usr.bin/whereis/whereis.c

   1 /*
   2  * Copyright © 2002, Jörg Wunsch
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  16  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
  17  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  19  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  21  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  22  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  23  * POSSIBILITY OF SUCH DAMAGE.
  24  * $FreeBSD: src/usr.bin/whereis/whereis.c,v 1.12 2002/08/22 01:50:51 johan Exp $
  25  */
  26
  27 /*
  28  * 4.3BSD UI-compatible whereis(1) utility.  Rewritten from scratch
  29  * since the original 4.3BSD version suffers legal problems that
  30  * prevent it from being redistributed, and since the 4.4BSD version
  31  * was pretty inferior in functionality.
  32  */
  33
  34 #include <sys/types.h>
  35
  36
  37 #include <sys/stat.h>
  38 #include <sys/sysctl.h>
  39
  40 #include <dirent.h>
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <locale.h>
  44 #include <regex.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <sysexits.h>
  49 #include <unistd.h>
  50
  51 #include "pathnames.h"
  52
  53 #define NO_BIN_FOUND    1
  54 #define NO_MAN_FOUND    2
  55 #define NO_SRC_FOUND    4
  56
  57 typedef const char *ccharp;
  58
  59 int opt_a, opt_b, opt_m, opt_q, opt_s, opt_u, opt_x;
  60 ccharp *bindirs, *mandirs, *sourcedirs;
  61 char **query;
  62
  63 const char *sourcepath = PATH_SOURCES;
  64
  65 char    *colonify(ccharp *);
  66 int      contains(ccharp *, const char *);
  67 void     decolonify(char *, ccharp **, int *);
  68 void     defaults(void);
  69 void     scanopts(int, char **);
  70 void     usage(void);
  71
  72 /*
  73  * Throughout this program, a number of strings are dynamically
  74  * allocated but never freed.  Their memory is written to when
  75  * splitting the strings into string lists which will later be
  76  * processed.  Since it's important that those string lists remain
  77  * valid even after the functions allocating the memory returned,
  78  * those functions cannot free them.  They could be freed only at end
  79  * of main(), which is pretty pointless anyway.
  80  *
  81  * The overall amount of memory to be allocated for processing the
  82  * strings is not expected to exceed a few kilobytes.  For that
  83  * reason, allocation can usually always be assumed to succeed (within
  84  * a virtual memory environment), thus we simply bail out using
  85  * abort(3) in case of an allocation failure.
  86  */
  87
  88 void
  89 usage(void)
  90 {
  91         errx(EX_USAGE,
  92              "usage: whereis [-abmqsux] [-BMS dir... -f] name ...");
  93 }
  94
  95 /*
  96  * Scan options passed to program.
  97  *
  98  * Note that the -B/-M/-S options expect a list of directory
  99  * names that must be terminated with -f.
 100  */
 101 void
 102 scanopts(int argc, char **argv)
 103 {
 104         int c, i;
 105         ccharp **dirlist;
 106
 107         while ((c = getopt(argc, argv, "BMSabfmqsux")) != -1)
 108                 switch (c) {
 109                 case 'B':
 110                         dirlist = &bindirs;
 111                         goto dolist;
 112
 113                 case 'M':
 114                         dirlist = &mandirs;
 115                         goto dolist;
 116
 117                 case 'S':
 118                         dirlist = &sourcedirs;
 119                   dolist:
 120                         i = 0;
 121                         *dirlist = realloc(*dirlist, (i + 1) * sizeof(char *));
 122                         (*dirlist)[i] = NULL;
 123                         while (optind < argc &&
 124                                strcmp(argv[optind], "-f") != 0 &&
 125                                strcmp(argv[optind], "-B") != 0 &&
 126                                strcmp(argv[optind], "-M") != 0 &&
 127                                strcmp(argv[optind], "-S") != 0) {
 128                                 decolonify(argv[optind], dirlist, &i);
 129                                 optind++;
 130                         }
 131                         break;
 132
 133                 case 'a':
 134                         opt_a = 1;
 135                         break;
 136
 137                 case 'b':
 138                         opt_b = 1;
 139                         break;
 140
 141                 case 'f':
 142                         goto breakout;
 143
 144                 case 'm':
 145                         opt_m = 1;
 146                         break;
 147
 148                 case 'q':
 149                         opt_q = 1;
 150                         break;
 151
 152                 case 's':
 153                         opt_s = 1;
 154                         break;
 155
 156                 case 'u':
 157                         opt_u = 1;
 158                         break;
 159
 160                 case 'x':
 161                         opt_x = 1;
 162                         break;
 163
 164                 default:
 165                         usage();
 166                 }
 167 breakout:
 168         if (optind == argc)
 169                 usage();
 170         query = argv + optind;
 171 }
 172
 173 /*
 174  * Find out whether string `s' is contained in list `cpp'.
