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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
4d1cf1e2 | 2 | |
4d1cf1e2 | 3 | #include <errno.h> |
07630cea LP |
4 | #include <netdb.h> |
5 | #include <nss.h> | |
55679e29 | 6 | #include <pthread.h> |
4d1cf1e2 | 7 | #include <stdlib.h> |
ca78ad1d ZJS |
8 | #include <sys/types.h> |
9 | #include <unistd.h> | |
4d1cf1e2 | 10 | |
aee9d18c | 11 | #include "env-util.h" |
2b2fec7d | 12 | #include "errno-util.h" |
28e5e1e9 | 13 | #include "glyph-util.h" |
07630cea | 14 | #include "in-addr-util.h" |
4d1cf1e2 LP |
15 | #include "macro.h" |
16 | #include "nss-util.h" | |
4cbfd62b | 17 | #include "resolved-def.h" |
0c5eb056 | 18 | #include "signal-util.h" |
2b2fec7d | 19 | #include "string-util.h" |
0c73f4f0 LP |
20 | #include "strv.h" |
21 | #include "varlink.h" | |
4d1cf1e2 | 22 | |
55679e29 ZJS |
23 | static JsonDispatchFlags json_dispatch_flags = 0; |
24 | ||
25 | static void setup_logging(void) { | |
a7d15a24 | 26 | log_parse_environment_variables(); |
55679e29 ZJS |
27 | |
28 | if (DEBUG_LOGGING) | |
29 | json_dispatch_flags = JSON_LOG; | |
30 | } | |
31 | ||
32 | static void setup_logging_once(void) { | |
33 | static pthread_once_t once = PTHREAD_ONCE_INIT; | |
34 | assert_se(pthread_once(&once, setup_logging) == 0); | |
35 | } | |
36 | ||
37 | #define NSS_ENTRYPOINT_BEGIN \ | |
38 | BLOCK_SIGNALS(NSS_SIGNALS_BLOCK); \ | |
39 | setup_logging_once() | |
40 | ||
4d1cf1e2 LP |
41 | NSS_GETHOSTBYNAME_PROTOTYPES(resolve); |
42 | NSS_GETHOSTBYADDR_PROTOTYPES(resolve); | |
43 | ||
0c73f4f0 | 44 | static bool error_shall_fallback(const char *error_id) { |
ae78529f LP |
45 | /* The Varlink errors where we shall signal "please fallback" back to the NSS stack, so that some |
46 | * fallback module can be loaded. (These are mostly all Varlink-internal errors, as apparently we | |
47 | * then were unable to even do IPC with systemd-resolved.) */ | |
0c73f4f0 LP |
48 | return STR_IN_SET(error_id, |
49 | VARLINK_ERROR_DISCONNECTED, | |
50 | VARLINK_ERROR_TIMEOUT, | |
51 | VARLINK_ERROR_PROTOCOL, | |
52 | VARLINK_ERROR_INTERFACE_NOT_FOUND, | |
53 | VARLINK_ERROR_METHOD_NOT_FOUND, | |
54 | VARLINK_ERROR_METHOD_NOT_IMPLEMENTED); | |
7c2a5e26 LP |
55 | } |
56 | ||
ae78529f LP |
57 | static bool error_shall_try_again(const char *error_id) { |
58 | /* The Varlink errors where we shall signal "can't answer now but might be able to later" back to the | |
59 | * NSS stack. These are all errors that indicate lack of configuration or network problems. */ | |
60 | return STR_IN_SET(error_id, | |
61 | "io.systemd.Resolve.NoNameServers", | |
62 | "io.systemd.Resolve.QueryTimedOut", | |
63 | "io.systemd.Resolve.MaxAttemptsReached", | |
64 | "io.systemd.Resolve.NetworkDown"); | |
65 | } | |
66 | ||
0c73f4f0 LP |
67 | static int connect_to_resolved(Varlink **ret) { |
68 | _cleanup_(varlink_unrefp) Varlink *link = NULL; | |
69 | int r; | |
309e9d86 | 70 | |
0c73f4f0 | 71 | r = varlink_connect_address(&link, "/run/systemd/resolve/io.systemd.Resolve"); |
4d1cf1e2 LP |
72 | if (r < 0) |
73 | return r; | |
74 | ||
0c73f4f0 | 75 | r = varlink_set_relative_timeout(link, SD_RESOLVED_QUERY_TIMEOUT_USEC); |
309e9d86 LP |
76 | if (r < 0) |
77 | return r; | |
78 | ||
0c73f4f0 LP |
79 | *ret = TAKE_PTR(link); |
80 | return 0; | |
4d1cf1e2 LP |
81 | } |
82 | ||
27007eff LP |
83 | static uint32_t ifindex_to_scopeid(int family, const void *a, int ifindex) { |
84 | struct in6_addr in6; | |
85 | ||
425ed139 | 86 | if (family != AF_INET6 || ifindex == 0) |
27007eff LP |
87 | return 0; |
88 | ||
89 | /* Some apps can't deal with the scope ID attached to non-link-local addresses. Hence, let's suppress that. */ | |
