r25060: Fix formatting, remove trailing spaces and cut lines longer than 80 chars
[ira/wip.git] / source3 / nsswitch / idmap.c
index 885950830eb6ab6e4e3dc7d85b878dbe5f85f886..009d7a610ba3d8945d2d6b6fc1fee7717af19254 100644 (file)
@@ -1,14 +1,14 @@
-/* 
+/*
    Unix SMB/CIFS implementation.
    ID Mapping
    Copyright (C) Tim Potter 2000
    Copyright (C) Jim McDonough <jmcd@us.ibm.com>       2003
-   Copyright (C) Simo Sorce 2003
+   Copyright (C) Simo Sorce 2003-2007
    Copyright (C) Jeremy Allison 2006
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
+   the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
@@ -17,8 +17,7 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include "includes.h"
@@ -43,6 +42,12 @@ struct idmap_alloc_backend {
 
 struct idmap_cache_ctx;
 
+struct idmap_alloc_context {
+       const char *params;
+       struct idmap_alloc_methods *methods;
+       BOOL initialized;
+};
+
 static TALLOC_CTX *idmap_ctx = NULL;
 static struct idmap_cache_ctx *idmap_cache;
 
@@ -53,12 +58,25 @@ static int pdb_dom_num = -1;
 static int def_dom_num = -1;
 
 static struct idmap_alloc_backend *alloc_backends = NULL;
-static struct idmap_alloc_methods *alloc_methods = NULL;
-
-#define IDMAP_CHECK_RET(ret) do { if ( ! NT_STATUS_IS_OK(ret)) { DEBUG(2, ("ERROR: NTSTATUS = 0x%08x\n", NT_STATUS_V(ret))); goto done; } } while(0)
-#define IDMAP_CHECK_ALLOC(mem) do { if (!mem) { DEBUG(0, ("Out of memory!\n")); ret = NT_STATUS_NO_MEMORY; goto done; } } while(0)
-
-static struct idmap_methods *get_methods(struct idmap_backend *be, const char *name)
+static struct idmap_alloc_context *idmap_alloc_ctx = NULL;
+
+#define IDMAP_CHECK_RET(ret) do { \
+       if ( ! NT_STATUS_IS_OK(ret)) { \
+               DEBUG(2, ("ERROR: NTSTATUS = 0x%08x\n", NT_STATUS_V(ret))); \
+                       goto done; \
+       } } while(0)
+#define IDMAP_REPORT_RET(ret) do { \
+       if ( ! NT_STATUS_IS_OK(ret)) { \
+               DEBUG(2, ("ERROR: NTSTATUS = 0x%08x\n", NT_STATUS_V(ret))); \
+       } } while(0)
+#define IDMAP_CHECK_ALLOC(mem) do { \
+       if (!mem) { \
+               DEBUG(0, ("Out of memory!\n")); ret = NT_STATUS_NO_MEMORY; \
+               goto done; \
+       } } while(0)
+
+static struct idmap_methods *get_methods(struct idmap_backend *be,
+                                        const char *name)
 {
        struct idmap_backend *b;
 
@@ -71,7 +89,9 @@ static struct idmap_methods *get_methods(struct idmap_backend *be, const char *n
        return NULL;
 }
 
-static struct idmap_alloc_methods *get_alloc_methods(struct idmap_alloc_backend *be, const char *name)
+static struct idmap_alloc_methods *get_alloc_methods(
+                                               struct idmap_alloc_backend *be,
+                                               const char *name)
 {
        struct idmap_alloc_backend *b;
 
@@ -84,29 +104,18 @@ static struct idmap_alloc_methods *get_alloc_methods(struct idmap_alloc_backend
        return NULL;
 }
 
-/* part of a quick hack to avoid loops, need to be sorted out correctly later on */
-static BOOL idmap_in_own_child;
-
-static BOOL idmap_is_in_own_child(void)
-{
-       return idmap_in_own_child;
-}
-
-void reset_idmap_in_own_child(void)
+BOOL idmap_is_offline(void)
 {
-       idmap_in_own_child = False;
-}
-
-void set_idmap_in_own_child(void)
-{
-       idmap_in_own_child = True;
+       return ( lp_winbind_offline_logon() &&
+            get_global_winbindd_state_offline() );
 }
 
 /**********************************************************************
  Allow a module to register itself as a method.
 **********************************************************************/
 
-NTSTATUS smb_register_idmap(int version, const char *name, struct idmap_methods *methods)
+NTSTATUS smb_register_idmap(int version, const char *name,
+                           struct idmap_methods *methods)
 {
        struct idmap_methods *test;
        struct idmap_backend *entry;
@@ -117,9 +126,11 @@ NTSTATUS smb_register_idmap(int version, const char *name, struct idmap_methods
 
        if ((version != SMB_IDMAP_INTERFACE_VERSION)) {
                DEBUG(0, ("Failed to register idmap module.\n"
-                         "The module was compiled against SMB_IDMAP_INTERFACE_VERSION %d,\n"
+                         "The module was compiled against "
+                         "SMB_IDMAP_INTERFACE_VERSION %d,\n"
                          "current SMB_IDMAP_INTERFACE_VERSION is %d.\n"
-                         "Please recompile against the current version of samba!\n",  
+                         "Please recompile against the current version "
+                         "of samba!\n",
                          version, SMB_IDMAP_INTERFACE_VERSION));
                return NT_STATUS_OBJECT_TYPE_MISMATCH;
        }
@@ -156,7 +167,8 @@ NTSTATUS smb_register_idmap(int version, const char *name, struct idmap_methods
  Allow a module to register itself as a method.
 **********************************************************************/
 
-NTSTATUS smb_register_idmap_alloc(int version, const char *name, struct idmap_alloc_methods *methods)
+NTSTATUS smb_register_idmap_alloc(int version, const char *name,
+                                 struct idmap_alloc_methods *methods)
 {
        struct idmap_alloc_methods *test;
        struct idmap_alloc_backend *entry;
@@ -167,9 +179,11 @@ NTSTATUS smb_register_idmap_alloc(int version, const char *name, struct idmap_al
 
        if ((version != SMB_IDMAP_INTERFACE_VERSION)) {
                DEBUG(0, ("Failed to register idmap alloc module.\n"
-                         "The module was compiled against SMB_IDMAP_INTERFACE_VERSION %d,\n"
+                         "The module was compiled against "
+                         "SMB_IDMAP_INTERFACE_VERSION %d,\n"
                          "current SMB_IDMAP_INTERFACE_VERSION is %d.\n"
-                         "Please recompile against the current version of samba!\n",  
+                         "Please recompile against the current version "
+                         "of samba!\n",
                          version, SMB_IDMAP_INTERFACE_VERSION));
                return NT_STATUS_OBJECT_TYPE_MISMATCH;
        }
@@ -221,9 +235,9 @@ static int close_domain_destructor(struct idmap_domain *dom)
 NTSTATUS idmap_close(void)
 {
        /* close the alloc backend first before freeing idmap_ctx */
-       if (alloc_methods) {
-               alloc_methods->close_fn();
-               alloc_methods = NULL;
+       if (idmap_alloc_ctx) {
+               idmap_alloc_ctx->methods->close_fn();
+               idmap_alloc_ctx->methods = NULL;
        }
        alloc_backends = NULL;
 
@@ -247,14 +261,14 @@ static const char *idmap_default_domain[] = { "default domain", NULL };
  ****************************************************************************/
 
