On Thu, Apr 11 2019, Solene Rapenne <[email protected]> wrote:
> Hi
>
> I just wanted to report that misc/mc (midnight commander) won't start if
> your network is set, a gateway is set but doesn't have network access
> because it wants to resolve the system hostname. If no network is
> available, it doesn't try and starts correctly.
>
> tcpdump output when starting mc with network, I modified the dns server to
> 1.1.1.1 to make it more readable. My system hostname is solene.perso.local
>
> 19:13:34.222774 192.168.43.56.4541 > 1.1.1.1.53: 26065+ A?
> solene.perso.local.(36)
> 19:13:34.797038 1.1.1.1.53 > 192.168.43.56.4541: 26065 NXDomain 0/1/0(111)
> [tos 0x50]
> 19:13:34.797261 192.168.43.56.30463 > 1.1.1.1.53: 11960+ A?
> solene.perso.local.perso.local.(48)
> 19:13:34.872702 1.1.1.1.53 > 192.168.43.56.30463: 11960 NXDomain 0/1/0(123)
> [tos 0x50]
> 19:13:34.872931 192.168.43.56.27907 > 1.1.1.1.53: 30605+ A?
> solene.perso.local.(36)
> 19:13:34.941878 1.1.1.1.53 > 192.168.43.56.27907: 30605 NXDomain 0/1/0(111)
> [tos 0x50]
> 19:13:34.943321 192.168.43.56.8533 > 1.1.1.1.53: 15521+ A?
> solene.perso.local.(36)
> 19:13:35.019228 1.1.1.1.53 > 192.168.43.56.8533: 15521 NXDomain 0/1/0(111)
> [tos 0x50]
> 19:13:35.019476 192.168.43.56.42298 > 1.1.1.1.53: 46078+ A?
> solene.perso.local.perso.local.(48)
> 19:13:35.164569 1.1.1.1.53 > 192.168.43.56.42298: 46078 NXDomain 0/1/0(123)
> [tos 0x50]
> 19:13:35.164788 192.168.43.56.41654 > 1.1.1.1.53: 42999+ A?
> solene.perso.local.(36)
> 19:13:35.289600 1.1.1.1.53 > 192.168.43.56.41654: 42999 NXDomain 0/1/0(111)
> [tos 0x50]
>
> I have no idea why mc requires this. It looks like more a bug than a feature
> to
> me. It leaks your hostname to your resolver which is a bit weird.
The asr resolver in libc defaults to "lookup bind file" so DNS is hit
before /etc/hosts. I have "lookup file bind" in resolv.conf{,.tail}.
--
jca | PGP : 0x1524E7EE / 5135 92C1 AD36 5293 2BDF DDCC 0DFA 74AE 1524 E7EE
