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haproxy/include/common/h2.h
Willy Tarreau 174b06a572 MINOR: h2: detect presence of CONNECT and/or content-length 
We'll need this in order to support uploading chunks. The h2 to h1
converter checks for the presence of the content-length header field
as well as the CONNECT method and returns these information to the
caller. The caller indicates whether or not a body is detected for
the message (presence of END_STREAM or not). No transfer-encoding
header is emitted yet.
2018-04-26 10:15:14 +02:00

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/*
* include/common/h2.h
* This file contains types and macros used for the HTTP/2 protocol
*
* Copyright (C) 2000-2017 Willy Tarreau - w@1wt.eu
* Copyright (C) 2017 HAProxy Technologies
*
* 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 _COMMON_H2_H
#define _COMMON_H2_H
#include <common/config.h>
#include <common/http-hdr.h>
#include <common/ist.h>
/* indexes of most important pseudo headers can be simplified to an almost
* linear array by dividing the index by 2 for all values from 1 to 9, and
* caping to 4 for values up to 14 ; thus it fits in a single 24-bit array
* shifted by 3 times the index value/2, or a 32-bit array shifted by 4x.
* Don't change these values, they are assumed by hpack_idx_to_phdr(). There
* is an entry for the Host header field which is not a pseudo-header but
* needs to be tracked as we should only use :authority if it's absent.
*/
enum {
H2_PHDR_IDX_NONE = 0,
H2_PHDR_IDX_AUTH = 1, /* :authority = 1 */
H2_PHDR_IDX_METH = 2, /* :method = 2..3 */
H2_PHDR_IDX_PATH = 3, /* :path = 4..5 */
H2_PHDR_IDX_SCHM = 4, /* :scheme = 6..7 */
H2_PHDR_IDX_STAT = 5, /* :status = 8..14 */
H2_PHDR_IDX_HOST = 6, /* Host, never returned, just a place-holder */
H2_PHDR_NUM_ENTRIES /* must be last */
};
/* bit fields indicating the pseudo-headers found. It also covers the HOST
* header field as well as any non-pseudo-header field (NONE).
*/
enum {
H2_PHDR_FND_NONE = 1 << H2_PHDR_IDX_NONE, /* found a regular header */
H2_PHDR_FND_AUTH = 1 << H2_PHDR_IDX_AUTH,
H2_PHDR_FND_METH = 1 << H2_PHDR_IDX_METH,
H2_PHDR_FND_PATH = 1 << H2_PHDR_IDX_PATH,
H2_PHDR_FND_SCHM = 1 << H2_PHDR_IDX_SCHM,
H2_PHDR_FND_STAT = 1 << H2_PHDR_IDX_STAT,
H2_PHDR_FND_HOST = 1 << H2_PHDR_IDX_HOST,
};
/* frame types, from the standard */
enum h2_ft {
H2_FT_DATA = 0x00, // RFC7540 #6.1
H2_FT_HEADERS = 0x01, // RFC7540 #6.2
H2_FT_PRIORITY = 0x02, // RFC7540 #6.3
H2_FT_RST_STREAM = 0x03, // RFC7540 #6.4
H2_FT_SETTINGS = 0x04, // RFC7540 #6.5
H2_FT_PUSH_PROMISE = 0x05, // RFC7540 #6.6
H2_FT_PING = 0x06, // RFC7540 #6.7
H2_FT_GOAWAY = 0x07, // RFC7540 #6.8
H2_FT_WINDOW_UPDATE = 0x08, // RFC7540 #6.9
H2_FT_CONTINUATION = 0x09, // RFC7540 #6.10
H2_FT_ENTRIES /* must be last */
} __attribute__((packed));
/* flags defined for each frame type */
// RFC7540 #6.1
#define H2_F_DATA_END_STREAM 0x01
#define H2_F_DATA_PADDED 0x08
// RFC7540 #6.2
#define H2_F_HEADERS_END_STREAM 0x01
#define H2_F_HEADERS_END_HEADERS 0x04
#define H2_F_HEADERS_PADDED 0x08
#define H2_F_HEADERS_PRIORITY 0x20
// RFC7540 #6.3 : PRIORITY defines no flags
// RFC7540 #6.4 : RST_STREAM defines no flags
// RFC7540 #6.5
#define H2_F_SETTINGS_ACK 0x01
// RFC7540 #6.6
#define H2_F_PUSH_PROMISE_END_HEADERS 0x04
