/* SPDX-License-Identifier: MIT */ /* Based on src/http/ngx_http_parse.c from NGINX copyright Igor Sysoev * * Additional changes are licensed under the same terms as NGINX and * copyright Joyent, Inc. and other Node contributors. All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to * deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or * sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #include #include #include #include #include #include #include #include #ifndef ULLONG_MAX # define ULLONG_MAX ((uint64_t) -1) /* 2^64-1 */ #endif #ifndef MIN # define MIN(a, b) ((a) < (b) ? (a) : (b)) #endif #ifndef ARRAY_SIZE # define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) #endif #ifndef BIT_AT # define BIT_AT(a, i) \ (!!((unsigned int) (a)[(unsigned int) (i) >> 3] & \ (1 << ((unsigned int) (i) & 7)))) #endif #ifndef ELEM_AT # define ELEM_AT(a, i, v) ((unsigned int) (i) < ARRAY_SIZE(a) ? (a)[(i)] : (v)) #endif #define SET_ERRNO(e) (parser->http_errno = (e)) #define CURRENT_STATE() p_state #define UPDATE_STATE(V) (p_state = (enum state)(V)) #ifdef __GNUC__ # define LIKELY(X) __builtin_expect(!!(X), 1) # define UNLIKELY(X) __builtin_expect(!!(X), 0) #else # define LIKELY(X) (X) # define UNLIKELY(X) (X) #endif /* Set the mark FOR; non-destructive if mark is already set */ #define MARK(FOR) \ do { \ if (!FOR##_mark) { \ FOR##_mark = p; \ } \ } while (false) /* Don't allow the total size of the HTTP headers (including the status * line) to exceed HTTP_MAX_HEADER_SIZE. This check is here to protect * embedders against denial-of-service attacks where the attacker feeds * us a never-ending header that the embedder keeps buffering. * * This check is arguably the responsibility of embedders but we're doing * it on the embedder's behalf because most won't bother and this way we * make the web a little safer. HTTP_MAX_HEADER_SIZE is still far bigger * than any reasonable request or response so this should never affect * day-to-day operation. */ static inline int count_header_size(struct http_parser *parser, int bytes) { parser->nread += bytes; if (UNLIKELY(parser->nread > (HTTP_MAX_HEADER_SIZE))) { parser->http_errno = HPE_HEADER_OVERFLOW; return -1; } return 0; } #define PROXY_CONNECTION "proxy-connection" #define CONNECTION "connection" #define CONTENT_LENGTH "content-length" #define TRANSFER_ENCODING "transfer-encoding" #define UPGRADE "upgrade" #define CHUNKED "chunked" #define KEEP_ALIVE "keep-alive" #define CLOSE "close" static const char *method_strings[] = {"DELETE", "GET", "HEAD", "POST", "PUT", "CONNECT", "OPTIONS", "TRACE", "COPY", "LOCK", "MKCOL", "MOVE", "PROPFIND", "PROPPATCH", "SEARCH", "UNLOCK", "BIND", "REBIND", "UNBIND", "ACL", "REPORT", "MKACTIVITY", "CHECKOUT", "MERGE", "M-SEARCH", "NOTIFY", "SUBSCRIBE", "UNSUBSCRIBE", "PATCH", "PURGE", "MKCALENDAR", "LINK", "UNLINK"}; /* Tokens as defined by rfc 2616. Also lowercases them. * token = 1* * separators = "(" | ")" | "<" | ">" | "@" * | "," | ";" | ":" | "\" | <"> * | "/" | "[" | "]" | "?" | "=" * | "{" | "}" | SP | HT */ static const char tokens[256] = { /* 0 nul 1 soh 2 stx 3 etx 4 eot 5 enq 6 ack 7 bel */ 0, 0, 0, 0, 0, 0, 0, 0, /* 8 bs 9 ht 10 nl 11 vt 12 np 13 cr 14 so 15 si */ 0, 0, 0, 0, 0, 0, 0, 0, /* 16 dle 17 dc1 18 dc2 19 dc3 20 dc4 21 nak 22 syn 23 etb */ 0, 0, 0, 0, 0, 0, 0, 0, /* 24 can 25 em 26 sub 27 esc 28 fs 29 gs 30 rs 31 us */ 0, 0, 0, 0, 0, 0, 0, 0, /* 32 sp 33 ! 34 " 35 # 36 $ 37 % 38 & 39 ' */ 0, '!', 0, '#', '$', '%', '&', '\'', /* 40 ( 41 ) 42 * 43 + 44 , 45 - 46 . 47 / */ 0, 0, '*', '+', 0, '-', '.', 0, /* 48 0 49 1 50 2 51 3 52 4 53 5 54 6 55 7 */ '0', '1', '2', '3', '4', '5', '6', '7', /* 56 8 57 9 58 : 59 ; 60 < 61 = 62 > 63 ? */ '8', '9', 0, 0, 0, 0, 0, 0, /* 64 @ 65 A 66 B 67 C 68 D 69 E 70 F 71 G */ 0, 'a', 'b', 'c', 'd', 'e', 'f', 'g', /* 72 H 73 I 74 J 75 K 76 L 77 M 78 N 79 O */ 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', /* 80 P 81 Q 82 R 83 S 84 T 85 U 86 V 87 W */ 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', /* 88 X 89 Y 90 Z 91 [ 92 \ 93 ] 94 ^ 95 _ */ 'x', 'y', 'z', 0, 0, 0, '^', '_', /* 96 ` 97 a 98 b 99 c 100 d 101 e 102 f 103 g */ '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', /* 104 h 105 i 106 j 107 k 108 l 109 m 110 n 111 o */ 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', /* 112 p 113 q 114 r 115 s 116 t 117 u 118 v 119 w */ 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', /* 120 x 121 y 122 z 123 { 124 | 125 } 126 ~ 127 del */ 'x', 'y', 'z', 0, '|', 0, '~', 0 }; static const int8_t unhex[256] = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }; #define PARSING_HEADER(state) (state <= s_headers_done) enum header_states { h_general = 0, h_C, h_CO, h_CON, h_matching_connection, h_matching_proxy_connection, h_matching_content_length, h_matching_transfer_encoding, h_matching_upgrade, h_connection, h_content_length, h_transfer_encoding, h_upgrade, h_matching_transfer_encoding_chunked, h_matching_connection_token_start, h_matching_connection_keep_alive, h_matching_connection_close, h_matching_connection_upgrade, h_matching_connection_token, h_transfer_encoding_chunked, h_connection_keep_alive, h_connection_close, h_connection_upgrade }; static inline int cb_notify(struct http_parser *parser, enum state *current_state, http_cb cb, int cb_error, size_t *parsed, size_t already_parsed) { __ASSERT_NO_MSG(HTTP_PARSER_ERRNO(parser) == HPE_OK); if (cb == NULL) { return 0; } parser->state = *current_state; if (UNLIKELY(cb(parser) != 0)) { SET_ERRNO(cb_error); } *current_state = parser->state; /* We either errored above or got paused; get out */ if (UNLIKELY(HTTP_PARSER_ERRNO(parser) != HPE_OK)) { *parsed = already_parsed; return -HTTP_PARSER_ERRNO(parser); } return 0; } static inline int cb_data(struct http_parser *parser, http_data_cb cb, int cb_error, enum state *current_state, size_t *parsed, size_t already_parsed, const char **mark, size_t len) { int rc; __ASSERT_NO_MSG(HTTP_PARSER_ERRNO(parser) == HPE_OK); if (*mark == NULL) { return 0; } if (cb == NULL) { goto lb_end; } parser->state = *current_state; rc = cb(parser, *mark, len); if (UNLIKELY(rc != 0)) { SET_ERRNO(cb_error); } *current_state = parser->state; /* We either errored above or got paused; get out */ if (UNLIKELY(HTTP_PARSER_ERRNO(parser) != HPE_OK)) { *parsed = already_parsed; return -HTTP_PARSER_ERRNO(parser); } lb_end: *mark = NULL; return 0; } /* Macros for character classes; depends on strict-mode */ #define CR '\r' #define LF '\n' #define LOWER(c) (unsigned char)(c | 0x20) #define IS_ALPHA(c) (LOWER(c) >= 'a' && LOWER(c) <= 'z') #define IS_NUM(c) ((c) >= '0' && (c) <= '9') #define IS_ALPHANUM(c) (IS_ALPHA(c) || IS_NUM(c)) #define IS_HEX(c) (IS_NUM(c) || (LOWER(c) >= 'a' && LOWER(c) <= 'f')) #define IS_MARK(c) ((c) == '-' || (c) == '_' || (c) == '.' || \ (c) == '!' || (c) == '~' || (c) == '*' || \ (c) == '\'' || (c) == '(' || (c) == ')') #define IS_USERINFO_CHAR(c) (IS_ALPHANUM(c) || IS_MARK(c) || (c) == '%' || \ (c) == ';' || (c) == ':' || (c) == '&' || \ (c) == '=' || (c) == '+' || (c) == '$' || \ (c) == ',') #define STRICT_TOKEN(c) (tokens[(unsigned char)c]) #ifdef HTTP_PARSER_STRICT #define TOKEN(c) (tokens[(unsigned char)c]) #define IS_HOST_CHAR(c) (IS_ALPHANUM(c) || (c) == '.' || (c) == '-') #else #define TOKEN(c) ((c == ' ') ? ' ' : tokens[(unsigned char)c]) #define IS_HOST_CHAR(c) \ (IS_ALPHANUM(c) || (c) == '.' || (c) == '-' || (c) == '_') #endif /** * Verify that a char is a valid visible (printable) US-ASCII * character or %x80-FF **/ #define IS_HEADER_CHAR(ch) \ (ch == CR || ch == LF || ch == 9 || \ ((unsigned char)ch > 31 && ch != 127)) #define start_state (parser->type == HTTP_REQUEST ? s_start_req : s_start_res) #ifdef HTTP_PARSER_STRICT static inline int strict_check(struct http_parser *parser, int c) { if (c) { parser->http_errno = HPE_STRICT; return -1; } return 0; } # define NEW_MESSAGE() (http_should_keep_alive(parser) ? start_state : s_dead) #else static inline int strict_check(struct http_parser *parser, int c) { (void)parser; (void)c; return 0; } # define NEW_MESSAGE() start_state #endif static struct { const char *name; const char *description; } http_strerror_tab[] = { {"HPE_OK", "success"}, {"HPE_CB_message_begin", "the on_message_begin callback failed"}, {"HPE_CB_url", "the on_url callback failed"}, {"HPE_CB_header_field", "the on_header_field callback failed"}, {"HPE_CB_header_value", "the on_header_value callback failed"}, {"HPE_CB_headers_complete", "the on_headers_complete callback failed"}, {"HPE_CB_body", "the on_body callback failed"}, {"HPE_CB_message_complete", "the on_message_complete callback failed"}, {"HPE_CB_status", "the on_status callback failed"}, {"HPE_CB_chunk_header", "the on_chunk_header callback failed"}, {"HPE_CB_chunk_complete", "the on_chunk_complete callback failed"}, {"HPE_INVALID_EOF_STATE", "stream ended at an unexpected time"}, {"HPE_HEADER_OVERFLOW", "too many header bytes seen; " "overflow detected"}, {"HPE_CLOSED_CONNECTION", "data received after completed connection: " "close message"}, {"HPE_INVALID_VERSION", "invalid HTTP version"}, {"HPE_INVALID_STATUS", "invalid HTTP status code"}, {"HPE_INVALID_METHOD", "invalid HTTP method"}, {"HPE_INVALID_URL", "invalid URL"}, {"HPE_INVALID_HOST", "invalid host"}, {"HPE_INVALID_PORT", "invalid port"}, {"HPE_INVALID_PATH", "invalid path"}, {"HPE_INVALID_QUERY_STRING", "invalid query string"}, {"HPE_INVALID_FRAGMENT", "invalid fragment"}, {"HPE_LF_EXPECTED", "LF character expected"}, {"HPE_INVALID_HEADER_TOKEN", "invalid character in header"}, {"HPE_INVALID_CONTENT_LENGTH", "invalid character in content-length " "header"}, {"HPE_UNEXPECTED_CONTENT_LENGTH", "unexpected content-length header"}, {"HPE_INVALID_CHUNK_SIZE", "invalid character in chunk size header"}, {"HPE_INVALID_CONSTANT", "invalid constant string"}, {"HPE_INVALID_INTERNAL_STATE", "encountered unexpected internal state"}, {"HPE_STRICT", "strict mode assertion failed"}, {"HPE_PAUSED", "parser is paused"}, {"HPE_UNKNOWN", "an unknown error occurred"} }; int http_message_needs_eof(const struct http_parser *parser); static int parser_header_state(struct http_parser *parser, char ch, char c) { int cond1; switch (parser->header_state) { case h_general: break; case h_C: parser->index++; parser->header_state = (c == 'o' ? h_CO : h_general); break; case h_CO: parser->index++; parser->header_state = (c == 'n' ? h_CON : h_general); break; case h_CON: parser->index++; switch (c) { case 'n': parser->header_state = h_matching_connection; break; case 't': parser->header_state = h_matching_content_length; break; default: parser->header_state = h_general; break; } break; /* connection */ case h_matching_connection: parser->index++; cond1 = parser->index > sizeof(CONNECTION) - 1; if (cond1 || c != CONNECTION[parser->index]) { parser->header_state = h_general; } else if (parser->index == sizeof(CONNECTION) - 2) { parser->header_state = h_connection; } break; /* proxy-connection */ case h_matching_proxy_connection: parser->index++; cond1 = parser->index > sizeof(PROXY_CONNECTION) - 1; if (cond1 || c != PROXY_CONNECTION[parser->index]) { parser->header_state = h_general; } else if (parser->index == sizeof(PROXY_CONNECTION) - 2) { parser->header_state = h_connection; } break; /* content-length */ case h_matching_content_length: parser->index++; cond1 = parser->index > sizeof(CONTENT_LENGTH) - 1; if (cond1 || c != CONTENT_LENGTH[parser->index]) { parser->header_state = h_general; } else if (parser->index == sizeof(CONTENT_LENGTH) - 2) { parser->header_state = h_content_length; } break; /* transfer-encoding */ case h_matching_transfer_encoding: parser->index++; cond1 = parser->index > sizeof(TRANSFER_ENCODING) - 1; if (cond1 || c != TRANSFER_ENCODING[parser->index]) { parser->header_state = h_general; } else if (parser->index == sizeof(TRANSFER_ENCODING) - 2) { parser->header_state = h_transfer_encoding; } break; /* upgrade */ case h_matching_upgrade: