glibc/nis/nis_local_names.c

/* Copyright (c) 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.

   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 <errno.h>
#include <string.h>
#include <unistd.h>
#include <rpcsvc/nis.h>
#include <rpcsvc/nislib.h>

nis_name
nis_local_group (void)
{
  static char __nisgroup[NIS_MAXNAMELEN + 1];

  if (__nisgroup[0] == '\0')
    {
      char *cptr;

      if ((cptr = getenv ("NIS_GROUP")) == NULL)
	return __nisgroup;

      if (strlen (cptr) >= NIS_MAXNAMELEN)
	return __nisgroup;

      strcpy (__nisgroup, cptr);

      if (__nisgroup[strlen (__nisgroup) - 1] != '.')
	{
	  cptr = nis_local_directory ();
	  if (strlen (__nisgroup) + strlen (cptr) + 1 < NIS_MAXNAMELEN)
	    {
	      strcat (__nisgroup, ".");
	      strcat (__nisgroup, cptr);
	    }
	  else
	    {
	      __nisgroup[0] = '\0';
	      return __nisgroup;
	    }
	}
    }

  return __nisgroup;
}


nis_name
nis_local_directory (void)
{
  static char __nisdomainname[NIS_MAXNAMELEN + 1];
  int len;

  if (__nisdomainname[0] == '\0')
    {
      if (getdomainname (__nisdomainname, NIS_MAXNAMELEN) < 0)
	strcpy (__nisdomainname, "\0");
      else
	{
	  len = strlen (__nisdomainname);

	  /* Missing trailing dot? */
	  if (__nisdomainname[len - 1] != '.')
	    {
	      __nisdomainname[len] = '.';
	      __nisdomainname[len + 1] = '\0';
	    }
	}
    }

  return __nisdomainname;
}

nis_name
nis_local_principal (void)
{
  static char __principal[NIS_MAXNAMELEN + 1];

  if (__principal[0] == '\0')
    {
      char buf[NIS_MAXNAMELEN + 1];
      nis_result *res;
      uid_t uid = geteuid ();

      if (uid != 0)
	{
	  snprintf (buf, NIS_MAXNAMELEN - 1,
		    "[auth_name=%d,auth_type=LOCAL],cred.org_dir.%s",
		    uid, nis_local_directory ());

	  if (buf[strlen (buf) - 1] != '.')
	    strcat (buf, ".");

	  res = nis_list (buf, USE_DGRAM + NO_AUTHINFO + FOLLOW_LINKS +
			  FOLLOW_PATH, NULL, NULL);

	  if (res == NULL)
	    {
	      strcpy (__principal, "nobody");
	      return __principal;
	    }

	  if (res->status == NIS_SUCCESS)
	    {
	      if (res->objects.objects_len > 1)
		{
		  /* More than one principal with same uid?  something
		     wrong with cred table. Should be unique Warn user
		     and continue.  */
		  printf (_("\
LOCAL entry for UID %d in directory %s not unique\n"),
			  uid, nis_local_directory ());
		}
	      strcpy (__principal, ENTRY_VAL (res->objects.objects_val, 0));
	      nis_freeresult (res);
	      return __principal;
	    }
	  else
	    {
	      nis_freeresult (res);
	      strcpy (__principal, "nobody");
	      return __principal;
	    }
	}
      else
	{
	  strcpy (__principal, nis_local_host ());
	  return __principal;
	}

      /* Should be never reached */
      strcpy (__principal, "nobody");
      return __principal;
    }
  return __principal;
}

nis_name
nis_local_host (void)
{
  static char __nishostname[NIS_MAXNAMELEN + 1];
  int len;

  if (__nishostname[0] == '\0')
    {
      if (gethostname (__nishostname, NIS_MAXNAMELEN) < 0)
	__nishostname[0] = '\0';
      else
	{
	  char *cp;
	  len = strlen(__nishostname);

	  /* Hostname already fully qualified? */
	  if (__nishostname[len - 1] == '.')
	    return __nishostname;

	  if ((strlen (__nishostname) + strlen (nis_local_directory ()) + 1) >
	      NIS_MAXNAMELEN)
	    {
	      __nishostname[0] = '\0';
	      return __nishostname;
	    }

	  cp = &__nishostname[len];
	  *cp++ = '.';
	  strncpy (cp, nis_local_directory (), NIS_MAXNAMELEN - len -1);
	  __nishostname[NIS_MAXNAMELEN] = '\0';
	}
    }

  return __nishostname;
}