1 /* $OpenLDAP$ */
2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
3 *
4 * Copyright 1998-2021 The OpenLDAP Foundation.
5 * Portions Copyright 1998 A. Hartgers.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted only as authorized by the OpenLDAP
10 * Public License.
11 *
12 * A copy of this license is available in the file LICENSE in the
13 * top-level directory of the distribution or, alternatively, at
14 * <http://www.OpenLDAP.org/license.html>.
15 */
16 /* ACKNOWLEDGEMENTS:
17 * This work was initially developed by Bart Hartgers for inclusion in
18 * OpenLDAP Software.
19 */
20
21 /*
22 * util-int.c Various functions to replace missing threadsafe ones.
23 * Without the real *_r funcs, things will
24 * work, but might not be threadsafe.
25 */
26
27 #include "portable.h"
28
29 #include <ac/stdlib.h>
30
31 #include <ac/errno.h>
32 #include <ac/socket.h>
33 #include <ac/string.h>
34 #include <ac/time.h>
35 #include <ac/unistd.h>
36
37 #include "ldap-int.h"
38
39 #ifndef h_errno
40 /* newer systems declare this in <netdb.h> for you, older ones don't.
41 * harmless to declare it again (unless defined by a macro).
42 */
43 extern int h_errno;
44 #endif
45
46 #ifdef HAVE_HSTRERROR
47 # define HSTRERROR(e) hstrerror(e)
48 #else
49 # define HSTRERROR(e) hp_strerror(e)
50 #endif
51
52 #ifndef LDAP_R_COMPILE
53 # undef HAVE_REENTRANT_FUNCTIONS
54 # undef HAVE_CTIME_R
55 # undef HAVE_GETHOSTBYNAME_R
56 # undef HAVE_GETHOSTBYADDR_R
57
58 #else
59 # include <ldap_pvt_thread.h>
60 ldap_pvt_thread_mutex_t ldap_int_resolv_mutex;
61 ldap_pvt_thread_mutex_t ldap_int_hostname_mutex;
62 static ldap_pvt_thread_mutex_t ldap_int_gettime_mutex;
63
64 # if (defined( HAVE_CTIME_R ) || defined( HAVE_REENTRANT_FUNCTIONS)) \
65 && defined( CTIME_R_NARGS )
66 # define USE_CTIME_R
67 # else
68 static ldap_pvt_thread_mutex_t ldap_int_ctime_mutex;
69 # endif
70
71 /* USE_GMTIME_R and USE_LOCALTIME_R defined in ldap_pvt.h */
72
73 #if !defined( USE_GMTIME_R ) || !defined( USE_LOCALTIME_R )
74 /* we use the same mutex for gmtime(3) and localtime(3)
75 * because implementations may use the same buffer
76 * for both functions */
77 static ldap_pvt_thread_mutex_t ldap_int_gmtime_mutex;
78 #endif
79
80 # if defined(HAVE_GETHOSTBYNAME_R) && \
81 (GETHOSTBYNAME_R_NARGS < 5) || (6 < GETHOSTBYNAME_R_NARGS)
82 /* Don't know how to handle this version, pretend it's not there */
83 # undef HAVE_GETHOSTBYNAME_R
84 # endif
85 # if defined(HAVE_GETHOSTBYADDR_R) && \
86 (GETHOSTBYADDR_R_NARGS < 7) || (8 < GETHOSTBYADDR_R_NARGS)
87 /* Don't know how to handle this version, pretend it's not there */
88 # undef HAVE_GETHOSTBYADDR_R
89 # endif
90 #endif /* LDAP_R_COMPILE */
91
ldap_pvt_ctime(const time_t * tp,char * buf)92 char *ldap_pvt_ctime( const time_t *tp, char *buf )
93 {
94 #ifdef USE_CTIME_R
95 # if (CTIME_R_NARGS > 3) || (CTIME_R_NARGS < 2)
96 # error "CTIME_R_NARGS should be 2 or 3"
97 # elif CTIME_R_NARGS > 2 && defined(CTIME_R_RETURNS_INT)
98 return( ctime_r(tp,buf,26) < 0 ? 0 : buf );
99 # elif CTIME_R_NARGS > 2
100 return ctime_r(tp,buf,26);
101 # else
102 return ctime_r(tp,buf);
103 # endif
104
105 #else
106
107 LDAP_MUTEX_LOCK( &ldap_int_ctime_mutex );
108 AC_MEMCPY( buf, ctime(tp), 26 );
109 LDAP_MUTEX_UNLOCK( &ldap_int_ctime_mutex );
110
111 return buf;
112 #endif
113 }
114
115 #if !defined( USE_GMTIME_R ) || !defined( USE_LOCALTIME_R )
116 int
ldap_pvt_gmtime_lock(void)117 ldap_pvt_gmtime_lock( void )
118 {
119 # ifndef LDAP_R_COMPILE
120 return 0;
121 # else /* LDAP_R_COMPILE */
122 return ldap_pvt_thread_mutex_lock( &ldap_int_gmtime_mutex );
123 # endif /* LDAP_R_COMPILE */
124 }
125
126 int
ldap_pvt_gmtime_unlock(void)127 ldap_pvt_gmtime_unlock( void )
128 {
129 # ifndef LDAP_R_COMPILE
130 return 0;
