probe/discoverer/ipv4/service_udp.go

package ipv4

import (
	"fmt"

	csm "git.loafle.net/commons/service_matcher-go"
	cuej "git.loafle.net/commons/util-go/encoding/json"
	omd "git.loafle.net/overflow/model/discovery"
	omm "git.loafle.net/overflow/model/meta"
	omu "git.loafle.net/overflow/model/util"
	"git.loafle.net/overflow_scanner/probe/matcher"
)

func scanServiceUDP(port *omd.Port, ds *omd.DiscoverService, resultChan chan interface{}, errChan chan error, stopChan chan struct{}) bool {
	portNumber, err := cuej.NumberToInt(port.PortNumber)
	if err != nil {
		errChan <- fmt.Errorf("Discovery: Service scan port[%s] error %v ", port.PortNumber, err)
		return false
	}

	ms := matcher.GetUDPMatchers()
	mi := csm.NewMatchInfo(port.Host.Address, portNumber)

	for i := 0; i < len(ms); i++ {
		m := ms[i]
		p := csm.NewPacket(port.UDPLayer.LayerPayload(), len(port.UDPLayer.LayerPayload()))

		if err := m.Match(mi, 0, p); err == nil {
			s := &omd.Service{
				Key:            m.Key(),
				Port:           port,
				MetaCryptoType: omm.ToMetaCryptoType(omm.MetaCryptoTypeEnumNONE),
				DiscoveredDate: omu.NowPtr(),
				Metadata:       m.Meta(),
				Name:           m.Name(),
			}

			resultChan <- s
			return true
		}
	}

	return false
}