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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; | |
272 | goto not_found; | |
4d1cf1e2 LP |
273 | } |
274 | ||
55679e29 | 275 | r = json_dispatch(rparams, resolve_hostname_reply_dispatch_table, NULL, json_dispatch_flags, &p); |
0c73f4f0 | 276 | if (r < 0) |
4d1cf1e2 | 277 | goto fail; |
0c73f4f0 | 278 | if (json_variant_is_blank_object(p.addresses)) |
06202b9e | 279 | goto not_found; |
4d1cf1e2 | 280 | |
75d2f0a0 | 281 | size_t n_addresses = 0; |
0c73f4f0 LP |
282 | JSON_VARIANT_ARRAY_FOREACH(entry, p.addresses) { |
283 | AddressParameters q = {}; | |
284 | ||
55679e29 | 285 | r = json_dispatch(entry, address_parameters_dispatch_table, NULL, json_dispatch_flags, &q); |
0c73f4f0 LP |
286 | if (r < 0) |
287 | goto fail; | |
288 | ||
289 | if (!IN_SET(q.family, AF_INET, AF_INET6)) | |
290 | continue; | |
291 | ||
292 | if (q.address_size != FAMILY_ADDRESS_SIZE(q.family)) { | |
293 | r = -EINVAL; | |
294 | goto fail; | |
295 | } | |
296 | ||
75d2f0a0 | 297 | n_addresses++; |
0c73f4f0 LP |
298 | } |
299 | ||
75d2f0a0 ZJS |
300 | const char *canonical = p.name ?: name; |
301 | size_t l = strlen(canonical); | |
302 | size_t idx, ms = ALIGN(l+1) + ALIGN(sizeof(struct gaih_addrtuple)) * n_addresses; | |
309e9d86 | 303 | |
4d1cf1e2 | 304 | if (buflen < ms) { |
cdccd29f | 305 | UNPROTECT_ERRNO; |
0192cbdb | 306 | *errnop = ERANGE; |
e36c6e48 | 307 | *h_errnop = NETDB_INTERNAL; |
4d1cf1e2 LP |
308 | return NSS_STATUS_TRYAGAIN; |
309 | } | |
310 | ||
311 | /* First, append name */ | |
75d2f0a0 ZJS |
312 | char *r_name = buffer; |
313 | memcpy(r_name, canonical, l + 1); | |
314 | idx = ALIGN(l + 1); | |
4d1cf1e2 LP |
315 | |
316 | /* Second, append addresses */ | |
75d2f0a0 ZJS |
317 | struct gaih_addrtuple *r_tuple = NULL, |
318 | *r_tuple_first = (struct gaih_addrtuple*) (buffer + idx); | |
309e9d86 | 319 | |
0c73f4f0 LP |
320 | JSON_VARIANT_ARRAY_FOREACH(entry, p.addresses) { |
321 | AddressParameters q = {}; | |
78c6a153 | 322 | |
55679e29 | 323 | r = json_dispatch(entry, address_parameters_dispatch_table, NULL, json_dispatch_flags, &q); |
4d1cf1e2 LP |
324 | if (r < 0) |
325 | goto fail; | |
326 | ||
0c73f4f0 | 327 | if (!IN_SET(q.family, AF_INET, AF_INET6)) |
4d1cf1e2 LP |
328 | continue; |
329 | ||
4d1cf1e2 | 330 | r_tuple = (struct gaih_addrtuple*) (buffer + idx); |
0c73f4f0 | 331 | r_tuple->next = (struct gaih_addrtuple*) ((char*) r_tuple + ALIGN(sizeof(struct gaih_addrtuple))); |
4d1cf1e2 | 332 | r_tuple->name = r_name; |
0c73f4f0 LP |
333 | r_tuple->family = q.family; |
334 | r_tuple->scopeid = ifindex_to_scopeid(q.family, &q.address, q.ifindex); | |
335 | memcpy(r_tuple->addr, &q.address, q.address_size); | |
4d1cf1e2 LP |
336 | |
337 | idx += ALIGN(sizeof(struct gaih_addrtuple)); | |
4d1cf1e2 | 338 | } |
4d1cf1e2 | 339 | |
75d2f0a0 | 340 | assert(r_tuple); /* We had at least one address, so r_tuple must be set */ |
