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|
/*
Unix SMB/CIFS implementation.
Samba internal messaging functions
Copyright (C) 2007 by Volker Lendecke
Copyright (C) 2007 by Andrew Tridgell
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#ifdef CLUSTER_SUPPORT
#include "librpc/gen_ndr/messaging.h"
#include "librpc/gen_ndr/ndr_messaging.h"
/* paths to these include files come from --with-ctdb= in configure */
#include "ctdb.h"
#include "ctdb_private.h"
struct ctdbd_connection {
struct messaging_context *msg_ctx;
uint32 reqid;
uint32 our_vnn;
uint64 rand_srvid;
struct packet_context *pkt;
struct fd_event *fde;
void (*release_ip_handler)(const char *ip_addr, void *private_data);
void *release_ip_priv;
};
static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
uint32_t vnn, uint32 opcode,
uint64_t srvid, TDB_DATA data,
TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
int *cstatus);
/*
* exit on fatal communications errors with the ctdbd daemon
*/
static void cluster_fatal(const char *why)
{
DEBUG(0,("cluster fatal event: %s - exiting immediately\n", why));
/* we don't use smb_panic() as we don't want to delay to write
a core file. We need to release this process id immediately
so that someone else can take over without getting sharing
violations */
_exit(0);
}
/*
*
*/
static void ctdb_packet_dump(struct ctdb_req_header *hdr)
{
if (DEBUGLEVEL < 10) {
return;
}
DEBUGADD(10, ("len=%d, magic=%x, vers=%d, gen=%d, op=%d, reqid=%d\n",
(int)hdr->length, (int)hdr->ctdb_magic,
(int)hdr->ctdb_version, (int)hdr->generation,
(int)hdr->operation, (int)hdr->reqid));
}
/*
* Register a srvid with ctdbd
*/
static NTSTATUS register_with_ctdbd(struct ctdbd_connection *conn,
uint64_t srvid)
{
int cstatus;
return ctdbd_control(conn, CTDB_CURRENT_NODE,
CTDB_CONTROL_REGISTER_SRVID, srvid,
tdb_null, NULL, NULL, &cstatus);
}
/*
* get our vnn from the cluster
*/
static NTSTATUS get_cluster_vnn(struct ctdbd_connection *conn, uint32 *vnn)
{
int32_t cstatus=-1;
NTSTATUS status;
status = ctdbd_control(conn,
CTDB_CURRENT_NODE, CTDB_CONTROL_GET_PNN, 0,
tdb_null, NULL, NULL, &cstatus);
if (!NT_STATUS_IS_OK(status)) {
cluster_fatal("ctdbd_control failed\n");
}
*vnn = (uint32_t)cstatus;
return status;
}
uint32 ctdbd_vnn(const struct ctdbd_connection *conn)
{
return conn->our_vnn;
}
/*
* Get us a ctdb connection
*/
static NTSTATUS ctdbd_connect(TALLOC_CTX *mem_ctx,
struct packet_context **presult)
{
struct packet_context *result;
const char *sockname = lp_ctdbd_socket();
struct sockaddr_un addr;
int fd;
if (!sockname || !*sockname) {
sockname = CTDB_PATH;
}
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd == -1) {
DEBUG(3, ("Could not create socket: %s\n", strerror(errno)));
return map_nt_error_from_unix(errno);
}
ZERO_STRUCT(addr);
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, sockname, sizeof(addr.sun_path));
if (connect(fd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
DEBUG(0, ("connect(%s) failed: %s\n", sockname,
strerror(errno)));
close(fd);
return map_nt_error_from_unix(errno);
}
if (!(result = packet_init(mem_ctx, fd))) {
close(fd);
return NT_STATUS_NO_MEMORY;
}
*presult = result;
return NT_STATUS_OK;
}
/*
* Do we have a complete ctdb packet in the queue?
