catman.c

   1 /*      $Id: catman.c,v 1.10 2012/01/03 15:17:20 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17 #ifdef HAVE_CONFIG_H
  18 #include "config.h"
  19 #endif
  20
  21 #include <sys/param.h>
  22 #include <sys/stat.h>
  23 #include <sys/wait.h>
  24
  25 #include <assert.h>
  26 #include <errno.h>
  27 #include <fcntl.h>
  28 #include <getopt.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33
  34 #ifdef __linux__
  35 # include <db_185.h>
  36 #else
  37 # include <db.h>
  38 #endif
  39
  40 #include "manpath.h"
  41 #include "mandocdb.h"
  42
  43 #define xstrlcpy(_dst, _src, _sz) \
  44         do if (strlcpy((_dst), (_src), (_sz)) >= (_sz)) { \
  45                 fprintf(stderr, "%s: Path too long", (_dst)); \
  46                 exit(EXIT_FAILURE); \
  47         } while (/* CONSTCOND */0)
  48
  49 #define xstrlcat(_dst, _src, _sz) \
  50         do if (strlcat((_dst), (_src), (_sz)) >= (_sz)) { \
  51                 fprintf(stderr, "%s: Path too long", (_dst)); \
  52                 exit(EXIT_FAILURE); \
  53         } while (/* CONSTCOND */0)
  54
  55 static  int              indexhtml(char *, size_t, char *, size_t);
  56 static  int              manup(const struct manpaths *, char *);
  57 static  int              mkpath(char *, mode_t, mode_t);
  58 static  int              treecpy(char *, char *);
  59 static  int              update(char *, char *);
  60 static  void             usage(void);
  61
  62 static  const char      *progname;
  63 static  int              verbose;
  64 static  int              force;
  65
  66 int
  67 main(int argc, char *argv[])
  68 {
  69         int              ch;
  70         char            *aux, *base, *conf_file;
  71         struct manpaths  dirs;
  72         char             buf[MAXPATHLEN];
  73         extern char     *optarg;
  74         extern int       optind;
  75
  76         progname = strrchr(argv[0], '/');
  77         if (progname == NULL)
  78                 progname = argv[0];
  79         else
  80                 ++progname;
  81
  82         aux = base = conf_file = NULL;
  83         xstrlcpy(buf, "/var/www/cache/man.cgi", MAXPATHLEN);
  84
  85         while (-1 != (ch = getopt(argc, argv, "C:fm:M:o:v")))
  86                 switch (ch) {
  87                 case ('C'):
  88                         conf_file = optarg;
  89                         break;
  90                 case ('f'):
  91                         force = 1;
  92                         break;
  93                 case ('m'):
  94                         aux = optarg;
  95                         break;
  96                 case ('M'):
  97                         base = optarg;
  98                         break;
  99                 case ('o'):
 100                         xstrlcpy(buf, optarg, MAXPATHLEN);
 101                         break;
 102                 case ('v'):
 103                         verbose++;
 104                         break;
 105                 default:
 106                         usage();
 107                         return(EXIT_FAILURE);
 108                 }
 109
 110         argc -= optind;
 111         argv += optind;
 112
 113         if (argc > 0) {
 114                 usage();
 115                 return(EXIT_FAILURE);
 116         }
 117
 118         memset(&dirs, 0, sizeof(struct manpaths));
 119         manpath_parse(&dirs, conf_file, base, aux);
 120         ch = manup(&dirs, buf);
 121         manpath_free(&dirs);
 122         return(ch ? EXIT_SUCCESS : EXIT_FAILURE);
 123 }
 124
 125 static void
 126 usage(void)
 127 {
 128
 129         fprintf(stderr, "usage: %s "
 130                         "[-fv] "
 131                         "[-C file] "
 132                         "[-o path] "
 133                         "[-m manpath] "
 134                         "[-M manpath]\n",
 135                         progname);
 136 }
 137
 138 /*
 139  * If "src" file doesn't exist (errors out), return -1.  Otherwise,
 140  * return 1 if "src" is newer (which also happens "dst" doesn't exist)
 141  * and 0 otherwise.
