source: vendor/3.5.0/source3/lib/ctdbd_conn.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 31.2 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Samba internal messaging functions
4 Copyright (C) 2007 by Volker Lendecke
5 Copyright (C) 2007 by Andrew Tridgell
6
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.
11
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.
16
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/>.
19*/
20
21#include "includes.h"
22
23#ifdef CLUSTER_SUPPORT
24
25#include "librpc/gen_ndr/messaging.h"
26#include "librpc/gen_ndr/ndr_messaging.h"
27
28/* paths to these include files come from --with-ctdb= in configure */
29#include "ctdb.h"
30#include "ctdb_private.h"
31
32struct ctdbd_connection {
33 struct messaging_context *msg_ctx;
34 uint32 reqid;
35 uint32 our_vnn;
36 uint64 rand_srvid;
37 struct packet_context *pkt;
38 struct fd_event *fde;
39
40 void (*release_ip_handler)(const char *ip_addr, void *private_data);
41 void *release_ip_priv;
42};
43
44static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
45 uint32_t vnn, uint32 opcode,
46 uint64_t srvid, uint32_t flags, TDB_DATA data,
47 TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
48 int *cstatus);
49
50/*
51 * exit on fatal communications errors with the ctdbd daemon
52 */
53static void cluster_fatal(const char *why)
54{
55 DEBUG(0,("cluster fatal event: %s - exiting immediately\n", why));
56 /* we don't use smb_panic() as we don't want to delay to write
57 a core file. We need to release this process id immediately
58 so that someone else can take over without getting sharing
59 violations */
60 _exit(0);
61}
62
63/*
64 *
65 */
66static void ctdb_packet_dump(struct ctdb_req_header *hdr)
67{
68 if (DEBUGLEVEL < 10) {
69 return;
70 }
71 DEBUGADD(10, ("len=%d, magic=%x, vers=%d, gen=%d, op=%d, reqid=%d\n",
72 (int)hdr->length, (int)hdr->ctdb_magic,
73 (int)hdr->ctdb_version, (int)hdr->generation,
74 (int)hdr->operation, (int)hdr->reqid));
75}
76
77/*
78 * Register a srvid with ctdbd
79 */
80static NTSTATUS register_with_ctdbd(struct ctdbd_connection *conn,
81 uint64_t srvid)
82{
83
84 int cstatus;
85 return ctdbd_control(conn, CTDB_CURRENT_NODE,
86 CTDB_CONTROL_REGISTER_SRVID, srvid, 0,
87 tdb_null, NULL, NULL, &cstatus);
88}
89
90/*
91 * get our vnn from the cluster
92 */
93static NTSTATUS get_cluster_vnn(struct ctdbd_connection *conn, uint32 *vnn)
94{
95 int32_t cstatus=-1;
96 NTSTATUS status;
97 status = ctdbd_control(conn,
98 CTDB_CURRENT_NODE, CTDB_CONTROL_GET_PNN, 0, 0,
99 tdb_null, NULL, NULL, &cstatus);
100 if (!NT_STATUS_IS_OK(status)) {
101 cluster_fatal("ctdbd_control failed\n");
102 }
103 *vnn = (uint32_t)cstatus;
104 return status;
105}
106
107uint32 ctdbd_vnn(const struct ctdbd_connection *conn)
108{
109 return conn->our_vnn;
110}
111
112/*
113 * Get us a ctdb connection
114 */
115
116static NTSTATUS ctdbd_connect(TALLOC_CTX *mem_ctx,
117 struct packet_context **presult)
118{
119 struct packet_context *result;
120 const char *sockname = lp_ctdbd_socket();
121 struct sockaddr_un addr;
122 int fd;
123
124 if (!sockname || !*sockname) {
125 sockname = CTDB_PATH;
126 }
127
128 fd = socket(AF_UNIX, SOCK_STREAM, 0);
129 if (fd == -1) {
130 DEBUG(3, ("Could not create socket: %s\n", strerror(errno)));
131 return map_nt_error_from_unix(errno);
132 }
133
134 ZERO_STRUCT(addr);
135 addr.sun_family = AF_UNIX;
136 strncpy(addr.sun_path, sockname, sizeof(addr.sun_path));
137
138 if (sys_connect(fd, (struct sockaddr *)&addr) == -1) {
139 DEBUG(1, ("connect(%s) failed: %s\n", sockname,
140 strerror(errno)));
141 close(fd);
142 return map_nt_error_from_unix(errno);
143 }
144
145 if (!(result = packet_init(mem_ctx, fd))) {
146 close(fd);
147 return NT_STATUS_NO_MEMORY;
148 }
149
150 *presult = result;
151 return NT_STATUS_OK;
152}
153
154/*
155 * Do we have a complete ctdb packet in the queue?
156 */
157
158static bool ctdb_req_complete(const uint8_t *buf, size_t available,
159 size_t *length,
160 void *private_data)
161{
162 uint32 msglen;
163
164 if (available < sizeof(msglen)) {
165 return False;
166 }
167
168 msglen = *((uint32 *)buf);
169
170 DEBUG(10, ("msglen = %d\n", msglen));
171
172 if (msglen < sizeof(struct ctdb_req_header)) {
173 DEBUG(0, ("Got invalid msglen: %d, expected at least %d for "
174 "the req_header\n", (int)msglen,
175 (int)sizeof(struct ctdb_req_header)));
176 cluster_fatal("ctdbd protocol error\n");
177 }
178
179 if (available < msglen) {
180 return false;
181 }
182
183 *length = msglen;
184 return true;
185}
186
187/*
188 * State necessary to defer an incoming message while we are waiting for a
189 * ctdb reply.
