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8041b5ba | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
4e8c8252 | 2 | |
4e8c8252 | 3 | /*** |
cbc06dcd | 4 | This file is part of systemd. |
4e8c8252 | 5 | |
8041b5ba | 6 | Copyright 2008-2011 Lennart Poettering |
4e8c8252 | 7 | |
cbc06dcd TG |
8 | systemd is free software; you can redistribute it and/or modify it |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
4e8c8252 | 12 | |
cbc06dcd TG |
13 | systemd is distributed in the hope that it will be useful, but |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
8041b5ba LP |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | Lesser General Public License for more details. | |
4e8c8252 | 17 | |
cbc06dcd TG |
18 | You should have received a copy of the GNU Lesser General Public License |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
4e8c8252 | 20 | ***/ |
6b21f0cf | 21 | |
6b21f0cf | 22 | #include <nss.h> |
6b21f0cf LP |
23 | #include <netdb.h> |
24 | #include <errno.h> | |
25 | #include <string.h> | |
4e8c8252 | 26 | #include <net/if.h> |
8041b5ba | 27 | #include <stdlib.h> |
8041b5ba | 28 | |
e80af1bd | 29 | #include "local-addresses.h" |
1c633045 | 30 | #include "macro.h" |
c9fdc26e | 31 | #include "nss-util.h" |
958b66ea | 32 | #include "hostname-util.h" |
c9fdc26e | 33 | #include "util.h" |
4e8c8252 LP |
34 | |
35 | /* We use 127.0.0.2 as IPv4 address. This has the advantage over | |
36 | * 127.0.0.1 that it can be translated back to the local hostname. For | |
37 | * IPv6 we use ::1 which unfortunately will not translate back to the | |
3fdcecc8 | 38 | * hostname but instead something like "localhost" or so. */ |
4e8c8252 LP |
39 | |
40 | #define LOCALADDRESS_IPV4 (htonl(0x7F000002)) | |
41 | #define LOCALADDRESS_IPV6 &in6addr_loopback | |
4e8c8252 | 42 | |
c9fdc26e LP |
43 | NSS_GETHOSTBYNAME_PROTOTYPES(myhostname); |
44 | NSS_GETHOSTBYADDR_PROTOTYPES(myhostname); | |
8041b5ba | 45 | |
b7d13193 LP |
46 | static bool is_gateway(const char *hostname) { |
47 | assert(hostname); | |
48 | ||
49 | return streq(hostname, "gateway") || | |
50 | streq(hostname, "gateway."); | |
51 | } | |
52 | ||
4e8c8252 LP |
53 | enum nss_status _nss_myhostname_gethostbyname4_r( |
54 | const char *name, | |
55 | struct gaih_addrtuple **pat, | |
56 | char *buffer, size_t buflen, | |
57 | int *errnop, int *h_errnop, | |
58 | int32_t *ttlp) { | |
59 | ||
8041b5ba | 60 | struct gaih_addrtuple *r_tuple, *r_tuple_prev = NULL; |
e80af1bd | 61 | _cleanup_free_ struct local_address *addresses = NULL; |
5502f0d9 LP |
62 | _cleanup_free_ char *hn = NULL; |
63 | const char *canonical = NULL; | |
e80af1bd | 64 | int n_addresses = 0, lo_ifi; |
e8a7a315 | 65 | uint32_t local_address_ipv4; |
e80af1bd | 66 | struct local_address *a; |
5502f0d9 LP |
67 | size_t l, idx, ms; |
68 | char *r_name; | |
e80af1bd | 69 | unsigned n; |
4e8c8252 | 70 | |
5502f0d9 LP |
