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-rw-r--r--modules/http2/mod_http2.c349
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diff --git a/modules/http2/mod_http2.c b/modules/http2/mod_http2.c
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+/* 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 <apr_optional.h>
+#include <apr_optional_hooks.h>
+#include <apr_strings.h>
+#include <apr_time.h>
+#include <apr_want.h>
+
+#include <httpd.h>
+#include <http_protocol.h>
+#include <http_request.h>
+#include <http_log.h>
+#include <mpm_common.h>
+
+#include "mod_http2.h"
+
+#include <nghttp2/nghttp2.h>
+#include "h2_stream.h"
+#include "h2_c1.h"
+#include "h2_c2.h"
+#include "h2_session.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_switch.h"
+#include "h2_version.h"
+#include "h2_bucket_beam.h"
+
+
+static void h2_hooks(apr_pool_t *pool);
+
+AP_DECLARE_MODULE(http2) = {
+ STANDARD20_MODULE_STUFF,
+ h2_config_create_dir, /* func to create per dir config */
+ h2_config_merge_dir, /* func to merge per dir config */
+ h2_config_create_svr, /* func to create per server config */
+ h2_config_merge_svr, /* func to merge per server config */
+ h2_cmds, /* command handlers */
+ h2_hooks,
+#if defined(AP_MODULE_FLAG_NONE)
+ AP_MODULE_FLAG_ALWAYS_MERGE
+#endif
+};
+
+static int h2_h2_fixups(request_rec *r);
+
+typedef struct {
+ unsigned int change_prio : 1;
+ unsigned int sha256 : 1;
+ unsigned int inv_headers : 1;
+ unsigned int dyn_windows : 1;
+} 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,
+ * see
+ * http://wiki.apache.org/httpd/ModuleLife
+ * Since the first run is just a "practise" run, we want to initialize for real
+ * only on the second try. This defeats the purpose of the first dry run a bit,
+ * since apache wants to verify that a new configuration actually will work.
+ * So if we have trouble with the configuration, this will only be detected
+ * when the server has already switched.
+ * On the other hand, when we initialize lib nghttp2, all possible crazy things
+ * might happen and this might even eat threads. So, better init on the real
+ * invocation, for now at least.
+ */
+static int h2_post_config(apr_pool_t *p, apr_pool_t *plog,
+ apr_pool_t *ptemp, server_rec *s)
+{
+ void *data = NULL;
+ const char *mod_h2_init_key = "mod_http2_init_counter";
+ nghttp2_info *ngh2;
+ apr_status_t status;
+
+ (void)plog;(void)ptemp;
+#ifdef H2_NG2_CHANGE_PRIO
+ myfeats.change_prio = 1;
+#endif
+#ifdef H2_OPENSSL
+ myfeats.sha256 = 1;
+#endif
+#ifdef H2_NG2_INVALID_HEADER_CB
+ myfeats.inv_headers = 1;
+#endif
+#ifdef H2_NG2_LOCAL_WIN_SIZE
+ myfeats.dyn_windows = 1;
+#endif
+
+ apr_pool_userdata_get(&data, mod_h2_init_key, s->process->pool);
+ if ( data == NULL ) {
+ ap_log_error( APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(03089)
+ "initializing post config dry run");
+ apr_pool_userdata_set((const void *)1, mod_h2_init_key,
+ apr_pool_cleanup_null, s->process->pool);
+ return APR_SUCCESS;
+ }
+
+ ngh2 = nghttp2_version(0);
+ ap_log_error( APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(03090)
+ "mod_http2 (v%s, feats=%s%s%s%s, nghttp2 %s), initializing...",
+ MOD_HTTP2_VERSION,
+ myfeats.change_prio? "CHPRIO" : "",
+ myfeats.sha256? "+SHA256" : "",
+ myfeats.inv_headers? "+INVHD" : "",
+ myfeats.dyn_windows? "+DWINS" : "",
+ ngh2? ngh2->version_str : "unknown");
+
+ 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_protocol_init(p, s);
+ if (status == APR_SUCCESS) {
+ status = h2_switch_init(p, s);
+ }
+
+ return status;
+}
+
+static char *http2_var_lookup(apr_pool_t *, server_rec *,
+ conn_rec *, request_rec *, char *name);
+static int http2_is_h2(conn_rec *);
+
+static void http2_get_num_workers(server_rec *s, int *minw, int *maxw)
+{
+ apr_time_t tdummy;
+
+ h2_get_workers_config(s, minw, maxw, &tdummy);
+}
+
+/* Runs once per created child process. Perform any process
+ * related initionalization here.
