http_parser.c 59.9 KB
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/* 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.
 */
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#include "http_parser.h"
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#include <assert.h>
#include <stddef.h>
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#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
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#ifndef ULLONG_MAX
# define ULLONG_MAX ((uint64_t) -1) /* 2^64-1 */
#endif
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#ifndef MIN
# define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif

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#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
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#define SET_ERRNO(e)                                                 \
do {                                                                 \
  parser->http_errno = (e);                                          \
} while(0)


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/* Run the notify callback FOR, returning ER if it fails */
#define CALLBACK_NOTIFY_(FOR, ER)                                    \
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do {                                                                 \
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  assert(HTTP_PARSER_ERRNO(parser) == HPE_OK);                       \
                                                                     \
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  if (settings->on_##FOR) {                                          \
    if (0 != settings->on_##FOR(parser)) {                           \
      SET_ERRNO(HPE_CB_##FOR);                                       \
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    }                                                                \
                                                                     \
    /* We either errored above or got paused; get out */             \
    if (HTTP_PARSER_ERRNO(parser) != HPE_OK) {                       \
      return (ER);                                                   \
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    }                                                                \
  }                                                                  \
} while (0)

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/* Run the notify callback FOR and consume the current byte */
#define CALLBACK_NOTIFY(FOR)            CALLBACK_NOTIFY_(FOR, p - data + 1)
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/* Run the notify callback FOR and don't consume the current byte */
#define CALLBACK_NOTIFY_NOADVANCE(FOR)  CALLBACK_NOTIFY_(FOR, p - data)
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/* Run data callback FOR with LEN bytes, returning ER if it fails */
#define CALLBACK_DATA_(FOR, LEN, ER)                                 \
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do {                                                                 \
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  assert(HTTP_PARSER_ERRNO(parser) == HPE_OK);                       \
                                                                     \
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  if (FOR##_mark) {                                                  \
    if (settings->on_##FOR) {                                        \
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      if (0 != settings->on_##FOR(parser, FOR##_mark, (LEN))) {      \
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        SET_ERRNO(HPE_CB_##FOR);                                     \
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      }                                                              \
                                                                     \
      /* We either errored above or got paused; get out */           \
      if (HTTP_PARSER_ERRNO(parser) != HPE_OK) {                     \
        return (ER);                                                 \
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      }                                                              \
    }                                                                \
    FOR##_mark = NULL;                                               \
  }                                                                  \
} while (0)
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/* 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)
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#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[] =
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  {
#define XX(num, name, string) #string,
  HTTP_METHOD_MAP(XX)
#undef XX
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  };


/* 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  '  */
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        0,      '!',      0,      '#',     '$',     '%',     '&',    '\'',
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/*  40  (    41  )    42  *    43  +    44  ,    45  -    46  .    47  /  */
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        0,       0,      '*',     '+',      0,      '-',     '.',      0,
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/*  48  0    49  1    50  2    51  3    52  4    53  5    54  6    55  7  */
       '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 */
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       'x',     'y',     'z',      0,      '|',      0,      '~',       0 };
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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
  };


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#if HTTP_PARSER_STRICT
# define T(v) 0
#else
# define T(v) v
#endif


