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/* Copyright 2015 greenbytes GmbH (https://www.greenbytes.de)
*
* Licensed 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 <apr_optional.h>
#include <apr_optional_hooks.h>
#include <httpd.h>
#include <http_core.h>
#include <http_config.h>
#include <http_connection.h>
#include <http_protocol.h>
#include <http_log.h>
#include "h2_private.h"
#include "h2_config.h"
#include "h2_ctx.h"
#include "h2_conn.h"
#include "h2_h2.h"
#include "h2_switch.h"
/*******************************************************************************
* Once per lifetime init, retrieve optional functions
*/
apr_status_t h2_switch_init(apr_pool_t *pool, server_rec *s)
{
(void)pool;
ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, s, "h2_switch init");
return APR_SUCCESS;
}
static int h2_protocol_propose(conn_rec *c, request_rec *r,
server_rec *s,
const apr_array_header_t *offers,
apr_array_header_t *proposals)
{
int proposed = 0;
int is_tls = h2_h2_is_tls(c);
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.
*/
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(03083)
"protocol switch: current proto != http/1.1, declined");
return DECLINED;
}
if (!h2_is_acceptable_connection(c, 0)) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(03084)
"protocol propose: connection requirements not met");
return DECLINED;
}
if (r) {
/* So far, this indicates an HTTP/1 Upgrade header initiated
* protocol switch. For that, the HTTP2-Settings header needs
* to be present and valid for the connection.
*/
const char *p;
if (!h2_allows_h2_upgrade(c)) {
return DECLINED;
}
p = apr_table_get(r->headers_in, "HTTP2-Settings");
if (!p) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03085)
"upgrade without HTTP2-Settings declined");
return DECLINED;
}
p = apr_table_get(r->headers_in, "Connection");
if (!ap_find_token(r->pool, p, "http2-settings")) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03086)
"upgrade without HTTP2-Settings declined");
return DECLINED;
}
/* We also allow switching only for requests that have no body.
*/
p = apr_table_get(r->headers_in, "Content-Length");
if (p && strcmp(p, "0")) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03087)
"upgrade with content-length: %s, declined", p);
return DECLINED;
}
}
while (*protos) {
/* Add all protocols we know (tls or clear) and that
* are part of the offerings (if there have been any).
*/
if (!offers || ap_array_str_contains(offers, *protos)) {
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
"proposing protocol '%s'", *protos);
APR_ARRAY_PUSH(proposals, const char*) = *protos;
proposed = 1;
}
++protos;
}
return proposed? DECLINED : OK;
}
static int h2_protocol_switch(conn_rec *c, request_rec *r, server_rec *s,
const char *protocol)
{
int found = 0;
const char **protos = h2_h2_is_tls(c)? h2_tls_protos : h2_clear_protos;
const char **p = protos;
(void)s;
if (!h2_mpm_supported()) {
return DECLINED;
}
while (*p) {
if (!strcmp(*p, protocol)) {
found = 1;
break;
}
p++;
}
if (found) {
h2_ctx *ctx = h2_ctx_get(c, 1);
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
"switching protocol to '%s'", protocol);
h2_ctx_protocol_set(ctx, protocol);
h2_ctx_server_set(ctx, s);
if (r != NULL) {
apr_status_t status;
/* Switching in the middle of a request means that
* we have to send out the response to this one in h2
* format. So we need to take over the connection
* right away.
*/
ap_remove_input_filter_byhandle(r->input_filters, "http_in");
ap_remove_input_filter_byhandle(r->input_filters, "reqtimeout");
ap_remove_output_filter_byhandle(r->output_filters, "HTTP_HEADER");
/* Ok, start an h2_conn on this one. */
h2_ctx_server_set(ctx, r->server);
status = h2_conn_setup(ctx, r->connection, r);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, status, r, APLOGNO(03088)
"session setup");
h2_ctx_clear(c);
return status;
}
h2_conn_run(ctx, c);
return DONE;
}
return DONE;
}
return DECLINED;
}
static const char *h2_protocol_get(const conn_rec *c)
{
return h2_ctx_protocol_get(c);
}
void h2_switch_register_hooks(void)
{
ap_hook_protocol_propose(h2_protocol_propose, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_protocol_switch(h2_protocol_switch, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_protocol_get(h2_protocol_get, NULL, NULL, APR_HOOK_MIDDLE);
}