DHCPv4: send DHCPNAK if requested addr != leased addr
[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_DNS,
34         IFACE_ATTR_DOMAIN,
35         IFACE_ATTR_FILTER_CLASS,
36         IFACE_ATTR_DHCPV6_RAW,
37         IFACE_ATTR_RA_DEFAULT,
38         IFACE_ATTR_RA_MANAGEMENT,
39         IFACE_ATTR_RA_OFFLINK,
40         IFACE_ATTR_RA_PREFERENCE,
41         IFACE_ATTR_PD_MANAGER,
42         IFACE_ATTR_PD_CER,
43         IFACE_ATTR_NDPROXY_ROUTING,
44         IFACE_ATTR_NDPROXY_SLAVE,
45         IFACE_ATTR_NDPROXY_STATIC,
46         IFACE_ATTR_MAX
47 };
48
49 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
50         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
51         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
52         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
53         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
54         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
55         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
56         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
57         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
58         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
59         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
60         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
61         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
62         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
63         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
64         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
65         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
66         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
67         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
68         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
69         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
70         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
71         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
72         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
73         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
74         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
75         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
76         [IFACE_ATTR_NDPROXY_STATIC] = { .name = "ndproxy_static", .type = BLOBMSG_TYPE_ARRAY },
77 };
78
79 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
80         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
81         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
82         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
83         [IFACE_ATTR_NDPROXY_STATIC] = { .type = BLOBMSG_TYPE_STRING },
84 };
85
86 const struct uci_blob_param_list interface_attr_list = {
87         .n_params = IFACE_ATTR_MAX,
88         .params = iface_attrs,
89         .info = iface_attr_info,
90 };
91
92
93 enum {
94         LEASE_ATTR_IP,
95         LEASE_ATTR_MAC,
96         LEASE_ATTR_DUID,
97         LEASE_ATTR_HOSTID,
98         LEASE_ATTR_NAME,
99         LEASE_ATTR_MAX
100 };
101
102
103 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
104         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
105         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
106         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
107         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
108         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
109 };
110
111
112 const struct uci_blob_param_list lease_attr_list = {
113         .n_params = LEASE_ATTR_MAX,
114         .params = lease_attrs,
115 };
116
117
118 enum {
119         ODHCPD_ATTR_MAINDHCP,
120         ODHCPD_ATTR_LEASEFILE,
121         ODHCPD_ATTR_LEASETRIGGER,
122         ODHCPD_ATTR_MAX
123 };
124
125
126 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
127         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
128         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
129         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
130 };
131
132
133 const struct uci_blob_param_list odhcpd_attr_list = {
134         .n_params = ODHCPD_ATTR_MAX,
135         .params = odhcpd_attrs,
136 };
137
138
139 static struct interface* get_interface(const char *name)
140 {
141         struct interface *c;
142         list_for_each_entry(c, &interfaces, head)
143                 if (!strcmp(c->name, name))
144                         return c;
145         return NULL;
146 }
147
148
149 static void clean_interface(struct interface *iface)
150 {
151         free(iface->dns);
152         free(iface->search);
153         free(iface->upstream);
154         free(iface->static_ndp);
155         free(iface->dhcpv4_dns);
156         free(iface->dhcpv6_raw);
157         free(iface->filter_class);
158         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
159 }
160
161
162 static void close_interface(struct interface *iface)
163 {
164         if (iface->head.next)
165                 list_del(&iface->head);
166
167         setup_router_interface(iface, false);
168         setup_dhcpv6_interface(iface, false);
169         setup_ndp_interface(iface, false);
170         setup_dhcpv4_interface(iface, false);
171
172         clean_interface(iface);
173         free(iface);
174 }
175
176
177 static int parse_mode(const char *mode)
178 {
179         if (!strcmp(mode, "disabled")) {
180                 return RELAYD_DISABLED;
181         } else if (!strcmp(mode, "server")) {
182                 return RELAYD_SERVER;
183         } else if (!strcmp(mode, "relay")) {
184                 return RELAYD_RELAY;
185         } else if (!strcmp(mode, "hybrid")) {
186                 return RELAYD_HYBRID;
187         } else {
188                 return -1;
189         }
190 }
191
192
193 static void set_config(struct uci_section *s)
194 {
195         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
196
197         blob_buf_init(&b, 0);
198         uci_to_blob(&b, s, &odhcpd_attr_list);
199         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
200
201         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
202                 config.legacy = blobmsg_get_bool(c);
203
204         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