parser->index++; cond1 = parser->index > sizeof(UPGRADE) - 1; if (cond1 || c != UPGRADE[parser->index]) { parser->header_state = h_general; } else if (parser->index == sizeof(UPGRADE) - 2) { parser->header_state = h_upgrade; } break; case h_connection: case h_content_length: case h_transfer_encoding: case h_upgrade: if (ch != ' ') { parser->header_state = h_general; } break; default: __ASSERT_NO_MSG(0 && "Unknown header_state"); break; } return 0; } static int header_states(struct http_parser *parser, const char *data, size_t len, const char **ptr, enum state *p_state, enum header_states *header_state, char ch, char c) { enum header_states h_state = *header_state; const char *p = *ptr; int cond1; switch (h_state) { case h_general: { size_t limit = data + len - p; const char *p_cr; const char *p_lf; limit = MIN(limit, HTTP_MAX_HEADER_SIZE); p_cr = (const char *)memchr(p, CR, limit); p_lf = (const char *)memchr(p, LF, limit); if (p_cr != NULL) { if (p_lf != NULL && p_cr >= p_lf) { p = p_lf; } else { p = p_cr; } } else if (UNLIKELY(p_lf != NULL)) { p = p_lf; } else { p = data + len; } --p; break; } case h_connection: case h_transfer_encoding: __ASSERT_NO_MSG(0 && "Shouldn't get here."); break; case h_content_length: { uint64_t t; uint64_t value; if (ch == ' ') { break; } if (UNLIKELY(!IS_NUM(ch))) { SET_ERRNO(HPE_INVALID_CONTENT_LENGTH); parser->header_state = h_state; return -1; } t = parser->content_length; t *= 10U; t += ch - '0'; /* Overflow? Test against a conservative limit for simplicity */ value = (ULLONG_MAX - 10) / 10; if (UNLIKELY(value < parser->content_length)) { SET_ERRNO(HPE_INVALID_CONTENT_LENGTH); parser->header_state = h_state; return -1; } parser->content_length = t; break; } /* Transfer-Encoding: chunked */ case h_matching_transfer_encoding_chunked: parser->index++; cond1 = parser->index > sizeof(CHUNKED) - 1; if (cond1 || c != CHUNKED[parser->index]) { h_state = h_general; } else if (parser->index == sizeof(CHUNKED) - 2) { h_state = h_transfer_encoding_chunked; } break; case h_matching_connection_token_start: /* looking for 'Connection: keep-alive' */ if (c == 'k') { h_state = h_matching_connection_keep_alive; /* looking for 'Connection: close' */ } else if (c == 'c') { h_state = h_matching_connection_close; } else if (c == 'u') { h_state = h_matching_connection_upgrade; } else if (STRICT_TOKEN(c)) { h_state = h_matching_connection_token; } else if (c == ' ' || c == '\t') { /* Skip lws */ } else { h_state = h_general; } break; /* looking for 'Connection: keep-alive' */ case h_matching_connection_keep_alive: parser->index++; cond1 = parser->index > sizeof(KEEP_ALIVE) - 1; if (cond1 || c != KEEP_ALIVE[parser->index]) { h_state = h_matching_connection_token; } else if (parser->index == sizeof(KEEP_ALIVE) - 2) { h_state = h_connection_keep_alive; } break; /* looking for 'Connection: close' */ case h_matching_connection_close: parser->index++; cond1 = parser->index > sizeof(CLOSE) - 1; if (cond1 || c != CLOSE[parser->index]) { h_state = h_matching_connection_token; } else if (parser->index == sizeof(CLOSE) - 2) { h_state = h_connection_close; } break; /* looking for 'Connection: upgrade' */ case h_matching_connection_upgrade: parser->index++; cond1 = parser->index > sizeof(UPGRADE) - 1; if (cond1 || c != UPGRADE[parser->index]) { h_state = h_matching_connection_token; } else if (parser->index == sizeof(UPGRADE) - 2) { h_state = h_connection_upgrade; } break; case h_matching_connection_token: if (ch == ',') { h_state = h_matching_connection_token_start; parser->index = 0U; } break; case h_transfer_encoding_chunked: if (ch != ' ') { h_state = h_general; } break; case h_connection_keep_alive: case h_connection_close: case h_connection_upgrade: if (ch == ',') { if (h_state == h_connection_keep_alive) { parser->flags |= F_CONNECTION_KEEP_ALIVE; } else if (h_state == h_connection_close) { parser->flags |= F_CONNECTION_CLOSE; } else if (h_state == h_connection_upgrade) { parser->flags |= F_CONNECTION_UPGRADE; } h_state = h_matching_connection_token_start; parser->index = 0U; } else if (ch != ' ') { h_state = h_matching_connection_token; } break; default: *p_state = s_header_value; h_state = h_general; break; } *header_state = h_state; *ptr = p; return 0; } static int zero_content_length(struct http_parser *parser, const struct http_parser_settings *settings, enum state *current_state, size_t *parsed, const char *p, const char *data) { enum state p_state = *current_state; int rc; if (parser->content_length == 0U) { /* Content-Length header given but zero: * Content-Length: 0\r\n */ UPDATE_STATE(NEW_MESSAGE()); rc = cb_notify(parser, &p_state, settings->on_message_complete, HPE_CB_message_complete, parsed, p - data + 1); if (rc != 0) { return rc; } } else if (parser->content_length != ULLONG_MAX) { /* Content-Length header given and * non-zero */ UPDATE_STATE(s_body_identity); } else { if (!http_message_needs_eof(parser)) { /* Assume content-length 0 - * read the next */ UPDATE_STATE(NEW_MESSAGE()); rc = cb_notify(parser, &p_state, settings->on_message_complete, HPE_CB_message_complete, parsed, p - data + 1); if (rc != 0) { return rc; } } else { /* Read body until EOF */ UPDATE_STATE(s_body_identity_eof); } } *current_state = p_state; return 0; } static int parser_execute(struct http_parser *parser, const struct http_parser_settings *settings, const char *data, size_t len, size_t *parsed) { const unsigned int lenient = parser->lenient_http_headers; enum state p_state = (enum state) parser->state; const char *p = data; const char *header_field_mark = 0; const char *header_value_mark = 0; const char *url_mark = 0; const char *body_mark = 0; const char *status_mark = 0; int8_t unhex_val; int rc; char ch; char c; *parsed = 0; /* We're in an error state. Don't bother doing anything. */ if (HTTP_PARSER_ERRNO(parser) != HPE_OK) { return 0; } if (len == 0) { switch (CURRENT_STATE()) { case s_body_identity_eof: /* Use of CALLBACK_NOTIFY() here would