aboutsummaryrefslogtreecommitdiff
path: root/usr.bin/mandoc/cgi.c
blob: c6db66fd82a53c8140acd1cf81a77c8eb30e782d (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
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
/* $OpenBSD: cgi.c,v 1.111 2020/06/29 19:16:59 schwarze Exp $ */
/*
 * Copyright (c) 2014-2019 Ingo Schwarze <schwarze@usta.de>
 * Copyright (c) 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Implementation of the man.cgi(8) program.
 */
#include <sys/types.h>
#include <sys/time.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "mandoc_aux.h"
#include "mandoc.h"
#include "roff.h"
#include "mdoc.h"
#include "man.h"
#include "mandoc_parse.h"
#include "main.h"
#include "manconf.h"
#include "mansearch.h"
#include "cgi.h"

/*
 * A query as passed to the search function.
 */
struct	query {
	char		*manpath; /* desired manual directory */
	char		*arch; /* architecture */
	char		*sec; /* manual section */
	char		*query; /* unparsed query expression */
	int		 equal; /* match whole names, not substrings */
};

struct	req {
	struct query	  q;
	char		**p; /* array of available manpaths */
	size_t		  psz; /* number of available manpaths */
	int		  isquery; /* QUERY_STRING used, not PATH_INFO */
};

enum	focus {
	FOCUS_NONE = 0,
	FOCUS_QUERY
};

static	void		 html_print(const char *);
static	void		 html_putchar(char);
static	int		 http_decode(char *);
static	void		 http_encode(const char *);
static	void		 parse_manpath_conf(struct req *);
static	void		 parse_path_info(struct req *, const char *);
static	void		 parse_query_string(struct req *, const char *);
static	void		 pg_error_badrequest(const char *);
static	void		 pg_error_internal(void);
static	void		 pg_index(const struct req *);
static	void		 pg_noresult(const struct req *, int, const char *,
				const char *);
static	void		 pg_redirect(const struct req *, const char *);
static	void		 pg_search(const struct req *);
static	void		 pg_searchres(const struct req *,
				struct manpage *, size_t);
static	void		 pg_show(struct req *, const char *);
static	void		 resp_begin_html(int, const char *, const char *);
static	void		 resp_begin_http(int, const char *);
static	void		 resp_catman(const struct req *, const char *);
static	void		 resp_copy(const char *);
static	void		 resp_end_html(void);
static	void		 resp_format(const struct req *, const char *);
static	void		 resp_searchform(const struct req *, enum focus);
static	void		 resp_show(const struct req *, const char *);
static	void		 set_query_attr(char **, char **);
static	int		 validate_arch(const char *);
static	int		 validate_filename(const char *);
static	int		 validate_manpath(const struct req *, const char *);
static	int		 validate_urifrag(const char *);

static	const char	 *scriptname = SCRIPT_NAME;

static	const int sec_prios[] = {1, 4, 5, 8, 6, 3, 7, 2, 9};
static	const char *const sec_numbers[] = {
    "0", "1", "2", "3", "3p", "4", "5", "6", "7", "8", "9"
};
static	const char *const sec_names[] = {
    "All Sections",
    "1 - General Commands",
    "2 - System Calls",
    "3 - Library Functions",
    "3p - Perl Library",
    "4 - Device Drivers",
    "5 - File Formats",
    "6 - Games",
    "7 - Miscellaneous Information",
    "8 - System Manager\'s Manual",
    "9 - Kernel Developer\'s Manual"
};
static	const int sec_MAX = sizeof(sec_names) / sizeof(char *);

static	const char *const arch_names[] = {
    "amd64",       "alpha",       "armv7",       "arm64",
    "hppa",        "i386",        "landisk",     "loongson",
    "luna88k",     "macppc",      "mips64",      "octeon",
    "powerpc64",   "sgi",         "socppc",      "sparc64",

    "amiga",       "arc",         "armish",      "arm32",
    "atari",       "aviion",      "beagle",      "cats",
    "hppa64",      "hp300",
    "ia64",        "mac68k",      "mvme68k",     "mvme88k",
    "mvmeppc",     "palm",        "pc532",       "pegasos",
    "pmax",        "powerpc",     "solbourne",   "sparc",
    "sun3",        "vax",         "wgrisc",      "x68k",
    "zaurus"
};
static	const int arch_MAX = sizeof(arch_names) / sizeof(char *);

