forked from nodejs/http-parser
/
HttpParser.cs
2164 lines (1932 loc) · 97.3 KB
/
HttpParser.cs
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/* 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.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace HttpParser
{
public class HttpParser
{
private const ulong HTTP_MAX_HEADER_SIZE = (80*1024);
private const string PROXY_CONNECTION = "proxy-connection";
private const string CONNECTION = "connection";
private const string CONTENT_LENGTH = "content-length";
private const string TRANSFER_ENCODING = "transfer-encoding";
private const string UPGRADE = "upgrade";
private const string CHUNKED = "chunked";
private const string KEEP_ALIVE = "keep-alive";
private const string CLOSE = "close";
private HttpParserSettings _settings;
private State _state;
private HeaderStates _header_state;
private int _index;
private ulong _nread;
private Flags _flags;
private long _content_length;
private HttpParserType _type;
/** READ-ONLY **/
private short _http_major;
private short _http_minor;
private short _status_code; /* responses only */
private HttpMethod _method; /* requests only */
private HttpErrNo _http_errno;
/* 1 = Upgrade header was present and the parser has exited because of that.
* 0 = No upgrade header present.
* Should be checked when http_parser_execute() returns in addition to
* error checking.
*/
private byte _upgrade = 1;
public HttpParser(HttpParserSettings settings, HttpParserType t)
{
_settings = settings;
_settings.Wrap();
_type = t;
_state = (t == HttpParserType.HTTP_REQUEST ? State.s_start_req : (t == HttpParserType.HTTP_RESPONSE ? State.s_start_res : State.s_start_req_or_res));
_nread = 0;
_upgrade = 0;
_flags = 0;
_method = 0;
_http_errno = HttpErrNo.OK;
}
#region Properties
public HttpMethod Method
{
get
{
return _method;
}
}
public HttpErrNo ErrNo
{
get
{
return _http_errno;
}
}
public short HttpMajor
{
get
{
return _http_major;
}
}
public short HttpMinor
{
get
{
return _http_minor;
}
}
public short StatusCode
{
get
{
return _status_code;
}
}
public bool Upgrade
{
get
{
return _upgrade == 1;
}
}
#endregion
private void SET_ERRNO(HttpErrNo http_errno)
{
_http_errno = http_errno;
}
private bool PARSING_HEADER(State state)
{
return state <= State.s_headers_almost_done;
}
private static char LOWER(char c)
{
return (char)(c | 0x20);
}
private static char TOKEN(char c)
{
return LookupTables.tokens[c];
}
private static bool IS_ALPHA(char c)
{
return (LOWER(c) >= 'a' && LOWER(c) <= 'z');
}
private static bool IS_NUM(char c)
{
return (c >= '0' && c <= '9');
}
private static bool IS_ALPHANUM(char c)
{
return (IS_ALPHA(c) || IS_NUM(c));
}
private static long MIN(long a, long b)
{
return ((a) < (b) ? (a) : (b));
}
#if HTTP_PARSER_STRICT
private bool IS_URL_CHAR(char c)
{
return(LookupTables.normal_url_char[c] != 0);
}
#else
private bool IS_URL_CHAR(char c)
{
return (LookupTables.normal_url_char[c] != 0 || ((c & 0x80) != 0));
}
#endif
#if HTTP_PARSER_STRICT
private bool IS_HOST_CHAR(char c) {
return (IS_ALPHANUM(c) || (c) == '.' || (c) == '-');
}
#else
private bool IS_HOST_CHAR(char c)
{
return (IS_ALPHANUM(c) || (c) == '.' || (c) == '-' || (c) == '_');
}
#endif
private State start_state()
{
return (_type == HttpParserType.HTTP_REQUEST ? State.s_start_req : State.s_start_res);
}
#if HTTP_PARSER_STRICT
private void STRICT_CHECK(bool cond)
{
if (cond)
{
SET_ERRNO(HttpErrNo.STRICT);
throw new ParseException();
}
}
#else
private void STRICT_CHECK(bool cond) { }
#endif
#if HTTP_PARSER_STRICT
private State NEW_MESSAGE()
{
return (http_should_keep_alive() != 0 ? start_state() : State.s_dead);
}
#else
private State NEW_MESSAGE()
{
return start_state();
}
#endif
public unsafe uint Execute(byte[] data, int length)
