# Crow: include/crow/http_parser_merged.h Source File

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http_parser_merged.h
/* merged revision: 5b951d74bd66ec9d38448e0a85b1cf8b85d97db3 */
/* updated to : e13b274770da9b82a1085dec29182acfea72e7a7 (beyond v2.9.5) */
/* commits not included:
* 091ebb87783a58b249062540bbea07de2a11e9cf
* 6132d1fefa03f769a3979355d1f5da0b8889cad2
* 7ba312397c2a6c851a4b5efe6c1603b1e1bda6ff
* d7675453a6c03180572f084e95eea0d02df39164
* dff604db203986e532e5a679bafd0e7382c6bdd9 (Might be useful to actually add [upgrade requests with a body])
* e01811e7f4894d7f0f7f4bd8492cccec6f6b4038 (related to above)
* 05525c5fde1fc562481f6ae08fa7056185325daf (also related to above)
* 350258965909f249f9c59823aac240313e0d0120 (cannot be implemented due to upgrade)
*/
// clang-format off
#pragma once
extern "C" {
#include <stddef.h>
#if defined(_WIN32) && !defined(__MINGW32__) && \
(!defined(_MSC_VER) || _MSC_VER<1600) && !defined(__WINE__)
#include <BaseTsd.h>
typedef __int8 int8_t;
typedef unsigned __int8 uint8_t;
typedef __int16 int16_t;
typedef unsigned __int16 uint16_t;
typedef __int32 int32_t;
typedef unsigned __int32 uint32_t;
typedef __int64 int64_t;
typedef unsigned __int64 uint64_t;
#elif (defined(__sun) || defined(__sun__)) && defined(__SunOS_5_9)
#include <sys/inttypes.h>
#else
#include <stdint.h>
#endif
#include <assert.h>
#include <ctype.h>
#include <string.h>
#include <limits.h>
}
#include "crow/common.h"
namespace crow
{
/* Maximium header size allowed. If the macro is not defined
* before including this header then the default is used. To
* change the maximum header size, define the macro in the build
* environment (e.g. -DHTTP_MAX_HEADER_SIZE=<value>). To remove
* the effective limit on the size of the header, define the macro
* to a very large number (e.g. -DCROW_HTTP_MAX_HEADER_SIZE=0x7fffffff)
*/
#ifndef CROW_HTTP_MAX_HEADER_SIZE
# define CROW_HTTP_MAX_HEADER_SIZE (80*1024)
#endif
typedef struct http_parser http_parser;
typedef struct http_parser_settings http_parser_settings;
/* Callbacks should return non-zero to indicate an error. The parser will
* then halt execution.
*
* The one exception is on_headers_complete. In a HTTP_RESPONSE parser
* returning '1' from on_headers_complete will tell the parser that it
* should not expect a body. This is used when receiving a response to a
* HEAD request which may contain 'Content-Length' or 'Transfer-Encoding:
* chunked' headers that indicate the presence of a body.
*
* Returning `2` from on_headers_complete will tell parser that it should not
* expect neither a body nor any futher responses on this connection. This is
* useful for handling responses to a CONNECT request which may not contain
* `Upgrade` or `Connection: upgrade` headers.
*
* http_data_cb does not return data chunks. It will be called arbitrarally
* many times for each string. E.G. you might get 10 callbacks for "on_url"
* each providing just a few characters more data.
*/
typedef int (*http_data_cb) (http_parser*, const char *at, size_t length);
typedef int (*http_cb) (http_parser*);
/* Flag values for http_parser.flags field */
enum http_connection_flags // This is basically 7 booleans placed into 1 integer. Uses 4 bytes instead of n bytes (7 currently).
{ F_CHUNKED = 1 << 0 // 00000000 00000000 00000000 00000001
, F_CONNECTION_KEEP_ALIVE = 1 << 1 // 00000000 00000000 00000000 00000010
, F_CONNECTION_CLOSE = 1 << 2 // 00000000 00000000 00000000 00000100
, F_TRAILING = 1 << 3 // 00000000 00000000 00000000 00001000
, F_UPGRADE = 1 << 4 // 00000000 00000000 00000000 00010000
, F_SKIPBODY = 1 << 5 // 00000000 00000000 00000000 00100000
, F_CONTENTLENGTH = 1 << 6 // 00000000 00000000 00000000 01000000
};
/* Map for errno-related constants
*
* The provided argument should be a macro that takes 2 arguments.
*/
#define CROW_HTTP_ERRNO_MAP(CROW_XX) \
/* No error */ \
CROW_XX(OK, "success") \
\
/* Callback-related errors */ \
CROW_XX(CB_message_begin, "the on_message_begin callback failed") \
CROW_XX(CB_method, "the on_method callback failed") \
CROW_XX(CB_url, "the \"on_url\" callback failed") \
CROW_XX(CB_header_field, "the \"on_header_field\" callback failed") \
CROW_XX(CB_header_value, "the \"on_header_value\" callback failed") \
CROW_XX(CB_headers_complete, "the \"on_headers_complete\" callback failed") \
CROW_XX(CB_body, "the \"on_body\" callback failed") \
CROW_XX(CB_message_complete, "the \"on_message_complete\" callback failed") \
CROW_XX(CB_status, "the \"on_status\" callback failed") \
\
/* Parsing-related errors */ \
CROW_XX(INVALID_EOF_STATE, "stream ended at an unexpected time") \
CROW_XX(HEADER_OVERFLOW, "too many header bytes seen; overflow detected") \
CROW_XX(CLOSED_CONNECTION, "data received after completed connection: close message") \
CROW_XX(INVALID_VERSION, "invalid HTTP version") \
CROW_XX(INVALID_STATUS, "invalid HTTP status code") \
CROW_XX(INVALID_METHOD, "invalid HTTP method") \
CROW_XX(INVALID_URL, "invalid URL") \
CROW_XX(INVALID_HOST, "invalid host") \
CROW_XX(INVALID_PORT, "invalid port") \
CROW_XX(INVALID_PATH, "invalid path") \
CROW_XX(INVALID_QUERY_STRING, "invalid query string") \
CROW_XX(INVALID_FRAGMENT, "invalid fragment") \
CROW_XX(LF_EXPECTED, "LF character expected") \
CROW_XX(INVALID_HEADER_TOKEN, "invalid character in header") \
CROW_XX(INVALID_CONTENT_LENGTH, "invalid character in content-length header") \
CROW_XX(UNEXPECTED_CONTENT_LENGTH, "unexpected content-length header") \
CROW_XX(INVALID_CHUNK_SIZE, "invalid character in chunk size header") \
CROW_XX(INVALID_CONSTANT, "invalid constant string") \
CROW_XX(INVALID_INTERNAL_STATE, "encountered unexpected internal state") \
CROW_XX(STRICT, "strict mode assertion failed") \
CROW_XX(UNKNOWN, "an unknown error occurred") \
CROW_XX(INVALID_TRANSFER_ENCODING, "request has invalid transfer-encoding") \
/* Define CHPE_* values for each errno value above */
#define CROW_HTTP_ERRNO_GEN(n, s) CHPE_##n,
enum http_errno {
CROW_HTTP_ERRNO_MAP(CROW_HTTP_ERRNO_GEN)
};
#undef CROW_HTTP_ERRNO_GEN
/* Get an http_errno value from an http_parser */
#define CROW_HTTP_PARSER_ERRNO(p) ((enum http_errno)(p)->http_errno)
struct http_parser
{
/** PRIVATE **/
unsigned int flags : 7; /* F_* values from 'flags' enum; semi-public */
unsigned int state : 8; /* enum state from http_parser.c */
unsigned int header_state : 7; /* enum header_state from http_parser.c */
unsigned int index : 5; /* index into current matcher */
unsigned int uses_transfer_encoding : 1; /* Transfer-Encoding header is present */
unsigned int allow_chunked_length : 1; /* Allow headers with both `Content-Length` and `Transfer-Encoding: chunked` set */
unsigned int lenient_http_headers : 1;
uint32_t nread; /* # bytes read in various scenarios */
uint64_t content_length; /* # bytes in body. `(uint64_t) -1` (all bits one) if no Content-Length header. */
unsigned long qs_point;
/** READ-ONLY **/
unsigned char http_major;
unsigned char http_minor;
unsigned int method : 8; /* requests only */
unsigned int http_errno : 7;
/* 1 = Upgrade header was present and the parser has exited because of that.
