src/java.base/share/native/libnet/net_util.c - platform/libcore - Git at Google

 /*
  * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 #include "net_util.h"

 #include "java_net_InetAddress.h"

 int IPv6_supported();
 int reuseport_supported();

 static int IPv6_available;
 static int REUSEPORT_available;

 JNIEXPORT jint JNICALL ipv6_available()
 {
     return IPv6_available;
 }

 JNIEXPORT jint JNICALL reuseport_available()
 {
     return REUSEPORT_available;
 }

 JNIEXPORT jint JNICALL
 DEF_JNI_OnLoad(JavaVM *vm, void *reserved)
 {
     JNIEnv *env;
     jclass iCls;
     jmethodID mid;
     jstring s;
     jint preferIPv4Stack;
     if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_2) != JNI_OK) {
         return JNI_EVERSION; /* JNI version not supported */
     }

     iCls = (*env)->FindClass(env, "java/lang/Boolean");
     CHECK_NULL_RETURN(iCls, JNI_VERSION_1_2);
     mid = (*env)->GetStaticMethodID(env, iCls, "getBoolean", "(Ljava/lang/String;)Z");
     CHECK_NULL_RETURN(mid, JNI_VERSION_1_2);
     s = (*env)->NewStringUTF(env, "java.net.preferIPv4Stack");
     CHECK_NULL_RETURN(s, JNI_VERSION_1_2);
     preferIPv4Stack = (*env)->CallStaticBooleanMethod(env, iCls, mid, s);

     /*
      * Since we have initialized and loaded the socket library we will
      * check now whether we have IPv6 on this platform and if the
      * supporting socket APIs are available
      */
     IPv6_available = IPv6_supported() & (!preferIPv4Stack);

     /* check if SO_REUSEPORT is supported on this platform */
     REUSEPORT_available = reuseport_supported();
     platformInit();
     parseExclusiveBindProperty(env);

     return JNI_VERSION_1_2;
 }

 static int initialized = 0;

 JNIEXPORT void JNICALL initInetAddressIDs(JNIEnv *env) {
     if (!initialized) {
         Java_java_net_InetAddress_init(env, 0);
         JNU_CHECK_EXCEPTION(env);
         Java_java_net_Inet4Address_init(env, 0);
         JNU_CHECK_EXCEPTION(env);
         Java_java_net_Inet6Address_init(env, 0);
         JNU_CHECK_EXCEPTION(env);
         initialized = 1;
     }
 }

 /* The address, and family fields used to be in InetAddress
  * but are now in an implementation object. So, there is an extra
  * level of indirection to access them now.
  */

 extern jclass iac_class;
 extern jfieldID ia_holderID;
 extern jfieldID iac_addressID;
 extern jfieldID iac_familyID;

 /**
  * set_ methods return JNI_TRUE on success JNI_FALSE on error
  * get_ methods that return +ve int return -1 on error
  * get_ methods that return objects return NULL on error.
  */
 jobject getInet6Address_scopeifname(JNIEnv *env, jobject iaObj) {
     jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
     CHECK_NULL_RETURN(holder, NULL);
     return (*env)->GetObjectField(env, holder, ia6_scopeifnameID);
 }

 jboolean setInet6Address_scopeifname(JNIEnv *env, jobject iaObj, jobject scopeifname) {
     jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
     CHECK_NULL_RETURN(holder, JNI_FALSE);
     (*env)->SetObjectField(env, holder, ia6_scopeifnameID, scopeifname);
     return JNI_TRUE;
 }

 jboolean getInet6Address_scopeid_set(JNIEnv *env, jobject iaObj) {
     jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
     CHECK_NULL_RETURN(holder, JNI_FALSE);
     return (*env)->GetBooleanField(env, holder, ia6_scopeidsetID);
 }

 unsigned int getInet6Address_scopeid(JNIEnv *env, jobject iaObj) {
     jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
     CHECK_NULL_RETURN(holder, 0);
     return (unsigned int)(*env)->GetIntField(env, holder, ia6_scopeidID);
 }

