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odhcpd: router: Fix out of scope memory access
[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 enum {
39 IFACE_ATTR_INTERFACE,
40 IFACE_ATTR_IFNAME,
41 IFACE_ATTR_NETWORKID,
42 IFACE_ATTR_DYNAMICDHCP,
43 IFACE_ATTR_LEASETIME,
44 IFACE_ATTR_LIMIT,
45 IFACE_ATTR_START,
46 IFACE_ATTR_MASTER,
47 IFACE_ATTR_UPSTREAM,
48 IFACE_ATTR_RA,
49 IFACE_ATTR_DHCPV4,
50 IFACE_ATTR_DHCPV6,
51 IFACE_ATTR_NDP,
52 IFACE_ATTR_ROUTER,
53 IFACE_ATTR_DNS,
54 IFACE_ATTR_DOMAIN,
55 IFACE_ATTR_FILTER_CLASS,
56 IFACE_ATTR_DHCPV4_FORCERECONF,
57 IFACE_ATTR_DHCPV6_RAW,
58 IFACE_ATTR_DHCPV6_ASSIGNALL,
59 IFACE_ATTR_DHCPV6_PD,
60 IFACE_ATTR_DHCPV6_NA,
61 IFACE_ATTR_RA_DEFAULT,
62 IFACE_ATTR_RA_FLAGS,
63 IFACE_ATTR_RA_SLAAC,
64 IFACE_ATTR_RA_OFFLINK,
65 IFACE_ATTR_RA_PREFERENCE,
66 IFACE_ATTR_RA_ADVROUTER,
67 IFACE_ATTR_RA_MININTERVAL,
68 IFACE_ATTR_RA_MAXINTERVAL,
69 IFACE_ATTR_RA_LIFETIME,
70 IFACE_ATTR_RA_USELEASETIME,
71 IFACE_ATTR_RA_REACHABLETIME,
72 IFACE_ATTR_RA_RETRANSTIME,
73 IFACE_ATTR_RA_HOPLIMIT,
74 IFACE_ATTR_RA_MTU,
75 IFACE_ATTR_RA_DNS,
76 IFACE_ATTR_PD_MANAGER,
77 IFACE_ATTR_PD_CER,
78 IFACE_ATTR_NDPROXY_ROUTING,
79 IFACE_ATTR_NDPROXY_SLAVE,
80 IFACE_ATTR_PREFIX_FILTER,
81 IFACE_ATTR_MAX
82 };
83
84 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
85 [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
86 [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
87 [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
88 [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
89 [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
90 [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
91 [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
92 [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
93 [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
94 [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
95 [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
96 [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
97 [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
98 [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
99 [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
100 [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
101 [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
102 [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
103 [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
104 [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
105 [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
106 [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
107 [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
108 [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
109 [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
110 [IFACE_ATTR_RA_FLAGS] = { .name = "ra_flags", . type = BLOBMSG_TYPE_ARRAY },
111 [IFACE_ATTR_RA_SLAAC] = { .name = "ra_slaac", .type = BLOBMSG_TYPE_BOOL },
112 [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
113 [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
114 [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
115 [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
116 [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
117 [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
118 [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
119 [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
120 [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
121 [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
122 [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
123 [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
124 [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
125 [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
126 [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
127 };
128
129 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
