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2060 lines
57 KiB
2060 lines
57 KiB
/* Based on src/http/ngx_http_parse.c from NGINX copyright Igor Sysoev
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*
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* Additional changes are licensed under the same terms as NGINX and
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* copyright Joyent, Inc. and other Node contributors. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "http_parser.h"
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#include <assert.h>
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#include <stddef.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#ifndef ULLONG_MAX
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# define ULLONG_MAX ((uint64_t) -1) /* 2^64-1 */
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#endif
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#ifndef MIN
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# define MIN(a,b) ((a) < (b) ? (a) : (b))
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#endif
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#if HTTP_PARSER_DEBUG
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#define SET_ERRNO(e) \
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do { \
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parser->http_errno = (e); \
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parser->error_lineno = __LINE__; \
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} while (0)
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#else
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#define SET_ERRNO(e) \
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do { \
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parser->http_errno = (e); \
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} while(0)
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#endif
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/* Run the notify callback FOR, returning ER if it fails */
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#define CALLBACK_NOTIFY_(FOR, ER) \
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do { \
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assert(HTTP_PARSER_ERRNO(parser) == HPE_OK); \
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\
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if (settings->on_##FOR) { \
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if (0 != settings->on_##FOR(parser)) { \
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SET_ERRNO(HPE_CB_##FOR); \
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} \
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\
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/* We either errored above or got paused; get out */ \
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if (HTTP_PARSER_ERRNO(parser) != HPE_OK) { \
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return (ER); \
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} \
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} \
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} while (0)
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/* Run the notify callback FOR and consume the current byte */
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#define CALLBACK_NOTIFY(FOR) CALLBACK_NOTIFY_(FOR, p - data + 1)
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/* Run the notify callback FOR and don't consume the current byte */
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#define CALLBACK_NOTIFY_NOADVANCE(FOR) CALLBACK_NOTIFY_(FOR, p - data)
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/* Run data callback FOR with LEN bytes, returning ER if it fails */
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#define CALLBACK_DATA_(FOR, LEN, ER) \
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do { \
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assert(HTTP_PARSER_ERRNO(parser) == HPE_OK); \
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\
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if (FOR##_mark) { \
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if (settings->on_##FOR) { \
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if (0 != settings->on_##FOR(parser, FOR##_mark, (LEN))) { \
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SET_ERRNO(HPE_CB_##FOR); \
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} \
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\
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/* We either errored above or got paused; get out */ \
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if (HTTP_PARSER_ERRNO(parser) != HPE_OK) { \
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return (ER); \
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} \
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} \
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FOR##_mark = NULL; \
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} \
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} while (0)
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/* Run the data callback FOR and consume the current byte */
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#define CALLBACK_DATA(FOR) \
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CALLBACK_DATA_(FOR, p - FOR##_mark, p - data + 1)
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/* Run the data callback FOR and don't consume the current byte */
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#define CALLBACK_DATA_NOADVANCE(FOR) \
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CALLBACK_DATA_(FOR, p - FOR##_mark, p - data)
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/* Set the mark FOR; non-destructive if mark is already set */
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#define MARK(FOR) \
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do { \
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if (!FOR##_mark) { \
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FOR##_mark = p; \
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} \
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} while (0)
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#define PROXY_CONNECTION "proxy-connection"
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#define CONNECTION "connection"
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#define CONTENT_LENGTH "content-length"
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#define TRANSFER_ENCODING "transfer-encoding"
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#define UPGRADE "upgrade"
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#define CHUNKED "chunked"
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#define KEEP_ALIVE "keep-alive"
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#define CLOSE "close"
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static const char *method_strings[] =
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{
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#define XX(num, name, string) #string,
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HTTP_METHOD_MAP(XX)
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#undef XX
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};
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/* Tokens as defined by rfc 2616. Also lowercases them.
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* token = 1*<any CHAR except CTLs or separators>
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* separators = "(" | ")" | "<" | ">" | "@"
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* | "," | ";" | ":" | "\" | <">
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* | "/" | "[" | "]" | "?" | "="
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* | "{" | "}" | SP | HT
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*/
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static const char tokens[256] = {
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/* 0 nul 1 soh 2 stx 3 etx 4 eot 5 enq 6 ack 7 bel */
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0, 0, 0, 0, 0, 0, 0, 0,
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/* 8 bs 9 ht 10 nl 11 vt 12 np 13 cr 14 so 15 si */
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0, 0, 0, 0, 0, 0, 0, 0,
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/* 16 dle 17 dc1 18 dc2 19 dc3 20 dc4 21 nak 22 syn 23 etb */
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0, 0, 0, 0, 0, 0, 0, 0,
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/* 24 can 25 em 26 sub 27 esc 28 fs 29 gs 30 rs 31 us */
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0, 0, 0, 0, 0, 0, 0, 0,
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/* 32 sp 33 ! 34 " 35 # 36 $ 37 % 38 & 39 ' */
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0, '!', 0, '#', '$', '%', '&', '\'',
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/* 40 ( 41 ) 42 * 43 + 44 , 45 - 46 . 47 / */
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0, 0, '*', '+', 0, '-', '.', 0,
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/* 48 0 49 1 50 2 51 3 52 4 53 5 54 6 55 7 */
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'0', '1', '2', '3', '4', '5', '6', '7',
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/* 56 8 57 9 58 : 59 ; 60 < 61 = 62 > 63 ? */
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'8', '9', 0, 0, 0, 0, 0, 0,
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/* 64 @ 65 A 66 B 67 C 68 D 69 E 70 F 71 G */
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0, 'a', 'b', 'c', 'd', 'e', 'f', 'g',
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/* 72 H 73 I 74 J 75 K 76 L 77 M 78 N 79 O */
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'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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/* 80 P 81 Q 82 R 83 S 84 T 85 U 86 V 87 W */
