forked from firedancer-io/radiance
/
sniff.go
116 lines (100 loc) · 2.65 KB
/
sniff.go
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package main
import (
"context"
"flag"
"fmt"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/pcap"
"go.firedancer.io/radiance/pkg/endpoints"
"go.firedancer.io/radiance/pkg/netlink"
"go.firedancer.io/radiance/pkg/tpu"
"k8s.io/klog/v2"
"net"
"strconv"
"strings"
)
type packet struct {
data []byte
port uint16
src net.IP
}
func readPacketsFromInterface(iface string, ports []uint16, dst net.IP) (chan packet, error) {
// bpf filter
var filter string
for _, port := range ports {
filter += fmt.Sprintf(" or dst port %d", port)
}
filter = fmt.Sprintf("udp and dst host %s and (%s)", dst.String(), filter[4:])
klog.Info("filter: ", filter)
handle, err := pcap.OpenLive(iface, 1600, false, pcap.BlockForever)
if err != nil {
return nil, err
}
// set filter
err = handle.SetBPFFilter(filter)
if err != nil {
return nil, err
}
packets := make(chan packet)
go func() {
defer close(packets)
packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
for p := range packetSource.Packets() {
udpLayer := p.Layer(layers.LayerTypeUDP)
if udpLayer == nil {
continue
}
packets <- packet{
data: udpLayer.(*layers.UDP).Payload,
port: uint16(udpLayer.(*layers.UDP).DstPort),
}
}
}()
return packets, nil
}
var (
flagIface = flag.String("iface", "", "interface to read packets from")
flagPorts = flag.String("ports", "", "destination ports to sniff (comma-separated), asks local RPC if empty")
)
func main() {
flag.Parse()
if *flagIface == "" {
klog.Exit("-iface is required")
}
dst, err := netlink.GetInterfaceIP(*flagIface)
if err != nil {
klog.Exit("failed to get IP: ", err)
}
klog.Infof("interface %s has primary IP %s", *flagIface, dst)
ports := make([]uint16, 0)
if *flagPorts == "" {
klog.Infof("no ports specified, asking local RPC for ports")
ports, err = endpoints.GetNodeTPUPorts(context.Background(), endpoints.RPCLocalhost, dst)
if err != nil {
klog.Exit("failed to get ports: ", err)
}
klog.Infof("found ports: %v", ports)
} else {
for _, port := range strings.Split(*flagPorts, ",") {
p, err := strconv.ParseUint(port, 10, 16)
if err != nil {
klog.Exit("failed to parse port: ", err)
}
ports = append(ports, uint16(p))
}
}
packets, err := readPacketsFromInterface(*flagIface, ports, dst)
if err != nil {
klog.Exit("error reading packets: ", err)
}
for p := range packets {
tx, err := tpu.ParseTx(p.data)
if err != nil {
klog.Warning("port %d error parsing tx: ", p.port, err)
continue
}
signers := tpu.ExtractSigners(tx)
klog.Infof("port %d sig %s signers %v", p.port, tx.Signatures[0], signers)
}
}