mirror of
https://github.com/samba-team/samba.git
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abae5889d9
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Ralph Boehme <slow@samba.org>
697 lines
17 KiB
C
697 lines
17 KiB
C
/*
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* Unix SMB/CIFS implementation.
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*
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* mds service daemon
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*
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* Copyright (c) 2014 Ralph Boehme <rb@sernet.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "messages.h"
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#include "ntdomain.h"
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#include "lib/id_cache.h"
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#include "../lib/tsocket/tsocket.h"
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#include "lib/server_prefork.h"
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#include "lib/server_prefork_util.h"
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#include "librpc/rpc/dcerpc_ep.h"
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#include "librpc/rpc/dcesrv_core.h"
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#include "rpc_server/rpc_server.h"
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#include "rpc_server/rpc_service_setup.h"
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#include "rpc_server/rpc_ep_register.h"
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#include "rpc_server/rpc_sock_helper.h"
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#include "rpc_server/rpc_modules.h"
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#include "rpc_server/mdssvc/srv_mdssvc_nt.h"
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#include "rpc_server/mdssd.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_RPC_SRV
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#define DAEMON_NAME "mdssd"
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#define MDSSD_MAX_SOCKETS 64
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static struct server_id parent_id;
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static struct prefork_pool *mdssd_pool = NULL;
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static int mdssd_child_id = 0;
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static struct pf_daemon_config default_pf_mdssd_cfg = {
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.prefork_status = PFH_INIT,
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.min_children = 5,
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.max_children = 25,
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.spawn_rate = 5,
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.max_allowed_clients = 1000,
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.child_min_life = 60 /* 1 minute minimum life time */
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};
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static struct pf_daemon_config pf_mdssd_cfg = { 0 };
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static void mdssd_smb_conf_updated(struct messaging_context *msg,
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void *private_data,
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uint32_t msg_type,
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struct server_id server_id,
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DATA_BLOB *data)
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{
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struct tevent_context *ev_ctx;
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DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
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ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
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change_to_root_user();
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lp_load_global(get_dyn_CONFIGFILE());
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reopen_logs();
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if (mdssd_child_id == 0) {
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pfh_daemon_config(DAEMON_NAME,
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&pf_mdssd_cfg,
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&default_pf_mdssd_cfg);
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pfh_manage_pool(ev_ctx, msg, &pf_mdssd_cfg, mdssd_pool);
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}
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}
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static void mdssd_sig_term_handler(struct tevent_context *ev,
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struct tevent_signal *se,
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int signum,
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int count,
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void *siginfo,
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void *private_data)
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{
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exit_server_cleanly("termination signal");
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}
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static void mdssd_setup_sig_term_handler(struct tevent_context *ev_ctx)
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{
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struct tevent_signal *se;
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se = tevent_add_signal(ev_ctx,
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ev_ctx,
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SIGTERM, 0,
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mdssd_sig_term_handler,
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NULL);
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if (!se) {
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exit_server("failed to setup SIGTERM handler");
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}
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}
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static void mdssd_sig_hup_handler(struct tevent_context *ev,
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struct tevent_signal *se,
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int signum,
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int count,
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void *siginfo,
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void *pvt)
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{
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change_to_root_user();
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lp_load_global(get_dyn_CONFIGFILE());
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reopen_logs();
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pfh_daemon_config(DAEMON_NAME,
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&pf_mdssd_cfg,
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&default_pf_mdssd_cfg);
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/* relay to all children */
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prefork_send_signal_to_all(mdssd_pool, SIGHUP);
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}
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static void mdssd_setup_sig_hup_handler(struct tevent_context *ev_ctx)
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{
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struct tevent_signal *se;
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se = tevent_add_signal(ev_ctx,
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ev_ctx,
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SIGHUP, 0,
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mdssd_sig_hup_handler,
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NULL);
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if (!se) {
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DEBUG(0, ("failed to setup SIGHUP handler\n"));
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exit(1);
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}
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}
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/**********************************************************
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* Children
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**********************************************************/
