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third-party-mirror/openjdk/jdk25u/HEAD/./src/java.base/unix/native/libnet/NetworkInterface.c
blob: 61267ec13d5376c31b06d40865cdf66284caa261 [file]
/*
* Copyright (c) 2000, 2024, 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 <arpa/inet.h>
#include <errno.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#if defined(_AIX)
#include <netinet/in6_var.h>
#include <sys/ndd_var.h>
#include <sys/kinfo.h>
#include <strings.h>
#endif
#if defined(_ALLBSD_SOURCE)
#include <net/ethernet.h>
#include <net/if_dl.h>
#include <ifaddrs.h>
#endif
#include "net_util.h"
#include "java_net_InetAddress.h"
#if defined(__linux__)
#define _PATH_PROCNET_IFINET6 "/proc/net/if_inet6"
#endif
#ifdef LIFNAMSIZ
#define IFNAMESIZE LIFNAMSIZ
#else
#define IFNAMESIZE IFNAMSIZ
#endif
#define CHECKED_MALLOC3(_pointer, _type, _size) \
do { \
_pointer = (_type)malloc(_size); \
if (_pointer == NULL) { \
JNU_ThrowOutOfMemoryError(env, "Native heap allocation failed"); \
return ifs; /* return untouched list */ \
} \
} while(0)
typedef struct _netaddr {
struct sockaddr *addr;
struct sockaddr *brdcast;
short mask;
int family; /* to make searches simple */
struct _netaddr *next;
} netaddr;
typedef struct _netif {
char *name;
int index;
char virtual;
netaddr *addr;
struct _netif *childs;
struct _netif *next;
} netif;
/************************************************************************
* NetworkInterface
*/
#include "java_net_NetworkInterface.h"
/************************************************************************
* NetworkInterface
*/
jclass ni_class;
jfieldID ni_nameID;
jfieldID ni_indexID;
jfieldID ni_descID;
jfieldID ni_addrsID;
jfieldID ni_bindsID;
jfieldID ni_virutalID;
jfieldID ni_childsID;
jfieldID ni_parentID;
jmethodID ni_ctrID;
static jclass ni_ibcls;
static jmethodID ni_ibctrID;
static jfieldID ni_ibaddressID;
static jfieldID ni_ib4broadcastID;
static jfieldID ni_ib4maskID;
/** Private methods declarations **/
static jobject createNetworkInterface(JNIEnv *env, netif *ifs);
static int getFlags0(JNIEnv *env, jstring ifname);
static netif *enumInterfaces(JNIEnv *env);
static netif *enumIPv4Interfaces(JNIEnv *env, int sock, netif *ifs);
static netif *enumIPv6Interfaces(JNIEnv *env, int sock, netif *ifs);
static netif *addif(JNIEnv *env, int sock, const char *if_name, netif *ifs,
struct sockaddr *ifr_addrP,
struct sockaddr *ifr_broadaddrP,
int family, short prefix);
static void freeif(netif *ifs);
static int openSocket(JNIEnv *env, int proto);
static int openSocketWithFallback(JNIEnv *env, const char *ifname);
static short translateIPv4AddressToPrefix(struct sockaddr_in *addr);
static short translateIPv6AddressToPrefix(struct sockaddr_in6 *addr);
static int getIndex(int sock, const char *ifname);
static int getFlags(int sock, const char *ifname, int *flags);
static int getMacAddress(JNIEnv *env, const char *ifname,
const struct in_addr *addr, unsigned char *buf);
static int getMTU(JNIEnv *env, int sock, const char *ifname);
/******************* Java entry points *****************************/
/*
* Class: java_net_NetworkInterface
* Method: init
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_java_net_NetworkInterface_init
(JNIEnv *env, jclass cls)
{
ni_class = (*env)->FindClass(env, "java/net/NetworkInterface");
CHECK_NULL(ni_class);
ni_class = (*env)->NewGlobalRef(env, ni_class);
CHECK_NULL(ni_class);
ni_nameID = (*env)->GetFieldID(env, ni_class, "name", "Ljava/lang/String;");
CHECK_NULL(ni_nameID);
ni_indexID = (*env)->GetFieldID(env, ni_class, "index", "I");
CHECK_NULL(ni_indexID);
ni_addrsID = (*env)->GetFieldID(env, ni_class, "addrs",
"[Ljava/net/InetAddress;");
CHECK_NULL(ni_addrsID);
ni_bindsID = (*env)->GetFieldID(env, ni_class, "bindings",
"[Ljava/net/InterfaceAddress;");
CHECK_NULL(ni_bindsID);
ni_descID = (*env)->GetFieldID(env, ni_class, "displayName",
"Ljava/lang/String;");
CHECK_NULL(ni_descID);
ni_virutalID = (*env)->GetFieldID(env, ni_class, "virtual", "Z");
CHECK_NULL(ni_virutalID);
ni_childsID = (*env)->GetFieldID(env, ni_class, "childs",
"[Ljava/net/NetworkInterface;");
CHECK_NULL(ni_childsID);
ni_parentID = (*env)->GetFieldID(env, ni_class, "parent",
"Ljava/net/NetworkInterface;");
CHECK_NULL(ni_parentID);
ni_ctrID = (*env)->GetMethodID(env, ni_class, "<init>", "()V");
CHECK_NULL(ni_ctrID);
ni_ibcls = (*env)->FindClass(env, "java/net/InterfaceAddress");
CHECK_NULL(ni_ibcls);
ni_ibcls = (*env)->NewGlobalRef(env, ni_ibcls);
CHECK_NULL(ni_ibcls);
ni_ibctrID = (*env)->GetMethodID(env, ni_ibcls, "<init>", "()V");
CHECK_NULL(ni_ibctrID);
ni_ibaddressID = (*env)->GetFieldID(env, ni_ibcls, "address",
"Ljava/net/InetAddress;");
CHECK_NULL(ni_ibaddressID);
ni_ib4broadcastID = (*env)->GetFieldID(env, ni_ibcls, "broadcast",
"Ljava/net/Inet4Address;");
CHECK_NULL(ni_ib4broadcastID);
ni_ib4maskID = (*env)->GetFieldID(env, ni_ibcls, "maskLength", "S");
CHECK_NULL(ni_ib4maskID);
initInetAddressIDs(env);
}
/*
* Class: java_net_NetworkInterface
* Method: getByName0
* Signature: (Ljava/lang/String;)Ljava/net/NetworkInterface;
*/
JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByName0
(JNIEnv *env, jclass cls, jstring name)
{
netif *ifs, *curr;
jboolean isCopy;
const char* name_utf;
char *colonP;
jobject obj = NULL;
if (name != NULL) {
name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
} else {
JNU_ThrowNullPointerException(env, "network interface name is NULL");
return NULL;
}
if (name_utf == NULL) {
if (!(*env)->ExceptionCheck(env))
JNU_ThrowOutOfMemoryError(env, NULL);
return NULL;
}
ifs = enumInterfaces(env);
if (ifs == NULL) {
(*env)->ReleaseStringUTFChars(env, name, name_utf);
return NULL;
}
// search the list of interfaces based on name,
// if it is virtual sub interface search with parent first.