 jboolean setInet6Address_scopeid(JNIEnv *env, jobject iaObj, int scopeid) {
     jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
     CHECK_NULL_RETURN(holder, JNI_FALSE);
     (*env)->SetIntField(env, holder, ia6_scopeidID, scopeid);
     if (scopeid > 0) {
         (*env)->SetBooleanField(env, holder, ia6_scopeidsetID, JNI_TRUE);
     }
     return JNI_TRUE;
 }

 jboolean getInet6Address_ipaddress(JNIEnv *env, jobject iaObj, char *dest) {
     jobject holder, addr;

     holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
     CHECK_NULL_RETURN(holder, JNI_FALSE);
     addr =  (*env)->GetObjectField(env, holder, ia6_ipaddressID);
     CHECK_NULL_RETURN(addr, JNI_FALSE);
     (*env)->GetByteArrayRegion(env, addr, 0, 16, (jbyte *)dest);
     return JNI_TRUE;
 }

 jboolean setInet6Address_ipaddress(JNIEnv *env, jobject iaObj, char *address) {
     jobject holder;
     jbyteArray addr;

     holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
     CHECK_NULL_RETURN(holder, JNI_FALSE);
     addr =  (jbyteArray)(*env)->GetObjectField(env, holder, ia6_ipaddressID);
     if (addr == NULL) {
         addr = (*env)->NewByteArray(env, 16);
         CHECK_NULL_RETURN(addr, JNI_FALSE);
         (*env)->SetObjectField(env, holder, ia6_ipaddressID, addr);
     }
     (*env)->SetByteArrayRegion(env, addr, 0, 16, (jbyte *)address);
     return JNI_TRUE;
 }

 void setInetAddress_addr(JNIEnv *env, jobject iaObj, int address) {
     jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);
     CHECK_NULL_THROW_NPE(env, holder, "InetAddress holder is null");
     (*env)->SetIntField(env, holder, iac_addressID, address);
 }

 void setInetAddress_family(JNIEnv *env, jobject iaObj, int family) {
     jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);
     CHECK_NULL_THROW_NPE(env, holder, "InetAddress holder is null");
     (*env)->SetIntField(env, holder, iac_familyID, family);
 }

 void setInetAddress_hostName(JNIEnv *env, jobject iaObj, jobject host) {
     jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);
     CHECK_NULL_THROW_NPE(env, holder, "InetAddress holder is null");
     (*env)->SetObjectField(env, holder, iac_hostNameID, host);
     (*env)->SetObjectField(env, holder, iac_origHostNameID, host);
 }

 int getInetAddress_addr(JNIEnv *env, jobject iaObj) {
     jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);
     CHECK_NULL_THROW_NPE_RETURN(env, holder, "InetAddress holder is null", -1);
     return (*env)->GetIntField(env, holder, iac_addressID);
 }

 int getInetAddress_family(JNIEnv *env, jobject iaObj) {
     jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);
     CHECK_NULL_THROW_NPE_RETURN(env, holder, "InetAddress holder is null", -1);
     return (*env)->GetIntField(env, holder, iac_familyID);
 }

 jobject getInetAddress_hostName(JNIEnv *env, jobject iaObj) {
     jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);
     CHECK_NULL_THROW_NPE_RETURN(env, holder, "InetAddress holder is null", NULL);
     return (*env)->GetObjectField(env, holder, iac_hostNameID);
 }

