source3/smbd/notify_msg.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  *
   4  * Copyright (C) Volker Lendecke 2014
   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
  20 #include "includes.h"
  21 #include "librpc/gen_ndr/notify.h"
  22 #include "librpc/gen_ndr/messaging.h"
  23 #include "lib/dbwrap/dbwrap.h"
  24 #include "lib/dbwrap/dbwrap_rbt.h"
  25 #include "lib/util/server_id.h"
  26 #include "messages.h"
  27 #include "proto.h"
  28 #include "globals.h"
  29 #include "tdb.h"
  30 #include "util_tdb.h"
  31 #include "lib/util/server_id_db.h"
  32 #include "smbd/notifyd/notifyd.h"
  33
  34 struct notify_context {
  35         struct server_id notifyd;
  36         struct messaging_context *msg_ctx;
  37
  38         struct smbd_server_connection *sconn;
  39         void (*callback)(struct smbd_server_connection *sconn,
  40                          void *private_data, struct timespec when,
  41                          const struct notify_event *ctx);
  42 };
  43
  44 static void notify_handler(struct messaging_context *msg, void *private_data,
  45                            uint32_t msg_type, struct server_id src,
  46                            DATA_BLOB *data);
  47 static int notify_context_destructor(struct notify_context *ctx);
  48
  49 struct notify_context *notify_init(
  50         TALLOC_CTX *mem_ctx, struct messaging_context *msg,
  51         struct smbd_server_connection *sconn,
  52         void (*callback)(struct smbd_server_connection *sconn,
  53                          void *, struct timespec,
  54                          const struct notify_event *))
  55 {
  56         struct server_id_db *names_db;
  57         struct notify_context *ctx;
  58         NTSTATUS status;
  59
  60         ctx = talloc(mem_ctx, struct notify_context);
  61         if (ctx == NULL) {
  62                 return NULL;
  63         }
  64         ctx->msg_ctx = msg;
  65
  66         ctx->sconn = sconn;
  67         ctx->callback = callback;
  68
  69         names_db = messaging_names_db(msg);
  70         if (!server_id_db_lookup_one(names_db, "notify-daemon",
  71                                      &ctx->notifyd)) {
  72                 DEBUG(1, ("No notify daemon around\n"));
  73                 TALLOC_FREE(ctx);
  74                 return NULL;
  75         }
  76
  77         {
  78                 struct server_id_buf tmp;
  79                 DBG_DEBUG("notifyd=%s\n",
  80                           server_id_str_buf(ctx->notifyd, &tmp));
  81         }
  82
  83         if (callback != NULL) {
  84                 status = messaging_register(msg, ctx, MSG_PVFS_NOTIFY,
  85                                             notify_handler);
  86                 if (!NT_STATUS_IS_OK(status)) {
  87                         DEBUG(1, ("messaging_register failed: %s\n",
  88                                   nt_errstr(status)));
  89                         TALLOC_FREE(ctx);
  90                         return NULL;
  91                 }
  92         }
  93
  94         talloc_set_destructor(ctx, notify_context_destructor);
  95
  96         return ctx;
  97 }
  98
  99 static int notify_context_destructor(struct notify_context *ctx)
 100 {
 101         if (ctx->callback != NULL) {
 102                 messaging_deregister(ctx->msg_ctx, MSG_PVFS_NOTIFY, ctx);
 103         }
 104
 105         return 0;
 106 }
 107
 108 static void notify_handler(struct messaging_context *msg, void *private_data,
 109                            uint32_t msg_type, struct server_id src,
 110                            DATA_BLOB *data)
 111 {
 112         struct notify_context *ctx = talloc_get_type_abort(
 113                 private_data, struct notify_context);
 114         struct notify_event_msg *event_msg;
 115         struct notify_event event;
 116
 117         if (data->length < offsetof(struct notify_event_msg, path) + 1) {
 118                 DEBUG(1, ("message too short: %u\n", (unsigned)data->length));
 119                 return;
 120         }
 121         if (data->data[data->length-1] != 0) {
 122                 DEBUG(1, ("%s: path not 0-terminated\n", __func__));
 123                 return;
 124         }
 125
 126         event_msg = (struct notify_event_msg *)data->data;
 127
 128         event.action = event_msg->action;
 129         event.path = event_msg->path;
 130         event.private_data = event_msg->private_data;
 131
 132         DEBUG(10, ("%s: Got notify_event action=%u, private_data=%p, "
 133                    "path=%s\n", __func__, (unsigned)event.action,
 134                    event.private_data, event.path));
 135
 136         ctx->callback(ctx->sconn, event.private_data, event_msg->when, &event);
 137 }
 138
 139 NTSTATUS notify_add(struct notify_context *ctx,
 140                     const char *path, uint32_t filter, uint32_t subdir_filter,
 141                     void *private_data)
 142 {
 143         struct notify_rec_change_msg msg = {};
 144         struct iovec iov[2];
 145         size_t pathlen;
 146         NTSTATUS status;
 147
 148         if (ctx == NULL) {
 149                 return NT_STATUS_NOT_IMPLEMENTED;
 150         }
 151
 152         DEBUG(10, ("%s: path=[%s], filter=%u, subdir_filter=%u, "
 153                    "private_data=%p\n", __func__, path, (unsigned)filter,
 154                    (unsigned)subdir_filter, private_data));
 155
 156         pathlen = strlen(path)+1;
 157
 158         clock_gettime_mono(&msg.instance.creation_time);
 159         msg.instance.filter = filter;
