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src/java.base/unix/native/libnet/Inet6AddressImpl.c

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  1 /*
  2  * Copyright (c) 2000, 2020, 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

 24  */
 25 #include <ctype.h>
 26 #include <errno.h>
 27 #include <stdlib.h>
 28 #include <string.h>
 29 #include <sys/time.h>
 30 #include <sys/types.h>
 31 #include <netinet/in.h>
 32 #include <netinet/icmp6.h>
 33 
 34 #if defined(_ALLBSD_SOURCE)
 35 #include <ifaddrs.h>
 36 #include <net/if.h>
 37 #endif
 38 
 39 #include "net_util.h"
 40 
 41 #include "java_net_InetAddress.h"
 42 #include "java_net_Inet4AddressImpl.h"
 43 #include "java_net_Inet6AddressImpl.h"


 44 
 45 #define SET_NONBLOCKING(fd) {       \
 46     int flags = fcntl(fd, F_GETFL); \
 47     flags |= O_NONBLOCK;            \
 48     fcntl(fd, F_SETFL, flags);      \
 49 }
 50 
 51 /*
 52  * Inet6AddressImpl
 53  */
 54 
 55 /*
 56  * Class:     java_net_Inet6AddressImpl
 57  * Method:    getLocalHostName
 58  * Signature: ()Ljava/lang/String;
 59  */
 60 JNIEXPORT jstring JNICALL
 61 Java_java_net_Inet6AddressImpl_getLocalHostName(JNIEnv *env, jobject this) {
 62     char hostname[NI_MAXHOST + 1];
 63 
 64     hostname[0] = '\0';
 65     if (gethostname(hostname, sizeof(hostname)) != 0) {
 66         strcpy(hostname, "localhost");
 67     } else {
 68         // make sure string is null-terminated
 69         hostname[NI_MAXHOST] = '\0';
 70     }
 71     return (*env)->NewStringUTF(env, hostname);
 72 }
 73 
 74 #if defined(MACOSX)
 75 /* also called from Inet4AddressImpl.c */
 76 __private_extern__ jobjectArray
 77 lookupIfLocalhost(JNIEnv *env, const char *hostname, jboolean includeV6)
 78 {
 79     jobjectArray result = NULL;
 80     char myhostname[NI_MAXHOST + 1];
 81     struct ifaddrs *ifa = NULL;
 82     int familyOrder = 0;
 83     int count = 0, i, j;
 84     int addrs4 = 0, addrs6 = 0, numV4Loopbacks = 0, numV6Loopbacks = 0;
 85     jboolean includeLoopback = JNI_FALSE;
 86     jobject name;
 87 
 88     initInetAddressIDs(env);
 89     JNU_CHECK_EXCEPTION_RETURN(env, NULL);
 90 
 91     /* If the requested name matches this host's hostname, return IP addresses
 92      * from all attached interfaces. (#2844683 et al) This prevents undesired
 93      * PPP dialup, but may return addresses that don't actually correspond to
 94      * the name (if the name actually matches something in DNS etc.
 95      */
 96     myhostname[0] = '\0';
 97     if (gethostname(myhostname, sizeof(myhostname)) == -1) {

