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pigweed / third_party / github / zephyrproject-rtos / zephyr / b867f0e8a629880e9a1536c084d8f3785a42754b / . / subsys / net / lib / http / http_parser.c
blob: 8626b101cda495c130c1e648fe9b0ed8ab183397 [file] [log] [blame]
/* SPDX-License-Identifier: MIT */
/* Based on src/http/ngx_http_parse.c from NGINX copyright Igor Sysoev
*
* Additional changes are licensed under the same terms as NGINX and
* copyright Joyent, Inc. and other Node contributors. All rights reserved.
*
* 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.
*/
#include <zephyr/net/http_parser.h>
#include <zephyr/sys/__assert.h>
#include <stddef.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <zephyr/toolchain.h>
#ifndef ULLONG_MAX
# define ULLONG_MAX ((uint64_t) -1) /* 2^64-1 */
#endif
#ifndef MIN
# define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
#ifndef ARRAY_SIZE
# define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
#endif
#ifndef BIT_AT
# define BIT_AT(a, i) \
(!!((unsigned int) (a)[(unsigned int) (i) >> 3] & \
(1 << ((unsigned int) (i) & 7))))
#endif
#ifndef ELEM_AT
# define ELEM_AT(a, i, v) ((unsigned int) (i) < ARRAY_SIZE(a) ? (a)[(i)] : (v))
#endif
#define SET_ERRNO(e) (parser->http_errno = (e))
#define CURRENT_STATE() p_state
#define UPDATE_STATE(V) (p_state = (enum state)(V))
#ifdef __GNUC__
# define LIKELY(X) __builtin_expect(!!(X), 1)
# define UNLIKELY(X) __builtin_expect(!!(X), 0)
#else
# define LIKELY(X) (X)
# define UNLIKELY(X) (X)
#endif
/* Set the mark FOR; non-destructive if mark is already set */
#define 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 HTTP_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. HTTP_MAX_HEADER_SIZE is still far bigger
* than any reasonable request or response so this should never affect
* day-to-day operation.
*/
static inline
int count_header_size(struct http_parser *parser, int bytes)
{
parser->nread += bytes;
if (UNLIKELY(parser->nread > (HTTP_MAX_HEADER_SIZE))) {
parser->http_errno = HPE_HEADER_OVERFLOW;
return -1;
}
return 0;
}
#define PROXY_CONNECTION "proxy-connection"
#define CONNECTION "connection"
#define CONTENT_LENGTH "content-length"
#define TRANSFER_ENCODING "transfer-encoding"
#define UPGRADE "upgrade"
#define CHUNKED "chunked"
#define KEEP_ALIVE "keep-alive"
#define CLOSE "close"
static const
char *method_strings[] = {"DELETE", "GET", "HEAD", "POST", "PUT", "CONNECT",
"OPTIONS", "TRACE", "COPY", "LOCK", "MKCOL", "MOVE",
"PROPFIND", "PROPPATCH", "SEARCH", "UNLOCK", "BIND",
"REBIND", "UNBIND", "ACL", "REPORT", "MKACTIVITY",
"CHECKOUT", "MERGE", "M-SEARCH", "NOTIFY",
"SUBSCRIBE", "UNSUBSCRIBE", "PATCH", "PURGE",
"MKCALENDAR", "LINK", "UNLINK"};
/* 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
};
#define 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_transfer_encoding,
h_upgrade,
h_matching_transfer_encoding_chunked,
h_matching_connection_token_start,
h_matching_connection_keep_alive,
h_matching_connection_close,
h_matching_connection_upgrade,
h_matching_connection_token,
h_transfer_encoding_chunked,
h_connection_keep_alive,
h_connection_close,
h_connection_upgrade
};
static inline
int cb_notify(struct http_parser *parser, enum state *current_state, http_cb cb,
int cb_error, size_t *parsed, size_t already_parsed)
{
__ASSERT_NO_MSG(HTTP_PARSER_ERRNO(parser) == HPE_OK);
if (cb == NULL) {
return 0;
}
parser->state = *current_state;
if (UNLIKELY(cb(parser) != 0)) {
SET_ERRNO(cb_error);
}
*current_state = parser->state;
/* We either errored above or got paused; get out */
if (UNLIKELY(HTTP_PARSER_ERRNO(parser) != HPE_OK)) {
*parsed = already_parsed;
return -HTTP_PARSER_ERRNO(parser);
}
return 0;
}
static inline
int cb_data(struct http_parser *parser, http_data_cb cb, int cb_error,
enum state *current_state, size_t *parsed, size_t already_parsed,
const char **mark, size_t len)
{
int rc;
__ASSERT_NO_MSG(HTTP_PARSER_ERRNO(parser) == HPE_OK);
if (*mark == NULL) {
return 0;
}
if (cb == NULL) {
goto lb_end;
}
parser->state = *current_state;
rc = cb(parser, *mark, len);
if (UNLIKELY(rc != 0)) {
SET_ERRNO(cb_error);
}
*current_state = parser->state;
/* We either errored above or got paused; get out */
if (UNLIKELY(HTTP_PARSER_ERRNO(parser) != HPE_OK)) {
*parsed = already_parsed;
return -HTTP_PARSER_ERRNO(parser);
}
lb_end:
*mark = NULL;
return 0;
}
/* Macros for character classes; depends on strict-mode */
#define CR '\r'
#define LF '\n'
#define LOWER(c) (unsigned char)(c | 0x20)
#define IS_ALPHA(c) (LOWER(c) >= 'a' && LOWER(c) <= 'z')
#define IS_NUM(c) ((c) >= '0' && (c) <= '9')
#define IS_ALPHANUM(c) (IS_ALPHA(c) || IS_NUM(c))
#define IS_HEX(c) (IS_NUM(c) || (LOWER(c) >= 'a' && LOWER(c) <= 'f'))
#define IS_MARK(c) ((c) == '-' || (c) == '_' || (c) == '.' || \
(c) == '!' || (c) == '~' || (c) == '*' || \
(c) == '\'' || (c) == '(' || (c) == ')')
#define IS_USERINFO_CHAR(c) (IS_ALPHANUM(c) || IS_MARK(c) || (c) == '%' || \
(c) == ';' || (c) == ':' || (c) == '&' || \
(c) == '=' || (c) == '+' || (c) == '$' || \
(c) == ',')
#define STRICT_TOKEN(c) (tokens[(unsigned char)c])
#ifdef HTTP_PARSER_STRICT
