| /* 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 "http_parser.h" |
| #include <assert.h> |
| #include <stddef.h> |
| #include <ctype.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <limits.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) \ |
| do { \ |
| parser->http_errno = (e); \ |
| } while(0) |
| |
| |
| /* Run the notify callback FOR, returning ER if it fails */ |
| #define CALLBACK_NOTIFY_(FOR, ER) \ |
| do { \ |
| assert(HTTP_PARSER_ERRNO(parser) == HPE_OK); \ |
| \ |
| if (settings->on_##FOR) { \ |
| if (0 != settings->on_##FOR(parser)) { \ |
| SET_ERRNO(HPE_CB_##FOR); \ |
| } \ |
| \ |
| /* We either errored above or got paused; get out */ \ |
| if (HTTP_PARSER_ERRNO(parser) != HPE_OK) { \ |
| return (ER); \ |
| } \ |
| } \ |
| } while (0) |
| |
| /* Run the notify callback FOR and consume the current byte */ |
| #define CALLBACK_NOTIFY(FOR) CALLBACK_NOTIFY_(FOR, p - data + 1) |
| |
| /* Run the notify callback FOR and don't consume the current byte */ |
| #define CALLBACK_NOTIFY_NOADVANCE(FOR) CALLBACK_NOTIFY_(FOR, p - data) |
| |
| /* Run data callback FOR with LEN bytes, returning ER if it fails */ |
| #define CALLBACK_DATA_(FOR, LEN, ER) \ |
| do { \ |
| assert(HTTP_PARSER_ERRNO(parser) == HPE_OK); \ |
| \ |
| if (FOR##_mark) { \ |
| if (settings->on_##FOR) { \ |
| if (0 != settings->on_##FOR(parser, FOR##_mark, (LEN))) { \ |
| SET_ERRNO(HPE_CB_##FOR); \ |
| } \ |
| \ |
| /* We either errored above or got paused; get out */ \ |
| if (HTTP_PARSER_ERRNO(parser) != HPE_OK) { \ |
| return (ER); \ |
| } \ |
| } \ |
| FOR##_mark = NULL; \ |
| } \ |
| } while (0) |
| |
| /* Run the data callback FOR and consume the current byte */ |
| #define CALLBACK_DATA(FOR) \ |
| CALLBACK_DATA_(FOR, p - FOR##_mark, p - data + 1) |
| |
| /* Run the data callback FOR and don't consume the current byte */ |
| #define CALLBACK_DATA_NOADVANCE(FOR) \ |
| CALLBACK_DATA_(FOR, p - FOR##_mark, p - data) |
| |
| /* Set the mark FOR; non-destructive if mark is already set */ |
| #define MARK(FOR) \ |
| do { \ |
| if (!FOR##_mark) { \ |
| FOR##_mark = p; \ |
| } \ |
| } while (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[] = |
| { |
| #define XX(num, name, string) #string, |
| HTTP_METHOD_MAP(XX) |
| #undef XX |
| }; |
| |
| |
| /* 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 |
| }; |
| |
| |
| #if HTTP_PARSER_STRICT |
| # define T(v) 0 |
| #else |
| # define T(v) v |
| #endif |
| |
| |
| static const uint8_t normal_url_char[32] = { |
| /* 0 nul 1 soh 2 stx 3 etx 4 eot 5 enq 6 ack 7 bel */ |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0, |
| /* 8 bs 9 ht 10 nl 11 vt 12 np 13 cr 14 so 15 si */ |
| 0 | T(2) | 0 | 0 | T(16) | 0 | 0 | 0, |
| /* 16 dle 17 dc1 18 dc2 19 dc3 20 dc4 21 nak 22 syn 23 etb */ |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0, |
| /* 24 can 25 em 26 sub 27 esc 28 fs 29 gs 30 rs 31 us */ |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0, |
| /* 32 sp 33 ! 34 " 35 # 36 $ 37 % 38 & 39 ' */ |
| 0 | 2 | 4 | 0 | 16 | 32 | 64 | 128, |
| /* 40 ( 41 ) 42 * 43 + 44 , 45 - 46 . 47 / */ |
| 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, |
| /* 48 0 49 1 50 2 51 3 52 4 53 5 54 6 55 7 */ |
| 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, |
