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/*
* CU sudo version 1.5.2
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 1, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Please send bugs, changes, problems to sudo-bugs@courtesan.com
*
*******************************************************************
*
* This module contains the find_path() function that returns
* TRUE if the command was found and FALSE if not.
* If find_path() returns TRUE, the copyin paramters command and
* ocommand contain the resolved and unresolved pathnames respectively.
* NOTE: if "." or "" exists in PATH it will be searched last.
*
* Todd C. Miller (millert@colorado.edu) Sat Mar 25 21:50:36 MST 1995
*/
#ifndef lint
static char rcsid[] = "$Id$";
#endif /* lint */
#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 */
#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
#include <malloc.h>
#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
#include <errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include "sudo.h"
#include <options.h>
#ifndef STDC_HEADERS
#ifndef __GNUC__ /* gcc has its own malloc */
extern char *malloc __P((size_t));
#endif /* __GNUC__ */
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 *));
#ifdef HAVE_STRDUP
extern char *strdup __P((const char *));
#endif /* HAVE_STRDUP */
#endif /* !STDC_HEADERS */
#ifndef _S_IFMT
#define _S_IFMT S_IFMT
#endif /* _S_IFMT */
#ifndef _S_IFLNK
#define _S_IFLNK S_IFLNK
#endif /* _S_IFLNK */
/*******************************************************************
*
* find_path()
*
* this function finds the full pathname for a command and
* stores it in a statically allocated array, returning a pointer
* to the array.
*/
char * find_path(file)
char *file; /* file to find */
{
static char command[MAXPATHLEN + 1]; /* qualified filename */
register 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 */
#ifndef IGNORE_DOT_PATH
int checkdot = 0; /* check current dir? */
#endif /* IGNORE_DOT_PATH */
command[0] = '\0';
if (strlen(file) > MAXPATHLEN) {
errno = ENAMETOOLONG;
(void) fprintf(stderr, "%s: path too long: %s\n", Argv[0], file);
exit(1);
}
/*
* If we were given a fully qualified or relative path
* there is no need to look at PATH.
* We really want to fall back if !sudo_goodpath() but then
* the error is "not found" -- this way we get the correct error.
*/
if (strchr(file, '/')) {
(void) strcpy(command, file);
if (sudo_goodpath(command)) {
return(command);
} else {
(void) fprintf(stderr, "%s: %s: ", Argv[0], command);
perror("");
exit(1);
}
}
/*
* grab PATH out of environment and make a local copy
*/
if ((path = getenv("PATH")) == NULL)
return(NULL);
if ((path = (char *) strdup(path)) == NULL) {
(void) fprintf(stderr, "%s: out of memory!\n", Argv[0]);
exit(1);
}
origpath=path;
/* XXX use strtok() */
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')) {
#ifndef IGNORE_DOT_PATH
checkdot = 1;
#endif /* IGNORE_DOT_PATH */
path = n + 1;
continue;
}
/*
* resolve the path and exit the loop if found
*/
if (strlen(path) + strlen(file) + 1 >= MAXPATHLEN) {
(void) fprintf(stderr, "%s: path too long: %s\n", Argv[0], file);
exit(1);
}
(void) sprintf(command, "%s/%s", path, file);
if ((result = sudo_goodpath(command)))
break;
path = n + 1;
} while (n);
#ifndef IGNORE_DOT_PATH
/*
* check current dir if dot was in the PATH
*/
if (!result && checkdot)
result = sudo_goodpath(file);
#endif /* IGNORE_DOT_PATH */
(void) free(origpath);
return(result);
}
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