* 0 = No upgrade header present.
* Should be checked when http_parser_execute() returns in addition to
* error checking.
*/
unsigned int upgrade : 1;
/** PUBLIC **/
void* data; /* A pointer to get hook to the "connection" or "socket" object */
};
struct http_parser_settings
{
http_cb on_message_begin;
http_cb on_method;
http_data_cb on_url;
http_data_cb on_header_field;
http_data_cb on_header_value;
http_cb on_headers_complete;
http_data_cb on_body;
http_cb on_message_complete;
};
// SOURCE (.c) CODE
static uint32_t max_header_size = CROW_HTTP_MAX_HEADER_SIZE;
#ifndef CROW_ULLONG_MAX
# define CROW_ULLONG_MAX ((uint64_t) -1) /* 2^64-1 */
#endif
#ifndef CROW_MIN
# define CROW_MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
#ifndef CROW_ARRAY_SIZE
# define CROW_ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
#endif
#ifndef CROW_BIT_AT
# define CROW_BIT_AT(a, i) \
(!!((unsigned int) (a)[(unsigned int) (i) >> 3] & \
(1 << ((unsigned int) (i) & 7))))
#endif
#define CROW_SET_ERRNO(e) \
do { \
parser->nread = nread; \
parser->http_errno = (e); \
} while(0)
/* Run the notify callback FOR, returning ER if it fails */
#define CROW_CALLBACK_NOTIFY_(FOR, ER) \
do { \
assert(CROW_HTTP_PARSER_ERRNO(parser) == CHPE_OK); \
\
if (CROW_LIKELY(settings->on_##FOR)) { \
if (CROW_UNLIKELY(0 != settings->on_##FOR(parser))) { \
CROW_SET_ERRNO(CHPE_CB_##FOR); \
} \
\
/* We either errored above or got paused; get out */ \
if (CROW_UNLIKELY(CROW_HTTP_PARSER_ERRNO(parser) != CHPE_OK)) { \
return (ER); \
} \
} \
} while (0)
/* Run the notify callback FOR and consume the current byte */
#define CROW_CALLBACK_NOTIFY(FOR) CROW_CALLBACK_NOTIFY_(FOR, p - data + 1)
/* Run the notify callback FOR and don't consume the current byte */
#define CROW_CALLBACK_NOTIFY_NOADVANCE(FOR) CROW_CALLBACK_NOTIFY_(FOR, p - data)
/* Run data callback FOR with LEN bytes, returning ER if it fails */
#define CROW_CALLBACK_DATA_(FOR, LEN, ER) \
do { \
assert(CROW_HTTP_PARSER_ERRNO(parser) == CHPE_OK); \
\
if (FOR##_mark) { \
if (CROW_LIKELY(settings->on_##FOR)) { \
if (CROW_UNLIKELY(0 != \
settings->on_##FOR(parser, FOR##_mark, (LEN)))) { \
CROW_SET_ERRNO(CHPE_CB_##FOR); \
} \
\
/* We either errored above or got paused; get out */ \
if (CROW_UNLIKELY(CROW_HTTP_PARSER_ERRNO(parser) != CHPE_OK)) {\
return (ER); \
} \
} \
FOR##_mark = NULL; \
} \
} while (0)
/* Run the data callback FOR and consume the current byte */
#define CROW_CALLBACK_DATA(FOR) \
CROW_CALLBACK_DATA_(FOR, p - FOR##_mark, p - data + 1)
/* Run the data callback FOR and don't consume the current byte */
#define CROW_CALLBACK_DATA_NOADVANCE(FOR) \
CROW_CALLBACK_DATA_(FOR, p - FOR##_mark, p - data)
/* Set the mark FOR; non-destructive if mark is already set */
#define CROW_MARK(FOR) \
do { \
if (!FOR##_mark) { \
FOR##_mark = p; \
} \
} while (0)
/* Don't allow the total size of the HTTP headers (including the status
* line) to exceed max_header_size. This check is here to protect
* embedders against denial-of-service attacks where the attacker feeds
* us a never-ending header that the embedder keeps buffering.
*
* This check is arguably the responsibility of embedders but we're doing
* it on the embedder's behalf because most won't bother and this way we
* make the web a little safer. max_header_size is still far bigger
* than any reasonable request or response so this should never affect
* day-to-day operation.
*/
#define CROW_COUNT_HEADER_SIZE(V) \
do { \
nread += (uint32_t)(V); \
if (CROW_UNLIKELY(nread > max_header_size)) { \
CROW_SET_ERRNO(CHPE_HEADER_OVERFLOW); \
goto error; \
} \
} while (0)
#define CROW_REEXECUTE() \
goto reexecute; \
#define CROW_PROXY_CONNECTION "proxy-connection"
#define CROW_CONNECTION "connection"
#define CROW_CONTENT_LENGTH "content-length"
#define CROW_TRANSFER_ENCODING "transfer-encoding"
#define CROW_UPGRADE "upgrade"
#define CROW_CHUNKED "chunked"
#define CROW_KEEP_ALIVE "keep-alive"
#define CROW_CLOSE "close"
enum state
{
s_dead = 1 /* important that this is > 0 */
,
s_start_req
,
s_req_method,
s_req_spaces_before_url,
s_req_schema,
s_req_schema_slash,
s_req_schema_slash_slash,
s_req_server_start,
s_req_server, // }
s_req_server_with_at, // |
s_req_path, // | The parser recognizes how to switch between these states,
s_req_query_string_start, // | however it doesn't process them any differently.
s_req_query_string, // }
s_req_http_start,
s_req_http_H,
s_req_http_HT,
s_req_http_HTT,
s_req_http_HTTP,
s_req_http_I,
s_req_http_IC,
s_req_http_major,
s_req_http_dot,
s_req_http_minor,
s_req_http_end,
s_req_line_almost_done
,
s_header_field_start,
s_header_field,
s_header_value_discard_ws,
s_header_value_discard_ws_almost_done,
s_header_value_discard_lws,
s_header_value_start,
s_header_value,
s_header_value_lws
,
s_header_almost_done
,
s_chunk_size_start,
s_chunk_size,
s_chunk_parameters,
s_chunk_size_almost_done
,
s_headers_almost_done,
s_headers_done
/* Important: 's_headers_done' must be the last 'header' state. All
* states beyond this must be 'body' states. It is used for overflow
* checking. See the CROW_PARSING_HEADER() macro.
*/
,
s_chunk_data,
s_chunk_data_almost_done,
s_chunk_data_done
,
s_body_identity,
s_body_identity_eof
,
s_message_done
};
#define CROW_PARSING_HEADER(state) (state <= s_headers_done)
enum header_states
{ h_general = 0
, h_C
, h_CO
, h_CON
, h_matching_connection
, h_matching_proxy_connection
, h_matching_content_length
, h_matching_transfer_encoding
, h_matching_upgrade
, h_connection
, h_content_length
, h_content_length_num
, h_content_length_ws
, h_transfer_encoding
, h_upgrade
, h_matching_transfer_encoding_token_start
, h_matching_transfer_encoding_chunked
, h_matching_transfer_encoding_token
, h_matching_connection_keep_alive
, h_matching_connection_close
, h_transfer_encoding_chunked
, h_connection_keep_alive
, h_connection_close
};
enum http_host_state
{
s_http_host_dead = 1
, s_http_userinfo_start
, s_http_userinfo
, s_http_host_start
, s_http_host_v6_start
, s_http_host
, s_http_host_v6
, s_http_host_v6_end
, s_http_host_v6_zone_start
, s_http_host_v6_zone
, s_http_host_port_start
, s_http_host_port
};
/* Macros for character classes; depends on strict-mode */
#define CROW_LOWER(c) (unsigned char)(c | 0x20)
#define CROW_IS_ALPHA(c) (CROW_LOWER(c) >= 'a' && CROW_LOWER(c) <= 'z')
#define CROW_IS_NUM(c) ((c) >= '0' && (c) <= '9')
#define CROW_IS_ALPHANUM(c) (CROW_IS_ALPHA(c) || CROW_IS_NUM(c))
//#define CROW_IS_HEX(c) (CROW_IS_NUM(c) || (CROW_LOWER(c) >= 'a' && CROW_LOWER(c) <= 'f'))
#define CROW_IS_MARK(c) ((c) == '-' || (c) == '_' || (c) == '.' || \
(c) == '!' || (c) == '~' || (c) == '*' || (c) == '\'' || (c) == '(' || \
(c) == ')')
#define CROW_IS_USERINFO_CHAR(c) (CROW_IS_ALPHANUM(c) || CROW_IS_MARK(c) || (c) == '%' || \
(c) == ';' || (c) == ':' || (c) == '&' || (c) == '=' || (c) == '+' || \
(c) == '$' || (c) == ',')
#define CROW_TOKEN(c) (tokens[(unsigned char)c])
#define CROW_IS_URL_CHAR(c) (CROW_BIT_AT(normal_url_char, (unsigned char)c))
//#define CROW_IS_HOST_CHAR(c) (CROW_IS_ALPHANUM(c) || (c) == '.' || (c) == '-')
/**
* Verify that a char is a valid visible (printable) US-ASCII
* character or %x80-FF
**/
#define CROW_IS_HEADER_CHAR(ch) \
(ch == cr || ch == lf || ch == 9 || ((unsigned char)ch > 31 && ch != 127))
#define CROW_start_state s_start_req
# define CROW_STRICT_CHECK(cond) \
do { \
if (cond) { \
CROW_SET_ERRNO(CHPE_STRICT); \
goto error; \
} \
} while (0)
#define CROW_NEW_MESSAGE() (CROW_start_state)
/* Our URL parser.
*
* This is designed to be shared by http_parser_execute() for URL validation,
* hence it has a state transition + byte-for-byte interface. In addition, it
* is meant to be embedded in http_parser_parse_url(), which does the dirty
* work of turning state transitions URL components for its API.
*
* This function should only be invoked with non-space characters. It is
* assumed that the caller cares about (and can detect) the transition between
* URL and non-URL states by looking for these.
*/
inline enum state
parse_url_char(enum state s, const char ch, http_parser *parser, const char* url_mark, const char* p)
{
# define CROW_T(v) 0
static const uint8_t normal_url_char[32] = {
/* 0 nul 1 soh 2 stx 3 etx 4 eot 5 enq 6 ack 7 bel */
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0,
/* 8 bs 9 ht 10 nl 11 vt 12 np 13 cr 14 so 15 si */
0 |CROW_T(2)| 0 | 0 |CROW_T(16)| 0 | 0 | 0,
/* 16 dle 17 dc1 18 dc2 19 dc3 20 dc4 21 nak 22 syn 23 etb */
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0,
/* 24 can 25 em 26 sub 27 esc 28 fs 29 gs 30 rs 31 us */
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0,
/* 32 sp 33 ! 34 " 35 # 36 $ 37 % 38 & 39 ' */
0 | 2 | 4 | 0 | 16 | 32 | 64 | 128,
/* 40 ( 41 ) 42 * 43 + 44 , 45 - 46 . 47 / */
1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
/* 48 0 49 1 50 2 51 3 52 4 53 5 54 6 55 7 */
1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
/* 56 8 57 9 58 : 59 ; 60 < 61 = 62 > 63 ? */
1 | 2 | 4 | 8 | 16 | 32 | 64 | 0,
/* 64 @ 65 A 66 B 67 C 68 D 69 E 70 F 71 G */
1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
/* 72 H 73 I 74 J 75 K 76 L 77 M 78 N 79 O */
1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
/* 80 P 81 Q 82 R 83 S 84 CROW_T 85 U 86 V 87 W */
1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
/* 88 X 89 Y 90 Z 91 [ 92 \ 93 ] 94 ^ 95 _ */
1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
/* 96 ` 97 a 98 b 99 c 100 d 101 e 102 f 103 g */
1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
/* 104 h 105 i 106 j 107 k 108 l 109 m 110 n 111 o */
1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
/* 112 p 113 q 114 r 115 s 116 t 117 u 118 v 119 w */
1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
/* 120 x 121 y 122 z 123 { 124 | 125 } 126 ~ 127 del */
1 | 2 | 4 | 8 | 16 | 32 | 64 | 0, };
#undef CROW_T
if (ch == ' ' || ch == '\r' || ch == '\n') {
return s_dead;
}
if (ch == '\t' || ch == '\f') {
return s_dead;
}
switch (s) {
case s_req_spaces_before_url:
/* Proxied requests are followed by scheme of an absolute URI (alpha).
* All methods except CONNECT are followed by '/' or '*'.
*/
if (ch == '/' || ch == '*') {
return s_req_path;
}
if (CROW_IS_ALPHA(ch)) {
return s_req_schema;
}
break;
case s_req_schema:
if (CROW_IS_ALPHA(ch)) {
return s;
}
if (ch == ':') {
return s_req_schema_slash;
}
break;
case s_req_schema_slash:
if (ch == '/') {
return s_req_schema_slash_slash;
}
break;
case s_req_schema_slash_slash:
if (ch == '/') {
return s_req_server_start;
}
break;
case s_req_server_with_at:
if (ch == '@') {
return s_dead;
}
/* fall through */
case s_req_server_start:
case s_req_server:
if (ch == '/') {
return s_req_path;
}
if (ch == '?') {
parser->qs_point = p - url_mark;
return s_req_query_string_start;
}
if (ch == '@') {
return s_req_server_with_at;
}
if (CROW_IS_USERINFO_CHAR(ch) || ch == '[' || ch == ']') {
return s_req_server;
}
break;
case s_req_path:
if (CROW_IS_URL_CHAR(ch)) {
return s;
}
else if (ch == '?')
{
parser->qs_point = p - url_mark;
return s_req_query_string_start;
}
break;
case s_req_query_string_start:
case s_req_query_string:
if (CROW_IS_URL_CHAR(ch)) {
return s_req_query_string;
}
else if (ch == '?')
{
return s_req_query_string;
}
break;
default:
break;
}
/* We should never fall out of the switch above unless there's an error */
return s_dead;
}
inline size_t http_parser_execute (http_parser *parser,
const http_parser_settings *settings,
const char *data,
size_t len)
{
/* Tokens as defined by rfc 2616. Also lowercases them.
