Move deps from _workspace/ to vendor/
godep restore pushd $GOPATH/src/github.com/appc/spec git co master popd go get go4.org/errorutil rm -rf Godeps godep save ./... git add vendor git add -f $(git ls-files --other vendor/) git co -- Godeps/LICENSES Godeps/.license_file_state Godeps/OWNERS
This commit is contained in:
Tim Hockin
626
vendor/github.com/miekg/dns/server.go
generated
vendored
Normal file
626
vendor/github.com/miekg/dns/server.go
generated
vendored
Normal file
@@ -0,0 +1,626 @@
|
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// DNS server implementation.
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package dns
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import (
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"bytes"
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"io"
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"net"
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"sync"
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"time"
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)
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type Handler interface {
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ServeDNS(w ResponseWriter, r *Msg)
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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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// LocalAddr returns the net.Addr of the server
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LocalAddr() net.Addr
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// RemoteAddr returns the net.Addr of the client that sent the current request.
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RemoteAddr() net.Addr
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// WriteMsg writes a reply back to the client.
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WriteMsg(*Msg) error
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// Write writes a raw buffer back to the client.
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Write([]byte) (int, error)
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// Close closes the connection.
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Close() error
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// TsigStatus returns the status of the Tsig.
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TsigStatus() error
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// TsigTimersOnly sets the tsig timers only boolean.
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TsigTimersOnly(bool)
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// Hijack lets the caller take over the connection.
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// After a call to Hijack(), the DNS package will not do anything with the connection.
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Hijack()
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}
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type response struct {
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hijacked bool // connection has been hijacked by handler
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tsigStatus error
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tsigTimersOnly bool
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tsigRequestMAC string
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tsigSecret map[string]string // the tsig secrets
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udp *net.UDPConn // i/o connection if UDP was used
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tcp *net.TCPConn // i/o connection if TCP was used
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udpSession *sessionUDP // oob data to get egress interface right
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remoteAddr net.Addr // address of the client
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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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// ServerDNS 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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// FailedHandler 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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m.SetRcode(r, RcodeServerFailure)
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// does not matter if this write fails
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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 addresss and network speficied. 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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server := &Server{Addr: addr, Net: network, Handler: handler}
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return server.ListenAndServe()
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}
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// ActivateAndServe activates a server with a listener from systemd,
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// l and p should not both be non-nil.
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// If both l and p are not nil only p will be used.
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// Invoke handler for incoming queries.
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func ActivateAndServe(l net.Listener, p net.PacketConn, handler Handler) error {
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server := &Server{Listener: l, PacketConn: p, Handler: handler}
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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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} else {
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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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}
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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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// Handle adds a handler 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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// don't need a mutex here, because deleting is OK, even if the
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// entry is note there.
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delete(mux.z, Fqdn(pattern))
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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
|
||||
// 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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// A Server defines parameters for running an DNS server.
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type Server struct {
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// Address to listen on, ":dns" if empty.
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Addr string
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// if "tcp" it will invoke a TCP listener, otherwise an UDP one.
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Net string
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// TCP Listener to use, this is to aid in systemd's socket activation.
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Listener net.Listener
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// UDP "Listener" to use, this is to aid in systemd's socket activation.
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PacketConn net.PacketConn
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// Handler to invoke, dns.DefaultServeMux if nil.
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Handler Handler
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// Default buffer size to use to read incoming UDP messages. If not set
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// it defaults to MinMsgSize (512 B).
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UDPSize int
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// The net.Conn.SetReadTimeout value for new connections, defaults to 2 * time.Second.
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ReadTimeout time.Duration
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// The net.Conn.SetWriteTimeout value for new connections, defaults to 2 * time.Second.
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WriteTimeout time.Duration
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// TCP idle timeout for multiple queries, if nil, defaults to 8 * time.Second (RFC 5966).
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IdleTimeout func() time.Duration
|
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// Secret(s) for Tsig map[<zonename>]<base64 secret>.
