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 #include "smbd/smbd.h"
  22 #include "locking/proto.h"
  23
  24 #include "messages.h"
  25 #include "include/printing.h"
  26 #include "printing/nt_printing_migrate.h"
  27 #include "librpc/gen_ndr/srv_winreg.h"
  28 #include "librpc/gen_ndr/srv_spoolss.h"
  29 #include "rpc_server/rpc_server.h"
  30 #include "rpc_server/rpc_ep_setup.h"
  31
  32 #define SPOOLSS_PIPE_NAME "spoolss"
  33 #define DAEMON_NAME "spoolssd"
  34
  35 void start_spoolssd(struct tevent_context *ev_ctx,
  36                     struct messaging_context *msg_ctx);
  37
  38 static void spoolss_reopen_logs(void)
  39 {
  40         char *lfile = lp_logfile();
  41         int rc;
  42
  43         if (lfile == NULL || lfile[0] == '\0') {
  44                 rc = asprintf(&lfile, "%s/log.%s", get_dyn_LOGFILEBASE(), DAEMON_NAME);
  45                 if (rc > 0) {
  46                         lp_set_logfile(lfile);
  47                         SAFE_FREE(lfile);
  48                 }
  49         } else {
  50                 if (strstr(lfile, DAEMON_NAME) == NULL) {
  51                         rc = asprintf(&lfile, "%s.%s", lp_logfile(), DAEMON_NAME);
  52                         if (rc > 0) {
  53                                 lp_set_logfile(lfile);
  54                                 SAFE_FREE(lfile);
  55                         }
  56                 }
  57         }
  58
  59         reopen_logs();
  60 }
  61
  62 static void smb_conf_updated(struct messaging_context *msg,
  63                              void *private_data,
  64                              uint32_t msg_type,
  65                              struct server_id server_id,
  66                              DATA_BLOB *data)
  67 {
  68         struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
  69                                                              struct tevent_context);
  70
  71         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
  72         change_to_root_user();
  73         reload_printers(ev_ctx, msg);
  74         spoolss_reopen_logs();
  75 }
  76
  77 static void spoolss_sig_term_handler(struct tevent_context *ev,
  78                                      struct tevent_signal *se,
  79                                      int signum,
  80                                      int count,
  81                                      void *siginfo,
  82                                      void *private_data)
  83 {
  84         exit_server_cleanly("termination signal");
  85 }
  86
  87 static void spoolss_setup_sig_term_handler(struct tevent_context *ev_ctx)
  88 {
  89         struct tevent_signal *se;
  90
  91         se = tevent_add_signal(ev_ctx,
  92                                ev_ctx,
  93                                SIGTERM, 0,
  94                                spoolss_sig_term_handler,
  95                                NULL);
  96         if (!se) {
  97                 exit_server("failed to setup SIGTERM handler");
  98         }
  99 }
 100
 101 static void spoolss_sig_hup_handler(struct tevent_context *ev,
 102                                     struct tevent_signal *se,
 103                                     int signum,
 104                                     int count,
 105                                     void *siginfo,
 106                                     void *private_data)
 107 {
 108         struct messaging_context *msg_ctx = talloc_get_type_abort(private_data,
 109                                                                   struct messaging_context);
 110
 111         change_to_root_user();
 112         DEBUG(1,("Reloading printers after SIGHUP\n"));
 113         reload_printers(ev, msg_ctx);
 114         spoolss_reopen_logs();
 115 }
 116
 117 static void spoolss_setup_sig_hup_handler(struct tevent_context *ev_ctx,
 118                                           struct messaging_context *msg_ctx)
 119 {
 120         struct tevent_signal *se;
 121
 122         se = tevent_add_signal(ev_ctx,
 123                                ev_ctx,
 124                                SIGHUP, 0,
 125                                spoolss_sig_hup_handler,
