aboutsummaryrefslogtreecommitdiffstats
path: root/lib/inets/src/http_server/httpd_request.erl
blob: 3ff07616f97cbfb701527b4d1543c5fd6b769bcb (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2005-2015. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%

-module(httpd_request).

-include_lib("inets/src/http_lib/http_internal.hrl").
-include("httpd.hrl").
-include("httpd_internal.hrl").

-export([
	 parse/1, 
	 whole_body/2, 
	 validate/3, 
	 update_mod_data/5,
	 body_data/2
	]).

%% Callback API - used for example if the header/body is received a
%% little at a time on a socket. 
-export([
	 parse_method/1, parse_uri/1, parse_version/1, parse_headers/1,
	 whole_body/1
	]).


%%%=========================================================================
%%%  Internal application API
%%%=========================================================================
parse([Bin, MaxSizes]) ->
    ?hdrt("parse", [{bin, Bin}, {max_sizes, MaxSizes}]),    
    parse_method(Bin, [], 0, proplists:get_value(max_method, MaxSizes), MaxSizes, []);
parse(Unknown) ->
    ?hdrt("parse", [{unknown, Unknown}]),
    exit({bad_args, Unknown}).

%% Functions that may be returned during the decoding process
%% if the input data is incompleate. 
parse_method([Bin, Method, Current, Max, MaxSizes, Result]) ->
    parse_method(Bin, Method, Current, Max, MaxSizes, Result).

parse_uri([Bin, URI, Current, Max, MaxSizes, Result]) ->
    parse_uri(Bin, URI, Current, Max, MaxSizes, Result).

parse_version([Bin, Rest, Version, Current, Max, MaxSizes, Result]) ->
    parse_version(<<Rest/binary, Bin/binary>>, Version, Current, Max, MaxSizes, 
		  Result).

parse_headers([Bin, Rest, Header, Headers, Current, Max, MaxSizes, Result]) ->
    parse_headers(<<Rest/binary, Bin/binary>>, 
		  Header, Headers, Current, Max, MaxSizes, Result).

whole_body([Bin, Body, Length])  ->
    whole_body(<<Body/binary, Bin/binary>>, Length).    


%% Separate the body for this request from a possible piplined new 
%% request and convert the body data to "string" format.
body_data(Headers, Body) ->    
    ContentLength = list_to_integer(Headers#http_request_h.'content-length'),
    case size(Body) - ContentLength of
 	0 ->
 	    {binary_to_list(Body), <<>>};
 	_ ->
 	    <<BodyThisReq:ContentLength/binary, Next/binary>> = Body,   
 	    {binary_to_list(BodyThisReq), Next}
    end.


%%-------------------------------------------------------------------------
%% validate(Method, Uri, Version) -> ok | {error, {bad_request, Reason} |
%%			     {error, {not_supported, {Method, Uri, Version}}
%%      Method = "HEAD" | "GET" | "POST" | "TRACE" | "PUT" | "DELETE"
%%      Uri = uri()
%%      Version = "HTTP/N.M"      
%% Description: Checks that HTTP-request-line is valid.
%%------------------------------------------------------------------------- 
validate("HEAD", Uri, "HTTP/1." ++ _N) ->
    validate_uri(Uri);
validate("GET", Uri, []) -> %% Simple HTTP/0.9 
    validate_uri(Uri);
validate("GET", Uri, "HTTP/0.9") ->
    validate_uri(Uri);
validate("GET", Uri, "HTTP/1." ++ _N) ->
    validate_uri(Uri);
validate("PUT", Uri, "HTTP/1." ++ _N) ->
    validate_uri(Uri);
validate("DELETE", Uri, "HTTP/1." ++ _N) ->
    validate_uri(Uri);
validate("POST", Uri, "HTTP/1." ++ _N) ->
    validate_uri(Uri);
validate("TRACE", Uri, "HTTP/1." ++ N) when hd(N) >= $1 ->
    validate_uri(Uri);
validate(Method, Uri, Version) ->
    case validate_version(Version) of
	true ->
	    {error, {not_supported, {Method, Uri, Version}}};
	false ->
	    {error, {bad_version, Version}}
    end.
%%----------------------------------------------------------------------
%% The request is passed through the server as a record of type mod 
%% create it.
%% ----------------------------------------------------------------------
update_mod_data(ModData, Method, RequestURI, HTTPVersion, Headers)-> 
    PersistentConn = get_persistens(HTTPVersion, Headers, 
				    ModData#mod.config_db),
    {ok, ModData#mod{data = [],
		     method = Method,
		     absolute_uri = format_absolute_uri(RequestURI, 
							Headers),
		     request_uri = format_request_uri(RequestURI),
		     http_version = HTTPVersion,
		     request_line = Method ++ " " ++ RequestURI ++ 
		     " " ++ HTTPVersion,
		     parsed_header = Headers,
		     connection = PersistentConn}}.

