Move ServeMux into seperate file (#753)
This reduces the clutter in server.go.
This commit is contained in:
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ab16005053
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60d113313c
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@ -0,0 +1,118 @@
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package dns
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import "sync"
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// ServeMux is an DNS request multiplexer. It matches the
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// zone name of each incoming request against a list of
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// registered patterns add calls the handler for the pattern
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// that most closely matches the zone name. ServeMux is DNSSEC aware, meaning
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// that queries for the DS record are redirected to the parent zone (if that
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// is also registered), otherwise the child gets the query.
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// ServeMux is also safe for concurrent access from multiple goroutines.
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type ServeMux struct {
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z map[string]Handler
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m *sync.RWMutex
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}
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// NewServeMux allocates and returns a new ServeMux.
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func NewServeMux() *ServeMux {
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return &ServeMux{z: make(map[string]Handler), m: new(sync.RWMutex)}
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}
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// DefaultServeMux is the default ServeMux used by Serve.
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var DefaultServeMux = NewServeMux()
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func (mux *ServeMux) match(q string, t uint16) Handler {
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mux.m.RLock()
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defer mux.m.RUnlock()
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var handler Handler
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b := make([]byte, len(q)) // worst case, one label of length q
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off := 0
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end := false
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for {
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l := len(q[off:])
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for i := 0; i < l; i++ {
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b[i] = q[off+i]
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if b[i] >= 'A' && b[i] <= 'Z' {
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b[i] |= 'a' - 'A'
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}
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}
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if h, ok := mux.z[string(b[:l])]; ok { // causes garbage, might want to change the map key
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if t != TypeDS {
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return h
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}
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// Continue for DS to see if we have a parent too, if so delegeate to the parent
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handler = h
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}
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off, end = NextLabel(q, off)
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if end {
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break
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}
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}
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// Wildcard match, if we have found nothing try the root zone as a last resort.
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if h, ok := mux.z["."]; ok {
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return h
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}
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return handler
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}
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// Handle adds a handler to the ServeMux for pattern.
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func (mux *ServeMux) Handle(pattern string, handler Handler) {
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if pattern == "" {
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panic("dns: invalid pattern " + pattern)
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}
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mux.m.Lock()
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mux.z[Fqdn(pattern)] = handler
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mux.m.Unlock()
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}
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// HandleFunc adds a handler function to the ServeMux for pattern.
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func (mux *ServeMux) HandleFunc(pattern string, handler func(ResponseWriter, *Msg)) {
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mux.Handle(pattern, HandlerFunc(handler))
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}
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// HandleRemove deregistrars the handler specific for pattern from the ServeMux.
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func (mux *ServeMux) HandleRemove(pattern string) {
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if pattern == "" {
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panic("dns: invalid pattern " + pattern)
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}
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mux.m.Lock()
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delete(mux.z, Fqdn(pattern))
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mux.m.Unlock()
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}
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func failedHandler() Handler { return HandlerFunc(HandleFailed) }
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// ServeDNS dispatches the request to the handler whose
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// pattern most closely matches the request message. If DefaultServeMux
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// is used the correct thing for DS queries is done: a possible parent
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// is sought.
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// If no handler is found a standard SERVFAIL message is returned
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// If the request message does not have exactly one question in the
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// question section a SERVFAIL is returned, unlesss Unsafe is true.
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func (mux *ServeMux) ServeDNS(w ResponseWriter, request *Msg) {
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var h Handler
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if len(request.Question) < 1 { // allow more than one question
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h = failedHandler()
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} else {
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if h = mux.match(request.Question[0].Name, request.Question[0].Qtype); h == nil {
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h = failedHandler()
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}
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}
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h.ServeDNS(w, request)
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}
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// Handle registers the handler with the given pattern
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// in the DefaultServeMux. The documentation for
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// ServeMux explains how patterns are matched.
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func Handle(pattern string, handler Handler) { DefaultServeMux.Handle(pattern, handler) }
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// HandleRemove deregisters the handle with the given pattern
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// in the DefaultServeMux.
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func HandleRemove(pattern string) { DefaultServeMux.HandleRemove(pattern) }
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// HandleFunc registers the handler function with the given pattern
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// in the DefaultServeMux.