* token = 1*<any CHAR except CTLs or separators>
* separators = "(" | ")" | "<" | ">" | "@"
* | "," | ";" | ":" | "\" | <">
* | "/" | "[" | "]" | "?" | "="
* | "{" | "}" | SP | HT
*/
static const char tokens[256] = {
/* 0 nul 1 soh 2 stx 3 etx 4 eot 5 enq 6 ack 7 bel */
0, 0, 0, 0, 0, 0, 0, 0,
/* 8 bs 9 ht 10 nl 11 vt 12 np 13 cr 14 so 15 si */
0, 0, 0, 0, 0, 0, 0, 0,
/* 16 dle 17 dc1 18 dc2 19 dc3 20 dc4 21 nak 22 syn 23 etb */
0, 0, 0, 0, 0, 0, 0, 0,
/* 24 can 25 em 26 sub 27 esc 28 fs 29 gs 30 rs 31 us */
0, 0, 0, 0, 0, 0, 0, 0,
/* 32 sp 33 ! 34 " 35 # 36 $ 37 % 38 & 39 ' */
0, '!', 0, '#', '$', '%', '&', '\'',
/* 40 ( 41 ) 42 * 43 + 44 , 45 - 46 . 47 / */
0, 0, '*', '+', 0, '-', '.', 0,
/* 48 0 49 1 50 2 51 3 52 4 53 5 54 6 55 7 */
'0', '1', '2', '3', '4', '5', '6', '7',
/* 56 8 57 9 58 : 59 ; 60 < 61 = 62 > 63 ? */
'8', '9', 0, 0, 0, 0, 0, 0,
/* 64 @ 65 A 66 B 67 C 68 D 69 E 70 F 71 G */
0, 'a', 'b', 'c', 'd', 'e', 'f', 'g',
/* 72 H 73 I 74 J 75 K 76 L 77 M 78 N 79 O */
'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
/* 80 P 81 Q 82 R 83 S 84 T 85 U 86 V 87 W */
'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
/* 88 X 89 Y 90 Z 91 [ 92 \ 93 ] 94 ^ 95 _ */
'x', 'y', 'z', 0, 0, 0, '^', '_',
/* 96 ` 97 a 98 b 99 c 100 d 101 e 102 f 103 g */
'`', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
/* 104 h 105 i 106 j 107 k 108 l 109 m 110 n 111 o */
'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
/* 112 p 113 q 114 r 115 s 116 t 117 u 118 v 119 w */
'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
/* 120 x 121 y 122 z 123 { 124 | 125 } 126 ~ 127 del */
'x', 'y', 'z', 0, '|', 0, '~', 0 };
static const int8_t unhex[256] =
{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1
,-1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1
,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
,-1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1
,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
};
char c, ch;
int8_t unhex_val;
const char *p = data;
const char *header_field_mark = 0;
const char *header_value_mark = 0;
const char *url_mark = 0;
const char *url_start_mark = 0;
const char *body_mark = 0;
const unsigned int lenient = parser->lenient_http_headers;
const unsigned int allow_chunked_length = parser->allow_chunked_length;
uint32_t nread = parser->nread;
/* We're in an error state. Don't bother doing anything. */
if (CROW_HTTP_PARSER_ERRNO(parser) != CHPE_OK) {
return 0;
}
if (len == 0) {
switch (parser->state) {
case s_body_identity_eof:
/* Use of CROW_CALLBACK_NOTIFY() here would erroneously return 1 byte read if we got paused. */
CROW_CALLBACK_NOTIFY_NOADVANCE(message_complete);
return 0;
case s_dead:
case s_start_req:
return 0;
default:
CROW_SET_ERRNO(CHPE_INVALID_EOF_STATE);
return 1;
}
}
if (parser->state == s_header_field)
header_field_mark = data;
if (parser->state == s_header_value)
header_value_mark = data;
switch (parser->state) {
case s_req_path:
case s_req_schema:
case s_req_schema_slash:
case s_req_schema_slash_slash:
case s_req_server_start:
case s_req_server:
case s_req_server_with_at:
case s_req_query_string_start:
case s_req_query_string:
url_mark = data;
break;
default:
break;
}
for (p=data; p != data + len; p++) {
ch = *p;
if (CROW_PARSING_HEADER(parser->state))
CROW_COUNT_HEADER_SIZE(1);
reexecute:
switch (parser->state) {
case s_dead:
/* this state is used after a 'Connection: close' message
* the parser will error out if it reads another message
*/
if (CROW_LIKELY(ch == cr || ch == lf))
break;
CROW_SET_ERRNO(CHPE_CLOSED_CONNECTION);
goto error;
case s_start_req:
{
if (ch == cr || ch == lf)
break;
parser->flags = 0;
parser->uses_transfer_encoding = 0;
parser->content_length = CROW_ULLONG_MAX;
if (CROW_UNLIKELY(!CROW_IS_ALPHA(ch))) {
CROW_SET_ERRNO(CHPE_INVALID_METHOD);
goto error;
}
parser->method = 0;
parser->index = 1;
switch (ch) {
case 'A': parser->method = (unsigned)HTTPMethod::Acl; break;
case 'B': parser->method = (unsigned)HTTPMethod::Bind; break;
case 'C': parser->method = (unsigned)HTTPMethod::Connect; /* or COPY, CHECKOUT */ break;
case 'D': parser->method = (unsigned)HTTPMethod::Delete; break;
case 'G': parser->method = (unsigned)HTTPMethod::Get; break;
case 'H': parser->method = (unsigned)HTTPMethod::Head; break;
case 'L': parser->method = (unsigned)HTTPMethod::Lock; /* or LINK */ break;
case 'M': parser->method = (unsigned)HTTPMethod::MkCol; /* or MOVE, MKACTIVITY, MERGE, M-SEARCH, MKCALENDAR */ break;
case 'N': parser->method = (unsigned)HTTPMethod::Notify; break;
case 'O': parser->method = (unsigned)HTTPMethod::Options; break;
case 'P': parser->method = (unsigned)HTTPMethod::Post; /* or PROPFIND|PROPPATCH|PUT|PATCH|PURGE */ break;
case 'R': parser->method = (unsigned)HTTPMethod::Report; /* or REBIND */ break;
case 'S': parser->method = (unsigned)HTTPMethod::Subscribe; /* or SEARCH, SOURCE */ break;
case 'T': parser->method = (unsigned)HTTPMethod::Trace; break;
case 'U': parser->method = (unsigned)HTTPMethod::Unlock; /* or UNSUBSCRIBE, UNBIND, UNLINK */ break;
default:
CROW_SET_ERRNO(CHPE_INVALID_METHOD);
goto error;
}
parser->state = s_req_method;
CROW_CALLBACK_NOTIFY(message_begin);
break;
}
case s_req_method:
{
const char *matcher;
if (CROW_UNLIKELY(ch == '\0')) {
CROW_SET_ERRNO(CHPE_INVALID_METHOD);
goto error;
}
matcher = method_strings[parser->method];
if (ch == ' ' && matcher[parser->index] == '\0') {
parser->state = s_req_spaces_before_url;
} else if (ch == matcher[parser->index]) {
; /* nada */
} else if ((ch >= 'A' && ch <= 'Z') || ch == '-') {
switch (parser->method << 16 | parser->index << 8 | ch) {
#define CROW_XX(meth, pos, ch, new_meth) \
case ((unsigned)HTTPMethod::meth << 16 | pos << 8 | ch): \
parser->method = (unsigned)HTTPMethod::new_meth; break;
CROW_XX(Post, 1, 'U', Put)
CROW_XX(Post, 1, 'A', Patch)
CROW_XX(Post, 1, 'R', Propfind)
CROW_XX(Put, 2, 'R', Purge)
CROW_XX(Connect, 1, 'H', Checkout)
CROW_XX(Connect, 2, 'P', Copy)
CROW_XX(MkCol, 1, 'O', Move)
CROW_XX(MkCol, 1, 'E', Merge)
CROW_XX(MkCol, 1, '-', MSearch)
CROW_XX(MkCol, 2, 'A', MkActivity)
CROW_XX(MkCol, 3, 'A', MkCalendar)
CROW_XX(Subscribe, 1, 'E', Search)
CROW_XX(Subscribe, 1, 'O', Source)
CROW_XX(Report, 2, 'B', Rebind)
CROW_XX(Propfind, 4, 'P', Proppatch)
CROW_XX(Lock, 1, 'I', Link)
CROW_XX(Unlock, 2, 'S', Unsubscribe)
CROW_XX(Unlock, 2, 'B', Unbind)
CROW_XX(Unlock, 3, 'I', Unlink)
#undef CROW_XX
default:
CROW_SET_ERRNO(CHPE_INVALID_METHOD);
goto error;
}
} else {
CROW_SET_ERRNO(CHPE_INVALID_METHOD);
goto error;
}
CROW_CALLBACK_NOTIFY_NOADVANCE(method);
++parser->index;
break;
}
case s_req_spaces_before_url:
{
if (ch == ' ') break;
CROW_MARK(url);
CROW_MARK(url_start);
if (parser->method == (unsigned)HTTPMethod::Connect) {
parser->state = s_req_server_start;
}
parser->state = parse_url_char(static_cast<state>(parser->state), ch, parser, url_start_mark, p);
if (CROW_UNLIKELY(parser->state == s_dead)) {
CROW_SET_ERRNO(CHPE_INVALID_URL);
goto error;
}
break;
}
case s_req_schema:
case s_req_schema_slash:
case s_req_schema_slash_slash:
case s_req_server_start:
{
switch (ch) {
/* No whitespace allowed here */
case ' ':
case cr:
case lf:
CROW_SET_ERRNO(CHPE_INVALID_URL);
goto error;
default:
parser->state = parse_url_char(static_cast<state>(parser->state), ch, parser, url_start_mark, p);
if (CROW_UNLIKELY(parser->state == s_dead)) {
CROW_SET_ERRNO(CHPE_INVALID_URL);
goto error;
}
}
break;
}
case s_req_server:
case s_req_server_with_at:
case s_req_path:
case s_req_query_string_start:
case s_req_query_string:
{
switch (ch) {
case ' ':
parser->state = s_req_http_start;
CROW_CALLBACK_DATA(url);
break;
case cr: // No space after URL means no HTTP version. Which means the request is using HTTP/0.9
case lf:
if (CROW_UNLIKELY(parser->method != (unsigned)HTTPMethod::Get)) // HTTP/0.9 doesn't define any method other than GET
{
parser->state = s_dead;
CROW_SET_ERRNO(CHPE_INVALID_VERSION);
goto error;
}
parser->http_major = 0;
parser->http_minor = 9;
parser->state = (ch == cr) ?
