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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
1e7a0e21 | 2 | /*** |
810adae9 | 3 | Copyright © 2014 Intel Corporation. All rights reserved. |
1e7a0e21 LP |
4 | ***/ |
5 | ||
6 | #include <netinet/icmp6.h> | |
7 | ||
8 | #include "sd-ndisc.h" | |
9 | ||
10 | #include "alloc-util.h" | |
11 | #include "dns-domain.h" | |
12 | #include "hostname-util.h" | |
0a970718 | 13 | #include "memory-util.h" |
1e7a0e21 LP |
14 | #include "missing.h" |
15 | #include "ndisc-internal.h" | |
16 | #include "ndisc-router.h" | |
17 | #include "strv.h" | |
18 | ||
8301aa0b | 19 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_ndisc_router, sd_ndisc_router, mfree); |
1e7a0e21 LP |
20 | |
21 | sd_ndisc_router *ndisc_router_new(size_t raw_size) { | |
22 | sd_ndisc_router *rt; | |
23 | ||
24 | rt = malloc0(ALIGN(sizeof(sd_ndisc_router)) + raw_size); | |
25 | if (!rt) | |
26 | return NULL; | |
27 | ||
28 | rt->raw_size = raw_size; | |
29 | rt->n_ref = 1; | |
30 | ||
31 | return rt; | |
32 | } | |
33 | ||
34 | _public_ int sd_ndisc_router_from_raw(sd_ndisc_router **ret, const void *raw, size_t raw_size) { | |
35 | _cleanup_(sd_ndisc_router_unrefp) sd_ndisc_router *rt = NULL; | |
36 | int r; | |
37 | ||
38 | assert_return(ret, -EINVAL); | |
39 | assert_return(raw || raw_size <= 0, -EINVAL); | |
40 | ||
41 | rt = ndisc_router_new(raw_size); | |
42 | if (!rt) | |
43 | return -ENOMEM; | |
44 | ||
45 | memcpy(NDISC_ROUTER_RAW(rt), raw, raw_size); | |
46 | r = ndisc_router_parse(rt); | |
47 | if (r < 0) | |
48 | return r; | |
49 | ||
1cc6c93a | 50 | *ret = TAKE_PTR(rt); |
1e7a0e21 LP |
51 | |
52 | return r; | |
53 | } | |
54 | ||
55 | _public_ int sd_ndisc_router_get_address(sd_ndisc_router *rt, struct in6_addr *ret_addr) { | |
56 | assert_return(rt, -EINVAL); | |
57 | assert_return(ret_addr, -EINVAL); | |
58 | ||
fdedbe26 | 59 | if (IN6_IS_ADDR_UNSPECIFIED(&rt->address)) |
1e7a0e21 LP |
60 | return -ENODATA; |
61 | ||
62 | *ret_addr = rt->address; | |
63 | return 0; | |
64 | } | |
65 | ||
66 | _public_ int sd_ndisc_router_get_timestamp(sd_ndisc_router *rt, clockid_t clock, uint64_t *ret) { | |
67 | assert_return(rt, -EINVAL); | |
68 | assert_return(TRIPLE_TIMESTAMP_HAS_CLOCK(clock), -EOPNOTSUPP); | |
69 | assert_return(clock_supported(clock), -EOPNOTSUPP); | |
70 | assert_return(ret, -EINVAL); | |
71 | ||
72 | if (!triple_timestamp_is_set(&rt->timestamp)) | |
73 | return -ENODATA; | |
74 | ||
75 | *ret = triple_timestamp_by_clock(&rt->timestamp, clock); | |
76 | return 0; | |
77 | } | |
78 | ||
79 | _public_ int sd_ndisc_router_get_raw(sd_ndisc_router *rt, const void **ret, size_t *size) { | |
80 | assert_return(rt, -EINVAL); | |
81 | assert_return(ret, -EINVAL); | |
82 | assert_return(size, -EINVAL); | |