205                 free(config.dhcp_statefile);
206                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
207         }
208
209         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
210                 free(config.dhcp_cb);
211                 config.dhcp_cb = strdup(blobmsg_get_string(c));
212         }
213 }
214
215
216 static int set_lease(struct uci_section *s)
217 {
218         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
219
220         blob_buf_init(&b, 0);
221         uci_to_blob(&b, s, &lease_attr_list);
222         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
223
224         size_t hostlen = 1;
225         if ((c = tb[LEASE_ATTR_NAME]))
226                 hostlen = blobmsg_data_len(c);
227
228         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
229         if (!lease)
230                 goto err;
231
232         if (hostlen > 1)
233                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
234
235         if ((c = tb[LEASE_ATTR_IP]))
236                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
237                         goto err;
238
239         if ((c = tb[LEASE_ATTR_MAC]))
240                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
241                         goto err;
242
243         if ((c = tb[LEASE_ATTR_DUID])) {
244                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
245                 lease->duid = malloc(duidlen);
246                 if (!lease->duid)
247                         goto err;
248
249                 ssize_t len = odhcpd_unhexlify(lease->duid,
250                                 duidlen, blobmsg_get_string(c));
251
252                 if (len < 0)
253                         goto err;
254
255                 lease->duid_len = len;
256         }
257
258         if ((c = tb[LEASE_ATTR_HOSTID])) {
259                 errno = 0;
260                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
261                 if (errno)
262                         goto err;
263         }
264
265         list_add(&lease->head, &leases);
266         return 0;
267
268 err:
269         if (lease) {
270                 free(lease->duid);
271                 free(lease);
272         }
273         return -1;
274 }
275
276
277 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
278 {
279         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
280         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
281
282         if (tb[IFACE_ATTR_INTERFACE])
283                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
284
285         if (!name)
286                 return -1;
287
288         struct interface *iface = get_interface(name);
289         if (!iface) {
290                 iface = calloc(1, sizeof(*iface));
291                 if (!iface)
292                         return -1;
293
294                 strncpy(iface->name, name, sizeof(iface->name) - 1);
295                 list_add(&iface->head, &interfaces);
296                 overwrite = true;
297         }
298
299         const char *ifname = NULL;
300 #ifdef WITH_UBUS
301         if (overwrite || !iface->ifname[0])
302                 ifname = ubus_get_ifname(name);
303 #endif
304
305         if (overwrite) {
306                 if ((c = tb[IFACE_ATTR_IFNAME]))
307                         ifname = blobmsg_get_string(c);
308                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
309                         ifname = blobmsg_get_string(c);
310         }
311
312         if (!iface->ifname[0] && !ifname)
313                 return -1;
314
315         if (ifname)
316                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
317
318         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
319                 return -1;
320
321         iface->inuse = true;
322
323         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
324                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
325
326         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
327                 iface->ignore = blobmsg_get_bool(c);
328
329         if ((c = tb[IFACE_ATTR_LEASETIME])) {
330                 char *val = blobmsg_get_string(c), *endptr;
331                 double time = strtod(val, &endptr);
332                 if (time && endptr[0]) {
333                         if (endptr[0] == 's')
334                                 time *= 1;
335                         else if (endptr[0] == 'm')
336                                 time *= 60;
337                         else if (endptr[0] == 'h')
338                                 time *= 3600;
339                         else if (endptr[0] == 'd')
340                                 time *= 24 * 3600;
341                         else if (endptr[0] == 'w')
342                                 time *= 7 * 24 * 3600;
343                         else
344                                 goto err;
345                 }
346
347                 if (time >= 60)
348                         iface->dhcpv4_leasetime = time;
349         }
350
351         if ((c = tb[IFACE_ATTR_START])) {
352                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
353
354                 if (config.legacy)
355                         iface->dhcpv4 = RELAYD_SERVER;
356         }
357
358         if ((c = tb[IFACE_ATTR_LIMIT]))
359                 iface->dhcpv4_end.s_addr = htonl(
360                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
361
362         if ((c = tb[IFACE_ATTR_MASTER]))
363                 iface->master = blobmsg_get_bool(c);
364
365         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
366                 struct blob_attr *cur;
367                 unsigned rem;
368
369                 blobmsg_for_each_attr(cur, c, rem) {
370                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
371                                 continue;
372
373                         iface->upstream = realloc(iface->upstream,
374                                         iface->upstream_len + blobmsg_data_len(cur));
375                         if (!iface->upstream)
376                                 goto err;
377
378                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