| /* 56 8 57 9 58 : 59 ; 60 < 61 = 62 > 63 ? */ |
| 1 | 2 | 4 | 8 | 16 | 32 | 64 | 0, |
| /* 64 @ 65 A 66 B 67 C 68 D 69 E 70 F 71 G */ |
| 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, |
| /* 72 H 73 I 74 J 75 K 76 L 77 M 78 N 79 O */ |
| 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, |
| /* 80 P 81 Q 82 R 83 S 84 T 85 U 86 V 87 W */ |
| 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, |
| /* 88 X 89 Y 90 Z 91 [ 92 \ 93 ] 94 ^ 95 _ */ |
| 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, |
| /* 96 ` 97 a 98 b 99 c 100 d 101 e 102 f 103 g */ |
| 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, |
| /* 104 h 105 i 106 j 107 k 108 l 109 m 110 n 111 o */ |
| 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, |
| /* 112 p 113 q 114 r 115 s 116 t 117 u 118 v 119 w */ |
| 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, |
| /* 120 x 121 y 122 z 123 { 124 | 125 } 126 ~ 127 del */ |
| 1 | 2 | 4 | 8 | 16 | 32 | 64 | 0, }; |
| |
| #undef T |
| |
| enum state |
| { s_dead = 1 /* important that this is > 0 */ |
| |
| , s_start_req_or_res |
| , s_res_or_resp_H |
| , s_start_res |
| , s_res_H |
| , s_res_HT |
| , s_res_HTT |
| , s_res_HTTP |
| , s_res_first_http_major |
| , s_res_http_major |
| , s_res_first_http_minor |
| , s_res_http_minor |
| , s_res_first_status_code |
| , s_res_status_code |
| , s_res_status |
| , s_res_line_almost_done |
| |
| , s_start_req |
| |
| , s_req_method |
| , s_req_spaces_before_url |
| , s_req_schema |
| , s_req_schema_slash |
| , s_req_schema_slash_slash |
| , s_req_server_start |
| , s_req_server |
| , s_req_server_with_at |
| , s_req_path |
| , s_req_query_string_start |
| , s_req_query_string |
| , s_req_fragment_start |
| , s_req_fragment |
| , s_req_http_start |
| , s_req_http_H |
| , s_req_http_HT |
| , s_req_http_HTT |
| , s_req_http_HTTP |
| , s_req_first_http_major |
| , s_req_http_major |
| , s_req_first_http_minor |
| , s_req_http_minor |
| , s_req_line_almost_done |
| |
| , s_header_field_start |
| , s_header_field |
| , s_header_value_start |
| , s_header_value |
| , s_header_value_lws |
| |
| , s_header_almost_done |
| |
| , s_chunk_size_start |
| , s_chunk_size |
| , s_chunk_parameters |
| , s_chunk_size_almost_done |
| |
| , s_headers_almost_done |
| , s_headers_done |
| |
| /* Important: 's_headers_done' must be the last 'header' state. All |
| * states beyond this must be 'body' states. It is used for overflow |
| * checking. See the PARSING_HEADER() macro. |
| */ |
| |
| , s_chunk_data |
| , s_chunk_data_almost_done |
| , s_chunk_data_done |
| |
| , s_body_identity |
| , s_body_identity_eof |
| |
| , s_message_done |
| }; |
| |
| |
| #define 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_keep_alive |
| , h_matching_connection_close |
| |
| , h_transfer_encoding_chunked |
| , h_connection_keep_alive |
| , h_connection_close |
| }; |
| |
| enum http_host_state |
| { |
| s_http_host_dead = 1 |
| , s_http_userinfo_start |
| , s_http_userinfo |
| , s_http_host_start |
| , s_http_host_v6_start |
| , s_http_host |
| , s_http_host_v6 |
| , s_http_host_v6_end |
| , s_http_host_port_start |
| , s_http_host_port |
| }; |
| |
| /* 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) == ',') |
