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         status = dcesrv_reply(st->dce_call);
  55         if (!NT_STATUS_IS_OK(status)) {
  56                 DEBUG(0,("%s_handler: dcesrv_reply() failed - %s\n",
  57                          opname, nt_errstr(status)));
  58         }
  59 }
  60
  61
  62
  63 /**
  64  * Forward a RPC call using IRPC to another task
  65  */
  66 void dcesrv_irpc_forward_rpc_call(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
  67                                   void *r, uint32_t callid,
  68                                   const struct ndr_interface_table *ndr_table,
  69                                   const char *dest_task, const char *opname,
  70                                   uint32_t timeout)
  71 {
  72         struct dcesrv_forward_state *st;
  73         struct dcerpc_binding_handle *binding_handle;
  74         struct tevent_req *subreq;
  75         struct security_token *token;
  76
  77         st = talloc(mem_ctx, struct dcesrv_forward_state);
  78         if (st == NULL) {
  79                 dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
  80                 return;
  81         }
  82
  83         st->dce_call = dce_call;
  84         st->opname   = opname;
  85
  86         /* if the caller has said they can't support async calls
  87            then fail the call */
  88         if (!(dce_call->state_flags & DCESRV_CALL_STATE_FLAG_MAY_ASYNC)) {
  89                 /* we're not allowed to reply async */
  90                 DEBUG(0,("%s: Not available synchronously\n", dest_task));
  91                 dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
  92                 return;
  93         }
  94
  95         binding_handle = irpc_binding_handle_by_name(st, dce_call->msg_ctx,
  96                                                      dest_task, ndr_table);
  97         if (binding_handle == NULL) {
  98                 DEBUG(0,("%s: Failed to forward request to %s task\n",
  99                          opname, dest_task));
 100                 dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
 101                 return;
 102         }
 103
 104         /* reset timeout for the handle */
 105         dcerpc_binding_handle_set_timeout(binding_handle, timeout);
 106
 107         /* add security token to the handle*/
 108         token = dce_call->conn->auth_state.session_info->security_token;
 109         irpc_binding_handle_add_security_token(binding_handle, token);
 110
 111         /* forward the call */
 112         subreq = dcerpc_binding_handle_call_send(st, dce_call->event_ctx,
 113                                                  binding_handle,
 114                                                  NULL, ndr_table,
 115                                                  callid,
 116                                                  dce_call, r);
 117         if (subreq == NULL) {
 118                 DEBUG(0,("%s: Failed to forward request to %s task\n",
 119                          opname, dest_task));
 120                 dce_call->fault_code = DCERPC_FAULT_CANT_PERFORM;
 121                 return;
 122         }
 123
 124         /* mark the request as replied async */
 125         dce_call->state_flags |= DCESRV_CALL_STATE_FLAG_ASYNC;
 126
 127         /* setup the callback */
 128         tevent_req_set_callback(subreq, dcesrv_irpc_forward_callback, st);
 129 }