mirror of
https://github.com/juanfont/headscale.git
synced 2024-12-20 19:09:07 +01:00
feb15365b5
This is a massive commit that restructures the code into modules:
db/
All functions related to modifying the Database
types/
All type definitions and methods that can be exclusivly used on
these types without dependencies
policy/
All Policy related code, now without dependencies on the Database.
policy/matcher/
Dedicated code to match machines in a list of FilterRules
Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>
100 lines
2.2 KiB
Go
100 lines
2.2 KiB
Go
// Codehere is mostly taken from github.com/tailscale/tailscale
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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package db
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import (
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"errors"
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"fmt"
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"net/netip"
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"github.com/juanfont/headscale/hscontrol/types"
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"github.com/juanfont/headscale/hscontrol/util"
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"go4.org/netipx"
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)
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var ErrCouldNotAllocateIP = errors.New("could not find any suitable IP")
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func (hsdb *HSDatabase) getAvailableIPs() (types.MachineAddresses, error) {
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var ips types.MachineAddresses
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var err error
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for _, ipPrefix := range hsdb.ipPrefixes {
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var ip *netip.Addr
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ip, err = hsdb.getAvailableIP(ipPrefix)
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if err != nil {
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return ips, err
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}
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ips = append(ips, *ip)
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}
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return ips, err
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}
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func (hsdb *HSDatabase) getAvailableIP(ipPrefix netip.Prefix) (*netip.Addr, error) {
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usedIps, err := hsdb.getUsedIPs()
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if err != nil {
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return nil, err
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}
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ipPrefixNetworkAddress, ipPrefixBroadcastAddress := util.GetIPPrefixEndpoints(ipPrefix)
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// Get the first IP in our prefix
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ip := ipPrefixNetworkAddress.Next()
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for {
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if !ipPrefix.Contains(ip) {
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return nil, ErrCouldNotAllocateIP
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}
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switch {
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case ip.Compare(ipPrefixBroadcastAddress) == 0:
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fallthrough
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case usedIps.Contains(ip):
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fallthrough
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case ip == netip.Addr{} || ip.IsLoopback():
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ip = ip.Next()
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continue
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default:
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return &ip, nil
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}
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}
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}
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func (hsdb *HSDatabase) getUsedIPs() (*netipx.IPSet, error) {
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// FIXME: This really deserves a better data model,
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// but this was quick to get running and it should be enough
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// to begin experimenting with a dual stack tailnet.
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var addressesSlices []string
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hsdb.db.Model(&types.Machine{}).Pluck("ip_addresses", &addressesSlices)
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var ips netipx.IPSetBuilder
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for _, slice := range addressesSlices {
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var machineAddresses types.MachineAddresses
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err := machineAddresses.Scan(slice)
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if err != nil {
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return &netipx.IPSet{}, fmt.Errorf(
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"failed to read ip from database: %w",
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err,
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)
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}
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for _, ip := range machineAddresses {
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ips.Add(ip)
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}
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}
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ipSet, err := ips.IPSet()
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if err != nil {
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return &netipx.IPSet{}, fmt.Errorf(
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"failed to build IP Set: %w",
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err,
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)
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}
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return ipSet, nil
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}
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