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authorDaniel Gultsch <daniel@gultsch.de>2015-06-19 16:25:08 +0200
committerDaniel Gultsch <daniel@gultsch.de>2015-06-19 16:25:08 +0200
commit5a48afdd4d44b5865831df470a2c5d00e9cc9599 (patch)
tree196a29b71b574c9aaa3a737001095b8f56262237 /src/main/java/eu/siacs/conversations/utils
parent58201b440856a60d45d3a72cf6aaacd3a36dc828 (diff)
don't perform dns lookups on domain parts that obviously look like ip addresses
Diffstat (limited to 'src/main/java/eu/siacs/conversations/utils')
-rw-r--r--src/main/java/eu/siacs/conversations/utils/DNSHelper.java24
1 files changed, 14 insertions, 10 deletions
diff --git a/src/main/java/eu/siacs/conversations/utils/DNSHelper.java b/src/main/java/eu/siacs/conversations/utils/DNSHelper.java
index 6f414ccc..bb354ae0 100644
--- a/src/main/java/eu/siacs/conversations/utils/DNSHelper.java
+++ b/src/main/java/eu/siacs/conversations/utils/DNSHelper.java
@@ -20,11 +20,19 @@ import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;
import java.util.TreeMap;
+import java.util.regex.Pattern;
import android.os.Bundle;
import android.util.Log;
public class DNSHelper {
+
+ public static final Pattern PATTERN_IPV4 = Pattern.compile("\\A(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}\\z");
+ public static final Pattern PATTERN_IPV6_HEX4DECCOMPRESSED = Pattern.compile("\\A((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?) ::((?:[0-9A-Fa-f]{1,4}:)*)(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}\\z");
+ public static final Pattern PATTERN_IPV6_6HEX4DEC = Pattern.compile("\\A((?:[0-9A-Fa-f]{1,4}:){6,6})(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}\\z");
+ public static final Pattern PATTERN_IPV6_HEXCOMPRESSED = Pattern.compile("\\A((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)\\z");
+ public static final Pattern PATTERN_IPV6 = Pattern.compile("\\A(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}\\z");
+
protected static Client client = new Client();
public static Bundle getSRVRecord(final Jid jid) throws IOException {
@@ -160,15 +168,11 @@ public class DNSHelper {
return namePort;
}
- 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);
+ public static boolean isIp(final String server) {
+ return PATTERN_IPV4.matcher(server).matches()
+ || PATTERN_IPV6.matcher(server).matches()
+ || PATTERN_IPV6_6HEX4DEC.matcher(server).matches()
+ || PATTERN_IPV6_HEX4DECCOMPRESSED.matcher(server).matches()
+ || PATTERN_IPV6_HEXCOMPRESSED.matcher(server).matches();
}
}