190 */
191
192struct deferred_msg_state {
193 struct messaging_context *msg_ctx;
194 struct messaging_rec *rec;
195};
196
197/*
198 * Timed event handler for the deferred message
199 */
200
201static void deferred_message_dispatch(struct event_context *event_ctx,
202 struct timed_event *te,
203 struct timeval now,
204 void *private_data)
205{
206 struct deferred_msg_state *state = talloc_get_type_abort(
207 private_data, struct deferred_msg_state);
208
209 messaging_dispatch_rec(state->msg_ctx, state->rec);
210 TALLOC_FREE(state);
211 TALLOC_FREE(te);
212}
213
214struct req_pull_state {
215 TALLOC_CTX *mem_ctx;
216 DATA_BLOB req;
217};
218
219/*
220 * Pull a ctdb request out of the incoming packet queue
221 */
222
223static NTSTATUS ctdb_req_pull(uint8_t *buf, size_t length,
224 void *private_data)
225{
226 struct req_pull_state *state = (struct req_pull_state *)private_data;
227
228 state->req.data = talloc_move(state->mem_ctx, &buf);
229 state->req.length = length;
230 return NT_STATUS_OK;
231}
232
233/*
234 * Fetch a messaging_rec from an incoming ctdb style message
235 */
236
237static struct messaging_rec *ctdb_pull_messaging_rec(TALLOC_CTX *mem_ctx,
238 size_t overall_length,
239 struct ctdb_req_message *msg)
240{
241 struct messaging_rec *result;
242 DATA_BLOB blob;
243 enum ndr_err_code ndr_err;
244
245 if ((overall_length < offsetof(struct ctdb_req_message, data))
246 || (overall_length
247 < offsetof(struct ctdb_req_message, data) + msg->datalen)) {
248
249 cluster_fatal("got invalid msg length");
250 }
251
252 if (!(result = TALLOC_P(mem_ctx, struct messaging_rec))) {
253 DEBUG(0, ("talloc failed\n"));
254 return NULL;
255 }
256
257 blob = data_blob_const(msg->data, msg->datalen);
258
259 ndr_err = ndr_pull_struct_blob(
260 &blob, result, NULL, result,
261 (ndr_pull_flags_fn_t)ndr_pull_messaging_rec);
262
263 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
264 DEBUG(0, ("ndr_pull_struct_blob failed: %s\n",
265 ndr_errstr(ndr_err)));
266 TALLOC_FREE(result);
267 return NULL;
268 }
269
270 if (DEBUGLEVEL >= 10) {
271 DEBUG(10, ("ctdb_pull_messaging_rec:\n"));
272 NDR_PRINT_DEBUG(messaging_rec, result);
273 }
274
275 return result;
276}
277
278static NTSTATUS ctdb_packet_fd_read_sync(struct packet_context *ctx)
279{
280 struct timeval timeout;
281 struct timeval *ptimeout;
282
283 timeout = timeval_set(lp_ctdb_timeout(), 0);
284 ptimeout = (timeout.tv_sec != 0) ? &timeout : NULL;
285
286 return packet_fd_read_sync(ctx, ptimeout);
287}
288
289/*
290 * Read a full ctdbd request. If we have a messaging context, defer incoming
291 * messages that might come in between.
292 */
293
294static NTSTATUS ctdb_read_req(struct ctdbd_connection *conn, uint32 reqid,
295 TALLOC_CTX *mem_ctx, void *result)
296{
297 struct ctdb_req_header *hdr;
298 struct req_pull_state state;
299 NTSTATUS status;
300
301 again:
302
303 status = ctdb_packet_fd_read_sync(conn->pkt);
304
305 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_BUSY)) {
306 /* EAGAIN */
307 goto again;
308 } else if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
309 /* EAGAIN */
310 goto again;
311 }
312
313 if (!NT_STATUS_IS_OK(status)) {
314 DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
315 cluster_fatal("ctdbd died\n");
316 }
317
318 next_pkt:
319
320 ZERO_STRUCT(state);
321 state.mem_ctx = mem_ctx;
322
323 if (!packet_handler(conn->pkt, ctdb_req_complete, ctdb_req_pull,
324 &state, &status)) {
325 /*
326 * Not enough data
327 */
328 DEBUG(10, ("not enough data from ctdb socket, retrying\n"));
329 goto again;
330 }
331
332 if (!NT_STATUS_IS_OK(status)) {
333 DEBUG(0, ("Could not read packet: %s\n", nt_errstr(status)));
334 cluster_fatal("ctdbd died\n");
335 }
336
337 hdr = (struct ctdb_req_header *)state.req.data;
338
339 DEBUG(10, ("Received ctdb packet\n"));
340 ctdb_packet_dump(hdr);
341
342 if (hdr->operation == CTDB_REQ_MESSAGE) {
343 struct timed_event *evt;
344 struct deferred_msg_state *msg_state;
345 struct ctdb_req_message *msg = (struct ctdb_req_message *)hdr;
346
347 if (conn->msg_ctx == NULL) {
348 DEBUG(1, ("Got a message without having a msg ctx, "
349 "dropping msg %llu\n",
350 (long long unsigned)msg->srvid));
351 goto next_pkt;
352 }
353
354 if ((conn->release_ip_handler != NULL)
355 && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
356 /* must be dispatched immediately */
357 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
358 conn->release_ip_handler((const char *)msg->data,
359 conn->release_ip_priv);
360 TALLOC_FREE(hdr);
361 goto next_pkt;
362 }
363
364 if (msg->srvid == CTDB_SRVID_RECONFIGURE) {
365 DEBUG(0,("Got cluster reconfigure message in ctdb_read_req\n"));
366 messaging_send(conn->msg_ctx, procid_self(),
367 MSG_SMB_BRL_VALIDATE, &data_blob_null);
368 TALLOC_FREE(hdr);
369 goto next_pkt;
370 }
371
372 if (!(msg_state = TALLOC_P(talloc_autofree_context(), struct deferred_msg_state))) {
373 DEBUG(0, ("talloc failed\n"));
374 TALLOC_FREE(hdr);
375 goto next_pkt;
376 }
377
378 if (!(msg_state->rec = ctdb_pull_messaging_rec(
379 msg_state, state.req.length, msg))) {
380 DEBUG(0, ("ctdbd_pull_messaging_rec failed\n"));
381 TALLOC_FREE(msg_state);
382 TALLOC_FREE(hdr);
383 goto next_pkt;
384 }
385
386 TALLOC_FREE(hdr);
387
388 msg_state->msg_ctx = conn->msg_ctx;
389
390 /*
391 * We're waiting for a call reply, but an async message has
392 * crossed. Defer dispatching to the toplevel event loop.
