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|
/*
Unix SMB/CIFS implementation.
low level WINS replication client code
Copyright (C) Andrew Tridgell 2005
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "lib/events/events.h"
#include "dlinklist.h"
#include "lib/socket/socket.h"
#include "libcli/wrepl/winsrepl.h"
/*
mark all pending requests as dead - called when a socket error happens
*/
static void wrepl_socket_dead(struct wrepl_socket *wrepl_socket, NTSTATUS status)
{
wrepl_socket->dead = True;
if (wrepl_socket->fde) {
talloc_free(wrepl_socket->fde);
wrepl_socket->fde = NULL;
}
if (wrepl_socket->sock) {
talloc_free(wrepl_socket->sock);
wrepl_socket->sock = NULL;
}
if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
}
while (wrepl_socket->send_queue) {
struct wrepl_request *req = wrepl_socket->send_queue;
DLIST_REMOVE(wrepl_socket->send_queue, req);
req->state = WREPL_REQUEST_ERROR;
req->status = status;
if (req->async.fn) {
req->async.fn(req);
}
}
while (wrepl_socket->recv_queue) {
struct wrepl_request *req = wrepl_socket->recv_queue;
DLIST_REMOVE(wrepl_socket->recv_queue, req);
req->state = WREPL_REQUEST_ERROR;
req->status = status;
if (req->async.fn) {
req->async.fn(req);
}
}
}
static void wrepl_request_timeout_handler(struct event_context *ev, struct timed_event *te,
struct timeval t, void *ptr)
{
struct wrepl_request *req = talloc_get_type(ptr, struct wrepl_request);
wrepl_socket_dead(req->wrepl_socket, NT_STATUS_IO_TIMEOUT);
}
/*
handle send events
*/
static void wrepl_handler_send(struct wrepl_socket *wrepl_socket)
{
while (wrepl_socket->send_queue) {
struct wrepl_request *req = wrepl_socket->send_queue;
size_t nsent;
NTSTATUS status;
status = socket_send(wrepl_socket->sock, &req->buffer, &nsent, 0);
if (NT_STATUS_IS_ERR(status)) {
wrepl_socket_dead(wrepl_socket, status);
return;
}
if (!NT_STATUS_IS_OK(status) || nsent == 0) return;
req->buffer.data += nsent;
req->buffer.length -= nsent;
if (req->buffer.length != 0) {
return;
}
DLIST_REMOVE(wrepl_socket->send_queue, req);
DLIST_ADD_END(wrepl_socket->recv_queue, req, struct wrepl_request *);
req->state = WREPL_REQUEST_RECV;
EVENT_FD_READABLE(wrepl_socket->fde);
}
EVENT_FD_NOT_WRITEABLE(wrepl_socket->fde);
}
/*
handle recv events
*/
static void wrepl_handler_recv(struct wrepl_socket *wrepl_socket)
{
size_t nread;
struct wrepl_request *req = wrepl_socket->recv_queue;
DATA_BLOB blob;
if (req == NULL) {
NTSTATUS status;
EVENT_FD_NOT_READABLE(wrepl_socket->fde);
status = socket_recv(wrepl_socket->sock, NULL, 0, &nread, 0);
if (NT_STATUS_EQUAL(NT_STATUS_END_OF_FILE,status)) return;
if (NT_STATUS_IS_ERR(status)) {
wrepl_socket_dead(wrepl_socket, status);
return;
}
return;
}
if (req->buffer.length == 0) {
req->buffer = data_blob_talloc(req, NULL, 4);
if (req->buffer.data == NULL) {
req->status = NT_STATUS_NO_MEMORY;
goto failed;
}
req->num_read = 0;
}
/* read in the packet length */
if (req->num_read < 4) {
uint32_t req_length;
req->status = socket_recv(wrepl_socket->sock,
req->buffer.data + req->num_read,
4 - req->num_read,
&nread, 0);
if (NT_STATUS_IS_ERR(req->status)) {
wrepl_socket_dead(wrepl_socket, req->status);
return;
}
if (!NT_STATUS_IS_OK(req->status)) return;
req->num_read += nread;
if (req->num_read != 4) return;
req_length = RIVAL(req->buffer.data, 0) + 4;
req->buffer.data = talloc_realloc(req, req->buffer.data,
uint8_t, req_length);
if (req->buffer.data == NULL) {
req->status = NT_STATUS_NO_MEMORY;
goto failed;
}
req->buffer.length = req_length;
}
/* read in the body */
req->status = socket_recv(wrepl_socket->sock,
req->buffer.data + req->num_read,
req->buffer.length - req->num_read,
&nread, 0);
