router: add syslog debug tracing for trouble shooting
[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 <string.h>
8 #include <sys/stat.h>
9
10 #include <uci.h>
11 #include <uci_blob.h>
12
13 #include "odhcpd.h"
14
15 static struct blob_buf b;
16 static int reload_pipe[2];
17 struct list_head leases = LIST_HEAD_INIT(leases);
18 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
19 struct config config = {false, NULL, NULL};
20
21 enum {
22         IFACE_ATTR_INTERFACE,
23         IFACE_ATTR_IFNAME,
24         IFACE_ATTR_NETWORKID,
25         IFACE_ATTR_DYNAMICDHCP,
26         IFACE_ATTR_IGNORE,
27         IFACE_ATTR_LEASETIME,
28         IFACE_ATTR_LIMIT,
29         IFACE_ATTR_START,
30         IFACE_ATTR_MASTER,
31         IFACE_ATTR_UPSTREAM,
32         IFACE_ATTR_RA,
33         IFACE_ATTR_DHCPV4,
34         IFACE_ATTR_DHCPV6,
35         IFACE_ATTR_NDP,
36         IFACE_ATTR_ROUTER,
37         IFACE_ATTR_DNS,
38         IFACE_ATTR_DOMAIN,
39         IFACE_ATTR_FILTER_CLASS,
40         IFACE_ATTR_DHCPV6_RAW,
41         IFACE_ATTR_RA_DEFAULT,
42         IFACE_ATTR_RA_MANAGEMENT,
43         IFACE_ATTR_RA_OFFLINK,
44         IFACE_ATTR_RA_PREFERENCE,
45         IFACE_ATTR_RA_ADVROUTER,
46         IFACE_ATTR_RA_MAXINTERVAL,
47         IFACE_ATTR_PD_MANAGER,
48         IFACE_ATTR_PD_CER,
49         IFACE_ATTR_NDPROXY_ROUTING,
50         IFACE_ATTR_NDPROXY_SLAVE,
51         IFACE_ATTR_MAX
52 };
53
54 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
55         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
56         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
57         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
58         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
59         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
60         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
61         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
62         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
63         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
64         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
65         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
66         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
67         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
68         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
69         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
70         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
71         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
72         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
73         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
74         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
75         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
76         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
77         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
78         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
79         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
80         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
81         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
82         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
83         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
84 };
85
86 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
87         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
88         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
89         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
90 };
91
92 const struct uci_blob_param_list interface_attr_list = {
93         .n_params = IFACE_ATTR_MAX,
94         .params = iface_attrs,
95         .info = iface_attr_info,
96 };
97
98 enum {
99         LEASE_ATTR_IP,
100         LEASE_ATTR_MAC,
101         LEASE_ATTR_DUID,
102         LEASE_ATTR_HOSTID,
103         LEASE_ATTR_LEASETIME,
104         LEASE_ATTR_NAME,
105         LEASE_ATTR_MAX
106 };
107
108 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
109         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
110         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
111         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
112         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
113         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
114         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
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 enum {
123         ODHCPD_ATTR_MAINDHCP,
124         ODHCPD_ATTR_LEASEFILE,
125         ODHCPD_ATTR_LEASETRIGGER,
126         ODHCPD_ATTR_MAX
127 };
128
129 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
130         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
131         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
132         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
133 };
134
135 const struct uci_blob_param_list odhcpd_attr_list = {
136         .n_params = ODHCPD_ATTR_MAX,
137         .params = odhcpd_attrs,
138 };
139
140 static int mkdir_p(char *dir, mode_t mask)
141 {
142         char *l = strrchr(dir, '/');
143         int ret;
144
145         if (!l)
146                 return 0;
147
148         *l = '\0';
149
150         if (mkdir_p(dir, mask))
151                 return -1;
152
153         *l = '/';
154
155         ret = mkdir(dir, mask);
156         if (ret && errno == EEXIST)
157                 return 0;
158
159         if (ret)