static const uint8_t normal_url_char[32] = {
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/*   0 nul    1 soh    2 stx    3 etx    4 eot    5 enq    6 ack    7 bel  */
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        0    |   0    |   0    |   0    |   0    |   0    |   0    |   0,
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/*   8 bs     9 ht    10 nl    11 vt    12 np    13 cr    14 so    15 si   */
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        0    | T(2)   |   0    |   0    | T(16)  |   0    |   0    |   0,
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/*  16 dle   17 dc1   18 dc2   19 dc3   20 dc4   21 nak   22 syn   23 etb */
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        0    |   0    |   0    |   0    |   0    |   0    |   0    |   0,
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/*  24 can   25 em    26 sub   27 esc   28 fs    29 gs    30 rs    31 us  */
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        0    |   0    |   0    |   0    |   0    |   0    |   0    |   0,
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/*  32 sp    33  !    34  "    35  #    36  $    37  %    38  &    39  '  */
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        0    |   2    |   4    |   0    |   16   |   32   |   64   |  128,
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/*  40  (    41  )    42  *    43  +    44  ,    45  -    46  .    47  /  */
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        1    |   2    |   4    |   8    |   16   |   32   |   64   |  128,
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/*  48  0    49  1    50  2    51  3    52  4    53  5    54  6    55  7  */
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        1    |   2    |   4    |   8    |   16   |   32   |   64   |  128,
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/*  56  8    57  9    58  :    59  ;    60  <    61  =    62  >    63  ?  */
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        1    |   2    |   4    |   8    |   16   |   32   |   64   |   0,
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/*  64  @    65  A    66  B    67  C    68  D    69  E    70  F    71  G  */
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        1    |   2    |   4    |   8    |   16   |   32   |   64   |  128,
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/*  72  H    73  I    74  J    75  K    76  L    77  M    78  N    79  O  */
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        1    |   2    |   4    |   8    |   16   |   32   |   64   |  128,
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/*  80  P    81  Q    82  R    83  S    84  T    85  U    86  V    87  W  */
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        1    |   2    |   4    |   8    |   16   |   32   |   64   |  128,
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/*  88  X    89  Y    90  Z    91  [    92  \    93  ]    94  ^    95  _  */
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        1    |   2    |   4    |   8    |   16   |   32   |   64   |  128,
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/*  96  `    97  a    98  b    99  c   100  d   101  e   102  f   103  g  */
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        1    |   2    |   4    |   8    |   16   |   32   |   64   |  128,
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/* 104  h   105  i   106  j   107  k   108  l   109  m   110  n   111  o  */
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        1    |   2    |   4    |   8    |   16   |   32   |   64   |  128,
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/* 112  p   113  q   114  r   115  s   116  t   117  u   118  v   119  w  */
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        1    |   2    |   4    |   8    |   16   |   32   |   64   |  128,
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/* 120  x   121  y   122  z   123  {   124  |   125  }   126  ~   127 del */
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        1    |   2    |   4    |   8    |   16   |   32   |   64   |   0, };
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#undef T
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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
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  , s_req_server_start
  , s_req_server
  , s_req_server_with_at
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  , 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
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  , s_headers_almost_done
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  , s_headers_done

  /* Important: 's_headers_done' must be the last 'header' state. All
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   * states beyond this must be 'body' states. It is used for overflow
   * 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
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  , s_message_done
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  };


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#define PARSING_HEADER(state) (state <= s_headers_done)
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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
  };

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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
};
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/* 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))
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#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) == ',')
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#if HTTP_PARSER_STRICT
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#define TOKEN(c)            (tokens[(unsigned char)c])
#define IS_URL_CHAR(c)      (BIT_AT(normal_url_char, (unsigned char)c))
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#define IS_HOST_CHAR(c)     (IS_ALPHANUM(c) || (c) == '.' || (c) == '-')
#else
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#define TOKEN(c)            ((c == ' ') ? ' ' : tokens[(unsigned char)c])
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#define IS_URL_CHAR(c)                                                         \
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  (BIT_AT(normal_url_char, (unsigned char)c) || ((c) & 0x80))
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#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

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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;
      }

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      /* The schema must start with an alpha character. After that, it may
       * consist of digits, '+', '-' or '.', followed by a ':'.
       */
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      if (IS_ALPHA(ch)) {
        return s_req_schema;
      }

      break;

    case s_req_schema:
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      if (IS_ALPHANUM(ch) || ch == '+' || ch == '-' || ch == '.') {
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        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;
}
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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;
582 583 584 585 586
  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;
587 588 589 590 591 592 593

  /* We're in an error state. Don't bother doing anything. */
  if (HTTP_PARSER_ERRNO(parser) != HPE_OK) {
    return 0;
  }

  if (len == 0) {
594
    switch (parser->state) {
595
      case s_body_identity_eof:
596 597 598 599
        /* Use of CALLBACK_NOTIFY() here would erroneously return 1 byte read if
         * we got paused.
         */
        CALLBACK_NOTIFY_NOADVANCE(message_complete);
600 601 602 603 604 605 606 607 608 609 610 611 612 613 614
        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;
    }
  }


615
  if (parser->state == s_header_field)
616
    header_field_mark = data;
617
  if (parser->state == s_header_value)
618
    header_value_mark = data;
619 620 621 622 623 624 625 626 627 628 629 630
  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:
631
    url_mark = data;
632 633
    break;
  }
634

635
  for (p=data; p != data + len; p++) {
636 637
    ch = *p;

638 639
    if (PARSING_HEADER(parser->state)) {
      ++parser->nread;
640
      /* Buffer overflow attack */
641
      if (parser->nread > HTTP_MAX_HEADER_SIZE) {
642 643 644 645 646
        SET_ERRNO(HPE_HEADER_OVERFLOW);
        goto error;
      }
    }