{
fixed (byte* p = data)
{
return Execute(p, (uint)length);
}
}
public unsafe uint Execute(byte* data, uint len)
{
char c, ch;
sbyte unhex_val;
byte* p = data;
byte *pe;
long to_read;
State state;
HeaderStates header_state;
int index = _index;
ulong nread = _nread;
/* technically we could combine all of these (except for url_mark) into one
variable, saving stack space, but it seems more clear to have them
separated. */
byte *header_field_mark = null;
byte *header_value_mark = null;
byte *url_mark = null;
/* We're in an error state. Don't bother doing anything. */
if (_http_errno != HttpErrNo.OK)
{
return 0;
}
state = _state;
header_state = _header_state;
if (len == 0)
{
switch (state)
{
case State.s_body_identity_eof:
if (_settings.on_message_complete != null)
{
if (0 != _settings.on_message_complete(this))
{
SET_ERRNO(HttpErrNo.CB_message_complete);
return (uint)(p - data);
}
}
return 0;
case State.s_dead:
case State.s_start_req_or_res:
case State.s_start_res:
case State.s_start_req:
return 0;
default:
SET_ERRNO(HttpErrNo.INVALID_EOF_STATE);
return 1;
}
}
if (state == State.s_header_field)
header_field_mark = data;
if (state == State.s_header_value)
header_value_mark = data;
if (state == State.s_req_path || state == State.s_req_schema || state == State.s_req_schema_slash
|| state == State.s_req_schema_slash_slash || state == State.s_req_port
|| state == State.s_req_query_string_start || state == State.s_req_query_string
|| state == State.s_req_host
|| state == State.s_req_fragment_start || state == State.s_req_fragment)
url_mark = data;
try
{
for (p = data, pe = data + len; p != pe; p++)
{
ch = (char)*p;
if (PARSING_HEADER(state))
{
++nread;
/* Buffer overflow attack */
if (nread > HTTP_MAX_HEADER_SIZE)
{
SET_ERRNO(HttpErrNo.HEADER_OVERFLOW);
throw new ParseException();
}
}
switch (state)
{
case State.s_dead:
/* this state is used after a 'Connection: close' message
* the parser will error out if it reads another message
*/
SET_ERRNO(HttpErrNo.CLOSED_CONNECTION);
throw new ParseException();
case State.s_start_req_or_res:
if (ch == '\r' || ch == '\n')
break;
_flags = 0;
_content_length = -1;
if (_settings.on_message_begin != null)
{
if (0 != _settings.on_message_begin(this))
{
SET_ERRNO(HttpErrNo.CB_message_begin);
return (uint)(p - data);
}
}
if (ch == 'H')
state = State.s_res_or_resp_H;
else
{
_type = HttpParserType.HTTP_REQUEST;
goto start_req_method_assign;
}
break;
case State.s_res_or_resp_H:
if (ch == 'T')
{
_type = HttpParserType.HTTP_RESPONSE;
state = State.s_res_HT;
}
else
{
if (ch != 'E')
{
SET_ERRNO(HttpErrNo.INVALID_CONSTANT);
throw new ParseException();
}
_type = HttpParserType.HTTP_REQUEST;
_method = HttpMethod.HTTP_HEAD;
index = 2;
state = State.s_req_method;
}
break;
case State.s_start_res:
{
_flags = 0;
_content_length = -1;
if (_settings.on_message_begin != null)
{
if (0 != _settings.on_message_begin(this))
{
SET_ERRNO(HttpErrNo.CB_message_begin);
return (uint)(p - data);
}
}
switch (ch)
{
case 'H':
state = State.s_res_H;
break;
case '\r':
case '\n':
break;
default:
SET_ERRNO(HttpErrNo.INVALID_CONSTANT);
throw new ParseException();
}
break;
}
case State.s_res_H:
STRICT_CHECK(ch != 'T');
state = State.s_res_HT;
break;
case State.s_res_HT:
STRICT_CHECK(ch != 'T');
state = State.s_res_HTT;
break;
case State.s_res_HTT:
STRICT_CHECK(ch != 'P');
state = State.s_res_HTTP;
break;
case State.s_res_HTTP:
STRICT_CHECK(ch != '/');
state = State.s_res_first_http_major;
break;
case State.s_res_first_http_major:
if (ch < '0' || ch > '9')
{
SET_ERRNO(HttpErrNo.INVALID_VERSION);
throw new ParseException();
}
_http_major = (short)(ch - '0');
state = State.s_res_http_major;
break;
/* major HTTP version or dot */
case State.s_res_http_major:
{
if (ch == '.')