134                     addrs6++;
135                     if (isLoopback) numV6Loopbacks++;
136                 } // else we don't care, e.g. AF_LINK
137             }
138         }
139         iter = iter->ifa_next;
140     }
141 
142     if (addrs4 == numV4Loopbacks && addrs6 == numV6Loopbacks) {
143         // We don't have a real IP address, just loopback. We need to include
144         // loopback in our results.
145         includeLoopback = JNI_TRUE;
146     }
147 
148     /* Create and fill the Java array. */
149     int arraySize = addrs4 + addrs6 -
150         (includeLoopback ? 0 : (numV4Loopbacks + numV6Loopbacks));
151     result = (*env)->NewObjectArray(env, arraySize, ia_class, NULL);
152     if (!result) goto done;
153 
154     if ((*env)->GetStaticBooleanField(env, ia_class, ia_preferIPv6AddressID)) {
155         i = includeLoopback ? addrs6 : (addrs6 - numV6Loopbacks);
156         j = 0;
157     } else {
158         i = 0;
159         j = includeLoopback ? addrs4 : (addrs4 - numV4Loopbacks);
160     }
161 
162     // Now loop around the ifaddrs
163     iter = ifa;
164     while (iter != NULL) {
165         if (iter->ifa_addr != NULL) {
166             jboolean isLoopback = iter->ifa_flags & IFF_LOOPBACK;
167             int family = iter->ifa_addr->sa_family;
168 
169             if (iter->ifa_name[0] != '\0' &&
170                 (family == AF_INET || (family == AF_INET6 && includeV6)) &&
171                 (!isLoopback || includeLoopback))
172             {
173                 int port;
174                 int index = (family == AF_INET) ? i++ : j++;

187                 (*env)->DeleteLocalRef(env, o);
188             }
189         }
190         iter = iter->ifa_next;
191     }
192 
193   done:
194     freeifaddrs(ifa);
195 
196     return result;
197 }
198 #endif
199 
200 /*
201  * Class:     java_net_Inet6AddressImpl
202  * Method:    lookupAllHostAddr
203  * Signature: (Ljava/lang/String;)[[B
204  */
205 JNIEXPORT jobjectArray JNICALL
206 Java_java_net_Inet6AddressImpl_lookupAllHostAddr(JNIEnv *env, jobject this,
207                                                  jstring host) {
208     jobjectArray ret = NULL;
209     const char *hostname;
210     int error = 0;
211     struct addrinfo hints, *res = NULL, *resNew = NULL, *last = NULL,
212         *iterator;
213 
214     initInetAddressIDs(env);
215     JNU_CHECK_EXCEPTION_RETURN(env, NULL);
216 
217     if (IS_NULL(host)) {
218         JNU_ThrowNullPointerException(env, "host argument is null");
219         return NULL;
220     }
221     hostname = JNU_GetStringPlatformChars(env, host, JNI_FALSE);
222     CHECK_NULL_RETURN(hostname, NULL);
223 
224     // try once, with our static buffer
225     memset(&hints, 0, sizeof(hints));
226     hints.ai_flags = AI_CANONNAME;
227     hints.ai_family = AF_UNSPEC;
228 
229     error = getaddrinfo(hostname, NULL, &hints, &res);
230 
231     if (error) {
232 #if defined(MACOSX)
233         // if getaddrinfo fails try getifaddrs
234         ret = lookupIfLocalhost(env, hostname, JNI_TRUE);
235         if (ret != NULL || (*env)->ExceptionCheck(env)) {
236             goto cleanupAndReturn;
237         }
238 #endif
239         // report error
240         NET_ThrowUnknownHostExceptionWithGaiError(env, hostname, error);
241         goto cleanupAndReturn;
242     } else {
243         int i = 0, inetCount = 0, inet6Count = 0, inetIndex = 0,
244             inet6Index = 0, originalIndex = 0;
245         int addressPreference =
246             (*env)->GetStaticIntField(env, ia_class, ia_preferIPv6AddressID);;
247         iterator = res;
248         while (iterator != NULL) {
249             // skip duplicates
250             int skip = 0;
251             struct addrinfo *iteratorNew = resNew;
252             while (iteratorNew != NULL) {
253                 if (iterator->ai_family == iteratorNew->ai_family &&
254                     iterator->ai_addrlen == iteratorNew->ai_addrlen) {
255                     if (iteratorNew->ai_family == AF_INET) { /* AF_INET */
256                         struct sockaddr_in *addr1, *addr2;
257                         addr1 = (struct sockaddr_in *)iterator->ai_addr;
258                         addr2 = (struct sockaddr_in *)iteratorNew->ai_addr;
259                         if (addr1->sin_addr.s_addr == addr2->sin_addr.s_addr) {
260                             skip = 1;
261                             break;
262                         }
263                     } else {
264                         int t;
265                         struct sockaddr_in6 *addr1, *addr2;
266                         addr1 = (struct sockaddr_in6 *)iterator->ai_addr;

