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 "messages.h"
  27
  28 #include "librpc/rpc/dcerpc_ep.h"
  29 #include "../librpc/gen_ndr/srv_epmapper.h"
  30 #include "rpc_server/rpc_server.h"
  31 #include "rpc_server/rpc_sock_helper.h"
  32 #include "rpc_server/epmapper/srv_epmapper.h"
  33
  34 #define DAEMON_NAME "epmd"
  35
  36 void start_epmd(struct tevent_context *ev_ctx,
  37                 struct messaging_context *msg_ctx);
  38
  39 static void epmd_reopen_logs(void)
  40 {
  41         char *lfile = lp_logfile(talloc_tos());
  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",
  53                                       lp_logfile(talloc_tos()), DAEMON_NAME);
  54                         if (rc > 0) {
  55                                 lp_set_logfile(lfile);
  56                                 SAFE_FREE(lfile);
  57                         }
  58                 }
  59         }
  60
  61         reopen_logs();
  62 }
  63
  64 static void epmd_smb_conf_updated(struct messaging_context *msg,
  65                                   void *private_data,
  66                                   uint32_t msg_type,
  67                                   struct server_id server_id,
  68                                   DATA_BLOB *data)
  69 {
  70         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
  71         change_to_root_user();
  72         epmd_reopen_logs();
  73 }
  74
  75 static void epmd_sig_term_handler(struct tevent_context *ev,
  76                                   struct tevent_signal *se,
  77                                   int signum,
  78                                   int count,
  79                                   void *siginfo,
  80                                   void *private_data)
  81 {
  82         rpc_epmapper_shutdown();
  83
  84         exit_server_cleanly("termination signal");
  85 }
  86
  87 static void epmd_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                                epmd_sig_term_handler,
  95                                NULL);
  96         if (se == NULL) {
  97                 exit_server("failed to setup SIGTERM handler");
  98         }
  99 }
 100
 101 static void epmd_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         change_to_root_user();
 109
 110         DEBUG(1,("Reloading printers after SIGHUP\n"));
 111         epmd_reopen_logs();
 112 }
 113
 114 static void epmd_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                                epmd_sig_hup_handler,
 123                                msg_ctx);
 124         if (se == NULL) {
 125                 exit_server("failed to setup SIGHUP handler");
 126         }
 127 }
 128
 129 static bool epmapper_shutdown_cb(void *ptr) {
 130         srv_epmapper_cleanup();
 131
 132         return true;
 133 }
 134
 135 void start_epmd(struct tevent_context *ev_ctx,
 136                 struct messaging_context *msg_ctx)
 137 {
 138         struct rpc_srv_callbacks epmapper_cb;
 139         NTSTATUS status;
 140         pid_t pid;
 141         bool ok;
 142         int rc;
 143
 144         epmapper_cb.init = NULL;
 145         epmapper_cb.shutdown = epmapper_shutdown_cb;
 146         epmapper_cb.private_data = NULL;
 147
 148         DEBUG(1, ("Forking Endpoint Mapper Daemon\n"));
 149
 150         pid = fork();
 151
 152         if (pid == -1) {
 153                 DEBUG(0, ("Failed to fork Endpoint Mapper [%s], aborting ...\n",
 154                           strerror(errno)));
 155                 exit(1);
 156         }
 157
 158         if (pid) {
 159                 /* parent */
 160                 return;
 161         }
 162
 163         status = reinit_after_fork(msg_ctx,
 164                                    ev_ctx,
 165                                    true);
 166         if (!NT_STATUS_IS_OK(status)) {
 167                 DEBUG(0,("reinit_after_fork() failed\n"));
 168                 smb_panic("reinit_after_fork() failed");
 169         }
 170
 171         epmd_reopen_logs();
 172
 173         epmd_setup_sig_term_handler(ev_ctx);
 174         epmd_setup_sig_hup_handler(ev_ctx, msg_ctx);
 175
 176         ok = serverid_register(procid_self(),
 177                                FLAG_MSG_GENERAL |
 178                                FLAG_MSG_PRINT_GENERAL);
 179         if (!ok) {
 180                 DEBUG(0, ("Failed to register serverid in epmd!\n"));
 181                 exit(1);
 182         }
 183
 184         messaging_register(msg_ctx,
 185                            ev_ctx,
 186                            MSG_SMB_CONF_UPDATED,
 187                            epmd_smb_conf_updated);
 188
 189         status = rpc_epmapper_init(&epmapper_cb);
 190         if (!NT_STATUS_IS_OK(status)) {
 191                 DEBUG(0, ("Failed to register epmd rpc inteface! (%s)\n",
 192                           nt_errstr(status)));
 193                 exit(1);
 194         }
 195
 196         status = rpc_setup_tcpip_sockets(ev_ctx,
 197                                          msg_ctx,
 198                                          &ndr_table_epmapper,
 199                                          NULL,
 200                                          135);
 201         if (!NT_STATUS_IS_OK(status)) {
 202                 DEBUG(0, ("Failed to open epmd tcpip sockets!\n"));
 203                 exit(1);
 204         }
 205
 206         ok = setup_dcerpc_ncalrpc_socket(ev_ctx,
 207                                          msg_ctx,
 208                                          "EPMAPPER",
 209                                          srv_epmapper_delete_endpoints);
 210         if (!ok) {
 211                 DEBUG(0, ("Failed to open epmd ncalrpc pipe!\n"));
 212                 exit(1);
 213         }
 214
 215         ok = setup_named_pipe_socket("epmapper", ev_ctx, msg_ctx);
 216         if (!ok) {
 217                 DEBUG(0, ("Failed to open epmd named pipe!\n"));
 218                 exit(1);
 219         }
 220
 221         DEBUG(1, ("Endpoint Mapper Daemon Started (%d)\n", getpid()));
 222
 223         /* loop forever */
 224         rc = tevent_loop_wait(ev_ctx);
 225
 226         /* should not be reached */
 227         DEBUG(0,("background_queue: tevent_loop_wait() exited with %d - %s\n",
 228                  rc, (rc == 0) ? "out of events" : strerror(errno)));
 229
 230         exit(1);
 231 }
 232
 233 /* vim: set ts=8 sw=8 noet cindent ft=c.doxygen: */