s3:utils: Fix 'Usage:' for 'net ads enctypes'

[samba4-gss.git] / source3 / smbd / server.c

/*
   Unix SMB/CIFS implementation.
   Main SMB server routines
   Copyright (C) Andrew Tridgell                1992-1998
   Copyright (C) Martin Pool                    2002
   Copyright (C) Jelmer Vernooij                2002-2003
   Copyright (C) Volker Lendecke                1993-2007
   Copyright (C) Jeremy Allison                 1993-2007

   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 "system/filesys.h"
#include "lib/util/server_id.h"
#include "lib/util/close_low_fd.h"
#include "lib/cmdline/cmdline.h"
#include "locking/share_mode_lock.h"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "source3/smbd/smbXsrv_session.h"
#include "smbd/smbXsrv_open.h"
#include "registry/reg_init_full.h"
#include "libcli/auth/schannel.h"
#include "secrets.h"
#include "../lib/util/memcache.h"
#include "ctdbd_conn.h"
#include "lib/util/util_process.h"
#include "util_cluster.h"
#include "printing/queue_process.h"
#include "rpc_server/rpc_config.h"
#include "passdb.h"
#include "auth.h"
#include "messages.h"
#include "messages_ctdb.h"
#include "smbprofile.h"
#include "lib/id_cache.h"
#include "lib/param/param.h"
#include "lib/background.h"
#include "../lib/util/pidfile.h"
#include "lib/smbd_shim.h"
#include "scavenger.h"
#include "locking/leases_db.h"
#include "smbd/notifyd/notifyd.h"
#include "smbd/smbd_cleanupd.h"
#include "lib/util/sys_rw.h"
#include "cleanupdb.h"
#include "g_lock.h"
#include "lib/global_contexts.h"
#include "source3/lib/substitute.h"
#include "lib/addrchange.h"

#ifdef CLUSTER_SUPPORT
#include "ctdb_protocol.h"
#endif

struct smbd_open_socket;
struct smbd_child_pid;

struct smbd_parent_context {
        bool interactive;

        struct tevent_context *ev_ctx;
        struct messaging_context *msg_ctx;

        /* the list of listening sockets */
        struct smbd_open_socket *sockets;

        /* the list of current child processes */
        struct smbd_child_pid *children;
        size_t num_children;

        struct server_id cleanupd;
        struct server_id notifyd;

        struct tevent_timer *cleanup_te;
};

struct smbd_open_socket {
        struct smbd_open_socket *prev, *next;
        struct smbd_parent_context *parent;
        int fd;
        struct tevent_fd *fde;
};

struct smbd_child_pid {
        struct smbd_child_pid *prev, *next;
        pid_t pid;
};

/*******************************************************************
 What to do when smb.conf is updated.
 ********************************************************************/

static NTSTATUS messaging_send_to_children(struct messaging_context *msg_ctx,
                                           uint32_t msg_type, DATA_BLOB* data);

static void smbd_parent_conf_updated(struct messaging_context *msg,
                                     void *private_data,
                                     uint32_t msg_type,
                                     struct server_id server_id,
                                     DATA_BLOB *data)
{
        bool ok;

        DEBUG(10,("smbd_parent_conf_updated: Got message saying smb.conf was "
                  "updated. Reloading.\n"));
        change_to_root_user();
        reload_services(NULL, NULL, false);

        ok = reinit_guest_session_info(NULL);
        if (!ok) {
                DBG_ERR("Failed to reinit guest info\n");
        }
        messaging_send_to_children(msg, MSG_SMB_CONF_UPDATED, NULL);
}

/****************************************************************************
  Send a SIGTERM to our process group.
*****************************************************************************/

static void  killkids(void)
{
        if(am_parent) kill(0,SIGTERM);
}

static void msg_exit_server(struct messaging_context *msg,
                            void *private_data,
                            uint32_t msg_type,
                            struct server_id server_id,
                            DATA_BLOB *data)
{
        DEBUG(3, ("got a SHUTDOWN message\n"));
        exit_server_cleanly(NULL);
}

#ifdef DEVELOPER
static void msg_inject_fault(struct messaging_context *msg,
                             void *private_data,
                             uint32_t msg_type,
                             struct server_id src,
                             DATA_BLOB *data)
{
        int sig;
        struct server_id_buf tmp;

        if (data->length != sizeof(sig)) {
                DEBUG(0, ("Process %s sent bogus signal injection request\n",
                          server_id_str_buf(src, &tmp)));
                return;
        }

        sig = *(int *)data->data;
        if (sig == -1) {
                exit_server("internal error injected");
                return;
        }

#ifdef HAVE_STRSIGNAL
        DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
                  server_id_str_buf(src, &tmp), sig, strsignal(sig)));
#else
        DEBUG(0, ("Process %s requested injection of signal %d\n",
                  server_id_str_buf(src, &tmp), sig));
#endif

        kill(getpid(), sig);
}
#endif /* DEVELOPER */

#if defined(DEVELOPER) || defined(ENABLE_SELFTEST)
/*
 * Sleep for the specified number of seconds.
 */
static void msg_sleep(struct messaging_context *msg,
                      void *private_data,
                      uint32_t msg_type,
                      struct server_id src,
                      DATA_BLOB *data)
{
        unsigned int seconds;
        struct server_id_buf tmp;

        if (data->length != sizeof(seconds)) {
                DBG_ERR("Process %s sent bogus sleep request\n",
                        server_id_str_buf(src, &tmp));
                return;
        }

        seconds = *(unsigned int *)data->data;
        DBG_ERR("Process %s request a sleep of %u seconds\n",
                server_id_str_buf(src, &tmp),
                seconds);
        sleep(seconds);
        DBG_ERR("Restarting after %u second sleep requested by process %s\n",
                seconds,
                server_id_str_buf(src, &tmp));
}
#endif /* DEVELOPER */

static NTSTATUS messaging_send_to_children(struct messaging_context *msg_ctx,
                                           uint32_t msg_type, DATA_BLOB* data)
{
        NTSTATUS status;
        struct smbd_parent_context *parent = am_parent;
        struct smbd_child_pid *child;

        if (parent == NULL) {
                return NT_STATUS_INTERNAL_ERROR;
        }

        for (child = parent->children; child != NULL; child = child->next) {
                status = messaging_send(parent->msg_ctx,
                                        pid_to_procid(child->pid),
                                        msg_type, data);
                if (!NT_STATUS_IS_OK(status)) {
                        DBG_DEBUG("messaging_send(%d) failed: %s\n",
                                  (int)child->pid, nt_errstr(status));
                }
        }
        return NT_STATUS_OK;
}

static void smb_parent_send_to_children(struct messaging_context *ctx,
                                        void* data,
                                        uint32_t msg_type,
                                        struct server_id srv_id,
                                        DATA_BLOB* msg_data)
{
        messaging_send_to_children(ctx, msg_type, msg_data);
}

/*
 * Parent smbd process sets its own debug level first and then
 * sends a message to all the smbd children to adjust their debug
 * level to that of the parent.
 */

static void smbd_msg_debug(struct messaging_context *msg_ctx,
                           void *private_data,
                           uint32_t msg_type,
                           struct server_id server_id,
                           DATA_BLOB *data)
{
        debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);

        messaging_send_to_children(msg_ctx, MSG_DEBUG, data);
}

static void smbd_parent_id_cache_kill(struct messaging_context *msg_ctx,
                                      void *private_data,
                                      uint32_t msg_type,
                                      struct server_id server_id,
                                      DATA_BLOB* data)
{
        const char *msg = (data && data->data)
                ? (const char *)data->data : "<NULL>";
        struct id_cache_ref id;

        if (!id_cache_ref_parse(msg, &id)) {
                DEBUG(0, ("Invalid ?ID: %s\n", msg));
                return;
        }

        id_cache_delete_from_cache(&id);

        messaging_send_to_children(msg_ctx, msg_type, data);
}

static void smbd_parent_id_cache_delete(struct messaging_context *ctx,
                                        void* data,
                                        uint32_t msg_type,
                                        struct server_id srv_id,
                                        DATA_BLOB* msg_data)
{
        id_cache_delete_message(ctx, data, msg_type, srv_id, msg_data);

        messaging_send_to_children(ctx, msg_type, msg_data);
}

static void add_child_pid(struct smbd_parent_context *parent,
                          pid_t pid)
{
        struct smbd_child_pid *child;

        child = talloc_zero(parent, struct smbd_child_pid);
        if (child == NULL) {
                DEBUG(0, ("Could not add child struct -- malloc failed\n"));
                return;
        }
        child->pid = pid;
        DLIST_ADD(parent->children, child);
        parent->num_children += 1;
}

static void smb_tell_num_children(struct messaging_context *ctx, void *data,
                                  uint32_t msg_type, struct server_id srv_id,
                                  DATA_BLOB *msg_data)
{
        uint8_t buf[sizeof(uint32_t)];

        if (am_parent) {
                SIVAL(buf, 0, am_parent->num_children);
                messaging_send_buf(ctx, srv_id, MSG_SMB_NUM_CHILDREN,
                                   buf, sizeof(buf));
        }
}

static void notifyd_stopped(struct tevent_req *req);

static struct tevent_req *notifyd_req(struct messaging_context *msg_ctx,
                                      struct tevent_context *ev)
{
        struct tevent_req *req;
        sys_notify_watch_fn sys_notify_watch = NULL;
        struct sys_notify_context *sys_notify_ctx = NULL;
        struct ctdbd_connection *ctdbd_conn = NULL;

        if (lp_kernel_change_notify()) {

#ifdef HAVE_INOTIFY
                if (lp_parm_bool(-1, "notify", "inotify", true)) {
                        sys_notify_watch = inotify_watch;
                }
#endif

