1 /* Copyright (C) 1996-2000, 2002, 2003, 2006, 2007, 2008
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 /* The following is an ugly trick to avoid a prototype declaration for
26 #define _nss_nis_endhostent _nss_nis_endhostent_XXX
28 #undef _nss_nis_endhostent
30 #include <netinet/in.h>
31 #include <arpa/inet.h>
33 #include <bits/libc-lock.h>
34 #include <rpcsvc/yp.h>
35 #include <rpcsvc/ypclnt.h>
39 /* Get implementation for some internal functions. */
40 #include <resolv/mapv4v6addr.h>
42 #define ENTNAME hostent
43 #define DATABASE "hosts"
46 #define EXTRA_ARGS , af, flags
47 #define EXTRA_ARGS_DECL , int af, int flags
49 #define ENTDATA hostent_data
52 unsigned char host_addr
[16]; /* IPv4 or IPv6 address. */
53 char *h_addr_ptrs
[2]; /* Points to that and null terminator. */
56 #define TRAILING_LIST_MEMBER h_aliases
57 #define TRAILING_LIST_SEPARATOR_P isspace
58 #include <nss/nss_files/files-parse.c>
64 STRING_FIELD (addr
, isspace
, 1);
66 assert (af
== AF_INET
|| af
== AF_INET6
|| af
== AF_UNSPEC
);
69 if (af
!= AF_INET6
&& inet_pton (AF_INET
, addr
, entdata
->host_addr
) > 0)
71 assert ((flags
& AI_V4MAPPED
) == 0 || af
!= AF_UNSPEC
);
72 if (flags
& AI_V4MAPPED
)
74 map_v4v6_address ((char *) entdata
->host_addr
,
75 (char *) entdata
->host_addr
);
76 result
->h_addrtype
= AF_INET6
;
77 result
->h_length
= IN6ADDRSZ
;
81 result
->h_addrtype
= AF_INET
;
82 result
->h_length
= INADDRSZ
;
85 else if (af
!= AF_INET
86 && inet_pton (AF_INET6
, addr
, entdata
->host_addr
) > 0)
88 result
->h_addrtype
= AF_INET6
;
89 result
->h_length
= IN6ADDRSZ
;
92 /* Illegal address: ignore line. */
95 /* Store a pointer to the address in the expected form. */
96 entdata
->h_addr_ptrs
[0] = (char *) entdata
->host_addr
;
97 entdata
->h_addr_ptrs
[1] = NULL
;
98 result
->h_addr_list
= entdata
->h_addr_ptrs
;
100 STRING_FIELD (result
->h_name
, isspace
, 1);
104 __libc_lock_define_initialized (static, lock
)
106 static bool_t new_start
= 1;
107 static char *oldkey
= NULL
;
108 static int oldkeylen
= 0;
112 _nss_nis_sethostent (int stayopen
)
114 __libc_lock_lock (lock
);
124 __libc_lock_unlock (lock
);
126 return NSS_STATUS_SUCCESS
;
128 /* Make _nss_nis_endhostent an alias of _nss_nis_sethostent. We do this
129 even though the prototypes don't match. The argument of sethostent
130 is used so this makes no difference. */
131 strong_alias (_nss_nis_sethostent
, _nss_nis_endhostent
)
134 /* The calling function always need to get a lock first. */
135 static enum nss_status
136 internal_nis_gethostent_r (struct hostent
*host
, char *buffer
,
137 size_t buflen
, int *errnop
, int *h_errnop
,
141 if (__builtin_expect (yp_get_default_domain (&domain
), 0))
142 return NSS_STATUS_UNAVAIL
;
144 uintptr_t pad
= -(uintptr_t) buffer
% __alignof__ (struct parser_data
);
147 struct parser_data
*data
= (void *) buffer
;
148 if (__builtin_expect (buflen
< sizeof *data
+ 1 + pad
, 0))
151 *h_errnop
= NETDB_INTERNAL
;
152 return NSS_STATUS_TRYAGAIN
;
156 /* Get the next entry until we found a correct one. */
157 const size_t linebuflen
= buffer
+ buflen
- data
->linebuffer
;
167 yperr
= yp_first (domain
, "hosts.byname", &outkey
, &keylen
, &result
,
170 yperr
= yp_next (domain
, "hosts.byname", oldkey
, oldkeylen
, &outkey
,
171 &keylen
, &result
, &len
);
173 if (__builtin_expect (yperr
!= YPERR_SUCCESS
, 0))
175 enum nss_status retval
= yperr2nss (yperr
);
179 case NSS_STATUS_TRYAGAIN
:
181 *h_errnop
= TRY_AGAIN
;
183 case NSS_STATUS_NOTFOUND
:
184 *h_errnop
