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