 126                                msg_ctx);
 127         if (!se) {
 128                 exit_server("failed to setup SIGHUP handler");
 129         }
 130 }
 131
 132 static bool spoolss_init_cb(void *ptr)
 133 {
 134         struct messaging_context *msg_ctx = talloc_get_type_abort(
 135                 ptr, struct messaging_context);
 136
 137         return nt_printing_tdb_migrate(msg_ctx);
 138 }
 139
 140 static bool spoolss_shutdown_cb(void *ptr)
 141 {
 142         srv_spoolss_cleanup();
 143
 144         return true;
 145 }
 146
 147 void start_spoolssd(struct tevent_context *ev_ctx,
 148                     struct messaging_context *msg_ctx)
 149 {
 150         struct rpc_srv_callbacks spoolss_cb;
 151         pid_t pid;
 152         NTSTATUS status;
 153         int ret;
 154
 155         DEBUG(1, ("Forking SPOOLSS Daemon\n"));
 156
 157         pid = sys_fork();
 158
 159         if (pid == -1) {
 160                 DEBUG(0, ("Failed to fork SPOOLSS [%s], aborting ...\n",
 161                            strerror(errno)));
 162                 exit(1);
 163         }
 164
 165         if (pid) {
 166                 /* parent */
 167                 return;
 168         }
 169
 170         /* child */
 171         close_low_fds(false);
 172
 173         status = reinit_after_fork(msg_ctx,
 174                                    ev_ctx,
 175                                    procid_self(), true);
 176         if (!NT_STATUS_IS_OK(status)) {
 177                 DEBUG(0,("reinit_after_fork() failed\n"));
 178                 smb_panic("reinit_after_fork() failed");
 179         }
 180
 181         spoolss_reopen_logs();
 182
 183         spoolss_setup_sig_term_handler(ev_ctx);
 184         spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);
 185
 186         if (!serverid_register(procid_self(),
 187                                 FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 188                                 |FLAG_MSG_PRINT_GENERAL)) {
 189                 exit(1);
 190         }
 191
 192         if (!locking_init()) {
 193                 exit(1);
 194         }
 195
 196         messaging_register(msg_ctx, NULL,
 197                            MSG_PRINTER_UPDATE, print_queue_receive);
 198         messaging_register(msg_ctx, ev_ctx,
 199                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 200
 201         /*
 202          * Initialize spoolss with an init function to convert printers first.
 203          * static_init_rpc will try to initialize the spoolss server too but you
 204          * can't register it twice.
 205          */
 206         spoolss_cb.init = spoolss_init_cb;
 207         spoolss_cb.shutdown = spoolss_shutdown_cb;
 208         spoolss_cb.private_data = msg_ctx;
 209
 210         status = rpc_winreg_init(NULL);
 211         if (!NT_STATUS_IS_OK(status)) {
 212                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 213                           nt_errstr(status)));
 214                 exit(1);
 215         }
 216
 217         status = rpc_spoolss_init(&spoolss_cb);
 218         if (!NT_STATUS_IS_OK(status)) {
 219                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 220                           nt_errstr(status)));
 221                 exit(1);
 222         }
 223
 224         if (!setup_named_pipe_socket(SPOOLSS_PIPE_NAME, ev_ctx)) {
 225                 exit(1);
 226         }
 227
 228         status = rpc_ep_setup_register(ev_ctx, msg_ctx, &ndr_table_spoolss, NULL, 0);
 229         if (!NT_STATUS_IS_OK(status)) {
 230                 DEBUG(0, ("Failed to register spoolss endpoint! (%s)\n",
 231                           nt_errstr(status)));
 232                 exit(1);
 233         }
 234
 235         DEBUG(1, ("SPOOLSS Daemon Started (%d)\n", getpid()));
 236
 237         /* loop forever */
 238         ret = tevent_loop_wait(ev_ctx);
 239
 240         /* should not be reached */
 241         DEBUG(0,("background_queue: tevent_loop_wait() exited with %d - %s\n",
 242                  ret, (ret == 0) ? "out of events" : strerror(errno)));
 243         exit(1);
 244 }