 NTSTATUS idmap_init_cache(void)
-{      
+{
        /* Always initialize the cache.  We'll have to delay initialization
           of backends if we are offline */
 
        if ( idmap_ctx ) {
                return NT_STATUS_OK;
-       }       
-       
+       }
+
        if ( (idmap_ctx = talloc_named_const(NULL, 0, "idmap_ctx")) == NULL ) {
                return NT_STATUS_NO_MEMORY;
        }
@@ -270,9 +284,9 @@ NTSTATUS idmap_init_cache(void)
  ****************************************************************************/
 
 NTSTATUS idmap_init(void)
-{      
+{
        NTSTATUS ret;
-       static NTSTATUS backend_init_status = NT_STATUS_UNSUCCESSFUL;   
+       static NTSTATUS idmap_init_status = NT_STATUS_UNSUCCESSFUL;
        struct idmap_domain *dom;
        char *compat_backend = NULL;
        char *compat_params = NULL;
@@ -283,68 +297,77 @@ NTSTATUS idmap_init(void)
        int compat = 0;
        int i;
 
-       /* Always initialize the cache.  We'll have to delay initialization
-          of backends if we are offline */
-
        ret = idmap_init_cache();
-       if ( !NT_STATUS_IS_OK(ret) )
+       if (!NT_STATUS_IS_OK(ret))
                return ret;
 
-       if ( NT_STATUS_IS_OK(backend_init_status) ) {
+       if (NT_STATUS_IS_OK(idmap_init_status)) {
                return NT_STATUS_OK;
        }
-       
-       /* We can't reliably call intialization code here unless 
-          we are online */
+
+       /* We can't reliably call intialization code here unless
+          we are online.  But return NT_STATUS_OK so the upper
+          level code doesn't abort idmap lookups. */
 
        if ( get_global_winbindd_state_offline() ) {
-               backend_init_status = NT_STATUS_FILE_IS_OFFLINE;
-               return backend_init_status;             
+               idmap_init_status = NT_STATUS_FILE_IS_OFFLINE;
+               return NT_STATUS_OK;
        }
 
        static_init_idmap;
 
        dom_list = lp_idmap_domains();
-       
-       if ( dom_list && lp_idmap_backend() ) {
-               DEBUG(0, ("WARNING: idmap backend and idmap domains are "
-                         "mutually excusive!\n"));
-               DEBUGADD(0,("idmap backend option will be IGNORED!\n"));
-       } else if ( lp_idmap_backend() ) {
-               const char **compat_list = lp_idmap_backend();
-               char *p = NULL;
-               const char *q = NULL;           
 
-               compat = 1;
+       if ( lp_idmap_backend() ) {
+                       const char **compat_list = lp_idmap_backend();
+               char *p = NULL;
+               const char *q = NULL;
 
-               if ( (compat_backend = talloc_strdup( idmap_ctx, *compat_list )) == NULL ) {
-                       ret = NT_STATUS_NO_MEMORY;
-                       goto done;                      
-               }
-               
-               /* strip any leading idmap_ prefix of */
-               if (strncmp(*compat_list, "idmap_", 6) == 0 ) {
-                       q = *compat_list += 6;
-                       DEBUG(0, ("WARNING: idmap backend uses obsolete and "
-                                 "deprecated 'idmap_' prefix.\n"
-                                 "Please replace 'idmap_%s' by '%s' in %s\n", 
-                                 q, q, dyn_CONFIGFILE));
-                       compat_backend = talloc_strdup( idmap_ctx, q);
+               if ( dom_list ) {
+                       DEBUG(0, ("WARNING: idmap backend and idmap domains are"
+                                 " mutually exclusive!\n"));
+                       DEBUGADD(0,("idmap backend option will be IGNORED!\n"));
                } else {
-                       compat_backend = talloc_strdup( idmap_ctx, *compat_list);
-               }
-                       
-               /* separate the backend and module arguements */
-               if ((p = strchr(compat_backend, ':')) != NULL) {
-                       *p = '\0';                      
-                       compat_params = p + 1;
+                       compat = 1;
+
+                       compat_backend = talloc_strdup(idmap_ctx, *compat_list);
+                       if (compat_backend == NULL ) {
+                               ret = NT_STATUS_NO_MEMORY;
+                               goto done;
+                       }
+
+                       /* strip any leading idmap_ prefix of */
+                       if (strncmp(*compat_list, "idmap_", 6) == 0 ) {
+                               q = *compat_list += 6;
+                               DEBUG(0, ("WARNING: idmap backend uses obsolete"
+                                         " and deprecated 'idmap_' prefix.\n"
+                                         "Please replace 'idmap_%s' by '%s' in"
+                                         " %s\n", q, q, dyn_CONFIGFILE));
+                               compat_backend = talloc_strdup(idmap_ctx, q);
+                       } else {
+                               compat_backend = talloc_strdup(idmap_ctx,
+                                                              *compat_list);
+                       }
+
+                       /* separate the backend and module arguements */
+                       if ((p = strchr(compat_backend, ':')) != NULL) {
+                               *p = '\0';
+                               compat_params = p + 1;
+                       }
                }
+       } else if ( !dom_list ) {
+               /* Back compatible: without idmap domains and explicit
+                  idmap backend.  Taking default idmap backend: tdb */
+
+               compat = 1;
+               compat_backend = talloc_strdup( idmap_ctx, "tdb");
+               compat_params = compat_backend;
        }
 
        if ( ! dom_list) {
                dom_list = idmap_default_domain;
        }
-       
+
        /***************************
         * initialize idmap domains
         */
@@ -355,10 +378,10 @@ NTSTATUS idmap_init(void)
                char *config_option;
 
                /* ignore BUILTIN and local MACHINE domains */
-               if ( strequal(dom_list[i], "BUILTIN") 
-                    || strequal(dom_list[i], get_global_sam_name() ) ) 
+               if (strequal(dom_list[i], "BUILTIN")
+                    || strequal(dom_list[i], get_global_sam_name()))
                {
-                       DEBUG(0,("idmap_init: Ignoring invalid domain %s\n", 
+                       DEBUG(0,("idmap_init: Ignoring invalid domain %s\n",
                                 dom_list[i]));
                        continue;
                }
@@ -367,44 +390,50 @@ NTSTATUS idmap_init(void)
                        pri_dom_is_in_list = True;
                }
                /* init domain */
-               
-               dom = talloc_zero(idmap_ctx, struct idmap_domain);
+
+               dom = TALLOC_ZERO_P(idmap_ctx, struct idmap_domain);
                IDMAP_CHECK_ALLOC(dom);
 
                dom->name = talloc_strdup(dom, dom_list[i]);
                IDMAP_CHECK_ALLOC(dom->name);
 
-               config_option = talloc_asprintf(dom, "idmap config %s", dom->name);
+               config_option = talloc_asprintf(dom, "idmap config %s",
+                                               dom->name);
                IDMAP_CHECK_ALLOC(config_option);
 
                /* default or specific ? */
 
-               dom->default_domain = lp_parm_bool(-1, config_option, "default", False);
+               dom->default_domain = lp_parm_bool(-1, config_option,
+                                                  "default", False);
 
                if (dom->default_domain ||
                    strequal(dom_list[i], idmap_default_domain[0])) {
 
-                       /* make sure this is set even when we match idmap_default_domain[0] */
+                       /* make sure this is set even when we match
+                        * idmap_default_domain[0] */
                        dom->default_domain = True;
 
                        if (default_already_defined) {
-                               DEBUG(1, ("ERROR: Multiple domains defined as default!\n"));
+                               DEBUG(1, ("ERROR: Multiple domains defined as"
+                                         " default!\n"));
                                ret = NT_STATUS_INVALID_PARAMETER;
                                goto done;
                        }
 