83 | ||
84 | *ret = NDISC_ROUTER_RAW(rt); | |
85 | *size = rt->raw_size; | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | int ndisc_router_parse(sd_ndisc_router *rt) { | |
91 | struct nd_router_advert *a; | |
92 | const uint8_t *p; | |
93 | bool has_mtu = false, has_flag_extension = false; | |
94 | size_t left; | |
95 | ||
96 | assert(rt); | |
97 | ||
98 | if (rt->raw_size < sizeof(struct nd_router_advert)) { | |
99 | log_ndisc("Too small to be a router advertisement, ignoring."); | |
100 | return -EBADMSG; | |
101 | } | |
102 | ||
103 | /* Router advertisement packets are neatly aligned to 64bit boundaries, hence we can access them directly */ | |
104 | a = NDISC_ROUTER_RAW(rt); | |
105 | ||
106 | if (a->nd_ra_type != ND_ROUTER_ADVERT) { | |
107 | log_ndisc("Received ND packet that is not a router advertisement, ignoring."); | |
108 | return -EBADMSG; | |
109 | } | |
110 | ||
111 | if (a->nd_ra_code != 0) { | |
112 | log_ndisc("Received ND packet with wrong RA code, ignoring."); | |
113 | return -EBADMSG; | |
114 | } | |
115 | ||
116 | rt->hop_limit = a->nd_ra_curhoplimit; | |
117 | rt->flags = a->nd_ra_flags_reserved; /* the first 8bit */ | |
118 | rt->lifetime = be16toh(a->nd_ra_router_lifetime); | |
119 | ||
120 | rt->preference = (rt->flags >> 3) & 3; | |
121 | if (!IN_SET(rt->preference, SD_NDISC_PREFERENCE_LOW, SD_NDISC_PREFERENCE_HIGH)) | |
122 | rt->preference = SD_NDISC_PREFERENCE_MEDIUM; | |
123 | ||
124 | p = (const uint8_t*) NDISC_ROUTER_RAW(rt) + sizeof(struct nd_router_advert); | |
125 | left = rt->raw_size - sizeof(struct nd_router_advert); | |
126 | ||
127 | for (;;) { | |
128 | uint8_t type; | |
129 | size_t length; | |
130 | ||
131 | if (left == 0) | |
132 | break; | |
133 | ||
134 | if (left < 2) { | |
135 | log_ndisc("Option lacks header, ignoring datagram."); | |
136 | return -EBADMSG; | |
137 | } | |
138 | ||
139 | type = p[0]; | |
140 | length = p[1] * 8; | |
141 | ||
142 | if (length == 0) { | |
143 | log_ndisc("Zero-length option, ignoring datagram."); | |
144 | return -EBADMSG; | |
145 | } | |
146 | if (left < length) { | |
147 | log_ndisc("Option truncated, ignoring datagram."); | |
148 | return -EBADMSG; | |
149 | } | |
150 | ||
151 | switch (type) { | |
152 | ||
153 | case SD_NDISC_OPTION_PREFIX_INFORMATION: | |
154 | ||
155 | if (length != 4*8) { | |
156 | log_ndisc("Prefix option of invalid size, ignoring datagram."); | |
157 | return -EBADMSG; | |
158 | } | |
159 | ||
160 | if (p[2] > 128) { | |
161 | log_ndisc("Bad prefix length, ignoring datagram."); | |
162 | return -EBADMSG; | |
163 | } | |
164 | ||
165 | break; | |
166 | ||
167 | case SD_NDISC_OPTION_MTU: { | |
168 | uint32_t m; | |
169 | ||
170 | if (has_mtu) { | |
171 | log_ndisc("MTU option specified twice, ignoring."); | |