#ifdef HAVE_FAM
                if (lp_parm_bool(-1, "notify", "fam",
                                 (sys_notify_watch == NULL))) {
                        sys_notify_watch = fam_watch;
                }
#endif
        }

        if (sys_notify_watch != NULL) {
                sys_notify_ctx = sys_notify_context_create(msg_ctx, ev);
                if (sys_notify_ctx == NULL) {
                        return NULL;
                }
        }

        if (lp_clustering()) {
                ctdbd_conn = messaging_ctdb_connection();
        }

        req = notifyd_send(msg_ctx, ev, msg_ctx, ctdbd_conn,
                           sys_notify_watch, sys_notify_ctx);
        if (req == NULL) {
                TALLOC_FREE(sys_notify_ctx);
                return NULL;
        }
        tevent_req_set_callback(req, notifyd_stopped, msg_ctx);

        return req;
}

static void notifyd_stopped(struct tevent_req *req)
{
        int ret;

        ret = notifyd_recv(req);
        TALLOC_FREE(req);
        DEBUG(1, ("notifyd stopped: %s\n", strerror(ret)));
}

static void notifyd_sig_hup_handler(struct tevent_context *ev,
                                    struct tevent_signal *se,
                                    int signum,
                                    int count,
                                    void *siginfo,
                                    void *pvt)
{
        DBG_NOTICE("notifyd: Reloading services after SIGHUP\n");
        reload_services(NULL, NULL, false);
        reopen_logs();
}

static bool smbd_notifyd_init(struct messaging_context *msg, bool interactive,
                              struct server_id *ppid)
{
        struct tevent_context *ev = messaging_tevent_context(msg);
        struct tevent_req *req;
        struct tevent_signal *se = NULL;
        pid_t pid;
        NTSTATUS status;
        bool ok;

        if (interactive) {
                req = notifyd_req(msg, ev);
                return (req != NULL);
        }

        pid = fork();
        if (pid == -1) {
                DEBUG(1, ("%s: fork failed: %s\n", __func__,
                          strerror(errno)));
                return false;
        }

        if (pid != 0) {
                if (am_parent != NULL) {
                        add_child_pid(am_parent, pid);
                }
                *ppid = pid_to_procid(pid);
                return true;
        }

        status = smbd_reinit_after_fork(msg, ev, true);
        if (!NT_STATUS_IS_OK(status)) {
                DEBUG(1, ("%s: reinit_after_fork failed: %s\n",
                          __func__, nt_errstr(status)));
                exit(1);
        }

        process_set_title("smbd-notifyd", "notifyd");

        reopen_logs();

        /* Set up sighup handler for notifyd */
        se = tevent_add_signal(ev,
                               ev,
                               SIGHUP, 0,
                               notifyd_sig_hup_handler,
                               NULL);
        if (!se) {
                DEBUG(0, ("failed to setup notifyd SIGHUP handler\n"));
                exit(1);
        }

        req = notifyd_req(msg, ev);
        if (req == NULL) {
                exit(1);
        }
        tevent_req_set_callback(req, notifyd_stopped, msg);

        /* Block those signals that we are not handling */
        BlockSignals(True, SIGUSR1);

        messaging_send(msg, pid_to_procid(getppid()), MSG_SMB_NOTIFY_STARTED,
                       NULL);

        ok = tevent_req_poll(req, ev);
        if (!ok) {
                DBG_WARNING("tevent_req_poll returned %s\n", strerror(errno));
                exit(1);
        }
        exit(0);
}

static void notifyd_init_trigger(struct tevent_req *req);

struct notifyd_init_state {
        bool ok;
        struct tevent_context *ev;
        struct messaging_context *msg;
        struct server_id *ppid;
};

static struct tevent_req *notifyd_init_send(struct tevent_context *ev,
                                            TALLOC_CTX *mem_ctx,
                                            struct messaging_context *msg,
                                            struct server_id *ppid)
{
        struct tevent_req *req = NULL;
        struct tevent_req *subreq = NULL;
        struct notifyd_init_state *state = NULL;

        req = tevent_req_create(mem_ctx, &state, struct notifyd_init_state);
        if (req == NULL) {
                return NULL;
        }

        *state = (struct notifyd_init_state) {
                .msg = msg,
                .ev = ev,
                .ppid = ppid
        };

        subreq = tevent_wakeup_send(state, ev, tevent_timeval_current_ofs(1, 0));
        if (tevent_req_nomem(subreq, req)) {
                return tevent_req_post(req, ev);
        }

        tevent_req_set_callback(subreq, notifyd_init_trigger, req);
        return req;
}

static void notifyd_init_trigger(struct tevent_req *subreq)
{
        struct tevent_req *req = tevent_req_callback_data(
                subreq, struct tevent_req);
        struct notifyd_init_state *state = tevent_req_data(
                req, struct notifyd_init_state);
        bool ok;

        DBG_NOTICE("Triggering notifyd startup\n");

        ok = tevent_wakeup_recv(subreq);
        TALLOC_FREE(subreq);
        if (!ok) {
                tevent_req_error(req, ENOMEM);
                return;
        }

        state->ok = smbd_notifyd_init(state->msg, false, state->ppid);
        if (state->ok) {
                DBG_WARNING("notifyd restarted\n");
                tevent_req_done(req);
                return;
        }

        DBG_NOTICE("notifyd startup failed, rescheduling\n");

        subreq = tevent_wakeup_send(state, state->ev,
                                    tevent_timeval_current_ofs(1, 0));
        if (tevent_req_nomem(subreq, req)) {
                DBG_ERR("scheduling notifyd restart failed, giving up\n");
                return;
        }

        tevent_req_set_callback(subreq, notifyd_init_trigger, req);
        return;
}

static bool notifyd_init_recv(struct tevent_req *req)
{
        struct notifyd_init_state *state = tevent_req_data(
                req, struct notifyd_init_state);

        return state->ok;
}

static void notifyd_started(struct tevent_req *req)
{
        bool ok;

        ok = notifyd_init_recv(req);
        TALLOC_FREE(req);
        if (!ok) {
                DBG_ERR("Failed to restart notifyd, giving up\n");
                return;
        }
}

static void cleanupd_sig_hup_handler(struct tevent_context *ev,
                                     struct tevent_signal *se,
                                     int signum,
                                     int count,
                                     void *siginfo,
                                     void *pvt)
{
        DBG_NOTICE("cleanupd: Reloading services after SIGHUP\n");
        reopen_logs();
}

static void cleanupd_stopped(struct tevent_req *req);

static bool cleanupd_init(struct messaging_context *msg, bool interactive,
                          struct server_id *ppid)
{
        struct tevent_context *ev = messaging_tevent_context(msg);
        struct server_id parent_id = messaging_server_id(msg);
        struct tevent_signal *se = NULL;
        struct tevent_req *req;
        pid_t pid;
        NTSTATUS status;
        ssize_t rwret;
        int ret;
        bool ok;
        char c;
        int up_pipe[2];

        if (interactive) {
                req = smbd_cleanupd_send(msg, ev, msg, parent_id.pid);
                *ppid = messaging_server_id(msg);
                return (req != NULL);
        }

        ret = pipe(up_pipe);
        if (ret == -1) {
                DBG_WARNING("pipe failed: %s\n", strerror(errno));
                return false;
        }

        pid = fork();
        if (pid == -1) {
                DBG_WARNING("fork failed: %s\n", strerror(errno));
                close(up_pipe[0]);
                close(up_pipe[1]);
                return false;
        }

        if (pid != 0) {

                close(up_pipe[1]);
                rwret = sys_read(up_pipe[0], &c, 1);
                close(up_pipe[0]);

                if (rwret == -1) {
                        DBG_WARNING("sys_read failed: %s\n", strerror(errno));
                        return false;
                }
                if (rwret == 0) {
                        DBG_WARNING("cleanupd could not start\n");
                        return false;
                }
                if (c != 0) {
                        DBG_WARNING("cleanupd returned %d\n", (int)c);
                        return false;
                }

