1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1985, 1988, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 * -
31 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
32 *
33 * Permission to use, copy, modify, and distribute this software for any
34 * purpose with or without fee is hereby granted, provided that the above
35 * copyright notice and this permission notice appear in all copies, and that
36 * the name of Digital Equipment Corporation not be used in advertising or
37 * publicity pertaining to distribution of the document or software without
38 * specific, written prior permission.
39 *
40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
47 * SOFTWARE.
48 * -
49 * --Copyright--
50 */
51
52 #if defined(LIBC_SCCS) && !defined(lint)
53 static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
54 #endif /* LIBC_SCCS and not lint */
55 #include <sys/param.h>
56 #include <sys/socket.h>
57 #include <netinet/in.h>
58 #include <arpa/inet.h>
59 #include <netdb.h>
60 #include <stdio.h>
61 #include <ctype.h>
62 #include <errno.h>
63 #include <string.h>
64 #include <stdarg.h>
65 #include <nsswitch.h>
66 #include <arpa/nameser.h> /* XXX */
67 #include <resolv.h> /* XXX */
68 #include "netdb_private.h"
69
70 void
_sethosthtent(int f,struct hostent_data * hed)71 _sethosthtent(int f, struct hostent_data *hed)
72 {
73 if (!hed->hostf)
74 hed->hostf = fopen(_PATH_HOSTS, "re");
75 else
76 rewind(hed->hostf);
77 hed->stayopen = f;
78 }
79
80 void
_endhosthtent(struct hostent_data * hed)81 _endhosthtent(struct hostent_data *hed)
82 {
83 if (hed->hostf && !hed->stayopen) {
84 (void) fclose(hed->hostf);
85 hed->hostf = NULL;
86 }
87 }
88
89 static int
gethostent_p(struct hostent * he,struct hostent_data * hed,int mapped,res_state statp)90 gethostent_p(struct hostent *he, struct hostent_data *hed, int mapped,
91 res_state statp)
92 {
93 char *p, *bp, *ep;
94 char *cp, **q;
95 int af, len;
96 char hostbuf[BUFSIZ + 1];
97
98 if (!hed->hostf && !(hed->hostf = fopen(_PATH_HOSTS, "re"))) {
99 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
100 return (-1);
101 }
102 again:
103 if (!(p = fgets(hostbuf, sizeof hostbuf, hed->hostf))) {
104 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
105 return (-1);
106 }
107 if (*p == '#')
108 goto again;
109 cp = strpbrk(p, "#\n");
110 if (cp != NULL)
111 *cp = '\0';
112 if (!(cp = strpbrk(p, " \t")))
113 goto again;
114 *cp++ = '\0';
115 if (inet_pton(AF_INET6, p, hed->host_addr) > 0) {
116 af = AF_INET6;
117 len = IN6ADDRSZ;
118 } else if (inet_pton(AF_INET, p, hed->host_addr) > 0) {
119 if (mapped) {
120 _map_v4v6_address((char *)hed->host_addr,
121 (char *)hed->host_addr);
122 af = AF_INET6;
123 len = IN6ADDRSZ;
124 } else {
125 af = AF_INET;
126 len = INADDRSZ;
127 }
128 } else {
129 goto again;
130 }
131 hed->h_addr_ptrs[0] = (char *)hed->host_addr;
132 hed->h_addr_ptrs[1] = NULL;
133 he->h_addr_list = hed->h_addr_ptrs;
134 he->h_length = len;
135 he->h_addrtype = af;
136 while (*cp == ' ' || *cp == '\t')
137 cp++;
138 bp = hed->hostbuf;
139 ep = hed->hostbuf + sizeof hed->hostbuf;
140 he->h_name = bp;
141 q = he->h_aliases = hed->host_aliases;
142 if ((p = strpbrk(cp, " \t")) != NULL)
143 *p++ = '\0';
144 len = strlen(cp) + 1;
145 if (ep - bp < len) {
146 RES_SET_H_ERRNO(statp, NO_RECOVERY);
147 return (-1);
148 }
149 strlcpy(bp, cp, ep - bp);
150 bp += len;
151 cp = p;
152 while (cp && *cp) {
153 if (*cp == ' ' || *cp == '\t') {
154 cp++;
155 continue;
156 }
157 if (q >= &hed->host_aliases[_MAXALIASES - 1])
158 break;
159 if ((p = strpbrk(cp, " \t")) != NULL)
160 *p++ = '\0';
161 len = strlen(cp) + 1;
162 if (ep - bp < len)
163 break;
164 strlcpy(bp, cp, ep - bp);
165 *q++ = bp;
166 bp += len;
167 cp = p;
168 }
169 *q = NULL;
170 RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
171 return (0);
172 }
173
174 int
gethostent_r(struct hostent * hptr,char * buffer,size_t buflen,struct hostent ** result,int * h_errnop)175 gethostent_r(struct hostent *hptr, char *buffer, size_t buflen,
176 struct hostent **result, int *h_errnop)
177 {
178 struct hostent_data *hed;
179 struct hostent he;
180 res_state statp;
181
182 statp = __res_state();
183 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
