mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-29 15:47:27 +02:00
* use certmagic for more extensible/robust ACME cert handling * accept TOS based on config option Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv>
123 lines
3.4 KiB
Go
Vendored
123 lines
3.4 KiB
Go
Vendored
package dns
|
|
|
|
import (
|
|
"sync"
|
|
)
|
|
|
|
// ServeMux is an DNS request multiplexer. It matches the zone name of
|
|
// each incoming request against a list of registered patterns add calls
|
|
// the handler for the pattern that most closely matches the zone name.
|
|
//
|
|
// ServeMux is DNSSEC aware, meaning that queries for the DS record are
|
|
// redirected to the parent zone (if that is also registered), otherwise
|
|
// the child gets the query.
|
|
//
|
|
// ServeMux is also safe for concurrent access from multiple goroutines.
|
|
//
|
|
// The zero ServeMux is empty and ready for use.
|
|
type ServeMux struct {
|
|
z map[string]Handler
|
|
m sync.RWMutex
|
|
}
|
|
|
|
// NewServeMux allocates and returns a new ServeMux.
|
|
func NewServeMux() *ServeMux {
|
|
return new(ServeMux)
|
|
}
|
|
|
|
// DefaultServeMux is the default ServeMux used by Serve.
|
|
var DefaultServeMux = NewServeMux()
|
|
|
|
func (mux *ServeMux) match(q string, t uint16) Handler {
|
|
mux.m.RLock()
|
|
defer mux.m.RUnlock()
|
|
if mux.z == nil {
|
|
return nil
|
|
}
|
|
|
|
q = CanonicalName(q)
|
|
|
|
var handler Handler
|
|
for off, end := 0, false; !end; off, end = NextLabel(q, off) {
|
|
if h, ok := mux.z[q[off:]]; ok {
|
|
if t != TypeDS {
|
|
return h
|
|
}
|
|
// Continue for DS to see if we have a parent too, if so delegate to the parent
|
|
handler = h
|
|
}
|
|
}
|
|
|
|
// Wildcard match, if we have found nothing try the root zone as a last resort.
|
|
if h, ok := mux.z["."]; ok {
|
|
return h
|
|
}
|
|
|
|
return handler
|
|
}
|
|
|
|
// Handle adds a handler to the ServeMux for pattern.
|
|
func (mux *ServeMux) Handle(pattern string, handler Handler) {
|
|
if pattern == "" {
|
|
panic("dns: invalid pattern " + pattern)
|
|
}
|
|
mux.m.Lock()
|
|
if mux.z == nil {
|
|
mux.z = make(map[string]Handler)
|
|
}
|
|
mux.z[CanonicalName(pattern)] = handler
|
|
mux.m.Unlock()
|
|
}
|
|
|
|
// HandleFunc adds a handler function to the ServeMux for pattern.
|
|
func (mux *ServeMux) HandleFunc(pattern string, handler func(ResponseWriter, *Msg)) {
|
|
mux.Handle(pattern, HandlerFunc(handler))
|
|
}
|
|
|
|
// HandleRemove deregisters the handler specific for pattern from the ServeMux.
|
|
func (mux *ServeMux) HandleRemove(pattern string) {
|
|
if pattern == "" {
|
|
panic("dns: invalid pattern " + pattern)
|
|
}
|
|
mux.m.Lock()
|
|
delete(mux.z, CanonicalName(pattern))
|
|
mux.m.Unlock()
|
|
}
|
|
|
|
// ServeDNS dispatches the request to the handler whose pattern most
|
|
// closely matches the request message.
|
|
//
|
|
// ServeDNS is DNSSEC aware, meaning that queries for the DS record
|
|
// are redirected to the parent zone (if that is also registered),
|
|
// otherwise the child gets the query.
|
|
//
|
|
// If no handler is found, or there is no question, a standard SERVFAIL
|
|
// message is returned
|
|
func (mux *ServeMux) ServeDNS(w ResponseWriter, req *Msg) {
|
|
var h Handler
|
|
if len(req.Question) >= 1 { // allow more than one question
|
|
h = mux.match(req.Question[0].Name, req.Question[0].Qtype)
|
|
}
|
|
|
|
if h != nil {
|
|
h.ServeDNS(w, req)
|
|
} else {
|
|
HandleFailed(w, req)
|
|
}
|
|
}
|
|
|
|
// Handle registers the handler with the given pattern
|
|
// in the DefaultServeMux. The documentation for
|
|
// ServeMux explains how patterns are matched.
|
|
func Handle(pattern string, handler Handler) { DefaultServeMux.Handle(pattern, handler) }
|
|
|
|
// HandleRemove deregisters the handle with the given pattern
|
|
// in the DefaultServeMux.
|
|
func HandleRemove(pattern string) { DefaultServeMux.HandleRemove(pattern) }
|
|
|
|
// HandleFunc registers the handler function with the given pattern
|
|
// in the DefaultServeMux.
|
|
func HandleFunc(pattern string, handler func(ResponseWriter, *Msg)) {
|
|
DefaultServeMux.HandleFunc(pattern, handler)
|
|
}
|