summaryrefslogtreecommitdiffstats
path: root/src/read_config_yy.y
blob: 1668919db8acc3bde26c2f5f640510d44224628a (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
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
%{
/*
 * (C) 2006 by Pablo Neira Ayuso <pablo@netfilter.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 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.
 *
 * Description: configuration file abstract grammar
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "conntrackd.h"
#include "ignore.h"

extern char *yytext;
extern int   yylineno;

struct ct_conf conf;
%}

%union {
	int		val;
	char		*string;
}

%token T_IPV4_ADDR T_IPV4_IFACE T_PORT T_HASHSIZE T_HASHLIMIT T_MULTICAST
%token T_PATH T_UNIX T_REFRESH T_IPV6_ADDR T_IPV6_IFACE
%token T_IGNORE_UDP T_IGNORE_ICMP T_IGNORE_TRAFFIC T_BACKLOG T_GROUP
%token T_LOG T_UDP T_ICMP T_IGMP T_VRRP T_TCP T_IGNORE_PROTOCOL
%token T_LOCK T_STRIP_NAT T_BUFFER_SIZE_MAX_GROWN T_EXPIRE T_TIMEOUT
%token T_GENERAL T_SYNC T_STATS T_RELAX_TRANSITIONS T_BUFFER_SIZE T_DELAY
%token T_SYNC_MODE T_LISTEN_TO T_FAMILY T_RESEND_BUFFER_SIZE
%token T_PERSISTENT T_NACK T_CHECKSUM T_WINDOWSIZE T_ON T_OFF
%token T_REPLICATE T_FOR 
%token T_ESTABLISHED T_SYN_SENT T_SYN_RECV T_FIN_WAIT 
%token T_CLOSE_WAIT T_LAST_ACK T_TIME_WAIT T_CLOSE T_LISTEN


%token <string> T_IP T_PATH_VAL
%token <val> T_NUMBER
%token <string> T_STRING

%%

configfile :
	   | lines
	   ;

lines : line
      | lines line
      ;

line : ignore_protocol
     | ignore_traffic
     | strip_nat
     | general
     | sync
     | stats
     ;

log : T_LOG T_PATH_VAL
{
	strncpy(conf.logfile, $2, FILENAME_MAXLEN);
};

lock : T_LOCK T_PATH_VAL
{
	strncpy(conf.lockfile, $2, FILENAME_MAXLEN);
};

strip_nat: T_STRIP_NAT
{
	conf.flags |= STRIP_NAT;
};

refreshtime : T_REFRESH T_NUMBER
{
	conf.refresh = $2;
};

expiretime: T_EXPIRE T_NUMBER
{
	conf.cache_timeout = $2;
};

timeout: T_TIMEOUT T_NUMBER
{
	conf.commit_timeout = $2;
};

checksum: T_CHECKSUM T_ON 
{
};

checksum: T_CHECKSUM T_OFF
{
	conf.flags |= DONT_CHECKSUM;
};

ignore_traffic : T_IGNORE_TRAFFIC '{' ignore_traffic_options '}';

ignore_traffic_options :
		       | ignore_traffic_options ignore_traffic_option;

ignore_traffic_option : T_IPV4_ADDR T_IP
{
	union inet_address ip;
	int family = 0;

	memset(&ip, 0, sizeof(union inet_address));

	if (inet_aton($2, &ip.ipv4))
		family = AF_INET;
#ifdef HAVE_INET_PTON_IPV6
	else if (inet_pton(AF_INET6, $2, &ip.ipv6) > 0)
		family = AF_INET6;
#endif

	if (!family) {
		fprintf(stdout, "%s is not a valid IP, ignoring", $2);
		return;
	}

	if (!STATE(ignore_pool)) {
		STATE(ignore_pool) = ignore_pool_create(family);
		if (!STATE(ignore_pool)) {
			fprintf(stdout, "Can't create ignore pool!\n");
			exit(EXIT_FAILURE);
		}
	}

