mirror of
https://github.com/golang/go
synced 2024-11-22 02:44:39 -07:00
Add authentication.
Other code fixing: - Fixed bugs in get32. - Fix code for parsing display string (as a new function). - Fix code for connecting to X server. The old code only work if the server is listening to TCP port, otherwise it doesn't work (at least in my PC). R=nigeltao_golang, rsc, jhh CC=golang-dev https://golang.org/cl/183111
This commit is contained in:
Firmansyah Adiputra
Nigel Tao
parent
f43d95fbde
commit
9628d4c6eb
110
src/pkg/xgb/auth.go
Normal file
110
src/pkg/xgb/auth.go
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@ -0,0 +1,110 @@
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package xgb
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import (
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"bufio"
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"io"
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"os"
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)
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func getU16BE(r io.Reader, b []byte) (uint16, os.Error) {
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_, err := io.ReadFull(r, b[0:2])
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if err != nil {
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return 0, err
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}
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return uint16(b[0])<<8 + uint16(b[1]), nil
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}
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func getBytes(r io.Reader, b []byte) ([]byte, os.Error) {
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n, err := getU16BE(r, b)
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if err != nil {
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return nil, err
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}
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if int(n) > len(b) {
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return nil, os.NewError("bytes too long for buffer")
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}
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_, err = io.ReadFull(r, b[0:n])
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if err != nil {
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return nil, err
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}
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return b[0:n], nil
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}
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func getString(r io.Reader, b []byte) (string, os.Error) {
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b, err := getBytes(r, b)
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if err != nil {
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return "", err
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}
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return string(b), nil
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}
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// readAuthority reads the X authority file for the DISPLAY.
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// If hostname == "" or hostname == "localhost",
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// readAuthority uses the system's hostname (as returned by os.Hostname) instead.
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func readAuthority(hostname, display string) (name string, data []byte, err os.Error) {
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// b is a scratch buffer to use and should be at least 256 bytes long
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// (i.e. it should be able to hold a hostname).
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var b [256]byte
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// As per /usr/include/X11/Xauth.h.
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const familyLocal = 256
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if len(hostname) == 0 || hostname == "localhost" {
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hostname, err = os.Hostname()
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if err != nil {
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return "", nil, err
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}
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}
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fname := os.Getenv("XAUTHORITY")
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if len(fname) == 0 {
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home := os.Getenv("HOME")
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if len(home) == 0 {
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err = os.NewError("Xauthority not found: $XAUTHORITY, $HOME not set")
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return "", nil, err
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}
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fname = home + "/.Xauthority"
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}
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r, err := os.Open(fname, os.O_RDONLY, 0444)
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if err != nil {
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return "", nil, err
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}
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defer r.Close()
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br := bufio.NewReader(r)
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for {
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family, err := getU16BE(br, b[0:2])
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if err != nil {
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return "", nil, err
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}
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addr, err := getString(br, b[0:])
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if err != nil {
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return "", nil, err
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}
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disp, err := getString(br, b[0:])
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if err != nil {
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return "", nil, err
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}
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name0, err := getString(br, b[0:])
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if err != nil {
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return "", nil, err
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}
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data0, err := getBytes(br, b[0:])
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if err != nil {
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return "", nil, err
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}
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if family == familyLocal && addr == hostname && disp == display {
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return name0, data0, nil
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}
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}
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panic("unreachable")
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}
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@ -18,12 +18,14 @@ import (
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// A Conn represents a connection to an X server.
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// Only one goroutine should use a Conn's methods at a time.
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type Conn struct {
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host string
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conn net.Conn
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nextId Id
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nextCookie Cookie
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replies map[Cookie][]byte
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events queue
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err os.Error
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display string
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defaultScreen int
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scratch [32]byte
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Setup SetupInfo
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@ -89,7 +91,7 @@ func get32(buf []byte) uint32 {
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v := uint32(buf[0])
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v |= uint32(buf[1]) << 8
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v |= uint32(buf[2]) << 16
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v |= uint32(buf[3]) << 32
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v |= uint32(buf[3]) << 24
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return v
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}
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@ -284,49 +286,39 @@ func (c *Conn) PollForEvent() (Event, os.Error) {
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}
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// Dial connects to the X server given in the 'display' string.
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// The display string is typically taken from os.Getenv("DISPLAY").
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// If 'display' is empty it will be taken from os.Getenv("DISPLAY").
