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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [gethostbydns.c] - Blame information for rev 173

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/*
2
 * ++Copyright++ 1985, 1988, 1993
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. All advertising materials mentioning features or use of this software
16
 *    must display the following acknowledgement:
17
 *      This product includes software developed by the University of
18
 *      California, Berkeley and its contributors.
19
 * 4. Neither the name of the University nor the names of its contributors
20
 *    may be used to endorse or promote products derived from this software
21
 *    without specific prior written permission.
22
 *
23
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33
 * SUCH DAMAGE.
34
 * -
35
 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
36
 *
37
 * Permission to use, copy, modify, and distribute this software for any
38
 * purpose with or without fee is hereby granted, provided that the above
39
 * copyright notice and this permission notice appear in all copies, and that
40
 * the name of Digital Equipment Corporation not be used in advertising or
41
 * publicity pertaining to distribution of the document or software without
42
 * specific, written prior permission.
43
 *
44
 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
45
 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
46
 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
47
 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
48
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
49
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
50
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
51
 * SOFTWARE.
52
 * -
53
 * --Copyright--
54
 */
55
 
56
#if defined(LIBC_SCCS) && !defined(lint)
57
static char sccsid[] = "@(#)gethostnamadr.c     8.1 (Berkeley) 6/4/93";
58
static char fromrcsid[] = "From: Id: gethnamaddr.c,v 8.23 1998/04/07 04:59:46 vixie Exp $";
59
static char rcsid[] = "$Id: gethostbydns.c,v 1.2 2001-09-27 12:01:53 chris Exp $";
60
#endif /* LIBC_SCCS and not lint */
61
 
62
#include <sys/types.h>
63
#include <sys/param.h>
64
#include <sys/socket.h>
65
#include <netinet/in.h>
66
#include <arpa/inet.h>
67
#include <arpa/nameser.h>
68
 
69
#include <stdio.h>
70
#include <unistd.h>
71
#include <string.h>
72
#include <netdb.h>
73
#include <resolv.h>
74
#include <ctype.h>
75
#include <errno.h>
76
#include <syslog.h>
77
 
78
#include "res_config.h"
79
 
80
#define SPRINTF(x) ((size_t)sprintf x)
81
 
82
#define MAXALIASES      35
83
#define MAXADDRS        35
84
 
85
static const char AskedForGot[] =
86
                "gethostby*.gethostanswer: asked for \"%s\", got \"%s\"";
87
 
88
static char *h_addr_ptrs[MAXADDRS + 1];
89
 
90
static struct hostent host;
91
static char *host_aliases[MAXALIASES];
92
static char hostbuf[8*1024];
93
static u_char host_addr[16];    /* IPv4 or IPv6 */
94
 
95
#ifdef RESOLVSORT
96
static void addrsort __P((char **, int));
97
#endif
98
 
99
#if PACKETSZ > 1024
100
#define MAXPACKET       PACKETSZ
101
#else
102
#define MAXPACKET       1024
103
#endif
104
 
105
typedef union {
106
    HEADER hdr;
107
    u_char buf[MAXPACKET];
108
} querybuf;
109
 
110
typedef union {
111
    int32_t al;
112
    char ac;
113
} align;
114
 
115
extern int h_errno;
116
int _dns_ttl_;
117
 
118
#ifdef DEBUG
119
static void
120
dprintf(msg, num)
121
        char *msg;
122
        int num;
123
{
124
        if (_res.options & RES_DEBUG) {
125
                int save = errno;
126
 
127
                printf(msg, num);
128
                errno = save;
129
        }
130
}
131
#else
132
# define dprintf(msg, num) /*nada*/
133
#endif
134
 
135
#define BOUNDED_INCR(x) \
136
        do { \
137
                cp += x; \
138
                if (cp > eom) { \
139
                        h_errno = NO_RECOVERY; \
140
                        return (NULL); \
141
                } \
142
        } while (0)
143
 
144
#define BOUNDS_CHECK(ptr, count) \
145
        do { \
146
                if ((ptr) + (count) > eom) { \
147
                        h_errno = NO_RECOVERY; \
148
                        return (NULL); \
149
                } \
150
        } while (0)
151
 
