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Code Issues Projects Releases Wiki Activity

Recognise unusual AP addresses.

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This commit is contained in:
akwizgran
2020-03-09 13:23:22 +00:00
parent d0c53f1310
commit e065d45d16
2 changed files with 43 additions and 9 deletions
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45
bramble-android/src/main/java/org/briarproject/bramble/plugin/tcp/AndroidLanTcpPlugin.java
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@@ -18,6 +18,7 @@ import org.briarproject.bramble.api.settings.Settings;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.Socket;
import java.net.SocketException;
@@ -110,23 +111,53 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
if (info != null && info.getIpAddress() != 0) {
return new Pair<>(intToInetAddress(info.getIpAddress()), false);
}
List<InetAddress> addrs = getLocalInetAddresses();
List<InterfaceAddress> ifAddrs = getLocalInterfaceAddresses();
// If we're providing a normal access point, return its address
for (InetAddress addr : addrs) {
if (WIFI_AP_ADDRESS.equals(addr)) {
return new Pair<>(addr, true);
for (InterfaceAddress ifAddr : ifAddrs) {
if (isAndroidWifiApAddress(ifAddr)) {
return new Pair<>(ifAddr.getAddress(), true);
}
}
// If we're providing a wifi direct access point, return its address
for (InetAddress addr : addrs) {
if (WIFI_DIRECT_AP_ADDRESS.equals(addr)) {
return new Pair<>(addr, true);
for (InterfaceAddress ifAddr : ifAddrs) {
if (isAndroidWifiDirectApAddress(ifAddr)) {
return new Pair<>(ifAddr.getAddress(), true);
}
}
// Not connected to wifi
return null;
}
/**
* Returns true if the given address belongs to a network provided by an
* Android access point (including the access point's own address).
* <p>
* The access point's address is usually 192.168.43.1, but at least one
* device (Honor 8A) may use other addresses in the range 192.168.43.0/24.
*/
private boolean isAndroidWifiApAddress(InterfaceAddress ifAddr) {
if (ifAddr.getNetworkPrefixLength() != 24) return false;
byte[] ip = ifAddr.getAddress().getAddress();
return ip.length == 4
&& ip[0] == (byte) 192
&& ip[1] == (byte) 168
&& ip[2] == (byte) 43;
}
/**
* Returns true if the given address belongs to a network provided by an
* Android wifi direct legacy mode access point (including the access
* point's own address).
*/
private boolean isAndroidWifiDirectApAddress(InterfaceAddress ifAddr) {
if (ifAddr.getNetworkPrefixLength() != 24) return false;
byte[] ip = ifAddr.getAddress().getAddress();
return ip.length == 4
&& ip[0] == (byte) 192
&& ip[1] == (byte) 168
&& ip[2] == (byte) 49;
}
@Nullable
private InetAddress getSlaacAddressForInterface(InetAddress wifi) {
try {