colonP = strchr(name_utf, ':');
size_t limit = colonP != NULL ? (size_t)(colonP - name_utf) : strlen(name_utf);
curr = ifs;
while (curr != NULL) {
if (strlen(curr->name) == limit && memcmp(name_utf, curr->name, limit) == 0) {
break;
}
curr = curr->next;
}
// search the child list
if (colonP != NULL && curr != NULL) {
curr = curr->childs;
while (curr != NULL) {
if (strcmp(name_utf, curr->name) == 0) {
break;
}
curr = curr->next;
}
}
// if found create a NetworkInterface
if (curr != NULL) {
obj = createNetworkInterface(env, curr);
}
// release the UTF string and interface list
(*env)->ReleaseStringUTFChars(env, name, name_utf);
freeif(ifs);
return obj;
}
/*
* Class: java_net_NetworkInterface
* Method: getByIndex0
* Signature: (Ljava/lang/String;)Ljava/net/NetworkInterface;
*/
JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByIndex0
(JNIEnv *env, jclass cls, jint index)
{
netif *ifs, *curr;
jobject obj = NULL;
if (index <= 0) {
return NULL;
}
ifs = enumInterfaces(env);
if (ifs == NULL) {
return NULL;
}
// search the list of interfaces based on index
curr = ifs;
while (curr != NULL) {
if (index == curr->index) {
break;
}
curr = curr->next;
}
// if found create a NetworkInterface
if (curr != NULL) {
obj = createNetworkInterface(env, curr);
}
// release the interface list
freeif(ifs);
return obj;
}
// Return the interface in ifs that iaObj is bound to, if any - otherwise NULL
static netif* find_bound_interface(JNIEnv *env, netif* ifs, jobject iaObj, int family) {
netif* curr = ifs;
while (curr != NULL) {
netaddr *addrP = curr->addr;
// iterate through each address on the interface
while (addrP != NULL) {
if (family == addrP->family) {
if (family == AF_INET) {
int address1 = htonl(
((struct sockaddr_in *)addrP->addr)->sin_addr.s_addr);
int address2 = getInetAddress_addr(env, iaObj);
if ((*env)->ExceptionCheck(env)) {
return NULL;
}
if (address1 == address2) {
return curr;
}
} else if (family == AF_INET6) {
jbyte *bytes = (jbyte *)&(
((struct sockaddr_in6*)addrP->addr)->sin6_addr);
jbyte caddr[16];
int i;
unsigned int scopeid;
getInet6Address_ipaddress(env, iaObj, (char *)caddr);
scopeid = (unsigned int)getInet6Address_scopeid(env, iaObj);
if (scopeid != 0 && scopeid != ((struct sockaddr_in6*)addrP->addr)->sin6_scope_id)
break;
i = 0;
while (i < 16) {
if (caddr[i] != bytes[i]) {
break;
}
i++;
}
if (i >= 16) {
return curr;
}
}
}
addrP = addrP->next;
}
curr = curr->next;
}
return NULL;
}
/*
* Class: java_net_NetworkInterface
* Method: boundInetAddress0
* Signature: (Ljava/net/InetAddress;)boundInetAddress;
*/
JNIEXPORT jboolean JNICALL Java_java_net_NetworkInterface_boundInetAddress0
(JNIEnv *env, jclass cls, jobject iaObj)
{
netif *ifs = NULL;
jboolean bound = JNI_FALSE;
int sock;
int family = getInetAddress_family(env, iaObj);
JNU_CHECK_EXCEPTION_RETURN(env, JNI_FALSE);
if (family == java_net_InetAddress_IPv4) {
family = AF_INET;
} else if (family == java_net_InetAddress_IPv6) {
family = AF_INET6;
} else {
return JNI_FALSE; // Invalid family
}
if (family == AF_INET) {
sock = openSocket(env, AF_INET);
if (sock < 0 && (*env)->ExceptionCheck(env)) {
return JNI_FALSE;
}
// enumerate IPv4 addresses
if (sock >= 0) {
ifs = enumIPv4Interfaces(env, sock, ifs);
close(sock);
if ((*env)->ExceptionCheck(env)) {
goto cleanup;
}
}
if (find_bound_interface(env, ifs, iaObj, family) != NULL)
bound = JNI_TRUE;
} else if (ipv6_available()) {
// If IPv6 is available then enumerate IPv6 addresses.
// User can disable ipv6 explicitly by -Djava.net.preferIPv4Stack=true,
// so we have to call ipv6_available()
sock = openSocket(env, AF_INET6);
if (sock < 0) {
return JNI_FALSE;
}
ifs = enumIPv6Interfaces(env, sock, ifs);
close(sock);
if ((*env)->ExceptionCheck(env)) {
goto cleanup;
}
if (find_bound_interface(env, ifs, iaObj, family) != NULL)
bound = JNI_TRUE;
}
cleanup:
freeif(ifs);
return bound;
}
/*
* Class: java_net_NetworkInterface
* Method: getByInetAddress0
* Signature: (Ljava/net/InetAddress;)Ljava/net/NetworkInterface;
*/
JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByInetAddress0
(JNIEnv *env, jclass cls, jobject iaObj)
{
netif *ifs, *curr;
jobject obj = NULL;
int family = getInetAddress_family(env, iaObj);
JNU_CHECK_EXCEPTION_RETURN(env, NULL);
if (family == java_net_InetAddress_IPv4) {
family = AF_INET;
} else if (family == java_net_InetAddress_IPv6) {
family = AF_INET6;
} else {
return NULL; // Invalid family
}
ifs = enumInterfaces(env);
if (ifs == NULL) {
return NULL;
}
curr = find_bound_interface(env, ifs, iaObj, family);
// if found create a NetworkInterface
if (curr != NULL) {
obj = createNetworkInterface(env, curr);
}
// release the interface list
freeif(ifs);
return obj;
}
/*
* Class: java_net_NetworkInterface
* Method: getAll
* Signature: ()[Ljava/net/NetworkInterface;
*/
JNIEXPORT jobjectArray JNICALL Java_java_net_NetworkInterface_getAll
(JNIEnv *env, jclass cls)
{
netif *ifs, *curr;
jobjectArray netIFArr;
jint arr_index, ifCount;
ifs = enumInterfaces(env);
if (ifs == NULL) {
return NULL;
}
// count the interfaces
