X-Git-Url: https://git.cameronkatri.com/mandoc.git/blobdiff_plain/ea48e55b5108c43c1f8c8c5e6e85758eb4ed5ae0..db42cb7f0b926817aff8c41cac4ad993a3db85aa:/cgi.c

diff --git a/cgi.c b/cgi.c
index e20ad201..6d0e3293 100644
--- a/cgi.c
+++ b/cgi.c
@@ -1,102 +1,141 @@
-/*	$Id: cgi.c,v 1.60 2014/07/09 17:03:07 schwarze Exp $ */
+/* $Id: cgi.c,v 1.172 2020/04/03 11:35:01 schwarze Exp $ */
 /*
+ * Copyright (c) 2014-2019 Ingo Schwarze <schwarze@usta.de>
  * Copyright (c) 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2014 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 AUTHOR DISCLAIMS ALL WARRANTIES
+ * 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 AUTHOR BE LIABLE FOR
+ * 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.
  */
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
+
+#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 <limits.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
-#include "mandoc.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 "manpath.h"
+#include "manconf.h"
 #include "mansearch.h"
-
-enum	page {
-	PAGE_INDEX,
-	PAGE_SEARCH,
-	PAGE_SHOW,
-	PAGE__MAX
-};
+#include "cgi.h"
 
 /*
  * A query as passed to the search function.
  */
 struct	query {
-	const char	*manpath; /* desired manual directory */
-	const char	*arch; /* architecture */
-	const char	*sec; /* manual section */
-	const char	*expr; /* unparsed expression string */
-	int		 legacy; /* whether legacy mode */
+	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 */
-	enum page	  page;
+	int		  isquery; /* QUERY_STRING used, not PATH_INFO */
+};
+
+enum	focus {
+	FOCUS_NONE = 0,
+	FOCUS_QUERY
 };
 
-static	void		 catman(const struct req *, const char *);
-static	int	 	 cmp(const void *, const void *);
-static	void		 format(const struct req *, const char *);
 static	void		 html_print(const char *);
-static	void		 html_printquery(const struct req *);
 static	void		 html_putchar(char);
-static	int 		 http_decode(char *);
-static	void		 http_parse(struct req *, char *);
-static	void		 http_print(const char *);
-static	void 		 http_putchar(char);
-static	void		 http_printquery(const struct req *);
-static	void		 pathgen(struct req *);
-static	void		 pg_index(const struct req *, char *);
-static	void		 pg_search(const struct req *, char *);
-static	void		 pg_show(const struct req *, char *);
-static	void		 resp_begin_html(int, const char *);
-static	void		 resp_begin_http(int, const char *);
-static	void		 resp_end_html(void);
-static	void		 resp_error_badrequest(const char *);
-static	void		 resp_error_internal(void);
-static	void		 resp_error_notfound(const char *);
-static	void		 resp_index(const struct req *);
-static	void		 resp_noresult(const struct req *,
+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		 resp_search(const struct req *,
+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		 resp_searchform(const struct req *);
-
-static	const char	 *scriptname; /* CGI script name */
-static	const char	 *mandir; /* contains all manpath directories */
-static	const char	 *cssdir; /* css directory */
-static	const char	 *httphost; /* hostname used in the URIs */
-
-static	const char * const pages[PAGE__MAX] = {
-	"index", /* PAGE_INDEX */ 
-	"search", /* PAGE_SEARCH */
-	"show", /* PAGE_SHOW */
+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",      "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.
@@ -107,16 +146,16 @@ html_putchar(char c)
 {
 
 	switch (c) {
-	case ('"'):
-		printf("&quote;");
+	case '"':
+		printf("&quot;");
 		break;
-	case ('&'):
+	case '&':
 		printf("&amp;");
 		break;
-	case ('>'):
+	case '>':
 		printf("&gt;");
 		break;
-	case ('<'):
+	case '<':
 		printf("&lt;");
 		break;
 	default:
@@ -125,154 +164,125 @@ html_putchar(char c)
 	}
 }
 
