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testprogs: Set functional domain level to 2003.
[Samba.git] / source3 / lib / ctdbd_conn.c
bloba26f41023685509fd85bedaaa6c72c89dea3fe59
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 #include "util_tdb.h"
23 #include "serverid.h"
24 #include "ctdbd_conn.h"
25 #include "system/select.h"
26
27 #include "messages.h"
28
29 /*
30 * It is not possible to include ctdb.h and tdb_compat.h (included via
31 * some other include above) without warnings. This fixes those
32 * warnings.
33 */
34
35 #ifdef typesafe_cb
36 #undef typesafe_cb
37 #endif
38
39 #ifdef typesafe_cb_preargs
40 #undef typesafe_cb_preargs
41 #endif
42
43 #ifdef typesafe_cb_postargs
44 #undef typesafe_cb_postargs
45 #endif
46
47 /* paths to these include files come from --with-ctdb= in configure */
48
49 #include "ctdb.h"
50 #include "ctdb_private.h"
51
52 struct ctdbd_connection {
53 struct messaging_context *msg_ctx;
54 uint32_t reqid;
55 uint32_t our_vnn;
56 uint64_t rand_srvid;
57 int fd;
58 struct tevent_fd *fde;
59
60 bool (*release_ip_handler)(const char *ip_addr, void *private_data);
61 void *release_ip_priv;
62 };
63
64 static uint32_t ctdbd_next_reqid(struct ctdbd_connection *conn)
65 {
66 conn->reqid += 1;
67 if (conn->reqid == 0) {
68 conn->reqid += 1;
69 }
70 return conn->reqid;
71 }
72
73 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
74 uint32_t vnn, uint32_t opcode,
75 uint64_t srvid, uint32_t flags, TDB_DATA data,
76 TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
77 int *cstatus);
78
79 /*
80 * exit on fatal communications errors with the ctdbd daemon
81 */
82 static void cluster_fatal(const char *why)
83 {
84 DEBUG(0,("cluster fatal event: %s - exiting immediately\n", why));
85 /* we don't use smb_panic() as we don't want to delay to write
86 a core file. We need to release this process id immediately
87 so that someone else can take over without getting sharing
88 violations */
89 _exit(1);
90 }
91
92 /*
93 *
94 */
95 static void ctdb_packet_dump(struct ctdb_req_header *hdr)
96 {
97 if (DEBUGLEVEL < 11) {
98 return;
99 }
100 DEBUGADD(11, ("len=%d, magic=%x, vers=%d, gen=%d, op=%d, reqid=%d\n",
101 (int)hdr->length, (int)hdr->ctdb_magic,
102 (int)hdr->ctdb_version, (int)hdr->generation,
103 (int)hdr->operation, (int)hdr->reqid));
104 }
105
106 /*
107 * Register a srvid with ctdbd
108 */
109 NTSTATUS register_with_ctdbd(struct ctdbd_connection *conn, uint64_t srvid)
110 {
111
112 int cstatus;
113 return ctdbd_control(conn, CTDB_CURRENT_NODE,
114 CTDB_CONTROL_REGISTER_SRVID, srvid, 0,
115 tdb_null, NULL, NULL, &cstatus);
116 }
117
118 /*
119 * get our vnn from the cluster
120 */
121 static NTSTATUS get_cluster_vnn(struct ctdbd_connection *conn, uint32_t *vnn)
122 {
123 int32_t cstatus=-1;
124 NTSTATUS status;
125 status = ctdbd_control(conn,
126 CTDB_CURRENT_NODE, CTDB_CONTROL_GET_PNN, 0, 0,
127 tdb_null, NULL, NULL, &cstatus);
128 if (!NT_STATUS_IS_OK(status)) {
129 DEBUG(1, ("ctdbd_control failed: %s\n", nt_errstr(status)));
130 return status;
131 }
132 *vnn = (uint32_t)cstatus;
133 return status;
134 }
135
136 /*
137 * Are we active (i.e. not banned or stopped?)
138 */
139 static bool ctdbd_working(struct ctdbd_connection *conn, uint32_t vnn)
140 {
141 int32_t cstatus=-1;
142 NTSTATUS status;
143 TDB_DATA outdata;
144 struct ctdb_node_map *m;
145 uint32_t failure_flags;
146 bool ret = false;
147 int i;
148
149 status = ctdbd_control(conn, CTDB_CURRENT_NODE,
150 CTDB_CONTROL_GET_NODEMAP, 0, 0,
151 tdb_null, talloc_tos(), &outdata, &cstatus);
152 if (!NT_STATUS_IS_OK(status)) {
153 DEBUG(1, ("ctdbd_control failed: %s\n", nt_errstr(status)));
154 return false;
155 }
156 if ((cstatus != 0) || (outdata.dptr == NULL)) {
157 DEBUG(2, ("Received invalid ctdb data\n"));
158 return false;
159 }
160
161 m = (struct ctdb_node_map *)outdata.dptr;
162
163 for (i=0; i<m->num; i++) {
164 if (vnn == m->nodes[i].pnn) {
165 break;
166 }
167 }
168
169 if (i == m->num) {
170 DEBUG(2, ("Did not find ourselves (node %d) in nodemap\n",
171 (int)vnn));
172 goto fail;
173 }
174
175 failure_flags = NODE_FLAGS_BANNED | NODE_FLAGS_DISCONNECTED
176 | NODE_FLAGS_PERMANENTLY_DISABLED | NODE_FLAGS_STOPPED;
177
178 if ((m->nodes[i].flags & failure_flags) != 0) {
179 DEBUG(2, ("Node has status %x, not active\n",
180 (int)m->nodes[i].flags));
181 goto fail;
182 }
183
184 ret = true;
185 fail:
186 TALLOC_FREE(outdata.dptr);
187 return ret;
188 }
189
190 uint32_t ctdbd_vnn(const struct ctdbd_connection *conn)
191 {
192 return conn->our_vnn;
193 }
194
195 const char *lp_ctdbd_socket(void)
196 {
197 const char *ret;
198
199 ret = lp__ctdbd_socket();
200 if (ret != NULL && strlen(ret) > 0) {
201 return ret;
202 }
203
204 return CTDB_SOCKET;
205 }
206
207 /*
208 * Get us a ctdb connection
209 */
210
211 static int ctdbd_connect(int *pfd)
212 {
213 const char *sockname = lp_ctdbd_socket();
214 struct sockaddr_un addr = { 0, };
215 int fd;
216 socklen_t salen;
217 size_t namelen;
218
219 fd = socket(AF_UNIX, SOCK_STREAM, 0);
220 if (fd == -1) {
221 int err = errno;
222 DEBUG(3, ("Could not create socket: %s\n", strerror(err)));
223 return err;
224 }
225
226 addr.sun_family = AF_UNIX;
227
228 namelen = strlcpy(addr.sun_path, sockname, sizeof(addr.sun_path));
229 if (namelen >= sizeof(addr.sun_path)) {
230 DEBUG(3, ("%s: Socket name too long: %s\n", __func__,
231 sockname));
232 close(fd);
233 return ENAMETOOLONG;
234 }
235
236 salen = sizeof(struct sockaddr_un);
237
238 if (connect(fd, (struct sockaddr *)(void *)&addr, salen) == -1) {
239 int err = errno;
240 DEBUG(1, ("connect(%s) failed: %s\n", sockname,
241 strerror(err)));
242 close(fd);
243 return err;
244 }
245
246 *pfd = fd;
247 return 0;
248 }
249
250 /*
251 * State necessary to defer an incoming message while we are waiting for a
252 * ctdb reply.
