add 32-bit build support for freebsd

Author: hakansa

internal/wgfreebsd/client_freebsd.go

@@ -194,7 +194,7 @@ func (c *Client) ConfigureDevice(name string, cfg wgtypes.Config) error {
 	data := wgh.WGDataIO{
 		Name: dname,
 		Data: mem,
-		Size: uint64(sz),
+		Size: uint32(sz),
 	}
 
 	if err := c.ioctlWGDataIO(wgh.SIOCSWG, &data); err != nil {

internal/wgfreebsd/internal/nv/decode.go

@@ -13,7 +13,7 @@ import (
 
 // Unmarshal decodes a FreeBSD name-value list (nv(9)) to a Go map
 func Unmarshal(d []byte, out List) error {
-	sz := C.ulong(len(d))
+	sz := C.size_t(len(d))
 	dp := unsafe.Pointer(&d[0])
 	nvl := C.nvlist_unpack(dp, sz, 0)
 

internal/wgfreebsd/internal/nv/encode.go

@@ -44,7 +44,7 @@ func marshal(m List) (nvl *C.struct_nvlist, err error) {
 			C.nvlist_add_bool(nvl, ckey, C.bool(value))
 
 		case uint64:
-			C.nvlist_add_number(nvl, ckey, C.ulong(value))
+			C.nvlist_add_number(nvl, ckey, C.uint64_t(value))
 
 		case []byte:
 			sz := len(value)
@@ -55,7 +55,8 @@ func marshal(m List) (nvl *C.struct_nvlist, err error) {
 		case []List:
 			sz := len(value)
 			buf := C.malloc(C.size_t(C.sizeof_nvlist_ptr * sz))
-			items := (*[1<<30 - 1]*C.struct_nvlist)(buf)
+			p := (**C.struct_nvlist)(buf)
+			items := unsafe.Slice(p, sz)
 
 			for i, val := range value {
 				if items[i], err = marshal(val); err != nil {