 175  */
 176 int
 177 contains(ccharp *cpp, const char *s)
 178 {
 179         ccharp cp;
 180
 181         if (cpp == NULL)
 182                 return (0);
 183
 184         while ((cp = *cpp) != NULL) {
 185                 if (strcmp(cp, s) == 0)
 186                         return (1);
 187                 cpp++;
 188         }
 189         return (0);
 190 }
 191
 192 /*
 193  * Split string `s' at colons, and pass it to the string list pointed
 194  * to by `cppp' (which has `*ip' elements).  Note that the original
 195  * string is modified by replacing the colon with a NUL byte.  The
 196  * partial string is only added if it has a length greater than 0, and
 197  * if it's not already contained in the string list.
 198  */
 199 void
 200 decolonify(char *s, ccharp **cppp, int *ip)
 201 {
 202         char *cp;
 203
 204         while ((cp = strchr(s, ':')), *s != '\0') {
 205                 if (cp)
 206                         *cp = '\0';
 207                 if (strlen(s) && !contains(*cppp, s)) {
 208                         *cppp = realloc(*cppp, (*ip + 2) * sizeof(char *));
 209                         if (cppp == NULL)
 210                                 abort();
 211                         (*cppp)[*ip] = s;
 212                         (*cppp)[*ip + 1] = NULL;
 213                         (*ip)++;
 214                 }
 215                 if (cp)
 216                         s = cp + 1;
 217                 else
 218                         break;
 219         }
 220 }
 221
 222 /*
 223  * Join string list `cpp' into a colon-separated string.
 224  */
 225 char *
 226 colonify(ccharp *cpp)
 227 {
 228         size_t s;
 229         char *cp;
 230         int i;
 231
 232         if (cpp == NULL)
 233                 return (0);
 234
 235         for (s = 0, i = 0; cpp[i] != NULL; i++)
 236                 s += strlen(cpp[i]) + 1;
 237         if ((cp = malloc(s + 1)) == NULL)
 238                 abort();
 239         for (i = 0, *cp = '\0'; cpp[i] != NULL; i++) {
 240                 strcat(cp, cpp[i]);
 241                 strcat(cp, ":");
 242         }
 243         cp[s - 1] = '\0';               /* eliminate last colon */
 244
 245         return (cp);
 246 }
 247
 248 /*
 249  * Provide defaults for all options and directory lists.
