summaryrefslogtreecommitdiff
path: root/test/interactive-helper/aptwebserver.cc
blob: 0398a12b6fb244ea2781b0b7f4553354bdb18bfa (plain)
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
782
783
784
785
786
787
788
789
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
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
#include <config.h>

#include <apt-pkg/cmndline.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/strutl.h>

#include "teestream.h"

#include <dirent.h>
#include <errno.h>
#include <netinet/in.h>
#include <regex.h>
#include <signal.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>

#include <algorithm>
#include <fstream>
#include <iostream>
#include <list>
#include <sstream>
#include <string>
#include <thread>
#include <unordered_map>
#include <vector>

static std::string HTMLEncode(std::string encode)			/*{{{*/
{
   constexpr std::array<std::array<char const *,2>,6> htmlencode = {{
      {{ "&", "&amp;" }},
      {{ "<", "&lt;" }},
      {{ ">", "&gt;" }},
      {{ "\"", "&quot;" }},
      {{ "'", "&#x27;" }},
      {{ "/", "&#x2F;" }},
   }};
   for (auto &&h: htmlencode)
      encode = SubstVar(encode, h[0], h[1]);
   return encode;
}
									/*}}}*/
static std::string httpcodeToStr(int const httpcode)			/*{{{*/
{
   switch (httpcode)
   {
      // Informational 1xx
      case 100: return _config->Find("aptwebserver::httpcode::100", "100 Continue");
      case 101: return _config->Find("aptwebserver::httpcode::101", "101 Switching Protocols");
      // Successful 2xx
      case 200: return _config->Find("aptwebserver::httpcode::200", "200 OK");
      case 201: return _config->Find("aptwebserver::httpcode::201", "201 Created");
      case 202: return _config->Find("aptwebserver::httpcode::202", "202 Accepted");
      case 203: return _config->Find("aptwebserver::httpcode::203", "203 Non-Authoritative Information");
      case 204: return _config->Find("aptwebserver::httpcode::204", "204 No Content");
      case 205: return _config->Find("aptwebserver::httpcode::205", "205 Reset Content");
      case 206: return _config->Find("aptwebserver::httpcode::206", "206 Partial Content");
      // Redirections 3xx
      case 300: return _config->Find("aptwebserver::httpcode::300", "300 Multiple Choices");
      case 301: return _config->Find("aptwebserver::httpcode::301", "301 Moved Permanently");
      case 302: return _config->Find("aptwebserver::httpcode::302", "302 Found");
      case 303: return _config->Find("aptwebserver::httpcode::303", "303 See Other");
      case 304: return _config->Find("aptwebserver::httpcode::304", "304 Not Modified");
      case 305: return _config->Find("aptwebserver::httpcode::305", "305 Use Proxy");
      case 307: return _config->Find("aptwebserver::httpcode::307", "307 Temporary Redirect");
      case 308: return _config->Find("aptwebserver::httpcode::308", "308 Permanent Redirect");
      // Client errors 4xx
      case 400: return _config->Find("aptwebserver::httpcode::400", "400 Bad Request");
      case 401: return _config->Find("aptwebserver::httpcode::401", "401 Unauthorized");
      case 402: return _config->Find("aptwebserver::httpcode::402", "402 Payment Required");
      case 403: return _config->Find("aptwebserver::httpcode::403", "403 Forbidden");
      case 404: return _config->Find("aptwebserver::httpcode::404", "404 Not Found");
      case 405: return _config->Find("aptwebserver::httpcode::405", "405 Method Not Allowed");
      case 406: return _config->Find("aptwebserver::httpcode::406", "406 Not Acceptable");
      case 407: return _config->Find("aptwebserver::httpcode::407", "407 Proxy Authentication Required");
      case 408: return _config->Find("aptwebserver::httpcode::408", "408 Request Time-out");
      case 409: return _config->Find("aptwebserver::httpcode::409", "409 Conflict");
      case 410: return _config->Find("aptwebserver::httpcode::410", "410 Gone");
      case 411: return _config->Find("aptwebserver::httpcode::411", "411 Length Required");
      case 412: return _config->Find("aptwebserver::httpcode::412", "412 Precondition Failed");
      case 413: return _config->Find("aptwebserver::httpcode::413", "413 Request Entity Too Large");
      case 414: return _config->Find("aptwebserver::httpcode::414", "414 Request-URI Too Large");
      case 415: return _config->Find("aptwebserver::httpcode::415", "415 Unsupported Media Type");
      case 416: return _config->Find("aptwebserver::httpcode::416", "416 Requested range not satisfiable");
      case 417: return _config->Find("aptwebserver::httpcode::417", "417 Expectation Failed");
      case 418: return _config->Find("aptwebserver::httpcode::418", "418 I'm a teapot");
      // Server error 5xx
      case 500: return _config->Find("aptwebserver::httpcode::500", "500 Internal Server Error");
      case 501: return _config->Find("aptwebserver::httpcode::501", "501 Not Implemented");
      case 502: return _config->Find("aptwebserver::httpcode::502", "502 Bad Gateway");
      case 503: return _config->Find("aptwebserver::httpcode::503", "503 Service Unavailable");
      case 504: return _config->Find("aptwebserver::httpcode::504", "504 Gateway Time-out");
      case 505: return _config->Find("aptwebserver::httpcode::505", "505 HTTP Version not supported");
   }
   std::string codeconf, code;
   strprintf(codeconf, "aptwebserver::httpcode::%i", httpcode);
   strprintf(code, "%i Unknown HTTP code", httpcode);
   return _config->Find(codeconf, code);
}
									/*}}}*/
static bool chunkedTransferEncoding(std::list<std::string> const &headers)/*{{{*/
{
   if (std::find(headers.begin(), headers.end(), "Transfer-Encoding: chunked") != headers.end())
      return true;
   if (_config->FindB("aptwebserver::chunked-transfer-encoding", false) == true)
      return true;
   return false;
}
									/*}}}*/
static bool contentTypeSet(std::list<std::string> const &headers)	/*{{{*/
{
   return std::any_of(headers.begin(), headers.end(), [](std::string const &h) { return APT::String::Startswith(h, "Content-Type:"); });
}
									/*}}}*/
// contentTypeFromExtension						/*{{{*/
static std::string contentTypeFromExtension(std::string const &ext)
{
   auto t = _config->Find(std::string("aptwebserver::content-type::by-extension::").append(ext));
   if (APT::String::Startswith(t, "text/"))
      return t.append("; charset=utf-8");
   return t;
}
									/*}}}*/
static void addFileHeaders(std::list<std::string> &headers, FileFd &data)/*{{{*/
{
   if (chunkedTransferEncoding(headers) == false)
   {
      std::ostringstream contentlength;
      contentlength << "Content-Length: " << data.FileSize();
      headers.push_back(contentlength.str());
   }
   if (_config->FindB("aptwebserver::support::last-modified", true) == true)
   {
      std::string lastmodified("Last-Modified: ");
      lastmodified.append(TimeRFC1123(data.ModificationTime(), false));
      headers.push_back(lastmodified);
   }
   if (_config->FindB("aptwebserver::content-type::guess", true) &&
       data.FileSize() != 0 &&
       contentTypeSet(headers) == false)
   {
      std::string const name = data.Name();
      std::string ext = flExtension(name);
      if (name.empty() == false && ext.empty() == false && name != ext)
      {
	 std::transform(ext.begin(), ext.end(), ext.begin(), ::tolower);
	 auto const type = contentTypeFromExtension(ext);
	 if (type.empty() == false)
	    headers.push_back(std::string("Content-Type: ").append(type));
      }
   }
}
									/*}}}*/
static void addDataHeaders(std::list<std::string> &headers, std::string &data)/*{{{*/
{
   if (chunkedTransferEncoding(headers) == false)
   {
      std::ostringstream contentlength;
      contentlength << "Content-Length: " << data.size();
      headers.push_back(contentlength.str());
   }
}
									/*}}}*/
static bool sendHead(std::ostream &log, int const client, int const httpcode, std::list<std::string> &headers)/*{{{*/
{
   std::string response("HTTP/1.1 ");
   response.append(httpcodeToStr(httpcode));
   headers.push_front(response);
   _config->Set("APTWebserver::Last-Status-Code", httpcode);