130 [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
131 [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
132 [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
133 };
134
135 const struct uci_blob_param_list interface_attr_list = {
136 .n_params = IFACE_ATTR_MAX,
137 .params = iface_attrs,
138 .info = iface_attr_info,
139 };
140
141 enum {
142 LEASE_ATTR_IP,
143 LEASE_ATTR_MAC,
144 LEASE_ATTR_DUID,
145 LEASE_ATTR_HOSTID,
146 LEASE_ATTR_LEASETIME,
147 LEASE_ATTR_NAME,
148 LEASE_ATTR_MAX
149 };
150
151 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
152 [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
153 [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
154 [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
155 [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
156 [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
157 [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
158 };
159
160 const struct uci_blob_param_list lease_attr_list = {
161 .n_params = LEASE_ATTR_MAX,
162 .params = lease_attrs,
163 };
164
165 enum {
166 ODHCPD_ATTR_LEGACY,
167 ODHCPD_ATTR_MAINDHCP,
168 ODHCPD_ATTR_LEASEFILE,
169 ODHCPD_ATTR_LEASETRIGGER,
170 ODHCPD_ATTR_LOGLEVEL,
171 ODHCPD_ATTR_MAX
172 };
173
174 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
175 [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
176 [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
177 [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
178 [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
179 [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
180 };
181
182 const struct uci_blob_param_list odhcpd_attr_list = {
183 .n_params = ODHCPD_ATTR_MAX,
184 .params = odhcpd_attrs,
185 };
186
187 static const struct { const char *name; uint8_t flag; } ra_flags[] = {
188 { .name = "managed-config", .flag = ND_RA_FLAG_MANAGED },
189 { .name = "other-config", .flag = ND_RA_FLAG_OTHER },
190 { .name = "home-agent", .flag = ND_RA_FLAG_HOME_AGENT },
191 { .name = "none", . flag = 0 },
192 { .name = NULL, },
193 };
194
195 static int mkdir_p(char *dir, mode_t mask)
196 {
197 char *l = strrchr(dir, '/');
198 int ret;
199
200 if (!l)
201 return 0;
202
203 *l = '\0';
204
205 if (mkdir_p(dir, mask))
206 return -1;
207
208 *l = '/';
209
210 ret = mkdir(dir, mask);
211 if (ret && errno == EEXIST)
212 return 0;
213
214 if (ret)
215 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
216
217 return ret;
218 }
219
220 static void set_interface_defaults(struct interface *iface)
221 {
222 iface->ignore = true;
223 iface->dhcpv4 = MODE_DISABLED;
224 iface->dhcpv6 = MODE_DISABLED;
225 iface->ra = MODE_DISABLED;
226 iface->ndp = MODE_DISABLED;
227 iface->learn_routes = 1;
228 iface->dhcpv4_leasetime = 43200;
229 iface->dhcpv4_start.s_addr = htonl(START_DEFAULT);
230 iface->dhcpv4_end.s_addr = htonl(START_DEFAULT + LIMIT_DEFAULT - 1);
231 iface->dhcpv6_assignall = true;
232 iface->dhcpv6_pd = true;
233 iface->dhcpv6_na = true;
234 iface->ra_flags = ND_RA_FLAG_OTHER;
235 iface->ra_slaac = true;
236 iface->ra_maxinterval = 600;
237 iface->ra_mininterval = iface->ra_maxinterval/3;
238 iface->ra_lifetime = -1;
239 iface->ra_dns = true;
240 }
241
242 static void clean_interface(struct interface *iface)
243 {
244 free(iface->dns);
245 free(iface->search);
246 free(iface->upstream);
247 free(iface->dhcpv4_router);
248 free(iface->dhcpv4_dns);
249 free(iface->dhcpv6_raw);
250 free(iface->filter_class);
251 memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
252 set_interface_defaults(iface);
253 }
254
255 static void close_interface(struct interface *iface)
256 {
257 avl_delete(&interfaces, &iface->avl);
258
259 router_setup_interface(iface, false);
260 dhcpv6_setup_interface(iface, false);
261 ndp_setup_interface(iface, false);
262 #ifdef DHCPV4_SUPPORT
263 dhcpv4_setup_interface(iface, false);
