Only emit different ip family warnings if the ip wasn't automatically resolved
[project/firewall3.git] / main.c
1 /*
2  * firewall3 - 3rd OpenWrt UCI firewall implementation
3  *
4  *   Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
5  *
6  * Permission to use, copy, modify, and/or distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18
19 #include <stdio.h>
20 #include <unistd.h>
21
22 #include "options.h"
23 #include "defaults.h"
24 #include "zones.h"
25 #include "rules.h"
26 #include "redirects.h"
27 #include "forwards.h"
28 #include "ipsets.h"
29 #include "includes.h"
30 #include "ubus.h"
31 #include "iptables.h"
32
33
34 static enum fw3_family print_family = FW3_FAMILY_ANY;
35
36 static struct fw3_state *run_state = NULL;
37 static struct fw3_state *cfg_state = NULL;
38
39
40 static bool
41 build_state(bool runtime)
42 {
43         struct fw3_state *state = NULL;
44         struct uci_package *p = NULL;
45         FILE *sf;
46
47         state = malloc(sizeof(*state));
48
49         if (!state)
50                 error("Out of memory");
51
52         memset(state, 0, sizeof(*state));
53         state->uci = uci_alloc_context();
54
55         if (!state->uci)
56                 error("Out of memory");
57
58         if (runtime)
59         {
60                 sf = fopen(FW3_STATEFILE, "r");
61
62                 if (sf)
63                 {
64                         uci_import(state->uci, sf, "fw3_state", &p, true);
65                         fclose(sf);
66                 }
67
68                 if (!p)
69                 {
70                         uci_free_context(state->uci);
71                         free(state);
72
73                         return false;
74                 }
75
76                 state->statefile = true;
77
78                 run_state = state;
79         }
80         else
81         {
82                 if (!fw3_ubus_connect())
83                         error("Failed to connect to ubus");
84
85                 if (uci_load(state->uci, "firewall", &p))
86                 {
87                         uci_perror(state->uci, NULL);
88                         error("Failed to load /etc/config/firewall");
89                 }
90
91                 if (!fw3_find_command("ipset"))
92                 {
93                         warn("Unable to locate ipset utility, disabling ipset support");
94                         state->disable_ipsets = true;
95                 }
96
97                 cfg_state = state;
98         }
99
100         fw3_load_defaults(state, p);
101         fw3_load_ipsets(state, p);
102         fw3_load_zones(state, p);
103         fw3_load_rules(state, p);
104         fw3_load_redirects(state, p);
105         fw3_load_forwards(state, p);
106         fw3_load_includes(state, p);
107
108         return true;
109 }
110
111 static void
112 free_state(struct fw3_state *state)
113 {
114         struct list_head *cur, *tmp;
115
116         list_for_each_safe(cur, tmp, &state->zones)
117                 fw3_free_zone((struct fw3_zone *)cur);
118
119         list_for_each_safe(cur, tmp, &state->rules)
120                 fw3_free_rule((struct fw3_rule *)cur);
121
122         list_for_each_safe(cur, tmp, &state->redirects)
123                 fw3_free_redirect((struct fw3_redirect *)cur);
124
125         list_for_each_safe(cur, tmp, &state->forwards)
126                 fw3_free_forward((struct fw3_forward *)cur);
127
128         list_for_each_safe(cur, tmp, &state->ipsets)
129                 fw3_free_ipset((struct fw3_ipset *)cur);
130
131         list_for_each_safe(cur, tmp, &state->includes)
132                 fw3_free_include((struct fw3_include *)cur);
133
134         uci_free_context(state->uci);
135
136         free(state);
137
138         fw3_ubus_disconnect();
139 }
140
141
142 static bool
143 family_running(enum fw3_family family)
144 {
145         return (run_state && has(run_state->defaults.flags, family, family));
146 }
147
148 static void
149 family_set(struct fw3_state *state, enum fw3_family family, bool set)
150 {
151         if (!state)
152                 return;
153
154         if (set)
155                 set(state->defaults.flags, family, family);
156         else
157                 del(state->defaults.flags, family, family);
158 }
159
160 static int
161 stop(bool complete)
162 {
163         FILE *ct;
164
165         int rv = 1;
166         enum fw3_family family;
167         enum fw3_table table;
168         struct fw3_ipt_handle *handle;
169
170         if (!complete && !run_state)
171         {
172                 warn("The firewall appears to be stopped. "
173                          "Use the 'flush' command to forcefully purge all rules.");
174
175                 return rv;
176         }
177
178         if (!print_family && run_state)
179                 fw3_hotplug_zones(run_state, false);
180
181         for (family = FW3_FAMILY_V4; family <= FW3_FAMILY_V6; family++)
182         {
183                 if (!complete && !family_running(family))
184                         continue;
185
186                 for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
187                 {
188                         if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
189                                 continue;
190
191                         if (!(handle = fw3_ipt_open(family, table)))
192                                 continue;
193
194                         info(" * %sing %s %s table", complete ? "Flush" : "Clear",
195                              fw3_flag_names[family], fw3_flag_names[table]);
196
197                         if (complete)
198                         {
199                                 fw3_flush_all(handle);
200                         }
201                         else if (run_state)
202                         {
203                                 fw3_flush_rules(handle, run_state, false);
204                                 fw3_flush_zones(handle, run_state, false);