ifCount = 0;
curr = ifs;
while (curr != NULL) {
ifCount++;
curr = curr->next;
}
// allocate a NetworkInterface array
netIFArr = (*env)->NewObjectArray(env, ifCount, cls, NULL);
if (netIFArr == NULL) {
freeif(ifs);
return NULL;
}
// iterate through the interfaces, create a NetworkInterface instance
// for each array element and populate the object
curr = ifs;
arr_index = 0;
while (curr != NULL) {
jobject netifObj;
netifObj = createNetworkInterface(env, curr);
if (netifObj == NULL) {
freeif(ifs);
return NULL;
}
// put the NetworkInterface into the array
(*env)->SetObjectArrayElement(env, netIFArr, arr_index++, netifObj);
(*env)->DeleteLocalRef(env, netifObj);
curr = curr->next;
}
// release the interface list
freeif(ifs);
return netIFArr;
}
/*
* Class: java_net_NetworkInterface
* Method: isUp0
* Signature: (Ljava/lang/String;I)Z
*/
JNIEXPORT jboolean JNICALL Java_java_net_NetworkInterface_isUp0
(JNIEnv *env, jclass cls, jstring name, jint index)
{
int ret = getFlags0(env, name);
return ((ret & IFF_UP) && (ret & IFF_RUNNING)) ? JNI_TRUE : JNI_FALSE;
}
/*
* Class: java_net_NetworkInterface
* Method: isP2P0
* Signature: (Ljava/lang/String;I)Z
*/
JNIEXPORT jboolean JNICALL Java_java_net_NetworkInterface_isP2P0
(JNIEnv *env, jclass cls, jstring name, jint index)
{
int ret = getFlags0(env, name);
return (ret & IFF_POINTOPOINT) ? JNI_TRUE : JNI_FALSE;
}
/*
* Class: java_net_NetworkInterface
* Method: isLoopback0
* Signature: (Ljava/lang/String;I)Z
*/
JNIEXPORT jboolean JNICALL Java_java_net_NetworkInterface_isLoopback0
(JNIEnv *env, jclass cls, jstring name, jint index)
{
int ret = getFlags0(env, name);
return (ret & IFF_LOOPBACK) ? JNI_TRUE : JNI_FALSE;
}
/*
* Class: java_net_NetworkInterface
* Method: supportsMulticast0
* Signature: (Ljava/lang/String;I)Z
*/
JNIEXPORT jboolean JNICALL Java_java_net_NetworkInterface_supportsMulticast0
(JNIEnv *env, jclass cls, jstring name, jint index)
{
int ret = getFlags0(env, name);
return (ret & IFF_MULTICAST) ? JNI_TRUE : JNI_FALSE;
}
/*
* Class: java_net_NetworkInterface
* Method: getMacAddr0
* Signature: ([bLjava/lang/String;I)[b
*/
JNIEXPORT jbyteArray JNICALL Java_java_net_NetworkInterface_getMacAddr0
(JNIEnv *env, jclass cls, jbyteArray addrArray, jstring name, jint index)
{
jint addr;
jbyte caddr[4];
struct in_addr iaddr;
jbyteArray ret = NULL;
unsigned char mac[16];
int len;
jboolean isCopy;
const char *name_utf;
if (name != NULL) {
name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
} else {
JNU_ThrowNullPointerException(env, "network interface name is NULL");
return NULL;
}
if (name_utf == NULL) {
if (!(*env)->ExceptionCheck(env))
JNU_ThrowOutOfMemoryError(env, NULL);
return NULL;
}
if (!IS_NULL(addrArray)) {
(*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr);
addr = ((caddr[0]<<24) & 0xff000000);
addr |= ((caddr[1] <<16) & 0xff0000);
addr |= ((caddr[2] <<8) & 0xff00);
addr |= (caddr[3] & 0xff);
iaddr.s_addr = htonl(addr);
len = getMacAddress(env, name_utf, &iaddr, mac);
} else {
len = getMacAddress(env, name_utf, NULL, mac);
}
if (len > 0) {
ret = (*env)->NewByteArray(env, len);
if (!IS_NULL(ret)) {
(*env)->SetByteArrayRegion(env, ret, 0, len, (jbyte *)(mac));
}
}
// release the UTF string and interface list
(*env)->ReleaseStringUTFChars(env, name, name_utf);
return ret;
}
/*
* Class: java_net_NetworkInterface
* Method: getMTU0
* Signature: ([bLjava/lang/String;I)I
*/
JNIEXPORT jint JNICALL Java_java_net_NetworkInterface_getMTU0
(JNIEnv *env, jclass cls, jstring name, jint index)
{
jboolean isCopy;
int sock, ret = -1;
const char* name_utf = NULL;
if (name != NULL) {
name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
} else {
JNU_ThrowNullPointerException(env, "network interface name is NULL");
return ret;
}
if (name_utf == NULL) {
if (!(*env)->ExceptionCheck(env))
JNU_ThrowOutOfMemoryError(env, NULL);
return ret;
}
if ((sock = openSocketWithFallback(env, name_utf)) < 0) {
(*env)->ReleaseStringUTFChars(env, name, name_utf);
return JNI_FALSE;
}
ret = getMTU(env, sock, name_utf);
(*env)->ReleaseStringUTFChars(env, name, name_utf);
close(sock);
return ret;
}
/*** Private methods definitions ****/
static int getFlags0(JNIEnv *env, jstring name) {
jboolean isCopy;
int ret, sock, flags = 0;
const char *name_utf;
if (name != NULL) {
name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
} else {
JNU_ThrowNullPointerException(env, "network interface name is NULL");
return -1;
}
if (name_utf == NULL) {
if (!(*env)->ExceptionCheck(env))
JNU_ThrowOutOfMemoryError(env, NULL);
return -1;
}
if ((sock = openSocketWithFallback(env, name_utf)) < 0) {
(*env)->ReleaseStringUTFChars(env, name, name_utf);
return -1;
}
ret = getFlags(sock, name_utf, &flags);
close(sock);
(*env)->ReleaseStringUTFChars(env, name, name_utf);
if (ret < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "getFlags() failed");
return -1;
}
return flags;
}
/*
* Creates a NetworkInterface object, populates the name, the index, and
* populates the InetAddress array based on the IP addresses for this
* interface.