   std::stringstream buffer;
   auto const empties = _config->FindVector("aptwebserver::empty-response-header");
   for (auto const &e: empties)
      buffer << e << ":" << std::endl;
   _config->Dump(buffer, "aptwebserver::response-header", "%t: %v%n", false);
   std::vector<std::string> addheaders = VectorizeString(buffer.str(), '\n');
   for (std::vector<std::string>::const_iterator h = addheaders.begin(); h != addheaders.end(); ++h)
      headers.push_back(*h);

   std::string date("Date: ");
   date.append(TimeRFC1123(time(NULL), false));
   headers.push_back(date);

   if (chunkedTransferEncoding(headers) == true)
      headers.push_back("Transfer-Encoding: chunked");

   log << ">>> RESPONSE to " << client << " >>>" << std::endl;
   bool Success = true;
   for (std::list<std::string>::const_iterator h = headers.begin();
	Success == true && h != headers.end(); ++h)
   {
      Success &= FileFd::Write(client, h->c_str(), h->size());
      if (Success == true)
	 Success &= FileFd::Write(client, "\r\n", 2);
      log << *h << std::endl;
   }
   if (Success == true)
      Success &= FileFd::Write(client, "\r\n", 2);
   log << "<<<<<<<<<<<<<<<<" << std::endl;
   return Success;
}
									/*}}}*/
static bool sendFile(int const client, std::list<std::string> const &headers, FileFd &data)/*{{{*/
{
   bool Success = true;
   bool const chunked = chunkedTransferEncoding(headers);
   char buffer[500];
   unsigned long long actual = 0;
   while ((Success &= data.Read(buffer, sizeof(buffer), &actual)) == true)
   {
      if (actual == 0)
	 break;