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static void mdssd_chld_sig_hup_handler(struct tevent_context *ev,
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struct tevent_signal *se,
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int signum,
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int count,
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void *siginfo,
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void *pvt)
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{
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change_to_root_user();
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reopen_logs();
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}
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static bool mdssd_setup_chld_hup_handler(struct tevent_context *ev_ctx)
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{
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struct tevent_signal *se;
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se = tevent_add_signal(ev_ctx,
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ev_ctx,
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SIGHUP, 0,
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mdssd_chld_sig_hup_handler,
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NULL);
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if (!se) {
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DEBUG(1, ("failed to setup SIGHUP handler"));
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return false;
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}
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return true;
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}
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static void parent_ping(struct messaging_context *msg_ctx,
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void *private_data,
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uint32_t msg_type,
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struct server_id server_id,
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DATA_BLOB *data)
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{
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/*
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* The fact we received this message is enough to let make the
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* event loop if it was idle. mdssd_children_main will cycle
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* through mdssd_next_client at least once. That function will
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* take whatever action is necessary
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*/
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DEBUG(10, ("Got message that the parent changed status.\n"));
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return;
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}
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static bool mdssd_child_init(struct tevent_context *ev_ctx,
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int child_id,
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struct pf_worker_data *pf)
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{
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NTSTATUS status;
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struct messaging_context *msg_ctx = global_messaging_context();
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bool ok;
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status = reinit_after_fork(msg_ctx, ev_ctx,
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true, "mdssd-child");
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0,("reinit_after_fork() failed\n"));
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smb_panic("reinit_after_fork() failed");
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}
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mdssd_child_id = child_id;
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reopen_logs();
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ok = mdssd_setup_chld_hup_handler(ev_ctx);
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if (!ok) {
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return false;
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}
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messaging_register(msg_ctx, ev_ctx,
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MSG_SMB_CONF_UPDATED, mdssd_smb_conf_updated);
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messaging_register(msg_ctx, ev_ctx,
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MSG_PREFORK_PARENT_EVENT, parent_ping);
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return true;
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}
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struct mdssd_children_data {
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struct tevent_context *ev_ctx;
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struct messaging_context *msg_ctx;
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struct dcesrv_context *dce_ctx;
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struct pf_worker_data *pf;
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int listen_fd_size;
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struct pf_listen_fd *listen_fds;
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};
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static void mdssd_next_client(void *pvt);
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static int mdssd_children_main(struct tevent_context *ev_ctx,
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struct messaging_context *msg_ctx,
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struct pf_worker_data *pf,
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int child_id,
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int listen_fd_size,
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struct pf_listen_fd *listen_fds,
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void *private_data)
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{
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struct mdssd_children_data *data;
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bool ok;
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int ret = 0;
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struct dcesrv_context *dce_ctx = NULL;
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dce_ctx = talloc_get_type_abort(private_data, struct dcesrv_context);
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ok = mdssd_child_init(ev_ctx, child_id, pf);
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if (!ok) {
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return 1;
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}
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data = talloc(ev_ctx, struct mdssd_children_data);
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if (!data) {
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return 1;
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}
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data->pf = pf;
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data->ev_ctx = ev_ctx;
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data->msg_ctx = msg_ctx;
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data->dce_ctx = dce_ctx;
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data->listen_fd_size = listen_fd_size;
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data->listen_fds = listen_fds;
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/* loop until it is time to exit */
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while (pf->status != PF_WORKER_EXITING) {
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/* try to see if it is time to schedule the next client */
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mdssd_next_client(data);
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ret = tevent_loop_once(ev_ctx);
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if (ret != 0) {
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DEBUG(0, ("tevent_loop_once() exited with %d: %s\n",
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ret, strerror(errno)));
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pf->status = PF_WORKER_EXITING;
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}
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}
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return ret;
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}
