1 /*-
2 * Copyright (c) 1994, Garrett Wollman
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 * $FreeBSD: src/lib/libc/net/gethostbynis.c,v 1.28 2006/05/12 15:37:23 ume Exp $
26 */
27
28 #include <sys/param.h>
29 #include <sys/socket.h>
30 #include <netinet/in.h>
31 #include <arpa/inet.h>
32 #include <arpa/nameser.h>
33 #include <netdb.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <ctype.h>
37 #include <errno.h>
38 #include <string.h>
39 #include <stdarg.h>
40 #include <nsswitch.h>
41 #include <resolv.h> /* XXX */
42 #ifdef YP
43 #include <rpc/rpc.h>
44 #include <rpcsvc/yp_prot.h>
45 #include <rpcsvc/ypclnt.h>
46 #endif
47 #include "netdb_private.h"
48
49 #ifdef YP
50 static int
_gethostbynis(const char * name,char * map,int af,struct hostent * he,struct hostent_data * hed)51 _gethostbynis(const char *name, char *map, int af, struct hostent *he,
52 struct hostent_data *hed)
53 {
54 char *p, *bp, *ep;
55 char *cp, **q;
56 char *result;
57 int resultlen, size, addrok = 0;
58 char ypbuf[YPMAXRECORD + 2];
59 res_state statp;
60
61 statp = __res_state();
62 switch(af) {
63 case AF_INET:
64 size = NS_INADDRSZ;
65 break;
66 case AF_INET6:
67 size = NS_IN6ADDRSZ;
68 break;
69 default:
70 errno = EAFNOSUPPORT;
71 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
72 return (-1);
73 }
74
75 if (hed->yp_domain == NULL)
76 if (yp_get_default_domain (&hed->yp_domain)) {
77 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
78 return (-1);
79 }
80
81 if (yp_match(hed->yp_domain, map, name, strlen(name), &result,
82 &resultlen)) {
83 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
84 return (-1);
85 }
86
87 /* avoid potential memory leak */
88 bcopy((char *)result, (char *)&ypbuf, resultlen);
89 ypbuf[resultlen] = '\0';
90 free(result);
91 result = (char *)&ypbuf;
92
93 if ((cp = index(result, '\n')))
94 *cp = '\0';
95
96 cp = strpbrk(result, " \t");
97 *cp++ = '\0';
98 he->h_addr_list = hed->h_addr_ptrs;
99 he->h_addr = (char *)hed->host_addr;
100 switch (af) {
101 case AF_INET:
102 addrok = inet_aton(result, (struct in_addr *)hed->host_addr);
103 if (addrok != 1)
104 break;
105 if (statp->options & RES_USE_INET6) {
106 _map_v4v6_address((char *)hed->host_addr,
107 (char *)hed->host_addr);
108 af = AF_INET6;
109 size = NS_IN6ADDRSZ;
110 }
111 break;
112 case AF_INET6:
113 addrok = inet_pton(af, result, hed->host_addr);
114 break;
115 }
116 if (addrok != 1) {
117 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
118 return (-1);
119 }
120 he->h_addr_list[1] = NULL;
121 he->h_length = size;
122 he->h_addrtype = af;
123 while (*cp == ' ' || *cp == '\t')
124 cp++;
125 bp = hed->hostbuf;
126 ep = hed->hostbuf + sizeof hed->hostbuf;
127 he->h_name = bp;
128 q = he->h_aliases = hed->host_aliases;
129 p = strpbrk(cp, " \t");
130 if (p != NULL)
131 *p++ = '\0';
132 size = strlen(cp) + 1;
133 if (ep - bp < size) {
134 RES_SET_H_ERRNO(statp, NO_RECOVERY);
135 return (-1);
136 }
137 strlcpy(bp, cp, ep - bp);
138 bp += size;
139 cp = p;
140 while (cp && *cp) {
141 if (*cp == ' ' || *cp == '\t') {
142 cp++;
143 continue;
144 }
145 if (q >= &hed->host_aliases[_MAXALIASES - 1])
146 break;
147 p = strpbrk(cp, " \t");
148 if (p != NULL)
149 *p++ = '\0';
150 size = strlen(cp) + 1;
151 if (ep - bp < size)
152 break;
153 strlcpy(bp, cp, ep - bp);
154 *q++ = bp;
155 bp += size;
156 cp = p;
157 }
158 *q = NULL;
159 return (0);
160 }
161
162 static int
_gethostbynisname_r(const char * name,int af,struct hostent * he,struct hostent_data * hed)163 _gethostbynisname_r(const char *name, int af, struct hostent *he,
164 struct hostent_data *hed)
165 {
166 char *map;
167
168 switch (af) {
169 case AF_INET:
170 map = "hosts.byname";
171 break;
172 default:
173 map = "ipnodes.byname";
174 break;
175 }
176 return (_gethostbynis(name, map, af, he, hed));
177 }
178
179 static int
_gethostbynisaddr_r(const void * addr,socklen_t len __unused,int af,struct hostent * he,struct hostent_data * hed)180 _gethostbynisaddr_r(const void *addr, socklen_t len __unused, int af,
181 struct hostent *he, struct hostent_data *hed)
182 {
183 char *map;
184 char numaddr[46];
185
186 switch (af) {
187 case AF_INET:
188 map = "hosts.byaddr";
189 break;
190 default:
191 map = "ipnodes.byaddr";
192 break;