*/
static bool ctdb_req_complete(const struct data_blob *data,
size_t *length,
void *private_data)
{
uint32 msglen;
if (data->length < sizeof(msglen)) {
return False;
}
msglen = *((uint32 *)data->data);
DEBUG(10, ("msglen = %d\n", msglen));
if (msglen < sizeof(struct ctdb_req_header)) {
DEBUG(0, ("Got invalid msglen: %d, expected at least %d for "
"the req_header\n", (int)msglen,
(int)sizeof(struct ctdb_req_header)));
cluster_fatal("ctdbd protocol error\n");
}
if (data->length >= msglen) {
*length = msglen;
return True;
}
return False;
}
/*
* State necessary to defer an incoming message while we are waiting for a
* ctdb reply.
*/
struct deferred_msg_state {
struct messaging_context *msg_ctx;
struct messaging_rec *rec;
};
/*
* Timed event handler for the deferred message
*/
static void deferred_message_dispatch(struct event_context *event_ctx,
struct timed_event *te,
const struct timeval *now,
void *private_data)
{
struct deferred_msg_state *state = talloc_get_type_abort(
private_data, struct deferred_msg_state);
messaging_dispatch_rec(state->msg_ctx, state->rec);
TALLOC_FREE(state);
TALLOC_FREE(te);
}
struct req_pull_state {
TALLOC_CTX *mem_ctx;
DATA_BLOB req;
};
/*
* Pull a ctdb request out of the incoming packet queue
*/
static NTSTATUS ctdb_req_pull(const struct data_blob *data,
void *private_data)
{
struct req_pull_state *state = (struct req_pull_state *)private_data;
state->req = data_blob_talloc(state->mem_ctx, data->data,
data->length);
if (state->req.data == NULL) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
/*
* Fetch a messaging_rec from an incoming ctdb style message
*/
static struct messaging_rec *ctdb_pull_messaging_rec(TALLOC_CTX *mem_ctx,
size_t overall_length,
struct ctdb_req_message *msg)
{
struct messaging_rec *result;
DATA_BLOB blob;
enum ndr_err_code ndr_err;
if ((overall_length < offsetof(struct ctdb_req_message, data))
|| (overall_length
< offsetof(struct ctdb_req_message, data) + msg->datalen)) {
cluster_fatal("got invalid msg length");
}
if (!(result = TALLOC_P(mem_ctx, struct messaging_rec))) {
DEBUG(0, ("talloc failed\n"));
return NULL;
}
blob = data_blob_const(msg->data, msg->datalen);
ndr_err = ndr_pull_struct_blob(
&blob, result, result,
(ndr_pull_flags_fn_t)ndr_pull_messaging_rec);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(0, ("ndr_pull_struct_blob failed: %s\n",
ndr_errstr(ndr_err)));
TALLOC_FREE(result);
return NULL;
}
if (DEBUGLEVEL >= 10) {
DEBUG(10, ("ctdb_pull_messaging_rec:\n"));
NDR_PRINT_DEBUG(messaging_rec, result);
}
return result;
}
/*
* Read a full ctdbd request. If we have a messaging context, defer incoming
* messages that might come in between.
