tailscale/ipn/ipnstate/ipnstate.go

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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package ipnstate captures the entire state of the Tailscale network.
//
// It's a leaf package so ipn, wgengine, and magicsock can all depend on it.
package ipnstate
import (
"fmt"
"html"
"io"
"log"
"net/netip"
"sort"
"strings"
"sync"
"time"
"tailscale.com/tailcfg"
"tailscale.com/types/key"
"tailscale.com/types/views"
"tailscale.com/util/dnsname"
)
// Status represents the entire state of the IPN network.
type Status struct {
// Version is the daemon's long version (see version.Long).
Version string
// BackendState is an ipn.State string value:
// "NoState", "NeedsLogin", "NeedsMachineAuth", "Stopped",
// "Starting", "Running".
BackendState string
AuthURL string // current URL provided by control to authorize client
TailscaleIPs []netip.Addr // Tailscale IP(s) assigned to this node
Self *PeerStatus
// ExitNodeStatus describes the current exit node.
// If nil, an exit node is not in use.
ExitNodeStatus *ExitNodeStatus `json:"ExitNodeStatus,omitempty"`
// Health contains health check problems.
// Empty means everything is good. (or at least that no known
// problems are detected)
Health []string
// This field is the legacy name of CurrentTailnet.MagicDNSSuffix.
//
// Deprecated: use CurrentTailnet.MagicDNSSuffix instead.
MagicDNSSuffix string
// CurrentTailnet is information about the tailnet that the node
// is currently connected to. When not connected, this field is nil.
CurrentTailnet *TailnetStatus
// CertDomains are the set of DNS names for which the control
// plane server will assist with provisioning TLS
// certificates. See SetDNSRequest for dns-01 ACME challenges
// for e.g. LetsEncrypt. These names are FQDNs without
// trailing periods, and without any "_acme-challenge." prefix.
CertDomains []string
Peer map[key.NodePublic]*PeerStatus
User map[tailcfg.UserID]tailcfg.UserProfile
}
// TailnetStatus is information about a Tailscale network ("tailnet").
type TailnetStatus struct {
// Name is the name of the network that's currently in use.
Name string
// MagicDNSSuffix is the network's MagicDNS suffix for nodes
// in the network such as "userfoo.tailscale.net".
// There are no surrounding dots.
// MagicDNSSuffix should be populated regardless of whether a domain
// has MagicDNS enabled.
MagicDNSSuffix string
// MagicDNSEnabled is whether or not the network has MagicDNS enabled.
// Note that the current device may still not support MagicDNS if
// `--accept-dns=false` was used.
MagicDNSEnabled bool
}
// ExitNodeStatus describes the current exit node.
type ExitNodeStatus struct {
// ID is the exit node's ID.
ID tailcfg.StableNodeID
// Online is whether the exit node is alive.
Online bool
// TailscaleIPs are the exit node's IP addresses assigned to the node.
TailscaleIPs []netip.Prefix
}
func (s *Status) Peers() []key.NodePublic {
kk := make([]key.NodePublic, 0, len(s.Peer))
for k := range s.Peer {
kk = append(kk, k)
}
sort.Slice(kk, func(i, j int) bool { return kk[i].Less(kk[j]) })
return kk
}
type PeerStatusLite struct {
// TxBytes/RxBytes is the total number of bytes transmitted to/received from this peer.
TxBytes, RxBytes int64
// LastHandshake is the last time a handshake succeeded with this peer.
// (Or we got key confirmation via the first data message,
// which is approximately the same thing.)
LastHandshake time.Time
// NodeKey is this peer's public node key.
NodeKey key.NodePublic
}
type PeerStatus struct {
ID tailcfg.StableNodeID
PublicKey key.NodePublic
HostName string // HostInfo's Hostname (not a DNS name or necessarily unique)
DNSName string
OS string // HostInfo.OS
UserID tailcfg.UserID
TailscaleIPs []netip.Addr // Tailscale IP(s) assigned to this node
// Tags are the list of ACL tags applied to this node.
// See tailscale.com/tailcfg#Node.Tags for more information.
Tags *views.Slice[string] `json:",omitempty"`
// PrimaryRoutes are the routes this node is currently the primary
// subnet router for, as determined by the control plane. It does
// not include the IPs in TailscaleIPs.