erroneously * return 1 byte read if * we got paused. */ cb_notify(parser, &p_state, settings->on_message_complete, HPE_CB_message_complete, parsed, p - data); return 0; case s_dead: case s_start_req_or_res: case s_start_res: case s_start_req: return 0; default: SET_ERRNO(HPE_INVALID_EOF_STATE); return 1; } } if (CURRENT_STATE() == s_header_field) { header_field_mark = data; } if (CURRENT_STATE() == s_header_value) { header_value_mark = data; } switch (CURRENT_STATE()) { case s_req_path: case s_req_schema: case s_req_schema_slash: case s_req_schema_slash_slash: case s_req_server_start: case s_req_server: case s_req_server_with_at: case s_req_query_string_start: case s_req_query_string: case s_req_fragment_start: case s_req_fragment: url_mark = data; break; case s_res_status: status_mark = data; break; default: break; } for (p = data; p != data + len; p++) { ch = *p; if (PARSING_HEADER(CURRENT_STATE())) { rc = count_header_size(parser, 1); if (rc != 0) { goto error; } } reexecute: switch (CURRENT_STATE()) { case s_dead: /* this state is used after a 'Connection: close' * message * the parser will error out if it reads another message */ if (LIKELY(ch == CR || ch == LF)) { break; } SET_ERRNO(HPE_CLOSED_CONNECTION); goto error; case s_start_req_or_res: { if (ch == CR || ch == LF) { break; } parser->flags = 0U; parser->content_length = ULLONG_MAX; if (ch == 'H') { UPDATE_STATE(s_res_or_resp_H); rc = cb_notify(parser, &p_state, settings->on_message_begin, HPE_CB_message_begin, parsed, p - data + 1); if (rc != 0) { return rc; } } else { parser->type = HTTP_REQUEST; UPDATE_STATE(s_start_req); goto reexecute; } break; } case s_res_or_resp_H: if (ch == 'T') { parser->type = HTTP_RESPONSE; UPDATE_STATE(s_res_HT); } else { if (UNLIKELY(ch != 'E')) { SET_ERRNO(HPE_INVALID_CONSTANT); goto error; } parser->type = HTTP_REQUEST; parser->method = HTTP_HEAD; parser->index = 2U; UPDATE_STATE(s_req_method); } break; case s_start_res: { parser->flags = 0U; parser->content_length = ULLONG_MAX; switch (ch) { case 'H': UPDATE_STATE(s_res_H); break; case CR: case LF: break; default: SET_ERRNO(HPE_INVALID_CONSTANT); goto error; } rc = cb_notify(parser, &p_state, settings->on_message_begin, HPE_CB_message_begin, parsed, p - data + 1); if (rc != 0) { return rc; } break; } case s_res_H: rc = strict_check(parser, ch != 'T'); if (rc != 0) { goto error; } UPDATE_STATE(s_res_HT); break; case s_res_HT: rc = strict_check(parser, ch != 'T'); if (rc != 0) { goto error; } UPDATE_STATE(s_res_HTT); break; case s_res_HTT: rc = strict_check(parser, ch != 'P'); if (rc != 0) { goto error; } UPDATE_STATE(s_res_HTTP); break; case s_res_HTTP: rc = strict_check(parser, ch != '/'); if (rc != 0) { goto error; } UPDATE_STATE(s_res_first_http_major); break; case s_res_first_http_major: if (UNLIKELY(ch < '0' || ch > '9')) { SET_ERRNO(HPE_INVALID_VERSION); goto error; } parser->http_major = ch - '0'; UPDATE_STATE(s_res_http_major); break; /* major HTTP version or dot */ case s_res_http_major: { if (ch == '.') { UPDATE_STATE(s_res_first_http_minor); break; } if (!IS_NUM(ch)) { SET_ERRNO(HPE_INVALID_VERSION); goto error; } parser->http_major *= 10U; parser->http_major += ch - '0'; if (UNLIKELY(parser->http_major > 999)) { SET_ERRNO(HPE_INVALID_VERSION); goto error; } break; } /* first digit of minor HTTP version */ case s_res_first_http_minor: if (UNLIKELY(!IS_NUM(ch))) { SET_ERRNO(HPE_INVALID_VERSION); goto error; } parser->http_minor = ch - '0'; UPDATE_STATE(s_res_http_minor); break; /* minor HTTP version or end of request line */ case s_res_http_minor: { if (ch == ' ') { UPDATE_STATE(s_res_first_status_code); break; } if (UNLIKELY(!IS_NUM(ch))) { SET_ERRNO(HPE_INVALID_VERSION); goto error; } parser->http_minor *= 10U; parser->http_minor += ch - '0'; if (UNLIKELY(parser->http_minor > 999)) { SET_ERRNO(HPE_INVALID_VERSION); goto error; } break; } case s_res_first_status_code: { if (!IS_NUM(ch)) { if (ch == ' ') { break; } SET_ERRNO(HPE_INVALID_STATUS); goto error; } parser->status_code = ch - '0'; UPDATE_STATE(s_res_status_code); break; } case s_res_status_code: { if (!IS_NUM(ch)) { /* Numeric status only */ if ((ch == CR) || (ch == LF)) { const char *no_status_txt = ""; rc = cb_data(parser, settings->on_status, HPE_CB_status, &p_state, parsed, p - data + 1, &no_status_txt, 0); if (rc != 0) { return rc; } } switch (ch) { case ' ': UPDATE_STATE(s_res_status_start); break; case CR: UPDATE_STATE(s_res_line_almost_done); break; case LF: UPDATE_STATE(s_header_field_start); break; default: SET_ERRNO(HPE_INVALID_STATUS); goto error; } break; } parser->status_code *= 10U; parser->status_code += ch - '0'; if (UNLIKELY(parser->status_code > 999)) { SET_ERRNO(HPE_INVALID_STATUS); goto error; } break; } case s_res_status_start: { if (!status_mark && ((ch == CR) || (ch == LF))) { /* Numeric status only */ const char *no_status_txt = ""; rc = cb_data(parser, settings->on_status, HPE_CB_status, &p_state, parsed, p - data + 1, &no_status_txt, 0); if (rc != 0) { return rc; } } if (ch == CR) { UPDATE_STATE(s_res_line_almost_done); break; } if (ch == LF) { UPDATE_STATE(s_header_field_start); break; } MARK(status); UPDATE_STATE(s_res_status); parser->index = 0U; break; } case s_res_status: if (ch == CR) { UPDATE_STATE(s_res_line_almost_done); rc = cb_data(parser, settings->on_status, HPE_CB_status, &p_state, parsed, p - data + 1, &status_mark, p - status_mark); if (rc != 0) { return rc; } break; } if (ch == LF) { UPDATE_STATE(s_header_field_start); rc = cb_data(parser, settings->on_status, HPE_CB_status, &p_state, parsed, p - data + 1, &status_mark, p - status_mark); if (rc != 0) { return rc; } break; } break; case s_res_line_almost_done: rc = strict_check(parser, ch != LF); if (rc != 0) { goto error; } UPDATE_STATE(s_header_field_start); break; case s_start_req: { if (ch == CR || ch == LF) { break; } parser->flags = 0U; parser->content_length = ULLONG_MAX; if (UNLIKELY(!IS_ALPHA(ch))) { SET_ERRNO(HPE_INVALID_METHOD); goto error; } parser->method = (enum http_method) 0; parser->index = 1U; switch (ch) { case 'A': parser->method = HTTP_ACL; break; case 'B': parser->method = HTTP_BIND; break; case 'C': parser->method = HTTP_CONNECT; /* or COPY, CHECKOUT */ break; case 'D': parser->method = HTTP_DELETE; break; case 'G': parser->method = HTTP_GET; break; case 'H': parser->method = HTTP_HEAD; break; case 'L': parser->method = HTTP_LOCK; /* or LINK */ break; case 'M': parser->method = HTTP_MKCOL; /* or MOVE, MKACTIVITY, MERGE, M-SEARCH, * MKCALENDAR */ break; case 'N': parser->method = HTTP_NOTIFY; break; case 'O': parser->method = HTTP_OPTIONS; break; case 'P': parser->method = HTTP_POST; /* or PROPFIND|PROPPATCH|PUT|PATCH|PURGE */ break; case 'R': parser->method = HTTP_REPORT; /* or REBIND */ break; case 'S': parser->method = HTTP_SUBSCRIBE; /* or SEARCH */ break; case 'T': parser->method = HTTP_TRACE; break; case 'U': parser->method = HTTP_UNLOCK; /* or UNSUBSCRIBE, UNBIND, UNLINK */ break; default: SET_ERRNO(HPE_INVALID_METHOD); goto error; } UPDATE_STATE(s_req_method); rc = cb_notify(parser, &p_state, settings->on_message_begin, HPE_CB_message_begin, parsed, p - data + 1); if (rc != 0) { return rc; } break; } case s_req_method: { const char *matcher; if (UNLIKELY(ch == '\0')) { SET_ERRNO(HPE_INVALID_METHOD); goto error; } matcher = method_strings[parser->method]; if (ch == ' ' && matcher[parser->index] == '\0') { UPDATE_STATE(s_req_spaces_before_url); } else if (ch == matcher[parser->index]) { ; /* nada */ } else if (IS_ALPHA(ch)) { uint64_t sw_option = parser->method << 16 | parser->index << 8 | ch; switch (sw_option) { case (HTTP_POST << 16 | 1 << 8 | 'U'): parser->method = HTTP_PUT; break; case (HTTP_POST << 16 | 1 << 8 | 'A'): parser->method = HTTP_PATCH; break; case (HTTP_CONNECT << 16 | 1 << 8 | 'H'): parser->method = HTTP_CHECKOUT; break; case (HTTP_CONNECT << 16 | 2 << 8 | 'P'): parser->method = HTTP_COPY; break; case (HTTP_MKCOL << 16 | 1 << 8 | 'O'): parser->method = HTTP_MOVE; break; case (HTTP_MKCOL << 16 | 1 << 8 | 'E'): parser->method = HTTP_MERGE; break; case (HTTP_MKCOL << 16 | 2 << 8 | 'A'): parser->method = HTTP_MKACTIVITY; break; case (HTTP_MKCOL << 16 | 3 << 8 | 'A'): parser->method = HTTP_MKCALENDAR; break; case (HTTP_SUBSCRIBE << 16 | 1 << 8 | 'E'): parser->method = HTTP_SEARCH; break; case (HTTP_REPORT << 16 | 2 << 8 | 'B'): parser->method = HTTP_REBIND; break; case (HTTP_POST << 16 | 1 << 8 | 'R'): parser->method = HTTP_PROPFIND; break; case (HTTP_PROPFIND << 16 | 4 << 8 | 'P'): parser->method = HTTP_PROPPATCH; break; case (HTTP_PUT << 16 | 2 << 8 | 'R'): parser->method = HTTP_PURGE; break; case (HTTP_LOCK << 16 | 1 << 8 | 'I'): parser->method = HTTP_LINK; break; case (HTTP_UNLOCK << 16 | 2 << 8 | 'S'): parser->method = HTTP_UNSUBSCRIBE; break; case (HTTP_UNLOCK << 16 | 2 << 8 | 'B'): parser->method = HTTP_UNBIND; break; case (HTTP_UNLOCK << 16 | 3 << 8 | 'I'): parser->method = HTTP_UNLINK; break; default: parser->http_errno = HPE_INVALID_METHOD; goto error; } } else if (ch == '-' && parser->index == 1U && parser->method == HTTP_MKCOL) { parser->method = HTTP_MSEARCH; } else { SET_ERRNO(HPE_INVALID_METHOD); goto error; } ++parser->index; break; } case s_req_spaces_before_url: { if (ch == ' ') { break; } MARK(url); if (parser->method == HTTP_CONNECT) { UPDATE_STATE(s_req_server_start); } UPDATE_STATE(parse_url_char(CURRENT_STATE(), ch)); if (UNLIKELY(CURRENT_STATE() == s_dead)) { SET_ERRNO(HPE_INVALID_URL); goto error; } break; } case s_req_schema: case s_req_schema_slash: case s_req_schema_slash_slash: case s_req_server_start: { switch (ch) { /* No whitespace allowed here */ case ' ': case CR: case LF: SET_ERRNO(HPE_INVALID_URL); goto error; default: UPDATE_STATE (parse_url_char(CURRENT_STATE(), ch)); if (UNLIKELY(CURRENT_STATE() == s_dead)) { SET_ERRNO(HPE_INVALID_URL); goto error; } } break; } case s_req_server: case s_req_server_with_at: case s_req_path: case s_req_query_string_start: case s_req_query_string: case s_req_fragment_start: case s_req_fragment: { switch (ch) { case ' ': UPDATE_STATE(s_req_http_start); rc = cb_data(parser, settings->on_url, HPE_CB_url, &p_state, parsed, p - data + 1, &url_mark, p - url_mark); if (rc != 0) { return rc; } break; case CR: case LF: parser->http_major = 0U; parser->http_minor = 9U; UPDATE_STATE((ch == CR) ? s_req_line_almost_done : s_header_field_start); rc = cb_data(parser, settings->on_url, HPE_CB_url, &p_state, parsed, p - data + 1, &url_mark, p - url_mark); if (rc != 0) { return rc; } break; default: UPDATE_STATE (parse_url_char(CURRENT_STATE(), ch)); if (UNLIKELY(CURRENT_STATE() == s_dead)) { SET_ERRNO(HPE_INVALID_URL); goto error; } } break; } case s_req_http_start: switch (ch) { case 'H': UPDATE_STATE(s_req_http_H); break; case ' ': break; default: SET_ERRNO(HPE_INVALID_CONSTANT); goto error; } break; case s_req_http_H: rc = strict_check(parser, ch != 'T'); if (rc != 0) { goto error; } UPDATE_STATE(s_req_http_HT); break; case s_req_http_HT: rc = strict_check(parser, ch != 'T'); if (rc != 0) { goto error; } UPDATE_STATE(s_req_http_HTT); break; case s_req_http_HTT: rc = strict_check(parser, ch != 'P'); if (rc != 0) { goto error; } UPDATE_STATE(s_req_http_HTTP); break; case s_req_http_HTTP: rc = strict_check(parser, ch != '/'); if (rc != 0) { goto error; } UPDATE_STATE(s_req_first_http_major); break; /* first digit of major HTTP version */ case s_req_first_http_major: if (UNLIKELY(ch < '1' || ch > '9')) { SET_ERRNO(HPE_INVALID_VERSION); goto error; } parser->http_major = ch - '0'; UPDATE_STATE(s_req_http_major); break; /* major HTTP version or dot */ case s_req_http_major: { if (ch == '.') { UPDATE_STATE(s_req_first_http_minor); break; } if (UNLIKELY(!IS_NUM(ch))) { SET_ERRNO(HPE_INVALID_VERSION); goto error; } parser->http_major *= 10U; parser->http_major += ch - '0'; if (UNLIKELY(parser->http_major > 999)) { SET_ERRNO(HPE_INVALID_VERSION); goto error; } break; } /* first digit of minor HTTP version */ case