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samba-mirror/source4/lib/messaging/messaging.c

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/*
Unix SMB/CIFS implementation.
Samba internal messaging functions
Copyright (C) Andrew Tridgell 2004
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"
#include "lib/events/events.h"
#include "system/filesys.h"
#include "messaging/messaging.h"
#include "../lib/util/dlinklist.h"
#include "lib/socket/socket.h"
#include "librpc/gen_ndr/ndr_irpc.h"
#include "lib/messaging/irpc.h"
#include "lib/util/tdb_wrap.h"
#include "../lib/util/unix_privs.h"
#include "librpc/rpc/dcerpc.h"
#include "../lib/tdb_compat/tdb_compat.h"
#include "../lib/util/util_tdb.h"
#include "cluster/cluster.h"
#include "../lib/util/tevent_ntstatus.h"
/* change the message version with any incompatible changes in the protocol */
#define IMESSAGING_VERSION 1
/*
a pending irpc call
*/
struct irpc_request {
struct imessaging_context *msg_ctx;
int callid;
struct {
void (*handler)(struct irpc_request *irpc, struct irpc_message *m);
void *private_data;
} incoming;
};
struct imessaging_context {
struct server_id server_id;
struct socket_context *sock;
const char *base_path;
const char *path;
struct dispatch_fn **dispatch;
uint32_t num_types;
struct idr_context *dispatch_tree;
struct imessaging_rec *pending;
struct imessaging_rec *retry_queue;
struct irpc_list *irpc;
struct idr_context *idr;
const char **names;
struct timeval start_time;
struct tevent_timer *retry_te;
struct {
struct tevent_context *ev;
struct tevent_fd *fde;
} event;
};
/* we have a linked list of dispatch handlers for each msg_type that
this messaging server can deal with */
struct dispatch_fn {
struct dispatch_fn *next, *prev;
uint32_t msg_type;
void *private_data;
msg_callback_t fn;
};
/* an individual message */
struct imessaging_rec {
struct imessaging_rec *next, *prev;
struct imessaging_context *msg;
const char *path;
struct imessaging_header {
uint32_t version;
uint32_t msg_type;
struct server_id from;
struct server_id to;
uint32_t length;
} *header;
DATA_BLOB packet;
uint32_t retries;
};
static void irpc_handler(struct imessaging_context *, void *,
uint32_t, struct server_id, DATA_BLOB *);
/*
A useful function for testing the message system.
*/
static void ping_message(struct imessaging_context *msg, void *private_data,
uint32_t msg_type, struct server_id src, DATA_BLOB *data)
{
char *task_id = server_id_str(NULL, &src);
DEBUG(1,("INFO: Received PING message from server %s [%.*s]\n",
task_id, (int)data->length,
data->data?(const char *)data->data:""));
talloc_free(task_id);
imessaging_send(msg, src, MSG_PONG, data);
}
/*
return uptime of messaging server via irpc
*/
static NTSTATUS irpc_uptime(struct irpc_message *msg,
struct irpc_uptime *r)
{
struct imessaging_context *ctx = talloc_get_type(msg->private_data, struct imessaging_context);
*r->out.start_time = timeval_to_nttime(&ctx->start_time);
return NT_STATUS_OK;
}
/*
return the path to a messaging socket
*/
static char *imessaging_path(struct imessaging_context *msg, struct server_id server_id)
{
TALLOC_CTX *tmp_ctx = talloc_new(msg);
const char *id = server_id_str(tmp_ctx, &server_id);
char *s;
if (id == NULL) {
return NULL;
}
s = talloc_asprintf(msg, "%s/msg.%s", msg->base_path, id);
talloc_steal(s, tmp_ctx);
return s;
}
/*
dispatch a fully received message
note that this deliberately can match more than one message handler
per message. That allows a single messasging context to register
(for example) a debug handler for more than one piece of code
*/
static void imessaging_dispatch(struct imessaging_context *msg, struct imessaging_rec *rec)
{
struct dispatch_fn *d, *next;
/* temporary IDs use an idtree, the rest use a array of pointers */
if (rec->header->msg_type >= MSG_TMP_BASE) {
d = (struct dispatch_fn *)idr_find(msg->dispatch_tree,
rec->header->msg_type);
} else if (rec->header->msg_type < msg->num_types) {
d = msg->dispatch[rec->header->msg_type];
} else {
d = NULL;
}
for (; d; d = next) {
DATA_BLOB data;
next = d->next;
data.data = rec->packet.data + sizeof(*rec->header);
data.length = rec->header->length;
d->fn(msg, d->private_data, d->msg_type, rec->header->from, &data);
}
rec->header->length = 0;
}
/*
handler for messages that arrive from other nodes in the cluster
*/
static void cluster_message_handler(struct imessaging_context *msg, DATA_BLOB packet)
{
struct imessaging_rec *rec;
