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Merge pull request #168 from multiformats/resolve
move ResolveUnspecifiedAddress(es) and FilterAddrs here from libp2p/go-addr-util
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,83 @@ | ||
package manet | ||
|
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import ( | ||
"fmt" | ||
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ma "github.com/multiformats/go-multiaddr" | ||
) | ||
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// ResolveUnspecifiedAddress expands an unspecified ip addresses (/ip4/0.0.0.0, /ip6/::) to | ||
// use the known local interfaces. If ifaceAddr is nil, we request interface addresses | ||
// from the network stack. (this is so you can provide a cached value if resolving many addrs) | ||
func ResolveUnspecifiedAddress(resolve ma.Multiaddr, ifaceAddrs []ma.Multiaddr) ([]ma.Multiaddr, error) { | ||
// split address into its components | ||
split := ma.Split(resolve) | ||
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// if first component (ip) is not unspecified, use it as is. | ||
if !IsIPUnspecified(split[0]) { | ||
return []ma.Multiaddr{resolve}, nil | ||
} | ||
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out := make([]ma.Multiaddr, 0, len(ifaceAddrs)) | ||
for _, ia := range ifaceAddrs { | ||
// must match the first protocol to be resolve. | ||
if ia.Protocols()[0].Code != resolve.Protocols()[0].Code { | ||
continue | ||
} | ||
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split[0] = ia | ||
joined := ma.Join(split...) | ||
out = append(out, joined) | ||
} | ||
if len(out) < 1 { | ||
return nil, fmt.Errorf("failed to resolve: %s", resolve) | ||
} | ||
return out, nil | ||
} | ||
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// ResolveUnspecifiedAddresses expands unspecified ip addresses (/ip4/0.0.0.0, /ip6/::) to | ||
// use the known local interfaces. | ||
func ResolveUnspecifiedAddresses(unspecAddrs, ifaceAddrs []ma.Multiaddr) ([]ma.Multiaddr, error) { | ||
// todo optimize: only fetch these if we have a "any" addr. | ||
if len(ifaceAddrs) < 1 { | ||
var err error | ||
ifaceAddrs, err = interfaceAddresses() | ||
if err != nil { | ||
return nil, err | ||
} | ||
} | ||
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var outputAddrs []ma.Multiaddr | ||
for _, a := range unspecAddrs { | ||
// unspecified? | ||
resolved, err := ResolveUnspecifiedAddress(a, ifaceAddrs) | ||
if err != nil { | ||
continue // optimistic. if we can't resolve anything, we'll know at the bottom. | ||
} | ||
outputAddrs = append(outputAddrs, resolved...) | ||
} | ||
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if len(outputAddrs) < 1 { | ||
return nil, fmt.Errorf("failed to specify addrs: %s", unspecAddrs) | ||
} | ||
return outputAddrs, nil | ||
} | ||
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// interfaceAddresses returns a list of addresses associated with local machine | ||
// Note: we do not return link local addresses. IP loopback is ok, because we | ||
// may be connecting to other nodes in the same machine. | ||
func interfaceAddresses() ([]ma.Multiaddr, error) { | ||
maddrs, err := InterfaceMultiaddrs() | ||
if err != nil { | ||
return nil, err | ||
} | ||
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var out []ma.Multiaddr | ||
for _, a := range maddrs { | ||
if !IsIpv6LinkLocal(a) { | ||
continue | ||
} | ||
out = append(out, a) | ||
} | ||
return out, nil | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,75 @@ | ||
package manet | ||
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import ( | ||
"testing" | ||
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ma "github.com/multiformats/go-multiaddr" | ||
"github.com/stretchr/testify/require" | ||
) | ||
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func TestResolvingAddrs(t *testing.T) { | ||
unspec := []ma.Multiaddr{ | ||
newMultiaddr(t, "/ip4/0.0.0.0/tcp/1234"), | ||
newMultiaddr(t, "/ip4/1.2.3.4/tcp/1234"), | ||
newMultiaddr(t, "/ip6/::/tcp/1234"), | ||
newMultiaddr(t, "/ip6/::100/tcp/1234"), | ||
} | ||
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iface := []ma.Multiaddr{ | ||
newMultiaddr(t, "/ip4/127.0.0.1"), | ||
newMultiaddr(t, "/ip4/10.20.30.40"), | ||
newMultiaddr(t, "/ip6/::1"), | ||
newMultiaddr(t, "/ip6/::f"), | ||
} | ||
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spec := []ma.Multiaddr{ | ||
newMultiaddr(t, "/ip4/127.0.0.1/tcp/1234"), | ||
newMultiaddr(t, "/ip4/10.20.30.40/tcp/1234"), | ||
newMultiaddr(t, "/ip4/1.2.3.4/tcp/1234"), | ||
newMultiaddr(t, "/ip6/::1/tcp/1234"), | ||
newMultiaddr(t, "/ip6/::f/tcp/1234"), | ||
newMultiaddr(t, "/ip6/::100/tcp/1234"), | ||
} | ||
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actual, err := ResolveUnspecifiedAddresses(unspec, iface) | ||
require.NoError(t, err) | ||
require.Equal(t, actual, spec) | ||
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ip4u := []ma.Multiaddr{newMultiaddr(t, "/ip4/0.0.0.0")} | ||
ip4i := []ma.Multiaddr{newMultiaddr(t, "/ip4/1.2.3.4")} | ||
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ip6u := []ma.Multiaddr{newMultiaddr(t, "/ip6/::")} | ||
ip6i := []ma.Multiaddr{newMultiaddr(t, "/ip6/::1")} | ||
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if _, err := ResolveUnspecifiedAddress(ip4u[0], ip6i); err == nil { | ||
t.Fatal("should have failed") | ||
} | ||
if _, err := ResolveUnspecifiedAddress(ip6u[0], ip4i); err == nil { | ||
t.Fatal("should have failed") | ||
} | ||
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if _, err := ResolveUnspecifiedAddresses(ip6u, ip4i); err == nil { | ||
t.Fatal("should have failed") | ||
} | ||
if _, err := ResolveUnspecifiedAddresses(ip4u, ip6i); err == nil { | ||
t.Fatal("should have failed") | ||
} | ||
} | ||
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func TestAddrOverNonLocalIP(t *testing.T) { | ||
bad := []ma.Multiaddr{ | ||
newMultiaddr(t, "/ip6/fe80::1/tcp/1234"), // link local | ||
newMultiaddr(t, "/ip6/fe80::100/tcp/1234"), // link local | ||
} | ||
good := []ma.Multiaddr{ | ||
newMultiaddr(t, "/ip4/127.0.0.1/tcp/1234"), | ||
newMultiaddr(t, "/ip6/::1/tcp/1234"), | ||
newMultiaddr(t, "/ip4/1.2.3.4/udp/1234/utp"), | ||
} | ||
for _, addr := range bad { | ||
require.Falsef(t, IsIpv6LinkLocal(addr), "%s is a link local addr", addr) | ||
} | ||
for _, addr := range good { | ||
require.Truef(t, IsIpv6LinkLocal(addr), "%s is not a link local addr", addr) | ||
} | ||
} |