90 | ||
11814bbb | 91 | assert(sizeof(in6) == FAMILY_ADDRESS_SIZE(AF_INET6)); |
27007eff LP |
92 | memcpy(&in6, a, sizeof(struct in6_addr)); |
93 | ||
94876904 | 94 | return in6_addr_is_link_local(&in6) ? ifindex : 0; |
27007eff LP |
95 | } |
96 | ||
0c73f4f0 | 97 | static int json_dispatch_ifindex(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) { |
99534007 | 98 | int *ifi = ASSERT_PTR(userdata); |
718ca772 | 99 | int64_t t; |
2f28018c | 100 | |
0c73f4f0 | 101 | assert(variant); |
2f28018c | 102 | |
0c73f4f0 LP |
103 | if (!json_variant_is_integer(variant)) |
104 | return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not an integer.", strna(name)); | |
2f28018c | 105 | |
0c73f4f0 | 106 | t = json_variant_integer(variant); |
6da52ca8 | 107 | if (t > INT_MAX) |
0c73f4f0 LP |
108 | return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is out of bounds for an interface index.", strna(name)); |
109 | ||
110 | *ifi = (int) t; | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static int json_dispatch_family(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) { | |
99534007 | 115 | int *family = ASSERT_PTR(userdata); |
718ca772 | 116 | int64_t t; |
0c73f4f0 LP |
117 | |
118 | assert(variant); | |
0c73f4f0 LP |
119 | |
120 | if (!json_variant_is_integer(variant)) | |
121 | return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not an integer.", strna(name)); | |
122 | ||
123 | t = json_variant_integer(variant); | |
124 | if (t < 0 || t > INT_MAX) | |
125 | return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not a valid family.", strna(name)); | |
126 | ||
127 | *family = (int) t; | |
128 | return 0; | |
129 | } | |
130 | ||
131 | typedef struct ResolveHostnameReply { | |
132 | JsonVariant *addresses; | |
133 | char *name; | |
134 | uint64_t flags; | |
135 | } ResolveHostnameReply; | |
136 | ||
137 | static void resolve_hostname_reply_destroy(ResolveHostnameReply *p) { | |
138 | assert(p); | |
139 | ||
140 | json_variant_unref(p->addresses); | |
141 | free(p->name); | |
2f28018c LP |
142 | } |
143 | ||
0c73f4f0 LP |
144 | static const JsonDispatch resolve_hostname_reply_dispatch_table[] = { |
145 | { "addresses", JSON_VARIANT_ARRAY, json_dispatch_variant, offsetof(ResolveHostnameReply, addresses), JSON_MANDATORY }, | |
146 | { "name", JSON_VARIANT_STRING, json_dispatch_string, offsetof(ResolveHostnameReply, name), 0 }, | |
147 | { "flags", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(ResolveHostnameReply, flags), 0 }, | |
148 | {} | |
149 | }; | |
150 | ||
151 | typedef struct AddressParameters { | |
152 | int ifindex; | |
153 | int family; | |
154 | union in_addr_union address; | |
155 | size_t address_size; | |
156 | } AddressParameters; | |
157 | ||
158 | static int json_dispatch_address(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) { | |
99534007 | 159 | AddressParameters *p = ASSERT_PTR(userdata); |
0c73f4f0 LP |
160 | union in_addr_union buf = {}; |
161 | JsonVariant *i; | |
162 | size_t n, k = 0; | |
163 | ||
164 | assert(variant); | |
0c73f4f0 LP |
165 | |
166 | if (!json_variant_is_array(variant)) | |
167 | return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not an array.", strna(name)); | |
168 | ||
169 | n = json_variant_elements(variant); | |
170 | if (!IN_SET(n, 4, 16)) | |
171 | return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is array of unexpected size.", strna(name)); | |
172 | ||
173 | JSON_VARIANT_ARRAY_FOREACH(i, variant) { | |
718ca772 | 174 | int64_t b; |
0c73f4f0 LP |
175 | |
176 | if (!json_variant_is_integer(i)) | |
177 | return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "Element %zu of JSON field '%s' is not an integer.", k, strna(name)); | |
