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client/tailscale, cmd/tailscale/cli: move version mismatch check to CLI

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So people can use the package for whois checks etc without version
skew errors.

The earlier change faa891c1f2 for #1905
was a bit too aggressive.

Fixes #2757

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-08-31 15:21:27 -07:00
parent 8744394cde
commit 3c8ca4b357
2 changed files with 19 additions and 3 deletions
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14
client/tailscale/tailscale.go
View File

@ -17,7 +17,6 @@
"net"
"net/http"
"net/url"
"os"
"strconv"
"strings"
"time"
@ -86,6 +85,15 @@ func bestError(err error, body []byte) error {
return err
}
var onVersionMismatch func(clientVer, serverVer string)
// SetVersionMismatchHandler sets f as the version mismatch handler
// to be called when the client (the current process) has a version
// number that doesn't match the server's declared version.
func SetVersionMismatchHandler(f func(clientVer, serverVer string)) {
onVersionMismatch = f
}
func send(ctx context.Context, method, path string, wantStatus int, body io.Reader) ([]byte, error) {
req, err := http.NewRequestWithContext(ctx, method, "http://local-tailscaled.sock"+path, body)
if err != nil {
@ -96,8 +104,8 @@ func send(ctx context.Context, method, path string, wantStatus int, body io.Read
return nil, err
}
defer res.Body.Close()
if server := res.Header.Get("Tailscale-Version"); server != version.Long {
fmt.Fprintf(os.Stderr, "Warning: client version %q != tailscaled server version %q\n", version.Long, server)
if server := res.Header.Get("Tailscale-Version"); server != "" && server != version.Long && onVersionMismatch != nil {
onVersionMismatch(version.Long, server)
}
slurp, err := ioutil.ReadAll(res.Body)
if err != nil {

8
cmd/tailscale/cli/cli.go
View File

@ -19,6 +19,7 @@
"runtime"
"strconv"
"strings"
"sync"
"syscall"
"text/tabwriter"
@ -82,6 +83,13 @@ func Run(args []string) error {
args = []string{"version"}
}
var warnOnce sync.Once
tailscale.SetVersionMismatchHandler(func(clientVer, serverVer string) {
warnOnce.Do(func() {
fmt.Fprintf(os.Stderr, "Warning: client version %q != tailscaled server version %q\n", clientVer, serverVer)
})
})
rootfs := flag.NewFlagSet("tailscale", flag.ExitOnError)
rootfs.StringVar(&rootArgs.socket, "socket", paths.DefaultTailscaledSocket(), "path to tailscaled's unix socket")