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samba-mirror/source4/wrepl_server/wrepl_server.c
Stefan Metzmacher d49e67f06f r11014: r10139@SERNOX: metze | 2005-09-10 10:32:36 +0200
- w2k just ignores invalid packets, so we do now
 - w2k only checks the assoc_ctx when the opcode has the sepcific obcode bit's set
 - terminate the connection, when getting a WREPL_STOP_ASSOCIATION packet
 - some more special error handling

 proper torture test for all this cases are following later

 metze
(This used to be commit 42b69461aa)
2007-10-10 13:41:30 -05:00

364 lines
10 KiB
C

/*
Unix SMB/CIFS implementation.
WINS Replication server
Copyright (C) Stefan Metzmacher 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 "dlinklist.h"
#include "lib/events/events.h"
#include "lib/socket/socket.h"
#include "smbd/service_task.h"
#include "smbd/service_stream.h"
#include "lib/messaging/irpc.h"
#include "librpc/gen_ndr/ndr_winsrepl.h"
#include "wrepl_server/wrepl_server.h"
void wreplsrv_terminate_connection(struct wreplsrv_in_connection *wreplconn, const char *reason)
{
stream_terminate_connection(wreplconn->conn, reason);
}
/*
called when we get a new connection
*/
static void wreplsrv_accept(struct stream_connection *conn)
{
struct wreplsrv_service *service = talloc_get_type(conn->private, struct wreplsrv_service);
struct wreplsrv_in_connection *wreplconn;
wreplconn = talloc_zero(conn, struct wreplsrv_in_connection);
if (!wreplconn) {
stream_terminate_connection(conn, "wreplsrv_accept: out of memory");
return;
}
wreplconn->conn = conn;
wreplconn->service = service;
wreplconn->our_ip = socket_get_my_addr(conn->socket, wreplconn);
if (!wreplconn->our_ip) {
wreplsrv_terminate_connection(wreplconn, "wreplsrv_accept: out of memory");
return;
}
/* TODO: find out if it's a partner */
conn->private = wreplconn;
irpc_add_name(conn->msg_ctx, "wreplsrv_connection");
}
/*
receive some data on a WREPL connection
*/
static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags)
{
struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private, struct wreplsrv_in_connection);
struct wreplsrv_in_call *call;
DATA_BLOB packet_in_blob;
DATA_BLOB packet_out_blob;
struct wrepl_wrap packet_out_wrap;
struct data_blob_list_item *rep;
NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
size_t nread;
/* avoid recursion, because of half async code */
if (wreplconn->processing) {
EVENT_FD_NOT_READABLE(conn->event.fde);
return;
}
if (wreplconn->partial.length == 0) {
wreplconn->partial = data_blob_talloc(wreplconn, NULL, 4);
if (wreplconn->partial.data == NULL) {
status = NT_STATUS_NO_MEMORY;
goto failed;
}
wreplconn->partial_read = 0;
}
/* read in the packet length */
if (wreplconn->partial_read < 4) {
uint32_t packet_length;
status = socket_recv(conn->socket,
wreplconn->partial.data + wreplconn->partial_read,
4 - wreplconn->partial_read,
&nread, 0);
if (NT_STATUS_IS_ERR(status)) goto failed;
if (!NT_STATUS_IS_OK(status)) return;
wreplconn->partial_read += nread;
if (wreplconn->partial_read != 4) return;
packet_length = RIVAL(wreplconn->partial.data, 0) + 4;
wreplconn->partial.data = talloc_realloc(wreplconn, wreplconn->partial.data,
uint8_t, packet_length);
if (wreplconn->partial.data == NULL) {
status = NT_STATUS_NO_MEMORY;
goto failed;
}
wreplconn->partial.length = packet_length;
}
/* read in the body */
status = socket_recv(conn->socket,
wreplconn->partial.data + wreplconn->partial_read,
wreplconn->partial.length - wreplconn->partial_read,
&nread, 0);
if (NT_STATUS_IS_ERR(status)) goto failed;
if (!NT_STATUS_IS_OK(status)) return;
wreplconn->partial_read += nread;
if (wreplconn->partial_read != wreplconn->partial.length) return;
packet_in_blob.data = wreplconn->partial.data + 4;
packet_in_blob.length = wreplconn->partial.length - 4;
call = talloc_zero(wreplconn, struct wreplsrv_in_call);
if (!call) {
status = NT_STATUS_NO_MEMORY;
goto failed;
}
call->wreplconn = wreplconn;
/* we have a full request - parse it */
status = ndr_pull_struct_blob(&packet_in_blob,
call, &call->req_packet,
(ndr_pull_flags_fn_t)ndr_pull_wrepl_packet);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(2,("Failed to parse incoming WINS-Replication packet - %s\n",
nt_errstr(status)));
DEBUG(10,("packet length %u\n", wreplconn->partial.length));
NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet);
goto failed;
}
/*
* we have parsed the request, so we can reset the wreplconn->partial_read,
* maybe we could also free wreplconn->partial, but for now we keep it,
* and overwrite it the next time
*/
wreplconn->partial_read = 0;
if (DEBUGLVL(10)) {
DEBUG(10,("Received WINS-Replication packet of length %u\n", wreplconn->partial.length));
NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet);
}
/* actually process the request */
