afoserver/http.cpp at master · flyinghead/afoserver · GitHub

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
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
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
//
// Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "http.h"
#include <fstream>
#include <iostream>
#include <strings.h>

namespace status_strings {

const std::string ok =
		"HTTP/1.1 200 OK\r\n";
const std::string created =
		"HTTP/1.1 201 Created\r\n";
const std::string accepted =
		"HTTP/1.1 202 Accepted\r\n";
const std::string no_content =
		"HTTP/1.1 204 No Content\r\n";
const std::string multiple_choices =
		"HTTP/1.1 300 Multiple Choices\r\n";
const std::string moved_permanently =
		"HTTP/1.1 301 Moved Permanently\r\n";
const std::string moved_temporarily =
		"HTTP/1.1 302 Moved Temporarily\r\n";
const std::string not_modified =
		"HTTP/1.1 304 Not Modified\r\n";
const std::string bad_request =
		"HTTP/1.1 400 Bad Request\r\n";
const std::string unauthorized =
		"HTTP/1.1 401 Unauthorized\r\n";
const std::string forbidden =
		"HTTP/1.1 403 Forbidden\r\n";
const std::string not_found =
		"HTTP/1.1 404 Not Found\r\n";
const std::string method_not_allowed =
		"HTTP/1.1 405 Method Not Allowed\r\n";
const std::string internal_server_error =
		"HTTP/1.1 500 Internal Server Error\r\n";
const std::string not_implemented =
		"HTTP/1.1 501 Not Implemented\r\n";
const std::string bad_gateway =
		"HTTP/1.1 502 Bad Gateway\r\n";
const std::string service_unavailable =
		"HTTP/1.1 503 Service Unavailable\r\n";

asio::const_buffer toBuffer(Reply::status_type status)
{
	switch (status)
	{
	case Reply::ok:
		return asio::buffer(ok);
	case Reply::created:
		return asio::buffer(created);
	case Reply::accepted:
		return asio::buffer(accepted);
	case Reply::no_content:
		return asio::buffer(no_content);
	case Reply::multiple_choices:
		return asio::buffer(multiple_choices);
	case Reply::moved_permanently:
		return asio::buffer(moved_permanently);
	case Reply::moved_temporarily:
		return asio::buffer(moved_temporarily);
	case Reply::not_modified:
		return asio::buffer(not_modified);
	case Reply::bad_request:
		return asio::buffer(bad_request);
	case Reply::unauthorized:
		return asio::buffer(unauthorized);
	case Reply::forbidden:
		return asio::buffer(forbidden);
	case Reply::not_found:
		return asio::buffer(not_found);
	case Reply::method_not_allowed:
		return asio::buffer(method_not_allowed);
	case Reply::internal_server_error:
		return asio::buffer(internal_server_error);
	case Reply::not_implemented:
		return asio::buffer(not_implemented);
	case Reply::bad_gateway:
		return asio::buffer(bad_gateway);
	case Reply::service_unavailable:
		return asio::buffer(service_unavailable);
	default:
		return asio::buffer(internal_server_error);
	}
}

} // namespace status_strings

namespace misc_strings {

const char name_value_separator[] = { ':', ' ' };
const char crlf[] = { '\r', '\n' };

} // namespace misc_strings

std::vector<asio::const_buffer> Reply::toBuffers()
{
	std::vector<asio::const_buffer> buffers;
	buffers.push_back(status_strings::toBuffer(status));
	for (std::size_t i = 0; i < headers.size(); ++i)
	{
		Header& h = headers[i];
		buffers.push_back(asio::buffer(h.name));
		buffers.push_back(asio::buffer(misc_strings::name_value_separator));
		buffers.push_back(asio::buffer(h.value));
		buffers.push_back(asio::buffer(misc_strings::crlf));
	}
	buffers.push_back(asio::buffer(misc_strings::crlf));
	buffers.push_back(asio::buffer(content));
	return buffers;
}

std::string Reply::to_string()
{
	std::string s;
	std::vector<asio::const_buffer> buffers = toBuffers();
	for (const asio::const_buffer& buffer : buffers)
	{
		size_t sz = asio::buffer_size(buffer);
		const char *p = asio::buffer_cast<const char*>(buffer);
		s += std::string(p, p + sz);
	}
	return s;
}