      if (chunked == true)
      {
	 std::string size;
	 strprintf(size, "%llX\r\n", actual);
	 Success &= FileFd::Write(client, size.c_str(), size.size());
	 Success &= FileFd::Write(client, buffer, actual);
	 Success &= FileFd::Write(client, "\r\n", strlen("\r\n"));
      }
      else
	 Success &= FileFd::Write(client, buffer, actual);
   }
   if (chunked == true)
   {
      char const * const finish = "0\r\n\r\n";
      Success &= FileFd::Write(client, finish, strlen(finish));
   }
   if (Success == false)
      std::cerr << "SENDFILE:" << (chunked ? " CHUNKED" : "") << " READ/WRITE ERROR to " << client << std::endl;
   return Success;
}
									/*}}}*/
static bool sendData(int const client, std::list<std::string> const &headers, std::string const &data)/*{{{*/
{
   if (chunkedTransferEncoding(headers) == true)
   {
      unsigned long long const ullsize = data.length();
      std::string size;
      strprintf(size, "%llX\r\n", ullsize);
      char const * const finish = "\r\n0\r\n\r\n";
      if (FileFd::Write(client, size.c_str(), size.length()) == false ||
	    FileFd::Write(client, data.c_str(), ullsize) == false ||
	    FileFd::Write(client, finish, strlen(finish)) == false)
      {
	 std::cerr << "SENDDATA: CHUNK WRITE ERROR to " << client << std::endl;
	 return false;
      }
   }
   else if (FileFd::Write(client, data.c_str(), data.size()) == false)
   {
      std::cerr << "SENDDATA: WRITE ERROR to " << client << std::endl;
      return false;
   }
   return true;
}
									/*}}}*/
static void sendError(std::ostream &log, int const client, int const httpcode, std::string const &request,/*{{{*/
	       bool const content, std::string const &error, std::list<std::string> &headers)
{
   auto const quotedCode = HTMLEncode(httpcodeToStr(httpcode));
   std::string response("<!doctype html><html><head><title>");
   response.append(quotedCode).append("</title><meta charset=\"utf-8\" /></head>");
   response.append("<body><h1>").append(quotedCode).append("</h1>");
   if (httpcode != 200)
      response.append("<p><em>Error</em>: ");
   else
      response.append("<p><em>Success</em>: ");
   if (error.empty() == false)
      response.append(HTMLEncode(error));
   else
      response.append(quotedCode);
   if (httpcode != 200)
      response.append("</p>This error is a result of the request: <pre>");
   else
      response.append("The successfully executed operation was requested by: <pre>");
   response.append(HTMLEncode(request)).append("</pre></body></html>");
   if (httpcode != 200)
   {
      if (_config->FindB("aptwebserver::closeOnError", false) == true)
	 headers.push_back("Connection: close");
   }
   addDataHeaders(headers, response);

   if (contentTypeSet(headers) == false)
      headers.push_back("Content-Type: text/html; charset=utf-8");

   sendHead(log, client, httpcode, headers);
   if (content == true)
      sendData(client, headers, response);
}
static void sendSuccess(std::ostream &log, int const client, std::string const &request,
	       bool const content, std::string const &error, std::list<std::string> &headers)
{
   sendError(log, client, 200, request, content, error, headers);
}
									/*}}}*/
static void sendRedirect(std::ostream &log, int const client, int const httpcode,/*{{{*/
		  std::string const &uri, std::string const &request, bool content)
{
   std::list<std::string> headers;
   auto const quotedCode = HTMLEncode(httpcodeToStr(httpcode));
   std::string response("<!doctype html><html><head><title>");
   response.append(quotedCode).append("</title><meta charset=\"utf-8\" /></head>");
   response.append("<body><h1>").append(quotedCode).append("</h1");
   response.append("<p>You should be redirected to <em>").append(HTMLEncode(uri)).append("</em></p>");
   response.append("This page is a result of the request: <pre>");
   response.append(HTMLEncode(request)).append("</pre></body></html>");
   addDataHeaders(headers, response);
   std::string location("Location: ");
   if (strncmp(uri.c_str(), "http://", 7) != 0 && strncmp(uri.c_str(), "https://", 8) != 0)
   {
      std::string const host = LookupTag(request, "Host");
      unsigned int const httpsport = _config->FindI("aptwebserver::port::https", 4433);
      std::string hosthttpsport;
      strprintf(hosthttpsport, ":%u", httpsport);
      if (host.find(hosthttpsport) != std::string::npos)
	 location.append("https://");
      else
	 location.append("http://");
      location.append(host).append("/");
      if (strncmp("/home/", uri.c_str(), strlen("/home/")) == 0 && uri.find("/public_html/") != std::string::npos)
      {
	 std::string homeuri = SubstVar(uri, "/home/", "~");
	 homeuri = SubstVar(homeuri, "/public_html/", "/");
	 location.append(homeuri);
      }
      else
	 location.append(uri);
   }
   else
      location.append(uri);
   headers.push_back(location);

   if (contentTypeSet(headers) == false)
      headers.push_back("Content-Type: text/html; charset=utf-8");

   sendHead(log, client, httpcode, headers);
   if (content == true)
      sendData(client, headers, response);
}
									/*}}}*/
static int filter_hidden_files(const struct dirent *a)			/*{{{*/
{
   if (a->d_name[0] == '.')
      return 0;
#ifdef _DIRENT_HAVE_D_TYPE
   // if we have the d_type check that only files and dirs will be included
   if (a->d_type != DT_UNKNOWN &&
       a->d_type != DT_REG &&
       a->d_type != DT_LNK && // this includes links to regular files
       a->d_type != DT_DIR)
      return 0;
#endif
   return 1;
}
static int grouped_alpha_case_sort(const struct dirent **a, const struct dirent **b) {
#ifdef _DIRENT_HAVE_D_TYPE
   if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_DIR);
   else if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_REG)
      return -1;
   else if ((*b)->d_type == DT_DIR && (*a)->d_type == DT_REG)
      return 1;
   else
#endif
   {
      struct stat f_prop; //File's property
      stat((*a)->d_name, &f_prop);
      int const amode = f_prop.st_mode;
      stat((*b)->d_name, &f_prop);
      int const bmode = f_prop.st_mode;
      if (S_ISDIR(amode) && S_ISDIR(bmode));
      else if (S_ISDIR(amode))
	 return -1;
      else if (S_ISDIR(bmode))
	 return 1;
   }
   return strcasecmp((*a)->d_name, (*b)->d_name);
}
									/*}}}*/
static void sendDirectoryListing(std::ostream &log, int const client, std::string const &dir,/*{{{*/
			  std::string const &request, bool content, std::list<std::string> &headers)
{
   struct dirent **namelist;
   int const counter = scandir(dir.c_str(), &namelist, filter_hidden_files, grouped_alpha_case_sort);
   if (counter == -1)
   {
      sendError(log, client, 500, request, content, "scandir failed", headers);
      return;
   }