393 */
394 evt = event_add_timed(conn->msg_ctx->event_ctx,
395 conn->msg_ctx->event_ctx,
396 timeval_zero(),
397 deferred_message_dispatch,
398 msg_state);
399 if (evt == NULL) {
400 DEBUG(0, ("event_add_timed failed\n"));
401 TALLOC_FREE(msg_state);
402 TALLOC_FREE(hdr);
403 goto next_pkt;
404 }
405
406 goto next_pkt;
407 }
408
409 if (hdr->reqid != reqid) {
410 /* we got the wrong reply */
411 DEBUG(0,("Discarding mismatched ctdb reqid %u should have "
412 "been %u\n", hdr->reqid, reqid));
413 TALLOC_FREE(hdr);
414 goto again;
415 }
416
417 *((void **)result) = talloc_move(mem_ctx, &hdr);
418
419 return NT_STATUS_OK;
420}
421
422/*
423 * Get us a ctdbd connection
424 */
425
426NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
427 struct ctdbd_connection **pconn)
428{
429 struct ctdbd_connection *conn;
430 NTSTATUS status;
431
432 if (!(conn = TALLOC_ZERO_P(mem_ctx, struct ctdbd_connection))) {
433 DEBUG(0, ("talloc failed\n"));
434 return NT_STATUS_NO_MEMORY;
435 }
436
437 status = ctdbd_connect(conn, &conn->pkt);
438
439 if (!NT_STATUS_IS_OK(status)) {
440 DEBUG(10, ("ctdbd_connect failed: %s\n", nt_errstr(status)));
441 goto fail;
442 }
443
444 status = get_cluster_vnn(conn, &conn->our_vnn);
445
446 if (!NT_STATUS_IS_OK(status)) {
447 DEBUG(10, ("get_cluster_vnn failed: %s\n", nt_errstr(status)));
448 goto fail;
449 }
450
451 generate_random_buffer((unsigned char *)&conn->rand_srvid,
452 sizeof(conn->rand_srvid));
453
454 status = register_with_ctdbd(conn, conn->rand_srvid);
455
456 if (!NT_STATUS_IS_OK(status)) {
457 DEBUG(5, ("Could not register random srvid: %s\n",
458 nt_errstr(status)));
459 goto fail;
460 }
461
462 *pconn = conn;
463 return NT_STATUS_OK;
464
465 fail:
466 TALLOC_FREE(conn);
467 return status;
468}
469
470/*
471 * Get us a ctdbd connection and register us as a process
472 */
473
474NTSTATUS ctdbd_messaging_connection(TALLOC_CTX *mem_ctx,
475 struct ctdbd_connection **pconn)
476{
477 struct ctdbd_connection *conn;
478 NTSTATUS status;
479
480 status = ctdbd_init_connection(mem_ctx, &conn);
481
482 if (!NT_STATUS_IS_OK(status)) {
483 return status;
484 }
485
486 status = register_with_ctdbd(conn, (uint64_t)sys_getpid());
487 if (!NT_STATUS_IS_OK(status)) {
488 goto fail;
489 }
490
491 status = register_with_ctdbd(conn, MSG_SRVID_SAMBA);
492 if (!NT_STATUS_IS_OK(status)) {
493 goto fail;
494 }
495
496 *pconn = conn;
497 return NT_STATUS_OK;
498
499 fail:
500 TALLOC_FREE(conn);
501 return status;
502}
503
504/*
505 * Packet handler to receive and handle a ctdb message
506 */
507static NTSTATUS ctdb_handle_message(uint8_t *buf, size_t length,
508 void *private_data)
509{
510 struct ctdbd_connection *conn = talloc_get_type_abort(
511 private_data, struct ctdbd_connection);
512 struct ctdb_req_message *msg;
513 struct messaging_rec *msg_rec;
514
515 msg = (struct ctdb_req_message *)buf;
516
517 if (msg->hdr.operation != CTDB_REQ_MESSAGE) {
518 DEBUG(0, ("Received async msg of type %u, discarding\n",
519 msg->hdr.operation));
520 TALLOC_FREE(buf);
521 return NT_STATUS_INVALID_PARAMETER;
522 }
523
524 if ((conn->release_ip_handler != NULL)
525 && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
526 /* must be dispatched immediately */
527 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
528 conn->release_ip_handler((const char *)msg->data,
529 conn->release_ip_priv);
530 TALLOC_FREE(buf);
531 return NT_STATUS_OK;
532 }
533
534 SMB_ASSERT(conn->msg_ctx != NULL);
535
536 if (msg->srvid == CTDB_SRVID_RECONFIGURE) {
537 DEBUG(0,("Got cluster reconfigure message\n"));
538 /*
539 * when the cluster is reconfigured, we need to clean the brl
540 * database
541 */
542 messaging_send(conn->msg_ctx, procid_self(),
543 MSG_SMB_BRL_VALIDATE, &data_blob_null);
544
545 /*
546 * it's possible that we have just rejoined the cluster after
547 * an outage. In that case our pending locks could have been
548 * removed from the lockdb, so retry them once more
549 */
550 message_send_all(conn->msg_ctx, MSG_SMB_UNLOCK, NULL, 0, NULL);
551
552 TALLOC_FREE(buf);
553
554 return NT_STATUS_OK;
555 }
556
557 /* only messages to our pid or the broadcast are valid here */
