437 lines
10 KiB
C
437 lines
10 KiB
C
/* Copyright (C) 1997, 1998, 2001, 2002, 2003, 2005, 2006
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <atomic.h>
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#include <ctype.h>
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#include <errno.h>
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#include <netdb.h>
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#include <nss.h>
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#include <string.h>
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#include <rpcsvc/nis.h>
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#include <bits/libc-lock.h>
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#include "nss-nisplus.h"
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__libc_lock_define_initialized (static, lock)
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static nis_result *result;
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static nis_name tablename_val;
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static u_long tablename_len;
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#define NISENTRYVAL(idx,col,res) \
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((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
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#define NISENTRYLEN(idx,col,res) \
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((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
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static int
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_nss_nisplus_parse_protoent (nis_result * result, struct protoent *proto,
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char *buffer, size_t buflen, int *errnop)
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{
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char *first_unused = buffer;
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size_t room_left = buflen;
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unsigned int i;
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char *p, *line;
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if (result == NULL)
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return 0;
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if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
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|| __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
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|| strcmp (NIS_RES_OBJECT (result)->EN_data.en_type,
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"protocols_tbl") != 0
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|| NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 3)
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return 0;
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/* Generate the protocols entry format and use the normal parser */
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if (NISENTRYLEN (0, 0, result) + 1 > room_left)
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{
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no_more_room:
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*errnop = ERANGE;
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return -1;
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}
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strncpy (first_unused, NISENTRYVAL (0, 0, result),
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NISENTRYLEN (0, 0, result));
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first_unused[NISENTRYLEN (0, 0, result)] = '\0';
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proto->p_name = first_unused;
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room_left -= (strlen (first_unused) +1);
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first_unused += strlen (first_unused) +1;
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if (NISENTRYLEN (0, 2, result) + 1 > room_left)
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goto no_more_room;
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proto->p_proto = atoi (NISENTRYVAL (0, 2, result));
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p = first_unused;
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line = p;
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for (i = 0; i < result->objects.objects_len; ++i)
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{
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if (strcmp (NISENTRYVAL (i, 1, result), proto->p_name) != 0)
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{
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if (NISENTRYLEN (i, 1, result) + 2 > room_left)
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goto no_more_room;
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*p++ = ' ';
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p = __stpncpy (p, NISENTRYVAL (i, 1, result),
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NISENTRYLEN (i, 1, result));
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*p = '\0';
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room_left -= (NISENTRYLEN (i, 1, result) + 1);
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}
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}
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*p++ = '\0';
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first_unused = p;
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/* Adjust the pointer so it is aligned for
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storing pointers. */
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first_unused += __alignof__ (char *) - 1;
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first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
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proto->p_aliases = (char **) first_unused;
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if (room_left < sizeof (char *))
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goto no_more_room;
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room_left -= sizeof (char *);
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proto->p_aliases[0] = NULL;
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i = 0;
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while (*line != '\0')
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{
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/* Skip leading blanks. */
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while (isspace (*line))
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line++;
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if (*line == '\0')
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break;
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if (room_left < sizeof (char *))
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goto no_more_room;
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room_left -= sizeof (char *);
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proto->p_aliases[i] = line;
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while (*line != '\0' && *line != ' ')
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++line;
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if (*line == ' ')
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{
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*line = '\0';
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++line;
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++i;
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}
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else
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proto->p_aliases[i+1] = NULL;
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}
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return 1;
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}
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static enum nss_status
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_nss_create_tablename (int *errnop)
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{
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if (tablename_val == NULL)
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{
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const char *local_dir = nis_local_directory ();
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size_t local_dir_len = strlen (local_dir);
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static const char prefix[] = "protocols.org_dir.";
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char *p = malloc (sizeof (prefix) + local_dir_len);
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if (p == NULL)
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{
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*errnop = errno;
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return NSS_STATUS_TRYAGAIN;
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}
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memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
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tablename_len = sizeof (prefix) - 1 + local_dir_len;
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atomic_write_barrier ();
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tablename_val = p;
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}
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nisplus_setprotoent (int stayopen)
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{
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enum nss_status status = NSS_STATUS_SUCCESS;
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__libc_lock_lock (lock);
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if (result != NULL)
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{
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nis_freeresult (result);
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result = NULL;
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}
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if (tablename_val == NULL)
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{
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int err;
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status = _nss_create_tablename (&err);
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}
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__libc_lock_unlock (lock);
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return status;
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}
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enum nss_status
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_nss_nisplus_endprotoent (void)
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{
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__libc_lock_lock (lock);
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if (result != NULL)
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{
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nis_freeresult (result);
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result = NULL;
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}
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__libc_lock_unlock (lock);
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return NSS_STATUS_SUCCESS;
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}
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static enum nss_status
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internal_nisplus_getprotoent_r (struct protoent *proto, char *buffer,
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size_t buflen, int *errnop)
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{
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int parse_res;
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/* Get the next entry until we found a correct one. */
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do
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{
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nis_result *saved_res;