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
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/* 88 X 89 Y 90 Z 91 [ 92 \ 93 ] 94 ^ 95 _ */
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'x', 'y', 'z', 0, 0, 0, '^', '_',
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/* 96 ` 97 a 98 b 99 c 100 d 101 e 102 f 103 g */
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'`', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
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/* 104 h 105 i 106 j 107 k 108 l 109 m 110 n 111 o */
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'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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/* 112 p 113 q 114 r 115 s 116 t 117 u 118 v 119 w */
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
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/* 120 x 121 y 122 z 123 { 124 | 125 } 126 ~ 127 del */
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'x', 'y', 'z', 0, '|', 0, '~', 0 };
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static const int8_t unhex[256] =
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{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
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,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
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,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
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, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1
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,-1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1
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,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
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,-1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1
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,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
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};
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#if HTTP_PARSER_STRICT
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# define T 0
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#else
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# define T 1
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#endif
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static const uint8_t normal_url_char[256] = {
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/* 0 nul 1 soh 2 stx 3 etx 4 eot 5 enq 6 ack 7 bel */
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0, 0, 0, 0, 0, 0, 0, 0,
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/* 8 bs 9 ht 10 nl 11 vt 12 np 13 cr 14 so 15 si */
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0, T, 0, 0, T, 0, 0, 0,
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/* 16 dle 17 dc1 18 dc2 19 dc3 20 dc4 21 nak 22 syn 23 etb */
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0, 0, 0, 0, 0, 0, 0, 0,
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/* 24 can 25 em 26 sub 27 esc 28 fs 29 gs 30 rs 31 us */
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0, 0, 0, 0, 0, 0, 0, 0,
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/* 32 sp 33 ! 34 " 35 # 36 $ 37 % 38 & 39 ' */
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0, 1, 1, 0, 1, 1, 1, 1,
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/* 40 ( 41 ) 42 * 43 + 44 , 45 - 46 . 47 / */
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1, 1, 1, 1, 1, 1, 1, 1,
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/* 48 0 49 1 50 2 51 3 52 4 53 5 54 6 55 7 */
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1, 1, 1, 1, 1, 1, 1, 1,
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/* 56 8 57 9 58 : 59 ; 60 < 61 = 62 > 63 ? */
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1, 1, 1, 1, 1, 1, 1, 0,
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/* 64 @ 65 A 66 B 67 C 68 D 69 E 70 F 71 G */
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1, 1, 1, 1, 1, 1, 1, 1,
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/* 72 H 73 I 74 J 75 K 76 L 77 M 78 N 79 O */
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1, 1, 1, 1, 1, 1, 1, 1,
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/* 80 P 81 Q 82 R 83 S 84 T 85 U 86 V 87 W */
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1, 1, 1, 1, 1, 1, 1, 1,
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|
/* 88 X 89 Y 90 Z 91 [ 92 \ 93 ] 94 ^ 95 _ */
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1, 1, 1, 1, 1, 1, 1, 1,
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|
/* 96 ` 97 a 98 b 99 c 100 d 101 e 102 f 103 g */
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1, 1, 1, 1, 1, 1, 1, 1,
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/* 104 h 105 i 106 j 107 k 108 l 109 m 110 n 111 o */
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1, 1, 1, 1, 1, 1, 1, 1,
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|
/* 112 p 113 q 114 r 115 s 116 t 117 u 118 v 119 w */
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1, 1, 1, 1, 1, 1, 1, 1,
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/* 120 x 121 y 122 z 123 { 124 | 125 } 126 ~ 127 del */
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1, 1, 1, 1, 1, 1, 1, 0, };
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#undef T
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enum state
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{ s_dead = 1 /* important that this is > 0 */
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|
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, s_start_req_or_res
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, s_res_or_resp_H
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, s_start_res
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, s_res_H
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, s_res_HT
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, s_res_HTT
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, s_res_HTTP
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, s_res_first_http_major
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, s_res_http_major
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, s_res_first_http_minor
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, s_res_http_minor
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|
, s_res_first_status_code
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, s_res_status_code
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, s_res_status
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, s_res_line_almost_done
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|
, s_start_req
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|
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|
, s_req_method
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, s_req_spaces_before_url
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|
, s_req_schema
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, s_req_schema_slash
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|
, s_req_schema_slash_slash
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|
, s_req_host_start
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, s_req_host_v6_start
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, s_req_host_v6
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, s_req_host_v6_end
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|
, s_req_host
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|
, s_req_port_start
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|
, s_req_port
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|
, s_req_path
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|
, s_req_query_string_start
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|
, s_req_query_string
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|
, s_req_fragment_start
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|
, s_req_fragment
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|
, s_req_http_start
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|
, s_req_http_H
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|
, s_req_http_HT
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|
, s_req_http_HTT
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|
, s_req_http_HTTP
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|
, s_req_first_http_major
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|
, s_req_http_major
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|
, s_req_first_http_minor
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|
, s_req_http_minor
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|
, s_req_line_almost_done
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|
|
|
, s_header_field_start
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|
, s_header_field
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|
, s_header_value_start
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|
, s_header_value
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|
, s_header_value_lws
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|
|
|
, s_header_almost_done
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|
|
|
, s_chunk_size_start
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|
, s_chunk_size
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|
, s_chunk_parameters
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|
, s_chunk_size_almost_done
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|
|
, s_headers_almost_done
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|
, s_headers_done
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|
|
|
/* Important: 's_headers_done' must be the last 'header' state. All
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|
* states beyond this must be 'body' states. It is used for overflow
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* checking. See the PARSING_HEADER() macro.
