1 /*
2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 #include <errno.h>
27 #include <sys/time.h>
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <netinet/in.h>
31 #include <netdb.h>
32 #include <string.h>
33 #include <strings.h>
34 #include <stdlib.h>
35 #include <ctype.h>
36 #ifdef MACOSX
37 #include <ifaddrs.h>
38 #include <net/if.h>
39 #include <unistd.h> /* gethostname */
40 #endif
41
42 #include "jvm.h"
43 #include "jni_util.h"
44 #include "net_util.h"
45 #ifndef IPV6_DEFS_H
46 #include <netinet/icmp6.h>
47 #endif
48
49 #include "java_net_Inet4AddressImpl.h"
50 #include "java_net_Inet6AddressImpl.h"
51
52 /* the initial size of our hostent buffers */
53 #ifndef NI_MAXHOST
54 #define NI_MAXHOST 1025
55 #endif
56
57
58 /************************************************************************
59 * Inet6AddressImpl
60 */
61
62 /*
63 * Class: java_net_Inet6AddressImpl
64 * Method: getLocalHostName
65 * Signature: ()Ljava/lang/String;
66 */
67 JNIEXPORT jstring JNICALL
68 Java_java_net_Inet6AddressImpl_getLocalHostName(JNIEnv *env, jobject this) {
69 char hostname[NI_MAXHOST+1];
70
71 hostname[0] = '\0';
72 if (JVM_GetHostName(hostname, sizeof(hostname))) {
73 /* Something went wrong, maybe networking is not setup? */
74 strcpy(hostname, "localhost");
75 } else {
76 // ensure null-terminated
77 hostname[NI_MAXHOST] = '\0';
78 #if defined(__linux__) || defined(_ALLBSD_SOURCE)
79 /* On Linux/FreeBSD gethostname() says "host.domain.sun.com". On
80 * Solaris gethostname() says "host", so extra work is needed.
81 */
82 #else
83 /* Solaris doesn't want to give us a fully qualified domain name.
84 * We do a reverse lookup to try and get one. This works
85 * if DNS occurs before NIS in /etc/resolv.conf, but fails
86 * if NIS comes first (it still gets only a partial name).
87 * We use thread-safe system calls.
88 */
89 #ifdef AF_INET6
90 struct addrinfo hints, *res;
91 int error;
92
93 memset(&hints, 0, sizeof(hints));
94 hints.ai_flags = AI_CANONNAME;
95 hints.ai_family = AF_UNSPEC;
96
97 error = getaddrinfo(hostname, NULL, &hints, &res);
98
99 if (error == 0) {
100 /* host is known to name service */
101 error = getnameinfo(res->ai_addr,
102 res->ai_addrlen,
103 hostname,
104 NI_MAXHOST,
105 NULL,
106 0,
107 NI_NAMEREQD);
108
109 /* if getnameinfo fails hostname is still the value
110 from gethostname */
111
112 freeaddrinfo(res);
113 }
114 #endif /* AF_INET6 */
115 #endif /* __linux__ || _ALLBSD_SOURCE */
116 }
117 return (*env)->NewStringUTF(env, hostname);
118 }
119
120 static jclass ni_iacls;
121 static jclass ni_ia4cls;
122 static jclass ni_ia6cls;
123 static jmethodID ni_ia4ctrID;
124 static jmethodID ni_ia6ctrID;
125 static jboolean preferIPv6Address;
126
127 static jboolean initializeInetClasses(JNIEnv *env)
128 {
129 jfieldID ni_preferIPv6AddressID;
130 static int initialized = 0;
