07dad1f0852adc38a528580db24803aadcf11ba1
[project/odhcpd.git] / src / config.c
1 #include <resolv.h>
2 #include <signal.h>
3 #include <arpa/inet.h>
4
5 #include <uci.h>
6 #include <uci_blob.h>
7
8 #include "odhcpd.h"
9
10 static struct blob_buf b;
11 struct list_head leases = LIST_HEAD_INIT(leases);
12 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
13 struct config config = {false, NULL, NULL};
14
15 enum {
16         IFACE_ATTR_INTERFACE,
17         IFACE_ATTR_IFNAME,
18         IFACE_ATTR_NETWORKID,
19         IFACE_ATTR_DYNAMICDHCP,
20         IFACE_ATTR_IGNORE,
21         IFACE_ATTR_LEASETIME,
22         IFACE_ATTR_LIMIT,
23         IFACE_ATTR_START,
24         IFACE_ATTR_MASTER,
25         IFACE_ATTR_UPSTREAM,
26         IFACE_ATTR_RA,
27         IFACE_ATTR_DHCPV4,
28         IFACE_ATTR_DHCPV6,
29         IFACE_ATTR_NDP,
30         IFACE_ATTR_DNS,
31         IFACE_ATTR_DOMAIN,
32         IFACE_ATTR_ULA_COMPAT,
33         IFACE_ATTR_RA_DEFAULT,
34         IFACE_ATTR_RA_MANAGEMENT,
35         IFACE_ATTR_RA_OFFLINK,
36         IFACE_ATTR_RA_PREFERENCE,
37         IFACE_ATTR_NDPROXY_ROUTING,
38         IFACE_ATTR_NDPROXY_SLAVE,
39         IFACE_ATTR_NDPROXY_STATIC,
40         IFACE_ATTR_MAX
41 };
42
43 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
44         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
45         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
46         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
47         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
48         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
49         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
50         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
51         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
52         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
53         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
54         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
55         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
56         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
57         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
58         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
59         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
60         [IFACE_ATTR_ULA_COMPAT] = { .name = "ula_compat", .type = BLOBMSG_TYPE_BOOL },
61         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
62         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
63         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
64         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
65         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
66         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
67         [IFACE_ATTR_NDPROXY_STATIC] = { .name = "ndproxy_static", .type = BLOBMSG_TYPE_ARRAY },
68 };
69
70 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
71         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
72         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
73         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
74         [IFACE_ATTR_NDPROXY_STATIC] = { .type = BLOBMSG_TYPE_STRING },
75 };
76
77 const struct uci_blob_param_list interface_attr_list = {
78         .n_params = IFACE_ATTR_MAX,
79         .params = iface_attrs,
80         .info = iface_attr_info,
81 };
82
83
84 enum {
85         LEASE_ATTR_IP,
86         LEASE_ATTR_MAC,
87         LEASE_ATTR_DUID,
88         LEASE_ATTR_HOSTID,
89         LEASE_ATTR_HOSTNAME,
90         LEASE_ATTR_MAX
91 };
92
93
94 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
95         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
96         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
97         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
98         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
99         [LEASE_ATTR_HOSTNAME] = { .name = "hostname", .type = BLOBMSG_TYPE_STRING },
100 };
101
102
103 const struct uci_blob_param_list lease_attr_list = {
104         .n_params = LEASE_ATTR_MAX,
105         .params = lease_attrs,
106 };
107
108
109 enum {
110         ODHCPD_ATTR_LEGACY,
111         ODHCPD_ATTR_LEASEFILE,
112         ODHCPD_ATTR_LEASETRIGGER,
113         ODHCPD_ATTR_MAX
114 };
115
116
117 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
118         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
119         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
120         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
121 };
122
123
124 const struct uci_blob_param_list odhcpd_attr_list = {
125         .n_params = ODHCPD_ATTR_MAX,
126         .params = odhcpd_attrs,
127 };
128
129
130 static struct interface* get_interface(const char *name)
131 {
132         struct interface *c;
133         list_for_each_entry(c, &interfaces, head)
134                 if (!strcmp(c->name, name))
135                         return c;
136         return NULL;
137 }
138
139
140 static void clean_interface(struct interface *iface)
141 {
142         free(iface->dns);
143         free(iface->search);
144         free(iface->upstream);
145         free(iface->static_ndp);
146         free(iface->dhcpv4_dns);
147         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
148 }
149
150
151 static void close_interface(struct interface *iface)
152 {
153         if (iface->head.next)