193 }
194 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL)
195 return (-1);
196 return (_gethostbynis(numaddr, map, af, he, hed));
197 }
198 #endif /* YP */
199
200 /* XXX _gethostbynisname/_gethostbynisaddr only used by getipnodeby*() */
201 struct hostent *
_gethostbynisname(const char * name,int af)202 _gethostbynisname(const char *name, int af)
203 {
204 #ifdef YP
205 struct hostent *he;
206 struct hostent_data *hed;
207 u_long oresopt;
208 int error;
209 res_state statp;
210
211 statp = __res_state();
212 if ((he = __hostent_init()) == NULL ||
213 (hed = __hostent_data_init()) == NULL) {
214 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
215 return (NULL);
216 }
217
218 oresopt = statp->options;
219 statp->options &= ~RES_USE_INET6;
220 error = _gethostbynisname_r(name, af, he, hed);
221 statp->options = oresopt;
222 return (error == 0) ? he : NULL;
223 #else
224 return (NULL);
225 #endif
226 }
227
228 struct hostent *
_gethostbynisaddr(const void * addr,socklen_t len,int af)229 _gethostbynisaddr(const void *addr, socklen_t len, int af)
230 {
231 #ifdef YP
232 struct hostent *he;
233 struct hostent_data *hed;
234 u_long oresopt;
235 int error;
236 res_state statp;
237
238 statp = __res_state();
239 if ((he = __hostent_init()) == NULL ||
240 (hed = __hostent_data_init()) == NULL) {
241 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
242 return (NULL);
243 }
244
245 oresopt = statp->options;
246 statp->options &= ~RES_USE_INET6;
247 error = _gethostbynisaddr_r(addr, len, af, he, hed);
248 statp->options = oresopt;
249 return (error == 0) ? he : NULL;
250 #else
251 return (NULL);
252 #endif
253 }
254
255 int
_nis_gethostbyname(void * rval,void * cb_data __unused,va_list ap)256 _nis_gethostbyname(void *rval, void *cb_data __unused, va_list ap)
257 {
258 #ifdef YP
259 const char *name;
260 int af;
261 char *buffer;
262 size_t buflen;
263 int *errnop __unused;
264 int *h_errnop;
265 struct hostent *hptr, he;
266 struct hostent_data *hed;
267 res_state statp;
268
269 name = va_arg(ap, const char *);
270 af = va_arg(ap, int);
271 hptr = va_arg(ap, struct hostent *);
272 buffer = va_arg(ap, char *);
273 buflen = va_arg(ap, size_t);
274 errnop = va_arg(ap, int *);
275 h_errnop = va_arg(ap, int *);
276
277 *((struct hostent **)rval) = NULL;
278
279 statp = __res_state();
280 if ((hed = __hostent_data_init()) == NULL) {
281 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
282 *h_errnop = statp->res_h_errno;
283 return (NS_NOTFOUND);
284 }
285
286 if (_gethostbynisname_r(name, af, &he, hed) != 0) {
287 *h_errnop = statp->res_h_errno;
288 return (NS_NOTFOUND);
289 }
290 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
291 *h_errnop = statp->res_h_errno;
292 return (NS_NOTFOUND);
293 }
294 *((struct hostent **)rval) = hptr;
295 return (NS_SUCCESS);
296 #else
297 *((struct hostent **)rval) = NULL;
298 return (NS_UNAVAIL);
299 #endif
300 }
301
302 int
_nis_gethostbyaddr(void * rval,void * cb_data __unused,va_list ap)303 _nis_gethostbyaddr(void *rval, void *cb_data __unused, va_list ap)
304 {
305 #ifdef YP
306 const void *addr;
307 socklen_t len;
308 int af;
309 char *buffer;
310 size_t buflen;
311 int *errnop __unused;
312 int *h_errnop;
313 struct hostent *hptr, he;
314 struct hostent_data *hed;
315 res_state statp;
316
317 addr = va_arg(ap, const void *);
318 len = va_arg(ap, socklen_t);
319 af = va_arg(ap, int);
320 hptr = va_arg(ap, struct hostent *);
321 buffer = va_arg(ap, char *);
322 buflen = va_arg(ap, size_t);
323 errnop = va_arg(ap, int *);
324 h_errnop = va_arg(ap, int *);
325
326 *((struct hostent **)rval) = NULL;
327
328 statp = __res_state();
329 if ((hed = __hostent_data_init()) == NULL) {
330 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
331 *h_errnop = statp->res_h_errno;
332 return (NS_NOTFOUND);
333 }
334
335 if (_gethostbynisaddr_r(addr, len, af, &he, hed) != 0) {
336 *h_errnop = statp->res_h_errno;
337 return (NS_NOTFOUND);
338 }
339 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
340 *h_errnop = statp->res_h_errno;
341 return (NS_NOTFOUND);
342 }
343 *((struct hostent **)rval) = hptr;
344 return (NS_SUCCESS);
345 #else
346 *((struct hostent **)rval) = NULL;
347 return (NS_UNAVAIL);
348 #endif
349 }
350