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if (result == NULL)
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{
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saved_res = NULL;
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if (tablename_val == NULL)
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{
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enum nss_status status = _nss_create_tablename (errnop);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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}
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result = nis_first_entry (tablename_val);
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if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
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return niserr2nss (result->status);
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}
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else
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{
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saved_res = result;
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result = nis_next_entry (tablename_val, &result->cookie);
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if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
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{
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nis_freeresult (saved_res);
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return niserr2nss (result->status);
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}
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}
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parse_res = _nss_nisplus_parse_protoent (result, proto, buffer,
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buflen, errnop);
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if (parse_res == -1)
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{
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nis_freeresult (result);
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result = saved_res;
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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else
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{
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if (saved_res)
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nis_freeresult (saved_res);
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}
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}
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while (!parse_res);
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nisplus_getprotoent_r (struct protoent *result, char *buffer,
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size_t buflen, int *errnop)
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{
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int status;
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__libc_lock_lock (lock);
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status = internal_nisplus_getprotoent_r (result, buffer, buflen, errnop);
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__libc_lock_unlock (lock);
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return status;
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}
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enum nss_status
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_nss_nisplus_getprotobyname_r (const char *name, struct protoent *proto,
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char *buffer, size_t buflen, int *errnop)
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{
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int parse_res;
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if (tablename_val == NULL)
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{
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__libc_lock_lock (lock);
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enum nss_status status = _nss_create_tablename (errnop);
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__libc_lock_unlock (lock);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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}
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if (name == NULL)
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return NSS_STATUS_NOTFOUND;
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char buf[strlen (name) + 10 + tablename_len];
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int olderr = errno;
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/* Search at first in the alias list, and use the correct name
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for the next search */
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snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
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nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
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if (result != NULL)
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{
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char *bufptr = buf;
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/* If we did not find it, try it as original name. But if the
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database is correct, we should find it in the first case, too */
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if ((result->status != NIS_SUCCESS
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&& result->status != NIS_S_SUCCESS)
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|| __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
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|| strcmp (result->objects.objects_val->EN_data.en_type,
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"protocols_tbl") != 0
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|| result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
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snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val);
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else
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{
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/* We need to allocate a new buffer since there is no
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guarantee the returned name has a length limit. */
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const char *entryval = NISENTRYVAL (0, 0, result);
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size_t buflen = strlen (entryval) + 10 + tablename_len;
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bufptr = alloca (buflen);
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snprintf (bufptr, buflen, "[cname=%s],%s",
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entryval, tablename_val);
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}
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nis_freeresult (result);
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result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
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}
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if (result == NULL)
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{
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__set_errno (ENOMEM);
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return NSS_STATUS_TRYAGAIN;
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}
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if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
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{
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enum nss_status status = niserr2nss (result->status);
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__set_errno (olderr);
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nis_freeresult (result);
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return status;
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}
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parse_res = _nss_nisplus_parse_protoent (result, proto, buffer, buflen,
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errnop);
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nis_freeresult (result);
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if (parse_res < 1)
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{
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if (parse_res == -1)
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{
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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else
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{
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__set_errno (olderr);
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return NSS_STATUS_NOTFOUND;
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}
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}
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nisplus_getprotobynumber_r (const int number, struct protoent *proto,
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char *buffer, size_t buflen, int *errnop)
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{
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if (tablename_val == NULL)
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{
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__libc_lock_lock (lock);
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enum nss_status status = _nss_create_tablename (errnop);
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__libc_lock_unlock (lock);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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}
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char buf[12 + 3 * sizeof (number) + tablename_len];
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int olderr = errno;
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snprintf (buf, sizeof (buf), "[number=%d],%s", number, tablename_val);
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nis_result *result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
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if (result == NULL)
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{
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__set_errno (ENOMEM);
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return NSS_STATUS_TRYAGAIN;
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}
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if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
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{
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enum nss_status status = niserr2nss (result->status);
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__set_errno (olderr);
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nis_freeresult (result);
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return status;
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}
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int parse_res = _nss_nisplus_parse_protoent (result, proto, buffer, buflen,
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errnop);
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nis_freeresult (result);
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if (parse_res < 1)
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{
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if (parse_res == -1)
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{
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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else
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{
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__set_errno (olderr);
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return NSS_STATUS_NOTFOUND;
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}
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}
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return NSS_STATUS_SUCCESS;
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}
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