253 */
254
255 struct deferred_msg_state {
256 struct messaging_context *msg_ctx;
257 struct messaging_rec *rec;
258 };
259
260 /*
261 * Timed event handler for the deferred message
262 */
263
264 static void deferred_message_dispatch(struct tevent_context *event_ctx,
265 struct tevent_timer *te,
266 struct timeval now,
267 void *private_data)
268 {
269 struct deferred_msg_state *state = talloc_get_type_abort(
270 private_data, struct deferred_msg_state);
271
272 messaging_dispatch_rec(state->msg_ctx, state->rec);
273 TALLOC_FREE(state);
274 TALLOC_FREE(te);
275 }
276
277 /*
278 * Fetch a messaging_rec from an incoming ctdb style message
279 */
280
281 static struct messaging_rec *ctdb_pull_messaging_rec(TALLOC_CTX *mem_ctx,
282 size_t overall_length,
283 struct ctdb_req_message *msg)
284 {
285 struct messaging_rec *result;
286 DATA_BLOB blob;
287 enum ndr_err_code ndr_err;
288
289 if ((overall_length < offsetof(struct ctdb_req_message, data))
290 || (overall_length
291 < offsetof(struct ctdb_req_message, data) + msg->datalen)) {
292
293 cluster_fatal("got invalid msg length");
294 }
295
296 if (!(result = talloc(mem_ctx, struct messaging_rec))) {
297 DEBUG(0, ("talloc failed\n"));
298 return NULL;
299 }
300
301 blob = data_blob_const(msg->data, msg->datalen);
302
303 ndr_err = ndr_pull_struct_blob(
304 &blob, result, result,
305 (ndr_pull_flags_fn_t)ndr_pull_messaging_rec);
306
307 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
308 DEBUG(0, ("ndr_pull_struct_blob failed: %s\n",
309 ndr_errstr(ndr_err)));
310 TALLOC_FREE(result);
311 return NULL;
312 }
313
314 if (DEBUGLEVEL >= 11) {
315 DEBUG(11, ("ctdb_pull_messaging_rec:\n"));
316 NDR_PRINT_DEBUG(messaging_rec, result);
317 }
318
319 return result;
320 }
321
322 static NTSTATUS ctdb_read_packet(int fd, TALLOC_CTX *mem_ctx,
323 struct ctdb_req_header **result)
324 {
325 int timeout = lp_ctdb_timeout();
326 struct ctdb_req_header *req;
327 int ret, revents;
328 uint32_t msglen;
329 NTSTATUS status;
330
331 if (timeout == 0) {
332 timeout = -1;
333 }
334
335 if (timeout != -1) {
336 ret = poll_one_fd(fd, POLLIN, timeout, &revents);
337 if (ret == -1) {
338 return map_nt_error_from_unix(errno);
339 }
340 if (ret == 0) {
341 return NT_STATUS_IO_TIMEOUT;
342 }
343 if (ret != 1) {
344 return NT_STATUS_UNEXPECTED_IO_ERROR;
345 }
346 }
347
348 status = read_data(fd, (char *)&msglen, sizeof(msglen));
349 if (!NT_STATUS_IS_OK(status)) {
350 return status;
351 }
352
353 if (msglen < sizeof(struct ctdb_req_header)) {
354 return NT_STATUS_UNEXPECTED_IO_ERROR;
355 }
356
357 req = talloc_size(mem_ctx, msglen);
358 if (req == NULL) {
359 return NT_STATUS_NO_MEMORY;
360 }
361 talloc_set_name_const(req, "struct ctdb_req_header");
362
363 req->length = msglen;
364
365 status = read_data(fd, ((char *)req) + sizeof(msglen),
366 msglen - sizeof(msglen));
367 if (!NT_STATUS_IS_OK(status)) {
368 return status;
369 }
370
371 *result = req;
372 return NT_STATUS_OK;
373 }
374
375 /*
376 * Read a full ctdbd request. If we have a messaging context, defer incoming
377 * messages that might come in between.
378 */
379
380 static NTSTATUS ctdb_read_req(struct ctdbd_connection *conn, uint32_t reqid,
381 TALLOC_CTX *mem_ctx,
382 struct ctdb_req_header **result)
383 {
384 struct ctdb_req_header *hdr;
385 NTSTATUS status;
386
387 next_pkt:
388
389 status = ctdb_read_packet(conn->fd, mem_ctx, &hdr);
390 if (!NT_STATUS_IS_OK(status)) {
391 DEBUG(0, ("ctdb_read_packet failed: %s\n", nt_errstr(status)));
392 cluster_fatal("ctdbd died\n");
393 }
394
395 DEBUG(11, ("Received ctdb packet\n"));
396 ctdb_packet_dump(hdr);
397
398 if (hdr->operation == CTDB_REQ_MESSAGE) {
399 struct tevent_timer *evt;
400 struct deferred_msg_state *msg_state;
401 struct ctdb_req_message *msg = (struct ctdb_req_message *)hdr;
402
403 if (conn->msg_ctx == NULL) {
404 DEBUG(1, ("Got a message without having a msg ctx, "
405 "dropping msg %llu\n",
406 (long long unsigned)msg->srvid));
407 goto next_pkt;
408 }
409
410 if ((conn->release_ip_handler != NULL)
411 && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
412 bool ret;
413
414 /* must be dispatched immediately */
415 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
416 ret = conn->release_ip_handler((const char *)msg->data,
417 conn->release_ip_priv);
418 TALLOC_FREE(hdr);
419
420 if (ret) {
421 /*
422 * We need to release the ip,
423 * so return an error to the upper layers.
424 *
425 * We make sure we don't trigger this again.
426 */
427 conn->release_ip_handler = NULL;
428 conn->release_ip_priv = NULL;
429 return NT_STATUS_ADDRESS_CLOSED;
430 }
431 goto next_pkt;
432 }
433
434 if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
435 || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)) {
436
437 DEBUG(1, ("ctdb_read_req: Got %s message\n",
438 (msg->srvid == CTDB_SRVID_RECONFIGURE)
439 ? "cluster reconfigure" : "SAMBA_NOTIFY"));
440
441 messaging_send(conn->msg_ctx,
442 messaging_server_id(conn->msg_ctx),
443 MSG_SMB_BRL_VALIDATE, &data_blob_null);
444 TALLOC_FREE(hdr);
445 goto next_pkt;
446 }
447
448 msg_state = talloc(NULL, struct deferred_msg_state);
449 if (msg_state == NULL) {
450 DEBUG(0, ("talloc failed\n"));
451 TALLOC_FREE(hdr);
452 goto next_pkt;
453 }
454
455 if (!(msg_state->rec = ctdb_pull_messaging_rec(
456 msg_state, msg->hdr.length, msg))) {
457 DEBUG(0, ("ctdbd_pull_messaging_rec failed\n"));
458 TALLOC_FREE(msg_state);
459 TALLOC_FREE(hdr);
460 goto next_pkt;
461 }
462
463 TALLOC_FREE(hdr);
464
465 msg_state->msg_ctx = conn->msg_ctx;
466
467 /*
468 * We're waiting for a call reply, but an async message has
469 * crossed. Defer dispatching to the toplevel event loop.
