The current CLI does not support a way to clear these lists, since without any
additional arguments, the command will list the current values.
Introduce a new way to clear the lists by passing a single '' argument to these
subcommands.
Update the man page to document this.
Tested:
$ build/resolvectl domain eth1
Link 3 (eth1): ~.
$ build/resolvectl domain eth1 ''
$ build/resolvectl domain eth1
Link 3 (eth1):
$ build/resolvectl domain eth1 '~.' '~example.com'
$ build/resolvectl domain eth1
Link 3 (eth1): ~. ~example.com
$ build/resolvectl domain eth1 ''
$ build/resolvectl domain eth1
Link 3 (eth1):
$ build/resolvectl domain eth1 '~.'
$ build/resolvectl domain eth1
Link 3 (eth1): ~.
And similar for "dns" and "nta".
Also use compat_main() when called as `resolvconf`, since the interface
is closer to that of `systemd-resolve`.
Use a heap allocated string to set arg_ifname, since a stack allocated
one would be lost after the function returns. (This last one broke the
case where an interface name was suffixed with a dot, such as in
`resolvconf -a tap0.dhcp`.)
Tested:
$ build/resolvconf -a nonexistent.abc </etc/resolv.conf
Unknown interface 'nonexistent': No such device
Fixes#9423.
This part of the copyright blurb stems from the GPL use recommendations:
https://www.gnu.org/licenses/gpl-howto.en.html
The concept appears to originate in times where version control was per
file, instead of per tree, and was a way to glue the files together.
Ultimately, we nowadays don't live in that world anymore, and this
information is entirely useless anyway, as people are very welcome to
copy these files into any projects they like, and they shouldn't have to
change bits that are part of our copyright header for that.
hence, let's just get rid of this old cruft, and shorten our codebase a
bit.
Previously we were a bit sloppy with the index and size types of arrays,
we'd regularly use unsigned. While I don't think this ever resulted in
real issues I think we should be more careful there and follow a
stricter regime: unless there's a strong reason not to use size_t for
array sizes and indexes, size_t it should be. Any allocations we do
ultimately will use size_t anyway, and converting forth and back between
unsigned and size_t will always be a source of problems.
Note that on 32bit machines "unsigned" and "size_t" are equivalent, and
on 64bit machines our arrays shouldn't grow that large anyway, and if
they do we have a problem, however that kind of overly large allocation
we have protections for usually, but for overflows we do not have that
so much, hence let's add it.
So yeah, it's a story of the current code being already "good enough",
but I think some extra type hygiene is better.
This patch tries to be comprehensive, but it probably isn't and I missed
a few cases. But I guess we can cover that later as we notice it. Among
smaller fixes, this changes:
1. strv_length()' return type becomes size_t
2. the unit file changes array size becomes size_t
3. DNS answer and query array sizes become size_t
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=76745
This makes `resolvectl` use the verb style command line, e.g.,
`resolvectl status` or `resolvectl tlsa tcp fedoraproject.org:443`.
For compatibility, if the invocation name is `systemd-resolve`,
then it accepts the old syntax, e.g. `systemd-resolve --status`.
