1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
|
/* 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 <apr_strings.h>
#include <ap_mpm.h>
#include <ap_mmn.h>
#include <httpd.h>
#include <http_core.h>
#include <http_config.h>
#include <http_log.h>
#include <http_connection.h>
#include <http_protocol.h>
#include <http_request.h>
#include <mpm_common.h>
#include "h2_private.h"
#include "h2.h"
#include "h2_config.h"
#include "h2_ctx.h"
#include "h2_filter.h"
#include "h2_mplx.h"
#include "h2_session.h"
#include "h2_stream.h"
#include "h2_h2.h"
#include "h2_task.h"
#include "h2_workers.h"
#include "h2_conn.h"
#include "h2_version.h"
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)
{
static int checked = 0;
int i;
if (force || !checked) {
for (i = 0; ap_loaded_modules[i]; ++i) {
module *m = ap_loaded_modules[i];
if (!strcmp("event.c", m->name)) {
mpm_type = H2_MPM_EVENT;
mpm_module = m;
break;
}
else if (!strcmp("motorz.c", m->name)) {
mpm_type = H2_MPM_MOTORZ;
mpm_module = m;
break;
}
else if (!strcmp("mpm_netware.c", m->name)) {
mpm_type = H2_MPM_NETWARE;
mpm_module = m;
break;
}
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)) {
mpm_type = H2_MPM_WINNT;
mpm_module = m;
break;
}
else if (!strcmp("worker.c", m->name)) {
mpm_type = H2_MPM_WORKER;
mpm_module = m;
break;
}
}
checked = 1;
}
}
apr_status_t h2_conn_child_init(apr_pool_t *pool, server_rec *s)
{
apr_status_t status = APR_SUCCESS;
int minw, maxw;
int max_threads_per_child = 0;
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);
if (status != APR_SUCCESS) {
/* some MPMs do not implemnent this */
async_mpm = 0;
status = APR_SUCCESS;
}
h2_config_init(pool);
h2_get_num_workers(s, &minw, &maxw);
idle_secs = h2_config_sgeti(s, H2_CONF_MAX_WORKER_IDLE_SECS);
ap_log_error(APLOG_MARK, APLOG_TRACE3, 0, s,
"h2_workers: min=%d max=%d, mthrpchild=%d, idle_secs=%d",
minw, maxw, max_threads_per_child, idle_secs);
workers = h2_workers_create(s, pool, minw, maxw, idle_secs);
ap_register_input_filter("H2_IN", h2_filter_core_input,
NULL, AP_FTYPE_CONNECTION);
status = h2_mplx_child_init(pool, s);
if (status == APR_SUCCESS) {
status = apr_socket_create(&dummy_socket, APR_INET, SOCK_STREAM,
APR_PROTO_TCP, pool);
}
return status;
}
h2_mpm_type_t h2_conn_mpm_type(void)
{
check_modules(0);
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);
return mpm_module;
}
apr_status_t h2_conn_setup(conn_rec *c, request_rec *r, server_rec *s)
{
h2_session *session;
h2_ctx *ctx;
apr_status_t status;
if (!workers) {
ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(02911)
"workers not initialized");
return APR_EGENERAL;
}
if (APR_SUCCESS == (status = h2_session_create(&session, c, r, s, workers))) {
ctx = h2_ctx_get(c, 1);
h2_ctx_session_set(ctx, session);
}
return status;
}
apr_status_t h2_conn_run(conn_rec *c)
{
apr_status_t status;
int mpm_state = 0;
h2_session *session = h2_ctx_get_session(c);
ap_assert(session);
do {
if (c->cs) {
c->cs->sense = CONN_SENSE_DEFAULT;
c->cs->state = CONN_STATE_HANDLER;
}
status = h2_session_process(session, async_mpm);
if (APR_STATUS_IS_EOF(status)) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, c,
H2_SSSN_LOG(APLOGNO(03045), session,
"process, closing conn"));
c->keepalive = AP_CONN_CLOSE;
}
else {
c->keepalive = AP_CONN_KEEPALIVE;
}
if (ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state)) {
break;
}
} while (!async_mpm
&& c->keepalive == AP_CONN_KEEPALIVE
&& mpm_state != AP_MPMQ_STOPPING);
if (c->cs) {
switch (session->state) {
case H2_SESSION_ST_INIT:
case H2_SESSION_ST_IDLE:
case H2_SESSION_ST_BUSY:
case H2_SESSION_ST_WAIT:
c->cs->state = CONN_STATE_WRITE_COMPLETION;
if (c->cs && (session->open_streams || !session->remote.emitted_count)) {
/* let the MPM know that we are not done and want
* the Timeout behaviour instead of a KeepAliveTimeout
* See PR 63534.