152
static struct hostent *
153
gethostanswer(answer, anslen, qname, qtype)
154
        const querybuf *answer;
155
        int anslen;
156
        const char *qname;
157
        int qtype;
158
{
159
        register const HEADER *hp;
160
        register const u_char *cp;
161
        register int n;
162
        const u_char *eom, *erdata;
163
        char *bp, **ap, **hap;
164
        int type, class, buflen, ancount, qdcount;
165
        int haveanswer, had_error;
166
        int toobig = 0;
167
        char tbuf[MAXDNAME];
168
        const char *tname;
169
        int (*name_ok) __P((const char *));
170
 
171
        tname = qname;
172
        host.h_name = NULL;
173
        eom = answer->buf + anslen;
174
        switch (qtype) {
175
        case T_A:
176
        case T_AAAA:
177
                name_ok = res_hnok;
178
                break;
179
        case T_PTR:
180
                name_ok = res_dnok;
181
                break;
182
        default:
183
                h_errno = NO_RECOVERY;
184
                return (NULL);  /* XXX should be abort(); */
185
        }
186
        /*
187
         * find first satisfactory answer
188
         */
189
        hp = &answer->hdr;
190
        ancount = ntohs(hp->ancount);
191
        qdcount = ntohs(hp->qdcount);
192
        bp = hostbuf;
193
        buflen = sizeof hostbuf;
194
        cp = answer->buf;
195
        BOUNDED_INCR(HFIXEDSZ);
196
        if (qdcount != 1) {
197
                h_errno = NO_RECOVERY;
198
                return (NULL);
199
        }
200
        n = dn_expand(answer->buf, eom, cp, bp, buflen);
201
        if ((n < 0) || !(*name_ok)(bp)) {
202
                h_errno = NO_RECOVERY;
203
                return (NULL);
204
        }
205
        BOUNDED_INCR(n + QFIXEDSZ);
206
        if (qtype == T_A || qtype == T_AAAA) {
207
                /* res_send() has already verified that the query name is the
208
                 * same as the one we sent; this just gets the expanded name
209
                 * (i.e., with the succeeding search-domain tacked on).
210
                 */
211
                n = strlen(bp) + 1;             /* for the \0 */
212
                if (n >= MAXHOSTNAMELEN) {
213
                        h_errno = NO_RECOVERY;
214
                        return (NULL);
215
                }
216
                host.h_name = bp;
217
                bp += n;
218
                buflen -= n;
219
                /* The qname can be abbreviated, but h_name is now absolute. */
220
                qname = host.h_name;
221
        }
222
        ap = host_aliases;
223
        *ap = NULL;
224
        host.h_aliases = host_aliases;
225
        hap = h_addr_ptrs;
226
        *hap = NULL;
227
        host.h_addr_list = h_addr_ptrs;
228
        haveanswer = 0;
229
        had_error = 0;
230
        _dns_ttl_ = -1;
231
        while (ancount-- > 0 && cp < eom && !had_error) {
232
                n = dn_expand(answer->buf, eom, cp, bp, buflen);
233
                if ((n < 0) || !(*name_ok)(bp)) {
234
                        had_error++;
235
                        continue;
236
                }
237
                cp += n;                        /* name */
238
                BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
239
                type = _getshort(cp);
240
                cp += INT16SZ;                  /* type */
241
                class = _getshort(cp);
242
                cp += INT16SZ;                  /* class */
243
                if (qtype == T_A  && type == T_A)
244
                        _dns_ttl_ = _getlong(cp);
245
                cp += INT32SZ;                  /* TTL */
246
                n = _getshort(cp);
247
                cp += INT16SZ;                  /* len */
248
                BOUNDS_CHECK(cp, n);
249
                erdata = cp + n;
250
                if (class != C_IN) {
251
                        /* XXX - debug? syslog? */
252
                        cp += n;
253
                        continue;               /* XXX - had_error++ ? */
254
                }
255
                if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) {
256
                        if (ap >= &host_aliases[MAXALIASES-1])
257
                                continue;
258
                        n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
259
                        if ((n < 0) || !(*name_ok)(tbuf)) {
260
                                had_error++;
261
                                continue;
262
                        }
263
                        cp += n;
264
                        if (cp != erdata) {
265
                                h_errno = NO_RECOVERY;
266
                                return (NULL);
267
                        }
268
                        /* Store alias. */
269
                        *ap++ = bp;
270
                        n = strlen(bp) + 1;     /* for the \0 */
271
                        if (n >= MAXHOSTNAMELEN) {
272
                                had_error++;
273
                                continue;
274
                        }
275
                        bp += n;
276
                        buflen -= n;
277
