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tcp.go
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tcp.go
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package phantomtcp
import (
"crypto/tls"
"encoding/binary"
"errors"
"fmt"
"io"
"math/rand"
"net"
"os"
"strconv"
"strings"
"sync"
"syscall"
"time"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
)
type ConnectionInfo struct {
Link gopacket.LinkLayer
IP gopacket.NetworkLayer
TCP layers.TCP
}
type SynInfo struct {
Number uint32
Option uint32
}
var ConnSyn sync.Map
var ConnInfo4 [65536]chan *ConnectionInfo
var ConnInfo6 [65536]chan *ConnectionInfo
var TFOCookies sync.Map
var TFOPayload [64][]byte
var TFOSynID uint8 = 0
const domainBytes = "abcdefghijklmnopqrstuvwxyz0123456789-"
func IsAddressInUse(err error) bool {
//return errors.Is(err, syscall.EADDRINUSE)
errOpError, ok := err.(*net.OpError)
if !ok {
return false
}
errSyscallError, ok := errOpError.Err.(*os.SyscallError)
if !ok {
return false
}
errErrno, ok := errSyscallError.Err.(syscall.Errno)
if !ok {
return false
}
if errErrno == syscall.EADDRINUSE {
return true
}
return false
}
func IsNormalError(err error) bool {
errOpError, ok := err.(*net.OpError)
if !ok {
return false
}
switch e := errOpError.Err.(type) {
case *os.SyscallError:
errErrno, ok := e.Err.(syscall.Errno)
if !ok {
return false
}
if errErrno == syscall.ETIMEDOUT ||
errErrno == syscall.ECONNREFUSED ||
errErrno == syscall.ECONNRESET {
return true
}
default:
//logPrintln(2, reflect.TypeOf(e))
return true
}
return false
}
func AddConn(synAddr string, option uint32) {
result, ok := ConnSyn.LoadOrStore(synAddr, SynInfo{1, option})
if ok {
info := result.(SynInfo)
info.Number++
info.Option = option
ConnSyn.Store(synAddr, info)
}
}
func DelConn(synAddr string) {
result, ok := ConnSyn.Load(synAddr)
if ok {
info := result.(SynInfo)
if info.Number > 1 {
info.Number--
ConnSyn.Store(synAddr, info)
} else {
ConnSyn.Delete(synAddr)
}
}
}
func GetLocalAddr(name string, ipv6 bool) (*net.TCPAddr, error) {
if name == "" {
return nil, nil
}
inf, err := net.InterfaceByName(name)
if err != nil {
return nil, err
}
addrs, _ := inf.Addrs()
for _, addr := range addrs {
localAddr, ok := addr.(*net.IPNet)
if ok {
var laddr *net.TCPAddr
ip4 := localAddr.IP.To4()
if ipv6 {
if ip4 != nil || localAddr.IP[0] == 0xfe {
continue
}
ip := make([]byte, 16)
copy(ip[:16], localAddr.IP)
laddr = &net.TCPAddr{IP: ip[:], Port: 0}
} else {
if ip4 == nil {
continue
}
ip := make([]byte, 4)
copy(ip[:4], ip4)
laddr = &net.TCPAddr{IP: ip[:], Port: 0}
}
return laddr, nil
}
}
return nil, nil
}
func (server *PhantomInterface) Dial(host string, port int, b []byte) (net.Conn, *ConnectionInfo, error) {
raddrs, err := server.GetRemoteAddresses(host, port)
if err != nil || raddrs == nil {
return nil, nil, err
}
var conn net.Conn
if server.Protocol == WIREGUARD {
conn, err = WireGuardDialTCP(server.Device, raddrs[rand.Intn(len(raddrs))])
if err != nil {
return nil, nil, err
}
if b != nil {
_, err = conn.Write(b)
}
return conn, nil, err
}
device := server.Device
offset := 0
length := 0
if b != nil {
if server.Hint&OPT_MODIFY != 0 {
if server.Hint&OPT_TFO != 0 {
length = len(b)
} else {
if b[0] == 0x16 {
offset, length = GetSNI(b)
