mirror of
https://github.com/tailscale/tailscale.git
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126 lines
3.5 KiB
Go
126 lines
3.5 KiB
Go
// 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 nmcfg converts a controlclient.NetMap into a wgcfg config.
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package nmcfg
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import (
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"bytes"
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"fmt"
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"strings"
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"inet.af/netaddr"
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"tailscale.com/net/tsaddr"
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"tailscale.com/tailcfg"
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"tailscale.com/types/logger"
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"tailscale.com/types/netmap"
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"tailscale.com/wgengine/wgcfg"
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)
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func nodeDebugName(n *tailcfg.Node) string {
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name := n.Name
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if name == "" {
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name = n.Hostinfo.Hostname()
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}
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if i := strings.Index(name, "."); i != -1 {
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name = name[:i]
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}
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if name == "" && len(n.Addresses) != 0 {
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return n.Addresses[0].String()
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}
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return name
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}
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// cidrIsSubnet reports whether cidr is a non-default-route subnet
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// exported by node that is not one of its own self addresses.
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func cidrIsSubnet(node *tailcfg.Node, cidr netaddr.IPPrefix) bool {
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if cidr.Bits() == 0 {
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return false
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}
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if !cidr.IsSingleIP() {
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return true
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}
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for _, selfCIDR := range node.Addresses {
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if cidr == selfCIDR {
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return false
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}
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}
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return true
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}
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// WGCfg returns the NetworkMaps's Wireguard configuration.
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func WGCfg(nm *netmap.NetworkMap, logf logger.Logf, flags netmap.WGConfigFlags, exitNode tailcfg.StableNodeID) (*wgcfg.Config, error) {
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cfg := &wgcfg.Config{
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Name: "tailscale",
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PrivateKey: nm.PrivateKey,
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Addresses: nm.Addresses,
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Peers: make([]wgcfg.Peer, 0, len(nm.Peers)),
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}
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// Logging buffers
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skippedUnselected := new(bytes.Buffer)
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skippedIPs := new(bytes.Buffer)
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skippedSubnets := new(bytes.Buffer)
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for _, peer := range nm.Peers {
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if peer.DiscoKey.IsZero() && peer.DERP == "" {
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// Peer predates both DERP and active discovery, we cannot
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// communicate with it.
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logf("[v1] wgcfg: skipped peer %s, doesn't offer DERP or disco", peer.Key.ShortString())
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continue
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}
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cfg.Peers = append(cfg.Peers, wgcfg.Peer{
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PublicKey: peer.Key,
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DiscoKey: peer.DiscoKey,
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})
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cpeer := &cfg.Peers[len(cfg.Peers)-1]
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if peer.KeepAlive {
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cpeer.PersistentKeepalive = 25 // seconds
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}
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didExitNodeWarn := false
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for _, allowedIP := range peer.AllowedIPs {
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if allowedIP.Bits() == 0 && peer.StableID != exitNode {
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if didExitNodeWarn {
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// Don't log about both the IPv4 /0 and IPv6 /0.
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continue
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}
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didExitNodeWarn = true
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if skippedUnselected.Len() > 0 {
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skippedUnselected.WriteString(", ")
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}
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fmt.Fprintf(skippedUnselected, "%q (%v)", nodeDebugName(peer), peer.Key.ShortString())
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continue
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} else if allowedIP.IsSingleIP() && tsaddr.IsTailscaleIP(allowedIP.IP()) && (flags&netmap.AllowSingleHosts) == 0 {
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if skippedIPs.Len() > 0 {
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skippedIPs.WriteString(", ")
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}
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fmt.Fprintf(skippedIPs, "%v from %q (%v)", allowedIP.IP(), nodeDebugName(peer), peer.Key.ShortString())
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continue
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} else if cidrIsSubnet(peer, allowedIP) {
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if (flags & netmap.AllowSubnetRoutes) == 0 {
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if skippedSubnets.Len() > 0 {
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skippedSubnets.WriteString(", ")
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}
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fmt.Fprintf(skippedSubnets, "%v from %q (%v)", allowedIP, nodeDebugName(peer), peer.Key.ShortString())
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continue
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}
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}
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cpeer.AllowedIPs = append(cpeer.AllowedIPs, allowedIP)
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}
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}
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if skippedUnselected.Len() > 0 {
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logf("[v1] wgcfg: skipped unselected default routes from: %s", skippedUnselected.Bytes())
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}
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if skippedIPs.Len() > 0 {
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logf("[v1] wgcfg: skipped node IPs: %s", skippedIPs)
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}
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if skippedSubnets.Len() > 0 {
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logf("[v1] wgcfg: did not accept subnet routes: %s", skippedSubnets)
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}
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return cfg, nil
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}
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