Beispiel #1
0
func (p *Pinger) recvICMP(conn *net.IPConn, recv chan<- *packet, ctx *context, wg *sync.WaitGroup) {
	p.debugln("recvICMP(): Start")
	for {
		select {
		case <-ctx.stop:
			p.debugln("recvICMP(): <-ctx.stop")
			wg.Done()
			p.debugln("recvICMP(): wg.Done()")
			return
		default:
		}

		bytes := make([]byte, 512)
		conn.SetReadDeadline(time.Now().Add(time.Millisecond * 100))
		p.debugln("recvICMP(): ReadMsgIP Start")
		_, _, _, ra, err := conn.ReadMsgIP(bytes, nil)
		p.debugln("recvICMP(): ReadMsgIP End")
		if err != nil {
			if neterr, ok := err.(*net.OpError); ok {
				if neterr.Timeout() {
					p.debugln("recvICMP(): Read Timeout")
					continue
				} else {
					p.debugln("recvICMP(): OpError happen", err)
					p.mu.Lock()
					ctx.err = err
					p.mu.Unlock()
					p.debugln("recvICMP(): close(ctx.done)")
					close(ctx.done)
					p.debugln("recvICMP(): wg.Done()")
					wg.Done()
					return
				}
			}
		}
		p.debugln("recvICMP(): p.recv <- packet")

		select {
		case recv <- &packet{bytes: bytes, addr: ra}:
		case <-ctx.stop:
			p.debugln("recvICMP(): <-ctx.stop")
			wg.Done()
			p.debugln("recvICMP(): wg.Done()")
			return
		}
	}
}
Beispiel #2
0
func readOneICMP4Packet(conn *net.IPConn, deadline time.Time) (
	*icmpPacket, error,
) {
	for {
		conn.SetReadDeadline(deadline)
		bytes := make([]byte, 512)
		_, _, _, ra, err := conn.ReadMsgIP(bytes, nil)
		if err != nil {
			if neterr, ok := err.(*net.OpError); ok {
				if neterr.Timeout() {
					return nil, err
				} else {
					fmt.Println("readOneICMP4Packet(): OpError happen", err)
					return nil, err
				}
			}
		}
		fmt.Printf("ICMP: Got packet from %s.\n", ra.String())
		return &icmpPacket{bytes: bytes, addr: ra}, nil
	}
}