it compiles + more tweaks
This commit is contained in:
Miek Gieben
parent
c7dbb1edc2
commit
064bfe4f2e
441
server.go
441
server.go
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@ -7,46 +7,48 @@
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package dns
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package dns
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import (
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import (
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// "io"
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"io"
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"os"
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"os"
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"net"
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"net"
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)
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)
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type Handler interface {
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type Handler interface {
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ServeDNS(w ResponseWriter, r *Msg)
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ServeDNS(w ResponseWriter, r *Msg)
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}
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}
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// TODO(mg): fit axfr responses in here too
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// TODO(mg): fit axfr responses in here too
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// A ResponseWriter interface is used by an DNS handler to
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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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// construct an DNS response.
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type ResponseWriter interface {
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type ResponseWriter interface {
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// RemoteAddr returns the address of the client that sent the current request
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// RemoteAddr returns the address of the client that sent the current request
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RemoteAddr() string
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RemoteAddr() string
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Write([]byte) (int, os.Error)
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Write([]byte) (int, os.Error)
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// IP based ACL mapping. The contains the string representation
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// IP based ACL mapping. The contains the string representation
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// of the IP address and a boolean saying it may connect (true) or not.
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// of the IP address and a boolean saying it may connect (true) or not.
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Acl() map[string]bool
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Acl() map[string]bool
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// Tsig secrets. Its a mapping of key names to secrets.
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// Tsig secrets. Its a mapping of key names to secrets.
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Tsig() map[string]string
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Tsig() map[string]string
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}
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}
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type conn struct {
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type conn struct {
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remoteAddr net.Addr // address of remote side (sans port)
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remoteAddr net.Addr // address of remote side (sans port)
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port int // port of the remote side
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port int // port of the remote side, needed TODO(mg)
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handler Handler // request handler
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handler Handler // request handler
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request []byte // bytes read
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request []byte // bytes read
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_UDP *net.UDPConn // i/o connection if UDP was used
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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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_TCP *net.TCPConn // i/o connection if TCP was used
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hijacked bool // connection has been hijacked by hander TODO(mg)
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hijacked bool // connection has been hijacked by hander TODO(mg)
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tsig map[string]string // tsig secrets
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acl map[string]bool // ip acl list
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}
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}
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type response struct {
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type response struct {
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conn *conn
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conn *conn
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req *Msg
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req *Msg
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xfr bool // {i/a}xfr was requested
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xfr bool // {i/a}xfr was requested
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}
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}
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// ServeMux is an DNS request multiplexer. It matches the
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// ServeMux is an DNS request multiplexer. It matches the
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@ -54,7 +56,7 @@ type response struct {
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// registered patterns add calls the handler for the pattern
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// registered patterns add calls the handler for the pattern
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// that most closely matches the zone name.
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// that most closely matches the zone name.
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type ServeMux struct {
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type ServeMux struct {
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m map[string]Handler
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m map[string]Handler
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}
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}
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// NewServeMux allocates and returns a new ServeMux.
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// NewServeMux allocates and returns a new ServeMux.
