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Diffstat (limited to 'src/de/blinkt/openvpn/CIDRIP.java')
-rw-r--r--src/de/blinkt/openvpn/CIDRIP.java56
1 files changed, 56 insertions, 0 deletions
diff --git a/src/de/blinkt/openvpn/CIDRIP.java b/src/de/blinkt/openvpn/CIDRIP.java
new file mode 100644
index 00000000..c2f0d821
--- /dev/null
+++ b/src/de/blinkt/openvpn/CIDRIP.java
@@ -0,0 +1,56 @@
+package de.blinkt.openvpn;
+
+class CIDRIP{
+ String mIp;
+ int len;
+ public CIDRIP(String ip, String mask){
+ mIp=ip;
+ String[] ipt = mask.split("\\.");
+ long netmask=0;
+
+ netmask += Long.parseLong(ipt[0])<< 24;
+ netmask += Integer.parseInt(ipt[1])<< 16;
+ netmask += Integer.parseInt(ipt[2])<< 8;
+ netmask += Integer.parseInt(ipt[3]);
+
+ // Add 33. bit to ensure the loop terminates
+ netmask += 1l << 32;
+
+ int lenZeros = 0;
+ while((netmask & 0x1) == 0) {
+ lenZeros++;
+ netmask = netmask >> 1;
+ }
+ // Check if rest of netmask is only 1s
+ if(netmask != (0x1ffffffffl >> lenZeros)) {
+ // Asume no CIDR, set /32
+ len=32;
+ } else {
+ len =32 -lenZeros;
+ }
+
+ }
+ @Override
+ public String toString() {
+ return String.format("%s/%d",mIp,len);
+ }
+
+ public boolean normalise(){
+ long ip=0;
+
+ String[] ipt = mIp.split("\\.");
+
+ ip += Long.parseLong(ipt[0])<< 24;
+ ip += Integer.parseInt(ipt[1])<< 16;
+ ip += Integer.parseInt(ipt[2])<< 8;
+ ip += Integer.parseInt(ipt[3]);
+
+ long newip = ip & (0xffffffffl << (32 -len));
+ if (newip != ip){
+ mIp = String.format("%d.%d.%d.%d", (newip & 0xff000000) >> 24,(newip & 0xff0000) >> 16, (newip & 0xff00) >> 8 ,newip & 0xff);
+ return true;
+ } else {
+ return false;
+ }
+ }
+} \ No newline at end of file