   std::ostringstream listing;
   std::string const quotedDir = HTMLEncode(dir);
   listing << "<!doctype html><html><head><title>Index of " << quotedDir << "</title><meta charset=\"utf-8\" />"
	   << "<style type=\"text/css\"><!-- td {padding: 0.02em 0.5em 0.02em 0.5em;}"
	   << "tr:nth-child(even){background-color:#dfdfdf;}"
	   << "h1, td:nth-child(3){text-align:center;}"
	   << "table {margin-left:auto;margin-right:auto;} --></style>"
	   << "</head>" << std::endl
	   << "<body><h1>Index of " << quotedDir << "</h1>" << std::endl
	   << "<table><tr><th>#</th><th>Name</th><th>Size</th><th>Last-Modified</th></tr>" << std::endl;
   if (dir != "./")
      listing << "<tr><td>d</td><td><a href=\"..\">Parent Directory</a></td><td>-</td><td>-</td></tr>";
   for (int i = 0; i < counter; ++i) {
      struct stat fs;
      std::string filename(dir);
      filename.append("/").append(namelist[i]->d_name);
      stat(filename.c_str(), &fs);
      std::string const quotedHref = QuoteString(namelist[i]->d_name, "\"\\/#?");
      std::string const quotedName = HTMLEncode(namelist[i]->d_name);
      bool const isDir = S_ISDIR(fs.st_mode);
      listing << "<tr><td>" << (isDir ? 'd' : 'f') << "</td>"
	 << "<td><a href=\"./" << quotedHref << (isDir ? "/" : "") <<"\">" << quotedName << "</a></td>"
	 << "<td>" << (isDir ? "-" : SizeToStr(fs.st_size).append("B")) << "</td>"
	 << "<td>" << TimeRFC1123(fs.st_mtime, true) << "</td></tr>\n";
   }
   listing << "</table></body></html>" << std::endl;

   if (contentTypeSet(headers) == false)
      headers.push_back("Content-Type: text/html; charset=utf-8");

   std::string response(listing.str());
   addDataHeaders(headers, response);
   sendHead(log, client, 200, headers);
   if (content == true)
      sendData(client, headers, response);
}
									/*}}}*/
static bool parseFirstLine(std::ostream &log, int const client, std::string const &request,/*{{{*/
		    std::string &filename, std::string &params, bool &sendContent,
		    bool &closeConnection, std::list<std::string> &headers)
{
   if (strncmp(request.c_str(), "HEAD ", 5) == 0)
      sendContent = false;
   if (strncmp(request.c_str(), "GET ", 4) != 0)
   {
      sendError(log, client, 501, request, true, "", headers);
      return false;
   }

   size_t const lineend = request.find('\n');
   size_t filestart = request.find(' ');
   for (; request[filestart] == ' '; ++filestart);
   size_t fileend = request.rfind(' ', lineend);
   if (lineend == std::string::npos || filestart == std::string::npos ||
	 fileend == std::string::npos || filestart == fileend)
   {
      sendError(log, client, 500, request, sendContent, "Filename can't be extracted", headers);
      return false;
   }

   size_t httpstart = fileend;
   for (; request[httpstart] == ' '; ++httpstart);
   if (strncmp(request.c_str() + httpstart, "HTTP/1.1\r", 9) == 0)
      closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "Keep-Alive") != 0;
   else if (strncmp(request.c_str() + httpstart, "HTTP/1.0\r", 9) == 0)
      closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "close") == 0;
   else
   {
      sendError(log, client, 500, request, sendContent, "Not an HTTP/1.{0,1} request", headers);
      return false;
   }

   filename = request.substr(filestart, fileend - filestart);
   if (filename.find(' ') != std::string::npos)
   {
      sendError(log, client, 500, request, sendContent, "Filename contains an unencoded space", headers);
      return false;
   }

   std::string host = LookupTag(request, "Host", "");
   if (host.empty() == true)
   {
      // RFC 2616 §14.23 requires Host
      sendError(log, client, 400, request, sendContent, "Host header is required", headers);
      return false;
   }
   host = "http://" + host;

   // Proxies require absolute uris, so this is a simple proxy-fake option
   std::string const absolute = _config->Find("aptwebserver::request::absolute", "uri,path");
   if (strncmp(host.c_str(), filename.c_str(), host.length()) == 0 && APT::String::Startswith(filename, "/_config/") == false)
   {
      if (absolute.find("uri") == std::string::npos)
      {
	 sendError(log, client, 400, request, sendContent, "Request is absoluteURI, but configured to not accept that", headers);
	 return false;
      }

