xref: /dragonfly/usr.bin/whereis/whereis.c (revision 9a92bb4c) 
1 /*
2  * Copyright � 2002, J�rg 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  * $DragonFly: src/usr.bin/whereis/whereis.c,v 1.6 2008/06/05 18:06:33 swildner Exp $
26  */
27 
28 /*
29  * 4.3BSD UI-compatible whereis(1) utility.  Rewritten from scratch
30  * since the original 4.3BSD version suffers legal problems that
31  * prevent it from being redistributed, and since the 4.4BSD version
32  * was pretty inferior in functionality.
33  */
34 
35 #include <sys/types.h>
36 
37 
38 #include <sys/stat.h>
39 #include <sys/sysctl.h>
40 
41 #include <dirent.h>
42 #include <err.h>
43 #include <errno.h>
44 #include <locale.h>
45 #include <regex.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <sysexits.h>
50 #include <unistd.h>
51 
52 #include "pathnames.h"
53 
54 #define	NO_BIN_FOUND	1
55 #define	NO_MAN_FOUND	2
56 #define	NO_SRC_FOUND	4
57 
58 typedef const char *ccharp;
59 
60 int opt_a, opt_b, opt_m, opt_q, opt_s, opt_u, opt_x;
61 ccharp *bindirs, *mandirs, *sourcedirs;
62 char **query;
63 
64 const char *sourcepath = PATH_SOURCES;
65 
66 char	*colonify(ccharp *);
67 int	 contains(ccharp *, const char *);
68 void	 decolonify(char *, ccharp **, int *);
69 void	 defaults(void);
70 void	 scanopts(int, char **);
71 void	 usage(void);
72 
73 /*
74  * Throughout this program, a number of strings are dynamically
75  * allocated but never freed.  Their memory is written to when
76  * splitting the strings into string lists which will later be
77  * processed.  Since it's important that those string lists remain
78  * valid even after the functions allocating the memory returned,
79  * those functions cannot free them.  They could be freed only at end
80  * of main(), which is pretty pointless anyway.
81  *
82  * The overall amount of memory to be allocated for processing the
83  * strings is not expected to exceed a few kilobytes.  For that
84  * reason, allocation can usually always be assumed to succeed (within
85  * a virtual memory environment), thus we simply bail out using
86  * abort(3) in case of an allocation failure.
87  */
88 
89 void
90 usage(void)
91 {
92 	errx(EX_USAGE,
93 	     "usage: whereis [-abmqsux] [-BMS dir... -f] name ...");
94 }
95 
96 /*
97  * Scan options passed to program.
98  *
99  * Note that the -B/-M/-S options expect a list of directory
100  * names that must be terminated with -f.
101  */
102 void
103 scanopts(int argc, char **argv)
104 {
105 	int c, i;
106 	ccharp **dirlist;
107 
108 	while ((c = getopt(argc, argv, "BMSabfmqsux")) != -1)
109 		switch (c) {
110 		case 'B':
111 			dirlist = &bindirs;
112 			goto dolist;
113 
114 		case 'M':
115 			dirlist = &mandirs;
116 			goto dolist;
117 
118 		case 'S':
119 			dirlist = &sourcedirs;
120 		  dolist:
121 			i = 0;
122 			*dirlist = realloc(*dirlist, (i + 1) * sizeof(char *));
123 			(*dirlist)[i] = NULL;
124 			while (optind < argc &&
125 			       strcmp(argv[optind], "-f") != 0 &&
126 			       strcmp(argv[optind], "-B") != 0 &&
127 			       strcmp(argv[optind], "-M") != 0 &&
128 			       strcmp(argv[optind], "-S") != 0) {
129 				decolonify(argv[optind], dirlist, &i);
130 				optind++;
131 			}
132 			break;
133 
134 		case 'a':
135 			opt_a = 1;
136 			break;
137 
138 		case 'b':
139 			opt_b = 1;
140 			break;
141 
142 		case 'f':
143 			goto breakout;
144 
145 		case 'm':
146 			opt_m = 1;
147 			break;
148 
149 		case 'q':
150 			opt_q = 1;
151 			break;
152 
153 		case 's':
154 			opt_s = 1;
155 			break;
156 
157 		case 'u':
158 			opt_u = 1;
159 			break;
160 
161 		case 'x':
162 			opt_x = 1;
163 			break;
164 
165 		default:
166 			usage();
167 		}
168   breakout:
169 	if (optind == argc)
170 		usage();
171 	query = argv + optind;
172 }
173 
174 /*
175  * Find out whether string `s' is contained in list `cpp'.