%%%========================================================================
%%% Internal functions
%%%========================================================================
parse_method(<<>>, Method, Current, Max, MaxSizes, Result) ->
    {?MODULE, parse_method, [Method, Current, Max, MaxSizes, Result]};
parse_method(<<?SP, Rest/binary>>, Method, _Current, _Max, MaxSizes, Result) ->
    parse_uri(Rest, [], 0,  proplists:get_value(max_uri, MaxSizes), MaxSizes,
	      [string:strip(lists:reverse(Method)) | Result]);
parse_method(<<Octet, Rest/binary>>, Method, Current, Max, MaxSizes, Result) when Current =< Max ->
    parse_method(Rest, [Octet | Method], Current + 1, Max, MaxSizes, Result);
parse_method(_, _, _, Max, _, _) ->
    %% We do not know the version of the client as it comes after the
    %% method send the lowest version in the response so that the client
    %% will be able to handle it.
    {error, {size_error, Max, 413, "Method unreasonably long"}, lowest_version()}.

parse_uri(_, _, Current, MaxURI, _, _) 
  when (Current > MaxURI) andalso (MaxURI =/= nolimit) -> 
    %% We do not know the version of the client as it comes after the
    %% uri send the lowest version in the response so that the client
    %% will be able to handle it.
    {error, {size_error, MaxURI, 414, "URI unreasonably long"},lowest_version()};
parse_uri(<<>>, URI, Current, Max, MaxSizes, Result) ->
    {?MODULE, parse_uri, [URI, Current, Max, MaxSizes, Result]};
parse_uri(<<?SP, Rest/binary>>, URI, _, _, MaxSizes, Result) -> 
    parse_version(Rest, [], 0, proplists:get_value(max_version, MaxSizes), MaxSizes, 
		  [string:strip(lists:reverse(URI)) | Result]);
%% Can happen if it is a simple HTTP/0.9 request e.i "GET /\r\n\r\n"
parse_uri(<<?CR, _Rest/binary>> = Data, URI, _, _, MaxSizes, Result) ->
    parse_version(Data, [], 0, proplists:get_value(max_version, MaxSizes), MaxSizes, 
		  [string:strip(lists:reverse(URI)) | Result]);
parse_uri(<<Octet, Rest/binary>>, URI, Current, Max, MaxSizes, Result) ->
    parse_uri(Rest, [Octet | URI], Current + 1, Max, MaxSizes, Result).

parse_version(<<>>, Version, Current, Max, MaxSizes, Result) ->
    {?MODULE, parse_version, [<<>>, Version, Current, Max, MaxSizes, Result]};
parse_version(<<?LF, Rest/binary>>, Version, Current, Max, MaxSizes, Result) ->
    %% If ?CR is is missing RFC2616 section-19.3 
    parse_version(<<?CR, ?LF, Rest/binary>>, Version, Current, Max, MaxSizes, Result);
parse_version(<<?CR, ?LF, Rest/binary>>, Version, _, _,  MaxSizes, Result) ->
    parse_headers(Rest, [], [], 0, proplists:get_value(max_header, MaxSizes), MaxSizes, 
		  [string:strip(lists:reverse(Version)) | Result]);
parse_version(<<?CR>> = Data, Version, Current, Max, MaxSizes, Result) ->
    {?MODULE, parse_version, [Data, Version, Current, Max, MaxSizes, Result]};
parse_version(<<Octet, Rest/binary>>, Version, Current, Max, MaxSizes, Result)  when Current =< Max ->
    parse_version(Rest, [Octet | Version], Current + 1, Max, MaxSizes, Result);
parse_version(_, _, _, Max,_,_) ->
    {error, {size_error, Max, 413, "Version string unreasonably long"}, lowest_version()}.

parse_headers(_, _, _, Current, Max, _, Result) 
  when Max =/= nolimit andalso Current > Max -> 
    HttpVersion = lists:nth(3, lists:reverse(Result)),
    {error, {size_error, Max, 413, "Headers unreasonably long"}, HttpVersion};

parse_headers(<<>>, Header, Headers, Current, Max, MaxSizes, Result) ->
    {?MODULE, parse_headers, [<<>>, Header, Headers, Current, Max, 
			      MaxSizes, Result]};
parse_headers(<<?CR,?LF,?LF,Body/binary>>, [], [], Current, Max, MaxSizes, Result) ->
    %% If ?CR is is missing RFC2616 section-19.3 
    parse_headers(<<?CR,?LF,?CR,?LF,Body/binary>>, [], [], Current, Max,  
		  MaxSizes, Result);

