/usr/include/h2o/http2_internal.h is in libh2o-dev-common 2.2.4+dfsg-1build1.
This file is owned by root:root, with mode 0o644.
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* Copyright (c) 2014,2015 DeNA Co., Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef h2o__http2__internal_h
#define h2o__http2__internal_h
#include <assert.h>
#include <stdint.h>
#include "khash.h"
#include "h2o/cache.h"
#include "h2o/http2_casper.h"
#include "h2o/cache_digests.h"
#include "h2o/http2_scheduler.h"
typedef struct st_h2o_http2_conn_t h2o_http2_conn_t;
typedef struct st_h2o_http2_stream_t h2o_http2_stream_t;
/* connection flow control window + alpha */
#define H2O_HTTP2_DEFAULT_OUTBUF_SIZE 81920
/* hpack */
#define H2O_HTTP2_ENCODE_INT_MAX_LENGTH 5
typedef struct st_h2o_hpack_header_table_t {
/* ring buffer */
struct st_h2o_hpack_header_table_entry_t *entries;
size_t num_entries, entry_capacity, entry_start_index;
/* size and capacities are 32+name_len+value_len (as defined by hpack spec.) */
size_t hpack_size;
size_t hpack_capacity; /* the value set by SETTINGS_HEADER_TABLE_SIZE _and_ dynamic table size update */
size_t hpack_max_capacity; /* the value set by SETTINGS_HEADER_TABLE_SIZE */
} h2o_hpack_header_table_t;
typedef struct st_h2o_hpack_header_table_entry_t {
h2o_iovec_t *name;
h2o_iovec_t *value;
const char *err_desc; /* the recorded soft error description */
} h2o_hpack_header_table_entry_t;
#define H2O_HPACK_PARSE_HEADERS_METHOD_EXISTS 1
#define H2O_HPACK_PARSE_HEADERS_SCHEME_EXISTS 2
#define H2O_HPACK_PARSE_HEADERS_PATH_EXISTS 4
#define H2O_HPACK_PARSE_HEADERS_AUTHORITY_EXISTS 8
void h2o_hpack_dispose_header_table(h2o_hpack_header_table_t *header_table);
int h2o_hpack_parse_headers(h2o_req_t *req, h2o_hpack_header_table_t *header_table, const uint8_t *src, size_t len,
int *pseudo_header_exists_map, size_t *content_length, h2o_cache_digests_t **digests,
const char **err_desc);
size_t h2o_hpack_encode_string(uint8_t *dst, const char *s, size_t len);
void h2o_hpack_flatten_request(h2o_buffer_t **buf, h2o_hpack_header_table_t *header_table, uint32_t stream_id,
size_t max_frame_size, h2o_req_t *req, uint32_t parent_stream_id);
void h2o_hpack_flatten_response(h2o_buffer_t **buf, h2o_hpack_header_table_t *header_table, uint32_t stream_id,
size_t max_frame_size, h2o_res_t *res, h2o_timestamp_t *ts, const h2o_iovec_t *server_name,
size_t content_length);
static h2o_hpack_header_table_entry_t *h2o_hpack_header_table_get(h2o_hpack_header_table_t *table, size_t index);
/* frames */
#define H2O_HTTP2_FRAME_HEADER_SIZE 9
#define H2O_HTTP2_FRAME_TYPE_DATA 0
#define H2O_HTTP2_FRAME_TYPE_HEADERS 1
#define H2O_HTTP2_FRAME_TYPE_PRIORITY 2
#define H2O_HTTP2_FRAME_TYPE_RST_STREAM 3
#define H2O_HTTP2_FRAME_TYPE_SETTINGS 4
#define H2O_HTTP2_FRAME_TYPE_PUSH_PROMISE 5
#define H2O_HTTP2_FRAME_TYPE_PING 6
#define H2O_HTTP2_FRAME_TYPE_GOAWAY 7
#define H2O_HTTP2_FRAME_TYPE_WINDOW_UPDATE 8
#define H2O_HTTP2_FRAME_TYPE_CONTINUATION 9
#define H2O_HTTP2_FRAME_FLAG_END_STREAM 0x1
#define H2O_HTTP2_FRAME_FLAG_ACK 0x1
#define H2O_HTTP2_FRAME_FLAG_END_HEADERS 0x4
#define H2O_HTTP2_FRAME_FLAG_PADDED 0x8
#define H2O_HTTP2_FRAME_FLAG_PRIORITY 0x20
typedef struct st_h2o_http2_frame_t {
uint32_t length;
uint8_t type;
uint8_t flags;
uint32_t stream_id;
const uint8_t *payload;
} h2o_http2_frame_t;
typedef struct st_h2o_http2_data_payload_t {
const uint8_t *data;
size_t length;
} h2o_http2_data_payload_t;
typedef struct st_h2o_http2_headers_payload_t {
h2o_http2_priority_t priority;
const uint8_t *headers;
size_t headers_len;
} h2o_http2_headers_payload_t;
