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send captured packets to server

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This commit is contained in:
Antoni Piasecki
2026-07-21 21:19:50 +02:00
parent 8a45d91e8d
commit 7ca7089476
3 changed files with 84 additions and 48 deletions
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46
server/main.go
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@@ -2,6 +2,7 @@ package main
import (
"encoding/binary"
"encoding/hex"
"fmt"
"log"
"net"
@@ -11,7 +12,6 @@ import (
"baalvpn/shared"
"github.com/songgao/packets/ethernet"
"github.com/songgao/water"
)
@@ -26,6 +26,7 @@ var (
peers = map[string]*Peer{}
peersMutex sync.Mutex
nextIP = 3
iface *water.Interface
)
func main() {
@@ -36,47 +37,25 @@ func main() {
config := water.Config{DeviceType: water.TAP}
config.Name = IFACE_NAME
iface, err := water.New(config)
var err error
iface, err = water.New(config)
if err != nil {
panic(err)
}
if err := exec.Command("ip", "addr", "add", "10.1.0.10/24", "dev", IFACE_NAME).Run(); err != nil {
if err := exec.Command("ip", "addr", "add", "10.1.0.2/24", "dev", IFACE_NAME).Run(); err != nil {
panic(err)
}
if err := exec.Command("ip", "link", "set", "dev", IFACE_NAME, "up").Run(); err != nil {
panic(err)
}
log.Println("Listening...")
go receivePackets()
sendPackets(iface)
}
func sendPackets(iface *water.Interface) {
var frame ethernet.Frame
for {
frame.Resize(1500)
n, err := iface.Read([]byte(frame))
if err != nil {
panic(err)
}
frame = frame[:n]
if frame.Destination()[0]&0x01 == 0x01 {
log.Println("multicast")
continue
}
log.Printf("Dst: %s\n", frame.Destination())
log.Printf("Src: %s\n", frame.Source())
log.Printf("Ethertype: % x\n", frame.Ethertype())
log.Printf("Payload: % x\n", frame.Payload())
}
receivePackets()
}
func receivePackets() {
log.Println("Listening for packets...")
listenAddr, err := net.ResolveUDPAddr("udp", ":38000")
if err != nil {
panic(err)
@@ -102,7 +81,7 @@ func receivePackets() {
}
}
func receivePacket(c *net.UDPConn, pkt []byte, addr *net.UDPAddr) {
func receivePacket(conn *net.UDPConn, pkt []byte, addr *net.UDPAddr) {
if len(pkt) < 4 {
log.Println("packet too short")
return
@@ -135,9 +114,12 @@ func receivePacket(c *net.UDPConn, pkt []byte, addr *net.UDPAddr) {
}
resp := shared.BuildPkt(shared.RESP_REGISTER, net.ParseIP(internalIP).To4())
if _, err := c.WriteToUDP(resp, addr); err != nil {
log.Printf("register WriteToUDP: %v\n", err)
if _, err := conn.WriteToUDP(resp, addr); err != nil {
log.Println(err)
}
case shared.REQ_DATA:
fmt.Println("received packet from " + peerIP + ":")
fmt.Println(hex.EncodeToString(pkt[4:]))
default:
log.Println("unknown packet type")
}