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static void mdssd_client_terminated(struct dcesrv_connection *conn, void *pvt)
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{
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struct mdssd_children_data *data;
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data = talloc_get_type_abort(pvt, struct mdssd_children_data);
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pfh_client_terminated(data->pf);
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mdssd_next_client(pvt);
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}
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struct mdssd_new_client {
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struct mdssd_children_data *data;
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};
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static void mdssd_handle_client(struct tevent_req *req);
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static void mdssd_next_client(void *pvt)
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{
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struct tevent_req *req;
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struct mdssd_children_data *data;
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struct mdssd_new_client *next;
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data = talloc_get_type_abort(pvt, struct mdssd_children_data);
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if (!pfh_child_allowed_to_accept(data->pf)) {
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/* nothing to do for now we are already listening
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* or we are not allowed to listen further */
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return;
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}
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next = talloc_zero(data, struct mdssd_new_client);
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if (!next) {
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DEBUG(1, ("Out of memory!?\n"));
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return;
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}
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next->data = data;
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req = prefork_listen_send(next,
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data->ev_ctx,
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data->pf,
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data->listen_fd_size,
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data->listen_fds);
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if (!req) {
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DEBUG(1, ("Failed to make listening request!?\n"));
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talloc_free(next);
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return;
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}
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tevent_req_set_callback(req, mdssd_handle_client, next);
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}
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static void mdssd_handle_client(struct tevent_req *req)
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{
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struct mdssd_children_data *data;
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struct mdssd_new_client *client;
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const DATA_BLOB ping = data_blob_null;
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int rc;
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int sd;
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TALLOC_CTX *tmp_ctx;
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struct tsocket_address *srv_addr;
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struct tsocket_address *cli_addr;
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void *listen_fd_data = NULL;
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struct dcesrv_endpoint *ep = NULL;
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enum dcerpc_transport_t transport;
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dcerpc_ncacn_termination_fn term_fn = NULL;
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void *term_fn_data = NULL;
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client = tevent_req_callback_data(req, struct mdssd_new_client);
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data = client->data;
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tmp_ctx = talloc_stackframe();
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if (tmp_ctx == NULL) {
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DEBUG(1, ("Failed to allocate stackframe!\n"));
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return;
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}
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rc = prefork_listen_recv(req,
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tmp_ctx,
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&sd,
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&listen_fd_data,
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&srv_addr,
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&cli_addr);
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/* this will free the request too */
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talloc_free(client);
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if (rc != 0) {
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DEBUG(6, ("No client connection was available after all!\n"));
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goto done;
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}
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ep = talloc_get_type_abort(listen_fd_data, struct dcesrv_endpoint);
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transport = dcerpc_binding_get_transport(ep->ep_description);
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if (transport == NCACN_NP) {
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term_fn = mdssd_client_terminated;
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term_fn_data = data;
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}
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/* Warn parent that our status changed */
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messaging_send(data->msg_ctx, parent_id,
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MSG_PREFORK_CHILD_EVENT, &ping);
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DBG_INFO("MDSSD preforked child %d got client connection on '%s'\n",
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(int)(data->pf->pid), dcerpc_binding_string(tmp_ctx,
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ep->ep_description));
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dcerpc_ncacn_accept(data->ev_ctx,
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data->msg_ctx,
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data->dce_ctx,
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ep,
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cli_addr,
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srv_addr,
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sd,
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term_fn,
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term_fn_data);
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done:
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talloc_free(tmp_ctx);
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}
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/*
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* MAIN
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*/
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static void child_ping(struct messaging_context *msg_ctx,
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void *private_data,
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uint32_t msg_type,
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struct server_id server_id,
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DATA_BLOB *data)
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{
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struct tevent_context *ev_ctx;
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ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
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DEBUG(10, ("Got message that a child changed status.\n"));
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pfh_manage_pool(ev_ctx, msg_ctx, &pf_mdssd_cfg, mdssd_pool);
