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
  23 #include "messages.h"
  24 #include "include/printing.h"
  25 #include "printing/nt_printing_migrate.h"
  26 #include "ntdomain.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 #include "rpc_server/spoolss/srv_spoolss_nt.h"
  32
  33 #define SPOOLSS_PIPE_NAME "spoolss"
  34 #define DAEMON_NAME "spoolssd"
  35
  36 void start_spoolssd(struct tevent_context *ev_ctx,
  37                     struct messaging_context *msg_ctx);
  38
  39 static void spoolss_reopen_logs(void)
  40 {
  41         char *lfile = lp_logfile();
  42         int rc;
  43
  44         if (lfile == NULL || lfile[0] == '\0') {
  45                 rc = asprintf(&lfile, "%s/log.%s", get_dyn_LOGFILEBASE(), DAEMON_NAME);
  46                 if (rc > 0) {
  47                         lp_set_logfile(lfile);
  48                         SAFE_FREE(lfile);
  49                 }
  50         } else {
  51                 if (strstr(lfile, DAEMON_NAME) == NULL) {
  52                         rc = asprintf(&lfile, "%s.%s", lp_logfile(), DAEMON_NAME);
  53                         if (rc > 0) {
  54                                 lp_set_logfile(lfile);
  55                                 SAFE_FREE(lfile);
  56                         }
  57                 }
  58         }
  59
  60         reopen_logs();
  61 }
  62
  63 static void smb_conf_updated(struct messaging_context *msg,
  64                              void *private_data,
  65                              uint32_t msg_type,
  66                              struct server_id server_id,
  67                              DATA_BLOB *data)
  68 {
  69         struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
  70                                                              struct tevent_context);
  71
  72         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
  73         change_to_root_user();
  74         reload_printers(ev_ctx, msg);
  75         spoolss_reopen_logs();
  76 }
  77
  78 static void spoolss_sig_term_handler(struct tevent_context *ev,
  79                                      struct tevent_signal *se,
  80                                      int signum,
  81                                      int count,
  82                                      void *siginfo,
  83                                      void *private_data)
  84 {
  85         exit_server_cleanly("termination signal");
  86 }
  87
  88 static void spoolss_setup_sig_term_handler(struct tevent_context *ev_ctx)
  89 {
  90         struct tevent_signal *se;
  91
  92         se = tevent_add_signal(ev_ctx,
  93                                ev_ctx,
  94                                SIGTERM, 0,
  95                                spoolss_sig_term_handler,
  96                                NULL);
  97         if (!se) {
  98                 exit_server("failed to setup SIGTERM handler");
  99         }
 100 }
 101
 102 static void spoolss_sig_hup_handler(struct tevent_context *ev,
 103                                     struct tevent_signal *se,
 104                                     int signum,
 105                                     int count,
 106                                     void *siginfo,
 107                                     void *private_data)
 108 {
 109         struct messaging_context *msg_ctx = talloc_get_type_abort(private_data,
 110                                                                   struct messaging_context);
 111
 112         change_to_root_user();
 113         DEBUG(1,("Reloading printers after SIGHUP\n"));
 114         reload_printers(ev, msg_ctx);
 115         spoolss_reopen_logs();
 116 }
 117
 118 static void spoolss_setup_sig_hup_handler(struct tevent_context *ev_ctx,
 119                                           struct messaging_context *msg_ctx)
 120 {
 121         struct tevent_signal *se;
 122
 123         se = tevent_add_signal(ev_ctx,
 124                                ev_ctx,
 125                                SIGHUP, 0,
 126                                spoolss_sig_hup_handler,
 127                                msg_ctx);
 128         if (!se) {
 129                 exit_server("failed to setup SIGHUP handler");
 130         }
 131 }
 132
 133 static bool spoolss_init_cb(void *ptr)
 134 {
 135         struct messaging_context *msg_ctx = talloc_get_type_abort(
 136                 ptr, struct messaging_context);
 137
 138         return nt_printing_tdb_migrate(msg_ctx);
 139 }
 140
 141 static bool spoolss_shutdown_cb(void *ptr)
 142 {
 143         srv_spoolss_cleanup();
 144
 145         return true;
 146 }
 147
 148 void start_spoolssd(struct tevent_context *ev_ctx,
 149                     struct messaging_context *msg_ctx)
 150 {
 151         struct rpc_srv_callbacks spoolss_cb;
 152         pid_t pid;
 153         NTSTATUS status;
 154         int ret;
 155
 156         DEBUG(1, ("Forking SPOOLSS Daemon\n"));
 157
 158         pid = sys_fork();
 159
 160         if (pid == -1) {
 161                 DEBUG(0, ("Failed to fork SPOOLSS [%s], aborting ...\n",
 162                            strerror(errno)));
 163                 exit(1);
 164         }
 165
 166         if (pid) {
 167                 /* parent */
 168                 return;
 169         }
 170
 171         /* child */
 172         close_low_fds(false);
 173
 174         status = reinit_after_fork(msg_ctx,
 175                                    ev_ctx,
 176                                    procid_self(), true);
 177         if (!NT_STATUS_IS_OK(status)) {
 178                 DEBUG(0,("reinit_after_fork() failed\n"));
 179                 smb_panic("reinit_after_fork() failed");
 180         }
 181
 182         spoolss_reopen_logs();
 183
 184         spoolss_setup_sig_term_handler(ev_ctx);
 185         spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);
 186
 187         if (!serverid_register(procid_self(),
 188                                 FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 189                                 |FLAG_MSG_PRINT_GENERAL)) {
 190                 exit(1);
 191         }
 192
 193         if (!locking_init()) {
 194                 exit(1);
 195         }
 196
 197         messaging_register(msg_ctx, NULL,
 198                            MSG_PRINTER_UPDATE, print_queue_receive);
 199         messaging_register(msg_ctx, ev_ctx,
 200                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 201
 202         /*
 203          * Initialize spoolss with an init function to convert printers first.
 204          * static_init_rpc will try to initialize the spoolss server too but you
 205          * can't register it twice.
 206          */
 207         spoolss_cb.init = spoolss_init_cb;
 208         spoolss_cb.shutdown = spoolss_shutdown_cb;
 209         spoolss_cb.private_data = msg_ctx;
 210
 211         status = rpc_winreg_init(NULL);
 212         if (!NT_STATUS_IS_OK(status)) {
 213                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 214                           nt_errstr(status)));
 215                 exit(1);
 216         }
 217
 218         status = rpc_spoolss_init(&spoolss_cb);
 219         if (!NT_STATUS_IS_OK(status)) {
 220                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 221                           nt_errstr(status)));
 222                 exit(1);
 223         }
 224
 225         if (!setup_named_pipe_socket(SPOOLSS_PIPE_NAME, ev_ctx)) {
 226                 exit(1);
 227         }
 228
 229         status = rpc_ep_setup_register(ev_ctx, msg_ctx, &ndr_table_spoolss, NULL, 0);
 230         if (!NT_STATUS_IS_OK(status)) {
 231                 DEBUG(0, ("Failed to register spoolss endpoint! (%s)\n",
 232                           nt_errstr(status)));
 233                 exit(1);
 234         }
 235
 236         DEBUG(1, ("SPOOLSS Daemon Started (%d)\n", getpid()));
 237
 238         /* loop forever */
 239         ret = tevent_loop_wait(ev_ctx);
 240
 241         /* should not be reached */
 242         DEBUG(0,("background_queue: tevent_loop_wait() exited with %d - %s\n",
 243                  ret, (ret == 0) ? "out of events" : strerror(errno)));
 244         exit(1);
 245 }