*/
static jobject createNetworkInterface(JNIEnv *env, netif *ifs) {
jobject netifObj;
jobject name;
jobjectArray addrArr;
jobjectArray bindArr;
jobjectArray childArr;
jint addr_index, addr_count, bind_index;
jint child_count, child_index;
netaddr *addrP;
netif *childP;
jobject tmp;
// create a NetworkInterface object and populate it
netifObj = (*env)->NewObject(env, ni_class, ni_ctrID);
CHECK_NULL_RETURN(netifObj, NULL);
name = (*env)->NewStringUTF(env, ifs->name);
CHECK_NULL_RETURN(name, NULL);
(*env)->SetObjectField(env, netifObj, ni_nameID, name);
(*env)->SetObjectField(env, netifObj, ni_descID, name);
(*env)->SetIntField(env, netifObj, ni_indexID, ifs->index);
(*env)->SetBooleanField(env, netifObj, ni_virutalID,
ifs->virtual ? JNI_TRUE : JNI_FALSE);
// count the number of addresses on this interface
addr_count = 0;
addrP = ifs->addr;
while (addrP != NULL) {
addr_count++;
addrP = addrP->next;
}
// create the array of InetAddresses
addrArr = (*env)->NewObjectArray(env, addr_count, ia_class, NULL);
if (addrArr == NULL) {
return NULL;
}
bindArr = (*env)->NewObjectArray(env, addr_count, ni_ibcls, NULL);
if (bindArr == NULL) {
return NULL;
}
addrP = ifs->addr;
addr_index = 0;
bind_index = 0;
while (addrP != NULL) {
jobject iaObj = NULL;
jobject ibObj = NULL;
if (addrP->family == AF_INET) {
iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID);
if (iaObj) {
setInetAddress_addr(env, iaObj, htonl(
((struct sockaddr_in*)addrP->addr)->sin_addr.s_addr));
JNU_CHECK_EXCEPTION_RETURN(env, NULL);
} else {
return NULL;
}
ibObj = (*env)->NewObject(env, ni_ibcls, ni_ibctrID);
if (ibObj) {
(*env)->SetObjectField(env, ibObj, ni_ibaddressID, iaObj);
if (addrP->brdcast) {
jobject ia2Obj = NULL;
ia2Obj = (*env)->NewObject(env, ia4_class, ia4_ctrID);
if (ia2Obj) {
setInetAddress_addr(env, ia2Obj, htonl(
((struct sockaddr_in*)addrP->brdcast)->sin_addr.s_addr));
JNU_CHECK_EXCEPTION_RETURN(env, NULL);
(*env)->SetObjectField(env, ibObj, ni_ib4broadcastID, ia2Obj);
(*env)->DeleteLocalRef(env, ia2Obj);
} else {
return NULL;
}
}
(*env)->SetShortField(env, ibObj, ni_ib4maskID, addrP->mask);
(*env)->SetObjectArrayElement(env, bindArr, bind_index++, ibObj);
(*env)->DeleteLocalRef(env, ibObj);
} else {
return NULL;
}
}
if (addrP->family == AF_INET6) {
int scope=0;
iaObj = (*env)->NewObject(env, ia6_class, ia6_ctrID);
if (iaObj) {
jboolean ret = setInet6Address_ipaddress(env, iaObj,
(char *)&(((struct sockaddr_in6*)addrP->addr)->sin6_addr));
if (ret == JNI_FALSE) {
return NULL;
}
scope = ((struct sockaddr_in6*)addrP->addr)->sin6_scope_id;
if (scope != 0) { /* zero is default value, no need to set */
setInet6Address_scopeid(env, iaObj, scope);
setInet6Address_scopeifname(env, iaObj, netifObj);
}
} else {
return NULL;
}
ibObj = (*env)->NewObject(env, ni_ibcls, ni_ibctrID);
if (ibObj) {
(*env)->SetObjectField(env, ibObj, ni_ibaddressID, iaObj);
(*env)->SetShortField(env, ibObj, ni_ib4maskID, addrP->mask);
(*env)->SetObjectArrayElement(env, bindArr, bind_index++, ibObj);
(*env)->DeleteLocalRef(env, ibObj);
} else {
return NULL;
}
}
(*env)->SetObjectArrayElement(env, addrArr, addr_index++, iaObj);
(*env)->DeleteLocalRef(env, iaObj);
addrP = addrP->next;
}
// see if there is any virtual interface attached to this one.
child_count = 0;
childP = ifs->childs;
while (childP) {
child_count++;
childP = childP->next;
}
childArr = (*env)->NewObjectArray(env, child_count, ni_class, NULL);
if (childArr == NULL) {
return NULL;
}
// create the NetworkInterface instances for the sub-interfaces as well
child_index = 0;
childP = ifs->childs;
while(childP) {
tmp = createNetworkInterface(env, childP);
if (tmp == NULL) {
return NULL;
}
(*env)->SetObjectField(env, tmp, ni_parentID, netifObj);
(*env)->SetObjectArrayElement(env, childArr, child_index++, tmp);
childP = childP->next;
}
(*env)->SetObjectField(env, netifObj, ni_addrsID, addrArr);
(*env)->SetObjectField(env, netifObj, ni_bindsID, bindArr);
(*env)->SetObjectField(env, netifObj, ni_childsID, childArr);
(*env)->DeleteLocalRef(env, name);
(*env)->DeleteLocalRef(env, addrArr);
(*env)->DeleteLocalRef(env, bindArr);
(*env)->DeleteLocalRef(env, childArr);
// return the NetworkInterface
return netifObj;
}
/*
* Enumerates all interfaces
*/
static netif *enumInterfaces(JNIEnv *env) {
netif *ifs = NULL;
int sock;
sock = openSocket(env, AF_INET);
if (sock < 0 && (*env)->ExceptionCheck(env)) {
return NULL;
}
// enumerate IPv4 addresses
if (sock >= 0) {
ifs = enumIPv4Interfaces(env, sock, ifs);
close(sock);
if ((*env)->ExceptionCheck(env)) {
freeif(ifs);
return NULL;
}
}
// If IPv6 is available then enumerate IPv6 addresses.
// User can disable ipv6 explicitly by -Djava.net.preferIPv4Stack=true,
// so we have to call ipv6_available()
if (ipv6_available()) {
sock = openSocket(env, AF_INET6);
if (sock < 0) {
freeif(ifs);
return NULL;
}
ifs = enumIPv6Interfaces(env, sock, ifs);
close(sock);
if ((*env)->ExceptionCheck(env)) {
freeif(ifs);
return NULL;
}
}
return ifs;
}
/*
* Frees an interface list (including any attached addresses).
*/
static void freeif(netif *ifs) {
netif *currif = ifs;
while (currif != NULL) {
netaddr *addrP = currif->addr;
while (addrP != NULL) {
netaddr *next = addrP->next;
free(addrP);
addrP = next;
}
// don't forget to free the sub-interfaces
if (currif->childs != NULL) {
freeif(currif->childs);
}
ifs = currif->next;
free(currif);
currif = ifs;
}
}
static netif *addif(JNIEnv *env, int sock, const char *if_name, netif *ifs,
struct sockaddr *ifr_addrP,
struct sockaddr *ifr_broadaddrP,
int family, short prefix)
{
netif *currif = ifs, *parent;
netaddr *addrP;
char name[IFNAMESIZE], vname[IFNAMESIZE];
char *name_colonP;
int isVirtual = 0;
int addr_size;
// If the interface name is a logical interface then we remove the unit
// number so that we have the physical interface (eg: hme0:1 -> hme0).
// NetworkInterface currently doesn't have any concept of physical vs.