                        /* Get canonical name. */
278
                        n = strlen(tbuf) + 1;   /* for the \0 */
279
                        if (n > buflen || n >= MAXHOSTNAMELEN) {
280
                                had_error++;
281
                                continue;
282
                        }
283
                        strcpy(bp, tbuf);
284
                        host.h_name = bp;
285
                        bp += n;
286
                        buflen -= n;
287
                        continue;
288
                }
289
                if (qtype == T_PTR && type == T_CNAME) {
290
                        n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
291
                        if (n < 0 || !res_dnok(tbuf)) {
292
                                had_error++;
293
                                continue;
294
                        }
295
                        cp += n;
296
                        if (cp != erdata) {
297
                                h_errno = NO_RECOVERY;
298
                                return (NULL);
299
                        }
300
                        /* Get canonical name. */
301
                        n = strlen(tbuf) + 1;   /* for the \0 */
302
                        if (n > buflen || n >= MAXHOSTNAMELEN) {
303
                                had_error++;
304
                                continue;
305
                        }
306
                        strcpy(bp, tbuf);
307
                        tname = bp;
308
                        bp += n;
309
                        buflen -= n;
310
                        continue;
311
                }
312
                if (type != qtype) {
313
                        syslog(LOG_NOTICE|LOG_AUTH,
314
        "gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"",
315
                               qname, p_class(C_IN), p_type(qtype),
316
                               p_type(type));
317
                        cp += n;
318
                        continue;               /* XXX - had_error++ ? */
319
                }
320
                switch (type) {
321
                case T_PTR:
322
                        if (strcasecmp(tname, bp) != 0) {
323
                                syslog(LOG_NOTICE|LOG_AUTH,
324
                                       AskedForGot, qname, bp);
325
                                cp += n;
326
                                continue;       /* XXX - had_error++ ? */
327
                        }
328
                        n = dn_expand(answer->buf, eom, cp, bp, buflen);
329
                        if ((n < 0) || !res_hnok(bp)) {
330
                                had_error++;
331
                                break;
332
                        }
333
#if MULTI_PTRS_ARE_ALIASES
334
                        cp += n;
335
                        if (cp != erdata) {
336
                                h_errno = NO_RECOVERY;
337
                                return (NULL);
338
                        }
339
                        if (!haveanswer)
340
                                host.h_name = bp;
341
                        else if (ap < &host_aliases[MAXALIASES-1])
342
                                *ap++ = bp;
343
                        else
344
                                n = -1;
345
                        if (n != -1) {
346
                                n = strlen(bp) + 1;     /* for the \0 */
347
                                if (n >= MAXHOSTNAMELEN) {
348
                                        had_error++;
349
                                        break;
350
                                }
351
                                bp += n;
352
                                buflen -= n;
353
                        }
354
                        break;
355
#else
356
                        host.h_name = bp;
357
                        if (_res.options & RES_USE_INET6) {
358
                                n = strlen(bp) + 1;     /* for the \0 */
359
                                if (n >= MAXHOSTNAMELEN) {
360
                                        had_error++;
361
                                        break;
362
                                }
363
                                bp += n;
364
                                buflen -= n;
365
                                _map_v4v6_hostent(&host, &bp, &buflen);
366
                        }
367
                        h_errno = NETDB_SUCCESS;
368
                        return (&host);
369
#endif
370
                case T_A:
371
                case T_AAAA:
372
                        if (strcasecmp(host.h_name, bp) != 0) {
373
                                syslog(LOG_NOTICE|LOG_AUTH,
374
                                       AskedForGot, host.h_name, bp);
375
                                cp += n;
376
                                continue;       /* XXX - had_error++ ? */
377
                        }
378
                        if (n != host.h_length) {
379
                                cp += n;
380
                                continue;
381
                        }
382
                        if (!haveanswer) {
383
                                register int nn;
384
 
