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dns: remove goto INVALID and a naked return 

This commit is one small step toward modernizing and making the DNSServer readable.
This commit is contained in:
Daniel Nephin 2020-10-21 15:16:03 -04:00
parent 6513faf14c
commit 9b1944dae0
1 changed files with 24 additions and 25 deletions
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49
agent/dns.go
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@ -592,8 +592,7 @@ func (d *DNSServer) parseDatacenter(labels []string, datacenter *string) bool {
// doDispatch is used to parse a request and invoke the correct handler.
// parameter maxRecursionLevel will handle whether recursive call can be performed
func (d *DNSServer) doDispatch(network string, remoteAddr net.Addr, req, resp *dns.Msg, maxRecursionLevel int) (ecsGlobal bool) {
ecsGlobal = true
func (d *DNSServer) doDispatch(network string, remoteAddr net.Addr, req, resp *dns.Msg, maxRecursionLevel int) bool {
// By default the query is in the default datacenter
datacenter := d.agent.config.Datacenter
@ -633,19 +632,26 @@ func (d *DNSServer) doDispatch(network string, remoteAddr net.Addr, req, resp *d
}
}
invalid := func() bool {
d.logger.Warn("QName invalid", "qname", qName)
d.addSOA(cfg, resp)
resp.SetRcode(req, dns.RcodeNameError)
return true
}
if queryKind == "" {
goto INVALID
return invalid()
}
switch queryKind {
case "service":
n := len(queryParts)
if n < 1 {
goto INVALID
return invalid()
}
if !d.parseDatacenterAndEnterpriseMeta(querySuffixes, cfg, &datacenter, &entMeta) {
goto INVALID
return invalid()
}
lookup := serviceLookup{
@ -689,11 +695,11 @@ func (d *DNSServer) doDispatch(network string, remoteAddr net.Addr, req, resp *d
}
case "connect":
if len(queryParts) < 1 {
goto INVALID
return invalid()
}
if !d.parseDatacenterAndEnterpriseMeta(querySuffixes, cfg, &datacenter, &entMeta) {
goto INVALID
return invalid()
}
lookup := serviceLookup{
@ -709,11 +715,11 @@ func (d *DNSServer) doDispatch(network string, remoteAddr net.Addr, req, resp *d
d.serviceLookup(cfg, lookup, req, resp)
case "ingress":
if len(queryParts) < 1 {
goto INVALID
return invalid()
}
if !d.parseDatacenterAndEnterpriseMeta(querySuffixes, cfg, &datacenter, &entMeta) {
goto INVALID
return invalid()
}
lookup := serviceLookup{
@ -729,11 +735,11 @@ func (d *DNSServer) doDispatch(network string, remoteAddr net.Addr, req, resp *d
d.serviceLookup(cfg, lookup, req, resp)
case "node":
if len(queryParts) < 1 {
goto INVALID
return invalid()
}
if !d.parseDatacenter(querySuffixes, &datacenter) {
goto INVALID
return invalid()
}
// Allow a "." in the node name, just join all the parts
@ -742,22 +748,22 @@ func (d *DNSServer) doDispatch(network string, remoteAddr net.Addr, req, resp *d
case "query":
// ensure we have a query name
if len(queryParts) < 1 {
goto INVALID
return invalid()
}
if !d.parseDatacenter(querySuffixes, &datacenter) {
goto INVALID
return invalid()
}
// Allow a "." in the query name, just join all the parts.
query := strings.Join(queryParts, ".")
ecsGlobal = false
d.preparedQueryLookup(cfg, network, datacenter, query, remoteAddr, req, resp, maxRecursionLevel)
return false
case "addr":
// <address>.addr.<suffixes>.<domain> - addr must be the second label, datacenter is optional
if len(queryParts) != 1 {
goto INVALID
return invalid()
}
switch len(queryParts[0]) / 2 {
@ -765,7 +771,7 @@ func (d *DNSServer) doDispatch(network string, remoteAddr net.Addr, req, resp *d
case 4:
ip, err := hex.DecodeString(queryParts[0])
if err != nil {
goto INVALID
return invalid()
}
resp.Answer = append(resp.Answer, &dns.A{
@ -781,7 +787,7 @@ func (d *DNSServer) doDispatch(network string, remoteAddr net.Addr, req, resp *d
case 16:
ip, err := hex.DecodeString(queryParts[0])
if err != nil {
goto INVALID
return invalid()
}
resp.Answer = append(resp.Answer, &dns.AAAA{
@ -795,14 +801,7 @@ func (d *DNSServer) doDispatch(network string, remoteAddr net.Addr, req, resp *d
})
}
}
// early return without error
return
INVALID:
d.logger.Warn("QName invalid", "qname", qName)
d.addSOA(cfg, resp)
resp.SetRcode(req, dns.RcodeNameError)
return
return true
}
func (d *DNSServer) trimDomain(query string) string {