558 if (msg->srvid != sys_getpid() && msg->srvid != MSG_SRVID_SAMBA) {
559 DEBUG(0,("Got unexpected message with srvid=%llu\n",
560 (unsigned long long)msg->srvid));
561 TALLOC_FREE(buf);
562 return NT_STATUS_OK;
563 }
564
565 if (!(msg_rec = ctdb_pull_messaging_rec(NULL, length, msg))) {
566 DEBUG(10, ("ctdb_pull_messaging_rec failed\n"));
567 TALLOC_FREE(buf);
568 return NT_STATUS_NO_MEMORY;
569 }
570
571 messaging_dispatch_rec(conn->msg_ctx, msg_rec);
572
573 TALLOC_FREE(msg_rec);
574 TALLOC_FREE(buf);
575 return NT_STATUS_OK;
576}
577
578/*
579 * The ctdbd socket is readable asynchronuously
580 */
581
582static void ctdbd_socket_handler(struct event_context *event_ctx,
583 struct fd_event *event,
584 uint16 flags,
585 void *private_data)
586{
587 struct ctdbd_connection *conn = talloc_get_type_abort(
588 private_data, struct ctdbd_connection);
589
590 NTSTATUS status;
591
592 status = packet_fd_read(conn->pkt);
593
594 if (!NT_STATUS_IS_OK(status)) {
595 DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
596 cluster_fatal("ctdbd died\n");
597 }
598
599 while (packet_handler(conn->pkt, ctdb_req_complete,
600 ctdb_handle_message, conn, &status)) {
601 if (!NT_STATUS_IS_OK(status)) {
602 DEBUG(10, ("could not handle incoming message: %s\n",
603 nt_errstr(status)));
604 }
605 }
606}
607
608/*
609 * Prepare a ctdbd connection to receive messages
610 */
611
612NTSTATUS ctdbd_register_msg_ctx(struct ctdbd_connection *conn,
613 struct messaging_context *msg_ctx)
614{
615 SMB_ASSERT(conn->msg_ctx == NULL);
616 SMB_ASSERT(conn->fde == NULL);
617
618 if (!(conn->fde = event_add_fd(msg_ctx->event_ctx, conn,
619 packet_get_fd(conn->pkt),
620 EVENT_FD_READ,
621 ctdbd_socket_handler,
622 conn))) {
623 DEBUG(0, ("event_add_fd failed\n"));
624 return NT_STATUS_NO_MEMORY;
625 }
626
627 conn->msg_ctx = msg_ctx;
628
629 return NT_STATUS_OK;
630}
631
632/*
633 * Send a messaging message across a ctdbd
634 */
635
636NTSTATUS ctdbd_messaging_send(struct ctdbd_connection *conn,
637 uint32 dst_vnn, uint64 dst_srvid,
638 struct messaging_rec *msg)
639{
640 struct ctdb_req_message r;
641 TALLOC_CTX *mem_ctx;
642 DATA_BLOB blob;
643 NTSTATUS status;
644 enum ndr_err_code ndr_err;
645
646 if (!(mem_ctx = talloc_init("ctdbd_messaging_send"))) {
647 DEBUG(0, ("talloc failed\n"));
648 return NT_STATUS_NO_MEMORY;
649 }
650
651 ndr_err = ndr_push_struct_blob(
652 &blob, mem_ctx, NULL, msg,
653 (ndr_push_flags_fn_t)ndr_push_messaging_rec);
654
655 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
656 DEBUG(0, ("ndr_push_struct_blob failed: %s\n",
657 ndr_errstr(ndr_err)));
658 status = ndr_map_error2ntstatus(ndr_err);
659 goto fail;
660 }
661
662 r.hdr.length = offsetof(struct ctdb_req_message, data) + blob.length;
663 r.hdr.ctdb_magic = CTDB_MAGIC;
664 r.hdr.ctdb_version = CTDB_VERSION;
665 r.hdr.generation = 1;
666 r.hdr.operation = CTDB_REQ_MESSAGE;
667 r.hdr.destnode = dst_vnn;
668 r.hdr.srcnode = conn->our_vnn;
669 r.hdr.reqid = 0;
670 r.srvid = dst_srvid;
671 r.datalen = blob.length;
672
673 DEBUG(10, ("ctdbd_messaging_send: Sending ctdb packet\n"));
674 ctdb_packet_dump(&r.hdr);
675
676 status = packet_send(
677 conn->pkt, 2,
678 data_blob_const(&r, offsetof(struct ctdb_req_message, data)),
679 blob);
680
681 if (!NT_STATUS_IS_OK(status)) {
682 DEBUG(0, ("packet_send failed: %s\n", nt_errstr(status)));
683 goto fail;
684 }
685
686 status = packet_flush(conn->pkt);
687
688 if (!NT_STATUS_IS_OK(status)) {
689 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
690 cluster_fatal("cluster dispatch daemon msg write error\n");
691 }
692
693 status = NT_STATUS_OK;
694 fail:
695 TALLOC_FREE(mem_ctx);
696 return status;
697}
698
699/*
700 * send/recv a generic ctdb control message
701 */
702static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
703 uint32_t vnn, uint32 opcode,
704 uint64_t srvid, uint32_t flags,
705 TDB_DATA data,
706 TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
707 int *cstatus)
708{
709 struct ctdb_req_control req;
710 struct ctdb_reply_control *reply = NULL;
711 struct ctdbd_connection *new_conn = NULL;
712 NTSTATUS status;
713