PrimaryRoutes *views.IPPrefixSlice `json:",omitempty"`
// Endpoints:
Addrs []string
CurAddr string // one of Addrs, or unique if roaming
Relay string // DERP region
RxBytes int64
TxBytes int64
Created time.Time // time registered with tailcontrol
LastWrite time.Time // time last packet sent
LastSeen time.Time // last seen to tailcontrol; only present if offline
LastHandshake time.Time // with local wireguard
Online bool // whether node is connected to the control plane
KeepAlive bool
ExitNode bool // true if this is the currently selected exit node.
ExitNodeOption bool // true if this node can be an exit node (offered && approved)
// Active is whether the node was recently active. The
// definition is somewhat undefined but has historically and
// currently means that there was some packet sent to this
// peer in the past two minutes. That definition is subject to
// change.
Active bool
PeerAPIURL []string
Capabilities []string `json:",omitempty"`
// SSH_HostKeys are the node's SSH host keys, if known.
SSH_HostKeys []string `json:"sshHostKeys,omitempty"`
// ShareeNode indicates this node exists in the netmap because
// it's owned by a shared-to user and that node might connect
// to us. These nodes should be hidden by "tailscale status"
// etc by default.
ShareeNode bool `json:",omitempty"`
// InNetworkMap means that this peer was seen in our latest network map.
// In theory, all of InNetworkMap and InMagicSock and InEngine should all be true.
InNetworkMap bool
// InMagicSock means that this peer is being tracked by magicsock.
// In theory, all of InNetworkMap and InMagicSock and InEngine should all be true.
InMagicSock bool
// InEngine means that this peer is tracked by the wireguard engine.
// In theory, all of InNetworkMap and InMagicSock and InEngine should all be true.
InEngine bool
}
type StatusBuilder struct {
mu sync.Mutex
locked bool
st Status
}
// MutateStatus calls f with the status to mutate.
//
// It may not assume other fields of status are already populated, and
// may not retain or write to the Status after f returns.
//
// MutateStatus acquires a lock so f must not call back into sb.
func (sb *StatusBuilder) MutateStatus(f func(*Status)) {
sb.mu.Lock()
defer sb.mu.Unlock()
f(&sb.st)
}
func (sb *StatusBuilder) Status() *Status {
sb.mu.Lock()
defer sb.mu.Unlock()
sb.locked = true
return &sb.st
}
// MutateSelfStatus calls f with the PeerStatus of our own node to mutate.
//
// It may not assume other fields of status are already populated, and
// may not retain or write to the Status after f returns.
//
// MutateStatus acquires a lock so f must not call back into sb.
func (sb *StatusBuilder) MutateSelfStatus(f func(*PeerStatus)) {
sb.mu.Lock()
defer sb.mu.Unlock()
if sb.st.Self == nil {
sb.st.Self = new(PeerStatus)
}
f(sb.st.Self)
}
// AddUser adds a user profile to the status.
func (sb *StatusBuilder) AddUser(id tailcfg.UserID, up tailcfg.UserProfile) {
sb.mu.Lock()
defer sb.mu.Unlock()
if sb.locked {
log.Printf("[unexpected] ipnstate: AddUser after Locked")
return
}
if sb.st.User == nil {
sb.st.User = make(map[tailcfg.UserID]tailcfg.UserProfile)
}
sb.st.User[id] = up
}
// AddIP adds a Tailscale IP address to the status.
func (sb *StatusBuilder) AddTailscaleIP(ip netip.Addr) {
sb.mu.Lock()
defer sb.mu.Unlock()
if sb.locked {
log.Printf("[unexpected] ipnstate: AddIP after Locked")
return
}
sb.st.TailscaleIPs = append(sb.st.TailscaleIPs, ip)
}
// AddPeer adds a peer node to the status.
