file_server/file_server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    run s3 file server within Samba4
   5
   6    Copyright (C) Andrew Tridgell        2011
   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 "talloc.h"
  24 #include "tevent.h"
  25 #include "system/filesys.h"
  26 #include "lib/param/param.h"
  27 #include "source4/samba/service.h"
  28 #include "source4/samba/process_model.h"
  29 #include "dynconfig.h"
  30 #include "nsswitch/winbind_client.h"
  31
  32 /*
  33   called if smbd exits
  34  */
  35 static void file_server_smbd_done(struct tevent_req *subreq)
  36 {
  37         struct task_server *task =
  38                 tevent_req_callback_data(subreq,
  39                 struct task_server);
  40         int sys_errno;
  41         int ret;
  42
  43         ret = samba_runcmd_recv(subreq, &sys_errno);
  44         if (ret != 0) {
  45                 DEBUG(0,("file_server smbd daemon died with exit status %d\n", sys_errno));
  46         } else {
  47                 DEBUG(0,("file_server smbd daemon exited normally\n"));
  48         }
  49         task_server_terminate(task, "smbd child process exited", true);
  50 }
  51
  52
  53 /*
  54   startup a copy of smbd as a child daemon
  55 */
  56 static NTSTATUS s3fs_task_init(struct task_server *task)
  57 {
  58         struct tevent_req *subreq;
  59         const char *smbd_path;
  60         const char *smbd_cmd[2] = { NULL, NULL };
  61         const char *config_file = "";
  62
  63         task_server_set_title(task, "task[s3fs_parent]");
  64
  65         smbd_path = talloc_asprintf(task, "%s/smbd", dyn_SBINDIR);
  66         if (smbd_path == NULL) {
  67                 return NT_STATUS_NO_MEMORY;
  68         }
  69         smbd_cmd[0] = smbd_path;
  70
  71         if (!is_default_dyn_CONFIGFILE()) {
  72                 config_file = talloc_asprintf(task,
  73                                               "--configfile=%s",
  74                                               get_dyn_CONFIGFILE());
  75                 if (config_file == NULL) {
  76                         return NT_STATUS_NO_MEMORY;
  77                 }
  78         }
  79
  80         /* the child should be able to call through nss_winbind */
  81         (void)winbind_on();
  82         /* start it as a child process */
  83         subreq = samba_runcmd_send(task, task->event_ctx, timeval_zero(), 1, 0,
  84                                 smbd_cmd,
  85                                 "-D",
  86                                 "--option=server role check:inhibit=yes",
  87                                 "--foreground",
  88                                 config_file,
  89                                 debug_get_output_is_stdout()?"--debug-stdout":NULL,
  90                                 NULL);
  91         /* the parent should not be able to call through nss_winbind */
  92         if (!winbind_off()) {
  93                 DEBUG(0,("Failed to re-disable recursive winbindd calls after forking smbd\n"));
  94                 task_server_terminate(task, "Failed to re-disable recursive winbindd calls", true);
  95                 return NT_STATUS_UNSUCCESSFUL;
  96         }
  97         if (subreq == NULL) {
  98                 DEBUG(0, ("Failed to start smbd as child daemon\n"));
  99                 task_server_terminate(task, "Failed to startup s3fs smb task", true);
 100                 return NT_STATUS_UNSUCCESSFUL;
 101         }
 102
 103         tevent_req_set_callback(subreq, file_server_smbd_done, task);
 104
 105         DEBUG(5,("Started file server child smbd\n"));
 106
 107         return NT_STATUS_OK;
 108 }
 109
 110 /* called at smbd startup - register ourselves as a server service */
 111 NTSTATUS server_service_s3fs_init(TALLOC_CTX *);
 112
 113 NTSTATUS server_service_s3fs_init(TALLOC_CTX *ctx)
 114 {
 115         struct service_details details = {
 116                 .inhibit_fork_on_accept = true,
 117                 .inhibit_pre_fork = true,
 118                 .task_init = s3fs_task_init,
 119                 .post_fork = NULL
 120         };
 121         return register_server_service(ctx, "s3fs", &details);
 122 }