source4/smbd/service_task.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    helper functions for task based servers (nbtd, winbind etc)
   5
   6    Copyright (C) Andrew Tridgell 2005
   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 "process_model.h"
  24 #include "lib/messaging/irpc.h"
  25 #include "param/param.h"
  26 #include "librpc/gen_ndr/ndr_irpc_c.h"
  27
  28 /*
  29   terminate a task service
  30 */
  31 void task_server_terminate(struct task_server *task, const char *reason, bool fatal)
  32 {
  33         struct tevent_context *event_ctx = task->event_ctx;
  34         const struct model_ops *model_ops = task->model_ops;
  35         DEBUG(0,("task_server_terminate: [%s]\n", reason));
  36
  37         if (fatal && task->msg_ctx != NULL) {
  38                 struct dcerpc_binding_handle *irpc_handle;
  39                 struct samba_terminate r;
  40
  41                 irpc_handle = irpc_binding_handle_by_name(task, task->msg_ctx,
  42                                                           "samba", &ndr_table_irpc);
  43                 if (irpc_handle != NULL) {
  44                         /* Note: this makes use of nested event loops... */
  45                         dcerpc_binding_handle_set_sync_ev(irpc_handle, event_ctx);
  46                         r.in.reason = reason;
  47                         dcerpc_samba_terminate_r(irpc_handle, task, &r);
  48                 }
  49         }
  50
  51         imessaging_cleanup(task->msg_ctx);
  52
  53         model_ops->terminate(event_ctx, task->lp_ctx, reason);
  54
  55         /* don't free this above, it might contain the 'reason' being printed */
  56         talloc_free(task);
  57 }
  58
  59 /* used for the callback from the process model code */
  60 struct task_state {
  61         void (*task_init)(struct task_server *);
  62         const struct model_ops *model_ops;
  63 };
  64
  65
  66 /*
  67   called by the process model code when the new task starts up. This then calls
  68   the server specific startup code
  69 */
  70 static void task_server_callback(struct tevent_context *event_ctx,
  71                                  struct loadparm_context *lp_ctx,
  72                                  struct server_id server_id, void *private_data)
  73 {
  74         struct task_state *state = talloc_get_type(private_data, struct task_state);
  75         struct task_server *task;
  76
  77         task = talloc(event_ctx, struct task_server);
  78         if (task == NULL) return;
  79
  80         task->event_ctx = event_ctx;
  81         task->model_ops = state->model_ops;
  82         task->server_id = server_id;
  83         task->lp_ctx = lp_ctx;
  84
  85         task->msg_ctx = imessaging_init(task,
  86                                         task->lp_ctx,
  87                                         task->server_id,
  88                                         task->event_ctx, false);
  89         if (!task->msg_ctx) {
  90                 task_server_terminate(task, "imessaging_init() failed", true);
  91                 return;
  92         }
  93
  94         state->task_init(task);
  95 }
  96
  97 /*
  98   startup a task based server
  99 */
 100 NTSTATUS task_server_startup(struct tevent_context *event_ctx,
 101                              struct loadparm_context *lp_ctx,
 102                              const char *service_name,
 103                              const struct model_ops *model_ops,
 104                              void (*task_init)(struct task_server *))
 105 {
 106         struct task_state *state;
 107
 108         state = talloc(event_ctx, struct task_state);
 109         NT_STATUS_HAVE_NO_MEMORY(state);
 110
 111         state->task_init = task_init;
 112         state->model_ops = model_ops;
 113
 114         model_ops->new_task(event_ctx, lp_ctx, service_name, task_server_callback, state);
 115
 116         return NT_STATUS_OK;
 117 }
 118
 119 /*
 120   setup a task title
 121 */
 122 void task_server_set_title(struct task_server *task, const char *title)
 123 {
 124         task->model_ops->set_title(task->event_ctx, title);
 125 }