parse_headers(<<?LF,?LF,Body/binary>>, [], [], Current, Max,  MaxSizes, Result) ->
    %% If ?CR is is missing RFC2616 section-19.3 
    parse_headers(<<?CR,?LF,?CR,?LF,Body/binary>>, [], [], Current, Max, 
		  MaxSizes, Result);

parse_headers(<<?CR,?LF,?CR,?LF,Body/binary>>, [], [], _, _,  _, Result) ->
    NewResult = list_to_tuple(lists:reverse([Body, {#http_request_h{}, []} |
					     Result])),
    {ok, NewResult};
parse_headers(<<?CR,?LF,?CR,?LF,Body/binary>>, Header, Headers, _, _,
	      MaxSizes, Result) ->
    case http_request:key_value(lists:reverse(Header)) of
	undefined -> %% Skip headers with missing :
	    {ok, list_to_tuple(lists:reverse([Body, {http_request:headers(Headers, #http_request_h{}), Headers} | Result]))};
	NewHeader ->
	    case check_header(NewHeader, MaxSizes) of 
		ok ->
		    {ok, list_to_tuple(lists:reverse([Body, {http_request:headers([NewHeader | Headers], 
										  #http_request_h{}),  
							     [NewHeader | Headers]} | Result]))};
		
		{error, Reason} ->
		    HttpVersion = lists:nth(3, lists:reverse(Result)),
		    {error, Reason, HttpVersion}
	    end
    end;

parse_headers(<<?CR,?LF,?CR>> = Data, Header, Headers, Current, Max, 
	      MaxSizes, Result) ->
    {?MODULE, parse_headers, [Data, Header, Headers, Current, Max, 
			      MaxSizes, Result]};
parse_headers(<<?LF>>, [], [], Current, Max, MaxSizes, Result) ->
    %% If ?CR is is missing RFC2616 section-19.3 
    parse_headers(<<?CR,?LF>>, [], [], Current, Max, MaxSizes, Result);

%% There where no headers, which is unlikely to happen.
parse_headers(<<?CR,?LF>>, [], [], _, _, _, Result) ->
     NewResult = list_to_tuple(lists:reverse([<<>>, {#http_request_h{}, []} |
					      Result])),
    {ok, NewResult};

parse_headers(<<?LF>>, Header, Headers, Current, Max,  
	      MaxSizes, Result) ->
    %% If ?CR is is missing RFC2616 section-19.3 
    parse_headers(<<?CR,?LF>>, Header, Headers, Current, Max, MaxSizes, Result);

parse_headers(<<?CR,?LF>> = Data, Header, Headers, Current, Max, 
	      MaxSizes, Result) ->
    {?MODULE, parse_headers, [Data, Header, Headers, Current, Max, 
			      MaxSizes, Result]};
parse_headers(<<?LF, Octet, Rest/binary>>, Header, Headers, Current, Max,
	      MaxSizes, Result) ->
    %% If ?CR is is missing RFC2616 section-19.3 
    parse_headers(<<?CR,?LF, Octet, Rest/binary>>, Header, Headers, Current, Max,
		  MaxSizes, Result); 
parse_headers(<<?CR,?LF, Octet, Rest/binary>>, Header, Headers, _, Max,
	      MaxSizes, Result) ->
    case http_request:key_value(lists:reverse(Header)) of
	undefined -> %% Skip headers with missing :
	    parse_headers(Rest, [Octet], Headers, 
			  0, Max, MaxSizes, Result);
	NewHeader ->
	    case check_header(NewHeader, MaxSizes) of 
		ok ->
		    parse_headers(Rest, [Octet], [NewHeader | Headers], 
				  0, Max, MaxSizes, Result);
		{error, Reason} ->
		    HttpVersion = lists:nth(3, lists:reverse(Result)),
		    {error, Reason, HttpVersion}
	    end
    end;
	
parse_headers(<<?CR>> = Data, Header, Headers, Current, Max,  
	      MaxSizes, Result) ->
    {?MODULE, parse_headers, [Data, Header, Headers, Current, Max, 
			      MaxSizes, Result]};
parse_headers(<<?LF>>, Header, Headers, Current,  Max, 
	      MaxSizes, Result) ->
    %% If ?CR is is missing RFC2616 section-19.3 
    parse_headers(<<?CR, ?LF>>, Header, Headers, Current, Max,  
		  MaxSizes, Result);

parse_headers(<<Octet, Rest/binary>>, Header, Headers, Current,
	      Max, MaxSizes, Result) ->
    parse_headers(Rest, [Octet | Header], Headers, Current + 1, Max,
		  MaxSizes, Result).

whole_body(Body, Length) ->
    case size(Body) of
	N when N < Length, Length > 0 ->
	  {?MODULE, whole_body, [Body, Length]};
	N when N >= Length, Length >= 0 ->  
	    %% When a client uses pipelining trailing data
	    %% may be part of the next request!
	    %% Trailing data will be separated from 
	    %% the actual body in body_data/2.
	    {ok, Body}
	end.