	if (!ignore_pool_add(STATE(ignore_pool), &ip)) {
		if (errno == EEXIST)
			fprintf(stdout, "IP %s is repeated "
					"in the ignore pool\n", $2);
		if (errno == ENOSPC)
			fprintf(stdout, "Too many IP in the ignore pool!\n");
	}
};

multicast_line : T_MULTICAST '{' multicast_options '}';

multicast_options :
		  | multicast_options multicast_option;

multicast_option : T_IPV4_ADDR T_IP
{
	if (!inet_aton($2, &conf.mcast.in)) {
		fprintf(stderr, "%s is not a valid IPv4 address\n");
		return;
	}

        if (conf.mcast.ipproto == AF_INET6) {
		fprintf(stderr, "Your multicast address is IPv4 but "
		                "is binded to an IPv6 interface? Surely "
				"this is not what you want\n");
		return;
	}

	conf.mcast.ipproto = AF_INET;
};

multicast_option : T_IPV6_ADDR T_IP
{
#ifdef HAVE_INET_PTON_IPV6
	if (inet_pton(AF_INET6, $2, &conf.mcast.in) <= 0)
		fprintf(stderr, "%s is not a valid IPv6 address\n", $2);
#endif

	if (conf.mcast.ipproto == AF_INET) {
		fprintf(stderr, "Your multicast address is IPv6 but "
				"is binded to an IPv4 interface? Surely "
				"this is not what you want\n");
		return;
	}

	conf.mcast.ipproto = AF_INET6;
};

multicast_option : T_IPV4_IFACE T_IP
{
	if (!inet_aton($2, &conf.mcast.ifa)) {
		fprintf(stderr, "%s is not a valid IPv4 address\n");
		return;
	}

        if (conf.mcast.ipproto == AF_INET6) {
		fprintf(stderr, "Your multicast interface is IPv4 but "
		                "is binded to an IPv6 interface? Surely "
				"this is not what you want\n");
		return;
	}

	conf.mcast.ipproto = AF_INET;
};

multicast_option : T_IPV6_IFACE T_IP
{
#ifdef HAVE_INET_PTON_IPV6
	if (inet_pton(AF_INET6, $2, &conf.mcast.ifa) <= 0)
		fprintf(stderr, "%s is not a valid IPv6 address\n", $2);
#endif

	if (conf.mcast.ipproto == AF_INET) {
		fprintf(stderr, "Your multicast interface is IPv6 but "
				"is binded to an IPv4 interface? Surely "
				"this is not what you want\n");
		return;
	}

	conf.mcast.ipproto = AF_INET6;
};

multicast_option : T_BACKLOG T_NUMBER
{
	conf.mcast.backlog = $2;
};

multicast_option : T_GROUP T_NUMBER
{
	conf.mcast.port = $2;
};

hashsize : T_HASHSIZE T_NUMBER
{
	conf.hashsize = $2;
};

hashlimit: T_HASHLIMIT T_NUMBER
{
	conf.limit = $2;
};

unix_line: T_UNIX '{' unix_options '}';

unix_options:
	    | unix_options unix_option
	    ;

unix_option : T_PATH T_PATH_VAL
{
	strcpy(conf.local.path, $2);
};

unix_option : T_BACKLOG T_NUMBER
{
	conf.local.backlog = $2;
};

ignore_protocol: T_IGNORE_PROTOCOL '{' ignore_proto_list '}';

ignore_proto_list:
		 | ignore_proto_list ignore_proto
		 ;

ignore_proto: T_NUMBER
{
	if ($1 < IPPROTO_MAX)
		conf.ignore_protocol[$1] = 1;
	else
		fprintf(stdout, "Protocol number `%d' is freak\n", $1);
};

ignore_proto: T_UDP
{
	conf.ignore_protocol[IPPROTO_UDP] = 1;
};