      // strip the host from the request to make it an absolute path
      filename.erase(0, host.length());

      std::string const authConf = _config->Find("aptwebserver::proxy-authorization", "");
      std::string auth = LookupTag(request, "Proxy-Authorization", "");
      if (authConf.empty() != auth.empty())
      {
	 if (auth.empty())
	    sendError(log, client, 407, request, sendContent, "Proxy requires authentication", headers);
	 else
	    sendError(log, client, 407, request, sendContent, "Client wants to authenticate to proxy, but proxy doesn't need it", headers);
	return false;
      }
      if (authConf.empty() == false)
      {
	 char const * const basic = "Basic ";
	 if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
	 {
	    auth.erase(0, strlen(basic));
	    if (auth != authConf)
	    {
	       sendError(log, client, 407, request, sendContent, "Proxy-Authentication doesn't match", headers);
	       return false;
	    }
	 }
	 else
	 {
	    std::list<std::string> headers;
	    headers.push_back("Proxy-Authenticate: Basic");
	    sendError(log, client, 407, request, sendContent, "Unsupported Proxy-Authentication Scheme", headers);
	    return false;
	 }
      }
   }
   else if (absolute.find("path") == std::string::npos && APT::String::Startswith(filename, "/_config/") == false)
   {
      sendError(log, client, 400, request, sendContent, "Request is absolutePath, but configured to not accept that", headers);
      return false;
   }

   if (APT::String::Startswith(filename, "/_config/") == false)
   {
      std::string const authConf = _config->Find("aptwebserver::authorization", "");
      std::string auth = LookupTag(request, "Authorization", "");
      if (authConf.empty() != auth.empty())
      {
	 if (auth.empty())
	    sendError(log, client, 401, request, sendContent, "Server requires authentication", headers);
	 else
	    sendError(log, client, 401, request, sendContent, "Client wants to authenticate to server, but server doesn't need it", headers);
	 return false;
      }
      if (authConf.empty() == false)
      {
	 char const * const basic = "Basic ";
	 if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
	 {
	    auth.erase(0, strlen(basic));
	    if (auth != authConf)
	    {
	       sendError(log, client, 401, request, sendContent, "Authentication doesn't match", headers);
	       return false;
	    }
	 }
	 else
	 {
	    headers.push_back("WWW-Authenticate: Basic");
	    sendError(log, client, 401, request, sendContent, "Unsupported Authentication Scheme", headers);
	    return false;
	 }
      }
   }

   size_t paramspos = filename.find('?');
   if (paramspos != std::string::npos)
   {
      params = filename.substr(paramspos + 1);
      filename.erase(paramspos);
   }

   filename = DeQuoteString(filename);

   // this is not a secure server, but at least prevent the obvious …
   if (filename.empty() == true || filename[0] != '/' ||
       strncmp(filename.c_str(), "//", 2) == 0 ||
       filename.find_first_of("\r\n\t\f\v") != std::string::npos ||
       filename.find("/../") != std::string::npos)
   {
      std::list<std::string> headers;
      sendError(log, client, 400, request, sendContent, "Filename contains illegal character (sequence)", headers);
      return false;
   }

   // nuke the first character which is a / as we assured above
   filename.erase(0, 1);
   if (filename.empty() == true)
      filename = "./";
   // support ~user/ uris to refer to /home/user/public_html/ as a kind-of special directory
   else if (filename[0] == '~')
   {
      // /home/user is actually not entirely correct, but good enough for now
      size_t dashpos = filename.find('/');
      if (dashpos != std::string::npos)
      {
	 std::string home = filename.substr(1, filename.find('/') - 1);
	 std::string pubhtml = filename.substr(filename.find('/') + 1);
	 filename = "/home/" + home + "/public_html/" + pubhtml;
      }
      else
	 filename = "/home/" + filename.substr(1) + "/public_html/";
   }

   // if no filename is given, but a valid directory see if we can use an index or
   // have to resort to a autogenerated directory listing later on
   if (DirectoryExists(filename) == true)
   {
      std::string const directoryIndex = _config->Find("aptwebserver::directoryindex");
      if (directoryIndex.empty() == false && directoryIndex == flNotDir(directoryIndex) &&
	    RealFileExists(filename + directoryIndex) == true)
	 filename += directoryIndex;
   }

   return true;
}
									/*}}}*/
static bool handleOnTheFlyReconfiguration(std::ostream &log, int const client,/*{{{*/
      std::string const &request, std::vector<std::string> parts, std::list<std::string> &headers)
{
   size_t const pcount = parts.size();
   for (size_t i = 0; i < pcount; ++i)
      parts[i] = DeQuoteString(parts[i]);
   if (pcount == 4 && parts[1] == "set")
   {
      _config->Set(parts[2], parts[3]);
      sendSuccess(log, client, request, true, "Option '" + parts[2] + "' was set to '" + parts[3] + "'!", headers);
      return true;
   }
   else if (pcount == 4 && parts[1] == "find")
   {
      std::string response = _config->Find(parts[2], parts[3]);
      addDataHeaders(headers, response);
      if (contentTypeSet(headers) == false)
	 headers.push_back("Content-Type: text/plain; charset=utf-8");
      sendHead(log, client, 200, headers);
      sendData(client, headers, response);
      return true;
   }
   else if (pcount == 3 && parts[1] == "find")
   {
      if (_config->Exists(parts[2]) == true)
      {
	 std::string response = _config->Find(parts[2]);
	 addDataHeaders(headers, response);
	 if (contentTypeSet(headers) == false)
	    headers.push_back("Content-Type: text/plain; charset=utf-8");
	 sendHead(log, client, 200, headers);
	 sendData(client, headers, response);
	 return true;
      }
      sendError(log, client, 404, request, true, "Requested Configuration option doesn't exist", headers);
      return false;
   }
   else if (pcount == 3 && parts[1] == "clear")
   {
      _config->Clear(parts[2]);
      sendSuccess(log, client, request, true, "Option '" + parts[2] + "' was cleared.", headers);
      return true;
   }