71 | assert(name); |
72 | assert(pat); | |
73 | assert(buffer); | |
74 | assert(errnop); | |
75 | assert(h_errnop); | |
76 | ||
77 | if (is_localhost(name)) { | |
e8a7a315 LP |
78 | /* We respond to 'localhost', so that /etc/hosts |
79 | * is optional */ | |
4e8c8252 | 80 | |
e8a7a315 LP |
81 | canonical = "localhost"; |
82 | local_address_ipv4 = htonl(INADDR_LOOPBACK); | |
e9140aff | 83 | |
b7d13193 | 84 | } else if (is_gateway(name)) { |
e9140aff | 85 | |
1d050e1e | 86 | n_addresses = local_gateways(NULL, 0, AF_UNSPEC, &addresses); |
e9140aff LP |
87 | if (n_addresses <= 0) { |
88 | *errnop = ENOENT; | |
89 | *h_errnop = HOST_NOT_FOUND; | |
90 | return NSS_STATUS_NOTFOUND; | |
91 | } | |
92 | ||
93 | canonical = "gateway"; | |
94 | ||
e8a7a315 | 95 | } else { |
5502f0d9 LP |
96 | hn = gethostname_malloc(); |
97 | if (!hn) { | |
98 | *errnop = ENOMEM; | |
e8a7a315 | 99 | *h_errnop = NO_RECOVERY; |
5502f0d9 | 100 | return NSS_STATUS_TRYAGAIN; |
e8a7a315 LP |
101 | } |
102 | ||
5502f0d9 LP |
103 | /* We respond to our local host name, our our hostname suffixed with a single dot. */ |
104 | if (!streq(name, hn) && !streq_ptr(startswith(name, hn), ".")) { | |
e8a7a315 LP |
105 | *errnop = ENOENT; |
106 | *h_errnop = HOST_NOT_FOUND; | |
107 | return NSS_STATUS_NOTFOUND; | |
108 | } | |
109 | ||
1d050e1e | 110 | n_addresses = local_addresses(NULL, 0, AF_UNSPEC, &addresses); |
e80af1bd LP |
111 | if (n_addresses < 0) |
112 | n_addresses = 0; | |
e8a7a315 LP |
113 | |
114 | canonical = hn; | |
115 | local_address_ipv4 = LOCALADDRESS_IPV4; | |
116 | } | |
8041b5ba | 117 | |
4e8c8252 | 118 | /* If this call fails we fill in 0 as scope. Which is fine */ |
f4324288 | 119 | lo_ifi = n_addresses <= 0 ? LOOPBACK_IFINDEX : 0; |
4e8c8252 | 120 | |
e8a7a315 | 121 | l = strlen(canonical); |
5502f0d9 | 122 | ms = ALIGN(l+1) + ALIGN(sizeof(struct gaih_addrtuple)) * (n_addresses > 0 ? n_addresses : 2); |
4e8c8252 LP |
123 | if (buflen < ms) { |
124 | *errnop = ENOMEM; | |
125 | *h_errnop = NO_RECOVERY; | |
126 | return NSS_STATUS_TRYAGAIN; | |
127 | } | |
128 | ||
129 | /* First, fill in hostname */ | |
130 | r_name = buffer; | |
e8a7a315 | 131 | memcpy(r_name, canonical, l+1); |
4e8c8252 LP |
132 | idx = ALIGN(l+1); |
133 | ||
8041b5ba LP |
134 | if (n_addresses <= 0) { |
135 | /* Second, fill in IPv6 tuple */ | |
136 | r_tuple = (struct gaih_addrtuple*) (buffer + idx); | |
137 | r_tuple->next = r_tuple_prev; | |
138 | r_tuple->name = r_name; | |
139 | r_tuple->family = AF_INET6; | |
140 | memcpy(r_tuple->addr, LOCALADDRESS_IPV6, 16); | |
141 | r_tuple->scopeid = (uint32_t) lo_ifi; | |
142 | ||
143 | idx += ALIGN(sizeof(struct gaih_addrtuple)); | |
144 | r_tuple_prev = r_tuple; | |
145 | ||
146 | /* Third, fill in IPv4 tuple */ | |
147 | r_tuple = (struct gaih_addrtuple*) (buffer + idx); | |
148 | r_tuple->next = r_tuple_prev; | |
149 | r_tuple->name = r_name; | |
