cgi.c

   1 /*      $Id: cgi.c,v 1.56 2014/07/09 11:34:46 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2014 Ingo Schwarze <schwarze@usta.de>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #ifdef HAVE_CONFIG_H
  19 #include "config.h"
  20 #endif
  21
  22 #include <ctype.h>
  23 #include <fcntl.h>
  24 #include <limits.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29
  30 #if defined(__sun)
  31 /* for stat() */
  32 #include <fcntl.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #endif
  36
  37 #include "mandoc.h"
  38 #include "mandoc_aux.h"
  39 #include "main.h"
  40 #include "manpath.h"
  41 #include "mansearch.h"
  42
  43 enum    page {
  44         PAGE_INDEX,
  45         PAGE_SEARCH,
  46         PAGE_SHOW,
  47         PAGE__MAX
  48 };
  49
  50 /*
  51  * A query as passed to the search function.
  52  */
  53 struct  query {
  54         const char      *manroot; /* manual root directory */
  55         const char      *arch; /* architecture */
  56         const char      *sec; /* manual section */
  57         const char      *expr; /* unparsed expression string */
  58         int              legacy; /* whether legacy mode */
  59 };
  60
  61 struct  req {
  62         struct query     q;
  63         char            **p; /* array of available manroots */
  64         size_t           psz;
  65         enum page        page;
  66 };
  67
  68 static  void             catman(const struct req *, const char *);
  69 static  int              cmp(const void *, const void *);
  70 static  void             format(const struct req *, const char *);
  71 static  void             html_print(const char *);
  72 static  void             html_printquery(const struct req *);
  73 static  void             html_putchar(char);
  74 static  int              http_decode(char *);
  75 static  void             http_parse(struct req *, char *);
  76 static  void             http_print(const char *);
  77 static  void             http_putchar(char);
  78 static  void             http_printquery(const struct req *);
  79 static  void             pathgen(struct req *);
  80 static  void             pg_index(const struct req *, char *);
  81 static  void             pg_search(const struct req *, char *);
  82 static  void             pg_show(const struct req *, char *);
  83 static  void             resp_bad(void);
  84 static  void             resp_baddb(void);
  85 static  void             resp_error400(void);
  86 static  void             resp_error404(const char *);
  87 static  void             resp_begin_html(int, const char *);
  88 static  void             resp_begin_http(int, const char *);
  89 static  void             resp_end_html(void);
  90 static  void             resp_index(const struct req *);
  91 static  void             resp_search(const struct req *,
  92                                 struct manpage *, size_t);
  93 static  void             resp_searchform(const struct req *);
  94
  95 static  const char       *progname; /* cgi script name */
  96 static  const char       *cache; /* cache directory */
  97 static  const char       *css; /* css directory */
  98 static  const char       *host; /* hostname */
  99
 100 static  const char * const pages[PAGE__MAX] = {
 101         "index", /* PAGE_INDEX */
 102         "search", /* PAGE_SEARCH */
 103         "show", /* PAGE_SHOW */
 104 };
 105
 106 /*
 107  * Print a character, escaping HTML along the way.
 108  * This will pass non-ASCII straight to output: be warned!
 109  */
 110 static void
 111 html_putchar(char c)
 112 {
 113
 114         switch (c) {
 115         case ('"'):
 116                 printf("&quote;");
 117                 break;
 118         case ('&'):
 119                 printf("&amp;");
 120                 break;
 121         case ('>'):
 122                 printf("&gt;");
 123                 break;
 124         case ('<'):
 125                 printf("&lt;");
 126                 break;
 127         default:
 128                 putchar((unsigned char)c);
 129                 break;
 130         }
 131 }
 132 static void
 133 http_printquery(const struct req *req)
 134 {
 135
 136         if (NULL != req->q.manroot) {
 137                 printf("&manpath=");
 138                 http_print(req->q.manroot);
 139         }
 140         if (NULL != req->q.sec) {
 141                 printf("&sec=");
 142                 http_print(req->q.sec);
 143         }
 144         if (NULL != req->q.arch) {
 145                 printf("&arch=");
 146                 http_print(req->q.arch);
 147         }
 148         if (NULL != req->q.expr) {
 149                 printf("&expr=");
 150                 http_print(req->q.expr ? req->q.expr : "");
 151         }
 152 }
 153
 154
 155 static void
 156 html_printquery(const struct req *req)
 157 {
 158
 159         if (NULL != req->q.manroot) {
 160                 printf("&amp;manpath=");
 161                 html_print(req->q.manroot);
 162         }
 163         if (NULL != req->q.sec) {
 164                 printf("&amp;sec=");
 165                 html_print(req->q.sec);
 166         }
 167         if (NULL != req->q.arch) {
 168                 printf("&amp;arch=");
 169                 html_print(req->q.arch);
 170         }
 171         if (NULL != req->q.expr) {
 172                 printf("&amp;expr=");
 173                 html_print(req->q.expr ? req->q.expr : "");
 174         }
 175 }
 176
 177 static void
 178 http_print(const char *p)
 179 {
 180
 181         if (NULL == p)
 182                 return;
 183         while ('\0' != *p)
 184                 http_putchar(*p++);
 185 }
 186
 187 /*
 188  * Call through to html_putchar().