/*
 * Print a character, escaping HTML along the way.
 * This will pass non-ASCII straight to output: be warned!
 */
static void
html_putchar(char c)
{

	switch (c) {
	case '"':
		printf("&quot;");
		break;
	case '&':
		printf("&amp;");
		break;
	case '>':
		printf("&gt;");
		break;
	case '<':
		printf("&lt;");
		break;
	default:
		putchar((unsigned char)c);
		break;
	}
}

/*
 * Call through to html_putchar().
 * Accepts NULL strings.
 */
static void
html_print(const char *p)
{

	if (NULL == p)
		return;
	while ('\0' != *p)
		html_putchar(*p++);
}

/*
 * Transfer the responsibility for the allocated string *val
 * to the query structure.
 */
static void
set_query_attr(char **attr, char **val)
{

	free(*attr);
	if (**val == '\0') {
		*attr = NULL;
		free(*val);
	} else
		*attr = *val;
	*val = NULL;
}

/*
 * Parse the QUERY_STRING for key-value pairs
 * and store the values into the query structure.
 */
static void
parse_query_string(struct req *req, const char *qs)
{
	char		*key, *val;
	size_t		 keysz, valsz;

	req->isquery	= 1;
	req->q.manpath	= NULL;
	req->q.arch	= NULL;
	req->q.sec	= NULL;
	req->q.query	= NULL;
	req->q.equal	= 1;

	key = val = NULL;
	while (*qs != '\0') {

		/* Parse one key. */

		keysz = strcspn(qs, "=;&");
		key = mandoc_strndup(qs, keysz);
		qs += keysz;
		if (*qs != '=')
			goto next;

		/* Parse one value. */

		valsz = strcspn(++qs, ";&");
		val = mandoc_strndup(qs, valsz);
		qs += valsz;

		/* Decode and catch encoding errors. */

		if ( ! (http_decode(key) && http_decode(val)))
			goto next;

		/* Handle key-value pairs. */

		if ( ! strcmp(key, "query"))
			set_query_attr(&req->q.query, &val);

		else if ( ! strcmp(key, "apropos"))
			req->q.equal = !strcmp(val, "0");

		else if ( ! strcmp(key, "manpath")) {
#ifdef COMPAT_OLDURI
			if ( ! strncmp(val, "OpenBSD ", 8)) {
				val[7] = '-';
				if ('C' == val[8])
					val[8] = 'c';
			}
#endif
			set_query_attr(&req->q.manpath, &val);
		}

		else if ( ! (strcmp(key, "sec")
#ifdef COMPAT_OLDURI
		    && strcmp(key, "sektion")
#endif
		    )) {
			if ( ! strcmp(val, "0"))
				*val = '\0';
			set_query_attr(&req->q.sec, &val);
		}

		else if ( ! strcmp(key, "arch")) {
			if ( ! strcmp(val, "default"))
				*val = '\0';
			set_query_attr(&req->q.arch, &val);
		}

		/*
		 * The key must be freed in any case.
		 * The val may have been handed over to the query
		 * structure, in which case it is now NULL.
		 */
next:
		free(key);
		key = NULL;
		free(val);
		val = NULL;

		if (*qs != '\0')
			qs++;
	}
}

/*
 * HTTP-decode a string.  The standard explanation is that this turns
 * "%4e+foo" into "n foo" in the regular way.  This is done in-place
 * over the allocated string.
 */
static int
http_decode(char *p)
{
	char             hex[3];
	char		*q;
	int              c;

	hex[2] = '\0';

	q = p;
	for ( ; '\0' != *p; p++, q++) {
		if ('%' == *p) {
			if ('\0' == (hex[0] = *(p + 1)))
				return 0;
			if ('\0' == (hex[1] = *(p + 2)))
				return 0;
			if (1 != sscanf(hex, "%x", &c))
				return 0;
			if ('\0' == c)
				return 0;

