JDK14/Java14源码在线阅读
/*
* Copyright (c) 2003, 2019, 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 "NetworkInterface.h"
#include "java_net_NetworkInterface.h"
/*
* Windows implementation of the java.net.NetworkInterface native methods.
* This module provides the implementations of getAll, getByName, getByIndex,
* and getByAddress.
*/
extern int enumAddresses_win_ipaddrtable(JNIEnv *env, netif *netifP, netaddr **netaddrPP, MIB_IPADDRTABLE *tableP);
extern int enumAddresses_win(JNIEnv *env, netif *netifP, netaddr **netaddrPP);
extern int lookupIPAddrTable(JNIEnv *env, MIB_IPADDRTABLE **tablePP);
int getAddrsFromAdapter(IP_ADAPTER_ADDRESSES *ptr, netaddr **netaddrPP);
#ifdef DEBUG
void printnif (netif *nif) {
#ifdef _WIN64
printf ("nif:0x%I64x name:%s\n", (UINT_PTR)nif, nif->name);
#else
printf ("nif:0x%x name:%s\n", (UINT_PTR)nif, nif->name);
#endif
if (nif->dNameIsUnicode) {
printf ("dName:%S index:%d ", (unsigned short *)nif->displayName,
nif->index);
} else {
printf ("dName:%s index:%d ", nif->displayName, nif->index);
}
printf ("naddrs:%d\n", nif->naddrs);
}
void printnifs (netif *netifPP, char *str) {
netif *nif;
printf ("%s\n", str);
for (nif=netifPP; nif!=NULL; nif=nif->next) {
printnif (nif);
}
printf("-----------------\n");
}
#endif
const ULONG BUFF_SIZE = 15360;
const int MAX_TRIES = 3;
/*
* return an array of IP_ADAPTER_ADDRESSES containing one element
* for each adapter on the system. Returned in *adapters.
* Buffer is malloc'd and must be freed (unless error returned)
*/
static int getAdapters (JNIEnv *env, IP_ADAPTER_ADDRESSES **adapters) {
DWORD ret, flags;
IP_ADAPTER_ADDRESSES *adapterInfo;
ULONG len;
int try;
adapterInfo = (IP_ADAPTER_ADDRESSES *) malloc(BUFF_SIZE);
if (adapterInfo == NULL) {
JNU_ThrowByName(env, "java/lang/OutOfMemoryError",
"Native heap allocation failure");
return -1;
}
len = BUFF_SIZE;
flags = GAA_FLAG_SKIP_DNS_SERVER;
flags |= GAA_FLAG_SKIP_MULTICAST;
flags |= GAA_FLAG_INCLUDE_PREFIX;
ret = GetAdaptersAddresses(AF_UNSPEC, flags, NULL, adapterInfo, &len);
for (try = 0; ret == ERROR_BUFFER_OVERFLOW && try < MAX_TRIES; ++try) {
IP_ADAPTER_ADDRESSES * newAdapterInfo = NULL;
if (len < (ULONG_MAX - BUFF_SIZE)) {
len += BUFF_SIZE;
}
newAdapterInfo =
(IP_ADAPTER_ADDRESSES *) realloc (adapterInfo, len);
if (newAdapterInfo == NULL) {
free(adapterInfo);
JNU_ThrowByName(env, "java/lang/OutOfMemoryError",
"Native heap allocation failure");
return -1;
}
adapterInfo = newAdapterInfo;
ret = GetAdaptersAddresses(AF_UNSPEC, flags, NULL, adapterInfo, &len);
}
if (ret != ERROR_SUCCESS) {
free (adapterInfo);
if (ret == ERROR_INSUFFICIENT_BUFFER) {
JNU_ThrowByName(env, "java/lang/Error",
"IP Helper Library GetAdaptersAddresses function failed "
"with ERROR_INSUFFICIENT_BUFFER");
} else if (ret == ERROR_ADDRESS_NOT_ASSOCIATED ) {
JNU_ThrowByName(env, "java/lang/Error",
"IP Helper Library GetAdaptersAddresses function failed "
"with ERROR_ADDRESS_NOT_ASSOCIATED");
} else {
char error_msg_buf[100];
int _sr;
_sr = _snprintf_s(error_msg_buf, sizeof(error_msg_buf),
_TRUNCATE, "IP Helper Library GetAdaptersAddresses "
"function failed with error == %d", ret);
if (_sr != -1) {
JNU_ThrowByName(env, "java/lang/Error", error_msg_buf);
} else {
JNU_ThrowByName(env, "java/lang/Error",
"IP Helper Library GetAdaptersAddresses function failure");
}
}
return -1;
}
*adapters = adapterInfo;
return ERROR_SUCCESS;
}
/*
* return an array of IP_ADAPTER_ADDRESSES containing one element
* for each adapter on the system. Returned in *adapters.