                DBG_DEBUG("Started cleanupd pid=%d\n", (int)pid);

                if (am_parent != NULL) {
                        add_child_pid(am_parent, pid);
                }

                *ppid = pid_to_procid(pid);
                return true;
        }

        close(up_pipe[0]);

        status = smbd_reinit_after_fork(msg, ev, true);
        if (!NT_STATUS_IS_OK(status)) {
                DBG_WARNING("reinit_after_fork failed: %s\n",
                            nt_errstr(status));
                c = 1;
                sys_write(up_pipe[1], &c, 1);

                exit(1);
        }

        process_set_title("smbd-cleanupd", "cleanupd");

        se = tevent_add_signal(ev,
                               ev,
                               SIGHUP,
                               0,
                               cleanupd_sig_hup_handler,
                               NULL);
        if (se == NULL) {
                DBG_ERR("Could not add SIGHUP handler\n");
                exit(1);
        }

        req = smbd_cleanupd_send(msg, ev, msg, parent_id.pid);
        if (req == NULL) {
                DBG_WARNING("smbd_cleanupd_send failed\n");
                c = 2;
                sys_write(up_pipe[1], &c, 1);

                exit(1);
        }

        tevent_req_set_callback(req, cleanupd_stopped, msg);

        c = 0;
        rwret = sys_write(up_pipe[1], &c, 1);
        close(up_pipe[1]);

        if (rwret == -1) {
                DBG_WARNING("sys_write failed: %s\n", strerror(errno));
                exit(1);
        }
        if (rwret != 1) {
                DBG_WARNING("sys_write could not write result\n");
                exit(1);
        }

        ok = tevent_req_poll(req, ev);
        if (!ok) {
                DBG_WARNING("tevent_req_poll returned %s\n", strerror(errno));
        }
        exit(0);
}

static void cleanupd_stopped(struct tevent_req *req)
{
        NTSTATUS status;

        status = smbd_cleanupd_recv(req);
        DBG_WARNING("cleanupd stopped: %s\n", nt_errstr(status));
}

static void cleanupd_init_trigger(struct tevent_req *req);

struct cleanup_init_state {
        bool ok;
        struct tevent_context *ev;
        struct messaging_context *msg;
        struct server_id *ppid;
};

static struct tevent_req *cleanupd_init_send(struct tevent_context *ev,
                                             TALLOC_CTX *mem_ctx,
                                             struct messaging_context *msg,
                                             struct server_id *ppid)
{
        struct tevent_req *req = NULL;
        struct tevent_req *subreq = NULL;
        struct cleanup_init_state *state = NULL;

        req = tevent_req_create(mem_ctx, &state, struct cleanup_init_state);
        if (req == NULL) {
                return NULL;
        }

        *state = (struct cleanup_init_state) {
                .msg = msg,
                .ev = ev,
                .ppid = ppid
        };

        subreq = tevent_wakeup_send(state, ev, tevent_timeval_current_ofs(0, 0));
        if (tevent_req_nomem(subreq, req)) {
                return tevent_req_post(req, ev);
        }

        tevent_req_set_callback(subreq, cleanupd_init_trigger, req);
        return req;
}

static void cleanupd_init_trigger(struct tevent_req *subreq)
{
        struct tevent_req *req = tevent_req_callback_data(
                subreq, struct tevent_req);
        struct cleanup_init_state *state = tevent_req_data(
                req, struct cleanup_init_state);
        bool ok;

        DBG_NOTICE("Triggering cleanupd startup\n");

        ok = tevent_wakeup_recv(subreq);
        TALLOC_FREE(subreq);
        if (!ok) {
                tevent_req_error(req, ENOMEM);
                return;
        }

        state->ok = cleanupd_init(state->msg, false, state->ppid);
        if (state->ok) {
                DBG_WARNING("cleanupd restarted\n");
                tevent_req_done(req);
                return;
        }

        DBG_NOTICE("cleanupd startup failed, rescheduling\n");

        subreq = tevent_wakeup_send(state, state->ev,
                                    tevent_timeval_current_ofs(1, 0));
        if (tevent_req_nomem(subreq, req)) {
                DBG_ERR("scheduling cleanupd restart failed, giving up\n");
                return;
        }

        tevent_req_set_callback(subreq, cleanupd_init_trigger, req);
        return;
}

static bool cleanupd_init_recv(struct tevent_req *req)
{
        struct cleanup_init_state *state = tevent_req_data(
                req, struct cleanup_init_state);

        return state->ok;
}

static void cleanupd_started(struct tevent_req *req)
{
        bool ok;
        NTSTATUS status;
        struct smbd_parent_context *parent = tevent_req_callback_data(
                req, struct smbd_parent_context);

        ok = cleanupd_init_recv(req);
        TALLOC_FREE(req);
        if (!ok) {
                DBG_ERR("Failed to restart cleanupd, giving up\n");
                return;
        }

        status = messaging_send(parent->msg_ctx,
                                parent->cleanupd,
                                MSG_SMB_NOTIFY_CLEANUP,
                                &data_blob_null);
        if (!NT_STATUS_IS_OK(status)) {
                DBG_ERR("messaging_send returned %s\n",
                        nt_errstr(status));
        }
}

static void remove_child_pid(struct smbd_parent_context *parent,
                             pid_t pid,
                             bool unclean_shutdown)
{
        struct smbd_child_pid *child;
        NTSTATUS status;
        bool ok;

        for (child = parent->children; child != NULL; child = child->next) {
                if (child->pid == pid) {
                        struct smbd_child_pid *tmp = child;
                        DLIST_REMOVE(parent->children, child);
                        TALLOC_FREE(tmp);
                        parent->num_children -= 1;
                        break;
                }
        }

        if (child == NULL) {
                /* not all forked child processes are added to the children list */
                DEBUG(2, ("Could not find child %d -- ignoring\n", (int)pid));
                return;
        }

        if (pid == procid_to_pid(&parent->cleanupd)) {
                struct tevent_req *req;

                server_id_set_disconnected(&parent->cleanupd);

                DBG_WARNING("Restarting cleanupd\n");
                req = cleanupd_init_send(messaging_tevent_context(parent->msg_ctx),
                                         parent,
                                         parent->msg_ctx,
                                         &parent->cleanupd);
                if (req == NULL) {
                        DBG_ERR("Failed to restart cleanupd\n");
                        return;
                }
                tevent_req_set_callback(req, cleanupd_started, parent);
                return;
        }

        if (pid == procid_to_pid(&parent->notifyd)) {
                struct tevent_req *req;
                struct tevent_context *ev = messaging_tevent_context(
                        parent->msg_ctx);

                server_id_set_disconnected(&parent->notifyd);

                DBG_WARNING("Restarting notifyd\n");
                req = notifyd_init_send(ev,
                                        parent,
                                        parent->msg_ctx,
                                        &parent->notifyd);
                if (req == NULL) {
                        DBG_ERR("Failed to restart notifyd\n");
                        return;
                }
                tevent_req_set_callback(req, notifyd_started, parent);
                return;
        }

        ok = cleanupdb_store_child(pid, unclean_shutdown);
        if (!ok) {
                DBG_ERR("cleanupdb_store_child failed\n");
                return;
        }

        if (!server_id_is_disconnected(&parent->cleanupd)) {
                status = messaging_send(parent->msg_ctx,
                                        parent->cleanupd,
                                        MSG_SMB_NOTIFY_CLEANUP,
                                        &data_blob_null);
                if (!NT_STATUS_IS_OK(status)) {
                        DBG_ERR("messaging_send returned %s\n",
                                nt_errstr(status));
                }
        }
}

/****************************************************************************
 Have we reached the process limit ?
****************************************************************************/

static bool allowable_number_of_smbd_processes(struct smbd_parent_context *parent)
{
        int max_processes = lp_max_smbd_processes();

        if (!max_processes)
                return True;

        return parent->num_children < max_processes;
}

static void smbd_sig_chld_handler(struct tevent_context *ev,
                                  struct tevent_signal *se,
                                  int signum,
                                  int count,
                                  void *siginfo,
                                  void *private_data)
{
        pid_t pid;
        int status;
        struct smbd_parent_context *parent =
                talloc_get_type_abort(private_data,
                struct smbd_parent_context);

        while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
                bool unclean_shutdown = False;