{
state = State.s_res_first_http_minor;
break;
}
if (!IS_NUM(ch))
{
SET_ERRNO(HttpErrNo.INVALID_VERSION);
throw new ParseException();
}
_http_major = (short)(_http_major * 10);
_http_major = (short)(_http_major + (ch - '0'));
if (_http_major > 999)
{
SET_ERRNO(HttpErrNo.INVALID_VERSION);
throw new ParseException();
}
break;
}
/* first digit of minor HTTP version */
case State.s_res_first_http_minor:
if (!IS_NUM(ch))
{
SET_ERRNO(HttpErrNo.INVALID_VERSION);
throw new ParseException();
}
_http_minor = (short)(ch - '0');
state = State.s_res_http_minor;
break;
/* minor HTTP version or end of request line */
case State.s_res_http_minor:
{
if (ch == ' ')
{
state = State.s_res_first_status_code;
break;
}
if (!IS_NUM(ch))
{
SET_ERRNO(HttpErrNo.INVALID_VERSION);
throw new ParseException();
}
_http_minor *= 10;
_http_minor += (short)(ch - '0');
if (_http_minor > 999)
{
SET_ERRNO(HttpErrNo.INVALID_VERSION);
throw new ParseException();
}
break;
}
case State.s_res_first_status_code:
{
if (!IS_NUM(ch))
{
if (ch == ' ')
{
break;
}
SET_ERRNO(HttpErrNo.INVALID_STATUS);
throw new ParseException();
}
_status_code = (short)(ch - '0');
state = State.s_res_status_code;
break;
}
case State.s_res_status_code:
{
if (!IS_NUM(ch))
{
switch (ch)
{
case ' ':
state = State.s_res_status;
break;
case '\r':
state = State.s_res_line_almost_done;
break;
case '\n':
state = State.s_header_field_start;
break;
default:
SET_ERRNO(HttpErrNo.INVALID_STATUS);
throw new ParseException();
}
break;
}
_status_code *= 10;
_status_code += (short)(ch - '0');
if (_status_code > 999)
{
SET_ERRNO(HttpErrNo.INVALID_STATUS);
throw new ParseException();
}
break;
}
case State.s_res_status:
/* the human readable status. e.g. "NOT FOUND"
* we are not humans so just ignore this */
if (ch == '\r')
{
state = State.s_res_line_almost_done;
break;
}
if (ch == '\n')
{
state = State.s_header_field_start;
break;
}
break;
case State.s_res_line_almost_done:
STRICT_CHECK(ch != '\n');
state = State.s_header_field_start;
break;
case State.s_start_req:
if (ch == '\r' || ch == '\n')
break;
_flags = 0;
_content_length = -1;
if (_settings.on_message_begin != null)
{
if (0 != _settings.on_message_begin(this))
{
SET_ERRNO(HttpErrNo.CB_message_begin);
return (uint)(p - data);
}
}
if (!IS_ALPHA(ch))
{
SET_ERRNO(HttpErrNo.INVALID_METHOD);
throw new ParseException();
}
start_req_method_assign:
_method = (HttpMethod)0;
index = 1;
switch (ch)
{
case 'C': _method = HttpMethod.HTTP_CONNECT; /* or COPY, CHECKOUT */ break;
case 'D': _method = HttpMethod.HTTP_DELETE; break;
case 'G': _method = HttpMethod.HTTP_GET; break;
case 'H': _method = HttpMethod.HTTP_HEAD; break;
case 'L': _method = HttpMethod.HTTP_LOCK; break;
case 'M': _method = HttpMethod.HTTP_MKCOL; /* or MOVE, MKACTIVITY, MERGE, M-SEARCH */ break;
case 'N': _method = HttpMethod.HTTP_NOTIFY; break;
case 'O': _method = HttpMethod.HTTP_OPTIONS; break;
case 'P': _method = HttpMethod.HTTP_POST;
/* or PROPFIND or PROPPATCH or PUT or PATCH */
break;
case 'R': _method = HttpMethod.HTTP_REPORT; break;
case 'S': _method = HttpMethod.HTTP_SUBSCRIBE; break;
case 'T': _method = HttpMethod.HTTP_TRACE; break;
case 'U': _method = HttpMethod.HTTP_UNLOCK; /* or UNSUBSCRIBE */ break;
default:
SET_ERRNO(HttpErrNo.INVALID_METHOD);
throw new ParseException();
}
state = State.s_req_method;
break;
case State.s_req_method:
{
if (ch == '\0')
{
SET_ERRNO(HttpErrNo.INVALID_METHOD);
throw new ParseException();
}
fixed(char *matcher = LookupTables.method_strings[(int)_method]) {
if (ch == ' ' && matcher[index] == '\0')
{
state = State.s_req_spaces_before_url;
}
else if (ch == matcher[index])
{
; /* nada */
}
else if (_method == HttpMethod.HTTP_CONNECT)
{
if (index == 1 && ch == 'H')
{
_method = HttpMethod.HTTP_CHECKOUT;
}
else if (index == 2 && ch == 'P')
{
_method = HttpMethod.HTTP_COPY;
}
else
{
throw new ParseException();
}
}
else if (_method == HttpMethod.HTTP_MKCOL)
{
if (index == 1 && ch == 'O')
{
_method = HttpMethod.HTTP_MOVE;
}
else if (index == 1 && ch == 'E')
{
_method = HttpMethod.HTTP_MERGE;
}
else if (index == 1 && ch == '-')
{
_method = HttpMethod.HTTP_MSEARCH;
}
else if (index == 2 && ch == 'A')
{
_method = HttpMethod.HTTP_MKACTIVITY;
}
else
{
throw new ParseException();
}
}
else if (index == 1 && _method == HttpMethod.HTTP_POST)
{
if (ch == 'R')
{
_method = HttpMethod.HTTP_PROPFIND; /* or HttpMethod.HTTP_PROPPATCH */
}
else if (ch == 'U')
{
_method = HttpMethod.HTTP_PUT;
}
else if (ch == 'A')
{
_method = HttpMethod.HTTP_PATCH;
}
else
{
throw new ParseException();
}
}
else if (index == 2 && _method == HttpMethod.HTTP_UNLOCK && ch == 'S')
{
_method = HttpMethod.HTTP_UNSUBSCRIBE;
}
else if (index == 4 && _method == HttpMethod.HTTP_PROPFIND && ch == 'P')
{
_method = HttpMethod.HTTP_PROPPATCH;
}
else
{
SET_ERRNO(HttpErrNo.INVALID_METHOD);
throw new ParseException();
}
}
++index;
break;
}
case State.s_req_spaces_before_url:
{
if (ch == ' ') break;
if (ch == '/' || ch == '*')
{
url_mark = p;
state = State.s_req_path;
break;
}
/* Proxied requests are followed by scheme of an absolute URI (alpha).
* CONNECT is followed by a hostname, which begins with alphanum.
* All other methods are followed by '/' or '*' (handled above).
*/
if (IS_ALPHA(ch) || (_method == HttpMethod.HTTP_CONNECT && IS_NUM(ch)))
{
url_mark = p;
state = (_method == HttpMethod.HTTP_CONNECT) ? State.s_req_host : State.s_req_schema;
break;
}
SET_ERRNO(HttpErrNo.INVALID_URL);
throw new ParseException();
}
case State.s_req_schema:
{
if (IS_ALPHA(ch)) break;
if (ch == ':')
{
state = State.s_req_schema_slash;
break;
}
SET_ERRNO(HttpErrNo.INVALID_URL);
throw new ParseException();
}
case State.s_req_schema_slash:
STRICT_CHECK(ch != '/');
state = State.s_req_schema_slash_slash;
break;
case State.s_req_schema_slash_slash:
STRICT_CHECK(ch != '/');
state = State.s_req_host;
break;
case State.s_req_host:
{
if (IS_HOST_CHAR(ch)) break;
switch (ch)
{
case ':':
state = State.s_req_port;
break;
case '/':
state = State.s_req_path;
break;
case ' ':
/* The request line looks like:
* "GET http://foo.bar.com HTTP/1.1"
* That is, there is no path.
*/
if (url_mark != null)
{
if (_settings.on_url != null)
{
if (0 != _settings.on_url(this, url_mark, (uint)(p - url_mark)))
{
SET_ERRNO(HttpErrNo.CB_url);
return (uint)(p - data);
}
}
url_mark = null;
}
state = State.s_req_http_start;
break;
case '?':
state = State.s_req_query_string_start;
break;
default:
SET_ERRNO(HttpErrNo.INVALID_HOST);
throw new ParseException();
}
break;
}
case State.s_req_port:
{
if (IS_NUM(ch)) break;
switch (ch)
{
case '/':
state = State.s_req_path;
break;
case ' ':
/* The request line looks like:
* "GET http://foo.bar.com:1234 HTTP/1.1"
* That is, there is no path.
