2 Unix SMB/CIFS implementation.
5 Copyright (C) Gregor Beck 2013
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "smbd/globals.h"
26 #include "smbd/scavenger.h"
27 #include "locking/proto.h"
28 #include "lib/util/util_process.h"
31 #define DBGC_CLASS DBGC_SCAVENGER
33 struct smbd_scavenger_state {
34 struct tevent_context *ev;
35 struct messaging_context *msg;
36 struct server_id parent_id;
37 struct server_id *scavenger_id;
41 static struct smbd_scavenger_state *smbd_scavenger_state = NULL;
43 struct scavenger_message {
44 struct file_id file_id;
45 uint64_t open_persistent_id;
49 static int smbd_scavenger_main(struct smbd_scavenger_state *state)
51 DEBUG(10, ("scavenger: %s started, parent: %s\n",
52 server_id_str(talloc_tos(), state->scavenger_id),
53 server_id_str(talloc_tos(), &state->parent_id)));
56 TALLOC_CTX *frame = talloc_stackframe();
59 ret = tevent_loop_once(state->ev);
61 DEBUG(2, ("tevent_loop_once failed: %s\n",
67 DEBUG(10, ("scavenger: %s event loop iteration\n",
68 server_id_str(talloc_tos(), state->scavenger_id)));
75 static void smbd_scavenger_done(struct tevent_context *event_ctx, struct tevent_fd *fde,
76 uint16_t flags, void *private_data)
78 struct smbd_scavenger_state *state = talloc_get_type_abort(
79 private_data, struct smbd_scavenger_state);
81 DEBUG(2, ("scavenger: %s died\n",
82 server_id_str(talloc_tos(), state->scavenger_id)));
84 TALLOC_FREE(state->scavenger_id);
87 static void smbd_scavenger_parent_dead(struct tevent_context *event_ctx,
88 struct tevent_fd *fde,
89 uint16_t flags, void *private_data)
91 struct smbd_scavenger_state *state = talloc_get_type_abort(
92 private_data, struct smbd_scavenger_state);
94 DEBUG(2, ("scavenger: %s parent %s died\n",
95 server_id_str(talloc_tos(), state->scavenger_id),
96 server_id_str(talloc_tos(), &state->parent_id)));
98 exit_server("smbd_scavenger_parent_dead");
101 static void scavenger_sig_term_handler(struct tevent_context *ev,
102 struct tevent_signal *se,
108 exit_server_cleanly("termination signal");
111 static void scavenger_setup_sig_term_handler(struct tevent_context *ev_ctx)
113 struct tevent_signal *se;
115 se = tevent_add_signal(ev_ctx,
118 scavenger_sig_term_handler,
121 exit_server("failed to setup SIGTERM handler");
125 static bool smbd_scavenger_running(struct smbd_scavenger_state *state)
127 if (state->scavenger_id == NULL) {
131 return serverid_exists(state->scavenger_id);
134 static int smbd_scavenger_server_id_destructor(struct server_id *id)
136 serverid_deregister(*id);
140 static bool scavenger_say_hello(int fd, struct server_id self)
142 const uint8_t *msg = (const uint8_t *)&self;
143 size_t remaining = sizeof(self);
146 while (remaining > 0) {
149 ret = sys_write(fd, msg + ofs, remaining);
151 DEBUG(2, ("Failed to write to pipe: %s\n",
158 DEBUG(4, ("scavenger_say_hello: self[%s]\n",
159 server_id_str(talloc_tos(), &self)));
163 static bool scavenger_wait_hello(int fd, struct server_id *child)
165 uint8_t *msg = (uint8_t *)child;
166 size_t remaining = sizeof(*child);
169 while (remaining > 0) {
172 ret = sys_read(fd, msg + ofs, remaining);
174 DEBUG(2, ("Failed to read from pipe: %s\n",
181 DEBUG(4, ("scavenger_say_hello: child[%s]\n",
182 server_id_str(talloc_tos(), child)));
186 static bool smbd_scavenger_start(struct smbd_scavenger_state *state)
188 struct server_id self = messaging_server_id(state->msg);
189 struct tevent_fd *fde = NULL;
195 SMB_ASSERT(server_id_equal(&state->parent_id, &self));
197 if (smbd_scavenger_running(state)) {
198 DEBUG(10, ("scavenger %s already running\n",
199 server_id_str(talloc_tos(),
200 state->scavenger_id)));
