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Update exec/control usage

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This commit is contained in:
世界
2022-08-16 18:19:48 +08:00
parent c165969399
commit 835ae1217b
6 changed files with 38 additions and 56 deletions
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46
common/redir/redir_linux.go
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@@ -3,35 +3,35 @@ package redir
import (
"net"
"net/netip"
"os"
"syscall"
"github.com/sagernet/sing/common"
"github.com/sagernet/sing/common/control"
M "github.com/sagernet/sing/common/metadata"
)
func GetOriginalDestination(conn net.Conn) (destination netip.AddrPort, err error) {
rawConn, err := conn.(syscall.Conn).SyscallConn()
if err != nil {
return
syscallConn, ok := common.Cast[syscall.Conn](conn)
if !ok {
return netip.AddrPort{}, os.ErrInvalid
}
var rawFd uintptr
err = rawConn.Control(func(fd uintptr) {
rawFd = fd
err = control.Conn(syscallConn, func(fd uintptr) error {
const SO_ORIGINAL_DST = 80
if conn.RemoteAddr().(*net.TCPAddr).IP.To4() != nil {
raw, err := syscall.GetsockoptIPv6Mreq(int(fd), syscall.IPPROTO_IP, SO_ORIGINAL_DST)
if err != nil {
return err
}
destination = netip.AddrPortFrom(M.AddrFromIP(raw.Multiaddr[4:8]), uint16(raw.Multiaddr[2])<<8+uint16(raw.Multiaddr[3]))
} else {
raw, err := syscall.GetsockoptIPv6MTUInfo(int(fd), syscall.IPPROTO_IPV6, SO_ORIGINAL_DST)
if err != nil {
return err
}
destination = netip.AddrPortFrom(M.AddrFromIP(raw.Addr.Addr[:]), raw.Addr.Port)
}
return nil
})
if err != nil {
return
}
const SO_ORIGINAL_DST = 80
if conn.RemoteAddr().(*net.TCPAddr).IP.To4() != nil {
raw, err := syscall.GetsockoptIPv6Mreq(int(rawFd), syscall.IPPROTO_IP, SO_ORIGINAL_DST)
if err != nil {
return netip.AddrPort{}, err
}
return netip.AddrPortFrom(M.AddrFromIP(raw.Multiaddr[4:8]), uint16(raw.Multiaddr[2])<<8+uint16(raw.Multiaddr[3])), nil
} else {
raw, err := syscall.GetsockoptIPv6MTUInfo(int(rawFd), syscall.IPPROTO_IPV6, SO_ORIGINAL_DST)
if err != nil {
return netip.AddrPort{}, err
}
return netip.AddrPortFrom(M.AddrFromIP(raw.Addr.Addr[:]), raw.Addr.Port), nil
}
return
}