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External IP address updates now require 10 consecutive readings.

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This commit is contained in:
CalDescent 2022-01-12 19:19:56 +00:00
parent 4e1b0a25bb
commit 90836afd91
1 changed files with 31 additions and 15 deletions
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46
src/main/java/org/qortal/network/Network.java
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@ -1113,6 +1113,7 @@ public class Network {
return;
}
// Validate IP address
String[] parts = peerAddress.split(":");
if (parts.length != 2) {
return;
@ -1128,32 +1129,47 @@ public class Network {
return;
}
// Add to the list
this.ourExternalIpAddressHistory.add(host);
// Limit to 10 entries
while (this.ourExternalIpAddressHistory.size() > 10) {
// Limit to 25 entries
while (this.ourExternalIpAddressHistory.size() > 25) {
this.ourExternalIpAddressHistory.remove(0);
}
// If we've had 3 consecutive matching addresses, and they're different from
// If we've had 10 consecutive matching addresses, and they're different from
// our stored IP address value, treat it as updated.
int consecutiveReadingsRequired = 10;
int size = this.ourExternalIpAddressHistory.size();
if (size < 3) {
// Need at least 3 readings
if (size < consecutiveReadingsRequired) {
// Need at least 10 readings
return;
}
String ip1 = this.ourExternalIpAddressHistory.get(size - 1);
String ip2 = this.ourExternalIpAddressHistory.get(size - 2);
String ip3 = this.ourExternalIpAddressHistory.get(size - 3);
// Count the number of consecutive IP address readings
String lastReading = null;
int consecutiveReadings = 0;
for (int i = size-1; i >= 0; i--) {
String reading = this.ourExternalIpAddressHistory.get(i);
if (lastReading != null) {
if (Objects.equals(reading, lastReading)) {
consecutiveReadings++;
}
else {
consecutiveReadings = 0;
}
}
lastReading = reading;
}
if (!Objects.equals(ip1, this.ourExternalIpAddress)) {
// Latest reading doesn't match our known value
if (Objects.equals(ip1, ip2) && Objects.equals(ip1, ip3)) {
// Last 3 readings were the same - i.e. more than one peer agreed on the new IP address
this.ourExternalIpAddress = ip1;
this.onExternalIpUpdate(ip1);
if (consecutiveReadings >= consecutiveReadingsRequired) {
// Last 10 readings were the same - i.e. more than one peer agreed on the new IP address...
String ip = this.ourExternalIpAddressHistory.get(size - 1);
if (!Objects.equals(ip, this.ourExternalIpAddress)) {
// ... and the readings were different to our current recorded value, so
// update our external IP address value
this.ourExternalIpAddress = ip;
this.onExternalIpUpdate(ip);
}
}
}