#define TOKEN(c) (tokens[(unsigned char)c])
#define IS_HOST_CHAR(c) (IS_ALPHANUM(c) || (c) == '.' || (c) == '-')
#else
#define TOKEN(c) ((c == ' ') ? ' ' : tokens[(unsigned char)c])
#define IS_HOST_CHAR(c) \
(IS_ALPHANUM(c) || (c) == '.' || (c) == '-' || (c) == '_')
#endif
/**
* Verify that a char is a valid visible (printable) US-ASCII
* character or %x80-FF
**/
#define IS_HEADER_CHAR(ch) \
(ch == CR || ch == LF || ch == 9 || \
((unsigned char)ch > 31 && ch != 127))
#define start_state (parser->type == HTTP_REQUEST ? s_start_req : s_start_res)
#ifdef HTTP_PARSER_STRICT
static inline
int strict_check(struct http_parser *parser, int c)
{
if (c) {
parser->http_errno = HPE_STRICT;
return -1;
}
return 0;
}
# define NEW_MESSAGE() (http_should_keep_alive(parser) ? start_state : s_dead)
#else
static inline
int strict_check(struct http_parser *parser, int c)
{
(void)parser;
(void)c;
return 0;
}
# define NEW_MESSAGE() start_state
#endif
static struct {
const char *name;
const char *description;
} http_strerror_tab[] = {
{"HPE_OK", "success"},
{"HPE_CB_message_begin", "the on_message_begin callback failed"},
{"HPE_CB_url", "the on_url callback failed"},
{"HPE_CB_header_field", "the on_header_field callback failed"},
{"HPE_CB_header_value", "the on_header_value callback failed"},
{"HPE_CB_headers_complete", "the on_headers_complete callback failed"},
{"HPE_CB_body", "the on_body callback failed"},
{"HPE_CB_message_complete", "the on_message_complete callback failed"},
{"HPE_CB_status", "the on_status callback failed"},
{"HPE_CB_chunk_header", "the on_chunk_header callback failed"},
{"HPE_CB_chunk_complete", "the on_chunk_complete callback failed"},
{"HPE_INVALID_EOF_STATE", "stream ended at an unexpected time"},
{"HPE_HEADER_OVERFLOW", "too many header bytes seen; "
"overflow detected"},
{"HPE_CLOSED_CONNECTION", "data received after completed connection: "
"close message"},
{"HPE_INVALID_VERSION", "invalid HTTP version"},
{"HPE_INVALID_STATUS", "invalid HTTP status code"},
{"HPE_INVALID_METHOD", "invalid HTTP method"},
{"HPE_INVALID_URL", "invalid URL"},
{"HPE_INVALID_HOST", "invalid host"},
{"HPE_INVALID_PORT", "invalid port"},
{"HPE_INVALID_PATH", "invalid path"},
{"HPE_INVALID_QUERY_STRING", "invalid query string"},
{"HPE_INVALID_FRAGMENT", "invalid fragment"},
{"HPE_LF_EXPECTED", "LF character expected"},
{"HPE_INVALID_HEADER_TOKEN", "invalid character in header"},
{"HPE_INVALID_CONTENT_LENGTH", "invalid character in content-length "
"header"},
{"HPE_UNEXPECTED_CONTENT_LENGTH", "unexpected content-length header"},
{"HPE_INVALID_CHUNK_SIZE", "invalid character in chunk size header"},
{"HPE_INVALID_CONSTANT", "invalid constant string"},
{"HPE_INVALID_INTERNAL_STATE", "encountered unexpected internal state"},
{"HPE_STRICT", "strict mode assertion failed"},
{"HPE_PAUSED", "parser is paused"},
{"HPE_UNKNOWN", "an unknown error occurred"}
};
int http_message_needs_eof(const struct http_parser *parser);
static
int parser_header_state(struct http_parser *parser, char ch, char c)
{
int cond1;
switch (parser->header_state) {
case h_general:
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++;
cond1 = parser->index > sizeof(CONNECTION) - 1;
if (cond1 || c != CONNECTION[parser->index]) {
parser->header_state = h_general;
} else if (parser->index == sizeof(CONNECTION) - 2) {
parser->header_state = h_connection;
}
break;
/* proxy-connection */
case h_matching_proxy_connection:
parser->index++;
cond1 = parser->index > sizeof(PROXY_CONNECTION) - 1;
if (cond1 || c != PROXY_CONNECTION[parser->index]) {
parser->header_state = h_general;
} else if (parser->index == sizeof(PROXY_CONNECTION) - 2) {
parser->header_state = h_connection;
}
break;
/* content-length */
case h_matching_content_length:
parser->index++;
cond1 = parser->index > sizeof(CONTENT_LENGTH) - 1;
if (cond1 || c != CONTENT_LENGTH[parser->index]) {
parser->header_state = h_general;
} else if (parser->index == sizeof(CONTENT_LENGTH) - 2) {
parser->header_state = h_content_length;
}
break;
/* transfer-encoding */
case h_matching_transfer_encoding:
parser->index++;
cond1 = parser->index > sizeof(TRANSFER_ENCODING) - 1;
if (cond1 || c != TRANSFER_ENCODING[parser->index]) {
parser->header_state = h_general;
} else if (parser->index == sizeof(TRANSFER_ENCODING) - 2) {
parser->header_state = h_transfer_encoding;
}
break;
/* upgrade */
case h_matching_upgrade:
parser->index++;
cond1 = parser->index > sizeof(UPGRADE) - 1;
if (cond1 || c != UPGRADE[parser->index]) {
parser->header_state = h_general;
} else if (parser->index == sizeof(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_NO_MSG(0 && "Unknown header_state");
break;
}
return 0;
}
static
int header_states(struct http_parser *parser, const char *data, size_t len,
const char **ptr, enum state *p_state,
enum header_states *header_state, char ch, char c)
{
enum header_states h_state = *header_state;
const char *p = *ptr;
int cond1;
switch (h_state) {
case h_general: {
size_t limit = data + len - p;
const char *p_cr;
const char *p_lf;
limit = MIN(limit, HTTP_MAX_HEADER_SIZE);
p_cr = (const char *)memchr(p, CR, limit);
p_lf = (const char *)memchr(p, LF, limit);