*/
static NTSTATUS ctdb_read_req(struct ctdbd_connection *conn, uint32 reqid,
TALLOC_CTX *mem_ctx, void *result)
{
struct ctdb_req_header *hdr;
struct req_pull_state state;
NTSTATUS status;
again:
status = packet_fd_read_sync(conn->pkt);
if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_BUSY)) {
/* EAGAIN */
goto again;
} else if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
/* EAGAIN */
goto again;
}
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
cluster_fatal("ctdbd died\n");
}
next_pkt:
ZERO_STRUCT(state);
state.mem_ctx = mem_ctx;
if (!packet_handler(conn->pkt, ctdb_req_complete, ctdb_req_pull,
&state, &status)) {
/*
* Not enough data
*/
DEBUG(10, ("not enough data from ctdb socket, retrying\n"));
goto again;
}
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Could not read packet: %s\n", nt_errstr(status)));
cluster_fatal("ctdbd died\n");
}
hdr = (struct ctdb_req_header *)state.req.data;
DEBUG(10, ("Received ctdb packet\n"));
ctdb_packet_dump(hdr);
if (hdr->operation == CTDB_REQ_MESSAGE) {
struct timed_event *evt;
struct deferred_msg_state *msg_state;
struct ctdb_req_message *msg = (struct ctdb_req_message *)hdr;
if (conn->msg_ctx == NULL) {
DEBUG(1, ("Got a message without having a msg ctx, "
"dropping msg %llu\n",
(long long unsigned)msg->srvid));
goto next_pkt;
}
if ((conn->release_ip_handler != NULL)
&& (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
/* must be dispatched immediately */
DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
conn->release_ip_handler((const char *)msg->data,
conn->release_ip_priv);
TALLOC_FREE(hdr);
goto next_pkt;
}
if (!(msg_state = TALLOC_P(NULL, struct deferred_msg_state))) {
DEBUG(0, ("talloc failed\n"));
TALLOC_FREE(hdr);
goto next_pkt;
}
if (!(msg_state->rec = ctdb_pull_messaging_rec(
msg_state, state.req.length, msg))) {
DEBUG(0, ("ctdbd_pull_messaging_rec failed\n"));
TALLOC_FREE(msg_state);
TALLOC_FREE(hdr);
goto next_pkt;
}
TALLOC_FREE(hdr);
msg_state->msg_ctx = conn->msg_ctx;
/*
* We're waiting for a call reply, but an async message has
* crossed. Defer dispatching to the toplevel event loop.
*/
evt = event_add_timed(conn->msg_ctx->event_ctx,
conn->msg_ctx->event_ctx,
timeval_zero(),
"deferred_message_dispatch",
deferred_message_dispatch,
msg_state);
if (evt == NULL) {
DEBUG(0, ("event_add_timed failed\n"));
TALLOC_FREE(msg_state);
TALLOC_FREE(hdr);
goto next_pkt;
}
goto next_pkt;
}
if (hdr->reqid != reqid) {
/* we got the wrong reply */
DEBUG(0,("Discarding mismatched ctdb reqid %u should have "
"been %u\n", hdr->reqid, reqid));
TALLOC_FREE(hdr);
goto again;
}
*((void **)result) = talloc_move(mem_ctx, &hdr);
return NT_STATUS_OK;
}
/*
* Get us a ctdbd connection
*/
NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
struct ctdbd_connection **pconn)
{
struct ctdbd_connection *conn;
NTSTATUS status;
if (!(conn = TALLOC_ZERO_P(mem_ctx, struct ctdbd_connection))) {
DEBUG(0, ("talloc failed\n"));
return NT_STATUS_NO_MEMORY;
}
status = ctdbd_connect(conn, &conn->pkt);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("ctdbd_connect failed: %s\n", nt_errstr(status)));
goto fail;
}
status = get_cluster_vnn(conn, &conn->our_vnn);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("get_cluster_vnn failed: %s\n", nt_errstr(status)));
goto fail;
}
generate_random_buffer((unsigned char *)&conn->rand_srvid,
sizeof(conn->rand_srvid));