f3241c61 | 172 | break; |
1e7a0e21 LP |
173 | } |
174 | ||
175 | if (length != 8) { | |
176 | log_ndisc("MTU option of invalid size, ignoring datagram."); | |
177 | return -EBADMSG; | |
178 | } | |
179 | ||
180 | m = be32toh(*(uint32_t*) (p + 4)); | |
181 | if (m >= IPV6_MIN_MTU) /* ignore invalidly small MTUs */ | |
182 | rt->mtu = m; | |
183 | ||
184 | has_mtu = true; | |
185 | break; | |
186 | } | |
187 | ||
188 | case SD_NDISC_OPTION_ROUTE_INFORMATION: | |
189 | if (length < 1*8 || length > 3*8) { | |
190 | log_ndisc("Route information option of invalid size, ignoring datagram."); | |
191 | return -EBADMSG; | |
192 | } | |
193 | ||
194 | if (p[2] > 128) { | |
195 | log_ndisc("Bad route prefix length, ignoring datagram."); | |
196 | return -EBADMSG; | |
197 | } | |
198 | ||
199 | break; | |
200 | ||
201 | case SD_NDISC_OPTION_RDNSS: | |
202 | if (length < 3*8 || (length % (2*8)) != 1*8) { | |
203 | log_ndisc("RDNSS option has invalid size."); | |
204 | return -EBADMSG; | |
205 | } | |
206 | ||
207 | break; | |
208 | ||
209 | case SD_NDISC_OPTION_FLAGS_EXTENSION: | |
210 | ||
211 | if (has_flag_extension) { | |
212 | log_ndisc("Flags extension option specified twice, ignoring."); | |
f3241c61 | 213 | break; |
1e7a0e21 LP |
214 | } |
215 | ||
216 | if (length < 1*8) { | |
217 | log_ndisc("Flags extension option has invalid size."); | |
218 | return -EBADMSG; | |
219 | } | |
220 | ||
221 | /* Add in the additional flags bits */ | |
222 | rt->flags |= | |
223 | ((uint64_t) p[2] << 8) | | |
224 | ((uint64_t) p[3] << 16) | | |
225 | ((uint64_t) p[4] << 24) | | |
226 | ((uint64_t) p[5] << 32) | | |
227 | ((uint64_t) p[6] << 40) | | |
228 | ((uint64_t) p[7] << 48); | |
229 | ||
230 | has_flag_extension = true; | |
231 | break; | |
232 | ||
233 | case SD_NDISC_OPTION_DNSSL: | |
234 | if (length < 2*8) { | |
235 | log_ndisc("DNSSL option has invalid size."); | |
236 | return -EBADMSG; | |
237 | } | |
238 | ||
239 | break; | |
240 | } | |
241 | ||
242 | p += length, left -= length; | |
243 | } | |
244 | ||
245 | rt->rindex = sizeof(struct nd_router_advert); | |
246 | return 0; | |
247 | } | |
248 | ||
249 | _public_ int sd_ndisc_router_get_hop_limit(sd_ndisc_router *rt, uint8_t *ret) { | |
250 | assert_return(rt, -EINVAL); | |
251 | assert_return(ret, -EINVAL); | |
252 | ||
253 | *ret = rt->hop_limit; | |
254 | return 0; | |
255 | } | |
256 | ||
257 | _public_ int sd_ndisc_router_get_flags(sd_ndisc_router *rt, uint64_t *ret_flags) { | |
258 | assert_return(rt, -EINVAL); | |
259 | assert_return(ret_flags, -EINVAL); | |
260 | ||
261 | *ret_flags = rt->flags; | |
262 | return 0; | |
263 | } | |
264 | ||
265 | _public_ int sd_ndisc_router_get_lifetime(sd_ndisc_router *rt, uint16_t *ret_lifetime) { | |
266 | assert_return(rt, -EINVAL); | |
