Beispiel #1
0
func pickLocalAddr(laddrs []ma.Multiaddr, raddr ma.Multiaddr) (laddr ma.Multiaddr) {
	if len(laddrs) < 1 {
		return nil
	}

	// make sure that we ONLY use local addrs that match the remote addr.
	laddrs = manet.AddrMatch(raddr, laddrs)
	if len(laddrs) < 1 {
		return nil
	}

	// make sure that we ONLY use local addrs that CAN dial the remote addr.
	// filter out all the local addrs that aren't capable
	raddrIPLayer := ma.Split(raddr)[0]
	raddrIsLoopback := manet.IsIPLoopback(raddrIPLayer)
	raddrIsLinkLocal := manet.IsIP6LinkLocal(raddrIPLayer)
	laddrs = addrutil.FilterAddrs(laddrs, func(a ma.Multiaddr) bool {
		laddrIPLayer := ma.Split(a)[0]
		laddrIsLoopback := manet.IsIPLoopback(laddrIPLayer)
		laddrIsLinkLocal := manet.IsIP6LinkLocal(laddrIPLayer)
		if laddrIsLoopback { // our loopback addrs can only dial loopbacks.
			return raddrIsLoopback
		}
		if laddrIsLinkLocal {
			return raddrIsLinkLocal // out linklocal addrs can only dial link locals.
		}
		return true
	})

	// TODO pick with a good heuristic
	// we use a random one for now to prevent bad addresses from making nodes unreachable
	// with a random selection, multiple tries may work.
	return laddrs[rand.Intn(len(laddrs))]
}
Beispiel #2
0
// AddrIsShareableOnWAN returns whether the given address should be shareable on the
// wide area network (wide internet).
func AddrIsShareableOnWAN(addr ma.Multiaddr) bool {
	s := ma.Split(addr)
	if len(s) < 1 {
		return false
	}
	a := s[0]
	if manet.IsIPLoopback(a) || manet.IsIP6LinkLocal(a) || manet.IsIPUnspecified(a) {
		return false
	}
	return manet.IsThinWaist(a)
}
Beispiel #3
0
func (al AddrList) Less(i, j int) bool {
	a := al[i]
	b := al[j]

	// dial localhost addresses next, they should fail immediately
	lba := manet.IsIPLoopback(a)
	lbb := manet.IsIPLoopback(b)
	if lba {
		if !lbb {
			return true
		}
	}

	// dial utp and similar 'non-fd-consuming' addresses first
	fda := isFDCostlyTransport(a)
	fdb := isFDCostlyTransport(b)
	if !fda {
		if fdb {
			return true
		}

		// if neither consume fd's, assume equal ordering
		return false
	}

	// if 'b' doesnt take a file descriptor
	if !fdb {
		return false
	}

	// if 'b' is loopback and both take file descriptors
	if lbb {
		return false
	}

	// for the rest, just sort by bytes
	return bytes.Compare(a.Bytes(), b.Bytes()) > 0
}
Beispiel #4
0
func localAddresses() []ma.Multiaddr {
	maddrs, err := manet.InterfaceMultiaddrs()
	if err != nil {
		die(err)
	}

	if !hideLoopback {
		return maddrs
	}

	var maddrs2 []ma.Multiaddr
	for _, a := range maddrs {
		if !manet.IsIPLoopback(a) {
			maddrs2 = append(maddrs2, a)
		}
	}

	return maddrs2
}