                        default_already_defined = True;
 
-               } 
+               }
 
-               dom->readonly = lp_parm_bool(-1, config_option, "readonly", False);
+               dom->readonly = lp_parm_bool(-1, config_option,
+                                            "readonly", False);
 
                /* find associated backend (default: tdb) */
                if (compat) {
                        parm_backend = talloc_strdup(idmap_ctx, compat_backend);
                } else {
-                       parm_backend = talloc_strdup(idmap_ctx,
-                                                    lp_parm_const_string(-1, config_option, "backend", "tdb"));
+                       char *backend = lp_parm_const_string(-1, config_option,
+                                                            "backend", "tdb");
+                       parm_backend = talloc_strdup(idmap_ctx, backend);
                }
                IDMAP_CHECK_ALLOC(parm_backend);
 
@@ -414,33 +443,45 @@ NTSTATUS idmap_init(void)
                if ( ! dom->methods) {
                        ret = smb_probe_module("idmap", parm_backend);
                        if (NT_STATUS_IS_OK(ret)) {
-                               dom->methods = get_methods(backends, parm_backend);
+                               dom->methods = get_methods(backends,
+                                                          parm_backend);
                        }
                }
                if ( ! dom->methods) {
-                       DEBUG(0, ("ERROR: Could not get methods for backend %s\n", parm_backend));
+                       DEBUG(0, ("ERROR: Could not get methods for "
+                                 "backend %s\n", parm_backend));
                        ret = NT_STATUS_UNSUCCESSFUL;
                        goto done;
                }
 
-               /* check the set_mapping function exists otherwise mark the module as readonly */
+               /* check the set_mapping function exists otherwise mark the
+                * module as readonly */
                if ( ! dom->methods->set_mapping) {
-                       DEBUG(5, ("Forcing to readonly, as ithis module can't store arbitrary mappings.\n"));
+                       DEBUG(5, ("Forcing to readonly, as this module can't"
+                                 " store arbitrary mappings.\n"));
                        dom->readonly = True;
                }
 
-               /* now that we have methods, set the destructor for this domain */
+               /* now that we have methods,
+                * set the destructor for this domain */
                talloc_set_destructor(dom, close_domain_destructor);
 
+               if (compat_params) {
+                       dom->params = talloc_strdup(dom, compat_params);
+                       IDMAP_CHECK_ALLOC(dom->params);
+               } else {
+                       dom->params = NULL;
+               }
+
                /* Finally instance a backend copy for this domain */
-               ret = dom->methods->init(dom, compat_params);
+               ret = dom->methods->init(dom);
                if ( ! NT_STATUS_IS_OK(ret)) {
-                       DEBUG(0, ("ERROR: Initialization failed for backend %s (domain %s)\n",
-                                               parm_backend, dom->name));
-                       ret = NT_STATUS_UNSUCCESSFUL;
-                       goto done;
+                       DEBUG(0, ("ERROR: Initialization failed for backend "
+                                 "%s (domain %s), deferred!\n",
+                                 parm_backend, dom->name));
                }
-               idmap_domains = talloc_realloc(idmap_ctx, idmap_domains, struct idmap_domain *, i+1);
+               idmap_domains = talloc_realloc(idmap_ctx, idmap_domains,
+                                               struct idmap_domain *, i+1);
                if ( ! idmap_domains) {
                        DEBUG(0, ("Out of memory!\n"));
                        ret = NT_STATUS_NO_MEMORY;
@@ -448,13 +489,15 @@ NTSTATUS idmap_init(void)
                }
                idmap_domains[i] = dom;
 
-               if (dom->default_domain) { /* save default domain position for future uses */
+               /* save default domain position for future uses */
+               if (dom->default_domain) {
                        def_dom_num = i;
                }
 
                DEBUG(10, ("Domain %s - Backend %s - %sdefault - %sreadonly\n",
                                dom->name, parm_backend,
-                               dom->default_domain?"":"not ", dom->readonly?"":"not "));
+                               dom->default_domain?"":"not ",
+                               dom->readonly?"":"not "));
 
                talloc_free(config_option);
        }
@@ -467,7 +510,7 @@ NTSTATUS idmap_init(void)
            ( ! pri_dom_is_in_list) &&
            lp_winbind_trusted_domains_only()) {
 
-               dom = talloc_zero(idmap_ctx, struct idmap_domain);
+               dom = TALLOC_ZERO_P(idmap_ctx, struct idmap_domain);
                IDMAP_CHECK_ALLOC(dom);
 
                dom->name = talloc_strdup(dom, lp_workgroup());
@@ -481,23 +524,34 @@ NTSTATUS idmap_init(void)
 
                /* (the nss module is always statically linked) */
                if ( ! dom->methods) {
-                       DEBUG(0, ("ERROR: Could not get methods for idmap_nss ?!\n"));
+                       DEBUG(0, ("ERROR: No methods for idmap_nss ?!\n"));
                        ret = NT_STATUS_UNSUCCESSFUL;
                        goto done;
                }
 
-               /* now that we have methods, set the destructor for this domain */
+               /* now that we have methods,
+                * set the destructor for this domain */
                talloc_set_destructor(dom, close_domain_destructor);
 
+               if (compat_params) {
+                       dom->params = talloc_strdup(dom, compat_params);
+                       IDMAP_CHECK_ALLOC(dom->params);
+               } else {
+                       dom->params = NULL;
+               }
+
                /* Finally instance a backend copy for this domain */
-               ret = dom->methods->init(dom, compat_params);
+               ret = dom->methods->init(dom);
                if ( ! NT_STATUS_IS_OK(ret)) {
-                       DEBUG(0, ("ERROR: Initialization failed for idmap_nss ?!\n"));
+                       DEBUG(0, ("ERROR: Init. failed for idmap_nss ?!\n"));
                        ret = NT_STATUS_UNSUCCESSFUL;
                        goto done;
                }
 
-               idmap_domains = talloc_realloc(idmap_ctx, idmap_domains, struct idmap_domain *, num_domains+1);
+               idmap_domains = talloc_realloc(idmap_ctx,
+                                               idmap_domains,
+                                               struct idmap_domain *,
+                                               num_domains+1);
                if ( ! idmap_domains) {
                        DEBUG(0, ("Out of memory!\n"));
                        ret = NT_STATUS_NO_MEMORY;
@@ -505,13 +559,14 @@ NTSTATUS idmap_init(void)
                }
                idmap_domains[num_domains] = dom;
 
-               DEBUG(10, ("Domain %s - Backend nss - not default - readonly\n", dom->name ));
+               DEBUG(10, ("Domain %s - Backend nss - not default - readonly\n",
+                          dom->name ));
 
                num_domains++;
        }
 
        /**** automatically add idmap_passdb backend ****/
-       dom = talloc_zero(idmap_ctx, struct idmap_domain);
+       dom = TALLOC_ZERO_P(idmap_ctx, struct idmap_domain);
        IDMAP_CHECK_ALLOC(dom);
 
        dom->name = talloc_strdup(dom, get_global_sam_name());
@@ -525,7 +580,7 @@ NTSTATUS idmap_init(void)
 
        /* (the passdb module is always statically linked) */
        if ( ! dom->methods) {
-               DEBUG(0, ("ERROR: Could not get methods for idmap_passdb ?!\n"));
+               DEBUG(0, ("ERROR: No methods for idmap_passdb ?!\n"));
                ret = NT_STATUS_UNSUCCESSFUL;
                goto done;
        }
@@ -533,15 +588,25 @@ NTSTATUS idmap_init(void)
        /* now that we have methods, set the destructor for this domain */
        talloc_set_destructor(dom, close_domain_destructor);
 
