initial commit

syscalls_linux.go

@@ -0,0 +1,34 @@
+// +build linux
+
+package water
+
+import (
+	"strings"
+	"syscall"
+	"unsafe"
+)
+
+const (
+	cIFF_TUN   = 0x0001
+	cIFF_TAP   = 0x0002
+	cIFF_NO_PI = 0x1000
+)
+
+type ifReq struct {
+	Name  [0x10]byte
+	Flags uint16
+	pad   [0x28 - 0x10 - 2]byte
+}
+
+func createInterface(fd uintptr, ifName string, flags uint16) (createdIFName string, err error) {
+	var req ifReq
+	req.Flags = flags
+	copy(req.Name[:], ifName)
+	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, fd, uintptr(syscall.TUNSETIFF), uintptr(unsafe.Pointer(&req)))
+	if errno != 0 {
+		err = errno
+		return
+	}
+	createdIFName = strings.Trim(string(req.Name[:]), "\x00")
+	return
+}