typedef struct st_h2o_http2_rst_stream_payload_t {
uint32_t error_code;
} h2o_http2_rst_stream_payload_t;
typedef struct st_h2o_http2_ping_payload_t {
uint8_t data[8];
} h2o_http2_ping_payload_t;
typedef struct st_h2o_http2_goaway_payload_t {
uint32_t last_stream_id;
uint32_t error_code;
h2o_iovec_t debug_data;
} h2o_http2_goaway_payload_t;
typedef struct st_h2o_http2_window_update_payload_t {
uint32_t window_size_increment;
} h2o_http2_window_update_payload_t;
typedef struct st_h2o_http2_window_t {
ssize_t _avail;
} h2o_http2_window_t;
typedef enum enum_h2o_http2_stream_state_t {
H2O_HTTP2_STREAM_STATE_IDLE,
H2O_HTTP2_STREAM_STATE_RECV_HEADERS,
H2O_HTTP2_STREAM_STATE_RECV_BODY,
H2O_HTTP2_STREAM_STATE_REQ_PENDING,
H2O_HTTP2_STREAM_STATE_SEND_HEADERS,
H2O_HTTP2_STREAM_STATE_SEND_BODY,
H2O_HTTP2_STREAM_STATE_SEND_BODY_IS_FINAL,
H2O_HTTP2_STREAM_STATE_END_STREAM
} h2o_http2_stream_state_t;
typedef struct st_h2o_http2_conn_num_streams_t {
uint32_t open;
uint32_t half_closed;
uint32_t send_body;
} h2o_http2_conn_num_streams_t;
struct st_h2o_http2_stream_t {
uint32_t stream_id;
h2o_ostream_t _ostr_final;
h2o_http2_stream_state_t state;
h2o_http2_window_t output_window;
h2o_http2_window_t input_window;
h2o_http2_priority_t received_priority;
h2o_buffer_t *_req_body; /* NULL unless request body IS expected */
size_t _expected_content_length; /* SIZE_MAX if unknown */
H2O_VECTOR(h2o_iovec_t) _data;
h2o_ostream_pull_cb _pull_cb;
h2o_http2_conn_num_streams_t *_num_streams_slot; /* points http2_conn_t::num_streams::* in which the stream is counted */
h2o_cache_digests_t *cache_digests;
union {
struct {
uint32_t parent_stream_id;
unsigned promise_sent : 1;
} push;
struct {
unsigned casper_is_ready : 1;
} pull;
};
/* references governed by connection.c for handling various things */
struct {
h2o_linklist_t link;
h2o_http2_scheduler_openref_t scheduler;
} _refs;
h2o_send_state_t send_state; /* state of the ostream, only used in push mode */
/* placed at last since it is large and has it's own ctor */
h2o_req_t req;
};
KHASH_MAP_INIT_INT64(h2o_http2_stream_t, h2o_http2_stream_t *)
typedef enum enum_h2o_http2_conn_state_t {
H2O_HTTP2_CONN_STATE_OPEN, /* accepting new connections */
H2O_HTTP2_CONN_STATE_HALF_CLOSED, /* no more accepting new streams */
H2O_HTTP2_CONN_STATE_IS_CLOSING /* nothing should be sent */
} h2o_http2_conn_state_t;
struct st_h2o_http2_conn_t {
h2o_conn_t super;
h2o_socket_t *sock;
/* settings */
h2o_http2_settings_t peer_settings;
/* streams */
khash_t(h2o_http2_stream_t) * streams;
struct {
uint32_t max_open;
uint32_t max_processed;
} pull_stream_ids;
struct {
uint32_t max_open;
} push_stream_ids;
struct {
h2o_http2_conn_num_streams_t priority;
h2o_http2_conn_num_streams_t pull;
h2o_http2_conn_num_streams_t push;
} num_streams;
/* internal */
h2o_http2_scheduler_node_t scheduler;
h2o_http2_conn_state_t state;
h2o_linklist_t _conns; /* linklist to h2o_context_t::http2._conns */
ssize_t (*_read_expect)(h2o_http2_conn_t *conn, const uint8_t *src, size_t len, const char **err_desc);
h2o_buffer_t *_http1_req_input; /* contains data referred to by original request via HTTP/1.1 */
h2o_hpack_header_table_t _input_header_table;
h2o_http2_window_t _input_window;
h2o_hpack_header_table_t _output_header_table;
h2o_linklist_t _pending_reqs; /* list of h2o_http2_stream_t that contain pending requests */
h2o_timeout_entry_t _timeout_entry;
h2o_buffer_t *_headers_unparsed; /* for temporary storing HEADERS|CONTINUATION frames without END_HEADERS flag set */
struct {
h2o_buffer_t *buf;
h2o_buffer_t *buf_in_flight;
h2o_linklist_t streams_to_proceed;