status = register_with_ctdbd(conn, conn->rand_srvid);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(5, ("Could not register random srvid: %s\n",
nt_errstr(status)));
goto fail;
}
*pconn = conn;
return NT_STATUS_OK;
fail:
TALLOC_FREE(conn);
return status;
}
/*
* Get us a ctdbd connection and register us as a process
*/
NTSTATUS ctdbd_messaging_connection(TALLOC_CTX *mem_ctx,
struct ctdbd_connection **pconn)
{
struct ctdbd_connection *conn;
NTSTATUS status;
status = ctdbd_init_connection(mem_ctx, &conn);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
status = register_with_ctdbd(conn, (uint64_t)sys_getpid());
if (!NT_STATUS_IS_OK(status)) {
goto fail;
}
status = register_with_ctdbd(conn, MSG_SRVID_SAMBA);
if (!NT_STATUS_IS_OK(status)) {
goto fail;
}
*pconn = conn;
return NT_STATUS_OK;
fail:
TALLOC_FREE(conn);
return status;
}
/*
* Packet handler to receive and handle a ctdb message
*/
static NTSTATUS ctdb_handle_message(const struct data_blob *data,
void *private_data)
{
struct ctdbd_connection *conn = talloc_get_type_abort(
private_data, struct ctdbd_connection);
struct ctdb_req_message *msg;
struct messaging_rec *msg_rec;
msg = (struct ctdb_req_message *)data->data;
if (msg->hdr.operation != CTDB_REQ_MESSAGE) {
DEBUG(0, ("Received async msg of type %u, discarding\n",
msg->hdr.operation));
return NT_STATUS_INVALID_PARAMETER;
}
if ((conn->release_ip_handler != NULL)
&& (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
/* must be dispatched immediately */
DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
conn->release_ip_handler((const char *)msg->data,
conn->release_ip_priv);
return NT_STATUS_OK;
}
SMB_ASSERT(conn->msg_ctx != NULL);
if (msg->srvid == CTDB_SRVID_RECONFIGURE) {
DEBUG(0,("Got cluster reconfigure message\n"));
/*
* when the cluster is reconfigured, we need to clean the brl
* database
*/
messaging_send(conn->msg_ctx, procid_self(),
MSG_SMB_BRL_VALIDATE, &data_blob_null);
/*
* it's possible that we have just rejoined the cluster after
* an outage. In that case our pending locks could have been
* removed from the lockdb, so retry them once more
*/
message_send_all(conn->msg_ctx, MSG_SMB_UNLOCK, NULL, 0, NULL);
return NT_STATUS_OK;
}
/* only messages to our pid or the broadcast are valid here */
if (msg->srvid != sys_getpid() && msg->srvid != MSG_SRVID_SAMBA) {
DEBUG(0,("Got unexpected message with srvid=%llu\n",
(unsigned long long)msg->srvid));
return NT_STATUS_OK;
}
if (!(msg_rec = ctdb_pull_messaging_rec(NULL, data->length, msg))) {
DEBUG(10, ("ctdb_pull_messaging_rec failed\n"));
return NT_STATUS_NO_MEMORY;
}
messaging_dispatch_rec(conn->msg_ctx, msg_rec);
TALLOC_FREE(msg_rec);
return NT_STATUS_OK;
}
/*
* The ctdbd socket is readable asynchronuously
*/
static void ctdbd_socket_handler(struct event_context *event_ctx,
struct fd_event *event,
uint16 flags,
void *private_data)
{
struct ctdbd_connection *conn = talloc_get_type_abort(
private_data, struct ctdbd_connection);
NTSTATUS status;
status = packet_fd_read(conn->pkt);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
cluster_fatal("ctdbd died\n");
}
while (packet_handler(conn->pkt, ctdb_req_complete,
ctdb_handle_message, conn, &status)) {
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("could not handle incoming message: %s\n",
nt_errstr(status)));
}
}
}
/*
* Prepare a ctdbd connection to receive messages
*/
NTSTATUS ctdbd_register_msg_ctx(struct ctdbd_connection *conn,