//
// Its PeerStatus is mixed with any previous status already added.
func (sb *StatusBuilder) AddPeer(peer key.NodePublic, st *PeerStatus) {
if st == nil {
panic("nil PeerStatus")
}
sb.mu.Lock()
defer sb.mu.Unlock()
if sb.locked {
log.Printf("[unexpected] ipnstate: AddPeer after Locked")
return
}
if sb.st.Peer == nil {
sb.st.Peer = make(map[key.NodePublic]*PeerStatus)
}
e, ok := sb.st.Peer[peer]
if !ok {
sb.st.Peer[peer] = st
st.PublicKey = peer
return
}
if v := st.ID; v != "" {
e.ID = v
}
if v := st.HostName; v != "" {
e.HostName = v
}
if v := st.DNSName; v != "" {
e.DNSName = v
}
if v := st.Relay; v != "" {
e.Relay = v
}
if v := st.UserID; v != 0 {
e.UserID = v
}
if v := st.TailscaleIPs; v != nil {
e.TailscaleIPs = v
}
if v := st.PrimaryRoutes; v != nil && !v.IsNil() {
e.PrimaryRoutes = v
}
if v := st.Tags; v != nil && !v.IsNil() {
e.Tags = v
}
if v := st.OS; v != "" {
e.OS = st.OS
}
if v := st.SSH_HostKeys; v != nil {
e.SSH_HostKeys = v
}
if v := st.Addrs; v != nil {
e.Addrs = v
}
if v := st.CurAddr; v != "" {
e.CurAddr = v
}
if v := st.RxBytes; v != 0 {
e.RxBytes = v
}
if v := st.TxBytes; v != 0 {
e.TxBytes = v
}
if v := st.LastHandshake; !v.IsZero() {
e.LastHandshake = v
}
if v := st.Created; !v.IsZero() {
e.Created = v
}
if v := st.LastSeen; !v.IsZero() {
e.LastSeen = v
}
if v := st.LastWrite; !v.IsZero() {
e.LastWrite = v
}
if st.Online {
e.Online = true
}
if st.InNetworkMap {
e.InNetworkMap = true
}
if st.InMagicSock {
e.InMagicSock = true
}
if st.InEngine {
e.InEngine = true
}
if st.KeepAlive {
e.KeepAlive = true
}
if st.ExitNode {
e.ExitNode = true
}
if st.ExitNodeOption {
e.ExitNodeOption = true
}
if st.ShareeNode {
e.ShareeNode = true
}
if st.Active {
e.Active = true
}
}
type StatusUpdater interface {
UpdateStatus(*StatusBuilder)
}
func (st *Status) WriteHTML(w io.Writer) {
f := func(format string, args ...any) { fmt.Fprintf(w, format, args...) }
f(`<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Tailscale State</title>
<style>
body { font-family: monospace; }
.owner { text-decoration: underline; }
.tailaddr { font-style: italic; }
.acenter { text-align: center; }
.aright { text-align: right; }
table, th, td { border: 1px solid black; border-spacing : 0; border-collapse : collapse; }
thead { background-color: #FFA500; }
th, td { padding: 5px; }
td { vertical-align: top; }
table tbody tr:nth-child(even) td { background-color: #f5f5f5; }
</style>
</head>
<body>
<h1>Tailscale State</h1>
`)
//f("<p><b>logid:</b> %s</p>\n", logid)
//f("<p><b>opts:</b> <code>%s</code></p>\n", html.EscapeString(fmt.Sprintf("%+v", opts)))
ips := make([]string, 0, len(st.TailscaleIPs))
for _, ip := range st.TailscaleIPs {
ips = append(ips, ip.String())
}
f("<p>Tailscale IP: %s", strings.Join(ips, ", "))
f("<table>\n<thead>\n")
f("<tr><th>Peer</th><th>OS</th><th>Node</th><th>Owner</th><th>Rx</th><th>Tx</th><th>Activity</th><th>Connection</th></tr>\n")
f("</thead>\n<tbody>\n")
now := time.Now()
var peers []*PeerStatus
for _, peer := range st.Peers() {
ps := st.Peer[peer]
if ps.ShareeNode {
continue
}
peers = append(peers, ps)
}
SortPeers(peers)
for _, ps := range peers {
var actAgo string
if !ps.LastWrite.IsZero() {
ago := now.Sub(ps.LastWrite)
actAgo = ago.Round(time.Second).String() + " ago"
if ago < 5*time.Minute {
actAgo = "<b>" + actAgo + "</b>"
}
}
var owner string
if up, ok := st.User[ps.UserID]; ok {
owner = up.LoginName
if i := strings.Index(owner, "@"); i != -1 {
owner = owner[:i]
}
}
hostName := dnsname.SanitizeHostname(ps.HostName)
