88 lines
2.4 KiB
Go
88 lines
2.4 KiB
Go
package manet
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import (
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"fmt"
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ma "github.com/multiformats/go-multiaddr"
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)
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// ResolveUnspecifiedAddress expands an unspecified ip addresses (/ip4/0.0.0.0, /ip6/::) to
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// use the known local interfaces. If ifaceAddr is nil, we request interface addresses
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// from the network stack. (this is so you can provide a cached value if resolving many addrs)
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func ResolveUnspecifiedAddress(resolve ma.Multiaddr, ifaceAddrs []ma.Multiaddr) ([]ma.Multiaddr, error) {
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// split address into its components
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first, rest := ma.SplitFirst(resolve)
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// if first component (ip) is not unspecified, use it as is.
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if !IsIPUnspecified(first) {
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return []ma.Multiaddr{resolve}, nil
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}
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resolveProto := resolve.Protocols()[0].Code
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out := make([]ma.Multiaddr, 0, len(ifaceAddrs))
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for _, ia := range ifaceAddrs {
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iafirst, _ := ma.SplitFirst(ia)
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// must match the first protocol to be resolve.
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if iafirst.Protocol().Code != resolveProto {
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continue
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}
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joined := ia
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if rest != nil {
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joined = ma.Join(ia, rest)
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}
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out = append(out, joined)
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}
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if len(out) < 1 {
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return nil, fmt.Errorf("failed to resolve: %s", resolve)
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}
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return out, nil
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}
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// ResolveUnspecifiedAddresses expands unspecified ip addresses (/ip4/0.0.0.0, /ip6/::) to
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// use the known local interfaces.
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func ResolveUnspecifiedAddresses(unspecAddrs, ifaceAddrs []ma.Multiaddr) ([]ma.Multiaddr, error) {
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// todo optimize: only fetch these if we have a "any" addr.
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if len(ifaceAddrs) < 1 {
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var err error
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ifaceAddrs, err = interfaceAddresses()
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if err != nil {
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return nil, err
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}
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}
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var outputAddrs []ma.Multiaddr
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for _, a := range unspecAddrs {
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// unspecified?
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resolved, err := ResolveUnspecifiedAddress(a, ifaceAddrs)
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if err != nil {
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continue // optimistic. if we can't resolve anything, we'll know at the bottom.
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}
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outputAddrs = append(outputAddrs, resolved...)
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}
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if len(outputAddrs) < 1 {
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return nil, fmt.Errorf("failed to specify addrs: %s", unspecAddrs)
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}
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return outputAddrs, nil
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}
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// interfaceAddresses returns a list of addresses associated with local machine
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// Note: we do not return link local addresses. IP loopback is ok, because we
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// may be connecting to other nodes in the same machine.
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func interfaceAddresses() ([]ma.Multiaddr, error) {
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maddrs, err := InterfaceMultiaddrs()
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if err != nil {
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return nil, err
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}
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var out []ma.Multiaddr
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for _, a := range maddrs {
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if IsIP6LinkLocal(a) {
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continue
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}
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out = append(out, a)
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}
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return out, nil
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}
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