Fix IPv6 DNS server adddress selection
[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
7 #include <uci.h>
8 #include <uci_blob.h>
9
10 #include "odhcpd.h"
11
12 static struct blob_buf b;
13 static int reload_pipe[2];
14 struct list_head leases = LIST_HEAD_INIT(leases);
15 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
16 struct config config = {false, NULL, NULL};
17
18 enum {
19         IFACE_ATTR_INTERFACE,
20         IFACE_ATTR_IFNAME,
21         IFACE_ATTR_NETWORKID,
22         IFACE_ATTR_DYNAMICDHCP,
23         IFACE_ATTR_IGNORE,
24         IFACE_ATTR_LEASETIME,
25         IFACE_ATTR_LIMIT,
26         IFACE_ATTR_START,
27         IFACE_ATTR_MASTER,
28         IFACE_ATTR_UPSTREAM,
29         IFACE_ATTR_RA,
30         IFACE_ATTR_DHCPV4,
31         IFACE_ATTR_DHCPV6,
32         IFACE_ATTR_NDP,
33         IFACE_ATTR_ROUTER,
34         IFACE_ATTR_DNS,
35         IFACE_ATTR_DOMAIN,
36         IFACE_ATTR_FILTER_CLASS,
37         IFACE_ATTR_DHCPV6_RAW,
38         IFACE_ATTR_RA_DEFAULT,
39         IFACE_ATTR_RA_MANAGEMENT,
40         IFACE_ATTR_RA_OFFLINK,
41         IFACE_ATTR_RA_PREFERENCE,
42         IFACE_ATTR_RA_ADVROUTER,
43         IFACE_ATTR_PD_MANAGER,
44         IFACE_ATTR_PD_CER,
45         IFACE_ATTR_NDPROXY_ROUTING,
46         IFACE_ATTR_NDPROXY_SLAVE,
47         IFACE_ATTR_MAX
48 };
49
50 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
51         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
52         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
53         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
54         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
55         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
56         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
57         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
58         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
59         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
60         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
61         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
62         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
63         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
64         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
65         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
66         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
67         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
68         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
69         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
70         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
71         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
72         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
73         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
74         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
75         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
76         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
77         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
78         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
79 };
80
81 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
82         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
83         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
84         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
85 };
86
87 const struct uci_blob_param_list interface_attr_list = {
88         .n_params = IFACE_ATTR_MAX,
89         .params = iface_attrs,
90         .info = iface_attr_info,
91 };
92
93
94 enum {
95         LEASE_ATTR_IP,
96         LEASE_ATTR_MAC,
97         LEASE_ATTR_DUID,
98         LEASE_ATTR_HOSTID,
99         LEASE_ATTR_NAME,
100         LEASE_ATTR_MAX
101 };
102
103
104 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
105         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
106         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
107         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
108         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
109         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
110 };
111
112
113 const struct uci_blob_param_list lease_attr_list = {
114         .n_params = LEASE_ATTR_MAX,
115         .params = lease_attrs,
116 };
117
118
119 enum {
120         ODHCPD_ATTR_MAINDHCP,
121         ODHCPD_ATTR_LEASEFILE,
122         ODHCPD_ATTR_LEASETRIGGER,
123         ODHCPD_ATTR_MAX
124 };
125
126
127 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
128         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
129         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
130         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
131 };
132
133
134 const struct uci_blob_param_list odhcpd_attr_list = {
135         .n_params = ODHCPD_ATTR_MAX,
136         .params = odhcpd_attrs,
137 };
138
139
140 static struct interface* get_interface(const char *name)
141 {
142         struct interface *c;
143         list_for_each_entry(c, &interfaces, head)
144                 if (!strcmp(c->name, name))
145                         return c;
146         return NULL;
147 }
148
149
150 static void clean_interface(struct interface *iface)
151 {
152         free(iface->dns);
153         free(iface->search);
154         free(iface->upstream);
155         free(iface->dhcpv4_router);
156         free(iface->dhcpv4_dns);
157         free(iface->dhcpv6_raw);
158         free(iface->filter_class);
159         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
160 }
161
162
163 static void close_interface(struct interface *iface)
164 {
165         if (iface->head.next)
166                 list_del(&iface->head);
167
168         setup_router_interface(iface, false);
169         setup_dhcpv6_interface(iface, false);
170         setup_ndp_interface(iface, false);
171         setup_dhcpv4_interface(iface, false);
172
173         clean_interface(iface);
174         free(iface);
175 }
176
177
178 static int parse_mode(const char *mode)
179 {
180         if (!strcmp(mode, "disabled")) {
181                 return RELAYD_DISABLED;
182         } else if (!strcmp(mode, "server")) {
183                 return RELAYD_SERVER;
184         } else if (!strcmp(mode, "relay")) {
185                 return RELAYD_RELAY;
186         } else if (!strcmp(mode, "hybrid")) {
187                 return RELAYD_HYBRID;
188         } else {
189                 return -1;
190         }
191 }
192
193