385
                                host.h_name = bp;
386
                                nn = strlen(bp) + 1;    /* for the \0 */
387
                                bp += nn;
388
                                buflen -= nn;
389
                        }
390
 
391
                        bp += sizeof(align) - ((u_long)bp % sizeof(align));
392
 
393
                        if (bp + n >= &hostbuf[sizeof hostbuf]) {
394
                                dprintf("size (%d) too big\n", n);
395
                                had_error++;
396
                                continue;
397
                        }
398
                        if (hap >= &h_addr_ptrs[MAXADDRS-1]) {
399
                                if (!toobig++)
400
                                        dprintf("Too many addresses (%d)\n",
401
                                                MAXADDRS);
402
                                cp += n;
403
                                continue;
404
                        }
405
                        bcopy(cp, *hap++ = bp, n);
406
                        bp += n;
407
                        buflen -= n;
408
                        cp += n;
409
                        if (cp != erdata) {
410
                                h_errno = NO_RECOVERY;
411
                                return (NULL);
412
                        }
413
                        break;
414
                default:
415
                        dprintf("Impossible condition (type=%d)\n", type);
416
                        h_errno = NO_RECOVERY;
417
                        return (NULL);
418
                        /* BIND has abort() here, too risky on bad data */
419
                }
420
                if (!had_error)
421
                        haveanswer++;
422
        }
423
        if (haveanswer) {
424
                *ap = NULL;
425
                *hap = NULL;
426
# if defined(RESOLVSORT)
427
                /*
428
                 * Note: we sort even if host can take only one address
429
                 * in its return structures - should give it the "best"
430
                 * address in that case, not some random one
431
                 */
432
                if (_res.nsort && haveanswer > 1 && qtype == T_A)
433
                        addrsort(h_addr_ptrs, haveanswer);
434
# endif /*RESOLVSORT*/
435
                if (!host.h_name) {
436
                        n = strlen(qname) + 1;  /* for the \0 */
437
                        if (n > buflen || n >= MAXHOSTNAMELEN)
438
                                goto no_recovery;
439
                        strcpy(bp, qname);
440
                        host.h_name = bp;
441
                        bp += n;
442
                        buflen -= n;
443
                }
444
                if (_res.options & RES_USE_INET6)
445
                        _map_v4v6_hostent(&host, &bp, &buflen);
446
                h_errno = NETDB_SUCCESS;
447
                return (&host);
448
        }
449
 no_recovery:
450
        h_errno = NO_RECOVERY;
451
        return (NULL);
452
}
453
 
454
struct hostent *
455
__dns_getanswer(answer, anslen, qname, qtype)
456
        const char *answer;
457
        int anslen;
458
        const char *qname;
459
        int qtype;
460
{
461
        switch(qtype) {
462
        case T_AAAA:
463
                host.h_addrtype = AF_INET6;
464
                host.h_length = IN6ADDRSZ;
465
                break;
466
        case T_A:
467
        default:
468
                host.h_addrtype = AF_INET;
469
                host.h_length = INADDRSZ;
470
                break;
471
        }
472
 
473
        return(gethostanswer((const querybuf *)answer, anslen, qname, qtype));
474
}
475
 
476
struct hostent *
477
_gethostbydnsname(name, af)
478
        const char *name;
479
        int af;
480
{
481
        querybuf buf;
482
        register const char *cp;
483
        char *bp;
484
        int n, size, type, len;
485
 
486
        if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
487
                h_errno = NETDB_INTERNAL;
488
                return (NULL);
489
        }
490
 
491
        switch (af) {
492
        case AF_INET:
493
                size = INADDRSZ;
494
                type = T_A;
495
                break;
496
        case AF_INET6:
497
                size = IN6ADDRSZ;
498
                type = T_AAAA;
499
                break;
500
        default:
501
                h_errno = NETDB_INTERNAL;
502
                errno = EAFNOSUPPORT;
503
                return (NULL);
504
        }
505
 
506
        host.h_addrtype = af;
507
        host.h_length = size;
508
 
509
        /*
510
         * if there aren't any dots, it could be a user-level alias.
511
         * this is also done in res_query() since we are not the only
512
         * function that looks up host names.
513
         */
514
        if (!strchr(name, '.') && (cp = __hostalias(name)))
515
                name = cp;
516
 
