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 "ntdomain.h"
  26 #include "../librpc/gen_ndr/srv_epmapper.h"
  27 #include "rpc_server/rpc_server.h"
  28 #include "rpc_server/epmapper/srv_epmapper.h"
  29 #include "messages.h"
  30
  31 #define DAEMON_NAME "epmd"
  32
  33 void start_epmd(struct tevent_context *ev_ctx,
  34                 struct messaging_context *msg_ctx);
  35
  36 static bool epmd_open_sockets(struct tevent_context *ev_ctx,
  37                               struct messaging_context *msg_ctx)
  38 {
  39         uint32_t num_ifs = iface_count();
  40         uint16_t port;
  41         uint32_t i;
  42
  43         if (lp_interfaces() && lp_bind_interfaces_only()) {
  44                 /*
  45                  * We have been given an interfaces line, and been told to only
  46                  * bind to those interfaces. Create a socket per interface and
  47                  * bind to only these.
  48                  */
  49
  50                 /* Now open a listen socket for each of the interfaces. */
  51                 for(i = 0; i < num_ifs; i++) {
  52                         const struct sockaddr_storage *ifss =
  53                                         iface_n_sockaddr_storage(i);
  54
  55                         port = setup_dcerpc_ncacn_tcpip_socket(ev_ctx,
  56                                                                msg_ctx,
  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 = "::,0.0.0.0";
  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                                                                &ss,
  92                                                                135);
  93                         if (port == 0) {
  94                                 return false;
  95                         }
  96                 }
  97         }
  98
  99         return true;
 100 }
 101
 102 static void epmd_reopen_logs(void)
 103 {
 104         char *lfile = lp_logfile();
 105         int rc;
 106
 107         if (lfile == NULL || lfile[0] == '\0') {
 108                 rc = asprintf(&lfile, "%s/log.%s", get_dyn_LOGFILEBASE(), DAEMON_NAME);
 109                 if (rc > 0) {
 110                         lp_set_logfile(lfile);
 111                         SAFE_FREE(lfile);
 112                 }
 113         } else {
 114                 if (strstr(lfile, DAEMON_NAME) == NULL) {
 115                         rc = asprintf(&lfile, "%s.%s", lp_logfile(), DAEMON_NAME);
 116                         if (rc > 0) {
 117                                 lp_set_logfile(lfile);
 118                                 SAFE_FREE(lfile);
 119                         }
 120                 }
 121         }
 122
 123         reopen_logs();
 124 }
 125
 126 static void epmd_smb_conf_updated(struct messaging_context *msg,
 127                                   void *private_data,
 128                                   uint32_t msg_type,
 129                                   struct server_id server_id,
 130                                   DATA_BLOB *data)
 131 {
 132         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
 133         change_to_root_user();
 134         epmd_reopen_logs();
 135 }
 136
 137 static void epmd_sig_term_handler(struct tevent_context *ev,
 138                                   struct tevent_signal *se,
 139                                   int signum,
 140                                   int count,
 141                                   void *siginfo,
 142                                   void *private_data)
 143 {
 144         rpc_epmapper_shutdown();
 145
 146         exit_server_cleanly("termination signal");
 147 }
 148
 149 static void epmd_setup_sig_term_handler(struct tevent_context *ev_ctx)
 150 {
 151         struct tevent_signal *se;
 152
 153         se = tevent_add_signal(ev_ctx,
 154                                ev_ctx,
 155                                SIGTERM, 0,
 156                                epmd_sig_term_handler,
 157                                NULL);
 158         if (se == NULL) {
 159                 exit_server("failed to setup SIGTERM handler");
 160         }
 161 }
 162
 163 static void epmd_sig_hup_handler(struct tevent_context *ev,
 164                                     struct tevent_signal *se,
 165                                     int signum,
 166                                     int count,
 167                                     void *siginfo,