			*q = (char)c;
			p += 2;
		} else
			*q = '+' == *p ? ' ' : *p;
	}

	*q = '\0';
	return 1;
}

static void
http_encode(const char *p)
{
	for (; *p != '\0'; p++) {
		if (isalnum((unsigned char)*p) == 0 &&
		    strchr("-._~", *p) == NULL)
			printf("%%%2.2X", (unsigned char)*p);
		else
			putchar(*p);
	}
}

static void
resp_begin_http(int code, const char *msg)
{

	if (200 != code)
		printf("Status: %d %s\r\n", code, msg);

	printf("Content-Type: text/html; charset=utf-8\r\n"
	     "Cache-Control: no-cache\r\n"
	     "Content-Security-Policy: default-src 'none'; "
	     "style-src 'self' 'unsafe-inline'\r\n"
	     "Pragma: no-cache\r\n"
	     "\r\n");

	fflush(stdout);
}

static void
resp_copy(const char *filename)
{
	char	 buf[4096];
	ssize_t	 sz;
	int	 fd;

	if ((fd = open(filename, O_RDONLY)) != -1) {
		fflush(stdout);
		while ((sz = read(fd, buf, sizeof(buf))) > 0)
			write(STDOUT_FILENO, buf, sz);
		close(fd);
	}
}

static void
resp_begin_html(int code, const char *msg, const char *file)
{
	char	*cp;

	resp_begin_http(code, msg);

	printf("<!DOCTYPE html>\n"
	       "<html>\n"
	       "<head>\n"
	       "  <meta charset=\"UTF-8\"/>\n"
	       "  <meta name=\"viewport\""
		      " content=\"width=device-width, initial-scale=1.0\">\n"
	       "  <link rel=\"stylesheet\" href=\"%s/mandoc.css\""
	       " type=\"text/css\" media=\"all\">\n"
	       "  <title>",
	       CSS_DIR);
	if (file != NULL) {
		if ((cp = strrchr(file, '/')) != NULL)
			file = cp + 1;
		if ((cp = strrchr(file, '.')) != NULL) {
			printf("%.*s(%s) - ", (int)(cp - file), file, cp + 1);
		} else
			printf("%s - ", file);
	}
	printf("%s</title>\n"
	       "</head>\n"
	       "<body>\n",
	       CUSTOMIZE_TITLE);

	resp_copy(MAN_DIR "/header.html");
}

static void
resp_end_html(void)
{

	resp_copy(MAN_DIR "/footer.html");

	puts("</body>\n"
	     "</html>");
}

static void
resp_searchform(const struct req *req, enum focus focus)
{
	int		 i;

	printf("<form action=\"/%s\" method=\"get\" "
	       "autocomplete=\"off\" autocapitalize=\"none\">\n"
	       "  <fieldset>\n"
	       "    <legend>Manual Page Search Parameters</legend>\n",
	       scriptname);

	/* Write query input box. */

	printf("    <input type=\"search\" name=\"query\" value=\"");
	if (req->q.query != NULL)
		html_print(req->q.query);
	printf( "\" size=\"40\"");
	if (focus == FOCUS_QUERY)
		printf(" autofocus");
	puts(">");

	/* Write submission buttons. */

	printf(	"    <button type=\"submit\" name=\"apropos\" value=\"0\">"
		"man</button>\n"
		"    <button type=\"submit\" name=\"apropos\" value=\"1\">"
		"apropos</button>\n"
		"    <br/>\n");

	/* Write section selector. */

	puts("    <select name=\"sec\">");
	for (i = 0; i < sec_MAX; i++) {
		printf("      <option value=\"%s\"", sec_numbers[i]);
		if (NULL != req->q.sec &&
		    0 == strcmp(sec_numbers[i], req->q.sec))
			printf(" selected=\"selected\"");
		printf(">%s</option>\n", sec_names[i]);
	}
	puts("    </select>");

	/* Write architecture selector. */

	printf(	"    <select name=\"arch\">\n"
		"      <option value=\"default\"");
	if (NULL == req->q.arch)
		printf(" selected=\"selected\"");
	puts(">All Architectures</option>");
	for (i = 0; i < arch_MAX; i++) {
		printf("      <option");
		if (NULL != req->q.arch &&
		    0 == strcmp(arch_names[i], req->q.arch))
			printf(" selected=\"selected\"");
		printf(">%s</option>\n", arch_names[i]);
	}
	puts("    </select>");