517
        /*
518
         * disallow names consisting only of digits/dots, unless
519
         * they end in a dot.
520
         */
521
        if (isdigit((int)name[0]))
522
                for (cp = name;; ++cp) {
523
                        if (!*cp) {
524
                                if (*--cp == '.')
525
                                        break;
526
                                /*
527
                                 * All-numeric, no dot at the end.
528
                                 * Fake up a hostent as if we'd actually
529
                                 * done a lookup.
530
                                 */
531
                                if (inet_pton(af, name, host_addr) <= 0) {
532
                                        h_errno = HOST_NOT_FOUND;
533
                                        return (NULL);
534
                                }
535
                                strncpy(hostbuf, name, MAXDNAME);
536
                                hostbuf[MAXDNAME] = '\0';
537
                                bp = hostbuf + MAXDNAME;
538
                                len = sizeof hostbuf - MAXDNAME;
539
                                host.h_name = hostbuf;
540
                                host.h_aliases = host_aliases;
541
                                host_aliases[0] = NULL;
542
                                h_addr_ptrs[0] = (char *)host_addr;
543
                                h_addr_ptrs[1] = NULL;
544
                                host.h_addr_list = h_addr_ptrs;
545
                                if (_res.options & RES_USE_INET6)
546
                                        _map_v4v6_hostent(&host, &bp, &len);
547
                                h_errno = NETDB_SUCCESS;
548
                                return (&host);
549
                        }
550
                        if (!isdigit((int)*cp) && *cp != '.')
551
                                break;
552
                }
553
        if ((isxdigit((int)name[0]) && strchr(name, ':') != NULL) ||
554
            name[0] == ':')
555
                for (cp = name;; ++cp) {
556
                        if (!*cp) {
557
                                if (*--cp == '.')
558
                                        break;
559
                                /*
560
                                 * All-IPv6-legal, no dot at the end.
561
                                 * Fake up a hostent as if we'd actually
562
                                 * done a lookup.
563
                                 */
564
                                if (inet_pton(af, name, host_addr) <= 0) {
565
                                        h_errno = HOST_NOT_FOUND;
566
                                        return (NULL);
567
                                }
568
                                strncpy(hostbuf, name, MAXDNAME);
569
                                hostbuf[MAXDNAME] = '\0';
570
                                bp = hostbuf + MAXDNAME;
571
                                len = sizeof hostbuf - MAXDNAME;
572
                                host.h_name = hostbuf;
573
                                host.h_aliases = host_aliases;
574
                                host_aliases[0] = NULL;
575
                                h_addr_ptrs[0] = (char *)host_addr;
576
                                h_addr_ptrs[1] = NULL;
577
                                host.h_addr_list = h_addr_ptrs;
578
                                h_errno = NETDB_SUCCESS;
579
                                return (&host);
580
                        }
581
                        if (!isxdigit((int)*cp) && *cp != ':' && *cp != '.')
582
                                break;
583
                }
584
 
585
        if ((n = res_search(name, C_IN, type, buf.buf, sizeof(buf))) < 0) {
586
                dprintf("res_search failed (%d)\n", n);
587
                return (NULL);
588
        }
589
        return (gethostanswer(&buf, n, name, type));
590
}
591
 
592
struct hostent *
593
_gethostbydnsaddr(addr, len, af)
594
        const char *addr;       /* XXX should have been def'd as u_char! */
595
        int len, af;
596
{
597
        const u_char *uaddr = (const u_char *)addr;
598
        static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };
599
        static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
600
        int n, size;
601
        querybuf buf;
602
        register struct hostent *hp;
603
        char qbuf[MAXDNAME+1], *qp;
604
#ifdef SUNSECURITY
605
        register struct hostent *rhp;
606
        char **haddr;
607
        u_long old_options;
608
        char hname2[MAXDNAME+1];
609
#endif /*SUNSECURITY*/
610
 