714 /* the samba3 ctdb code can't handle NOREPLY yet */
715 flags &= ~CTDB_CTRL_FLAG_NOREPLY;
716
717 if (conn == NULL) {
718 status = ctdbd_init_connection(NULL, &new_conn);
719
720 if (!NT_STATUS_IS_OK(status)) {
721 DEBUG(10, ("Could not init temp connection: %s\n",
722 nt_errstr(status)));
723 goto fail;
724 }
725
726 conn = new_conn;
727 }
728
729 ZERO_STRUCT(req);
730 req.hdr.length = offsetof(struct ctdb_req_control, data) + data.dsize;
731 req.hdr.ctdb_magic = CTDB_MAGIC;
732 req.hdr.ctdb_version = CTDB_VERSION;
733 req.hdr.operation = CTDB_REQ_CONTROL;
734 req.hdr.reqid = ++conn->reqid;
735 req.hdr.destnode = vnn;
736 req.opcode = opcode;
737 req.srvid = srvid;
738 req.datalen = data.dsize;
739
740 DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
741 ctdb_packet_dump(&req.hdr);
742
743 status = packet_send(
744 conn->pkt, 2,
745 data_blob_const(&req, offsetof(struct ctdb_req_control, data)),
746 data_blob_const(data.dptr, data.dsize));
747
748 if (!NT_STATUS_IS_OK(status)) {
749 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
750 goto fail;
751 }
752
753 status = packet_flush(conn->pkt);
754
755 if (!NT_STATUS_IS_OK(status)) {
756 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
757 cluster_fatal("cluster dispatch daemon control write error\n");
758 }
759
760 if (flags & CTDB_CTRL_FLAG_NOREPLY) {
761 TALLOC_FREE(new_conn);
762 return NT_STATUS_OK;
763 }
764
765 status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
766
767 if (!NT_STATUS_IS_OK(status)) {
768 DEBUG(10, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
769 goto fail;
770 }
771
772 if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
773 DEBUG(0, ("received invalid reply\n"));
774 goto fail;
775 }
776
777 if (outdata) {
778 if (!(outdata->dptr = (uint8 *)talloc_memdup(
779 mem_ctx, reply->data, reply->datalen))) {
780 TALLOC_FREE(reply);
781 return NT_STATUS_NO_MEMORY;
782 }
783 outdata->dsize = reply->datalen;
784 }
785 if (cstatus) {
786 (*cstatus) = reply->status;
787 }
788
789 status = NT_STATUS_OK;
790
791 fail:
792 TALLOC_FREE(new_conn);
793 TALLOC_FREE(reply);
794 return status;
795}
796
797/*
798 * see if a remote process exists
799 */
800bool ctdbd_process_exists(struct ctdbd_connection *conn, uint32 vnn, pid_t pid)
801{
802 NTSTATUS status;
803 TDB_DATA data;
804 int32_t cstatus;
805
806 data.dptr = (uint8_t*)&pid;
807 data.dsize = sizeof(pid);
808
809 status = ctdbd_control(conn, vnn, CTDB_CONTROL_PROCESS_EXISTS, 0, 0,
810 data, NULL, NULL, &cstatus);
811 if (!NT_STATUS_IS_OK(status)) {
812 DEBUG(0, (__location__ " ctdb_control for process_exists "
813 "failed\n"));
814 return False;
815 }
816
817 return cstatus == 0;
818}
819
820/*
821 * Get a db path
822 */
823char *ctdbd_dbpath(struct ctdbd_connection *conn,
824 TALLOC_CTX *mem_ctx, uint32_t db_id)
825{
826 NTSTATUS status;
827 TDB_DATA data;
828 int32_t cstatus;
829
830 data.dptr = (uint8_t*)&db_id;
831 data.dsize = sizeof(db_id);
832
833 status = ctdbd_control(conn, CTDB_CURRENT_NODE,
834 CTDB_CONTROL_GETDBPATH, 0, 0, data,
835 mem_ctx, &data, &cstatus);
836 if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
837 DEBUG(0,(__location__ " ctdb_control for getdbpath failed\n"));
838 return NULL;
839 }
840
841 return (char *)data.dptr;
842}
843
844/*
845 * attach to a ctdb database
846 */
847NTSTATUS ctdbd_db_attach(struct ctdbd_connection *conn,
848 const char *name, uint32_t *db_id, int tdb_flags)
849{
850 NTSTATUS status;
851 TDB_DATA data;
852 int32_t cstatus;
853 bool persistent = (tdb_flags & TDB_CLEAR_IF_FIRST) == 0;
854
855 data.dptr = (uint8_t*)name;
856 data.dsize = strlen(name)+1;
857
858 status = ctdbd_control(conn, CTDB_CURRENT_NODE,
859 persistent
860 ? CTDB_CONTROL_DB_ATTACH_PERSISTENT
861 : CTDB_CONTROL_DB_ATTACH,
862 0, 0, data, NULL, &data, &cstatus);
863 if (!NT_STATUS_IS_OK(status)) {
864 DEBUG(0, (__location__ " ctdb_control for db_attach "
865 "failed: %s\n", nt_errstr(status)));
866 return status;
867 }
868
869 if (cstatus != 0 || data.dsize != sizeof(uint32_t)) {
870 DEBUG(0,(__location__ " ctdb_control for db_attach failed\n"));
871 return NT_STATUS_INTERNAL_ERROR;
872 }