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//
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// Examples:
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// Dial(":1") // connect to net.Dial("unix", "", "/tmp/.X11-unix/X1")
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// Dial("/tmp/launch-123/:0") // connect to net.Dial("unix", "", "/tmp/launch-123/:0")
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// Dial("hostname:2.1") // connect to net.Dial("tcp", "", "hostname:6002")
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// Dial("tcp/hostname:1.0") // connect to net.Dial("tcp", "", "hostname:6001")
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func Dial(display string) (*Conn, os.Error) {
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var err os.Error
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c := new(Conn)
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if display[0] == '/' {
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c.conn, err = net.Dial("unix", "", display)
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if err != nil {
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fmt.Printf("cannot connect: %v\n", err)
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return nil, err
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}
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} else {
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parts := strings.Split(display, ":", 2)
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host := parts[0]
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port := 0
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if len(parts) > 1 {
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parts = strings.Split(parts[1], ".", 2)
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port, _ = strconv.Atoi(parts[0])
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if len(parts) > 1 {
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c.defaultScreen, _ = strconv.Atoi(parts[1])
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}
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}
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display = fmt.Sprintf("%s:%d", host, port+6000)
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c.conn, err = net.Dial("tcp", "", display)
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if err != nil {
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fmt.Printf("cannot connect: %v\n", err)
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return nil, err
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}
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c, err := connect(display)
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if err != nil {
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return nil, err
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}
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// TODO: get these from .Xauthority
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var authName, authData []byte
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// Get authentication data
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authName, authData, err := readAuthority(c.host, c.display)
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if err != nil {
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return nil, err
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}
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// Assume that the authentication protocol is "MIT-MAGIC-COOKIE-1".
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if authName != "MIT-MAGIC-COOKIE-1" || len(authData) != 16 {
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return nil, os.NewError("unsupported auth protocol " + authName)
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}
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buf := make([]byte, 12+pad(len(authName))+pad(len(authData)))
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buf[0] = 'l'
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buf[0] = 0x6c
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buf[1] = 0
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put16(buf[2:], 11)
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put16(buf[4:], 0)
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put16(buf[6:], uint16(len(authName)))
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put16(buf[8:], uint16(len(authData)))
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put16(buf[10:], 0)
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copy(buf[12:], authName)
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copy(buf[12:], strings.Bytes(authName))
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copy(buf[12+pad(len(authName)):], authData)
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if _, err = c.conn.Write(buf); err != nil {
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return nil, err
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@ -396,3 +388,77 @@ func getClientMessageData(b []byte, v *ClientMessageData) int {
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}
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return 20
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}
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func connect(display string) (*Conn, os.Error) {
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if len(display) == 0 {
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display = os.Getenv("DISPLAY")
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}
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display0 := display
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if len(display) == 0 {
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return nil, os.NewError("empty display string")
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}
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colonIdx := strings.LastIndex(display, ":")
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if colonIdx < 0 {
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return nil, os.NewError("bad display string: " + display0)
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}
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var protocol, socket string
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c := new(Conn)
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if display[0] == '/' {
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socket = display[0:colonIdx]
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} else {
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slashIdx := strings.LastIndex(display, "/")
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if slashIdx >= 0 {
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protocol = display[0:slashIdx]
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c.host = display[slashIdx+1 : colonIdx]
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} else {
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c.host = display[0:colonIdx]
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}
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}
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display = display[colonIdx+1 : len(display)]
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if len(display) == 0 {
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return nil, os.NewError("bad display string: " + display0)
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}
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var scr string
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dotIdx := strings.LastIndex(display, ".")
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if dotIdx < 0 {
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c.display = display[0:]
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} else {
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c.display = display[0:dotIdx]
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scr = display[dotIdx+1:]
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}
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dispnum, err := strconv.Atoui(c.display)
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if err != nil {
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return nil, os.NewError("bad display string: " + display0)
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}
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if len(scr) != 0 {
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c.defaultScreen, err = strconv.Atoi(scr)
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if err != nil {
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return nil, os.NewError("bad display string: " + display0)
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}
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}
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// Connect to server
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if len(socket) != 0 {
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c.conn, err = net.Dial("unix", "", socket+":"+c.display)
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} else if len(c.host) != 0 {
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if protocol == "" {
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protocol = "tcp"
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}
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c.conn, err = net.Dial(protocol, "", c.host+":"+strconv.Uitoa(6000+dispnum))
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} else {
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c.conn, err = net.Dial("unix", "", "/tmp/.X11-unix/X"+c.display)
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}
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if err != nil {
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return nil, os.NewError("cannot connect to " + display0 + ": " + err.String())
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}
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return c, nil
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}
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