Re: route_dst_netlink: can't find interface "tap0"

[David Fifield <david () bamsoftware com>]

On Wed, Oct 03, 2012 at 05:25:34PM +0100, Chris wrote:
> Hi guys,
>
> First off congrats on you're excellent work :)
>
> I'm using r29928 from the SVN repository.
>
> I'm just having problems with nmap not recognising a particular interface.
>
> If I run a connect scan as a normal user, chris@icarus:~/Desktop$ nmap
> 192.168.1.222
> It works fine.
>
> If I run the same connect scan as a root user:
>
> Starting Nmap 6.02 ( http://nmap.org ) at 2012-10-03 14:43 BST
> route_dst_netlink: can't find interface "tap0"
>
> Even though "ifconfig tap0" shows the interface is up:
>
> tap0      Link encap:Ethernet  HWaddr 4a:40:62:24:53:5e
>           inet6 addr: fe80::4840:62ff:fe24:535e/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:10116775 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:10105187 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:500
>           RX bytes:1058003528 (1.0 GB)  TX bytes:989857608 (989.8 MB)
>
> Additionally:
>
> chris@icarus:~/moving$ sudo nmap --iflist
> [sudo] password for chris:
>
> Starting Nmap 6.02 ( http://nmap.org ) at 2012-10-03 17:18 BST
> ************************INTERFACES************************
> DEV   (SHORT) IP/MASK                      TYPE     UP MTU   MAC
> tap0  (tap0)  (null)/0                     ethernet up 1500  4A:40:62:24:53:5E
> tap0  (tap0)  fe80::4840:62ff:fe24:535e/64 ethernet up 1500  4A:40:62:24:53:5E

I think the error here is the tap0 interface has no address configured,
and so the interface entry has an af of AF_UNSPEC, not AF_INET, so
getInterfaceByName doesn't find it. The routing loop shouldn't quit just
for this.

Please try this patch, which adds a fallback search for AF_UNSPEC.

David Fifield

Attachment: route_dst_netlink-AF_UNSPEC.patch
Description:

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