namespace stock_replies {

const char ok[] = "";
const char created[] =
		"<html>"
		"<head><title>Created</title></head>"
		"<body><h1>201 Created</h1></body>"
		"</html>";
const char accepted[] =
		"<html>"
		"<head><title>Accepted</title></head>"
		"<body><h1>202 Accepted</h1></body>"
		"</html>";
const char no_content[] =
		"<html>"
		"<head><title>No Content</title></head>"
		"<body><h1>204 Content</h1></body>"
		"</html>";
const char multiple_choices[] =
		"<html>"
		"<head><title>Multiple Choices</title></head>"
		"<body><h1>300 Multiple Choices</h1></body>"
		"</html>";
const char moved_permanently[] =
		"<html>"
		"<head><title>Moved Permanently</title></head>"
		"<body><h1>301 Moved Permanently</h1></body>"
		"</html>";
const char moved_temporarily[] =
		"<html>"
		"<head><title>Moved Temporarily</title></head>"
		"<body><h1>302 Moved Temporarily</h1></body>"
		"</html>";
const char not_modified[] =
		"<html>"
		"<head><title>Not Modified</title></head>"
		"<body><h1>304 Not Modified</h1></body>"
		"</html>";
const char bad_request[] =
		"<html>"
		"<head><title>Bad Request</title></head>"
		"<body><h1>400 Bad Request</h1></body>"
		"</html>";
const char unauthorized[] =
		"<html>"
		"<head><title>Unauthorized</title></head>"
		"<body><h1>401 Unauthorized</h1></body>"
		"</html>";
const char forbidden[] =
		"<html>"
		"<head><title>Forbidden</title></head>"
		"<body><h1>403 Forbidden</h1></body>"
		"</html>";
const char not_found[] =
		"<html>"
		"<head><title>Not Found</title></head>"
		"<body><h1>404 Not Found</h1></body>"
		"</html>";
const char method_not_allowed[] =
		"<html>"
		"<head><title>Method Not Allowed</title></head>"
		"<body><h1>405 Method Not Allowed</h1></body>"
		"</html>";
const char internal_server_error[] =
		"<html>"
		"<head><title>Internal Server Error</title></head>"
		"<body><h1>500 Internal Server Error</h1></body>"
		"</html>";
const char not_implemented[] =
		"<html>"
		"<head><title>Not Implemented</title></head>"
		"<body><h1>501 Not Implemented</h1></body>"
		"</html>";
const char bad_gateway[] =
		"<html>"
		"<head><title>Bad Gateway</title></head>"
		"<body><h1>502 Bad Gateway</h1></body>"
		"</html>";
const char service_unavailable[] =
		"<html>"
		"<head><title>Service Unavailable</title></head>"
		"<body><h1>503 Service Unavailable</h1></body>"
		"</html>";

std::string to_string(Reply::status_type status)
{
	switch (status)
	{
	case Reply::ok:
		return ok;
	case Reply::created:
		return created;
	case Reply::accepted:
		return accepted;
	case Reply::no_content:
		return no_content;
	case Reply::multiple_choices:
		return multiple_choices;
	case Reply::moved_permanently:
		return moved_permanently;
	case Reply::moved_temporarily:
		return moved_temporarily;
	case Reply::not_modified:
		return not_modified;
	case Reply::bad_request:
		return bad_request;
	case Reply::unauthorized:
		return unauthorized;
	case Reply::forbidden:
		return forbidden;
	case Reply::not_found:
		return not_found;
	case Reply::method_not_allowed:
		return method_not_allowed;
	case Reply::internal_server_error:
		return internal_server_error;
	case Reply::not_implemented:
		return not_implemented;
	case Reply::bad_gateway:
		return bad_gateway;
	case Reply::service_unavailable:
		return service_unavailable;
	default:
		return internal_server_error;
	}
}

} // namespace stock_replies

Reply Reply::stockReply(Reply::status_type status)
{
	Reply rep;
	rep.setContent(stock_replies::to_string(status), "text/html");
	rep.status = status;
	return rep;
}

void Reply::setContent(const std::string& content, const std::string& mimeType)
{
	this->content = content;
	addHeader("Content-Length", std::to_string(content.size()));
	addHeader("Content-Type", mimeType);
	status = ok;
}

void RequestHandler::handleRequest(const Request& req, Reply& rep)
{
	// Decode url to path.
	std::string request_path;
	if (!urlDecode(req.uri, request_path))
	{
		rep = Reply::stockReply(Reply::bad_request);
		return;
	}

	// Request path must be absolute and not contain "..".
	if (request_path.empty() || request_path[0] != '/'
			|| request_path.find("..") != std::string::npos)
	{
		rep = Reply::stockReply(Reply::bad_request);
		return;
	}

	// If path starts with /cgi-bin/ then call the corresponding handler
	if (request_path.substr(0, 9) == "/cgi-bin/")
	{
		std::size_t qm_pos = request_path.find('?');
		if (qm_pos == std::string::npos)
			qm_pos = request_path.length();
		auto it = cgiHandlers.find(request_path.substr(9, qm_pos - 9));
		if (it != cgiHandlers.end()) {
			it->second(req, rep);
			return;
		}
	}
	rep = Reply::stockReply(Reply::not_found);
	return;
}

bool RequestHandler::urlDecode(const std::string& in, std::string& out)
{
	out.clear();
	out.reserve(in.size());
	for (std::size_t i = 0; i < in.size(); ++i)
	{
		if (in[i] == '%')
		{
			if (i + 3 <= in.size())
			{
				int value = 0;
				std::istringstream is(in.substr(i + 1, 2));
				if (is >> std::hex >> value)
				{
					out += static_cast<char>(value);
					i += 2;
				}
				else
				{
					return false;
				}
			}
			else
			{
				return false;
			}
		}
		else if (in[i] == '+')
		{
			out += ' ';
		}
		else
		{
			out += in[i];
		}
	}
	return true;
}

