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/*
* Copyright (c) 1996, 1998, 1999 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.
*
* 4. Products derived from this software may not be called "Sudo" nor
* may "Sudo" appear in their names without specific prior written
* permission from the author.
*
* 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.
*/
#include "config.h"
#include <stdio.h>
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif /* STDC_HEADERS */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include "sudo.h"
#ifndef STDC_HEADERS
extern char *getenv __P((const char *));
extern char *strcpy __P((char *, const char *));
extern int fprintf __P((FILE *, const char *, ...));
extern ssize_t readlink __P((const char *, VOID *, size_t));
extern int stat __P((const char *, struct stat *));
extern int lstat __P((const char *, struct stat *));
#endif /* !STDC_HEADERS */
#ifndef lint
static const char rcsid[] = "$Sudo: find_path.c,v 1.95 2000/01/27 04:31:58 millert Exp $";
#endif /* lint */
/*
* This function finds the full pathname for a command and
* stores it in a statically allocated array, filling in a pointer
* to the array. Returns FOUND if the command was found, NOT_FOUND
* if it was not found, or NOT_FOUND_DOT if it would have been found
* but it is in '.' and IGNORE_DOT is set.
*/
int
find_path(infile, outfile)
char *infile; /* file to find */
char **outfile; /* result parameter */
{
static char command[MAXPATHLEN]; /* qualified filename */
char *n; /* for traversing path */
char *path = NULL; /* contents of PATH env var */
char *origpath; /* so we can free path later */
char *result = NULL; /* result of path/file lookup */
int checkdot = 0; /* check current dir? */
if (strlen(infile) >= MAXPATHLEN) {
(void) fprintf(stderr, "%s: path too long: %s\n", Argv[0], infile);
exit(1);
}
/*
* If we were given a fully qualified or relative path
* there is no need to look at $PATH.
*/
if (strchr(infile, '/')) {
(void) strcpy(command, infile);
if (sudo_goodpath(command)) {
*outfile = command;
return(FOUND);
} else
return(NOT_FOUND);
}
/*
* Grab PATH out of the environment (or from the string table
* if SECURE_PATH is in effect) and make a local copy.
*/
if (def_str(I_SECURE_PATH) && !user_is_exempt())
path = def_str(I_SECURE_PATH);
else if ((path = getenv("PATH")) == NULL)
return(NOT_FOUND);
path = estrdup(path);
origpath = path;
do {
if ((n = strchr(path, ':')))
*n = '\0';
/*
* Search current dir last if it is in PATH This will miss sneaky
* things like using './' or './/'
*/
if (*path == '\0' || (*path == '.' && *(path + 1) == '\0')) {
checkdot = 1;
path = n + 1;
continue;
}
/*
* Resolve the path and exit the loop if found.
*/
if (strlen(path) + strlen(infile) + 1 >= MAXPATHLEN) {
(void) fprintf(stderr, "%s: path too long: %s\n", Argv[0], infile);
exit(1);
}
(void) sprintf(command, "%s/%s", path, infile);
if ((result = sudo_goodpath(command)))
break;
path = n + 1;
} while (n);
free(origpath);
/*
* Check current dir if dot was in the PATH
*/
if (!result && checkdot) {
result = sudo_goodpath(infile);
if (result && def_flag(I_IGNORE_DOT))
return(NOT_FOUND_DOT);
}
if (result) {
*outfile = result;
return(FOUND);
} else
return(NOT_FOUND);
}
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