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1999-08-25 Mark Kettenis <kettenis@gnu.org> * sysdeps/unix/sysv/linux/ptsname.c: Add checks to make sure we're really dealing with a master pseudo terminal, and really returning the name of the associated slave pseudo terminal by checking the device number. * sysdeps/unix/sysv/linux/pty-private.h: Removed. * login/programs/pt_chown.c (do_pt_chown): Don't use unix98_pseudo_p.
168 lines
4.8 KiB
C
168 lines
4.8 KiB
C
/* Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <paths.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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#include <termios.h>
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#include <unistd.h>
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#include <stdio-common/_itoa.h>
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/* Check if DEV corresponds to a master pseudo terminal device. */
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#define MASTER_P(Dev) \
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(major ((Dev)) == 2 \
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|| (major ((Dev)) == 4 && minor ((Dev)) >= 128 && minor ((Dev)) < 192) \
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|| (major ((Dev)) >= 128 && major ((Dev)) < 136))
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/* Check if DEV corresponds to a master pseudo terminal device. */
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#define SLAVE_P(Dev) \
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(major ((Dev)) == 3 \
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|| (major ((Dev)) == 4 && minor ((Dev)) >= 192 && minor ((Dev)) < 256) \
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|| (major ((Dev)) >= 136 && major ((Dev)) < 144))
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/* Note that major number 4 corresponds to the old BSD style pseudo
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terminal devices. As of Linux 2.1.115 these are no longer
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supported. They have been replaced by major numbers 2 (masters)
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and 3 (slaves). */
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/* Directory where we can find the slave pty nodes. */
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#define _PATH_DEVPTS "/dev/pts/"
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/* The are declared in getpt.c. */
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extern const char __libc_ptyname1[];
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extern const char __libc_ptyname2[];
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/* Static buffer for `ptsname'. */
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static char buffer[sizeof (_PATH_DEVPTS) + 20];
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/* Return the pathname of the pseudo terminal slave assoicated with
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the master FD is open on, or NULL on errors.
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The returned storage is good until the next call to this function. */
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char *
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ptsname (int fd)
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{
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return __ptsname_r (fd, buffer, sizeof (buffer)) != 0 ? NULL : buffer;
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}
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/* Store at most BUFLEN characters of the pathname of the slave pseudo
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terminal associated with the master FD is open on in BUF.
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Return 0 on success, otherwise an error number. */
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int
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__ptsname_r (int fd, char *buf, size_t buflen)
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{
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int save_errno = errno;
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struct stat st;
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int ptyno;
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if (buf == NULL)
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{
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__set_errno (EINVAL);
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return EINVAL;
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}
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if (!__isatty (fd))
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{
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__set_errno (ENOTTY);
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return ENOTTY;
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}
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#ifdef TIOCGPTN
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if (__ioctl (fd, TIOCGPTN, &ptyno) == 0)
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{
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/* Buffer we use to print the number in. For a maximum size for
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`int' of 8 bytes we never need more than 20 digits. */
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char numbuf[21];
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const char *devpts = _PATH_DEVPTS;
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const size_t devptslen = strlen (devpts);
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char *p;
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numbuf[20] = '\0';
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p = _itoa_word (ptyno, &numbuf[20], 10, 0);
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if (buflen < devptslen + strlen (p) + 1)
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{
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__set_errno (ERANGE);
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return ERANGE;
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}
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__stpcpy (__stpcpy (buf, devpts), p);
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}
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else if (errno == EINVAL)
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#endif
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{
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char *p;
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if (buflen < strlen (_PATH_TTY) + 3)
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{
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__set_errno (ERANGE);
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return ERANGE;
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}
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if (__fstat (fd, &st) < 0)
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return errno;
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/* Check if FD really is a master pseudo terminal. */
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if (! MASTER_P (st.st_rdev))
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{
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__set_errno (ENOTTY);
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return ENOTTY;
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}
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ptyno = minor (st.st_rdev);
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/* This is for the old BSD pseudo terminals. As of Linux
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2.1.115 these are no longer supported. */
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if (major (st.st_rdev) == 4)
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ptyno -= 128;
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if (ptyno / 16 >= strlen (__libc_ptyname1))
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{
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__set_errno (ENOTTY);
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return ENOTTY;
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}
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p = __stpcpy (buf, _PATH_TTY);
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p[0] = __libc_ptyname1[ptyno / 16];
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p[1] = __libc_ptyname2[ptyno % 16];
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p[2] = '\0';
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}
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if (__xstat (_STAT_VER, buf, &st) < 0)
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return errno;
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/* Check if the name we're about to return really corresponds to a
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slave pseudo terminal. */
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if (! S_ISCHR (st.st_mode) || ! SLAVE_P (st.st_rdev))
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{
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/* This really is a configuration problem. */
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__set_errno (ENOTTY);
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return ENOTTY;
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}
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__set_errno (save_errno);
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return 0;
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}
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weak_alias (__ptsname_r, ptsname_r)
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