 168                                     void *private_data)
 169 {
 170         change_to_root_user();
 171
 172         DEBUG(1,("Reloading printers after SIGHUP\n"));
 173         epmd_reopen_logs();
 174 }
 175
 176 static void epmd_setup_sig_hup_handler(struct tevent_context *ev_ctx,
 177                                        struct messaging_context *msg_ctx)
 178 {
 179         struct tevent_signal *se;
 180
 181         se = tevent_add_signal(ev_ctx,
 182                                ev_ctx,
 183                                SIGHUP, 0,
 184                                epmd_sig_hup_handler,
 185                                msg_ctx);
 186         if (se == NULL) {
 187                 exit_server("failed to setup SIGHUP handler");
 188         }
 189 }
 190
 191 static bool epmapper_shutdown_cb(void *ptr) {
 192         srv_epmapper_cleanup();
 193
 194         return true;
 195 }
 196
 197 void start_epmd(struct tevent_context *ev_ctx,
 198                 struct messaging_context *msg_ctx)
 199 {
 200         struct rpc_srv_callbacks epmapper_cb;
 201         NTSTATUS status;
 202         pid_t pid;
 203         bool ok;
 204         int rc;
 205
 206         epmapper_cb.init = NULL;
 207         epmapper_cb.shutdown = epmapper_shutdown_cb;
 208         epmapper_cb.private_data = NULL;
 209
 210         DEBUG(1, ("Forking Endpoint Mapper Daemon\n"));
 211
 212         pid = sys_fork();
 213
 214         if (pid == -1) {
 215                 DEBUG(0, ("Failed to fork Endpoint Mapper [%s], aborting ...\n",
 216                           strerror(errno)));
 217                 exit(1);
 218         }
 219
 220         if (pid) {
 221                 /* parent */
 222                 return;
 223         }
 224
 225         /* child */
 226         close_low_fds(false);
 227
 228         status = reinit_after_fork(msg_ctx,
 229                                    ev_ctx,
 230                                    procid_self(),
 231                                    true);
 232         if (!NT_STATUS_IS_OK(status)) {
 233                 DEBUG(0,("reinit_after_fork() failed\n"));
 234                 smb_panic("reinit_after_fork() failed");
 235         }
 236
 237         epmd_reopen_logs();
 238
 239         epmd_setup_sig_term_handler(ev_ctx);
 240         epmd_setup_sig_hup_handler(ev_ctx, msg_ctx);
 241
 242         ok = serverid_register(procid_self(),
 243                                FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 244                                |FLAG_MSG_PRINT_GENERAL);
 245         if (!ok) {
 246                 DEBUG(0, ("Failed to register serverid in epmd!\n"));
 247                 exit(1);
 248         }
 249
 250         messaging_register(msg_ctx,
 251                            ev_ctx,
 252                            MSG_SMB_CONF_UPDATED,
 253                            epmd_smb_conf_updated);
 254
 255         status = rpc_epmapper_init(&epmapper_cb);
 256         if (!NT_STATUS_IS_OK(status)) {
 257                 DEBUG(0, ("Failed to register epmd rpc inteface! (%s)\n",
 258                           nt_errstr(status)));
 259                 exit(1);
 260         }
 261
 262         ok = setup_dcerpc_ncalrpc_socket(ev_ctx,
 263                                          msg_ctx,
 264                                          "EPMAPPER",
 265                                          srv_epmapper_delete_endpoints);
 266         if (!ok) {
 267                 DEBUG(0, ("Failed to open epmd ncalrpc pipe!\n"));
 268                 exit(1);
 269         }
 270
 271         ok = epmd_open_sockets(ev_ctx, msg_ctx);
 272         if (!ok) {
 273                 DEBUG(0, ("Failed to open epmd tcpip sockets!\n"));
 274                 exit(1);
 275         }
 276
 277         ok = setup_named_pipe_socket("epmapper", ev_ctx);
 278         if (!ok) {
 279                 DEBUG(0, ("Failed to open epmd named pipe!\n"));
 280                 exit(1);
 281         }
 282
 283         DEBUG(1, ("Endpoint Mapper Daemon Started (%d)\n", getpid()));
 284
 285         /* loop forever */
 286         rc = tevent_loop_wait(ev_ctx);
 287
 288         /* should not be reached */
 289         DEBUG(0,("background_queue: tevent_loop_wait() exited with %d - %s\n",
 290                  rc, (rc == 0) ? "out of events" : strerror(errno)));
 291
 292         exit(1);
 293 }
 294
 295 /* vim: set ts=8 sw=8 noet cindent ft=c.doxygen: */