305                     last->ai_next = next;
306                 }
307                 last = next;
308                 i++;
309                 if (iterator->ai_family == AF_INET) {
310                     inetCount++;
311                 } else if (iterator->ai_family == AF_INET6) {
312                     inet6Count++;
313                 }
314             }
315             iterator = iterator->ai_next;
316         }
317 
318         // allocate array - at this point i contains the number of addresses
319         ret = (*env)->NewObjectArray(env, i, ia_class, NULL);
320         if (IS_NULL(ret)) {
321             /* we may have memory to free at the end of this */
322             goto cleanupAndReturn;
323         }
324 
325         if (addressPreference == java_net_InetAddress_PREFER_IPV6_VALUE) {
326             inetIndex = inet6Count;
327             inet6Index = 0;
328         } else if (addressPreference == java_net_InetAddress_PREFER_IPV4_VALUE) {
329             inetIndex = 0;
330             inet6Index = inetCount;
331         } else if (addressPreference == java_net_InetAddress_PREFER_SYSTEM_VALUE) {
332             inetIndex = inet6Index = originalIndex = 0;
333         }
334 
335         iterator = resNew;
336         while (iterator != NULL) {
337             if (iterator->ai_family == AF_INET) {
338                 jobject iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID);
339                 if (IS_NULL(iaObj)) {
340                     ret = NULL;
341                     goto cleanupAndReturn;
342                 }
343                 setInetAddress_addr(env, iaObj, ntohl(((struct sockaddr_in*)iterator->ai_addr)->sin_addr.s_addr));
344                 if ((*env)->ExceptionCheck(env))
345                     goto cleanupAndReturn;
346                 setInetAddress_hostName(env, iaObj, host);
347                 if ((*env)->ExceptionCheck(env))
348                     goto cleanupAndReturn;
349                 (*env)->SetObjectArrayElement(env, ret, (inetIndex | originalIndex), iaObj);
350                 inetIndex++;
351             } else if (iterator->ai_family == AF_INET6) {

354                 jobject iaObj = (*env)->NewObject(env, ia6_class, ia6_ctrID);
355                 if (IS_NULL(iaObj)) {
356                     ret = NULL;
357                     goto cleanupAndReturn;
358                 }
359                 ret1 = setInet6Address_ipaddress(env, iaObj, (char *)&(((struct sockaddr_in6*)iterator->ai_addr)->sin6_addr));
360                 if (ret1 == JNI_FALSE) {
361                     ret = NULL;
362                     goto cleanupAndReturn;
363                 }
364                 scope = ((struct sockaddr_in6 *)iterator->ai_addr)->sin6_scope_id;
365                 if (scope != 0) { // zero is default value, no need to set
366                     setInet6Address_scopeid(env, iaObj, scope);
367                 }
368                 setInetAddress_hostName(env, iaObj, host);
369                 if ((*env)->ExceptionCheck(env))
370                     goto cleanupAndReturn;
371                 (*env)->SetObjectArrayElement(env, ret, (inet6Index | originalIndex), iaObj);
372                 inet6Index++;
373             }
374             if (addressPreference == java_net_InetAddress_PREFER_SYSTEM_VALUE) {

375                 originalIndex++;
376                 inetIndex = inet6Index = 0;
377             }
378             iterator = iterator->ai_next;
379         }
380     }
381 cleanupAndReturn:
382     JNU_ReleaseStringPlatformChars(env, host, hostname);
383     while (resNew != NULL) {
384         last = resNew;
385         resNew = resNew->ai_next;
386         free(last);
387     }
388     if (res != NULL) {
389         freeaddrinfo(res);
390     }
391     return ret;
392 }
393 
394 /*