%% Prevent people from trying to access directories/files
%% relative to the ServerRoot.
validate_uri(RequestURI) ->
    UriNoQueryNoHex = 
	case string:str(RequestURI, "?") of
	    0 ->
		(catch http_uri:decode(RequestURI));
	    Ndx ->
		(catch http_uri:decode(string:left(RequestURI, Ndx)))
	end,
    case UriNoQueryNoHex of
	{'EXIT', _Reason} ->
	    {error, {bad_request, {malformed_syntax, RequestURI}}};
	_ ->
	    Path  = format_request_uri(UriNoQueryNoHex),
	    Path2 = [X||X<-string:tokens(Path, "/"),X=/="."], %% OTP-5938
	    validate_path(Path2, 0, RequestURI)
    end.

validate_path([], _, _) ->
    ok;
validate_path([".." | _], 0, RequestURI) ->
    {error, {bad_request, {forbidden, RequestURI}}};
validate_path([".." | Rest], N, RequestURI) ->
    validate_path(Rest, N - 1, RequestURI);
validate_path([_ | Rest], N, RequestURI) ->
    validate_path(Rest, N + 1, RequestURI).

validate_version("HTTP/1.1") ->
    true;
validate_version("HTTP/1.0") ->
    true;
validate_version("HTTP/0.9") ->
    true;
validate_version(_) ->
    false.
%%----------------------------------------------------------------------
%% There are 3 possible forms of the reuqest URI 
%%
%%  1. * When the request is not for a special assset. is is instead
%%     to the server itself
%%
%%  2. absoluteURI the whole servername port and asset is in the request
%%
%%  3. The most common form that http/1.0 used abs path that is a path
%%     to the requested asset.
%%----------------------------------------------------------------------
format_request_uri("*")->
    "*";
format_request_uri("http://" ++ ServerAndPath) ->
   remove_server(ServerAndPath);

format_request_uri("HTTP://" ++ ServerAndPath) ->
    remove_server(ServerAndPath);

format_request_uri(ABSPath) ->
    ABSPath.

remove_server([]) ->
    "/";
remove_server([$\/|Url])->
    case Url of
	[]->
	    "/";
        _->
	    [$\/|Url]
    end;
remove_server([_|Url]) ->
    remove_server(Url).

format_absolute_uri("http://"++ Uri, _)->
    "HTTP://" ++ Uri;

format_absolute_uri(OrigUri = "HTTP://" ++ _, _)->
    OrigUri;

format_absolute_uri(Uri,ParsedHeader)->
    case proplists:get_value("host", ParsedHeader) of
	undefined ->
	    nohost;
	Host ->
	    Host++Uri
    end.

get_persistens(HTTPVersion,ParsedHeader,ConfigDB)->
    case httpd_util:lookup(ConfigDB, keep_alive, true) of
	true->
	    case HTTPVersion of
		%%If it is version prio to 1.1 kill the conneciton
		"HTTP/1." ++ NList ->
		    case proplists:get_value("connection", ParsedHeader,
					     "keep-alive") of  
			%%if the connection is not ordered to go down
			%%let it live The keep-alive value is the
			%%older http/1.1 might be older Clients that
			%%use it.
			"keep-alive" when hd(NList) >= 49 ->
			    ?DEBUG("CONNECTION MODE: ~p",[true]),  
			    true;
			"close" ->
			    ?DEBUG("CONNECTION MODE: ~p",[false]),  
			    false;
			_Connect ->
  			    ?DEBUG("CONNECTION MODE: ~p VALUE: ~p",
				   [false, _Connect]),  
			    false
		    end; 
		_ ->
		    ?DEBUG("CONNECTION MODE: ~p VERSION: ~p",
			   [false, HTTPVersion]),  
		    false
	    end;
	_ ->
	    false
    end.

lowest_version()->    
    "HTTP/0.9".

check_header({"content-length", Value}, Maxsizes) ->
    Max = proplists:get_value(max_content_length, Maxsizes),
    MaxLen = length(integer_to_list(Max)),
    case length(Value) =< MaxLen of
	true ->
	    try 
		list_to_integer(Value)
	    of
		I when I>= 0 ->
		    ok;
		_ ->
		    {error, {size_error, Max, 411, "negative content-length"}}
	    catch _:_ ->
		    {error, {size_error, Max, 411, "content-length not an integer"}}
	    end;
	false ->
	    {error, {size_error, Max, 413, "content-length unreasonably long"}}
    end;
check_header(_, _) ->
    ok.