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8ef1791950
When the target path finishes with a slash, __file_name_split_at returns an empty file name. We can test for this to refuse doing the link.
120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
/* Create a device file relative to an open directory. Hurd version.
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Copyright (C) 1991-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <sys/stat.h>
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#include <hurd.h>
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#include <hurd/fd.h>
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#include <hurd/paths.h>
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#include <fcntl.h>
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#include <_itoa.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/sysmacros.h>
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#include <shlib-compat.h>
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/* Create a device file named PATH relative to FD, with permission and
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special bits MODE and device number DEV (which can be constructed
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from major and minor device numbers with the `makedev' macro
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above). */
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int
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__mknodat (int fd, const char *path, mode_t mode, dev_t dev)
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{
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error_t errnode, err;
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file_t dir, node;
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char *name;
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char buf[100], *bp;
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const char *translator;
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size_t len;
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if (S_ISCHR (mode))
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{
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translator = _HURD_CHRDEV;
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len = sizeof (_HURD_CHRDEV);
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}
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else if (S_ISBLK (mode))
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{
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translator = _HURD_BLKDEV;
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len = sizeof (_HURD_BLKDEV);
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}
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else if (S_ISFIFO (mode))
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{
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translator = _HURD_FIFO;
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len = sizeof (_HURD_FIFO);
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}
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else if (S_ISREG (mode))
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{
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translator = NULL;
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len = 0;
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}
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else
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return __hurd_fail (EINVAL);
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if (translator != NULL && ! S_ISFIFO (mode))
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{
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/* We set the translator to "ifmt\0major\0minor\0", where IFMT
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depends on the S_IFMT bits of our MODE argument, and MAJOR and
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MINOR are ASCII decimal (octal or hex would do as well)
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representations of our arguments. Thus the convention is that
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CHRDEV and BLKDEV translators are invoked with two non-switch
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arguments, giving the major and minor device numbers in %i format. */
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bp = buf + sizeof (buf);
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*--bp = '\0';
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bp = _itoa (__gnu_dev_minor (dev), bp, 10, 0);
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*--bp = '\0';
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bp = _itoa (__gnu_dev_major (dev), bp, 10, 0);
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memcpy (bp - len, translator, len);
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translator = bp - len;
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len = buf + sizeof (buf) - translator;
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}
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dir = __file_name_split_at (fd, path, &name);
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if (dir == MACH_PORT_NULL)
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return -1;
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if (! *name)
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/* Can't link to the existing directory itself. */
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errnode = err = ENOTDIR;
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else
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/* Create a new, unlinked node in the target directory. */
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errnode = err = __dir_mkfile (dir, O_WRITE, (mode & ~S_IFMT) & ~_hurd_umask, &node);
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if (! err && translator != NULL)
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/* Set the node's translator to make it a device. */
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err = __file_set_translator (node,
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FS_TRANS_EXCL | FS_TRANS_SET,
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FS_TRANS_EXCL | FS_TRANS_SET, 0,
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translator, len,
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MACH_PORT_NULL, MACH_MSG_TYPE_COPY_SEND);
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if (! err)
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/* Link the node, now a valid device, into the target directory. */
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err = __dir_link (dir, node, name, 1);
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__mach_port_deallocate (__mach_task_self (), dir);
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if (! errnode)
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__mach_port_deallocate (__mach_task_self (), node);
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if (err)
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return __hurd_fail (err);
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return 0;
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}
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libc_hidden_def (__mknodat)
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weak_alias (__mknodat, mknodat)
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