if (NT_STATUS_IS_ERR(req->status)) {
wrepl_socket_dead(wrepl_socket, req->status);
return;
}
if (!NT_STATUS_IS_OK(req->status)) return;
req->num_read += nread;
if (req->num_read != req->buffer.length) return;
req->packet = talloc(req, struct wrepl_packet);
if (req->packet == NULL) {
req->status = NT_STATUS_NO_MEMORY;
goto failed;
}
blob.data = req->buffer.data + 4;
blob.length = req->buffer.length - 4;
/* we have a full request - parse it */
req->status = ndr_pull_struct_blob(&blob,
req->packet, req->packet,
(ndr_pull_flags_fn_t)ndr_pull_wrepl_packet);
if (!NT_STATUS_IS_OK(req->status)) {
DEBUG(2,("Failed to parse incoming WINS packet - %s\n",
nt_errstr(req->status)));
DEBUG(10,("packet length %d\n", (int)req->buffer.length));
NDR_PRINT_DEBUG(wrepl_packet, req->packet);
goto failed;
}
if (DEBUGLVL(10)) {
DEBUG(10,("Received WINS packet of length %d\n", (int)req->buffer.length));
NDR_PRINT_DEBUG(wrepl_packet, req->packet);
}
DLIST_REMOVE(wrepl_socket->recv_queue, req);
req->state = WREPL_REQUEST_DONE;
if (req->async.fn) {
req->async.fn(req);
}
return;
failed:
if (req->state == WREPL_REQUEST_RECV) {
DLIST_REMOVE(wrepl_socket->recv_queue, req);
}
req->state = WREPL_REQUEST_ERROR;
if (req->async.fn) {
req->async.fn(req);
}
}
/*
handler for winrepl events
*/
static void wrepl_handler(struct event_context *ev, struct fd_event *fde,
uint16_t flags, void *private)
{
struct wrepl_socket *wrepl_socket = talloc_get_type(private,
struct wrepl_socket);
if (flags & EVENT_FD_WRITE) {
wrepl_handler_send(wrepl_socket);
}
if (flags & EVENT_FD_READ) {
wrepl_handler_recv(wrepl_socket);
}
}
/*
handler for winrepl connection completion
*/
static void wrepl_connect_handler(struct event_context *ev, struct fd_event *fde,
uint16_t flags, void *private)
{
struct wrepl_socket *wrepl_socket = talloc_get_type(private,
struct wrepl_socket);
struct wrepl_request *req = wrepl_socket->recv_queue;
talloc_free(wrepl_socket->fde);
wrepl_socket->fde = NULL;
if (req == NULL) return;
req->status = socket_connect_complete(wrepl_socket->sock, 0);
if (NT_STATUS_IS_ERR(req->status)) goto failed;
if (!NT_STATUS_IS_OK(req->status)) return;
wrepl_socket->fde = event_add_fd(wrepl_socket->event_ctx, wrepl_socket,
socket_get_fd(wrepl_socket->sock),
0,
wrepl_handler, wrepl_socket);
if (wrepl_socket->fde == NULL) {
req->status = NT_STATUS_NO_MEMORY;
}
failed:
DLIST_REMOVE(wrepl_socket->recv_queue, req);
if (!NT_STATUS_IS_OK(req->status)) {
req->state = WREPL_REQUEST_ERROR;
} else {
req->state = WREPL_REQUEST_DONE;
}
if (req->async.fn) {
req->async.fn(req);
}
}
/*
destroy a wrepl_socket destructor
*/
static int wrepl_socket_destructor(void *ptr)
{
struct wrepl_socket *sock = talloc_get_type(ptr, struct wrepl_socket);
wrepl_socket_dead(sock, NT_STATUS_CONNECTION_DISCONNECTED);
return 0;
}
/*
initialise a wrepl_socket. The event_ctx is optional, if provided then
operations will use that event context
*/
struct wrepl_socket *wrepl_socket_init(TALLOC_CTX *mem_ctx,
struct event_context *event_ctx)
{
struct wrepl_socket *wrepl_socket;
NTSTATUS status;
wrepl_socket = talloc(mem_ctx, struct wrepl_socket);
if (wrepl_socket == NULL) goto failed;
if (event_ctx == NULL) {
wrepl_socket->event_ctx = event_context_init(wrepl_socket);
} else {
wrepl_socket->event_ctx = talloc_reference(wrepl_socket, event_ctx);
}
if (wrepl_socket->event_ctx == NULL) goto failed;
status = socket_create("ip", SOCKET_TYPE_STREAM, &wrepl_socket->sock, 0);
if (!NT_STATUS_IS_OK(status)) goto failed;
talloc_steal(wrepl_socket, wrepl_socket->sock);
wrepl_socket->send_queue = NULL;
wrepl_socket->recv_queue = NULL;
wrepl_socket->request_timeout = WREPL_SOCKET_REQUEST_TIMEOUT;
