]>
Commit | Line | Data |
---|---|---|
db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
6b21f0cf | 2 | |
6b21f0cf | 3 | #include <errno.h> |
4e8c8252 | 4 | #include <net/if.h> |
07630cea LP |
5 | #include <netdb.h> |
6 | #include <nss.h> | |
8041b5ba | 7 | #include <stdlib.h> |
8041b5ba | 8 | |
b5efdb8a | 9 | #include "alloc-util.h" |
2b2fec7d | 10 | #include "errno-util.h" |
07630cea | 11 | #include "hostname-util.h" |
e80af1bd | 12 | #include "local-addresses.h" |
1c633045 | 13 | #include "macro.h" |
c9fdc26e | 14 | #include "nss-util.h" |
0c5eb056 | 15 | #include "signal-util.h" |
07630cea | 16 | #include "string-util.h" |
4e8c8252 LP |
17 | |
18 | /* We use 127.0.0.2 as IPv4 address. This has the advantage over | |
19 | * 127.0.0.1 that it can be translated back to the local hostname. For | |
20 | * IPv6 we use ::1 which unfortunately will not translate back to the | |
3fdcecc8 | 21 | * hostname but instead something like "localhost" or so. */ |
4e8c8252 | 22 | |
8e38570e | 23 | #define LOCALADDRESS_IPV4 (htobe32(0x7F000002)) |
4e8c8252 | 24 | #define LOCALADDRESS_IPV6 &in6addr_loopback |
4e8c8252 | 25 | |
c9fdc26e LP |
26 | NSS_GETHOSTBYNAME_PROTOTYPES(myhostname); |
27 | NSS_GETHOSTBYADDR_PROTOTYPES(myhostname); | |
8041b5ba | 28 | |
4e8c8252 LP |
29 | enum nss_status _nss_myhostname_gethostbyname4_r( |
30 | const char *name, | |
31 | struct gaih_addrtuple **pat, | |
32 | char *buffer, size_t buflen, | |
33 | int *errnop, int *h_errnop, | |
34 | int32_t *ttlp) { | |
35 | ||
8041b5ba | 36 | struct gaih_addrtuple *r_tuple, *r_tuple_prev = NULL; |
e80af1bd | 37 | _cleanup_free_ struct local_address *addresses = NULL; |
5502f0d9 LP |
38 | _cleanup_free_ char *hn = NULL; |
39 | const char *canonical = NULL; | |
a1077c84 | 40 | int n_addresses = 0; |
e8a7a315 | 41 | uint32_t local_address_ipv4; |
5502f0d9 LP |
42 | size_t l, idx, ms; |
43 | char *r_name; | |
4e8c8252 | 44 | |
06202b9e | 45 | PROTECT_ERRNO; |
0c5eb056 LP |
46 | BLOCK_SIGNALS(NSS_SIGNALS_BLOCK); |
47 | ||
5502f0d9 LP |
48 | assert(name); |
49 | assert(pat); | |
50 | assert(buffer); | |
51 | assert(errnop); | |
52 | assert(h_errnop); | |
53 | ||
54 | if (is_localhost(name)) { | |
a1fdbcbe | 55 | /* We respond to 'localhost', so that /etc/hosts is optional */ |
4e8c8252 | 56 | |
e8a7a315 | 57 | canonical = "localhost"; |
8e38570e | 58 | local_address_ipv4 = htobe32(INADDR_LOOPBACK); |
e9140aff | 59 | |
46a5e0e7 | 60 | } else if (is_gateway_hostname(name)) { |
e9140aff | 61 | |
1d050e1e | 62 | n_addresses = local_gateways(NULL, 0, AF_UNSPEC, &addresses); |
e09e7ac3 LP |
63 | if (n_addresses <= 0) |
64 | goto not_found; | |
e9140aff | 65 | |