if (p_cr != NULL) {
if (p_lf != NULL && p_cr >= p_lf) {
p = p_lf;
} else {
p = p_cr;
}
} else if (UNLIKELY(p_lf != NULL)) {
p = p_lf;
} else {
p = data + len;
}
--p;
break;
}
case h_connection:
case h_transfer_encoding:
__ASSERT_NO_MSG(0 && "Shouldn't get here.");
break;
case h_content_length: {
uint64_t t;
uint64_t value;
if (ch == ' ') {
break;
}
if (UNLIKELY(!IS_NUM(ch))) {
SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
parser->header_state = h_state;
return -1;
}
t = parser->content_length;
t *= 10U;
t += ch - '0';
/* Overflow? Test against a conservative limit for simplicity */
value = (ULLONG_MAX - 10) / 10;
if (UNLIKELY(value < parser->content_length)) {
SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
parser->header_state = h_state;
return -1;
}
parser->content_length = t;
break;
}
/* Transfer-Encoding: chunked */
case h_matching_transfer_encoding_chunked:
parser->index++;
cond1 = parser->index > sizeof(CHUNKED) - 1;
if (cond1 || c != CHUNKED[parser->index]) {
h_state = h_general;
} else if (parser->index == sizeof(CHUNKED) - 2) {
h_state = h_transfer_encoding_chunked;
}
break;
case h_matching_connection_token_start:
/* looking for 'Connection: keep-alive' */
if (c == 'k') {
h_state = h_matching_connection_keep_alive;
/* looking for 'Connection: close' */
} else if (c == 'c') {
h_state = h_matching_connection_close;
} else if (c == 'u') {
h_state = h_matching_connection_upgrade;
} else if (STRICT_TOKEN(c)) {
h_state = h_matching_connection_token;
} else if (c == ' ' || c == '\t') {
/* Skip lws */
} else {
h_state = h_general;
}
break;
/* looking for 'Connection: keep-alive' */
case h_matching_connection_keep_alive:
parser->index++;
cond1 = parser->index > sizeof(KEEP_ALIVE) - 1;
if (cond1 || c != KEEP_ALIVE[parser->index]) {
h_state = h_matching_connection_token;
} else if (parser->index == sizeof(KEEP_ALIVE) - 2) {
h_state = h_connection_keep_alive;
}
break;
/* looking for 'Connection: close' */
case h_matching_connection_close:
parser->index++;
cond1 = parser->index > sizeof(CLOSE) - 1;
if (cond1 || c != CLOSE[parser->index]) {
h_state = h_matching_connection_token;
} else if (parser->index == sizeof(CLOSE) - 2) {
h_state = h_connection_close;
}
break;
/* looking for 'Connection: upgrade' */
case h_matching_connection_upgrade:
parser->index++;
cond1 = parser->index > sizeof(UPGRADE) - 1;
if (cond1 || c != UPGRADE[parser->index]) {
h_state = h_matching_connection_token;
} else if (parser->index == sizeof(UPGRADE) - 2) {
h_state = h_connection_upgrade;
}
break;
case h_matching_connection_token:
if (ch == ',') {
h_state = h_matching_connection_token_start;
parser->index = 0U;
}
break;
case h_transfer_encoding_chunked:
if (ch != ' ') {
h_state = h_general;
}
break;
case h_connection_keep_alive:
case h_connection_close:
case h_connection_upgrade:
if (ch == ',') {
if (h_state == h_connection_keep_alive) {
parser->flags |= F_CONNECTION_KEEP_ALIVE;
} else if (h_state == h_connection_close) {
parser->flags |= F_CONNECTION_CLOSE;
} else if (h_state == h_connection_upgrade) {
parser->flags |= F_CONNECTION_UPGRADE;
}
h_state = h_matching_connection_token_start;
parser->index = 0U;
} else if (ch != ' ') {
h_state = h_matching_connection_token;
}
break;
default:
*p_state = s_header_value;
h_state = h_general;
break;
}
*header_state = h_state;
*ptr = p;
return 0;
}
static
int zero_content_length(struct http_parser *parser,
const struct http_parser_settings *settings,
enum state *current_state, size_t *parsed,
const char *p, const char *data)
{
enum state p_state = *current_state;
int rc;
if (parser->content_length == 0U) {
/* Content-Length header given but zero:
* Content-Length: 0\r\n
*/
UPDATE_STATE(NEW_MESSAGE());
rc = cb_notify(parser, &p_state, settings->on_message_complete,
HPE_CB_message_complete, parsed, p - data + 1);
if (rc != 0) {
return rc;
}
} else if (parser->content_length != ULLONG_MAX) {
/* Content-Length header given and
* non-zero
*/
UPDATE_STATE(s_body_identity);
} else {
if (!http_message_needs_eof(parser)) {
/* Assume content-length 0 -
* read the next
*/
UPDATE_STATE(NEW_MESSAGE());
rc = cb_notify(parser, &p_state,
settings->on_message_complete,
HPE_CB_message_complete, parsed,
p - data + 1);
if (rc != 0) {
return rc;
}
} else {
/* Read body until EOF */
UPDATE_STATE(s_body_identity_eof);
}
}
*current_state = p_state;
return 0;
}
static
int parser_execute(struct http_parser *parser,
const struct http_parser_settings *settings,
const char *data, size_t len, size_t *parsed)
{
const unsigned int lenient = parser->lenient_http_headers;
enum state p_state = (enum state) parser->state;
const char *p = data;
const char *header_field_mark = 0;
const char *header_value_mark = 0;
const char *url_mark = 0;
const char *body_mark = 0;
const char *status_mark = 0;
int8_t unhex_val;
int rc;
char ch;
char c;
*parsed = 0;
/* We're in an error state. Don't bother doing anything. */
if (HTTP_PARSER_ERRNO(parser) != HPE_OK) {
return 0;
}
if (len == 0) {
switch (CURRENT_STATE()) {
case s_body_identity_eof:
/* Use of CALLBACK_NOTIFY() here would erroneously
* return 1 byte read if
* we got paused.