178 | ||
179 | b = json_variant_integer(i); | |
180 | if (b < 0 || b > 0xff) | |
28e5e1e9 DT |
181 | return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), |
182 | "Element %zu of JSON field '%s' is out of range 0%s255.", | |
183 | k, strna(name), special_glyph(SPECIAL_GLYPH_ELLIPSIS)); | |
0c73f4f0 LP |
184 | |
185 | buf.bytes[k++] = (uint8_t) b; | |
186 | } | |
187 | ||
188 | p->address = buf; | |
189 | p->address_size = k; | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | static const JsonDispatch address_parameters_dispatch_table[] = { | |
195 | { "ifindex", JSON_VARIANT_INTEGER, json_dispatch_ifindex, offsetof(AddressParameters, ifindex), 0 }, | |
196 | { "family", JSON_VARIANT_INTEGER, json_dispatch_family, offsetof(AddressParameters, family), JSON_MANDATORY }, | |
197 | { "address", JSON_VARIANT_ARRAY, json_dispatch_address, 0, JSON_MANDATORY }, | |
198 | {} | |
199 | }; | |
200 | ||
8ef114c6 ZJS |
201 | static uint64_t query_flag( |
202 | const char *name, | |
203 | const int value, | |
204 | uint64_t flag) { | |
aee9d18c LP |
205 | int r; |
206 | ||
8ef114c6 ZJS |
207 | r = getenv_bool_secure(name); |
208 | if (r >= 0) | |
209 | return r == value ? flag : 0; | |
210 | if (r != -ENXIO) | |
211 | log_debug_errno(r, "Failed to parse $%s, ignoring.", name); | |
212 | return 0; | |
213 | } | |
aee9d18c | 214 | |
8ef114c6 ZJS |
215 | static uint64_t query_flags(void) { |
216 | /* Allow callers to turn off validation, synthetization, caching, etc., when we resolve via | |
217 | * nss-resolve. */ | |
218 | return query_flag("SYSTEMD_NSS_RESOLVE_VALIDATE", 0, SD_RESOLVED_NO_VALIDATE) | | |
219 | query_flag("SYSTEMD_NSS_RESOLVE_SYNTHESIZE", 0, SD_RESOLVED_NO_SYNTHESIZE) | | |
220 | query_flag("SYSTEMD_NSS_RESOLVE_CACHE", 0, SD_RESOLVED_NO_CACHE) | | |
221 | query_flag("SYSTEMD_NSS_RESOLVE_ZONE", 0, SD_RESOLVED_NO_ZONE) | | |
222 | query_flag("SYSTEMD_NSS_RESOLVE_TRUST_ANCHOR", 0, SD_RESOLVED_NO_TRUST_ANCHOR) | | |
223 | query_flag("SYSTEMD_NSS_RESOLVE_NETWORK", 0, SD_RESOLVED_NO_NETWORK); | |
aee9d18c LP |
224 | } |
225 | ||
4d1cf1e2 LP |
226 | enum nss_status _nss_resolve_gethostbyname4_r( |
227 | const char *name, | |
228 | struct gaih_addrtuple **pat, | |
229 | char *buffer, size_t buflen, | |
230 | int *errnop, int *h_errnop, | |
231 | int32_t *ttlp) { | |
232 | ||
0c73f4f0 | 233 | _cleanup_(varlink_unrefp) Varlink *link = NULL; |
75d2f0a0 ZJS |
234 | _cleanup_(json_variant_unrefp) JsonVariant *cparams = NULL; |
235 | _cleanup_(resolve_hostname_reply_destroy) ResolveHostnameReply p = {}; | |
236 | JsonVariant *rparams, *entry; | |
0c73f4f0 | 237 | int r; |
4d1cf1e2 | 238 | |
06202b9e | 239 | PROTECT_ERRNO; |
55679e29 | 240 | NSS_ENTRYPOINT_BEGIN; |
0c5eb056 | 241 | |
4d1cf1e2 LP |
242 | assert(name); |
243 | assert(pat); | |
244 | assert(buffer); | |
245 | assert(errnop); | |
246 | assert(h_errnop); | |
247 | ||
0c73f4f0 | 248 | r = connect_to_resolved(&link); |
4d1cf1e2 LP |
249 | if (r < 0) |
250 | goto fail; | |
251 | ||
0c73f4f0 | 252 | r = json_build(&cparams, JSON_BUILD_OBJECT( |
aee9d18c LP |
253 | JSON_BUILD_PAIR("name", JSON_BUILD_STRING(name)), |
254 | JSON_BUILD_PAIR("flags", JSON_BUILD_UNSIGNED(query_flags())))); | |
4d1cf1e2 LP |
255 | if (r < 0) |
256 | goto fail; | |
257 | ||
3c229a9a YW |
258 | /* Return NSS_STATUS_UNAVAIL when communication with systemd-resolved fails, allowing falling |
259 | * back to other nss modules. Treat all other error conditions as NOTFOUND. This includes | |
260 | * DNSSEC errors and suchlike. (We don't use UNAVAIL in this case so that the nsswitch.conf | |
