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nis_defaults.c

/* Copyright (c) 1997, 1998 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 Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <rpc/rpc.h>
#include <rpcsvc/nis.h>

#define DEFAULT_TTL 43200

/*
** Some functions for parsing the -D param and NIS_DEFAULTS Environ
*/
static nis_name
searchgroup (char *str)
{
  char *cptr;
  int i;

  cptr = strstr (str, "group=");
  if (cptr == NULL)
    return NULL;

  cptr += 6;                  /* points to the begin of the group string */
  i = 0;
  while (cptr[i] != '\0' && cptr[i] != ':')
    i++;
  if (i == 0)                 /* only "group=" ? */
    return (nis_name) "";

  return strndup (cptr, i);
}

static nis_name
searchowner (char *str)
{
  char *cptr;
  int i;

  cptr = strstr (str, "owner=");
  if (cptr == NULL)
    return NULL;

  cptr += 6;                  /* points to the begin of the owner string */
  i = 0;
  while (cptr[i] != '\0' && cptr[i] != ':')
    i++;
  if (i == 0)                 /* only "owner=" ? */
    return strdup ("");

  return strndup (cptr, i);
}

static uint32_t
searchttl (char *str)
{
  char buf[strlen (str) + 1];
  char *cptr, *dptr;
  uint32_t time;
  int i;

  dptr = strstr (str, "ttl=");
  if (dptr == NULL)           /* should (could) not happen */
    return DEFAULT_TTL;;

  dptr += 4;                  /* points to the begin of the new ttl */
  i = 0;
  while (dptr[i] != '\0' && dptr[i] != ':')
    i++;
  if (i == 0)                 /* only "ttl=" ? */
    return DEFAULT_TTL;

  strncpy (buf, dptr, i);
  buf[i] = '\0';
  time = 0;

  dptr = buf;
  cptr = strchr (dptr, 'd');
  if (cptr != NULL)
    {
      *cptr = '\0';
      cptr++;
      time += atoi (dptr) * 60 * 60 * 24;
      dptr = cptr;
    }

  cptr = strchr (dptr, 'h');
  if (cptr != NULL)
    {
      *cptr = '\0';
      cptr++;
      time += atoi (dptr) * 60 * 60;
      dptr = cptr;
    }

  cptr = strchr (dptr, 'm');
  if (cptr != NULL)
    {
      *cptr = '\0';
      cptr++;
      time += atoi (dptr) * 60;
      dptr = cptr;
    }

  cptr = strchr (dptr, 's');
  if (cptr != NULL)
    *cptr = '\0';

  time += atoi (dptr);

  return time;
}

static unsigned int
searchaccess (char *str, unsigned int access)
{
  char buf[strlen (str) + 1];
  char *cptr;
  unsigned int result = access;
  int i;
  int n, o, g, w;

  cptr = strstr (str, "access=");
  if (cptr == NULL)
    return 0;

  cptr += 7;                  /* points to the begin of the access string */
  i = 0;
  while (cptr[i] != '\0' && cptr[i] != ':')
    i++;
  if (i == 0)                 /* only "access=" ? */
    return 0;

  strncpy (buf, cptr, i);
  buf[i] = '\0';