131 # else /* LDAP_R_COMPILE */
132 return ldap_pvt_thread_mutex_unlock( &ldap_int_gmtime_mutex );
133 # endif /* LDAP_R_COMPILE */
134 }
135 #endif /* !USE_GMTIME_R || !USE_LOCALTIME_R */
136
137 #ifndef USE_GMTIME_R
138 struct tm *
ldap_pvt_gmtime(const time_t * timep,struct tm * result)139 ldap_pvt_gmtime( const time_t *timep, struct tm *result )
140 {
141 struct tm *tm_ptr;
142
143 LDAP_MUTEX_LOCK( &ldap_int_gmtime_mutex );
144 tm_ptr = gmtime( timep );
145 if ( tm_ptr == NULL ) {
146 result = NULL;
147
148 } else {
149 *result = *tm_ptr;
150 }
151 LDAP_MUTEX_UNLOCK( &ldap_int_gmtime_mutex );
152
153 return result;
154 }
155 #endif /* !USE_GMTIME_R */
156
157 #ifndef USE_LOCALTIME_R
158 struct tm *
ldap_pvt_localtime(const time_t * timep,struct tm * result)159 ldap_pvt_localtime( const time_t *timep, struct tm *result )
160 {
161 struct tm *tm_ptr;
162
163 LDAP_MUTEX_LOCK( &ldap_int_gmtime_mutex );
164 tm_ptr = localtime( timep );
165 if ( tm_ptr == NULL ) {
166 result = NULL;
167
168 } else {
169 *result = *tm_ptr;
170 }
171 LDAP_MUTEX_UNLOCK( &ldap_int_gmtime_mutex );
172
173 return result;
174 }
175 #endif /* !USE_LOCALTIME_R */
176
177 static int _ldap_pvt_gt_subs;
178
179 #ifdef _WIN32
180 /* Windows SYSTEMTIME only has 10 millisecond resolution, so we
181 * also need to use a high resolution timer to get nanoseconds.
182 * This is pretty clunky.
183 */
184 static LARGE_INTEGER _ldap_pvt_gt_freq;
185 static LARGE_INTEGER _ldap_pvt_gt_prev;
186 static int _ldap_pvt_gt_offset;
187
188 #define SEC_TO_UNIX_EPOCH 11644473600LL
189 #define TICKS_PER_SECOND 10000000
190 #define BILLION 1000000000L
191
192 static int
ldap_pvt_gettimensec(int * sec)193 ldap_pvt_gettimensec(int *sec)
194 {
195 LARGE_INTEGER count;
196
197 QueryPerformanceCounter( &count );
198
199 /* It shouldn't ever go backwards, but multiple CPUs might
200 * be able to hit in the same tick.
201 */
202 LDAP_MUTEX_LOCK( &ldap_int_gettime_mutex );
203 /* We assume Windows has at least a vague idea of
204 * when a second begins. So we align our nanosecond count
205 * with the Windows millisecond count using this offset.
206 * We retain the submillisecond portion of our own count.
207 *
208 * Note - this also assumes that the relationship between
209 * the PerformanceCounter and SystemTime stays constant;
210 * that assumption breaks if the SystemTime is adjusted by
211 * an external action.
212 */
213 if ( !_ldap_pvt_gt_freq.QuadPart ) {
214 LARGE_INTEGER c2;
215 ULARGE_INTEGER ut;
216 FILETIME ft0, ft1;
217 long long t;
218 int nsec;
219
220 /* Initialize our offset */
221 QueryPerformanceFrequency( &_ldap_pvt_gt_freq );
222
223 /* Wait for a tick of the system time: 10-15ms */
224 GetSystemTimeAsFileTime( &ft0 );
225 do {
226 GetSystemTimeAsFileTime( &ft1 );
227 } while ( ft1.dwLowDateTime == ft0.dwLowDateTime );
228
229 ut.LowPart = ft1.dwLowDateTime;
230 ut.HighPart = ft1.dwHighDateTime;
231 QueryPerformanceCounter( &c2 );
232
233 /* get second and fraction portion of counter */
234 t = c2.QuadPart % (_ldap_pvt_gt_freq.QuadPart*10);
235
236 /* convert to nanoseconds */
237 t *= BILLION;
238 nsec = t / _ldap_pvt_gt_freq.QuadPart;
239
240 ut.QuadPart /= 10;
241 ut.QuadPart %= (10 * BILLION);
242 _ldap_pvt_gt_offset = nsec - ut.QuadPart;
243 count = c2;
244 }
245 if ( count.QuadPart <= _ldap_pvt_gt_prev.QuadPart ) {
246 _ldap_pvt_gt_subs++;
247 } else {
248 _ldap_pvt_gt_subs = 0;
249 _ldap_pvt_gt_prev = count;
250 }
251 LDAP_MUTEX_UNLOCK( &ldap_int_gettime_mutex );
252
253 /* convert to nanoseconds */
254 count.QuadPart %= _ldap_pvt_gt_freq.QuadPart*10;
255 count.QuadPart *= BILLION;
256 count.QuadPart /= _ldap_pvt_gt_freq.QuadPart;
257 count.QuadPart -= _ldap_pvt_gt_offset;
258
259 /* We've extracted the 1s and nanoseconds.