204 if (state->scavenger_id != NULL) {
205 DEBUG(10, ("scavenger zombie %s, cleaning up\n",
206 server_id_str(talloc_tos(),
207 state->scavenger_id)));
208 TALLOC_FREE(state->scavenger_id);
211 state->scavenger_id = talloc_zero(state, struct server_id);
212 if (state->scavenger_id == NULL) {
213 DEBUG(2, ("Out of memory\n"));
216 talloc_set_destructor(state->scavenger_id,
217 smbd_scavenger_server_id_destructor);
219 ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
221 DEBUG(2, ("socketpair failed: %s", strerror(errno)));
225 smb_set_close_on_exec(fds[0]);
226 smb_set_close_on_exec(fds[1]);
228 unique_id = serverid_get_random_unique_id();
235 DEBUG(0, ("fork failed: %s", strerror(err)));
248 set_my_unique_id(unique_id);
250 status = reinit_after_fork(state->msg, state->ev, true);
251 if (!NT_STATUS_IS_OK(status)) {
252 DEBUG(2, ("reinit_after_fork failed: %s\n",
254 exit_server("reinit_after_fork failed");
258 prctl_set_comment("smbd-scavenger");
260 state->am_scavenger = true;
261 *state->scavenger_id = messaging_server_id(state->msg);
263 scavenger_setup_sig_term_handler(state->ev);
265 serverid_register(*state->scavenger_id, FLAG_MSG_GENERAL);
267 ok = scavenger_say_hello(fds[1], *state->scavenger_id);
269 DEBUG(2, ("scavenger_say_hello failed\n"));
270 exit_server("scavenger_say_hello failed");
274 fde = tevent_add_fd(state->ev, state->scavenger_id,
275 fds[1], TEVENT_FD_READ,
276 smbd_scavenger_parent_dead, state);
278 DEBUG(2, ("tevent_add_fd(smbd_scavenger_parent_dead) "
280 exit_server("tevent_add_fd(smbd_scavenger_parent_dead) "
284 tevent_fd_set_auto_close(fde);
286 ret = smbd_scavenger_main(state);
288 DEBUG(10, ("scavenger ended: %d\n", ret));
289 exit_server_cleanly("scavenger ended");
296 ok = scavenger_wait_hello(fds[0], state->scavenger_id);
302 fde = tevent_add_fd(state->ev, state->scavenger_id,
303 fds[0], TEVENT_FD_READ,
304 smbd_scavenger_done, state);
309 tevent_fd_set_auto_close(fde);
313 TALLOC_FREE(state->scavenger_id);
317 static void scavenger_add_timer(struct smbd_scavenger_state *state,
318 struct scavenger_message *msg);
320 static void smbd_scavenger_msg(struct messaging_context *msg_ctx,
323 struct server_id src,
326 struct smbd_scavenger_state *state =
327 talloc_get_type_abort(private_data,
328 struct smbd_scavenger_state);
329 TALLOC_CTX *frame = talloc_stackframe();
330 struct server_id self = messaging_server_id(msg_ctx);
331 struct scavenger_message *msg = NULL;
333 DEBUG(10, ("smbd_scavenger_msg: %s got message from %s\n",
334 server_id_str(talloc_tos(), &self),
335 server_id_str(talloc_tos(), &src)));
337 if (server_id_equal(&state->parent_id, &self)) {
340 if (!smbd_scavenger_running(state) &&
341 !smbd_scavenger_start(state))
343 DEBUG(2, ("Failed to start scavenger\n"));
346 DEBUG(10, ("forwarding message to scavenger\n"));
348 status = messaging_send(msg_ctx,
349 *state->scavenger_id, msg_type, data);
350 if (!NT_STATUS_IS_OK(status)) {
351 DEBUG(2, ("forwarding message to scavenger failed: "
352 "%s\n", nt_errstr(status)));
358 if (!state->am_scavenger) {
359 DEBUG(10, ("im not the scavenger: ignore message\n"));
363 if (!server_id_equal(&state->parent_id, &src)) {
364 DEBUG(10, ("scavenger: ignore spurious message\n"));
368 DEBUG(10, ("scavenger: got a message\n"));
369 msg = (struct scavenger_message*)data->data;
370 scavenger_add_timer(state, msg);
375 bool smbd_scavenger_init(TALLOC_CTX *mem_ctx,
376 struct messaging_context *msg,
377 struct tevent_context *ev)
379 struct smbd_scavenger_state *state;
382 if (smbd_scavenger_state) {
383 DEBUG(10, ("smbd_scavenger_init called again\n"));