RequestParser::result_type RequestParser::consume(Request& req, char input)
{
	if (state != reading_content && ++headLength > MAX_HEAD_LEN)
		return bad;
	switch (state)
	{
	case method_start:
		if (!isChar(input) || isCtl(input) || isTSpecial(input))
		{
			return bad;
		}
		else
		{
			state = method;
			req.method.push_back(input);
			return indeterminate;
		}
	case method:
		if (input == ' ')
		{
			state = uri;
			return indeterminate;
		}
		else if (!isChar(input) || isCtl(input) || isTSpecial(input))
		{
			return bad;
		}
		else
		{
			req.method.push_back(input);
			return indeterminate;
		}
	case uri:
		if (input == ' ')
		{
			state = http_version_h;
			return indeterminate;
		}
		else if (isCtl(input))
		{
			return bad;
		}
		else
		{
			req.uri.push_back(input);
			return indeterminate;
		}
	case http_version_h:
		if (input == 'H')
		{
			state = http_version_t_1;
			return indeterminate;
		}
		else
		{
			return bad;
		}
	case http_version_t_1:
		if (input == 'T')
		{
			state = http_version_t_2;
			return indeterminate;
		}
		else
		{
			return bad;
		}
	case http_version_t_2:
		if (input == 'T')
		{
			state = http_version_p;
			return indeterminate;
		}
		else
		{
			return bad;
		}
	case http_version_p:
		if (input == 'P')
		{
			state = http_version_slash;
			return indeterminate;
		}
		else
		{
			return bad;
		}
	case http_version_slash:
		if (input == '/')
		{
			req.http_version_minor = 0;
			state = http_version_major_start;
			return indeterminate;
		}
		else
		{
			return bad;
		}
	case http_version_major_start:
		if (isDigit(input))
		{
			if (input != '1')
				return bad;
			state = http_version_major;
			return indeterminate;
		}
		else
		{
			return bad;
		}
	case http_version_major:
		if (input == '.')
		{
			state = http_version_minor_start;
			return indeterminate;
		}
		else
		{
			return bad;
		}
	case http_version_minor_start:
		if (isDigit(input))
		{
			req.http_version_minor = input - '0';
			state = http_version_minor;
			return indeterminate;
		}
		else
		{
			return bad;
		}
	case http_version_minor:
		if (input == '\r')
		{
			state = expecting_newline_1;
			return indeterminate;
		}
		else {
			return bad;
		}
	case expecting_newline_1:
		if (input == '\n')
		{
			state = header_line_start;
			return indeterminate;
		}
		else
		{
			return bad;
		}
	case header_line_start:
		if (input == '\r')
		{
			state = expecting_newline_3;
			return indeterminate;
		}
		else if (!req.headers.empty() && (input == ' ' || input == '\t'))
		{
			state = header_lws;
			return indeterminate;
		}
		else if (!isChar(input) || isCtl(input) || isTSpecial(input))
		{
			return bad;
		}
		else
		{
			req.headers.push_back(Header());
			req.headers.back().name.push_back(input);
			state = header_name;
			return indeterminate;
		}
	case header_lws:
		if (input == '\r')
		{
			state = expecting_newline_2;
			return indeterminate;
		}
		else if (input == ' ' || input == '\t')
		{
			return indeterminate;
		}
		else if (isCtl(input))
		{
			return bad;
		}
		else
		{
			state = header_value;
			req.headers.back().value.push_back(input);
			return indeterminate;
		}
	case header_name:
		if (input == ':')
		{
			state = space_before_header_value;
			return indeterminate;
		}
		else if (!isChar(input) || isCtl(input) || isTSpecial(input))
		{
			return bad;
		}
		else
		{
			req.headers.back().name.push_back(input);
			return indeterminate;
		}
	case space_before_header_value:
		if (input == ' ')
		{
			state = header_value;
			return indeterminate;
		}
		else
		{
			return bad;
		}
	case header_value:
		if (input == '\r')
		{
			state = expecting_newline_2;
			return indeterminate;
		}
		else if (isCtl(input))
		{
			return bad;
		}
		else
		{
			req.headers.back().value.push_back(input);
			return indeterminate;
		}
	case expecting_newline_2:
		if (input == '\n')
		{
			state = header_line_start;
			return indeterminate;
		}
		else
		{
			return bad;
		}
	case expecting_newline_3:
		if (input == '\n')
		{
			if (req.method == "POST")
			{
				state = reading_content;
				contentLength = 0;
				for (const Header& header : req.headers)
				{
					if (!strcasecmp(header.name.c_str(), "Content-Length"))
					{
						contentLength = std::atol(header.value.c_str());
						if (contentLength > MAX_BODY_LEN)
							return bad;
						break;
					}
				}

