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control/controlclient: add some temporary debugging for #839

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This commit is contained in:
Brad Fitzpatrick 2020-10-20 13:47:58 -07:00
parent 9957c45995
commit c44e244276
1 changed files with 39 additions and 0 deletions
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39
control/controlclient/direct.go
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@ -18,6 +18,7 @@
"io"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"os"
@ -28,6 +29,7 @@
"strings"
"sync"
"sync/atomic"
"syscall"
"time"
"github.com/tailscale/wireguard-go/wgcfg"
@ -574,6 +576,11 @@ func (c *Direct) PollNetMap(ctx context.Context, maxPolls int, cb func(*NetworkM
res, err := c.httpc.Do(req)
if err != nil {
// Temproary (2020-10-29) issue 839 debugging:
if runtime.GOOS == "darwin" && (errors.Is(err, syscall.EADDRNOTAVAIL) || strings.Contains(err.Error(), "can't assign requested address")) {
vlogf = c.logf
debugAddrNotAvailalable(vlogf)
}
vlogf("netmap: Do: %v", err)
return err
}
@ -1051,3 +1058,35 @@ func TrimWGConfig() opt.Bool {
v, _ := controlTrimWGConfig.Load().(opt.Bool)
return v
}
// Temproary (2020-10-29) debugging for https://github.com/tailscale/tailscale/issues/839
func debugAddrNotAvailalable(logf logger.Logf) {
logf("EADDRNOTAVAIL-debug: [unexpected] got EADDRNOTAVAIL on " + runtime.GOOS)
var d net.Dialer
d.Timeout = 5 * time.Second
var c [2]net.Conn
var a [2]*net.TCPAddr
for i := range c {
var err error
c[i], err = d.Dial("tcp", "login.tailscale.com:80")
if err != nil {
logf("EADDRNOTAVAIL-debug: failed to debug dial tailscale %d/%d: %v", i+1, len(c), err)
return
}
defer c[i].Close()
a[i] = c[i].LocalAddr().(*net.TCPAddr)
}
if a[0].Port == a[1].Port {
logf("EADDRNOTAVAIL-debug: two trial connections had same source port")
return
}
for i := range c {
_, err := io.WriteString(c[i], "HEAD / HTTP/1.0\r\n\r\n")
if err != nil {
logf("EADDRNOTAVAIL-debug: failed to write on connection %d post-dial: %v", i+1, err)
return
}
}
logf("EADDRNOTAVAIL-debug: dial+writes normal")
}