873
874 *db_id = *(uint32_t *)data.dptr;
875 talloc_free(data.dptr);
876
877 if (!(tdb_flags & TDB_SEQNUM)) {
878 return NT_STATUS_OK;
879 }
880
881 data.dptr = (uint8_t *)db_id;
882 data.dsize = sizeof(*db_id);
883
884 status = ctdbd_control(conn, CTDB_CURRENT_NODE,
885 CTDB_CONTROL_ENABLE_SEQNUM, 0, 0, data,
886 NULL, NULL, &cstatus);
887 if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
888 DEBUG(0,(__location__ " ctdb_control for enable seqnum "
889 "failed\n"));
890 return NT_STATUS_IS_OK(status) ? NT_STATUS_INTERNAL_ERROR :
891 status;
892 }
893
894 return NT_STATUS_OK;
895}
896
897/*
898 * force the migration of a record to this node
899 */
900NTSTATUS ctdbd_migrate(struct ctdbd_connection *conn, uint32 db_id,
901 TDB_DATA key)
902{
903 struct ctdb_req_call req;
904 struct ctdb_reply_call *reply;
905 NTSTATUS status;
906
907 ZERO_STRUCT(req);
908
909 req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
910 req.hdr.ctdb_magic = CTDB_MAGIC;
911 req.hdr.ctdb_version = CTDB_VERSION;
912 req.hdr.operation = CTDB_REQ_CALL;
913 req.hdr.reqid = ++conn->reqid;
914 req.flags = CTDB_IMMEDIATE_MIGRATION;
915 req.callid = CTDB_NULL_FUNC;
916 req.db_id = db_id;
917 req.keylen = key.dsize;
918
919 DEBUG(10, ("ctdbd_migrate: Sending ctdb packet\n"));
920 ctdb_packet_dump(&req.hdr);
921
922 status = packet_send(
923 conn->pkt, 2,
924 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
925 data_blob_const(key.dptr, key.dsize));
926
927 if (!NT_STATUS_IS_OK(status)) {
928 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
929 return status;
930 }
931
932 status = packet_flush(conn->pkt);
933
934 if (!NT_STATUS_IS_OK(status)) {
935 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
936 cluster_fatal("cluster dispatch daemon control write error\n");
937 }
938
939 status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
940
941 if (!NT_STATUS_IS_OK(status)) {
942 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
943 goto fail;
944 }
945
946 if (reply->hdr.operation != CTDB_REPLY_CALL) {
947 DEBUG(0, ("received invalid reply\n"));
948 status = NT_STATUS_INTERNAL_ERROR;
949 goto fail;
950 }
951
952 status = NT_STATUS_OK;
953 fail:
954
955 TALLOC_FREE(reply);
956 return status;
957}
958
959/*
960 * remotely fetch a record without locking it or forcing a migration
961 */
962NTSTATUS ctdbd_fetch(struct ctdbd_connection *conn, uint32 db_id,
963 TDB_DATA key, TALLOC_CTX *mem_ctx, TDB_DATA *data)
964{
965 struct ctdb_req_call req;
966 struct ctdb_reply_call *reply;
967 NTSTATUS status;
968
969 ZERO_STRUCT(req);
970
971 req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
972 req.hdr.ctdb_magic = CTDB_MAGIC;
973 req.hdr.ctdb_version = CTDB_VERSION;
974 req.hdr.operation = CTDB_REQ_CALL;
975 req.hdr.reqid = ++conn->reqid;
976 req.flags = 0;
977 req.callid = CTDB_FETCH_FUNC;
978 req.db_id = db_id;
979 req.keylen = key.dsize;
980
981 status = packet_send(
982 conn->pkt, 2,
983 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
984 data_blob_const(key.dptr, key.dsize));
985
986 if (!NT_STATUS_IS_OK(status)) {
987 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
988 return status;
989 }
990
991 status = packet_flush(conn->pkt);
992
993 if (!NT_STATUS_IS_OK(status)) {
994 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
995 cluster_fatal("cluster dispatch daemon control write error\n");
996 }
997
998 status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
999
1000 if (!NT_STATUS_IS_OK(status)) {
1001 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1002 goto fail;
1003 }
1004
1005 if (reply->hdr.operation != CTDB_REPLY_CALL) {
1006 DEBUG(0, ("received invalid reply\n"));
1007 status = NT_STATUS_INTERNAL_ERROR;
1008 goto fail;
1009 }
1010
1011 data->dsize = reply->datalen;
1012 if (data->dsize == 0) {
1013 data->dptr = NULL;
1014 goto done;
1015 }
1016
1017 data->dptr = (uint8 *)talloc_memdup(mem_ctx, &reply->data[0],
1018 reply->datalen);
1019 if (data->dptr == NULL) {
1020 DEBUG(0, ("talloc failed\n"));
1021 status = NT_STATUS_NO_MEMORY;
1022 goto fail;
1023 }
1024
1025 done:
1026 status = NT_STATUS_OK;
1027 fail:
1028 TALLOC_FREE(reply);
