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-rw-r--r--sysdeps/unix/grantpt.c260
1 files changed, 0 insertions, 260 deletions
diff --git a/sysdeps/unix/grantpt.c b/sysdeps/unix/grantpt.c
deleted file mode 100644
index a73020e69a..0000000000
--- a/sysdeps/unix/grantpt.c
+++ /dev/null
@@ -1,260 +0,0 @@
-/* Copyright (C) 1998-2017 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-#include <assert.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <grp.h>
-#include <limits.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/resource.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <unistd.h>
-
-#include "pty-private.h"
-
-
-/* Return the result of ptsname_r in the buffer pointed to by PTS,
- which should be of length BUF_LEN. If it is too long to fit in
- this buffer, a sufficiently long buffer is allocated using malloc,
- and returned in PTS. 0 is returned upon success, -1 otherwise. */
-static int
-pts_name (int fd, char **pts, size_t buf_len, struct stat64 *stp)
-{
- int rv;
- char *buf = *pts;
-
- for (;;)
- {
- char *new_buf;
-
- if (buf_len)
- {
- rv = __ptsname_internal (fd, buf, buf_len, stp);
- if (rv != 0)
- {
- if (rv == ENOTTY)
- /* ptsname_r returns with ENOTTY to indicate
- a descriptor not referring to a pty master.
- For this condition, grantpt must return EINVAL. */
- rv = EINVAL;
- errno = rv; /* Not necessarily set by __ptsname_r. */
- break;
- }
-
- if (memchr (buf, '\0', buf_len))
- /* We succeeded and the returned name fit in the buffer. */
- break;
-
- /* Try again with a longer buffer. */
- buf_len += buf_len; /* Double it */
- }
- else
- /* No initial buffer; start out by mallocing one. */
- buf_len = 128; /* First time guess. */
-
- if (buf != *pts)
- /* We've already malloced another buffer at least once. */
- new_buf = (char *) realloc (buf, buf_len);
- else
- new_buf = (char *) malloc (buf_len);
- if (! new_buf)
- {
- rv = -1;
- __set_errno (ENOMEM);
- break;
- }
- buf = new_buf;
- }
-
- if (rv == 0)
- *pts = buf; /* Return buffer to the user. */
- else if (buf != *pts)
- free (buf); /* Free what we malloced when returning an error. */
-
- return rv;
-}
-
-/* Change the ownership and access permission of the slave pseudo
- terminal associated with the master pseudo terminal specified
- by FD. */
-int
-grantpt (int fd)
-{
- int retval = -1;
-#ifdef PATH_MAX
- char _buf[PATH_MAX];
-#else
- char _buf[512];
-#endif
- char *buf = _buf;
- struct stat64 st;
-
- if (__glibc_unlikely (pts_name (fd, &buf, sizeof (_buf), &st)))
- {
- int save_errno = errno;
-
- /* Check, if the file descriptor is valid. pts_name returns the
- wrong errno number, so we cannot use that. */
- if (__libc_fcntl (fd, F_GETFD) == -1 && errno == EBADF)
- return -1;
-
- /* If the filedescriptor is no TTY, grantpt has to set errno
- to EINVAL. */
- if (save_errno == ENOTTY)
- __set_errno (EINVAL);
- else
- __set_errno (save_errno);
-
- return -1;
- }
-
- /* Make sure that we own the device. */
- uid_t uid = __getuid ();
- if (st.st_uid != uid)
- {
- if (__chown (buf, uid, st.st_gid) < 0)
- goto helper;
- }
-
- static int tty_gid = -1;
- if (__glibc_unlikely (tty_gid == -1))
- {
- char *grtmpbuf;
- struct group grbuf;
- size_t grbuflen = __sysconf (_SC_GETGR_R_SIZE_MAX);
- struct group *p;
-
- /* Get the group ID of the special `tty' group. */
- if (grbuflen == (size_t) -1L)
- /* `sysconf' does not support _SC_GETGR_R_SIZE_MAX.
- Try a moderate value. */
- grbuflen = 1024;
- grtmpbuf = (char *) __alloca (grbuflen);
- __getgrnam_r (TTY_GROUP, &grbuf, grtmpbuf, grbuflen, &p);
- if (p != NULL)
- tty_gid = p->gr_gid;
- }
- gid_t gid = tty_gid == -1 ? __getgid () : tty_gid;
-
-#if HAVE_PT_CHOWN
- /* Make sure the group of the device is that special group. */
- if (st.st_gid != gid)
- {
- if (__chown (buf, uid, gid) < 0)
- goto helper;
- }
-
- /* Make sure the permission mode is set to readable and writable by
- the owner, and writable by the group. */
- mode_t mode = S_IRUSR|S_IWUSR|S_IWGRP;
-#else
- /* When built without pt_chown, we have delegated the creation of the
- pty node with the right group and permission mode to the kernel, and
- non-root users are unlikely to be able to change it. Therefore let's
- consider that POSIX enforcement is the responsibility of the whole
- system and not only the GNU libc. Thus accept different group or
- permission mode. */
-
- /* Make sure the permission is set to readable and writable by the
- owner. For security reasons, make it writable by the group only
- when originally writable and when the group of the device is that
- special group. */
- mode_t mode = S_IRUSR|S_IWUSR|
- ((st.st_gid == gid) ? (st.st_mode & S_IWGRP) : 0);
-#endif
-
- if ((st.st_mode & ACCESSPERMS) != mode)
- {
- if (__chmod (buf, mode) < 0)
- goto helper;
- }
-
- retval = 0;
- goto cleanup;
-
- /* We have to use the helper program if it is available. */
- helper:;
-
-#if HAVE_PT_CHOWN
- pid_t pid = __fork ();
- if (pid == -1)
- goto cleanup;
- else if (pid == 0)
- {
- /* Disable core dumps. */
- struct rlimit rl = { 0, 0 };
- __setrlimit (RLIMIT_CORE, &rl);
-
- /* We pass the master pseudo terminal as file descriptor PTY_FILENO. */
- if (fd != PTY_FILENO)
- if (__dup2 (fd, PTY_FILENO) < 0)
- _exit (FAIL_EBADF);
-
-# ifdef CLOSE_ALL_FDS
- CLOSE_ALL_FDS ();
-# endif
-
- execle (_PATH_PT_CHOWN, __basename (_PATH_PT_CHOWN), NULL, NULL);
- _exit (FAIL_EXEC);
- }
- else
- {
- int w;
-
- if (__waitpid (pid, &w, 0) == -1)
- goto cleanup;
- if (!WIFEXITED (w))
- __set_errno (ENOEXEC);
- else
- switch (WEXITSTATUS (w))
- {
- case 0:
- retval = 0;
- break;
- case FAIL_EBADF:
- __set_errno (EBADF);
- break;
- case FAIL_EINVAL:
- __set_errno (EINVAL);
- break;
- case FAIL_EACCES:
- __set_errno (EACCES);
- break;
- case FAIL_EXEC:
- __set_errno (ENOEXEC);
- break;
- case FAIL_ENOMEM:
- __set_errno (ENOMEM);
- break;
-
- default:
- assert(! "grantpt: internal error: invalid exit code from pt_chown");
- }
- }
-#endif
-
- cleanup:
- if (buf != _buf)
- free (buf);
-
- return retval;
-}
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