131 if (!initialized) {
132 ni_iacls = (*env)->FindClass(env, "java/net/InetAddress");
133 CHECK_NULL_RETURN(ni_iacls, JNI_FALSE);
134 ni_iacls = (*env)->NewGlobalRef(env, ni_iacls);
135 CHECK_NULL_RETURN(ni_iacls, JNI_FALSE);
136 ni_ia4cls = (*env)->FindClass(env, "java/net/Inet4Address");
137 CHECK_NULL_RETURN(ni_ia4cls, JNI_FALSE);
138 ni_ia4cls = (*env)->NewGlobalRef(env, ni_ia4cls);
139 CHECK_NULL_RETURN(ni_ia4cls, JNI_FALSE);
140 ni_ia6cls = (*env)->FindClass(env, "java/net/Inet6Address");
141 CHECK_NULL_RETURN(ni_ia6cls, JNI_FALSE);
142 ni_ia6cls = (*env)->NewGlobalRef(env, ni_ia6cls);
143 CHECK_NULL_RETURN(ni_ia6cls, JNI_FALSE);
144 ni_ia4ctrID = (*env)->GetMethodID(env, ni_ia4cls, "<init>", "()V");
145 CHECK_NULL_RETURN(ni_ia4ctrID, JNI_FALSE);
146 ni_ia6ctrID = (*env)->GetMethodID(env, ni_ia6cls, "<init>", "()V");
147 CHECK_NULL_RETURN(ni_ia6ctrID, JNI_FALSE);
148 ni_preferIPv6AddressID =
149 (*env)->GetStaticFieldID(env, ni_iacls, "preferIPv6Address", "Z");
150 CHECK_NULL_RETURN(ni_preferIPv6AddressID, JNI_FALSE);
151 preferIPv6Address =
152 (*env)->GetStaticBooleanField(env, ia_class, ia_preferIPv6AddressID);
153 initialized = 1;
154 }
155 return JNI_TRUE;
156 }
157
158 #ifdef MACOSX
159 /* also called from Inet4AddressImpl.c */
160 __private_extern__ jobjectArray
161 lookupIfLocalhost(JNIEnv *env, const char *hostname, jboolean includeV6)
162 {
163 jobjectArray result = NULL;
164 char myhostname[NI_MAXHOST+1];
165 struct ifaddrs *ifa = NULL;
166 int familyOrder = 0;
167 int count = 0, i, j;
168 int addrs4 = 0, addrs6 = 0, numV4Loopbacks = 0, numV6Loopbacks = 0;
169 jboolean includeLoopback = JNI_FALSE;
170 jobject name;
171
172 // Make sure static variables we need are set.
173 if (!initializeInetClasses(env))
174 return NULL;
175
176 /* If the requested name matches this host's hostname, return IP addresses
177 * from all attached interfaces. (#2844683 et al) This prevents undesired
178 * PPP dialup, but may return addresses that don't actually correspond to
179 * the name (if the name actually matches something in DNS etc.
180 */
181 myhostname[0] = '\0';
182 if (JVM_GetHostName(myhostname, NI_MAXHOST)) {
183 /* Something went wrong, maybe networking is not setup? */
184 return NULL;
185 }
186 myhostname[NI_MAXHOST] = '\0';
187
188 if (strcmp(myhostname, hostname) != 0) {
189 // Non-self lookup
190 return NULL;
191 }
192
193 if (getifaddrs(&ifa) != 0) {
194 NET_ThrowNew(env, errno, "Can't get local interface addresses");
195 return NULL;
196 }
197
198 name = (*env)->NewStringUTF(env, hostname);
199 CHECK_NULL_RETURN(name);
200
201 /* Iterate over the interfaces, and total up the number of IPv4 and IPv6
202 * addresses we have. Also keep a count of loopback addresses. We need to
203 * exclude them in the normal case, but return them if we don't get an IP
204 * address.