154                 list_del(&iface->head);
155
156         setup_router_interface(iface, false);
157         setup_dhcpv6_interface(iface, false);
158         setup_ndp_interface(iface, false);
159         setup_dhcpv4_interface(iface, false);
160
161         clean_interface(iface);
162         free(iface);
163 }
164
165
166 static int parse_mode(const char *mode)
167 {
168         if (!strcmp(mode, "disabled")) {
169                 return RELAYD_DISABLED;
170         } else if (!strcmp(mode, "server")) {
171                 return RELAYD_SERVER;
172         } else if (!strcmp(mode, "relay")) {
173                 return RELAYD_RELAY;
174         } else if (!strcmp(mode, "hybrid")) {
175                 return RELAYD_HYBRID;
176         } else {
177                 return -1;
178         }
179 }
180
181
182 static void set_config(struct uci_section *s)
183 {
184         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
185
186         blob_buf_init(&b, 0);
187         uci_to_blob(&b, s, &lease_attr_list);
188         blobmsg_parse(lease_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
189
190         if ((c = tb[ODHCPD_ATTR_LEGACY]))
191                 config.legacy = blobmsg_get_bool(c);
192
193         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
194                 free(config.dhcp_statefile);
195                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
196         }
197
198         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
199                 free(config.dhcp_cb);
200                 config.dhcp_cb = strdup(blobmsg_get_string(c));
201         }
202 }
203
204
205 static int set_lease(struct uci_section *s)
206 {
207         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
208
209         blob_buf_init(&b, 0);
210         uci_to_blob(&b, s, &lease_attr_list);
211         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
212
213         size_t hostlen = 1;
214         if ((c = tb[LEASE_ATTR_HOSTNAME]))
215                 hostlen = blobmsg_data_len(c);
216
217         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
218
219         if (hostlen > 1)
220                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
221
222         if ((c = tb[LEASE_ATTR_IP]))
223                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
224                         goto err;
225
226         if ((c = tb[LEASE_ATTR_MAC]))
227                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
228                         goto err;
229
230         if ((c = tb[LEASE_ATTR_DUID])) {
231                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
232                 lease->duid = malloc(duidlen);
233                 ssize_t len = odhcpd_unhexlify(lease->duid,
234                                 duidlen, blobmsg_get_string(c));
235
236                 if (len < 0)
237                         goto err;
238
239                 lease->duid_len = len;
240         }
241
242         if ((c = tb[LEASE_ATTR_HOSTID]))
243                 if (odhcpd_unhexlify((uint8_t*)&lease->hostid, sizeof(lease->hostid),
244                                 blobmsg_get_string(c)) < 0)
245                         goto err;
246
247         list_add(&lease->head, &leases);
248         return 0;
249
250 err:
251         free(lease->duid);
252         free(lease);
253         return -1;
254 }
255
256
257 int config_parse_interface(struct blob_attr *b, const char *name, bool overwrite)
258 {
259         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
260         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blob_data(b), blob_len(b));
261
262         if (tb[IFACE_ATTR_INTERFACE])
263                 name = blobmsg_data(tb[IFACE_ATTR_INTERFACE]);
264
265         struct interface *iface = get_interface(name);
266         if (!iface) {
267                 iface = calloc(1, sizeof(*iface));
268                 strncpy(iface->name, name, sizeof(iface->name) - 1);
269                 list_add(&iface->head, &interfaces);
270         } else {
271                 clean_interface(iface);
272         }
273
274         const char *ifname = NULL;
275 #ifdef WITH_UBUS
276         if (overwrite)
277                 ifname = ubus_get_ifname(name);
278 #endif
279         if ((c = tb[IFACE_ATTR_IFNAME]))
280                 ifname = blobmsg_get_string(c);
281         else if ((c = tb[IFACE_ATTR_NETWORKID]))
282                 ifname = blobmsg_get_string(c);
283
284         strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
285         iface->inuse = true;
286
287         if (overwrite)
288                 clean_interface(iface);
289
290         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
291                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
292
293         if ((c = tb[IFACE_ATTR_IGNORE]))
294                 iface->ignore = blobmsg_get_bool(c);
295
296         if ((c = tb[IFACE_ATTR_LEASETIME])) {
297                 char *val = blobmsg_get_string(c), *endptr;
298                 double time = strtod(val, &endptr);
299                 if (time && endptr[0]) {
300                         if (endptr[0] == 's')
301                                 time *= 1;
302                         else if (endptr[0] == 'm')
303                                 time *= 60;
304                         else if (endptr[0] == 'h')
305                                 time *= 3600;
306                         else if (endptr[0] == 'd')