267 | assert_return(ret_lifetime, -EINVAL); | |
268 | ||
269 | *ret_lifetime = rt->lifetime; | |
270 | return 0; | |
271 | } | |
272 | ||
273 | _public_ int sd_ndisc_router_get_preference(sd_ndisc_router *rt, unsigned *ret) { | |
274 | assert_return(rt, -EINVAL); | |
275 | assert_return(ret, -EINVAL); | |
276 | ||
277 | *ret = rt->preference; | |
278 | return 0; | |
279 | } | |
280 | ||
281 | _public_ int sd_ndisc_router_get_mtu(sd_ndisc_router *rt, uint32_t *ret) { | |
282 | assert_return(rt, -EINVAL); | |
283 | assert_return(ret, -EINVAL); | |
284 | ||
285 | if (rt->mtu <= 0) | |
286 | return -ENODATA; | |
287 | ||
288 | *ret = rt->mtu; | |
289 | return 0; | |
290 | } | |
291 | ||
292 | _public_ int sd_ndisc_router_option_rewind(sd_ndisc_router *rt) { | |
293 | assert_return(rt, -EINVAL); | |
294 | ||
295 | assert(rt->raw_size >= sizeof(struct nd_router_advert)); | |
296 | rt->rindex = sizeof(struct nd_router_advert); | |
297 | ||
298 | return rt->rindex < rt->raw_size; | |
299 | } | |
300 | ||
301 | _public_ int sd_ndisc_router_option_next(sd_ndisc_router *rt) { | |
302 | size_t length; | |
303 | ||
304 | assert_return(rt, -EINVAL); | |
305 | ||
306 | if (rt->rindex == rt->raw_size) /* EOF */ | |
307 | return -ESPIPE; | |
308 | ||
309 | if (rt->rindex + 2 > rt->raw_size) /* Truncated message */ | |
310 | return -EBADMSG; | |
311 | ||
312 | length = NDISC_ROUTER_OPTION_LENGTH(rt); | |
313 | if (rt->rindex + length > rt->raw_size) | |
314 | return -EBADMSG; | |
315 | ||
316 | rt->rindex += length; | |
317 | return rt->rindex < rt->raw_size; | |
318 | } | |
319 | ||
320 | _public_ int sd_ndisc_router_option_get_type(sd_ndisc_router *rt, uint8_t *ret) { | |
321 | assert_return(rt, -EINVAL); | |
322 | assert_return(ret, -EINVAL); | |
323 | ||
324 | if (rt->rindex == rt->raw_size) /* EOF */ | |
325 | return -ESPIPE; | |
326 | ||
327 | if (rt->rindex + 2 > rt->raw_size) /* Truncated message */ | |
328 | return -EBADMSG; | |
329 | ||
330 | *ret = NDISC_ROUTER_OPTION_TYPE(rt); | |
331 | return 0; | |
332 | } | |
333 | ||
334 | _public_ int sd_ndisc_router_option_is_type(sd_ndisc_router *rt, uint8_t type) { | |
335 | uint8_t k; | |
336 | int r; | |
337 | ||
338 | assert_return(rt, -EINVAL); | |
339 | ||
340 | r = sd_ndisc_router_option_get_type(rt, &k); | |
341 | if (r < 0) | |
342 | return r; | |
343 | ||
344 | return type == k; | |
345 | } | |
346 | ||
347 | _public_ int sd_ndisc_router_option_get_raw(sd_ndisc_router *rt, const void **ret, size_t *size) { | |
348 | size_t length; | |
349 | ||
350 | assert_return(rt, -EINVAL); | |
351 | assert_return(ret, -EINVAL); | |
352 | assert_return(size, -EINVAL); | |
353 | ||
354 | /* Note that this returns the full option, including the option header */ | |
355 | ||