 189  * Accepts NULL strings.
 190  */
 191 static void
 192 html_print(const char *p)
 193 {
 194
 195         if (NULL == p)
 196                 return;
 197         while ('\0' != *p)
 198                 html_putchar(*p++);
 199 }
 200
 201 /*
 202  * Parse out key-value pairs from an HTTP request variable.
 203  * This can be either a cookie or a POST/GET string, although man.cgi
 204  * uses only GET for simplicity.
 205  */
 206 static void
 207 http_parse(struct req *req, char *p)
 208 {
 209         char            *key, *val;
 210         int              legacy;
 211
 212         memset(&req->q, 0, sizeof(struct query));
 213         req->q.manroot = req->p[0];
 214
 215         legacy = -1;
 216         while ('\0' != *p) {
 217                 key = p;
 218                 val = NULL;
 219
 220                 p += (int)strcspn(p, ";&");
 221                 if ('\0' != *p)
 222                         *p++ = '\0';
 223                 if (NULL != (val = strchr(key, '=')))
 224                         *val++ = '\0';
 225
 226                 if ('\0' == *key || NULL == val || '\0' == *val)
 227                         continue;
 228
 229                 /* Just abort handling. */
 230
 231                 if ( ! http_decode(key))
 232                         break;
 233                 if (NULL != val && ! http_decode(val))
 234                         break;
 235
 236                 if (0 == strcmp(key, "expr"))
 237                         req->q.expr = val;
 238                 else if (0 == strcmp(key, "query"))
 239                         req->q.expr = val;
 240                 else if (0 == strcmp(key, "sec"))
 241                         req->q.sec = val;
 242                 else if (0 == strcmp(key, "sektion"))
 243                         req->q.sec = val;
 244                 else if (0 == strcmp(key, "arch"))
 245                         req->q.arch = val;
 246                 else if (0 == strcmp(key, "manpath"))
 247                         req->q.manroot = val;
 248                 else if (0 == strcmp(key, "apropos"))
 249                         legacy = 0 == strcmp(val, "0");
 250         }
 251
 252         /* Test for old man.cgi compatibility mode. */
 253
 254         req->q.legacy = legacy > 0;
 255
 256         /*
 257          * Section "0" means no section when in legacy mode.
 258          * For some man.cgi scripts, "default" arch is none.
 259          */
 260
 261         if (req->q.legacy && NULL != req->q.sec)
 262                 if (0 == strcmp(req->q.sec, "0"))
 263                         req->q.sec = NULL;
 264         if (req->q.legacy && NULL != req->q.arch)
 265                 if (0 == strcmp(req->q.arch, "default"))
 266                         req->q.arch = NULL;
 267 }
 268
 269 static void
 270 http_putchar(char c)
 271 {
 272
 273         if (isalnum((unsigned char)c)) {
 274                 putchar((unsigned char)c);
 275                 return;
 276         } else if (' ' == c) {
 277                 putchar('+');
 278                 return;
 279         }
 280         printf("%%%.2x", c);
 281 }
 282
 283 /*
 284  * HTTP-decode a string.  The standard explanation is that this turns
 285  * "%4e+foo" into "n foo" in the regular way.  This is done in-place
 286  * over the allocated string.