h2o_timeout_entry_t timeout_entry;
h2o_http2_window_t window;
} _write;
h2o_cache_t *push_memo;
h2o_http2_casper_t *casper;
};
int h2o_http2_update_peer_settings(h2o_http2_settings_t *settings, const uint8_t *src, size_t len, const char **err_desc);
/* frames */
uint8_t *h2o_http2_encode_frame_header(uint8_t *dst, size_t length, uint8_t type, uint8_t flags, int32_t stream_id);
#define h2o_http2_encode_rst_stream_frame(buf, stream_id, errnum) \
h2o_http2__encode_rst_stream_frame(buf, stream_id, (H2O_BUILD_ASSERT((errnum) > 0), errnum))
void h2o_http2__encode_rst_stream_frame(h2o_buffer_t **buf, uint32_t stream_id, int errnum);
void h2o_http2_encode_ping_frame(h2o_buffer_t **buf, int is_ack, const uint8_t *data);
void h2o_http2_encode_goaway_frame(h2o_buffer_t **buf, uint32_t last_stream_id, int errnum, h2o_iovec_t additional_data);
void h2o_http2_encode_window_update_frame(h2o_buffer_t **buf, uint32_t stream_id, int32_t window_size_increment);
ssize_t h2o_http2_decode_frame(h2o_http2_frame_t *frame, const uint8_t *src, size_t len, const h2o_http2_settings_t *host_settings,
const char **err_desc);
int h2o_http2_decode_data_payload(h2o_http2_data_payload_t *payload, const h2o_http2_frame_t *frame, const char **err_desc);
int h2o_http2_decode_headers_payload(h2o_http2_headers_payload_t *payload, const h2o_http2_frame_t *frame, const char **err_desc);
int h2o_http2_decode_priority_payload(h2o_http2_priority_t *payload, const h2o_http2_frame_t *frame, const char **err_desc);
int h2o_http2_decode_rst_stream_payload(h2o_http2_rst_stream_payload_t *payload, const h2o_http2_frame_t *frame,
const char **err_desc);
int h2o_http2_decode_ping_payload(h2o_http2_ping_payload_t *payload, const h2o_http2_frame_t *frame, const char **err_desc);
int h2o_http2_decode_goaway_payload(h2o_http2_goaway_payload_t *payload, const h2o_http2_frame_t *frame, const char **err_desc);
int h2o_http2_decode_window_update_payload(h2o_http2_window_update_payload_t *paylaod, const h2o_http2_frame_t *frame,
const char **err_desc, int *err_is_stream_level);
/* connection */
void h2o_http2_conn_register_stream(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream);
void h2o_http2_conn_unregister_stream(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream);
static h2o_http2_stream_t *h2o_http2_conn_get_stream(h2o_http2_conn_t *conn, uint32_t stream_id);
void h2o_http2_conn_push_path(h2o_http2_conn_t *conn, h2o_iovec_t path, h2o_http2_stream_t *src_stream);
void h2o_http2_conn_request_write(h2o_http2_conn_t *conn);
void h2o_http2_conn_register_for_proceed_callback(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream);
static ssize_t h2o_http2_conn_get_buffer_window(h2o_http2_conn_t *conn);
static void h2o_http2_conn_init_casper(h2o_http2_conn_t *conn, unsigned capacity_bits);
/* stream */
static int h2o_http2_stream_is_push(uint32_t stream_id);
h2o_http2_stream_t *h2o_http2_stream_open(h2o_http2_conn_t *conn, uint32_t stream_id, h2o_req_t *src_req,
const h2o_http2_priority_t *received_priority);
static void h2o_http2_stream_update_open_slot(h2o_http2_stream_t *stream, h2o_http2_conn_num_streams_t *slot);
static void h2o_http2_stream_set_state(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream, h2o_http2_stream_state_t new_state);
static void h2o_http2_stream_prepare_for_request(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream);
void h2o_http2_stream_close(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream);
void h2o_http2_stream_reset(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream);