// logical interfaces.
strncpy(name, if_name, IFNAMESIZE);
name[IFNAMESIZE - 1] = '\0';
*vname = 0;
// Create and populate the netaddr node. If allocation fails
// return an un-updated list.
// Allocate for addr and brdcast at once
addr_size = (family == AF_INET) ? sizeof(struct sockaddr_in)
: sizeof(struct sockaddr_in6);
CHECKED_MALLOC3(addrP, netaddr *, sizeof(netaddr) + 2 * addr_size);
addrP->addr = (struct sockaddr *)((char *)addrP + sizeof(netaddr));
memcpy(addrP->addr, ifr_addrP, addr_size);
addrP->family = family;
addrP->mask = prefix;
addrP->next = 0;
// for IPv4 add broadcast address
if (family == AF_INET && ifr_broadaddrP != NULL) {
addrP->brdcast = (struct sockaddr *)
((char *)addrP + sizeof(netaddr) + addr_size);
memcpy(addrP->brdcast, ifr_broadaddrP, addr_size);
} else {
addrP->brdcast = NULL;
}
// Deal with virtual interface with colon notation e.g. eth0:1
name_colonP = strchr(name, ':');
if (name_colonP != NULL) {
int flags = 0;
// This is a virtual interface. If we are able to access the parent
// we need to create a new entry if it doesn't exist yet *and* update
// the 'parent' interface with the new records.
*name_colonP = 0;
if (getFlags(sock, name, &flags) < 0 || flags < 0) {
// failed to access parent interface do not create parent.
// We are a virtual interface with no parent.
isVirtual = 1;
*name_colonP = ':';
} else {
// Got access to parent, so create it if necessary.
// Save original name to vname and truncate name by ':'
memcpy(vname, name, sizeof(vname));
vname[name_colonP - name] = ':';
}
}
// Check if this is a "new" interface. Use the interface name for
// matching because index isn't supported on Solaris 2.6 & 7.
while (currif != NULL) {
if (strcmp(name, currif->name) == 0) {
break;
}
currif = currif->next;
}
// If "new" then create a netif structure and insert it into the list.
if (currif == NULL) {
CHECKED_MALLOC3(currif, netif *, sizeof(netif) + IFNAMESIZE);
currif->name = (char *)currif + sizeof(netif);
strncpy(currif->name, name, IFNAMESIZE);
currif->name[IFNAMESIZE - 1] = '\0';
currif->index = getIndex(sock, name);
currif->addr = NULL;
currif->childs = NULL;
currif->virtual = isVirtual;
currif->next = ifs;
ifs = currif;
}
// Finally insert the address on the interface
addrP->next = currif->addr;
currif->addr = addrP;
parent = currif;
// Deal with the virtual interface now.
if (vname[0]) {
netaddr *tmpaddr;
currif = parent->childs;
while (currif != NULL) {
if (strcmp(vname, currif->name) == 0) {
break;
}
currif = currif->next;
}
if (currif == NULL) {
CHECKED_MALLOC3(currif, netif *, sizeof(netif) + IFNAMESIZE);
currif->name = (char *)currif + sizeof(netif);
strncpy(currif->name, vname, IFNAMESIZE);
currif->name[IFNAMESIZE - 1] = '\0';
currif->index = getIndex(sock, vname);
currif->addr = NULL; // Need to duplicate the addr entry?
currif->virtual = 1;
currif->childs = NULL;
currif->next = parent->childs;
parent->childs = currif;
}
CHECKED_MALLOC3(tmpaddr, netaddr *, sizeof(netaddr) + 2 * addr_size);
memcpy(tmpaddr, addrP, sizeof(netaddr));
if (addrP->addr != NULL) {
tmpaddr->addr = (struct sockaddr *)
((char*)tmpaddr + sizeof(netaddr));
memcpy(tmpaddr->addr, addrP->addr, addr_size);
}
if (addrP->brdcast != NULL) {
tmpaddr->brdcast = (struct sockaddr *)
((char *)tmpaddr + sizeof(netaddr) + addr_size);
memcpy(tmpaddr->brdcast, addrP->brdcast, addr_size);
}
tmpaddr->next = currif->addr;
currif->addr = tmpaddr;
}
return ifs;
}
/*
* Determines the prefix value for an AF_INET subnet address.
*/
static short translateIPv4AddressToPrefix(struct sockaddr_in *addr) {
short prefix = 0;
unsigned int mask;
if (addr == NULL) {
return 0;
}
mask = ntohl(addr->sin_addr.s_addr);
while (mask) {
mask <<= 1;
prefix++;
}
return prefix;
}
/*
* Determines the prefix value for an AF_INET6 subnet address.
*/
static short translateIPv6AddressToPrefix(struct sockaddr_in6 *addr) {
short prefix = 0;
u_char *addrBytes;
if (addr == NULL) {
return 0;
}
addrBytes = (u_char *)&(addr->sin6_addr);
unsigned int byte, bit;
for (byte = 0; byte < sizeof(struct in6_addr); byte++, prefix += 8) {
if (addrBytes[byte] != 0xff) {
break;
}
}
if (byte != sizeof(struct in6_addr)) {
for (bit = 7; bit != 0; bit--, prefix++) {
if (!(addrBytes[byte] & (1 << bit))) {
break;
}
}
for (; bit != 0; bit--) {
if (addrBytes[byte] & (1 << bit)) {
prefix = 0;
break;
}
}
if (prefix > 0) {
byte++;
for (; byte < sizeof(struct in6_addr); byte++) {
if (addrBytes[byte]) {
prefix = 0;
}
}
}
}
return prefix;
}
/*
* Opens a socket for further ioct calls. proto is one of AF_INET or AF_INET6.
*/
static int openSocket(JNIEnv *env, int proto) {
int sock;
if ((sock = socket(proto, SOCK_DGRAM, 0)) < 0) {
// If we lack support for this address family or protocol,
// don't throw an exception.
if (errno != EPROTONOSUPPORT && errno != EAFNOSUPPORT) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "Socket creation failed");
}
return -1;
}
return sock;
}
/** Linux **/
#if defined(__linux__)
/*
* Opens a socket for further ioctl calls. Tries AF_INET socket first and
* if it fails return AF_INET6 socket.
*/
static int openSocketWithFallback(JNIEnv *env, const char *ifname) {
int sock;
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
if (errno == EPROTONOSUPPORT || errno == EAFNOSUPPORT) {
if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "IPV6 Socket creation failed");
return -1;
}
} else { // errno is not NOSUPPORT
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "IPV4 Socket creation failed");
return -1;
}
}
// Linux starting from 2.6.? kernel allows ioctl call with either IPv4 or
// IPv6 socket regardless of type of address of an interface.
return sock;
}
/*
* Enumerates and returns all IPv4 interfaces on Linux.
