dhcpv4: Keep DHCPv4 assignment lifetime value in sync with assigned leasetime
[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_RA_MAXINTERVAL,
44         IFACE_ATTR_PD_MANAGER,
45         IFACE_ATTR_PD_CER,
46         IFACE_ATTR_NDPROXY_ROUTING,
47         IFACE_ATTR_NDPROXY_SLAVE,
48         IFACE_ATTR_MAX
49 };
50
51 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
52         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
53         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
54         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
55         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
56         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
57         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
58         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
59         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
60         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
61         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
62         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
63         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
64         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
65         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
66         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
67         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
68         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
69         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
70         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
71         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
72         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
73         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
74         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
75         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
76         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
77         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
78         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
79         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
80         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
81 };
82
83 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
84         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
85         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
86         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
87 };
88
89 const struct uci_blob_param_list interface_attr_list = {
90         .n_params = IFACE_ATTR_MAX,
91         .params = iface_attrs,
92         .info = iface_attr_info,
93 };
94
95
96 enum {
97         LEASE_ATTR_IP,
98         LEASE_ATTR_MAC,
99         LEASE_ATTR_DUID,
100         LEASE_ATTR_HOSTID,
101         LEASE_ATTR_LEASETIME,
102         LEASE_ATTR_NAME,
103         LEASE_ATTR_MAX
104 };
105
106
107 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
108         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
109         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
110         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
111         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
112         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
113         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
114 };
115
116
117 const struct uci_blob_param_list lease_attr_list = {
118         .n_params = LEASE_ATTR_MAX,
119         .params = lease_attrs,
120 };
121
122
123 enum {
124         ODHCPD_ATTR_MAINDHCP,
125         ODHCPD_ATTR_LEASEFILE,
126         ODHCPD_ATTR_LEASETRIGGER,
127         ODHCPD_ATTR_MAX
128 };
129
130
131 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
132         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
133         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
134         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
135 };
136
137
138 const struct uci_blob_param_list odhcpd_attr_list = {
139         .n_params = ODHCPD_ATTR_MAX,
140         .params = odhcpd_attrs,
141 };
142
143
144 static struct interface* get_interface(const char *name)
145 {
146         struct interface *c;
147         list_for_each_entry(c, &interfaces, head)
148                 if (!strcmp(c->name, name))
149                         return c;
150         return NULL;
151 }
152
153
154 static void clean_interface(struct interface *iface)
155 {
156         free(iface->dns);
157         free(iface->search);
158         free(iface->upstream);
159         free(iface->dhcpv4_router);
160         free(iface->dhcpv4_dns);
161         free(iface->dhcpv6_raw);
162         free(iface->filter_class);
163         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
164 }
165
166
167 static void close_interface(struct interface *iface)
168 {
169         if (iface->head.next)
170                 list_del(&iface->head);
171
172         setup_router_interface(iface, false);
173         setup_dhcpv6_interface(iface, false);
174         setup_ndp_interface(iface, false);
175         setup_dhcpv4_interface(iface, false);
176
177         clean_interface(iface);
178         free(iface);
179 }
180
181
182 static int parse_mode(const char *mode)
183 {
184         if (!strcmp(mode, "disabled")) {
185                 return RELAYD_DISABLED;
186         } else if (!strcmp(mode, "server")) {
187                 return RELAYD_SERVER;
188         } else if (!strcmp(mode, "relay")) {
189                 return RELAYD_RELAY;
190         } else if (!strcmp(mode, "hybrid")) {
191                 return RELAYD_HYBRID;
192         } else {
193                 return -1;
194         }
195 }
196
197
198 static void set_config(struct uci_section *s)
199 {
200         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
201
202         blob_buf_init(&b, 0);
203         uci_to_blob(&b, s, &odhcpd_attr_list);
204         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
205
206         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
207                 config.legacy = blobmsg_get_bool(c);
208
209         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
210                 free(config.dhcp_statefile);
211                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
212         }
213
214         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
215                 free(config.dhcp_cb);
216                 config.dhcp_cb = strdup(blobmsg_get_string(c));
217         }
218 }
219