*/
cb_notify(parser, &p_state,
settings->on_message_complete,
HPE_CB_message_complete, parsed, p - data);
return 0;
case s_dead:
case s_start_req_or_res:
case s_start_res:
case s_start_req:
return 0;
default:
SET_ERRNO(HPE_INVALID_EOF_STATE);
return 1;
}
}
if (CURRENT_STATE() == s_header_field) {
header_field_mark = data;
}
if (CURRENT_STATE() == s_header_value) {
header_value_mark = data;
}
switch (CURRENT_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:
case s_req_fragment_start:
case s_req_fragment:
url_mark = data;
break;
case s_res_status:
status_mark = data;
break;
default:
break;
}
for (p = data; p != data + len; p++) {
ch = *p;
if (PARSING_HEADER(CURRENT_STATE())) {
rc = count_header_size(parser, 1);
if (rc != 0) {
goto error;
}
}
reexecute:
switch (CURRENT_STATE()) {
case s_dead:
/* this state is used after a 'Connection: close'
* message
* the parser will error out if it reads another message
*/
if (LIKELY(ch == CR || ch == LF)) {
break;
}
SET_ERRNO(HPE_CLOSED_CONNECTION);
goto error;
case s_start_req_or_res: {
if (ch == CR || ch == LF) {
break;
}
parser->flags = 0U;
parser->content_length = ULLONG_MAX;
if (ch == 'H') {
UPDATE_STATE(s_res_or_resp_H);
rc = cb_notify(parser, &p_state,
settings->on_message_begin,
HPE_CB_message_begin,
parsed, p - data + 1);
if (rc != 0) {
return rc;
}
} else {
parser->type = HTTP_REQUEST;
UPDATE_STATE(s_start_req);
goto reexecute;
}
break;
}
case s_res_or_resp_H:
if (ch == 'T') {
parser->type = HTTP_RESPONSE;
UPDATE_STATE(s_res_HT);
} else {
if (UNLIKELY(ch != 'E')) {
SET_ERRNO(HPE_INVALID_CONSTANT);
goto error;
}
parser->type = HTTP_REQUEST;
parser->method = HTTP_HEAD;
parser->index = 2U;
UPDATE_STATE(s_req_method);
}
break;
case s_start_res: {
parser->flags = 0U;
parser->content_length = ULLONG_MAX;
switch (ch) {
case 'H':
UPDATE_STATE(s_res_H);
break;
case CR:
case LF:
break;
default:
SET_ERRNO(HPE_INVALID_CONSTANT);
goto error;
}
rc = cb_notify(parser, &p_state,
settings->on_message_begin,
HPE_CB_message_begin, parsed,
p - data + 1);
if (rc != 0) {
return rc;
}
break;
}
case s_res_H:
rc = strict_check(parser, ch != 'T');
if (rc != 0) {
goto error;
}
UPDATE_STATE(s_res_HT);
break;
case s_res_HT:
rc = strict_check(parser, ch != 'T');
if (rc != 0) {
goto error;
}
UPDATE_STATE(s_res_HTT);
break;
case s_res_HTT:
rc = strict_check(parser, ch != 'P');
if (rc != 0) {
goto error;
}
UPDATE_STATE(s_res_HTTP);
break;
case s_res_HTTP:
rc = strict_check(parser, ch != '/');
if (rc != 0) {
goto error;
}
UPDATE_STATE(s_res_first_http_major);
break;
case s_res_first_http_major:
if (UNLIKELY(ch < '0' || ch > '9')) {
SET_ERRNO(HPE_INVALID_VERSION);
goto error;
}
parser->http_major = ch - '0';
UPDATE_STATE(s_res_http_major);
break;
/* major HTTP version or dot */
case s_res_http_major: {
if (ch == '.') {
UPDATE_STATE(s_res_first_http_minor);
break;
}
if (!IS_NUM(ch)) {
SET_ERRNO(HPE_INVALID_VERSION);
goto error;
}
parser->http_major *= 10U;
parser->http_major += ch - '0';
if (UNLIKELY(parser->http_major > 999)) {
SET_ERRNO(HPE_INVALID_VERSION);
goto error;
}
break;
}
/* first digit of minor HTTP version */
case s_res_first_http_minor:
if (UNLIKELY(!IS_NUM(ch))) {
SET_ERRNO(HPE_INVALID_VERSION);
goto error;
}
parser->http_minor = ch - '0';
UPDATE_STATE(s_res_http_minor);
break;
/* minor HTTP version or end of request line */
case s_res_http_minor: {
if (ch == ' ') {
UPDATE_STATE(s_res_first_status_code);
break;
}
if (UNLIKELY(!IS_NUM(ch))) {
SET_ERRNO(HPE_INVALID_VERSION);
goto error;
}
parser->http_minor *= 10U;
parser->http_minor += ch - '0';
if (UNLIKELY(parser->http_minor > 999)) {
SET_ERRNO(HPE_INVALID_VERSION);
goto error;
}
break;
}
case s_res_first_status_code: {
if (!IS_NUM(ch)) {
if (ch == ' ') {
break;
}
SET_ERRNO(HPE_INVALID_STATUS);
goto error;
}
parser->status_code = ch - '0';
UPDATE_STATE(s_res_status_code);
break;
}
case s_res_status_code: {
if (!IS_NUM(ch)) {
/* Numeric status only */
if ((ch == CR) || (ch == LF)) {
const char *no_status_txt = "";
rc = cb_data(parser,
settings->on_status,
HPE_CB_status, &p_state, parsed,
p - data + 1, &no_status_txt, 0);
if (rc != 0) {
return rc;
}
}
switch (ch) {
case ' ':
UPDATE_STATE(s_res_status_start);
break;
case CR:
UPDATE_STATE(s_res_line_almost_done);
break;
case LF:
UPDATE_STATE(s_header_field_start);
break;
default:
SET_ERRNO(HPE_INVALID_STATUS);
goto error;
}
break;
}
parser->status_code *= 10U;
parser->status_code += ch - '0';
if (UNLIKELY(parser->status_code > 999)) {
SET_ERRNO(HPE_INVALID_STATUS);
goto error;
}
break;
}
case s_res_status_start: {
if (!status_mark && ((ch == CR) || (ch == LF))) {
/* Numeric status only */
const char *no_status_txt = "";
rc = cb_data(parser,
settings->on_status,
HPE_CB_status, &p_state, parsed,
p - data + 1, &no_status_txt, 0);
if (rc != 0) {
return rc;
}
}
if (ch == CR) {
UPDATE_STATE(s_res_line_almost_done);
break;
}
if (ch == LF) {
UPDATE_STATE(s_header_field_start);
break;
}
MARK(status);