*/
static netif *enumIPv4Interfaces(JNIEnv *env, int sock, netif *ifs) {
struct ifconf ifc;
struct ifreq *ifreqP;
char *buf = NULL;
unsigned i;
// do a dummy SIOCGIFCONF to determine the buffer size
// SIOCGIFCOUNT doesn't work
ifc.ifc_buf = NULL;
if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "ioctl(SIOCGIFCONF) failed");
return ifs;
}
// call SIOCGIFCONF to enumerate the interfaces
CHECKED_MALLOC3(buf, char *, ifc.ifc_len);
ifc.ifc_buf = buf;
if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "ioctl(SIOCGIFCONF) failed");
free(buf);
return ifs;
}
// iterate through each interface
ifreqP = ifc.ifc_req;
for (i = 0; i < ifc.ifc_len / sizeof(struct ifreq); i++, ifreqP++) {
struct sockaddr addr, broadaddr, *broadaddrP = NULL;
short prefix = 0;
// ignore non IPv4 addresses
if (ifreqP->ifr_addr.sa_family != AF_INET) {
continue;
}
// save socket address
memcpy(&addr, &(ifreqP->ifr_addr), sizeof(struct sockaddr));
// determine broadcast address, if applicable
if ((ioctl(sock, SIOCGIFFLAGS, ifreqP) == 0) &&
ifreqP->ifr_flags & IFF_BROADCAST) {
// restore socket address to ifreqP
memcpy(&(ifreqP->ifr_addr), &addr, sizeof(struct sockaddr));
if (ioctl(sock, SIOCGIFBRDADDR, ifreqP) == 0) {
memcpy(&broadaddr, &(ifreqP->ifr_broadaddr),
sizeof(struct sockaddr));
broadaddrP = &broadaddr;
}
}
// restore socket address to ifreqP
memcpy(&(ifreqP->ifr_addr), &addr, sizeof(struct sockaddr));
// determine netmask
if (ioctl(sock, SIOCGIFNETMASK, ifreqP) == 0) {
prefix = translateIPv4AddressToPrefix(
(struct sockaddr_in *)&(ifreqP->ifr_netmask));
}
// add interface to the list
ifs = addif(env, sock, ifreqP->ifr_name, ifs,
&addr, broadaddrP, AF_INET, prefix);
// in case of exception, free interface list and buffer and return NULL
if ((*env)->ExceptionCheck(env)) {
free(buf);
freeif(ifs);
return NULL;
}
}
// free buffer
free(buf);
return ifs;
}
/*
* Enumerates and returns all IPv6 interfaces on Linux.
*/
static netif *enumIPv6Interfaces(JNIEnv *env, int sock, netif *ifs) {
FILE *f;
char devname[21], addr6p[8][5];
int prefix, scope, dad_status, if_idx;
if ((f = fopen(_PATH_PROCNET_IFINET6, "r")) != NULL) {
while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %08x %02x %02x %02x %20s\n",
addr6p[0], addr6p[1], addr6p[2], addr6p[3],
addr6p[4], addr6p[5], addr6p[6], addr6p[7],
&if_idx, &prefix, &scope, &dad_status, devname) != EOF) {
char addr6[40];
struct sockaddr_in6 addr;
snprintf(addr6, sizeof(addr6), "%s:%s:%s:%s:%s:%s:%s:%s",
addr6p[0], addr6p[1], addr6p[2], addr6p[3],
addr6p[4], addr6p[5], addr6p[6], addr6p[7]);
memset(&addr, 0, sizeof(struct sockaddr_in6));
inet_pton(AF_INET6, addr6, (void*)addr.sin6_addr.s6_addr);
// set scope ID to interface index
addr.sin6_scope_id = if_idx;
// add interface to the list
ifs = addif(env, sock, devname, ifs, (struct sockaddr *)&addr,
NULL, AF_INET6, (short)prefix);
// if an exception occurred then return the list as is
if ((*env)->ExceptionCheck(env)) {
break;
}
}
fclose(f);
}
return ifs;
}
/*
* Try to get the interface index.
*/
static int getIndex(int sock, const char *name) {
struct ifreq if2;
memset((char *)&if2, 0, sizeof(if2));
strncpy(if2.ifr_name, name, sizeof(if2.ifr_name));
if2.ifr_name[sizeof(if2.ifr_name) - 1] = 0;
if (ioctl(sock, SIOCGIFINDEX, (char *)&if2) < 0) {
return -1;
}
return if2.ifr_ifindex;
}
/*
* Gets the Hardware address (usually MAC address) for the named interface.
* On return puts the data in buf, and returns the length, in byte, of the
* MAC address. Returns -1 if there is no hardware address on that interface.
*/
static int getMacAddress
(JNIEnv *env, const char *ifname, const struct in_addr *addr,
unsigned char *buf)
{
struct ifreq ifr;
int i, sock;
if ((sock = openSocketWithFallback(env, ifname)) < 0) {
return -1;
}
memset((char *)&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name) - 1);
if (ioctl(sock, SIOCGIFHWADDR, &ifr) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "ioctl(SIOCGIFHWADDR) failed");
close(sock);
return -1;
}
close(sock);
memcpy(buf, &ifr.ifr_hwaddr.sa_data, IFHWADDRLEN);
// all bytes to 0 means no hardware address
for (i = 0; i < IFHWADDRLEN; i++) {
if (buf[i] != 0)
return IFHWADDRLEN;
}
return -1;
}
static int getMTU(JNIEnv *env, int sock, const char *ifname) {
struct ifreq if2;
memset((char *)&if2, 0, sizeof(if2));
strncpy(if2.ifr_name, ifname, sizeof(if2.ifr_name) - 1);
if (ioctl(sock, SIOCGIFMTU, (char *)&if2) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "ioctl(SIOCGIFMTU) failed");
return -1;
}
return if2.ifr_mtu;
}
static int getFlags(int sock, const char *ifname, int *flags) {
struct ifreq if2;
memset((char *)&if2, 0, sizeof(if2));
strncpy(if2.ifr_name, ifname, sizeof(if2.ifr_name));
if2.ifr_name[sizeof(if2.ifr_name) - 1] = 0;
if (ioctl(sock, SIOCGIFFLAGS, (char *)&if2) < 0) {
return -1;
}
if (sizeof(if2.ifr_flags) == sizeof(short)) {
*flags = (if2.ifr_flags & 0xffff);
} else {
*flags = if2.ifr_flags;
}
return 0;
}
#endif /* __linux__ */
/** AIX **/
#if defined(_AIX)
/* seems getkerninfo is guarded by _KERNEL in the system headers */
/* see net/proto_uipc.h */
int getkerninfo(int, char *, int *, int32long64_t);
/*
* Opens a socket for further ioctl calls. Tries AF_INET socket first and
* if it fails return AF_INET6 socket.
*/
static int openSocketWithFallback(JNIEnv *env, const char *ifname) {
int sock;
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
if (errno == EPROTONOSUPPORT || errno == EAFNOSUPPORT) {
if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "IPV6 Socket creation failed");
return -1;
}
} else { // errno is not NOSUPPORT
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "IPV4 Socket creation failed");
return -1;
}
}
return sock;
}
/*
* Enumerates and returns all IPv4 interfaces on AIX.