rec = talloc(msg, struct imessaging_rec);
if (rec == NULL) {
smb_panic("Unable to allocate imessaging_rec");
}
rec->msg = msg;
rec->path = msg->path;
rec->header = (struct imessaging_header *)packet.data;
rec->packet = packet;
rec->retries = 0;
if (packet.length != sizeof(*rec->header) + rec->header->length) {
DEBUG(0,("messaging: bad message header size %d should be %d\n",
rec->header->length, (int)(packet.length - sizeof(*rec->header))));
talloc_free(rec);
return;
}
imessaging_dispatch(msg, rec);
talloc_free(rec);
}
/*
try to send the message
*/
static NTSTATUS try_send(struct imessaging_rec *rec)
{
struct imessaging_context *msg = rec->msg;
size_t nsent;
void *priv;
NTSTATUS status;
struct socket_address *path;
/* rec->path is the path of the *other* socket, where we want
* this to end up */
path = socket_address_from_strings(msg, msg->sock->backend_name,
rec->path, 0);
if (!path) {
return NT_STATUS_NO_MEMORY;
}
/* we send with privileges so messages work from any context */
priv = root_privileges();
status = socket_sendto(msg->sock, &rec->packet, &nsent, path);
talloc_free(path);
talloc_free(priv);
return status;
}
/*
retry backed off messages
*/
static void msg_retry_timer(struct tevent_context *ev, struct tevent_timer *te,
struct timeval t, void *private_data)
{
struct imessaging_context *msg = talloc_get_type(private_data,
struct imessaging_context);
msg->retry_te = NULL;
/* put the messages back on the main queue */
while (msg->retry_queue) {
struct imessaging_rec *rec = msg->retry_queue;
DLIST_REMOVE(msg->retry_queue, rec);
DLIST_ADD_END(msg->pending, rec, struct imessaging_rec *);
}
EVENT_FD_WRITEABLE(msg->event.fde);
}
/*
handle a socket write event
*/
static void imessaging_send_handler(struct imessaging_context *msg)
{
while (msg->pending) {
struct imessaging_rec *rec = msg->pending;
NTSTATUS status;
status = try_send(rec);
if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
rec->retries++;
if (rec->retries > 3) {
/* we're getting continuous write errors -
backoff this record */
DLIST_REMOVE(msg->pending, rec);
DLIST_ADD_END(msg->retry_queue, rec,
struct imessaging_rec *);
if (msg->retry_te == NULL) {
msg->retry_te =
event_add_timed(msg->event.ev, msg,
timeval_current_ofs(1, 0),
msg_retry_timer, msg);
}
}
break;
}
rec->retries = 0;
if (!NT_STATUS_IS_OK(status)) {
TALLOC_CTX *tmp_ctx = talloc_new(msg);
DEBUG(1,("messaging: Lost message from %s to %s of type %u - %s\n",
server_id_str(tmp_ctx, &rec->header->from),
server_id_str(tmp_ctx, &rec->header->to),
rec->header->msg_type,
nt_errstr(status)));
talloc_free(tmp_ctx);
}
DLIST_REMOVE(msg->pending, rec);
talloc_free(rec);
}
if (msg->pending == NULL) {
EVENT_FD_NOT_WRITEABLE(msg->event.fde);
}
}
/*
handle a new incoming packet
*/
static void imessaging_recv_handler(struct imessaging_context *msg)
{
struct imessaging_rec *rec;
NTSTATUS status;
DATA_BLOB packet;
size_t msize;
/* see how many bytes are in the next packet */
status = socket_pending(msg->sock, &msize);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("socket_pending failed in messaging - %s\n",
nt_errstr(status)));
return;
}
packet = data_blob_talloc(msg, NULL, msize);
if (packet.data == NULL) {
/* assume this is temporary and retry */
return;
}
status = socket_recv(msg->sock, packet.data, msize, &msize);
if (!NT_STATUS_IS_OK(status)) {
data_blob_free(&packet);
return;
}
if (msize < sizeof(*rec->header)) {
DEBUG(0,("messaging: bad message of size %d\n", (int)msize));
data_blob_free(&packet);
return;
}
rec = talloc(msg, struct imessaging_rec);
if (rec == NULL) {
smb_panic("Unable to allocate imessaging_rec");
}
talloc_steal(rec, packet.data);
rec->msg = msg;
rec->path = msg->path;
rec->header = (struct imessaging_header *)packet.data;
rec->packet = packet;
rec->retries = 0;
if (msize != sizeof(*rec->header) + rec->header->length) {
DEBUG(0,("messaging: bad message header size %d should be %d\n",
rec->header->length, (int)(msize - sizeof(*rec->header))));
talloc_free(rec);
return;
}
imessaging_dispatch(msg, rec);
talloc_free(rec);
}
/*
handle a socket event
*/
static void imessaging_handler(struct tevent_context *ev, struct tevent_fd *fde,
uint16_t flags, void *private_data)
{
struct imessaging_context *msg = talloc_get_type(private_data,
struct imessaging_context);
if (flags & EVENT_FD_WRITE) {
imessaging_send_handler(msg);
}
if (flags & EVENT_FD_READ) {
imessaging_recv_handler(msg);
}
}
/*
Register a dispatch function for a particular message type.
