===================================================================
RCS file: /cvs/mandoc/cgi.c,v
retrieving revision 1.2
retrieving revision 1.159
diff -u -p -r1.2 -r1.159
--- mandoc/cgi.c	2011/11/09 22:05:56	1.2
+++ mandoc/cgi.c	2018/10/01 08:06:53	1.159
@@ -1,311 +1,1270 @@
-/*	$Id: cgi.c,v 1.2 2011/11/09 22:05:56 kristaps Exp $ */
-#include <assert.h>
+/*	$Id: cgi.c,v 1.159 2018/10/01 08:06:53 schwarze Exp $ */
+/*
+ * Copyright (c) 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
+ * Copyright (c) 2014, 2015, 2016, 2017 Ingo Schwarze <schwarze@usta.de>
+ *
+ * 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.
+ */
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/time.h>
+
+#include <ctype.h>
+#if HAVE_ERR
+#include <err.h>
+#endif
+#include <errno.h>
 #include <fcntl.h>
-#include <regex.h>
+#include <limits.h>
+#include <stdint.h>
 #include <stdio.h>
-#include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
-#include "apropos.h"
+#include "mandoc_aux.h"
 #include "mandoc.h"
+#include "roff.h"
+#include "mdoc.h"
+#include "man.h"
+#include "main.h"
+#include "manconf.h"
+#include "mansearch.h"
+#include "cgi.h"
 
 /*
- * The page a request is trying to make.
+ * A query as passed to the search function.
  */
-enum	page {
-	PAGE_INDEX,
-	PAGE_SEARCH,
-	PAGE__MAX
+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 */
 };
 
-/*
- * Key-value pair.  
- * Both key and val are on the heap.
- */
-struct	kval {
-	char		*key;
-	char		*val;
+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 */
 };
 
-/*
- * The media type, determined by suffix, of the requesting or responding
- * context.
- */
-enum	media {
-	MEDIA_HTML,
-	MEDIA__MAX
+enum	focus {
+	FOCUS_NONE = 0,
+	FOCUS_QUERY
 };
 
-/*
- * An HTTP request.
- */
-struct	req {
-	struct kval	*fields; /* query fields */
-	size_t		 fieldsz;
-	enum media	 media;
-	enum page	 page;
-};
+static	void		 html_print(const char *);
+static	void		 html_putchar(char);
+static	int		 http_decode(char *);
+static	void		 http_encode(const char *p);
+static	void		 parse_manpath_conf(struct req *);
+static	void		 parse_path_info(struct req *req, const char *path);
+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 *, 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 *);
 
-#if 0
-static	void		 html_printtext(const char *);
-#endif
-static	int 		 kval_decode(char *);
-static	void		 kval_parse(struct kval **, size_t *, char *);
-static	void		 kval_free(struct kval *, size_t);
-static	void		 pg_index(const struct req *, char *);
-static	void		 pg_search(const struct req *, char *);
-#if 0
-static	void		 pg_searchres(struct rec *, size_t, void *);
-#endif
+static	const char	 *scriptname = SCRIPT_NAME;
 
-static	const char * const pages[PAGE__MAX] = {
-	"index", /* PAGE_INDEX */ 
-	"search", /* PAGE_SEARCH */
+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 medias[MEDIA__MAX] = {
-	"html", /* MEDIA_HTML */
+static	const char *const arch_names[] = {
+    "amd64",       "alpha",       "armv7",	"arm64",
+    "hppa",        "i386",        "landisk",
+    "loongson",    "luna88k",     "macppc",      "mips64",
+    "octeon",      "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 *);
 
-#if 0
+/*
+ * Print a character, escaping HTML along the way.
+ * This will pass non-ASCII straight to output: be warned!
+ */
 static void
-html_printtext(const char *p)
+html_putchar(char c)
 {
-	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)
-		switch ((c = *p++)) {
-		case ('"'):
-			printf("&quote;");
-			break;
-		case ('&'):
-			printf("&amp;");
-			break;
-		case ('>'):
-			printf("&gt;");
-			break;
-		case ('<'):
-			printf("&lt;");
-			break;
-		default:
-			putchar((unsigned char)c);
-			break;
-		}
+		html_putchar(*p++);
 }
-#endif
 