647 648
    reexecute_byte:
    switch (parser->state) {
649 650 651 652 653

      case s_dead:
        /* this state is used after a 'Connection: close' message
         * the parser will error out if it reads another message
         */
654 655 656
        if (ch == CR || ch == LF)
          break;

657 658 659 660 661 662 663 664
        SET_ERRNO(HPE_CLOSED_CONNECTION);
        goto error;

      case s_start_req_or_res:
      {
        if (ch == CR || ch == LF)
          break;
        parser->flags = 0;
665
        parser->content_length = ULLONG_MAX;
666

667 668
        if (ch == 'H') {
          parser->state = s_res_or_resp_H;
669

670 671
          CALLBACK_NOTIFY(message_begin);
        } else {
672
          parser->type = HTTP_REQUEST;
673 674
          parser->state = s_start_req;
          goto reexecute_byte;
675
        }
676

677 678 679 680 681 682
        break;
      }

      case s_res_or_resp_H:
        if (ch == 'T') {
          parser->type = HTTP_RESPONSE;
683
          parser->state = s_res_HT;
684 685 686 687 688 689 690 691
        } else {
          if (ch != 'E') {
            SET_ERRNO(HPE_INVALID_CONSTANT);
            goto error;
          }

          parser->type = HTTP_REQUEST;
          parser->method = HTTP_HEAD;
692 693
          parser->index = 2;
          parser->state = s_req_method;
694 695 696 697 698 699
        }
        break;

      case s_start_res:
      {
        parser->flags = 0;
700
        parser->content_length = ULLONG_MAX;
701 702 703

        switch (ch) {
          case 'H':
704
            parser->state = s_res_H;
705 706 707 708 709 710 711 712 713 714
            break;

          case CR:
          case LF:
            break;

          default:
            SET_ERRNO(HPE_INVALID_CONSTANT);
            goto error;
        }
715 716

        CALLBACK_NOTIFY(message_begin);
717 718 719 720 721
        break;
      }

      case s_res_H:
        STRICT_CHECK(ch != 'T');
722
        parser->state = s_res_HT;
723 724 725 726
        break;

      case s_res_HT:
        STRICT_CHECK(ch != 'T');
727
        parser->state = s_res_HTT;
728 729 730 731
        break;

      case s_res_HTT:
        STRICT_CHECK(ch != 'P');
732
        parser->state = s_res_HTTP;
733 734 735 736
        break;

      case s_res_HTTP:
        STRICT_CHECK(ch != '/');
737
        parser->state = s_res_first_http_major;
738 739 740
        break;

      case s_res_first_http_major:
741
        if (ch < '0' || ch > '9') {
742 743 744 745 746
          SET_ERRNO(HPE_INVALID_VERSION);
          goto error;
        }

        parser->http_major = ch - '0';
747
        parser->state = s_res_http_major;
748 749 750 751 752 753
        break;

      /* major HTTP version or dot */
      case s_res_http_major:
      {
        if (ch == '.') {
754
          parser->state = s_res_first_http_minor;
755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781
          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';
782
        parser->state = s_res_http_minor;
783 784 785 786 787 788
        break;

      /* minor HTTP version or end of request line */
      case s_res_http_minor:
      {
        if (ch == ' ') {
789
          parser->state = s_res_first_status_code;
790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819
          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';
820
        parser->state = s_res_status_code;
821 822 823 824 825 826 827 828
        break;
      }

      case s_res_status_code:
      {
        if (!IS_NUM(ch)) {
          switch (ch) {
            case ' ':
829
              parser->state = s_res_status;
830 831
              break;
            case CR:
832
              parser->state = s_res_line_almost_done;
833 834
              break;
            case LF:
835
              parser->state = s_header_field_start;
836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858
              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) {
859
          parser->state = s_res_line_almost_done;
860 861 862 863
          break;
        }

        if (ch == LF) {
864
          parser->state = s_header_field_start;
865 866 867 868 869 870
          break;
        }
        break;

      case s_res_line_almost_done:
        STRICT_CHECK(ch != LF);
871
        parser->state = s_header_field_start;
872 873 874 875 876 877 878
        break;

      case s_start_req:
      {
        if (ch == CR || ch == LF)
          break;
        parser->flags = 0;
879
        parser->content_length = ULLONG_MAX;
880 881 882 883 884 885 886

        if (!IS_ALPHA(ch)) {
          SET_ERRNO(HPE_INVALID_METHOD);
          goto error;
        }