307                                 time *= 24 * 3600;
308                         else if (endptr[0] == 'w')
309                                 time *= 7 * 24 * 3600;
310                         else
311                                 goto err;
312                 }
313
314                 if (time >= 60)
315                         iface->dhcpv4_leasetime = time;
316         }
317
318         if ((c = tb[IFACE_ATTR_START])) {
319                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
320
321                 if (config.legacy)
322                         iface->dhcpv4 = RELAYD_SERVER;
323         }
324
325         if ((c = tb[IFACE_ATTR_LIMIT]))
326                 iface->dhcpv4_end.s_addr = htonl(
327                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
328
329         if ((c = tb[IFACE_ATTR_MASTER]))
330                 iface->master = blobmsg_get_bool(c);
331
332         if ((c = tb[IFACE_ATTR_UPSTREAM])) {
333                 struct blob_attr *cur;
334                 unsigned rem;
335
336                 blobmsg_for_each_attr(cur, c, rem) {
337                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
338                                 continue;
339
340                         iface->upstream = realloc(iface->upstream,
341                                         iface->upstream_len + blobmsg_data_len(cur));
342                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
343                         iface->upstream_len += blobmsg_data_len(cur);
344                 }
345         }
346
347         if ((c = tb[IFACE_ATTR_RA]))
348                 if ((iface->ra = parse_mode(blobmsg_get_string(c))) < 0)
349                         goto err;
350
351         if ((c = tb[IFACE_ATTR_DHCPV4]))
352                 if ((iface->dhcpv4 = parse_mode(blobmsg_get_string(c))) < 0)
353                         goto err;
354
355         if ((c = tb[IFACE_ATTR_DHCPV6]))
356                 if ((iface->dhcpv6 = parse_mode(blobmsg_get_string(c))) < 0)
357                         goto err;
358
359         if ((c = tb[IFACE_ATTR_NDP]))
360                 if ((iface->ndp = parse_mode(blobmsg_get_string(c))) < 0)
361                         goto err;
362
363         if ((c = tb[IFACE_ATTR_DNS])) {
364                 struct blob_attr *cur;
365                 unsigned rem;
366
367                 iface->always_rewrite_dns = true;
368                 blobmsg_for_each_attr(cur, c, rem) {
369                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
370                                 continue;
371
372                         struct in_addr addr4;
373                         struct in6_addr addr6;
374                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
375                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
376                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
377                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
378                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
379                                 iface->dns = realloc(iface->dns,
380                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
381                                 iface->dns[iface->dns_cnt - 1] = addr6;
382                         } else {
383                                 goto err;
384                         }
385                 }
386         }
387
388         if ((c = tb[IFACE_ATTR_DOMAIN])) {
389                 struct blob_attr *cur;
390                 unsigned rem;
391
392                 blobmsg_for_each_attr(cur, c, rem) {
393                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
394                                 continue;
395
396                         uint8_t buf[256];
397                         int len = dn_comp(blobmsg_get_string(cur), buf, sizeof(buf), NULL, NULL);
398                         if (len <= 0)
399                                 goto err;
400
401                         iface->search = realloc(iface->search, iface->search_len + len);
402                         memcpy(&iface->search[iface->search_len], buf, len);
403                         iface->search_len += len;
404                 }
405         }
406
407         if ((c = tb[IFACE_ATTR_ULA_COMPAT]))
408                 iface->deprecate_ula_if_public_avail = blobmsg_get_bool(c);
409
410         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
411                 iface->default_router = blobmsg_get_u32(c);
412
413         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
414                 iface->managed = blobmsg_get_u32(c);
415
416         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
417                 iface->ra_not_onlink = blobmsg_get_bool(c);
418
419         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
420                 const char *prio = blobmsg_get_string(c);
421
422                 if (!strcmp(prio, "high"))
423                         iface->route_preference = 1;
424                 else if (!strcmp(prio, "low"))
425                         iface->route_preference = -1;
426                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
427                         iface->route_preference = 0;
428                 else
429                         goto err;
430         }
431
432         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
433                 iface->learn_routes = blobmsg_get_bool(c);
434
435         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
