source3/rpc_server/epmd.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *
   4  *  SMBD RPC service callbacks
   5  *
   6  *  Copyright (c) 2011      Andreas Schneider <asn@samba.org>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "includes.h"
  23
  24 #include "serverid.h"
  25 #include "../librpc/gen_ndr/srv_epmapper.h"
  26 #include "rpc_server/rpc_server.h"
  27 #include "rpc_server/epmapper/srv_epmapper.h"
  28 #include "messages.h"
  29
  30 #define DAEMON_NAME "epmd"
  31
  32 void start_epmd(struct tevent_context *ev_ctx,
  33                 struct messaging_context *msg_ctx);
  34
  35 static bool epmd_open_sockets(struct tevent_context *ev_ctx,
  36                               struct messaging_context *msg_ctx)
  37 {
  38         uint32_t num_ifs = iface_count();
  39         uint16_t port;
  40         uint32_t i;
  41
  42         if (lp_interfaces() && lp_bind_interfaces_only()) {
  43                 /*
  44                  * We have been given an interfaces line, and been told to only
  45                  * bind to those interfaces. Create a socket per interface and
  46                  * bind to only these.
  47                  */
  48
  49                 /* Now open a listen socket for each of the interfaces. */
  50                 for(i = 0; i < num_ifs; i++) {
  51                         const struct sockaddr_storage *ifss =
  52                                         iface_n_sockaddr_storage(i);
  53
  54                         port = setup_dcerpc_ncacn_tcpip_socket(ev_ctx,
  55                                                                msg_ctx,
  56                                                                ndr_table_epmapper.syntax_id,
  57                                                                ifss,
  58                                                                135);
  59                         if (port == 0) {
  60                                 return false;
  61                         }
  62                 }
  63         } else {
  64                 const char *sock_addr = lp_socket_address();
  65                 const char *sock_ptr;
  66                 char *sock_tok;
  67
  68                 if (strequal(sock_addr, "0.0.0.0") ||
  69                     strequal(sock_addr, "::")) {
  70 #if HAVE_IPV6
  71                         sock_addr = "::";
  72 #else
  73                         sock_addr = "0.0.0.0";
  74 #endif
  75                 }
  76
  77                 for (sock_ptr = sock_addr;
  78                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,");
  79                     ) {
  80                         struct sockaddr_storage ss;
  81
  82                         /* open an incoming socket */
  83                         if (!interpret_string_addr(&ss,
  84                                                    sock_tok,
  85                                                    AI_NUMERICHOST|AI_PASSIVE)) {
  86                                 continue;
  87                         }
  88
  89                         port = setup_dcerpc_ncacn_tcpip_socket(ev_ctx,
  90                                                                msg_ctx,
  91                                                                ndr_table_epmapper.syntax_id,
  92                                                                &ss,
  93                                                                135);
  94                         if (port == 0) {
  95                                 return false;
  96                         }
  97                 }
  98         }
  99
 100         return true;
 101 }
 102
 103 static void epmd_reopen_logs(void)
 104 {
 105         char *lfile = lp_logfile();
 106         int rc;
 107
 108         if (lfile == NULL || lfile[0] == '\0') {
 109                 rc = asprintf(&lfile, "%s/log.%s", get_dyn_LOGFILEBASE(), DAEMON_NAME);
 110                 if (rc > 0) {
 111                         lp_set_logfile(lfile);
 112                         SAFE_FREE(lfile);
 113                 }
 114         } else {
 115                 if (strstr(lfile, DAEMON_NAME) == NULL) {
 116                         rc = asprintf(&lfile, "%s.%s", lp_logfile(), DAEMON_NAME);
 117                         if (rc > 0) {
 118                                 lp_set_logfile(lfile);
 119                                 SAFE_FREE(lfile);
 120                         }
 121                 }
 122         }
 123
 124         reopen_logs();
 125 }
 126
 127 static void epmd_smb_conf_updated(struct messaging_context *msg,
 128                                   void *private_data,
 129                                   uint32_t msg_type,
 130                                   struct server_id server_id,
 131                                   DATA_BLOB *data)
 132 {
 133         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
 134         change_to_root_user();
 135         epmd_reopen_logs();
 136 }
 137
 138 static void epmd_sig_term_handler(struct tevent_context *ev,
 139                                   struct tevent_signal *se,
 140                                   int signum,
 141                                   int count,
 142                                   void *siginfo,
 143                                   void *private_data)
 144 {
 145         rpc_epmapper_shutdown();
 146