                /* If the child terminated normally, assume
                   it was an unclean shutdown unless the
                   status is 0
                */
                if (WIFEXITED(status)) {
                        unclean_shutdown = WEXITSTATUS(status);
                }
                /* If the child terminated due to a signal
                   we always assume it was unclean.
                */
                if (WIFSIGNALED(status)) {
                        unclean_shutdown = True;
                }
                remove_child_pid(parent, pid, unclean_shutdown);
        }
}

static void smbd_setup_sig_chld_handler(struct smbd_parent_context *parent)
{
        struct tevent_signal *se;

        se = tevent_add_signal(parent->ev_ctx,
                               parent, /* mem_ctx */
                               SIGCHLD, 0,
                               smbd_sig_chld_handler,
                               parent);
        if (!se) {
                exit_server("failed to setup SIGCHLD handler");
        }
}

static void smbd_open_socket_close_fn(struct tevent_context *ev,
                                      struct tevent_fd *fde,
                                      int fd,
                                      void *private_data)
{
        /* this might be the socket_wrapper swrap_close() */
        close(fd);
}

static void smbd_accept_connection(struct tevent_context *ev,
                                   struct tevent_fd *fde,
                                   uint16_t flags,
                                   void *private_data)
{
        struct smbd_open_socket *s = talloc_get_type_abort(private_data,
                                     struct smbd_open_socket);
        struct messaging_context *msg_ctx = s->parent->msg_ctx;
        struct sockaddr_storage addr;
        socklen_t in_addrlen = sizeof(addr);
        int fd;
        pid_t pid = 0;

        fd = accept(s->fd, (struct sockaddr *)(void *)&addr,&in_addrlen);
        if (fd == -1 && errno == EINTR)
                return;

        if (fd == -1) {
                DEBUG(0,("accept: %s\n",
                         strerror(errno)));
                return;
        }
        smb_set_close_on_exec(fd);

        if (s->parent->interactive) {
                NTSTATUS status;

                status = reinit_after_fork(msg_ctx, ev, true);
                if (!NT_STATUS_IS_OK(status)) {
                        exit_server("reinit_after_fork() failed");
                        return;
                }
                smbd_process(ev, msg_ctx, fd, true);
                exit_server_cleanly("end of interactive mode");
                return;
        }

        if (!allowable_number_of_smbd_processes(s->parent)) {
                close(fd);
                return;
        }

        pid = fork();
        if (pid == 0) {
                char addrstr[INET6_ADDRSTRLEN];
                NTSTATUS status = NT_STATUS_OK;

                /*
                 * Can't use TALLOC_FREE here. Nulling out the argument to it
                 * would overwrite memory we've just freed.
                 */
                talloc_free(s->parent);
                s = NULL;

                /* Stop zombies, the parent explicitly handles
                 * them, counting worker smbds. */
                CatchChild();

                status = smbd_reinit_after_fork(msg_ctx, ev, true);
                if (!NT_STATUS_IS_OK(status)) {
                        if (NT_STATUS_EQUAL(status,
                                            NT_STATUS_TOO_MANY_OPENED_FILES)) {
                                DEBUG(0,("child process cannot initialize "
                                         "because too many files are open\n"));
                                goto exit;
                        }
                        if (lp_clustering() &&
                            (NT_STATUS_EQUAL(
                                    status, NT_STATUS_INTERNAL_DB_ERROR) ||
                             NT_STATUS_EQUAL(
                                    status, NT_STATUS_CONNECTION_REFUSED))) {
                                DEBUG(1, ("child process cannot initialize "
                                          "because connection to CTDB "
                                          "has failed: %s\n",
                                          nt_errstr(status)));
                                goto exit;
                        }

                        DEBUG(0,("reinit_after_fork() failed\n"));
                        smb_panic("reinit_after_fork() failed");
                }

                print_sockaddr(addrstr, sizeof(addrstr), &addr);
                process_set_title("smbd[%s]", "client [%s]", addrstr);

                smbd_process(ev, msg_ctx, fd, false);
         exit:
                exit_server_cleanly("end of child");
                return;
        }

        if (pid < 0) {
                DEBUG(0,("smbd_accept_connection: fork() failed: %s\n",
                         strerror(errno)));
        }

        /* The parent doesn't need this socket */
        close(fd);

        /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
                Clear the closed fd info out of server_fd --
                and more importantly, out of client_fd in
                util_sock.c, to avoid a possible
                getpeername failure if we reopen the logs
                and use %I in the filename.
        */

        if (pid != 0) {
                add_child_pid(s->parent, pid);
        }

        /* Force parent to check log size after
         * spawning child.  Fix from
         * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
         * parent smbd will log to logserver.smb.  It
         * writes only two messages for each child
         * started/finished. But each child writes,
         * say, 50 messages also in logserver.smb,
         * beginning with the debug_count of the
         * parent, before the child opens its own log
         * file logserver.client. In a worst case
         * scenario the size of logserver.smb would be
         * checked after about 50*50=2500 messages
         * (ca. 100kb).
         * */
        force_check_log_size();
}

static bool smbd_open_one_socket(struct smbd_parent_context *parent,
                                 struct tevent_context *ev_ctx,
                                 const struct sockaddr_storage *ifss,
                                 uint16_t port)
{
        struct smbd_open_socket *s;

        s = talloc(parent, struct smbd_open_socket);
        if (!s) {
                return false;
        }

        s->parent = parent;

        s->fd = open_socket_in(SOCK_STREAM, ifss, port, true);
        if (s->fd < 0) {
                int err = -(s->fd);
                DBG_ERR("open_socket_in failed: %s\n", strerror(err));
                TALLOC_FREE(s);
                /*
                 * We ignore an error here, as we've done before
                 */
                return true;
        }

        /* ready to listen */
        set_socket_options(s->fd, "SO_KEEPALIVE");
        set_socket_options(s->fd, lp_socket_options());

        /* Set server socket to
         * non-blocking for the accept. */
        set_blocking(s->fd, False);

        if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
                DEBUG(0,("smbd_open_one_socket: listen: "
                        "%s\n", strerror(errno)));
                        close(s->fd);
                TALLOC_FREE(s);
                return false;
        }

        s->fde = tevent_add_fd(ev_ctx,
                               s,
                               s->fd, TEVENT_FD_READ,
                               smbd_accept_connection,
                               s);
        if (!s->fde) {
                DEBUG(0,("smbd_open_one_socket: "
                         "tevent_add_fd: %s\n",
                         strerror(errno)));
                close(s->fd);
                TALLOC_FREE(s);
                return false;
        }
        tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);

        DLIST_ADD_END(parent->sockets, s);

        return true;
}

/****************************************************************************
 Open the socket communication.
****************************************************************************/

static bool open_sockets_smbd(struct smbd_parent_context *parent,
                              struct tevent_context *ev_ctx,
                              struct messaging_context *msg_ctx,
                              const char *smb_ports)
{
        int num_interfaces = iface_count();
        int i,j;
        const char **ports;
        unsigned dns_port = 0;

#ifdef HAVE_ATEXIT
        atexit(killkids);
#endif

        /* Stop zombies */
        smbd_setup_sig_chld_handler(parent);

        ports = lp_smb_ports();

        /* use a reasonable default set of ports - listing on 445 and 139 */
        if (smb_ports) {
                char **l;
                l = str_list_make_v3(talloc_tos(), smb_ports, NULL);
                ports = discard_const_p(const char *, l);
        }

        for (j = 0; ports && ports[j]; j++) {
                unsigned port = atoi(ports[j]);

                if (port == 0 || port > 0xffff) {
                        exit_server_cleanly("Invalid port in the config or on "
                                            "the commandline specified!");
                }
        }

        if (lp_interfaces() && lp_bind_interfaces_only()) {
                /* We have been given an interfaces line, and been
                   told to only bind to those interfaces. Create a
                   socket per interface and bind to only these.
                */

                /* Now open a listen socket for each of the
                   interfaces. */
                for(i = 0; i < num_interfaces; i++) {
                        const struct sockaddr_storage *ifss =
                                        iface_n_sockaddr_storage(i);
                        if (ifss == NULL) {
                                DEBUG(0,("open_sockets_smbd: "
                                        "interface %d has NULL IP address !\n",
                                        i));
                                continue;
                        }

                        for (j = 0; ports && ports[j]; j++) {
                                unsigned port = atoi(ports[j]);

                                /* Keep the first port for mDNS service
                                 * registration.
                                 */
                                if (dns_port == 0) {
                                        dns_port = port;
                                }

                                if (!smbd_open_one_socket(parent,
                                                          ev_ctx,
                                                          ifss,
                                                          port)) {
                                        return false;
                                }
                        }
                }
        } else {
                /* Just bind to 0.0.0.0 - accept connections
                   from anywhere. */

                const char *sock_addr;
                char *sock_tok;
                const char *sock_ptr;