205 */
206 struct ifaddrs *iter = ifa;
207 while (iter) {
208 int family = iter->ifa_addr->sa_family;
209 if (iter->ifa_name[0] != '\0' && iter->ifa_addr)
210 {
211 jboolean isLoopback = iter->ifa_flags & IFF_LOOPBACK;
212 if (family == AF_INET) {
213 addrs4++;
214 if (isLoopback) numV4Loopbacks++;
215 } else if (family == AF_INET6 && includeV6) {
216 addrs6++;
217 if (isLoopback) numV6Loopbacks++;
218 } else {
219 /* We don't care e.g. AF_LINK */
220 }
221 }
222 iter = iter->ifa_next;
223 }
224
225 if (addrs4 == numV4Loopbacks && addrs6 == numV6Loopbacks) {
226 // We don't have a real IP address, just loopback. We need to include
227 // loopback in our results.
228 includeLoopback = JNI_TRUE;
229 }
230
231 /* Create and fill the Java array. */
232 int arraySize = addrs4 + addrs6 -
233 (includeLoopback ? 0 : (numV4Loopbacks + numV6Loopbacks));
234 result = (*env)->NewObjectArray(env, arraySize, ni_iacls, NULL);
235 if (!result) goto done;
236
237 if (preferIPv6Address) {
238 i = includeLoopback ? addrs6 : (addrs6 - numV6Loopbacks);
239 j = 0;
240 } else {
241 i = 0;
242 j = includeLoopback ? addrs4 : (addrs4 - numV4Loopbacks);
243 }
244
245 // Now loop around the ifaddrs
246 iter = ifa;
247 while (iter != NULL) {
248 jboolean isLoopback = iter->ifa_flags & IFF_LOOPBACK;
249 int family = iter->ifa_addr->sa_family;
250
251 if (iter->ifa_name[0] != '\0' && iter->ifa_addr
252 && (family == AF_INET || (family == AF_INET6 && includeV6))
253 && (!isLoopback || includeLoopback))
254 {
255 int port;
256 int index = (family == AF_INET) ? i++ : j++;
257 jobject o = NET_SockaddrToInetAddress(env, iter->ifa_addr, &port);
258 if (!o) {
259 freeifaddrs(ifa);
260 if (!(*env)->ExceptionCheck(env))
261 JNU_ThrowOutOfMemoryError(env, "Object allocation failed");
262 return NULL;
263 }
264 setInetAddress_hostName(env, o, name);
265 (*env)->SetObjectArrayElement(env, result, index, o);
266 (*env)->DeleteLocalRef(env, o);
267 }
268 iter = iter->ifa_next;
269 }
270
271 done:
272 freeifaddrs(ifa);
273
274 return result;
275 }
276 #endif
277
278 /*
279 * Find an internet address for a given hostname. Note that this
280 * code only works for addresses of type INET. The translation
281 * of %d.%d.%d.%d to an address (int) occurs in java now, so the
282 * String "host" shouldn't *ever* be a %d.%d.%d.%d string
283 *
284 * Class: java_net_Inet6AddressImpl
285 * Method: lookupAllHostAddr
286 * Signature: (Ljava/lang/String;)[[B
287 */
288
289 JNIEXPORT jobjectArray JNICALL
290 Java_java_net_Inet6AddressImpl_lookupAllHostAddr(JNIEnv *env, jobject this,
291 jstring host) {
292 const char *hostname;
293 jobjectArray ret = 0;
294 int retLen = 0;
295
296 int error=0;
297 #ifdef AF_INET6
298 struct addrinfo hints, *res, *resNew = NULL;
299 #endif /* AF_INET6 */
300
301 if (!initializeInetClasses(env))
302 return NULL;
303
304 if (IS_NULL(host)) {
305 JNU_ThrowNullPointerException(env, "host is null");
306 return 0;
307 }
308 hostname = JNU_GetStringPlatformChars(env, host, JNI_FALSE);
309 CHECK_NULL_RETURN(hostname, NULL);
310
311 #ifdef MACOSX
312 /*
313 * If we're looking up the local machine, attempt to get the address
314 * from getifaddrs. This ensures we get an IPv6 address for the local
315 * machine.