470 */
471 evt = tevent_add_timer(messaging_tevent_context(conn->msg_ctx),
472 messaging_tevent_context(conn->msg_ctx),
473 timeval_zero(),
474 deferred_message_dispatch,
475 msg_state);
476 if (evt == NULL) {
477 DEBUG(0, ("event_add_timed failed\n"));
478 TALLOC_FREE(msg_state);
479 TALLOC_FREE(hdr);
480 goto next_pkt;
481 }
482
483 goto next_pkt;
484 }
485
486 if ((reqid != 0) && (hdr->reqid != reqid)) {
487 /* we got the wrong reply */
488 DEBUG(0,("Discarding mismatched ctdb reqid %u should have "
489 "been %u\n", hdr->reqid, reqid));
490 TALLOC_FREE(hdr);
491 goto next_pkt;
492 }
493
494 *result = talloc_move(mem_ctx, &hdr);
495
496 return NT_STATUS_OK;
497 }
498
499 static int ctdbd_connection_destructor(struct ctdbd_connection *c)
500 {
501 close(c->fd);
502 return 0;
503 }
504 /*
505 * Get us a ctdbd connection
506 */
507
508 static NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
509 struct ctdbd_connection **pconn)
510 {
511 struct ctdbd_connection *conn;
512 int ret;
513 NTSTATUS status;
514
515 if (!(conn = talloc_zero(mem_ctx, struct ctdbd_connection))) {
516 DEBUG(0, ("talloc failed\n"));
517 return NT_STATUS_NO_MEMORY;
518 }
519
520 ret = ctdbd_connect(&conn->fd);
521 if (ret != 0) {
522 status = map_nt_error_from_unix(errno);
523 DEBUG(10, ("ctdbd_connect failed: %s\n", strerror(errno)));
524 goto fail;
525 }
526 talloc_set_destructor(conn, ctdbd_connection_destructor);
527
528 status = get_cluster_vnn(conn, &conn->our_vnn);
529
530 if (!NT_STATUS_IS_OK(status)) {
531 DEBUG(10, ("get_cluster_vnn failed: %s\n", nt_errstr(status)));
532 goto fail;
533 }
534
535 if (!ctdbd_working(conn, conn->our_vnn)) {
536 DEBUG(2, ("Node is not working, can not connect\n"));
537 status = NT_STATUS_INTERNAL_DB_ERROR;
538 goto fail;
539 }
540
541 generate_random_buffer((unsigned char *)&conn->rand_srvid,
542 sizeof(conn->rand_srvid));
543
544 status = register_with_ctdbd(conn, conn->rand_srvid);
545
546 if (!NT_STATUS_IS_OK(status)) {
547 DEBUG(5, ("Could not register random srvid: %s\n",
548 nt_errstr(status)));
549 goto fail;
550 }
551
552 *pconn = conn;
553 return NT_STATUS_OK;
554
555 fail:
556 TALLOC_FREE(conn);
557 return status;
558 }
559
560 /*
561 * Get us a ctdbd connection and register us as a process
562 */
563
564 NTSTATUS ctdbd_messaging_connection(TALLOC_CTX *mem_ctx,
565 struct ctdbd_connection **pconn)
566 {
567 struct ctdbd_connection *conn;
568 NTSTATUS status;
569
570 status = ctdbd_init_connection(mem_ctx, &conn);
571
572 if (!NT_STATUS_IS_OK(status)) {
573 return status;
574 }
575
576 status = register_with_ctdbd(conn, (uint64_t)getpid());
577 if (!NT_STATUS_IS_OK(status)) {
578 goto fail;
579 }
580
581 status = register_with_ctdbd(conn, MSG_SRVID_SAMBA);
582 if (!NT_STATUS_IS_OK(status)) {
583 goto fail;
584 }
585
586 status = register_with_ctdbd(conn, CTDB_SRVID_SAMBA_NOTIFY);
587 if (!NT_STATUS_IS_OK(status)) {
588 goto fail;
589 }
590
591 *pconn = conn;
592 return NT_STATUS_OK;
593
594 fail:
595 TALLOC_FREE(conn);
596 return status;
597 }
598
599 struct messaging_context *ctdb_conn_msg_ctx(struct ctdbd_connection *conn)
600 {
601 return conn->msg_ctx;
602 }
603
604 int ctdbd_conn_get_fd(struct ctdbd_connection *conn)
605 {
606 return conn->fd;
607 }
608
609 /*
610 * Packet handler to receive and handle a ctdb message
611 */
612 static NTSTATUS ctdb_handle_message(struct messaging_context *msg_ctx,
613 struct ctdbd_connection *conn,
614 struct ctdb_req_header *hdr)
615 {
616 struct ctdb_req_message *msg;
617 struct messaging_rec *msg_rec;
618
619 if (hdr->operation != CTDB_REQ_MESSAGE) {
620 DEBUG(0, ("Received async msg of type %u, discarding\n",
621 hdr->operation));
622 return NT_STATUS_INVALID_PARAMETER;
623 }
624
625 msg = (struct ctdb_req_message *)hdr;
626
627 if ((conn->release_ip_handler != NULL)
628 && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
629 bool ret;
630
631 /* must be dispatched immediately */
632 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
633 ret = conn->release_ip_handler((const char *)msg->data,
634 conn->release_ip_priv);
635 if (ret) {
636 /*
637 * We need to release the ip.
638 *
639 * We make sure we don't trigger this again.
640 */
641 conn->release_ip_handler = NULL;
642 conn->release_ip_priv = NULL;
643 }
644 return NT_STATUS_OK;
645 }
646
647 SMB_ASSERT(conn->msg_ctx != NULL);
648
649 if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
650 || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)){
651 DEBUG(0,("Got cluster reconfigure message\n"));
652 /*
653 * when the cluster is reconfigured or someone of the
654 * family has passed away (SAMBA_NOTIFY), we need to
655 * clean the brl database
656 */
657 messaging_send(conn->msg_ctx,
658 messaging_server_id(conn->msg_ctx),
659 MSG_SMB_BRL_VALIDATE, &data_blob_null);
660
661 return NT_STATUS_OK;
662 }
663
664 /* only messages to our pid or the broadcast are valid here */
665 if (msg->srvid != getpid() && msg->srvid != MSG_SRVID_SAMBA) {
666 DEBUG(0,("Got unexpected message with srvid=%llu\n",
667 (unsigned long long)msg->srvid));
668 return NT_STATUS_OK;
669 }
670
671 msg_rec = ctdb_pull_messaging_rec(talloc_tos(), msg->hdr.length, msg);
672 if (msg_rec == NULL) {
673 DEBUG(10, ("ctdb_pull_messaging_rec failed\n"));
674 return NT_STATUS_NO_MEMORY;
675 }
676 messaging_dispatch_rec(conn->msg_ctx, msg_rec);
677 return NT_STATUS_OK;
678 }
679
680 /*
681 * The ctdbd socket is readable asynchronuously
682 */
683
684 static void ctdbd_socket_handler(struct tevent_context *event_ctx,
685 struct tevent_fd *event,
686 uint16 flags,
687 void *private_data)
688 {
689 struct ctdbd_connection *conn = talloc_get_type_abort(
690 private_data, struct ctdbd_connection);
691 struct ctdb_req_header *hdr;
692 NTSTATUS status;
693
694 status = ctdb_read_packet(conn->fd, talloc_tos(), &hdr);
695 if (!NT_STATUS_IS_OK(status)) {
696 DEBUG(0, ("ctdb_read_packet failed: %s\n", nt_errstr(status)));
697 cluster_fatal("ctdbd died\n");
698 }
699
700 status = ctdb_handle_message(conn->msg_ctx, conn, hdr);
701 if (!NT_STATUS_IS_OK(status)) {
702 DEBUG(10, ("could not handle incoming message: %s\n",
