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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.
*/
#ifndef __mod_h2__h2_h2__
#define __mod_h2__h2_h2__
/**
* List of ALPN protocol identifiers that we suport in cleartext
* negotiations. NULL terminated.
*/
extern const char *h2_clear_protos[];
/**
* List of ALPN protocol identifiers that we support in TLS encrypted
* negotiations. NULL terminated.
*/
extern const char *h2_tls_protos[];
/**
* The magic PRIamble of RFC 7540 that is always sent when starting
* a h2 communication.
*/
extern const char *H2_MAGIC_TOKEN;
#define H2_ERR_NO_ERROR (0x00)
#define H2_ERR_PROTOCOL_ERROR (0x01)
#define H2_ERR_INTERNAL_ERROR (0x02)
#define H2_ERR_FLOW_CONTROL_ERROR (0x03)
#define H2_ERR_SETTINGS_TIMEOUT (0x04)
#define H2_ERR_STREAM_CLOSED (0x05)
#define H2_ERR_FRAME_SIZE_ERROR (0x06)
#define H2_ERR_REFUSED_STREAM (0x07)
#define H2_ERR_CANCEL (0x08)
#define H2_ERR_COMPRESSION_ERROR (0x09)
#define H2_ERR_CONNECT_ERROR (0x0a)
#define H2_ERR_ENHANCE_YOUR_CALM (0x0b)
#define H2_ERR_INADEQUATE_SECURITY (0x0c)
#define H2_ERR_HTTP_1_1_REQUIRED (0x0d)
/* Maximum number of padding bytes in a frame, rfc7540 */
#define H2_MAX_PADLEN 256
/* Initial default window size, RFC 7540 ch. 6.5.2 */
#define H2_INITIAL_WINDOW_SIZE ((64*1024)-1)
#define H2_HTTP_2XX(a) ((a) >= 200 && (a) < 300)
#define H2_STREAM_CLIENT_INITIATED(id) (id&0x01)
typedef enum {
H2_DEPENDANT_AFTER,
H2_DEPENDANT_INTERLEAVED,
H2_DEPENDANT_BEFORE,
} h2_dependency;
typedef struct h2_priority {
h2_dependency dependency;
int weight;
} h2_priority;
/**
* Provide a user readable description of the HTTP/2 error code-
* @param h2_error http/2 error code, as in rfc 7540, ch. 7
* @return textual description of code or that it is unknown.
*/
const char *h2_h2_err_description(unsigned int h2_error);
/*
* One time, post config intialization.
*/
apr_status_t h2_h2_init(apr_pool_t *pool, server_rec *s);
/* Is the connection a TLS connection?
*/
int h2_h2_is_tls(conn_rec *c);
/* Register apache hooks for h2 protocol
*/
void h2_h2_register_hooks(void);
/**
* Check if the given connection fulfills the requirements as configured.
* @param c the connection
* @param require_all != 0 iff any missing connection properties make
* the test fail. For example, a cipher might not have been selected while
* the handshake is still ongoing.
* @return != 0 iff connection requirements are met
*/
int h2_is_acceptable_connection(conn_rec *c, int require_all);
/**
* Check if the "direct" HTTP/2 mode of protocol handling is enabled
* for the given connection.
* @param c the connection to check
* @return != 0 iff direct mode is enabled
*/
int h2_allows_h2_direct(conn_rec *c);
/**
* Check if the "Upgrade" HTTP/1.1 mode of protocol switching is enabled
* for the given connection.
* @param c the connection to check
* @return != 0 iff Upgrade switching is enabled
*/
int h2_allows_h2_upgrade(conn_rec *c);
#endif /* defined(__mod_h2__h2_h2__) */
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