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32c075e1 | 1 | /* Copyright (C) 1996-2000, 2002, 2003, 2006, 2007 Free Software Foundation, Inc. |
6259ec0d | 2 | This file is part of the GNU C Library. |
1e275b9e | 3 | Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996. |
6259ec0d UD |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
6259ec0d UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
6259ec0d | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
6259ec0d UD |
19 | |
20 | #include <nss.h> | |
21 | #include <ctype.h> | |
6675b191 UD |
22 | /* The following is an ugly trick to avoid a prototype declaration for |
23 | _nss_nis_endgrent. */ | |
24 | #define _nss_nis_endhostent _nss_nis_endhostent_XXX | |
6259ec0d | 25 | #include <netdb.h> |
6675b191 | 26 | #undef _nss_nis_endhostent |
6259ec0d UD |
27 | #include <string.h> |
28 | #include <netinet/in.h> | |
29 | #include <arpa/inet.h> | |
30 | #include <resolv.h> | |
5107cf1d | 31 | #include <bits/libc-lock.h> |
6259ec0d UD |
32 | #include <rpcsvc/yp.h> |
33 | #include <rpcsvc/ypclnt.h> | |
34 | ||
35 | #include "nss-nis.h" | |
36 | ||
37 | /* Get implementation for some internal functions. */ | |
cf29ffbe | 38 | #include <resolv/mapv4v6addr.h> |
6259ec0d UD |
39 | |
40 | #define ENTNAME hostent | |
41 | #define DATABASE "hosts" | |
42 | #define NEED_H_ERRNO | |
43 | ||
1e275b9e UD |
44 | #define EXTRA_ARGS , af, flags |
45 | #define EXTRA_ARGS_DECL , int af, int flags | |
46 | ||
6259ec0d UD |
47 | #define ENTDATA hostent_data |
48 | struct hostent_data | |
49 | { | |
50 | unsigned char host_addr[16]; /* IPv4 or IPv6 address. */ | |
51 | char *h_addr_ptrs[2]; /* Points to that and null terminator. */ | |
52 | }; | |
53 | ||
54 | #define TRAILING_LIST_MEMBER h_aliases | |
55 | #define TRAILING_LIST_SEPARATOR_P isspace | |
cf29ffbe | 56 | #include <nss/nss_files/files-parse.c> |
6259ec0d UD |
57 | LINE_PARSER |
58 | ("#", | |
59 | { | |
60 | char *addr; | |
61 | ||
62 | STRING_FIELD (addr, isspace, 1); | |
63 | ||
64 | /* Parse address. */ | |
1e275b9e UD |
65 | if (af == AF_INET && inet_pton (AF_INET, addr, entdata->host_addr) > 0) |
66 | { | |
67 | if (flags & AI_V4MAPPED) | |
68 | { | |
69 | map_v4v6_address ((char *) entdata->host_addr, | |
70 | (char *) entdata->host_addr); | |
71 | result->h_addrtype = AF_INET6; | |
72 | result->h_length = IN6ADDRSZ; | |
73 | } | |
74 | else | |
75 | { | |
76 | result->h_addrtype = AF_INET; | |
77 | result->h_length = INADDRSZ; | |
78 | } | |
79 | } | |
80 | else if (af == AF_INET6 | |
81 | && inet_pton (AF_INET6, addr, entdata->host_addr) > 0) | |
6259ec0d UD |
82 | { |
83 | result->h_addrtype = AF_INET6; | |
84 | result->h_length = IN6ADDRSZ; | |
85 | } | |
86 | else | |
1e275b9e UD |
87 | /* Illegal address: ignore line. */ |
88 | return 0; | |
6259ec0d UD |
89 | |
90 | /* Store a pointer to the address in the expected form. */ | |
91 | entdata->h_addr_ptrs[0] = entdata->host_addr; | |
92 | entdata->h_addr_ptrs[1] = NULL; | |
93 | result->h_addr_list = entdata->h_addr_ptrs; | |
94 | ||
