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feature/*: make Wake-on-LAN conditional, start supporting modular features

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This pulls out the Wake-on-LAN (WoL) code out into its own package
(feature/wakeonlan) that registers itself with various new hooks
around tailscaled.

Then a new build tag (ts_omit_wakeonlan) causes the package to not
even be linked in the binary.

Ohter new packages include:

   * feature: to just record which features are loaded. Future:
     dependencies between features.
   * feature/condregister: the package with all the build tags
     that tailscaled, tsnet, and the Tailscale Xcode project
     extension can empty (underscore) import to load features
     as a function of the defined build tags.

Future commits will move of our "ts_omit_foo" build tags into this
style.

Updates #12614

Change-Id: I9c5378dafb1113b62b816aabef02714db3fc9c4a
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2025-01-22 11:56:36 -08:00
committed by Brad Fitzpatrick
parent 3fb8a1f6bf
commit 1562a6f2f2
18 changed files with 355 additions and 242 deletions
Download Patch File Download Diff File Expand all files Collapse all files

67
ipn/ipnlocal/c2n.go
View File

@@ -10,19 +10,16 @@ import (
"errors"
"fmt"
"io"
"net"
"net/http"
"os"
"os/exec"
"path"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
"time"
"github.com/kortschak/wol"
"tailscale.com/clientupdate"
"tailscale.com/envknob"
"tailscale.com/ipn"
@@ -66,9 +63,6 @@ var c2nHandlers = map[methodAndPath]c2nHandler{
req("GET /update"): handleC2NUpdateGet,
req("POST /update"): handleC2NUpdatePost,
// Wake-on-LAN.
req("POST /wol"): handleC2NWoL,
// Device posture.
req("GET /posture/identity"): handleC2NPostureIdentityGet,
@@ -82,6 +76,18 @@ var c2nHandlers = map[methodAndPath]c2nHandler{
req("GET /vip-services"): handleC2NVIPServicesGet,
}
// RegisterC2N registers a new c2n handler for the given pattern.
//
// A pattern is like "GET /foo" (specific to an HTTP method) or "/foo" (all
// methods). It panics if the pattern is already registered.
func RegisterC2N(pattern string, h func(*LocalBackend, http.ResponseWriter, *http.Request)) {
k := req(pattern)
if _, ok := c2nHandlers[k]; ok {
panic(fmt.Sprintf("c2n: duplicate handler for %q", pattern))
}
c2nHandlers[k] = h
}
type c2nHandler func(*LocalBackend, http.ResponseWriter, *http.Request)
type methodAndPath struct {
@@ -503,55 +509,6 @@ func regularFileExists(path string) bool {
return err == nil && fi.Mode().IsRegular()
}
func handleC2NWoL(b *LocalBackend, w http.ResponseWriter, r *http.Request) {
r.ParseForm()
var macs []net.HardwareAddr
for _, macStr := range r.Form["mac"] {
mac, err := net.ParseMAC(macStr)
if err != nil {
http.Error(w, "bad 'mac' param", http.StatusBadRequest)
return
}
macs = append(macs, mac)
}
var res struct {
SentTo []string
Errors []string
}
st := b.sys.NetMon.Get().InterfaceState()
if st == nil {
res.Errors = append(res.Errors, "no interface state")
writeJSON(w, &res)
return
}
var password []byte // TODO(bradfitz): support? does anything use WoL passwords?
for _, mac := range macs {
for ifName, ips := range st.InterfaceIPs {
for _, ip := range ips {
if ip.Addr().IsLoopback() || ip.Addr().Is6() {
continue
}
local := &net.UDPAddr{
IP: ip.Addr().AsSlice(),
Port: 0,
}
remote := &net.UDPAddr{
IP: net.IPv4bcast,
Port: 0,
}
if err := wol.Wake(mac, password, local, remote); err != nil {
res.Errors = append(res.Errors, err.Error())
} else {
res.SentTo = append(res.SentTo, ifName)
}
break // one per interface is enough
}
}
}
sort.Strings(res.SentTo)
writeJSON(w, &res)
}
// handleC2NTLSCertStatus returns info about the last TLS certificate issued for the
// provided domain. This can be called by the controlplane to clean up DNS TXT
// records when they're no longer needed by LetsEncrypt.