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 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 #include "lib/util/dlinklist.h"
  25 #include "rpc_server/dcerpc_server.h"
  26
  27 /*
  28   destroy a rpc handle
  29 */
  30 static int dcesrv_handle_destructor(struct dcesrv_handle *h)
  31 {
  32         DLIST_REMOVE(h->context->handles, h);
  33         talloc_free(h);
  34         return 0;
  35 }
  36
  37
  38 /*
  39   allocate a new rpc handle
  40 */
  41 _PUBLIC_ struct dcesrv_handle *dcesrv_handle_new(struct dcesrv_connection_context *context,
  42                                         uint8_t handle_type)
  43 {
  44         struct dcesrv_handle *h;
  45
  46         h = talloc(context, struct dcesrv_handle);
  47         if (!h) {
  48                 return NULL;
  49         }
  50         h->data = NULL;
  51         h->context = context;
  52
  53         h->wire_handle.handle_type = handle_type;
  54         h->wire_handle.uuid = GUID_random();
  55
  56         DLIST_ADD(context->handles, h);
  57
  58         talloc_set_destructor(h, dcesrv_handle_destructor);
  59
  60         return h;
  61 }
  62
  63 /*
  64   find an internal handle given a wire handle. If the wire handle is NULL then
  65   allocate a new handle
  66 */
  67 _PUBLIC_ struct dcesrv_handle *dcesrv_handle_fetch(struct dcesrv_connection_context *context,
  68                                           struct policy_handle *p,
  69                                           uint8_t handle_type)
  70 {
  71         struct dcesrv_handle *h;
  72
  73         if (policy_handle_empty(p)) {
  74                 return dcesrv_handle_new(context, handle_type);
  75         }
  76
  77         for (h=context->handles; h; h=h->next) {
  78                 if (h->wire_handle.handle_type == p->handle_type &&
  79                     GUID_equal(&p->uuid, &h->wire_handle.uuid)) {
  80                         if (handle_type != DCESRV_HANDLE_ANY &&
  81                             p->handle_type != handle_type) {
  82                                 DEBUG(0,("client gave us the wrong handle type (%d should be %d)\n",
  83                                          p->handle_type, handle_type));
  84                                 return NULL;
  85                         }
  86                         return h;
  87                 }
  88         }
  89
  90         return NULL;
  91 }