379                         iface->upstream_len += blobmsg_data_len(cur);
380                 }
381         }
382
383         int mode;
384         if ((c = tb[IFACE_ATTR_RA])) {
385                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
386                         iface->ra = mode;
387                 else
388                         goto err;
389         }
390
391         if ((c = tb[IFACE_ATTR_DHCPV4])) {
392                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
393                         iface->dhcpv4 = mode;
394                 else
395                         goto err;
396         }
397
398         if ((c = tb[IFACE_ATTR_DHCPV6])) {
399                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
400                         iface->dhcpv6 = mode;
401                 else
402                         goto err;
403         }
404
405         if ((c = tb[IFACE_ATTR_NDP])) {
406                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
407                         iface->ndp = mode;
408                 else
409                         goto err;
410         }
411
412         if ((c = tb[IFACE_ATTR_DNS])) {
413                 struct blob_attr *cur;
414                 unsigned rem;
415
416                 iface->always_rewrite_dns = true;
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                         struct in6_addr addr6;
423                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
424                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
425                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
426                                 if (!iface->dhcpv4_dns)
427                                         goto err;
428
429                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
430                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
431                                 iface->dns = realloc(iface->dns,
432                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
433                                 if (!iface->dns)
434                                         goto err;
435
436                                 iface->dns[iface->dns_cnt - 1] = addr6;
437                         } else {
438                                 goto err;
439                         }
440                 }
441         }
442
443         if ((c = tb[IFACE_ATTR_DOMAIN])) {
444                 struct blob_attr *cur;
445                 unsigned rem;
446
447                 blobmsg_for_each_attr(cur, c, rem) {
448                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
449                                 continue;
450
451                         uint8_t buf[256];
452                         char *domain = blobmsg_get_string(cur);
453                         size_t domainlen = strlen(domain);
454                         if (domainlen > 0 && domain[domainlen - 1] == '.')
455                                 domain[domainlen - 1] = 0;
456
457                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
458                         free(domain);
459                         if (len <= 0)
460                                 goto err;
461
462                         iface->search = realloc(iface->search, iface->search_len + len);
463                         if (!iface->search)
464                                 goto err;
465
466                         memcpy(&iface->search[iface->search_len], buf, len);
467                         iface->search_len += len;
468                 }
469         }
470
471         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
472                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
473                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
474         }
475
476         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
477                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
478                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
479                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
480         }
481
482         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
483                 iface->default_router = blobmsg_get_u32(c);
484
485         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
486                 iface->managed = blobmsg_get_u32(c);
487         else if (overwrite)
488                 iface->managed = 1;
489
490         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
491                 iface->ra_not_onlink = blobmsg_get_bool(c);
492
493         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
494                 const char *prio = blobmsg_get_string(c);
495
496                 if (!strcmp(prio, "high"))
497                         iface->route_preference = 1;
498                 else if (!strcmp(prio, "low"))
499                         iface->route_preference = -1;
500                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
501                         iface->route_preference = 0;
502                 else
503                         goto err;
504         }
505
506         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
507                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
508                                 sizeof(iface->dhcpv6_pd_manager) - 1);
509
510         if ((c = tb[IFACE_ATTR_PD_CER]) &&
511                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
512                 goto err;
513
514         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
515                 iface->learn_routes = blobmsg_get_bool(c);
516         else if (overwrite)
517                 iface->learn_routes = true;
518
519         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
520                 iface->external = blobmsg_get_bool(c);
521
522         if ((c = tb[IFACE_ATTR_NDPROXY_STATIC])) {
523                 struct blob_attr *cur;
524                 unsigned rem;
525
526                 blobmsg_for_each_attr(cur, c, rem) {
527                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
528                                 continue;
529
530                         int len = blobmsg_data_len(cur);
531                         iface->static_ndp = realloc(iface->static_ndp, iface->static_ndp_len + len);
