59 lines
1.5 KiB
Go
59 lines
1.5 KiB
Go
// Linsk - A utility to access Linux-native file systems on non-Linux operating systems.
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// Copyright (c) 2023 The Linsk Authors.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU 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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// This program 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package nettap
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import (
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"crypto/rand"
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"fmt"
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"net"
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"github.com/pkg/errors"
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)
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type TapNet struct {
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HostIP net.IP
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GuestIP net.IP
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HostCIDR string
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GuestCIDR string
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}
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func GenerateNet() (TapNet, error) {
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// This is a Linsk internal network IPv6 prefix.
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hostIP := []byte(net.ParseIP("fe8f:5980:3253:7df4:0f4b:6db1::"))
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_, err := rand.Read(hostIP[len(hostIP)-4:])
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if err != nil {
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return TapNet{}, errors.Wrap(err, "random read")
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}
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// Put the last bit to zero.
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hostIP[len(hostIP)-1] &= 0xfe
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guestIP := make([]byte, len(hostIP))
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copy(guestIP, hostIP)
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// Put the last bit to one.
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guestIP[len(hostIP)-1] |= 0x1
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return TapNet{
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HostIP: hostIP,
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GuestIP: guestIP,
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HostCIDR: fmt.Sprintf("%v/127", net.IP(hostIP)),
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GuestCIDR: fmt.Sprintf("%v/127", net.IP(guestIP)),
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}, nil
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}
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