160                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
161
162         return ret;
163 }
164
165 static void free_lease(struct lease *l)
166 {
167         if (l->head.next)
168                 list_del(&l->head);
169
170         free(l->duid);
171         free(l);
172 }
173
174 static struct interface* get_interface(const char *name)
175 {
176         struct interface *c;
177         list_for_each_entry(c, &interfaces, head)
178                 if (!strcmp(c->name, name))
179                         return c;
180         return NULL;
181 }
182
183 static void clean_interface(struct interface *iface)
184 {
185         free(iface->dns);
186         free(iface->search);
187         free(iface->upstream);
188         free(iface->dhcpv4_router);
189         free(iface->dhcpv4_dns);
190         free(iface->dhcpv6_raw);
191         free(iface->filter_class);
192         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
193 }
194
195 static void close_interface(struct interface *iface)
196 {
197         if (iface->head.next)
198                 list_del(&iface->head);
199
200         setup_router_interface(iface, false);
201         setup_dhcpv6_interface(iface, false);
202         setup_ndp_interface(iface, false);
203         setup_dhcpv4_interface(iface, false);
204
205         clean_interface(iface);
206         free(iface);
207 }
208
209 static int parse_mode(const char *mode)
210 {
211         if (!strcmp(mode, "disabled"))
212                 return RELAYD_DISABLED;
213         else if (!strcmp(mode, "server"))
214                 return RELAYD_SERVER;
215         else if (!strcmp(mode, "relay"))
216                 return RELAYD_RELAY;
217         else if (!strcmp(mode, "hybrid"))
218                 return RELAYD_HYBRID;
219         else
220                 return -1;
221 }
222
223 static void set_config(struct uci_section *s)
224 {
225         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
226
227         blob_buf_init(&b, 0);
228         uci_to_blob(&b, s, &odhcpd_attr_list);
229         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
230
231         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
232                 config.legacy = blobmsg_get_bool(c);
233
234         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
235                 free(config.dhcp_statefile);
236                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
237         }
238
239         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
240                 free(config.dhcp_cb);
241                 config.dhcp_cb = strdup(blobmsg_get_string(c));
242         }
243 }
244
245 static double parse_leasetime(struct blob_attr *c) {
246         char *val = blobmsg_get_string(c), *endptr = NULL;
247         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
248
249         if (time && endptr && endptr[0]) {
250                 if (endptr[0] == 's')
251                         time *= 1;
252                 else if (endptr[0] == 'm')
253                         time *= 60;
254                 else if (endptr[0] == 'h')
255                         time *= 3600;
256                 else if (endptr[0] == 'd')
257                         time *= 24 * 3600;
258                 else if (endptr[0] == 'w')
259                         time *= 7 * 24 * 3600;
260                 else
261                         goto err;
262         }
263
264         if (time >= 60)
265                 return time;
266
267         return 0;
268
269 err:
270         return -1;
271 }
272
273 static int set_lease(struct uci_section *s)
274 {
275         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
276
277         blob_buf_init(&b, 0);
278         uci_to_blob(&b, s, &lease_attr_list);
279         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
280
281         size_t hostlen = 1;
282         if ((c = tb[LEASE_ATTR_NAME]))
283                 hostlen = blobmsg_data_len(c);
284
285         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
286         if (!lease)
287                 goto err;
288
289         if (hostlen > 1)
290                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
291
292         if ((c = tb[LEASE_ATTR_IP]))
293                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
294                         goto err;
295
296         if ((c = tb[LEASE_ATTR_MAC]))
297                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
298                         goto err;
299
300         if ((c = tb[LEASE_ATTR_DUID])) {
301                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
302                 lease->duid = malloc(duidlen);
303                 if (!lease->duid)
304                         goto err;
305
306                 ssize_t len = odhcpd_unhexlify(lease->duid,
307                                 duidlen, blobmsg_get_string(c));
308
309                 if (len < 0)
310                         goto err;
311
312                 lease->duid_len = len;
313         }
314
315         if ((c = tb[LEASE_ATTR_HOSTID])) {
316                 errno = 0;
317                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
318                 if (errno)
319                         goto err;
320         }
321
322         if ((c = tb[LEASE_ATTR_LEASETIME])) {
323                 double time = parse_leasetime(c);
324                 if (time < 0)
325                         goto err;
326
327                 if (time >= 60)
328                         lease->dhcpv4_leasetime = time;
329         }
330
331         list_add(&lease->head, &leases);