s_req_line_almost_done :
s_header_field_start;
CROW_CALLBACK_DATA(url);
break;
default:
parser->state = parse_url_char(static_cast<state>(parser->state), ch, parser, url_start_mark, p);
if (CROW_UNLIKELY(parser->state == s_dead)) {
CROW_SET_ERRNO(CHPE_INVALID_URL);
goto error;
}
}
break;
}
case s_req_http_start:
switch (ch) {
case ' ':
break;
case 'H':
parser->state = s_req_http_H;
break;
case 'I':
if (parser->method == (unsigned)HTTPMethod::Source) {
parser->state = s_req_http_I;
break;
}
/* fall through */
default:
CROW_SET_ERRNO(CHPE_INVALID_CONSTANT);
goto error;
}
break;
case s_req_http_H:
CROW_STRICT_CHECK(ch != 'T');
parser->state = s_req_http_HT;
break;
case s_req_http_HT:
CROW_STRICT_CHECK(ch != 'T');
parser->state = s_req_http_HTT;
break;
case s_req_http_HTT:
CROW_STRICT_CHECK(ch != 'P');
parser->state = s_req_http_HTTP;
break;
case s_req_http_I:
CROW_STRICT_CHECK(ch != 'C');
parser->state = s_req_http_IC;
break;
case s_req_http_IC:
CROW_STRICT_CHECK(ch != 'E');
parser->state = s_req_http_HTTP; /* Treat "ICE" as "HTTP". */
break;
case s_req_http_HTTP:
CROW_STRICT_CHECK(ch != '/');
parser->state = s_req_http_major;
break;
/* dot */
case s_req_http_major:
if (CROW_UNLIKELY(!CROW_IS_NUM(ch))) {
CROW_SET_ERRNO(CHPE_INVALID_VERSION);
goto error;
}
parser->http_major = ch - '0';
parser->state = s_req_http_dot;
break;
case s_req_http_dot:
{
if (CROW_UNLIKELY(ch != '.')) {
CROW_SET_ERRNO(CHPE_INVALID_VERSION);
goto error;
}
parser->state = s_req_http_minor;
break;
}
/* minor HTTP version */
case s_req_http_minor:
if (CROW_UNLIKELY(!CROW_IS_NUM(ch))) {
CROW_SET_ERRNO(CHPE_INVALID_VERSION);
goto error;
}
parser->http_minor = ch - '0';
parser->state = s_req_http_end;
break;
/* end of request line */
case s_req_http_end:
{
if (ch == cr) {
parser->state = s_req_line_almost_done;
break;
}
if (ch == lf) {
parser->state = s_header_field_start;
break;
}
CROW_SET_ERRNO(CHPE_INVALID_VERSION);
goto error;
break;
}
/* end of request line */
case s_req_line_almost_done:
{
if (CROW_UNLIKELY(ch != lf)) {
CROW_SET_ERRNO(CHPE_LF_EXPECTED);
goto error;
}
parser->state = s_header_field_start;
break;
}
case s_header_field_start:
{
if (ch == cr) {
parser->state = s_headers_almost_done;
break;
}
if (ch == lf) {
/* they might be just sending \n instead of \r\n so this would be
* the second \n to denote the end of headers*/
parser->state = s_headers_almost_done;
CROW_REEXECUTE();
}
c = CROW_TOKEN(ch);
if (CROW_UNLIKELY(!c)) {
CROW_SET_ERRNO(CHPE_INVALID_HEADER_TOKEN);
goto error;
}
CROW_MARK(header_field);
parser->index = 0;
parser->state = s_header_field;
switch (c) {
case 'c':
parser->header_state = h_C;
break;
case 'p':
parser->header_state = h_matching_proxy_connection;
break;
case 't':
parser->header_state = h_matching_transfer_encoding;
break;
case 'u':
parser->header_state = h_matching_upgrade;
break;
default:
parser->header_state = h_general;
break;
}
break;
}
case s_header_field:
{
const char* start = p;
for (; p != data + len; p++) {
ch = *p;
c = CROW_TOKEN(ch);
if (!c)
break;
switch (parser->header_state) {
case h_general: {
size_t left = data + len - p;
const char* pe = p + CROW_MIN(left, max_header_size);
while (p+1 < pe && CROW_TOKEN(p[1])) {
p++;
}
break;
}
case h_C:
parser->index++;
parser->header_state = (c == 'o' ? h_CO : h_general);
break;
case h_CO:
parser->index++;
parser->header_state = (c == 'n' ? h_CON : h_general);
break;
case h_CON:
parser->index++;
switch (c) {
case 'n':
parser->header_state = h_matching_connection;
break;
case 't':
parser->header_state = h_matching_content_length;
break;
default:
parser->header_state = h_general;
break;
}
break;
/* connection */
case h_matching_connection:
parser->index++;
if (parser->index > sizeof(CROW_CONNECTION)-1 || c != CROW_CONNECTION[parser->index]) {
parser->header_state = h_general;
} else if (parser->index == sizeof(CROW_CONNECTION)-2) {
parser->header_state = h_connection;
}
break;
/* proxy-connection */
case h_matching_proxy_connection:
parser->index++;
if (parser->index > sizeof(CROW_PROXY_CONNECTION)-1 || c != CROW_PROXY_CONNECTION[parser->index]) {
parser->header_state = h_general;
} else if (parser->index == sizeof(CROW_PROXY_CONNECTION)-2) {
parser->header_state = h_connection;
}
break;
/* content-length */
case h_matching_content_length:
parser->index++;
if (parser->index > sizeof(CROW_CONTENT_LENGTH)-1 || c != CROW_CONTENT_LENGTH[parser->index]) {
parser->header_state = h_general;
} else if (parser->index == sizeof(CROW_CONTENT_LENGTH)-2) {
parser->header_state = h_content_length;
}
break;
/* transfer-encoding */
case h_matching_transfer_encoding:
parser->index++;
if (parser->index > sizeof(CROW_TRANSFER_ENCODING)-1 || c != CROW_TRANSFER_ENCODING[parser->index]) {
parser->header_state = h_general;
} else if (parser->index == sizeof(CROW_TRANSFER_ENCODING)-2) {
parser->header_state = h_transfer_encoding;
parser->uses_transfer_encoding = 1;
}
break;
/* upgrade */
case h_matching_upgrade:
parser->index++;
if (parser->index > sizeof(CROW_UPGRADE)-1 || c != CROW_UPGRADE[parser->index]) {
parser->header_state = h_general;
} else if (parser->index == sizeof(CROW_UPGRADE)-2) {
parser->header_state = h_upgrade;
}
break;
case h_connection:
case h_content_length:
case h_transfer_encoding:
case h_upgrade:
if (ch != ' ') parser->header_state = h_general;
break;
default:
assert(0 && "Unknown header_state");
break;
}
}
if (p == data + len) {
--p;
CROW_COUNT_HEADER_SIZE(p - start);
break;
}
CROW_COUNT_HEADER_SIZE(p - start);
if (ch == ':') {
parser->state = s_header_value_discard_ws;
CROW_CALLBACK_DATA(header_field);
break;
}
/* RFC-7230 Sec 3.2.4 expressly forbids line-folding in header field-names.