611
        if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
612
                h_errno = NETDB_INTERNAL;
613
                return (NULL);
614
        }
615
        if (af == AF_INET6 && len == IN6ADDRSZ &&
616
            (!bcmp(uaddr, mapped, sizeof mapped) ||
617
             !bcmp(uaddr, tunnelled, sizeof tunnelled))) {
618
                /* Unmap. */
619
                addr += sizeof mapped;
620
                uaddr += sizeof mapped;
621
                af = AF_INET;
622
                len = INADDRSZ;
623
        }
624
        switch (af) {
625
        case AF_INET:
626
                size = INADDRSZ;
627
                break;
628
        case AF_INET6:
629
                size = IN6ADDRSZ;
630
                break;
631
        default:
632
                errno = EAFNOSUPPORT;
633
                h_errno = NETDB_INTERNAL;
634
                return (NULL);
635
        }
636
        if (size != len) {
637
                errno = EINVAL;
638
                h_errno = NETDB_INTERNAL;
639
                return (NULL);
640
        }
641
        switch (af) {
642
        case AF_INET:
643
                (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
644
                               (uaddr[3] & 0xff),
645
                               (uaddr[2] & 0xff),
646
                               (uaddr[1] & 0xff),
647
                               (uaddr[0] & 0xff));
648
                break;
649
        case AF_INET6:
650
                qp = qbuf;
651
                for (n = IN6ADDRSZ - 1; n >= 0; n--) {
652
                        qp += SPRINTF((qp, "%x.%x.",
653
                                       uaddr[n] & 0xf,
654
                                       (uaddr[n] >> 4) & 0xf));
655
                }
656
                strcpy(qp, "ip6.int");
657
                break;
658
        default:
659
                abort();
660
        }
661
        n = res_query(qbuf, C_IN, T_PTR, (u_char *)buf.buf, sizeof buf.buf);
662
        if (n < 0) {
663
                dprintf("res_query failed (%d)\n", n);
664
                return (NULL);
665
        }
666
        if (!(hp = gethostanswer(&buf, n, qbuf, T_PTR)))
667
                return (NULL);  /* h_errno was set by gethostanswer() */
668
#ifdef SUNSECURITY
669
        if (af == AF_INET) {
670
            /*
671
             * turn off search as the name should be absolute,
672
             * 'localhost' should be matched by defnames
673
             */
674
            strncpy(hname2, hp->h_name, MAXDNAME);
675
            hname2[MAXDNAME] = '\0';
676
            old_options = _res.options;
677
            _res.options &= ~RES_DNSRCH;
678
            _res.options |= RES_DEFNAMES;
679
            if (!(rhp = gethostbyname(hname2))) {
680
                syslog(LOG_NOTICE|LOG_AUTH,
681
                       "gethostbyaddr: No A record for %s (verifying [%s])",
682
                       hname2, inet_ntoa(*((struct in_addr *)addr)));
683
                _res.options = old_options;
684
                h_errno = HOST_NOT_FOUND;
685
                return (NULL);
686
            }
687
            _res.options = old_options;
688
            for (haddr = rhp->h_addr_list; *haddr; haddr++)
689
                if (!memcmp(*haddr, addr, INADDRSZ))
690
                        break;
691
            if (!*haddr) {
692
                syslog(LOG_NOTICE|LOG_AUTH,
693
                       "gethostbyaddr: A record of %s != PTR record [%s]",
694
                       hname2, inet_ntoa(*((struct in_addr *)addr)));
695
                h_errno = HOST_NOT_FOUND;
696
                return (NULL);
697
            }
698
        }
699
#endif /*SUNSECURITY*/
700
        hp->h_addrtype = af;
701
        hp->h_length = len;
702
        bcopy(addr, host_addr, len);
703
        h_addr_ptrs[0] = (char *)host_addr;
704
        h_addr_ptrs[1] = NULL;
705
        if (af == AF_INET && (_res.options & RES_USE_INET6)) {
706
                _map_v4v6_address((char*)host_addr, (char*)host_addr);
707
                hp->h_addrtype = AF_INET6;
708
                hp->h_length = IN6ADDRSZ;
709
        }
710
        h_errno = NETDB_SUCCESS;
711
        return (hp);
712
}
713
 
714
#ifdef RESOLVSORT
715
static void
716
addrsort(ap, num)
717
        char **ap;
718
        int num;
719
{
720
        int i, j;
721
        char **p;
722
        short aval[MAXADDRS];
723
        int needsort = 0;
724
 
725
        p = ap;
726
        for (i = 0; i < num; i++, p++) {
727
            for (j = 0 ; (unsigned)j < _res.nsort; j++)
728
                if (_res.sort_list[j].addr.s_addr ==
729
                    (((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask))
730
                        break;
731
            aval[i] = j;
732
            if (needsort == 0 && i > 0 && j < aval[i-1])
733
                needsort = i;
734
        }
735
        if (!needsort)
736
            return;
737
 
738
        while (needsort < num) {
739
            for (j = needsort - 1; j >= 0; j--) {
740
                if (aval[j] > aval[j+1]) {
741
                    char *hp;
742
 
743
                    i = aval[j];
744
                    aval[j] = aval[j+1];
745
                    aval[j+1] = i;
746
 
747
                    hp = ap[j];
748
                    ap[j] = ap[j+1];
749
                    ap[j+1] = hp;
750
 
751
                } else
752
                    break;
753
            }
754
            needsort++;
755
        }
756
}
757
#endif
758
void
759
_sethostdnsent(stayopen)
760
        int stayopen;
761
{
762
        if ((_res.options & RES_INIT) == 0 && res_init() == -1)
763
                return;
764
        if (stayopen)
765
                _res.options |= RES_STAYOPEN | RES_USEVC;
766
}
767
 
768
void
769
_endhostdnsent()
770
{
771
        _res.options &= ~(RES_STAYOPEN | RES_USEVC);
772
        res_close();
773
}

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