summaryrefslogtreecommitdiff
path: root/source4/wrepl_server/wrepl_in_connection.c
blob: e06e69103e2d2a35a58dacd1cb57bc176272128d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
/* 
   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"
#include "nbt_server/wins/winsdb.h"
#include "ldb/include/ldb.h"

void wreplsrv_terminate_in_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;
	const char *peer_ip;

	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_in_connection(wreplconn, "wreplsrv_accept: out of memory");
		return;
	}

	peer_ip	= socket_get_peer_addr(conn->socket, wreplconn);
	if (!peer_ip) {
		wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: out of memory");
		return;
	}

	wreplconn->partner	= wreplsrv_find_partner(service, peer_ip);

	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 %lu\n", (long)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 %lu\n", (long)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_in_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_in_connection(wreplconn, "connection terminated after all pending packets are send");
		return;
	}

	EVENT_FD_NOT_WRITEABLE(conn->event.fde);
	return;

failed:
	wreplsrv_terminate_in_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,
};

/*
  called when we get a new connection
*/
NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner,
				      struct socket_context *sock,
				      struct wreplsrv_in_connection **_wrepl_in)
{
	struct wreplsrv_service *service = partner->service;
	struct wreplsrv_in_connection *wrepl_in;
	const struct model_ops *model_ops;
	struct stream_connection *conn;
	NTSTATUS status;

	/* 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;
	}

	wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection);
	NT_STATUS_HAVE_NO_MEMORY(wrepl_in);

	wrepl_in->service	= service;
	wrepl_in->partner	= partner;
	wrepl_in->our_ip	= socket_get_my_addr(sock, wrepl_in);
	NT_STATUS_HAVE_NO_MEMORY(wrepl_in->our_ip);

	status = stream_new_connection_merge(service->task->event_ctx, model_ops,
					     sock, &wreplsrv_stream_ops, service->task->msg_ctx,
					     wrepl_in, &conn);
	NT_STATUS_NOT_OK_RETURN(status);

	wrepl_in->conn		= conn;
	talloc_steal(conn, wrepl_in);

	*_wrepl_in = wrepl_in;
	return NT_STATUS_OK;
}

/*
  startup the wrepl port 42 server sockets
*/
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, service);
			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, service);
		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;
}