+/*
+ * Call through to html_putchar().
+ * Accepts NULL strings.
+ */
 static void
-http_printquery(const struct req *req)
-{
-
-	if (NULL != req->q.manpath) {
-		printf("&manpath=");
-		http_print(req->q.manpath);
-	}
-	if (NULL != req->q.sec) {
-		printf("&sec=");
-		http_print(req->q.sec);
-	}
-	if (NULL != req->q.arch) {
-		printf("&arch=");
-		http_print(req->q.arch);
-	}
-	if (NULL != req->q.expr) {
-		printf("&expr=");
-		http_print(req->q.expr ? req->q.expr : "");
-	}
-}
-
-static void
-html_printquery(const struct req *req)
-{
-
-	if (NULL != req->q.manpath) {
-		printf("&amp;manpath=");
-		html_print(req->q.manpath);
-	}
-	if (NULL != req->q.sec) {
-		printf("&amp;sec=");
-		html_print(req->q.sec);
-	}
-	if (NULL != req->q.arch) {
-		printf("&amp;arch=");
-		html_print(req->q.arch);
-	}
-	if (NULL != req->q.expr) {
-		printf("&amp;expr=");
-		html_print(req->q.expr ? req->q.expr : "");
-	}
-}
-
-static void
-http_print(const char *p)
+html_print(const char *p)
 {
 
 	if (NULL == p)
 		return;
 	while ('\0' != *p)
-		http_putchar(*p++);
+		html_putchar(*p++);
 }
 
 /*
- * Call through to html_putchar().
- * Accepts NULL strings.
+ * Transfer the responsibility for the allocated string *val
+ * to the query structure.
  */
 static void
-html_print(const char *p)
+set_query_attr(char **attr, char **val)
 {
-	
-	if (NULL == p)
-		return;
-	while ('\0' != *p)
-		html_putchar(*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, although man.cgi
- * uses only GET for simplicity.
+ * Parse the QUERY_STRING for key-value pairs
+ * and store the values into the query structure.
  */
 static void
-http_parse(struct req *req, char *p)
+parse_query_string(struct req *req, const char *qs)
 {
-	char            *key, *val;
-	int		 legacy;
+	char		*key, *val;
+	size_t		 keysz, valsz;
 
-	memset(&req->q, 0, sizeof(struct query));
-	req->q.manpath = req->p[0];
+	req->isquery	= 1;
+	req->q.manpath	= NULL;
+	req->q.arch	= NULL;
+	req->q.sec	= NULL;
+	req->q.query	= NULL;
+	req->q.equal	= 1;
 
-	legacy = -1;
-	while ('\0' != *p) {
-		key = p;
-		val = NULL;
+	key = val = NULL;
+	while (*qs != '\0') {
 
-		p += (int)strcspn(p, ";&");
-		if ('\0' != *p)
-			*p++ = '\0';
-		if (NULL != (val = strchr(key, '=')))
-			*val++ = '\0';
+		/* Parse one key. */
 
-		if ('\0' == *key || NULL == val || '\0' == *val)
-			continue;
+		keysz = strcspn(qs, "=;&");
+		key = mandoc_strndup(qs, keysz);
+		qs += keysz;
+		if (*qs != '=')
+			goto next;
 
-		/* Just abort handling. */
+		/* Parse one value. */
 
-		if ( ! http_decode(key))
-			break;
-		if (NULL != val && ! http_decode(val))
-			break;
+		valsz = strcspn(++qs, ";&");
+		val = mandoc_strndup(qs, valsz);
+		qs += valsz;
 
-		if (0 == strcmp(key, "expr"))
-			req->q.expr = val;
-		else if (0 == strcmp(key, "query"))
-			req->q.expr = val;
-		else if (0 == strcmp(key, "sec"))
-			req->q.sec = val;
-		else if (0 == strcmp(key, "sektion"))
-			req->q.sec = val;
-		else if (0 == strcmp(key, "arch"))
-			req->q.arch = val;
-		else if (0 == strcmp(key, "manpath"))
-			req->q.manpath = val;
-		else if (0 == strcmp(key, "apropos"))
-			legacy = 0 == strcmp(val, "0");
-	}
-
-	/* Test for old man.cgi compatibility mode. */
-
-	req->q.legacy = legacy > 0;
-
-	/* 
-	 * Section "0" means no section when in legacy mode.
-	 * For some man.cgi scripts, "default" arch is none.
-	 */
+		/* Decode and catch encoding errors. */
 
