Nmap Development mailing list archives
Re: Windows interfaces GUIDs issue caused reverse DNS resolution to fail
From: Daniel Miller <bonsaiviking () gmail com>
Date: Mon, 28 Nov 2016 00:29:03 -0600
Robert, Thanks so much for the analysis! We had seen reports of this error, but had not been able to narrow it down to a cause. I'll verify and apply your fix right away. Dan On Nov 24, 2016 1:07 AM, "Robert Croteau" <robert.croteau () quest com> wrote:
Hi all, I installed the windows version of 7.31 on Windows Server 2016 and I couldn’t get the reverse DNS hostname in the results. The following message: “mass_dns: warning: Unable to determine any DNS servers. Reverse DNS is disabled. Try using --system-dns or specify valid servers with --dns-servers” appeared in the output. I could also get the following message if I installed winpcap first then installed nmap (with npcap): “Interface XXXXXXX is not known; ignoring its nameservers.” It seems the following code is the culprit: nmap_dns.cc :940 if (strcmp(guid, pcap_guid) == 0) return true; should be changed to if (strcasecmp(guid, pcap_guid) == 0) return true; The issue seems to be that an interface GUID in HKEY_LOCAL_MACHINE\SYSTEM\ CurrentControlSet\services\Tcpip\Parameters\Interfaces can either be defined in uppercase or lowercase but internally to nmap (from npcap?) the interface list is saved as uppercase. So in my case, my interfaces were lowercase and did not match the interfaces from the list returned by getinterfaces() in interface_is_known_by_guid(). Using strcasecmp() instead of strcmp() solved the problem. Hope this helps. Thanks *Robert-André Croteau* _______________________________________________ Sent through the dev mailing list https://nmap.org/mailman/listinfo/dev Archived at http://seclists.org/nmap-dev/
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Current thread:
- Windows interfaces GUIDs issue caused reverse DNS resolution to fail Robert Croteau (Nov 23)
- Re: Windows interfaces GUIDs issue caused reverse DNS resolution to fail Daniel Miller (Nov 27)