= HOST_NOT_FOUND
;
187 *h_errnop
= NO_RECOVERY
;
193 if (__builtin_expect ((size_t) (len
+ 1) > linebuflen
, 0))
196 *h_errnop
= NETDB_INTERNAL
;
198 return NSS_STATUS_TRYAGAIN
;
201 char *p
= strncpy (data
->linebuffer
, result
, len
);
202 data
->linebuffer
[len
] = '\0';
207 parse_res
= parse_line (p
, host
, data
, buflen
, errnop
, af
, flags
);
208 if (__builtin_expect (parse_res
== -1, 0))
211 *h_errnop
= NETDB_INTERNAL
;
213 return NSS_STATUS_TRYAGAIN
;
222 *h_errnop
= NETDB_SUCCESS
;
223 return NSS_STATUS_SUCCESS
;
228 _nss_nis_gethostent_r (struct hostent
*host
, char *buffer
, size_t buflen
,
229 int *errnop
, int *h_errnop
)
231 enum nss_status status
;
233 __libc_lock_lock (lock
);
235 status
= internal_nis_gethostent_r (host
, buffer
, buflen
, errnop
, h_errnop
,
236 ((_res
.options
& RES_USE_INET6
) ? AF_INET6
: AF_INET
),
237 ((_res
.options
& RES_USE_INET6
) ? AI_V4MAPPED
: 0 ));
239 __libc_lock_unlock (lock
);
245 static enum nss_status
246 internal_gethostbyname2_r (const char *name
, int af
, struct hostent
*host
,
247 char *buffer
, size_t buflen
, int *errnop
,
248 int *h_errnop
, int flags
)
250 uintptr_t pad
= -(uintptr_t) buffer
% __alignof__ (struct parser_data
);
253 struct parser_data
*data
= (void *) buffer
;
258 return NSS_STATUS_UNAVAIL
;
262 if (yp_get_default_domain (&domain
))
263 return NSS_STATUS_UNAVAIL
;
265 if (buflen
< sizeof *data
+ 1 + pad
)
267 *h_errnop
= NETDB_INTERNAL
;
269 return NSS_STATUS_TRYAGAIN
;
273 /* Convert name to lowercase. */
274 size_t namlen
= strlen (name
);
275 char name2
[namlen
+ 1];
278 for (i
= 0; i
< namlen
; ++i
)
279 name2
[i
] = tolower (name
[i
]);
284 int yperr
= yp_match (domain
, "hosts.byname", name2
, namlen
, &result
, &len
);
286 if (__builtin_expect (yperr
!= YPERR_SUCCESS
, 0))
288 enum nss_status retval
= yperr2nss (yperr
);
290 if (retval
== NSS_STATUS_TRYAGAIN
)
292 *h_errnop
= TRY_AGAIN
;
295 if (retval
== NSS_STATUS_NOTFOUND
)
296 *h_errnop
= HOST_NOT_FOUND
;
300 const size_t linebuflen
= buffer
+ buflen
- data
->linebuffer
;
301 if (__builtin_expect ((size_t) (len
+ 1) > linebuflen
, 0))
304 *h_errnop
= NETDB_INTERNAL
;
306 return NSS_STATUS_TRYAGAIN
;
309 char *p
= strncpy (data
->linebuffer
, result
, len
);
310 data
->linebuffer
[len
] = '\0';
315 int parse_res
= parse_line (p
, host
, data
, buflen
, errnop
, af
, flags
);
317 if (__builtin_expect (parse_res
< 1 || host
->h_addrtype
!= af
, 0))
321 *h_errnop
= NETDB_INTERNAL
;
322 return NSS_STATUS_TRYAGAIN
;
326 *h_errnop
= HOST_NOT_FOUND
;
327 return NSS_STATUS_NOTFOUND
;
331 *h_errnop
= NETDB_SUCCESS
;
332 return NSS_STATUS_SUCCESS
;
337 _nss_nis_gethostbyname2_r (const char *name
, int af
, struct hostent
*host
,
338 char *buffer
, size_t buflen
, int *errnop
,
341 if (af
!= AF_INET
&& af
!= AF_INET6
)
343 *h_errnop
= HOST_NOT_FOUND
;
344 return NSS_STATUS_NOTFOUND
;
347 return internal_gethostbyname2_r (name
, af
, host
, buffer
, buflen
, errnop
,
349 ((_res
.options
& RES_USE_INET6
) ? AI_V4MAPPED
: 0));
354 _nss_nis_gethostbyname_r (const char *name
, struct hostent
*host
, char *buffer
,
355 size_t buflen
, int *errnop
, int *h_errnop
)
357 if (_res
.options
& RES_USE_INET6
)
359 enum nss_status status
;
361 status
= internal_gethostbyname2_r (name
, AF_INET6
, host
, buffer
, buflen
,
362 errnop
, h_errnop
, AI_V4MAPPED
);
363 if (status
== NSS_STATUS_SUCCESS
)
367 return internal_gethostbyname2_r (name
, AF_INET
, host
, buffer
, buflen
,
368 errnop
, h_errnop
, 0);
373 _nss_nis_gethostbyaddr_r (const void *addr
