aboutsummaryrefslogtreecommitdiffstats
path: root/src/main_stp.c
blob: a9fc6181f151ad31687fe88a3f51e1ea7b9acd99 (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
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
/* Relay UDT/all SCCP messages */
/*
 * (C) 2010-2011 by Holger Hans Peter Freyther <zecke@selfish.org>
 * (C) 2010-2011 by On-Waves
 * All Rights Reserved
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

#include <mtp_data.h>
#include <mtp_level3.h>
#include <mtp_pcap.h>
#include <thread.h>
#include <bsc_data.h>
#include <snmp_mtp.h>
#include <cellmgr_debug.h>
#include <sctp_m2ua.h>
#include <ss7_application.h>

#include <osmocom/m2ua/m2ua_msg.h>

#include <osmocore/talloc.h>

#include <osmocom/vty/vty.h>
#include <osmocom/vty/telnet_interface.h>

#include <sys/stat.h>
#include <sys/types.h>

#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <unistd.h>

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <getopt.h>

#undef PACKAGE_NAME
#undef PACKAGE_VERSION
#undef PACKAGE_BUGREPORT
#undef PACKAGE_TARNAME
#undef PACKAGE_STRING
#include <cellmgr_config.h>

static struct log_target *stderr_target;

static char *config = "osmo_stp.cfg";

struct bsc_data *bsc;
extern void cell_vty_init(void);

/*
 * methods called from the MTP Level3 part
 */
static void print_usage()
{
	printf("Usage: osmo-stp\n");
}

static void sigint()
{
	static pthread_mutex_t exit_mutex = PTHREAD_MUTEX_INITIALIZER;
	static int handled = 0;

	struct mtp_link_set *set;

	/* failed to lock */
	if (pthread_mutex_trylock(&exit_mutex) != 0)
		return;
	if (handled)
		goto out;

	printf("Terminating.\n");
	handled = 1;
	if (bsc && bsc->setup) {
		llist_for_each_entry(set, &bsc->linksets, entry)
			link_shutdown_all(set);
	}
	exit(0);

out:
	pthread_mutex_unlock(&exit_mutex);
}

static void print_help()
{
	printf("  Some useful help...\n");
	printf("  -h --help this text\n");
	printf("  -c --config=CFG The config file to use.\n");
	printf("  -p --pcap=FILE. Write MSUs to the PCAP file.\n");
	printf("  -c --once. Send the SLTM msg only once.\n");
	printf("  -v --version. Print the version number\n");
}

static void handle_options(int argc, char **argv)
{
	while (1) {
		int option_index = 0, c;
		static struct option long_options[] = {
			{"help", 0, 0, 'h'},
			{"config", 1, 0, 'c'},
			{"pcap", 1, 0, 'p'},
			{"version", 0, 0, 0},
			{0, 0, 0, 0},
		};

		c = getopt_long(argc, argv, "hc:p:v",
				long_options, &option_index);
		if (c == -1)
			break;

		switch (c) {
		case 'h':
			print_usage();
			print_help();
			exit(0);
		case 'p':
			if (bsc->pcap_fd >= 0)
				close(bsc->pcap_fd);
			bsc->pcap_fd = open(optarg, O_WRONLY | O_TRUNC | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP| S_IROTH);
			if (bsc->pcap_fd < 0) {
				fprintf(stderr, "Failed to open PCAP file.\n");
				exit(0);
			}
			mtp_pcap_write_header(bsc->pcap_fd);
			break;
		case 'c':
			config = optarg;
			break;
		case 'v':
			printf("This is %s version %s.\n", PACKAGE, VERSION);
			exit(0);
			break;
		default:
			fprintf(stderr, "Unknown option.\n");
			break;
		}
	}
}

static struct mtp_link_set *find_link_set(struct bsc_data *bsc,
					  int len, const char *buf)
{
	struct mtp_link_set *set;

	llist_for_each_entry(set, &bsc->linksets, entry)
		if (strncmp(buf, set->name, len) == 0)
			return set;

	return NULL;
}

static int inject_read_cb(struct bsc_fd *fd, unsigned int what)
{
	struct msgb *msg;
	struct m2ua_msg_part *data, *link;
	struct bsc_data *bsc;
	struct m2ua_msg *m2ua;
	struct mtp_link_set *out_set;
	uint8_t buf[4096];

	bsc = fd->data;

	int rc = read(fd->fd, buf, sizeof(buf));
	if (rc <= 0) {
		LOGP(DINP, LOGL_ERROR, "Failed to read from the console.\n");
		return -1;
	}

	if (!bsc->allow_inject) {
		LOGP(DINP, LOGL_ERROR, "Injecting messages is not allowed.\n");
		return -1;
	}

	m2ua = m2ua_from_msg(rc, buf);
	if (!m2ua) {
		LOGP(DINP, LOGL_ERROR, "Failed to parse M2UA.\n");
		return -1;
	}

	if (m2ua->hdr.msg_class == M2UA_CLS_MAUP && m2ua->hdr.msg_type == M2UA_MAUP_DATA) {
		data = m2ua_msg_find_tag(m2ua, M2UA_TAG_DATA);
		if (!data) {
			LOGP(DINP, LOGL_ERROR, "MAUP Data without data.\n");
			goto exit;
		}

		if (data->len > 2048) {
			LOGP(DINP, LOGL_ERROR, "Data is too big for this configuration.\n");
			goto exit;
		}

		link = m2ua_msg_find_tag(m2ua, MUA_TAG_IDENT_TEXT);
		if (!link) {
			LOGP(DINP, LOGL_ERROR, "Interface Identifier Text is mandantory.\n");
			goto exit;
		}

		if (link->len > 255) {
			LOGP(DINP, LOGL_ERROR, "Spec violation. Ident text should be shorter than 255.\n");
			goto exit;
		}

		out_set = find_link_set(bsc, link->len, (const char *) link->dat);
		if (!out_set) {
			LOGP(DINP, LOGL_ERROR, "Identified linkset does not exist.\n");
			goto exit;
		}

		msg = msgb_alloc(2048, "inject-data");
		if (!msg) {
			LOGP(DINP, LOGL_ERROR, "Failed to allocate storage.\n");
			goto exit;
		}

		msg->l2h = msgb_put(msg, data->len);
		memcpy(msg->l2h, data->dat, data->len);