261 | * configuration can distinguish such executed but negative replies from complete failure to | |
262 | * talk to resolved). */ | |
75d2f0a0 | 263 | const char *error_id; |
0c73f4f0 | 264 | r = varlink_call(link, "io.systemd.Resolve.ResolveHostname", cparams, &rparams, &error_id, NULL); |
3c229a9a YW |
265 | if (r < 0) |
266 | goto fail; | |
267 | if (!isempty(error_id)) { | |
ae78529f LP |
268 | if (error_shall_try_again(error_id)) |
269 | goto try_again; | |
270 | if (error_shall_fallback(error_id)) | |
271 | goto fail; | |
cb4e5d51 MP |
272 | if (streq(error_id, "io.systemd.Resolve.NoSuchResourceRecord")) |
273 | goto no_data; | |
ae78529f | 274 | goto not_found; |
4d1cf1e2 LP |
275 | } |
276 | ||
f1b622a0 | 277 | r = json_dispatch(rparams, resolve_hostname_reply_dispatch_table, json_dispatch_flags, &p); |
0c73f4f0 | 278 | if (r < 0) |
4d1cf1e2 | 279 | goto fail; |
0c73f4f0 | 280 | if (json_variant_is_blank_object(p.addresses)) |
06202b9e | 281 | goto not_found; |
4d1cf1e2 | 282 | |
75d2f0a0 | 283 | size_t n_addresses = 0; |
0c73f4f0 LP |
284 | JSON_VARIANT_ARRAY_FOREACH(entry, p.addresses) { |
285 | AddressParameters q = {}; | |
286 | ||
f1b622a0 | 287 | r = json_dispatch(entry, address_parameters_dispatch_table, json_dispatch_flags, &q); |
0c73f4f0 LP |
288 | if (r < 0) |
289 | goto fail; | |
290 | ||
291 | if (!IN_SET(q.family, AF_INET, AF_INET6)) | |
292 | continue; | |
293 | ||
294 | if (q.address_size != FAMILY_ADDRESS_SIZE(q.family)) { | |
295 | r = -EINVAL; | |
296 | goto fail; | |
297 | } | |
298 | ||
75d2f0a0 | 299 | n_addresses++; |
0c73f4f0 LP |
300 | } |
301 | ||
75d2f0a0 ZJS |
302 | const char *canonical = p.name ?: name; |
303 | size_t l = strlen(canonical); | |
304 | size_t idx, ms = ALIGN(l+1) + ALIGN(sizeof(struct gaih_addrtuple)) * n_addresses; | |
309e9d86 | 305 | |
4d1cf1e2 | 306 | if (buflen < ms) { |
cdccd29f | 307 | UNPROTECT_ERRNO; |
0192cbdb | 308 | *errnop = ERANGE; |
e36c6e48 | 309 | *h_errnop = NETDB_INTERNAL; |
4d1cf1e2 LP |
310 | return NSS_STATUS_TRYAGAIN; |
311 | } | |
312 | ||
313 | /* First, append name */ | |
75d2f0a0 ZJS |
314 | char *r_name = buffer; |
315 | memcpy(r_name, canonical, l + 1); | |
316 | idx = ALIGN(l + 1); | |
4d1cf1e2 LP |
317 | |
318 | /* Second, append addresses */ | |
75d2f0a0 ZJS |
319 | struct gaih_addrtuple *r_tuple = NULL, |
320 | *r_tuple_first = (struct gaih_addrtuple*) (buffer + idx); | |
309e9d86 | 321 | |
0c73f4f0 LP |
322 | JSON_VARIANT_ARRAY_FOREACH(entry, p.addresses) { |
323 | AddressParameters q = {}; | |
78c6a153 | 324 | |
f1b622a0 | 325 | r = json_dispatch(entry, address_parameters_dispatch_table, json_dispatch_flags, &q); |
4d1cf1e2 LP |
326 | if (r < 0) |
327 | goto fail; | |
328 | ||
0c73f4f0 | 329 | if (!IN_SET(q.family, AF_INET, AF_INET6)) |
4d1cf1e2 LP |
330 | continue; |
331 | ||
4d1cf1e2 | 332 | r_tuple = (struct gaih_addrtuple*) (buffer + idx); |
0c73f4f0 | 333 | r_tuple->next = (struct gaih_addrtuple*) ((char*) r_tuple + ALIGN(sizeof(struct gaih_addrtuple))); |
4d1cf1e2 | 334 | r_tuple->name = r_name; |
0c73f4f0 LP |
335 | r_tuple->family = q.family; |
336 | r_tuple->scopeid = ifindex_to_scopeid(q.family, &q.address, q.ifindex); | |
337 | memcpy(r_tuple->addr, &q.address, q.address_size); | |
4d1cf1e2 LP |
338 | |
339 | idx += ALIGN(sizeof(struct gaih_addrtuple)); | |
4d1cf1e2 | 340 | } |
4d1cf1e2 | 341 | |
75d2f0a0 | 342 | assert(r_tuple); /* We had at least one address, so r_tuple must be set */ |
0c73f4f0 LP |
343 | r_tuple->next = NULL; /* Override last next pointer */ |
344 | ||
4d1cf1e2 LP |
345 | assert(idx == ms); |
346 | ||
347 | if (*pat) | |
348 | **pat = *r_tuple_first; | |
349 | else | |
350 | *pat = r_tuple_first; | |
351 | ||
352 | if (ttlp) | |
