Also add comments for unnamed rules
[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         {
218                 if (fw3_command_pipe(false, "ipset", "-exist", "-"))
219                 {
220                         fw3_destroy_ipsets(run_state);
221                         fw3_command_close();
222                 }
223         }
224
225         if (complete && (ct = fopen("/proc/net/nf_conntrack", "w")) != NULL)
226         {
227                 info(" * Flushing conntrack table ...");
228
229                 fwrite("f\n", 2, 1, ct);
230                 fclose(ct);
231         }
232
233         if (!rv && run_state)
234                 fw3_write_statefile(run_state);
235
236         return rv;
237 }
238
239 static int
240 start(void)
241 {
242         int rv = 1;
243         enum fw3_family family;
244         enum fw3_table table;
245         struct fw3_ipt_handle *handle;
246
247         if (!print_family)
248         {
249                 if (fw3_command_pipe(false, "ipset", "-exist", "-"))
250                 {
251                         fw3_create_ipsets(cfg_state);
252                         fw3_command_close();
253                 }
254         }
255
256         for (family = FW3_FAMILY_V4; family <= FW3_FAMILY_V6; family++)
257         {
258                 if (family == FW3_FAMILY_V6 && cfg_state->defaults.disable_ipv6)
259                         continue;
260
261                 if (print_family && family != print_family)
262                         continue;
263
264                 if (!print_family && family_running(family))
265                 {
266                         warn("The %s firewall appears to be started already. "
267                              "If it is indeed empty, remove the %s file and retry.",
268                              fw3_flag_names[family], FW3_STATEFILE);
269
270                         continue;
271                 }
272
273                 for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
274                 {
275                         if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
276                                 continue;
277
278                         if (!(handle = fw3_ipt_open(family, table)))
279                                 continue;
280
281                         info(" * Populating %s %s table",
282                              fw3_flag_names[family], fw3_flag_names[table]);
283
284                         fw3_print_default_chains(handle, cfg_state, false);
285                         fw3_print_zone_chains(handle, cfg_state, false);
286                         fw3_print_default_head_rules(handle, cfg_state, false);
287                         fw3_print_rules(handle, cfg_state);
288                         fw3_print_redirects(handle, cfg_state);
289                         fw3_print_forwards(handle, cfg_state);
290                         fw3_print_zone_rules(handle, cfg_state, false);
291                         fw3_print_default_tail_rules(handle, cfg_state, false);
292
293                         if (!print_family)
294                                 fw3_ipt_commit(handle);
295                 }
296
297                 //fw3_print_includes(cfg_state, family, false);
298
299                 family_set(run_state, family, true);
300                 family_set(cfg_state, family, true);
301
302                 rv = 0;
303         }
304
305         if (!rv)
306         {
307                 fw3_set_defaults(cfg_state);
308
309                 if (!print_family)
310                 {
311                         fw3_run_includes(cfg_state, false);
312                         fw3_hotplug_zones(cfg_state, true);
313                         fw3_write_statefile(cfg_state);
314                 }
315         }
316
317         return rv;
318 }
319
320
321 static int
322 reload(void)
323 {
324         int rv = 1;
325         enum fw3_family family;
326         enum fw3_table table;
327         struct fw3_ipt_handle *handle;
328
329         if (!print_family && run_state)
330                 fw3_hotplug_zones(run_state, false);
331
332         for (family = FW3_FAMILY_V4; family <= FW3_FAMILY_V6; family++)
333         {
334                 if (!family_running(family))
335                         goto start;
336
337                 for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
338                 {
339                         if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
340                                 continue;
341
342                         if (!(handle = fw3_ipt_open(family, table)))
343                                 continue;
344
345                         info(" * Clearing %s %s table",
346                              fw3_flag_names[family], fw3_flag_names[table]);
347
348                         if (run_state)
349                         {
350                                 fw3_flush_rules(handle, run_state, true);
351                                 fw3_flush_zones(handle, run_state, true);
352                         }
353
354                         fw3_ipt_commit(handle);
355                 }
356
357                 family_set(run_state, family, false);
358                 family_set(cfg_state, family, false);
359
360 start:
361                 if (family == FW3_FAMILY_V6 && cfg_state->defaults.disable_ipv6)
362                         continue;
363
364                 for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
365                 {
366                         if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
367                                 continue;
368
369                         if (!(handle = fw3_ipt_open(family, table)))
370                                 continue;
371
372                         info(" * Populating %s %s table",
373                              fw3_flag_names[family], fw3_flag_names[table]);
374
375                         fw3_print_default_chains(handle, cfg_state, true);
376                         fw3_print_zone_chains(handle, cfg_state, true);
377                         fw3_print_default_head_rules(handle, cfg_state, true);
