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
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28
29 #include <sys/param.h>
30 #include <sys/socket.h>
31 #include <netinet/in.h>
32 #include <arpa/inet.h>
33 #include <arpa/nameser.h>
34 #include <netdb.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <ctype.h>
38 #include <errno.h>
39 #include <string.h>
40 #include <stdarg.h>
41 #include <nsswitch.h>
42 #include <resolv.h> /* XXX */
43 #ifdef YP
44 #include <rpc/rpc.h>
45 #include <rpcsvc/yp_prot.h>
46 #include <rpcsvc/ypclnt.h>
47 #endif
48 #include "netdb_private.h"
49
50 #ifdef YP
51 static int
_gethostbynis(const char * name,char * map,int af,struct hostent * he,struct hostent_data * hed)52 _gethostbynis(const char *name, char *map, int af, struct hostent *he,
53 struct hostent_data *hed)
54 {
55 char *p, *bp, *ep;
56 char *cp, **q;
57 char *result;
58 int resultlen, size, addrok = 0;
59 char ypbuf[YPMAXRECORD + 2];
60 res_state statp;
61
62 statp = __res_state();
63 switch(af) {
64 case AF_INET:
65 size = NS_INADDRSZ;
66 break;
67 case AF_INET6:
68 size = NS_IN6ADDRSZ;
69 break;
70 default:
71 errno = EAFNOSUPPORT;
72 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
73 return (-1);
74 }
75
76 if (hed->yp_domain == (char *)NULL)
77 if (yp_get_default_domain (&hed->yp_domain)) {
78 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
79 return (-1);
80 }
81
82 if (yp_match(hed->yp_domain, map, name, strlen(name), &result,
83 &resultlen)) {
84 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
85 return (-1);
86 }
87
88 /* avoid potential memory leak */
89 bcopy((char *)result, (char *)&ypbuf, resultlen);
90 ypbuf[resultlen] = '\0';
91 free(result);
92 result = (char *)&ypbuf;
93
94 if ((cp = strchr(result, '\n')))
95 *cp = '\0';
96
97 cp = strpbrk(result, " \t");
98 *cp++ = '\0';
99 he->h_addr_list = hed->h_addr_ptrs;
100 he->h_addr = (char *)hed->host_addr;
101 switch (af) {
102 case AF_INET:
103 addrok = inet_aton(result, (struct in_addr *)hed->host_addr);
104 if (addrok != 1)
105 break;
106 if (statp->options & RES_USE_INET6) {
107 _map_v4v6_address((char *)hed->host_addr,
108 (char *)hed->host_addr);
109 af = AF_INET6;
110 size = NS_IN6ADDRSZ;
111 }
112 break;
113 case AF_INET6:
114 addrok = inet_pton(af, result, hed->host_addr);
115 break;
116 }
117 if (addrok != 1) {
118 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
119 return (-1);
120 }
121 he->h_addr_list[1] = NULL;
122 he->h_length = size;
123 he->h_addrtype = af;
124 while (*cp == ' ' || *cp == '\t')
125 cp++;
126 bp = hed->hostbuf;
127 ep = hed->hostbuf + sizeof hed->hostbuf;
128 he->h_name = bp;
129 q = he->h_aliases = hed->host_aliases;
130 p = strpbrk(cp, " \t");
131 if (p != NULL)
132 *p++ = '\0';
133 size = strlen(cp) + 1;
134 if (ep - bp < size) {
135 RES_SET_H_ERRNO(statp, NO_RECOVERY);
136 return (-1);
137 }
138 strlcpy(bp, cp, ep - bp);
139 bp += size;
140 cp = p;
141 while (cp && *cp) {
142 if (*cp == ' ' || *cp == '\t') {
143 cp++;
144 continue;
145 }
146 if (q >= &hed->host_aliases[_MAXALIASES - 1])
147 break;
148 p = strpbrk(cp, " \t");
149 if (p != NULL)
150 *p++ = '\0';
151 size = strlen(cp) + 1;
152 if (ep - bp < size)
153 break;
154 strlcpy(bp, cp, ep - bp);
155 *q++ = bp;
156 bp += size;
157 cp = p;
158 }
159 *q = NULL;
160 return (0);
161 }
162
163 static int
_gethostbynisname_r(const char * name,int af,struct hostent * he,struct hostent_data * hed)164 _gethostbynisname_r(const char *name, int af, struct hostent *he,
165 struct hostent_data *hed)
166 {
167 char *map;
168
169 switch (af) {
170 case AF_INET:
171 map = "hosts.byname";
172 break;
173 default:
174 map = "ipnodes.byname";
175 break;
176 }
177 return (_gethostbynis(name, map, af, he, hed));
178 }
179
180 static int
_gethostbynisaddr_r(const void * addr,socklen_t len,int af,struct hostent * he,struct hostent_data * hed)181 _gethostbynisaddr_r(const void *addr, socklen_t len, int af,