  1 /*
  2  * Copyright (c) 2000, 2021, 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

 24  */
 25 #include <ctype.h>
 26 #include <errno.h>
 27 #include <stdlib.h>
 28 #include <string.h>
 29 #include <sys/time.h>
 30 #include <sys/types.h>
 31 #include <netinet/in.h>
 32 #include <netinet/icmp6.h>
 33 
 34 #if defined(_ALLBSD_SOURCE)
 35 #include <ifaddrs.h>
 36 #include <net/if.h>
 37 #endif
 38 
 39 #include "net_util.h"
 40 
 41 #include "java_net_InetAddress.h"
 42 #include "java_net_Inet4AddressImpl.h"
 43 #include "java_net_Inet6AddressImpl.h"
 44 #include "java_net_spi_InetAddressResolver_LookupPolicy.h"
 45 
 46 
 47 #define SET_NONBLOCKING(fd) {       \
 48     int flags = fcntl(fd, F_GETFL); \
 49     flags |= O_NONBLOCK;            \
 50     fcntl(fd, F_SETFL, flags);      \
 51 }
 52 
 53 /*
 54  * Inet6AddressImpl
 55  */
 56 
 57 /*
 58  * Class:     java_net_Inet6AddressImpl
 59  * Method:    getLocalHostName
 60  * Signature: ()Ljava/lang/String;
 61  */
 62 JNIEXPORT jstring JNICALL
 63 Java_java_net_Inet6AddressImpl_getLocalHostName(JNIEnv *env, jobject this) {
 64     char hostname[NI_MAXHOST + 1];
 65 
 66     hostname[0] = '\0';
 67     if (gethostname(hostname, sizeof(hostname)) != 0) {
 68         strcpy(hostname, "localhost");
 69     } else {
 70         // make sure string is null-terminated
 71         hostname[NI_MAXHOST] = '\0';
 72     }
 73     return (*env)->NewStringUTF(env, hostname);
 74 }
 75 
 76 #if defined(MACOSX)
 77 /* also called from Inet4AddressImpl.c */
 78 __private_extern__ jobjectArray
 79 lookupIfLocalhost(JNIEnv *env, const char *hostname, jboolean includeV6, int characteristics)
 80 {
 81     jobjectArray result = NULL;
 82     char myhostname[NI_MAXHOST + 1];
 83     struct ifaddrs *ifa = NULL;
 84     int familyOrder = 0;
 85     int count = 0, i, j;
 86     int addrs4 = 0, addrs6 = 0, numV4Loopbacks = 0, numV6Loopbacks = 0;
 87     jboolean includeLoopback = JNI_FALSE;
 88     jobject name;
 89 
 90     initInetAddressIDs(env);
 91     JNU_CHECK_EXCEPTION_RETURN(env, NULL);
 92 
 93     /* If the requested name matches this host's hostname, return IP addresses
 94      * from all attached interfaces. (#2844683 et al) This prevents undesired
 95      * PPP dialup, but may return addresses that don't actually correspond to
 96      * the name (if the name actually matches something in DNS etc.
 97      */
 98     myhostname[0] = '\0';
 99     if (gethostname(myhostname, sizeof(myhostname)) == -1) {

