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Support IPv6 SLAAC addresses.

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This commit is contained in:
akwizgran
2020-02-17 11:07:14 +00:00
parent 2bd2f67693
commit e1084ffadd
8 changed files with 279 additions and 145 deletions
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52
bramble-api/src/main/java/org/briarproject/bramble/util/PrivacyUtils.java
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@@ -2,13 +2,17 @@ package org.briarproject.bramble.util;
import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
import java.net.Inet6Address;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import javax.annotation.Nullable;
import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
import static org.briarproject.bramble.util.StringUtils.isValidMac;
import static org.briarproject.bramble.util.StringUtils.toHexString;
@NotNullByDefault
public class PrivacyUtils {
@@ -19,7 +23,7 @@ public class PrivacyUtils {
@Nullable
public static String scrubMacAddress(@Nullable String address) {
if (address == null || address.length() == 0) return null;
if (isNullOrEmpty(address) || !isValidMac(address)) return address;
// this is a fake address we need to know about
if (address.equals("02:00:00:00:00:00")) return address;
// keep first and last octet of MAC address
@@ -27,39 +31,37 @@ public class PrivacyUtils {
+ address.substring(14, 17);
}
@Nullable
public static String scrubInetAddress(InetAddress address) {
// don't scrub link and site local addresses
if (address.isLinkLocalAddress() || address.isSiteLocalAddress())
return address.toString();
// completely scrub IPv6 addresses
if (address instanceof Inet6Address) return "[scrubbed]";
// keep first and last octet of IPv4 addresses
return scrubInetAddress(address.toString());
if (address instanceof Inet4Address) {
// Don't scrub local IPv4 addresses
if (address.isLoopbackAddress() || address.isLinkLocalAddress() ||
address.isSiteLocalAddress()) {
return address.getHostAddress();
}
// Keep first and last octet of non-local IPv4 addresses
return scrubIpv4Address(address.getAddress());
} else {
// Keep first and last octet of IPv6 addresses
return scrubIpv6Address(address.getAddress());
}
}
@Nullable
public static String scrubInetAddress(@Nullable String address) {
if (address == null) return null;
int firstDot = address.indexOf(".");
if (firstDot == -1) return "[scrubbed]";
String prefix = address.substring(0, firstDot + 1);
int lastDot = address.lastIndexOf(".");
String suffix = address.substring(lastDot, address.length());
return prefix + "[scrubbed]" + suffix;
private static String scrubIpv4Address(byte[] ipv4) {
return (ipv4[0] & 0xFF) + ".[scrubbed]." + (ipv4[3] & 0xFF);
}
private static String scrubIpv6Address(byte[] ipv6) {
String hex = toHexString(ipv6).toLowerCase();
return hex.substring(0, 2) + "[scrubbed]" + hex.substring(30);
}
@Nullable
public static String scrubSocketAddress(InetSocketAddress address) {
InetAddress inetAddress = address.getAddress();
return scrubInetAddress(inetAddress);
return scrubInetAddress(address.getAddress());
}
@Nullable
public static String scrubSocketAddress(SocketAddress address) {
if (address instanceof InetSocketAddress)
return scrubSocketAddress((InetSocketAddress) address);
return scrubInetAddress(address.toString());
return "[scrubbed]";
}
}