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-rw-r--r--conn_default.go89
-rw-r--r--conn_linux.go69
2 files changed, 106 insertions, 52 deletions
diff --git a/conn_default.go b/conn_default.go
index 14ed56c..92135cb 100644
--- a/conn_default.go
+++ b/conn_default.go
@@ -11,7 +11,9 @@ package main
import (
"golang.org/x/sys/unix"
"net"
+ "os"
"runtime"
+ "syscall"
)
/* This code is meant to be a temporary solution
@@ -87,6 +89,18 @@ func listenNet(network string, port int) (*net.UDPConn, int, error) {
return conn, uaddr.Port, nil
}
+func extractErrno(err error) error {
+ opErr, ok := err.(*net.OpError)
+ if !ok {
+ return nil
+ }
+ syscallErr, ok := opErr.Err.(*os.SyscallError)
+ if !ok {
+ return nil
+ }
+ return syscallErr.Err
+}
+
func CreateBind(uport uint16, device *Device) (Bind, uint16, error) {
var err error
var bind NativeBind
@@ -94,13 +108,15 @@ func CreateBind(uport uint16, device *Device) (Bind, uint16, error) {
port := int(uport)
bind.ipv4, port, err = listenNet("udp4", port)
- if err != nil {
+ if err != nil && extractErrno(err) != syscall.EAFNOSUPPORT {
return nil, 0, err
}
bind.ipv6, port, err = listenNet("udp6", port)
- if err != nil {
+ if err != nil && extractErrno(err) != syscall.EAFNOSUPPORT {
+ return nil, 0, err
bind.ipv4.Close()
+ bind.ipv4 = nil
return nil, 0, err
}
@@ -108,8 +124,13 @@ func CreateBind(uport uint16, device *Device) (Bind, uint16, error) {
}
func (bind *NativeBind) Close() error {
- err1 := bind.ipv4.Close()
- err2 := bind.ipv6.Close()
+ var err1, err2 error
+ if bind.ipv4 != nil {
+ err1 = bind.ipv4.Close()
+ }
+ if bind.ipv6 != nil {
+ err2 = bind.ipv6.Close()
+ }
if err1 != nil {
return err1
}
@@ -117,6 +138,9 @@ func (bind *NativeBind) Close() error {
}
func (bind *NativeBind) ReceiveIPv4(buff []byte) (int, Endpoint, error) {
+ if bind.ipv4 == nil {
+ return 0, nil, syscall.EAFNOSUPPORT
+ }
n, endpoint, err := bind.ipv4.ReadFromUDP(buff)
if endpoint != nil {
endpoint.IP = endpoint.IP.To4()
@@ -125,6 +149,9 @@ func (bind *NativeBind) ReceiveIPv4(buff []byte) (int, Endpoint, error) {
}
func (bind *NativeBind) ReceiveIPv6(buff []byte) (int, Endpoint, error) {
+ if bind.ipv6 == nil {
+ return 0, nil, syscall.EAFNOSUPPORT
+ }
n, endpoint, err := bind.ipv6.ReadFromUDP(buff)
return n, (*NativeEndpoint)(endpoint), err
}
@@ -133,8 +160,14 @@ func (bind *NativeBind) Send(buff []byte, endpoint Endpoint) error {
var err error
nend := endpoint.(*NativeEndpoint)
if nend.IP.To4() != nil {
+ if bind.ipv4 == nil {
+ return syscall.EAFNOSUPPORT
+ }
_, err = bind.ipv4.WriteToUDP(buff, (*net.UDPAddr)(nend))
} else {
+ if bind.ipv6 == nil {
+ return syscall.EAFNOSUPPORT
+ }
_, err = bind.ipv6.WriteToUDP(buff, (*net.UDPAddr)(nend))
}
return err
@@ -157,31 +190,29 @@ func (bind *NativeBind) SetMark(mark uint32) error {
if fwmarkIoctl == 0 {
return nil
}
- fd4, err1 := bind.ipv4.SyscallConn()
- fd6, err2 := bind.ipv6.SyscallConn()
- if err1 != nil {
- return err1
- }
- if err2 != nil {
- return err2
- }
- err3 := fd4.Control(func(fd uintptr) {
- err1 = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, fwmarkIoctl, int(mark))
- })
- err4 := fd6.Control(func(fd uintptr) {
- err2 = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, fwmarkIoctl, int(mark))
- })
- if err1 != nil {
- return err1
- }
- if err2 != nil {
- return err2
- }
- if err3 != nil {
- return err3
- }
- if err4 != nil {
