glibc/sysdeps/unix/grantpt.c
Ulrich Drepper 00bc5db059 Update.
1998-09-18 17:41  Ulrich Drepper  <drepper@cygnus.com>

	* libio/fileops.c (_IO_new_file_underflow): Before allocating
	buffer make sure the pushback buffer is destroyed.
	(_IO_new_file_seekoff): Likewise.
	If mode==0 quit early with the result.
	Clear OEF flag after successful fseek.
	* libio/libio.h (_IO_FILE_complete): Add _IO_save_ptr.
	* libio/ftello.c (ftello): Add offset from original buffer if
	stream has pushed back characters.
	* libio/ftello64.c (ftello64): Likewise.
	* libio/iofgetpos.c (_IO_fgetpos): Likewise.
	* libio/iofgetpos64.c (_IO_fgetpos64): Likewise.
	* libio/ioftell.c (_IO_ftell): Likewise.
	* libio/genops.c (_IO_switch_to_main_get_area): Swap _IO_read_ptr
	and _IO_save_ptr.
	(_IO_switch_to_backup_area): Save _IO_read_ptr in _IO_save_ptr.
	(_IO_default_pbackfail): Only stored push back character in original
	buffer if it is the same as the one in the file at this position.
	* libio/iofclose.c: Free backup buffer if one is available.
	* libio/ioseekoff.c (_IO_seekoff): Only remove pushback buffer if
	mode!=0.

	* strdlib/strtol.c (strtol): Handle 0x... string for base!=0 correctly.

	* time/strftime.c [_LIBC] (ampm): Use tp->tm_hour not hour12.

1998-09-18  Mark Kettenis  <kettenis@phys.uva.nl>

	* login/programs/pt_chown.c (more_help): Correct message that
	describes the purpose of the program.

	* login/openpty.c: Do not include pty-private.h.
	(pts_name): New function.  Return name of slave pseudo terminal in
	an allocated buffer if necessary.
	(openpty): Use pts_name to get name of the slave end of the pseudo
	terminal pair.

	* sysdeps/unix/grantpt.c (grantpt): Free buffer allocated by
	pts_name before return.

1998-09-18 11:15  Ulrich Drepper  <drepper@cygnus.com>

	* math/math.h: Define __NO_MATH_INLINES if __STRICT_ANSI__.
1998-09-18 17:59:03 +00:00

208 lines
5.0 KiB
C

/* Copyright (C) 1998 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <assert.h>
#include <errno.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)
{
int rv;
char *buf = *pts;
for (;;)
{
char *new_buf;
if (buf_len)
{
rv = ptsname_r (fd, buf, buf_len);
if (rv != 0 || memchr (buf, '\0', buf_len))
/* We either got an error, or 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 = realloc (buf, buf_len);
else
new_buf = 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 stat st;
char *grtmpbuf;
struct group grbuf;
size_t grbuflen = __sysconf (_SC_GETGR_R_SIZE_MAX);
struct group *p;
uid_t uid;
gid_t gid;
pid_t pid;
if (pts_name (fd, &buf, sizeof (_buf)))
return -1;
if (__stat (buf, &st) < 0)
goto cleanup;
/* Make sure that we own the device. */
uid = __getuid ();
if (st.st_uid != uid)
{
if (__chown (buf, uid, st.st_gid) < 0)
goto helper;
}
/* Get the group ID of the special `tty' group. */
if (grbuflen == -1)
/* `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);
gid = p ? p->gr_gid : __getgid ();
/* 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. */
if ((st.st_mode & ACCESSPERMS) != (S_IRUSR|S_IWUSR|S_IWGRP))
{
if (__chmod (buf, S_IRUSR|S_IWUSR|S_IWGRP) < 0)
goto helper;
}
retval = 0;
goto cleanup;
/* We have to use the helper program. */
helper:
pid = __fork ();
if (pid == -1)
goto cleanup;
else if (pid == 0)
{
/* Disable core dumps. */
struct rlimit rl = { 0, 0 };
setrlimit (RLIMIT_CORE, &rl);
/* We pase the master pseudo terminal as file descriptor PTY_FILENO. */
if (fd != PTY_FILENO)
if (__dup2 (fd, PTY_FILENO) < 0)
_exit (FAIL_EBADF);
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;
default:
assert(! "getpt: internal error: invalid exit code from pt_chown");
}
}
cleanup:
if (buf != _buf)
free (buf);
return retval;
}