glibc/nis/nss_nisplus/nisplus-parser.c

/* Copyright (C) 1997, 1999, 2004 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 <pwd.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <rpcsvc/nis.h>

#include "nisplus-parser.h"

#define NISENTRYVAL(idx,col,res) \
        ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)

#define NISENTRYLEN(idx,col,res) \
        ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)


int
_nss_nisplus_parse_pwent (nis_result *result, struct passwd *pw,
			  char *buffer, size_t buflen, int *errnop)
{
  char *first_unused = buffer;
  size_t room_left = buflen;
  size_t len;

  if (result == NULL)
    return 0;

  if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
      || result->objects.objects_len != 1
      || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
      || strcmp (result->objects.objects_val->EN_data.en_type,
		 "passwd_tbl") != 0
      || result->objects.objects_val->EN_data.en_cols.en_cols_len < 7)
    return 0;

  if (NISENTRYLEN (0, 0, result) >= room_left)
    {
      /* The line is too long for our buffer.  */
    no_more_room:
      *errnop = ERANGE;
      return -1;
    }

  strncpy (first_unused, NISENTRYVAL (0, 0, result),
	   NISENTRYLEN (0, 0, result));
  first_unused[NISENTRYLEN (0, 0, result)] = '\0';
  len = strlen (first_unused);
  if (len == 0) /* No name ? Should never happen, database is corrupt */
    return 0;
  pw->pw_name = first_unused;
  room_left -= (len + 1);
  first_unused += (len + 1);

  if (NISENTRYLEN (0, 1, result) >= room_left)
    goto no_more_room;

  strncpy (first_unused, NISENTRYVAL (0, 1, result),
	   NISENTRYLEN (0, 1, result));
  first_unused[NISENTRYLEN (0, 1, result)] = '\0';
  pw->pw_passwd = first_unused;
  len = strlen (first_unused);
  room_left -= (len + 1);
  first_unused += (len + 1);

  if (NISENTRYLEN(0, 2, result) >= room_left)
    goto no_more_room;

  strncpy (first_unused, NISENTRYVAL (0, 2, result),
	   NISENTRYLEN (0, 2, result));
  first_unused[NISENTRYLEN (0, 2, result)] = '\0';
  len = strlen (first_unused);
  if (len == 0) /* If we don't have a uid, it's an invalid shadow entry */
    return 0;
  pw->pw_uid = strtoul (first_unused, NULL, 10);
  room_left -= (len + 1);
  first_unused += (len + 1);

  if (NISENTRYLEN (0, 3, result) >= room_left)
    goto no_more_room;

  strncpy (first_unused, NISENTRYVAL (0, 3, result),
	   NISENTRYLEN (0, 3, result));
  first_unused[NISENTRYLEN (0, 3, result)] = '\0';
  len = strlen (first_unused);
  if (len == 0) /* If we don't have a gid, it's an invalid shadow entry */
    return 0;
  pw->pw_gid = strtoul (first_unused, NULL, 10);
  room_left -= (len + 1);
  first_unused += (len + 1);

  if (NISENTRYLEN(0, 4, result) >= room_left)
    goto no_more_room;

  strncpy (first_unused, NISENTRYVAL (0, 4, result),
	   NISENTRYLEN (0, 4, result));
  first_unused[NISENTRYLEN (0, 4, result)] = '\0';
  pw->pw_gecos = first_unused;
  len = strlen (first_unused);
  room_left -= (len + 1);
  first_unused += (len + 1);

  if (NISENTRYLEN (0, 5, result) >= room_left)
    goto no_more_room;

  strncpy (first_unused, NISENTRYVAL (0, 5, result),
	   NISENTRYLEN (0, 5, result));
  first_unused[NISENTRYLEN (0, 5, result)] = '\0';
  pw->pw_dir = first_unused;
  len = strlen (first_unused);
  room_left -= (len + 1);
  first_unused += (len + 1);

  if (NISENTRYLEN (0, 6, result) >= room_left)
    goto no_more_room;

  strncpy (first_unused, NISENTRYVAL (0, 6, result),
	   NISENTRYLEN (0, 6, result));
  first_unused[NISENTRYLEN (0, 6, result)] = '\0';
  pw->pw_shell = first_unused;
  len = strlen (first_unused);
  room_left -= (len + 1);
  first_unused += (len + 1);

  return 1;
}
libnss_nisplus_hidden_def (_nss_nisplus_parse_pwent)

int
_nss_nisplus_parse_grent (nis_result *result, u_long entry, struct group *gr,
			  char *buffer, size_t buflen, int *errnop)
{
  char *first_unused = buffer;
  size_t room_left = buflen;
  char *line;
  int count;
  size_t len;

  if (result == NULL)
    return 0;

  if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
      || __type_of(result->objects.objects_val) != NIS_ENTRY_OBJ
      || strcmp (result->objects.objects_val[entry].EN_data.en_type,
		 "group_tbl") != 0
      || result->objects.objects_val[entry].EN_data.en_cols.en_cols_len < 4)
    return 0;

  if (NISENTRYLEN (entry, 0, result) >= room_left)
    {
      /* The line is too long for our buffer.  */
    no_more_room:
      *errnop = ERANGE;
      return -1;
    }

  strncpy (first_unused, NISENTRYVAL (entry, 0, result),
	   NISENTRYLEN (entry, 0, result));
  first_unused[NISENTRYLEN (entry, 0, result)] = '\0';
  len = strlen (first_unused);
  if (len == 0) /* group table is corrupt */
    return 0;
  gr->gr_name = first_unused;
  room_left -= (len + 1);
  first_unused += (len + 1);