-	if (req->q.legacy && NULL != req->q.sec)
-		if (0 == strcmp(req->q.sec, "0"))
-			req->q.sec = NULL;
-	if (req->q.legacy && NULL != req->q.arch)
-		if (0 == strcmp(req->q.arch, "default"))
-			req->q.arch = NULL;
-}
+		if ( ! (http_decode(key) && http_decode(val)))
+			goto next;
 
-static void
-http_putchar(char c)
-{
+		/* Handle key-value pairs. */
 
-	if (isalnum((unsigned char)c)) {
-		putchar((unsigned char)c);
-		return;
-	} else if (' ' == c) {
-		putchar('+');
-		return;
+		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++;
 	}
-	printf("%%%.2x", c);
 }
 
 /*
@@ -284,29 +294,43 @@ static int
 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("%%%2.2X", (unsigned char)*p);
+		else
+			putchar(*p);
+	}
 }
 
 static void
@@ -314,242 +338,407 @@ resp_begin_http(int code, const char *msg)
 {
 
 	if (200 != code)
-		printf("Status: %d %s\n", code, msg);
+		printf("Status: %d %s\r\n", code, msg);
 
-	puts("Content-Type: text/html; charset=utf-8\n"
-	     "Cache-Control: no-cache\n"
-	     "Pragma: no-cache\n"
-	     "");
+	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_begin_html(int code, const char *msg)
+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 PUBLIC "
-	       " \"-//W3C//DTD HTML 4.01//EN\""
-	       " \"http://www.w3.org/TR/html4/strict.dtd\">\n"
-	       "<HTML>\n"
-	       "<HEAD>\n"
-	       "<META HTTP-EQUIV=\"Content-Type\""
-	       " CONTENT=\"text/html; charset=utf-8\">\n"
-	       "<LINK REL=\"stylesheet\" HREF=\"%s/man-cgi.css\""
-	       " TYPE=\"text/css\" media=\"all\">\n"
-	       "<LINK REL=\"stylesheet\" HREF=\"%s/man.css\""
-	       " TYPE=\"text/css\" media=\"all\">\n"
-	       "<TITLE>System Manpage Reference</TITLE>\n"
-	       "</HEAD>\n"
-	       "<BODY>\n"
-	       "<!-- Begin page content. //-->\n",
-	       cssdir, cssdir);
+	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)
 {
 
-	puts("</BODY>\n"
-	     "</HTML>");
+	resp_copy(MAN_DIR "/footer.html");
+
+	puts("</body>\n"
+	     "</html>");
 }
 
 static void
-resp_searchform(const struct req *req)
+resp_searchform(const struct req *req, enum focus focus)
 {
 	int		 i;
 