176  */
177 int
178 contains(ccharp *cpp, const char *s)
179 {
180 	ccharp cp;
181 
182 	if (cpp == NULL)
183 		return (0);
184 
185 	while ((cp = *cpp) != NULL) {
186 		if (strcmp(cp, s) == 0)
187 			return (1);
188 		cpp++;
189 	}
190 	return (0);
191 }
192 
193 /*
194  * Split string `s' at colons, and pass it to the string list pointed
195  * to by `cppp' (which has `*ip' elements).  Note that the original
196  * string is modified by replacing the colon with a NUL byte.  The
197  * partial string is only added if it has a length greater than 0, and
198  * if it's not already contained in the string list.
199  */
200 void
201 decolonify(char *s, ccharp **cppp, int *ip)
202 {
203 	char *cp;
204 
205 	while ((cp = strchr(s, ':')), *s != '\0') {
206 		if (cp)
207 			*cp = '\0';
208 		if (strlen(s) && !contains(*cppp, s)) {
209 			*cppp = realloc(*cppp, (*ip + 2) * sizeof(char *));
210 			if (cppp == NULL)
211 				abort();
212 			(*cppp)[*ip] = s;
213 			(*cppp)[*ip + 1] = NULL;
214 			(*ip)++;
215 		}
216 		if (cp)
217 			s = cp + 1;
218 		else
219 			break;
220 	}
221 }
222 
223 /*
224  * Join string list `cpp' into a colon-separated string.
225  */
226 char *
227 colonify(ccharp *cpp)
228 {
229 	size_t s;
230 	char *cp;
231 	int i;
232 
233 	if (cpp == NULL)
234 		return (0);
235 
236 	for (s = 0, i = 0; cpp[i] != NULL; i++)
237 		s += strlen(cpp[i]) + 1;
238 	if ((cp = malloc(s + 1)) == NULL)
239 		abort();
240 	for (i = 0, *cp = '\0'; cpp[i] != NULL; i++) {
241 		strcat(cp, cpp[i]);
242 		strcat(cp, ":");
243 	}
244 	cp[s - 1] = '\0';		/* eliminate last colon */
245 
246 	return (cp);
247 }
248 
249 /*
250  * Provide defaults for all options and directory lists.
251  */
252 void
253 defaults(void)
254 {
255 	size_t s;
256 	char *b, buf[BUFSIZ], *cp;
257 	int nele;
258 	FILE *p;
259 	DIR *dir;
260 	struct stat sb;
261 	struct dirent *dirp;
262 
263 	/* default to -bms if none has been specified */
264 	if (!opt_b && !opt_m && !opt_s)
265 		opt_b = opt_m = opt_s = 1;
266 
267 	/* -b defaults to default path + /usr/libexec +
268 	 * /usr/games + user's path */
269 	if (!bindirs) {
270 		if (sysctlbyname("user.cs_path", NULL, &s, NULL, 0) == -1)
271 			err(EX_OSERR, "sysctlbyname(\"user.cs_path\")");
272 		if ((b = malloc(s + 1)) == NULL)
273 			abort();
274 		if (sysctlbyname("user.cs_path", b, &s, NULL, 0) == -1)
275 			err(EX_OSERR, "sysctlbyname(\"user.cs_path\")");
276 		nele = 0;
277 		decolonify(b, &bindirs, &nele);
278 		bindirs = realloc(bindirs, (nele + 3) * sizeof(char *));
279 		if (bindirs == NULL)
280 			abort();
281 		bindirs[nele++] = PATH_LIBEXEC;
282 		bindirs[nele++] = PATH_GAMES;
283 		bindirs[nele] = NULL;
284 		if ((cp = getenv("PATH")) != NULL) {
285 			/* don't destroy the original environment... */
286 			if ((b = malloc(strlen(cp) + 1)) == NULL)
287 				abort();
288 			strcpy(b, cp);
289 			decolonify(b, &bindirs, &nele);
290 		}
291 	}
292 
293 	/* -m defaults to $(manpath) */
294 	if (!mandirs) {
295 		if ((p = popen(MANPATHCMD, "r")) == NULL)
296 			err(EX_OSERR, "cannot execute manpath command");
297 		if (fgets(buf, BUFSIZ - 1, p) == NULL ||
298 		    pclose(p))
299 			err(EX_OSERR, "error processing manpath results");
300 		if ((b = strchr(buf, '\n')) != NULL)
301 			*b = '\0';
302 		if ((b = malloc(strlen(buf) + 1)) == NULL)
303 			abort();
304 		strcpy(b, buf);
305 		nele = 0;
306 		decolonify(b, &mandirs, &nele);
307 	}