* Buffer is malloc'd and must be freed (unless error returned)
*/
IP_ADAPTER_ADDRESSES *getAdapter (JNIEnv *env, jint index) {
DWORD flags, val;
IP_ADAPTER_ADDRESSES *adapterInfo, *ptr, *ret;
ULONG len;
int try;
adapterInfo = (IP_ADAPTER_ADDRESSES *) malloc(BUFF_SIZE);
if (adapterInfo == NULL) {
JNU_ThrowByName(env, "java/lang/OutOfMemoryError",
"Native heap allocation failure");
return NULL;
}
len = BUFF_SIZE;
flags = GAA_FLAG_SKIP_DNS_SERVER;
flags |= GAA_FLAG_SKIP_MULTICAST;
flags |= GAA_FLAG_INCLUDE_PREFIX;
val = GetAdaptersAddresses(AF_UNSPEC, flags, NULL, adapterInfo, &len);
for (try = 0; val == ERROR_BUFFER_OVERFLOW && try < MAX_TRIES; ++try) {
IP_ADAPTER_ADDRESSES * newAdapterInfo = NULL;
if (len < (ULONG_MAX - BUFF_SIZE)) {
len += BUFF_SIZE;
}
newAdapterInfo =
(IP_ADAPTER_ADDRESSES *) realloc (adapterInfo, len);
if (newAdapterInfo == NULL) {
free(adapterInfo);
JNU_ThrowByName(env, "java/lang/OutOfMemoryError",
"Native heap allocation failure");
return NULL;
}
adapterInfo = newAdapterInfo;
val = GetAdaptersAddresses(AF_UNSPEC, flags, NULL, adapterInfo, &len);
}
if (val != ERROR_SUCCESS) {
free (adapterInfo);
if (val == ERROR_INSUFFICIENT_BUFFER) {
JNU_ThrowByName(env, "java/lang/Error",
"IP Helper Library GetAdaptersAddresses function failed "
"with ERROR_INSUFFICIENT_BUFFER");
} else if (val == ERROR_ADDRESS_NOT_ASSOCIATED ) {
JNU_ThrowByName(env, "java/lang/Error",
"IP Helper Library GetAdaptersAddresses function failed "
"with ERROR_ADDRESS_NOT_ASSOCIATED");
} else {
char error_msg_buf[100];
int _sr;
_sr = _snprintf_s(error_msg_buf, sizeof(error_msg_buf),
_TRUNCATE, "IP Helper Library GetAdaptersAddresses function failed "
"with error == %d", val);
if (_sr != -1) {
JNU_ThrowByName(env, "java/lang/Error", error_msg_buf);
} else {
JNU_ThrowByName(env, "java/lang/Error",
"IP Helper Library GetAdaptersAddresses function failure");
}
}
return NULL;
}
ptr = adapterInfo;
ret = NULL;
while (ptr != NULL) {
// in theory the IPv4 index and the IPv6 index can be the same
// where an interface is enabled for v4 and v6
// IfIndex == 0 IPv4 not available on this interface
// Ipv6IfIndex == 0 IPv6 not available on this interface
if (((ptr->IfIndex != 0)&&(ptr->IfIndex == index)) ||
((ptr->Ipv6IfIndex !=0) && (ptr->Ipv6IfIndex == index))) {
ret = (IP_ADAPTER_ADDRESSES *) malloc(sizeof(IP_ADAPTER_ADDRESSES));
if (ret == NULL) {
free(adapterInfo);
JNU_ThrowByName(env, "java/lang/OutOfMemoryError",
"Native heap allocation failure");
return NULL;
}
//copy the memory and break out of the while loop.
memcpy(ret, ptr, sizeof(IP_ADAPTER_ADDRESSES));
break;
}
ptr=ptr->Next;
}
free(adapterInfo);
return ret;
}
static int ipinflen = 2048;
/*
*/
int getAllInterfacesAndAddresses (JNIEnv *env, netif **netifPP)
{
DWORD ret;
MIB_IPADDRTABLE *tableP;
IP_ADAPTER_ADDRESSES *ptr, *adapters=NULL;
ULONG len=ipinflen, count=0;
netif *nif=NULL, *dup_nif, *last=NULL, *loopif=NULL, *curr;
int tun=0, net=0;
*netifPP = NULL;
/*
* Get the IPv4 interfaces. This information is the same
* as what previous JDK versions would return.