0c73f4f0 LP |
341 | r_tuple->next = NULL; /* Override last next pointer */ |
342 | ||
4d1cf1e2 LP |
343 | assert(idx == ms); |
344 | ||
345 | if (*pat) | |
346 | **pat = *r_tuple_first; | |
347 | else | |
348 | *pat = r_tuple_first; | |
349 | ||
350 | if (ttlp) | |
351 | *ttlp = 0; | |
352 | ||
06202b9e YW |
353 | /* Explicitly reset both *h_errnop and h_errno to work around |
354 | * https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */ | |
e70df46b LP |
355 | *h_errnop = NETDB_SUCCESS; |
356 | h_errno = 0; | |
357 | ||
4d1cf1e2 LP |
358 | return NSS_STATUS_SUCCESS; |
359 | ||
360 | fail: | |
cdccd29f | 361 | UNPROTECT_ERRNO; |
0192cbdb | 362 | *errnop = -r; |
a464cf80 | 363 | *h_errnop = NO_RECOVERY; |
954cba66 | 364 | return NSS_STATUS_UNAVAIL; |
06202b9e YW |
365 | |
366 | not_found: | |
367 | *h_errnop = HOST_NOT_FOUND; | |
368 | return NSS_STATUS_NOTFOUND; | |
ae78529f LP |
369 | |
370 | try_again: | |
371 | UNPROTECT_ERRNO; | |
372 | *errnop = -r; | |
373 | *h_errnop = TRY_AGAIN; | |
374 | return NSS_STATUS_TRYAGAIN; | |
4d1cf1e2 LP |
375 | } |
376 | ||
377 | enum nss_status _nss_resolve_gethostbyname3_r( | |
378 | const char *name, | |
379 | int af, | |
380 | struct hostent *result, | |
381 | char *buffer, size_t buflen, | |
382 | int *errnop, int *h_errnop, | |
383 | int32_t *ttlp, | |
384 | char **canonp) { | |
385 | ||
0c73f4f0 | 386 | _cleanup_(varlink_unrefp) Varlink *link = NULL; |
75d2f0a0 ZJS |
387 | _cleanup_(json_variant_unrefp) JsonVariant *cparams = NULL; |
388 | _cleanup_(resolve_hostname_reply_destroy) ResolveHostnameReply p = {}; | |
389 | JsonVariant *rparams, *entry; | |
0c73f4f0 | 390 | int r; |
4d1cf1e2 | 391 | |
06202b9e | 392 | PROTECT_ERRNO; |
55679e29 | 393 | NSS_ENTRYPOINT_BEGIN; |
0c5eb056 | 394 | |
4d1cf1e2 LP |
395 | assert(name); |
396 | assert(result); | |
397 | assert(buffer); | |
398 | assert(errnop); | |
399 | assert(h_errnop); | |
400 | ||
401 | if (af == AF_UNSPEC) | |
402 | af = AF_INET; | |
403 | ||
4c701096 | 404 | if (!IN_SET(af, AF_INET, AF_INET6)) { |
4d1cf1e2 LP |
405 | r = -EAFNOSUPPORT; |
406 | goto fail; | |
407 | } | |
408 | ||
0c73f4f0 | 409 | r = connect_to_resolved(&link); |
4d1cf1e2 LP |
410 | if (r < 0) |
411 | goto fail; | |
412 | ||
0c73f4f0 | 413 | r = json_build(&cparams, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("name", JSON_BUILD_STRING(name)), |
aee9d18c LP |
414 | JSON_BUILD_PAIR("family", JSON_BUILD_INTEGER(af)), |
415 | JSON_BUILD_PAIR("flags", JSON_BUILD_UNSIGNED(query_flags())))); | |
4d1cf1e2 LP |
416 | if (r < 0) |
417 | goto fail; | |
418 | ||
75d2f0a0 | 419 | const char *error_id; |
0c73f4f0 | 420 | r = varlink_call(link, "io.systemd.Resolve.ResolveHostname", cparams, &rparams, &error_id, NULL); |
3c229a9a YW |
421 | if (r < 0) |
422 | goto fail; | |
423 | if (!isempty(error_id)) { | |
ae78529f LP |
424 | if (error_shall_try_again(error_id)) |
425 | goto try_again; | |