  if (NISENTRYLEN (entry, 1, result) >= room_left)
    goto no_more_room;

  strncpy (first_unused, NISENTRYVAL (entry, 1, result),
	   NISENTRYLEN (entry, 1, result));
  first_unused[NISENTRYLEN (entry, 1, result)] = '\0';
  gr->gr_passwd = first_unused;
  len = strlen (first_unused);
  room_left -= (len + 1);
  first_unused += (len + 1);

  if (NISENTRYLEN (entry, 2, result) >= room_left)
    goto no_more_room;

  strncpy (first_unused, NISENTRYVAL (entry, 2, result),
	   NISENTRYLEN (entry, 2, result));
  first_unused[NISENTRYLEN (entry, 2, result)] = '\0';
  len = strlen (first_unused);
  if (len == 0) /* We should always have an gid */
    return 0;
  gr->gr_gid = strtoul (first_unused, NULL, 10);
  room_left -= (strlen (first_unused) + 1);
  first_unused += strlen (first_unused) + 1;

  if (NISENTRYLEN (entry, 3, result) >= room_left)
    goto no_more_room;

  strncpy (first_unused, NISENTRYVAL (entry, 3, result),
	   NISENTRYLEN (entry, 3, result));
  first_unused[NISENTRYLEN (entry, 3, result)] = '\0';
  line = first_unused;
  len = strlen (line);
  room_left -= (len + 1);
  first_unused += (len + 1);
  /* Adjust the pointer so it is aligned for
     storing pointers.  */
  first_unused += __alignof__ (char *) - 1;
  first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
  gr->gr_mem = (char **) first_unused;

  count = 0;
  while (*line != '\0')
    {
      /* Skip leading blanks.  */
      while (isspace (*line))
	++line;

      if (*line == '\0')
	break;

      if (room_left < sizeof (char *))
	goto no_more_room;
      room_left -= sizeof (char *);
      gr->gr_mem[count++] = line;

      while (*line != '\0' && *line != ',' && !isspace (*line))
	++line;

      if (*line == ',' || isspace (*line))
	{
	  int is = isspace (*line);

	  *line = '\0';
	  if (is)
	    while (*line != '\0' && (*line == ',' || isspace (*line)))
	      ++line;
	  else
	    ++line;
	}
    }
  if (room_left < sizeof (char *))
    goto no_more_room;
  room_left -= sizeof (char *);
  gr->gr_mem[count] = NULL;

  return 1;
}
libnss_nisplus_hidden_def (_nss_nisplus_parse_grent)

int
_nss_nisplus_parse_spent (nis_result *result, struct spwd *sp,
			  char *buffer, size_t buflen, int *errnop)
{
  char *first_unused = buffer;
  size_t room_left = buflen;
  size_t len;

  if (result == NULL)
    return 0;

  if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
      || result->objects.objects_len != 1
      || __type_of(result->objects.objects_val) != NIS_ENTRY_OBJ
      || strcmp (result->objects.objects_val->EN_data.en_type,
		 "passwd_tbl") != 0
      || result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 8)
    return 0;

  if (NISENTRYLEN (0, 0, result) >= room_left)
    {
      /* The line is too long for our buffer.  */
    no_more_room:
      *errnop = ERANGE;
      return -1;
    }

  strncpy (first_unused, NISENTRYVAL (0, 0, result),
	   NISENTRYLEN (0, 0, result));
  first_unused[NISENTRYLEN (0, 0, result)] = '\0';
  len = strlen (first_unused);
  if (len == 0)
    return 0;
  sp->sp_namp = first_unused;
  room_left -= (len + 1);
  first_unused += (len + 1);

  if (NISENTRYLEN (0, 1, result) >= room_left)
    goto no_more_room;

  strncpy (first_unused, NISENTRYVAL (0, 1, result),
	   NISENTRYLEN (0, 1, result));
  first_unused[NISENTRYLEN (0, 1, result)] = '\0';
  sp->sp_pwdp = first_unused;
  len = strlen (first_unused);
  room_left -= (len + 1);
  first_unused += (len + 1);

  sp->sp_lstchg = sp->sp_min = sp->sp_max = sp->sp_warn = sp->sp_inact =
    sp->sp_expire = -1;
  sp->sp_flag = ~0ul;

  if (NISENTRYLEN (0, 7, result) > 0)
    {
      char *line, *cp;

      line = NISENTRYVAL (0, 7, result);
      cp = strchr (line, ':');
      if (cp == NULL)
	return 1;
      *cp++ = '\0';
      if (*line)
	sp->sp_lstchg = atol (line);

      line = cp;
      cp = strchr (line, ':');
      if (cp == NULL)
	return 1;
      *cp++ = '\0';
      if (*line)
	sp->sp_min = atol (line);

      line = cp;
      cp = strchr (line, ':');
      if (cp == NULL)
	return 1;
      *cp++ = '\0';
      if (*line)
	sp->sp_max = atol (line);

      line = cp;
      cp = strchr (line, ':');
      if (cp == NULL)
	return 1;
      *cp++ = '\0';
      if (*line)
	sp->sp_warn = atol (line);

      line = cp;
      cp = strchr (line, ':');
      if (cp == NULL)
	return 1;
      *cp++ = '\0';
      if (*line)
	sp->sp_inact = atol (line);

      line = cp;
      cp = strchr (line, ':');
      if (cp == NULL)
	return 1;
      *cp++ = '\0';
      if (*line)
	sp->sp_expire = atol (line);

      line = cp;
      if (line == NULL)
	return 1;
      if (*line)
	sp->sp_flag = atol (line);
    }

  return 1;
}
libnss_nisplus_hidden_def (_nss_nisplus_parse_spent)