6259ec0d | 95 | STRING_FIELD (result->h_name, isspace, 1); |
1e275b9e UD |
96 | }) |
97 | ||
6259ec0d UD |
98 | |
99 | __libc_lock_define_initialized (static, lock) | |
100 | ||
101 | static bool_t new_start = 1; | |
102 | static char *oldkey = NULL; | |
103 | static int oldkeylen = 0; | |
104 | ||
105 | enum nss_status | |
51eecc4a | 106 | _nss_nis_sethostent (int stayopen) |
6259ec0d UD |
107 | { |
108 | __libc_lock_lock (lock); | |
109 | ||
110 | new_start = 1; | |
111 | if (oldkey != NULL) | |
112 | { | |
113 | free (oldkey); | |
114 | oldkey = NULL; | |
115 | oldkeylen = 0; | |
116 | } | |
117 | ||
118 | __libc_lock_unlock (lock); | |
119 | ||
120 | return NSS_STATUS_SUCCESS; | |
121 | } | |
6675b191 UD |
122 | /* Make _nss_nis_endhostent an alias of _nss_nis_sethostent. We do this |
123 | even though the prototypes don't match. The argument of sethostent | |
124 | is used so this makes no difference. */ | |
125 | strong_alias (_nss_nis_sethostent, _nss_nis_endhostent) | |
6259ec0d | 126 | |
1e275b9e | 127 | /* The calling function always need to get a lock first. */ |
6259ec0d UD |
128 | static enum nss_status |
129 | internal_nis_gethostent_r (struct hostent *host, char *buffer, | |
1e275b9e UD |
130 | size_t buflen, int *errnop, int *h_errnop, |
131 | int af, int flags) | |
6259ec0d UD |
132 | { |
133 | char *domain; | |
ab9a9ff8 | 134 | if (__builtin_expect (yp_get_default_domain (&domain), 0)) |
a334319f | 135 | return NSS_STATUS_UNAVAIL; |
0ecb606c | 136 | |
32c075e1 JJ |
137 | uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data); |
138 | buffer += pad; | |
139 | ||
ab9a9ff8 | 140 | struct parser_data *data = (void *) buffer; |
32c075e1 | 141 | if (__builtin_expect (buflen < sizeof *data + 1 + pad, 0)) |
6259ec0d | 142 | { |
d71b808a | 143 | *errnop = ERANGE; |
6259ec0d UD |
144 | *h_errnop = NETDB_INTERNAL; |
145 | return NSS_STATUS_TRYAGAIN; | |
146 | } | |
32c075e1 | 147 | buflen -= pad; |
6259ec0d UD |
148 | |
149 | /* Get the next entry until we found a correct one. */ | |
ab9a9ff8 UD |
150 | const size_t linebuflen = buffer + buflen - data->linebuffer; |
151 | int parse_res; | |
6259ec0d UD |
152 | do |
153 | { | |
ab9a9ff8 UD |
154 | char *result; |
155 | int len; | |
156 | char *outkey; | |
157 | int keylen; | |
158 | int yperr; | |
6259ec0d | 159 | if (new_start) |
ab9a9ff8 UD |
160 | yperr = yp_first (domain, "hosts.byname", &outkey, &keylen, &result, |
161 | &len); | |
6259ec0d | 162 | else |
ab9a9ff8 UD |
163 | yperr = yp_next (domain, "hosts.byname", oldkey, oldkeylen, &outkey, |
164 | &keylen, &result, &len); | |
6259ec0d | 165 | |
ab9a9ff8 | 166 | if (__builtin_expect (yperr != YPERR_SUCCESS, 0)) |
6259ec0d | 167 | { |
ab9a9ff8 UD |
168 | enum nss_status retval = yperr2nss (yperr); |
169 | ||
6259ec0d UD |
170 | switch (retval) |
171 | { | |
172 | case NSS_STATUS_TRYAGAIN: | |
d71b808a | 173 | *errnop = errno; |
6259ec0d UD |
174 | *h_errnop = TRY_AGAIN; |
175 | break; | |
176 | case NSS_STATUS_NOTFOUND: | |
177 | *h_errnop = HOST_NOT_FOUND; | |
178 | break; | |
179 | default: | |
180 | *h_errnop = NO_RECOVERY; | |