426 | if (error_shall_fallback(error_id)) | |
427 | goto fail; | |
428 | goto not_found; | |
4d1cf1e2 LP |
429 | } |
430 | ||
55679e29 | 431 | r = json_dispatch(rparams, resolve_hostname_reply_dispatch_table, NULL, json_dispatch_flags, &p); |
0c73f4f0 | 432 | if (r < 0) |
4d1cf1e2 | 433 | goto fail; |
0c73f4f0 | 434 | if (json_variant_is_blank_object(p.addresses)) |
06202b9e | 435 | goto not_found; |
4d1cf1e2 | 436 | |
75d2f0a0 | 437 | size_t n_addresses = 0; |
0c73f4f0 LP |
438 | JSON_VARIANT_ARRAY_FOREACH(entry, p.addresses) { |
439 | AddressParameters q = {}; | |
440 | ||
55679e29 | 441 | r = json_dispatch(entry, address_parameters_dispatch_table, NULL, json_dispatch_flags, &q); |
0c73f4f0 LP |
442 | if (r < 0) |
443 | goto fail; | |
444 | ||
445 | if (!IN_SET(q.family, AF_INET, AF_INET6)) | |
446 | continue; | |
447 | ||
448 | if (q.address_size != FAMILY_ADDRESS_SIZE(q.family)) { | |
449 | r = -EINVAL; | |
450 | goto fail; | |
451 | } | |
452 | ||
75d2f0a0 | 453 | n_addresses++; |
0c73f4f0 LP |
454 | } |
455 | ||
75d2f0a0 | 456 | const char *canonical = p.name ?: name; |
309e9d86 | 457 | |
75d2f0a0 ZJS |
458 | size_t alen = FAMILY_ADDRESS_SIZE(af); |
459 | size_t l = strlen(canonical); | |
4d1cf1e2 | 460 | |
75d2f0a0 | 461 | size_t idx, ms = ALIGN(l + 1) + n_addresses * ALIGN(alen) + (n_addresses + 2) * sizeof(char*); |
4d1cf1e2 LP |
462 | |
463 | if (buflen < ms) { | |
cdccd29f | 464 | UNPROTECT_ERRNO; |
0192cbdb | 465 | *errnop = ERANGE; |
e36c6e48 | 466 | *h_errnop = NETDB_INTERNAL; |
4d1cf1e2 LP |
467 | return NSS_STATUS_TRYAGAIN; |
468 | } | |
469 | ||
470 | /* First, append name */ | |
75d2f0a0 | 471 | char *r_name = buffer; |
309e9d86 | 472 | memcpy(r_name, canonical, l+1); |
4d1cf1e2 LP |
473 | idx = ALIGN(l+1); |
474 | ||
309e9d86 | 475 | /* Second, create empty aliases array */ |
75d2f0a0 | 476 | char *r_aliases = buffer + idx; |
4d1cf1e2 LP |
477 | ((char**) r_aliases)[0] = NULL; |
478 | idx += sizeof(char*); | |
479 | ||
480 | /* Third, append addresses */ | |
75d2f0a0 | 481 | char *r_addr = buffer + idx; |
309e9d86 | 482 | |
75d2f0a0 | 483 | size_t i = 0; |
0c73f4f0 LP |
484 | JSON_VARIANT_ARRAY_FOREACH(entry, p.addresses) { |
485 | AddressParameters q = {}; | |
4d1cf1e2 | 486 | |
55679e29 | 487 | r = json_dispatch(entry, address_parameters_dispatch_table, NULL, json_dispatch_flags, &q); |
4d1cf1e2 LP |
488 | if (r < 0) |
489 | goto fail; | |
490 | ||
0c73f4f0 | 491 | if (q.family != af) |
4d1cf1e2 LP |
492 | continue; |
493 | ||
0c73f4f0 | 494 | if (q.address_size != alen) { |
4d1cf1e2 LP |
495 | r = -EINVAL; |
496 | goto fail; | |
497 | } | |
498 | ||
0c73f4f0 | 499 | memcpy(r_addr + i*ALIGN(alen), &q.address, alen); |
4d1cf1e2 LP |
500 | i++; |
501 | } | |
502 | ||
75d2f0a0 ZJS |
503 | assert(i == n_addresses); |
504 | idx += n_addresses * ALIGN(alen); | |
4d1cf1e2 | 505 | |
309e9d86 | 506 | /* Fourth, append address pointer array */ |
75d2f0a0 ZJS |
507 | char *r_addr_list = buffer + idx; |
