Xray-core/transport/internet/sockopt_darwin.go
2023-10-16 10:24:28 -04:00

253 lines
7.5 KiB
Go

package internet
import (
network "net"
"os"
"syscall"
"unsafe"
"github.com/xtls/xray-core/common/net"
"golang.org/x/sys/unix"
)
const (
// TCP_FASTOPEN_SERVER is the value to enable TCP fast open on darwin for server connections.
TCP_FASTOPEN_SERVER = 0x01
// TCP_FASTOPEN_CLIENT is the value to enable TCP fast open on darwin for client connections.
TCP_FASTOPEN_CLIENT = 0x02 // nolint: revive,stylecheck
// syscall.TCP_KEEPINTVL is missing on some darwin architectures.
sysTCP_KEEPINTVL = 0x101 // nolint: revive,stylecheck
)
const (
PfOut = 2
IOCOut = 0x40000000
IOCIn = 0x80000000
IOCInOut = IOCIn | IOCOut
IOCPARMMask = 0x1FFF
LEN = 4*16 + 4*4 + 4*1
// #define _IOC(inout,group,num,len) (inout | ((len & IOCPARMMask) << 16) | ((group) << 8) | (num))
// #define _IOWR(g,n,t) _IOC(IOCInOut, (g), (n), sizeof(t))
// #define DIOCNATLOOK _IOWR('D', 23, struct pfioc_natlook)
DIOCNATLOOK = IOCInOut | ((LEN & IOCPARMMask) << 16) | ('D' << 8) | 23
)
// OriginalDst uses ioctl to read original destination from /dev/pf
func OriginalDst(la, ra net.Addr) (net.IP, int, error) {
f, err := os.Open("/dev/pf")
if err != nil {
return net.IP{}, -1, newError("failed to open device /dev/pf").Base(err)
}
defer f.Close()
fd := f.Fd()
nl := struct { // struct pfioc_natlook
saddr, daddr, rsaddr, rdaddr [16]byte
sxport, dxport, rsxport, rdxport [4]byte
af, proto, protoVariant, direction uint8
}{
af: syscall.AF_INET,
proto: syscall.IPPROTO_TCP,
direction: PfOut,
}
var raIP, laIP net.IP
var raPort, laPort int
switch la.(type) {
case *net.TCPAddr:
raIP = ra.(*net.TCPAddr).IP
laIP = la.(*net.TCPAddr).IP
raPort = ra.(*net.TCPAddr).Port
laPort = la.(*net.TCPAddr).Port
case *net.UDPAddr:
raIP = ra.(*net.UDPAddr).IP
laIP = la.(*net.UDPAddr).IP
raPort = ra.(*net.UDPAddr).Port
laPort = la.(*net.UDPAddr).Port
}
if raIP.To4() != nil {
if laIP.IsUnspecified() {
laIP = net.ParseIP("127.0.0.1")
}
copy(nl.saddr[:net.IPv4len], raIP.To4())
copy(nl.daddr[:net.IPv4len], laIP.To4())
}
if raIP.To16() != nil && raIP.To4() == nil {
if laIP.IsUnspecified() {
laIP = net.ParseIP("::1")
}
copy(nl.saddr[:], raIP)
copy(nl.daddr[:], laIP)
}
nl.sxport[0], nl.sxport[1] = byte(raPort>>8), byte(raPort)
nl.dxport[0], nl.dxport[1] = byte(laPort>>8), byte(laPort)
if _, _, errno := syscall.Syscall(syscall.SYS_IOCTL, fd, DIOCNATLOOK, uintptr(unsafe.Pointer(&nl))); errno != 0 {
return net.IP{}, -1, os.NewSyscallError("ioctl", err)
}
odPort := nl.rdxport
var odIP net.IP
switch nl.af {
case syscall.AF_INET:
odIP = make(net.IP, net.IPv4len)
copy(odIP, nl.rdaddr[:net.IPv4len])
case syscall.AF_INET6:
odIP = make(net.IP, net.IPv6len)
copy(odIP, nl.rdaddr[:])
}
return odIP, int(net.PortFromBytes(odPort[:2])), nil
}
func applyOutboundSocketOptions(network string, address string, fd uintptr, config *SocketConfig) error {
if isTCPSocket(network) {
tfo := config.ParseTFOValue()
if tfo > 0 {
tfo = TCP_FASTOPEN_CLIENT
}
if tfo >= 0 {
if err := unix.SetsockoptInt(int(fd), unix.IPPROTO_TCP, unix.TCP_FASTOPEN, tfo); err != nil {
return err
}
}
if config.Interface != "" {
InterfaceIndex := getInterfaceIndexByName(config.Interface)
if InterfaceIndex != 0 {
if err := unix.SetsockoptInt(int(fd), syscall.IPPROTO_IP, syscall.IP_BOUND_IF, InterfaceIndex); err != nil {
return newError("failed to set Interface").Base(err)
}
}
}
if config.TcpKeepAliveIdle > 0 || config.TcpKeepAliveInterval > 0 {
if config.TcpKeepAliveIdle > 0 {
if err := unix.SetsockoptInt(int(fd), unix.IPPROTO_TCP, unix.TCP_KEEPALIVE, int(config.TcpKeepAliveInterval)); err != nil {