-	puts("<!-- Begin search form. //-->");
-	printf("<DIV ID=\"mancgi\">\n"
-	       "<FORM ACTION=\"%s/search\" METHOD=\"get\">\n"
-	       "<FIELDSET>\n"
-	       "<LEGEND>Search Parameters</LEGEND>\n"
-	       "<INPUT TYPE=\"submit\" "
-	       " VALUE=\"Search\"> for manuals satisfying \n"
-	       "<INPUT TYPE=\"text\" NAME=\"expr\" VALUE=\"",
+	printf("<form action=\"/%s\" method=\"get\" "
+	       "autocomplete=\"off\" autocapitalize=\"none\">\n"
+	       "  <fieldset>\n"
+	       "    <legend>Manual Page Search Parameters</legend>\n",
 	       scriptname);
-	html_print(req->q.expr ? req->q.expr : "");
-	printf("\">, section "
-	       "<INPUT TYPE=\"text\""
-	       " SIZE=\"4\" NAME=\"sec\" VALUE=\"");
-	html_print(req->q.sec ? req->q.sec : "");
-	printf("\">, arch "
-	       "<INPUT TYPE=\"text\""
-	       " SIZE=\"8\" NAME=\"arch\" VALUE=\"");
-	html_print(req->q.arch ? req->q.arch : "");
-	printf("\">");
+
+	/* 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(", in <SELECT NAME=\"manpath\">");
+		puts("    <select name=\"manpath\">");
 		for (i = 0; i < (int)req->psz; i++) {
-			printf("<OPTION ");
-			if (NULL == req->q.manpath ? 0 == i :
-			    0 == strcmp(req->q.manpath, req->p[i]))
-				printf("SELECTED=\"selected\" ");
-			printf("VALUE=\"");
+			printf("      <option");
+			if (strcmp(req->q.manpath, req->p[i]) == 0)
+				printf(" selected=\"selected\"");
+			printf(">");
 			html_print(req->p[i]);
-			printf("\">");
-			html_print(req->p[i]);
-			puts("</OPTION>");
+			puts("</option>");
 		}
-		puts("</SELECT>");
-	}
-	puts("&mdash;\n"
-	     "<INPUT TYPE=\"reset\" VALUE=\"Reset\">\n"
-	     "</FIELDSET>\n"
-	     "</FORM>\n"
-	     "</DIV>");
-	puts("<!-- End search form. //-->");
+		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
-resp_index(const struct req *req)
+pg_index(const struct req *req)
 {
 
-	resp_begin_html(200, NULL);
-	puts("<H1>\n"
-	     "Online manuals with "
-	     "<A HREF=\"http://mdocml.bsd.lv/\">mandoc</A>\n"
-	     "</H1>");
-	resp_searchform(req);
-	puts("<P>\n"
-	     "The <A HREF=\"search?expr=Nm~^apropos$&amp;sec=1\">"
-	     "apropos</A> manual explains the query syntax.\n"
-	     "</P>");
+	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
-resp_noresult(const struct req *req, const char *msg)
+pg_noresult(const struct req *req, int code, const char *http_msg,
+    const char *user_msg)
 {
-	resp_begin_html(200, NULL);
-	resp_searchform(req);
-	puts("<P>");
-	puts(msg);
-	puts("</P>");
+	resp_begin_html(code, http_msg, NULL);
+	resp_searchform(req, FOCUS_QUERY);
+	puts("<p>");
+	puts(user_msg);
+	puts("</p>");
 	resp_end_html();
 }
 
 static void
-resp_error_badrequest(const char *msg)
+pg_error_badrequest(const char *msg)
 {
 
-	resp_begin_html(400, "Bad Request");
-	puts("<H1>Bad Request</H1>\n"
-	     "<P>\n");
+	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);
+	       "<a href=\"/%s\">main page</a>.\n"
+	       "</p>", scriptname);
 	resp_end_html();
 }
 
 static void
-resp_error_notfound(const char *page)
+pg_error_internal(void)
 {
-
-	resp_begin_html(404, "Not Found");
-	puts("<H1>Page Not Found</H1>\n"
-	     "<P>\n"
-	     "The page you're looking for, ");
-	printf("<B>");
-	html_print(page);
-	printf("</B>,\n"
-	       "could not be found.\n"
-	       "Try searching from the\n"
-	       "<A HREF=\"%s\">main page</A>.\n"
-	       "</P>", scriptname);
+	resp_begin_html(500, "Internal Server Error", NULL);
+	puts("<p>Internal Server Error</p>");
 	resp_end_html();
 }
 
 static void
-resp_error_internal(void)
+pg_redirect(const struct req *req, const char *name)
 {
-	resp_begin_html(500, "Internal Server Error");
-	puts("<P>Internal Server Error</P>");
-	resp_end_html();
+	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
-resp_search(const struct req *req, struct manpage *r, size_t sz)
+pg_searchres(const struct req *req, struct manpage *r, size_t sz)
 {
-	size_t		 i;
+	char		*arch, *archend;
+	const char	*sec;
+	size_t		 i, iuse;
+	int		 archprio, archpriouse;
+	int		 prio, priouse;
 
