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feat: enhance network monitoring for UDP packets #463

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f9c107f
feat: enhance network monitoring for UDP packets
rohan-stepsecurity Nov 20, 2025
8211235
fix: consolidate UDP monitoring logging
rohan-stepsecurity Nov 20, 2025
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8 changes: 7 additions & 1 deletion netmon.go
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Original file line number Diff line number Diff line change
Expand Up @@ -71,13 +71,19 @@ func (netMonitor *NetworkMonitor) handlePacket(attrs nflog.Attribute) {
packet := gopacket.NewPacket(data, layers.LayerTypeIPv4, gopacket.Default)
port := ""
isSYN := false
isUDP := false
// Get the TCP layer from this packet
if tcpLayer := packet.Layer(layers.LayerTypeTCP); tcpLayer != nil {
// Get actual TCP data from this layer
tcp, _ := tcpLayer.(*layers.TCP)
port = tcp.DstPort.String()
isSYN = tcp.SYN

} else if udpLayer := packet.Layer(layers.LayerTypeUDP); udpLayer != nil {
// Get actual UDP data from this layer
udp, _ := udpLayer.(*layers.UDP)
port = udp.DstPort.String()
isUDP = true
}

// Get the IP layer from this packet
Expand All @@ -90,7 +96,7 @@ func (netMonitor *NetworkMonitor) handlePacket(attrs nflog.Attribute) {
if !found {
ipAddresses[ipv4Address] = 1

if isSYN {
if isSYN || isUDP {
if netMonitor.Status == "Dropped" {

netMonitor.ApiClient.sendNetConnection(netMonitor.CorrelationId, netMonitor.Repo,
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14 changes: 13 additions & 1 deletion procmon_linux.go
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Expand Up @@ -107,7 +107,19 @@ func (p *ProcessMonitor) MonitorProcesses(errc chan error) {
errc <- errors.Wrap(err, "failed to add audit rule for syscall connect")
}

WriteLog("Net monitor added")
WriteLog("Net monitor added for TCP (connect)")

// syscall sendto (for UDP)
r, _ = flags.Parse(fmt.Sprintf("-a exit,always -S sendto -S sendmsg -k %s", netMonitorTag))

actualBytes, _ = rule.Build(r)

if err = client.AddRule(actualBytes); err != nil {
WriteLog(fmt.Sprintf("failed to add audit rule for sendto %v", err))
errc <- errors.Wrap(err, "failed to add audit rule for syscall sendto")
}

WriteLog("Net monitor added for UDP (sendto & sendmsg)")

// syscall process start
r, _ = flags.Parse(fmt.Sprintf("-a exit,always -S execve -k %s", processMonitorTag))
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