 JNIEXPORT jobject JNICALL
 NET_SockaddrToInetAddress(JNIEnv *env, SOCKETADDRESS *sa, int *port) {
     jobject iaObj;
     if (sa->sa.sa_family == AF_INET6) {
         jbyte *caddr = (jbyte *)&sa->sa6.sin6_addr;
         if (NET_IsIPv4Mapped(caddr)) {
             int address;
             iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID);
             CHECK_NULL_RETURN(iaObj, NULL);
             address = NET_IPv4MappedToIPv4(caddr);
             setInetAddress_addr(env, iaObj, address);
             JNU_CHECK_EXCEPTION_RETURN(env, NULL);
             setInetAddress_family(env, iaObj, java_net_InetAddress_IPv4);
             JNU_CHECK_EXCEPTION_RETURN(env, NULL);
         } else {
             jboolean ret;
             iaObj = (*env)->NewObject(env, ia6_class, ia6_ctrID);
             CHECK_NULL_RETURN(iaObj, NULL);
             ret = setInet6Address_ipaddress(env, iaObj, (char *)&sa->sa6.sin6_addr);
             if (ret == JNI_FALSE)
                 return NULL;
             setInetAddress_family(env, iaObj, java_net_InetAddress_IPv6);
             JNU_CHECK_EXCEPTION_RETURN(env, NULL);
             setInet6Address_scopeid(env, iaObj, sa->sa6.sin6_scope_id);
         }
         *port = ntohs(sa->sa6.sin6_port);
     } else {
         iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID);
         CHECK_NULL_RETURN(iaObj, NULL);
         setInetAddress_family(env, iaObj, java_net_InetAddress_IPv4);
         JNU_CHECK_EXCEPTION_RETURN(env, NULL);
         setInetAddress_addr(env, iaObj, ntohl(sa->sa4.sin_addr.s_addr));
         JNU_CHECK_EXCEPTION_RETURN(env, NULL);
         *port = ntohs(sa->sa4.sin_port);
     }
     return iaObj;
 }

 JNIEXPORT jboolean JNICALL
 NET_SockaddrEqualsInetAddress(JNIEnv *env, SOCKETADDRESS *sa, jobject iaObj)
 {
     jint family = getInetAddress_family(env, iaObj) ==
         java_net_InetAddress_IPv4 ? AF_INET : AF_INET6;
     JNU_CHECK_EXCEPTION_RETURN(env, JNI_FALSE);
     if (sa->sa.sa_family == AF_INET6) {
         jbyte *caddrNew = (jbyte *)&sa->sa6.sin6_addr;
         if (NET_IsIPv4Mapped(caddrNew)) {
             int addrNew, addrCur;
             if (family == AF_INET6) {
                 return JNI_FALSE;
             }
             addrNew = NET_IPv4MappedToIPv4(caddrNew);
             addrCur = getInetAddress_addr(env, iaObj);
             JNU_CHECK_EXCEPTION_RETURN(env, JNI_FALSE);
             if (addrNew == addrCur) {
                 return JNI_TRUE;
             } else {
                 return JNI_FALSE;
             }
         } else {
             jbyte caddrCur[16];
             if (family == AF_INET) {
                 return JNI_FALSE;
             }
             getInet6Address_ipaddress(env, iaObj, (char *)caddrCur);
             if (NET_IsEqual(caddrNew, caddrCur) &&
                 sa->sa6.sin6_scope_id == getInet6Address_scopeid(env, iaObj))
             {
                 return JNI_TRUE;
             } else {
                 return JNI_FALSE;
             }
         }
     } else {
         int addrNew, addrCur;
         if (family != AF_INET) {
             return JNI_FALSE;
         }
         addrNew = ntohl(sa->sa4.sin_addr.s_addr);
         addrCur = getInetAddress_addr(env, iaObj);
         JNU_CHECK_EXCEPTION_RETURN(env, JNI_FALSE);
         if (addrNew == addrCur) {
             return JNI_TRUE;
         } else {
             return JNI_FALSE;
         }
     }
 }

 JNIEXPORT jint JNICALL
 NET_GetPortFromSockaddr(SOCKETADDRESS *sa) {
     if (sa->sa.sa_family == AF_INET6) {
         return ntohs(sa->sa6.sin6_port);
     } else {
         return ntohs(sa->sa4.sin_port);
     }
 }

 unsigned short
 in_cksum(unsigned short *addr, int len) {
     int nleft = len;
     int sum = 0;
     unsigned short *w = addr;
     unsigned short answer = 0;
     while(nleft > 1) {
         sum += *w++;
         nleft -= 2;
     }

     if (nleft == 1) {
         *(unsigned char *) (&answer) = *(unsigned char *)w;
         sum += answer;
     }

     sum = (sum >> 16) + (sum & 0xffff);
     sum += (sum >> 16);
     answer = ~sum;
     return (answer);
 }
	/*
	* Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	#include "net_util.h"

