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338 lines
7.7 KiB
C
338 lines
7.7 KiB
C
/* Copyright (C) 1997-2016 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, see
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<http://www.gnu.org/licenses/>. */
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#include <atomic.h>
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#include <nss.h>
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#include <errno.h>
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#include <ctype.h>
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#include <string.h>
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#include <aliases.h>
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#include <libc-lock.h>
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#include <rpcsvc/nis.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 u_long next_entry;
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static nis_name tablename_val;
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static size_t tablename_len;
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#define NISENTRYVAL(idx, col, res) \
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(NIS_RES_OBJECT (res)[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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(NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_len)
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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[] = "mail_aliases.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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static int
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_nss_nisplus_parse_aliasent (nis_result *result, unsigned long entry,
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struct aliasent *alias, char *buffer,
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size_t buflen, int *errnop)
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{
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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)[entry]) != NIS_ENTRY_OBJ
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|| strcmp (NIS_RES_OBJECT (result)[entry].EN_data.en_type,
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"mail_aliases") != 0
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|| NIS_RES_OBJECT (result)[entry].EN_data.en_cols.en_cols_len < 2)
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return 0;
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if (NISENTRYLEN (entry, 1, result) >= buflen)
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{
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/* The line is too long for our buffer. */
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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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char *cp = __stpncpy (buffer, NISENTRYVAL (entry, 1, result),
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NISENTRYLEN (entry, 1, result));
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*cp = '\0';
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char *first_unused = cp + 1;
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size_t room_left = buflen - (first_unused - buffer);
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alias->alias_local = 0;
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alias->alias_members_len = 0;
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if (NISENTRYLEN (entry, 0, result) >= room_left)
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goto no_more_room;
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cp = __stpncpy (first_unused, NISENTRYVAL (entry, 0, result),
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NISENTRYLEN (entry, 0, result));
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*cp = '\0';
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alias->alias_name = first_unused;
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/* Terminate the line for any case. */
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cp = strpbrk (alias->alias_name, "#\n");
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if (cp != NULL)
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*cp = '\0';
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size_t len = strlen (alias->alias_name) + 1;
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first_unused += len;
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room_left -= len;
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/* Adjust the pointer so it is aligned for
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storing pointers. */
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size_t adjust = ((__alignof__ (char *)
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- (first_unused - (char *) 0) % __alignof__ (char *))
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% __alignof__ (char *));
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if (room_left < adjust)
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goto no_more_room;
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first_unused += adjust;
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room_left -= adjust;
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alias->alias_members = (char **) first_unused;
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char *line = buffer;
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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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alias->alias_members[alias->alias_members_len] = line;
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while (*line != '\0' && *line != ',')
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++line;
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if (line != alias->alias_members[alias->alias_members_len])
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{
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*line++ = '\0';
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++alias->alias_members_len;
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}
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else if (*line == ',')
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++line;
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}
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return alias->alias_members_len == 0 ? 0 : 1;
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}
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static enum nss_status
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internal_setaliasent (void)
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{
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enum nss_status status;
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int err;
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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 (_nss_create_tablename (&err) != NSS_STATUS_SUCCESS)
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return NSS_STATUS_UNAVAIL;
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next_entry = 0;
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result = nis_list (tablename_val, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
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if (result == NULL)
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{
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status = NSS_STATUS_TRYAGAIN;
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__set_errno (ENOMEM);
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}
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else
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{
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status = niserr2nss (result->status);
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if (status != NSS_STATUS_SUCCESS)
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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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}
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return status;
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}
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enum nss_status
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_nss_nisplus_setaliasent (void)
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{
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enum nss_status status;
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__libc_lock_lock (lock);
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status = internal_setaliasent ();
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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_endaliasent (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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next_entry = 0;
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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_getaliasent_r (struct aliasent *alias,
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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 (result == NULL)
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{
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enum nss_status status;
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status = internal_setaliasent ();
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if (result == NULL || status != NSS_STATUS_SUCCESS)
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return status;
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}
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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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if (next_entry >= result->objects.objects_len)
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return NSS_STATUS_NOTFOUND;
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parse_res = _nss_nisplus_parse_aliasent (result, next_entry, alias,
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buffer, buflen, errnop);
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if (parse_res == -1)
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return NSS_STATUS_TRYAGAIN;
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++next_entry;
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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_getaliasent_r (struct aliasent *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_getaliasent_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_getaliasbyname_r (const char *name, struct aliasent *alias,
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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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{
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*errnop = EINVAL;
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return NSS_STATUS_UNAVAIL;
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}
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char buf[strlen (name) + 9 + tablename_len];
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int olderr = errno;
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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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*errnop = ENOMEM;
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return NSS_STATUS_TRYAGAIN;
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}
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if (__glibc_unlikely (niserr2nss (result->status) != NSS_STATUS_SUCCESS))
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{
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enum nss_status status = niserr2nss (result->status);
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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_aliasent (result, 0, alias,
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buffer, buflen, errnop);
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/* We do not need the lookup result anymore. */
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nis_freeresult (result);
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if (__glibc_unlikely (parse_res < 1))
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{
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__set_errno (olderr);
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if (parse_res == -1)
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return NSS_STATUS_TRYAGAIN;
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else
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return NSS_STATUS_NOTFOUND;
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}
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return NSS_STATUS_SUCCESS;
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}
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