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increase scan group sizes in many cases, also make them normally powers of two to better align with common network boundaries (e.g. /24, /25, etc.)

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fyodor
2008-07-11 07:30:00 +00:00
parent 7f9dff09c3
commit aec77b87e8
1 changed files with 14 additions and 6 deletions
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20
scan_engine.cc
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@@ -1665,15 +1665,23 @@ int UltraScanInfo::removeCompletedHosts() {
levels. */
int determineScanGroupSize(int hosts_scanned_so_far,
struct scan_lists *ports) {
int groupsize = 10;
int groupsize = 16;
if (o.UDPScan())
groupsize = 50;
groupsize = 128;
else if (o.TCPScan()) {
groupsize = MAX(1024 / (ports->tcp_count ? ports->tcp_count : 1), 30);
if (ports->tcp_count > 1000 && hosts_scanned_so_far == 0 &&
o.timing_level < 4)
groupsize = 5; // Give quick results for the very first batch
groupsize = MAX(1024 / (ports->tcp_count ? ports->tcp_count : 1), 64);
if (ports->tcp_count > 1000 && o.timing_level <= 4) {
int quickgroupsz = 4;
if (o.timing_level == 4) quickgroupsz = 8;
if (hosts_scanned_so_far == 0)
groupsize = quickgroupsz; // Give quick results for the very first batch
else if (hosts_scanned_so_far == quickgroupsz &&
groupsize > quickgroupsz * 2)
/* account for initial quick-scan to keep us aligned
on common network boundaries (e.g. /24) */
groupsize -= quickgroupsz;
}
}
groupsize = box(o.minHostGroupSz(), o.maxHostGroupSz(), groupsize);