-	if (1 == sz) {
+	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.
 		 */
-		puts("Status: 303 See Other");
-		printf("Location: http://%s%s/show/%s/%s?",
-		    httphost, scriptname, req->q.manpath, r[0].file);
-		http_printquery(req);
-		puts("\n"
-		     "Content-Type: text/html; charset=utf-8\n");
+		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;
 	}
 
-	qsort(r, sz, sizeof(struct manpage), cmp);
-
-	resp_begin_html(200, NULL);
-	resp_searchform(req);
-	puts("<DIV CLASS=\"results\">");
-	puts("<TABLE>");
+	/*
+	 * In man(1) mode, show one of the pages
+	 * even if more than one is found.
+	 */
 
-	for (i = 0; i < sz; i++) {
-		printf("<TR>\n"
-		       "<TD CLASS=\"title\">\n"
-		       "<A HREF=\"%s/show/%s/%s?", 
-		    scriptname, req->q.manpath, r[i].file);
-		html_printquery(req);
-		printf("\">");
-		html_print(r[i].names);
-		printf("</A>\n"
-		       "</TD>\n"
-		       "<TD CLASS=\"desc\">");
-		html_print(r[i].output);
-		puts("</TD>\n"
-		     "</TR>");
-	}
-
-	puts("</TABLE>\n"
-	     "</DIV>");
-	resp_end_html();
-}
+	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>");
+	}
 
-/* ARGSUSED */
-static void
-pg_index(const struct req *req, char *path)
-{
+	if (req->q.equal || sz == 1) {
+		puts("<hr>");
+		resp_show(req, r[iuse].file);
+	}
 
-	resp_index(req);
+	resp_end_html();
 }
 
 static void
-catman(const struct req *req, const char *file)
+resp_catman(const struct req *req, const char *file)
 {
 	FILE		*f;
-	size_t		 len;
-	int		 i;
 	char		*p;
+	size_t		 sz;
+	ssize_t		 len;
+	int		 i;
 	int		 italic, bold;
 
-	if (NULL == (f = fopen(file, "r"))) {
-		resp_error_badrequest(
-		    "You specified an invalid manual file.");
+	if ((f = fopen(file, "r")) == NULL) {
+		puts("<p>You specified an invalid manual file.</p>");
 		return;
 	}
 
-	resp_begin_html(200, NULL);
-	resp_searchform(req);
-	puts("<DIV CLASS=\"catman\">\n"
-	     "<PRE>");
+	puts("<div class=\"catman\">\n"
+	     "<pre>");
 
-	while (NULL != (p = fgetln(f, &len))) {
+	p = NULL;
+	sz = 0;
+
+	while ((len = getline(&p, &sz, f)) != -1) {
 		bold = italic = 0;
-		for (i = 0; i < (int)len - 1; i++) {
-			/* 
+		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).
@@ -567,22 +756,22 @@ catman(const struct req *req, const char *file)
 
 			if ('\b' != p[i + 1]) {
 				if (italic)
-					printf("</I>");
+					printf("</i>");
 				if (bold)
-					printf("</B>");
+					printf("</b>");
 				italic = bold = 0;
 				html_putchar(p[i]);
 				continue;
-			} else if (i + 2 >= (int)len)
+			} else if (i + 2 >= len)
 				continue;
 
 			/* Italic mode. */
 
 			if ('_' == p[i]) {
 				if (bold)
-					printf("</B>");
+					printf("</b>");
 				if ( ! italic)
-					printf("<I>");
+					printf("<i>");
 				bold = 0;
 				italic = 1;
 				i += 2;
@@ -590,7 +779,7 @@ catman(const struct req *req, const char *file)
 				continue;
 			}
 
-			/* 
+			/*
 			 * Handle funny behaviour troff-isms.
 			 * These grok'd from the original man2html.c.
 			 */
@@ -604,9 +793,9 @@ catman(const struct req *req, const char *file)
 					('*' == p[i] && '|' == p[i + 2]) ||
 					('|' == p[i] && '*' == p[i + 2]))  {
 				if (italic)
-					printf("</I>");
+					printf("</i>");
 				if (bold)
-					printf("</B>");
+					printf("</b>");
 				italic = bold = 0;
 				putchar('*');
 				i += 2;
@@ -618,9 +807,9 @@ catman(const struct req *req, const char *file)
 					('+' == p[i] && '|' == p[i + 1]) ||
 					('|' == p[i] && '+' == p[i + 1]))  {
 				if (italic)
-					printf("</I>");
+					printf("</i>");
 				if (bold)
-					printf("</B>");
+					printf("</b>");
 				italic = bold = 0;
 				putchar('+');
 				i += 2;
@@ -628,111 +817,116 @@ catman(const struct req *req, const char *file)
 			}
 