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*/
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|
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, s_chunk_data
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|
, s_chunk_data_almost_done
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|
, s_chunk_data_done
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|
|
|
, s_body_identity
|
|
, s_body_identity_eof
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|
|
|
, s_message_done
|
|
};
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|
|
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|
#define PARSING_HEADER(state) (state <= s_headers_done)
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|
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enum header_states
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{ h_general = 0
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, h_C
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|
, h_CO
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|
, h_CON
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|
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|
, h_matching_connection
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|
, h_matching_proxy_connection
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|
, h_matching_content_length
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|
, h_matching_transfer_encoding
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|
, h_matching_upgrade
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|
|
|
, h_connection
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|
, h_content_length
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|
, h_transfer_encoding
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|
, h_upgrade
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|
|
|
, h_matching_transfer_encoding_chunked
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|
, h_matching_connection_keep_alive
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, h_matching_connection_close
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|
|
|
, h_transfer_encoding_chunked
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, h_connection_keep_alive
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, h_connection_close
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};
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|
|
|
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/* Macros for character classes; depends on strict-mode */
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#define CR '\r'
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#define LF '\n'
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#define LOWER(c) (unsigned char)(c | 0x20)
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#define IS_ALPHA(c) (LOWER(c) >= 'a' && LOWER(c) <= 'z')
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#define IS_NUM(c) ((c) >= '0' && (c) <= '9')
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#define IS_ALPHANUM(c) (IS_ALPHA(c) || IS_NUM(c))
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#define IS_HEX(c) (IS_NUM(c) || (LOWER(c) >= 'a' && LOWER(c) <= 'f'))
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|
|
#if HTTP_PARSER_STRICT
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#define TOKEN(c) (tokens[(unsigned char)c])
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#define IS_URL_CHAR(c) (normal_url_char[(unsigned char) (c)])
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#define IS_HOST_CHAR(c) (IS_ALPHANUM(c) || (c) == '.' || (c) == '-')
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|
#else
|
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#define TOKEN(c) ((c == ' ') ? ' ' : tokens[(unsigned char)c])
|
|
#define IS_URL_CHAR(c) \
|
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(normal_url_char[(unsigned char) (c)] || ((c) & 0x80))
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#define IS_HOST_CHAR(c) \
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(IS_ALPHANUM(c) || (c) == '.' || (c) == '-' || (c) == '_')
|
|
#endif
|
|
|
|
|
|
#define start_state (parser->type == HTTP_REQUEST ? s_start_req : s_start_res)
|
|
|
|
|
|
#if HTTP_PARSER_STRICT
|
|
# define STRICT_CHECK(cond) \
|
|
do { \
|
|
if (cond) { \
|
|
SET_ERRNO(HPE_STRICT); \
|
|
goto error; \
|
|
} \
|
|
} while (0)
|
|
# define NEW_MESSAGE() (http_should_keep_alive(parser) ? start_state : s_dead)
|
|
#else
|
|
# define STRICT_CHECK(cond)
|
|
# define NEW_MESSAGE() start_state
|
|
#endif
|
|
|
|
|
|
/* Map errno values to strings for human-readable output */
|
|
#define HTTP_STRERROR_GEN(n, s) { "HPE_" #n, s },
|
|
static struct {
|
|
const char *name;
|
|
const char *description;
|
|
} http_strerror_tab[] = {
|
|
HTTP_ERRNO_MAP(HTTP_STRERROR_GEN)
|
|
};
|
|
#undef HTTP_STRERROR_GEN
|
|
|
|
int http_message_needs_eof(http_parser *parser);
|
|
|
|
/* 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.
|
|
*/
|
|
static enum state
|
|
parse_url_char(enum state s, const char ch)
|
|
{
|
|
if (ch == ' ' || ch == '\r' || ch == '\n') {
|
|
return s_dead;
|
|
}
|
|
|
|
#if HTTP_PARSER_STRICT
|
|
if (ch == '\t' || ch == '\f') {
|
|
return s_dead;
|
|
}
|
|
#endif
|
|
|
|
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 (IS_ALPHA(ch)) {
|
|
return s_req_schema;
|
|
}
|
|
|
|
break;
|
|
|
|
case s_req_schema:
|
|
if (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_host_start;
|
|
}
|
|
|
|
break;
|
|
|
|
case s_req_host_start:
|
|
if (ch == '[') {
|
|
return s_req_host_v6_start;
|
|
}
|
|
|
|
if (IS_HOST_CHAR(ch)) {
|
|
return s_req_host;
|
|
}
|
|
|
|
break;
|
|
|
|
case s_req_host:
|
|
if (IS_HOST_CHAR(ch)) {
|
|
return s_req_host;
|
|
}
|
|
|
|
/* FALLTHROUGH */
|
|
case s_req_host_v6_end:
|
|
switch (ch) {
|
|
case ':':
|
|
return s_req_port_start;
|
|
|
|
case '/':
|
|
return s_req_path;
|
|
|
|
case '?':
|
|
return s_req_query_string_start;
|
|
}
|
|
|
|
break;
|
|
|
|
case s_req_host_v6:
|
|
if (ch == ']') {
|
|
return s_req_host_v6_end;
|
|
}
|
|
|
|
/* FALLTHROUGH */
|
|
case s_req_host_v6_start:
|
|
if (IS_HEX(ch) || ch == ':') {
|
|
return s_req_host_v6;
|
|
}
|
|
break;
|
|
|
|
case s_req_port:
|
|
switch (ch) {
|
|
case '/':
|
|
return s_req_path;
|
|
|
|
case '?':
|
|
return s_req_query_string_start;
|
|
}
|
|
|
|
/* FALLTHROUGH */
|
|
case s_req_port_start:
|
|
if (IS_NUM(ch)) {
|
|
return s_req_port;
|
|
}
|
|
|
|
break;
|
|
|
|
case s_req_path:
|
|
if (IS_URL_CHAR(ch)) {
|
|
return s;
|
|
}
|
|
|
|
switch (ch) {
|
|
case '?':
|
|
return s_req_query_string_start;
|
|
|
|
case '#':
|
|
return s_req_fragment_start;
|
|
}
|
|
|
|
break;
|
|
|
|
case s_req_query_string_start:
|
|
case s_req_query_string:
|
|
if (IS_URL_CHAR(ch)) {
|
|
return s_req_query_string;
|
|
}
|
|
|
|
switch (ch) {
|
|
case '?':
|
|
/* allow extra '?' in query string */
|
|
return s_req_query_string;
|
|
|
|
case '#':
|
|
return s_req_fragment_start;
|
|
}
|
|
|
|
break;
|
|
|
|
case s_req_fragment_start:
|
|
if (IS_URL_CHAR(ch)) {
|
|
return s_req_fragment;
|
|
}
|
|
|
|
switch (ch) {
|
|
case '?':
|
|
return s_req_fragment;
|
|
|
|
case '#':
|
|
return s;
|
|
}
|
|
|
|
break;
|
|
|
|
case s_req_fragment:
|
|
if (IS_URL_CHAR(ch)) {
|
|
return s;
|
|
}
|
|
|
|
switch (ch) {
|
|
case '?':
|
|
case '#':
|
|
return s;
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* We should never fall out of the switch above unless there's an error */
|
|
return s_dead;
|
|
}
|
|
|
|
size_t http_parser_execute (http_parser *parser,
|
|
const http_parser_settings *settings,
|
|
const char *data,
|
|
size_t len)
|
|
{
|
|
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 *body_mark = 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 (parser->state) {
|
|
case s_body_identity_eof:
|
|
/* Use of CALLBACK_NOTIFY() here would erroneously return 1 byte read if
|
|
* we got paused.
