148 lines
3.4 KiB
C
148 lines
3.4 KiB
C
/**
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* Copyright (c) 2000 Dan Papasian. 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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <err.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);
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static int print_matches(char *, char *);
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int silent;
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int allpaths;
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int
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main(int argc, char **argv)
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{
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char *p, *path;
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ssize_t pathlen;
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int opt, status;
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status = EXIT_SUCCESS;
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/* If called without args, die silently to conform */
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if (argc < 2)
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exit(EXIT_FAILURE);
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while ((opt = getopt(argc, argv, "as")) != -1) {
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switch (opt) {
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case 'a':
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allpaths = 1;
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break;
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case 's':
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silent = 1;
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break;
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default:
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usage();
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break;
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}
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}
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argv += optind;
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argc -= optind;
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if ((p = getenv("PATH")) == NULL)
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exit(EXIT_FAILURE);
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pathlen = strlen(p) + 1;
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path = malloc(pathlen);
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if (path == NULL)
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err(EXIT_FAILURE, NULL);
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if (argc == 0)
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status = EXIT_FAILURE;
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while (argc > 0) {
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memcpy(path, p, pathlen);
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if (strlen(*argv) > FILENAME_MAX ||
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print_matches(path, *argv) == -1)
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status = EXIT_FAILURE;
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argv++;
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argc--;
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}
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exit(status);
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}
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static void
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usage(void)
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{
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errx(EXIT_FAILURE, "usage: which [-as] program ...");
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}
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static int
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is_there(char *candidate)
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{
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struct stat fin;
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/* XXX work around access(2) false positives for superuser */
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if (access(candidate, X_OK) == 0 &&
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stat(candidate, &fin) == 0 &&
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S_ISREG(fin.st_mode) &&
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(getuid() != 0 ||
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(fin.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0)) {
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if (!silent)
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printf("%s\n", candidate);
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return (1);
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}
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return (0);
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}
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static int
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print_matches(char *path, char *filename)
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{
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char candidate[PATH_MAX];
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char *d;
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int found;
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if (*filename == '/')
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return (is_there(filename) ? 0 : -1);
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found = 0;
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while ((d = strsep(&path, ":")) != NULL) {
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if (snprintf(candidate, sizeof(candidate), "%s/%s", d,
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filename) >= (int)sizeof(candidate))
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continue;
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if (is_there(candidate)) {
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found = 1;
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if (!allpaths)
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break;
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}
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}
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return (found ? 0 : -1);
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}
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