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package main
import (
"fmt"
"os"
"log"
"net"
"errors"
"strconv"
"io"
)
const (
USAGE = "Usage: mcproxy <Host:Port> <RemoteHost:RemotePort> [Version|1.7/-]"
)
func printError(a... interface{}) int {
fmt.Fprintln(os.Stderr, a)
return 1
}
func printUsage() int {
return printError(USAGE)
}
func main() {
os.Exit(Create())
}
func Create() int {
if len(os.Args) < 2 || len(os.Args) > 4 { return printUsage() }
localHost := ParseAddress(os.Args[1])
if localHost == nil { return printUsage() }
localAddress, _, err := localHost.Resolve()
if err != nil { return printError(err) }
remoteHost := ParseAddress(os.Args[2])
if remoteHost == nil { return printUsage() }
_, _, err = remoteHost.Resolve()
if err != nil { return printError(err) }
version := "1.7"
if len(os.Args) > 3 { version = os.Args[3] }
fmt.Println("Listening to:", os.Args[1])
fmt.Println("Proxying to:", os.Args[2])
fmt.Println()
log.SetPrefix("[mcproxy] ")
log.SetOutput(os.Stdout)
err = Start(localAddress, remoteHost, version)
if err != nil {
log.Fatalln("Unable to start proxy:", err.Error())
}
return 0
}
func Start(localAddress *net.TCPAddr, remoteAddress *ServerAddress, version string) (err error) {
local, err := net.ListenTCP("tcp", localAddress)
if err != nil { return }
defer local.Close()
log.Println("Network listener started and is waiting for requests.")
if version == "1.7" { log.Println("Transforming handshakes for version 1.7") }
for {
conn, err := local.AcceptTCP()
if err == nil {
go proxy(conn, remoteAddress, version)
} else {
log.Println("Connection failed:", err)
}
}
}
func transformHandshake(local *net.TCPConn, remote *net.TCPConn, address *ConnectAddress) (err error) {
localMinecraft := &MinecraftStream { local }
packetID, reader, err := packetReader(localMinecraft)
if packetID != 0x00 { return errors.New("Invalid handshake packet: " + strconv.Itoa(packetID)) }
version, err := readVarInt(reader); if err != nil { return }
clientAddress, err := readString(reader); if err != nil { return }
clientPort, err := readShort(reader); if err != nil { return }
request, err := readVarInt(reader); if err != nil { return }
log.Println("Client connected with", clientAddress, clientPort, "Version", version, "Request", request)
log.Println("Connecting to server with", address.Host, address.Port, "Version", version, "Request", request)
writer, err := packetWriter(0x00); if err != nil { return }
err = writeVarInt(writer, version); if err != nil { return }
err = writeString(writer, address.Host); if err != nil { return }
err = writeShort(writer, address.Port); if err != nil { return }
err = writeVarInt(writer, request); if err != nil { return }
err = writeVarInt(remote, writer.Len()); if err != nil { return }
_, err = remote.Write(writer.Bytes()); return
}
func proxy(local *net.TCPConn, remoteHost *ServerAddress, version string) {
defer local.Close()
remoteAddress, connectAddress, err := remoteHost.Resolve()
if err != nil { log.Println("Cannot resolve address:", err.Error()); return }
log.Println("Proxying", local.RemoteAddr(), "to", remoteAddress)
remote, err := net.DialTCP("tcp", nil, remoteAddress)
if err != nil { log.Println("Unable to connect:", err); return }
defer remote.Close()
if version == "1.7" {
err = transformHandshake(local, remote, connectAddress)
if err != nil { log.Println("Unable to transform handshake:", err)}
}
copyError := make(chan string)
go copyStream(local, remote, copyError, true)
go copyStream(remote, local, copyError, false)
copyErr := <- copyError
if len(copyErr) > 0 {
log.Println(copyErr)
}
log.Println("Disconnected", local.RemoteAddr(), "from", remoteAddress)
}
func copyStream(from, to net.Conn, out chan<- string, client bool) {
_, err := io.Copy(to, from)
if err != nil {
name := "SERVER"; if client { name = "CLIENT" }
out <- "An error occurred with [" + name + "|" + from.RemoteAddr().String() + "]\n" + err.Error()
} else {
out <- ""
}
}