        parser->method = (enum http_method) 0;
887
        parser->index = 1;
888 889 890 891 892 893 894 895 896 897
        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;
898
            /* or PROPFIND|PROPPATCH|PUT|PATCH|PURGE */
899 900
            break;
          case 'R': parser->method = HTTP_REPORT; break;
901
          case 'S': parser->method = HTTP_SUBSCRIBE; /* or SEARCH */ break;
902 903 904 905 906 907
          case 'T': parser->method = HTTP_TRACE; break;
          case 'U': parser->method = HTTP_UNLOCK; /* or UNSUBSCRIBE */ break;
          default:
            SET_ERRNO(HPE_INVALID_METHOD);
            goto error;
        }
908 909 910 911
        parser->state = s_req_method;

        CALLBACK_NOTIFY(message_begin);

912 913 914 915 916
        break;
      }

      case s_req_method:
      {
917
        const char *matcher;
918 919 920 921 922
        if (ch == '\0') {
          SET_ERRNO(HPE_INVALID_METHOD);
          goto error;
        }

923
        matcher = method_strings[parser->method];
924 925 926
        if (ch == ' ' && matcher[parser->index] == '\0') {
          parser->state = s_req_spaces_before_url;
        } else if (ch == matcher[parser->index]) {
927 928
          ; /* nada */
        } else if (parser->method == HTTP_CONNECT) {
929
          if (parser->index == 1 && ch == 'H') {
930
            parser->method = HTTP_CHECKOUT;
931
          } else if (parser->index == 2  && ch == 'P') {
932 933 934 935 936
            parser->method = HTTP_COPY;
          } else {
            goto error;
          }
        } else if (parser->method == HTTP_MKCOL) {
937
          if (parser->index == 1 && ch == 'O') {
938
            parser->method = HTTP_MOVE;
939
          } else if (parser->index == 1 && ch == 'E') {
940
            parser->method = HTTP_MERGE;
941
          } else if (parser->index == 1 && ch == '-') {
942
            parser->method = HTTP_MSEARCH;
943
          } else if (parser->index == 2 && ch == 'A') {
944 945 946 947
            parser->method = HTTP_MKACTIVITY;
          } else {
            goto error;
          }
948 949 950 951 952 953 954
        } 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) {
955 956 957
          if (ch == 'R') {
            parser->method = HTTP_PROPFIND; /* or HTTP_PROPPATCH */
          } else if (ch == 'U') {
958
            parser->method = HTTP_PUT; /* or HTTP_PURGE */
959 960 961 962 963
          } else if (ch == 'A') {
            parser->method = HTTP_PATCH;
          } else {
            goto error;
          }
964 965 966 967 968 969 970
        } 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') {
971 972 973 974 975 976
          parser->method = HTTP_PROPPATCH;
        } else {
          SET_ERRNO(HPE_INVALID_METHOD);
          goto error;
        }

977
        ++parser->index;
978 979
        break;
      }
980

981 982 983 984
      case s_req_spaces_before_url:
      {
        if (ch == ' ') break;

985 986 987
        MARK(url);
        if (parser->method == HTTP_CONNECT) {
          parser->state = s_req_server_start;
988 989
        }

990 991 992 993
        parser->state = parse_url_char((enum state)parser->state, ch);
        if (parser->state == s_dead) {
          SET_ERRNO(HPE_INVALID_URL);
          goto error;
994 995
        }

996
        break;
997 998 999 1000 1001
      }

      case s_req_schema:
      case s_req_schema_slash:
      case s_req_schema_slash_slash:
1002
      case s_req_server_start:
1003 1004
      {
        switch (ch) {
1005
          /* No whitespace allowed here */
1006 1007 1008
          case ' ':
          case CR:
          case LF:
1009
            SET_ERRNO(HPE_INVALID_URL);
1010 1011
            goto error;
          default:
1012 1013 1014 1015 1016
            parser->state = parse_url_char((enum state)parser->state, ch);
            if (parser->state == s_dead) {
              SET_ERRNO(HPE_INVALID_URL);
              goto error;
            }
1017 1018 1019 1020 1021
        }