   sendError(log, client, 400, request, true, "Unknown on-the-fly configuration request", headers);
   return false;
}
									/*}}}*/
static void * handleClient(int const client, size_t const id)		/*{{{*/
{
   auto logfilepath = _config->FindFile("aptwebserver::logfiles");
   if (logfilepath.empty() == false)
      strprintf(logfilepath, "%s.client-%lu.log", logfilepath.c_str(), id);
   else
      logfilepath = "/dev/null";
   std::ofstream logfile(logfilepath);
   basic_teeostream<char> log(std::clog, logfile);

   log << "ACCEPT client " << client << std::endl;
   bool closeConnection = false;
   while (closeConnection == false)
   {
      std::vector<std::string> messages;
      if (ReadMessages(client, messages) == false)
	 break;

      std::list<std::string> headers;
      for (std::vector<std::string>::const_iterator m = messages.begin();
	    m != messages.end() && closeConnection == false; ++m) {
	 // if we announced a closing in previous response, do the close now
	 if (std::find(headers.begin(), headers.end(), std::string("Connection: close")) != headers.end())
	 {
	    closeConnection = true;
	    break;
	 }
	 headers.clear();

	 log << ">>> REQUEST from " << client << " >>>" << std::endl << *m
	    << std::endl << "<<<<<<<<<<<<<<<<" << std::endl;
	 std::string filename;
	 std::string params;
	 bool sendContent = true;
	 if (parseFirstLine(log, client, *m, filename, params, sendContent, closeConnection, headers) == false)
	    continue;

	 // special webserver command request
	 if (filename.length() > 1 && filename[0] == '_')
	 {
	    std::vector<std::string> parts = VectorizeString(filename, '/');
	    if (parts[0] == "_config")
	    {
	       handleOnTheFlyReconfiguration(log, client, *m, parts, headers);
	       continue;
	    }
	 }

	 // string replacements in the requested filename
	 ::Configuration::Item const *Replaces = _config->Tree("aptwebserver::redirect::replace");
	 if (Replaces != NULL)
	 {
	    std::string redirect = "/" + filename;
	    for (::Configuration::Item *I = Replaces->Child; I != NULL; I = I->Next)
	       redirect = SubstVar(redirect, I->Tag, I->Value);
	    if (redirect.empty() == false && redirect[0] == '/')
	       redirect.erase(0,1);
	    if (redirect != filename)
	    {
	       sendRedirect(log, client, _config->FindI("aptwebserver::redirect::httpcode", 301), redirect, *m, sendContent);
	       continue;
	    }
	 }

	 ::Configuration::Item const *Overwrite = _config->Tree("aptwebserver::overwrite");
	 if (Overwrite != NULL)
	 {
	    for (::Configuration::Item *I = Overwrite->Child; I != NULL; I = I->Next)
	    {
	       regex_t *pattern = new regex_t;
	       int const res = regcomp(pattern, I->Tag.c_str(), REG_EXTENDED | REG_ICASE | REG_NOSUB);
	       if (res != 0)
	       {
		  char error[300];
		  regerror(res, pattern, error, sizeof(error));
		  sendError(log, client, 500, *m, sendContent, error, headers);
		  continue;
	       }
	       if (regexec(pattern, filename.c_str(), 0, 0, 0) == 0)
	       {
		  filename = _config->Find("aptwebserver::overwrite::" + I->Tag + "::filename", flNotDir(filename));
		  if (filename.find("/") == std::string::npos)
		  {
		     auto directory = _config->Find("aptwebserver::overwrite::" + I->Tag + "::directory", flNotFile(filename));
		     filename = flCombine(directory, filename);
		  }
		  if (filename.empty() == false && filename[0] == '/')
		     filename.erase(0,1);
		  if (filename.empty())
		     filename = "./";
		  regfree(pattern);
		  break;
	       }
	       regfree(pattern);
	    }
	 }

	 // automatic retry can be tested with this
	 {
	    int failrequests = _config->FindI("aptwebserver::failrequest::" + filename, 0);
	    if (failrequests != 0)
	    {
	       --failrequests;
	       _config->Set(("aptwebserver::failrequest::" + filename).c_str(), failrequests);
	       sendError(log, client, _config->FindI("aptwebserver::failrequest", 400), *m, sendContent, "Server is configured to fail this file.", headers);
	       continue;
	    }
	 }