#ifdef HAVE_IPV6
                sock_addr = "::,0.0.0.0";
#else
                sock_addr = "0.0.0.0";
#endif

                for (sock_ptr=sock_addr;
                     next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
                        for (j = 0; ports && ports[j]; j++) {
                                struct sockaddr_storage ss;
                                unsigned port = atoi(ports[j]);

                                /* Keep the first port for mDNS service
                                 * registration.
                                 */
                                if (dns_port == 0) {
                                        dns_port = port;
                                }

                                /* open an incoming socket */
                                if (!interpret_string_addr(&ss, sock_tok,
                                                AI_NUMERICHOST|AI_PASSIVE)) {
                                        continue;
                                }

                                /*
                                 * If we fail to open any sockets
                                 * in this loop the parent-sockets == NULL
                                 * case below will prevent us from starting.
                                 */

                                (void)smbd_open_one_socket(parent,
                                                  ev_ctx,
                                                  &ss,
                                                  port);
                        }
                }
        }

        if (parent->sockets == NULL) {
                DEBUG(0,("open_sockets_smbd: No "
                        "sockets available to bind to.\n"));
                return false;
        }

        /* Listen to messages */

        messaging_register(msg_ctx, NULL, MSG_SHUTDOWN, msg_exit_server);
        messaging_register(msg_ctx, ev_ctx, MSG_SMB_CONF_UPDATED,
                           smbd_parent_conf_updated);
        messaging_register(msg_ctx, NULL, MSG_DEBUG, smbd_msg_debug);
        messaging_register(msg_ctx, NULL, MSG_SMB_FORCE_TDIS,
                           smb_parent_send_to_children);
        messaging_register(msg_ctx, NULL, MSG_SMB_FORCE_TDIS_DENIED,
                           smb_parent_send_to_children);
        messaging_register(msg_ctx, NULL, MSG_SMB_KILL_CLIENT_IP,
                           smb_parent_send_to_children);
        messaging_register(msg_ctx, NULL, MSG_SMB_TELL_NUM_CHILDREN,
                           smb_tell_num_children);

        messaging_register(msg_ctx, NULL,
                           ID_CACHE_DELETE, smbd_parent_id_cache_delete);
        messaging_register(msg_ctx, NULL,
                           ID_CACHE_KILL, smbd_parent_id_cache_kill);
        messaging_register(msg_ctx, NULL, MSG_SMB_NOTIFY_STARTED,
                           smb_parent_send_to_children);

        if (lp_interfaces() && lp_bind_interfaces_only()) {
                messaging_register(msg_ctx,
                                   NULL,
                                   MSG_SMB_IP_DROPPED,
                                   smb_parent_send_to_children);
        }

#ifdef DEVELOPER
        messaging_register(msg_ctx, NULL, MSG_SMB_INJECT_FAULT,
                           msg_inject_fault);
#endif

#if defined(DEVELOPER) || defined(ENABLE_SELFTEST)
        messaging_register(msg_ctx, NULL, MSG_SMB_SLEEP, msg_sleep);
#endif

        if (lp_multicast_dns_register() && (dns_port != 0)) {
#ifdef WITH_DNSSD_SUPPORT
                smbd_setup_mdns_registration(ev_ctx,
                                             parent, dns_port);
#endif
#ifdef WITH_AVAHI_SUPPORT
                void *avahi_conn;

                avahi_conn = avahi_start_register(ev_ctx,
                                                  ev_ctx,
                                                  dns_port);
                if (avahi_conn == NULL) {
                        DEBUG(10, ("avahi_start_register failed\n"));
                }
#endif
        }

        return true;
}


/*
  handle stdin becoming readable when we are in --foreground mode
 */
static void smbd_stdin_handler(struct tevent_context *ev,
                               struct tevent_fd *fde,
                               uint16_t flags,
                               void *private_data)
{
        char c;
        if (read(0, &c, 1) != 1) {
                /* we have reached EOF on stdin, which means the
                   parent has exited. Shutdown the server */
                exit_server_cleanly("EOF on stdin");
        }
}

struct smbd_parent_tevent_trace_state {
        TALLOC_CTX *frame;
};

static void smbd_parent_tevent_trace_callback(enum tevent_trace_point point,
                                              void *private_data)
{
        struct smbd_parent_tevent_trace_state *state =
                (struct smbd_parent_tevent_trace_state *)private_data;

        switch (point) {
        case TEVENT_TRACE_BEFORE_WAIT:
                break;
        case TEVENT_TRACE_AFTER_WAIT:
                break;
        case TEVENT_TRACE_BEFORE_LOOP_ONCE:
                TALLOC_FREE(state->frame);
                state->frame = talloc_stackframe();
                break;
        case TEVENT_TRACE_AFTER_LOOP_ONCE:
                TALLOC_FREE(state->frame);
                break;
        }

        errno = 0;
}

static void smbd_parent_loop(struct tevent_context *ev_ctx,
                             struct smbd_parent_context *parent)
{
        struct smbd_parent_tevent_trace_state trace_state = {
                .frame = NULL,
        };
        int ret = 0;

        tevent_set_trace_callback(ev_ctx, smbd_parent_tevent_trace_callback,
                                  &trace_state);

        /* now accept incoming connections - forking a new process
           for each incoming connection */
        DEBUG(2,("waiting for connections\n"));

        ret = tevent_loop_wait(ev_ctx);
        if (ret != 0) {
                DEBUG(0, ("tevent_loop_wait failed: %d, %s, exiting\n",
                          ret, strerror(errno)));
        }

        TALLOC_FREE(trace_state.frame);

/* NOTREACHED   return True; */
}


/****************************************************************************
 Initialise connect, service and file structs.
****************************************************************************/

static bool init_structs(void )
{
        /*
         * Set the machine NETBIOS name if not already
         * set from the config file.
         */

        if (!secrets_init())
                return False;

        return True;
}

static void smbd_parent_sig_term_handler(struct tevent_context *ev,
                                         struct tevent_signal *se,
                                         int signum,
                                         int count,
                                         void *siginfo,
                                         void *private_data)
{
        exit_server_cleanly("termination signal");
}

static void smbd_parent_sig_hup_handler(struct tevent_context *ev,
                                        struct tevent_signal *se,
                                        int signum,
                                        int count,
                                        void *siginfo,
                                        void *private_data)
{
        change_to_root_user();
        DBG_NOTICE("parent: Reloading services after SIGHUP\n");
        reload_services(NULL, NULL, false);
}

struct smbd_claim_version_state {
        TALLOC_CTX *mem_ctx;
        char *version;
};

static void smbd_claim_version_parser(struct server_id exclusive,
                                      size_t num_shared,
                                      const struct server_id *shared,
                                      const uint8_t *data,
                                      size_t datalen,
                                      void *private_data)
{
        struct smbd_claim_version_state *state = private_data;

        if (datalen == 0) {
                state->version = NULL;
                return;
        }
        if (data[datalen-1] != '\0') {
                DBG_WARNING("Invalid samba version\n");
                dump_data(DBGLVL_WARNING, data, datalen);
                state->version = NULL;
                return;
        }
        state->version = talloc_strdup(state->mem_ctx, (const char *)data);
}

static NTSTATUS smbd_claim_version(struct messaging_context *msg,
                                   const char *version)
{
        const char *name = "samba_version_string";
        const TDB_DATA key = string_term_tdb_data(name);
        struct smbd_claim_version_state state;
        struct g_lock_ctx *ctx;
        NTSTATUS status;

        ctx = g_lock_ctx_init(msg, msg);
        if (ctx == NULL) {
                DBG_WARNING("g_lock_ctx_init failed\n");
                return NT_STATUS_UNSUCCESSFUL;
        }

        status = g_lock_lock(ctx,
                             key,
                             G_LOCK_READ,
                             (struct timeval) { .tv_sec = 60 },
                             NULL,
                             NULL);
        if (!NT_STATUS_IS_OK(status)) {
                DBG_WARNING("g_lock_lock(G_LOCK_READ) failed: %s\n",
                            nt_errstr(status));
                TALLOC_FREE(ctx);
                return status;
        }

        state = (struct smbd_claim_version_state) { .mem_ctx = ctx };

        status = g_lock_dump(ctx, key, smbd_claim_version_parser, &state);
        if (!NT_STATUS_IS_OK(status) &&
            !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
                DBG_ERR("Could not read samba_version_string\n");
                g_lock_unlock(ctx, key);
                TALLOC_FREE(ctx);
                return status;
        }

        if ((state.version != NULL) && (strcmp(version, state.version) == 0)) {
                /*
                 * Leave the read lock for us around. Someone else already
                 * set the version correctly
                 */
                TALLOC_FREE(ctx);
                return NT_STATUS_OK;
        }