260 * The 1sec digit is used to detect wraparound in nanosecnds.
261 */
262 if (count.QuadPart < 0)
263 count.QuadPart += (10 * BILLION);
264 else if (count.QuadPart >= (10 * BILLION))
265 count.QuadPart -= (10 * BILLION);
266
267 *sec = count.QuadPart / BILLION;
268 return count.QuadPart % BILLION;
269 }
270
271
272 /* emulate POSIX clock_gettime */
273 int
ldap_pvt_clock_gettime(int clk_id,struct timespec * tv)274 ldap_pvt_clock_gettime( int clk_id, struct timespec *tv )
275 {
276 FILETIME ft;
277 ULARGE_INTEGER ut;
278 int sec, sec0;
279
280 GetSystemTimeAsFileTime( &ft );
281 ut.LowPart = ft.dwLowDateTime;
282 ut.HighPart = ft.dwHighDateTime;
283
284 /* convert to sec */
285 ut.QuadPart /= TICKS_PER_SECOND;
286
287 tv->tv_nsec = ldap_pvt_gettimensec(&sec);
288 tv->tv_sec = ut.QuadPart - SEC_TO_UNIX_EPOCH;
289
290 /* check for carry from microseconds */
291 sec0 = tv->tv_sec % 10;
292 if (sec0 < sec || (sec0 == 9 && !sec))
293 tv->tv_sec++;
294
295 return 0;
296 }
297
298 /* emulate POSIX gettimeofday */
299 int
ldap_pvt_gettimeofday(struct timeval * tv,void * unused)300 ldap_pvt_gettimeofday( struct timeval *tv, void *unused )
301 {
302 struct timespec ts;
303 ldap_pvt_clock_gettime( 0, &ts );
304 tv->tv_sec = ts.tv_sec;
305 tv->tv_usec = ts.tv_nsec / 1000;
306 return 0;
307 }
308
309
310 /* return a broken out time, with nanoseconds
311 */
312 void
ldap_pvt_gettime(struct lutil_tm * tm)313 ldap_pvt_gettime( struct lutil_tm *tm )
314 {
315 SYSTEMTIME st;
316 int sec, sec0;
317 static const char daysPerMonth[] = {
318 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
319
320 GetSystemTime( &st );
321 tm->tm_nsec = ldap_pvt_gettimensec(&sec);
322 tm->tm_usub = _ldap_pvt_gt_subs;
323
324 /* any difference larger than nanoseconds is
325 * already reflected in st
326 */
327 tm->tm_sec = st.wSecond;
328 tm->tm_min = st.wMinute;
329 tm->tm_hour = st.wHour;
330 tm->tm_mday = st.wDay;
331 tm->tm_mon = st.wMonth - 1;
332 tm->tm_year = st.wYear - 1900;
333
334 /* check for carry from nanoseconds */
335 sec0 = tm->tm_sec % 10;
336 if (sec0 < sec || (sec0 == 9 && !sec)) {
337 tm->tm_sec++;
338 /* FIXME: we don't handle leap seconds */
339 if (tm->tm_sec > 59) {
340 tm->tm_sec = 0;
341 tm->tm_min++;
342 if (tm->tm_min > 59) {
343 tm->tm_min = 0;
344 tm->tm_hour++;
345 if (tm->tm_hour > 23) {
346 int days = daysPerMonth[tm->tm_mon];
347 tm->tm_hour = 0;
348 tm->tm_mday++;
349
350 /* if it's February of a leap year,
351 * add 1 day to this month
352 */
353 if (tm->tm_mon == 1 &&
354 ((!(st.wYear % 4) && (st.wYear % 100)) ||
355 !(st.wYear % 400)))
356 days++;
357
358 if (tm->tm_mday > days) {
359 tm->tm_mday = 1;
360 tm->tm_mon++;
361 if (tm->tm_mon > 11) {
362 tm->tm_mon = 0;
363 tm->tm_year++;
364 }
365 }
366 }
367 }
368 }
369 }
370 }
371 #else
372
373 #ifdef HAVE_CLOCK_GETTIME
374 static struct timespec _ldap_pvt_gt_prevTv;
375 #else
376 static struct timeval _ldap_pvt_gt_prevTv;
377 #endif
378
379 void
ldap_pvt_gettime(struct lutil_tm * ltm)380 ldap_pvt_gettime( struct lutil_tm *ltm )
381 {
382 struct tm tm;
383 time_t t;
384 #ifdef HAVE_CLOCK_GETTIME
385 #define FRAC tv_nsec
386 #define NSECS(x) x
387 struct timespec tv;
388
389 clock_gettime( CLOCK_REALTIME, &tv );
390 #else
391 #define FRAC tv_usec
392 #define NSECS(x) x * 1000
393 struct timeval tv;
394
395 gettimeofday( &tv, NULL );
396 #endif
397 t = tv.tv_sec;
398