703 nt_errstr(status)));
704 }
705 }
706
707 /*
708 * Prepare a ctdbd connection to receive messages
709 */
710
711 NTSTATUS ctdbd_register_msg_ctx(struct ctdbd_connection *conn,
712 struct messaging_context *msg_ctx)
713 {
714 SMB_ASSERT(conn->msg_ctx == NULL);
715 SMB_ASSERT(conn->fde == NULL);
716
717 if (!(conn->fde = tevent_add_fd(messaging_tevent_context(msg_ctx),
718 conn,
719 conn->fd,
720 TEVENT_FD_READ,
721 ctdbd_socket_handler,
722 conn))) {
723 DEBUG(0, ("event_add_fd failed\n"));
724 return NT_STATUS_NO_MEMORY;
725 }
726
727 conn->msg_ctx = msg_ctx;
728
729 return NT_STATUS_OK;
730 }
731
732 /*
733 * Send a messaging message across a ctdbd
734 */
735
736 NTSTATUS ctdbd_messaging_send(struct ctdbd_connection *conn,
737 uint32_t dst_vnn, uint64_t dst_srvid,
738 struct messaging_rec *msg)
739 {
740 DATA_BLOB blob;
741 NTSTATUS status;
742 enum ndr_err_code ndr_err;
743
744 ndr_err = ndr_push_struct_blob(
745 &blob, talloc_tos(), msg,
746 (ndr_push_flags_fn_t)ndr_push_messaging_rec);
747
748 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
749 DEBUG(0, ("ndr_push_struct_blob failed: %s\n",
750 ndr_errstr(ndr_err)));
751 return ndr_map_error2ntstatus(ndr_err);
752 }
753
754 status = ctdbd_messaging_send_blob(conn, dst_vnn, dst_srvid,
755 blob.data, blob.length);
756 TALLOC_FREE(blob.data);
757 return status;
758 }
759
760 NTSTATUS ctdbd_messaging_send_blob(struct ctdbd_connection *conn,
761 uint32_t dst_vnn, uint64_t dst_srvid,
762 const uint8_t *buf, size_t buflen)
763 {
764 struct ctdb_req_message r;
765 struct iovec iov[2];
766 ssize_t nwritten;
767
768 r.hdr.length = offsetof(struct ctdb_req_message, data) + buflen;
769 r.hdr.ctdb_magic = CTDB_MAGIC;
770 r.hdr.ctdb_version = CTDB_PROTOCOL;
771 r.hdr.generation = 1;
772 r.hdr.operation = CTDB_REQ_MESSAGE;
773 r.hdr.destnode = dst_vnn;
774 r.hdr.srcnode = conn->our_vnn;
775 r.hdr.reqid = 0;
776 r.srvid = dst_srvid;
777 r.datalen = buflen;
778
779 DEBUG(10, ("ctdbd_messaging_send: Sending ctdb packet\n"));
780 ctdb_packet_dump(&r.hdr);
781
782 iov[0].iov_base = &r;
783 iov[0].iov_len = offsetof(struct ctdb_req_message, data);
784 iov[1].iov_base = discard_const_p(uint8_t, buf);
785 iov[1].iov_len = buflen;
786
787 nwritten = write_data_iov(conn->fd, iov, ARRAY_SIZE(iov));
788 if (nwritten == -1) {
789 DEBUG(3, ("write_data_iov failed: %s\n", strerror(errno)));
790 cluster_fatal("cluster dispatch daemon msg write error\n");
791 }
792
793 return NT_STATUS_OK;
794 }
795
796 /*
797 * send/recv a generic ctdb control message
798 */
799 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
800 uint32_t vnn, uint32_t opcode,
801 uint64_t srvid, uint32_t flags,
802 TDB_DATA data,
803 TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
804 int *cstatus)
805 {
806 struct ctdb_req_control req;
807 struct ctdb_req_header *hdr;
808 struct ctdb_reply_control *reply = NULL;
809 struct ctdbd_connection *new_conn = NULL;
810 struct iovec iov[2];
811 ssize_t nwritten;
812 NTSTATUS status;
813
814 if (conn == NULL) {
815 status = ctdbd_init_connection(NULL, &new_conn);
816
817 if (!NT_STATUS_IS_OK(status)) {
818 DEBUG(10, ("Could not init temp connection: %s\n",
819 nt_errstr(status)));
820 goto fail;
821 }
822
823 conn = new_conn;
824 }
825
826 ZERO_STRUCT(req);
827 req.hdr.length = offsetof(struct ctdb_req_control, data) + data.dsize;
828 req.hdr.ctdb_magic = CTDB_MAGIC;
829 req.hdr.ctdb_version = CTDB_PROTOCOL;
830 req.hdr.operation = CTDB_REQ_CONTROL;
831 req.hdr.reqid = ctdbd_next_reqid(conn);
832 req.hdr.destnode = vnn;
833 req.opcode = opcode;
834 req.srvid = srvid;
835 req.datalen = data.dsize;
836 req.flags = flags;
837
838 DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
839 ctdb_packet_dump(&req.hdr);
840
841 iov[0].iov_base = &req;
842 iov[0].iov_len = offsetof(struct ctdb_req_control, data);
843 iov[1].iov_base = data.dptr;
844 iov[1].iov_len = data.dsize;
845
846 nwritten = write_data_iov(conn->fd, iov, ARRAY_SIZE(iov));
847 if (nwritten == -1) {
848 DEBUG(3, ("write_data_iov failed: %s\n", strerror(errno)));
849 cluster_fatal("cluster dispatch daemon msg write error\n");
850 }
851
852 if (flags & CTDB_CTRL_FLAG_NOREPLY) {
853 TALLOC_FREE(new_conn);
854 if (cstatus) {
855 *cstatus = 0;
856 }
857 return NT_STATUS_OK;
858 }
859
860 status = ctdb_read_req(conn, req.hdr.reqid, NULL, &hdr);
861
862 if (!NT_STATUS_IS_OK(status)) {
863 DEBUG(10, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
864 goto fail;
865 }
866
867 if (hdr->operation != CTDB_REPLY_CONTROL) {
868 DEBUG(0, ("received invalid reply\n"));
869 goto fail;
870 }
871 reply = (struct ctdb_reply_control *)hdr;
872
873 if (outdata) {
874 if (!(outdata->dptr = (uint8 *)talloc_memdup(
875 mem_ctx, reply->data, reply->datalen))) {
876 TALLOC_FREE(reply);
877 return NT_STATUS_NO_MEMORY;
878 }
879 outdata->dsize = reply->datalen;
880 }
881 if (cstatus) {
882 (*cstatus) = reply->status;
883 }
884
885 status = NT_STATUS_OK;
886
887 fail:
888 TALLOC_FREE(new_conn);
889 TALLOC_FREE(reply);
890 return status;
891 }
892
893 /*
894 * see if a remote process exists
895 */
896 bool ctdbd_process_exists(struct ctdbd_connection *conn, uint32_t vnn, pid_t pid)
897 {
898 struct server_id id;
899 bool result;
900
901 id.pid = pid;
902 id.vnn = vnn;
903
904 if (!ctdb_processes_exist(conn, &id, 1, &result)) {
905 DEBUG(10, ("ctdb_processes_exist failed\n"));
906 return false;
907 }
908 return result;
909 }
910
911 bool ctdb_processes_exist(struct ctdbd_connection *conn,
912 const struct server_id *pids, int num_pids,
913 bool *results)
914 {
915 TALLOC_CTX *frame = talloc_stackframe();
916 int i, num_received;
917 NTSTATUS status;
918 uint32_t *reqids;
919 bool result = false;
920
921 reqids = talloc_array(talloc_tos(), uint32_t, num_pids);
922 if (reqids == NULL) {
923 goto fail;
924 }
925
926 for (i=0; i<num_pids; i++) {
927 struct ctdb_req_control req;
928 pid_t pid;
929 struct iovec iov[2];
930 ssize_t nwritten;
931
932 results[i] = false;
933 reqids[i] = ctdbd_next_reqid(conn);
934
935 ZERO_STRUCT(req);
936
937 /*
938 * pids[i].pid is uint64_t, scale down to pid_t which
939 * is the wire protocol towards ctdb.