	/* Write manpath selector. */

	if (req->psz > 1) {
		puts("    <select name=\"manpath\">");
		for (i = 0; i < (int)req->psz; i++) {
			printf("      <option");
			if (strcmp(req->q.manpath, req->p[i]) == 0)
				printf(" selected=\"selected\"");
			printf(">");
			html_print(req->p[i]);
			puts("</option>");
		}
		puts("    </select>");
	}

	puts("  </fieldset>\n"
	     "</form>");
}

static int
validate_urifrag(const char *frag)
{

	while ('\0' != *frag) {
		if ( ! (isalnum((unsigned char)*frag) ||
		    '-' == *frag || '.' == *frag ||
		    '/' == *frag || '_' == *frag))
			return 0;
		frag++;
	}
	return 1;
}

static int
validate_manpath(const struct req *req, const char* manpath)
{
	size_t	 i;

	for (i = 0; i < req->psz; i++)
		if ( ! strcmp(manpath, req->p[i]))
			return 1;

	return 0;
}

static int
validate_arch(const char *arch)
{
	int	 i;

	for (i = 0; i < arch_MAX; i++)
		if (strcmp(arch, arch_names[i]) == 0)
			return 1;

	return 0;
}

static int
validate_filename(const char *file)
{

	if ('.' == file[0] && '/' == file[1])
		file += 2;

	return ! (strstr(file, "../") || strstr(file, "/..") ||
	    (strncmp(file, "man", 3) && strncmp(file, "cat", 3)));
}

static void
pg_index(const struct req *req)
{

	resp_begin_html(200, NULL, NULL);
	resp_searchform(req, FOCUS_QUERY);
	printf("<p>\n"
	       "This web interface is documented in the\n"
	       "<a class=\"Xr\" href=\"/%s%sman.cgi.8\">man.cgi(8)</a>\n"
	       "manual, and the\n"
	       "<a class=\"Xr\" href=\"/%s%sapropos.1\">apropos(1)</a>\n"
	       "manual explains the query syntax.\n"
	       "</p>\n",
	       scriptname, *scriptname == '\0' ? "" : "/",
	       scriptname, *scriptname == '\0' ? "" : "/");
	resp_end_html();
}

static void
pg_noresult(const struct req *req, int code, const char *http_msg,
    const char *user_msg)
{
	resp_begin_html(code, http_msg, NULL);
	resp_searchform(req, FOCUS_QUERY);
	puts("<p>");
	puts(user_msg);
	puts("</p>");
	resp_end_html();
}

static void
pg_error_badrequest(const char *msg)
{

	resp_begin_html(400, "Bad Request", NULL);
	puts("<h1>Bad Request</h1>\n"
	     "<p>\n");
	puts(msg);
	printf("Try again from the\n"
	       "<a href=\"/%s\">main page</a>.\n"
	       "</p>", scriptname);
	resp_end_html();
}

static void
pg_error_internal(void)
{
	resp_begin_html(500, "Internal Server Error", NULL);
	puts("<p>Internal Server Error</p>");
	resp_end_html();
}

static void
pg_redirect(const struct req *req, const char *name)
{
	printf("Status: 303 See Other\r\n"
	    "Location: /");
	if (*scriptname != '\0')
		printf("%s/", scriptname);
	if (strcmp(req->q.manpath, req->p[0]))
		printf("%s/", req->q.manpath);
	if (req->q.arch != NULL)
		printf("%s/", req->q.arch);
	http_encode(name);
	if (req->q.sec != NULL) {
		putchar('.');
		http_encode(req->q.sec);
	}
	printf("\r\nContent-Type: text/html; charset=utf-8\r\n\r\n");
}

static void
pg_searchres(const struct req *req, struct manpage *r, size_t sz)
{
	char		*arch, *archend;
	const char	*sec;
	size_t		 i, iuse;
	int		 archprio, archpriouse;
	int		 prio, priouse;

	for (i = 0; i < sz; i++) {
		if (validate_filename(r[i].file))
			continue;
		warnx("invalid filename %s in %s database",
		    r[i].file, req->q.manpath);
		pg_error_internal();
		return;
	}

	if (req->isquery && sz == 1) {
		/*
		 * If we have just one result, then jump there now
		 * without any delay.
		 */
		printf("Status: 303 See Other\r\n"
		    "Location: /");
		if (*scriptname != '\0')
			printf("%s/", scriptname);
		if (strcmp(req->q.manpath, req->p[0]))
			printf("%s/", req->q.manpath);
		printf("%s\r\n"
		    "Content-Type: text/html; charset=utf-8\r\n\r\n",
		    r[0].file);
		return;
	}