  n = o = g = w = 0;
  cptr = buf;
  if (*cptr == ',') /* Fix for stupid Solaris scripts */
    ++cptr;
  while (*cptr != '\0')
    {
      switch (*cptr)
      {
      case 'n':
        n = 1;
        break;
      case 'o':
        o = 1;
        break;
      case 'g':
        g = 1;
        break;
      case 'w':
        w = 1;
        break;
      case 'a':
        o = g = w = 1;
        break;
      case '-':
        cptr++;         /* Remove "-" from beginning */
        while (*cptr != '\0' && *cptr != ',')
          {
            switch (*cptr)
            {
            case 'r':
              if (n)
                result = result & ~(NIS_READ_ACC << 24);
              if (o)
                result = result & ~(NIS_READ_ACC << 16);
              if (g)
                result = result & ~(NIS_READ_ACC << 8);
              if (w)
                result = result & ~(NIS_READ_ACC);
              break;
            case 'm':
              if (n)
                result = result & ~(NIS_MODIFY_ACC << 24);
              if (o)
                result = result & ~(NIS_MODIFY_ACC << 16);
              if (g)
                result = result & ~(NIS_MODIFY_ACC << 8);
              if (w)
                result = result & ~(NIS_MODIFY_ACC);
              break;
            case 'c':
              if (n)
                result = result & ~(NIS_CREATE_ACC << 24);
              if (o)
                result = result & ~(NIS_CREATE_ACC << 16);
              if (g)
                result = result & ~(NIS_CREATE_ACC << 8);
              if (w)
                result = result & ~(NIS_CREATE_ACC);
              break;
            case 'd':
              if (n)
                result = result & ~(NIS_DESTROY_ACC << 24);
              if (o)
                result = result & ~(NIS_DESTROY_ACC << 16);
              if (g)
                result = result & ~(NIS_DESTROY_ACC << 8);
              if (w)
                result = result & ~(NIS_DESTROY_ACC);
              break;
            default:
              return (~0U);
            }
            cptr++;
          }
        n = o = g = w = 0;
        break;
      case '+':
        cptr++;         /* Remove "+" from beginning */
        while (*cptr != '\0' && *cptr != ',')
          {
            switch (*cptr)
            {
            case 'r':
              if (n)
                result = result | (NIS_READ_ACC << 24);
              if (o)
                result = result | (NIS_READ_ACC << 16);
              if (g)
                result = result | (NIS_READ_ACC << 8);
              if (w)
                result = result | (NIS_READ_ACC);
              break;
            case 'm':
              if (n)
                result = result | (NIS_MODIFY_ACC << 24);
              if (o)
                result = result | (NIS_MODIFY_ACC << 16);
              if (g)
                result = result | (NIS_MODIFY_ACC << 8);
              if (w)
                result = result | (NIS_MODIFY_ACC);
              break;
            case 'c':
              if (n)
                result = result | (NIS_CREATE_ACC << 24);
              if (o)
                result = result | (NIS_CREATE_ACC << 16);
              if (g)
                result = result | (NIS_CREATE_ACC << 8);
              if (w)
                result = result | (NIS_CREATE_ACC);
              break;
            case 'd':
              if (n)
                result = result | (NIS_DESTROY_ACC << 24);
              if (o)
                result = result | (NIS_DESTROY_ACC << 16);
              if (g)
                result = result | (NIS_DESTROY_ACC << 8);
              if (w)
                result = result | (NIS_DESTROY_ACC);
              break;
            default:
              return (~0U);
            }
            cptr++;
          }
        n = o = g = w = 0;
        break;
      case '=':
        cptr++;         /* Remove "=" from beginning */
        /* Clear */
        if (n)
          result = result & ~((NIS_READ_ACC + NIS_MODIFY_ACC +
                         NIS_CREATE_ACC + NIS_DESTROY_ACC) << 24);

        if (o)
          result = result & ~((NIS_READ_ACC + NIS_MODIFY_ACC +
                         NIS_CREATE_ACC + NIS_DESTROY_ACC) << 16);
        if (g)
          result = result & ~((NIS_READ_ACC + NIS_MODIFY_ACC +
                         NIS_CREATE_ACC + NIS_DESTROY_ACC) << 8);
        if (w)
          result = result & ~(NIS_READ_ACC + NIS_MODIFY_ACC +
                        NIS_CREATE_ACC + NIS_DESTROY_ACC);
        while (*cptr != '\0' && *cptr != ',')
          {
            switch (*cptr)
            {
            case 'r':
              if (n)
                result = result | (NIS_READ_ACC << 24);
              if (o)
                result = result | (NIS_READ_ACC << 16);
              if (g)
                result = result | (NIS_READ_ACC << 8);
              if (w)
                result = result | (NIS_READ_ACC);
              break;
            case 'm':
              if (n)
                result = result | (NIS_MODIFY_ACC << 24);
              if (o)
                result = result | (NIS_MODIFY_ACC << 16);
              if (g)
                result = result | (NIS_MODIFY_ACC << 8);
              if (w)
                result = result | (NIS_MODIFY_ACC);
              break;
            case 'c':
              if (n)
                result = result | (NIS_CREATE_ACC << 24);
              if (o)
                result = result | (NIS_CREATE_ACC << 16);
              if (g)
                result = result | (NIS_CREATE_ACC << 8);
              if (w)
                result = result | (NIS_CREATE_ACC);
              break;
            case 'd':
              if (n)
                result = result | (NIS_DESTROY_ACC << 24);
              if (o)
                result = result | (NIS_DESTROY_ACC << 16);
              if (g)
                result = result | (NIS_DESTROY_ACC << 8);
              if (w)
                result = result | (NIS_DESTROY_ACC);
              break;
            default:
              return result = (~0U);
            }
            cptr++;
          }
        n = o = g = w = 0;
        break;
      default:
        return result = (~0U);
      }
      if (*cptr != '\0')
      cptr++;
    }