*/
NTSTATUS imessaging_register(struct imessaging_context *msg, void *private_data,
uint32_t msg_type, msg_callback_t fn)
{
struct dispatch_fn *d;
/* possibly expand dispatch array */
if (msg_type >= msg->num_types) {
struct dispatch_fn **dp;
int i;
dp = talloc_realloc(msg, msg->dispatch, struct dispatch_fn *, msg_type+1);
NT_STATUS_HAVE_NO_MEMORY(dp);
msg->dispatch = dp;
for (i=msg->num_types;i<=msg_type;i++) {
msg->dispatch[i] = NULL;
}
msg->num_types = msg_type+1;
}
d = talloc_zero(msg->dispatch, struct dispatch_fn);
NT_STATUS_HAVE_NO_MEMORY(d);
d->msg_type = msg_type;
d->private_data = private_data;
d->fn = fn;
DLIST_ADD(msg->dispatch[msg_type], d);
return NT_STATUS_OK;
}
/*
register a temporary message handler. The msg_type is allocated
above MSG_TMP_BASE
*/
NTSTATUS imessaging_register_tmp(struct imessaging_context *msg, void *private_data,
msg_callback_t fn, uint32_t *msg_type)
{
struct dispatch_fn *d;
int id;
d = talloc_zero(msg->dispatch, struct dispatch_fn);
NT_STATUS_HAVE_NO_MEMORY(d);
d->private_data = private_data;
d->fn = fn;
id = idr_get_new_above(msg->dispatch_tree, d, MSG_TMP_BASE, UINT16_MAX);
if (id == -1) {
talloc_free(d);
return NT_STATUS_TOO_MANY_CONTEXT_IDS;
}
d->msg_type = (uint32_t)id;
(*msg_type) = d->msg_type;
return NT_STATUS_OK;
}
/*
De-register the function for a particular message type.
*/
void imessaging_deregister(struct imessaging_context *msg, uint32_t msg_type, void *private_data)
{
struct dispatch_fn *d, *next;
if (msg_type >= msg->num_types) {
d = (struct dispatch_fn *)idr_find(msg->dispatch_tree,
msg_type);
if (!d) return;
idr_remove(msg->dispatch_tree, msg_type);
talloc_free(d);
return;
}
for (d = msg->dispatch[msg_type]; d; d = next) {
next = d->next;
if (d->private_data == private_data) {
DLIST_REMOVE(msg->dispatch[msg_type], d);
talloc_free(d);
}
}
}
/*
Send a message to a particular server
*/
NTSTATUS imessaging_send(struct imessaging_context *msg, struct server_id server,
uint32_t msg_type, const DATA_BLOB *data)
{
struct imessaging_rec *rec;
NTSTATUS status;
size_t dlength = data?data->length:0;
rec = talloc(msg, struct imessaging_rec);
if (rec == NULL) {
return NT_STATUS_NO_MEMORY;
}
rec->packet = data_blob_talloc(rec, NULL, sizeof(*rec->header) + dlength);
if (rec->packet.data == NULL) {
talloc_free(rec);
return NT_STATUS_NO_MEMORY;
}
rec->retries = 0;
rec->msg = msg;
rec->header = (struct imessaging_header *)rec->packet.data;
/* zero padding */
ZERO_STRUCTP(rec->header);
rec->header->version = IMESSAGING_VERSION;
rec->header->msg_type = msg_type;
rec->header->from = msg->server_id;
rec->header->to = server;
rec->header->length = dlength;
if (dlength != 0) {
memcpy(rec->packet.data + sizeof(*rec->header),
data->data, dlength);
}
if (!cluster_node_equal(&msg->server_id, &server)) {
/* the destination is on another node - dispatch via
the cluster layer */
status = cluster_message_send(server, &rec->packet);
talloc_free(rec);
return status;
}
rec->path = imessaging_path(msg, server);
talloc_steal(rec, rec->path);
if (msg->pending != NULL) {
status = STATUS_MORE_ENTRIES;
} else {
status = try_send(rec);
}
if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
if (msg->pending == NULL) {
EVENT_FD_WRITEABLE(msg->event.fde);
}
DLIST_ADD_END(msg->pending, rec, struct imessaging_rec *);
return NT_STATUS_OK;
}
talloc_free(rec);
return status;
}
/*
Send a message to a particular server, with the message containing a single pointer
*/
NTSTATUS imessaging_send_ptr(struct imessaging_context *msg, struct server_id server,