353 | *ttlp = 0; | |
354 | ||
06202b9e YW |
355 | /* Explicitly reset both *h_errnop and h_errno to work around |
356 | * https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */ | |
e70df46b LP |
357 | *h_errnop = NETDB_SUCCESS; |
358 | h_errno = 0; | |
359 | ||
4d1cf1e2 LP |
360 | return NSS_STATUS_SUCCESS; |
361 | ||
362 | fail: | |
cdccd29f | 363 | UNPROTECT_ERRNO; |
0192cbdb | 364 | *errnop = -r; |
a464cf80 | 365 | *h_errnop = NO_RECOVERY; |
954cba66 | 366 | return NSS_STATUS_UNAVAIL; |
06202b9e YW |
367 | |
368 | not_found: | |
369 | *h_errnop = HOST_NOT_FOUND; | |
370 | return NSS_STATUS_NOTFOUND; | |
ae78529f | 371 | |
cb4e5d51 MP |
372 | no_data: |
373 | *h_errnop = NO_DATA; | |
374 | return NSS_STATUS_NOTFOUND; | |
375 | ||
ae78529f LP |
376 | try_again: |
377 | UNPROTECT_ERRNO; | |
378 | *errnop = -r; | |
379 | *h_errnop = TRY_AGAIN; | |
380 | return NSS_STATUS_TRYAGAIN; | |
4d1cf1e2 LP |
381 | } |
382 | ||
383 | enum nss_status _nss_resolve_gethostbyname3_r( | |
384 | const char *name, | |
385 | int af, | |
386 | struct hostent *result, | |
387 | char *buffer, size_t buflen, | |
388 | int *errnop, int *h_errnop, | |
389 | int32_t *ttlp, | |
390 | char **canonp) { | |
391 | ||
0c73f4f0 | 392 | _cleanup_(varlink_unrefp) Varlink *link = NULL; |
75d2f0a0 ZJS |
393 | _cleanup_(json_variant_unrefp) JsonVariant *cparams = NULL; |
394 | _cleanup_(resolve_hostname_reply_destroy) ResolveHostnameReply p = {}; | |
395 | JsonVariant *rparams, *entry; | |
0c73f4f0 | 396 | int r; |
4d1cf1e2 | 397 | |
06202b9e | 398 | PROTECT_ERRNO; |
55679e29 | 399 | NSS_ENTRYPOINT_BEGIN; |
0c5eb056 | 400 | |
4d1cf1e2 LP |
401 | assert(name); |
402 | assert(result); | |
403 | assert(buffer); | |
404 | assert(errnop); | |
405 | assert(h_errnop); | |
406 | ||
407 | if (af == AF_UNSPEC) | |
408 | af = AF_INET; | |
409 | ||
4c701096 | 410 | if (!IN_SET(af, AF_INET, AF_INET6)) { |
4d1cf1e2 LP |
411 | r = -EAFNOSUPPORT; |
412 | goto fail; | |
413 | } | |
414 | ||
0c73f4f0 | 415 | r = connect_to_resolved(&link); |
4d1cf1e2 LP |
416 | if (r < 0) |
417 | goto fail; | |
418 | ||
0c73f4f0 | 419 | r = json_build(&cparams, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("name", JSON_BUILD_STRING(name)), |
aee9d18c LP |
420 | JSON_BUILD_PAIR("family", JSON_BUILD_INTEGER(af)), |
421 | JSON_BUILD_PAIR("flags", JSON_BUILD_UNSIGNED(query_flags())))); | |
4d1cf1e2 LP |
422 | if (r < 0) |
423 | goto fail; | |
424 | ||
75d2f0a0 | 425 | const char *error_id; |
0c73f4f0 | 426 | r = varlink_call(link, "io.systemd.Resolve.ResolveHostname", cparams, &rparams, &error_id, NULL); |
3c229a9a YW |
427 | if (r < 0) |
428 | goto fail; | |
429 | if (!isempty(error_id)) { | |
ae78529f LP |
430 | if (error_shall_try_again(error_id)) |
431 | goto try_again; | |
432 | if (error_shall_fallback(error_id)) | |
433 | goto fail; | |
cb4e5d51 MP |
434 | if (streq(error_id, "io.systemd.Resolve.NoSuchResourceRecord")) |
435 | goto no_data; | |
ae78529f | 436 | goto not_found; |
4d1cf1e2 LP |
437 | } |
438 | ||
f1b622a0 | 439 | r = json_dispatch(rparams, resolve_hostname_reply_dispatch_table, json_dispatch_flags, &p); |
0c73f4f0 | 440 | if (r < 0) |
4d1cf1e2 | 441 | goto fail; |
0c73f4f0 | 442 | if (json_variant_is_blank_object(p.addresses)) |
06202b9e | 443 | goto not_found; |
4d1cf1e2 | 444 | |
75d2f0a0 | 445 | size_t n_addresses = 0; |
0c73f4f0 LP |
446 | JSON_VARIANT_ARRAY_FOREACH(entry, p.addresses) { |
447 | AddressParameters q = {}; | |
448 | ||
f1b622a0 | 449 | r = json_dispatch(entry, address_parameters_dispatch_table, json_dispatch_flags, &q); |
0c73f4f0 LP |
450 | if (r < 0) |
451 | goto fail; | |
452 | ||
453 | if (!IN_SET(q.family, AF_INET, AF_INET6)) | |
