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add dhcp failing test

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soypat
2025-06-17 02:07:11 -03:00
parent 47eae76dcf
commit 2133966a16
17 changed files with 596 additions and 195 deletions
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dhcpv4/client.go
+28 -3
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@@ -10,6 +10,7 @@ import (
"net"
"github.com/soypat/lneto"
"github.com/soypat/lneto/ipv4"
)
type Client struct {
@@ -63,6 +64,24 @@ func (c *Client) Protocol() uint64 { return uint64(lneto.IPProtoUDP) }
func (c *Client) LocalPort() uint16 { return DefaultClientPort }
func (c *Client) ConnectionID() *uint64 { return &c.connID }
func (c *Client) setIP(b []byte, frameOffset int) {
if frameOffset < 28 {
return // Not an IP/UDP frame.
}
ifrm, _ := ipv4.NewFrame(b)
ifrm.SetID((uint16(c.currentXID) ^ uint16(c.currentXID>>16)) + uint16(c.state))
if c.state > StateInit {
// TODO(soypat): Document why disabling ToS used by DHCP server may cause Request to fail.
// Apparently server sets ToS=192. Uncommenting this line causes DHCP to fail on my setup.
// If left fixed at 192, DHCP does not work.
// If left fixed at 0, DHCP does not work.
// Apparently ToS is a function of which state of DHCP one is in. Not sure why code below works.
// Note: Not exactly needed for all servers.
const ecnmask = 0b1100_0000
ifrm.SetToS(ecnmask)
}
}
func (c *Client) Encapsulate(carrierFrame []byte, frameOffset int) (int, error) {
if c.isClosed() {
return 0, net.ErrClosed
@@ -98,6 +117,9 @@ func (c *Client) Encapsulate(carrierFrame []byte, frameOffset int) (int, error)
nextState = StateSelecting
case StateSelecting:
if c.offer == ([4]byte{}) {
return 0, nil // Offer not yet received.
}
// Send out request, we know we've received an offer by now.
optBuf = AppendOption(optBuf, OptMessageType, byte(MsgRequest))
optBuf = AppendOption(optBuf, OptRequestedIPaddress, c.offer[:]...)
@@ -108,8 +130,7 @@ func (c *Client) Encapsulate(carrierFrame []byte, frameOffset int) (int, error)
return 0, errors.New("unhandled state")
}
if len(c.reqHostname) > 0 {
optBuf = append(optBuf, byte(OptHostName), byte(len(c.hostname)))
optBuf = append(optBuf, c.hostname...)
optBuf = AppendOptionString(optBuf, OptHostName, c.reqHostname)
}
optBuf = append(optBuf, 0xff) // End mark.
options := frm.OptionsPayload()
@@ -118,6 +139,7 @@ func (c *Client) Encapsulate(carrierFrame []byte, frameOffset int) (int, error)
}
c.setHeader(frm)
n := copy(options, optBuf)
c.setIP(carrierFrame, frameOffset)
c.state = nextState
return optionsOffset + n, nil
}
@@ -155,6 +177,7 @@ func (c *Client) Demux(carrierData []byte, frameOffset int) error {
// Lock in on this offer.
c.gateway = *frm.GIAddr()
c.offer = *frm.YIAddr()
c.svip = *frm.SIAddr()
}
case StateRequesting:
@@ -223,7 +246,9 @@ func (c *Client) setHeader(frm Frame) {
frm.SetXID(c.currentXID)
frm.SetHardware(1, 6, 0)
frm.SetSecs(1)
// copy(frm.CIAddr()[:], c.offer[:])
if c.state == StateBound {
// copy(frm.CIAddr()[:], c.offer[:])
}
copy(frm.SIAddr()[:], c.svip[:])
copy(frm.YIAddr()[:], c.offer[:])
copy(frm.CHAddrAs6()[:], c.clientMAC[:])