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util_path: Add functions to test path is read/write-only

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For root the functions util_path_is_readable() and util_path_is_writable()
do not take the path's permissions into account. The function access()
succeeds as root is allowed to read/write any file regardless of its
permissions.

Introduce the functions util_path_is_readonly_file() and
util_path_is_writeonly_file() to test whether a path is a regular file and
is either read-only (neither user, group, nor other have write permission,
but one or more of user, group, and other have read permission) or
write-only (neither user, group, nor other have read permission, but one
or more of user, group, and other have write permission).

Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Jens Remus
2018-12-12 13:59:56 +01:00
committed by Jan Höppner
parent 1f607fed3d
commit f4b2da6c9d
2 changed files with 59 additions and 2 deletions
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4
include/lib/util_path.h
View File

@@ -3,7 +3,7 @@
* @{
* @brief Work with paths
*
* Copyright IBM Corp. 2016, 2017
* Copyright IBM Corp. 2016, 2019
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
@@ -21,5 +21,7 @@ bool util_path_is_writable(const char *fmt, ...);
bool util_path_is_dir(const char *fmt, ...);
bool util_path_is_reg_file(const char *fmt, ...);
bool util_path_exists(const char *fmt, ...);
bool util_path_is_readonly_file(const char *fmt, ...);
bool util_path_is_writeonly_file(const char *fmt, ...);
#endif /** LIB_UTIL_PATH_H @} */

57
libutil/util_path.c
View File

@@ -3,7 +3,7 @@
*
* Work with paths
*
* Copyright IBM Corp. 2016, 2017
* Copyright IBM Corp. 2016, 2019
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
@@ -217,3 +217,58 @@ bool util_path_exists(const char *fmt, ...)
free(path);
return rc;
}
/**
* Test if path exists, is a regular file, and permission is read-only
*
* @param[in] fmt Format string for path to test
* @param[in] ... Variable arguments for format string
*
* @returns true Path exists, is a regular file, and permission does
* not allow any write but allows read
* false Otherwise
*/
bool util_path_is_readonly_file(const char *fmt, ...)
{
bool rc = false;
struct stat sb;
va_list ap;
char *path;
UTIL_VASPRINTF(&path, fmt, ap);
if (stat(path, &sb) == 0) {
rc = S_ISREG(sb.st_mode) &&
(sb.st_mode & 0222) == 0 &&
(sb.st_mode & 0444) != 0;
}
free(path);
return rc;
}
/**
* Test if path exists, is a regular file, and permission is write-only
*
* @param[in] fmt Format string for path to test
* @param[in] ... Variable arguments for format string
*
* @returns true Path exists, is a regular file, and permission does
* not allow any read but allows write
* false Otherwise
*/
bool util_path_is_writeonly_file(const char *fmt, ...)
{
bool rc = false;
struct stat sb;
va_list ap;
char *path;
UTIL_VASPRINTF(&path, fmt, ap);
if (stat(path, &sb) == 0) {
rc = S_ISREG(sb.st_mode) &&
(sb.st_mode & 0222) != 0 &&
(sb.st_mode & 0444) == 0;
}
free(path);
return rc;
}