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TsigSecret map[string]string
|
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// Unsafe instructs the server to disregard any sanity checks and directly hand the message to
|
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// the handler. It will specfically not check if the query has the QR bit not set.
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Unsafe bool
|
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// If NotifyStartedFunc is set is is called, once the server has started listening.
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NotifyStartedFunc func()
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// For graceful shutdown.
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stopUDP chan bool
|
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stopTCP chan bool
|
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wgUDP sync.WaitGroup
|
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wgTCP sync.WaitGroup
|
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|
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// make start/shutdown not racy
|
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lock sync.Mutex
|
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started bool
|
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}
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// ListenAndServe starts a nameserver on the configured address in *Server.
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func (srv *Server) ListenAndServe() error {
|
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srv.lock.Lock()
|
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if srv.started {
|
||||
return &Error{err: "server already started"}
|
||||
}
|
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srv.stopUDP, srv.stopTCP = make(chan bool), make(chan bool)
|
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srv.started = true
|
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srv.lock.Unlock()
|
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addr := srv.Addr
|
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if addr == "" {
|
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addr = ":domain"
|
||||
}
|
||||
if srv.UDPSize == 0 {
|
||||
srv.UDPSize = MinMsgSize
|
||||
}
|
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switch srv.Net {
|
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case "tcp", "tcp4", "tcp6":
|
||||
a, e := net.ResolveTCPAddr(srv.Net, addr)
|
||||
if e != nil {
|
||||
return e
|
||||
}
|
||||
l, e := net.ListenTCP(srv.Net, a)
|
||||
if e != nil {
|
||||
return e
|
||||
}
|
||||
return srv.serveTCP(l)
|
||||
case "udp", "udp4", "udp6":
|
||||
a, e := net.ResolveUDPAddr(srv.Net, addr)
|
||||
if e != nil {
|
||||
return e
|
||||
}
|
||||
l, e := net.ListenUDP(srv.Net, a)
|
||||
if e != nil {
|
||||
return e
|
||||
}
|
||||
if e := setUDPSocketOptions(l); e != nil {
|
||||
return e
|
||||
}
|
||||
return srv.serveUDP(l)
|
||||
}
|
||||
return &Error{err: "bad network"}
|
||||
}
|
||||
|
||||
// ActivateAndServe starts a nameserver with the PacketConn or Listener
|
||||
// configured in *Server. Its main use is to start a server from systemd.
|
||||
func (srv *Server) ActivateAndServe() error {
|
||||
srv.lock.Lock()
|
||||
if srv.started {
|
||||
return &Error{err: "server already started"}
|
||||
}
|
||||
srv.stopUDP, srv.stopTCP = make(chan bool), make(chan bool)
|
||||
srv.started = true
|
||||
srv.lock.Unlock()
|
||||
if srv.PacketConn != nil {
|
||||
if srv.UDPSize == 0 {
|
||||
srv.UDPSize = MinMsgSize
|
||||
}
|
||||
if t, ok := srv.PacketConn.(*net.UDPConn); ok {
|
||||
if e := setUDPSocketOptions(t); e != nil {
|
||||
return e
|
||||
}
|
||||
return srv.serveUDP(t)
|
||||
}
|
||||
}
|
||||
if srv.Listener != nil {
|
||||
if t, ok := srv.Listener.(*net.TCPListener); ok {
|
||||
return srv.serveTCP(t)
|
||||
}
|
||||
}
|
||||
return &Error{err: "bad listeners"}
|
||||
}
|
||||
|
||||
// Shutdown gracefully shuts down a server. After a call to Shutdown, ListenAndServe and
|
||||
// ActivateAndServe will return. All in progress queries are completed before the server
|
||||
// is taken down. If the Shutdown is taking longer than the reading timeout and error
|
||||
// is returned.