356 | if (rt->rindex + 2 > rt->raw_size) | |
357 | return -EBADMSG; | |
358 | ||
359 | length = NDISC_ROUTER_OPTION_LENGTH(rt); | |
360 | if (rt->rindex + length > rt->raw_size) | |
361 | return -EBADMSG; | |
362 | ||
363 | *ret = (uint8_t*) NDISC_ROUTER_RAW(rt) + rt->rindex; | |
364 | *size = length; | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | static int get_prefix_info(sd_ndisc_router *rt, struct nd_opt_prefix_info **ret) { | |
370 | struct nd_opt_prefix_info *ri; | |
371 | size_t length; | |
372 | int r; | |
373 | ||
374 | assert(rt); | |
375 | assert(ret); | |
376 | ||
377 | r = sd_ndisc_router_option_is_type(rt, SD_NDISC_OPTION_PREFIX_INFORMATION); | |
378 | if (r < 0) | |
379 | return r; | |
380 | if (r == 0) | |
381 | return -EMEDIUMTYPE; | |
382 | ||
383 | length = NDISC_ROUTER_OPTION_LENGTH(rt); | |
384 | if (length != sizeof(struct nd_opt_prefix_info)) | |
385 | return -EBADMSG; | |
386 | ||
387 | ri = (struct nd_opt_prefix_info*) ((uint8_t*) NDISC_ROUTER_RAW(rt) + rt->rindex); | |
388 | if (ri->nd_opt_pi_prefix_len > 128) | |
389 | return -EBADMSG; | |
390 | ||
391 | *ret = ri; | |
392 | return 0; | |
393 | } | |
394 | ||
395 | _public_ int sd_ndisc_router_prefix_get_valid_lifetime(sd_ndisc_router *rt, uint32_t *ret) { | |
396 | struct nd_opt_prefix_info *ri; | |
397 | int r; | |
398 | ||
399 | assert_return(rt, -EINVAL); | |
400 | assert_return(ret, -EINVAL); | |
401 | ||
402 | r = get_prefix_info(rt, &ri); | |
403 | if (r < 0) | |
404 | return r; | |
405 | ||
406 | *ret = be32toh(ri->nd_opt_pi_valid_time); | |
407 | return 0; | |
408 | } | |
409 | ||
410 | _public_ int sd_ndisc_router_prefix_get_preferred_lifetime(sd_ndisc_router *rt, uint32_t *ret) { | |
411 | struct nd_opt_prefix_info *pi; | |
412 | int r; | |
413 | ||
414 | assert_return(rt, -EINVAL); | |
415 | assert_return(ret, -EINVAL); | |
416 | ||
417 | r = get_prefix_info(rt, &pi); | |
418 | if (r < 0) | |
419 | return r; | |
420 | ||
421 | *ret = be32toh(pi->nd_opt_pi_preferred_time); | |
422 | return 0; | |
423 | } | |
424 | ||
425 | _public_ int sd_ndisc_router_prefix_get_flags(sd_ndisc_router *rt, uint8_t *ret) { | |
426 | struct nd_opt_prefix_info *pi; | |
9f702d00 | 427 | uint8_t flags; |
1e7a0e21 LP |
428 | int r; |
429 | ||
430 | assert_return(rt, -EINVAL); | |
431 | assert_return(ret, -EINVAL); | |
432 | ||
433 | r = get_prefix_info(rt, &pi); | |
434 | if (r < 0) | |
435 | return r; | |
436 | ||
9f702d00 JT |
437 | flags = pi->nd_opt_pi_flags_reserved; |
438 | ||
439 | if ((flags & ND_OPT_PI_FLAG_AUTO) && (pi->nd_opt_pi_prefix_len != 64)) { | |
440 | log_ndisc("Invalid prefix length, ignoring prefix for stateless autoconfiguration."); | |
441 | flags &= ~ND_OPT_PI_FLAG_AUTO; | |
442 | } | |
443 | ||
444 | *ret = flags; | |
1e7a0e21 LP |
