The new description should give more clear understanding of when to
edit the option.
I used NixOS to set up a DNS server that is authoritative for certain
zones. The description of the `cacheNetworks` option made me think I
needed to set it to `"any"` to allow people to query the zone I set
up. Reading the source of the module would have clarified my
understanding, but at the time I just read the description and thought
little of it. Later I discovered I was getting tons of DNS requests
and presumably being used for a DNS amplification attack or similar.
I have fixed the problem now, but I would like the option to have a
clearer description so others don't make the same mistake I did.
This is a refactor of how resolvconf is managed on NixOS. We split it
into a separate service which is enabled internally depending on whether
we want /etc/resolv.conf to be managed by it. Various services now take
advantage of those configuration options.
We also now use systemd instead of activation scripts to update
resolv.conf.
NetworkManager now uses the right option for rc-manager DNS
automatically, so the configuration option shouldn't be exposed.
BIND doesn't allow the options section (or any section I'd guess) to be
defined more than once, so whenever you want to set an additional option
you're stuck using weird hacks like this:
services.bind.forwarders = lib.mkForce [ "}; empty-zones-enable no; #" ];
This basically exploits the fact that values coming from the module
options aren't escaped and thus works in a similar vain to how SQL
injection works.
Another option would be to just set configFile to a file that includes
all the options, including zones. That obviously makes the configuration
way less extensible and more awkward to use with the module system.
To make sure this change does work correctly I added a small test just
for that. The test could use some improvements, but better to have a
test rather than none at all. For a future improvement the test could be
merged with the NSD test, because both use the same zone file format.
This change has been reviewed in #40053 and after not getting any
opposition, I'm hereby adding this to master.
Signed-off-by: aszlig <aszlig@nix.build>
Cc: @peti, @edolstra
Closes: #40053
This reverts commit 670b4e29ad. The change
added in this commit was controversial when it was originally suggested
in https://github.com/NixOS/nixpkgs/pull/29205. Then that PR was closed
and a new one opened, https://github.com/NixOS/nixpkgs/pull/29503,
effectively circumventing the review process. I don't agree with this
modification. Adding an option 'resolveLocalQueries' to tell the locally
running name server that it should resolve local DNS queries feels
outright nuts. I agree that the current state is unsatisfactory and that
it should be improved, but this is not the right way.
(cherry picked from commit 23a021d12e)
When the user specifies the networking.nameservers setting in the
configuration file, it must take precedence over automatically
derived settings.
The culprit was services.bind that made the resolver set to
127.0.0.1 and ignore the nameserver setting.
This patch adds a flag to services.bind to override the nameserver
to localhost. It defaults to true. Setting this to false prevents the
service.bind and dnsmasq.resolveLocalQueries settings from
overriding the users' settings.
Also, when the user specifies a domain to search, it must be set in
the resolver configuration, even if the user does not specify any
nameservers.
(cherry picked from commit 670b4e29ad)
This commit was accidentally merged to 17.09 but was intended for
master. This is the cherry-pick to master.
This adds configuration options for the bind package so that the
interfaces that bind listens on can be configured rather than just
hardcoded as any. The default values preserve the old behavior to be
backwards compatible.
Using outputsToInstall the intended behaviour of including host and dnsutils
when bind is installed can be implemented instead of using symlinks to fix
installing all outputs individually with nix-env.
Fixes#19761.
- add missing types in module definitions
- add missing 'defaultText' in module definitions
- wrap example with 'literalExample' where necessary in module definitions
Using pkgs.lib on the spine of module evaluation is problematic
because the pkgs argument depends on the result of module
evaluation. To prevent an infinite recursion, pkgs and some of the
modules are evaluated twice, which is inefficient. Using ‘with lib’
prevents this problem.