struct messaging_context *msg_ctx)
{
SMB_ASSERT(conn->msg_ctx == NULL);
SMB_ASSERT(conn->fde == NULL);
if (!(conn->fde = event_add_fd(msg_ctx->event_ctx, conn,
packet_get_fd(conn->pkt),
EVENT_FD_READ,
ctdbd_socket_handler,
conn))) {
DEBUG(0, ("event_add_fd failed\n"));
return NT_STATUS_NO_MEMORY;
}
conn->msg_ctx = msg_ctx;
return NT_STATUS_OK;
}
/*
* Send a messaging message across a ctdbd
*/
NTSTATUS ctdbd_messaging_send(struct ctdbd_connection *conn,
uint32 dst_vnn, uint64 dst_srvid,
struct messaging_rec *msg)
{
struct ctdb_req_message r;
TALLOC_CTX *mem_ctx;
DATA_BLOB blob;
NTSTATUS status;
enum ndr_err_code ndr_err;
if (!(mem_ctx = talloc_init("ctdbd_messaging_send"))) {
DEBUG(0, ("talloc failed\n"));
return NT_STATUS_NO_MEMORY;
}
ndr_err = ndr_push_struct_blob(
&blob, mem_ctx, msg,
(ndr_push_flags_fn_t)ndr_push_messaging_rec);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(0, ("ndr_push_struct_blob failed: %s\n",
ndr_errstr(ndr_err)));
status = ndr_map_error2ntstatus(ndr_err);
goto fail;
}
r.hdr.length = offsetof(struct ctdb_req_message, data) + blob.length;
r.hdr.ctdb_magic = CTDB_MAGIC;
r.hdr.ctdb_version = CTDB_VERSION;
r.hdr.generation = 1;
r.hdr.operation = CTDB_REQ_MESSAGE;
r.hdr.destnode = dst_vnn;
r.hdr.srcnode = conn->our_vnn;
r.hdr.reqid = 0;
r.srvid = dst_srvid;
r.datalen = blob.length;
DEBUG(10, ("ctdbd_messaging_send: Sending ctdb packet\n"));
ctdb_packet_dump(&r.hdr);
status = packet_send(
conn->pkt, 2,
data_blob_const(&r, offsetof(struct ctdb_req_message, data)),
blob);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("packet_send failed: %s\n", nt_errstr(status)));
goto fail;
}
status = packet_flush(conn->pkt);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
cluster_fatal("cluster dispatch daemon msg write error\n");
}
status = NT_STATUS_OK;
fail:
TALLOC_FREE(mem_ctx);
return status;
}
/*
* send/recv a generic ctdb control message
*/
static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
uint32_t vnn, uint32 opcode,
uint64_t srvid, TDB_DATA data,
TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
int *cstatus)
{
struct ctdb_req_control req;
struct ctdb_reply_control *reply = NULL;
struct ctdbd_connection *new_conn = NULL;
NTSTATUS status;
if (conn == NULL) {
status = ctdbd_init_connection(NULL, &new_conn);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("Could not init temp connection: %s\n",
nt_errstr(status)));
goto fail;
}
conn = new_conn;
}
ZERO_STRUCT(req);
req.hdr.length = offsetof(struct ctdb_req_control, data) + data.dsize;
req.hdr.ctdb_magic = CTDB_MAGIC;
req.hdr.ctdb_version = CTDB_VERSION;
req.hdr.operation = CTDB_REQ_CONTROL;
req.hdr.reqid = ++conn->reqid;
req.hdr.destnode = vnn;
req.opcode = opcode;
req.srvid = srvid;
req.datalen = data.dsize;
DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
ctdb_packet_dump(&req.hdr);
status = packet_send(
conn->pkt, 2,
data_blob_const(&req, offsetof(struct ctdb_req_control, data)),
data_blob_const(data.dptr, data.dsize));
if (!NT_STATUS_IS_OK(status)) {
DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
goto fail;
}
status = packet_flush(conn->pkt);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
cluster_fatal("cluster dispatch daemon control write error\n");
}
status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
goto fail;
}
if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
DEBUG(0, ("received invalid reply\n"));