150 | r_tuple->family = AF_INET; | |
e8a7a315 | 151 | *(uint32_t*) r_tuple->addr = local_address_ipv4; |
8041b5ba LP |
152 | r_tuple->scopeid = (uint32_t) lo_ifi; |
153 | ||
154 | idx += ALIGN(sizeof(struct gaih_addrtuple)); | |
155 | r_tuple_prev = r_tuple; | |
156 | } | |
157 | ||
158 | /* Fourth, fill actual addresses in, but in backwards order */ | |
e80af1bd | 159 | for (a = addresses + n_addresses - 1, n = 0; (int) n < n_addresses; n++, a--) { |
8041b5ba LP |
160 | r_tuple = (struct gaih_addrtuple*) (buffer + idx); |
161 | r_tuple->next = r_tuple_prev; | |
162 | r_tuple->name = r_name; | |
163 | r_tuple->family = a->family; | |
164 | r_tuple->scopeid = a->ifindex; | |
5502f0d9 | 165 | memcpy(r_tuple->addr, &a->address, 16); |
8041b5ba LP |
166 | |
167 | idx += ALIGN(sizeof(struct gaih_addrtuple)); | |
168 | r_tuple_prev = r_tuple; | |
169 | } | |
4e8c8252 LP |
170 | |
171 | /* Verify the size matches */ | |
172 | assert(idx == ms); | |
173 | ||
d2f1f23a ED |
174 | /* Nscd expects us to store the first record in **pat. */ |
175 | if (*pat) | |
176 | **pat = *r_tuple_prev; | |
177 | else | |
178 | *pat = r_tuple_prev; | |
4e8c8252 LP |
179 | |
180 | if (ttlp) | |
181 | *ttlp = 0; | |
182 | ||
e70df46b LP |
183 | /* Explicitly reset all error variables */ |
184 | *errnop = 0; | |
185 | *h_errnop = NETDB_SUCCESS; | |
186 | h_errno = 0; | |
187 | ||
4e8c8252 LP |
188 | return NSS_STATUS_SUCCESS; |
189 | } | |
6b21f0cf LP |
190 | |
191 | static enum nss_status fill_in_hostent( | |
e8a7a315 | 192 | const char *canonical, const char *additional, |
4e8c8252 | 193 | int af, |
e80af1bd | 194 | struct local_address *addresses, unsigned n_addresses, |
e8a7a315 | 195 | uint32_t local_address_ipv4, |
4e8c8252 LP |
196 | struct hostent *result, |
197 | char *buffer, size_t buflen, | |
198 | int *errnop, int *h_errnop, | |
199 | int32_t *ttlp, | |
200 | char **canonp) { | |
201 | ||
d4c9895d | 202 | size_t l_canonical, l_additional, idx, ms, alen; |
e8a7a315 | 203 | char *r_addr, *r_name, *r_aliases, *r_alias = NULL, *r_addr_list; |
e80af1bd | 204 | struct local_address *a; |
e8a7a315 | 205 | unsigned n, c; |
8041b5ba | 206 | |
5502f0d9 LP |
207 | assert(canonical); |
208 | assert(result); | |
209 | assert(buffer); | |
210 | assert(errnop); | |
211 | assert(h_errnop); | |
212 | ||
9d485985 | 213 | alen = FAMILY_ADDRESS_SIZE(af); |
8041b5ba | 214 | |
8041b5ba LP |
215 | for (a = addresses, n = 0, c = 0; n < n_addresses; a++, n++) |
216 | if (af == a->family) | |
217 | c++; | |
4e8c8252 | 218 | |
e8a7a315 LP |
219 | l_canonical = strlen(canonical); |
220 | l_additional = additional ? strlen(additional) : 0; | |
221 | ms = ALIGN(l_canonical+1)+ | |
222 | (additional ? ALIGN(l_additional+1) : 0) + | |
5502f0d9 | 223 | sizeof(char*) + |
e8a7a315 | 224 | (additional ? sizeof(char*) : 0) + |
d4c9895d | 225 | (c > 0 ? c : 1) * ALIGN(alen) + |