220 static double parse_leasetime(struct blob_attr *c) {
221         char *val = blobmsg_get_string(c), *endptr = NULL;
222         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
223
224         if (time && endptr && endptr[0]) {
225                 if (endptr[0] == 's')
226                         time *= 1;
227                 else if (endptr[0] == 'm')
228                         time *= 60;
229                 else if (endptr[0] == 'h')
230                         time *= 3600;
231                 else if (endptr[0] == 'd')
232                         time *= 24 * 3600;
233                 else if (endptr[0] == 'w')
234                         time *= 7 * 24 * 3600;
235                 else
236                         goto err;
237         }
238
239         if (time >= 60)
240                 return time;
241
242         return 0;
243
244 err:
245         return -1;
246 }
247
248 static int set_lease(struct uci_section *s)
249 {
250         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
251
252         blob_buf_init(&b, 0);
253         uci_to_blob(&b, s, &lease_attr_list);
254         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
255
256         size_t hostlen = 1;
257         if ((c = tb[LEASE_ATTR_NAME]))
258                 hostlen = blobmsg_data_len(c);
259
260         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
261         if (!lease)
262                 goto err;
263
264         if (hostlen > 1)
265                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
266
267         if ((c = tb[LEASE_ATTR_IP]))
268                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
269                         goto err;
270
271         if ((c = tb[LEASE_ATTR_MAC]))
272                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
273                         goto err;
274
275         if ((c = tb[LEASE_ATTR_DUID])) {
276                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
277                 lease->duid = malloc(duidlen);
278                 if (!lease->duid)
279                         goto err;
280
281                 ssize_t len = odhcpd_unhexlify(lease->duid,
282                                 duidlen, blobmsg_get_string(c));
283
284                 if (len < 0)
285                         goto err;
286
287                 lease->duid_len = len;
288         }
289
290         if ((c = tb[LEASE_ATTR_HOSTID])) {
291                 errno = 0;
292                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
293                 if (errno)
294                         goto err;
295         }
296
297         if ((c = tb[LEASE_ATTR_LEASETIME])) {
298                 double time = parse_leasetime(c);
299                 if (time < 0)
300                         goto err;
301
302                 if (time >= 60)
303                         lease->dhcpv4_leasetime = time;
304         }
305
306         list_add(&lease->head, &leases);
307         return 0;
308
309 err:
310         if (lease) {
311                 free(lease->duid);
312                 free(lease);
313         }
314         return -1;
315 }
316
317
318 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
319 {
320         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
321         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
322
323         if (tb[IFACE_ATTR_INTERFACE])
324                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
325
326         if (!name)
327                 return -1;
328
329         struct interface *iface = get_interface(name);
330         if (!iface) {
331                 iface = calloc(1, sizeof(*iface));
332                 if (!iface)
333                         return -1;
334
335                 strncpy(iface->name, name, sizeof(iface->name) - 1);
336                 list_add(&iface->head, &interfaces);
337                 overwrite = true;
338         }
339
340         const char *ifname = NULL;
341         if (overwrite) {
342                 if ((c = tb[IFACE_ATTR_IFNAME]))
343                         ifname = blobmsg_get_string(c);
344                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
345                         ifname = blobmsg_get_string(c);
346         }
347
348 #ifdef WITH_UBUS
349         if (overwrite || !iface->ifname[0])
350                 ifname = ubus_get_ifname(name);
351 #endif
352
353         if (!iface->ifname[0] && !ifname)
354                 goto err;
355
356         if (ifname)
357                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
358
359         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
360                 goto err;
361
362         iface->inuse = true;
363
364         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
365                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
366
367         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
368                 iface->ignore = blobmsg_get_bool(c);
369
370         if ((c = tb[IFACE_ATTR_LEASETIME])) {
371                 double time = parse_leasetime(c);
372                 if (time < 0)
373                         goto err;
374
375                 if (time >= 60)
376                         iface->dhcpv4_leasetime = time;
377         }
378
379         if ((c = tb[IFACE_ATTR_START])) {
380                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
381
382                 if (config.legacy)
383                         iface->dhcpv4 = RELAYD_SERVER;
384         }
385
386         if ((c = tb[IFACE_ATTR_LIMIT]))
387                 iface->dhcpv4_end.s_addr = htonl(
388                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
389
390         if ((c = tb[IFACE_ATTR_MASTER]))
391                 iface->master = blobmsg_get_bool(c);
392
393         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
394                 struct blob_attr *cur;
395                 unsigned rem;
396
397                 blobmsg_for_each_attr(cur, c, rem) {
398                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
399                                 continue;
400
401                         iface->upstream = realloc(iface->upstream,
402                                         iface->upstream_len + blobmsg_data_len(cur));
403                         if (!iface->upstream)
404                                 goto err;
405
406                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
407                         iface->upstream_len += blobmsg_data_len(cur);
408                 }