508 | for (i = 0; i < n_addresses; i++) | |
4d1cf1e2 LP |
509 | ((char**) r_addr_list)[i] = r_addr + i*ALIGN(alen); |
510 | ||
511 | ((char**) r_addr_list)[i] = NULL; | |
75d2f0a0 | 512 | idx += (n_addresses + 1) * sizeof(char*); |
4d1cf1e2 LP |
513 | |
514 | assert(idx == ms); | |
515 | ||
516 | result->h_name = r_name; | |
517 | result->h_aliases = (char**) r_aliases; | |
518 | result->h_addrtype = af; | |
519 | result->h_length = alen; | |
520 | result->h_addr_list = (char**) r_addr_list; | |
521 | ||
522 | if (ttlp) | |
523 | *ttlp = 0; | |
524 | ||
525 | if (canonp) | |
526 | *canonp = r_name; | |
527 | ||
06202b9e YW |
528 | /* Explicitly reset both *h_errnop and h_errno to work around |
529 | * https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */ | |
530 | *h_errnop = NETDB_SUCCESS; | |
531 | h_errno = 0; | |
532 | ||
4d1cf1e2 LP |
533 | return NSS_STATUS_SUCCESS; |
534 | ||
535 | fail: | |
cdccd29f | 536 | UNPROTECT_ERRNO; |
0192cbdb | 537 | *errnop = -r; |
a464cf80 | 538 | *h_errnop = NO_RECOVERY; |
954cba66 | 539 | return NSS_STATUS_UNAVAIL; |
06202b9e YW |
540 | |
541 | not_found: | |
542 | *h_errnop = HOST_NOT_FOUND; | |
543 | return NSS_STATUS_NOTFOUND; | |
ae78529f LP |
544 | |
545 | try_again: | |
546 | UNPROTECT_ERRNO; | |
547 | *errnop = -r; | |
548 | *h_errnop = TRY_AGAIN; | |
549 | return NSS_STATUS_TRYAGAIN; | |
4d1cf1e2 LP |
550 | } |
551 | ||
0c73f4f0 LP |
552 | typedef struct ResolveAddressReply { |
553 | JsonVariant *names; | |
554 | uint64_t flags; | |
555 | } ResolveAddressReply; | |
556 | ||
557 | static void resolve_address_reply_destroy(ResolveAddressReply *p) { | |
558 | assert(p); | |
559 | ||
560 | json_variant_unref(p->names); | |
561 | } | |
562 | ||
563 | static const JsonDispatch resolve_address_reply_dispatch_table[] = { | |
564 | { "names", JSON_VARIANT_ARRAY, json_dispatch_variant, offsetof(ResolveAddressReply, names), JSON_MANDATORY }, | |
565 | { "flags", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(ResolveAddressReply, flags), 0 }, | |
566 | {} | |
567 | }; | |
568 | ||
569 | typedef struct NameParameters { | |
570 | int ifindex; | |
571 | char *name; | |
572 | } NameParameters; | |
573 | ||
574 | static void name_parameters_destroy(NameParameters *p) { | |
575 | assert(p); | |
576 | ||
577 | free(p->name); | |
578 | } | |
579 | ||
580 | static const JsonDispatch name_parameters_dispatch_table[] = { | |
77fac974 ZJS |
581 | { "ifindex", JSON_VARIANT_INTEGER, json_dispatch_ifindex, offsetof(NameParameters, ifindex), 0 }, |
582 | { "name", JSON_VARIANT_STRING, json_dispatch_string, offsetof(NameParameters, name), JSON_MANDATORY }, | |
0c73f4f0 LP |
583 | {} |
584 | }; | |
585 | ||
4d1cf1e2 LP |
586 | enum nss_status _nss_resolve_gethostbyaddr2_r( |
587 | const void* addr, socklen_t len, | |
588 | int af, | |
589 | struct hostent *result, | |
590 | char *buffer, size_t buflen, | |
591 | int *errnop, int *h_errnop, | |
