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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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18
ipn/ipnstate/ipnstate.go
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@@ -322,3 +322,21 @@ func osEmoji(os string) string {
}
return "👽"
}
// PingResult contains response information for the "tailscale ping" subcommand,
// saying how Tailscale can reach a Tailscale IP or subnet-routed IP.
type PingResult struct {
IP string // ping destination
NodeIP string // Tailscale IP of node handling IP (different for subnet routers)
NodeName string // DNS name base or (possibly not unique) hostname
Err string
LatencySeconds float64
Endpoint string // ip:port if direct UDP was used
DERPRegionID int // non-zero if DERP was used
DERPRegionCode string // three-letter airport/region code if DERP was used
// TODO(bradfitz): details like whether port mapping was used on either side? (Once supported)
}