        status = g_lock_lock(ctx,
                             key,
                             G_LOCK_UPGRADE,
                             (struct timeval) { .tv_sec = 60 },
                             NULL,
                             NULL);
        if (!NT_STATUS_IS_OK(status)) {
                DBG_WARNING("g_lock_lock(G_LOCK_UPGRADE) failed: %s\n",
                            nt_errstr(status));
                DBG_ERR("smbd %s already running, refusing to start "
                        "version %s\n", state.version, version);
                TALLOC_FREE(ctx);
                return NT_STATUS_SXS_VERSION_CONFLICT;
        }

        status = g_lock_write_data(
                ctx, key, (const uint8_t *)version, strlen(version)+1);
        if (!NT_STATUS_IS_OK(status)) {
                DBG_WARNING("g_lock_write_data failed: %s\n",
                            nt_errstr(status));
                TALLOC_FREE(ctx);
                return status;
        }

        status = g_lock_lock(ctx,
                             key,
                             G_LOCK_DOWNGRADE,
                             (struct timeval) { .tv_sec = 60 },
                             NULL,
                             NULL);
        if (!NT_STATUS_IS_OK(status)) {
                DBG_WARNING("g_lock_lock(G_LOCK_DOWNGRADE) failed: %s\n",
                            nt_errstr(status));
                TALLOC_FREE(ctx);
                return status;
        }

        /*
         * Leave "ctx" dangling so that g_lock.tdb keeps opened.
         */
        return NT_STATUS_OK;
}

/****************************************************************************
 Open socket communication on given ip address
****************************************************************************/

static bool smbd_open_socket_for_ip(struct smbd_parent_context *parent,
                                    struct tevent_context *ev_ctx,
                                    struct messaging_context *msg_ctx,
                                    const char *smb_ports,
                                    const struct sockaddr_storage *ifss)
{
        int j;
        const char **ports;
        unsigned dns_port = 0;
        TALLOC_CTX *ctx;
        bool status = true;

        ports = lp_smb_ports();
        ctx = talloc_stackframe();

        /* use a reasonable default set of ports - listing on 445 and 139 */
        if (smb_ports) {
                char **l;
                l = str_list_make_v3(ctx, smb_ports, NULL);
                ports = discard_const_p(const char *, l);
        }

        for (j = 0; ports && ports[j]; j++) {
                unsigned port = atoi(ports[j]);

                /* Keep the first port for mDNS service
                 * registration.
                 */
                if (dns_port == 0) {
                        dns_port = port;
                }

                if (!smbd_open_one_socket(parent,
                                          ev_ctx,
                                          ifss,
                                          port)) {
                        status = false;
                        goto out_free;
                }
        }

out_free:
        TALLOC_FREE(ctx);
        return status;
}

struct smbd_addrchanged_state {
        struct addrchange_context *ctx;
        struct tevent_context *ev;
        struct messaging_context *msg_ctx;
        struct smbd_parent_context *parent;
        char *ports;
};

static void smbd_addr_changed(struct tevent_req *req);

static void smbd_init_addrchange(TALLOC_CTX *mem_ctx,
                                struct tevent_context *ev,
                                struct messaging_context *msg_ctx,
                                struct smbd_parent_context *parent,
                                char *ports)
{
        struct smbd_addrchanged_state *state;
        struct tevent_req *req;
        NTSTATUS status;

        state = talloc(mem_ctx, struct smbd_addrchanged_state);
        if (state == NULL) {
                DBG_DEBUG("talloc failed\n");
                return;
        }
        *state = (struct smbd_addrchanged_state) {
                .ev = ev,
                .msg_ctx = msg_ctx,
                .parent = parent,
                .ports = ports
        };

        status = addrchange_context_create(state, &state->ctx);
        if (!NT_STATUS_IS_OK(status)) {
                DBG_DEBUG("addrchange_context_create failed: %s\n",
                          nt_errstr(status));
                TALLOC_FREE(state);
                return;
        }
        req = addrchange_send(state, ev, state->ctx);
        if (req == NULL) {
                DBG_ERR("addrchange_send failed\n");
                TALLOC_FREE(state);
                return;
        }
        tevent_req_set_callback(req, smbd_addr_changed, state);
}

static void smbd_close_socket_for_ip(struct smbd_parent_context *parent,
                                     struct messaging_context *msg_ctx,
                                     struct sockaddr_storage *addr)
{
        struct smbd_open_socket *s = NULL;

        for (s = parent->sockets; s != NULL; s = s->next) {
                struct sockaddr_storage a;
                socklen_t addr_len = sizeof(a);

                if (getsockname(s->fd, (struct sockaddr *)&a, &addr_len) < 0) {
                        DBG_NOTICE("smbd: Unable to get address - skip\n");
                        continue;
                }
                if (sockaddr_equal((struct sockaddr *)&a,
                                   (struct sockaddr *)addr)) {
                        char addrstr[INET6_ADDRSTRLEN];
                        DATA_BLOB blob;
                        NTSTATUS status;

                        DLIST_REMOVE(parent->sockets, s);
                        TALLOC_FREE(s);
                        print_sockaddr(addrstr, sizeof(addrstr), addr);
                        DBG_NOTICE("smbd: Closed listening socket for %s\n",
                                   addrstr);

                        blob = data_blob_const(addrstr, strlen(addrstr)+1);
                        status = messaging_send(msg_ctx,
                                                messaging_server_id(msg_ctx),
                                                MSG_SMB_IP_DROPPED,
                                                &blob);
                        if (!NT_STATUS_IS_OK(status)) {
                                DBG_NOTICE(
                                        "messaging_send failed: %s - ignoring\n",
                                        nt_errstr(status));
                        }
                        return;
                }
        }
}

static void smbd_addr_changed(struct tevent_req *req)
{
        struct smbd_addrchanged_state *state = tevent_req_callback_data(
                req, struct smbd_addrchanged_state);
        enum addrchange_type type;
        struct sockaddr_storage addr;
        NTSTATUS status;
        uint32_t if_index;
        bool match;

        status = addrchange_recv(req, &type, &addr, &if_index);
        TALLOC_FREE(req);
        if (!NT_STATUS_IS_OK(status)) {
                DBG_DEBUG("addrchange_recv failed: %s, stop listening\n",
                          nt_errstr(status));
                TALLOC_FREE(state);
                return;
        }

        match = interface_ifindex_exists_with_options(if_index,
                                                      IFACE_DYNAMIC_OPTION);
        if (!match) {
                DBG_NOTICE(
                        "smbd: No interface present for if_index %u "
                        "with dynamic option\n",
                        if_index);
                goto rearm;
        }

        if (type == ADDRCHANGE_DEL) {
                char addrstr[INET6_ADDRSTRLEN];

                print_sockaddr(addrstr, sizeof(addrstr), &addr);

                DBG_NOTICE("smbd: kernel (AF_NETLINK) dropped ip %s "
                           "on if_index %u\n",
                           addrstr, if_index);

                smbd_close_socket_for_ip(state->parent, state->msg_ctx, &addr);

                goto rearm;
        }

        if (type == ADDRCHANGE_ADD) {
                char addrstr[INET6_ADDRSTRLEN];

                print_sockaddr(addrstr, sizeof(addrstr), &addr);

                DBG_NOTICE("smbd: kernel (AF_NETLINK) added ip %s "
                           "on if_index %u\n",
                           addrstr, if_index);

                if (!smbd_open_socket_for_ip(state->parent,
                                             state->ev,
                                             state->msg_ctx,
                                             state->ports,
                                             &addr)) {
                        DBG_NOTICE("smbd: Unable to open socket on %s\n",
                                   addrstr);
                }
        }
rearm:
        req = addrchange_send(state, state->ev, state->ctx);
        if (req == NULL) {
                DBG_ERR("addrchange_send failed\n");
                TALLOC_FREE(state);
                return;
        }
        tevent_req_set_callback(req, smbd_addr_changed, state);
}

/****************************************************************************
 main program.
****************************************************************************/