*/
if (url_mark != null)
{
if (_settings.on_url != null)
{
if (0 != _settings.on_url(this, url_mark, (uint)(p - url_mark)))
{
SET_ERRNO(HttpErrNo.CB_url);
return (uint)(p - data);
}
}
url_mark = null;
}
state = State.s_req_http_start;
break;
case '?':
state = State.s_req_query_string_start;
break;
default:
SET_ERRNO(HttpErrNo.INVALID_PORT);
throw new ParseException();
}
break;
}
case State.s_req_path:
{
if (IS_URL_CHAR(ch)) break;
switch (ch)
{
case ' ':
if (url_mark != null)
{
if (_settings.on_url != null)
{
if (0 != _settings.on_url(this, url_mark, (uint)(p - url_mark)))
{
SET_ERRNO(HttpErrNo.CB_url);
return (uint)(p - data);
}
}
url_mark = null;
}
state = State.s_req_http_start;
break;
case '\r':
if (url_mark != null)
{
if (_settings.on_url != null)
{
if (0 != _settings.on_url(this, url_mark, (uint)(p - url_mark)))
{
SET_ERRNO(HttpErrNo.CB_url);
return (uint)(p - data);
}
}
url_mark = null;
}
_http_major = 0;
_http_minor = 9;
state = State.s_req_line_almost_done;
break;
case '\n':
if (url_mark != null)
{
if (_settings.on_url != null)
{
if (0 != _settings.on_url(this, url_mark, (uint)(p - url_mark)))
{
SET_ERRNO(HttpErrNo.CB_url);
return (uint)(p - data);
}
}
url_mark = null;
}
_http_major = 0;
_http_minor = 9;
state = State.s_header_field_start;
break;
case '?':
state = State.s_req_query_string_start;
break;
case '#':
state = State.s_req_fragment_start;
break;
default:
SET_ERRNO(HttpErrNo.INVALID_PATH);
throw new ParseException();
}
break;
}
case State.s_req_query_string_start:
{
if (IS_URL_CHAR(ch))
{
state = State.s_req_query_string;
break;
}
switch (ch)
{
case '?':
break; /* XXX ignore extra '?' ... is this right? */
case ' ':
if (url_mark != null)
{
if (_settings.on_url != null)
{
if (0 != _settings.on_url(this, url_mark, (uint)(p - url_mark)))
{
SET_ERRNO(HttpErrNo.CB_url);
return (uint)(p - data);
}
}
url_mark = null;
}
state = State.s_req_http_start;
break;
case '\r':
if (url_mark != null)
{
if (_settings.on_url != null)
{
if (0 != _settings.on_url(this, url_mark, (uint)(p - url_mark)))
{
SET_ERRNO(HttpErrNo.CB_url);
return (uint)(p - data);
}
}
url_mark = null;
};
_http_major = 0;
_http_minor = 9;
state = State.s_req_line_almost_done;
break;
case '\n':
if (url_mark != null)
{
if (_settings.on_url != null)
{
if (0 != _settings.on_url(this, url_mark, (uint)(p - url_mark)))
{
SET_ERRNO(HttpErrNo.CB_url);
return (uint)(p - data);
}
}
url_mark = null;
}
_http_major = 0;
_http_minor = 9;
state = State.s_header_field_start;
break;
case '#':
state = State.s_req_fragment_start;
break;
default:
SET_ERRNO(HttpErrNo.INVALID_QUERY_STRING);
throw new ParseException();
}
break;
}
case State.s_req_query_string:
{
if (IS_URL_CHAR(ch)) break;
switch (ch)
{
case '?':
/* allow extra '?' in query string */
break;
case ' ':
if (url_mark != null)
{
if (_settings.on_url != null)
{
if (0 != _settings.on_url(this, url_mark, (uint)(p - url_mark)))
{
SET_ERRNO(HttpErrNo.CB_url);
return (uint)(p - data);
}
}
url_mark = null;
}
state = State.s_req_http_start;
break;
case '\r':
if (url_mark != null)