UPDATE_STATE(s_res_status);
parser->index = 0U;
break;
}
case s_res_status:
if (ch == CR) {
UPDATE_STATE(s_res_line_almost_done);
rc = cb_data(parser, settings->on_status,
HPE_CB_status, &p_state, parsed,
p - data + 1, &status_mark,
p - status_mark);
if (rc != 0) {
return rc;
}
break;
}
if (ch == LF) {
UPDATE_STATE(s_header_field_start);
rc = cb_data(parser, settings->on_status,
HPE_CB_status, &p_state, parsed,
p - data + 1, &status_mark,
p - status_mark);
if (rc != 0) {
return rc;
}
break;
}
break;
case s_res_line_almost_done:
rc = strict_check(parser, ch != LF);
if (rc != 0) {
goto error;
}
UPDATE_STATE(s_header_field_start);
break;
case s_start_req: {
if (ch == CR || ch == LF) {
break;
}
parser->flags = 0U;
parser->content_length = ULLONG_MAX;
if (UNLIKELY(!IS_ALPHA(ch))) {
SET_ERRNO(HPE_INVALID_METHOD);
goto error;
}
parser->method = (enum http_method) 0;
parser->index = 1U;
switch (ch) {
case 'A':
parser->method = HTTP_ACL;
break;
case 'B':
parser->method = HTTP_BIND;
break;
case 'C':
parser->method = HTTP_CONNECT;
/* or COPY, CHECKOUT */
break;
case 'D':
parser->method = HTTP_DELETE;
break;
case 'G':
parser->method = HTTP_GET;
break;
case 'H':
parser->method = HTTP_HEAD;
break;
case 'L':
parser->method = HTTP_LOCK; /* or LINK */
break;
case 'M':
parser->method =
HTTP_MKCOL;
/* or MOVE, MKACTIVITY, MERGE, M-SEARCH,
* MKCALENDAR
*/
break;
case 'N':
parser->method = HTTP_NOTIFY;
break;
case 'O':
parser->method = HTTP_OPTIONS;
break;
case 'P':
parser->method = HTTP_POST;
/* or PROPFIND|PROPPATCH|PUT|PATCH|PURGE */
break;
case 'R':
parser->method = HTTP_REPORT; /* or REBIND */
break;
case 'S':
parser->method = HTTP_SUBSCRIBE; /* or SEARCH */
break;
case 'T':
parser->method = HTTP_TRACE;
break;
case 'U':
parser->method = HTTP_UNLOCK;
/* or UNSUBSCRIBE, UNBIND, UNLINK */
break;
default:
SET_ERRNO(HPE_INVALID_METHOD);
goto error;
}
UPDATE_STATE(s_req_method);
rc = cb_notify(parser, &p_state,
settings->on_message_begin,
HPE_CB_message_begin, parsed,
p - data + 1);
if (rc != 0) {
return rc;
}
break;
}
case s_req_method: {
const char *matcher;
if (UNLIKELY(ch == '\0')) {
SET_ERRNO(HPE_INVALID_METHOD);
goto error;
}
matcher = method_strings[parser->method];
if (ch == ' ' && matcher[parser->index] == '\0') {
UPDATE_STATE(s_req_spaces_before_url);
} else if (ch == matcher[parser->index]) {
; /* nada */
} else if (IS_ALPHA(ch)) {
uint64_t sw_option = parser->method << 16 |
parser->index << 8 | ch;
switch (sw_option) {
case (HTTP_POST << 16 | 1 << 8 | 'U'):
parser->method = HTTP_PUT;
break;
case (HTTP_POST << 16 | 1 << 8 | 'A'):
parser->method = HTTP_PATCH;
break;
case (HTTP_CONNECT << 16 | 1 << 8 | 'H'):
parser->method = HTTP_CHECKOUT;
break;
case (HTTP_CONNECT << 16 | 2 << 8 | 'P'):
parser->method = HTTP_COPY;
break;
case (HTTP_MKCOL << 16 | 1 << 8 | 'O'):
parser->method = HTTP_MOVE;
break;
case (HTTP_MKCOL << 16 | 1 << 8 | 'E'):
parser->method = HTTP_MERGE;
break;
case (HTTP_MKCOL << 16 | 2 << 8 | 'A'):
parser->method = HTTP_MKACTIVITY;
break;
case (HTTP_MKCOL << 16 | 3 << 8 | 'A'):
parser->method = HTTP_MKCALENDAR;
break;
case (HTTP_SUBSCRIBE << 16 | 1 << 8 | 'E'):
parser->method = HTTP_SEARCH;
break;
case (HTTP_REPORT << 16 | 2 << 8 | 'B'):
parser->method = HTTP_REBIND;
break;
case (HTTP_POST << 16 | 1 << 8 | 'R'):
parser->method = HTTP_PROPFIND;
break;
case (HTTP_PROPFIND << 16 | 4 << 8 | 'P'):
parser->method = HTTP_PROPPATCH;
break;
case (HTTP_PUT << 16 | 2 << 8 | 'R'):
parser->method = HTTP_PURGE;
break;
case (HTTP_LOCK << 16 | 1 << 8 | 'I'):
parser->method = HTTP_LINK;
break;
case (HTTP_UNLOCK << 16 | 2 << 8 | 'S'):
parser->method = HTTP_UNSUBSCRIBE;
break;
case (HTTP_UNLOCK << 16 | 2 << 8 | 'B'):
parser->method = HTTP_UNBIND;
break;
case (HTTP_UNLOCK << 16 | 3 << 8 | 'I'):
parser->method = HTTP_UNLINK;
break;
default:
parser->http_errno = HPE_INVALID_METHOD;
goto error;
}
} else if (ch == '-' &&
parser->index == 1U &&
parser->method == HTTP_MKCOL) {
parser->method = HTTP_MSEARCH;
} else {
SET_ERRNO(HPE_INVALID_METHOD);
goto error;
}
++parser->index;
break;
}
case s_req_spaces_before_url: {
if (ch == ' ') {
break;
}
MARK(url);
if (parser->method == HTTP_CONNECT) {
UPDATE_STATE(s_req_server_start);
}
UPDATE_STATE(parse_url_char(CURRENT_STATE(), ch));
if (UNLIKELY(CURRENT_STATE() == s_dead)) {
SET_ERRNO(HPE_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:
SET_ERRNO(HPE_INVALID_URL);
goto error;
default:
UPDATE_STATE
(parse_url_char(CURRENT_STATE(), ch));
if (UNLIKELY(CURRENT_STATE() == s_dead)) {
SET_ERRNO(HPE_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:
case s_req_fragment_start:
case s_req_fragment: {
switch (ch) {
case ' ':
UPDATE_STATE(s_req_http_start);
rc = cb_data(parser, settings->on_url,
HPE_CB_url, &p_state, parsed,
p - data + 1, &url_mark,
p - url_mark);
if (rc != 0) {
return rc;
}
break;
case CR:
case LF:
parser->http_major = 0U;
parser->http_minor = 9U;
UPDATE_STATE((ch == CR) ?