+/*
+ * Transfer the responsibility for the allocated string *val
+ * to the query structure.
+ */
 static void
-kval_free(struct kval *p, size_t sz)
+set_query_attr(char **attr, char **val)
 {
-	int		 i;
 
-	for (i = 0; i < (int)sz; i++) {
-		free(p[i].key);
-		free(p[i].val);
-	}
-	free(p);
+	free(*attr);
+	if (**val == '\0') {
+		*attr = NULL;
+		free(*val);
+	} else
+		*attr = *val;
+	*val = NULL;
 }
 
 /*
- * Parse out key-value pairs from an HTTP request variable.
- * This can be either a cookie or a POST/GET string.
+ * Parse the QUERY_STRING for key-value pairs
+ * and store the values into the query structure.
  */
 static void
-kval_parse(struct kval **kv, size_t *kvsz, char *p)
+parse_query_string(struct req *req, const char *qs)
 {
-	char            *key, *val;
-	size_t           sz, cur;
+	char		*key, *val;
+	size_t		 keysz, valsz;
 
-	cur = 0;
+	req->isquery	= 1;
+	req->q.manpath	= NULL;
+	req->q.arch	= NULL;
+	req->q.sec	= NULL;
+	req->q.query	= NULL;
+	req->q.equal	= 1;
 
-	while (p && '\0' != *p) {
-		while (' ' == *p)
-			p++;
+	key = val = NULL;
+	while (*qs != '\0') {
 
-		key = p;
-		val = NULL;
+		/* Parse one key. */
 
-		if (NULL != (p = strchr(p, '='))) {
-			*p++ = '\0';
-			val = p;
+		keysz = strcspn(qs, "=;&");
+		key = mandoc_strndup(qs, keysz);
+		qs += keysz;
+		if (*qs != '=')
+			goto next;
 
-			sz = strcspn(p, ";&");
-			/* LINTED */
-			p += sz;
+		/* Parse one value. */
 
-			if ('\0' != *p)
-				*p++ = '\0';
-		} else {
-			p = key;
-			sz = strcspn(p, ";&");
-			/* LINTED */
-			p += sz;
+		valsz = strcspn(++qs, ";&");
+		val = mandoc_strndup(qs, valsz);
+		qs += valsz;
 
-			if ('\0' != *p)
-				p++;
-			continue;
-		}
+		/* Decode and catch encoding errors. */
 
-		if ('\0' == *key || '\0' == *val)
-			continue;
+		if ( ! (http_decode(key) && http_decode(val)))
+			goto next;
 
-		/* Just abort handling. */
+		/* Handle key-value pairs. */
 
-		if ( ! kval_decode(key))
-			return;
-		if ( ! kval_decode(val))
-			return;
+		if ( ! strcmp(key, "query"))
+			set_query_attr(&req->q.query, &val);
 
-		if (*kvsz + 1 >= cur) {
-			cur++;
-			*kv = mandoc_realloc
-				(*kv, cur * sizeof(struct kval));
+		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);
 		}
 
-		(*kv)[(int)*kvsz].key = mandoc_strdup(key);
-		(*kv)[(int)*kvsz].val = mandoc_strdup(val);
-		(*kvsz)++;
+		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++;
 	}
 }
 
 /*
- * In-place 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.
+ * 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
-kval_decode(char *p)
+http_decode(char *p)
 {
 	char             hex[3];
+	char		*q;
 	int              c;
 
 	hex[2] = '\0';
 
-	for ( ; '\0' != *p; p++) {
+	q = p;
+	for ( ; '\0' != *p; p++, q++) {
 		if ('%' == *p) {
 			if ('\0' == (hex[0] = *(p + 1)))
-				return(0);
+				return 0;
 			if ('\0' == (hex[1] = *(p + 2)))
-				return(0);
+				return 0;
 			if (1 != sscanf(hex, "%x", &c))
-				return(0);
+				return 0;
 			if ('\0' == c)
-				return(0);
+				return 0;
 
-			*p = (char)c;
-			memmove(p + 1, p + 3, strlen(p + 3) + 1);
+			*q = (char)c;
+			p += 2;
 		} else
-			*p = '+' == *p ? ' ' : *p;
+			*q = '+' == *p ? ' ' : *p;
 	}
 
