From 8988873d77bfab1a0788f3e1dbe051fceb879321 Mon Sep 17 00:00:00 2001 From: Daniel Gultsch Date: Thu, 27 Mar 2014 14:31:55 +0100 Subject: more dns fixes. hopefully the last --- src/eu/siacs/conversations/utils/DNSHelper.java | 176 +++++++++++++----------- 1 file changed, 95 insertions(+), 81 deletions(-) (limited to 'src/eu/siacs') diff --git a/src/eu/siacs/conversations/utils/DNSHelper.java b/src/eu/siacs/conversations/utils/DNSHelper.java index aa9f8057..5ed9d9f5 100644 --- a/src/eu/siacs/conversations/utils/DNSHelper.java +++ b/src/eu/siacs/conversations/utils/DNSHelper.java @@ -17,19 +17,24 @@ 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 servers = new ArrayList(); - 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)) - ip = InetAddress.getByName(value); - servers.add(value); - Bundle result = queryDNS(host, ip); - if (!result.containsKey("error")) { - return result; - } + 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)) { + ip = InetAddress.getByName(value); + servers.add(value); + Bundle result = queryDNS(host, ip); + if (!result.containsKey("error")) { + return result; + } + } } } catch (ClassNotFoundException e) { ip = InetAddress.getByName("8.8.8.8"); @@ -44,74 +49,82 @@ public class DNSHelper { } return queryDNS(host, ip); } - + 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); - String[] hostParts = host.split("\\."); - byte[] transId = new byte[2]; - Random random = new Random(); - random.nextBytes(transId); - byte[] header = { 0x01, 0x20, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x01, 0x0c, 0x5f, 0x78, 0x6d, 0x70, 0x70, 0x2d, 0x63, - 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x04, 0x5f, 0x74, 0x63, 0x70 }; - byte[] rest = { 0x00, 0x00, 0x21, 0x00, 0x01, 0x00, 0x00, 0x29, - 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; - ByteArrayOutputStream output = new ByteArrayOutputStream(); - output.write(transId); - output.write(header); - for (int i = 0; i < hostParts.length; ++i) { - char[] tmpChars = hostParts[i].toCharArray(); - byte[] tmp = new byte[tmpChars.length]; - for (int j = 0; j < tmpChars.length; ++j) { - tmp[j] = (byte) tmpChars[j]; + 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(); + random.nextBytes(transId); + byte[] header = { 0x01, 0x20, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x01, 0x0c, 0x5f, 0x78, 0x6d, 0x70, 0x70, 0x2d, 0x63, + 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x04, 0x5f, 0x74, 0x63, 0x70 }; + byte[] rest = { 0x00, 0x00, 0x21, 0x00, 0x01, 0x00, 0x00, 0x29, + 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; + ByteArrayOutputStream output = new ByteArrayOutputStream(); + output.write(transId); + output.write(header); + for (int i = 0; i < hostParts.length; ++i) { + char[] tmpChars = hostParts[i].toCharArray(); + byte[] tmp = new byte[tmpChars.length]; + for (int j = 0; j < tmpChars.length; ++j) { + tmp[j] = (byte) tmpChars[j]; + } + output.write(tmp.length); + output.write(tmp); } - output.write(tmp.length); - output.write(tmp); - } - output.write(rest); - byte[] sendPaket = output.toByteArray(); - int realLenght = sendPaket.length - 11; - DatagramPacket packet = new DatagramPacket(sendPaket, - sendPaket.length, dnsServer, 53); - DatagramSocket datagramSocket = new DatagramSocket(); - datagramSocket.send(packet); - byte[] receiveData = new byte[1024]; + output.write(rest); + byte[] sendPaket = output.toByteArray(); + int realLenght = sendPaket.length - 11; + DatagramPacket packet = new DatagramPacket(sendPaket, + sendPaket.length, dnsServer, 53); + DatagramSocket datagramSocket = new DatagramSocket(); + datagramSocket.send(packet); + byte[] receiveData = new byte[1024]; - DatagramPacket receivePacket = new DatagramPacket(receiveData, - receiveData.length); - datagramSocket.setSoTimeout(3000); - datagramSocket.receive(receivePacket); - if (receiveData[3]!=-128) { - namePort.putString("error", "nosrv"); - return namePort; - } - namePort.putInt("port",calcPort(receiveData[realLenght + 16], - receiveData[realLenght + 17])); - int i = realLenght + 18; - int wordLenght = 0; - StringBuilder builder = new StringBuilder(); - while (receiveData[i] != 0) { - if (wordLenght > 0) { - builder.append((char) receiveData[i]); - --wordLenght; + DatagramPacket receivePacket = new DatagramPacket(receiveData, + receiveData.length); + datagramSocket.setSoTimeout(3000); + datagramSocket.receive(receivePacket); + if (receiveData[3] != -128) { + Log.d("xmppService", "not the right count"); + namePort.putString("error", "nosrv"); + return namePort; + } + namePort.putInt( + "port", + calcPort(receiveData[realLenght + 16], + receiveData[realLenght + 17])); + int i = realLenght + 18; + int wordLenght = 0; + StringBuilder builder = new StringBuilder(); + while (receiveData[i] != 0) { + if (wordLenght > 0) { + builder.append((char) receiveData[i]); + --wordLenght; + } else { + wordLenght = receiveData[i]; + builder.append("."); + } + ++i; + } + builder.replace(0, 1, ""); + byte type = receiveData[i + 1]; + byte type2 = receiveData[i + 2]; + if ((type == -64) || (type == type2)) { + namePort.putString("name", builder.toString()); + return namePort; } else { - wordLenght = receiveData[i]; - builder.append("."); + Log.d("xmppService", "type=" + type + " type2=" + type2 + " " + + builder.toString()); + namePort.putString("error", "nosrv"); + return namePort; } - ++i; - } - builder.replace(0, 1, ""); - byte type = receiveData[i+1]; - if (type!=-64) { - 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; } @@ -119,21 +132,22 @@ 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; } } - + 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++ ) { - int v = bytes[j] & 0xFF; - hexChars[j * 2] = hexArray[v >>> 4]; - hexChars[j * 2 + 1] = hexArray[v & 0x0F]; - } - return new String(hexChars); + char[] hexChars = new char[bytes.length * 2]; + 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]; + } + return new String(hexChars); } } -- cgit v1.2.3