181 | break; | |
182 | } | |
183 | return retval; | |
184 | } | |
185 | ||
ab9a9ff8 | 186 | if (__builtin_expect ((size_t) (len + 1) > linebuflen, 0)) |
6259ec0d UD |
187 | { |
188 | free (result); | |
189 | *h_errnop = NETDB_INTERNAL; | |
d71b808a | 190 | *errnop = ERANGE; |
6259ec0d UD |
191 | return NSS_STATUS_TRYAGAIN; |
192 | } | |
193 | ||
ab9a9ff8 | 194 | char *p = strncpy (data->linebuffer, result, len); |
6259ec0d UD |
195 | data->linebuffer[len] = '\0'; |
196 | while (isspace (*p)) | |
197 | ++p; | |
198 | free (result); | |
199 | ||
1e275b9e | 200 | parse_res = parse_line (p, host, data, buflen, errnop, af, flags); |
ab9a9ff8 | 201 | if (__builtin_expect (parse_res == -1, 0)) |
6259ec0d | 202 | { |
60c96635 | 203 | free (outkey); |
d71b808a UD |
204 | *h_errnop = NETDB_INTERNAL; |
205 | *errnop = ERANGE; | |
6259ec0d UD |
206 | return NSS_STATUS_TRYAGAIN; |
207 | } | |
208 | free (oldkey); | |
209 | oldkey = outkey; | |
210 | oldkeylen = keylen; | |
211 | new_start = 0; | |
212 | } | |
213 | while (!parse_res); | |
214 | ||
215 | *h_errnop = NETDB_SUCCESS; | |
216 | return NSS_STATUS_SUCCESS; | |
217 | } | |
218 | ||
1e275b9e | 219 | enum nss_status |
6259ec0d | 220 | _nss_nis_gethostent_r (struct hostent *host, char *buffer, size_t buflen, |
d71b808a | 221 | int *errnop, int *h_errnop) |
6259ec0d | 222 | { |
1e275b9e | 223 | enum nss_status status; |
6259ec0d UD |
224 | |
225 | __libc_lock_lock (lock); | |
226 | ||
1e275b9e UD |
227 | status = internal_nis_gethostent_r (host, buffer, buflen, errnop, h_errnop, |
228 | ((_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET), | |
229 | ((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0 )); | |
6259ec0d UD |
230 | |
231 | __libc_lock_unlock (lock); | |
232 | ||
233 | return status; | |
234 | } | |
235 | ||
1e275b9e UD |
236 | static enum nss_status |
237 | internal_gethostbyname2_r (const char *name, int af, struct hostent *host, | |
d71b808a | 238 | char *buffer, size_t buflen, int *errnop, |
1e275b9e | 239 | int *h_errnop, int flags) |
6259ec0d | 240 | { |
32c075e1 JJ |
241 | uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data); |
242 | buffer += pad; | |
243 | ||
6259ec0d | 244 | struct parser_data *data = (void *) buffer; |
6259ec0d UD |
245 | |
246 | if (name == NULL) | |
247 | { | |
ac9f45cf | 248 | *errnop = EINVAL; |
6259ec0d UD |
249 | return NSS_STATUS_UNAVAIL; |
250 | } | |
251 | ||
ab9a9ff8 | 252 | char *domain; |
6259ec0d UD |
253 | if (yp_get_default_domain (&domain)) |
254 | return NSS_STATUS_UNAVAIL; | |
255 | ||
32c075e1 | 256 | if (buflen < sizeof *data + 1 + pad) |
6259ec0d UD |
257 | { |
258 | *h_errnop = NETDB_INTERNAL; | |
d71b808a | 259 | *errnop = ERANGE; |
6259ec0d UD |
260 | return NSS_STATUS_TRYAGAIN; |
261 | } | |
32c075e1 | 262 | buflen -= pad; |
cd897fe7 | 263 | |
ab9a9ff8 UD |
264 | /* Convert name to lowercase. */ |
265 | size_t namlen = strlen (name); | |
266 | char name2[namlen + 1]; | |
267 | size_t i; | |
cd897fe7 | 268 | |
ab9a9ff8 UD |
269 | for (i = 0; i < namlen; ++i) |
270 | name2[i] = tolower (name[i]); | |