1029 return status;
1030}
1031
1032struct ctdbd_traverse_state {
1033 void (*fn)(TDB_DATA key, TDB_DATA data, void *private_data);
1034 void *private_data;
1035};
1036
1037/*
1038 * Handle a traverse record coming in on the ctdbd connection
1039 */
1040
1041static NTSTATUS ctdb_traverse_handler(uint8_t *buf, size_t length,
1042 void *private_data)
1043{
1044 struct ctdbd_traverse_state *state =
1045 (struct ctdbd_traverse_state *)private_data;
1046
1047 struct ctdb_req_message *m;
1048 struct ctdb_rec_data *d;
1049 TDB_DATA key, data;
1050
1051 m = (struct ctdb_req_message *)buf;
1052
1053 if (length < sizeof(*m) || m->hdr.length != length) {
1054 DEBUG(0, ("Got invalid message of length %d\n", (int)length));
1055 TALLOC_FREE(buf);
1056 return NT_STATUS_UNEXPECTED_IO_ERROR;
1057 }
1058
1059 d = (struct ctdb_rec_data *)&m->data[0];
1060 if (m->datalen < sizeof(uint32_t) || m->datalen != d->length) {
1061 DEBUG(0, ("Got invalid traverse data of length %d\n",
1062 (int)m->datalen));
1063 TALLOC_FREE(buf);
1064 return NT_STATUS_UNEXPECTED_IO_ERROR;
1065 }
1066
1067 key.dsize = d->keylen;
1068 key.dptr = &d->data[0];
1069 data.dsize = d->datalen;
1070 data.dptr = &d->data[d->keylen];
1071
1072 if (key.dsize == 0 && data.dsize == 0) {
1073 /* end of traverse */
1074 return NT_STATUS_END_OF_FILE;
1075 }
1076
1077 if (data.dsize < sizeof(struct ctdb_ltdb_header)) {
1078 DEBUG(0, ("Got invalid ltdb header length %d\n",
1079 (int)data.dsize));
1080 TALLOC_FREE(buf);
1081 return NT_STATUS_UNEXPECTED_IO_ERROR;
1082 }
1083 data.dsize -= sizeof(struct ctdb_ltdb_header);
1084 data.dptr += sizeof(struct ctdb_ltdb_header);
1085
1086 if (state->fn) {
1087 state->fn(key, data, state->private_data);
1088 }
1089
1090 TALLOC_FREE(buf);
1091 return NT_STATUS_OK;
1092}
1093
1094/*
1095 Traverse a ctdb database. This uses a kind-of hackish way to open a second
1096 connection to ctdbd to avoid the hairy recursive and async problems with
1097 everything in-line.
1098*/
1099
1100NTSTATUS ctdbd_traverse(uint32 db_id,
1101 void (*fn)(TDB_DATA key, TDB_DATA data,
1102 void *private_data),
1103 void *private_data)
1104{
1105 struct ctdbd_connection *conn;
1106 NTSTATUS status;
1107
1108 TDB_DATA data;
1109 struct ctdb_traverse_start t;
1110 int cstatus;
1111 struct ctdbd_traverse_state state;
1112
1113 status = ctdbd_init_connection(NULL, &conn);
1114 if (!NT_STATUS_IS_OK(status)) {
1115 DEBUG(0, ("ctdbd_init_connection failed: %s\n",
1116 nt_errstr(status)));
1117 return status;
1118 }
1119
1120 t.db_id = db_id;
1121 t.srvid = conn->rand_srvid;
1122 t.reqid = ++conn->reqid;
1123
1124 data.dptr = (uint8_t *)&t;
1125 data.dsize = sizeof(t);
1126
1127 status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1128 CTDB_CONTROL_TRAVERSE_START, conn->rand_srvid, 0,
1129 data, NULL, NULL, &cstatus);
1130
1131 if (!NT_STATUS_IS_OK(status) || (cstatus != 0)) {
1132
1133 DEBUG(0,("ctdbd_control failed: %s, %d\n", nt_errstr(status),
1134 cstatus));
1135
1136 if (NT_STATUS_IS_OK(status)) {
1137 /*
1138 * We need a mapping here
1139 */
1140 status = NT_STATUS_UNSUCCESSFUL;
1141 }
1142 goto done;
1143 }
1144
1145 state.fn = fn;
1146 state.private_data = private_data;
1147
1148 while (True) {
1149
1150 status = NT_STATUS_OK;
1151
1152 if (packet_handler(conn->pkt, ctdb_req_complete,
1153 ctdb_traverse_handler, &state, &status)) {
1154
1155 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1156 status = NT_STATUS_OK;
1157 break;
1158 }
1159
1160 /*
1161 * There might be more in the queue
1162 */
1163 continue;
1164 }
1165
1166 if (!NT_STATUS_IS_OK(status)) {
1167 break;
1168 }
1169
1170 status = ctdb_packet_fd_read_sync(conn->pkt);
1171
1172 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1173 /*
1174 * There might be more in the queue
1175 */
1176 continue;
1177 }
1178
1179 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1180 status = NT_STATUS_OK;
1181 break;
1182 }
1183
1184 if (!NT_STATUS_IS_OK(status)) {
1185 DEBUG(0, ("packet_fd_read_sync failed: %s\n", nt_errstr(status)));
1186 cluster_fatal("ctdbd died\n");
1187 }
1188 }
1189
1190 done:
1191 TALLOC_FREE(conn);
1192 return status;