return newError("failed to set TCP_KEEPINTVL", err)
}
}
if config.TcpKeepAliveInterval > 0 {
if err := unix.SetsockoptInt(int(fd), unix.IPPROTO_TCP, sysTCP_KEEPINTVL, int(config.TcpKeepAliveIdle)); err != nil {
return newError("failed to set TCP_KEEPIDLE", err)
}
}
if err := unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_KEEPALIVE, 1); err != nil {
return newError("failed to set SO_KEEPALIVE", err)
}
} else if config.TcpKeepAliveInterval < 0 || config.TcpKeepAliveIdle < 0 {
if err := unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_KEEPALIVE, 0); err != nil {
return newError("failed to unset SO_KEEPALIVE", err)
}
}
if config.TcpNoDelay {
if err := unix.SetsockoptInt(int(fd), unix.IPPROTO_TCP, unix.TCP_NODELAY, 1); err != nil {
return newError("failed to set TCP_NODELAY", err)
}
}
}
return nil
}
func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig) error {
if isTCPSocket(network) {
tfo := config.ParseTFOValue()
if tfo > 0 {
tfo = TCP_FASTOPEN_SERVER
}
if tfo >= 0 {
if err := unix.SetsockoptInt(int(fd), unix.IPPROTO_TCP, unix.TCP_FASTOPEN, tfo); err != nil {
return err
}
}
if config.Interface != "" {
InterfaceIndex := getInterfaceIndexByName(config.Interface)
if InterfaceIndex != 0 {
if err := unix.SetsockoptInt(int(fd), syscall.IPPROTO_IP, syscall.IP_BOUND_IF, InterfaceIndex); err != nil {
return newError("failed to set Interface").Base(err)
}
}
}
if config.TcpKeepAliveIdle > 0 || config.TcpKeepAliveInterval > 0 {
if config.TcpKeepAliveIdle > 0 {
if err := unix.SetsockoptInt(int(fd), unix.IPPROTO_TCP, unix.TCP_KEEPALIVE, int(config.TcpKeepAliveInterval)); err != nil {
return newError("failed to set TCP_KEEPINTVL", err)
}
}
if config.TcpKeepAliveInterval > 0 {
if err := unix.SetsockoptInt(int(fd), unix.IPPROTO_TCP, sysTCP_KEEPINTVL, int(config.TcpKeepAliveIdle)); err != nil {
return newError("failed to set TCP_KEEPIDLE", err)
}
}
if err := unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_KEEPALIVE, 1); err != nil {
return newError("failed to set SO_KEEPALIVE", err)
}
} else if config.TcpKeepAliveInterval < 0 || config.TcpKeepAliveIdle < 0 {
if err := unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_KEEPALIVE, 0); err != nil {
return newError("failed to unset SO_KEEPALIVE", err)
}
}
}
return nil
}
func bindAddr(fd uintptr, address []byte, port uint32) error {
setReuseAddr(fd)
setReusePort(fd)
var sockaddr unix.Sockaddr
switch len(address) {
case net.IPv4len:
a4 := &unix.SockaddrInet4{
Port: int(port),
}
copy(a4.Addr[:], address)
sockaddr = a4
case net.IPv6len:
a6 := &unix.SockaddrInet6{
Port: int(port),
}
copy(a6.Addr[:], address)
sockaddr = a6
default:
return newError("unexpected length of ip")
}
return unix.Bind(int(fd), sockaddr)
}
func setReuseAddr(fd uintptr) error {
if err := unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1); err != nil {
return newError("failed to set SO_REUSEADDR").Base(err).AtWarning()
}
return nil
}
func setReusePort(fd uintptr) error {
if err := unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1); err != nil {
return newError("failed to set SO_REUSEPORT").Base(err).AtWarning()
}
return nil
}
func getInterfaceIndexByName(name string) int {
ifaces, err := network.Interfaces()
if err == nil {
for _, iface := range ifaces {
if (iface.Flags&network.FlagUp == network.FlagUp) && (iface.Flags&network.FlagLoopback != network.FlagLoopback) {
addrs, _ := iface.Addrs()
for _, addr := range addrs {
if ipnet, ok := addr.(*network.IPNet); ok && !ipnet.IP.IsLoopback() {
if ipnet.IP.To4() != nil {
if iface.Name == name {
return iface.Index
}
}
}
}
}
}
}
return 0
}