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/* $OpenBSD: access.c,v 1.5 2010/01/12 23:22:06 nicm Exp $ */
/****************************************************************************
* Copyright (c) 1998-2006,2007 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/****************************************************************************
* Author: Thomas E. Dickey *
****************************************************************************/
#include <curses.priv.h>
#include <ctype.h>
#include <sys/stat.h>
#include <tic.h>
#include <nc_alloc.h>
MODULE_ID("$Id: access.c,v 1.5 2010/01/12 23:22:06 nicm Exp $")
#define LOWERCASE(c) ((isalpha(UChar(c)) && isupper(UChar(c))) ? tolower(UChar(c)) : (c))
NCURSES_EXPORT(char *)
_nc_rootname(char *path)
{
char *result = _nc_basename(path);
#if !MIXEDCASE_FILENAMES || defined(PROG_EXT)
static char *temp;
char *s;
temp = strdup(result);
result = temp;
#if !MIXEDCASE_FILENAMES
for (s = result; *s != '\0'; ++s) {
*s = LOWERCASE(*s);
}
#endif
#if defined(PROG_EXT)
if ((s = strrchr(result, '.')) != 0) {
if (!strcmp(s, PROG_EXT))
*s = '\0';
}
#endif
#endif
return result;
}
/*
* Check if a string appears to be an absolute pathname.
*/
NCURSES_EXPORT(bool)
_nc_is_abs_path(const char *path)
{
#if defined(__EMX__) || defined(__DJGPP__)
#define is_pathname(s) ((((s) != 0) && ((s)[0] == '/')) \
|| (((s)[0] != 0) && ((s)[1] == ':')))
#else
#define is_pathname(s) ((s) != 0 && (s)[0] == '/')
#endif
return is_pathname(path);
}
/*
* Return index of the basename
*/
NCURSES_EXPORT(unsigned)
_nc_pathlast(const char *path)
{
const char *test = strrchr(path, '/');
#ifdef __EMX__
if (test == 0)
test = strrchr(path, '\\');
#endif
if (test == 0)
test = path;
else
test++;
return (test - path);
}
NCURSES_EXPORT(char *)
_nc_basename(char *path)
{
return path + _nc_pathlast(path);
}
NCURSES_EXPORT(int)
_nc_access(const char *path, int mode)
{
if (access(path, mode) < 0) {
if ((mode & W_OK) != 0
&& errno == ENOENT
&& strlen(path) < PATH_MAX) {
char *leaf, head[PATH_MAX];
strlcpy(head, path, sizeof(head));
if ((leaf = _nc_basename(head)) == 0)
leaf = head;
*leaf = '\0';
if (head == leaf)
(void) strlcpy(head, ".", sizeof(head));
return access(head, R_OK | W_OK | X_OK);
}
return -1;
}
return 0;
}
NCURSES_EXPORT(bool)
_nc_is_dir_path(const char *path)
{
bool result = FALSE;
struct stat sb;
if (stat(path, &sb) == 0
&& (sb.st_mode & S_IFMT) == S_IFDIR) {
result = TRUE;
}
return result;
}
NCURSES_EXPORT(bool)
_nc_is_file_path(const char *path)
{
bool result = FALSE;
struct stat sb;
if (stat(path, &sb) == 0
&& (sb.st_mode & S_IFMT) == S_IFREG) {
result = TRUE;
}
return result;
}
#ifndef USE_ROOT_ENVIRON
/*
* Returns true if we allow application to use environment variables that are
* used for searching lists of directories, etc.
*/
NCURSES_EXPORT(int)
_nc_env_access(void)
{
#if HAVE_ISSETUGID
if (issetugid())
return FALSE;
#elif HAVE_GETEUID && HAVE_GETEGID
if (getuid() != geteuid()
|| getgid() != getegid())
return FALSE;
#endif
return getuid() != 0 && geteuid() != 0; /* ...finally, disallow root */
}
#endif
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