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3d41e130f50b7308dc545e01b6104c7c1cc25eb0
[project/odhcpd.git] / src / config.c
1 #include <fcntl.h>
2 #include <resolv.h>
3 #include <signal.h>
4 #include <arpa/inet.h>
5 #include <unistd.h>
6 #include <libgen.h>
7 #include <net/if.h>
8 #include <string.h>
9 #include <sys/stat.h>
10 #include <syslog.h>
11
12 #include <uci.h>
13 #include <uci_blob.h>
14 #include <libubox/utils.h>
15 #include <libubox/avl.h>
16 #include <libubox/avl-cmp.h>
17 #include <libubox/list.h>
18 #include <libubox/vlist.h>
19
20 #include "odhcpd.h"
21
22 static struct blob_buf b;
23 static int reload_pipe[2] = { -1, -1 };
24
25 static int lease_cmp(const void *k1, const void *k2, void *ptr);
26 static void lease_update(struct vlist_tree *tree, struct vlist_node *node_new,
27 struct vlist_node *node_old);
28
29 struct vlist_tree leases = VLIST_TREE_INIT(leases, lease_cmp, lease_update, true, false);
30 AVL_TREE(interfaces, avl_strcmp, false, NULL);
31 struct config config = {.legacy = false, .main_dhcpv4 = false,
32 .dhcp_cb = NULL, .dhcp_statefile = NULL,
33 .log_level = LOG_WARNING};
34
35 #define START_DEFAULT 100
36 #define LIMIT_DEFAULT 150
37
38 #define OAF_DHCPV6 (OAF_DHCPV6_NA | OAF_DHCPV6_PD)
39
40 enum {
41 IFACE_ATTR_INTERFACE,
42 IFACE_ATTR_IFNAME,
43 IFACE_ATTR_NETWORKID,
44 IFACE_ATTR_DYNAMICDHCP,
45 IFACE_ATTR_LEASETIME,
46 IFACE_ATTR_LIMIT,
47 IFACE_ATTR_START,
48 IFACE_ATTR_MASTER,
49 IFACE_ATTR_UPSTREAM,
50 IFACE_ATTR_RA,
51 IFACE_ATTR_DHCPV4,
52 IFACE_ATTR_DHCPV6,
53 IFACE_ATTR_NDP,
54 IFACE_ATTR_ROUTER,
55 IFACE_ATTR_DNS,
56 IFACE_ATTR_DOMAIN,
57 IFACE_ATTR_FILTER_CLASS,
58 IFACE_ATTR_DHCPV4_FORCERECONF,
59 IFACE_ATTR_DHCPV6_RAW,
60 IFACE_ATTR_DHCPV6_ASSIGNALL,
61 IFACE_ATTR_DHCPV6_PD,
62 IFACE_ATTR_DHCPV6_NA,
63 IFACE_ATTR_RA_DEFAULT,
64 IFACE_ATTR_RA_MANAGEMENT,
65 IFACE_ATTR_RA_FLAGS,
66 IFACE_ATTR_RA_SLAAC,
67 IFACE_ATTR_RA_OFFLINK,
68 IFACE_ATTR_RA_PREFERENCE,
69 IFACE_ATTR_RA_ADVROUTER,
70 IFACE_ATTR_RA_MININTERVAL,
71 IFACE_ATTR_RA_MAXINTERVAL,
72 IFACE_ATTR_RA_LIFETIME,
73 IFACE_ATTR_RA_USELEASETIME,
74 IFACE_ATTR_RA_REACHABLETIME,
75 IFACE_ATTR_RA_RETRANSTIME,
76 IFACE_ATTR_RA_HOPLIMIT,
77 IFACE_ATTR_RA_MTU,
78 IFACE_ATTR_RA_DNS,
79 IFACE_ATTR_PD_MANAGER,
80 IFACE_ATTR_PD_CER,
81 IFACE_ATTR_NDPROXY_ROUTING,
82 IFACE_ATTR_NDPROXY_SLAVE,
83 IFACE_ATTR_PREFIX_FILTER,
84 IFACE_ATTR_MAX
85 };
86
87 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
88 [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
89 [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
90 [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
91 [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
92 [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
93 [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
94 [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
95 [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
96 [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
97 [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
98 [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
99 [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
100 [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
101 [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
102 [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
103 [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
104 [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
105 [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
106 [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
107 [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
108 [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
109 [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
110 [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
111 [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
112 [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
113 [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
114 [IFACE_ATTR_RA_FLAGS] = { .name = "ra_flags", . type = BLOBMSG_TYPE_ARRAY },