#define H2_F_PUSH_PROMISE_PADDED 0x08
// RFC7540 #6.7
#define H2_F_PING_ACK 0x01
// RFC7540 #6.8 : GOAWAY defines no flags
// RFC7540 #6.9 : WINDOW_UPDATE defines no flags
/* HTTP/2 error codes - RFC7540 #7 */
enum h2_err {
H2_ERR_NO_ERROR = 0x0,
H2_ERR_PROTOCOL_ERROR = 0x1,
H2_ERR_INTERNAL_ERROR = 0x2,
H2_ERR_FLOW_CONTROL_ERROR = 0x3,
H2_ERR_SETTINGS_TIMEOUT = 0x4,
H2_ERR_STREAM_CLOSED = 0x5,
H2_ERR_FRAME_SIZE_ERROR = 0x6,
H2_ERR_REFUSED_STREAM = 0x7,
H2_ERR_CANCEL = 0x8,
H2_ERR_COMPRESSION_ERROR = 0x9,
H2_ERR_CONNECT_ERROR = 0xa,
H2_ERR_ENHANCE_YOUR_CALM = 0xb,
H2_ERR_INADEQUATE_SECURITY = 0xc,
H2_ERR_HTTP_1_1_REQUIRED = 0xd,
} __attribute__((packed));
// RFC7540 #11.3 : Settings Registry
#define H2_SETTINGS_HEADER_TABLE_SIZE 0x0001
#define H2_SETTINGS_ENABLE_PUSH 0x0002
#define H2_SETTINGS_MAX_CONCURRENT_STREAMS 0x0003
#define H2_SETTINGS_INITIAL_WINDOW_SIZE 0x0004
#define H2_SETTINGS_MAX_FRAME_SIZE 0x0005
#define H2_SETTINGS_MAX_HEADER_LIST_SIZE 0x0006
/* some protocol constants */
// PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n
#define H2_CONN_PREFACE \
"\x50\x52\x49\x20\x2a\x20\x48\x54" \
"\x54\x50\x2f\x32\x2e\x30\x0d\x0a" \
"\x0d\x0a\x53\x4d\x0d\x0a\x0d\x0a"
/* some flags related to protocol parsing */
#define H2_MSGF_BODY 0x0001 // a body is present
#define H2_MSGF_BODY_CL 0x0002 // content-length is present
#define H2_MSGF_BODY_TUNNEL 0x0004 // a tunnel is in use (CONNECT)
/* various protocol processing functions */
int h2_make_h1_request(struct http_hdr *list, char *out, int osize, unsigned int *msgf);
/*
* Some helpful debugging functions.
*/
/* returns the frame type as a string */
static inline const char *h2_ft_str(int type)
{
switch (type) {
case H2_FT_DATA : return "DATA";
case H2_FT_HEADERS : return "HEADERS";
case H2_FT_PRIORITY : return "PRIORITY";
case H2_FT_RST_STREAM : return "RST_STREAM";
case H2_FT_SETTINGS : return "SETTINGS";
case H2_FT_PUSH_PROMISE : return "PUSH_PROMISE";
case H2_FT_PING : return "PING";
case H2_FT_GOAWAY : return "GOAWAY";
case H2_FT_WINDOW_UPDATE : return "WINDOW_UPDATE";
default : return "_UNKNOWN_";
}
}
/* returns the pseudo-header <str> corresponds to among H2_PHDR_IDX_*, 0 if not a
* pseudo-header, or -1 if not a valid pseudo-header.
*/
static inline int h2_str_to_phdr(const struct ist str)
{
if (*str.ptr == ':') {
if (isteq(str, ist(":path"))) return H2_PHDR_IDX_PATH;
else if (isteq(str, ist(":method"))) return H2_PHDR_IDX_METH;
else if (isteq(str, ist(":scheme"))) return H2_PHDR_IDX_SCHM;
else if (isteq(str, ist(":status"))) return H2_PHDR_IDX_STAT;
else if (isteq(str, ist(":authority"))) return H2_PHDR_IDX_AUTH;
/* all other names starting with ':' */
return -1;
}
/* not a pseudo header */
return 0;
}
/* returns the pseudo-header name <num> as a string, or ":UNKNOWN" if unknown */
static inline const char *h2_phdr_to_str(int phdr)
{
switch (phdr) {
case H2_PHDR_IDX_NONE: return ":NONE";
case H2_PHDR_IDX_AUTH: return ":authority";
case H2_PHDR_IDX_METH: return ":method";
case H2_PHDR_IDX_PATH: return ":path";
case H2_PHDR_IDX_SCHM: return ":scheme";
case H2_PHDR_IDX_STAT: return ":status";
case H2_PHDR_IDX_HOST: return "Host";
default: return ":UNKNOWN";
}
}
#endif /* _COMMON_H2_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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