void h2o_http2_stream_send_pending_data(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream);
static int h2o_http2_stream_has_pending_data(h2o_http2_stream_t *stream);
void h2o_http2_stream_proceed(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream);
static void h2o_http2_stream_send_push_promise(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream);
/* misc */
static void h2o_http2_window_init(h2o_http2_window_t *window, const h2o_http2_settings_t *peer_settings);
static int h2o_http2_window_update(h2o_http2_window_t *window, ssize_t delta);
static ssize_t h2o_http2_window_get_window(h2o_http2_window_t *window);
static void h2o_http2_window_consume_window(h2o_http2_window_t *window, size_t bytes);
static uint16_t h2o_http2_decode16u(const uint8_t *src);
static uint32_t h2o_http2_decode24u(const uint8_t *src);
static uint32_t h2o_http2_decode32u(const uint8_t *src);
static uint8_t *h2o_http2_encode24u(uint8_t *dst, uint32_t value);
static uint8_t *h2o_http2_encode32u(uint8_t *dst, uint32_t value);
h2o_http2_debug_state_t *h2o_http2_get_debug_state(h2o_req_t *req, int hpack_enabled);
/* inline definitions */
inline void h2o_http2_window_init(h2o_http2_window_t *window, const h2o_http2_settings_t *peer_settings)
{
window->_avail = peer_settings->initial_window_size;
}
inline int h2o_http2_window_update(h2o_http2_window_t *window, ssize_t delta)
{
size_t v = window->_avail + delta;
if (v > INT32_MAX)
return -1;
window->_avail = v;
return 0;
}
inline ssize_t h2o_http2_window_get_window(h2o_http2_window_t *window)
{
return window->_avail;
}
inline void h2o_http2_window_consume_window(h2o_http2_window_t *window, size_t bytes)
{
window->_avail -= bytes;
}
inline h2o_http2_stream_t *h2o_http2_conn_get_stream(h2o_http2_conn_t *conn, uint32_t stream_id)
{
khiter_t iter = kh_get(h2o_http2_stream_t, conn->streams, stream_id);
if (iter != kh_end(conn->streams))
return kh_val(conn->streams, iter);
return NULL;
}
inline int h2o_http2_stream_is_push(uint32_t stream_id)
{
return stream_id % 2 == 0;
}
inline ssize_t h2o_http2_conn_get_buffer_window(h2o_http2_conn_t *conn)
{
ssize_t ret, winsz;
size_t capacity, cwnd_left;
capacity = conn->_write.buf->capacity;
if ((cwnd_left = h2o_socket_prepare_for_latency_optimized_write(
conn->sock, &conn->super.ctx->globalconf->http2.latency_optimization)) < capacity) {
capacity = cwnd_left;
if (capacity < conn->_write.buf->size)
return 0;
}
ret = capacity - conn->_write.buf->size;
if (ret < H2O_HTTP2_FRAME_HEADER_SIZE)
return 0;
ret -= H2O_HTTP2_FRAME_HEADER_SIZE;
winsz = h2o_http2_window_get_window(&conn->_write.window);
if (winsz < ret)
ret = winsz;
return ret;
}
inline void h2o_http2_conn_init_casper(h2o_http2_conn_t *conn, unsigned capacity_bits)
{
assert(conn->casper == NULL);
conn->casper = h2o_http2_casper_create(capacity_bits, 6);
}
inline void h2o_http2_stream_update_open_slot(h2o_http2_stream_t *stream, h2o_http2_conn_num_streams_t *slot)
{
--stream->_num_streams_slot->open;
++slot->open;
stream->_num_streams_slot = slot;
}
inline void h2o_http2_stream_set_state(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream, h2o_http2_stream_state_t new_state)
{
switch (new_state) {
case H2O_HTTP2_STREAM_STATE_IDLE:
assert(!"FIXME");
break;
case H2O_HTTP2_STREAM_STATE_RECV_HEADERS:
assert(stream->state == H2O_HTTP2_STREAM_STATE_IDLE);
if (h2o_http2_stream_is_push(stream->stream_id))
h2o_http2_stream_update_open_slot(stream, &conn->num_streams.push);
else
h2o_http2_stream_update_open_slot(stream, &conn->num_streams.pull);
stream->state = new_state;
stream->req.timestamps.request_begin_at = *h2o_get_timestamp(conn->super.ctx, NULL, NULL);
