Healthcheck

Goauld server healthcheck

To ensure tunnels are functioning correctly, some healthcheck scripts/tools are provided.

Warning

The provided healthchecks only verify that the SSHD server is reachable through the tunnel by checking the SSHD banner.

SSH over TLS

echo "00000000000000000000000000000000\n" | timeout 1 openssl  s_client -quiet -connect $TLS_DOMAIN$:$TLS_PORT$ 2>/dev/null | grep -q "SSH-2.0-"

SSH over WebSocket

Building

go build -o ws-healthcheck ./healthcheck/websocket

Running

{ echo "" ; sleep 1; } | ws-healthcheck  "wss://$WS_DOMAIN/wssh/00000000000000000000000000000000" 2>/dev/null

SSH over DNS

Building

go build -o dns-healthcheck ./healthcheck/dns/dnstt-client

Running

{ echo "00000000000000000000000000000000S" ; sleep 1; } | dns-healthcheck -udp "$DNS_SERVER:$DNS_SERVER_PORT" "$DNS_DOMAIN" 2>/dev/null | grep -q "SSH-2.0-"

Note

The “S” is required at the end of the echo