1193}
1194
1195/*
1196 This is used to canonicalize a ctdb_sock_addr structure.
1197*/
1198static void smbd_ctdb_canonicalize_ip(const struct sockaddr_storage *in,
1199 struct sockaddr_storage *out)
1200{
1201 memcpy(out, in, sizeof (*out));
1202
1203#ifdef HAVE_IPV6
1204 if (in->ss_family == AF_INET6) {
1205 const char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
1206 const struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)in;
1207 struct sockaddr_in *out4 = (struct sockaddr_in *)out;
1208 if (memcmp(&in6->sin6_addr, prefix, 12) == 0) {
1209 memset(out, 0, sizeof(*out));
1210#ifdef HAVE_SOCK_SIN_LEN
1211 out4->sin_len = sizeof(*out);
1212#endif
1213 out4->sin_family = AF_INET;
1214 out4->sin_port = in6->sin6_port;
1215 memcpy(&out4->sin_addr, &in6->sin6_addr.s6_addr32[3], 4);
1216 }
1217 }
1218#endif
1219}
1220
1221/*
1222 * Register us as a server for a particular tcp connection
1223 */
1224
1225NTSTATUS ctdbd_register_ips(struct ctdbd_connection *conn,
1226 const struct sockaddr_storage *_server,
1227 const struct sockaddr_storage *_client,
1228 void (*release_ip_handler)(const char *ip_addr,
1229 void *private_data),
1230 void *private_data)
1231{
1232 /*
1233 * we still use ctdb_control_tcp for ipv4
1234 * because we want to work against older ctdb
1235 * versions at runtime
1236 */
1237 struct ctdb_control_tcp p4;
1238#ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1239 struct ctdb_control_tcp_addr p;
1240#endif
1241 TDB_DATA data;
1242 NTSTATUS status;
1243 struct sockaddr_storage client;
1244 struct sockaddr_storage server;
1245
1246 /*
1247 * Only one connection so far
1248 */
1249 SMB_ASSERT(conn->release_ip_handler == NULL);
1250
1251 smbd_ctdb_canonicalize_ip(_client, &client);
1252 smbd_ctdb_canonicalize_ip(_server, &server);
1253
1254 switch (client.ss_family) {
1255 case AF_INET:
1256 p4.dest = *(struct sockaddr_in *)&server;
1257 p4.src = *(struct sockaddr_in *)&client;
1258 data.dptr = (uint8_t *)&p4;
1259 data.dsize = sizeof(p4);
1260 break;
1261#ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1262 case AF_INET6:
1263 p.dest.ip6 = *(struct sockaddr_in6 *)&server;
1264 p.src.ip6 = *(struct sockaddr_in6 *)&client;
1265 data.dptr = (uint8_t *)&p;
1266 data.dsize = sizeof(p);
1267 break;
1268#endif
1269 default:
1270 return NT_STATUS_INTERNAL_ERROR;
1271 }
1272
1273 conn->release_ip_handler = release_ip_handler;
1274
1275 /*
1276 * We want to be told about IP releases
1277 */
1278
1279 status = register_with_ctdbd(conn, CTDB_SRVID_RELEASE_IP);
1280 if (!NT_STATUS_IS_OK(status)) {
1281 return status;
1282 }
1283
1284 /*
1285 * inform ctdb of our tcp connection, so if IP takeover happens ctdb
1286 * can send an extra ack to trigger a reset for our client, so it
1287 * immediately reconnects
1288 */
1289 return ctdbd_control(conn, CTDB_CURRENT_NODE,
1290 CTDB_CONTROL_TCP_CLIENT, 0,
1291 CTDB_CTRL_FLAG_NOREPLY, data, NULL, NULL, NULL);
1292}
1293
1294/*
1295 * We want to handle reconfigure events
1296 */
1297NTSTATUS ctdbd_register_reconfigure(struct ctdbd_connection *conn)
1298{
1299 return register_with_ctdbd(conn, CTDB_SRVID_RECONFIGURE);
1300}
1301
1302/*
1303 call a control on the local node
1304 */
1305NTSTATUS ctdbd_control_local(struct ctdbd_connection *conn, uint32 opcode,
1306 uint64_t srvid, uint32_t flags, TDB_DATA data,
1307 TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
1308 int *cstatus)
1309{
1310 return ctdbd_control(conn, CTDB_CURRENT_NODE, opcode, srvid, flags, data, mem_ctx, outdata, cstatus);
1311}
1312
1313#else
1314
1315NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
1316 struct ctdbd_connection **pconn)
1317{
1318 return NT_STATUS_NOT_IMPLEMENTED;
1319}
1320
1321#endif
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