/** try to determine MAC address of local network card; this is done using a shell to run ifconfig (linux) or ipconfig (windows). The output of the processes will be parsed. <p> To run the whole thing, just type java NetworkInfo <p> Current restrictions: <ul> <li>Will probably not run in applets <li>Tested Windows / Linux only <li>Tested J2SDK 1.4 only <li>If a computer has more than one network adapters, only one MAC address will be returned <li>will not run if user does not have permissions to run ifconfig/ipconfig (e.g. under linux this is typically only permitted for root) </ul> */import java.net.InetAddress;import java.io.InputStream;import java.io.BufferedInputStream;import java.io.IOException;import java.text.ParseException;import java.util.StringTokenizer;import java.applet.Applet;import java.awt.*;public final class NetworkInfo extends Applet { private final static String getMacAddress() throws IOException { String os = System.getProperty("os.name"); try { if(os.startsWith("Windows")) { return windowsParseMacAddress(windowsRunIpConfigCommand()); } else if(os.startsWith("Linux")) { return linuxParseMacAddress(linuxRunIfConfigCommand()); } else { throw new IOException("unknown operating system: " + os); } } catch(ParseException ex) { ex.printStackTrace(); throw new IOException(ex.getMessage()); } } /* * Linux stuff */ private final static String linuxParseMacAddress(String ipConfigResponse) throws ParseException { String localHost = null; try { localHost = InetAddress.getLocalHost().getHostAddress(); } catch(java.net.UnknownHostException ex) { ex.printStackTrace(); throw new ParseException(ex.getMessage(), 0); } StringTokenizer tokenizer = new StringTokenizer(ipConfigResponse, "\n"); String lastMacAddress = null; while(tokenizer.hasMoreTokens()) { String line = tokenizer.nextToken().trim(); boolean containsLocalHost = line.indexOf(localHost) >= 0; // see if line contains IP address if(containsLocalHost && lastMacAddress != null) { return lastMacAddress; } // see if line contains MAC address int macAddressPosition = line.indexOf("HWaddr"); if(macAddressPosition <= 0) continue; String macAddressCandidate = line.substring(macAddressPosition + 6).trim(); if(linuxIsMacAddress(macAddressCandidate)) { lastMacAddress = macAddressCandidate; continue; } } ParseException ex = new ParseException ("cannot read MAC address for " + localHost + " from [" + ipConfigResponse + "]", 0); ex.printStackTrace(); throw ex; } private final static boolean linuxIsMacAddress(String macAddressCandidate) { // TODO: use a smart regular expression if(macAddressCandidate.length() != 17) return false; return true; } private final static String linuxRunIfConfigCommand() throws IOException { Process p = Runtime.getRuntime().exec("ifconfig"); InputStream stdoutStream = new BufferedInputStream(p.getInputStream()); StringBuffer buffer= new StringBuffer(); for (;;) { int c = stdoutStream.read(); if (c == -1) break; buffer.append((char)c); } String outputText = buffer.toString(); stdoutStream.close(); return outputText; } /* * Windows stuff */ private final static String windowsParseMacAddress(String ipConfigResponse) throws ParseException { String localHost = null; try { localHost = InetAddress.getLocalHost().getHostAddress(); } catch(java.net.UnknownHostException ex) { ex.printStackTrace(); throw new ParseException(ex.getMessage(), 0); } StringTokenizer tokenizer = new StringTokenizer(ipConfigResponse, "\n"); String lastMacAddress = null; while(tokenizer.hasMoreTokens()) { String line = tokenizer.nextToken().trim(); // see if line contains IP address if(line.endsWith(localHost) && lastMacAddress != null) { return lastMacAddress; } // see if line contains MAC address int macAddressPosition = line.indexOf(":"); if(macAddressPosition <= 0) continue; String macAddressCandidate = line.substring(macAddressPosition + 1).trim(); if(windowsIsMacAddress(macAddressCandidate)) { lastMacAddress = macAddressCandidate; continue; } } ParseException ex = new ParseException("cannot read MAC address from [" + ipConfigResponse + "]", 0); ex.printStackTrace(); throw ex; } private final static boolean windowsIsMacAddress(String macAddressCandidate) { // TODO: use a smart regular expression if(macAddressCandidate.length() != 17) return false; return true; } private final static String windowsRunIpConfigCommand() throws IOException { Process p = Runtime.getRuntime().exec("ipconfig /all"); InputStream stdoutStream = new BufferedInputStream(p.getInputStream()); StringBuffer buffer= new StringBuffer(); for (;;) { int c = stdoutStream.read(); if (c == -1) break; buffer.append((char)c); } String outputText = buffer.toString(); stdoutStream.close(); return outputText; } /* * Main */ public final static void main(Graphics g) { try { //System.out.println("Network infos"); //System.out.println(" Operating System: " + System.getProperty("os.name")); //System.out.println(" IP/Localhost: " + InetAddress.getLocalHost().getHostAddress()); //System.out.println(" MAC Address: " + getMacAddress()); g.drawString(" MAC Address: " + getMacAddress(),20,20); } catch(Throwable t) { t.printStackTrace(); } }}