if (ch == cr) {
parser->state = s_header_almost_done;
CROW_CALLBACK_DATA(header_field);
break;
}
if (ch == lf) {
parser->state = s_header_field_start;
CROW_CALLBACK_DATA(header_field);
break;
}
*/
CROW_SET_ERRNO(CHPE_INVALID_HEADER_TOKEN);
goto error;
}
case s_header_value_discard_ws:
if (ch == ' ' || ch == '\t') break;
if (ch == cr) {
parser->state = s_header_value_discard_ws_almost_done;
break;
}
if (ch == lf) {
parser->state = s_header_value_discard_lws;
break;
}
/* fall through */
case s_header_value_start:
{
CROW_MARK(header_value);
parser->state = s_header_value;
parser->index = 0;
c = CROW_LOWER(ch);
switch (parser->header_state) {
case h_upgrade:
// Crow does not support HTTP/2 at the moment.
// According to the RFC https://datatracker.ietf.org/doc/html/rfc7540#section-3.2
// "A server that does not support HTTP/2 can respond to the request as though the Upgrade header field were absent"
// => `F_UPGRADE` is not set if the header starts by "h2".
// This prevents the parser from skipping the request body.
if (ch != 'h' || p+1 == (data + len) || *(p+1) != '2') {
parser->flags |= F_UPGRADE;
}
parser->header_state = h_general;
break;
case h_transfer_encoding:
/* looking for 'Transfer-Encoding: chunked' */
if ('c' == c) {
parser->header_state = h_matching_transfer_encoding_chunked;
} else {
parser->header_state = h_matching_transfer_encoding_token;
}
break;
/* Multi-value `Transfer-Encoding` header */
case h_matching_transfer_encoding_token_start:
break;
case h_content_length:
if (CROW_UNLIKELY(!CROW_IS_NUM(ch))) {
CROW_SET_ERRNO(CHPE_INVALID_CONTENT_LENGTH);
goto error;
}
if (parser->flags & F_CONTENTLENGTH) {
CROW_SET_ERRNO(CHPE_UNEXPECTED_CONTENT_LENGTH);
goto error;
}
parser->flags |= F_CONTENTLENGTH;
parser->content_length = ch - '0';
parser->header_state = h_content_length_num;
break;
/* when obsolete line folding is encountered for content length
* continue to the s_header_value state */
case h_content_length_ws:
break;
case h_connection:
/* looking for 'Connection: keep-alive' */
if (c == 'k') {
parser->header_state = h_matching_connection_keep_alive;
/* looking for 'Connection: close' */
} else if (c == 'c') {
parser->header_state = h_matching_connection_close;
} else if (c == ' ' || c == '\t') {
/* Skip lws */
} else {
parser->header_state = h_general;
}
break;
default:
parser->header_state = h_general;
break;
}
break;
}
case s_header_value:
{
const char* start = p;
enum header_states h_state = static_cast<header_states>(parser->header_state);
for (; p != data + len; p++) {
ch = *p;
if (ch == cr) {
parser->state = s_header_almost_done;
parser->header_state = h_state;
CROW_CALLBACK_DATA(header_value);
break;
}
if (ch == lf) {
parser->state = s_header_almost_done;
CROW_COUNT_HEADER_SIZE(p - start);
parser->header_state = h_state;
CROW_CALLBACK_DATA_NOADVANCE(header_value);
CROW_REEXECUTE();
}
if (!lenient && !CROW_IS_HEADER_CHAR(ch)) {
CROW_SET_ERRNO(CHPE_INVALID_HEADER_TOKEN);
goto error;
}
c = CROW_LOWER(ch);
switch (h_state) {
case h_general:
{
size_t left = data + len - p;
const char* pe = p + CROW_MIN(left, max_header_size);
for (; p != pe; p++) {
ch = *p;
if (ch == cr || ch == lf) {
--p;
break;
}
if (!lenient && !CROW_IS_HEADER_CHAR(ch)) {
CROW_SET_ERRNO(CHPE_INVALID_HEADER_TOKEN);
goto error;
}
}
if (p == data + len)
--p;
break;
}
case h_connection:
case h_transfer_encoding:
assert(0 && "Shouldn't get here.");
break;
case h_content_length:
if (ch == ' ') break;
h_state = h_content_length_num;
/* fall through */
case h_content_length_num:
{
uint64_t t;
if (ch == ' ') {
h_state = h_content_length_ws;
break;
}
if (CROW_UNLIKELY(!CROW_IS_NUM(ch))) {
CROW_SET_ERRNO(CHPE_INVALID_CONTENT_LENGTH);
parser->header_state = h_state;
goto error;
}
t = parser->content_length;
t *= 10;
t += ch - '0';
/* Overflow? Test against a conservative limit for simplicity. */
if (CROW_UNLIKELY((CROW_ULLONG_MAX - 10) / 10 < parser->content_length)) {
CROW_SET_ERRNO(CHPE_INVALID_CONTENT_LENGTH);
parser->header_state = h_state;
goto error;
}
parser->content_length = t;
break;
}
case h_content_length_ws:
if (ch == ' ') break;
CROW_SET_ERRNO(CHPE_INVALID_CONTENT_LENGTH);
parser->header_state = h_state;
goto error;
/* Transfer-Encoding: chunked */
case h_matching_transfer_encoding_token_start:
/* looking for 'Transfer-Encoding: chunked' */
if ('c' == c) {
h_state = h_matching_transfer_encoding_chunked;
} else if (CROW_TOKEN(c)) {
/* TODO(indutny): similar code below does this, but why?