316 */
317 ret = lookupIfLocalhost(env, hostname, JNI_TRUE);
318 if (ret != NULL || (*env)->ExceptionCheck(env)) {
319 JNU_ReleaseStringPlatformChars(env, host, hostname);
320 return ret;
321 }
322 #endif
323
324 #ifdef AF_INET6
325 /* Try once, with our static buffer. */
326 memset(&hints, 0, sizeof(hints));
327 hints.ai_flags = AI_CANONNAME;
328 hints.ai_family = AF_UNSPEC;
329
330 #ifdef __solaris__
331 /*
332 * Workaround for Solaris bug 4160367 - if a hostname contains a
333 * white space then 0.0.0.0 is returned
334 */
335 if (isspace((unsigned char)hostname[0])) {
336 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException",
337 hostname);
338 JNU_ReleaseStringPlatformChars(env, host, hostname);
339 return NULL;
340 }
341 #endif
342
343 error = getaddrinfo(hostname, NULL, &hints, &res);
344
345 if (error) {
346 /* report error */
347 ThrowUnknownHostExceptionWithGaiError(env, hostname, error);
348 JNU_ReleaseStringPlatformChars(env, host, hostname);
349 return NULL;
350 } else {
351 int i = 0;
352 int inetCount = 0, inet6Count = 0, inetIndex, inet6Index;
353 struct addrinfo *itr, *last = NULL, *iterator = res;
354 while (iterator != NULL) {
355 int skip = 0;
356 itr = resNew;
357 while (itr != NULL) {
358 if (iterator->ai_family == itr->ai_family &&
359 iterator->ai_addrlen == itr->ai_addrlen) {
360 if (itr->ai_family == AF_INET) { /* AF_INET */
361 struct sockaddr_in *addr1, *addr2;
362 addr1 = (struct sockaddr_in *)iterator->ai_addr;
363 addr2 = (struct sockaddr_in *)itr->ai_addr;
364 if (addr1->sin_addr.s_addr ==
365 addr2->sin_addr.s_addr) {
366 skip = 1;
367 break;
368 }
369 } else {
370 int t;
371 struct sockaddr_in6 *addr1, *addr2;
372 addr1 = (struct sockaddr_in6 *)iterator->ai_addr;
373 addr2 = (struct sockaddr_in6 *)itr->ai_addr;
374
375 for (t = 0; t < 16; t++) {
376 if (addr1->sin6_addr.s6_addr[t] !=
377 addr2->sin6_addr.s6_addr[t]) {
378 break;
379 }
380 }
381 if (t < 16) {
382 itr = itr->ai_next;
383 continue;
384 } else {
385 skip = 1;
386 break;
387 }
388 }
389 } else if (iterator->ai_family != AF_INET &&
390 iterator->ai_family != AF_INET6) {
391 /* we can't handle other family types */
392 skip = 1;
393 break;
394 }
395 itr = itr->ai_next;
396 }
397
398 if (!skip) {
399 struct addrinfo *next
400 = (struct addrinfo*) malloc(sizeof(struct addrinfo));
401 if (!next) {
402 JNU_ThrowOutOfMemoryError(env, "Native heap allocation failed");
403 ret = NULL;
404 goto cleanupAndReturn;
405 }
406 memcpy(next, iterator, sizeof(struct addrinfo));
407 next->ai_next = NULL;
408 if (resNew == NULL) {
409 resNew = next;
410 } else {
411 last->ai_next = next;
412 }
413 last = next;
414 i++;
415 if (iterator->ai_family == AF_INET) {
416 inetCount ++;
417 } else if (iterator->ai_family == AF_INET6) {
418 inet6Count ++;
419 }
420 }
421 iterator = iterator->ai_next;
422 }
423 retLen = i;
424 iterator = resNew;
425
426 ret = (*env)->NewObjectArray(env, retLen, ni_iacls, NULL);
427
428 if (IS_NULL(ret)) {
429 /* we may have memory to free at the end of this */