uint32_t msg_type, void *ptr)
{
DATA_BLOB blob;
blob.data = (uint8_t *)&ptr;
blob.length = sizeof(void *);
return imessaging_send(msg, server, msg_type, &blob);
}
/*
destroy the messaging context
*/
static int imessaging_destructor(struct imessaging_context *msg)
{
unlink(msg->path);
while (msg->names && msg->names[0]) {
irpc_remove_name(msg, msg->names[0]);
}
return 0;
}
/*
create the listening socket and setup the dispatcher
*/
struct imessaging_context *imessaging_init(TALLOC_CTX *mem_ctx,
const char *dir,
struct server_id server_id,
struct tevent_context *ev)
{
struct imessaging_context *msg;
NTSTATUS status;
struct socket_address *path;
if (ev == NULL) {
return NULL;
}
msg = talloc_zero(mem_ctx, struct imessaging_context);
if (msg == NULL) {
return NULL;
}
/* setup a handler for messages from other cluster nodes, if appropriate */
status = cluster_message_init(msg, server_id, cluster_message_handler);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(msg);
return NULL;
}
/* create the messaging directory if needed */
mkdir(dir, 0700);
msg->base_path = talloc_reference(msg, dir);
msg->path = imessaging_path(msg, server_id);
msg->server_id = server_id;
msg->idr = idr_init(msg);
msg->dispatch_tree = idr_init(msg);
msg->start_time = timeval_current();
status = socket_create("unix", SOCKET_TYPE_DGRAM, &msg->sock, 0);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(msg);
return NULL;
}
/* by stealing here we ensure that the socket is cleaned up (and even
deleted) on exit */
talloc_steal(msg, msg->sock);
path = socket_address_from_strings(msg, msg->sock->backend_name,
msg->path, 0);
if (!path) {
talloc_free(msg);
return NULL;
}
status = socket_listen(msg->sock, path, 50, 0);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Unable to setup messaging listener for '%s':%s\n", msg->path, nt_errstr(status)));
talloc_free(msg);
return NULL;
}
/* it needs to be non blocking for sends */
set_blocking(socket_get_fd(msg->sock), false);
msg->event.ev = ev;
msg->event.fde = event_add_fd(ev, msg, socket_get_fd(msg->sock),
EVENT_FD_READ, imessaging_handler, msg);
tevent_fd_set_auto_close(msg->event.fde);
talloc_set_destructor(msg, imessaging_destructor);
imessaging_register(msg, NULL, MSG_PING, ping_message);
imessaging_register(msg, NULL, MSG_IRPC, irpc_handler);
IRPC_REGISTER(msg, irpc, IRPC_UPTIME, irpc_uptime, msg);
return msg;
}
/*
A hack, for the short term until we get 'client only' messaging in place
*/
struct imessaging_context *imessaging_client_init(TALLOC_CTX *mem_ctx,
const char *dir,
struct tevent_context *ev)
{
struct server_id id;
ZERO_STRUCT(id);
id.pid = random() % 0x10000000;
return imessaging_init(mem_ctx, dir, id, ev);
}
/*
a list of registered irpc server functions
*/
struct irpc_list {
struct irpc_list *next, *prev;
struct GUID uuid;
const struct ndr_interface_table *table;
int callnum;
irpc_function_t fn;
void *private_data;
};
/*
register a irpc server function
*/
NTSTATUS irpc_register(struct imessaging_context *msg_ctx,
const struct ndr_interface_table *table,
int callnum, irpc_function_t fn, void *private_data)
{
struct irpc_list *irpc;
/* override an existing handler, if any */
for (irpc=msg_ctx->irpc; irpc; irpc=irpc->next) {
if (irpc->table == table && irpc->callnum == callnum) {
break;
}
}
if (irpc == NULL) {
irpc = talloc(msg_ctx, struct irpc_list);
NT_STATUS_HAVE_NO_MEMORY(irpc);
DLIST_ADD(msg_ctx->irpc, irpc);
}
irpc->table = table;
irpc->callnum = callnum;
irpc->fn = fn;
irpc->private_data = private_data;
irpc->uuid = irpc->table->syntax_id.uuid;