399 LDAP_MUTEX_LOCK( &ldap_int_gettime_mutex );
400 if ( tv.tv_sec < _ldap_pvt_gt_prevTv.tv_sec
401 || ( tv.tv_sec == _ldap_pvt_gt_prevTv.tv_sec
402 && tv.FRAC <= _ldap_pvt_gt_prevTv.FRAC )) {
403 _ldap_pvt_gt_subs++;
404 } else {
405 _ldap_pvt_gt_subs = 0;
406 _ldap_pvt_gt_prevTv = tv;
407 }
408 LDAP_MUTEX_UNLOCK( &ldap_int_gettime_mutex );
409
410 ltm->tm_usub = _ldap_pvt_gt_subs;
411
412 ldap_pvt_gmtime( &t, &tm );
413
414 ltm->tm_sec = tm.tm_sec;
415 ltm->tm_min = tm.tm_min;
416 ltm->tm_hour = tm.tm_hour;
417 ltm->tm_mday = tm.tm_mday;
418 ltm->tm_mon = tm.tm_mon;
419 ltm->tm_year = tm.tm_year;
420 ltm->tm_nsec = NSECS(tv.FRAC);
421 }
422 #endif
423
424 size_t
ldap_pvt_csnstr(char * buf,size_t len,unsigned int replica,unsigned int mod)425 ldap_pvt_csnstr(char *buf, size_t len, unsigned int replica, unsigned int mod)
426 {
427 struct lutil_tm tm;
428 int n;
429
430 ldap_pvt_gettime( &tm );
431
432 n = snprintf( buf, len,
433 "%4d%02d%02d%02d%02d%02d.%06dZ#%06x#%03x#%06x",
434 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour,
435 tm.tm_min, tm.tm_sec, tm.tm_nsec / 1000, tm.tm_usub, replica, mod );
436
437 if( n < 0 ) return 0;
438 return ( (size_t) n < len ) ? n : 0;
439 }
440
441 #define BUFSTART (1024-32)
442 #define BUFMAX (32*1024-32)
443
444 #if defined(LDAP_R_COMPILE)
445 static char *safe_realloc( char **buf, int len );
446
447 #if !(defined(HAVE_GETHOSTBYNAME_R) && defined(HAVE_GETHOSTBYADDR_R))
448 static int copy_hostent( struct hostent *res,
449 char **buf, struct hostent * src );
450 #endif
451 #endif
452
ldap_pvt_gethostbyname_a(const char * name,struct hostent * resbuf,char ** buf,struct hostent ** result,int * herrno_ptr)453 int ldap_pvt_gethostbyname_a(
454 const char *name,
455 struct hostent *resbuf,
456 char **buf,
457 struct hostent **result,
458 int *herrno_ptr )
459 {
460 #if defined( HAVE_GETHOSTBYNAME_R )
461
462 # define NEED_SAFE_REALLOC 1
463 int r=-1;
464 int buflen=BUFSTART;
465 *buf = NULL;
466 for(;buflen<BUFMAX;) {
467 if (safe_realloc( buf, buflen )==NULL)
468 return r;
469
470 #if (GETHOSTBYNAME_R_NARGS < 6)
471 *result=gethostbyname_r( name, resbuf, *buf, buflen, herrno_ptr );
472 r = (*result == NULL) ? -1 : 0;
473 #else
474 while((r = gethostbyname_r( name, resbuf, *buf, buflen, result, herrno_ptr )) == ERANGE) {
475 /* Increase the buffer */
476 buflen*=2;
477 if (safe_realloc(buf, buflen) == NULL)
478 return -1;
479 }
480 #endif
481
482 Debug2( LDAP_DEBUG_TRACE, "ldap_pvt_gethostbyname_a: host=%s, r=%d\n",
483 name, r );
484
485 #ifdef NETDB_INTERNAL
486 if ((r<0) &&
487 (*herrno_ptr==NETDB_INTERNAL) &&
488 (errno==ERANGE))
489 {
490 buflen*=2;
491 continue;
492 }
493 #endif
494 return r;
495 }
496 return -1;
497 #elif defined( LDAP_R_COMPILE )
498 # define NEED_COPY_HOSTENT
499 struct hostent *he;
500 int retval;
501 *buf = NULL;
502
503 LDAP_MUTEX_LOCK( &ldap_int_resolv_mutex );
504
505 he = gethostbyname( name );
506
507 if (he==NULL) {
508 *herrno_ptr = h_errno;
509 retval = -1;
510 } else if (copy_hostent( resbuf, buf, he )<0) {
511 *herrno_ptr = -1;
512 retval = -1;
513 } else {
514 *result = resbuf;
515 retval = 0;
516 }
517
518 LDAP_MUTEX_UNLOCK( &ldap_int_resolv_mutex );
519
520 return retval;
521 #else
522 *buf = NULL;
523 *result = gethostbyname( name );
524
525 if (*result!=NULL) {
526 return 0;
527 }
528
529 *herrno_ptr = h_errno;
530
531 return -1;
532 #endif
533 }
534