goto fail;
}
if (outdata) {
if (!(outdata->dptr = (uint8 *)talloc_memdup(
mem_ctx, reply->data, reply->datalen))) {
TALLOC_FREE(reply);
return NT_STATUS_NO_MEMORY;
}
outdata->dsize = reply->datalen;
}
if (cstatus) {
(*cstatus) = reply->status;
}
status = NT_STATUS_OK;
fail:
TALLOC_FREE(new_conn);
TALLOC_FREE(reply);
return status;
}
/*
* see if a remote process exists
*/
bool ctdbd_process_exists(struct ctdbd_connection *conn, uint32 vnn, pid_t pid)
{
NTSTATUS status;
TDB_DATA data;
int32_t cstatus;
data.dptr = (uint8_t*)&pid;
data.dsize = sizeof(pid);
status = ctdbd_control(conn, vnn, CTDB_CONTROL_PROCESS_EXISTS, 0,
data, NULL, NULL, &cstatus);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, (__location__ " ctdb_control for process_exists "
"failed\n"));
return False;
}
return cstatus == 0;
}
/*
* Get a db path
*/
char *ctdbd_dbpath(struct ctdbd_connection *conn,
TALLOC_CTX *mem_ctx, uint32_t db_id)
{
NTSTATUS status;
TDB_DATA data;
int32_t cstatus;
data.dptr = (uint8_t*)&db_id;
data.dsize = sizeof(db_id);
status = ctdbd_control(conn, CTDB_CURRENT_NODE,
CTDB_CONTROL_GETDBPATH, 0, data,
mem_ctx, &data, &cstatus);
if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
DEBUG(0,(__location__ " ctdb_control for getdbpath failed\n"));
return NULL;
}
return (char *)data.dptr;
}
/*
* attach to a ctdb database
*/
NTSTATUS ctdbd_db_attach(struct ctdbd_connection *conn,
const char *name, uint32_t *db_id, int tdb_flags)
{
NTSTATUS status;
TDB_DATA data;
int32_t cstatus;
data.dptr = (uint8_t*)name;
data.dsize = strlen(name)+1;
status = ctdbd_control(conn, CTDB_CURRENT_NODE,
CTDB_CONTROL_DB_ATTACH, 0, data,
NULL, &data, &cstatus);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, (__location__ " ctdb_control for db_attach "
"failed: %s\n", nt_errstr(status)));
return status;
}
if (cstatus != 0 || data.dsize != sizeof(uint32_t)) {
DEBUG(0,(__location__ " ctdb_control for db_attach failed\n"));
return NT_STATUS_INTERNAL_ERROR;
}
*db_id = *(uint32_t *)data.dptr;
talloc_free(data.dptr);
if (!(tdb_flags & TDB_SEQNUM)) {
return NT_STATUS_OK;
}
data.dptr = (uint8_t *)db_id;
data.dsize = sizeof(*db_id);
status = ctdbd_control(conn, CTDB_CURRENT_NODE,
CTDB_CONTROL_ENABLE_SEQNUM, 0, data,
NULL, NULL, &cstatus);
if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
DEBUG(0,(__location__ " ctdb_control for enable seqnum "
"failed\n"));
return NT_STATUS_IS_OK(status) ? NT_STATUS_INTERNAL_ERROR :
status;
}
return NT_STATUS_OK;
}
/*
* force the migration of a record to this node
*/
NTSTATUS ctdbd_migrate(struct ctdbd_connection *conn, uint32 db_id,
TDB_DATA key)
{
struct ctdb_req_call req;
struct ctdb_reply_call *reply;
NTSTATUS status;
ZERO_STRUCT(req);
req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
req.hdr.ctdb_magic = CTDB_MAGIC;
req.hdr.ctdb_version = CTDB_VERSION;
req.hdr.operation = CTDB_REQ_CALL;
req.hdr.reqid = ++conn->reqid;
req.flags = CTDB_IMMEDIATE_MIGRATION;
req.callid = CTDB_NULL_FUNC;
req.db_id = db_id;
req.keylen = key.dsize;
DEBUG(10, ("ctdbd_migrate: Sending ctdb packet\n"));
ctdb_packet_dump(&req.hdr);
status = packet_send(
conn->pkt, 2,
data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
data_blob_const(key.dptr, key.dsize));
if (!NT_STATUS_IS_OK(status)) {
DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
return status;
}
status = packet_flush(conn->pkt);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