136                     addrs6++;
137                     if (isLoopback) numV6Loopbacks++;
138                 } // else we don't care, e.g. AF_LINK
139             }
140         }
141         iter = iter->ifa_next;
142     }
143 
144     if (addrs4 == numV4Loopbacks && addrs6 == numV6Loopbacks) {
145         // We don't have a real IP address, just loopback. We need to include
146         // loopback in our results.
147         includeLoopback = JNI_TRUE;
148     }
149 
150     /* Create and fill the Java array. */
151     int arraySize = addrs4 + addrs6 -
152         (includeLoopback ? 0 : (numV4Loopbacks + numV6Loopbacks));
153     result = (*env)->NewObjectArray(env, arraySize, ia_class, NULL);
154     if (!result) goto done;
155 
156     if ((characteristics & java_net_spi_InetAddressResolver_LookupPolicy_IPV6_FIRST) != 0) {
157         i = includeLoopback ? addrs6 : (addrs6 - numV6Loopbacks);
158         j = 0;
159     } else {
160         i = 0;
161         j = includeLoopback ? addrs4 : (addrs4 - numV4Loopbacks);
162     }
163 
164     // Now loop around the ifaddrs
165     iter = ifa;
166     while (iter != NULL) {
167         if (iter->ifa_addr != NULL) {
168             jboolean isLoopback = iter->ifa_flags & IFF_LOOPBACK;
169             int family = iter->ifa_addr->sa_family;
170 
171             if (iter->ifa_name[0] != '\0' &&
172                 (family == AF_INET || (family == AF_INET6 && includeV6)) &&
173                 (!isLoopback || includeLoopback))
174             {
175                 int port;
176                 int index = (family == AF_INET) ? i++ : j++;

189                 (*env)->DeleteLocalRef(env, o);
190             }
191         }
192         iter = iter->ifa_next;
193     }
194 
195   done:
196     freeifaddrs(ifa);
197 
198     return result;
199 }
200 #endif
201 
202 /*
203  * Class:     java_net_Inet6AddressImpl
204  * Method:    lookupAllHostAddr
205  * Signature: (Ljava/lang/String;)[[B
206  */
207 JNIEXPORT jobjectArray JNICALL
208 Java_java_net_Inet6AddressImpl_lookupAllHostAddr(JNIEnv *env, jobject this,
209                                                  jstring host, jint characteristics) {
210     jobjectArray ret = NULL;
211     const char *hostname;
212     int error = 0;
213     struct addrinfo hints, *res = NULL, *resNew = NULL, *last = NULL,
214         *iterator;
215 
216     initInetAddressIDs(env);
217     JNU_CHECK_EXCEPTION_RETURN(env, NULL);
218 
219     if (IS_NULL(host)) {
220         JNU_ThrowNullPointerException(env, "host argument is null");
221         return NULL;
222     }
223     hostname = JNU_GetStringPlatformChars(env, host, JNI_FALSE);
224     CHECK_NULL_RETURN(hostname, NULL);
225 
226     // try once, with our static buffer
227     memset(&hints, 0, sizeof(hints));
228     hints.ai_flags = AI_CANONNAME;
229     hints.ai_family = lookupCharacteristicsToAddressFamily(characteristics);
230 
231     error = getaddrinfo(hostname, NULL, &hints, &res);
232 
233     if (error) {
234 #if defined(MACOSX)
235         // if getaddrinfo fails try getifaddrs
236         ret = lookupIfLocalhost(env, hostname, JNI_TRUE, characteristics);
237         if (ret != NULL || (*env)->ExceptionCheck(env)) {
238             goto cleanupAndReturn;
239         }
240 #endif
241         // report error
242         NET_ThrowUnknownHostExceptionWithGaiError(env, hostname, error);
243         goto cleanupAndReturn;
244     } else {
245         int i = 0, inetCount = 0, inet6Count = 0, inetIndex = 0,
246             inet6Index = 0, originalIndex = 0;


247         iterator = res;
248         while (iterator != NULL) {
249             // skip duplicates
250             int skip = 0;
251             struct addrinfo *iteratorNew = resNew;
252             while (iteratorNew != NULL) {
253                 if (iterator->ai_family == iteratorNew->ai_family &&
254                     iterator->ai_addrlen == iteratorNew->ai_addrlen) {
255                     if (iteratorNew->ai_family == AF_INET) { /* AF_INET */
256                         struct sockaddr_in *addr1, *addr2;
257                         addr1 = (struct sockaddr_in *)iterator->ai_addr;
258                         addr2 = (struct sockaddr_in *)iteratorNew->ai_addr;
259                         if (addr1->sin_addr.s_addr == addr2->sin_addr.s_addr) {
260                             skip = 1;
261                             break;
262                         }
263                     } else {
264                         int t;
265                         struct sockaddr_in6 *addr1, *addr2;
266                         addr1 = (struct sockaddr_in6 *)iterator->ai_addr;