308 
309 	/* -s defaults to precompiled list, plus subdirs of /usr/pkgsrc */
310 	if (!sourcedirs) {
311 		if ((b = malloc(strlen(sourcepath) + 1)) == NULL)
312 			abort();
313 		strcpy(b, sourcepath);
314 		nele = 0;
315 		decolonify(b, &sourcedirs, &nele);
316 
317 		if (stat(PATH_PKGSRC, &sb) == -1) {
318 			if (errno == ENOENT)
319 				/* no /usr/pkgsrc, we are done */
320 				return;
321 			err(EX_OSERR, "stat(" PATH_PKGSRC ")");
322 		}
323 		if ((sb.st_mode & S_IFMT) != S_IFDIR)
324 			/* /usr/pkgsrc is not a directory, ignore */
325 			return;
326 		if (access(PATH_PKGSRC, R_OK | X_OK) != 0)
327 			return;
328 		if ((dir = opendir(PATH_PKGSRC)) == NULL)
329 			err(EX_OSERR, "opendir" PATH_PKGSRC ")");
330 		while ((dirp = readdir(dir)) != NULL) {
331 			if (dirp->d_name[0] == '.' ||
332 			    strcmp(dirp->d_name, "CVS") == 0)
333 				/* ignore dot entries and CVS subdir */
334 				continue;
335 			if ((b = malloc(sizeof PATH_PKGSRC + 1 + dirp->d_namlen))
336 			    == NULL)
337 				abort();
338 			strcpy(b, PATH_PKGSRC);
339 			strcat(b, "/");
340 			strcat(b, dirp->d_name);
341 			if (stat(b, &sb) == -1 ||
342 			    (sb.st_mode & S_IFMT) != S_IFDIR ||
343 			    access(b, R_OK | X_OK) != 0) {
344 				free(b);
345 				continue;
346 			}
347 			sourcedirs = realloc(sourcedirs,
348 					     (nele + 2) * sizeof(char *));
349 			if (sourcedirs == NULL)
350 				abort();
351 			sourcedirs[nele++] = b;
352 			sourcedirs[nele] = NULL;
353 		}
354 		closedir(dir);
355 	}
356 }
357 
358 int
359 main(int argc, char **argv)
360 {
361 	int unusual, i, printed;
362 	char *bin, buf[BUFSIZ], *cp, *cp2, *man, *name, *src;
363 	ccharp *dp;
364 	size_t nlen, olen, s;
365 	struct stat sb;
366 	regex_t re, re2;
367 	regmatch_t matches[2];
368 	regoff_t rlen;
369 	FILE *p;
370 
371 	setlocale(LC_ALL, "");
372 	scanopts(argc, argv);
373 	defaults();
374 
375 	if (mandirs == NULL)
376 		opt_m = 0;
377 	if (bindirs == NULL)
378 		opt_b = 0;
379 	if (sourcedirs == NULL)
380 		opt_s = 0;
381 	if (opt_m + opt_b + opt_s == 0)
382 		errx(EX_DATAERR, "no directories to search");
383 
384 	if (opt_m) {
385 		if (setenv("MANPATH", colonify(mandirs), 1) == -1)
386 			err(1, "setenv: cannot set MANPATH=%s", colonify(mandirs));
387 		if ((i = regcomp(&re, MANWHEREISMATCH, REG_EXTENDED)) != 0) {
388 			regerror(i, &re, buf, BUFSIZ - 1);
389 			errx(EX_UNAVAILABLE, "regcomp(%s) failed: %s",
390 			     MANWHEREISMATCH, buf);
391 		}
392 	}
393 
394 	for (; (name = *query) != NULL; query++) {
395 		/* strip leading path name component */
396 		if ((cp = strrchr(name, '/')) != NULL)
397 			name = cp + 1;
398 		/* strip SCCS or RCS suffix/prefix */
399 		if (strlen(name) > 2 && strncmp(name, "s.", 2) == 0)
400 			name += 2;
401 		if ((s = strlen(name)) > 2 && strcmp(name + s - 2, ",v") == 0)
402 			name[s - 2] = '\0';
403 		/* compression suffix */
404 		s = strlen(name);
405 		if (s > 2 &&
406 		    (strcmp(name + s - 2, ".z") == 0 ||
407 		     strcmp(name + s - 2, ".Z") == 0))
408 			name[s - 2] = '\0';
409 		else if (s > 3 &&
410 			 strcmp(name + s - 3, ".gz") == 0)
411 			name[s - 3] = '\0';
412 		else if (s > 4 &&
413 			 strcmp(name + s - 4, ".bz2") == 0)
414 			name[s - 4] = '\0';
415 
416 		unusual = 0;
417 		bin = man = src = NULL;
418 		s = strlen(name);
419 
420 		if (opt_b) {
421 			/*
422 			 * Binaries have to match exactly, and must be regular
423 			 * executable files.
