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 "rpc_server/dcerpc_server.h"
  24 #include "messaging/irpc.h"
  25
  26 struct dcesrv_forward_state {
  27         const char *opname;
  28         struct dcesrv_call_state *dce_call;
  29 };
  30
  31 /*
  32   called when the forwarded rpc request is finished
  33  */
  34 static void dcesrv_irpc_forward_callback(struct irpc_request *ireq)
  35 {
  36         struct dcesrv_forward_state *st = talloc_get_type(ireq->async.private_data,
  37                                                           struct dcesrv_forward_state);
  38         const char *opname = st->opname;
  39         NTSTATUS status;
  40         if (!NT_STATUS_IS_OK(ireq->status)) {
  41                 DEBUG(0,("IRPC callback failed for %s - %s\n",
  42                          opname, nt_errstr(ireq->status)));
  43                 st->dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
  44         }
  45         talloc_free(ireq);
  46         status = dcesrv_reply(st->dce_call);
  47         if (!NT_STATUS_IS_OK(status)) {
  48                 DEBUG(0,("%s_handler: dcesrv_reply() failed - %s\n",
  49                          opname, nt_errstr(status)));
  50         }
  51 }
  52
  53
  54
  55 /*
  56   forward a RPC call using IRPC to another task
  57  */
  58 void dcesrv_irpc_forward_rpc_call(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
  59                                   void *r, uint32_t callid,
  60                                   const struct ndr_interface_table *ndr_table,
  61                                   const char *dest_task, const char *opname)
  62 {
  63         struct server_id *sid;
  64         struct irpc_request *ireq;
  65         struct dcesrv_forward_state *st;
  66
  67         st = talloc(mem_ctx, struct dcesrv_forward_state);
  68         if (st == NULL) {
  69                 dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
  70                 return;
  71         }
  72
  73         st->dce_call = dce_call;
  74         st->opname   = opname;
  75
  76         /* if the caller has said they can't support async calls
  77            then fail the call */
  78         if (!(dce_call->state_flags & DCESRV_CALL_STATE_FLAG_MAY_ASYNC)) {
  79                 /* we're not allowed to reply async */
  80                 DEBUG(0,("%s: Not available synchronously\n", dest_task));
  81                 dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
  82                 return;
  83         }
  84
  85         /* find the server task */
  86         sid = irpc_servers_byname(dce_call->msg_ctx, mem_ctx, dest_task);
  87         if (sid == NULL || sid[0].id == 0) {
  88                 DEBUG(0,("%s: Unable to find %s task\n", dest_task, opname));
  89                 dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
  90                 return;
  91         }
  92
  93         /* forward the call */
  94         ireq = irpc_call_send(dce_call->msg_ctx, sid[0], ndr_table, callid, r, mem_ctx);
  95         if (ireq == NULL) {
  96                 DEBUG(0,("%s: Failed to forward request to %s task\n",
  97                          opname, dest_task));
  98                 dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
  99                 return;
 100         }
 101
 102         /* mark the request as replied async */
 103         dce_call->state_flags |= DCESRV_CALL_STATE_FLAG_ASYNC;
 104
 105         /* setup the callback */
 106         ireq->async.fn = dcesrv_irpc_forward_callback;
 107         ireq->async.private_data = st;
 108 }