115 [IFACE_ATTR_RA_SLAAC] = { .name = "ra_slaac", .type = BLOBMSG_TYPE_BOOL },
116 [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
117 [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
118 [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
119 [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
120 [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
121 [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
122 [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
123 [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
124 [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
125 [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
126 [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
127 [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
128 [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
129 [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
130 [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
131 };
132
133 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
134 [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
135 [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
136 [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
137 };
138
139 const struct uci_blob_param_list interface_attr_list = {
140 .n_params = IFACE_ATTR_MAX,
141 .params = iface_attrs,
142 .info = iface_attr_info,
143 };
144
145 enum {
146 LEASE_ATTR_IP,
147 LEASE_ATTR_MAC,
148 LEASE_ATTR_DUID,
149 LEASE_ATTR_HOSTID,
150 LEASE_ATTR_LEASETIME,
151 LEASE_ATTR_NAME,
152 LEASE_ATTR_MAX
153 };
154
155 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
156 [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
157 [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
158 [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
159 [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
160 [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
161 [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
162 };
163
164 const struct uci_blob_param_list lease_attr_list = {
165 .n_params = LEASE_ATTR_MAX,
166 .params = lease_attrs,
167 };
168
169 enum {
170 ODHCPD_ATTR_LEGACY,
171 ODHCPD_ATTR_MAINDHCP,
172 ODHCPD_ATTR_LEASEFILE,
173 ODHCPD_ATTR_LEASETRIGGER,
174 ODHCPD_ATTR_LOGLEVEL,
175 ODHCPD_ATTR_MAX
176 };
177
178 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
179 [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
180 [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
181 [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
182 [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
183 [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
184 };
185
186 const struct uci_blob_param_list odhcpd_attr_list = {
187 .n_params = ODHCPD_ATTR_MAX,
188 .params = odhcpd_attrs,
189 };
190
191 static const struct { const char *name; uint8_t flag; } ra_flags[] = {
192 { .name = "managed-config", .flag = ND_RA_FLAG_MANAGED },
193 { .name = "other-config", .flag = ND_RA_FLAG_OTHER },
194 { .name = "home-agent", .flag = ND_RA_FLAG_HOME_AGENT },
195 { .name = "none", . flag = 0 },
196 { .name = NULL, },
197 };
198
199 static int mkdir_p(char *dir, mode_t mask)
200 {
201 char *l = strrchr(dir, '/');
202 int ret;
203
204 if (!l)
205 return 0;
206
207 *l = '\0';
208
209 if (mkdir_p(dir, mask))
210 return -1;
211
212 *l = '/';
213
214 ret = mkdir(dir, mask);
215 if (ret && errno == EEXIST)
216 return 0;
217
218 if (ret)
219 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
220
221 return ret;
222 }
223
224 static void set_interface_defaults(struct interface *iface)
225 {
226 iface->ignore = true;
227 iface->dhcpv4 = MODE_DISABLED;
228 iface->dhcpv6 = MODE_DISABLED;
229 iface->ra = MODE_DISABLED;
230 iface->ndp = MODE_DISABLED;
231 iface->learn_routes = 1;
232 iface->dhcp_leasetime = 43200;
233 iface->dhcpv4_start.s_addr = htonl(START_DEFAULT);
234 iface->dhcpv4_end.s_addr = htonl(START_DEFAULT + LIMIT_DEFAULT - 1);
235 iface->dhcpv6_assignall = true;
236 iface->dhcpv6_pd = true;
237 iface->dhcpv6_na = true;
238 iface->ra_flags = ND_RA_FLAG_OTHER;
239 iface->ra_slaac = true;
240 iface->ra_maxinterval = 600;