5248e7e1 | 66 | canonical = "_gateway"; |
e9140aff | 67 | |
a1fdbcbe LP |
68 | } else if (is_outbound_hostname(name)) { |
69 | ||
70 | n_addresses = local_outbounds(NULL, 0, AF_UNSPEC, &addresses); | |
71 | if (n_addresses <= 0) | |
72 | goto not_found; | |
73 | ||
74 | canonical = "_outbound"; | |
75 | ||
e8a7a315 | 76 | } else { |
5502f0d9 LP |
77 | hn = gethostname_malloc(); |
78 | if (!hn) { | |
cdccd29f | 79 | UNPROTECT_ERRNO; |
0192cbdb | 80 | *errnop = ENOMEM; |
e8a7a315 | 81 | *h_errnop = NO_RECOVERY; |
5502f0d9 | 82 | return NSS_STATUS_TRYAGAIN; |
e8a7a315 LP |
83 | } |
84 | ||
38b38500 | 85 | /* We respond to our local hostname, our hostname suffixed with a single dot. */ |
e09e7ac3 LP |
86 | if (!streq(name, hn) && !streq_ptr(startswith(name, hn), ".")) |
87 | goto not_found; | |
e8a7a315 | 88 | |
1d050e1e | 89 | n_addresses = local_addresses(NULL, 0, AF_UNSPEC, &addresses); |
e80af1bd LP |
90 | if (n_addresses < 0) |
91 | n_addresses = 0; | |
e8a7a315 LP |
92 | |
93 | canonical = hn; | |
94 | local_address_ipv4 = LOCALADDRESS_IPV4; | |
95 | } | |
8041b5ba | 96 | |
e8a7a315 | 97 | l = strlen(canonical); |
5502f0d9 | 98 | ms = ALIGN(l+1) + ALIGN(sizeof(struct gaih_addrtuple)) * (n_addresses > 0 ? n_addresses : 2); |
4e8c8252 | 99 | if (buflen < ms) { |
cdccd29f | 100 | UNPROTECT_ERRNO; |
0192cbdb | 101 | *errnop = ERANGE; |
cda458a5 | 102 | *h_errnop = NETDB_INTERNAL; |
4e8c8252 LP |
103 | return NSS_STATUS_TRYAGAIN; |
104 | } | |
105 | ||
106 | /* First, fill in hostname */ | |
107 | r_name = buffer; | |
e8a7a315 | 108 | memcpy(r_name, canonical, l+1); |
4e8c8252 LP |
109 | idx = ALIGN(l+1); |
110 | ||
68a9c7c4 ZJS |
111 | assert(n_addresses >= 0); |
112 | if (n_addresses == 0) { | |
8041b5ba LP |
113 | /* Second, fill in IPv6 tuple */ |
114 | r_tuple = (struct gaih_addrtuple*) (buffer + idx); | |
115 | r_tuple->next = r_tuple_prev; | |
116 | r_tuple->name = r_name; | |
117 | r_tuple->family = AF_INET6; | |
118 | memcpy(r_tuple->addr, LOCALADDRESS_IPV6, 16); | |
a1077c84 | 119 | r_tuple->scopeid = 0; |
8041b5ba LP |
120 | |
121 | idx += ALIGN(sizeof(struct gaih_addrtuple)); | |
122 | r_tuple_prev = r_tuple; | |
123 | ||
124 | /* Third, fill in IPv4 tuple */ | |
125 | r_tuple = (struct gaih_addrtuple*) (buffer + idx); | |
126 | r_tuple->next = r_tuple_prev; | |
127 | r_tuple->name = r_name; | |
128 | r_tuple->family = AF_INET; | |
e8a7a315 | 129 | *(uint32_t*) r_tuple->addr = local_address_ipv4; |
a1077c84 | 130 | r_tuple->scopeid = 0; |
8041b5ba LP |
131 | |
132 | idx += ALIGN(sizeof(struct gaih_addrtuple)); | |
133 | r_tuple_prev = r_tuple; | |
134 | } | |
135 | ||
136 | /* Fourth, fill actual addresses in, but in backwards order */ | |
