overflow_discovery/discovery/ipv4/service_udp.go

package ipv4

import (
	"fmt"

	cnsm "git.loafle.net/commons_go/network_service_matcher"
	cuej "git.loafle.net/commons_go/util/encoding/json"
	discoveryM "git.loafle.net/overflow/overflow_commons_go/modules/discovery/model"
	"git.loafle.net/overflow/overflow_discovery/matcher"
)

func scanServiceUDP(port *discoveryM.Port, ds *discoveryM.DiscoveryService, 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 := cnsm.NewMatchInfo(port.Host.IP, portNumber)

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

		if m.Match(mi, 0, p) {
			s := &discoveryM.Service{
				ServiceName: m.ServiceName(),
			}
			s.Port = port
			resultChan <- s
			return true
		}
	}

	return false
}