445 | return 0; |
446 | } | |
447 | ||
448 | _public_ int sd_ndisc_router_prefix_get_address(sd_ndisc_router *rt, struct in6_addr *ret_addr) { | |
449 | struct nd_opt_prefix_info *pi; | |
450 | int r; | |
451 | ||
452 | assert_return(rt, -EINVAL); | |
453 | assert_return(ret_addr, -EINVAL); | |
454 | ||
455 | r = get_prefix_info(rt, &pi); | |
456 | if (r < 0) | |
457 | return r; | |
458 | ||
459 | *ret_addr = pi->nd_opt_pi_prefix; | |
460 | return 0; | |
461 | } | |
462 | ||
463 | _public_ int sd_ndisc_router_prefix_get_prefixlen(sd_ndisc_router *rt, unsigned *ret) { | |
464 | struct nd_opt_prefix_info *pi; | |
465 | int r; | |
466 | ||
467 | assert_return(rt, -EINVAL); | |
468 | assert_return(ret, -EINVAL); | |
469 | ||
470 | r = get_prefix_info(rt, &pi); | |
471 | if (r < 0) | |
472 | return r; | |
473 | ||
474 | if (pi->nd_opt_pi_prefix_len > 128) | |
475 | return -EBADMSG; | |
476 | ||
477 | *ret = pi->nd_opt_pi_prefix_len; | |
478 | return 0; | |
479 | } | |
480 | ||
481 | static int get_route_info(sd_ndisc_router *rt, uint8_t **ret) { | |
482 | uint8_t *ri; | |
483 | size_t length; | |
484 | int r; | |
485 | ||
486 | assert(rt); | |
487 | assert(ret); | |
488 | ||
489 | r = sd_ndisc_router_option_is_type(rt, SD_NDISC_OPTION_ROUTE_INFORMATION); | |
490 | if (r < 0) | |
491 | return r; | |
492 | if (r == 0) | |
493 | return -EMEDIUMTYPE; | |
494 | ||
495 | length = NDISC_ROUTER_OPTION_LENGTH(rt); | |
496 | if (length < 1*8 || length > 3*8) | |
497 | return -EBADMSG; | |
498 | ||
499 | ri = (uint8_t*) NDISC_ROUTER_RAW(rt) + rt->rindex; | |
500 | ||
501 | if (ri[2] > 128) | |
502 | return -EBADMSG; | |
503 | ||
504 | *ret = ri; | |
505 | return 0; | |
506 | } | |
507 | ||
508 | _public_ int sd_ndisc_router_route_get_lifetime(sd_ndisc_router *rt, uint32_t *ret) { | |
509 | uint8_t *ri; | |
510 | int r; | |
511 | ||
512 | assert_return(rt, -EINVAL); | |
513 | assert_return(ret, -EINVAL); | |
514 | ||
515 | r = get_route_info(rt, &ri); | |
516 | if (r < 0) | |
517 | return r; | |
518 | ||
519 | *ret = be32toh(*(uint32_t*) (ri + 4)); | |
520 | return 0; | |
521 | } | |
522 | ||
523 | _public_ int sd_ndisc_router_route_get_address(sd_ndisc_router *rt, struct in6_addr *ret_addr) { | |
524 | uint8_t *ri; | |
525 | int r; | |
526 | ||
527 | assert_return(rt, -EINVAL); | |
528 | assert_return(ret_addr, -EINVAL); | |
529 | ||
530 | r = get_route_info(rt, &ri); | |
531 | if (r < 0) | |
532 | return r; | |
533 | ||
534 | zero(*ret_addr); | |
535 | memcpy(ret_addr, ri + 8, NDISC_ROUTER_OPTION_LENGTH(rt) - 8); | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
540 | _public_ int sd_ndisc_router_route_get_prefixlen(sd_ndisc_router *rt, unsigned *ret) { | |
541 | uint8_t *ri; | |
542 | int r; | |
543 | ||
544 | assert_return(rt, -EINVAL); | |