332         return 0;
333
334 err:
335         if (lease)
336                 free_lease(lease);
337
338         return -1;
339 }
340
341 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
342 {
343         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
344         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
345
346         if (tb[IFACE_ATTR_INTERFACE])
347                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
348
349         if (!name)
350                 return -1;
351
352         struct interface *iface = get_interface(name);
353         if (!iface) {
354                 iface = calloc(1, sizeof(*iface));
355                 if (!iface)
356                         return -1;
357
358                 strncpy(iface->name, name, sizeof(iface->name) - 1);
359
360                 /* Default settings */
361                 iface->managed = 1;
362                 iface->learn_routes = true;
363
364                 list_add(&iface->head, &interfaces);
365                 overwrite = true;
366         }
367
368         const char *ifname = NULL;
369         if (overwrite) {
370                 if ((c = tb[IFACE_ATTR_IFNAME]))
371                         ifname = blobmsg_get_string(c);
372                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
373                         ifname = blobmsg_get_string(c);
374         }
375
376 #ifdef WITH_UBUS
377         if (overwrite || !iface->ifname[0])
378                 ifname = ubus_get_ifname(name);
379 #endif
380
381         if (!iface->ifname[0] && !ifname)
382                 goto err;
383
384         if (ifname)
385                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
386
387         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
388                 goto err;
389
390         iface->inuse = true;
391
392         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
393                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
394
395         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
396                 iface->ignore = blobmsg_get_bool(c);
397
398         if ((c = tb[IFACE_ATTR_LEASETIME])) {
399                 double time = parse_leasetime(c);
400                 if (time < 0)
401                         goto err;
402
403                 if (time >= 60)
404                         iface->dhcpv4_leasetime = time;
405         }
406
407         if ((c = tb[IFACE_ATTR_START])) {
408                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
409
410                 if (config.legacy)
411                         iface->dhcpv4 = RELAYD_SERVER;
412         }
413
414         if ((c = tb[IFACE_ATTR_LIMIT]))
415                 iface->dhcpv4_end.s_addr = htonl(
416                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
417
418         if ((c = tb[IFACE_ATTR_MASTER]))
419                 iface->master = blobmsg_get_bool(c);
420
421         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
422                 struct blob_attr *cur;
423                 unsigned rem;
424
425                 blobmsg_for_each_attr(cur, c, rem) {
426                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
427                                 continue;
428
429                         iface->upstream = realloc(iface->upstream,
430                                         iface->upstream_len + blobmsg_data_len(cur));
431                         if (!iface->upstream)
432                                 goto err;
433
434                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
435                         iface->upstream_len += blobmsg_data_len(cur);
436                 }
437         }
438
439         int mode;
440         if ((c = tb[IFACE_ATTR_RA])) {
441                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
442                         iface->ra = mode;
443                 else
444                         goto err;
445         }
446
447         if ((c = tb[IFACE_ATTR_DHCPV4])) {
448                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
449                         iface->dhcpv4 = mode;
450                 else
451                         goto err;
452         }
453
454         if ((c = tb[IFACE_ATTR_DHCPV6])) {
455                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
456                         iface->dhcpv6 = mode;
457                 else
458                         goto err;
459         }
460
461         if ((c = tb[IFACE_ATTR_NDP])) {
462                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
463                         iface->ndp = mode;
464                 else
465                         goto err;
466         }
467
468         if ((c = tb[IFACE_ATTR_ROUTER])) {
469                 struct blob_attr *cur;
470                 unsigned rem;
471
472                 blobmsg_for_each_attr(cur, c, rem) {
473                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
474                                 continue;
475
476                         struct in_addr addr4;
477                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
478                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
479                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
480                                 if (!iface->dhcpv4_router)
481                                         goto err;
482
483                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
484                         } else
485                                 goto err;