break;
case H2O_HTTP2_STREAM_STATE_RECV_BODY:
stream->state = new_state;
stream->req.timestamps.request_body_begin_at = *h2o_get_timestamp(conn->super.ctx, NULL, NULL);
break;
case H2O_HTTP2_STREAM_STATE_REQ_PENDING:
stream->state = new_state;
break;
case H2O_HTTP2_STREAM_STATE_SEND_HEADERS:
assert(stream->state == H2O_HTTP2_STREAM_STATE_REQ_PENDING);
++stream->_num_streams_slot->half_closed;
stream->state = new_state;
break;
case H2O_HTTP2_STREAM_STATE_SEND_BODY:
stream->state = new_state;
++stream->_num_streams_slot->send_body;
stream->req.timestamps.response_start_at = *h2o_get_timestamp(conn->super.ctx, NULL, NULL);
break;
case H2O_HTTP2_STREAM_STATE_SEND_BODY_IS_FINAL:
assert(stream->state == H2O_HTTP2_STREAM_STATE_SEND_BODY);
stream->state = new_state;
break;
case H2O_HTTP2_STREAM_STATE_END_STREAM:
switch (stream->state) {
case H2O_HTTP2_STREAM_STATE_IDLE:
case H2O_HTTP2_STREAM_STATE_RECV_BODY:
case H2O_HTTP2_STREAM_STATE_RECV_HEADERS:
break;
case H2O_HTTP2_STREAM_STATE_REQ_PENDING:
break;
case H2O_HTTP2_STREAM_STATE_SEND_HEADERS:
--stream->_num_streams_slot->half_closed;
break;
case H2O_HTTP2_STREAM_STATE_SEND_BODY:
case H2O_HTTP2_STREAM_STATE_SEND_BODY_IS_FINAL:
--stream->_num_streams_slot->half_closed;
--stream->_num_streams_slot->send_body;
break;
case H2O_HTTP2_STREAM_STATE_END_STREAM:
assert(!"FIXME");
break;
}
stream->state = new_state;
stream->req.timestamps.response_end_at = *h2o_get_timestamp(conn->super.ctx, NULL, NULL);
--stream->_num_streams_slot->open;
stream->_num_streams_slot = NULL;
break;
}
}
inline void h2o_http2_stream_prepare_for_request(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream)
{
assert(h2o_http2_scheduler_is_open(&stream->_refs.scheduler));
/* adjust max-open */
uint32_t *max_open =
h2o_http2_stream_is_push(stream->stream_id) ? &conn->push_stream_ids.max_open : &conn->pull_stream_ids.max_open;
if (*max_open < stream->stream_id)
*max_open = stream->stream_id;
h2o_http2_stream_set_state(conn, stream, H2O_HTTP2_STREAM_STATE_RECV_HEADERS);
h2o_http2_window_init(&stream->output_window, &conn->peer_settings);
}
inline int h2o_http2_stream_has_pending_data(h2o_http2_stream_t *stream)
{
return stream->_data.size != 0;
}
inline void h2o_http2_stream_send_push_promise(h2o_http2_conn_t *conn, h2o_http2_stream_t *stream)
{
assert(!stream->push.promise_sent);
h2o_hpack_flatten_request(&conn->_write.buf, &conn->_output_header_table, stream->stream_id, conn->peer_settings.max_frame_size,
&stream->req, stream->push.parent_stream_id);
stream->push.promise_sent = 1;
}
inline uint16_t h2o_http2_decode16u(const uint8_t *src)
{
return (uint16_t)src[0] << 8 | src[1];
}
inline uint32_t h2o_http2_decode24u(const uint8_t *src)
{
return (uint32_t)src[0] << 16 | (uint32_t)src[1] << 8 | src[2];
}
inline uint32_t h2o_http2_decode32u(const uint8_t *src)
{
return (uint32_t)src[0] << 24 | (uint32_t)src[1] << 16 | (uint32_t)src[2] << 8 | src[3];
}
inline uint8_t *h2o_http2_encode24u(uint8_t *dst, uint32_t value)
{
*dst++ = value >> 16;
*dst++ = value >> 8;
*dst++ = value;
return dst;
}
inline uint8_t *h2o_http2_encode32u(uint8_t *dst, uint32_t value)
{
*dst++ = value >> 24;
*dst++ = value >> 16;
*dst++ = value >> 8;
*dst++ = value;
return dst;
}
inline h2o_hpack_header_table_entry_t *h2o_hpack_header_table_get(h2o_hpack_header_table_t *table, size_t index)
{
size_t entry_index = (index + table->entry_start_index) % table->entry_capacity;
struct st_h2o_hpack_header_table_entry_t *entry = table->entries + entry_index;
assert(entry->name != NULL);
return entry;
}
#endif
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