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68 lines
1.9 KiB
68 lines
1.9 KiB
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package netutil
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import (
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"fmt"
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"math/rand"
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"net"
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"net/netip"
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)
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// AddrAddr gets the IP address contained in addr. The result will be invalid if the
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// address type is unsupported.
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func AddrAddr(addr net.Addr) netip.Addr {
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switch a := addr.(type) {
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case *net.IPAddr:
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return IPToAddr(a.IP)
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case *net.TCPAddr:
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return IPToAddr(a.IP)
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case *net.UDPAddr:
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return IPToAddr(a.IP)
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default:
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return netip.Addr{}
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}
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}
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// IPToAddr converts net.IP to netip.Addr. Note that unlike netip.AddrFromSlice, this
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// function will always ensure that the resulting Addr is IPv4 when the input is.
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func IPToAddr(ip net.IP) netip.Addr {
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if ip4 := ip.To4(); ip4 != nil {
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addr, _ := netip.AddrFromSlice(ip4)
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return addr
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} else if ip6 := ip.To16(); ip6 != nil {
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addr, _ := netip.AddrFromSlice(ip6)
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return addr
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}
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return netip.Addr{}
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}
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// RandomAddr creates a random IP address.
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func RandomAddr(rng *rand.Rand, ipv4 bool) netip.Addr {
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var bytes []byte
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if ipv4 || rng.Intn(2) == 0 {
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bytes = make([]byte, 4)
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} else {
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bytes = make([]byte, 16)
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}
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rng.Read(bytes)
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addr, ok := netip.AddrFromSlice(bytes)
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if !ok {
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panic(fmt.Errorf("BUG! invalid IP %v", bytes))
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}
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return addr
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}
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