From b57e89f69a4367faa3b6a0e41063bf144145d762 Mon Sep 17 00:00:00 2001
From: Dmitri Goutnik <5332688+dmgk@users.noreply.github.com>
Date: Wed, 13 Mar 2019 18:07:49 -0500
Subject: Add partial (client) binding support for BSD (#260)

---
 dhcpv4/bindtodevice_bsd.go | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 dhcpv4/bindtodevice_bsd.go

(limited to 'dhcpv4/bindtodevice_bsd.go')

diff --git a/dhcpv4/bindtodevice_bsd.go b/dhcpv4/bindtodevice_bsd.go
new file mode 100644
index 0000000..0f1b581
--- /dev/null
+++ 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)
+}
-- 
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