+ */
+static void h2_child_init(apr_pool_t *pchild, server_rec *s)
+{
+ apr_status_t rv;
+
+ /* Set up our connection processing */
+ rv = h2_c1_child_init(pchild, s);
+ if (APR_SUCCESS == rv) {
+ rv = h2_c2_child_init(pchild, s);
+ }
+ if (APR_SUCCESS != rv) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rv, s,
+ APLOGNO(02949) "initializing connection handling");
+ }
+}
+
+/* Install this module into the apache2 infrastructure.
+ */
+static void h2_hooks(apr_pool_t *pool)
+{
+ static const char *const mod_ssl[] = { "mod_ssl.c", NULL};
+
+ APR_REGISTER_OPTIONAL_FN(http2_is_h2);
+ APR_REGISTER_OPTIONAL_FN(http2_var_lookup);
+ APR_REGISTER_OPTIONAL_FN(http2_get_num_workers);
+
+ ap_log_perror(APLOG_MARK, APLOG_TRACE1, 0, pool, "installing hooks");
+
+ /* Run once after configuration is set, but before mpm children initialize.
+ */
+ ap_hook_post_config(h2_post_config, mod_ssl, NULL, APR_HOOK_MIDDLE);
+
+ /* Run once after a child process has been created.
+ */
+ ap_hook_child_init(h2_child_init, NULL, NULL, APR_HOOK_MIDDLE);
+#if AP_MODULE_MAGIC_AT_LEAST(20120211, 110)
+ ap_hook_child_stopping(h2_c1_child_stopping, NULL, NULL, APR_HOOK_MIDDLE);
+#endif
+
+ h2_c1_register_hooks();
+ h2_switch_register_hooks();
+ h2_c2_register_hooks();
+
+ /* Setup subprocess env for certain variables
+ */
+ ap_hook_fixups(h2_h2_fixups, NULL,NULL, APR_HOOK_MIDDLE);
+}
+
+static const char *val_HTTP2(apr_pool_t *p, server_rec *s,
+ conn_rec *c, request_rec *r, h2_conn_ctx_t *ctx)
+{
+ return ctx? "on" : "off";
+}
+
+static const char *val_H2_PUSH(apr_pool_t *p, server_rec *s,
+ conn_rec *c, request_rec *r,
+ h2_conn_ctx_t *conn_ctx)
+{
+ if (conn_ctx) {
+ if (r) {
+ if (conn_ctx->stream_id) {
+ const h2_stream *stream = h2_mplx_c2_stream_get(conn_ctx->mplx, conn_ctx->stream_id);
+ if (stream && stream->push_policy != H2_PUSH_NONE) {
+ return "on";
+ }
+ }
+ }
+ else if (c && h2_session_push_enabled(conn_ctx->session)) {
+ return "on";
+ }
+ }
+ else if (s) {
+ if (h2_config_geti(r, s, H2_CONF_PUSH)) {
+ return "on";
+ }
+ }
+ return "off";
+}
+
+static const char *val_H2_PUSHED(apr_pool_t *p, server_rec *s,
+ conn_rec *c, request_rec *r,
+ h2_conn_ctx_t *conn_ctx)
+{
+ if (conn_ctx) {
+ if (conn_ctx->stream_id && !H2_STREAM_CLIENT_INITIATED(conn_ctx->stream_id)) {
+ return "PUSHED";
+ }
+ }
+ return "";
+}
+
+static const char *val_H2_PUSHED_ON(apr_pool_t *p, server_rec *s,
+ conn_rec *c, request_rec *r,
+ h2_conn_ctx_t *conn_ctx)
+{
+ if (conn_ctx) {
