[OpenWrt-Devel] Discussion: Replace BUSYBOX NSLOOKUP by hostip package

[Arjen de Korte]

Citeren Christian Schoenebeck <christian.schoenebeck at gmail.com>:

> For some (good) reason you decided to remove wget from BusyBox and  
> replace it by uclient-fetch.
> Why not also remove nslookup from BusyBox.
> 	- If compiled with musl it malfunction with given dns-server

Correct. It will completely ignore the [SERVER] argument from nslookup  
[HOST] [SERVER] (see [1] & [2]). Either nslookup.c from BusyBox should  
be changed to allow overriding the list of nameservers from  
/etc/resolv.conf (which are the only ones used with the musl library)  
or patched to allow this argument only when compiled against a library  
that actually supports this. I have little hope that musl can be  
convinced to make such functionality available. Note that in many  
cases one can workaround this issue by creating a new /etc/resolv.conf  
with the nameserver(s) to use. By default dnsmasq will not use this  
file, so this will only influence resolving locally (not on clients  
connected).

> 	- use hostip package instead. Tiny and functional

It's not as big as bind-host, but I wouldn't call it tiny either (on  
ar71xx at least). The hostip package (~30k) requires libsodium  
(~120k), which is much higher than the additional size of nslookup in  
BusyBox (which is essentially just a bunch of calls to stuff which is  
already in the libc). Adding the functionality in BusyBox nslookup  
will increase the size of BusyBox somewhat, but not nearly by that  
much. If needed, I can write this.

> What do you think?

I think adding this functionality to BusyBox will be far cheaper in  
terms of size used. Since for many people the [SERVER] argument is not  
going to be used anyway, so switching to hostip by default seems  
overkill. For the time being, people that need this functionality  
should either use a modified /etc/resolv.conf (if possible) or use  
bind-host instead.

Regards, Arjen

[1] https://dev.openwrt.org/ticket/18333
[2] https://dev.openwrt.org/ticket/20893
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