+       if (compat_params) {
+               dom->params = talloc_strdup(dom, compat_params);
+               IDMAP_CHECK_ALLOC(dom->params);
+       } else {
+               dom->params = NULL;
+       }
+
        /* Finally instance a backend copy for this domain */
-       ret = dom->methods->init(dom, compat_params);
+       ret = dom->methods->init(dom);
        if ( ! NT_STATUS_IS_OK(ret)) {
-               DEBUG(0, ("ERROR: Initialization failed for idmap_passdb ?!\n"));
+               DEBUG(0, ("ERROR: Init. failed for idmap_passdb ?!\n"));
                ret = NT_STATUS_UNSUCCESSFUL;
                goto done;
        }
 
-       idmap_domains = talloc_realloc(idmap_ctx, idmap_domains, struct idmap_domain *, num_domains+1);
+       idmap_domains = talloc_realloc(idmap_ctx,
+                                       idmap_domains,
+                                       struct idmap_domain *,
+                                       num_domains+1);
        if ( ! idmap_domains) {
                DEBUG(0, ("Out of memory!\n"));
                ret = NT_STATUS_NO_MEMORY;
@@ -552,14 +617,16 @@ NTSTATUS idmap_init(void)
        /* needed to handle special BUILTIN and wellknown SIDs cases */
        pdb_dom_num = num_domains;
 
-       DEBUG(10, ("Domain %s - Backend passdb - not default - readonly\n", dom->name));
+       DEBUG(10, ("Domain %s - Backend passdb - not default - readonly\n",
+                  dom->name));
 
        num_domains++;
        /**** finished adding idmap_passdb backend ****/
 
        /* sort domains so that the default is the last one */
        /* don't sort if no default domain defined */
-       if (def_dom_num != -1 && def_dom_num != num_domains-1) { /* default is not last, move it */
+       if (def_dom_num != -1 && def_dom_num != num_domains-1) {
+               /* default is not last, move it */
                struct idmap_domain *tmp;
 
                if (pdb_dom_num > def_dom_num) {
@@ -588,57 +655,102 @@ NTSTATUS idmap_init(void)
                alloc_backend = talloc_strdup(idmap_ctx, compat_backend);
        } else {
                char *ab = lp_idmap_alloc_backend();
-               
+
                if (ab && (ab[0] != '\0')) {
-                       alloc_backend = talloc_strdup(idmap_ctx, lp_idmap_alloc_backend());
+                       alloc_backend = talloc_strdup(idmap_ctx,
+                                                     lp_idmap_alloc_backend());
                }
        }
 
        if ( alloc_backend ) {
 
-               alloc_methods = get_alloc_methods(alloc_backends, alloc_backend);
-               if ( ! alloc_methods) {
+               idmap_alloc_ctx = TALLOC_ZERO_P(idmap_ctx,
+                                               struct idmap_alloc_context);
+               IDMAP_CHECK_ALLOC(idmap_alloc_ctx);
+
+               idmap_alloc_ctx->methods = get_alloc_methods(alloc_backends,
+                                                            alloc_backend);
+               if ( ! idmap_alloc_ctx->methods) {
                        ret = smb_probe_module("idmap", alloc_backend);
                        if (NT_STATUS_IS_OK(ret)) {
-                               alloc_methods = get_alloc_methods(alloc_backends, alloc_backend);
+                               idmap_alloc_ctx->methods =
+                                       get_alloc_methods(alloc_backends,
+                                                         alloc_backend);
                        }
                }
-               if ( alloc_methods) {
-                       ret = alloc_methods->init(compat_params);
+               if (idmap_alloc_ctx->methods) {
+
+                       if (compat_params) {
+                               idmap_alloc_ctx->params =
+                                       talloc_strdup(idmap_alloc_ctx,
+                                                     compat_params);
+                               IDMAP_CHECK_ALLOC(idmap_alloc_ctx->params);
+                       } else {
+                               idmap_alloc_ctx->params = NULL;
+                       }
+
+                       ret = idmap_alloc_ctx->methods->init(idmap_alloc_ctx->params);
                        if ( ! NT_STATUS_IS_OK(ret)) {
-                               DEBUG(0, ("idmap_init: Initialization failed for alloc "
-                                         "backend %s\n", alloc_backend));
-                               ret = NT_STATUS_UNSUCCESSFUL;
-                               goto done;
-               }
+                               DEBUG(0, ("ERROR: Initialization failed for "
+                                         "alloc backend %s, deferred!\n",
+                                         alloc_backend));
+                       } else {
+                               idmap_alloc_ctx->initialized = True;
+                       }
                } else {
-                       DEBUG(2, ("idmap_init: Unable to get methods for alloc backend %s\n", 
+                       DEBUG(2, ("idmap_init: Unable to get methods for "
+                                 "alloc backend %s\n",
                                  alloc_backend));
                        /* certain compat backends are just readonly */
-                       if ( compat )
+                       if ( compat ) {
+                               TALLOC_FREE(idmap_alloc_ctx);
                                ret = NT_STATUS_OK;
-                       else
+                       } else {
                                ret = NT_STATUS_UNSUCCESSFUL;
+                       }
                }
        }
-       
+
        /* cleanpu temporary strings */
        TALLOC_FREE( compat_backend );
-       
-       backend_init_status = NT_STATUS_OK;
-       
+
+       idmap_init_status = NT_STATUS_OK;
+
        return ret;
 
 done:
        DEBUG(0, ("Aborting IDMAP Initialization ...\n"));
        idmap_close();
 
-       /* save the init status for later checks */
-       backend_init_status = ret;
-       
        return ret;
 }
 
+static NTSTATUS idmap_alloc_init(void)
+{
+       NTSTATUS ret;
+
+       if (! NT_STATUS_IS_OK(ret = idmap_init())) {
+               return ret;
+       }
+
+       if ( ! idmap_alloc_ctx) {
+               return NT_STATUS_NOT_SUPPORTED;
+       }
+
+       if ( ! idmap_alloc_ctx->initialized) {
+               ret = idmap_alloc_ctx->methods->init(idmap_alloc_ctx->params);
+               if ( ! NT_STATUS_IS_OK(ret)) {
+                       DEBUG(0, ("ERROR: Initialization failed for alloc "
+                                 "backend, deferred!\n"));
+                       return ret;
+               } else {
+                       idmap_alloc_ctx->initialized = True;
+               }
+       }
+
+       return NT_STATUS_OK;
+}
+
 /**************************************************************************
  idmap allocator interface functions
 **************************************************************************/
@@ -647,60 +759,48 @@ NTSTATUS idmap_allocate_uid(struct unixid *id)
 {
        NTSTATUS ret;
 
-       if (! NT_STATUS_IS_OK(ret = idmap_init())) {
+       if (! NT_STATUS_IS_OK(ret = idmap_alloc_init())) {
                return ret;
        }
 
-       if ( !alloc_methods )
-               return NT_STATUS_NOT_SUPPORTED; 
-
        id->type = ID_TYPE_UID;
-       return alloc_methods->allocate_id(id);
+       return idmap_alloc_ctx->methods->allocate_id(id);
 }
 
 NTSTATUS idmap_allocate_gid(struct unixid *id)
 {
        NTSTATUS ret;
 
-       if (! NT_STATUS_IS_OK(ret = idmap_init())) {
+       if (! NT_STATUS_IS_OK(ret = idmap_alloc_init())) {
                return ret;
        }
 