 287  */
 288 static int
 289 http_decode(char *p)
 290 {
 291         char             hex[3];
 292         int              c;
 293
 294         hex[2] = '\0';
 295
 296         for ( ; '\0' != *p; p++) {
 297                 if ('%' == *p) {
 298                         if ('\0' == (hex[0] = *(p + 1)))
 299                                 return(0);
 300                         if ('\0' == (hex[1] = *(p + 2)))
 301                                 return(0);
 302                         if (1 != sscanf(hex, "%x", &c))
 303                                 return(0);
 304                         if ('\0' == c)
 305                                 return(0);
 306
 307                         *p = (char)c;
 308                         memmove(p + 1, p + 3, strlen(p + 3) + 1);
 309                 } else
 310                         *p = '+' == *p ? ' ' : *p;
 311         }
 312
 313         *p = '\0';
 314         return(1);
 315 }
 316
 317 static void
 318 resp_begin_http(int code, const char *msg)
 319 {
 320
 321         if (200 != code)
 322                 printf("Status: %d %s\n", code, msg);
 323
 324         puts("Content-Type: text/html; charset=utf-8\n"
 325              "Cache-Control: no-cache\n"
 326              "Pragma: no-cache\n"
 327              "");
 328
 329         fflush(stdout);
 330 }
 331
 332 static void
 333 resp_begin_html(int code, const char *msg)
 334 {
 335
 336         resp_begin_http(code, msg);
 337
 338         printf("<!DOCTYPE HTML PUBLIC "
 339                " \"-//W3C//DTD HTML 4.01//EN\""
 340                " \"http://www.w3.org/TR/html4/strict.dtd\">\n"
 341                "<HTML>\n"
 342                "<HEAD>\n"
 343                "<META HTTP-EQUIV=\"Content-Type\""
 344                " CONTENT=\"text/html; charset=utf-8\">\n"
 345                "<LINK REL=\"stylesheet\" HREF=\"%s/man-cgi.css\""
 346                " TYPE=\"text/css\" media=\"all\">\n"
 347                "<LINK REL=\"stylesheet\" HREF=\"%s/man.css\""
 348                " TYPE=\"text/css\" media=\"all\">\n"
 349                "<TITLE>System Manpage Reference</TITLE>\n"
 350                "</HEAD>\n"
 351                "<BODY>\n"
 352                "<!-- Begin page content. //-->\n", css, css);
 353 }
 354
 355 static void
 356 resp_end_html(void)
 357 {
 358
 359         puts("</BODY>\n"
 360              "</HTML>");
 361 }
 362
 363 static void
 364 resp_searchform(const struct req *req)
 365 {
 366         int              i;
 367
 368         puts("<!-- Begin search form. //-->");
 369         printf("<DIV ID=\"mancgi\">\n"
 370                "<FORM ACTION=\"%s/search\" METHOD=\"get\">\n"
 371                "<FIELDSET>\n"
 372                "<LEGEND>Search Parameters</LEGEND>\n"
 373                "<INPUT TYPE=\"submit\" "
 374                " VALUE=\"Search\"> for manuals satisfying \n"
 375                "<INPUT TYPE=\"text\" NAME=\"expr\" VALUE=\"",
 376                progname);
 377         html_print(req->q.expr ? req->q.expr : "");
 378         printf("\">, section "
 379                "<INPUT TYPE=\"text\""
 380                " SIZE=\"4\" NAME=\"sec\" VALUE=\"");
 381         html_print(req->q.sec ? req->q.sec : "");
 382         printf("\">, arch "
 383                "<INPUT TYPE=\"text\""
 384                " SIZE=\"8\" NAME=\"arch\" VALUE=\"");
 385         html_print(req->q.arch ? req->q.arch : "");
 386         printf("\">");
 387         if (req->psz > 1) {
 388                 puts(", <SELECT NAME=\"manpath\">");
 389                 for (i = 0; i < (int)req->psz; i++) {
 390                         printf("<OPTION ");
 391                         if (NULL == req->q.manroot ? 0 == i :
 392                             0 == strcmp(req->q.manroot, req->p[i]))
 393                                 printf("SELECTED=\"selected\" ");
 394                         printf("VALUE=\"");
 395                         html_print(req->p[i]);
 396                         printf("\">");
 397                         html_print(req->p[i]);
 398                         puts("</OPTION>");
 399                 }
 400                 puts("</SELECT>");
 401         }
 402         puts(".\n"
 403              "<INPUT TYPE=\"reset\" VALUE=\"Reset\">\n"
 404              "</FIELDSET>\n"
 405              "</FORM>\n"
 406              "</DIV>");
 407         puts("<!-- End search form. //-->");
 408 }
 409
 410 static void
 411 resp_index(const struct req *req)
