summaryrefslogtreecommitdiff
path: root/source4/smbd/service.c
blob: 8f10c06dff85e898cb8f6a27c8b5dfa4229c9456 (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
/* 
   Unix SMB/CIFS implementation.

   SERVER SERVICE code

   Copyright (C) Andrew Tridgell 2003
   Copyright (C) Stefan (metze) Metzmacher	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 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"

struct server_context *server_service_startup(const char *model)
{
	int i;
	const char **server_services = lp_server_services();
	TALLOC_CTX *mem_ctx;
	struct server_context *srv_ctx;
	const struct model_ops *model_ops;

	if (!server_services) {
		DEBUG(0,("process_model_startup: no endpoint servers configured\n"));
		return NULL;
	}

	model_ops = process_model_startup(model);
	if (!model_ops) {
		DEBUG(0,("process_model_startup('%s') failed\n", model));
		return NULL;
	}

	mem_ctx = talloc_init("server_context");
	if (!mem_ctx) {
		DEBUG(0,("talloc_init(server_context) failed\n"));
		return NULL;
	}

	srv_ctx = talloc_p(mem_ctx, struct server_context);
	if (!srv_ctx) {
		DEBUG(0,("talloc_p(mem_ctx, struct server_context) failed\n"));
		return NULL;	
	}

	ZERO_STRUCTP(srv_ctx);
	srv_ctx->mem_ctx = mem_ctx;

	srv_ctx->events = event_context_init();
	if (!srv_ctx->events) {
		DEBUG(0,("event_context_init() failed\n"));
		return NULL;	
	}


	for (i=0;server_services[i];i++) {
		TALLOC_CTX *mem_ctx2;
		const struct server_service_ops *service_ops;
		struct server_service *service;

		service_ops = server_service_byname(server_services[i]);
		if (!service_ops) {
			DEBUG(0,("process_model_startup: failed to find server service = '%s'\n", server_services[i]));
			return NULL;
		}

		mem_ctx2 = talloc_init("server_service");

		service = talloc_p(mem_ctx2, struct server_service);
		if (!service) {
			DEBUG(0,("talloc_p(mem_ctx, struct server_service) failed\n"));
			return NULL;
		}

		ZERO_STRUCTP(service);
		service->mem_ctx	= mem_ctx2;
		service->ops		= service_ops;
		service->model_ops	= model_ops;
		service->srv_ctx	= srv_ctx;
		
		/* TODO: service_init() should return a result */
		service->ops->service_init(service, model_ops);
	}

	return srv_ctx;
}

/*
  setup a listen stream socket
  if you pass *port == 0, then a port > 1024 is used
 */
struct server_socket *service_setup_socket(struct server_service *service,
                        const struct model_ops *model_ops,
                        const char *sock_addr,
                        uint16_t *port)
{
	NTSTATUS status;
	struct server_socket *srv_sock;
	struct socket_context *socket_ctx;
	struct fd_event fde;
	int i;

	if (*port == 0) {
		for (i=SERVER_TCP_LOW_PORT;i<= SERVER_TCP_HIGH_PORT;i++) {
			status = socket_create("ipv4", SOCKET_TYPE_STREAM, &socket_ctx, 0);
			if (NT_STATUS_IS_OK(status)) {
				*port = i;
				break;
			}
		}
	} else {
		status = socket_create("ipv4", SOCKET_TYPE_STREAM, &socket_ctx, 0);
	}

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("Failed to open socket on %s:%u - %s\n",
			sock_addr, *port, nt_errstr(status)));
		return NULL;
	}

	/* ready to listen */
	status = socket_set_option(socket_ctx, "SO_KEEPALIVE SO_REUSEADDR=1", NULL);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("socket_set_option(socket_ctx, SO_KEEPALIVE, NULL): %s\n",
			nt_errstr(status)));
		socket_destroy(socket_ctx);
		return NULL;
	}
	status = socket_set_option(socket_ctx, lp_socket_options(), NULL);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("socket_set_option(socket_ctx, lp_socket_options(), NULL): %s\n",
			nt_errstr(status)));
		socket_destroy(socket_ctx);
		return NULL;
	}

	/* TODO: set socket ACL's here when they're implemented */

	status = socket_listen(socket_ctx, sock_addr, *port, SERVER_LISTEN_BACKLOG, 0);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("Failed to listen on %s:%u - %s\n",
			sock_addr, *port, nt_errstr(status)));
		socket_destroy(socket_ctx);
		return NULL;
	}

	srv_sock = talloc_p(NULL, struct server_socket);
	if (!srv_sock) {
		DEBUG(0,("talloc_p(mem_ctx, struct server_socket) failed\n"));
		socket_destroy(socket_ctx);
		return NULL;
	}

	/* we are only interested in read events on the listen socket */
	fde.fd          = socket_get_fd(socket_ctx);
	fde.flags       = EVENT_FD_READ;
	fde.private     = srv_sock;
	fde.handler     = model_ops->accept_connection;

	ZERO_STRUCTP(srv_sock);
	srv_sock->mem_ctx       = srv_sock;
	srv_sock->service       = service;
	srv_sock->socket        = socket_ctx;
	srv_sock->event.ctx     = service->srv_ctx->events;
	srv_sock->event.fde     = event_add_fd(srv_sock->event.ctx, &fde);
	if (!srv_sock->event.fde) {
		DEBUG(0,("event_add_fd(srv_sock->event.ctx, &fde) failed\n"));
		socket_destroy(socket_ctx);
		return NULL;
	}

	DLIST_ADD(service->socket_list, srv_sock);

	return srv_sock;
}

struct server_connection *server_setup_connection(struct event_context *ev, struct server_socket *server_socket, struct socket_context *sock, time_t t)
{
	struct fd_event fde;
	struct timed_event idle;
	struct server_connection *srv_conn;

	srv_conn = talloc_p(NULL, struct server_connection);
	if (!srv_conn) {
		DEBUG(0,("talloc_p(mem_ctx, struct server_service_connection) failed\n"));
		return NULL;
	}

	ZERO_STRUCTP(srv_conn);
	srv_conn->mem_ctx = srv_conn;

	fde.private 	= srv_conn;
	fde.fd		= socket_get_fd(sock);
	fde.flags	= EVENT_FD_READ;
	fde.handler	= server_io_handler;

	idle.private 	= srv_conn;
	idle.next_event	= t + SERVER_DEFAULT_IDLE_TIME;
	idle.handler	= server_idle_handler;

	srv_conn->event.ctx		= ev;
	srv_conn->event.fde		= &fde;
	srv_conn->event.idle		= &idle;
	srv_conn->event.idle_time	= SERVER_DEFAULT_IDLE_TIME;

	srv_conn->server_socket		= server_socket;
	srv_conn->service		= server_socket->service;
	srv_conn->socket		= sock;

	/* create a smb server context and add it to out event
	   handling */
	server_socket->service->ops->accept_connection(srv_conn);

	/* accpect_connection() of the service may changed idle.next_event */
	srv_conn->event.fde	= event_add_fd(ev,&fde);
	srv_conn->event.idle	= event_add_timed(ev,&idle);

	if (!socket_check_access(sock, "smbd", lp_hostsallow(-1), lp_hostsdeny(-1))) {
		server_terminate_connection(srv_conn, "denied by access rules");
		return NULL;
	}

	return srv_conn;
}

/*
  close the socket and shutdown a server_context
*/
void server_terminate_connection(struct server_connection *srv_conn, const char *reason)
{
	DEBUG(2,("server_terminate_connection\n"));
	srv_conn->service->model_ops->terminate_connection(srv_conn, reason);
}

void server_destroy_connection(struct server_connection *srv_conn)
{
	socket_destroy(srv_conn->socket);

	event_remove_fd(srv_conn->event.ctx, srv_conn->event.fde);
	srv_conn->event.fde = NULL;
	event_remove_timed(srv_conn->event.ctx, srv_conn->event.idle);
	srv_conn->event.idle = NULL;

	talloc_destroy(srv_conn->mem_ctx);
}

void server_io_handler(struct event_context *ev, struct fd_event *fde, time_t t, uint16_t flags)
{
	struct server_connection *conn = fde->private;

	conn->event.idle->next_event = t + conn->event.idle_time;

	if (flags & EVENT_FD_WRITE) {
		conn->service->ops->send_handler(conn, t, flags);
		return;
	}

	if (flags & EVENT_FD_READ) {
		conn->service->ops->recv_handler(conn, t, flags);
	}

}

void server_idle_handler(struct event_context *ev, struct timed_event *idle, time_t t)
{
	struct server_connection *conn = idle->private;

	conn->event.idle->next_event = t + conn->event.idle_time;

	conn->service->ops->idle_handler(conn,t);
}
/*
  return the operations structure for a named backend of the specified type
*/
const struct server_service_ops *server_service_byname(const char *name)
{
	if (strcmp("smb",name)==0) {
		return smbsrv_get_ops();
	}
	if (strcmp("rpc",name)==0) {
		return dcesrv_get_ops();
	}
	if (strcmp("ldap",name)==0) {
		return ldapsrv_get_ops();
	}
	return NULL;
}

static NTSTATUS register_server_service_ops(const void *_ops)
{
	return NT_STATUS_NOT_IMPLEMENTED;
}

/*
  initialise the SERVER SERVICE subsystem
*/
BOOL server_service_init(void)
{
	NTSTATUS status;

	status = register_subsystem("service", register_server_service_ops); 
	if (!NT_STATUS_IS_OK(status)) {
		return False;
	}

	/* FIXME: Perhaps panic if a basic endpoint server, such as EPMAPER, fails to initialise? */
	static_init_server_service;

	DEBUG(3,("SERVER SERVICE subsystem version %d initialised\n", SERVER_SERVICE_VERSION));
	return True;
}