* At the very least it seems to be inconsistent given that
* h_matching_transfer_encoding_token does not check for
* `STRICT_TOKEN`
*/
h_state = h_matching_transfer_encoding_token;
} else if (c == ' ' || c == '\t') {
/* Skip lws */
} else {
h_state = h_general;
}
break;
case h_matching_transfer_encoding_chunked:
parser->index++;
if (parser->index > sizeof(CROW_CHUNKED)-1 || c != CROW_CHUNKED[parser->index]) {
h_state = h_matching_transfer_encoding_token;
} else if (parser->index == sizeof(CROW_CHUNKED)-2) {
h_state = h_transfer_encoding_chunked;
}
break;
case h_matching_transfer_encoding_token:
if (ch == ',') {
h_state = h_matching_transfer_encoding_token_start;
parser->index = 0;
}
break;
/* looking for 'Connection: keep-alive' */
case h_matching_connection_keep_alive:
parser->index++;
if (parser->index > sizeof(CROW_KEEP_ALIVE)-1 || c != CROW_KEEP_ALIVE[parser->index]) {
h_state = h_general;
} else if (parser->index == sizeof(CROW_KEEP_ALIVE)-2) {
h_state = h_connection_keep_alive;
}
break;
/* looking for 'Connection: close' */
case h_matching_connection_close:
parser->index++;
if (parser->index > sizeof(CROW_CLOSE)-1 || c != CROW_CLOSE[parser->index]) {
h_state = h_general;
} else if (parser->index == sizeof(CROW_CLOSE)-2) {
h_state = h_connection_close;
}
break;
// Edited from original (because of commits that werent included)
case h_transfer_encoding_chunked:
if (ch != ' ') h_state = h_matching_transfer_encoding_token;
break;
case h_connection_keep_alive:
case h_connection_close:
if (ch != ' ') h_state = h_general;
break;
default:
parser->state = s_header_value;
h_state = h_general;
break;
}
}
parser->header_state = h_state;
if (p == data + len)
--p;
CROW_COUNT_HEADER_SIZE(p - start);
break;
}
case s_header_almost_done:
{
if (CROW_UNLIKELY(ch != lf)) {
CROW_SET_ERRNO(CHPE_LF_EXPECTED);
goto error;
}
parser->state = s_header_value_lws;
break;
}
case s_header_value_lws:
{
if (ch == ' ' || ch == '\t') {
if (parser->header_state == h_content_length_num) {
/* treat obsolete line folding as space */
parser->header_state = h_content_length_ws;
}
parser->state = s_header_value_start;
CROW_REEXECUTE();
}
/* finished the header */
switch (parser->header_state) {
case h_connection_keep_alive:
parser->flags |= F_CONNECTION_KEEP_ALIVE;
break;
case h_connection_close:
parser->flags |= F_CONNECTION_CLOSE;
break;
case h_transfer_encoding_chunked:
parser->flags |= F_CHUNKED;
break;
default:
break;
}
parser->state = s_header_field_start;
CROW_REEXECUTE();
}
case s_header_value_discard_ws_almost_done:
{
CROW_STRICT_CHECK(ch != lf);
parser->state = s_header_value_discard_lws;
break;
}
case s_header_value_discard_lws:
{
if (ch == ' ' || ch == '\t') {
parser->state = s_header_value_discard_ws;
break;
} else {
/* header value was empty */
CROW_MARK(header_value);
parser->state = s_header_field_start;
CROW_CALLBACK_DATA_NOADVANCE(header_value);
CROW_REEXECUTE();
}
}
case s_headers_almost_done:
{
CROW_STRICT_CHECK(ch != lf);
if (parser->flags & F_TRAILING) {
/* End of a chunked request */
CROW_CALLBACK_NOTIFY(message_complete);
break;
}
/* Cannot use transfer-encoding and a content-length header together
per the HTTP specification. (RFC 7230 Section 3.3.3) */
if ((parser->uses_transfer_encoding == 1) &&
(parser->flags & F_CONTENTLENGTH)) {
/* Allow it for lenient parsing as long as `Transfer-Encoding` is
* not `chunked` or allow_length_with_encoding is set
*/
if (parser->flags & F_CHUNKED) {
if (!allow_chunked_length) {
CROW_SET_ERRNO(CHPE_UNEXPECTED_CONTENT_LENGTH);
goto error;
}
} else if (!lenient) {
CROW_SET_ERRNO(CHPE_UNEXPECTED_CONTENT_LENGTH);
goto error;
}
}
parser->state = s_headers_done;
/* Set this here so that on_headers_complete() callbacks can see it */
parser->upgrade =
(parser->flags & F_UPGRADE || parser->method == (unsigned)HTTPMethod::Connect);
/* Here we call the headers_complete callback. This is somewhat
* different than other callbacks because if the user returns 1, we
* will interpret that as saying that this message has no body. This
* is needed for the annoying case of recieving a response to a HEAD
* request.
*
* We'd like to use CROW_CALLBACK_NOTIFY_NOADVANCE() here but we cannot, so
* we have to simulate it by handling a change in errno below.
*/
if (settings->on_headers_complete) {
switch (settings->on_headers_complete(parser)) {
case 0:
break;
case 2:
parser->upgrade = 1;
//break;
/* fall through */
case 1:
parser->flags |= F_SKIPBODY;
break;
default:
CROW_SET_ERRNO(CHPE_CB_headers_complete);
parser->nread = nread;
return p - data; /* Error */
}
}
if (CROW_HTTP_PARSER_ERRNO(parser) != CHPE_OK) {
parser->nread = nread;
return p - data;
}
CROW_REEXECUTE();
}
case s_headers_done:
{
CROW_STRICT_CHECK(ch != lf);
parser->nread = 0;
nread = 0;
/* Exit, the rest of the connect is in a different protocol. */
if (parser->upgrade) {
CROW_CALLBACK_NOTIFY(message_complete);
parser->nread = nread;
return (p - data) + 1;
}
if (parser->flags & F_SKIPBODY) {
CROW_CALLBACK_NOTIFY(message_complete);
} else if (parser->flags & F_CHUNKED) {
/* chunked encoding - ignore Content-Length header,
* prepare for a chunk */
parser->state = s_chunk_size_start;
}
else if (parser->uses_transfer_encoding == 1)
{
if (!lenient)
{
/* RFC 7230 3.3.3 */
/* If a Transfer-Encoding header field
* is present in a request and the chunked transfer coding is not
* the final encoding, the message body length cannot be determined
* reliably; the server MUST respond with the 400 (Bad Request)
* status code and then close the connection.
*/
CROW_SET_ERRNO(CHPE_INVALID_TRANSFER_ENCODING);
parser->nread = nread;
return (p - data); /* Error */
}
else
{
/* RFC 7230 3.3.3 */
/* If a Transfer-Encoding header field is present in a response and
* the chunked transfer coding is not the final encoding, the
* message body length is determined by reading the connection until
* it is closed by the server.
*/
parser->state = s_body_identity_eof;
}
}
else
{
if (parser->content_length == 0)
{
/* Content-Length header given but zero: Content-Length: 0\r\n */
CROW_CALLBACK_NOTIFY(message_complete);
}
else if (parser->content_length != CROW_ULLONG_MAX)
{
/* Content-Length header given and non-zero */
parser->state = s_body_identity;
}
else
{
/* Assume content-length 0 - read the next */
CROW_CALLBACK_NOTIFY(message_complete);
}
}
break;
}
case s_body_identity:
{
uint64_t to_read = CROW_MIN(parser->content_length,
(uint64_t) ((data + len) - p));
assert(parser->content_length != 0
&& parser->content_length != CROW_ULLONG_MAX);
/* The difference between advancing content_length and p is because
* the latter will automaticaly advance on the next loop iteration.
* Further, if content_length ends up at 0, we want to see the last
* byte again for our message complete callback.
*/
CROW_MARK(body);
parser->content_length -= to_read;
p += to_read - 1;
if (parser->content_length == 0) {
parser->state = s_message_done;
/* Mimic CROW_CALLBACK_DATA_NOADVANCE() but with one extra byte.
*
* The alternative to doing this is to wait for the next byte to
* trigger the data callback, just as in every other case. The
* problem with this is that this makes it difficult for the test
* harness to distinguish between complete-on-EOF and
* complete-on-length. It's not clear that this distinction is
* important for applications, but let's keep it for now.
