2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
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.
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.
26 static int lock_fd = -1;
27 static pid_t pipe_pid = -1;
28 static FILE *pipe_fd = NULL;
30 bool fw3_pr_debug = false;
34 warn_elem_section_name(struct uci_section *s, bool find_name)
38 struct uci_element *tmp;
42 uci_foreach_element(&s->package->sections, tmp)
44 if (strcmp(uci_to_section(tmp)->type, s->type))
53 fprintf(stderr, "@%s[%d]", s->type, i);
57 uci_foreach_element(&s->options, tmp)
59 o = uci_to_option(tmp);
61 if (!strcmp(tmp->name, "name") && (o->type == UCI_TYPE_STRING))
63 fprintf(stderr, " (%s)", o->v.string);
71 fprintf(stderr, "'%s'", s->e.name);
79 warn_elem(struct uci_element *e, const char *format, ...)
81 if (e->type == UCI_TYPE_SECTION)
83 fprintf(stderr, "Warning: Section ");
84 warn_elem_section_name(uci_to_section(e), true);
86 else if (e->type == UCI_TYPE_OPTION)
88 fprintf(stderr, "Warning: Option ");
89 warn_elem_section_name(uci_to_option(e)->section, false);
90 fprintf(stderr, ".%s ", e->name);
94 va_start(argptr, format);
95 vfprintf(stderr, format, argptr);
98 fprintf(stderr, "\n");
102 warn(const char* format, ...)
104 fprintf(stderr, "Warning: ");
106 va_start(argptr, format);
107 vfprintf(stderr, format, argptr);
109 fprintf(stderr, "\n");
113 error(const char* format, ...)
115 fprintf(stderr, "Error: ");
117 va_start(argptr, format);
118 vfprintf(stderr, format, argptr);
120 fprintf(stderr, "\n");
126 info(const char* format, ...)
129 va_start(argptr, format);
130 vfprintf(stderr, format, argptr);
132 fprintf(stderr, "\n");
136 fw3_find_command(const char *cmd)
139 int plen = 0, clen = strlen(cmd) + 1;
141 static char path[PATH_MAX];
143 if (!stat(cmd, &s) && S_ISREG(s.st_mode))
146 search = getenv("PATH");
149 search = "/bin:/usr/bin:/sbin:/usr/sbin";
155 if (*p != ':' && *p != '\0')
160 if ((plen + clen) >= sizeof(path))
163 strncpy(path, search, plen);
164 sprintf(path + plen, "/%s", cmd);
166 if (!stat(path, &s) && S_ISREG(s.st_mode))
177 fw3_stdout_pipe(void)
184 __fw3_command_pipe(bool silent, const char *command, ...)
190 char *arg, **args, **tmp;
192 command = fw3_find_command(command);
201 args = malloc(argn * sizeof(arg));
206 args[0] = (char *)command;
209 va_start(argp, command);
211 while ((arg = va_arg(argp, char *)) != NULL)
213 tmp = realloc(args, ++argn * sizeof(arg));
225 switch ((pid = fork()))
241 execv(command, args);
244 signal(SIGPIPE, SIG_IGN);
247 fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
250 pipe_fd = fdopen(pfds[1], "w");
255 fw3_pr(const char *fmt, ...)
259 if (fw3_pr_debug && pipe_fd != stdout)
262 vfprintf(stderr, fmt, args);
267 vfprintf(pipe_fd, fmt, args);
272 fw3_command_close(void)
274 if (pipe_fd && pipe_fd != stdout)
278 waitpid(pipe_pid, NULL, 0);
280 signal(SIGPIPE, SIG_DFL);
287 fw3_has_table(bool ipv6, const char *table)
294 const char *path = ipv6
295 ? "/proc/net/ip6_tables_names" : "/proc/net/ip_tables_names";
297 if (!(f = fopen(path, "r")))
300 while (fgets(line, sizeof(line), f))
302 if (!strncmp(line, table, strlen(table)))
318 lock_fd = open(FW3_LOCKFILE, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
322 warn("Cannot create lock file %s: %s", FW3_LOCKFILE, strerror(errno));
326 if (flock(lock_fd, LOCK_EX))
328 warn("Cannot acquire exclusive lock: %s", strerror(errno));
341 if (flock(lock_fd, LOCK_UN))
342 warn("Cannot release exclusive lock: %s", strerror(errno));
345 unlink(FW3_LOCKFILE);
352 write_defaults_uci(struct uci_context *ctx, struct fw3_defaults *d,