264 #endif
265
266 clean_interface(iface);
267 free(iface->addr4);
268 free(iface->addr6);
269 free(iface->ifname);
270 free(iface);
271 }
272
273 static int parse_mode(const char *mode)
274 {
275 if (!strcmp(mode, "disabled"))
276 return MODE_DISABLED;
277 else if (!strcmp(mode, "server"))
278 return MODE_SERVER;
279 else if (!strcmp(mode, "relay"))
280 return MODE_RELAY;
281 else if (!strcmp(mode, "hybrid"))
282 return MODE_HYBRID;
283 else
284 return -1;
285 }
286
287 static int parse_ra_flags(uint8_t *flags, struct blob_attr *attr)
288 {
289 struct blob_attr *cur;
290 unsigned rem;
291
292 blobmsg_for_each_attr(cur, attr, rem) {
293 int i;
294
295 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
296 continue;
297
298 if (!blobmsg_check_attr(cur, false))
299 continue;
300
301 for (i = 0; ra_flags[i].name; i++) {
302 if (!strcmp(ra_flags[i].name, blobmsg_get_string(cur))) {
303 *flags |= ra_flags[i].flag;
304 break;
305 }
306 }
307
308 if (!ra_flags[i].name)
309 return -1;
310 }
311
312 return 0;
313 }
314
315 static void set_config(struct uci_section *s)
316 {
317 struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
318
319 blob_buf_init(&b, 0);
320 uci_to_blob(&b, s, &odhcpd_attr_list);
321 blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
322
323 if ((c = tb[ODHCPD_ATTR_LEGACY]))
324 config.legacy = blobmsg_get_bool(c);
325
326 if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
327 config.main_dhcpv4 = blobmsg_get_bool(c);
328
329 if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
330 free(config.dhcp_statefile);
331 config.dhcp_statefile = strdup(blobmsg_get_string(c));
332 }
333
334 if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
335 free(config.dhcp_cb);
336 config.dhcp_cb = strdup(blobmsg_get_string(c));
337 }
338
339 if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
340 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
341
342 if (config.log_level != log_level) {
343 config.log_level = log_level;
344 setlogmask(LOG_UPTO(config.log_level));
345 }
346 }
347 }
348
349 static double parse_leasetime(struct blob_attr *c) {
350 char *val = blobmsg_get_string(c), *endptr = NULL;
351 double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
352
353 if (time && endptr && endptr[0]) {
354 if (endptr[0] == 's')
355 time *= 1;
356 else if (endptr[0] == 'm')
357 time *= 60;
358 else if (endptr[0] == 'h')
359 time *= 3600;
360 else if (endptr[0] == 'd')
361 time *= 24 * 3600;
362 else if (endptr[0] == 'w')
363 time *= 7 * 24 * 3600;
364 else
365 goto err;
366 }
367
368 if (time < 60)
369 time = 60;
370
371 return time;
372
373 err:
374 return -1;
375 }
376
377 static void free_lease(struct lease *l)
378 {
379 free(l->hostname);
380 free(l);
381 }
382
383 static int set_lease(struct uci_section *s)
384 {
385 struct blob_attr *tb[LEASE_ATTR_MAX], *c;
386 struct lease *l;
387 size_t duidlen = 0;
388 uint8_t *duid;
389
390 blob_buf_init(&b, 0);
391 uci_to_blob(&b, s, &lease_attr_list);
392 blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
393
394 if ((c = tb[LEASE_ATTR_DUID]))
395 duidlen = (blobmsg_data_len(c) - 1) / 2;
396
397 l = calloc_a(sizeof(*l), &duid, duidlen);
398 if (!l)
399 goto err;
400
401 if ((c = tb[LEASE_ATTR_MAC]))
402 if (!ether_aton_r(blobmsg_get_string(c), &l->mac))
403 goto err;
404
405 if ((c = tb[LEASE_ATTR_DUID])) {
406 ssize_t len;
407
408 l->duid = duid;
409 len = odhcpd_unhexlify(l->duid, duidlen, blobmsg_get_string(c));
410
411 if (len < 0)
412 goto err;
413
414 l->duid_len = len;
415 }
416
417 if ((c = tb[LEASE_ATTR_NAME])) {
418 l->hostname = strdup(blobmsg_get_string(c));
419 if (!l->hostname || !odhcpd_valid_hostname(l->hostname))
420 goto err;
421 }
422
423 if ((c = tb[LEASE_ATTR_IP]))
424 if (inet_pton(AF_INET, blobmsg_get_string(c), &l->ipaddr) < 0)
425 goto err;
426
427 if ((c = tb[LEASE_ATTR_HOSTID])) {