940 */
941 pid = pids[i].pid;
942
943 DEBUG(10, ("Requesting PID %d/%d, reqid=%d\n",
944 (int)pids[i].vnn, (int)pid,
945 (int)reqids[i]));
946
947 req.hdr.length = offsetof(struct ctdb_req_control, data);
948 req.hdr.length += sizeof(pid);
949 req.hdr.ctdb_magic = CTDB_MAGIC;
950 req.hdr.ctdb_version = CTDB_PROTOCOL;
951 req.hdr.operation = CTDB_REQ_CONTROL;
952 req.hdr.reqid = reqids[i];
953 req.hdr.destnode = pids[i].vnn;
954 req.opcode = CTDB_CONTROL_PROCESS_EXISTS;
955 req.srvid = 0;
956 req.datalen = sizeof(pid);
957 req.flags = 0;
958
959 DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
960 ctdb_packet_dump(&req.hdr);
961
962 iov[0].iov_base = &req;
963 iov[0].iov_len = offsetof(struct ctdb_req_control, data);
964 iov[1].iov_base = &pid;
965 iov[1].iov_len = sizeof(pid);
966
967 nwritten = write_data_iov(conn->fd, iov, ARRAY_SIZE(iov));
968 if (nwritten == -1) {
969 status = map_nt_error_from_unix(errno);
970 DEBUG(10, ("write_data_iov failed: %s\n",
971 strerror(errno)));
972 goto fail;
973 }
974 }
975
976 num_received = 0;
977
978 while (num_received < num_pids) {
979 struct ctdb_req_header *hdr;
980 struct ctdb_reply_control *reply;
981 uint32_t reqid;
982
983 status = ctdb_read_req(conn, 0, talloc_tos(), &hdr);
984 if (!NT_STATUS_IS_OK(status)) {
985 DEBUG(10, ("ctdb_read_req failed: %s\n",
986 nt_errstr(status)));
987 goto fail;
988 }
989
990 if (hdr->operation != CTDB_REPLY_CONTROL) {
991 DEBUG(10, ("Received invalid reply\n"));
992 goto fail;
993 }
994 reply = (struct ctdb_reply_control *)hdr;
995
996 reqid = reply->hdr.reqid;
997
998 DEBUG(10, ("Received reqid %d\n", (int)reqid));
999
1000 for (i=0; i<num_pids; i++) {
1001 if (reqid == reqids[i]) {
1002 break;
1003 }
1004 }
1005 if (i == num_pids) {
1006 DEBUG(10, ("Received unknown record number %u\n",
1007 (unsigned)reqid));
1008 goto fail;
1009 }
1010 results[i] = ((reply->status) == 0);
1011 TALLOC_FREE(reply);
1012 num_received += 1;
1013 }
1014
1015 result = true;
1016 fail:
1017 TALLOC_FREE(frame);
1018 return result;
1019 }
1020
1021 struct ctdb_vnn_list {
1022 uint32_t vnn;
1023 uint32_t reqid;
1024 unsigned num_srvids;
1025 unsigned num_filled;
1026 uint64_t *srvids;
1027 unsigned *pid_indexes;
1028 };
1029
1030 /*
1031 * Get a list of all vnns mentioned in a list of
1032 * server_ids. vnn_indexes tells where in the vnns array we have to
1033 * place the pids.
1034 */
1035 static bool ctdb_collect_vnns(TALLOC_CTX *mem_ctx,
1036 const struct server_id *pids, unsigned num_pids,
1037 struct ctdb_vnn_list **pvnns,
1038 unsigned *pnum_vnns)
1039 {
1040 struct ctdb_vnn_list *vnns = NULL;
1041 unsigned *vnn_indexes = NULL;
1042 unsigned i, num_vnns = 0;
1043
1044 vnn_indexes = talloc_array(mem_ctx, unsigned, num_pids);
1045 if (vnn_indexes == NULL) {
1046 DEBUG(1, ("talloc_array failed\n"));
1047 goto fail;
1048 }
1049
1050 for (i=0; i<num_pids; i++) {
1051 unsigned j;
1052 uint32_t vnn = pids[i].vnn;
1053
1054 for (j=0; j<num_vnns; j++) {
1055 if (vnn == vnns[j].vnn) {
1056 break;
1057 }
1058 }
1059 vnn_indexes[i] = j;
1060
1061 if (j < num_vnns) {
1062 /*
1063 * Already in the array
1064 */
1065 vnns[j].num_srvids += 1;
1066 continue;
1067 }
1068 vnns = talloc_realloc(mem_ctx, vnns, struct ctdb_vnn_list,
1069 num_vnns+1);
1070 if (vnns == NULL) {
1071 DEBUG(1, ("talloc_realloc failed\n"));
1072 goto fail;
1073 }
1074 vnns[num_vnns].vnn = vnn;
1075 vnns[num_vnns].num_srvids = 1;
1076 vnns[num_vnns].num_filled = 0;
1077 num_vnns += 1;
1078 }
1079 for (i=0; i<num_vnns; i++) {
1080 struct ctdb_vnn_list *vnn = &vnns[i];
1081
1082 vnn->srvids = talloc_array(vnns, uint64_t, vnn->num_srvids);
1083 if (vnn->srvids == NULL) {
1084 DEBUG(1, ("talloc_array failed\n"));
1085 goto fail;
1086 }
1087 vnn->pid_indexes = talloc_array(vnns, unsigned,
1088 vnn->num_srvids);
1089 if (vnn->pid_indexes == NULL) {
1090 DEBUG(1, ("talloc_array failed\n"));
1091 goto fail;
1092 }
1093 }
1094 for (i=0; i<num_pids; i++) {
1095 struct ctdb_vnn_list *vnn = &vnns[vnn_indexes[i]];
1096 vnn->srvids[vnn->num_filled] = pids[i].unique_id;
1097 vnn->pid_indexes[vnn->num_filled] = i;
1098 vnn->num_filled += 1;
1099 }
1100
1101 TALLOC_FREE(vnn_indexes);
1102 *pvnns = vnns;
1103 *pnum_vnns = num_vnns;
1104 return true;
1105 fail:
1106 TALLOC_FREE(vnns);
1107 TALLOC_FREE(vnn_indexes);
1108 return false;
1109 }
1110
1111 bool ctdb_serverids_exist_supported(struct ctdbd_connection *conn)
1112 {
1113 return true;
1114 }
1115
1116 bool ctdb_serverids_exist(struct ctdbd_connection *conn,
1117 const struct server_id *pids, unsigned num_pids,
1118 bool *results)
1119 {
1120 unsigned i, num_received;
1121 NTSTATUS status;
1122 struct ctdb_vnn_list *vnns = NULL;
1123 unsigned num_vnns;
1124
1125 if (!ctdb_collect_vnns(talloc_tos(), pids, num_pids,
1126 &vnns, &num_vnns)) {
1127 DEBUG(1, ("ctdb_collect_vnns failed\n"));
1128 goto fail;
1129 }
1130
1131 for (i=0; i<num_vnns; i++) {
1132 struct ctdb_vnn_list *vnn = &vnns[i];
1133 struct ctdb_req_control req;
1134 struct iovec iov[2];
1135 ssize_t nwritten;
1136
1137 vnn->reqid = ctdbd_next_reqid(conn);
1138
1139 ZERO_STRUCT(req);
1140
1141 DEBUG(10, ("Requesting VNN %d, reqid=%d, num_srvids=%u\n",
1142 (int)vnn->vnn, (int)vnn->reqid, vnn->num_srvids));
1143
1144 req.hdr.length = offsetof(struct ctdb_req_control, data);
1145 req.hdr.ctdb_magic = CTDB_MAGIC;
1146 req.hdr.ctdb_version = CTDB_PROTOCOL;
1147 req.hdr.operation = CTDB_REQ_CONTROL;
1148 req.hdr.reqid = vnn->reqid;
1149 req.hdr.destnode = vnn->vnn;
1150 req.opcode = CTDB_CONTROL_CHECK_SRVIDS;
1151 req.srvid = 0;
1152 req.datalen = sizeof(uint64_t) * vnn->num_srvids;
1153 req.hdr.length += req.datalen;
1154 req.flags = 0;
1155
1156 DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
