Introduce a new resolvconf_invoke function that takes care of all the
details of invoking resolvconf and simplify the code a bit.
Introduce have_dns that tracks whether DNS servers were actually
provided. If no DNS info was provided, do not invoke resolvconf to
remove it.
Instead of interface index, resolvconf is now invoked with the printable
name of the interface and the dns entries are placed in the "dns"
protocol. This makes it a bit simpler to add additional info to
resolvconf instead of trying to generate a monolithic entry.
Resolve module does not currently track any state that has been set on
a per ifindex basis. This was okay while the set of information we
supported was quite small. However, with dhcpv6 support being prepared,
a more flexible framework is needed.
Change the resolve API to allocate and return an instance for a given
ifindex that has the ability to track information that was provided.
The intent was to check for the presence of the add_domain_name
operation, not add_dns operation.
Fixes: 930528e35e ("resolve: Add systemd-resolved domain name installer")
method.ops is NULL, which causes method.ops->exit to crash. This
adds a check that method.ops is not NULL before dereferencing.
Fixes:
Aborting (signal 11) [/home/jprestwo/iwd/src/iwd]
++++++++ backtrace ++++++++
0 0x7f016b59cf20 in /lib/x86_64-linux-gnu/libc.so.6
1 0x432057 in resolve_exit() at /home/jprestwo/iwd/src/resolve.c:295
2 0x403b61 in iwd_modules_exit() at /home/jprestwo/iwd/src/main.c:195
3 0x7f016b57fb97 in /lib/x86_64-linux-gnu/libc.so.6
+++++++++++++++++++++++++++
The framework enables the service specific implementations
to provide its own variations for the DNS installation tasks.
The selection of the address resolution service can be done
through dns_resolve_method setting.
The module is responsible for the configuration of the address
resolution services. It will consist of the multiple service
specific plugins such as: systemd-resolved plugin, dnsmasq
plugin, etc.
