Java example source code file (NetworkInterface.c)
The NetworkInterface.c Java example source code/*
* Copyright (c) 2000, 2013, 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 <errno.h>
#include <strings.h>
#if defined(_ALLBSD_SOURCE) && defined(__OpenBSD__)
#include <sys/types.h>
#endif
#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <net/if_arp.h>
#ifdef __solaris__
#include <sys/dlpi.h>
#include <fcntl.h>
#include <stropts.h>
#include <sys/sockio.h>
#endif
#ifdef __linux__
#include <sys/ioctl.h>
#include <bits/ioctls.h>
#include <sys/utsname.h>
#include <stdio.h>
#endif
#ifdef __linux__
#define _PATH_PROCNET_IFINET6 "/proc/net/if_inet6"
#endif
#if defined(_ALLBSD_SOURCE)
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/sockio.h>
#if defined(__APPLE__)
#include <net/ethernet.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <netinet/in_var.h>
#include <ifaddrs.h>
#endif
#endif
#include "jvm.h"
#include "jni_util.h"
#include "net_util.h"
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;
jfieldID ni_defaultIndexID;
jmethodID ni_ctrID;
static jclass ni_iacls;
static jclass ni_ia4cls;
static jclass ni_ia6cls;
static jclass ni_ibcls;
static jmethodID ni_ia4ctrID;
static jmethodID ni_ia6ctrID;
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);
#ifdef AF_INET6
static netif *enumIPv6Interfaces(JNIEnv *env, int sock, netif *ifs);
#endif
static netif *addif(JNIEnv *env, int sock, const char * if_name, netif *ifs, struct sockaddr* ifr_addrP, 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 struct sockaddr *getBroadcast(JNIEnv *env, int sock, const char *name, struct sockaddr *brdcast_store);
static short getSubnet(JNIEnv *env, int sock, const char *ifname);
static int getIndex(int sock, const char *ifname);
static int getFlags(int sock, const char *ifname, int *flags);
static int getMacAddress(JNIEnv *env, int sock, const char* ifname, const struct in_addr* addr, unsigned char *buf);
static int getMTU(JNIEnv *env, int sock, const char *ifname);
#ifdef __solaris__
static netif *enumIPvXInterfaces(JNIEnv *env, int sock, netif *ifs, int family);
static int getMacFromDevice(JNIEnv *env, const char* ifname, unsigned char* retbuf);
#ifndef SIOCGLIFHWADDR
#define SIOCGLIFHWADDR _IOWR('i', 192, struct lifreq)
#endif
#endif
/******************* 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_iacls = (*env)->FindClass(env, "java/net/InetAddress");
CHECK_NULL(ni_iacls);
ni_iacls = (*env)->NewGlobalRef(env, ni_iacls);
CHECK_NULL(ni_iacls);
ni_ia4cls = (*env)->FindClass(env, "java/net/Inet4Address");
CHECK_NULL(ni_ia4cls);
ni_ia4cls = (*env)->NewGlobalRef(env, ni_ia4cls);
CHECK_NULL(ni_ia4cls);
ni_ia6cls = (*env)->FindClass(env, "java/net/Inet6Address");
CHECK_NULL(ni_ia6cls);
ni_ia6cls = (*env)->NewGlobalRef(env, ni_ia6cls);
CHECK_NULL(ni_ia6cls);
ni_ibcls = (*env)->FindClass(env, "java/net/InterfaceAddress");
CHECK_NULL(ni_ibcls);
ni_ibcls = (*env)->NewGlobalRef(env, ni_ibcls);
CHECK_NULL(ni_ibcls);
ni_ia4ctrID = (*env)->GetMethodID(env, ni_ia4cls, "<init>", "()V");
CHECK_NULL(ni_ia4ctrID);
ni_ia6ctrID = (*env)->GetMethodID(env, ni_ia6cls, "<init>", "()V");
CHECK_NULL(ni_ia6ctrID);
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);
ni_defaultIndexID = (*env)->GetStaticFieldID(env, ni_class, "defaultIndex", "I");
}
/*
* 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;
jobject obj = NULL;
ifs = enumInterfaces(env);
if (ifs == NULL) {
return NULL;
}
name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
/*
* Search the list of interface based on name
*/
curr = ifs;
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 interface 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);
}
freeif(ifs);
return obj;
}
/*
* 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;
#ifdef AF_INET6
int family = (getInetAddress_family(env, iaObj) == IPv4) ? AF_INET : AF_INET6;
#else
int family = AF_INET;
#endif
jobject obj = NULL;
jboolean match = JNI_FALSE;
ifs = enumInterfaces(env);
if (ifs == NULL) {
return NULL;
}
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 (address1 == address2) {
match = JNI_TRUE;
break;
}
}
#ifdef AF_INET6
if (family == AF_INET6) {