241 iface->ra_mininterval = iface->ra_maxinterval/3;
242 iface->ra_lifetime = -1;
243 iface->ra_dns = true;
244 }
245
246 static void clean_interface(struct interface *iface)
247 {
248 free(iface->dns);
249 free(iface->search);
250 free(iface->upstream);
251 free(iface->dhcpv4_router);
252 free(iface->dhcpv4_dns);
253 free(iface->dhcpv6_raw);
254 free(iface->filter_class);
255 memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
256 set_interface_defaults(iface);
257 }
258
259 static void close_interface(struct interface *iface)
260 {
261 avl_delete(&interfaces, &iface->avl);
262
263 router_setup_interface(iface, false);
264 dhcpv6_setup_interface(iface, false);
265 ndp_setup_interface(iface, false);
266 #ifdef DHCPV4_SUPPORT
267 dhcpv4_setup_interface(iface, false);
268 #endif
269
270 clean_interface(iface);
271 free(iface->addr4);
272 free(iface->addr6);
273 free(iface->ifname);
274 free(iface);
275 }
276
277 static int parse_mode(const char *mode)
278 {
279 if (!strcmp(mode, "disabled"))
280 return MODE_DISABLED;
281 else if (!strcmp(mode, "server"))
282 return MODE_SERVER;
283 else if (!strcmp(mode, "relay"))
284 return MODE_RELAY;
285 else if (!strcmp(mode, "hybrid"))
286 return MODE_HYBRID;
287 else
288 return -1;
289 }
290
291 static int parse_ra_flags(uint8_t *flags, struct blob_attr *attr)
292 {
293 struct blob_attr *cur;
294 unsigned rem;
295
296 blobmsg_for_each_attr(cur, attr, rem) {
297 int i;
298
299 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
300 continue;
301
302 if (!blobmsg_check_attr(cur, false))
303 continue;
304
305 for (i = 0; ra_flags[i].name; i++) {
306 if (!strcmp(ra_flags[i].name, blobmsg_get_string(cur))) {
307 *flags |= ra_flags[i].flag;
308 break;
309 }
310 }
311
312 if (!ra_flags[i].name)
313 return -1;
314 }
315
316 return 0;
317 }
318
319 static void set_config(struct uci_section *s)
320 {
321 struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
322
323 blob_buf_init(&b, 0);
324 uci_to_blob(&b, s, &odhcpd_attr_list);
325 blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
326
327 if ((c = tb[ODHCPD_ATTR_LEGACY]))
328 config.legacy = blobmsg_get_bool(c);
329
330 if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
331 config.main_dhcpv4 = blobmsg_get_bool(c);
332
333 if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
334 free(config.dhcp_statefile);
335 config.dhcp_statefile = strdup(blobmsg_get_string(c));
336 }
337
338 if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
339 free(config.dhcp_cb);
340 config.dhcp_cb = strdup(blobmsg_get_string(c));
341 }
342
343 if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
344 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
345
346 if (config.log_level != log_level) {
347 config.log_level = log_level;
348 setlogmask(LOG_UPTO(config.log_level));
349 }
350 }
351 }
352
353 static double parse_leasetime(struct blob_attr *c) {
354 char *val = blobmsg_get_string(c), *endptr = NULL;
355 double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
356
357 if (time && endptr && endptr[0]) {
358 if (endptr[0] == 's')
359 time *= 1;
360 else if (endptr[0] == 'm')
361 time *= 60;
362 else if (endptr[0] == 'h')
363 time *= 3600;
364 else if (endptr[0] == 'd')
365 time *= 24 * 3600;
366 else if (endptr[0] == 'w')
367 time *= 7 * 24 * 3600;
368 else
369 goto err;
370 }
371
372 if (time < 60)
373 time = 60;
374
375 return time;
376
377 err:
378 return -1;
379 }
380
381 static void free_lease(struct lease *l)
382 {
383 free(l->hostname);
384 free(l);
385 }
386
387 static int set_lease(struct uci_section *s)
388 {
389 struct blob_attr *tb[LEASE_ATTR_MAX], *c;
390 struct lease *l;
391 size_t duidlen = 0;
392 uint8_t *duid;
393
394 blob_buf_init(&b, 0);
395 uci_to_blob(&b, s, &lease_attr_list);
396 blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
397
398 if ((c = tb[LEASE_ATTR_DUID]))
399 duidlen = (blobmsg_data_len(c) - 1) / 2;
400
401 l = calloc_a(sizeof(*l), &duid, duidlen);
402 if (!l)
403 goto err;
404
405 if ((c = tb[LEASE_ATTR_MAC]))
406 if (!ether_aton_r(blobmsg_get_string(c), &l->mac))
407 goto err;
408