 250  */
 251 void
 252 defaults(void)
 253 {
 254         size_t s;
 255         char *b, buf[BUFSIZ], *cp;
 256         int nele;
 257         FILE *p;
 258         DIR *dir;
 259         struct stat sb;
 260         struct dirent *dirp;
 261
 262         /* default to -bms if none has been specified */
 263         if (!opt_b && !opt_m && !opt_s)
 264                 opt_b = opt_m = opt_s = 1;
 265
 266         /* -b defaults to default path + /usr/libexec +
 267          * /usr/games + user's path */
 268         if (!bindirs) {
 269                 if (sysctlbyname("user.cs_path", NULL, &s, NULL, 0) == -1)
 270                         err(EX_OSERR, "sysctlbyname(\"user.cs_path\")");
 271                 if ((b = malloc(s + 1)) == NULL)
 272                         abort();
 273                 if (sysctlbyname("user.cs_path", b, &s, NULL, 0) == -1)
 274                         err(EX_OSERR, "sysctlbyname(\"user.cs_path\")");
 275                 nele = 0;
 276                 decolonify(b, &bindirs, &nele);
 277                 bindirs = realloc(bindirs, (nele + 3) * sizeof(char *));
 278                 if (bindirs == NULL)
 279                         abort();
 280                 bindirs[nele++] = PATH_LIBEXEC;
 281                 bindirs[nele++] = PATH_GAMES;
 282                 bindirs[nele] = NULL;
 283                 if ((cp = getenv("PATH")) != NULL) {
 284                         /* don't destroy the original environment... */
 285                         if ((b = malloc(strlen(cp) + 1)) == NULL)
 286                                 abort();
 287                         strcpy(b, cp);
 288                         decolonify(b, &bindirs, &nele);
 289                 }
 290         }
 291
 292         /* -m defaults to $(manpath) */
 293         if (!mandirs) {
 294                 if ((p = popen(MANPATHCMD, "r")) == NULL)
 295                         err(EX_OSERR, "cannot execute manpath command");
 296                 if (fgets(buf, BUFSIZ - 1, p) == NULL ||
 297                     pclose(p))
 298                         err(EX_OSERR, "error processing manpath results");
 299                 if ((b = strchr(buf, '\n')) != NULL)
 300                         *b = '\0';
 301                 if ((b = malloc(strlen(buf) + 1)) == NULL)
 302                         abort();
 303                 strcpy(b, buf);
 304                 nele = 0;
 305                 decolonify(b, &mandirs, &nele);
 306         }
 307
 308         /* -s defaults to precompiled list, plus subdirs of /usr/dports */
 309         if (!sourcedirs) {
 310                 if ((b = malloc(strlen(sourcepath) + 1)) == NULL)
 311                         abort();
 312                 strcpy(b, sourcepath);
 313                 nele = 0;
 314                 decolonify(b, &sourcedirs, &nele);
 315
 316                 if (stat(PATH_DPORTS, &sb) == -1) {
 317                         if (errno != ENOENT)
 318                                 err(EX_OSERR, "stat(" PATH_DPORTS ")");
 319                 } else {
 320                         if ((sb.st_mode & S_IFMT) != S_IFDIR)
 321                                 /* /usr/dports is not a directory, ignore */
 322                                 return;
 323                         if (access(PATH_DPORTS, R_OK | X_OK) != 0)
 324                                 return;
 325                         if ((dir = opendir(PATH_DPORTS)) == NULL)
 326                                 err(EX_OSERR, "opendir" PATH_DPORTS ")");
 327                         while ((dirp = readdir(dir)) != NULL) {
 328                                 if (dirp->d_name[0] == '.')
