source4/rpc_server/common/forward.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    forwarding of RPC calls to other tasks
   5
   6    Copyright (C) Andrew Tridgell 2009
   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 <tevent.h>
  24 #include "rpc_server/dcerpc_server.h"
  25 #include "librpc/gen_ndr/dcerpc.h"
  26 #include "rpc_server/common/common.h"
  27 #include "messaging/irpc.h"
  28 #include "auth/auth.h"
  29
  30
  31 struct dcesrv_forward_state {
  32         const char *opname;
  33         struct dcesrv_call_state *dce_call;
  34 };
  35
  36 /*
  37   called when the forwarded rpc request is finished
  38  */
  39 static void dcesrv_irpc_forward_callback(struct tevent_req *subreq)
  40 {
  41         struct dcesrv_forward_state *st =
  42                 tevent_req_callback_data(subreq,
  43                 struct dcesrv_forward_state);
  44         const char *opname = st->opname;
  45         NTSTATUS status;
  46
  47         status = dcerpc_binding_handle_call_recv(subreq);
  48         TALLOC_FREE(subreq);
  49         if (!NT_STATUS_IS_OK(status)) {
  50                 DEBUG(0,("IRPC callback failed for %s - %s\n",
  51                          opname, nt_errstr(status)));
  52                 st->dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
  53         }
  54         _dcesrv_async_reply(st->dce_call, __func__, opname);
  55 }
  56
  57
  58
  59 /**
  60  * Forward a RPC call using IRPC to another task
  61  */
  62 void dcesrv_irpc_forward_rpc_call(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
  63                                   void *r, uint32_t callid,
  64                                   const struct ndr_interface_table *ndr_table,
  65                                   const char *dest_task, const char *opname,
  66                                   uint32_t timeout)
  67 {
  68         struct dcesrv_forward_state *st;
  69         struct dcerpc_binding_handle *binding_handle;
  70         struct tevent_req *subreq;
  71         struct auth_session_info *session_info =
  72                 dcesrv_call_session_info(dce_call);
  73         struct imessaging_context *imsg_ctx =
  74                 dcesrv_imessaging_context(dce_call->conn);
  75
  76         st = talloc(mem_ctx, struct dcesrv_forward_state);
  77         if (st == NULL) {
  78                 dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
  79                 return;
  80         }
  81
  82         st->dce_call = dce_call;
  83         st->opname   = opname;
  84
  85         /* if the caller has said they can't support async calls
  86            then fail the call */
  87         if (!(dce_call->state_flags & DCESRV_CALL_STATE_FLAG_MAY_ASYNC)) {
  88                 /* we're not allowed to reply async */
  89                 DEBUG(0,("%s: Not available synchronously\n", dest_task));
  90                 dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
  91                 return;
  92         }
  93
  94         binding_handle = irpc_binding_handle_by_name(st,
  95                                                      imsg_ctx,
  96                                                      dest_task,
  97                                                      ndr_table);
  98         if (binding_handle == NULL) {
  99                 DEBUG(0,("%s: Failed to forward request to %s task\n",
 100                          opname, dest_task));
 101                 dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
 102                 return;
 103         }
 104
 105         /* reset timeout for the handle */
 106         dcerpc_binding_handle_set_timeout(binding_handle, timeout);
 107
 108         /* add security token to the handle*/
 109         irpc_binding_handle_add_security_token(binding_handle,
 110                                                session_info->security_token);
 111
 112         /* forward the call */
 113         subreq = dcerpc_binding_handle_call_send(st, dce_call->event_ctx,
 114                                                  binding_handle,
 115                                                  NULL, ndr_table,
 116                                                  callid,
 117                                                  dce_call, r);
 118         if (subreq == NULL) {
 119                 DEBUG(0,("%s: Failed to forward request to %s task\n",
 120                          opname, dest_task));
 121                 dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
 122                 return;
 123         }
 124
 125         /* mark the request as replied async */
 126         dce_call->state_flags |= DCESRV_CALL_STATE_FLAG_ASYNC;
 127
 128         /* setup the callback */
 129         tevent_req_set_callback(subreq, dcesrv_irpc_forward_callback, st);
 130 }