        break;
      }

1022 1023 1024 1025 1026
      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:
1027 1028 1029 1030 1031
      case s_req_fragment_start:
      case s_req_fragment:
      {
        switch (ch) {
          case ' ':
1032 1033
            parser->state = s_req_http_start;
            CALLBACK_DATA(url);
1034 1035 1036 1037 1038
            break;
          case CR:
          case LF:
            parser->http_major = 0;
            parser->http_minor = 9;
1039 1040 1041 1042
            parser->state = (ch == CR) ?
              s_req_line_almost_done :
              s_header_field_start;
            CALLBACK_DATA(url);
1043 1044
            break;
          default:
1045 1046 1047 1048 1049
            parser->state = parse_url_char((enum state)parser->state, ch);
            if (parser->state == s_dead) {
              SET_ERRNO(HPE_INVALID_URL);
              goto error;
            }
1050 1051 1052 1053 1054 1055 1056
        }
        break;
      }

      case s_req_http_start:
        switch (ch) {
          case 'H':
1057
            parser->state = s_req_http_H;
1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
            break;
          case ' ':
            break;
          default:
            SET_ERRNO(HPE_INVALID_CONSTANT);
            goto error;
        }
        break;

      case s_req_http_H:
        STRICT_CHECK(ch != 'T');
1069
        parser->state = s_req_http_HT;
1070 1071 1072 1073
        break;

      case s_req_http_HT:
        STRICT_CHECK(ch != 'T');
1074
        parser->state = s_req_http_HTT;
1075 1076 1077 1078
        break;

      case s_req_http_HTT:
        STRICT_CHECK(ch != 'P');
1079
        parser->state = s_req_http_HTTP;
1080 1081 1082 1083
        break;

      case s_req_http_HTTP:
        STRICT_CHECK(ch != '/');
1084
        parser->state = s_req_first_http_major;
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
        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';
1095
        parser->state = s_req_http_major;
1096 1097 1098 1099 1100 1101
        break;

      /* major HTTP version or dot */
      case s_req_http_major:
      {
        if (ch == '.') {
1102
          parser->state = s_req_first_http_minor;
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
          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';
1130
        parser->state = s_req_http_minor;
1131 1132 1133 1134 1135 1136
        break;

      /* minor HTTP version or end of request line */
      case s_req_http_minor:
      {
        if (ch == CR) {
1137
          parser->state = s_req_line_almost_done;
1138 1139 1140 1141
          break;
        }

        if (ch == LF) {
1142
          parser->state = s_header_field_start;
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171
          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;
        }

1172
        parser->state = s_header_field_start;
1173 1174 1175 1176 1177 1178
        break;
      }

      case s_header_field_start:
      {
        if (ch == CR) {
1179
          parser->state = s_headers_almost_done;
1180 1181 1182 1183 1184 1185
          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*/
1186 1187
          parser->state = s_headers_almost_done;
          goto reexecute_byte;
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198
        }

        c = TOKEN(ch);

        if (!c) {
          SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
          goto error;
        }

        MARK(header_field);

1199 1200
        parser->index = 0;
        parser->state = s_header_field;
1201 1202 1203

        switch (c) {
          case 'c':
1204
            parser->header_state = h_C;
1205 1206 1207
            break;

          case 'p':
1208
            parser->header_state = h_matching_proxy_connection;
1209 1210 1211
            break;

          case 't':
1212
            parser->header_state = h_matching_transfer_encoding;
1213 1214 1215
            break;

          case 'u':
1216
            parser->header_state = h_matching_upgrade;
1217 1218 1219
            break;

          default:
1220
            parser->header_state = h_general;
1221 1222 1223 1224 1225 1226 1227 1228 1229 1230
            break;
        }
        break;
      }

      case s_header_field:
      {
        c = TOKEN(ch);

        if (c) {
1231
          switch (parser->header_state) {
1232 1233 1234 1235
            case h_general:
              break;

            case h_C:
1236 1237
              parser->index++;
              parser->header_state = (c == 'o' ? h_CO : h_general);
1238 1239 1240
              break;

            case h_CO:
1241 1242
              parser->index++;
              parser->header_state = (c == 'n' ? h_CON : h_general);
1243 1244 1245
              break;

            case h_CON:
1246
              parser->index++;
1247 1248
              switch (c) {
                case 'n':
1249
                  parser->header_state = h_matching_connection;
1250 1251
                  break;
                case 't':
1252
                  parser->header_state = h_matching_content_length;
1253 1254
                  break;
                default:
1255
                  parser->header_state = h_general;
1256 1257 1258 1259 1260 1261 1262
                  break;
              }
              break;

            /* connection */

            case h_matching_connection:
1263 1264 1265 1266 1267 1268
              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;
1269 1270 1271 1272 1273 1274
              }
              break;

            /* proxy-connection */

            case h_matching_proxy_connection:
1275 1276 1277 1278 1279 1280
              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;
1281 1282 1283 1284 1285 1286
              }
              break;