454 | continue; | |
455 | ||
456 | if (q.address_size != FAMILY_ADDRESS_SIZE(q.family)) { | |
457 | r = -EINVAL; | |
458 | goto fail; | |
459 | } | |
460 | ||
75d2f0a0 | 461 | n_addresses++; |
0c73f4f0 LP |
462 | } |
463 | ||
75d2f0a0 | 464 | const char *canonical = p.name ?: name; |
309e9d86 | 465 | |
75d2f0a0 ZJS |
466 | size_t alen = FAMILY_ADDRESS_SIZE(af); |
467 | size_t l = strlen(canonical); | |
4d1cf1e2 | 468 | |
75d2f0a0 | 469 | size_t idx, ms = ALIGN(l + 1) + n_addresses * ALIGN(alen) + (n_addresses + 2) * sizeof(char*); |
4d1cf1e2 LP |
470 | |
471 | if (buflen < ms) { | |
cdccd29f | 472 | UNPROTECT_ERRNO; |
0192cbdb | 473 | *errnop = ERANGE; |
e36c6e48 | 474 | *h_errnop = NETDB_INTERNAL; |
4d1cf1e2 LP |
475 | return NSS_STATUS_TRYAGAIN; |
476 | } | |
477 | ||
478 | /* First, append name */ | |
75d2f0a0 | 479 | char *r_name = buffer; |
309e9d86 | 480 | memcpy(r_name, canonical, l+1); |
4d1cf1e2 LP |
481 | idx = ALIGN(l+1); |
482 | ||
309e9d86 | 483 | /* Second, create empty aliases array */ |
75d2f0a0 | 484 | char *r_aliases = buffer + idx; |
4d1cf1e2 LP |
485 | ((char**) r_aliases)[0] = NULL; |
486 | idx += sizeof(char*); | |
487 | ||
488 | /* Third, append addresses */ | |
75d2f0a0 | 489 | char *r_addr = buffer + idx; |
309e9d86 | 490 | |
75d2f0a0 | 491 | size_t i = 0; |
0c73f4f0 LP |
492 | JSON_VARIANT_ARRAY_FOREACH(entry, p.addresses) { |
493 | AddressParameters q = {}; | |
4d1cf1e2 | 494 | |
f1b622a0 | 495 | r = json_dispatch(entry, address_parameters_dispatch_table, json_dispatch_flags, &q); |
4d1cf1e2 LP |
496 | if (r < 0) |
497 | goto fail; | |
498 | ||
0c73f4f0 | 499 | if (q.family != af) |
4d1cf1e2 LP |
500 | continue; |
501 | ||
0c73f4f0 | 502 | if (q.address_size != alen) { |
4d1cf1e2 LP |
503 | r = -EINVAL; |
504 | goto fail; | |
505 | } | |
506 | ||
0c73f4f0 | 507 | memcpy(r_addr + i*ALIGN(alen), &q.address, alen); |
4d1cf1e2 LP |
508 | i++; |
509 | } | |
510 | ||
75d2f0a0 ZJS |
511 | assert(i == n_addresses); |
512 | idx += n_addresses * ALIGN(alen); | |
4d1cf1e2 | 513 | |
309e9d86 | 514 | /* Fourth, append address pointer array */ |
75d2f0a0 ZJS |
515 | char *r_addr_list = buffer + idx; |
516 | for (i = 0; i < n_addresses; i++) | |
4d1cf1e2 LP |
517 | ((char**) r_addr_list)[i] = r_addr + i*ALIGN(alen); |
518 | ||
519 | ((char**) r_addr_list)[i] = NULL; | |
75d2f0a0 | 520 | idx += (n_addresses + 1) * sizeof(char*); |
4d1cf1e2 LP |
521 | |
522 | assert(idx == ms); | |
523 | ||
524 | result->h_name = r_name; | |
525 | result->h_aliases = (char**) r_aliases; | |
526 | result->h_addrtype = af; | |
527 | result->h_length = alen; | |
528 | result->h_addr_list = (char**) r_addr_list; | |
529 | ||
530 | if (ttlp) | |
531 | *ttlp = 0; | |
532 | ||
533 | if (canonp) | |
534 | *canonp = r_name; | |
535 | ||
06202b9e YW |
536 | /* Explicitly reset both *h_errnop and h_errno to work around |
537 | * https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */ | |
538 | *h_errnop = NETDB_SUCCESS; | |
539 | h_errno = 0; | |
540 | ||
4d1cf1e2 LP |
541 | return NSS_STATUS_SUCCESS; |
542 | ||
543 | fail: | |
cdccd29f | 544 | UNPROTECT_ERRNO; |
0192cbdb | 545 | *errnop = -r; |
a464cf80 | 546 | *h_errnop = NO_RECOVERY; |
954cba66 | 547 | return NSS_STATUS_UNAVAIL; |
06202b9e YW |
548 | |
549 | not_found: | |
550 | *h_errnop = HOST_NOT_FOUND; | |
551 | return NSS_STATUS_NOTFOUND; | |
ae78529f | 552 | |
cb4e5d51 MP |
553 | no_data: |
554 | *h_errnop = NO_DATA; | |
555 | return NSS_STATUS_NOTFOUND; | |
556 | ||
ae78529f LP |
557 | try_again: |
558 | UNPROTECT_ERRNO; | |
559 | *errnop = -r; | |
560 | *h_errnop = TRY_AGAIN; | |
561 | return NSS_STATUS_TRYAGAIN; | |
4d1cf1e2 LP |
562 | } |
563 | ||