} else {
offset, length = GetHost(b)
}
}
}
}
if PassiveMode || length == 0 {
raddr := raddrs[rand.Intn(len(raddrs))]
var laddr *net.TCPAddr = nil
if device != "" {
laddr, err = GetLocalAddr(device, raddr.IP.To4() == nil)
if err != nil {
return nil, nil, err
}
}
conn, err = net.DialTCP("tcp", laddr, raddr)
if err != nil {
return nil, nil, err
}
if server.Protocol != 0 {
server.ProxyHandshake(conn, nil, host, port)
if err != nil {
conn.Close()
return nil, nil, err
}
}
if b != nil {
if length > 0 {
cut := offset + length/2
tos := 1 << 2
if server.Hint&OPT_TTL != 0 {
tos = int(server.TTL) << 2
}
err = SendWithOption(conn, b[:cut], tos, 1)
if err != nil {
conn.Close()
}
_, err = conn.Write(b[cut:])
if err != nil {
conn.Close()
}
} else {
_, err = conn.Write(b)
if err != nil {
conn.Close()
}
}
}
return conn, nil, err
} else {
rand.Seed(time.Now().UnixNano())
fakepaylen := 1280
if len(b) < fakepaylen {
fakepaylen = len(b)
}
fakepayload := make([]byte, fakepaylen)
copy(fakepayload, b[:fakepaylen])
cut := offset + length/2
var tfo_payload []byte = nil
if (server.Hint & (OPT_TFO | OPT_HTFO)) != 0 {
if (server.Hint & OPT_TFO) != 0 {
tfo_payload = b
} else {
tfo_payload = b[:cut]
}
} else if server.Hint&OPT_RAND != 0 {
_, err = rand.Read(fakepayload)
if err != nil {
logPrintln(1, err)
}
} else {
min_dot := offset + length
max_dot := offset
for i := offset; i < offset+length; i++ {
if fakepayload[i] == '.' {
if i < min_dot {
min_dot = i
}
if i > max_dot {
max_dot = i
}
} else {
fakepayload[i] = domainBytes[rand.Intn(len(domainBytes))]
}
}
if min_dot == max_dot {
min_dot = offset
}
cut = (min_dot + max_dot) / 2
}
var synpacket *ConnectionInfo
for i := 0; i < 5; i++ {
raddr := raddrs[rand.Intn(len(raddrs))]
laddr, err := GetLocalAddr(device, raddr.IP.To4() == nil)
if err != nil {
return nil, nil, errors.New("invalid device")
}
conn, synpacket, err = DialConnInfo(laddr, raddr, server, tfo_payload)
if err != nil {
if IsNormalError(err) {
continue
}
return nil, nil, err
}
break
}
if synpacket == nil {
if conn != nil {
conn.Close()
}
return nil, nil, errors.New("connection does not exist")
}
if (server.Hint & OPT_DELAY) != 0 {
time.Sleep(time.Second)
}
synpacket.TCP.Seq++
if server.Protocol != 0 {
err = server.ProxyHandshake(conn, synpacket, host, port)
if err != nil {
conn.Close()
return nil, nil, err
}
if server.Protocol == HTTPS {
conn.Write(b)
return conn, synpacket, nil
}
}
count := 1
if (server.Hint & (OPT_TFO | OPT_HTFO)) != 0 {
if (server.Hint & OPT_HTFO) != 0 {
_, err = conn.Write(b[cut:])
if err != nil {
conn.Close()
return nil, nil, err
}
}
synpacket.TCP.Seq += uint32(len(b))
} else {
if server.Hint&OPT_MODE2 != 0 {
synpacket.TCP.Seq += uint32(cut)
fakepayload = fakepayload[cut:]
count = 2
} else {
err = ModifyAndSendPacket(synpacket, fakepayload, server.Hint, server.TTL, count)
if err != nil {
conn.Close()
return nil, nil, err
}
}
SegOffset := 0
if server.Hint&(OPT_SSEG|OPT_1SEG) != 0 {
if server.Hint&OPT_1SEG != 0 {
SegOffset = 1
} else {
SegOffset = 4
}
_, err = conn.Write(b[:SegOffset])
if err != nil {
conn.Close()
return nil, nil, err
}
}
_, err = conn.Write(b[SegOffset:cut])
if err != nil {
conn.Close()
return nil, nil, err
}
