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58 lines
1.7 KiB
Markdown
58 lines
1.7 KiB
Markdown
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# go-multiaddr-dns
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> Resolve /dns4, /dns6, and /dnsaddr multiaddrs.
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```sh
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> madns /dnsaddr/ipfs.io/ipfs/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
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/ip4/104.236.151.122/tcp/4001/ipfs/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
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/ip6/2604:a880:1:20::1d9:6001/tcp/4001/ipfs/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
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/ip6/fc3d:9a4e:3c96:2fd2:1afa:18fe:8dd2:b602/tcp/4001/ipfs/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
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/dns4/jupiter.i.ipfs.io/tcp/4001/ipfs/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
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/dns6/jupiter.i.ipfs.io/tcp/4001/ipfs/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
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```
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In more detail:
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```sh
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> madns /dns6/example.net
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/ip6/2001:db8::a3
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/ip6/2001:db8::a4
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...
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> madns /dns4/example.net/tcp/443/wss
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/ip4/192.0.2.1/tcp/443/wss
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/ip4/192.0.2.2/tcp/443/wss
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# No-op if it's not a dns-ish address.
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> madns /ip4/127.0.0.1/tcp/8080
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/ip4/127.0.0.1/tcp/8080
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# /dnsaddr resolves by looking up TXT records.
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> dig +short TXT _dnsaddr.example.net
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"dnsaddr=/ip6/2001:db8::a3/tcp/443/wss/ipfs/Qmfoo"
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"dnsaddr=/ip6/2001:db8::a4/tcp/443/wss/ipfs/Qmbar"
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"dnsaddr=/ip4/192.0.2.1/tcp/443/wss/ipfs/Qmfoo"
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"dnsaddr=/ip4/192.0.2.2/tcp/443/wss/ipfs/Qmbar"
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...
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# /dnsaddr returns addrs which encapsulate whatever /dnsaddr encapsulates too.
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> madns example.net/ipfs/Qmfoo
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info: changing query to /dnsaddr/example.net/ipfs/Qmfoo
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/ip6/2001:db8::a3/tcp/443/wss/ipfs/Qmfoo
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/ip4/192.0.2.1/tcp/443/wss/ipfs/Qmfoo
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# TODO -p filters by protocol stacks.
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> madns -p /ip6/tcp/wss /dnsaddr/example.net
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/ip6/2001:db8::a3/tcp/443/wss/ipfs/Qmfoo
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/ip6/2001:db8::a4/tcp/443/wss/ipfs/Qmbar
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# TODO -c filters by CIDR
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> madns -c /ip4/104.236.76.0/ipcidr/24 /dnsaddr/example.net
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/ip4/192.0.2.2/tcp/443/wss/ipfs/Qmbar
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```
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