            /* content-length */

            case h_matching_content_length:
1287 1288 1289 1290 1291 1292
              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;
1293 1294 1295 1296 1297 1298
              }
              break;

            /* transfer-encoding */

            case h_matching_transfer_encoding:
1299 1300 1301 1302 1303 1304
              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;
1305 1306 1307 1308 1309 1310
              }
              break;

            /* upgrade */

            case h_matching_upgrade:
1311 1312 1313 1314 1315 1316
              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;
1317 1318 1319 1320 1321 1322 1323
              }
              break;

            case h_connection:
            case h_content_length:
            case h_transfer_encoding:
            case h_upgrade:
1324
              if (ch != ' ') parser->header_state = h_general;
1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
              break;

            default:
              assert(0 && "Unknown header_state");
              break;
          }
          break;
        }

        if (ch == ':') {
1335 1336
          parser->state = s_header_value_start;
          CALLBACK_DATA(header_field);
1337 1338 1339 1340
          break;
        }

        if (ch == CR) {
1341 1342
          parser->state = s_header_almost_done;
          CALLBACK_DATA(header_field);
1343 1344 1345 1346
          break;
        }

        if (ch == LF) {
1347 1348
          parser->state = s_header_field_start;
          CALLBACK_DATA(header_field);
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
          break;
        }

        SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
        goto error;
      }

      case s_header_value_start:
      {
        if (ch == ' ' || ch == '\t') break;

        MARK(header_value);

1362 1363
        parser->state = s_header_value;
        parser->index = 0;
1364 1365

        if (ch == CR) {
1366 1367 1368
          parser->header_state = h_general;
          parser->state = s_header_almost_done;
          CALLBACK_DATA(header_value);
1369 1370 1371 1372
          break;
        }

        if (ch == LF) {
1373 1374
          parser->state = s_header_field_start;
          CALLBACK_DATA(header_value);
1375 1376 1377 1378 1379
          break;
        }

        c = LOWER(ch);

1380
        switch (parser->header_state) {
1381 1382
          case h_upgrade:
            parser->flags |= F_UPGRADE;
1383
            parser->header_state = h_general;
1384 1385 1386 1387 1388
            break;

          case h_transfer_encoding:
            /* looking for 'Transfer-Encoding: chunked' */
            if ('c' == c) {
1389
              parser->header_state = h_matching_transfer_encoding_chunked;
1390
            } else {
1391
              parser->header_state = h_general;
1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406
            }
            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') {
1407
              parser->header_state = h_matching_connection_keep_alive;
1408 1409
            /* looking for 'Connection: close' */
            } else if (c == 'c') {
1410
              parser->header_state = h_matching_connection_close;
1411
            } else {
1412
              parser->header_state = h_general;
1413 1414 1415 1416
            }
            break;

          default:
1417
            parser->header_state = h_general;
1418 1419 1420 1421 1422 1423 1424 1425 1426
            break;
        }
        break;
      }

      case s_header_value:
      {

        if (ch == CR) {
1427 1428
          parser->state = s_header_almost_done;
          CALLBACK_DATA(header_value);
1429 1430 1431 1432
          break;
        }

        if (ch == LF) {
1433 1434 1435
          parser->state = s_header_almost_done;
          CALLBACK_DATA_NOADVANCE(header_value);
          goto reexecute_byte;
1436 1437 1438 1439
        }

        c = LOWER(ch);

1440
        switch (parser->header_state) {
1441 1442 1443 1444 1445 1446 1447 1448 1449
          case h_general:
            break;

          case h_connection:
          case h_transfer_encoding:
            assert(0 && "Shouldn't get here.");
            break;

          case h_content_length:
1450 1451 1452
          {
            uint64_t t;

1453
            if (ch == ' ') break;
1454

1455 1456 1457 1458 1459
            if (!IS_NUM(ch)) {
              SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
              goto error;
            }

1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470
            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;
1471
            break;
1472
          }
1473 1474 1475

          /* Transfer-Encoding: chunked */
          case h_matching_transfer_encoding_chunked:
1476 1477 1478 1479 1480 1481
            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;
1482 1483 1484 1485 1486
            }
            break;

          /* looking for 'Connection: keep-alive' */
          case h_matching_connection_keep_alive:
1487 1488 1489 1490 1491 1492
            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;
1493 1494 1495 1496 1497
            }
            break;