 412 {
 413
 414         resp_begin_html(200, NULL);
 415         resp_searchform(req);
 416         resp_end_html();
 417 }
 418
 419 static void
 420 resp_error400(void)
 421 {
 422
 423         resp_begin_html(400, "Query Malformed");
 424         printf("<H1>Malformed Query</H1>\n"
 425                "<P>\n"
 426                "The query your entered was malformed.\n"
 427                "Try again from the\n"
 428                "<A HREF=\"%s/index.html\">main page</A>.\n"
 429                "</P>", progname);
 430         resp_end_html();
 431 }
 432
 433 static void
 434 resp_error404(const char *page)
 435 {
 436
 437         resp_begin_html(404, "Not Found");
 438         puts("<H1>Page Not Found</H1>\n"
 439              "<P>\n"
 440              "The page you're looking for, ");
 441         printf("<B>");
 442         html_print(page);
 443         printf("</B>,\n"
 444                "could not be found.\n"
 445                "Try searching from the\n"
 446                "<A HREF=\"%s/index.html\">main page</A>.\n"
 447                "</P>", progname);
 448         resp_end_html();
 449 }
 450
 451 static void
 452 resp_bad(void)
 453 {
 454         resp_begin_html(500, "Internal Server Error");
 455         puts("<P>Generic badness happened.</P>");
 456         resp_end_html();
 457 }
 458
 459 static void
 460 resp_baddb(void)
 461 {
 462
 463         resp_begin_html(500, "Internal Server Error");
 464         puts("<P>Your database is broken.</P>");
 465         resp_end_html();
 466 }
 467
 468 static void
 469 resp_search(const struct req *req, struct manpage *r, size_t sz)
 470 {
 471         size_t           i;
 472
 473         if (1 == sz) {
 474                 /*
 475                  * If we have just one result, then jump there now
 476                  * without any delay.
 477                  */
 478                 puts("Status: 303 See Other");
 479                 printf("Location: http://%s%s/show/%s/%s?",
 480                     host, progname, req->q.manroot, r[0].file);
 481                 http_printquery(req);
 482                 puts("\n"
 483                      "Content-Type: text/html; charset=utf-8\n");
 484                 return;
 485         }
 486
 487         resp_begin_html(200, NULL);
 488         resp_searchform(req);
 489
 490         puts("<DIV CLASS=\"results\">");
 491
 492         if (0 == sz) {
 493                 puts("<P>\n"
 494                      "No results found.\n"
 495                      "</P>\n"
 496                      "</DIV>");
 497                 resp_end_html();
 498                 return;
 499         }
 500
 501         qsort(r, sz, sizeof(struct manpage), cmp);
 502
 503         puts("<TABLE>");
 504
 505         for (i = 0; i < sz; i++) {
 506                 printf("<TR>\n"
 507                        "<TD CLASS=\"title\">\n"
 508                        "<A HREF=\"%s/show/%s/%s?",
 509                     progname, req->q.manroot, r[i].file);
 510                 html_printquery(req);
 511                 printf("\">");
 512                 html_print(r[i].names);
 513                 printf("</A>\n"
 514                        "</TD>\n"
 515                        "<TD CLASS=\"desc\">");
 516                 html_print(r[i].output);
 517                 puts("</TD>\n"
 518                      "</TR>");
 519         }
 520
 521         puts("</TABLE>\n"
 522              "</DIV>");
 523         resp_end_html();
 524 }
 525
 526 /* ARGSUSED */
 527 static void
 528 pg_index(const struct req *req, char *path)
 529 {
 530
 531         resp_index(req);
 532 }
 533
 534 static void
 535 catman(const struct req *req, const char *file)
 536 {
 537         FILE            *f;
 538         size_t           len;
 539         int              i;
 540         char            *p;
 541         int              italic, bold;
 542
 543         if (NULL == (f = fopen(file, "r"))) {
 544                 resp_baddb();
 545                 return;
 546         }
 547
 548         resp_begin_html(200, NULL);
 549         resp_searchform(req);
 550         puts("<DIV CLASS=\"catman\">\n"
 551              "<PRE>");
 552
 553         while (NULL != (p = fgetln(f, &len))) {
 554                 bold = italic = 0;
 555                 for (i = 0; i < (int)len - 1; i++) {
 556                         /*
 557                          * This means that the catpage is out of state.