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func HandleFunc(pattern string, handler func(ResponseWriter, *Msg)) {
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DefaultServeMux.HandleFunc(pattern, handler)
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}
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@ -0,0 +1,54 @@
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package dns
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import "testing"
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func TestDotAsCatchAllWildcard(t *testing.T) {
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mux := NewServeMux()
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mux.Handle(".", HandlerFunc(HelloServer))
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mux.Handle("example.com.", HandlerFunc(AnotherHelloServer))
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handler := mux.match("www.miek.nl.", TypeTXT)
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if handler == nil {
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t.Error("wildcard match failed")
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}
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handler = mux.match("www.example.com.", TypeTXT)
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if handler == nil {
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t.Error("example.com match failed")
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}
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handler = mux.match("a.www.example.com.", TypeTXT)
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if handler == nil {
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t.Error("a.www.example.com match failed")
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}
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handler = mux.match("boe.", TypeTXT)
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if handler == nil {
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t.Error("boe. match failed")
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}
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}
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func TestCaseFolding(t *testing.T) {
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mux := NewServeMux()
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mux.Handle("_udp.example.com.", HandlerFunc(HelloServer))
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handler := mux.match("_dns._udp.example.com.", TypeSRV)
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if handler == nil {
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t.Error("case sensitive characters folded")
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}
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handler = mux.match("_DNS._UDP.EXAMPLE.COM.", TypeSRV)
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if handler == nil {
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t.Error("case insensitive characters not folded")
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}
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}
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func TestRootServer(t *testing.T) {
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mux := NewServeMux()
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mux.Handle(".", HandlerFunc(HelloServer))
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handler := mux.match(".", TypeNS)
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if handler == nil {
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t.Error("root match failed")
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}
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}
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135
server.go
135
server.go
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@ -41,6 +41,17 @@ type Handler interface {
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ServeDNS(w ResponseWriter, r *Msg)
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}
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// The HandlerFunc type is an adapter to allow the use of
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// ordinary functions as DNS handlers. If f is a function
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// with the appropriate signature, HandlerFunc(f) is a
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// Handler object that calls f.
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type HandlerFunc func(ResponseWriter, *Msg)
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// ServeDNS calls f(w, r).
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func (f HandlerFunc) ServeDNS(w ResponseWriter, r *Msg) {
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f(w, r)
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}
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// A ResponseWriter interface is used by an DNS handler to
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// construct an DNS response.
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type ResponseWriter interface {
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@ -83,35 +94,6 @@ type response struct {
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wg *sync.WaitGroup // for gracefull shutdown
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}
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// ServeMux is an DNS request multiplexer. It matches the
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// zone name of each incoming request against a list of
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// registered patterns add calls the handler for the pattern
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// that most closely matches the zone name. ServeMux is DNSSEC aware, meaning
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// that queries for the DS record are redirected to the parent zone (if that
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// is also registered), otherwise the child gets the query.
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// ServeMux is also safe for concurrent access from multiple goroutines.
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type ServeMux struct {
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z map[string]Handler
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m *sync.RWMutex
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}
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// NewServeMux allocates and returns a new ServeMux.
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func NewServeMux() *ServeMux { return &ServeMux{z: make(map[string]Handler), m: new(sync.RWMutex)} }
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// DefaultServeMux is the default ServeMux used by Serve.
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var DefaultServeMux = NewServeMux()
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// The HandlerFunc type is an adapter to allow the use of
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// ordinary functions as DNS handlers. If f is a function
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// with the appropriate signature, HandlerFunc(f) is a
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// Handler object that calls f.
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type HandlerFunc func(ResponseWriter, *Msg)
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// ServeDNS calls f(w, r).
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func (f HandlerFunc) ServeDNS(w ResponseWriter, r *Msg) {
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f(w, r)
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}
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// HandleFailed returns a HandlerFunc that returns SERVFAIL for every request it gets.
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func HandleFailed(w ResponseWriter, r *Msg) {
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m := new(Msg)
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@ -120,8 +102,6 @@ func HandleFailed(w ResponseWriter, r *Msg) {
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w.WriteMsg(m)
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}
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func failedHandler() Handler { return HandlerFunc(HandleFailed) }
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// ListenAndServe Starts a server on address and network specified Invoke handler
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// for incoming queries.
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func ListenAndServe(addr string, network string, handler Handler) error {
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@ -160,99 +140,6 @@ func ActivateAndServe(l net.Listener, p net.PacketConn, handler Handler) error {
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return server.ActivateAndServe()
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}
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func (mux *ServeMux) match(q string, t uint16) Handler {
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mux.m.RLock()
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defer mux.m.RUnlock()
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var handler Handler
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b := make([]byte, len(q)) // worst case, one label of length q
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off := 0
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end := false
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for {
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l := len(q[off:])
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for i := 0; i < l; i++ {
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b[i] = q[off+i]
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if b[i] >= 'A' && b[i] <= 'Z' {
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b[i] |= 'a' - 'A'
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}
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}
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if h, ok := mux.z[string(b[:l])]; ok { // causes garbage, might want to change the map key
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if t != TypeDS {
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return h
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}
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// Continue for DS to see if we have a parent too, if so delegeate to the parent
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handler = h
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}
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off, end = NextLabel(q, off)
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if end {
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break
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}
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}
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// Wildcard match, if we have found nothing try the root zone as a last resort.