|
||||
func (srv *Server) Shutdown() error {
|
||||
srv.lock.Lock()
|
||||
if !srv.started {
|
||||
return &Error{err: "server not started"}
|
||||
}
|
||||
srv.started = false
|
||||
srv.lock.Unlock()
|
||||
net, addr := srv.Net, srv.Addr
|
||||
switch {
|
||||
case srv.Listener != nil:
|
||||
a := srv.Listener.Addr()
|
||||
net, addr = a.Network(), a.String()
|
||||
case srv.PacketConn != nil:
|
||||
a := srv.PacketConn.LocalAddr()
|
||||
net, addr = a.Network(), a.String()
|
||||
}
|
||||
|
||||
fin := make(chan bool)
|
||||
switch net {
|
||||
case "tcp", "tcp4", "tcp6":
|
||||
go func() {
|
||||
srv.stopTCP <- true
|
||||
srv.wgTCP.Wait()
|
||||
fin <- true
|
||||
}()
|
||||
|
||||
case "udp", "udp4", "udp6":
|
||||
go func() {
|
||||
srv.stopUDP <- true
|
||||
srv.wgUDP.Wait()
|
||||
fin <- true
|
||||
}()
|
||||
}
|
||||
|
||||
c := &Client{Net: net}
|
||||
go c.Exchange(new(Msg), addr) // extra query to help ReadXXX loop to pass
|
||||
|
||||
select {
|
||||
case <-time.After(srv.getReadTimeout()):
|
||||
return &Error{err: "server shutdown is pending"}
|
||||
case <-fin:
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// getReadTimeout is a helper func to use system timeout if server did not intend to change it.
|
||||
func (srv *Server) getReadTimeout() time.Duration {
|
||||
rtimeout := dnsTimeout
|
||||
if srv.ReadTimeout != 0 {
|
||||
rtimeout = srv.ReadTimeout
|
||||
}
|
||||
return rtimeout
|
||||
}
|
||||
|
||||
// serveTCP starts a TCP listener for the server.
|
||||
// Each request is handled in a seperate goroutine.
|
||||
func (srv *Server) serveTCP(l *net.TCPListener) error {
|
||||
defer l.Close()
|
||||
|
||||
if srv.NotifyStartedFunc != nil {
|
||||
srv.NotifyStartedFunc()
|
||||
}
|
||||
|
||||
handler := srv.Handler
|
||||
if handler == nil {
|
||||
handler = DefaultServeMux
|
||||
}
|
||||
rtimeout := srv.getReadTimeout()
|
||||
// deadline is not used here
|
||||
for {
|
||||
rw, e := l.AcceptTCP()
|
||||
if e != nil {
|
||||
continue
|
||||
}
|
||||
m, e := srv.readTCP(rw, rtimeout)
|
||||
select {
|
||||
case <-srv.stopTCP:
|
||||
return nil
|
||||
default:
|
||||
}
|
||||
if e != nil {
|
||||
continue
|
||||
}
|
||||
srv.wgTCP.Add(1)
|
||||
go srv.serve(rw.RemoteAddr(), handler, m, nil, nil, rw)
|
||||
}
|
||||
panic("dns: not reached")
|
||||
}
|
||||
|
||||
// serveUDP starts a UDP listener for the server.
|
||||
// Each request is handled in a seperate goroutine.
|
||||
func (srv *Server) serveUDP(l *net.UDPConn) error {
|
||||
defer l.Close()
|
||||
|
||||
if srv.NotifyStartedFunc != nil {
|
||||
srv.NotifyStartedFunc()
|
||||
}
|
||||
|
||||
handler := srv.Handler
|
||||
if handler == nil {
|
||||
handler = DefaultServeMux
|
||||
}
|
||||
rtimeout := srv.getReadTimeout()
|
||||
// deadline is not used here
|
||||
for {
|
||||
m, s, e := srv.readUDP(l, rtimeout)
|
||||
select {
|
||||
case <-srv.stopUDP:
|
||||
return nil
|
||||
default:
|
||||
}
|
||||
if e != nil {
|
||||
continue
|
||||
}
|
||||
srv.wgUDP.Add(1)
|
||||
go srv.serve(s.RemoteAddr(), handler, m, l, s, nil)
|
||||
}
|
||||
panic("dns: not reached")
|
||||
}
|
||||
|
||||
// Serve a new connection.
