1 /*-
2 * Copyright (c) 1985, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 * -
29 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
30 *
31 * Permission to use, copy, modify, and distribute this software for any
32 * purpose with or without fee is hereby granted, provided that the above
33 * copyright notice and this permission notice appear in all copies, and that
34 * the name of Digital Equipment Corporation not be used in advertising or
35 * publicity pertaining to distribution of the document or software without
36 * specific, written prior permission.
37 *
38 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
39 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
40 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
41 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
42 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
43 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
44 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
45 * SOFTWARE.
46 * -
47 * --Copyright--
48 *
49 * @(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93
50 * $FreeBSD: src/lib/libc/net/gethostbyht.c,v 1.27 2007/01/09 00:28:02 imp Exp $
51 */
52
53 #include <sys/param.h>
54 #include <sys/socket.h>
55 #include <netinet/in.h>
56 #include <arpa/inet.h>
57 #include <netdb.h>
58 #include <stdio.h>
59 #include <ctype.h>
60 #include <string.h>
61 #include <stdarg.h>
62 #include <nsswitch.h>
63 #include <arpa/nameser.h> /* XXX */
64 #include <resolv.h> /* XXX */
65 #include "netdb_private.h"
66
67 void
_sethosthtent(int f,struct hostent_data * hed)68 _sethosthtent(int f, struct hostent_data *hed)
69 {
70 if (!hed->hostf)
71 hed->hostf = fopen(_PATH_HOSTS, "r");
72 else
73 rewind(hed->hostf);
74 hed->stayopen = f;
75 }
76
77 void
_endhosthtent(struct hostent_data * hed)78 _endhosthtent(struct hostent_data *hed)
79 {
80 if (hed->hostf && !hed->stayopen) {
81 fclose(hed->hostf);
82 hed->hostf = NULL;
83 }
84 }
85
86 static int
gethostent_p(struct hostent * he,struct hostent_data * hed,int mapped,res_state statp)87 gethostent_p(struct hostent *he, struct hostent_data *hed, int mapped,
88 res_state statp)
89 {
90 char *p, *bp, *ep;
91 char *cp, **q;
92 int af, len;
93 char hostbuf[BUFSIZ + 1];
94
95 if (!hed->hostf && !(hed->hostf = fopen(_PATH_HOSTS, "r"))) {
96 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
97 return (-1);
98 }
99 again:
100 if (!(p = fgets(hostbuf, sizeof hostbuf, hed->hostf))) {
101 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
102 return (-1);
103 }
104 if (*p == '#')
105 goto again;
106 cp = strpbrk(p, "#\n");
107 if (cp != NULL)
108 *cp = '\0';
109 if (!(cp = strpbrk(p, " \t")))
110 goto again;
111 *cp++ = '\0';
112 if (inet_pton(AF_INET6, p, hed->host_addr) > 0) {
113 af = AF_INET6;
114 len = IN6ADDRSZ;
115 } else if (inet_pton(AF_INET, p, hed->host_addr) > 0) {
116 if (mapped) {
117 _map_v4v6_address((char *)hed->host_addr,
118 (char *)hed->host_addr);
119 af = AF_INET6;
120 len = IN6ADDRSZ;
121 } else {
122 af = AF_INET;
123 len = INADDRSZ;
124 }
125 } else {
126 goto again;
127 }
128 hed->h_addr_ptrs[0] = (char *)hed->host_addr;
129 hed->h_addr_ptrs[1] = NULL;
130 he->h_addr_list = hed->h_addr_ptrs;
131 he->h_length = len;
132 he->h_addrtype = af;
133 while (*cp == ' ' || *cp == '\t')
134 cp++;
135 bp = hed->hostbuf;
136 ep = hed->hostbuf + sizeof hed->hostbuf;
137 he->h_name = bp;
138 q = he->h_aliases = hed->host_aliases;
139 if ((p = strpbrk(cp, " \t")) != NULL)
140 *p++ = '\0';
141 len = strlen(cp) + 1;
142 if (ep - bp < len) {
143 RES_SET_H_ERRNO(statp, NO_RECOVERY);
144 return (-1);
145 }
146 strlcpy(bp, cp, ep - bp);
147 bp += len;
148 cp = p;
149 while (cp && *cp) {
150 if (*cp == ' ' || *cp == '\t') {
151 cp++;
152 continue;
153 }
154 if (q >= &hed->host_aliases[_MAXALIASES - 1])
155 break;
156 if ((p = strpbrk(cp, " \t")) != NULL)
157 *p++ = '\0';
158 len = strlen(cp) + 1;
159 if (ep - bp < len)
160 break;
161 strlcpy(bp, cp, ep - bp);
162 *q++ = bp;
163 bp += len;
164 cp = p;
165 }
166 *q = NULL;
167 RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
168 return (0);
169 }
170
171 int
gethostent_r(struct hostent * hptr,char * buffer,size_t buflen,struct hostent ** result,int * h_errnop)172 gethostent_r(struct hostent *hptr, char *buffer, size_t buflen,
