mirror of
https://github.com/MetaCubeX/mihomo.git
synced 2024-08-23 02:32:32 +00:00
54 lines
978 B
Go
54 lines
978 B
Go
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package nnip
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import (
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"encoding/binary"
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"net"
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"net/netip"
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)
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// IpToAddr converts the net.IP to netip.Addr.
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// If slice's length is not 4 or 16, IpToAddr returns netip.Addr{}
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func IpToAddr(slice net.IP) netip.Addr {
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ip := slice
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if len(ip) != 4 {
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if ip = slice.To4(); ip == nil {
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ip = slice
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}
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}
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if addr, ok := netip.AddrFromSlice(ip); ok {
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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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// UnMasked returns p's last IP address.
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// If p is invalid, UnMasked returns netip.Addr{}
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func UnMasked(p netip.Prefix) netip.Addr {
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if !p.IsValid() {
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return netip.Addr{}
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}
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buf := p.Addr().As16()
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hi := binary.BigEndian.Uint64(buf[:8])
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lo := binary.BigEndian.Uint64(buf[8:])
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bits := p.Bits()
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if bits <= 32 {
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bits += 96
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}
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hi = hi | ^uint64(0)>>bits
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lo = lo | ^(^uint64(0) << (128 - bits))
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binary.BigEndian.PutUint64(buf[:8], hi)
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binary.BigEndian.PutUint64(buf[8:], lo)
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addr := netip.AddrFrom16(buf)
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if p.Addr().Is4() {
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return addr.Unmap()
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}
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return addr
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}
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