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Pull request: 3443 dhcp broadcast vol.2

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Merge in DNS/adguard-home from 3443-dhcp-broadcast-vol.2 to master

Closes #3443.

Squashed commit of the following:

commit a85af89cb43f2489126fe3c12366fc034e89f59d
Merge: 72eb3a88 a4e07827
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Sep 30 18:08:19 2021 +0300

    Merge branch 'master' into 3443-dhcp-broadcast-vol.2

commit 72eb3a8853540b06ee1096decf50e836b539fe45
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Sep 30 18:03:19 2021 +0300

    dhcpd: imp code readability

commit 2d1fbc40d04a4125855d6be9f02e09d15430150d
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Sep 30 14:16:59 2021 +0300

    dhcpd: imp tests

commit 889fad3084ad2b81edfc12100e2ce29d323227ba
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Sep 29 20:09:25 2021 +0300

    dhcpd: imp code, docs

commit 1fd6b2346ff66e033bceaa169aed751be5822ca8
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Sep 23 16:08:18 2021 +0300

    dhcpd: unicast to mac address
This commit is contained in:
Eugene Burkov
2021-09-30 18:28:19 +03:00
parent a4e078271c
commit da86620288
12 changed files with 531 additions and 231 deletions
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30
internal/dhcpd/broadcast_bsd.go
View File

@@ -5,33 +5,17 @@ package dhcpd
import (
"net"
"github.com/AdguardTeam/golibs/log"
"github.com/insomniacslk/dhcp/dhcpv4"
)
// broadcast sends resp to the broadcast address specific for network interface.
func (s *v4Server) broadcast(peer net.Addr, conn net.PacketConn, resp *dhcpv4.DHCPv4) {
// peer is expected to be of type *net.UDPConn as the server4.NewServer
// initializes it.
udpPeer, ok := peer.(*net.UDPAddr)
if !ok {
log.Error("dhcpv4: peer is of unexpected type %T", peer)
return
}
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 conn.WriteTo causes
// errors while writing to the addresses that belong to another
// interface. So, use the broadcast address specific for the binded
// interface.
udpPeer.IP = s.conf.broadcastIP
// 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
log.Debug("dhcpv4: sending to %s: %s", peer, resp.Summary())
if _, err := conn.WriteTo(resp.ToBytes(), peer); err != nil {
log.Error("dhcpv4: conn.Write to %s failed: %s", peer, err)
}
return c.udpConn.WriteTo(respData, peer)
}