5502f0d9 | 226 | (c > 0 ? c+1 : 2) * sizeof(char*); |
8041b5ba | 227 | |
4e8c8252 LP |
228 | if (buflen < ms) { |
229 | *errnop = ENOMEM; | |
230 | *h_errnop = NO_RECOVERY; | |
231 | return NSS_STATUS_TRYAGAIN; | |
232 | } | |
233 | ||
e8a7a315 | 234 | /* First, fill in hostnames */ |
4e8c8252 | 235 | r_name = buffer; |
e8a7a315 LP |
236 | memcpy(r_name, canonical, l_canonical+1); |
237 | idx = ALIGN(l_canonical+1); | |
4e8c8252 | 238 | |
e8a7a315 LP |
239 | if (additional) { |
240 | r_alias = buffer + idx; | |
241 | memcpy(r_alias, additional, l_additional+1); | |
242 | idx += ALIGN(l_additional+1); | |
243 | } | |
244 | ||
245 | /* Second, create aliases array */ | |
4e8c8252 | 246 | r_aliases = buffer + idx; |
e8a7a315 LP |
247 | if (additional) { |
248 | ((char**) r_aliases)[0] = r_alias; | |
249 | ((char**) r_aliases)[1] = NULL; | |
250 | idx += 2*sizeof(char*); | |
251 | } else { | |
252 | ((char**) r_aliases)[0] = NULL; | |
253 | idx += sizeof(char*); | |
254 | } | |
4e8c8252 | 255 | |
8041b5ba | 256 | /* Third, add addresses */ |
4e8c8252 | 257 | r_addr = buffer + idx; |
8041b5ba LP |
258 | if (c > 0) { |
259 | unsigned i = 0; | |
260 | ||
261 | for (a = addresses, n = 0; n < n_addresses; a++, n++) { | |
262 | if (af != a->family) | |
263 | continue; | |
264 | ||
5502f0d9 | 265 | memcpy(r_addr + i*ALIGN(alen), &a->address, alen); |
8041b5ba LP |
266 | i++; |
267 | } | |
268 | ||
269 | assert(i == c); | |
270 | idx += c*ALIGN(alen); | |
271 | } else { | |
272 | if (af == AF_INET) | |
e8a7a315 | 273 | *(uint32_t*) r_addr = local_address_ipv4; |
8041b5ba LP |
274 | else |
275 | memcpy(r_addr, LOCALADDRESS_IPV6, 16); | |
276 | ||
277 | idx += ALIGN(alen); | |
278 | } | |
4e8c8252 LP |
279 | |
280 | /* Fourth, add address pointer array */ | |
281 | r_addr_list = buffer + idx; | |
8041b5ba | 282 | if (c > 0) { |
d4c9895d | 283 | unsigned i; |
8041b5ba | 284 | |
d4c9895d LP |
285 | for (i = 0; i < c; i++) |
286 | ((char**) r_addr_list)[i] = r_addr + i*ALIGN(alen); | |
8041b5ba | 287 | |
d4c9895d LP |
288 | ((char**) r_addr_list)[i] = NULL; |
289 | idx += (c+1) * sizeof(char*); | |
8041b5ba LP |
290 | |
291 | } else { | |
292 | ((char**) r_addr_list)[0] = r_addr; | |
293 | ((char**) r_addr_list)[1] = NULL; | |
d4c9895d | 294 | idx += 2 * sizeof(char*); |
8041b5ba | 295 | } |
4e8c8252 LP |
296 | |
297 | /* Verify the size matches */ | |
298 | assert(idx == ms); | |
299 | ||
300 | result->h_name = r_name; | |
301 | result->h_aliases = (char**) r_aliases; | |
302 | result->h_addrtype = af; | |
303 | result->h_length = alen; | |
304 | result->h_addr_list = (char**) r_addr_list; | |
305 | ||
306 | if (ttlp) | |
307 | *ttlp = 0; | |
308 | ||
309 | if (canonp) | |
310 | *canonp = r_name; | |
311 | ||
e70df46b LP |
312 | /* Explicitly reset all error variables */ |
313 | *errnop = 0; | |
314 | *h_errnop = NETDB_SUCCESS; | |
315 | h_errno = 0; | |
316 | ||