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@ -71,7 +73,7 @@ type HandlerFunc func(ResponseWriter, *Msg)
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// ServerDNS calls f(w, reg)
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// ServerDNS calls f(w, reg)
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func (f HandlerFunc) ServeDNS(w ResponseWriter, r *Msg) {
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func (f HandlerFunc) ServeDNS(w ResponseWriter, r *Msg) {
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f(w, r)
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f(w, r)
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}
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}
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// Helper handlers
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// Helper handlers
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@ -100,8 +102,8 @@ func HandleUDP(l *net.UDPConn, f func(*Conn, *Msg)) os.Error {
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m = m[:n]
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m = m[:n]
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d := new(Conn)
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d := new(Conn)
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// Use the remote addr as we got from ReadFromUDP
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// Use the remote addr as we got from ReadFromUDP
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d.SetUDPConn(l, addr)
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d.SetUDPConn(l, addr)
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msg := new(Msg)
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msg := new(Msg)
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if !msg.Unpack(m) {
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if !msg.Unpack(m) {
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@ -123,7 +125,7 @@ func HandleTCP(l *net.TCPListener, f func(*Conn, *Msg)) os.Error {
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return e
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return e
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}
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}
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d := new(Conn)
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d := new(Conn)
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d.SetTCPConn(c, nil)
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d.SetTCPConn(c, nil)
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msg := new(Msg)
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msg := new(Msg)
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err := d.ReadMsg(msg)
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err := d.ReadMsg(msg)
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@ -138,53 +140,53 @@ func HandleTCP(l *net.TCPListener, f func(*Conn, *Msg)) os.Error {
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}
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}
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func ListenAndServe(addr string, network string, handler Handler) os.Error {
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func ListenAndServe(addr string, network string, handler Handler) os.Error {
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server := &Server{Addr: addr, Network: network, Handler: handler}
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server := &Server{Addr: addr, Network: network, Handler: handler}
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return server.ListenAndServe()
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return server.ListenAndServe()
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}
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}
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func zoneMatch(pattern, zone string) bool {
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func zoneMatch(pattern, zone string) bool {
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if len(pattern) == 0 {
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if len(pattern) == 0 {
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return false
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return false
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}
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}
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n := len(pattern)
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n := len(pattern)
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return zone[:n] == pattern
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return zone[:n] == pattern
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}
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}
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func (mux *ServeMux) match(zone string) Handler {
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func (mux *ServeMux) match(zone string) Handler {
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var h Handler
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var h Handler
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var n = 0
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var n = 0
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for k, v := range mux.m {
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for k, v := range mux.m {
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if !zoneMatch(k, zone) {
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if !zoneMatch(k, zone) {
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continue
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continue
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}
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}
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if h == nil || len(k) > n {
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if h == nil || len(k) > n {
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n = len(k)
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n = len(k)
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h = v
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h = v
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}
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}
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}
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}
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return h
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return h
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}
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}
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func (mux *ServeMux) Handle(pattern string, handler Handler) {
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func (mux *ServeMux) Handle(pattern string, handler Handler) {
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if pattern == "" {
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if pattern == "" {
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panic("dns: invalid pattern " + pattern)
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panic("dns: invalid pattern " + pattern)
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}
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}
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mux.m[pattern] = handler
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mux.m[pattern] = handler
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}
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}
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func (mux *ServeMux) HandleFunc(pattern string, handler func(ResponseWriter, *Msg)) {
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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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mux.Handle(pattern, HandlerFunc(handler))
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}
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}
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// ServeDNS dispatches the request to the handler whose
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// ServeDNS dispatches the request to the handler whose
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// pattern most closely matches the request message.
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// pattern most closely matches the request message.
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func (mux *ServeMux) ServeDNS(w ResponseWriter, request *Msg) {
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func (mux *ServeMux) ServeDNS(w ResponseWriter, request *Msg) {
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h := mux.match(request.Question[0].Name)
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h := mux.match(request.Question[0].Name)
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if h == nil {
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if h == nil {
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// h = NotFoundHandler()
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// h = NotFoundHandler()
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}
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}
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h.ServeDNS(w, request)
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h.ServeDNS(w, request)
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}
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}
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// Handle register the handler the given pattern
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// Handle register the handler the given pattern
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@ -193,7 +195,7 @@ func (mux *ServeMux) ServeDNS(w ResponseWriter, request *Msg) {
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func Handle(pattern string, handler Handler) { DefaultServeMux.Handle(pattern, handler) }
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func Handle(pattern string, handler Handler) { DefaultServeMux.Handle(pattern, handler) }
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func HandleFunc(pattern string, handler func(ResponseWriter, *Msg)) {
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func HandleFunc(pattern string, handler func(ResponseWriter, *Msg)) {
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DefaultServeMux.HandleFunc(pattern, handler)
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DefaultServeMux.HandleFunc(pattern, handler)
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}
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}
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// Serve accepts incoming DNS request on the TCP listener l,
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// Serve accepts incoming DNS request on the TCP listener l,
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@ -201,8 +203,8 @@ func HandleFunc(pattern string, handler func(ResponseWriter, *Msg)) {
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// read requests and then call handler to reply to them.