-       if ( !alloc_methods )
-               return NT_STATUS_NOT_SUPPORTED; 
-
        id->type = ID_TYPE_GID;
-       return alloc_methods->allocate_id(id);
+       return idmap_alloc_ctx->methods->allocate_id(id);
 }
 
 NTSTATUS idmap_set_uid_hwm(struct unixid *id)
 {
        NTSTATUS ret;
 
-       if (! NT_STATUS_IS_OK(ret = idmap_init())) {
+       if (! NT_STATUS_IS_OK(ret = idmap_alloc_init())) {
                return ret;
        }
 
-       if ( !alloc_methods )
-               return NT_STATUS_NOT_SUPPORTED; 
-
        id->type = ID_TYPE_UID;
-       return alloc_methods->set_id_hwm(id);
+       return idmap_alloc_ctx->methods->set_id_hwm(id);
 }
 
 NTSTATUS idmap_set_gid_hwm(struct unixid *id)
 {
        NTSTATUS ret;
 
-       if (! NT_STATUS_IS_OK(ret = idmap_init())) {
+       if (! NT_STATUS_IS_OK(ret = idmap_alloc_init())) {
                return ret;
        }
 
-       if ( !alloc_methods )
-               return NT_STATUS_NOT_SUPPORTED; 
-
        id->type = ID_TYPE_GID;
-       return alloc_methods->set_id_hwm(id);
+       return idmap_alloc_ctx->methods->set_id_hwm(id);
 }
 
 /******************************************************************************
@@ -713,16 +813,16 @@ static struct idmap_domain* find_idmap_domain_from_sid( DOM_SID *account_sid )
        uint32 rid;
        struct winbindd_domain *domain = NULL;
        int i;
-       
+
        /* 1. Handle BUILTIN or Special SIDs and prevent them from
           falling into the default domain space (if we have a
           configured passdb backend. */
 
-       if ( (pdb_dom_num != -1) && 
+       if ( (pdb_dom_num != -1) &&
             (sid_check_is_in_builtin(account_sid) ||
              sid_check_is_in_wellknown_domain(account_sid) ||
              sid_check_is_in_unix_groups(account_sid) ||
-             sid_check_is_in_unix_users(account_sid)) ) 
+             sid_check_is_in_unix_users(account_sid)) )
        {
                return idmap_domains[pdb_dom_num];
        }
@@ -730,8 +830,8 @@ static struct idmap_domain* find_idmap_domain_from_sid( DOM_SID *account_sid )
        /* 2. Lookup the winbindd_domain from the account_sid */
 
        sid_copy( &domain_sid, account_sid );
-       sid_split_rid( &domain_sid, &rid );     
-       domain = find_domain_from_sid_noinit( &domain_sid );    
+       sid_split_rid( &domain_sid, &rid );
+       domain = find_domain_from_sid_noinit( &domain_sid );
 
        for (i = 0; domain && i < num_domains; i++) {
                if ( strequal( idmap_domains[i]->name, domain->name ) ) {
@@ -755,13 +855,13 @@ static struct idmap_domain* find_idmap_domain_from_sid( DOM_SID *account_sid )
 static uint32 find_idmap_domain_index( struct idmap_domain *id_domain)
 {
        int i;
-       
+
        for (i = 0; i < num_domains; i++) {
                if ( idmap_domains[i] == id_domain )
-                       return i;               
+                       return i;
        }
 
-       return -1;      
+       return -1;
 }
 
 
@@ -769,15 +869,21 @@ static uint32 find_idmap_domain_index( struct idmap_domain *id_domain)
  Check if creating a mapping is permitted for the domain
 *********************************************************/
 
-static NTSTATUS idmap_can_map(const struct id_map *map, struct idmap_domain **ret_dom)
+static NTSTATUS idmap_can_map(const struct id_map *map,
+                             struct idmap_domain **ret_dom)
 {
        struct idmap_domain *dom;
 
-       /* Check we do not create mappings for our own local domain, or BUILTIN or special SIDs */
+       /* Check we do not create mappings for our own local domain,
+        * or BUILTIN or special SIDs */
        if ((sid_compare_domain(map->sid, get_global_sam_sid()) == 0) ||
            sid_check_is_in_builtin(map->sid) ||
-           sid_check_is_in_wellknown_domain(map->sid)) {
-               DEBUG(10, ("We are not supposed to create mappings for our own domains (local, builtin, specials)\n"));
+           sid_check_is_in_wellknown_domain(map->sid) ||
+           sid_check_is_in_unix_users(map->sid) ||
+           sid_check_is_in_unix_groups(map->sid) )
+       {
+               DEBUG(10, ("We are not supposed to create mappings for our own "
+                          "domains (local, builtin, specials)\n"));
                return NT_STATUS_UNSUCCESSFUL;
        }
 
@@ -785,21 +891,28 @@ static NTSTATUS idmap_can_map(const struct id_map *map, struct idmap_domain **re
        if (lp_winbind_trusted_domains_only()) {
                struct winbindd_domain *wdom = find_our_domain();
                if (wdom && (sid_compare_domain(map->sid, &wdom->sid) == 0)) {
-                       DEBUG(10, ("We are not supposed to create mappings for our primary domain when <trusted domain only> is True\n"));
-                       DEBUGADD(10, ("Leave [%s] unmapped\n", sid_string_static(map->sid)));
+                       DEBUG(10, ("We are not supposed to create mappings for "
+                                  "our primary domain when <trusted domain "
+                                  "only> is True\n"));
+                       DEBUGADD(10, ("Leave [%s] unmapped\n",
+                                     sid_string_static(map->sid)));
                        return NT_STATUS_UNSUCCESSFUL;
                }
        }
 
        if ( (dom = find_idmap_domain_from_sid( map->sid )) == NULL ) {
-               /* huh, couldn't find a suitable domain, let's just leave it unmapped */
-               DEBUG(10, ("Could not find idmap backend for SID %s", sid_string_static(map->sid)));
+               /* huh, couldn't find a suitable domain,
+                *  let's just leave it unmapped */
+               DEBUG(10, ("Could not find idmap backend for SID %s",
+                          sid_string_static(map->sid)));
                return NT_STATUS_NO_SUCH_DOMAIN;
        }
 
        if (dom->readonly) {
-               /* ouch the domain is read only, let's just leave it unmapped */
-               DEBUG(10, ("idmap backend for SID %s is READONLY!\n", sid_string_static(map->sid)));
+               /* ouch the domain is read only,
+                *  let's just leave it unmapped */
+               DEBUG(10, ("idmap backend for SID %s is READONLY!\n",
+                          sid_string_static(map->sid)));
                return NT_STATUS_UNSUCCESSFUL;
        }
 
@@ -811,79 +924,59 @@ static NTSTATUS idmap_new_mapping(TALLOC_CTX *ctx, struct id_map *map)
 {
        NTSTATUS ret;
        struct idmap_domain *dom;
-       char *domname, *name;
-       enum lsa_SidType sid_type;
-       BOOL wbret;
+
+       /* If we are offline we cannot lookup SIDs, deny mapping */
+       if (idmap_is_offline()) {
+               return NT_STATUS_FILE_IS_OFFLINE;
+       }
 
        ret = idmap_can_map(map, &dom);
        if ( ! NT_STATUS_IS_OK(ret)) {
                return NT_STATUS_NONE_MAPPED;
        }
 