486                 }
487         }
488
489         if ((c = tb[IFACE_ATTR_DNS])) {
490                 struct blob_attr *cur;
491                 unsigned rem;
492
493                 iface->always_rewrite_dns = true;
494                 blobmsg_for_each_attr(cur, c, rem) {
495                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
496                                 continue;
497
498                         struct in_addr addr4;
499                         struct in6_addr addr6;
500                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
501                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
502                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
503                                 if (!iface->dhcpv4_dns)
504                                         goto err;
505
506                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
507                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
508                                 iface->dns = realloc(iface->dns,
509                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
510                                 if (!iface->dns)
511                                         goto err;
512
513                                 iface->dns[iface->dns_cnt - 1] = addr6;
514                         } else
515                                 goto err;
516                 }
517         }
518
519         if ((c = tb[IFACE_ATTR_DOMAIN])) {
520                 struct blob_attr *cur;
521                 unsigned rem;
522
523                 blobmsg_for_each_attr(cur, c, rem) {
524                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
525                                 continue;
526
527                         uint8_t buf[256];
528                         char *domain = blobmsg_get_string(cur);
529                         size_t domainlen = strlen(domain);
530                         if (domainlen > 0 && domain[domainlen - 1] == '.')
531                                 domain[domainlen - 1] = 0;
532
533                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
534                         if (len <= 0)
535                                 goto err;
536
537                         iface->search = realloc(iface->search, iface->search_len + len);
538                         if (!iface->search)
539                                 goto err;
540
541                         memcpy(&iface->search[iface->search_len], buf, len);
542                         iface->search_len += len;
543                 }
544         }
545
546         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
547                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
548                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
549         }
550
551         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
552                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
553                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
554                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
555         }
556
557         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
558                 iface->default_router = blobmsg_get_u32(c);
559
560         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
561                 iface->managed = blobmsg_get_u32(c);
562
563         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
564                 iface->ra_not_onlink = blobmsg_get_bool(c);
565
566         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
567                 iface->ra_advrouter = blobmsg_get_bool(c);
568
569         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
570                 iface->ra_maxinterval = blobmsg_get_u32(c);
571
572         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
573                 const char *prio = blobmsg_get_string(c);
574
575                 if (!strcmp(prio, "high"))
576                         iface->route_preference = 1;
577                 else if (!strcmp(prio, "low"))
578                         iface->route_preference = -1;
579                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
580                         iface->route_preference = 0;
581                 else
582                         goto err;
583         }
584
585         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
586                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
587                                 sizeof(iface->dhcpv6_pd_manager) - 1);
588
589         if ((c = tb[IFACE_ATTR_PD_CER]) &&
590                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
591                 goto err;
592
593         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
594                 iface->learn_routes = blobmsg_get_bool(c);
595
596         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
597                 iface->external = blobmsg_get_bool(c);
598
599         return 0;
600
601 err:
602         close_interface(iface);
603         return -1;
604 }
605
606 static int set_interface(struct uci_section *s)
607 {
608         blob_buf_init(&b, 0);
609         uci_to_blob(&b, s, &interface_attr_list);
610
611         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
612 }
613
614 void odhcpd_reload(void)
615 {
616         struct uci_context *uci = uci_alloc_context();
617
618         while (!list_empty(&leases))
619                 free_lease(list_first_entry(&leases, struct lease, head));
620
621         struct interface *master = NULL, *i, *n;
