From 33cc3b9dd7bf3dae1c6cf86e46bb4923f96e7fff Mon Sep 17 00:00:00 2001 From: トトも <85485984+ElectronicsArchiver@users.noreply.github.com> Date: Sat, 16 Apr 2022 20:18:56 +0200 Subject: Source / Include Folder (#88) Moved Source Files Into `src` Folder --- fsade.c | 392 ---------------------------------------------------------------- 1 file changed, 392 deletions(-) delete mode 100644 fsade.c (limited to 'fsade.c') diff --git a/fsade.c b/fsade.c deleted file mode 100644 index 1444cf4..0000000 --- a/fsade.c +++ /dev/null @@ -1,392 +0,0 @@ -/**************************************************************************** - * bfs * - * Copyright (C) 2019-2021 Tavian Barnes * - * * - * Permission to use, copy, modify, and/or distribute this software for any * - * purpose with or without fee is hereby granted. * - * * - * 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. * - ****************************************************************************/ - -#include "fsade.h" -#include "bftw.h" -#include "dir.h" -#include "dstring.h" -#include "util.h" -#include -#include -#include -#include - -#if BFS_CAN_CHECK_ACL -# include -#endif - -#if BFS_CAN_CHECK_CAPABILITIES -# include -#endif - -#if BFS_HAS_SYS_EXTATTR -# include -#elif BFS_HAS_SYS_XATTR -# include -#endif - -#if BFS_CAN_CHECK_ACL || BFS_CAN_CHECK_CAPABILITIES || BFS_CAN_CHECK_XATTRS - -/** - * Many of the APIs used here don't have *at() variants, but we can try to - * emulate something similar if /proc/self/fd is available. - */ -static const char *fake_at(const struct BFTW *ftwbuf) { - static bool proc_works = true; - static bool proc_checked = false; - - char *path = NULL; - if (!proc_works || ftwbuf->at_fd == AT_FDCWD) { - goto fail; - } - - path = dstrprintf("/proc/self/fd/%d/", ftwbuf->at_fd); - if (!path) { - goto fail; - } - - if (!proc_checked) { - proc_checked = true; - if (xfaccessat(AT_FDCWD, path, F_OK) != 0) { - proc_works = false; - goto fail; - } - } - - if (dstrcat(&path, ftwbuf->at_path) != 0) { - goto fail; - } - - return path; - -fail: - dstrfree(path); - return ftwbuf->path; -} - -static void free_fake_at(const struct BFTW *ftwbuf, const char *path) { - if (path != ftwbuf->path) { - dstrfree((char *)path); - } -} - -/** - * Check if an error was caused by the absence of support or data for a feature. - */ -static bool is_absence_error(int error) { - // If the OS doesn't support the feature, it's obviously not enabled for - // any files - if (error == ENOTSUP) { - return true; - } - - // On Linux, ACLs and capabilities are implemented in terms of extended - // attributes, which report ENODATA/ENOATTR when missing - -#ifdef ENODATA - if (error == ENODATA) { - return true; - } -#endif - -#if defined(ENOATTR) && ENOATTR != ENODATA - if (error == ENOATTR) { - return true; - } -#endif - - // On at least FreeBSD and macOS, EINVAL is returned when the requested - // ACL type is not supported for that file - if (error == EINVAL) { - return true; - } - -#if __APPLE__ - // On macOS, ENOENT can also signal that a file has no ACLs - if (error == ENOENT) { - return true; - } -#endif - - return false; -} - -#endif // BFS_CAN_CHECK_ACL || BFS_CAN_CHECK_CAPABILITIES || BFS_CAN_CHECK_XATTRS - -#if BFS_CAN_CHECK_ACL - -/** Check if a POSIX.1e ACL is non-trivial. */ -static int bfs_check_posix1e_acl(acl_t acl, bool ignore_required) { - int ret = 0; - - acl_entry_t entry; - for (int status = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry); -#if __APPLE__ - // POSIX.1e specifies a return value of 1 for success, but macOS - // returns 0 instead - status == 0; -#else - status > 0; -#endif - status = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry)) { -#if defined(ACL_USER_OBJ) && defined(ACL_GROUP_OBJ) && defined(ACL_OTHER) - if (ignore_required) { - acl_tag_t tag; - if (acl_get_tag_type(entry, &tag) != 0) { - ret = -1; - continue; - } - if (tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ || tag == ACL_OTHER) { - continue; - } - } -#endif - - ret = 1; - break; - } - - return ret; -} - -/** Check if an ACL of the given type is non-trivial. */ -static int bfs_check_acl_type(acl_t acl, acl_type_t type) { - if (type == ACL_TYPE_DEFAULT) { - // For directory default ACLs, any entries make them non-trivial - return bfs_check_posix1e_acl(acl, false); - } - -#if __FreeBSD__ - int trivial; - -#if BFS_HAS_FEATURE(memory_sanitizer, false) - // msan seems to be missing an interceptor for acl_is_trivial_np() - trivial = 0; -#endif - - if (acl_is_trivial_np(acl, &trivial) < 0) { - return -1; - } else if (trivial) { - return 0; - } else { - return 1; - } -#else // !