4e8c8252 | 317 | return NSS_STATUS_SUCCESS; |
6b21f0cf LP |
318 | } |
319 | ||
4e8c8252 LP |
320 | enum nss_status _nss_myhostname_gethostbyname3_r( |
321 | const char *name, | |
322 | int af, | |
323 | struct hostent *host, | |
324 | char *buffer, size_t buflen, | |
325 | int *errnop, int *h_errnop, | |
326 | int32_t *ttlp, | |
327 | char **canonp) { | |
6b21f0cf | 328 | |
e80af1bd | 329 | _cleanup_free_ struct local_address *addresses = NULL; |
e8a7a315 | 330 | const char *canonical, *additional = NULL; |
5502f0d9 | 331 | _cleanup_free_ char *hn = NULL; |
e9140aff | 332 | uint32_t local_address_ipv4 = 0; |
e80af1bd | 333 | int n_addresses = 0; |
5502f0d9 LP |
334 | |
335 | assert(name); | |
336 | assert(host); | |
337 | assert(buffer); | |
338 | assert(errnop); | |
339 | assert(h_errnop); | |
6b21f0cf | 340 | |
4e8c8252 LP |
341 | if (af == AF_UNSPEC) |
342 | af = AF_INET; | |
6b21f0cf | 343 | |
4e8c8252 LP |
344 | if (af != AF_INET && af != AF_INET6) { |
345 | *errnop = EAFNOSUPPORT; | |
346 | *h_errnop = NO_DATA; | |
347 | return NSS_STATUS_UNAVAIL; | |
348 | } | |
6b21f0cf | 349 | |
5502f0d9 | 350 | if (is_localhost(name)) { |
e8a7a315 LP |
351 | canonical = "localhost"; |
352 | local_address_ipv4 = htonl(INADDR_LOOPBACK); | |
e9140aff | 353 | |
b7d13193 | 354 | } else if (is_gateway(name)) { |
e9140aff | 355 | |
1d050e1e | 356 | n_addresses = local_gateways(NULL, 0, af, &addresses); |
e9140aff LP |
357 | if (n_addresses <= 0) { |
358 | *errnop = ENOENT; | |
359 | *h_errnop = HOST_NOT_FOUND; | |
360 | return NSS_STATUS_NOTFOUND; | |
361 | } | |
362 | ||
363 | canonical = "gateway"; | |
364 | ||
e8a7a315 | 365 | } else { |
5502f0d9 LP |
366 | hn = gethostname_malloc(); |
367 | if (!hn) { | |
368 | *errnop = ENOMEM; | |
e8a7a315 | 369 | *h_errnop = NO_RECOVERY; |
5502f0d9 | 370 | return NSS_STATUS_TRYAGAIN; |
e8a7a315 | 371 | } |
6b21f0cf | 372 | |
5502f0d9 | 373 | if (!streq(name, hn) && !streq_ptr(startswith(name, hn), ".")) { |
e8a7a315 LP |
374 | *errnop = ENOENT; |
375 | *h_errnop = HOST_NOT_FOUND; | |
376 | return NSS_STATUS_NOTFOUND; | |
377 | } | |
378 | ||
1d050e1e | 379 | n_addresses = local_addresses(NULL, 0, af, &addresses); |
e80af1bd LP |
380 | if (n_addresses < 0) |
381 | n_addresses = 0; | |
e8a7a315 LP |
382 | |
383 | canonical = hn; | |
384 | additional = n_addresses <= 0 && af == AF_INET6 ? "localhost" : NULL; | |
385 | local_address_ipv4 = LOCALADDRESS_IPV4; | |
4e8c8252 | 386 | } |
6b21f0cf | 387 | |
e8a7a315 LP |
388 | return fill_in_hostent( |
389 | canonical, additional, | |
390 | af, | |
391 | addresses, n_addresses, | |
392 | local_address_ipv4, | |
393 | host, | |
394 | buffer, buflen, | |
395 | errnop, h_errnop, | |
396 | ttlp, | |
397 | canonp); | |
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 LP |
416 | |
417 | assert(addr); | |
418 | assert(host); | |
419 | assert(buffer); | |
420 | assert(errnop); | |
421 | assert(h_errnop); | |
