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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:72eb3a88a4e07827Author: 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
31 lines
1.1 KiB
Go
31 lines
1.1 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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)
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// broadcast sends resp to the broadcast address specific for network interface.
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func (c *dhcpConn) broadcast(respData []byte, peer *net.UDPAddr) (n int, err error) {
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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 n, err = c.udpConn.WriteTo(respData, peer); err != nil {
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return n, err
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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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peer.IP = c.bcastIP
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return c.udpConn.WriteTo(respData, peer)
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}
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