-	*p = '\0';
-	return(1);
+	*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("%%%02.2X", (unsigned char)*p);
+		else
+			putchar(*p);
+	}
+}
 
-/* ARGSUSED */
 static void
-pg_index(const struct req *req, char *path)
+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"
+	     "Pragma: no-cache\r\n"
+	     "\r\n");
+
+	fflush(stdout);
 }
 
-#if 0
 static void
-pg_searchres(struct rec *recs, size_t sz, void *arg)
+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;
-	const char	*pg;
 
-	if (NULL == (pg = getenv("SCRIPT_NAME")))
-		pg = "";
+	printf("<form action=\"/%s\" method=\"get\">\n"
+	       "  <fieldset>\n"
+	       "    <legend>Manual Page Search Parameters</legend>\n",
+	       scriptname);
 
-	for (i = 0; i < (int)sz; i++) {
-		printf("<A HREF=\"%s/show/%u.html\">", 
-				pg, recs[i].rec);
-		html_printtext(recs[i].title);
-		putchar('(');
-		html_printtext(recs[i].cat);
-		puts(")</A>");
+	/* 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>");
 }
-#endif
 
+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_search(const struct req *req, char *path)
+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, const char *msg)
+{
+	resp_begin_html(200, NULL, NULL);
+	resp_searchform(req, FOCUS_QUERY);
+	puts("<p>");
+	puts(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;
-	struct opts	 opt;
+	int		 italic, bold;
 
-	for (i = 0; i < (int)req->fieldsz; i++)
-		if (0 == strcmp(req->fields[i].key, "key"))
-			break;
+	if ((f = fopen(file, "r")) == NULL) {
+		puts("<p>You specified an invalid manual file.</p>");
+		return;
+	}
 
-	if (i == (int)req->fieldsz)
+	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_man	*man;
+	void		*vp;
+	int		 fd;
+	int		 usepath;
+
+	if (-1 == (fd = open(file, O_RDONLY, 0))) {
+		puts("<p>You specified an invalid manual file.</p>");
 		return;
+	}
 
-	memset(&opt, 0, sizeof(struct opts));
-	/*opt.types = TYPE_NAME | TYPE_DESC;
-	apropos_search(&opt, req->fields[i].val, NULL, pg_searchres);*/
+	mchars_alloc();
+	mp = mparse_alloc(MPARSE_SO | MPARSE_UTF8 | MPARSE_LATIN1,
+	    MANDOCERR_MAX, NULL, MANDOC_OS_OTHER, req->q.manpath);
+	mparse_readfd(mp, fd, file);
+	close(fd);
+
+	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 ? "/" : "");
+
+	mparse_result(mp, &man, NULL);
+	if (man == NULL) {
+		warnx("fatal mandoc error: %s/%s", req->q.manpath, file);
+		pg_error_internal();
+		mparse_free(mp);
+		mchars_free();
+		return;
+	}
+
+	vp = html_alloc(&conf);
+
+	if (man->macroset == MACROSET_MDOC) {
+		mdoc_validate(man);
+		html_mdoc(vp, man);
+	} else {
+		man_validate(man);
+		html_man(vp, man);
+	}
+
+	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, "You entered an invalid query.");
+	else if (ressz == 0)
+		pg_noresult(req, "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)
 {
-	int		 i;
 	struct req	 req;
-	char		*p;
-	char		*path, *subpath, *suffix;
+	struct itimerval itimer;
+	const char	*path;
+	const char	*querystring;
+	int		 i;
 
+#if HAVE_PLEDGE
+	/*
+	 * 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;
+	}
+#endif
+
+	/* 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);
 
-	if (NULL != (p = getenv("QUERY_STRING")))
-		kval_parse(&req.fields, &req.fieldsz, p);
+	/* Parse the path info and the query string. */
 
-	suffix = subpath = path = NULL;
+	if ((path = getenv("PATH_INFO")) == NULL)
+		path = "";
+	else if (*path == '/')
+		path++;
 
-	req.media = MEDIA_HTML;
-	req.page = PAGE__MAX;
+	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);
 