jbyte *bytes = (jbyte *)&(((struct sockaddr_in6*)addrP->addr)->sin6_addr);
jbyte caddr[16];
int i;
getInet6Address_ipaddress(env, iaObj, (char *)caddr);
i = 0;
while (i < 16) {
if (caddr[i] != bytes[i]) {
break;
}
i++;
}
if (i >= 16) {
match = JNI_TRUE;
break;
}
}
#endif
}
if (match) {
break;
}
addrP = addrP->next;
}
if (match) {
break;
}
curr = curr->next;
}
/* if found create a NetworkInterface */
if (match) {;
obj = createNetworkInterface(env, curr);
}
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 interface */
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);
curr = curr->next;
}
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 class, jbyteArray addrArray, jstring name, jint index) {
jint addr;
jbyte caddr[4];
struct in_addr iaddr;
jbyteArray ret = NULL;
unsigned char mac[16];
int len;
int sock;
jboolean isCopy;
const char* name_utf;
name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
if ((sock =openSocketWithFallback(env, name_utf)) < 0) {
(*env)->ReleaseStringUTFChars(env, name, name_utf);
return JNI_FALSE;
}
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, sock, name_utf, &iaddr, mac);
} else {
len = getMacAddress(env, sock, name_utf,NULL, mac);
}
if (len > 0) {
ret = (*env)->NewByteArray(env, len);
if (IS_NULL(ret)) {
/* we may have memory to free at the end of this */
goto fexit;
}
(*env)->SetByteArrayRegion(env, ret, 0, len, (jbyte *) (mac));
}
fexit:
/* release the UTF string and interface list */
(*env)->ReleaseStringUTFChars(env, name, name_utf);
close(sock);
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 class, jstring name, jint index) {
jboolean isCopy;
int ret = -1;
int sock;
const char* name_utf;
name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
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;
const char* name_utf;
int flags = 0;
name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
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) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGLIFFLAGS failed");
return -1;
}
return flags;
}
/*
* Create a NetworkInterface object, populate the name and index, and
* populate the InetAddress array based on the IP addresses for this
* interface.
*/
jobject createNetworkInterface(JNIEnv *env, netif *ifs) {
jobject netifObj;
jobject name;
jobjectArray addrArr;
jobjectArray bindArr;
jobjectArray childArr;
netaddr *addrs;
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);
name = (*env)->NewStringUTF(env, ifs->name);
if (netifObj == NULL || name == NULL) {
return 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 address 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, ni_iacls, 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, ni_ia4cls, ni_ia4ctrID);
if (iaObj) {
setInetAddress_addr(env, iaObj, htonl(((struct sockaddr_in*)addrP->addr)->sin_addr.s_addr));
}
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, ni_ia4cls, ni_ia4ctrID);
if (ia2Obj) {
setInetAddress_addr(env, ia2Obj, htonl(((struct sockaddr_in*)addrP->brdcast)->sin_addr.s_addr));
(*env)->SetObjectField(env, ibObj, ni_ib4broadcastID, ia2Obj);
}
}
(*env)->SetShortField(env, ibObj, ni_ib4maskID, addrP->mask);
(*env)->SetObjectArrayElement(env, bindArr, bind_index++, ibObj);
}
}
#ifdef AF_INET6
if (addrP->family == AF_INET6) {
int scope=0;
iaObj = (*env)->NewObject(env, ni_ia6cls, ni_ia6ctrID);
if (iaObj) {
int 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);
}
}
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);
}
}
#endif
if (iaObj == NULL) {
return NULL;
}
(*env)->SetObjectArrayElement(env, addrArr, addr_index++, 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);
/* return the NetworkInterface */
return netifObj;
}
/*
* Enumerates all interfaces
*/
static netif *enumInterfaces(JNIEnv *env) {
netif *ifs;
int sock;
/*
* Enumerate IPv4 addresses
*/
sock = openSocket(env, AF_INET);
if (sock < 0 && (*env)->ExceptionOccurred(env)) {
return NULL;
}
ifs = enumIPv4Interfaces(env, sock, NULL);
close(sock);
if (ifs == NULL && (*env)->ExceptionOccurred(env)) {
return NULL;
}
/* return partial list if an exception occurs in the middle of process ???*/
/*
* If IPv6 is available then enumerate IPv6 addresses.