	#include "java_net_InetAddress.h"

	int IPv6_supported();
	int reuseport_supported();

	static int IPv6_available;
	static int REUSEPORT_available;

	JNIEXPORT jint JNICALL ipv6_available()
	{
	return IPv6_available;
	}

	JNIEXPORT jint JNICALL reuseport_available()
	{
	return REUSEPORT_available;
	}

	JNIEXPORT jint JNICALL
	DEF_JNI_OnLoad(JavaVM vm, void reserved)
	{
	JNIEnv *env;
	jclass iCls;
	jmethodID mid;
	jstring s;
	jint preferIPv4Stack;
	if ((vm)->GetEnv(vm, (void*) &env, JNI_VERSION_1_2) != JNI_OK) {
	return JNI_EVERSION; /* JNI version not supported */
	}

	iCls = (*env)->FindClass(env, "java/lang/Boolean");
	CHECK_NULL_RETURN(iCls, JNI_VERSION_1_2);
	mid = (*env)->GetStaticMethodID(env, iCls, "getBoolean", "(Ljava/lang/String;)Z");
	CHECK_NULL_RETURN(mid, JNI_VERSION_1_2);
	s = (*env)->NewStringUTF(env, "java.net.preferIPv4Stack");
	CHECK_NULL_RETURN(s, JNI_VERSION_1_2);
	preferIPv4Stack = (*env)->CallStaticBooleanMethod(env, iCls, mid, s);

	/*
	* Since we have initialized and loaded the socket library we will
	* check now whether we have IPv6 on this platform and if the
	* supporting socket APIs are available
	*/
	IPv6_available = IPv6_supported() & (!preferIPv4Stack);

	/* check if SO_REUSEPORT is supported on this platform */
	REUSEPORT_available = reuseport_supported();
	platformInit();
	parseExclusiveBindProperty(env);

	return JNI_VERSION_1_2;
	}

	static int initialized = 0;

	JNIEXPORT void JNICALL initInetAddressIDs(JNIEnv *env) {
	if (!initialized) {
	Java_java_net_InetAddress_init(env, 0);
	JNU_CHECK_EXCEPTION(env);
	Java_java_net_Inet4Address_init(env, 0);
	JNU_CHECK_EXCEPTION(env);
	Java_java_net_Inet6Address_init(env, 0);
	JNU_CHECK_EXCEPTION(env);
	initialized = 1;
	}
	}

	/* The address, and family fields used to be in InetAddress
	* but are now in an implementation object. So, there is an extra
	* level of indirection to access them now.
	*/

	extern jclass iac_class;
	extern jfieldID ia_holderID;
	extern jfieldID iac_addressID;
	extern jfieldID iac_familyID;

	/**
	* set_ methods return JNI_TRUE on success JNI_FALSE on error
	* get_ methods that return +ve int return -1 on error
	* get_ methods that return objects return NULL on error.
	*/
	jobject getInet6Address_scopeifname(JNIEnv *env, jobject iaObj) {
	jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
	CHECK_NULL_RETURN(holder, NULL);
	return (*env)->GetObjectField(env, holder, ia6_scopeifnameID);
	}

	jboolean setInet6Address_scopeifname(JNIEnv *env, jobject iaObj, jobject scopeifname) {
	jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
	CHECK_NULL_RETURN(holder, JNI_FALSE);
	(*env)->SetObjectField(env, holder, ia6_scopeifnameID, scopeifname);
	return JNI_TRUE;
	}

	jboolean getInet6Address_scopeid_set(JNIEnv *env, jobject iaObj) {
	jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
	CHECK_NULL_RETURN(holder, JNI_FALSE);
	return (*env)->GetBooleanField(env, holder, ia6_scopeidsetID);
	}

	unsigned int getInet6Address_scopeid(JNIEnv *env, jobject iaObj) {
	jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
	CHECK_NULL_RETURN(holder, 0);
	return (unsigned int)(*env)->GetIntField(env, holder, ia6_scopeidID);
	}

