The “Hello Cloud” walk-through for Project Kenai gives an example of how “examining the virtual data center” with the Sun Cloud API would show rules on a VM firewall

  "vms": [
    {
      "name" : "Firewall"
      "uri": "/vdc/m~FW01",
      "run_status" : "HALTED",
      "description" : "Firewall appliance; ports 80 and 22 open.",
      "hostname" : "FW01",
      "os" : "Solaris 10",
      "cpu" : 1800,
      "memory" : 2,
      "boot_disk" : 10,
      "data_disk" : 80,
      "temp_disk" : 10,
      "params" : { },
      "tags" : [ ],
      "back_up": "/vdc/m~FW01/ops/back-up",
      "attach": "/vdc/m~FW01/ops/attach",
      "detach": "/vdc/m~FW01/ops/detach",
      "backups" : [ ],
      "interfaces" : [
        {
          "mac_address": "00:16:3E:08:00:91",
          "ip_address": "144.34.100.199",
          "public_address": "/addresses/144.34.100.199",
          "nic": "eth0"
        },
        {
          "vnet": "/vnets/10.31.145.0",
          "mac_address": "00:16:3E:08:00:92",
          "ip_address": "10.31.145.254",
          "nic": "eth1"
        }
      ]
      "controllers": {
        "start": "/vdc/m~FW01/ops/start",
      }
    }
  ]