err = ModifyAndSendPacket(synpacket, fakepayload, server.Hint, server.TTL, count)
if err != nil {
conn.Close()
return nil, nil, err
}
_, err = conn.Write(b[cut:])
if err != nil {
conn.Close()
return nil, nil, err
}
synpacket.TCP.Seq += uint32(len(b))
if server.Hint&OPT_SAT != 0 {
_, err = rand.Read(fakepayload)
if err != nil {
conn.Close()
return nil, nil, err
}
err = ModifyAndSendPacket(synpacket, fakepayload, server.Hint, server.TTL, 2)
}
}
return conn, synpacket, err
}
}
func (server *PhantomInterface) Keep(client, conn net.Conn, connInfo *ConnectionInfo) {
fakepayload := make([]byte, 1500)
go func() {
var b [1460]byte
for {
n, err := client.Read(b[:])
if err != nil {
conn.Close()
return
}
err = ModifyAndSendPacket(connInfo, fakepayload, server.Hint, server.TTL, 2)
if err != nil {
conn.Close()
return
}
_, err = conn.Write(b[:n])
if err != nil {
conn.Close()
return
}
connInfo.TCP.Seq += uint32(n)
}
}()
io.Copy(client, conn)
}
func (server *PhantomInterface) GetRemoteAddresses(host string, port int) ([]*net.TCPAddr, error) {
switch server.Protocol {
case DIRECT:
return server.ResolveTCPAddrs(host, port)
case REDIRECT:
if server.Address != "" {
var str_port string
var err error
host, str_port, err = net.SplitHostPort(server.Address)
if err != nil {
return nil, err
}
port, err = strconv.Atoi(str_port)
if err != nil {
return nil, err
}
}
return server.ResolveTCPAddrs(host, port)
case NAT64:
addrs, err := server.ResolveTCPAddrs(host, port)
if err != nil {
return nil, err
}
tcpAddrs := make([]*net.TCPAddr, len(addrs))
for i, addr := range addrs {
proxy := server.Address + addr.IP.String()
tcpAddrs[i] = &net.TCPAddr{IP: net.ParseIP(proxy), Port: port}
}
return tcpAddrs, nil
case WIREGUARD:
if server.DNS == "" {
return nil, nil
}
return server.ResolveTCPAddrs(host, port)
default:
host, str_port, err := net.SplitHostPort(server.Address)
if err != nil {
return nil, err
}
port, err := strconv.Atoi(str_port)
if err != nil {
return nil, err
}
return server.ResolveTCPAddrs(host, port)
}
}
func (server *PhantomInterface) ProxyHandshake(conn net.Conn, synpacket *ConnectionInfo, host string, port int) error {
var err error
proxy_err := errors.New("invalid proxy")
hint := server.Hint & OPT_MODIFY
var proxy_seq uint32 = 0
switch server.Protocol {
case REDIRECT:
case NAT64:
case HTTP:
{
request := []byte(fmt.Sprintf("CONNECT %s HTTP/1.1\r\n\r\n", net.JoinHostPort(host, string(port))))
fakepayload := make([]byte, len(request))
var n int = 0
if synpacket != nil {
if hint&OPT_SSEG != 0 {
n, err = conn.Write(request[:4])
if err != nil {
return err
}
} else if hint&OPT_MODE2 != 0 {
n, err = conn.Write(request[:10])
if err != nil {
return err
}
}
proxy_seq += uint32(n)
err = ModifyAndSendPacket(synpacket, fakepayload, hint, server.TTL, 2)
if err != nil {
return err
}
if hint&OPT_SSEG != 0 {
n, err = conn.Write(request[4:])
} else if hint&OPT_MODE2 != 0 {
n, err = conn.Write(request[10:])
} else {
n, err = conn.Write(request)
}
if err != nil {
return err
}
proxy_seq += uint32(n)
} else {
n, err = conn.Write(request)
if err != nil || n == 0 {
return err
}
}
var response [128]byte
n, err = conn.Read(response[:])
if err != nil || !strings.HasPrefix(string(response[:n]), "HTTP/1.1 200 ") {
return errors.New("failed to connect to proxy")