*/
#ifdef AF_INET6
/* 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 && (*env)->ExceptionOccurred(env)) {
freeif(ifs);
return NULL;
}
ifs = enumIPv6Interfaces(env, sock, ifs);
close(sock);
if ((*env)->ExceptionOccurred(env)) {
freeif(ifs);
return NULL;
}
}
#endif
return ifs;
}
#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)
/*
* Free an interface list (including any attached addresses)
*/
void freeif(netif *ifs) {
netif *currif = ifs;
netif *child = NULL;
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;
}
}
netif *addif(JNIEnv *env, int sock, const char * if_name,
netif *ifs, struct sockaddr* ifr_addrP, int family,
short prefix)
{
netif *currif = ifs, *parent;
netaddr *addrP;
#ifdef LIFNAMSIZ
int ifnam_size = LIFNAMSIZ;
char name[LIFNAMSIZ], vname[LIFNAMSIZ];
#else
int ifnam_size = IFNAMSIZ;
char name[IFNAMSIZ], vname[IFNAMSIZ];
#endif
char *name_colonP;
int mask;
int isVirtual = 0;
int addr_size;
int flags = 0;
/*
* 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, ifnam_size);
name[ifnam_size - 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*/
#ifdef AF_INET6
addr_size = (family == AF_INET) ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6);
#else
addr_size = sizeof(struct sockaddr_in);
#endif
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->brdcast = NULL;
addrP->mask = prefix;
addrP->next = 0;
if (family == AF_INET) {
// Deal with broadcast addr & subnet mask
struct sockaddr * brdcast_to = (struct sockaddr *) ((char *) addrP + sizeof(netaddr) + addr_size);
addrP->brdcast = getBroadcast(env, sock, name, brdcast_to );
if ((mask = getSubnet(env, sock, name)) != -1)
addrP->mask = mask;
}
/**
* Deal with virtual interface with colon notation e.g. eth0:1
*/
name_colonP = strchr(name, ':');
if (name_colonP != NULL) {
/**
* 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 an netif structure and
* insert it onto the list.
*/
if (currif == NULL) {
CHECKED_MALLOC3(currif, netif *, sizeof(netif) + ifnam_size);
currif->name = (char *) currif+sizeof(netif);
strncpy(currif->name, name, ifnam_size);
currif->name[ifnam_size - 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;
/**
* Let's 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) + ifnam_size);
currif->name = (char *) currif + sizeof(netif);
strncpy(currif->name, vname, ifnam_size);
currif->name[ifnam_size - 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;
}
/* Open socket for further ioct calls
* proto is AF_INET/AF_INET6
*/
static int openSocket(JNIEnv *env, int proto){
int sock;
if ((sock = JVM_Socket(proto, SOCK_DGRAM, 0)) < 0) {
/*
* If EPROTONOSUPPORT is returned it means we don't have
* support for this proto so don't throw an exception.
*/
if (errno != EPROTONOSUPPORT) {
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException", "Socket creation failed");
}
return -1;
}
return sock;
}
/** Linux **/
#ifdef __linux__
/* Open socket for further ioct calls, try v4 socket first and
* if it falls return v6 socket
*/
#ifdef AF_INET6
static int openSocketWithFallback(JNIEnv *env, const char *ifname){
int sock;
struct ifreq if2;
if ((sock = JVM_Socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
if (errno == EPROTONOSUPPORT){
if ( (sock = JVM_Socket(AF_INET6, SOCK_DGRAM, 0)) < 0 ){
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException", "IPV6 Socket creation failed");
return -1;
}
}
else{ // errno is not NOSUPPORT
NET_ThrowByNameWithLastError(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;
}
#else
static int openSocketWithFallback(JNIEnv *env, const char *ifname){
return openSocket(env,AF_INET);
}
#endif
static netif *enumIPv4Interfaces(JNIEnv *env, int sock, netif *ifs) {
struct ifconf ifc;
struct ifreq *ifreqP;
char *buf;
int numifs;
unsigned i;
/* need to do a dummy SIOCGIFCONF to determine the buffer size.
