
}
return rv;
@@ -818,25 +818,17 @@ static apr_status_t fifo_peek(h2_fifo *fifo, h2_fifo_peek_fn *fn, void *ctx, int
return APR_EOF;
}
- if ((rv = apr_thread_mutex_lock(fifo->lock)) == APR_SUCCESS) {
- if ((rv = check_not_empty(fifo, block)) != APR_SUCCESS) {
- apr_thread_mutex_unlock(fifo->lock);
- return rv;
+ if (APR_SUCCESS == (rv = apr_thread_mutex_lock(fifo->lock))) {
+ if (APR_SUCCESS == (rv = pull_head(fifo, &elem, block))) {
+ switch (fn(elem, ctx)) {
+ case H2_FIFO_OP_PULL:
+ break;
+ case H2_FIFO_OP_REPUSH:
+ rv = fifo_push_int(fifo, elem, block);
+ break;
+ }
}
-
- ap_assert(fifo->count > 0);
- elem = pull_head(fifo);
-
apr_thread_mutex_unlock(fifo->lock);
-
- switch (fn(elem, ctx)) {
- case H2_FIFO_OP_PULL:
- break;
- case H2_FIFO_OP_REPUSH:
- return h2_fifo_push(fifo, elem);
- break;
- }
-
}
return rv;
}
diff --git a/modules/http2/h2_workers.c b/modules/http2/h2_workers.c
index 0bbb65223f7..5abddd4a1d5 100644
--- a/modules/http2/h2_workers.c
+++ b/modules/http2/h2_workers.c
@@ -150,15 +150,16 @@ static void cleanup_zombies(h2_workers *workers)
static apr_status_t slot_pull_task(h2_slot *slot, h2_mplx *m)
{
- int has_more;
- slot->task = h2_mplx_pop_task(m, &has_more);
+ apr_status_t rv;
+
+ rv = h2_mplx_pop_task(m, &slot->task);
if (slot->task) {
/* Ok, we got something to give back to the worker for execution.
* If we still have idle workers, we let the worker be sticky,
* e.g. making it poll the task's h2_mplx instance for more work
* before asking back here. */
slot->sticks = slot->workers->max_workers;
- return has_more? APR_EAGAIN : APR_SUCCESS;
+ return rv;
}
slot->sticks = 0;
return APR_EOF;
diff --git a/modules/http2/mod_http2.c b/modules/http2/mod_http2.c
index ea399c91a28..420e74c3363 100644
--- a/modules/http2/mod_http2.c
+++ b/modules/http2/mod_http2.c
@@ -65,6 +65,7 @@ typedef struct {
} features;
static features myfeats;
+static int mpm_warned;
/* The module initialization. Called once as apache hook, before any multi
* processing (threaded or not) happens. It is typically at least called twice,
@@ -141,6 +142,17 @@ static int h2_post_config(apr_pool_t *p, apr_pool_t *plog,
break;
}
+ if (!h2_mpm_supported() && !mpm_warned) {
+ mpm_warned = 1;
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(10034)
+ "The mpm module (%s) is not supported by mod_http2. The mpm determines "
+ "how things are processed in your server. HTTP/2 has more demands in "
+ "this regard and the currently selected mpm will just not do. "
+ "This is an advisory warning. Your server will continue to work, but "
+ "the HTTP/2 protocol will be inactive.",
+ h2_conn_mpm_name());
+ }
+
status = h2_h2_init(p, s);
if (status == APR_SUCCESS) {
status = h2_switch_init(p, s);
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