|
|
*/
|
|
CALLBACK_NOTIFY_NOADVANCE(message_complete);
|
|
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 (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_host_start:
|
|
case s_req_host_v6_start:
|
|
case s_req_host_v6:
|
|
case s_req_host_v6_end:
|
|
case s_req_host:
|
|
case s_req_port_start:
|
|
case s_req_port:
|
|
case s_req_query_string_start:
|
|
case s_req_query_string:
|
|
case s_req_fragment_start:
|
|
case s_req_fragment:
|
|
url_mark = data;
|
|
break;
|
|
}
|
|
|
|
for (p=data; p != data + len; p++) {
|
|
ch = *p;
|
|
|
|
if (PARSING_HEADER(parser->state)) {
|
|
++parser->nread;
|
|
/* Buffer overflow attack */
|
|
if (parser->nread > HTTP_MAX_HEADER_SIZE) {
|
|
SET_ERRNO(HPE_HEADER_OVERFLOW);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
reexecute_byte:
|
|
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 (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 = 0;
|
|
parser->content_length = ULLONG_MAX;
|
|
|
|
if (ch == 'H') {
|
|
parser->state = s_res_or_resp_H;
|
|
|
|
CALLBACK_NOTIFY(message_begin);
|
|
} else {
|
|
parser->type = HTTP_REQUEST;
|
|
parser->state = s_start_req;
|
|
goto reexecute_byte;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case s_res_or_resp_H:
|
|
if (ch == 'T') {
|
|
parser->type = HTTP_RESPONSE;
|
|
parser->state = s_res_HT;
|
|
} else {
|
|
if (ch != 'E') {
|
|
SET_ERRNO(HPE_INVALID_CONSTANT);
|
|
goto error;
|
|
}
|
|
|
|
parser->type = HTTP_REQUEST;
|
|
parser->method = HTTP_HEAD;
|
|
parser->index = 2;
|
|
parser->state = s_req_method;
|
|
}
|
|
break;
|
|
|
|
case s_start_res:
|
|
{
|
|
parser->flags = 0;
|
|
parser->content_length = ULLONG_MAX;
|
|
|
|
switch (ch) {
|
|
case 'H':
|
|
parser->state = s_res_H;
|
|
break;
|
|
|
|
case CR:
|
|
case LF:
|
|
break;
|
|
|
|
default:
|
|
SET_ERRNO(HPE_INVALID_CONSTANT);
|
|
goto error;
|
|
}
|
|
|
|
CALLBACK_NOTIFY(message_begin);
|
|
break;
|
|
}
|
|
|
|
case s_res_H:
|
|
STRICT_CHECK(ch != 'T');
|
|
parser->state = s_res_HT;
|
|
break;
|
|
|
|
case s_res_HT:
|
|
STRICT_CHECK(ch != 'T');
|
|
parser->state = s_res_HTT;
|
|
break;
|
|
|
|
case s_res_HTT:
|
|
STRICT_CHECK(ch != 'P');
|
|
parser->state = s_res_HTTP;
|
|
break;
|
|
|
|
case s_res_HTTP:
|
|
STRICT_CHECK(ch != '/');
|
|
parser->state = s_res_first_http_major;
|
|
break;
|
|
|
|
case s_res_first_http_major:
|
|
if (ch < '0' || ch > '9') {
|
|
SET_ERRNO(HPE_INVALID_VERSION);
|
|
goto error;
|
|
}
|
|
|
|
parser->http_major = ch - '0';
|
|
parser->state = s_res_http_major;
|
|
break;
|
|
|
|
/* major HTTP version or dot */
|
|
case s_res_http_major:
|
|
{
|
|
if (ch == '.') {
|
|
parser->state = s_res_first_http_minor;
|
|
break;
|
|
}
|
|
|
|
if (!IS_NUM(ch)) {
|
|
SET_ERRNO(HPE_INVALID_VERSION);
|
|
goto error;
|
|
}
|
|
|
|
parser->http_major *= 10;
|
|
parser->http_major += ch - '0';
|
|
|
|
if (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 (!IS_NUM(ch)) {
|
|
SET_ERRNO(HPE_INVALID_VERSION);
|
|
goto error;
|
|
}
|
|
|
|
parser->http_minor = ch - '0';
|
|
parser->state = s_res_http_minor;
|
|
break;
|
|
|
|
/* minor HTTP version or end of request line */
|
|
case s_res_http_minor:
|
|
{
|
|
if (ch == ' ') {
|
|
parser->state = s_res_first_status_code;
|
|
break;
|
|
}
|
|
|
|
if (!IS_NUM(ch)) {
|
|
SET_ERRNO(HPE_INVALID_VERSION);
|
|
goto error;
|
|
}
|
|
|
|
parser->http_minor *= 10;
|
|
parser->http_minor += ch - '0';
|
|
|
|
if (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';
|
|
parser->state = s_res_status_code;
|
|
break;
|
|
}
|
|
|
|
case s_res_status_code:
|
|
{
|
|
if (!IS_NUM(ch)) {
|
|
switch (ch) {
|
|
case ' ':
|
|
parser->state = s_res_status;
|
|
break;
|
|
case CR:
|
|
parser->state = s_res_line_almost_done;
|
|
break;
|
|
case LF:
|
|
parser->state = s_header_field_start;
|
|
break;
|
|
default:
|
|
SET_ERRNO(HPE_INVALID_STATUS);
|
|
goto error;
|
|
}
|
|
break;
|
|
}
|
|
|
|
parser->status_code *= 10;
|
|
parser->status_code += ch - '0';
|
|
|
|