428 errno = 0;
429 l->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
430 if (errno)
431 goto err;
432 } else {
433 uint32_t i4a = ntohl(l->ipaddr) & 0xff;
434 l->hostid = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
435 }
436
437 if ((c = tb[LEASE_ATTR_LEASETIME])) {
438 double time = parse_leasetime(c);
439 if (time < 0)
440 goto err;
441
442 l->leasetime = time;
443 }
444
445 INIT_LIST_HEAD(&l->assignments);
446 vlist_add(&leases, &l->node, l);
447 return 0;
448
449 err:
450 if (l)
451 free_lease(l);
452
453 return -1;
454 }
455
456 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
457 {
458 struct interface *iface;
459 struct blob_attr *tb[IFACE_ATTR_MAX], *c;
460 bool get_addrs = false;
461
462 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
463
464 if (tb[IFACE_ATTR_INTERFACE])
465 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
466
467 if (!name)
468 return -1;
469
470 iface = avl_find_element(&interfaces, name, iface, avl);
471 if (!iface) {
472 char *new_name;
473
474 iface = calloc_a(sizeof(*iface), &new_name, strlen(name) + 1);
475 if (!iface)
476 return -1;
477
478 iface->name = strcpy(new_name, name);
479 iface->avl.key = iface->name;
480 iface->router_event.uloop.fd = -1;
481 iface->dhcpv6_event.uloop.fd = -1;
482 iface->ndp_event.uloop.fd = -1;
483 iface->ndp_ping_fd = -1;
484 iface->dhcpv4_event.uloop.fd = -1;
485 INIT_LIST_HEAD(&iface->ia_assignments);
486 INIT_LIST_HEAD(&iface->dhcpv4_assignments);
487 INIT_LIST_HEAD(&iface->dhcpv4_fr_ips);
488
489 set_interface_defaults(iface);
490
491 avl_insert(&interfaces, &iface->avl);
492 get_addrs = overwrite = true;
493 }
494
495 const char *ifname = NULL;
496 if (overwrite) {
497 if ((c = tb[IFACE_ATTR_IFNAME]))
498 ifname = blobmsg_get_string(c);
499 else if ((c = tb[IFACE_ATTR_NETWORKID]))
500 ifname = blobmsg_get_string(c);
501 }
502
503 #ifdef WITH_UBUS
504 if (overwrite || !iface->ifname)
505 ifname = ubus_get_ifname(name);
506 #endif
507
508 if (!iface->ifname && !ifname)
509 goto err;
510
511 if (ifname) {
512 free(iface->ifname);
513 iface->ifname = strdup(ifname);
514
515 if (!iface->ifname)
516 goto err;
517
518 if (!iface->ifindex &&
519 (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
520 goto err;
521 }
522
523 if (get_addrs) {
524 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
525 true, &iface->addr6);
526
527 if (len > 0)
528 iface->addr6_len = len;
529
530 len = netlink_get_interface_addrs(iface->ifindex,
531 false, &iface->addr4);
532 if (len > 0)
533 iface->addr4_len = len;
534 }
535
536 iface->inuse = true;
537
538 if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
539 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
540
541 if ((c = tb[IFACE_ATTR_LEASETIME])) {
542 double time = parse_leasetime(c);
543 if (time < 0)
544 goto err;
545
546 iface->dhcpv4_leasetime = time;
547 }
548
549 if ((c = tb[IFACE_ATTR_START])) {
550 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
551 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
552 LIMIT_DEFAULT - 1);
553
554 if (config.main_dhcpv4 && config.legacy)
555 iface->dhcpv4 = MODE_SERVER;
556 }
557
558 if ((c = tb[IFACE_ATTR_LIMIT]))
559 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
560 blobmsg_get_u32(c) - 1);
561
562 if ((c = tb[IFACE_ATTR_MASTER]))
563 iface->master = blobmsg_get_bool(c);
564
565 if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
566 struct blob_attr *cur;
567 unsigned rem;
568
569 blobmsg_for_each_attr(cur, c, rem) {
570 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
571 continue;
572
573 iface->upstream = realloc(iface->upstream,
574 iface->upstream_len + blobmsg_data_len(cur));
575 if (!iface->upstream)
576 goto err;
577
578 memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
579 iface->upstream_len += blobmsg_data_len(cur);
580 }
581 }
582
583 int mode;
584 if ((c = tb[IFACE_ATTR_RA])) {