*/
ret = enumInterfaces(env, netifPP);
if (ret == -1) {
return -1;
} else if( ret == -2){
if ((*env)->ExceptionCheck(env)) {
(*env)->ExceptionClear(env);
}
} else {
count = ret;
}
/* locate the loopback (and the last) interface */
for (nif=*netifPP, last=nif; nif!=NULL; nif=nif->next) {
if (nif->ifType == MIB_IF_TYPE_LOOPBACK) {
loopif = nif;
}
last = nif;
}
// Retrieve IPv4 addresses with the IP Helper API
curr = *netifPP;
ret = lookupIPAddrTable(env, &tableP);
if (ret < 0) {
return -1;
}
while (curr != NULL) {
netaddr *netaddrP;
ret = enumAddresses_win_ipaddrtable(env, curr, &netaddrP, tableP);
if (ret == -1) {
free(tableP);
return -1;
} else if (ret == -2) {
if ((*env)->ExceptionCheck(env)) {
(*env)->ExceptionClear(env);
}
break;
} else{
curr->addrs = netaddrP;
curr->naddrs += ret;
curr = curr->next;
}
}
free(tableP);
ret = getAdapters (env, &adapters);
if (ret != ERROR_SUCCESS) {
goto err;
}
/* Now get the IPv6 information. This includes:
* (a) IPv6 information associated with interfaces already found
* (b) IPv6 information for IPv6 only interfaces (probably tunnels)
*
* For compatibility with previous releases we use the naming
* information gotten from enumInterfaces() for (a) entries
* However, the index numbers are taken from the new API.
*
* The procedure is to go through the list of adapters returned
* by the new API looking for entries that correspond to IPv4 interfaces
* already found.
*/
ptr = adapters;
while (ptr != NULL) {
int c;
netif *nif0;
if (ptr->IfType == IF_TYPE_SOFTWARE_LOOPBACK && (loopif != NULL)) {
c = getAddrsFromAdapter(ptr, &loopif->addrs);
if (c == -1) {
goto err;
}
loopif->naddrs += c;
loopif->ipv6Index = ptr->Ipv6IfIndex;
} else {
int index = ptr->IfIndex;
if (index != 0) {
/* This entry is associated with an IPv4 interface */
for (nif=*netifPP; nif!=NULL; nif=nif->next) {
if (nif->index == index) {
/* found the interface entry
* set the index to the IPv6 index and add the
* IPv6 addresses
*/
nif->ipv6Index = ptr->Ipv6IfIndex;
c = getAddrsFromAdapter(ptr, &nif->addrs);
nif->naddrs += c;
break;
}
}
} else {
/* This entry is IPv6 only */
char newname [128];
int c;
/* Windows allocates duplicate adapter entries
* for tunnel interfaces when there are multiple
* physical adapters. Need to check
* if this is a duplicate (ipv6Index is the same)
*/
dup_nif = 0;
for (nif0=*netifPP; nif0!=NULL; nif0=nif0->next) {
if (nif0->hasIpv6Address &&
ptr->Ipv6IfIndex == nif0->ipv6Index) {
dup_nif = nif0;
break;
}
}
if (dup_nif == 0) {
/* new interface */
nif = (netif *) calloc (1, sizeof(netif));
if (nif == 0) {
goto err;
}
if (ptr->IfType == IF_TYPE_TUNNEL) {
sprintf (newname, "tun%d", tun);
tun ++;
} else {
sprintf (newname, "net%d", net);
net ++;
}
nif->name = malloc (strlen(newname)+1);
nif->displayName = malloc (wcslen(ptr->FriendlyName)*2+2);
if (nif->name == 0 || nif->displayName == 0) {
goto err;
}
strcpy (nif->name, newname);
wcscpy ((PWCHAR)nif->displayName, ptr->FriendlyName);
nif->dNameIsUnicode = TRUE;
// the java.net.NetworkInterface abstraction only has index
// so the Ipv6IfIndex needs to map onto index
nif->index = ptr->Ipv6IfIndex;
nif->ipv6Index = ptr->Ipv6IfIndex;
nif->hasIpv6Address = TRUE;
last->next = nif;
last = nif;
count++;
c = getAddrsFromAdapter(ptr, &nif->addrs);
if (c == -1) {
goto err;
}
nif->naddrs += c;
} else {
/* add the addresses from this adapter to the
* original (dup_nif)
*/
c = getAddrsFromAdapter(ptr, &dup_nif->addrs);
if (c == -1) {
goto err;
}
dup_nif->naddrs += c;
}
}
}
ptr=ptr->Next;
}
free (adapters);
return count;
err:
if (*netifPP) {
free_netif (*netifPP);
}
if (adapters) {
free (adapters);
}
return -1;
}
/* If *netaddrPP is null, then the addresses are allocated and the beginning
* of the allocated chain is returned in *netaddrPP.