424 			 */
425 			unusual = unusual | NO_BIN_FOUND;
426 			for (dp = bindirs; *dp != NULL; dp++) {
427 				cp = malloc(strlen(*dp) + 1 + s + 1);
428 				if (cp == NULL)
429 					abort();
430 				strcpy(cp, *dp);
431 				strcat(cp, "/");
432 				strcat(cp, name);
433 				if (stat(cp, &sb) == 0 &&
434 				    (sb.st_mode & S_IFMT) == S_IFREG &&
435 				    (sb.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
436 				    != 0) {
437 					unusual = unusual & ~NO_BIN_FOUND;
438 					if (bin == NULL) {
439 						bin = strdup(cp);
440 					} else {
441 						olen = strlen(bin);
442 						nlen = strlen(cp);
443 						bin = realloc(bin,
444 							      olen + nlen + 2);
445 						if (bin == 0)
446 							abort();
447 						strcat(bin, " ");
448 						strcat(bin, cp);
449 					}
450 					if (!opt_a) {
451 						free(cp);
452 						break;
453 					}
454 				}
455 				free(cp);
456 			}
457 		}
458 
459 		if (opt_m) {
460 			/*
461 			 * Ask the man command to perform the search for us.
462 			 */
463 			unusual = unusual | NO_MAN_FOUND;
464 			if (opt_a)
465 				cp = malloc(sizeof MANWHEREISALLCMD - 2 + s);
466 			else
467 				cp = malloc(sizeof MANWHEREISCMD - 2 + s);
468 
469 			if (cp == NULL)
470 				abort();
471 
472 			if (opt_a)
473 				sprintf(cp, MANWHEREISALLCMD, name);
474 			else
475 				sprintf(cp, MANWHEREISCMD, name);
476 
477 			if ((p = popen(cp, "r")) != NULL) {
478 
479 				while (fgets(buf, BUFSIZ - 1, p) != NULL) {
480 					unusual = unusual & ~NO_MAN_FOUND;
481 
482 					if ((cp2 = strchr(buf, '\n')) != NULL)
483 						*cp2 = '\0';
484 					if (regexec(&re, buf, 2,
485 						    matches, 0) == 0 &&
486 					    (rlen = matches[1].rm_eo -
487 					     matches[1].rm_so) > 0) {
488 						/*
489 						 * man -w found formated
490 						 * page, need to pick up
491 						 * source page name.
492 						 */
493 						cp2 = malloc(rlen + 1);
494 						if (cp2 == NULL)
495 							abort();
496 						memcpy(cp2,
497 						       buf + matches[1].rm_so,
498 						       rlen);
499 						cp2[rlen] = '\0';
500 					} else {
501 						/*
502 						 * man -w found plain source
503 						 * page, use it.
504 						 */
505 						s = strlen(buf);
506 						cp2 = malloc(s + 1);
507 						if (cp2 == NULL)
508 							abort();
509 						strcpy(cp2, buf);
510 					}
511 
512 					if (man == NULL) {
513 						man = strdup(cp2);
514 					} else {
515 						olen = strlen(man);
516 						nlen = strlen(cp2);
517 						man = realloc(man,
518 							      olen + nlen + 2);
519 						if (man == 0)
520 							abort();
521 						strcat(man, " ");
522 						strcat(man, cp2);
523 					}
524 
525 					free(cp2);
526 
527 					if (!opt_a)
528 						break;
529 				}
530 				pclose(p);
531 				free(cp);
532 			}
533 		}
534 
535 		if (opt_s) {
536 			/*
537 			 * Sources match if a subdir with the exact
538 			 * name is found.