205                         }
206
207                         fw3_ipt_commit(handle);
208                 }
209
210                 family_set(run_state, family, false);
211                 family_set(cfg_state, family, false);
212
213                 rv = 0;
214         }
215
216         if (run_state)
217                 fw3_destroy_ipsets(run_state);
218
219         if (complete && (ct = fopen("/proc/net/nf_conntrack", "w")) != NULL)
220         {
221                 info(" * Flushing conntrack table ...");
222
223                 fwrite("f\n", 2, 1, ct);
224                 fclose(ct);
225         }
226
227         if (!rv && run_state)
228                 fw3_write_statefile(run_state);
229
230         return rv;
231 }
232
233 static int
234 start(void)
235 {
236         int rv = 1;
237         enum fw3_family family;
238         enum fw3_table table;
239         struct fw3_ipt_handle *handle;
240
241         if (!print_family)
242                 fw3_create_ipsets(cfg_state);
243
244         for (family = FW3_FAMILY_V4; family <= FW3_FAMILY_V6; family++)
245         {
246                 if (family == FW3_FAMILY_V6 && cfg_state->defaults.disable_ipv6)
247                         continue;
248
249                 if (print_family && family != print_family)
250                         continue;
251
252                 if (!print_family && family_running(family))
253                 {
254                         warn("The %s firewall appears to be started already. "
255                              "If it is indeed empty, remove the %s file and retry.",
256                              fw3_flag_names[family], FW3_STATEFILE);
257
258                         continue;
259                 }
260
261                 for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
262                 {
263                         if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
264                                 continue;
265
266                         if (!(handle = fw3_ipt_open(family, table)))
267                                 continue;
268
269                         info(" * Populating %s %s table",
270                              fw3_flag_names[family], fw3_flag_names[table]);
271
272                         fw3_print_default_chains(handle, cfg_state, false);
273                         fw3_print_zone_chains(handle, cfg_state, false);
274                         fw3_print_default_head_rules(handle, cfg_state, false);
275                         fw3_print_rules(handle, cfg_state);
276                         fw3_print_redirects(handle, cfg_state);
277                         fw3_print_forwards(handle, cfg_state);
278                         fw3_print_zone_rules(handle, cfg_state, false);
279                         fw3_print_default_tail_rules(handle, cfg_state, false);
280
281                         if (!print_family)
282                                 fw3_ipt_commit(handle);
283                 }
284
285                 if (!print_family)
286                         fw3_print_includes(cfg_state, family, false);
287
288                 family_set(run_state, family, true);
289                 family_set(cfg_state, family, true);
290
291                 rv = 0;
292         }
293
294         if (!rv)
295         {
296                 fw3_set_defaults(cfg_state);
297
298                 if (!print_family)
299                 {
300                         fw3_run_includes(cfg_state, false);
301                         fw3_hotplug_zones(cfg_state, true);
302                         fw3_write_statefile(cfg_state);
303                 }
304         }
305
306         return rv;
307 }
308
309
310 static int
311 reload(void)
312 {
313         int rv = 1;
314         enum fw3_family family;
315         enum fw3_table table;
316         struct fw3_ipt_handle *handle;
317
318         if (!run_state)
319                 return start();
320
321         fw3_hotplug_zones(run_state, false);
322
323         for (family = FW3_FAMILY_V4; family <= FW3_FAMILY_V6; family++)
324         {
325                 if (!family_running(family))
326                         goto start;
327
328                 for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
329                 {
330                         if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
331                                 continue;
332
333                         if (!(handle = fw3_ipt_open(family, table)))
334                                 continue;
335
336                         info(" * Clearing %s %s table",
337                              fw3_flag_names[family], fw3_flag_names[table]);
338
339                         fw3_flush_rules(handle, run_state, true);
340                         fw3_flush_zones(handle, run_state, true);
341                         fw3_ipt_commit(handle);
342                 }
343
344                 family_set(run_state, family, false);
345                 family_set(cfg_state, family, false);
346
347 start:
348                 if (family == FW3_FAMILY_V6 && cfg_state->defaults.disable_ipv6)
349                         continue;
350
351                 for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
352                 {
353                         if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
354                                 continue;
355
356                         if (!(handle = fw3_ipt_open(family, table)))
357                                 continue;
358
359                         info(" * Populating %s %s table",
360                              fw3_flag_names[family], fw3_flag_names[table]);
361
362                         fw3_print_default_chains(handle, cfg_state, true);
363                         fw3_print_zone_chains(handle, cfg_state, true);
364                         fw3_print_default_head_rules(handle, cfg_state, true);
365                         fw3_print_rules(handle, cfg_state);
366                         fw3_print_redirects(handle, cfg_state);