585 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
586 iface->ra = mode;
587
588 if (iface->ra != MODE_DISABLED)
589 iface->ignore = false;
590 } else
591 goto err;
592 }
593
594 if ((c = tb[IFACE_ATTR_DHCPV4])) {
595 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
596 if (config.main_dhcpv4) {
597 iface->dhcpv4 = mode;
598
599 if (iface->dhcpv4 != MODE_DISABLED)
600 iface->ignore = false;
601 }
602 }
603 else
604 goto err;
605 }
606
607 if ((c = tb[IFACE_ATTR_DHCPV6])) {
608 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
609 iface->dhcpv6 = mode;
610
611 if (iface->dhcpv6 != MODE_DISABLED)
612 iface->ignore = false;
613 } else
614 goto err;
615 }
616
617 if ((c = tb[IFACE_ATTR_NDP])) {
618 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
619 iface->ndp = mode;
620
621 if (iface->ndp != MODE_DISABLED)
622 iface->ignore = false;
623 } else
624 goto err;
625 }
626
627 if ((c = tb[IFACE_ATTR_ROUTER])) {
628 struct blob_attr *cur;
629 unsigned rem;
630
631 blobmsg_for_each_attr(cur, c, rem) {
632 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
633 continue;
634
635 struct in_addr addr4;
636 if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
637 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
638 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
639 if (!iface->dhcpv4_router)
640 goto err;
641
642 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
643 } else
644 goto err;
645 }
646 }
647
648 if ((c = tb[IFACE_ATTR_DNS])) {
649 struct blob_attr *cur;
650 unsigned rem;
651
652 iface->always_rewrite_dns = true;
653 blobmsg_for_each_attr(cur, c, rem) {
654 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
655 continue;
656
657 struct in_addr addr4;
658 struct in6_addr addr6;
659 if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
660 if (addr4.s_addr == INADDR_ANY)
661 goto err;
662
663 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
664 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
665 if (!iface->dhcpv4_dns)
666 goto err;
667
668 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
669 } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
670 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
671 goto err;
672
673 iface->dns = realloc(iface->dns,
674 (++iface->dns_cnt) * sizeof(*iface->dns));
675 if (!iface->dns)
676 goto err;
677
678 iface->dns[iface->dns_cnt - 1] = addr6;
679 } else
680 goto err;
681 }
682 }
683
684 if ((c = tb[IFACE_ATTR_DOMAIN])) {
685 struct blob_attr *cur;
686 unsigned rem;
687
688 blobmsg_for_each_attr(cur, c, rem) {
689 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
690 continue;
691
692 uint8_t buf[256];
693 char *domain = blobmsg_get_string(cur);
694 size_t domainlen = strlen(domain);
695 if (domainlen > 0 && domain[domainlen - 1] == '.')
696 domain[domainlen - 1] = 0;
697
698 int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
699 if (len <= 0)
700 goto err;
701
702 iface->search = realloc(iface->search, iface->search_len + len);
703 if (!iface->search)
704 goto err;
705
706 memcpy(&iface->search[iface->search_len], buf, len);
707 iface->search_len += len;
708 }
709 }
710
711 if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
712 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
713 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
714 }
715
716 if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
717 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
718
719 if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
720 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
721 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
722 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
723 }
724
725 if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
726 iface->dhcpv6_assignall = blobmsg_get_bool(c);
727
728 if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