 329                                         /* ignore dot entries */
 330                                         continue;
 331                                 b = malloc(sizeof PATH_DPORTS + 1 +
 332                                     dirp->d_namlen);
 333                                 if (b == NULL)
 334                                         abort();
 335                                 strcpy(b, PATH_DPORTS);
 336                                 strcat(b, "/");
 337                                 strcat(b, dirp->d_name);
 338                                 if (stat(b, &sb) == -1 ||
 339                                     (sb.st_mode & S_IFMT) != S_IFDIR ||
 340                                     access(b, R_OK | X_OK) != 0) {
 341                                         free(b);
 342                                         continue;
 343                                 }
 344                                 sourcedirs = realloc(sourcedirs,
 345                                     (nele + 2) * sizeof(char *));
 346                                 if (sourcedirs == NULL)
 347                                         abort();
 348                                 sourcedirs[nele++] = b;
 349                                 sourcedirs[nele] = NULL;
 350                         }
 351                         closedir(dir);
 352                 }
 353         }
 354 }
 355
 356 int
 357 main(int argc, char **argv)
 358 {
 359         int unusual, i, printed;
 360         char *bin, buf[BUFSIZ], *cp, *cp2, *man, *name, *src;
 361         ccharp *dp;
 362         size_t nlen, olen, s;
 363         struct stat sb;
 364         regex_t re, re2;
 365         regmatch_t matches[2];
 366         regoff_t rlen;
 367         FILE *p;
 368
 369         setlocale(LC_ALL, "");
 370         scanopts(argc, argv);
 371         defaults();
 372
 373         if (mandirs == NULL)
 374                 opt_m = 0;
 375         if (bindirs == NULL)
 376                 opt_b = 0;
 377         if (sourcedirs == NULL)
 378                 opt_s = 0;
 379         if (opt_m + opt_b + opt_s == 0)
 380                 errx(EX_DATAERR, "no directories to search");
 381
 382         if (opt_m) {
 383                 if (setenv("MANPATH", colonify(mandirs), 1) == -1)
 384                         err(1, "setenv: cannot set MANPATH=%s", colonify(mandirs));
 385                 if ((i = regcomp(&re, MANWHEREISMATCH, REG_EXTENDED)) != 0) {
 386                         regerror(i, &re, buf, BUFSIZ - 1);
 387                         errx(EX_UNAVAILABLE, "regcomp(%s) failed: %s",
 388                              MANWHEREISMATCH, buf);
 389                 }
 390         }
 391
 392         for (; (name = *query) != NULL; query++) {
 393                 /* strip leading path name component */
 394                 if ((cp = strrchr(name, '/')) != NULL)
 395                         name = cp + 1;
 396                 /* strip SCCS or RCS suffix/prefix */
 397                 if (strlen(name) > 2 && strncmp(name, "s.", 2) == 0)
 398                         name += 2;
 399                 if ((s = strlen(name)) > 2 && strcmp(name + s - 2, ",v") == 0)
 400                         name[s - 2] = '\0';
 401                 /* compression suffix */
 402                 s = strlen(name);
 403                 if (s > 2 &&
 404                     (strcmp(name + s - 2, ".z") == 0 ||
 405                      strcmp(name + s - 2, ".Z") == 0))
 406                         name[s - 2] = '\0';
 407                 else if (s > 3 &&
 408                          strcmp(name + s - 3, ".gz") == 0)
 409                         name[s - 3] = '\0';
 410                 else if (s > 4 &&
 411                          strcmp(name + s - 4, ".bz2") == 0)
 412                         name[s - 4] = '\0';
 413
 414                 unusual = 0;
 415                 bin = man = src = NULL;
 416                 s = strlen(name);
 417
 418                 if (opt_b) {
 419                         /*
 420                          * Binaries have to match exactly, and must be regular
 421                          * executable files.
 422                          */
 423                         unusual = unusual | NO_BIN_FOUND;
 424                         for (dp = bindirs; *dp != NULL; dp++) {
 425                                 cp = malloc(strlen(*dp) + 1 + s + 1);
 426                                 if (cp == NULL)
 427                                         abort();
 428                                 strcpy(cp, *dp);
 429                                 strcat(cp, "/");
 430                                 strcat(cp, name);
 431                                 if (stat(cp, &sb) == 0 &&
 432                                     (sb.st_mode & S_IFMT) == S_IFREG &&
 433                                     (sb.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
 434                                     != 0) {
 435                                         unusual = unusual & ~NO_BIN_FOUND;
 436                                         if (bin == NULL) {
 437                                                 bin = strdup(cp);
 438                                         } else {
 439                                                 olen = strlen(bin);
 440                                                 nlen = strlen(cp);
 441                                                 bin = realloc(bin,
 442                                                               olen + nlen + 2);
 443                                                 if (bin == NULL)
 444                                                         abort();
 445                                                 strcat(bin, " ");
 446                                                 strcat(bin, cp);
 447                                         }
 448                                         if (!opt_a) {
 449                                                 free(cp);
 450                                                 break;
 451                                         }
 452                                 }
 453                                 free(cp);
 454                         }
 455                 }
 456
 457                 if (opt_m) {
 458                         /*
 459                          * Ask the man command to perform the search for us.
