Daniel Redetzke
7391aac429
The server pings a peer's tunnel address every 30 s and shows the median of the last 5 minutes in the peer list (with a 1-hour sparkline) and a 24-hour chart on the peer page. Off by default; "active" pings only while the device sends traffic, "always" keeps the tunnel up.
108 lines
2.6 KiB
Go
108 lines
2.6 KiB
Go
//go:build !linux
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package main
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import (
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"fmt"
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"log/slog"
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"math/rand/v2"
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"net/netip"
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"sync"
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"time"
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)
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// simKernel stands in for the Linux kernel on other platforms. It does not
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// touch the system; it invents traffic for enabled peers so the web UI has
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// data during development.
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type simKernel struct {
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mu sync.Mutex
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peers map[string]*PeerSample
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}
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func newKernel() (Kernel, error) {
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slog.Warn("not running on Linux: using the traffic simulator, no WireGuard interface is created")
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return &simKernel{peers: map[string]*PeerSample{}}, nil
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}
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func (k *simKernel) Close() error { return nil }
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func (k *simKernel) Apply(c *Config) error {
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k.mu.Lock()
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defer k.mu.Unlock()
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keep := map[string]bool{}
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for i, p := range c.Peers {
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if !p.Enabled || !p.hasKey() {
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continue
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}
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keep[p.PublicKey] = true
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if k.peers[p.PublicKey] == nil {
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k.peers[p.PublicKey] = &PeerSample{
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PublicKey: p.PublicKey,
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Endpoint: fmt.Sprintf("198.51.100.%d:%d", 10+i, 40000+i*7),
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}
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}
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}
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for key := range k.peers {
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if !keep[key] {
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delete(k.peers, key)
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}
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}
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return nil
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}
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func (k *simKernel) Sample(string) ([]PeerSample, error) {
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k.mu.Lock()
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defer k.mu.Unlock()
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var out []PeerSample
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i := 0
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for _, p := range k.peers {
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// Every third peer stays idle; the others move some data.
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if i%3 != 2 {
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p.TxBytes += rand.Int64N(40 << 20)
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p.RxBytes += rand.Int64N(6 << 20)
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p.LastHandshake = time.Now().Add(-time.Duration(rand.IntN(90)) * time.Second)
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}
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out = append(out, *p)
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i++
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}
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return out, nil
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}
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func (k *simKernel) Checks(c *Config) []Check {
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return []Check{
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// Same wording as on Linux, so screenshots look like a real server.
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{"WireGuard interface", true, c.Server.Interface + " is up"},
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{"IPv4 forwarding", true, "net.ipv4.ip_forward=1"},
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{"nftables rules", true, "table inet " + appName + " present"},
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{"IPv4 uplink", true, "via eth0"},
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{"Public IPv4", true, "203.0.113.10"},
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}
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}
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func (k *simKernel) Uplink(c *Config, v6 bool) string {
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if v6 && c.Server.UplinkV6 != "" {
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return c.Server.UplinkV6
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}
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if !v6 && c.Server.UplinkV4 != "" {
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return c.Server.UplinkV4
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}
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return "eth0"
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}
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func (k *simKernel) Down(*Config) error { return nil }
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// Ping invents round trips from the address, so each peer keeps its own
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// typical latency. Every seventh address never answers, like a Windows PC.
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func (k *simKernel) Ping(dsts []netip.Addr, _ time.Duration) (map[netip.Addr]time.Duration, error) {
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out := map[netip.Addr]time.Duration{}
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for _, d := range dsts {
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last := int(d.As4()[3])
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if last%7 == 4 {
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continue
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}
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base := 8 + last*37%180
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out[d] = time.Duration(base*1000+rand.IntN(base*300+1)) * time.Microsecond
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}
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return out, nil
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}
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