367                         fw3_print_forwards(handle, cfg_state);
368                         fw3_print_zone_rules(handle, cfg_state, true);
369                         fw3_print_default_tail_rules(handle, cfg_state, true);
370
371                         fw3_ipt_commit(handle);
372                 }
373
374                 fw3_print_includes(cfg_state, family, true);
375
376                 family_set(run_state, family, true);
377                 family_set(cfg_state, family, true);
378
379                 rv = 0;
380         }
381
382         if (!rv)
383         {
384                 fw3_set_defaults(cfg_state);
385                 fw3_run_includes(cfg_state, true);
386                 fw3_hotplug_zones(cfg_state, true);
387                 fw3_write_statefile(cfg_state);
388         }
389
390         return rv;
391 }
392
393 static int
394 lookup_network(const char *net)
395 {
396         struct fw3_zone *z;
397         struct fw3_device *d;
398
399         list_for_each_entry(z, &cfg_state->zones, list)
400         {
401                 list_for_each_entry(d, &z->networks, list)
402                 {
403                         if (!strcmp(d->name, net))
404                         {
405                                 printf("%s\n", z->name);
406                                 return 0;
407                         }
408                 }
409         }
410
411         return 1;
412 }
413
414 static int
415 lookup_device(const char *dev)
416 {
417         struct fw3_zone *z;
418         struct fw3_device *d;
419
420         list_for_each_entry(z, &cfg_state->zones, list)
421         {
422                 list_for_each_entry(d, &z->devices, list)
423                 {
424                         if (!strcmp(d->name, dev))
425                         {
426                                 printf("%s\n", z->name);
427                                 return 0;
428                         }
429                 }
430         }
431
432         return 1;
433 }
434
435 static int
436 usage(void)
437 {
438         fprintf(stderr, "fw3 [-4] [-6] [-q] print\n");
439         fprintf(stderr, "fw3 [-q] {start|stop|flush|reload|restart}\n");
440         fprintf(stderr, "fw3 [-q] network {net}\n");
441         fprintf(stderr, "fw3 [-q] device {dev}\n");
442
443         return 1;
444 }
445
446
447 int main(int argc, char **argv)
448 {
449         int ch, rv = 1;
450         enum fw3_family family = FW3_FAMILY_ANY;
451         struct fw3_defaults *defs = NULL;
452
453         while ((ch = getopt(argc, argv, "46dqh")) != -1)
454         {
455                 switch (ch)
456                 {
457                 case '4':
458                         family = FW3_FAMILY_V4;
459                         break;
460
461                 case '6':
462                         family = FW3_FAMILY_V6;
463                         break;
464
465                 case 'd':
466                         fw3_pr_debug = true;
467                         break;
468
469                 case 'q':
470                         freopen("/dev/null", "w", stderr);
471                         break;
472
473                 case 'h':
474                         rv = usage();
475                         goto out;
476                 }
477         }
478
479         build_state(false);
480         build_state(true);
481         defs = &cfg_state->defaults;
482
483         if (optind >= argc)
484         {
485                 rv = usage();
486                 goto out;
487         }
488
489         if (!strcmp(argv[optind], "print"))
490         {
491                 if (family == FW3_FAMILY_ANY)
492                         family = FW3_FAMILY_V4;
493                 else if (family == FW3_FAMILY_V6 && defs->disable_ipv6)
494                         warn("IPv6 rules globally disabled in configuration");
495
496                 freopen("/dev/null", "w", stderr);
497
498                 cfg_state->disable_ipsets = true;
499                 print_family = family;
500                 fw3_pr_debug = true;
501
502                 rv = start();
503         }
504         else if (!strcmp(argv[optind], "start"))
505         {
506                 if (fw3_lock())
507                 {
508                         rv = start();
509                         fw3_unlock();
510                 }
511         }
512         else if (!strcmp(argv[optind], "stop"))
513         {
514                 if (fw3_lock())
515                 {
516                         rv = stop(false);
517                         fw3_unlock();
518                 }
519         }
520         else if (!strcmp(argv[optind], "flush"))
521         {
522                 if (fw3_lock())
523                 {
524                         rv = stop(true);
525                         fw3_unlock();
526                 }
527         }
528         else if (!strcmp(argv[optind], "restart"))
529         {
530                 if (fw3_lock())
531                 {
532                         stop(true);
533                         rv = start();
534                         fw3_unlock();
535                 }
536         }
537         else if (!strcmp(argv[optind], "reload"))
538         {
539                 if (fw3_lock())
540                 {
541                         rv = reload();
542                         fw3_unlock();
543                 }
544         }
545         else if (!strcmp(argv[optind], "network") && (optind + 1) < argc)
546         {
547                 rv = lookup_network(argv[optind + 1]);
548         }
549         else if (!strcmp(argv[optind], "device") && (optind + 1) < argc)
550         {
551                 rv = lookup_device(argv[optind + 1]);
552         }
553         else
554         {
555                 rv = usage();
556         }
557
558 out:
559         if (cfg_state)
560                 free_state(cfg_state);
561
562         if (run_state)
563                 free_state(run_state);
564
565         return rv;
566 }