305                     last->ai_next = next;
306                 }
307                 last = next;
308                 i++;
309                 if (iterator->ai_family == AF_INET) {
310                     inetCount++;
311                 } else if (iterator->ai_family == AF_INET6) {
312                     inet6Count++;
313                 }
314             }
315             iterator = iterator->ai_next;
316         }
317 
318         // allocate array - at this point i contains the number of addresses
319         ret = (*env)->NewObjectArray(env, i, ia_class, NULL);
320         if (IS_NULL(ret)) {
321             /* we may have memory to free at the end of this */
322             goto cleanupAndReturn;
323         }
324 
325         if ((characteristics & java_net_spi_InetAddressResolver_LookupPolicy_IPV6_FIRST) != 0) {
326             inetIndex = inet6Count;
327             inet6Index = 0;
328         } else if ((characteristics & java_net_spi_InetAddressResolver_LookupPolicy_IPV4_FIRST) != 0) {
329             inetIndex = 0;
330             inet6Index = inetCount;
331         } else {
332             inetIndex = inet6Index = originalIndex = 0;
333         }
334 
335         iterator = resNew;
336         while (iterator != NULL) {
337             if (iterator->ai_family == AF_INET) {
338                 jobject iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID);
339                 if (IS_NULL(iaObj)) {
340                     ret = NULL;
341                     goto cleanupAndReturn;
342                 }
343                 setInetAddress_addr(env, iaObj, ntohl(((struct sockaddr_in*)iterator->ai_addr)->sin_addr.s_addr));
344                 if ((*env)->ExceptionCheck(env))
345                     goto cleanupAndReturn;
346                 setInetAddress_hostName(env, iaObj, host);
347                 if ((*env)->ExceptionCheck(env))
348                     goto cleanupAndReturn;
349                 (*env)->SetObjectArrayElement(env, ret, (inetIndex | originalIndex), iaObj);
350                 inetIndex++;
351             } else if (iterator->ai_family == AF_INET6) {

354                 jobject iaObj = (*env)->NewObject(env, ia6_class, ia6_ctrID);
355                 if (IS_NULL(iaObj)) {
356                     ret = NULL;
357                     goto cleanupAndReturn;
358                 }
359                 ret1 = setInet6Address_ipaddress(env, iaObj, (char *)&(((struct sockaddr_in6*)iterator->ai_addr)->sin6_addr));
360                 if (ret1 == JNI_FALSE) {
361                     ret = NULL;
362                     goto cleanupAndReturn;
363                 }
364                 scope = ((struct sockaddr_in6 *)iterator->ai_addr)->sin6_scope_id;
365                 if (scope != 0) { // zero is default value, no need to set
366                     setInet6Address_scopeid(env, iaObj, scope);
367                 }
368                 setInetAddress_hostName(env, iaObj, host);
369                 if ((*env)->ExceptionCheck(env))
370                     goto cleanupAndReturn;
371                 (*env)->SetObjectArrayElement(env, ret, (inet6Index | originalIndex), iaObj);
372                 inet6Index++;
373             }
374             // Check if addresses are requested to be returned in SYSTEM order
375             if (addressesInSystemOrder(characteristics)) {
376                 originalIndex++;
377                 inetIndex = inet6Index = 0;
378             }
379             iterator = iterator->ai_next;
380         }
381     }
382 cleanupAndReturn:
383     JNU_ReleaseStringPlatformChars(env, host, hostname);
384     while (resNew != NULL) {
385         last = resNew;
386         resNew = resNew->ai_next;
387         free(last);
388     }
389     if (res != NULL) {
390         freeaddrinfo(res);
391     }
392     return ret;
393 }
394 
395 /*
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