 			/* Bold mode. */
-			
+
 			if (italic)
-				printf("</I>");
+				printf("</i>");
 			if ( ! bold)
-				printf("<B>");
+				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. 
+		 * We can get to a newline; don't print that.
 		 */
 
 		if (italic)
-			printf("</I>");
+			printf("</i>");
 		if (bold)
-			printf("</B>");
+			printf("</b>");
 
-		if (i == (int)len - 1 && '\n' != p[i])
+		if (i == len - 1 && p[i] != '\n')
 			html_putchar(p[i]);
 
 		putchar('\n');
 	}
+	free(p);
 
-	puts("</PRE>\n"
-	     "</DIV>\n"
-	     "</BODY>\n"
-	     "</HTML>");
+	puts("</pre>\n"
+	     "</div>");
 
 	fclose(f);
 }
 
 static void
-format(const struct req *req, const char *file)
+resp_format(const struct req *req, const char *file)
 {
+	struct manoutput conf;
 	struct mparse	*mp;
-	int		 fd;
-	struct mdoc	*mdoc;
-	struct man	*man;
+	struct roff_meta *meta;
 	void		*vp;
-	enum mandoclevel rc;
-	char		 opts[PATH_MAX + 128];
+	int		 fd;
+	int		 usepath;
 
 	if (-1 == (fd = open(file, O_RDONLY, 0))) {
-		resp_error_badrequest(
-		    "You specified an invalid manual file.");
+		puts("<p>You specified an invalid manual file.</p>");
 		return;
 	}
 
-	mp = mparse_alloc(MPARSE_SO, MANDOCLEVEL_FATAL, NULL,
-	    req->q.manpath);
-	rc = mparse_readfd(mp, fd, file);
+	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);
 
-	if (rc >= MANDOCLEVEL_FATAL) {
-		fprintf(stderr, "fatal mandoc error: %s/%s\n",
-		    req->q.manpath, file);
-		resp_error_internal();
-		return;
-	}
-
-	snprintf(opts, sizeof(opts),
-	    "fragment,man=%s/search?sec=%%S&expr=Nm~^%%N$",
-	    scriptname);
-
-	mparse_result(mp, &mdoc, &man, NULL);
-	if (NULL == man && NULL == mdoc) {
-		fprintf(stderr, "fatal mandoc error: %s/%s\n",
-		    req->q.manpath, file);
-		resp_error_internal();
-		mparse_free(mp);
-		return;
-	}
+	html_free(vp);
+	mparse_free(mp);
+	mchars_free();
+	free(conf.man);
+	free(conf.style);
+}
 
-	resp_begin_html(200, NULL);
-	resp_searchform(req);
+static void
+resp_show(const struct req *req, const char *file)
+{
 
-	vp = html_alloc(opts);
+	if ('.' == file[0] && '/' == file[1])
+		file += 2;
 
-	if (NULL != mdoc)
-		html_mdoc(vp, mdoc);
+	if ('c' == *file)
+		resp_catman(req, file);
 	else
-		html_man(vp, man);
-
-	puts("</BODY>\n"
-	     "</HTML>");
-
-	html_free(vp);
-	mparse_free(mp);
+		resp_format(req, file);
 }
 
 static void
-pg_show(const struct req *req, char *path)
+pg_show(struct req *req, const char *fullpath)
 {
-	char		*sub;
+	char		*manpath;
+	const char	*file;
 