	/*
	 * In man(1) mode, show one of the pages
	 * even if more than one is found.
	 */

	iuse = 0;
	if (req->q.equal || sz == 1) {
		priouse = 20;
		archpriouse = 3;
		for (i = 0; i < sz; i++) {
			sec = r[i].file;
			sec += strcspn(sec, "123456789");
			if (sec[0] == '\0')
				continue;
			prio = sec_prios[sec[0] - '1'];
			if (sec[1] != '/')
				prio += 10;
			if (req->q.arch == NULL) {
				archprio =
				    ((arch = strchr(sec + 1, '/'))
					== NULL) ? 3 :
				    ((archend = strchr(arch + 1, '/'))
					== NULL) ? 0 :
				    strncmp(arch, "amd64/",
					archend - arch) ? 2 : 1;
				if (archprio < archpriouse) {
					archpriouse = archprio;
					priouse = prio;
					iuse = i;
					continue;
				}
				if (archprio > archpriouse)
					continue;
			}
			if (prio >= priouse)
				continue;
			priouse = prio;
			iuse = i;
		}
		resp_begin_html(200, NULL, r[iuse].file);
	} else
		resp_begin_html(200, NULL, NULL);

	resp_searchform(req,
	    req->q.equal || sz == 1 ? FOCUS_NONE : FOCUS_QUERY);

	if (sz > 1) {
		puts("<table class=\"results\">");
		for (i = 0; i < sz; i++) {
			printf("  <tr>\n"
			       "    <td>"
			       "<a class=\"Xr\" href=\"/");
			if (*scriptname != '\0')
				printf("%s/", scriptname);
			if (strcmp(req->q.manpath, req->p[0]))
				printf("%s/", req->q.manpath);
			printf("%s\">", r[i].file);
			html_print(r[i].names);
			printf("</a></td>\n"
			       "    <td><span class=\"Nd\">");
			html_print(r[i].output);
			puts("</span></td>\n"
			     "  </tr>");
		}
		puts("</table>");
	}

	if (req->q.equal || sz == 1) {
		puts("<hr>");
		resp_show(req, r[iuse].file);
	}

	resp_end_html();
}

static void
resp_catman(const struct req *req, const char *file)
{
	FILE		*f;
	char		*p;
	size_t		 sz;
	ssize_t		 len;
	int		 i;
	int		 italic, bold;

	if ((f = fopen(file, "r")) == NULL) {
		puts("<p>You specified an invalid manual file.</p>");
		return;
	}

	puts("<div class=\"catman\">\n"
	     "<pre>");

	p = NULL;
	sz = 0;

	while ((len = getline(&p, &sz, f)) != -1) {
		bold = italic = 0;
		for (i = 0; i < len - 1; i++) {
			/*
			 * This means that the catpage is out of state.
			 * Ignore it and keep going (although the
			 * catpage is bogus).
			 */

			if ('\b' == p[i] || '\n' == p[i])
				continue;

			/*
			 * Print a regular character.
			 * Close out any bold/italic scopes.
			 * If we're in back-space mode, make sure we'll
			 * have something to enter when we backspace.
			 */

			if ('\b' != p[i + 1]) {
				if (italic)
					printf("</i>");
				if (bold)
					printf("</b>");
				italic = bold = 0;
				html_putchar(p[i]);
				continue;
			} else if (i + 2 >= len)
				continue;

			/* Italic mode. */

			if ('_' == p[i]) {
				if (bold)
					printf("</b>");
				if ( ! italic)
					printf("<i>");
				bold = 0;
				italic = 1;
				i += 2;
				html_putchar(p[i]);
				continue;
			}