*/
c->cs->sense = CONN_SENSE_WANT_READ;
}
break;
case H2_SESSION_ST_CLEANUP:
case H2_SESSION_ST_DONE:
default:
c->cs->state = CONN_STATE_LINGER;
break;
}
}
return APR_SUCCESS;
}
apr_status_t h2_conn_pre_close(struct h2_ctx *ctx, conn_rec *c)
{
h2_session *session = h2_ctx_get_session(c);
(void)c;
if (session) {
apr_status_t status = h2_session_pre_close(session, async_mpm);
return (status == APR_SUCCESS)? DONE : status;
}
return DONE;
}
/* APR callback invoked if allocation fails. */
static int abort_on_oom(int retcode)
{
ap_abort_on_oom();
return retcode; /* unreachable, hopefully. */
}
conn_rec *h2_slave_create(conn_rec *master, int slave_id, apr_pool_t *parent)
{
apr_allocator_t *allocator;
apr_status_t status;
apr_pool_t *pool;
conn_rec *c;
void *cfg;
module *mpm;
ap_assert(master);
ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, master,
"h2_stream(%ld-%d): create slave", master->id, slave_id);
/* We create a pool with its own allocator to be used for
* processing a request. This is the only way to have the processing
* independant of its parent pool in the sense that it can work in
* another thread. Also, the new allocator needs its own mutex to
* synchronize sub-pools.
*/
apr_allocator_create(&allocator);
apr_allocator_max_free_set(allocator, ap_max_mem_free);
status = apr_pool_create_ex(&pool, parent, NULL, allocator);
if (status != APR_SUCCESS) {
ap_log_cerror(APLOG_MARK, APLOG_ERR, status, master,
APLOGNO(10004) "h2_session(%ld-%d): create slave pool",
master->id, slave_id);
return NULL;
}
apr_allocator_owner_set(allocator, pool);
apr_pool_abort_set(abort_on_oom, pool);
apr_pool_tag(pool, "h2_slave_conn");
c = (conn_rec *) apr_palloc(pool, sizeof(conn_rec));
if (c == NULL) {
ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_ENOMEM, master,
APLOGNO(02913) "h2_session(%ld-%d): create slave",
master->id, slave_id);
apr_pool_destroy(pool);
return NULL;
}
memcpy(c, master, sizeof(conn_rec));
c->master = master;
c->pool = pool;
c->conn_config = ap_create_conn_config(pool);
c->notes = apr_table_make(pool, 5);
c->input_filters = NULL;
c->output_filters = NULL;
c->keepalives = 0;
#if AP_MODULE_MAGIC_AT_LEAST(20180903, 1)
c->filter_conn_ctx = NULL;
#endif
c->bucket_alloc = apr_bucket_alloc_create(pool);
#if !AP_MODULE_MAGIC_AT_LEAST(20180720, 1)
c->data_in_input_filters = 0;
c->data_in_output_filters = 0;
#endif
/* prevent mpm_event from making wrong assumptions about this connection,
* like e.g. using its socket for an async read check. */
c->clogging_input_filters = 1;
c->log = NULL;
c->log_id = apr_psprintf(pool, "%ld-%d",
master->id, slave_id);
c->aborted = 0;
/* We cannot install the master connection socket on the slaves, as
* modules mess with timeouts/blocking of the socket, with
* unwanted side effects to the master connection processing.
* Fortunately, since we never use the slave socket, we can just install
* a single, process-wide dummy and everyone is happy.
*/
ap_set_module_config(c->conn_config, &core_module, dummy_socket);
/* TODO: these should be unique to this thread */
c->sbh = master->sbh;
/* TODO: not all mpm modules have learned about slave connections yet.
* copy their config from master to slave.
*/
if ((mpm = h2_conn_mpm_module()) != NULL) {
cfg = ap_get_module_config(master->conn_config, mpm);
ap_set_module_config(c->conn_config, mpm, cfg);
}
ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, c,
"h2_slave(%s): created", c->log_id);
return c;
}
void h2_slave_destroy(conn_rec *slave)
{
ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, slave,
"h2_slave(%s): destroy", slave->log_id);
slave->sbh = NULL;
apr_pool_destroy(slave->pool);
}
apr_status_t h2_slave_run_pre_connection(conn_rec *slave, apr_socket_t *csd)
{
if (slave->keepalives == 0) {
/* Simulate that we had already a request on this connection. Some
* hooks trigger special behaviour when keepalives is 0.
* (Not necessarily in pre_connection, but later. Set it here, so it
* is in place.) */
slave->keepalives = 1;
/* We signal that this connection will be closed after the request.
* Which is true in that sense that we throw away all traffic data
* on this slave connection after each requests. Although we might
* reuse internal structures like memory pools.
* The wanted effect of this is that httpd does not try to clean up
* any dangling data on this connection when a request is done. Which
* is unneccessary on a h2 stream.
*/
slave->keepalive = AP_CONN_CLOSE;
return ap_run_pre_connection(slave, csd);
}
ap_assert(slave->output_filters);
return APR_SUCCESS;
}
|