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/* $OpenBSD: which.c,v 1.6 2002/02/16 21:27:59 millert Exp $ */
/*
* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef lint
static char rcsid[] = "$OpenBSD: which.c,v 1.6 2002/02/16 21:27:59 millert Exp $";
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define PROG_WHICH 1
#define PROG_WHEREIS 2
extern char *__progname;
int findprog(char *, char *, int, int);
void usage(void);
/*
* which(1) -- find an executable(s) in the user's path
* whereis(1) -- find an executable(s) in the default user path
*
* Return values:
* 0 - all executables found
* 1 - some found, some not
* 2 - none found
*/
int
main(argc, argv)
int argc;
char **argv;
{
char *path;
size_t n;
int ch, allmatches = 0, notfound = 0, progmode = PROG_WHICH;
(void)setlocale(LC_ALL, "");
if (argc == 1)
usage();
/* Don't accept command args but check since old whereis(1) used to */
while ((ch = getopt(argc, argv, "a")) != -1) {
switch (ch) {
case 'a':
allmatches = 1;
break;
default:
usage();
}
}
/*
* which(1) uses user's $PATH.
* whereis(1) uses user.cs_path from sysctl(3).
*/
if (strcmp(__progname, "whereis") == 0) {
int mib[2];
progmode = PROG_WHEREIS;
mib[0] = CTL_USER;
mib[1] = USER_CS_PATH;
if (sysctl(mib, 2, NULL, &n, NULL, 0) == -1)
err(1, "unable to get length of user.cs_path");
if (n == 0)
errx(1, "user.cs_path was zero length!");
if ((path = (char *)malloc(n)) == NULL)
errx(1, "can't allocate memory.");
if (sysctl(mib, 2, path, &n, NULL, 0) == -1)
err(1, "unable to get user.cs_path");
} else {
if ((path = getenv("PATH")) == NULL)
err(1, "can't get $PATH from environment");
}
/* To make access(2) do what we want */
if (setgid(getegid()))
err(1, "Can't set gid to %u", getegid());
if (setuid(geteuid()))
err(1, "Can't set uid to %u", geteuid());
for (n = optind; n < argc; n++)
if (findprog(argv[n], path, progmode, allmatches) == 0)
notfound++;
exit((notfound == 0) ? 0 : ((notfound == argc - 1) ? 2 : 1));
}
int
findprog(prog, path, progmode, allmatches)
char *prog;
char *path;
int progmode;
int allmatches;
{
char *p, filename[MAXPATHLEN];
int proglen, plen, rval = 0;
struct stat sbuf;
/* Special case if prog contains '/' */
if (strchr(prog, '/')) {
if ((stat(prog, &sbuf) == 0) && S_ISREG(sbuf.st_mode) &&
access(prog, X_OK) == 0) {
(void)puts(prog);
return(1);
} else {
(void)printf("%s: Command not found.\n", prog);
return(0);
}
}
if ((path = strdup(path)) == NULL)
errx(1, "Can't allocate memory.");
proglen = strlen(prog);
while ((p = strsep(&path, ":")) != NULL) {
if (*p == '\0')
p = ".";
plen = strlen(p);
while (p[plen-1] == '/')
p[--plen] = '\0'; /* strip trailing '/' */
if (plen + 1 + proglen >= sizeof(filename)) {
warnx("%s/%s: %s", p, prog, strerror(ENAMETOOLONG));
return(0);
}
(void)strcpy(filename, p);
filename[plen] = '/';
(void)strcpy(filename + plen + 1, prog);
if ((stat(filename, &sbuf) == 0) && S_ISREG(sbuf.st_mode) &&
access(filename, X_OK) == 0) {
(void)puts(filename);
rval = 1;
if (!allmatches)
return(rval);
}
}
(void)free(path);
/* whereis(1) is silent on failure. */
if (!rval && progmode != PROG_WHEREIS)
(void)printf("%s: Command not found.\n", prog);
return(rval);
}
void
usage()
{
(void) fprintf(stderr, "Usage: %s [-a] name [...]\n", __progname);
exit(1);
}
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