ignore_proto: T_ICMP
{
	conf.ignore_protocol[IPPROTO_ICMP] = 1;
};

ignore_proto: T_VRRP
{
	conf.ignore_protocol[IPPROTO_VRRP] = 1;
};

ignore_proto: T_IGMP
{
	conf.ignore_protocol[IPPROTO_IGMP] = 1;
};

sync: T_SYNC '{' sync_list '}';

sync_list:
	 | sync_list sync_line;

sync_line: refreshtime
	 | expiretime
	 | timeout
	 | checksum
	 | multicast_line
	 | relax_transitions
	 | delay_destroy_msgs
	 | sync_mode_persistent
	 | sync_mode_nack
	 | listen_to
	 | state_replication
	 ;

sync_mode_persistent: T_SYNC_MODE T_PERSISTENT '{' sync_mode_persistent_list '}'
{
	conf.flags |= SYNC_MODE_PERSISTENT;
};

sync_mode_nack: T_SYNC_MODE T_NACK '{' sync_mode_nack_list '}'
{
	conf.flags |= SYNC_MODE_NACK;
};

sync_mode_persistent_list:
	      | sync_mode_persistent_list sync_mode_persistent_line;

sync_mode_persistent_line: refreshtime
              		 | expiretime
	     		 | timeout
			 | relax_transitions
			 | delay_destroy_msgs
			 ;

sync_mode_nack_list:
	      | sync_mode_nack_list sync_mode_nack_line;

sync_mode_nack_line: resend_buffer_size
		   | timeout
		   | window_size
		   ;

resend_buffer_size: T_RESEND_BUFFER_SIZE T_NUMBER
{
	conf.resend_buffer_size = $2;
};

window_size: T_WINDOWSIZE T_NUMBER
{
	conf.window_size = $2;
};

relax_transitions: T_RELAX_TRANSITIONS
{
	conf.flags |= RELAX_TRANSITIONS;
};

delay_destroy_msgs: T_DELAY
{
	conf.flags |= DELAY_DESTROY_MSG;
};

listen_to: T_LISTEN_TO T_IP
{
	union inet_address addr;

#ifdef HAVE_INET_PTON_IPV6
	if (inet_pton(AF_INET6, $2, &addr.ipv6) <= 0)
#endif
		if (inet_aton($2, &addr.ipv4) <= 0) {
			fprintf(stderr, "%s is not a valid IP address\n", $2);
			exit(EXIT_FAILURE);
		}

	if (CONFIG(listen_to_len) == 0 || CONFIG(listen_to_len) % 16) {
		CONFIG(listen_to) = realloc(CONFIG(listen_to),
					    sizeof(union inet_address) *
					    (CONFIG(listen_to_len) + 16));
		if (CONFIG(listen_to) == NULL) {
			fprintf(stderr, "cannot init listen_to array\n");
			exit(EXIT_FAILURE);
		}

		memset(CONFIG(listen_to) + 
		       (CONFIG(listen_to_len) * sizeof(union inet_address)),
		       0, sizeof(union inet_address) * 16);

	}
};

state_replication: T_REPLICATE states T_FOR state_proto;

states:
      | states state;

state_proto: T_TCP;
state: tcp_state;