wreplconn->processing = True;
status = wreplsrv_in_call(call);
wreplconn->processing = False;
if (NT_STATUS_IS_ERR(status)) goto failed;
if (!NT_STATUS_IS_OK(status)) {
/* w2k just ignores invalid packets, so we do */
DEBUG(10,("Received WINS-Replication packet was invalid, we just ignore it\n"));
talloc_free(call);
return;
}
/* and now encode the reply */
packet_out_wrap.packet = call->rep_packet;
status = ndr_push_struct_blob(&packet_out_blob, call, &packet_out_wrap,
(ndr_push_flags_fn_t)ndr_push_wrepl_wrap);
if (!NT_STATUS_IS_OK(status)) goto failed;
if (DEBUGLVL(10)) {
DEBUG(10,("Sending WINS-Replication packet of length %d\n", (int)packet_out_blob.length));
NDR_PRINT_DEBUG(wrepl_packet, &call->rep_packet);
}
rep = talloc(wreplconn, struct data_blob_list_item);
if (!rep) {
status = NT_STATUS_NO_MEMORY;
goto failed;
}
rep->blob = packet_out_blob;
talloc_steal(rep, packet_out_blob.data);
/* we don't need the call anymore */
talloc_free(call);
if (!wreplconn->send_queue) {
EVENT_FD_WRITEABLE(conn->event.fde);
}
DLIST_ADD_END(wreplconn->send_queue, rep, struct data_blob_list_item *);
if (wreplconn->terminate) {
EVENT_FD_NOT_READABLE(conn->event.fde);
} else {
EVENT_FD_READABLE(conn->event.fde);
}
return;
failed:
wreplsrv_terminate_connection(wreplconn, nt_errstr(status));
}
/*
called when we can write to a connection
*/
static void wreplsrv_send(struct stream_connection *conn, uint16_t flags)
{
struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private, struct wreplsrv_in_connection);
NTSTATUS status;
while (wreplconn->send_queue) {
struct data_blob_list_item *rep = wreplconn->send_queue;
size_t sendlen;
status = socket_send(conn->socket, &rep->blob, &sendlen, 0);
if (NT_STATUS_IS_ERR(status)) goto failed;
if (!NT_STATUS_IS_OK(status)) return;
rep->blob.length -= sendlen;
rep->blob.data += sendlen;
if (rep->blob.length == 0) {
DLIST_REMOVE(wreplconn->send_queue, rep);
talloc_free(rep);
}
}
if (wreplconn->terminate) {
wreplsrv_terminate_connection(wreplconn, "connection terminated after all pending packets are send");
return;
}
EVENT_FD_NOT_WRITEABLE(conn->event.fde);
return;
failed:
wreplsrv_terminate_connection(wreplconn, nt_errstr(status));
}
static const struct stream_server_ops wreplsrv_stream_ops = {
.name = "wreplsrv",
.accept_connection = wreplsrv_accept,
.recv_handler = wreplsrv_recv,
.send_handler = wreplsrv_send,
};
/*
startup the wrepl port 42 server sockets
*/
static NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service)
{
NTSTATUS status;
struct task_server *task = service->task;
const struct model_ops *model_ops;
const char *address;
uint16_t port = WINS_REPLICATION_PORT;
/* within the wrepl task we want to be a single process, so
ask for the single process model ops and pass these to the
stream_setup_socket() call. */
model_ops = process_model_byname("single");
if (!model_ops) {
DEBUG(0,("Can't find 'single' process model_ops"));
return NT_STATUS_INTERNAL_ERROR;
}
if (lp_interfaces() && lp_bind_interfaces_only()) {
int num_interfaces = iface_count();
int i;
/* We have been given an interfaces line, and been
told to only bind to those interfaces. Create a
socket per interface and bind to only these.
*/
for(i = 0; i < num_interfaces; i++) {
address = iface_n_ip(i);
status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
"ipv4", address, &port, NULL);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
address, port, nt_errstr(status)));
return status;
}
}
} else {
address = lp_socket_address();
status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
"ipv4", address, &port, NULL);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
address, port, nt_errstr(status)));
return status;
}
}
return NT_STATUS_OK;
}
/*
startup the wrepl task
*/
static void wreplsrv_task_init(struct task_server *task)
{
NTSTATUS status;
struct wreplsrv_service *service;
service = talloc_zero(task, struct wreplsrv_service);
if (!service) {
task_server_terminate(task, "wreplsrv_task_init: out of memory");
return;
}
service->task = task;
task->private = service;
/*
* TODO: setup up all partners, and open the winsdb
*/
/*
* setup listen sockets, so we can anwser requests from our partners,
* which pull from us
*/
status = wreplsrv_setup_sockets(service);
if (!NT_STATUS_IS_OK(status)) {
task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed");
return;
}
/*
* TODO: setup timed events for each partner we want to pull from
*/
irpc_add_name(task->msg_ctx, "wrepl_server");
}
/*
initialise the WREPL server
*/
static NTSTATUS wreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops)
{
return task_server_startup(event_ctx, model_ops, wreplsrv_task_init);
}
/*
register ourselves as a available server
*/
NTSTATUS server_service_wrepl_init(void)
{
return register_server_service("wrepl", wreplsrv_init);
}