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add log warning to httptap

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This commit is contained in:
Patricio Whittingslow
2026-04-24 23:30:50 -03:00
parent 198db3789b
commit 67c42aa136
1 changed files with 10 additions and 0 deletions
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examples/httptap/dhcp.go
+10
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@@ -5,6 +5,7 @@ package main
import ( import (
"encoding/binary" "encoding/binary"
"fmt" "fmt"
"log/slog"
"net/netip" "net/netip"
"sync" "sync"
@@ -12,6 +13,7 @@ import (
"github.com/soypat/lneto/arp" "github.com/soypat/lneto/arp"
"github.com/soypat/lneto/dhcpv4" "github.com/soypat/lneto/dhcpv4"
"github.com/soypat/lneto/ethernet" "github.com/soypat/lneto/ethernet"
"github.com/soypat/lneto/internal"
"github.com/soypat/lneto/internal/ltesto" "github.com/soypat/lneto/internal/ltesto"
"github.com/soypat/lneto/ipv4" "github.com/soypat/lneto/ipv4"
"github.com/soypat/lneto/udp" "github.com/soypat/lneto/udp"
@@ -89,6 +91,12 @@ func (d *dhcpInterceptor) Write(b []byte) (int, error) {
return len(b), nil // Consumed by DHCP server, don't forward. return len(b), nil // Consumed by DHCP server, don't forward.
} }
d.rewriteEthernetDst(b) d.rewriteEthernetDst(b)
if len(b) >= sizeEthernet+sizeIPv4 &&
*(*[6]byte)(b[0:6]) == d.svMAC &&
binary.BigEndian.Uint16(b[12:14]) == uint16(ethernet.TypeIPv4) {
dstIP := *(*[4]byte)(b[sizeEthernet+16 : sizeEthernet+20])
internal.LogAttrs(slog.Default(), slog.LevelWarn, "ethernet-self-loop", internal.SlogAddr4("dstIP", &dstIP))
}
return d.inner.Write(b) return d.inner.Write(b)
} }
@@ -308,6 +316,8 @@ func (d *dhcpInterceptor) rewriteEthernetDst(b []byte) {
d.mu.Unlock() d.mu.Unlock()
if ok { if ok {
copy(b[0:6], mac[:]) copy(b[0:6], mac[:])
} else {
internal.LogAttrs(slog.Default(), slog.LevelWarn, "gateway-rewrite-miss", internal.SlogAddr4("dstIP", &dstIP))
} }
} }