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-rw-r--r--login/programs/pt_chown.c153
-rw-r--r--login/pty-private.h (renamed from login/pty-internal.h)23
2 files changed, 121 insertions, 55 deletions
diff --git a/login/programs/pt_chown.c b/login/programs/pt_chown.c
index dbf79fc..6ed8e82 100644
--- a/login/programs/pt_chown.c
+++ b/login/programs/pt_chown.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1998 Free Software Foundation, Inc.
+/* pt_chmod - helper program for `grantpt'.
+ Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by C. Scott Ananian <cananian@alumni.princeton.edu>, 1998.
@@ -17,72 +18,136 @@
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
-/* pt_chmod.c ... securely implement grantpt in user-land. */
-
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <stdlib.h>
-#include <unistd.h>
+#include <argp.h>
#include <errno.h>
-#include <stdio.h>
+#include <error.h>
#include <grp.h>
+#include <libintl.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "pty-private.h"
-#include "pty-internal.h"
-#define Str(x) _Str(x)
-#define _Str(x) #x
+/* Get libc version number. */
+#include "../version.h"
-void
-usage (void)
+#define PACKAGE _libc_intl_domainname
+
+/* Name and version of program. */
+static void print_version (FILE *stream, struct argp_state *state);
+void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;
+
+/* Function to print some extra text in the help message. */
+static char *more_help (int key, const char *text, void *input);
+
+/* Data structure to communicate with argp functions. */
+static struct argp argp =
{
- fprintf (stderr, _("usage: pt_chown FD>&%s\n"
- "This program is used internally by grantpt(3).\n"),
- Str (PTY_FD));
- exit (0);
+ NULL, NULL, NULL, NULL, NULL, more_help
+};
+
+
+/* Print the version information. */
+static void
+print_version (FILE *stream, struct argp_state *state)
+{
+ fprintf (stream, "pt_chmod (GNU %s) %s\n", PACKAGE, VERSION);
+ fprintf (stream, gettext ("\
+Copyright (C) %s Free Software Foundation, Inc.\n\
+This is free software; see the source for copying conditions. There is NO\n\
+warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
+"), "1998");
}
-void
-bad_installation (void)
+static char *
+more_help (int key, const char *text, void *input)
{
- fputs (_("pt_chown: installation problem: "
- "This program needs to be setuid root.\n"), stderr);
- exit (FAIL_EXEC);
+ char *cp;
+
+ switch (key)
+ {
+ case ARGP_KEY_HELP_PRE_DOC:
+ asprintf (&cp, gettext ("\
+Set the owner, group and access permission of the terminal passed on\
+ file descriptor `%d'. This is the helper program for the `grantpt'\
+ function. It is not intended to be run directly from the command\
+ line.\n"),
+ PTY_FILENO);
+ return cp;
+ case ARGP_KEY_HELP_EXTRA:
+ /* We print some extra information. */
+ asprintf (&cp, gettext ("\
+The owner is set to the current user, the group is set to `%s',\
+ and the access permission is set to `%o'.\n\n\
+%s"),
+ TTY_GROUP, S_IRUSR|S_IWUSR|S_IWGRP, gettext ("\
+Report bugs using the `glibcbug' script to <bugs@gnu.org>.\n"));
+ return cp;
+ default:
+ break;
+ }
+ return (char *) text;
}
int
-main (int argc, char **argv)
+main (int argc, char *argv[])
{
- struct group *grp;
- struct stat s;
char *pty;
+ int remaining;
+ struct stat st;
+ struct group *p;
gid_t gid;
- uid_t uid;
- if (argc != 1)
- usage ();
+ /* Set locale via LC_ALL. */
+ setlocale (LC_ALL, "");
+
+ /* Set the text message domain. */
+ textdomain (PACKAGE);
+
+ /* parse and process arguments. */
+ argp_parse (&argp, argc, argv, 0, &remaining, NULL);
+
+ if (remaining < argc)
+ {
+ /* We should not be called with any non-option parameters. */
+ error (0, 0, gettext ("too many arguments"));
+ argp_help (&argp, stdout, ARGP_HELP_SEE | ARGP_HELP_EXIT_ERR,
+ program_invocation_short_name);
+ exit (EXIT_FAILURE);
+ }
+
+ /* Check if we are properly installed. */
if (geteuid () != 0)
- bad_installation ();
-
- grp = getgrnam (TTY_GROUP);
- gid = grp ? grp->gr_gid : getgid ();
- uid = getuid ();
+ error (FAIL_EXEC, 0, gettext ("needs to be installed setuid `root'"));
- /* Check that fd is a valid pty master -- call ptsname(). */
- pty = ptsname (PTY_FD);
+ /* Check that PTY_FILENO is a valid master pseudo terminal. */
+ pty = ptsname (PTY_FILENO);
if (pty == NULL)
return errno == EBADF ? FAIL_EBADF : FAIL_EINVAL;
- close (PTY_FD);
+ close (PTY_FILENO);
- /* Check that target file is a character device. */
- if (stat (pty, &s))
- return FAIL_EINVAL; /* This should only fail if pty doesn't exist. */
- if (!S_ISCHR (s.st_mode))
+ /* Check that the returned slave pseudo terminal is a
+ character device. */
+ if (stat (pty, &st) < 0 || !S_ISCHR(st.st_mode))
return FAIL_EINVAL;
- if (chmod (pty, 0620))
- return FAIL_EACCES; /* XXX: Probably not true. */
+ /* Get the group ID of the special `tty' group. */
+ p = getgrnam (TTY_GROUP);
+ gid = p ? p->gr_gid : getgid ();
+
+ /* Set the owner to the real user ID, and the group to that special
+ group ID. */
+ if (chown (pty, getuid (), gid) < 0)
+ return FAIL_EACCES;
- if (chown (pty, uid, gid))
+ /* Set the permission mode to readable and writable by the owner,
+ and writable by the group. */
+ if (chmod (pty, S_IRUSR|S_IWUSR|S_IWGRP) < 0)
return FAIL_EACCES;
- return 0;
+ exit (EXIT_SUCCESS);
}
diff --git a/login/pty-internal.h b/login/pty-private.h
index c185886..b20fd0e 100644
--- a/login/pty-internal.h
+++ b/login/pty-private.h
@@ -1,4 +1,5 @@
-/* Copyright (C) 1998 Free Software Foundation, Inc.
+/* Internal defenitions and declarations for pseudo terminal functions.
+ 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.
@@ -17,19 +18,19 @@
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
-/* Internal constants used by the pseudoterminal handling code. */
+#ifndef _PTY_PRIVATE_H
+#define _PTY_PRIVATE_H 1
-#ifndef _PTY_INTERNAL_H
-#define _PTY_INTERNAL_H 1
+/* The group slave pseudo terminals belong to. */
+#define TTY_GROUP "tty"
-/* Length of a buffer to hold a pty name. */
-#define PTYNAMELEN 15 /* "/dev/pts/65535$" */
+/* The file descriptor connected to the master pseudo terminal. */
+#define PTY_FILENO 3
-/* Which group should pty slaves belong to: */
-#define TTY_GROUP "tty"
+/* Path to the helper program that implements `grantpt' in user space. */
+#define _PATH_PT_CHOWN LIBEXECDIR "/pt_chown"
-/* Communication between grantpt and pt_chown. */
-#define PTY_FD 3
+/* Exit codes for the helper program. */
enum /* failure modes */
{
FAIL_EBADF = 1,
@@ -38,4 +39,4 @@ enum /* failure modes */
FAIL_EXEC
};
-#endif
+#endif /* pty-private.h */