* SIOCGIFCOUNT doesn't work
*/
ifc.ifc_buf = NULL;
if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException", "ioctl SIOCGIFCONF failed");
return ifs;
}
CHECKED_MALLOC3(buf,char *, ifc.ifc_len);
ifc.ifc_buf = buf;
if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException", "ioctl SIOCGIFCONF failed");
(void) free(buf);
return ifs;
}
/*
* Iterate through each interface
*/
ifreqP = ifc.ifc_req;
for (i=0; i<ifc.ifc_len/sizeof (struct ifreq); i++, ifreqP++) {
/*
* Add to the list
*/
ifs = addif(env, sock, ifreqP->ifr_name, ifs, (struct sockaddr *) & (ifreqP->ifr_addr), AF_INET, 0);
/*
* If an exception occurred then free the list
*/
if ((*env)->ExceptionOccurred(env)) {
free(buf);
freeif(ifs);
return NULL;
}
}
/*
* Free socket and buffer
*/
free(buf);
return ifs;
}
/*
* Enumerates and returns all IPv6 interfaces on Linux
*/
#ifdef AF_INET6
static netif *enumIPv6Interfaces(JNIEnv *env, int sock, netif *ifs) {
FILE *f;
char addr6[40], devname[21];
char addr6p[8][5];
int plen, scope, dad_status, if_idx;
uint8_t ipv6addr[16];
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, &plen, &scope, &dad_status, devname) != EOF) {
struct netif *ifs_ptr = NULL;
struct netif *last_ptr = NULL;
struct sockaddr_in6 addr;
sprintf(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]);
inet_pton(AF_INET6, addr6, ipv6addr);
memset(&addr, 0, sizeof(struct sockaddr_in6));
memcpy((void*)addr.sin6_addr.s6_addr, (const void*)ipv6addr, 16);
addr.sin6_scope_id = if_idx;
ifs = addif(env, sock, devname, ifs, (struct sockaddr *)&addr, AF_INET6, plen);
/*
* If an exception occurred then return the list as is.
*/
if ((*env)->ExceptionOccurred(env)) {
fclose(f);
return ifs;
}
}
fclose(f);
}
return ifs;
}
#endif
static int getIndex(int sock, const char *name){
/*
* Try to get the interface index
* (Not supported on Solaris 2.6 or 7)
*/
struct ifreq if2;
strcpy(if2.ifr_name, name);
if (ioctl(sock, SIOCGIFINDEX, (char *)&if2) < 0) {
return -1;
}
return if2.ifr_ifindex;
}
/**
* Returns the IPv4 broadcast address of a named interface, if it exists.
* Returns 0 if it doesn't have one.
*/
static struct sockaddr *getBroadcast(JNIEnv *env, int sock, const char *ifname, struct sockaddr *brdcast_store) {
struct sockaddr *ret = NULL;
struct ifreq if2;
memset((char *) &if2, 0, sizeof(if2));
strcpy(if2.ifr_name, ifname);
/* Let's make sure the interface does have a broadcast address */
if (ioctl(sock, SIOCGIFFLAGS, (char *)&if2) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGIFFLAGS failed");
return ret;
}
if (if2.ifr_flags & IFF_BROADCAST) {
/* It does, let's retrieve it*/
if (ioctl(sock, SIOCGIFBRDADDR, (char *)&if2) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGIFBRDADDR failed");
return ret;
}
ret = brdcast_store;
memcpy(ret, &if2.ifr_broadaddr, sizeof(struct sockaddr));
}
return ret;
}
/**
* Returns the IPv4 subnet prefix length (aka subnet mask) for the named
* interface, if it has one, otherwise return -1.
*/
static short getSubnet(JNIEnv *env, int sock, const char *ifname) {
unsigned int mask;
short ret;
struct ifreq if2;
memset((char *) &if2, 0, sizeof(if2));
strcpy(if2.ifr_name, ifname);
if (ioctl(sock, SIOCGIFNETMASK, (char *)&if2) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGIFNETMASK failed");
return -1;
}
mask = ntohl(((struct sockaddr_in*)&(if2.ifr_addr))->sin_addr.s_addr);
ret = 0;
while (mask) {
mask <<= 1;
ret++;
}
return ret;
}
/**
* Get the Hardware address (usually MAC address) for the named interface.
* 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, int sock, const char* ifname, const struct in_addr* addr, unsigned char *buf) {
static struct ifreq ifr;
int i;
strcpy(ifr.ifr_name, ifname);
if (ioctl(sock, SIOCGIFHWADDR, &ifr) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGIFHWADDR failed");
return -1;
}
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));
strcpy(if2.ifr_name, ifname);
if (ioctl(sock, SIOCGIFMTU, (char *)&if2) < 0) {
NET_ThrowByNameWithLastError(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));
strcpy(if2.ifr_name, ifname);
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
/** Solaris **/
#ifdef __solaris__
/* Open socket for further ioct calls, try v4 socket first and
* if it falls return v6 socket
*/
#ifdef AF_INET6
static int openSocketWithFallback(JNIEnv *env, const char *ifname){
int sock, alreadyV6 = 0;
struct lifreq if2;
if ((sock = JVM_Socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
if (errno == EPROTONOSUPPORT){
if ( (sock = JVM_Socket(AF_INET6, SOCK_DGRAM, 0)) < 0 ){
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException", "IPV6 Socket creation failed");
return -1;
}
alreadyV6=1;
}
else{ // errno is not NOSUPPORT
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException", "IPV4 Socket creation failed");
return -1;
}
}
/**
* Solaris requires that we have an IPv6 socket to query an
* interface without an IPv4 address - check it here.