271 | name2[i] = '\0'; | |
cd897fe7 | 272 | |
ab9a9ff8 UD |
273 | char *result; |
274 | int len; | |
275 | int yperr = yp_match (domain, "hosts.byname", name2, namlen, &result, &len); | |
6259ec0d | 276 | |
ab9a9ff8 | 277 | if (__builtin_expect (yperr != YPERR_SUCCESS, 0)) |
6259ec0d | 278 | { |
ab9a9ff8 UD |
279 | enum nss_status retval = yperr2nss (yperr); |
280 | ||
6259ec0d UD |
281 | if (retval == NSS_STATUS_TRYAGAIN) |
282 | { | |
283 | *h_errnop = TRY_AGAIN; | |
d71b808a | 284 | *errnop = errno; |
6259ec0d UD |
285 | } |
286 | if (retval == NSS_STATUS_NOTFOUND) | |
287 | *h_errnop = HOST_NOT_FOUND; | |
288 | return retval; | |
289 | } | |
290 | ||
ab9a9ff8 UD |
291 | const size_t linebuflen = buffer + buflen - data->linebuffer; |
292 | if (__builtin_expect ((size_t) (len + 1) > linebuflen, 0)) | |
6259ec0d UD |
293 | { |
294 | free (result); | |
295 | *h_errnop = NETDB_INTERNAL; | |
d71b808a | 296 | *errnop = ERANGE; |
6259ec0d UD |
297 | return NSS_STATUS_TRYAGAIN; |
298 | } | |
299 | ||
ab9a9ff8 | 300 | char *p = strncpy (data->linebuffer, result, len); |
6259ec0d UD |
301 | data->linebuffer[len] = '\0'; |
302 | while (isspace (*p)) | |
303 | ++p; | |
304 | free (result); | |
305 | ||
ab9a9ff8 | 306 | int parse_res = parse_line (p, host, data, buflen, errnop, af, flags); |
6259ec0d | 307 | |
ab9a9ff8 | 308 | if (__builtin_expect (parse_res < 1 || host->h_addrtype != af, 0)) |
6259ec0d | 309 | { |
60c96635 | 310 | if (parse_res == -1) |
6259ec0d UD |
311 | { |
312 | *h_errnop = NETDB_INTERNAL; | |
313 | return NSS_STATUS_TRYAGAIN; | |
314 | } | |
315 | else | |
316 | { | |
317 | *h_errnop = HOST_NOT_FOUND; | |
318 | return NSS_STATUS_NOTFOUND; | |
319 | } | |
320 | } | |
321 | ||
322 | *h_errnop = NETDB_SUCCESS; | |
323 | return NSS_STATUS_SUCCESS; | |
324 | } | |
325 | ||
1e275b9e UD |
326 | enum nss_status |
327 | _nss_nis_gethostbyname2_r (const char *name, int af, struct hostent *host, | |
328 | char *buffer, size_t buflen, int *errnop, | |
329 | int *h_errnop) | |
330 | { | |
331 | return internal_gethostbyname2_r (name, af, host, buffer, buflen, errnop, | |
332 | h_errnop, | |
333 | ((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0)); | |
334 | } | |
335 | ||
0d8733c4 | 336 | enum nss_status |
d71b808a UD |
337 | _nss_nis_gethostbyname_r (const char *name, struct hostent *host, char *buffer, |
338 | size_t buflen, int *errnop, int *h_errnop) | |
0d8733c4 UD |
339 | { |
340 | if (_res.options & RES_USE_INET6) | |
341 | { | |
342 | enum nss_status status; | |
343 | ||
1e275b9e UD |
344 | status = internal_gethostbyname2_r (name, AF_INET6, host, buffer, buflen, |
345 | errnop, h_errnop, AI_V4MAPPED); | |
0d8733c4 UD |
346 | if (status == NSS_STATUS_SUCCESS) |
347 | return status; | |
348 | } | |
349 | ||
1e275b9e UD |
350 | return internal_gethostbyname2_r (name, AF_INET, host, buffer, buflen, |
351 | errnop, h_errnop, 0); | |
0d8733c4 UD |
352 | } |
353 | ||
6259ec0d | 354 | enum nss_status |
9d4d69b8 | 355 | _nss_nis_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af, |
6259ec0d | 356 | struct hostent *host, char *buffer, size_t buflen, |
