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         if (fatal) {
  36                 DBG_ERR("task_server_terminate: [%s]\n", reason);
  37         } else {
  38                 DBG_NOTICE("task_server_terminate: [%s]\n", reason);
  39         }
  40
  41         if (fatal && task->msg_ctx != NULL) {
  42                 struct dcerpc_binding_handle *irpc_handle;
  43                 struct samba_terminate r;
  44
  45                 irpc_handle = irpc_binding_handle_by_name(task, task->msg_ctx,
  46                                                           "samba", &ndr_table_irpc);
  47                 if (irpc_handle != NULL) {
  48                         /* Note: this makes use of nested event loops... */
  49                         dcerpc_binding_handle_set_sync_ev(irpc_handle, event_ctx);
  50                         r.in.reason = reason;
  51                         dcerpc_samba_terminate_r(irpc_handle, task, &r);
  52                 }
  53         }
  54
  55         imessaging_cleanup(task->msg_ctx);
  56
  57         model_ops->terminate(event_ctx, task->lp_ctx, reason,
  58                              task->process_context);
  59         /* don't free this above, it might contain the 'reason' being printed */
  60         talloc_free(task);
  61 }
  62
  63 /* used for the callback from the process model code */
  64 struct task_state {
  65         void (*task_init)(struct task_server *);
  66         const struct model_ops *model_ops;
  67 };
  68
  69
  70 /*
  71   called by the process model code when the new task starts up. This then calls
  72   the server specific startup code
  73 */
  74 static void task_server_callback(struct tevent_context *event_ctx,
  75                                  struct loadparm_context *lp_ctx,
  76                                  struct server_id server_id,
  77                                  void *private_data,
  78                                  void *context)
  79 {
  80         struct task_state *state = talloc_get_type(private_data, struct task_state);
  81         struct task_server *task;
  82
  83         task = talloc(event_ctx, struct task_server);
  84         if (task == NULL) return;
  85
  86         task->event_ctx = event_ctx;
  87         task->model_ops = state->model_ops;
  88         task->server_id = server_id;
  89         task->lp_ctx = lp_ctx;
  90         task->process_context = context;
  91
  92         task->msg_ctx = imessaging_init(task,
  93                                         task->lp_ctx,
  94                                         task->server_id,
  95                                         task->event_ctx);
  96         if (!task->msg_ctx) {
  97                 task_server_terminate(task, "imessaging_init() failed", true);
  98                 return;
  99         }
 100
 101         state->task_init(task);
 102 }
 103
 104 /*
 105   startup a task based server
 106 */
 107 NTSTATUS task_server_startup(struct tevent_context *event_ctx,
 108                              struct loadparm_context *lp_ctx,
 109                              const char *service_name,
 110                              const struct model_ops *model_ops,
 111                              void (*task_init)(struct task_server *),
 112                              const struct service_details *service_details,
 113                              int from_parent_fd)
 114 {
 115         struct task_state *state;
 116
 117         state = talloc(event_ctx, struct task_state);
 118         NT_STATUS_HAVE_NO_MEMORY(state);
 119
 120         state->task_init = task_init;
 121         state->model_ops = model_ops;
 122
 123         state->model_ops->new_task(event_ctx, lp_ctx, service_name,
 124                                    task_server_callback, state, service_details,
 125                                    from_parent_fd);
 126
 127         return NT_STATUS_OK;
 128 }
 129
 130 /*
 131   setup a task title
 132 */
 133 void task_server_set_title(struct task_server *task, const char *title)
 134 {
 135         task->model_ops->set_title(task->event_ctx, title);
 136 }