409         }
410
411         int mode;
412         if ((c = tb[IFACE_ATTR_RA])) {
413                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
414                         iface->ra = mode;
415                 else
416                         goto err;
417         }
418
419         if ((c = tb[IFACE_ATTR_DHCPV4])) {
420                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
421                         iface->dhcpv4 = mode;
422                 else
423                         goto err;
424         }
425
426         if ((c = tb[IFACE_ATTR_DHCPV6])) {
427                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
428                         iface->dhcpv6 = mode;
429                 else
430                         goto err;
431         }
432
433         if ((c = tb[IFACE_ATTR_NDP])) {
434                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
435                         iface->ndp = mode;
436                 else
437                         goto err;
438         }
439
440         if ((c = tb[IFACE_ATTR_ROUTER])) {
441                 struct blob_attr *cur;
442                 unsigned rem;
443
444                 blobmsg_for_each_attr(cur, c, rem) {
445                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
446                                 continue;
447
448                         struct in_addr addr4;
449                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
450                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
451                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
452                                 if (!iface->dhcpv4_router)
453                                         goto err;
454
455                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
456                         } else {
457                                 goto err;
458                         }
459                 }
460         }
461
462         if ((c = tb[IFACE_ATTR_DNS])) {
463                 struct blob_attr *cur;
464                 unsigned rem;
465
466                 iface->always_rewrite_dns = true;
467                 blobmsg_for_each_attr(cur, c, rem) {
468                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
469                                 continue;
470
471                         struct in_addr addr4;
472                         struct in6_addr addr6;
473                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
474                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
475                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
476                                 if (!iface->dhcpv4_dns)
477                                         goto err;
478
479                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
480                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
481                                 iface->dns = realloc(iface->dns,
482                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
483                                 if (!iface->dns)
484                                         goto err;
485
486                                 iface->dns[iface->dns_cnt - 1] = addr6;
487                         } else {
488                                 goto err;
489                         }
490                 }
491         }
492
493         if ((c = tb[IFACE_ATTR_DOMAIN])) {
494                 struct blob_attr *cur;
495                 unsigned rem;
496
497                 blobmsg_for_each_attr(cur, c, rem) {
498                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
499                                 continue;
500
501                         uint8_t buf[256];
502                         char *domain = blobmsg_get_string(cur);
503                         size_t domainlen = strlen(domain);
504                         if (domainlen > 0 && domain[domainlen - 1] == '.')
505                                 domain[domainlen - 1] = 0;
506
507                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
508                         if (len <= 0)
509                                 goto err;
510
511                         iface->search = realloc(iface->search, iface->search_len + len);
512                         if (!iface->search)
513                                 goto err;
514
515                         memcpy(&iface->search[iface->search_len], buf, len);
516                         iface->search_len += len;
517                 }
518         }
519
520         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
521                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
522                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
523         }
524
525         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
526                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
527                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
528                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
529         }
530
531         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
532                 iface->default_router = blobmsg_get_u32(c);
533
534         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
535                 iface->managed = blobmsg_get_u32(c);
536         else if (overwrite)
537                 iface->managed = 1;
538
539         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
540                 iface->ra_not_onlink = blobmsg_get_bool(c);
541
542         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
543                 iface->ra_advrouter = blobmsg_get_bool(c);
544
545         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
546                 iface->ra_maxinterval = blobmsg_get_u32(c);
547
548         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
549                 const char *prio = blobmsg_get_string(c);
550
551                 if (!strcmp(prio, "high"))
552                         iface->route_preference = 1;
553                 else if (!strcmp(prio, "low"))
554                         iface->route_preference = -1;
555                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
556                         iface->route_preference = 0;
557                 else
558                         goto err;
559         }
560
561         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
562                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
563                                 sizeof(iface->dhcpv6_pd_manager) - 1);