729 iface->dhcpv6_pd = blobmsg_get_bool(c);
730
731 if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
732 iface->dhcpv6_na = blobmsg_get_bool(c);
733
734 if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
735 iface->default_router = blobmsg_get_u32(c);
736
737 if ((c = tb[IFACE_ATTR_RA_FLAGS])) {
738 iface->ra_flags = 0;
739 if (parse_ra_flags(&iface->ra_flags, c) < 0)
740 goto err;
741 }
742
743 if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
744 uint32_t ra_reachabletime = blobmsg_get_u32(c);
745 if (ra_reachabletime > 3600000)
746 goto err;
747
748 iface->ra_reachabletime = ra_reachabletime;
749 }
750
751 if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
752 uint32_t ra_retranstime = blobmsg_get_u32(c);
753 if (ra_retranstime > 60000)
754 goto err;
755
756 iface->ra_retranstime = ra_retranstime;
757 }
758
759 if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
760 uint32_t ra_hoplimit = blobmsg_get_u32(c);
761 if (ra_hoplimit > 255)
762 goto err;
763
764 iface->ra_hoplimit = ra_hoplimit;
765 }
766
767 if ((c = tb[IFACE_ATTR_RA_MTU])) {
768 uint32_t ra_mtu = blobmsg_get_u32(c);
769 if (ra_mtu < 1280 || ra_mtu > 65535)
770 goto err;
771
772 iface->ra_mtu = ra_mtu;
773 }
774
775 if ((c = tb[IFACE_ATTR_RA_SLAAC]))
776 iface->ra_slaac = blobmsg_get_bool(c);
777
778 if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
779 iface->ra_not_onlink = blobmsg_get_bool(c);
780
781 if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
782 iface->ra_advrouter = blobmsg_get_bool(c);
783
784 if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
785 iface->ra_mininterval = blobmsg_get_u32(c);
786
787 if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
788 iface->ra_maxinterval = blobmsg_get_u32(c);
789
790 if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
791 iface->ra_lifetime = blobmsg_get_u32(c);
792
793 if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
794 iface->ra_useleasetime = blobmsg_get_bool(c);
795
796 if ((c = tb[IFACE_ATTR_RA_DNS]))
797 iface->ra_dns = blobmsg_get_bool(c);
798
799 if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
800 const char *prio = blobmsg_get_string(c);
801
802 if (!strcmp(prio, "high"))
803 iface->route_preference = 1;
804 else if (!strcmp(prio, "low"))
805 iface->route_preference = -1;
806 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
807 iface->route_preference = 0;
808 else
809 goto err;
810 }
811
812 if ((c = tb[IFACE_ATTR_PD_MANAGER]))
813 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
814 sizeof(iface->dhcpv6_pd_manager) - 1);
815
816 if ((c = tb[IFACE_ATTR_PD_CER]) &&
817 inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
818 goto err;
819
820 if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
821 iface->learn_routes = blobmsg_get_bool(c);
822
823 if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
824 iface->external = blobmsg_get_bool(c);
825
826 if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
827 const char *str = blobmsg_get_string(c);
828 char *astr = malloc(strlen(str) + 1);
829 char *delim;
830 int l;
831
832 if (!astr || !strcpy(astr, str) ||
833 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
834 sscanf(delim, "%i", &l) == 0 || l > 128 ||
835 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
836 iface->pio_filter_length = 0;
837 else
838 iface->pio_filter_length = l;
839
840 if (astr)
841 free(astr);
842 }
843
844 return 0;
845
846 err:
847 close_interface(iface);
848 return -1;
849 }
850
851 static int set_interface(struct uci_section *s)
852 {
853 blob_buf_init(&b, 0);
854 uci_to_blob(&b, s, &interface_attr_list);
855
856 return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
857 }
858
859 static void lease_delete_assignments(struct lease *l, bool v6)
860 {
861 struct dhcp_assignment *a, *tmp;
862 unsigned int flag = v6 ? OAF_DHCPV6 : OAF_DHCPV4;