* POSIX 1 require the kernel to return ENOTTY if the call is
* inappropriate for a device e.g. the NETMASK for a device having IPv6
* only address but not all devices follow the standard so
* fall back on any error. It's not an ecologically friendly gesture
* but more reliable.
*/
if (! alreadyV6 ){
memset((char *) &if2, 0, sizeof(if2));
strcpy(if2.lifr_name, ifname);
if (ioctl(sock, SIOCGLIFNETMASK, (char *)&if2) < 0) {
close(sock);
if ( (sock = JVM_Socket(AF_INET6, SOCK_DGRAM, 0)) < 0 ){
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException", "IPV6 Socket creation failed");
return -1;
}
}
}
return sock;
}
#else
static int openSocketWithFallback(JNIEnv *env, const char *ifname){
return openSocket(env,AF_INET);
}
#endif
/*
* Enumerates and returns all IPv4 interfaces
* (linux verision)
*/
static netif *enumIPv4Interfaces(JNIEnv *env, int sock, netif *ifs) {
return enumIPvXInterfaces(env,sock, ifs, AF_INET);
}
#ifdef AF_INET6
static netif *enumIPv6Interfaces(JNIEnv *env, int sock, netif *ifs) {
return enumIPvXInterfaces(env,sock, ifs, AF_INET6);
}
#endif
/*
Enumerates and returns all interfaces on Solaris
use the same code for IPv4 and IPv6
*/
static netif *enumIPvXInterfaces(JNIEnv *env, int sock, netif *ifs, int family) {
struct lifconf ifc;
struct lifreq *ifr;
int n;
char *buf;
struct lifnum numifs;
unsigned bufsize;
/*
* Get the interface count
*/
numifs.lifn_family = family;
numifs.lifn_flags = 0;
if (ioctl(sock, SIOCGLIFNUM, (char *)&numifs) < 0) {
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException", "ioctl SIOCGLIFNUM failed");
return ifs;
}
/*
* Enumerate the interface configurations
*/
bufsize = numifs.lifn_count * sizeof (struct lifreq);
CHECKED_MALLOC3(buf, char *, bufsize);
ifc.lifc_family = family;
ifc.lifc_flags = 0;
ifc.lifc_len = bufsize;
ifc.lifc_buf = buf;
if (ioctl(sock, SIOCGLIFCONF, (char *)&ifc) < 0) {
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException", "ioctl SIOCGLIFCONF failed");
free(buf);
return ifs;
}
/*
* Iterate through each interface
*/
ifr = ifc.lifc_req;
for (n=0; n<numifs.lifn_count; n++, ifr++) {
int index = -1;
struct lifreq if2;
/*
* Ignore either IPv4 or IPv6 addresses
*/
if (ifr->lifr_addr.ss_family != family) {
continue;
}
#ifdef AF_INET6
if (ifr->lifr_addr.ss_family == AF_INET6) {
struct sockaddr_in6 *s6= (struct sockaddr_in6 *)&(ifr->lifr_addr);
s6->sin6_scope_id = getIndex(sock, ifr->lifr_name);
}
#endif
/* add to the list */
ifs = addif(env, sock,ifr->lifr_name, ifs, (struct sockaddr *)&(ifr->lifr_addr),family, (short) ifr->lifr_addrlen);
/*
* If an exception occurred we return immediately
*/
if ((*env)->ExceptionOccurred(env)) {
free(buf);
return ifs;
}
}
free(buf);
return ifs;
}
static int getIndex(int sock, const char *name){
/*
* Try to get the interface index
* (Not supported on Solaris 2.6 or 7)
*/
struct lifreq if2;
strcpy(if2.lifr_name, name);
if (ioctl(sock, SIOCGLIFINDEX, (char *)&if2) < 0) {
return -1;
}
return if2.lifr_index;
}
/**
* Returns the IPv4 broadcast address of a named interface, if it exists.
* Returns 0 if it doesn't have one.