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}
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static bool mdssd_schedule_check(struct tevent_context *ev_ctx,
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struct messaging_context *msg_ctx,
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struct timeval current_time);
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static void mdssd_check_children(struct tevent_context *ev_ctx,
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struct tevent_timer *te,
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struct timeval current_time,
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void *pvt);
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static void mdssd_sigchld_handler(struct tevent_context *ev_ctx,
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struct prefork_pool *pfp,
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void *pvt)
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{
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struct messaging_context *msg_ctx;
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msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
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/* run pool management so we can fork/retire or increase
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* the allowed connections per child based on load */
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pfh_manage_pool(ev_ctx, msg_ctx, &pf_mdssd_cfg, mdssd_pool);
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}
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static bool mdssd_setup_children_monitor(struct tevent_context *ev_ctx,
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struct messaging_context *msg_ctx)
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{
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bool ok;
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/* add our oun sigchld callback */
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prefork_set_sigchld_callback(mdssd_pool, mdssd_sigchld_handler, msg_ctx);
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ok = mdssd_schedule_check(ev_ctx, msg_ctx, tevent_timeval_current());
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return ok;
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}
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static bool mdssd_schedule_check(struct tevent_context *ev_ctx,
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struct messaging_context *msg_ctx,
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struct timeval current_time)
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{
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struct tevent_timer *te;
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struct timeval next_event;
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/* check situation again in 10 seconds */
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next_event = tevent_timeval_current_ofs(10, 0);
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/* TODO: check when the socket becomes readable, so that children
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* are checked only when there is some activity ? */
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te = tevent_add_timer(ev_ctx, mdssd_pool, next_event,
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mdssd_check_children, msg_ctx);
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if (!te) {
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DEBUG(2, ("Failed to set up children monitoring!\n"));
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return false;
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}
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return true;
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}
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static void mdssd_check_children(struct tevent_context *ev_ctx,
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struct tevent_timer *te,
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struct timeval current_time,
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void *pvt)
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{
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struct messaging_context *msg_ctx;
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msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
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pfh_manage_pool(ev_ctx, msg_ctx, &pf_mdssd_cfg, mdssd_pool);
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mdssd_schedule_check(ev_ctx, msg_ctx, current_time);
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}
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/*
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* start it up
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*/
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static NTSTATUS mdssd_create_sockets(struct tevent_context *ev_ctx,
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struct messaging_context *msg_ctx,
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struct dcesrv_context *dce_ctx,
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struct pf_listen_fd *listen_fd,
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int *listen_fd_size)
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{
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NTSTATUS status;
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int fd = -1;
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int rc;
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int i;
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struct dcesrv_endpoint *e = NULL;
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DBG_INFO("Initializing DCE/RPC connection endpoints\n");
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for (e = dce_ctx->endpoint_list; e; e = e->next) {
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status = dcesrv_create_endpoint_sockets(ev_ctx,
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msg_ctx,
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dce_ctx,
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e,
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listen_fd,
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listen_fd_size);
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if (!NT_STATUS_IS_OK(status)) {
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char *ep_string = dcerpc_binding_string(
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dce_ctx, e->ep_description);
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DBG_ERR("Failed to create endpoint '%s': %s\n",
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ep_string, nt_errstr(status));
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TALLOC_FREE(ep_string);
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goto done;
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}
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}
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for (i = 0; i < *listen_fd_size; i++) {
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rc = listen(listen_fd[i].fd, pf_mdssd_cfg.max_allowed_clients);
|
|
if (rc == -1) {
|
|
char *ep_string = dcerpc_binding_string(
|
|
dce_ctx, e->ep_description);
|
|
DBG_ERR("Failed to listen on endpoint '%s': %s\n",
|
|
ep_string, strerror(errno));
|
|
status = map_nt_error_from_unix(errno);
|
|
TALLOC_FREE(ep_string);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
for (e = dce_ctx->endpoint_list; e; e = e->next) {
|
|
struct dcesrv_if_list *ifl = NULL;
|
|
for (ifl = e->interface_list; ifl; ifl = ifl->next) {
|
|
status = rpc_ep_register(ev_ctx,
|
|
msg_ctx,
|
|
dce_ctx,
|
|
ifl->iface);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DBG_ERR("Failed to register interface in "
|
|
"endpoint mapper: %s",
|
|
nt_errstr(status));
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
|
|
status = NT_STATUS_OK;
|
|
done:
|
|
if (fd != -1) {
|
|
close(fd);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
void start_mdssd(struct tevent_context *ev_ctx,
|
|
struct messaging_context *msg_ctx,
|
|
struct dcesrv_context *dce_ctx)
|
|
{
|
|
NTSTATUS status;
|
|
struct pf_listen_fd listen_fd[MDSSD_MAX_SOCKETS];
|
|
int listen_fd_size = 0;
|
|
pid_t pid;
|
|
int rc;
|
|
bool ok;
|
|
|
|
DEBUG(1, ("Forking Metadata Service Daemon\n"));
|
|
|
|
/*
|
|
* Block signals before forking child as it will have to
|
|
* set its own handlers. Child will re-enable SIGHUP as
|
|
* soon as the handlers are set up.
