31 lines
1004 B
Go
31 lines
1004 B
Go
//go:build darwin || linux
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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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