__FreeBSD__ - return bfs_check_posix1e_acl(acl, true); -#endif -} - -int bfs_check_acl(const struct BFTW *ftwbuf) { - static const acl_type_t acl_types[] = { -#if __APPLE__ - // macOS gives EINVAL for either of the two standard ACL types, - // supporting only ACL_TYPE_EXTENDED - ACL_TYPE_EXTENDED, -#else - // The two standard POSIX.1e ACL types - ACL_TYPE_ACCESS, - ACL_TYPE_DEFAULT, -#endif - -#ifdef ACL_TYPE_NFS4 - ACL_TYPE_NFS4, -#endif - }; - static const size_t n_acl_types = sizeof(acl_types)/sizeof(acl_types[0]); - - if (ftwbuf->type == BFS_LNK) { - return 0; - } - - const char *path = fake_at(ftwbuf); - - int ret = -1, error = 0; - for (size_t i = 0; i < n_acl_types && ret <= 0; ++i) { - acl_type_t type = acl_types[i]; - - if (type == ACL_TYPE_DEFAULT && ftwbuf->type != BFS_DIR) { - // ACL_TYPE_DEFAULT is supported only for directories, - // otherwise acl_get_file() gives EACCESS - continue; - } - - acl_t acl = acl_get_file(path, type); - if (!acl) { - error = errno; - if (is_absence_error(error)) { - ret = 0; - } - continue; - } - - ret = bfs_check_acl_type(acl, type); - error = errno; - acl_free(acl); - } - - free_fake_at(ftwbuf, path); - errno = error; - return ret; -} - -#else // !BFS_CAN_CHECK_ACL - -int bfs_check_acl(const struct BFTW *ftwbuf) { - errno = ENOTSUP; - return -1; -} - -#endif - -#if BFS_CAN_CHECK_CAPABILITIES - -int bfs_check_capabilities(const struct BFTW *ftwbuf) { - if (ftwbuf->type == BFS_LNK) { - return 0; - } - - int ret = -1, error; - const char *path = fake_at(ftwbuf); - - cap_t caps = cap_get_file(path); - if (!caps) { - error = errno; - if (is_absence_error(error)) { - ret = 0; - } - goto out_path; - } - - // TODO: Any better way to check for a non-empty capability set? - char *text = cap_to_text(caps, NULL); - if (!text) { - error = errno; - goto out_caps; - } - ret = text[0] ? 1 : 0; - - error = errno; - cap_free(text); -out_caps: - cap_free(caps); -out_path: - free_fake_at(ftwbuf, path); - errno = error; - return ret; -} - -#else // !BFS_CAN_CHECK_CAPABILITIES - -int bfs_check_capabilities(const struct BFTW *ftwbuf) { - errno = ENOTSUP; - return -1; -} - -#endif - -#if BFS_CAN_CHECK_XATTRS - -int bfs_check_xattrs(const struct BFTW *ftwbuf) { - const char *path = fake_at(ftwbuf); - ssize_t len; - -#if BFS_HAS_SYS_EXTATTR - ssize_t (*extattr_list)(const char *, int, void*, size_t) = - ftwbuf->type == BFS_LNK ? extattr_list_link : extattr_list_file; - - len = extattr_list(path, EXTATTR_NAMESPACE_SYSTEM, NULL, 0); - if (len <= 0) { - len = extattr_list(path, EXTATTR_NAMESPACE_USER, NULL, 0); - } -#elif __APPLE__ - int options = ftwbuf->type == BFS_LNK ? XATTR_NOFOLLOW : 0; - len = listxattr(path, NULL, 0, options); -#else - if (ftwbuf->type == BFS_LNK) { - len = llistxattr(path, NULL, 0); - } else { - len = listxattr(path, NULL, 0); - } -#endif - - int error = errno; - - free_fake_at(ftwbuf, path); - - if (len > 0) { - return 1; - } else if (len == 0 || is_absence_error(error)) { - return 0; - } else if (error == E2BIG) { - return 1; - } else { - errno = error; - return -1; - } -} - -int bfs_check_xattr_named(const struct BFTW *ftwbuf, const char *name) { - const char *path = fake_at(ftwbuf); - ssize_t len; - -#if BFS_HAS_SYS_EXTATTR - ssize_t (*extattr_get)(const char *, int, const char *, void*, size_t) = - ftwbuf->type == BFS_LNK ? extattr_get_link : extattr_get_file; - - len = extattr_get(path, EXTATTR_NAMESPACE_SYSTEM, name, NULL, 0); - if (len < 0) { - len = extattr_get(path, EXTATTR_NAMESPACE_USER, name, NULL, 0); - } -#elif __APPLE__ - int options = ftwbuf->type == BFS_LNK ? XATTR_NOFOLLOW : 0; - len = getxattr(path, name, NULL, 0, 0, options); -#else - if (ftwbuf->type == BFS_LNK) { - len = lgetxattr(path, name, NULL, 0); - } else { - len = getxattr(path, name, NULL, 0); - } -#endif - - int error = errno; - - free_fake_at(ftwbuf, path); - - if (len >= 0) { - return 1; - } else if (is_absence_error(error)) { - return 0; - } else if (error == E2BIG) { - return 1; - } else { - errno = error; - return -1; - } -} - -#else // !BFS_CAN_CHECK_XATTRS - -int bfs_check_xattrs(const struct BFTW *ftwbuf) { - errno = ENOTSUP; - return -1; -} - -int bfs_check_xattr_named(const struct BFTW *ftwbuf, const char *name) { - errno = ENOTSUP; - return -1; -} - -#endif -- cgit v1.2.3