|
|
*/
|
|
BlockSignals(true, SIGTERM);
|
|
BlockSignals(true, SIGHUP);
|
|
|
|
pid = fork();
|
|
if (pid == -1) {
|
|
DEBUG(0, ("Failed to fork mdssd [%s], aborting ...\n",
|
|
strerror(errno)));
|
|
exit(1);
|
|
}
|
|
|
|
/* parent or error */
|
|
if (pid != 0) {
|
|
|
|
/* Re-enable SIGHUP before returnig */
|
|
BlockSignals(false, SIGTERM);
|
|
BlockSignals(false, SIGHUP);
|
|
|
|
return;
|
|
}
|
|
|
|
status = smbd_reinit_after_fork(msg_ctx, ev_ctx, true, "mdssd-master");
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0,("reinit_after_fork() failed\n"));
|
|
smb_panic("reinit_after_fork() failed");
|
|
}
|
|
|
|
reopen_logs();
|
|
|
|
/* save the parent process id so the children can use it later */
|
|
parent_id = messaging_server_id(msg_ctx);
|
|
|
|
pfh_daemon_config(DAEMON_NAME,
|
|
&pf_mdssd_cfg,
|
|
&default_pf_mdssd_cfg);
|
|
|
|
mdssd_setup_sig_term_handler(ev_ctx);
|
|
mdssd_setup_sig_hup_handler(ev_ctx);
|
|
|
|
BlockSignals(false, SIGTERM);
|
|
BlockSignals(false, SIGHUP);
|
|
|
|
/* The module setup function will register the endpoint server,
|
|
* necessary to setup the endpoints below. It is not possible to
|
|
* register it here because MDS service is built as a module.
|
|
*/
|
|
ok = setup_rpc_module(ev_ctx, msg_ctx, "mdssvc");
|
|
if (!ok) {
|
|
DBG_ERR("Failed to setup DCE/RPC module\n");
|
|
exit(1);
|
|
}
|
|
|
|
DBG_INFO("Reinitializing DCE/RPC server context\n");
|
|
|
|
status = dcesrv_reinit_context(dce_ctx);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DBG_ERR("Failed to reinit DCE/RPC context: %s\n",
|
|
nt_errstr(status));
|
|
exit(1);
|
|
}
|
|
|
|
DBG_INFO("Initializing DCE/RPC registered endpoint servers\n");
|
|
|
|
/* Init ep servers */
|
|
status = dcesrv_init_ep_server(dce_ctx, "mdssvc");
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DBG_ERR("Failed to init DCE/RPC endpoint server: %s\n",
|
|
nt_errstr(status));
|
|
exit(1);
|
|
}
|
|
|
|
status = mdssd_create_sockets(ev_ctx,
|
|
msg_ctx,
|
|
dce_ctx,
|
|
listen_fd,
|
|
&listen_fd_size);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
exit(1);
|
|
}
|
|
|
|
/* start children before any more initialization is done */
|
|
ok = prefork_create_pool(ev_ctx, /* mem_ctx */
|
|
ev_ctx,
|
|
msg_ctx,
|
|
listen_fd_size,
|
|
listen_fd,
|
|
pf_mdssd_cfg.min_children,
|
|
pf_mdssd_cfg.max_children,
|
|
&mdssd_children_main,
|
|
dce_ctx,
|
|
&mdssd_pool);
|
|
if (!ok) {
|
|
exit(1);
|
|
}
|
|
|
|
messaging_register(msg_ctx,
|
|
ev_ctx,
|
|
MSG_SMB_CONF_UPDATED,
|
|
mdssd_smb_conf_updated);
|
|
messaging_register(msg_ctx, ev_ctx,
|
|
MSG_PREFORK_CHILD_EVENT, child_ping);
|
|
|
|
ok = mdssd_setup_children_monitor(ev_ctx, msg_ctx);
|
|
if (!ok) {
|
|
exit(1);
|
|
}
|
|
|
|
DEBUG(1, ("mdssd Daemon Started (%u)\n", (unsigned int)getpid()));
|
|
|
|
/* loop forever */
|
|
rc = tevent_loop_wait(ev_ctx);
|
|
|
|
/* should not be reached */
|
|
DEBUG(0,("mdssd: tevent_loop_wait() exited with %d - %s\n",
|
|
rc, (rc == 0) ? "out of events" : strerror(errno)));
|
|
exit(1);
|
|
}
|