 460                          */
 461                         unusual = unusual | NO_MAN_FOUND;
 462                         if (opt_a)
 463                                 cp = malloc(sizeof MANWHEREISALLCMD - 2 + s);
 464                         else
 465                                 cp = malloc(sizeof MANWHEREISCMD - 2 + s);
 466
 467                         if (cp == NULL)
 468                                 abort();
 469
 470                         if (opt_a)
 471                                 sprintf(cp, MANWHEREISALLCMD, name);
 472                         else
 473                                 sprintf(cp, MANWHEREISCMD, name);
 474
 475                         if ((p = popen(cp, "r")) != NULL) {
 476
 477                                 while (fgets(buf, BUFSIZ - 1, p) != NULL) {
 478                                         unusual = unusual & ~NO_MAN_FOUND;
 479
 480                                         if ((cp2 = strchr(buf, '\n')) != NULL)
 481                                                 *cp2 = '\0';
 482                                         if (regexec(&re, buf, 2,
 483                                                     matches, 0) == 0 &&
 484                                             (rlen = matches[1].rm_eo -
 485                                              matches[1].rm_so) > 0) {
 486                                                 /*
 487                                                  * man -w found formated
 488                                                  * page, need to pick up
 489                                                  * source page name.
 490                                                  */
 491                                                 cp2 = malloc(rlen + 1);
 492                                                 if (cp2 == NULL)
 493                                                         abort();
 494                                                 memcpy(cp2,
 495                                                        buf + matches[1].rm_so,
 496                                                        rlen);
 497                                                 cp2[rlen] = '\0';
 498                                         } else {
 499                                                 /*
 500                                                  * man -w found plain source
 501                                                  * page, use it.
 502                                                  */
 503                                                 s = strlen(buf);
 504                                                 cp2 = malloc(s + 1);
 505                                                 if (cp2 == NULL)
 506                                                         abort();
 507                                                 strcpy(cp2, buf);
 508                                         }
 509
 510                                         if (man == NULL) {
 511                                                 man = strdup(cp2);
 512                                         } else {
 513                                                 olen = strlen(man);
 514                                                 nlen = strlen(cp2);
 515                                                 man = realloc(man,
 516                                                               olen + nlen + 2);
 517                                                 if (man == NULL)
 518                                                         abort();
 519                                                 strcat(man, " ");
 520                                                 strcat(man, cp2);
 521                                         }
 522
 523                                         free(cp2);
 524
 525                                         if (!opt_a)
 526                                                 break;
 527                                 }
 528                                 pclose(p);
 529                                 free(cp);
 530                         }
 531                 }
 532
 533                 if (opt_s) {
 534                         /*
 535                          * Sources match if a subdir with the exact
 536                          * name is found.
 537                          */
 538                         unusual = unusual | NO_SRC_FOUND;
 539                         for (dp = sourcedirs; *dp != NULL; dp++) {
 540                                 cp = malloc(strlen(*dp) + 1 + s + 1);
 541                                 if (cp == NULL)
 542                                         abort();
 543                                 strcpy(cp, *dp);
 544                                 strcat(cp, "/");
 545                                 strcat(cp, name);
 546                                 if (stat(cp, &sb) == 0 &&
 547                                     (sb.st_mode & S_IFMT) == S_IFDIR) {
 548                                         unusual = unusual & ~NO_SRC_FOUND;
 549                                         if (src == NULL) {
 550                                                 src = strdup(cp);
 551                                         } else {
 552                                                 olen = strlen(src);
 553                                                 nlen = strlen(cp);
 554                                                 src = realloc(src,
 555                                                               olen + nlen + 2);
 556                                                 if (src == NULL)
 557                                                         abort();
 558                                                 strcat(src, " ");
 559                                                 strcat(src, cp);
 560                                         }
 561                                         if (!opt_a) {
 562                                                 free(cp);
 563                                                 break;
 564                                         }
 565                                 }
 566                                 free(cp);
 567                         }
 568                         /*
 569                          * If still not found, ask locate to search it
 570                          * for us.  This will find sources for things
 571                          * like lpr that are well hidden in the
 572                          * /usr/src tree, but takes a lot longer.