430 goto cleanupAndReturn;
431 }
432
433 if (preferIPv6Address) {
434 /* AF_INET addresses will be offset by inet6Count */
435 inetIndex = inet6Count;
436 inet6Index = 0;
437 } else {
438 /* AF_INET6 addresses will be offset by inetCount */
439 inetIndex = 0;
440 inet6Index = inetCount;
441 }
442
443 while (iterator != NULL) {
444 int ret1;
445 if (iterator->ai_family == AF_INET) {
446 jobject iaObj = (*env)->NewObject(env, ni_ia4cls, ni_ia4ctrID);
447 if (IS_NULL(iaObj)) {
448 ret = NULL;
449 goto cleanupAndReturn;
450 }
451 setInetAddress_addr(env, iaObj, ntohl(((struct sockaddr_in*)iterator->ai_addr)->sin_addr.s_addr));
452 setInetAddress_hostName(env, iaObj, host);
453 (*env)->SetObjectArrayElement(env, ret, inetIndex, iaObj);
454 inetIndex++;
455 } else if (iterator->ai_family == AF_INET6) {
456 jint scope = 0;
457
458 jobject iaObj = (*env)->NewObject(env, ni_ia6cls, ni_ia6ctrID);
459 if (IS_NULL(iaObj)) {
460 ret = NULL;
461 goto cleanupAndReturn;
462 }
463 ret1 = setInet6Address_ipaddress(env, iaObj, (char *)&(((struct sockaddr_in6*)iterator->ai_addr)->sin6_addr));
464 if (!ret1) {
465 ret = NULL;
466 goto cleanupAndReturn;
467 }
468
469 scope = ((struct sockaddr_in6*)iterator->ai_addr)->sin6_scope_id;
470 if (scope != 0) { /* zero is default value, no need to set */
471 setInet6Address_scopeid(env, iaObj, scope);
472 }
473 setInetAddress_hostName(env, iaObj, host);
474 (*env)->SetObjectArrayElement(env, ret, inet6Index, iaObj);
475 inet6Index++;
476 }
477 iterator = iterator->ai_next;
478 }
479 }
480
481 cleanupAndReturn:
482 {
483 struct addrinfo *iterator, *tmp;
484 iterator = resNew;
485 while (iterator != NULL) {
486 tmp = iterator;
487 iterator = iterator->ai_next;
488 free(tmp);
489 }
490 JNU_ReleaseStringPlatformChars(env, host, hostname);
491 }
492
493 freeaddrinfo(res);
494 #endif /* AF_INET6 */
495
496 return ret;
497 }
498
499 /*
500 * Class: java_net_Inet6AddressImpl
501 * Method: getHostByAddr
502 * Signature: (I)Ljava/lang/String;
503 */
504 JNIEXPORT jstring JNICALL
505 Java_java_net_Inet6AddressImpl_getHostByAddr(JNIEnv *env, jobject this,
506 jbyteArray addrArray) {
507
508 jstring ret = NULL;
509
510 #ifdef AF_INET6
511 char host[NI_MAXHOST+1];
512 int error = 0;
513 int len = 0;
514 jbyte caddr[16];
515
516 struct sockaddr_in him4;
517 struct sockaddr_in6 him6;
518 struct sockaddr *sa;
519
520 /*
521 * For IPv4 addresses construct a sockaddr_in structure.
522 */
523 if ((*env)->GetArrayLength(env, addrArray) == 4) {
524 jint addr;
525 (*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr);
526 addr = ((caddr[0]<<24) & 0xff000000);
527 addr |= ((caddr[1] <<16) & 0xff0000);
528 addr |= ((caddr[2] <<8) & 0xff00);
529 addr |= (caddr[3] & 0xff);
530 memset((void *) &him4, 0, sizeof(him4));
531 him4.sin_addr.s_addr = (uint32_t) htonl(addr);
532 him4.sin_family = AF_INET;
533 sa = (struct sockaddr *) &him4;
534 len = sizeof(him4);
535 } else {
536 /*
537 * For IPv6 address construct a sockaddr_in6 structure.