cluster_fatal("cluster dispatch daemon control write error\n");
}
status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
goto fail;
}
if (reply->hdr.operation != CTDB_REPLY_CALL) {
DEBUG(0, ("received invalid reply\n"));
status = NT_STATUS_INTERNAL_ERROR;
goto fail;
}
status = NT_STATUS_OK;
fail:
TALLOC_FREE(reply);
return status;
}
/*
* remotely fetch a record without locking it or forcing a migration
*/
NTSTATUS ctdbd_fetch(struct ctdbd_connection *conn, uint32 db_id,
TDB_DATA key, TALLOC_CTX *mem_ctx, TDB_DATA *data)
{
struct ctdb_req_call req;
struct ctdb_reply_call *reply;
NTSTATUS status;
ZERO_STRUCT(req);
req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
req.hdr.ctdb_magic = CTDB_MAGIC;
req.hdr.ctdb_version = CTDB_VERSION;
req.hdr.operation = CTDB_REQ_CALL;
req.hdr.reqid = ++conn->reqid;
req.flags = 0;
req.callid = CTDB_FETCH_FUNC;
req.db_id = db_id;
req.keylen = key.dsize;
status = packet_send(
conn->pkt, 2,
data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
data_blob_const(key.dptr, key.dsize));
if (!NT_STATUS_IS_OK(status)) {
DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
return status;
}
status = packet_flush(conn->pkt);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
cluster_fatal("cluster dispatch daemon control write error\n");
}
status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
goto fail;
}
if (reply->hdr.operation != CTDB_REPLY_CALL) {
DEBUG(0, ("received invalid reply\n"));
status = NT_STATUS_INTERNAL_ERROR;
goto fail;
}
data->dsize = reply->datalen;
if (data->dsize == 0) {
data->dptr = NULL;
goto done;
}
data->dptr = (uint8 *)talloc_memdup(mem_ctx, &reply->data[0],
reply->datalen);
if (data->dptr == NULL) {
DEBUG(0, ("talloc failed\n"));
status = NT_STATUS_NO_MEMORY;
goto fail;
}
done:
status = NT_STATUS_OK;
fail:
TALLOC_FREE(reply);
return status;
}
struct ctdbd_traverse_state {
void (*fn)(TDB_DATA key, TDB_DATA data, void *private_data);
void *private_data;
};
/*
* Handle a traverse record coming in on the ctdbd connection
*/
static NTSTATUS ctdb_traverse_handler(const struct data_blob *blob,
void *private_data)
{
struct ctdbd_traverse_state *state =
(struct ctdbd_traverse_state *)private_data;
struct ctdb_req_message *m;
struct ctdb_rec_data *d;
TDB_DATA key, data;
m = (struct ctdb_req_message *)blob->data;
if (blob->length < sizeof(*m) || m->hdr.length != blob->length) {
DEBUG(0, ("Got invalid message of length %d\n",
(int)blob->length));
return NT_STATUS_UNEXPECTED_IO_ERROR;
}
d = (struct ctdb_rec_data *)&m->data[0];
if (m->datalen < sizeof(uint32_t) || m->datalen != d->length) {
DEBUG(0, ("Got invalid traverse data of length %d\n",
(int)m->datalen));
return NT_STATUS_UNEXPECTED_IO_ERROR;
}
key.dsize = d->keylen;
key.dptr = &d->data[0];
data.dsize = d->datalen;
data.dptr = &d->data[d->keylen];
if (key.dsize == 0 && data.dsize == 0) {
/* end of traverse */
return NT_STATUS_END_OF_FILE;
}
if (data.dsize < sizeof(struct ctdb_ltdb_header)) {
DEBUG(0, ("Got invalid ltdb header length %d\n",
(int)data.dsize));
return NT_STATUS_UNEXPECTED_IO_ERROR;
}
data.dsize -= sizeof(struct ctdb_ltdb_header);
data.dptr += sizeof(struct ctdb_ltdb_header);
if (state->fn) {
state->fn(key, data, state->private_data);
}
return NT_STATUS_OK;
}
/*
Traverse a ctdb database. This uses a kind-of hackish way to open a second
connection to ctdbd to avoid the hairy recursive and async problems with
everything in-line.