92e9df9c YW |
137 | for (int i = n_addresses; i > 0; i--) { |
138 | struct local_address *a = addresses + i - 1; | |
139 | ||
8041b5ba LP |
140 | r_tuple = (struct gaih_addrtuple*) (buffer + idx); |
141 | r_tuple->next = r_tuple_prev; | |
142 | r_tuple->name = r_name; | |
143 | r_tuple->family = a->family; | |
94876904 | 144 | r_tuple->scopeid = a->family == AF_INET6 && in6_addr_is_link_local(&a->address.in6) ? a->ifindex : 0; |
5502f0d9 | 145 | memcpy(r_tuple->addr, &a->address, 16); |
8041b5ba LP |
146 | |
147 | idx += ALIGN(sizeof(struct gaih_addrtuple)); | |
148 | r_tuple_prev = r_tuple; | |
149 | } | |
4e8c8252 LP |
150 | |
151 | /* Verify the size matches */ | |
152 | assert(idx == ms); | |
153 | ||
d2f1f23a ED |
154 | /* Nscd expects us to store the first record in **pat. */ |
155 | if (*pat) | |
156 | **pat = *r_tuple_prev; | |
157 | else | |
158 | *pat = r_tuple_prev; | |
4e8c8252 LP |
159 | |
160 | if (ttlp) | |
161 | *ttlp = 0; | |
162 | ||
06202b9e YW |
163 | /* Explicitly reset both *h_errnop and h_errno to work around |
164 | * https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */ | |
e70df46b LP |
165 | *h_errnop = NETDB_SUCCESS; |
166 | h_errno = 0; | |
167 | ||
4e8c8252 | 168 | return NSS_STATUS_SUCCESS; |
e09e7ac3 LP |
169 | |
170 | not_found: | |
171 | *h_errnop = HOST_NOT_FOUND; | |
172 | return NSS_STATUS_NOTFOUND; | |
4e8c8252 | 173 | } |
6b21f0cf LP |
174 | |
175 | static enum nss_status fill_in_hostent( | |
e8a7a315 | 176 | const char *canonical, const char *additional, |
4e8c8252 | 177 | int af, |
e80af1bd | 178 | struct local_address *addresses, unsigned n_addresses, |
e8a7a315 | 179 | uint32_t local_address_ipv4, |
4e8c8252 LP |
180 | struct hostent *result, |
181 | char *buffer, size_t buflen, | |
0192cbdb | 182 | int *errnop, int *h_errnop, |
4e8c8252 LP |
183 | int32_t *ttlp, |
184 | char **canonp) { | |
185 | ||
d4c9895d | 186 | size_t l_canonical, l_additional, idx, ms, alen; |
e8a7a315 | 187 | char *r_addr, *r_name, *r_aliases, *r_alias = NULL, *r_addr_list; |
e80af1bd | 188 | struct local_address *a; |
e8a7a315 | 189 | unsigned n, c; |
8041b5ba | 190 | |
5502f0d9 LP |
191 | assert(canonical); |
192 | assert(result); | |
193 | assert(buffer); | |
194 | assert(errnop); | |
195 | assert(h_errnop); | |
196 | ||
cdccd29f LP |
197 | PROTECT_ERRNO; |
198 | ||
9d485985 | 199 | alen = FAMILY_ADDRESS_SIZE(af); |
8041b5ba | 200 | |
8041b5ba LP |
201 | for (a = addresses, n = 0, c = 0; n < n_addresses; a++, n++) |
202 | if (af == a->family) | |
203 | c++; | |
4e8c8252 | 204 | |
e8a7a315 | 205 | l_canonical = strlen(canonical); |
7bf7ce28 | 206 | l_additional = strlen_ptr(additional); |