return NT_STATUS_OK;
}
/*
handle an incoming irpc reply message
*/
static void irpc_handler_reply(struct imessaging_context *msg_ctx, struct irpc_message *m)
{
struct irpc_request *irpc;
irpc = (struct irpc_request *)idr_find(msg_ctx->idr, m->header.callid);
if (irpc == NULL) return;
irpc->incoming.handler(irpc, m);
}
/*
send a irpc reply
*/
NTSTATUS irpc_send_reply(struct irpc_message *m, NTSTATUS status)
{
struct ndr_push *push;
DATA_BLOB packet;
enum ndr_err_code ndr_err;
m->header.status = status;
/* setup the reply */
push = ndr_push_init_ctx(m->ndr);
if (push == NULL) {
status = NT_STATUS_NO_MEMORY;
goto failed;
}
m->header.flags |= IRPC_FLAG_REPLY;
m->header.creds.token= NULL;
/* construct the packet */
ndr_err = ndr_push_irpc_header(push, NDR_SCALARS|NDR_BUFFERS, &m->header);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
goto failed;
}
ndr_err = m->irpc->table->calls[m->irpc->callnum].ndr_push(push, NDR_OUT, m->data);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
goto failed;
}
/* send the reply message */
packet = ndr_push_blob(push);
status = imessaging_send(m->msg_ctx, m->from, MSG_IRPC, &packet);
if (!NT_STATUS_IS_OK(status)) goto failed;
failed:
talloc_free(m);
return status;
}
/*
handle an incoming irpc request message
*/
static void irpc_handler_request(struct imessaging_context *msg_ctx,
struct irpc_message *m)
{
struct irpc_list *i;
void *r;
enum ndr_err_code ndr_err;
for (i=msg_ctx->irpc; i; i=i->next) {
if (GUID_equal(&i->uuid, &m->header.uuid) &&
i->table->syntax_id.if_version == m->header.if_version &&
i->callnum == m->header.callnum) {
break;
}
}
if (i == NULL) {
/* no registered handler for this message */
talloc_free(m);
return;
}
/* allocate space for the structure */
r = talloc_zero_size(m->ndr, i->table->calls[m->header.callnum].struct_size);
if (r == NULL) goto failed;
m->ndr->flags |= LIBNDR_FLAG_REF_ALLOC;
/* parse the request data */
ndr_err = i->table->calls[i->callnum].ndr_pull(m->ndr, NDR_IN, r);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) goto failed;
/* make the call */
m->private_data= i->private_data;
m->defer_reply = false;
m->no_reply = false;
m->msg_ctx = msg_ctx;
m->irpc = i;
m->data = r;
m->ev = msg_ctx->event.ev;
m->header.status = i->fn(m, r);
if (m->no_reply) {
/* the server function won't ever be replying to this request */
talloc_free(m);
return;
}
if (m->defer_reply) {
/* the server function has asked to defer the reply to later */
talloc_steal(msg_ctx, m);
return;
}
irpc_send_reply(m, m->header.status);
return;
failed:
talloc_free(m);
}
/*
handle an incoming irpc message
*/
static void irpc_handler(struct imessaging_context *msg_ctx, void *private_data,
uint32_t msg_type, struct server_id src, DATA_BLOB *packet)
{
struct irpc_message *m;
enum ndr_err_code ndr_err;
m = talloc(msg_ctx, struct irpc_message);
if (m == NULL) goto failed;
m->from = src;
m->ndr = ndr_pull_init_blob(packet, m);
if (m->ndr == NULL) goto failed;
m->ndr->flags |= LIBNDR_FLAG_REF_ALLOC;
ndr_err = ndr_pull_irpc_header(m->ndr, NDR_BUFFERS|NDR_SCALARS, &m->header);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) goto failed;
if (m->header.flags & IRPC_FLAG_REPLY) {
irpc_handler_reply(msg_ctx, m);
} else {
irpc_handler_request(msg_ctx, m);
}
return;
failed:
talloc_free(m);
}
/*
destroy a irpc request
*/
static int irpc_destructor(struct irpc_request *irpc)
{
if (irpc->callid != -1) {
idr_remove(irpc->msg_ctx->idr, irpc->callid);
irpc->callid = -1;
}
return 0;
}
/*
open the naming database
*/