622
623         if (!uci)
624                 return;
625
626         list_for_each_entry(i, &interfaces, head)
627                 clean_interface(i);
628
629         struct uci_package *dhcp = NULL;
630         if (!uci_load(uci, "dhcp", &dhcp)) {
631                 struct uci_element *e;
632                 uci_foreach_element(&dhcp->sections, e) {
633                         struct uci_section *s = uci_to_section(e);
634                         if (!strcmp(s->type, "host"))
635                                 set_lease(s);
636                         else if (!strcmp(s->type, "odhcpd"))
637                                 set_config(s);
638                 }
639
640                 uci_foreach_element(&dhcp->sections, e) {
641                         struct uci_section *s = uci_to_section(e);
642                         if (!strcmp(s->type, "dhcp"))
643                                 set_interface(s);
644                 }
645         }
646
647         if (config.dhcp_statefile) {
648                 char *path = strdup(config.dhcp_statefile);
649
650                 mkdir_p(dirname(path), 0755);
651                 free(path);
652         }
653
654 #ifdef WITH_UBUS
655         ubus_apply_network();
656 #endif
657
658         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
659
660         /* Test for */
661         list_for_each_entry(i, &interfaces, head) {
662                 if (i->master)
663                         continue;
664
665                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
666                         any_dhcpv6_slave = true;
667
668                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
669                         any_ra_slave = true;
670
671                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
672                         any_ndp_slave = true;
673         }
674
675         /* Evaluate hybrid mode for master */
676         list_for_each_entry(i, &interfaces, head) {
677                 if (!i->master)
678                         continue;
679
680                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
681 #ifdef WITH_UBUS
682                 if (!ubus_has_prefix(i->name, i->ifname))
683                         hybrid_mode = RELAYD_RELAY;
684 #endif
685
686                 if (i->dhcpv6 == RELAYD_HYBRID)
687                         i->dhcpv6 = hybrid_mode;
688
689                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
690                         i->dhcpv6 = RELAYD_DISABLED;
691
692                 if (i->ra == RELAYD_HYBRID)
693                         i->ra = hybrid_mode;
694
695                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
696                         i->ra = RELAYD_DISABLED;
697
698                 if (i->ndp == RELAYD_HYBRID)
699                         i->ndp = hybrid_mode;
700
701                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
702                         i->ndp = RELAYD_DISABLED;
703
704                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
705                         master = i;
706         }
707
708
709         list_for_each_entry_safe(i, n, &interfaces, head) {
710                 if (i->inuse) {
711                         /* Resolve hybrid mode */
712                         if (i->dhcpv6 == RELAYD_HYBRID)
713                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
714                                                 RELAYD_RELAY : RELAYD_SERVER;
715
716                         if (i->ra == RELAYD_HYBRID)
717                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
718                                                 RELAYD_RELAY : RELAYD_SERVER;
719
720                         if (i->ndp == RELAYD_HYBRID)
721                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
722                                                 RELAYD_RELAY : RELAYD_DISABLED;
723
724                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
725                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
726                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
727                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
728                 } else {
729                         close_interface(i);
730                 }
731         }
732
733         uci_unload(uci, dhcp);
734         uci_free_context(uci);
735 }
736
737 static void handle_signal(int signal)
738 {
739         char b[1] = {0};
740
741         if (signal == SIGHUP) {
742                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
743         } else
744                 uloop_end();
745 }
746
747 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
748 {
749         char b[512];
750         if (read(u->fd, b, sizeof(b)) < 0) {}
751
752         odhcpd_reload();
753 }
754
755 static struct uloop_fd reload_fd = { .cb = reload_cb };
756
757 void odhcpd_run(void)
758 {
759         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
760
761         reload_fd.fd = reload_pipe[0];
762         uloop_fd_add(&reload_fd, ULOOP_READ);
763
764         signal(SIGTERM, handle_signal);
765         signal(SIGINT, handle_signal);
766         signal(SIGHUP, handle_signal);
767
768 #ifdef WITH_UBUS
769         while (init_ubus())
770                 sleep(1);
771 #endif
772
773         odhcpd_reload();
774         uloop_run();
775
776         while (!list_empty(&interfaces))
777                 close_interface(list_first_entry(&interfaces, struct interface, head));
778 }
779