8041b5ba | 422 | |
555bd6e9 LP |
423 | if (!IN_SET(af, AF_INET, AF_INET6)) { |
424 | *errnop = EAFNOSUPPORT; | |
425 | *h_errnop = NO_DATA; | |
426 | return NSS_STATUS_UNAVAIL; | |
427 | } | |
428 | ||
9d485985 | 429 | if (len != FAMILY_ADDRESS_SIZE(af)) { |
8041b5ba LP |
430 | *errnop = EINVAL; |
431 | *h_errnop = NO_RECOVERY; | |
432 | return NSS_STATUS_UNAVAIL; | |
433 | } | |
6b21f0cf | 434 | |
4e8c8252 | 435 | if (af == AF_INET) { |
8041b5ba LP |
436 | if ((*(uint32_t*) addr) == LOCALADDRESS_IPV4) |
437 | goto found; | |
6b21f0cf | 438 | |
e8a7a315 LP |
439 | if ((*(uint32_t*) addr) == htonl(INADDR_LOOPBACK)) { |
440 | canonical = "localhost"; | |
441 | local_address_ipv4 = htonl(INADDR_LOOPBACK); | |
442 | goto found; | |
443 | } | |
444 | ||
555bd6e9 LP |
445 | } else { |
446 | assert(af == AF_INET6); | |
8041b5ba | 447 | |
e8a7a315 | 448 | if (memcmp(addr, LOCALADDRESS_IPV6, 16) == 0) { |
3fdcecc8 LP |
449 | canonical = "localhost"; |
450 | additional_from_hostname = true; | |
8041b5ba | 451 | goto found; |
e8a7a315 | 452 | } |
4e8c8252 LP |
453 | } |
454 | ||
1d050e1e | 455 | n_addresses = local_addresses(NULL, 0, AF_UNSPEC, &addresses); |
e9140aff LP |
456 | if (n_addresses > 0) { |
457 | for (a = addresses, n = 0; (int) n < n_addresses; n++, a++) { | |
458 | if (af != a->family) | |
459 | continue; | |
8041b5ba | 460 | |
3fdcecc8 | 461 | if (memcmp(addr, &a->address, FAMILY_ADDRESS_SIZE(af)) == 0) |
e9140aff | 462 | goto found; |
e9140aff LP |
463 | } |
464 | } | |
465 | ||
97b11eed | 466 | addresses = mfree(addresses); |
e9140aff | 467 | |
1d050e1e | 468 | n_addresses = local_gateways(NULL, 0, AF_UNSPEC, &addresses); |
e9140aff LP |
469 | if (n_addresses > 0) { |
470 | for (a = addresses, n = 0; (int) n < n_addresses; n++, a++) { | |
471 | if (af != a->family) | |
472 | continue; | |
473 | ||
474 | if (memcmp(addr, &a->address, FAMILY_ADDRESS_SIZE(af)) == 0) { | |
e9140aff LP |
475 | canonical = "gateway"; |
476 | goto found; | |
477 | } | |
478 | } | |
8041b5ba LP |
479 | } |
480 | ||
481 | *errnop = ENOENT; | |
482 | *h_errnop = HOST_NOT_FOUND; | |
483 | ||
8041b5ba LP |
484 | return NSS_STATUS_NOTFOUND; |
485 | ||
486 | found: | |
3fdcecc8 LP |
487 | if (!canonical || (!additional && additional_from_hostname)) { |
488 | hn = gethostname_malloc(); | |
489 | if (!hn) { | |
490 | *errnop = ENOMEM; | |
491 | *h_errnop = NO_RECOVERY; | |
492 | return NSS_STATUS_TRYAGAIN; | |
493 | } | |
494 | ||
495 | if (!canonical) | |
496 | canonical = hn; | |
497 | ||
498 | if (!additional && additional_from_hostname) | |
499 | additional = hn; | |
500 | } | |
4e8c8252 | 501 | |
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, | |
509 | errnop, h_errnop, | |
510 | ttlp, | |
511 | NULL); | |
4e8c8252 | 512 | } |
6b21f0cf | 513 | |
c9fdc26e LP |
514 | NSS_GETHOSTBYNAME_FALLBACKS(myhostname); |
515 | NSS_GETHOSTBYADDR_FALLBACKS(myhostname); |