default timeout on UDP scanning can make scan hang very long

[chux0r]

Testing on updates for v0.43 reminded that udp scan will hang there for way too long (killed after 1 min, 4 ports out of "udp_short" default complete).

• Do more testing on UDP scan to document default timeout and how long scans take, baseline on scanme.org
• Set a more reasonable default timeout for UDP scanning
• • If the operater wants accuracy, do they have to let everything wait until they timeout? Or is there a threashold where anyone may reasonably assume the thing ain't going to respond? Answer this

[chux0r]

See also #24 - timeout flag may not work at all

[chux0r]

fixed #24, but this issue still persists.

mongoose@thoughtcrime:~/workbench/dev/golang/netbang$ ./netbang -proto udp -p "161" -t 500 scanme.org

Bang target: [scanme.org], Portcount: [1]
=====================================================
UDP portbangers unleashed...^C

[chux0r]

UDP scans need root? Just noticed they do in nmap... hmmm