147 lines
4 KiB
C
147 lines
4 KiB
C
/*
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* 9p utilities (Darwin Implementation)
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/xattr.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "9p-util.h"
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ssize_t fgetxattrat_nofollow(int dirfd, const char *filename, const char *name,
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void *value, size_t size)
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{
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int ret;
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int fd = openat_file(dirfd, filename,
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O_RDONLY | O_PATH_9P_UTIL | O_NOFOLLOW, 0);
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if (fd == -1) {
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return -1;
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}
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ret = fgetxattr(fd, name, value, size, 0, 0);
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close_preserve_errno(fd);
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return ret;
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}
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ssize_t flistxattrat_nofollow(int dirfd, const char *filename,
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char *list, size_t size)
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{
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int ret;
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int fd = openat_file(dirfd, filename,
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O_RDONLY | O_PATH_9P_UTIL | O_NOFOLLOW, 0);
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if (fd == -1) {
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return -1;
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}
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ret = flistxattr(fd, list, size, 0);
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close_preserve_errno(fd);
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return ret;
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}
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ssize_t fremovexattrat_nofollow(int dirfd, const char *filename,
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const char *name)
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{
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int ret;
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int fd = openat_file(dirfd, filename, O_PATH_9P_UTIL | O_NOFOLLOW, 0);
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if (fd == -1) {
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return -1;
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}
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ret = fremovexattr(fd, name, 0);
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close_preserve_errno(fd);
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return ret;
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}
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int fsetxattrat_nofollow(int dirfd, const char *filename, const char *name,
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void *value, size_t size, int flags)
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{
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int ret;
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int fd = openat_file(dirfd, filename, O_PATH_9P_UTIL | O_NOFOLLOW, 0);
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if (fd == -1) {
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return -1;
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}
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ret = fsetxattr(fd, name, value, size, 0, flags);
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close_preserve_errno(fd);
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return ret;
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}
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/*
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* As long as mknodat is not available on macOS, this workaround
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* using pthread_fchdir_np is needed.
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*
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* Radar filed with Apple for implementing mknodat:
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* rdar://FB9862426 (https://openradar.appspot.com/FB9862426)
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*/
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#if defined CONFIG_PTHREAD_FCHDIR_NP
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static int create_socket_file_at_cwd(const char *filename, mode_t mode) {
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int fd, err;
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struct sockaddr_un addr = {
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.sun_family = AF_UNIX
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};
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err = snprintf(addr.sun_path, sizeof(addr.sun_path), "./%s", filename);
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if (err < 0 || err >= sizeof(addr.sun_path)) {
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errno = ENAMETOOLONG;
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return -1;
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}
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fd = socket(PF_UNIX, SOCK_DGRAM, 0);
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if (fd == -1) {
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return fd;
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}
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err = bind(fd, (struct sockaddr *) &addr, sizeof(addr));
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if (err == -1) {
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goto out;
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}
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/*
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* FIXME: Should rather be using descriptor-based fchmod() on the
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* socket file descriptor above (preferably before bind() call),
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* instead of path-based fchmodat(), to prevent concurrent transient
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* state issues between creating the named FIFO file at bind() and
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* delayed adjustment of permissions at fchmodat(). However currently
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* macOS (12.x) does not support such operations on socket file
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* descriptors yet.
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*
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* Filed report with Apple: FB9997731
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*/
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err = fchmodat(AT_FDCWD, filename, mode, AT_SYMLINK_NOFOLLOW);
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out:
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close_preserve_errno(fd);
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return err;
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}
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int qemu_mknodat(int dirfd, const char *filename, mode_t mode, dev_t dev)
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{
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int preserved_errno, err;
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if (S_ISREG(mode) || !(mode & S_IFMT)) {
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int fd = openat_file(dirfd, filename, O_CREAT, mode);
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if (fd == -1) {
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return fd;
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}
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close(fd);
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return 0;
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}
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if (!pthread_fchdir_np) {
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error_report_once("pthread_fchdir_np() not available on this version of macOS");
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errno = ENOTSUP;
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return -1;
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}
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if (pthread_fchdir_np(dirfd) < 0) {
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return -1;
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}
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if (S_ISSOCK(mode)) {
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err = create_socket_file_at_cwd(filename, mode);
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} else {
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err = mknod(filename, mode, dev);
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}
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preserved_errno = errno;
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/* Stop using the thread-local cwd */
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pthread_fchdir_np(-1);
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if (err < 0) {
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errno = preserved_errno;
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}
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return err;
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}
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#endif
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