Adapted to Fisher 4.x plugin style

fish/theme-t31m/functions/ssm_tunnel.fish

@@ -0,0 +1,38 @@
+function ssm_tunnel --description 'access private AWS ressources via Bastion Host'
+
+    if test (count $argv) -lt 2
+        echo "Provide an Host:Port Mapping & an Local Port"
+        return
+    end
+
+    # Get bastion host ID using it's name
+    set INSTANCE_ID (aws ec2 describe-instances \
+            --filter 'Name=tag:Name,Values=ops-infrastructure-bastion'\
+            --query "Reservations[].Instances[?State.Name == 'running'].InstanceId[]"\
+            --output text)
+    
+    # AWS Remote host i.e elastic.aws.com:80
+    set REMOTE_HOST $argv[1]
+
+    # Ports to bind for forwarding
+    set LOCAL_PORT $argv[2]
+    set REM_PORT (math (random) % 65535 + 2000)
+    set TIMEOUT 21600 #seconds until forwarding session times out (48h max)
+
+    # make sure jq is installed
+    # Start socat on the remote server
+    set CMD "'sudo socat TCP4-LISTEN:$REM_PORT,fork TCP4:$REMOTE_HOST'"
+    set CMD_INVOC_ID (aws ssm send-command --instance-ids $INSTANCE_ID \
+    --document-name 'AWS-RunShellScript' \
+    --parameters "commands=$CMD,executionTimeout=$TIMEOUT" --output json | jq -r '.Command.CommandId')
+    
+    # Start tunnel session
+    echo "Starting Tunnel"
+    aws ssm start-session --target $INSTANCE_ID \
+    --document-name "AWS-StartPortForwardingSession" \
+    --parameters "portNumber=$REM_PORT,localPortNumber=$LOCAL_PORT"
+
+    # stop socat on the bastion
+    aws ssm cancel-command --command-id $CMD_INVOC_ID
+    echo "Command Cancelled Successfully."
+end