/
server.go
141 lines (122 loc) · 2.62 KB
/
server.go
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package main
import (
"fmt"
"net"
"os"
"os/signal"
"strings"
"syscall"
"time"
"golang.org/x/sys/windows"
)
func spawnServer() {
srv, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%d", port))
if err != nil {
fmt.Println("sudo: error: unable to spawn server")
return
}
defer srv.Close()
verb := "runas"
exe, _ := os.Executable()
cwd, _ := os.Getwd()
args := "-client " + strings.Join(os.Args[1:], " ")
if !strings.Contains(args, fmt.Sprintf("%d", port)) {
args = fmt.Sprintf("-port %d %s", port, args)
}
verbPtr, _ := syscall.UTF16PtrFromString(verb)
exePtr, _ := syscall.UTF16PtrFromString(exe)
cwdPtr, _ := syscall.UTF16PtrFromString(cwd)
argPtr, _ := syscall.UTF16PtrFromString(args)
var showCmd int32 = 0 //0 = SW_HIDE, 1 = SW_NORMAL
err = windows.ShellExecute(0, verbPtr, exePtr, argPtr, cwdPtr, showCmd)
if err != nil {
fmt.Println("sudo: error:", err)
return
}
conn, err := srv.Accept()
if err != nil {
fmt.Println("sudo: error: unable to accept client")
return
}
//Stdio buffers
input := make(chan []byte, bufSize)
output := make(chan []byte, bufSize)
//Syscall notifications for terminating child processes
sc := make(chan os.Signal, 1)
signal.Notify(sc, syscall.SIGINT)
signal.Notify(sc, syscall.SIGKILL)
go readInput(input)
go readOutput(output, conn)
for {
select {
case o, ok := <-output:
if !ok {
continue
}
msgs, err := NewMsgIn(o)
if err != nil {
fmt.Println("sudo: error: unable to process msgs:", err)
fmt.Println(string(o))
}
for i := 0; i < len(msgs); i++ {
msg := msgs[i]
switch msg.Op {
case opError:
fmt.Printf("sudo: error: %s\n", string(msg.Data))
case opEOF:
return
case opStdout:
os.Stdout.Write(msg.Data)
case opStderr:
os.Stderr.Write(msg.Data)
case opDebug:
if debug {
fmt.Printf("sudo: debug: %s\n", string(msg.Data))
}
default:
fmt.Printf("sudo: error: unknown op: %d\n", msg.Op)
}
}
case i, ok := <-input:
if !ok {
continue
}
i = NewMsg(opStdin, i).Bytes()
conn.Write(i)
case _, ok := <-sc:
if ok {
return
}
default:
time.Sleep(time.Millisecond * 1)
}
}
}
func readInput(input chan []byte) {
for {
in := make([]byte, bufSize)
n, err := os.Stdin.Read(in)
if err != nil {
fmt.Printf("readInput: %v\n", err)
return
}
if n > 0 {
in = in[:n]
input <- in
}
}
}
func readOutput(output chan []byte, conn net.Conn) {
for {
out := make([]byte, buffer)
n, err := conn.Read(out)
if err != nil {
fmt.Printf("readOutput: %v\n", err)
return
}
if n > 0 {
out = out[:n]
output <- out
}
}
}