		/* we are diretcly going to the output. no checking of anything  */
		if (mtp_link_set_send(out_set, msg) != 0) {
			LOGP(DINP, LOGL_ERROR, "Failed to send message.\n");
			msgb_free(msg);
		}
	}

exit:
	m2ua_msg_free(m2ua);
	return 0;
}

static int inject_init(struct bsc_data *bsc)
{
	int fd;
	struct sockaddr_in addr;

	fd = socket(PF_INET, SOCK_DGRAM, 0);
	if (fd < 0)
		return -1;

	memset(&addr, 0, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_port = htons(5001);

	if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) != 0) {
		LOGP(DINP, LOGL_ERROR, "Failed to bind to port 5001.\n");
		close(fd);
		return -1;
	}

	bsc->inject_fd.fd = fd;
	bsc->inject_fd.when = BSC_FD_READ;
	bsc->inject_fd.cb = inject_read_cb;
	bsc->inject_fd.data = bsc;

	if (bsc_register_fd(&bsc->inject_fd) != 0) {
		LOGP(DINP, LOGL_ERROR, "Failed to register.\n");
		close(fd);
		return -1;
	}

	return 0;
}

int main(int argc, char **argv)
{
	int rc;
	struct mtp_link_set *set;
	struct mtp_link_set *m2ua_set;
	struct mtp_m2ua_link *lnk;
	struct ss7_application *app;

	thread_init();

	log_init(&log_info);
	stderr_target = log_target_create_stderr();
	log_add_target(stderr_target);

	/* enable filters */
	log_set_all_filter(stderr_target, 1);
	log_set_category_filter(stderr_target, DINP, 1, LOGL_INFO);
	log_set_category_filter(stderr_target, DSCCP, 1, LOGL_INFO);
	log_set_category_filter(stderr_target, DMSC, 1, LOGL_INFO);
	log_set_category_filter(stderr_target, DMGCP, 1, LOGL_INFO);
	log_set_print_timestamp(stderr_target, 1);
	log_set_use_color(stderr_target, 0);

	sccp_set_log_area(DSCCP);
	m2ua_set_log_area(DM2UA);

	bsc = bsc_data_create();
	if (!bsc)
		return -1;
	bsc->app = APP_STP;

	handle_options(argc, argv);

	signal(SIGPIPE, SIG_IGN);
	signal(SIGINT, sigint);
	srand(time(NULL));

	cell_vty_init();
	if (vty_read_config_file(config, NULL) < 0) {
		fprintf(stderr, "Failed to read the VTY config.\n");
		return -1;
	}

	rc = telnet_init(NULL, NULL, 4242);
	if (rc < 0)
		return rc;

	if (inject_init(bsc) != 0) {
		LOGP(DINP, LOGL_NOTICE, "Failed to initialize inject interface.\n");
		return -1;
	}

	app = ss7_application_alloc(bsc);
	if (!app)
		return -1;

	set = link_init(bsc);
	if (!set)
		return -1;

	bsc->m2ua_trans = sctp_m2ua_transp_create("0.0.0.0", 2904);
	if (!bsc->m2ua_trans) {
		LOGP(DINP, LOGL_ERROR, "Failed to create SCTP transport.\n");
		return -1;
	}

	m2ua_set = mtp_link_set_alloc(bsc);
	m2ua_set->dpc = 92;
	m2ua_set->opc = 9;
	m2ua_set->sccp_opc = 9;
	m2ua_set->isup_opc = 9;
	m2ua_set->ni = 3;
	m2ua_set->bsc = bsc;
	m2ua_set->pcap_fd = bsc->pcap_fd;
	m2ua_set->name = talloc_strdup(m2ua_set, "M2UA");

	/* setup things */
	set->pass_all_isup = bsc->isup_pass;
	m2ua_set->pass_all_isup = bsc->isup_pass;

	lnk = mtp_m2ua_link_create(m2ua_set);
	lnk->base.pcap_fd = -1;
	mtp_link_set_add_link(m2ua_set, (struct mtp_link *) lnk);

	ss7_application_setup(app, APP_STP,
			      SS7_SET_LINKSET, 0,
			      SS7_SET_LINKSET, 1);

	ss7_application_start(app);

        while (1) {
		bsc_select_main(0);
        }

	return 0;
}

/* dummy for links */
int msc_connection_start(struct msc_connection *conn)
{
	return 0;
}

struct msc_connection *msc_connection_num(struct bsc_data *bsc, int num)
{
	return NULL;
}


void msc_mgcp_reset(struct msc_connection *msc)
{
}
void msc_send_reset(struct msc_connection *bsc)
{
}
void app_resources_released(struct ss7_application *ss7)
{
}
void app_clear_connections(struct ss7_application *ss7)
{
}
void app_forward_sccp(struct ss7_application *ss7, struct msgb *_msg, int sls)
{
}