* If *netaddrPP is not null, then the addresses allocated here are appended
* to the existing chain.
*
* Returns count of addresses or -1 on error.
*/
static int getAddrsFromAdapter(IP_ADAPTER_ADDRESSES *ptr, netaddr **netaddrPP) {
LPSOCKADDR sock;
int count = 0;
netaddr *curr, *start = NULL, *prev = NULL;
PIP_ADAPTER_UNICAST_ADDRESS uni_addr;
PIP_ADAPTER_ANYCAST_ADDRESS any_addr;
PIP_ADAPTER_PREFIX prefix;
/* If chain passed in, find end */
if (*netaddrPP != NULL) {
for (start=*netaddrPP; start->next!=NULL; start=start->next)
;
prev=start;
}
prefix = ptr->FirstPrefix;
/* Unicast */
uni_addr = ptr->FirstUnicastAddress;
while (uni_addr != NULL) {
/* address is only usable if dad state is preferred or deprecated */
if (uni_addr->DadState == IpDadStateDeprecated ||
uni_addr->DadState == IpDadStatePreferred) {
sock = uni_addr->Address.lpSockaddr;
// IPv4 addresses already retrieved with enumAddresses_win
if (sock->sa_family == AF_INET) {
uni_addr = uni_addr->Next;
continue;
}
curr = (netaddr *)calloc (1, sizeof (netaddr));
if (curr == NULL)
goto freeAllocatedMemory;
if (start == NULL)
start = curr;
if (prev != NULL)
prev->next = curr;
prev = curr;
SOCKETADDRESS_COPY (&curr->addr, sock);
if (prefix != NULL) {
curr->mask = (short)prefix->PrefixLength;
prefix = prefix->Next;
}
count ++;
}
uni_addr = uni_addr->Next;
}
/* Anycast */
any_addr = ptr->FirstAnycastAddress;
while (any_addr != NULL) {
curr = (netaddr *)calloc (1, sizeof (netaddr));
if (curr == NULL)
goto freeAllocatedMemory;
if (start == NULL)
start = curr;
if (prev != NULL)
prev->next = curr;
prev = curr;
sock = any_addr->Address.lpSockaddr;
SOCKETADDRESS_COPY (&curr->addr, sock);
count ++;
any_addr = any_addr->Next;
}
if (*netaddrPP == NULL) {
*netaddrPP = start;
}
return count;
freeAllocatedMemory:
if (*netaddrPP != NULL) {
//N.B. the variable "start" cannot be NULL at this point because we started with an
//existing list.
curr=start->next;
start->next = NULL;
start = curr;
}
// otherwise, "start" points to the beginning of an incomplete list that we must deallocate.
while (start != NULL) {
curr = start->next;
free(start);
start = curr;
}
return -1;
}
/*
* Create a NetworkInterface object, populate the name and index, and
* populate the InetAddress array based on the IP addresses for this
* interface.
*/
static jobject createNetworkInterfaceXP(JNIEnv *env, netif *ifs)
{
jobject netifObj;
jobject name, displayName;
jobjectArray addrArr, bindsArr, childArr;
netaddr *addrs;
jint addr_index;
int netaddrCount = ifs->naddrs;
netaddr *netaddrP = ifs->addrs;
netaddr *netaddrPToFree = NULL;
jint bind_index;
/*
* Create a NetworkInterface object and populate it
*/
netifObj = (*env)->NewObject(env, ni_class, ni_ctor);
if (netifObj == NULL) {
return NULL;
}
name = (*env)->NewStringUTF(env, ifs->name);
if (name == NULL) {
return NULL;
}
if (ifs->dNameIsUnicode) {
displayName = (*env)->NewString(env, (PWCHAR)ifs->displayName,
(jsize)wcslen ((PWCHAR)ifs->displayName));
} else {
displayName = (*env)->NewStringUTF(env, ifs->displayName);
}
if (displayName == NULL) {
return NULL;
}
(*env)->SetObjectField(env, netifObj, ni_nameID, name);
(*env)->SetObjectField(env, netifObj, ni_displayNameID, displayName);
(*env)->SetIntField(env, netifObj, ni_indexID, ifs->index);
/*
* Get the IP addresses for this interface if necessary
* Note that 0 is a valid number of addresses.