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// read requests and then call handler to reply to them.
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// Handler is typically nil, in which case the DefaultServeMux is used.
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// Handler is typically nil, in which case the DefaultServeMux is used.
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func ServeTCP(l *net.TCPListener, handler Handler) os.Error {
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func ServeTCP(l *net.TCPListener, handler Handler) os.Error {
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srv := &Server{Handler: handler, Network: "tcp"}
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srv := &Server{Handler: handler, Network: "tcp"}
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return srv.ServeTCP(l)
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return srv.ServeTCP(l)
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}
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}
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// Serve accepts incoming DNS request on the UDP Conn l,
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// Serve accepts incoming DNS request on the UDP Conn l,
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@ -210,171 +212,222 @@ func ServeTCP(l *net.TCPListener, handler Handler) os.Error {
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// read requests and then call handler to reply to them.
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// read requests and then call handler to reply to them.
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// Handler is typically nil, in which case the DefaultServeMux is used.
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// Handler is typically nil, in which case the DefaultServeMux is used.
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func ServeUDP(l *net.UDPConn, handler Handler) os.Error {
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func ServeUDP(l *net.UDPConn, handler Handler) os.Error {
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srv := &Server{Handler: handler, Network: "udp"}
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srv := &Server{Handler: handler, Network: "udp"}
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return srv.ServeUDP(l)
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return srv.ServeUDP(l)
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}
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}
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// A Server defines parameters for running an HTTP server.
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// A Server defines parameters for running an HTTP server.
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type Server struct {
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type Server struct {
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Addr string // address to listen on, ":dns" if empty
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Addr string // address to listen on, ":dns" if empty
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Network string // If "tcp" it will invoke a TCP listener, otherwise an UDP one
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Network string // If "tcp" it will invoke a TCP listener, otherwise an UDP one
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Handler Handler // handler to invoke, http.DefaultServeMux if nil
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Handler Handler // handler to invoke, http.DefaultServeMux if nil
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ReadTimeout int64 // the net.Conn.SetReadTimeout value for new connections
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ReadTimeout int64 // the net.Conn.SetReadTimeout value for new connections
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WriteTimeout int64 // the net.Conn.SetWriteTimeout value for new connections
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WriteTimeout int64 // the net.Conn.SetWriteTimeout value for new connections
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}
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}
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// Fixes for udp/tcp
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// Fixes for udp/tcp
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func (srv *Server) ListenAndServe() os.Error {
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func (srv *Server) ListenAndServe() os.Error {
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addr := srv.Addr
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addr := srv.Addr
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if addr == "" {
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if addr == "" {
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addr = ":domain"
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addr = ":domain"
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}
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}
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switch srv.Network {
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switch srv.Network {
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case "tcp":
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case "tcp":
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a, e := net.ResolveTCPAddr(addr)
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a, e := net.ResolveTCPAddr(addr)
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if e != nil {
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if e != nil {
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return e
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return e
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}
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}
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l, e := net.ListenTCP("tcp", a)
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l, e := net.ListenTCP("tcp", a)
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if e != nil {
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if e != nil {
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return e
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return e
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}
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}
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return srv.ServeTCP(l)
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return srv.ServeTCP(l)
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case "udp":
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case "udp":
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a, e := net.ResolveUDPAddr(addr)
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a, e := net.ResolveUDPAddr(addr)
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if e != nil {
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if e != nil {
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return e
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return e
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}
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}
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l, e := net.ListenUDP("udp", a)
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l, e := net.ListenUDP("udp", a)
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if e != nil {
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if e != nil {
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return e
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return e
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}
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}
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return srv.ServeUDP(l)
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return srv.ServeUDP(l)
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}
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}
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return nil // os.Error with wrong network
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return nil // os.Error with wrong network
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}
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}
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func (srv *Server) ServeTCP(l *net.TCPListener) os.Error {
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func (srv *Server) ServeTCP(l *net.TCPListener) os.Error {
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defer l.Close()
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defer l.Close()
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handler := srv.Handler
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handler := srv.Handler
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if handler == nil {
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if handler == nil {
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handler = DefaultServeMux
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handler = DefaultServeMux
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}
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}
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forever:
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forever:
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for {
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for {
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rw, e := l.AcceptTCP()
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rw, e := l.AcceptTCP()
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if e != nil {
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if e != nil {
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return e
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return e
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}
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}
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if srv.ReadTimeout != 0 {
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if srv.ReadTimeout != 0 {
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rw.SetReadTimeout(srv.ReadTimeout)
