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dhcp working!

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soypat
2025-07-09 16:54:48 -03:00
parent 9c0e250cf6
commit 489e9951fa
10 changed files with 228 additions and 69 deletions
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examples/bridge/main.go
+27 -17
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@@ -6,6 +6,7 @@ import (
"errors"
"flag"
"fmt"
"log/slog"
"net"
"net/netip"
"os"
@@ -89,7 +90,7 @@ func run() (err error) {
}
fmt.Println("NIC hardware address:", net.HardwareAddr(nicHW[:]).String(), "bridgeHW:", net.HardwareAddr(brHW[:]).String(), "mtu:", mtu, "addr:", nicAddr.String())
var stack Stack
err = stack.Reset(brHW, nicAddr.Addr().Next(), uint16(mtu))
err = stack.Reset(brHW, netip.AddrFrom4([4]byte{}), uint16(mtu))
if err != nil {
return err
}
@@ -97,9 +98,7 @@ func run() (err error) {
if err != nil {
return err
}
var shark pcap.PacketBreakdown
buf := make([]byte, mtu)
var iframes []pcap.Frame
lastAction := time.Now()
dnsOngoing := false
for {
@@ -126,12 +125,6 @@ func run() (err error) {
if err != nil {
fmt.Println("ERR:ENCAPSULATE", err)
} else if nwrite > 0 {
iframes, err = shark.CaptureEthernet(iframes[:0], buf[:nwrite], 0)
if err != nil {
fmt.Println("OU", iframes, err.Error())
} else {
fmt.Println("OU", iframes)
}
n, err := iface.Write(buf[:nwrite])
if err != nil {
return err
@@ -145,12 +138,6 @@ func run() (err error) {
if err != nil {
return err
} else if nread > 0 {
iframes, err = shark.CaptureEthernet(iframes[:0], buf[:nread], 0)
if err != nil {
fmt.Println("IN", iframes, err.Error())
} else {
fmt.Println("IN", iframes)
}
err = stack.Demux(buf[:nread], 0)
if err != nil {
fmt.Println("ERR:DEMUX", err)
@@ -174,14 +161,36 @@ type Stack struct {
dhcp dhcpv4.Client
dns dns.Client
lookup dns.Message
// Packet capture and top level filtering.
shark pcap.PacketBreakdown
aux []pcap.Frame
}
func (s *Stack) Demux(b []byte, _ int) error {
func (s *Stack) Demux(b []byte, _ int) (err error) {
s.aux, err = s.shark.CaptureEthernet(s.aux[:0], b, 0)
if s.aux[len(s.aux)-1].Protocol != "DHCPv4" {
return nil
}
if err != nil {
fmt.Println("IN", s.aux, err.Error())
} else {
fmt.Println("IN", s.aux)
}
return s.link.Demux(b, 0)
}
func (s *Stack) Encapsulate(b []byte, _ int) (int, error) {
return s.link.Encapsulate(b, 0)
n, err := s.link.Encapsulate(b, 0)
if n > 0 {
iframes, errpcap := s.shark.CaptureEthernet(s.aux[:0], b[:n], 0)
if errpcap != nil {
fmt.Println("OU", iframes, errpcap.Error())
} else {
fmt.Println("OU", iframes)
}
}
return n, err
}
func (s *Stack) Reset(mac [6]byte, addr netip.Addr, mtu uint16) error {
@@ -227,6 +236,7 @@ func (s *Stack) Reset(mac [6]byte, addr netip.Addr, mtu uint16) error {
if err != nil {
return err
}
s.ip.SetLogger(slog.Default())
return nil
}