*/
static netif *enumIPv4Interfaces(JNIEnv *env, int sock, netif *ifs) {
struct ifconf ifc;
struct ifreq *ifreqP;
char *buf = NULL;
unsigned i;
// call SIOCGSIZIFCONF to get the size of SIOCGIFCONF buffer
if (ioctl(sock, SIOCGSIZIFCONF, &(ifc.ifc_len)) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "ioctl(SIOCGSIZIFCONF) failed");
return ifs;
}
// call CSIOCGIFCONF instead of SIOCGIFCONF where interface
// records will always have sizeof(struct ifreq) length.
// Be aware that only IPv4 data is complete this way.
CHECKED_MALLOC3(buf, char *, ifc.ifc_len);
ifc.ifc_buf = buf;
if (ioctl(sock, CSIOCGIFCONF, (char *)&ifc) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "ioctl(CSIOCGIFCONF) failed");
free(buf);
return ifs;
}
// iterate through each interface
ifreqP = ifc.ifc_req;
for (i = 0; i < ifc.ifc_len / sizeof(struct ifreq); i++, ifreqP++) {
struct sockaddr addr, broadaddr, *broadaddrP = NULL;
short prefix = 0;
// ignore non IPv4 addresses
if (ifreqP->ifr_addr.sa_family != AF_INET) {
continue;
}
// save socket address
memcpy(&addr, &(ifreqP->ifr_addr), sizeof(struct sockaddr));
// determine broadcast address, if applicable
if ((ioctl(sock, SIOCGIFFLAGS, ifreqP) == 0) &&
ifreqP->ifr_flags & IFF_BROADCAST) {
// restore socket address to ifreqP
memcpy(&(ifreqP->ifr_addr), &addr, sizeof(struct sockaddr));
if (ioctl(sock, SIOCGIFBRDADDR, ifreqP) == 0) {
memcpy(&broadaddr, &(ifreqP->ifr_broadaddr),
sizeof(struct sockaddr));
broadaddrP = &broadaddr;
}
}
// restore socket address to ifreqP
memcpy(&(ifreqP->ifr_addr), &addr, sizeof(struct sockaddr));
// determine netmask
if (ioctl(sock, SIOCGIFNETMASK, ifreqP) == 0) {
prefix = translateIPv4AddressToPrefix(
(struct sockaddr_in *)&(ifreqP->ifr_addr));
}
// add interface to the list
ifs = addif(env, sock, ifreqP->ifr_name, ifs,
&addr, broadaddrP, AF_INET, prefix);
// in case of exception, free interface list and buffer and return NULL
if ((*env)->ExceptionCheck(env)) {
free(buf);
freeif(ifs);
return NULL;
}
}
// free buffer
free(buf);
return ifs;
}
/*
* Enumerates and returns all IPv6 interfaces on AIX.
*/
static netif *enumIPv6Interfaces(JNIEnv *env, int sock, netif *ifs) {
struct ifconf ifc;
struct ifreq *ifreqP;
char *buf, *cp, *cplimit;
// call SIOCGSIZIFCONF to get size for SIOCGIFCONF buffer
if (ioctl(sock, SIOCGSIZIFCONF, &(ifc.ifc_len)) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "ioctl(SIOCGSIZIFCONF) failed");
return ifs;
}
// call SIOCGIFCONF to enumerate the interfaces
CHECKED_MALLOC3(buf, char *, ifc.ifc_len);
ifc.ifc_buf = buf;
if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "ioctl(SIOCGIFCONF) failed");
free(buf);
return ifs;
}
// iterate through each interface
ifreqP = ifc.ifc_req;
cp = (char *)ifc.ifc_req;
cplimit = cp + ifc.ifc_len;
for (; cp < cplimit;
cp += (sizeof(ifreqP->ifr_name) +
MAX((ifreqP->ifr_addr).sa_len, sizeof(ifreqP->ifr_addr))))
{
ifreqP = (struct ifreq *)cp;
short prefix = 0;
// ignore non IPv6 addresses
if (ifreqP->ifr_addr.sa_family != AF_INET6) {
continue;
}
// determine netmask
struct in6_ifreq if6;
memset((char *)&if6, 0, sizeof(if6));
strncpy(if6.ifr_name, ifreqP->ifr_name, sizeof(if6.ifr_name) - 1);
memcpy(&(if6.ifr_Addr), &(ifreqP->ifr_addr),
sizeof(struct sockaddr_in6));
if (ioctl(sock, SIOCGIFNETMASK6, (char *)&if6) >= 0) {
prefix = translateIPv6AddressToPrefix(&(if6.ifr_Addr));
}
// set scope ID to interface index
((struct sockaddr_in6 *)&(ifreqP->ifr_addr))->sin6_scope_id =
getIndex(sock, ifreqP->ifr_name);
// add interface to the list
ifs = addif(env, sock, ifreqP->ifr_name, ifs,
(struct sockaddr *)&(ifreqP->ifr_addr),
NULL, AF_INET6, prefix);
// if an exception occurred then free the list
if ((*env)->ExceptionCheck(env)) {
free(buf);
freeif(ifs);
return NULL;
}
}
// free buffer
free(buf);
return ifs;
}
/*
* Try to get the interface index.
*/
static int getIndex(int sock, const char *name) {
int index = if_nametoindex(name);
return (index == 0) ? -1 : index;
}
/*
* Gets the Hardware address (usually MAC address) for the named interface.
* On return puts the data in buf, and returns the length, in byte, of the
* MAC address. Returns -1 if there is no hardware address on that interface.
*/
static int getMacAddress
(JNIEnv *env, const char *ifname, const struct in_addr *addr,
unsigned char *buf)
{
int size;
struct kinfo_ndd *nddp;
void *end;
size = getkerninfo(KINFO_NDD, 0, 0, 0);
if (size == 0) {
return -1;
}
if (size < 0) {
perror("getkerninfo 1");
return -1;
}
nddp = (struct kinfo_ndd *)malloc(size);
if (!nddp) {
JNU_ThrowOutOfMemoryError(env,
"Network interface getMacAddress native buffer allocation failed");
return -1;
}
if (getkerninfo(KINFO_NDD, (char*) nddp, &size, 0) < 0) {
perror("getkerninfo 2");
free(nddp);
return -1;
}
end = (void *)nddp + size;
while ((void *)nddp < end) {
if (!strcmp(nddp->ndd_alias, ifname) ||
!strcmp(nddp->ndd_name, ifname)) {
bcopy(nddp->ndd_addr, buf, 6);
free(nddp);
return 6;
} else {
nddp++;
}
}
free(nddp);
return -1;
}
static int getMTU(JNIEnv *env, int sock, const char *ifname) {
struct ifreq if2;
memset((char *)&if2, 0, sizeof(if2));
strncpy(if2.ifr_name, ifname, sizeof(if2.ifr_name) - 1);
if (ioctl(sock, SIOCGIFMTU, (char *)&if2) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "ioctl(SIOCGIFMTU) failed");
return -1;
}
return if2.ifr_mtu;
}
static int getFlags(int sock, const char *ifname, int *flags) {
struct ifreq if2;
memset((char *)&if2, 0, sizeof(if2));
strncpy(if2.ifr_name, ifname, sizeof(if2.ifr_name) - 1);
if (ioctl(sock, SIOCGIFFLAGS, (char *)&if2) < 0) {
return -1;
}
if (sizeof(if2.ifr_flags) == sizeof(short)) {
*flags = (if2.ifr_flags & 0xffff);
} else {
*flags = if2.ifr_flags;
}
return 0;
}
#endif /* _AIX */
/** BSD **/
#if defined(_ALLBSD_SOURCE)
/*
* Opens a socket for further ioctl calls. Tries AF_INET socket first and
* if it fails return AF_INET6 socket.