static struct tdb_wrap *irpc_namedb_open(struct imessaging_context *msg_ctx)
{
struct tdb_wrap *t;
char *path = talloc_asprintf(msg_ctx, "%s/names.tdb", msg_ctx->base_path);
if (path == NULL) {
return NULL;
}
t = tdb_wrap_open(msg_ctx, path, 0, 0, O_RDWR|O_CREAT, 0660);
talloc_free(path);
return t;
}
/*
add a string name that this irpc server can be called on
*/
NTSTATUS irpc_add_name(struct imessaging_context *msg_ctx, const char *name)
{
struct tdb_wrap *t;
TDB_DATA rec;
int count;
NTSTATUS status = NT_STATUS_OK;
t = irpc_namedb_open(msg_ctx);
NT_STATUS_HAVE_NO_MEMORY(t);
if (tdb_lock_bystring(t->tdb, name) != 0) {
talloc_free(t);
return NT_STATUS_LOCK_NOT_GRANTED;
}
rec = tdb_fetch_bystring(t->tdb, name);
count = rec.dsize / sizeof(struct server_id);
rec.dptr = (unsigned char *)realloc_p(rec.dptr, struct server_id, count+1);
rec.dsize += sizeof(struct server_id);
if (rec.dptr == NULL) {
tdb_unlock_bystring(t->tdb, name);
talloc_free(t);
return NT_STATUS_NO_MEMORY;
}
((struct server_id *)rec.dptr)[count] = msg_ctx->server_id;
if (tdb_store_bystring(t->tdb, name, rec, 0) != 0) {
status = NT_STATUS_INTERNAL_ERROR;
}
free(rec.dptr);
tdb_unlock_bystring(t->tdb, name);
talloc_free(t);
msg_ctx->names = str_list_add(msg_ctx->names, name);
talloc_steal(msg_ctx, msg_ctx->names);
return status;
}
/*
return a list of server ids for a server name
*/
struct server_id *irpc_servers_byname(struct imessaging_context *msg_ctx,
TALLOC_CTX *mem_ctx,
const char *name)
{
struct tdb_wrap *t;
TDB_DATA rec;
int count, i;
struct server_id *ret;
t = irpc_namedb_open(msg_ctx);
if (t == NULL) {
return NULL;
}
if (tdb_lock_bystring(t->tdb, name) != 0) {
talloc_free(t);
return NULL;
}
rec = tdb_fetch_bystring(t->tdb, name);
if (rec.dptr == NULL) {
tdb_unlock_bystring(t->tdb, name);
talloc_free(t);
return NULL;
}
count = rec.dsize / sizeof(struct server_id);
ret = talloc_array(mem_ctx, struct server_id, count+1);
if (ret == NULL) {
tdb_unlock_bystring(t->tdb, name);
talloc_free(t);
return NULL;
}
for (i=0;i<count;i++) {
ret[i] = ((struct server_id *)rec.dptr)[i];
}
ret[i] = cluster_id(0, 0);
free(rec.dptr);
tdb_unlock_bystring(t->tdb, name);
talloc_free(t);
return ret;
}
/*
remove a name from a messaging context
*/
void irpc_remove_name(struct imessaging_context *msg_ctx, const char *name)
{
struct tdb_wrap *t;
TDB_DATA rec;
int count, i;
struct server_id *ids;
str_list_remove(msg_ctx->names, name);
t = irpc_namedb_open(msg_ctx);
if (t == NULL) {
return;
}
if (tdb_lock_bystring(t->tdb, name) != 0) {
talloc_free(t);
return;
}
rec = tdb_fetch_bystring(t->tdb, name);
if (rec.dptr == NULL) {
tdb_unlock_bystring(t->tdb, name);
talloc_free(t);
return;
}
count = rec.dsize / sizeof(struct server_id);
if (count == 0) {
free(rec.dptr);
tdb_unlock_bystring(t->tdb, name);
talloc_free(t);
return;
}
ids = (struct server_id *)rec.dptr;
for (i=0;i<count;i++) {
if (cluster_id_equal(&ids[i], &msg_ctx->server_id)) {
if (i < count-1) {
memmove(ids+i, ids+i+1,
sizeof(struct server_id) * (count-(i+1)));
}
rec.dsize -= sizeof(struct server_id);
break;
}
}
tdb_store_bystring(t->tdb, name, rec, 0);
free(rec.dptr);
tdb_unlock_bystring(t->tdb, name);
talloc_free(t);
}
struct server_id imessaging_get_server_id(struct imessaging_context *msg_ctx)
{
return msg_ctx->server_id;
}
struct irpc_bh_state {
struct imessaging_context *msg_ctx;
struct server_id server_id;
const struct ndr_interface_table *table;
uint32_t timeout;
struct security_token *token;
};
static bool irpc_bh_is_connected(struct dcerpc_binding_handle *h)
{