532                         if (!iface->static_ndp)
533                                 goto err;
534
535                         if (iface->static_ndp_len)
536                                 iface->static_ndp[iface->static_ndp_len - 1] = ' ';
537
538                         memcpy(&iface->static_ndp[iface->static_ndp_len], blobmsg_get_string(cur), len);
539                         iface->static_ndp_len += len;
540                 }
541         }
542
543         return 0;
544
545 err:
546         close_interface(iface);
547         return -1;
548 }
549
550 static int set_interface(struct uci_section *s)
551 {
552         blob_buf_init(&b, 0);
553         uci_to_blob(&b, s, &interface_attr_list);
554         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
555 }
556
557
558 void odhcpd_reload(void)
559 {
560         struct uci_context *uci = uci_alloc_context();
561         while (!list_empty(&leases)) {
562                 struct lease *l = list_first_entry(&leases, struct lease, head);
563                 list_del(&l->head);
564                 free(l->duid);
565                 free(l);
566         }
567
568         struct interface *master = NULL, *i, *n;
569
570         if (!uci)
571                 return;
572
573         list_for_each_entry(i, &interfaces, head)
574                 clean_interface(i);
575
576         struct uci_package *dhcp = NULL;
577         if (!uci_load(uci, "dhcp", &dhcp)) {
578                 struct uci_element *e;
579                 uci_foreach_element(&dhcp->sections, e) {
580                         struct uci_section *s = uci_to_section(e);
581                         if (!strcmp(s->type, "host"))
582                                 set_lease(s);
583                         else if (!strcmp(s->type, "odhcpd"))
584                                 set_config(s);
585                 }
586
587                 uci_foreach_element(&dhcp->sections, e) {
588                         struct uci_section *s = uci_to_section(e);
589                         if (!strcmp(s->type, "dhcp"))
590                                 set_interface(s);
591                 }
592         }
593
594
595 #ifdef WITH_UBUS
596         ubus_apply_network();
597 #endif
598
599         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
600
601         // Test for
602         list_for_each_entry(i, &interfaces, head) {
603                 if (i->master)
604                         continue;
605
606                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
607                         any_dhcpv6_slave = true;
608
609                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
610                         any_ra_slave = true;
611
612                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
613                         any_ndp_slave = true;
614         }
615
616         // Evaluate hybrid mode for master
617         list_for_each_entry(i, &interfaces, head) {
618                 if (!i->master)
619                         continue;
620
621                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
622 #ifdef WITH_UBUS
623                 if (!ubus_has_prefix(i->name, i->ifname))
624                         hybrid_mode = RELAYD_RELAY;
625 #endif
626
627                 if (i->dhcpv6 == RELAYD_HYBRID)
628                         i->dhcpv6 = hybrid_mode;
629
630                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
631                         i->dhcpv6 = RELAYD_DISABLED;
632
633                 if (i->ra == RELAYD_HYBRID)
634                         i->ra = hybrid_mode;
635
636                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
637                         i->ra = RELAYD_DISABLED;
638
639                 if (i->ndp == RELAYD_HYBRID)
640                         i->ndp = hybrid_mode;
641
642                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
643                         i->ndp = RELAYD_DISABLED;
644
645                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
646                         master = i;
647         }
648
649
650         list_for_each_entry_safe(i, n, &interfaces, head) {
651                 if (i->inuse) {
652                         // Resolve hybrid mode
653                         if (i->dhcpv6 == RELAYD_HYBRID)
654                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
655                                                 RELAYD_RELAY : RELAYD_SERVER;
656
657                         if (i->ra == RELAYD_HYBRID)
658                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
659                                                 RELAYD_RELAY : RELAYD_SERVER;
660
661                         if (i->ndp == RELAYD_HYBRID)
662                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
663                                                 RELAYD_RELAY : RELAYD_DISABLED;
664
665                         setup_router_interface(i, true);
666                         setup_dhcpv6_interface(i, true);
667                         setup_ndp_interface(i, true);
668                         setup_dhcpv4_interface(i, true);
669                 } else {
670                         close_interface(i);
671                 }
672         }
673
674         uci_unload(uci, dhcp);
675         uci_free_context(uci);
676 }
677
678
679 static void handle_signal(int signal)
680 {
681         char b[1] = {0};
682         if (signal == SIGHUP)
683                 write(reload_pipe[1], b, sizeof(b));
684         else
685                 uloop_end();
686 }
687
688
689
690 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
691 {
692         char b[512];
693         read(u->fd, b, sizeof(b));
694         odhcpd_reload();
695 }
696
697 static struct uloop_fd reload_fd = { .cb = reload_cb };
698
699 void odhcpd_run(void)
700 {
701         pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC);
702         reload_fd.fd = reload_pipe[0];
703         uloop_fd_add(&reload_fd, ULOOP_READ);
704
705         signal(SIGTERM, handle_signal);
706         signal(SIGINT, handle_signal);
707         signal(SIGHUP, handle_signal);
708
709 #ifdef WITH_UBUS
710         while (init_ubus())
711                 sleep(1);
712 #endif
713
714         odhcpd_reload();
715         uloop_run();
716 }
717