	jboolean setInet6Address_scopeid(JNIEnv *env, jobject iaObj, int scopeid) {
	jobject holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
	CHECK_NULL_RETURN(holder, JNI_FALSE);
	(*env)->SetIntField(env, holder, ia6_scopeidID, scopeid);
	if (scopeid > 0) {
	(*env)->SetBooleanField(env, holder, ia6_scopeidsetID, JNI_TRUE);
	}
	return JNI_TRUE;
	}

	jboolean getInet6Address_ipaddress(JNIEnv env, jobject iaObj, char dest) {
	jobject holder, addr;

	holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
	CHECK_NULL_RETURN(holder, JNI_FALSE);
	addr = (*env)->GetObjectField(env, holder, ia6_ipaddressID);
	CHECK_NULL_RETURN(addr, JNI_FALSE);
	(env)->GetByteArrayRegion(env, addr, 0, 16, (jbyte )dest);
	return JNI_TRUE;
	}

	jboolean setInet6Address_ipaddress(JNIEnv env, jobject iaObj, char address) {
	jobject holder;
	jbyteArray addr;

	holder = (*env)->GetObjectField(env, iaObj, ia6_holder6ID);
	CHECK_NULL_RETURN(holder, JNI_FALSE);
	addr = (jbyteArray)(*env)->GetObjectField(env, holder, ia6_ipaddressID);
	if (addr == NULL) {
	addr = (*env)->NewByteArray(env, 16);
	CHECK_NULL_RETURN(addr, JNI_FALSE);
	(*env)->SetObjectField(env, holder, ia6_ipaddressID, addr);
	}
	(env)->SetByteArrayRegion(env, addr, 0, 16, (jbyte )address);
	return JNI_TRUE;
	}

	void setInetAddress_addr(JNIEnv *env, jobject iaObj, int address) {
	jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);
	CHECK_NULL_THROW_NPE(env, holder, "InetAddress holder is null");
	(*env)->SetIntField(env, holder, iac_addressID, address);
	}

	void setInetAddress_family(JNIEnv *env, jobject iaObj, int family) {
	jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);
	CHECK_NULL_THROW_NPE(env, holder, "InetAddress holder is null");
	(*env)->SetIntField(env, holder, iac_familyID, family);
	}

	void setInetAddress_hostName(JNIEnv *env, jobject iaObj, jobject host) {
	jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);
	CHECK_NULL_THROW_NPE(env, holder, "InetAddress holder is null");
	(*env)->SetObjectField(env, holder, iac_hostNameID, host);
	(*env)->SetObjectField(env, holder, iac_origHostNameID, host);
	}

	int getInetAddress_addr(JNIEnv *env, jobject iaObj) {
	jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);
	CHECK_NULL_THROW_NPE_RETURN(env, holder, "InetAddress holder is null", -1);
	return (*env)->GetIntField(env, holder, iac_addressID);
	}

	int getInetAddress_family(JNIEnv *env, jobject iaObj) {
	jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);
	CHECK_NULL_THROW_NPE_RETURN(env, holder, "InetAddress holder is null", -1);
	return (*env)->GetIntField(env, holder, iac_familyID);
	}

	jobject getInetAddress_hostName(JNIEnv *env, jobject iaObj) {
	jobject holder = (*env)->GetObjectField(env, iaObj, ia_holderID);
	CHECK_NULL_THROW_NPE_RETURN(env, holder, "InetAddress holder is null", NULL);
	return (*env)->GetObjectField(env, holder, iac_hostNameID);
	}