592 | int32_t *ttlp) { | |
593 | ||
0c73f4f0 | 594 | _cleanup_(varlink_unrefp) Varlink *link = NULL; |
75d2f0a0 ZJS |
595 | _cleanup_(json_variant_unrefp) JsonVariant *cparams = NULL; |
596 | _cleanup_(resolve_address_reply_destroy) ResolveAddressReply p = {}; | |
77fac974 | 597 | JsonVariant *rparams, *entry; |
0c73f4f0 | 598 | int r; |
4d1cf1e2 | 599 | |
06202b9e | 600 | PROTECT_ERRNO; |
55679e29 | 601 | NSS_ENTRYPOINT_BEGIN; |
0c5eb056 | 602 | |
4d1cf1e2 LP |
603 | assert(addr); |
604 | assert(result); | |
605 | assert(buffer); | |
606 | assert(errnop); | |
607 | assert(h_errnop); | |
608 | ||
609 | if (!IN_SET(af, AF_INET, AF_INET6)) { | |
cdccd29f | 610 | UNPROTECT_ERRNO; |
0192cbdb | 611 | *errnop = EAFNOSUPPORT; |
4d1cf1e2 LP |
612 | *h_errnop = NO_DATA; |
613 | return NSS_STATUS_UNAVAIL; | |
614 | } | |
615 | ||
9d485985 | 616 | if (len != FAMILY_ADDRESS_SIZE(af)) { |
a62fc245 LP |
617 | r = -EINVAL; |
618 | goto fail; | |
4d1cf1e2 LP |
619 | } |
620 | ||
0c73f4f0 | 621 | r = connect_to_resolved(&link); |
4d1cf1e2 LP |
622 | if (r < 0) |
623 | goto fail; | |
624 | ||
0c73f4f0 | 625 | r = json_build(&cparams, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("address", JSON_BUILD_BYTE_ARRAY(addr, len)), |
aee9d18c LP |
626 | JSON_BUILD_PAIR("family", JSON_BUILD_INTEGER(af)), |
627 | JSON_BUILD_PAIR("flags", JSON_BUILD_UNSIGNED(query_flags())))); | |
4d1cf1e2 LP |
628 | if (r < 0) |
629 | goto fail; | |
630 | ||
77fac974 | 631 | const char* error_id; |
0c73f4f0 | 632 | r = varlink_call(link, "io.systemd.Resolve.ResolveAddress", cparams, &rparams, &error_id, NULL); |
3c229a9a YW |
633 | if (r < 0) |
634 | goto fail; | |
635 | if (!isempty(error_id)) { | |
ae78529f LP |
636 | if (error_shall_try_again(error_id)) |
637 | goto try_again; | |
638 | if (error_shall_fallback(error_id)) | |
639 | goto fail; | |
640 | goto not_found; | |
4d1cf1e2 LP |
641 | } |
642 | ||
55679e29 | 643 | r = json_dispatch(rparams, resolve_address_reply_dispatch_table, NULL, json_dispatch_flags, &p); |
51323288 LP |
644 | if (r < 0) |
645 | goto fail; | |
0c73f4f0 LP |
646 | if (json_variant_is_blank_object(p.names)) |
647 | goto not_found; | |
51323288 | 648 | |
77fac974 ZJS |
649 | size_t ms = 0, idx; |
650 | ||
0c73f4f0 LP |
651 | JSON_VARIANT_ARRAY_FOREACH(entry, p.names) { |
652 | _cleanup_(name_parameters_destroy) NameParameters q = {}; | |
51323288 | 653 | |
55679e29 | 654 | r = json_dispatch(entry, name_parameters_dispatch_table, NULL, json_dispatch_flags, &q); |
0c73f4f0 | 655 | if (r < 0) |
78c6a153 | 656 | goto fail; |
4d1cf1e2 | 657 | |
0c73f4f0 | 658 | ms += ALIGN(strlen(q.name) + 1); |
4d1cf1e2 | 659 | } |
4d1cf1e2 | 660 | |
77fac974 ZJS |
661 | size_t n_names = json_variant_elements(p.names); |
662 | ms += ALIGN(len) + /* the address */ | |
663 | 2 * sizeof(char*) + /* pointer to the address, plus trailing NULL */ | |
664 | n_names * sizeof(char*); /* pointers to aliases, plus trailing NULL */ | |