wrepl_socket->dead = False;
wrepl_socket->fde = event_add_fd(wrepl_socket->event_ctx, wrepl_socket,
socket_get_fd(wrepl_socket->sock),
EVENT_FD_WRITE,
wrepl_connect_handler, wrepl_socket);
set_blocking(socket_get_fd(wrepl_socket->sock), False);
talloc_set_destructor(wrepl_socket, wrepl_socket_destructor);
return wrepl_socket;
failed:
talloc_free(wrepl_socket);
return NULL;
}
/*
destroy a wrepl_request
*/
static int wrepl_request_destructor(void *ptr)
{
struct wrepl_request *req = talloc_get_type(ptr, struct wrepl_request);
if (req->state == WREPL_REQUEST_SEND) {
DLIST_REMOVE(req->wrepl_socket->send_queue, req);
}
if (req->state == WREPL_REQUEST_RECV) {
DLIST_REMOVE(req->wrepl_socket->recv_queue, req);
}
req->state = WREPL_REQUEST_ERROR;
return 0;
}
/*
wait for a request to complete
*/
static NTSTATUS wrepl_request_wait(struct wrepl_request *req)
{
NT_STATUS_HAVE_NO_MEMORY(req);
while (req->state < WREPL_REQUEST_DONE) {
event_loop_once(req->wrepl_socket->event_ctx);
}
return req->status;
}
/*
connect a wrepl_socket to a WINS server
*/
struct wrepl_request *wrepl_connect_send(struct wrepl_socket *wrepl_socket,
const char *address)
{
struct wrepl_request *req;
NTSTATUS status;
req = talloc_zero(wrepl_socket, struct wrepl_request);
if (req == NULL) goto failed;
req->wrepl_socket = wrepl_socket;
req->state = WREPL_REQUEST_RECV;
DLIST_ADD(wrepl_socket->recv_queue, req);
talloc_set_destructor(req, wrepl_request_destructor);
status = socket_connect(wrepl_socket->sock, iface_best_ip(address), 0, address,
WINS_REPLICATION_PORT, 0);
if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) goto failed;
return req;
failed:
talloc_free(req);
return NULL;
}
/*
connect a wrepl_socket to a WINS server - recv side
*/
NTSTATUS wrepl_connect_recv(struct wrepl_request *req)
{
return wrepl_request_wait(req);
}
/*
connect a wrepl_socket to a WINS server - sync API
*/
NTSTATUS wrepl_connect(struct wrepl_socket *wrepl_socket, const char *address)
{
struct wrepl_request *req = wrepl_connect_send(wrepl_socket, address);
return wrepl_connect_recv(req);
}
/*
callback from wrepl_request_trigger()
*/
static void wrepl_request_trigger_handler(struct event_context *ev, struct timed_event *te,
struct timeval t, void *ptr)
{
struct wrepl_request *req = talloc_get_type(ptr, struct wrepl_request);
if (req->async.fn) {
req->async.fn(req);
}
}
/*
trigger an immediate event on a wrepl_request
*/
static void wrepl_request_trigger(struct wrepl_request *req)
{
/* a zero timeout means immediate */
event_add_timed(req->wrepl_socket->event_ctx,
req, timeval_zero(),
wrepl_request_trigger_handler, req);
}
/*
send a generic wins replication request
*/
struct wrepl_request *wrepl_request_send(struct wrepl_socket *wrepl_socket,
struct wrepl_packet *packet)
{
struct wrepl_request *req;
struct wrepl_wrap wrap;
req = talloc_zero(wrepl_socket, struct wrepl_request);
if (req == NULL) goto failed;
if (wrepl_socket->dead) {
req->wrepl_socket = wrepl_socket;
req->state = WREPL_REQUEST_ERROR;
req->status = NT_STATUS_INVALID_CONNECTION;
wrepl_request_trigger(req);
return req;
}
req->wrepl_socket = wrepl_socket;
req->state = WREPL_REQUEST_SEND;
wrap.packet = *packet;
req->status = ndr_push_struct_blob(&req->buffer, req, &wrap,
(ndr_push_flags_fn_t)ndr_push_wrepl_wrap);
if (!NT_STATUS_IS_OK(req->status)) goto failed;
if (DEBUGLVL(10)) {
DEBUG(10,("Sending WINS packet of length %d\n", (int)req->buffer.length));
NDR_PRINT_DEBUG(wrepl_packet, &wrap.packet);
}
DLIST_ADD(wrepl_socket->send_queue, req);
talloc_set_destructor(req, wrepl_request_destructor);
if (wrepl_socket->request_timeout > 0) {
req->te = event_add_timed(wrepl_socket->event_ctx, req,