}
}
case HTTPS:
{
var b [264]byte
if synpacket != nil {
err := ModifyAndSendPacket(synpacket, b[:], hint, server.TTL, 2)
if err != nil {
return err
}
}
conf := &tls.Config{
InsecureSkipVerify: true,
}
conn = tls.Client(conn, conf)
request := []byte(fmt.Sprintf("CONNECT %s HTTP/1.1\r\n\r\n",
net.JoinHostPort(host, string(port))))
n, err := conn.Write(request)
if err != nil || n == 0 {
return err
}
var response [128]byte
n, err = conn.Read(response[:])
if err != nil || !strings.HasPrefix(string(response[:n]), "HTTP/1.1 200 ") {
return errors.New("failed to connect to proxy")
}
}
case SOCKS4:
{
var b [264]byte
if synpacket != nil {
err := ModifyAndSendPacket(synpacket, b[:], hint, server.TTL, 2)
if err != nil {
return err
}
}
copy(b[:], []byte{0x04, 0x01})
binary.BigEndian.PutUint16(b[2:], uint16(port))
requestLen := 0
ip := net.ParseIP(host).To4()
if ip != nil {
copy(b[4:], ip[:4])
b[8] = 0
requestLen = 9
} else {
copy(b[4:], []byte{0, 0, 0, 1, 0})
copy(b[9:], []byte(host))
requestLen = 9 + len(host)
b[requestLen] = 0
requestLen++
}
n, err := conn.Write(b[:requestLen])
if err != nil {
return err
}
proxy_seq += uint32(n)
n, err = conn.Read(b[:8])
if err != nil {
return err
}
if n < 8 || b[0] != 0 || b[1] != 90 {
return proxy_err
}
}
case SOCKS5:
{
var b [264]byte
if synpacket != nil {
err := ModifyAndSendPacket(synpacket, b[:], hint, server.TTL, 2)
if err != nil {
return err
}
}
n, err := conn.Write([]byte{0x05, 0x01, 0x00})
if err != nil {
return err
}
proxy_seq += uint32(n)
_, err = conn.Read(b[:])
if err != nil {
return err
}
if b[0] != 0x05 {
return proxy_err
}
if server.DNS != "" {
_, ips := NSLookup(host, server.Hint, server.DNS)
logPrintln(1, host, ips)
if ips != nil {
ip := ips[rand.Intn(len(ips))]
ip4 := ip.To4()
if ip4 != nil {
copy(b[:], []byte{0x05, 0x01, 0x00, 0x01})
copy(b[4:], ip4[:4])
binary.BigEndian.PutUint16(b[8:], uint16(port))
n, err = conn.Write(b[:10])
} else {
copy(b[:], []byte{0x05, 0x01, 0x00, 0x04})
copy(b[4:], ip[:16])
binary.BigEndian.PutUint16(b[20:], uint16(port))
n, err = conn.Write(b[:22])
}
host = ""
}
}
if host != "" {
copy(b[:], []byte{0x05, 0x01, 0x00, 0x03})
hostLen := len(host)
b[4] = byte(hostLen)
copy(b[5:], []byte(host))
binary.BigEndian.PutUint16(b[5+hostLen:], uint16(port))
n, err = conn.Write(b[:7+hostLen])
}
if err != nil {
return err
}
proxy_seq += uint32(n)
n, err = conn.Read(b[:])
if err != nil {
return err
}
if n < 2 {
return proxy_err
}
if b[0] != 0x05 {
return proxy_err
}
if b[1] != 0x00 {
return proxy_err
}
}
case WIREGUARD:
default:
return proxy_err
}
if synpacket != nil {
synpacket.TCP.Seq += proxy_seq
}
return nil
}
func relay(left, right net.Conn) (int64, int64, error) {
type res struct {
N int64
Err error
}
ch := make(chan res)
go func() {
n, err := io.Copy(right, left)
right.SetDeadline(time.Now()) // wake up the other goroutine blocking on right
left.SetDeadline(time.Now()) // wake up the other goroutine blocking on left
ch <- res{n, err}
}()
n, err := io.Copy(left, right)
right.SetDeadline(time.Now()) // wake up the other goroutine blocking on right
left.SetDeadline(time.Now()) // wake up the other goroutine blocking on left
rs := <-ch
if err == nil {
err = rs.Err
}
return n, rs.N, err
}