+ if (conn_ctx->stream_id && !H2_STREAM_CLIENT_INITIATED(conn_ctx->stream_id)) {
+ const h2_stream *stream = h2_mplx_c2_stream_get(conn_ctx->mplx, conn_ctx->stream_id);
+ if (stream) {
+ return apr_itoa(p, stream->initiated_on);
+ }
+ }
+ }
+ return "";
+}
+
+static const char *val_H2_STREAM_TAG(apr_pool_t *p, server_rec *s,
+ conn_rec *c, request_rec *r, h2_conn_ctx_t *ctx)
+{
+ if (c) {
+ h2_conn_ctx_t *conn_ctx = h2_conn_ctx_get(c);
+ if (conn_ctx) {
+ return conn_ctx->stream_id == 0? conn_ctx->id
+ : apr_psprintf(p, "%s-%d", conn_ctx->id, conn_ctx->stream_id);
+ }
+ }
+ return "";
+}
+
+static const char *val_H2_STREAM_ID(apr_pool_t *p, server_rec *s,
+ conn_rec *c, request_rec *r, h2_conn_ctx_t *ctx)
+{
+ const char *cp = val_H2_STREAM_TAG(p, s, c, r, ctx);
+ if (cp && (cp = ap_strrchr_c(cp, '-'))) {
+ return ++cp;
+ }
+ return NULL;
+}
+
+typedef const char *h2_var_lookup(apr_pool_t *p, server_rec *s,
+ conn_rec *c, request_rec *r, h2_conn_ctx_t *ctx);
+typedef struct h2_var_def {
+ const char *name;
+ h2_var_lookup *lookup;
+ unsigned int subprocess : 1; /* should be set in r->subprocess_env */
+} h2_var_def;
+
+static h2_var_def H2_VARS[] = {
+ { "HTTP2", val_HTTP2, 1 },
+ { "H2PUSH", val_H2_PUSH, 1 },
+ { "H2_PUSH", val_H2_PUSH, 1 },
+ { "H2_PUSHED", val_H2_PUSHED, 1 },
+ { "H2_PUSHED_ON", val_H2_PUSHED_ON, 1 },
+ { "H2_STREAM_ID", val_H2_STREAM_ID, 1 },
+ { "H2_STREAM_TAG", val_H2_STREAM_TAG, 1 },
+};
+
+#ifndef H2_ALEN
+#define H2_ALEN(a) (sizeof(a)/sizeof((a)[0]))
+#endif
+
+
+static int http2_is_h2(conn_rec *c)
+{
+ return h2_conn_ctx_get(c->master? c->master : c) != NULL;
+}
+
+static char *http2_var_lookup(apr_pool_t *p, server_rec *s,
+ conn_rec *c, request_rec *r, char *name)
+{
+ unsigned int i;
+ /* If the # of vars grow, we need to put definitions in a hash */
+ for (i = 0; i < H2_ALEN(H2_VARS); ++i) {
+ h2_var_def *vdef = &H2_VARS[i];
+ if (!strcmp(vdef->name, name)) {
+ h2_conn_ctx_t *ctx = (r? h2_conn_ctx_get(c) :
+ h2_conn_ctx_get(c->master? c->master : c));
+ return (char *)vdef->lookup(p, s, c, r, ctx);
+ }
+ }
+ return (char*)"";
+}
+
+static int h2_h2_fixups(request_rec *r)
+{
+ if (r->connection->master) {
+ h2_conn_ctx_t *ctx = h2_conn_ctx_get(r->connection);
+ unsigned int i;
+
+ for (i = 0; ctx && i < H2_ALEN(H2_VARS); ++i) {
+ h2_var_def *vdef = &H2_VARS[i];
+ if (vdef->subprocess) {
+ apr_table_setn(r->subprocess_env, vdef->name,
+ vdef->lookup(r->pool, r->server, r->connection,
+ r, ctx));
+ }
+ }
+ }
+ return DECLINED;
+}
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