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// SPDX-FileCopyrightText: 2022 UnionTech Software Technology Co., Ltd.
//
// SPDX-License-Identifier: GPL-3.0-or-later
package x
import (
"bufio"
"errors"
"fmt"
"io"
"net"
"os"
"strconv"
"strings"
)
func NewConn() (*Conn, error) {
return NewConnDisplay("")
}
func NewConnDisplay(display string) (*Conn, error) {
c := new(Conn)
err := c.connectDisplay(display)
if err != nil {
return nil, err
}
c.bufReader = bufio.NewReader(c.conn)
c.in.init(&c.ioMu)
c.out.bw = bufio.NewWriter(c.conn)
c.ridAllocator.init(c.setup.ResourceIdBase, c.setup.ResourceIdMask)
go c.readLoop()
go c.eventSendLoop()
return c, nil
}
func (c *Conn) connectDisplay(display string) error {
err := c.dial(display)
if err != nil {
return err
}
return c.postConnect()
}
// dial initializes the actual net connection with X.
func (c *Conn) dial(display string) error {
if len(display) == 0 {
display = os.Getenv("DISPLAY")
}
display0 := display
if len(display) == 0 {
return errors.New("empty display string")
}
colonIdx := strings.LastIndex(display, ":")
if colonIdx < 0 {
return errors.New("bad display string: " + display0)
}
var protocol, socket string
if display[0] == '/' {
socket = display[0:colonIdx]
} else {
slashIdx := strings.LastIndex(display, "/")
if slashIdx >= 0 {
protocol = display[0:slashIdx]
c.host = display[slashIdx+1 : colonIdx]
} else {
c.host = display[0:colonIdx]
}
}
display = display[colonIdx+1:]
if len(display) == 0 {
return errors.New("bad display string: " + display0)
}
var scr string
dotIdx := strings.LastIndex(display, ".")
if dotIdx < 0 {
c.display = display[0:]
} else {
c.display = display[0:dotIdx]
scr = display[dotIdx+1:]
}
var err error
c.DisplayNumber, err = strconv.Atoi(c.display)
if err != nil || c.DisplayNumber < 0 {
return errors.New("bad display string: " + display0)
}
if scr != "" {
c.ScreenNumber, err = strconv.Atoi(scr)
if err != nil {
return errors.New("bad display string: " + display0)
}
}
logPrintf("socket: %q, protocol: %q\n", socket, protocol)
// Connect to server
if len(socket) != 0 {
c.conn, err = net.Dial("unix", socket+":"+c.display)
} else if len(c.host) != 0 {
if protocol == "" {
protocol = "tcp"
}
logPrintln("dial tcp")
c.conn, err = net.Dial(protocol,
c.host+":"+strconv.Itoa(6000+c.DisplayNumber))
} else {
logPrintln("dial unix")
c.conn, err = net.Dial("unix", "/tmp/.X11-unix/X"+c.display)
}
if err != nil {
return errors.New("cannot connect to " + display0 + ": " + err.Error())
}
return nil
}
// do the postConnect action after Conn get it's underly net.Conn
func (c *Conn) postConnect() error {
// Get authentication data
authName, authData, err := readAuthority(c.host, c.display)
noAuth := false
if err != nil {
logPrintf("Could not get authority info: %v", err)
logPrintln("Trying connection without authority info...")
authName = ""
authData = []byte{}
noAuth = true
}
// Assume that the authentication protocol is "MIT-MAGIC-COOKIE-1".
if !noAuth && (authName != "MIT-MAGIC-COOKIE-1" || len(authData) != 16) {
return errors.New("unsupported auth protocol " + authName)
}
bufLen := 12 + len(authName) + Pad(len(authName)) + len(authData) + Pad(len(authData))
buf := make([]byte, bufLen)
buf[0] = 0x6c
buf[1] = 0
Put16(buf[2:], 11)
Put16(buf[4:], 0)
Put16(buf[6:], uint16(len(authName)))
Put16(buf[8:], uint16(len(authData)))
Put16(buf[10:], 0)
copy(buf[12:], []byte(authName))
copy(buf[12+len(authName)+Pad(len(authName)):], authData)
if _, err = c.conn.Write(buf); err != nil {
return err
}
head := make([]byte, 8)
if _, err = io.ReadFull(c.conn, head[0:8]); err != nil {
return err
}
respType := head[0]
major := Get16(head[2:])
minor := Get16(head[4:])
dataLen := Get16(head[6:])
if major != 11 || minor != 0 {
return fmt.Errorf("x protocol version mismatch: %d.%d", major, minor)
}
buf = make([]byte, 8+dataLen*4)
copy(buf, head)
if _, err = io.ReadFull(c.conn, buf[8:]); err != nil {
return err
}
if respType == ResponseTypeError {
reasonLen := head[1]
reason := buf[8 : 8+reasonLen]
return fmt.Errorf("x protocol authentication refused: %s",
string(reason))
}
var setup Setup
r := NewReaderFromData(buf)
err = readSetup(r, &setup)
if err != nil {
return err
}
c.setup = &setup
/* Make sure requested screen number is in bounds for this server */
if c.ScreenNumber >= len(setup.Roots) {
return errors.New("invalid screen")
}
return nil
}
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