 558                          * Ignore it and keep going (although the
 559                          * catpage is bogus).
 560                          */
 561
 562                         if ('\b' == p[i] || '\n' == p[i])
 563                                 continue;
 564
 565                         /*
 566                          * Print a regular character.
 567                          * Close out any bold/italic scopes.
 568                          * If we're in back-space mode, make sure we'll
 569                          * have something to enter when we backspace.
 570                          */
 571
 572                         if ('\b' != p[i + 1]) {
 573                                 if (italic)
 574                                         printf("</I>");
 575                                 if (bold)
 576                                         printf("</B>");
 577                                 italic = bold = 0;
 578                                 html_putchar(p[i]);
 579                                 continue;
 580                         } else if (i + 2 >= (int)len)
 581                                 continue;
 582
 583                         /* Italic mode. */
 584
 585                         if ('_' == p[i]) {
 586                                 if (bold)
 587                                         printf("</B>");
 588                                 if ( ! italic)
 589                                         printf("<I>");
 590                                 bold = 0;
 591                                 italic = 1;
 592                                 i += 2;
 593                                 html_putchar(p[i]);
 594                                 continue;
 595                         }
 596
 597                         /*
 598                          * Handle funny behaviour troff-isms.
 599                          * These grok'd from the original man2html.c.
 600                          */
 601
 602                         if (('+' == p[i] && 'o' == p[i + 2]) ||
 603                                         ('o' == p[i] && '+' == p[i + 2]) ||
 604                                         ('|' == p[i] && '=' == p[i + 2]) ||
 605                                         ('=' == p[i] && '|' == p[i + 2]) ||
 606                                         ('*' == p[i] && '=' == p[i + 2]) ||
 607                                         ('=' == p[i] && '*' == p[i + 2]) ||
 608                                         ('*' == p[i] && '|' == p[i + 2]) ||
 609                                         ('|' == p[i] && '*' == p[i + 2]))  {
 610                                 if (italic)
 611                                         printf("</I>");
 612                                 if (bold)
 613                                         printf("</B>");
 614                                 italic = bold = 0;
 615                                 putchar('*');
 616                                 i += 2;
 617                                 continue;
 618                         } else if (('|' == p[i] && '-' == p[i + 2]) ||
 619                                         ('-' == p[i] && '|' == p[i + 1]) ||
 620                                         ('+' == p[i] && '-' == p[i + 1]) ||
 621                                         ('-' == p[i] && '+' == p[i + 1]) ||
 622                                         ('+' == p[i] && '|' == p[i + 1]) ||
 623                                         ('|' == p[i] && '+' == p[i + 1]))  {
 624                                 if (italic)
 625                                         printf("</I>");
 626                                 if (bold)
 627                                         printf("</B>");
 628                                 italic = bold = 0;
 629                                 putchar('+');
 630                                 i += 2;
 631                                 continue;
 632                         }
 633
 634                         /* Bold mode. */
 635
 636                         if (italic)
 637                                 printf("</I>");
 638                         if ( ! bold)
 639                                 printf("<B>");
 640                         bold = 1;
 641                         italic = 0;
 642                         i += 2;
 643                         html_putchar(p[i]);
 644                 }
 645
 646                 /*
 647                  * Clean up the last character.
 648                  * We can get to a newline; don't print that.
