From 9d838d25e69c7eafadd4d37bb1b5378637feedf3 Mon Sep 17 00:00:00 2001
From: coyove <coyove@hotmail.com>
Date: Mon, 1 Jan 2018 16:09:20 +0800
Subject: [PATCH] Split sources

---
 proxy/httpmux.go       | 85 ----------------------------------------
 proxy/ssvpn_interop.go | 88 ++++++++++++++++++++++++++++++++++++++++++
 proxy/ssvpn_windows.go |  7 ++++
 3 files changed, 95 insertions(+), 85 deletions(-)
 create mode 100644 proxy/ssvpn_interop.go
 create mode 100644 proxy/ssvpn_windows.go

diff --git a/proxy/httpmux.go b/proxy/httpmux.go
index b46f384..0f4b99a 100644
--- a/proxy/httpmux.go
+++ b/proxy/httpmux.go
@@ -1,14 +1,8 @@
 package proxy
 
 import (
-	"encoding/binary"
-	"errors"
-	"strconv"
-	"syscall"
 	"time"
-	"unsafe"
 
-	"github.com/coyove/goflyway/pkg/fd"
 	"github.com/coyove/goflyway/pkg/logg"
 	"github.com/coyove/tcpmux"
 
@@ -59,82 +53,3 @@ CONTINUE:
 		return wrapper, err
 	}
 }
-
-func vpnDial(address string) (net.Conn, error) {
-	sock, err := fd.Socket(syscall.AF_INET)
-	if err != nil {
-		return nil, err
-	}
-
-	if err := protectFD(sock); err != nil {
-		return nil, err
-	}
-
-	return fd.DialWithFD(sock, address)
-}
-
-func protectFD(fd int) error {
-	sock, err := syscall.Socket(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
-	if err != nil {
-		return err
-	}
-
-	var addr syscall.SockaddrUnix
-	addr.Name = "protect_path"
-
-	if err := (syscall.Connect(sock, &addr)); err != nil {
-		return err
-	}
-
-	if err := sendFD(sock, fd); err != nil {
-		return err
-	}
-
-	ret := []byte{9}
-	if n, err := syscall.Read(sock, ret); err != nil {
-		return err
-	} else if n != 1 {
-		return errors.New("protecting failed")
-	}
-
-	syscall.Close(sock)
-
-	if ret[0] != 0 {
-		return errors.New("protecting failed")
-	}
-
-	return nil
-}
-
-var _int_value_one int = 1
-var _little_endian = *(*byte)(unsafe.Pointer(&_int_value_one)) == 1
-
-func sendFD(sock int, fd int) error {
-	cmsg := &syscall.Cmsghdr{
-		Level: syscall.SOL_SOCKET,
-		Type:  syscall.SCM_RIGHTS,
-	}
-
-	// cmsghdr.len may be uint64 or uint32, depending on the platform
-	ln := syscall.SizeofCmsghdr + strconv.IntSize/8
-	h := (*[8]byte)(unsafe.Pointer(&cmsg.Len))
-
-	if _little_endian {
-		h[0] = byte(ln)
-	} else {
-		var i interface{} = cmsg.Len
-		switch i.(type) {
-		case uint64:
-			binary.BigEndian.PutUint64(h[:8], uint64(ln))
-		case uint32:
-			binary.BigEndian.PutUint32(h[:4], uint32(ln))
-		}
-	}
-
-	buffer := make([]byte, cmsg.Len)
-
-	copy(buffer, (*[syscall.SizeofCmsghdr]byte)(unsafe.Pointer(cmsg))[:])
-	*(*int)(unsafe.Pointer(&buffer[syscall.SizeofCmsghdr])) = fd
-
-	return syscall.Sendmsg(sock, []byte{'!'}, buffer, nil, 0)
-}
diff --git a/proxy/ssvpn_interop.go b/proxy/ssvpn_interop.go
new file mode 100644
index 0000000..8f9e53e
--- /dev/null
+++ b/proxy/ssvpn_interop.go
@@ -0,0 +1,88 @@
+// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+
+package proxy
+
+import (
+	"errors"
+	"net"
+	"strconv"
+	"syscall"
+	"unsafe"
+
+	"github.com/coyove/goflyway/pkg/fd"
+)
+
+func vpnDial(address string) (net.Conn, error) {
+	sock, err := fd.Socket(syscall.AF_INET)
+	if err != nil {
+		return nil, err
+	}
+
+	// Send our conn fd to shadowsocks vpn thread for protection
+	if err := protectFD(sock); err != nil {
+		return nil, err
+	}
+
+	// If succeeded, this fd will be closed while we still need it.
+	// So we dial a new conn, replace its fd with this one
+	return fd.DialWithFD(sock, address)
+}
+
+func protectFD(fd int) error {
+	sock, err := syscall.Socket(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
+	if err != nil {
+		return err
+	}
+
+	var addr syscall.SockaddrUnix
+	addr.Name = "protect_path"
+
+	if err := (syscall.Connect(sock, &addr)); err != nil {
+		return err
+	}
+
+	if err := sendFD(sock, fd); err != nil {
+		return err
+	}
+
+	ret := []byte{9}
+	if n, err := syscall.Read(sock, ret); err != nil {
+		return err
+	} else if n != 1 {
+		return errors.New("protecting failed")
+	}
+
+	syscall.Close(sock)
+
+	if ret[0] != 0 {
+		return errors.New("protecting failed")
+	}
+
+	return nil
+}
+
+var _int_value_one int = 1
+var _little_endian = *(*byte)(unsafe.Pointer(&_int_value_one)) == 1
+
+func sendFD(sock int, fd int) error {
+	cmsg := &syscall.Cmsghdr{
+		Level: syscall.SOL_SOCKET,
+		Type:  syscall.SCM_RIGHTS,
+	}
+
+	ln := byte(syscall.SizeofCmsghdr + strconv.IntSize/8)
+	h := (*[8]byte)(unsafe.Pointer(&cmsg.Len))
+
+	if _little_endian {
+		h[0] = ln
+	} else {
+		h[3+4*(^cmsg.Len<<32>>63)] = ln
+	}
+
+	buffer := make([]byte, cmsg.Len)
+
+	copy(buffer, (*[syscall.SizeofCmsghdr]byte)(unsafe.Pointer(cmsg))[:])
+	*(*int)(unsafe.Pointer(&buffer[syscall.SizeofCmsghdr])) = fd
+
+	return syscall.Sendmsg(sock, []byte{'!'}, buffer, nil, 0)
+}
diff --git a/proxy/ssvpn_windows.go b/proxy/ssvpn_windows.go
new file mode 100644
index 0000000..c2f8748
--- /dev/null
+++ b/proxy/ssvpn_windows.go
@@ -0,0 +1,7 @@
+package proxy
+
+import "net"
+
+func vpnDial(address string) (net.Conn, error) {
+	panic("not on Windows")
+}