| |
| #if HTTP_PARSER_STRICT |
| #define TOKEN(c) (tokens[(unsigned char)c]) |
| #define IS_URL_CHAR(c) (BIT_AT(normal_url_char, (unsigned char)c)) |
| #define IS_HOST_CHAR(c) (IS_ALPHANUM(c) || (c) == '.' || (c) == '-') |
| #else |
| #define TOKEN(c) ((c == ' ') ? ' ' : tokens[(unsigned char)c]) |
| #define IS_URL_CHAR(c) \ |
| (BIT_AT(normal_url_char, (unsigned char)c) || ((c) & 0x80)) |
| #define IS_HOST_CHAR(c) \ |
| (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(const 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; |
| } |
| |
| /* The schema must start with an alpha character. After that, it may |
| * consist of digits, '+', '-' or '.', followed by a ':'. |
| */ |
| if (IS_ALPHA(ch)) { |
| return s_req_schema; |
| } |
| |
| break; |
| |
| case s_req_schema: |
| if (IS_ALPHANUM(ch) || ch == '+' || ch == '-' || ch == '.') { |
| return s; |
| } |
| |
| if (ch == ':') { |
| return s_req_schema_slash; |
| } |
| |
| break; |
| |
| case s_req_schema_slash: |
| if (ch == '/') { |
| return s_req_schema_slash_slash; |
| } |
| |
| break; |
| |
| case s_req_schema_slash_slash: |
| if (ch == '/') { |
| return s_req_server_start; |
| } |
| |
| break; |
| |
| case s_req_server_with_at: |
| if (ch == '@') { |
| return s_dead; |
| } |
| |
| /* FALLTHROUGH */ |
| case s_req_server_start: |
| case s_req_server: |
| if (ch == '/') { |
| return s_req_path; |
| } |
| |
| if (ch == '?') { |
| return s_req_query_string_start; |
| } |
| |
| if (ch == '@') { |
| return s_req_server_with_at; |
| } |
| |
| if (IS_USERINFO_CHAR(ch) || ch == '[' || ch == ']') { |
| return s_req_server; |
| } |
| |
| 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_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; |
| } |
| |
| 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_server_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_server_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_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 ' ': |
| 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. 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 (const 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 (const 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 (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; |
| } |
| |
| static enum http_host_state |
| http_parse_host_char(enum http_host_state s, const char ch) { |
| switch(s) { |
| case s_http_userinfo: |
| case s_http_userinfo_start: |
| if (ch == '@') { |
| return s_http_host_start; |
| } |
| |
| if (IS_USERINFO_CHAR(ch)) { |
| return s_http_userinfo; |
| } |
| break; |
| |
| case s_http_host_start: |
| if (ch == '[') { |
| return s_http_host_v6_start; |
| } |
| |
| if (IS_HOST_CHAR(ch)) { |
| return s_http_host; |
| } |
| |
| break; |
| |
| case s_http_host: |
| if (IS_HOST_CHAR(ch)) { |
| return s_http_host; |
| } |
| |
| /* FALLTHROUGH */ |
| case s_http_host_v6_end: |
| if (ch == ':') { |
| return s_http_host_port_start; |
| } |
| |
| break; |
| |
| case s_http_host_v6: |
| if (ch == ']') { |
| return s_http_host_v6_end; |
| } |
| |
| /* FALLTHROUGH */ |
| case s_http_host_v6_start: |
| if (IS_HEX(ch) || ch == ':') { |
| return s_http_host_v6; |
| } |
| |
| break; |
| |
| case s_http_host_port: |