409 if ((c = tb[LEASE_ATTR_DUID])) {
410 ssize_t len;
411
412 l->duid = duid;
413 len = odhcpd_unhexlify(l->duid, duidlen, blobmsg_get_string(c));
414
415 if (len < 0)
416 goto err;
417
418 l->duid_len = len;
419 }
420
421 if ((c = tb[LEASE_ATTR_NAME])) {
422 l->hostname = strdup(blobmsg_get_string(c));
423 if (!l->hostname || !odhcpd_valid_hostname(l->hostname))
424 goto err;
425 }
426
427 if ((c = tb[LEASE_ATTR_IP]))
428 if (inet_pton(AF_INET, blobmsg_get_string(c), &l->ipaddr) < 0)
429 goto err;
430
431 if ((c = tb[LEASE_ATTR_HOSTID])) {
432 errno = 0;
433 l->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
434 if (errno)
435 goto err;
436 } else {
437 uint32_t i4a = ntohl(l->ipaddr) & 0xff;
438 l->hostid = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
439 }
440
441 if ((c = tb[LEASE_ATTR_LEASETIME])) {
442 double time = parse_leasetime(c);
443 if (time < 0)
444 goto err;
445
446 l->leasetime = time;
447 }
448
449 INIT_LIST_HEAD(&l->assignments);
450 vlist_add(&leases, &l->node, l);
451 return 0;
452
453 err:
454 if (l)
455 free_lease(l);
456
457 return -1;
458 }
459
460 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
461 {
462 struct interface *iface;
463 struct blob_attr *tb[IFACE_ATTR_MAX], *c;
464 bool get_addrs = false;
465
466 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
467
468 if (tb[IFACE_ATTR_INTERFACE])
469 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
470
471 if (!name)
472 return -1;
473
474 iface = avl_find_element(&interfaces, name, iface, avl);
475 if (!iface) {
476 char *new_name;
477
478 iface = calloc_a(sizeof(*iface), &new_name, strlen(name) + 1);
479 if (!iface)
480 return -1;
481
482 iface->name = strcpy(new_name, name);
483 iface->avl.key = iface->name;
484 iface->router_event.uloop.fd = -1;
485 iface->dhcpv6_event.uloop.fd = -1;
486 iface->ndp_event.uloop.fd = -1;
487 iface->ndp_ping_fd = -1;
488 iface->dhcpv4_event.uloop.fd = -1;
489 INIT_LIST_HEAD(&iface->ia_assignments);
490 INIT_LIST_HEAD(&iface->dhcpv4_assignments);
491 INIT_LIST_HEAD(&iface->dhcpv4_fr_ips);
492
493 set_interface_defaults(iface);
494
495 avl_insert(&interfaces, &iface->avl);
496 get_addrs = overwrite = true;
497 }
498
499 const char *ifname = NULL;
500 if (overwrite) {
501 if ((c = tb[IFACE_ATTR_IFNAME]))
502 ifname = blobmsg_get_string(c);
503 else if ((c = tb[IFACE_ATTR_NETWORKID]))
504 ifname = blobmsg_get_string(c);
505 }
506
507 #ifdef WITH_UBUS
508 if (overwrite || !iface->ifname)
509 ifname = ubus_get_ifname(name);
510 #endif
511
512 if (!iface->ifname && !ifname)
513 goto err;
514
515 if (ifname) {
516 free(iface->ifname);
517 iface->ifname = strdup(ifname);
518
519 if (!iface->ifname)
520 goto err;
521
522 if (!iface->ifindex &&
523 (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
524 goto err;
525 }
526
527 if (get_addrs) {
528 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
529 true, &iface->addr6);
530
531 if (len > 0)
532 iface->addr6_len = len;
533
534 len = netlink_get_interface_addrs(iface->ifindex,
535 false, &iface->addr4);
536 if (len > 0)
537 iface->addr4_len = len;
538 }
539
540 iface->inuse = true;
541
542 if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
543 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
544
545 if ((c = tb[IFACE_ATTR_LEASETIME])) {
546 double time = parse_leasetime(c);
547 if (time < 0)
548 goto err;
549
550 iface->dhcp_leasetime = time;
551 }
552
553 if ((c = tb[IFACE_ATTR_START])) {
554 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
555 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
556 LIMIT_DEFAULT - 1);
557
558 if (config.main_dhcpv4 && config.legacy)
559 iface->dhcpv4 = MODE_SERVER;
560 }
561
562 if ((c = tb[IFACE_ATTR_LIMIT]))
563 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
564 blobmsg_get_u32(c) - 1);
565
566 if ((c = tb[IFACE_ATTR_MASTER]))
567 iface->master = blobmsg_get_bool(c);
568
569 if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
570 struct blob_attr *cur;
571 unsigned rem;
572
573 blobmsg_for_each_attr(cur, c, rem) {
574 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