545 | assert_return(ret, -EINVAL); | |
546 | ||
547 | r = get_route_info(rt, &ri); | |
548 | if (r < 0) | |
549 | return r; | |
550 | ||
551 | *ret = ri[2]; | |
552 | return 0; | |
553 | } | |
554 | ||
555 | _public_ int sd_ndisc_router_route_get_preference(sd_ndisc_router *rt, unsigned *ret) { | |
556 | uint8_t *ri; | |
557 | int r; | |
558 | ||
559 | assert_return(rt, -EINVAL); | |
560 | assert_return(ret, -EINVAL); | |
561 | ||
562 | r = get_route_info(rt, &ri); | |
563 | if (r < 0) | |
564 | return r; | |
565 | ||
566 | *ret = (ri[3] >> 3) & 3; | |
567 | if (!IN_SET(*ret, SD_NDISC_PREFERENCE_LOW, SD_NDISC_PREFERENCE_HIGH)) | |
568 | *ret = SD_NDISC_PREFERENCE_MEDIUM; | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
573 | static int get_rdnss_info(sd_ndisc_router *rt, uint8_t **ret) { | |
574 | size_t length; | |
575 | int r; | |
576 | ||
577 | assert(rt); | |
578 | assert(ret); | |
579 | ||
580 | r = sd_ndisc_router_option_is_type(rt, SD_NDISC_OPTION_RDNSS); | |
581 | if (r < 0) | |
582 | return r; | |
583 | if (r == 0) | |
584 | return -EMEDIUMTYPE; | |
585 | ||
586 | length = NDISC_ROUTER_OPTION_LENGTH(rt); | |
587 | if (length < 3*8 || (length % (2*8)) != 1*8) | |
588 | return -EBADMSG; | |
589 | ||
590 | *ret = (uint8_t*) NDISC_ROUTER_RAW(rt) + rt->rindex; | |
591 | return 0; | |
592 | } | |
593 | ||
594 | _public_ int sd_ndisc_router_rdnss_get_addresses(sd_ndisc_router *rt, const struct in6_addr **ret) { | |
595 | uint8_t *ri; | |
596 | int r; | |
597 | ||
598 | assert_return(rt, -EINVAL); | |
599 | assert_return(ret, -EINVAL); | |
600 | ||
601 | r = get_rdnss_info(rt, &ri); | |
602 | if (r < 0) | |
603 | return r; | |
604 | ||
605 | *ret = (const struct in6_addr*) (ri + 8); | |
606 | return (NDISC_ROUTER_OPTION_LENGTH(rt) - 8) / 16; | |
607 | } | |
608 | ||
609 | _public_ int sd_ndisc_router_rdnss_get_lifetime(sd_ndisc_router *rt, uint32_t *ret) { | |
610 | uint8_t *ri; | |
611 | int r; | |
612 | ||
613 | assert_return(rt, -EINVAL); | |
614 | assert_return(ret, -EINVAL); | |
615 | ||
616 | r = get_rdnss_info(rt, &ri); | |
617 | if (r < 0) | |
618 | return r; | |
619 | ||
620 | *ret = be32toh(*(uint32_t*) (ri + 4)); | |
621 | return 0; | |
622 | } | |
623 | ||
624 | static int get_dnssl_info(sd_ndisc_router *rt, uint8_t **ret) { | |
625 | size_t length; | |
626 | int r; | |
627 | ||
628 | assert(rt); | |
629 | assert(ret); | |
630 | ||
631 | r = sd_ndisc_router_option_is_type(rt, SD_NDISC_OPTION_DNSSL); | |
632 | if (r < 0) | |
633 | return r; | |
634 | if (r == 0) | |
635 | return -EMEDIUMTYPE; | |
636 | ||
637 | length = NDISC_ROUTER_OPTION_LENGTH(rt); | |
638 | if (length < 2*8) | |
639 | return -EBADMSG; | |
640 | ||
641 | *ret = (uint8_t*) NDISC_ROUTER_RAW(rt) + rt->rindex; | |
642 | return 0; | |
