Add partial (client) binding support for BSD (#260)

insomniacslk · Mar 13, 2019 · b57e89f · b57e89f
1 parent 4795153
commit b57e89f
Showing 1 changed file with 18 additions and 0 deletions.
diff --git a/dhcpv4/bindtodevice_bsd.go b/dhcpv4/bindtodevice_bsd.go
@@ -0,0 +1,18 @@
+// +build freebsd openbsd netbsd
+
+package dhcpv4
+
+import (
+	"net"
+	"syscall"
+)
+
+// BindToInterface emulates linux's SO_BINDTODEVICE option for a socket by using
+// IP_RECVIF.
+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_RECVIF, iface.Index)
+}