dnsName := dnsname.TrimSuffix(ps.DNSName, st.MagicDNSSuffix)
if strings.EqualFold(dnsName, hostName) || ps.UserID != st.Self.UserID {
hostName = ""
}
var hostNameHTML string
if hostName != "" {
hostNameHTML = "<br>" + html.EscapeString(hostName)
}
var tailAddr string
if len(ps.TailscaleIPs) > 0 {
tailAddr = ps.TailscaleIPs[0].String()
}
f("<tr><td>%s</td><td class=acenter>%s</td>"+
"<td><b>%s</b>%s<div class=\"tailaddr\">%s</div></td><td class=\"acenter owner\">%s</td><td class=\"aright\">%v</td><td class=\"aright\">%v</td><td class=\"aright\">%v</td>",
ps.PublicKey.ShortString(),
osEmoji(ps.OS),
html.EscapeString(dnsName),
hostNameHTML,
tailAddr,
html.EscapeString(owner),
ps.RxBytes,
ps.TxBytes,
actAgo,
)
f("<td>")
if ps.Active {
if ps.Relay != "" && ps.CurAddr == "" {
f("relay <b>%s</b>", html.EscapeString(ps.Relay))
} else if ps.CurAddr != "" {
f("direct <b>%s</b>", html.EscapeString(ps.CurAddr))
}
}
f("</td>") // end Addrs
f("</tr>\n")
}
f("</tbody>\n</table>\n")
f("</body>\n</html>\n")
}
func osEmoji(os string) string {
switch os {
case "linux":
return "🐧"
case "macOS":
return "🍎"
case "windows":
return "🖥️"
case "iOS":
return "📱"
case "android":
return "🤖"
case "freebsd":
return "👿"
case "openbsd":
return "🐡"
}
return "👽"
}
// PingResult contains response information for the "tailscale ping" subcommand,
// saying how Tailscale can reach a Tailscale IP or subnet-routed IP.
// See tailcfg.PingResponse for a related response that is sent back to control
// for remote diagnostic pings.
type PingResult struct {
IP string // ping destination
NodeIP string // Tailscale IP of node handling IP (different for subnet routers)
NodeName string // DNS name base or (possibly not unique) hostname
Err string
LatencySeconds float64
// Endpoint is the ip:port if direct UDP was used.
// It is not currently set for TSMP pings.
Endpoint string
// DERPRegionID is non-zero DERP region ID if DERP was used.
// It is not currently set for TSMP pings.
DERPRegionID int
// DERPRegionCode is the three-letter region code
// corresponding to DERPRegionID.
// It is not currently set for TSMP pings.
DERPRegionCode string
// PeerAPIPort is set by TSMP ping responses for peers that
// are running a peerapi server. This is the port they're
// running the server on.
PeerAPIPort uint16 `json:",omitempty"`
// PeerAPIURL is the URL that was hit for pings of type "peerapi" (tailcfg.PingPeerAPI).
// It's of the form "http://ip:port" (or [ip]:port for IPv6).
PeerAPIURL string `json:",omitempty"`
// IsLocalIP is whether the ping request error is due to it being
// a ping to the local node.
IsLocalIP bool `json:",omitempty"`
// TODO(bradfitz): details like whether port mapping was used on either side? (Once supported)
}
func (pr *PingResult) ToPingResponse(pingType tailcfg.PingType) *tailcfg.PingResponse {
return &tailcfg.PingResponse{
Type: pingType,
IP: pr.IP,
NodeIP: pr.NodeIP,
NodeName: pr.NodeName,
Err: pr.Err,
LatencySeconds: pr.LatencySeconds,
Endpoint: pr.Endpoint,
DERPRegionID: pr.DERPRegionID,
DERPRegionCode: pr.DERPRegionCode,
PeerAPIPort: pr.PeerAPIPort,
IsLocalIP: pr.IsLocalIP,
}
}
func SortPeers(peers []*PeerStatus) {
sort.Slice(peers, func(i, j int) bool { return sortKey(peers[i]) < sortKey(peers[j]) })
}
func sortKey(ps *PeerStatus) string {
if ps.DNSName != "" {
return ps.DNSName
}
if ps.HostName != "" {
return ps.HostName
}
// TODO(bradfitz): add PeerStatus.Less and avoid these allocs in a Less func.
if len(ps.TailscaleIPs) > 0 {
return ps.TailscaleIPs[0].String()
}
raw := ps.PublicKey.Raw32()
return string(raw[:])
}