643 | } | |
644 | ||
645 | _public_ int sd_ndisc_router_dnssl_get_domains(sd_ndisc_router *rt, char ***ret) { | |
646 | _cleanup_strv_free_ char **l = NULL; | |
647 | _cleanup_free_ char *e = NULL; | |
648 | size_t allocated = 0, n = 0, left; | |
649 | uint8_t *ri, *p; | |
650 | bool first = true; | |
651 | int r; | |
652 | unsigned k = 0; | |
653 | ||
654 | assert_return(rt, -EINVAL); | |
655 | assert_return(ret, -EINVAL); | |
656 | ||
657 | r = get_dnssl_info(rt, &ri); | |
658 | if (r < 0) | |
659 | return r; | |
660 | ||
661 | p = ri + 8; | |
662 | left = NDISC_ROUTER_OPTION_LENGTH(rt) - 8; | |
663 | ||
664 | for (;;) { | |
665 | if (left == 0) { | |
666 | ||
667 | if (n > 0) /* Not properly NUL terminated */ | |
668 | return -EBADMSG; | |
669 | ||
670 | break; | |
671 | } | |
672 | ||
673 | if (*p == 0) { | |
674 | /* Found NUL termination */ | |
675 | ||
676 | if (n > 0) { | |
677 | _cleanup_free_ char *normalized = NULL; | |
678 | ||
679 | e[n] = 0; | |
7470cc4c | 680 | r = dns_name_normalize(e, 0, &normalized); |
1e7a0e21 LP |
681 | if (r < 0) |
682 | return r; | |
683 | ||
684 | /* Ignore the root domain name or "localhost" and friends */ | |
685 | if (!is_localhost(normalized) && | |
686 | !dns_name_is_root(normalized)) { | |
687 | ||
688 | if (strv_push(&l, normalized) < 0) | |
689 | return -ENOMEM; | |
690 | ||
691 | normalized = NULL; | |
692 | k++; | |
693 | } | |
694 | } | |
695 | ||
696 | n = 0; | |
697 | first = true; | |
698 | p++, left--; | |
699 | continue; | |
700 | } | |
701 | ||
702 | /* Check for compression (which is not allowed) */ | |
703 | if (*p > 63) | |
704 | return -EBADMSG; | |
705 | ||
706 | if (1U + *p + 1U > left) | |
707 | return -EBADMSG; | |
708 | ||
709 | if (!GREEDY_REALLOC(e, allocated, n + !first + DNS_LABEL_ESCAPED_MAX + 1U)) | |
710 | return -ENOMEM; | |
711 | ||
712 | if (first) | |
713 | first = false; | |
714 | else | |
715 | e[n++] = '.'; | |
716 | ||
717 | r = dns_label_escape((char*) p+1, *p, e + n, DNS_LABEL_ESCAPED_MAX); | |
718 | if (r < 0) | |
719 | return r; | |
720 | ||
721 | n += r; | |
722 | ||
723 | left -= 1 + *p; | |
724 | p += 1 + *p; | |
725 | } | |
726 | ||
727 | if (strv_isempty(l)) { | |
728 | *ret = NULL; | |
729 | return 0; | |
730 | } | |
731 | ||
1cc6c93a | 732 | *ret = TAKE_PTR(l); |
1e7a0e21 LP |
733 | |
734 | return k; | |
735 | } | |
736 | ||
737 | _public_ int sd_ndisc_router_dnssl_get_lifetime(sd_ndisc_router *rt, uint32_t *ret_sec) { | |
738 | uint8_t *ri; | |
739 | int r; | |
740 | ||
741 | assert_return(rt, -EINVAL); | |
742 | assert_return(ret_sec, -EINVAL); | |
743 | ||
744 | r = get_dnssl_info(rt, &ri); | |
745 | if (r < 0) | |
746 | return r; | |
747 | ||
748 | *ret_sec = be32toh(*(uint32_t*) (ri + 4)); | |
749 | return 0; | |
750 | } |