          /* looking for 'Connection: close' */
          case h_matching_connection_close:
1498 1499 1500 1501 1502
            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;
1503 1504 1505 1506 1507 1508
            }
            break;

          case h_transfer_encoding_chunked:
          case h_connection_keep_alive:
          case h_connection_close:
1509
            if (ch != ' ') parser->header_state = h_general;
1510 1511 1512
            break;

          default:
1513 1514
            parser->state = s_header_value;
            parser->header_state = h_general;
1515 1516 1517 1518 1519 1520 1521 1522 1523
            break;
        }
        break;
      }

      case s_header_almost_done:
      {
        STRICT_CHECK(ch != LF);

1524
        parser->state = s_header_value_lws;
1525

1526
        switch (parser->header_state) {
1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538
          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;
        }
1539

1540 1541 1542 1543 1544 1545
        break;
      }

      case s_header_value_lws:
      {
        if (ch == ' ' || ch == '\t')
1546
          parser->state = s_header_value_start;
1547 1548
        else
        {
1549 1550
          parser->state = s_header_field_start;
          goto reexecute_byte;
1551 1552 1553 1554 1555 1556 1557 1558 1559 1560
        }
        break;
      }

      case s_headers_almost_done:
      {
        STRICT_CHECK(ch != LF);

        if (parser->flags & F_TRAILING) {
          /* End of a chunked request */
1561 1562
          parser->state = NEW_MESSAGE();
          CALLBACK_NOTIFY(message_complete);
1563 1564 1565
          break;
        }

1566
        parser->state = s_headers_done;
1567

1568 1569 1570
        /* Set this here so that on_headers_complete() callbacks can see it */
        parser->upgrade =
          (parser->flags & F_UPGRADE || parser->method == HTTP_CONNECT);
1571 1572 1573 1574

        /* 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
1575
         * is needed for the annoying case of recieving a response to a HEAD
1576
         * request.
1577 1578 1579
         *
         * 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.
1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595
         */
        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 */
          }
        }

1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608
        if (HTTP_PARSER_ERRNO(parser) != HPE_OK) {
          return p - data;
        }

        goto reexecute_byte;
      }

      case s_headers_done:
      {
        STRICT_CHECK(ch != LF);

        parser->nread = 0;

1609 1610
        /* Exit, the rest of the connect is in a different protocol. */
        if (parser->upgrade) {
1611 1612
          parser->state = NEW_MESSAGE();
          CALLBACK_NOTIFY(message_complete);
1613 1614 1615 1616
          return (p - data) + 1;
        }

        if (parser->flags & F_SKIPBODY) {
1617 1618
          parser->state = NEW_MESSAGE();
          CALLBACK_NOTIFY(message_complete);
1619 1620
        } else if (parser->flags & F_CHUNKED) {
          /* chunked encoding - ignore Content-Length header */
1621
          parser->state = s_chunk_size_start;
1622 1623 1624
        } else {
          if (parser->content_length == 0) {
            /* Content-Length header given but zero: Content-Length: 0\r\n */
1625 1626 1627
            parser->state = NEW_MESSAGE();
            CALLBACK_NOTIFY(message_complete);
          } else if (parser->content_length != ULLONG_MAX) {
1628
            /* Content-Length header given and non-zero */
1629
            parser->state = s_body_identity;
1630
          } else {
1631 1632
            if (parser->type == HTTP_REQUEST ||
                !http_message_needs_eof(parser)) {
1633
              /* Assume content-length 0 - read the next */
1634 1635
              parser->state = NEW_MESSAGE();
              CALLBACK_NOTIFY(message_complete);
1636 1637
            } else {
              /* Read body until EOF */
1638
              parser->state = s_body_identity_eof;
1639 1640 1641 1642 1643 1644 1645 1646
            }
          }
        }

        break;
      }

      case s_body_identity:
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676
      {
        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;
1677
        }
1678

1679
        break;
1680
      }
1681 1682 1683

      /* read until EOF */
      case s_body_identity_eof:
1684 1685 1686 1687 1688 1689 1690 1691
        MARK(body);
        p = data + len - 1;

        break;

      case s_message_done:
        parser->state = NEW_MESSAGE();
        CALLBACK_NOTIFY(message_complete);
1692 1693 1694 1695
        break;

      case s_chunk_size_start:
      {
1696
        assert(parser->nread == 1);
1697 1698 1699 1700 1701 1702 1703 1704 1705
        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;
1706
        parser->state = s_chunk_size;
1707 1708 1709 1710 1711
        break;
      }

      case s_chunk_size:
      {
1712 1713
        uint64_t t;