| case s_http_host_port_start: |
| if (IS_NUM(ch)) { |
| return s_http_host_port; |
| } |
| |
| break; |
| |
| default: |
| break; |
| } |
| return s_http_host_dead; |
| } |
| |
| static int |
| http_parse_host(const char * buf, struct http_parser_url *u, int found_at) { |
| enum http_host_state s; |
| |
| const char *p; |
| size_t buflen = u->field_data[UF_HOST].off + u->field_data[UF_HOST].len; |
| |
| if (buflen > UINT16_MAX) |
| return 1; |
| |
| u->field_data[UF_HOST].len = 0; |
| |
| s = found_at ? s_http_userinfo_start : s_http_host_start; |
| |
| for (p = buf + u->field_data[UF_HOST].off; p < buf + buflen; p++) { |
| enum http_host_state new_s = http_parse_host_char(s, *p); |
| |
| if (new_s == s_http_host_dead) { |
| return 1; |
| } |
| |
| switch(new_s) { |
| case s_http_host: |
| if (s != s_http_host) { |
| u->field_data[UF_HOST].off = (uint16_t)(p - buf); |
| } |
| u->field_data[UF_HOST].len++; |
| break; |
| |
| case s_http_host_v6: |
| if (s != s_http_host_v6) { |
| u->field_data[UF_HOST].off = (uint16_t)(p - buf); |
| } |
| u->field_data[UF_HOST].len++; |
| break; |
| |
| case s_http_host_port: |
| if (s != s_http_host_port) { |
| u->field_data[UF_PORT].off = (uint16_t)(p - buf); |
| u->field_data[UF_PORT].len = 0; |
| u->field_set |= (1 << UF_PORT); |
| } |
| u->field_data[UF_PORT].len++; |
| break; |
| |
| case s_http_userinfo: |
| if (s != s_http_userinfo) { |
| u->field_data[UF_USERINFO].off = (uint16_t)(p - buf); |
| u->field_data[UF_USERINFO].len = 0; |
| u->field_set |= (1 << UF_USERINFO); |
| } |
| u->field_data[UF_USERINFO].len++; |
| break; |
| |
| default: |
| break; |
| } |
| s = new_s; |
| } |
| |
| /* Make sure we don't end somewhere unexpected */ |
| switch (s) { |
| case s_http_host_start: |
| case s_http_host_v6_start: |
| case s_http_host_v6: |
| case s_http_userinfo: |
| case s_http_userinfo_start: |
| return 1; |
| default: |
| break; |
| } |
| |
| return 0; |
| } |
| |
| 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; |
| int found_at = 0; |
| |
| if (buflen > UINT16_MAX) |
| return 1; |
| |
| u->port = u->field_set = 0; |
| s = is_connect ? s_req_server_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_server_start: |
| case s_req_query_string_start: |
| case s_req_fragment_start: |
| continue; |
| |
| case s_req_schema: |
| uf = UF_SCHEMA; |
| break; |
| |
| case s_req_server_with_at: |
| found_at = 1; |
| |
| /* FALLTROUGH */ |
| case s_req_server: |
| uf = UF_HOST; |
| 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 = (uint16_t)(p - buf); |
| u->field_data[uf].len = 1; |
| |
| u->field_set |= (1 << uf); |
| old_uf = uf; |
| } |
| |
| /* host must be present if there is a schema */ |
| /* parsing http:///toto will fail */ |
| if ((u->field_set & ((1 << UF_SCHEMA) | (1 << UF_HOST))) != 0) { |
| if (http_parse_host(buf, u, found_at) != 0) { |
| return 1; |
| } |
| } |
| |
| /* CONNECT requests can only contain "hostname:port" */ |
| if (is_connect && u->field_set != ((1 << UF_HOST)|(1 << UF_PORT))) { |
| return 1; |
| } |
| |
| 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"); |
| } |
| } |
| |
| int |
| http_body_is_final(const struct http_parser *parser) { |
| return parser->state == s_message_done; |
| } |