387 state = talloc_zero(mem_ctx, struct smbd_scavenger_state);
389 DEBUG(2, ("Out of memory\n"));
395 state->parent_id = messaging_server_id(msg);
397 status = messaging_register(msg, state, MSG_SMB_SCAVENGER,
399 if (!NT_STATUS_IS_OK(status)) {
400 DEBUG(2, ("failed to register message handler: %s\n",
405 smbd_scavenger_state = state;
412 void scavenger_schedule_disconnected(struct files_struct *fsp)
415 struct server_id self = messaging_server_id(fsp->conn->sconn->msg_ctx);
416 struct timeval disconnect_time, until;
417 uint64_t timeout_usec;
418 struct scavenger_message msg;
421 nttime_to_timeval(&disconnect_time, fsp->op->global->disconnect_time);
422 timeout_usec = 1000 * fsp->op->global->durable_timeout_msec;
423 until = timeval_add(&disconnect_time,
424 timeout_usec / 1000000,
425 timeout_usec % 1000000);
428 msg.file_id = fsp->file_id;
429 msg.open_persistent_id = fsp->op->global->open_persistent_id;
430 msg.until = timeval_to_nttime(&until);
432 DEBUG(10, ("smbd: %s mark file %s as disconnected at %s with timeout "
434 server_id_str(talloc_tos(), &self),
435 file_id_string_tos(&fsp->file_id),
436 timeval_string(talloc_tos(), &disconnect_time, true),
437 timeval_string(talloc_tos(), &until, true),
438 fsp->op->global->durable_timeout_msec/1000.0));
440 SMB_ASSERT(server_id_is_disconnected(&fsp->op->global->server_id));
441 SMB_ASSERT(!server_id_equal(&self, &smbd_scavenger_state->parent_id));
442 SMB_ASSERT(!smbd_scavenger_state->am_scavenger);
444 msg_blob = data_blob_const(&msg, sizeof(msg));
445 DEBUG(10, ("send message to scavenger\n"));
447 status = messaging_send(smbd_scavenger_state->msg,
448 smbd_scavenger_state->parent_id,
451 if (!NT_STATUS_IS_OK(status)) {
452 DEBUG(2, ("Failed to send message to parent smbd %s "
454 server_id_str(talloc_tos(),
455 &smbd_scavenger_state->parent_id),
456 server_id_str(talloc_tos(), &self),
461 struct scavenger_timer_context {
462 struct smbd_scavenger_state *state;
463 struct scavenger_message msg;
466 static void scavenger_timer(struct tevent_context *ev,
467 struct tevent_timer *te,
468 struct timeval t, void *data)
470 struct scavenger_timer_context *ctx =
471 talloc_get_type_abort(data, struct scavenger_timer_context);
475 DEBUG(10, ("scavenger: do cleanup for file %s at %s\n",
476 file_id_string_tos(&ctx->msg.file_id),
477 timeval_string(talloc_tos(), &t, true)));
479 ok = share_mode_cleanup_disconnected(ctx->msg.file_id,
480 ctx->msg.open_persistent_id);
482 DEBUG(2, ("Failed to cleanup share modes and byte range locks "
483 "for file %s open %lu\n",
484 file_id_string_tos(&ctx->msg.file_id),
485 ctx->msg.open_persistent_id));
488 status = smbXsrv_open_cleanup(ctx->msg.open_persistent_id);
489 if (!NT_STATUS_IS_OK(status)) {
490 DEBUG(2, ("Failed to cleanup open global for file %s open %lu:"
491 " %s\n", file_id_string_tos(&ctx->msg.file_id),
492 ctx->msg.open_persistent_id, nt_errstr(status)));
496 static void scavenger_add_timer(struct smbd_scavenger_state *state,
497 struct scavenger_message *msg)
499 struct tevent_timer *te;
500 struct scavenger_timer_context *ctx;
501 struct timeval until;
503 nttime_to_timeval(&until, msg->until);
505 DEBUG(10, ("scavenger: schedule file %s for cleanup at %s\n",
506 file_id_string_tos(&msg->file_id),
507 timeval_string(talloc_tos(), &until, true)));
509 ctx = talloc_zero(state, struct scavenger_timer_context);
511 DEBUG(2, ("Failed to talloc_zero(scavenger_timer_context)\n"));
518 te = tevent_add_timer(state->ev,
524 DEBUG(2, ("Failed to add scavenger_timer event\n"));
529 /* delete context after handler was running */
530 talloc_steal(te, ctx);