-       /* quick hack to make things work, will need proper fix later on */     
-       if (idmap_is_in_own_child()) {
-               /* by default calls to winbindd are disabled
-                  the following call will not recurse so this is safe */
-               winbind_on();
-               wbret = winbind_lookup_sid(ctx, map->sid,
-                                               (const char **)&domname,
-                                               (const char **)&name,
-                                               &sid_type);
-               winbind_off();
-       } else {
-               wbret = winbindd_lookup_name_by_sid(ctx, map->sid,
-                                                       &domname,
-                                                       &name,
-                                                       &sid_type);
-       }
-
        /* check if this is a valid SID and then map it */
-       if (wbret) {
-               switch (sid_type) {
-               case SID_NAME_USER:
-                       ret = idmap_allocate_uid(&map->xid);
-                       if ( ! NT_STATUS_IS_OK(ret)) {
-                               /* can't allocate id, let's just leave it unmapped */
-                               DEBUG(2, ("uid allocation failed! Can't create mapping\n"));
-                               return NT_STATUS_NONE_MAPPED;
-                       }
-                       break;
-               case SID_NAME_DOM_GRP:
-               case SID_NAME_ALIAS:
-               case SID_NAME_WKN_GRP:
-                       ret = idmap_allocate_gid(&map->xid);
-                       if ( ! NT_STATUS_IS_OK(ret)) {
-                               /* can't allocate id, let's just leave it unmapped */
-                               DEBUG(2, ("gid allocation failed! Can't create mapping\n"));
-                               return NT_STATUS_NONE_MAPPED;
-                       }
-                       break;
-               default:
-                       /* invalid sid, let's just leave it unmapped */
-                       DEBUG(10, ("SID %s is UNKNOWN, skip mapping\n", sid_string_static(map->sid)));
+       switch (map->xid.type) {
+       case ID_TYPE_UID:
+               ret = idmap_allocate_uid(&map->xid);
+               if ( ! NT_STATUS_IS_OK(ret)) {
+                       /* can't allocate id, let's just leave it unmapped */
+                       DEBUG(2, ("uid allocation failed! "
+                                 "Can't create mapping\n"));
                        return NT_STATUS_NONE_MAPPED;
                }
+               break;
+       case ID_TYPE_GID:
+               ret = idmap_allocate_gid(&map->xid);
+               if ( ! NT_STATUS_IS_OK(ret)) {
+                       /* can't allocate id, let's just leave it unmapped */
+                       DEBUG(2, ("gid allocation failed! "
+                                 "Can't create mapping\n"));
+                       return NT_STATUS_NONE_MAPPED;
+               }
+               break;
+       default:
+               /* invalid sid, let's just leave it unmapped */
+               DEBUG(3,("idmap_new_mapping: Refusing to create a "
+                        "mapping for an unspecified ID type.\n"));
+               return NT_STATUS_NONE_MAPPED;
+       }
 
-               /* ok, got a new id, let's set a mapping */
-               map->status = ID_MAPPED;
+       /* ok, got a new id, let's set a mapping */
+       map->status = ID_MAPPED;
 
-               DEBUG(10, ("Setting mapping: %s <-> %s %lu\n",
-                          sid_string_static(map->sid),
-                          (map->xid.type == ID_TYPE_UID) ? "UID" : "GID",
-                          (unsigned long)map->xid.id));
-               ret = dom->methods->set_mapping(dom, map);
+       DEBUG(10, ("Setting mapping: %s <-> %s %lu\n",
+                  sid_string_static(map->sid),
+                  (map->xid.type == ID_TYPE_UID) ? "UID" : "GID",
+                  (unsigned long)map->xid.id));
+       ret = dom->methods->set_mapping(dom, map);
 
-               if ( ! NT_STATUS_IS_OK(ret)) {
-                       /* something wrong here :-( */
-                       DEBUG(2, ("Failed to commit mapping\n!"));
+       if ( ! NT_STATUS_IS_OK(ret)) {
+               /* something wrong here :-( */
+               DEBUG(2, ("Failed to commit mapping\n!"));
 
-                       /* TODO: would it make sense to have an "unalloc_id function?" */
+       /* TODO: would it make sense to have an "unalloc_id function?" */
 
-                       return NT_STATUS_NONE_MAPPED;
-               }
-       } else {
-               DEBUG(2,("Invalid SID, not mapping %s (type %d)\n",
-                               sid_string_static(map->sid), sid_type));
                return NT_STATUS_NONE_MAPPED;
        }
 
@@ -905,7 +998,7 @@ static NTSTATUS idmap_backends_set_mapping(const struct id_map *map)
                return ret;
        }
 
-       DEBUG(10,("set_mapping for domain %s\n", dom->name ));  
+       DEBUG(10,("set_mapping for domain %s\n", dom->name ));
 
        return dom->methods->set_mapping(dom, map);
 }
@@ -937,26 +1030,22 @@ static NTSTATUS idmap_backends_unixids_to_sids(struct id_map **ids)
 
        _ids = ids;
 
-       /* make sure all maps are marked as in UNKNOWN status */
-       for (i = 0; _ids[i]; i++) {
-               _ids[i]->status = ID_UNKNOWN;
-       }
-
        unmapped = NULL;
        for (n = num_domains-1; n >= 0; n--) { /* cycle backwards */
 
                dom = idmap_domains[n];
 
                DEBUG(10, ("Query sids from domain %s\n", dom->name));
-               
+
                ret = dom->methods->unixids_to_sids(dom, _ids);
-               IDMAP_CHECK_RET(ret);
+               IDMAP_REPORT_RET(ret);
 
                unmapped = NULL;
 
                for (i = 0, u = 0; _ids[i]; i++) {
-                       if (_ids[i]->status == ID_UNKNOWN || _ids[i]->status == ID_UNMAPPED) {
-                               unmapped = talloc_realloc(ctx, unmapped, struct id_map *, u + 2);
+                       if (_ids[i]->status != ID_MAPPED) {
+                               unmapped = talloc_realloc(ctx, unmapped,
+                                                       struct id_map *, u + 2);
                                IDMAP_CHECK_ALLOC(unmapped);
                                unmapped[u] = _ids[i];
                                u++;
@@ -970,19 +1059,27 @@ static NTSTATUS idmap_backends_unixids_to_sids(struct id_map **ids)
                }
 
                _ids = unmapped;
-               
+
        }
 
        if (unmapped) {
-               /* there are still unmapped ids, map them to the unix users/groups domains */
+               /* there are still unmapped ids,
+                * map them to the unix users/groups domains */
+               /* except for expired entries,
+                * these will be returned as valid (offline mode) */
                for (i = 0; unmapped[i]; i++) {
+                       if (unmapped[i]->status == ID_EXPIRED) continue;
                        switch (unmapped[i]->xid.type) {
                        case ID_TYPE_UID:
-                               uid_to_unix_users_sid((uid_t)unmapped[i]->xid.id, unmapped[i]->sid);
+                               uid_to_unix_users_sid(
+                                               (uid_t)unmapped[i]->xid.id,
+                                               unmapped[i]->sid);
                                unmapped[i]->status = ID_MAPPED;
                                break;
                        case ID_TYPE_GID:
-                               gid_to_unix_groups_sid((gid_t)unmapped[i]->xid.id, unmapped[i]->sid);
+                               gid_to_unix_groups_sid(
+                                               (gid_t)unmapped[i]->xid.id,
+                                               unmapped[i]->sid);
                                unmapped[i]->status = ID_MAPPED;
                                break;
                        default: /* what?! */
@@ -997,7 +1094,7 @@ static NTSTATUS idmap_backends_unixids_to_sids(struct id_map **ids)
 done:
        talloc_free(ctx);
        return ret;
-}      
+}
 
 static NTSTATUS idmap_backends_sids_to_unixids(struct id_map **ids)
 {
@@ -1015,33 +1112,36 @@ static NTSTATUS idmap_backends_sids_to_unixids(struct id_map **ids)
        DEBUG(10, ("Query backends to map sids->ids\n"));
 
