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Pull request 1830: 5712-rollback-dhcp

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Merge in DNS/adguard-home from 5712-rollback-dhcp to master

Updates #5712.

Squashed commit of the following:

commit 3d53a6385ad08dfad0b7ac28bb057cf25608554d
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Apr 14 16:30:18 2023 +0300

    dhcpd: imp import

commit 86bd55b0225b5d9067bd0bf9e6def1e52dd27124
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Apr 14 16:26:41 2023 +0300

    all: return todo

commit 629c548989a464a9cf461fffc0815b99a00c4851
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Apr 14 16:24:10 2023 +0300

    all: log changes

commit e4c369e55cbcc7c73d73d8df333996862e1e146a
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Apr 14 16:03:03 2023 +0300

    dhcpd: revert raw for darwin
This commit is contained in:
Eugene Burkov
2023-04-14 16:58:07 +03:00
parent 18acdf9b09
commit 6d402dc86c
8 changed files with 675 additions and 160 deletions
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51
internal/dhcpd/v4_unix.go
View File

@@ -20,7 +20,6 @@ import (
"github.com/go-ping/ping"
"github.com/insomniacslk/dhcp/dhcpv4"
"github.com/insomniacslk/dhcp/dhcpv4/server4"
"github.com/mdlayher/packet"
"golang.org/x/exp/slices"
)
@@ -1132,56 +1131,6 @@ func (s *v4Server) packetHandler(conn net.PacketConn, peer net.Addr, req *dhcpv4
s.send(peer, conn, req, resp)
}
// send writes resp for peer to conn considering the req's parameters according
// to RFC-2131.
//
// See https://datatracker.ietf.org/doc/html/rfc2131#section-4.1.
func (s *v4Server) send(peer net.Addr, conn net.PacketConn, req, resp *dhcpv4.DHCPv4) {
switch giaddr, ciaddr, mtype := req.GatewayIPAddr, req.ClientIPAddr, resp.MessageType(); {
case giaddr != nil && !giaddr.IsUnspecified():
// Send any return messages to the server port on the BOOTP
// relay agent whose address appears in giaddr.
peer = &net.UDPAddr{
IP: giaddr,
Port: dhcpv4.ServerPort,
}
if mtype == dhcpv4.MessageTypeNak {
// Set the broadcast bit in the DHCPNAK, so that the relay agent
// broadcasts it to the client, because the client may not have
// a correct network address or subnet mask, and the client may not
// be answering ARP requests.
resp.SetBroadcast()
}
case mtype == dhcpv4.MessageTypeNak:
// Broadcast any DHCPNAK messages to 0xffffffff.
case ciaddr != nil && !ciaddr.IsUnspecified():
// Unicast DHCPOFFER and DHCPACK messages to the address in
// ciaddr.
peer = &net.UDPAddr{
IP: ciaddr,
Port: dhcpv4.ClientPort,
}
case !req.IsBroadcast() && req.ClientHWAddr != nil:
// Unicast DHCPOFFER and DHCPACK messages to the client's
// hardware address and yiaddr.
peer = &dhcpUnicastAddr{
Addr: packet.Addr{HardwareAddr: req.ClientHWAddr},
yiaddr: resp.YourIPAddr,
}
default:
// Go on since peer is already set to broadcast.
}
pktData := resp.ToBytes()
log.Debug("dhcpv4: sending %d bytes to %s: %s", len(pktData), peer, resp.Summary())
_, err := conn.WriteTo(pktData, peer)
if err != nil {
log.Error("dhcpv4: conn.Write to %s failed: %s", peer, err)
}
}
// Start starts the IPv4 DHCP server.
func (s *v4Server) Start() (err error) {
defer func() { err = errors.Annotate(err, "dhcpv4: %w") }()