struct irpc_bh_state *hs = dcerpc_binding_handle_data(h,
struct irpc_bh_state);
if (!hs->msg_ctx) {
return false;
}
return true;
}
static uint32_t irpc_bh_set_timeout(struct dcerpc_binding_handle *h,
uint32_t timeout)
{
struct irpc_bh_state *hs = dcerpc_binding_handle_data(h,
struct irpc_bh_state);
uint32_t old = hs->timeout;
hs->timeout = timeout;
return old;
}
struct irpc_bh_raw_call_state {
struct irpc_request *irpc;
uint32_t opnum;
DATA_BLOB in_data;
DATA_BLOB in_packet;
DATA_BLOB out_data;
};
static void irpc_bh_raw_call_incoming_handler(struct irpc_request *irpc,
struct irpc_message *m);
static struct tevent_req *irpc_bh_raw_call_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct dcerpc_binding_handle *h,
const struct GUID *object,
uint32_t opnum,
uint32_t in_flags,
const uint8_t *in_data,
size_t in_length)
{
struct irpc_bh_state *hs =
dcerpc_binding_handle_data(h,
struct irpc_bh_state);
struct tevent_req *req;
struct irpc_bh_raw_call_state *state;
bool ok;
struct irpc_header header;
struct ndr_push *ndr;
NTSTATUS status;
enum ndr_err_code ndr_err;
req = tevent_req_create(mem_ctx, &state,
struct irpc_bh_raw_call_state);
if (req == NULL) {
return NULL;
}
state->opnum = opnum;
state->in_data.data = discard_const_p(uint8_t, in_data);
state->in_data.length = in_length;
ok = irpc_bh_is_connected(h);
if (!ok) {
tevent_req_nterror(req, NT_STATUS_INVALID_CONNECTION);
return tevent_req_post(req, ev);
}
state->irpc = talloc_zero(state, struct irpc_request);
if (tevent_req_nomem(state->irpc, req)) {
return tevent_req_post(req, ev);
}
state->irpc->msg_ctx = hs->msg_ctx;
state->irpc->callid = idr_get_new(hs->msg_ctx->idr,
state->irpc, UINT16_MAX);
if (state->irpc->callid == -1) {
tevent_req_nterror(req, NT_STATUS_INSUFFICIENT_RESOURCES);
return tevent_req_post(req, ev);
}
state->irpc->incoming.handler = irpc_bh_raw_call_incoming_handler;
state->irpc->incoming.private_data = req;
talloc_set_destructor(state->irpc, irpc_destructor);
/* setup the header */
header.uuid = hs->table->syntax_id.uuid;
header.if_version = hs->table->syntax_id.if_version;
header.callid = state->irpc->callid;
header.callnum = state->opnum;
header.flags = 0;
header.status = NT_STATUS_OK;
header.creds.token= hs->token;
/* construct the irpc packet */
ndr = ndr_push_init_ctx(state->irpc);
if (tevent_req_nomem(ndr, req)) {
return tevent_req_post(req, ev);
}
ndr_err = ndr_push_irpc_header(ndr, NDR_SCALARS|NDR_BUFFERS, &header);
status = ndr_map_error2ntstatus(ndr_err);
if (!NT_STATUS_IS_OK(status)) {
tevent_req_nterror(req, status);
return tevent_req_post(req, ev);
}
ndr_err = ndr_push_bytes(ndr, in_data, in_length);
status = ndr_map_error2ntstatus(ndr_err);
if (!NT_STATUS_IS_OK(status)) {
tevent_req_nterror(req, status);
return tevent_req_post(req, ev);
}
/* and send it */
state->in_packet = ndr_push_blob(ndr);
status = imessaging_send(hs->msg_ctx, hs->server_id,
MSG_IRPC, &state->in_packet);
if (!NT_STATUS_IS_OK(status)) {
tevent_req_nterror(req, status);
return tevent_req_post(req, ev);
}
if (hs->timeout != IRPC_CALL_TIMEOUT_INF) {
/* set timeout-callback in case caller wants that */
ok = tevent_req_set_endtime(req, ev, timeval_current_ofs(hs->timeout, 0));
if (!ok) {
return tevent_req_post(req, ev);
}
}
return req;
}
static void irpc_bh_raw_call_incoming_handler(struct irpc_request *irpc,
struct irpc_message *m)
{
struct tevent_req *req =
talloc_get_type_abort(irpc->incoming.private_data,
struct tevent_req);
struct irpc_bh_raw_call_state *state =
tevent_req_data(req,
struct irpc_bh_raw_call_state);
