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/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
/**
* \file HardwareAddressRetriever_win.c
* \brief Hardware address retriever (Windows specific code).
* \author Sebastien Vincent
* \date 2010
*/
#if defined(_WIN32) || defined(_WIN64)
/**
* \def WIN32_LEAN_AND_MEAN
* \brief Exclude not commonly used headers from win32 API.
*
* It excludes some unused stuff from windows headers and
* by the way code compiles faster.
*/
#define WIN32_LEAN_AND_MEAN
#include <stdlib.h>
#include <windows.h>
#include <ws2tcpip.h>
#include <iphlpapi.h>
#include "HardwareAddressRetriever.h"
jbyteArray getHardwareAddress(JNIEnv* env, jstring ifName)
{
MIB_IFTABLE* ifTable = NULL;
ULONG size = 15000;
int found = 0;
jbyteArray hwaddr = NULL;
DWORD ret = 0;
DWORD i = 0;
WCHAR* wname = NULL;
MIB_IFROW ifi;
jclass clazz = (*env)->GetObjectClass(env, ifName);
jmethodID method = (*env)->GetMethodID(env, clazz, "compareTo", "(Ljava/lang/String;)I");
if(method == NULL)
{
return NULL;
}
memset(&ifi, 0x00, sizeof(MIB_IFROW));
do
{
ifTable = malloc(size);
if(!ifTable)
{
/* out of memory */
return NULL;
}
ret = GetIfTable(ifTable, &size, 1);
}while(ret == ERROR_INSUFFICIENT_BUFFER);
if(ret != ERROR_SUCCESS)
{
free(ifTable);
return NULL;
}
for(i = 0 ; i < ifTable->dwNumEntries ; i++)
{
jstring tmp = NULL;
ifi = ifTable->table[i];
if(ifi.dwType == IF_TYPE_OTHER)
{
continue;
}
/* jstring created by NewStringUTF will be garbage collected at
* the end of the function
*/
tmp = (*env)->NewStringUTF(env, ifi.bDescr);
if(!tmp)
{
/* printf("error\n"); */
continue;
}
if((*env)->CallIntMethod(env, ifName, method, tmp) == 0)
{
found = 1;
break;
}
}
if(found)
{
DWORD hwlen = ifi.dwPhysAddrLen;
if(hwlen > 0)
{
hwaddr = (*env)->NewByteArray(env, hwlen);
if(hwaddr)
{
/* copy the hardware address and return it */
(*env)->SetByteArrayRegion(env, hwaddr, 0, hwlen, ifi.bPhysAddr);
}
}
}
/* cleanup */
free(ifTable);
return hwaddr;
}
#endif
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