1157 ctdb_packet_dump(&req.hdr);
1158
1159 iov[0].iov_base = &req;
1160 iov[0].iov_len = offsetof(struct ctdb_req_control, data);
1161 iov[1].iov_base = vnn->srvids;
1162 iov[1].iov_len = req.datalen;
1163
1164 nwritten = write_data_iov(conn->fd, iov, ARRAY_SIZE(iov));
1165 if (nwritten == -1) {
1166 status = map_nt_error_from_unix(errno);
1167 DEBUG(10, ("write_data_iov failed: %s\n",
1168 strerror(errno)));
1169 goto fail;
1170 }
1171 }
1172
1173 num_received = 0;
1174
1175 while (num_received < num_vnns) {
1176 struct ctdb_req_header *hdr;
1177 struct ctdb_reply_control *reply;
1178 struct ctdb_vnn_list *vnn;
1179 uint32_t reqid;
1180 uint8_t *reply_data;
1181
1182 status = ctdb_read_req(conn, 0, talloc_tos(), &hdr);
1183 if (!NT_STATUS_IS_OK(status)) {
1184 DEBUG(1, ("ctdb_read_req failed: %s\n",
1185 nt_errstr(status)));
1186 goto fail;
1187 }
1188
1189 if (hdr->operation != CTDB_REPLY_CONTROL) {
1190 DEBUG(1, ("Received invalid reply %u\n",
1191 (unsigned)reply->hdr.operation));
1192 goto fail;
1193 }
1194 reply = (struct ctdb_reply_control *)hdr;
1195
1196 reqid = reply->hdr.reqid;
1197
1198 DEBUG(10, ("Received reqid %d\n", (int)reqid));
1199
1200 for (i=0; i<num_vnns; i++) {
1201 if (reqid == vnns[i].reqid) {
1202 break;
1203 }
1204 }
1205 if (i == num_vnns) {
1206 DEBUG(1, ("Received unknown reqid number %u\n",
1207 (unsigned)reqid));
1208 goto fail;
1209 }
1210
1211 DEBUG(10, ("Found index %u\n", i));
1212
1213 vnn = &vnns[i];
1214
1215 DEBUG(10, ("Received vnn %u, vnn->num_srvids %u, datalen %u\n",
1216 (unsigned)vnn->vnn, vnn->num_srvids,
1217 (unsigned)reply->datalen));
1218
1219 if (reply->datalen >= ((vnn->num_srvids+7)/8)) {
1220 /*
1221 * Got a real reply
1222 */
1223 reply_data = reply->data;
1224 } else {
1225 /*
1226 * Got an error reply
1227 */
1228 DEBUG(5, ("Received short reply len %d, status %u, "
1229 "errorlen %u\n",
1230 (unsigned)reply->datalen,
1231 (unsigned)reply->status,
1232 (unsigned)reply->errorlen));
1233 dump_data(5, reply->data, reply->errorlen);
1234
1235 /*
1236 * This will trigger everything set to false
1237 */
1238 reply_data = NULL;
1239 }
1240
1241 for (i=0; i<vnn->num_srvids; i++) {
1242 int idx = vnn->pid_indexes[i];
1243
1244 if (pids[i].unique_id ==
1245 SERVERID_UNIQUE_ID_NOT_TO_VERIFY) {
1246 results[idx] = true;
1247 continue;
1248 }
1249 results[idx] =
1250 (reply_data != NULL) &&
1251 ((reply_data[i/8] & (1<<(i%8))) != 0);
1252 }
1253
1254 TALLOC_FREE(reply);
1255 num_received += 1;
1256 }
1257
1258 TALLOC_FREE(vnns);
1259 return true;
1260 fail:
1261 cluster_fatal("serverids_exist failed");
1262 return false;
1263 }
1264
1265 /*
1266 * Get a db path
1267 */
1268 char *ctdbd_dbpath(struct ctdbd_connection *conn,
1269 TALLOC_CTX *mem_ctx, uint32_t db_id)
1270 {
1271 NTSTATUS status;
1272 TDB_DATA data;
1273 int32_t cstatus;
1274
1275 data.dptr = (uint8_t*)&db_id;
1276 data.dsize = sizeof(db_id);
1277
1278 status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1279 CTDB_CONTROL_GETDBPATH, 0, 0, data,
1280 mem_ctx, &data, &cstatus);
1281 if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
1282 DEBUG(0,(__location__ " ctdb_control for getdbpath failed\n"));
1283 return NULL;
1284 }
1285
1286 return (char *)data.dptr;
1287 }
1288
1289 /*
1290 * attach to a ctdb database
1291 */
1292 NTSTATUS ctdbd_db_attach(struct ctdbd_connection *conn,
1293 const char *name, uint32_t *db_id, int tdb_flags)
1294 {
1295 NTSTATUS status;
1296 TDB_DATA data;
1297 int32_t cstatus;
1298 bool persistent = (tdb_flags & TDB_CLEAR_IF_FIRST) == 0;
1299
1300 data = string_term_tdb_data(name);
1301
1302 status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1303 persistent
1304 ? CTDB_CONTROL_DB_ATTACH_PERSISTENT
1305 : CTDB_CONTROL_DB_ATTACH,
1306 tdb_flags, 0, data, NULL, &data, &cstatus);
1307 if (!NT_STATUS_IS_OK(status)) {
1308 DEBUG(0, (__location__ " ctdb_control for db_attach "
1309 "failed: %s\n", nt_errstr(status)));
1310 return status;
1311 }
1312
1313 if (cstatus != 0 || data.dsize != sizeof(uint32_t)) {
1314 DEBUG(0,(__location__ " ctdb_control for db_attach failed\n"));
1315 return NT_STATUS_INTERNAL_ERROR;
1316 }
1317
1318 *db_id = *(uint32_t *)data.dptr;
1319 talloc_free(data.dptr);
1320
1321 if (!(tdb_flags & TDB_SEQNUM)) {
1322 return NT_STATUS_OK;
1323 }
1324
1325 data.dptr = (uint8_t *)db_id;
1326 data.dsize = sizeof(*db_id);
1327
1328 status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1329 CTDB_CONTROL_ENABLE_SEQNUM, 0, 0, data,
1330 NULL, NULL, &cstatus);
1331 if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
1332 DEBUG(0,(__location__ " ctdb_control for enable seqnum "
1333 "failed\n"));
1334 return NT_STATUS_IS_OK(status) ? NT_STATUS_INTERNAL_ERROR :
1335 status;
1336 }
1337
1338 return NT_STATUS_OK;
1339 }
1340
1341 /*
1342 * force the migration of a record to this node
1343 */
1344 NTSTATUS ctdbd_migrate(struct ctdbd_connection *conn, uint32_t db_id,
1345 TDB_DATA key)
1346 {
1347 struct ctdb_req_call req;
1348 struct ctdb_req_header *hdr;
1349 struct iovec iov[2];
1350 ssize_t nwritten;
1351 NTSTATUS status;
1352
1353 ZERO_STRUCT(req);
1354
1355 req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
1356 req.hdr.ctdb_magic = CTDB_MAGIC;
1357 req.hdr.ctdb_version = CTDB_PROTOCOL;
1358 req.hdr.operation = CTDB_REQ_CALL;
1359 req.hdr.reqid = ctdbd_next_reqid(conn);
1360 req.flags = CTDB_IMMEDIATE_MIGRATION;
1361 req.callid = CTDB_NULL_FUNC;
1362 req.db_id = db_id;
1363 req.keylen = key.dsize;
1364
1365 DEBUG(10, ("ctdbd_migrate: Sending ctdb packet\n"));
1366 ctdb_packet_dump(&req.hdr);
1367
1368 iov[0].iov_base = &req;
1369 iov[0].iov_len = offsetof(struct ctdb_req_call, data);
1370 iov[1].iov_base = key.dptr;