tcp_state: T_SYN_SENT
{
	extern struct state_replication_helper tcp_state_helper;
	state_helper_register(&tcp_state_helper, TCP_CONNTRACK_SYN_SENT);
};
tcp_state: T_SYN_RECV
{
	extern struct state_replication_helper tcp_state_helper;
	state_helper_register(&tcp_state_helper, TCP_CONNTRACK_SYN_RECV);
};
tcp_state: T_ESTABLISHED
{
	extern struct state_replication_helper tcp_state_helper;
	state_helper_register(&tcp_state_helper, TCP_CONNTRACK_ESTABLISHED);
};
tcp_state: T_FIN_WAIT
{
	extern struct state_replication_helper tcp_state_helper;
	state_helper_register(&tcp_state_helper, TCP_CONNTRACK_FIN_WAIT);
};
tcp_state: T_CLOSE_WAIT
{
	extern struct state_replication_helper tcp_state_helper;
	state_helper_register(&tcp_state_helper, TCP_CONNTRACK_CLOSE_WAIT);
};
tcp_state: T_LAST_ACK
{
	extern struct state_replication_helper tcp_state_helper;
	state_helper_register(&tcp_state_helper, TCP_CONNTRACK_LAST_ACK);
};
tcp_state: T_TIME_WAIT
{
	extern struct state_replication_helper tcp_state_helper;
	state_helper_register(&tcp_state_helper, TCP_CONNTRACK_TIME_WAIT);
};
tcp_state: T_CLOSE
{
	extern struct state_replication_helper tcp_state_helper;
	state_helper_register(&tcp_state_helper, TCP_CONNTRACK_CLOSE);
};
tcp_state: T_LISTEN
{
	extern struct state_replication_helper tcp_state_helper;
	state_helper_register(&tcp_state_helper, TCP_CONNTRACK_LISTEN);
};

general: T_GENERAL '{' general_list '}';

general_list:
	    | general_list general_line
	    ;

general_line: hashsize
	    | hashlimit
	    | log
	    | lock
	    | unix_line
	    | netlink_buffer_size
	    | netlink_buffer_size_max_grown
	    | family
	    ;

netlink_buffer_size: T_BUFFER_SIZE T_NUMBER
{
	conf.netlink_buffer_size = $2;
};

netlink_buffer_size_max_grown : T_BUFFER_SIZE_MAX_GROWN T_NUMBER
{
	conf.netlink_buffer_size_max_grown = $2;
};

family : T_FAMILY T_STRING
{
	if (strncmp($2, "IPv6", strlen("IPv6")) == 0)
		conf.family = AF_INET6;
	else
		conf.family = AF_INET;
};

stats: T_SYNC '{' stats_list '}';

stats_list:
	 | stats_list stat_line
	 ;

stat_line:
	 |
	 ;

%%

int
yyerror(char *msg)
{
	printf("Error parsing config file: ");
	printf("line (%d), symbol '%s': %s\n", yylineno, yytext, msg);
	exit(EXIT_FAILURE);
}

int
init_config(char *filename)
{
	FILE *fp;

	fp = fopen(filename, "r");
	if (!fp)
		return -1;

	yyrestart(fp);
	yyparse();
	fclose(fp);

	/* default to IPv4 */
	if (CONFIG(family) == 0)
		CONFIG(family) = AF_INET;

	/* set to default is not specified */
	if (strcmp(CONFIG(lockfile), "") == 0)
		strncpy(CONFIG(lockfile), DEFAULT_LOCKFILE, FILENAME_MAXLEN);

	/* default to 180 seconds of expiration time: cache entries */
	if (CONFIG(cache_timeout) == 0)
		CONFIG(cache_timeout) = 180;

	/* default to 180 seconds: committed entries */
	if (CONFIG(commit_timeout) == 0)
		CONFIG(commit_timeout) = 180;

	/* default to 60 seconds of refresh time */
	if (CONFIG(refresh) == 0)
		CONFIG(refresh) = 60;

	if (CONFIG(resend_buffer_size) == 0)
		CONFIG(resend_buffer_size) = 262144;

	/* create empty pool */
	if (!STATE(ignore_pool)) {
		STATE(ignore_pool) = ignore_pool_create(CONFIG(family));
		if (!STATE(ignore_pool)) {
			fprintf(stdout, "Can't create ignore pool!\n");
			exit(EXIT_FAILURE);
		}
	}

	/* default to a window size of 20 packets */
	if (CONFIG(window_size) == 0)
		CONFIG(window_size) = 20;

	return 0;
}