*/
static struct sockaddr *getBroadcast(JNIEnv *env, int sock, const char *ifname, struct sockaddr *brdcast_store) {
struct sockaddr *ret = NULL;
struct lifreq if2;
memset((char *) &if2, 0, sizeof(if2));
strcpy(if2.lifr_name, ifname);
/* Let's make sure the interface does have a broadcast address */
if (ioctl(sock, SIOCGLIFFLAGS, (char *)&if2) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGLIFFLAGS failed");
return ret;
}
if (if2.lifr_flags & IFF_BROADCAST) {
/* It does, let's retrieve it*/
if (ioctl(sock, SIOCGLIFBRDADDR, (char *)&if2) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGLIFBRDADDR failed");
return ret;
}
ret = brdcast_store;
memcpy(ret, &if2.lifr_broadaddr, sizeof(struct sockaddr));
}
return ret;
}
/**
* Returns the IPv4 subnet prefix length (aka subnet mask) for the named
* interface, if it has one, otherwise return -1.
*/
static short getSubnet(JNIEnv *env, int sock, const char *ifname) {
unsigned int mask;
short ret;
struct lifreq if2;
memset((char *) &if2, 0, sizeof(if2));
strcpy(if2.lifr_name, ifname);
if (ioctl(sock, SIOCGLIFNETMASK, (char *)&if2) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGLIFNETMASK failed");
return -1;
}
mask = ntohl(((struct sockaddr_in*)&(if2.lifr_addr))->sin_addr.s_addr);
ret = 0;
while (mask) {
mask <<= 1;
ret++;
}
return ret;
}
#define DEV_PREFIX "/dev/"
/**
* Solaris specific DLPI code to get hardware address from a device.
* Unfortunately, at least up to Solaris X, you have to have special
* privileges (i.e. be root).
*/
static int getMacFromDevice(JNIEnv *env, const char* ifname, unsigned char* retbuf) {
char style1dev[MAXPATHLEN];
int fd;
dl_phys_addr_req_t dlpareq;
dl_phys_addr_ack_t *dlpaack;
struct strbuf msg;
char buf[128];
int flags = 0;
/**
* Device is in /dev
* e.g.: /dev/bge0
*/
strcpy(style1dev, DEV_PREFIX);
strcat(style1dev, ifname);
if ((fd = open(style1dev, O_RDWR)) < 0) {
/*
* Can't open it. We probably are missing the privilege.
* We'll have to try something else
*/
return 0;
}
dlpareq.dl_primitive = DL_PHYS_ADDR_REQ;
dlpareq.dl_addr_type = DL_CURR_PHYS_ADDR;
msg.buf = (char *)&dlpareq;
msg.len = DL_PHYS_ADDR_REQ_SIZE;
if (putmsg(fd, &msg, NULL, 0) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "putmsg failed");
return -1;
}
dlpaack = (dl_phys_addr_ack_t *)buf;
msg.buf = (char *)buf;
msg.len = 0;
msg.maxlen = sizeof (buf);
if (getmsg(fd, &msg, NULL, &flags) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "getmsg failed");
return -1;
}
if (msg.len < DL_PHYS_ADDR_ACK_SIZE || dlpaack->dl_primitive != DL_PHYS_ADDR_ACK) {
JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Couldn't obtain phys addr\n");
return -1;
}
memcpy(retbuf, &buf[dlpaack->dl_addr_offset], dlpaack->dl_addr_length);
return dlpaack->dl_addr_length;
}
/**
* Get the Hardware address (usually MAC address) for the named interface.
* 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, int sock, const char *ifname, const struct in_addr* addr, unsigned char *buf) {
struct arpreq arpreq;
struct sockaddr_in* sin;
struct sockaddr_in ipAddr;
int len, i;
struct lifreq lif;
/* First, try the new (S11) SIOCGLIFHWADDR ioctl(). If that fails
* try the old way.
*/
memset(&lif, 0, sizeof(lif));
strlcpy(lif.lifr_name, ifname, sizeof(lif.lifr_name));
if (ioctl(sock, SIOCGLIFHWADDR, &lif) != -1) {
struct sockaddr_dl *sp;
sp = (struct sockaddr_dl *)&lif.lifr_addr;
memcpy(buf, &sp->sdl_data[0], sp->sdl_alen);
return sp->sdl_alen;
}
/**
* On Solaris we have to use DLPI, but it will only work if we have
* privileged access (i.e. root). If that fails, we try a lookup
* in the ARP table, which requires an IPv4 address.