535 #if !defined( HAVE_GETNAMEINFO ) && !defined( HAVE_HSTRERROR )
536 static const char *
hp_strerror(int err)537 hp_strerror( int err )
538 {
539 switch (err) {
540 case HOST_NOT_FOUND: return _("Host not found (authoritative)");
541 case TRY_AGAIN: return _("Host not found (server fail?)");
542 case NO_RECOVERY: return _("Non-recoverable failure");
543 case NO_DATA: return _("No data of requested type");
544 #ifdef NETDB_INTERNAL
545 case NETDB_INTERNAL: return STRERROR( errno );
546 #endif
547 }
548 return _("Unknown resolver error");
549 }
550 #endif
551
ldap_pvt_get_hname(const struct sockaddr * sa,int len,char * name,int namelen,char ** err)552 int ldap_pvt_get_hname(
553 const struct sockaddr *sa,
554 int len,
555 char *name,
556 int namelen,
557 char **err )
558 {
559 int rc;
560 #if defined( HAVE_GETNAMEINFO )
561
562 LDAP_MUTEX_LOCK( &ldap_int_resolv_mutex );
563 rc = getnameinfo( sa, len, name, namelen, NULL, 0, 0 );
564 LDAP_MUTEX_UNLOCK( &ldap_int_resolv_mutex );
565 if ( rc ) *err = (char *)AC_GAI_STRERROR( rc );
566 return rc;
567
568 #else /* !HAVE_GETNAMEINFO */
569 char *addr;
570 int alen;
571 struct hostent *hp = NULL;
572 #ifdef HAVE_GETHOSTBYADDR_R
573 struct hostent hb;
574 int buflen=BUFSTART, h_errno;
575 char *buf=NULL;
576 #endif
577
578 #ifdef LDAP_PF_INET6
579 if (sa->sa_family == AF_INET6) {
580 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)sa;
581 addr = (char *)&sin->sin6_addr;
582 alen = sizeof(sin->sin6_addr);
583 } else
584 #endif
585 if (sa->sa_family == AF_INET) {
586 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
587 addr = (char *)&sin->sin_addr;
588 alen = sizeof(sin->sin_addr);
589 } else {
590 rc = NO_RECOVERY;
591 *err = (char *)HSTRERROR( rc );
592 return rc;
593 }
594 #if defined( HAVE_GETHOSTBYADDR_R )
595 for(;buflen<BUFMAX;) {
596 if (safe_realloc( &buf, buflen )==NULL) {
597 *err = (char *)STRERROR( ENOMEM );
598 return ENOMEM;
599 }
600 #if (GETHOSTBYADDR_R_NARGS < 8)
601 hp=gethostbyaddr_r( addr, alen, sa->sa_family,
602 &hb, buf, buflen, &h_errno );
603 rc = (hp == NULL) ? -1 : 0;
604 #else
605 rc = gethostbyaddr_r( addr, alen, sa->sa_family,
606 &hb, buf, buflen,
607 &hp, &h_errno );
608 #endif
609 #ifdef NETDB_INTERNAL
610 if ((rc<0) &&
611 (h_errno==NETDB_INTERNAL) &&
612 (errno==ERANGE))
613 {
614 buflen*=2;
615 continue;
616 }
617 #endif
618 break;
619 }
620 if (hp) {
621 strncpy( name, hp->h_name, namelen );
622 } else {
623 *err = (char *)HSTRERROR( h_errno );
624 }
625 LDAP_FREE(buf);
626 #else /* HAVE_GETHOSTBYADDR_R */
627
628 LDAP_MUTEX_LOCK( &ldap_int_resolv_mutex );
629 hp = gethostbyaddr( addr, alen, sa->sa_family );
630 if (hp) {
631 strncpy( name, hp->h_name, namelen );
632 rc = 0;
633 } else {
634 rc = h_errno;
635 *err = (char *)HSTRERROR( h_errno );
636 }
637 LDAP_MUTEX_UNLOCK( &ldap_int_resolv_mutex );
638
639 #endif /* !HAVE_GETHOSTBYADDR_R */
640 return rc;
641 #endif /* !HAVE_GETNAMEINFO */
642 }
643
ldap_pvt_gethostbyaddr_a(const char * addr,int len,int type,struct hostent * resbuf,char ** buf,struct hostent ** result,int * herrno_ptr)644 int ldap_pvt_gethostbyaddr_a(
645 const char *addr,
646 int len,
647 int type,
648 struct hostent *resbuf,
649 char **buf,
650 struct hostent **result,
651 int *herrno_ptr )
652 {
653 #if defined( HAVE_GETHOSTBYADDR_R )
654
655 # undef NEED_SAFE_REALLOC
656 # define NEED_SAFE_REALLOC
657 int r=-1;
658 int buflen=BUFSTART;
659 *buf = NULL;
