source4/rpc_server/handles.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    server side dcerpc handle code
   5
   6    Copyright (C) Andrew Tridgell 2003
   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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "../lib/util/dlinklist.h"
  24 #include "rpc_server/dcerpc_server.h"
  25
  26 /*
  27   destroy a rpc handle
  28 */
  29 static int dcesrv_handle_destructor(struct dcesrv_handle *h)
  30 {
  31         DLIST_REMOVE(h->context->handles, h);
  32         return 0;
  33 }
  34
  35
  36 /*
  37   allocate a new rpc handle
  38 */
  39 _PUBLIC_ struct dcesrv_handle *dcesrv_handle_new(struct dcesrv_connection_context *context,
  40                                         uint8_t handle_type)
  41 {
  42         struct dcesrv_handle *h;
  43
  44         h = talloc(context, struct dcesrv_handle);
  45         if (!h) {
  46                 return NULL;
  47         }
  48         h->data = NULL;
  49         h->context = context;
  50
  51         h->wire_handle.handle_type = handle_type;
  52         h->wire_handle.uuid = GUID_random();
  53
  54         DLIST_ADD(context->handles, h);
  55
  56         talloc_set_destructor(h, dcesrv_handle_destructor);
  57
  58         return h;
  59 }
  60
  61 /**
  62   find an internal handle given a wire handle. If the wire handle is NULL then
  63   allocate a new handle
  64 */
  65 _PUBLIC_ struct dcesrv_handle *dcesrv_handle_fetch(
  66                                           struct dcesrv_connection_context *context,
  67                                           struct policy_handle *p,
  68                                           uint8_t handle_type)
  69 {
  70         struct dcesrv_handle *h;
  71
  72         if (policy_handle_empty(p)) {
  73                 return dcesrv_handle_new(context, handle_type);
  74         }
  75
  76         for (h=context->handles; h; h=h->next) {
  77                 if (h->wire_handle.handle_type == p->handle_type &&
  78                     GUID_equal(&p->uuid, &h->wire_handle.uuid)) {
  79                         if (handle_type != DCESRV_HANDLE_ANY &&
  80                             p->handle_type != handle_type) {
  81                                 DEBUG(0,("client gave us the wrong handle type (%d should be %d)\n",
  82                                          p->handle_type, handle_type));
  83                                 return NULL;
  84                         }
  85                         return h;
  86                 }
  87         }
  88
  89         return NULL;
  90 }