e8a7a315 LP |
207 | ms = ALIGN(l_canonical+1)+ |
208 | (additional ? ALIGN(l_additional+1) : 0) + | |
5502f0d9 | 209 | sizeof(char*) + |
e8a7a315 | 210 | (additional ? sizeof(char*) : 0) + |
d4c9895d | 211 | (c > 0 ? c : 1) * ALIGN(alen) + |
5502f0d9 | 212 | (c > 0 ? c+1 : 2) * sizeof(char*); |
8041b5ba | 213 | |
4e8c8252 | 214 | if (buflen < ms) { |
cdccd29f | 215 | UNPROTECT_ERRNO; |
0192cbdb | 216 | *errnop = ERANGE; |
cda458a5 | 217 | *h_errnop = NETDB_INTERNAL; |
4e8c8252 LP |
218 | return NSS_STATUS_TRYAGAIN; |
219 | } | |
220 | ||
e8a7a315 | 221 | /* First, fill in hostnames */ |
4e8c8252 | 222 | r_name = buffer; |
e8a7a315 LP |
223 | memcpy(r_name, canonical, l_canonical+1); |
224 | idx = ALIGN(l_canonical+1); | |
4e8c8252 | 225 | |
e8a7a315 LP |
226 | if (additional) { |
227 | r_alias = buffer + idx; | |
228 | memcpy(r_alias, additional, l_additional+1); | |
229 | idx += ALIGN(l_additional+1); | |
230 | } | |
231 | ||
232 | /* Second, create aliases array */ | |
4e8c8252 | 233 | r_aliases = buffer + idx; |
e8a7a315 LP |
234 | if (additional) { |
235 | ((char**) r_aliases)[0] = r_alias; | |
236 | ((char**) r_aliases)[1] = NULL; | |
237 | idx += 2*sizeof(char*); | |
238 | } else { | |
239 | ((char**) r_aliases)[0] = NULL; | |
240 | idx += sizeof(char*); | |
241 | } | |
4e8c8252 | 242 | |
8041b5ba | 243 | /* Third, add addresses */ |
4e8c8252 | 244 | r_addr = buffer + idx; |
8041b5ba LP |
245 | if (c > 0) { |
246 | unsigned i = 0; | |
247 | ||
248 | for (a = addresses, n = 0; n < n_addresses; a++, n++) { | |
249 | if (af != a->family) | |
250 | continue; | |
251 | ||
5502f0d9 | 252 | memcpy(r_addr + i*ALIGN(alen), &a->address, alen); |
8041b5ba LP |
253 | i++; |
254 | } | |
255 | ||
256 | assert(i == c); | |
257 | idx += c*ALIGN(alen); | |
258 | } else { | |
259 | if (af == AF_INET) | |
e8a7a315 | 260 | *(uint32_t*) r_addr = local_address_ipv4; |
8041b5ba LP |
261 | else |
262 | memcpy(r_addr, LOCALADDRESS_IPV6, 16); | |
263 | ||
264 | idx += ALIGN(alen); | |
265 | } | |
4e8c8252 LP |
266 | |
267 | /* Fourth, add address pointer array */ | |
268 | r_addr_list = buffer + idx; | |
8041b5ba | 269 | if (c > 0) { |
d4c9895d | 270 | unsigned i; |
8041b5ba | 271 | |
d4c9895d LP |
272 | for (i = 0; i < c; i++) |
273 | ((char**) r_addr_list)[i] = r_addr + i*ALIGN(alen); | |
8041b5ba | 274 | |
d4c9895d LP |
275 | ((char**) r_addr_list)[i] = NULL; |
276 | idx += (c+1) * sizeof(char*); | |
8041b5ba LP |
277 | |
278 | } else { | |
279 | ((char**) r_addr_list)[0] = r_addr; | |
280 | ((char**) r_addr_list)[1] = NULL; | |
d4c9895d | 281 | idx += 2 * sizeof(char*); |
8041b5ba | 282 | } |
4e8c8252 LP |
283 | |
284 | /* Verify the size matches */ | |