378                         fw3_print_rules(handle, cfg_state);
379                         fw3_print_redirects(handle, cfg_state);
380                         fw3_print_forwards(handle, cfg_state);
381                         fw3_print_zone_rules(handle, cfg_state, true);
382                         fw3_print_default_tail_rules(handle, cfg_state, true);
383
384                         fw3_ipt_commit(handle);
385                 }
386
387                 //fw3_print_includes(cfg_state, family, true);
388
389                 family_set(run_state, family, true);
390                 family_set(cfg_state, family, true);
391
392                 rv = 0;
393         }
394
395         if (!rv)
396         {
397                 fw3_set_defaults(cfg_state);
398
399                 if (!print_family)
400                 {
401                         fw3_run_includes(cfg_state, true);
402                         fw3_hotplug_zones(cfg_state, true);
403                         fw3_write_statefile(cfg_state);
404                 }
405         }
406
407         return rv;
408 }
409
410 static int
411 lookup_network(const char *net)
412 {
413         struct fw3_zone *z;
414         struct fw3_device *d;
415
416         list_for_each_entry(z, &cfg_state->zones, list)
417         {
418                 list_for_each_entry(d, &z->networks, list)
419                 {
420                         if (!strcmp(d->name, net))
421                         {
422                                 printf("%s\n", z->name);
423                                 return 0;
424                         }
425                 }
426         }
427
428         return 1;
429 }
430
431 static int
432 lookup_device(const char *dev)
433 {
434         struct fw3_zone *z;
435         struct fw3_device *d;
436
437         list_for_each_entry(z, &cfg_state->zones, list)
438         {
439                 list_for_each_entry(d, &z->devices, list)
440                 {
441                         if (!strcmp(d->name, dev))
442                         {
443                                 printf("%s\n", z->name);
444                                 return 0;
445                         }
446                 }
447         }
448
449         return 1;
450 }
451
452 static int
453 usage(void)
454 {
455         fprintf(stderr, "fw3 [-4] [-6] [-q] print\n");
456         fprintf(stderr, "fw3 [-q] {start|stop|flush|reload|restart}\n");
457         fprintf(stderr, "fw3 [-q] network {net}\n");
458         fprintf(stderr, "fw3 [-q] device {dev}\n");
459
460         return 1;
461 }
462
463
464 int main(int argc, char **argv)
465 {
466         int ch, rv = 1;
467         struct fw3_defaults *defs = NULL;
468
469         while ((ch = getopt(argc, argv, "46dqh")) != -1)
470         {
471                 switch (ch)
472                 {
473                 case '4':
474                         print_family = FW3_FAMILY_V4;
475                         break;
476
477                 case '6':
478                         print_family = FW3_FAMILY_V6;
479                         break;
480
481                 case 'd':
482                         fw3_pr_debug = true;
483                         break;
484
485                 case 'q':
486                         freopen("/dev/null", "w", stderr);
487                         break;
488
489                 case 'h':
490                         rv = usage();
491                         goto out;
492                 }
493         }
494
495         build_state(false);
496         build_state(true);
497         defs = &cfg_state->defaults;
498
499         if (optind >= argc)
500         {
501                 rv = usage();
502                 goto out;
503         }
504
505         if (!strcmp(argv[optind], "print"))
506         {
507                 if (print_family == FW3_FAMILY_ANY)
508                         print_family = FW3_FAMILY_V4;
509                 else if (print_family == FW3_FAMILY_V6 && defs->disable_ipv6)
510                         warn("IPv6 rules globally disabled in configuration");
511
512                 freopen("/dev/null", "w", stderr);
513
514                 cfg_state->disable_ipsets = true;
515                 fw3_pr_debug = true;
516
517                 rv = start();
518         }
519         else if (!strcmp(argv[optind], "start"))
520         {
521                 if (fw3_lock())
522                 {
523                         rv = start();
524                         fw3_unlock();
525                 }
526         }
527         else if (!strcmp(argv[optind], "stop"))
528         {
529                 if (fw3_lock())
530                 {
531                         rv = stop(false);
532                         fw3_unlock();
533                 }
534         }
535         else if (!strcmp(argv[optind], "flush"))
536         {
537                 if (fw3_lock())
538                 {
539                         rv = stop(true);
540                         fw3_unlock();
541                 }
542         }
543         else if (!strcmp(argv[optind], "restart"))
544         {
545                 if (fw3_lock())
546                 {
547                         stop(true);
548                         rv = start();
549                         fw3_unlock();
550                 }
551         }
552         else if (!strcmp(argv[optind], "reload"))
553         {
554                 if (fw3_lock())
555                 {
556                         rv = reload();
557                         fw3_unlock();
558                 }
559         }
560         else if (!strcmp(argv[optind], "network") && (optind + 1) < argc)
561         {
562                 rv = lookup_network(argv[optind + 1]);
563         }
564         else if (!strcmp(argv[optind], "device") && (optind + 1) < argc)
565         {
566                 rv = lookup_device(argv[optind + 1]);
567         }
568         else
569         {
570                 rv = usage();
571         }
572
573 out:
574         if (cfg_state)
575                 free_state(cfg_state);
576
577         if (run_state)
578                 free_state(run_state);
579
580         return rv;
581 }