660 for(;buflen<BUFMAX;) {
661 if (safe_realloc( buf, buflen )==NULL)
662 return r;
663 #if (GETHOSTBYADDR_R_NARGS < 8)
664 *result=gethostbyaddr_r( addr, len, type,
665 resbuf, *buf, buflen, herrno_ptr );
666 r = (*result == NULL) ? -1 : 0;
667 #else
668 r = gethostbyaddr_r( addr, len, type,
669 resbuf, *buf, buflen,
670 result, herrno_ptr );
671 #endif
672
673 #ifdef NETDB_INTERNAL
674 if ((r<0) &&
675 (*herrno_ptr==NETDB_INTERNAL) &&
676 (errno==ERANGE))
677 {
678 buflen*=2;
679 continue;
680 }
681 #endif
682 return r;
683 }
684 return -1;
685 #elif defined( LDAP_R_COMPILE )
686 # undef NEED_COPY_HOSTENT
687 # define NEED_COPY_HOSTENT
688 struct hostent *he;
689 int retval;
690 *buf = NULL;
691
692 LDAP_MUTEX_LOCK( &ldap_int_resolv_mutex );
693 he = gethostbyaddr( addr, len, type );
694
695 if (he==NULL) {
696 *herrno_ptr = h_errno;
697 retval = -1;
698 } else if (copy_hostent( resbuf, buf, he )<0) {
699 *herrno_ptr = -1;
700 retval = -1;
701 } else {
702 *result = resbuf;
703 retval = 0;
704 }
705 LDAP_MUTEX_UNLOCK( &ldap_int_resolv_mutex );
706
707 return retval;
708
709 #else /* gethostbyaddr() */
710 *buf = NULL;
711 *result = gethostbyaddr( addr, len, type );
712
713 if (*result!=NULL) {
714 return 0;
715 }
716 return -1;
717 #endif
718 }
719 /*
720 * ldap_int_utils_init() should be called before any other function.
721 */
722
ldap_int_utils_init(void)723 void ldap_int_utils_init( void )
724 {
725 static int done=0;
726 if (done)
727 return;
728 done=1;
729
730 #ifdef LDAP_R_COMPILE
731 #if !defined( USE_CTIME_R ) && !defined( HAVE_REENTRANT_FUNCTIONS )
732 ldap_pvt_thread_mutex_init( &ldap_int_ctime_mutex );
733 #endif
734 #if !defined( USE_GMTIME_R ) && !defined( USE_LOCALTIME_R )
735 ldap_pvt_thread_mutex_init( &ldap_int_gmtime_mutex );
736 #endif
737 ldap_pvt_thread_mutex_init( &ldap_int_resolv_mutex );
738
739 ldap_pvt_thread_mutex_init( &ldap_int_hostname_mutex );
740
741 ldap_pvt_thread_mutex_init( &ldap_int_gettime_mutex );
742
743 #endif
744
745 /* call other module init functions here... */
746 }
747
748 #if defined( NEED_COPY_HOSTENT )
749 # undef NEED_SAFE_REALLOC
750 #define NEED_SAFE_REALLOC
751
cpy_aliases(char *** tgtio,char * buf,char ** src)752 static char *cpy_aliases(
753 char ***tgtio,
754 char *buf,
755 char **src )
756 {
757 int len;
758 char **tgt=*tgtio;
759 for( ; (*src) ; src++ ) {
760 len = strlen( *src ) + 1;
761 AC_MEMCPY( buf, *src, len );
762 *tgt++=buf;
763 buf+=len;
764 }
765 *tgtio=tgt;
766 return buf;
767 }
768
cpy_addresses(char *** tgtio,char * buf,char ** src,int len)769 static char *cpy_addresses(
770 char ***tgtio,
771 char *buf,
772 char **src,
773 int len )
774 {
775 char **tgt=*tgtio;
776 for( ; (*src) ; src++ ) {
777 AC_MEMCPY( buf, *src, len );
778 *tgt++=buf;
779 buf+=len;
780 }
781 *tgtio=tgt;
782 return buf;
783 }
784
copy_hostent(struct hostent * res,char ** buf,struct hostent * src)785 static int copy_hostent(
786 struct hostent *res,
787 char **buf,
788 struct hostent * src )
789 {
790 char **p;
791 char **tp;
792 char *tbuf;
793 int name_len;
794 int n_alias=0;
795 int total_alias_len=0;
796 int n_addr=0;
797 int total_addr_len=0;
798 int total_len;
799
800 /* calculate the size needed for the buffer */
801 name_len = strlen( src->h_name ) + 1;
802
803 if( src->h_aliases != NULL ) {
804 for( p = src->h_aliases; (*p) != NULL; p++ ) {
805 total_alias_len += strlen( *p ) + 1;
