source/libads/ldap_utils.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Some Helpful wrappers on LDAP
   5
   6    Copyright (C) Andrew Tridgell 2001
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24
  25 #ifdef HAVE_LDAP
  26 /*
  27   a wrapper around ldap_search_s that retries depending on the error code
  28   this is supposed to catch dropped connections and auto-reconnect
  29 */
  30 ADS_STATUS ads_do_search_retry(ADS_STRUCT *ads, const char *bind_path, int scope,
  31                                const char *expr,
  32                                const char **attrs, void **res)
  33 {
  34         ADS_STATUS status;
  35         int count = 3;
  36         char *bp;
  37
  38         if (!ads->ld &&
  39             time(NULL) - ads->last_attempt < ADS_RECONNECT_TIME) {
  40                 return ADS_ERROR(LDAP_SERVER_DOWN);
  41         }
  42
  43         bp = strdup(bind_path);
  44
  45         if (!bp)
  46                 return ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
  47
  48         while (count--) {
  49                 status = ads_do_search_all(ads, bp, scope, expr, attrs, res);
  50                 if (ADS_ERR_OK(status)) {
  51                         DEBUG(5,("Search for %s gave %d replies\n",
  52                                  expr, ads_count_replies(ads, *res)));
  53                         free(bp);
  54                         return status;
  55                 }
  56
  57                 if (*res) ads_msgfree(ads, *res);
  58                 *res = NULL;
  59                 DEBUG(3,("Reopening ads connection to realm '%s' after error %s\n",
  60                          ads->config.realm, ads_errstr(status)));
  61                 if (ads->ld) {
  62                         ldap_unbind(ads->ld);
  63                 }
  64                 ads->ld = NULL;
  65                 status = ads_connect(ads);
  66                 if (!ADS_ERR_OK(status)) {
  67                         DEBUG(1,("ads_search_retry: failed to reconnect (%s)\n",
  68                                  ads_errstr(status)));
  69                         ads_destroy(&ads);
  70                         free(bp);
  71                         return status;
  72                 }
  73         }
  74         free(bp);
  75
  76         DEBUG(1,("ads reopen failed after error %s\n", ads_errstr(status)));
  77         return status;
  78 }
  79
  80
  81 ADS_STATUS ads_search_retry(ADS_STRUCT *ads, void **res,
  82                             const char *expr,
  83                             const char **attrs)
  84 {
  85         return ads_do_search_retry(ads, ads->config.bind_path, LDAP_SCOPE_SUBTREE,
  86                                    expr, attrs, res);
  87 }
  88
  89 ADS_STATUS ads_search_retry_dn(ADS_STRUCT *ads, void **res,
  90                                const char *dn,
  91                                const char **attrs)
  92 {
  93         return ads_do_search_retry(ads, dn, LDAP_SCOPE_BASE,
  94                                    "(objectclass=*)", attrs, res);
  95 }
  96 #endif