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coredns plugin -- convert logic into switch, logging unexpected non-covered cases

This commit is contained in:
Eugene Bujak 2018-09-06 02:09:57 +03:00
parent fe397943d6
commit c7a5275d42
1 changed files with 36 additions and 31 deletions
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67
coredns_plugin/coredns_plugin.go
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@ -411,39 +411,44 @@ func (d *Plugin) serveDNSInternal(ctx context.Context, w dns.ResponseWriter, r *
return dns.RcodeServerFailure, fmt.Errorf("plugin/dnsfilter: %s", err), dnsfilter.Result{}
}
// safebrowsing
if result.IsFiltered == true && result.Reason == dnsfilter.FilteredSafeBrowsing {
// return cname safebrowsing.block.dns.adguard.com
val := d.SafeBrowsingBlockHost
rcode, err := d.replaceHostWithValAndReply(ctx, w, r, host, val, question)
if err != nil {
return rcode, err, dnsfilter.Result{}
if result.IsFiltered {
switch result.Reason {
case dnsfilter.FilteredSafeBrowsing:
// return cname safebrowsing.block.dns.adguard.com
val := d.SafeBrowsingBlockHost
rcode, err := d.replaceHostWithValAndReply(ctx, w, r, host, val, question)
if err != nil {
return rcode, err, dnsfilter.Result{}
}
return rcode, err, result
case dnsfilter.FilteredParental:
// return cname family.block.dns.adguard.com
val := d.ParentalBlockHost
rcode, err := d.replaceHostWithValAndReply(ctx, w, r, host, val, question)
if err != nil {
return rcode, err, dnsfilter.Result{}
}
return rcode, err, result
case dnsfilter.FilteredBlackList:
// return NXdomain
rcode, err := writeNXdomain(ctx, w, r)
if err != nil {
return rcode, err, dnsfilter.Result{}
}
return rcode, err, result
default:
log.Printf("SHOULD NOT HAPPEN -- got unknown reason for filtering: %T %v %s", result.Reason, result.Reason, result.Reason.String())
}
return rcode, err, result
}
// parental
if result.IsFiltered == true && result.Reason == dnsfilter.FilteredParental {
// return cname
val := d.ParentalBlockHost
rcode, err := d.replaceHostWithValAndReply(ctx, w, r, host, val, question)
if err != nil {
return rcode, err, dnsfilter.Result{}
} else {
switch result.Reason {
case dnsfilter.NotFilteredWhiteList:
rcode, err := plugin.NextOrFailure(d.Name(), d.Next, ctx, w, r)
return rcode, err, result
case dnsfilter.NotFilteredNotFound:
// do nothing, pass through to lower code
default:
log.Printf("SHOULD NOT HAPPEN -- got unknown reason for not filtering: %T %v %s", result.Reason, result.Reason, result.Reason.String())
}
return rcode, err, result
}
// blacklist
if result.IsFiltered == true && result.Reason == dnsfilter.FilteredBlackList {
rcode, err := writeNXdomain(ctx, w, r)
if err != nil {
return rcode, err, dnsfilter.Result{}
}
return rcode, err, result
}
if result.IsFiltered == false && result.Reason == dnsfilter.NotFilteredWhiteList {
rcode, err := plugin.NextOrFailure(d.Name(), d.Next, ctx, w, r)
return rcode, err, result
}
}
rcode, err := plugin.NextOrFailure(d.Name(), d.Next, ctx, w, r)