150 lines
4.2 KiB
C
150 lines
4.2 KiB
C
/* $NetBSD: whereis.c,v 1.17 2004/05/23 02:24:06 christos Exp $ */
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/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)whereis.c 8.3 (Berkeley) 5/4/95";
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#endif
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__RCSID("$NetBSD: whereis.c,v 1.17 2004/05/23 02:24:06 christos Exp $");
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static void usage(void) __attribute__((__noreturn__));
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int
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main(int argc, char *argv[])
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{
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struct stat sb;
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size_t len;
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int ch, mib[2];
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char *p, *std, path[MAXPATHLEN];
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const char *t;
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int which = strcmp(getprogname(), "which") == 0;
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int useenvpath = which, found = 0;
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gid_t egid = getegid();
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uid_t euid = geteuid();
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/* To make access(2) do what we want */
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if (setgid(egid) == -1)
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err(1, "Can't set gid to %lu", (unsigned long)egid);
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if (setuid(euid) == -1)
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err(1, "Can't set uid to %lu", (unsigned long)euid);
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while ((ch = getopt(argc, argv, "ap")) != -1)
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switch (ch) {
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case 'a':
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which = 0;
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break;
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case 'p':
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useenvpath = 1; /* use environment for PATH */
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc == 0)
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usage();
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if (useenvpath) {
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if ((std = getenv("PATH")) == NULL)
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errx(1, "PATH environment variable is not set");
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} else {
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/* Retrieve the standard path. */
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mib[0] = CTL_USER;
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mib[1] = USER_CS_PATH;
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if (sysctl(mib, 2, NULL, &len, NULL, 0) == -1)
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err(1, "sysctl: user.cs_path");
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if (len == 0)
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errx(1, "sysctl: user.cs_path (zero length)");
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if ((std = malloc(len)) == NULL)
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err(1, NULL);
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if (sysctl(mib, 2, std, &len, NULL, 0) == -1)
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err(1, "sysctl: user.cs_path");
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}
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/* For each path, for each program... */
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for (; *argv; ++argv)
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for (p = std; p; p && (*p++ = ':')) {
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t = p;
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if ((p = strchr(p, ':')) != NULL) {
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*p = '\0';
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if (t == p)
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t = ".";
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} else
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if (strlen(t) == 0)
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t = ".";
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(void)snprintf(path, sizeof(path), "%s/%s", t, *argv);
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len = snprintf(path, sizeof(path), "%s/%s", t, *argv);
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if (len >= sizeof(path))
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continue;
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if (stat(path, &sb) == -1)
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continue;
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if (!S_ISREG(sb.st_mode))
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continue;
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if (access(path, X_OK) == -1)
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continue;
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(void)printf("%s\n", path);
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found++;
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if (which)
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break;
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}
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return ((found == 0) ? 3 : ((found >= argc) ? 0 : 2));
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "Usage: %s [-ap] program [...]\n", getprogname());
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exit(1);
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}
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