*/
if (netaddrCount < 0) {
netaddrCount = enumAddresses_win(env, ifs, &netaddrPToFree);
if (netaddrCount == -1) {
return NULL;
}
if (netaddrCount == -2) {
// Clear the exception and continue.
if ((*env)->ExceptionCheck(env)) {
(*env)->ExceptionClear(env);
}
}
netaddrP = netaddrPToFree;
}
addrArr = (*env)->NewObjectArray(env, netaddrCount, ia_class, NULL);
if (addrArr == NULL) {
free_netaddr(netaddrPToFree);
return NULL;
}
bindsArr = (*env)->NewObjectArray(env, netaddrCount, ni_ibcls, NULL);
if (bindsArr == NULL) {
free_netaddr(netaddrPToFree);
return NULL;
}
addrs = netaddrP;
addr_index = 0;
bind_index = 0;
while (addrs != NULL) {
jobject iaObj, ia2Obj;
jobject ibObj = NULL;
if (addrs->addr.sa.sa_family == AF_INET) {
iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID);
if (iaObj == NULL) {
free_netaddr(netaddrPToFree);
return NULL;
}
/* default ctor will set family to AF_INET */
setInetAddress_addr(env, iaObj, ntohl(addrs->addr.sa4.sin_addr.s_addr));
if ((*env)->ExceptionCheck(env)) {
free_netaddr(netaddrPToFree);
return NULL;
}
ibObj = (*env)->NewObject(env, ni_ibcls, ni_ibctrID);
if (ibObj == NULL) {
free_netaddr(netaddrPToFree);
return NULL;
}
(*env)->SetObjectField(env, ibObj, ni_ibaddressID, iaObj);
ia2Obj = (*env)->NewObject(env, ia4_class, ia4_ctrID);
if (ia2Obj == NULL) {
free_netaddr(netaddrPToFree);
return NULL;
}
setInetAddress_addr(env, ia2Obj, ntohl(addrs->brdcast.sa4.sin_addr.s_addr));
if ((*env)->ExceptionCheck(env)) {
free_netaddr(netaddrPToFree);
return NULL;
}
(*env)->SetObjectField(env, ibObj, ni_ibbroadcastID, ia2Obj);
(*env)->SetShortField(env, ibObj, ni_ibmaskID, addrs->mask);
(*env)->SetObjectArrayElement(env, bindsArr, bind_index++, ibObj);
} else /* AF_INET6 */ {
int scope;
jboolean ret;
iaObj = (*env)->NewObject(env, ia6_class, ia6_ctrID);
if (iaObj == NULL) {
free_netaddr(netaddrPToFree);
return NULL;
}
ret = setInet6Address_ipaddress(env, iaObj, (jbyte *)&(addrs->addr.sa6.sin6_addr.s6_addr));
if (ret == JNI_FALSE) {
free_netaddr(netaddrPToFree);
return NULL;
}
scope = addrs->addr.sa6.sin6_scope_id;
if (scope != 0) { /* zero is default value, no need to set */
setInet6Address_scopeid(env, iaObj, scope);
setInet6Address_scopeifname(env, iaObj, netifObj);
}
ibObj = (*env)->NewObject(env, ni_ibcls, ni_ibctrID);
if (ibObj == NULL) {
free_netaddr(netaddrPToFree);
return NULL;
}
(*env)->SetObjectField(env, ibObj, ni_ibaddressID, iaObj);
(*env)->SetShortField(env, ibObj, ni_ibmaskID, addrs->mask);
(*env)->SetObjectArrayElement(env, bindsArr, bind_index++, ibObj);
}
(*env)->SetObjectArrayElement(env, addrArr, addr_index, iaObj);
addrs = addrs->next;
addr_index++;
}
(*env)->SetObjectField(env, netifObj, ni_addrsID, addrArr);
(*env)->SetObjectField(env, netifObj, ni_bindsID, bindsArr);
free_netaddr(netaddrPToFree);
/*
* Windows doesn't have virtual interfaces, so child array
* is always empty.