539 			 */
540 			unusual = unusual | NO_SRC_FOUND;
541 			for (dp = sourcedirs; *dp != NULL; dp++) {
542 				cp = malloc(strlen(*dp) + 1 + s + 1);
543 				if (cp == NULL)
544 					abort();
545 				strcpy(cp, *dp);
546 				strcat(cp, "/");
547 				strcat(cp, name);
548 				if (stat(cp, &sb) == 0 &&
549 				    (sb.st_mode & S_IFMT) == S_IFDIR) {
550 					unusual = unusual & ~NO_SRC_FOUND;
551 					if (src == NULL) {
552 						src = strdup(cp);
553 					} else {
554 						olen = strlen(src);
555 						nlen = strlen(cp);
556 						src = realloc(src,
557 							      olen + nlen + 2);
558 						if (src == 0)
559 							abort();
560 						strcat(src, " ");
561 						strcat(src, cp);
562 					}
563 					if (!opt_a) {
564 						free(cp);
565 						break;
566 					}
567 				}
568 				free(cp);
569 			}
570 			/*
571 			 * If still not found, ask locate to search it
572 			 * for us.  This will find sources for things
573 			 * like lpr that are well hidden in the
574 			 * /usr/src tree, but takes a lot longer.
575 			 * Thus, option -x (`expensive') prevents this
576 			 * search.
577 			 *
578 			 * Do only match locate output that starts
579 			 * with one of our source directories, and at
580 			 * least one further level of subdirectories.
581 			 */
582 			if (opt_x || (src && !opt_a))
583 				goto done_sources;
584 
585 			cp = malloc(sizeof LOCATECMD - 2 + s);
586 			if (cp == NULL)
587 				abort();
588 			sprintf(cp, LOCATECMD, name);
589 			if ((p = popen(cp, "r")) == NULL)
590 				goto done_sources;
591 			while ((src == NULL || opt_a) &&
592 			       (fgets(buf, BUFSIZ - 1, p)) != NULL) {
593 				if ((cp2 = strchr(buf, '\n')) != NULL)
594 					*cp2 = '\0';
595 				for (dp = sourcedirs;
596 				     (src == NULL || opt_a) && *dp != NULL;
597 				     dp++) {
598 					cp2 = malloc(strlen(*dp) + 9);
599 					if (cp2 == NULL)
600 						abort();
601 					strcpy(cp2, "^");
602 					strcat(cp2, *dp);
603 					strcat(cp2, "/[^/]+/");
604 					if ((i = regcomp(&re2, cp2,
605 							 REG_EXTENDED|REG_NOSUB))
606 					    != 0) {
607 						regerror(i, &re, buf,
608 							 BUFSIZ - 1);
609 						errx(EX_UNAVAILABLE,
610 						     "regcomp(%s) failed: %s",
611 						     cp2, buf);
612 					}
613 					free(cp2);
614 					if (regexec(&re2, buf, 0,
615 						    (regmatch_t *)NULL, 0)
616 					    == 0) {
617 						unusual = unusual &
618 						          ~NO_SRC_FOUND;
619 						if (src == NULL) {
620 							src = strdup(buf);
621 						} else {
622 							olen = strlen(src);
623 							nlen = strlen(buf);
624 							src = realloc(src,
625 								      olen +
626 								      nlen + 2);
627 							if (src == 0)
628 								abort();
629 							strcat(src, " ");
630 							strcat(src, buf);
631 						}
632 					}
633 					regfree(&re2);
634 				}
635 			}
636 			pclose(p);
637 			free(cp);
638 		}
639 	  done_sources:
640 
641 		if (opt_u && !unusual)
642 			continue;
643 
644 		printed = 0;
645 		if (!opt_q) {
646 			printf("%s:", name);
647 			printed++;
648 		}
649 		if (bin) {
650 			if (printed++)
651 				putchar(' ');
652 			fputs(bin, stdout);
653 		}
654 		if (man) {
655 			if (printed++)
656 				putchar(' ');
657 			fputs(man, stdout);
658 		}
659 		if (src) {
660 			if (printed++)
661 				putchar(' ');
662 			fputs(src, stdout);
663 		}
664 		if (printed)
665 			putchar('\n');
666 	}
667 
668 	if (opt_m)
669 		regfree(&re);
670 
671 	return (0);
672 }
673