 649                  */
 650
 651                 if (italic)
 652                         printf("</I>");
 653                 if (bold)
 654                         printf("</B>");
 655
 656                 if (i == (int)len - 1 && '\n' != p[i])
 657                         html_putchar(p[i]);
 658
 659                 putchar('\n');
 660         }
 661
 662         puts("</PRE>\n"
 663              "</DIV>\n"
 664              "</BODY>\n"
 665              "</HTML>");
 666
 667         fclose(f);
 668 }
 669
 670 static void
 671 format(const struct req *req, const char *file)
 672 {
 673         struct mparse   *mp;
 674         int              fd;
 675         struct mdoc     *mdoc;
 676         struct man      *man;
 677         void            *vp;
 678         enum mandoclevel rc;
 679         char             opts[PATH_MAX + 128];
 680
 681         if (-1 == (fd = open(file, O_RDONLY, 0))) {
 682                 resp_baddb();
 683                 return;
 684         }
 685
 686         mp = mparse_alloc(MPARSE_SO, MANDOCLEVEL_FATAL, NULL,
 687             req->q.manroot);
 688         rc = mparse_readfd(mp, fd, file);
 689         close(fd);
 690
 691         if (rc >= MANDOCLEVEL_FATAL) {
 692                 resp_baddb();
 693                 return;
 694         }
 695
 696         snprintf(opts, sizeof(opts),
 697             "fragment,man=%s/search?sec=%%S&expr=Nm~^%%N$",
 698             progname);
 699
 700         mparse_result(mp, &mdoc, &man, NULL);
 701         if (NULL == man && NULL == mdoc) {
 702                 resp_baddb();
 703                 mparse_free(mp);
 704                 return;
 705         }
 706
 707         resp_begin_html(200, NULL);
 708         resp_searchform(req);
 709
 710         vp = html_alloc(opts);
 711
 712         if (NULL != mdoc)
 713                 html_mdoc(vp, mdoc);
 714         else
 715                 html_man(vp, man);
 716
 717         puts("</BODY>\n"
 718              "</HTML>");
 719
 720         html_free(vp);
 721         mparse_free(mp);
 722 }
 723
 724 static void
 725 pg_show(const struct req *req, char *path)
 726 {
 727         char            *sub;
 728
 729         if (NULL == path || NULL == (sub = strchr(path, '/'))) {
 730                 resp_error400();
 731                 return;
 732         }
 733         *sub++ = '\0';
 734
 735         /*
 736          * Begin by chdir()ing into the manroot.
 737          * This way we can pick up the database files, which are
 738          * relative to the manpath root.
 739          */
 740
 741         if (-1 == chdir(path)) {
 742                 perror(path);
 743                 resp_baddb();
 744                 return;
 745         }
 746
 747         if ('c' == *sub)
 748                 catman(req, sub);
 749         else
 750                 format(req, sub);
 751 }
 752
 753 static void
 754 pg_search(const struct req *req, char *path)
 755 {
 756         struct mansearch          search;
 757         struct manpaths           paths;
 758         struct manpage           *res;
 759         char                    **cp;
 760         const char               *ep, *start;
 761         size_t                    ressz;
 762         int                       i, sz;
 763
 764         /*
 765          * Begin by chdir()ing into the root of the manpath.
 766          * This way we can pick up the database files, which are
 767          * relative to the manpath root.
 768          */
 769
 770         if (-1 == (chdir(req->q.manroot))) {
 771                 perror(req->q.manroot);
 772                 resp_search(req, NULL, 0);
 773                 return;
 774         }
 775
 776         search.arch = req->q.arch;
 777         search.sec = req->q.sec;
 778         search.deftype = TYPE_Nm | TYPE_Nd;
 779         search.flags = 0;
 780
 781         paths.sz = 1;
 782         paths.paths = mandoc_malloc(sizeof(char *));
 783         paths.paths[0] = mandoc_strdup(".");
 784
 785         /*
 786          * Poor man's tokenisation: just break apart by spaces.
 787          * Yes, this is half-ass.  But it works for now.