285 | assert(idx == ms); | |
286 | ||
287 | result->h_name = r_name; | |
288 | result->h_aliases = (char**) r_aliases; | |
289 | result->h_addrtype = af; | |
290 | result->h_length = alen; | |
291 | result->h_addr_list = (char**) r_addr_list; | |
292 | ||
293 | if (ttlp) | |
294 | *ttlp = 0; | |
295 | ||
296 | if (canonp) | |
297 | *canonp = r_name; | |
298 | ||
06202b9e YW |
299 | /* Explicitly reset both *h_errnop and h_errno to work around |
300 | * https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */ | |
e70df46b LP |
301 | *h_errnop = NETDB_SUCCESS; |
302 | h_errno = 0; | |
303 | ||
4e8c8252 | 304 | return NSS_STATUS_SUCCESS; |
6b21f0cf LP |
305 | } |
306 | ||
4e8c8252 LP |
307 | enum nss_status _nss_myhostname_gethostbyname3_r( |
308 | const char *name, | |
309 | int af, | |
310 | struct hostent *host, | |
311 | char *buffer, size_t buflen, | |
312 | int *errnop, int *h_errnop, | |
313 | int32_t *ttlp, | |
314 | char **canonp) { | |
6b21f0cf | 315 | |
e80af1bd | 316 | _cleanup_free_ struct local_address *addresses = NULL; |
e8a7a315 | 317 | const char *canonical, *additional = NULL; |
5502f0d9 | 318 | _cleanup_free_ char *hn = NULL; |
e9140aff | 319 | uint32_t local_address_ipv4 = 0; |
e80af1bd | 320 | int n_addresses = 0; |
5502f0d9 | 321 | |
06202b9e | 322 | PROTECT_ERRNO; |
0c5eb056 LP |
323 | BLOCK_SIGNALS(NSS_SIGNALS_BLOCK); |
324 | ||
5502f0d9 LP |
325 | assert(name); |
326 | assert(host); | |
327 | assert(buffer); | |
328 | assert(errnop); | |
329 | assert(h_errnop); | |
6b21f0cf | 330 | |
4e8c8252 LP |
331 | if (af == AF_UNSPEC) |
332 | af = AF_INET; | |
6b21f0cf | 333 | |
ec2ce0c5 | 334 | if (!IN_SET(af, AF_INET, AF_INET6)) { |
cdccd29f | 335 | UNPROTECT_ERRNO; |
0192cbdb | 336 | *errnop = EAFNOSUPPORT; |
4e8c8252 LP |
337 | *h_errnop = NO_DATA; |
338 | return NSS_STATUS_UNAVAIL; | |
339 | } | |
6b21f0cf | 340 | |
5502f0d9 | 341 | if (is_localhost(name)) { |
e8a7a315 | 342 | canonical = "localhost"; |
8e38570e | 343 | local_address_ipv4 = htobe32(INADDR_LOOPBACK); |
e9140aff | 344 | |
46a5e0e7 | 345 | } else if (is_gateway_hostname(name)) { |
e9140aff | 346 | |
1d050e1e | 347 | n_addresses = local_gateways(NULL, 0, af, &addresses); |
e09e7ac3 LP |
348 | if (n_addresses <= 0) |
349 | goto not_found; | |
e9140aff | 350 | |
5248e7e1 | 351 | canonical = "_gateway"; |
e9140aff | 352 | |
a1fdbcbe LP |
353 | } else if (is_outbound_hostname(name)) { |
354 | ||
355 | n_addresses = local_outbounds(NULL, 0, af, &addresses); | |
356 | if (n_addresses <= 0) | |
357 | goto not_found; | |
358 | ||
359 | canonical = "_outbound"; | |
360 | ||
e8a7a315 | 361 | } else { |
5502f0d9 LP |
362 | hn = gethostname_malloc(); |