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rw.SetReadTimeout(srv.ReadTimeout)
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}
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}
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if srv.WriteTimeout != 0 {
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if srv.WriteTimeout != 0 {
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rw.SetWriteTimeout(srv.WriteTimeout)
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rw.SetWriteTimeout(srv.WriteTimeout)
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}
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}
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l := make([]byte, 2)
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l := make([]byte, 2)
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n, err := rw.Read(l)
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n, err := rw.Read(l)
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if err != nil || n != 2 {
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if err != nil || n != 2 {
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continue
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continue
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}
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}
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length, _ := unpackUint16(l, 0)
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length, _ := unpackUint16(l, 0)
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if length == 0 {
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if length == 0 {
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continue
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continue
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}
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}
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m := make([]byte, int(length))
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m := make([]byte, int(length))
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n, err = rw.Read(m[:int(length)])
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n, err = rw.Read(m[:int(length)])
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if err != nil {
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if err != nil {
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continue
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continue
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}
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}
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i := n
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i := n
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for i < int(length) {
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for i < int(length) {
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j, err := rw.Read(m[i:int(length)])
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j, err := rw.Read(m[i:int(length)])
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if err != nil {
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if err != nil {
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continue forever
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continue forever
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}
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}
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i += j
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i += j
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}
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}
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n = i
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n = i
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d, err := newConn(rw, nil, rw.RemoteAddr(), m, handler)
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d, err := newConn(rw, nil, rw.RemoteAddr(), m, handler)
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if err != nil {
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if err != nil {
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continue
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continue
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}
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}
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go d.serve()
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go d.serve()
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}
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}
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panic("not reached")
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panic("not reached")
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}
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}
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func (srv *Server) ServeUDP(l *net.UDPConn) os.Error {
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func (srv *Server) ServeUDP(l *net.UDPConn) os.Error {
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defer l.Close()
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defer l.Close()
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handler := srv.Handler
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handler := srv.Handler
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if handler == nil {
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if handler == nil {
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handler = DefaultServeMux
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handler = DefaultServeMux
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}
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}
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for {
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for {
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m := make([]byte, DefaultMsgSize)
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m := make([]byte, DefaultMsgSize)
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n, a, e := l.ReadFromUDP(m)
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n, a, e := l.ReadFromUDP(m)
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if e != nil {
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if e != nil {
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return e
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return e
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}
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}
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m = m[:n]
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m = m[:n]
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if srv.ReadTimeout != 0 {
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if srv.ReadTimeout != 0 {
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l.SetReadTimeout(srv.ReadTimeout)
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l.SetReadTimeout(srv.ReadTimeout)
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}
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}
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if srv.WriteTimeout != 0 {
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if srv.WriteTimeout != 0 {
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l.SetWriteTimeout(srv.WriteTimeout)
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l.SetWriteTimeout(srv.WriteTimeout)
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}
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}
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d, err := newConn(nil, l, a, m, handler)
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d, err := newConn(nil, l, a, m, handler)
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if err != nil {
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if err != nil {
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continue
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continue
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}
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}
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go d.serve()
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go d.serve()
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}
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}
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panic("not reached")
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panic("not reached")
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}
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}
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func newConn(t *net.TCPConn, u *net.UDPConn, a net.Addr, buf []byte, handler Handler) (c *conn, err os.Error) {
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func newConn(t *net.TCPConn, u *net.UDPConn, a net.Addr, buf []byte, handler Handler) (c *conn, err os.Error) {
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c = new(conn)
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c = new(conn)
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c.handler = handler
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c.handler = handler
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c._TCP = t
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c._TCP = t
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c._UDP = u
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c._UDP = u
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c.remoteAddr = a
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c.remoteAddr = a
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c.request = buf
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c.request = buf
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if t != nil {
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if t != nil {
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c.port = a.(*net.TCPAddr).Port
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c.port = a.(*net.TCPAddr).Port
|
||||||
}
|
}
|
||||||
if u != nil {
|
if u != nil {
|
||||||
c.port = a.(*net.UDPAddr).Port
|
c.port = a.(*net.UDPAddr).Port
|
||||||
}
|
}
|
||||||
return c, err
|
return c, err
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
// Close the connection.