if (parser->status_code > 999) {
|
|
SET_ERRNO(HPE_INVALID_STATUS);
|
|
goto error;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case s_res_status:
|
|
/* the human readable status. e.g. "NOT FOUND"
|
|
* we are not humans so just ignore this */
|
|
if (ch == CR) {
|
|
parser->state = s_res_line_almost_done;
|
|
break;
|
|
}
|
|
|
|
if (ch == LF) {
|
|
parser->state = s_header_field_start;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case s_res_line_almost_done:
|
|
STRICT_CHECK(ch != LF);
|
|
parser->state = s_header_field_start;
|
|
break;
|
|
|
|
case s_start_req:
|
|
{
|
|
if (ch == CR || ch == LF)
|
|
break;
|
|
parser->flags = 0;
|
|
parser->content_length = ULLONG_MAX;
|
|
|
|
if (!IS_ALPHA(ch)) {
|
|
SET_ERRNO(HPE_INVALID_METHOD);
|
|
goto error;
|
|
}
|
|
|
|
parser->method = (enum http_method) 0;
|
|
parser->index = 1;
|
|
switch (ch) {
|
|
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; break;
|
|
case 'M': parser->method = HTTP_MKCOL; /* or MOVE, MKACTIVITY, MERGE, M-SEARCH */ 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; 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 */ break;
|
|
default:
|
|
SET_ERRNO(HPE_INVALID_METHOD);
|
|
goto error;
|
|
}
|
|
parser->state = s_req_method;
|
|
|
|
CALLBACK_NOTIFY(message_begin);
|
|
|
|
break;
|
|
}
|
|
|
|
case s_req_method:
|
|
{
|
|
const char *matcher;
|
|
if (ch == '\0') {
|
|
SET_ERRNO(HPE_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 (parser->method == HTTP_CONNECT) {
|
|
if (parser->index == 1 && ch == 'H') {
|
|
parser->method = HTTP_CHECKOUT;
|
|
} else if (parser->index == 2 && ch == 'P') {
|
|
parser->method = HTTP_COPY;
|
|
} else {
|
|
goto error;
|
|
}
|
|
} else if (parser->method == HTTP_MKCOL) {
|
|
if (parser->index == 1 && ch == 'O') {
|
|
parser->method = HTTP_MOVE;
|
|
} else if (parser->index == 1 && ch == 'E') {
|
|
parser->method = HTTP_MERGE;
|
|
} else if (parser->index == 1 && ch == '-') {
|
|
parser->method = HTTP_MSEARCH;
|
|
} else if (parser->index == 2 && ch == 'A') {
|
|
parser->method = HTTP_MKACTIVITY;
|
|
} else {
|
|
goto error;
|
|
}
|
|
} else if (parser->method == HTTP_SUBSCRIBE) {
|
|
if (parser->index == 1 && ch == 'E') {
|
|
parser->method = HTTP_SEARCH;
|
|
} else {
|
|
goto error;
|
|
}
|
|
} else if (parser->index == 1 && parser->method == HTTP_POST) {
|
|
if (ch == 'R') {
|
|
parser->method = HTTP_PROPFIND; /* or HTTP_PROPPATCH */
|
|
} else if (ch == 'U') {
|
|
parser->method = HTTP_PUT; /* or HTTP_PURGE */
|
|
} else if (ch == 'A') {
|
|
parser->method = HTTP_PATCH;
|
|
} else {
|
|
goto error;
|
|
}
|
|
} else if (parser->index == 2) {
|
|
if (parser->method == HTTP_PUT) {
|
|
if (ch == 'R') parser->method = HTTP_PURGE;
|
|
} else if (parser->method == HTTP_UNLOCK) {
|
|
if (ch == 'S') parser->method = HTTP_UNSUBSCRIBE;
|
|
}
|
|
} else if (parser->index == 4 && parser->method == HTTP_PROPFIND && ch == 'P') {
|
|
parser->method = HTTP_PROPPATCH;
|
|
} 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) {
|
|
parser->state = s_req_host_start;
|
|
}
|
|
|
|
parser->state = parse_url_char((enum state)parser->state, ch);
|
|
if (parser->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_host_start:
|
|
case s_req_host_v6_start:
|
|
case s_req_host_v6:
|
|
case s_req_port_start:
|
|
{
|
|
switch (ch) {
|
|
/* No whitespace allowed here */
|
|
case ' ':
|
|
case CR:
|
|
case LF:
|
|
SET_ERRNO(HPE_INVALID_URL);
|
|
goto error;
|
|
default:
|
|
parser->state = parse_url_char((enum state)parser->state, ch);
|
|
if (parser->state == s_dead) {
|
|
SET_ERRNO(HPE_INVALID_URL);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case s_req_host:
|
|
case s_req_host_v6_end:
|
|
case s_req_port:
|
|
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 ' ':
|
|
parser->state = s_req_http_start;
|
|
CALLBACK_DATA(url);
|
|
break;
|
|
case CR:
|
|
case LF:
|
|
parser->http_major = 0;
|
|
parser->http_minor = 9;
|
|
parser->state = (ch == CR) ?
|
|
s_req_line_almost_done :
|
|
s_header_field_start;
|
|
CALLBACK_DATA(url);
|
|
break;
|
|
default:
|
|
parser->state = parse_url_char((enum state)parser->state, ch);
|
|
if (parser->state == s_dead) {
|
|
SET_ERRNO(HPE_INVALID_URL);
|
|
goto error;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case s_req_http_start:
|
|
switch (ch) {
|
|
case 'H':
|
|
parser->state = s_req_http_H;
|
|
break;
|
|
case ' ':
|
|
break;
|
|
default:
|
|
SET_ERRNO(HPE_INVALID_CONSTANT);
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
case s_req_http_H:
|
|
STRICT_CHECK(ch != 'T');
|
|
parser->state = s_req_http_HT;
|
|
break;
|
|
|
|
case s_req_http_HT:
|
|
STRICT_CHECK(ch != 'T');
|
|
parser->state = s_req_http_HTT;
|
|
break;
|
|
|
|
case s_req_http_HTT:
|
|
STRICT_CHECK(ch != 'P');
|
|
parser->state = s_req_http_HTTP;
|
|
break;
|
|
|
|
case s_req_http_HTTP:
|
|
STRICT_CHECK(ch != '/');
|
|
parser->state = s_req_first_http_major;
|
|
break;
|
|
|
|
/* first digit of major HTTP version */
|
|
case s_req_first_http_major:
|
|
if (ch < '1' || ch > '9') {
|
|
SET_ERRNO(HPE_INVALID_VERSION);
|
|
goto error;
|
|
}
|
|
|
|
parser->http_major = ch - '0';
|
|
parser->state = s_req_http_major;
|
|
break;
|
|
|
|
/* major HTTP version or dot */
|
|
case s_req_http_major:
|
|
{
|
|
if (ch == '.') {
|
|
parser->state = s_req_first_http_minor;
|
|
break;
|
|
}
|
|
|
|
if (!IS_NUM(ch)) {
|
|
SET_ERRNO(HPE_INVALID_VERSION);
|
|
goto error;
|
|
}
|
|
|
|
parser->http_major *= 10;
|
|
parser->http_major += ch - '0';
|
|
|
|
if (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 (!IS_NUM(ch)) {
|
|
SET_ERRNO(HPE_INVALID_VERSION);
|
|
goto error;
|
|
}
|
|
|
|
parser->http_minor = ch - '0';
|
|
parser->state = s_req_http_minor;
|
|
break;
|
|
|
|
/* minor HTTP version or end of request line */
|
|
case s_req_http_minor:
|
|
{
|
|
if (ch == CR) {
|
|
parser->state = s_req_line_almost_done;
|
|
break;
|
|
}
|
|
|
|
if (ch == LF) {
|
|
parser->state = s_header_field_start;
|
|
break;
|
|
}
|
|
|
|
/* XXX allow spaces after digit? */
|
|
|
|
if (!IS_NUM(ch)) {
|
|
SET_ERRNO(HPE_INVALID_VERSION);
|
|
goto error;
|
|
}
|
|
|
|
parser->http_minor *= 10;
|
|
parser->http_minor += ch - '0';
|
|
|
|
if (parser->http_minor > 999) {
|
|
SET_ERRNO(HPE_INVALID_VERSION);
|
|
goto error;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* end of request line */
|
|
case s_req_line_almost_done:
|
|
{
|
|
if (ch != LF) {
|
|
SET_ERRNO(HPE_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;
|
|
goto reexecute_byte;
|
|
}
|
|
|
|
c = TOKEN(ch);
|
|
|
|
if (!c) {
|
|
SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
|
|
goto error;
|
|
}
|
|
|
|
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:
|
|
{
|
|
c = TOKEN(ch);
|
|
|
|
if (c) {
|
|
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++;
|
|
if (parser->index > sizeof(CONNECTION)-1
|
|
|| 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++;
|
|
if (parser->index > sizeof(PROXY_CONNECTION)-1
|
|
|| 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++;
|
|
if (parser->index > sizeof(CONTENT_LENGTH)-1
|
|
|| 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++;
|
|
if (parser->index > sizeof(TRANSFER_ENCODING)-1
|
|
|| 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++;
|
|
if (parser->index > sizeof(UPGRADE)-1
|
|
|| 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(0 && "Unknown header_state");
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (ch == ':') {
|
|
parser->state = s_header_value_start;
|
|
CALLBACK_DATA(header_field);
|
|
break;
|
|
}
|
|
|
|
if (ch == CR) {
|
|
parser->state = s_header_almost_done;
|
|
CALLBACK_DATA(header_field);
|
|
break;
|
|
}
|
|
|
|
if (ch == LF) {
|
|
parser->state = s_header_field_start;
|
|
CALLBACK_DATA(header_field);
|
|
break;
|
|
}
|
|
|
|
SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
|
|
goto error;
|
|
}
|
|
|
|
case s_header_value_start:
|
|
{
|
|
if (ch == ' ' || ch == '\t') break;
|
|
|
|
MARK(header_value);
|
|
|
|
parser->state = s_header_value;
|
|
parser->index = 0;
|
|
|
|
if (ch == CR) {
|
|
parser->header_state = h_general;
|
|
parser->state = s_header_almost_done;
|
|
CALLBACK_DATA(header_value);
|
|
break;
|
|
}
|
|
|
|
if (ch == LF) {
|
|
parser->state = s_header_field_start;
|
|
CALLBACK_DATA(header_value);
|
|
break;
|
|
}
|
|
|
|
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 (!IS_NUM(ch)) {
|
|
SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
|
|
goto error;
|
|
}
|
|
|
|
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 {
|
|
parser->header_state = h_general;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
parser->header_state = h_general;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case s_header_value:
|
|
{
|
|
|
|
if (ch == CR) {
|
|
parser->state = s_header_almost_done;
|
|
CALLBACK_DATA(header_value);
|
|
break;
|
|
}
|
|
|
|
if (ch == LF) {
|
|
parser->state = s_header_almost_done;
|
|
CALLBACK_DATA_NOADVANCE(header_value);
|
|
goto reexecute_byte;
|
|
}
|
|
|
|
c = LOWER(ch);
|
|
|
|
switch (parser->header_state) {
|
|
case h_general:
|
|
break;
|
|
|
|
case h_connection:
|
|
case h_transfer_encoding:
|
|
assert(0 && "Shouldn't get here.");
|
|
break;
|
|
|
|
case h_content_length:
|
|
{
|
|
uint64_t t;
|
|
|
|
if (ch == ' ') break;
|
|
|
|
if (!IS_NUM(ch)) {
|
|
SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
|
|
goto error;
|
|
}
|
|
|
|
t = parser->content_length;
|
|
t *= 10;
|
|
t += ch - '0';
|
|
|
|
/* Overflow? */
|
|
if (t < parser->content_length || t == ULLONG_MAX) {
|
|
SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
|
|
goto error;
|
|
}
|
|
|
|
parser->content_length = t;
|
|
break;
|
|
}
|
|
|
|
/* Transfer-Encoding: chunked */
|
|
case h_matching_transfer_encoding_chunked:
|
|
parser->index++;
|
|
if (parser->index > sizeof(CHUNKED)-1
|
|
|| c != CHUNKED[parser->index]) {
|
|
parser->header_state = h_general;
|
|
} else if (parser->index == sizeof(CHUNKED)-2) {
|
|
parser->header_state = h_transfer_encoding_chunked;
|
|
}
|
|
break;
|
|
|
|
/* looking for 'Connection: keep-alive' */
|
|
case h_matching_connection_keep_alive:
|
|
parser->index++;
|
|
if (parser->index > sizeof(KEEP_ALIVE)-1
|
|
|| c != KEEP_ALIVE[parser->index]) {
|
|
parser->header_state = h_general;
|
|
} else if (parser->index == sizeof(KEEP_ALIVE)-2) {
|
|
parser->header_state = h_connection_keep_alive;
|
|
}
|
|
break;
|
|
|
|
/* looking for 'Connection: close' */
|
|
case h_matching_connection_close:
|
|
parser->index++;
|
|
if (parser->index > sizeof(CLOSE)-1 || c != CLOSE[parser->index]) {
|
|
parser->header_state = h_general;
|
|
} else if (parser->index == sizeof(CLOSE)-2) {
|
|
parser->header_state = h_connection_close;
|
|
}
|
|
break;
|
|
|
|
case h_transfer_encoding_chunked:
|
|
case h_connection_keep_alive:
|
|
case h_connection_close:
|
|
if (ch != ' ') parser->header_state = h_general;
|
|
break;
|
|
|
|
default:
|
|
parser->state = s_header_value;
|
|
parser->header_state = h_general;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case s_header_almost_done:
|
|
{
|
|
STRICT_CHECK(ch != LF);
|
|
|
|
parser->state = s_header_value_lws;
|
|
|
|
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;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case s_header_value_lws:
|
|
{
|
|
if (ch == ' ' || ch == '\t')
|
|
parser->state = s_header_value_start;
|
|
else
|
|
{
|
|
parser->state = s_header_field_start;
|
|
goto reexecute_byte;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case s_headers_almost_done:
|
|
{
|
|
STRICT_CHECK(ch != LF);
|
|
|
|
if (parser->flags & F_TRAILING) {
|
|
/* End of a chunked request */
|
|
parser->state = NEW_MESSAGE();
|
|
CALLBACK_NOTIFY(message_complete);
|
|
break;
|
|
}
|
|
|
|
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 == 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 recieving 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 1:
|
|
parser->flags |= F_SKIPBODY;
|
|
break;
|
|
|
|
default:
|
|
SET_ERRNO(HPE_CB_headers_complete);
|
|
return p - data; /* Error */
|
|
}
|
|
}
|
|
|
|
if (HTTP_PARSER_ERRNO(parser) != HPE_OK) {
|
|
return p - data;
|
|
}
|
|
|
|
goto reexecute_byte;
|
|
}
|
|
|
|
case s_headers_done:
|
|
{
|
|
STRICT_CHECK(ch != LF);
|
|
|
|
parser->nread = 0;
|
|
|
|
/* Exit, the rest of the connect is in a different protocol. */
|
|
if (parser->upgrade) {
|
|
parser->state = NEW_MESSAGE();
|
|
CALLBACK_NOTIFY(message_complete);
|
|
return (p - data) + 1;
|
|
}
|
|
|
|
if (parser->flags & F_SKIPBODY) {
|
|
parser->state = NEW_MESSAGE();
|
|
CALLBACK_NOTIFY(message_complete);
|
|
} else if (parser->flags & F_CHUNKED) {
|
|
/* chunked encoding - ignore Content-Length header */
|
|
parser->state = s_chunk_size_start;
|
|
} else {
|
|
if (parser->content_length == 0) {
|
|
/* Content-Length header given but zero: Content-Length: 0\r\n */
|
|
parser->state = NEW_MESSAGE();
|
|
CALLBACK_NOTIFY(message_complete);
|
|
} else if (parser->content_length != ULLONG_MAX) {
|
|
/* Content-Length header given and non-zero */
|
|
parser->state = s_body_identity;
|
|
} else {
|
|
if (parser->type == HTTP_REQUEST ||
|
|
!http_message_needs_eof(parser)) {
|
|
/* Assume content-length 0 - read the next */
|
|
parser->state = NEW_MESSAGE();
|
|
CALLBACK_NOTIFY(message_complete);
|
|
} else {
|
|
/* Read body until EOF */
|
|
parser->state = s_body_identity_eof;
|
|
}
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case s_body_identity:
|
|
{
|
|
uint64_t to_read = MIN(parser->content_length,
|
|
(uint64_t) ((data + len) - p));
|
|
|
|
assert(parser->content_length != 0
|
|
&& parser->content_length != 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.
|
|
*/
|
|
MARK(body);
|
|
parser->content_length -= to_read;
|
|
p += to_read - 1;
|
|
|
|
if (parser->content_length == 0) {
|
|
parser->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.
