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cmd/tailscale/cli: add ping subcommand

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For example:

$ tailscale ping -h
USAGE
  ping <hostname-or-IP>

FLAGS
  -c 10                   max number of pings to send
  -stop-once-direct true  stop once a direct path is established
  -verbose false          verbose output

$ tailscale ping mon.ts.tailscale.com
pong from monitoring (100.88.178.64) via DERP(sfo) in 65ms
pong from monitoring (100.88.178.64) via DERP(sfo) in 252ms
pong from monitoring (100.88.178.64) via [2604:a880:2:d1::36:d001]:41641 in 33ms

Fixes #661

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2020-08-09 14:49:42 -07:00
committed by Brad Fitzpatrick
parent d65e2632ab
commit 84dc891843
11 changed files with 379 additions and 40 deletions
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4
wgengine/userspace.go
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@ -1157,6 +1157,10 @@ func (e *userspaceEngine) UpdateStatus(sb *ipnstate.StatusBuilder) {
e.magicConn.UpdateStatus(sb)
}
func (e *userspaceEngine) Ping(ip netaddr.IP, cb func(*ipnstate.PingResult)) {
e.magicConn.Ping(ip, cb)
}
// diagnoseTUNFailure is called if tun.CreateTUN fails, to poke around
// the system and log some diagnostic info that might help debug why
// TUN failed. Because TUN's already failed and things the program's