538 */
539 (*env)->GetByteArrayRegion(env, addrArray, 0, 16, caddr);
540 memset((void *) &him6, 0, sizeof(him6));
541 memcpy((void *)&(him6.sin6_addr), caddr, sizeof(struct in6_addr) );
542 him6.sin6_family = AF_INET6;
543 sa = (struct sockaddr *) &him6 ;
544 len = sizeof(him6) ;
545 }
546
547 error = getnameinfo(sa, len, host, NI_MAXHOST, NULL, 0,
548 NI_NAMEREQD);
549
550 if (!error) {
551 ret = (*env)->NewStringUTF(env, host);
552 }
553 #endif /* AF_INET6 */
554
555 if (ret == NULL) {
556 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", NULL);
557 }
558
559 return ret;
560 }
561
562 #define SET_NONBLOCKING(fd) { \
563 int flags = fcntl(fd, F_GETFL); \
564 flags |= O_NONBLOCK; \
565 fcntl(fd, F_SETFL, flags); \
566 }
567
568 #ifdef AF_INET6
569 static jboolean
570 ping6(JNIEnv *env, jint fd, struct sockaddr_in6* him, jint timeout,
571 struct sockaddr_in6* netif, jint ttl) {
572 jint size;
573 jint n;
574 socklen_t len;
575 char sendbuf[1500];
576 unsigned char recvbuf[1500];
577 struct icmp6_hdr *icmp6;
578 struct sockaddr_in6 sa_recv;
579 jbyte *caddr, *recv_caddr;
580 jchar pid;
581 jint tmout2, seq = 1;
582 struct timeval tv;
583 size_t plen;
584
585 #ifdef __linux__
586 {
587 int csum_offset;
588 /**
589 * For some strange reason, the linux kernel won't calculate the
590 * checksum of ICMPv6 packets unless you set this socket option
591 */
592 csum_offset = 2;
593 setsockopt(fd, SOL_RAW, IPV6_CHECKSUM, &csum_offset, sizeof(int));
594 }
595 #endif
596
597 caddr = (jbyte *)&(him->sin6_addr);
598
599 /* icmp_id is a 16 bit data type, therefore down cast the pid */
600 pid = (jchar)getpid();
601 size = 60*1024;
602 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size));
603 if (ttl > 0) {
604 setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
605 }
606 if (netif != NULL) {
607 if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in6)) <0) {
608 NET_ThrowNew(env, errno, "Can't bind socket");
609 close(fd);
610 return JNI_FALSE;
611 }
612 }
613 SET_NONBLOCKING(fd);
614
615 do {
616 icmp6 = (struct icmp6_hdr *) sendbuf;
617 icmp6->icmp6_type = ICMP6_ECHO_REQUEST;
618 icmp6->icmp6_code = 0;
619 /* let's tag the ECHO packet with our pid so we can identify it */
620 icmp6->icmp6_id = htons(pid);
621 icmp6->icmp6_seq = htons(seq);
622 seq++;
623 icmp6->icmp6_cksum = 0;
624 gettimeofday(&tv, NULL);
625 memcpy(sendbuf + sizeof(struct icmp6_hdr), &tv, sizeof(tv));
626 plen = sizeof(struct icmp6_hdr) + sizeof(tv);
627 n = sendto(fd, sendbuf, plen, 0, (struct sockaddr*) him, sizeof(struct sockaddr_in6));
628 if (n < 0 && errno != EINPROGRESS) {
629 #ifdef __linux__
630 if (errno != EINVAL && errno != EHOSTUNREACH)
631 /*
632 * On some Linux versions, when a socket is bound to the
633 * loopback interface, sendto will fail and errno will be
634 * set to EINVAL or EHOSTUNREACH.
