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/*
* Copyright (c) 1996, 1998-2005 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
#endif /* HAVE_STRING_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_ERR_H
# include <err.h>
#else
# include "emul/err.h"
#endif /* HAVE_ERR_H */
#include "sudo.h"
#ifndef lint
__unused static const char rcsid[] = "$Sudo: find_path.c,v 1.108.2.4 2007/06/12 01:43:01 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, sbp, path)
char *infile; /* file to find */
char **outfile; /* result parameter */
struct stat *sbp; /* stat result parameter */
char *path; /* path to search */
{
static char command[PATH_MAX]; /* qualified filename */
char *n; /* for traversing path */
char *origpath; /* so we can free path later */
char *result = NULL; /* result of path/file lookup */
int checkdot = 0; /* check current dir? */
int len; /* length parameter */
if (strlen(infile) >= PATH_MAX)
errx(1, "%s: File name too long", infile);
/*
* If we were given a fully qualified or relative path
* there is no need to look at $PATH.
*/
if (strchr(infile, '/')) {
strlcpy(command, infile, sizeof(command)); /* paranoia */
if (sudo_goodpath(command, sbp)) {
*outfile = command;
return(FOUND);
} else
return(NOT_FOUND);
}
/* Use PATH passed in unless SECURE_PATH is in effect. */
#ifdef SECURE_PATH
if (!user_is_exempt())
path = SECURE_PATH;
#endif /* SECURE_PATH */
if (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.
*/
len = snprintf(command, sizeof(command), "%s/%s", path, infile);
if (len <= 0 || len >= sizeof(command))
errx(1, "%s: File name too long", infile);
if ((result = sudo_goodpath(command, sbp)))
break;
path = n + 1;
} while (n);
efree(origpath);
/*
* Check current dir if dot was in the PATH
*/
if (!result && checkdot) {
result = sudo_goodpath(infile, sbp);
if (result && def_ignore_dot)
return(NOT_FOUND_DOT);
}
if (result) {
*outfile = result;
return(FOUND);
} else
return(NOT_FOUND);
}
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