 142  */
 143 static int
 144 isnewer(const char *dst, const char *src)
 145 {
 146         struct stat      s1, s2;
 147
 148         if (-1 == stat(src, &s1))
 149                 return(-1);
 150         if (force)
 151                 return(1);
 152
 153         return(-1 == stat(dst, &s2) ? 1 : s1.st_mtime > s2.st_mtime);
 154 }
 155
 156 /*
 157  * Copy the contents of one file into another.
 158  * Returns 0 on failure, 1 on success.
 159  */
 160 static int
 161 filecpy(const char *dst, const char *src)
 162 {
 163         char             buf[BUFSIZ];
 164         int              sfd, dfd, rc;
 165         ssize_t          rsz, wsz;
 166
 167         sfd = dfd = -1;
 168         rc = 0;
 169
 170         if (-1 == (dfd = open(dst, O_CREAT|O_TRUNC|O_WRONLY, 0644))) {
 171                 perror(dst);
 172                 goto out;
 173         } else if (-1 == (sfd = open(src, O_RDONLY, 0))) {
 174                 perror(src);
 175                 goto out;
 176         }
 177
 178         while ((rsz = read(sfd, buf, BUFSIZ)) > 0)
 179                 if (-1 == (wsz = write(dfd, buf, (size_t)rsz))) {
 180                         perror(dst);
 181                         goto out;
 182                 } else if (wsz < rsz) {
 183                         fprintf(stderr, "%s: Short write\n", dst);
 184                         goto out;
 185                 }
 186
 187         if (rsz < 0)
 188                 perror(src);
 189         else
 190                 rc = 1;
 191 out:
 192         if (-1 != sfd)
 193                 close(sfd);
 194         if (-1 != dfd)
 195                 close(dfd);
 196
 197         return(rc);
 198 }
 199
 200 /*
 201  * Pass over the recno database and re-create HTML pages if they're
 202  * found to be out of date.
 203  * Returns -1 on fatal error, 1 on success.
 204  */
 205 static int
 206 indexhtml(char *src, size_t ssz, char *dst, size_t dsz)
 207 {
 208         DB              *idx;
 209         DBT              key, val;
 210         int              c, rc;
 211         unsigned int     fl;
 212         const char      *f;
 213         char            *d;
 214         char             fname[MAXPATHLEN];
 215         pid_t            pid;
 216
 217         pid = -1;
 218
 219         xstrlcpy(fname, dst, MAXPATHLEN);
 220         xstrlcat(fname, "/", MAXPATHLEN);
 221         xstrlcat(fname, MANDOC_IDX, MAXPATHLEN);
 222
 223         idx = dbopen(fname, O_RDONLY, 0, DB_RECNO, NULL);
 224         if (NULL == idx) {
 225                 perror(fname);
 226                 return(-1);
 227         }
 228
 229         fl = R_FIRST;
 230         while (0 == (c = (*idx->seq)(idx, &key, &val, fl))) {
 231                 fl = R_NEXT;
 232                 /*
 233                  * If the record is zero-length, then it's unassigned.
 234                  * Skip past these.
 235                  */
 236                 if (0 == val.size)
 237                         continue;
 238
 239                 f = (const char *)val.data + 1;
 240                 if (NULL == memchr(f, '\0', val.size - 1))
 241                         break;
 242
 243                 src[(int)ssz] = dst[(int)dsz] = '\0';
 244
 245                 xstrlcat(dst, "/", MAXPATHLEN);
 246                 xstrlcat(dst, f, MAXPATHLEN);
 247
 248                 xstrlcat(src, "/", MAXPATHLEN);
 249                 xstrlcat(src, f, MAXPATHLEN);
 250
 251                 if (-1 == (rc = isnewer(dst, src))) {
 252                         fprintf(stderr, "%s: File missing\n", f);
 253                         break;
 254                 } else if (0 == rc)
 255                         continue;
 256
 257                 d = strrchr(dst, '/');
 258                 assert(NULL != d);
 259                 *d = '\0';
 260
 261                 if (-1 == mkpath(dst, 0755, 0755)) {
 262                         perror(dst);
 263                         break;
 264                 }
 265
 266                 *d = '/';
 267
 268                 if ( ! filecpy(dst, src))
 269                         break;
 270                 if (verbose)
 271                         printf("%s\n", dst);
 272         }
 273
 274         (*idx->close)(idx);
 275
 276         if (c < 0)
 277                 perror(fname);
 278         else if (0 == c)
 279                 fprintf(stderr, "%s: Corrupt index\n", fname);
 280
 281         return(1 == c ? 1 : -1);
 282 }
 283
 284 /*
 285  * Copy both recno and btree databases into the destination.