0c73f4f0 LP |
564 | typedef struct ResolveAddressReply { |
565 | JsonVariant *names; | |
566 | uint64_t flags; | |
567 | } ResolveAddressReply; | |
568 | ||
569 | static void resolve_address_reply_destroy(ResolveAddressReply *p) { | |
570 | assert(p); | |
571 | ||
572 | json_variant_unref(p->names); | |
573 | } | |
574 | ||
575 | static const JsonDispatch resolve_address_reply_dispatch_table[] = { | |
576 | { "names", JSON_VARIANT_ARRAY, json_dispatch_variant, offsetof(ResolveAddressReply, names), JSON_MANDATORY }, | |
577 | { "flags", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(ResolveAddressReply, flags), 0 }, | |
578 | {} | |
579 | }; | |
580 | ||
581 | typedef struct NameParameters { | |
582 | int ifindex; | |
583 | char *name; | |
584 | } NameParameters; | |
585 | ||
586 | static void name_parameters_destroy(NameParameters *p) { | |
587 | assert(p); | |
588 | ||
589 | free(p->name); | |
590 | } | |
591 | ||
592 | static const JsonDispatch name_parameters_dispatch_table[] = { | |
77fac974 ZJS |
593 | { "ifindex", JSON_VARIANT_INTEGER, json_dispatch_ifindex, offsetof(NameParameters, ifindex), 0 }, |
594 | { "name", JSON_VARIANT_STRING, json_dispatch_string, offsetof(NameParameters, name), JSON_MANDATORY }, | |
0c73f4f0 LP |
595 | {} |
596 | }; | |
597 | ||
4d1cf1e2 LP |
598 | enum nss_status _nss_resolve_gethostbyaddr2_r( |
599 | const void* addr, socklen_t len, | |
600 | int af, | |
601 | struct hostent *result, | |
602 | char *buffer, size_t buflen, | |
603 | int *errnop, int *h_errnop, | |
604 | int32_t *ttlp) { | |
605 | ||
0c73f4f0 | 606 | _cleanup_(varlink_unrefp) Varlink *link = NULL; |
75d2f0a0 ZJS |
607 | _cleanup_(json_variant_unrefp) JsonVariant *cparams = NULL; |
608 | _cleanup_(resolve_address_reply_destroy) ResolveAddressReply p = {}; | |
77fac974 | 609 | JsonVariant *rparams, *entry; |
0c73f4f0 | 610 | int r; |
4d1cf1e2 | 611 | |
06202b9e | 612 | PROTECT_ERRNO; |
55679e29 | 613 | NSS_ENTRYPOINT_BEGIN; |
0c5eb056 | 614 | |
4d1cf1e2 LP |
615 | assert(addr); |
616 | assert(result); | |
617 | assert(buffer); | |
618 | assert(errnop); | |
619 | assert(h_errnop); | |
620 | ||
621 | if (!IN_SET(af, AF_INET, AF_INET6)) { | |
cdccd29f | 622 | UNPROTECT_ERRNO; |
0192cbdb | 623 | *errnop = EAFNOSUPPORT; |
4d1cf1e2 LP |
624 | *h_errnop = NO_DATA; |
625 | return NSS_STATUS_UNAVAIL; | |
626 | } | |
627 | ||
9d485985 | 628 | if (len != FAMILY_ADDRESS_SIZE(af)) { |
a62fc245 LP |
629 | r = -EINVAL; |
630 | goto fail; | |
4d1cf1e2 LP |
631 | } |
632 | ||
0c73f4f0 | 633 | r = connect_to_resolved(&link); |
4d1cf1e2 LP |
634 | if (r < 0) |
635 | goto fail; | |
636 | ||
0c73f4f0 | 637 | r = json_build(&cparams, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("address", JSON_BUILD_BYTE_ARRAY(addr, len)), |
aee9d18c LP |
638 | JSON_BUILD_PAIR("family", JSON_BUILD_INTEGER(af)), |
639 | JSON_BUILD_PAIR("flags", JSON_BUILD_UNSIGNED(query_flags())))); | |
4d1cf1e2 LP |
640 | if (r < 0) |
641 | goto fail; | |
642 | ||
77fac974 | 643 | const char* error_id; |
0c73f4f0 | 644 | r = varlink_call(link, "io.systemd.Resolve.ResolveAddress", cparams, &rparams, &error_id, NULL); |
3c229a9a YW |
645 | if (r < 0) |
646 | goto fail; | |
647 | if (!isempty(error_id)) { | |
ae78529f LP |
648 | if (error_shall_try_again(error_id)) |
649 | goto try_again; | |
650 | if (error_shall_fallback(error_id)) | |
651 | goto fail; | |
652 | goto not_found; | |
4d1cf1e2 LP |
653 | } |
654 | ||
f1b622a0 | 655 | r = json_dispatch(rparams, resolve_address_reply_dispatch_table, json_dispatch_flags, &p); |
51323288 LP |
656 | if (r < 0) |
657 | goto fail; | |
0c73f4f0 LP |
658 | if (json_variant_is_blank_object(p.names)) |
659 | goto not_found; | |
