AdGuardHome/internal/dhcpd/broadcast_bsd.go

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//go:build freebsd || openbsd
// +build freebsd openbsd
package dhcpd
import (
"net"
)
// broadcast sends resp to the broadcast address specific for network interface.
func (c *dhcpConn) broadcast(respData []byte, peer *net.UDPAddr) (n int, err error) {
// Despite the fact that server4.NewIPv4UDPConn explicitly sets socket
// options to allow broadcasting, it also binds the connection to a
// specific interface. On FreeBSD and OpenBSD net.UDPConn.WriteTo
// causes errors while writing to the addresses that belong to another
// interface. So, use the broadcast address specific for the interface
// bound.
peer.IP = c.bcastIP
return c.udpConn.WriteTo(respData, peer)
}