4d1cf1e2 LP |
665 | |
666 | if (buflen < ms) { | |
cdccd29f | 667 | UNPROTECT_ERRNO; |
0192cbdb | 668 | *errnop = ERANGE; |
e36c6e48 | 669 | *h_errnop = NETDB_INTERNAL; |
4d1cf1e2 LP |
670 | return NSS_STATUS_TRYAGAIN; |
671 | } | |
672 | ||
673 | /* First, place address */ | |
77fac974 | 674 | char *r_addr = buffer; |
4d1cf1e2 LP |
675 | memcpy(r_addr, addr, len); |
676 | idx = ALIGN(len); | |
677 | ||
678 | /* Second, place address list */ | |
77fac974 | 679 | char *r_addr_list = buffer + idx; |
4d1cf1e2 LP |
680 | ((char**) r_addr_list)[0] = r_addr; |
681 | ((char**) r_addr_list)[1] = NULL; | |
682 | idx += sizeof(char*) * 2; | |
683 | ||
77fac974 ZJS |
684 | /* Third, reserve space for the aliases array, plus trailing NULL */ |
685 | char *r_aliases = buffer + idx; | |
686 | idx += sizeof(char*) * n_names; | |
4d1cf1e2 LP |
687 | |
688 | /* Fourth, place aliases */ | |
77fac974 ZJS |
689 | char *r_name = buffer + idx; |
690 | ||
691 | size_t i = 0; | |
0c73f4f0 LP |
692 | JSON_VARIANT_ARRAY_FOREACH(entry, p.names) { |
693 | _cleanup_(name_parameters_destroy) NameParameters q = {}; | |
4d1cf1e2 | 694 | |
55679e29 | 695 | r = json_dispatch(entry, name_parameters_dispatch_table, NULL, json_dispatch_flags, &q); |
0c73f4f0 LP |
696 | if (r < 0) |
697 | goto fail; | |
698 | ||
77fac974 ZJS |
699 | size_t l = strlen(q.name); |
700 | char *z = buffer + idx; | |
701 | memcpy(z, q.name, l + 1); | |
4d1cf1e2 | 702 | |
963783d7 | 703 | if (i > 0) |
77fac974 | 704 | ((char**) r_aliases)[i - 1] = z; |
4d1cf1e2 LP |
705 | i++; |
706 | ||
77fac974 | 707 | idx += ALIGN(l + 1); |
4d1cf1e2 | 708 | } |
77fac974 | 709 | ((char**) r_aliases)[n_names - 1] = NULL; |
4d1cf1e2 | 710 | |
4d1cf1e2 LP |
711 | assert(idx == ms); |
712 | ||
713 | result->h_name = r_name; | |
714 | result->h_aliases = (char**) r_aliases; | |
715 | result->h_addrtype = af; | |
716 | result->h_length = len; | |
717 | result->h_addr_list = (char**) r_addr_list; | |
718 | ||
719 | if (ttlp) | |
720 | *ttlp = 0; | |
721 | ||
06202b9e YW |
722 | /* Explicitly reset both *h_errnop and h_errno to work around |
723 | * https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */ | |
e70df46b LP |
724 | *h_errnop = NETDB_SUCCESS; |
725 | h_errno = 0; | |
726 | ||
4d1cf1e2 LP |
727 | return NSS_STATUS_SUCCESS; |
728 | ||
729 | fail: | |
cdccd29f | 730 | UNPROTECT_ERRNO; |
0192cbdb | 731 | *errnop = -r; |
a464cf80 | 732 | *h_errnop = NO_RECOVERY; |
954cba66 | 733 | return NSS_STATUS_UNAVAIL; |
06202b9e YW |
734 | |
735 | not_found: | |
736 | *h_errnop = HOST_NOT_FOUND; | |
737 | return NSS_STATUS_NOTFOUND; | |
ae78529f LP |
738 | |
739 | try_again: | |
740 | UNPROTECT_ERRNO; | |
741 | *errnop = -r; | |
742 | *h_errnop = TRY_AGAIN; | |
743 | return NSS_STATUS_TRYAGAIN; | |
4d1cf1e2 LP |
744 | } |
745 | ||
746 | NSS_GETHOSTBYNAME_FALLBACKS(resolve); | |
747 | NSS_GETHOSTBYADDR_FALLBACKS(resolve); |