        /* split list per domain */
+       if (num_domains == 0) {
+               DEBUG(1, ("No domains available?\n"));
+               return NT_STATUS_UNSUCCESSFUL;
+       }
 
-       dom_ids = talloc_zero_array(ctx, struct id_map **, num_domains);
+       dom_ids = TALLOC_ZERO_ARRAY(ctx, struct id_map **, num_domains);
        IDMAP_CHECK_ALLOC(dom_ids);
-       counters = talloc_zero_array(ctx, int, num_domains);
+       counters = TALLOC_ZERO_ARRAY(ctx, int, num_domains);
+       IDMAP_CHECK_ALLOC(counters);
 
        /* partition the requests by domain */
 
        for (i = 0; ids[i]; i++) {
-               uint32 idx;             
-
-               /* make sure they are unknown to start off */
-               ids[i]->status = ID_UNKNOWN;
+               uint32 idx;
 
-               if ( (dom = find_idmap_domain_from_sid( ids[i]->sid )) == NULL ) {
-                       /* no vailable idmap_domain.  Move on */
+               if ((dom = find_idmap_domain_from_sid(ids[i]->sid)) == NULL) {
+                       /* no available idmap_domain.  Move on */
                        continue;
                }
 
-               DEBUG(10,("SID %s is being handled by %s\n", 
-                         sid_string_static(ids[i]->sid),  
+               DEBUG(10,("SID %s is being handled by %s\n",
+                         sid_string_static(ids[i]->sid),
                          dom ? dom->name : "none" ));
 
                idx = find_idmap_domain_index( dom );
                SMB_ASSERT( idx != -1 );
-               
-               dom_ids[idx] = talloc_realloc(ctx, dom_ids[idx], 
-                                             struct id_map *, counters[idx] + 2);
+
+               dom_ids[idx] = talloc_realloc(ctx, dom_ids[idx],
+                                             struct id_map *,
+                                             counters[idx] + 2);
                IDMAP_CHECK_ALLOC(dom_ids[idx]);
 
                dom_ids[idx][counters[idx]] = ids[i];
@@ -1057,7 +1157,7 @@ static NTSTATUS idmap_backends_sids_to_unixids(struct id_map **ids)
                        dom = idmap_domains[i];
                        DEBUG(10, ("Query ids from domain %s\n", dom->name));
                        ret = dom->methods->sids_to_unixids(dom, dom_ids[i]);
-                       IDMAP_CHECK_RET(ret);
+                       IDMAP_REPORT_RET(ret);
                }
        }
 
@@ -1065,17 +1165,22 @@ static NTSTATUS idmap_backends_sids_to_unixids(struct id_map **ids)
        /* let's see if we have any unmapped SID left and act accordingly */
 
        for (i = 0; ids[i]; i++) {
-               if (ids[i]->status == ID_UNKNOWN || ids[i]->status == ID_UNMAPPED) {
+               /* NOTE: this will NOT touch ID_EXPIRED entries that the backend
+                * was not able to confirm/deny (offline mode) */
+               if (ids[i]->status == ID_UNKNOWN ||
+                       ids[i]->status == ID_UNMAPPED) {
                        /* ok this is an unmapped one, see if we can map it */
                        ret = idmap_new_mapping(ctx, ids[i]);
                        if (NT_STATUS_IS_OK(ret)) {
                                /* successfully mapped */
                                ids[i]->status = ID_MAPPED;
-                       } else if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
+                       } else
+                       if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
                                /* could not map it */
                                ids[i]->status = ID_UNMAPPED;
                        } else {
-                               /* Something very bad happened down there */
+                               /* Something very bad happened down there
+                                * OR we are offline */
                                ids[i]->status = ID_UNKNOWN;
                        }
                }
@@ -1086,7 +1191,7 @@ static NTSTATUS idmap_backends_sids_to_unixids(struct id_map **ids)
 done:
        talloc_free(ctx);
        return ret;
-}      
+}
 
 /**************************************************************************
  idmap interface functions
@@ -1099,6 +1204,7 @@ NTSTATUS idmap_unixids_to_sids(struct id_map **ids)
        struct id_map **bids;
        int i, bi;
        int bn = 0;
+       struct winbindd_domain *our_domain = find_our_domain();
 
        if (! NT_STATUS_IS_OK(ret = idmap_init())) {
                return ret;
@@ -1118,7 +1224,7 @@ NTSTATUS idmap_unixids_to_sids(struct id_map **ids)
        /* no ids to be asked to the backends by default */
        bids = NULL;
        bi = 0;
-       
+
        for (i = 0; ids[i]; i++) {
 
                if ( ! ids[i]->sid) {
@@ -1132,8 +1238,9 @@ NTSTATUS idmap_unixids_to_sids(struct id_map **ids)
                if ( ! NT_STATUS_IS_OK(ret)) {
 
                        if ( ! bids) {
-                               /* alloc space for ids to be resolved by backends (realloc ten by ten) */
-                               bids = talloc_array(ctx, struct id_map *, 10);
+                               /* alloc space for ids to be resolved by
+                                * backends (realloc ten by ten) */
+                               bids = TALLOC_ARRAY(ctx, struct id_map *, 10);
                                if ( ! bids) {
                                        DEBUG(1, ("Out of memory!\n"));
                                        talloc_free(ctx);
@@ -1142,14 +1249,17 @@ NTSTATUS idmap_unixids_to_sids(struct id_map **ids)
                                bn = 10;
                        }
 
-                       /* add this id to the ones to be retrieved from the backends */
+                       /* add this id to the ones to be retrieved
+                        * from the backends */
                        bids[bi] = ids[i];
                        bi++;
-       
-                       /* check if we need to allocate new space on the rids array */
+
+                       /* check if we need to allocate new space
+                        *  on the rids array */
                        if (bi == bn) {
                                bn += 10;
-                               bids = talloc_realloc(ctx, bids, struct id_map *, bn);
+                               bids = talloc_realloc(ctx, bids,
+                                                     struct id_map *, bn);
                                if ( ! bids) {
                                        DEBUG(1, ("Out of memory!\n"));
                                        talloc_free(ctx);
@@ -1162,12 +1272,11 @@ NTSTATUS idmap_unixids_to_sids(struct id_map **ids)
                }
        }
 