  return result;
}

nis_name
__nis_default_owner (char *defaults)
{
  char default_owner[NIS_MAXNAMELEN + 1];
  char *cptr, *dptr;

  strcpy (default_owner, nis_local_principal ());

  if (defaults != NULL)
    {
      dptr = strstr (defaults, "owner=");
      if (dptr != NULL)
      {
        char *p = searchowner (defaults);
        if (strlen (p) <= NIS_MAXNAMELEN)
          strcpy (default_owner, p);
        free (p);
      }
    }
  else
    {
      cptr = getenv ("NIS_DEFAULTS");
      if (cptr != NULL)
      {
        dptr = strstr (cptr, "owner=");
        if (dptr != NULL)
          {
            char *p = searchowner (cptr);
            if (strlen (p) <= NIS_MAXNAMELEN)
            strcpy (default_owner, p);
            free (p);
          }
      }
    }

  return strdup (default_owner);
}

nis_name
__nis_default_group (char *defaults)
{
  char default_group[NIS_MAXNAMELEN + 1];
  char *cptr, *dptr;

  strcpy (default_group, nis_local_group ());

  if (defaults != NULL)
    {
      dptr = strstr (defaults, "group=");
      if (dptr != NULL)
      {
        char *p = searchgroup (defaults);

        if (strlen (p) <= NIS_MAXNAMELEN)
          strcpy (default_group, p);
        free (p);
      }
    }
  else
    {
      cptr = getenv ("NIS_DEFAULTS");
      if (cptr != NULL)
      {
        dptr = strstr (cptr, "group=");
        if (dptr != NULL)
          {
            char *p = searchgroup (cptr);

            if (strlen (p) <= NIS_MAXNAMELEN)
            strcpy (default_group, p);
            free (p);
          }
      }
    }

  return strdup (default_group);
}

uint32_t
__nis_default_ttl (char *defaults)
{
  char *cptr, *dptr;

  if (defaults != NULL)
    {
      dptr = strstr (defaults, "ttl=");
      if (dptr != NULL)
      return searchttl (defaults);
    }

  cptr = getenv ("NIS_DEFAULTS");
  if (cptr == NULL)
    return DEFAULT_TTL;

  dptr = strstr (cptr, "ttl=");
  if (dptr == NULL)
    return DEFAULT_TTL;

  return searchttl (cptr);
}

/* Default access rights are ----rmcdr---r---, but we could change
   this with the NIS_DEFAULTS variable. */
unsigned int
__nis_default_access (char *param, unsigned int defaults)
{
  unsigned int result;
  char *cptr;

  if (defaults == 0)
    result = 0 | OWNER_DEFAULT | GROUP_DEFAULT | WORLD_DEFAULT;
  else
    result = defaults;

  if (param != NULL && strstr (param, "access=") != NULL)
    result = searchaccess (param, result);
  else
    {
      cptr = getenv ("NIS_DEFAULTS");
      if (cptr != NULL && strstr (cptr, "access=") != NULL)
      result = searchaccess (getenv ("NIS_DEFAULTS"), result);
    }

  return result;
}

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