timeval_current_ofs(wrepl_socket->request_timeout, 0),
wrepl_request_timeout_handler, req);
}
EVENT_FD_WRITEABLE(wrepl_socket->fde);
return req;
failed:
talloc_free(req);
return NULL;
}
/*
receive a generic WINS replication reply
*/
NTSTATUS wrepl_request_recv(struct wrepl_request *req,
TALLOC_CTX *mem_ctx,
struct wrepl_packet **packet)
{
NTSTATUS status = wrepl_request_wait(req);
if (NT_STATUS_IS_OK(status)) {
*packet = talloc_steal(mem_ctx, req->packet);
}
talloc_free(req);
return status;
}
/*
a full WINS replication request/response
*/
NTSTATUS wrepl_request(struct wrepl_socket *wrepl_socket,
TALLOC_CTX *mem_ctx,
struct wrepl_packet *req_packet,
struct wrepl_packet **reply_packet)
{
struct wrepl_request *req = wrepl_request_send(wrepl_socket, req_packet);
return wrepl_request_recv(req, mem_ctx, reply_packet);
}
/*
setup an association - send
*/
struct wrepl_request *wrepl_associate_send(struct wrepl_socket *wrepl_socket,
struct wrepl_associate *io)
{
struct wrepl_packet *packet;
struct wrepl_request *req;
packet = talloc_zero(wrepl_socket, struct wrepl_packet);
if (packet == NULL) return NULL;
packet->opcode = WREPL_OPCODE_BITS;
packet->mess_type = WREPL_START_ASSOCIATION;
packet->message.start.minor_version = 2;
packet->message.start.major_version = 5;
req = wrepl_request_send(wrepl_socket, packet);
talloc_free(packet);
return req;
}
/*
setup an association - recv
*/
NTSTATUS wrepl_associate_recv(struct wrepl_request *req,
struct wrepl_associate *io)
{
struct wrepl_packet *packet=NULL;
NTSTATUS status;
status = wrepl_request_recv(req, req->wrepl_socket, &packet);
NT_STATUS_NOT_OK_RETURN(status);
if (packet->mess_type != WREPL_START_ASSOCIATION_REPLY) {
status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
}
if (NT_STATUS_IS_OK(status)) {
io->out.assoc_ctx = packet->message.start_reply.assoc_ctx;
}
talloc_free(packet);
return status;
}
/*
setup an association - sync api
*/
NTSTATUS wrepl_associate(struct wrepl_socket *wrepl_socket,
struct wrepl_associate *io)
{
struct wrepl_request *req = wrepl_associate_send(wrepl_socket, io);
return wrepl_associate_recv(req, io);
}
/*
fetch the partner tables - send
*/
struct wrepl_request *wrepl_pull_table_send(struct wrepl_socket *wrepl_socket,
struct wrepl_pull_table *io)
{
struct wrepl_packet *packet;
struct wrepl_request *req;
packet = talloc_zero(wrepl_socket, struct wrepl_packet);
if (packet == NULL) return NULL;
packet->opcode = WREPL_OPCODE_BITS;
packet->assoc_ctx = io->in.assoc_ctx;
packet->mess_type = WREPL_REPLICATION;
packet->message.replication.command = WREPL_REPL_TABLE_QUERY;
req = wrepl_request_send(wrepl_socket, packet);
talloc_free(packet);
return req;
}
/*
fetch the partner tables - recv
*/
NTSTATUS wrepl_pull_table_recv(struct wrepl_request *req,
TALLOC_CTX *mem_ctx,
struct wrepl_pull_table *io)
{
struct wrepl_packet *packet=NULL;
NTSTATUS status;
struct wrepl_table *table;
int i;
status = wrepl_request_recv(req, req->wrepl_socket, &packet);
NT_STATUS_NOT_OK_RETURN(status);
if (packet->mess_type != WREPL_REPLICATION) {
status = NT_STATUS_NETWORK_ACCESS_DENIED;
} else if (packet->message.replication.command != WREPL_REPL_TABLE_REPLY) {
status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
}
if (!NT_STATUS_IS_OK(status)) goto failed;
table = &packet->message.replication.info.table;
io->out.num_partners = table->partner_count;
io->out.partners = talloc_steal(mem_ctx, table->partners);
for (i=0;i<io->out.num_partners;i++) {
talloc_steal(io->out.partners, io->out.partners[i].address);
}
failed:
talloc_free(packet);
return status;
}
/*
fetch the partner table - sync api
*/
