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 (lfile == NULL || lfile[0] == '\0') {
  41                 rc = asprintf(&lfile, "%s/log.%s", get_dyn_LOGFILEBASE(), DAEMON_NAME);
  42                 if (rc > 0) {
  43                         lp_set_logfile(lfile);
  44                         SAFE_FREE(lfile);
  45                 }
  46         } else {
  47                 if (strstr(lfile, DAEMON_NAME) == NULL) {
  48                         rc = asprintf(&lfile, "%s.%s", lp_logfile(), DAEMON_NAME);
  49                         if (rc > 0) {
  50                                 lp_set_logfile(lfile);
  51                                 SAFE_FREE(lfile);
  52                         }
  53                 }
  54         }
  55
  56         reopen_logs();
  57 }
  58
  59 static void smb_conf_updated(struct messaging_context *msg,
  60                              void *private_data,
  61                              uint32_t msg_type,
  62                              struct server_id server_id,
  63                              DATA_BLOB *data)
  64 {
  65         struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
  66                                                              struct tevent_context);
  67
  68         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
  69         change_to_root_user();
  70         reload_printers(ev_ctx, msg);
  71         spoolss_reopen_logs();
  72 }
  73
  74 static void spoolss_sig_term_handler(struct tevent_context *ev,
  75                                      struct tevent_signal *se,
  76                                      int signum,
  77                                      int count,
  78                                      void *siginfo,
  79                                      void *private_data)
  80 {
  81         exit_server_cleanly("termination signal");
  82 }
  83
  84 static void spoolss_setup_sig_term_handler(struct tevent_context *ev_ctx)
  85 {
  86         struct tevent_signal *se;
  87
  88         se = tevent_add_signal(ev_ctx,
  89                                ev_ctx,
  90                                SIGTERM, 0,
  91                                spoolss_sig_term_handler,
  92                                NULL);
  93         if (!se) {
  94                 exit_server("failed to setup SIGTERM handler");
  95         }
  96 }
  97
  98 static void spoolss_sig_hup_handler(struct tevent_context *ev,
  99                                     struct tevent_signal *se,
 100                                     int signum,
 101                                     int count,
 102                                     void *siginfo,
 103                                     void *private_data)
 104 {
 105         struct messaging_context *msg_ctx = talloc_get_type_abort(private_data,
 106                                                                   struct messaging_context);
 107
 108         change_to_root_user();
 109         DEBUG(1,("Reloading printers after SIGHUP\n"));
 110         reload_printers(ev, msg_ctx);
 111         spoolss_reopen_logs();
 112 }
 113
 114 static void spoolss_setup_sig_hup_handler(struct tevent_context *ev_ctx,
 115                                           struct messaging_context *msg_ctx)
 116 {
 117         struct tevent_signal *se;
 118
 119         se = tevent_add_signal(ev_ctx,
 120                                ev_ctx,
 121                                SIGHUP, 0,
 122                                spoolss_sig_hup_handler,
 123                                msg_ctx);
 124         if (!se) {
 125                 exit_server("failed to setup SIGHUP handler");
 126         }
 127 }
 128
 129 static bool spoolss_init_cb(void *ptr)
 130 {
 131         struct messaging_context *msg_ctx = talloc_get_type_abort(
 132                 ptr, struct messaging_context);
 133
 134         return nt_printing_tdb_migrate(msg_ctx);
 135 }
 136
 137 static bool spoolss_shutdown_cb(void *ptr)
 138 {
 139         srv_spoolss_cleanup();
 140
 141         return true;
 142 }
 143
 144 void start_spoolssd(struct tevent_context *ev_ctx,
 145                     struct messaging_context *msg_ctx)
 146 {
 147         struct rpc_srv_callbacks spoolss_cb;
 148         pid_t pid;
 149         NTSTATUS status;
 150         int ret;
 151
 152         DEBUG(1, ("Forking SPOOLSS Daemon\n"));
 153
 154         pid = sys_fork();
 155
 156         if (pid == -1) {
 157                 DEBUG(0, ("Failed to fork SPOOLSS [%s], aborting ...\n",
 158                            strerror(errno)));
 159                 exit(1);
 160         }
 161
 162         if (pid) {
 163                 /* parent */
 164                 return;
 165         }
 166
 167         /* child */
 168         close_low_fds(false);
 169
 170         status = reinit_after_fork(msg_ctx,
 171                                    ev_ctx,
 172                                    procid_self(), true);
 173         if (!NT_STATUS_IS_OK(status)) {
 174                 DEBUG(0,("reinit_after_fork() failed\n"));
 175                 smb_panic("reinit_after_fork() failed");
 176         }
 177
 178         spoolss_reopen_logs();
 179
 180         spoolss_setup_sig_term_handler(ev_ctx);
 181         spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);
 182
 183         if (!serverid_register(procid_self(),
 184                                 FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 185                                 |FLAG_MSG_PRINT_GENERAL)) {
 186                 exit(1);
 187         }
 188
 189         if (!locking_init()) {
 190                 exit(1);
 191         }
 192
 193         messaging_register(msg_ctx, NULL,
 194                            MSG_PRINTER_UPDATE, print_queue_receive);
 195         messaging_register(msg_ctx, ev_ctx,
 196                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 197
 198         /*
 199          * Initialize spoolss with an init function to convert printers first.
 200          * static_init_rpc will try to initialize the spoolss server too but you
 201          * can't register it twice.
 202          */
 203         spoolss_cb.init = spoolss_init_cb;
 204         spoolss_cb.shutdown = spoolss_shutdown_cb;
 205         spoolss_cb.private_data = msg_ctx;
 206
 207         status = rpc_winreg_init(NULL);
 208         if (!NT_STATUS_IS_OK(status)) {
 209                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 210                           nt_errstr(status)));
 211                 exit(1);
 212         }
 213
 214         status = rpc_spoolss_init(&spoolss_cb);
 215         if (!NT_STATUS_IS_OK(status)) {
 216                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 217                           nt_errstr(status)));
 218                 exit(1);
 219         }
 220
 221         if (!setup_named_pipe_socket(SPOOLSS_PIPE_NAME, ev_ctx)) {
 222                 exit(1);
 223         }
 224
 225         DEBUG(1, ("SPOOLSS Daemon Started (%d)\n", getpid()));
 226
 227         /* loop forever */
 228         ret = tevent_loop_wait(ev_ctx);
 229
 230         /* should not be reached */
 231         DEBUG(0,("background_queue: tevent_loop_wait() exited with %d - %s\n",
 232                  ret, (ret == 0) ? "out of events" : strerror(errno)));
 233         exit(1);
 234 }