*/
static int openSocketWithFallback(JNIEnv *env, const char *ifname) {
int sock;
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
if (errno == EPROTONOSUPPORT || errno == EAFNOSUPPORT) {
if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "IPV6 Socket creation failed");
return -1;
}
} else { // errno is not NOSUPPORT
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "IPV4 Socket creation failed");
return -1;
}
}
return sock;
}
/*
* Enumerates and returns all IPv4 interfaces on BSD.
*/
static netif *enumIPv4Interfaces(JNIEnv *env, int sock, netif *ifs) {
struct ifaddrs *ifa, *origifa;
if (getifaddrs(&origifa) != 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "getifaddrs() failed");
return ifs;
}
for (ifa = origifa; ifa != NULL; ifa = ifa->ifa_next) {
struct sockaddr *broadaddrP = NULL;
// ignore non IPv4 addresses
if (ifa->ifa_addr == NULL || ifa->ifa_addr->sa_family != AF_INET)
continue;
// set ifa_broadaddr, if there is one
if ((ifa->ifa_flags & IFF_POINTOPOINT) == 0 &&
ifa->ifa_flags & IFF_BROADCAST) {
broadaddrP = ifa->ifa_dstaddr;
}
// add interface to the list
ifs = addif(env, sock, ifa->ifa_name, ifs, ifa->ifa_addr,
broadaddrP, AF_INET,
translateIPv4AddressToPrefix((struct sockaddr_in *)
ifa->ifa_netmask));
// if an exception occurred then free the list
if ((*env)->ExceptionCheck(env)) {
freeifaddrs(origifa);
freeif(ifs);
return NULL;
}
}
// free ifaddrs buffer
freeifaddrs(origifa);
return ifs;
}
/*
* Enumerates and returns all IPv6 interfaces on BSD.
*/
static netif *enumIPv6Interfaces(JNIEnv *env, int sock, netif *ifs) {
struct ifaddrs *ifa, *origifa;
if (getifaddrs(&origifa) != 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "getifaddrs() failed");
return ifs;
}
for (ifa = origifa; ifa != NULL; ifa = ifa->ifa_next) {
// ignore non IPv6 addresses
if (ifa->ifa_addr == NULL || ifa->ifa_addr->sa_family != AF_INET6)
continue;
// set scope ID to interface index
((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_scope_id =
getIndex(sock, ifa->ifa_name);
// add interface to the list
ifs = addif(env, sock, ifa->ifa_name, ifs, ifa->ifa_addr, NULL,
AF_INET6,
translateIPv6AddressToPrefix((struct sockaddr_in6 *)
ifa->ifa_netmask));
// if an exception occurred then free the list
if ((*env)->ExceptionCheck(env)) {
freeifaddrs(origifa);
freeif(ifs);
return NULL;
}
}
// free ifaddrs buffer
freeifaddrs(origifa);
return ifs;
}
/*
* Try to get the interface index.
*/
static int getIndex(int sock, const char *name) {
#if !defined(__FreeBSD__)
int index = if_nametoindex(name);
return (index == 0) ? -1 : index;
#else
struct ifreq if2;
memset((char *)&if2, 0, sizeof(if2));
strncpy(if2.ifr_name, name, sizeof(if2.ifr_name) - 1);
if (ioctl(sock, SIOCGIFINDEX, (char *)&if2) < 0) {
return -1;
}
return if2.ifr_index;
#endif
}
/*
* Gets the Hardware address (usually MAC address) for the named interface.
* On return puts the data in buf, and returns the length, in byte, of the
* MAC address. Returns -1 if there is no hardware address on that interface.
*/
static int getMacAddress
(JNIEnv *env, const char *ifname, const struct in_addr *addr,
unsigned char *buf)
{
struct ifaddrs *ifa0, *ifa;
struct sockaddr *saddr;
int i;
// grab the interface list
if (!getifaddrs(&ifa0)) {
// cycle through the interfaces
for (i = 0, ifa = ifa0; ifa != NULL; ifa = ifa->ifa_next, i++) {
saddr = ifa->ifa_addr;
if (saddr != NULL) {
// link layer contains the MAC address
if (saddr->sa_family == AF_LINK && !strcmp(ifname, ifa->ifa_name)) {
struct sockaddr_dl *sadl = (struct sockaddr_dl *) saddr;
// check the address has the correct length
if (sadl->sdl_alen == ETHER_ADDR_LEN) {
memcpy(buf, (sadl->sdl_data + sadl->sdl_nlen), ETHER_ADDR_LEN);
freeifaddrs(ifa0);
return ETHER_ADDR_LEN;
}
}
}
}
freeifaddrs(ifa0);
}
return -1;
}
static int getMTU(JNIEnv *env, int sock, const char *ifname) {
struct ifreq if2;
memset((char *)&if2, 0, sizeof(if2));
strncpy(if2.ifr_name, ifname, sizeof(if2.ifr_name) - 1);
if (ioctl(sock, SIOCGIFMTU, (char *)&if2) < 0) {
JNU_ThrowByNameWithMessageAndLastError
(env, JNU_JAVANETPKG "SocketException", "ioctl(SIOCGIFMTU) failed");
return -1;
}
return if2.ifr_mtu;
}
static int getFlags(int sock, const char *ifname, int *flags) {
struct ifreq if2;
memset((char *)&if2, 0, sizeof(if2));
strncpy(if2.ifr_name, ifname, sizeof(if2.ifr_name) - 1);
if (ioctl(sock, SIOCGIFFLAGS, (char *)&if2) < 0) {
return -1;
}
if (sizeof(if2.ifr_flags) == sizeof(short)) {
*flags = (if2.ifr_flags & 0xffff);
} else {
*flags = if2.ifr_flags;
}
return 0;
}
#endif /* _ALLBSD_SOURCE */