Nmap Development mailing list archives
Re: Slow name-resolution of very large target list
From: Fyodor <fyodor () insecure org>
Date: Thu, 22 May 2008 14:33:03 -0700
On Thu, May 22, 2008 at 09:23:24PM +0000, Brandon Enright wrote:
I'm working on cooking up a perl script to use the adns library. I'm not sure how portable adns is but perhaps we could either look into using it or look into extending Doug's rDNS system to support forward-lookups too. We could have the --system-dns fall back on gethostbyname(). Perhaps it is rare enough for someone to be doing what I'm doing that it isn't worth the effort?
Well, I'm not opposed to Nmap doing its own forward DNS if the patch is reasonbly small (no need to use adns -- we don't use that for rdns) and it is also very reliable. Even if we just do them one at a time as they are encountered in TargetGroup.cc, it could speed things up quite a bit because you don't have to wait 30 seconds or a minute or whatever rediculous amount of time gethostbyname() waits for resolution before it gives up. Or maybe there are environmental variables we could set on Linux or other ways to speed up gethostbyname()? Cheers, -F _______________________________________________ Sent through the nmap-dev mailing list http://cgi.insecure.org/mailman/listinfo/nmap-dev Archived at http://SecLists.Org
Current thread:
- Slow name-resolution of very large target list Brandon Enright (May 22)
- Re: Slow name-resolution of very large target list Fyodor (May 22)
- Re: Slow name-resolution of very large target list Brandon Enright (May 22)
- Re: Slow name-resolution of very large target list Fyodor (May 22)
- Re: Slow name-resolution of very large target list doug (May 22)
- Re: Slow name-resolution of very large target list Brandon Enright (May 22)
- Re: Slow name-resolution of very large target list doug (May 24)
- Re: Slow name-resolution of very large target list Brandon Enright (May 22)
- Re: Slow name-resolution of very large target list Fyodor (May 22)