173 struct hostent **result, int *h_errnop)
174 {
175 struct hostent_data *hed;
176 struct hostent he;
177 res_state statp;
178
179 statp = __res_state();
180 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
181 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
182 *h_errnop = statp->res_h_errno;
183 return (-1);
184 }
185 if ((hed = __hostent_data_init()) == NULL) {
186 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
187 *h_errnop = statp->res_h_errno;
188 return (-1);
189 }
190 if (gethostent_p(&he, hed, statp->options & RES_USE_INET6, statp) != 0)
191 return (-1);
192 if (__copy_hostent(&he, hptr, buffer, buflen) != 0)
193 return (-1);
194 *result = hptr;
195 return (0);
196 }
197
198 struct hostent *
gethostent(void)199 gethostent(void)
200 {
201 struct hostdata *hd;
202 struct hostent *rval;
203 int ret_h_errno;
204
205 if ((hd = __hostdata_init()) == NULL)
206 return (NULL);
207 if (gethostent_r(&hd->host, hd->data, sizeof(hd->data), &rval,
208 &ret_h_errno) != 0)
209 return (NULL);
210 return (rval);
211 }
212
213 int
_ht_gethostbyname(void * rval,void * cb_data __unused,va_list ap)214 _ht_gethostbyname(void *rval, void *cb_data __unused, va_list ap)
215 {
216 const char *name;
217 int af;
218 char *buffer;
219 size_t buflen;
220 int *errnop __unused;
221 int *h_errnop;
222 struct hostent *hptr, he;
223 struct hostent_data *hed;
224 char **cp;
225 res_state statp;
226 int error;
227
228 name = va_arg(ap, const char *);
229 af = va_arg(ap, int);
230 hptr = va_arg(ap, struct hostent *);
231 buffer = va_arg(ap, char *);
232 buflen = va_arg(ap, size_t);
233 errnop = va_arg(ap, int *);
234 h_errnop = va_arg(ap, int *);
235
236 *((struct hostent **)rval) = NULL;
237
238 statp = __res_state();
239 if ((hed = __hostent_data_init()) == NULL) {
240 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
241 *h_errnop = statp->res_h_errno;
242 return (NS_NOTFOUND);
243 }
244
245 _sethosthtent(0, hed);
246 while ((error = gethostent_p(&he, hed, 0, statp)) == 0) {
247 if (he.h_addrtype != af)
248 continue;
249 if (he.h_addrtype == AF_INET &&
250 statp->options & RES_USE_INET6) {
251 _map_v4v6_address(he.h_addr, he.h_addr);
252 he.h_length = IN6ADDRSZ;
253 he.h_addrtype = AF_INET6;
254 }
255 if (strcasecmp(he.h_name, name) == 0)
256 break;
257 for (cp = he.h_aliases; *cp != NULL; cp++)
258 if (strcasecmp(*cp, name) == 0)
259 goto found;
260 }
261 found:
262 _endhosthtent(hed);
263
264 if (error != 0) {
265 *h_errnop = statp->res_h_errno;
266 return (NS_NOTFOUND);
267 }
268 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
269 *h_errnop = statp->res_h_errno;
270 return (NS_NOTFOUND);
271 }
272 *((struct hostent **)rval) = hptr;
273 return (NS_SUCCESS);
274 }
275
276 int
_ht_gethostbyaddr(void * rval,void * cb_data __unused,va_list ap)277 _ht_gethostbyaddr(void *rval, void *cb_data __unused, va_list ap)
278 {
279 const void *addr;
280 socklen_t len;
281 int af;
282 char *buffer;
283 size_t buflen;
284 int *errnop __unused;
285 int *h_errnop;
286 struct hostent *hptr, he;
287 struct hostent_data *hed;
288 res_state statp;
289 int error;
290
291 addr = va_arg(ap, const void *);
292 len = va_arg(ap, socklen_t);
293 af = va_arg(ap, int);
294 hptr = va_arg(ap, struct hostent *);
295 buffer = va_arg(ap, char *);
296 buflen = va_arg(ap, size_t);
297 errnop = va_arg(ap, int *);
298 h_errnop = va_arg(ap, int *);
299
300 *((struct hostent **)rval) = NULL;
301
302 statp = __res_state();
303 if ((hed = __hostent_data_init()) == NULL) {
304 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
305 *h_errnop = statp->res_h_errno;
306 return (NS_NOTFOUND);
307 }
308
309 _sethosthtent(0, hed);
310 while ((error = gethostent_p(&he, hed, 0, statp)) == 0)
311 if (he.h_addrtype == af && !bcmp(he.h_addr, addr, len)) {
312 if (he.h_addrtype == AF_INET &&
313 statp->options & RES_USE_INET6) {
314 _map_v4v6_address(he.h_addr, he.h_addr);
315 he.h_length = IN6ADDRSZ;
316 he.h_addrtype = AF_INET6;
317 }
318 break;
319 }
320 _endhosthtent(hed);
321
322 if (error != 0)
323 return (NS_NOTFOUND);
324 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
325 *h_errnop = statp->res_h_errno;
326 return (NS_NOTFOUND);
327 }
328 *((struct hostent **)rval) = hptr;
329 return (NS_SUCCESS);
330 }
331