863
864 list_for_each_entry_safe(a, tmp, &l->assignments, lease_list) {
865 if (a->flags & flag)
866 free_assignment(a);
867 }
868 }
869
870 static void lease_update_assignments(struct lease *l)
871 {
872 struct dhcp_assignment *a;
873
874 list_for_each_entry(a, &l->assignments, lease_list) {
875 if (a->hostname)
876 free(a->hostname);
877 a->hostname = NULL;
878
879 if (l->hostname)
880 a->hostname = strdup(l->hostname);
881
882 a->leasetime = l->leasetime;
883 }
884 }
885
886 static int lease_cmp(const void *k1, const void *k2, _unused void *ptr)
887 {
888 const struct lease *l1 = k1, *l2 = k2;
889 int cmp = 0;
890
891 if (l1->duid_len != l2->duid_len)
892 return l1->duid_len - l2->duid_len;
893
894 if (l1->duid_len && l2->duid_len)
895 cmp = memcmp(l1->duid, l2->duid, l1->duid_len);
896
897 if (cmp)
898 return cmp;
899
900 return memcmp(l1->mac.ether_addr_octet, l2->mac.ether_addr_octet,
901 sizeof(l1->mac.ether_addr_octet));
902 }
903
904 static void lease_change_config(struct lease *l_old, struct lease *l_new)
905 {
906 bool update = false;
907
908 if ((!!l_new->hostname != !!l_old->hostname) ||
909 (l_new->hostname && strcmp(l_new->hostname, l_old->hostname))) {
910 free(l_old->hostname);
911 l_old->hostname = NULL;
912
913 if (l_new->hostname)
914 l_old->hostname = strdup(l_new->hostname);
915
916 update = true;
917 }
918
919 if (l_old->leasetime != l_new->leasetime) {
920 l_old->leasetime = l_new->leasetime;
921 update = true;
922 }
923
924 if (l_old->ipaddr != l_new->ipaddr) {
925 l_old->ipaddr = l_new->ipaddr;
926 lease_delete_assignments(l_old, false);
927 }
928
929 if (l_old->hostid != l_new->hostid) {
930 l_old->hostid = l_new->hostid;
931 lease_delete_assignments(l_old, true);
932 }
933
934 if (update)
935 lease_update_assignments(l_old);
936
937 free_lease(l_new);
938 }
939
940 static void lease_delete(struct lease *l)
941 {
942 struct dhcp_assignment *a, *tmp;
943
944 list_for_each_entry_safe(a, tmp, &l->assignments, lease_list)
945 free_assignment(a);
946
947 free_lease(l);
948 }
949
950 static void lease_update(_unused struct vlist_tree *tree, struct vlist_node *node_new,
951 struct vlist_node *node_old)
952 {
953 struct lease *lease_new = container_of(node_new, struct lease, node);
954 struct lease *lease_old = container_of(node_old, struct lease, node);
955
956 if (node_old && node_new)
957 lease_change_config(lease_old, lease_new);
958 else if (node_old)
959 lease_delete(lease_old);
960 }
961
962 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len)
963 {
964 struct lease *l;
965
966 vlist_for_each_element(&leases, l, node) {
967 if (l->duid_len == len && !memcmp(l->duid, duid, len))
968 return l;
969 }
970
971 return NULL;
972 }
973
974 struct lease *config_find_lease_by_mac(const uint8_t *mac)
975 {
976 struct lease *l;
977
978 vlist_for_each_element(&leases, l, node) {
979 if (!memcmp(l->mac.ether_addr_octet, mac,
980 sizeof(l->mac.ether_addr_octet)))
981 return l;
982 }
983
984 return NULL;
985 }
986
987 struct lease *config_find_lease_by_hostid(const uint32_t hostid)
988 {
989 struct lease *l;
990
991 vlist_for_each_element(&leases, l, node) {
992 if (l->hostid == hostid)
993 return l;
994 }
995
996 return NULL;
997 }
998
999 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr)
1000 {
1001 struct lease *l;
1002
1003 vlist_for_each_element(&leases, l, node) {
1004 if (l->ipaddr == ipaddr)
1005 return l;
1006 }
1007
1008 return NULL;
1009 }
1010
1011 void odhcpd_reload(void)
1012 {
1013 struct uci_context *uci = uci_alloc_context();
1014 struct interface *master = NULL, *i, *tmp;
1015
1016 if (!uci)
1017 return;
1018
1019 vlist_update(&leases);
1020 avl_for_each_element(&interfaces, i, avl)
1021 clean_interface(i);
1022
1023 struct uci_package *dhcp = NULL;
1024 if (!uci_load(uci, "dhcp", &dhcp)) {
1025 struct uci_element *e;
1026
1027 /* 1. Global settings */