*/
if ((len = getMacFromDevice(env, ifname, buf)) == 0) {
/*DLPI failed - trying to do arp lookup*/
if (addr == NULL) {
/**
* No IPv4 address for that interface, so can't do an ARP lookup.
*/
return -1;
}
len = 6; //???
sin = (struct sockaddr_in *) &arpreq.arp_pa;
memset((char *) &arpreq, 0, sizeof(struct arpreq));
ipAddr.sin_port = 0;
ipAddr.sin_family = AF_INET;
memcpy(&ipAddr.sin_addr, addr, sizeof(struct in_addr));
memcpy(&arpreq.arp_pa, &ipAddr, sizeof(struct sockaddr_in));
arpreq.arp_flags= ATF_PUBL;
if (ioctl(sock, SIOCGARP, &arpreq) < 0) {
return -1;
}
memcpy(buf, &arpreq.arp_ha.sa_data[0], len );
}
/*
* All bytes to 0 means no hardware address.
*/
for (i = 0; i < len; i++) {
if (buf[i] != 0)
return len;
}
return -1;
}
static int getMTU(JNIEnv *env, int sock, const char *ifname) {
struct lifreq if2;
memset((char *) &if2, 0, sizeof(if2));
strcpy(if2.lifr_name, ifname);
if (ioctl(sock, SIOCGLIFMTU, (char *)&if2) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGLIFMTU failed");
return -1;
}
return if2.lifr_mtu;
}
static int getFlags(int sock, const char *ifname, int *flags) {
struct lifreq lifr;
memset((caddr_t)&lifr, 0, sizeof(lifr));
strcpy((caddr_t)&(lifr.lifr_name), ifname);
if (ioctl(sock, SIOCGLIFFLAGS, (char *)&lifr) < 0) {
return -1;
}
*flags = lifr.lifr_flags;
return 0;
}
#endif
/** BSD **/
#ifdef _ALLBSD_SOURCE
/* Open socket for further ioct calls, try v4 socket first and
* if it falls return v6 socket
*/
#ifdef AF_INET6
static int openSocketWithFallback(JNIEnv *env, const char *ifname){
int sock;
struct ifreq if2;
if ((sock = JVM_Socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
if (errno == EPROTONOSUPPORT){
if ( (sock = JVM_Socket(AF_INET6, SOCK_DGRAM, 0)) < 0 ){
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException", "IPV6 Socket creation failed");
return -1;
}
}
else{ // errno is not NOSUPPORT
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException", "IPV4 Socket creation failed");
return -1;
}
}
return sock;
}
#else
static int openSocketWithFallback(JNIEnv *env, const char *ifname){
return openSocket(env,AF_INET);
}
#endif
/*
* Enumerates and returns all IPv4 interfaces
*/
static netif *enumIPv4Interfaces(JNIEnv *env, int sock, netif *ifs) {
struct ifaddrs *ifa, *origifa;
if (getifaddrs(&origifa) != 0) {
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException",
"getifaddrs() function failed");
return ifs;
}
for (ifa = origifa; ifa != NULL; ifa = ifa->ifa_next) {
/*
* Skip non-AF_INET entries.
*/
if (ifa->ifa_addr == NULL || ifa->ifa_addr->sa_family != AF_INET)
continue;
/*
* Add to the list.
*/
ifs = addif(env, sock, ifa->ifa_name, ifs, ifa->ifa_addr, AF_INET, 0);
/*
* If an exception occurred then free the list.
*/
if ((*env)->ExceptionOccurred(env)) {
freeifaddrs(origifa);
freeif(ifs);
return NULL;
}
}
/*
* Free socket and buffer
*/
freeifaddrs(origifa);
return ifs;
}
/*
* Enumerates and returns all IPv6 interfaces on Linux
*/
#ifdef AF_INET6
/*
* Determines the prefix on BSD for IPv6 interfaces.
*/
static
int prefix(void *val, int size) {
u_char *name = (u_char *)val;
int byte, bit, plen = 0;
for (byte = 0; byte < size; byte++, plen += 8)
if (name[byte] != 0xff)
break;
if (byte == size)
return (plen);
for (bit = 7; bit != 0; bit--, plen++)
if (!(name[byte] & (1 << bit)))
break;
for (; bit != 0; bit--)
if (name[byte] & (1 << bit))
return (0);
byte++;
for (; byte < size; byte++)
if (name[byte])
return (0);
return (plen);
}
/*
* Enumerates and returns all IPv6 interfaces on BSD
*/
static netif *enumIPv6Interfaces(JNIEnv *env, int sock, netif *ifs) {
struct ifaddrs *ifa, *origifa;
struct sockaddr_in6 *sin6;
struct in6_ifreq ifr6;
if (getifaddrs(&origifa) != 0) {
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException",
"getifaddrs() function failed");
return ifs;
}
for (ifa = origifa; ifa != NULL; ifa = ifa->ifa_next) {
/*
* Skip non-AF_INET6 entries.
