109 lines
3.3 KiB
Go
109 lines
3.3 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package wgint provides somewhat shady access to wireguard-go
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// internals that don't (yet) have public APIs.
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package wgint
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import (
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"reflect"
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"sync/atomic"
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"time"
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"unsafe"
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"github.com/tailscale/wireguard-go/device"
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)
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var (
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offHandshake = getPeerStatsOffset("lastHandshakeNano")
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offRxBytes = getPeerStatsOffset("rxBytes")
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offTxBytes = getPeerStatsOffset("txBytes")
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offHandshakeAttempts = getPeerHandshakeAttemptsOffset()
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)
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func getPeerStatsOffset(name string) uintptr {
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peerType := reflect.TypeFor[device.Peer]()
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field, ok := peerType.FieldByName(name)
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if !ok {
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panic("no " + name + " field in device.Peer")
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}
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if s := field.Type.String(); s != "atomic.Int64" && s != "atomic.Uint64" {
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panic("unexpected type " + s + " of field " + name + " in device.Peer")
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}
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return field.Offset
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}
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func getPeerHandshakeAttemptsOffset() uintptr {
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peerType := reflect.TypeFor[device.Peer]()
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field, ok := peerType.FieldByName("timers")
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if !ok {
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panic("no timers field in device.Peer")
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}
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field2, ok := field.Type.FieldByName("handshakeAttempts")
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if !ok {
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panic("no handshakeAttempts field in device.Peer.timers")
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}
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if g, w := field2.Type.String(), "atomic.Uint32"; g != w {
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panic("unexpected type " + g + " of field handshakeAttempts in device.Peer.timers; want " + w)
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}
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return field.Offset + field2.Offset
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}
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// peerLastHandshakeNano returns the last handshake time in nanoseconds since the
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// unix epoch.
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func peerLastHandshakeNano(peer *device.Peer) int64 {
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return (*atomic.Int64)(unsafe.Add(unsafe.Pointer(peer), offHandshake)).Load()
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}
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// peerRxBytes returns the number of bytes received from this peer.
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func peerRxBytes(peer *device.Peer) uint64 {
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return (*atomic.Uint64)(unsafe.Add(unsafe.Pointer(peer), offRxBytes)).Load()
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}
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// peerTxBytes returns the number of bytes sent to this peer.
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func peerTxBytes(peer *device.Peer) uint64 {
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return (*atomic.Uint64)(unsafe.Add(unsafe.Pointer(peer), offTxBytes)).Load()
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}
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// peerHandshakeAttempts returns the number of WireGuard handshake attempts
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// made for the current handshake. It resets to zero before every new handshake.
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func peerHandshakeAttempts(peer *device.Peer) uint32 {
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return (*atomic.Uint32)(unsafe.Add(unsafe.Pointer(peer), offHandshakeAttempts)).Load()
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}
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// Peer is a wrapper around a wireguard-go device.Peer pointer.
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type Peer struct {
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p *device.Peer
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}
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// PeerOf returns a Peer wrapper around a wireguard-go device.Peer.
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func PeerOf(p *device.Peer) Peer {
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return Peer{p}
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}
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// LastHandshake returns the last handshake time.
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//
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// If the handshake has never happened, it returns the zero value.
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func (p Peer) LastHandshake() time.Time {
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if n := peerLastHandshakeNano(p.p); n != 0 {
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return time.Unix(0, n)
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}
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return time.Time{}
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}
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func (p Peer) IsValid() bool { return p.p != nil }
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// TxBytes returns the number of bytes sent to this peer.
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func (p Peer) TxBytes() uint64 { return peerTxBytes(p.p) }
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// RxBytes returns the number of bytes received from this peer.
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func (p Peer) RxBytes() uint64 { return peerRxBytes(p.p) }
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// HandshakeAttempts returns the number of failed WireGuard handshake attempts
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// made for the current handshake. It resets to zero before every new handshake
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// and after a successful handshake.
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func (p Peer) HandshakeAttempts() uint32 {
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return peerHandshakeAttempts(p.p)
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}
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