363 | if (!hn) { | |
cdccd29f | 364 | UNPROTECT_ERRNO; |
0192cbdb | 365 | *errnop = ENOMEM; |
e8a7a315 | 366 | *h_errnop = NO_RECOVERY; |
5502f0d9 | 367 | return NSS_STATUS_TRYAGAIN; |
e8a7a315 | 368 | } |
6b21f0cf | 369 | |
e09e7ac3 LP |
370 | if (!streq(name, hn) && !streq_ptr(startswith(name, hn), ".")) |
371 | goto not_found; | |
e8a7a315 | 372 | |
1d050e1e | 373 | n_addresses = local_addresses(NULL, 0, af, &addresses); |
e80af1bd LP |
374 | if (n_addresses < 0) |
375 | n_addresses = 0; | |
e8a7a315 LP |
376 | |
377 | canonical = hn; | |
378 | additional = n_addresses <= 0 && af == AF_INET6 ? "localhost" : NULL; | |
379 | local_address_ipv4 = LOCALADDRESS_IPV4; | |
4e8c8252 | 380 | } |
6b21f0cf | 381 | |
cdccd29f LP |
382 | UNPROTECT_ERRNO; |
383 | ||
e8a7a315 LP |
384 | return fill_in_hostent( |
385 | canonical, additional, | |
386 | af, | |
387 | addresses, n_addresses, | |
388 | local_address_ipv4, | |
389 | host, | |
390 | buffer, buflen, | |
0192cbdb | 391 | errnop, h_errnop, |
e8a7a315 LP |
392 | ttlp, |
393 | canonp); | |
e09e7ac3 LP |
394 | |
395 | not_found: | |
396 | *h_errnop = HOST_NOT_FOUND; | |
397 | return NSS_STATUS_NOTFOUND; | |
4e8c8252 | 398 | } |
6b21f0cf | 399 | |
4e8c8252 LP |
400 | enum nss_status _nss_myhostname_gethostbyaddr2_r( |
401 | const void* addr, socklen_t len, | |
402 | int af, | |
403 | struct hostent *host, | |
404 | char *buffer, size_t buflen, | |
405 | int *errnop, int *h_errnop, | |
406 | int32_t *ttlp) { | |
6b21f0cf | 407 | |
e8a7a315 | 408 | const char *canonical = NULL, *additional = NULL; |
5502f0d9 | 409 | uint32_t local_address_ipv4 = LOCALADDRESS_IPV4; |
e80af1bd | 410 | _cleanup_free_ struct local_address *addresses = NULL; |
5502f0d9 | 411 | _cleanup_free_ char *hn = NULL; |
e80af1bd LP |
412 | int n_addresses = 0; |
413 | struct local_address *a; | |
3fdcecc8 | 414 | bool additional_from_hostname = false; |
e80af1bd | 415 | unsigned n; |
5502f0d9 | 416 | |
06202b9e | 417 | PROTECT_ERRNO; |
0c5eb056 LP |
418 | BLOCK_SIGNALS(NSS_SIGNALS_BLOCK); |
419 | ||
5502f0d9 LP |
420 | assert(addr); |
421 | assert(host); | |
422 | assert(buffer); | |
423 | assert(errnop); | |
424 | assert(h_errnop); | |
8041b5ba | 425 | |
555bd6e9 | 426 | if (!IN_SET(af, AF_INET, AF_INET6)) { |
cdccd29f | 427 | UNPROTECT_ERRNO; |
0192cbdb | 428 | *errnop = EAFNOSUPPORT; |
555bd6e9 LP |
429 | *h_errnop = NO_DATA; |
430 | return NSS_STATUS_UNAVAIL; | |
431 | } | |
432 | ||
9d485985 | 433 | if (len != FAMILY_ADDRESS_SIZE(af)) { |
cdccd29f | 434 | UNPROTECT_ERRNO; |
0192cbdb | 435 | *errnop = EINVAL; |
8041b5ba LP |
436 | *h_errnop = NO_RECOVERY; |
437 | return NSS_STATUS_UNAVAIL; | |
438 | } | |