*/
if (ifa->ifa_addr == NULL || ifa->ifa_addr->sa_family != AF_INET6)
continue;
memset(&ifr6, 0, sizeof(ifr6));
strlcpy(ifr6.ifr_name, ifa->ifa_name, sizeof(ifr6.ifr_name));
memcpy(&ifr6.ifr_addr, ifa->ifa_addr, MIN(sizeof(ifr6.ifr_addr), ifa->ifa_addr->sa_len));
if (ioctl(sock, SIOCGIFNETMASK_IN6, (caddr_t)&ifr6) < 0) {
NET_ThrowByNameWithLastError(env , JNU_JAVANETPKG "SocketException",
"ioctl SIOCGIFNETMASK_IN6 failed");
freeifaddrs(origifa);
freeif(ifs);
return NULL;
}
/* Add to the list. */
sin6 = (struct sockaddr_in6 *)&ifr6.ifr_addr;
ifs = addif(env, sock, ifa->ifa_name, ifs, ifa->ifa_addr, AF_INET6,
prefix(&sin6->sin6_addr, sizeof(struct in6_addr)));
/* If an exception occurred then free the list. */
if ((*env)->ExceptionOccurred(env)) {
freeifaddrs(origifa);
freeif(ifs);
return NULL;
}
}
/*
* Free socket and ifaddrs buffer
*/
freeifaddrs(origifa);
return ifs;
}
#endif
static int getIndex(int sock, const char *name){
#ifdef __FreeBSD__
/*
* Try to get the interface index
* (Not supported on Solaris 2.6 or 7)
*/
struct ifreq if2;
strcpy(if2.ifr_name, name);
if (ioctl(sock, SIOCGIFINDEX, (char *)&if2) < 0) {
return -1;
}
return if2.ifr_index;
#else
/*
* Try to get the interface index using BSD specific if_nametoindex
*/
int index = if_nametoindex(name);
return (index == 0) ? -1 : index;
#endif
}
/**
* Returns the IPv4 broadcast address of a named interface, if it exists.
* Returns 0 if it doesn't have one.
*/
static struct sockaddr *getBroadcast(JNIEnv *env, int sock, const char *ifname, struct sockaddr *brdcast_store) {
struct sockaddr *ret = NULL;
struct ifreq if2;
memset((char *) &if2, 0, sizeof(if2));
strcpy(if2.ifr_name, ifname);
/* Let's make sure the interface does have a broadcast address */
if (ioctl(sock, SIOCGIFFLAGS, (char *)&if2) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGIFFLAGS failed");
return ret;
}
if (if2.ifr_flags & IFF_BROADCAST) {
/* It does, let's retrieve it*/
if (ioctl(sock, SIOCGIFBRDADDR, (char *)&if2) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGIFBRDADDR failed");
return ret;
}
ret = brdcast_store;
memcpy(ret, &if2.ifr_broadaddr, sizeof(struct sockaddr));
}
return ret;
}
/**
* Returns the IPv4 subnet prefix length (aka subnet mask) for the named
* interface, if it has one, otherwise return -1.
*/
static short getSubnet(JNIEnv *env, int sock, const char *ifname) {
unsigned int mask;
short ret;
struct ifreq if2;
memset((char *) &if2, 0, sizeof(if2));
strcpy(if2.ifr_name, ifname);
if (ioctl(sock, SIOCGIFNETMASK, (char *)&if2) < 0) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGIFNETMASK failed");
return -1;
}
mask = ntohl(((struct sockaddr_in*)&(if2.ifr_addr))->sin_addr.s_addr);
ret = 0;
while (mask) {
mask <<= 1;
ret++;
}
return ret;
}
/**
* Get the Hardware address (usually MAC address) for the named interface.
* 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, int sock, 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;
/* 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 is 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));
strcpy(if2.ifr_name, ifname);
if (ioctl(sock, SIOCGIFMTU, (char *)&if2) < 0) {
NET_ThrowByNameWithLastError(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;
int ret = -1;
memset((char *) &if2, 0, sizeof(if2));
strcpy(if2.ifr_name, ifname);
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
Other Java examples (source code examples)Here is a short list of links related to this Java NetworkInterface.c source code file: |
The search page
Other Java source code examples at this package level
Click here to learn more about this project