194 static void set_config(struct uci_section *s)
195 {
196         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
197
198         blob_buf_init(&b, 0);
199         uci_to_blob(&b, s, &odhcpd_attr_list);
200         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
201
202         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
203                 config.legacy = blobmsg_get_bool(c);
204
205         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
206                 free(config.dhcp_statefile);
207                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
208         }
209
210         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
211                 free(config.dhcp_cb);
212                 config.dhcp_cb = strdup(blobmsg_get_string(c));
213         }
214 }
215
216
217 static int set_lease(struct uci_section *s)
218 {
219         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
220
221         blob_buf_init(&b, 0);
222         uci_to_blob(&b, s, &lease_attr_list);
223         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
224
225         size_t hostlen = 1;
226         if ((c = tb[LEASE_ATTR_NAME]))
227                 hostlen = blobmsg_data_len(c);
228
229         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
230         if (!lease)
231                 goto err;
232
233         if (hostlen > 1)
234                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
235
236         if ((c = tb[LEASE_ATTR_IP]))
237                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
238                         goto err;
239
240         if ((c = tb[LEASE_ATTR_MAC]))
241                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
242                         goto err;
243
244         if ((c = tb[LEASE_ATTR_DUID])) {
245                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
246                 lease->duid = malloc(duidlen);
247                 if (!lease->duid)
248                         goto err;
249
250                 ssize_t len = odhcpd_unhexlify(lease->duid,
251                                 duidlen, blobmsg_get_string(c));
252
253                 if (len < 0)
254                         goto err;
255
256                 lease->duid_len = len;
257         }
258
259         if ((c = tb[LEASE_ATTR_HOSTID])) {
260                 errno = 0;
261                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
262                 if (errno)
263                         goto err;
264         }
265
266         list_add(&lease->head, &leases);
267         return 0;
268
269 err:
270         if (lease) {
271                 free(lease->duid);
272                 free(lease);
273         }
274         return -1;
275 }
276
277
278 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
279 {
280         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
281         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
282
283         if (tb[IFACE_ATTR_INTERFACE])
284                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
285
286         if (!name)
287                 return -1;
288
289         struct interface *iface = get_interface(name);
290         if (!iface) {
291                 iface = calloc(1, sizeof(*iface));
292                 if (!iface)
293                         return -1;
294
295                 strncpy(iface->name, name, sizeof(iface->name) - 1);
296                 list_add(&iface->head, &interfaces);
297                 overwrite = true;
298         }
299
300         const char *ifname = NULL;
301 #ifdef WITH_UBUS
302         if (overwrite || !iface->ifname[0])
303                 ifname = ubus_get_ifname(name);
304 #endif
305
306         if (overwrite) {
307                 if ((c = tb[IFACE_ATTR_IFNAME]))
308                         ifname = blobmsg_get_string(c);
309                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
310                         ifname = blobmsg_get_string(c);
311         }
312
313         if (!iface->ifname[0] && !ifname)
314                 return -1;
315
316         if (ifname)
317                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
318
319         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
320                 return -1;
321
322         iface->inuse = true;
323
324         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
325                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
326
327         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
328                 iface->ignore = blobmsg_get_bool(c);
329
330         if ((c = tb[IFACE_ATTR_LEASETIME])) {
331                 char *val = blobmsg_get_string(c), *endptr;
332                 double time = strtod(val, &endptr);
333                 if (time && endptr[0]) {
334                         if (endptr[0] == 's')
335                                 time *= 1;
336                         else if (endptr[0] == 'm')
337                                 time *= 60;
338                         else if (endptr[0] == 'h')
339                                 time *= 3600;
340                         else if (endptr[0] == 'd')
341                                 time *= 24 * 3600;
342                         else if (endptr[0] == 'w')
343                                 time *= 7 * 24 * 3600;
344                         else
345                                 goto err;
346                 }
347
348                 if (time >= 60)
349                         iface->dhcpv4_leasetime = time;
350         }
351
352         if ((c = tb[IFACE_ATTR_START])) {
353                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
354
355                 if (config.legacy)
356                         iface->dhcpv4 = RELAYD_SERVER;
357         }
358
359         if ((c = tb[IFACE_ATTR_LIMIT]))
360                 iface->dhcpv4_end.s_addr = htonl(
361                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
362
363         if ((c = tb[IFACE_ATTR_MASTER]))
364                 iface->master = blobmsg_get_bool(c);
365
366         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
367                 struct blob_attr *cur;
368                 unsigned rem;
369
370                 blobmsg_for_each_attr(cur, c, rem) {
371                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
372                                 continue;
373
374                         iface->upstream = realloc(iface->upstream,
375                                         iface->upstream_len + blobmsg_data_len(cur));
376                         if (!iface->upstream)