575 continue;
576
577 iface->upstream = realloc(iface->upstream,
578 iface->upstream_len + blobmsg_data_len(cur));
579 if (!iface->upstream)
580 goto err;
581
582 memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
583 iface->upstream_len += blobmsg_data_len(cur);
584 }
585 }
586
587 int mode;
588 if ((c = tb[IFACE_ATTR_RA])) {
589 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
590 iface->ra = mode;
591
592 if (iface->ra != MODE_DISABLED)
593 iface->ignore = false;
594 } else
595 goto err;
596 }
597
598 if ((c = tb[IFACE_ATTR_DHCPV4])) {
599 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
600 if (config.main_dhcpv4) {
601 iface->dhcpv4 = mode;
602
603 if (iface->dhcpv4 != MODE_DISABLED)
604 iface->ignore = false;
605 }
606 }
607 else
608 goto err;
609 }
610
611 if ((c = tb[IFACE_ATTR_DHCPV6])) {
612 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
613 iface->dhcpv6 = mode;
614
615 if (iface->dhcpv6 != MODE_DISABLED)
616 iface->ignore = false;
617 } else
618 goto err;
619 }
620
621 if ((c = tb[IFACE_ATTR_NDP])) {
622 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
623 iface->ndp = mode;
624
625 if (iface->ndp != MODE_DISABLED)
626 iface->ignore = false;
627 } else
628 goto err;
629 }
630
631 if ((c = tb[IFACE_ATTR_ROUTER])) {
632 struct blob_attr *cur;
633 unsigned rem;
634
635 blobmsg_for_each_attr(cur, c, rem) {
636 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
637 continue;
638
639 struct in_addr addr4;
640 if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
641 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
642 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
643 if (!iface->dhcpv4_router)
644 goto err;
645
646 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
647 } else
648 goto err;
649 }
650 }
651
652 if ((c = tb[IFACE_ATTR_DNS])) {
653 struct blob_attr *cur;
654 unsigned rem;
655
656 iface->always_rewrite_dns = true;
657 blobmsg_for_each_attr(cur, c, rem) {
658 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
659 continue;
660
661 struct in_addr addr4;
662 struct in6_addr addr6;
663 if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
664 if (addr4.s_addr == INADDR_ANY)
665 goto err;
666
667 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
668 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
669 if (!iface->dhcpv4_dns)
670 goto err;
671
672 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
673 } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
674 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
675 goto err;
676
677 iface->dns = realloc(iface->dns,
678 (++iface->dns_cnt) * sizeof(*iface->dns));
679 if (!iface->dns)
680 goto err;
681
682 iface->dns[iface->dns_cnt - 1] = addr6;
683 } else
684 goto err;
685 }
686 }
687
688 if ((c = tb[IFACE_ATTR_DOMAIN])) {
689 struct blob_attr *cur;
690 unsigned rem;
691
692 blobmsg_for_each_attr(cur, c, rem) {
693 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
694 continue;
695
696 uint8_t buf[256];
697 char *domain = blobmsg_get_string(cur);
698 size_t domainlen = strlen(domain);
699 if (domainlen > 0 && domain[domainlen - 1] == '.')
700 domain[domainlen - 1] = 0;
701
702 int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
703 if (len <= 0)
704 goto err;
705
706 iface->search = realloc(iface->search, iface->search_len + len);
707 if (!iface->search)
708 goto err;
709
710 memcpy(&iface->search[iface->search_len], buf, len);
711 iface->search_len += len;
712 }
713 }
714
715 if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
716 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
717 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
718 }
719
720 if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
721 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
722
723 if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
724 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
725 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
726 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
727 }
728
729 if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