436                 iface->external = blobmsg_get_bool(c);
437
438         if ((c = tb[IFACE_ATTR_NDPROXY_STATIC])) {
439                 struct blob_attr *cur;
440                 unsigned rem;
441
442                 blobmsg_for_each_attr(cur, c, rem) {
443                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
444                                 continue;
445
446                         int len = blobmsg_data_len(cur);
447                         iface->static_ndp = realloc(iface->static_ndp, iface->static_ndp_len + len);
448                         memcpy(&iface->static_ndp[iface->static_ndp_len], blobmsg_get_string(cur), len);
449                         iface->static_ndp_len += len;
450                 }
451         }
452
453         iface->ignore = (iface->ifindex = if_nametoindex(iface->ifname)) < 0;
454         return 0;
455
456 err:
457         close_interface(iface);
458         return -1;
459 }
460
461 static int set_interface(struct uci_section *s)
462 {
463         blob_buf_init(&b, 0);
464         uci_to_blob(&b, s, &interface_attr_list);
465         return config_parse_interface(b.head, s->e.name, true);
466 }
467
468
469 static volatile int do_reload = false;
470 static void set_stop(int signal)
471 {
472         uloop_end();
473         do_reload = (signal == SIGHUP);
474 }
475
476 void odhcpd_run(void)
477 {
478         struct uci_context *uci = uci_alloc_context();
479         signal(SIGTERM, set_stop);
480         signal(SIGHUP, set_stop);
481         signal(SIGINT, set_stop);
482
483         do {
484                 do_reload = uloop_cancelled = false;
485
486                 struct lease *l;
487                 list_for_each_entry(l, &leases, head) {
488                         list_del(&l->head);
489                         free(l->duid);
490                         free(l);
491                 }
492
493                 struct uci_package *dhcp = NULL;
494                 if (!uci_load(uci, "dhcp", &dhcp)) {
495                         struct uci_element *e;
496                         uci_foreach_element(&dhcp->sections, e) {
497                                 struct uci_section *s = uci_to_section(e);
498                                 if (!strcmp(s->type, "lease"))
499                                         set_lease(s);
500                                 else if (!strcmp(s->type, "odhcpd"))
501                                         set_config(s);
502                         }
503
504                         uci_foreach_element(&dhcp->sections, e) {
505                                 struct uci_section *s = uci_to_section(e);
506                                 if (!strcmp(s->type, "dhcp"))
507                                         set_interface(s);
508                         }
509                 }
510
511 #ifdef WITH_UBUS
512                 ubus_apply_network();
513 #endif
514
515                 // Evaluate hybrid mode for master
516                 struct interface *master = NULL, *i;
517                 list_for_each_entry(i, &interfaces, head) {
518                         if (!i->master)
519                                 continue;
520
521                         enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
522 #ifdef WITH_UBUS
523                         if (ubus_has_prefix(i->name, i->ifname))
524                                 hybrid_mode = RELAYD_RELAY;
525 #endif
526
527                         if (i->dhcpv6 == RELAYD_HYBRID)
528                                 i->dhcpv6 = hybrid_mode;
529
530                         if (i->ra == RELAYD_HYBRID)
531                                 i->ra = hybrid_mode;
532
533                         if (i->ndp == RELAYD_HYBRID)
534                                 i->ndp = hybrid_mode;
535
536                         if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
537                                 master = i;
538                 }
539
540
541                 list_for_each_entry(i, &interfaces, head) {
542                         if (i->inuse && !i->ignore) {
543                                 // Resolve hybrid mode
544                                 if (i->dhcpv6 == RELAYD_HYBRID)
545                                         i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
546                                                         RELAYD_RELAY : RELAYD_SERVER;
547
548                                 if (i->ra == RELAYD_HYBRID)
549                                         i->ra = (master && master->ra == RELAYD_RELAY) ?
550                                                         RELAYD_RELAY : RELAYD_SERVER;
551
552                                 if (i->ndp == RELAYD_HYBRID)
553                                         i->ndp = (master && master->ndp == RELAYD_RELAY) ?
554                                                         RELAYD_RELAY : RELAYD_SERVER;
555
556                                 setup_router_interface(i, true);
557                                 setup_dhcpv6_interface(i, true);
558                                 setup_ndp_interface(i, true);
559                                 setup_dhcpv4_interface(i, true);
560                         } else {
561                                 close_interface(i);
562                         }
563                 }
564
565                 uloop_run();
566
567                 if (dhcp)
568                         uci_unload(uci, dhcp);
569         } while (do_reload);
570 }
571