s_req_line_almost_done :
s_header_field_start);
rc = cb_data(parser, settings->on_url,
HPE_CB_url, &p_state, parsed,
p - data + 1, &url_mark,
p - url_mark);
if (rc != 0) {
return rc;
}
break;
default:
UPDATE_STATE
(parse_url_char(CURRENT_STATE(), ch));
if (UNLIKELY(CURRENT_STATE() == s_dead)) {
SET_ERRNO(HPE_INVALID_URL);
goto error;
}
}
break;
}
case s_req_http_start:
switch (ch) {
case 'H':
UPDATE_STATE(s_req_http_H);
break;
case ' ':
break;
default:
SET_ERRNO(HPE_INVALID_CONSTANT);
goto error;
}
break;
case s_req_http_H:
rc = strict_check(parser, ch != 'T');
if (rc != 0) {
goto error;
}
UPDATE_STATE(s_req_http_HT);
break;
case s_req_http_HT:
rc = strict_check(parser, ch != 'T');
if (rc != 0) {
goto error;
}
UPDATE_STATE(s_req_http_HTT);
break;
case s_req_http_HTT:
rc = strict_check(parser, ch != 'P');
if (rc != 0) {
goto error;
}
UPDATE_STATE(s_req_http_HTTP);
break;
case s_req_http_HTTP:
rc = strict_check(parser, ch != '/');
if (rc != 0) {
goto error;
}
UPDATE_STATE(s_req_first_http_major);
break;
/* first digit of major HTTP version */
case s_req_first_http_major:
if (UNLIKELY(ch < '1' || ch > '9')) {
SET_ERRNO(HPE_INVALID_VERSION);
goto error;
}
parser->http_major = ch - '0';
UPDATE_STATE(s_req_http_major);
break;
/* major HTTP version or dot */
case s_req_http_major: {
if (ch == '.') {
UPDATE_STATE(s_req_first_http_minor);
break;
}
if (UNLIKELY(!IS_NUM(ch))) {
SET_ERRNO(HPE_INVALID_VERSION);
goto error;
}
parser->http_major *= 10U;
parser->http_major += ch - '0';
if (UNLIKELY(parser->http_major > 999)) {
SET_ERRNO(HPE_INVALID_VERSION);
goto error;
}
break;
}
/* first digit of minor HTTP version */
case s_req_first_http_minor:
if (UNLIKELY(!IS_NUM(ch))) {
SET_ERRNO(HPE_INVALID_VERSION);
goto error;
}
parser->http_minor = ch - '0';
UPDATE_STATE(s_req_http_minor);
break;
/* minor HTTP version or end of request line */
case s_req_http_minor: {
if (ch == CR) {
UPDATE_STATE(s_req_line_almost_done);
break;
}
if (ch == LF) {
UPDATE_STATE(s_header_field_start);
break;
}
/* XXX allow spaces after digit? */
if (UNLIKELY(!IS_NUM(ch))) {
SET_ERRNO(HPE_INVALID_VERSION);
goto error;
}
parser->http_minor *= 10U;
parser->http_minor += ch - '0';
if (UNLIKELY(parser->http_minor > 999)) {
SET_ERRNO(HPE_INVALID_VERSION);
goto error;
}
break;
}
/* end of request line */
case s_req_line_almost_done: {
if (UNLIKELY(ch != LF)) {
SET_ERRNO(HPE_LF_EXPECTED);
goto error;
}
UPDATE_STATE(s_header_field_start);
break;
}
case s_header_field_start: {
if (ch == CR) {
UPDATE_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
*/
UPDATE_STATE(s_headers_almost_done);
goto reexecute;
}
c = TOKEN(ch);
if (UNLIKELY(!c)) {
SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
goto error;
}
MARK(header_field);
parser->index = 0U;
UPDATE_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 = TOKEN(ch);
if (!c) {
break;
}
parser_header_state(parser, ch, c);
}
rc = count_header_size(parser, p - start);
if (rc != 0) {
goto error;
}
if (p == data + len) {
--p;
break;
}
if (ch == ':') {
UPDATE_STATE(s_header_value_discard_ws);
rc = cb_data(parser, settings->on_header_field,
HPE_CB_header_field, &p_state,
parsed, p - data + 1,
&header_field_mark,
p - header_field_mark);
if (rc != 0) {
return rc;
}
break;
}
SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
goto error;
}
case s_header_value_discard_ws:
if (ch == ' ' || ch == '\t') {
break;
}
if (ch == CR) {
UPDATE_STATE
(s_header_value_discard_ws_almost_done);
break;
}
if (ch == LF) {
UPDATE_STATE(s_header_value_discard_lws);
break;
}
__fallthrough;
case s_header_value_start: {
MARK(header_value);
UPDATE_STATE(s_header_value);
parser->index = 0U;
c = LOWER(ch);
switch (parser->header_state) {
case h_upgrade:
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_general;
}
break;
case h_content_length:
if (UNLIKELY(!IS_NUM(ch))) {
SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
goto error;
}
if (parser->flags & F_CONTENTLENGTH) {
SET_ERRNO
(HPE_UNEXPECTED_CONTENT_LENGTH);
goto error;
}
parser->flags |= F_CONTENTLENGTH;
parser->content_length = ch - '0';
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 == 'u') {
parser->header_state =
h_matching_connection_upgrade;
} else {
parser->header_state =
h_matching_connection_token;
}
break;
/* Multi-value `Connection` header */
case h_matching_connection_token_start:
break;
default:
parser->header_state = h_general;
break;
}
break;
}
case s_header_value: {
const char *start = p;
enum header_states h_state =
(enum header_states)parser->header_state;
for (; p != data + len; p++) {
ch = *p;
if (ch == CR) {
UPDATE_STATE(s_header_almost_done);
parser->header_state = h_state;
rc = cb_data(parser,
settings->on_header_value,
HPE_CB_header_value,
&p_state, parsed,
p - data + 1,
&header_value_mark,
p - header_value_mark);
if (rc != 0) {
return rc;
}
break;
}
if (ch == LF) {
UPDATE_STATE(s_header_almost_done);
rc = count_header_size(parser,
p - start);
if (rc != 0) {
goto error;
}
parser->header_state = h_state;
rc = cb_data(parser,
settings->on_header_value,
HPE_CB_header_value,
&p_state, parsed, p - data,
&header_value_mark,
p - header_value_mark);
if (rc != 0) {
return rc;
}
goto reexecute;
}
if (!lenient && !IS_HEADER_CHAR(ch)) {
SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
goto error;
}
c = LOWER(ch);
rc = header_states(parser, data, len, &p,
&p_state, &h_state, ch, c);
if (rc != 0) {
goto error;
}
}
parser->header_state = h_state;
rc = count_header_size(parser, p - start);
if (rc != 0) {
goto error;
}
if (p == data + len) {
--p;
}
break;
}
case s_header_almost_done: {
if (UNLIKELY(ch != LF)) {
SET_ERRNO(HPE_LF_EXPECTED);
goto error;
}
UPDATE_STATE(s_header_value_lws);
break;
}
case s_header_value_lws: {
if (ch == ' ' || ch == '\t') {
UPDATE_STATE(s_header_value_start);
goto 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;
case h_connection_upgrade:
parser->flags |= F_CONNECTION_UPGRADE;
break;
default:
break;
}
UPDATE_STATE(s_header_field_start);
goto reexecute;
}
case s_header_value_discard_ws_almost_done: {
rc = strict_check(parser, ch != LF);
if (rc != 0) {
goto error;
}
UPDATE_STATE(s_header_value_discard_lws);
break;
}
case s_header_value_discard_lws: {
if (ch == ' ' || ch == '\t') {
UPDATE_STATE(s_header_value_discard_ws);
break;
}
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_connection_upgrade:
parser->flags |= F_CONNECTION_UPGRADE;
break;
case h_transfer_encoding_chunked:
parser->flags |= F_CHUNKED;
break;
default:
break;
}
/* header value was empty */
MARK(header_value);
UPDATE_STATE(s_header_field_start);
rc = cb_data(parser, settings->on_header_value,
HPE_CB_header_value, &p_state, parsed,
p - data, &header_value_mark,
p - header_value_mark);
if (rc != 0) {
return rc;
}
goto reexecute;
}
case s_headers_almost_done: {
rc = strict_check(parser, ch != LF);
if (rc != 0) {
goto error;
}
if (parser->flags & F_TRAILING) {
/* End of a chunked request */
UPDATE_STATE(s_message_done);
rc = cb_notify(parser, &p_state,
settings->on_chunk_complete,
HPE_CB_chunk_complete, parsed,
p - data);
if (rc != 0) {
return rc;
}
goto reexecute;
}
/* Cannot use chunked encoding and a content-length
* header together per the HTTP specification.