377                                 goto err;
378
379                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
380                         iface->upstream_len += blobmsg_data_len(cur);
381                 }
382         }
383
384         int mode;
385         if ((c = tb[IFACE_ATTR_RA])) {
386                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
387                         iface->ra = mode;
388                 else
389                         goto err;
390         }
391
392         if ((c = tb[IFACE_ATTR_DHCPV4])) {
393                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
394                         iface->dhcpv4 = mode;
395                 else
396                         goto err;
397         }
398
399         if ((c = tb[IFACE_ATTR_DHCPV6])) {
400                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
401                         iface->dhcpv6 = mode;
402                 else
403                         goto err;
404         }
405
406         if ((c = tb[IFACE_ATTR_NDP])) {
407                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
408                         iface->ndp = mode;
409                 else
410                         goto err;
411         }
412
413         if ((c = tb[IFACE_ATTR_ROUTER])) {
414                 struct blob_attr *cur;
415                 unsigned rem;
416
417                 blobmsg_for_each_attr(cur, c, rem) {
418                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
419                                 continue;
420
421                         struct in_addr addr4;
422                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
423                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
424                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
425                                 if (!iface->dhcpv4_router)
426                                         goto err;
427
428                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
429                         } else {
430                                 goto err;
431                         }
432                 }
433         }
434
435         if ((c = tb[IFACE_ATTR_DNS])) {
436                 struct blob_attr *cur;
437                 unsigned rem;
438
439                 iface->always_rewrite_dns = true;
440                 blobmsg_for_each_attr(cur, c, rem) {
441                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
442                                 continue;
443
444                         struct in_addr addr4;
445                         struct in6_addr addr6;
446                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
447                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
448                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
449                                 if (!iface->dhcpv4_dns)
450                                         goto err;
451
452                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
453                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
454                                 iface->dns = realloc(iface->dns,
455                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
456                                 if (!iface->dns)
457                                         goto err;
458
459                                 iface->dns[iface->dns_cnt - 1] = addr6;
460                         } else {
461                                 goto err;
462                         }
463                 }
464         }
465
466         if ((c = tb[IFACE_ATTR_DOMAIN])) {
467                 struct blob_attr *cur;
468                 unsigned rem;
469
470                 blobmsg_for_each_attr(cur, c, rem) {
471                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
472                                 continue;
473
474                         uint8_t buf[256];
475                         char *domain = blobmsg_get_string(cur);
476                         size_t domainlen = strlen(domain);
477                         if (domainlen > 0 && domain[domainlen - 1] == '.')
478                                 domain[domainlen - 1] = 0;
479
480                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
481                         if (len <= 0)
482                                 goto err;
483
484                         iface->search = realloc(iface->search, iface->search_len + len);
485                         if (!iface->search)
486                                 goto err;
487
488                         memcpy(&iface->search[iface->search_len], buf, len);
489                         iface->search_len += len;
490                 }
491         }
492
493         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
494                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
495                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
496         }
497
498         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
499                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
500                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
501                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
502         }
503
504         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
505                 iface->default_router = blobmsg_get_u32(c);
506
507         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
508                 iface->managed = blobmsg_get_u32(c);
509         else if (overwrite)
510                 iface->managed = 1;
511
512         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
513                 iface->ra_not_onlink = blobmsg_get_bool(c);
514
515         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
516                 iface->ra_advrouter = blobmsg_get_bool(c);
517
518         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
519                 const char *prio = blobmsg_get_string(c);
520
521                 if (!strcmp(prio, "high"))
522                         iface->route_preference = 1;
523                 else if (!strcmp(prio, "low"))
524                         iface->route_preference = -1;
525                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
526                         iface->route_preference = 0;
527                 else
528                         goto err;
529         }
530
531         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
532                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
