52 lines
1.6 KiB
Go
52 lines
1.6 KiB
Go
//go:build aix || darwin || dragonfly || linux || netbsd || solaris
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// +build aix darwin dragonfly linux netbsd solaris
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package dhcpd
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import (
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"net"
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"github.com/AdguardTeam/golibs/log"
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"github.com/insomniacslk/dhcp/dhcpv4"
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)
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// broadcast sends resp to the broadcast address specific for network interface.
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func (s *v4Server) broadcast(peer net.Addr, conn net.PacketConn, resp *dhcpv4.DHCPv4) {
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respData := resp.ToBytes()
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log.Debug("dhcpv4: sending to %s: %s", peer, resp.Summary())
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// This write to 0xffffffff reverts some behavior changes made in
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// https://github.com/AdguardTeam/AdGuardHome/issues/3289. The DHCP
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// server should broadcast the message to 0xffffffff but it's
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// inconsistent with the actual mental model of DHCP implementation
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// which requires the network interface selection to bind to.
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//
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// See https://github.com/AdguardTeam/AdGuardHome/issues/3480 and
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// https://github.com/AdguardTeam/AdGuardHome/issues/3366.
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//
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// See also https://github.com/AdguardTeam/AdGuardHome/issues/3539.
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if _, err := conn.WriteTo(respData, peer); err != nil {
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log.Error("dhcpv4: conn.Write to %s failed: %s", peer, err)
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}
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// peer is expected to be of type *net.UDPConn as the server4.NewServer
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// initializes it.
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udpPeer, ok := peer.(*net.UDPAddr)
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if !ok {
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log.Error("dhcpv4: peer is of unexpected type %T", peer)
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return
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}
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// Broadcast the message one more time using the interface-specific
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// broadcast address.
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udpPeer.IP = s.conf.broadcastIP
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log.Debug("dhcpv4: sending to %s: %s", peer, resp.Summary())
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if _, err := conn.WriteTo(respData, peer); err != nil {
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log.Error("dhcpv4: conn.Write to %s failed: %s", peer, err)
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}
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}
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