source: vendor/current/file_server/file_server.c

/*
   Unix SMB/CIFS implementation.

   run s3 file server within Samba4

   Copyright (C) Andrew Tridgell        2011

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "talloc.h"
#include "tevent.h"
#include "system/filesys.h"
#include "lib/param/param.h"
#include "source4/smbd/service.h"
#include "source4/smbd/process_model.h"
#include "file_server/file_server.h"
#include "dynconfig.h"
#include "nsswitch/winbind_client.h"

/*
  called if smbd exits
 */
static void file_server_smbd_done(struct tevent_req *subreq)
{
        struct task_server *task =
                tevent_req_callback_data(subreq,
                struct task_server);
        int sys_errno;
        int ret;

        ret = samba_runcmd_recv(subreq, &sys_errno);
        if (ret != 0) {
                DEBUG(0,("file_server smbd daemon died with exit status %d\n", sys_errno));
        } else {
                DEBUG(0,("file_server smbd daemon exited normally\n"));
        }
        task_server_terminate(task, "smbd child process exited", true);
}


/*
  startup a copy of smbd as a child daemon
*/
static void s3fs_task_init(struct task_server *task)
{
        struct tevent_req *subreq;
        const char *smbd_path;
        const char *smbd_cmd[2] = { NULL, NULL };

        task_server_set_title(task, "task[s3fs_parent]");

        smbd_path = talloc_asprintf(task, "%s/smbd", dyn_SBINDIR);
        smbd_cmd[0] = smbd_path;

        /* the child should be able to call through nss_winbind */
        (void)winbind_on();
        /* start it as a child process */
        subreq = samba_runcmd_send(task, task->event_ctx, timeval_zero(), 1, 0,
                                smbd_cmd,
                                "-D",
                                "--option=server role check:inhibit=yes",
                                "--foreground",
                                debug_get_output_is_stdout()?"--log-stdout":NULL,
                                NULL);
        /* the parent should not be able to call through nss_winbind */
        if (!winbind_off()) {
                DEBUG(0,("Failed to re-disable recursive winbindd calls after forking smbd\n"));
                task_server_terminate(task, "Failed to re-disable recursive winbindd calls", true);
                return;
        }
        if (subreq == NULL) {
                DEBUG(0, ("Failed to start smbd as child daemon\n"));
                task_server_terminate(task, "Failed to startup s3fs smb task", true);
                return;
        }

        tevent_req_set_callback(subreq, file_server_smbd_done, task);

        DEBUG(5,("Started file server child smbd\n"));
}

/* called at smbd startup - register ourselves as a server service */
NTSTATUS server_service_s3fs_init(void);

NTSTATUS server_service_s3fs_init(void)
{
        return register_server_service("s3fs", s3fs_task_init);
}