s_req_first_http_minor: if (UNLIKELY(!IS_NUM(ch))) { SET_ERRNO(HPE_INVALID_VERSION); goto error; } parser->http_minor = ch - '0'; UPDATE_STATE(s_req_http_minor); break; /* minor HTTP version or end of request line */ case s_req_http_minor: { if (ch == CR) { UPDATE_STATE(s_req_line_almost_done); break; } if (ch == LF) { UPDATE_STATE(s_header_field_start); break; } /* XXX allow spaces after digit? */ if (UNLIKELY(!IS_NUM(ch))) { SET_ERRNO(HPE_INVALID_VERSION); goto error; } parser->http_minor *= 10U; parser->http_minor += ch - '0'; if (UNLIKELY(parser->http_minor > 999)) { SET_ERRNO(HPE_INVALID_VERSION); goto error; } break; } /* end of request line */ case s_req_line_almost_done: { if (UNLIKELY(ch != LF)) { SET_ERRNO(HPE_LF_EXPECTED); goto error; } UPDATE_STATE(s_header_field_start); break; } case s_header_field_start: { if (ch == CR) { UPDATE_STATE(s_headers_almost_done); break; } if (ch == LF) { /* they might be just sending \n instead of \r\n * so this would be * the second \n to denote the end of headers */ UPDATE_STATE(s_headers_almost_done); goto reexecute; } c = TOKEN(ch); if (UNLIKELY(!c)) { SET_ERRNO(HPE_INVALID_HEADER_TOKEN); goto error; } MARK(header_field); parser->index = 0U; UPDATE_STATE(s_header_field); switch (c) { case 'c': parser->header_state = h_C; break; case 'p': parser->header_state = h_matching_proxy_connection; break; case 't': parser->header_state = h_matching_transfer_encoding; break; case 'u': parser->header_state = h_matching_upgrade; break; default: parser->header_state = h_general; break; } break; } case s_header_field: { const char *start = p; for (; p != data + len; p++) { ch = *p; c = TOKEN(ch); if (!c) { break; } parser_header_state(parser, ch, c); } rc = count_header_size(parser, p - start); if (rc != 0) { goto error; } if (p == data + len) { --p; break; } if (ch == ':') { UPDATE_STATE(s_header_value_discard_ws); rc = cb_data(parser, settings->on_header_field, HPE_CB_header_field, &p_state, parsed, p - data + 1, &header_field_mark, p - header_field_mark); if (rc != 0) { return rc; } break; } SET_ERRNO(HPE_INVALID_HEADER_TOKEN); goto error; } case s_header_value_discard_ws: if (ch == ' ' || ch == '\t') { break; } if (ch == CR) { UPDATE_STATE (s_header_value_discard_ws_almost_done); break; } if (ch == LF) { UPDATE_STATE(s_header_value_discard_lws); break; } __fallthrough; case s_header_value_start: { MARK(header_value); UPDATE_STATE(s_header_value); parser->index = 0U; c = LOWER(ch); switch (parser->header_state) { case h_upgrade: parser->flags |= F_UPGRADE; parser->header_state = h_general; break; case h_transfer_encoding: /* looking for 'Transfer-Encoding: chunked' */ if ('c' == c) { parser->header_state = h_matching_transfer_encoding_chunked; } else { parser->header_state = h_general; } break; case h_content_length: if (UNLIKELY(!IS_NUM(ch))) { SET_ERRNO(HPE_INVALID_CONTENT_LENGTH); goto error; } if (parser->flags & F_CONTENTLENGTH) { SET_ERRNO (HPE_UNEXPECTED_CONTENT_LENGTH); goto error; } parser->flags |= F_CONTENTLENGTH; parser->content_length = ch - '0'; break; case h_connection: /* looking for 'Connection: keep-alive' */ if (c == 'k') { parser->header_state = h_matching_connection_keep_alive; /* looking for 'Connection: close' */ } else if (c == 'c') { parser->header_state = h_matching_connection_close; } else if (c == 'u') { parser->header_state = h_matching_connection_upgrade; } else { parser->header_state = h_matching_connection_token; } break; /* Multi-value `Connection` header */ case h_matching_connection_token_start: break; default: parser->header_state = h_general; break; } break; } case s_header_value: { const char *start = p; enum header_states h_state = (enum header_states)parser->header_state; for (; p != data + len; p++) { ch = *p; if (ch == CR) { UPDATE_STATE(s_header_almost_done); parser->header_state = h_state; rc = cb_data(parser, settings->on_header_value, HPE_CB_header_value, &p_state, parsed, p - data + 1, &header_value_mark, p - header_value_mark); if (rc != 0) { return rc; } break; } if (ch == LF) { UPDATE_STATE(s_header_almost_done); rc = count_header_size(parser, p - start); if (rc != 0) { goto error; } parser->header_state = h_state; rc = cb_data(parser, settings->on_header_value, HPE_CB_header_value, &p_state, parsed, p - data, &header_value_mark, p - header_value_mark); if (rc != 0) { return rc; } goto reexecute; } if (!lenient && !IS_HEADER_CHAR(ch)) { SET_ERRNO(HPE_INVALID_HEADER_TOKEN); goto error; } c = LOWER(ch); rc = header_states(parser, data, len, &p, &p_state, &h_state, ch, c); if (rc != 0) { goto error; } } parser->header_state = h_state; rc = count_header_size(parser, p - start); if (rc != 0) { goto error; } if (p == data + len) { --p; } break; } case s_header_almost_done: { if (UNLIKELY(ch != LF)) { SET_ERRNO(HPE_LF_EXPECTED); goto error; } UPDATE_STATE(s_header_value_lws); break; } case s_header_value_lws: { if (ch == ' ' || ch == '\t') { UPDATE_STATE(s_header_value_start); goto reexecute; } /* finished the header */ switch (parser->header_state) { case h_connection_keep_alive: parser->flags |= F_CONNECTION_KEEP_ALIVE; break; case h_connection_close: parser->flags |= F_CONNECTION_CLOSE; break; case h_transfer_encoding_chunked: parser->flags |= F_CHUNKED; break; case h_connection_upgrade: parser->flags |= F_CONNECTION_UPGRADE; break; default: break; } UPDATE_STATE(s_header_field_start); goto reexecute; } case s_header_value_discard_ws_almost_done: { rc = strict_check(parser, ch != LF); if (rc != 0) { goto error; } UPDATE_STATE(s_header_value_discard_lws); break; } case s_header_value_discard_lws: { if (ch == ' ' || ch == '\t') { UPDATE_STATE(s_header_value_discard_ws); break; } switch (parser->header_state) { case h_connection_keep_alive: parser->flags |= F_CONNECTION_KEEP_ALIVE; break; case h_connection_close: parser->flags |= F_CONNECTION_CLOSE; break; case h_connection_upgrade: parser->flags |= F_CONNECTION_UPGRADE; break; case h_transfer_encoding_chunked: parser->flags |= F_CHUNKED; break; default: break; } /* header value was empty */ MARK(header_value); UPDATE_STATE(s_header_field_start); rc = cb_data(parser, settings->on_header_value, HPE_CB_header_value, &p_state, parsed, p - data, &header_value_mark, p - header_value_mark); if (rc != 0) { return rc; } goto reexecute; } case s_headers_almost_done: { rc = strict_check(parser, ch != LF); if (rc != 0) { goto error; } if (parser->flags & F_TRAILING) { /* End of a chunked request */ UPDATE_STATE(s_message_done); rc = cb_notify(parser, &p_state, settings->on_chunk_complete, HPE_CB_chunk_complete, parsed, p - data); if (rc != 0) { return rc; } goto reexecute; } /* Cannot use chunked encoding and a content-length * header together per the HTTP specification. */ if ((parser->flags & F_CHUNKED) && (parser->flags & F_CONTENTLENGTH)) { SET_ERRNO(HPE_UNEXPECTED_CONTENT_LENGTH); goto error; } UPDATE_STATE(s_headers_done); /* Set this here so that on_headers_complete() callbacks * can see it */ int flags = (F_UPGRADE | F_CONNECTION_UPGRADE); parser->upgrade = ((parser->flags & flags) == flags || parser->method == HTTP_CONNECT); /* Here we call the headers_complete callback. This is * somewhat * different than other callbacks because if the user * returns 1, we * will interpret that as saying that this message has * no body. This * is needed for the annoying case of receiving a * response to a HEAD * request. * * We'd like to use CALLBACK_NOTIFY_NOADVANCE() here but * we cannot, so * we have to simulate it by handling a change in errno * below. */ if (settings->on_headers_complete) { switch (settings->on_headers_complete(parser)) { case 0: break; case 2: parser->upgrade = 1U; __fallthrough; case 1: parser->flags |= F_SKIPBODY; break; default: SET_ERRNO(HPE_CB_headers_complete); parser->state = CURRENT_STATE(); *parsed = p - data; return -HTTP_PARSER_ERRNO(parser); } } if (HTTP_PARSER_ERRNO(parser) != HPE_OK) { parser->state = CURRENT_STATE(); *parsed = p - data; return -HTTP_PARSER_ERRNO(parser); } goto reexecute; } case s_headers_done: { int hasBody; rc = strict_check(parser, ch != LF); if (rc != 0) { goto error; } parser->nread = 0U; hasBody = parser->flags & F_CHUNKED || (parser->content_length > 0 && parser->content_length != ULLONG_MAX); if (parser->upgrade && (parser->method == HTTP_CONNECT || (parser->flags & F_SKIPBODY) || !hasBody)) { /* Exit, the rest of the message is in a * different protocol. */ UPDATE_STATE(NEW_MESSAGE()); rc = cb_notify(parser, &p_state, settings->on_message_complete, HPE_CB_message_complete, parsed, p - data + 1); if (rc != 0) { return rc; } parser->state = CURRENT_STATE(); *parsed = p - data + 1; return 0; } if (parser->flags & F_SKIPBODY) { UPDATE_STATE(NEW_MESSAGE()); rc = cb_notify(parser, &p_state, settings->on_message_complete, HPE_CB_message_complete, parsed, p - data + 1); if (rc != 0) { return rc; } } else if (parser->flags & F_CHUNKED) { /* chunked encoding - ignore Content-Length * header */ UPDATE_STATE(s_chunk_size_start); } else { rc = zero_content_length(parser, settings, &p_state, parsed, p, data); if (rc != 0) { return rc; } } break; } case s_body_identity: { uint64_t to_read = MIN(parser->content_length, (uint64_t) ((data + len) - p)); __ASSERT_NO_MSG(parser->content_length != 0U && parser->content_length != ULLONG_MAX); /* The difference between advancing content_length and * p is because * the latter will automatically advance on the next * loop * iteration. * Further, if content_length ends up at 0, we want to * see the last * byte again for our message complete callback. */ MARK(body); parser->content_length -= to_read; p += to_read - 1; if (parser->content_length == 0U) { UPDATE_STATE(s_message_done); /* Mimic CALLBACK_DATA_NOADVANCE() but with one * extra byte. * * The alternative to doing this is to wait for * the next byte to * trigger the data callback, just as in every * other case. The * problem with this is that this makes it * difficult for the test * harness to distinguish between * complete-on-EOF and * complete-on-length. It's not clear that this * distinction is * important for applications, but let's keep it * for now. */ rc = cb_data(parser, settings->on_body, HPE_CB_body, &p_state, parsed, p - data, &body_mark, p - body_mark + 1); if (rc != 0) { return rc; } goto reexecute; } break; } /* read until EOF */ case s_body_identity_eof: MARK(body); p = data + len - 1; break; case s_message_done: UPDATE_STATE(NEW_MESSAGE()); rc = cb_notify(parser, &p_state, settings->on_message_complete, HPE_CB_message_complete, parsed, p - data + 1); if (rc != 0) { return rc; } if (parser->upgrade) { /* Exit, the rest of the message is in a * different protocol. */ parser->state = CURRENT_STATE(); *parsed = p - data + 1; return 0; } break; case s_chunk_size_start: { __ASSERT_NO_MSG(parser->nread == 1U); __ASSERT_NO_MSG(parser->flags & F_CHUNKED); unhex_val = unhex[(unsigned char)ch]; if (UNLIKELY(unhex_val == -1)) { SET_ERRNO(HPE_INVALID_CHUNK_SIZE); goto error; } parser->content_length = unhex_val; UPDATE_STATE(s_chunk_size); break; } case s_chunk_size: { uint64_t t; __ASSERT_NO_MSG(parser->flags & F_CHUNKED); if (ch == CR) { UPDATE_STATE(s_chunk_size_almost_done); break; } unhex_val = unhex[(unsigned char)ch]; if (unhex_val == -1) { if (ch == ';' || ch == ' ') { UPDATE_STATE(s_chunk_parameters); break; } SET_ERRNO(HPE_INVALID_CHUNK_SIZE); goto error; } t = parser->content_length; t *= 16U; t += unhex_val; /* Overflow? Test against a conservative limit for * simplicity. */ uint64_t ulong_value = (ULLONG_MAX - 16) / 16; if (UNLIKELY(ulong_value < parser->content_length)) { SET_ERRNO(HPE_INVALID_CONTENT_LENGTH); goto error; } parser->content_length = t; break; } case s_chunk_parameters: { __ASSERT_NO_MSG(parser->flags & F_CHUNKED); /* just ignore this shit. TODO check for overflow */ if (ch == CR) { UPDATE_STATE(s_chunk_size_almost_done); break; } break; } case s_chunk_size_almost_done: { __ASSERT_NO_MSG(parser->flags & F_CHUNKED); rc = strict_check(parser, ch != LF); if (rc != 0) { goto error; } parser->nread = 0U; if (parser->content_length == 0U) { parser->flags |= F_TRAILING; UPDATE_STATE(s_header_field_start); } else { UPDATE_STATE(s_chunk_data); } rc = cb_notify(parser, &p_state, settings->on_chunk_header, HPE_CB_chunk_header, parsed, p - data + 1); if (rc != 0) { return rc; } break; } case s_chunk_data: { uint64_t to_read = MIN(parser->content_length, (uint64_t) ((data + len) - p)); __ASSERT_NO_MSG(parser->flags & F_CHUNKED); __ASSERT_NO_MSG(parser->content_length != 0U && parser->content_length != ULLONG_MAX); /* See the explanation in s_body_identity for why the * content * length and data pointers are managed this way. */ MARK(body); parser->content_length -= to_read; p += to_read - 1; if (parser->content_length == 0U) { UPDATE_STATE(s_chunk_data_almost_done); } break; } case s_chunk_data_almost_done: __ASSERT_NO_MSG(parser->flags & F_CHUNKED); __ASSERT_NO_MSG(parser->content_length == 0U); rc = strict_check(parser, ch != CR); if (rc != 0) { goto error; } UPDATE_STATE(s_chunk_data_done); rc = cb_data(parser, settings->on_body, HPE_CB_body, &p_state, parsed, p - data + 1, &body_mark, p - body_mark); if (rc != 0) { return rc; } break; case s_chunk_data_done: __ASSERT_NO_MSG(parser->flags & F_CHUNKED); rc = strict_check(parser, ch != LF); if (rc != 0) { goto error; } parser->nread = 0U; UPDATE_STATE(s_chunk_size_start); rc = cb_notify(parser, &p_state, settings->on_chunk_complete, HPE_CB_chunk_complete, parsed, p - data + 1); if (rc != 0) { return rc; } break; default: __ASSERT_NO_MSG(0 && "unhandled state"); SET_ERRNO(HPE_INVALID_INTERNAL_STATE); goto error; } } /* Run callbacks for any marks that we have leftover after we ran our of * bytes. There should be at most one of these set, so it's OK to invoke * them in series (unset marks will not result in callbacks). * * We use the NOADVANCE() variety of callbacks here because 'p' has * already * overflowed 'data' and this allows us to correct for the off-by-one * that * we'd otherwise have (since CALLBACK_DATA() is meant to be run with a * 'p' * value that's in-bounds). */ __ASSERT_NO_MSG(((header_field_mark ? 1 : 0) + (header_value_mark ? 1 : 0) + (url_mark ? 1 : 0) + (body_mark ? 1 : 0) + (status_mark ? 1 : 0)) <= 1); rc = cb_data(parser, settings->on_header_field, HPE_CB_header_field, &p_state, parsed, p - data, &header_field_mark, p - header_field_mark); if (rc != 0) { return rc; } rc = cb_data(parser, settings->on_header_value, HPE_CB_header_value, &p_state, parsed, p - data, &header_value_mark, p - header_value_mark); if (rc != 0) { return rc; } rc = cb_data(parser, settings->on_url, HPE_CB_url, &p_state, parsed, p - data, &url_mark, p - url_mark); if (rc != 0) { return rc; } rc = cb_data(parser, settings->on_body, HPE_CB_body, &p_state, parsed, p - data, &body_mark, p - body_mark); if (rc != 0) { return rc; } rc = cb_data(parser, settings->on_status, HPE_CB_status, &p_state, parsed, p - data, &status_mark, p - status_mark); if (rc != 0) { return rc; } parser->state = CURRENT_STATE(); *parsed = len; return 0; error: if (HTTP_PARSER_ERRNO(parser) == HPE_OK) { SET_ERRNO(HPE_UNKNOWN); } parser->state = CURRENT_STATE(); *parsed = p - data; /* Error */ return -HTTP_PARSER_ERRNO(parser); } size_t http_parser_execute(struct http_parser *parser, const struct http_parser_settings *settings, const char *data, size_t len) { size_t parsed; parser_execute(parser, settings, data, len, &parsed); return parsed; } /* Does the parser need to see an EOF to find the end of the message? */ int http_message_needs_eof(const struct http_parser *parser) { if (parser->type == HTTP_REQUEST) { return 0; } /* See RFC 2616 section 4.4 */ if (parser->status_code / 100 == 1U || /* 1xx e.g. Continue */ parser->status_code == 204U || /* No Content */ parser->status_code == 304U || /* Not Modified */ parser->flags & F_SKIPBODY) { /* response to a HEAD * request */ return 0; } if ((parser->flags & F_CHUNKED) || parser->content_length != ULLONG_MAX) { return 0; } return 1; } int http_should_keep_alive(const struct http_parser *parser) { if (parser->http_major > 0 && parser->http_minor > 0) { /* HTTP/1.1 */ if (parser->flags & F_CONNECTION_CLOSE) { return 0; } } else { /* HTTP/1.0 or earlier */ if (!(parser->flags & F_CONNECTION_KEEP_ALIVE)) { return 0; } } return !http_message_needs_eof(parser); } const char *http_method_str(enum http_method m) { return ELEM_AT(method_strings, m, ""); } void http_parser_init(struct http_parser *parser, enum http_parser_type t) { void *data = parser->data; /* preserve application data */ (void)memset(parser, 0, sizeof(*parser)); parser->data = data; parser->type = t; parser->state = (t == HTTP_REQUEST ? s_start_req : (t == HTTP_RESPONSE ? s_start_res : s_start_req_or_res)); parser->http_errno = HPE_OK; } void http_parser_settings_init(struct http_parser_settings *settings) { (void)memset(settings, 0, sizeof(*settings)); } const char *http_errno_name(enum http_errno err) { __ASSERT_NO_MSG(((size_t) err) < ARRAY_SIZE(http_strerror_tab)); return http_strerror_tab[err].name; } const char *http_errno_description(enum http_errno err) { __ASSERT_NO_MSG(((size_t) err) < ARRAY_SIZE(http_strerror_tab)); return http_strerror_tab[err].description; } void http_parser_pause(struct http_parser *parser, int paused) { /* Users should only be pausing/unpausing a parser that is not in an * error * state. In non-debug builds, there's not much that we can do about * this * other than ignore it. */ if (HTTP_PARSER_ERRNO(parser) == HPE_OK || HTTP_PARSER_ERRNO(parser) == HPE_PAUSED) { SET_ERRNO((paused) ? HPE_PAUSED : HPE_OK); } else { __ASSERT_NO_MSG(0 && "Attempting to pause parser in error state"); } } int http_body_is_final(const struct http_parser *parser) { return parser->state == s_message_done; } unsigned long http_parser_version(void) { return HTTP_PARSER_VERSION_MAJOR * 0x10000 | HTTP_PARSER_VERSION_MINOR * 0x00100 | HTTP_PARSER_VERSION_PATCH * 0x00001; }