730 iface->dhcpv6_assignall = blobmsg_get_bool(c);
731
732 if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
733 iface->dhcpv6_pd = blobmsg_get_bool(c);
734
735 if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
736 iface->dhcpv6_na = blobmsg_get_bool(c);
737
738 if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
739 iface->default_router = blobmsg_get_u32(c);
740
741 if (!tb[IFACE_ATTR_RA_FLAGS] && !tb[IFACE_ATTR_RA_SLAAC] &&
742 (c = tb[IFACE_ATTR_RA_MANAGEMENT])) {
743 switch (blobmsg_get_u32(c)) {
744 case 0:
745 iface->ra_flags = ND_RA_FLAG_OTHER;
746 iface->ra_slaac = true;
747 break;
748 case 1:
749 iface->ra_flags = ND_RA_FLAG_OTHER|ND_RA_FLAG_MANAGED;
750 iface->ra_slaac = true;
751 break;
752 case 2:
753 iface->ra_flags = ND_RA_FLAG_OTHER|ND_RA_FLAG_MANAGED;
754 iface->ra_slaac = false;
755 break;
756 default:
757 break;
758 }
759 }
760
761 if ((c = tb[IFACE_ATTR_RA_FLAGS])) {
762 iface->ra_flags = 0;
763 if (parse_ra_flags(&iface->ra_flags, c) < 0)
764 goto err;
765 }
766
767 if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
768 uint32_t ra_reachabletime = blobmsg_get_u32(c);
769 if (ra_reachabletime > 3600000)
770 goto err;
771
772 iface->ra_reachabletime = ra_reachabletime;
773 }
774
775 if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
776 uint32_t ra_retranstime = blobmsg_get_u32(c);
777 if (ra_retranstime > 60000)
778 goto err;
779
780 iface->ra_retranstime = ra_retranstime;
781 }
782
783 if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
784 uint32_t ra_hoplimit = blobmsg_get_u32(c);
785 if (ra_hoplimit > 255)
786 goto err;
787
788 iface->ra_hoplimit = ra_hoplimit;
789 }
790
791 if ((c = tb[IFACE_ATTR_RA_MTU])) {
792 uint32_t ra_mtu = blobmsg_get_u32(c);
793 if (ra_mtu < 1280 || ra_mtu > 65535)
794 goto err;
795
796 iface->ra_mtu = ra_mtu;
797 }
798
799 if ((c = tb[IFACE_ATTR_RA_SLAAC]))
800 iface->ra_slaac = blobmsg_get_bool(c);
801
802 if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
803 iface->ra_not_onlink = blobmsg_get_bool(c);
804
805 if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
806 iface->ra_advrouter = blobmsg_get_bool(c);
807
808 if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
809 iface->ra_mininterval = blobmsg_get_u32(c);
810
811 if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
812 iface->ra_maxinterval = blobmsg_get_u32(c);
813
814 if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
815 iface->ra_lifetime = blobmsg_get_u32(c);
816
817 if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
818 iface->ra_useleasetime = blobmsg_get_bool(c);
819
820 if ((c = tb[IFACE_ATTR_RA_DNS]))
821 iface->ra_dns = blobmsg_get_bool(c);
822
823 if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
824 const char *prio = blobmsg_get_string(c);
825
826 if (!strcmp(prio, "high"))
827 iface->route_preference = 1;
828 else if (!strcmp(prio, "low"))
829 iface->route_preference = -1;
830 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
831 iface->route_preference = 0;
832 else
833 goto err;
834 }
835
836 if ((c = tb[IFACE_ATTR_PD_MANAGER]))
837 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
838 sizeof(iface->dhcpv6_pd_manager) - 1);
839
840 if ((c = tb[IFACE_ATTR_PD_CER]) &&
841 inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
842 goto err;
843
844 if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
845 iface->learn_routes = blobmsg_get_bool(c);
846
847 if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
848 iface->external = blobmsg_get_bool(c);
849
850 if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
851 const char *str = blobmsg_get_string(c);
852 char *astr = malloc(strlen(str) + 1);
853 char *delim;
854 int l;
855
856 if (!astr || !strcpy(astr, str) ||
857 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
858 sscanf(delim, "%i", &l) == 0 || l > 128 ||
859 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
860 iface->pio_filter_length = 0;
861 else
862 iface->pio_filter_length = l;
863
864 if (astr)
865 free(astr);
866 }
867
868 return 0;
869
870 err:
871 close_interface(iface);
