source3/printing/spoolssd.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    SPOOLSS Daemon
   4    Copyright (C) Simo Sorce 2010
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19 #include "includes.h"
  20 #include "serverid.h"
  21
  22 #include "librpc/gen_ndr/messaging.h"
  23 #include "include/printing.h"
  24 #include "printing/nt_printing_migrate.h"
  25 #include "librpc/gen_ndr/srv_winreg.h"
  26 #include "librpc/gen_ndr/srv_spoolss.h"
  27 #include "rpc_server/rpc_server.h"
  28
  29 #define SPOOLSS_PIPE_NAME "spoolss"
  30 #define DAEMON_NAME "spoolssd"
  31
  32 void start_spoolssd(struct tevent_context *ev_ctx,
  33                     struct messaging_context *msg_ctx);
  34
  35 static void spoolss_reopen_logs(void)
  36 {
  37         char *lfile = lp_logfile();
  38         int rc;
  39
  40         if (strstr(lfile, DAEMON_NAME) == NULL) {
  41                 rc = asprintf(&lfile, "%s.%s", lp_logfile(), DAEMON_NAME);
  42                 if (rc > 0) {
  43                         lp_set_logfile(lfile);
  44                         SAFE_FREE(lfile);
  45                 }
  46         }
  47         reopen_logs();
  48 }
  49
  50 static void smb_conf_updated(struct messaging_context *msg,
  51                              void *private_data,
  52                              uint32_t msg_type,
  53                              struct server_id server_id,
  54                              DATA_BLOB *data)
  55 {
  56         struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
  57                                                              struct tevent_context);
  58
  59         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
  60         change_to_root_user();
  61         reload_printers(ev_ctx, msg);
  62         spoolss_reopen_logs();
  63 }
  64
  65 static void spoolss_sig_term_handler(struct tevent_context *ev,
  66                                      struct tevent_signal *se,
  67                                      int signum,
  68                                      int count,
  69                                      void *siginfo,
  70                                      void *private_data)
  71 {
  72         exit_server_cleanly("termination signal");
  73 }
  74
  75 static void spoolss_setup_sig_term_handler(struct tevent_context *ev_ctx)
  76 {
  77         struct tevent_signal *se;
  78
  79         se = tevent_add_signal(ev_ctx,
  80                                ev_ctx,
  81                                SIGTERM, 0,
  82                                spoolss_sig_term_handler,
  83                                NULL);
  84         if (!se) {
  85                 exit_server("failed to setup SIGTERM handler");
  86         }
  87 }
  88
  89 static void spoolss_sig_hup_handler(struct tevent_context *ev,
  90                                     struct tevent_signal *se,
  91                                     int signum,
  92                                     int count,
  93                                     void *siginfo,
  94                                     void *private_data)
  95 {
  96         struct messaging_context *msg_ctx = talloc_get_type_abort(private_data,
  97                                                                   struct messaging_context);
  98
  99         change_to_root_user();
 100         DEBUG(1,("Reloading printers after SIGHUP\n"));
 101         reload_printers(ev, msg_ctx);
 102         spoolss_reopen_logs();
 103 }
 104
 105 static void spoolss_setup_sig_hup_handler(struct tevent_context *ev_ctx,
 106                                           struct messaging_context *msg_ctx)
 107 {
 108         struct tevent_signal *se;
 109
 110         se = tevent_add_signal(ev_ctx,
 111                                ev_ctx,
 112                                SIGHUP, 0,
 113                                spoolss_sig_hup_handler,
 114                                msg_ctx);
 115         if (!se) {
 116                 exit_server("failed to setup SIGHUP handler");
 117         }
 118 }
 119
 120 static bool spoolss_init_cb(void *ptr)
 121 {
 122         struct messaging_context *msg_ctx = talloc_get_type_abort(
 123                 ptr, struct messaging_context);
 124
 125         return nt_printing_tdb_migrate(msg_ctx);
 126 }
 127
 128 static bool spoolss_shutdown_cb(void *ptr)
 129 {
 130         srv_spoolss_cleanup();
 131
 132         return true;
 133 }
 134
 135 void start_spoolssd(struct tevent_context *ev_ctx,
 136                     struct messaging_context *msg_ctx)
 137 {
 138         struct rpc_srv_callbacks spoolss_cb;
 139         pid_t pid;
 140         NTSTATUS status;
 141         int ret;
 142
 143         DEBUG(1, ("Forking SPOOLSS Daemon\n"));
 144
 145         pid = sys_fork();
 146
 147         if (pid == -1) {
 148                 DEBUG(0, ("Failed to fork SPOOLSS [%s], aborting ...\n",
 149                            strerror(errno)));
 150                 exit(1);
 151         }
 152
 153         if (pid) {
 154                 /* parent */
 155                 return;
 156         }
 157
 158         /* child */
 159         close_low_fds(false);
 160
 161         status = reinit_after_fork(msg_ctx,
 162                                    ev_ctx,
 163                                    procid_self(), true);
 164         if (!NT_STATUS_IS_OK(status)) {
 165                 DEBUG(0,("reinit_after_fork() failed\n"));
 166                 smb_panic("reinit_after_fork() failed");
 167         }
 168
 169         spoolss_reopen_logs();
 170
 171         spoolss_setup_sig_term_handler(ev_ctx);
 172         spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);
 173
 174         if (!serverid_register(procid_self(),
 175                                 FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 176                                 |FLAG_MSG_PRINT_GENERAL)) {
 177                 exit(1);
 178         }
 179
 180         if (!locking_init()) {
 181                 exit(1);
 182         }
 183
 184         messaging_register(msg_ctx, NULL,
 185                            MSG_PRINTER_UPDATE, print_queue_receive);
 186         messaging_register(msg_ctx, ev_ctx,
 187                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 188
 189         /*
 190          * Initialize spoolss with an init function to convert printers first.
 191          * static_init_rpc will try to initialize the spoolss server too but you
 192          * can't register it twice.
 193          */
 194         spoolss_cb.init = spoolss_init_cb;
 195         spoolss_cb.shutdown = spoolss_shutdown_cb;
 196         spoolss_cb.private_data = msg_ctx;
 197
 198         status = rpc_winreg_init(NULL);
 199         if (!NT_STATUS_IS_OK(status)) {
 200                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 201                           nt_errstr(status)));
 202                 exit(1);
 203         }
 204
 205         status = rpc_spoolss_init(&spoolss_cb);
 206         if (!NT_STATUS_IS_OK(status)) {
 207                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 208                           nt_errstr(status)));
 209                 exit(1);
 210         }
 211
 212         if (!setup_named_pipe_socket(SPOOLSS_PIPE_NAME, ev_ctx)) {
 213                 exit(1);
 214         }
 215
 216         DEBUG(1, ("SPOOLSS Daemon Started (%d)\n", getpid()));
 217
 218         /* loop forever */
 219         ret = tevent_loop_wait(ev_ctx);
 220
 221         /* should not be reached */
 222         DEBUG(0,("background_queue: tevent_loop_wait() exited with %d - %s\n",
 223                  ret, (ret == 0) ? "out of events" : strerror(errno)));
 224         exit(1);
 225 }