- return err4
+ if bind.ipv4 != nil {
+ fd, err := bind.ipv4.SyscallConn()
+ if err != nil {
+ return err
+ }
+ err = fd.Control(func(fd uintptr) {
+ err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, fwmarkIoctl, int(mark))
+ })
+ if err != nil {
+ return err
+ }
+ }
+ if bind.ipv6 != nil {
+ fd, err := bind.ipv6.SyscallConn()
+ if err != nil {
+ return err
+ }
+ err = fd.Control(func(fd uintptr) {
+ err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, fwmarkIoctl, int(mark))
+ })
+ if err != nil {
+ return err
+ }
}
return nil
}
diff --git a/conn_linux.go b/conn_linux.go
index 0227f04..2b15d05 100644
--- a/conn_linux.go
+++ b/conn_linux.go
@@ -24,6 +24,7 @@ import (
"net"
"strconv"
"sync"
+ "syscall"
"unsafe"
)
@@ -140,40 +141,45 @@ func CreateBind(port uint16, device *Device) (*NativeBind, uint16, error) {
go bind.routineRouteListener(device)
bind.sock6, port, err = create6(port)
- if err != nil {
+ if err != nil && err != syscall.EAFNOSUPPORT {
bind.netlinkCancel.Cancel()
- return nil, port, err
+ return nil, 0, err
}
bind.sock4, port, err = create4(port)
- if err != nil {
+ if err != nil && err != syscall.EAFNOSUPPORT {
bind.netlinkCancel.Cancel()
unix.Close(bind.sock6)
+ return nil, 0, err
}
- return &bind, port, err
+ return &bind, port, nil
}
func (bind *NativeBind) SetMark(value uint32) error {
- err := unix.SetsockoptInt(
- bind.sock6,
- unix.SOL_SOCKET,
- unix.SO_MARK,
- int(value),
- )
+ if bind.sock6 != -1 {
+ err := unix.SetsockoptInt(
+ bind.sock6,
+ unix.SOL_SOCKET,
+ unix.SO_MARK,
+ int(value),
+ )
- if err != nil {
- return err
+ if err != nil {
+ return err
+ }
}
- err = unix.SetsockoptInt(
- bind.sock4,
- unix.SOL_SOCKET,
- unix.SO_MARK,
- int(value),
- )
+ if bind.sock4 != -1 {
+ err := unix.SetsockoptInt(
+ bind.sock4,
+ unix.SOL_SOCKET,
+ unix.SO_MARK,
+ int(value),
+ )
- if err != nil {
- return err
+ if err != nil {
+ return err
+ }
}
bind.lastMark = value
@@ -187,9 +193,14 @@ func closeUnblock(fd int) error {
}
func (bind *NativeBind) Close() error {
- err1 := closeUnblock(bind.sock6)
- err2 := closeUnblock(bind.sock4)
- err3 := bind.netlinkCancel.Cancel()
+ var err1, err2, err3 error
+ if bind.sock6 != -1 {
+ err1 = closeUnblock(bind.sock6)
+ }
+ if bind.sock4 != -1 {
+ err2 = closeUnblock(bind.sock4)
+ }
+ err3 = bind.netlinkCancel.Cancel()
if err1 != nil {
return err1
@@ -202,6 +213,9 @@ func (bind *NativeBind) Close() error {
func (bind *NativeBind) ReceiveIPv6(buff []byte) (int, Endpoint, error) {
var end NativeEndpoint
+ if bind.sock6 == -1 {
+ return 0, nil, syscall.EAFNOSUPPORT
+ }
n, err := receive6(
bind.sock6,
buff,
@@ -212,6 +226,9 @@ func (bind *NativeBind) ReceiveIPv6(buff []byte) (int, Endpoint, error) {
func (bind *NativeBind) ReceiveIPv4(buff []byte) (int, Endpoint, error) {
var end NativeEndpoint
+ if bind.sock4 == -1 {
+ return 0, nil, syscall.EAFNOSUPPORT
+ }
n, err := receive4(
bind.sock4,
buff,
@@ -223,8 +240,14 @@ func (bind *NativeBind) ReceiveIPv4(buff []byte) (int, Endpoint, error) {
func (bind *NativeBind) Send(buff []byte, end Endpoint) error {
nend := end.(*NativeEndpoint)
if !nend.isV6 {
+ if bind.sock4 == -1 {
+ return syscall.EAFNOSUPPORT
+ }
return send4(bind.sock4, nend, buff)
} else {
+ if bind.sock6 == -1 {
+ return syscall.EAFNOSUPPORT
+ }
return send6(bind.sock6, nend, buff)
}
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.