/* Declare prototype for build_options() to avoid having to run it through
   mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
   prototype generation system is too complicated. */

extern void build_options(bool screen);

 int main(int argc,const char *argv[])
{
        /* shall I run as a daemon */
        struct samba_cmdline_daemon_cfg *cmdline_daemon_cfg = NULL;
        bool log_stdout = false;
        char *ports = NULL;
        char *profile_level = NULL;
        int opt;
        poptContext pc;
        struct server_id main_server_id = {0};
        struct poptOption long_options[] = {
                POPT_AUTOHELP
                {
                        .longName   = "build-options",
                        .shortName  = 'b',
                        .argInfo    = POPT_ARG_NONE,
                        .arg        = NULL,
                        .val        = 'b',
                        .descrip    = "Print build options" ,
                },
                {
                        .longName   = "port",
                        .shortName  = 'p',
                        .argInfo    = POPT_ARG_STRING,
                        .arg        = &ports,
                        .val        = 0,
                        .descrip    = "Listen on the specified ports",
                },
                {
                        .longName   = "profiling-level",
                        .shortName  = 'P',
                        .argInfo    = POPT_ARG_STRING,
                        .arg        = &profile_level,
                        .val        = 0,
                        .descrip    = "Set profiling level","PROFILE_LEVEL",
                },
                POPT_COMMON_SAMBA
                POPT_COMMON_DAEMON
                POPT_COMMON_VERSION
                POPT_TABLEEND
        };
        struct smbd_parent_context *parent = NULL;
        TALLOC_CTX *frame;
        NTSTATUS status;
        struct tevent_context *ev_ctx;
        struct messaging_context *msg_ctx;
        struct server_id server_id;
        struct tevent_signal *se;
        int profiling_level;
        char *np_dir = NULL;
        const struct loadparm_substitution *lp_sub =
                loadparm_s3_global_substitution();
        static const struct smbd_shim smbd_shim_fns =
        {
                .change_to_root_user = smbd_change_to_root_user,
                .become_authenticated_pipe_user = smbd_become_authenticated_pipe_user,
                .unbecome_authenticated_pipe_user = smbd_unbecome_authenticated_pipe_user,

                .contend_level2_oplocks_begin = smbd_contend_level2_oplocks_begin,
                .contend_level2_oplocks_end = smbd_contend_level2_oplocks_end,

                .become_root = smbd_become_root,
                .unbecome_root = smbd_unbecome_root,

                .exit_server = smbd_exit_server,
                .exit_server_cleanly = smbd_exit_server_cleanly,
        };
        bool ok;

        setproctitle_init(argc, discard_const(argv), environ);

        /*
         * Do this before any other talloc operation
         */
        talloc_enable_null_tracking();
        frame = talloc_stackframe();

        smb_init_locale();

        set_smbd_shim(&smbd_shim_fns);

        smbd_init_globals();

        TimeInit();

#ifdef HAVE_SET_AUTH_PARAMETERS
        set_auth_parameters(argc,argv);
#endif

        ok = samba_cmdline_init(frame,
                                SAMBA_CMDLINE_CONFIG_SERVER,
                                true /* require_smbconf */);
        if (!ok) {
                DBG_ERR("Failed to setup cmdline parser!\n");
                exit(ENOMEM);
        }

        cmdline_daemon_cfg = samba_cmdline_get_daemon_cfg();

        pc = samba_popt_get_context(getprogname(),
                                    argc,
                                    argv,
                                    long_options,
                                    0);
        if (pc == NULL) {
                DBG_ERR("Failed to get popt context!\n");
                exit(ENOMEM);
        }

        while((opt = poptGetNextOpt(pc)) != -1) {
                switch (opt)  {
                case 'b':
                        build_options(true); /* Display output to screen as well as debug */
                        exit(0);
                        break;
                default:
                        d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
                                  poptBadOption(pc, 0), poptStrerror(opt));
                        poptPrintUsage(pc, stderr, 0);
                        exit(1);
                }
        }
        poptFreeContext(pc);

        log_stdout = (debug_get_log_type() == DEBUG_STDOUT);

        if (cmdline_daemon_cfg->interactive) {
                log_stdout = True;
        }

#ifdef HAVE_SETLUID
        /* needed for SecureWare on SCO */
        setluid(0);
#endif

        set_remote_machine_name("smbd", False);

        if (cmdline_daemon_cfg->interactive && (DEBUGLEVEL >= 9)) {
                talloc_enable_leak_report();
        }

        if (log_stdout && cmdline_daemon_cfg->fork) {
                DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
                exit(1);
        }

        /*
         * We want to die early if we can't open /dev/urandom
         */
        generate_random_buffer(NULL, 0);

        /* get initial effective uid and gid */
        sec_init();

        /* make absolutely sure we run as root - to handle cases where people
           are crazy enough to have it setuid */
        gain_root_privilege();
        gain_root_group_privilege();

        dump_core_setup("smbd", lp_logfile(talloc_tos(), lp_sub));

        /* we are never interested in SIGPIPE */
        BlockSignals(True,SIGPIPE);

#if defined(SIGFPE)
        /* we are never interested in SIGFPE */
        BlockSignals(True,SIGFPE);
#endif

#if defined(SIGUSR2)
        /* We are no longer interested in USR2 */
        BlockSignals(True,SIGUSR2);
#endif

        /*
         * POSIX demands that signals are inherited. If the invoking
         * process has these signals masked, we will have problems, as
         * we won't receive them.
         */
        BlockSignals(False, SIGHUP);
        BlockSignals(False, SIGUSR1);
        BlockSignals(False, SIGTERM);

        /* Ensure we leave no zombies until we
         * correctly set up child handling below. */

        CatchChild();

        /* we want total control over the permissions on created files,
           so set our umask to 0 */
        umask(0);

        reopen_logs();

        DBG_STARTUP_NOTICE("smbd version %s started.\n%s\n",
                           samba_version_string(),
                           samba_copyright_string());

        DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
                 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));

        /* Output the build options to the debug log */
        build_options(False);

        if (sizeof(uint16_t) < 2 || sizeof(uint32_t) < 4) {
                DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
                exit(1);
        }

        /*
         * This calls unshare(CLONE_FS); on linux
         * in order to check if the running kernel/container
         * environment supports it.
         */
        per_thread_cwd_check();

        if (!cluster_probe_ok()) {
                exit(1);
        }

        /* Init the security context and global current_user */
        init_sec_ctx();

        /*
         * Initialize the event context. The event context needs to be
         * initialized before the messaging context, cause the messaging
         * context holds an event context.
         */
        ev_ctx = global_event_context();
        if (ev_ctx == NULL) {
                exit(1);
        }

        /*
         * Init the messaging context
         * FIXME: This should only call messaging_init()
         */
        msg_ctx = global_messaging_context();
        if (msg_ctx == NULL) {
                exit(1);
        }

        /*
         * Reloading of the printers will not work here as we don't have a
         * server info and rpc services set up. It will be called later.
         */
        if (!reload_services(NULL, NULL, false)) {
                exit(1);
        }

        if (lp_server_role() == ROLE_ACTIVE_DIRECTORY_DC) {
                if (!lp_parm_bool(-1, "server role check", "inhibit", false)) {
                        DBG_ERR("server role = 'active directory domain controller' not compatible with running smbd standalone. \n");
                        DEBUGADD(0, ("You should start 'samba' instead, and it will control starting smbd if required\n"));
                        exit(1);
                }
                /* Main 'samba' daemon will notify */
                daemon_sd_notifications(false);
        }

        /* ...NOTE... Log files are working from this point! */

        DEBUG(3,("loaded services\n"));

        init_structs();

        if (!profile_setup(msg_ctx, False)) {
                DEBUG(0,("ERROR: failed to setup profiling\n"));
                return -1;
        }

        if (profile_level != NULL) {
                profiling_level = atoi(profile_level);
        } else {
                profiling_level = lp_smbd_profiling_level();
        }
        main_server_id = messaging_server_id(msg_ctx);
        set_profile_level(profiling_level, &main_server_id);

        if (!cmdline_daemon_cfg->daemon && !is_a_socket(0)) {
                if (!cmdline_daemon_cfg->interactive) {
                        DEBUG(3, ("Standard input is not a socket, "
                                  "assuming -D option\n"));
                }

                /*
                 * Setting "daemon" here prevents us from eventually calling
                 * the open_sockets_inetd()
                 */

                cmdline_daemon_cfg->daemon = true;
        }

        if (cmdline_daemon_cfg->daemon && !cmdline_daemon_cfg->interactive) {
                DEBUG(3, ("Becoming a daemon.\n"));
                become_daemon(cmdline_daemon_cfg->fork,
                              cmdline_daemon_cfg->no_process_group,
                              log_stdout);
        } else {
                daemon_status("smbd", "Starting process ...");
        }