 147         exit_server_cleanly("termination signal");
 148 }
 149
 150 static void epmd_setup_sig_term_handler(struct tevent_context *ev_ctx)
 151 {
 152         struct tevent_signal *se;
 153
 154         se = tevent_add_signal(ev_ctx,
 155                                ev_ctx,
 156                                SIGTERM, 0,
 157                                epmd_sig_term_handler,
 158                                NULL);
 159         if (se == NULL) {
 160                 exit_server("failed to setup SIGTERM handler");
 161         }
 162 }
 163
 164 static void epmd_sig_hup_handler(struct tevent_context *ev,
 165                                     struct tevent_signal *se,
 166                                     int signum,
 167                                     int count,
 168                                     void *siginfo,
 169                                     void *private_data)
 170 {
 171         change_to_root_user();
 172
 173         DEBUG(1,("Reloading printers after SIGHUP\n"));
 174         epmd_reopen_logs();
 175 }
 176
 177 static void epmd_setup_sig_hup_handler(struct tevent_context *ev_ctx,
 178                                        struct messaging_context *msg_ctx)
 179 {
 180         struct tevent_signal *se;
 181
 182         se = tevent_add_signal(ev_ctx,
 183                                ev_ctx,
 184                                SIGHUP, 0,
 185                                epmd_sig_hup_handler,
 186                                msg_ctx);
 187         if (se == NULL) {
 188                 exit_server("failed to setup SIGHUP handler");
 189         }
 190 }
 191
 192 static bool epmapper_shutdown_cb(void *ptr) {
 193         srv_epmapper_cleanup();
 194
 195         return true;
 196 }
 197
 198 void start_epmd(struct tevent_context *ev_ctx,
 199                 struct messaging_context *msg_ctx)
 200 {
 201         struct rpc_srv_callbacks epmapper_cb;
 202         NTSTATUS status;
 203         pid_t pid;
 204         bool ok;
 205         int rc;
 206
 207         epmapper_cb.init = NULL;
 208         epmapper_cb.shutdown = epmapper_shutdown_cb;
 209         epmapper_cb.private_data = NULL;
 210
 211         DEBUG(1, ("Forking Endpoint Mapper Daemon\n"));
 212
 213         pid = sys_fork();
 214
 215         if (pid == -1) {
 216                 DEBUG(0, ("Failed to fork Endpoint Mapper [%s], aborting ...\n",
 217                           strerror(errno)));
 218                 exit(1);
 219         }
 220
 221         if (pid) {
 222                 /* parent */
 223                 return;
 224         }
 225
 226         /* child */
 227         close_low_fds(false);
 228
 229         status = reinit_after_fork(msg_ctx,
 230                                    ev_ctx,
 231                                    procid_self(),
 232                                    true);
 233         if (!NT_STATUS_IS_OK(status)) {
 234                 DEBUG(0,("reinit_after_fork() failed\n"));
 235                 smb_panic("reinit_after_fork() failed");
 236         }
 237
 238         epmd_reopen_logs();
 239
 240         epmd_setup_sig_term_handler(ev_ctx);
 241         epmd_setup_sig_hup_handler(ev_ctx, msg_ctx);
 242
 243         ok = serverid_register(procid_self(),
 244                                FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 245                                |FLAG_MSG_PRINT_GENERAL);
 246         if (!ok) {
 247                 DEBUG(0, ("Failed to register serverid in epmd!\n"));
 248                 exit(1);
 249         }
 250
 251         messaging_register(msg_ctx,
 252                            ev_ctx,
 253                            MSG_SMB_CONF_UPDATED,
 254                            epmd_smb_conf_updated);
 255
 256         status = rpc_epmapper_init(&epmapper_cb);
 257         if (!NT_STATUS_IS_OK(status)) {
 258                 DEBUG(0, ("Failed to register epmd rpc inteface! (%s)\n",
 259                           nt_errstr(status)));
 260                 exit(1);
 261         }
 262
 263         ok = setup_dcerpc_ncalrpc_socket(ev_ctx,
 264                                          msg_ctx,
 265                                          ndr_table_epmapper.syntax_id,
 266                                          "EPMAPPER",
 267                                          srv_epmapper_delete_endpoints);
 268         if (!ok) {
 269                 DEBUG(0, ("Failed to open epmd ncalrpc pipe!\n"));
 270                 exit(1);
 271         }
 272
 273         ok = epmd_open_sockets(ev_ctx, msg_ctx);
 274         if (!ok) {
 275                 DEBUG(0, ("Failed to open epmd tcpip sockets!\n"));
 276                 exit(1);
 277         }
 278
 279         ok = setup_named_pipe_socket("epmapper", ev_ctx);
 280         if (!ok) {
 281                 DEBUG(0, ("Failed to open epmd named pipe!\n"));
 282                 exit(1);
 283         }
 284
 285         DEBUG(1, ("Endpoint Mapper Daemon Started (%d)\n", getpid()));
 286
 287         /* loop forever */
 288         rc = tevent_loop_wait(ev_ctx);
 289
 290         /* should not be reached */
 291         DEBUG(0,("background_queue: tevent_loop_wait() exited with %d - %s\n",
 292                  rc, (rc == 0) ? "out of events" : strerror(errno)));
 293
 294         exit(1);
 295 }
 296
 297 /* vim: set ts=8 sw=8 noet cindent ft=c.doxygen: */