summaryrefslogtreecommitdiff
path: root/source3/rpc_server/epmd.c
blob: 04fdfb13bb9856bebc750c732a35ffd25e0c1016 (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
/*
 *  Unix SMB/CIFS implementation.
 *
 *  SMBD RPC service callbacks
 *
 *  Copyright (c) 2011      Andreas Schneider <asn@samba.org>
 *
 *  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 "serverid.h"
#include "ntdomain.h"
#include "../librpc/gen_ndr/srv_epmapper.h"
#include "rpc_server/rpc_server.h"
#include "rpc_server/epmapper/srv_epmapper.h"
#include "rpc_server/srv_pipe_register.h"
#include "messages.h"

#define DAEMON_NAME "epmd"

void start_epmd(struct tevent_context *ev_ctx,
		struct messaging_context *msg_ctx);

static bool epmd_open_sockets(struct tevent_context *ev_ctx,
			      struct messaging_context *msg_ctx)
{
	uint32_t num_ifs = iface_count();
	uint16_t port;
	uint32_t i;

	if (lp_interfaces() && lp_bind_interfaces_only()) {
		/*
		 * 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.
		 */

		/* Now open a listen socket for each of the interfaces. */
		for(i = 0; i < num_ifs; i++) {
			const struct sockaddr_storage *ifss =
					iface_n_sockaddr_storage(i);

			port = setup_dcerpc_ncacn_tcpip_socket(ev_ctx,
							       msg_ctx,
							       ndr_table_epmapper.syntax_id,
							       ifss,
							       135);
			if (port == 0) {
				return false;
			}
		}
	} else {
		const char *sock_addr = lp_socket_address();
		const char *sock_ptr;
		char *sock_tok;

		if (strequal(sock_addr, "0.0.0.0") ||
		    strequal(sock_addr, "::")) {
#if HAVE_IPV6
			sock_addr = "::";
#else
			sock_addr = "0.0.0.0";
#endif
		}

		for (sock_ptr = sock_addr;
		     next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,");
		    ) {
			struct sockaddr_storage ss;

			/* open an incoming socket */
			if (!interpret_string_addr(&ss,
						   sock_tok,
						   AI_NUMERICHOST|AI_PASSIVE)) {
				continue;
			}

			port = setup_dcerpc_ncacn_tcpip_socket(ev_ctx,
							       msg_ctx,
							       ndr_table_epmapper.syntax_id,
							       &ss,
							       135);
			if (port == 0) {
				return false;
			}
		}
	}

	return true;
}

static void epmd_reopen_logs(void)
{
	char *lfile = lp_logfile();
	int rc;

	if (lfile == NULL || lfile[0] == '\0') {
		rc = asprintf(&lfile, "%s/log.%s", get_dyn_LOGFILEBASE(), DAEMON_NAME);
		if (rc > 0) {
			lp_set_logfile(lfile);
			SAFE_FREE(lfile);
		}
	} else {
		if (strstr(lfile, DAEMON_NAME) == NULL) {
			rc = asprintf(&lfile, "%s.%s", lp_logfile(), DAEMON_NAME);
			if (rc > 0) {
				lp_set_logfile(lfile);
				SAFE_FREE(lfile);
			}
		}
	}

	reopen_logs();
}

static void epmd_smb_conf_updated(struct messaging_context *msg,
				  void *private_data,
				  uint32_t msg_type,
				  struct server_id server_id,
				  DATA_BLOB *data)
{
	DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
	change_to_root_user();
	epmd_reopen_logs();
}

static void epmd_sig_term_handler(struct tevent_context *ev,
				  struct tevent_signal *se,
				  int signum,
				  int count,
				  void *siginfo,
				  void *private_data)
{
	rpc_epmapper_shutdown();

	exit_server_cleanly("termination signal");
}

static void epmd_setup_sig_term_handler(struct tevent_context *ev_ctx)
{
	struct tevent_signal *se;

	se = tevent_add_signal(ev_ctx,
			       ev_ctx,
			       SIGTERM, 0,
			       epmd_sig_term_handler,
			       NULL);
	if (se == NULL) {
		exit_server("failed to setup SIGTERM handler");
	}
}

static void epmd_sig_hup_handler(struct tevent_context *ev,
				    struct tevent_signal *se,
				    int signum,
				    int count,
				    void *siginfo,
				    void *private_data)
{
	change_to_root_user();

	DEBUG(1,("Reloading printers after SIGHUP\n"));
	epmd_reopen_logs();
}

static void epmd_setup_sig_hup_handler(struct tevent_context *ev_ctx,
				       struct messaging_context *msg_ctx)
{
	struct tevent_signal *se;

	se = tevent_add_signal(ev_ctx,
			       ev_ctx,
			       SIGHUP, 0,
			       epmd_sig_hup_handler,
			       msg_ctx);
	if (se == NULL) {
		exit_server("failed to setup SIGHUP handler");
	}
}

static bool epmapper_shutdown_cb(void *ptr) {
	srv_epmapper_cleanup();

	return true;
}

void start_epmd(struct tevent_context *ev_ctx,
		struct messaging_context *msg_ctx)
{
	struct rpc_srv_callbacks epmapper_cb;
	NTSTATUS status;
	pid_t pid;
	bool ok;
	int rc;

	epmapper_cb.init = NULL;
	epmapper_cb.shutdown = epmapper_shutdown_cb;
	epmapper_cb.private_data = NULL;

	DEBUG(1, ("Forking Endpoint Mapper Daemon\n"));

	pid = sys_fork();

	if (pid == -1) {
		DEBUG(0, ("Failed to fork Endpoint Mapper [%s], aborting ...\n",
			  strerror(errno)));
		exit(1);
	}

	if (pid) {
		/* parent */
		return;
	}

	/* child */
	close_low_fds(false);

	status = reinit_after_fork(msg_ctx,
				   ev_ctx,
				   procid_self(),
				   true);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("reinit_after_fork() failed\n"));
		smb_panic("reinit_after_fork() failed");
	}

	epmd_reopen_logs();

	epmd_setup_sig_term_handler(ev_ctx);
	epmd_setup_sig_hup_handler(ev_ctx, msg_ctx);

	ok = serverid_register(procid_self(),
			       FLAG_MSG_GENERAL|FLAG_MSG_SMBD
			       |FLAG_MSG_PRINT_GENERAL);
	if (!ok) {
		DEBUG(0, ("Failed to register serverid in epmd!\n"));
		exit(1);
	}

	messaging_register(msg_ctx,
			   ev_ctx,
			   MSG_SMB_CONF_UPDATED,
			   epmd_smb_conf_updated);

	status = rpc_epmapper_init(&epmapper_cb);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("Failed to register epmd rpc inteface! (%s)\n",
			  nt_errstr(status)));
		exit(1);
	}

	ok = setup_dcerpc_ncalrpc_socket(ev_ctx,
					 msg_ctx,
					 ndr_table_epmapper.syntax_id,
					 "EPMAPPER",
					 srv_epmapper_delete_endpoints);
	if (!ok) {
		DEBUG(0, ("Failed to open epmd ncalrpc pipe!\n"));
		exit(1);
	}

	ok = epmd_open_sockets(ev_ctx, msg_ctx);
	if (!ok) {
		DEBUG(0, ("Failed to open epmd tcpip sockets!\n"));
		exit(1);
	}

	ok = setup_named_pipe_socket("epmapper", ev_ctx);
	if (!ok) {
		DEBUG(0, ("Failed to open epmd named pipe!\n"));
		exit(1);
	}

	DEBUG(1, ("Endpoint Mapper Daemon Started (%d)\n", getpid()));

	/* loop forever */
	rc = tevent_loop_wait(ev_ctx);

	/* should not be reached */
	DEBUG(0,("background_queue: tevent_loop_wait() exited with %d - %s\n",
		 rc, (rc == 0) ? "out of events" : strerror(errno)));

	exit(1);
}

/* vim: set ts=8 sw=8 noet cindent ft=c.doxygen: */