182 struct hostent *he, struct hostent_data *hed)
183 {
184 char *map;
185 char numaddr[46];
186
187 switch (af) {
188 case AF_INET:
189 map = "hosts.byaddr";
190 break;
191 default:
192 map = "ipnodes.byaddr";
193 break;
194 }
195 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL)
196 return (-1);
197 return (_gethostbynis(numaddr, map, af, he, hed));
198 }
199 #endif /* YP */
200
201 /* XXX _gethostbynisname/_gethostbynisaddr only used by getipnodeby*() */
202 struct hostent *
_gethostbynisname(const char * name,int af)203 _gethostbynisname(const char *name, int af)
204 {
205 #ifdef YP
206 struct hostent *he;
207 struct hostent_data *hed;
208 u_long oresopt;
209 int error;
210 res_state statp;
211
212 statp = __res_state();
213 if ((he = __hostent_init()) == NULL ||
214 (hed = __hostent_data_init()) == NULL) {
215 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
216 return (NULL);
217 }
218
219 oresopt = statp->options;
220 statp->options &= ~RES_USE_INET6;
221 error = _gethostbynisname_r(name, af, he, hed);
222 statp->options = oresopt;
223 return (error == 0) ? he : NULL;
224 #else
225 return (NULL);
226 #endif
227 }
228
229 struct hostent *
_gethostbynisaddr(const void * addr,socklen_t len,int af)230 _gethostbynisaddr(const void *addr, socklen_t len, int af)
231 {
232 #ifdef YP
233 struct hostent *he;
234 struct hostent_data *hed;
235 u_long oresopt;
236 int error;
237 res_state statp;
238
239 statp = __res_state();
240 if ((he = __hostent_init()) == NULL ||
241 (hed = __hostent_data_init()) == NULL) {
242 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
243 return (NULL);
244 }
245
246 oresopt = statp->options;
247 statp->options &= ~RES_USE_INET6;
248 error = _gethostbynisaddr_r(addr, len, af, he, hed);
249 statp->options = oresopt;
250 return (error == 0) ? he : NULL;
251 #else
252 return (NULL);
253 #endif
254 }
255
256 int
_nis_gethostbyname(void * rval,void * cb_data,va_list ap)257 _nis_gethostbyname(void *rval, void *cb_data, va_list ap)
258 {
259 #ifdef YP
260 const char *name;
261 int af;
262 char *buffer;
263 size_t buflen;
264 int *errnop, *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 *errnop = errno;
292 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
293 *h_errnop = statp->res_h_errno;
294 return (NS_RETURN);
295 }
296 *((struct hostent **)rval) = hptr;
297 return (NS_SUCCESS);
298 #else
299 *((struct hostent **)rval) = NULL;
300 return (NS_UNAVAIL);
301 #endif
302 }
303
304 int
_nis_gethostbyaddr(void * rval,void * cb_data,va_list ap)305 _nis_gethostbyaddr(void *rval, void *cb_data, va_list ap)
306 {
307 #ifdef YP
308 const void *addr;
309 socklen_t len;
310 int af;
311 char *buffer;
312 size_t buflen;
313 int *errnop, *h_errnop;
314 struct hostent *hptr, he;
315 struct hostent_data *hed;
316 res_state statp;
317
318 addr = va_arg(ap, const void *);
319 len = va_arg(ap, socklen_t);
320 af = va_arg(ap, int);
321 hptr = va_arg(ap, struct hostent *);
322 buffer = va_arg(ap, char *);
323 buflen = va_arg(ap, size_t);
324 errnop = va_arg(ap, int *);
325 h_errnop = va_arg(ap, int *);
326
327 *((struct hostent **)rval) = NULL;
328
329 statp = __res_state();
330 if ((hed = __hostent_data_init()) == NULL) {
331 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
332 *h_errnop = statp->res_h_errno;
333 return (NS_NOTFOUND);
334 }
335
336 if (_gethostbynisaddr_r(addr, len, af, &he, hed) != 0) {
337 *h_errnop = statp->res_h_errno;
338 return (NS_NOTFOUND);
339 }
340 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
341 *errnop = errno;
342 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
343 *h_errnop = statp->res_h_errno;
344 return (NS_RETURN);
345 }
346 *((struct hostent **)rval) = hptr;
347 return (NS_SUCCESS);
348 #else
349 *((struct hostent **)rval) = NULL;
350 return (NS_UNAVAIL);
351 #endif
352 }
353