	 // deal with the request
	 unsigned int const httpsport = _config->FindI("aptwebserver::port::https", 4433);
	 std::string hosthttpsport;
	 strprintf(hosthttpsport, ":%u", httpsport);
	 if (_config->FindB("aptwebserver::support::http", true) == false &&
	       LookupTag(*m, "Host").find(hosthttpsport) == std::string::npos)
	 {
	    sendError(log, client, 400, *m, sendContent, "HTTP disabled, all requests must be HTTPS", headers);
	    continue;
	 }
	 else if (RealFileExists(filename) == true)
	 {
	    FileFd data(filename, FileFd::ReadOnly);
	    std::string condition = LookupTag(*m, "If-Modified-Since", "");
	    if (_config->FindB("aptwebserver::support::modified-since", true) == true && condition.empty() == false)
	    {
	       time_t cache;
	       if (RFC1123StrToTime(condition, cache) == true &&
		     cache >= data.ModificationTime())
	       {
		  sendHead(log, client, 304, headers);
		  continue;
	       }
	    }

	    if (_config->FindB("aptwebserver::support::range", true) == true)
	       condition = LookupTag(*m, "Range", "");
	    else
	       condition.clear();
	    if (condition.empty() == false && strncmp(condition.c_str(), "bytes=", 6) == 0)
	    {
	       std::string ranges = ',' + _config->Find("aptwebserver::response-header::Accept-Ranges") + ',';
	       ranges.erase(std::remove(ranges.begin(), ranges.end(), ' '), ranges.end());
	       if (ranges.find(",bytes,") == std::string::npos)
	       {
		  // we handle it as an error here because we are a test server - a real one should just ignore it
		  sendError(log, client, 400, *m, sendContent, "Client does range requests we don't support", headers);
		  continue;
	       }

	       time_t cache;
	       std::string ifrange;
	       if (_config->FindB("aptwebserver::support::if-range", true) == true)
		  ifrange = LookupTag(*m, "If-Range", "");
	       bool validrange = (ifrange.empty() == true ||
		     (RFC1123StrToTime(ifrange, cache) == true &&
		      cache <= data.ModificationTime()));

	       // FIXME: support multiple byte-ranges (APT clients do not do this)
	       if (condition.find(',') == std::string::npos)
	       {
		  size_t start = 6;
		  unsigned long long filestart = strtoull(condition.c_str() + start, NULL, 10);
		  // FIXME: no support for last-byte-pos being not the end of the file (APT clients do not do this)
		  size_t dash = condition.find('-') + 1;
		  unsigned long long fileend = strtoull(condition.c_str() + dash, NULL, 10);
		  unsigned long long filesize = data.FileSize();
		  if ((fileend == 0 || (fileend == filesize && fileend >= filestart)) &&
			validrange == true)
		  {
		     if (filesize > filestart)
		     {
			data.Skip(filestart);
                        // make sure to send content-range before conent-length
                        // as regression test for LP: #1445239
			std::ostringstream contentrange;
			contentrange << "Content-Range: bytes " << filestart << "-"
			   << filesize - 1 << "/" << filesize;
			headers.push_back(contentrange.str());
			std::ostringstream contentlength;
			contentlength << "Content-Length: " << (filesize - filestart);
			headers.push_back(contentlength.str());
			sendHead(log, client, 206, headers);
			if (sendContent == true)
			   sendFile(client, headers, data);
			continue;
		     }
		     else
		     {
			if (_config->FindB("aptwebserver::support::content-range", true) == true)
			{
			   std::ostringstream contentrange;
			   contentrange << "Content-Range: bytes */" << filesize;
			   headers.push_back(contentrange.str());
			}
			sendError(log, client, 416, *m, sendContent, "", headers);
			continue;
		     }
		  }
	       }
	    }

	    addFileHeaders(headers, data);
	    sendHead(log, client, 200, headers);
	    if (sendContent == true)
	       sendFile(client, headers, data);
	 }
	 else if (DirectoryExists(filename) == true)
	 {
	    if (filename[filename.length()-1] == '/')
	       sendDirectoryListing(log, client, filename, *m, sendContent, headers);
	    else
	       sendRedirect(log, client, 301, filename.append("/"), *m, sendContent);
	 }
	 else
	    sendError(log, client, 404, *m, sendContent, "", headers);
      }

      // if we announced a closing in the last response, do the close now
      if (std::find(headers.begin(), headers.end(), std::string("Connection: close")) != headers.end())
	 closeConnection = true;

      if (_error->PendingError() == true)
	 break;
      _error->DumpErrors(std::cerr);
   }
   _error->DumpErrors(std::cerr);
   close(client);
   log << "CLOSE client " << client << std::endl;
   return NULL;
}
									/*}}}*/
static void loadMimeTypesFile(std::string const &filename)		/*{{{*/
{
   if (FileExists(filename) == false)
      return;

   std::string line;
   FileFd mimetypes(filename, FileFd::ReadOnly);
   while (mimetypes.ReadLine(line))
   {
      if (line.empty() || line[0] == '#' || line.find_first_not_of(" \t\r") == std::string::npos)
	 continue;
      std::transform(line.begin(), line.end(), line.begin(), [](char const c) { return c == ' ' ? '\t' : c; });
      auto l = VectorizeString(line, '\t');
      l.erase(std::remove_if(l.begin(), l.end(), [](std::string const &f) { return f.empty(); }), l.end());
      if (l.size() < 2)
	 continue;
      for (size_t i = 1; i < l.size(); ++i)
	 if (l[i].empty() == false)
	    _config->CndSet(std::string("aptwebserver::content-type::by-extension::").append(l[i]).c_str(), l[0]);
   }
}
									/*}}}*/

int main(int const argc, const char * argv[])
{
   CommandLine::Args Args[] = {
      {'p', "port", "aptwebserver::port", CommandLine::HasArg},
      {0, "request-absolute", "aptwebserver::request::absolute", CommandLine::HasArg},
      {0, "authorization", "aptwebserver::authorization", CommandLine::HasArg},
      {0, "proxy-authorization", "aptwebserver::proxy-authorization", CommandLine::HasArg},
      {0, "logfiles", "aptwebserver::logfiles", CommandLine::HasArg},
      {'c',"config-file",0,CommandLine::ConfigFile},
      {'o',"option",0,CommandLine::ArbItem},
      {0,0,0,0}
   };