1371 iov[1].iov_len = key.dsize;
1372
1373 nwritten = write_data_iov(conn->fd, iov, ARRAY_SIZE(iov));
1374 if (nwritten == -1) {
1375 DEBUG(3, ("write_data_iov failed: %s\n", strerror(errno)));
1376 cluster_fatal("cluster dispatch daemon msg write error\n");
1377 }
1378
1379 status = ctdb_read_req(conn, req.hdr.reqid, NULL, &hdr);
1380
1381 if (!NT_STATUS_IS_OK(status)) {
1382 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1383 goto fail;
1384 }
1385
1386 if (hdr->operation != CTDB_REPLY_CALL) {
1387 DEBUG(0, ("received invalid reply\n"));
1388 status = NT_STATUS_INTERNAL_ERROR;
1389 goto fail;
1390 }
1391
1392 status = NT_STATUS_OK;
1393 fail:
1394
1395 TALLOC_FREE(hdr);
1396 return status;
1397 }
1398
1399 /*
1400 * Fetch a record and parse it
1401 */
1402 NTSTATUS ctdbd_parse(struct ctdbd_connection *conn, uint32_t db_id,
1403 TDB_DATA key, bool local_copy,
1404 void (*parser)(TDB_DATA key, TDB_DATA data,
1405 void *private_data),
1406 void *private_data)
1407 {
1408 struct ctdb_req_call req;
1409 struct ctdb_req_header *hdr = NULL;
1410 struct ctdb_reply_call *reply;
1411 struct iovec iov[2];
1412 ssize_t nwritten;
1413 NTSTATUS status;
1414 uint32_t flags;
1415
1416 flags = local_copy ? CTDB_WANT_READONLY : 0;
1417
1418 ZERO_STRUCT(req);
1419
1420 req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
1421 req.hdr.ctdb_magic = CTDB_MAGIC;
1422 req.hdr.ctdb_version = CTDB_PROTOCOL;
1423 req.hdr.operation = CTDB_REQ_CALL;
1424 req.hdr.reqid = ctdbd_next_reqid(conn);
1425 req.flags = flags;
1426 req.callid = CTDB_FETCH_FUNC;
1427 req.db_id = db_id;
1428 req.keylen = key.dsize;
1429
1430 iov[0].iov_base = &req;
1431 iov[0].iov_len = offsetof(struct ctdb_req_call, data);
1432 iov[1].iov_base = key.dptr;
1433 iov[1].iov_len = key.dsize;
1434
1435 nwritten = write_data_iov(conn->fd, iov, ARRAY_SIZE(iov));
1436 if (nwritten == -1) {
1437 DEBUG(3, ("write_data_iov failed: %s\n", strerror(errno)));
1438 cluster_fatal("cluster dispatch daemon msg write error\n");
1439 }
1440
1441 status = ctdb_read_req(conn, req.hdr.reqid, NULL, &hdr);
1442
1443 if (!NT_STATUS_IS_OK(status)) {
1444 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1445 goto fail;
1446 }
1447
1448 if (hdr->operation != CTDB_REPLY_CALL) {
1449 DEBUG(0, ("received invalid reply\n"));
1450 status = NT_STATUS_INTERNAL_ERROR;
1451 goto fail;
1452 }
1453 reply = (struct ctdb_reply_call *)hdr;
1454
1455 if (reply->datalen == 0) {
1456 /*
1457 * Treat an empty record as non-existing
1458 */
1459 status = NT_STATUS_NOT_FOUND;
1460 goto fail;
1461 }
1462
1463 parser(key, make_tdb_data(&reply->data[0], reply->datalen),
1464 private_data);
1465
1466 status = NT_STATUS_OK;
1467 fail:
1468 TALLOC_FREE(hdr);
1469 return status;
1470 }
1471
1472 /*
1473 Traverse a ctdb database. This uses a kind-of hackish way to open a second
1474 connection to ctdbd to avoid the hairy recursive and async problems with
1475 everything in-line.
1476 */
1477
1478 NTSTATUS ctdbd_traverse(uint32_t db_id,
1479 void (*fn)(TDB_DATA key, TDB_DATA data,
1480 void *private_data),
1481 void *private_data)
1482 {
1483 struct ctdbd_connection *conn;
1484 NTSTATUS status;
1485
1486 TDB_DATA key, data;
1487 struct ctdb_traverse_start t;
1488 int cstatus;
1489
1490 become_root();
1491 status = ctdbd_init_connection(NULL, &conn);
1492 unbecome_root();
1493 if (!NT_STATUS_IS_OK(status)) {
1494 DEBUG(0, ("ctdbd_init_connection failed: %s\n",
1495 nt_errstr(status)));
1496 return status;
1497 }
1498
1499 t.db_id = db_id;
1500 t.srvid = conn->rand_srvid;
1501 t.reqid = ctdbd_next_reqid(conn);
1502
1503 data.dptr = (uint8_t *)&t;
1504 data.dsize = sizeof(t);
1505
1506 status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1507 CTDB_CONTROL_TRAVERSE_START, conn->rand_srvid, 0,
1508 data, NULL, NULL, &cstatus);
1509
1510 if (!NT_STATUS_IS_OK(status) || (cstatus != 0)) {
1511
1512 DEBUG(0,("ctdbd_control failed: %s, %d\n", nt_errstr(status),
1513 cstatus));
1514
1515 if (NT_STATUS_IS_OK(status)) {
1516 /*
1517 * We need a mapping here
1518 */
1519 status = NT_STATUS_UNSUCCESSFUL;
1520 }
1521 TALLOC_FREE(conn);
1522 return status;
1523 }
1524
1525 while (True) {
1526 struct ctdb_req_header *hdr;
1527 struct ctdb_req_message *m;
1528 struct ctdb_rec_data *d;
1529
1530 status = ctdb_read_packet(conn->fd, conn, &hdr);
1531 if (!NT_STATUS_IS_OK(status)) {
1532 DEBUG(0, ("ctdb_read_packet failed: %s\n",
1533 nt_errstr(status)));
1534 cluster_fatal("ctdbd died\n");
1535 }
1536
1537 if (hdr->operation != CTDB_REQ_MESSAGE) {
1538 DEBUG(0, ("Got operation %u, expected a message\n",
1539 (unsigned)hdr->operation));
1540 TALLOC_FREE(conn);
1541 return NT_STATUS_UNEXPECTED_IO_ERROR;
1542 }
1543
1544 m = (struct ctdb_req_message *)hdr;
1545 d = (struct ctdb_rec_data *)&m->data[0];
1546 if (m->datalen < sizeof(uint32_t) || m->datalen != d->length) {
1547 DEBUG(0, ("Got invalid traverse data of length %d\n",
1548 (int)m->datalen));
1549 TALLOC_FREE(conn);
1550 return NT_STATUS_UNEXPECTED_IO_ERROR;
1551 }
1552
1553 key.dsize = d->keylen;
1554 key.dptr = &d->data[0];
1555 data.dsize = d->datalen;
1556 data.dptr = &d->data[d->keylen];
1557
1558 if (key.dsize == 0 && data.dsize == 0) {
1559 /* end of traverse */
1560 TALLOC_FREE(conn);
1561 return NT_STATUS_OK;
1562 }
1563
1564 if (data.dsize < sizeof(struct ctdb_ltdb_header)) {
1565 DEBUG(0, ("Got invalid ltdb header length %d\n",
1566 (int)data.dsize));
1567 TALLOC_FREE(conn);
1568 return NT_STATUS_UNEXPECTED_IO_ERROR;
1569 }
1570 data.dsize -= sizeof(struct ctdb_ltdb_header);
1571 data.dptr += sizeof(struct ctdb_ltdb_header);
1572
1573 if (fn != NULL) {
1574 fn(key, data, private_data);
1575 }
1576 }
1577 return NT_STATUS_OK;