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if h, ok := mux.z["."]; ok {
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return h
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}
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return handler
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}
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// Handle adds a handler to the ServeMux for pattern.
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func (mux *ServeMux) Handle(pattern string, handler Handler) {
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if pattern == "" {
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panic("dns: invalid pattern " + pattern)
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}
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mux.m.Lock()
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mux.z[Fqdn(pattern)] = handler
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mux.m.Unlock()
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}
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// HandleFunc adds a handler function to the ServeMux for pattern.
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func (mux *ServeMux) HandleFunc(pattern string, handler func(ResponseWriter, *Msg)) {
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mux.Handle(pattern, HandlerFunc(handler))
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}
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// HandleRemove deregistrars the handler specific for pattern from the ServeMux.
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func (mux *ServeMux) HandleRemove(pattern string) {
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if pattern == "" {
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panic("dns: invalid pattern " + pattern)
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}
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mux.m.Lock()
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delete(mux.z, Fqdn(pattern))
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mux.m.Unlock()
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}
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// ServeDNS dispatches the request to the handler whose
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// pattern most closely matches the request message. If DefaultServeMux
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// is used the correct thing for DS queries is done: a possible parent
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// is sought.
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// If no handler is found a standard SERVFAIL message is returned
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// If the request message does not have exactly one question in the
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// question section a SERVFAIL is returned, unlesss Unsafe is true.
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func (mux *ServeMux) ServeDNS(w ResponseWriter, request *Msg) {
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var h Handler
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if len(request.Question) < 1 { // allow more than one question
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h = failedHandler()
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} else {
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if h = mux.match(request.Question[0].Name, request.Question[0].Qtype); h == nil {
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h = failedHandler()
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}
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}
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h.ServeDNS(w, request)
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}
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// Handle registers the handler with the given pattern
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// in the DefaultServeMux. The documentation for
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// ServeMux explains how patterns are matched.
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func Handle(pattern string, handler Handler) { DefaultServeMux.Handle(pattern, handler) }
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// HandleRemove deregisters the handle with the given pattern
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// in the DefaultServeMux.
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func HandleRemove(pattern string) { DefaultServeMux.HandleRemove(pattern) }
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// HandleFunc registers the handler function with the given pattern
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// in the DefaultServeMux.
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func HandleFunc(pattern string, handler func(ResponseWriter, *Msg)) {
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DefaultServeMux.HandleFunc(pattern, handler)
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}
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// Writer writes raw DNS messages; each call to Write should send an entire message.
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type Writer interface {
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io.Writer
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@ -510,57 +510,6 @@ func BenchmarkServeCompress(b *testing.B) {
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runtime.GOMAXPROCS(a)
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}
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func TestDotAsCatchAllWildcard(t *testing.T) {
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mux := NewServeMux()
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mux.Handle(".", HandlerFunc(HelloServer))
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mux.Handle("example.com.", HandlerFunc(AnotherHelloServer))
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handler := mux.match("www.miek.nl.", TypeTXT)
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if handler == nil {
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t.Error("wildcard match failed")
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}
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handler = mux.match("www.example.com.", TypeTXT)
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if handler == nil {
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t.Error("example.com match failed")
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}
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handler = mux.match("a.www.example.com.", TypeTXT)
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if handler == nil {
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t.Error("a.www.example.com match failed")
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}
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handler = mux.match("boe.", TypeTXT)
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if handler == nil {
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t.Error("boe. match failed")
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}
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}
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func TestCaseFolding(t *testing.T) {
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mux := NewServeMux()
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mux.Handle("_udp.example.com.", HandlerFunc(HelloServer))
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handler := mux.match("_dns._udp.example.com.", TypeSRV)
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if handler == nil {
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t.Error("case sensitive characters folded")
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}
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handler = mux.match("_DNS._UDP.EXAMPLE.COM.", TypeSRV)
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if handler == nil {
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t.Error("case insensitive characters not folded")
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}
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}
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func TestRootServer(t *testing.T) {
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mux := NewServeMux()
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mux.Handle(".", HandlerFunc(HelloServer))
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handler := mux.match(".", TypeNS)
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if handler == nil {
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t.Error("root match failed")
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}
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}
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type maxRec struct {
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max int
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sync.RWMutex
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