806 n_alias++;
807 }
808 }
809
810 if( src->h_addr_list != NULL ) {
811 for( p = src->h_addr_list; (*p) != NULL; p++ ) {
812 n_addr++;
813 }
814 total_addr_len = n_addr * src->h_length;
815 }
816
817 total_len = (n_alias + n_addr + 2) * sizeof( char * ) +
818 total_addr_len + total_alias_len + name_len;
819
820 if (safe_realloc( buf, total_len )) {
821 tp = (char **) *buf;
822 tbuf = *buf + (n_alias + n_addr + 2) * sizeof( char * );
823 AC_MEMCPY( res, src, sizeof( struct hostent ) );
824 /* first the name... */
825 AC_MEMCPY( tbuf, src->h_name, name_len );
826 res->h_name = tbuf; tbuf+=name_len;
827 /* now the aliases */
828 res->h_aliases = tp;
829 if ( src->h_aliases != NULL ) {
830 tbuf = cpy_aliases( &tp, tbuf, src->h_aliases );
831 }
832 *tp++=NULL;
833 /* finally the addresses */
834 res->h_addr_list = tp;
835 if ( src->h_addr_list != NULL ) {
836 tbuf = cpy_addresses( &tp, tbuf, src->h_addr_list, src->h_length );
837 }
838 *tp++=NULL;
839 return 0;
840 }
841 return -1;
842 }
843 #endif
844
845 #if defined( NEED_SAFE_REALLOC )
safe_realloc(char ** buf,int len)846 static char *safe_realloc( char **buf, int len )
847 {
848 char *tmpbuf;
849 tmpbuf = LDAP_REALLOC( *buf, len );
850 if (tmpbuf) {
851 *buf=tmpbuf;
852 }
853 return tmpbuf;
854 }
855 #endif
856
ldap_pvt_get_fqdn(char * name)857 char * ldap_pvt_get_fqdn( char *name )
858 {
859 #ifdef HAVE_GETADDRINFO
860 struct addrinfo hints, *res;
861 #else
862 char *ha_buf;
863 struct hostent *hp, he_buf;
864 int local_h_errno;
865 #endif
866 int rc;
867 char *fqdn, hostbuf[MAXHOSTNAMELEN+1];
868
869 if( name == NULL ) {
870 if( gethostname( hostbuf, MAXHOSTNAMELEN ) == 0 ) {
871 hostbuf[MAXHOSTNAMELEN] = '\0';
872 name = hostbuf;
873 } else {
874 name = "localhost";
875 }
876 }
877
878 #ifdef HAVE_GETADDRINFO
879 memset( &hints, 0, sizeof( hints ));
880 hints.ai_family = AF_UNSPEC;
881 hints.ai_flags = AI_CANONNAME;
882
883 LDAP_MUTEX_LOCK( &ldap_int_resolv_mutex );
884 rc = getaddrinfo( name, NULL, &hints, &res );
885 LDAP_MUTEX_UNLOCK( &ldap_int_resolv_mutex );
886 if ( rc == 0 && res->ai_canonname ) {
887 fqdn = LDAP_STRDUP( res->ai_canonname );
888 } else {
889 fqdn = LDAP_STRDUP( name );
890 }
891 if ( rc == 0 )
892 freeaddrinfo( res );
893 #else
894 rc = ldap_pvt_gethostbyname_a( name,
895 &he_buf, &ha_buf, &hp, &local_h_errno );
896
897 if( rc < 0 || hp == NULL || hp->h_name == NULL ) {
898 fqdn = LDAP_STRDUP( name );
899 } else {
900 fqdn = LDAP_STRDUP( hp->h_name );
901 }
902
903 LDAP_FREE( ha_buf );
904 #endif
905 return fqdn;
906 }
907
908 #if ( defined( HAVE_GETADDRINFO ) || defined( HAVE_GETNAMEINFO ) ) \
909 && !defined( HAVE_GAI_STRERROR )
ldap_pvt_gai_strerror(int code)910 char *ldap_pvt_gai_strerror (int code) {
911 static struct {
912 int code;
913 const char *msg;
914 } values[] = {
915 #ifdef EAI_ADDRFAMILY
916 { EAI_ADDRFAMILY, N_("Address family for hostname not supported") },
917 #endif
918 { EAI_AGAIN, N_("Temporary failure in name resolution") },
919 { EAI_BADFLAGS, N_("Bad value for ai_flags") },
920 { EAI_FAIL, N_("Non-recoverable failure in name resolution") },
921 { EAI_FAMILY, N_("ai_family not supported") },
922 { EAI_MEMORY, N_("Memory allocation failure") },
923 #ifdef EAI_NODATA
924 { EAI_NODATA, N_("No address associated with hostname") },
925 #endif
926 { EAI_NONAME, N_("Name or service not known") },
927 { EAI_SERVICE, N_("Servname not supported for ai_socktype") },