-	if (NULL == (path = getenv("PATH_INFO")) || '\0' == *path)
-		req.page = PAGE_INDEX;
-	if (NULL != path && '/' == *path && '\0' == *++path)
-		req.page = PAGE_INDEX;
+	/* Validate parsed data and add defaults. */
 
-	if (NULL != path && NULL != (suffix = strrchr(path, '.')))
-		if (NULL != suffix && NULL == strchr(suffix, '/'))
-			*suffix++ = '\0';
+	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 (NULL != path && NULL != (subpath = strchr(path, '/')))
-			*subpath++ = '\0';
+	if (req.q.arch != NULL && validate_arch(req.q.arch) == 0) {
+		pg_error_badrequest(
+		    "You specified an invalid architecture.");
+		return EXIT_FAILURE;
+	}
 
-	if (NULL != suffix && '\0' != *suffix)
-		for (i = 0; i < (int)MEDIA__MAX; i++)
-			if (0 == strcmp(medias[i], suffix)) {
-				req.media = (enum media)i;
-				break;
-			}
+	/* Dispatch to the three different pages. */
 
-	if (NULL != path && '\0' != *path)
-		for (i = 0; i < (int)PAGE__MAX; i++) 
-			if (0 == strcmp(pages[i], path)) {
-				req.page = (enum page)i;
-				break;
-			}
+	if ('\0' != *path)
+		pg_show(&req, path);
+	else if (NULL != req.q.query)
+		pg_search(&req);
+	else
+		pg_index(&req);
 
-	switch (req.page) {
-	case (PAGE_INDEX):
-		pg_index(&req, subpath);
-		break;
-	case (PAGE_SEARCH):
-		pg_search(&req, subpath);
-		break;
-	default:
-		/* Blah */
-		break;
+	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;
+}
+
+/*
+ * If PATH_INFO is not a file name, translate it to a query.
+ */
+static void
+parse_path_info(struct req *req, const char *path)
+{
+	char	*dir[4];
+	int	 i;
+
+	req->isquery = 0;
+	req->q.equal = 1;
+	req->q.manpath = mandoc_strdup(path);
+	req->q.arch = NULL;
+
+	/* Mandatory manual page name. */
+	if ((req->q.query = strrchr(req->q.manpath, '/')) == NULL) {
+		req->q.query = req->q.manpath;
+		req->q.manpath = NULL;
+	} else
+		*req->q.query++ = '\0';
+
+	/* Optional trailing section. */
+	if ((req->q.sec = strrchr(req->q.query, '.')) != NULL) {
+		if(isdigit((unsigned char)req->q.sec[1])) {
+			*req->q.sec++ = '\0';
+			req->q.sec = mandoc_strdup(req->q.sec);
+		} else
+			req->q.sec = NULL;
 	}
 
-	kval_free(req.fields, req.fieldsz);
-	return(EXIT_SUCCESS);
+	/* Handle the case of name[.section] only. */
+	if (req->q.manpath == NULL)
+		return;
+	req->q.query = mandoc_strdup(req->q.query);
+
+	/* Split directory components. */
+	dir[i = 0] = req->q.manpath;
+	while ((dir[i + 1] = strchr(dir[i], '/')) != NULL) {
+		if (++i == 3) {
+			pg_error_badrequest(
+			    "You specified too many directory components.");
+			exit(EXIT_FAILURE);
+		}
+		*dir[i]++ = '\0';
+	}
+
+	/* Optional manpath. */
+	if ((i = validate_manpath(req, req->q.manpath)) == 0)
+		req->q.manpath = NULL;
+	else if (dir[1] == NULL)
+		return;
+
+	/* Optional section. */
+	if (strncmp(dir[i], "man", 3) == 0) {
+		free(req->q.sec);
+		req->q.sec = mandoc_strdup(dir[i++] + 3);
+	}
+	if (dir[i] == NULL) {
+		if (req->q.manpath == NULL)
+			free(dir[0]);
+		return;
+	}
+	if (dir[i + 1] != NULL) {
+		pg_error_badrequest(
+		    "You specified an invalid directory component.");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Optional architecture. */
+	if (i) {
+		req->q.arch = mandoc_strdup(dir[i]);
+		if (req->q.manpath == NULL)
+			free(dir[0]);
+	} else
+		req->q.arch = dir[0];
+}
+
+/*
+ * 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);
+	}
 }