 573                          * Thus, option -x (`expensive') prevents this
 574                          * search.
 575                          *
 576                          * Do only match locate output that starts
 577                          * with one of our source directories, and at
 578                          * least one further level of subdirectories.
 579                          */
 580                         if (opt_x || (src && !opt_a))
 581                                 goto done_sources;
 582
 583                         cp = malloc(sizeof LOCATECMD - 2 + s);
 584                         if (cp == NULL)
 585                                 abort();
 586                         sprintf(cp, LOCATECMD, name);
 587                         if ((p = popen(cp, "r")) == NULL)
 588                                 goto done_sources;
 589                         while ((src == NULL || opt_a) &&
 590                                (fgets(buf, BUFSIZ - 1, p)) != NULL) {
 591                                 if ((cp2 = strchr(buf, '\n')) != NULL)
 592                                         *cp2 = '\0';
 593                                 for (dp = sourcedirs;
 594                                      (src == NULL || opt_a) && *dp != NULL;
 595                                      dp++) {
 596                                         cp2 = malloc(strlen(*dp) + 9);
 597                                         if (cp2 == NULL)
 598                                                 abort();
 599                                         strcpy(cp2, "^");
 600                                         strcat(cp2, *dp);
 601                                         strcat(cp2, "/[^/]+/");
 602                                         if ((i = regcomp(&re2, cp2,
 603                                                          REG_EXTENDED|REG_NOSUB))
 604                                             != 0) {
 605                                                 regerror(i, &re, buf,
 606                                                          BUFSIZ - 1);
 607                                                 errx(EX_UNAVAILABLE,
 608                                                      "regcomp(%s) failed: %s",
 609                                                      cp2, buf);
 610                                         }
 611                                         free(cp2);
 612                                         if (regexec(&re2, buf, 0, NULL, 0)
 613                                             == 0) {
 614                                                 unusual = unusual &
 615                                                           ~NO_SRC_FOUND;
 616                                                 if (src == NULL) {
 617                                                         src = strdup(buf);
 618                                                 } else {
 619                                                         olen = strlen(src);
 620                                                         nlen = strlen(buf);
 621                                                         src = realloc(src,
 622                                                                       olen +
 623                                                                       nlen + 2);
 624                                                         if (src == NULL)
 625                                                                 abort();
 626                                                         strcat(src, " ");
 627                                                         strcat(src, buf);
 628                                                 }
 629                                         }
 630                                         regfree(&re2);
 631                                 }
 632                         }
 633                         pclose(p);
 634                         free(cp);
 635                 }
 636 done_sources:
 637
 638                 if (opt_u && !unusual)
 639                         continue;
 640
 641                 printed = 0;
 642                 if (!opt_q) {
 643                         printf("%s:", name);
 644                         printed++;
 645                 }
 646                 if (bin) {
 647                         if (printed++)
 648                                 putchar(' ');
 649                         fputs(bin, stdout);
 650                 }
 651                 if (man) {
 652                         if (printed++)
 653                                 putchar(' ');
 654                         fputs(man, stdout);
 655                 }
 656                 if (src) {
 657                         if (printed++)
 658                                 putchar(' ');
 659                         fputs(src, stdout);
 660                 }
 661                 if (printed)
 662                         putchar('\n');
 663         }
 664
 665         if (opt_m)
 666                 regfree(&re);
 667
 668         return (0);
 669 }