1028 uci_foreach_element(&dhcp->sections, e) {
1029 struct uci_section *s = uci_to_section(e);
1030 if (!strcmp(s->type, "odhcpd"))
1031 set_config(s);
1032 }
1033
1034 /* 2. DHCP pools */
1035 uci_foreach_element(&dhcp->sections, e) {
1036 struct uci_section *s = uci_to_section(e);
1037 if (!strcmp(s->type, "dhcp"))
1038 set_interface(s);
1039 }
1040
1041 /* 3. Static leases */
1042 uci_foreach_element(&dhcp->sections, e) {
1043 struct uci_section* s = uci_to_section(e);
1044 if (!strcmp(s->type, "host"))
1045 set_lease(s);
1046 }
1047 }
1048
1049 if (config.dhcp_statefile) {
1050 char *path = strdup(config.dhcp_statefile);
1051
1052 mkdir_p(dirname(path), 0755);
1053 free(path);
1054 }
1055
1056 vlist_flush(&leases);
1057
1058 #ifdef WITH_UBUS
1059 ubus_apply_network();
1060 #endif
1061
1062 bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
1063
1064 /* Test for */
1065 avl_for_each_element(&interfaces, i, avl) {
1066 if (i->master)
1067 continue;
1068
1069 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
1070 any_dhcpv6_slave = true;
1071
1072 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
1073 any_ra_slave = true;
1074
1075 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
1076 any_ndp_slave = true;
1077 }
1078
1079 /* Evaluate hybrid mode for master */
1080 avl_for_each_element(&interfaces, i, avl) {
1081 if (!i->master)
1082 continue;
1083
1084 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
1085 #ifdef WITH_UBUS
1086 if (!ubus_has_prefix(i->name, i->ifname))
1087 hybrid_mode = MODE_RELAY;
1088 #endif
1089
1090 if (i->dhcpv6 == MODE_HYBRID)
1091 i->dhcpv6 = hybrid_mode;
1092
1093 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
1094 i->dhcpv6 = MODE_DISABLED;
1095
1096 if (i->ra == MODE_HYBRID)
1097 i->ra = hybrid_mode;
1098
1099 if (i->ra == MODE_RELAY && !any_ra_slave)
1100 i->ra = MODE_DISABLED;
1101
1102 if (i->ndp == MODE_HYBRID)
1103 i->ndp = hybrid_mode;
1104
1105 if (i->ndp == MODE_RELAY && !any_ndp_slave)
1106 i->ndp = MODE_DISABLED;
1107
1108 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
1109 master = i;
1110 }
1111
1112
1113 avl_for_each_element_safe(&interfaces, i, avl, tmp) {
1114 if (i->inuse) {
1115 /* Resolve hybrid mode */
1116 if (i->dhcpv6 == MODE_HYBRID)
1117 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
1118 MODE_RELAY : MODE_SERVER;
1119
1120 if (i->ra == MODE_HYBRID)
1121 i->ra = (master && master->ra == MODE_RELAY) ?
1122 MODE_RELAY : MODE_SERVER;
1123
1124 if (i->ndp == MODE_HYBRID)
1125 i->ndp = (master && master->ndp == MODE_RELAY) ?
1126 MODE_RELAY : MODE_DISABLED;
1127
1128 router_setup_interface(i, i->ra != MODE_DISABLED);
1129 dhcpv6_setup_interface(i, i->dhcpv6 != MODE_DISABLED);
1130 ndp_setup_interface(i, i->ndp != MODE_DISABLED);
1131 #ifdef DHCPV4_SUPPORT
1132 dhcpv4_setup_interface(i, i->dhcpv4 != MODE_DISABLED);
1133 #endif
1134 } else
1135 close_interface(i);
1136 }
1137
1138 uci_unload(uci, dhcp);
1139 uci_free_context(uci);
1140 }
1141
1142 static void handle_signal(int signal)
1143 {
1144 char b[1] = {0};
1145
1146 if (signal == SIGHUP) {
1147 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
1148 } else
1149 uloop_end();
1150 }
1151
1152 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
1153 {
1154 char b[512];
1155 if (read(u->fd, b, sizeof(b)) < 0) {}
1156
1157 odhcpd_reload();
1158 }
1159
1160 static struct uloop_fd reload_fd = { .fd = -1, .cb = reload_cb };
1161
1162 void odhcpd_run(void)
1163 {
1164 if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
1165
1166 reload_fd.fd = reload_pipe[0];
1167 uloop_fd_add(&reload_fd, ULOOP_READ);
1168
1169 signal(SIGTERM, handle_signal);
1170 signal(SIGINT, handle_signal);
1171 signal(SIGHUP, handle_signal);
1172
1173 #ifdef WITH_UBUS
1174 while (ubus_init())
1175 sleep(1);
1176 #endif
1177
1178 odhcpd_reload();
1179 uloop_run();
1180 }
OpenWrt DHCP Server