Added OS-specific implementations for binding to a network device

3 files changed, 28 insertions, 1 deletions

diff --git a/dhcpv4/bindtodevice_darwin.go b/dhcpv4/bindtodevice_darwin.go
new file mode 100644
index 0000000..e9580ce
--- /dev/null
+++ b/dhcpv4/bindtodevice_darwin.go
@@ -0,0 +1,16 @@
+// +build darwin
+
+package dhcpv4
+
+import (
+	"net"
+	"syscall"
+)
+
+func BindToInterface(fd int, ifname string) error {
+	iface, err := net.InterfaceByName(ifname)
+	if err != nil {
+		return err
+	}
+	return syscall.SetsockoptInt(fd, syscall.IPPROTO_IP, syscall.IP_BOUND_IF, iface.Index)
+}
diff --git a/dhcpv4/bindtodevice_linux.go b/dhcpv4/bindtodevice_linux.go
new file mode 100644
index 0000000..957744a
--- /dev/null
+++ b/dhcpv4/bindtodevice_linux.go
@@ -0,0 +1,11 @@
+// +build linux
+
+package dhcpv4
+
+import (
+	"syscall"
+)
+
+func BindToInterface(fd int, ifname string) error {
+	return syscall.BindToDevice(fd, ifname)
+}
diff --git a/dhcpv4/client.go b/dhcpv4/client.go
index 145a7ef..55f303d 100644
--- a/dhcpv4/client.go
+++ b/dhcpv4/client.go
@@ -75,7 +75,7 @@ func (c *Client) Exchange(ifname string, d *DHCPv4) ([]DHCPv4, error) {
 	if err != nil {
 		return conversation, err
 	}
-	err = syscall.BindToDevice(fd, ifname)
+	err = BindToInterface(fd, ifname)
 	if err != nil {
 		return conversation, err
 	}