				return indeterminate;
			}
			else {
				return good;
			}
		}
		else {
			return bad;
		}
	case reading_content:
		req.content.push_back(input);
		if (req.content.size() > MAX_BODY_LEN)
			return bad;
		else if (req.content.size() == contentLength)
			return good;
		else
			return indeterminate;
	default:
		return bad;
	}
}

bool RequestParser::isTSpecial(int c)
{
	switch (c)
	{
	case '(': case ')': case '<': case '>': case '@':
	case ',': case ';': case ':': case '\\': case '"':
	case '/': case '[': case ']': case '?': case '=':
	case '{': case '}': case ' ': case '\t':
		return true;
	default:
		return false;
	}
}

Connection::Connection(asio::ip::tcp::socket socket,
		ConnectionManager& manager, RequestHandler& handler)
	: socket(std::move(socket)), connectionManager(manager), requestHandler(handler),
	  timeoutTimer(socket.get_executor())
{
}

void Connection::doRead()
{
	auto self(shared_from_this());
	socket.async_read_some(asio::buffer(buffer),
		[this, self](std::error_code ec, std::size_t bytes_transferred)
		{
			if (!ec)
			{
				RequestParser::result_type result;
				std::tie(result, std::ignore) = requestParser.parse(
						request, buffer.data(), buffer.data() + bytes_transferred);

				if (result == RequestParser::good)
				{
					requestHandler.handleRequest(request, reply);
					reply.addHeader("Connection", "close");
					doWrite();
				}
				else if (result == RequestParser::bad)
				{
					reply = Reply::stockReply(Reply::bad_request);
					reply.addHeader("Connection", "close");
					doWrite();
				}
				else {
					doRead();
				}
			}
			else if (ec != asio::error::operation_aborted) {
				connectionManager.stop(shared_from_this());
			}
		});
}

void Connection::doWrite()
{
	auto self(shared_from_this());
	asio::async_write(socket, reply.toBuffers(),
		[this, self](std::error_code ec, std::size_t)
		{
			if (!ec)
			{
				if (!keepAlive)
				{
					// Initiate graceful connection closure.
					std::error_code ignored_ec;
					socket.shutdown(asio::ip::tcp::socket::shutdown_both,
							ignored_ec);
				}
				else
				{
					keepAlive = false;
					request = {};
					reply = {};
					startTimer();
					doRead();
				}
			}

			if (ec != asio::error::operation_aborted)
				connectionManager.stop(shared_from_this());
		});
}

void Connection::startTimer()
{
	timeoutTimer.expires_after(asio::chrono::seconds(30));
	timeoutTimer.async_wait([self = shared_from_this()](const std::error_code& ec) {
		if (!ec)
		{
			std::error_code ignored;
			self->socket.shutdown(asio::ip::tcp::socket::shutdown_both, ignored);
			self->connectionManager.stop(self);
		}
	});

}

void ConnectionManager::start(Connection::Ptr c) {
	connections.insert(c);
	c->start();
}

void ConnectionManager::stop(Connection::Ptr c) {
	connections.erase(c);
	c->stop();
}

void ConnectionManager::stopAll()
{
	for (auto c: connections)
		c->stop();
	connections.clear();
}

HttpServer::HttpServer(asio::io_context& io_context, const std::string& address, uint16_t port)
  : io_context(io_context),
    acceptor(io_context),
    connectionManager(),
    requestHandler()
{
	// Open the acceptor with the option to reuse the address (i.e. SO_REUSEADDR).
	asio::ip::tcp::resolver resolver(io_context);
	asio::ip::tcp::endpoint endpoint = *resolver.resolve(address, std::to_string(port)).begin();
	acceptor.open(endpoint.protocol());
	acceptor.set_option(asio::ip::tcp::acceptor::reuse_address(true));
	acceptor.bind(endpoint);
	acceptor.listen();

	doAccept();
}

void HttpServer::doAccept()
{
	acceptor.async_accept(
		[this](std::error_code ec, asio::ip::tcp::socket socket)
		{
			// Check whether the server was stopped by a signal before this
			// completion handler had a chance to run.
			if (!acceptor.is_open())
			  return;

			if (!ec) {
			  connectionManager.start(std::make_shared<Connection>(
				  std::move(socket), connectionManager, requestHandler));
			}

			doAccept();
		});
}