635 * When that happens, don't throw an exception, just return false.
636 */
637 #endif /*__linux__ */
638 NET_ThrowNew(env, errno, "Can't send ICMP packet");
639 close(fd);
640 return JNI_FALSE;
641 }
642
643 tmout2 = timeout > 1000 ? 1000 : timeout;
644 do {
645 tmout2 = NET_Wait(env, fd, NET_WAIT_READ, tmout2);
646
647 if (tmout2 >= 0) {
648 len = sizeof(sa_recv);
649 n = recvfrom(fd, recvbuf, sizeof(recvbuf), 0, (struct sockaddr*) &sa_recv, &len);
650 icmp6 = (struct icmp6_hdr *) (recvbuf);
651 recv_caddr = (jbyte *)&(sa_recv.sin6_addr);
652 /*
653 * We did receive something, but is it what we were expecting?
654 * I.E.: An ICMP6_ECHO_REPLY packet with the proper PID and
655 * from the host that we are trying to determine is reachable.
656 */
657 if (n >= 8 && icmp6->icmp6_type == ICMP6_ECHO_REPLY &&
658 (ntohs(icmp6->icmp6_id) == pid)) {
659 if (NET_IsEqual(caddr, recv_caddr)) {
660 close(fd);
661 return JNI_TRUE;
662 }
663 if (NET_IsZeroAddr(caddr)) {
664 close(fd);
665 return JNI_TRUE;
666 }
667 }
668 }
669 } while (tmout2 > 0);
670 timeout -= 1000;
671 } while (timeout > 0);
672 close(fd);
673 return JNI_FALSE;
674 }
675 #endif /* AF_INET6 */
676
677 /*
678 * Class: java_net_Inet6AddressImpl
679 * Method: isReachable0
680 * Signature: ([bII[bI)Z
681 */
682 JNIEXPORT jboolean JNICALL
683 Java_java_net_Inet6AddressImpl_isReachable0(JNIEnv *env, jobject this,
684 jbyteArray addrArray,
685 jint scope,
686 jint timeout,
687 jbyteArray ifArray,
688 jint ttl, jint if_scope) {
689 #ifdef AF_INET6
690 jbyte caddr[16];
691 jint fd, sz;
692 struct sockaddr_in6 him6;
693 struct sockaddr_in6 inf6;
694 struct sockaddr_in6* netif = NULL;
695 int len = 0;
696 int connect_rv = -1;
697
698 /*
699 * If IPv6 is not enable, then we can't reach an IPv6 address, can we?
700 */
701 if (!ipv6_available()) {
702 return JNI_FALSE;
703 }
704 /*
705 * If it's an IPv4 address, ICMP won't work with IPv4 mapped address,
706 * therefore, let's delegate to the Inet4Address method.
707 */
708 sz = (*env)->GetArrayLength(env, addrArray);
709 if (sz == 4) {
710 return Java_java_net_Inet4AddressImpl_isReachable0(env, this,
711 addrArray,
712 timeout,
713 ifArray, ttl);
714 }
715
716 memset((void *) caddr, 0, 16);
717 memset((void *) &him6, 0, sizeof(him6));
718 (*env)->GetByteArrayRegion(env, addrArray, 0, 16, caddr);
719 memcpy((void *)&(him6.sin6_addr), caddr, sizeof(struct in6_addr) );
720 him6.sin6_family = AF_INET6;
721 #ifdef __linux__
722 if (scope > 0)
723 him6.sin6_scope_id = scope;
724 else
725 him6.sin6_scope_id = getDefaultIPv6Interface( &(him6.sin6_addr));
726 len = sizeof(struct sockaddr_in6);
727 #else
728 if (scope > 0)
729 him6.sin6_scope_id = scope;
730 len = sizeof(struct sockaddr_in6);
731 #endif
732 /*
733 * If a network interface was specified, let's create the address
734 * for it.