 160         msg.instance.subdir_filter = subdir_filter;
 161         msg.instance.private_data = private_data;
 162
 163         iov[0].iov_base = &msg;
 164         iov[0].iov_len = offsetof(struct notify_rec_change_msg, path);
 165         iov[1].iov_base = discard_const_p(char, path);
 166         iov[1].iov_len = pathlen;
 167
 168         status =  messaging_send_iov(
 169                 ctx->msg_ctx, ctx->notifyd, MSG_SMB_NOTIFY_REC_CHANGE,
 170                 iov, ARRAY_SIZE(iov), NULL, 0);
 171
 172         if (!NT_STATUS_IS_OK(status)) {
 173                 DEBUG(10, ("messaging_send_iov returned %s\n",
 174                            nt_errstr(status)));
 175                 return status;
 176         }
 177
 178         return NT_STATUS_OK;
 179 }
 180
 181 NTSTATUS notify_remove(struct notify_context *ctx, void *private_data,
 182                        char *path)
 183 {
 184         struct notify_rec_change_msg msg = {};
 185         struct iovec iov[2];
 186         NTSTATUS status;
 187
 188         /* see if change notify is enabled at all */
 189         if (ctx == NULL) {
 190                 return NT_STATUS_NOT_IMPLEMENTED;
 191         }
 192
 193         msg.instance.private_data = private_data;
 194
 195         iov[0].iov_base = &msg;
 196         iov[0].iov_len = offsetof(struct notify_rec_change_msg, path);
 197         iov[1].iov_base = path;
 198         iov[1].iov_len = strlen(path)+1;
 199
 200         status = messaging_send_iov(
 201                 ctx->msg_ctx, ctx->notifyd, MSG_SMB_NOTIFY_REC_CHANGE,
 202                 iov, ARRAY_SIZE(iov), NULL, 0);
 203
 204         return status;
 205 }
 206
 207 void notify_trigger(struct notify_context *ctx,
 208                     uint32_t action, uint32_t filter,
 209                     const char *dir, const char *name)
 210 {
 211         struct notify_trigger_msg msg;
 212         struct iovec iov[4];
 213         char slash = '/';
 214
 215         DEBUG(10, ("notify_trigger called action=0x%x, filter=0x%x, "
 216                    "dir=%s, name=%s\n", (unsigned)action, (unsigned)filter,
 217                    dir, name));
 218
 219         if (ctx == NULL) {
 220                 return;
 221         }
 222
 223         msg.when = timespec_current();
 224         msg.action = action;
 225         msg.filter = filter;
 226
 227         iov[0].iov_base = &msg;
 228         iov[0].iov_len = offsetof(struct notify_trigger_msg, path);
 229         iov[1].iov_base = discard_const_p(char, dir);
 230         iov[1].iov_len = strlen(dir);
 231         iov[2].iov_base = &slash;
 232         iov[2].iov_len = 1;
 233         iov[3].iov_base = discard_const_p(char, name);
 234         iov[3].iov_len = strlen(name)+1;
 235
 236         messaging_send_iov(
 237                 ctx->msg_ctx, ctx->notifyd, MSG_SMB_NOTIFY_TRIGGER,
 238                 iov, ARRAY_SIZE(iov), NULL, 0);
 239 }
 240
 241 NTSTATUS notify_walk(struct notify_context *notify,
 242                      bool (*fn)(const char *path, struct server_id server,
 243                                 const struct notify_instance *instance,
 244                                 void *private_data),
 245                      void *private_data)
 246 {
 247         struct tevent_context *ev;
 248         struct tevent_req *req;
 249         struct messaging_rec *rec;
 250         uint64_t log_idx;
 251         NTSTATUS status;
 252         int ret;
 253         bool ok;
 254
 255         ev = samba_tevent_context_init(notify);
 256         if (ev == NULL) {
 257                 return NT_STATUS_NO_MEMORY;
 258         }
 259
 260         req = messaging_read_send(ev, ev, notify->msg_ctx, MSG_SMB_NOTIFY_DB);
 261         if (req == NULL) {
 262                 TALLOC_FREE(ev);
 263                 return NT_STATUS_NO_MEMORY;
 264         }
 265
 266         ok = tevent_req_set_endtime(req, ev, timeval_current_ofs(10, 0));
 267         if (!ok) {
 268                 TALLOC_FREE(ev);
 269                 return NT_STATUS_NO_MEMORY;
 270         }
 271
 272         status = messaging_send_buf(notify->msg_ctx, notify->notifyd,
 273                                     MSG_SMB_NOTIFY_GET_DB, NULL, 0);
 274         if (!NT_STATUS_IS_OK(status)) {
 275                 DEBUG(10, ("%s: messaging_send_buf failed\n",
 276                            nt_errstr(status)));
 277                 TALLOC_FREE(ev);
 278                 return status;
 279         }
 280
 281         ok = tevent_req_poll(req, ev);
 282         if (!ok) {
 283                 DEBUG(10, ("%s: tevent_req_poll failed\n", __func__));
 284                 TALLOC_FREE(ev);
 285                 return NT_STATUS_INTERNAL_ERROR;
 286         }
 287
 288         ret = messaging_read_recv(req, ev, &rec);
 289         if (ret != 0) {
 290                 DEBUG(10, ("%s: messaging_read_recv failed: %s\n",
 291                            __func__, strerror(ret)));
 292                 TALLOC_FREE(ev);
 293                 return map_nt_error_from_unix(ret);
 294         }
 295
 296         ret = notifyd_parse_db(rec->buf.data, rec->buf.length, &log_idx,
 297                                fn, private_data);
 298         if (ret != 0) {
 299                 DEBUG(10, ("%s: notifyd_parse_db failed: %s\n",
 300                            __func__, strerror(ret)));
 301                 TALLOC_FREE(ev);
 302                 return map_nt_error_from_unix(ret);
 303         }
 304
 305         TALLOC_FREE(ev);
 306         return NT_STATUS_OK;
 307 }