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tail.go
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tail.go
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package mapper
import (
"fmt"
"net/netip"
"strconv"
"time"
"github.com/juanfont/headscale/hscontrol/policy"
"github.com/juanfont/headscale/hscontrol/types"
"github.com/juanfont/headscale/hscontrol/util"
"github.com/samber/lo"
"tailscale.com/tailcfg"
)
func tailNodes(
machines types.Machines,
pol *policy.ACLPolicy,
dnsConfig *tailcfg.DNSConfig,
baseDomain string,
) ([]*tailcfg.Node, error) {
nodes := make([]*tailcfg.Node, len(machines))
for index, machine := range machines {
node, err := tailNode(
machine,
pol,
dnsConfig,
baseDomain,
)
if err != nil {
return nil, err
}
nodes[index] = node
}
return nodes, nil
}
// tailNode converts a Machine into a Tailscale Node. includeRoutes is false for shared nodes
// as per the expected behaviour in the official SaaS.
func tailNode(
machine types.Machine,
pol *policy.ACLPolicy,
dnsConfig *tailcfg.DNSConfig,
baseDomain string,
) (*tailcfg.Node, error) {
nodeKey, err := machine.NodePublicKey()
if err != nil {
return nil, err
}
// MachineKey is only used in the legacy protocol
machineKey, err := machine.MachinePublicKey()
if err != nil {
return nil, err
}
discoKey, err := machine.DiscoPublicKey()
if err != nil {
return nil, err
}
addrs := machine.IPAddresses.Prefixes()
allowedIPs := append(
[]netip.Prefix{},
addrs...) // we append the node own IP, as it is required by the clients
primaryPrefixes := []netip.Prefix{}
for _, route := range machine.Routes {
if route.Enabled {
if route.IsPrimary {
allowedIPs = append(allowedIPs, netip.Prefix(route.Prefix))
primaryPrefixes = append(primaryPrefixes, netip.Prefix(route.Prefix))
} else if route.IsExitRoute() {
allowedIPs = append(allowedIPs, netip.Prefix(route.Prefix))
}
}
}
var derp string
if machine.HostInfo.NetInfo != nil {
derp = fmt.Sprintf("127.3.3.40:%d", machine.HostInfo.NetInfo.PreferredDERP)
} else {
derp = "127.3.3.40:0" // Zero means disconnected or unknown.
}
var keyExpiry time.Time
if machine.Expiry != nil {
keyExpiry = *machine.Expiry
} else {
keyExpiry = time.Time{}
}
hostname, err := machine.GetFQDN(dnsConfig, baseDomain)
if err != nil {
return nil, err
}
hostInfo := machine.GetHostInfo()
online := machine.IsOnline()
tags, _ := pol.TagsOfMachine(machine)
tags = lo.Uniq(append(tags, machine.ForcedTags...))
node := tailcfg.Node{
ID: tailcfg.NodeID(machine.ID), // this is the actual ID
StableID: tailcfg.StableNodeID(
strconv.FormatUint(machine.ID, util.Base10),
), // in headscale, unlike tailcontrol server, IDs are permanent
Name: hostname,
User: tailcfg.UserID(machine.UserID),
Key: nodeKey,
KeyExpiry: keyExpiry,
Machine: machineKey,
DiscoKey: discoKey,
Addresses: addrs,
AllowedIPs: allowedIPs,
Endpoints: machine.Endpoints,
DERP: derp,
Hostinfo: hostInfo.View(),
Created: machine.CreatedAt,
Tags: tags,
PrimaryRoutes: primaryPrefixes,
LastSeen: machine.LastSeen,
Online: &online,
KeepAlive: true,
MachineAuthorized: !machine.IsExpired(),
Capabilities: []string{
tailcfg.CapabilityFileSharing,
tailcfg.CapabilityAdmin,
tailcfg.CapabilitySSH,
},
}
return &node, nil
}