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more dns fixes. hopefully the last

This commit is contained in:
Daniel Gultsch 2014-03-27 14:31:55 +01:00
parent 800c18956b
commit 8988873d77
1 changed files with 96 additions and 82 deletions
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42
src/eu/siacs/conversations/utils/DNSHelper.java
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@ -17,13 +17,17 @@ public class DNSHelper {
public static Bundle getSRVRecord(String host) throws IOException {
InetAddress ip = InetAddress.getByName("8.8.8.8");
try {
Class<?> SystemProperties = Class.forName("android.os.SystemProperties");
Method method = SystemProperties.getMethod("get", new Class[] { String.class });
Class<?> SystemProperties = Class
.forName("android.os.SystemProperties");
Method method = SystemProperties.getMethod("get",
new Class[] { String.class });
ArrayList<String> servers = new ArrayList<String>();
for (String name : new String[] { "net.dns1", "net.dns2", "net.dns3", "net.dns4", }) {
for (String name : new String[] { "net.dns1", "net.dns2",
"net.dns3", "net.dns4", }) {
String value = (String) method.invoke(null, name);
if (value != null && !"".equals(value) && !servers.contains(value))
if (value != null && !"".equals(value)
&& !servers.contains(value)) {
ip = InetAddress.getByName(value);
servers.add(value);
Bundle result = queryDNS(host, ip);
@ -31,6 +35,7 @@ public class DNSHelper {
return result;
}
}
}
} catch (ClassNotFoundException e) {
ip = InetAddress.getByName("8.8.8.8");
} catch (NoSuchMethodException e) {
@ -48,7 +53,8 @@ public class DNSHelper {
public static Bundle queryDNS(String host, InetAddress dnsServer) {
Bundle namePort = new Bundle();
try {
Log.d("xmppService","using dns server: "+dnsServer.toString()+" to look up "+host);
Log.d("xmppService", "using dns server: " + dnsServer.toString()
+ " to look up " + host);
String[] hostParts = host.split("\\.");
byte[] transId = new byte[2];
Random random = new Random();
@ -83,11 +89,14 @@ public class DNSHelper {
receiveData.length);
datagramSocket.setSoTimeout(3000);
datagramSocket.receive(receivePacket);
if (receiveData[3]!=-128) {
if (receiveData[3] != -128) {
Log.d("xmppService", "not the right count");
namePort.putString("error", "nosrv");
return namePort;
}
namePort.putInt("port",calcPort(receiveData[realLenght + 16],
namePort.putInt(
"port",
calcPort(receiveData[realLenght + 16],
receiveData[realLenght + 17]));
int i = realLenght + 18;
int wordLenght = 0;
@ -103,15 +112,19 @@ public class DNSHelper {
++i;
}
builder.replace(0, 1, "");
byte type = receiveData[i+1];
if (type!=-64) {
byte type = receiveData[i + 1];
byte type2 = receiveData[i + 2];
if ((type == -64) || (type == type2)) {
namePort.putString("name", builder.toString());
return namePort;
} else {
Log.d("xmppService", "type=" + type + " type2=" + type2 + " "
+ builder.toString());
namePort.putString("error", "nosrv");
return namePort;
}
namePort.putString("name",builder.toString());
return namePort;
} catch (IOException e) {
Log.d("xmppService","io execpiton during dns");
Log.d("xmppService", "io execpiton during dns");
namePort.putString("error", "nosrv");
return namePort;
}
@ -119,7 +132,7 @@ public class DNSHelper {
static int calcPort(byte hb, byte lb) {
int port = ((int) hb << 8) | ((int) lb & 0xFF);
if (port>=0) {
if (port >= 0) {
return port;
} else {
return 65536 + port;
@ -127,9 +140,10 @@ public class DNSHelper {
}
final protected static char[] hexArray = "0123456789ABCDEF".toCharArray();
public static String bytesToHex(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2];
for ( int j = 0; j < bytes.length; j++ ) {
for (int j = 0; j < bytes.length; j++) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];