 286  * Call in to begin recreating HTML files.
 287  * Return -1 on fatal error and 1 if the update went well.
 288  */
 289 static int
 290 update(char *dst, char *src)
 291 {
 292         size_t           dsz, ssz;
 293
 294         dsz = strlen(dst);
 295         ssz = strlen(src);
 296
 297         xstrlcat(src, "/", MAXPATHLEN);
 298         xstrlcat(dst, "/", MAXPATHLEN);
 299
 300         xstrlcat(src, MANDOC_DB, MAXPATHLEN);
 301         xstrlcat(dst, MANDOC_DB, MAXPATHLEN);
 302
 303         if ( ! filecpy(dst, src))
 304                 return(-1);
 305         if (verbose)
 306                 printf("%s\n", dst);
 307
 308         dst[(int)dsz] = src[(int)ssz] = '\0';
 309
 310         xstrlcat(src, "/", MAXPATHLEN);
 311         xstrlcat(dst, "/", MAXPATHLEN);
 312
 313         xstrlcat(src, MANDOC_IDX, MAXPATHLEN);
 314         xstrlcat(dst, MANDOC_IDX, MAXPATHLEN);
 315
 316         if ( ! filecpy(dst, src))
 317                 return(-1);
 318         if (verbose)
 319                 printf("%s\n", dst);
 320
 321         dst[(int)dsz] = src[(int)ssz] = '\0';
 322
 323         return(indexhtml(src, ssz, dst, dsz));
 324 }
 325
 326 /*
 327  * See if btree or recno databases in the destination are out of date
 328  * with respect to a single manpath component.
 329  * Return -1 on fatal error, 0 if the source is no longer valid (and
 330  * shouldn't be listed), and 1 if the update went well.
 331  */
 332 static int
 333 treecpy(char *dst, char *src)
 334 {
 335         size_t           dsz, ssz;
 336         int              rc;
 337
 338         dsz = strlen(dst);
 339         ssz = strlen(src);
 340
 341         xstrlcat(src, "/", MAXPATHLEN);
 342         xstrlcat(dst, "/", MAXPATHLEN);
 343
 344         xstrlcat(src, MANDOC_IDX, MAXPATHLEN);
 345         xstrlcat(dst, MANDOC_IDX, MAXPATHLEN);
 346
 347         if (-1 == (rc = isnewer(dst, src)))
 348                 return(0);
 349
 350         dst[(int)dsz] = src[(int)ssz] = '\0';
 351
 352         if (1 == rc)
 353                 return(update(dst, src));
 354
 355         xstrlcat(src, "/", MAXPATHLEN);
 356         xstrlcat(dst, "/", MAXPATHLEN);
 357
 358         xstrlcat(src, MANDOC_DB, MAXPATHLEN);
 359         xstrlcat(dst, MANDOC_DB, MAXPATHLEN);
 360
 361         if (-1 == (rc = isnewer(dst, src)))
 362                 return(0);
 363         else if (rc == 0)
 364                 return(1);
 365
 366         dst[(int)dsz] = src[(int)ssz] = '\0';
 367
 368         return(update(dst, src));
 369 }
 370
 371 /*
 372  * Update the destination's file-tree with respect to changes in the
 373  * source manpath components.
 374  * "Change" is defined by an updated index or btree database.
 375  * Returns 1 on success, 0 on failure.