*/
NTSTATUS ctdbd_traverse(uint32 db_id,
void (*fn)(TDB_DATA key, TDB_DATA data,
void *private_data),
void *private_data)
{
struct ctdbd_connection *conn;
NTSTATUS status;
TDB_DATA data;
struct ctdb_traverse_start t;
int cstatus;
struct ctdbd_traverse_state state;
status = ctdbd_init_connection(NULL, &conn);
t.db_id = db_id;
t.srvid = conn->rand_srvid;
t.reqid = ++conn->reqid;
data.dptr = (uint8_t *)&t;
data.dsize = sizeof(t);
status = ctdbd_control(conn, CTDB_CURRENT_NODE,
CTDB_CONTROL_TRAVERSE_START, conn->rand_srvid,
data, NULL, NULL, &cstatus);
if (!NT_STATUS_IS_OK(status) || (cstatus != 0)) {
DEBUG(0,("ctdbd_control failed: %s, %d\n", nt_errstr(status),
cstatus));
if (NT_STATUS_IS_OK(status)) {
/*
* We need a mapping here
*/
status = NT_STATUS_UNSUCCESSFUL;
}
goto done;
}
state.fn = fn;
state.private_data = private_data;
while (True) {
status = NT_STATUS_OK;
if (packet_handler(conn->pkt, ctdb_req_complete,
ctdb_traverse_handler, &state, &status)) {
if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
status = NT_STATUS_OK;
break;
}
/*
* There might be more in the queue
*/
continue;
}
if (!NT_STATUS_IS_OK(status)) {
break;
}
status = packet_fd_read_sync(conn->pkt);
if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
/*
* There might be more in the queue
*/
continue;
}
if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
status = NT_STATUS_OK;
}
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("packet_fd_read_sync failed: %s\n", nt_errstr(status)));
cluster_fatal("ctdbd died\n");
}
}
done:
TALLOC_FREE(conn);
return status;
}
/*
* Register us as a server for a particular tcp connection
*/
NTSTATUS ctdbd_register_ips(struct ctdbd_connection *conn,
const struct sockaddr_in *server,
const struct sockaddr_in *client,
void (*release_ip_handler)(const char *ip_addr,
void *private_data),
void *private_data)
{
struct ctdb_control_tcp p;
TDB_DATA data;
NTSTATUS status;
/*
* Only one connection so far
*/
SMB_ASSERT(conn->release_ip_handler == NULL);
/*
* We want to be told about IP releases
*/
status = register_with_ctdbd(conn, CTDB_SRVID_RELEASE_IP);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
p.dest = *server;
p.src = *client;
/*
* inform ctdb of our tcp connection, so if IP takeover happens ctdb
* can send an extra ack to trigger a reset for our client, so it
* immediately reconnects
*/
data.dptr = (uint8_t *)&p;
data.dsize = sizeof(p);
return ctdbd_control(conn, CTDB_CURRENT_NODE,
CTDB_CONTROL_TCP_CLIENT,
CTDB_CTRL_FLAG_NOREPLY, data, NULL, NULL, NULL);
}
/*
* We want to handle reconfigure events
*/
NTSTATUS ctdbd_register_reconfigure(struct ctdbd_connection *conn)
{
return register_with_ctdbd(conn, CTDB_SRVID_RECONFIGURE);
}
#else
NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
struct ctdbd_connection **pconn)
{
return NT_STATUS_NOT_IMPLEMENTED;
}
#endif
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