564
565         if ((c = tb[IFACE_ATTR_PD_CER]) &&
566                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
567                 goto err;
568
569         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
570                 iface->learn_routes = blobmsg_get_bool(c);
571         else if (overwrite)
572                 iface->learn_routes = true;
573
574         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
575                 iface->external = blobmsg_get_bool(c);
576
577         return 0;
578
579 err:
580         close_interface(iface);
581         return -1;
582 }
583
584 static int set_interface(struct uci_section *s)
585 {
586         blob_buf_init(&b, 0);
587         uci_to_blob(&b, s, &interface_attr_list);
588         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
589 }
590
591
592 void odhcpd_reload(void)
593 {
594         struct uci_context *uci = uci_alloc_context();
595         while (!list_empty(&leases)) {
596                 struct lease *l = list_first_entry(&leases, struct lease, head);
597                 list_del(&l->head);
598                 free(l->duid);
599                 free(l);
600         }
601
602         struct interface *master = NULL, *i, *n;
603
604         if (!uci)
605                 return;
606
607         list_for_each_entry(i, &interfaces, head)
608                 clean_interface(i);
609
610         struct uci_package *dhcp = NULL;
611         if (!uci_load(uci, "dhcp", &dhcp)) {
612                 struct uci_element *e;
613                 uci_foreach_element(&dhcp->sections, e) {
614                         struct uci_section *s = uci_to_section(e);
615                         if (!strcmp(s->type, "host"))
616                                 set_lease(s);
617                         else if (!strcmp(s->type, "odhcpd"))
618                                 set_config(s);
619                 }
620
621                 uci_foreach_element(&dhcp->sections, e) {
622                         struct uci_section *s = uci_to_section(e);
623                         if (!strcmp(s->type, "dhcp"))
624                                 set_interface(s);
625                 }
626         }
627
628
629 #ifdef WITH_UBUS
630         ubus_apply_network();
631 #endif
632
633         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
634
635         // Test for
636         list_for_each_entry(i, &interfaces, head) {
637                 if (i->master)
638                         continue;
639
640                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
641                         any_dhcpv6_slave = true;
642
643                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
644                         any_ra_slave = true;
645
646                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
647                         any_ndp_slave = true;
648         }
649
650         // Evaluate hybrid mode for master
651         list_for_each_entry(i, &interfaces, head) {
652                 if (!i->master)
653                         continue;
654
655                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
656 #ifdef WITH_UBUS
657                 if (!ubus_has_prefix(i->name, i->ifname))
658                         hybrid_mode = RELAYD_RELAY;
659 #endif
660
661                 if (i->dhcpv6 == RELAYD_HYBRID)
662                         i->dhcpv6 = hybrid_mode;
663
664                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
665                         i->dhcpv6 = RELAYD_DISABLED;
666
667                 if (i->ra == RELAYD_HYBRID)
668                         i->ra = hybrid_mode;
669
670                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
671                         i->ra = RELAYD_DISABLED;
672
673                 if (i->ndp == RELAYD_HYBRID)
674                         i->ndp = hybrid_mode;
675
676                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
677                         i->ndp = RELAYD_DISABLED;
678
679                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
680                         master = i;
681         }
682
683
684         list_for_each_entry_safe(i, n, &interfaces, head) {
685                 if (i->inuse) {
686                         // Resolve hybrid mode
687                         if (i->dhcpv6 == RELAYD_HYBRID)
688                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
689                                                 RELAYD_RELAY : RELAYD_SERVER;
690
691                         if (i->ra == RELAYD_HYBRID)
692                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
693                                                 RELAYD_RELAY : RELAYD_SERVER;
694
695                         if (i->ndp == RELAYD_HYBRID)
696                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
697                                                 RELAYD_RELAY : RELAYD_DISABLED;
698
699                         setup_router_interface(i, true);
700                         setup_dhcpv6_interface(i, true);
701                         setup_ndp_interface(i, true);
702                         setup_dhcpv4_interface(i, true);
703                 } else {
704                         close_interface(i);
705                 }
706         }
707
708         uci_unload(uci, dhcp);
709         uci_free_context(uci);
710 }
711
712
713 static void handle_signal(int signal)
714 {
715         char b[1] = {0};
716
717         if (signal == SIGHUP) {
718                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
719         } else
720                 uloop_end();
721 }
722
723
724
725 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
726 {
727         char b[512];
728         if (read(u->fd, b, sizeof(b)) < 0) {}
729         odhcpd_reload();
730 }
731
732 static struct uloop_fd reload_fd = { .cb = reload_cb };
733
734 void odhcpd_run(void)
735 {
736         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
737         reload_fd.fd = reload_pipe[0];
738         uloop_fd_add(&reload_fd, ULOOP_READ);
739
740         signal(SIGTERM, handle_signal);
741         signal(SIGINT, handle_signal);
742         signal(SIGHUP, handle_signal);
743
744 #ifdef WITH_UBUS
745         while (init_ubus())
746                 sleep(1);
747 #endif
748
749         odhcpd_reload();
750         uloop_run();
751
752         while (!list_empty(&interfaces))
753                 close_interface(list_first_entry(&interfaces, struct interface, head));
754 }
755