*/
childArr = (*env)->NewObjectArray(env, 0, ni_class, NULL);
if (childArr == NULL) {
return NULL;
}
(*env)->SetObjectField(env, netifObj, ni_childsID, childArr);
/* return the NetworkInterface */
return netifObj;
}
JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByName0_XP
(JNIEnv *env, jclass cls, jstring name)
{
netif *ifList, *curr;
jboolean isCopy;
const char *name_utf;
jobject netifObj = NULL;
if (getAllInterfacesAndAddresses (env, &ifList) < 0) {
return NULL;
}
/* get the name as a C string */
name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
/* Search by name */
curr = ifList;
while (curr != NULL) {
if (strcmp(name_utf, curr->name) == 0) {
break;
}
curr = curr->next;
}
/* if found create a NetworkInterface */
if (curr != NULL) {
netifObj = createNetworkInterfaceXP(env, curr);
}
/* release the UTF string */
(*env)->ReleaseStringUTFChars(env, name, name_utf);
/* release the interface list */
free_netif(ifList);
return netifObj;
}
/*
* Class: NetworkInterface
* Method: getByIndex0_XP
* Signature: (I)LNetworkInterface;
*/
JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByIndex0_XP
(JNIEnv *env, jclass cls, jint index)
{
netif *ifList, *curr;
jobject netifObj = NULL;
if (getAllInterfacesAndAddresses (env, &ifList) < 0) {
return NULL;
}
/* search by index */
curr = ifList;
while (curr != NULL) {
if (index == curr->index) {
break;
}
curr = curr->next;
}
/* if found create a NetworkInterface */
if (curr != NULL) {
netifObj = createNetworkInterfaceXP(env, curr);
}
/* release the interface list */
free_netif(ifList);
return netifObj;
}
/*
* Class: java_net_NetworkInterface
* Method: getByInetAddress0
* Signature: (Ljava/net/InetAddress;)Ljava/net/NetworkInterface;
*/
JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByInetAddress0_XP
(JNIEnv *env, jclass cls, jobject iaObj)
{
netif *ifList, *curr;
jobject netifObj = NULL;
/* get the list of interfaces */
if (getAllInterfacesAndAddresses (env, &ifList) < 0) {
return NULL;
}
/*
* Enumerate the addresses on each interface until we find a
* matching address.
*/
curr = ifList;
while (curr != NULL) {
netaddr *addrList = curr->addrs;
netaddr *addrP;
/* iterate through each address */
addrP = addrList;
while (addrP != NULL) {
if (NET_SockaddrEqualsInetAddress(env,
(struct sockaddr*)&addrP->addr, iaObj)) {
break;
}
addrP = addrP->next;
}
/*
* Address matched so create NetworkInterface for this interface
* and address list.
*/
if (addrP != NULL) {
netifObj = createNetworkInterfaceXP(env, curr);
break;
}
/* on next interface */
curr = curr->next;
}
/* release the interface list */
free_netif(ifList);
return netifObj;
}
/*
* Class: java_net_NetworkInterface
* Method: getAll
* Signature: ()[Ljava/net/NetworkInterface;
*/
JNIEXPORT jobjectArray JNICALL Java_java_net_NetworkInterface_getAll_XP
(JNIEnv *env, jclass cls)
{
int count;
netif *ifList = NULL, *curr;
jobjectArray netIFArr;
jint arr_index;
/*
* Get list of interfaces
*/
count = getAllInterfacesAndAddresses (env, &ifList);
if (count < 0) {
return NULL;
}
/* allocate a NetworkInterface array */
netIFArr = (*env)->NewObjectArray(env, count, cls, NULL);
if (netIFArr == NULL) {
free_netif(ifList);
return NULL;
}
/*
* Iterate through the interfaces, create a NetworkInterface instance
* for each array element and populate the object.
*/
curr = ifList;
arr_index = 0;
while (curr != NULL) {
jobject netifObj;
netifObj = createNetworkInterfaceXP(env, curr);
if (netifObj == NULL) {
free_netif(ifList);
return NULL;
}
/* put the NetworkInterface into the array */
(*env)->SetObjectArrayElement(env, netIFArr, arr_index++, netifObj);
curr = curr->next;
}
/* release the interface list */
free_netif(ifList);
return netIFArr;
}
/*
* Class: java_net_NetworkInterface
/**代码未完, 请加载全部代码(NowJava.com).**/
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