*/
if ((parser->flags & F_CHUNKED) &&
(parser->flags & F_CONTENTLENGTH)) {
SET_ERRNO(HPE_UNEXPECTED_CONTENT_LENGTH);
goto error;
}
UPDATE_STATE(s_headers_done);
/* Set this here so that on_headers_complete() callbacks
* can see it
*/
int flags = (F_UPGRADE | F_CONNECTION_UPGRADE);
parser->upgrade =
((parser->flags & flags) == flags ||
parser->method == HTTP_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 receiving a
* response to a HEAD
* request.
*
* We'd like to use 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 = 1U;
__fallthrough;
case 1:
parser->flags |= F_SKIPBODY;
break;
default:
SET_ERRNO(HPE_CB_headers_complete);
parser->state = CURRENT_STATE();
*parsed = p - data;
return -HTTP_PARSER_ERRNO(parser);
}
}
if (HTTP_PARSER_ERRNO(parser) != HPE_OK) {
parser->state = CURRENT_STATE();
*parsed = p - data;
return -HTTP_PARSER_ERRNO(parser);
}
goto reexecute;
}
case s_headers_done: {
int hasBody;
rc = strict_check(parser, ch != LF);
if (rc != 0) {
goto error;
}
parser->nread = 0U;
hasBody = parser->flags & F_CHUNKED ||
(parser->content_length > 0 &&
parser->content_length != ULLONG_MAX);
if (parser->upgrade &&
(parser->method == HTTP_CONNECT ||
(parser->flags & F_SKIPBODY) || !hasBody)) {
/* Exit, the rest of the message is in a
* different protocol.
*/
UPDATE_STATE(NEW_MESSAGE());
rc = cb_notify(parser, &p_state,
settings->on_message_complete,
HPE_CB_message_complete, parsed,
p - data + 1);
if (rc != 0) {
return rc;
}
parser->state = CURRENT_STATE();
*parsed = p - data + 1;
return 0;
}
if (parser->flags & F_SKIPBODY) {
UPDATE_STATE(NEW_MESSAGE());
rc = cb_notify(parser, &p_state,
settings->on_message_complete,
HPE_CB_message_complete, parsed,
p - data + 1);
if (rc != 0) {
return rc;
}
} else if (parser->flags & F_CHUNKED) {
/* chunked encoding - ignore Content-Length
* header
*/
UPDATE_STATE(s_chunk_size_start);
} else {
rc = zero_content_length(parser, settings,
&p_state, parsed, p,
data);
if (rc != 0) {
return rc;
}
}
break;
}
case s_body_identity: {
uint64_t to_read = MIN(parser->content_length,
(uint64_t) ((data + len) - p));
__ASSERT_NO_MSG(parser->content_length != 0U
&& parser->content_length != ULLONG_MAX);
/* The difference between advancing content_length and
* p is because
* the latter will automatically 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.
*/
MARK(body);
parser->content_length -= to_read;
p += to_read - 1;
if (parser->content_length == 0U) {
UPDATE_STATE(s_message_done);
/* Mimic 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.
*/
rc = cb_data(parser, settings->on_body,
HPE_CB_body, &p_state, parsed,
p - data, &body_mark,
p - body_mark + 1);
if (rc != 0) {
return rc;
}
goto reexecute;
}
break;
}
/* read until EOF */
case s_body_identity_eof:
MARK(body);
p = data + len - 1;
break;
case s_message_done:
UPDATE_STATE(NEW_MESSAGE());
rc = cb_notify(parser, &p_state,
settings->on_message_complete,
HPE_CB_message_complete, parsed,
p - data + 1);
if (rc != 0) {
return rc;
}
if (parser->upgrade) {
/* Exit, the rest of the message is in a
* different protocol.
*/
parser->state = CURRENT_STATE();
*parsed = p - data + 1;
return 0;
}
break;
case s_chunk_size_start: {
__ASSERT_NO_MSG(parser->nread == 1U);
__ASSERT_NO_MSG(parser->flags & F_CHUNKED);
unhex_val = unhex[(unsigned char)ch];
if (UNLIKELY(unhex_val == -1)) {
SET_ERRNO(HPE_INVALID_CHUNK_SIZE);
goto error;
}
parser->content_length = unhex_val;
UPDATE_STATE(s_chunk_size);
break;
}
case s_chunk_size: {
uint64_t t;
__ASSERT_NO_MSG(parser->flags & F_CHUNKED);
if (ch == CR) {
UPDATE_STATE(s_chunk_size_almost_done);
break;
}
unhex_val = unhex[(unsigned char)ch];
if (unhex_val == -1) {
if (ch == ';' || ch == ' ') {
UPDATE_STATE(s_chunk_parameters);
break;
}
SET_ERRNO(HPE_INVALID_CHUNK_SIZE);
goto error;
}
t = parser->content_length;
t *= 16U;
t += unhex_val;
/* Overflow? Test against a conservative limit for
* simplicity.
*/
uint64_t ulong_value = (ULLONG_MAX - 16) / 16;
if (UNLIKELY(ulong_value < parser->content_length)) {
SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
goto error;
}
parser->content_length = t;
break;
}
case s_chunk_parameters: {
__ASSERT_NO_MSG(parser->flags & F_CHUNKED);
/* just ignore this shit. TODO check for overflow */
if (ch == CR) {
UPDATE_STATE(s_chunk_size_almost_done);
break;
}
break;
}
case s_chunk_size_almost_done: {
__ASSERT_NO_MSG(parser->flags & F_CHUNKED);
rc = strict_check(parser, ch != LF);
if (rc != 0) {
goto error;
}
parser->nread = 0U;
if (parser->content_length == 0U) {
parser->flags |= F_TRAILING;
UPDATE_STATE(s_header_field_start);
} else {
UPDATE_STATE(s_chunk_data);
}
rc = cb_notify(parser, &p_state,
settings->on_chunk_header,
HPE_CB_chunk_header, parsed,
p - data + 1);
if (rc != 0) {
return rc;
}
break;
}
case s_chunk_data: {
uint64_t to_read = MIN(parser->content_length,
(uint64_t) ((data + len) - p));
__ASSERT_NO_MSG(parser->flags & F_CHUNKED);
__ASSERT_NO_MSG(parser->content_length != 0U
&& parser->content_length != ULLONG_MAX);
/* See the explanation in s_body_identity for why the
* content
* length and data pointers are managed this way.
