1 /* pt_chmod - helper program for `grantpt'.
2 Copyright (C) 1998, 1999 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by C. Scott Ananian <cananian@alumni.princeton.edu>, 1998.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
33 #include "pty-private.h"
35 /* Get libc version number. */
36 #include "../version.h"
38 #define PACKAGE _libc_intl_domainname
40 /* Name and version of program. */
41 static void print_version (FILE *stream
, struct argp_state
*state
);
42 void (*argp_program_version_hook
) (FILE *, struct argp_state
*) = print_version
;
44 /* Function to print some extra text in the help message. */
45 static char *more_help (int key
, const char *text
, void *input
);
47 /* Data structure to communicate with argp functions. */
48 static struct argp argp
=
50 NULL
, NULL
, NULL
, NULL
, NULL
, more_help
54 /* Print the version information. */
56 print_version (FILE *stream
, struct argp_state
*state
)
58 fprintf (stream
, "pt_chmod (GNU %s) %s\n", PACKAGE
, VERSION
);
59 fprintf (stream
, gettext ("\
60 Copyright (C) %s Free Software Foundation, Inc.\n\
61 This is free software; see the source for copying conditions. There is NO\n\
62 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
67 more_help (int key
, const char *text
, void *input
)
73 case ARGP_KEY_HELP_PRE_DOC
:
74 asprintf (&cp
, gettext ("\
75 Set the owner, group and access permission of the slave pseudo\
76 terminal corresponding to the master pseudo terminal passed on\
77 file descriptor `%d'. This is the helper program for the\
78 `grantpt' function. It is not intended to be run directly from\
79 the command line.\n"),
82 case ARGP_KEY_HELP_EXTRA
:
83 /* We print some extra information. */
84 asprintf (&cp
, gettext ("\
85 The owner is set to the current user, the group is set to `%s',\
86 and the access permission is set to `%o'.\n\n\
88 TTY_GROUP
, S_IRUSR
|S_IWUSR
|S_IWGRP
, gettext ("\
89 Report bugs using the `glibcbug' script to <bugs@gnu.org>.\n"));
98 main (int argc
, char *argv
[])
106 /* Set locale via LC_ALL. */
107 setlocale (LC_ALL
, "");
109 /* Set the text message domain. */
110 textdomain (PACKAGE
);
112 /* parse and process arguments. */
113 argp_parse (&argp
, argc
, argv
, 0, &remaining
, NULL
);
115 if (remaining
< argc
)
117 /* We should not be called with any non-option parameters. */
118 error (0, 0, gettext ("too many arguments"));
119 argp_help (&argp
, stdout
, ARGP_HELP_SEE
| ARGP_HELP_EXIT_ERR
,
120 program_invocation_short_name
);
124 /* Check if we are properly installed. */
126 error (FAIL_EXEC
, 0, gettext ("needs to be installed setuid `root'"));
128 /* Check that PTY_FILENO is a valid master pseudo terminal. */
129 pty
= ptsname (PTY_FILENO
);
131 return errno
== EBADF
? FAIL_EBADF
: FAIL_EINVAL
;
134 /* Check that the returned slave pseudo terminal is a
136 if (stat (pty
, &st
) < 0 || !S_ISCHR(st
.st_mode
))
139 /* Get the group ID of the special `tty' group. */
140 p
= getgrnam (TTY_GROUP
);
141 gid
= p
? p
->gr_gid
: getgid ();
143 /* Set the owner to the real user ID, and the group to that special
145 if (chown (pty
, getuid (), gid
) < 0)
148 /* Set the permission mode to readable and writable by the owner,
149 and writable by the group. */
150 if (chmod (pty
, S_IRUSR
|S_IWUSR
|S_IWGRP
) < 0)