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server_resolver.go
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/
server_resolver.go
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package server
import (
"context"
"github.com/miekg/dns"
"darvaza.org/resolver/pkg/errors"
"darvaza.org/resolver/pkg/exdns"
"darvaza.org/slog"
"darvaza.org/penne/pkg/resolver"
)
var (
_ dns.Handler = (*Server)(nil)
)
func defaultResolvers() []resolver.Config {
return []resolver.Config{
{
Name: "root",
Iterative: true,
},
}
}
func (srv *Server) initResolvers() error {
// prepare resolver debug map
srv.rd = make(map[string]slog.LogLevel)
// build resolvers
opts := &resolver.Options{
Logger: srv.cfg.Logger,
}
_, res, err := resolver.MakeResolvers(srv.cfg.Resolvers, srv.rd, opts)
if err != nil {
return err
}
// store
srv.res = res
return nil
}
func (srv *Server) reflectEnabled(_ context.Context, name string) (slog.LogLevel, bool) {
level, ok := srv.rd[name]
return level, ok
}
// ServeDNS handles dns requests based on the IP address of the client
func (srv *Server) ServeDNS(rw dns.ResponseWriter, req *dns.Msg) {
var chaos bool
exdns.ForEachQuestionOfClass(req, dns.ClassCHAOS, func(_ dns.Question) {
chaos = true
})
if chaos {
// route CHAOS requests directly to ExchangeCHAOS
ctx := context.Background()
rsp, err := srv.ExchangeCHAOS(ctx, req)
if err != nil {
rsp = errors.ErrorAsMsg(req, err)
}
_ = rw.WriteMsg(rsp)
return
}
srv.z.ServeDNS(rw, req)
}