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glibc  2.9
Defines | Functions | Variables
pt_chown.c File Reference
#include <argp.h>
#include <errno.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 "../version.h"

Go to the source code of this file.


#define PACKAGE   _libc_intl_domainname


static void print_version (FILE *stream, struct argp_state *state)
static char * more_help (int key, const char *text, void *input)
static int do_pt_chown (void)
int main (int argc, char *argv[])


void(* argp_program_version_hook )(FILE *, struct argp_state *) = print_version
static struct argp

Define Documentation

Definition at line 38 of file pt_chown.c.

Function Documentation

static int do_pt_chown ( void  ) [static]

Definition at line 99 of file pt_chown.c.

  char *pty;
  struct stat st;
  struct group *p;
  gid_t gid;

  /* Check that PTY_FILENO is a valid master pseudo terminal.  */
  pty = ptsname (PTY_FILENO);
  if (pty == NULL)
    return errno == EBADF ? FAIL_EBADF : FAIL_EINVAL;

  /* Check that the returned slave pseudo terminal is a
     character device.  */
  if (stat (pty, &st) < 0 || !S_ISCHR(st.st_mode))
    return FAIL_EINVAL;

  /* 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;

  /* 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;

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int main ( int  argc,
char *  argv[] 

Definition at line 135 of file pt_chown.c.

  uid_t euid = geteuid ();
  int remaining;

  /* Normal invocation of this program is with no arguments and
     with privileges.
     FIXME: Should use capable (CAP_CHOWN|CAP_FOWNER).  */
  if (argc == 1 && euid == 0)
    return do_pt_chown ();

  /* We aren't going to be using privileges, so drop them right now. */
  setuid (getuid ());

  /* 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,
      return EXIT_FAILURE;

  /* Check if we are properly installed.  */
  if (euid != 0)
    error (FAIL_EXEC, 0, gettext ("needs to be installed setuid `root'"));

  return EXIT_SUCCESS;

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static char * more_help ( int  key,
const char *  text,
void *  input 
) [static]

Definition at line 67 of file pt_chown.c.

  char *cp;

  switch (key)
      asprintf (&cp, gettext ("\
Set the owner, group and access permission of the slave pseudo\
 terminal corresponding to the master pseudo 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"),
      return cp;
      /* 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\
              TTY_GROUP, S_IRUSR|S_IWUSR|S_IWGRP, gettext ("\
For bug reporting instructions, please see:\n\
      return cp;
  return (char *) text;

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static void print_version ( FILE stream,
struct argp_state state 
) [static]

Definition at line 56 of file pt_chown.c.

  fprintf (stream, "pt_chown (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\
"), "1999");

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Variable Documentation

struct argp [static]
Initial value:

Definition at line 48 of file pt_chown.c.

Definition at line 42 of file pt_chown.c.