source4/ntvfs/ntvfs_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NTVFS utility code
   4    Copyright (C) Stefan Metzmacher 2004
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19 /*
  20   this implements common utility functions that many NTVFS backends may wish to use
  21 */
  22
  23 #include "includes.h"
  24 #include "../lib/util/dlinklist.h"
  25 #include "ntvfs/ntvfs.h"
  26
  27
  28 struct ntvfs_request *ntvfs_request_create(struct ntvfs_context *ctx, TALLOC_CTX *mem_ctx,
  29                                                     struct auth_session_info *session_info,
  30                                                     uint16_t smbpid,
  31                                                     struct timeval request_time,
  32                                                     void *private_data,
  33                                                     void (*send_fn)(struct ntvfs_request *),
  34                                                     uint32_t state)
  35 {
  36         struct ntvfs_request *req;
  37         struct ntvfs_async_state *async;
  38
  39         req = talloc(mem_ctx, struct ntvfs_request);
  40         if (!req) return NULL;
  41         req->ctx                        = ctx;
  42         req->async_states               = NULL;
  43         req->session_info               = session_info;
  44         req->smbpid                     = smbpid;
  45         req->client_caps                = ctx->client_caps;
  46         req->statistics.request_time    = request_time;
  47
  48         async = talloc(req, struct ntvfs_async_state);
  49         if (!async) goto failed;
  50
  51         async->state            = state;
  52         async->private_data     = private_data;
  53         async->send_fn          = send_fn;
  54         async->status           = NT_STATUS_INTERNAL_ERROR;
  55         async->ntvfs            = NULL;
  56
  57         DLIST_ADD(req->async_states, async);
  58
  59         return req;
  60 failed:
  61         talloc_free(req);
  62         return NULL;
  63 }
  64
  65 NTSTATUS ntvfs_async_state_push(struct ntvfs_module_context *ntvfs,
  66                                          struct ntvfs_request *req,
  67                                          void *private_data,
  68                                          void (*send_fn)(struct ntvfs_request *))
  69 {
  70         struct ntvfs_async_state *async;
  71
  72         async = talloc(req, struct ntvfs_async_state);
  73         NT_STATUS_HAVE_NO_MEMORY(async);
  74
  75         async->state            = req->async_states->state;
  76         async->private_data     = private_data;
  77         async->send_fn          = send_fn;
  78         async->status           = NT_STATUS_INTERNAL_ERROR;
  79
  80         async->ntvfs            = ntvfs;
  81
  82         DLIST_ADD(req->async_states, async);
  83
  84         return NT_STATUS_OK;
  85 }
  86
  87 void ntvfs_async_state_pop(struct ntvfs_request *req)
  88 {
  89         struct ntvfs_async_state *async;
  90
  91         async = req->async_states;
  92
  93         DLIST_REMOVE(req->async_states, async);
  94
  95         req->async_states->state        = async->state;
  96         req->async_states->status       = async->status;
  97
  98         talloc_free(async);
  99 }
 100
 101 NTSTATUS ntvfs_handle_new(struct ntvfs_module_context *ntvfs,
 102                                    struct ntvfs_request *req,
 103                                    struct ntvfs_handle **h)
 104 {
 105         if (!ntvfs->ctx->handles.create_new) {
 106                 return NT_STATUS_NOT_IMPLEMENTED;
 107         }
 108         return ntvfs->ctx->handles.create_new(ntvfs->ctx->handles.private_data, req, h);
 109 }
 110
 111 NTSTATUS ntvfs_handle_set_backend_data(struct ntvfs_handle *h,
 112                                                 struct ntvfs_module_context *ntvfs,
 113                                                 TALLOC_CTX *private_data)