533                                 sizeof(iface->dhcpv6_pd_manager) - 1);
534
535         if ((c = tb[IFACE_ATTR_PD_CER]) &&
536                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
537                 goto err;
538
539         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
540                 iface->learn_routes = blobmsg_get_bool(c);
541         else if (overwrite)
542                 iface->learn_routes = true;
543
544         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
545                 iface->external = blobmsg_get_bool(c);
546
547         return 0;
548
549 err:
550         close_interface(iface);
551         return -1;
552 }
553
554 static int set_interface(struct uci_section *s)
555 {
556         blob_buf_init(&b, 0);
557         uci_to_blob(&b, s, &interface_attr_list);
558         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
559 }
560
561
562 void odhcpd_reload(void)
563 {
564         struct uci_context *uci = uci_alloc_context();
565         while (!list_empty(&leases)) {
566                 struct lease *l = list_first_entry(&leases, struct lease, head);
567                 list_del(&l->head);
568                 free(l->duid);
569                 free(l);
570         }
571
572         struct interface *master = NULL, *i, *n;
573
574         if (!uci)
575                 return;
576
577         list_for_each_entry(i, &interfaces, head)
578                 clean_interface(i);
579
580         struct uci_package *dhcp = NULL;
581         if (!uci_load(uci, "dhcp", &dhcp)) {
582                 struct uci_element *e;
583                 uci_foreach_element(&dhcp->sections, e) {
584                         struct uci_section *s = uci_to_section(e);
585                         if (!strcmp(s->type, "host"))
586                                 set_lease(s);
587                         else if (!strcmp(s->type, "odhcpd"))
588                                 set_config(s);
589                 }
590
591                 uci_foreach_element(&dhcp->sections, e) {
592                         struct uci_section *s = uci_to_section(e);
593                         if (!strcmp(s->type, "dhcp"))
594                                 set_interface(s);
595                 }
596         }
597
598
599 #ifdef WITH_UBUS
600         ubus_apply_network();
601 #endif
602
603         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
604
605         // Test for
606         list_for_each_entry(i, &interfaces, head) {
607                 if (i->master)
608                         continue;
609
610                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
611                         any_dhcpv6_slave = true;
612
613                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
614                         any_ra_slave = true;
615
616                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
617                         any_ndp_slave = true;
618         }
619
620         // Evaluate hybrid mode for master
621         list_for_each_entry(i, &interfaces, head) {
622                 if (!i->master)
623                         continue;
624
625                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
626 #ifdef WITH_UBUS
627                 if (!ubus_has_prefix(i->name, i->ifname))
628                         hybrid_mode = RELAYD_RELAY;
629 #endif
630
631                 if (i->dhcpv6 == RELAYD_HYBRID)
632                         i->dhcpv6 = hybrid_mode;
633
634                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
635                         i->dhcpv6 = RELAYD_DISABLED;
636
637                 if (i->ra == RELAYD_HYBRID)
638                         i->ra = hybrid_mode;
639
640                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
641                         i->ra = RELAYD_DISABLED;
642
643                 if (i->ndp == RELAYD_HYBRID)
644                         i->ndp = hybrid_mode;
645
646                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
647                         i->ndp = RELAYD_DISABLED;
648
649                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
650                         master = i;
651         }
652
653
654         list_for_each_entry_safe(i, n, &interfaces, head) {
655                 if (i->inuse) {
656                         // Resolve hybrid mode
657                         if (i->dhcpv6 == RELAYD_HYBRID)
658                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
659                                                 RELAYD_RELAY : RELAYD_SERVER;
660
661                         if (i->ra == RELAYD_HYBRID)
662                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
663                                                 RELAYD_RELAY : RELAYD_SERVER;
664
665                         if (i->ndp == RELAYD_HYBRID)
666                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
667                                                 RELAYD_RELAY : RELAYD_DISABLED;
668
669                         setup_router_interface(i, true);
670                         setup_dhcpv6_interface(i, true);
671                         setup_ndp_interface(i, true);
672                         setup_dhcpv4_interface(i, true);
673                 } else {
674                         close_interface(i);
675                 }
676         }
677
678         uci_unload(uci, dhcp);
679         uci_free_context(uci);
680 }
681
682
683 static void handle_signal(int signal)
684 {
685         char b[1] = {0};
686         if (signal == SIGHUP)
687                 write(reload_pipe[1], b, sizeof(b));
688         else
689                 uloop_end();
690 }
691
692
693
694 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
695 {
696         char b[512];
697         read(u->fd, b, sizeof(b));
698         odhcpd_reload();
699 }
700
701 static struct uloop_fd reload_fd = { .cb = reload_cb };
702
703 void odhcpd_run(void)
704 {
705         pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC);
706         reload_fd.fd = reload_pipe[0];
707         uloop_fd_add(&reload_fd, ULOOP_READ);
708
709         signal(SIGTERM, handle_signal);
710         signal(SIGINT, handle_signal);
711         signal(SIGHUP, handle_signal);
712
713 #ifdef WITH_UBUS
714         while (init_ubus())
715                 sleep(1);
716 #endif
717
718         odhcpd_reload();
719         uloop_run();
720
721         while (!list_empty(&interfaces))
722                 close_interface(list_first_entry(&interfaces, struct interface, head));
723 }
724