 788          */
 789
 790         ep = req->q.expr;
 791         while (ep && isspace((unsigned char)*ep))
 792                 ep++;
 793
 794         sz = 0;
 795         cp = NULL;
 796         while (ep && '\0' != *ep) {
 797                 cp = mandoc_reallocarray(cp, sz + 1, sizeof(char *));
 798                 start = ep;
 799                 while ('\0' != *ep && ! isspace((unsigned char)*ep))
 800                         ep++;
 801                 cp[sz] = mandoc_malloc((ep - start) + 1);
 802                 memcpy(cp[sz], start, ep - start);
 803                 cp[sz++][ep - start] = '\0';
 804                 while (isspace((unsigned char)*ep))
 805                         ep++;
 806         }
 807
 808         if (mansearch(&search, &paths, sz, cp, "Nd", &res, &ressz))
 809                 resp_search(req, res, ressz);
 810         else
 811                 resp_baddb();
 812
 813         for (i = 0; i < sz; i++)
 814                 free(cp[i]);
 815         free(cp);
 816
 817         for (i = 0; i < (int)ressz; i++) {
 818                 free(res[i].file);
 819                 free(res[i].names);
 820                 free(res[i].output);
 821         }
 822         free(res);
 823
 824         free(paths.paths[0]);
 825         free(paths.paths);
 826 }
 827
 828 int
 829 main(void)
 830 {
 831         int              i;
 832         struct req       req;
 833         char            *p, *path, *subpath;
 834
 835         /* Scan our run-time environment. */
 836
 837         if (NULL == (cache = getenv("CACHE_DIR")))
 838                 cache = "/cache/man.cgi";
 839
 840         if (NULL == (progname = getenv("SCRIPT_NAME")))
 841                 progname = "";
 842
 843         if (NULL == (css = getenv("CSS_DIR")))
 844                 css = "";
 845
 846         if (NULL == (host = getenv("HTTP_HOST")))
 847                 host = "localhost";
 848
 849         /*
 850          * First we change directory into the cache directory so that
 851          * subsequent scanning for manpath directories is rooted
 852          * relative to the same position.
 853          */
 854
 855         if (-1 == chdir(cache)) {
 856                 perror(cache);
 857                 resp_bad();
 858                 return(EXIT_FAILURE);
 859         }
 860
 861         memset(&req, 0, sizeof(struct req));
 862         pathgen(&req);
 863
 864         /* Next parse out the query string. */
 865
 866         if (NULL != (p = getenv("QUERY_STRING")))
 867                 http_parse(&req, p);
 868
 869         /*
 870          * Now juggle paths to extract information.
 871          * We want to extract our filetype (the file suffix), the
 872          * initial path component, then the trailing component(s).
 873          * Start with leading subpath component.
 874          */
 875
 876         subpath = path = NULL;
 877         req.page = PAGE__MAX;
 878
 879         if (NULL == (path = getenv("PATH_INFO")) || '\0' == *path)
 880                 req.page = PAGE_INDEX;
 881
 882         if (NULL != path && '/' == *path && '\0' == *++path)
 883                 req.page = PAGE_INDEX;
 884
 885         /* Resolve subpath component. */
 886
 887         if (NULL != path && NULL != (subpath = strchr(path, '/')))
 888                 *subpath++ = '\0';
 889
 890         /* Map path into one we recognise. */
 891
 892         if (NULL != path && '\0' != *path)
 893                 for (i = 0; i < (int)PAGE__MAX; i++)
 894                         if (0 == strcmp(pages[i], path)) {
 895                                 req.page = (enum page)i;
 896                                 break;
 897                         }
 898
 899         /* Route pages. */
 900
 901         switch (req.page) {
 902         case (PAGE_INDEX):
 903                 pg_index(&req, subpath);
 904                 break;
 905         case (PAGE_SEARCH):
 906                 pg_search(&req, subpath);
 907                 break;
 908         case (PAGE_SHOW):
 909                 pg_show(&req, subpath);
 910                 break;
 911         default:
 912                 resp_error404(path);
 913                 break;
 914         }
 915
 916         for (i = 0; i < (int)req.psz; i++)
 917                 free(req.p[i]);
 918         free(req.p);
 919         return(EXIT_SUCCESS);
 920 }
 921
 922 static int
 923 cmp(const void *p1, const void *p2)
 924 {
 925
 926         return(strcasecmp(((const struct manpage *)p1)->names,
 927             ((const struct manpage *)p2)->names));
 928 }
 929
 930 /*
 931  * Scan for indexable paths.
 932  */
 933 static void
 934 pathgen(struct req *req)
 935 {
 936         FILE    *fp;
 937         char    *dp;
 938         size_t   dpsz;
 939
 940         if (NULL == (fp = fopen("manpath.conf", "r")))
 941                 return;
 942
 943         while (NULL != (dp = fgetln(fp, &dpsz))) {
 944                 if ('\n' == dp[dpsz - 1])
 945                         dpsz--;
 946                 req->p = mandoc_realloc(req->p,
 947                     (req->psz + 1) * sizeof(char *));
 948                 req->p[req->psz++] = mandoc_strndup(dp, dpsz);
 949         }
 950 }