*/
CROW_CALLBACK_DATA_(body, p - body_mark + 1, p - data);
CROW_REEXECUTE();
}
break;
}
/* read until EOF */
case s_body_identity_eof:
CROW_MARK(body);
p = data + len - 1;
break;
case s_message_done:
CROW_CALLBACK_NOTIFY(message_complete);
break;
case s_chunk_size_start:
{
assert(nread == 1);
assert(parser->flags & F_CHUNKED);
unhex_val = unhex[static_cast<unsigned char>(ch)];
if (CROW_UNLIKELY(unhex_val == -1)) {
CROW_SET_ERRNO(CHPE_INVALID_CHUNK_SIZE);
goto error;
}
parser->content_length = unhex_val;
parser->state = s_chunk_size;
break;
}
case s_chunk_size:
{
uint64_t t;
assert(parser->flags & F_CHUNKED);
if (ch == cr) {
parser->state = s_chunk_size_almost_done;
break;
}
unhex_val = unhex[static_cast<unsigned char>(ch)];
if (unhex_val == -1) {
if (ch == ';' || ch == ' ') {
parser->state = s_chunk_parameters;
break;
}
CROW_SET_ERRNO(CHPE_INVALID_CHUNK_SIZE);
goto error;
}
t = parser->content_length;
t *= 16;
t += unhex_val;
/* Overflow? Test against a conservative limit for simplicity. */
if (CROW_UNLIKELY((CROW_ULLONG_MAX - 16) / 16 < parser->content_length)) {
CROW_SET_ERRNO(CHPE_INVALID_CONTENT_LENGTH);
goto error;
}
parser->content_length = t;
break;
}
case s_chunk_parameters:
{
assert(parser->flags & F_CHUNKED);
/* just ignore this shit. TODO check for overflow */
if (ch == cr) {
parser->state = s_chunk_size_almost_done;
break;
}
break;
}
case s_chunk_size_almost_done:
{
assert(parser->flags & F_CHUNKED);
CROW_STRICT_CHECK(ch != lf);
parser->nread = 0;
nread = 0;
if (parser->content_length == 0) {
parser->flags |= F_TRAILING;
parser->state = s_header_field_start;
} else {
parser->state = s_chunk_data;
}
break;
}
case s_chunk_data:
{
uint64_t to_read = CROW_MIN(parser->content_length,
(uint64_t) ((data + len) - p));
assert(parser->flags & F_CHUNKED);
assert(parser->content_length != 0
&& parser->content_length != CROW_ULLONG_MAX);
/* See the explanation in s_body_identity for why the content
* length and data pointers are managed this way.
*/
CROW_MARK(body);
parser->content_length -= to_read;
p += to_read - 1;
if (parser->content_length == 0) {
parser->state = s_chunk_data_almost_done;
}
break;
}
case s_chunk_data_almost_done:
assert(parser->flags & F_CHUNKED);
assert(parser->content_length == 0);
CROW_STRICT_CHECK(ch != cr);
parser->state = s_chunk_data_done;
CROW_CALLBACK_DATA(body);
break;
case s_chunk_data_done:
assert(parser->flags & F_CHUNKED);
CROW_STRICT_CHECK(ch != lf);
parser->nread = 0;
nread = 0;
parser->state = s_chunk_size_start;
break;
default:
assert(0 && "unhandled state");
CROW_SET_ERRNO(CHPE_INVALID_INTERNAL_STATE);
goto error;
}
}
/* Run callbacks for any marks that we have leftover after we ran out of
* bytes. There should be at most one of these set, so it's OK to invoke
* them in series (unset marks will not result in callbacks).
*
* We use the NOADVANCE() variety of callbacks here because 'p' has already
* overflowed 'data' and this allows us to correct for the off-by-one that
* we'd otherwise have (since CROW_CALLBACK_DATA() is meant to be run with a 'p'
* value that's in-bounds).
*/
assert(((header_field_mark ? 1 : 0) +
(header_value_mark ? 1 : 0) +
(url_mark ? 1 : 0) +
(body_mark ? 1 : 0)) <= 1);
CROW_CALLBACK_DATA_NOADVANCE(header_field);
CROW_CALLBACK_DATA_NOADVANCE(header_value);
CROW_CALLBACK_DATA_NOADVANCE(url);
CROW_CALLBACK_DATA_NOADVANCE(body);
parser->nread = nread;
return len;
error:
if (CROW_HTTP_PARSER_ERRNO(parser) == CHPE_OK) {
CROW_SET_ERRNO(CHPE_UNKNOWN);
}
parser->nread = nread;
return (p - data);
}
inline void
http_parser_init(http_parser* parser)
{
void *data = parser->data; /* preserve application data */
memset(parser, 0, sizeof(*parser));
parser->data = data;
parser->state = s_start_req;
parser->http_errno = CHPE_OK;
}
/* Return a string name of the given error */
inline const char *
http_errno_name(enum http_errno err) {
/* Map errno values to strings for human-readable output */
#define CROW_HTTP_STRERROR_GEN(n, s) { "CHPE_" #n, s },
static struct {
const char *name;
const char *description;
} http_strerror_tab[] = {
CROW_HTTP_ERRNO_MAP(CROW_HTTP_STRERROR_GEN)
};
#undef CROW_HTTP_STRERROR_GEN
assert(((size_t) err) < CROW_ARRAY_SIZE(http_strerror_tab));
return http_strerror_tab[err].name;
}
/* Return a string description of the given error */
inline const char *
http_errno_description(enum http_errno err) {
/* Map errno values to strings for human-readable output */
#define CROW_HTTP_STRERROR_GEN(n, s) { "CHPE_" #n, s },
static struct {
const char *name;
const char *description;
} http_strerror_tab[] = {
CROW_HTTP_ERRNO_MAP(CROW_HTTP_STRERROR_GEN)
};
#undef CROW_HTTP_STRERROR_GEN
assert(((size_t) err) < CROW_ARRAY_SIZE(http_strerror_tab));
return http_strerror_tab[err].description;
}
/* Checks if this is the final chunk of the body. */
inline int
http_body_is_final(const struct http_parser *parser) {
return parser->state == s_message_done;
}
/* Change the maximum header size provided at compile time. */
inline void
http_parser_set_max_header_size(uint32_t size) {
max_header_size = size;
}
#undef CROW_HTTP_ERRNO_MAP
#undef CROW_SET_ERRNO
#undef CROW_CALLBACK_NOTIFY_
#undef CROW_CALLBACK_NOTIFY
#undef CROW_CALLBACK_NOTIFY_NOADVANCE
#undef CROW_CALLBACK_DATA_
#undef CROW_CALLBACK_DATA
#undef CROW_CALLBACK_DATA_NOADVANCE
#undef CROW_MARK
#undef CROW_PROXY_CONNECTION
#undef CROW_CONNECTION
#undef CROW_CONTENT_LENGTH
#undef CROW_TRANSFER_ENCODING
#undef CROW_UPGRADE
#undef CROW_CHUNKED
#undef CROW_KEEP_ALIVE
#undef CROW_CLOSE
#undef CROW_PARSING_HEADER
#undef CROW_LOWER
#undef CROW_IS_ALPHA
#undef CROW_IS_NUM
#undef CROW_IS_ALPHANUM
//#undef CROW_IS_HEX
#undef CROW_IS_MARK
#undef CROW_IS_USERINFO_CHAR
#undef CROW_TOKEN
#undef CROW_IS_URL_CHAR
//#undef CROW_IS_HOST_CHAR
#undef CROW_STRICT_CHECK
}
// clang-format on
crow
The main namespace of the library. In this namespace is defined the most important classes and functi...
crow::http_parser_settings
Definition http_parser_merged.h:181
crow::http_parser
Definition http_parser_merged.h:148
crow::http_parser::http_major
unsigned char http_major
Definition http_parser_merged.h:163
crow::http_parser::flags
unsigned int flags
Definition http_parser_merged.h:150
crow::http_parser::data
void * data
Definition http_parser_merged.h:176