 376  */
 377 static int
 378 manup(const struct manpaths *dirs, char *base)
 379 {
 380         char             dst[MAXPATHLEN],
 381                          src[MAXPATHLEN];
 382         const char      *path;
 383         int              i, c;
 384         size_t           sz;
 385         FILE            *f;
 386
 387         /* Create the path and file for the catman.conf file. */
 388
 389         sz = strlen(base);
 390         xstrlcpy(dst, base, MAXPATHLEN);
 391         xstrlcat(dst, "/etc", MAXPATHLEN);
 392         if (-1 == mkpath(dst, 0755, 0755)) {
 393                 perror(dst);
 394                 return(0);
 395         }
 396
 397         xstrlcat(dst, "/catman.conf", MAXPATHLEN);
 398         if (NULL == (f = fopen(dst, "w"))) {
 399                 perror(dst);
 400                 return(0);
 401         } else if (verbose)
 402                 printf("%s\n", dst);
 403
 404         for (i = 0; i < dirs->sz; i++) {
 405                 path = dirs->paths[i];
 406                 dst[(int)sz] = '\0';
 407                 xstrlcat(dst, path, MAXPATHLEN);
 408                 if (-1 == mkpath(dst, 0755, 0755)) {
 409                         perror(dst);
 410                         break;
 411                 }
 412
 413                 xstrlcpy(src, path, MAXPATHLEN);
 414                 if (-1 == (c = treecpy(dst, src)))
 415                         break;
 416                 else if (0 == c)
 417                         continue;
 418
 419                 /*
 420                  * We want to use a relative path here because manpath.h
 421                  * will realpath() when invoked with man.cgi, and we'll
 422                  * make sure to chdir() into the cache directory before.
 423                  *
 424                  * This allows the cache directory to be in an arbitrary
 425                  * place, working in both chroot() and non-chroot()
 426                  * "safe" modes.
 427                  */
 428                 assert('/' == path[0]);
 429                 fprintf(f, "_whatdb %s/whatis.db\n", path + 1);
 430         }
 431
 432         fclose(f);
 433         return(i == dirs->sz);
 434 }
 435
 436 /*
 437  * Copyright (c) 1983, 1992, 1993
 438  *      The Regents of the University of California.  All rights reserved.
 439  *
 440  * Redistribution and use in source and binary forms, with or without
 441  * modification, are permitted provided that the following conditions
 442  * are met:
 443  * 1. Redistributions of source code must retain the above copyright
 444  *    notice, this list of conditions and the following disclaimer.
 445  * 2. Redistributions in binary form must reproduce the above copyright
 446  *    notice, this list of conditions and the following disclaimer in the
 447  *    documentation and/or other materials provided with the distribution.
 448  * 3. Neither the name of the University nor the names of its contributors
 449  *    may be used to endorse or promote products derived from this software
 450  *    without specific prior written permission.
 451  *
 452  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 453  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 454  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 455  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 456  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 457  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 458  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 459  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 460  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 461  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 462  * SUCH DAMAGE.
 463  */
 464 static int
 465 mkpath(char *path, mode_t mode, mode_t dir_mode)
 466 {
 467         struct stat sb;
 468         char *slash;
 469         int done, exists;
 470
 471         slash = path;
 472
 473         for (;;) {
 474                 /* LINTED */
 475                 slash += strspn(slash, "/");
 476                 /* LINTED */
 477                 slash += strcspn(slash, "/");
 478
 479                 done = (*slash == '\0');
 480                 *slash = '\0';
 481
 482                 /* skip existing path components */
 483                 exists = !stat(path, &sb);
 484                 if (!done && exists && S_ISDIR(sb.st_mode)) {
 485                         *slash = '/';
 486                         continue;
 487                 }
 488
 489                 if (mkdir(path, done ? mode : dir_mode) == 0) {
 490                         if (mode > 0777 && chmod(path, mode) < 0)
 491                                 return (-1);
 492                 } else {
 493                         if (!exists) {
 494                                 /* Not there */
 495                                 return (-1);
 496                         }
 497                         if (!S_ISDIR(sb.st_mode)) {
 498                                 /* Is there, but isn't a directory */
 499                                 errno = ENOTDIR;
 500                                 return (-1);
 501                         }
 502                 }
 503
 504                 if (done)
 505                         break;
 506
 507                 *slash = '/';
 508         }
 509
 510         return (0);
 511 }