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-rw-r--r--src/eu/siacs/conversations/utils/DNSHelper.java176
1 files changed, 95 insertions, 81 deletions
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<String> servers = new ArrayList<String>();
- 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);
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 10:18:11 +0000