1714 1715 1716
        assert(parser->flags & F_CHUNKED);

        if (ch == CR) {
1717
          parser->state = s_chunk_size_almost_done;
1718 1719 1720 1721 1722 1723 1724
          break;
        }

        unhex_val = unhex[(unsigned char)ch];

        if (unhex_val == -1) {
          if (ch == ';' || ch == ' ') {
1725
            parser->state = s_chunk_parameters;
1726 1727 1728 1729 1730 1731 1732
            break;
          }

          SET_ERRNO(HPE_INVALID_CHUNK_SIZE);
          goto error;
        }

1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743
        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;
1744 1745 1746 1747 1748 1749
        break;
      }

      case s_chunk_parameters:
      {
        assert(parser->flags & F_CHUNKED);
1750
        /* just ignore this. TODO check for overflow */
1751
        if (ch == CR) {
1752
          parser->state = s_chunk_size_almost_done;
1753 1754 1755 1756 1757 1758 1759 1760 1761 1762
          break;
        }
        break;
      }

      case s_chunk_size_almost_done:
      {
        assert(parser->flags & F_CHUNKED);
        STRICT_CHECK(ch != LF);

1763
        parser->nread = 0;
1764 1765 1766

        if (parser->content_length == 0) {
          parser->flags |= F_TRAILING;
1767
          parser->state = s_header_field_start;
1768
        } else {
1769
          parser->state = s_chunk_data;
1770 1771 1772 1773 1774 1775
        }
        break;
      }

      case s_chunk_data:
      {
1776 1777
        uint64_t to_read = MIN(parser->content_length,
                               (uint64_t) ((data + len) - p));
1778

1779 1780 1781
        assert(parser->flags & F_CHUNKED);
        assert(parser->content_length != 0
            && parser->content_length != ULLONG_MAX);
1782

1783 1784 1785 1786 1787 1788
        /* 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;
1789

1790 1791
        if (parser->content_length == 0) {
          parser->state = s_chunk_data_almost_done;
1792 1793 1794 1795 1796 1797 1798
        }

        break;
      }

      case s_chunk_data_almost_done:
        assert(parser->flags & F_CHUNKED);
1799
        assert(parser->content_length == 0);
1800
        STRICT_CHECK(ch != CR);
1801 1802
        parser->state = s_chunk_data_done;
        CALLBACK_DATA(body);
1803 1804 1805 1806 1807
        break;

      case s_chunk_data_done:
        assert(parser->flags & F_CHUNKED);
        STRICT_CHECK(ch != LF);
1808 1809
        parser->nread = 0;
        parser->state = s_chunk_size_start;
1810 1811 1812 1813 1814 1815 1816 1817 1818
        break;

      default:
        assert(0 && "unhandled state");
        SET_ERRNO(HPE_INVALID_INTERNAL_STATE);
        goto error;
    }
  }

1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832
  /* 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);
1833

1834 1835 1836 1837
  CALLBACK_DATA_NOADVANCE(header_field);
  CALLBACK_DATA_NOADVANCE(header_value);
  CALLBACK_DATA_NOADVANCE(url);
  CALLBACK_DATA_NOADVANCE(body);
1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849

  return len;

error:
  if (HTTP_PARSER_ERRNO(parser) == HPE_OK) {
    SET_ERRNO(HPE_UNKNOWN);
  }

  return (p - data);
}


1850
/* Does the parser need to see an EOF to find the end of the message? */
1851
int
1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875
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)
1876 1877 1878 1879 1880 1881 1882 1883
{
  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 */
1884
    if (!(parser->flags & F_CONNECTION_KEEP_ALIVE)) {
1885 1886 1887
      return 0;
    }
  }
1888 1889

  return !http_message_needs_eof(parser);
1890 1891 1892
}


1893 1894
const char *
http_method_str (enum http_method m)
1895
{
1896
  return ELEM_AT(method_strings, m, "<unknown>");
1897 1898 1899 1900 1901 1902
}


void
http_parser_init (http_parser *parser, enum http_parser_type t)
{
1903 1904 1905
  void *data = parser->data; /* preserve application data */
  memset(parser, 0, sizeof(*parser));
  parser->data = data;
1906 1907
  parser->type = t;
  parser->state = (t == HTTP_REQUEST ? s_start_req : (t == HTTP_RESPONSE ? s_start_res : s_start_req_or_res));
1908
  parser->http_errno = HPE_OK;
1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921
}

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;
}
1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177

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;

  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 = 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 = 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 = 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 = 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_host_port_start:
    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;

  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 = 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;
}