872 return -1;
873 }
874
875 static int set_interface(struct uci_section *s)
876 {
877 blob_buf_init(&b, 0);
878 uci_to_blob(&b, s, &interface_attr_list);
879
880 return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
881 }
882
883 static void lease_delete_assignments(struct lease *l, bool v6)
884 {
885 struct dhcp_assignment *a, *tmp;
886 unsigned int flag = v6 ? OAF_DHCPV6 : OAF_DHCPV4;
887
888 list_for_each_entry_safe(a, tmp, &l->assignments, lease_list) {
889 if (a->flags & flag)
890 free_assignment(a);
891 }
892 }
893
894 static void lease_update_assignments(struct lease *l)
895 {
896 struct dhcp_assignment *a;
897
898 list_for_each_entry(a, &l->assignments, lease_list) {
899 if (a->hostname)
900 free(a->hostname);
901 a->hostname = NULL;
902
903 if (l->hostname)
904 a->hostname = strdup(l->hostname);
905
906 a->leasetime = l->leasetime;
907 }
908 }
909
910 static int lease_cmp(const void *k1, const void *k2, _unused void *ptr)
911 {
912 const struct lease *l1 = k1, *l2 = k2;
913 int cmp = 0;
914
915 if (l1->duid_len != l2->duid_len)
916 return l1->duid_len - l2->duid_len;
917
918 if (l1->duid_len && l2->duid_len)
919 cmp = memcmp(l1->duid, l2->duid, l1->duid_len);
920
921 if (cmp)
922 return cmp;
923
924 return memcmp(l1->mac.ether_addr_octet, l2->mac.ether_addr_octet,
925 sizeof(l1->mac.ether_addr_octet));
926 }
927
928 static void lease_change_config(struct lease *l_old, struct lease *l_new)
929 {
930 bool update = false;
931
932 if ((!!l_new->hostname != !!l_old->hostname) ||
933 (l_new->hostname && strcmp(l_new->hostname, l_old->hostname))) {
934 free(l_old->hostname);
935 l_old->hostname = NULL;
936
937 if (l_new->hostname)
938 l_old->hostname = strdup(l_new->hostname);
939
940 update = true;
941 }
942
943 if (l_old->leasetime != l_new->leasetime) {
944 l_old->leasetime = l_new->leasetime;
945 update = true;
946 }
947
948 if (l_old->ipaddr != l_new->ipaddr) {
949 l_old->ipaddr = l_new->ipaddr;
950 lease_delete_assignments(l_old, false);
951 }
952
953 if (l_old->hostid != l_new->hostid) {
954 l_old->hostid = l_new->hostid;
955 lease_delete_assignments(l_old, true);
956 }
957
958 if (update)
959 lease_update_assignments(l_old);
960
961 free_lease(l_new);
962 }
963
964 static void lease_delete(struct lease *l)
965 {
966 struct dhcp_assignment *a, *tmp;
967
968 list_for_each_entry_safe(a, tmp, &l->assignments, lease_list)
969 free_assignment(a);
970
971 free_lease(l);
972 }
973
974 static void lease_update(_unused struct vlist_tree *tree, struct vlist_node *node_new,
975 struct vlist_node *node_old)
976 {
977 struct lease *lease_new = container_of(node_new, struct lease, node);
978 struct lease *lease_old = container_of(node_old, struct lease, node);
979
980 if (node_old && node_new)
981 lease_change_config(lease_old, lease_new);
982 else if (node_old)
983 lease_delete(lease_old);
984 }
985
986 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len)
987 {
988 struct lease *l;
989
990 vlist_for_each_element(&leases, l, node) {
991 if (l->duid_len == len && !memcmp(l->duid, duid, len))
992 return l;
993 }
994
995 return NULL;
996 }
997
998 struct lease *config_find_lease_by_mac(const uint8_t *mac)
999 {
1000 struct lease *l;
1001
1002 vlist_for_each_element(&leases, l, node) {
1003 if (!memcmp(l->mac.ether_addr_octet, mac,
1004 sizeof(l->mac.ether_addr_octet)))
1005 return l;
1006 }
1007
1008 return NULL;
1009 }
1010
1011 struct lease *config_find_lease_by_hostid(const uint32_t hostid)
1012 {
1013 struct lease *l;
1014
1015 vlist_for_each_element(&leases, l, node) {
1016 if (l->hostid == hostid)
1017 return l;
1018 }
1019
1020 return NULL;
1021 }
1022
1023 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr)
1024 {
1025 struct lease *l;
1026
1027 vlist_for_each_element(&leases, l, node) {
1028 if (l->ipaddr == ipaddr)
1029 return l;
1030 }
1031
1032 return NULL;
1033 }
1034
1035 void odhcpd_reload(void)
1036 {
1037 struct uci_context *uci = uci_alloc_context();
1038 struct interface *master = NULL, *i, *tmp;
1039
1040 if (!uci)
1041 return;
1042
1043 vlist_update(&leases);
