Nmap Development mailing list archives
Re: OS Scan & Print Port Output after host timeout
From: Fyodor <fyodor () insecure org>
Date: Wed, 25 Sep 2002 00:02:37 -0700
On Sat, Aug 10, 2002 at 04:31:31PM -0500, Johnson, Greg wrote:
(1) After a host_timeout, could nmap be made to print port output it may have accumulated? Nmap worked so hard to get that info, it's a pity to flush it away.
I'm not convinced that this is worth doing in the base Nmap distribution for the reasons I discussed at http://lists.insecure.org/nmap-dev/2001/Jan-Mar/0001.html . Instead, I am focusing on making the "slow scans" much quicker. For example, see the new --min_parallelism option. I also hope to make SYN scans against massively firewalled hosts much faster even without that option. Unfortunately, UDP scans against certain hosts may always take many hours due to problems like 1-icmp-unreach/second limitations. But at some point I may parallelize the scans of multiple hosts. 24 hours per 50 machines still kinda sucks, but it is far better than 24 hours per machine! I also want Nmap to give more feedback about progress on a certain host (with suitable verbosity (-v) level).
(2) I'd also like after a host_timeout, for nmap to try an os_scan if -O was requested. Slashing from osscan.c 28 lines that deal with global timeout gets me what I want. Is it safe to presume
I dunno ... then I'm sure to get from complaints from people who want host_timeout to really mean "timeout the host afte the given amount of time". As you noted, it is easy to make these sorts of changes to your personal version of Nmap. Woohoo for open source!
(3) Finally, I'd like a SIGHUP to cause nmap to persevere as above: do any os_scan, print port output, and continue with any subsequent host. That requires a little restructuring nmap.c.
Interesting idea. Cheers, Fyodor --------------------------------------------------------------------- For help using this (nmap-dev) mailing list, send a blank email to nmap-dev-help () insecure org . List run by ezmlm-idx (www.ezmlm.org).
Current thread:
- OS Scan & Print Port Output after host timeout Johnson, Greg (Aug 10)
- Re: OS Scan & Print Port Output after host timeout Colin Phipps (Aug 12)
- Re: OS Scan & Print Port Output after host timeout Fyodor (Sep 25)