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helpers_linux.go
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/
helpers_linux.go
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//go:build linux
// +build linux
package main
import (
"bytes"
"context"
"io"
"net"
"net/netip"
"os"
"reflect"
"syscall"
"unsafe"
)
const (
SO_REUSEPORT = 15
TCP_FASTOPEN = 23
IP_BIND_ADDRESS_NO_PORT = 24
)
type ListenConfig struct {
ReusePort bool
FastOpen bool
DeferAccept bool
}
func (lc ListenConfig) Listen(ctx context.Context, network, address string) (net.Listener, error) {
ln := &net.ListenConfig{
Control: func(network, address string, conn syscall.RawConn) error {
return conn.Control(func(fd uintptr) {
if lc.ReusePort {
syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, SO_REUSEPORT, 1)
}
if lc.FastOpen {
syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN, 16*1024)
}
if lc.DeferAccept {
syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, syscall.TCP_DEFER_ACCEPT, 1)
}
})
},
}
return ln.Listen(ctx, network, address)
}
func (lc ListenConfig) ListenPacket(ctx context.Context, network, address string) (net.PacketConn, error) {
ln := &net.ListenConfig{
Control: func(network, address string, conn syscall.RawConn) error {
return conn.Control(func(fd uintptr) {
if lc.ReusePort {
syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, SO_REUSEPORT, 1)
}
})
},
}
return ln.ListenPacket(ctx, network, address)
}
type DailerController struct {
BindInterface string
}
func (dc DailerController) Control(network, addr string, c syscall.RawConn) (err error) {
return c.Control(func(fd uintptr) {
if ip, err := netip.ParseAddr(dc.BindInterface); err == nil {
var sa syscall.Sockaddr
if ip.Is4() {
ip4 := ip.As4()
sa = &syscall.SockaddrInet4{
Addr: [4]byte{ip4[0], ip4[1], ip4[2], ip4[3]},
}
} else {
ip6 := ip.As16()
sa = &syscall.SockaddrInet6{
Addr: [16]byte{
ip6[0], ip6[1], ip6[2], ip6[3],
ip6[4], ip6[5], ip6[6], ip6[7],
ip6[8], ip6[9], ip6[10], ip6[11],
ip6[12], ip6[13], ip6[14], ip6[15],
},
}
}
const IP_BIND_ADDRESS_NO_PORT = 24
err = syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IP, IP_BIND_ADDRESS_NO_PORT, 1)
if err != nil {
return
}
err = syscall.Bind(int(fd), sa)
} else if dc.BindInterface != "" {
err = syscall.BindToDevice(int(fd), dc.BindInterface)
}
})
}
//go:linkname setsockopt syscall.setsockopt
func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
func SetTcpBrutalRate(tc *net.TCPConn, rate uint64) (err error) {
var c syscall.RawConn
c, err = tc.SyscallConn()
if err != nil {
return
}
return c.Control(func(fd uintptr) {
const TCP_BRUTAL_PARAMS = 23301
err = syscall.SetsockoptString(int(fd), syscall.IPPROTO_TCP, syscall.TCP_CONGESTION, "brutal")
if err != nil {
err = os.NewSyscallError("setsockopt IPPROTO_TCP TCP_CONGESTION brutal", err)
}
params := struct {
Rate uint64
CwndGain uint32
}{
Rate: rate,
CwndGain: 20, // hysteria2 default
}
err = setsockopt(int(fd), syscall.IPPROTO_TCP, TCP_BRUTAL_PARAMS, unsafe.Pointer(¶ms), unsafe.Sizeof(params))
if err != nil {
err = os.NewSyscallError("setsockopt IPPROTO_TCP TCP_BRUTAL_PARAMS", err)
}
return
})
}
func RedirectStderrTo(file *os.File) error {
return syscall.Dup3(int(file.Fd()), 2, 0)
}
func SetProcessName(name string) error {
argv0str := (*reflect.StringHeader)(unsafe.Pointer(&os.Args[0]))
argv0 := (*[1 << 30]byte)(unsafe.Pointer(argv0str.Data))[:len(name)+1]
n := copy(argv0, name+"\x00")
if n < len(argv0) {
argv0[n] = 0
}
return nil
}
func ReadHTTPHeader(tc *net.TCPConn) ([]byte, *net.TCPConn, error) {
f, err := tc.File()
if err != nil {
return nil, tc, err
}
b := make([]byte, os.Getpagesize())
n, _, err := syscall.Recvfrom(int(f.Fd()), b, syscall.MSG_PEEK)
if err != nil {
return nil, tc, err
}
if n == 0 {
return nil, tc, io.EOF
}
if b[0] < 'A' || b[0] > 'Z' {
return nil, tc, io.EOF
}
n = bytes.Index(b, []byte{'\r', '\n', '\r', '\n'})
if n < 0 {
return nil, tc, io.EOF
}
b = b[:n+4]
n, err = tc.Read(b)
return b, tc, err
}