353 struct uci_package *dest)
355 char buf[sizeof("0xffffffff\0")];
356 struct uci_ptr ptr = { .p = dest };
358 uci_add_section(ctx, dest, "defaults", &ptr.s);
360 sprintf(buf, "0x%x", d->flags[0]);
362 ptr.option = "__flags_v4";
366 sprintf(buf, "0x%x", d->flags[1]);
368 ptr.option = "__flags_v6";
374 write_zone_uci(struct uci_context *ctx, struct fw3_zone *z,
375 struct uci_package *dest)
377 struct fw3_device *dev;
378 struct fw3_address *sub;
379 enum fw3_family fam = FW3_FAMILY_ANY;
383 struct uci_ptr ptr = { .p = dest };
388 if (fw3_no_table(z->flags[0]) && !fw3_no_table(z->flags[1]))
390 else if (!fw3_no_table(z->flags[0]) && fw3_no_table(z->flags[1]))
392 else if (fw3_no_table(z->flags[0]) && fw3_no_table(z->flags[1]))
395 uci_add_section(ctx, dest, "zone", &ptr.s);
403 ptr.option = "input";
404 ptr.value = fw3_flag_names[z->policy_input];
408 ptr.option = "output";
409 ptr.value = fw3_flag_names[z->policy_output];
413 ptr.option = "forward";
414 ptr.value = fw3_flag_names[z->policy_forward];
419 ptr.value = z->masq ? "1" : "0";
423 ptr.option = "conntrack";
424 ptr.value = z->conntrack ? "1" : "0";
428 ptr.option = "mtu_fix";
429 ptr.value = z->mtu_fix ? "1" : "0";
433 ptr.option = "custom_chains";
434 ptr.value = z->custom_chains ? "1" : "0";
437 if (fam != FW3_FAMILY_ANY)
440 ptr.option = "family";
441 ptr.value = fw3_flag_names[fam];
446 ptr.option = "device";
448 fw3_foreach(dev, &z->devices)
456 p += sprintf(p, "!");
458 p += sprintf(p, "%s", dev->name);
461 uci_add_list(ctx, &ptr);
465 ptr.option = "subnet";
467 fw3_foreach(sub, &z->subnets)
472 ptr.value = fw3_address_to_string(sub, true);
473 uci_add_list(ctx, &ptr);
476 sprintf(buf, "0x%x", z->flags[0]);
478 ptr.option = "__flags_v4";
482 sprintf(buf, "0x%x", z->flags[1]);
484 ptr.option = "__flags_v6";
490 fw3_write_statefile(void *state)
493 struct fw3_state *s = state;
496 struct uci_package *p;
498 if (fw3_no_family(s->defaults.flags[0]) &&
499 fw3_no_family(s->defaults.flags[1]))
501 unlink(FW3_STATEFILE);
505 sf = fopen(FW3_STATEFILE, "w+");
509 warn("Cannot create state %s: %s", FW3_STATEFILE, strerror(errno));
513 if ((p = uci_lookup_package(s->uci, "fw3_state")) != NULL)
514 uci_unload(s->uci, p);
516 uci_import(s->uci, sf, "fw3_state", NULL, true);
518 if ((p = uci_lookup_package(s->uci, "fw3_state")) != NULL)
520 write_defaults_uci(s->uci, &s->defaults, p);
522 list_for_each_entry(z, &s->zones, list)
523 write_zone_uci(s->uci, z, p);
525 uci_export(s->uci, sf, p, true);
526 uci_unload(s->uci, p);
535 fw3_free_object(void *obj, const void *opts)
537 const struct fw3_option *ol;
538 struct list_head *list, *cur, *tmp;
540 for (ol = opts; ol->name; ol++)
545 list = (struct list_head *)((char *)obj + ol->offset);
546 list_for_each_safe(cur, tmp, list)
558 fw3_pr_rulespec(int table, int family, uint32_t *flags, uint32_t mask,
559 const struct fw3_rule_spec *r, const char *fmt, ...)
565 uint32_t f = flags ? flags[family == FW3_FAMILY_V6] : 0;
570 for (; r->format; r++)
572 if (!fw3_is_family(r, family))
575 if (r->table != table)
578 if ((r->flag != 0) && !hasbit(f, r->flag))
582 vsnprintf(buf, sizeof(buf), r->format, ap);
595 fw3_hotplug(bool add, void *zone, void *device)
597 struct fw3_zone *z = zone;
598 struct fw3_device *d = device;
606 warn("Unable to fork(): %s\n", strerror(errno));
622 setenv("ACTION", add ? "add" : "remove", 1);
623 setenv("ZONE", z->name, 1);
624 setenv("INTERFACE", d->network->name, 1);
625 setenv("DEVICE", d->name, 1);
627 execl(FW3_HOTPLUG, FW3_HOTPLUG, "firewall", NULL);