source3/rpc_server/fssd.c

   1 /*
   2  *  File Server Shadow-Copy Daemon
   3  *
   4  *  Copyright (C) David Disseldorp      2012-2015
   5  *
   6  *  Based on epmd.c:
   7  *  Copyright (c) 2011      Andreas Schneider <asn@samba.org>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 3 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include "includes.h"
  24
  25 #include "ntdomain.h"
  26 #include "messages.h"
  27
  28 #include "librpc/rpc/dcerpc_ep.h"
  29 #include "../librpc/gen_ndr/srv_fsrvp.h"
  30 #include "rpc_server/rpc_server.h"
  31 #include "rpc_server/rpc_sock_helper.h"
  32 #include "rpc_server/fss/srv_fss_agent.h"
  33
  34 #define DAEMON_NAME "fssd"
  35
  36 void start_fssd(struct tevent_context *ev_ctx,
  37                 struct messaging_context *msg_ctx);
  38
  39 static void fssd_reopen_logs(void)
  40 {
  41         char *lfile = lp_logfile(NULL);
  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(NULL), 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 fssd_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         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
  70         change_to_root_user();
  71         fssd_reopen_logs();
  72 }
  73
  74 static void fssd_sig_term_handler(struct tevent_context *ev,
  75                                   struct tevent_signal *se,
  76                                   int signum,
  77                                   int count,
  78                                   void *siginfo,
  79                                   void *private_data)
  80 {
  81         rpc_FileServerVssAgent_shutdown();
  82
  83         exit_server_cleanly("termination signal");
  84 }
  85
  86 static void fssd_setup_sig_term_handler(struct tevent_context *ev_ctx)
  87 {
  88         struct tevent_signal *se;
  89
  90         se = tevent_add_signal(ev_ctx,
  91                                ev_ctx,
  92                                SIGTERM, 0,
  93                                fssd_sig_term_handler,
  94                                NULL);
  95         if (se == NULL) {
  96                 exit_server("failed to setup SIGTERM handler");
  97         }
  98 }
  99
 100 static void fssd_sig_hup_handler(struct tevent_context *ev,
 101                                     struct tevent_signal *se,
 102                                     int signum,
 103                                     int count,
 104                                     void *siginfo,
 105                                     void *private_data)
 106 {
 107         change_to_root_user();
 108
 109         DEBUG(1,("reopening logs after SIGHUP\n"));
 110         fssd_reopen_logs();
 111 }
 112
 113 static void fssd_setup_sig_hup_handler(struct tevent_context *ev_ctx,
 114                                        struct messaging_context *msg_ctx)
 115 {
 116         struct tevent_signal *se;
 117
 118         se = tevent_add_signal(ev_ctx,
 119                                ev_ctx,
 120                                SIGHUP, 0,
 121                                fssd_sig_hup_handler,
 122                                msg_ctx);
 123         if (se == NULL) {
 124                 exit_server("failed to setup SIGHUP handler");
 125         }
 126 }
 127
 128 static bool fss_shutdown_cb(void *ptr)
 129 {
 130         srv_fssa_cleanup();
 131         return true;
 132 }
 133
 134 static bool fss_init_cb(void *ptr)
 135 {
 136         NTSTATUS status;
 137         struct messaging_context *msg_ctx;
 138
 139         msg_ctx = talloc_get_type_abort(ptr, struct messaging_context);
 140         status = srv_fssa_start(msg_ctx);
 141         return NT_STATUS_IS_OK(status);
 142 }
 143
 144 void start_fssd(struct tevent_context *ev_ctx,
 145                 struct messaging_context *msg_ctx)
 146 {
 147         struct rpc_srv_callbacks fss_cb;
 148         NTSTATUS status;
 149         pid_t pid;
 150         bool ok;
 151         int rc;
 152
 153         fss_cb.init = fss_init_cb;
 154         fss_cb.shutdown = fss_shutdown_cb;
 155         fss_cb.private_data = msg_ctx;
 156
 157         DEBUG(1, ("Forking File Server Shadow-copy Daemon\n"));
 158
 159         pid = fork();
 160
 161         if (pid == -1) {
 162                 DEBUG(0, ("failed to fork file server shadow-copy daemon [%s], "
 163                           "aborting ...\n", strerror(errno)));
 164                 exit(1);
 165         }
 166
 167         if (pid) {
 168                 /* parent */
 169                 return;
 170         }
 171
 172         /* child */
 173         status = smbd_reinit_after_fork(msg_ctx, ev_ctx, true, NULL);
 174         if (!NT_STATUS_IS_OK(status)) {
 175                 DEBUG(0,("reinit_after_fork() failed\n"));
 176                 smb_panic("reinit_after_fork() failed");
 177         }
 178
 179         fssd_reopen_logs();
 180
 181         fssd_setup_sig_term_handler(ev_ctx);
 182         fssd_setup_sig_hup_handler(ev_ctx, msg_ctx);
 183
 184         messaging_register(msg_ctx,
 185                            ev_ctx,
 186                            MSG_SMB_CONF_UPDATED,
 187                            fssd_smb_conf_updated);
 188
 189         status = rpc_FileServerVssAgent_init(&fss_cb);
 190         if (!NT_STATUS_IS_OK(status)) {
 191                 DEBUG(0, ("Failed to register fssd rpc interface! (%s)\n",
 192                           nt_errstr(status)));
 193                 exit(1);
 194         }
 195
 196         /* case is normalized by smbd on connection */
 197         ok = setup_named_pipe_socket("fssagentrpc", ev_ctx, msg_ctx);
 198         if (!ok) {
 199                 DEBUG(0, ("Failed to open fssd named pipe!\n"));
 200                 exit(1);
 201         }
 202
 203         DEBUG(1, ("File Server Shadow-copy Daemon Started (%d)\n",
 204                   (int)getpid()));
 205
 206         /* loop forever */
 207         rc = tevent_loop_wait(ev_ctx);
 208
 209         /* should not be reached */
 210         DEBUG(0,("tevent_loop_wait() exited with %d - %s\n",
 211                  rc, (rc == 0) ? "out of events" : strerror(errno)));
 212
 213         exit(1);
 214 }