Fix blunder in previous: we must keep the line parse buffer

[mandoc.git] / cgi.c

diff --git a/cgi.c b/cgi.c
index 67ad47bb939b1e553e9a613d72f3eb04233ff938..af56da2701e90c3f6fa34a50d527f2df1a45d6c8 100644 (file)
--- a/cgi.c
+++ b/cgi.c
@@ -1,311 +1,1199 @@
-/*     $Id: cgi.c,v 1.3 2011/11/13 10:12:05 schwarze Exp $ */
-#include <assert.h>
+/*     $Id: cgi.c,v 1.148 2017/02/22 16:20:01 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 <fcntl.h>

-#include <regex.h>
+#include <limits.h>
+#include <stdint.h>

 #include <stdio.h>
 #include <stdio.h>

-#include <stdarg.h>

 #include <stdlib.h>
 #include <string.h>
 #include <stdlib.h>
 #include <string.h>

+#include <unistd.h>

 
 

-#include "apropos_db.h"
+#include "mandoc_aux.h"

 #include "mandoc.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             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_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_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_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
 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)
        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
 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
  */
 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);
+               }
+
+               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);

                }
 
                }
 

-               (*kv)[(int)*kvsz].key = mandoc_strdup(key);
-               (*kv)[(int)*kvsz].val = mandoc_strdup(val);
-               (*kvsz)++;
+               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
  */
 static int

-kval_decode(char *p)
+http_decode(char *p)

 {
        char             hex[3];
 {
        char             hex[3];

+       char            *q;

        int              c;
 
        hex[2] = '\0';
 
        int              c;
 
        hex[2] = '\0';
 

-       for ( ; '\0' != *p; p++) {
+       q = p;
+       for ( ; '\0' != *p; p++, q++) {

                if ('%' == *p) {
                        if ('\0' == (hex[0] = *(p + 1)))
                if ('%' == *p) {
                        if ('\0' == (hex[0] = *(p + 1)))

-                               return(0);
+                               return 0;

                        if ('\0' == (hex[1] = *(p + 2)))
                        if ('\0' == (hex[1] = *(p + 2)))

-                               return(0);
+                               return 0;

                        if (1 != sscanf(hex, "%x", &c))
                        if (1 != sscanf(hex, "%x", &c))

-                               return(0);
+                               return 0;

                        if ('\0' == c)
                        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
                } else

-                       *p = '+' == *p ? ' ' : *p;
+                       *q = '+' == *p ? ' ' : *p;

        }
 
        }
 

-       *p = '\0';
-       return(1);
+       *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);
+               close(fd);
+       }
+}
+
+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",
+              CSS_DIR, CUSTOMIZE_TITLE);
+
+       resp_copy(MAN_DIR "/header.html");
+}

 
 

-/* ARGSUSED */

 static void
 static void

-pg_index(const struct req *req, char *path)
+resp_end_html(void)

 {
 
 {
 

+       resp_copy(MAN_DIR "/footer.html");
+
+       puts("</body>\n"
+            "</html>");

 }
 
 }
 

-#if 0

 static void
 static void

-pg_searchres(struct rec *recs, size_t sz, void *arg)
+resp_searchform(const struct req *req, enum focus focus)

 {
        int              i;
 {
        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);
+
+       /* Write query input box. */
+
+       printf("    <input type=\"text\" 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");

 
 

-       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 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 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>");
+       }
+
+       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_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, 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);
+       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");
+       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();

 }
 }

-#endif

 
 static void
 
 static void

-pg_search(const struct req *req, char *path)
+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");
+               printf("Location: http://%s/%s%s%s/%s",
+                   HTTP_HOST, scriptname,
+                   *scriptname == '\0' ? "" : "/",
+                   req->q.manpath, r[0].file);
+               printf("\r\n"
+                    "Content-Type: text/html; charset=utf-8\r\n"
+                    "\r\n");
+               return;
+       }
+
+       resp_begin_html(200, 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=\"/%s%s%s/%s\">",
+                           scriptname, *scriptname == '\0' ? "" : "/",
+                           req->q.manpath, 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>");
+       }
+
+       /*
+        * In man(1) mode, show one of the pages
+        * even if more than one is found.
+        */
+
+       if (req->q.equal || sz == 1) {
+               puts("<hr>");
+               iuse = 0;
+               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_show(req, r[iuse].file);
+       }
+
+       resp_end_html();
+}
+
+static void
+resp_catman(const struct req *req, const char *file)
+{
+       FILE            *f;
+       char            *p;
+       size_t           sz;
+       ssize_t          len;

        int              i;
        int              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;
+       }
+
+       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;
+       }

 
 

-       if (i == (int)req->fieldsz)
+       mchars_alloc();
+       mp = mparse_alloc(MPARSE_SO | MPARSE_UTF8 | MPARSE_LATIN1,
+           MANDOCLEVEL_BADARG, NULL, 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%%N.%%S",
+           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;
                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);
+       }

 
 

-       memset(&opt, 0, sizeof(struct opts));
-       /*opt.types = TYPE_NAME | TYPE_DESC;
-       apropos_search(&opt, req->fields[i].val, NULL, pg_searchres);*/
+       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);
+       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++;
+               }
+       }
+
+       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)
 {
 }
 
 int
 main(void)
 {

-       int              i;

        struct req       req;
        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));
 
        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 || 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 ( ! (NULL == req.q.arch || validate_urifrag(req.q.arch))) {
+               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;
+       }
+
+       /* 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);

        }
 
        }
 

-       kval_free(req.fields, req.fieldsz);
-       return(EXIT_SUCCESS);
+       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);
+       }

 }
 }