-	if (NULL == path || NULL == (sub = strchr(path, '/'))) {
-		resp_error_badrequest(
+	if ((file = strchr(fullpath, '/')) == NULL) {
+		pg_error_badrequest(
 		    "You did not specify a page to show.");
 		return;
-	} 
-	*sub++ = '\0';
+	}
+	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.
@@ -740,28 +934,36 @@ pg_show(const struct req *req, char *path)
 	 * relative to the manpath root.
 	 */
 
-	if (-1 == chdir(path)) {
-		resp_error_badrequest(
-		    "You specified an invalid manpath.");
+	if (chdir(manpath) == -1) {
+		warn("chdir %s", manpath);
+		pg_error_internal();
+		free(manpath);
 		return;
 	}
+	free(manpath);
 
-	if ('c' == *sub)
-		catman(req, sub);
-	else
-		format(req, sub);
+	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, char *path)
+pg_search(const struct req *req)
 {
 	struct mansearch	  search;
 	struct manpaths		  paths;
 	struct manpage		 *res;
-	char			**cp;
-	const char		 *ep, *start;
+	char			**argv;
+	char			 *query, *rp, *wp;
 	size_t			  ressz;
-	int			  i, sz;
+	int			  argc;
 
 	/*
 	 * Begin by chdir()ing into the root of the manpath.
@@ -769,62 +971,67 @@ pg_search(const struct req *req, char *path)
 	 * relative to the manpath root.
 	 */
 
-	if (-1 == (chdir(req->q.manpath))) {
-		resp_error_badrequest(
-		    "You specified an invalid manpath.");
+	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.deftype = TYPE_Nm | TYPE_Nd;
-	search.flags = 0;
+	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(".");
 
 	/*
-	 * Poor man's tokenisation: just break apart by spaces.
-	 * Yes, this is half-ass.  But it works for now.
+	 * Break apart at spaces with backslash-escaping.
 	 */
 
-	ep = req->q.expr;
-	while (ep && isspace((unsigned char)*ep))
-		ep++;
+	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++;
+		}
+	}
 
-	sz = 0;
-	cp = NULL;
-	while (ep && '\0' != *ep) {
-		cp = mandoc_reallocarray(cp, sz + 1, sizeof(char *));
-		start = ep;
-		while ('\0' != *ep && ! isspace((unsigned char)*ep))
-			ep++;
-		cp[sz] = mandoc_malloc((ep - start) + 1);
-		memcpy(cp[sz], start, ep - start);
-		cp[sz++][ep - start] = '\0';
-		while (isspace((unsigned char)*ep))
-			ep++;
-	}
-
-	if (0 == mansearch(&search, &paths, sz, cp, "Nd", &res, &ressz))
-		resp_noresult(req, "You entered an invalid query.");
-	else if (0 == ressz)
-		resp_noresult(req, "No results found.");
+	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
-		resp_search(req, res, ressz);
-
-	for (i = 0; i < sz; i++)
-		free(cp[i]);
-	free(cp);
-
-	for (i = 0; i < (int)ressz; i++) {
-		free(res[i].file);
-		free(res[i].names);
-		free(res[i].output);
-	}
-	free(res);
+		pg_searchres(req, res, ressz);
 
+	free(query);
+	mansearch_free(res, ressz);
 	free(paths.paths[0]);
 	free(paths.paths);
 }
@@ -832,124 +1039,223 @@ pg_search(const struct req *req, char *path)
 int
 main(void)
 {
-	int		 i;
 	struct req	 req;
-	char		*querystring, *path, *subpath;
-
-	/* Scan our run-time environment. */
+	struct itimerval itimer;
+	const char	*path;
+	const char	*querystring;
+	int		 i;
 
-	if (NULL == (mandir = getenv("MAN_DIR")))
-		mandir = "/man";
+#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 (NULL == (scriptname = getenv("SCRIPT_NAME")))
-		scriptname = "";
+	if (pledge("stdio rpath", NULL) == -1) {
+		warn("pledge");
+		pg_error_internal();
+		return EXIT_FAILURE;
+	}
+#endif
 
-	if (NULL == (cssdir = getenv("CSS_DIR")))
-		cssdir = "";
+	/* Poor man's ReDoS mitigation. */
 
-	if (NULL == (httphost = getenv("HTTP_HOST")))
-		httphost = "localhost";
+	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 mandir so that
+	 * First we change directory into the MAN_DIR so that
 	 * subsequent scanning for manpath directories is rooted
 	 * relative to the same position.
 	 */
 
-	if (-1 == chdir(mandir)) {
-		fprintf(stderr, "MAN_DIR: %s: %s\n",
-		    mandir, strerror(errno));
-		resp_error_internal();
-		return(EXIT_FAILURE);
-	} 
+	if (chdir(MAN_DIR) == -1) {
+		warn("MAN_DIR: %s", MAN_DIR);
+		pg_error_internal();
+		return EXIT_FAILURE;
+	}
 
 	memset(&req, 0, sizeof(struct req));
-	pathgen(&req);
-
-	/* Next parse out the query string. */
-
-	if (NULL != (querystring = getenv("QUERY_STRING")))
-		http_parse(&req, querystring);
-
-	/*
-	 * Now juggle paths to extract information.
-	 * We want to extract our filetype (the file suffix), the
-	 * initial path component, then the trailing component(s).
-	 * Start with leading subpath component. 
-	 */
+	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;
+	}
 
-	subpath = path = NULL;
-	req.page = PAGE__MAX;
+	if (req.q.arch != NULL && validate_arch(req.q.arch) == 0) {
+		pg_error_badrequest(
+		    "You specified an invalid architecture.");
+		return EXIT_FAILURE;
+	}
 
-	if (NULL == (path = getenv("PATH_INFO")) || '\0' == *path)
-		req.page = PAGE_INDEX;
+	/* Dispatch to the three different pages. */
 
-	if (NULL != path && '/' == *path && '\0' == *++path)
-		req.page = PAGE_INDEX;
+	if ('\0' != *path)
+		pg_show(&req, path);
+	else if (NULL != req.q.query)
+		pg_search(&req);
+	else
+		pg_index(&req);
 
-	/* Resolve subpath component. */
+	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 (NULL != path && NULL != (subpath = strchr(path, '/')))
-		*subpath++ = '\0';
+/*
+ * Translate PATH_INFO to a query.
+ */
+static void
+parse_path_info(struct req *req, const char *path)
+{
+	const char	*name, *sec, *end;
 
-	/* Map path into one we recognise. */
+	req->isquery = 0;
+	req->q.equal = 1;
+	req->q.manpath = NULL;
+	req->q.arch = NULL;
 
-	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;
-			}
+	/* 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;
+	}
 
-	/* Route pages. */
+	/* Handle the case of name[.section] only. */
+	if (name == path)
+		return;
 
-	switch (req.page) {
-	case (PAGE_INDEX):
-		pg_index(&req, subpath);
-		break;
-	case (PAGE_SEARCH):
-		pg_search(&req, subpath);
-		break;
-	case (PAGE_SHOW):
-		pg_show(&req, subpath);
-		break;
-	default:
-		resp_error_notfound(path);
-		break;
+	/* 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;
 	}
 
-	for (i = 0; i < (int)req.psz; i++)
-		free(req.p[i]);
-	free(req.p);
-	return(EXIT_SUCCESS);
-}
-
-static int
-cmp(const void *p1, const void *p2)
-{
+	/* 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;
+	}
 
-	return(strcasecmp(((const struct manpage *)p1)->names,
-	    ((const struct manpage *)p2)->names));
+	/* 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
-pathgen(struct req *req)
+parse_manpath_conf(struct req *req)
 {
 	FILE	*fp;
 	char	*dp;
 	size_t	 dpsz;
+	ssize_t	 len;
 
-	if (NULL == (fp = fopen("manpath.conf", "r")))
-		return;
+	if ((fp = fopen("manpath.conf", "r")) == NULL) {
+		warn("%s/manpath.conf", MAN_DIR);
+		pg_error_internal();
+		exit(EXIT_FAILURE);
+	}
 
-	while (NULL != (dp = fgetln(fp, &dpsz))) {
-		if ('\n' == dp[dpsz - 1])
-			dpsz--;
+	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 *));
-		req->p[req->psz++] = mandoc_strndup(dp, dpsz);
+		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);
 	}
 }