51323288 | 660 | |
77fac974 ZJS |
661 | size_t ms = 0, idx; |
662 | ||
0c73f4f0 LP |
663 | JSON_VARIANT_ARRAY_FOREACH(entry, p.names) { |
664 | _cleanup_(name_parameters_destroy) NameParameters q = {}; | |
51323288 | 665 | |
f1b622a0 | 666 | r = json_dispatch(entry, name_parameters_dispatch_table, json_dispatch_flags, &q); |
0c73f4f0 | 667 | if (r < 0) |
78c6a153 | 668 | goto fail; |
4d1cf1e2 | 669 | |
0c73f4f0 | 670 | ms += ALIGN(strlen(q.name) + 1); |
4d1cf1e2 | 671 | } |
4d1cf1e2 | 672 | |
77fac974 ZJS |
673 | size_t n_names = json_variant_elements(p.names); |
674 | ms += ALIGN(len) + /* the address */ | |
675 | 2 * sizeof(char*) + /* pointer to the address, plus trailing NULL */ | |
676 | n_names * sizeof(char*); /* pointers to aliases, plus trailing NULL */ | |
4d1cf1e2 LP |
677 | |
678 | if (buflen < ms) { | |
cdccd29f | 679 | UNPROTECT_ERRNO; |
0192cbdb | 680 | *errnop = ERANGE; |
e36c6e48 | 681 | *h_errnop = NETDB_INTERNAL; |
4d1cf1e2 LP |
682 | return NSS_STATUS_TRYAGAIN; |
683 | } | |
684 | ||
685 | /* First, place address */ | |
77fac974 | 686 | char *r_addr = buffer; |
4d1cf1e2 LP |
687 | memcpy(r_addr, addr, len); |
688 | idx = ALIGN(len); | |
689 | ||
690 | /* Second, place address list */ | |
77fac974 | 691 | char *r_addr_list = buffer + idx; |
4d1cf1e2 LP |
692 | ((char**) r_addr_list)[0] = r_addr; |
693 | ((char**) r_addr_list)[1] = NULL; | |
694 | idx += sizeof(char*) * 2; | |
695 | ||
77fac974 ZJS |
696 | /* Third, reserve space for the aliases array, plus trailing NULL */ |
697 | char *r_aliases = buffer + idx; | |
698 | idx += sizeof(char*) * n_names; | |
4d1cf1e2 LP |
699 | |
700 | /* Fourth, place aliases */ | |
77fac974 ZJS |
701 | char *r_name = buffer + idx; |
702 | ||
703 | size_t i = 0; | |
0c73f4f0 LP |
704 | JSON_VARIANT_ARRAY_FOREACH(entry, p.names) { |
705 | _cleanup_(name_parameters_destroy) NameParameters q = {}; | |
4d1cf1e2 | 706 | |
f1b622a0 | 707 | r = json_dispatch(entry, name_parameters_dispatch_table, json_dispatch_flags, &q); |
0c73f4f0 LP |
708 | if (r < 0) |
709 | goto fail; | |
710 | ||
77fac974 ZJS |
711 | size_t l = strlen(q.name); |
712 | char *z = buffer + idx; | |
713 | memcpy(z, q.name, l + 1); | |
4d1cf1e2 | 714 | |
963783d7 | 715 | if (i > 0) |
77fac974 | 716 | ((char**) r_aliases)[i - 1] = z; |
4d1cf1e2 LP |
717 | i++; |
718 | ||
77fac974 | 719 | idx += ALIGN(l + 1); |
4d1cf1e2 | 720 | } |
77fac974 | 721 | ((char**) r_aliases)[n_names - 1] = NULL; |
4d1cf1e2 | 722 | |
4d1cf1e2 LP |
723 | assert(idx == ms); |
724 | ||
725 | result->h_name = r_name; | |
726 | result->h_aliases = (char**) r_aliases; | |
727 | result->h_addrtype = af; | |
728 | result->h_length = len; | |
729 | result->h_addr_list = (char**) r_addr_list; | |
730 | ||
731 | if (ttlp) | |
732 | *ttlp = 0; | |
733 | ||
06202b9e YW |
734 | /* Explicitly reset both *h_errnop and h_errno to work around |
735 | * https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */ | |
e70df46b LP |
736 | *h_errnop = NETDB_SUCCESS; |
737 | h_errno = 0; | |
738 | ||
4d1cf1e2 LP |
739 | return NSS_STATUS_SUCCESS; |
740 | ||
741 | fail: | |
cdccd29f | 742 | UNPROTECT_ERRNO; |
0192cbdb | 743 | *errnop = -r; |
a464cf80 | 744 | *h_errnop = NO_RECOVERY; |
954cba66 | 745 | return NSS_STATUS_UNAVAIL; |
06202b9e YW |
746 | |
747 | not_found: | |
748 | *h_errnop = HOST_NOT_FOUND; | |
749 | return NSS_STATUS_NOTFOUND; | |
ae78529f LP |
750 | |
751 | try_again: | |
752 | UNPROTECT_ERRNO; | |
753 | *errnop = -r; | |
754 | *h_errnop = TRY_AGAIN; | |
755 | return NSS_STATUS_TRYAGAIN; | |
4d1cf1e2 LP |
756 | } |
757 | ||
758 | NSS_GETHOSTBYNAME_FALLBACKS(resolve); | |
759 | NSS_GETHOSTBYADDR_FALLBACKS(resolve); |