49 lines
1.5 KiB
Go
49 lines
1.5 KiB
Go
// Things borrowed from https://github.com/btcsuite/btcd/blob/master/addrmanager.go
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// because "github.com/btcsuite/btcd" wouldn't import for some reason.
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package main
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import (
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"encoding/base32"
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"github.com/btcsuite/btcd/wire"
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"net"
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"strconv"
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"strings"
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)
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var onioncatrange = net.IPNet{IP: net.ParseIP("FD87:d87e:eb43::"),
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Mask: net.CIDRMask(48, 128)}
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func Tor(na *wire.NetAddress) bool {
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// bitcoind encodes a .onion address as a 16 byte number by decoding the
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// address prior to the .onion (i.e. the key hash) base32 into a ten
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// byte number. it then stores the first 6 bytes of the address as
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// 0xfD, 0x87, 0xD8, 0x7e, 0xeb, 0x43
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// this is the same range used by onioncat, part of the
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// RFC4193 Unique local IPv6 range.
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// In summary the format is:
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// { magic 6 bytes, 10 bytes base32 decode of key hash }
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return onioncatrange.Contains(na.IP)
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}
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// ipString returns a string for the ip from the provided NetAddress. If the
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// ip is in the range used for tor addresses then it will be transformed into
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// the relavent .onion address.
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func ipString(na *wire.NetAddress) string {
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if Tor(na) {
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// We know now that na.IP is long enogh.
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base32 := base32.StdEncoding.EncodeToString(na.IP[6:])
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return strings.ToLower(base32) + ".onion"
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} else {
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return na.IP.String()
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}
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}
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// NetAddressKey returns a string key in the form of ip:port for IPv4 addresses
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// or [ip]:port for IPv6 addresses.
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func NetAddressKey(na *wire.NetAddress) string {
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port := strconv.FormatUint(uint64(na.Port), 10)
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addr := net.JoinHostPort(ipString(na), port)
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return addr
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}
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