*/
MARK(body);
parser->content_length -= to_read;
p += to_read - 1;
if (parser->content_length == 0U) {
UPDATE_STATE(s_chunk_data_almost_done);
}
break;
}
case s_chunk_data_almost_done:
__ASSERT_NO_MSG(parser->flags & F_CHUNKED);
__ASSERT_NO_MSG(parser->content_length == 0U);
rc = strict_check(parser, ch != CR);
if (rc != 0) {
goto error;
}
UPDATE_STATE(s_chunk_data_done);
rc = cb_data(parser, settings->on_body, HPE_CB_body,
&p_state, parsed, p - data + 1, &body_mark,
p - body_mark);
if (rc != 0) {
return rc;
}
break;
case s_chunk_data_done:
__ASSERT_NO_MSG(parser->flags & F_CHUNKED);
rc = strict_check(parser, ch != LF);
if (rc != 0) {
goto error;
}
parser->nread = 0U;
UPDATE_STATE(s_chunk_size_start);
rc = cb_notify(parser, &p_state,
settings->on_chunk_complete,
HPE_CB_chunk_complete, parsed,
p - data + 1);
if (rc != 0) {
return rc;
}
break;
default:
__ASSERT_NO_MSG(0 && "unhandled state");
SET_ERRNO(HPE_INVALID_INTERNAL_STATE);
goto error;
}
}
/* Run callbacks for any marks that we have leftover after we ran our 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 CALLBACK_DATA() is meant to be run with a
* 'p'
* value that's in-bounds).
*/
__ASSERT_NO_MSG(((header_field_mark ? 1 : 0) +
(header_value_mark ? 1 : 0) +
(url_mark ? 1 : 0) +
(body_mark ? 1 : 0) +
(status_mark ? 1 : 0)) <= 1);
rc = cb_data(parser, settings->on_header_field, HPE_CB_header_field,
&p_state, parsed, p - data, &header_field_mark,
p - header_field_mark);
if (rc != 0) {
return rc;
}
rc = cb_data(parser, settings->on_header_value, HPE_CB_header_value,
&p_state, parsed, p - data, &header_value_mark,
p - header_value_mark);
if (rc != 0) {
return rc;
}
rc = cb_data(parser, settings->on_url, HPE_CB_url, &p_state, parsed,
p - data, &url_mark, p - url_mark);
if (rc != 0) {
return rc;
}
rc = cb_data(parser, settings->on_body, HPE_CB_body, &p_state, parsed,
p - data, &body_mark, p - body_mark);
if (rc != 0) {
return rc;
}
rc = cb_data(parser, settings->on_status, HPE_CB_status, &p_state,
parsed, p - data, &status_mark, p - status_mark);
if (rc != 0) {
return rc;
}
parser->state = CURRENT_STATE();
*parsed = len;
return 0;
error:
if (HTTP_PARSER_ERRNO(parser) == HPE_OK) {
SET_ERRNO(HPE_UNKNOWN);
}
parser->state = CURRENT_STATE();
*parsed = p - data; /* Error */
return -HTTP_PARSER_ERRNO(parser);
}
size_t http_parser_execute(struct http_parser *parser,
const struct http_parser_settings *settings,
const char *data, size_t len)
{
size_t parsed;
parser_execute(parser, settings, data, len, &parsed);
return parsed;
}
/* Does the parser need to see an EOF to find the end of the message? */
int http_message_needs_eof(const struct http_parser *parser)
{
if (parser->type == HTTP_REQUEST) {
return 0;
}
/* See RFC 2616 section 4.4 */
if (parser->status_code / 100 == 1U || /* 1xx e.g. Continue */
parser->status_code == 204U || /* No Content */
parser->status_code == 304U || /* Not Modified */
parser->flags & F_SKIPBODY) { /* response to a HEAD
* request
*/
return 0;
}
if ((parser->flags & F_CHUNKED) ||
parser->content_length != ULLONG_MAX) {
return 0;
}
return 1;
}
int http_should_keep_alive(const struct http_parser *parser)
{
if (parser->http_major > 0 && parser->http_minor > 0) {
/* HTTP/1.1 */
if (parser->flags & F_CONNECTION_CLOSE) {
return 0;
}
} else {
/* HTTP/1.0 or earlier */
if (!(parser->flags & F_CONNECTION_KEEP_ALIVE)) {
return 0;
}
}
return !http_message_needs_eof(parser);
}
const char *http_method_str(enum http_method m)
{
return ELEM_AT(method_strings, m, "<unknown>");
}
void http_parser_init(struct http_parser *parser, enum http_parser_type t)
{
void *data = parser->data; /* preserve application data */
(void)memset(parser, 0, sizeof(*parser));
parser->data = data;
parser->type = t;
parser->state =
(t == HTTP_REQUEST ? s_start_req :
(t == HTTP_RESPONSE ? s_start_res : s_start_req_or_res));
parser->http_errno = HPE_OK;
}
void http_parser_settings_init(struct http_parser_settings *settings)
{
(void)memset(settings, 0, sizeof(*settings));
}
const char *http_errno_name(enum http_errno err)
{
__ASSERT_NO_MSG(((size_t) err) < ARRAY_SIZE(http_strerror_tab));
return http_strerror_tab[err].name;
}
const char *http_errno_description(enum http_errno err)
{
__ASSERT_NO_MSG(((size_t) err) < ARRAY_SIZE(http_strerror_tab));
return http_strerror_tab[err].description;
}
void http_parser_pause(struct http_parser *parser, int paused)
{
/* Users should only be pausing/unpausing a parser that is not in an
* error
* state. In non-debug builds, there's not much that we can do about
* this
* other than ignore it.
*/
if (HTTP_PARSER_ERRNO(parser) == HPE_OK ||
HTTP_PARSER_ERRNO(parser) == HPE_PAUSED) {
SET_ERRNO((paused) ? HPE_PAUSED : HPE_OK);
} else {
__ASSERT_NO_MSG(0 && "Attempting to pause parser in error state");
}
}
int http_body_is_final(const struct http_parser *parser)
{
return parser->state == s_message_done;
}
unsigned long http_parser_version(void)
{
return HTTP_PARSER_VERSION_MAJOR * 0x10000 |
HTTP_PARSER_VERSION_MINOR * 0x00100 |
HTTP_PARSER_VERSION_PATCH * 0x00001;
}