			/*
			 * Handle funny behaviour troff-isms.
			 * These grok'd from the original man2html.c.
			 */

			if (('+' == p[i] && 'o' == p[i + 2]) ||
					('o' == p[i] && '+' == p[i + 2]) ||
					('|' == p[i] && '=' == p[i + 2]) ||
					('=' == p[i] && '|' == p[i + 2]) ||
					('*' == p[i] && '=' == p[i + 2]) ||
					('=' == p[i] && '*' == p[i + 2]) ||
					('*' == p[i] && '|' == p[i + 2]) ||
					('|' == p[i] && '*' == p[i + 2]))  {
				if (italic)
					printf("</i>");
				if (bold)
					printf("</b>");
				italic = bold = 0;
				putchar('*');
				i += 2;
				continue;
			} else if (('|' == p[i] && '-' == p[i + 2]) ||
					('-' == p[i] && '|' == p[i + 1]) ||
					('+' == p[i] && '-' == p[i + 1]) ||
					('-' == p[i] && '+' == p[i + 1]) ||
					('+' == p[i] && '|' == p[i + 1]) ||
					('|' == p[i] && '+' == p[i + 1]))  {
				if (italic)
					printf("</i>");
				if (bold)
					printf("</b>");
				italic = bold = 0;
				putchar('+');
				i += 2;
				continue;
			}

			/* Bold mode. */

			if (italic)
				printf("</i>");
			if ( ! bold)
				printf("<b>");
			bold = 1;
			italic = 0;
			i += 2;
			html_putchar(p[i]);
		}

		/*
		 * Clean up the last character.
		 * We can get to a newline; don't print that.
		 */

		if (italic)
			printf("</i>");
		if (bold)
			printf("</b>");

		if (i == len - 1 && p[i] != '\n')
			html_putchar(p[i]);

		putchar('\n');
	}
	free(p);

	puts("</pre>\n"
	     "</div>");

	fclose(f);
}

static void
resp_format(const struct req *req, const char *file)
{
	struct manoutput conf;
	struct mparse	*mp;
	struct roff_meta *meta;
	void		*vp;
	int		 fd;
	int		 usepath;

	if (-1 == (fd = open(file, O_RDONLY, 0))) {
		puts("<p>You specified an invalid manual file.</p>");
		return;
	}

	mchars_alloc();
	mp = mparse_alloc(MPARSE_SO | MPARSE_UTF8 | MPARSE_LATIN1 |
	    MPARSE_VALIDATE, MANDOC_OS_OTHER, req->q.manpath);
	mparse_readfd(mp, fd, file);
	close(fd);
	meta = mparse_result(mp);

	memset(&conf, 0, sizeof(conf));
	conf.fragment = 1;
	conf.style = mandoc_strdup(CSS_DIR "/mandoc.css");
	usepath = strcmp(req->q.manpath, req->p[0]);
	mandoc_asprintf(&conf.man, "/%s%s%s%s%%N.%%S",
	    scriptname, *scriptname == '\0' ? "" : "/",
	    usepath ? req->q.manpath : "", usepath ? "/" : "");

	vp = html_alloc(&conf);
	if (meta->macroset == MACROSET_MDOC)
		html_mdoc(vp, meta);
	else
		html_man(vp, meta);

	html_free(vp);
	mparse_free(mp);
	mchars_free();
	free(conf.man);
	free(conf.style);
}

static void
resp_show(const struct req *req, const char *file)
{

	if ('.' == file[0] && '/' == file[1])
		file += 2;

	if ('c' == *file)
		resp_catman(req, file);
	else
		resp_format(req, file);
}

static void
pg_show(struct req *req, const char *fullpath)
{
	char		*manpath;
	const char	*file;

	if ((file = strchr(fullpath, '/')) == NULL) {
		pg_error_badrequest(
		    "You did not specify a page to show.");
		return;
	}
	manpath = mandoc_strndup(fullpath, file - fullpath);
	file++;

	if ( ! validate_manpath(req, manpath)) {
		pg_error_badrequest(
		    "You specified an invalid manpath.");
		free(manpath);
		return;
	}

	/*
	 * Begin by chdir()ing into the manpath.
	 * This way we can pick up the database files, which are
	 * relative to the manpath root.
	 */

	if (chdir(manpath) == -1) {
		warn("chdir %s", manpath);
		pg_error_internal();
		free(manpath);
		return;
	}
	free(manpath);

	if ( ! validate_filename(file)) {
		pg_error_badrequest(
		    "You specified an invalid manual file.");
		return;
	}

	resp_begin_html(200, NULL, file);
	resp_searchform(req, FOCUS_NONE);
	resp_show(req, file);
	resp_end_html();
}

static void
pg_search(const struct req *req)
{
	struct mansearch	  search;
	struct manpaths		  paths;
	struct manpage		 *res;
	char			**argv;
	char			 *query, *rp, *wp;
	size_t			  ressz;
	int			  argc;