	JNIEXPORT jobject JNICALL
	NET_SockaddrToInetAddress(JNIEnv env, SOCKETADDRESS sa, int *port) {
	jobject iaObj;
	if (sa->sa.sa_family == AF_INET6) {
	jbyte caddr = (jbyte )&sa->sa6.sin6_addr;
	if (NET_IsIPv4Mapped(caddr)) {
	int address;
	iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID);
	CHECK_NULL_RETURN(iaObj, NULL);
	address = NET_IPv4MappedToIPv4(caddr);
	setInetAddress_addr(env, iaObj, address);
	JNU_CHECK_EXCEPTION_RETURN(env, NULL);
	setInetAddress_family(env, iaObj, java_net_InetAddress_IPv4);
	JNU_CHECK_EXCEPTION_RETURN(env, NULL);
	} else {
	jboolean ret;
	iaObj = (*env)->NewObject(env, ia6_class, ia6_ctrID);
	CHECK_NULL_RETURN(iaObj, NULL);
	ret = setInet6Address_ipaddress(env, iaObj, (char *)&sa->sa6.sin6_addr);
	if (ret == JNI_FALSE)
	return NULL;
	setInetAddress_family(env, iaObj, java_net_InetAddress_IPv6);
	JNU_CHECK_EXCEPTION_RETURN(env, NULL);
	setInet6Address_scopeid(env, iaObj, sa->sa6.sin6_scope_id);
	}
	*port = ntohs(sa->sa6.sin6_port);
	} else {
	iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID);
	CHECK_NULL_RETURN(iaObj, NULL);
	setInetAddress_family(env, iaObj, java_net_InetAddress_IPv4);
	JNU_CHECK_EXCEPTION_RETURN(env, NULL);
	setInetAddress_addr(env, iaObj, ntohl(sa->sa4.sin_addr.s_addr));
	JNU_CHECK_EXCEPTION_RETURN(env, NULL);
	*port = ntohs(sa->sa4.sin_port);
	}
	return iaObj;
	}

	JNIEXPORT jboolean JNICALL
	NET_SockaddrEqualsInetAddress(JNIEnv env, SOCKETADDRESS sa, jobject iaObj)
	{
	jint family = getInetAddress_family(env, iaObj) ==
	java_net_InetAddress_IPv4 ? AF_INET : AF_INET6;
	JNU_CHECK_EXCEPTION_RETURN(env, JNI_FALSE);
	if (sa->sa.sa_family == AF_INET6) {
	jbyte caddrNew = (jbyte )&sa->sa6.sin6_addr;
	if (NET_IsIPv4Mapped(caddrNew)) {
	int addrNew, addrCur;
	if (family == AF_INET6) {
	return JNI_FALSE;
	}
	addrNew = NET_IPv4MappedToIPv4(caddrNew);
	addrCur = getInetAddress_addr(env, iaObj);
	JNU_CHECK_EXCEPTION_RETURN(env, JNI_FALSE);
	if (addrNew == addrCur) {
	return JNI_TRUE;
	} else {
	return JNI_FALSE;
	}
	} else {
	jbyte caddrCur[16];
	if (family == AF_INET) {
	return JNI_FALSE;
	}
	getInet6Address_ipaddress(env, iaObj, (char *)caddrCur);
	if (NET_IsEqual(caddrNew, caddrCur) &&
	sa->sa6.sin6_scope_id == getInet6Address_scopeid(env, iaObj))
	{
	return JNI_TRUE;
	} else {
	return JNI_FALSE;
	}
	}
	} else {
	int addrNew, addrCur;
	if (family != AF_INET) {
	return JNI_FALSE;
	}
	addrNew = ntohl(sa->sa4.sin_addr.s_addr);
	addrCur = getInetAddress_addr(env, iaObj);
	JNU_CHECK_EXCEPTION_RETURN(env, JNI_FALSE);
	if (addrNew == addrCur) {
	return JNI_TRUE;
	} else {
	return JNI_FALSE;
	}
	}
	}

	JNIEXPORT jint JNICALL
	NET_GetPortFromSockaddr(SOCKETADDRESS *sa) {
	if (sa->sa.sa_family == AF_INET6) {
	return ntohs(sa->sa6.sin6_port);
	} else {
	return ntohs(sa->sa4.sin_port);
	}
	}

	unsigned short
	in_cksum(unsigned short *addr, int len) {
	int nleft = len;
	int sum = 0;
	unsigned short *w = addr;
	unsigned short answer = 0;
	while(nleft > 1) {
	sum += *w++;
	nleft -= 2;
	}

	if (nleft == 1) {
	(unsigned char ) (&answer) = (unsigned char )w;
	sum += answer;
	}

	sum = (sum >> 16) + (sum & 0xffff);
	sum += (sum >> 16);
	answer = ~sum;
	return (answer);
	}