|
||||
func (srv *Server) serve(a net.Addr, h Handler, m []byte, u *net.UDPConn, s *sessionUDP, t *net.TCPConn) {
|
||||
w := &response{tsigSecret: srv.TsigSecret, udp: u, tcp: t, remoteAddr: a, udpSession: s}
|
||||
q := 0
|
||||
defer func() {
|
||||
if u != nil {
|
||||
srv.wgUDP.Done()
|
||||
}
|
||||
if t != nil {
|
||||
srv.wgTCP.Done()
|
||||
}
|
||||
}()
|
||||
Redo:
|
||||
// Ideally we want use isMsg here before we allocate memory to actually parse the packet.
|
||||
req := new(Msg)
|
||||
err := req.Unpack(m)
|
||||
if err != nil { // Send a FormatError back
|
||||
x := new(Msg)
|
||||
x.SetRcodeFormatError(req)
|
||||
w.WriteMsg(x)
|
||||
goto Exit
|
||||
}
|
||||
if !srv.Unsafe && req.Response {
|
||||
goto Exit
|
||||
}
|
||||
|
||||
w.tsigStatus = nil
|
||||
if w.tsigSecret != nil {
|
||||
if t := req.IsTsig(); t != nil {
|
||||
secret := t.Hdr.Name
|
||||
if _, ok := w.tsigSecret[secret]; !ok {
|
||||
w.tsigStatus = ErrKeyAlg
|
||||
}
|
||||
w.tsigStatus = TsigVerify(m, w.tsigSecret[secret], "", false)
|
||||
w.tsigTimersOnly = false
|
||||
w.tsigRequestMAC = req.Extra[len(req.Extra)-1].(*TSIG).MAC
|
||||
}
|
||||
}
|
||||
h.ServeDNS(w, req) // Writes back to the client
|
||||
|
||||
Exit:
|
||||
if w.hijacked {
|
||||
return // client calls Close()
|
||||
}
|
||||
if u != nil { // UDP, "close" and return
|
||||
w.Close()
|
||||
return
|
||||
}
|
||||
idleTimeout := tcpIdleTimeout
|
||||
if srv.IdleTimeout != nil {
|
||||
idleTimeout = srv.IdleTimeout()
|
||||
}
|
||||
m, e := srv.readTCP(w.tcp, idleTimeout)
|
||||
if e == nil {
|
||||
q++
|
||||
// TODO(miek): make this number configurable?
|
||||
if q > 128 { // close socket after this many queries
|
||||
w.Close()
|
||||
return
|
||||
}
|
||||
goto Redo
|
||||
}
|
||||
w.Close()
|
||||
return
|
||||
}
|
||||
|
||||
func (srv *Server) readTCP(conn *net.TCPConn, timeout time.Duration) ([]byte, error) {
|
||||
conn.SetReadDeadline(time.Now().Add(timeout))
|
||||
l := make([]byte, 2)
|
||||
n, err := conn.Read(l)
|
||||
if err != nil || n != 2 {
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return nil, ErrShortRead
|
||||
}
|
||||
length, _ := unpackUint16(l, 0)
|
||||
if length == 0 {
|
||||
return nil, ErrShortRead
|
||||
}
|
||||
m := make([]byte, int(length))
|
||||
n, err = conn.Read(m[:int(length)])
|
||||
if err != nil || n == 0 {
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return nil, ErrShortRead
|
||||
}
|
||||
i := n
|
||||
for i < int(length) {
|
||||
j, err := conn.Read(m[i:int(length)])
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
i += j
|
||||
}
|
||||
n = i
|
||||
m = m[:n]
|
||||
return m, nil
|
||||
}
|
||||
|
||||
func (srv *Server) readUDP(conn *net.UDPConn, timeout time.Duration) ([]byte, *sessionUDP, error) {
|
||||
conn.SetReadDeadline(time.Now().Add(timeout))
|
||||
m := make([]byte, srv.UDPSize)
|
||||
n, s, e := readFromSessionUDP(conn, m)
|
||||
if e != nil || n == 0 {
|
||||
if e != nil {
|
||||
return nil, nil, e
|
||||
}
|
||||
return nil, nil, ErrShortRead
|
||||
}
|
||||
m = m[:n]
|
||||
return m, s, nil
|
||||
}
|
||||
|
||||
// WriteMsg implements the ResponseWriter.WriteMsg method.
