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cmd/tailscaled: respect $PORT on all platforms, not just Linux

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Updates #5114

Change-Id: I6c6e28c493d6a026a03088157d08f9fd182ef373
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-09-17 09:24:26 -07:00 committed by Brad Fitzpatrick
parent 3562b5bdfa
commit 41bb47de0e
1 changed files with 16 additions and 1 deletions
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17
cmd/tailscaled/tailscaled.go
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@ -26,6 +26,7 @@
"os/signal"
"path/filepath"
"runtime"
"strconv"
"strings"
"syscall"
"time"
@ -97,6 +98,20 @@ func defaultTunName() string {
return "tailscale0"
}
// defaultPort returns the default UDP port to listen on for disco+wireguard.
// By default it returns 0, to pick one randomly from the kernel.
// If the environment variable PORT is set, that's used instead.
// The PORT environment variable is chosen to match what the Linux systemd
// unit uses, to make documentation more consistent.
func defaultPort() uint16 {
if s := envknob.String("PORT"); s != "" {
if p, err := strconv.ParseUint(s, 10, 16); err == nil {
return uint16(p)
}
}
return 0
}
var args struct {
// tunname is a /dev/net/tun tunnel name ("tailscale0"), the
// string "userspace-networking", "tap:TAPNAME[:BRIDGENAME]"
@ -142,7 +157,7 @@ func main() {
flag.StringVar(&args.socksAddr, "socks5-server", "", `optional [ip]:port to run a SOCK5 server (e.g. "localhost:1080")`)
flag.StringVar(&args.httpProxyAddr, "outbound-http-proxy-listen", "", `optional [ip]:port to run an outbound HTTP proxy (e.g. "localhost:8080")`)
flag.StringVar(&args.tunname, "tun", defaultTunName(), `tunnel interface name; use "userspace-networking" (beta) to not use TUN`)
flag.Var(flagtype.PortValue(&args.port, 0), "port", "UDP port to listen on for WireGuard and peer-to-peer traffic; 0 means automatically select")
flag.Var(flagtype.PortValue(&args.port, defaultPort()), "port", "UDP port to listen on for WireGuard and peer-to-peer traffic; 0 means automatically select")
flag.StringVar(&args.statepath, "state", "", "absolute path of state file; use 'kube:<secret-name>' to use Kubernetes secrets or 'arn:aws:ssm:...' to store in AWS SSM; use 'mem:' to not store state and register as an emphemeral node. If empty and --statedir is provided, the default is <statedir>/tailscaled.state. Default: "+paths.DefaultTailscaledStateFile())
flag.StringVar(&args.statedir, "statedir", "", "path to directory for storage of config state, TLS certs, temporary incoming Taildrop files, etc. If empty, it's derived from --state when possible.")
flag.StringVar(&args.socketpath, "socket", paths.DefaultTailscaledSocket(), "path of the service unix socket")