6b21f0cf | 439 | |
4e8c8252 | 440 | if (af == AF_INET) { |
8041b5ba LP |
441 | if ((*(uint32_t*) addr) == LOCALADDRESS_IPV4) |
442 | goto found; | |
6b21f0cf | 443 | |
8e38570e | 444 | if ((*(uint32_t*) addr) == htobe32(INADDR_LOOPBACK)) { |
e8a7a315 | 445 | canonical = "localhost"; |
8e38570e | 446 | local_address_ipv4 = htobe32(INADDR_LOOPBACK); |
e8a7a315 LP |
447 | goto found; |
448 | } | |
449 | ||
555bd6e9 LP |
450 | } else { |
451 | assert(af == AF_INET6); | |
8041b5ba | 452 | |
e8a7a315 | 453 | if (memcmp(addr, LOCALADDRESS_IPV6, 16) == 0) { |
3fdcecc8 LP |
454 | canonical = "localhost"; |
455 | additional_from_hostname = true; | |
8041b5ba | 456 | goto found; |
e8a7a315 | 457 | } |
4e8c8252 LP |
458 | } |
459 | ||
1d050e1e | 460 | n_addresses = local_addresses(NULL, 0, AF_UNSPEC, &addresses); |
68a9c7c4 ZJS |
461 | for (a = addresses, n = 0; (int) n < n_addresses; n++, a++) { |
462 | if (af != a->family) | |
463 | continue; | |
8041b5ba | 464 | |
68a9c7c4 ZJS |
465 | if (memcmp(addr, &a->address, FAMILY_ADDRESS_SIZE(af)) == 0) |
466 | goto found; | |
e9140aff LP |
467 | } |
468 | ||
97b11eed | 469 | addresses = mfree(addresses); |
e9140aff | 470 | |
1d050e1e | 471 | n_addresses = local_gateways(NULL, 0, AF_UNSPEC, &addresses); |
68a9c7c4 ZJS |
472 | for (a = addresses, n = 0; (int) n < n_addresses; n++, a++) { |
473 | if (af != a->family) | |
474 | continue; | |
e9140aff | 475 | |
68a9c7c4 | 476 | if (memcmp(addr, &a->address, FAMILY_ADDRESS_SIZE(af)) == 0) { |
5248e7e1 | 477 | canonical = "_gateway"; |
68a9c7c4 | 478 | goto found; |
e9140aff | 479 | } |
8041b5ba LP |
480 | } |
481 | ||
8041b5ba | 482 | *h_errnop = HOST_NOT_FOUND; |
8041b5ba LP |
483 | return NSS_STATUS_NOTFOUND; |
484 | ||
485 | found: | |
82e4c2d6 | 486 | if (!canonical || additional_from_hostname) { |
3fdcecc8 LP |
487 | hn = gethostname_malloc(); |
488 | if (!hn) { | |
cdccd29f | 489 | UNPROTECT_ERRNO; |
0192cbdb | 490 | *errnop = ENOMEM; |
3fdcecc8 LP |
491 | *h_errnop = NO_RECOVERY; |
492 | return NSS_STATUS_TRYAGAIN; | |
493 | } | |
494 | ||
495 | if (!canonical) | |
496 | canonical = hn; | |
82e4c2d6 | 497 | else |
3fdcecc8 LP |
498 | additional = hn; |
499 | } | |
4e8c8252 | 500 | |
cdccd29f | 501 | UNPROTECT_ERRNO; |
e8a7a315 LP |
502 | return fill_in_hostent( |
503 | canonical, additional, | |
504 | af, | |
505 | addresses, n_addresses, | |
506 | local_address_ipv4, | |
507 | host, | |
508 | buffer, buflen, | |
0192cbdb | 509 | errnop, h_errnop, |
e8a7a315 LP |
510 | ttlp, |
511 | NULL); | |
4e8c8252 | 512 | } |
6b21f0cf | 513 | |
c9fdc26e LP |
514 | NSS_GETHOSTBYNAME_FALLBACKS(myhostname); |
515 | NSS_GETHOSTBYADDR_FALLBACKS(myhostname); |