928 { EAI_SOCKTYPE, N_("ai_socktype not supported") },
929 #ifdef EAI_SYSTEM
930 { EAI_SYSTEM, N_("System error") },
931 #endif
932 { 0, NULL }
933 };
934
935 int i;
936
937 for ( i = 0; values[i].msg != NULL; i++ ) {
938 if ( values[i].code == code ) {
939 return (char *) _(values[i].msg);
940 }
941 }
942
943 return _("Unknown error");
944 }
945 #endif
946
947 /* format a socket address as a string */
948
949 #ifdef HAVE_TCPD
950 # include <tcpd.h>
951 # define SOCKADDR_STRING_UNKNOWN STRING_UNKNOWN
952 #else /* ! TCP Wrappers */
953 # define SOCKADDR_STRING_UNKNOWN "unknown"
954 #endif /* ! TCP Wrappers */
955
956 void
ldap_pvt_sockaddrstr(Sockaddr * sa,struct berval * addrbuf)957 ldap_pvt_sockaddrstr( Sockaddr *sa, struct berval *addrbuf )
958 {
959 char *addr;
960 switch( sa->sa_addr.sa_family ) {
961 #ifdef LDAP_PF_LOCAL
962 case AF_LOCAL:
963 addrbuf->bv_len = snprintf( addrbuf->bv_val, addrbuf->bv_len,
964 "PATH=%s", sa->sa_un_addr.sun_path );
965 break;
966 #endif
967 #ifdef LDAP_PF_INET6
968 case AF_INET6:
969 strcpy(addrbuf->bv_val, "IP=");
970 if ( IN6_IS_ADDR_V4MAPPED(&sa->sa_in6_addr.sin6_addr) ) {
971 #if defined( HAVE_GETADDRINFO ) && defined( HAVE_INET_NTOP )
972 addr = (char *)inet_ntop( AF_INET,
973 ((struct in_addr *)&sa->sa_in6_addr.sin6_addr.s6_addr[12]),
974 addrbuf->bv_val+3, addrbuf->bv_len-3 );
975 #else /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
976 addr = inet_ntoa( *((struct in_addr *)
977 &sa->sa_in6_addr.sin6_addr.s6_addr[12]) );
978 #endif /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
979 if ( !addr ) addr = SOCKADDR_STRING_UNKNOWN;
980 if ( addr != addrbuf->bv_val+3 ) {
981 addrbuf->bv_len = sprintf( addrbuf->bv_val+3, "%s:%d", addr,
982 (unsigned) ntohs( sa->sa_in6_addr.sin6_port ) ) + 3;
983 } else {
984 int len = strlen( addr );
985 addrbuf->bv_len = sprintf( addr+len, ":%d",
986 (unsigned) ntohs( sa->sa_in6_addr.sin6_port ) ) + len + 3;
987 }
988 } else {
989 addr = (char *)inet_ntop( AF_INET6,
990 &sa->sa_in6_addr.sin6_addr,
991 addrbuf->bv_val+4, addrbuf->bv_len-4 );
992 if ( !addr ) addr = SOCKADDR_STRING_UNKNOWN;
993 if ( addr != addrbuf->bv_val+4 ) {
994 addrbuf->bv_len = sprintf( addrbuf->bv_val+3, "[%s]:%d", addr,
995 (unsigned) ntohs( sa->sa_in6_addr.sin6_port ) ) + 3;
996 } else {
997 int len = strlen( addr );
998 addrbuf->bv_val[3] = '[';
999 addrbuf->bv_len = sprintf( addr+len, "]:%d",
1000 (unsigned) ntohs( sa->sa_in6_addr.sin6_port ) ) + len + 4;
1001 }
1002 }
1003 break;
1004 #endif /* LDAP_PF_INET6 */
1005 case AF_INET:
1006 strcpy(addrbuf->bv_val, "IP=");
1007 #if defined( HAVE_GETADDRINFO ) && defined( HAVE_INET_NTOP )
1008 addr = (char *)inet_ntop( AF_INET, &sa->sa_in_addr.sin_addr,
1009 addrbuf->bv_val+3, addrbuf->bv_len-3 );
1010 #else /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
1011 addr = inet_ntoa( sa->sa_in_addr.sin_addr );
1012 #endif /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
1013 if ( !addr ) addr = SOCKADDR_STRING_UNKNOWN;
1014 if ( addr != addrbuf->bv_val+3 ) {
1015 addrbuf->bv_len = sprintf( addrbuf->bv_val+3, "%s:%d", addr,
1016 (unsigned) ntohs( sa->sa_in_addr.sin_port ) ) + 3;
1017 } else {
1018 int len = strlen( addr );
1019 addrbuf->bv_len = sprintf( addr+len, ":%d",
1020 (unsigned) ntohs( sa->sa_in_addr.sin_port ) ) + len + 3;
1021 }
1022 break;
1023 default:
1024 addrbuf->bv_val[0] = '\0';
1025 }
1026 }
1027