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look for flags in /proc/net/arp - otherwise some strange Macs can be returned

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This commit is contained in:
Anton Keks 2022-01-21 18:50:20 +02:00
parent ace2f3de5d
commit 339533c22f
1 changed files with 6 additions and 4 deletions
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10
src/net/azib/ipscan/fetchers/LinuxMACFetcher.java
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@ -10,12 +10,14 @@ import static net.azib.ipscan.fetchers.UnixMACFetcher.getLocalMAC;
public class LinuxMACFetcher extends MACFetcher {
private static final Path ARP_TABLE = Path.of("/proc/net/arp");
private int flagsIndex;
private int macIndex;
private int macLength = 17;
private String unavailableMac = "00:00:00:00:00:00";
public LinuxMACFetcher() {
macIndex = arpLines().findFirst().get().indexOf("HW addr");
String line = arpLines().findFirst().get();
flagsIndex = line.indexOf("Flags");
macIndex = line.indexOf("HW addr");
}
private static Stream<String> arpLines() {
@ -29,9 +31,9 @@ public class LinuxMACFetcher extends MACFetcher {
@Override public String resolveMAC(ScanningSubject subject) {
try {
String ip = subject.getAddress().getHostAddress();
return arpLines().filter(line -> line.startsWith(ip + " ")).findFirst()
return arpLines()
.filter(line -> line.startsWith(ip + " ") && !line.substring(flagsIndex, flagsIndex + 3).equals("0x0")).findFirst()
.map(line -> line.substring(macIndex, macIndex + macLength).toUpperCase())
.filter(mac -> !unavailableMac.equals(mac))
.orElse(getLocalMAC(subject));
}
catch (Exception e) {