.Dd October 7, 2021
.Dt DNSCONFIG 8
.Os
.Sh NAME
.Nm dnsconfig
.Nd configure kernel DNS resolver list
.Sh SYNOPSIS
.Nm
.Nm
.Ar resolver ...
.Nm
.Fl s
.Op Ar resolver ...
.Nm
.Fl a
.Op Ar resolver ...
.Nm
.Fl d
.Op Ar resolver ...
.Sh DESCRIPTION
.Nm
writes the current kernel DNS resolver list, or modifies it if any resolvers are
specified.
.Pp
The options are as follows:
.Bl -tag -width "12345678"
.It Fl a
Append resolvers to the list.
.It Fl d
Delete resolvers from the list.
.It Fl s
Set the resolver list.
This option is the default if
.Nm
is invoked with any resolvers.
.El
.Sh EXIT STATUS
.Nm
will exit 0 on success and non-zero otherwise.
.Sh EXAMPLES
Get the resolvers:
.Bd -literal
$ dnsconfig
192.0.2.1
.Ed
.Pp
Set two resolvers:
.Bd -literal
# dnsconfig 192.0.2.15 192.0.2.100
# dnsconfig
192.0.2.15
192.0.2.100
.Ed
.Pp
Set the resolvers to the empty list:
.Bd -literal
# dnsconfig -s
# dnsconfig
.Ed
.Pp
Append a resolver:
.Bd -literal
# dnsconfig 192.0.2.128
# dnsconfig -a 192.0.2.40
# dnsconfig
192.0.2.128
192.0.2.40
.Ed
.Pp
Delete a resolver:
.Bd -literal
# dnsconfig -d 192.0.2.128
# dnsconfig
192.0.2.40
.Ed
.Sh SEE ALSO
.Xr getdnsconfig 2 ,
.Xr setdnsconfig 2 ,
.Xr inet 4 ,
.Xr ifconfig 8
.Sh HISTORY
.Nm
originally appeared in Sortix 1.1.
.Sh CAVEATS
The kernel DNS resolver list is global state.
Changes made with
.Nm
may be overwritten by other programs.