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
notify_init(TALLOC_CTX * mem_ctx,struct messaging_context * msg,struct smbd_server_connection * sconn,void (* callback)(struct smbd_server_connection * sconn,void *,struct timespec,const struct notify_event *))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
notify_context_destructor(struct notify_context * ctx)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
notify_handler(struct messaging_context * msg,void * private_data,uint32_t msg_type,struct server_id src,DATA_BLOB * data)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
notify_add(struct notify_context * ctx,const char * path,uint32_t filter,uint32_t subdir_filter,void * private_data)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
notify_remove(struct notify_context * ctx,void * private_data,char * path)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
notify_trigger(struct notify_context * ctx,uint32_t action,uint32_t filter,const char * dir,const char * name)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
notify_walk(struct notify_context * notify,bool (* fn)(const char * path,struct server_id server,const struct notify_instance * instance,void * private_data),void * private_data)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 }
308