|
|
*/
|
|
CALLBACK_DATA_(body, p - body_mark + 1, p - data);
|
|
goto reexecute_byte;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* read until EOF */
|
|
case s_body_identity_eof:
|
|
MARK(body);
|
|
p = data + len - 1;
|
|
|
|
break;
|
|
|
|
case s_message_done:
|
|
parser->state = NEW_MESSAGE();
|
|
CALLBACK_NOTIFY(message_complete);
|
|
break;
|
|
|
|
case s_chunk_size_start:
|
|
{
|
|
assert(parser->nread == 1);
|
|
assert(parser->flags & F_CHUNKED);
|
|
|
|
unhex_val = unhex[(unsigned char)ch];
|
|
if (unhex_val == -1) {
|
|
SET_ERRNO(HPE_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[(unsigned char)ch];
|
|
|
|
if (unhex_val == -1) {
|
|
if (ch == ';' || ch == ' ') {
|
|
parser->state = s_chunk_parameters;
|
|
break;
|
|
}
|
|
|
|
SET_ERRNO(HPE_INVALID_CHUNK_SIZE);
|
|
goto error;
|
|
}
|
|
|
|
t = parser->content_length;
|
|
t *= 16;
|
|
t += unhex_val;
|
|
|
|
/* Overflow? */
|
|
if (t < parser->content_length || t == ULLONG_MAX) {
|
|
SET_ERRNO(HPE_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);
|
|
STRICT_CHECK(ch != LF);
|
|
|
|
parser->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 = MIN(parser->content_length,
|
|
(uint64_t) ((data + len) - p));
|
|
|
|
assert(parser->flags & F_CHUNKED);
|
|
assert(parser->content_length != 0
|
|
&& 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 == 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);
|
|
STRICT_CHECK(ch != CR);
|
|
parser->state = s_chunk_data_done;
|
|
CALLBACK_DATA(body);
|
|
break;
|
|
|
|
case s_chunk_data_done:
|
|
assert(parser->flags & F_CHUNKED);
|
|
STRICT_CHECK(ch != LF);
|
|
parser->nread = 0;
|
|
parser->state = s_chunk_size_start;
|
|
break;
|
|
|
|
default:
|
|
assert(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(((header_field_mark ? 1 : 0) +
|
|
(header_value_mark ? 1 : 0) +
|
|
(url_mark ? 1 : 0) +
|
|
(body_mark ? 1 : 0)) <= 1);
|
|
|
|
CALLBACK_DATA_NOADVANCE(header_field);
|
|
CALLBACK_DATA_NOADVANCE(header_value);
|
|
CALLBACK_DATA_NOADVANCE(url);
|
|
CALLBACK_DATA_NOADVANCE(body);
|
|
|
|
return len;
|
|
|
|
error:
|
|
if (HTTP_PARSER_ERRNO(parser) == HPE_OK) {
|
|
SET_ERRNO(HPE_UNKNOWN);
|
|
}
|
|
|
|
return (p - data);
|
|
}
|
|
|
|
|
|
/* Does the parser need to see an EOF to find the end of the message? */
|
|
int
|
|
http_message_needs_eof (http_parser *parser)
|
|
{
|
|
if (parser->type == HTTP_REQUEST) {
|
|
return 0;
|
|
}
|
|
|
|
/* See RFC 2616 section 4.4 */
|
|
if (parser->status_code / 100 == 1 || /* 1xx e.g. Continue */
|
|
parser->status_code == 204 || /* No Content */
|
|
parser->status_code == 304 || /* 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 (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 method_strings[m];
|
|
}
|
|
|
|
|
|
void
|
|
http_parser_init (http_parser *parser, enum http_parser_type t)
|
|
{
|
|
void *data = parser->data; /* preserve application data */
|
|
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;
|
|
}
|
|
|
|
const char *
|
|
http_errno_name(enum http_errno err) {
|
|
assert(err < (sizeof(http_strerror_tab)/sizeof(http_strerror_tab[0])));
|
|
return http_strerror_tab[err].name;
|
|
}
|
|
|
|
const char *
|
|
http_errno_description(enum http_errno err) {
|
|
assert(err < (sizeof(http_strerror_tab)/sizeof(http_strerror_tab[0])));
|
|
return http_strerror_tab[err].description;
|
|
}
|
|
|
|
int
|
|
http_parser_parse_url(const char *buf, size_t buflen, int is_connect,
|
|
struct http_parser_url *u)
|
|
{
|
|
enum state s;
|
|
const char *p;
|
|
enum http_parser_url_fields uf, old_uf;
|
|
|
|
u->port = u->field_set = 0;
|
|
s = is_connect ? s_req_host_start : s_req_spaces_before_url;
|
|
uf = old_uf = UF_MAX;
|
|
|
|
for (p = buf; p < buf + buflen; p++) {
|
|
s = parse_url_char(s, *p);
|
|
|
|
/* Figure out the next field that we're operating on */
|
|
switch (s) {
|
|
case s_dead:
|
|
return 1;
|
|
|
|
/* Skip delimeters */
|
|
case s_req_schema_slash:
|
|
case s_req_schema_slash_slash:
|
|
case s_req_host_start:
|
|
case s_req_host_v6_start:
|
|
case s_req_host_v6_end:
|
|
case s_req_port_start:
|
|
case s_req_query_string_start:
|
|
case s_req_fragment_start:
|
|
continue;
|
|
|
|
case s_req_schema:
|
|
uf = UF_SCHEMA;
|
|
break;
|
|
|
|
case s_req_host:
|
|
case s_req_host_v6:
|
|
uf = UF_HOST;
|
|
break;
|
|
|
|
case s_req_port:
|
|
uf = UF_PORT;
|
|
break;
|
|
|
|
case s_req_path:
|
|
uf = UF_PATH;
|
|
break;
|
|
|
|
case s_req_query_string:
|
|
uf = UF_QUERY;
|
|
break;
|
|
|
|
case s_req_fragment:
|
|
uf = UF_FRAGMENT;
|
|
break;
|
|
|
|
default:
|
|
assert(!"Unexpected state");
|
|
return 1;
|
|
}
|
|
|
|
/* Nothing's changed; soldier on */
|
|
if (uf == old_uf) {
|
|
u->field_data[uf].len++;
|
|
continue;
|
|
}
|
|
|
|
u->field_data[uf].off = p - buf;
|
|
u->field_data[uf].len = 1;
|
|
|
|
u->field_set |= (1 << uf);
|
|
old_uf = uf;
|
|
}
|
|
|
|
/* CONNECT requests can only contain "hostname:port" */
|
|
if (is_connect && u->field_set != ((1 << UF_HOST)|(1 << UF_PORT))) {
|
|
return 1;
|
|
}
|
|
|
|
/* Make sure we don't end somewhere unexpected */
|
|
switch (s) {
|
|
case s_req_host_v6_start:
|
|
case s_req_host_v6:
|
|
case s_req_host_v6_end:
|
|
case s_req_host:
|
|
case s_req_port_start:
|
|
return 1;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (u->field_set & (1 << UF_PORT)) {
|
|
/* Don't bother with endp; we've already validated the string */
|
|
unsigned long v = strtoul(buf + u->field_data[UF_PORT].off, NULL, 10);
|
|
|
|
/* Ports have a max value of 2^16 */
|
|
if (v > 0xffff) {
|
|
return 1;
|
|
}
|
|
|
|
u->port = (uint16_t) v;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
http_parser_pause(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(0 && "Attempting to pause parser in error state");
|
|
}
|
|
}
|