#ifdef HAVE_SETPGID
        /*
         * If we're interactive we want to set our own process group for
         * signal management.
         */
        if (cmdline_daemon_cfg->interactive &&
            !cmdline_daemon_cfg->no_process_group)
        {
                setpgid( (pid_t)0, (pid_t)0);
        }
#endif

        if (!directory_exist(lp_lock_directory()))
                mkdir(lp_lock_directory(), 0755);

        if (!directory_exist(lp_pid_directory()))
                mkdir(lp_pid_directory(), 0755);

        if (cmdline_daemon_cfg->daemon)
                pidfile_create(lp_pid_directory(), "smbd");

        status = reinit_after_fork(msg_ctx, ev_ctx, false);
        if (!NT_STATUS_IS_OK(status)) {
                exit_daemon("reinit_after_fork() failed", map_errno_from_nt_status(status));
        }

        if (!cmdline_daemon_cfg->interactive) {
                /*
                 * Do not initialize the parent-child-pipe before becoming a
                 * daemon: this is used to detect a died parent in the child
                 * process.
                 */
                status = init_before_fork();
                if (!NT_STATUS_IS_OK(status)) {
                        exit_daemon(nt_errstr(status), map_errno_from_nt_status(status));
                }
        }

        parent = talloc_zero(ev_ctx, struct smbd_parent_context);
        if (!parent) {
                exit_server("talloc(struct smbd_parent_context) failed");
        }
        parent->interactive = cmdline_daemon_cfg->interactive;
        parent->ev_ctx = ev_ctx;
        parent->msg_ctx = msg_ctx;
        am_parent = parent;

        se = tevent_add_signal(parent->ev_ctx,
                               parent,
                               SIGTERM, 0,
                               smbd_parent_sig_term_handler,
                               parent);
        if (!se) {
                exit_server("failed to setup SIGTERM handler");
        }
        se = tevent_add_signal(parent->ev_ctx,
                               parent,
                               SIGHUP, 0,
                               smbd_parent_sig_hup_handler,
                               parent);
        if (!se) {
                exit_server("failed to setup SIGHUP handler");
        }

        /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */

        if (smbd_memcache() == NULL) {
                exit_daemon("no memcache available", EACCES);
        }

        memcache_set_global(smbd_memcache());

        /* Initialise the password backed before the global_sam_sid
           to ensure that we fetch from ldap before we make a domain sid up */

        if(!initialize_password_db(false, ev_ctx))
                exit(1);

        if (!secrets_init()) {
                exit_daemon("smbd can not open secrets.tdb", EACCES);
        }

        if (lp_server_role() == ROLE_DOMAIN_BDC || lp_server_role() == ROLE_DOMAIN_PDC || lp_server_role() == ROLE_IPA_DC) {
                struct loadparm_context *lp_ctx = loadparm_init_s3(NULL, loadparm_s3_helpers());
                if (!open_schannel_session_store(NULL, lp_ctx)) {
                        exit_daemon("ERROR: Samba cannot open schannel store for secured NETLOGON operations.", EACCES);
                }
                TALLOC_FREE(lp_ctx);
        }

        if(!get_global_sam_sid()) {
                exit_daemon("Samba cannot create a SAM SID", EACCES);
        }

        server_id = messaging_server_id(msg_ctx);
        status = smbXsrv_version_global_init(&server_id);
        if (!NT_STATUS_IS_OK(status)) {
                exit_daemon("Samba cannot init server context", EACCES);
        }

        status = smbXsrv_client_global_init();
        if (!NT_STATUS_IS_OK(status)) {
                exit_daemon("Samba cannot init clients context", EACCES);
        }

        status = smbXsrv_session_global_init(msg_ctx);
        if (!NT_STATUS_IS_OK(status)) {
                exit_daemon("Samba cannot init session context", EACCES);
        }

        status = smbXsrv_tcon_global_init();
        if (!NT_STATUS_IS_OK(status)) {
                exit_daemon("Samba cannot init tcon context", EACCES);
        }

        if (!locking_init())
                exit_daemon("Samba cannot init locking", EACCES);

        if (!leases_db_init(false)) {
                exit_daemon("Samba cannot init leases", EACCES);
        }

        if (!smbd_notifyd_init(
                    msg_ctx,
                    cmdline_daemon_cfg->interactive,
                    &parent->notifyd)) {
                exit_daemon("Samba cannot init notification", EACCES);
        }

        if (!cleanupd_init(
                    msg_ctx,
                    cmdline_daemon_cfg->interactive,
                    &parent->cleanupd)) {
                exit_daemon("Samba cannot init the cleanupd", EACCES);
        }

        if (!messaging_parent_dgm_cleanup_init(msg_ctx)) {
                exit(1);
        }

        if (!smbd_scavenger_init(NULL, msg_ctx, ev_ctx)) {
                exit_daemon("Samba cannot init scavenging", EACCES);
        }

        if (!W_ERROR_IS_OK(registry_init_full()))
                exit_daemon("Samba cannot init registry", EACCES);

        /* Open the share_info.tdb here, so we don't have to open
           after the fork on every single connection.  This is a small
           performance improvement and reduces the total number of system
           fds used. */
        status = share_info_db_init();
        if (!NT_STATUS_IS_OK(status)) {
                exit_daemon("ERROR: failed to load share info db.", EACCES);
        }

        status = init_system_session_info(NULL);
        if (!NT_STATUS_IS_OK(status)) {
                DEBUG(1, ("ERROR: failed to setup system user info: %s.\n",
                          nt_errstr(status)));
                return -1;
        }

        if (!init_guest_session_info(NULL)) {
                DEBUG(0,("ERROR: failed to setup guest info.\n"));
                return -1;
        }

        if (!file_init_global()) {
                DEBUG(0, ("ERROR: file_init_global() failed\n"));
                return -1;
        }
        status = smbXsrv_open_global_init();
        if (!NT_STATUS_IS_OK(status)) {
                exit_daemon("Samba cannot init global open", map_errno_from_nt_status(status));
        }

        if (lp_clustering() && !lp_allow_unsafe_cluster_upgrade()) {
                status = smbd_claim_version(msg_ctx, samba_version_string());
                if (!NT_STATUS_IS_OK(status)) {
                        DBG_ERR("Could not claim version: %s\n",
                                    nt_errstr(status));
                        return -1;
                }
        }

        /* This MUST be done before start_epmd() because otherwise
         * start_epmd() forks and races against dcesrv_ep_setup() to
         * call directory_create_or_exist() */
        if (!directory_create_or_exist(lp_ncalrpc_dir(), 0755)) {
                DEBUG(0, ("Failed to create pipe directory %s - %s\n",
                          lp_ncalrpc_dir(), strerror(errno)));
                return -1;
        }

        np_dir = talloc_asprintf(talloc_tos(), "%s/np", lp_ncalrpc_dir());
        if (!np_dir) {
                DEBUG(0, ("%s: Out of memory\n", __location__));
                return -1;
        }

        if (!directory_create_or_exist_strict(np_dir, geteuid(), 0700)) {
                DEBUG(0, ("Failed to create pipe directory %s - %s\n",
                          np_dir, strerror(errno)));
                return -1;
        }

        if (!cmdline_daemon_cfg->interactive) {
                daemon_ready("smbd");
        }

        if (!cmdline_daemon_cfg->daemon) {
                int ret, sock;

                /* inetd mode */
                TALLOC_FREE(frame);

                /* Started from inetd. fd 0 is the socket. */
                /* We will abort gracefully when the client or remote system
                   goes away */
                sock = dup(0);

                /* close stdin, stdout (if not logging to it), but not stderr */
                ret = close_low_fd(0);
                if (ret != 0) {
                        DBG_ERR("close_low_fd(0) failed: %s\n", strerror(ret));
                        return 1;
                }
                if (!debug_get_output_is_stdout()) {
                        ret = close_low_fd(1);
                        if (ret != 0) {
                                DBG_ERR("close_low_fd(1) failed: %s\n",
                                        strerror(ret));
                                return 1;
                        }
                }

#ifdef HAVE_ATEXIT
                atexit(killkids);
#endif

                /* Stop zombies */
                smbd_setup_sig_chld_handler(parent);

                smbd_process(ev_ctx, msg_ctx, sock, true);

                exit_server_cleanly(NULL);
                return(0);
        }

        if (lp_interfaces() && lp_bind_interfaces_only()) {
                smbd_init_addrchange(NULL, ev_ctx, msg_ctx, parent, ports);
        }

        if (!open_sockets_smbd(parent, ev_ctx, msg_ctx, ports))
                exit_server("open_sockets_smbd() failed");

        TALLOC_FREE(frame);
        /* make sure we always have a valid stackframe */
        frame = talloc_stackframe();

        if (!cmdline_daemon_cfg->fork) {
                /* if we are running in the foreground then look for
                   EOF on stdin, and exit if it happens. This allows
                   us to die if the parent process dies
                   Only do this on a pipe or socket, no other device.
                */
                struct stat st;
                if (fstat(0, &st) != 0) {
                        return 1;
                }
                if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) {
                        tevent_add_fd(ev_ctx,
                                        parent,
                                        0,
                                        TEVENT_FD_READ,
                                        smbd_stdin_handler,
                                        NULL);
                }
        }

        smbd_parent_loop(ev_ctx, parent);

        exit_server_cleanly(NULL);
        TALLOC_FREE(frame);
        return(0);
}