-       /* let's see if there is any id mapping to be retieved from the backends */
+       /* let's see if there is any id mapping to be retieved
+        * from the backends */
        if (bi) {
                /* Only do query if we are online */
-               if ( lp_winbind_offline_logon() &&
-                    get_global_winbindd_state_offline() )
-               {
+               if ( IS_DOMAIN_OFFLINE(our_domain) ) {
                        ret = NT_STATUS_FILE_IS_OFFLINE;
                        goto done;
                }
@@ -1179,13 +1288,22 @@ NTSTATUS idmap_unixids_to_sids(struct id_map **ids)
                for (i = 0; i < bi; i++) {
                        if (bids[i]->status == ID_MAPPED) {
                                ret = idmap_cache_set(idmap_cache, bids[i]);
+                       } else if (bids[i]->status == ID_EXPIRED) {
+                               /* the cache returned an expired entry and the
+                                * backend was not able to clear the situation
+                                * (offline). This handles a previous
+                                * NT_STATUS_SYNCHRONIZATION_REQUIRED
+                                * for disconnected mode, */
+                               bids[i]->status = ID_MAPPED;
                        } else if (bids[i]->status == ID_UNKNOWN) {
-                               /* return an expired entry in the cache or an unknown */
-                               /* this handles a previous NT_STATUS_SYNCHRONIZATION_REQUIRED
-                                * for disconnected mode */
-                               idmap_cache_map_id(idmap_cache, ids[i]);
+                               /* something bad here. We were not able to
+                                * handle this for some reason, mark it as
+                                * unmapped and hope next time things will
+                                * settle down. */
+                               bids[i]->status = ID_UNMAPPED;
                        } else { /* unmapped */
-                               ret = idmap_cache_set_negative_id(idmap_cache, bids[i]);
+                               ret = idmap_cache_set_negative_id(idmap_cache,
+                                                                 bids[i]);
                        }
                        IDMAP_CHECK_RET(ret);
                }
@@ -1204,6 +1322,7 @@ NTSTATUS idmap_sids_to_unixids(struct id_map **ids)
        struct id_map **bids;
        int i, bi;
        int bn = 0;
+       struct winbindd_domain *our_domain = find_our_domain();
 
        if (! NT_STATUS_IS_OK(ret = idmap_init())) {
                return ret;
@@ -1223,7 +1342,7 @@ NTSTATUS idmap_sids_to_unixids(struct id_map **ids)
        /* no ids to be asked to the backends by default */
        bids = NULL;
        bi = 0;
-       
+
        for (i = 0; ids[i]; i++) {
 
                if ( ! ids[i]->sid) {
@@ -1239,7 +1358,7 @@ NTSTATUS idmap_sids_to_unixids(struct id_map **ids)
                        if ( ! bids) {
                                /* alloc space for ids to be resolved
                                   by backends (realloc ten by ten) */
-                               bids = talloc_array(ctx, struct id_map *, 10);
+                               bids = TALLOC_ARRAY(ctx, struct id_map *, 10);
                                if ( ! bids) {
                                        DEBUG(1, ("Out of memory!\n"));
                                        talloc_free(ctx);
@@ -1248,14 +1367,17 @@ NTSTATUS idmap_sids_to_unixids(struct id_map **ids)
                                bn = 10;
                        }
 
-                       /* add this id to the ones to be retrieved from the backends */
+                       /* add this id to the ones to be retrieved
+                        * from the backends */
                        bids[bi] = ids[i];
                        bi++;
 
-                       /* check if we need to allocate new space on the ids array */
+                       /* check if we need to allocate new space
+                        * on the ids array */
                        if (bi == bn) {
                                bn += 10;
-                               bids = talloc_realloc(ctx, bids, struct id_map *, bn);
+                               bids = talloc_realloc(ctx, bids,
+                                                     struct id_map *, bn);
                                if ( ! bids) {
                                        DEBUG(1, ("Out of memory!\n"));
                                        talloc_free(ctx);
@@ -1268,16 +1390,15 @@ NTSTATUS idmap_sids_to_unixids(struct id_map **ids)
                }
        }
 
-       /* let's see if there is any id mapping to be retieved from the backends */
+       /* let's see if there is any id mapping to be retieved
+        * from the backends */
        if (bids) {
                /* Only do query if we are online */
-               if ( lp_winbind_offline_logon() &&
-                    get_global_winbindd_state_offline() )
-               {
+               if ( IS_DOMAIN_OFFLINE(our_domain) ) {
                        ret = NT_STATUS_FILE_IS_OFFLINE;
                        goto done;
                }
-               
+
                ret = idmap_backends_sids_to_unixids(bids);
                IDMAP_CHECK_RET(ret);
 
@@ -1285,13 +1406,22 @@ NTSTATUS idmap_sids_to_unixids(struct id_map **ids)
                for (i = 0; bids[i]; i++) {
                        if (bids[i]->status == ID_MAPPED) {
                                ret = idmap_cache_set(idmap_cache, bids[i]);
+                       } else if (bids[i]->status == ID_EXPIRED) {
+                               /* the cache returned an expired entry and the
+                                * backend was not able to clear the situation
+                                * (offline). This handles a previous
+                                * NT_STATUS_SYNCHRONIZATION_REQUIRED
+                                * for disconnected mode, */
+                               bids[i]->status = ID_MAPPED;
                        } else if (bids[i]->status == ID_UNKNOWN) {
-                               /* return an expired entry in the cache or an unknown */
-                               /* this handles a previous NT_STATUS_SYNCHRONIZATION_REQUIRED
-                                * for disconnected mode */
-                               idmap_cache_map_id(idmap_cache, ids[i]);
-                       } else {
-                               ret = idmap_cache_set_negative_sid(idmap_cache, bids[i]);
+                               /* something bad here. We were not able to
+                                * handle this for some reason, mark it as
+                                * unmapped and hope next time things will
+                                * settle down. */
+                               bids[i]->status = ID_UNMAPPED;
+                       } else { /* unmapped */
+                               ret = idmap_cache_set_negative_sid(idmap_cache,
+                                                                  bids[i]);
                        }
                        IDMAP_CHECK_RET(ret);
                }
@@ -1358,28 +1488,30 @@ void idmap_dump_maps(char *logfile)
 
        dump = fopen(logfile, "w");
        if ( ! dump) {
-               DEBUG(0, ("Unable to open open stream for file [%s], errno: %d\n", logfile, errno));
+               DEBUG(0, ("Unable to open open stream for file [%s], "
+                         "errno: %d\n", logfile, errno));
                return;
        }
 
-       if ( alloc_methods ) {          
+       if (NT_STATUS_IS_OK(ret = idmap_alloc_init())) {
                allid.type = ID_TYPE_UID;
                allid.id = 0;
-               alloc_methods->get_id_hwm(&allid);
+               idmap_alloc_ctx->methods->get_id_hwm(&allid);
                fprintf(dump, "USER HWM %lu\n", (unsigned long)allid.id);
-               
+
                allid.type = ID_TYPE_GID;
                allid.id = 0;
-               alloc_methods->get_id_hwm(&allid);
+               idmap_alloc_ctx->methods->get_id_hwm(&allid);
                fprintf(dump, "GROUP HWM %lu\n", (unsigned long)allid.id);
        }
-       
+
        maps = talloc(idmap_ctx, struct id_map);
        num_maps = 0;
 
        for (i = 0; i < num_domains; i++) {
                if (idmap_domains[i]->methods->dump_data) {
-                       idmap_domains[i]->methods->dump_data(idmap_domains[i], &maps, &num_maps);
+                       idmap_domains[i]->methods->dump_data(idmap_domains[i],
+                                                            &maps, &num_maps);
                }
        }
 
@@ -1395,6 +1527,8 @@ void idmap_dump_maps(char *logfile)
                                (unsigned long)maps[i].xid.id,
                                sid_string_static(maps[i].sid));
                        break;
+               case ID_TYPE_NOT_SPECIFIED:
+                       break;
                }
        }
 
@@ -1414,13 +1548,13 @@ char *idmap_fetch_secret(const char *backend, bool alloc,
                r = asprintf(&tmp, "IDMAP_%s_%s", backend, domain);
        }
 
-       if (r < 0) 
+       if (r < 0)
                return NULL;
 
        strupper_m(tmp); /* make sure the key is case insensitive */
        ret = secrets_fetch_generic(tmp, identity);
 
-       SAFE_FREE( tmp );       
+       SAFE_FREE(tmp);
 
        return ret;
 }