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send fewer initial UDP packets and send more if successful reply

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This commit is contained in:
Anton Keks 2020-05-12 23:15:28 +03:00
parent 90fee8b568
commit e21f523013
1 changed files with 5 additions and 3 deletions
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src/net/azib/ipscan/core/net/CombinedUnprivilegedPinger.java
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@ -29,15 +29,17 @@ public class CombinedUnprivilegedPinger implements Pinger {
public PingResult ping(ScanningSubject subject, int count) throws IOException {
// try UDP first - it should be more reliable in general
PingResult udpResult = udpPinger.ping(subject, max(1, (int)Math.ceil(count / 1.5)));
if (udpResult.isAlive()) return udpResult;
int udpCountInitialCount = max(1, count / 2);
PingResult udpResult = udpPinger.ping(subject, udpCountInitialCount);
if (udpResult.isAlive())
return udpResult.merge(udpPinger.ping(subject, count - udpCountInitialCount));
// fallback to TCP - it may detect some hosts UDP cannot
PingResult tcpResult = tcpPinger.ping(subject, count);
return tcpResult.merge(udpResult);
}
public void close() throws IOException {
public void close() {
udpPinger.close();
tcpPinger.close();
}