d71b808a | 357 | int *errnop, int *h_errnop) |
6259ec0d | 358 | { |
ab9a9ff8 UD |
359 | char *domain; |
360 | if (__builtin_expect (yp_get_default_domain (&domain), 0)) | |
a334319f | 361 | return NSS_STATUS_UNAVAIL; |
0ecb606c | 362 | |
32c075e1 JJ |
363 | uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data); |
364 | buffer += pad; | |
365 | ||
ab9a9ff8 | 366 | struct parser_data *data = (void *) buffer; |
32c075e1 | 367 | if (__builtin_expect (buflen < sizeof *data + 1 + pad, 0)) |
6259ec0d | 368 | { |
d71b808a | 369 | *errnop = ERANGE; |
6259ec0d UD |
370 | *h_errnop = NETDB_INTERNAL; |
371 | return NSS_STATUS_TRYAGAIN; | |
372 | } | |
32c075e1 | 373 | buflen -= pad; |
6259ec0d | 374 | |
ab9a9ff8 | 375 | char *buf = inet_ntoa (*(const struct in_addr *) addr); |
6259ec0d | 376 | |
ab9a9ff8 UD |
377 | char *result; |
378 | int len; | |
379 | int yperr = yp_match (domain, "hosts.byaddr", buf, strlen (buf), &result, | |
380 | &len); | |
6259ec0d | 381 | |
ab9a9ff8 | 382 | if (__builtin_expect (yperr != YPERR_SUCCESS, 0)) |
6259ec0d | 383 | { |
ab9a9ff8 UD |
384 | enum nss_status retval = yperr2nss (yperr); |
385 | ||
6259ec0d UD |
386 | if (retval == NSS_STATUS_TRYAGAIN) |
387 | { | |
388 | *h_errnop = TRY_AGAIN; | |
d71b808a | 389 | *errnop = errno; |
6259ec0d | 390 | } |
ab9a9ff8 | 391 | else if (retval == NSS_STATUS_NOTFOUND) |
34816665 UD |
392 | *h_errnop = HOST_NOT_FOUND; |
393 | ||
6259ec0d UD |
394 | return retval; |
395 | } | |
396 | ||
ab9a9ff8 UD |
397 | const size_t linebuflen = buffer + buflen - data->linebuffer; |
398 | if (__builtin_expect ((size_t) (len + 1) > linebuflen, 0)) | |
6259ec0d UD |
399 | { |
400 | free (result); | |
d71b808a | 401 | *errnop = ERANGE; |
6259ec0d UD |
402 | *h_errnop = NETDB_INTERNAL; |
403 | return NSS_STATUS_TRYAGAIN; | |
404 | } | |
405 | ||
ab9a9ff8 | 406 | char *p = strncpy (data->linebuffer, result, len); |
6259ec0d UD |
407 | data->linebuffer[len] = '\0'; |
408 | while (isspace (*p)) | |
409 | ++p; | |
410 | free (result); | |
411 | ||
ab9a9ff8 UD |
412 | int parse_res = parse_line (p, host, data, buflen, errnop, af, |
413 | ((_res.options & RES_USE_INET6) | |
414 | ? AI_V4MAPPED : 0)); | |
415 | if (__builtin_expect (parse_res < 1, 0)) | |
6259ec0d | 416 | { |
60c96635 | 417 | if (parse_res == -1) |
6259ec0d UD |
418 | { |
419 | *h_errnop = NETDB_INTERNAL; | |
420 | return NSS_STATUS_TRYAGAIN; | |
421 | } | |
422 | else | |
423 | { | |
424 | *h_errnop = HOST_NOT_FOUND; | |
425 | return NSS_STATUS_NOTFOUND; | |
426 | } | |
427 | } | |
428 | ||
429 | *h_errnop = NETDB_SUCCESS; | |
430 | return NSS_STATUS_SUCCESS; | |
431 | } | |
1e275b9e | 432 | |
eba8c0e2 | 433 | #if 0 |
1e275b9e UD |
434 | enum nss_status |
435 | _nss_nis_getipnodebyname_r (const char *name, int af, int flags, | |
436 | struct hostent *result, char *buffer, | |
437 | size_t buflen, int *errnop, int *herrnop) | |
438 | { | |
439 | return internal_gethostbyname2_r (name, af, result, buffer, buflen, | |
440 | errnop, herrnop, flags); | |
441 | } | |
eba8c0e2 | 442 | #endif |