|
||||
func (w *response) WriteMsg(m *Msg) (err error) {
|
||||
var data []byte
|
||||
if w.tsigSecret != nil { // if no secrets, dont check for the tsig (which is a longer check)
|
||||
if t := m.IsTsig(); t != nil {
|
||||
data, w.tsigRequestMAC, err = TsigGenerate(m, w.tsigSecret[t.Hdr.Name], w.tsigRequestMAC, w.tsigTimersOnly)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
_, err = w.Write(data)
|
||||
return err
|
||||
}
|
||||
}
|
||||
data, err = m.Pack()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
_, err = w.Write(data)
|
||||
return err
|
||||
}
|
||||
|
||||
// Write implements the ResponseWriter.Write method.
|
||||
func (w *response) Write(m []byte) (int, error) {
|
||||
switch {
|
||||
case w.udp != nil:
|
||||
n, err := writeToSessionUDP(w.udp, m, w.udpSession)
|
||||
return n, err
|
||||
case w.tcp != nil:
|
||||
lm := len(m)
|
||||
if lm < 2 {
|
||||
return 0, io.ErrShortBuffer
|
||||
}
|
||||
if lm > MaxMsgSize {
|
||||
return 0, &Error{err: "message too large"}
|
||||
}
|
||||
l := make([]byte, 2, 2+lm)
|
||||
l[0], l[1] = packUint16(uint16(lm))
|
||||
m = append(l, m...)
|
||||
|
||||
n, err := io.Copy(w.tcp, bytes.NewReader(m))
|
||||
return int(n), err
|
||||
}
|
||||
panic("not reached")
|
||||
}
|
||||
|
||||
// LocalAddr implements the ResponseWriter.LocalAddr method.
|
||||
func (w *response) LocalAddr() net.Addr {
|
||||
if w.tcp != nil {
|
||||
return w.tcp.LocalAddr()
|
||||
}
|
||||
return w.udp.LocalAddr()
|
||||
}
|
||||
|
||||
// RemoteAddr implements the ResponseWriter.RemoteAddr method.
|
||||
func (w *response) RemoteAddr() net.Addr { return w.remoteAddr }
|
||||
|
||||
// TsigStatus implements the ResponseWriter.TsigStatus method.
|
||||
func (w *response) TsigStatus() error { return w.tsigStatus }
|
||||
|
||||
// TsigTimersOnly implements the ResponseWriter.TsigTimersOnly method.
|
||||
func (w *response) TsigTimersOnly(b bool) { w.tsigTimersOnly = b }
|
||||
|
||||
// Hijack implements the ResponseWriter.Hijack method.
|
||||
func (w *response) Hijack() { w.hijacked = true }
|
||||
|
||||
// Close implements the ResponseWriter.Close method
|
||||
func (w *response) Close() error {
|
||||
// Can't close the udp conn, as that is actually the listener.
|
||||
if w.tcp != nil {
|
||||
e := w.tcp.Close()
|
||||
w.tcp = nil
|
||||
return e
|
||||
}
|
||||
return nil
|
||||
}
|
||||
Reference in New Issue
Block a user