1044 avl_for_each_element(&interfaces, i, avl)
1045 clean_interface(i);
1046
1047 struct uci_package *dhcp = NULL;
1048 if (!uci_load(uci, "dhcp", &dhcp)) {
1049 struct uci_element *e;
1050
1051 /* 1. Global settings */
1052 uci_foreach_element(&dhcp->sections, e) {
1053 struct uci_section *s = uci_to_section(e);
1054 if (!strcmp(s->type, "odhcpd"))
1055 set_config(s);
1056 }
1057
1058 /* 2. DHCP pools */
1059 uci_foreach_element(&dhcp->sections, e) {
1060 struct uci_section *s = uci_to_section(e);
1061 if (!strcmp(s->type, "dhcp"))
1062 set_interface(s);
1063 }
1064
1065 /* 3. Static leases */
1066 uci_foreach_element(&dhcp->sections, e) {
1067 struct uci_section* s = uci_to_section(e);
1068 if (!strcmp(s->type, "host"))
1069 set_lease(s);
1070 }
1071 }
1072
1073 if (config.dhcp_statefile) {
1074 char *path = strdup(config.dhcp_statefile);
1075
1076 mkdir_p(dirname(path), 0755);
1077 free(path);
1078 }
1079
1080 vlist_flush(&leases);
1081
1082 #ifdef WITH_UBUS
1083 ubus_apply_network();
1084 #endif
1085
1086 bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
1087
1088 /* Test for */
1089 avl_for_each_element(&interfaces, i, avl) {
1090 if (i->master)
1091 continue;
1092
1093 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
1094 any_dhcpv6_slave = true;
1095
1096 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
1097 any_ra_slave = true;
1098
1099 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
1100 any_ndp_slave = true;
1101 }
1102
1103 /* Evaluate hybrid mode for master */
1104 avl_for_each_element(&interfaces, i, avl) {
1105 if (!i->master)
1106 continue;
1107
1108 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
1109 #ifdef WITH_UBUS
1110 if (!ubus_has_prefix(i->name, i->ifname))
1111 hybrid_mode = MODE_RELAY;
1112 #endif
1113
1114 if (i->dhcpv6 == MODE_HYBRID)
1115 i->dhcpv6 = hybrid_mode;
1116
1117 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
1118 i->dhcpv6 = MODE_DISABLED;
1119
1120 if (i->ra == MODE_HYBRID)
1121 i->ra = hybrid_mode;
1122
1123 if (i->ra == MODE_RELAY && !any_ra_slave)
1124 i->ra = MODE_DISABLED;
1125
1126 if (i->ndp == MODE_HYBRID)
1127 i->ndp = hybrid_mode;
1128
1129 if (i->ndp == MODE_RELAY && !any_ndp_slave)
1130 i->ndp = MODE_DISABLED;
1131
1132 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
1133 master = i;
1134 }
1135
1136
1137 avl_for_each_element_safe(&interfaces, i, avl, tmp) {
1138 if (i->inuse) {
1139 /* Resolve hybrid mode */
1140 if (i->dhcpv6 == MODE_HYBRID)
1141 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
1142 MODE_RELAY : MODE_SERVER;
1143
1144 if (i->ra == MODE_HYBRID)
1145 i->ra = (master && master->ra == MODE_RELAY) ?
1146 MODE_RELAY : MODE_SERVER;
1147
1148 if (i->ndp == MODE_HYBRID)
1149 i->ndp = (master && master->ndp == MODE_RELAY) ?
1150 MODE_RELAY : MODE_DISABLED;
1151
1152 router_setup_interface(i, i->ra != MODE_DISABLED);
1153 dhcpv6_setup_interface(i, i->dhcpv6 != MODE_DISABLED);
1154 ndp_setup_interface(i, i->ndp != MODE_DISABLED);
1155 #ifdef DHCPV4_SUPPORT
1156 dhcpv4_setup_interface(i, i->dhcpv4 != MODE_DISABLED);
1157 #endif
1158 } else
1159 close_interface(i);
1160 }
1161
1162 uci_unload(uci, dhcp);
1163 uci_free_context(uci);
1164 }
1165
1166 static void handle_signal(int signal)
1167 {
1168 char b[1] = {0};
1169
1170 if (signal == SIGHUP) {
1171 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
1172 } else
1173 uloop_end();
1174 }
1175
1176 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
1177 {
1178 char b[512];
1179 if (read(u->fd, b, sizeof(b)) < 0) {}
1180
1181 odhcpd_reload();
1182 }
1183
1184 static struct uloop_fd reload_fd = { .fd = -1, .cb = reload_cb };
1185
1186 void odhcpd_run(void)
1187 {
1188 if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
1189
1190 reload_fd.fd = reload_pipe[0];
1191 uloop_fd_add(&reload_fd, ULOOP_READ);
1192
1193 signal(SIGTERM, handle_signal);
1194 signal(SIGINT, handle_signal);
1195 signal(SIGHUP, handle_signal);
1196
1197 #ifdef WITH_UBUS
1198 while (ubus_init())
1199 sleep(1);
1200 #endif
1201
1202 odhcpd_reload();
1203 uloop_run();
1204 }
OpenWrt DHCP Server