|
// Close the connection.
|
||||||
func (c *conn) close() {
|
func (c *conn) close() {
|
||||||
switch {
|
switch {
|
||||||
case c._UDP != nil:
|
case c._UDP != nil:
|
||||||
c._UDP.Close()
|
c._UDP.Close()
|
||||||
c._UDP = nil
|
c._UDP = nil
|
||||||
case c._TCP != nil:
|
case c._TCP != nil:
|
||||||
c._TCP.Close()
|
c._TCP.Close()
|
||||||
c._TCP = nil
|
c._TCP = nil
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
// Serve a new connection.
|
// Serve a new connection.
|
||||||
func (c *conn) serve() {
|
func (c *conn) serve() {
|
||||||
// c.ReadRequest
|
// Request has been read in ServeUDP or ServeTCP
|
||||||
|
w := new(response)
|
||||||
// c.Handler.ServeDNS(w, w.req) // this does the writing
|
w.conn = c
|
||||||
|
w.xfr = false
|
||||||
|
req := new(Msg)
|
||||||
|
if !req.Unpack(c.request) {
|
||||||
|
return
|
||||||
|
}
|
||||||
|
c.handler.ServeDNS(w, w.req) // this does the writing back to the client
|
||||||
|
if c.hijacked {
|
||||||
|
return
|
||||||
|
}
|
||||||
|
c.close()
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
func (c *conn) readRequest() (w *response, err os.Error) {
|
func (w *response) Write(data []byte) (n int, err os.Error) {
|
||||||
|
switch {
|
||||||
|
case w.conn._UDP != nil:
|
||||||
|
n, err = w.conn._UDP.WriteTo(data, w.conn.remoteAddr)
|
||||||
|
if err != nil {
|
||||||
w = new(response)
|
return 0, err
|
||||||
return w, nil
|
}
|
||||||
|
case w.conn._TCP != nil:
|
||||||
|
// TODO(mg) len(data) > 64K
|
||||||
|
l := make([]byte, 2)
|
||||||
|
l[0], l[1] = packUint16(uint16(len(data)))
|
||||||
|
n, err = w.conn._TCP.Write(data)
|
||||||
|
if err != nil {
|
||||||
|
return n, err
|
||||||
|
}
|
||||||
|
if n != 2 {
|
||||||
|
return n, io.ErrShortWrite
|
||||||
|
}
|
||||||
|
n, err = w.conn._TCP.Write(data)
|
||||||
|
if err != nil {
|
||||||
|
return n, err
|
||||||
|
}
|
||||||
|
i := n
|
||||||
|
if i < len(data) {
|
||||||
|
j, err := w.conn._TCP.Write(data[i:len(data)])
|
||||||
|
if err != nil {
|
||||||
|
return i, err
|
||||||
|
}
|
||||||
|
i += j
|
||||||
|
}
|
||||||
|
n = i
|
||||||
|
}
|
||||||
|
return n, nil
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// Acl implements the ResponseWriter.Acl
|
||||||
|
func (w *response) Acl() map[string]bool {
|
||||||
|
return w.conn.acl
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
// Tsig implements the ResponseWriter.Tsig
|
||||||
|
func (w *response) Tsig() map[string]string {
|
||||||
|
return w.conn.tsig
|
||||||
|
}
|
||||||
|
|
||||||
|
// RemoteAddr implements the ResponseWriter.RemoteAddr method
|
||||||
|
func (w *response) RemoteAddr() string { return w.conn.remoteAddr.String() }
|
||||||
|
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue