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Revision 1.114, Thu Nov 5 20:55:41 2015 UTC (8 years, 4 months ago) by schwarze
Branch: MAIN
Changes since 1.113: +20 -2 lines

Use include files "header.html" and "footer.html" rather than a
compiled-in string.  This is not a security risk, we read the file
manpath.conf from the same directory, anyway.  No error handling
is needed; even if the files are absent, that's not an error.

This is more flexible without causing complication of the code or
the user interface.  It helps the upcoming revamp of the online
manual pages on man.NetBSD.org.

Based on an idea by Jean-Yves Migeon <jeanyves dot migeon at free dot fr>,
but implemented in a much simpler way.

/*	$Id: cgi.c,v 1.114 2015/11/05 20:55:41 schwarze Exp $ */
/*
 * Copyright (c) 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2014, 2015 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>
#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 "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 */
};

static	void		 catman(const struct req *, const char *);
static	void		 format(const struct req *, const char *);
static	void		 html_print(const char *);
static	void		 html_putchar(char);
static	int		 http_decode(char *);
static	void		 http_parse(struct req *, const char *);
static	void		 http_print(const char *);
static	void		 http_putchar(char);
static	void		 http_printquery(const struct req *, const char *);
static	void		 pathgen(struct req *);
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_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 *);
static	void		 resp_begin_http(int, const char *);
static	void		 resp_copy(const char *);
static	void		 resp_end_html(void);
static	void		 resp_searchform(const struct req *);
static	void		 resp_show(const struct req *, const char *);
static	void		 set_query_attr(char **, 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; /* CGI 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",       "armish",      "armv7",
    "aviion",      "hppa",        "hppa64",      "i386",
    "ia64",        "landisk",     "loongson",    "luna88k",
    "macppc",      "mips64",      "octeon",      "sgi",
    "socppc",      "solbourne",   "sparc",       "sparc64",
    "vax",         "zaurus",
    "amiga",       "arc",         "arm32",       "atari",
    "beagle",      "cats",        "hp300",       "mac68k",
    "mvme68k",     "mvme88k",     "mvmeppc",     "palm",
    "pc532",       "pegasos",     "pmax",        "powerpc",
    "sun3",        "wgrisc",      "x68k"
};
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("&quote;");
		break;
	case ('&'):
		printf("&amp;");
		break;
	case ('>'):
		printf("&gt;");
		break;
	case ('<'):
		printf("&lt;");
		break;
	default:
		putchar((unsigned char)c);
		break;
	}
}

static void
http_printquery(const struct req *req, const char *sep)
{

	if (NULL != req->q.query) {
		printf("query=");
		http_print(req->q.query);
	}
	if (0 == req->q.equal)
		printf("%sapropos=1", sep);
	if (NULL != req->q.sec) {
		printf("%ssec=", sep);
		http_print(req->q.sec);
	}
	if (NULL != req->q.arch) {
		printf("%sarch=", sep);
		http_print(req->q.arch);
	}
	if (strcmp(req->q.manpath, req->p[0])) {
		printf("%smanpath=", sep);
		http_print(req->q.manpath);
	}
}

static void
http_print(const char *p)
{

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

/*
 * 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
http_parse(struct req *req, const char *qs)
{
	char		*key, *val;
	size_t		 keysz, valsz;

	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++;
	}
}

static void
http_putchar(char c)
{

	if (isalnum((unsigned char)c)) {
		putchar((unsigned char)c);
		return;
	} else if (' ' == c) {
		putchar('+');
		return;
	}
	printf("%%%.2x", c);
}

/*
 * 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
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);
}

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);
	}
}

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

	resp_begin_http(code, msg);

	printf("<!DOCTYPE html>\n"
	       "<HTML>\n"
	       "<HEAD>\n"
	       "<META CHARSET=\"UTF-8\" />\n"
	       "<LINK REL=\"stylesheet\" HREF=\"%s/mandoc.css\""
	       " TYPE=\"text/css\" media=\"all\">\n"
	       "<TITLE>%s</TITLE>\n"
	       "</HEAD>\n"
	       "<BODY>\n"
	       "<!-- Begin page content. //-->\n",
	       CSS_DIR, 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)
{
	int		 i;

	puts("<!-- Begin search form. //-->");
	printf("<DIV ID=\"mancgi\">\n"
	       "<FORM ACTION=\"%s\" METHOD=\"get\">\n"
	       "<FIELDSET>\n"
	       "<LEGEND>Manual Page Search Parameters</LEGEND>\n",
	       scriptname);

	/* Write query input box. */

	printf(	"<TABLE><TR><TD>\n"
		"<INPUT TYPE=\"text\" NAME=\"query\" VALUE=\"");
	if (NULL != req->q.query)
		html_print(req->q.query);
	puts("\" SIZE=\"40\">");

	/* Write submission and reset buttons. */

	printf(	"<INPUT TYPE=\"submit\" VALUE=\"Submit\">\n"
		"<INPUT TYPE=\"reset\" VALUE=\"Reset\">\n");

	/* Write show radio button */

	printf(	"</TD><TD>\n"
		"<INPUT TYPE=\"radio\" ");
	if (req->q.equal)
		printf("CHECKED=\"checked\" ");
	printf(	"NAME=\"apropos\" ID=\"show\" VALUE=\"0\">\n"
		"<LABEL FOR=\"show\">Show named manual page</LABEL>\n");

	/* Write section selector. */

	puts(	"</TD></TR><TR><TD>\n"
		"<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 VALUE=\"%s\"", arch_names[i]);
		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("VALUE=\"");
			html_print(req->p[i]);
			printf("\">");
			html_print(req->p[i]);
			puts("</OPTION>");
		}
		puts("</SELECT>");
	}

	/* Write search radio button */

	printf(	"</TD><TD>\n"
		"<INPUT TYPE=\"radio\" ");
	if (0 == req->q.equal)
		printf("CHECKED=\"checked\" ");
	printf(	"NAME=\"apropos\" ID=\"search\" VALUE=\"1\">\n"
		"<LABEL FOR=\"search\">Search with apropos query</LABEL>\n");

	puts("</TD></TR></TABLE>\n"
	     "</FIELDSET>\n"
	     "</FORM>\n"
	     "</DIV>");
	puts("<!-- End search 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;

	if ( ! strcmp(manpath, "mandoc"))
		return 1;

	for (i = 0; i < req->psz; i++)
		if ( ! strcmp(manpath, req->p[i]))
			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);
	resp_searchform(req);
	printf("<P>\n"
	       "This web interface is documented in the\n"
	       "<A HREF=\"%s/mandoc/man8/man.cgi.8\">man.cgi</A>\n"
	       "manual, and the\n"
	       "<A HREF=\"%s/mandoc/man1/apropos.1\">apropos</A>\n"
	       "manual explains the query syntax.\n"
	       "</P>\n",
	       scriptname, scriptname);
	resp_end_html();
}

static void
pg_noresult(const struct req *req, const char *msg)
{
	resp_begin_html(200, NULL);
	resp_searchform(req);
	puts("<P>");
	puts(msg);
	puts("</P>");
	resp_end_html();
}

static void
pg_error_badrequest(const char *msg)
{

	resp_begin_html(400, "Bad Request");
	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");
	puts("<P>Internal Server Error</P>");
	resp_end_html();
}

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

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

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

	resp_begin_html(200, NULL);
	resp_searchform(req);
	puts("<DIV CLASS=\"results\">");
	puts("<TABLE>");

	for (i = 0; i < sz; i++) {
		printf("<TR>\n"
		       "<TD CLASS=\"title\">\n"
		       "<A HREF=\"%s/%s/%s?",
		    scriptname, req->q.manpath, r[i].file);
		http_printquery(req, "&amp;");
		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>");

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

	if (req->q.equal) {
		puts("<HR>");
		iuse = 0;
		priouse = 10;
		archpriouse = 3;
		for (i = 0; i < sz; i++) {
			isec = strcspn(r[i].file, "123456789");
			sec = r[i].file[isec];
			if ('\0' == sec)
				continue;
			prio = sec_prios[sec - '1'];
			if (NULL == req->q.arch) {
				archprio =
				    (NULL == (arch = strchr(
					r[i].file + isec, '/'))) ? 3 :
				    (NULL == (archend = strchr(
					arch + 1, '/'))) ? 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_show(req, r[iuse].file);
	}

	resp_end_html();
}

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

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

	puts("<DIV CLASS=\"catman\">\n"
	     "<PRE>");

	while (NULL != (p = fgetln(f, &len))) {
		bold = italic = 0;
		for (i = 0; i < (int)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 >= (int)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 == (int)len - 1 && '\n' != p[i])
			html_putchar(p[i]);

		putchar('\n');
	}

	puts("</PRE>\n"
	     "</DIV>");

	fclose(f);
}

static void
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;
	}

	mchars_alloc();
	mp = mparse_alloc(MPARSE_SO, MANDOCLEVEL_BADARG, NULL, req->q.manpath);
	mparse_readfd(mp, fd, file);
	close(fd);

	memset(&conf, 0, sizeof(conf));
	conf.fragment = 1;
	usepath = strcmp(req->q.manpath, req->p[0]);
	mandoc_asprintf(&conf.man, "%s?query=%%N&sec=%%S%s%s%s%s",
	    scriptname,
	    req->q.arch	? "&arch="       : "",
	    req->q.arch	? req->q.arch    : "",
	    usepath	? "&manpath="    : "",
	    usepath	? req->q.manpath : "");

	mparse_result(mp, &man, NULL);
	if (man == NULL) {
		fprintf(stderr, "fatal mandoc error: %s/%s\n",
		    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);
}

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

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

	if ('c' == *file)
		catman(req, file);
	else
		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) {
		fprintf(stderr, "chdir %s: %s\n",
		    manpath, strerror(errno));
		pg_error_internal();
		free(manpath);
		return;
	}

	if (strcmp(manpath, "mandoc")) {
		free(req->q.manpath);
		req->q.manpath = manpath;
	} else
		free(manpath);

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

	resp_begin_html(200, NULL);
	resp_searchform(req);
	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 (-1 == (chdir(req->q.manpath))) {
		fprintf(stderr, "chdir %s: %s\n",
		    req->q.manpath, strerror(errno));
		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++;
		}
	}

	if (0 == mansearch(&search, &paths, argc, argv, &res, &ressz))
		pg_noresult(req, "You entered an invalid query.");
	else if (0 == ressz)
		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)
{
	struct req	 req;
	struct itimerval itimer;
	const char	*path;
	const char	*querystring;
	int		 i;

	/* 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) {
		fprintf(stderr, "setitimer: %s\n", strerror(errno));
		pg_error_internal();
		return EXIT_FAILURE;
	}

	/* Scan our run-time environment. */

	if (NULL == (scriptname = getenv("SCRIPT_NAME")))
		scriptname = "";

	if ( ! validate_urifrag(scriptname)) {
		fprintf(stderr, "unsafe SCRIPT_NAME \"%s\"\n",
		    scriptname);
		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 (-1 == chdir(MAN_DIR)) {
		fprintf(stderr, "MAN_DIR: %s: %s\n",
		    MAN_DIR, strerror(errno));
		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);

	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 == req.q.arch || validate_urifrag(req.q.arch))) {
		pg_error_badrequest(
		    "You specified an invalid architecture.");
		return EXIT_FAILURE;
	}

	/* Dispatch to the three different pages. */

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

	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;
}

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

	if (NULL == (fp = fopen("manpath.conf", "r"))) {
		fprintf(stderr, "%s/manpath.conf: %s\n",
			MAN_DIR, strerror(errno));
		pg_error_internal();
		exit(EXIT_FAILURE);
	}

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

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