735 */
736 if (!(IS_NULL(ifArray))) {
737 memset((void *) caddr, 0, 16);
738 memset((void *) &inf6, 0, sizeof(inf6));
739 (*env)->GetByteArrayRegion(env, ifArray, 0, 16, caddr);
740 memcpy((void *)&(inf6.sin6_addr), caddr, sizeof(struct in6_addr) );
741 inf6.sin6_family = AF_INET6;
742 inf6.sin6_scope_id = if_scope;
743 netif = &inf6;
744 }
745 /*
746 * If we can create a RAW socket, then when can use the ICMP ECHO_REQUEST
747 * otherwise we'll try a tcp socket to the Echo port (7).
748 * Note that this is empiric, and not connecting could mean it's blocked
749 * or the echo service has been disabled.
750 */
751
752 fd = JVM_Socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
753
754 if (fd != -1) { /* Good to go, let's do a ping */
755 return ping6(env, fd, &him6, timeout, netif, ttl);
756 }
757
758 /* No good, let's fall back on TCP */
759 fd = JVM_Socket(AF_INET6, SOCK_STREAM, 0);
760 if (fd == JVM_IO_ERR) {
761 /* note: if you run out of fds, you may not be able to load
762 * the exception class, and get a NoClassDefFoundError
763 * instead.
764 */
765 NET_ThrowNew(env, errno, "Can't create socket");
766 return JNI_FALSE;
767 }
768 if (ttl > 0) {
769 setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
770 }
771
772 /*
773 * A network interface was specified, so let's bind to it.
774 */
775 if (netif != NULL) {
776 if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in6)) <0) {
777 NET_ThrowNew(env, errno, "Can't bind socket");
778 close(fd);
779 return JNI_FALSE;
780 }
781 }
782 SET_NONBLOCKING(fd);
783
784 /* no need to use NET_Connect as non-blocking */
785 him6.sin6_port = htons((short) 7); /* Echo port */
786 connect_rv = JVM_Connect(fd, (struct sockaddr *)&him6, len);
787
788 /**
789 * connection established or refused immediately, either way it means
790 * we were able to reach the host!
791 */
792 if (connect_rv == 0 || errno == ECONNREFUSED) {
793 close(fd);
794 return JNI_TRUE;
795 } else {
796 int optlen;
797
798 switch (errno) {
799 case ENETUNREACH: /* Network Unreachable */
800 case EAFNOSUPPORT: /* Address Family not supported */
801 case EADDRNOTAVAIL: /* address is not available on the remote machine */
802 #ifdef __linux__
803 case EINVAL:
804 case EHOSTUNREACH:
805 /*
806 * On some Linux versions, when a socket is bound to the
807 * loopback interface, connect will fail and errno will
808 * be set to EINVAL or EHOSTUNREACH. When that happens,
809 * don't throw an exception, just return false.
810 */
811 #endif /* __linux__ */
812 close(fd);
813 return JNI_FALSE;
814 }
815
816 if (errno != EINPROGRESS) {
817 NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "ConnectException",
818 "connect failed");
819 close(fd);
820 return JNI_FALSE;
821 }
822
823 timeout = NET_Wait(env, fd, NET_WAIT_CONNECT, timeout);
824
825 if (timeout >= 0) {
826 /* has connection been established */
827 optlen = sizeof(connect_rv);
828 if (JVM_GetSockOpt(fd, SOL_SOCKET, SO_ERROR, (void*)&connect_rv,
829 &optlen) <0) {
830 connect_rv = errno;
831 }
832 if (connect_rv == 0 || ECONNREFUSED) {
833 close(fd);
834 return JNI_TRUE;
835 }
836 }
837 close(fd);
838 return JNI_FALSE;
839 }
840 #else /* AF_INET6 */
841 return JNI_FALSE;
842 #endif /* AF_INET6 */
843 }