talloc_steal(state, m);
if (!NT_STATUS_IS_OK(m->header.status)) {
tevent_req_nterror(req, m->header.status);
return;
}
state->out_data = data_blob_talloc(state,
m->ndr->data + m->ndr->offset,
m->ndr->data_size - m->ndr->offset);
if ((m->ndr->data_size - m->ndr->offset) > 0 && !state->out_data.data) {
tevent_req_nomem(NULL, req);
return;
}
tevent_req_done(req);
}
static NTSTATUS irpc_bh_raw_call_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx,
uint8_t **out_data,
size_t *out_length,
uint32_t *out_flags)
{
struct irpc_bh_raw_call_state *state =
tevent_req_data(req,
struct irpc_bh_raw_call_state);
NTSTATUS status;
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
*out_data = talloc_move(mem_ctx, &state->out_data.data);
*out_length = state->out_data.length;
*out_flags = 0;
tevent_req_received(req);
return NT_STATUS_OK;
}
struct irpc_bh_disconnect_state {
uint8_t _dummy;
};
static struct tevent_req *irpc_bh_disconnect_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct dcerpc_binding_handle *h)
{
struct irpc_bh_state *hs = dcerpc_binding_handle_data(h,
struct irpc_bh_state);
struct tevent_req *req;
struct irpc_bh_disconnect_state *state;
bool ok;
req = tevent_req_create(mem_ctx, &state,
struct irpc_bh_disconnect_state);
if (req == NULL) {
return NULL;
}
ok = irpc_bh_is_connected(h);
if (!ok) {
tevent_req_nterror(req, NT_STATUS_INVALID_CONNECTION);
return tevent_req_post(req, ev);
}
hs->msg_ctx = NULL;
tevent_req_done(req);
return tevent_req_post(req, ev);
}
static NTSTATUS irpc_bh_disconnect_recv(struct tevent_req *req)
{
NTSTATUS status;
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
tevent_req_received(req);
return NT_STATUS_OK;
}
static bool irpc_bh_ref_alloc(struct dcerpc_binding_handle *h)
{
return true;
}
static const struct dcerpc_binding_handle_ops irpc_bh_ops = {
.name = "wbint",
.is_connected = irpc_bh_is_connected,
.set_timeout = irpc_bh_set_timeout,
.raw_call_send = irpc_bh_raw_call_send,
.raw_call_recv = irpc_bh_raw_call_recv,
.disconnect_send = irpc_bh_disconnect_send,
.disconnect_recv = irpc_bh_disconnect_recv,
.ref_alloc = irpc_bh_ref_alloc,
};
/* initialise a irpc binding handle */
struct dcerpc_binding_handle *irpc_binding_handle(TALLOC_CTX *mem_ctx,
struct imessaging_context *msg_ctx,
struct server_id server_id,
const struct ndr_interface_table *table)
{
struct dcerpc_binding_handle *h;
struct irpc_bh_state *hs;
h = dcerpc_binding_handle_create(mem_ctx,
&irpc_bh_ops,
NULL,
table,
&hs,
struct irpc_bh_state,
__location__);
if (h == NULL) {
return NULL;
}
hs->msg_ctx = msg_ctx;
hs->server_id = server_id;
hs->table = table;
hs->timeout = IRPC_CALL_TIMEOUT;
dcerpc_binding_handle_set_sync_ev(h, msg_ctx->event.ev);
return h;
}
struct dcerpc_binding_handle *irpc_binding_handle_by_name(TALLOC_CTX *mem_ctx,
struct imessaging_context *msg_ctx,
const char *dest_task,
const struct ndr_interface_table *table)
{
struct dcerpc_binding_handle *h;
struct server_id *sids;
struct server_id sid;
/* find the server task */
sids = irpc_servers_byname(msg_ctx, mem_ctx, dest_task);
if (sids == NULL) {
errno = EADDRNOTAVAIL;
return NULL;
}
if (sids[0].pid == 0) {
talloc_free(sids);
errno = EADDRNOTAVAIL;
return NULL;
}
sid = sids[0];
talloc_free(sids);
h = irpc_binding_handle(mem_ctx, msg_ctx,
sid, table);
if (h == NULL) {
return NULL;
}
return h;
}
void irpc_binding_handle_add_security_token(struct dcerpc_binding_handle *h,
struct security_token *token)
{
struct irpc_bh_state *hs =
dcerpc_binding_handle_data(h,
struct irpc_bh_state);
hs->token = token;
}