source: trunk/server/source3/printing/spoolssd.c

/*
   Unix SMB/Netbios implementation.
   SPOOLSS Daemon
   Copyright (C) Simo Sorce 2010

   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 "serverid.h"
#include "smbd/smbd.h"

#include "messages.h"
#include "include/printing.h"
#include "printing/nt_printing_migrate_internal.h"
#include "ntdomain.h"
#include "librpc/gen_ndr/srv_winreg.h"
#include "librpc/gen_ndr/srv_spoolss.h"
#include "rpc_server/rpc_server.h"
#include "rpc_server/rpc_ep_setup.h"
#include "rpc_server/spoolss/srv_spoolss_nt.h"

#define SPOOLSS_PIPE_NAME "spoolss"
#define DAEMON_NAME "spoolssd"

void start_spoolssd(struct tevent_context *ev_ctx,
                    struct messaging_context *msg_ctx);

static void spoolss_reopen_logs(void)
{
        char *lfile = lp_logfile();
        int rc;

        if (lfile == NULL || lfile[0] == '\0') {
                rc = asprintf(&lfile, "%s/log.%s", get_dyn_LOGFILEBASE(), DAEMON_NAME);
                if (rc > 0) {
                        lp_set_logfile(lfile);
                        SAFE_FREE(lfile);
                }
        } else {
                if (strstr(lfile, DAEMON_NAME) == NULL) {
                        rc = asprintf(&lfile, "%s.%s", lp_logfile(), DAEMON_NAME);
                        if (rc > 0) {
                                lp_set_logfile(lfile);
                                SAFE_FREE(lfile);
                        }
                }
        }

        reopen_logs();
}

static void smb_conf_updated(struct messaging_context *msg,
                             void *private_data,
                             uint32_t msg_type,
                             struct server_id server_id,
                             DATA_BLOB *data)
{
        struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
                                                             struct tevent_context);

        DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
        change_to_root_user();
        spoolss_reopen_logs();
}

static void spoolss_pcap_updated(struct messaging_context *msg,
                                 void *private_data,
                                 uint32_t msg_type,
                                 struct server_id server_id,
                                 DATA_BLOB *data)
{
        struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
                                                             struct tevent_context);

        DEBUG(10, ("Got message saying pcap was updated. Reloading.\n"));
        change_to_root_user();
        reload_printers(ev_ctx, msg);
}

static void spoolss_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 spoolss_setup_sig_term_handler(struct tevent_context *ev_ctx)
{
        struct tevent_signal *se;

        se = tevent_add_signal(ev_ctx,
                               ev_ctx,
                               SIGTERM, 0,
                               spoolss_sig_term_handler,
                               NULL);
        if (!se) {
                exit_server("failed to setup SIGTERM handler");
        }
}

static void spoolss_sig_hup_handler(struct tevent_context *ev,
                                    struct tevent_signal *se,
                                    int signum,
                                    int count,
                                    void *siginfo,
                                    void *private_data)
{
        struct messaging_context *msg_ctx = talloc_get_type_abort(private_data,
                                                                  struct messaging_context);

        change_to_root_user();
        DEBUG(1,("Reloading printers after SIGHUP\n"));
        spoolss_reopen_logs();
}

static void spoolss_setup_sig_hup_handler(struct tevent_context *ev_ctx,
                                          struct messaging_context *msg_ctx)
{
        struct tevent_signal *se;

        se = tevent_add_signal(ev_ctx,
                               ev_ctx,
                               SIGHUP, 0,
                               spoolss_sig_hup_handler,
                               msg_ctx);
        if (!se) {
                exit_server("failed to setup SIGHUP handler");
        }
}

static bool spoolss_init_cb(void *ptr)
{
        struct messaging_context *msg_ctx = talloc_get_type_abort(
                ptr, struct messaging_context);

        return nt_printing_tdb_migrate(msg_ctx);
}

static bool spoolss_shutdown_cb(void *ptr)
{
        srv_spoolss_cleanup();

        return true;
}

void start_spoolssd(struct tevent_context *ev_ctx,
                    struct messaging_context *msg_ctx)
{
        struct rpc_srv_callbacks spoolss_cb;
        pid_t pid;
        NTSTATUS status;
        int ret;

        DEBUG(1, ("Forking SPOOLSS Daemon\n"));

        pid = sys_fork();

        if (pid == -1) {
                DEBUG(0, ("Failed to fork SPOOLSS [%s], aborting ...\n",
                           strerror(errno)));
                exit(1);
        }

        if (pid) {
                /* parent */
                return;
        }

        /* child */
        close_low_fds(false);

        status = reinit_after_fork(msg_ctx,
                                   ev_ctx,
                                   procid_self(), true);
        if (!NT_STATUS_IS_OK(status)) {
                DEBUG(0,("reinit_after_fork() failed\n"));
                smb_panic("reinit_after_fork() failed");
        }

        spoolss_reopen_logs();

        spoolss_setup_sig_term_handler(ev_ctx);
        spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);

        if (!serverid_register(procid_self(),
                                FLAG_MSG_GENERAL|FLAG_MSG_SMBD
                                |FLAG_MSG_PRINT_GENERAL)) {
                exit(1);
        }

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

        messaging_register(msg_ctx, NULL,
                           MSG_PRINTER_UPDATE, print_queue_receive);
        messaging_register(msg_ctx, ev_ctx,
                           MSG_SMB_CONF_UPDATED, smb_conf_updated);
        messaging_register(msg_ctx, ev_ctx,
                           MSG_PRINTER_PCAP, spoolss_pcap_updated);

        /*
         * Initialize spoolss with an init function to convert printers first.
         * static_init_rpc will try to initialize the spoolss server too but you
         * can't register it twice.
         */
        spoolss_cb.init = spoolss_init_cb;
        spoolss_cb.shutdown = spoolss_shutdown_cb;
        spoolss_cb.private_data = msg_ctx;

        status = rpc_winreg_init(NULL);
        if (!NT_STATUS_IS_OK(status)) {
                DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
                          nt_errstr(status)));
                exit(1);
        }

        status = rpc_spoolss_init(&spoolss_cb);
        if (!NT_STATUS_IS_OK(status)) {
                DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
                          nt_errstr(status)));
                exit(1);
        }

        if (!setup_named_pipe_socket(SPOOLSS_PIPE_NAME, ev_ctx)) {
                exit(1);
        }

        status = rpc_ep_setup_register(ev_ctx, msg_ctx, &ndr_table_spoolss, NULL, 0);
        if (!NT_STATUS_IS_OK(status)) {
                DEBUG(0, ("Failed to register spoolss endpoint! (%s)\n",
                          nt_errstr(status)));
                exit(1);
        }

        DEBUG(1, ("SPOOLSS Daemon Started (%d)\n", getpid()));

        /* loop forever */
        ret = tevent_loop_wait(ev_ctx);

        /* should not be reached */
        DEBUG(0,("background_queue: tevent_loop_wait() exited with %d - %s\n",
                 ret, (ret == 0) ? "out of events" : strerror(errno)));
        exit(1);
}