NTSTATUS wrepl_pull_table(struct wrepl_socket *wrepl_socket,
TALLOC_CTX *mem_ctx,
struct wrepl_pull_table *io)
{
struct wrepl_request *req = wrepl_pull_table_send(wrepl_socket, io);
return wrepl_pull_table_recv(req, mem_ctx, io);
}
/*
fetch the names for a WINS partner - send
*/
struct wrepl_request *wrepl_pull_names_send(struct wrepl_socket *wrepl_socket,
struct wrepl_pull_names *io)
{
struct wrepl_packet *packet;
struct wrepl_request *req;
packet = talloc_zero(wrepl_socket, struct wrepl_packet);
if (packet == NULL) return NULL;
packet->opcode = WREPL_OPCODE_BITS;
packet->assoc_ctx = io->in.assoc_ctx;
packet->mess_type = WREPL_REPLICATION;
packet->message.replication.command = WREPL_REPL_SEND_REQUEST;
packet->message.replication.info.owner = io->in.partner;
req = wrepl_request_send(wrepl_socket, packet);
talloc_free(packet);
return req;
}
/*
fetch the names for a WINS partner - recv
*/
NTSTATUS wrepl_pull_names_recv(struct wrepl_request *req,
TALLOC_CTX *mem_ctx,
struct wrepl_pull_names *io)
{
struct wrepl_packet *packet=NULL;
NTSTATUS status;
int i;
status = wrepl_request_recv(req, req->wrepl_socket, &packet);
NT_STATUS_NOT_OK_RETURN(status);
if (packet->mess_type != WREPL_REPLICATION ||
packet->message.replication.command != WREPL_REPL_SEND_REPLY) {
status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
}
if (!NT_STATUS_IS_OK(status)) goto failed;
io->out.num_names = packet->message.replication.info.reply.num_names;
status = NT_STATUS_NO_MEMORY;
io->out.names = talloc_array(packet, struct wrepl_name, io->out.num_names);
if (io->out.names == NULL) goto nomem;
/* convert the list of names and addresses to a sane format */
for (i=0;i<io->out.num_names;i++) {
struct wrepl_wins_name *wname = &packet->message.replication.info.reply.names[i];
struct wrepl_name *name = &io->out.names[i];
name->name = wname->name;
talloc_steal(io->out.names, wname->name.name);
talloc_steal(io->out.names, wname->name.scope);
name->type = WREPL_NAME_TYPE(wname->flags);
name->state = WREPL_NAME_STATE(wname->flags);
name->node = WREPL_NBT_NODE(wname->flags);
name->is_static = WREPL_NAME_IS_STATIC(wname->flags);
name->raw_flags = wname->flags;
name->version_id= wname->id;
name->owner = talloc_strdup(io->out.names, io->in.partner.address);
if (name->owner == NULL) goto nomem;
/* trying to save 1 or 2 bytes on the wire isn't a good idea */
if (wname->flags & 2) {
int j;
name->num_addresses = wname->addresses.addresses.num_ips;
name->addresses = talloc_array(io->out.names,
struct wrepl_address,
name->num_addresses);
if (name->addresses == NULL) goto nomem;
for (j=0;j<name->num_addresses;j++) {
name->addresses[j].owner =
talloc_steal(name->addresses,
wname->addresses.addresses.ips[j].owner);
name->addresses[j].address =
talloc_steal(name->addresses,
wname->addresses.addresses.ips[j].ip);
}
} else {
name->num_addresses = 1;
name->addresses = talloc(io->out.names, struct wrepl_address);
if (name->addresses == NULL) goto nomem;
name->addresses[0].owner = talloc_strdup(name->addresses,io->in.partner.address);
if (name->addresses[0].owner == NULL) goto nomem;
name->addresses[0].address = talloc_steal(name->addresses,
wname->addresses.ip);
}
}
talloc_steal(mem_ctx, io->out.names);
talloc_free(packet);
return NT_STATUS_OK;
nomem:
status = NT_STATUS_NO_MEMORY;
failed:
talloc_free(packet);
return status;
}
/*
fetch the names for a WINS partner - sync api
*/
NTSTATUS wrepl_pull_names(struct wrepl_socket *wrepl_socket,
TALLOC_CTX *mem_ctx,
struct wrepl_pull_names *io)
{
struct wrepl_request *req = wrepl_pull_names_send(wrepl_socket, io);
return wrepl_pull_names_recv(req, mem_ctx, io);
}
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