	/*
	 * Begin by chdir()ing into the root of the manpath.
	 * This way we can pick up the database files, which are
	 * relative to the manpath root.
	 */

	if (chdir(req->q.manpath) == -1) {
		warn("chdir %s", req->q.manpath);
		pg_error_internal();
		return;
	}

	search.arch = req->q.arch;
	search.sec = req->q.sec;
	search.outkey = "Nd";
	search.argmode = req->q.equal ? ARG_NAME : ARG_EXPR;
	search.firstmatch = 1;

	paths.sz = 1;
	paths.paths = mandoc_malloc(sizeof(char *));
	paths.paths[0] = mandoc_strdup(".");

	/*
	 * Break apart at spaces with backslash-escaping.
	 */

	argc = 0;
	argv = NULL;
	rp = query = mandoc_strdup(req->q.query);
	for (;;) {
		while (isspace((unsigned char)*rp))
			rp++;
		if (*rp == '\0')
			break;
		argv = mandoc_reallocarray(argv, argc + 1, sizeof(char *));
		argv[argc++] = wp = rp;
		for (;;) {
			if (isspace((unsigned char)*rp)) {
				*wp = '\0';
				rp++;
				break;
			}
			if (rp[0] == '\\' && rp[1] != '\0')
				rp++;
			if (wp != rp)
				*wp = *rp;
			if (*rp == '\0')
				break;
			wp++;
			rp++;
		}
	}

	res = NULL;
	ressz = 0;
	if (req->isquery && req->q.equal && argc == 1)
		pg_redirect(req, argv[0]);
	else if (mansearch(&search, &paths, argc, argv, &res, &ressz) == 0)
		pg_noresult(req, 400, "Bad Request",
		    "You entered an invalid query.");
	else if (ressz == 0)
		pg_noresult(req, 404, "Not Found", "No results found.");
	else
		pg_searchres(req, res, ressz);

	free(query);
	mansearch_free(res, ressz);
	free(paths.paths[0]);
	free(paths.paths);
}

int
main(void)
{
	struct req	 req;
	struct itimerval itimer;
	const char	*path;
	const char	*querystring;
	int		 i;

	/*
	 * The "rpath" pledge could be revoked after mparse_readfd()
	 * if the file desciptor to "/footer.html" would be opened
	 * up front, but it's probably not worth the complication
	 * of the code it would cause: it would require scattering
	 * pledge() calls in multiple low-level resp_*() functions.
	 */

	if (pledge("stdio rpath", NULL) == -1) {
		warn("pledge");
		pg_error_internal();
		return EXIT_FAILURE;
	}

	/* Poor man's ReDoS mitigation. */

	itimer.it_value.tv_sec = 2;
	itimer.it_value.tv_usec = 0;
	itimer.it_interval.tv_sec = 2;
	itimer.it_interval.tv_usec = 0;
	if (setitimer(ITIMER_VIRTUAL, &itimer, NULL) == -1) {
		warn("setitimer");
		pg_error_internal();
		return EXIT_FAILURE;
	}

	/*
	 * First we change directory into the MAN_DIR so that
	 * subsequent scanning for manpath directories is rooted
	 * relative to the same position.
	 */

	if (chdir(MAN_DIR) == -1) {
		warn("MAN_DIR: %s", MAN_DIR);
		pg_error_internal();
		return EXIT_FAILURE;
	}

	memset(&req, 0, sizeof(struct req));
	req.q.equal = 1;
	parse_manpath_conf(&req);

	/* Parse the path info and the query string. */

	if ((path = getenv("PATH_INFO")) == NULL)
		path = "";
	else if (*path == '/')
		path++;

	if (*path != '\0') {
		parse_path_info(&req, path);
		if (req.q.manpath == NULL || req.q.sec == NULL ||
		    *req.q.query == '\0' || access(path, F_OK) == -1)
			path = "";
	} else if ((querystring = getenv("QUERY_STRING")) != NULL)
		parse_query_string(&req, querystring);