1578 }
1579
1580 /*
1581 This is used to canonicalize a ctdb_sock_addr structure.
1582 */
1583 static void smbd_ctdb_canonicalize_ip(const struct sockaddr_storage *in,
1584 struct sockaddr_storage *out)
1585 {
1586 memcpy(out, in, sizeof (*out));
1587
1588 #ifdef HAVE_IPV6
1589 if (in->ss_family == AF_INET6) {
1590 const char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
1591 const struct sockaddr_in6 *in6 =
1592 (const struct sockaddr_in6 *)in;
1593 struct sockaddr_in *out4 = (struct sockaddr_in *)out;
1594 if (memcmp(&in6->sin6_addr, prefix, 12) == 0) {
1595 memset(out, 0, sizeof(*out));
1596 #ifdef HAVE_SOCK_SIN_LEN
1597 out4->sin_len = sizeof(*out);
1598 #endif
1599 out4->sin_family = AF_INET;
1600 out4->sin_port = in6->sin6_port;
1601 memcpy(&out4->sin_addr, &in6->sin6_addr.s6_addr[12], 4);
1602 }
1603 }
1604 #endif
1605 }
1606
1607 /*
1608 * Register us as a server for a particular tcp connection
1609 */
1610
1611 NTSTATUS ctdbd_register_ips(struct ctdbd_connection *conn,
1612 const struct sockaddr_storage *_server,
1613 const struct sockaddr_storage *_client,
1614 bool (*release_ip_handler)(const char *ip_addr,
1615 void *private_data),
1616 void *private_data)
1617 {
1618 /*
1619 * we still use ctdb_control_tcp for ipv4
1620 * because we want to work against older ctdb
1621 * versions at runtime
1622 */
1623 struct ctdb_control_tcp p4;
1624 struct ctdb_control_tcp_addr p;
1625 TDB_DATA data;
1626 NTSTATUS status;
1627 struct sockaddr_storage client;
1628 struct sockaddr_storage server;
1629
1630 /*
1631 * Only one connection so far
1632 */
1633 SMB_ASSERT(conn->release_ip_handler == NULL);
1634
1635 smbd_ctdb_canonicalize_ip(_client, &client);
1636 smbd_ctdb_canonicalize_ip(_server, &server);
1637
1638 switch (client.ss_family) {
1639 case AF_INET:
1640 memcpy(&p4.dest, &server, sizeof(p4.dest));
1641 memcpy(&p4.src, &client, sizeof(p4.src));
1642 data.dptr = (uint8_t *)&p4;
1643 data.dsize = sizeof(p4);
1644 break;
1645 case AF_INET6:
1646 memcpy(&p.dest.ip6, &server, sizeof(p.dest.ip6));
1647 memcpy(&p.src.ip6, &client, sizeof(p.src.ip6));
1648 data.dptr = (uint8_t *)&p;
1649 data.dsize = sizeof(p);
1650 break;
1651 default:
1652 return NT_STATUS_INTERNAL_ERROR;
1653 }
1654
1655 conn->release_ip_handler = release_ip_handler;
1656 conn->release_ip_priv = private_data;
1657
1658 /*
1659 * We want to be told about IP releases
1660 */
1661
1662 status = register_with_ctdbd(conn, CTDB_SRVID_RELEASE_IP);
1663 if (!NT_STATUS_IS_OK(status)) {
1664 return status;
1665 }
1666
1667 /*
1668 * inform ctdb of our tcp connection, so if IP takeover happens ctdb
1669 * can send an extra ack to trigger a reset for our client, so it
1670 * immediately reconnects
1671 */
1672 return ctdbd_control(conn, CTDB_CURRENT_NODE,
1673 CTDB_CONTROL_TCP_CLIENT, 0,
1674 CTDB_CTRL_FLAG_NOREPLY, data, NULL, NULL, NULL);
1675 }
1676
1677 /*
1678 * We want to handle reconfigure events
1679 */
1680 NTSTATUS ctdbd_register_reconfigure(struct ctdbd_connection *conn)
1681 {
1682 return register_with_ctdbd(conn, CTDB_SRVID_RECONFIGURE);
1683 }
1684
1685 /*
1686 call a control on the local node
1687 */
1688 NTSTATUS ctdbd_control_local(struct ctdbd_connection *conn, uint32_t opcode,
1689 uint64_t srvid, uint32_t flags, TDB_DATA data,
1690 TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
1691 int *cstatus)
1692 {
1693 return ctdbd_control(conn, CTDB_CURRENT_NODE, opcode, srvid, flags, data, mem_ctx, outdata, cstatus);
1694 }
1695
1696 NTSTATUS ctdb_watch_us(struct ctdbd_connection *conn)
1697 {
1698 struct ctdb_client_notify_register reg_data;
1699 size_t struct_len;
1700 NTSTATUS status;
1701 int cstatus;
1702
1703 reg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1704 reg_data.len = 1;
1705 reg_data.notify_data[0] = 0;
1706
1707 struct_len = offsetof(struct ctdb_client_notify_register,
1708 notify_data) + reg_data.len;
1709
1710 status = ctdbd_control_local(
1711 conn, CTDB_CONTROL_REGISTER_NOTIFY, conn->rand_srvid, 0,
1712 make_tdb_data((uint8_t *)&reg_data, struct_len),
1713 NULL, NULL, &cstatus);
1714 if (!NT_STATUS_IS_OK(status)) {
1715 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1716 nt_errstr(status)));
1717 }
1718 return status;
1719 }
1720
1721 NTSTATUS ctdb_unwatch(struct ctdbd_connection *conn)
1722 {
1723 struct ctdb_client_notify_deregister dereg_data;
1724 NTSTATUS status;
1725 int cstatus;
1726
1727 dereg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1728
1729 status = ctdbd_control_local(
1730 conn, CTDB_CONTROL_DEREGISTER_NOTIFY, conn->rand_srvid, 0,
1731 make_tdb_data((uint8_t *)&dereg_data, sizeof(dereg_data)),
1732 NULL, NULL, &cstatus);
1733 if (!NT_STATUS_IS_OK(status)) {
1734 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1735 nt_errstr(status)));
1736 }
1737 return status;
1738 }
1739
1740 NTSTATUS ctdbd_probe(void)
1741 {
1742 /*
1743 * Do a very early check if ctdbd is around to avoid an abort and core
1744 * later
1745 */
1746 struct ctdbd_connection *conn = NULL;
1747 NTSTATUS status;
1748
1749 status = ctdbd_messaging_connection(talloc_tos(), &conn);
1750
1751 /*
1752 * We only care if we can connect.
1753 */
1754 TALLOC_FREE(conn);
1755
1756 return status;
1757 }
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