, socklen_t addrlen
, int af
,
374 struct hostent
*host
, char *buffer
, size_t buflen
,
375 int *errnop
, int *h_errnop
)
378 if (__builtin_expect (yp_get_default_domain (&domain
), 0))
379 return NSS_STATUS_UNAVAIL
;
381 uintptr_t pad
= -(uintptr_t) buffer
% __alignof__ (struct parser_data
);
384 struct parser_data
*data
= (void *) buffer
;
385 if (__builtin_expect (buflen
< sizeof *data
+ 1 + pad
, 0))
388 *h_errnop
= NETDB_INTERNAL
;
389 return NSS_STATUS_TRYAGAIN
;
393 char *buf
= inet_ntoa (*(const struct in_addr
*) addr
);
397 int yperr
= yp_match (domain
, "hosts.byaddr", buf
, strlen (buf
), &result
,
400 if (__builtin_expect (yperr
!= YPERR_SUCCESS
, 0))
402 enum nss_status retval
= yperr2nss (yperr
);
404 if (retval
== NSS_STATUS_TRYAGAIN
)
406 *h_errnop
= TRY_AGAIN
;
409 else if (retval
== NSS_STATUS_NOTFOUND
)
410 *h_errnop
= HOST_NOT_FOUND
;
415 const size_t linebuflen
= buffer
+ buflen
- data
->linebuffer
;
416 if (__builtin_expect ((size_t) (len
+ 1) > linebuflen
, 0))
420 *h_errnop
= NETDB_INTERNAL
;
421 return NSS_STATUS_TRYAGAIN
;
424 char *p
= strncpy (data
->linebuffer
, result
, len
);
425 data
->linebuffer
[len
] = '\0';
430 int parse_res
= parse_line (p
, host
, data
, buflen
, errnop
, af
,
431 ((_res
.options
& RES_USE_INET6
)
433 if (__builtin_expect (parse_res
< 1, 0))
437 *h_errnop
= NETDB_INTERNAL
;
438 return NSS_STATUS_TRYAGAIN
;
442 *h_errnop
= HOST_NOT_FOUND
;
443 return NSS_STATUS_NOTFOUND
;
447 *h_errnop
= NETDB_SUCCESS
;
448 return NSS_STATUS_SUCCESS
;
453 _nss_nis_gethostbyname4_r (const char *name
, struct gaih_addrtuple
**pat
,
454 char *buffer
, size_t buflen
, int *errnop
,
455 int *herrnop
, int32_t *ttlp
)
458 if (yp_get_default_domain (&domain
))
459 return NSS_STATUS_UNAVAIL
;
461 /* Convert name to lowercase. */
462 size_t namlen
= strlen (name
);
463 char name2
[namlen
+ 1];
466 for (i
= 0; i
< namlen
; ++i
)
467 name2
[i
] = tolower (name
[i
]);
472 int yperr
= yp_match (domain
, "hosts.byname", name2
, namlen
, &result
, &len
);
474 if (__builtin_expect (yperr
!= YPERR_SUCCESS
, 0))
476 enum nss_status retval
= yperr2nss (yperr
);
478 if (retval
== NSS_STATUS_TRYAGAIN
)
480 *herrnop
= TRY_AGAIN
;
483 if (retval
== NSS_STATUS_NOTFOUND
)
484 *herrnop
= HOST_NOT_FOUND
;
490 uintptr_t pad
= (-(uintptr_t) buffer
491 % __alignof__ (struct gaih_addrtuple
));
493 buflen
= buflen
> pad
? buflen
- pad
: 0;
495 if (__builtin_expect (buflen
< sizeof (struct gaih_addrtuple
), 0))
500 *herrnop
= NETDB_INTERNAL
;
501 return NSS_STATUS_TRYAGAIN
;
504 *pat
= (struct gaih_addrtuple
*) buffer
;
505 buffer
+= sizeof (struct gaih_addrtuple
);
506 buflen
-= sizeof (struct gaih_addrtuple
);
509 uintptr_t pad
= -(uintptr_t) buffer
% __alignof__ (struct parser_data
);
512 struct parser_data
*data
= (void *) buffer
;
514 if (__builtin_expect (buflen
< sizeof *data
+ 1 + pad
, 0))
519 int parse_res
= parse_line (result
, &host
, data
, buflen
, errnop
, AF_UNSPEC
,
521 if (__builtin_expect (parse_res
< 1, 0))
525 *herrnop
= NETDB_INTERNAL
;
526 return NSS_STATUS_TRYAGAIN
;
530 *herrnop
= HOST_NOT_FOUND
;
531 return NSS_STATUS_NOTFOUND
;
536 (*pat
)->family
= host
.h_addrtype
;
537 memcpy ((*pat
)->addr
, host
.h_addr_list
[0], host
.h_length
);
539 assert (host
.h_addr_list
[1] == NULL
);
541 /* Undo the alignment for parser_data. */
545 size_t h_name_len
= strlen (host
.h_name
) + 1;
546 if (h_name_len
>= buflen
)
548 (*pat
)->name
= memcpy (buffer
, host
.h_name
, h_name_len
);
552 return NSS_STATUS_SUCCESS
;