	/* Validate parsed data and add defaults. */

	if (req.q.manpath == NULL)
		req.q.manpath = mandoc_strdup(req.p[0]);
	else if ( ! validate_manpath(&req, req.q.manpath)) {
		pg_error_badrequest(
		    "You specified an invalid manpath.");
		return EXIT_FAILURE;
	}

	if (req.q.arch != NULL && validate_arch(req.q.arch) == 0) {
		pg_error_badrequest(
		    "You specified an invalid architecture.");
		return EXIT_FAILURE;
	}

	/* Dispatch to the three different pages. */

	if ('\0' != *path)
		pg_show(&req, path);
	else if (NULL != req.q.query)
		pg_search(&req);
	else
		pg_index(&req);

	free(req.q.manpath);
	free(req.q.arch);
	free(req.q.sec);
	free(req.q.query);
	for (i = 0; i < (int)req.psz; i++)
		free(req.p[i]);
	free(req.p);
	return EXIT_SUCCESS;
}

/*
 * Translate PATH_INFO to a query.
 */
static void
parse_path_info(struct req *req, const char *path)
{
	const char	*name, *sec, *end;

	req->isquery = 0;
	req->q.equal = 1;
	req->q.manpath = NULL;
	req->q.arch = NULL;

	/* Mandatory manual page name. */
	if ((name = strrchr(path, '/')) == NULL)
		name = path;
	else
		name++;

	/* Optional trailing section. */
	sec = strrchr(name, '.');
	if (sec != NULL && isdigit((unsigned char)*++sec)) {
		req->q.query = mandoc_strndup(name, sec - name - 1);
		req->q.sec = mandoc_strdup(sec);
	} else {
		req->q.query = mandoc_strdup(name);
		req->q.sec = NULL;
	}

	/* Handle the case of name[.section] only. */
	if (name == path)
		return;

	/* Optional manpath. */
	end = strchr(path, '/');
	req->q.manpath = mandoc_strndup(path, end - path);
	if (validate_manpath(req, req->q.manpath)) {
		path = end + 1;
		if (name == path)
			return;
	} else {
		free(req->q.manpath);
		req->q.manpath = NULL;
	}

	/* Optional section. */
	if (strncmp(path, "man", 3) == 0 || strncmp(path, "cat", 3) == 0) {
		path += 3;
		end = strchr(path, '/');
		free(req->q.sec);
		req->q.sec = mandoc_strndup(path, end - path);
		path = end + 1;
		if (name == path)
			return;
	}

	/* Optional architecture. */
	end = strchr(path, '/');
	if (end + 1 != name) {
		pg_error_badrequest(
		    "You specified too many directory components.");
		exit(EXIT_FAILURE);
	}
	req->q.arch = mandoc_strndup(path, end - path);
	if (validate_arch(req->q.arch) == 0) {
		pg_error_badrequest(
		    "You specified an invalid directory component.");
		exit(EXIT_FAILURE);
	}
}

/*
 * Scan for indexable paths.
 */
static void
parse_manpath_conf(struct req *req)
{
	FILE	*fp;
	char	*dp;
	size_t	 dpsz;
	ssize_t	 len;

	if ((fp = fopen("manpath.conf", "r")) == NULL) {
		warn("%s/manpath.conf", MAN_DIR);
		pg_error_internal();
		exit(EXIT_FAILURE);
	}

	dp = NULL;
	dpsz = 0;

	while ((len = getline(&dp, &dpsz, fp)) != -1) {
		if (dp[len - 1] == '\n')
			dp[--len] = '\0';
		req->p = mandoc_realloc(req->p,
		    (req->psz + 1) * sizeof(char *));
		if ( ! validate_urifrag(dp)) {
			warnx("%s/manpath.conf contains "
			    "unsafe path \"%s\"", MAN_DIR, dp);
			pg_error_internal();
			exit(EXIT_FAILURE);
		}
		if (strchr(dp, '/') != NULL) {
			warnx("%s/manpath.conf contains "
			    "path with slash \"%s\"", MAN_DIR, dp);
			pg_error_internal();
			exit(EXIT_FAILURE);
		}
		req->p[req->psz++] = dp;
		dp = NULL;
		dpsz = 0;
	}
	free(dp);

	if (req->p == NULL) {
		warnx("%s/manpath.conf is empty", MAN_DIR);
		pg_error_internal();
		exit(EXIT_FAILURE);
	}
}