184 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
185 *h_errnop = statp->res_h_errno;
186 return (-1);
187 }
188 if ((hed = __hostent_data_init()) == NULL) {
189 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
190 *h_errnop = statp->res_h_errno;
191 return (-1);
192 }
193 if (gethostent_p(&he, hed, statp->options & RES_USE_INET6, statp) != 0)
194 return (-1);
195 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
196 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
197 *h_errnop = statp->res_h_errno;
198 return ((errno != 0) ? errno : -1);
199 }
200 *result = hptr;
201 return (0);
202 }
203
204 struct hostent *
gethostent(void)205 gethostent(void)
206 {
207 struct hostdata *hd;
208 struct hostent *rval;
209 int ret_h_errno;
210
211 if ((hd = __hostdata_init()) == NULL)
212 return (NULL);
213 if (gethostent_r(&hd->host, hd->data, sizeof(hd->data), &rval,
214 &ret_h_errno) != 0)
215 return (NULL);
216 return (rval);
217 }
218
219 int
_ht_gethostbyname(void * rval,void * cb_data,va_list ap)220 _ht_gethostbyname(void *rval, void *cb_data, va_list ap)
221 {
222 const char *name;
223 int af;
224 char *buffer;
225 size_t buflen;
226 int *errnop, *h_errnop;
227 struct hostent *hptr, he;
228 struct hostent_data *hed;
229 char **cp;
230 res_state statp;
231 int error;
232
233 name = va_arg(ap, const char *);
234 af = va_arg(ap, int);
235 hptr = va_arg(ap, struct hostent *);
236 buffer = va_arg(ap, char *);
237 buflen = va_arg(ap, size_t);
238 errnop = va_arg(ap, int *);
239 h_errnop = va_arg(ap, int *);
240
241 *((struct hostent **)rval) = NULL;
242
243 statp = __res_state();
244 if ((hed = __hostent_data_init()) == NULL) {
245 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
246 *h_errnop = statp->res_h_errno;
247 return (NS_NOTFOUND);
248 }
249
250 _sethosthtent(0, hed);
251 while ((error = gethostent_p(&he, hed, 0, statp)) == 0) {
252 if (he.h_addrtype != af)
253 continue;
254 if (he.h_addrtype == AF_INET &&
255 statp->options & RES_USE_INET6) {
256 _map_v4v6_address(he.h_addr, he.h_addr);
257 he.h_length = IN6ADDRSZ;
258 he.h_addrtype = AF_INET6;
259 }
260 if (strcasecmp(he.h_name, name) == 0)
261 break;
262 for (cp = he.h_aliases; *cp != 0; cp++)
263 if (strcasecmp(*cp, name) == 0)
264 goto found;
265 }
266 found:
267 _endhosthtent(hed);
268
269 if (error != 0) {
270 *h_errnop = statp->res_h_errno;
271 return (NS_NOTFOUND);
272 }
273 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
274 *errnop = errno;
275 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
276 *h_errnop = statp->res_h_errno;
277 return (NS_RETURN);
278 }
279 *((struct hostent **)rval) = hptr;
280 return (NS_SUCCESS);
281 }
282
283 int
_ht_gethostbyaddr(void * rval,void * cb_data,va_list ap)284 _ht_gethostbyaddr(void *rval, void *cb_data, va_list ap)
285 {
286 const void *addr;
287 socklen_t len;
288 int af;
289 char *buffer;
290 size_t buflen;
291 int *errnop, *h_errnop;
292 struct hostent *hptr, he;
293 struct hostent_data *hed;
294 res_state statp;
295 int error;
296
297 addr = va_arg(ap, const void *);
298 len = va_arg(ap, socklen_t);
299 af = va_arg(ap, int);
300 hptr = va_arg(ap, struct hostent *);
301 buffer = va_arg(ap, char *);
302 buflen = va_arg(ap, size_t);
303 errnop = va_arg(ap, int *);
304 h_errnop = va_arg(ap, int *);
305
306 *((struct hostent **)rval) = NULL;
307
308 statp = __res_state();
309 if ((hed = __hostent_data_init()) == NULL) {
310 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
311 *h_errnop = statp->res_h_errno;
312 return (NS_NOTFOUND);
313 }
314
315 _sethosthtent(0, hed);
316 while ((error = gethostent_p(&he, hed, 0, statp)) == 0)
317 if (he.h_addrtype == af && !bcmp(he.h_addr, addr, len)) {
318 if (he.h_addrtype == AF_INET &&
319 statp->options & RES_USE_INET6) {
320 _map_v4v6_address(he.h_addr, he.h_addr);
321 he.h_length = IN6ADDRSZ;
322 he.h_addrtype = AF_INET6;
323 }
324 break;
325 }
326 _endhosthtent(hed);
327
328 if (error != 0)
329 return (NS_NOTFOUND);
330 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
331 *errnop = errno;
332 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
333 *h_errnop = statp->res_h_errno;
334 return (NS_RETURN);
335 }
336 *((struct hostent **)rval) = hptr;
337 return (NS_SUCCESS);
338 }
339