 114 {
 115         struct ntvfs_handle_data *d;
 116         bool first_time = h->backend_data?false:true;
 117
 118         for (d=h->backend_data; d; d = d->next) {
 119                 if (d->owner != ntvfs) continue;
 120                 d->private_data = talloc_steal(d, private_data);
 121                 return NT_STATUS_OK;
 122         }
 123
 124         d = talloc(h, struct ntvfs_handle_data);
 125         NT_STATUS_HAVE_NO_MEMORY(d);
 126         d->owner = ntvfs;
 127         d->private_data = talloc_steal(d, private_data);
 128
 129         DLIST_ADD(h->backend_data, d);
 130
 131         if (first_time) {
 132                 NTSTATUS status;
 133                 status = h->ctx->handles.make_valid(h->ctx->handles.private_data, h);
 134                 NT_STATUS_NOT_OK_RETURN(status);
 135         }
 136
 137         return NT_STATUS_OK;
 138 }
 139
 140 void *ntvfs_handle_get_backend_data(struct ntvfs_handle *h,
 141                                              struct ntvfs_module_context *ntvfs)
 142 {
 143         struct ntvfs_handle_data *d;
 144
 145         for (d=h->backend_data; d; d = d->next) {
 146                 if (d->owner != ntvfs) continue;
 147                 return d->private_data;
 148         }
 149
 150         return NULL;
 151 }
 152
 153 void ntvfs_handle_remove_backend_data(struct ntvfs_handle *h,
 154                                                struct ntvfs_module_context *ntvfs)
 155 {
 156         struct ntvfs_handle_data *d,*n;
 157
 158         for (d=h->backend_data; d; d = n) {
 159                 n = d->next;
 160                 if (d->owner != ntvfs) continue;
 161                 DLIST_REMOVE(h->backend_data, d);
 162                 talloc_free(d);
 163                 d = NULL;
 164         }
 165
 166         if (h->backend_data) return;
 167
 168         /* if there's no backend_data anymore, destroy the handle */
 169         h->ctx->handles.destroy(h->ctx->handles.private_data, h);
 170 }
 171
 172 struct ntvfs_handle *ntvfs_handle_search_by_wire_key(struct ntvfs_module_context *ntvfs,
 173                                                               struct ntvfs_request *req,
 174                                                               const DATA_BLOB *key)
 175 {
 176         if (!ntvfs->ctx->handles.search_by_wire_key) {
 177                 return NULL;
 178         }
 179         return ntvfs->ctx->handles.search_by_wire_key(ntvfs->ctx->handles.private_data, req, key);
 180 }
 181
 182 DATA_BLOB ntvfs_handle_get_wire_key(struct ntvfs_handle *h, TALLOC_CTX *mem_ctx)
 183 {
 184         return h->ctx->handles.get_wire_key(h->ctx->handles.private_data, h, mem_ctx);
 185 }
 186
 187 NTSTATUS ntvfs_set_handle_callbacks(struct ntvfs_context *ntvfs,
 188                                              NTSTATUS (*create_new)(void *private_data, struct ntvfs_request *req, struct ntvfs_handle **h),
 189                                              NTSTATUS (*make_valid)(void *private_data, struct ntvfs_handle *h),
 190                                              void (*destroy)(void *private_data, struct ntvfs_handle *h),
 191                                              struct ntvfs_handle *(*search_by_wire_key)(void *private_data, struct ntvfs_request *req, const DATA_BLOB *key),
 192                                              DATA_BLOB (*get_wire_key)(void *private_data, struct ntvfs_handle *handle, TALLOC_CTX *mem_ctx),
 193                                              void *private_data)
 194 {
 195         ntvfs->handles.create_new               = create_new;
 196         ntvfs->handles.make_valid               = make_valid;
 197         ntvfs->handles.destroy                  = destroy;
 198         ntvfs->handles.search_by_wire_key       = search_by_wire_key;
 199         ntvfs->handles.get_wire_key             = get_wire_key;
 200         ntvfs->handles.private_data             = private_data;
 201         return NT_STATUS_OK;
 202 }