   CommandLine CmdL(Args, _config);
   if(CmdL.Parse(argc,argv) == false)
   {
      _error->DumpErrors();
      exit(1);
   }

   if (_config->FindB("aptwebserver::content-type::mime.types", true))
   {
      if (_config->FindB("aptwebserver::content-type::mime.types::apt", true))
	 loadMimeTypesFile("/etc/apt/mime.types");

      if (_config->FindB("aptwebserver::content-type::mime.types::home", true))
      {
	 auto const home = getenv("HOME");
	 if (home != nullptr)
	    loadMimeTypesFile(flCombine(home, ".mime.types"));
      }

      if (_config->FindB("aptwebserver::content-type::mime.types::etc", true))
	 loadMimeTypesFile("/etc/mime.types");
   }

   // create socket, bind and listen to it {{{
   // ignore SIGPIPE, this can happen on write() if the socket closes connection
   signal(SIGPIPE, SIG_IGN);
   // we don't care for our slaves, so ignore their death
   signal(SIGCHLD, SIG_IGN);

   int sock = socket(AF_INET6, SOCK_STREAM, 0);
   if(sock < 0)
   {
      _error->Errno("aptwerbserver", "Couldn't create socket");
      _error->DumpErrors(std::cerr);
      return 1;
   }

   int port = _config->FindI("aptwebserver::port", 8080);

   // ensure that we accept all connections: v4 or v6
   int const iponly = 0;
   setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly));
   // to not linger on an address
   int const enable = 1;
   setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));

   struct sockaddr_in6 locAddr;
   memset(&locAddr, 0, sizeof(locAddr));
   locAddr.sin6_family = AF_INET6;
   locAddr.sin6_port = htons(port);
   locAddr.sin6_addr = in6addr_any;

   if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0)
   {
      _error->Errno("aptwerbserver", "Couldn't bind");
      _error->DumpErrors(std::cerr);
      return 2;
   }

   if (port == 0)
   {
      struct sockaddr_in6 addr;
      socklen_t addrlen = sizeof(sockaddr_in6);
      if (getsockname(sock, (struct sockaddr*) &addr, &addrlen) != 0)
	 _error->Errno("getsockname", "Could not get chosen port number");
      else
	 port = ntohs(addr.sin6_port);
   }
   std::string const portfilename = _config->Find("aptwebserver::portfile", "");
   if (portfilename.empty() == false)
   {
      FileFd portfile(portfilename, FileFd::WriteOnly | FileFd::Create | FileFd::Empty);
      std::string portcontent;
      strprintf(portcontent, "%d", port);
      portfile.Write(portcontent.c_str(), portcontent.size());
      portfile.Sync();
   }
   _config->Set("aptwebserver::port::http", port);

   FileFd pidfile;
   if (_config->FindB("aptwebserver::fork", false) == true)
   {
      std::string const pidfilename = _config->Find("aptwebserver::pidfile", "aptwebserver.pid");
      int const pidfilefd = GetLock(pidfilename);
      if (pidfilefd < 0 || pidfile.OpenDescriptor(pidfilefd, FileFd::WriteOnly) == false)
      {
	 _error->Errno("aptwebserver", "Couldn't acquire lock on pidfile '%s'", pidfilename.c_str());
	 _error->DumpErrors(std::cerr);
	 return 3;
      }

      pid_t child = fork();
      if (child < 0)
      {
	 _error->Errno("aptwebserver", "Forking failed");
	 _error->DumpErrors(std::cerr);
	 return 4;
      }
      else if (child != 0)
      {
	 // successfully forked: ready to serve!
	 std::string pidcontent;
	 strprintf(pidcontent, "%d", child);
	 pidfile.Write(pidcontent.c_str(), pidcontent.size());
	 pidfile.Sync();
	 if (_error->PendingError() == true)
	 {
	    _error->DumpErrors(std::cerr);
	    return 5;
	 }
	 std::cout << "Successfully forked as " << child << std::endl;
	 return 0;
      }
   }

   std::clog << "Serving ANY file on port: " << port << std::endl;

   int const slaves = _config->FindI("aptwebserver::slaves", SOMAXCONN);
   std::cerr << "SLAVES: " << slaves << std::endl;
   listen(sock, slaves);
   /*}}}*/

   _config->CndSet("aptwebserver::response-header::Server", "APT webserver");
   _config->CndSet("aptwebserver::response-header::Accept-Ranges", "bytes");
   _config->CndSet("aptwebserver::directoryindex", "index.html");
   APT::Configuration::getCompressors();

   size_t id = 0;
   while (true)
   {
      int client = accept(sock, NULL, NULL);
      if (client == -1)
      {
	 if (errno == EINTR)
	    continue;
	 _error->Errno("accept", "Couldn't accept client on socket %d", sock);
	 _error->DumpErrors(std::cerr);
	 return 6;
      }

      std::thread t(handleClient, client, ++id);
      t.detach();
   }
   pidfile.Close();

   return 0;
}